1 |
/* |
/* |
2 |
rdesktop: A Remote Desktop Protocol client. |
rdesktop: A Remote Desktop Protocol client. |
3 |
RDP licensing negotiation |
RDP licensing negotiation |
4 |
Copyright (C) Matthew Chapman 1999-2001 |
Copyright (C) Matthew Chapman 1999-2002 |
5 |
|
|
6 |
This program is free software; you can redistribute it and/or modify |
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 |
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 |
the Free Software Foundation; either version 2 of the License, or |
9 |
(at your option) any later version. |
(at your option) any later version. |
10 |
|
|
11 |
This program is distributed in the hope that it will be useful, |
This program is distributed in the hope that it will be useful, |
12 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
19 |
*/ |
*/ |
20 |
|
|
21 |
#include "rdesktop.h" |
#include "rdesktop.h" |
22 |
|
|
23 |
|
#ifdef WITH_OPENSSL |
24 |
|
#include <openssl/rc4.h> |
25 |
|
#else |
26 |
#include "crypto/rc4.h" |
#include "crypto/rc4.h" |
27 |
|
#endif |
28 |
|
|
29 |
extern char username[16]; |
extern char username[16]; |
30 |
extern char hostname[16]; |
extern char hostname[16]; |
|
extern BOOL licence; |
|
31 |
|
|
32 |
static uint8 licence_key[16]; |
static uint8 licence_key[16]; |
33 |
static uint8 licence_sign_key[16]; |
static uint8 licence_sign_key[16]; |
36 |
|
|
37 |
/* Generate a session key and RC4 keys, given client and server randoms */ |
/* Generate a session key and RC4 keys, given client and server randoms */ |
38 |
static void |
static void |
39 |
licence_generate_keys(uint8 *client_key, uint8 *server_key, uint8 *client_rsa) |
licence_generate_keys(uint8 * client_key, uint8 * server_key, uint8 * client_rsa) |
40 |
{ |
{ |
41 |
uint8 session_key[48]; |
uint8 session_key[48]; |
42 |
uint8 temp_hash[48]; |
uint8 temp_hash[48]; |
53 |
} |
} |
54 |
|
|
55 |
static void |
static void |
56 |
licence_generate_hwid(uint8 *hwid) |
licence_generate_hwid(uint8 * hwid) |
57 |
{ |
{ |
58 |
buf_out_uint32(hwid, 2); |
buf_out_uint32(hwid, 2); |
59 |
strncpy(hwid + 4, hostname, LICENCE_HWID_SIZE - 4); |
strncpy((char *) (hwid + 4), hostname, LICENCE_HWID_SIZE - 4); |
60 |
} |
} |
61 |
|
|
62 |
/* Present an existing licence to the server */ |
/* Present an existing licence to the server */ |
63 |
static void |
static void |
64 |
licence_present(uint8 *client_random, uint8 *rsa_data, |
licence_present(uint8 * client_random, uint8 * rsa_data, |
65 |
uint8 *licence_data, int licence_size, |
uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature) |
|
uint8 *hwid, uint8 *signature) |
|
66 |
{ |
{ |
67 |
uint32 sec_flags = SEC_LICENCE_NEG; |
uint32 sec_flags = SEC_LICENCE_NEG; |
68 |
uint16 length = 16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE |
uint16 length = |
69 |
+ licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE; |
16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE + |
70 |
|
licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE; |
71 |
STREAM s; |
STREAM s; |
72 |
|
|
73 |
s = sec_init(sec_flags, length + 4); |
s = sec_init(sec_flags, length + 4); |
74 |
|
|
75 |
out_uint16_le(s, LICENCE_TAG_PRESENT); |
out_uint8(s, LICENCE_TAG_PRESENT); |
76 |
|
out_uint8(s, 2); /* version */ |
77 |
out_uint16_le(s, length); |
out_uint16_le(s, length); |
78 |
|
|
79 |
out_uint32_le(s, 1); |
out_uint32_le(s, 1); |
102 |
|
|
103 |
/* Send a licence request packet */ |
/* Send a licence request packet */ |
104 |
static void |
static void |
105 |
licence_send_request(uint8 *client_random, uint8 *rsa_data, |
licence_send_request(uint8 * client_random, uint8 * rsa_data, char *user, char *host) |
|
char *user, char *host) |
|
106 |
{ |
{ |
107 |
uint32 sec_flags = SEC_LICENCE_NEG; |
uint32 sec_flags = SEC_LICENCE_NEG; |
108 |
uint16 userlen = strlen(user) + 1; |
uint16 userlen = strlen(user) + 1; |
109 |
uint16 hostlen = strlen(host) + 1; |
uint16 hostlen = strlen(host) + 1; |
110 |
uint16 length = 120 + userlen + hostlen; |
uint16 length = 128 + userlen + hostlen; |
111 |
STREAM s; |
STREAM s; |
112 |
|
|
113 |
s = sec_init(sec_flags, length + 2); |
s = sec_init(sec_flags, length + 2); |
114 |
|
|
115 |
out_uint16_le(s, LICENCE_TAG_REQUEST); |
out_uint8(s, LICENCE_TAG_REQUEST); |
116 |
|
out_uint8(s, 2); /* version */ |
117 |
out_uint16_le(s, length); |
out_uint16_le(s, length); |
118 |
|
|
119 |
out_uint32_le(s, 1); |
out_uint32_le(s, 1); |
126 |
out_uint8p(s, rsa_data, SEC_MODULUS_SIZE); |
out_uint8p(s, rsa_data, SEC_MODULUS_SIZE); |
127 |
out_uint8s(s, SEC_PADDING_SIZE); |
out_uint8s(s, SEC_PADDING_SIZE); |
128 |
|
|
129 |
out_uint16(s, LICENCE_TAG_USER); |
out_uint16_le(s, LICENCE_TAG_USER); |
130 |
out_uint16(s, userlen); |
out_uint16_le(s, userlen); |
131 |
out_uint8p(s, user, userlen); |
out_uint8p(s, user, userlen); |
132 |
|
|
133 |
out_uint16(s, LICENCE_TAG_HOST); |
out_uint16_le(s, LICENCE_TAG_HOST); |
134 |
out_uint16(s, hostlen); |
out_uint16_le(s, hostlen); |
135 |
out_uint8p(s, host, hostlen); |
out_uint8p(s, host, hostlen); |
136 |
|
|
137 |
s_mark_end(s); |
s_mark_end(s); |
143 |
licence_process_demand(STREAM s) |
licence_process_demand(STREAM s) |
144 |
{ |
{ |
145 |
uint8 null_data[SEC_MODULUS_SIZE]; |
uint8 null_data[SEC_MODULUS_SIZE]; |
|
uint8 hwid[LICENCE_HWID_SIZE]; |
|
|
uint8 signature[LICENCE_SIGNATURE_SIZE]; |
|
146 |
uint8 *server_random; |
uint8 *server_random; |
147 |
|
uint8 signature[LICENCE_SIGNATURE_SIZE]; |
148 |
|
uint8 hwid[LICENCE_HWID_SIZE]; |
149 |
uint8 *licence_data; |
uint8 *licence_data; |
150 |
int licence_size; |
int licence_size; |
151 |
RC4_KEY crypt_key; |
RC4_KEY crypt_key; |
159 |
licence_generate_keys(null_data, server_random, null_data); |
licence_generate_keys(null_data, server_random, null_data); |
160 |
|
|
161 |
licence_size = load_licence(&licence_data); |
licence_size = load_licence(&licence_data); |
162 |
if (licence_size == -1) |
if (licence_size != -1) |
163 |
{ |
{ |
164 |
licence_send_request(null_data, null_data, username, hostname); |
/* Generate a signature for the HWID buffer */ |
165 |
|
licence_generate_hwid(hwid); |
166 |
|
sec_sign(signature, 16, licence_sign_key, 16, hwid, sizeof(hwid)); |
167 |
|
|
168 |
|
/* Now encrypt the HWID */ |
169 |
|
RC4_set_key(&crypt_key, 16, licence_key); |
170 |
|
RC4(&crypt_key, sizeof(hwid), hwid, hwid); |
171 |
|
|
172 |
|
licence_present(null_data, null_data, licence_data, licence_size, hwid, signature); |
173 |
|
xfree(licence_data); |
174 |
return; |
return; |
175 |
} |
} |
176 |
|
|
177 |
/* Generate a signature for the HWID buffer */ |
licence_send_request(null_data, null_data, username, hostname); |
|
licence_generate_hwid(hwid); |
|
|
sec_sign(signature, licence_sign_key, 16, hwid, sizeof(hwid)); |
|
|
|
|
|
/* Now encrypt the HWID */ |
|
|
RC4_set_key(&crypt_key, 16, licence_key); |
|
|
RC4(&crypt_key, sizeof(hwid), hwid, hwid); |
|
|
|
|
|
licence_present(null_data, null_data, licence_data, licence_size, |
|
|
hwid, signature); |
|
|
xfree(licence_data); |
|
178 |
} |
} |
179 |
|
|
180 |
/* Send an authentication response packet */ |
/* Send an authentication response packet */ |
181 |
static void |
static void |
182 |
licence_send_authresp(uint8 *token, uint8 *crypt_hwid, uint8 *signature) |
licence_send_authresp(uint8 * token, uint8 * crypt_hwid, uint8 * signature) |
183 |
{ |
{ |
184 |
uint32 sec_flags = SEC_LICENCE_NEG; |
uint32 sec_flags = SEC_LICENCE_NEG; |
185 |
uint16 length = 58; |
uint16 length = 58; |
187 |
|
|
188 |
s = sec_init(sec_flags, length + 2); |
s = sec_init(sec_flags, length + 2); |
189 |
|
|
190 |
out_uint16_le(s, LICENCE_TAG_AUTHRESP); |
out_uint8(s, LICENCE_TAG_AUTHRESP); |
191 |
|
out_uint8(s, 2); /* version */ |
192 |
out_uint16_le(s, length); |
out_uint16_le(s, length); |
193 |
|
|
194 |
out_uint16_le(s, 1); |
out_uint16_le(s, 1); |
207 |
|
|
208 |
/* Parse an authentication request packet */ |
/* Parse an authentication request packet */ |
209 |
static BOOL |
static BOOL |
210 |
licence_parse_authreq(STREAM s, uint8 **token, uint8 **signature) |
licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature) |
211 |
{ |
{ |
212 |
uint16 tokenlen; |
uint16 tokenlen; |
213 |
|
|
231 |
licence_process_authreq(STREAM s) |
licence_process_authreq(STREAM s) |
232 |
{ |
{ |
233 |
uint8 *in_token, *in_sig; |
uint8 *in_token, *in_sig; |
234 |
uint8 out_token[LICENCE_TOKEN_SIZE], |
uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE]; |
|
decrypt_token[LICENCE_TOKEN_SIZE]; |
|
235 |
uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE]; |
uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE]; |
236 |
uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE]; |
uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE]; |
237 |
uint8 out_sig[LICENCE_SIGNATURE_SIZE]; |
uint8 out_sig[LICENCE_SIGNATURE_SIZE]; |
249 |
licence_generate_hwid(hwid); |
licence_generate_hwid(hwid); |
250 |
memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE); |
memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE); |
251 |
memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE); |
memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE); |
252 |
sec_sign(out_sig, licence_sign_key, 16, |
sec_sign(out_sig, 16, licence_sign_key, 16, sealed_buffer, sizeof(sealed_buffer)); |
|
sealed_buffer, sizeof(sealed_buffer)); |
|
|
|
|
|
/* Deliberately break signature if licencing disabled */ |
|
|
if (!licence) |
|
|
memset(out_sig, 0, sizeof(out_sig)); |
|
253 |
|
|
254 |
/* Now encrypt the HWID */ |
/* Now encrypt the HWID */ |
255 |
RC4_set_key(&crypt_key, 16, licence_key); |
RC4_set_key(&crypt_key, 16, licence_key); |
279 |
return; |
return; |
280 |
|
|
281 |
licence_issued = True; |
licence_issued = True; |
282 |
save_licence(s->p, length-2); |
save_licence(s->p, length - 2); |
283 |
} |
} |
284 |
|
|
285 |
/* Process a licence packet */ |
/* Process a licence packet */ |
286 |
void |
void |
287 |
licence_process(STREAM s) |
licence_process(STREAM s) |
288 |
{ |
{ |
289 |
uint16 tag; |
uint8 tag; |
290 |
|
|
291 |
in_uint16_le(s, tag); |
in_uint8(s, tag); |
292 |
in_uint8s(s, 2); /* length */ |
in_uint8s(s, 3); /* version, length */ |
293 |
|
|
294 |
switch (tag) |
switch (tag) |
295 |
{ |
{ |
306 |
break; |
break; |
307 |
|
|
308 |
case LICENCE_TAG_REISSUE: |
case LICENCE_TAG_REISSUE: |
|
break; |
|
|
|
|
309 |
case LICENCE_TAG_RESULT: |
case LICENCE_TAG_RESULT: |
310 |
break; |
break; |
311 |
|
|