/[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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Diff of /sourceforge.net/trunk/rdesktop/licence.c

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revision 61 by matthewc, Sun Jul 14 12:06:03 2002 UTC revision 214 by matthewc, Sun Oct 6 13:57:39 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 23  Line 23 
23    
24  extern char username[16];  extern char username[16];
25  extern char hostname[16];  extern char hostname[16];
 extern BOOL licence;  
26    
27  static uint8 licence_key[16];  static uint8 licence_key[16];
28  static uint8 licence_sign_key[16];  static uint8 licence_sign_key[16];
# Line 32  BOOL licence_issued = False; Line 31  BOOL licence_issued = False;
31    
32  /* Generate a session key and RC4 keys, given client and server randoms */  /* Generate a session key and RC4 keys, given client and server randoms */
33  static void  static void
34  licence_generate_keys(uint8 *client_key, uint8 *server_key, uint8 *client_rsa)  licence_generate_keys(uint8 * client_key, uint8 * server_key, uint8 * client_rsa)
35  {  {
36          uint8 session_key[48];          uint8 session_key[48];
37          uint8 temp_hash[48];          uint8 temp_hash[48];
# Line 49  licence_generate_keys(uint8 *client_key, Line 48  licence_generate_keys(uint8 *client_key,
48  }  }
49    
50  static void  static void
51  licence_generate_hwid(uint8 *hwid)  licence_generate_hwid(uint8 * hwid)
52  {  {
53          buf_out_uint32(hwid, 2);          buf_out_uint32(hwid, 2);
54          strncpy(hwid + 4, hostname, LICENCE_HWID_SIZE - 4);          strncpy((char *) (hwid + 4), hostname, LICENCE_HWID_SIZE - 4);
55  }  }
56    
57    #ifdef SAVE_LICENCE
58  /* Present an existing licence to the server */  /* Present an existing licence to the server */
59  static void  static void
60  licence_present(uint8 *client_random, uint8 *rsa_data,  licence_present(uint8 * client_random, uint8 * rsa_data,
61                  uint8 *licence_data, int licence_size,                  uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature)
                 uint8 *hwid, uint8 *signature)  
62  {  {
63          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
64          uint16 length = 16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE          uint16 length =
65                          + licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE;                  16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE +
66                    licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE;
67          STREAM s;          STREAM s;
68    
69          s = sec_init(sec_flags, length + 4);          s = sec_init(sec_flags, length + 4);
# Line 94  licence_present(uint8 *client_random, ui Line 94  licence_present(uint8 *client_random, ui
94          s_mark_end(s);          s_mark_end(s);
95          sec_send(s, sec_flags);          sec_send(s, sec_flags);
96  }  }
97    #endif
98    
99  /* Send a licence request packet */  /* Send a licence request packet */
100  static void  static void
101  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)  
102  {  {
103          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
104          uint16 userlen = strlen(user) + 1;          uint16 userlen = strlen(user) + 1;
# Line 138  static void Line 138  static void
138  licence_process_demand(STREAM s)  licence_process_demand(STREAM s)
139  {  {
140          uint8 null_data[SEC_MODULUS_SIZE];          uint8 null_data[SEC_MODULUS_SIZE];
         uint8 hwid[LICENCE_HWID_SIZE];  
         uint8 signature[LICENCE_SIGNATURE_SIZE];  
141          uint8 *server_random;          uint8 *server_random;
142    #ifdef SAVE_LICENCE
143            uint8 signature[LICENCE_SIGNATURE_SIZE];
144            uint8 hwid[LICENCE_HWID_SIZE];
145          uint8 *licence_data;          uint8 *licence_data;
146          int licence_size;          int licence_size;
147          RC4_KEY crypt_key;          RC4_KEY crypt_key;
148    #endif
149    
150          /* Retrieve the server random from the incoming packet */          /* Retrieve the server random from the incoming packet */
151          in_uint8p(s, server_random, SEC_RANDOM_SIZE);          in_uint8p(s, server_random, SEC_RANDOM_SIZE);
# Line 153  licence_process_demand(STREAM s) Line 155  licence_process_demand(STREAM s)
155          memset(null_data, 0, sizeof(null_data));          memset(null_data, 0, sizeof(null_data));
156          licence_generate_keys(null_data, server_random, null_data);          licence_generate_keys(null_data, server_random, null_data);
157    
158    #ifdef SAVE_LICENCE
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    #endif
175    
176          /* 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);  
177  }  }
178    
179  /* Send an authentication response packet */  /* Send an authentication response packet */
180  static void  static void
181  licence_send_authresp(uint8 *token, uint8 *crypt_hwid, uint8 *signature)  licence_send_authresp(uint8 * token, uint8 * crypt_hwid, uint8 * signature)
182  {  {
183          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
184          uint16 length = 58;          uint16 length = 58;
# Line 202  licence_send_authresp(uint8 *token, uint Line 205  licence_send_authresp(uint8 *token, uint
205    
206  /* Parse an authentication request packet */  /* Parse an authentication request packet */
207  static BOOL  static BOOL
208  licence_parse_authreq(STREAM s, uint8 **token, uint8 **signature)  licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature)
209  {  {
210          uint16 tokenlen;          uint16 tokenlen;
211    
# Line 226  static void Line 229  static void
229  licence_process_authreq(STREAM s)  licence_process_authreq(STREAM s)
230  {  {
231          uint8 *in_token, *in_sig;          uint8 *in_token, *in_sig;
232          uint8 out_token[LICENCE_TOKEN_SIZE],          uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE];
                 decrypt_token[LICENCE_TOKEN_SIZE];  
233          uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];          uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];
234          uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];          uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];
235          uint8 out_sig[LICENCE_SIGNATURE_SIZE];          uint8 out_sig[LICENCE_SIGNATURE_SIZE];
# Line 245  licence_process_authreq(STREAM s) Line 247  licence_process_authreq(STREAM s)
247          licence_generate_hwid(hwid);          licence_generate_hwid(hwid);
248          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);
249          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);
250          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));  
251    
252          /* Now encrypt the HWID */          /* Now encrypt the HWID */
253          RC4_set_key(&crypt_key, 16, licence_key);          RC4_set_key(&crypt_key, 16, licence_key);
# Line 280  licence_process_issue(STREAM s) Line 277  licence_process_issue(STREAM s)
277                  return;                  return;
278    
279          licence_issued = True;          licence_issued = True;
280          save_licence(s->p, length-2);  
281    #ifdef SAVE_LICENCE
282            save_licence(s->p, length - 2);
283    #endif
284  }  }
285    
286  /* Process a licence packet */  /* Process a licence packet */
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