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![Thomas Faber](/assets/img/avatar_default.png)
Note: this disables the MBEDTLS_DEPRECATED_REMOVED configuration value, because we require the now-deprecated MD5 & SHA functions for bcrypt.
4132 lines
138 KiB
C
4132 lines
138 KiB
C
/*
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* SSLv3/TLSv1 server-side 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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#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_SRV_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_ECP_C)
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#include "mbedtls/ecp.h"
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#endif
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#if defined(MBEDTLS_HAVE_TIME)
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#include "mbedtls/platform_time.h"
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#endif
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#if defined(MBEDTLS_SSL_SESSION_TICKETS)
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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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#endif
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#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
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int mbedtls_ssl_set_client_transport_id( mbedtls_ssl_context *ssl,
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const unsigned char *info,
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size_t ilen )
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{
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if( ssl->conf->endpoint != MBEDTLS_SSL_IS_SERVER )
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return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
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mbedtls_free( ssl->cli_id );
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if( ( ssl->cli_id = mbedtls_calloc( 1, ilen ) ) == NULL )
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return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
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memcpy( ssl->cli_id, info, ilen );
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ssl->cli_id_len = ilen;
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return( 0 );
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}
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void mbedtls_ssl_conf_dtls_cookies( mbedtls_ssl_config *conf,
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mbedtls_ssl_cookie_write_t *f_cookie_write,
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mbedtls_ssl_cookie_check_t *f_cookie_check,
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void *p_cookie )
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{
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conf->f_cookie_write = f_cookie_write;
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conf->f_cookie_check = f_cookie_check;
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conf->p_cookie = p_cookie;
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}
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#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
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#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
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static int ssl_parse_servername_ext( mbedtls_ssl_context *ssl,
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const unsigned char *buf,
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size_t len )
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{
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int ret;
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size_t servername_list_size, hostname_len;
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const unsigned char *p;
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MBEDTLS_SSL_DEBUG_MSG( 3, ( "parse ServerName extension" ) );
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if( len < 2 )
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{
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
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MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
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return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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servername_list_size = ( ( buf[0] << 8 ) | ( buf[1] ) );
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if( servername_list_size + 2 != len )
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{
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
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MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
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return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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p = buf + 2;
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while( servername_list_size > 2 )
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{
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hostname_len = ( ( p[1] << 8 ) | p[2] );
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if( hostname_len + 3 > servername_list_size )
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{
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
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MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
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return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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if( p[0] == MBEDTLS_TLS_EXT_SERVERNAME_HOSTNAME )
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{
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ret = ssl->conf->f_sni( ssl->conf->p_sni,
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ssl, p + 3, hostname_len );
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if( ret != 0 )
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{
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MBEDTLS_SSL_DEBUG_RET( 1, "ssl_sni_wrapper", ret );
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mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
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MBEDTLS_SSL_ALERT_MSG_UNRECOGNIZED_NAME );
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return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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return( 0 );
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}
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servername_list_size -= hostname_len + 3;
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p += hostname_len + 3;
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}
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if( servername_list_size != 0 )
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{
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
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MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
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return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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return( 0 );
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}
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#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
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static int ssl_parse_renegotiation_info( mbedtls_ssl_context *ssl,
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const unsigned char *buf,
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size_t len )
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{
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#if defined(MBEDTLS_SSL_RENEGOTIATION)
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if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
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{
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/* Check verify-data in constant-time. The length OTOH is no secret */
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if( len != 1 + ssl->verify_data_len ||
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buf[0] != ssl->verify_data_len ||
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mbedtls_ssl_safer_memcmp( buf + 1, ssl->peer_verify_data,
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ssl->verify_data_len ) != 0 )
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{
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching renegotiation info" ) );
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mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
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MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
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return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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}
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else
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#endif /* MBEDTLS_SSL_RENEGOTIATION */
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{
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if( len != 1 || buf[0] != 0x0 )
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{
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-zero length renegotiation info" ) );
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mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
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MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
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return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
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}
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return( 0 );
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}
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#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
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defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
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/*
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* Status of the implementation of signature-algorithms extension:
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*
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* Currently, we are only considering the signature-algorithm extension
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* to pick a ciphersuite which allows us to send the ServerKeyExchange
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* message with a signature-hash combination that the user allows.
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*
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* We do *not* check whether all certificates in our certificate
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* chain are signed with an allowed signature-hash pair.
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* This needs to be done at a later stage.
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*
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*/
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static int ssl_parse_signature_algorithms_ext( mbedtls_ssl_context *ssl,
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const unsigned char *buf,
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size_t len )
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{
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size_t sig_alg_list_size;
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const unsigned char *p;
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const unsigned char *end = buf + len;
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mbedtls_md_type_t md_cur;
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mbedtls_pk_type_t sig_cur;
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if ( len < 2 ) {
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
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MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
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return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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sig_alg_list_size = ( ( buf[0] << 8 ) | ( buf[1] ) );
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if( sig_alg_list_size + 2 != len ||
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sig_alg_list_size % 2 != 0 )
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{
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
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MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
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return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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/* Currently we only guarantee signing the ServerKeyExchange message according
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* to the constraints specified in this extension (see above), so it suffices
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* to remember only one suitable hash for each possible signature algorithm.
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*
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* This will change when we also consider certificate signatures,
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* in which case we will need to remember the whole signature-hash
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* pair list from the extension.
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*/
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for( p = buf + 2; p < end; p += 2 )
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{
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/* Silently ignore unknown signature or hash algorithms. */
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if( ( sig_cur = mbedtls_ssl_pk_alg_from_sig( p[1] ) ) == MBEDTLS_PK_NONE )
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{
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MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext"
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" unknown sig alg encoding %d", p[1] ) );
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continue;
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}
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/* Check if we support the hash the user proposes */
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md_cur = mbedtls_ssl_md_alg_from_hash( p[0] );
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if( md_cur == MBEDTLS_MD_NONE )
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{
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MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext:"
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" unknown hash alg encoding %d", p[0] ) );
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continue;
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}
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if( mbedtls_ssl_check_sig_hash( ssl, md_cur ) == 0 )
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{
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mbedtls_ssl_sig_hash_set_add( &ssl->handshake->hash_algs, sig_cur, md_cur );
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MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext:"
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" match sig %d and hash %d",
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sig_cur, md_cur ) );
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}
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else
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{
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MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext: "
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"hash alg %d not supported", md_cur ) );
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}
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}
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return( 0 );
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}
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#endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
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MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
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#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
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defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
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static int ssl_parse_supported_elliptic_curves( mbedtls_ssl_context *ssl,
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const unsigned char *buf,
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size_t len )
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{
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size_t list_size, our_size;
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const unsigned char *p;
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const mbedtls_ecp_curve_info *curve_info, **curves;
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if ( len < 2 ) {
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
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MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
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return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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list_size = ( ( buf[0] << 8 ) | ( buf[1] ) );
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if( list_size + 2 != len ||
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list_size % 2 != 0 )
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{
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
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MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
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return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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/* Should never happen unless client duplicates the extension */
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if( ssl->handshake->curves != NULL )
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{
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
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MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
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return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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/* Don't allow our peer to make us allocate too much memory,
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* and leave room for a final 0 */
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our_size = list_size / 2 + 1;
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if( our_size > MBEDTLS_ECP_DP_MAX )
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our_size = MBEDTLS_ECP_DP_MAX;
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if( ( curves = mbedtls_calloc( our_size, sizeof( *curves ) ) ) == NULL )
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{
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mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
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MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
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return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
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}
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ssl->handshake->curves = curves;
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p = buf + 2;
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while( list_size > 0 && our_size > 1 )
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{
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curve_info = mbedtls_ecp_curve_info_from_tls_id( ( p[0] << 8 ) | p[1] );
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if( curve_info != NULL )
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{
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*curves++ = curve_info;
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our_size--;
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}
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list_size -= 2;
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p += 2;
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}
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return( 0 );
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}
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static int ssl_parse_supported_point_formats( mbedtls_ssl_context *ssl,
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const unsigned char *buf,
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size_t len )
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{
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size_t list_size;
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const unsigned char *p;
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if( len == 0 || (size_t)( buf[0] + 1 ) != len )
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{
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
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MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
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return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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list_size = buf[0];
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p = buf + 1;
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while( list_size > 0 )
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{
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if( p[0] == MBEDTLS_ECP_PF_UNCOMPRESSED ||
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p[0] == MBEDTLS_ECP_PF_COMPRESSED )
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{
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#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C)
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ssl->handshake->ecdh_ctx.point_format = p[0];
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#endif
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#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
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ssl->handshake->ecjpake_ctx.point_format = p[0];
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#endif
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MBEDTLS_SSL_DEBUG_MSG( 4, ( "point format selected: %d", p[0] ) );
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return( 0 );
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}
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list_size--;
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p++;
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}
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return( 0 );
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}
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#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C ||
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MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
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#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
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static int ssl_parse_ecjpake_kkpp( mbedtls_ssl_context *ssl,
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const unsigned char *buf,
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size_t len )
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{
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int ret;
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if( mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 )
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{
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MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip ecjpake kkpp extension" ) );
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return( 0 );
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}
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if( ( ret = mbedtls_ecjpake_read_round_one( &ssl->handshake->ecjpake_ctx,
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buf, len ) ) != 0 )
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{
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MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_one", ret );
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mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
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MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
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return( ret );
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}
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/* Only mark the extension as OK when we're sure it is */
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ssl->handshake->cli_exts |= MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK;
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return( 0 );
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}
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#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
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#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
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static int ssl_parse_max_fragment_length_ext( mbedtls_ssl_context *ssl,
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const unsigned char *buf,
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size_t len )
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{
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if( len != 1 || buf[0] >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID )
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{
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
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MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
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return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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ssl->session_negotiate->mfl_code = buf[0];
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return( 0 );
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}
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#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
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#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
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static int ssl_parse_truncated_hmac_ext( mbedtls_ssl_context *ssl,
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const unsigned char *buf,
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size_t len )
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{
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if( len != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
((void) buf);
|
|
|
|
if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED )
|
|
ssl->session_negotiate->trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_ENABLED;
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
|
|
|
|
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
|
|
static int ssl_parse_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
|
|
const unsigned char *buf,
|
|
size_t len )
|
|
{
|
|
if( len != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
((void) buf);
|
|
|
|
if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED &&
|
|
ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 )
|
|
{
|
|
ssl->session_negotiate->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED;
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
|
|
|
|
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
|
|
static int ssl_parse_extended_ms_ext( mbedtls_ssl_context *ssl,
|
|
const unsigned char *buf,
|
|
size_t len )
|
|
{
|
|
if( len != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
((void) buf);
|
|
|
|
if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED &&
|
|
ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 )
|
|
{
|
|
ssl->handshake->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
|
|
|
|
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
|
|
static int ssl_parse_session_ticket_ext( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
size_t len )
|
|
{
|
|
int ret;
|
|
mbedtls_ssl_session session;
|
|
|
|
mbedtls_ssl_session_init( &session );
|
|
|
|
if( ssl->conf->f_ticket_parse == NULL ||
|
|
ssl->conf->f_ticket_write == NULL )
|
|
{
|
|
return( 0 );
|
|
}
|
|
|
|
/* Remember the client asked us to send a new ticket */
|
|
ssl->handshake->new_session_ticket = 1;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket length: %d", len ) );
|
|
|
|
if( len == 0 )
|
|
return( 0 );
|
|
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket rejected: renegotiating" ) );
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_SSL_RENEGOTIATION */
|
|
|
|
/*
|
|
* Failures are ok: just ignore the ticket and proceed.
|
|
*/
|
|
if( ( ret = ssl->conf->f_ticket_parse( ssl->conf->p_ticket, &session,
|
|
buf, len ) ) != 0 )
|
|
{
|
|
mbedtls_ssl_session_free( &session );
|
|
|
|
if( ret == MBEDTLS_ERR_SSL_INVALID_MAC )
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is not authentic" ) );
|
|
else if( ret == MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED )
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is expired" ) );
|
|
else
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_ticket_parse", ret );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Keep the session ID sent by the client, since we MUST send it back to
|
|
* inform them we're accepting the ticket (RFC 5077 section 3.4)
|
|
*/
|
|
session.id_len = ssl->session_negotiate->id_len;
|
|
memcpy( &session.id, ssl->session_negotiate->id, session.id_len );
|
|
|
|
mbedtls_ssl_session_free( ssl->session_negotiate );
|
|
memcpy( ssl->session_negotiate, &session, sizeof( mbedtls_ssl_session ) );
|
|
|
|
/* Zeroize instead of free as we copied the content */
|
|
mbedtls_zeroize( &session, sizeof( mbedtls_ssl_session ) );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "session successfully restored from ticket" ) );
|
|
|
|
ssl->handshake->resume = 1;
|
|
|
|
/* Don't send a new ticket after all, this one is OK */
|
|
ssl->handshake->new_session_ticket = 0;
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_SSL_SESSION_TICKETS */
|
|
|
|
#if defined(MBEDTLS_SSL_ALPN)
|
|
static int ssl_parse_alpn_ext( mbedtls_ssl_context *ssl,
|
|
const unsigned char *buf, size_t len )
|
|
{
|
|
size_t list_len, cur_len, ours_len;
|
|
const unsigned char *theirs, *start, *end;
|
|
const char **ours;
|
|
|
|
/* If ALPN not configured, just ignore the extension */
|
|
if( ssl->conf->alpn_list == NULL )
|
|
return( 0 );
|
|
|
|
/*
|
|
* opaque ProtocolName<1..2^8-1>;
|
|
*
|
|
* struct {
|
|
* ProtocolName protocol_name_list<2..2^16-1>
|
|
* } ProtocolNameList;
|
|
*/
|
|
|
|
/* Min length is 2 (list_len) + 1 (name_len) + 1 (name) */
|
|
if( len < 4 )
|
|
{
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
list_len = ( buf[0] << 8 ) | buf[1];
|
|
if( list_len != len - 2 )
|
|
{
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
/*
|
|
* Validate peer's list (lengths)
|
|
*/
|
|
start = buf + 2;
|
|
end = buf + len;
|
|
for( theirs = start; theirs != end; theirs += cur_len )
|
|
{
|
|
cur_len = *theirs++;
|
|
|
|
/* Current identifier must fit in list */
|
|
if( cur_len > (size_t)( end - theirs ) )
|
|
{
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
/* Empty strings MUST NOT be included */
|
|
if( cur_len == 0 )
|
|
{
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Use our order of preference
|
|
*/
|
|
for( ours = ssl->conf->alpn_list; *ours != NULL; ours++ )
|
|
{
|
|
ours_len = strlen( *ours );
|
|
for( theirs = start; theirs != end; theirs += cur_len )
|
|
{
|
|
cur_len = *theirs++;
|
|
|
|
if( cur_len == ours_len &&
|
|
memcmp( theirs, *ours, cur_len ) == 0 )
|
|
{
|
|
ssl->alpn_chosen = *ours;
|
|
return( 0 );
|
|
}
|
|
}
|
|
}
|
|
|
|
/* If we get there, no match was found */
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_NO_APPLICATION_PROTOCOL );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
#endif /* MBEDTLS_SSL_ALPN */
|
|
|
|
/*
|
|
* Auxiliary functions for ServerHello parsing and related actions
|
|
*/
|
|
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
|
/*
|
|
* Return 0 if the given key uses one of the acceptable curves, -1 otherwise
|
|
*/
|
|
#if defined(MBEDTLS_ECDSA_C)
|
|
static int ssl_check_key_curve( mbedtls_pk_context *pk,
|
|
const mbedtls_ecp_curve_info **curves )
|
|
{
|
|
const mbedtls_ecp_curve_info **crv = curves;
|
|
mbedtls_ecp_group_id grp_id = mbedtls_pk_ec( *pk )->grp.id;
|
|
|
|
while( *crv != NULL )
|
|
{
|
|
if( (*crv)->grp_id == grp_id )
|
|
return( 0 );
|
|
crv++;
|
|
}
|
|
|
|
return( -1 );
|
|
}
|
|
#endif /* MBEDTLS_ECDSA_C */
|
|
|
|
/*
|
|
* Try picking a certificate for this ciphersuite,
|
|
* return 0 on success and -1 on failure.
|
|
*/
|
|
static int ssl_pick_cert( mbedtls_ssl_context *ssl,
|
|
const mbedtls_ssl_ciphersuite_t * ciphersuite_info )
|
|
{
|
|
mbedtls_ssl_key_cert *cur, *list, *fallback = NULL;
|
|
mbedtls_pk_type_t pk_alg =
|
|
mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
|
|
uint32_t flags;
|
|
|
|
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
|
|
if( ssl->handshake->sni_key_cert != NULL )
|
|
list = ssl->handshake->sni_key_cert;
|
|
else
|
|
#endif
|
|
list = ssl->conf->key_cert;
|
|
|
|
if( pk_alg == MBEDTLS_PK_NONE )
|
|
return( 0 );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite requires certificate" ) );
|
|
|
|
if( list == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server has no certificate" ) );
|
|
return( -1 );
|
|
}
|
|
|
|
for( cur = list; cur != NULL; cur = cur->next )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_CRT( 3, "candidate certificate chain, certificate",
|
|
cur->cert );
|
|
|
|
if( ! mbedtls_pk_can_do( cur->key, pk_alg ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: key type" ) );
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* This avoids sending the client a cert it'll reject based on
|
|
* keyUsage or other extensions.
|
|
*
|
|
* It also allows the user to provision different certificates for
|
|
* different uses based on keyUsage, eg if they want to avoid signing
|
|
* and decrypting with the same RSA key.
|
|
*/
|
|
if( mbedtls_ssl_check_cert_usage( cur->cert, ciphersuite_info,
|
|
MBEDTLS_SSL_IS_SERVER, &flags ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: "
|
|
"(extended) key usage extension" ) );
|
|
continue;
|
|
}
|
|
|
|
#if defined(MBEDTLS_ECDSA_C)
|
|
if( pk_alg == MBEDTLS_PK_ECDSA &&
|
|
ssl_check_key_curve( cur->key, ssl->handshake->curves ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: elliptic curve" ) );
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Try to select a SHA-1 certificate for pre-1.2 clients, but still
|
|
* present them a SHA-higher cert rather than failing if it's the only
|
|
* one we got that satisfies the other conditions.
|
|
*/
|
|
if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 &&
|
|
cur->cert->sig_md != MBEDTLS_MD_SHA1 )
|
|
{
|
|
if( fallback == NULL )
|
|
fallback = cur;
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate not preferred: "
|
|
"sha-2 with pre-TLS 1.2 client" ) );
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* If we get there, we got a winner */
|
|
break;
|
|
}
|
|
|
|
if( cur == NULL )
|
|
cur = fallback;
|
|
|
|
/* Do not update ssl->handshake->key_cert unless there is a match */
|
|
if( cur != NULL )
|
|
{
|
|
ssl->handshake->key_cert = cur;
|
|
MBEDTLS_SSL_DEBUG_CRT( 3, "selected certificate chain, certificate",
|
|
ssl->handshake->key_cert->cert );
|
|
return( 0 );
|
|
}
|
|
|
|
return( -1 );
|
|
}
|
|
#endif /* MBEDTLS_X509_CRT_PARSE_C */
|
|
|
|
/*
|
|
* Check if a given ciphersuite is suitable for use with our config/keys/etc
|
|
* Sets ciphersuite_info only if the suite matches.
|
|
*/
|
|
static int ssl_ciphersuite_match( mbedtls_ssl_context *ssl, int suite_id,
|
|
const mbedtls_ssl_ciphersuite_t **ciphersuite_info )
|
|
{
|
|
const mbedtls_ssl_ciphersuite_t *suite_info;
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
|
|
defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
|
|
mbedtls_pk_type_t sig_type;
|
|
#endif
|
|
|
|
suite_info = mbedtls_ssl_ciphersuite_from_id( suite_id );
|
|
if( suite_info == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "trying ciphersuite: %s", suite_info->name ) );
|
|
|
|
if( suite_info->min_minor_ver > ssl->minor_ver ||
|
|
suite_info->max_minor_ver < ssl->minor_ver )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: version" ) );
|
|
return( 0 );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
|
|
( suite_info->flags & MBEDTLS_CIPHERSUITE_NODTLS ) )
|
|
return( 0 );
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_ARC4_C)
|
|
if( ssl->conf->arc4_disabled == MBEDTLS_SSL_ARC4_DISABLED &&
|
|
suite_info->cipher == MBEDTLS_CIPHER_ARC4_128 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: rc4" ) );
|
|
return( 0 );
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
|
|
if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE &&
|
|
( ssl->handshake->cli_exts & MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK ) == 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: ecjpake "
|
|
"not configured or ext missing" ) );
|
|
return( 0 );
|
|
}
|
|
#endif
|
|
|
|
|
|
#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C)
|
|
if( mbedtls_ssl_ciphersuite_uses_ec( suite_info ) &&
|
|
( ssl->handshake->curves == NULL ||
|
|
ssl->handshake->curves[0] == NULL ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: "
|
|
"no common elliptic curve" ) );
|
|
return( 0 );
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
|
|
/* If the ciphersuite requires a pre-shared key and we don't
|
|
* have one, skip it now rather than failing later */
|
|
if( mbedtls_ssl_ciphersuite_uses_psk( suite_info ) &&
|
|
ssl->conf->f_psk == NULL &&
|
|
( ssl->conf->psk == NULL || ssl->conf->psk_identity == NULL ||
|
|
ssl->conf->psk_identity_len == 0 || ssl->conf->psk_len == 0 ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no pre-shared key" ) );
|
|
return( 0 );
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
|
|
defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
|
|
/* If the ciphersuite requires signing, check whether
|
|
* a suitable hash algorithm is present. */
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
|
|
{
|
|
sig_type = mbedtls_ssl_get_ciphersuite_sig_alg( suite_info );
|
|
if( sig_type != MBEDTLS_PK_NONE &&
|
|
mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs, sig_type ) == MBEDTLS_MD_NONE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no suitable hash algorithm "
|
|
"for signature algorithm %d", sig_type ) );
|
|
return( 0 );
|
|
}
|
|
}
|
|
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
|
|
MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
|
|
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
|
/*
|
|
* Final check: if ciphersuite requires us to have a
|
|
* certificate/key of a particular type:
|
|
* - select the appropriate certificate if we have one, or
|
|
* - try the next ciphersuite if we don't
|
|
* This must be done last since we modify the key_cert list.
|
|
*/
|
|
if( ssl_pick_cert( ssl, suite_info ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: "
|
|
"no suitable certificate" ) );
|
|
return( 0 );
|
|
}
|
|
#endif
|
|
|
|
*ciphersuite_info = suite_info;
|
|
return( 0 );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO)
|
|
static int ssl_parse_client_hello_v2( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret, got_common_suite;
|
|
unsigned int i, j;
|
|
size_t n;
|
|
unsigned int ciph_len, sess_len, chal_len;
|
|
unsigned char *buf, *p;
|
|
const int *ciphersuites;
|
|
const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello v2" ) );
|
|
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "client hello v2 illegal for renegotiation" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
#endif /* MBEDTLS_SSL_RENEGOTIATION */
|
|
|
|
buf = ssl->in_hdr;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "record header", buf, 5 );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, message type: %d",
|
|
buf[2] ) );
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, message len.: %d",
|
|
( ( buf[0] & 0x7F ) << 8 ) | buf[1] ) );
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, max. version: [%d:%d]",
|
|
buf[3], buf[4] ) );
|
|
|
|
/*
|
|
* SSLv2 Client Hello
|
|
*
|
|
* Record layer:
|
|
* 0 . 1 message length
|
|
*
|
|
* SSL layer:
|
|
* 2 . 2 message type
|
|
* 3 . 4 protocol version
|
|
*/
|
|
if( buf[2] != MBEDTLS_SSL_HS_CLIENT_HELLO ||
|
|
buf[3] != MBEDTLS_SSL_MAJOR_VERSION_3 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
n = ( ( buf[0] << 8 ) | buf[1] ) & 0x7FFF;
|
|
|
|
if( n < 17 || n > 512 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
ssl->major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
|
|
ssl->minor_ver = ( buf[4] <= ssl->conf->max_minor_ver )
|
|
? buf[4] : ssl->conf->max_minor_ver;
|
|
|
|
if( ssl->minor_ver < ssl->conf->min_minor_ver )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "client only supports ssl smaller than minimum"
|
|
" [%d:%d] < [%d:%d]",
|
|
ssl->major_ver, ssl->minor_ver,
|
|
ssl->conf->min_major_ver, ssl->conf->min_minor_ver ) );
|
|
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
|
|
}
|
|
|
|
ssl->handshake->max_major_ver = buf[3];
|
|
ssl->handshake->max_minor_ver = buf[4];
|
|
|
|
if( ( ret = mbedtls_ssl_fetch_input( ssl, 2 + n ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
|
|
return( ret );
|
|
}
|
|
|
|
ssl->handshake->update_checksum( ssl, buf + 2, n );
|
|
|
|
buf = ssl->in_msg;
|
|
n = ssl->in_left - 5;
|
|
|
|
/*
|
|
* 0 . 1 ciphersuitelist length
|
|
* 2 . 3 session id length
|
|
* 4 . 5 challenge length
|
|
* 6 . .. ciphersuitelist
|
|
* .. . .. session id
|
|
* .. . .. challenge
|
|
*/
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "record contents", buf, n );
|
|
|
|
ciph_len = ( buf[0] << 8 ) | buf[1];
|
|
sess_len = ( buf[2] << 8 ) | buf[3];
|
|
chal_len = ( buf[4] << 8 ) | buf[5];
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciph_len: %d, sess_len: %d, chal_len: %d",
|
|
ciph_len, sess_len, chal_len ) );
|
|
|
|
/*
|
|
* Make sure each parameter length is valid
|
|
*/
|
|
if( ciph_len < 3 || ( ciph_len % 3 ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
if( sess_len > 32 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
if( chal_len < 8 || chal_len > 32 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
if( n != 6 + ciph_len + sess_len + chal_len )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist",
|
|
buf + 6, ciph_len );
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id",
|
|
buf + 6 + ciph_len, sess_len );
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, challenge",
|
|
buf + 6 + ciph_len + sess_len, chal_len );
|
|
|
|
p = buf + 6 + ciph_len;
|
|
ssl->session_negotiate->id_len = sess_len;
|
|
memset( ssl->session_negotiate->id, 0,
|
|
sizeof( ssl->session_negotiate->id ) );
|
|
memcpy( ssl->session_negotiate->id, p, ssl->session_negotiate->id_len );
|
|
|
|
p += sess_len;
|
|
memset( ssl->handshake->randbytes, 0, 64 );
|
|
memcpy( ssl->handshake->randbytes + 32 - chal_len, p, chal_len );
|
|
|
|
/*
|
|
* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV
|
|
*/
|
|
for( i = 0, p = buf + 6; i < ciph_len; i += 3, p += 3 )
|
|
{
|
|
if( p[0] == 0 && p[1] == 0 && p[2] == MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "received TLS_EMPTY_RENEGOTIATION_INFO " ) );
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "received RENEGOTIATION SCSV "
|
|
"during renegotiation" ) );
|
|
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
#endif /* MBEDTLS_SSL_RENEGOTIATION */
|
|
ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
|
|
break;
|
|
}
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_FALLBACK_SCSV)
|
|
for( i = 0, p = buf + 6; i < ciph_len; i += 3, p += 3 )
|
|
{
|
|
if( p[0] == 0 &&
|
|
p[1] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 ) & 0xff ) &&
|
|
p[2] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE ) & 0xff ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "received FALLBACK_SCSV" ) );
|
|
|
|
if( ssl->minor_ver < ssl->conf->max_minor_ver )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "inapropriate fallback" ) );
|
|
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_INAPROPRIATE_FALLBACK );
|
|
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_SSL_FALLBACK_SCSV */
|
|
|
|
got_common_suite = 0;
|
|
ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver];
|
|
ciphersuite_info = NULL;
|
|
#if defined(MBEDTLS_SSL_SRV_RESPECT_CLIENT_PREFERENCE)
|
|
for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 )
|
|
for( i = 0; ciphersuites[i] != 0; i++ )
|
|
#else
|
|
for( i = 0; ciphersuites[i] != 0; i++ )
|
|
for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 )
|
|
#endif
|
|
{
|
|
if( p[0] != 0 ||
|
|
p[1] != ( ( ciphersuites[i] >> 8 ) & 0xFF ) ||
|
|
p[2] != ( ( ciphersuites[i] ) & 0xFF ) )
|
|
continue;
|
|
|
|
got_common_suite = 1;
|
|
|
|
if( ( ret = ssl_ciphersuite_match( ssl, ciphersuites[i],
|
|
&ciphersuite_info ) ) != 0 )
|
|
return( ret );
|
|
|
|
if( ciphersuite_info != NULL )
|
|
goto have_ciphersuite_v2;
|
|
}
|
|
|
|
if( got_common_suite )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "got ciphersuites in common, "
|
|
"but none of them usable" ) );
|
|
return( MBEDTLS_ERR_SSL_NO_USABLE_CIPHERSUITE );
|
|
}
|
|
else
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) );
|
|
return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN );
|
|
}
|
|
|
|
have_ciphersuite_v2:
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s", ciphersuite_info->name ) );
|
|
|
|
ssl->session_negotiate->ciphersuite = ciphersuites[i];
|
|
ssl->transform_negotiate->ciphersuite_info = ciphersuite_info;
|
|
|
|
/*
|
|
* SSLv2 Client Hello relevant renegotiation security checks
|
|
*/
|
|
if( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
|
|
ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
ssl->in_left = 0;
|
|
ssl->state++;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello v2" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO */
|
|
|
|
/* This function doesn't alert on errors that happen early during
|
|
ClientHello parsing because they might indicate that the client is
|
|
not talking SSL/TLS at all and would not understand our alert. */
|
|
static int ssl_parse_client_hello( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret, got_common_suite;
|
|
size_t i, j;
|
|
size_t ciph_offset, comp_offset, ext_offset;
|
|
size_t msg_len, ciph_len, sess_len, comp_len, ext_len;
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
size_t cookie_offset, cookie_len;
|
|
#endif
|
|
unsigned char *buf, *p, *ext;
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
int renegotiation_info_seen = 0;
|
|
#endif
|
|
int handshake_failure = 0;
|
|
const int *ciphersuites;
|
|
const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
|
|
int major, minor;
|
|
|
|
/* If there is no signature-algorithm extension present,
|
|
* we need to fall back to the default values for allowed
|
|
* signature-hash pairs. */
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
|
|
defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
|
|
int sig_hash_alg_ext_present = 0;
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
|
|
MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello" ) );
|
|
|
|
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
|
|
read_record_header:
|
|
#endif
|
|
/*
|
|
* If renegotiating, then the input was read with mbedtls_ssl_read_record(),
|
|
* otherwise read it ourselves manually in order to support SSLv2
|
|
* ClientHello, which doesn't use the same record layer format.
|
|
*/
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE )
|
|
#endif
|
|
{
|
|
if( ( ret = mbedtls_ssl_fetch_input( ssl, 5 ) ) != 0 )
|
|
{
|
|
/* No alert on a read error. */
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
buf = ssl->in_hdr;
|
|
|
|
#if defined(MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO)
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_STREAM )
|
|
#endif
|
|
if( ( buf[0] & 0x80 ) != 0 )
|
|
return( ssl_parse_client_hello_v2( ssl ) );
|
|
#endif
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "record header", buf, mbedtls_ssl_hdr_len( ssl ) );
|
|
|
|
/*
|
|
* SSLv3/TLS Client Hello
|
|
*
|
|
* Record layer:
|
|
* 0 . 0 message type
|
|
* 1 . 2 protocol version
|
|
* 3 . 11 DTLS: epoch + record sequence number
|
|
* 3 . 4 message length
|
|
*/
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, message type: %d",
|
|
buf[0] ) );
|
|
|
|
if( buf[0] != MBEDTLS_SSL_MSG_HANDSHAKE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, message len.: %d",
|
|
( ssl->in_len[0] << 8 ) | ssl->in_len[1] ) );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, protocol version: [%d:%d]",
|
|
buf[1], buf[2] ) );
|
|
|
|
mbedtls_ssl_read_version( &major, &minor, ssl->conf->transport, buf + 1 );
|
|
|
|
/* According to RFC 5246 Appendix E.1, the version here is typically
|
|
* "{03,00}, the lowest version number supported by the client, [or] the
|
|
* value of ClientHello.client_version", so the only meaningful check here
|
|
* is the major version shouldn't be less than 3 */
|
|
if( major < MBEDTLS_SSL_MAJOR_VERSION_3 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
/* For DTLS if this is the initial handshake, remember the client sequence
|
|
* number to use it in our next message (RFC 6347 4.2.1) */
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
&& ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE
|
|
#endif
|
|
)
|
|
{
|
|
/* Epoch should be 0 for initial handshakes */
|
|
if( ssl->in_ctr[0] != 0 || ssl->in_ctr[1] != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
memcpy( ssl->out_ctr + 2, ssl->in_ctr + 2, 6 );
|
|
|
|
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
|
|
if( mbedtls_ssl_dtls_replay_check( ssl ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "replayed record, discarding" ) );
|
|
ssl->next_record_offset = 0;
|
|
ssl->in_left = 0;
|
|
goto read_record_header;
|
|
}
|
|
|
|
/* No MAC to check yet, so we can update right now */
|
|
mbedtls_ssl_dtls_replay_update( ssl );
|
|
#endif
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_DTLS */
|
|
|
|
msg_len = ( ssl->in_len[0] << 8 ) | ssl->in_len[1];
|
|
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
|
|
{
|
|
/* Set by mbedtls_ssl_read_record() */
|
|
msg_len = ssl->in_hslen;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
if( msg_len > MBEDTLS_SSL_MAX_CONTENT_LEN )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
if( ( ret = mbedtls_ssl_fetch_input( ssl,
|
|
mbedtls_ssl_hdr_len( ssl ) + msg_len ) ) != 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 = msg_len + mbedtls_ssl_hdr_len( ssl );
|
|
else
|
|
#endif
|
|
ssl->in_left = 0;
|
|
}
|
|
|
|
buf = ssl->in_msg;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "record contents", buf, msg_len );
|
|
|
|
ssl->handshake->update_checksum( ssl, buf, msg_len );
|
|
|
|
/*
|
|
* Handshake layer:
|
|
* 0 . 0 handshake type
|
|
* 1 . 3 handshake length
|
|
* 4 . 5 DTLS only: message seqence number
|
|
* 6 . 8 DTLS only: fragment offset
|
|
* 9 . 11 DTLS only: fragment length
|
|
*/
|
|
if( msg_len < mbedtls_ssl_hs_hdr_len( ssl ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, handshake type: %d", buf[0] ) );
|
|
|
|
if( buf[0] != MBEDTLS_SSL_HS_CLIENT_HELLO )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, handshake len.: %d",
|
|
( buf[1] << 16 ) | ( buf[2] << 8 ) | buf[3] ) );
|
|
|
|
/* We don't support fragmentation of ClientHello (yet?) */
|
|
if( buf[1] != 0 ||
|
|
msg_len != mbedtls_ssl_hs_hdr_len( ssl ) + ( ( buf[2] << 8 ) | buf[3] ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
{
|
|
/*
|
|
* Copy the client's handshake message_seq on initial handshakes,
|
|
* check sequence number on renego.
|
|
*/
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
|
|
{
|
|
/* This couldn't be done in ssl_prepare_handshake_record() */
|
|
unsigned int cli_msg_seq = ( ssl->in_msg[4] << 8 ) |
|
|
ssl->in_msg[5];
|
|
|
|
if( cli_msg_seq != ssl->handshake->in_msg_seq )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message_seq: "
|
|
"%d (expected %d)", cli_msg_seq,
|
|
ssl->handshake->in_msg_seq ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
ssl->handshake->in_msg_seq++;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
unsigned int cli_msg_seq = ( ssl->in_msg[4] << 8 ) |
|
|
ssl->in_msg[5];
|
|
ssl->handshake->out_msg_seq = cli_msg_seq;
|
|
ssl->handshake->in_msg_seq = cli_msg_seq + 1;
|
|
}
|
|
|
|
/*
|
|
* For now we don't support fragmentation, so make sure
|
|
* fragment_offset == 0 and fragment_length == length
|
|
*/
|
|
if( ssl->in_msg[6] != 0 || ssl->in_msg[7] != 0 || ssl->in_msg[8] != 0 ||
|
|
memcmp( ssl->in_msg + 1, ssl->in_msg + 9, 3 ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "ClientHello fragmentation not supported" ) );
|
|
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_DTLS */
|
|
|
|
buf += mbedtls_ssl_hs_hdr_len( ssl );
|
|
msg_len -= mbedtls_ssl_hs_hdr_len( ssl );
|
|
|
|
/*
|
|
* ClientHello layer:
|
|
* 0 . 1 protocol version
|
|
* 2 . 33 random bytes (starting with 4 bytes of Unix time)
|
|
* 34 . 35 session id length (1 byte)
|
|
* 35 . 34+x session id
|
|
* 35+x . 35+x DTLS only: cookie length (1 byte)
|
|
* 36+x . .. DTLS only: cookie
|
|
* .. . .. ciphersuite list length (2 bytes)
|
|
* .. . .. ciphersuite list
|
|
* .. . .. compression alg. list length (1 byte)
|
|
* .. . .. compression alg. list
|
|
* .. . .. extensions length (2 bytes, optional)
|
|
* .. . .. extensions (optional)
|
|
*/
|
|
|
|
/*
|
|
* Minimal length (with everything empty and extensions ommitted) is
|
|
* 2 + 32 + 1 + 2 + 1 = 38 bytes. Check that first, so that we can
|
|
* read at least up to session id length without worrying.
|
|
*/
|
|
if( msg_len < 38 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
/*
|
|
* Check and save the protocol version
|
|
*/
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, version", buf, 2 );
|
|
|
|
mbedtls_ssl_read_version( &ssl->major_ver, &ssl->minor_ver,
|
|
ssl->conf->transport, buf );
|
|
|
|
ssl->handshake->max_major_ver = ssl->major_ver;
|
|
ssl->handshake->max_minor_ver = ssl->minor_ver;
|
|
|
|
if( ssl->major_ver < ssl->conf->min_major_ver ||
|
|
ssl->minor_ver < ssl->conf->min_minor_ver )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "client only supports ssl smaller than minimum"
|
|
" [%d:%d] < [%d:%d]",
|
|
ssl->major_ver, ssl->minor_ver,
|
|
ssl->conf->min_major_ver, ssl->conf->min_minor_ver ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
|
|
}
|
|
|
|
if( ssl->major_ver > ssl->conf->max_major_ver )
|
|
{
|
|
ssl->major_ver = ssl->conf->max_major_ver;
|
|
ssl->minor_ver = ssl->conf->max_minor_ver;
|
|
}
|
|
else if( ssl->minor_ver > ssl->conf->max_minor_ver )
|
|
ssl->minor_ver = ssl->conf->max_minor_ver;
|
|
|
|
/*
|
|
* Save client random (inc. Unix time)
|
|
*/
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes", buf + 2, 32 );
|
|
|
|
memcpy( ssl->handshake->randbytes, buf + 2, 32 );
|
|
|
|
/*
|
|
* Check the session ID length and save session ID
|
|
*/
|
|
sess_len = buf[34];
|
|
|
|
if( sess_len > sizeof( ssl->session_negotiate->id ) ||
|
|
sess_len + 34 + 2 > msg_len ) /* 2 for cipherlist length field */
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", buf + 35, sess_len );
|
|
|
|
ssl->session_negotiate->id_len = sess_len;
|
|
memset( ssl->session_negotiate->id, 0,
|
|
sizeof( ssl->session_negotiate->id ) );
|
|
memcpy( ssl->session_negotiate->id, buf + 35,
|
|
ssl->session_negotiate->id_len );
|
|
|
|
/*
|
|
* Check the cookie length and content
|
|
*/
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
{
|
|
cookie_offset = 35 + sess_len;
|
|
cookie_len = buf[cookie_offset];
|
|
|
|
if( cookie_offset + 1 + cookie_len + 2 > msg_len )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, cookie",
|
|
buf + cookie_offset + 1, cookie_len );
|
|
|
|
#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
|
|
if( ssl->conf->f_cookie_check != NULL
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
&& ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE
|
|
#endif
|
|
)
|
|
{
|
|
if( ssl->conf->f_cookie_check( ssl->conf->p_cookie,
|
|
buf + cookie_offset + 1, cookie_len,
|
|
ssl->cli_id, ssl->cli_id_len ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification failed" ) );
|
|
ssl->handshake->verify_cookie_len = 1;
|
|
}
|
|
else
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification passed" ) );
|
|
ssl->handshake->verify_cookie_len = 0;
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
|
|
{
|
|
/* We know we didn't send a cookie, so it should be empty */
|
|
if( cookie_len != 0 )
|
|
{
|
|
/* This may be an attacker's probe, so don't send an alert */
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification skipped" ) );
|
|
}
|
|
|
|
/*
|
|
* Check the ciphersuitelist length (will be parsed later)
|
|
*/
|
|
ciph_offset = cookie_offset + 1 + cookie_len;
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_PROTO_DTLS */
|
|
ciph_offset = 35 + sess_len;
|
|
|
|
ciph_len = ( buf[ciph_offset + 0] << 8 )
|
|
| ( buf[ciph_offset + 1] );
|
|
|
|
if( ciph_len < 2 ||
|
|
ciph_len + 2 + ciph_offset + 1 > msg_len || /* 1 for comp. alg. len */
|
|
( ciph_len % 2 ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist",
|
|
buf + ciph_offset + 2, ciph_len );
|
|
|
|
/*
|
|
* Check the compression algorithms length and pick one
|
|
*/
|
|
comp_offset = ciph_offset + 2 + ciph_len;
|
|
|
|
comp_len = buf[comp_offset];
|
|
|
|
if( comp_len < 1 ||
|
|
comp_len > 16 ||
|
|
comp_len + comp_offset + 1 > msg_len )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, compression",
|
|
buf + comp_offset + 1, comp_len );
|
|
|
|
ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL;
|
|
#if defined(MBEDTLS_ZLIB_SUPPORT)
|
|
for( i = 0; i < comp_len; ++i )
|
|
{
|
|
if( buf[comp_offset + 1 + i] == MBEDTLS_SSL_COMPRESS_DEFLATE )
|
|
{
|
|
ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_DEFLATE;
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* See comments in ssl_write_client_hello() */
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL;
|
|
#endif
|
|
|
|
/* Do not parse the extensions if the protocol is SSLv3 */
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
if( ( ssl->major_ver != 3 ) || ( ssl->minor_ver != 0 ) )
|
|
{
|
|
#endif
|
|
/*
|
|
* Check the extension length
|
|
*/
|
|
ext_offset = comp_offset + 1 + comp_len;
|
|
if( msg_len > ext_offset )
|
|
{
|
|
if( msg_len < ext_offset + 2 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
ext_len = ( buf[ext_offset + 0] << 8 )
|
|
| ( buf[ext_offset + 1] );
|
|
|
|
if( ( ext_len > 0 && ext_len < 4 ) ||
|
|
msg_len != ext_offset + 2 + ext_len )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
}
|
|
else
|
|
ext_len = 0;
|
|
|
|
ext = buf + ext_offset + 2;
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello extensions", ext, ext_len );
|
|
|
|
while( ext_len != 0 )
|
|
{
|
|
unsigned int ext_id;
|
|
unsigned int ext_size;
|
|
if ( ext_len < 4 ) {
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
ext_id = ( ( ext[0] << 8 ) | ( ext[1] ) );
|
|
ext_size = ( ( ext[2] << 8 ) | ( ext[3] ) );
|
|
|
|
if( ext_size + 4 > ext_len )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
switch( ext_id )
|
|
{
|
|
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
|
|
case MBEDTLS_TLS_EXT_SERVERNAME:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ServerName extension" ) );
|
|
if( ssl->conf->f_sni == NULL )
|
|
break;
|
|
|
|
ret = ssl_parse_servername_ext( ssl, ext + 4, ext_size );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
break;
|
|
#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
|
|
|
|
case MBEDTLS_TLS_EXT_RENEGOTIATION_INFO:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found renegotiation extension" ) );
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
renegotiation_info_seen = 1;
|
|
#endif
|
|
|
|
ret = ssl_parse_renegotiation_info( ssl, ext + 4, ext_size );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
break;
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
|
|
defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
|
|
case MBEDTLS_TLS_EXT_SIG_ALG:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found signature_algorithms extension" ) );
|
|
|
|
ret = ssl_parse_signature_algorithms_ext( ssl, ext + 4, ext_size );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
sig_hash_alg_ext_present = 1;
|
|
break;
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
|
|
MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
|
|
|
|
#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
|
|
defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
|
|
case MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported elliptic curves extension" ) );
|
|
|
|
ret = ssl_parse_supported_elliptic_curves( ssl, ext + 4, ext_size );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
break;
|
|
|
|
case MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported point formats extension" ) );
|
|
ssl->handshake->cli_exts |= MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT;
|
|
|
|
ret = ssl_parse_supported_point_formats( ssl, ext + 4, ext_size );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
break;
|
|
#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C ||
|
|
MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
|
|
case MBEDTLS_TLS_EXT_ECJPAKE_KKPP:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ecjpake kkpp extension" ) );
|
|
|
|
ret = ssl_parse_ecjpake_kkpp( ssl, ext + 4, ext_size );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
break;
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
|
|
|
|
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
|
|
case MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found max fragment length extension" ) );
|
|
|
|
ret = ssl_parse_max_fragment_length_ext( ssl, ext + 4, ext_size );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
break;
|
|
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
|
|
|
|
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
|
|
case MBEDTLS_TLS_EXT_TRUNCATED_HMAC:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found truncated hmac extension" ) );
|
|
|
|
ret = ssl_parse_truncated_hmac_ext( ssl, ext + 4, ext_size );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
break;
|
|
#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
|
|
|
|
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
|
|
case MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found encrypt then mac extension" ) );
|
|
|
|
ret = ssl_parse_encrypt_then_mac_ext( ssl, ext + 4, ext_size );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
break;
|
|
#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
|
|
|
|
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
|
|
case MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found extended master secret extension" ) );
|
|
|
|
ret = ssl_parse_extended_ms_ext( ssl, ext + 4, ext_size );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
break;
|
|
#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
|
|
|
|
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
|
|
case MBEDTLS_TLS_EXT_SESSION_TICKET:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found session ticket extension" ) );
|
|
|
|
ret = ssl_parse_session_ticket_ext( ssl, ext + 4, ext_size );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
break;
|
|
#endif /* MBEDTLS_SSL_SESSION_TICKETS */
|
|
|
|
#if defined(MBEDTLS_SSL_ALPN)
|
|
case MBEDTLS_TLS_EXT_ALPN:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found alpn extension" ) );
|
|
|
|
ret = ssl_parse_alpn_ext( ssl, ext + 4, ext_size );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
break;
|
|
#endif /* MBEDTLS_SSL_SESSION_TICKETS */
|
|
|
|
default:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "unknown extension found: %d (ignoring)",
|
|
ext_id ) );
|
|
}
|
|
|
|
ext_len -= 4 + ext_size;
|
|
ext += 4 + ext_size;
|
|
|
|
if( ext_len > 0 && ext_len < 4 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
}
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_FALLBACK_SCSV)
|
|
for( i = 0, p = buf + ciph_offset + 2; i < ciph_len; i += 2, p += 2 )
|
|
{
|
|
if( p[0] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 ) & 0xff ) &&
|
|
p[1] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE ) & 0xff ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "received FALLBACK_SCSV" ) );
|
|
|
|
if( ssl->minor_ver < ssl->conf->max_minor_ver )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "inapropriate fallback" ) );
|
|
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_INAPROPRIATE_FALLBACK );
|
|
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_SSL_FALLBACK_SCSV */
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
|
|
defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
|
|
|
|
/*
|
|
* Try to fall back to default hash SHA1 if the client
|
|
* hasn't provided any preferred signature-hash combinations.
|
|
*/
|
|
if( sig_hash_alg_ext_present == 0 )
|
|
{
|
|
mbedtls_md_type_t md_default = MBEDTLS_MD_SHA1;
|
|
|
|
if( mbedtls_ssl_check_sig_hash( ssl, md_default ) != 0 )
|
|
md_default = MBEDTLS_MD_NONE;
|
|
|
|
mbedtls_ssl_sig_hash_set_const_hash( &ssl->handshake->hash_algs, md_default );
|
|
}
|
|
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
|
|
MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
|
|
|
|
/*
|
|
* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV
|
|
*/
|
|
for( i = 0, p = buf + ciph_offset + 2; i < ciph_len; i += 2, p += 2 )
|
|
{
|
|
if( p[0] == 0 && p[1] == MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "received TLS_EMPTY_RENEGOTIATION_INFO " ) );
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "received RENEGOTIATION SCSV "
|
|
"during renegotiation" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
#endif
|
|
ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Renegotiation security checks
|
|
*/
|
|
if( ssl->secure_renegotiation != MBEDTLS_SSL_SECURE_RENEGOTIATION &&
|
|
ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) );
|
|
handshake_failure = 1;
|
|
}
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
|
|
ssl->secure_renegotiation == MBEDTLS_SSL_SECURE_RENEGOTIATION &&
|
|
renegotiation_info_seen == 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension missing (secure)" ) );
|
|
handshake_failure = 1;
|
|
}
|
|
else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
|
|
ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
|
|
ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation not allowed" ) );
|
|
handshake_failure = 1;
|
|
}
|
|
else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
|
|
ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
|
|
renegotiation_info_seen == 1 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension present (legacy)" ) );
|
|
handshake_failure = 1;
|
|
}
|
|
#endif /* MBEDTLS_SSL_RENEGOTIATION */
|
|
|
|
if( handshake_failure == 1 )
|
|
{
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
|
|
}
|
|
|
|
/*
|
|
* Search for a matching ciphersuite
|
|
* (At the end because we need information from the EC-based extensions
|
|
* and certificate from the SNI callback triggered by the SNI extension.)
|
|
*/
|
|
got_common_suite = 0;
|
|
ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver];
|
|
ciphersuite_info = NULL;
|
|
#if defined(MBEDTLS_SSL_SRV_RESPECT_CLIENT_PREFERENCE)
|
|
for( j = 0, p = buf + ciph_offset + 2; j < ciph_len; j += 2, p += 2 )
|
|
for( i = 0; ciphersuites[i] != 0; i++ )
|
|
#else
|
|
for( i = 0; ciphersuites[i] != 0; i++ )
|
|
for( j = 0, p = buf + ciph_offset + 2; j < ciph_len; j += 2, p += 2 )
|
|
#endif
|
|
{
|
|
if( p[0] != ( ( ciphersuites[i] >> 8 ) & 0xFF ) ||
|
|
p[1] != ( ( ciphersuites[i] ) & 0xFF ) )
|
|
continue;
|
|
|
|
got_common_suite = 1;
|
|
|
|
if( ( ret = ssl_ciphersuite_match( ssl, ciphersuites[i],
|
|
&ciphersuite_info ) ) != 0 )
|
|
return( ret );
|
|
|
|
if( ciphersuite_info != NULL )
|
|
goto have_ciphersuite;
|
|
}
|
|
|
|
if( got_common_suite )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "got ciphersuites in common, "
|
|
"but none of them usable" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
|
|
return( MBEDTLS_ERR_SSL_NO_USABLE_CIPHERSUITE );
|
|
}
|
|
else
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
|
|
return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN );
|
|
}
|
|
|
|
have_ciphersuite:
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s", ciphersuite_info->name ) );
|
|
|
|
ssl->session_negotiate->ciphersuite = ciphersuites[i];
|
|
ssl->transform_negotiate->ciphersuite_info = ciphersuite_info;
|
|
|
|
ssl->state++;
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
|
mbedtls_ssl_recv_flight_completed( ssl );
|
|
#endif
|
|
|
|
/* Debugging-only output for testsuite */
|
|
#if defined(MBEDTLS_DEBUG_C) && \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
|
|
defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
|
|
{
|
|
mbedtls_pk_type_t sig_alg = mbedtls_ssl_get_ciphersuite_sig_alg( ciphersuite_info );
|
|
if( sig_alg != MBEDTLS_PK_NONE )
|
|
{
|
|
mbedtls_md_type_t md_alg = mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs,
|
|
sig_alg );
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext: %d",
|
|
mbedtls_ssl_hash_from_md_alg( md_alg ) ) );
|
|
}
|
|
else
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "no hash algorithm for signature algorithm "
|
|
"%d - should not happen", sig_alg ) );
|
|
}
|
|
}
|
|
#endif
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
|
|
static void ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
size_t *olen )
|
|
{
|
|
unsigned char *p = buf;
|
|
|
|
if( ssl->session_negotiate->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED )
|
|
{
|
|
*olen = 0;
|
|
return;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding truncated hmac extension" ) );
|
|
|
|
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC >> 8 ) & 0xFF );
|
|
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC ) & 0xFF );
|
|
|
|
*p++ = 0x00;
|
|
*p++ = 0x00;
|
|
|
|
*olen = 4;
|
|
}
|
|
#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
|
|
|
|
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
|
|
static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
size_t *olen )
|
|
{
|
|
unsigned char *p = buf;
|
|
const mbedtls_ssl_ciphersuite_t *suite = NULL;
|
|
const mbedtls_cipher_info_t *cipher = NULL;
|
|
|
|
if( ssl->session_negotiate->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED ||
|
|
ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
|
|
{
|
|
*olen = 0;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* RFC 7366: "If a server receives an encrypt-then-MAC request extension
|
|
* from a client and then selects a stream or Authenticated Encryption
|
|
* with Associated Data (AEAD) ciphersuite, it MUST NOT send an
|
|
* encrypt-then-MAC response extension back to the client."
|
|
*/
|
|
if( ( suite = mbedtls_ssl_ciphersuite_from_id(
|
|
ssl->session_negotiate->ciphersuite ) ) == NULL ||
|
|
( cipher = mbedtls_cipher_info_from_type( suite->cipher ) ) == NULL ||
|
|
cipher->mode != MBEDTLS_MODE_CBC )
|
|
{
|
|
*olen = 0;
|
|
return;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding encrypt then mac extension" ) );
|
|
|
|
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC >> 8 ) & 0xFF );
|
|
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC ) & 0xFF );
|
|
|
|
*p++ = 0x00;
|
|
*p++ = 0x00;
|
|
|
|
*olen = 4;
|
|
}
|
|
#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
|
|
|
|
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
|
|
static void ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
size_t *olen )
|
|
{
|
|
unsigned char *p = buf;
|
|
|
|
if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED ||
|
|
ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
|
|
{
|
|
*olen = 0;
|
|
return;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding extended master secret "
|
|
"extension" ) );
|
|
|
|
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET >> 8 ) & 0xFF );
|
|
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET ) & 0xFF );
|
|
|
|
*p++ = 0x00;
|
|
*p++ = 0x00;
|
|
|
|
*olen = 4;
|
|
}
|
|
#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
|
|
|
|
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
|
|
static void ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
size_t *olen )
|
|
{
|
|
unsigned char *p = buf;
|
|
|
|
if( ssl->handshake->new_session_ticket == 0 )
|
|
{
|
|
*olen = 0;
|
|
return;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding session ticket extension" ) );
|
|
|
|
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET >> 8 ) & 0xFF );
|
|
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET ) & 0xFF );
|
|
|
|
*p++ = 0x00;
|
|
*p++ = 0x00;
|
|
|
|
*olen = 4;
|
|
}
|
|
#endif /* MBEDTLS_SSL_SESSION_TICKETS */
|
|
|
|
static void ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
size_t *olen )
|
|
{
|
|
unsigned char *p = buf;
|
|
|
|
if( ssl->secure_renegotiation != MBEDTLS_SSL_SECURE_RENEGOTIATION )
|
|
{
|
|
*olen = 0;
|
|
return;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, secure renegotiation extension" ) );
|
|
|
|
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO >> 8 ) & 0xFF );
|
|
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO ) & 0xFF );
|
|
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
|
|
{
|
|
*p++ = 0x00;
|
|
*p++ = ( ssl->verify_data_len * 2 + 1 ) & 0xFF;
|
|
*p++ = ssl->verify_data_len * 2 & 0xFF;
|
|
|
|
memcpy( p, ssl->peer_verify_data, ssl->verify_data_len );
|
|
p += ssl->verify_data_len;
|
|
memcpy( p, ssl->own_verify_data, ssl->verify_data_len );
|
|
p += ssl->verify_data_len;
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_RENEGOTIATION */
|
|
{
|
|
*p++ = 0x00;
|
|
*p++ = 0x01;
|
|
*p++ = 0x00;
|
|
}
|
|
|
|
*olen = p - buf;
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
|
|
static void ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
size_t *olen )
|
|
{
|
|
unsigned char *p = buf;
|
|
|
|
if( ssl->session_negotiate->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE )
|
|
{
|
|
*olen = 0;
|
|
return;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, max_fragment_length extension" ) );
|
|
|
|
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH >> 8 ) & 0xFF );
|
|
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH ) & 0xFF );
|
|
|
|
*p++ = 0x00;
|
|
*p++ = 1;
|
|
|
|
*p++ = ssl->session_negotiate->mfl_code;
|
|
|
|
*olen = 5;
|
|
}
|
|
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
|
|
|
|
#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
|
|
defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
|
|
static void ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
size_t *olen )
|
|
{
|
|
unsigned char *p = buf;
|
|
((void) ssl);
|
|
|
|
if( ( ssl->handshake->cli_exts &
|
|
MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT ) == 0 )
|
|
{
|
|
*olen = 0;
|
|
return;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, supported_point_formats extension" ) );
|
|
|
|
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS >> 8 ) & 0xFF );
|
|
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS ) & 0xFF );
|
|
|
|
*p++ = 0x00;
|
|
*p++ = 2;
|
|
|
|
*p++ = 1;
|
|
*p++ = MBEDTLS_ECP_PF_UNCOMPRESSED;
|
|
|
|
*olen = 6;
|
|
}
|
|
#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
|
|
static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
size_t *olen )
|
|
{
|
|
int ret;
|
|
unsigned char *p = buf;
|
|
const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
|
|
size_t kkpp_len;
|
|
|
|
*olen = 0;
|
|
|
|
/* Skip costly computation if not needed */
|
|
if( ssl->transform_negotiate->ciphersuite_info->key_exchange !=
|
|
MBEDTLS_KEY_EXCHANGE_ECJPAKE )
|
|
return;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, ecjpake kkpp extension" ) );
|
|
|
|
if( end - p < 4 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
|
|
return;
|
|
}
|
|
|
|
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP >> 8 ) & 0xFF );
|
|
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP ) & 0xFF );
|
|
|
|
ret = mbedtls_ecjpake_write_round_one( &ssl->handshake->ecjpake_ctx,
|
|
p + 2, end - p - 2, &kkpp_len,
|
|
ssl->conf->f_rng, ssl->conf->p_rng );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1 , "mbedtls_ecjpake_write_round_one", ret );
|
|
return;
|
|
}
|
|
|
|
*p++ = (unsigned char)( ( kkpp_len >> 8 ) & 0xFF );
|
|
*p++ = (unsigned char)( ( kkpp_len ) & 0xFF );
|
|
|
|
*olen = kkpp_len + 4;
|
|
}
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
|
|
|
|
#if defined(MBEDTLS_SSL_ALPN )
|
|
static void ssl_write_alpn_ext( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf, size_t *olen )
|
|
{
|
|
if( ssl->alpn_chosen == NULL )
|
|
{
|
|
*olen = 0;
|
|
return;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding alpn extension" ) );
|
|
|
|
/*
|
|
* 0 . 1 ext identifier
|
|
* 2 . 3 ext length
|
|
* 4 . 5 protocol list length
|
|
* 6 . 6 protocol name length
|
|
* 7 . 7+n protocol name
|
|
*/
|
|
buf[0] = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN >> 8 ) & 0xFF );
|
|
buf[1] = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN ) & 0xFF );
|
|
|
|
*olen = 7 + strlen( ssl->alpn_chosen );
|
|
|
|
buf[2] = (unsigned char)( ( ( *olen - 4 ) >> 8 ) & 0xFF );
|
|
buf[3] = (unsigned char)( ( ( *olen - 4 ) ) & 0xFF );
|
|
|
|
buf[4] = (unsigned char)( ( ( *olen - 6 ) >> 8 ) & 0xFF );
|
|
buf[5] = (unsigned char)( ( ( *olen - 6 ) ) & 0xFF );
|
|
|
|
buf[6] = (unsigned char)( ( ( *olen - 7 ) ) & 0xFF );
|
|
|
|
memcpy( buf + 7, ssl->alpn_chosen, *olen - 7 );
|
|
}
|
|
#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C */
|
|
|
|
#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
|
|
static int ssl_write_hello_verify_request( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
unsigned char *p = ssl->out_msg + 4;
|
|
unsigned char *cookie_len_byte;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello verify request" ) );
|
|
|
|
/*
|
|
* struct {
|
|
* ProtocolVersion server_version;
|
|
* opaque cookie<0..2^8-1>;
|
|
* } HelloVerifyRequest;
|
|
*/
|
|
|
|
/* The RFC is not clear on this point, but sending the actual negotiated
|
|
* version looks like the most interoperable thing to do. */
|
|
mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
|
|
ssl->conf->transport, p );
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "server version", p, 2 );
|
|
p += 2;
|
|
|
|
/* If we get here, f_cookie_check is not null */
|
|
if( ssl->conf->f_cookie_write == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "inconsistent cookie callbacks" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
/* Skip length byte until we know the length */
|
|
cookie_len_byte = p++;
|
|
|
|
if( ( ret = ssl->conf->f_cookie_write( ssl->conf->p_cookie,
|
|
&p, ssl->out_buf + MBEDTLS_SSL_BUFFER_LEN,
|
|
ssl->cli_id, ssl->cli_id_len ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "f_cookie_write", ret );
|
|
return( ret );
|
|
}
|
|
|
|
*cookie_len_byte = (unsigned char)( p - ( cookie_len_byte + 1 ) );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "cookie sent", cookie_len_byte + 1, *cookie_len_byte );
|
|
|
|
ssl->out_msglen = p - ssl->out_msg;
|
|
ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
|
|
ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST;
|
|
|
|
ssl->state = MBEDTLS_SSL_SERVER_HELLO_VERIFY_REQUEST_SENT;
|
|
|
|
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 verify request" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
|
|
|
|
static int ssl_write_server_hello( mbedtls_ssl_context *ssl )
|
|
{
|
|
#if defined(MBEDTLS_HAVE_TIME)
|
|
mbedtls_time_t t;
|
|
#endif
|
|
int ret;
|
|
size_t olen, ext_len = 0, n;
|
|
unsigned char *buf, *p;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server hello" ) );
|
|
|
|
#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
|
|
ssl->handshake->verify_cookie_len != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "client hello was not authenticated" ) );
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello" ) );
|
|
|
|
return( ssl_write_hello_verify_request( ssl ) );
|
|
}
|
|
#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
|
|
|
|
if( ssl->conf->f_rng == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "no RNG provided") );
|
|
return( MBEDTLS_ERR_SSL_NO_RNG );
|
|
}
|
|
|
|
/*
|
|
* 0 . 0 handshake type
|
|
* 1 . 3 handshake length
|
|
* 4 . 5 protocol version
|
|
* 6 . 9 UNIX time()
|
|
* 10 . 37 random bytes
|
|
*/
|
|
buf = ssl->out_msg;
|
|
p = buf + 4;
|
|
|
|
mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
|
|
ssl->conf->transport, p );
|
|
p += 2;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen version: [%d:%d]",
|
|
buf[4], buf[5] ) );
|
|
|
|
#if defined(MBEDTLS_HAVE_TIME)
|
|
t = mbedtls_time( NULL );
|
|
*p++ = (unsigned char)( t >> 24 );
|
|
*p++ = (unsigned char)( t >> 16 );
|
|
*p++ = (unsigned char)( t >> 8 );
|
|
*p++ = (unsigned char)( t );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", t ) );
|
|
#else
|
|
if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 4 ) ) != 0 )
|
|
return( ret );
|
|
|
|
p += 4;
|
|
#endif /* MBEDTLS_HAVE_TIME */
|
|
|
|
if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 28 ) ) != 0 )
|
|
return( ret );
|
|
|
|
p += 28;
|
|
|
|
memcpy( ssl->handshake->randbytes + 32, buf + 6, 32 );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 6, 32 );
|
|
|
|
/*
|
|
* Resume is 0 by default, see ssl_handshake_init().
|
|
* It may be already set to 1 by ssl_parse_session_ticket_ext().
|
|
* If not, try looking up session ID in our cache.
|
|
*/
|
|
if( ssl->handshake->resume == 0 &&
|
|
#if defined(MBEDTLS_SSL_RENEGOTIATION)
|
|
ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE &&
|
|
#endif
|
|
ssl->session_negotiate->id_len != 0 &&
|
|
ssl->conf->f_get_cache != NULL &&
|
|
ssl->conf->f_get_cache( ssl->conf->p_cache, ssl->session_negotiate ) == 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "session successfully restored from cache" ) );
|
|
ssl->handshake->resume = 1;
|
|
}
|
|
|
|
if( ssl->handshake->resume == 0 )
|
|
{
|
|
/*
|
|
* New session, create a new session id,
|
|
* unless we're about to issue a session ticket
|
|
*/
|
|
ssl->state++;
|
|
|
|
#if defined(MBEDTLS_HAVE_TIME)
|
|
ssl->session_negotiate->start = mbedtls_time( NULL );
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
|
|
if( ssl->handshake->new_session_ticket != 0 )
|
|
{
|
|
ssl->session_negotiate->id_len = n = 0;
|
|
memset( ssl->session_negotiate->id, 0, 32 );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_SESSION_TICKETS */
|
|
{
|
|
ssl->session_negotiate->id_len = n = 32;
|
|
if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->session_negotiate->id,
|
|
n ) ) != 0 )
|
|
return( ret );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* Resuming a session
|
|
*/
|
|
n = ssl->session_negotiate->id_len;
|
|
ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC;
|
|
|
|
if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 38 . 38 session id length
|
|
* 39 . 38+n session id
|
|
* 39+n . 40+n chosen ciphersuite
|
|
* 41+n . 41+n chosen compression alg.
|
|
* 42+n . 43+n extensions length
|
|
* 44+n . 43+n+m extensions
|
|
*/
|
|
*p++ = (unsigned char) ssl->session_negotiate->id_len;
|
|
memcpy( p, ssl->session_negotiate->id, ssl->session_negotiate->id_len );
|
|
p += ssl->session_negotiate->id_len;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) );
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, session id", buf + 39, n );
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "%s session has been resumed",
|
|
ssl->handshake->resume ? "a" : "no" ) );
|
|
|
|
*p++ = (unsigned char)( ssl->session_negotiate->ciphersuite >> 8 );
|
|
*p++ = (unsigned char)( ssl->session_negotiate->ciphersuite );
|
|
*p++ = (unsigned char)( ssl->session_negotiate->compression );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %s",
|
|
mbedtls_ssl_get_ciphersuite_name( ssl->session_negotiate->ciphersuite ) ) );
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: 0x%02X",
|
|
ssl->session_negotiate->compression ) );
|
|
|
|
/* Do not write the extensions if the protocol is SSLv3 */
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
if( ( ssl->major_ver != 3 ) || ( ssl->minor_ver != 0 ) )
|
|
{
|
|
#endif
|
|
|
|
/*
|
|
* First write extensions, then the total length
|
|
*/
|
|
ssl_write_renegotiation_ext( ssl, p + 2 + ext_len, &olen );
|
|
ext_len += olen;
|
|
|
|
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
|
|
ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len, &olen );
|
|
ext_len += olen;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
|
|
ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len, &olen );
|
|
ext_len += olen;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
|
|
ssl_write_encrypt_then_mac_ext( ssl, p + 2 + ext_len, &olen );
|
|
ext_len += olen;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
|
|
ssl_write_extended_ms_ext( ssl, p + 2 + ext_len, &olen );
|
|
ext_len += olen;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
|
|
ssl_write_session_ticket_ext( ssl, p + 2 + ext_len, &olen );
|
|
ext_len += olen;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
|
|
defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
|
|
if ( mbedtls_ssl_ciphersuite_uses_ec(
|
|
mbedtls_ssl_ciphersuite_from_id( ssl->session_negotiate->ciphersuite ) ) )
|
|
{
|
|
ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len, &olen );
|
|
ext_len += olen;
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
|
|
ssl_write_ecjpake_kkpp_ext( ssl, p + 2 + ext_len, &olen );
|
|
ext_len += olen;
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SSL_ALPN)
|
|
ssl_write_alpn_ext( ssl, p + 2 + ext_len, &olen );
|
|
ext_len += olen;
|
|
#endif
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, total extension length: %d", ext_len ) );
|
|
|
|
if( ext_len > 0 )
|
|
{
|
|
*p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );
|
|
*p++ = (unsigned char)( ( ext_len ) & 0xFF );
|
|
p += ext_len;
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3)
|
|
}
|
|
#endif
|
|
|
|
ssl->out_msglen = p - buf;
|
|
ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
|
|
ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_HELLO;
|
|
|
|
ret = mbedtls_ssl_write_record( ssl );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello" ) );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
#if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \
|
|
!defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
|
|
!defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \
|
|
!defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \
|
|
!defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)&& \
|
|
!defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
|
|
static int ssl_write_certificate_request( mbedtls_ssl_context *ssl )
|
|
{
|
|
const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
|
|
ssl->transform_negotiate->ciphersuite_info;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) );
|
|
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_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 request" ) );
|
|
ssl->state++;
|
|
return( 0 );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
#else
|
|
static int ssl_write_certificate_request( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
|
|
const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
|
|
ssl->transform_negotiate->ciphersuite_info;
|
|
size_t dn_size, total_dn_size; /* excluding length bytes */
|
|
size_t ct_len, sa_len; /* including length bytes */
|
|
unsigned char *buf, *p;
|
|
const unsigned char * const end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
|
|
const mbedtls_x509_crt *crt;
|
|
int authmode;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) );
|
|
|
|
ssl->state++;
|
|
|
|
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
|
|
if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET )
|
|
authmode = ssl->handshake->sni_authmode;
|
|
else
|
|
#endif
|
|
authmode = ssl->conf->authmode;
|
|
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_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 ||
|
|
authmode == MBEDTLS_SSL_VERIFY_NONE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) );
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* 0 . 0 handshake type
|
|
* 1 . 3 handshake length
|
|
* 4 . 4 cert type count
|
|
* 5 .. m-1 cert types
|
|
* m .. m+1 sig alg length (TLS 1.2 only)
|
|
* m+1 .. n-1 SignatureAndHashAlgorithms (TLS 1.2 only)
|
|
* n .. n+1 length of all DNs
|
|
* n+2 .. n+3 length of DN 1
|
|
* n+4 .. ... Distinguished Name #1
|
|
* ... .. ... length of DN 2, etc.
|
|
*/
|
|
buf = ssl->out_msg;
|
|
p = buf + 4;
|
|
|
|
/*
|
|
* Supported certificate types
|
|
*
|
|
* ClientCertificateType certificate_types<1..2^8-1>;
|
|
* enum { (255) } ClientCertificateType;
|
|
*/
|
|
ct_len = 0;
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
p[1 + ct_len++] = MBEDTLS_SSL_CERT_TYPE_RSA_SIGN;
|
|
#endif
|
|
#if defined(MBEDTLS_ECDSA_C)
|
|
p[1 + ct_len++] = MBEDTLS_SSL_CERT_TYPE_ECDSA_SIGN;
|
|
#endif
|
|
|
|
p[0] = (unsigned char) ct_len++;
|
|
p += ct_len;
|
|
|
|
sa_len = 0;
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
/*
|
|
* Add signature_algorithms for verify (TLS 1.2)
|
|
*
|
|
* SignatureAndHashAlgorithm supported_signature_algorithms<2..2^16-2>;
|
|
*
|
|
* struct {
|
|
* HashAlgorithm hash;
|
|
* SignatureAlgorithm signature;
|
|
* } SignatureAndHashAlgorithm;
|
|
*
|
|
* enum { (255) } HashAlgorithm;
|
|
* enum { (255) } SignatureAlgorithm;
|
|
*/
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
|
|
{
|
|
const int *cur;
|
|
|
|
/*
|
|
* Supported signature algorithms
|
|
*/
|
|
for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ )
|
|
{
|
|
unsigned char hash = mbedtls_ssl_hash_from_md_alg( *cur );
|
|
|
|
if( MBEDTLS_SSL_HASH_NONE == hash || mbedtls_ssl_set_calc_verify_md( ssl, hash ) )
|
|
continue;
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
p[2 + sa_len++] = hash;
|
|
p[2 + sa_len++] = MBEDTLS_SSL_SIG_RSA;
|
|
#endif
|
|
#if defined(MBEDTLS_ECDSA_C)
|
|
p[2 + sa_len++] = hash;
|
|
p[2 + sa_len++] = MBEDTLS_SSL_SIG_ECDSA;
|
|
#endif
|
|
}
|
|
|
|
p[0] = (unsigned char)( sa_len >> 8 );
|
|
p[1] = (unsigned char)( sa_len );
|
|
sa_len += 2;
|
|
p += sa_len;
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
|
|
/*
|
|
* DistinguishedName certificate_authorities<0..2^16-1>;
|
|
* opaque DistinguishedName<1..2^16-1>;
|
|
*/
|
|
p += 2;
|
|
|
|
total_dn_size = 0;
|
|
|
|
if( ssl->conf->cert_req_ca_list == MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED )
|
|
{
|
|
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
|
|
if( ssl->handshake->sni_ca_chain != NULL )
|
|
crt = ssl->handshake->sni_ca_chain;
|
|
else
|
|
#endif
|
|
crt = ssl->conf->ca_chain;
|
|
|
|
while( crt != NULL && crt->version != 0 )
|
|
{
|
|
dn_size = crt->subject_raw.len;
|
|
|
|
if( end < p ||
|
|
(size_t)( end - p ) < dn_size ||
|
|
(size_t)( end - p ) < 2 + dn_size )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "skipping CAs: buffer too short" ) );
|
|
break;
|
|
}
|
|
|
|
*p++ = (unsigned char)( dn_size >> 8 );
|
|
*p++ = (unsigned char)( dn_size );
|
|
memcpy( p, crt->subject_raw.p, dn_size );
|
|
p += dn_size;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "requested DN", p - dn_size, dn_size );
|
|
|
|
total_dn_size += 2 + dn_size;
|
|
crt = crt->next;
|
|
}
|
|
}
|
|
|
|
ssl->out_msglen = p - buf;
|
|
ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
|
|
ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE_REQUEST;
|
|
ssl->out_msg[4 + ct_len + sa_len] = (unsigned char)( total_dn_size >> 8 );
|
|
ssl->out_msg[5 + ct_len + sa_len] = (unsigned char)( total_dn_size );
|
|
|
|
ret = mbedtls_ssl_write_record( ssl );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate request" ) );
|
|
|
|
return( ret );
|
|
}
|
|
#endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED &&
|
|
!MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED &&
|
|
!MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED &&
|
|
!MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED &&
|
|
!MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED &&
|
|
!MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \
|
|
defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
|
|
static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
if( ! mbedtls_pk_can_do( mbedtls_ssl_own_key( ssl ), MBEDTLS_PK_ECKEY ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key not ECDH capable" ) );
|
|
return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
|
|
}
|
|
|
|
if( ( ret = mbedtls_ecdh_get_params( &ssl->handshake->ecdh_ctx,
|
|
mbedtls_pk_ec( *mbedtls_ssl_own_key( ssl ) ),
|
|
MBEDTLS_ECDH_OURS ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_get_params" ), ret );
|
|
return( ret );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) ||
|
|
MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
|
|
|
|
static int ssl_write_server_key_exchange( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
size_t n = 0;
|
|
const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
|
|
ssl->transform_negotiate->ciphersuite_info;
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__SOME_PFS__ENABLED)
|
|
unsigned char *p = ssl->out_msg + 4;
|
|
size_t len = 0;
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
|
|
unsigned char *dig_signed = p;
|
|
size_t dig_signed_len = 0;
|
|
#endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */
|
|
#endif /* MBEDTLS_KEY_EXCHANGE__SOME_PFS__ENABLED */
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server key exchange" ) );
|
|
|
|
/*
|
|
*
|
|
* Part 1: Extract static ECDH parameters and abort
|
|
* if ServerKeyExchange not needed.
|
|
*
|
|
*/
|
|
|
|
/* For suites involving ECDH, extract DH parameters
|
|
* from certificate at this point. */
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__SOME__ECDH_ENABLED)
|
|
if( mbedtls_ssl_ciphersuite_uses_ecdh( ciphersuite_info ) )
|
|
{
|
|
ssl_get_ecdh_params_from_cert( ssl );
|
|
}
|
|
#endif /* MBEDTLS_KEY_EXCHANGE__SOME__ECDH_ENABLED */
|
|
|
|
/* Key exchanges not involving ephemeral keys don't use
|
|
* ServerKeyExchange, so end here. */
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED)
|
|
if( mbedtls_ssl_ciphersuite_no_pfs( ciphersuite_info ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write server key exchange" ) );
|
|
ssl->state++;
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_KEY_EXCHANGE__NON_PFS__ENABLED */
|
|
|
|
/*
|
|
*
|
|
* Part 2: Provide key exchange parameters for chosen ciphersuite.
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* - ECJPAKE key exchanges
|
|
*/
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
|
|
{
|
|
const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
|
|
|
|
ret = mbedtls_ecjpake_write_round_two( &ssl->handshake->ecjpake_ctx,
|
|
p, end - p, &len, ssl->conf->f_rng, ssl->conf->p_rng );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_write_round_two", ret );
|
|
return( ret );
|
|
}
|
|
|
|
p += len;
|
|
n += len;
|
|
}
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
|
|
|
|
/*
|
|
* For (EC)DHE key exchanges with PSK, parameters are prefixed by support
|
|
* identity hint (RFC 4279, Sec. 3). Until someone needs this feature,
|
|
* we use empty support identity hints here.
|
|
**/
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) || \
|
|
defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
|
|
{
|
|
*(p++) = 0x00;
|
|
*(p++) = 0x00;
|
|
|
|
n += 2;
|
|
}
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED ||
|
|
MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
|
|
|
|
/*
|
|
* - DHE key exchanges
|
|
*/
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__SOME__DHE_ENABLED)
|
|
if( mbedtls_ssl_ciphersuite_uses_dhe( ciphersuite_info ) )
|
|
{
|
|
if( ssl->conf->dhm_P.p == NULL || ssl->conf->dhm_G.p == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "no DH parameters set" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
/*
|
|
* Ephemeral DH parameters:
|
|
*
|
|
* struct {
|
|
* opaque dh_p<1..2^16-1>;
|
|
* opaque dh_g<1..2^16-1>;
|
|
* opaque dh_Ys<1..2^16-1>;
|
|
* } ServerDHParams;
|
|
*/
|
|
if( ( ret = mbedtls_dhm_set_group( &ssl->handshake->dhm_ctx,
|
|
&ssl->conf->dhm_P,
|
|
&ssl->conf->dhm_G ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_set_group", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = mbedtls_dhm_make_params( &ssl->handshake->dhm_ctx,
|
|
(int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ),
|
|
p, &len, ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_params", ret );
|
|
return( ret );
|
|
}
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
|
|
dig_signed = p;
|
|
dig_signed_len = len;
|
|
#endif
|
|
|
|
p += len;
|
|
n += len;
|
|
|
|
MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->handshake->dhm_ctx.X );
|
|
MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->handshake->dhm_ctx.P );
|
|
MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->handshake->dhm_ctx.G );
|
|
MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->handshake->dhm_ctx.GX );
|
|
}
|
|
#endif /* MBEDTLS_KEY_EXCHANGE__SOME__DHE_ENABLED */
|
|
|
|
/*
|
|
* - ECDHE key exchanges
|
|
*/
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__SOME__ECDHE_ENABLED)
|
|
if( mbedtls_ssl_ciphersuite_uses_ecdhe( ciphersuite_info ) )
|
|
{
|
|
/*
|
|
* Ephemeral ECDH parameters:
|
|
*
|
|
* struct {
|
|
* ECParameters curve_params;
|
|
* ECPoint public;
|
|
* } ServerECDHParams;
|
|
*/
|
|
const mbedtls_ecp_curve_info **curve = NULL;
|
|
const mbedtls_ecp_group_id *gid;
|
|
|
|
/* Match our preference list against the offered curves */
|
|
for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ )
|
|
for( curve = ssl->handshake->curves; *curve != NULL; curve++ )
|
|
if( (*curve)->grp_id == *gid )
|
|
goto curve_matching_done;
|
|
|
|
curve_matching_done:
|
|
if( curve == NULL || *curve == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "no matching curve for ECDHE" ) );
|
|
return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDHE curve: %s", (*curve)->name ) );
|
|
|
|
if( ( ret = mbedtls_ecp_group_load( &ssl->handshake->ecdh_ctx.grp,
|
|
(*curve)->grp_id ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecp_group_load", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = mbedtls_ecdh_make_params( &ssl->handshake->ecdh_ctx, &len,
|
|
p, MBEDTLS_SSL_MAX_CONTENT_LEN - n,
|
|
ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_params", ret );
|
|
return( ret );
|
|
}
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
|
|
dig_signed = p;
|
|
dig_signed_len = len;
|
|
#endif
|
|
|
|
p += len;
|
|
n += len;
|
|
|
|
MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Q ", &ssl->handshake->ecdh_ctx.Q );
|
|
}
|
|
#endif /* MBEDTLS_KEY_EXCHANGE__SOME__ECDHE_ENABLED */
|
|
|
|
/*
|
|
*
|
|
* Part 3: For key exchanges involving the server signing the
|
|
* exchange parameters, compute and add the signature here.
|
|
*
|
|
*/
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
|
|
if( mbedtls_ssl_ciphersuite_uses_server_signature( ciphersuite_info ) )
|
|
{
|
|
size_t signature_len = 0;
|
|
unsigned int hashlen = 0;
|
|
unsigned char hash[64];
|
|
|
|
/*
|
|
* 3.1: Choose hash algorithm:
|
|
* A: For TLS 1.2, obey signature-hash-algorithm extension
|
|
* to choose appropriate hash.
|
|
* B: For SSL3, TLS1.0, TLS1.1 and ECDHE_ECDSA, use SHA1
|
|
* (RFC 4492, Sec. 5.4)
|
|
* C: Otherwise, use MD5 + SHA1 (RFC 4346, Sec. 7.4.3)
|
|
*/
|
|
|
|
mbedtls_md_type_t md_alg;
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
mbedtls_pk_type_t sig_alg =
|
|
mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
|
|
{
|
|
/* A: For TLS 1.2, obey signature-hash-algorithm extension
|
|
* (RFC 5246, Sec. 7.4.1.4.1). */
|
|
if( sig_alg == MBEDTLS_PK_NONE ||
|
|
( md_alg = mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs,
|
|
sig_alg ) ) == MBEDTLS_MD_NONE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
/* (... because we choose a cipher suite
|
|
* only if there is a matching hash.) */
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_1)
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
|
|
{
|
|
/* B: Default hash SHA1 */
|
|
md_alg = MBEDTLS_MD_SHA1;
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \
|
|
MBEDTLS_SSL_PROTO_TLS1_1 */
|
|
{
|
|
/* C: MD5 + SHA1 */
|
|
md_alg = MBEDTLS_MD_NONE;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "pick hash algorithm %d for signing", md_alg ) );
|
|
|
|
/*
|
|
* 3.2: Compute the hash to be signed
|
|
*/
|
|
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
|
|
defined(MBEDTLS_SSL_PROTO_TLS1_1)
|
|
if( md_alg == MBEDTLS_MD_NONE )
|
|
{
|
|
hashlen = 36;
|
|
ret = mbedtls_ssl_get_key_exchange_md_ssl_tls( ssl, hash,
|
|
dig_signed,
|
|
dig_signed_len );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
}
|
|
else
|
|
#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)
|
|
if( md_alg != MBEDTLS_MD_NONE )
|
|
{
|
|
/* Info from md_alg will be used instead */
|
|
hashlen = 0;
|
|
ret = mbedtls_ssl_get_key_exchange_md_tls1_2( ssl, hash,
|
|
dig_signed,
|
|
dig_signed_len,
|
|
md_alg );
|
|
if( ret != 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 );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen != 0 ? hashlen :
|
|
(unsigned int) ( mbedtls_md_get_size( mbedtls_md_info_from_type( md_alg ) ) ) );
|
|
|
|
/*
|
|
* 3.3: Compute and add the signature
|
|
*/
|
|
if( mbedtls_ssl_own_key( ssl ) == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key" ) );
|
|
return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
|
|
}
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
|
|
{
|
|
/*
|
|
* For TLS 1.2, we need to specify signature and hash algorithm
|
|
* explicitly through a prefix to the signature.
|
|
*
|
|
* struct {
|
|
* HashAlgorithm hash;
|
|
* SignatureAlgorithm signature;
|
|
* } SignatureAndHashAlgorithm;
|
|
*
|
|
* struct {
|
|
* SignatureAndHashAlgorithm algorithm;
|
|
* opaque signature<0..2^16-1>;
|
|
* } DigitallySigned;
|
|
*
|
|
*/
|
|
|
|
*(p++) = mbedtls_ssl_hash_from_md_alg( md_alg );
|
|
*(p++) = mbedtls_ssl_sig_from_pk_alg( sig_alg );
|
|
|
|
n += 2;
|
|
}
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
|
|
if( ( ret = mbedtls_pk_sign( mbedtls_ssl_own_key( ssl ), md_alg, hash, hashlen,
|
|
p + 2 , &signature_len, ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_sign", ret );
|
|
return( ret );
|
|
}
|
|
|
|
*(p++) = (unsigned char)( signature_len >> 8 );
|
|
*(p++) = (unsigned char)( signature_len );
|
|
n += 2;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "my signature", p, signature_len );
|
|
|
|
n += signature_len;
|
|
}
|
|
#endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */
|
|
|
|
/* Done with actual work; add header and send. */
|
|
|
|
ssl->out_msglen = 4 + n;
|
|
ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
|
|
ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_KEY_EXCHANGE;
|
|
|
|
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 server key exchange" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int ssl_write_server_hello_done( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server hello done" ) );
|
|
|
|
ssl->out_msglen = 4;
|
|
ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
|
|
ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_HELLO_DONE;
|
|
|
|
ssl->state++;
|
|
|
|
#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 server hello done" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \
|
|
defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
|
|
static int ssl_parse_client_dh_public( mbedtls_ssl_context *ssl, unsigned char **p,
|
|
const unsigned char *end )
|
|
{
|
|
int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
|
|
size_t n;
|
|
|
|
/*
|
|
* Receive G^Y mod P, premaster = (G^Y)^X mod P
|
|
*/
|
|
if( *p + 2 > end )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
|
|
}
|
|
|
|
n = ( (*p)[0] << 8 ) | (*p)[1];
|
|
*p += 2;
|
|
|
|
if( *p + n > end )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
|
|
}
|
|
|
|
if( ( ret = mbedtls_dhm_read_public( &ssl->handshake->dhm_ctx, *p, n ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_read_public", ret );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP );
|
|
}
|
|
|
|
*p += n;
|
|
|
|
MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->dhm_ctx.GY );
|
|
|
|
return( ret );
|
|
}
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED ||
|
|
MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \
|
|
defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
|
|
static int ssl_parse_encrypted_pms( mbedtls_ssl_context *ssl,
|
|
const unsigned char *p,
|
|
const unsigned char *end,
|
|
size_t pms_offset )
|
|
{
|
|
int ret;
|
|
size_t len = mbedtls_pk_get_len( mbedtls_ssl_own_key( ssl ) );
|
|
unsigned char *pms = ssl->handshake->premaster + pms_offset;
|
|
unsigned char ver[2];
|
|
unsigned char fake_pms[48], peer_pms[48];
|
|
unsigned char mask;
|
|
size_t i, peer_pmslen;
|
|
unsigned int diff;
|
|
|
|
if( ! mbedtls_pk_can_do( mbedtls_ssl_own_key( ssl ), MBEDTLS_PK_RSA ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no RSA private key" ) );
|
|
return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
|
|
}
|
|
|
|
/*
|
|
* Decrypt the premaster using own private RSA key
|
|
*/
|
|
#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 )
|
|
{
|
|
if ( p + 2 > end ) {
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
|
|
}
|
|
if( *p++ != ( ( len >> 8 ) & 0xFF ) ||
|
|
*p++ != ( ( len ) & 0xFF ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if( p + len != end )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
|
|
}
|
|
|
|
mbedtls_ssl_write_version( ssl->handshake->max_major_ver,
|
|
ssl->handshake->max_minor_ver,
|
|
ssl->conf->transport, ver );
|
|
|
|
/*
|
|
* Protection against Bleichenbacher's attack: invalid PKCS#1 v1.5 padding
|
|
* must not cause the connection to end immediately; instead, send a
|
|
* bad_record_mac later in the handshake.
|
|
* Also, avoid data-dependant branches here to protect against
|
|
* timing-based variants.
|
|
*/
|
|
ret = ssl->conf->f_rng( ssl->conf->p_rng, fake_pms, sizeof( fake_pms ) );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
ret = mbedtls_pk_decrypt( mbedtls_ssl_own_key( ssl ), p, len,
|
|
peer_pms, &peer_pmslen,
|
|
sizeof( peer_pms ),
|
|
ssl->conf->f_rng, ssl->conf->p_rng );
|
|
|
|
diff = (unsigned int) ret;
|
|
diff |= peer_pmslen ^ 48;
|
|
diff |= peer_pms[0] ^ ver[0];
|
|
diff |= peer_pms[1] ^ ver[1];
|
|
|
|
#if defined(MBEDTLS_SSL_DEBUG_ALL)
|
|
if( diff != 0 )
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
|
|
#endif
|
|
|
|
if( sizeof( ssl->handshake->premaster ) < pms_offset ||
|
|
sizeof( ssl->handshake->premaster ) - pms_offset < 48 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
ssl->handshake->pmslen = 48;
|
|
|
|
/* mask = diff ? 0xff : 0x00 using bit operations to avoid branches */
|
|
/* MSVC has a warning about unary minus on unsigned, but this is
|
|
* well-defined and precisely what we want to do here */
|
|
#if defined(_MSC_VER)
|
|
#pragma warning( push )
|
|
#pragma warning( disable : 4146 )
|
|
#endif
|
|
mask = - ( ( diff | - diff ) >> ( sizeof( unsigned int ) * 8 - 1 ) );
|
|
#if defined(_MSC_VER)
|
|
#pragma warning( pop )
|
|
#endif
|
|
|
|
for( i = 0; i < ssl->handshake->pmslen; i++ )
|
|
pms[i] = ( mask & fake_pms[i] ) | ( (~mask) & peer_pms[i] );
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED ||
|
|
MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
|
|
static int ssl_parse_client_psk_identity( mbedtls_ssl_context *ssl, unsigned char **p,
|
|
const unsigned char *end )
|
|
{
|
|
int ret = 0;
|
|
size_t n;
|
|
|
|
if( ssl->conf->f_psk == NULL &&
|
|
( ssl->conf->psk == NULL || ssl->conf->psk_identity == NULL ||
|
|
ssl->conf->psk_identity_len == 0 || ssl->conf->psk_len == 0 ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no pre-shared key" ) );
|
|
return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
|
|
}
|
|
|
|
/*
|
|
* Receive client pre-shared key identity name
|
|
*/
|
|
if( end - *p < 2 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
|
|
}
|
|
|
|
n = ( (*p)[0] << 8 ) | (*p)[1];
|
|
*p += 2;
|
|
|
|
if( n < 1 || n > 65535 || n > (size_t) ( end - *p ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
|
|
}
|
|
|
|
if( ssl->conf->f_psk != NULL )
|
|
{
|
|
if( ssl->conf->f_psk( ssl->conf->p_psk, ssl, *p, n ) != 0 )
|
|
ret = MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY;
|
|
}
|
|
else
|
|
{
|
|
/* Identity is not a big secret since clients send it in the clear,
|
|
* but treat it carefully anyway, just in case */
|
|
if( n != ssl->conf->psk_identity_len ||
|
|
mbedtls_ssl_safer_memcmp( ssl->conf->psk_identity, *p, n ) != 0 )
|
|
{
|
|
ret = MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY;
|
|
}
|
|
}
|
|
|
|
if( ret == MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "Unknown PSK identity", *p, n );
|
|
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
|
|
MBEDTLS_SSL_ALERT_MSG_UNKNOWN_PSK_IDENTITY );
|
|
return( MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY );
|
|
}
|
|
|
|
*p += n;
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
|
|
|
|
static int ssl_parse_client_key_exchange( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
|
|
unsigned char *p, *end;
|
|
|
|
ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client key exchange" ) );
|
|
|
|
if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
|
|
end = ssl->in_msg + ssl->in_hslen;
|
|
|
|
if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
|
|
}
|
|
|
|
if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_KEY_EXCHANGE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
|
|
}
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED)
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA )
|
|
{
|
|
if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( p != end )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
|
|
}
|
|
|
|
if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx,
|
|
ssl->handshake->premaster,
|
|
MBEDTLS_PREMASTER_SIZE,
|
|
&ssl->handshake->pmslen,
|
|
ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED */
|
|
#if 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)
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA )
|
|
{
|
|
if( ( ret = mbedtls_ecdh_read_public( &ssl->handshake->ecdh_ctx,
|
|
p, end - p) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_read_public", ret );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Qp ", &ssl->handshake->ecdh_ctx.Qp );
|
|
|
|
if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx,
|
|
&ssl->handshake->pmslen,
|
|
ssl->handshake->premaster,
|
|
MBEDTLS_MPI_MAX_SIZE,
|
|
ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MPI( 3, "ECDH: z ", &ssl->handshake->ecdh_ctx.z );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
|
|
MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ||
|
|
MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED ||
|
|
MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK )
|
|
{
|
|
if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( p != end )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
|
|
}
|
|
|
|
if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
|
|
ciphersuite_info->key_exchange ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
|
|
{
|
|
if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 2 ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_encrypted_pms" ), ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
|
|
ciphersuite_info->key_exchange ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
|
|
{
|
|
if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
|
|
return( ret );
|
|
}
|
|
if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( p != end )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
|
|
}
|
|
|
|
if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
|
|
ciphersuite_info->key_exchange ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
|
|
{
|
|
if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = mbedtls_ecdh_read_public( &ssl->handshake->ecdh_ctx,
|
|
p, end - p ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_read_public", ret );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Qp ", &ssl->handshake->ecdh_ctx.Qp );
|
|
|
|
if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
|
|
ciphersuite_info->key_exchange ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED)
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA )
|
|
{
|
|
if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 0 ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_parse_encrypted_pms_secret" ), ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
|
|
{
|
|
ret = mbedtls_ecjpake_read_round_two( &ssl->handshake->ecjpake_ctx,
|
|
p, end - p );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_two", ret );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
|
|
}
|
|
|
|
ret = mbedtls_ecjpake_derive_secret( &ssl->handshake->ecjpake_ctx,
|
|
ssl->handshake->premaster, 32, &ssl->handshake->pmslen,
|
|
ssl->conf->f_rng, ssl->conf->p_rng );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_derive_secret", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
|
|
return( ret );
|
|
}
|
|
|
|
ssl->state++;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client key exchange" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
#if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \
|
|
!defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
|
|
!defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \
|
|
!defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \
|
|
!defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)&& \
|
|
!defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
|
|
static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl )
|
|
{
|
|
const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
|
|
ssl->transform_negotiate->ciphersuite_info;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) );
|
|
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
|
|
ssl->state++;
|
|
return( 0 );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
#else
|
|
static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
|
|
size_t i, sig_len;
|
|
unsigned char hash[48];
|
|
unsigned char *hash_start = hash;
|
|
size_t hashlen;
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
mbedtls_pk_type_t pk_alg;
|
|
#endif
|
|
mbedtls_md_type_t md_alg;
|
|
const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
|
|
ssl->transform_negotiate->ciphersuite_info;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) );
|
|
|
|
if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
|
|
ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ||
|
|
ssl->session_negotiate->peer_cert == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
|
|
ssl->state++;
|
|
return( 0 );
|
|
}
|
|
|
|
/* Read the message without adding it to the checksum */
|
|
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_handle_message_type" ), ret );
|
|
return( ret );
|
|
}
|
|
|
|
ssl->state++;
|
|
|
|
/* Process the message contents */
|
|
if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ||
|
|
ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE_VERIFY )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
|
|
}
|
|
|
|
i = mbedtls_ssl_hs_hdr_len( ssl );
|
|
|
|
/*
|
|
* struct {
|
|
* SignatureAndHashAlgorithm algorithm; -- TLS 1.2 only
|
|
* opaque signature<0..2^16-1>;
|
|
* } DigitallySigned;
|
|
*/
|
|
#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 )
|
|
{
|
|
md_alg = MBEDTLS_MD_NONE;
|
|
hashlen = 36;
|
|
|
|
/* For ECDSA, use SHA-1, not MD-5 + SHA-1 */
|
|
if( mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk,
|
|
MBEDTLS_PK_ECDSA ) )
|
|
{
|
|
hash_start += 16;
|
|
hashlen -= 16;
|
|
md_alg = MBEDTLS_MD_SHA1;
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 ||
|
|
MBEDTLS_SSL_PROTO_TLS1_1 */
|
|
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
|
|
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
|
|
{
|
|
if( i + 2 > ssl->in_hslen )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
|
|
}
|
|
|
|
/*
|
|
* Hash
|
|
*/
|
|
md_alg = mbedtls_ssl_md_alg_from_hash( ssl->in_msg[i] );
|
|
|
|
if( md_alg == MBEDTLS_MD_NONE || mbedtls_ssl_set_calc_verify_md( ssl, ssl->in_msg[i] ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "peer not adhering to requested sig_alg"
|
|
" for verify message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
|
|
}
|
|
|
|
#if !defined(MBEDTLS_MD_SHA1)
|
|
if( MBEDTLS_MD_SHA1 == md_alg )
|
|
hash_start += 16;
|
|
#endif
|
|
|
|
/* Info from md_alg will be used instead */
|
|
hashlen = 0;
|
|
|
|
i++;
|
|
|
|
/*
|
|
* Signature
|
|
*/
|
|
if( ( pk_alg = mbedtls_ssl_pk_alg_from_sig( ssl->in_msg[i] ) )
|
|
== MBEDTLS_PK_NONE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "peer not adhering to requested sig_alg"
|
|
" for verify message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
|
|
}
|
|
|
|
/*
|
|
* Check the certificate's key type matches the signature alg
|
|
*/
|
|
if( ! mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk, pk_alg ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "sig_alg doesn't match cert key" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
|
|
}
|
|
|
|
i++;
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
if( i + 2 > ssl->in_hslen )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
|
|
}
|
|
|
|
sig_len = ( ssl->in_msg[i] << 8 ) | ssl->in_msg[i+1];
|
|
i += 2;
|
|
|
|
if( i + sig_len != ssl->in_hslen )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
|
|
}
|
|
|
|
/* Calculate hash and verify signature */
|
|
ssl->handshake->calc_verify( ssl, hash );
|
|
|
|
if( ( ret = mbedtls_pk_verify( &ssl->session_negotiate->peer_cert->pk,
|
|
md_alg, hash_start, hashlen,
|
|
ssl->in_msg + i, sig_len ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify", ret );
|
|
return( ret );
|
|
}
|
|
|
|
mbedtls_ssl_update_handshake_status( ssl );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate verify" ) );
|
|
|
|
return( ret );
|
|
}
|
|
#endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED &&
|
|
!MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED &&
|
|
!MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED &&
|
|
!MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED &&
|
|
!MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED &&
|
|
!MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
|
|
|
|
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
|
|
static int ssl_write_new_session_ticket( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
size_t tlen;
|
|
uint32_t lifetime;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write new session ticket" ) );
|
|
|
|
ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
|
|
ssl->out_msg[0] = MBEDTLS_SSL_HS_NEW_SESSION_TICKET;
|
|
|
|
/*
|
|
* struct {
|
|
* uint32 ticket_lifetime_hint;
|
|
* opaque ticket<0..2^16-1>;
|
|
* } NewSessionTicket;
|
|
*
|
|
* 4 . 7 ticket_lifetime_hint (0 = unspecified)
|
|
* 8 . 9 ticket_len (n)
|
|
* 10 . 9+n ticket content
|
|
*/
|
|
|
|
if( ( ret = ssl->conf->f_ticket_write( ssl->conf->p_ticket,
|
|
ssl->session_negotiate,
|
|
ssl->out_msg + 10,
|
|
ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN,
|
|
&tlen, &lifetime ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_ticket_write", ret );
|
|
tlen = 0;
|
|
}
|
|
|
|
ssl->out_msg[4] = ( lifetime >> 24 ) & 0xFF;
|
|
ssl->out_msg[5] = ( lifetime >> 16 ) & 0xFF;
|
|
ssl->out_msg[6] = ( lifetime >> 8 ) & 0xFF;
|
|
ssl->out_msg[7] = ( lifetime ) & 0xFF;
|
|
|
|
ssl->out_msg[8] = (unsigned char)( ( tlen >> 8 ) & 0xFF );
|
|
ssl->out_msg[9] = (unsigned char)( ( tlen ) & 0xFF );
|
|
|
|
ssl->out_msglen = 10 + tlen;
|
|
|
|
/*
|
|
* Morally equivalent to updating ssl->state, but NewSessionTicket and
|
|
* ChangeCipherSpec share the same state.
|
|
*/
|
|
ssl->handshake->new_session_ticket = 0;
|
|
|
|
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 new session ticket" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_SSL_SESSION_TICKETS */
|
|
|
|
/*
|
|
* SSL handshake -- server side -- single step
|
|
*/
|
|
int mbedtls_ssl_handshake_server_step( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = 0;
|
|
|
|
if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER || ssl->handshake == NULL )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "server state: %d", ssl->state ) );
|
|
|
|
if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
|
|
return( ret );
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
|
|
ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
|
|
{
|
|
if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
|
|
return( ret );
|
|
}
|
|
#endif
|
|
|
|
switch( ssl->state )
|
|
{
|
|
case MBEDTLS_SSL_HELLO_REQUEST:
|
|
ssl->state = MBEDTLS_SSL_CLIENT_HELLO;
|
|
break;
|
|
|
|
/*
|
|
* <== ClientHello
|
|
*/
|
|
case MBEDTLS_SSL_CLIENT_HELLO:
|
|
ret = ssl_parse_client_hello( ssl );
|
|
break;
|
|
|
|
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
|
case MBEDTLS_SSL_SERVER_HELLO_VERIFY_REQUEST_SENT:
|
|
return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED );
|
|
#endif
|
|
|
|
/*
|
|
* ==> ServerHello
|
|
* Certificate
|
|
* ( ServerKeyExchange )
|
|
* ( CertificateRequest )
|
|
* ServerHelloDone
|
|
*/
|
|
case MBEDTLS_SSL_SERVER_HELLO:
|
|
ret = ssl_write_server_hello( ssl );
|
|
break;
|
|
|
|
case MBEDTLS_SSL_SERVER_CERTIFICATE:
|
|
ret = mbedtls_ssl_write_certificate( ssl );
|
|
break;
|
|
|
|
case MBEDTLS_SSL_SERVER_KEY_EXCHANGE:
|
|
ret = ssl_write_server_key_exchange( ssl );
|
|
break;
|
|
|
|
case MBEDTLS_SSL_CERTIFICATE_REQUEST:
|
|
ret = ssl_write_certificate_request( ssl );
|
|
break;
|
|
|
|
case MBEDTLS_SSL_SERVER_HELLO_DONE:
|
|
ret = ssl_write_server_hello_done( ssl );
|
|
break;
|
|
|
|
/*
|
|
* <== ( Certificate/Alert )
|
|
* ClientKeyExchange
|
|
* ( CertificateVerify )
|
|
* ChangeCipherSpec
|
|
* Finished
|
|
*/
|
|
case MBEDTLS_SSL_CLIENT_CERTIFICATE:
|
|
ret = mbedtls_ssl_parse_certificate( ssl );
|
|
break;
|
|
|
|
case MBEDTLS_SSL_CLIENT_KEY_EXCHANGE:
|
|
ret = ssl_parse_client_key_exchange( ssl );
|
|
break;
|
|
|
|
case MBEDTLS_SSL_CERTIFICATE_VERIFY:
|
|
ret = ssl_parse_certificate_verify( ssl );
|
|
break;
|
|
|
|
case MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC:
|
|
ret = mbedtls_ssl_parse_change_cipher_spec( ssl );
|
|
break;
|
|
|
|
case MBEDTLS_SSL_CLIENT_FINISHED:
|
|
ret = mbedtls_ssl_parse_finished( ssl );
|
|
break;
|
|
|
|
/*
|
|
* ==> ( NewSessionTicket )
|
|
* ChangeCipherSpec
|
|
* Finished
|
|
*/
|
|
case MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC:
|
|
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
|
|
if( ssl->handshake->new_session_ticket != 0 )
|
|
ret = ssl_write_new_session_ticket( ssl );
|
|
else
|
|
#endif
|
|
ret = mbedtls_ssl_write_change_cipher_spec( ssl );
|
|
break;
|
|
|
|
case MBEDTLS_SSL_SERVER_FINISHED:
|
|
ret = mbedtls_ssl_write_finished( ssl );
|
|
break;
|
|
|
|
case MBEDTLS_SSL_FLUSH_BUFFERS:
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) );
|
|
ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
|
|
break;
|
|
|
|
case MBEDTLS_SSL_HANDSHAKE_WRAPUP:
|
|
mbedtls_ssl_handshake_wrapup( ssl );
|
|
break;
|
|
|
|
default:
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
return( ret );
|
|
}
|
|
#endif /* MBEDTLS_SSL_SRV_C */
|