/[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 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 1999-2000     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
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 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];
29    
30    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  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 46  licence_generate_keys(uint8 *client_key, Line 47  licence_generate_keys(uint8 *client_key,
47          sec_hash_16(licence_key, &session_key[16], client_key, server_key);          sec_hash_16(licence_key, &session_key[16], client_key, server_key);
48  }  }
49    
50    static void
51    licence_generate_hwid(uint8 * hwid)
52    {
53            buf_out_uint32(hwid, 2);
54            strncpy((char *) (hwid + 4), hostname, LICENCE_HWID_SIZE - 4);
55    }
56    
57    #ifdef SAVE_LICENCE
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    #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;
105          uint16 hostlen = strlen(host) + 1;          uint16 hostlen = strlen(host) + 1;
106          uint16 length = 120 + userlen + hostlen;          uint16 length = 128 + userlen + hostlen;
107          STREAM s;          STREAM s;
108    
109          s = sec_init(sec_flags, length + 2);          s = sec_init(sec_flags, length + 2);
# Line 63  licence_send_request(uint8 *client_rando Line 112  licence_send_request(uint8 *client_rando
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 89  licence_process_demand(STREAM s) Line 139  licence_process_demand(STREAM s)
139  {  {
140          uint8 null_data[SEC_MODULUS_SIZE];          uint8 null_data[SEC_MODULUS_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;
146            int licence_size;
147            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 98  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          /* Send a certificate request back to the server */  #ifdef SAVE_LICENCE
159            licence_size = load_licence(&licence_data);
160            if (licence_size != -1)
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                    return;
173            }
174    #endif
175    
176          licence_send_request(null_data, null_data, username, hostname);          licence_send_request(null_data, null_data, username, hostname);
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 131  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 140  licence_parse_authreq(STREAM s, uint8 ** Line 214  licence_parse_authreq(STREAM s, uint8 **
214          in_uint16_le(s, tokenlen);          in_uint16_le(s, tokenlen);
215          if (tokenlen != LICENCE_TOKEN_SIZE)          if (tokenlen != LICENCE_TOKEN_SIZE)
216          {          {
217                  ERROR("token len %d\n", tokenlen);                  error("token len %d\n", tokenlen);
218                  return False;                  return False;
219          }          }
220    
# Line 155  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 170  licence_process_authreq(STREAM s) Line 243  licence_process_authreq(STREAM s)
243          RC4_set_key(&crypt_key, 16, licence_key);          RC4_set_key(&crypt_key, 16, licence_key);
244          RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);          RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);
245    
         /* Construct HWID */  
         buf_out_uint32(hwid, 2);  
         strncpy(hwid + 4, hostname, LICENCE_HWID_SIZE - 4);  
   
246          /* Generate a signature for a buffer of token and HWID */          /* Generate a signature for a buffer of token and HWID */
247            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, 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 211  licence_process_issue(STREAM s) Line 276  licence_process_issue(STREAM s)
276          if (check != 0)          if (check != 0)
277                  return;                  return;
278    
279          /* We should save the licence here */          licence_issued = True;
280          STATUS("Server issued licence.\n");  
281    #ifdef SAVE_LICENCE
282            save_licence(s->p, length - 2);
283    #endif
284  }  }
285    
286  /* Process a licence packet */  /* Process a licence packet */
# Line 238  licence_process(STREAM s) Line 306  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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