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source: vbox/trunk/src/VBox/RDP/client/licence.c@ 35532

Last change on this file since 35532 was 33656, checked in by vboxsync, 14 years ago

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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/*
22 * Oracle GPL Disclaimer: For the avoidance of doubt, except that if any license choice
23 * other than GPL or LGPL is available it will apply instead, Oracle elects to use only
24 * the General Public License version 2 (GPLv2) at this time for any software where
25 * a choice of GPL license versions is made available with the language indicating
26 * that GPLv2 or any later version may be used, or where a choice of which version
27 * of the GPL is applied is otherwise unspecified.
28 */
29
30#include "rdesktop.h"
31#include "ssl.h"
32
33extern char g_username[64];
34extern char g_hostname[16];
35
36static uint8 g_licence_key[16];
37static uint8 g_licence_sign_key[16];
38
39RD_BOOL g_licence_issued = False;
40
41/* Generate a session key and RC4 keys, given client and server randoms */
42static void
43licence_generate_keys(uint8 * client_random, uint8 * server_random, uint8 * pre_master_secret)
44{
45 uint8 master_secret[48];
46 uint8 key_block[48];
47
48 /* Generate master secret and then key material */
49 sec_hash_48(master_secret, pre_master_secret, client_random, server_random, 'A');
50 sec_hash_48(key_block, master_secret, server_random, client_random, 'A');
51
52 /* Store first 16 bytes of session key as MAC secret */
53 memcpy(g_licence_sign_key, key_block, 16);
54
55 /* Generate RC4 key from next 16 bytes */
56 sec_hash_16(g_licence_key, &key_block[16], client_random, server_random);
57}
58
59static void
60licence_generate_hwid(uint8 * hwid)
61{
62 buf_out_uint32(hwid, 2);
63 strncpy((char *) (hwid + 4), g_hostname, LICENCE_HWID_SIZE - 4);
64}
65
66/* Present an existing licence to the server */
67static void
68licence_present(uint8 * client_random, uint8 * rsa_data,
69 uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature)
70{
71 uint32 sec_flags = SEC_LICENCE_NEG;
72 uint16 length =
73 16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE +
74 licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE;
75 STREAM s;
76
77 s = sec_init(sec_flags, length + 4);
78
79 out_uint8(s, LICENCE_TAG_PRESENT);
80 out_uint8(s, 2); /* version */
81 out_uint16_le(s, length);
82
83 out_uint32_le(s, 1);
84 out_uint16(s, 0);
85 out_uint16_le(s, 0x0201);
86
87 out_uint8p(s, client_random, SEC_RANDOM_SIZE);
88 out_uint16(s, 0);
89 out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE));
90 out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);
91 out_uint8s(s, SEC_PADDING_SIZE);
92
93 out_uint16_le(s, 1);
94 out_uint16_le(s, licence_size);
95 out_uint8p(s, licence_data, licence_size);
96
97 out_uint16_le(s, 1);
98 out_uint16_le(s, LICENCE_HWID_SIZE);
99 out_uint8p(s, hwid, LICENCE_HWID_SIZE);
100
101 out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE);
102
103 s_mark_end(s);
104 sec_send(s, sec_flags);
105}
106
107/* Send a licence request packet */
108static void
109licence_send_request(uint8 * client_random, uint8 * rsa_data, char *user, char *host)
110{
111 uint32 sec_flags = SEC_LICENCE_NEG;
112 uint16 userlen = strlen(user) + 1;
113 uint16 hostlen = strlen(host) + 1;
114 uint16 length = 128 + userlen + hostlen;
115 STREAM s;
116
117 s = sec_init(sec_flags, length + 2);
118
119 out_uint8(s, LICENCE_TAG_REQUEST);
120 out_uint8(s, 2); /* version */
121 out_uint16_le(s, length);
122
123 out_uint32_le(s, 1);
124 out_uint16(s, 0);
125 out_uint16_le(s, 0xff01);
126
127 out_uint8p(s, client_random, SEC_RANDOM_SIZE);
128 out_uint16(s, 0);
129 out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE));
130 out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);
131 out_uint8s(s, SEC_PADDING_SIZE);
132
133 out_uint16_le(s, LICENCE_TAG_USER);
134 out_uint16_le(s, userlen);
135 out_uint8p(s, user, userlen);
136
137 out_uint16_le(s, LICENCE_TAG_HOST);
138 out_uint16_le(s, hostlen);
139 out_uint8p(s, host, hostlen);
140
141 s_mark_end(s);
142 sec_send(s, sec_flags);
143}
144
145/* Process a licence demand packet */
146static void
147licence_process_demand(STREAM s)
148{
149 uint8 null_data[SEC_MODULUS_SIZE];
150 uint8 *server_random;
151 uint8 signature[LICENCE_SIGNATURE_SIZE];
152 uint8 hwid[LICENCE_HWID_SIZE];
153 uint8 *licence_data;
154 int licence_size;
155 SSL_RC4 crypt_key;
156
157 /* Retrieve the server random from the incoming packet */
158 in_uint8p(s, server_random, SEC_RANDOM_SIZE);
159
160 /* We currently use null client keys. This is a bit naughty but, hey,
161 the security of licence negotiation isn't exactly paramount. */
162 memset(null_data, 0, sizeof(null_data));
163 licence_generate_keys(null_data, server_random, null_data);
164
165 licence_size = load_licence(&licence_data);
166 if (licence_size > 0)
167 {
168 /* Generate a signature for the HWID buffer */
169 licence_generate_hwid(hwid);
170 sec_sign(signature, 16, g_licence_sign_key, 16, hwid, sizeof(hwid));
171
172 /* Now encrypt the HWID */
173 ssl_rc4_set_key(&crypt_key, g_licence_key, 16);
174 ssl_rc4_crypt(&crypt_key, hwid, hwid, sizeof(hwid));
175
176 licence_present(null_data, null_data, licence_data, licence_size, hwid, signature);
177 xfree(licence_data);
178 return;
179 }
180
181 licence_send_request(null_data, null_data, g_username, g_hostname);
182}
183
184/* Send an authentication response packet */
185static void
186licence_send_authresp(uint8 * token, uint8 * crypt_hwid, uint8 * signature)
187{
188 uint32 sec_flags = SEC_LICENCE_NEG;
189 uint16 length = 58;
190 STREAM s;
191
192 s = sec_init(sec_flags, length + 2);
193
194 out_uint8(s, LICENCE_TAG_AUTHRESP);
195 out_uint8(s, 2); /* version */
196 out_uint16_le(s, length);
197
198 out_uint16_le(s, 1);
199 out_uint16_le(s, LICENCE_TOKEN_SIZE);
200 out_uint8p(s, token, LICENCE_TOKEN_SIZE);
201
202 out_uint16_le(s, 1);
203 out_uint16_le(s, LICENCE_HWID_SIZE);
204 out_uint8p(s, crypt_hwid, LICENCE_HWID_SIZE);
205
206 out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE);
207
208 s_mark_end(s);
209 sec_send(s, sec_flags);
210}
211
212/* Parse an authentication request packet */
213static RD_BOOL
214licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature)
215{
216 uint16 tokenlen;
217
218 in_uint8s(s, 6); /* unknown: f8 3d 15 00 04 f6 */
219
220 in_uint16_le(s, tokenlen);
221 if (tokenlen != LICENCE_TOKEN_SIZE)
222 {
223 error("token len %d\n", tokenlen);
224 return False;
225 }
226
227 in_uint8p(s, *token, tokenlen);
228 in_uint8p(s, *signature, LICENCE_SIGNATURE_SIZE);
229
230 return s_check_end(s);
231}
232
233/* Process an authentication request packet */
234static void
235licence_process_authreq(STREAM s)
236{
237 uint8 *in_token = NULL, *in_sig;
238 uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE];
239 uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];
240 uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];
241 uint8 out_sig[LICENCE_SIGNATURE_SIZE];
242 SSL_RC4 crypt_key;
243
244 /* Parse incoming packet and save the encrypted token */
245 licence_parse_authreq(s, &in_token, &in_sig);
246 memcpy(out_token, in_token, LICENCE_TOKEN_SIZE);
247
248 /* Decrypt the token. It should read TEST in Unicode. */
249 ssl_rc4_set_key(&crypt_key, g_licence_key, 16);
250 ssl_rc4_crypt(&crypt_key, in_token, decrypt_token, LICENCE_TOKEN_SIZE);
251
252 /* Generate a signature for a buffer of token and HWID */
253 licence_generate_hwid(hwid);
254 memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);
255 memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);
256 sec_sign(out_sig, 16, g_licence_sign_key, 16, sealed_buffer, sizeof(sealed_buffer));
257
258 /* Now encrypt the HWID */
259 ssl_rc4_set_key(&crypt_key, g_licence_key, 16);
260 ssl_rc4_crypt(&crypt_key, hwid, crypt_hwid, LICENCE_HWID_SIZE);
261
262 licence_send_authresp(out_token, crypt_hwid, out_sig);
263}
264
265/* Process an licence issue packet */
266static void
267licence_process_issue(STREAM s)
268{
269 SSL_RC4 crypt_key;
270 uint32 length;
271 uint16 check;
272 int i;
273
274 in_uint8s(s, 2); /* 3d 45 - unknown */
275 in_uint16_le(s, length);
276 if (!s_check_rem(s, length))
277 return;
278
279 ssl_rc4_set_key(&crypt_key, g_licence_key, 16);
280 ssl_rc4_crypt(&crypt_key, s->p, s->p, length);
281
282 in_uint16(s, check);
283 if (check != 0)
284 return;
285
286 g_licence_issued = True;
287
288 in_uint8s(s, 2); /* pad */
289
290 /* advance to fourth string */
291 length = 0;
292 for (i = 0; i < 4; i++)
293 {
294 in_uint8s(s, length);
295 in_uint32_le(s, length);
296 if (!s_check_rem(s, length))
297 return;
298 }
299
300 g_licence_issued = True;
301 save_licence(s->p, length);
302}
303
304/* Process a licence packet */
305void
306licence_process(STREAM s)
307{
308 uint8 tag;
309
310 in_uint8(s, tag);
311 in_uint8s(s, 3); /* version, length */
312
313 switch (tag)
314 {
315 case LICENCE_TAG_DEMAND:
316 licence_process_demand(s);
317 break;
318
319 case LICENCE_TAG_AUTHREQ:
320 licence_process_authreq(s);
321 break;
322
323 case LICENCE_TAG_ISSUE:
324 licence_process_issue(s);
325 break;
326
327 case LICENCE_TAG_REISSUE:
328 case LICENCE_TAG_RESULT:
329 break;
330
331 default:
332 unimpl("licence tag 0x%x\n", tag);
333 }
334}
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