VirtualBox

source: vbox/trunk/src/VBox/RDP/client/licence.c@ 51770

Last change on this file since 51770 was 37224, checked in by vboxsync, 13 years ago

RDP/client: fix OSE
  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 8.8 KB
Line 
1/* -*- c-basic-offset: 8 -*-
2 rdesktop: A Remote Desktop Protocol client.
3 RDP licensing negotiation
4 Copyright (C) Matthew Chapman <matthewc.unsw.edu.au> 1999-2008
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 3 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, see <http://www.gnu.org/licenses/>.
18*/
19
20/*
21 * Oracle GPL Disclaimer: For the avoidance of doubt, except that if any license choice
22 * other than GPL or LGPL is available it will apply instead, Oracle elects to use only
23 * the General Public License version 2 (GPLv2) at this time for any software where
24 * a choice of GPL license versions is made available with the language indicating
25 * that GPLv2 or any later version may be used, or where a choice of which version
26 * of the GPL is applied is otherwise unspecified.
27 */
28
29#include "rdesktop.h"
30#include "ssl.h"
31
32extern char *g_username;
33extern char g_hostname[16];
34
35static uint8 g_licence_key[16];
36static uint8 g_licence_sign_key[16];
37
38RD_BOOL g_licence_issued = False;
39
40/* Generate a session key and RC4 keys, given client and server randoms */
41static void
42licence_generate_keys(uint8 * client_random, uint8 * server_random, uint8 * pre_master_secret)
43{
44 uint8 master_secret[48];
45 uint8 key_block[48];
46
47 /* Generate master secret and then key material */
48 sec_hash_48(master_secret, pre_master_secret, client_random, server_random, 'A');
49 sec_hash_48(key_block, master_secret, server_random, client_random, 'A');
50
51 /* Store first 16 bytes of session key as MAC secret */
52 memcpy(g_licence_sign_key, key_block, 16);
53
54 /* Generate RC4 key from next 16 bytes */
55 sec_hash_16(g_licence_key, &key_block[16], client_random, server_random);
56}
57
58static void
59licence_generate_hwid(uint8 * hwid)
60{
61 buf_out_uint32(hwid, 2);
62 strncpy((char *) (hwid + 4), g_hostname, LICENCE_HWID_SIZE - 4);
63}
64
65/* Present an existing licence to the server */
66static void
67licence_present(uint8 * client_random, uint8 * rsa_data,
68 uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature)
69{
70 uint32 sec_flags = SEC_LICENCE_NEG;
71 uint16 length =
72 16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE +
73 licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE;
74 STREAM s;
75
76 s = sec_init(sec_flags, length + 4);
77
78 out_uint8(s, LICENCE_TAG_PRESENT);
79 out_uint8(s, 2); /* version */
80 out_uint16_le(s, length);
81
82 out_uint32_le(s, 1);
83 out_uint16(s, 0);
84 out_uint16_le(s, 0x0201);
85
86 out_uint8p(s, client_random, SEC_RANDOM_SIZE);
87 out_uint16(s, 0);
88 out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE));
89 out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);
90 out_uint8s(s, SEC_PADDING_SIZE);
91
92 out_uint16_le(s, 1);
93 out_uint16_le(s, licence_size);
94 out_uint8p(s, licence_data, licence_size);
95
96 out_uint16_le(s, 1);
97 out_uint16_le(s, LICENCE_HWID_SIZE);
98 out_uint8p(s, hwid, LICENCE_HWID_SIZE);
99
100 out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE);
101
102 s_mark_end(s);
103 sec_send(s, sec_flags);
104}
105
106/* Send a licence request packet */
107static void
108licence_send_request(uint8 * client_random, uint8 * rsa_data, char *user, char *host)
109{
110 uint32 sec_flags = SEC_LICENCE_NEG;
111 uint16 userlen = strlen(user) + 1;
112 uint16 hostlen = strlen(host) + 1;
113 uint16 length = 128 + userlen + hostlen;
114 STREAM s;
115
116 s = sec_init(sec_flags, length + 2);
117
118 out_uint8(s, LICENCE_TAG_REQUEST);
119 out_uint8(s, 2); /* version */
120 out_uint16_le(s, length);
121
122 out_uint32_le(s, 1);
123 out_uint16(s, 0);
124 out_uint16_le(s, 0xff01);
125
126 out_uint8p(s, client_random, SEC_RANDOM_SIZE);
127 out_uint16(s, 0);
128 out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE));
129 out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);
130 out_uint8s(s, SEC_PADDING_SIZE);
131
132 out_uint16_le(s, LICENCE_TAG_USER);
133 out_uint16_le(s, userlen);
134 out_uint8p(s, user, userlen);
135
136 out_uint16_le(s, LICENCE_TAG_HOST);
137 out_uint16_le(s, hostlen);
138 out_uint8p(s, host, hostlen);
139
140 s_mark_end(s);
141 sec_send(s, sec_flags);
142}
143
144/* Process a licence demand packet */
145static void
146licence_process_demand(STREAM s)
147{
148 uint8 null_data[SEC_MODULUS_SIZE];
149 uint8 *server_random;
150 uint8 signature[LICENCE_SIGNATURE_SIZE];
151 uint8 hwid[LICENCE_HWID_SIZE];
152 uint8 *licence_data;
153 int licence_size;
154 SSL_RC4 crypt_key;
155
156 /* Retrieve the server random from the incoming packet */
157 in_uint8p(s, server_random, SEC_RANDOM_SIZE);
158
159 /* We currently use null client keys. This is a bit naughty but, hey,
160 the security of licence negotiation isn't exactly paramount. */
161 memset(null_data, 0, sizeof(null_data));
162 licence_generate_keys(null_data, server_random, null_data);
163
164 licence_size = load_licence(&licence_data);
165 if (licence_size > 0)
166 {
167 /* Generate a signature for the HWID buffer */
168 licence_generate_hwid(hwid);
169 sec_sign(signature, 16, g_licence_sign_key, 16, hwid, sizeof(hwid));
170
171 /* Now encrypt the HWID */
172 ssl_rc4_set_key(&crypt_key, g_licence_key, 16);
173 ssl_rc4_crypt(&crypt_key, hwid, hwid, sizeof(hwid));
174
175 licence_present(null_data, null_data, licence_data, licence_size, hwid, signature);
176 xfree(licence_data);
177 return;
178 }
179
180 licence_send_request(null_data, null_data, g_username, g_hostname);
181}
182
183/* Send an authentication response packet */
184static void
185licence_send_authresp(uint8 * token, uint8 * crypt_hwid, uint8 * signature)
186{
187 uint32 sec_flags = SEC_LICENCE_NEG;
188 uint16 length = 58;
189 STREAM s;
190
191 s = sec_init(sec_flags, length + 2);
192
193 out_uint8(s, LICENCE_TAG_AUTHRESP);
194 out_uint8(s, 2); /* version */
195 out_uint16_le(s, length);
196
197 out_uint16_le(s, 1);
198 out_uint16_le(s, LICENCE_TOKEN_SIZE);
199 out_uint8p(s, token, LICENCE_TOKEN_SIZE);
200
201 out_uint16_le(s, 1);
202 out_uint16_le(s, LICENCE_HWID_SIZE);
203 out_uint8p(s, crypt_hwid, LICENCE_HWID_SIZE);
204
205 out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE);
206
207 s_mark_end(s);
208 sec_send(s, sec_flags);
209}
210
211/* Parse an authentication request packet */
212static RD_BOOL
213licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature)
214{
215 uint16 tokenlen;
216
217 in_uint8s(s, 6); /* unknown: f8 3d 15 00 04 f6 */
218
219 in_uint16_le(s, tokenlen);
220 if (tokenlen != LICENCE_TOKEN_SIZE)
221 {
222 error("token len %d\n", tokenlen);
223 return False;
224 }
225
226 in_uint8p(s, *token, tokenlen);
227 in_uint8p(s, *signature, LICENCE_SIGNATURE_SIZE);
228
229 return s_check_end(s);
230}
231
232/* Process an authentication request packet */
233static void
234licence_process_authreq(STREAM s)
235{
236 uint8 *in_token = NULL, *in_sig;
237 uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE];
238 uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];
239 uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];
240 uint8 out_sig[LICENCE_SIGNATURE_SIZE];
241 SSL_RC4 crypt_key;
242
243 /* Parse incoming packet and save the encrypted token */
244 licence_parse_authreq(s, &in_token, &in_sig);
245 memcpy(out_token, in_token, LICENCE_TOKEN_SIZE);
246
247 /* Decrypt the token. It should read TEST in Unicode. */
248 ssl_rc4_set_key(&crypt_key, g_licence_key, 16);
249 ssl_rc4_crypt(&crypt_key, in_token, decrypt_token, LICENCE_TOKEN_SIZE);
250
251 /* Generate a signature for a buffer of token and HWID */
252 licence_generate_hwid(hwid);
253 memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);
254 memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);
255 sec_sign(out_sig, 16, g_licence_sign_key, 16, sealed_buffer, sizeof(sealed_buffer));
256
257 /* Now encrypt the HWID */
258 ssl_rc4_set_key(&crypt_key, g_licence_key, 16);
259 ssl_rc4_crypt(&crypt_key, hwid, crypt_hwid, LICENCE_HWID_SIZE);
260
261 licence_send_authresp(out_token, crypt_hwid, out_sig);
262}
263
264/* Process an licence issue packet */
265static void
266licence_process_issue(STREAM s)
267{
268 SSL_RC4 crypt_key;
269 uint32 length;
270 uint16 check;
271 int i;
272
273 in_uint8s(s, 2); /* 3d 45 - unknown */
274 in_uint16_le(s, length);
275 if (!s_check_rem(s, length))
276 return;
277
278 ssl_rc4_set_key(&crypt_key, g_licence_key, 16);
279 ssl_rc4_crypt(&crypt_key, s->p, s->p, length);
280
281 in_uint16(s, check);
282 if (check != 0)
283 return;
284
285 g_licence_issued = True;
286
287 in_uint8s(s, 2); /* pad */
288
289 /* advance to fourth string */
290 length = 0;
291 for (i = 0; i < 4; i++)
292 {
293 in_uint8s(s, length);
294 in_uint32_le(s, length);
295 if (!s_check_rem(s, length))
296 return;
297 }
298
299 g_licence_issued = True;
300 save_licence(s->p, length);
301}
302
303/* Process a licence packet */
304void
305licence_process(STREAM s)
306{
307 uint8 tag;
308
309 in_uint8(s, tag);
310 in_uint8s(s, 3); /* version, length */
311
312 switch (tag)
313 {
314 case LICENCE_TAG_DEMAND:
315 licence_process_demand(s);
316 break;
317
318 case LICENCE_TAG_AUTHREQ:
319 licence_process_authreq(s);
320 break;
321
322 case LICENCE_TAG_ISSUE:
323 licence_process_issue(s);
324 break;
325
326 case LICENCE_TAG_REISSUE:
327 case LICENCE_TAG_RESULT:
328 break;
329
330 default:
331 unimpl("licence tag 0x%x\n", tag);
332 }
333}
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