/[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 207 by matthewc, Thu Sep 26 14:26:46 2002 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 32  BOOL licence_issued = False; Line 32  BOOL licence_issued = False;
32    
33  /* Generate a session key and RC4 keys, given client and server randoms */  /* Generate a session key and RC4 keys, given client and server randoms */
34  static void  static void
35  licence_generate_keys(uint8 *client_key, uint8 *server_key, uint8 *client_rsa)  licence_generate_keys(uint8 * client_key, uint8 * server_key, uint8 * client_rsa)
36  {  {
37          uint8 session_key[48];          uint8 session_key[48];
38          uint8 temp_hash[48];          uint8 temp_hash[48];
# Line 49  licence_generate_keys(uint8 *client_key, Line 49  licence_generate_keys(uint8 *client_key,
49  }  }
50    
51  static void  static void
52  licence_generate_hwid(uint8 *hwid)  licence_generate_hwid(uint8 * hwid)
53  {  {
54          buf_out_uint32(hwid, 2);          buf_out_uint32(hwid, 2);
55          strncpy(hwid + 4, hostname, LICENCE_HWID_SIZE - 4);          strncpy((char *) (hwid + 4), hostname, LICENCE_HWID_SIZE - 4);
56  }  }
57    
58    #ifdef SAVE_LICENCE
59  /* Present an existing licence to the server */  /* Present an existing licence to the server */
60  static void  static void
61  licence_present(uint8 *client_random, uint8 *rsa_data,  licence_present(uint8 * client_random, uint8 * rsa_data,
62                  uint8 *licence_data, int licence_size,                  uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature)
                 uint8 *hwid, uint8 *signature)  
63  {  {
64          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
65          uint16 length = 16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE          uint16 length =
66                          + licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE;                  16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE +
67                    licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE;
68          STREAM s;          STREAM s;
69    
70          s = sec_init(sec_flags, length + 4);          s = sec_init(sec_flags, length + 4);
# Line 94  licence_present(uint8 *client_random, ui Line 95  licence_present(uint8 *client_random, ui
95          s_mark_end(s);          s_mark_end(s);
96          sec_send(s, sec_flags);          sec_send(s, sec_flags);
97  }  }
98    #endif
99    
100  /* Send a licence request packet */  /* Send a licence request packet */
101  static void  static void
102  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)  
103  {  {
104          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
105          uint16 userlen = strlen(user) + 1;          uint16 userlen = strlen(user) + 1;
# Line 138  static void Line 139  static void
139  licence_process_demand(STREAM s)  licence_process_demand(STREAM s)
140  {  {
141          uint8 null_data[SEC_MODULUS_SIZE];          uint8 null_data[SEC_MODULUS_SIZE];
         uint8 hwid[LICENCE_HWID_SIZE];  
         uint8 signature[LICENCE_SIGNATURE_SIZE];  
142          uint8 *server_random;          uint8 *server_random;
143    #ifdef SAVE_LICENCE
144            uint8 signature[LICENCE_SIGNATURE_SIZE];
145            uint8 hwid[LICENCE_HWID_SIZE];
146          uint8 *licence_data;          uint8 *licence_data;
147          int licence_size;          int licence_size;
148          RC4_KEY crypt_key;          RC4_KEY crypt_key;
149    #endif
150    
151          /* Retrieve the server random from the incoming packet */          /* Retrieve the server random from the incoming packet */
152          in_uint8p(s, server_random, SEC_RANDOM_SIZE);          in_uint8p(s, server_random, SEC_RANDOM_SIZE);
# Line 153  licence_process_demand(STREAM s) Line 156  licence_process_demand(STREAM s)
156          memset(null_data, 0, sizeof(null_data));          memset(null_data, 0, sizeof(null_data));
157          licence_generate_keys(null_data, server_random, null_data);          licence_generate_keys(null_data, server_random, null_data);
158    
159    #ifdef SAVE_LICENCE
160          licence_size = load_licence(&licence_data);          licence_size = load_licence(&licence_data);
161          if (licence_size == -1)          if (licence_size != -1)
162          {          {
163                  licence_send_request(null_data, null_data, username, hostname);                  /* Generate a signature for the HWID buffer */
164                    licence_generate_hwid(hwid);
165                    sec_sign(signature, 16, licence_sign_key, 16, hwid, sizeof(hwid));
166    
167                    /* Now encrypt the HWID */
168                    RC4_set_key(&crypt_key, 16, licence_key);
169                    RC4(&crypt_key, sizeof(hwid), hwid, hwid);
170    
171                    licence_present(null_data, null_data, licence_data, licence_size, hwid, signature);
172                    xfree(licence_data);
173                  return;                  return;
174          }          }
175    #endif
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, 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);  
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;
# Line 202  licence_send_authresp(uint8 *token, uint Line 206  licence_send_authresp(uint8 *token, uint
206    
207  /* Parse an authentication request packet */  /* Parse an authentication request packet */
208  static BOOL  static BOOL
209  licence_parse_authreq(STREAM s, uint8 **token, uint8 **signature)  licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature)
210  {  {
211          uint16 tokenlen;          uint16 tokenlen;
212    
# Line 226  static void Line 230  static void
230  licence_process_authreq(STREAM s)  licence_process_authreq(STREAM s)
231  {  {
232          uint8 *in_token, *in_sig;          uint8 *in_token, *in_sig;
233          uint8 out_token[LICENCE_TOKEN_SIZE],          uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE];
                 decrypt_token[LICENCE_TOKEN_SIZE];  
234          uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];          uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];
235          uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];          uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];
236          uint8 out_sig[LICENCE_SIGNATURE_SIZE];          uint8 out_sig[LICENCE_SIGNATURE_SIZE];
# Line 245  licence_process_authreq(STREAM s) Line 248  licence_process_authreq(STREAM s)
248          licence_generate_hwid(hwid);          licence_generate_hwid(hwid);
249          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);
250          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);
251          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));  
252    
253          /* Deliberately break signature if licencing disabled */          /* Deliberately break signature if licencing disabled */
254          if (!licence)          if (!licence)
# Line 280  licence_process_issue(STREAM s) Line 282  licence_process_issue(STREAM s)
282                  return;                  return;
283    
284          licence_issued = True;          licence_issued = True;
285          save_licence(s->p, length-2);  
286    #ifdef SAVE_LICENCE
287            save_licence(s->p, length - 2);
288    #endif
289  }  }
290    
291  /* Process a licence packet */  /* Process a licence packet */
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