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8483 lines
269 KiB
C
8483 lines
269 KiB
C
/*
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* SSLv3/TLSv1 shared functions
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: GPL-2.0
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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/*
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* The SSL 3.0 specification was drafted by Netscape in 1996,
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* and became an IETF standard in 1999.
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*
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* http://wp.netscape.com/eng/ssl3/
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* http://www.ietf.org/rfc/rfc2246.txt
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* http://www.ietf.org/rfc/rfc4346.txt
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_SSL_TLS_C)
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdlib.h>
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#define mbedtls_calloc calloc
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#define mbedtls_free free
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#endif
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#include "mbedtls/debug.h"
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#include "mbedtls/ssl.h"
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#include "mbedtls/ssl_internal.h"
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#include <string.h>
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#if defined(MBEDTLS_X509_CRT_PARSE_C)
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#include "mbedtls/oid.h"
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#endif
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/* Implementation that should never be optimized out by the compiler */
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static void mbedtls_zeroize( void *v, size_t n ) {
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volatile unsigned char *p = v; while( n-- ) *p++ = 0;
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}
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/* Length of the "epoch" field in the record header */
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static inline size_t ssl_ep_len( const mbedtls_ssl_context *ssl )
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{
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#if defined(MBEDTLS_SSL_PROTO_DTLS)
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if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
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return( 2 );
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#else
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((void) ssl);
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#endif
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return( 0 );
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}
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/*
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* Start a timer.
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* Passing millisecs = 0 cancels a running timer.
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*/
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static void ssl_set_timer( mbedtls_ssl_context *ssl, uint32_t millisecs )
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{
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if( ssl->f_set_timer == NULL )
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return;
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MBEDTLS_SSL_DEBUG_MSG( 3, ( "set_timer to %d ms", (int) millisecs ) );
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ssl->f_set_timer( ssl->p_timer, millisecs / 4, millisecs );
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}
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/*
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* Return -1 is timer is expired, 0 if it isn't.
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*/
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static int ssl_check_timer( mbedtls_ssl_context *ssl )
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{
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if( ssl->f_get_timer == NULL )
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return( 0 );
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if( ssl->f_get_timer( ssl->p_timer ) == 2 )
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{
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MBEDTLS_SSL_DEBUG_MSG( 3, ( "timer expired" ) );
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return( -1 );
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}
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return( 0 );
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}
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#if defined(MBEDTLS_SSL_PROTO_DTLS)
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/*
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* Double the retransmit timeout value, within the allowed range,
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* returning -1 if the maximum value has already been reached.
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*/
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static int ssl_double_retransmit_timeout( mbedtls_ssl_context *ssl )
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{
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uint32_t new_timeout;
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if( ssl->handshake->retransmit_timeout >= ssl->conf->hs_timeout_max )
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return( -1 );
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new_timeout = 2 * ssl->handshake->retransmit_timeout;
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/* Avoid arithmetic overflow and range overflow */
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if( new_timeout < ssl->handshake->retransmit_timeout ||
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new_timeout > ssl->conf->hs_timeout_max )
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{
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new_timeout = ssl->conf->hs_timeout_max;
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}
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ssl->handshake->retransmit_timeout = new_timeout;
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MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs",
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ssl->handshake->retransmit_timeout ) );
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return( 0 );
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}
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static void ssl_reset_retransmit_timeout( mbedtls_ssl_context *ssl )
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{
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ssl->handshake->retransmit_timeout = ssl->conf->hs_timeout_min;
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MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs",
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ssl->handshake->retransmit_timeout ) );
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}
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#endif /* MBEDTLS_SSL_PROTO_DTLS */
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#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
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/*
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* Convert max_fragment_length codes to length.
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* RFC 6066 says:
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* enum{
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* 2^9(1), 2^10(2), 2^11(3), 2^12(4), (255)
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* } MaxFragmentLength;
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* and we add 0 -> extension unused
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*/
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static unsigned int mfl_code_to_length[MBEDTLS_SSL_MAX_FRAG_LEN_INVALID] =
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{
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MBEDTLS_SSL_MAX_CONTENT_LEN, /* MBEDTLS_SSL_MAX_FRAG_LEN_NONE */
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512, /* MBEDTLS_SSL_MAX_FRAG_LEN_512 */
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1024, /* MBEDTLS_SSL_MAX_FRAG_LEN_1024 */
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2048, /* MBEDTLS_SSL_MAX_FRAG_LEN_2048 */
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4096, /* MBEDTLS_SSL_MAX_FRAG_LEN_4096 */
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};
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#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
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#if defined(MBEDTLS_SSL_CLI_C)
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static int ssl_session_copy( mbedtls_ssl_session *dst, const mbedtls_ssl_session *src )
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{
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mbedtls_ssl_session_free( dst );
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memcpy( dst, src, sizeof( mbedtls_ssl_session ) );
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#if defined(MBEDTLS_X509_CRT_PARSE_C)
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if( src->peer_cert != NULL )
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{
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int ret;
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dst->peer_cert = mbedtls_calloc( 1, sizeof(mbedtls_x509_crt) );
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if( dst->peer_cert == NULL )
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return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
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mbedtls_x509_crt_init( dst->peer_cert );
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if( ( ret = mbedtls_x509_crt_parse_der( dst->peer_cert, src->peer_cert->raw.p,
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src->peer_cert->raw.len ) ) != 0 )
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{
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mbedtls_free( dst->peer_cert );
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dst->peer_cert = NULL;
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return( ret );
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}
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}
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#endif /* MBEDTLS_X509_CRT_PARSE_C */
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#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
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if( src->ticket != NULL )
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{
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dst->ticket = mbedtls_calloc( 1, src->ticket_len );
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if( dst->ticket == NULL )
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return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
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memcpy( dst->ticket, src->ticket, src->ticket_len );
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}
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#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
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return( 0 );
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}
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#endif /* MBEDTLS_SSL_CLI_C */
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#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
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int (*mbedtls_ssl_hw_record_init)( mbedtls_ssl_context *ssl,
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const unsigned char *key_enc, const unsigned char *key_dec,
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size_t keylen,
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const unsigned char *iv_enc, const unsigned char *iv_dec,
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size_t ivlen,
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const unsigned char *mac_enc, const unsigned char *mac_dec,
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size_t maclen ) = NULL;
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int (*mbedtls_ssl_hw_record_activate)( mbedtls_ssl_context *ssl, int direction) = NULL;
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int (*mbedtls_ssl_hw_record_reset)( mbedtls_ssl_context *ssl ) = NULL;
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int (*mbedtls_ssl_hw_record_write)( mbedtls_ssl_context *ssl ) = NULL;
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int (*mbedtls_ssl_hw_record_read)( mbedtls_ssl_context *ssl ) = NULL;
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int (*mbedtls_ssl_hw_record_finish)( mbedtls_ssl_context *ssl ) = NULL;
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#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
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/*
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* Key material generation
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*/
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#if defined(MBEDTLS_SSL_PROTO_SSL3)
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static int ssl3_prf( const unsigned char *secret, size_t slen,
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const char *label,
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const unsigned char *random, size_t rlen,
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unsigned char *dstbuf, size_t dlen )
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{
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int ret = 0;
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size_t i;
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mbedtls_md5_context md5;
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mbedtls_sha1_context sha1;
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unsigned char padding[16];
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unsigned char sha1sum[20];
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((void)label);
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mbedtls_md5_init( &md5 );
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mbedtls_sha1_init( &sha1 );
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/*
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* SSLv3:
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* block =
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* MD5( secret + SHA1( 'A' + secret + random ) ) +
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* MD5( secret + SHA1( 'BB' + secret + random ) ) +
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* MD5( secret + SHA1( 'CCC' + secret + random ) ) +
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* ...
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*/
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for( i = 0; i < dlen / 16; i++ )
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{
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memset( padding, (unsigned char) ('A' + i), 1 + i );
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if( ( ret = mbedtls_sha1_starts_ret( &sha1 ) ) != 0 )
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goto exit;
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if( ( ret = mbedtls_sha1_update_ret( &sha1, padding, 1 + i ) ) != 0 )
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goto exit;
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if( ( ret = mbedtls_sha1_update_ret( &sha1, secret, slen ) ) != 0 )
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goto exit;
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if( ( ret = mbedtls_sha1_update_ret( &sha1, random, rlen ) ) != 0 )
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goto exit;
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if( ( ret = mbedtls_sha1_finish_ret( &sha1, sha1sum ) ) != 0 )
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goto exit;
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if( ( ret = mbedtls_md5_starts_ret( &md5 ) ) != 0 )
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goto exit;
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if( ( ret = mbedtls_md5_update_ret( &md5, secret, slen ) ) != 0 )
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goto exit;
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if( ( ret = mbedtls_md5_update_ret( &md5, sha1sum, 20 ) ) != 0 )
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goto exit;
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if( ( ret = mbedtls_md5_finish_ret( &md5, dstbuf + i * 16 ) ) != 0 )
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goto exit;
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}
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exit:
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mbedtls_md5_free( &md5 );
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mbedtls_sha1_free( &sha1 );
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mbedtls_zeroize( padding, sizeof( padding ) );
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mbedtls_zeroize( sha1sum, sizeof( sha1sum ) );
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return( ret );
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}
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#endif /* MBEDTLS_SSL_PROTO_SSL3 */
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#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
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static int tls1_prf( const unsigned char *secret, size_t slen,
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const char *label,
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const unsigned char *random, size_t rlen,
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unsigned char *dstbuf, size_t dlen )
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{
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size_t nb, hs;
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size_t i, j, k;
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const unsigned char *S1, *S2;
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unsigned char tmp[128];
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unsigned char h_i[20];
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const mbedtls_md_info_t *md_info;
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mbedtls_md_context_t md_ctx;
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int ret;
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mbedtls_md_init( &md_ctx );
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if( sizeof( tmp ) < 20 + strlen( label ) + rlen )
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return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
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hs = ( slen + 1 ) / 2;
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S1 = secret;
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S2 = secret + slen - hs;
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nb = strlen( label );
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memcpy( tmp + 20, label, nb );
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memcpy( tmp + 20 + nb, random, rlen );
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nb += rlen;
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/*
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* First compute P_md5(secret,label+random)[0..dlen]
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*/
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if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_MD5 ) ) == NULL )
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return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
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if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
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return( ret );
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mbedtls_md_hmac_starts( &md_ctx, S1, hs );
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mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb );
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mbedtls_md_hmac_finish( &md_ctx, 4 + tmp );
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for( i = 0; i < dlen; i += 16 )
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{
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mbedtls_md_hmac_reset ( &md_ctx );
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mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 + nb );
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mbedtls_md_hmac_finish( &md_ctx, h_i );
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mbedtls_md_hmac_reset ( &md_ctx );
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mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 );
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mbedtls_md_hmac_finish( &md_ctx, 4 + tmp );
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k = ( i + 16 > dlen ) ? dlen % 16 : 16;
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for( j = 0; j < k; j++ )
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dstbuf[i + j] = h_i[j];
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}
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mbedtls_md_free( &md_ctx );
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/*
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* XOR out with P_sha1(secret,label+random)[0..dlen]
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*/
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if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 ) ) == NULL )
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return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
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if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
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return( ret );
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mbedtls_md_hmac_starts( &md_ctx, S2, hs );
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mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb );
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mbedtls_md_hmac_finish( &md_ctx, tmp );
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for( i = 0; i < dlen; i += 20 )
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{
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mbedtls_md_hmac_reset ( &md_ctx );
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mbedtls_md_hmac_update( &md_ctx, tmp, 20 + nb );
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mbedtls_md_hmac_finish( &md_ctx, h_i );
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mbedtls_md_hmac_reset ( &md_ctx );
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mbedtls_md_hmac_update( &md_ctx, tmp, 20 );
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mbedtls_md_hmac_finish( &md_ctx, tmp );
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k = ( i + 20 > dlen ) ? dlen % 20 : 20;
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for( j = 0; j < k; j++ )
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dstbuf[i + j] = (unsigned char)( dstbuf[i + j] ^ h_i[j] );
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}
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mbedtls_md_free( &md_ctx );
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mbedtls_zeroize( tmp, sizeof( tmp ) );
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mbedtls_zeroize( h_i, sizeof( h_i ) );
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return( 0 );
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}
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#endif /* MBEDTLS_SSL_PROTO_TLS1) || MBEDTLS_SSL_PROTO_TLS1_1 */
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#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
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static int tls_prf_generic( mbedtls_md_type_t md_type,
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const unsigned char *secret, size_t slen,
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const char *label,
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const unsigned char *random, size_t rlen,
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unsigned char *dstbuf, size_t dlen )
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{
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size_t nb;
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size_t i, j, k, md_len;
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unsigned char tmp[128];
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unsigned char h_i[MBEDTLS_MD_MAX_SIZE];
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const mbedtls_md_info_t *md_info;
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mbedtls_md_context_t md_ctx;
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int ret;
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mbedtls_md_init( &md_ctx );
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if( ( md_info = mbedtls_md_info_from_type( md_type ) ) == NULL )
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return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
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md_len = mbedtls_md_get_size( md_info );
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if( sizeof( tmp ) < md_len + strlen( label ) + rlen )
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return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
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nb = strlen( label );
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memcpy( tmp + md_len, label, nb );
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memcpy( tmp + md_len + nb, random, rlen );
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nb += rlen;
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/*
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* Compute P_<hash>(secret, label + random)[0..dlen]
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*/
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if ( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
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return( ret );
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mbedtls_md_hmac_starts( &md_ctx, secret, slen );
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mbedtls_md_hmac_update( &md_ctx, tmp + md_len, nb );
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mbedtls_md_hmac_finish( &md_ctx, tmp );
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for( i = 0; i < dlen; i += md_len )
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{
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mbedtls_md_hmac_reset ( &md_ctx );
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mbedtls_md_hmac_update( &md_ctx, tmp, md_len + nb );
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mbedtls_md_hmac_finish( &md_ctx, h_i );
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mbedtls_md_hmac_reset ( &md_ctx );
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mbedtls_md_hmac_update( &md_ctx, tmp, md_len );
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mbedtls_md_hmac_finish( &md_ctx, tmp );
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k = ( i + md_len > dlen ) ? dlen % md_len : md_len;
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for( j = 0; j < k; j++ )
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dstbuf[i + j] = h_i[j];
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}
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mbedtls_md_free( &md_ctx );
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mbedtls_zeroize( tmp, sizeof( tmp ) );
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mbedtls_zeroize( h_i, sizeof( h_i ) );
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return( 0 );
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}
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|
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#if defined(MBEDTLS_SHA256_C)
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static int tls_prf_sha256( const unsigned char *secret, size_t slen,
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const char *label,
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const unsigned char *random, size_t rlen,
|
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unsigned char *dstbuf, size_t dlen )
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{
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return( tls_prf_generic( MBEDTLS_MD_SHA256, secret, slen,
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label, random, rlen, dstbuf, dlen ) );
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}
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#endif /* MBEDTLS_SHA256_C */
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|
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#if defined(MBEDTLS_SHA512_C)
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static int tls_prf_sha384( const unsigned char *secret, size_t slen,
|
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const char *label,
|
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const unsigned char *random, size_t rlen,
|
|
unsigned char *dstbuf, size_t dlen )
|
|
{
|
|
return( tls_prf_generic( MBEDTLS_MD_SHA384, secret, slen,
|
|
label, random, rlen, dstbuf, dlen ) );
|
|
}
|
|
#endif /* MBEDTLS_SHA512_C */
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
|
|
static void ssl_update_checksum_start( mbedtls_ssl_context *, const unsigned char *, size_t );
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_1)
|
|
static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *, const unsigned char *, size_t );
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
static void ssl_calc_verify_ssl( mbedtls_ssl_context *, unsigned char * );
|
|
static void ssl_calc_finished_ssl( mbedtls_ssl_context *, unsigned char *, int );
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
|
|
static void ssl_calc_verify_tls( mbedtls_ssl_context *, unsigned char * );
|
|
static void ssl_calc_finished_tls( mbedtls_ssl_context *, unsigned char *, int );
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
static void ssl_update_checksum_sha256( mbedtls_ssl_context *, const unsigned char *, size_t );
|
|
static void ssl_calc_verify_tls_sha256( mbedtls_ssl_context *,unsigned char * );
|
|
static void ssl_calc_finished_tls_sha256( mbedtls_ssl_context *,unsigned char *, int );
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
static void ssl_update_checksum_sha384( mbedtls_ssl_context *, const unsigned char *, size_t );
|
|
static void ssl_calc_verify_tls_sha384( mbedtls_ssl_context *, unsigned char * );
|
|
static void ssl_calc_finished_tls_sha384( mbedtls_ssl_context *, unsigned char *, int );
|
|
#endif
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
|
|
int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = 0;
|
|
unsigned char tmp[64];
|
|
unsigned char keyblk[256];
|
|
unsigned char *key1;
|
|
unsigned char *key2;
|
|
unsigned char *mac_enc;
|
|
unsigned char *mac_dec;
|
|
size_t mac_key_len;
|
|
size_t iv_copy_len;
|
|
const mbedtls_cipher_info_t *cipher_info;
|
|
const mbedtls_md_info_t *md_info;
|
|
|
|
mbedtls_ssl_session *session = ssl->session_negotiate;
|
|
mbedtls_ssl_transform *transform = ssl->transform_negotiate;
|
|
mbedtls_ssl_handshake_params *handshake = ssl->handshake;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> derive keys" ) );
|
|
|
|
cipher_info = mbedtls_cipher_info_from_type( transform->ciphersuite_info->cipher );
|
|
if( cipher_info == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "cipher info for %d not found",
|
|
transform->ciphersuite_info->cipher ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
md_info = mbedtls_md_info_from_type( transform->ciphersuite_info->mac );
|
|
if( md_info == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "mbedtls_md info for %d not found",
|
|
transform->ciphersuite_info->mac ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
/*
|
|
* Set appropriate PRF function and other SSL / TLS / TLS1.2 functions
|
|
*/
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
|
|
{
|
|
handshake->tls_prf = ssl3_prf;
|
|
handshake->calc_verify = ssl_calc_verify_ssl;
|
|
handshake->calc_finished = ssl_calc_finished_ssl;
|
|
}
|
|
else
|
|
#endif
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
|
|
if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 )
|
|
{
|
|
handshake->tls_prf = tls1_prf;
|
|
handshake->calc_verify = ssl_calc_verify_tls;
|
|
handshake->calc_finished = ssl_calc_finished_tls;
|
|
}
|
|
else
|
|
#endif
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 &&
|
|
transform->ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
|
|
{
|
|
handshake->tls_prf = tls_prf_sha384;
|
|
handshake->calc_verify = ssl_calc_verify_tls_sha384;
|
|
handshake->calc_finished = ssl_calc_finished_tls_sha384;
|
|
}
|
|
else
|
|
#endif
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
|
|
{
|
|
handshake->tls_prf = tls_prf_sha256;
|
|
handshake->calc_verify = ssl_calc_verify_tls_sha256;
|
|
handshake->calc_finished = ssl_calc_finished_tls_sha256;
|
|
}
|
|
else
|
|
#endif
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
/*
|
|
* SSLv3:
|
|
* master =
|
|
* MD5( premaster + SHA1( 'A' + premaster + randbytes ) ) +
|
|
* MD5( premaster + SHA1( 'BB' + premaster + randbytes ) ) +
|
|
* MD5( premaster + SHA1( 'CCC' + premaster + randbytes ) )
|
|
*
|
|
* TLSv1+:
|
|
* master = PRF( premaster, "master secret", randbytes )[0..47]
|
|
*/
|
|
if( handshake->resume == 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "premaster secret", handshake->premaster,
|
|
handshake->pmslen );
|
|
|
|
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
|
|
if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED )
|
|
{
|
|
unsigned char session_hash[48];
|
|
size_t hash_len;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "using extended master secret" ) );
|
|
|
|
ssl->handshake->calc_verify( ssl, session_hash );
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
|
|
{
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
if( ssl->transform_negotiate->ciphersuite_info->mac ==
|
|
MBEDTLS_MD_SHA384 )
|
|
{
|
|
hash_len = 48;
|
|
}
|
|
else
|
|
#endif
|
|
hash_len = 32;
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
hash_len = 36;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "session hash", session_hash, hash_len );
|
|
|
|
ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
|
|
"extended master secret",
|
|
session_hash, hash_len,
|
|
session->master, 48 );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
|
|
return( ret );
|
|
}
|
|
|
|
}
|
|
else
|
|
#endif
|
|
ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
|
|
"master secret",
|
|
handshake->randbytes, 64,
|
|
session->master, 48 );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
|
|
return( ret );
|
|
}
|
|
|
|
mbedtls_zeroize( handshake->premaster, sizeof(handshake->premaster) );
|
|
}
|
|
else
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "no premaster (session resumed)" ) );
|
|
|
|
/*
|
|
* Swap the client and server random values.
|
|
*/
|
|
memcpy( tmp, handshake->randbytes, 64 );
|
|
memcpy( handshake->randbytes, tmp + 32, 32 );
|
|
memcpy( handshake->randbytes + 32, tmp, 32 );
|
|
mbedtls_zeroize( tmp, sizeof( tmp ) );
|
|
|
|
/*
|
|
* SSLv3:
|
|
* key block =
|
|
* MD5( master + SHA1( 'A' + master + randbytes ) ) +
|
|
* MD5( master + SHA1( 'BB' + master + randbytes ) ) +
|
|
* MD5( master + SHA1( 'CCC' + master + randbytes ) ) +
|
|
* MD5( master + SHA1( 'DDDD' + master + randbytes ) ) +
|
|
* ...
|
|
*
|
|
* TLSv1:
|
|
* key block = PRF( master, "key expansion", randbytes )
|
|
*/
|
|
ret = handshake->tls_prf( session->master, 48, "key expansion",
|
|
handshake->randbytes, 64, keyblk, 256 );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
|
|
return( ret );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite = %s",
|
|
mbedtls_ssl_get_ciphersuite_name( session->ciphersuite ) ) );
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "master secret", session->master, 48 );
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "random bytes", handshake->randbytes, 64 );
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "key block", keyblk, 256 );
|
|
|
|
mbedtls_zeroize( handshake->randbytes, sizeof( handshake->randbytes ) );
|
|
|
|
/*
|
|
* Determine the appropriate key, IV and MAC length.
|
|
*/
|
|
|
|
transform->keylen = cipher_info->key_bitlen / 8;
|
|
|
|
if( cipher_info->mode == MBEDTLS_MODE_GCM ||
|
|
cipher_info->mode == MBEDTLS_MODE_CCM )
|
|
{
|
|
transform->maclen = 0;
|
|
mac_key_len = 0;
|
|
|
|
transform->ivlen = 12;
|
|
transform->fixed_ivlen = 4;
|
|
|
|
/* Minimum length is expicit IV + tag */
|
|
transform->minlen = transform->ivlen - transform->fixed_ivlen
|
|
+ ( transform->ciphersuite_info->flags &
|
|
MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16 );
|
|
}
|
|
else
|
|
{
|
|
/* Initialize HMAC contexts */
|
|
if( ( ret = mbedtls_md_setup( &transform->md_ctx_enc, md_info, 1 ) ) != 0 ||
|
|
( ret = mbedtls_md_setup( &transform->md_ctx_dec, md_info, 1 ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret );
|
|
return( ret );
|
|
}
|
|
|
|
/* Get MAC length */
|
|
mac_key_len = mbedtls_md_get_size( md_info );
|
|
transform->maclen = mac_key_len;
|
|
|
|
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
|
|
/*
|
|
* If HMAC is to be truncated, we shall keep the leftmost bytes,
|
|
* (rfc 6066 page 13 or rfc 2104 section 4),
|
|
* so we only need to adjust the length here.
|
|
*/
|
|
if( session->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED )
|
|
{
|
|
transform->maclen = MBEDTLS_SSL_TRUNCATED_HMAC_LEN;
|
|
|
|
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT)
|
|
/* Fall back to old, non-compliant version of the truncated
|
|
* HMAC implementation which also truncates the key
|
|
* (Mbed TLS versions from 1.3 to 2.6.0) */
|
|
mac_key_len = transform->maclen;
|
|
#endif
|
|
}
|
|
#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
|
|
|
|
/* IV length */
|
|
transform->ivlen = cipher_info->iv_size;
|
|
|
|
/* Minimum length */
|
|
if( cipher_info->mode == MBEDTLS_MODE_STREAM )
|
|
transform->minlen = transform->maclen;
|
|
else
|
|
{
|
|
/*
|
|
* GenericBlockCipher:
|
|
* 1. if EtM is in use: one block plus MAC
|
|
* otherwise: * first multiple of blocklen greater than maclen
|
|
* 2. IV except for SSL3 and TLS 1.0
|
|
*/
|
|
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
|
|
if( session->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED )
|
|
{
|
|
transform->minlen = transform->maclen
|
|
+ cipher_info->block_size;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
transform->minlen = transform->maclen
|
|
+ cipher_info->block_size
|
|
- transform->maclen % cipher_info->block_size;
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ||
|
|
ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_1 )
|
|
; /* No need to adjust minlen */
|
|
else
|
|
#endif
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_2 ||
|
|
ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
|
|
{
|
|
transform->minlen += transform->ivlen;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
}
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "keylen: %d, minlen: %d, ivlen: %d, maclen: %d",
|
|
transform->keylen, transform->minlen, transform->ivlen,
|
|
transform->maclen ) );
|
|
|
|
/*
|
|
* Finally setup the cipher contexts, IVs and MAC secrets.
|
|
*/
|
|
#if defined(MBEDTLS_SSL_CLI_C)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
|
|
{
|
|
key1 = keyblk + mac_key_len * 2;
|
|
key2 = keyblk + mac_key_len * 2 + transform->keylen;
|
|
|
|
mac_enc = keyblk;
|
|
mac_dec = keyblk + mac_key_len;
|
|
|
|
/*
|
|
* This is not used in TLS v1.1.
|
|
*/
|
|
iv_copy_len = ( transform->fixed_ivlen ) ?
|
|
transform->fixed_ivlen : transform->ivlen;
|
|
memcpy( transform->iv_enc, key2 + transform->keylen, iv_copy_len );
|
|
memcpy( transform->iv_dec, key2 + transform->keylen + iv_copy_len,
|
|
iv_copy_len );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_CLI_C */
|
|
#if defined(MBEDTLS_SSL_SRV_C)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
|
|
{
|
|
key1 = keyblk + mac_key_len * 2 + transform->keylen;
|
|
key2 = keyblk + mac_key_len * 2;
|
|
|
|
mac_enc = keyblk + mac_key_len;
|
|
mac_dec = keyblk;
|
|
|
|
/*
|
|
* This is not used in TLS v1.1.
|
|
*/
|
|
iv_copy_len = ( transform->fixed_ivlen ) ?
|
|
transform->fixed_ivlen : transform->ivlen;
|
|
memcpy( transform->iv_dec, key1 + transform->keylen, iv_copy_len );
|
|
memcpy( transform->iv_enc, key1 + transform->keylen + iv_copy_len,
|
|
iv_copy_len );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_SRV_C */
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
|
|
{
|
|
if( mac_key_len > sizeof transform->mac_enc )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
memcpy( transform->mac_enc, mac_enc, mac_key_len );
|
|
memcpy( transform->mac_dec, mac_dec, mac_key_len );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_PROTO_SSL3 */
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
|
|
{
|
|
/* For HMAC-based ciphersuites, initialize the HMAC transforms.
|
|
For AEAD-based ciphersuites, there is nothing to do here. */
|
|
if( mac_key_len != 0 )
|
|
{
|
|
mbedtls_md_hmac_starts( &transform->md_ctx_enc, mac_enc, mac_key_len );
|
|
mbedtls_md_hmac_starts( &transform->md_ctx_dec, mac_dec, mac_key_len );
|
|
}
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
|
|
if( mbedtls_ssl_hw_record_init != NULL )
|
|
{
|
|
int ret = 0;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_init()" ) );
|
|
|
|
if( ( ret = mbedtls_ssl_hw_record_init( ssl, key1, key2, transform->keylen,
|
|
transform->iv_enc, transform->iv_dec,
|
|
iv_copy_len,
|
|
mac_enc, mac_dec,
|
|
mac_key_len ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_init", ret );
|
|
return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
|
|
|
|
#if defined(MBEDTLS_SSL_EXPORT_KEYS)
|
|
if( ssl->conf->f_export_keys != NULL )
|
|
{
|
|
ssl->conf->f_export_keys( ssl->conf->p_export_keys,
|
|
session->master, keyblk,
|
|
mac_key_len, transform->keylen,
|
|
iv_copy_len );
|
|
}
|
|
#endif
|
|
|
|
if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_enc,
|
|
cipher_info ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_dec,
|
|
cipher_info ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_enc, key1,
|
|
cipher_info->key_bitlen,
|
|
MBEDTLS_ENCRYPT ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_dec, key2,
|
|
cipher_info->key_bitlen,
|
|
MBEDTLS_DECRYPT ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret );
|
|
return( ret );
|
|
}
|
|
|
|
#if defined(MBEDTLS_CIPHER_MODE_CBC)
|
|
if( cipher_info->mode == MBEDTLS_MODE_CBC )
|
|
{
|
|
if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_enc,
|
|
MBEDTLS_PADDING_NONE ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_dec,
|
|
MBEDTLS_PADDING_NONE ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_CIPHER_MODE_CBC */
|
|
|
|
mbedtls_zeroize( keyblk, sizeof( keyblk ) );
|
|
|
|
#if defined(MBEDTLS_ZLIB_SUPPORT)
|
|
// Initialize compression
|
|
//
|
|
if( session->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
|
|
{
|
|
if( ssl->compress_buf == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "Allocating compression buffer" ) );
|
|
ssl->compress_buf = mbedtls_calloc( 1, MBEDTLS_SSL_BUFFER_LEN );
|
|
if( ssl->compress_buf == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed",
|
|
MBEDTLS_SSL_BUFFER_LEN ) );
|
|
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
|
|
}
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "Initializing zlib states" ) );
|
|
|
|
memset( &transform->ctx_deflate, 0, sizeof( transform->ctx_deflate ) );
|
|
memset( &transform->ctx_inflate, 0, sizeof( transform->ctx_inflate ) );
|
|
|
|
if( deflateInit( &transform->ctx_deflate,
|
|
Z_DEFAULT_COMPRESSION ) != Z_OK ||
|
|
inflateInit( &transform->ctx_inflate ) != Z_OK )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to initialize compression" ) );
|
|
return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_ZLIB_SUPPORT */
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= derive keys" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
void ssl_calc_verify_ssl( mbedtls_ssl_context *ssl, unsigned char hash[36] )
|
|
{
|
|
mbedtls_md5_context md5;
|
|
mbedtls_sha1_context sha1;
|
|
unsigned char pad_1[48];
|
|
unsigned char pad_2[48];
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify ssl" ) );
|
|
|
|
mbedtls_md5_init( &md5 );
|
|
mbedtls_sha1_init( &sha1 );
|
|
|
|
mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
|
|
mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
|
|
|
|
memset( pad_1, 0x36, 48 );
|
|
memset( pad_2, 0x5C, 48 );
|
|
|
|
mbedtls_md5_update_ret( &md5, ssl->session_negotiate->master, 48 );
|
|
mbedtls_md5_update_ret( &md5, pad_1, 48 );
|
|
mbedtls_md5_finish_ret( &md5, hash );
|
|
|
|
mbedtls_md5_starts_ret( &md5 );
|
|
mbedtls_md5_update_ret( &md5, ssl->session_negotiate->master, 48 );
|
|
mbedtls_md5_update_ret( &md5, pad_2, 48 );
|
|
mbedtls_md5_update_ret( &md5, hash, 16 );
|
|
mbedtls_md5_finish_ret( &md5, hash );
|
|
|
|
mbedtls_sha1_update_ret( &sha1, ssl->session_negotiate->master, 48 );
|
|
mbedtls_sha1_update_ret( &sha1, pad_1, 40 );
|
|
mbedtls_sha1_finish_ret( &sha1, hash + 16 );
|
|
|
|
mbedtls_sha1_starts_ret( &sha1 );
|
|
mbedtls_sha1_update_ret( &sha1, ssl->session_negotiate->master, 48 );
|
|
mbedtls_sha1_update_ret( &sha1, pad_2, 40 );
|
|
mbedtls_sha1_update_ret( &sha1, hash + 16, 20 );
|
|
mbedtls_sha1_finish_ret( &sha1, hash + 16 );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 );
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
|
|
|
|
mbedtls_md5_free( &md5 );
|
|
mbedtls_sha1_free( &sha1 );
|
|
|
|
return;
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_SSL3 */
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
|
|
void ssl_calc_verify_tls( mbedtls_ssl_context *ssl, unsigned char hash[36] )
|
|
{
|
|
mbedtls_md5_context md5;
|
|
mbedtls_sha1_context sha1;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify tls" ) );
|
|
|
|
mbedtls_md5_init( &md5 );
|
|
mbedtls_sha1_init( &sha1 );
|
|
|
|
mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
|
|
mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
|
|
|
|
mbedtls_md5_finish_ret( &md5, hash );
|
|
mbedtls_sha1_finish_ret( &sha1, hash + 16 );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 );
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
|
|
|
|
mbedtls_md5_free( &md5 );
|
|
mbedtls_sha1_free( &sha1 );
|
|
|
|
return;
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
void ssl_calc_verify_tls_sha256( mbedtls_ssl_context *ssl, unsigned char hash[32] )
|
|
{
|
|
mbedtls_sha256_context sha256;
|
|
|
|
mbedtls_sha256_init( &sha256 );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha256" ) );
|
|
|
|
mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 );
|
|
mbedtls_sha256_finish_ret( &sha256, hash );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 32 );
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
|
|
|
|
mbedtls_sha256_free( &sha256 );
|
|
|
|
return;
|
|
}
|
|
#endif /* MBEDTLS_SHA256_C */
|
|
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
void ssl_calc_verify_tls_sha384( mbedtls_ssl_context *ssl, unsigned char hash[48] )
|
|
{
|
|
mbedtls_sha512_context sha512;
|
|
|
|
mbedtls_sha512_init( &sha512 );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha384" ) );
|
|
|
|
mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 );
|
|
mbedtls_sha512_finish_ret( &sha512, hash );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 48 );
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
|
|
|
|
mbedtls_sha512_free( &sha512 );
|
|
|
|
return;
|
|
}
|
|
#endif /* MBEDTLS_SHA512_C */
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
|
|
int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exchange_type_t key_ex )
|
|
{
|
|
unsigned char *p = ssl->handshake->premaster;
|
|
unsigned char *end = p + sizeof( ssl->handshake->premaster );
|
|
const unsigned char *psk = ssl->conf->psk;
|
|
size_t psk_len = ssl->conf->psk_len;
|
|
|
|
/* If the psk callback was called, use its result */
|
|
if( ssl->handshake->psk != NULL )
|
|
{
|
|
psk = ssl->handshake->psk;
|
|
psk_len = ssl->handshake->psk_len;
|
|
}
|
|
|
|
/*
|
|
* PMS = struct {
|
|
* opaque other_secret<0..2^16-1>;
|
|
* opaque psk<0..2^16-1>;
|
|
* };
|
|
* with "other_secret" depending on the particular key exchange
|
|
*/
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
|
|
if( key_ex == MBEDTLS_KEY_EXCHANGE_PSK )
|
|
{
|
|
if( end - p < 2 )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
*(p++) = (unsigned char)( psk_len >> 8 );
|
|
*(p++) = (unsigned char)( psk_len );
|
|
|
|
if( end < p || (size_t)( end - p ) < psk_len )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
memset( p, 0, psk_len );
|
|
p += psk_len;
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
|
|
if( key_ex == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
|
|
{
|
|
/*
|
|
* other_secret already set by the ClientKeyExchange message,
|
|
* and is 48 bytes long
|
|
*/
|
|
if( end - p < 2 )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
*p++ = 0;
|
|
*p++ = 48;
|
|
p += 48;
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
|
|
if( key_ex == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
|
|
{
|
|
int ret;
|
|
size_t len;
|
|
|
|
/* Write length only when we know the actual value */
|
|
if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx,
|
|
p + 2, end - ( p + 2 ), &len,
|
|
ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret );
|
|
return( ret );
|
|
}
|
|
*(p++) = (unsigned char)( len >> 8 );
|
|
*(p++) = (unsigned char)( len );
|
|
p += len;
|
|
|
|
MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
|
|
if( key_ex == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
|
|
{
|
|
int ret;
|
|
size_t zlen;
|
|
|
|
if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &zlen,
|
|
p + 2, end - ( p + 2 ),
|
|
ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
|
|
return( ret );
|
|
}
|
|
|
|
*(p++) = (unsigned char)( zlen >> 8 );
|
|
*(p++) = (unsigned char)( zlen );
|
|
p += zlen;
|
|
|
|
MBEDTLS_SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.z );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
/* opaque psk<0..2^16-1>; */
|
|
if( end - p < 2 )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
*(p++) = (unsigned char)( psk_len >> 8 );
|
|
*(p++) = (unsigned char)( psk_len );
|
|
|
|
if( end < p || (size_t)( end - p ) < psk_len )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
memcpy( p, psk, psk_len );
|
|
p += psk_len;
|
|
|
|
ssl->handshake->pmslen = p - ssl->handshake->premaster;
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
/*
|
|
* SSLv3.0 MAC functions
|
|
*/
|
|
#define SSL_MAC_MAX_BYTES 20 /* MD-5 or SHA-1 */
|
|
static void ssl_mac( mbedtls_md_context_t *md_ctx,
|
|
const unsigned char *secret,
|
|
const unsigned char *buf, size_t len,
|
|
const unsigned char *ctr, int type,
|
|
unsigned char out[SSL_MAC_MAX_BYTES] )
|
|
{
|
|
unsigned char header[11];
|
|
unsigned char padding[48];
|
|
int padlen;
|
|
int md_size = mbedtls_md_get_size( md_ctx->md_info );
|
|
int md_type = mbedtls_md_get_type( md_ctx->md_info );
|
|
|
|
/* Only MD5 and SHA-1 supported */
|
|
if( md_type == MBEDTLS_MD_MD5 )
|
|
padlen = 48;
|
|
else
|
|
padlen = 40;
|
|
|
|
memcpy( header, ctr, 8 );
|
|
header[ 8] = (unsigned char) type;
|
|
header[ 9] = (unsigned char)( len >> 8 );
|
|
header[10] = (unsigned char)( len );
|
|
|
|
memset( padding, 0x36, padlen );
|
|
mbedtls_md_starts( md_ctx );
|
|
mbedtls_md_update( md_ctx, secret, md_size );
|
|
mbedtls_md_update( md_ctx, padding, padlen );
|
|
mbedtls_md_update( md_ctx, header, 11 );
|
|
mbedtls_md_update( md_ctx, buf, len );
|
|
mbedtls_md_finish( md_ctx, out );
|
|
|
|
memset( padding, 0x5C, padlen );
|
|
mbedtls_md_starts( md_ctx );
|
|
mbedtls_md_update( md_ctx, secret, md_size );
|
|
mbedtls_md_update( md_ctx, padding, padlen );
|
|
mbedtls_md_update( md_ctx, out, md_size );
|
|
mbedtls_md_finish( md_ctx, out );
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_SSL3 */
|
|
|
|
#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER) || \
|
|
( defined(MBEDTLS_CIPHER_MODE_CBC) && \
|
|
( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) ) )
|
|
#define SSL_SOME_MODES_USE_MAC
|
|
#endif
|
|
|
|
/* The function below is only used in the Lucky 13 counter-measure in
|
|
* ssl_decrypt_buf(). These are the defines that guard the call site. */
|
|
#if defined(SSL_SOME_MODES_USE_MAC) && \
|
|
( defined(MBEDTLS_SSL_PROTO_TLS1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_2) )
|
|
/* This function makes sure every byte in the memory region is accessed
|
|
* (in ascending addresses order) */
|
|
static void ssl_read_memory( unsigned char *p, size_t len )
|
|
{
|
|
unsigned char acc = 0;
|
|
volatile unsigned char force;
|
|
|
|
for( ; len != 0; p++, len-- )
|
|
acc ^= *p;
|
|
|
|
force = acc;
|
|
(void) force;
|
|
}
|
|
#endif /* SSL_SOME_MODES_USE_MAC && ( TLS1 || TLS1_1 || TLS1_2 ) */
|
|
|
|
/*
|
|
* Encryption/decryption functions
|
|
*/
|
|
static int ssl_encrypt_buf( mbedtls_ssl_context *ssl )
|
|
{
|
|
mbedtls_cipher_mode_t mode;
|
|
int auth_done = 0;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> encrypt buf" ) );
|
|
|
|
if( ssl->session_out == NULL || ssl->transform_out == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
mode = mbedtls_cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "before encrypt: output payload",
|
|
ssl->out_msg, ssl->out_msglen );
|
|
|
|
if( ssl->out_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Record content %u too large, maximum %d",
|
|
(unsigned) ssl->out_msglen,
|
|
MBEDTLS_SSL_MAX_CONTENT_LEN ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
/*
|
|
* Add MAC before if needed
|
|
*/
|
|
#if defined(SSL_SOME_MODES_USE_MAC)
|
|
if( mode == MBEDTLS_MODE_STREAM ||
|
|
( mode == MBEDTLS_MODE_CBC
|
|
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
|
|
&& ssl->session_out->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED
|
|
#endif
|
|
) )
|
|
{
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
|
|
{
|
|
unsigned char mac[SSL_MAC_MAX_BYTES];
|
|
|
|
ssl_mac( &ssl->transform_out->md_ctx_enc,
|
|
ssl->transform_out->mac_enc,
|
|
ssl->out_msg, ssl->out_msglen,
|
|
ssl->out_ctr, ssl->out_msgtype,
|
|
mac );
|
|
|
|
memcpy( ssl->out_msg + ssl->out_msglen, mac, ssl->transform_out->maclen );
|
|
}
|
|
else
|
|
#endif
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
|
|
{
|
|
unsigned char mac[MBEDTLS_SSL_MAC_ADD];
|
|
|
|
mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_ctr, 8 );
|
|
mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_hdr, 3 );
|
|
mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_len, 2 );
|
|
mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc,
|
|
ssl->out_msg, ssl->out_msglen );
|
|
mbedtls_md_hmac_finish( &ssl->transform_out->md_ctx_enc, mac );
|
|
mbedtls_md_hmac_reset( &ssl->transform_out->md_ctx_enc );
|
|
|
|
memcpy( ssl->out_msg + ssl->out_msglen, mac, ssl->transform_out->maclen );
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "computed mac",
|
|
ssl->out_msg + ssl->out_msglen,
|
|
ssl->transform_out->maclen );
|
|
|
|
ssl->out_msglen += ssl->transform_out->maclen;
|
|
auth_done++;
|
|
}
|
|
#endif /* AEAD not the only option */
|
|
|
|
/*
|
|
* Encrypt
|
|
*/
|
|
#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER)
|
|
if( mode == MBEDTLS_MODE_STREAM )
|
|
{
|
|
int ret;
|
|
size_t olen = 0;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
|
|
"including %d bytes of padding",
|
|
ssl->out_msglen, 0 ) );
|
|
|
|
if( ( ret = mbedtls_cipher_crypt( &ssl->transform_out->cipher_ctx_enc,
|
|
ssl->transform_out->iv_enc,
|
|
ssl->transform_out->ivlen,
|
|
ssl->out_msg, ssl->out_msglen,
|
|
ssl->out_msg, &olen ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ssl->out_msglen != olen )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */
|
|
#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C)
|
|
if( mode == MBEDTLS_MODE_GCM ||
|
|
mode == MBEDTLS_MODE_CCM )
|
|
{
|
|
int ret;
|
|
size_t enc_msglen, olen;
|
|
unsigned char *enc_msg;
|
|
unsigned char add_data[13];
|
|
unsigned char taglen = ssl->transform_out->ciphersuite_info->flags &
|
|
MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16;
|
|
|
|
memcpy( add_data, ssl->out_ctr, 8 );
|
|
add_data[8] = ssl->out_msgtype;
|
|
mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
|
|
ssl->conf->transport, add_data + 9 );
|
|
add_data[11] = ( ssl->out_msglen >> 8 ) & 0xFF;
|
|
add_data[12] = ssl->out_msglen & 0xFF;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "additional data used for AEAD",
|
|
add_data, 13 );
|
|
|
|
/*
|
|
* Generate IV
|
|
*/
|
|
if( ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen != 8 )
|
|
{
|
|
/* Reminder if we ever add an AEAD mode with a different size */
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
memcpy( ssl->transform_out->iv_enc + ssl->transform_out->fixed_ivlen,
|
|
ssl->out_ctr, 8 );
|
|
memcpy( ssl->out_iv, ssl->out_ctr, 8 );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "IV used", ssl->out_iv,
|
|
ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen );
|
|
|
|
/*
|
|
* Fix pointer positions and message length with added IV
|
|
*/
|
|
enc_msg = ssl->out_msg;
|
|
enc_msglen = ssl->out_msglen;
|
|
ssl->out_msglen += ssl->transform_out->ivlen -
|
|
ssl->transform_out->fixed_ivlen;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
|
|
"including %d bytes of padding",
|
|
ssl->out_msglen, 0 ) );
|
|
|
|
/*
|
|
* Encrypt and authenticate
|
|
*/
|
|
if( ( ret = mbedtls_cipher_auth_encrypt( &ssl->transform_out->cipher_ctx_enc,
|
|
ssl->transform_out->iv_enc,
|
|
ssl->transform_out->ivlen,
|
|
add_data, 13,
|
|
enc_msg, enc_msglen,
|
|
enc_msg, &olen,
|
|
enc_msg + enc_msglen, taglen ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_auth_encrypt", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( olen != enc_msglen )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
ssl->out_msglen += taglen;
|
|
auth_done++;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "after encrypt: tag", enc_msg + enc_msglen, taglen );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */
|
|
#if defined(MBEDTLS_CIPHER_MODE_CBC) && \
|
|
( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) )
|
|
if( mode == MBEDTLS_MODE_CBC )
|
|
{
|
|
int ret;
|
|
unsigned char *enc_msg;
|
|
size_t enc_msglen, padlen, olen = 0, i;
|
|
|
|
padlen = ssl->transform_out->ivlen - ( ssl->out_msglen + 1 ) %
|
|
ssl->transform_out->ivlen;
|
|
if( padlen == ssl->transform_out->ivlen )
|
|
padlen = 0;
|
|
|
|
for( i = 0; i <= padlen; i++ )
|
|
ssl->out_msg[ssl->out_msglen + i] = (unsigned char) padlen;
|
|
|
|
ssl->out_msglen += padlen + 1;
|
|
|
|
enc_msglen = ssl->out_msglen;
|
|
enc_msg = ssl->out_msg;
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
/*
|
|
* Prepend per-record IV for block cipher in TLS v1.1 and up as per
|
|
* Method 1 (6.2.3.2. in RFC4346 and RFC5246)
|
|
*/
|
|
if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
|
|
{
|
|
/*
|
|
* Generate IV
|
|
*/
|
|
ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->transform_out->iv_enc,
|
|
ssl->transform_out->ivlen );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
memcpy( ssl->out_iv, ssl->transform_out->iv_enc,
|
|
ssl->transform_out->ivlen );
|
|
|
|
/*
|
|
* Fix pointer positions and message length with added IV
|
|
*/
|
|
enc_msg = ssl->out_msg;
|
|
enc_msglen = ssl->out_msglen;
|
|
ssl->out_msglen += ssl->transform_out->ivlen;
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
|
|
"including %d bytes of IV and %d bytes of padding",
|
|
ssl->out_msglen, ssl->transform_out->ivlen,
|
|
padlen + 1 ) );
|
|
|
|
if( ( ret = mbedtls_cipher_crypt( &ssl->transform_out->cipher_ctx_enc,
|
|
ssl->transform_out->iv_enc,
|
|
ssl->transform_out->ivlen,
|
|
enc_msg, enc_msglen,
|
|
enc_msg, &olen ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( enc_msglen != olen )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
|
|
if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 )
|
|
{
|
|
/*
|
|
* Save IV in SSL3 and TLS1
|
|
*/
|
|
memcpy( ssl->transform_out->iv_enc,
|
|
ssl->transform_out->cipher_ctx_enc.iv,
|
|
ssl->transform_out->ivlen );
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
|
|
if( auth_done == 0 )
|
|
{
|
|
unsigned char mac[MBEDTLS_SSL_MAC_ADD];
|
|
|
|
/*
|
|
* MAC(MAC_write_key, seq_num +
|
|
* TLSCipherText.type +
|
|
* TLSCipherText.version +
|
|
* length_of( (IV +) ENC(...) ) +
|
|
* IV + // except for TLS 1.0
|
|
* ENC(content + padding + padding_length));
|
|
*/
|
|
unsigned char pseudo_hdr[13];
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) );
|
|
|
|
memcpy( pseudo_hdr + 0, ssl->out_ctr, 8 );
|
|
memcpy( pseudo_hdr + 8, ssl->out_hdr, 3 );
|
|
pseudo_hdr[11] = (unsigned char)( ( ssl->out_msglen >> 8 ) & 0xFF );
|
|
pseudo_hdr[12] = (unsigned char)( ( ssl->out_msglen ) & 0xFF );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "MAC'd meta-data", pseudo_hdr, 13 );
|
|
|
|
mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, pseudo_hdr, 13 );
|
|
mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc,
|
|
ssl->out_iv, ssl->out_msglen );
|
|
mbedtls_md_hmac_finish( &ssl->transform_out->md_ctx_enc, mac );
|
|
mbedtls_md_hmac_reset( &ssl->transform_out->md_ctx_enc );
|
|
|
|
memcpy( ssl->out_iv + ssl->out_msglen, mac,
|
|
ssl->transform_out->maclen );
|
|
|
|
ssl->out_msglen += ssl->transform_out->maclen;
|
|
auth_done++;
|
|
}
|
|
#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_CIPHER_MODE_CBC &&
|
|
( MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C ) */
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
/* Make extra sure authentication was performed, exactly once */
|
|
if( auth_done != 1 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= encrypt buf" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int ssl_decrypt_buf( mbedtls_ssl_context *ssl )
|
|
{
|
|
size_t i;
|
|
mbedtls_cipher_mode_t mode;
|
|
int auth_done = 0;
|
|
#if defined(SSL_SOME_MODES_USE_MAC)
|
|
size_t padlen = 0, correct = 1;
|
|
#endif
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> decrypt buf" ) );
|
|
|
|
if( ssl->session_in == NULL || ssl->transform_in == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
mode = mbedtls_cipher_get_cipher_mode( &ssl->transform_in->cipher_ctx_dec );
|
|
|
|
if( ssl->in_msglen < ssl->transform_in->minlen )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "in_msglen (%d) < minlen (%d)",
|
|
ssl->in_msglen, ssl->transform_in->minlen ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_MAC );
|
|
}
|
|
|
|
#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER)
|
|
if( mode == MBEDTLS_MODE_STREAM )
|
|
{
|
|
int ret;
|
|
size_t olen = 0;
|
|
|
|
padlen = 0;
|
|
|
|
if( ( ret = mbedtls_cipher_crypt( &ssl->transform_in->cipher_ctx_dec,
|
|
ssl->transform_in->iv_dec,
|
|
ssl->transform_in->ivlen,
|
|
ssl->in_msg, ssl->in_msglen,
|
|
ssl->in_msg, &olen ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ssl->in_msglen != olen )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */
|
|
#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C)
|
|
if( mode == MBEDTLS_MODE_GCM ||
|
|
mode == MBEDTLS_MODE_CCM )
|
|
{
|
|
int ret;
|
|
size_t dec_msglen, olen;
|
|
unsigned char *dec_msg;
|
|
unsigned char *dec_msg_result;
|
|
unsigned char add_data[13];
|
|
unsigned char taglen = ssl->transform_in->ciphersuite_info->flags &
|
|
MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16;
|
|
size_t explicit_iv_len = ssl->transform_in->ivlen -
|
|
ssl->transform_in->fixed_ivlen;
|
|
|
|
if( ssl->in_msglen < explicit_iv_len + taglen )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < explicit_iv_len (%d) "
|
|
"+ taglen (%d)", ssl->in_msglen,
|
|
explicit_iv_len, taglen ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_MAC );
|
|
}
|
|
dec_msglen = ssl->in_msglen - explicit_iv_len - taglen;
|
|
|
|
dec_msg = ssl->in_msg;
|
|
dec_msg_result = ssl->in_msg;
|
|
ssl->in_msglen = dec_msglen;
|
|
|
|
memcpy( add_data, ssl->in_ctr, 8 );
|
|
add_data[8] = ssl->in_msgtype;
|
|
mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
|
|
ssl->conf->transport, add_data + 9 );
|
|
add_data[11] = ( ssl->in_msglen >> 8 ) & 0xFF;
|
|
add_data[12] = ssl->in_msglen & 0xFF;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "additional data used for AEAD",
|
|
add_data, 13 );
|
|
|
|
memcpy( ssl->transform_in->iv_dec + ssl->transform_in->fixed_ivlen,
|
|
ssl->in_iv,
|
|
ssl->transform_in->ivlen - ssl->transform_in->fixed_ivlen );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "IV used", ssl->transform_in->iv_dec,
|
|
ssl->transform_in->ivlen );
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "TAG used", dec_msg + dec_msglen, taglen );
|
|
|
|
/*
|
|
* Decrypt and authenticate
|
|
*/
|
|
if( ( ret = mbedtls_cipher_auth_decrypt( &ssl->transform_in->cipher_ctx_dec,
|
|
ssl->transform_in->iv_dec,
|
|
ssl->transform_in->ivlen,
|
|
add_data, 13,
|
|
dec_msg, dec_msglen,
|
|
dec_msg_result, &olen,
|
|
dec_msg + dec_msglen, taglen ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_auth_decrypt", ret );
|
|
|
|
if( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED )
|
|
return( MBEDTLS_ERR_SSL_INVALID_MAC );
|
|
|
|
return( ret );
|
|
}
|
|
auth_done++;
|
|
|
|
if( olen != dec_msglen )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */
|
|
#if defined(MBEDTLS_CIPHER_MODE_CBC) && \
|
|
( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) )
|
|
if( mode == MBEDTLS_MODE_CBC )
|
|
{
|
|
/*
|
|
* Decrypt and check the padding
|
|
*/
|
|
int ret;
|
|
unsigned char *dec_msg;
|
|
unsigned char *dec_msg_result;
|
|
size_t dec_msglen;
|
|
size_t minlen = 0;
|
|
size_t olen = 0;
|
|
|
|
/*
|
|
* Check immediate ciphertext sanity
|
|
*/
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
|
|
minlen += ssl->transform_in->ivlen;
|
|
#endif
|
|
|
|
if( ssl->in_msglen < minlen + ssl->transform_in->ivlen ||
|
|
ssl->in_msglen < minlen + ssl->transform_in->maclen + 1 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < max( ivlen(%d), maclen (%d) "
|
|
"+ 1 ) ( + expl IV )", ssl->in_msglen,
|
|
ssl->transform_in->ivlen,
|
|
ssl->transform_in->maclen ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_MAC );
|
|
}
|
|
|
|
dec_msglen = ssl->in_msglen;
|
|
dec_msg = ssl->in_msg;
|
|
dec_msg_result = ssl->in_msg;
|
|
|
|
/*
|
|
* Authenticate before decrypt if enabled
|
|
*/
|
|
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
|
|
if( ssl->session_in->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED )
|
|
{
|
|
unsigned char mac_expect[MBEDTLS_SSL_MAC_ADD];
|
|
unsigned char pseudo_hdr[13];
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) );
|
|
|
|
dec_msglen -= ssl->transform_in->maclen;
|
|
ssl->in_msglen -= ssl->transform_in->maclen;
|
|
|
|
memcpy( pseudo_hdr + 0, ssl->in_ctr, 8 );
|
|
memcpy( pseudo_hdr + 8, ssl->in_hdr, 3 );
|
|
pseudo_hdr[11] = (unsigned char)( ( ssl->in_msglen >> 8 ) & 0xFF );
|
|
pseudo_hdr[12] = (unsigned char)( ( ssl->in_msglen ) & 0xFF );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "MAC'd meta-data", pseudo_hdr, 13 );
|
|
|
|
mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, pseudo_hdr, 13 );
|
|
mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec,
|
|
ssl->in_iv, ssl->in_msglen );
|
|
mbedtls_md_hmac_finish( &ssl->transform_in->md_ctx_dec, mac_expect );
|
|
mbedtls_md_hmac_reset( &ssl->transform_in->md_ctx_dec );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "message mac", ssl->in_iv + ssl->in_msglen,
|
|
ssl->transform_in->maclen );
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "expected mac", mac_expect,
|
|
ssl->transform_in->maclen );
|
|
|
|
if( mbedtls_ssl_safer_memcmp( ssl->in_iv + ssl->in_msglen, mac_expect,
|
|
ssl->transform_in->maclen ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "message mac does not match" ) );
|
|
|
|
return( MBEDTLS_ERR_SSL_INVALID_MAC );
|
|
}
|
|
auth_done++;
|
|
}
|
|
#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
|
|
|
|
/*
|
|
* Check length sanity
|
|
*/
|
|
if( ssl->in_msglen % ssl->transform_in->ivlen != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) %% ivlen (%d) != 0",
|
|
ssl->in_msglen, ssl->transform_in->ivlen ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_MAC );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
/*
|
|
* Initialize for prepended IV for block cipher in TLS v1.1 and up
|
|
*/
|
|
if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
|
|
{
|
|
dec_msglen -= ssl->transform_in->ivlen;
|
|
ssl->in_msglen -= ssl->transform_in->ivlen;
|
|
|
|
for( i = 0; i < ssl->transform_in->ivlen; i++ )
|
|
ssl->transform_in->iv_dec[i] = ssl->in_iv[i];
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
|
|
if( ( ret = mbedtls_cipher_crypt( &ssl->transform_in->cipher_ctx_dec,
|
|
ssl->transform_in->iv_dec,
|
|
ssl->transform_in->ivlen,
|
|
dec_msg, dec_msglen,
|
|
dec_msg_result, &olen ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( dec_msglen != olen )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
|
|
if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 )
|
|
{
|
|
/*
|
|
* Save IV in SSL3 and TLS1
|
|
*/
|
|
memcpy( ssl->transform_in->iv_dec,
|
|
ssl->transform_in->cipher_ctx_dec.iv,
|
|
ssl->transform_in->ivlen );
|
|
}
|
|
#endif
|
|
|
|
padlen = 1 + ssl->in_msg[ssl->in_msglen - 1];
|
|
|
|
if( ssl->in_msglen < ssl->transform_in->maclen + padlen &&
|
|
auth_done == 0 )
|
|
{
|
|
#if defined(MBEDTLS_SSL_DEBUG_ALL)
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < maclen (%d) + padlen (%d)",
|
|
ssl->in_msglen, ssl->transform_in->maclen, padlen ) );
|
|
#endif
|
|
padlen = 0;
|
|
correct = 0;
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
|
|
{
|
|
if( padlen > ssl->transform_in->ivlen )
|
|
{
|
|
#if defined(MBEDTLS_SSL_DEBUG_ALL)
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding length: is %d, "
|
|
"should be no more than %d",
|
|
padlen, ssl->transform_in->ivlen ) );
|
|
#endif
|
|
correct = 0;
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_PROTO_SSL3 */
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
if( ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_0 )
|
|
{
|
|
/*
|
|
* TLSv1+: always check the padding up to the first failure
|
|
* and fake check up to 256 bytes of padding
|
|
*/
|
|
size_t pad_count = 0, real_count = 1;
|
|
size_t padding_idx = ssl->in_msglen - padlen;
|
|
|
|
/*
|
|
* Padding is guaranteed to be incorrect if:
|
|
* 1. padlen > ssl->in_msglen
|
|
*
|
|
* 2. padding_idx > MBEDTLS_SSL_MAX_CONTENT_LEN +
|
|
* ssl->transform_in->maclen
|
|
*
|
|
* In both cases we reset padding_idx to a safe value (0) to
|
|
* prevent out-of-buffer reads.
|
|
*/
|
|
correct &= ( padlen <= ssl->in_msglen );
|
|
correct &= ( padding_idx <= MBEDTLS_SSL_MAX_CONTENT_LEN +
|
|
ssl->transform_in->maclen );
|
|
|
|
padding_idx *= correct;
|
|
|
|
for( i = 0; i < 256; i++ )
|
|
{
|
|
real_count &= ( i < padlen );
|
|
pad_count += real_count *
|
|
( ssl->in_msg[padding_idx + i] == padlen - 1 );
|
|
}
|
|
|
|
correct &= ( pad_count == padlen ); /* Only 1 on correct padding */
|
|
|
|
#if defined(MBEDTLS_SSL_DEBUG_ALL)
|
|
if( padlen > 0 && correct == 0 )
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding byte detected" ) );
|
|
#endif
|
|
padlen &= correct * 0x1FF;
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
|
|
MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
ssl->in_msglen -= padlen;
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_CIPHER_MODE_CBC &&
|
|
( MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C ) */
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_DEBUG_ALL)
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "raw buffer after decryption",
|
|
ssl->in_msg, ssl->in_msglen );
|
|
#endif
|
|
|
|
/*
|
|
* Authenticate if not done yet.
|
|
* Compute the MAC regardless of the padding result (RFC4346, CBCTIME).
|
|
*/
|
|
#if defined(SSL_SOME_MODES_USE_MAC)
|
|
if( auth_done == 0 )
|
|
{
|
|
unsigned char mac_expect[MBEDTLS_SSL_MAC_ADD];
|
|
|
|
ssl->in_msglen -= ssl->transform_in->maclen;
|
|
|
|
ssl->in_len[0] = (unsigned char)( ssl->in_msglen >> 8 );
|
|
ssl->in_len[1] = (unsigned char)( ssl->in_msglen );
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
|
|
{
|
|
ssl_mac( &ssl->transform_in->md_ctx_dec,
|
|
ssl->transform_in->mac_dec,
|
|
ssl->in_msg, ssl->in_msglen,
|
|
ssl->in_ctr, ssl->in_msgtype,
|
|
mac_expect );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_PROTO_SSL3 */
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
if( ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_0 )
|
|
{
|
|
/*
|
|
* Process MAC and always update for padlen afterwards to make
|
|
* total time independent of padlen.
|
|
*
|
|
* Known timing attacks:
|
|
* - Lucky Thirteen (http://www.isg.rhul.ac.uk/tls/TLStiming.pdf)
|
|
*
|
|
* To compensate for different timings for the MAC calculation
|
|
* depending on how much padding was removed (which is determined
|
|
* by padlen), process extra_run more blocks through the hash
|
|
* function.
|
|
*
|
|
* The formula in the paper is
|
|
* extra_run = ceil( (L1-55) / 64 ) - ceil( (L2-55) / 64 )
|
|
* where L1 is the size of the header plus the decrypted message
|
|
* plus CBC padding and L2 is the size of the header plus the
|
|
* decrypted message. This is for an underlying hash function
|
|
* with 64-byte blocks.
|
|
* We use ( (Lx+8) / 64 ) to handle 'negative Lx' values
|
|
* correctly. We round down instead of up, so -56 is the correct
|
|
* value for our calculations instead of -55.
|
|
*
|
|
* Repeat the formula rather than defining a block_size variable.
|
|
* This avoids requiring division by a variable at runtime
|
|
* (which would be marginally less efficient and would require
|
|
* linking an extra division function in some builds).
|
|
*/
|
|
size_t j, extra_run = 0;
|
|
|
|
/*
|
|
* The next two sizes are the minimum and maximum values of
|
|
* in_msglen over all padlen values.
|
|
*
|
|
* They're independent of padlen, since we previously did
|
|
* in_msglen -= padlen.
|
|
*
|
|
* Note that max_len + maclen is never more than the buffer
|
|
* length, as we previously did in_msglen -= maclen too.
|
|
*/
|
|
const size_t max_len = ssl->in_msglen + padlen;
|
|
const size_t min_len = ( max_len > 256 ) ? max_len - 256 : 0;
|
|
|
|
switch( ssl->transform_in->ciphersuite_info->mac )
|
|
{
|
|
#if defined(MBEDTLS_MD5_C) || defined(MBEDTLS_SHA1_C) || \
|
|
defined(MBEDTLS_SHA256_C)
|
|
case MBEDTLS_MD_MD5:
|
|
case MBEDTLS_MD_SHA1:
|
|
case MBEDTLS_MD_SHA256:
|
|
/* 8 bytes of message size, 64-byte compression blocks */
|
|
extra_run = ( 13 + ssl->in_msglen + padlen + 8 ) / 64 -
|
|
( 13 + ssl->in_msglen + 8 ) / 64;
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
case MBEDTLS_MD_SHA384:
|
|
/* 16 bytes of message size, 128-byte compression blocks */
|
|
extra_run = ( 13 + ssl->in_msglen + padlen + 16 ) / 128 -
|
|
( 13 + ssl->in_msglen + 16 ) / 128;
|
|
break;
|
|
#endif
|
|
default:
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
extra_run &= correct * 0xFF;
|
|
|
|
mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_ctr, 8 );
|
|
mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_hdr, 3 );
|
|
mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_len, 2 );
|
|
mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_msg,
|
|
ssl->in_msglen );
|
|
/* Make sure we access everything even when padlen > 0. This
|
|
* makes the synchronisation requirements for just-in-time
|
|
* Prime+Probe attacks much tighter and hopefully impractical. */
|
|
ssl_read_memory( ssl->in_msg + ssl->in_msglen, padlen );
|
|
mbedtls_md_hmac_finish( &ssl->transform_in->md_ctx_dec, mac_expect );
|
|
|
|
/* Call mbedtls_md_process at least once due to cache attacks
|
|
* that observe whether md_process() was called of not */
|
|
for( j = 0; j < extra_run + 1; j++ )
|
|
mbedtls_md_process( &ssl->transform_in->md_ctx_dec, ssl->in_msg );
|
|
|
|
mbedtls_md_hmac_reset( &ssl->transform_in->md_ctx_dec );
|
|
|
|
/* Make sure we access all the memory that could contain the MAC,
|
|
* before we check it in the next code block. This makes the
|
|
* synchronisation requirements for just-in-time Prime+Probe
|
|
* attacks much tighter and hopefully impractical. */
|
|
ssl_read_memory( ssl->in_msg + min_len,
|
|
max_len - min_len + ssl->transform_in->maclen );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
|
|
MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_DEBUG_ALL)
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "expected mac", mac_expect, ssl->transform_in->maclen );
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "message mac", ssl->in_msg + ssl->in_msglen,
|
|
ssl->transform_in->maclen );
|
|
#endif
|
|
|
|
if( mbedtls_ssl_safer_memcmp( ssl->in_msg + ssl->in_msglen, mac_expect,
|
|
ssl->transform_in->maclen ) != 0 )
|
|
{
|
|
#if defined(MBEDTLS_SSL_DEBUG_ALL)
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "message mac does not match" ) );
|
|
#endif
|
|
correct = 0;
|
|
}
|
|
auth_done++;
|
|
}
|
|
|
|
/*
|
|
* Finally check the correct flag
|
|
*/
|
|
if( correct == 0 )
|
|
return( MBEDTLS_ERR_SSL_INVALID_MAC );
|
|
#endif /* SSL_SOME_MODES_USE_MAC */
|
|
|
|
/* Make extra sure authentication was performed, exactly once */
|
|
if( auth_done != 1 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
if( ssl->in_msglen == 0 )
|
|
{
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3
|
|
&& ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA )
|
|
{
|
|
/* TLS v1.2 explicitly disallows zero-length messages which are not application data */
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid zero-length message type: %d", ssl->in_msgtype ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
|
|
ssl->nb_zero++;
|
|
|
|
/*
|
|
* Three or more empty messages may be a DoS attack
|
|
* (excessive CPU consumption).
|
|
*/
|
|
if( ssl->nb_zero > 3 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "received four consecutive empty "
|
|
"messages, possible DoS attack" ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_MAC );
|
|
}
|
|
}
|
|
else
|
|
ssl->nb_zero = 0;
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
{
|
|
; /* in_ctr read from peer, not maintained internally */
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
for( i = 8; i > ssl_ep_len( ssl ); i-- )
|
|
if( ++ssl->in_ctr[i - 1] != 0 )
|
|
break;
|
|
|
|
/* The loop goes to its end iff the counter is wrapping */
|
|
if( i == ssl_ep_len( ssl ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "incoming message counter would wrap" ) );
|
|
return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
|
|
}
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= decrypt buf" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
#undef MAC_NONE
|
|
#undef MAC_PLAINTEXT
|
|
#undef MAC_CIPHERTEXT
|
|
|
|
#if defined(MBEDTLS_ZLIB_SUPPORT)
|
|
/*
|
|
* Compression/decompression functions
|
|
*/
|
|
static int ssl_compress_buf( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
unsigned char *msg_post = ssl->out_msg;
|
|
ptrdiff_t bytes_written = ssl->out_msg - ssl->out_buf;
|
|
size_t len_pre = ssl->out_msglen;
|
|
unsigned char *msg_pre = ssl->compress_buf;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> compress buf" ) );
|
|
|
|
if( len_pre == 0 )
|
|
return( 0 );
|
|
|
|
memcpy( msg_pre, ssl->out_msg, len_pre );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "before compression: msglen = %d, ",
|
|
ssl->out_msglen ) );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "before compression: output payload",
|
|
ssl->out_msg, ssl->out_msglen );
|
|
|
|
ssl->transform_out->ctx_deflate.next_in = msg_pre;
|
|
ssl->transform_out->ctx_deflate.avail_in = len_pre;
|
|
ssl->transform_out->ctx_deflate.next_out = msg_post;
|
|
ssl->transform_out->ctx_deflate.avail_out = MBEDTLS_SSL_BUFFER_LEN - bytes_written;
|
|
|
|
ret = deflate( &ssl->transform_out->ctx_deflate, Z_SYNC_FLUSH );
|
|
if( ret != Z_OK )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "failed to perform compression (%d)", ret ) );
|
|
return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
|
|
}
|
|
|
|
ssl->out_msglen = MBEDTLS_SSL_BUFFER_LEN -
|
|
ssl->transform_out->ctx_deflate.avail_out - bytes_written;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "after compression: msglen = %d, ",
|
|
ssl->out_msglen ) );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "after compression: output payload",
|
|
ssl->out_msg, ssl->out_msglen );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= compress buf" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int ssl_decompress_buf( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
unsigned char *msg_post = ssl->in_msg;
|
|
ptrdiff_t header_bytes = ssl->in_msg - ssl->in_buf;
|
|
size_t len_pre = ssl->in_msglen;
|
|
unsigned char *msg_pre = ssl->compress_buf;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> decompress buf" ) );
|
|
|
|
if( len_pre == 0 )
|
|
return( 0 );
|
|
|
|
memcpy( msg_pre, ssl->in_msg, len_pre );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "before decompression: msglen = %d, ",
|
|
ssl->in_msglen ) );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "before decompression: input payload",
|
|
ssl->in_msg, ssl->in_msglen );
|
|
|
|
ssl->transform_in->ctx_inflate.next_in = msg_pre;
|
|
ssl->transform_in->ctx_inflate.avail_in = len_pre;
|
|
ssl->transform_in->ctx_inflate.next_out = msg_post;
|
|
ssl->transform_in->ctx_inflate.avail_out = MBEDTLS_SSL_BUFFER_LEN -
|
|
header_bytes;
|
|
|
|
ret = inflate( &ssl->transform_in->ctx_inflate, Z_SYNC_FLUSH );
|
|
if( ret != Z_OK )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "failed to perform decompression (%d)", ret ) );
|
|
return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
|
|
}
|
|
|
|
ssl->in_msglen = MBEDTLS_SSL_BUFFER_LEN -
|
|
ssl->transform_in->ctx_inflate.avail_out - header_bytes;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "after decompression: msglen = %d, ",
|
|
ssl->in_msglen ) );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "after decompression: input payload",
|
|
ssl->in_msg, ssl->in_msglen );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= decompress buf" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_ZLIB_SUPPORT */
|
|
|
|
#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
static int ssl_write_hello_request( mbedtls_ssl_context *ssl );
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
static int ssl_resend_hello_request( mbedtls_ssl_context *ssl )
|
|
{
|
|
/* If renegotiation is not enforced, retransmit until we would reach max
|
|
* timeout if we were using the usual handshake doubling scheme */
|
|
if( ssl->conf->renego_max_records < 0 )
|
|
{
|
|
uint32_t ratio = ssl->conf->hs_timeout_max / ssl->conf->hs_timeout_min + 1;
|
|
unsigned char doublings = 1;
|
|
|
|
while( ratio != 0 )
|
|
{
|
|
++doublings;
|
|
ratio >>= 1;
|
|
}
|
|
|
|
if( ++ssl->renego_records_seen > doublings )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "no longer retransmitting hello request" ) );
|
|
return( 0 );
|
|
}
|
|
}
|
|
|
|
return( ssl_write_hello_request( ssl ) );
|
|
}
|
|
#endif
|
|
#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
|
|
|
|
/*
|
|
* Fill the input message buffer by appending data to it.
|
|
* The amount of data already fetched is in ssl->in_left.
|
|
*
|
|
* If we return 0, is it guaranteed that (at least) nb_want bytes are
|
|
* available (from this read and/or a previous one). Otherwise, an error code
|
|
* is returned (possibly EOF or WANT_READ).
|
|
*
|
|
* With stream transport (TLS) on success ssl->in_left == nb_want, but
|
|
* with datagram transport (DTLS) on success ssl->in_left >= nb_want,
|
|
* since we always read a whole datagram at once.
|
|
*
|
|
* For DTLS, it is up to the caller to set ssl->next_record_offset when
|
|
* they're done reading a record.
|
|
*/
|
|
int mbedtls_ssl_fetch_input( mbedtls_ssl_context *ssl, size_t nb_want )
|
|
{
|
|
int ret;
|
|
size_t len;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> fetch input" ) );
|
|
|
|
if( ssl->f_recv == NULL && ssl->f_recv_timeout == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Bad usage of mbedtls_ssl_set_bio() "
|
|
"or mbedtls_ssl_set_bio()" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
if( nb_want > MBEDTLS_SSL_BUFFER_LEN - (size_t)( ssl->in_hdr - ssl->in_buf ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "requesting more data than fits" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
{
|
|
uint32_t timeout;
|
|
|
|
/* Just to be sure */
|
|
if( ssl->f_set_timer == NULL || ssl->f_get_timer == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "You must use "
|
|
"mbedtls_ssl_set_timer_cb() for DTLS" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
/*
|
|
* The point is, we need to always read a full datagram at once, so we
|
|
* sometimes read more then requested, and handle the additional data.
|
|
* It could be the rest of the current record (while fetching the
|
|
* header) and/or some other records in the same datagram.
|
|
*/
|
|
|
|
/*
|
|
* Move to the next record in the already read datagram if applicable
|
|
*/
|
|
if( ssl->next_record_offset != 0 )
|
|
{
|
|
if( ssl->in_left < ssl->next_record_offset )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
ssl->in_left -= ssl->next_record_offset;
|
|
|
|
if( ssl->in_left != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "next record in same datagram, offset: %d",
|
|
ssl->next_record_offset ) );
|
|
memmove( ssl->in_hdr,
|
|
ssl->in_hdr + ssl->next_record_offset,
|
|
ssl->in_left );
|
|
}
|
|
|
|
ssl->next_record_offset = 0;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
|
|
ssl->in_left, nb_want ) );
|
|
|
|
/*
|
|
* Done if we already have enough data.
|
|
*/
|
|
if( nb_want <= ssl->in_left)
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= fetch input" ) );
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* A record can't be split across datagrams. If we need to read but
|
|
* are not at the beginning of a new record, the caller did something
|
|
* wrong.
|
|
*/
|
|
if( ssl->in_left != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
/*
|
|
* Don't even try to read if time's out already.
|
|
* This avoids by-passing the timer when repeatedly receiving messages
|
|
* that will end up being dropped.
|
|
*/
|
|
if( ssl_check_timer( ssl ) != 0 )
|
|
ret = MBEDTLS_ERR_SSL_TIMEOUT;
|
|
else
|
|
{
|
|
len = MBEDTLS_SSL_BUFFER_LEN - ( ssl->in_hdr - ssl->in_buf );
|
|
|
|
if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
|
|
timeout = ssl->handshake->retransmit_timeout;
|
|
else
|
|
timeout = ssl->conf->read_timeout;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "f_recv_timeout: %u ms", timeout ) );
|
|
|
|
if( ssl->f_recv_timeout != NULL )
|
|
ret = ssl->f_recv_timeout( ssl->p_bio, ssl->in_hdr, len,
|
|
timeout );
|
|
else
|
|
ret = ssl->f_recv( ssl->p_bio, ssl->in_hdr, len );
|
|
|
|
MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_recv(_timeout)", ret );
|
|
|
|
if( ret == 0 )
|
|
return( MBEDTLS_ERR_SSL_CONN_EOF );
|
|
}
|
|
|
|
if( ret == MBEDTLS_ERR_SSL_TIMEOUT )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "timeout" ) );
|
|
ssl_set_timer( ssl, 0 );
|
|
|
|
if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
|
|
{
|
|
if( ssl_double_retransmit_timeout( ssl ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake timeout" ) );
|
|
return( MBEDTLS_ERR_SSL_TIMEOUT );
|
|
}
|
|
|
|
if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret );
|
|
return( ret );
|
|
}
|
|
|
|
return( MBEDTLS_ERR_SSL_WANT_READ );
|
|
}
|
|
#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
else if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
|
|
ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
|
|
{
|
|
if( ( ret = ssl_resend_hello_request( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_resend_hello_request", ret );
|
|
return( ret );
|
|
}
|
|
|
|
return( MBEDTLS_ERR_SSL_WANT_READ );
|
|
}
|
|
#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
|
|
}
|
|
|
|
if( ret < 0 )
|
|
return( ret );
|
|
|
|
ssl->in_left = ret;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
|
|
ssl->in_left, nb_want ) );
|
|
|
|
while( ssl->in_left < nb_want )
|
|
{
|
|
len = nb_want - ssl->in_left;
|
|
|
|
if( ssl_check_timer( ssl ) != 0 )
|
|
ret = MBEDTLS_ERR_SSL_TIMEOUT;
|
|
else
|
|
{
|
|
if( ssl->f_recv_timeout != NULL )
|
|
{
|
|
ret = ssl->f_recv_timeout( ssl->p_bio,
|
|
ssl->in_hdr + ssl->in_left, len,
|
|
ssl->conf->read_timeout );
|
|
}
|
|
else
|
|
{
|
|
ret = ssl->f_recv( ssl->p_bio,
|
|
ssl->in_hdr + ssl->in_left, len );
|
|
}
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
|
|
ssl->in_left, nb_want ) );
|
|
MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_recv(_timeout)", ret );
|
|
|
|
if( ret == 0 )
|
|
return( MBEDTLS_ERR_SSL_CONN_EOF );
|
|
|
|
if( ret < 0 )
|
|
return( ret );
|
|
|
|
if ( (size_t)ret > len || ( INT_MAX > SIZE_MAX && ret > SIZE_MAX ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1,
|
|
( "f_recv returned %d bytes but only %lu were requested",
|
|
ret, (unsigned long)len ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
ssl->in_left += ret;
|
|
}
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= fetch input" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Flush any data not yet written
|
|
*/
|
|
int mbedtls_ssl_flush_output( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
unsigned char *buf, i;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> flush output" ) );
|
|
|
|
if( ssl->f_send == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Bad usage of mbedtls_ssl_set_bio() "
|
|
"or mbedtls_ssl_set_bio()" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
/* Avoid incrementing counter if data is flushed */
|
|
if( ssl->out_left == 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= flush output" ) );
|
|
return( 0 );
|
|
}
|
|
|
|
while( ssl->out_left > 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "message length: %d, out_left: %d",
|
|
mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen, ssl->out_left ) );
|
|
|
|
buf = ssl->out_hdr + mbedtls_ssl_hdr_len( ssl ) +
|
|
ssl->out_msglen - ssl->out_left;
|
|
ret = ssl->f_send( ssl->p_bio, buf, ssl->out_left );
|
|
|
|
MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_send", ret );
|
|
|
|
if( ret <= 0 )
|
|
return( ret );
|
|
|
|
if( (size_t)ret > ssl->out_left || ( INT_MAX > SIZE_MAX && ret > SIZE_MAX ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1,
|
|
( "f_send returned %d bytes but only %lu bytes were sent",
|
|
ret, (unsigned long)ssl->out_left ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
ssl->out_left -= ret;
|
|
}
|
|
|
|
for( i = 8; i > ssl_ep_len( ssl ); i-- )
|
|
if( ++ssl->out_ctr[i - 1] != 0 )
|
|
break;
|
|
|
|
/* The loop goes to its end iff the counter is wrapping */
|
|
if( i == ssl_ep_len( ssl ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "outgoing message counter would wrap" ) );
|
|
return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= flush output" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Functions to handle the DTLS retransmission state machine
|
|
*/
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
/*
|
|
* Append current handshake message to current outgoing flight
|
|
*/
|
|
static int ssl_flight_append( mbedtls_ssl_context *ssl )
|
|
{
|
|
mbedtls_ssl_flight_item *msg;
|
|
|
|
/* Allocate space for current message */
|
|
if( ( msg = mbedtls_calloc( 1, sizeof( mbedtls_ssl_flight_item ) ) ) == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc %d bytes failed",
|
|
sizeof( mbedtls_ssl_flight_item ) ) );
|
|
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
|
|
}
|
|
|
|
if( ( msg->p = mbedtls_calloc( 1, ssl->out_msglen ) ) == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc %d bytes failed", ssl->out_msglen ) );
|
|
mbedtls_free( msg );
|
|
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
|
|
}
|
|
|
|
/* Copy current handshake message with headers */
|
|
memcpy( msg->p, ssl->out_msg, ssl->out_msglen );
|
|
msg->len = ssl->out_msglen;
|
|
msg->type = ssl->out_msgtype;
|
|
msg->next = NULL;
|
|
|
|
/* Append to the current flight */
|
|
if( ssl->handshake->flight == NULL )
|
|
ssl->handshake->flight = msg;
|
|
else
|
|
{
|
|
mbedtls_ssl_flight_item *cur = ssl->handshake->flight;
|
|
while( cur->next != NULL )
|
|
cur = cur->next;
|
|
cur->next = msg;
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Free the current flight of handshake messages
|
|
*/
|
|
static void ssl_flight_free( mbedtls_ssl_flight_item *flight )
|
|
{
|
|
mbedtls_ssl_flight_item *cur = flight;
|
|
mbedtls_ssl_flight_item *next;
|
|
|
|
while( cur != NULL )
|
|
{
|
|
next = cur->next;
|
|
|
|
mbedtls_free( cur->p );
|
|
mbedtls_free( cur );
|
|
|
|
cur = next;
|
|
}
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
|
|
static void ssl_dtls_replay_reset( mbedtls_ssl_context *ssl );
|
|
#endif
|
|
|
|
/*
|
|
* Swap transform_out and out_ctr with the alternative ones
|
|
*/
|
|
static void ssl_swap_epochs( mbedtls_ssl_context *ssl )
|
|
{
|
|
mbedtls_ssl_transform *tmp_transform;
|
|
unsigned char tmp_out_ctr[8];
|
|
|
|
if( ssl->transform_out == ssl->handshake->alt_transform_out )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip swap epochs" ) );
|
|
return;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "swap epochs" ) );
|
|
|
|
/* Swap transforms */
|
|
tmp_transform = ssl->transform_out;
|
|
ssl->transform_out = ssl->handshake->alt_transform_out;
|
|
ssl->handshake->alt_transform_out = tmp_transform;
|
|
|
|
/* Swap epoch + sequence_number */
|
|
memcpy( tmp_out_ctr, ssl->out_ctr, 8 );
|
|
memcpy( ssl->out_ctr, ssl->handshake->alt_out_ctr, 8 );
|
|
memcpy( ssl->handshake->alt_out_ctr, tmp_out_ctr, 8 );
|
|
|
|
/* Adjust to the newly activated transform */
|
|
if( ssl->transform_out != NULL &&
|
|
ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
|
|
{
|
|
ssl->out_msg = ssl->out_iv + ssl->transform_out->ivlen -
|
|
ssl->transform_out->fixed_ivlen;
|
|
}
|
|
else
|
|
ssl->out_msg = ssl->out_iv;
|
|
|
|
#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
|
|
if( mbedtls_ssl_hw_record_activate != NULL )
|
|
{
|
|
if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
|
|
return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Retransmit the current flight of messages.
|
|
*
|
|
* Need to remember the current message in case flush_output returns
|
|
* WANT_WRITE, causing us to exit this function and come back later.
|
|
* This function must be called until state is no longer SENDING.
|
|
*/
|
|
int mbedtls_ssl_resend( mbedtls_ssl_context *ssl )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> mbedtls_ssl_resend" ) );
|
|
|
|
if( ssl->handshake->retransmit_state != MBEDTLS_SSL_RETRANS_SENDING )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialise resending" ) );
|
|
|
|
ssl->handshake->cur_msg = ssl->handshake->flight;
|
|
ssl_swap_epochs( ssl );
|
|
|
|
ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_SENDING;
|
|
}
|
|
|
|
while( ssl->handshake->cur_msg != NULL )
|
|
{
|
|
int ret;
|
|
mbedtls_ssl_flight_item *cur = ssl->handshake->cur_msg;
|
|
|
|
/* Swap epochs before sending Finished: we can't do it after
|
|
* sending ChangeCipherSpec, in case write returns WANT_READ.
|
|
* Must be done before copying, may change out_msg pointer */
|
|
if( cur->type == MBEDTLS_SSL_MSG_HANDSHAKE &&
|
|
cur->p[0] == MBEDTLS_SSL_HS_FINISHED )
|
|
{
|
|
ssl_swap_epochs( ssl );
|
|
}
|
|
|
|
memcpy( ssl->out_msg, cur->p, cur->len );
|
|
ssl->out_msglen = cur->len;
|
|
ssl->out_msgtype = cur->type;
|
|
|
|
ssl->handshake->cur_msg = cur->next;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "resent handshake message header", ssl->out_msg, 12 );
|
|
|
|
if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
|
|
ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
|
|
else
|
|
{
|
|
ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
|
|
ssl_set_timer( ssl, ssl->handshake->retransmit_timeout );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= mbedtls_ssl_resend" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* To be called when the last message of an incoming flight is received.
|
|
*/
|
|
void mbedtls_ssl_recv_flight_completed( mbedtls_ssl_context *ssl )
|
|
{
|
|
/* We won't need to resend that one any more */
|
|
ssl_flight_free( ssl->handshake->flight );
|
|
ssl->handshake->flight = NULL;
|
|
ssl->handshake->cur_msg = NULL;
|
|
|
|
/* The next incoming flight will start with this msg_seq */
|
|
ssl->handshake->in_flight_start_seq = ssl->handshake->in_msg_seq;
|
|
|
|
/* Cancel timer */
|
|
ssl_set_timer( ssl, 0 );
|
|
|
|
if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
|
|
ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED )
|
|
{
|
|
ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
|
|
}
|
|
else
|
|
ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING;
|
|
}
|
|
|
|
/*
|
|
* To be called when the last message of an outgoing flight is send.
|
|
*/
|
|
void mbedtls_ssl_send_flight_completed( mbedtls_ssl_context *ssl )
|
|
{
|
|
ssl_reset_retransmit_timeout( ssl );
|
|
ssl_set_timer( ssl, ssl->handshake->retransmit_timeout );
|
|
|
|
if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
|
|
ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED )
|
|
{
|
|
ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
|
|
}
|
|
else
|
|
ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_DTLS */
|
|
|
|
/*
|
|
* Record layer functions
|
|
*/
|
|
|
|
/*
|
|
* Write current record.
|
|
* Uses ssl->out_msgtype, ssl->out_msglen and bytes at ssl->out_msg.
|
|
*/
|
|
int mbedtls_ssl_write_record( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret, done = 0, out_msg_type;
|
|
size_t len = ssl->out_msglen;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write record" ) );
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
|
|
ssl->handshake != NULL &&
|
|
ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
|
|
{
|
|
; /* Skip special handshake treatment when resending */
|
|
}
|
|
else
|
|
#endif
|
|
if( ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
|
|
{
|
|
out_msg_type = ssl->out_msg[0];
|
|
|
|
if( out_msg_type != MBEDTLS_SSL_HS_HELLO_REQUEST &&
|
|
ssl->handshake == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
ssl->out_msg[1] = (unsigned char)( ( len - 4 ) >> 16 );
|
|
ssl->out_msg[2] = (unsigned char)( ( len - 4 ) >> 8 );
|
|
ssl->out_msg[3] = (unsigned char)( ( len - 4 ) );
|
|
|
|
/*
|
|
* DTLS has additional fields in the Handshake layer,
|
|
* between the length field and the actual payload:
|
|
* uint16 message_seq;
|
|
* uint24 fragment_offset;
|
|
* uint24 fragment_length;
|
|
*/
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
{
|
|
/* Make room for the additional DTLS fields */
|
|
if( MBEDTLS_SSL_MAX_CONTENT_LEN - ssl->out_msglen < 8 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS handshake message too large: "
|
|
"size %u, maximum %u",
|
|
(unsigned) ( ssl->in_hslen - 4 ),
|
|
(unsigned) ( MBEDTLS_SSL_MAX_CONTENT_LEN - 12 ) ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
memmove( ssl->out_msg + 12, ssl->out_msg + 4, len - 4 );
|
|
ssl->out_msglen += 8;
|
|
len += 8;
|
|
|
|
/* Write message_seq and update it, except for HelloRequest */
|
|
if( out_msg_type != MBEDTLS_SSL_HS_HELLO_REQUEST )
|
|
{
|
|
ssl->out_msg[4] = ( ssl->handshake->out_msg_seq >> 8 ) & 0xFF;
|
|
ssl->out_msg[5] = ( ssl->handshake->out_msg_seq ) & 0xFF;
|
|
++( ssl->handshake->out_msg_seq );
|
|
}
|
|
else
|
|
{
|
|
ssl->out_msg[4] = 0;
|
|
ssl->out_msg[5] = 0;
|
|
}
|
|
|
|
/* We don't fragment, so frag_offset = 0 and frag_len = len */
|
|
memset( ssl->out_msg + 6, 0x00, 3 );
|
|
memcpy( ssl->out_msg + 9, ssl->out_msg + 1, 3 );
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_DTLS */
|
|
|
|
if( out_msg_type != MBEDTLS_SSL_HS_HELLO_REQUEST )
|
|
ssl->handshake->update_checksum( ssl, ssl->out_msg, len );
|
|
}
|
|
|
|
/* Save handshake and CCS messages for resending */
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
|
|
ssl->handshake != NULL &&
|
|
ssl->handshake->retransmit_state != MBEDTLS_SSL_RETRANS_SENDING &&
|
|
( ssl->out_msgtype == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC ||
|
|
ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE ) )
|
|
{
|
|
if( ( ret = ssl_flight_append( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_flight_append", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_ZLIB_SUPPORT)
|
|
if( ssl->transform_out != NULL &&
|
|
ssl->session_out->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
|
|
{
|
|
if( ( ret = ssl_compress_buf( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_compress_buf", ret );
|
|
return( ret );
|
|
}
|
|
|
|
len = ssl->out_msglen;
|
|
}
|
|
#endif /*MBEDTLS_ZLIB_SUPPORT */
|
|
|
|
#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
|
|
if( mbedtls_ssl_hw_record_write != NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_write()" ) );
|
|
|
|
ret = mbedtls_ssl_hw_record_write( ssl );
|
|
if( ret != 0 && ret != MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_write", ret );
|
|
return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
|
|
}
|
|
|
|
if( ret == 0 )
|
|
done = 1;
|
|
}
|
|
#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
|
|
if( !done )
|
|
{
|
|
ssl->out_hdr[0] = (unsigned char) ssl->out_msgtype;
|
|
mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
|
|
ssl->conf->transport, ssl->out_hdr + 1 );
|
|
|
|
ssl->out_len[0] = (unsigned char)( len >> 8 );
|
|
ssl->out_len[1] = (unsigned char)( len );
|
|
|
|
if( ssl->transform_out != NULL )
|
|
{
|
|
if( ( ret = ssl_encrypt_buf( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_encrypt_buf", ret );
|
|
return( ret );
|
|
}
|
|
|
|
len = ssl->out_msglen;
|
|
ssl->out_len[0] = (unsigned char)( len >> 8 );
|
|
ssl->out_len[1] = (unsigned char)( len );
|
|
}
|
|
|
|
ssl->out_left = mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "output record: msgtype = %d, "
|
|
"version = [%d:%d], msglen = %d",
|
|
ssl->out_hdr[0], ssl->out_hdr[1], ssl->out_hdr[2],
|
|
( ssl->out_len[0] << 8 ) | ssl->out_len[1] ) );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "output record sent to network",
|
|
ssl->out_hdr, mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen );
|
|
}
|
|
|
|
if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret );
|
|
return( ret );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write record" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
/*
|
|
* Mark bits in bitmask (used for DTLS HS reassembly)
|
|
*/
|
|
static void ssl_bitmask_set( unsigned char *mask, size_t offset, size_t len )
|
|
{
|
|
unsigned int start_bits, end_bits;
|
|
|
|
start_bits = 8 - ( offset % 8 );
|
|
if( start_bits != 8 )
|
|
{
|
|
size_t first_byte_idx = offset / 8;
|
|
|
|
/* Special case */
|
|
if( len <= start_bits )
|
|
{
|
|
for( ; len != 0; len-- )
|
|
mask[first_byte_idx] |= 1 << ( start_bits - len );
|
|
|
|
/* Avoid potential issues with offset or len becoming invalid */
|
|
return;
|
|
}
|
|
|
|
offset += start_bits; /* Now offset % 8 == 0 */
|
|
len -= start_bits;
|
|
|
|
for( ; start_bits != 0; start_bits-- )
|
|
mask[first_byte_idx] |= 1 << ( start_bits - 1 );
|
|
}
|
|
|
|
end_bits = len % 8;
|
|
if( end_bits != 0 )
|
|
{
|
|
size_t last_byte_idx = ( offset + len ) / 8;
|
|
|
|
len -= end_bits; /* Now len % 8 == 0 */
|
|
|
|
for( ; end_bits != 0; end_bits-- )
|
|
mask[last_byte_idx] |= 1 << ( 8 - end_bits );
|
|
}
|
|
|
|
memset( mask + offset / 8, 0xFF, len / 8 );
|
|
}
|
|
|
|
/*
|
|
* Check that bitmask is full
|
|
*/
|
|
static int ssl_bitmask_check( unsigned char *mask, size_t len )
|
|
{
|
|
size_t i;
|
|
|
|
for( i = 0; i < len / 8; i++ )
|
|
if( mask[i] != 0xFF )
|
|
return( -1 );
|
|
|
|
for( i = 0; i < len % 8; i++ )
|
|
if( ( mask[len / 8] & ( 1 << ( 7 - i ) ) ) == 0 )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Reassemble fragmented DTLS handshake messages.
|
|
*
|
|
* Use a temporary buffer for reassembly, divided in two parts:
|
|
* - the first holds the reassembled message (including handshake header),
|
|
* - the second holds a bitmask indicating which parts of the message
|
|
* (excluding headers) have been received so far.
|
|
*/
|
|
static int ssl_reassemble_dtls_handshake( mbedtls_ssl_context *ssl )
|
|
{
|
|
unsigned char *msg, *bitmask;
|
|
size_t frag_len, frag_off;
|
|
size_t msg_len = ssl->in_hslen - 12; /* Without headers */
|
|
|
|
if( ssl->handshake == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "not supported outside handshake (for now)" ) );
|
|
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
|
|
}
|
|
|
|
/*
|
|
* For first fragment, check size and allocate buffer
|
|
*/
|
|
if( ssl->handshake->hs_msg == NULL )
|
|
{
|
|
size_t alloc_len;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialize reassembly, total length = %d",
|
|
msg_len ) );
|
|
|
|
if( ssl->in_hslen > MBEDTLS_SSL_MAX_CONTENT_LEN )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake message too large" ) );
|
|
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
|
|
}
|
|
|
|
/* The bitmask needs one bit per byte of message excluding header */
|
|
alloc_len = 12 + msg_len + msg_len / 8 + ( msg_len % 8 != 0 );
|
|
|
|
ssl->handshake->hs_msg = mbedtls_calloc( 1, alloc_len );
|
|
if( ssl->handshake->hs_msg == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc failed (%d bytes)", alloc_len ) );
|
|
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
|
|
}
|
|
|
|
/* Prepare final header: copy msg_type, length and message_seq,
|
|
* then add standardised fragment_offset and fragment_length */
|
|
memcpy( ssl->handshake->hs_msg, ssl->in_msg, 6 );
|
|
memset( ssl->handshake->hs_msg + 6, 0, 3 );
|
|
memcpy( ssl->handshake->hs_msg + 9,
|
|
ssl->handshake->hs_msg + 1, 3 );
|
|
}
|
|
else
|
|
{
|
|
/* Make sure msg_type and length are consistent */
|
|
if( memcmp( ssl->handshake->hs_msg, ssl->in_msg, 4 ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "fragment header mismatch" ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
}
|
|
|
|
msg = ssl->handshake->hs_msg + 12;
|
|
bitmask = msg + msg_len;
|
|
|
|
/*
|
|
* Check and copy current fragment
|
|
*/
|
|
frag_off = ( ssl->in_msg[6] << 16 ) |
|
|
( ssl->in_msg[7] << 8 ) |
|
|
ssl->in_msg[8];
|
|
frag_len = ( ssl->in_msg[9] << 16 ) |
|
|
( ssl->in_msg[10] << 8 ) |
|
|
ssl->in_msg[11];
|
|
|
|
if( frag_off + frag_len > msg_len )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid fragment offset/len: %d + %d > %d",
|
|
frag_off, frag_len, msg_len ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
|
|
if( frag_len + 12 > ssl->in_msglen )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid fragment length: %d + 12 > %d",
|
|
frag_len, ssl->in_msglen ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "adding fragment, offset = %d, length = %d",
|
|
frag_off, frag_len ) );
|
|
|
|
memcpy( msg + frag_off, ssl->in_msg + 12, frag_len );
|
|
ssl_bitmask_set( bitmask, frag_off, frag_len );
|
|
|
|
/*
|
|
* Do we have the complete message by now?
|
|
* If yes, finalize it, else ask to read the next record.
|
|
*/
|
|
if( ssl_bitmask_check( bitmask, msg_len ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "message is not complete yet" ) );
|
|
return( MBEDTLS_ERR_SSL_WANT_READ );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake message completed" ) );
|
|
|
|
if( frag_len + 12 < ssl->in_msglen )
|
|
{
|
|
/*
|
|
* We'got more handshake messages in the same record.
|
|
* This case is not handled now because no know implementation does
|
|
* that and it's hard to test, so we prefer to fail cleanly for now.
|
|
*/
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "last fragment not alone in its record" ) );
|
|
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
|
|
}
|
|
|
|
if( ssl->in_left > ssl->next_record_offset )
|
|
{
|
|
/*
|
|
* We've got more data in the buffer after the current record,
|
|
* that we don't want to overwrite. Move it before writing the
|
|
* reassembled message, and adjust in_left and next_record_offset.
|
|
*/
|
|
unsigned char *cur_remain = ssl->in_hdr + ssl->next_record_offset;
|
|
unsigned char *new_remain = ssl->in_msg + ssl->in_hslen;
|
|
size_t remain_len = ssl->in_left - ssl->next_record_offset;
|
|
|
|
/* First compute and check new lengths */
|
|
ssl->next_record_offset = new_remain - ssl->in_hdr;
|
|
ssl->in_left = ssl->next_record_offset + remain_len;
|
|
|
|
if( ssl->in_left > MBEDTLS_SSL_BUFFER_LEN -
|
|
(size_t)( ssl->in_hdr - ssl->in_buf ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "reassembled message too large for buffer" ) );
|
|
return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
|
|
}
|
|
|
|
memmove( new_remain, cur_remain, remain_len );
|
|
}
|
|
|
|
memcpy( ssl->in_msg, ssl->handshake->hs_msg, ssl->in_hslen );
|
|
|
|
mbedtls_zeroize( ssl->handshake->hs_msg, ssl->in_hslen );
|
|
mbedtls_free( ssl->handshake->hs_msg );
|
|
ssl->handshake->hs_msg = NULL;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "reassembled handshake message",
|
|
ssl->in_msg, ssl->in_hslen );
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_DTLS */
|
|
|
|
int mbedtls_ssl_prepare_handshake_record( mbedtls_ssl_context *ssl )
|
|
{
|
|
if( ssl->in_msglen < mbedtls_ssl_hs_hdr_len( ssl ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake message too short: %d",
|
|
ssl->in_msglen ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
|
|
ssl->in_hslen = mbedtls_ssl_hs_hdr_len( ssl ) + (
|
|
( ssl->in_msg[1] << 16 ) |
|
|
( ssl->in_msg[2] << 8 ) |
|
|
ssl->in_msg[3] );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "handshake message: msglen ="
|
|
" %d, type = %d, hslen = %d",
|
|
ssl->in_msglen, ssl->in_msg[0], ssl->in_hslen ) );
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
{
|
|
int ret;
|
|
unsigned int recv_msg_seq = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5];
|
|
|
|
/* ssl->handshake is NULL when receiving ClientHello for renego */
|
|
if( ssl->handshake != NULL &&
|
|
recv_msg_seq != ssl->handshake->in_msg_seq )
|
|
{
|
|
/* Retransmit only on last message from previous flight, to avoid
|
|
* too many retransmissions.
|
|
* Besides, No sane server ever retransmits HelloVerifyRequest */
|
|
if( recv_msg_seq == ssl->handshake->in_flight_start_seq - 1 &&
|
|
ssl->in_msg[0] != MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "received message from last flight, "
|
|
"message_seq = %d, start_of_flight = %d",
|
|
recv_msg_seq,
|
|
ssl->handshake->in_flight_start_seq ) );
|
|
|
|
if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "dropping out-of-sequence message: "
|
|
"message_seq = %d, expected = %d",
|
|
recv_msg_seq,
|
|
ssl->handshake->in_msg_seq ) );
|
|
}
|
|
|
|
return( MBEDTLS_ERR_SSL_WANT_READ );
|
|
}
|
|
/* Wait until message completion to increment in_msg_seq */
|
|
|
|
/* Reassemble if current message is fragmented or reassembly is
|
|
* already in progress */
|
|
if( ssl->in_msglen < ssl->in_hslen ||
|
|
memcmp( ssl->in_msg + 6, "\0\0\0", 3 ) != 0 ||
|
|
memcmp( ssl->in_msg + 9, ssl->in_msg + 1, 3 ) != 0 ||
|
|
( ssl->handshake != NULL && ssl->handshake->hs_msg != NULL ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "found fragmented DTLS handshake message" ) );
|
|
|
|
if( ( ret = ssl_reassemble_dtls_handshake( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_reassemble_dtls_handshake", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_PROTO_DTLS */
|
|
/* With TLS we don't handle fragmentation (for now) */
|
|
if( ssl->in_msglen < ssl->in_hslen )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLS handshake fragmentation not supported" ) );
|
|
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
void mbedtls_ssl_update_handshake_status( mbedtls_ssl_context *ssl )
|
|
{
|
|
|
|
if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER &&
|
|
ssl->handshake != NULL )
|
|
{
|
|
ssl->handshake->update_checksum( ssl, ssl->in_msg, ssl->in_hslen );
|
|
}
|
|
|
|
/* Handshake message is complete, increment counter */
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
|
|
ssl->handshake != NULL )
|
|
{
|
|
ssl->handshake->in_msg_seq++;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* DTLS anti-replay: RFC 6347 4.1.2.6
|
|
*
|
|
* in_window is a field of bits numbered from 0 (lsb) to 63 (msb).
|
|
* Bit n is set iff record number in_window_top - n has been seen.
|
|
*
|
|
* Usually, in_window_top is the last record number seen and the lsb of
|
|
* in_window is set. The only exception is the initial state (record number 0
|
|
* not seen yet).
|
|
*/
|
|
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
|
|
static void ssl_dtls_replay_reset( mbedtls_ssl_context *ssl )
|
|
{
|
|
ssl->in_window_top = 0;
|
|
ssl->in_window = 0;
|
|
}
|
|
|
|
static inline uint64_t ssl_load_six_bytes( unsigned char *buf )
|
|
{
|
|
return( ( (uint64_t) buf[0] << 40 ) |
|
|
( (uint64_t) buf[1] << 32 ) |
|
|
( (uint64_t) buf[2] << 24 ) |
|
|
( (uint64_t) buf[3] << 16 ) |
|
|
( (uint64_t) buf[4] << 8 ) |
|
|
( (uint64_t) buf[5] ) );
|
|
}
|
|
|
|
/*
|
|
* Return 0 if sequence number is acceptable, -1 otherwise
|
|
*/
|
|
int mbedtls_ssl_dtls_replay_check( mbedtls_ssl_context *ssl )
|
|
{
|
|
uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 );
|
|
uint64_t bit;
|
|
|
|
if( ssl->conf->anti_replay == MBEDTLS_SSL_ANTI_REPLAY_DISABLED )
|
|
return( 0 );
|
|
|
|
if( rec_seqnum > ssl->in_window_top )
|
|
return( 0 );
|
|
|
|
bit = ssl->in_window_top - rec_seqnum;
|
|
|
|
if( bit >= 64 )
|
|
return( -1 );
|
|
|
|
if( ( ssl->in_window & ( (uint64_t) 1 << bit ) ) != 0 )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Update replay window on new validated record
|
|
*/
|
|
void mbedtls_ssl_dtls_replay_update( mbedtls_ssl_context *ssl )
|
|
{
|
|
uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 );
|
|
|
|
if( ssl->conf->anti_replay == MBEDTLS_SSL_ANTI_REPLAY_DISABLED )
|
|
return;
|
|
|
|
if( rec_seqnum > ssl->in_window_top )
|
|
{
|
|
/* Update window_top and the contents of the window */
|
|
uint64_t shift = rec_seqnum - ssl->in_window_top;
|
|
|
|
if( shift >= 64 )
|
|
ssl->in_window = 1;
|
|
else
|
|
{
|
|
ssl->in_window <<= shift;
|
|
ssl->in_window |= 1;
|
|
}
|
|
|
|
ssl->in_window_top = rec_seqnum;
|
|
}
|
|
else
|
|
{
|
|
/* Mark that number as seen in the current window */
|
|
uint64_t bit = ssl->in_window_top - rec_seqnum;
|
|
|
|
if( bit < 64 ) /* Always true, but be extra sure */
|
|
ssl->in_window |= (uint64_t) 1 << bit;
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */
|
|
|
|
#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C)
|
|
/* Forward declaration */
|
|
static int ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial );
|
|
|
|
/*
|
|
* Without any SSL context, check if a datagram looks like a ClientHello with
|
|
* a valid cookie, and if it doesn't, generate a HelloVerifyRequest message.
|
|
* Both input and output include full DTLS headers.
|
|
*
|
|
* - if cookie is valid, return 0
|
|
* - if ClientHello looks superficially valid but cookie is not,
|
|
* fill obuf and set olen, then
|
|
* return MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED
|
|
* - otherwise return a specific error code
|
|
*/
|
|
static int ssl_check_dtls_clihlo_cookie(
|
|
mbedtls_ssl_cookie_write_t *f_cookie_write,
|
|
mbedtls_ssl_cookie_check_t *f_cookie_check,
|
|
void *p_cookie,
|
|
const unsigned char *cli_id, size_t cli_id_len,
|
|
const unsigned char *in, size_t in_len,
|
|
unsigned char *obuf, size_t buf_len, size_t *olen )
|
|
{
|
|
size_t sid_len, cookie_len;
|
|
unsigned char *p;
|
|
|
|
if( f_cookie_write == NULL || f_cookie_check == NULL )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
/*
|
|
* Structure of ClientHello with record and handshake headers,
|
|
* and expected values. We don't need to check a lot, more checks will be
|
|
* done when actually parsing the ClientHello - skipping those checks
|
|
* avoids code duplication and does not make cookie forging any easier.
|
|
*
|
|
* 0-0 ContentType type; copied, must be handshake
|
|
* 1-2 ProtocolVersion version; copied
|
|
* 3-4 uint16 epoch; copied, must be 0
|
|
* 5-10 uint48 sequence_number; copied
|
|
* 11-12 uint16 length; (ignored)
|
|
*
|
|
* 13-13 HandshakeType msg_type; (ignored)
|
|
* 14-16 uint24 length; (ignored)
|
|
* 17-18 uint16 message_seq; copied
|
|
* 19-21 uint24 fragment_offset; copied, must be 0
|
|
* 22-24 uint24 fragment_length; (ignored)
|
|
*
|
|
* 25-26 ProtocolVersion client_version; (ignored)
|
|
* 27-58 Random random; (ignored)
|
|
* 59-xx SessionID session_id; 1 byte len + sid_len content
|
|
* 60+ opaque cookie<0..2^8-1>; 1 byte len + content
|
|
* ...
|
|
*
|
|
* Minimum length is 61 bytes.
|
|
*/
|
|
if( in_len < 61 ||
|
|
in[0] != MBEDTLS_SSL_MSG_HANDSHAKE ||
|
|
in[3] != 0 || in[4] != 0 ||
|
|
in[19] != 0 || in[20] != 0 || in[21] != 0 )
|
|
{
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
sid_len = in[59];
|
|
if( sid_len > in_len - 61 )
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
|
|
cookie_len = in[60 + sid_len];
|
|
if( cookie_len > in_len - 60 )
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
|
|
if( f_cookie_check( p_cookie, in + sid_len + 61, cookie_len,
|
|
cli_id, cli_id_len ) == 0 )
|
|
{
|
|
/* Valid cookie */
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* If we get here, we've got an invalid cookie, let's prepare HVR.
|
|
*
|
|
* 0-0 ContentType type; copied
|
|
* 1-2 ProtocolVersion version; copied
|
|
* 3-4 uint16 epoch; copied
|
|
* 5-10 uint48 sequence_number; copied
|
|
* 11-12 uint16 length; olen - 13
|
|
*
|
|
* 13-13 HandshakeType msg_type; hello_verify_request
|
|
* 14-16 uint24 length; olen - 25
|
|
* 17-18 uint16 message_seq; copied
|
|
* 19-21 uint24 fragment_offset; copied
|
|
* 22-24 uint24 fragment_length; olen - 25
|
|
*
|
|
* 25-26 ProtocolVersion server_version; 0xfe 0xff
|
|
* 27-27 opaque cookie<0..2^8-1>; cookie_len = olen - 27, cookie
|
|
*
|
|
* Minimum length is 28.
|
|
*/
|
|
if( buf_len < 28 )
|
|
return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
|
|
|
|
/* Copy most fields and adapt others */
|
|
memcpy( obuf, in, 25 );
|
|
obuf[13] = MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST;
|
|
obuf[25] = 0xfe;
|
|
obuf[26] = 0xff;
|
|
|
|
/* Generate and write actual cookie */
|
|
p = obuf + 28;
|
|
if( f_cookie_write( p_cookie,
|
|
&p, obuf + buf_len, cli_id, cli_id_len ) != 0 )
|
|
{
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
*olen = p - obuf;
|
|
|
|
/* Go back and fill length fields */
|
|
obuf[27] = (unsigned char)( *olen - 28 );
|
|
|
|
obuf[14] = obuf[22] = (unsigned char)( ( *olen - 25 ) >> 16 );
|
|
obuf[15] = obuf[23] = (unsigned char)( ( *olen - 25 ) >> 8 );
|
|
obuf[16] = obuf[24] = (unsigned char)( ( *olen - 25 ) );
|
|
|
|
obuf[11] = (unsigned char)( ( *olen - 13 ) >> 8 );
|
|
obuf[12] = (unsigned char)( ( *olen - 13 ) );
|
|
|
|
return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED );
|
|
}
|
|
|
|
/*
|
|
* Handle possible client reconnect with the same UDP quadruplet
|
|
* (RFC 6347 Section 4.2.8).
|
|
*
|
|
* Called by ssl_parse_record_header() in case we receive an epoch 0 record
|
|
* that looks like a ClientHello.
|
|
*
|
|
* - if the input looks like a ClientHello without cookies,
|
|
* send back HelloVerifyRequest, then
|
|
* return MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED
|
|
* - if the input looks like a ClientHello with a valid cookie,
|
|
* reset the session of the current context, and
|
|
* return MBEDTLS_ERR_SSL_CLIENT_RECONNECT
|
|
* - if anything goes wrong, return a specific error code
|
|
*
|
|
* mbedtls_ssl_read_record() will ignore the record if anything else than
|
|
* MBEDTLS_ERR_SSL_CLIENT_RECONNECT or 0 is returned, although this function
|
|
* cannot not return 0.
|
|
*/
|
|
static int ssl_handle_possible_reconnect( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
size_t len;
|
|
|
|
ret = ssl_check_dtls_clihlo_cookie(
|
|
ssl->conf->f_cookie_write,
|
|
ssl->conf->f_cookie_check,
|
|
ssl->conf->p_cookie,
|
|
ssl->cli_id, ssl->cli_id_len,
|
|
ssl->in_buf, ssl->in_left,
|
|
ssl->out_buf, MBEDTLS_SSL_MAX_CONTENT_LEN, &len );
|
|
|
|
MBEDTLS_SSL_DEBUG_RET( 2, "ssl_check_dtls_clihlo_cookie", ret );
|
|
|
|
if( ret == MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED )
|
|
{
|
|
/* Don't check write errors as we can't do anything here.
|
|
* If the error is permanent we'll catch it later,
|
|
* if it's not, then hopefully it'll work next time. */
|
|
(void) ssl->f_send( ssl->p_bio, ssl->out_buf, len );
|
|
|
|
return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED );
|
|
}
|
|
|
|
if( ret == 0 )
|
|
{
|
|
/* Got a valid cookie, partially reset context */
|
|
if( ( ret = ssl_session_reset_int( ssl, 1 ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "reset", ret );
|
|
return( ret );
|
|
}
|
|
|
|
return( MBEDTLS_ERR_SSL_CLIENT_RECONNECT );
|
|
}
|
|
|
|
return( ret );
|
|
}
|
|
#endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */
|
|
|
|
/*
|
|
* ContentType type;
|
|
* ProtocolVersion version;
|
|
* uint16 epoch; // DTLS only
|
|
* uint48 sequence_number; // DTLS only
|
|
* uint16 length;
|
|
*
|
|
* Return 0 if header looks sane (and, for DTLS, the record is expected)
|
|
* MBEDTLS_ERR_SSL_INVALID_RECORD if the header looks bad,
|
|
* MBEDTLS_ERR_SSL_UNEXPECTED_RECORD (DTLS only) if sane but unexpected.
|
|
*
|
|
* With DTLS, mbedtls_ssl_read_record() will:
|
|
* 1. proceed with the record if this function returns 0
|
|
* 2. drop only the current record if this function returns UNEXPECTED_RECORD
|
|
* 3. return CLIENT_RECONNECT if this function return that value
|
|
* 4. drop the whole datagram if this function returns anything else.
|
|
* Point 2 is needed when the peer is resending, and we have already received
|
|
* the first record from a datagram but are still waiting for the others.
|
|
*/
|
|
static int ssl_parse_record_header( mbedtls_ssl_context *ssl )
|
|
{
|
|
int major_ver, minor_ver;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "input record header", ssl->in_hdr, mbedtls_ssl_hdr_len( ssl ) );
|
|
|
|
ssl->in_msgtype = ssl->in_hdr[0];
|
|
ssl->in_msglen = ( ssl->in_len[0] << 8 ) | ssl->in_len[1];
|
|
mbedtls_ssl_read_version( &major_ver, &minor_ver, ssl->conf->transport, ssl->in_hdr + 1 );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "input record: msgtype = %d, "
|
|
"version = [%d:%d], msglen = %d",
|
|
ssl->in_msgtype,
|
|
major_ver, minor_ver, ssl->in_msglen ) );
|
|
|
|
/* Check record type */
|
|
if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE &&
|
|
ssl->in_msgtype != MBEDTLS_SSL_MSG_ALERT &&
|
|
ssl->in_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC &&
|
|
ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "unknown record type" ) );
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
/* Silently ignore invalid DTLS records as recommended by RFC 6347
|
|
* Section 4.1.2.7 */
|
|
if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
#endif /* MBEDTLS_SSL_PROTO_DTLS */
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
|
|
|
|
return( MBEDTLS_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
|
|
/* Check version */
|
|
if( major_ver != ssl->major_ver )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "major version mismatch" ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
|
|
if( minor_ver > ssl->conf->max_minor_ver )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "minor version mismatch" ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
|
|
/* Check length against the size of our buffer */
|
|
if( ssl->in_msglen > MBEDTLS_SSL_BUFFER_LEN
|
|
- (size_t)( ssl->in_msg - ssl->in_buf ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
|
|
/*
|
|
* DTLS-related tests.
|
|
* Check epoch before checking length constraint because
|
|
* the latter varies with the epoch. E.g., if a ChangeCipherSpec
|
|
* message gets duplicated before the corresponding Finished message,
|
|
* the second ChangeCipherSpec should be discarded because it belongs
|
|
* to an old epoch, but not because its length is shorter than
|
|
* the minimum record length for packets using the new record transform.
|
|
* Note that these two kinds of failures are handled differently,
|
|
* as an unexpected record is silently skipped but an invalid
|
|
* record leads to the entire datagram being dropped.
|
|
*/
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
{
|
|
unsigned int rec_epoch = ( ssl->in_ctr[0] << 8 ) | ssl->in_ctr[1];
|
|
|
|
/* Check epoch (and sequence number) with DTLS */
|
|
if( rec_epoch != ssl->in_epoch )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "record from another epoch: "
|
|
"expected %d, received %d",
|
|
ssl->in_epoch, rec_epoch ) );
|
|
|
|
#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C)
|
|
/*
|
|
* Check for an epoch 0 ClientHello. We can't use in_msg here to
|
|
* access the first byte of record content (handshake type), as we
|
|
* have an active transform (possibly iv_len != 0), so use the
|
|
* fact that the record header len is 13 instead.
|
|
*/
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
|
|
ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER &&
|
|
rec_epoch == 0 &&
|
|
ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
|
|
ssl->in_left > 13 &&
|
|
ssl->in_buf[13] == MBEDTLS_SSL_HS_CLIENT_HELLO )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "possible client reconnect "
|
|
"from the same port" ) );
|
|
return( ssl_handle_possible_reconnect( ssl ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */
|
|
return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
|
|
/* Replay detection only works for the current epoch */
|
|
if( rec_epoch == ssl->in_epoch &&
|
|
mbedtls_ssl_dtls_replay_check( ssl ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "replayed record" ) );
|
|
return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
|
|
}
|
|
#endif
|
|
|
|
/* Drop unexpected ChangeCipherSpec messages */
|
|
if( ssl->in_msgtype == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC &&
|
|
ssl->state != MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC &&
|
|
ssl->state != MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "dropping unexpected ChangeCipherSpec" ) );
|
|
return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
|
|
}
|
|
|
|
/* Drop unexpected ApplicationData records,
|
|
* except at the beginning of renegotiations */
|
|
if( ssl->in_msgtype == MBEDTLS_SSL_MSG_APPLICATION_DATA &&
|
|
ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
&& ! ( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
|
|
ssl->state == MBEDTLS_SSL_SERVER_HELLO )
|
|
#endif
|
|
)
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "dropping unexpected ApplicationData" ) );
|
|
return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_DTLS */
|
|
|
|
|
|
/* Check length against bounds of the current transform and version */
|
|
if( ssl->transform_in == NULL )
|
|
{
|
|
if( ssl->in_msglen < 1 ||
|
|
ssl->in_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if( ssl->in_msglen < ssl->transform_in->minlen )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 &&
|
|
ssl->in_msglen > ssl->transform_in->minlen + MBEDTLS_SSL_MAX_CONTENT_LEN )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
#endif
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
/*
|
|
* TLS encrypted messages can have up to 256 bytes of padding
|
|
*/
|
|
if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 &&
|
|
ssl->in_msglen > ssl->transform_in->minlen +
|
|
MBEDTLS_SSL_MAX_CONTENT_LEN + 256 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
#endif
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* If applicable, decrypt (and decompress) record content
|
|
*/
|
|
static int ssl_prepare_record_content( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret, done = 0;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "input record from network",
|
|
ssl->in_hdr, mbedtls_ssl_hdr_len( ssl ) + ssl->in_msglen );
|
|
|
|
#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
|
|
if( mbedtls_ssl_hw_record_read != NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_read()" ) );
|
|
|
|
ret = mbedtls_ssl_hw_record_read( ssl );
|
|
if( ret != 0 && ret != MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_read", ret );
|
|
return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
|
|
}
|
|
|
|
if( ret == 0 )
|
|
done = 1;
|
|
}
|
|
#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
|
|
if( !done && ssl->transform_in != NULL )
|
|
{
|
|
if( ( ret = ssl_decrypt_buf( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_decrypt_buf", ret );
|
|
return( ret );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "input payload after decrypt",
|
|
ssl->in_msg, ssl->in_msglen );
|
|
|
|
if( ssl->in_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
}
|
|
|
|
#if defined(MBEDTLS_ZLIB_SUPPORT)
|
|
if( ssl->transform_in != NULL &&
|
|
ssl->session_in->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
|
|
{
|
|
if( ( ret = ssl_decompress_buf( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_decompress_buf", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_ZLIB_SUPPORT */
|
|
|
|
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
{
|
|
mbedtls_ssl_dtls_replay_update( ssl );
|
|
}
|
|
#endif
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static void ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl );
|
|
|
|
/*
|
|
* Read a record.
|
|
*
|
|
* Silently ignore non-fatal alert (and for DTLS, invalid records as well,
|
|
* RFC 6347 4.1.2.7) and continue reading until a valid record is found.
|
|
*
|
|
*/
|
|
int mbedtls_ssl_read_record( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read record" ) );
|
|
|
|
if( ssl->keep_current_message == 0 )
|
|
{
|
|
do {
|
|
|
|
if( ( ret = mbedtls_ssl_read_record_layer( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_read_record_layer" ), ret );
|
|
return( ret );
|
|
}
|
|
|
|
ret = mbedtls_ssl_handle_message_type( ssl );
|
|
|
|
} while( MBEDTLS_ERR_SSL_NON_FATAL == ret );
|
|
|
|
if( 0 != ret )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_read_record_layer" ), ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
|
|
{
|
|
mbedtls_ssl_update_handshake_status( ssl );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= reuse previously read message" ) );
|
|
ssl->keep_current_message = 0;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read record" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_ssl_read_record_layer( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* Step A
|
|
*
|
|
* Consume last content-layer message and potentially
|
|
* update in_msglen which keeps track of the contents'
|
|
* consumption state.
|
|
*
|
|
* (1) Handshake messages:
|
|
* Remove last handshake message, move content
|
|
* and adapt in_msglen.
|
|
*
|
|
* (2) Alert messages:
|
|
* Consume whole record content, in_msglen = 0.
|
|
*
|
|
* NOTE: This needs to be fixed, since like for
|
|
* handshake messages it is allowed to have
|
|
* multiple alerts witin a single record.
|
|
* Internal reference IOTSSL-1321.
|
|
*
|
|
* (3) Change cipher spec:
|
|
* Consume whole record content, in_msglen = 0.
|
|
*
|
|
* (4) Application data:
|
|
* Don't do anything - the record layer provides
|
|
* the application data as a stream transport
|
|
* and consumes through mbedtls_ssl_read only.
|
|
*
|
|
*/
|
|
|
|
/* Case (1): Handshake messages */
|
|
if( ssl->in_hslen != 0 )
|
|
{
|
|
/* Hard assertion to be sure that no application data
|
|
* is in flight, as corrupting ssl->in_msglen during
|
|
* ssl->in_offt != NULL is fatal. */
|
|
if( ssl->in_offt != NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
/*
|
|
* Get next Handshake message in the current record
|
|
*/
|
|
|
|
/* Notes:
|
|
* (1) in_hslen is *NOT* necessarily the size of the
|
|
* current handshake content: If DTLS handshake
|
|
* fragmentation is used, that's the fragment
|
|
* size instead. Using the total handshake message
|
|
* size here is FAULTY and should be changed at
|
|
* some point. Internal reference IOTSSL-1414.
|
|
* (2) While it doesn't seem to cause problems, one
|
|
* has to be very careful not to assume that in_hslen
|
|
* is always <= in_msglen in a sensible communication.
|
|
* Again, it's wrong for DTLS handshake fragmentation.
|
|
* The following check is therefore mandatory, and
|
|
* should not be treated as a silently corrected assertion.
|
|
* Additionally, ssl->in_hslen might be arbitrarily out of
|
|
* bounds after handling a DTLS message with an unexpected
|
|
* sequence number, see mbedtls_ssl_prepare_handshake_record.
|
|
*/
|
|
if( ssl->in_hslen < ssl->in_msglen )
|
|
{
|
|
ssl->in_msglen -= ssl->in_hslen;
|
|
memmove( ssl->in_msg, ssl->in_msg + ssl->in_hslen,
|
|
ssl->in_msglen );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "remaining content in record",
|
|
ssl->in_msg, ssl->in_msglen );
|
|
}
|
|
else
|
|
{
|
|
ssl->in_msglen = 0;
|
|
}
|
|
|
|
ssl->in_hslen = 0;
|
|
}
|
|
/* Case (4): Application data */
|
|
else if( ssl->in_offt != NULL )
|
|
{
|
|
return( 0 );
|
|
}
|
|
/* Everything else (CCS & Alerts) */
|
|
else
|
|
{
|
|
ssl->in_msglen = 0;
|
|
}
|
|
|
|
/*
|
|
* Step B
|
|
*
|
|
* Fetch and decode new record if current one is fully consumed.
|
|
*
|
|
*/
|
|
|
|
if( ssl->in_msglen > 0 )
|
|
{
|
|
/* There's something left to be processed in the current record. */
|
|
return( 0 );
|
|
}
|
|
|
|
/* Need to fetch a new record */
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
read_record_header:
|
|
#endif
|
|
|
|
/* Current record either fully processed or to be discarded. */
|
|
|
|
if( ( ret = mbedtls_ssl_fetch_input( ssl, mbedtls_ssl_hdr_len( ssl ) ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = ssl_parse_record_header( ssl ) ) != 0 )
|
|
{
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
|
|
ret != MBEDTLS_ERR_SSL_CLIENT_RECONNECT )
|
|
{
|
|
if( ret == MBEDTLS_ERR_SSL_UNEXPECTED_RECORD )
|
|
{
|
|
/* Skip unexpected record (but not whole datagram) */
|
|
ssl->next_record_offset = ssl->in_msglen
|
|
+ mbedtls_ssl_hdr_len( ssl );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding unexpected record "
|
|
"(header)" ) );
|
|
}
|
|
else
|
|
{
|
|
/* Skip invalid record and the rest of the datagram */
|
|
ssl->next_record_offset = 0;
|
|
ssl->in_left = 0;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding invalid record "
|
|
"(header)" ) );
|
|
}
|
|
|
|
/* Get next record */
|
|
goto read_record_header;
|
|
}
|
|
#endif
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* Read and optionally decrypt the message contents
|
|
*/
|
|
if( ( ret = mbedtls_ssl_fetch_input( ssl,
|
|
mbedtls_ssl_hdr_len( ssl ) + ssl->in_msglen ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
|
|
return( ret );
|
|
}
|
|
|
|
/* Done reading this record, get ready for the next one */
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
ssl->next_record_offset = ssl->in_msglen + mbedtls_ssl_hdr_len( ssl );
|
|
else
|
|
#endif
|
|
ssl->in_left = 0;
|
|
|
|
if( ( ret = ssl_prepare_record_content( ssl ) ) != 0 )
|
|
{
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
{
|
|
/* Silently discard invalid records */
|
|
if( ret == MBEDTLS_ERR_SSL_INVALID_RECORD ||
|
|
ret == MBEDTLS_ERR_SSL_INVALID_MAC )
|
|
{
|
|
/* Except when waiting for Finished as a bad mac here
|
|
* probably means something went wrong in the handshake
|
|
* (eg wrong psk used, mitm downgrade attempt, etc.) */
|
|
if( ssl->state == MBEDTLS_SSL_CLIENT_FINISHED ||
|
|
ssl->state == MBEDTLS_SSL_SERVER_FINISHED )
|
|
{
|
|
#if defined(MBEDTLS_SSL_ALL_ALERT_MESSAGES)
|
|
if( ret == MBEDTLS_ERR_SSL_INVALID_MAC )
|
|
{
|
|
mbedtls_ssl_send_alert_message( ssl,
|
|
MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC );
|
|
}
|
|
#endif
|
|
return( ret );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
|
|
if( ssl->conf->badmac_limit != 0 &&
|
|
++ssl->badmac_seen >= ssl->conf->badmac_limit )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "too many records with bad MAC" ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_MAC );
|
|
}
|
|
#endif
|
|
|
|
/* As above, invalid records cause
|
|
* dismissal of the whole datagram. */
|
|
|
|
ssl->next_record_offset = 0;
|
|
ssl->in_left = 0;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding invalid record (mac)" ) );
|
|
goto read_record_header;
|
|
}
|
|
|
|
return( ret );
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
/* Error out (and send alert) on invalid records */
|
|
#if defined(MBEDTLS_SSL_ALL_ALERT_MESSAGES)
|
|
if( ret == MBEDTLS_ERR_SSL_INVALID_MAC )
|
|
{
|
|
mbedtls_ssl_send_alert_message( ssl,
|
|
MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC );
|
|
}
|
|
#endif
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
/*
|
|
* When we sent the last flight of the handshake, we MUST respond to a
|
|
* retransmit of the peer's previous flight with a retransmit. (In
|
|
* practice, only the Finished message will make it, other messages
|
|
* including CCS use the old transform so they're dropped as invalid.)
|
|
*
|
|
* If the record we received is not a handshake message, however, it
|
|
* means the peer received our last flight so we can clean up
|
|
* handshake info.
|
|
*
|
|
* This check needs to be done before prepare_handshake() due to an edge
|
|
* case: if the client immediately requests renegotiation, this
|
|
* finishes the current handshake first, avoiding the new ClientHello
|
|
* being mistaken for an ancient message in the current handshake.
|
|
*/
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
|
|
ssl->handshake != NULL &&
|
|
ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
|
|
{
|
|
if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
|
|
ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "received retransmit of last flight" ) );
|
|
|
|
if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret );
|
|
return( ret );
|
|
}
|
|
|
|
return( MBEDTLS_ERR_SSL_WANT_READ );
|
|
}
|
|
else
|
|
{
|
|
ssl_handshake_wrapup_free_hs_transform( ssl );
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_ssl_handle_message_type( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* Handle particular types of records
|
|
*/
|
|
if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
|
|
{
|
|
if( ( ret = mbedtls_ssl_prepare_handshake_record( ssl ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT )
|
|
{
|
|
if( ssl->in_msglen != 2 )
|
|
{
|
|
/* Note: Standard allows for more than one 2 byte alert
|
|
to be packed in a single message, but Mbed TLS doesn't
|
|
currently support this. */
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid alert message, len: %d",
|
|
ssl->in_msglen ) );
|
|
return( MBEDTLS_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "got an alert message, type: [%d:%d]",
|
|
ssl->in_msg[0], ssl->in_msg[1] ) );
|
|
|
|
/*
|
|
* Ignore non-fatal alerts, except close_notify and no_renegotiation
|
|
*/
|
|
if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_FATAL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "is a fatal alert message (msg %d)",
|
|
ssl->in_msg[1] ) );
|
|
return( MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE );
|
|
}
|
|
|
|
if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
|
|
ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a close notify message" ) );
|
|
return( MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION_ENABLED)
|
|
if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
|
|
ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a SSLv3 no_cert" ) );
|
|
/* Will be handled when trying to parse ServerHello */
|
|
return( 0 );
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_SRV_C)
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 &&
|
|
ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
|
|
ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
|
|
ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a SSLv3 no_cert" ) );
|
|
/* Will be handled in mbedtls_ssl_parse_certificate() */
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_SSL3 && MBEDTLS_SSL_SRV_C */
|
|
|
|
/* Silently ignore: fetch new message */
|
|
return MBEDTLS_ERR_SSL_NON_FATAL;
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_ssl_send_fatal_handshake_failure( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
if( ( ret = mbedtls_ssl_send_alert_message( ssl,
|
|
MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_ssl_send_alert_message( mbedtls_ssl_context *ssl,
|
|
unsigned char level,
|
|
unsigned char message )
|
|
{
|
|
int ret;
|
|
|
|
if( ssl == NULL || ssl->conf == NULL )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> send alert message" ) );
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "send alert level=%u message=%u", level, message ));
|
|
|
|
ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT;
|
|
ssl->out_msglen = 2;
|
|
ssl->out_msg[0] = level;
|
|
ssl->out_msg[1] = message;
|
|
|
|
if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
|
|
return( ret );
|
|
}
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= send alert message" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Handshake functions
|
|
*/
|
|
#if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \
|
|
!defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) && \
|
|
!defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
|
|
!defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \
|
|
!defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) && \
|
|
!defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \
|
|
!defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
|
|
/* No certificate support -> dummy functions */
|
|
int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl )
|
|
{
|
|
const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
|
|
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
|
|
ssl->state++;
|
|
return( 0 );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl )
|
|
{
|
|
const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
|
|
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
|
|
ssl->state++;
|
|
return( 0 );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
#else
|
|
/* Some certificate support -> implement write and parse */
|
|
|
|
int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
|
|
size_t i, n;
|
|
const mbedtls_x509_crt *crt;
|
|
const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
|
|
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
|
|
ssl->state++;
|
|
return( 0 );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_CLI_C)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
|
|
{
|
|
if( ssl->client_auth == 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
|
|
ssl->state++;
|
|
return( 0 );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
/*
|
|
* If using SSLv3 and got no cert, send an Alert message
|
|
* (otherwise an empty Certificate message will be sent).
|
|
*/
|
|
if( mbedtls_ssl_own_cert( ssl ) == NULL &&
|
|
ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
|
|
{
|
|
ssl->out_msglen = 2;
|
|
ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT;
|
|
ssl->out_msg[0] = MBEDTLS_SSL_ALERT_LEVEL_WARNING;
|
|
ssl->out_msg[1] = MBEDTLS_SSL_ALERT_MSG_NO_CERT;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "got no certificate to send" ) );
|
|
goto write_msg;
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_SSL3 */
|
|
}
|
|
#endif /* MBEDTLS_SSL_CLI_C */
|
|
#if defined(MBEDTLS_SSL_SRV_C)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
|
|
{
|
|
if( mbedtls_ssl_own_cert( ssl ) == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no certificate to send" ) );
|
|
return( MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED );
|
|
}
|
|
}
|
|
#endif
|
|
|
|
MBEDTLS_SSL_DEBUG_CRT( 3, "own certificate", mbedtls_ssl_own_cert( ssl ) );
|
|
|
|
/*
|
|
* 0 . 0 handshake type
|
|
* 1 . 3 handshake length
|
|
* 4 . 6 length of all certs
|
|
* 7 . 9 length of cert. 1
|
|
* 10 . n-1 peer certificate
|
|
* n . n+2 length of cert. 2
|
|
* n+3 . ... upper level cert, etc.
|
|
*/
|
|
i = 7;
|
|
crt = mbedtls_ssl_own_cert( ssl );
|
|
|
|
while( crt != NULL )
|
|
{
|
|
n = crt->raw.len;
|
|
if( n > MBEDTLS_SSL_MAX_CONTENT_LEN - 3 - i )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate too large, %d > %d",
|
|
i + 3 + n, MBEDTLS_SSL_MAX_CONTENT_LEN ) );
|
|
return( MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE );
|
|
}
|
|
|
|
ssl->out_msg[i ] = (unsigned char)( n >> 16 );
|
|
ssl->out_msg[i + 1] = (unsigned char)( n >> 8 );
|
|
ssl->out_msg[i + 2] = (unsigned char)( n );
|
|
|
|
i += 3; memcpy( ssl->out_msg + i, crt->raw.p, n );
|
|
i += n; crt = crt->next;
|
|
}
|
|
|
|
ssl->out_msg[4] = (unsigned char)( ( i - 7 ) >> 16 );
|
|
ssl->out_msg[5] = (unsigned char)( ( i - 7 ) >> 8 );
|
|
ssl->out_msg[6] = (unsigned char)( ( i - 7 ) );
|
|
|
|
ssl->out_msglen = i;
|
|
ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
|
|
ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE;
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_CLI_C)
|
|
write_msg:
|
|
#endif
|
|
|
|
ssl->state++;
|
|
|
|
if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate" ) );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
|
|
size_t i, n;
|
|
const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
|
|
int authmode = ssl->conf->authmode;
|
|
uint8_t alert;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
|
|
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
|
|
ssl->state++;
|
|
return( 0 );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_SRV_C)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
|
|
ssl->state++;
|
|
return( 0 );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
|
|
if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET )
|
|
authmode = ssl->handshake->sni_authmode;
|
|
#endif
|
|
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
|
|
authmode == MBEDTLS_SSL_VERIFY_NONE )
|
|
{
|
|
ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_SKIP_VERIFY;
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
|
|
ssl->state++;
|
|
return( 0 );
|
|
}
|
|
#endif
|
|
|
|
if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
|
|
{
|
|
/* mbedtls_ssl_read_record may have sent an alert already. We
|
|
let it decide whether to alert. */
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
ssl->state++;
|
|
|
|
#if defined(MBEDTLS_SSL_SRV_C)
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
/*
|
|
* Check if the client sent an empty certificate
|
|
*/
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
|
|
ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
|
|
{
|
|
if( ssl->in_msglen == 2 &&
|
|
ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT &&
|
|
ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
|
|
ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "SSLv3 client has no certificate" ) );
|
|
|
|
/* The client was asked for a certificate but didn't send
|
|
one. The client should know what's going on, so we
|
|
don't send an alert. */
|
|
ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING;
|
|
if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL )
|
|
return( 0 );
|
|
else
|
|
return( MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE );
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_SSL3 */
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
|
|
ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 )
|
|
{
|
|
if( ssl->in_hslen == 3 + mbedtls_ssl_hs_hdr_len( ssl ) &&
|
|
ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
|
|
ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE &&
|
|
memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ), "\0\0\0", 3 ) == 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLSv1 client has no certificate" ) );
|
|
|
|
/* The client was asked for a certificate but didn't send
|
|
one. The client should know what's going on, so we
|
|
don't send an alert. */
|
|
ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING;
|
|
if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL )
|
|
return( 0 );
|
|
else
|
|
return( MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE );
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
|
|
MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
#endif /* MBEDTLS_SSL_SRV_C */
|
|
|
|
if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
|
|
return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
|
|
}
|
|
|
|
if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE ||
|
|
ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 3 + 3 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
|
|
}
|
|
|
|
i = mbedtls_ssl_hs_hdr_len( ssl );
|
|
|
|
/*
|
|
* Same message structure as in mbedtls_ssl_write_certificate()
|
|
*/
|
|
n = ( ssl->in_msg[i+1] << 8 ) | ssl->in_msg[i+2];
|
|
|
|
if( ssl->in_msg[i] != 0 ||
|
|
ssl->in_hslen != n + 3 + mbedtls_ssl_hs_hdr_len( ssl ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
|
|
}
|
|
|
|
/* In case we tried to reuse a session but it failed */
|
|
if( ssl->session_negotiate->peer_cert != NULL )
|
|
{
|
|
mbedtls_x509_crt_free( ssl->session_negotiate->peer_cert );
|
|
mbedtls_free( ssl->session_negotiate->peer_cert );
|
|
}
|
|
|
|
if( ( ssl->session_negotiate->peer_cert = mbedtls_calloc( 1,
|
|
sizeof( mbedtls_x509_crt ) ) ) == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed",
|
|
sizeof( mbedtls_x509_crt ) ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
|
|
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
|
|
}
|
|
|
|
mbedtls_x509_crt_init( ssl->session_negotiate->peer_cert );
|
|
|
|
i += 3;
|
|
|
|
while( i < ssl->in_hslen )
|
|
{
|
|
if ( i + 3 > ssl->in_hslen ) {
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
|
|
}
|
|
if( ssl->in_msg[i] != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
|
|
}
|
|
|
|
n = ( (unsigned int) ssl->in_msg[i + 1] << 8 )
|
|
| (unsigned int) ssl->in_msg[i + 2];
|
|
i += 3;
|
|
|
|
if( n < 128 || i + n > ssl->in_hslen )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
|
|
}
|
|
|
|
ret = mbedtls_x509_crt_parse_der( ssl->session_negotiate->peer_cert,
|
|
ssl->in_msg + i, n );
|
|
switch( ret )
|
|
{
|
|
case 0: /*ok*/
|
|
case MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + MBEDTLS_ERR_OID_NOT_FOUND:
|
|
/* Ignore certificate with an unknown algorithm: maybe a
|
|
prior certificate was already trusted. */
|
|
break;
|
|
|
|
case MBEDTLS_ERR_X509_ALLOC_FAILED:
|
|
alert = MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR;
|
|
goto crt_parse_der_failed;
|
|
|
|
case MBEDTLS_ERR_X509_UNKNOWN_VERSION:
|
|
alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
|
|
goto crt_parse_der_failed;
|
|
|
|
default:
|
|
alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT;
|
|
crt_parse_der_failed:
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, alert );
|
|
MBEDTLS_SSL_DEBUG_RET( 1, " mbedtls_x509_crt_parse_der", ret );
|
|
return( ret );
|
|
}
|
|
|
|
i += n;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_CRT( 3, "peer certificate", ssl->session_negotiate->peer_cert );
|
|
|
|
/*
|
|
* On client, make sure the server cert doesn't change during renego to
|
|
* avoid "triple handshake" attack: https://secure-resumption.com/
|
|
*/
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
|
|
ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
|
|
{
|
|
if( ssl->session->peer_cert == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "new server cert during renegotiation" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
|
|
}
|
|
|
|
if( ssl->session->peer_cert->raw.len !=
|
|
ssl->session_negotiate->peer_cert->raw.len ||
|
|
memcmp( ssl->session->peer_cert->raw.p,
|
|
ssl->session_negotiate->peer_cert->raw.p,
|
|
ssl->session->peer_cert->raw.len ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "server cert changed during renegotiation" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */
|
|
|
|
if( authmode != MBEDTLS_SSL_VERIFY_NONE )
|
|
{
|
|
mbedtls_x509_crt *ca_chain;
|
|
mbedtls_x509_crl *ca_crl;
|
|
|
|
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
|
|
if( ssl->handshake->sni_ca_chain != NULL )
|
|
{
|
|
ca_chain = ssl->handshake->sni_ca_chain;
|
|
ca_crl = ssl->handshake->sni_ca_crl;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
ca_chain = ssl->conf->ca_chain;
|
|
ca_crl = ssl->conf->ca_crl;
|
|
}
|
|
|
|
/*
|
|
* Main check: verify certificate
|
|
*/
|
|
ret = mbedtls_x509_crt_verify_with_profile(
|
|
ssl->session_negotiate->peer_cert,
|
|
ca_chain, ca_crl,
|
|
ssl->conf->cert_profile,
|
|
ssl->hostname,
|
|
&ssl->session_negotiate->verify_result,
|
|
ssl->conf->f_vrfy, ssl->conf->p_vrfy );
|
|
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "x509_verify_cert", ret );
|
|
}
|
|
|
|
/*
|
|
* Secondary checks: always done, but change 'ret' only if it was 0
|
|
*/
|
|
|
|
#if defined(MBEDTLS_ECP_C)
|
|
{
|
|
const mbedtls_pk_context *pk = &ssl->session_negotiate->peer_cert->pk;
|
|
|
|
/* If certificate uses an EC key, make sure the curve is OK */
|
|
if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECKEY ) &&
|
|
mbedtls_ssl_check_curve( ssl, mbedtls_pk_ec( *pk )->grp.id ) != 0 )
|
|
{
|
|
ssl->session_negotiate->verify_result |= MBEDTLS_X509_BADCERT_BAD_KEY;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (EC key curve)" ) );
|
|
if( ret == 0 )
|
|
ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_ECP_C */
|
|
|
|
if( mbedtls_ssl_check_cert_usage( ssl->session_negotiate->peer_cert,
|
|
ciphersuite_info,
|
|
! ssl->conf->endpoint,
|
|
&ssl->session_negotiate->verify_result ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (usage extensions)" ) );
|
|
if( ret == 0 )
|
|
ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
|
|
}
|
|
|
|
/* mbedtls_x509_crt_verify_with_profile is supposed to report a
|
|
* verification failure through MBEDTLS_ERR_X509_CERT_VERIFY_FAILED,
|
|
* with details encoded in the verification flags. All other kinds
|
|
* of error codes, including those from the user provided f_vrfy
|
|
* functions, are treated as fatal and lead to a failure of
|
|
* ssl_parse_certificate even if verification was optional. */
|
|
if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL &&
|
|
( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED ||
|
|
ret == MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ) )
|
|
{
|
|
ret = 0;
|
|
}
|
|
|
|
if( ca_chain == NULL && authmode == MBEDTLS_SSL_VERIFY_REQUIRED )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no CA chain" ) );
|
|
ret = MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED;
|
|
}
|
|
|
|
if( ret != 0 )
|
|
{
|
|
/* The certificate may have been rejected for several reasons.
|
|
Pick one and send the corresponding alert. Which alert to send
|
|
may be a subject of debate in some cases. */
|
|
if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_OTHER )
|
|
alert = MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED;
|
|
else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_CN_MISMATCH )
|
|
alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT;
|
|
else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_KEY_USAGE )
|
|
alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
|
|
else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXT_KEY_USAGE )
|
|
alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
|
|
else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NS_CERT_TYPE )
|
|
alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
|
|
else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_PK )
|
|
alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
|
|
else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_KEY )
|
|
alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
|
|
else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXPIRED )
|
|
alert = MBEDTLS_SSL_ALERT_MSG_CERT_EXPIRED;
|
|
else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_REVOKED )
|
|
alert = MBEDTLS_SSL_ALERT_MSG_CERT_REVOKED;
|
|
else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NOT_TRUSTED )
|
|
alert = MBEDTLS_SSL_ALERT_MSG_UNKNOWN_CA;
|
|
else
|
|
alert = MBEDTLS_SSL_ALERT_MSG_CERT_UNKNOWN;
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
alert );
|
|
}
|
|
|
|
#if defined(MBEDTLS_DEBUG_C)
|
|
if( ssl->session_negotiate->verify_result != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "! Certificate verification flags %x",
|
|
ssl->session_negotiate->verify_result ) );
|
|
}
|
|
else
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "Certificate verification flags clear" ) );
|
|
}
|
|
#endif /* MBEDTLS_DEBUG_C */
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) );
|
|
|
|
return( ret );
|
|
}
|
|
#endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED
|
|
!MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED
|
|
!MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED
|
|
!MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED
|
|
!MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED
|
|
!MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED
|
|
!MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
|
|
|
|
int mbedtls_ssl_write_change_cipher_spec( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write change cipher spec" ) );
|
|
|
|
ssl->out_msgtype = MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC;
|
|
ssl->out_msglen = 1;
|
|
ssl->out_msg[0] = 1;
|
|
|
|
ssl->state++;
|
|
|
|
if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write change cipher spec" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_ssl_parse_change_cipher_spec( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse change cipher spec" ) );
|
|
|
|
if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ssl->in_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
|
|
return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
|
|
}
|
|
|
|
if( ssl->in_msglen != 1 || ssl->in_msg[0] != 1 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CHANGE_CIPHER_SPEC );
|
|
}
|
|
|
|
/*
|
|
* Switch to our negotiated transform and session parameters for inbound
|
|
* data.
|
|
*/
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for inbound data" ) );
|
|
ssl->transform_in = ssl->transform_negotiate;
|
|
ssl->session_in = ssl->session_negotiate;
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
{
|
|
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
|
|
ssl_dtls_replay_reset( ssl );
|
|
#endif
|
|
|
|
/* Increment epoch */
|
|
if( ++ssl->in_epoch == 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) );
|
|
/* This is highly unlikely to happen for legitimate reasons, so
|
|
treat it as an attack and don't send an alert. */
|
|
return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_PROTO_DTLS */
|
|
memset( ssl->in_ctr, 0, 8 );
|
|
|
|
/*
|
|
* Set the in_msg pointer to the correct location based on IV length
|
|
*/
|
|
if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
|
|
{
|
|
ssl->in_msg = ssl->in_iv + ssl->transform_negotiate->ivlen -
|
|
ssl->transform_negotiate->fixed_ivlen;
|
|
}
|
|
else
|
|
ssl->in_msg = ssl->in_iv;
|
|
|
|
#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
|
|
if( mbedtls_ssl_hw_record_activate != NULL )
|
|
{
|
|
if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_INBOUND ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
|
|
return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
|
|
}
|
|
}
|
|
#endif
|
|
|
|
ssl->state++;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse change cipher spec" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
void mbedtls_ssl_optimize_checksum( mbedtls_ssl_context *ssl,
|
|
const mbedtls_ssl_ciphersuite_t *ciphersuite_info )
|
|
{
|
|
((void) ciphersuite_info);
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_1)
|
|
if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 )
|
|
ssl->handshake->update_checksum = ssl_update_checksum_md5sha1;
|
|
else
|
|
#endif
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
|
|
ssl->handshake->update_checksum = ssl_update_checksum_sha384;
|
|
else
|
|
#endif
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
if( ciphersuite_info->mac != MBEDTLS_MD_SHA384 )
|
|
ssl->handshake->update_checksum = ssl_update_checksum_sha256;
|
|
else
|
|
#endif
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return;
|
|
}
|
|
}
|
|
|
|
void mbedtls_ssl_reset_checksum( mbedtls_ssl_context *ssl )
|
|
{
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_1)
|
|
mbedtls_md5_starts_ret( &ssl->handshake->fin_md5 );
|
|
mbedtls_sha1_starts_ret( &ssl->handshake->fin_sha1 );
|
|
#endif
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
mbedtls_sha256_starts_ret( &ssl->handshake->fin_sha256, 0 );
|
|
#endif
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
mbedtls_sha512_starts_ret( &ssl->handshake->fin_sha512, 1 );
|
|
#endif
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
}
|
|
|
|
static void ssl_update_checksum_start( mbedtls_ssl_context *ssl,
|
|
const unsigned char *buf, size_t len )
|
|
{
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_1)
|
|
mbedtls_md5_update_ret( &ssl->handshake->fin_md5 , buf, len );
|
|
mbedtls_sha1_update_ret( &ssl->handshake->fin_sha1, buf, len );
|
|
#endif
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
mbedtls_sha256_update_ret( &ssl->handshake->fin_sha256, buf, len );
|
|
#endif
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
mbedtls_sha512_update_ret( &ssl->handshake->fin_sha512, buf, len );
|
|
#endif
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_1)
|
|
static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *ssl,
|
|
const unsigned char *buf, size_t len )
|
|
{
|
|
mbedtls_md5_update_ret( &ssl->handshake->fin_md5 , buf, len );
|
|
mbedtls_sha1_update_ret( &ssl->handshake->fin_sha1, buf, len );
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
static void ssl_update_checksum_sha256( mbedtls_ssl_context *ssl,
|
|
const unsigned char *buf, size_t len )
|
|
{
|
|
mbedtls_sha256_update_ret( &ssl->handshake->fin_sha256, buf, len );
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
static void ssl_update_checksum_sha384( mbedtls_ssl_context *ssl,
|
|
const unsigned char *buf, size_t len )
|
|
{
|
|
mbedtls_sha512_update_ret( &ssl->handshake->fin_sha512, buf, len );
|
|
}
|
|
#endif
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
static void ssl_calc_finished_ssl(
|
|
mbedtls_ssl_context *ssl, unsigned char *buf, int from )
|
|
{
|
|
const char *sender;
|
|
mbedtls_md5_context md5;
|
|
mbedtls_sha1_context sha1;
|
|
|
|
unsigned char padbuf[48];
|
|
unsigned char md5sum[16];
|
|
unsigned char sha1sum[20];
|
|
|
|
mbedtls_ssl_session *session = ssl->session_negotiate;
|
|
if( !session )
|
|
session = ssl->session;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished ssl" ) );
|
|
|
|
mbedtls_md5_init( &md5 );
|
|
mbedtls_sha1_init( &sha1 );
|
|
|
|
mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
|
|
mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
|
|
|
|
/*
|
|
* SSLv3:
|
|
* hash =
|
|
* MD5( master + pad2 +
|
|
* MD5( handshake + sender + master + pad1 ) )
|
|
* + SHA1( master + pad2 +
|
|
* SHA1( handshake + sender + master + pad1 ) )
|
|
*/
|
|
|
|
#if !defined(MBEDTLS_MD5_ALT)
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *)
|
|
md5.state, sizeof( md5.state ) );
|
|
#endif
|
|
|
|
#if !defined(MBEDTLS_SHA1_ALT)
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *)
|
|
sha1.state, sizeof( sha1.state ) );
|
|
#endif
|
|
|
|
sender = ( from == MBEDTLS_SSL_IS_CLIENT ) ? "CLNT"
|
|
: "SRVR";
|
|
|
|
memset( padbuf, 0x36, 48 );
|
|
|
|
mbedtls_md5_update_ret( &md5, (const unsigned char *) sender, 4 );
|
|
mbedtls_md5_update_ret( &md5, session->master, 48 );
|
|
mbedtls_md5_update_ret( &md5, padbuf, 48 );
|
|
mbedtls_md5_finish_ret( &md5, md5sum );
|
|
|
|
mbedtls_sha1_update_ret( &sha1, (const unsigned char *) sender, 4 );
|
|
mbedtls_sha1_update_ret( &sha1, session->master, 48 );
|
|
mbedtls_sha1_update_ret( &sha1, padbuf, 40 );
|
|
mbedtls_sha1_finish_ret( &sha1, sha1sum );
|
|
|
|
memset( padbuf, 0x5C, 48 );
|
|
|
|
mbedtls_md5_starts_ret( &md5 );
|
|
mbedtls_md5_update_ret( &md5, session->master, 48 );
|
|
mbedtls_md5_update_ret( &md5, padbuf, 48 );
|
|
mbedtls_md5_update_ret( &md5, md5sum, 16 );
|
|
mbedtls_md5_finish_ret( &md5, buf );
|
|
|
|
mbedtls_sha1_starts_ret( &sha1 );
|
|
mbedtls_sha1_update_ret( &sha1, session->master, 48 );
|
|
mbedtls_sha1_update_ret( &sha1, padbuf , 40 );
|
|
mbedtls_sha1_update_ret( &sha1, sha1sum, 20 );
|
|
mbedtls_sha1_finish_ret( &sha1, buf + 16 );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, 36 );
|
|
|
|
mbedtls_md5_free( &md5 );
|
|
mbedtls_sha1_free( &sha1 );
|
|
|
|
mbedtls_zeroize( padbuf, sizeof( padbuf ) );
|
|
mbedtls_zeroize( md5sum, sizeof( md5sum ) );
|
|
mbedtls_zeroize( sha1sum, sizeof( sha1sum ) );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_SSL3 */
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
|
|
static void ssl_calc_finished_tls(
|
|
mbedtls_ssl_context *ssl, unsigned char *buf, int from )
|
|
{
|
|
int len = 12;
|
|
const char *sender;
|
|
mbedtls_md5_context md5;
|
|
mbedtls_sha1_context sha1;
|
|
unsigned char padbuf[36];
|
|
|
|
mbedtls_ssl_session *session = ssl->session_negotiate;
|
|
if( !session )
|
|
session = ssl->session;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls" ) );
|
|
|
|
mbedtls_md5_init( &md5 );
|
|
mbedtls_sha1_init( &sha1 );
|
|
|
|
mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
|
|
mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
|
|
|
|
/*
|
|
* TLSv1:
|
|
* hash = PRF( master, finished_label,
|
|
* MD5( handshake ) + SHA1( handshake ) )[0..11]
|
|
*/
|
|
|
|
#if !defined(MBEDTLS_MD5_ALT)
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *)
|
|
md5.state, sizeof( md5.state ) );
|
|
#endif
|
|
|
|
#if !defined(MBEDTLS_SHA1_ALT)
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *)
|
|
sha1.state, sizeof( sha1.state ) );
|
|
#endif
|
|
|
|
sender = ( from == MBEDTLS_SSL_IS_CLIENT )
|
|
? "client finished"
|
|
: "server finished";
|
|
|
|
mbedtls_md5_finish_ret( &md5, padbuf );
|
|
mbedtls_sha1_finish_ret( &sha1, padbuf + 16 );
|
|
|
|
ssl->handshake->tls_prf( session->master, 48, sender,
|
|
padbuf, 36, buf, len );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
|
|
|
|
mbedtls_md5_free( &md5 );
|
|
mbedtls_sha1_free( &sha1 );
|
|
|
|
mbedtls_zeroize( padbuf, sizeof( padbuf ) );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
static void ssl_calc_finished_tls_sha256(
|
|
mbedtls_ssl_context *ssl, unsigned char *buf, int from )
|
|
{
|
|
int len = 12;
|
|
const char *sender;
|
|
mbedtls_sha256_context sha256;
|
|
unsigned char padbuf[32];
|
|
|
|
mbedtls_ssl_session *session = ssl->session_negotiate;
|
|
if( !session )
|
|
session = ssl->session;
|
|
|
|
mbedtls_sha256_init( &sha256 );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha256" ) );
|
|
|
|
mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 );
|
|
|
|
/*
|
|
* TLSv1.2:
|
|
* hash = PRF( master, finished_label,
|
|
* Hash( handshake ) )[0.11]
|
|
*/
|
|
|
|
#if !defined(MBEDTLS_SHA256_ALT)
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha2 state", (unsigned char *)
|
|
sha256.state, sizeof( sha256.state ) );
|
|
#endif
|
|
|
|
sender = ( from == MBEDTLS_SSL_IS_CLIENT )
|
|
? "client finished"
|
|
: "server finished";
|
|
|
|
mbedtls_sha256_finish_ret( &sha256, padbuf );
|
|
|
|
ssl->handshake->tls_prf( session->master, 48, sender,
|
|
padbuf, 32, buf, len );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
|
|
|
|
mbedtls_sha256_free( &sha256 );
|
|
|
|
mbedtls_zeroize( padbuf, sizeof( padbuf ) );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
|
|
}
|
|
#endif /* MBEDTLS_SHA256_C */
|
|
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
static void ssl_calc_finished_tls_sha384(
|
|
mbedtls_ssl_context *ssl, unsigned char *buf, int from )
|
|
{
|
|
int len = 12;
|
|
const char *sender;
|
|
mbedtls_sha512_context sha512;
|
|
unsigned char padbuf[48];
|
|
|
|
mbedtls_ssl_session *session = ssl->session_negotiate;
|
|
if( !session )
|
|
session = ssl->session;
|
|
|
|
mbedtls_sha512_init( &sha512 );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha384" ) );
|
|
|
|
mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 );
|
|
|
|
/*
|
|
* TLSv1.2:
|
|
* hash = PRF( master, finished_label,
|
|
* Hash( handshake ) )[0.11]
|
|
*/
|
|
|
|
#if !defined(MBEDTLS_SHA512_ALT)
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha512 state", (unsigned char *)
|
|
sha512.state, sizeof( sha512.state ) );
|
|
#endif
|
|
|
|
sender = ( from == MBEDTLS_SSL_IS_CLIENT )
|
|
? "client finished"
|
|
: "server finished";
|
|
|
|
mbedtls_sha512_finish_ret( &sha512, padbuf );
|
|
|
|
ssl->handshake->tls_prf( session->master, 48, sender,
|
|
padbuf, 48, buf, len );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
|
|
|
|
mbedtls_sha512_free( &sha512 );
|
|
|
|
mbedtls_zeroize( padbuf, sizeof( padbuf ) );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
|
|
}
|
|
#endif /* MBEDTLS_SHA512_C */
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
|
|
static void ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup: final free" ) );
|
|
|
|
/*
|
|
* Free our handshake params
|
|
*/
|
|
mbedtls_ssl_handshake_free( ssl->handshake );
|
|
mbedtls_free( ssl->handshake );
|
|
ssl->handshake = NULL;
|
|
|
|
/*
|
|
* Free the previous transform and swith in the current one
|
|
*/
|
|
if( ssl->transform )
|
|
{
|
|
mbedtls_ssl_transform_free( ssl->transform );
|
|
mbedtls_free( ssl->transform );
|
|
}
|
|
ssl->transform = ssl->transform_negotiate;
|
|
ssl->transform_negotiate = NULL;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup: final free" ) );
|
|
}
|
|
|
|
void mbedtls_ssl_handshake_wrapup( mbedtls_ssl_context *ssl )
|
|
{
|
|
int resume = ssl->handshake->resume;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup" ) );
|
|
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
|
|
{
|
|
ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_DONE;
|
|
ssl->renego_records_seen = 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Free the previous session and switch in the current one
|
|
*/
|
|
if( ssl->session )
|
|
{
|
|
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
|
|
/* RFC 7366 3.1: keep the EtM state */
|
|
ssl->session_negotiate->encrypt_then_mac =
|
|
ssl->session->encrypt_then_mac;
|
|
#endif
|
|
|
|
mbedtls_ssl_session_free( ssl->session );
|
|
mbedtls_free( ssl->session );
|
|
}
|
|
ssl->session = ssl->session_negotiate;
|
|
ssl->session_negotiate = NULL;
|
|
|
|
/*
|
|
* Add cache entry
|
|
*/
|
|
if( ssl->conf->f_set_cache != NULL &&
|
|
ssl->session->id_len != 0 &&
|
|
resume == 0 )
|
|
{
|
|
if( ssl->conf->f_set_cache( ssl->conf->p_cache, ssl->session ) != 0 )
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "cache did not store session" ) );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
|
|
ssl->handshake->flight != NULL )
|
|
{
|
|
/* Cancel handshake timer */
|
|
ssl_set_timer( ssl, 0 );
|
|
|
|
/* Keep last flight around in case we need to resend it:
|
|
* we need the handshake and transform structures for that */
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip freeing handshake and transform" ) );
|
|
}
|
|
else
|
|
#endif
|
|
ssl_handshake_wrapup_free_hs_transform( ssl );
|
|
|
|
ssl->state++;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup" ) );
|
|
}
|
|
|
|
int mbedtls_ssl_write_finished( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret, hash_len;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write finished" ) );
|
|
|
|
/*
|
|
* Set the out_msg pointer to the correct location based on IV length
|
|
*/
|
|
if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
|
|
{
|
|
ssl->out_msg = ssl->out_iv + ssl->transform_negotiate->ivlen -
|
|
ssl->transform_negotiate->fixed_ivlen;
|
|
}
|
|
else
|
|
ssl->out_msg = ssl->out_iv;
|
|
|
|
ssl->handshake->calc_finished( ssl, ssl->out_msg + 4, ssl->conf->endpoint );
|
|
|
|
/*
|
|
* RFC 5246 7.4.9 (Page 63) says 12 is the default length and ciphersuites
|
|
* may define some other value. Currently (early 2016), no defined
|
|
* ciphersuite does this (and this is unlikely to change as activity has
|
|
* moved to TLS 1.3 now) so we can keep the hardcoded 12 here.
|
|
*/
|
|
hash_len = ( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) ? 36 : 12;
|
|
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
ssl->verify_data_len = hash_len;
|
|
memcpy( ssl->own_verify_data, ssl->out_msg + 4, hash_len );
|
|
#endif
|
|
|
|
ssl->out_msglen = 4 + hash_len;
|
|
ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
|
|
ssl->out_msg[0] = MBEDTLS_SSL_HS_FINISHED;
|
|
|
|
/*
|
|
* In case of session resuming, invert the client and server
|
|
* ChangeCipherSpec messages order.
|
|
*/
|
|
if( ssl->handshake->resume != 0 )
|
|
{
|
|
#if defined(MBEDTLS_SSL_CLI_C)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
|
|
ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
|
|
#endif
|
|
#if defined(MBEDTLS_SSL_SRV_C)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
|
|
ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC;
|
|
#endif
|
|
}
|
|
else
|
|
ssl->state++;
|
|
|
|
/*
|
|
* Switch to our negotiated transform and session parameters for outbound
|
|
* data.
|
|
*/
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for outbound data" ) );
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
{
|
|
unsigned char i;
|
|
|
|
/* Remember current epoch settings for resending */
|
|
ssl->handshake->alt_transform_out = ssl->transform_out;
|
|
memcpy( ssl->handshake->alt_out_ctr, ssl->out_ctr, 8 );
|
|
|
|
/* Set sequence_number to zero */
|
|
memset( ssl->out_ctr + 2, 0, 6 );
|
|
|
|
/* Increment epoch */
|
|
for( i = 2; i > 0; i-- )
|
|
if( ++ssl->out_ctr[i - 1] != 0 )
|
|
break;
|
|
|
|
/* The loop goes to its end iff the counter is wrapping */
|
|
if( i == 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) );
|
|
return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_PROTO_DTLS */
|
|
memset( ssl->out_ctr, 0, 8 );
|
|
|
|
ssl->transform_out = ssl->transform_negotiate;
|
|
ssl->session_out = ssl->session_negotiate;
|
|
|
|
#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
|
|
if( mbedtls_ssl_hw_record_activate != NULL )
|
|
{
|
|
if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
|
|
return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
mbedtls_ssl_send_flight_completed( ssl );
|
|
#endif
|
|
|
|
if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write finished" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
#define SSL_MAX_HASH_LEN 36
|
|
#else
|
|
#define SSL_MAX_HASH_LEN 12
|
|
#endif
|
|
|
|
int mbedtls_ssl_parse_finished( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
unsigned int hash_len;
|
|
unsigned char buf[SSL_MAX_HASH_LEN];
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse finished" ) );
|
|
|
|
ssl->handshake->calc_finished( ssl, buf, ssl->conf->endpoint ^ 1 );
|
|
|
|
if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
|
|
return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
|
|
}
|
|
|
|
/* There is currently no ciphersuite using another length with TLS 1.2 */
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
|
|
hash_len = 36;
|
|
else
|
|
#endif
|
|
hash_len = 12;
|
|
|
|
if( ssl->in_msg[0] != MBEDTLS_SSL_HS_FINISHED ||
|
|
ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + hash_len )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED );
|
|
}
|
|
|
|
if( mbedtls_ssl_safer_memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ),
|
|
buf, hash_len ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
ssl->verify_data_len = hash_len;
|
|
memcpy( ssl->peer_verify_data, buf, hash_len );
|
|
#endif
|
|
|
|
if( ssl->handshake->resume != 0 )
|
|
{
|
|
#if defined(MBEDTLS_SSL_CLI_C)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
|
|
ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC;
|
|
#endif
|
|
#if defined(MBEDTLS_SSL_SRV_C)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
|
|
ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
|
|
#endif
|
|
}
|
|
else
|
|
ssl->state++;
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
mbedtls_ssl_recv_flight_completed( ssl );
|
|
#endif
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse finished" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static void ssl_handshake_params_init( mbedtls_ssl_handshake_params *handshake )
|
|
{
|
|
memset( handshake, 0, sizeof( mbedtls_ssl_handshake_params ) );
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_1)
|
|
mbedtls_md5_init( &handshake->fin_md5 );
|
|
mbedtls_sha1_init( &handshake->fin_sha1 );
|
|
mbedtls_md5_starts_ret( &handshake->fin_md5 );
|
|
mbedtls_sha1_starts_ret( &handshake->fin_sha1 );
|
|
#endif
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
mbedtls_sha256_init( &handshake->fin_sha256 );
|
|
mbedtls_sha256_starts_ret( &handshake->fin_sha256, 0 );
|
|
#endif
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
mbedtls_sha512_init( &handshake->fin_sha512 );
|
|
mbedtls_sha512_starts_ret( &handshake->fin_sha512, 1 );
|
|
#endif
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
|
|
handshake->update_checksum = ssl_update_checksum_start;
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
|
|
defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
|
|
mbedtls_ssl_sig_hash_set_init( &handshake->hash_algs );
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_DHM_C)
|
|
mbedtls_dhm_init( &handshake->dhm_ctx );
|
|
#endif
|
|
#if defined(MBEDTLS_ECDH_C)
|
|
mbedtls_ecdh_init( &handshake->ecdh_ctx );
|
|
#endif
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
|
|
mbedtls_ecjpake_init( &handshake->ecjpake_ctx );
|
|
#if defined(MBEDTLS_SSL_CLI_C)
|
|
handshake->ecjpake_cache = NULL;
|
|
handshake->ecjpake_cache_len = 0;
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
|
|
handshake->sni_authmode = MBEDTLS_SSL_VERIFY_UNSET;
|
|
#endif
|
|
}
|
|
|
|
static void ssl_transform_init( mbedtls_ssl_transform *transform )
|
|
{
|
|
memset( transform, 0, sizeof(mbedtls_ssl_transform) );
|
|
|
|
mbedtls_cipher_init( &transform->cipher_ctx_enc );
|
|
mbedtls_cipher_init( &transform->cipher_ctx_dec );
|
|
|
|
mbedtls_md_init( &transform->md_ctx_enc );
|
|
mbedtls_md_init( &transform->md_ctx_dec );
|
|
}
|
|
|
|
void mbedtls_ssl_session_init( mbedtls_ssl_session *session )
|
|
{
|
|
memset( session, 0, sizeof(mbedtls_ssl_session) );
|
|
}
|
|
|
|
static int ssl_handshake_init( mbedtls_ssl_context *ssl )
|
|
{
|
|
/* Clear old handshake information if present */
|
|
if( ssl->transform_negotiate )
|
|
mbedtls_ssl_transform_free( ssl->transform_negotiate );
|
|
if( ssl->session_negotiate )
|
|
mbedtls_ssl_session_free( ssl->session_negotiate );
|
|
if( ssl->handshake )
|
|
mbedtls_ssl_handshake_free( ssl->handshake );
|
|
|
|
/*
|
|
* Either the pointers are now NULL or cleared properly and can be freed.
|
|
* Now allocate missing structures.
|
|
*/
|
|
if( ssl->transform_negotiate == NULL )
|
|
{
|
|
ssl->transform_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_transform) );
|
|
}
|
|
|
|
if( ssl->session_negotiate == NULL )
|
|
{
|
|
ssl->session_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_session) );
|
|
}
|
|
|
|
if( ssl->handshake == NULL )
|
|
{
|
|
ssl->handshake = mbedtls_calloc( 1, sizeof(mbedtls_ssl_handshake_params) );
|
|
}
|
|
|
|
/* All pointers should exist and can be directly freed without issue */
|
|
if( ssl->handshake == NULL ||
|
|
ssl->transform_negotiate == NULL ||
|
|
ssl->session_negotiate == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc() of ssl sub-contexts failed" ) );
|
|
|
|
mbedtls_free( ssl->handshake );
|
|
mbedtls_free( ssl->transform_negotiate );
|
|
mbedtls_free( ssl->session_negotiate );
|
|
|
|
ssl->handshake = NULL;
|
|
ssl->transform_negotiate = NULL;
|
|
ssl->session_negotiate = NULL;
|
|
|
|
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
|
|
}
|
|
|
|
/* Initialize structures */
|
|
mbedtls_ssl_session_init( ssl->session_negotiate );
|
|
ssl_transform_init( ssl->transform_negotiate );
|
|
ssl_handshake_params_init( ssl->handshake );
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
{
|
|
ssl->handshake->alt_transform_out = ssl->transform_out;
|
|
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
|
|
ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING;
|
|
else
|
|
ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
|
|
|
|
ssl_set_timer( ssl, 0 );
|
|
}
|
|
#endif
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
|
|
/* Dummy cookie callbacks for defaults */
|
|
static int ssl_cookie_write_dummy( void *ctx,
|
|
unsigned char **p, unsigned char *end,
|
|
const unsigned char *cli_id, size_t cli_id_len )
|
|
{
|
|
((void) ctx);
|
|
((void) p);
|
|
((void) end);
|
|
((void) cli_id);
|
|
((void) cli_id_len);
|
|
|
|
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
|
|
}
|
|
|
|
static int ssl_cookie_check_dummy( void *ctx,
|
|
const unsigned char *cookie, size_t cookie_len,
|
|
const unsigned char *cli_id, size_t cli_id_len )
|
|
{
|
|
((void) ctx);
|
|
((void) cookie);
|
|
((void) cookie_len);
|
|
((void) cli_id);
|
|
((void) cli_id_len);
|
|
|
|
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
|
|
}
|
|
#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */
|
|
|
|
/*
|
|
* Initialize an SSL context
|
|
*/
|
|
void mbedtls_ssl_init( mbedtls_ssl_context *ssl )
|
|
{
|
|
memset( ssl, 0, sizeof( mbedtls_ssl_context ) );
|
|
}
|
|
|
|
/*
|
|
* Setup an SSL context
|
|
*/
|
|
int mbedtls_ssl_setup( mbedtls_ssl_context *ssl,
|
|
const mbedtls_ssl_config *conf )
|
|
{
|
|
int ret;
|
|
const size_t len = MBEDTLS_SSL_BUFFER_LEN;
|
|
|
|
ssl->conf = conf;
|
|
|
|
/*
|
|
* Prepare base structures
|
|
*/
|
|
ssl->in_buf = NULL;
|
|
ssl->out_buf = NULL;
|
|
if( ( ssl-> in_buf = mbedtls_calloc( 1, len ) ) == NULL ||
|
|
( ssl->out_buf = mbedtls_calloc( 1, len ) ) == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", len ) );
|
|
ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
|
|
goto error;
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
{
|
|
ssl->out_hdr = ssl->out_buf;
|
|
ssl->out_ctr = ssl->out_buf + 3;
|
|
ssl->out_len = ssl->out_buf + 11;
|
|
ssl->out_iv = ssl->out_buf + 13;
|
|
ssl->out_msg = ssl->out_buf + 13;
|
|
|
|
ssl->in_hdr = ssl->in_buf;
|
|
ssl->in_ctr = ssl->in_buf + 3;
|
|
ssl->in_len = ssl->in_buf + 11;
|
|
ssl->in_iv = ssl->in_buf + 13;
|
|
ssl->in_msg = ssl->in_buf + 13;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
ssl->out_ctr = ssl->out_buf;
|
|
ssl->out_hdr = ssl->out_buf + 8;
|
|
ssl->out_len = ssl->out_buf + 11;
|
|
ssl->out_iv = ssl->out_buf + 13;
|
|
ssl->out_msg = ssl->out_buf + 13;
|
|
|
|
ssl->in_ctr = ssl->in_buf;
|
|
ssl->in_hdr = ssl->in_buf + 8;
|
|
ssl->in_len = ssl->in_buf + 11;
|
|
ssl->in_iv = ssl->in_buf + 13;
|
|
ssl->in_msg = ssl->in_buf + 13;
|
|
}
|
|
|
|
if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
|
|
goto error;
|
|
|
|
return( 0 );
|
|
|
|
error:
|
|
mbedtls_free( ssl->in_buf );
|
|
mbedtls_free( ssl->out_buf );
|
|
|
|
ssl->conf = NULL;
|
|
|
|
ssl->in_buf = NULL;
|
|
ssl->out_buf = NULL;
|
|
|
|
ssl->in_hdr = NULL;
|
|
ssl->in_ctr = NULL;
|
|
ssl->in_len = NULL;
|
|
ssl->in_iv = NULL;
|
|
ssl->in_msg = NULL;
|
|
|
|
ssl->out_hdr = NULL;
|
|
ssl->out_ctr = NULL;
|
|
ssl->out_len = NULL;
|
|
ssl->out_iv = NULL;
|
|
ssl->out_msg = NULL;
|
|
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* Reset an initialized and used SSL context for re-use while retaining
|
|
* all application-set variables, function pointers and data.
|
|
*
|
|
* If partial is non-zero, keep data in the input buffer and client ID.
|
|
* (Use when a DTLS client reconnects from the same port.)
|
|
*/
|
|
static int ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial )
|
|
{
|
|
int ret;
|
|
|
|
ssl->state = MBEDTLS_SSL_HELLO_REQUEST;
|
|
|
|
/* Cancel any possibly running timer */
|
|
ssl_set_timer( ssl, 0 );
|
|
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
ssl->renego_status = MBEDTLS_SSL_INITIAL_HANDSHAKE;
|
|
ssl->renego_records_seen = 0;
|
|
|
|
ssl->verify_data_len = 0;
|
|
memset( ssl->own_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN );
|
|
memset( ssl->peer_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN );
|
|
#endif
|
|
ssl->secure_renegotiation = MBEDTLS_SSL_LEGACY_RENEGOTIATION;
|
|
|
|
ssl->in_offt = NULL;
|
|
|
|
ssl->in_msg = ssl->in_buf + 13;
|
|
ssl->in_msgtype = 0;
|
|
ssl->in_msglen = 0;
|
|
if( partial == 0 )
|
|
ssl->in_left = 0;
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
ssl->next_record_offset = 0;
|
|
ssl->in_epoch = 0;
|
|
#endif
|
|
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
|
|
ssl_dtls_replay_reset( ssl );
|
|
#endif
|
|
|
|
ssl->in_hslen = 0;
|
|
ssl->nb_zero = 0;
|
|
|
|
ssl->keep_current_message = 0;
|
|
|
|
ssl->out_msg = ssl->out_buf + 13;
|
|
ssl->out_msgtype = 0;
|
|
ssl->out_msglen = 0;
|
|
ssl->out_left = 0;
|
|
#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
|
|
if( ssl->split_done != MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED )
|
|
ssl->split_done = 0;
|
|
#endif
|
|
|
|
ssl->transform_in = NULL;
|
|
ssl->transform_out = NULL;
|
|
|
|
ssl->session_in = NULL;
|
|
ssl->session_out = NULL;
|
|
|
|
memset( ssl->out_buf, 0, MBEDTLS_SSL_BUFFER_LEN );
|
|
|
|
if( partial == 0 )
|
|
memset( ssl->in_buf, 0, MBEDTLS_SSL_BUFFER_LEN );
|
|
|
|
#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
|
|
if( mbedtls_ssl_hw_record_reset != NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_reset()" ) );
|
|
if( ( ret = mbedtls_ssl_hw_record_reset( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_reset", ret );
|
|
return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if( ssl->transform )
|
|
{
|
|
mbedtls_ssl_transform_free( ssl->transform );
|
|
mbedtls_free( ssl->transform );
|
|
ssl->transform = NULL;
|
|
}
|
|
|
|
if( ssl->session )
|
|
{
|
|
mbedtls_ssl_session_free( ssl->session );
|
|
mbedtls_free( ssl->session );
|
|
ssl->session = NULL;
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_ALPN)
|
|
ssl->alpn_chosen = NULL;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
|
|
if( partial == 0 )
|
|
{
|
|
mbedtls_free( ssl->cli_id );
|
|
ssl->cli_id = NULL;
|
|
ssl->cli_id_len = 0;
|
|
}
|
|
#endif
|
|
|
|
if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
|
|
return( ret );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Reset an initialized and used SSL context for re-use while retaining
|
|
* all application-set variables, function pointers and data.
|
|
*/
|
|
int mbedtls_ssl_session_reset( mbedtls_ssl_context *ssl )
|
|
{
|
|
return( ssl_session_reset_int( ssl, 0 ) );
|
|
}
|
|
|
|
/*
|
|
* SSL set accessors
|
|
*/
|
|
void mbedtls_ssl_conf_endpoint( mbedtls_ssl_config *conf, int endpoint )
|
|
{
|
|
conf->endpoint = endpoint;
|
|
}
|
|
|
|
void mbedtls_ssl_conf_transport( mbedtls_ssl_config *conf, int transport )
|
|
{
|
|
conf->transport = transport;
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
|
|
void mbedtls_ssl_conf_dtls_anti_replay( mbedtls_ssl_config *conf, char mode )
|
|
{
|
|
conf->anti_replay = mode;
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
|
|
void mbedtls_ssl_conf_dtls_badmac_limit( mbedtls_ssl_config *conf, unsigned limit )
|
|
{
|
|
conf->badmac_limit = limit;
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
void mbedtls_ssl_conf_handshake_timeout( mbedtls_ssl_config *conf, uint32_t min, uint32_t max )
|
|
{
|
|
conf->hs_timeout_min = min;
|
|
conf->hs_timeout_max = max;
|
|
}
|
|
#endif
|
|
|
|
void mbedtls_ssl_conf_authmode( mbedtls_ssl_config *conf, int authmode )
|
|
{
|
|
conf->authmode = authmode;
|
|
}
|
|
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
|
void mbedtls_ssl_conf_verify( mbedtls_ssl_config *conf,
|
|
int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
|
|
void *p_vrfy )
|
|
{
|
|
conf->f_vrfy = f_vrfy;
|
|
conf->p_vrfy = p_vrfy;
|
|
}
|
|
#endif /* MBEDTLS_X509_CRT_PARSE_C */
|
|
|
|
void mbedtls_ssl_conf_rng( mbedtls_ssl_config *conf,
|
|
int (*f_rng)(void *, unsigned char *, size_t),
|
|
void *p_rng )
|
|
{
|
|
conf->f_rng = f_rng;
|
|
conf->p_rng = p_rng;
|
|
}
|
|
|
|
void mbedtls_ssl_conf_dbg( mbedtls_ssl_config *conf,
|
|
void (*f_dbg)(void *, int, const char *, int, const char *),
|
|
void *p_dbg )
|
|
{
|
|
conf->f_dbg = f_dbg;
|
|
conf->p_dbg = p_dbg;
|
|
}
|
|
|
|
void mbedtls_ssl_set_bio( mbedtls_ssl_context *ssl,
|
|
void *p_bio,
|
|
mbedtls_ssl_send_t *f_send,
|
|
mbedtls_ssl_recv_t *f_recv,
|
|
mbedtls_ssl_recv_timeout_t *f_recv_timeout )
|
|
{
|
|
ssl->p_bio = p_bio;
|
|
ssl->f_send = f_send;
|
|
ssl->f_recv = f_recv;
|
|
ssl->f_recv_timeout = f_recv_timeout;
|
|
}
|
|
|
|
void mbedtls_ssl_conf_read_timeout( mbedtls_ssl_config *conf, uint32_t timeout )
|
|
{
|
|
conf->read_timeout = timeout;
|
|
}
|
|
|
|
void mbedtls_ssl_set_timer_cb( mbedtls_ssl_context *ssl,
|
|
void *p_timer,
|
|
mbedtls_ssl_set_timer_t *f_set_timer,
|
|
mbedtls_ssl_get_timer_t *f_get_timer )
|
|
{
|
|
ssl->p_timer = p_timer;
|
|
ssl->f_set_timer = f_set_timer;
|
|
ssl->f_get_timer = f_get_timer;
|
|
|
|
/* Make sure we start with no timer running */
|
|
ssl_set_timer( ssl, 0 );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_SRV_C)
|
|
void mbedtls_ssl_conf_session_cache( mbedtls_ssl_config *conf,
|
|
void *p_cache,
|
|
int (*f_get_cache)(void *, mbedtls_ssl_session *),
|
|
int (*f_set_cache)(void *, const mbedtls_ssl_session *) )
|
|
{
|
|
conf->p_cache = p_cache;
|
|
conf->f_get_cache = f_get_cache;
|
|
conf->f_set_cache = f_set_cache;
|
|
}
|
|
#endif /* MBEDTLS_SSL_SRV_C */
|
|
|
|
#if defined(MBEDTLS_SSL_CLI_C)
|
|
int mbedtls_ssl_set_session( mbedtls_ssl_context *ssl, const mbedtls_ssl_session *session )
|
|
{
|
|
int ret;
|
|
|
|
if( ssl == NULL ||
|
|
session == NULL ||
|
|
ssl->session_negotiate == NULL ||
|
|
ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT )
|
|
{
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
if( ( ret = ssl_session_copy( ssl->session_negotiate, session ) ) != 0 )
|
|
return( ret );
|
|
|
|
ssl->handshake->resume = 1;
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_SSL_CLI_C */
|
|
|
|
void mbedtls_ssl_conf_ciphersuites( mbedtls_ssl_config *conf,
|
|
const int *ciphersuites )
|
|
{
|
|
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = ciphersuites;
|
|
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = ciphersuites;
|
|
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = ciphersuites;
|
|
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = ciphersuites;
|
|
}
|
|
|
|
void mbedtls_ssl_conf_ciphersuites_for_version( mbedtls_ssl_config *conf,
|
|
const int *ciphersuites,
|
|
int major, int minor )
|
|
{
|
|
if( major != MBEDTLS_SSL_MAJOR_VERSION_3 )
|
|
return;
|
|
|
|
if( minor < MBEDTLS_SSL_MINOR_VERSION_0 || minor > MBEDTLS_SSL_MINOR_VERSION_3 )
|
|
return;
|
|
|
|
conf->ciphersuite_list[minor] = ciphersuites;
|
|
}
|
|
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
|
void mbedtls_ssl_conf_cert_profile( mbedtls_ssl_config *conf,
|
|
const mbedtls_x509_crt_profile *profile )
|
|
{
|
|
conf->cert_profile = profile;
|
|
}
|
|
|
|
/* Append a new keycert entry to a (possibly empty) list */
|
|
static int ssl_append_key_cert( mbedtls_ssl_key_cert **head,
|
|
mbedtls_x509_crt *cert,
|
|
mbedtls_pk_context *key )
|
|
{
|
|
mbedtls_ssl_key_cert *new_cert;
|
|
|
|
new_cert = mbedtls_calloc( 1, sizeof( mbedtls_ssl_key_cert ) );
|
|
if( new_cert == NULL )
|
|
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
|
|
|
|
new_cert->cert = cert;
|
|
new_cert->key = key;
|
|
new_cert->next = NULL;
|
|
|
|
/* Update head is the list was null, else add to the end */
|
|
if( *head == NULL )
|
|
{
|
|
*head = new_cert;
|
|
}
|
|
else
|
|
{
|
|
mbedtls_ssl_key_cert *cur = *head;
|
|
while( cur->next != NULL )
|
|
cur = cur->next;
|
|
cur->next = new_cert;
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_ssl_conf_own_cert( mbedtls_ssl_config *conf,
|
|
mbedtls_x509_crt *own_cert,
|
|
mbedtls_pk_context *pk_key )
|
|
{
|
|
return( ssl_append_key_cert( &conf->key_cert, own_cert, pk_key ) );
|
|
}
|
|
|
|
void mbedtls_ssl_conf_ca_chain( mbedtls_ssl_config *conf,
|
|
mbedtls_x509_crt *ca_chain,
|
|
mbedtls_x509_crl *ca_crl )
|
|
{
|
|
conf->ca_chain = ca_chain;
|
|
conf->ca_crl = ca_crl;
|
|
}
|
|
#endif /* MBEDTLS_X509_CRT_PARSE_C */
|
|
|
|
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
|
|
int mbedtls_ssl_set_hs_own_cert( mbedtls_ssl_context *ssl,
|
|
mbedtls_x509_crt *own_cert,
|
|
mbedtls_pk_context *pk_key )
|
|
{
|
|
return( ssl_append_key_cert( &ssl->handshake->sni_key_cert,
|
|
own_cert, pk_key ) );
|
|
}
|
|
|
|
void mbedtls_ssl_set_hs_ca_chain( mbedtls_ssl_context *ssl,
|
|
mbedtls_x509_crt *ca_chain,
|
|
mbedtls_x509_crl *ca_crl )
|
|
{
|
|
ssl->handshake->sni_ca_chain = ca_chain;
|
|
ssl->handshake->sni_ca_crl = ca_crl;
|
|
}
|
|
|
|
void mbedtls_ssl_set_hs_authmode( mbedtls_ssl_context *ssl,
|
|
int authmode )
|
|
{
|
|
ssl->handshake->sni_authmode = authmode;
|
|
}
|
|
#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
|
|
/*
|
|
* Set EC J-PAKE password for current handshake
|
|
*/
|
|
int mbedtls_ssl_set_hs_ecjpake_password( mbedtls_ssl_context *ssl,
|
|
const unsigned char *pw,
|
|
size_t pw_len )
|
|
{
|
|
mbedtls_ecjpake_role role;
|
|
|
|
if( ssl->handshake == NULL || ssl->conf == NULL )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
|
|
role = MBEDTLS_ECJPAKE_SERVER;
|
|
else
|
|
role = MBEDTLS_ECJPAKE_CLIENT;
|
|
|
|
return( mbedtls_ecjpake_setup( &ssl->handshake->ecjpake_ctx,
|
|
role,
|
|
MBEDTLS_MD_SHA256,
|
|
MBEDTLS_ECP_DP_SECP256R1,
|
|
pw, pw_len ) );
|
|
}
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
|
|
int mbedtls_ssl_conf_psk( mbedtls_ssl_config *conf,
|
|
const unsigned char *psk, size_t psk_len,
|
|
const unsigned char *psk_identity, size_t psk_identity_len )
|
|
{
|
|
if( psk == NULL || psk_identity == NULL )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
if( psk_len > MBEDTLS_PSK_MAX_LEN )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
/* Identity len will be encoded on two bytes */
|
|
if( ( psk_identity_len >> 16 ) != 0 ||
|
|
psk_identity_len > MBEDTLS_SSL_MAX_CONTENT_LEN )
|
|
{
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
if( conf->psk != NULL )
|
|
{
|
|
mbedtls_zeroize( conf->psk, conf->psk_len );
|
|
|
|
mbedtls_free( conf->psk );
|
|
conf->psk = NULL;
|
|
conf->psk_len = 0;
|
|
}
|
|
if( conf->psk_identity != NULL )
|
|
{
|
|
mbedtls_free( conf->psk_identity );
|
|
conf->psk_identity = NULL;
|
|
conf->psk_identity_len = 0;
|
|
}
|
|
|
|
if( ( conf->psk = mbedtls_calloc( 1, psk_len ) ) == NULL ||
|
|
( conf->psk_identity = mbedtls_calloc( 1, psk_identity_len ) ) == NULL )
|
|
{
|
|
mbedtls_free( conf->psk );
|
|
mbedtls_free( conf->psk_identity );
|
|
conf->psk = NULL;
|
|
conf->psk_identity = NULL;
|
|
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
|
|
}
|
|
|
|
conf->psk_len = psk_len;
|
|
conf->psk_identity_len = psk_identity_len;
|
|
|
|
memcpy( conf->psk, psk, conf->psk_len );
|
|
memcpy( conf->psk_identity, psk_identity, conf->psk_identity_len );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl,
|
|
const unsigned char *psk, size_t psk_len )
|
|
{
|
|
if( psk == NULL || ssl->handshake == NULL )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
if( psk_len > MBEDTLS_PSK_MAX_LEN )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
if( ssl->handshake->psk != NULL )
|
|
{
|
|
mbedtls_zeroize( ssl->handshake->psk, ssl->handshake->psk_len );
|
|
mbedtls_free( ssl->handshake->psk );
|
|
ssl->handshake->psk_len = 0;
|
|
}
|
|
|
|
if( ( ssl->handshake->psk = mbedtls_calloc( 1, psk_len ) ) == NULL )
|
|
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
|
|
|
|
ssl->handshake->psk_len = psk_len;
|
|
memcpy( ssl->handshake->psk, psk, ssl->handshake->psk_len );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
void mbedtls_ssl_conf_psk_cb( mbedtls_ssl_config *conf,
|
|
int (*f_psk)(void *, mbedtls_ssl_context *, const unsigned char *,
|
|
size_t),
|
|
void *p_psk )
|
|
{
|
|
conf->f_psk = f_psk;
|
|
conf->p_psk = p_psk;
|
|
}
|
|
#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
|
|
|
|
#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
|
|
|
|
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
|
|
int mbedtls_ssl_conf_dh_param( mbedtls_ssl_config *conf, const char *dhm_P, const char *dhm_G )
|
|
{
|
|
int ret;
|
|
|
|
if( ( ret = mbedtls_mpi_read_string( &conf->dhm_P, 16, dhm_P ) ) != 0 ||
|
|
( ret = mbedtls_mpi_read_string( &conf->dhm_G, 16, dhm_G ) ) != 0 )
|
|
{
|
|
mbedtls_mpi_free( &conf->dhm_P );
|
|
mbedtls_mpi_free( &conf->dhm_G );
|
|
return( ret );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_DEPRECATED_REMOVED */
|
|
|
|
int mbedtls_ssl_conf_dh_param_bin( mbedtls_ssl_config *conf,
|
|
const unsigned char *dhm_P, size_t P_len,
|
|
const unsigned char *dhm_G, size_t G_len )
|
|
{
|
|
int ret;
|
|
|
|
if( ( ret = mbedtls_mpi_read_binary( &conf->dhm_P, dhm_P, P_len ) ) != 0 ||
|
|
( ret = mbedtls_mpi_read_binary( &conf->dhm_G, dhm_G, G_len ) ) != 0 )
|
|
{
|
|
mbedtls_mpi_free( &conf->dhm_P );
|
|
mbedtls_mpi_free( &conf->dhm_G );
|
|
return( ret );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_ssl_conf_dh_param_ctx( mbedtls_ssl_config *conf, mbedtls_dhm_context *dhm_ctx )
|
|
{
|
|
int ret;
|
|
|
|
if( ( ret = mbedtls_mpi_copy( &conf->dhm_P, &dhm_ctx->P ) ) != 0 ||
|
|
( ret = mbedtls_mpi_copy( &conf->dhm_G, &dhm_ctx->G ) ) != 0 )
|
|
{
|
|
mbedtls_mpi_free( &conf->dhm_P );
|
|
mbedtls_mpi_free( &conf->dhm_G );
|
|
return( ret );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_SRV_C */
|
|
|
|
#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
|
|
/*
|
|
* Set the minimum length for Diffie-Hellman parameters
|
|
*/
|
|
void mbedtls_ssl_conf_dhm_min_bitlen( mbedtls_ssl_config *conf,
|
|
unsigned int bitlen )
|
|
{
|
|
conf->dhm_min_bitlen = bitlen;
|
|
}
|
|
#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
|
|
/*
|
|
* Set allowed/preferred hashes for handshake signatures
|
|
*/
|
|
void mbedtls_ssl_conf_sig_hashes( mbedtls_ssl_config *conf,
|
|
const int *hashes )
|
|
{
|
|
conf->sig_hashes = hashes;
|
|
}
|
|
#endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
|
|
|
|
#if defined(MBEDTLS_ECP_C)
|
|
/*
|
|
* Set the allowed elliptic curves
|
|
*/
|
|
void mbedtls_ssl_conf_curves( mbedtls_ssl_config *conf,
|
|
const mbedtls_ecp_group_id *curve_list )
|
|
{
|
|
conf->curve_list = curve_list;
|
|
}
|
|
#endif /* MBEDTLS_ECP_C */
|
|
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
|
int mbedtls_ssl_set_hostname( mbedtls_ssl_context *ssl, const char *hostname )
|
|
{
|
|
/* Initialize to suppress unnecessary compiler warning */
|
|
size_t hostname_len = 0;
|
|
|
|
/* Check if new hostname is valid before
|
|
* making any change to current one */
|
|
if( hostname != NULL )
|
|
{
|
|
hostname_len = strlen( hostname );
|
|
|
|
if( hostname_len > MBEDTLS_SSL_MAX_HOST_NAME_LEN )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
/* Now it's clear that we will overwrite the old hostname,
|
|
* so we can free it safely */
|
|
|
|
if( ssl->hostname != NULL )
|
|
{
|
|
mbedtls_zeroize( ssl->hostname, strlen( ssl->hostname ) );
|
|
mbedtls_free( ssl->hostname );
|
|
}
|
|
|
|
/* Passing NULL as hostname shall clear the old one */
|
|
|
|
if( hostname == NULL )
|
|
{
|
|
ssl->hostname = NULL;
|
|
}
|
|
else
|
|
{
|
|
ssl->hostname = mbedtls_calloc( 1, hostname_len + 1 );
|
|
if( ssl->hostname == NULL )
|
|
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
|
|
|
|
memcpy( ssl->hostname, hostname, hostname_len );
|
|
|
|
ssl->hostname[hostname_len] = '\0';
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_X509_CRT_PARSE_C */
|
|
|
|
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
|
|
void mbedtls_ssl_conf_sni( mbedtls_ssl_config *conf,
|
|
int (*f_sni)(void *, mbedtls_ssl_context *,
|
|
const unsigned char *, size_t),
|
|
void *p_sni )
|
|
{
|
|
conf->f_sni = f_sni;
|
|
conf->p_sni = p_sni;
|
|
}
|
|
#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
|
|
|
|
#if defined(MBEDTLS_SSL_ALPN)
|
|
int mbedtls_ssl_conf_alpn_protocols( mbedtls_ssl_config *conf, const char **protos )
|
|
{
|
|
size_t cur_len, tot_len;
|
|
const char **p;
|
|
|
|
/*
|
|
* RFC 7301 3.1: "Empty strings MUST NOT be included and byte strings
|
|
* MUST NOT be truncated."
|
|
* We check lengths now rather than later.
|
|
*/
|
|
tot_len = 0;
|
|
for( p = protos; *p != NULL; p++ )
|
|
{
|
|
cur_len = strlen( *p );
|
|
tot_len += cur_len;
|
|
|
|
if( cur_len == 0 || cur_len > 255 || tot_len > 65535 )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
conf->alpn_list = protos;
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
const char *mbedtls_ssl_get_alpn_protocol( const mbedtls_ssl_context *ssl )
|
|
{
|
|
return( ssl->alpn_chosen );
|
|
}
|
|
#endif /* MBEDTLS_SSL_ALPN */
|
|
|
|
void mbedtls_ssl_conf_max_version( mbedtls_ssl_config *conf, int major, int minor )
|
|
{
|
|
conf->max_major_ver = major;
|
|
conf->max_minor_ver = minor;
|
|
}
|
|
|
|
void mbedtls_ssl_conf_min_version( mbedtls_ssl_config *conf, int major, int minor )
|
|
{
|
|
conf->min_major_ver = major;
|
|
conf->min_minor_ver = minor;
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_FALLBACK_SCSV) && defined(MBEDTLS_SSL_CLI_C)
|
|
void mbedtls_ssl_conf_fallback( mbedtls_ssl_config *conf, char fallback )
|
|
{
|
|
conf->fallback = fallback;
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_SRV_C)
|
|
void mbedtls_ssl_conf_cert_req_ca_list( mbedtls_ssl_config *conf,
|
|
char cert_req_ca_list )
|
|
{
|
|
conf->cert_req_ca_list = cert_req_ca_list;
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
|
|
void mbedtls_ssl_conf_encrypt_then_mac( mbedtls_ssl_config *conf, char etm )
|
|
{
|
|
conf->encrypt_then_mac = etm;
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
|
|
void mbedtls_ssl_conf_extended_master_secret( mbedtls_ssl_config *conf, char ems )
|
|
{
|
|
conf->extended_ms = ems;
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_ARC4_C)
|
|
void mbedtls_ssl_conf_arc4_support( mbedtls_ssl_config *conf, char arc4 )
|
|
{
|
|
conf->arc4_disabled = arc4;
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
|
|
int mbedtls_ssl_conf_max_frag_len( mbedtls_ssl_config *conf, unsigned char mfl_code )
|
|
{
|
|
if( mfl_code >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID ||
|
|
mfl_code_to_length[mfl_code] > MBEDTLS_SSL_MAX_CONTENT_LEN )
|
|
{
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
conf->mfl_code = mfl_code;
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
|
|
|
|
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
|
|
void mbedtls_ssl_conf_truncated_hmac( mbedtls_ssl_config *conf, int truncate )
|
|
{
|
|
conf->trunc_hmac = truncate;
|
|
}
|
|
#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
|
|
|
|
#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
|
|
void mbedtls_ssl_conf_cbc_record_splitting( mbedtls_ssl_config *conf, char split )
|
|
{
|
|
conf->cbc_record_splitting = split;
|
|
}
|
|
#endif
|
|
|
|
void mbedtls_ssl_conf_legacy_renegotiation( mbedtls_ssl_config *conf, int allow_legacy )
|
|
{
|
|
conf->allow_legacy_renegotiation = allow_legacy;
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
void mbedtls_ssl_conf_renegotiation( mbedtls_ssl_config *conf, int renegotiation )
|
|
{
|
|
conf->disable_renegotiation = renegotiation;
|
|
}
|
|
|
|
void mbedtls_ssl_conf_renegotiation_enforced( mbedtls_ssl_config *conf, int max_records )
|
|
{
|
|
conf->renego_max_records = max_records;
|
|
}
|
|
|
|
void mbedtls_ssl_conf_renegotiation_period( mbedtls_ssl_config *conf,
|
|
const unsigned char period[8] )
|
|
{
|
|
memcpy( conf->renego_period, period, 8 );
|
|
}
|
|
#endif /* MBEDTLS_SSL_RENEGOTIATION */
|
|
|
|
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
|
|
#if defined(MBEDTLS_SSL_CLI_C)
|
|
void mbedtls_ssl_conf_session_tickets( mbedtls_ssl_config *conf, int use_tickets )
|
|
{
|
|
conf->session_tickets = use_tickets;
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_SRV_C)
|
|
void mbedtls_ssl_conf_session_tickets_cb( mbedtls_ssl_config *conf,
|
|
mbedtls_ssl_ticket_write_t *f_ticket_write,
|
|
mbedtls_ssl_ticket_parse_t *f_ticket_parse,
|
|
void *p_ticket )
|
|
{
|
|
conf->f_ticket_write = f_ticket_write;
|
|
conf->f_ticket_parse = f_ticket_parse;
|
|
conf->p_ticket = p_ticket;
|
|
}
|
|
#endif
|
|
#endif /* MBEDTLS_SSL_SESSION_TICKETS */
|
|
|
|
#if defined(MBEDTLS_SSL_EXPORT_KEYS)
|
|
void mbedtls_ssl_conf_export_keys_cb( mbedtls_ssl_config *conf,
|
|
mbedtls_ssl_export_keys_t *f_export_keys,
|
|
void *p_export_keys )
|
|
{
|
|
conf->f_export_keys = f_export_keys;
|
|
conf->p_export_keys = p_export_keys;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* SSL get accessors
|
|
*/
|
|
size_t mbedtls_ssl_get_bytes_avail( const mbedtls_ssl_context *ssl )
|
|
{
|
|
return( ssl->in_offt == NULL ? 0 : ssl->in_msglen );
|
|
}
|
|
|
|
uint32_t mbedtls_ssl_get_verify_result( const mbedtls_ssl_context *ssl )
|
|
{
|
|
if( ssl->session != NULL )
|
|
return( ssl->session->verify_result );
|
|
|
|
if( ssl->session_negotiate != NULL )
|
|
return( ssl->session_negotiate->verify_result );
|
|
|
|
return( 0xFFFFFFFF );
|
|
}
|
|
|
|
const char *mbedtls_ssl_get_ciphersuite( const mbedtls_ssl_context *ssl )
|
|
{
|
|
if( ssl == NULL || ssl->session == NULL )
|
|
return( NULL );
|
|
|
|
return mbedtls_ssl_get_ciphersuite_name( ssl->session->ciphersuite );
|
|
}
|
|
|
|
const char *mbedtls_ssl_get_version( const mbedtls_ssl_context *ssl )
|
|
{
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
{
|
|
switch( ssl->minor_ver )
|
|
{
|
|
case MBEDTLS_SSL_MINOR_VERSION_2:
|
|
return( "DTLSv1.0" );
|
|
|
|
case MBEDTLS_SSL_MINOR_VERSION_3:
|
|
return( "DTLSv1.2" );
|
|
|
|
default:
|
|
return( "unknown (DTLS)" );
|
|
}
|
|
}
|
|
#endif
|
|
|
|
switch( ssl->minor_ver )
|
|
{
|
|
case MBEDTLS_SSL_MINOR_VERSION_0:
|
|
return( "SSLv3.0" );
|
|
|
|
case MBEDTLS_SSL_MINOR_VERSION_1:
|
|
return( "TLSv1.0" );
|
|
|
|
case MBEDTLS_SSL_MINOR_VERSION_2:
|
|
return( "TLSv1.1" );
|
|
|
|
case MBEDTLS_SSL_MINOR_VERSION_3:
|
|
return( "TLSv1.2" );
|
|
|
|
default:
|
|
return( "unknown" );
|
|
}
|
|
}
|
|
|
|
int mbedtls_ssl_get_record_expansion( const mbedtls_ssl_context *ssl )
|
|
{
|
|
size_t transform_expansion = 0;
|
|
const mbedtls_ssl_transform *transform = ssl->transform_out;
|
|
unsigned block_size;
|
|
|
|
if( transform == NULL )
|
|
return( (int) mbedtls_ssl_hdr_len( ssl ) );
|
|
|
|
#if defined(MBEDTLS_ZLIB_SUPPORT)
|
|
if( ssl->session_out->compression != MBEDTLS_SSL_COMPRESS_NULL )
|
|
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
|
|
#endif
|
|
|
|
switch( mbedtls_cipher_get_cipher_mode( &transform->cipher_ctx_enc ) )
|
|
{
|
|
case MBEDTLS_MODE_GCM:
|
|
case MBEDTLS_MODE_CCM:
|
|
case MBEDTLS_MODE_STREAM:
|
|
transform_expansion = transform->minlen;
|
|
break;
|
|
|
|
case MBEDTLS_MODE_CBC:
|
|
|
|
block_size = mbedtls_cipher_get_block_size(
|
|
&transform->cipher_ctx_enc );
|
|
|
|
/* Expansion due to the addition of the MAC. */
|
|
transform_expansion += transform->maclen;
|
|
|
|
/* Expansion due to the addition of CBC padding;
|
|
* Theoretically up to 256 bytes, but we never use
|
|
* more than the block size of the underlying cipher. */
|
|
transform_expansion += block_size;
|
|
|
|
/* For TLS 1.1 or higher, an explicit IV is added
|
|
* after the record header. */
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
|
|
transform_expansion += block_size;
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
|
|
break;
|
|
|
|
default:
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
return( (int)( mbedtls_ssl_hdr_len( ssl ) + transform_expansion ) );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
|
|
size_t mbedtls_ssl_get_max_frag_len( const mbedtls_ssl_context *ssl )
|
|
{
|
|
size_t max_len;
|
|
|
|
/*
|
|
* Assume mfl_code is correct since it was checked when set
|
|
*/
|
|
max_len = mfl_code_to_length[ssl->conf->mfl_code];
|
|
|
|
/*
|
|
* Check if a smaller max length was negotiated
|
|
*/
|
|
if( ssl->session_out != NULL &&
|
|
mfl_code_to_length[ssl->session_out->mfl_code] < max_len )
|
|
{
|
|
max_len = mfl_code_to_length[ssl->session_out->mfl_code];
|
|
}
|
|
|
|
return max_len;
|
|
}
|
|
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
|
|
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
|
const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert( const mbedtls_ssl_context *ssl )
|
|
{
|
|
if( ssl == NULL || ssl->session == NULL )
|
|
return( NULL );
|
|
|
|
return( ssl->session->peer_cert );
|
|
}
|
|
#endif /* MBEDTLS_X509_CRT_PARSE_C */
|
|
|
|
#if defined(MBEDTLS_SSL_CLI_C)
|
|
int mbedtls_ssl_get_session( const mbedtls_ssl_context *ssl, mbedtls_ssl_session *dst )
|
|
{
|
|
if( ssl == NULL ||
|
|
dst == NULL ||
|
|
ssl->session == NULL ||
|
|
ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT )
|
|
{
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
return( ssl_session_copy( dst, ssl->session ) );
|
|
}
|
|
#endif /* MBEDTLS_SSL_CLI_C */
|
|
|
|
/*
|
|
* Perform a single step of the SSL handshake
|
|
*/
|
|
int mbedtls_ssl_handshake_step( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
|
|
|
|
if( ssl == NULL || ssl->conf == NULL )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
#if defined(MBEDTLS_SSL_CLI_C)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
|
|
ret = mbedtls_ssl_handshake_client_step( ssl );
|
|
#endif
|
|
#if defined(MBEDTLS_SSL_SRV_C)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
|
|
ret = mbedtls_ssl_handshake_server_step( ssl );
|
|
#endif
|
|
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* Perform the SSL handshake
|
|
*/
|
|
int mbedtls_ssl_handshake( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = 0;
|
|
|
|
if( ssl == NULL || ssl->conf == NULL )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> handshake" ) );
|
|
|
|
while( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
|
|
{
|
|
ret = mbedtls_ssl_handshake_step( ssl );
|
|
|
|
if( ret != 0 )
|
|
break;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= handshake" ) );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
#if defined(MBEDTLS_SSL_SRV_C)
|
|
/*
|
|
* Write HelloRequest to request renegotiation on server
|
|
*/
|
|
static int ssl_write_hello_request( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello request" ) );
|
|
|
|
ssl->out_msglen = 4;
|
|
ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
|
|
ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_REQUEST;
|
|
|
|
if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello request" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_SSL_SRV_C */
|
|
|
|
/*
|
|
* Actually renegotiate current connection, triggered by either:
|
|
* - any side: calling mbedtls_ssl_renegotiate(),
|
|
* - client: receiving a HelloRequest during mbedtls_ssl_read(),
|
|
* - server: receiving any handshake message on server during mbedtls_ssl_read() after
|
|
* the initial handshake is completed.
|
|
* If the handshake doesn't complete due to waiting for I/O, it will continue
|
|
* during the next calls to mbedtls_ssl_renegotiate() or mbedtls_ssl_read() respectively.
|
|
*/
|
|
static int ssl_start_renegotiation( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> renegotiate" ) );
|
|
|
|
if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
|
|
return( ret );
|
|
|
|
/* RFC 6347 4.2.2: "[...] the HelloRequest will have message_seq = 0 and
|
|
* the ServerHello will have message_seq = 1" */
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
|
|
ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
|
|
{
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
|
|
ssl->handshake->out_msg_seq = 1;
|
|
else
|
|
ssl->handshake->in_msg_seq = 1;
|
|
}
|
|
#endif
|
|
|
|
ssl->state = MBEDTLS_SSL_HELLO_REQUEST;
|
|
ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS;
|
|
|
|
if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
|
|
return( ret );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= renegotiate" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Renegotiate current connection on client,
|
|
* or request renegotiation on server
|
|
*/
|
|
int mbedtls_ssl_renegotiate( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
|
|
|
|
if( ssl == NULL || ssl->conf == NULL )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
#if defined(MBEDTLS_SSL_SRV_C)
|
|
/* On server, just send the request */
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
|
|
{
|
|
if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING;
|
|
|
|
/* Did we already try/start sending HelloRequest? */
|
|
if( ssl->out_left != 0 )
|
|
return( mbedtls_ssl_flush_output( ssl ) );
|
|
|
|
return( ssl_write_hello_request( ssl ) );
|
|
}
|
|
#endif /* MBEDTLS_SSL_SRV_C */
|
|
|
|
#if defined(MBEDTLS_SSL_CLI_C)
|
|
/*
|
|
* On client, either start the renegotiation process or,
|
|
* if already in progress, continue the handshake
|
|
*/
|
|
if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
|
|
{
|
|
if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
if( ( ret = ssl_start_renegotiation( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_SSL_CLI_C */
|
|
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* Check record counters and renegotiate if they're above the limit.
|
|
*/
|
|
static int ssl_check_ctr_renegotiate( mbedtls_ssl_context *ssl )
|
|
{
|
|
size_t ep_len = ssl_ep_len( ssl );
|
|
int in_ctr_cmp;
|
|
int out_ctr_cmp;
|
|
|
|
if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ||
|
|
ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ||
|
|
ssl->conf->disable_renegotiation == MBEDTLS_SSL_RENEGOTIATION_DISABLED )
|
|
{
|
|
return( 0 );
|
|
}
|
|
|
|
in_ctr_cmp = memcmp( ssl->in_ctr + ep_len,
|
|
ssl->conf->renego_period + ep_len, 8 - ep_len );
|
|
out_ctr_cmp = memcmp( ssl->out_ctr + ep_len,
|
|
ssl->conf->renego_period + ep_len, 8 - ep_len );
|
|
|
|
if( in_ctr_cmp <= 0 && out_ctr_cmp <= 0 )
|
|
{
|
|
return( 0 );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "record counter limit reached: renegotiate" ) );
|
|
return( mbedtls_ssl_renegotiate( ssl ) );
|
|
}
|
|
#endif /* MBEDTLS_SSL_RENEGOTIATION */
|
|
|
|
/*
|
|
* Receive application data decrypted from the SSL layer
|
|
*/
|
|
int mbedtls_ssl_read( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
|
|
{
|
|
int ret;
|
|
size_t n;
|
|
|
|
if( ssl == NULL || ssl->conf == NULL )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read" ) );
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
{
|
|
if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
|
|
return( ret );
|
|
|
|
if( ssl->handshake != NULL &&
|
|
ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
|
|
{
|
|
if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
|
|
return( ret );
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Check if renegotiation is necessary and/or handshake is
|
|
* in process. If yes, perform/continue, and fall through
|
|
* if an unexpected packet is received while the client
|
|
* is waiting for the ServerHello.
|
|
*
|
|
* (There is no equivalent to the last condition on
|
|
* the server-side as it is not treated as within
|
|
* a handshake while waiting for the ClientHello
|
|
* after a renegotiation request.)
|
|
*/
|
|
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
ret = ssl_check_ctr_renegotiate( ssl );
|
|
if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO &&
|
|
ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret );
|
|
return( ret );
|
|
}
|
|
#endif
|
|
|
|
if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
|
|
{
|
|
ret = mbedtls_ssl_handshake( ssl );
|
|
if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO &&
|
|
ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
if( ssl->in_offt == NULL )
|
|
{
|
|
/* Start timer if not already running */
|
|
if( ssl->f_get_timer != NULL &&
|
|
ssl->f_get_timer( ssl->p_timer ) == -1 )
|
|
{
|
|
ssl_set_timer( ssl, ssl->conf->read_timeout );
|
|
}
|
|
|
|
if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
|
|
{
|
|
if( ret == MBEDTLS_ERR_SSL_CONN_EOF )
|
|
return( 0 );
|
|
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ssl->in_msglen == 0 &&
|
|
ssl->in_msgtype == MBEDTLS_SSL_MSG_APPLICATION_DATA )
|
|
{
|
|
/*
|
|
* OpenSSL sends empty messages to randomize the IV
|
|
*/
|
|
if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
|
|
{
|
|
if( ret == MBEDTLS_ERR_SSL_CONN_EOF )
|
|
return( 0 );
|
|
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "received handshake message" ) );
|
|
|
|
/*
|
|
* - For client-side, expect SERVER_HELLO_REQUEST.
|
|
* - For server-side, expect CLIENT_HELLO.
|
|
* - Fail (TLS) or silently drop record (DTLS) in other cases.
|
|
*/
|
|
|
|
#if defined(MBEDTLS_SSL_CLI_C)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
|
|
( ssl->in_msg[0] != MBEDTLS_SSL_HS_HELLO_REQUEST ||
|
|
ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake received (not HelloRequest)" ) );
|
|
|
|
/* With DTLS, drop the packet (probably from last handshake) */
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
return( MBEDTLS_ERR_SSL_WANT_READ );
|
|
#endif
|
|
return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
|
|
}
|
|
#endif /* MBEDTLS_SSL_CLI_C */
|
|
|
|
#if defined(MBEDTLS_SSL_SRV_C)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
|
|
ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_HELLO )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake received (not ClientHello)" ) );
|
|
|
|
/* With DTLS, drop the packet (probably from last handshake) */
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
return( MBEDTLS_ERR_SSL_WANT_READ );
|
|
#endif
|
|
return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
|
|
}
|
|
#endif /* MBEDTLS_SSL_SRV_C */
|
|
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
/* Determine whether renegotiation attempt should be accepted */
|
|
if( ! ( ssl->conf->disable_renegotiation == MBEDTLS_SSL_RENEGOTIATION_DISABLED ||
|
|
( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
|
|
ssl->conf->allow_legacy_renegotiation ==
|
|
MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION ) ) )
|
|
{
|
|
/*
|
|
* Accept renegotiation request
|
|
*/
|
|
|
|
/* DTLS clients need to know renego is server-initiated */
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
|
|
ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
|
|
{
|
|
ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING;
|
|
}
|
|
#endif
|
|
ret = ssl_start_renegotiation( ssl );
|
|
if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO &&
|
|
ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_RENEGOTIATION */
|
|
{
|
|
/*
|
|
* Refuse renegotiation
|
|
*/
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "refusing renegotiation, sending alert" ) );
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
|
|
{
|
|
/* SSLv3 does not have a "no_renegotiation" warning, so
|
|
we send a fatal alert and abort the connection. */
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
|
|
return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_PROTO_SSL3 */
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
|
|
{
|
|
if( ( ret = mbedtls_ssl_send_alert_message( ssl,
|
|
MBEDTLS_SSL_ALERT_LEVEL_WARNING,
|
|
MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 ||
|
|
MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
}
|
|
|
|
return( MBEDTLS_ERR_SSL_WANT_READ );
|
|
}
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
|
|
{
|
|
if( ssl->conf->renego_max_records >= 0 )
|
|
{
|
|
if( ++ssl->renego_records_seen > ssl->conf->renego_max_records )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation requested, "
|
|
"but not honored by client" ) );
|
|
return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
|
|
}
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_SSL_RENEGOTIATION */
|
|
|
|
/* Fatal and closure alerts handled by mbedtls_ssl_read_record() */
|
|
if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "ignoring non-fatal non-closure alert" ) );
|
|
return( MBEDTLS_ERR_SSL_WANT_READ );
|
|
}
|
|
|
|
if( ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad application data message" ) );
|
|
return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
|
|
}
|
|
|
|
ssl->in_offt = ssl->in_msg;
|
|
|
|
/* We're going to return something now, cancel timer,
|
|
* except if handshake (renegotiation) is in progress */
|
|
if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
|
|
ssl_set_timer( ssl, 0 );
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
/* If we requested renego but received AppData, resend HelloRequest.
|
|
* Do it now, after setting in_offt, to avoid taking this branch
|
|
* again if ssl_write_hello_request() returns WANT_WRITE */
|
|
#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
|
|
ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
|
|
{
|
|
if( ( ret = ssl_resend_hello_request( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_resend_hello_request", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
|
|
#endif /* MBEDTLS_SSL_PROTO_DTLS */
|
|
}
|
|
|
|
n = ( len < ssl->in_msglen )
|
|
? len : ssl->in_msglen;
|
|
|
|
memcpy( buf, ssl->in_offt, n );
|
|
ssl->in_msglen -= n;
|
|
|
|
if( ssl->in_msglen == 0 )
|
|
{
|
|
/* all bytes consumed */
|
|
ssl->in_offt = NULL;
|
|
ssl->keep_current_message = 0;
|
|
}
|
|
else
|
|
{
|
|
/* more data available */
|
|
ssl->in_offt += n;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read" ) );
|
|
|
|
return( (int) n );
|
|
}
|
|
|
|
/*
|
|
* Send application data to be encrypted by the SSL layer, taking care of max
|
|
* fragment length and buffer size.
|
|
*
|
|
* According to RFC 5246 Section 6.2.1:
|
|
*
|
|
* Zero-length fragments of Application data MAY be sent as they are
|
|
* potentially useful as a traffic analysis countermeasure.
|
|
*
|
|
* Therefore, it is possible that the input message length is 0 and the
|
|
* corresponding return code is 0 on success.
|
|
*/
|
|
static int ssl_write_real( mbedtls_ssl_context *ssl,
|
|
const unsigned char *buf, size_t len )
|
|
{
|
|
int ret;
|
|
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
|
|
size_t max_len = mbedtls_ssl_get_max_frag_len( ssl );
|
|
#else
|
|
size_t max_len = MBEDTLS_SSL_MAX_CONTENT_LEN;
|
|
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
|
|
if( len > max_len )
|
|
{
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "fragment larger than the (negotiated) "
|
|
"maximum fragment length: %d > %d",
|
|
len, max_len ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
else
|
|
#endif
|
|
len = max_len;
|
|
}
|
|
|
|
if( ssl->out_left != 0 )
|
|
{
|
|
/*
|
|
* The user has previously tried to send the data and
|
|
* MBEDTLS_ERR_SSL_WANT_WRITE or the message was only partially
|
|
* written. In this case, we expect the high-level write function
|
|
* (e.g. mbedtls_ssl_write()) to be called with the same parameters
|
|
*/
|
|
if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* The user is trying to send a message the first time, so we need to
|
|
* copy the data into the internal buffers and setup the data structure
|
|
* to keep track of partial writes
|
|
*/
|
|
ssl->out_msglen = len;
|
|
ssl->out_msgtype = MBEDTLS_SSL_MSG_APPLICATION_DATA;
|
|
memcpy( ssl->out_msg, buf, len );
|
|
|
|
if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
return( (int) len );
|
|
}
|
|
|
|
/*
|
|
* Write application data, doing 1/n-1 splitting if necessary.
|
|
*
|
|
* With non-blocking I/O, ssl_write_real() may return WANT_WRITE,
|
|
* then the caller will call us again with the same arguments, so
|
|
* remember whether we already did the split or not.
|
|
*/
|
|
#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
|
|
static int ssl_write_split( mbedtls_ssl_context *ssl,
|
|
const unsigned char *buf, size_t len )
|
|
{
|
|
int ret;
|
|
|
|
if( ssl->conf->cbc_record_splitting ==
|
|
MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED ||
|
|
len <= 1 ||
|
|
ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_1 ||
|
|
mbedtls_cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc )
|
|
!= MBEDTLS_MODE_CBC )
|
|
{
|
|
return( ssl_write_real( ssl, buf, len ) );
|
|
}
|
|
|
|
if( ssl->split_done == 0 )
|
|
{
|
|
if( ( ret = ssl_write_real( ssl, buf, 1 ) ) <= 0 )
|
|
return( ret );
|
|
ssl->split_done = 1;
|
|
}
|
|
|
|
if( ( ret = ssl_write_real( ssl, buf + 1, len - 1 ) ) <= 0 )
|
|
return( ret );
|
|
ssl->split_done = 0;
|
|
|
|
return( ret + 1 );
|
|
}
|
|
#endif /* MBEDTLS_SSL_CBC_RECORD_SPLITTING */
|
|
|
|
/*
|
|
* Write application data (public-facing wrapper)
|
|
*/
|
|
int mbedtls_ssl_write( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len )
|
|
{
|
|
int ret;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write" ) );
|
|
|
|
if( ssl == NULL || ssl->conf == NULL )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
if( ( ret = ssl_check_ctr_renegotiate( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret );
|
|
return( ret );
|
|
}
|
|
#endif
|
|
|
|
if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
|
|
{
|
|
if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
|
|
ret = ssl_write_split( ssl, buf, len );
|
|
#else
|
|
ret = ssl_write_real( ssl, buf, len );
|
|
#endif
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write" ) );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* Notify the peer that the connection is being closed
|
|
*/
|
|
int mbedtls_ssl_close_notify( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
if( ssl == NULL || ssl->conf == NULL )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write close notify" ) );
|
|
|
|
if( ssl->out_left != 0 )
|
|
return( mbedtls_ssl_flush_output( ssl ) );
|
|
|
|
if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
|
|
{
|
|
if( ( ret = mbedtls_ssl_send_alert_message( ssl,
|
|
MBEDTLS_SSL_ALERT_LEVEL_WARNING,
|
|
MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_send_alert_message", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write close notify" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
void mbedtls_ssl_transform_free( mbedtls_ssl_transform *transform )
|
|
{
|
|
if( transform == NULL )
|
|
return;
|
|
|
|
#if defined(MBEDTLS_ZLIB_SUPPORT)
|
|
deflateEnd( &transform->ctx_deflate );
|
|
inflateEnd( &transform->ctx_inflate );
|
|
#endif
|
|
|
|
mbedtls_cipher_free( &transform->cipher_ctx_enc );
|
|
mbedtls_cipher_free( &transform->cipher_ctx_dec );
|
|
|
|
mbedtls_md_free( &transform->md_ctx_enc );
|
|
mbedtls_md_free( &transform->md_ctx_dec );
|
|
|
|
mbedtls_zeroize( transform, sizeof( mbedtls_ssl_transform ) );
|
|
}
|
|
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
|
static void ssl_key_cert_free( mbedtls_ssl_key_cert *key_cert )
|
|
{
|
|
mbedtls_ssl_key_cert *cur = key_cert, *next;
|
|
|
|
while( cur != NULL )
|
|
{
|
|
next = cur->next;
|
|
mbedtls_free( cur );
|
|
cur = next;
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_X509_CRT_PARSE_C */
|
|
|
|
void mbedtls_ssl_handshake_free( mbedtls_ssl_handshake_params *handshake )
|
|
{
|
|
if( handshake == NULL )
|
|
return;
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_1)
|
|
mbedtls_md5_free( &handshake->fin_md5 );
|
|
mbedtls_sha1_free( &handshake->fin_sha1 );
|
|
#endif
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
mbedtls_sha256_free( &handshake->fin_sha256 );
|
|
#endif
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
mbedtls_sha512_free( &handshake->fin_sha512 );
|
|
#endif
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
|
|
#if defined(MBEDTLS_DHM_C)
|
|
mbedtls_dhm_free( &handshake->dhm_ctx );
|
|
#endif
|
|
#if defined(MBEDTLS_ECDH_C)
|
|
mbedtls_ecdh_free( &handshake->ecdh_ctx );
|
|
#endif
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
|
|
mbedtls_ecjpake_free( &handshake->ecjpake_ctx );
|
|
#if defined(MBEDTLS_SSL_CLI_C)
|
|
mbedtls_free( handshake->ecjpake_cache );
|
|
handshake->ecjpake_cache = NULL;
|
|
handshake->ecjpake_cache_len = 0;
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
|
|
defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
|
|
/* explicit void pointer cast for buggy MS compiler */
|
|
mbedtls_free( (void *) handshake->curves );
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
|
|
if( handshake->psk != NULL )
|
|
{
|
|
mbedtls_zeroize( handshake->psk, handshake->psk_len );
|
|
mbedtls_free( handshake->psk );
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
|
|
defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
|
|
/*
|
|
* Free only the linked list wrapper, not the keys themselves
|
|
* since the belong to the SNI callback
|
|
*/
|
|
if( handshake->sni_key_cert != NULL )
|
|
{
|
|
mbedtls_ssl_key_cert *cur = handshake->sni_key_cert, *next;
|
|
|
|
while( cur != NULL )
|
|
{
|
|
next = cur->next;
|
|
mbedtls_free( cur );
|
|
cur = next;
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_SERVER_NAME_INDICATION */
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
mbedtls_free( handshake->verify_cookie );
|
|
mbedtls_free( handshake->hs_msg );
|
|
ssl_flight_free( handshake->flight );
|
|
#endif
|
|
|
|
mbedtls_zeroize( handshake, sizeof( mbedtls_ssl_handshake_params ) );
|
|
}
|
|
|
|
void mbedtls_ssl_session_free( mbedtls_ssl_session *session )
|
|
{
|
|
if( session == NULL )
|
|
return;
|
|
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
|
if( session->peer_cert != NULL )
|
|
{
|
|
mbedtls_x509_crt_free( session->peer_cert );
|
|
mbedtls_free( session->peer_cert );
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
|
|
mbedtls_free( session->ticket );
|
|
#endif
|
|
|
|
mbedtls_zeroize( session, sizeof( mbedtls_ssl_session ) );
|
|
}
|
|
|
|
/*
|
|
* Free an SSL context
|
|
*/
|
|
void mbedtls_ssl_free( mbedtls_ssl_context *ssl )
|
|
{
|
|
if( ssl == NULL )
|
|
return;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> free" ) );
|
|
|
|
if( ssl->out_buf != NULL )
|
|
{
|
|
mbedtls_zeroize( ssl->out_buf, MBEDTLS_SSL_BUFFER_LEN );
|
|
mbedtls_free( ssl->out_buf );
|
|
}
|
|
|
|
if( ssl->in_buf != NULL )
|
|
{
|
|
mbedtls_zeroize( ssl->in_buf, MBEDTLS_SSL_BUFFER_LEN );
|
|
mbedtls_free( ssl->in_buf );
|
|
}
|
|
|
|
#if defined(MBEDTLS_ZLIB_SUPPORT)
|
|
if( ssl->compress_buf != NULL )
|
|
{
|
|
mbedtls_zeroize( ssl->compress_buf, MBEDTLS_SSL_BUFFER_LEN );
|
|
mbedtls_free( ssl->compress_buf );
|
|
}
|
|
#endif
|
|
|
|
if( ssl->transform )
|
|
{
|
|
mbedtls_ssl_transform_free( ssl->transform );
|
|
mbedtls_free( ssl->transform );
|
|
}
|
|
|
|
if( ssl->handshake )
|
|
{
|
|
mbedtls_ssl_handshake_free( ssl->handshake );
|
|
mbedtls_ssl_transform_free( ssl->transform_negotiate );
|
|
mbedtls_ssl_session_free( ssl->session_negotiate );
|
|
|
|
mbedtls_free( ssl->handshake );
|
|
mbedtls_free( ssl->transform_negotiate );
|
|
mbedtls_free( ssl->session_negotiate );
|
|
}
|
|
|
|
if( ssl->session )
|
|
{
|
|
mbedtls_ssl_session_free( ssl->session );
|
|
mbedtls_free( ssl->session );
|
|
}
|
|
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
|
if( ssl->hostname != NULL )
|
|
{
|
|
mbedtls_zeroize( ssl->hostname, strlen( ssl->hostname ) );
|
|
mbedtls_free( ssl->hostname );
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
|
|
if( mbedtls_ssl_hw_record_finish != NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_finish()" ) );
|
|
mbedtls_ssl_hw_record_finish( ssl );
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
|
|
mbedtls_free( ssl->cli_id );
|
|
#endif
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= free" ) );
|
|
|
|
/* Actually clear after last debug message */
|
|
mbedtls_zeroize( ssl, sizeof( mbedtls_ssl_context ) );
|
|
}
|
|
|
|
/*
|
|
* Initialze mbedtls_ssl_config
|
|
*/
|
|
void mbedtls_ssl_config_init( mbedtls_ssl_config *conf )
|
|
{
|
|
memset( conf, 0, sizeof( mbedtls_ssl_config ) );
|
|
}
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
|
|
static int ssl_preset_default_hashes[] = {
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
MBEDTLS_MD_SHA512,
|
|
MBEDTLS_MD_SHA384,
|
|
#endif
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
MBEDTLS_MD_SHA256,
|
|
MBEDTLS_MD_SHA224,
|
|
#endif
|
|
#if defined(MBEDTLS_SHA1_C) && defined(MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_KEY_EXCHANGE)
|
|
MBEDTLS_MD_SHA1,
|
|
#endif
|
|
MBEDTLS_MD_NONE
|
|
};
|
|
#endif
|
|
|
|
static int ssl_preset_suiteb_ciphersuites[] = {
|
|
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
|
|
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
|
|
0
|
|
};
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
|
|
static int ssl_preset_suiteb_hashes[] = {
|
|
MBEDTLS_MD_SHA256,
|
|
MBEDTLS_MD_SHA384,
|
|
MBEDTLS_MD_NONE
|
|
};
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_ECP_C)
|
|
static mbedtls_ecp_group_id ssl_preset_suiteb_curves[] = {
|
|
#if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED)
|
|
MBEDTLS_ECP_DP_SECP256R1,
|
|
#endif
|
|
#if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED)
|
|
MBEDTLS_ECP_DP_SECP384R1,
|
|
#endif
|
|
MBEDTLS_ECP_DP_NONE
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* Load default in mbedtls_ssl_config
|
|
*/
|
|
int mbedtls_ssl_config_defaults( mbedtls_ssl_config *conf,
|
|
int endpoint, int transport, int preset )
|
|
{
|
|
#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
|
|
int ret;
|
|
#endif
|
|
|
|
/* Use the functions here so that they are covered in tests,
|
|
* but otherwise access member directly for efficiency */
|
|
mbedtls_ssl_conf_endpoint( conf, endpoint );
|
|
mbedtls_ssl_conf_transport( conf, transport );
|
|
|
|
/*
|
|
* Things that are common to all presets
|
|
*/
|
|
#if defined(MBEDTLS_SSL_CLI_C)
|
|
if( endpoint == MBEDTLS_SSL_IS_CLIENT )
|
|
{
|
|
conf->authmode = MBEDTLS_SSL_VERIFY_REQUIRED;
|
|
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
|
|
conf->session_tickets = MBEDTLS_SSL_SESSION_TICKETS_ENABLED;
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_ARC4_C)
|
|
conf->arc4_disabled = MBEDTLS_SSL_ARC4_DISABLED;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
|
|
conf->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
|
|
conf->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
|
|
conf->cbc_record_splitting = MBEDTLS_SSL_CBC_RECORD_SPLITTING_ENABLED;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
|
|
conf->f_cookie_write = ssl_cookie_write_dummy;
|
|
conf->f_cookie_check = ssl_cookie_check_dummy;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
|
|
conf->anti_replay = MBEDTLS_SSL_ANTI_REPLAY_ENABLED;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_SRV_C)
|
|
conf->cert_req_ca_list = MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
conf->hs_timeout_min = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MIN;
|
|
conf->hs_timeout_max = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MAX;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
conf->renego_max_records = MBEDTLS_SSL_RENEGO_MAX_RECORDS_DEFAULT;
|
|
memset( conf->renego_period, 0x00, 2 );
|
|
memset( conf->renego_period + 2, 0xFF, 6 );
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
|
|
if( endpoint == MBEDTLS_SSL_IS_SERVER )
|
|
{
|
|
const unsigned char dhm_p[] =
|
|
MBEDTLS_DHM_RFC3526_MODP_2048_P_BIN;
|
|
const unsigned char dhm_g[] =
|
|
MBEDTLS_DHM_RFC3526_MODP_2048_G_BIN;
|
|
|
|
if ( ( ret = mbedtls_ssl_conf_dh_param_bin( conf,
|
|
dhm_p, sizeof( dhm_p ),
|
|
dhm_g, sizeof( dhm_g ) ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Preset-specific defaults
|
|
*/
|
|
switch( preset )
|
|
{
|
|
/*
|
|
* NSA Suite B
|
|
*/
|
|
case MBEDTLS_SSL_PRESET_SUITEB:
|
|
conf->min_major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
|
|
conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; /* TLS 1.2 */
|
|
conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION;
|
|
conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION;
|
|
|
|
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] =
|
|
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] =
|
|
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] =
|
|
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] =
|
|
ssl_preset_suiteb_ciphersuites;
|
|
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
|
conf->cert_profile = &mbedtls_x509_crt_profile_suiteb;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
|
|
conf->sig_hashes = ssl_preset_suiteb_hashes;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_ECP_C)
|
|
conf->curve_list = ssl_preset_suiteb_curves;
|
|
#endif
|
|
break;
|
|
|
|
/*
|
|
* Default
|
|
*/
|
|
default:
|
|
conf->min_major_ver = ( MBEDTLS_SSL_MIN_MAJOR_VERSION >
|
|
MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION ) ?
|
|
MBEDTLS_SSL_MIN_MAJOR_VERSION :
|
|
MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION;
|
|
conf->min_minor_ver = ( MBEDTLS_SSL_MIN_MINOR_VERSION >
|
|
MBEDTLS_SSL_MIN_VALID_MINOR_VERSION ) ?
|
|
MBEDTLS_SSL_MIN_MINOR_VERSION :
|
|
MBEDTLS_SSL_MIN_VALID_MINOR_VERSION;
|
|
conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION;
|
|
conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION;
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_2;
|
|
#endif
|
|
|
|
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] =
|
|
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] =
|
|
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] =
|
|
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] =
|
|
mbedtls_ssl_list_ciphersuites();
|
|
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
|
conf->cert_profile = &mbedtls_x509_crt_profile_default;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
|
|
conf->sig_hashes = ssl_preset_default_hashes;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_ECP_C)
|
|
conf->curve_list = mbedtls_ecp_grp_id_list();
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
|
|
conf->dhm_min_bitlen = 1024;
|
|
#endif
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Free mbedtls_ssl_config
|
|
*/
|
|
void mbedtls_ssl_config_free( mbedtls_ssl_config *conf )
|
|
{
|
|
#if defined(MBEDTLS_DHM_C)
|
|
mbedtls_mpi_free( &conf->dhm_P );
|
|
mbedtls_mpi_free( &conf->dhm_G );
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
|
|
if( conf->psk != NULL )
|
|
{
|
|
mbedtls_zeroize( conf->psk, conf->psk_len );
|
|
mbedtls_zeroize( conf->psk_identity, conf->psk_identity_len );
|
|
mbedtls_free( conf->psk );
|
|
mbedtls_free( conf->psk_identity );
|
|
conf->psk_len = 0;
|
|
conf->psk_identity_len = 0;
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
|
ssl_key_cert_free( conf->key_cert );
|
|
#endif
|
|
|
|
mbedtls_zeroize( conf, sizeof( mbedtls_ssl_config ) );
|
|
}
|
|
|
|
#if defined(MBEDTLS_PK_C) && \
|
|
( defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C) )
|
|
/*
|
|
* Convert between MBEDTLS_PK_XXX and SSL_SIG_XXX
|
|
*/
|
|
unsigned char mbedtls_ssl_sig_from_pk( mbedtls_pk_context *pk )
|
|
{
|
|
#if defined(MBEDTLS_RSA_C)
|
|
if( mbedtls_pk_can_do( pk, MBEDTLS_PK_RSA ) )
|
|
return( MBEDTLS_SSL_SIG_RSA );
|
|
#endif
|
|
#if defined(MBEDTLS_ECDSA_C)
|
|
if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECDSA ) )
|
|
return( MBEDTLS_SSL_SIG_ECDSA );
|
|
#endif
|
|
return( MBEDTLS_SSL_SIG_ANON );
|
|
}
|
|
|
|
unsigned char mbedtls_ssl_sig_from_pk_alg( mbedtls_pk_type_t type )
|
|
{
|
|
switch( type ) {
|
|
case MBEDTLS_PK_RSA:
|
|
return( MBEDTLS_SSL_SIG_RSA );
|
|
case MBEDTLS_PK_ECDSA:
|
|
case MBEDTLS_PK_ECKEY:
|
|
return( MBEDTLS_SSL_SIG_ECDSA );
|
|
default:
|
|
return( MBEDTLS_SSL_SIG_ANON );
|
|
}
|
|
}
|
|
|
|
mbedtls_pk_type_t mbedtls_ssl_pk_alg_from_sig( unsigned char sig )
|
|
{
|
|
switch( sig )
|
|
{
|
|
#if defined(MBEDTLS_RSA_C)
|
|
case MBEDTLS_SSL_SIG_RSA:
|
|
return( MBEDTLS_PK_RSA );
|
|
#endif
|
|
#if defined(MBEDTLS_ECDSA_C)
|
|
case MBEDTLS_SSL_SIG_ECDSA:
|
|
return( MBEDTLS_PK_ECDSA );
|
|
#endif
|
|
default:
|
|
return( MBEDTLS_PK_NONE );
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_PK_C && ( MBEDTLS_RSA_C || MBEDTLS_ECDSA_C ) */
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
|
|
defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
|
|
|
|
/* Find an entry in a signature-hash set matching a given hash algorithm. */
|
|
mbedtls_md_type_t mbedtls_ssl_sig_hash_set_find( mbedtls_ssl_sig_hash_set_t *set,
|
|
mbedtls_pk_type_t sig_alg )
|
|
{
|
|
switch( sig_alg )
|
|
{
|
|
case MBEDTLS_PK_RSA:
|
|
return( set->rsa );
|
|
case MBEDTLS_PK_ECDSA:
|
|
return( set->ecdsa );
|
|
default:
|
|
return( MBEDTLS_MD_NONE );
|
|
}
|
|
}
|
|
|
|
/* Add a signature-hash-pair to a signature-hash set */
|
|
void mbedtls_ssl_sig_hash_set_add( mbedtls_ssl_sig_hash_set_t *set,
|
|
mbedtls_pk_type_t sig_alg,
|
|
mbedtls_md_type_t md_alg )
|
|
{
|
|
switch( sig_alg )
|
|
{
|
|
case MBEDTLS_PK_RSA:
|
|
if( set->rsa == MBEDTLS_MD_NONE )
|
|
set->rsa = md_alg;
|
|
break;
|
|
|
|
case MBEDTLS_PK_ECDSA:
|
|
if( set->ecdsa == MBEDTLS_MD_NONE )
|
|
set->ecdsa = md_alg;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Allow exactly one hash algorithm for each signature. */
|
|
void mbedtls_ssl_sig_hash_set_const_hash( mbedtls_ssl_sig_hash_set_t *set,
|
|
mbedtls_md_type_t md_alg )
|
|
{
|
|
set->rsa = md_alg;
|
|
set->ecdsa = md_alg;
|
|
}
|
|
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2) &&
|
|
MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
|
|
|
|
/*
|
|
* Convert from MBEDTLS_SSL_HASH_XXX to MBEDTLS_MD_XXX
|
|
*/
|
|
mbedtls_md_type_t mbedtls_ssl_md_alg_from_hash( unsigned char hash )
|
|
{
|
|
switch( hash )
|
|
{
|
|
#if defined(MBEDTLS_MD5_C)
|
|
case MBEDTLS_SSL_HASH_MD5:
|
|
return( MBEDTLS_MD_MD5 );
|
|
#endif
|
|
#if defined(MBEDTLS_SHA1_C)
|
|
case MBEDTLS_SSL_HASH_SHA1:
|
|
return( MBEDTLS_MD_SHA1 );
|
|
#endif
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
case MBEDTLS_SSL_HASH_SHA224:
|
|
return( MBEDTLS_MD_SHA224 );
|
|
case MBEDTLS_SSL_HASH_SHA256:
|
|
return( MBEDTLS_MD_SHA256 );
|
|
#endif
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
case MBEDTLS_SSL_HASH_SHA384:
|
|
return( MBEDTLS_MD_SHA384 );
|
|
case MBEDTLS_SSL_HASH_SHA512:
|
|
return( MBEDTLS_MD_SHA512 );
|
|
#endif
|
|
default:
|
|
return( MBEDTLS_MD_NONE );
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Convert from MBEDTLS_MD_XXX to MBEDTLS_SSL_HASH_XXX
|
|
*/
|
|
unsigned char mbedtls_ssl_hash_from_md_alg( int md )
|
|
{
|
|
switch( md )
|
|
{
|
|
#if defined(MBEDTLS_MD5_C)
|
|
case MBEDTLS_MD_MD5:
|
|
return( MBEDTLS_SSL_HASH_MD5 );
|
|
#endif
|
|
#if defined(MBEDTLS_SHA1_C)
|
|
case MBEDTLS_MD_SHA1:
|
|
return( MBEDTLS_SSL_HASH_SHA1 );
|
|
#endif
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
case MBEDTLS_MD_SHA224:
|
|
return( MBEDTLS_SSL_HASH_SHA224 );
|
|
case MBEDTLS_MD_SHA256:
|
|
return( MBEDTLS_SSL_HASH_SHA256 );
|
|
#endif
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
case MBEDTLS_MD_SHA384:
|
|
return( MBEDTLS_SSL_HASH_SHA384 );
|
|
case MBEDTLS_MD_SHA512:
|
|
return( MBEDTLS_SSL_HASH_SHA512 );
|
|
#endif
|
|
default:
|
|
return( MBEDTLS_SSL_HASH_NONE );
|
|
}
|
|
}
|
|
|
|
#if defined(MBEDTLS_ECP_C)
|
|
/*
|
|
* Check if a curve proposed by the peer is in our list.
|
|
* Return 0 if we're willing to use it, -1 otherwise.
|
|
*/
|
|
int mbedtls_ssl_check_curve( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id )
|
|
{
|
|
const mbedtls_ecp_group_id *gid;
|
|
|
|
if( ssl->conf->curve_list == NULL )
|
|
return( -1 );
|
|
|
|
for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ )
|
|
if( *gid == grp_id )
|
|
return( 0 );
|
|
|
|
return( -1 );
|
|
}
|
|
#endif /* MBEDTLS_ECP_C */
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
|
|
/*
|
|
* Check if a hash proposed by the peer is in our list.
|
|
* Return 0 if we're willing to use it, -1 otherwise.
|
|
*/
|
|
int mbedtls_ssl_check_sig_hash( const mbedtls_ssl_context *ssl,
|
|
mbedtls_md_type_t md )
|
|
{
|
|
const int *cur;
|
|
|
|
if( ssl->conf->sig_hashes == NULL )
|
|
return( -1 );
|
|
|
|
for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ )
|
|
if( *cur == (int) md )
|
|
return( 0 );
|
|
|
|
return( -1 );
|
|
}
|
|
#endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
|
|
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
|
int mbedtls_ssl_check_cert_usage( const mbedtls_x509_crt *cert,
|
|
const mbedtls_ssl_ciphersuite_t *ciphersuite,
|
|
int cert_endpoint,
|
|
uint32_t *flags )
|
|
{
|
|
int ret = 0;
|
|
#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
|
|
int usage = 0;
|
|
#endif
|
|
#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
|
|
const char *ext_oid;
|
|
size_t ext_len;
|
|
#endif
|
|
|
|
#if !defined(MBEDTLS_X509_CHECK_KEY_USAGE) && \
|
|
!defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
|
|
((void) cert);
|
|
((void) cert_endpoint);
|
|
((void) flags);
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
|
|
if( cert_endpoint == MBEDTLS_SSL_IS_SERVER )
|
|
{
|
|
/* Server part of the key exchange */
|
|
switch( ciphersuite->key_exchange )
|
|
{
|
|
case MBEDTLS_KEY_EXCHANGE_RSA:
|
|
case MBEDTLS_KEY_EXCHANGE_RSA_PSK:
|
|
usage = MBEDTLS_X509_KU_KEY_ENCIPHERMENT;
|
|
break;
|
|
|
|
case MBEDTLS_KEY_EXCHANGE_DHE_RSA:
|
|
case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA:
|
|
case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA:
|
|
usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
|
|
break;
|
|
|
|
case MBEDTLS_KEY_EXCHANGE_ECDH_RSA:
|
|
case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA:
|
|
usage = MBEDTLS_X509_KU_KEY_AGREEMENT;
|
|
break;
|
|
|
|
/* Don't use default: we want warnings when adding new values */
|
|
case MBEDTLS_KEY_EXCHANGE_NONE:
|
|
case MBEDTLS_KEY_EXCHANGE_PSK:
|
|
case MBEDTLS_KEY_EXCHANGE_DHE_PSK:
|
|
case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK:
|
|
case MBEDTLS_KEY_EXCHANGE_ECJPAKE:
|
|
usage = 0;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Client auth: we only implement rsa_sign and mbedtls_ecdsa_sign for now */
|
|
usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
|
|
}
|
|
|
|
if( mbedtls_x509_crt_check_key_usage( cert, usage ) != 0 )
|
|
{
|
|
*flags |= MBEDTLS_X509_BADCERT_KEY_USAGE;
|
|
ret = -1;
|
|
}
|
|
#else
|
|
((void) ciphersuite);
|
|
#endif /* MBEDTLS_X509_CHECK_KEY_USAGE */
|
|
|
|
#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
|
|
if( cert_endpoint == MBEDTLS_SSL_IS_SERVER )
|
|
{
|
|
ext_oid = MBEDTLS_OID_SERVER_AUTH;
|
|
ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_SERVER_AUTH );
|
|
}
|
|
else
|
|
{
|
|
ext_oid = MBEDTLS_OID_CLIENT_AUTH;
|
|
ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_CLIENT_AUTH );
|
|
}
|
|
|
|
if( mbedtls_x509_crt_check_extended_key_usage( cert, ext_oid, ext_len ) != 0 )
|
|
{
|
|
*flags |= MBEDTLS_X509_BADCERT_EXT_KEY_USAGE;
|
|
ret = -1;
|
|
}
|
|
#endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */
|
|
|
|
return( ret );
|
|
}
|
|
#endif /* MBEDTLS_X509_CRT_PARSE_C */
|
|
|
|
/*
|
|
* Convert version numbers to/from wire format
|
|
* and, for DTLS, to/from TLS equivalent.
|
|
*
|
|
* For TLS this is the identity.
|
|
* For DTLS, use 1's complement (v -> 255 - v, and then map as follows:
|
|
* 1.0 <-> 3.2 (DTLS 1.0 is based on TLS 1.1)
|
|
* 1.x <-> 3.x+1 for x != 0 (DTLS 1.2 based on TLS 1.2)
|
|
*/
|
|
void mbedtls_ssl_write_version( int major, int minor, int transport,
|
|
unsigned char ver[2] )
|
|
{
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
{
|
|
if( minor == MBEDTLS_SSL_MINOR_VERSION_2 )
|
|
--minor; /* DTLS 1.0 stored as TLS 1.1 internally */
|
|
|
|
ver[0] = (unsigned char)( 255 - ( major - 2 ) );
|
|
ver[1] = (unsigned char)( 255 - ( minor - 1 ) );
|
|
}
|
|
else
|
|
#else
|
|
((void) transport);
|
|
#endif
|
|
{
|
|
ver[0] = (unsigned char) major;
|
|
ver[1] = (unsigned char) minor;
|
|
}
|
|
}
|
|
|
|
void mbedtls_ssl_read_version( int *major, int *minor, int transport,
|
|
const unsigned char ver[2] )
|
|
{
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
{
|
|
*major = 255 - ver[0] + 2;
|
|
*minor = 255 - ver[1] + 1;
|
|
|
|
if( *minor == MBEDTLS_SSL_MINOR_VERSION_1 )
|
|
++*minor; /* DTLS 1.0 stored as TLS 1.1 internally */
|
|
}
|
|
else
|
|
#else
|
|
((void) transport);
|
|
#endif
|
|
{
|
|
*major = ver[0];
|
|
*minor = ver[1];
|
|
}
|
|
}
|
|
|
|
int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md )
|
|
{
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
|
|
return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
|
|
|
|
switch( md )
|
|
{
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
|
|
#if defined(MBEDTLS_MD5_C)
|
|
case MBEDTLS_SSL_HASH_MD5:
|
|
return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
|
|
#endif
|
|
#if defined(MBEDTLS_SHA1_C)
|
|
case MBEDTLS_SSL_HASH_SHA1:
|
|
ssl->handshake->calc_verify = ssl_calc_verify_tls;
|
|
break;
|
|
#endif
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
|
|
#if defined(MBEDTLS_SHA512_C)
|
|
case MBEDTLS_SSL_HASH_SHA384:
|
|
ssl->handshake->calc_verify = ssl_calc_verify_tls_sha384;
|
|
break;
|
|
#endif
|
|
#if defined(MBEDTLS_SHA256_C)
|
|
case MBEDTLS_SSL_HASH_SHA256:
|
|
ssl->handshake->calc_verify = ssl_calc_verify_tls_sha256;
|
|
break;
|
|
#endif
|
|
default:
|
|
return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
|
|
}
|
|
|
|
return 0;
|
|
#else /* !MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
(void) ssl;
|
|
(void) md;
|
|
|
|
return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_1)
|
|
int mbedtls_ssl_get_key_exchange_md_ssl_tls( mbedtls_ssl_context *ssl,
|
|
unsigned char *output,
|
|
unsigned char *data, size_t data_len )
|
|
{
|
|
int ret = 0;
|
|
mbedtls_md5_context mbedtls_md5;
|
|
mbedtls_sha1_context mbedtls_sha1;
|
|
|
|
mbedtls_md5_init( &mbedtls_md5 );
|
|
mbedtls_sha1_init( &mbedtls_sha1 );
|
|
|
|
/*
|
|
* digitally-signed struct {
|
|
* opaque md5_hash[16];
|
|
* opaque sha_hash[20];
|
|
* };
|
|
*
|
|
* md5_hash
|
|
* MD5(ClientHello.random + ServerHello.random
|
|
* + ServerParams);
|
|
* sha_hash
|
|
* SHA(ClientHello.random + ServerHello.random
|
|
* + ServerParams);
|
|
*/
|
|
if( ( ret = mbedtls_md5_starts_ret( &mbedtls_md5 ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_starts_ret", ret );
|
|
goto exit;
|
|
}
|
|
if( ( ret = mbedtls_md5_update_ret( &mbedtls_md5,
|
|
ssl->handshake->randbytes, 64 ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_update_ret", ret );
|
|
goto exit;
|
|
}
|
|
if( ( ret = mbedtls_md5_update_ret( &mbedtls_md5, data, data_len ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_update_ret", ret );
|
|
goto exit;
|
|
}
|
|
if( ( ret = mbedtls_md5_finish_ret( &mbedtls_md5, output ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_finish_ret", ret );
|
|
goto exit;
|
|
}
|
|
|
|
if( ( ret = mbedtls_sha1_starts_ret( &mbedtls_sha1 ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_starts_ret", ret );
|
|
goto exit;
|
|
}
|
|
if( ( ret = mbedtls_sha1_update_ret( &mbedtls_sha1,
|
|
ssl->handshake->randbytes, 64 ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_update_ret", ret );
|
|
goto exit;
|
|
}
|
|
if( ( ret = mbedtls_sha1_update_ret( &mbedtls_sha1, data,
|
|
data_len ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_update_ret", ret );
|
|
goto exit;
|
|
}
|
|
if( ( ret = mbedtls_sha1_finish_ret( &mbedtls_sha1,
|
|
output + 16 ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_finish_ret", ret );
|
|
goto exit;
|
|
}
|
|
|
|
exit:
|
|
mbedtls_md5_free( &mbedtls_md5 );
|
|
mbedtls_sha1_free( &mbedtls_sha1 );
|
|
|
|
if( ret != 0 )
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
|
|
|
|
return( ret );
|
|
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \
|
|
MBEDTLS_SSL_PROTO_TLS1_1 */
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
int mbedtls_ssl_get_key_exchange_md_tls1_2( mbedtls_ssl_context *ssl,
|
|
unsigned char *output,
|
|
unsigned char *data, size_t data_len,
|
|
mbedtls_md_type_t md_alg )
|
|
{
|
|
int ret = 0;
|
|
mbedtls_md_context_t ctx;
|
|
const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( md_alg );
|
|
|
|
mbedtls_md_init( &ctx );
|
|
|
|
/*
|
|
* digitally-signed struct {
|
|
* opaque client_random[32];
|
|
* opaque server_random[32];
|
|
* ServerDHParams params;
|
|
* };
|
|
*/
|
|
if( ( ret = mbedtls_md_setup( &ctx, md_info, 0 ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret );
|
|
goto exit;
|
|
}
|
|
if( ( ret = mbedtls_md_starts( &ctx ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_starts", ret );
|
|
goto exit;
|
|
}
|
|
if( ( ret = mbedtls_md_update( &ctx, ssl->handshake->randbytes, 64 ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_update", ret );
|
|
goto exit;
|
|
}
|
|
if( ( ret = mbedtls_md_update( &ctx, data, data_len ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_update", ret );
|
|
goto exit;
|
|
}
|
|
if( ( ret = mbedtls_md_finish( &ctx, output ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_finish", ret );
|
|
goto exit;
|
|
}
|
|
|
|
exit:
|
|
mbedtls_md_free( &ctx );
|
|
|
|
if( ret != 0 )
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
|
|
|
|
return( ret );
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
|
|
MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
|
|
#endif /* MBEDTLS_SSL_TLS_C */
|