/[rdesktop]/sourceforge.net/tags/RDESKTOP-1-3-1/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 30 by matty, Fri Sep 14 13:51:38 2001 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
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    #ifdef SAVE_LICENCE
63    /* Present an existing licence to the server */
64    static void
65    licence_present(uint8 * client_random, uint8 * rsa_data,
66                    uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature)
67    {
68            uint32 sec_flags = SEC_LICENCE_NEG;
69            uint16 length =
70                    16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE +
71                    licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE;
72            STREAM s;
73    
74            s = sec_init(sec_flags, length + 4);
75    
76            out_uint16_le(s, LICENCE_TAG_PRESENT);
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    #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;
110          uint16 hostlen = strlen(host) + 1;          uint16 hostlen = strlen(host) + 1;
111          uint16 length = 120 + userlen + hostlen;          uint16 length = 128 + userlen + hostlen;
112          STREAM s;          STREAM s;
113    
114          s = sec_init(sec_flags, length + 2);          s = sec_init(sec_flags, length + 2);
# Line 65  licence_send_request(uint8 *client_rando Line 117  licence_send_request(uint8 *client_rando
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 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    #ifdef SAVE_LICENCE
148            uint8 signature[LICENCE_SIGNATURE_SIZE];
149            uint8 hwid[LICENCE_HWID_SIZE];
150            uint8 *licence_data;
151            int licence_size;
152            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 100  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          /* Send a certificate request back to the server */  #ifdef SAVE_LICENCE
164            licence_size = load_licence(&licence_data);
165            if (licence_size != -1)
166            {
167                    /* 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;
178            }
179    #endif
180    
181          licence_send_request(null_data, null_data, username, hostname);          licence_send_request(null_data, null_data, username, hostname);
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 133  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 157  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 172  licence_process_authreq(STREAM s) Line 248  licence_process_authreq(STREAM s)
248          RC4_set_key(&crypt_key, 16, licence_key);          RC4_set_key(&crypt_key, 16, licence_key);
249          RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);          RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);
250    
         /* Construct HWID */  
         buf_out_uint32(hwid, 2);  
         strncpy(hwid + 4, hostname, LICENCE_HWID_SIZE - 4);  
   
251          /* Generate a signature for a buffer of token and HWID */          /* Generate a signature for a buffer of token and HWID */
252            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, 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 215  licence_process_issue(STREAM s) Line 283  licence_process_issue(STREAM s)
283    
284          licence_issued = True;          licence_issued = True;
285    
286          /* We should save the licence here */  #ifdef SAVE_LICENCE
287            save_licence(s->p, length - 2);
288    #endif
289  }  }
290    
291  /* Process a licence packet */  /* Process a licence packet */
# Line 241  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    
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