/[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 963 by astrand, Wed Aug 3 10:56:16 2005 UTC
# Line 1  Line 1 
1  /*  /* -*- c-basic-offset: 8 -*-
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 1999-2005
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  #include "crypto/rc4.h"  #include <openssl/rc4.h>
23    
24  extern char username[16];  extern char g_username[64];
25  extern char hostname[16];  extern char g_hostname[16];
 extern BOOL licence;  
26    
27  static uint8 licence_key[16];  static uint8 g_licence_key[16];
28  static uint8 licence_sign_key[16];  static uint8 g_licence_sign_key[16];
29    
30    BOOL g_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_random, uint8 * server_random, uint8 * pre_master_secret)
35  {  {
36          uint8 session_key[48];          uint8 master_secret[48];
37          uint8 temp_hash[48];          uint8 key_block[48];
38    
39            /* Generate master secret and then key material */
40            sec_hash_48(master_secret, pre_master_secret, client_random, server_random, 'A');
41            sec_hash_48(key_block, master_secret, server_random, client_random, 'A');
42    
43          /* Generate session key - two rounds of sec_hash_48 */          /* Store first 16 bytes of session key as MAC secret */
44          sec_hash_48(temp_hash, client_rsa, client_key, server_key, 65);          memcpy(g_licence_sign_key, key_block, 16);
         sec_hash_48(session_key, temp_hash, server_key, client_key, 65);  
45    
46          /* Store first 16 bytes of session key, for generating signatures */          /* Generate RC4 key from next 16 bytes */
47          memcpy(licence_sign_key, session_key, 16);          sec_hash_16(g_licence_key, &key_block[16], client_random, server_random);
48    }
49    
50          /* Generate RC4 key */  static void
51          sec_hash_16(licence_key, &session_key[16], client_key, server_key);  licence_generate_hwid(uint8 * hwid)
52    {
53            buf_out_uint32(hwid, 2);
54            strncpy((char *) (hwid + 4), g_hostname, LICENCE_HWID_SIZE - 4);
55    }
56    
57    /* Present an existing licence to the server */
58    static void
59    licence_present(uint8 * client_random, uint8 * rsa_data,
60                    uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature)
61    {
62            uint32 sec_flags = SEC_LICENCE_NEG;
63            uint16 length =
64                    16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE +
65                    licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE;
66            STREAM s;
67    
68            s = sec_init(sec_flags, length + 4);
69    
70            out_uint8(s, LICENCE_TAG_PRESENT);
71            out_uint8(s, 2);        /* version */
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);
109    
110          out_uint16_le(s, LICENCE_TAG_REQUEST);          out_uint8(s, LICENCE_TAG_REQUEST);
111            out_uint8(s, 2);        /* version */
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 71  licence_send_request(uint8 *client_rando Line 121  licence_send_request(uint8 *client_rando
121          out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);          out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);
122          out_uint8s(s, SEC_PADDING_SIZE);          out_uint8s(s, SEC_PADDING_SIZE);
123    
124          out_uint16(s, LICENCE_TAG_USER);          out_uint16_le(s, LICENCE_TAG_USER);
125          out_uint16(s, userlen);          out_uint16_le(s, userlen);
126          out_uint8p(s, user, userlen);          out_uint8p(s, user, userlen);
127    
128          out_uint16(s, LICENCE_TAG_HOST);          out_uint16_le(s, LICENCE_TAG_HOST);
129          out_uint16(s, hostlen);          out_uint16_le(s, hostlen);
130          out_uint8p(s, host, hostlen);          out_uint8p(s, host, hostlen);
131    
132          s_mark_end(s);          s_mark_end(s);
# 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            uint8 signature[LICENCE_SIGNATURE_SIZE];
143            uint8 hwid[LICENCE_HWID_SIZE];
144            uint8 *licence_data;
145            int licence_size;
146            RC4_KEY crypt_key;
147    
148          /* Retrieve the server random from the incoming packet */          /* Retrieve the server random from the incoming packet */
149          in_uint8p(s, server_random, SEC_RANDOM_SIZE);          in_uint8p(s, server_random, SEC_RANDOM_SIZE);
# Line 98  licence_process_demand(STREAM s) Line 153  licence_process_demand(STREAM s)
153          memset(null_data, 0, sizeof(null_data));          memset(null_data, 0, sizeof(null_data));
154          licence_generate_keys(null_data, server_random, null_data);          licence_generate_keys(null_data, server_random, null_data);
155    
156          /* Send a certificate request back to the server */          licence_size = load_licence(&licence_data);
157          licence_send_request(null_data, null_data, username, hostname);          if (licence_size > 0)
158            {
159                    /* Generate a signature for the HWID buffer */
160                    licence_generate_hwid(hwid);
161                    sec_sign(signature, 16, g_licence_sign_key, 16, hwid, sizeof(hwid));
162    
163                    /* Now encrypt the HWID */
164                    RC4_set_key(&crypt_key, 16, g_licence_key);
165                    RC4(&crypt_key, sizeof(hwid), hwid, hwid);
166    
167                    licence_present(null_data, null_data, licence_data, licence_size, hwid, signature);
168                    xfree(licence_data);
169                    return;
170            }
171    
172            licence_send_request(null_data, null_data, g_username, g_hostname);
173  }  }
174    
175  /* Send an authentication response packet */  /* Send an authentication response packet */
176  static void  static void
177  licence_send_authresp(uint8 *token, uint8 *crypt_hwid, uint8 *signature)  licence_send_authresp(uint8 * token, uint8 * crypt_hwid, uint8 * signature)
178  {  {
179          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
180          uint16 length = 58;          uint16 length = 58;
# Line 112  licence_send_authresp(uint8 *token, uint Line 182  licence_send_authresp(uint8 *token, uint
182    
183          s = sec_init(sec_flags, length + 2);          s = sec_init(sec_flags, length + 2);
184    
185          out_uint16_le(s, LICENCE_TAG_AUTHRESP);          out_uint8(s, LICENCE_TAG_AUTHRESP);
186            out_uint8(s, 2);        /* version */
187          out_uint16_le(s, length);          out_uint16_le(s, length);
188    
189          out_uint16_le(s, 1);          out_uint16_le(s, 1);
# Line 131  licence_send_authresp(uint8 *token, uint Line 202  licence_send_authresp(uint8 *token, uint
202    
203  /* Parse an authentication request packet */  /* Parse an authentication request packet */
204  static BOOL  static BOOL
205  licence_parse_authreq(STREAM s, uint8 **token, uint8 **signature)  licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature)
206  {  {
207          uint16 tokenlen;          uint16 tokenlen;
208    
# Line 140  licence_parse_authreq(STREAM s, uint8 ** Line 211  licence_parse_authreq(STREAM s, uint8 **
211          in_uint16_le(s, tokenlen);          in_uint16_le(s, tokenlen);
212          if (tokenlen != LICENCE_TOKEN_SIZE)          if (tokenlen != LICENCE_TOKEN_SIZE)
213          {          {
214                  ERROR("token len %d\n", tokenlen);                  error("token len %d\n", tokenlen);
215                  return False;                  return False;
216          }          }
217    
# Line 155  static void Line 226  static void
226  licence_process_authreq(STREAM s)  licence_process_authreq(STREAM s)
227  {  {
228          uint8 *in_token, *in_sig;          uint8 *in_token, *in_sig;
229          uint8 out_token[LICENCE_TOKEN_SIZE],          uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE];
                 decrypt_token[LICENCE_TOKEN_SIZE];  
230          uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];          uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];
231          uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];          uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];
232          uint8 out_sig[LICENCE_SIGNATURE_SIZE];          uint8 out_sig[LICENCE_SIGNATURE_SIZE];
# Line 167  licence_process_authreq(STREAM s) Line 237  licence_process_authreq(STREAM s)
237          memcpy(out_token, in_token, LICENCE_TOKEN_SIZE);          memcpy(out_token, in_token, LICENCE_TOKEN_SIZE);
238    
239          /* Decrypt the token. It should read TEST in Unicode. */          /* Decrypt the token. It should read TEST in Unicode. */
240          RC4_set_key(&crypt_key, 16, licence_key);          RC4_set_key(&crypt_key, 16, g_licence_key);
241          RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);          RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);
242    
         /* Construct HWID */  
         buf_out_uint32(hwid, 2);  
         strncpy(hwid + 4, hostname, LICENCE_HWID_SIZE - 4);  
   
243          /* Generate a signature for a buffer of token and HWID */          /* Generate a signature for a buffer of token and HWID */
244            licence_generate_hwid(hwid);
245          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);
246          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);
247          sec_sign(out_sig, licence_sign_key, 16,          sec_sign(out_sig, 16, g_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));  
248    
249          /* Now encrypt the HWID */          /* Now encrypt the HWID */
250          RC4_set_key(&crypt_key, 16, licence_key);          RC4_set_key(&crypt_key, 16, g_licence_key);
251          RC4(&crypt_key, LICENCE_HWID_SIZE, hwid, crypt_hwid);          RC4(&crypt_key, LICENCE_HWID_SIZE, hwid, crypt_hwid);
252    
253          licence_send_authresp(out_token, crypt_hwid, out_sig);          licence_send_authresp(out_token, crypt_hwid, out_sig);
# Line 198  licence_process_issue(STREAM s) Line 260  licence_process_issue(STREAM s)
260          RC4_KEY crypt_key;          RC4_KEY crypt_key;
261          uint32 length;          uint32 length;
262          uint16 check;          uint16 check;
263            int i;
264    
265          in_uint8s(s, 2);        /* 3d 45 - unknown */          in_uint8s(s, 2);        /* 3d 45 - unknown */
266          in_uint16_le(s, length);          in_uint16_le(s, length);
267          if (!s_check_rem(s, length))          if (!s_check_rem(s, length))
268                  return;                  return;
269    
270          RC4_set_key(&crypt_key, 16, licence_key);          RC4_set_key(&crypt_key, 16, g_licence_key);
271          RC4(&crypt_key, length, s->p, s->p);          RC4(&crypt_key, length, s->p, s->p);
272    
273          in_uint16(s, check);          in_uint16(s, check);
274          if (check != 0)          if (check != 0)
275                  return;                  return;
276    
277          /* We should save the licence here */          g_licence_issued = True;
278          STATUS("Server issued licence.\n");  
279            in_uint8s(s, 2);        /* pad */
280    
281            /* advance to fourth string */
282            length = 0;
283            for (i = 0; i < 4; i++)
284            {
285                    in_uint8s(s, length);
286                    in_uint32_le(s, length);
287                    if (!s_check_rem(s, length))
288                            return;
289            }
290    
291            g_licence_issued = True;
292            save_licence(s->p, length);
293  }  }
294    
295  /* Process a licence packet */  /* Process a licence packet */
296  void  void
297  licence_process(STREAM s)  licence_process(STREAM s)
298  {  {
299          uint16 tag;          uint8 tag;
300    
301          in_uint16_le(s, tag);          in_uint8(s, tag);
302          in_uint8s(s, 2);        /* length */          in_uint8s(s, 3);        /* version, length */
303    
304          switch (tag)          switch (tag)
305          {          {
# Line 238  licence_process(STREAM s) Line 315  licence_process(STREAM s)
315                          licence_process_issue(s);                          licence_process_issue(s);
316                          break;                          break;
317    
318                    case LICENCE_TAG_REISSUE:
319                  case LICENCE_TAG_RESULT:                  case LICENCE_TAG_RESULT:
320                          break;                          break;
321    
322                  default:                  default:
323                          NOTIMP("licence tag 0x%x\n", tag);                          unimpl("licence tag 0x%x\n", tag);
324          }          }
325  }  }
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