/[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 207 by matthewc, Thu Sep 26 14:26:46 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 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    #ifdef SAVE_LICENCE
59    /* Present an existing licence to the server */
60    static void
61    licence_present(uint8 * client_random, uint8 * rsa_data,
62                    uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature)
63    {
64            uint32 sec_flags = SEC_LICENCE_NEG;
65            uint16 length =
66                    16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE +
67                    licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE;
68            STREAM s;
69    
70            s = sec_init(sec_flags, length + 4);
71    
72            out_uint16_le(s, LICENCE_TAG_PRESENT);
73            out_uint16_le(s, length);
74    
75            out_uint32_le(s, 1);
76            out_uint16(s, 0);
77            out_uint16_le(s, 0x0201);
78    
79            out_uint8p(s, client_random, SEC_RANDOM_SIZE);
80            out_uint16(s, 0);
81            out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE));
82            out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);
83            out_uint8s(s, SEC_PADDING_SIZE);
84    
85            out_uint16_le(s, 1);
86            out_uint16_le(s, licence_size);
87            out_uint8p(s, licence_data, licence_size);
88    
89            out_uint16_le(s, 1);
90            out_uint16_le(s, LICENCE_HWID_SIZE);
91            out_uint8p(s, hwid, LICENCE_HWID_SIZE);
92    
93            out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE);
94    
95            s_mark_end(s);
96            sec_send(s, sec_flags);
97    }
98    #endif
99    
100  /* Send a licence request packet */  /* Send a licence request packet */
101  static void  static void
102  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)  
103  {  {
104          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
105          uint16 userlen = strlen(user) + 1;          uint16 userlen = strlen(user) + 1;
106          uint16 hostlen = strlen(host) + 1;          uint16 hostlen = strlen(host) + 1;
107          uint16 length = 120 + userlen + hostlen;          uint16 length = 128 + userlen + hostlen;
108          STREAM s;          STREAM s;
109    
110          s = sec_init(sec_flags, length + 2);          s = sec_init(sec_flags, length + 2);
# Line 63  licence_send_request(uint8 *client_rando Line 113  licence_send_request(uint8 *client_rando
113          out_uint16_le(s, length);          out_uint16_le(s, length);
114    
115          out_uint32_le(s, 1);          out_uint32_le(s, 1);
116          out_uint32_le(s, 0xff010000);          out_uint16(s, 0);
117            out_uint16_le(s, 0xff01);
118    
119          out_uint8p(s, client_random, SEC_RANDOM_SIZE);          out_uint8p(s, client_random, SEC_RANDOM_SIZE);
120          out_uint16(s, 0);          out_uint16(s, 0);
# Line 89  licence_process_demand(STREAM s) Line 140  licence_process_demand(STREAM s)
140  {  {
141          uint8 null_data[SEC_MODULUS_SIZE];          uint8 null_data[SEC_MODULUS_SIZE];
142          uint8 *server_random;          uint8 *server_random;
143    #ifdef SAVE_LICENCE
144            uint8 signature[LICENCE_SIGNATURE_SIZE];
145            uint8 hwid[LICENCE_HWID_SIZE];
146            uint8 *licence_data;
147            int licence_size;
148            RC4_KEY crypt_key;
149    #endif
150    
151          /* Retrieve the server random from the incoming packet */          /* Retrieve the server random from the incoming packet */
152          in_uint8p(s, server_random, SEC_RANDOM_SIZE);          in_uint8p(s, server_random, SEC_RANDOM_SIZE);
# Line 98  licence_process_demand(STREAM s) Line 156  licence_process_demand(STREAM s)
156          memset(null_data, 0, sizeof(null_data));          memset(null_data, 0, sizeof(null_data));
157          licence_generate_keys(null_data, server_random, null_data);          licence_generate_keys(null_data, server_random, null_data);
158    
159          /* Send a certificate request back to the server */  #ifdef SAVE_LICENCE
160            licence_size = load_licence(&licence_data);
161            if (licence_size != -1)
162            {
163                    /* Generate a signature for the HWID buffer */
164                    licence_generate_hwid(hwid);
165                    sec_sign(signature, 16, 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, hwid, signature);
172                    xfree(licence_data);
173                    return;
174            }
175    #endif
176    
177          licence_send_request(null_data, null_data, username, hostname);          licence_send_request(null_data, null_data, username, hostname);
178  }  }
179    
180  /* Send an authentication response packet */  /* Send an authentication response packet */
181  static void  static void
182  licence_send_authresp(uint8 *token, uint8 *crypt_hwid, uint8 *signature)  licence_send_authresp(uint8 * token, uint8 * crypt_hwid, uint8 * signature)
183  {  {
184          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
185          uint16 length = 58;          uint16 length = 58;
# Line 131  licence_send_authresp(uint8 *token, uint Line 206  licence_send_authresp(uint8 *token, uint
206    
207  /* Parse an authentication request packet */  /* Parse an authentication request packet */
208  static BOOL  static BOOL
209  licence_parse_authreq(STREAM s, uint8 **token, uint8 **signature)  licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature)
210  {  {
211          uint16 tokenlen;          uint16 tokenlen;
212    
# Line 140  licence_parse_authreq(STREAM s, uint8 ** Line 215  licence_parse_authreq(STREAM s, uint8 **
215          in_uint16_le(s, tokenlen);          in_uint16_le(s, tokenlen);
216          if (tokenlen != LICENCE_TOKEN_SIZE)          if (tokenlen != LICENCE_TOKEN_SIZE)
217          {          {
218                  ERROR("token len %d\n", tokenlen);                  error("token len %d\n", tokenlen);
219                  return False;                  return False;
220          }          }
221    
# Line 155  static void Line 230  static void
230  licence_process_authreq(STREAM s)  licence_process_authreq(STREAM s)
231  {  {
232          uint8 *in_token, *in_sig;          uint8 *in_token, *in_sig;
233          uint8 out_token[LICENCE_TOKEN_SIZE],          uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE];
                 decrypt_token[LICENCE_TOKEN_SIZE];  
234          uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];          uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];
235          uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];          uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];
236          uint8 out_sig[LICENCE_SIGNATURE_SIZE];          uint8 out_sig[LICENCE_SIGNATURE_SIZE];
# Line 170  licence_process_authreq(STREAM s) Line 244  licence_process_authreq(STREAM s)
244          RC4_set_key(&crypt_key, 16, licence_key);          RC4_set_key(&crypt_key, 16, licence_key);
245          RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);          RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);
246    
         /* Construct HWID */  
         buf_out_uint32(hwid, 2);  
         strncpy(hwid + 4, hostname, LICENCE_HWID_SIZE - 4);  
   
247          /* Generate a signature for a buffer of token and HWID */          /* Generate a signature for a buffer of token and HWID */
248            licence_generate_hwid(hwid);
249          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);
250          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);
251          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));  
252    
253          /* Deliberately break signature if licencing disabled */          /* Deliberately break signature if licencing disabled */
254          if (!licence)          if (!licence)
# Line 211  licence_process_issue(STREAM s) Line 281  licence_process_issue(STREAM s)
281          if (check != 0)          if (check != 0)
282                  return;                  return;
283    
284          /* We should save the licence here */          licence_issued = True;
285          STATUS("Server issued licence.\n");  
286    #ifdef SAVE_LICENCE
287            save_licence(s->p, length - 2);
288    #endif
289  }  }
290    
291  /* Process a licence packet */  /* Process a licence packet */
# Line 238  licence_process(STREAM s) Line 311  licence_process(STREAM s)
311                          licence_process_issue(s);                          licence_process_issue(s);
312                          break;                          break;
313    
314                    case LICENCE_TAG_REISSUE:
315                            break;
316    
317                  case LICENCE_TAG_RESULT:                  case LICENCE_TAG_RESULT:
318                          break;                          break;
319    
320                  default:                  default:
321                          NOTIMP("licence tag 0x%x\n", tag);                          unimpl("licence tag 0x%x\n", tag);
322          }          }
323  }  }
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