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1048 lines
28 KiB
C
1048 lines
28 KiB
C
/* -*- c-basic-offset: 8 -*-
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rdesktop: A Remote Desktop Protocol client.
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Protocol services - RDP encryption and licensing
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Copyright (C) Matthew Chapman <matthewc.unsw.edu.au> 1999-2008
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Copyright 2005-2011 Peter Astrand <astrand@cendio.se> for Cendio AB
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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 3 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "precomp.h"
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void *
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rdssl_sha1_info_create(void);
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void
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rdssl_sha1_info_delete(void * sha1_info);
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void
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rdssl_sha1_clear(void * sha1_info);
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void
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rdssl_sha1_transform(void * sha1_info, char * data, int len);
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void
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rdssl_sha1_complete(void * sha1_info, char * data);
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void *
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rdssl_md5_info_create(void);
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void
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rdssl_md5_info_delete(void * md5_info);
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void *
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rdssl_md5_info_create(void);
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void
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rdssl_md5_info_delete(void * md5_info);
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void
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rdssl_md5_clear(void * md5_info);
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void
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rdssl_md5_transform(void * md5_info, char * data, int len);
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void
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rdssl_md5_complete(void * md5_info, char * data);
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void *
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rdssl_rc4_info_create(void);
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void
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rdssl_rc4_info_delete(void * rc4_info);
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void
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rdssl_rc4_set_key(void * rc4_info, char * key, int len);
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void
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rdssl_rc4_crypt(void * rc4_info, char * in_data, char * out_data, int len);
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int
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rdssl_mod_exp(char* out, int out_len, char* in, int in_len,
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char* mod, int mod_len, char* exp, int exp_len);
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int
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rdssl_sign_ok(char* e_data, int e_len, char* n_data, int n_len,
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char* sign_data, int sign_len, char* sign_data2, int sign_len2, char* testkey);
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PCCERT_CONTEXT
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rdssl_cert_read(uint8 * data, uint32 len);
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void
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rdssl_cert_free(PCCERT_CONTEXT context);
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uint8 *
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rdssl_cert_to_rkey(PCCERT_CONTEXT cert, uint32 * key_len);
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RD_BOOL
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rdssl_certs_ok(PCCERT_CONTEXT server_cert, PCCERT_CONTEXT cacert);
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int
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rdssl_rkey_get_exp_mod(uint8 * rkey, uint8 * exponent, uint32 max_exp_len, uint8 * modulus,
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uint32 max_mod_len);
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void
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rdssl_rkey_free(uint8 * rkey);
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extern char g_hostname[16];
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extern int g_width;
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extern int g_height;
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extern unsigned int g_keylayout;
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extern int g_keyboard_type;
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extern int g_keyboard_subtype;
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extern int g_keyboard_functionkeys;
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extern RD_BOOL g_encryption;
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extern RD_BOOL g_licence_issued;
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extern RD_BOOL g_licence_error_result;
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extern RDP_VERSION g_rdp_version;
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extern RD_BOOL g_console_session;
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extern uint32 g_redirect_session_id;
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extern int g_server_depth;
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extern VCHANNEL g_channels[];
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extern unsigned int g_num_channels;
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extern uint8 g_client_random[SEC_RANDOM_SIZE];
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static int g_rc4_key_len;
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static void * g_rc4_decrypt_key;
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static void * g_rc4_encrypt_key;
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static uint32 g_server_public_key_len;
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static uint8 g_sec_sign_key[16];
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static uint8 g_sec_decrypt_key[16];
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static uint8 g_sec_encrypt_key[16];
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static uint8 g_sec_decrypt_update_key[16];
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static uint8 g_sec_encrypt_update_key[16];
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static uint8 g_sec_crypted_random[SEC_MAX_MODULUS_SIZE];
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uint16 g_server_rdp_version = 0;
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/* These values must be available to reset state - Session Directory */
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static int g_sec_encrypt_use_count = 0;
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static int g_sec_decrypt_use_count = 0;
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#define SEC_MODULUS_SIZE 64
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static uint8 g_testkey[176] =
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{
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0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
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0x01, 0x00, 0x00, 0x00, 0x06, 0x00, 0x5c, 0x00,
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0x52, 0x53, 0x41, 0x31, 0x48, 0x00, 0x00, 0x00,
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0x00, 0x02, 0x00, 0x00, 0x3f, 0x00, 0x00, 0x00,
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0x01, 0x00, 0x01, 0x00, 0x79, 0x6f, 0xb4, 0xdf,
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0xa6, 0x95, 0xb9, 0xa9, 0x61, 0xe3, 0xc4, 0x5e,
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0xff, 0x6b, 0xd8, 0x81, 0x8a, 0x12, 0x4a, 0x93,
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0x42, 0x97, 0x18, 0x93, 0xac, 0xd1, 0x3a, 0x38,
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0x3c, 0x68, 0x50, 0x19, 0x31, 0xb6, 0x84, 0x51,
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0x79, 0xfb, 0x1c, 0xe7, 0xe3, 0x99, 0x20, 0xc7,
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0x84, 0xdf, 0xd1, 0xaa, 0xb5, 0x15, 0xef, 0x47,
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0x7e, 0xfc, 0x88, 0xeb, 0x29, 0xc3, 0x27, 0x5a,
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0x35, 0xf8, 0xfd, 0xaa, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x08, 0x00, 0x48, 0x00,
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0x32, 0x3b, 0xde, 0x6f, 0x18, 0x97, 0x1e, 0xc3,
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0x6b, 0x2b, 0x2d, 0xe4, 0xfc, 0x2d, 0xa2, 0x8e,
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0x32, 0x3c, 0xf3, 0x1b, 0x24, 0x90, 0x57, 0x4d,
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0x8e, 0xe4, 0x69, 0xfc, 0x16, 0x8d, 0x41, 0x92,
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0x78, 0xc7, 0x9c, 0xb4, 0x26, 0xff, 0xe8, 0x3e,
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0xa1, 0x8a, 0xf5, 0x57, 0xc0, 0x7f, 0x3e, 0x21,
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0x17, 0x32, 0x30, 0x6f, 0x79, 0xe1, 0x36, 0xcd,
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0xb6, 0x8e, 0xbe, 0x57, 0x57, 0xd2, 0xa9, 0x36
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};
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/*
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* I believe this is based on SSLv3 with the following differences:
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* MAC algorithm (5.2.3.1) uses only 32-bit length in place of seq_num/type/length fields
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* MAC algorithm uses SHA1 and MD5 for the two hash functions instead of one or other
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* key_block algorithm (6.2.2) uses 'X', 'YY', 'ZZZ' instead of 'A', 'BB', 'CCC'
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* key_block partitioning is different (16 bytes each: MAC secret, decrypt key, encrypt key)
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* encryption/decryption keys updated every 4096 packets
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* See http://wp.netscape.com/eng/ssl3/draft302.txt
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*/
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/*
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* 48-byte transformation used to generate master secret (6.1) and key material (6.2.2).
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* Both SHA1 and MD5 algorithms are used.
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*/
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void
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sec_hash_48(uint8 * out, uint8 * in, uint8 * salt1, uint8 * salt2, uint8 salt)
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{
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uint8 shasig[20];
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uint8 pad[4];
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void * sha;
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void * md5;
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int i;
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for (i = 0; i < 3; i++)
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{
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memset(pad, salt + i, i + 1);
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sha = rdssl_sha1_info_create();
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rdssl_sha1_clear(sha);
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rdssl_sha1_transform(sha, (char *)pad, i + 1);
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rdssl_sha1_transform(sha, (char *)in, 48);
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rdssl_sha1_transform(sha, (char *)salt1, 32);
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rdssl_sha1_transform(sha, (char *)salt2, 32);
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rdssl_sha1_complete(sha, (char *)shasig);
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rdssl_sha1_info_delete(sha);
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md5 = rdssl_md5_info_create();
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rdssl_md5_clear(md5);
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rdssl_md5_transform(md5, (char *)in, 48);
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rdssl_md5_transform(md5, (char *)shasig, 20);
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rdssl_md5_complete(md5, (char *)out + i * 16);
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rdssl_md5_info_delete(md5);
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}
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}
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/*
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* 16-byte transformation used to generate export keys (6.2.2).
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*/
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void
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sec_hash_16(uint8 * out, uint8 * in, uint8 * salt1, uint8 * salt2)
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{
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void * md5;
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md5 = rdssl_md5_info_create();
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rdssl_md5_clear(md5);
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rdssl_md5_transform(md5, (char *)in, 16);
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rdssl_md5_transform(md5, (char *)salt1, 32);
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rdssl_md5_transform(md5, (char *)salt2, 32);
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rdssl_md5_complete(md5, (char *)out);
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rdssl_md5_info_delete(md5);
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}
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/*
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* 16-byte sha1 hash
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*/
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void
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sec_hash_sha1_16(uint8 * out, uint8 * in, uint8 * salt1)
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{
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void * sha;
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sha = rdssl_sha1_info_create();
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rdssl_sha1_clear(sha);
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rdssl_sha1_transform(&sha, (char *)in, 16);
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rdssl_sha1_transform(&sha, (char *)salt1, 16);
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rdssl_sha1_complete(&sha, (char *)out);
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rdssl_sha1_info_delete(sha);
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}
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/* create string from hash */
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void
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sec_hash_to_string(char *out, int out_size, uint8 * in, int in_size)
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{
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int k;
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memset(out, 0, out_size);
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for (k = 0; k < in_size; k++, out += 2)
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{
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sprintf(out, "%.2x", in[k]);
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}
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}
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/* Reduce key entropy from 64 to 40 bits */
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static void
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sec_make_40bit(uint8 * key)
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{
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key[0] = 0xd1;
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key[1] = 0x26;
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key[2] = 0x9e;
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}
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/* Generate encryption keys given client and server randoms */
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static void
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sec_generate_keys(uint8 * client_random, uint8 * server_random, int rc4_key_size)
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{
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uint8 pre_master_secret[48];
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uint8 master_secret[48];
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uint8 key_block[48];
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/* Construct pre-master secret */
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memcpy(pre_master_secret, client_random, 24);
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memcpy(pre_master_secret + 24, server_random, 24);
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/* Generate master secret and then key material */
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sec_hash_48(master_secret, pre_master_secret, client_random, server_random, 'A');
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sec_hash_48(key_block, master_secret, client_random, server_random, 'X');
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/* First 16 bytes of key material is MAC secret */
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memcpy(g_sec_sign_key, key_block, 16);
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/* Generate export keys from next two blocks of 16 bytes */
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sec_hash_16(g_sec_decrypt_key, &key_block[16], client_random, server_random);
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sec_hash_16(g_sec_encrypt_key, &key_block[32], client_random, server_random);
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if (rc4_key_size == 1)
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{
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DEBUG(("40-bit encryption enabled\n"));
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sec_make_40bit(g_sec_sign_key);
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sec_make_40bit(g_sec_decrypt_key);
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sec_make_40bit(g_sec_encrypt_key);
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g_rc4_key_len = 8;
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}
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else
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{
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DEBUG(("rc_4_key_size == %d, 128-bit encryption enabled\n", rc4_key_size));
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g_rc4_key_len = 16;
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}
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/* Save initial RC4 keys as update keys */
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memcpy(g_sec_decrypt_update_key, g_sec_decrypt_key, 16);
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memcpy(g_sec_encrypt_update_key, g_sec_encrypt_key, 16);
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/* Initialise RC4 state arrays */
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rdssl_rc4_info_delete(g_rc4_decrypt_key);
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g_rc4_decrypt_key = rdssl_rc4_info_create();
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rdssl_rc4_set_key(g_rc4_decrypt_key, (char *)g_sec_decrypt_key, g_rc4_key_len);
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rdssl_rc4_info_delete(g_rc4_encrypt_key);
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g_rc4_encrypt_key = rdssl_rc4_info_create();
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rdssl_rc4_set_key(g_rc4_encrypt_key, (char *)g_sec_encrypt_key, g_rc4_key_len);
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}
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static uint8 pad_54[40] = {
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54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54,
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54, 54, 54,
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54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54,
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54, 54, 54
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};
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static uint8 pad_92[48] = {
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92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92,
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92, 92, 92, 92, 92, 92, 92,
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92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92,
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92, 92, 92, 92, 92, 92, 92
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};
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/* Output a uint32 into a buffer (little-endian) */
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void
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buf_out_uint32(uint8 * buffer, uint32 value)
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{
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buffer[0] = (value) & 0xff;
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buffer[1] = (value >> 8) & 0xff;
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buffer[2] = (value >> 16) & 0xff;
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buffer[3] = (value >> 24) & 0xff;
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}
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/* Generate a MAC hash (5.2.3.1), using a combination of SHA1 and MD5 */
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void
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sec_sign(uint8 * signature, int siglen, uint8 * session_key, int keylen, uint8 * data, int datalen)
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{
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uint8 shasig[20];
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uint8 md5sig[16];
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uint8 lenhdr[4];
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void * sha;
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void * md5;
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buf_out_uint32(lenhdr, datalen);
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sha = rdssl_sha1_info_create();
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rdssl_sha1_clear(sha);
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rdssl_sha1_transform(sha, (char *)session_key, keylen);
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rdssl_sha1_transform(sha, (char *)pad_54, 40);
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rdssl_sha1_transform(sha, (char *)lenhdr, 4);
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rdssl_sha1_transform(sha, (char *)data, datalen);
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rdssl_sha1_complete(sha, (char *)shasig);
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rdssl_sha1_info_delete(sha);
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md5 = rdssl_md5_info_create();
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rdssl_md5_clear(md5);
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rdssl_md5_transform(md5, (char *)session_key, keylen);
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rdssl_md5_transform(md5, (char *)pad_92, 48);
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rdssl_md5_transform(md5, (char *)shasig, 20);
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rdssl_md5_complete(md5, (char *)md5sig);
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rdssl_md5_info_delete(md5);
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memcpy(signature, md5sig, siglen);
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}
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/* Update an encryption key */
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static void
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sec_update(uint8 * key, uint8 * update_key)
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{
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uint8 shasig[20];
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void * sha;
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void * md5;
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void * update;
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sha = rdssl_sha1_info_create();
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rdssl_sha1_clear(sha);
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rdssl_sha1_transform(sha, (char *)update_key, g_rc4_key_len);
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rdssl_sha1_transform(sha, (char *)pad_54, 40);
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rdssl_sha1_transform(sha, (char *)key, g_rc4_key_len);
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rdssl_sha1_complete(sha, (char *)shasig);
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rdssl_sha1_info_delete(sha);
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md5 = rdssl_md5_info_create();
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rdssl_md5_clear(md5);
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rdssl_md5_transform(md5, (char *)update_key, g_rc4_key_len);
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rdssl_md5_transform(md5, (char *)pad_92, 48);
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rdssl_md5_transform(md5, (char *)shasig, 20);
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rdssl_md5_complete(md5, (char *)key);
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rdssl_md5_info_delete(md5);
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update = rdssl_rc4_info_create();
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rdssl_rc4_set_key(update, (char *)key, g_rc4_key_len);
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rdssl_rc4_crypt(update, (char *)key, (char *)key, g_rc4_key_len);
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rdssl_rc4_info_delete(update);
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if (g_rc4_key_len == 8)
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sec_make_40bit(key);
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}
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/* Encrypt data using RC4 */
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static void
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sec_encrypt(uint8 * data, int length)
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{
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if (g_sec_encrypt_use_count == 4096)
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{
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sec_update(g_sec_encrypt_key, g_sec_encrypt_update_key);
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rdssl_rc4_set_key(g_rc4_encrypt_key, (char *)g_sec_encrypt_key, g_rc4_key_len);
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g_sec_encrypt_use_count = 0;
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}
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rdssl_rc4_crypt(g_rc4_encrypt_key, (char *)data, (char *)data, length);
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g_sec_encrypt_use_count++;
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}
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/* Decrypt data using RC4 */
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void
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sec_decrypt(uint8 * data, int length)
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{
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if (g_sec_decrypt_use_count == 4096)
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{
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sec_update(g_sec_decrypt_key, g_sec_decrypt_update_key);
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rdssl_rc4_set_key(g_rc4_decrypt_key, (char *)g_sec_decrypt_key, g_rc4_key_len);
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g_sec_decrypt_use_count = 0;
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}
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rdssl_rc4_crypt(g_rc4_decrypt_key,(char *)data, (char *)data, length);
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g_sec_decrypt_use_count++;
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}
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/* Perform an RSA public key encryption operation */
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static void
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sec_rsa_encrypt(uint8 * out, uint8 * in, int len, uint32 modulus_size, uint8 * modulus,
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uint8 * exponent)
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{
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rdssl_mod_exp((char *)out, 64, (char *)in, 32, (char *)modulus, 64, (char *)exponent, 4);
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}
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/* Initialise secure transport packet */
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STREAM
|
|
sec_init(uint32 flags, int maxlen)
|
|
{
|
|
int hdrlen;
|
|
STREAM s;
|
|
|
|
if (!g_licence_issued && !g_licence_error_result)
|
|
hdrlen = (flags & SEC_ENCRYPT) ? 12 : 4;
|
|
else
|
|
hdrlen = (flags & SEC_ENCRYPT) ? 12 : 0;
|
|
s = mcs_init(maxlen + hdrlen);
|
|
s_push_layer(s, sec_hdr, hdrlen);
|
|
|
|
return s;
|
|
}
|
|
|
|
/* Transmit secure transport packet over specified channel */
|
|
void
|
|
sec_send_to_channel(STREAM s, uint32 flags, uint16 channel)
|
|
{
|
|
int datalen;
|
|
|
|
#ifdef WITH_SCARD
|
|
scard_lock(SCARD_LOCK_SEC);
|
|
#endif
|
|
|
|
s_pop_layer(s, sec_hdr);
|
|
if ((!g_licence_issued && !g_licence_error_result) || (flags & SEC_ENCRYPT))
|
|
out_uint32_le(s, flags);
|
|
|
|
if (flags & SEC_ENCRYPT)
|
|
{
|
|
flags &= ~SEC_ENCRYPT;
|
|
datalen = s->end - s->p - 8;
|
|
|
|
#ifdef WITH_DEBUG
|
|
DEBUG(("Sending encrypted packet:\n"));
|
|
hexdump(s->p + 8, datalen);
|
|
#endif
|
|
|
|
sec_sign(s->p, 8, g_sec_sign_key, g_rc4_key_len, s->p + 8, datalen);
|
|
sec_encrypt(s->p + 8, datalen);
|
|
}
|
|
|
|
mcs_send_to_channel(s, channel);
|
|
|
|
#ifdef WITH_SCARD
|
|
scard_unlock(SCARD_LOCK_SEC);
|
|
#endif
|
|
}
|
|
|
|
/* Transmit secure transport packet */
|
|
|
|
void
|
|
sec_send(STREAM s, uint32 flags)
|
|
{
|
|
sec_send_to_channel(s, flags, MCS_GLOBAL_CHANNEL);
|
|
}
|
|
|
|
|
|
/* Transfer the client random to the server */
|
|
static void
|
|
sec_establish_key(void)
|
|
{
|
|
uint32 length = g_server_public_key_len + SEC_PADDING_SIZE;
|
|
uint32 flags = SEC_EXCHANGE_PKT;
|
|
STREAM s;
|
|
|
|
s = sec_init(flags, length + 4);
|
|
|
|
out_uint32_le(s, length);
|
|
out_uint8p(s, g_sec_crypted_random, g_server_public_key_len);
|
|
out_uint8s(s, SEC_PADDING_SIZE);
|
|
|
|
s_mark_end(s);
|
|
sec_send(s, flags);
|
|
}
|
|
|
|
/* Output connect initial data blob */
|
|
static void
|
|
sec_out_mcs_data(STREAM s, uint32 selected_protocol)
|
|
{
|
|
int hostlen = 2 * strlen(g_hostname);
|
|
int length = 162 + 76 + 12 + 4;
|
|
unsigned int i;
|
|
uint32 cluster_flags = 0;
|
|
|
|
if (g_num_channels > 0)
|
|
length += g_num_channels * 12 + 8;
|
|
|
|
if (hostlen > 30)
|
|
hostlen = 30;
|
|
|
|
/* Generic Conference Control (T.124) ConferenceCreateRequest */
|
|
out_uint16_be(s, 5);
|
|
out_uint16_be(s, 0x14);
|
|
out_uint8(s, 0x7c);
|
|
out_uint16_be(s, 1);
|
|
|
|
out_uint16_be(s, (length | 0x8000)); /* remaining length */
|
|
|
|
out_uint16_be(s, 8); /* length? */
|
|
out_uint16_be(s, 16);
|
|
out_uint8(s, 0);
|
|
out_uint16_le(s, 0xc001);
|
|
out_uint8(s, 0);
|
|
|
|
out_uint32_le(s, 0x61637544); /* OEM ID: "Duca", as in Ducati. */
|
|
out_uint16_be(s, ((length - 14) | 0x8000)); /* remaining length */
|
|
|
|
/* Client information */
|
|
out_uint16_le(s, SEC_TAG_CLI_INFO);
|
|
out_uint16_le(s, 216); /* length */
|
|
out_uint16_le(s, (g_rdp_version >= RDP_V5) ? 4 : 1); /* RDP version. 1 == RDP4, 4 >= RDP5 to RDP8 */
|
|
out_uint16_le(s, 8);
|
|
out_uint16_le(s, g_width);
|
|
out_uint16_le(s, g_height);
|
|
out_uint16_le(s, 0xca01);
|
|
out_uint16_le(s, 0xaa03);
|
|
out_uint32_le(s, g_keylayout);
|
|
out_uint32_le(s, 2600); /* Client build. We are now 2600 compatible :-) */
|
|
|
|
/* Unicode name of client, padded to 32 bytes */
|
|
rdp_out_unistr(s, g_hostname, hostlen);
|
|
out_uint8s(s, 30 - hostlen);
|
|
|
|
/* See
|
|
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wceddk40/html/cxtsksupportingremotedesktopprotocol.asp */
|
|
out_uint32_le(s, g_keyboard_type);
|
|
out_uint32_le(s, g_keyboard_subtype);
|
|
out_uint32_le(s, g_keyboard_functionkeys);
|
|
out_uint8s(s, 64); /* reserved? 4 + 12 doublewords */
|
|
out_uint16_le(s, 0xca01); /* colour depth? */
|
|
out_uint16_le(s, 1);
|
|
|
|
out_uint32(s, 0);
|
|
out_uint8(s, g_server_depth);
|
|
out_uint16_le(s, 0x0700);
|
|
out_uint8(s, 0);
|
|
out_uint32_le(s, 1);
|
|
out_uint8s(s, 64);
|
|
out_uint32_le(s, selected_protocol); /* End of client info */
|
|
|
|
/* Write a Client Cluster Data (TS_UD_CS_CLUSTER) */
|
|
out_uint16_le(s, SEC_TAG_CLI_CLUSTER); /* header.type */
|
|
out_uint16_le(s, 12); /* length */
|
|
|
|
cluster_flags |= SEC_CC_REDIRECTION_SUPPORTED;
|
|
cluster_flags |= (SEC_CC_REDIRECT_VERSION_3 << 2);
|
|
|
|
if (g_console_session || g_redirect_session_id != 0)
|
|
cluster_flags |= SEC_CC_REDIRECT_SESSIONID_FIELD_VALID;
|
|
|
|
out_uint32_le(s, cluster_flags);
|
|
out_uint32(s, g_redirect_session_id);
|
|
|
|
/* Client encryption settings */
|
|
out_uint16_le(s, SEC_TAG_CLI_CRYPT);
|
|
out_uint16_le(s, 12); /* length */
|
|
out_uint32_le(s, g_encryption ? 0x3 : 0); /* encryption supported, 128-bit supported */
|
|
out_uint32(s, 0); /* Unknown */
|
|
|
|
DEBUG_RDP5(("g_num_channels is %d\n", g_num_channels));
|
|
if (g_num_channels > 0)
|
|
{
|
|
out_uint16_le(s, SEC_TAG_CLI_CHANNELS);
|
|
out_uint16_le(s, g_num_channels * 12 + 8); /* length */
|
|
out_uint32_le(s, g_num_channels); /* number of virtual channels */
|
|
for (i = 0; i < g_num_channels; i++)
|
|
{
|
|
DEBUG_RDP5(("Requesting channel %s\n", g_channels[i].name));
|
|
out_uint8a(s, g_channels[i].name, 8);
|
|
out_uint32_be(s, g_channels[i].flags);
|
|
}
|
|
}
|
|
|
|
s_mark_end(s);
|
|
}
|
|
|
|
/* Parse a public key structure */
|
|
static RD_BOOL
|
|
sec_parse_public_key(STREAM s, uint8 * modulus, uint8 * exponent)
|
|
{
|
|
uint32 magic, modulus_len;
|
|
|
|
in_uint32_le(s, magic);
|
|
if (magic != SEC_RSA_MAGIC)
|
|
{
|
|
error("RSA magic 0x%x\n", magic);
|
|
return False;
|
|
}
|
|
|
|
in_uint32_le(s, modulus_len);
|
|
modulus_len -= SEC_PADDING_SIZE;
|
|
if ((modulus_len < SEC_MODULUS_SIZE) || (modulus_len > SEC_MAX_MODULUS_SIZE))
|
|
{
|
|
error("Bad server public key size (%u bits)\n", modulus_len * 8);
|
|
return False;
|
|
}
|
|
|
|
in_uint8s(s, 8); /* modulus_bits, unknown */
|
|
in_uint8a(s, exponent, SEC_EXPONENT_SIZE);
|
|
in_uint8a(s, modulus, modulus_len);
|
|
in_uint8s(s, SEC_PADDING_SIZE);
|
|
g_server_public_key_len = modulus_len;
|
|
|
|
return s_check(s);
|
|
}
|
|
|
|
/* Parse a public signature structure */
|
|
static RD_BOOL
|
|
sec_parse_public_sig(STREAM s, uint32 len, uint8 * modulus, uint8 * exponent)
|
|
{
|
|
uint8 signature[SEC_MAX_MODULUS_SIZE];
|
|
uint8 signature_[SEC_MAX_MODULUS_SIZE];
|
|
uint32 sig_len;
|
|
|
|
if (len != 72)
|
|
{
|
|
return True;
|
|
}
|
|
memset(signature, 0, sizeof(signature));
|
|
sig_len = len - 8;
|
|
in_uint8a(s, signature, sig_len);
|
|
if(rdssl_sign_ok((char *)exponent, SEC_EXPONENT_SIZE, (char *)modulus, g_server_public_key_len,
|
|
(char *)signature_, SEC_MODULUS_SIZE, (char *)signature, sig_len, (char *)g_testkey))
|
|
{
|
|
DEBUG_RDP5(("key signature doesn't match test key\n"));
|
|
}
|
|
return s_check(s);
|
|
}
|
|
|
|
/* Parse a crypto information structure */
|
|
static RD_BOOL
|
|
sec_parse_crypt_info(STREAM s, uint32 * rc4_key_size,
|
|
uint8 ** server_random, uint8 * modulus, uint8 * exponent)
|
|
{
|
|
uint32 crypt_level, random_len, rsa_info_len;
|
|
uint32 cacert_len, cert_len, flags;
|
|
PCCERT_CONTEXT cacert, server_cert;
|
|
BYTE *server_public_key;
|
|
uint16 tag, length;
|
|
uint8 *next_tag, *end;
|
|
|
|
in_uint32_le(s, *rc4_key_size); /* 1 = 40-bit, 2 = 128-bit */
|
|
in_uint32_le(s, crypt_level); /* 1 = low, 2 = medium, 3 = high */
|
|
if (crypt_level == 0)
|
|
{
|
|
/* no encryption */
|
|
return False;
|
|
}
|
|
|
|
in_uint32_le(s, random_len);
|
|
in_uint32_le(s, rsa_info_len);
|
|
|
|
if (random_len != SEC_RANDOM_SIZE)
|
|
{
|
|
error("random len %d, expected %d\n", random_len, SEC_RANDOM_SIZE);
|
|
return False;
|
|
}
|
|
|
|
in_uint8p(s, *server_random, random_len);
|
|
|
|
/* RSA info */
|
|
end = s->p + rsa_info_len;
|
|
if (end > s->end)
|
|
return False;
|
|
|
|
in_uint32_le(s, flags); /* 1 = RDP4-style, 0x80000002 = X.509 */
|
|
if (flags & 1)
|
|
{
|
|
DEBUG_RDP5(("We're going for the RDP4-style encryption\n"));
|
|
in_uint8s(s, 8); /* unknown */
|
|
|
|
while (s->p < end)
|
|
{
|
|
in_uint16_le(s, tag);
|
|
in_uint16_le(s, length);
|
|
|
|
next_tag = s->p + length;
|
|
|
|
switch (tag)
|
|
{
|
|
case SEC_TAG_PUBKEY:
|
|
if (!sec_parse_public_key(s, modulus, exponent))
|
|
return False;
|
|
DEBUG_RDP5(("Got Public key, RDP4-style\n"));
|
|
|
|
break;
|
|
|
|
case SEC_TAG_KEYSIG:
|
|
if (!sec_parse_public_sig(s, length, modulus, exponent))
|
|
return False;
|
|
break;
|
|
|
|
default:
|
|
unimpl("crypt tag 0x%x\n", tag);
|
|
}
|
|
|
|
s->p = next_tag;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
uint32 certcount;
|
|
|
|
DEBUG_RDP5(("We're going for the RDP5-style encryption\n"));
|
|
in_uint32_le(s, certcount); /* Number of certificates */
|
|
if (certcount < 2)
|
|
{
|
|
error("Server didn't send enough X509 certificates\n");
|
|
return False;
|
|
}
|
|
for (; certcount > 2; certcount--)
|
|
{ /* ignore all the certificates between the root and the signing CA */
|
|
uint32 ignorelen;
|
|
PCCERT_CONTEXT ignorecert;
|
|
|
|
DEBUG_RDP5(("Ignored certs left: %d\n", certcount));
|
|
in_uint32_le(s, ignorelen);
|
|
DEBUG_RDP5(("Ignored Certificate length is %d\n", ignorelen));
|
|
ignorecert = rdssl_cert_read(s->p, ignorelen);
|
|
in_uint8s(s, ignorelen);
|
|
if (ignorecert == NULL)
|
|
{ /* XXX: error out? */
|
|
DEBUG_RDP5(("got a bad cert: this will probably screw up the rest of the communication\n"));
|
|
}
|
|
|
|
#ifdef WITH_DEBUG_RDP5
|
|
DEBUG_RDP5(("cert #%d (ignored):\n", certcount));
|
|
rdssl_cert_print_fp(stdout, ignorecert);
|
|
#endif
|
|
}
|
|
/* Do da funky X.509 stuffy
|
|
|
|
"How did I find out about this? I looked up and saw a
|
|
bright light and when I came to I had a scar on my forehead
|
|
and knew about X.500"
|
|
- Peter Gutman in a early version of
|
|
http://www.cs.auckland.ac.nz/~pgut001/pubs/x509guide.txt
|
|
*/
|
|
in_uint32_le(s, cacert_len);
|
|
DEBUG_RDP5(("CA Certificate length is %d\n", cacert_len));
|
|
cacert = rdssl_cert_read(s->p, cacert_len);
|
|
in_uint8s(s, cacert_len);
|
|
if (NULL == cacert)
|
|
{
|
|
error("Couldn't load CA Certificate from server\n");
|
|
return False;
|
|
}
|
|
in_uint32_le(s, cert_len);
|
|
DEBUG_RDP5(("Certificate length is %d\n", cert_len));
|
|
server_cert = rdssl_cert_read(s->p, cert_len);
|
|
in_uint8s(s, cert_len);
|
|
if (NULL == server_cert)
|
|
{
|
|
rdssl_cert_free(cacert);
|
|
error("Couldn't load Certificate from server\n");
|
|
return False;
|
|
}
|
|
if (!rdssl_certs_ok(server_cert, cacert))
|
|
{
|
|
rdssl_cert_free(server_cert);
|
|
rdssl_cert_free(cacert);
|
|
error("Security error CA Certificate invalid\n");
|
|
return False;
|
|
}
|
|
rdssl_cert_free(cacert);
|
|
in_uint8s(s, 16); /* Padding */
|
|
server_public_key = rdssl_cert_to_rkey(server_cert, &g_server_public_key_len);
|
|
if (NULL == server_public_key)
|
|
{
|
|
DEBUG_RDP5(("Didn't parse X509 correctly\n"));
|
|
rdssl_cert_free(server_cert);
|
|
return False;
|
|
}
|
|
rdssl_cert_free(server_cert);
|
|
if ((g_server_public_key_len < SEC_MODULUS_SIZE) ||
|
|
(g_server_public_key_len > SEC_MAX_MODULUS_SIZE))
|
|
{
|
|
error("Bad server public key size (%u bits)\n",
|
|
g_server_public_key_len * 8);
|
|
rdssl_rkey_free(server_public_key);
|
|
return False;
|
|
}
|
|
if (rdssl_rkey_get_exp_mod(server_public_key, exponent, SEC_EXPONENT_SIZE,
|
|
modulus, SEC_MAX_MODULUS_SIZE) != 0)
|
|
{
|
|
error("Problem extracting RSA exponent, modulus");
|
|
rdssl_rkey_free(server_public_key);
|
|
return False;
|
|
}
|
|
rdssl_rkey_free(server_public_key);
|
|
return True; /* There's some garbage here we don't care about */
|
|
}
|
|
return s_check_end(s);
|
|
}
|
|
|
|
/* Process crypto information blob */
|
|
static void
|
|
sec_process_crypt_info(STREAM s)
|
|
{
|
|
uint8 *server_random = NULL;
|
|
uint8 modulus[SEC_MAX_MODULUS_SIZE];
|
|
uint8 exponent[SEC_EXPONENT_SIZE];
|
|
uint32 rc4_key_size;
|
|
|
|
memset(modulus, 0, sizeof(modulus));
|
|
memset(exponent, 0, sizeof(exponent));
|
|
if (!sec_parse_crypt_info(s, &rc4_key_size, &server_random, modulus, exponent))
|
|
{
|
|
DEBUG(("Failed to parse crypt info\n"));
|
|
return;
|
|
}
|
|
DEBUG(("Generating client random\n"));
|
|
generate_random(g_client_random);
|
|
sec_rsa_encrypt(g_sec_crypted_random, g_client_random, SEC_RANDOM_SIZE,
|
|
g_server_public_key_len, modulus, exponent);
|
|
sec_generate_keys(g_client_random, server_random, rc4_key_size);
|
|
}
|
|
|
|
|
|
/* Process SRV_INFO, find RDP version supported by server */
|
|
static void
|
|
sec_process_srv_info(STREAM s)
|
|
{
|
|
in_uint16_le(s, g_server_rdp_version);
|
|
DEBUG_RDP5(("Server RDP version is %d\n", g_server_rdp_version));
|
|
if (1 == g_server_rdp_version)
|
|
{
|
|
g_rdp_version = RDP_V4;
|
|
g_server_depth = 8;
|
|
}
|
|
}
|
|
|
|
|
|
/* Process connect response data blob */
|
|
void
|
|
sec_process_mcs_data(STREAM s)
|
|
{
|
|
uint16 tag, length;
|
|
uint8 *next_tag;
|
|
uint8 len;
|
|
|
|
in_uint8s(s, 21); /* header (T.124 ConferenceCreateResponse) */
|
|
in_uint8(s, len);
|
|
if (len & 0x80)
|
|
in_uint8(s, len);
|
|
|
|
while (s->p < s->end)
|
|
{
|
|
in_uint16_le(s, tag);
|
|
in_uint16_le(s, length);
|
|
|
|
if (length <= 4)
|
|
return;
|
|
|
|
next_tag = s->p + length - 4;
|
|
|
|
switch (tag)
|
|
{
|
|
case SEC_TAG_SRV_INFO:
|
|
sec_process_srv_info(s);
|
|
break;
|
|
|
|
case SEC_TAG_SRV_CRYPT:
|
|
sec_process_crypt_info(s);
|
|
break;
|
|
|
|
case SEC_TAG_SRV_CHANNELS:
|
|
/* FIXME: We should parse this information and
|
|
use it to map RDP5 channels to MCS
|
|
channels */
|
|
break;
|
|
|
|
default:
|
|
unimpl("response tag 0x%x\n", tag);
|
|
}
|
|
|
|
s->p = next_tag;
|
|
}
|
|
}
|
|
|
|
/* Receive secure transport packet */
|
|
STREAM
|
|
sec_recv(uint8 * rdpver)
|
|
{
|
|
uint16 sec_flags;
|
|
/* uint16 sec_flags_hi; */
|
|
uint16 channel;
|
|
STREAM s;
|
|
|
|
while ((s = mcs_recv(&channel, rdpver)) != NULL)
|
|
{
|
|
if (rdpver != NULL)
|
|
{
|
|
if (*rdpver != 3)
|
|
{
|
|
if (*rdpver & 0x80)
|
|
{
|
|
in_uint8s(s, 8); /* signature */
|
|
sec_decrypt(s->p, s->end - s->p);
|
|
}
|
|
return s;
|
|
}
|
|
}
|
|
if (g_encryption || (!g_licence_issued && !g_licence_error_result))
|
|
{
|
|
/* TS_SECURITY_HEADER */
|
|
in_uint16_le(s, sec_flags);
|
|
in_uint8s(s, 2); /* sec_flags_hi */
|
|
|
|
if (g_encryption)
|
|
{
|
|
if (sec_flags & SEC_ENCRYPT)
|
|
{
|
|
in_uint8s(s, 8); /* signature */
|
|
sec_decrypt(s->p, s->end - s->p);
|
|
}
|
|
|
|
if (sec_flags & SEC_LICENSE_PKT)
|
|
{
|
|
licence_process(s);
|
|
continue;
|
|
}
|
|
|
|
if (sec_flags & SEC_REDIRECTION_PKT) /* SEC_REDIRECT_ENCRYPT */
|
|
{
|
|
uint8 swapbyte;
|
|
|
|
in_uint8s(s, 8); /* signature */
|
|
sec_decrypt(s->p, s->end - s->p);
|
|
|
|
/* Check for a redirect packet, starts with 00 04 */
|
|
if (s->p[0] == 0 && s->p[1] == 4)
|
|
{
|
|
/* for some reason the PDU and the length seem to be swapped.
|
|
This isn't good, but we're going to do a byte for byte
|
|
swap. So the first four values appear as: 00 04 XX YY,
|
|
where XX YY is the little endian length. We're going to
|
|
use 04 00 as the PDU type, so after our swap this will look
|
|
like: XX YY 04 00 */
|
|
swapbyte = s->p[0];
|
|
s->p[0] = s->p[2];
|
|
s->p[2] = swapbyte;
|
|
|
|
swapbyte = s->p[1];
|
|
s->p[1] = s->p[3];
|
|
s->p[3] = swapbyte;
|
|
|
|
swapbyte = s->p[2];
|
|
s->p[2] = s->p[3];
|
|
s->p[3] = swapbyte;
|
|
}
|
|
#ifdef WITH_DEBUG
|
|
/* warning! this debug statement will show passwords in the clear! */
|
|
hexdump(s->p, s->end - s->p);
|
|
#endif
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (sec_flags & SEC_LICENSE_PKT)
|
|
{
|
|
licence_process(s);
|
|
continue;
|
|
}
|
|
s->p -= 4;
|
|
}
|
|
}
|
|
|
|
if (channel != MCS_GLOBAL_CHANNEL)
|
|
{
|
|
channel_process(s, channel);
|
|
if (rdpver != NULL)
|
|
*rdpver = 0xff;
|
|
return s;
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Establish a secure connection */
|
|
RD_BOOL
|
|
sec_connect(char *server, char *username, char *domain, char *password, RD_BOOL reconnect)
|
|
{
|
|
uint32 selected_proto;
|
|
struct stream mcs_data;
|
|
|
|
/* Start a MCS connect sequence */
|
|
if (!mcs_connect_start(server, username, domain, password, reconnect, &selected_proto))
|
|
return False;
|
|
|
|
/* We exchange some RDP data during the MCS-Connect */
|
|
mcs_data.size = 512;
|
|
mcs_data.p = mcs_data.data = (uint8 *) xmalloc(mcs_data.size);
|
|
sec_out_mcs_data(&mcs_data, selected_proto);
|
|
|
|
/* finalize the MCS connect sequence */
|
|
if (!mcs_connect_finalize(&mcs_data))
|
|
return False;
|
|
|
|
/* sec_process_mcs_data(&mcs_data); */
|
|
if (g_encryption)
|
|
sec_establish_key();
|
|
xfree(mcs_data.data);
|
|
return True;
|
|
}
|
|
|
|
/* Disconnect a connection */
|
|
void
|
|
sec_disconnect(void)
|
|
{
|
|
mcs_disconnect();
|
|
}
|
|
|
|
/* reset the state of the sec layer */
|
|
void
|
|
sec_reset_state(void)
|
|
{
|
|
g_server_rdp_version = 0;
|
|
g_sec_encrypt_use_count = 0;
|
|
g_sec_decrypt_use_count = 0;
|
|
g_licence_issued = 0;
|
|
g_licence_error_result = 0;
|
|
mcs_reset_state();
|
|
}
|