/[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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Diff of /sourceforge.net/trunk/rdesktop/licence.c

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revision 61 by matthewc, Sun Jul 14 12:06:03 2002 UTC revision 293 by astrand, Tue Jan 21 20:22:44 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 1999-2001     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
# 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 32  BOOL licence_issued = False; Line 36  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  static 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 49  licence_generate_keys(uint8 *client_key, Line 53  licence_generate_keys(uint8 *client_key,
53  }  }
54    
55  static void  static void
56  licence_generate_hwid(uint8 *hwid)  licence_generate_hwid(uint8 * hwid)
57  {  {
58          buf_out_uint32(hwid, 2);          buf_out_uint32(hwid, 2);
59          strncpy(hwid + 4, hostname, LICENCE_HWID_SIZE - 4);          strncpy((char *) (hwid + 4), hostname, LICENCE_HWID_SIZE - 4);
60  }  }
61    
62    #ifdef SAVE_LICENCE
63  /* Present an existing licence to the server */  /* Present an existing licence to the server */
64  static void  static void
65  licence_present(uint8 *client_random, uint8 *rsa_data,  licence_present(uint8 * client_random, uint8 * rsa_data,
66                  uint8 *licence_data, int licence_size,                  uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature)
                 uint8 *hwid, uint8 *signature)  
67  {  {
68          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
69          uint16 length = 16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE          uint16 length =
70                          + licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE;                  16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE +
71                    licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE;
72          STREAM s;          STREAM s;
73    
74          s = sec_init(sec_flags, length + 4);          s = sec_init(sec_flags, length + 4);
# Line 94  licence_present(uint8 *client_random, ui Line 99  licence_present(uint8 *client_random, ui
99          s_mark_end(s);          s_mark_end(s);
100          sec_send(s, sec_flags);          sec_send(s, sec_flags);
101  }  }
102    #endif
103    
104  /* Send a licence request packet */  /* Send a licence request packet */
105  static void  static void
106  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)  
107  {  {
108          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
109          uint16 userlen = strlen(user) + 1;          uint16 userlen = strlen(user) + 1;
# Line 138  static void Line 143  static void
143  licence_process_demand(STREAM s)  licence_process_demand(STREAM s)
144  {  {
145          uint8 null_data[SEC_MODULUS_SIZE];          uint8 null_data[SEC_MODULUS_SIZE];
         uint8 hwid[LICENCE_HWID_SIZE];  
         uint8 signature[LICENCE_SIGNATURE_SIZE];  
146          uint8 *server_random;          uint8 *server_random;
147    #ifdef SAVE_LICENCE
148            uint8 signature[LICENCE_SIGNATURE_SIZE];
149            uint8 hwid[LICENCE_HWID_SIZE];
150          uint8 *licence_data;          uint8 *licence_data;
151          int licence_size;          int licence_size;
152          RC4_KEY crypt_key;          RC4_KEY crypt_key;
153    #endif
154    
155          /* Retrieve the server random from the incoming packet */          /* Retrieve the server random from the incoming packet */
156          in_uint8p(s, server_random, SEC_RANDOM_SIZE);          in_uint8p(s, server_random, SEC_RANDOM_SIZE);
# Line 153  licence_process_demand(STREAM s) Line 160  licence_process_demand(STREAM s)
160          memset(null_data, 0, sizeof(null_data));          memset(null_data, 0, sizeof(null_data));
161          licence_generate_keys(null_data, server_random, null_data);          licence_generate_keys(null_data, server_random, null_data);
162    
163    #ifdef SAVE_LICENCE
164          licence_size = load_licence(&licence_data);          licence_size = load_licence(&licence_data);
165          if (licence_size == -1)          if (licence_size != -1)
166          {          {
167                  licence_send_request(null_data, null_data, username, hostname);                  /* Generate a signature for the HWID buffer */
168                    licence_generate_hwid(hwid);
169                    sec_sign(signature, 16, licence_sign_key, 16, hwid, sizeof(hwid));
170    
171                    /* Now encrypt the HWID */
172                    RC4_set_key(&crypt_key, 16, licence_key);
173                    RC4(&crypt_key, sizeof(hwid), hwid, hwid);
174    
175                    licence_present(null_data, null_data, licence_data, licence_size, hwid, signature);
176                    xfree(licence_data);
177                  return;                  return;
178          }          }
179    #endif
180    
181          /* Generate a signature for the HWID buffer */          licence_send_request(null_data, null_data, username, hostname);
         licence_generate_hwid(hwid);  
         sec_sign(signature, 16, licence_sign_key, 16, hwid, sizeof(hwid));  
   
         /* Now encrypt the HWID */  
         RC4_set_key(&crypt_key, 16, licence_key);  
         RC4(&crypt_key, sizeof(hwid), hwid, hwid);  
   
         licence_present(null_data, null_data, licence_data, licence_size,  
                                         hwid, signature);  
         xfree(licence_data);  
182  }  }
183    
184  /* Send an authentication response packet */  /* Send an authentication response packet */
185  static void  static void
186  licence_send_authresp(uint8 *token, uint8 *crypt_hwid, uint8 *signature)  licence_send_authresp(uint8 * token, uint8 * crypt_hwid, uint8 * signature)
187  {  {
188          uint32 sec_flags = SEC_LICENCE_NEG;          uint32 sec_flags = SEC_LICENCE_NEG;
189          uint16 length = 58;          uint16 length = 58;
# Line 202  licence_send_authresp(uint8 *token, uint Line 210  licence_send_authresp(uint8 *token, uint
210    
211  /* Parse an authentication request packet */  /* Parse an authentication request packet */
212  static BOOL  static BOOL
213  licence_parse_authreq(STREAM s, uint8 **token, uint8 **signature)  licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature)
214  {  {
215          uint16 tokenlen;          uint16 tokenlen;
216    
# Line 226  static void Line 234  static void
234  licence_process_authreq(STREAM s)  licence_process_authreq(STREAM s)
235  {  {
236          uint8 *in_token, *in_sig;          uint8 *in_token, *in_sig;
237          uint8 out_token[LICENCE_TOKEN_SIZE],          uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE];
                 decrypt_token[LICENCE_TOKEN_SIZE];  
238          uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];          uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];
239          uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];          uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];
240          uint8 out_sig[LICENCE_SIGNATURE_SIZE];          uint8 out_sig[LICENCE_SIGNATURE_SIZE];
# Line 245  licence_process_authreq(STREAM s) Line 252  licence_process_authreq(STREAM s)
252          licence_generate_hwid(hwid);          licence_generate_hwid(hwid);
253          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);          memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);
254          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);          memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);
255          sec_sign(out_sig, 16, 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));  
256    
257          /* Now encrypt the HWID */          /* Now encrypt the HWID */
258          RC4_set_key(&crypt_key, 16, licence_key);          RC4_set_key(&crypt_key, 16, licence_key);
# Line 280  licence_process_issue(STREAM s) Line 282  licence_process_issue(STREAM s)
282                  return;                  return;
283    
284          licence_issued = True;          licence_issued = True;
285          save_licence(s->p, length-2);  
286    #ifdef SAVE_LICENCE
287            save_licence(s->p, length - 2);
288    #endif
289  }  }
290    
291  /* Process a licence packet */  /* Process a licence packet */
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