reactos/base/applications/mstsc/licence.c

   1 /* -*- c-basic-offset: 8 -*-
   2    rdesktop: A Remote Desktop Protocol client.
   3    RDP licensing negotiation
   4    Copyright (C) Matthew Chapman <matthewc.unsw.edu.au> 1999-2008
   5    Copyright (C) Thomas Uhle <thomas.uhle@mailbox.tu-dresden.de> 2011
   6    Copyright (C) Henrik Andersson <henrik.andersson@cendio.com> 2014
   7
   8
   9    This program is free software: you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation, either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "precomp.h"
  24
  25 void *
  26 rdssl_rc4_info_create(void);
  27 void
  28 rdssl_rc4_info_delete(void * rc4_info);
  29 void
  30 rdssl_rc4_set_key(void * rc4_info, char * key, int len);
  31 void
  32 rdssl_rc4_crypt(void * rc4_info, char * in_data, char * out_data, int len);
  33 int
  34 rdssl_mod_exp(char* out, int out_len, char* in, int in_len,
  35               char* mod, int mod_len, char* exp, int exp_len);
  36
  37 extern char g_username[256];
  38 extern char g_hostname[256];
  39 extern RDP_VERSION g_rdp_version;
  40
  41 static uint8 g_licence_key[16];
  42 static uint8 g_licence_sign_key[16];
  43
  44 RD_BOOL g_licence_issued = False;
  45 RD_BOOL g_licence_error_result = False;
  46
  47 /* Generate a session key and RC4 keys, given client and server randoms */
  48 static void
  49 licence_generate_keys(uint8 * client_random, uint8 * server_random, uint8 * pre_master_secret)
  50 {
  51         uint8 master_secret[48];
  52         uint8 key_block[48];
  53
  54         /* Generate master secret and then key material */
  55         sec_hash_48(master_secret, pre_master_secret, client_random, server_random, 'A');
  56         sec_hash_48(key_block, master_secret, server_random, client_random, 'A');
  57
  58         /* Store first 16 bytes of session key as MAC secret */
  59         memcpy(g_licence_sign_key, key_block, 16);
  60
  61         /* Generate RC4 key from next 16 bytes */
  62         sec_hash_16(g_licence_key, &key_block[16], client_random, server_random);
  63 }
  64
  65 static void
  66 licence_generate_hwid(uint8 * hwid)
  67 {
  68         buf_out_uint32(hwid, 2);
  69         strncpy((char *) (hwid + 4), g_hostname, LICENCE_HWID_SIZE - 4);
  70 }
  71
  72 /* Send a lincece info packet to server */
  73 static void
  74 licence_info(uint8 * client_random, uint8 * rsa_data,
  75              uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature)
  76 {
  77         uint32 sec_flags = SEC_LICENSE_PKT;
  78         uint16 length =
  79                 24 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE +
  80                 licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE;
  81         STREAM s;
  82
  83         s = sec_init(sec_flags, length + 2);
  84
  85         out_uint8(s, LICENCE_TAG_LICENCE_INFO);
  86         out_uint8(s, ((g_rdp_version >= RDP_V5) ? 3 : 2));      /* version */
  87         out_uint16_le(s, length);
  88
  89         out_uint32_le(s, 1);
  90         out_uint16(s, 0);
  91         out_uint16_le(s, 0x0201);
  92
  93         out_uint8p(s, client_random, SEC_RANDOM_SIZE);
  94         out_uint16_le(s, 2);
  95         out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE));
  96         out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);
  97         out_uint8s(s, SEC_PADDING_SIZE);
  98
  99         out_uint16_le(s, 1);
 100         out_uint16_le(s, licence_size);
 101         out_uint8p(s, licence_data, licence_size);
 102
 103         out_uint16_le(s, 1);
 104         out_uint16_le(s, LICENCE_HWID_SIZE);
 105         out_uint8p(s, hwid, LICENCE_HWID_SIZE);
 106
 107         out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE);
 108
 109         s_mark_end(s);
 110         sec_send(s, sec_flags);
 111 }
 112
 113 /* Send a new licence request packet */
 114 static void
 115 licence_send_new_licence_request(uint8 * client_random, uint8 * rsa_data, char *user, char *host)
 116 {
 117         uint32 sec_flags = SEC_LICENSE_PKT;
 118         uint16 userlen = strlen(user) + 1;
 119         uint16 hostlen = strlen(host) + 1;
 120         uint16 length =
 121                 24 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE + userlen + hostlen;
 122         STREAM s;
 123
 124         s = sec_init(sec_flags, length + 2);
 125
 126         out_uint8(s, LICENCE_TAG_NEW_LICENCE_REQUEST);
 127         out_uint8(s, ((g_rdp_version >= RDP_V5) ? 3 : 2));      /* version */
 128         out_uint16_le(s, length);
 129
 130         out_uint32_le(s, 1);    // KEY_EXCHANGE_ALG_RSA
 131         out_uint16(s, 0);
 132         out_uint16_le(s, 0xff01);
 133
 134         out_uint8p(s, client_random, SEC_RANDOM_SIZE);
 135         out_uint16_le(s, 2);
 136         out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE));
 137         out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);
 138         out_uint8s(s, SEC_PADDING_SIZE);
 139
 140         /* Username LICENSE_BINARY_BLOB */
 141         out_uint16_le(s, BB_CLIENT_USER_NAME_BLOB);
 142         out_uint16_le(s, userlen);
 143         out_uint8p(s, user, userlen);
 144
 145         /* Machinename LICENSE_BINARY_BLOB */
 146         out_uint16_le(s, BB_CLIENT_MACHINE_NAME_BLOB);
 147         out_uint16_le(s, hostlen);
 148         out_uint8p(s, host, hostlen);
 149
 150         s_mark_end(s);
 151         sec_send(s, sec_flags);
 152 }
 153
 154 /* Process a licence request packet */
 155 static void
 156 licence_process_request(STREAM s)
 157 {
 158         uint8 null_data[SEC_MODULUS_SIZE];
 159         uint8 *server_random;
 160         uint8 signature[LICENCE_SIGNATURE_SIZE];
 161         uint8 hwid[LICENCE_HWID_SIZE];
 162         uint8 *licence_data;
 163         int licence_size;
 164         void * crypt_key;
 165
 166         /* Retrieve the server random from the incoming packet */
 167         in_uint8p(s, server_random, SEC_RANDOM_SIZE);
 168
 169         /* We currently use null client keys. This is a bit naughty but, hey,
 170            the security of licence negotiation isn't exactly paramount. */
 171         memset(null_data, 0, sizeof(null_data));
 172         licence_generate_keys(null_data, server_random, null_data);
 173
 174         licence_size = load_licence(&licence_data);
 175         if (licence_size > 0)
 176         {
 177                 /* Generate a signature for the HWID buffer */
 178                 licence_generate_hwid(hwid);
 179                 sec_sign(signature, 16, g_licence_sign_key, 16, hwid, sizeof(hwid));
 180
 181                 /* Now encrypt the HWID */
 182                 crypt_key = rdssl_rc4_info_create();
 183                 rdssl_rc4_set_key(crypt_key, (char *)g_licence_key, 16);
 184                 rdssl_rc4_crypt(crypt_key, (char *)hwid, (char *)hwid, sizeof(hwid));
 185                 rdssl_rc4_info_delete(crypt_key);
 186
 187 #if WITH_DEBUG
 188                 DEBUG(("Sending licensing PDU (message type 0x%02x)\n", LICENCE_TAG_LICENCE_INFO));
 189 #endif
 190                 licence_info(null_data, null_data, licence_data, licence_size, hwid, signature);
 191
 192                 xfree(licence_data);
 193                 return;
 194         }
 195
 196 #if WITH_DEBUG
 197         DEBUG(("Sending licensing PDU (message type 0x%02x)\n", LICENCE_TAG_NEW_LICENCE_REQUEST));
 198 #endif
 199         licence_send_new_licence_request(null_data, null_data, g_username, g_hostname);
 200 }
 201
 202 /* Send a platform challenge response packet */
 203 static void
 204 licence_send_platform_challenge_response(uint8 * token, uint8 * crypt_hwid, uint8 * signature)
 205 {
 206         uint32 sec_flags = SEC_LICENSE_PKT;
 207         uint16 length = 58;
 208         STREAM s;
 209
 210         s = sec_init(sec_flags, length + 2);
 211
 212         out_uint8(s, LICENCE_TAG_PLATFORM_CHALLANGE_RESPONSE);
 213         out_uint8(s, ((g_rdp_version >= RDP_V5) ? 3 : 2));      /* version */
 214         out_uint16_le(s, length);
 215
 216         out_uint16_le(s, 1);
 217         out_uint16_le(s, LICENCE_TOKEN_SIZE);
 218         out_uint8p(s, token, LICENCE_TOKEN_SIZE);
 219
 220         out_uint16_le(s, 1);
 221         out_uint16_le(s, LICENCE_HWID_SIZE);
 222         out_uint8p(s, crypt_hwid, LICENCE_HWID_SIZE);
 223
 224         out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE);
 225
 226         s_mark_end(s);
 227         sec_send(s, sec_flags);
 228 }
 229
 230 /* Parse a platform challenge request packet */
 231 static RD_BOOL
 232 licence_parse_platform_challenge(STREAM s, uint8 ** token, uint8 ** signature)
 233 {
 234         uint16 tokenlen;
 235
 236         in_uint8s(s, 6);        /* unknown: f8 3d 15 00 04 f6 */
 237
 238         in_uint16_le(s, tokenlen);
 239         if (tokenlen != LICENCE_TOKEN_SIZE)
 240         {
 241                 error("token len %d\n", tokenlen);
 242                 return False;
 243         }
 244
 245         in_uint8p(s, *token, tokenlen);
 246         in_uint8p(s, *signature, LICENCE_SIGNATURE_SIZE);
 247
 248         return s_check_end(s);
 249 }
 250
 251 /* Process a platform challenge packet */
 252 static void
 253 licence_process_platform_challenge(STREAM s)
 254 {
 255         uint8 *in_token = NULL, *in_sig;
 256         uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE];
 257         uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];
 258         uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];
 259         uint8 out_sig[LICENCE_SIGNATURE_SIZE];
 260         void * crypt_key;
 261
 262         /* Parse incoming packet and save the encrypted token */
 263         licence_parse_platform_challenge(s, &in_token, &in_sig);
 264         memcpy(out_token, in_token, LICENCE_TOKEN_SIZE);
 265
 266         /* Decrypt the token. It should read TEST in Unicode. */
 267         crypt_key = rdssl_rc4_info_create();
 268         rdssl_rc4_set_key(crypt_key, (char *)g_licence_key, 16);
 269         rdssl_rc4_crypt(crypt_key, (char *)in_token, (char *)decrypt_token, LICENCE_TOKEN_SIZE);
 270         rdssl_rc4_info_delete(crypt_key);
 271
 272         /* Generate a signature for a buffer of token and HWID */
 273         licence_generate_hwid(hwid);
 274         memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);
 275         memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);
 276         sec_sign(out_sig, 16, g_licence_sign_key, 16, sealed_buffer, sizeof(sealed_buffer));
 277
 278         /* Now encrypt the HWID */
 279         crypt_key = rdssl_rc4_info_create();
 280         rdssl_rc4_set_key(crypt_key, (char *)g_licence_key, 16);
 281         rdssl_rc4_crypt(crypt_key, (char *)hwid, (char *)crypt_hwid, LICENCE_HWID_SIZE);
 282
 283         licence_send_platform_challenge_response(out_token, crypt_hwid, out_sig);
 284 }
 285
 286 /* Process a new licence packet */
 287 static void
 288 licence_process_new_license(STREAM s)
 289 {
 290         void * crypt_key;
 291         uint32 length;
 292         int i;
 293
 294         in_uint8s(s, 2);        // Skip license binary blob type
 295         in_uint16_le(s, length);
 296         if (!s_check_rem(s, length))
 297                 return;
 298
 299         crypt_key = rdssl_rc4_info_create();
 300         rdssl_rc4_set_key(crypt_key, (char *)g_licence_key, 16);
 301         rdssl_rc4_crypt(crypt_key, (char *)s->p, (char *)s->p, length);
 302         rdssl_rc4_info_delete(crypt_key);
 303
 304         /* Parse NEW_LICENSE_INFO block */
 305         in_uint8s(s, 4);        // skip dwVersion
 306
 307         /* Skip strings, Scope, CompanyName and ProductId to get
 308            to the LicenseInfo which we store in license blob. */
 309         length = 0;
 310         for (i = 0; i < 4; i++)
 311         {
 312                 in_uint8s(s, length);
 313                 in_uint32_le(s, length);
 314                 if (!s_check_rem(s, length))
 315                         return;
 316         }
 317
 318         g_licence_issued = True;
 319         save_licence(s->p, length);
 320 }
 321
 322 /* process a licence error alert packet */
 323 void
 324 licence_process_error_alert(STREAM s)
 325 {
 326         uint32 error_code;
 327         uint32 state_transition;
 328         uint32 error_info;
 329         in_uint32(s, error_code);
 330         in_uint32(s, state_transition);
 331         in_uint32(s, error_info);
 332
 333         /* There is a special case in the error alert handling, when licensing is all good
 334            and the server is not sending a license to client, a "Server License Error PDU -
 335            Valid Client" packet is sent which means, every thing is ok.
 336
 337            Therefor we should flag that everything is ok with license here.
 338          */
 339         if (error_code == 0x07)
 340         {
 341                 g_licence_issued = True;
 342                 return;
 343         }
 344
 345         /* handle error codes, for now, just report them */
 346         switch (error_code)
 347         {
 348                 case 0x6:       // ERR_NO_LICENSE_SERVER
 349                         warning("License error alert from server: No license server\n");
 350                         break;
 351
 352                 case 0x8:       // ERR_INVALID_CLIENT
 353                         warning("License error alert from server: Invalid client\n");
 354                         break;
 355
 356                 case 0x4:       // ERR_INVALID_SCOPE
 357                 case 0xb:       // ERR_INVALID_PRODUCTID
 358                 case 0xc:       // ERR_INVALID_MESSAGE_LENGTH
 359                 default:
 360                         warning("License error alert from server: code %u, state transition %u\n",
 361                                 error_code, state_transition);
 362                         break;
 363         }
 364
 365         /* handle error codes, for now, just report them */
 366         switch (error_info)
 367         {
 368                 default:
 369                         break;
 370         }
 371
 372         g_licence_error_result = True;
 373 }
 374
 375
 376 /* Process a licence packet */
 377 void
 378 licence_process(STREAM s)
 379 {
 380         uint8 tag;
 381
 382         in_uint8(s, tag);
 383         in_uint8s(s, 3);        /* version, length */
 384
 385 #if WITH_DEBUG
 386         DEBUG(("Received licensing PDU (message type 0x%02x)\n", tag));
 387 #endif
 388
 389         switch (tag)
 390         {
 391                 case LICENCE_TAG_REQUEST:
 392                         licence_process_request(s);
 393                         break;
 394
 395                 case LICENCE_TAG_PLATFORM_CHALLANGE:
 396                         licence_process_platform_challenge(s);
 397                         break;
 398
 399                 case LICENCE_TAG_NEW_LICENCE:
 400                 case LICENCE_TAG_UPGRADE_LICENCE:
 401                         /* we can handle new and upgrades of licences the same way. */
 402                         licence_process_new_license(s);
 403                         break;
 404
 405                 case LICENCE_TAG_ERROR_ALERT:
 406                         licence_process_error_alert(s);
 407                         break;
 408
 409                 default:
 410                         unimpl("licence tag 0x%02x\n", tag);
 411         }
 412 }