/[rdesktop]/sourceforge.net/trunk/rdesktop/licence.c
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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revision 61 by matthewc, Sun Jul 14 12:06:03 2002 UTC revision 359 by forsberg, Thu Apr 3 13:52:41 2003 UTC
# Line 1  Line 1 
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
# Line 19  Line 19 
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];
# Line 32  BOOL licence_issued = False; Line 36  BOOL licence_issued = False;
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];
# Line 49  licence_generate_keys(uint8 *client_key, Line 53  licence_generate_keys(uint8 *client_key,
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);
# Line 97  licence_present(uint8 *client_random, ui Line 101  licence_present(uint8 *client_random, ui
101    
102  /* Send a licence request packet */  /* Send a licence request packet */
103  static void  static void
104  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)  
105  {  {
106          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
107          uint16 userlen = strlen(user) + 1;          uint16 userlen = strlen(user) + 1;
# Line 138  static void Line 141  static void
141  licence_process_demand(STREAM s)  licence_process_demand(STREAM s)
142  {  {
143          uint8 null_data[SEC_MODULUS_SIZE];          uint8 null_data[SEC_MODULUS_SIZE];
         uint8 hwid[LICENCE_HWID_SIZE];  
         uint8 signature[LICENCE_SIGNATURE_SIZE];  
144          uint8 *server_random;          uint8 *server_random;
145            uint8 signature[LICENCE_SIGNATURE_SIZE];
146            uint8 hwid[LICENCE_HWID_SIZE];
147          uint8 *licence_data;          uint8 *licence_data;
148          int licence_size;          int licence_size;
149          RC4_KEY crypt_key;          RC4_KEY crypt_key;
# Line 154  licence_process_demand(STREAM s) Line 157  licence_process_demand(STREAM s)
157          licence_generate_keys(null_data, server_random, null_data);          licence_generate_keys(null_data, server_random, null_data);
158    
159          licence_size = load_licence(&licence_data);          licence_size = load_licence(&licence_data);
160          if (licence_size == -1)          if (licence_size != -1)
161          {          {
162                  licence_send_request(null_data, null_data, username, hostname);                  /* Generate a signature for the HWID buffer */
163                    licence_generate_hwid(hwid);
164                    sec_sign(signature, 16, licence_sign_key, 16, hwid, sizeof(hwid));
165    
166                    /* Now encrypt the HWID */
167                    RC4_set_key(&crypt_key, 16, licence_key);
168                    RC4(&crypt_key, sizeof(hwid), hwid, hwid);
169    
170                    licence_present(null_data, null_data, licence_data, licence_size, hwid, signature);
171                    xfree(licence_data);
172                  return;                  return;
173          }          }
174    
175          /* 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);  
176  }  }
177    
178  /* Send an authentication response packet */  /* Send an authentication response packet */
179  static void  static void
180  licence_send_authresp(uint8 *token, uint8 *crypt_hwid, uint8 *signature)  licence_send_authresp(uint8 * token, uint8 * crypt_hwid, uint8 * signature)
181  {  {
182          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
183          uint16 length = 58;          uint16 length = 58;
# Line 202  licence_send_authresp(uint8 *token, uint Line 204  licence_send_authresp(uint8 *token, uint
204    
205  /* Parse an authentication request packet */  /* Parse an authentication request packet */
206  static BOOL  static BOOL
207  licence_parse_authreq(STREAM s, uint8 **token, uint8 **signature)  licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature)
208  {  {
209          uint16 tokenlen;          uint16 tokenlen;
210    
# Line 226  static void Line 228  static void
228  licence_process_authreq(STREAM s)  licence_process_authreq(STREAM s)
229  {  {
230          uint8 *in_token, *in_sig;          uint8 *in_token, *in_sig;
231          uint8 out_token[LICENCE_TOKEN_SIZE],          uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE];
                 decrypt_token[LICENCE_TOKEN_SIZE];  
232          uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];          uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];
233          uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];          uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];
234          uint8 out_sig[LICENCE_SIGNATURE_SIZE];          uint8 out_sig[LICENCE_SIGNATURE_SIZE];
# Line 245  licence_process_authreq(STREAM s) Line 246  licence_process_authreq(STREAM s)
246          licence_generate_hwid(hwid);          licence_generate_hwid(hwid);
247          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);
248          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);
249          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));  
250    
251          /* Now encrypt the HWID */          /* Now encrypt the HWID */
252          RC4_set_key(&crypt_key, 16, licence_key);          RC4_set_key(&crypt_key, 16, licence_key);
# Line 280  licence_process_issue(STREAM s) Line 276  licence_process_issue(STREAM s)
276                  return;                  return;
277    
278          licence_issued = True;          licence_issued = True;
279          save_licence(s->p, length-2);          save_licence(s->p, length - 2);
280  }  }
281    
282  /* Process a licence packet */  /* Process a licence packet */
# Line 295  licence_process(STREAM s) Line 291  licence_process(STREAM s)
291          switch (tag)          switch (tag)
292          {          {
293                  case LICENCE_TAG_DEMAND:                  case LICENCE_TAG_DEMAND:
294                    case LICENCE_TAG_DEMAND_5:
295                          licence_process_demand(s);                          licence_process_demand(s);
296                          break;                          break;
297    
298                  case LICENCE_TAG_AUTHREQ:                  case LICENCE_TAG_AUTHREQ:
299                    case LICENCE_TAG_AUTHREQ_5:
300                          licence_process_authreq(s);                          licence_process_authreq(s);
301                          break;                          break;
302    
303                  case LICENCE_TAG_ISSUE:                  case LICENCE_TAG_ISSUE:
304                    case LICENCE_TAG_ISSUE_5:
305                          licence_process_issue(s);                          licence_process_issue(s);
306                          break;                          break;
307    
308                  case LICENCE_TAG_REISSUE:                  case LICENCE_TAG_REISSUE:
309                    case LICENCE_TAG_REISSUE_5:
310                          break;                          break;
311    
312                  case LICENCE_TAG_RESULT:                  case LICENCE_TAG_RESULT:
313                    case LICENCE_TAG_RESULT_5:
314                          break;                          break;
315    
316                  default:                  default:
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