/[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 24 by matty, Sat Jan 6 03:12:10 2001 UTC revision 39 by matthewc, Fri Apr 5 07:57:43 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 1999-2000     Copyright (C) Matthew Chapman 1999-2001
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 28  extern BOOL licence; Line 28  extern BOOL licence;
28  static uint8 licence_key[16];  static uint8 licence_key[16];
29  static uint8 licence_sign_key[16];  static uint8 licence_sign_key[16];
30    
31    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  void licence_generate_keys(uint8 *client_key, uint8 *server_key,  static void
35                             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 46  void licence_generate_keys(uint8 *client Line 48  void licence_generate_keys(uint8 *client
48          sec_hash_16(licence_key, &session_key[16], client_key, server_key);          sec_hash_16(licence_key, &session_key[16], client_key, server_key);
49  }  }
50    
51    static void
52    licence_generate_hwid(uint8 *hwid)
53    {
54            buf_out_uint32(hwid, 2);
55            strncpy(hwid + 4, hostname, LICENCE_HWID_SIZE - 4);
56    }
57    
58    /* Present an existing licence to the server */
59    static void
60    licence_present(uint8 *client_random, uint8 *rsa_data,
61                    uint8 *licence_data, int licence_size,
62                    uint8 *hwid, uint8 *signature)
63    {
64            uint32 sec_flags = SEC_LICENCE_NEG;
65            uint16 length = 16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE
66                            + licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE;
67            STREAM s;
68    
69            s = sec_init(sec_flags, length + 4);
70    
71            out_uint16_le(s, LICENCE_TAG_PRESENT);
72            out_uint16_le(s, length);
73    
74            out_uint32_le(s, 1);
75            out_uint16(s, 0);
76            out_uint16_le(s, 0x0201);
77    
78            out_uint8p(s, client_random, SEC_RANDOM_SIZE);
79            out_uint16(s, 0);
80            out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE));
81            out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);
82            out_uint8s(s, SEC_PADDING_SIZE);
83    
84            out_uint16_le(s, 1);
85            out_uint16_le(s, licence_size);
86            out_uint8p(s, licence_data, licence_size);
87    
88            out_uint16_le(s, 1);
89            out_uint16_le(s, LICENCE_HWID_SIZE);
90            out_uint8p(s, hwid, LICENCE_HWID_SIZE);
91    
92            out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE);
93    
94            s_mark_end(s);
95            sec_send(s, sec_flags);
96    }
97    
98  /* Send a licence request packet */  /* Send a licence request packet */
99  static void licence_send_request(uint8 *client_random, uint8 *rsa_data,  static void
100                                   char *user, char *host)  licence_send_request(uint8 *client_random, uint8 *rsa_data,
101                         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 62  static void licence_send_request(uint8 * Line 112  static void licence_send_request(uint8 *
112          out_uint16_le(s, length);          out_uint16_le(s, length);
113    
114          out_uint32_le(s, 1);          out_uint32_le(s, 1);
115          out_uint32_le(s, 0xff010000);          out_uint16(s, 0);
116            out_uint16_le(s, 0xff01);
117    
118          out_uint8p(s, client_random, SEC_RANDOM_SIZE);          out_uint8p(s, client_random, SEC_RANDOM_SIZE);
119          out_uint16(s, 0);          out_uint16(s, 0);
# Line 83  static void licence_send_request(uint8 * Line 134  static void licence_send_request(uint8 *
134  }  }
135    
136  /* Process a licence demand packet */  /* Process a licence demand packet */
137  static void licence_process_demand(STREAM s)  static void
138    licence_process_demand(STREAM s)
139  {  {
140          uint8 null_data[SEC_MODULUS_SIZE];          uint8 null_data[SEC_MODULUS_SIZE];
141            uint8 hwid[LICENCE_HWID_SIZE];
142            uint8 signature[LICENCE_SIGNATURE_SIZE];
143          uint8 *server_random;          uint8 *server_random;
144            uint8 *licence_data;
145            int licence_size;
146            RC4_KEY crypt_key;
147    
148          /* Retrieve the server random from the incoming packet */          /* Retrieve the server random from the incoming packet */
149          in_uint8p(s, server_random, SEC_RANDOM_SIZE);          in_uint8p(s, server_random, SEC_RANDOM_SIZE);
# Line 96  static void licence_process_demand(STREA Line 153  static void licence_process_demand(STREA
153          memset(null_data, 0, sizeof(null_data));          memset(null_data, 0, sizeof(null_data));
154          licence_generate_keys(null_data, server_random, null_data);          licence_generate_keys(null_data, server_random, null_data);
155    
156          /* Send a certificate request back to the server */          licence_size = load_licence(&licence_data);
157          licence_send_request(null_data, null_data, username, hostname);          if (licence_size == -1)
158            {
159                    licence_send_request(null_data, null_data, username, hostname);
160                    return;
161            }
162    
163            /* Generate a signature for the HWID buffer */
164            licence_generate_hwid(hwid);
165            sec_sign(signature, 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,
172                                            hwid, signature);
173            xfree(licence_data);
174  }  }
175    
176  /* Send an authentication response packet */  /* Send an authentication response packet */
177  static void licence_send_authresp(uint8 *token, uint8 *crypt_hwid,  static void
178                                    uint8 *signature)  licence_send_authresp(uint8 *token, uint8 *crypt_hwid, uint8 *signature)
179  {  {
180          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
181          uint16 length = 58;          uint16 length = 58;
# Line 128  static void licence_send_authresp(uint8 Line 201  static void licence_send_authresp(uint8
201  }  }
202    
203  /* Parse an authentication request packet */  /* Parse an authentication request packet */
204  static BOOL licence_parse_authreq(STREAM s, uint8 **token, uint8 **signature)  static BOOL
205    licence_parse_authreq(STREAM s, uint8 **token, uint8 **signature)
206  {  {
207          uint16 tokenlen;          uint16 tokenlen;
208    
# Line 137  static BOOL licence_parse_authreq(STREAM Line 211  static BOOL licence_parse_authreq(STREAM
211          in_uint16_le(s, tokenlen);          in_uint16_le(s, tokenlen);
212          if (tokenlen != LICENCE_TOKEN_SIZE)          if (tokenlen != LICENCE_TOKEN_SIZE)
213          {          {
214                  ERROR("token len %d\n", tokenlen);                  error("token len %d\n", tokenlen);
215                  return False;                  return False;
216          }          }
217    
# Line 148  static BOOL licence_parse_authreq(STREAM Line 222  static BOOL licence_parse_authreq(STREAM
222  }  }
223    
224  /* Process an authentication request packet */  /* Process an authentication request packet */
225  static void licence_process_authreq(STREAM s)  static void
226    licence_process_authreq(STREAM s)
227  {  {
228          uint8 *in_token, *in_sig;          uint8 *in_token, *in_sig;
229          uint8 out_token[LICENCE_TOKEN_SIZE],          uint8 out_token[LICENCE_TOKEN_SIZE],
# Line 166  static void licence_process_authreq(STRE Line 241  static void licence_process_authreq(STRE
241          RC4_set_key(&crypt_key, 16, licence_key);          RC4_set_key(&crypt_key, 16, licence_key);
242          RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);          RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);
243    
         /* Construct HWID */  
         buf_out_uint32(hwid, 2);  
         strncpy(hwid + 4, hostname, LICENCE_HWID_SIZE - 4);  
   
244          /* Generate a signature for a buffer of token and HWID */          /* Generate a signature for a buffer of token and HWID */
245            licence_generate_hwid(hwid);
246          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);
247          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);
248          sec_sign(out_sig, licence_sign_key, 16,          sec_sign(out_sig, licence_sign_key, 16,
# Line 188  static void licence_process_authreq(STRE Line 260  static void licence_process_authreq(STRE
260  }  }
261    
262  /* Process an licence issue packet */  /* Process an licence issue packet */
263  static void licence_process_issue(STREAM s)  static void
264    licence_process_issue(STREAM s)
265  {  {
266          RC4_KEY crypt_key;          RC4_KEY crypt_key;
267          uint32 length;          uint32 length;
# Line 206  static void licence_process_issue(STREAM Line 279  static void licence_process_issue(STREAM
279          if (check != 0)          if (check != 0)
280                  return;                  return;
281    
282          /* We should save the licence here */          licence_issued = True;
283          STATUS("Server issued licence.\n");          save_licence(s->p, length-2);
284  }  }
285    
286  /* Process a licence packet */  /* Process a licence packet */
287  void licence_process(STREAM s)  void
288    licence_process(STREAM s)
289  {  {
290          uint16 tag;          uint16 tag;
291    
# Line 232  void licence_process(STREAM s) Line 306  void licence_process(STREAM s)
306                          licence_process_issue(s);                          licence_process_issue(s);
307                          break;                          break;
308    
309                    case LICENCE_TAG_REISSUE:
310                            break;
311    
312                  case LICENCE_TAG_RESULT:                  case LICENCE_TAG_RESULT:
313                          break;                          break;
314    
315                  default:                  default:
316                          NOTIMP("licence tag 0x%x\n", tag);                          unimpl("licence tag 0x%x\n", tag);
317          }          }
318  }  }
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