1 |
matty |
10 |
/* |
2 |
|
|
rdesktop: A Remote Desktop Protocol client. |
3 |
|
|
RDP licensing negotiation |
4 |
matty |
30 |
Copyright (C) Matthew Chapman 1999-2001 |
5 |
matty |
10 |
|
6 |
|
|
This program is free software; you can redistribute it and/or modify |
7 |
|
|
it under the terms of the GNU General Public License as published by |
8 |
|
|
the Free Software Foundation; either version 2 of the License, or |
9 |
|
|
(at your option) any later version. |
10 |
jsorg71 |
60 |
|
11 |
matty |
10 |
This program is distributed in the hope that it will be useful, |
12 |
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 |
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 |
|
|
GNU General Public License for more details. |
15 |
|
|
|
16 |
|
|
You should have received a copy of the GNU General Public License |
17 |
|
|
along with this program; if not, write to the Free Software |
18 |
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
19 |
|
|
*/ |
20 |
|
|
|
21 |
|
|
#include "rdesktop.h" |
22 |
|
|
#include "crypto/rc4.h" |
23 |
|
|
|
24 |
|
|
extern char username[16]; |
25 |
|
|
extern char hostname[16]; |
26 |
|
|
extern BOOL licence; |
27 |
|
|
|
28 |
|
|
static uint8 licence_key[16]; |
29 |
|
|
static uint8 licence_sign_key[16]; |
30 |
|
|
|
31 |
matty |
28 |
BOOL licence_issued = False; |
32 |
|
|
|
33 |
matty |
10 |
/* Generate a session key and RC4 keys, given client and server randoms */ |
34 |
matthewc |
39 |
static void |
35 |
astrand |
64 |
licence_generate_keys(uint8 * client_key, uint8 * server_key, |
36 |
|
|
uint8 * client_rsa) |
37 |
matty |
10 |
{ |
38 |
|
|
uint8 session_key[48]; |
39 |
|
|
uint8 temp_hash[48]; |
40 |
|
|
|
41 |
|
|
/* Generate session key - two rounds of sec_hash_48 */ |
42 |
matty |
24 |
sec_hash_48(temp_hash, client_rsa, client_key, server_key, 65); |
43 |
|
|
sec_hash_48(session_key, temp_hash, server_key, client_key, 65); |
44 |
matty |
10 |
|
45 |
|
|
/* Store first 16 bytes of session key, for generating signatures */ |
46 |
matty |
24 |
memcpy(licence_sign_key, session_key, 16); |
47 |
matty |
10 |
|
48 |
|
|
/* Generate RC4 key */ |
49 |
|
|
sec_hash_16(licence_key, &session_key[16], client_key, server_key); |
50 |
|
|
} |
51 |
|
|
|
52 |
matthewc |
39 |
static void |
53 |
astrand |
64 |
licence_generate_hwid(uint8 * hwid) |
54 |
matthewc |
39 |
{ |
55 |
|
|
buf_out_uint32(hwid, 2); |
56 |
|
|
strncpy(hwid + 4, hostname, LICENCE_HWID_SIZE - 4); |
57 |
|
|
} |
58 |
|
|
|
59 |
|
|
/* Present an existing licence to the server */ |
60 |
|
|
static void |
61 |
astrand |
64 |
licence_present(uint8 * client_random, uint8 * rsa_data, |
62 |
|
|
uint8 * licence_data, int licence_size, |
63 |
|
|
uint8 * hwid, uint8 * signature) |
64 |
matthewc |
39 |
{ |
65 |
|
|
uint32 sec_flags = SEC_LICENCE_NEG; |
66 |
astrand |
64 |
uint16 length = |
67 |
|
|
16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE + |
68 |
|
|
licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE; |
69 |
matthewc |
39 |
STREAM s; |
70 |
|
|
|
71 |
|
|
s = sec_init(sec_flags, length + 4); |
72 |
|
|
|
73 |
|
|
out_uint16_le(s, LICENCE_TAG_PRESENT); |
74 |
|
|
out_uint16_le(s, length); |
75 |
|
|
|
76 |
|
|
out_uint32_le(s, 1); |
77 |
|
|
out_uint16(s, 0); |
78 |
|
|
out_uint16_le(s, 0x0201); |
79 |
|
|
|
80 |
|
|
out_uint8p(s, client_random, SEC_RANDOM_SIZE); |
81 |
|
|
out_uint16(s, 0); |
82 |
|
|
out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE)); |
83 |
|
|
out_uint8p(s, rsa_data, SEC_MODULUS_SIZE); |
84 |
|
|
out_uint8s(s, SEC_PADDING_SIZE); |
85 |
|
|
|
86 |
|
|
out_uint16_le(s, 1); |
87 |
|
|
out_uint16_le(s, licence_size); |
88 |
|
|
out_uint8p(s, licence_data, licence_size); |
89 |
|
|
|
90 |
|
|
out_uint16_le(s, 1); |
91 |
|
|
out_uint16_le(s, LICENCE_HWID_SIZE); |
92 |
|
|
out_uint8p(s, hwid, LICENCE_HWID_SIZE); |
93 |
|
|
|
94 |
|
|
out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE); |
95 |
|
|
|
96 |
|
|
s_mark_end(s); |
97 |
|
|
sec_send(s, sec_flags); |
98 |
|
|
} |
99 |
|
|
|
100 |
matty |
10 |
/* Send a licence request packet */ |
101 |
matty |
25 |
static void |
102 |
astrand |
64 |
licence_send_request(uint8 * client_random, uint8 * rsa_data, |
103 |
matty |
25 |
char *user, char *host) |
104 |
matty |
10 |
{ |
105 |
|
|
uint32 sec_flags = SEC_LICENCE_NEG; |
106 |
|
|
uint16 userlen = strlen(user) + 1; |
107 |
|
|
uint16 hostlen = strlen(host) + 1; |
108 |
jsorg71 |
60 |
uint16 length = 128 + userlen + hostlen; |
109 |
matty |
10 |
STREAM s; |
110 |
|
|
|
111 |
|
|
s = sec_init(sec_flags, length + 2); |
112 |
|
|
|
113 |
|
|
out_uint16_le(s, LICENCE_TAG_REQUEST); |
114 |
|
|
out_uint16_le(s, length); |
115 |
|
|
|
116 |
|
|
out_uint32_le(s, 1); |
117 |
matthewc |
39 |
out_uint16(s, 0); |
118 |
|
|
out_uint16_le(s, 0xff01); |
119 |
matty |
10 |
|
120 |
|
|
out_uint8p(s, client_random, SEC_RANDOM_SIZE); |
121 |
|
|
out_uint16(s, 0); |
122 |
|
|
out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE)); |
123 |
|
|
out_uint8p(s, rsa_data, SEC_MODULUS_SIZE); |
124 |
|
|
out_uint8s(s, SEC_PADDING_SIZE); |
125 |
|
|
|
126 |
|
|
out_uint16(s, LICENCE_TAG_USER); |
127 |
|
|
out_uint16(s, userlen); |
128 |
|
|
out_uint8p(s, user, userlen); |
129 |
|
|
|
130 |
|
|
out_uint16(s, LICENCE_TAG_HOST); |
131 |
|
|
out_uint16(s, hostlen); |
132 |
|
|
out_uint8p(s, host, hostlen); |
133 |
|
|
|
134 |
|
|
s_mark_end(s); |
135 |
|
|
sec_send(s, sec_flags); |
136 |
|
|
} |
137 |
|
|
|
138 |
|
|
/* Process a licence demand packet */ |
139 |
matty |
25 |
static void |
140 |
|
|
licence_process_demand(STREAM s) |
141 |
matty |
10 |
{ |
142 |
|
|
uint8 null_data[SEC_MODULUS_SIZE]; |
143 |
matthewc |
39 |
uint8 hwid[LICENCE_HWID_SIZE]; |
144 |
|
|
uint8 signature[LICENCE_SIGNATURE_SIZE]; |
145 |
matty |
10 |
uint8 *server_random; |
146 |
matthewc |
39 |
uint8 *licence_data; |
147 |
|
|
int licence_size; |
148 |
|
|
RC4_KEY crypt_key; |
149 |
matty |
10 |
|
150 |
|
|
/* Retrieve the server random from the incoming packet */ |
151 |
|
|
in_uint8p(s, server_random, SEC_RANDOM_SIZE); |
152 |
|
|
|
153 |
|
|
/* We currently use null client keys. This is a bit naughty but, hey, |
154 |
|
|
the security of licence negotiation isn't exactly paramount. */ |
155 |
|
|
memset(null_data, 0, sizeof(null_data)); |
156 |
|
|
licence_generate_keys(null_data, server_random, null_data); |
157 |
|
|
|
158 |
matthewc |
39 |
licence_size = load_licence(&licence_data); |
159 |
|
|
if (licence_size == -1) |
160 |
|
|
{ |
161 |
astrand |
64 |
licence_send_request(null_data, null_data, username, |
162 |
|
|
hostname); |
163 |
matthewc |
39 |
return; |
164 |
|
|
} |
165 |
|
|
|
166 |
|
|
/* Generate a signature for the HWID buffer */ |
167 |
|
|
licence_generate_hwid(hwid); |
168 |
matthewc |
61 |
sec_sign(signature, 16, licence_sign_key, 16, hwid, sizeof(hwid)); |
169 |
matthewc |
39 |
|
170 |
|
|
/* Now encrypt the HWID */ |
171 |
|
|
RC4_set_key(&crypt_key, 16, licence_key); |
172 |
|
|
RC4(&crypt_key, sizeof(hwid), hwid, hwid); |
173 |
|
|
|
174 |
|
|
licence_present(null_data, null_data, licence_data, licence_size, |
175 |
astrand |
64 |
hwid, signature); |
176 |
matthewc |
39 |
xfree(licence_data); |
177 |
matty |
10 |
} |
178 |
|
|
|
179 |
|
|
/* Send an authentication response packet */ |
180 |
matty |
25 |
static void |
181 |
astrand |
64 |
licence_send_authresp(uint8 * token, uint8 * crypt_hwid, uint8 * signature) |
182 |
matty |
10 |
{ |
183 |
|
|
uint32 sec_flags = SEC_LICENCE_NEG; |
184 |
|
|
uint16 length = 58; |
185 |
|
|
STREAM s; |
186 |
|
|
|
187 |
|
|
s = sec_init(sec_flags, length + 2); |
188 |
|
|
|
189 |
|
|
out_uint16_le(s, LICENCE_TAG_AUTHRESP); |
190 |
|
|
out_uint16_le(s, length); |
191 |
|
|
|
192 |
|
|
out_uint16_le(s, 1); |
193 |
|
|
out_uint16_le(s, LICENCE_TOKEN_SIZE); |
194 |
|
|
out_uint8p(s, token, LICENCE_TOKEN_SIZE); |
195 |
|
|
|
196 |
|
|
out_uint16_le(s, 1); |
197 |
|
|
out_uint16_le(s, LICENCE_HWID_SIZE); |
198 |
|
|
out_uint8p(s, crypt_hwid, LICENCE_HWID_SIZE); |
199 |
|
|
|
200 |
|
|
out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE); |
201 |
|
|
|
202 |
|
|
s_mark_end(s); |
203 |
|
|
sec_send(s, sec_flags); |
204 |
|
|
} |
205 |
|
|
|
206 |
|
|
/* Parse an authentication request packet */ |
207 |
matty |
25 |
static BOOL |
208 |
astrand |
64 |
licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature) |
209 |
matty |
10 |
{ |
210 |
|
|
uint16 tokenlen; |
211 |
|
|
|
212 |
matty |
24 |
in_uint8s(s, 6); /* unknown: f8 3d 15 00 04 f6 */ |
213 |
matty |
10 |
|
214 |
|
|
in_uint16_le(s, tokenlen); |
215 |
|
|
if (tokenlen != LICENCE_TOKEN_SIZE) |
216 |
|
|
{ |
217 |
matty |
30 |
error("token len %d\n", tokenlen); |
218 |
matty |
10 |
return False; |
219 |
|
|
} |
220 |
|
|
|
221 |
|
|
in_uint8p(s, *token, tokenlen); |
222 |
|
|
in_uint8p(s, *signature, LICENCE_SIGNATURE_SIZE); |
223 |
|
|
|
224 |
|
|
return s_check_end(s); |
225 |
|
|
} |
226 |
|
|
|
227 |
|
|
/* Process an authentication request packet */ |
228 |
matty |
25 |
static void |
229 |
|
|
licence_process_authreq(STREAM s) |
230 |
matty |
10 |
{ |
231 |
|
|
uint8 *in_token, *in_sig; |
232 |
matty |
24 |
uint8 out_token[LICENCE_TOKEN_SIZE], |
233 |
|
|
decrypt_token[LICENCE_TOKEN_SIZE]; |
234 |
matty |
10 |
uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE]; |
235 |
|
|
uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE]; |
236 |
|
|
uint8 out_sig[LICENCE_SIGNATURE_SIZE]; |
237 |
|
|
RC4_KEY crypt_key; |
238 |
|
|
|
239 |
|
|
/* Parse incoming packet and save the encrypted token */ |
240 |
|
|
licence_parse_authreq(s, &in_token, &in_sig); |
241 |
|
|
memcpy(out_token, in_token, LICENCE_TOKEN_SIZE); |
242 |
|
|
|
243 |
|
|
/* Decrypt the token. It should read TEST in Unicode. */ |
244 |
|
|
RC4_set_key(&crypt_key, 16, licence_key); |
245 |
|
|
RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token); |
246 |
|
|
|
247 |
|
|
/* Generate a signature for a buffer of token and HWID */ |
248 |
matthewc |
39 |
licence_generate_hwid(hwid); |
249 |
matty |
10 |
memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE); |
250 |
|
|
memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE); |
251 |
matthewc |
61 |
sec_sign(out_sig, 16, licence_sign_key, 16, |
252 |
matty |
24 |
sealed_buffer, sizeof(sealed_buffer)); |
253 |
matty |
10 |
|
254 |
|
|
/* Deliberately break signature if licencing disabled */ |
255 |
|
|
if (!licence) |
256 |
|
|
memset(out_sig, 0, sizeof(out_sig)); |
257 |
|
|
|
258 |
|
|
/* Now encrypt the HWID */ |
259 |
|
|
RC4_set_key(&crypt_key, 16, licence_key); |
260 |
|
|
RC4(&crypt_key, LICENCE_HWID_SIZE, hwid, crypt_hwid); |
261 |
|
|
|
262 |
|
|
licence_send_authresp(out_token, crypt_hwid, out_sig); |
263 |
|
|
} |
264 |
|
|
|
265 |
|
|
/* Process an licence issue packet */ |
266 |
matty |
25 |
static void |
267 |
|
|
licence_process_issue(STREAM s) |
268 |
matty |
10 |
{ |
269 |
|
|
RC4_KEY crypt_key; |
270 |
|
|
uint32 length; |
271 |
|
|
uint16 check; |
272 |
|
|
|
273 |
matty |
24 |
in_uint8s(s, 2); /* 3d 45 - unknown */ |
274 |
matty |
10 |
in_uint16_le(s, length); |
275 |
|
|
if (!s_check_rem(s, length)) |
276 |
|
|
return; |
277 |
|
|
|
278 |
|
|
RC4_set_key(&crypt_key, 16, licence_key); |
279 |
|
|
RC4(&crypt_key, length, s->p, s->p); |
280 |
|
|
|
281 |
|
|
in_uint16(s, check); |
282 |
|
|
if (check != 0) |
283 |
|
|
return; |
284 |
|
|
|
285 |
matty |
28 |
licence_issued = True; |
286 |
astrand |
64 |
save_licence(s->p, length - 2); |
287 |
matty |
10 |
} |
288 |
|
|
|
289 |
|
|
/* Process a licence packet */ |
290 |
matty |
25 |
void |
291 |
|
|
licence_process(STREAM s) |
292 |
matty |
10 |
{ |
293 |
|
|
uint16 tag; |
294 |
|
|
|
295 |
|
|
in_uint16_le(s, tag); |
296 |
matty |
24 |
in_uint8s(s, 2); /* length */ |
297 |
matty |
10 |
|
298 |
|
|
switch (tag) |
299 |
|
|
{ |
300 |
|
|
case LICENCE_TAG_DEMAND: |
301 |
|
|
licence_process_demand(s); |
302 |
|
|
break; |
303 |
|
|
|
304 |
|
|
case LICENCE_TAG_AUTHREQ: |
305 |
|
|
licence_process_authreq(s); |
306 |
|
|
break; |
307 |
|
|
|
308 |
|
|
case LICENCE_TAG_ISSUE: |
309 |
|
|
licence_process_issue(s); |
310 |
|
|
break; |
311 |
|
|
|
312 |
matthewc |
39 |
case LICENCE_TAG_REISSUE: |
313 |
|
|
break; |
314 |
|
|
|
315 |
matty |
10 |
case LICENCE_TAG_RESULT: |
316 |
|
|
break; |
317 |
|
|
|
318 |
|
|
default: |
319 |
matty |
30 |
unimpl("licence tag 0x%x\n", tag); |
320 |
matty |
10 |
} |
321 |
|
|
} |