VirtualBox

source: vbox/trunk/src/VBox/RDP/client/licence.c@ 10753

Last change on this file since 10753 was 9902, checked in by vboxsync, 17 years ago

Added rdesktop 1.6.0.
  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 8.4 KB
Line 
1/* -*- c-basic-offset: 8 -*-
2 rdesktop: A Remote Desktop Protocol client.
3 RDP licensing negotiation
4 Copyright (C) Matthew Chapman 1999-2007
5
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
11 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 "ssl.h"
23
24extern char g_username[64];
25extern char g_hostname[16];
26
27static uint8 g_licence_key[16];
28static uint8 g_licence_sign_key[16];
29
30RD_BOOL g_licence_issued = False;
31
32/* Generate a session key and RC4 keys, given client and server randoms */
33static void
34licence_generate_keys(uint8 * client_random, uint8 * server_random, uint8 * pre_master_secret)
35{
36 uint8 master_secret[48];
37 uint8 key_block[48];
38
39 /* Generate master secret and then key material */
40 sec_hash_48(master_secret, pre_master_secret, client_random, server_random, 'A');
41 sec_hash_48(key_block, master_secret, server_random, client_random, 'A');
42
43 /* Store first 16 bytes of session key as MAC secret */
44 memcpy(g_licence_sign_key, key_block, 16);
45
46 /* Generate RC4 key from next 16 bytes */
47 sec_hash_16(g_licence_key, &key_block[16], client_random, server_random);
48}
49
50static void
51licence_generate_hwid(uint8 * hwid)
52{
53 buf_out_uint32(hwid, 2);
54 strncpy((char *) (hwid + 4), g_hostname, LICENCE_HWID_SIZE - 4);
55}
56
57/* Present an existing licence to the server */
58static void
59licence_present(uint8 * client_random, uint8 * rsa_data,
60 uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature)
61{
62 uint32 sec_flags = SEC_LICENCE_NEG;
63 uint16 length =
64 16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE +
65 licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE;
66 STREAM s;
67
68 s = sec_init(sec_flags, length + 4);
69
70 out_uint8(s, LICENCE_TAG_PRESENT);
71 out_uint8(s, 2); /* version */
72 out_uint16_le(s, length);
73
74 out_uint32_le(s, 1);
75 out_uint16(s, 0);
76 out_uint16_le(s, 0x0201);
77
78 out_uint8p(s, client_random, SEC_RANDOM_SIZE);
79 out_uint16(s, 0);
80 out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE));
81 out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);
82 out_uint8s(s, SEC_PADDING_SIZE);
83
84 out_uint16_le(s, 1);
85 out_uint16_le(s, licence_size);
86 out_uint8p(s, licence_data, licence_size);
87
88 out_uint16_le(s, 1);
89 out_uint16_le(s, LICENCE_HWID_SIZE);
90 out_uint8p(s, hwid, LICENCE_HWID_SIZE);
91
92 out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE);
93
94 s_mark_end(s);
95 sec_send(s, sec_flags);
96}
97
98/* Send a licence request packet */
99static void
100licence_send_request(uint8 * client_random, uint8 * rsa_data, char *user, char *host)
101{
102 uint32 sec_flags = SEC_LICENCE_NEG;
103 uint16 userlen = strlen(user) + 1;
104 uint16 hostlen = strlen(host) + 1;
105 uint16 length = 128 + userlen + hostlen;
106 STREAM s;
107
108 s = sec_init(sec_flags, length + 2);
109
110 out_uint8(s, LICENCE_TAG_REQUEST);
111 out_uint8(s, 2); /* version */
112 out_uint16_le(s, length);
113
114 out_uint32_le(s, 1);
115 out_uint16(s, 0);
116 out_uint16_le(s, 0xff01);
117
118 out_uint8p(s, client_random, SEC_RANDOM_SIZE);
119 out_uint16(s, 0);
120 out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE));
121 out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);
122 out_uint8s(s, SEC_PADDING_SIZE);
123
124 out_uint16_le(s, LICENCE_TAG_USER);
125 out_uint16_le(s, userlen);
126 out_uint8p(s, user, userlen);
127
128 out_uint16_le(s, LICENCE_TAG_HOST);
129 out_uint16_le(s, hostlen);
130 out_uint8p(s, host, hostlen);
131
132 s_mark_end(s);
133 sec_send(s, sec_flags);
134}
135
136/* Process a licence demand packet */
137static void
138licence_process_demand(STREAM s)
139{
140 uint8 null_data[SEC_MODULUS_SIZE];
141 uint8 *server_random;
142 uint8 signature[LICENCE_SIGNATURE_SIZE];
143 uint8 hwid[LICENCE_HWID_SIZE];
144 uint8 *licence_data;
145 int licence_size;
146 SSL_RC4 crypt_key;
147
148 /* Retrieve the server random from the incoming packet */
149 in_uint8p(s, server_random, SEC_RANDOM_SIZE);
150
151 /* We currently use null client keys. This is a bit naughty but, hey,
152 the security of licence negotiation isn't exactly paramount. */
153 memset(null_data, 0, sizeof(null_data));
154 licence_generate_keys(null_data, server_random, null_data);
155
156 licence_size = load_licence(&licence_data);
157 if (licence_size > 0)
158 {
159 /* Generate a signature for the HWID buffer */
160 licence_generate_hwid(hwid);
161 sec_sign(signature, 16, g_licence_sign_key, 16, hwid, sizeof(hwid));
162
163 /* Now encrypt the HWID */
164 ssl_rc4_set_key(&crypt_key, g_licence_key, 16);
165 ssl_rc4_crypt(&crypt_key, hwid, hwid, sizeof(hwid));
166
167 licence_present(null_data, null_data, licence_data, licence_size, hwid, signature);
168 xfree(licence_data);
169 return;
170 }
171
172 licence_send_request(null_data, null_data, g_username, g_hostname);
173}
174
175/* Send an authentication response packet */
176static void
177licence_send_authresp(uint8 * token, uint8 * crypt_hwid, uint8 * signature)
178{
179 uint32 sec_flags = SEC_LICENCE_NEG;
180 uint16 length = 58;
181 STREAM s;
182
183 s = sec_init(sec_flags, length + 2);
184
185 out_uint8(s, LICENCE_TAG_AUTHRESP);
186 out_uint8(s, 2); /* version */
187 out_uint16_le(s, length);
188
189 out_uint16_le(s, 1);
190 out_uint16_le(s, LICENCE_TOKEN_SIZE);
191 out_uint8p(s, token, LICENCE_TOKEN_SIZE);
192
193 out_uint16_le(s, 1);
194 out_uint16_le(s, LICENCE_HWID_SIZE);
195 out_uint8p(s, crypt_hwid, LICENCE_HWID_SIZE);
196
197 out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE);
198
199 s_mark_end(s);
200 sec_send(s, sec_flags);
201}
202
203/* Parse an authentication request packet */
204static RD_BOOL
205licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature)
206{
207 uint16 tokenlen;
208
209 in_uint8s(s, 6); /* unknown: f8 3d 15 00 04 f6 */
210
211 in_uint16_le(s, tokenlen);
212 if (tokenlen != LICENCE_TOKEN_SIZE)
213 {
214 error("token len %d\n", tokenlen);
215 return False;
216 }
217
218 in_uint8p(s, *token, tokenlen);
219 in_uint8p(s, *signature, LICENCE_SIGNATURE_SIZE);
220
221 return s_check_end(s);
222}
223
224/* Process an authentication request packet */
225static void
226licence_process_authreq(STREAM s)
227{
228 uint8 *in_token = NULL, *in_sig;
229 uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE];
230 uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];
231 uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];
232 uint8 out_sig[LICENCE_SIGNATURE_SIZE];
233 SSL_RC4 crypt_key;
234
235 /* Parse incoming packet and save the encrypted token */
236 licence_parse_authreq(s, &in_token, &in_sig);
237 memcpy(out_token, in_token, LICENCE_TOKEN_SIZE);
238
239 /* Decrypt the token. It should read TEST in Unicode. */
240 ssl_rc4_set_key(&crypt_key, g_licence_key, 16);
241 ssl_rc4_crypt(&crypt_key, in_token, decrypt_token, LICENCE_TOKEN_SIZE);
242
243 /* Generate a signature for a buffer of token and HWID */
244 licence_generate_hwid(hwid);
245 memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);
246 memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);
247 sec_sign(out_sig, 16, g_licence_sign_key, 16, sealed_buffer, sizeof(sealed_buffer));
248
249 /* Now encrypt the HWID */
250 ssl_rc4_set_key(&crypt_key, g_licence_key, 16);
251 ssl_rc4_crypt(&crypt_key, hwid, crypt_hwid, LICENCE_HWID_SIZE);
252
253 licence_send_authresp(out_token, crypt_hwid, out_sig);
254}
255
256/* Process an licence issue packet */
257static void
258licence_process_issue(STREAM s)
259{
260 SSL_RC4 crypt_key;
261 uint32 length;
262 uint16 check;
263 int i;
264
265 in_uint8s(s, 2); /* 3d 45 - unknown */
266 in_uint16_le(s, length);
267 if (!s_check_rem(s, length))
268 return;
269
270 ssl_rc4_set_key(&crypt_key, g_licence_key, 16);
271 ssl_rc4_crypt(&crypt_key, s->p, s->p, length);
272
273 in_uint16(s, check);
274 if (check != 0)
275 return;
276
277 g_licence_issued = True;
278
279 in_uint8s(s, 2); /* pad */
280
281 /* advance to fourth string */
282 length = 0;
283 for (i = 0; i < 4; i++)
284 {
285 in_uint8s(s, length);
286 in_uint32_le(s, length);
287 if (!s_check_rem(s, length))
288 return;
289 }
290
291 g_licence_issued = True;
292 save_licence(s->p, length);
293}
294
295/* Process a licence packet */
296void
297licence_process(STREAM s)
298{
299 uint8 tag;
300
301 in_uint8(s, tag);
302 in_uint8s(s, 3); /* version, length */
303
304 switch (tag)
305 {
306 case LICENCE_TAG_DEMAND:
307 licence_process_demand(s);
308 break;
309
310 case LICENCE_TAG_AUTHREQ:
311 licence_process_authreq(s);
312 break;
313
314 case LICENCE_TAG_ISSUE:
315 licence_process_issue(s);
316 break;
317
318 case LICENCE_TAG_REISSUE:
319 case LICENCE_TAG_RESULT:
320 break;
321
322 default:
323 unimpl("licence tag 0x%x\n", tag);
324 }
325}
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