/[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 367 by matthewc, Wed Apr 16 13:04:15 2003 UTC revision 740 by astrand, Sat Jul 31 13:07:41 2004 UTC
# Line 19  Line 19 
19  */  */
20    
21  #include "rdesktop.h"  #include "rdesktop.h"
   
 #ifdef WITH_OPENSSL  
22  #include <openssl/rc4.h>  #include <openssl/rc4.h>
 #else  
 #include "crypto/rc4.h"  
 #endif  
23    
24  extern char username[16];  extern char g_username[16];
25  extern char hostname[16];  extern char g_hostname[16];
26    
27  static uint8 licence_key[16];  static uint8 g_licence_key[16];
28  static uint8 licence_sign_key[16];  static uint8 g_licence_sign_key[16];
29    
30  BOOL licence_issued = False;  BOOL g_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_random, uint8 * server_random, uint8 * pre_master_secret)
35  {  {
36          uint8 session_key[48];          uint8 master_secret[48];
37          uint8 temp_hash[48];          uint8 key_block[48];
38    
39          /* Generate session key - two rounds of sec_hash_48 */          /* Generate master secret and then key material */
40          sec_hash_48(temp_hash, client_rsa, client_key, server_key, 65);          sec_hash_48(master_secret, pre_master_secret, client_random, server_random, 'A');
41          sec_hash_48(session_key, temp_hash, server_key, client_key, 65);          sec_hash_48(key_block, master_secret, server_random, client_random, 'A');
42    
43          /* Store first 16 bytes of session key, for generating signatures */          /* Store first 16 bytes of session key as MAC secret */
44          memcpy(licence_sign_key, session_key, 16);          memcpy(g_licence_sign_key, key_block, 16);
45    
46          /* Generate RC4 key */          /* Generate RC4 key from next 16 bytes */
47          sec_hash_16(licence_key, &session_key[16], client_key, server_key);          sec_hash_16(g_licence_key, &key_block[16], client_random, server_random);
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((char *) (hwid + 4), hostname, LICENCE_HWID_SIZE - 4);          strncpy((char *) (hwid + 4), g_hostname, LICENCE_HWID_SIZE - 4);
55  }  }
56    
57  /* Present an existing licence to the server */  /* Present an existing licence to the server */
# Line 73  licence_present(uint8 * client_random, u Line 68  licence_present(uint8 * client_random, u
68          s = sec_init(sec_flags, length + 4);          s = sec_init(sec_flags, length + 4);
69    
70          out_uint8(s, LICENCE_TAG_PRESENT);          out_uint8(s, LICENCE_TAG_PRESENT);
71          out_uint8(s, 2); /* version */          out_uint8(s, 2);        /* version */
72          out_uint16_le(s, length);          out_uint16_le(s, length);
73    
74          out_uint32_le(s, 1);          out_uint32_le(s, 1);
# Line 113  licence_send_request(uint8 * client_rand Line 108  licence_send_request(uint8 * client_rand
108          s = sec_init(sec_flags, length + 2);          s = sec_init(sec_flags, length + 2);
109    
110          out_uint8(s, LICENCE_TAG_REQUEST);          out_uint8(s, LICENCE_TAG_REQUEST);
111          out_uint8(s, 2); /* version */          out_uint8(s, 2);        /* version */
112          out_uint16_le(s, length);          out_uint16_le(s, length);
113    
114          out_uint32_le(s, 1);          out_uint32_le(s, 1);
# Line 163  licence_process_demand(STREAM s) Line 158  licence_process_demand(STREAM s)
158          {          {
159                  /* Generate a signature for the HWID buffer */                  /* Generate a signature for the HWID buffer */
160                  licence_generate_hwid(hwid);                  licence_generate_hwid(hwid);
161                  sec_sign(signature, 16, licence_sign_key, 16, hwid, sizeof(hwid));                  sec_sign(signature, 16, g_licence_sign_key, 16, hwid, sizeof(hwid));
162    
163                  /* Now encrypt the HWID */                  /* Now encrypt the HWID */
164                  RC4_set_key(&crypt_key, 16, licence_key);                  RC4_set_key(&crypt_key, 16, g_licence_key);
165                  RC4(&crypt_key, sizeof(hwid), hwid, hwid);                  RC4(&crypt_key, sizeof(hwid), hwid, hwid);
166    
167                  licence_present(null_data, null_data, licence_data, licence_size, hwid, signature);                  licence_present(null_data, null_data, licence_data, licence_size, hwid, signature);
# Line 174  licence_process_demand(STREAM s) Line 169  licence_process_demand(STREAM s)
169                  return;                  return;
170          }          }
171    
172          licence_send_request(null_data, null_data, username, hostname);          licence_send_request(null_data, null_data, g_username, g_hostname);
173  }  }
174    
175  /* Send an authentication response packet */  /* Send an authentication response packet */
# Line 188  licence_send_authresp(uint8 * token, uin Line 183  licence_send_authresp(uint8 * token, uin
183          s = sec_init(sec_flags, length + 2);          s = sec_init(sec_flags, length + 2);
184    
185          out_uint8(s, LICENCE_TAG_AUTHRESP);          out_uint8(s, LICENCE_TAG_AUTHRESP);
186          out_uint8(s, 2); /* version */          out_uint8(s, 2);        /* version */
187          out_uint16_le(s, length);          out_uint16_le(s, length);
188    
189          out_uint16_le(s, 1);          out_uint16_le(s, 1);
# Line 242  licence_process_authreq(STREAM s) Line 237  licence_process_authreq(STREAM s)
237          memcpy(out_token, in_token, LICENCE_TOKEN_SIZE);          memcpy(out_token, in_token, LICENCE_TOKEN_SIZE);
238    
239          /* Decrypt the token. It should read TEST in Unicode. */          /* Decrypt the token. It should read TEST in Unicode. */
240          RC4_set_key(&crypt_key, 16, licence_key);          RC4_set_key(&crypt_key, 16, g_licence_key);
241          RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);          RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);
242    
243          /* Generate a signature for a buffer of token and HWID */          /* Generate a signature for a buffer of token and HWID */
244          licence_generate_hwid(hwid);          licence_generate_hwid(hwid);
245          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);
246          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);
247          sec_sign(out_sig, 16, licence_sign_key, 16, sealed_buffer, sizeof(sealed_buffer));          sec_sign(out_sig, 16, g_licence_sign_key, 16, sealed_buffer, sizeof(sealed_buffer));
248    
249          /* Now encrypt the HWID */          /* Now encrypt the HWID */
250          RC4_set_key(&crypt_key, 16, licence_key);          RC4_set_key(&crypt_key, 16, g_licence_key);
251          RC4(&crypt_key, LICENCE_HWID_SIZE, hwid, crypt_hwid);          RC4(&crypt_key, LICENCE_HWID_SIZE, hwid, crypt_hwid);
252    
253          licence_send_authresp(out_token, crypt_hwid, out_sig);          licence_send_authresp(out_token, crypt_hwid, out_sig);
# Line 272  licence_process_issue(STREAM s) Line 267  licence_process_issue(STREAM s)
267          if (!s_check_rem(s, length))          if (!s_check_rem(s, length))
268                  return;                  return;
269    
270          RC4_set_key(&crypt_key, 16, licence_key);          RC4_set_key(&crypt_key, 16, g_licence_key);
271          RC4(&crypt_key, length, s->p, s->p);          RC4(&crypt_key, length, s->p, s->p);
272    
273          in_uint16(s, check);          in_uint16(s, check);
274          if (check != 0)          if (check != 0)
275                  return;                  return;
276    
277          licence_issued = True;          g_licence_issued = True;
278    
279          in_uint8s(s, 2);        /* pad */          in_uint8s(s, 2);        /* pad */
280    
# Line 293  licence_process_issue(STREAM s) Line 288  licence_process_issue(STREAM s)
288                          return;                          return;
289          }          }
290    
291          licence_issued = True;          g_licence_issued = True;
292          save_licence(s->p, length);          save_licence(s->p, length);
293  }  }
294    
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