/[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 25 by matty, Sat Jan 6 03:47:04 2001 UTC revision 82 by astrand, Tue Jul 30 07:18:48 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
8     the Free Software Foundation; either version 2 of the License, or     the Free Software Foundation; either version 2 of the License, or
9     (at your option) any later version.     (at your option) any later version.
10      
11     This program is distributed in the hope that it will be useful,     This program is distributed in the hope that it will be useful,
12     but WITHOUT ANY WARRANTY; without even the implied warranty of     but WITHOUT ANY WARRANTY; without even the implied warranty of
13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# 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  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 46  licence_generate_keys(uint8 *client_key, Line 48  licence_generate_keys(uint8 *client_key,
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((char *) (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, uint8 * hwid, uint8 * signature)
62    {
63            uint32 sec_flags = SEC_LICENCE_NEG;
64            uint16 length =
65                    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  static void
100  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)  
101  {  {
102          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
103          uint16 userlen = strlen(user) + 1;          uint16 userlen = strlen(user) + 1;
104          uint16 hostlen = strlen(host) + 1;          uint16 hostlen = strlen(host) + 1;
105          uint16 length = 120 + userlen + hostlen;          uint16 length = 128 + userlen + hostlen;
106          STREAM s;          STREAM s;
107    
108          s = sec_init(sec_flags, length + 2);          s = sec_init(sec_flags, length + 2);
# Line 63  licence_send_request(uint8 *client_rando Line 111  licence_send_request(uint8 *client_rando
111          out_uint16_le(s, length);          out_uint16_le(s, length);
112    
113          out_uint32_le(s, 1);          out_uint32_le(s, 1);
114          out_uint32_le(s, 0xff010000);          out_uint16(s, 0);
115            out_uint16_le(s, 0xff01);
116    
117          out_uint8p(s, client_random, SEC_RANDOM_SIZE);          out_uint8p(s, client_random, SEC_RANDOM_SIZE);
118          out_uint16(s, 0);          out_uint16(s, 0);
# Line 88  static void Line 137  static void
137  licence_process_demand(STREAM s)  licence_process_demand(STREAM s)
138  {  {
139          uint8 null_data[SEC_MODULUS_SIZE];          uint8 null_data[SEC_MODULUS_SIZE];
140            uint8 hwid[LICENCE_HWID_SIZE];
141            uint8 signature[LICENCE_SIGNATURE_SIZE];
142          uint8 *server_random;          uint8 *server_random;
143            uint8 *licence_data;
144            int licence_size;
145            RC4_KEY crypt_key;
146    
147          /* Retrieve the server random from the incoming packet */          /* Retrieve the server random from the incoming packet */
148          in_uint8p(s, server_random, SEC_RANDOM_SIZE);          in_uint8p(s, server_random, SEC_RANDOM_SIZE);
# Line 98  licence_process_demand(STREAM s) Line 152  licence_process_demand(STREAM s)
152          memset(null_data, 0, sizeof(null_data));          memset(null_data, 0, sizeof(null_data));
153          licence_generate_keys(null_data, server_random, null_data);          licence_generate_keys(null_data, server_random, null_data);
154    
155          /* Send a certificate request back to the server */          licence_size = load_licence(&licence_data);
156          licence_send_request(null_data, null_data, username, hostname);          if (licence_size == -1)
157            {
158                    licence_send_request(null_data, null_data, username, hostname);
159                    return;
160            }
161    
162            /* 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  }  }
173    
174  /* Send an authentication response packet */  /* Send an authentication response packet */
175  static void  static void
176  licence_send_authresp(uint8 *token, uint8 *crypt_hwid, uint8 *signature)  licence_send_authresp(uint8 * token, uint8 * crypt_hwid, uint8 * signature)
177  {  {
178          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
179          uint16 length = 58;          uint16 length = 58;
# Line 131  licence_send_authresp(uint8 *token, uint Line 200  licence_send_authresp(uint8 *token, uint
200    
201  /* Parse an authentication request packet */  /* Parse an authentication request packet */
202  static BOOL  static BOOL
203  licence_parse_authreq(STREAM s, uint8 **token, uint8 **signature)  licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature)
204  {  {
205          uint16 tokenlen;          uint16 tokenlen;
206    
# Line 140  licence_parse_authreq(STREAM s, uint8 ** Line 209  licence_parse_authreq(STREAM s, uint8 **
209          in_uint16_le(s, tokenlen);          in_uint16_le(s, tokenlen);
210          if (tokenlen != LICENCE_TOKEN_SIZE)          if (tokenlen != LICENCE_TOKEN_SIZE)
211          {          {
212                  ERROR("token len %d\n", tokenlen);                  error("token len %d\n", tokenlen);
213                  return False;                  return False;
214          }          }
215    
# Line 155  static void Line 224  static void
224  licence_process_authreq(STREAM s)  licence_process_authreq(STREAM s)
225  {  {
226          uint8 *in_token, *in_sig;          uint8 *in_token, *in_sig;
227          uint8 out_token[LICENCE_TOKEN_SIZE],          uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE];
                 decrypt_token[LICENCE_TOKEN_SIZE];  
228          uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];          uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];
229          uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];          uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];
230          uint8 out_sig[LICENCE_SIGNATURE_SIZE];          uint8 out_sig[LICENCE_SIGNATURE_SIZE];
# Line 170  licence_process_authreq(STREAM s) Line 238  licence_process_authreq(STREAM s)
238          RC4_set_key(&crypt_key, 16, licence_key);          RC4_set_key(&crypt_key, 16, licence_key);
239          RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);          RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);
240    
         /* Construct HWID */  
         buf_out_uint32(hwid, 2);  
         strncpy(hwid + 4, hostname, LICENCE_HWID_SIZE - 4);  
   
241          /* Generate a signature for a buffer of token and HWID */          /* Generate a signature for a buffer of token and HWID */
242            licence_generate_hwid(hwid);
243          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);
244          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);
245          sec_sign(out_sig, licence_sign_key, 16,          sec_sign(out_sig, 16, licence_sign_key, 16, sealed_buffer, sizeof(sealed_buffer));
                  sealed_buffer, sizeof(sealed_buffer));  
246    
247          /* Deliberately break signature if licencing disabled */          /* Deliberately break signature if licencing disabled */
248          if (!licence)          if (!licence)
# Line 211  licence_process_issue(STREAM s) Line 275  licence_process_issue(STREAM s)
275          if (check != 0)          if (check != 0)
276                  return;                  return;
277    
278          /* We should save the licence here */          licence_issued = True;
279          STATUS("Server issued licence.\n");          save_licence(s->p, length - 2);
280  }  }
281    
282  /* Process a licence packet */  /* Process a licence packet */
# Line 238  licence_process(STREAM s) Line 302  licence_process(STREAM s)
302                          licence_process_issue(s);                          licence_process_issue(s);
303                          break;                          break;
304    
305                    case LICENCE_TAG_REISSUE:
306                            break;
307    
308                  case LICENCE_TAG_RESULT:                  case LICENCE_TAG_RESULT:
309                          break;                          break;
310    
311                  default:                  default:
312                          NOTIMP("licence tag 0x%x\n", tag);                          unimpl("licence tag 0x%x\n", tag);
313          }          }
314  }  }
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