1 |
forsberg |
352 |
/* -*- c-basic-offset: 8 -*- |
2 |
matty |
10 |
rdesktop: A Remote Desktop Protocol client. |
3 |
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Protocol services - RDP encryption and licensing |
4 |
stargo |
828 |
Copyright (C) Matthew Chapman 1999-2005 |
5 |
matty |
10 |
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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" |
22 |
matty |
32 |
|
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#include <openssl/rc4.h> |
24 |
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#include <openssl/md5.h> |
25 |
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#include <openssl/sha.h> |
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#include <openssl/bn.h> |
27 |
forsberg |
352 |
#include <openssl/x509v3.h> |
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matty |
10 |
|
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jsorg71 |
710 |
extern char g_hostname[16]; |
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jsorg71 |
447 |
extern int g_width; |
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extern int g_height; |
32 |
jsorg71 |
710 |
extern int g_keylayout; |
33 |
astrand |
964 |
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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jsorg71 |
437 |
extern BOOL g_encryption; |
37 |
jsorg71 |
380 |
extern BOOL g_licence_issued; |
38 |
jsorg71 |
438 |
extern BOOL g_use_rdp5; |
39 |
matthewc |
482 |
extern BOOL g_console_session; |
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jsorg71 |
438 |
extern int g_server_bpp; |
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forsberg |
412 |
extern uint16 mcs_userid; |
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matthewc |
432 |
extern VCHANNEL g_channels[]; |
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extern unsigned int g_num_channels; |
44 |
matty |
10 |
|
45 |
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static int rc4_key_len; |
46 |
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static RC4_KEY rc4_decrypt_key; |
47 |
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static RC4_KEY rc4_encrypt_key; |
48 |
forsberg |
352 |
static RSA *server_public_key; |
49 |
matty |
10 |
|
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matthewc |
57 |
static uint8 sec_sign_key[16]; |
51 |
matty |
10 |
static uint8 sec_decrypt_key[16]; |
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static uint8 sec_encrypt_key[16]; |
53 |
matthewc |
57 |
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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matty |
10 |
|
57 |
jsorg71 |
438 |
uint16 g_server_rdp_version = 0; |
58 |
forsberg |
352 |
|
59 |
matty |
10 |
/* |
60 |
matthewc |
699 |
* I believe this is based on SSLv3 with the following differences: |
61 |
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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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matty |
10 |
* Both SHA1 and MD5 algorithms are used. |
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*/ |
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matty |
25 |
void |
74 |
astrand |
64 |
sec_hash_48(uint8 * out, uint8 * in, uint8 * salt1, uint8 * salt2, uint8 salt) |
75 |
matty |
10 |
{ |
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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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matty |
24 |
memset(pad, salt + i, i + 1); |
85 |
matty |
10 |
|
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SHA1_Init(&sha); |
87 |
matty |
24 |
SHA1_Update(&sha, pad, i + 1); |
88 |
matty |
10 |
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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matty |
24 |
MD5_Final(&out[i * 16], &md5); |
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matty |
10 |
} |
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} |
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/* |
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matthewc |
699 |
* 16-byte transformation used to generate export keys (6.2.2). |
102 |
matty |
10 |
*/ |
103 |
matty |
25 |
void |
104 |
astrand |
64 |
sec_hash_16(uint8 * out, uint8 * in, uint8 * salt1, uint8 * salt2) |
105 |
matty |
10 |
{ |
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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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} |
114 |
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/* Reduce key entropy from 64 to 40 bits */ |
116 |
matty |
25 |
static void |
117 |
astrand |
64 |
sec_make_40bit(uint8 * key) |
118 |
matty |
10 |
{ |
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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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} |
123 |
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matthewc |
699 |
/* Generate encryption keys given client and server randoms */ |
125 |
matty |
25 |
static void |
126 |
matthewc |
699 |
sec_generate_keys(uint8 * client_random, uint8 * server_random, int rc4_key_size) |
127 |
matty |
10 |
{ |
128 |
matthewc |
699 |
uint8 pre_master_secret[48]; |
129 |
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uint8 master_secret[48]; |
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uint8 key_block[48]; |
131 |
matty |
10 |
|
132 |
matthewc |
699 |
/* Construct pre-master secret */ |
133 |
astrand |
706 |
memcpy(pre_master_secret, client_random, 24); |
134 |
matthewc |
699 |
memcpy(pre_master_secret + 24, server_random, 24); |
135 |
matty |
10 |
|
136 |
matthewc |
699 |
/* Generate master secret and then key material */ |
137 |
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sec_hash_48(master_secret, pre_master_secret, client_random, server_random, 'A'); |
138 |
astrand |
706 |
sec_hash_48(key_block, master_secret, client_random, server_random, 'X'); |
139 |
matty |
10 |
|
140 |
matthewc |
699 |
/* First 16 bytes of key material is MAC secret */ |
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memcpy(sec_sign_key, key_block, 16); |
142 |
matty |
10 |
|
143 |
matthewc |
699 |
/* Generate export keys from next two blocks of 16 bytes */ |
144 |
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sec_hash_16(sec_decrypt_key, &key_block[16], client_random, server_random); |
145 |
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sec_hash_16(sec_encrypt_key, &key_block[32], client_random, server_random); |
146 |
matty |
10 |
|
147 |
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if (rc4_key_size == 1) |
148 |
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{ |
149 |
matty |
30 |
DEBUG(("40-bit encryption enabled\n")); |
150 |
matty |
10 |
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; |
154 |
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} |
155 |
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else |
156 |
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{ |
157 |
forsberg |
352 |
DEBUG(("rc_4_key_size == %d, 128-bit encryption enabled\n", rc4_key_size)); |
158 |
matty |
10 |
rc4_key_len = 16; |
159 |
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} |
160 |
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161 |
matthewc |
57 |
/* Save initial RC4 keys as update keys */ |
162 |
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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); |
164 |
matty |
10 |
|
165 |
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/* Initialise RC4 state arrays */ |
166 |
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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); |
168 |
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} |
169 |
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170 |
matty |
24 |
static uint8 pad_54[40] = { |
171 |
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54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, |
172 |
matty |
25 |
54, 54, 54, |
173 |
matty |
24 |
54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, |
174 |
matty |
25 |
54, 54, 54 |
175 |
matty |
10 |
}; |
176 |
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|
177 |
matty |
24 |
static uint8 pad_92[48] = { |
178 |
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92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, |
179 |
matty |
25 |
92, 92, 92, 92, 92, 92, 92, |
180 |
matty |
24 |
92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, |
181 |
matty |
25 |
92, 92, 92, 92, 92, 92, 92 |
182 |
matty |
10 |
}; |
183 |
|
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184 |
|
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/* Output a uint32 into a buffer (little-endian) */ |
185 |
matty |
25 |
void |
186 |
astrand |
64 |
buf_out_uint32(uint8 * buffer, uint32 value) |
187 |
matty |
10 |
{ |
188 |
|
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buffer[0] = (value) & 0xff; |
189 |
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buffer[1] = (value >> 8) & 0xff; |
190 |
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buffer[2] = (value >> 16) & 0xff; |
191 |
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buffer[3] = (value >> 24) & 0xff; |
192 |
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} |
193 |
|
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|
194 |
matthewc |
699 |
/* Generate a MAC hash (5.2.3.1), using a combination of SHA1 and MD5 */ |
195 |
matty |
25 |
void |
196 |
astrand |
82 |
sec_sign(uint8 * signature, int siglen, uint8 * session_key, int keylen, uint8 * data, int datalen) |
197 |
matty |
10 |
{ |
198 |
|
|
uint8 shasig[20]; |
199 |
|
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uint8 md5sig[16]; |
200 |
|
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uint8 lenhdr[4]; |
201 |
|
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SHA_CTX sha; |
202 |
|
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MD5_CTX md5; |
203 |
|
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|
204 |
matty |
24 |
buf_out_uint32(lenhdr, datalen); |
205 |
matty |
10 |
|
206 |
|
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SHA1_Init(&sha); |
207 |
matthewc |
61 |
SHA1_Update(&sha, session_key, keylen); |
208 |
matty |
10 |
SHA1_Update(&sha, pad_54, 40); |
209 |
|
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SHA1_Update(&sha, lenhdr, 4); |
210 |
|
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SHA1_Update(&sha, data, datalen); |
211 |
|
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SHA1_Final(shasig, &sha); |
212 |
|
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|
213 |
|
|
MD5_Init(&md5); |
214 |
matthewc |
61 |
MD5_Update(&md5, session_key, keylen); |
215 |
matty |
10 |
MD5_Update(&md5, pad_92, 48); |
216 |
|
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MD5_Update(&md5, shasig, 20); |
217 |
|
|
MD5_Final(md5sig, &md5); |
218 |
|
|
|
219 |
matthewc |
61 |
memcpy(signature, md5sig, siglen); |
220 |
matty |
10 |
} |
221 |
|
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|
222 |
matthewc |
699 |
/* Update an encryption key */ |
223 |
matty |
25 |
static void |
224 |
astrand |
64 |
sec_update(uint8 * key, uint8 * update_key) |
225 |
matty |
10 |
{ |
226 |
|
|
uint8 shasig[20]; |
227 |
|
|
SHA_CTX sha; |
228 |
|
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MD5_CTX md5; |
229 |
|
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RC4_KEY update; |
230 |
|
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|
231 |
|
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SHA1_Init(&sha); |
232 |
matthewc |
57 |
SHA1_Update(&sha, update_key, rc4_key_len); |
233 |
matty |
10 |
SHA1_Update(&sha, pad_54, 40); |
234 |
matthewc |
57 |
SHA1_Update(&sha, key, rc4_key_len); |
235 |
matty |
10 |
SHA1_Final(shasig, &sha); |
236 |
|
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|
237 |
|
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MD5_Init(&md5); |
238 |
matthewc |
57 |
MD5_Update(&md5, update_key, rc4_key_len); |
239 |
matty |
10 |
MD5_Update(&md5, pad_92, 48); |
240 |
|
|
MD5_Update(&md5, shasig, 20); |
241 |
|
|
MD5_Final(key, &md5); |
242 |
|
|
|
243 |
|
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RC4_set_key(&update, rc4_key_len, key); |
244 |
|
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RC4(&update, rc4_key_len, key, key); |
245 |
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|
246 |
|
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if (rc4_key_len == 8) |
247 |
|
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sec_make_40bit(key); |
248 |
|
|
} |
249 |
|
|
|
250 |
|
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/* Encrypt data using RC4 */ |
251 |
matty |
25 |
static void |
252 |
astrand |
64 |
sec_encrypt(uint8 * data, int length) |
253 |
matty |
10 |
{ |
254 |
|
|
static int use_count; |
255 |
|
|
|
256 |
|
|
if (use_count == 4096) |
257 |
|
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{ |
258 |
|
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sec_update(sec_encrypt_key, sec_encrypt_update_key); |
259 |
|
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RC4_set_key(&rc4_encrypt_key, rc4_key_len, sec_encrypt_key); |
260 |
|
|
use_count = 0; |
261 |
|
|
} |
262 |
|
|
|
263 |
|
|
RC4(&rc4_encrypt_key, length, data, data); |
264 |
|
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use_count++; |
265 |
|
|
} |
266 |
|
|
|
267 |
|
|
/* Decrypt data using RC4 */ |
268 |
forsberg |
352 |
void |
269 |
astrand |
64 |
sec_decrypt(uint8 * data, int length) |
270 |
matty |
10 |
{ |
271 |
|
|
static int use_count; |
272 |
|
|
|
273 |
|
|
if (use_count == 4096) |
274 |
|
|
{ |
275 |
|
|
sec_update(sec_decrypt_key, sec_decrypt_update_key); |
276 |
|
|
RC4_set_key(&rc4_decrypt_key, rc4_key_len, sec_decrypt_key); |
277 |
|
|
use_count = 0; |
278 |
|
|
} |
279 |
|
|
|
280 |
|
|
RC4(&rc4_decrypt_key, length, data, data); |
281 |
|
|
use_count++; |
282 |
|
|
} |
283 |
|
|
|
284 |
matty |
25 |
static void |
285 |
astrand |
64 |
reverse(uint8 * p, int len) |
286 |
matty |
10 |
{ |
287 |
|
|
int i, j; |
288 |
matty |
32 |
uint8 temp; |
289 |
matty |
10 |
|
290 |
astrand |
64 |
for (i = 0, j = len - 1; i < j; i++, j--) |
291 |
matty |
10 |
{ |
292 |
matty |
32 |
temp = p[i]; |
293 |
|
|
p[i] = p[j]; |
294 |
|
|
p[j] = temp; |
295 |
matty |
10 |
} |
296 |
|
|
} |
297 |
|
|
|
298 |
|
|
/* Perform an RSA public key encryption operation */ |
299 |
matty |
25 |
static void |
300 |
astrand |
82 |
sec_rsa_encrypt(uint8 * out, uint8 * in, int len, uint8 * modulus, uint8 * exponent) |
301 |
matty |
10 |
{ |
302 |
matthewc |
295 |
BN_CTX *ctx; |
303 |
matty |
32 |
BIGNUM mod, exp, x, y; |
304 |
|
|
uint8 inr[SEC_MODULUS_SIZE]; |
305 |
|
|
int outlen; |
306 |
matty |
10 |
|
307 |
matty |
32 |
reverse(modulus, SEC_MODULUS_SIZE); |
308 |
|
|
reverse(exponent, SEC_EXPONENT_SIZE); |
309 |
|
|
memcpy(inr, in, len); |
310 |
|
|
reverse(inr, len); |
311 |
matty |
10 |
|
312 |
matthewc |
295 |
ctx = BN_CTX_new(); |
313 |
matty |
32 |
BN_init(&mod); |
314 |
|
|
BN_init(&exp); |
315 |
|
|
BN_init(&x); |
316 |
|
|
BN_init(&y); |
317 |
|
|
|
318 |
|
|
BN_bin2bn(modulus, SEC_MODULUS_SIZE, &mod); |
319 |
|
|
BN_bin2bn(exponent, SEC_EXPONENT_SIZE, &exp); |
320 |
|
|
BN_bin2bn(inr, len, &x); |
321 |
matthewc |
295 |
BN_mod_exp(&y, &x, &exp, &mod, ctx); |
322 |
matty |
32 |
outlen = BN_bn2bin(&y, out); |
323 |
|
|
reverse(out, outlen); |
324 |
|
|
if (outlen < SEC_MODULUS_SIZE) |
325 |
astrand |
64 |
memset(out + outlen, 0, SEC_MODULUS_SIZE - outlen); |
326 |
matty |
32 |
|
327 |
|
|
BN_free(&y); |
328 |
|
|
BN_clear_free(&x); |
329 |
|
|
BN_free(&exp); |
330 |
|
|
BN_free(&mod); |
331 |
matthewc |
295 |
BN_CTX_free(ctx); |
332 |
matty |
10 |
} |
333 |
|
|
|
334 |
|
|
/* Initialise secure transport packet */ |
335 |
matty |
25 |
STREAM |
336 |
|
|
sec_init(uint32 flags, int maxlen) |
337 |
matty |
10 |
{ |
338 |
|
|
int hdrlen; |
339 |
|
|
STREAM s; |
340 |
|
|
|
341 |
jsorg71 |
380 |
if (!g_licence_issued) |
342 |
matty |
28 |
hdrlen = (flags & SEC_ENCRYPT) ? 12 : 4; |
343 |
|
|
else |
344 |
|
|
hdrlen = (flags & SEC_ENCRYPT) ? 12 : 0; |
345 |
matty |
24 |
s = mcs_init(maxlen + hdrlen); |
346 |
matty |
10 |
s_push_layer(s, sec_hdr, hdrlen); |
347 |
|
|
|
348 |
|
|
return s; |
349 |
|
|
} |
350 |
|
|
|
351 |
forsberg |
412 |
/* Transmit secure transport packet over specified channel */ |
352 |
matty |
25 |
void |
353 |
forsberg |
412 |
sec_send_to_channel(STREAM s, uint32 flags, uint16 channel) |
354 |
matty |
10 |
{ |
355 |
|
|
int datalen; |
356 |
|
|
|
357 |
|
|
s_pop_layer(s, sec_hdr); |
358 |
jsorg71 |
380 |
if (!g_licence_issued || (flags & SEC_ENCRYPT)) |
359 |
matty |
28 |
out_uint32_le(s, flags); |
360 |
matty |
10 |
|
361 |
|
|
if (flags & SEC_ENCRYPT) |
362 |
|
|
{ |
363 |
|
|
flags &= ~SEC_ENCRYPT; |
364 |
|
|
datalen = s->end - s->p - 8; |
365 |
|
|
|
366 |
matty |
30 |
#if WITH_DEBUG |
367 |
|
|
DEBUG(("Sending encrypted packet:\n")); |
368 |
matty |
24 |
hexdump(s->p + 8, datalen); |
369 |
matty |
10 |
#endif |
370 |
|
|
|
371 |
astrand |
82 |
sec_sign(s->p, 8, sec_sign_key, rc4_key_len, s->p + 8, datalen); |
372 |
matty |
24 |
sec_encrypt(s->p + 8, datalen); |
373 |
matty |
10 |
} |
374 |
|
|
|
375 |
forsberg |
412 |
mcs_send_to_channel(s, channel); |
376 |
matty |
10 |
} |
377 |
|
|
|
378 |
forsberg |
412 |
/* Transmit secure transport packet */ |
379 |
|
|
|
380 |
|
|
void |
381 |
|
|
sec_send(STREAM s, uint32 flags) |
382 |
|
|
{ |
383 |
|
|
sec_send_to_channel(s, flags, MCS_GLOBAL_CHANNEL); |
384 |
|
|
} |
385 |
|
|
|
386 |
|
|
|
387 |
matty |
10 |
/* Transfer the client random to the server */ |
388 |
matty |
25 |
static void |
389 |
matthewc |
192 |
sec_establish_key(void) |
390 |
matty |
10 |
{ |
391 |
|
|
uint32 length = SEC_MODULUS_SIZE + SEC_PADDING_SIZE; |
392 |
|
|
uint32 flags = SEC_CLIENT_RANDOM; |
393 |
|
|
STREAM s; |
394 |
|
|
|
395 |
|
|
s = sec_init(flags, 76); |
396 |
|
|
|
397 |
|
|
out_uint32_le(s, length); |
398 |
|
|
out_uint8p(s, sec_crypted_random, SEC_MODULUS_SIZE); |
399 |
|
|
out_uint8s(s, SEC_PADDING_SIZE); |
400 |
|
|
|
401 |
|
|
s_mark_end(s); |
402 |
|
|
sec_send(s, flags); |
403 |
|
|
} |
404 |
|
|
|
405 |
|
|
/* Output connect initial data blob */ |
406 |
matty |
25 |
static void |
407 |
|
|
sec_out_mcs_data(STREAM s) |
408 |
matty |
10 |
{ |
409 |
jsorg71 |
710 |
int hostlen = 2 * strlen(g_hostname); |
410 |
matthewc |
432 |
int length = 158 + 76 + 12 + 4; |
411 |
|
|
unsigned int i; |
412 |
astrand |
101 |
|
413 |
matthewc |
432 |
if (g_num_channels > 0) |
414 |
astrand |
435 |
length += g_num_channels * 12 + 8; |
415 |
forsberg |
412 |
|
416 |
jsorg71 |
88 |
if (hostlen > 30) |
417 |
|
|
hostlen = 30; |
418 |
matty |
10 |
|
419 |
matthewc |
642 |
/* Generic Conference Control (T.124) ConferenceCreateRequest */ |
420 |
|
|
out_uint16_be(s, 5); |
421 |
matty |
10 |
out_uint16_be(s, 0x14); |
422 |
|
|
out_uint8(s, 0x7c); |
423 |
|
|
out_uint16_be(s, 1); |
424 |
|
|
|
425 |
forsberg |
352 |
out_uint16_be(s, (length | 0x8000)); /* remaining length */ |
426 |
matty |
10 |
|
427 |
|
|
out_uint16_be(s, 8); /* length? */ |
428 |
|
|
out_uint16_be(s, 16); |
429 |
|
|
out_uint8(s, 0); |
430 |
|
|
out_uint16_le(s, 0xc001); |
431 |
|
|
out_uint8(s, 0); |
432 |
|
|
|
433 |
matthewc |
642 |
out_uint32_le(s, 0x61637544); /* OEM ID: "Duca", as in Ducati. */ |
434 |
forsberg |
352 |
out_uint16_be(s, ((length - 14) | 0x8000)); /* remaining length */ |
435 |
matty |
10 |
|
436 |
|
|
/* Client information */ |
437 |
|
|
out_uint16_le(s, SEC_TAG_CLI_INFO); |
438 |
forsberg |
352 |
out_uint16_le(s, 212); /* length */ |
439 |
jsorg71 |
438 |
out_uint16_le(s, g_use_rdp5 ? 4 : 1); /* RDP version. 1 == RDP4, 4 == RDP5. */ |
440 |
matty |
10 |
out_uint16_le(s, 8); |
441 |
jsorg71 |
447 |
out_uint16_le(s, g_width); |
442 |
|
|
out_uint16_le(s, g_height); |
443 |
matty |
10 |
out_uint16_le(s, 0xca01); |
444 |
|
|
out_uint16_le(s, 0xaa03); |
445 |
jsorg71 |
710 |
out_uint32_le(s, g_keylayout); |
446 |
forsberg |
352 |
out_uint32_le(s, 2600); /* Client build. We are now 2600 compatible :-) */ |
447 |
matty |
10 |
|
448 |
|
|
/* Unicode name of client, padded to 32 bytes */ |
449 |
jsorg71 |
710 |
rdp_out_unistr(s, g_hostname, hostlen); |
450 |
matty |
24 |
out_uint8s(s, 30 - hostlen); |
451 |
matty |
10 |
|
452 |
astrand |
964 |
out_uint32_le(s, g_keyboard_type); |
453 |
|
|
out_uint32_le(s, g_keyboard_subtype); |
454 |
|
|
out_uint32_le(s, g_keyboard_functionkeys); |
455 |
matty |
24 |
out_uint8s(s, 64); /* reserved? 4 + 12 doublewords */ |
456 |
n-ki |
677 |
out_uint16_le(s, 0xca01); /* colour depth? */ |
457 |
matthewc |
365 |
out_uint16_le(s, 1); |
458 |
matty |
10 |
|
459 |
forsberg |
352 |
out_uint32(s, 0); |
460 |
jsorg71 |
438 |
out_uint8(s, g_server_bpp); |
461 |
forsberg |
357 |
out_uint16_le(s, 0x0700); |
462 |
|
|
out_uint8(s, 0); |
463 |
forsberg |
352 |
out_uint32_le(s, 1); |
464 |
|
|
out_uint8s(s, 64); /* End of client info */ |
465 |
|
|
|
466 |
|
|
out_uint16_le(s, SEC_TAG_CLI_4); |
467 |
|
|
out_uint16_le(s, 12); |
468 |
matthewc |
482 |
out_uint32_le(s, g_console_session ? 0xb : 9); |
469 |
matthewc |
365 |
out_uint32(s, 0); |
470 |
forsberg |
352 |
|
471 |
matty |
10 |
/* Client encryption settings */ |
472 |
|
|
out_uint16_le(s, SEC_TAG_CLI_CRYPT); |
473 |
forsberg |
352 |
out_uint16_le(s, 12); /* length */ |
474 |
jsorg71 |
437 |
out_uint32_le(s, g_encryption ? 0x3 : 0); /* encryption supported, 128-bit supported */ |
475 |
matthewc |
365 |
out_uint32(s, 0); /* Unknown */ |
476 |
forsberg |
352 |
|
477 |
matthewc |
432 |
DEBUG_RDP5(("g_num_channels is %d\n", g_num_channels)); |
478 |
|
|
if (g_num_channels > 0) |
479 |
forsberg |
412 |
{ |
480 |
|
|
out_uint16_le(s, SEC_TAG_CLI_CHANNELS); |
481 |
matthewc |
432 |
out_uint16_le(s, g_num_channels * 12 + 8); /* length */ |
482 |
|
|
out_uint32_le(s, g_num_channels); /* number of virtual channels */ |
483 |
|
|
for (i = 0; i < g_num_channels; i++) |
484 |
forsberg |
412 |
{ |
485 |
matthewc |
432 |
DEBUG_RDP5(("Requesting channel %s\n", g_channels[i].name)); |
486 |
|
|
out_uint8a(s, g_channels[i].name, 8); |
487 |
|
|
out_uint32_be(s, g_channels[i].flags); |
488 |
forsberg |
412 |
} |
489 |
|
|
} |
490 |
forsberg |
352 |
|
491 |
matty |
10 |
s_mark_end(s); |
492 |
|
|
} |
493 |
|
|
|
494 |
|
|
/* Parse a public key structure */ |
495 |
matty |
25 |
static BOOL |
496 |
astrand |
64 |
sec_parse_public_key(STREAM s, uint8 ** modulus, uint8 ** exponent) |
497 |
matty |
10 |
{ |
498 |
|
|
uint32 magic, modulus_len; |
499 |
|
|
|
500 |
|
|
in_uint32_le(s, magic); |
501 |
|
|
if (magic != SEC_RSA_MAGIC) |
502 |
|
|
{ |
503 |
matty |
30 |
error("RSA magic 0x%x\n", magic); |
504 |
matty |
10 |
return False; |
505 |
|
|
} |
506 |
|
|
|
507 |
|
|
in_uint32_le(s, modulus_len); |
508 |
|
|
if (modulus_len != SEC_MODULUS_SIZE + SEC_PADDING_SIZE) |
509 |
|
|
{ |
510 |
matty |
30 |
error("modulus len 0x%x\n", modulus_len); |
511 |
matty |
10 |
return False; |
512 |
|
|
} |
513 |
|
|
|
514 |
matty |
24 |
in_uint8s(s, 8); /* modulus_bits, unknown */ |
515 |
matty |
10 |
in_uint8p(s, *exponent, SEC_EXPONENT_SIZE); |
516 |
|
|
in_uint8p(s, *modulus, SEC_MODULUS_SIZE); |
517 |
|
|
in_uint8s(s, SEC_PADDING_SIZE); |
518 |
|
|
|
519 |
|
|
return s_check(s); |
520 |
|
|
} |
521 |
|
|
|
522 |
forsberg |
352 |
static BOOL |
523 |
|
|
sec_parse_x509_key(X509 * cert) |
524 |
|
|
{ |
525 |
|
|
EVP_PKEY *epk = NULL; |
526 |
|
|
/* By some reason, Microsoft sets the OID of the Public RSA key to |
527 |
|
|
the oid for "MD5 with RSA Encryption" instead of "RSA Encryption" |
528 |
|
|
|
529 |
|
|
Kudos to Richard Levitte for the following (. intiutive .) |
530 |
|
|
lines of code that resets the OID and let's us extract the key. */ |
531 |
|
|
if (OBJ_obj2nid(cert->cert_info->key->algor->algorithm) == NID_md5WithRSAEncryption) |
532 |
|
|
{ |
533 |
|
|
DEBUG_RDP5(("Re-setting algorithm type to RSA in server certificate\n")); |
534 |
|
|
cert->cert_info->key->algor->algorithm = OBJ_nid2obj(NID_rsaEncryption); |
535 |
|
|
} |
536 |
|
|
epk = X509_get_pubkey(cert); |
537 |
|
|
if (NULL == epk) |
538 |
|
|
{ |
539 |
|
|
error("Failed to extract public key from certificate\n"); |
540 |
|
|
return False; |
541 |
|
|
} |
542 |
|
|
|
543 |
|
|
server_public_key = (RSA *) epk->pkey.ptr; |
544 |
|
|
|
545 |
|
|
return True; |
546 |
|
|
} |
547 |
|
|
|
548 |
|
|
|
549 |
matty |
10 |
/* Parse a crypto information structure */ |
550 |
matty |
25 |
static BOOL |
551 |
astrand |
64 |
sec_parse_crypt_info(STREAM s, uint32 * rc4_key_size, |
552 |
astrand |
82 |
uint8 ** server_random, uint8 ** modulus, uint8 ** exponent) |
553 |
matty |
10 |
{ |
554 |
|
|
uint32 crypt_level, random_len, rsa_info_len; |
555 |
matthewc |
363 |
uint32 cacert_len, cert_len, flags; |
556 |
forsberg |
352 |
X509 *cacert, *server_cert; |
557 |
matty |
10 |
uint16 tag, length; |
558 |
|
|
uint8 *next_tag, *end; |
559 |
|
|
|
560 |
matty |
24 |
in_uint32_le(s, *rc4_key_size); /* 1 = 40-bit, 2 = 128-bit */ |
561 |
|
|
in_uint32_le(s, crypt_level); /* 1 = low, 2 = medium, 3 = high */ |
562 |
forsberg |
352 |
if (crypt_level == 0) /* no encryption */ |
563 |
jsorg71 |
89 |
return False; |
564 |
matty |
10 |
in_uint32_le(s, random_len); |
565 |
|
|
in_uint32_le(s, rsa_info_len); |
566 |
|
|
|
567 |
|
|
if (random_len != SEC_RANDOM_SIZE) |
568 |
|
|
{ |
569 |
forsberg |
352 |
error("random len %d, expected %d\n", random_len, SEC_RANDOM_SIZE); |
570 |
matty |
10 |
return False; |
571 |
|
|
} |
572 |
|
|
|
573 |
|
|
in_uint8p(s, *server_random, random_len); |
574 |
|
|
|
575 |
|
|
/* RSA info */ |
576 |
|
|
end = s->p + rsa_info_len; |
577 |
|
|
if (end > s->end) |
578 |
|
|
return False; |
579 |
|
|
|
580 |
forsberg |
412 |
in_uint32_le(s, flags); /* 1 = RDP4-style, 0x80000002 = X.509 */ |
581 |
matthewc |
363 |
if (flags & 1) |
582 |
forsberg |
352 |
{ |
583 |
|
|
DEBUG_RDP5(("We're going for the RDP4-style encryption\n")); |
584 |
matthewc |
363 |
in_uint8s(s, 8); /* unknown */ |
585 |
matty |
10 |
|
586 |
forsberg |
352 |
while (s->p < end) |
587 |
|
|
{ |
588 |
|
|
in_uint16_le(s, tag); |
589 |
|
|
in_uint16_le(s, length); |
590 |
|
|
|
591 |
|
|
next_tag = s->p + length; |
592 |
|
|
|
593 |
|
|
switch (tag) |
594 |
|
|
{ |
595 |
|
|
case SEC_TAG_PUBKEY: |
596 |
|
|
if (!sec_parse_public_key(s, modulus, exponent)) |
597 |
|
|
return False; |
598 |
|
|
DEBUG_RDP5(("Got Public key, RDP4-style\n")); |
599 |
|
|
|
600 |
|
|
break; |
601 |
|
|
|
602 |
|
|
case SEC_TAG_KEYSIG: |
603 |
|
|
/* Is this a Microsoft key that we just got? */ |
604 |
|
|
/* Care factor: zero! */ |
605 |
|
|
/* Actually, it would probably be a good idea to check if the public key is signed with this key, and then store this |
606 |
|
|
key as a known key of the hostname. This would prevent some MITM-attacks. */ |
607 |
|
|
break; |
608 |
|
|
|
609 |
|
|
default: |
610 |
|
|
unimpl("crypt tag 0x%x\n", tag); |
611 |
|
|
} |
612 |
|
|
|
613 |
|
|
s->p = next_tag; |
614 |
|
|
} |
615 |
|
|
} |
616 |
matthewc |
363 |
else |
617 |
matty |
10 |
{ |
618 |
stargo |
557 |
uint32 certcount; |
619 |
|
|
|
620 |
forsberg |
352 |
DEBUG_RDP5(("We're going for the RDP5-style encryption\n")); |
621 |
astrand |
580 |
in_uint32_le(s, certcount); /* Number of certificates */ |
622 |
matty |
10 |
|
623 |
astrand |
580 |
if (certcount < 2) |
624 |
stargo |
557 |
{ |
625 |
|
|
error("Server didn't send enough X509 certificates\n"); |
626 |
|
|
return False; |
627 |
|
|
} |
628 |
|
|
|
629 |
astrand |
580 |
for (; certcount > 2; certcount--) |
630 |
|
|
{ /* ignore all the certificates between the root and the signing CA */ |
631 |
stargo |
557 |
uint32 ignorelen; |
632 |
|
|
X509 *ignorecert; |
633 |
|
|
|
634 |
|
|
DEBUG_RDP5(("Ignored certs left: %d\n", certcount)); |
635 |
|
|
|
636 |
|
|
in_uint32_le(s, ignorelen); |
637 |
|
|
DEBUG_RDP5(("Ignored Certificate length is %d\n", ignorelen)); |
638 |
|
|
ignorecert = d2i_X509(NULL, &(s->p), ignorelen); |
639 |
|
|
|
640 |
astrand |
580 |
if (ignorecert == NULL) |
641 |
|
|
{ /* XXX: error out? */ |
642 |
stargo |
557 |
DEBUG_RDP5(("got a bad cert: this will probably screw up the rest of the communication\n")); |
643 |
|
|
} |
644 |
|
|
|
645 |
|
|
#ifdef WITH_DEBUG_RDP5 |
646 |
astrand |
580 |
DEBUG_RDP5(("cert #%d (ignored):\n", certcount)); |
647 |
stargo |
557 |
X509_print_fp(stdout, ignorecert); |
648 |
|
|
#endif |
649 |
|
|
} |
650 |
|
|
|
651 |
forsberg |
352 |
/* Do da funky X.509 stuffy |
652 |
matty |
10 |
|
653 |
forsberg |
352 |
"How did I find out about this? I looked up and saw a |
654 |
|
|
bright light and when I came to I had a scar on my forehead |
655 |
|
|
and knew about X.500" |
656 |
|
|
- Peter Gutman in a early version of |
657 |
|
|
http://www.cs.auckland.ac.nz/~pgut001/pubs/x509guide.txt |
658 |
|
|
*/ |
659 |
|
|
|
660 |
|
|
in_uint32_le(s, cacert_len); |
661 |
forsberg |
419 |
DEBUG_RDP5(("CA Certificate length is %d\n", cacert_len)); |
662 |
forsberg |
352 |
cacert = d2i_X509(NULL, &(s->p), cacert_len); |
663 |
|
|
/* Note: We don't need to move s->p here - d2i_X509 is |
664 |
|
|
"kind" enough to do it for us */ |
665 |
|
|
if (NULL == cacert) |
666 |
matty |
10 |
{ |
667 |
forsberg |
352 |
error("Couldn't load CA Certificate from server\n"); |
668 |
|
|
return False; |
669 |
|
|
} |
670 |
matty |
10 |
|
671 |
forsberg |
352 |
/* Currently, we don't use the CA Certificate. |
672 |
|
|
FIXME: |
673 |
|
|
*) Verify the server certificate (server_cert) with the |
674 |
|
|
CA certificate. |
675 |
|
|
*) Store the CA Certificate with the hostname of the |
676 |
|
|
server we are connecting to as key, and compare it |
677 |
|
|
when we connect the next time, in order to prevent |
678 |
|
|
MITM-attacks. |
679 |
|
|
*/ |
680 |
matty |
10 |
|
681 |
forsberg |
352 |
in_uint32_le(s, cert_len); |
682 |
forsberg |
419 |
DEBUG_RDP5(("Certificate length is %d\n", cert_len)); |
683 |
forsberg |
352 |
server_cert = d2i_X509(NULL, &(s->p), cert_len); |
684 |
|
|
if (NULL == server_cert) |
685 |
|
|
{ |
686 |
|
|
error("Couldn't load Certificate from server\n"); |
687 |
|
|
return False; |
688 |
|
|
} |
689 |
matty |
10 |
|
690 |
forsberg |
352 |
in_uint8s(s, 16); /* Padding */ |
691 |
|
|
|
692 |
|
|
/* Note: Verifying the server certificate must be done here, |
693 |
|
|
before sec_parse_public_key since we'll have to apply |
694 |
|
|
serious violence to the key after this */ |
695 |
|
|
|
696 |
|
|
if (!sec_parse_x509_key(server_cert)) |
697 |
|
|
{ |
698 |
|
|
DEBUG_RDP5(("Didn't parse X509 correctly\n")); |
699 |
|
|
return False; |
700 |
matty |
10 |
} |
701 |
forsberg |
352 |
return True; /* There's some garbage here we don't care about */ |
702 |
matty |
10 |
} |
703 |
|
|
return s_check_end(s); |
704 |
|
|
} |
705 |
|
|
|
706 |
|
|
/* Process crypto information blob */ |
707 |
matty |
25 |
static void |
708 |
|
|
sec_process_crypt_info(STREAM s) |
709 |
matty |
10 |
{ |
710 |
|
|
uint8 *server_random, *modulus, *exponent; |
711 |
|
|
uint8 client_random[SEC_RANDOM_SIZE]; |
712 |
|
|
uint32 rc4_key_size; |
713 |
forsberg |
352 |
uint8 inr[SEC_MODULUS_SIZE]; |
714 |
matty |
10 |
|
715 |
astrand |
82 |
if (!sec_parse_crypt_info(s, &rc4_key_size, &server_random, &modulus, &exponent)) |
716 |
forsberg |
352 |
{ |
717 |
|
|
DEBUG(("Failed to parse crypt info\n")); |
718 |
matty |
10 |
return; |
719 |
forsberg |
352 |
} |
720 |
matty |
10 |
|
721 |
forsberg |
352 |
DEBUG(("Generating client random\n")); |
722 |
forsberg |
412 |
/* Generate a client random, and hence determine encryption keys */ |
723 |
astrand |
540 |
/* This is what the MS client do: */ |
724 |
forsberg |
377 |
memset(inr, 0, SEC_RANDOM_SIZE); |
725 |
|
|
/* *ARIGL!* Plaintext attack, anyone? |
726 |
forsberg |
412 |
I tried doing: |
727 |
|
|
generate_random(inr); |
728 |
|
|
..but that generates connection errors now and then (yes, |
729 |
|
|
"now and then". Something like 0 to 3 attempts needed before a |
730 |
|
|
successful connection. Nice. Not! |
731 |
|
|
*/ |
732 |
forsberg |
377 |
|
733 |
matty |
10 |
generate_random(client_random); |
734 |
forsberg |
352 |
if (NULL != server_public_key) |
735 |
|
|
{ /* Which means we should use |
736 |
|
|
RDP5-style encryption */ |
737 |
|
|
|
738 |
|
|
memcpy(inr + SEC_RANDOM_SIZE, client_random, SEC_RANDOM_SIZE); |
739 |
|
|
reverse(inr + SEC_RANDOM_SIZE, SEC_RANDOM_SIZE); |
740 |
|
|
|
741 |
|
|
RSA_public_encrypt(SEC_MODULUS_SIZE, |
742 |
|
|
inr, sec_crypted_random, server_public_key, RSA_NO_PADDING); |
743 |
|
|
|
744 |
|
|
reverse(sec_crypted_random, SEC_MODULUS_SIZE); |
745 |
|
|
|
746 |
|
|
} |
747 |
|
|
else |
748 |
|
|
{ /* RDP4-style encryption */ |
749 |
|
|
sec_rsa_encrypt(sec_crypted_random, |
750 |
|
|
client_random, SEC_RANDOM_SIZE, modulus, exponent); |
751 |
|
|
} |
752 |
matty |
10 |
sec_generate_keys(client_random, server_random, rc4_key_size); |
753 |
|
|
} |
754 |
|
|
|
755 |
forsberg |
352 |
|
756 |
|
|
/* Process SRV_INFO, find RDP version supported by server */ |
757 |
|
|
static void |
758 |
|
|
sec_process_srv_info(STREAM s) |
759 |
|
|
{ |
760 |
jsorg71 |
438 |
in_uint16_le(s, g_server_rdp_version); |
761 |
|
|
DEBUG_RDP5(("Server RDP version is %d\n", g_server_rdp_version)); |
762 |
|
|
if (1 == g_server_rdp_version) |
763 |
n-ki |
677 |
{ |
764 |
jsorg71 |
438 |
g_use_rdp5 = 0; |
765 |
n-ki |
677 |
g_server_bpp = 8; |
766 |
|
|
} |
767 |
forsberg |
352 |
} |
768 |
|
|
|
769 |
|
|
|
770 |
matty |
10 |
/* Process connect response data blob */ |
771 |
forsberg |
352 |
void |
772 |
matty |
25 |
sec_process_mcs_data(STREAM s) |
773 |
matty |
10 |
{ |
774 |
|
|
uint16 tag, length; |
775 |
|
|
uint8 *next_tag; |
776 |
jsorg71 |
90 |
uint8 len; |
777 |
matty |
10 |
|
778 |
matthewc |
642 |
in_uint8s(s, 21); /* header (T.124 ConferenceCreateResponse) */ |
779 |
jsorg71 |
90 |
in_uint8(s, len); |
780 |
|
|
if (len & 0x80) |
781 |
|
|
in_uint8(s, len); |
782 |
matty |
10 |
|
783 |
|
|
while (s->p < s->end) |
784 |
|
|
{ |
785 |
|
|
in_uint16_le(s, tag); |
786 |
|
|
in_uint16_le(s, length); |
787 |
|
|
|
788 |
|
|
if (length <= 4) |
789 |
|
|
return; |
790 |
|
|
|
791 |
|
|
next_tag = s->p + length - 4; |
792 |
|
|
|
793 |
|
|
switch (tag) |
794 |
|
|
{ |
795 |
|
|
case SEC_TAG_SRV_INFO: |
796 |
forsberg |
352 |
sec_process_srv_info(s); |
797 |
|
|
break; |
798 |
|
|
|
799 |
matthewc |
432 |
case SEC_TAG_SRV_CRYPT: |
800 |
|
|
sec_process_crypt_info(s); |
801 |
|
|
break; |
802 |
|
|
|
803 |
|
|
case SEC_TAG_SRV_CHANNELS: |
804 |
forsberg |
419 |
/* FIXME: We should parse this information and |
805 |
|
|
use it to map RDP5 channels to MCS |
806 |
astrand |
435 |
channels */ |
807 |
matty |
10 |
break; |
808 |
|
|
|
809 |
|
|
default: |
810 |
matty |
30 |
unimpl("response tag 0x%x\n", tag); |
811 |
matty |
10 |
} |
812 |
|
|
|
813 |
|
|
s->p = next_tag; |
814 |
|
|
} |
815 |
|
|
} |
816 |
|
|
|
817 |
|
|
/* Receive secure transport packet */ |
818 |
matty |
25 |
STREAM |
819 |
jsorg71 |
733 |
sec_recv(uint8 * rdpver) |
820 |
matty |
10 |
{ |
821 |
|
|
uint32 sec_flags; |
822 |
forsberg |
352 |
uint16 channel; |
823 |
matty |
10 |
STREAM s; |
824 |
|
|
|
825 |
jsorg71 |
733 |
while ((s = mcs_recv(&channel, rdpver)) != NULL) |
826 |
matty |
10 |
{ |
827 |
jsorg71 |
733 |
if (rdpver != NULL) |
828 |
|
|
{ |
829 |
|
|
if (*rdpver != 3) |
830 |
|
|
{ |
831 |
|
|
if (*rdpver & 0x80) |
832 |
|
|
{ |
833 |
|
|
in_uint8s(s, 8); /* signature */ |
834 |
|
|
sec_decrypt(s->p, s->end - s->p); |
835 |
|
|
} |
836 |
|
|
return s; |
837 |
|
|
} |
838 |
|
|
} |
839 |
jsorg71 |
437 |
if (g_encryption || !g_licence_issued) |
840 |
matty |
10 |
{ |
841 |
matty |
28 |
in_uint32_le(s, sec_flags); |
842 |
matty |
10 |
|
843 |
matthewc |
432 |
if (sec_flags & SEC_ENCRYPT) |
844 |
|
|
{ |
845 |
|
|
in_uint8s(s, 8); /* signature */ |
846 |
|
|
sec_decrypt(s->p, s->end - s->p); |
847 |
|
|
} |
848 |
|
|
|
849 |
matty |
28 |
if (sec_flags & SEC_LICENCE_NEG) |
850 |
|
|
{ |
851 |
|
|
licence_process(s); |
852 |
|
|
continue; |
853 |
|
|
} |
854 |
matty |
10 |
} |
855 |
|
|
|
856 |
matthewc |
432 |
if (channel != MCS_GLOBAL_CHANNEL) |
857 |
forsberg |
352 |
{ |
858 |
matthewc |
432 |
channel_process(s, channel); |
859 |
jsorg71 |
779 |
*rdpver = 0xff; |
860 |
|
|
return s; |
861 |
forsberg |
352 |
} |
862 |
|
|
|
863 |
matthewc |
432 |
return s; |
864 |
matty |
10 |
} |
865 |
|
|
|
866 |
|
|
return NULL; |
867 |
|
|
} |
868 |
|
|
|
869 |
|
|
/* Establish a secure connection */ |
870 |
matty |
25 |
BOOL |
871 |
forsberg |
352 |
sec_connect(char *server, char *username) |
872 |
matty |
10 |
{ |
873 |
|
|
struct stream mcs_data; |
874 |
|
|
|
875 |
|
|
/* We exchange some RDP data during the MCS-Connect */ |
876 |
|
|
mcs_data.size = 512; |
877 |
forsberg |
412 |
mcs_data.p = mcs_data.data = (uint8 *) xmalloc(mcs_data.size); |
878 |
matty |
10 |
sec_out_mcs_data(&mcs_data); |
879 |
|
|
|
880 |
forsberg |
352 |
if (!mcs_connect(server, &mcs_data, username)) |
881 |
matty |
10 |
return False; |
882 |
|
|
|
883 |
astrand |
540 |
/* sec_process_mcs_data(&mcs_data); */ |
884 |
jsorg71 |
437 |
if (g_encryption) |
885 |
matty |
28 |
sec_establish_key(); |
886 |
matthewc |
218 |
xfree(mcs_data.data); |
887 |
matty |
10 |
return True; |
888 |
|
|
} |
889 |
|
|
|
890 |
|
|
/* Disconnect a connection */ |
891 |
matty |
25 |
void |
892 |
matthewc |
192 |
sec_disconnect(void) |
893 |
matty |
10 |
{ |
894 |
|
|
mcs_disconnect(); |
895 |
|
|
} |