/[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 28 by matty, Wed Jun 20 13:54:48 2001 UTC revision 366 by matthewc, Wed Apr 16 12:52:46 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];
# Line 31  static uint8 licence_sign_key[16]; Line 35  static uint8 licence_sign_key[16];
35  BOOL licence_issued = False;  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 48  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_uint8(s, LICENCE_TAG_PRESENT);
76            out_uint8(s, 2); /* version */
77            out_uint16_le(s, length);
78    
79            out_uint32_le(s, 1);
80            out_uint16(s, 0);
81            out_uint16_le(s, 0x0201);
82    
83            out_uint8p(s, client_random, SEC_RANDOM_SIZE);
84            out_uint16(s, 0);
85            out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE));
86            out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);
87            out_uint8s(s, SEC_PADDING_SIZE);
88    
89            out_uint16_le(s, 1);
90            out_uint16_le(s, licence_size);
91            out_uint8p(s, licence_data, licence_size);
92    
93            out_uint16_le(s, 1);
94            out_uint16_le(s, LICENCE_HWID_SIZE);
95            out_uint8p(s, hwid, LICENCE_HWID_SIZE);
96    
97            out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE);
98    
99            s_mark_end(s);
100            sec_send(s, sec_flags);
101    }
102    
103  /* Send a licence request packet */  /* Send a licence request packet */
104  static void  static void
105  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)  
106  {  {
107          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
108          uint16 userlen = strlen(user) + 1;          uint16 userlen = strlen(user) + 1;
109          uint16 hostlen = strlen(host) + 1;          uint16 hostlen = strlen(host) + 1;
110          uint16 length = 120 + userlen + hostlen;          uint16 length = 128 + userlen + hostlen;
111          STREAM s;          STREAM s;
112    
113          s = sec_init(sec_flags, length + 2);          s = sec_init(sec_flags, length + 2);
114    
115          out_uint16_le(s, LICENCE_TAG_REQUEST);          out_uint8(s, LICENCE_TAG_REQUEST);
116            out_uint8(s, 2); /* version */
117          out_uint16_le(s, length);          out_uint16_le(s, length);
118    
119          out_uint32_le(s, 1);          out_uint32_le(s, 1);
120          out_uint32_le(s, 0xff010000);          out_uint16(s, 0);
121            out_uint16_le(s, 0xff01);
122    
123          out_uint8p(s, client_random, SEC_RANDOM_SIZE);          out_uint8p(s, client_random, SEC_RANDOM_SIZE);
124          out_uint16(s, 0);          out_uint16(s, 0);
# Line 73  licence_send_request(uint8 *client_rando Line 126  licence_send_request(uint8 *client_rando
126          out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);          out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);
127          out_uint8s(s, SEC_PADDING_SIZE);          out_uint8s(s, SEC_PADDING_SIZE);
128    
129          out_uint16(s, LICENCE_TAG_USER);          out_uint16_le(s, LICENCE_TAG_USER);
130          out_uint16(s, userlen);          out_uint16_le(s, userlen);
131          out_uint8p(s, user, userlen);          out_uint8p(s, user, userlen);
132    
133          out_uint16(s, LICENCE_TAG_HOST);          out_uint16_le(s, LICENCE_TAG_HOST);
134          out_uint16(s, hostlen);          out_uint16_le(s, hostlen);
135          out_uint8p(s, host, hostlen);          out_uint8p(s, host, hostlen);
136    
137          s_mark_end(s);          s_mark_end(s);
# Line 91  licence_process_demand(STREAM s) Line 144  licence_process_demand(STREAM s)
144  {  {
145          uint8 null_data[SEC_MODULUS_SIZE];          uint8 null_data[SEC_MODULUS_SIZE];
146          uint8 *server_random;          uint8 *server_random;
147            uint8 signature[LICENCE_SIGNATURE_SIZE];
148            uint8 hwid[LICENCE_HWID_SIZE];
149            uint8 *licence_data;
150            int licence_size;
151            RC4_KEY crypt_key;
152    
153          /* Retrieve the server random from the incoming packet */          /* Retrieve the server random from the incoming packet */
154          in_uint8p(s, server_random, SEC_RANDOM_SIZE);          in_uint8p(s, server_random, SEC_RANDOM_SIZE);
# Line 100  licence_process_demand(STREAM s) Line 158  licence_process_demand(STREAM s)
158          memset(null_data, 0, sizeof(null_data));          memset(null_data, 0, sizeof(null_data));
159          licence_generate_keys(null_data, server_random, null_data);          licence_generate_keys(null_data, server_random, null_data);
160    
161          /* Send a certificate request back to the server */          licence_size = load_licence(&licence_data);
162            if (licence_size != -1)
163            {
164                    /* Generate a signature for the HWID buffer */
165                    licence_generate_hwid(hwid);
166                    sec_sign(signature, 16, licence_sign_key, 16, hwid, sizeof(hwid));
167    
168                    /* Now encrypt the HWID */
169                    RC4_set_key(&crypt_key, 16, licence_key);
170                    RC4(&crypt_key, sizeof(hwid), hwid, hwid);
171    
172                    licence_present(null_data, null_data, licence_data, licence_size, hwid, signature);
173                    xfree(licence_data);
174                    return;
175            }
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 114  licence_send_authresp(uint8 *token, uint Line 187  licence_send_authresp(uint8 *token, uint
187    
188          s = sec_init(sec_flags, length + 2);          s = sec_init(sec_flags, length + 2);
189    
190          out_uint16_le(s, LICENCE_TAG_AUTHRESP);          out_uint8(s, LICENCE_TAG_AUTHRESP);
191            out_uint8(s, 2); /* version */
192          out_uint16_le(s, length);          out_uint16_le(s, length);
193    
194          out_uint16_le(s, 1);          out_uint16_le(s, 1);
# Line 133  licence_send_authresp(uint8 *token, uint Line 207  licence_send_authresp(uint8 *token, uint
207    
208  /* Parse an authentication request packet */  /* Parse an authentication request packet */
209  static BOOL  static BOOL
210  licence_parse_authreq(STREAM s, uint8 **token, uint8 **signature)  licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature)
211  {  {
212          uint16 tokenlen;          uint16 tokenlen;
213    
# Line 142  licence_parse_authreq(STREAM s, uint8 ** Line 216  licence_parse_authreq(STREAM s, uint8 **
216          in_uint16_le(s, tokenlen);          in_uint16_le(s, tokenlen);
217          if (tokenlen != LICENCE_TOKEN_SIZE)          if (tokenlen != LICENCE_TOKEN_SIZE)
218          {          {
219                  ERROR("token len %d\n", tokenlen);                  error("token len %d\n", tokenlen);
220                  return False;                  return False;
221          }          }
222    
# Line 157  static void Line 231  static void
231  licence_process_authreq(STREAM s)  licence_process_authreq(STREAM s)
232  {  {
233          uint8 *in_token, *in_sig;          uint8 *in_token, *in_sig;
234          uint8 out_token[LICENCE_TOKEN_SIZE],          uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE];
                 decrypt_token[LICENCE_TOKEN_SIZE];  
235          uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];          uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];
236          uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];          uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];
237          uint8 out_sig[LICENCE_SIGNATURE_SIZE];          uint8 out_sig[LICENCE_SIGNATURE_SIZE];
# Line 172  licence_process_authreq(STREAM s) Line 245  licence_process_authreq(STREAM s)
245          RC4_set_key(&crypt_key, 16, licence_key);          RC4_set_key(&crypt_key, 16, licence_key);
246          RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);          RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);
247    
         /* Construct HWID */  
         buf_out_uint32(hwid, 2);  
         strncpy(hwid + 4, hostname, LICENCE_HWID_SIZE - 4);  
   
248          /* Generate a signature for a buffer of token and HWID */          /* Generate a signature for a buffer of token and HWID */
249            licence_generate_hwid(hwid);
250          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);
251          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);
252          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));  
253    
254          /* Now encrypt the HWID */          /* Now encrypt the HWID */
255          RC4_set_key(&crypt_key, 16, licence_key);          RC4_set_key(&crypt_key, 16, licence_key);
# Line 214  licence_process_issue(STREAM s) Line 279  licence_process_issue(STREAM s)
279                  return;                  return;
280    
281          licence_issued = True;          licence_issued = True;
282            save_licence(s->p, length - 2);
         /* We should save the licence here */  
         STATUS("Server issued licence.\n");  
283  }  }
284    
285  /* Process a licence packet */  /* Process a licence packet */
286  void  void
287  licence_process(STREAM s)  licence_process(STREAM s)
288  {  {
289          uint16 tag;          uint8 tag;
290    
291          in_uint16_le(s, tag);          in_uint8(s, tag);
292          in_uint8s(s, 2);        /* length */          in_uint8s(s, 3);        /* version, length */
293    
294          switch (tag)          switch (tag)
295          {          {
# Line 242  licence_process(STREAM s) Line 305  licence_process(STREAM s)
305                          licence_process_issue(s);                          licence_process_issue(s);
306                          break;                          break;
307    
308                    case LICENCE_TAG_REISSUE:
309                  case LICENCE_TAG_RESULT:                  case LICENCE_TAG_RESULT:
310                          break;                          break;
311    
312                  default:                  default:
313                          NOTIMP("licence tag 0x%x\n", tag);                          unimpl("licence tag 0x%x\n", tag);
314          }          }
315  }  }
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