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 |
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, |
licence_generate_keys(uint8 * client_key, uint8 * server_key, uint8 * client_rsa) |
|
uint8 * client_rsa) |
|
40 |
{ |
{ |
41 |
uint8 session_key[48]; |
uint8 session_key[48]; |
42 |
uint8 temp_hash[48]; |
uint8 temp_hash[48]; |
59 |
strncpy((char *) (hwid + 4), hostname, LICENCE_HWID_SIZE - 4); |
strncpy((char *) (hwid + 4), hostname, LICENCE_HWID_SIZE - 4); |
60 |
} |
} |
61 |
|
|
62 |
|
#ifdef SAVE_LICENCE |
63 |
/* Present an existing licence to the server */ |
/* Present an existing licence to the server */ |
64 |
static void |
static void |
65 |
licence_present(uint8 * client_random, uint8 * rsa_data, |
licence_present(uint8 * client_random, uint8 * rsa_data, |
66 |
uint8 * licence_data, int licence_size, |
uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature) |
|
uint8 * hwid, uint8 * signature) |
|
67 |
{ |
{ |
68 |
uint32 sec_flags = SEC_LICENCE_NEG; |
uint32 sec_flags = SEC_LICENCE_NEG; |
69 |
uint16 length = |
uint16 length = |
99 |
s_mark_end(s); |
s_mark_end(s); |
100 |
sec_send(s, sec_flags); |
sec_send(s, sec_flags); |
101 |
} |
} |
102 |
|
#endif |
103 |
|
|
104 |
/* Send a licence request packet */ |
/* Send a licence request packet */ |
105 |
static void |
static void |
106 |
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) |
|
107 |
{ |
{ |
108 |
uint32 sec_flags = SEC_LICENCE_NEG; |
uint32 sec_flags = SEC_LICENCE_NEG; |
109 |
uint16 userlen = strlen(user) + 1; |
uint16 userlen = strlen(user) + 1; |
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 |
|
#ifdef SAVE_LICENCE |
148 |
|
uint8 signature[LICENCE_SIGNATURE_SIZE]; |
149 |
|
uint8 hwid[LICENCE_HWID_SIZE]; |
150 |
uint8 *licence_data; |
uint8 *licence_data; |
151 |
int licence_size; |
int licence_size; |
152 |
RC4_KEY crypt_key; |
RC4_KEY crypt_key; |
153 |
|
#endif |
154 |
|
|
155 |
/* Retrieve the server random from the incoming packet */ |
/* Retrieve the server random from the incoming packet */ |
156 |
in_uint8p(s, server_random, SEC_RANDOM_SIZE); |
in_uint8p(s, server_random, SEC_RANDOM_SIZE); |
160 |
memset(null_data, 0, sizeof(null_data)); |
memset(null_data, 0, sizeof(null_data)); |
161 |
licence_generate_keys(null_data, server_random, null_data); |
licence_generate_keys(null_data, server_random, null_data); |
162 |
|
|
163 |
|
#ifdef SAVE_LICENCE |
164 |
licence_size = load_licence(&licence_data); |
licence_size = load_licence(&licence_data); |
165 |
if (licence_size == -1) |
if (licence_size != -1) |
166 |
{ |
{ |
167 |
licence_send_request(null_data, null_data, username, |
/* Generate a signature for the HWID buffer */ |
168 |
hostname); |
licence_generate_hwid(hwid); |
169 |
|
sec_sign(signature, 16, licence_sign_key, 16, hwid, sizeof(hwid)); |
170 |
|
|
171 |
|
/* Now encrypt the HWID */ |
172 |
|
RC4_set_key(&crypt_key, 16, licence_key); |
173 |
|
RC4(&crypt_key, sizeof(hwid), hwid, hwid); |
174 |
|
|
175 |
|
licence_present(null_data, null_data, licence_data, licence_size, hwid, signature); |
176 |
|
xfree(licence_data); |
177 |
return; |
return; |
178 |
} |
} |
179 |
|
#endif |
180 |
|
|
181 |
/* Generate a signature for the HWID buffer */ |
licence_send_request(null_data, null_data, username, hostname); |
|
licence_generate_hwid(hwid); |
|
|
sec_sign(signature, 16, 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); |
|
182 |
} |
} |
183 |
|
|
184 |
/* Send an authentication response packet */ |
/* Send an authentication response packet */ |
234 |
licence_process_authreq(STREAM s) |
licence_process_authreq(STREAM s) |
235 |
{ |
{ |
236 |
uint8 *in_token, *in_sig; |
uint8 *in_token, *in_sig; |
237 |
uint8 out_token[LICENCE_TOKEN_SIZE], |
uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE]; |
|
decrypt_token[LICENCE_TOKEN_SIZE]; |
|
238 |
uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE]; |
uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE]; |
239 |
uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE]; |
uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE]; |
240 |
uint8 out_sig[LICENCE_SIGNATURE_SIZE]; |
uint8 out_sig[LICENCE_SIGNATURE_SIZE]; |
252 |
licence_generate_hwid(hwid); |
licence_generate_hwid(hwid); |
253 |
memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE); |
memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE); |
254 |
memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE); |
memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE); |
255 |
sec_sign(out_sig, 16, 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)); |
|
256 |
|
|
257 |
/* Now encrypt the HWID */ |
/* Now encrypt the HWID */ |
258 |
RC4_set_key(&crypt_key, 16, licence_key); |
RC4_set_key(&crypt_key, 16, licence_key); |
282 |
return; |
return; |
283 |
|
|
284 |
licence_issued = True; |
licence_issued = True; |
285 |
|
|
286 |
|
#ifdef SAVE_LICENCE |
287 |
save_licence(s->p, length - 2); |
save_licence(s->p, length - 2); |
288 |
|
#endif |
289 |
} |
} |
290 |
|
|
291 |
/* Process a licence packet */ |
/* Process a licence packet */ |