2000-08-15 12:23:24 +02:00
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/*
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rdesktop: A Remote Desktop Protocol client.
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Protocol services - RDP encryption and licensing
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2001-09-14 15:51:38 +02:00
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Copyright (C) Matthew Chapman 1999-2001
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2000-08-15 12:23:24 +02:00
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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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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, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "rdesktop.h"
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2001-09-15 11:37:17 +02:00
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#ifdef WITH_OPENSSL
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#include <openssl/rc4.h>
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#include <openssl/md5.h>
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#include <openssl/sha.h>
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#include <openssl/bn.h>
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#else
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2000-08-15 12:23:24 +02:00
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#include "crypto/rc4.h"
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#include "crypto/md5.h"
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#include "crypto/sha.h"
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2001-09-15 11:37:17 +02:00
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#include "crypto/bn.h"
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#endif
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2000-08-15 12:23:24 +02:00
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extern char hostname[16];
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extern int width;
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extern int height;
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extern int keylayout;
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2001-09-14 15:51:38 +02:00
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extern BOOL encryption;
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2001-06-20 15:54:48 +02:00
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extern BOOL licence_issued;
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2000-08-15 12:23:24 +02:00
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static int rc4_key_len;
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static RC4_KEY rc4_decrypt_key;
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static RC4_KEY rc4_encrypt_key;
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2002-07-13 04:30:49 +02:00
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static uint8 sec_sign_key[16];
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2000-08-15 12:23:24 +02:00
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static uint8 sec_decrypt_key[16];
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static uint8 sec_encrypt_key[16];
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2002-07-13 04:30:49 +02:00
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static uint8 sec_decrypt_update_key[16];
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static uint8 sec_encrypt_update_key[16];
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static uint8 sec_crypted_random[SEC_MODULUS_SIZE];
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2000-08-15 12:23:24 +02:00
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/*
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* General purpose 48-byte transformation, using two 32-byte salts (generally,
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* a client and server salt) and a global salt value used for padding.
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* Both SHA1 and MD5 algorithms are used.
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*/
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2001-01-06 04:47:04 +01:00
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void
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2002-07-18 18:38:31 +02:00
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sec_hash_48(uint8 * out, uint8 * in, uint8 * salt1, uint8 * salt2, uint8 salt)
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2000-08-15 12:23:24 +02:00
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{
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uint8 shasig[20];
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uint8 pad[4];
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SHA_CTX sha;
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MD5_CTX 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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2001-01-06 04:12:10 +01:00
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memset(pad, salt + i, i + 1);
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2000-08-15 12:23:24 +02:00
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SHA1_Init(&sha);
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2001-01-06 04:12:10 +01:00
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SHA1_Update(&sha, pad, i + 1);
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2000-08-15 12:23:24 +02:00
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SHA1_Update(&sha, in, 48);
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SHA1_Update(&sha, salt1, 32);
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SHA1_Update(&sha, salt2, 32);
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SHA1_Final(shasig, &sha);
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MD5_Init(&md5);
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MD5_Update(&md5, in, 48);
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MD5_Update(&md5, shasig, 20);
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2001-01-06 04:12:10 +01:00
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MD5_Final(&out[i * 16], &md5);
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2000-08-15 12:23:24 +02:00
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}
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}
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/*
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* Weaker 16-byte transformation, also using two 32-byte salts, but
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* only using a single round of MD5.
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*/
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2001-01-06 04:47:04 +01:00
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void
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2002-07-18 18:38:31 +02:00
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sec_hash_16(uint8 * out, uint8 * in, uint8 * salt1, uint8 * salt2)
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2000-08-15 12:23:24 +02:00
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{
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MD5_CTX md5;
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MD5_Init(&md5);
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MD5_Update(&md5, in, 16);
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MD5_Update(&md5, salt1, 32);
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MD5_Update(&md5, salt2, 32);
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MD5_Final(out, &md5);
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}
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/* Reduce key entropy from 64 to 40 bits */
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2001-01-06 04:47:04 +01:00
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static void
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2002-07-18 18:38:31 +02:00
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sec_make_40bit(uint8 * key)
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2000-08-15 12:23:24 +02:00
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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 a session key and RC4 keys, given client and server randoms */
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2001-01-06 04:47:04 +01:00
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static void
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2002-07-18 18:38:31 +02:00
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sec_generate_keys(uint8 * client_key, uint8 * server_key, int rc4_key_size)
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2000-08-15 12:23:24 +02:00
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{
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uint8 session_key[48];
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uint8 temp_hash[48];
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uint8 input[48];
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/* Construct input data to hash */
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2001-01-06 04:12:10 +01:00
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memcpy(input, client_key, 24);
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memcpy(input + 24, server_key, 24);
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2000-08-15 12:23:24 +02:00
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/* Generate session key - two rounds of sec_hash_48 */
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2001-01-06 04:12:10 +01:00
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sec_hash_48(temp_hash, input, client_key, server_key, 65);
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2000-08-15 12:23:24 +02:00
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sec_hash_48(session_key, temp_hash, client_key, server_key, 88);
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2002-07-13 04:30:49 +02:00
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/* Store first 16 bytes of session key, for generating signatures */
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memcpy(sec_sign_key, session_key, 16);
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2000-08-15 12:23:24 +02:00
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/* Generate RC4 keys */
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2002-07-30 09:18:48 +02:00
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sec_hash_16(sec_decrypt_key, &session_key[16], client_key, server_key);
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sec_hash_16(sec_encrypt_key, &session_key[32], client_key, server_key);
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2000-08-15 12:23:24 +02:00
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if (rc4_key_size == 1)
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{
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2001-09-14 15:51:38 +02:00
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DEBUG(("40-bit encryption enabled\n"));
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2000-08-15 12:23:24 +02:00
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sec_make_40bit(sec_sign_key);
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sec_make_40bit(sec_decrypt_key);
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sec_make_40bit(sec_encrypt_key);
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rc4_key_len = 8;
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}
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else
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{
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2001-09-14 15:51:38 +02:00
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DEBUG(("128-bit encryption enabled\n"));
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2000-08-15 12:23:24 +02:00
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rc4_key_len = 16;
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}
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2002-07-13 04:30:49 +02:00
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/* Save initial RC4 keys as update keys */
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memcpy(sec_decrypt_update_key, sec_decrypt_key, 16);
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memcpy(sec_encrypt_update_key, sec_encrypt_key, 16);
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2000-08-15 12:23:24 +02:00
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/* Initialise RC4 state arrays */
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RC4_set_key(&rc4_decrypt_key, rc4_key_len, sec_decrypt_key);
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RC4_set_key(&rc4_encrypt_key, rc4_key_len, sec_encrypt_key);
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}
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2001-01-06 04:12:10 +01:00
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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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2001-01-06 04:47:04 +01:00
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54, 54, 54,
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2001-01-06 04:12:10 +01:00
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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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2001-01-06 04:47:04 +01:00
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54, 54, 54
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2000-08-15 12:23:24 +02:00
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};
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2001-01-06 04:12:10 +01:00
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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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2001-01-06 04:47:04 +01:00
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92, 92, 92, 92, 92, 92, 92,
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2001-01-06 04:12:10 +01:00
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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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2001-01-06 04:47:04 +01:00
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92, 92, 92, 92, 92, 92, 92
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2000-08-15 12:23:24 +02:00
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};
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/* Output a uint32 into a buffer (little-endian) */
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2001-01-06 04:47:04 +01:00
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void
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2002-07-18 18:38:31 +02:00
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buf_out_uint32(uint8 * buffer, uint32 value)
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2000-08-15 12:23:24 +02:00
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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 signature hash, using a combination of SHA1 and MD5 */
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2001-01-06 04:47:04 +01:00
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void
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2002-07-30 09:18:48 +02:00
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sec_sign(uint8 * signature, int siglen, uint8 * session_key, int keylen, uint8 * data, int datalen)
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2000-08-15 12:23:24 +02:00
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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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SHA_CTX sha;
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MD5_CTX md5;
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2001-01-06 04:12:10 +01:00
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buf_out_uint32(lenhdr, datalen);
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2000-08-15 12:23:24 +02:00
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SHA1_Init(&sha);
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2002-07-14 14:06:03 +02:00
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SHA1_Update(&sha, session_key, keylen);
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2000-08-15 12:23:24 +02:00
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SHA1_Update(&sha, pad_54, 40);
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SHA1_Update(&sha, lenhdr, 4);
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SHA1_Update(&sha, data, datalen);
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SHA1_Final(shasig, &sha);
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MD5_Init(&md5);
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2002-07-14 14:06:03 +02:00
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MD5_Update(&md5, session_key, keylen);
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2000-08-15 12:23:24 +02:00
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MD5_Update(&md5, pad_92, 48);
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MD5_Update(&md5, shasig, 20);
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MD5_Final(md5sig, &md5);
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2002-07-14 14:06:03 +02:00
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memcpy(signature, md5sig, siglen);
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2000-08-15 12:23:24 +02:00
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}
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/* Update an encryption key - similar to the signing process */
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2001-01-06 04:47:04 +01:00
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static void
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2002-07-18 18:38:31 +02:00
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sec_update(uint8 * key, uint8 * update_key)
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2000-08-15 12:23:24 +02:00
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{
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uint8 shasig[20];
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SHA_CTX sha;
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MD5_CTX md5;
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RC4_KEY update;
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SHA1_Init(&sha);
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2002-07-13 04:30:49 +02:00
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SHA1_Update(&sha, update_key, rc4_key_len);
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2000-08-15 12:23:24 +02:00
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SHA1_Update(&sha, pad_54, 40);
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2002-07-13 04:30:49 +02:00
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SHA1_Update(&sha, key, rc4_key_len);
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2000-08-15 12:23:24 +02:00
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SHA1_Final(shasig, &sha);
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MD5_Init(&md5);
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2002-07-13 04:30:49 +02:00
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MD5_Update(&md5, update_key, rc4_key_len);
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2000-08-15 12:23:24 +02:00
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MD5_Update(&md5, pad_92, 48);
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MD5_Update(&md5, shasig, 20);
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MD5_Final(key, &md5);
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RC4_set_key(&update, rc4_key_len, key);
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RC4(&update, rc4_key_len, key, key);
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if (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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2001-01-06 04:47:04 +01:00
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static void
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2002-07-18 18:38:31 +02:00
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sec_encrypt(uint8 * data, int length)
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2000-08-15 12:23:24 +02:00
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{
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static int use_count;
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if (use_count == 4096)
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{
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sec_update(sec_encrypt_key, sec_encrypt_update_key);
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RC4_set_key(&rc4_encrypt_key, rc4_key_len, sec_encrypt_key);
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use_count = 0;
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}
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RC4(&rc4_encrypt_key, length, data, data);
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use_count++;
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}
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/* Decrypt data using RC4 */
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2001-01-06 04:47:04 +01:00
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static void
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2002-07-18 18:38:31 +02:00
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sec_decrypt(uint8 * data, int length)
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2000-08-15 12:23:24 +02:00
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{
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static int use_count;
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if (use_count == 4096)
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{
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sec_update(sec_decrypt_key, sec_decrypt_update_key);
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RC4_set_key(&rc4_decrypt_key, rc4_key_len, sec_decrypt_key);
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use_count = 0;
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}
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RC4(&rc4_decrypt_key, length, data, data);
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use_count++;
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}
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2001-01-06 04:47:04 +01:00
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static void
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2002-07-18 18:38:31 +02:00
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reverse(uint8 * p, int len)
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2000-08-15 12:23:24 +02:00
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{
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int i, j;
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2001-09-15 11:37:17 +02:00
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uint8 temp;
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2000-08-15 12:23:24 +02:00
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2002-07-18 18:38:31 +02:00
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for (i = 0, j = len - 1; i < j; i++, j--)
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2000-08-15 12:23:24 +02:00
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{
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2001-09-15 11:37:17 +02:00
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temp = p[i];
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p[i] = p[j];
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p[j] = temp;
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2000-08-15 12:23:24 +02:00
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}
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}
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/* Perform an RSA public key encryption operation */
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2001-01-06 04:47:04 +01:00
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static void
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2002-07-30 09:18:48 +02:00
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sec_rsa_encrypt(uint8 * out, uint8 * in, int len, uint8 * modulus, uint8 * exponent)
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2000-08-15 12:23:24 +02:00
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{
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2001-09-15 11:37:17 +02:00
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BN_CTX ctx;
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BIGNUM mod, exp, x, y;
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uint8 inr[SEC_MODULUS_SIZE];
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int outlen;
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reverse(modulus, SEC_MODULUS_SIZE);
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reverse(exponent, SEC_EXPONENT_SIZE);
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memcpy(inr, in, len);
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reverse(inr, len);
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BN_CTX_init(&ctx);
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BN_init(&mod);
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|
BN_init(&exp);
|
|
|
|
BN_init(&x);
|
|
|
|
BN_init(&y);
|
|
|
|
|
|
|
|
BN_bin2bn(modulus, SEC_MODULUS_SIZE, &mod);
|
|
|
|
BN_bin2bn(exponent, SEC_EXPONENT_SIZE, &exp);
|
|
|
|
BN_bin2bn(inr, len, &x);
|
|
|
|
BN_mod_exp(&y, &x, &exp, &mod, &ctx);
|
|
|
|
outlen = BN_bn2bin(&y, out);
|
|
|
|
reverse(out, outlen);
|
|
|
|
if (outlen < SEC_MODULUS_SIZE)
|
2002-07-18 18:38:31 +02:00
|
|
|
memset(out + outlen, 0, SEC_MODULUS_SIZE - outlen);
|
2001-09-15 11:37:17 +02:00
|
|
|
|
|
|
|
BN_free(&y);
|
|
|
|
BN_clear_free(&x);
|
|
|
|
BN_free(&exp);
|
|
|
|
BN_free(&mod);
|
|
|
|
BN_CTX_free(&ctx);
|
2000-08-15 12:23:24 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Initialise secure transport packet */
|
2001-01-06 04:47:04 +01:00
|
|
|
STREAM
|
|
|
|
sec_init(uint32 flags, int maxlen)
|
2000-08-15 12:23:24 +02:00
|
|
|
{
|
|
|
|
int hdrlen;
|
|
|
|
STREAM s;
|
|
|
|
|
2001-06-20 15:54:48 +02:00
|
|
|
if (!licence_issued)
|
|
|
|
hdrlen = (flags & SEC_ENCRYPT) ? 12 : 4;
|
|
|
|
else
|
|
|
|
hdrlen = (flags & SEC_ENCRYPT) ? 12 : 0;
|
2001-01-06 04:12:10 +01:00
|
|
|
s = mcs_init(maxlen + hdrlen);
|
2000-08-15 12:23:24 +02:00
|
|
|
s_push_layer(s, sec_hdr, hdrlen);
|
|
|
|
|
|
|
|
return s;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Transmit secure transport packet */
|
2001-01-06 04:47:04 +01:00
|
|
|
void
|
|
|
|
sec_send(STREAM s, uint32 flags)
|
2000-08-15 12:23:24 +02:00
|
|
|
{
|
|
|
|
int datalen;
|
|
|
|
|
|
|
|
s_pop_layer(s, sec_hdr);
|
2001-06-20 15:54:48 +02:00
|
|
|
if (!licence_issued || (flags & SEC_ENCRYPT))
|
|
|
|
out_uint32_le(s, flags);
|
2000-08-15 12:23:24 +02:00
|
|
|
|
|
|
|
if (flags & SEC_ENCRYPT)
|
|
|
|
{
|
|
|
|
flags &= ~SEC_ENCRYPT;
|
|
|
|
datalen = s->end - s->p - 8;
|
|
|
|
|
2001-09-14 15:51:38 +02:00
|
|
|
#if WITH_DEBUG
|
|
|
|
DEBUG(("Sending encrypted packet:\n"));
|
2001-01-06 04:12:10 +01:00
|
|
|
hexdump(s->p + 8, datalen);
|
2000-08-15 12:23:24 +02:00
|
|
|
#endif
|
|
|
|
|
2002-07-30 09:18:48 +02:00
|
|
|
sec_sign(s->p, 8, sec_sign_key, rc4_key_len, s->p + 8, datalen);
|
2001-01-06 04:12:10 +01:00
|
|
|
sec_encrypt(s->p + 8, datalen);
|
2000-08-15 12:23:24 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
mcs_send(s);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Transfer the client random to the server */
|
2001-01-06 04:47:04 +01:00
|
|
|
static void
|
|
|
|
sec_establish_key()
|
2000-08-15 12:23:24 +02:00
|
|
|
{
|
|
|
|
uint32 length = SEC_MODULUS_SIZE + SEC_PADDING_SIZE;
|
|
|
|
uint32 flags = SEC_CLIENT_RANDOM;
|
|
|
|
STREAM s;
|
|
|
|
|
|
|
|
s = sec_init(flags, 76);
|
|
|
|
|
|
|
|
out_uint32_le(s, length);
|
|
|
|
out_uint8p(s, sec_crypted_random, SEC_MODULUS_SIZE);
|
|
|
|
out_uint8s(s, SEC_PADDING_SIZE);
|
|
|
|
|
|
|
|
s_mark_end(s);
|
|
|
|
sec_send(s, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Output connect initial data blob */
|
2001-01-06 04:47:04 +01:00
|
|
|
static void
|
|
|
|
sec_out_mcs_data(STREAM s)
|
2000-08-15 12:23:24 +02:00
|
|
|
{
|
|
|
|
int hostlen = 2 * strlen(hostname);
|
2002-08-26 19:12:43 +02:00
|
|
|
|
2002-08-04 04:48:08 +02:00
|
|
|
if (hostlen > 30)
|
|
|
|
hostlen = 30;
|
2000-08-15 12:23:24 +02:00
|
|
|
|
|
|
|
out_uint16_be(s, 5); /* unknown */
|
|
|
|
out_uint16_be(s, 0x14);
|
|
|
|
out_uint8(s, 0x7c);
|
|
|
|
out_uint16_be(s, 1);
|
|
|
|
|
2001-01-06 04:12:10 +01:00
|
|
|
out_uint16_be(s, (158 | 0x8000)); /* remaining length */
|
2000-08-15 12:23:24 +02:00
|
|
|
|
|
|
|
out_uint16_be(s, 8); /* length? */
|
|
|
|
out_uint16_be(s, 16);
|
|
|
|
out_uint8(s, 0);
|
|
|
|
out_uint16_le(s, 0xc001);
|
|
|
|
out_uint8(s, 0);
|
|
|
|
|
2001-01-06 04:12:10 +01:00
|
|
|
out_uint32_le(s, 0x61637544); /* "Duca" ?! */
|
|
|
|
out_uint16_be(s, (144 | 0x8000)); /* remaining length */
|
2000-08-15 12:23:24 +02:00
|
|
|
|
|
|
|
/* Client information */
|
|
|
|
out_uint16_le(s, SEC_TAG_CLI_INFO);
|
|
|
|
out_uint16_le(s, 136); /* length */
|
|
|
|
out_uint16_le(s, 1);
|
|
|
|
out_uint16_le(s, 8);
|
|
|
|
out_uint16_le(s, width);
|
|
|
|
out_uint16_le(s, height);
|
|
|
|
out_uint16_le(s, 0xca01);
|
|
|
|
out_uint16_le(s, 0xaa03);
|
|
|
|
out_uint32_le(s, keylayout);
|
2001-01-06 04:12:10 +01:00
|
|
|
out_uint32_le(s, 419); /* client build? we are 419 compatible :-) */
|
2000-08-15 12:23:24 +02:00
|
|
|
|
|
|
|
/* Unicode name of client, padded to 32 bytes */
|
|
|
|
rdp_out_unistr(s, hostname, hostlen);
|
2001-01-06 04:12:10 +01:00
|
|
|
out_uint8s(s, 30 - hostlen);
|
2000-08-15 12:23:24 +02:00
|
|
|
|
|
|
|
out_uint32_le(s, 4);
|
|
|
|
out_uint32(s, 0);
|
|
|
|
out_uint32_le(s, 12);
|
2001-01-06 04:12:10 +01:00
|
|
|
out_uint8s(s, 64); /* reserved? 4 + 12 doublewords */
|
2000-08-15 12:23:24 +02:00
|
|
|
|
2002-09-17 11:55:03 +02:00
|
|
|
out_uint16_le(s, 0xca01);
|
2000-08-15 12:23:24 +02:00
|
|
|
out_uint16(s, 0);
|
|
|
|
|
|
|
|
/* Client encryption settings */
|
|
|
|
out_uint16_le(s, SEC_TAG_CLI_CRYPT);
|
2002-09-17 11:55:03 +02:00
|
|
|
out_uint16_le(s, 8); /* length */
|
2002-07-13 04:30:49 +02:00
|
|
|
out_uint32_le(s, encryption ? 0x3 : 0); /* encryption supported, 128-bit supported */
|
2000-08-15 12:23:24 +02:00
|
|
|
s_mark_end(s);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Parse a public key structure */
|
2001-01-06 04:47:04 +01:00
|
|
|
static BOOL
|
2002-07-18 18:38:31 +02:00
|
|
|
sec_parse_public_key(STREAM s, uint8 ** modulus, uint8 ** exponent)
|
2000-08-15 12:23:24 +02:00
|
|
|
{
|
|
|
|
uint32 magic, modulus_len;
|
|
|
|
|
|
|
|
in_uint32_le(s, magic);
|
|
|
|
if (magic != SEC_RSA_MAGIC)
|
|
|
|
{
|
2001-09-14 15:51:38 +02:00
|
|
|
error("RSA magic 0x%x\n", magic);
|
2000-08-15 12:23:24 +02:00
|
|
|
return False;
|
|
|
|
}
|
|
|
|
|
|
|
|
in_uint32_le(s, modulus_len);
|
|
|
|
if (modulus_len != SEC_MODULUS_SIZE + SEC_PADDING_SIZE)
|
|
|
|
{
|
2001-09-14 15:51:38 +02:00
|
|
|
error("modulus len 0x%x\n", modulus_len);
|
2000-08-15 12:23:24 +02:00
|
|
|
return False;
|
|
|
|
}
|
|
|
|
|
2001-01-06 04:12:10 +01:00
|
|
|
in_uint8s(s, 8); /* modulus_bits, unknown */
|
2000-08-15 12:23:24 +02:00
|
|
|
in_uint8p(s, *exponent, SEC_EXPONENT_SIZE);
|
|
|
|
in_uint8p(s, *modulus, SEC_MODULUS_SIZE);
|
|
|
|
in_uint8s(s, SEC_PADDING_SIZE);
|
|
|
|
|
|
|
|
return s_check(s);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Parse a crypto information structure */
|
2001-01-06 04:47:04 +01:00
|
|
|
static BOOL
|
2002-07-18 18:38:31 +02:00
|
|
|
sec_parse_crypt_info(STREAM s, uint32 * rc4_key_size,
|
2002-07-30 09:18:48 +02:00
|
|
|
uint8 ** server_random, uint8 ** modulus, uint8 ** exponent)
|
2000-08-15 12:23:24 +02:00
|
|
|
{
|
|
|
|
uint32 crypt_level, random_len, rsa_info_len;
|
|
|
|
uint16 tag, length;
|
|
|
|
uint8 *next_tag, *end;
|
|
|
|
|
2001-01-06 04:12:10 +01:00
|
|
|
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 */
|
2002-08-04 05:05:19 +02:00
|
|
|
if (crypt_level == 0) /* no encryptation */
|
|
|
|
return False;
|
2000-08-15 12:23:24 +02:00
|
|
|
in_uint32_le(s, random_len);
|
|
|
|
in_uint32_le(s, rsa_info_len);
|
|
|
|
|
|
|
|
if (random_len != SEC_RANDOM_SIZE)
|
|
|
|
{
|
2001-09-14 15:51:38 +02:00
|
|
|
error("random len %d\n", random_len);
|
2000-08-15 12:23:24 +02:00
|
|
|
return False;
|
|
|
|
}
|
|
|
|
|
|
|
|
in_uint8p(s, *server_random, random_len);
|
|
|
|
|
|
|
|
/* RSA info */
|
|
|
|
end = s->p + rsa_info_len;
|
|
|
|
if (end > s->end)
|
|
|
|
return False;
|
|
|
|
|
2001-01-06 04:12:10 +01:00
|
|
|
in_uint8s(s, 12); /* unknown */
|
2000-08-15 12:23:24 +02:00
|
|
|
|
|
|
|
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:
|
2002-07-30 09:18:48 +02:00
|
|
|
if (!sec_parse_public_key(s, modulus, exponent))
|
2000-08-15 12:23:24 +02:00
|
|
|
return False;
|
|
|
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
case SEC_TAG_KEYSIG:
|
|
|
|
/* Is this a Microsoft key that we just got? */
|
|
|
|
/* Care factor: zero! */
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
2001-09-14 15:51:38 +02:00
|
|
|
unimpl("crypt tag 0x%x\n", tag);
|
2000-08-15 12:23:24 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
s->p = next_tag;
|
|
|
|
}
|
|
|
|
|
|
|
|
return s_check_end(s);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Process crypto information blob */
|
2001-01-06 04:47:04 +01:00
|
|
|
static void
|
|
|
|
sec_process_crypt_info(STREAM s)
|
2000-08-15 12:23:24 +02:00
|
|
|
{
|
|
|
|
uint8 *server_random, *modulus, *exponent;
|
|
|
|
uint8 client_random[SEC_RANDOM_SIZE];
|
|
|
|
uint32 rc4_key_size;
|
|
|
|
|
2002-07-30 09:18:48 +02:00
|
|
|
if (!sec_parse_crypt_info(s, &rc4_key_size, &server_random, &modulus, &exponent))
|
2000-08-15 12:23:24 +02:00
|
|
|
return;
|
|
|
|
|
|
|
|
/* Generate a client random, and hence determine encryption keys */
|
|
|
|
generate_random(client_random);
|
2002-07-30 09:18:48 +02:00
|
|
|
sec_rsa_encrypt(sec_crypted_random, client_random, SEC_RANDOM_SIZE, modulus, exponent);
|
2000-08-15 12:23:24 +02:00
|
|
|
sec_generate_keys(client_random, server_random, rc4_key_size);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Process connect response data blob */
|
2001-01-06 04:47:04 +01:00
|
|
|
static void
|
|
|
|
sec_process_mcs_data(STREAM s)
|
2000-08-15 12:23:24 +02:00
|
|
|
{
|
|
|
|
uint16 tag, length;
|
|
|
|
uint8 *next_tag;
|
2002-08-04 05:42:47 +02:00
|
|
|
uint8 len;
|
2000-08-15 12:23:24 +02:00
|
|
|
|
2002-08-04 05:42:47 +02:00
|
|
|
in_uint8s(s, 21); /* header */
|
|
|
|
in_uint8(s, len);
|
|
|
|
if (len & 0x80)
|
|
|
|
in_uint8(s, len);
|
2000-08-15 12:23:24 +02:00
|
|
|
|
|
|
|
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:
|
|
|
|
case SEC_TAG_SRV_3:
|
|
|
|
break;
|
|
|
|
|
|
|
|
case SEC_TAG_SRV_CRYPT:
|
|
|
|
sec_process_crypt_info(s);
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
2001-09-14 15:51:38 +02:00
|
|
|
unimpl("response tag 0x%x\n", tag);
|
2000-08-15 12:23:24 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
s->p = next_tag;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Receive secure transport packet */
|
2001-01-06 04:47:04 +01:00
|
|
|
STREAM
|
|
|
|
sec_recv()
|
2000-08-15 12:23:24 +02:00
|
|
|
{
|
|
|
|
uint32 sec_flags;
|
|
|
|
STREAM s;
|
|
|
|
|
|
|
|
while ((s = mcs_recv()) != NULL)
|
|
|
|
{
|
2001-09-14 15:51:38 +02:00
|
|
|
if (encryption || !licence_issued)
|
2000-08-15 12:23:24 +02:00
|
|
|
{
|
2001-06-20 15:54:48 +02:00
|
|
|
in_uint32_le(s, sec_flags);
|
|
|
|
|
|
|
|
if (sec_flags & SEC_LICENCE_NEG)
|
|
|
|
{
|
|
|
|
licence_process(s);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (sec_flags & SEC_ENCRYPT)
|
|
|
|
{
|
|
|
|
in_uint8s(s, 8); /* signature */
|
|
|
|
sec_decrypt(s->p, s->end - s->p);
|
|
|
|
}
|
2000-08-15 12:23:24 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
return s;
|
|
|
|
}
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Establish a secure connection */
|
2001-01-06 04:47:04 +01:00
|
|
|
BOOL
|
|
|
|
sec_connect(char *server)
|
2000-08-15 12:23:24 +02:00
|
|
|
{
|
|
|
|
struct stream mcs_data;
|
|
|
|
|
|
|
|
/* We exchange some RDP data during the MCS-Connect */
|
|
|
|
mcs_data.size = 512;
|
|
|
|
mcs_data.p = mcs_data.data = xmalloc(mcs_data.size);
|
|
|
|
sec_out_mcs_data(&mcs_data);
|
|
|
|
|
|
|
|
if (!mcs_connect(server, &mcs_data))
|
|
|
|
return False;
|
|
|
|
|
|
|
|
sec_process_mcs_data(&mcs_data);
|
2001-09-14 15:51:38 +02:00
|
|
|
if (encryption)
|
2001-06-20 15:54:48 +02:00
|
|
|
sec_establish_key();
|
2000-08-15 12:23:24 +02:00
|
|
|
return True;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Disconnect a connection */
|
2001-01-06 04:47:04 +01:00
|
|
|
void
|
|
|
|
sec_disconnect()
|
2000-08-15 12:23:24 +02:00
|
|
|
{
|
|
|
|
mcs_disconnect();
|
|
|
|
}
|