/[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 359 by forsberg, Thu Apr 3 13:52:41 2003 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 19  Line 19 
19  */  */
20    
21  #include "rdesktop.h"  #include "rdesktop.h"
22    
23    #ifdef WITH_OPENSSL
24    #include <openssl/rc4.h>
25    #else
26  #include "crypto/rc4.h"  #include "crypto/rc4.h"
27    #endif
28    
29  extern char username[16];  extern char username[16];
30  extern char hostname[16];  extern char hostname[16];
 extern BOOL licence;  
31    
32  static uint8 licence_key[16];  static uint8 licence_key[16];
33  static uint8 licence_sign_key[16];  static uint8 licence_sign_key[16];
34    
35    BOOL licence_issued = False;
36    
37  /* Generate a session key and RC4 keys, given client and server randoms */  /* Generate a session key and RC4 keys, given client and server randoms */
38  void  static void
39  licence_generate_keys(uint8 *client_key, uint8 *server_key, uint8 *client_rsa)  licence_generate_keys(uint8 * client_key, uint8 * server_key, uint8 * client_rsa)
40  {  {
41          uint8 session_key[48];          uint8 session_key[48];
42          uint8 temp_hash[48];          uint8 temp_hash[48];
# Line 46  licence_generate_keys(uint8 *client_key, Line 52  licence_generate_keys(uint8 *client_key,
52          sec_hash_16(licence_key, &session_key[16], client_key, server_key);          sec_hash_16(licence_key, &session_key[16], client_key, server_key);
53  }  }
54    
55    static void
56    licence_generate_hwid(uint8 * hwid)
57    {
58            buf_out_uint32(hwid, 2);
59            strncpy((char *) (hwid + 4), hostname, LICENCE_HWID_SIZE - 4);
60    }
61    
62    /* Present an existing licence to the server */
63    static void
64    licence_present(uint8 * client_random, uint8 * rsa_data,
65                    uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature)
66    {
67            uint32 sec_flags = SEC_LICENCE_NEG;
68            uint16 length =
69                    16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE +
70                    licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE;
71            STREAM s;
72    
73            s = sec_init(sec_flags, length + 4);
74    
75            out_uint16_le(s, LICENCE_TAG_PRESENT);
76            out_uint16_le(s, length);
77    
78            out_uint32_le(s, 1);
79            out_uint16(s, 0);
80            out_uint16_le(s, 0x0201);
81    
82            out_uint8p(s, client_random, SEC_RANDOM_SIZE);
83            out_uint16(s, 0);
84            out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE));
85            out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);
86            out_uint8s(s, SEC_PADDING_SIZE);
87    
88            out_uint16_le(s, 1);
89            out_uint16_le(s, licence_size);
90            out_uint8p(s, licence_data, licence_size);
91    
92            out_uint16_le(s, 1);
93            out_uint16_le(s, LICENCE_HWID_SIZE);
94            out_uint8p(s, hwid, LICENCE_HWID_SIZE);
95    
96            out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE);
97    
98            s_mark_end(s);
99            sec_send(s, sec_flags);
100    }
101    
102  /* Send a licence request packet */  /* Send a licence request packet */
103  static void  static void
104  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)  
105  {  {
106          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
107          uint16 userlen = strlen(user) + 1;          uint16 userlen = strlen(user) + 1;
108          uint16 hostlen = strlen(host) + 1;          uint16 hostlen = strlen(host) + 1;
109          uint16 length = 120 + userlen + hostlen;          uint16 length = 128 + userlen + hostlen;
110          STREAM s;          STREAM s;
111    
112          s = sec_init(sec_flags, length + 2);          s = sec_init(sec_flags, length + 2);
# Line 63  licence_send_request(uint8 *client_rando Line 115  licence_send_request(uint8 *client_rando
115          out_uint16_le(s, length);          out_uint16_le(s, length);
116    
117          out_uint32_le(s, 1);          out_uint32_le(s, 1);
118          out_uint32_le(s, 0xff010000);          out_uint16(s, 0);
119            out_uint16_le(s, 0xff01);
120    
121          out_uint8p(s, client_random, SEC_RANDOM_SIZE);          out_uint8p(s, client_random, SEC_RANDOM_SIZE);
122          out_uint16(s, 0);          out_uint16(s, 0);
# Line 89  licence_process_demand(STREAM s) Line 142  licence_process_demand(STREAM s)
142  {  {
143          uint8 null_data[SEC_MODULUS_SIZE];          uint8 null_data[SEC_MODULUS_SIZE];
144          uint8 *server_random;          uint8 *server_random;
145            uint8 signature[LICENCE_SIGNATURE_SIZE];
146            uint8 hwid[LICENCE_HWID_SIZE];
147            uint8 *licence_data;
148            int licence_size;
149            RC4_KEY crypt_key;
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 */          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    
175          licence_send_request(null_data, null_data, username, hostname);          licence_send_request(null_data, null_data, username, hostname);
176  }  }
177    
178  /* Send an authentication response packet */  /* Send an authentication response packet */
179  static void  static void
180  licence_send_authresp(uint8 *token, uint8 *crypt_hwid, uint8 *signature)  licence_send_authresp(uint8 * token, uint8 * crypt_hwid, uint8 * signature)
181  {  {
182          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
183          uint16 length = 58;          uint16 length = 58;
# Line 131  licence_send_authresp(uint8 *token, uint Line 204  licence_send_authresp(uint8 *token, uint
204    
205  /* Parse an authentication request packet */  /* Parse an authentication request packet */
206  static BOOL  static BOOL
207  licence_parse_authreq(STREAM s, uint8 **token, uint8 **signature)  licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature)
208  {  {
209          uint16 tokenlen;          uint16 tokenlen;
210    
# Line 140  licence_parse_authreq(STREAM s, uint8 ** Line 213  licence_parse_authreq(STREAM s, uint8 **
213          in_uint16_le(s, tokenlen);          in_uint16_le(s, tokenlen);
214          if (tokenlen != LICENCE_TOKEN_SIZE)          if (tokenlen != LICENCE_TOKEN_SIZE)
215          {          {
216                  ERROR("token len %d\n", tokenlen);                  error("token len %d\n", tokenlen);
217                  return False;                  return False;
218          }          }
219    
# Line 155  static void Line 228  static void
228  licence_process_authreq(STREAM s)  licence_process_authreq(STREAM s)
229  {  {
230          uint8 *in_token, *in_sig;          uint8 *in_token, *in_sig;
231          uint8 out_token[LICENCE_TOKEN_SIZE],          uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE];
                 decrypt_token[LICENCE_TOKEN_SIZE];  
232          uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];          uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];
233          uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];          uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];
234          uint8 out_sig[LICENCE_SIGNATURE_SIZE];          uint8 out_sig[LICENCE_SIGNATURE_SIZE];
# Line 170  licence_process_authreq(STREAM s) Line 242  licence_process_authreq(STREAM s)
242          RC4_set_key(&crypt_key, 16, licence_key);          RC4_set_key(&crypt_key, 16, licence_key);
243          RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);          RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);
244    
         /* Construct HWID */  
         buf_out_uint32(hwid, 2);  
         strncpy(hwid + 4, hostname, LICENCE_HWID_SIZE - 4);  
   
245          /* Generate a signature for a buffer of token and HWID */          /* Generate a signature for a buffer of token and HWID */
246            licence_generate_hwid(hwid);
247          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);
248          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);
249          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));  
250    
251          /* Now encrypt the HWID */          /* Now encrypt the HWID */
252          RC4_set_key(&crypt_key, 16, licence_key);          RC4_set_key(&crypt_key, 16, licence_key);
# 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 227  licence_process(STREAM s) Line 291  licence_process(STREAM s)
291          switch (tag)          switch (tag)
292          {          {
293                  case LICENCE_TAG_DEMAND:                  case LICENCE_TAG_DEMAND:
294                    case LICENCE_TAG_DEMAND_5:
295                          licence_process_demand(s);                          licence_process_demand(s);
296                          break;                          break;
297    
298                  case LICENCE_TAG_AUTHREQ:                  case LICENCE_TAG_AUTHREQ:
299                    case LICENCE_TAG_AUTHREQ_5:
300                          licence_process_authreq(s);                          licence_process_authreq(s);
301                          break;                          break;
302    
303                  case LICENCE_TAG_ISSUE:                  case LICENCE_TAG_ISSUE:
304                    case LICENCE_TAG_ISSUE_5:
305                          licence_process_issue(s);                          licence_process_issue(s);
306                          break;                          break;
307    
308                    case LICENCE_TAG_REISSUE:
309                    case LICENCE_TAG_REISSUE_5:
310                            break;
311    
312                  case LICENCE_TAG_RESULT:                  case LICENCE_TAG_RESULT:
313                    case LICENCE_TAG_RESULT_5:
314                          break;                          break;
315    
316                  default:                  default:
317                          NOTIMP("licence tag 0x%x\n", tag);                          unimpl("licence tag 0x%x\n", tag);
318          }          }
319  }  }
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