1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright 2015 Nexenta Systems, Inc. All rights reserved. 25 */ 26 27 /* 28 * NETR challenge/response client functions. 29 * 30 * NT_STATUS_INVALID_PARAMETER 31 * NT_STATUS_NO_TRUST_SAM_ACCOUNT 32 * NT_STATUS_ACCESS_DENIED 33 */ 34 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <strings.h> 38 #include <unistd.h> 39 #include <ctype.h> 40 #include <security/cryptoki.h> 41 #include <security/pkcs11.h> 42 43 #include <smbsrv/libsmb.h> 44 #include <smbsrv/libsmbns.h> 45 #include <smbsrv/libmlsvc.h> 46 #include <smbsrv/ndl/netlogon.ndl> 47 #include <smbsrv/smbinfo.h> 48 #include <smbsrv/netrauth.h> 49 50 #define NETR_SESSKEY_ZEROBUF_SZ 4 51 /* The DES algorithm uses a 56-bit encryption key. */ 52 #define NETR_DESKEY_LEN 7 53 54 int netr_setup_authenticator(netr_info_t *, struct netr_authenticator *, 55 struct netr_authenticator *); 56 DWORD netr_validate_chain(netr_info_t *, struct netr_authenticator *); 57 58 static int netr_server_req_challenge(mlsvc_handle_t *, netr_info_t *); 59 static int netr_server_authenticate2(mlsvc_handle_t *, netr_info_t *); 60 static int netr_gen_password(BYTE *, BYTE *, BYTE *); 61 62 /* 63 * Shared with netr_logon.c 64 */ 65 netr_info_t netr_global_info; 66 67 /* 68 * netlogon_auth 69 * 70 * This is the core of the NETLOGON authentication protocol. 71 * Do the challenge response authentication. 72 * 73 * Prior to calling this function, an anonymous session to the NETLOGON 74 * pipe on a domain controller(server) should have already been opened. 75 * 76 * Upon a successful NETLOGON credential chain establishment, the 77 * netlogon sequence number will be set to match the kpasswd sequence 78 * number. 79 * 80 */ 81 DWORD 82 netlogon_auth(char *server, mlsvc_handle_t *netr_handle, DWORD flags) 83 { 84 netr_info_t *netr_info; 85 int rc; 86 DWORD leout_rc[2]; 87 88 netr_info = &netr_global_info; 89 bzero(netr_info, sizeof (netr_info_t)); 90 91 netr_info->flags |= flags; 92 93 rc = smb_getnetbiosname(netr_info->hostname, NETBIOS_NAME_SZ); 94 if (rc != 0) 95 return (NT_STATUS_UNSUCCESSFUL); 96 97 /* server is our DC. Note: normally an FQDN. */ 98 (void) snprintf(netr_info->server, sizeof (netr_info->server), 99 "\\\\%s", server); 100 101 LE_OUT32(&leout_rc[0], random()); 102 LE_OUT32(&leout_rc[1], random()); 103 (void) memcpy(&netr_info->client_challenge, leout_rc, 104 sizeof (struct netr_credential)); 105 106 if ((rc = netr_server_req_challenge(netr_handle, netr_info)) == 0) { 107 rc = netr_server_authenticate2(netr_handle, netr_info); 108 if (rc == 0) { 109 /* 110 * TODO: (later) When joining a domain using a 111 * pre-created machine account, should do: 112 * netr_server_password_set(&netr_handle, netr_info); 113 * Nexenta issue 11960 114 */ 115 smb_update_netlogon_seqnum(); 116 netr_info->flags |= NETR_FLG_VALID; 117 118 } 119 } 120 121 return ((rc) ? NT_STATUS_UNSUCCESSFUL : NT_STATUS_SUCCESS); 122 } 123 124 /* 125 * netr_open 126 * 127 * Open an anonymous session to the NETLOGON pipe on a domain controller 128 * and bind to the NETR RPC interface. 129 * 130 * We store the remote server information, which is used to drive Windows 131 * version specific behavior. 132 * 133 * Returns 0 or NT status 134 */ 135 DWORD 136 netr_open(char *server, char *domain, mlsvc_handle_t *netr_handle) 137 { 138 char user[SMB_USERNAME_MAXLEN]; 139 DWORD status; 140 141 smb_ipc_get_user(user, SMB_USERNAME_MAXLEN); 142 143 status = ndr_rpc_bind(netr_handle, server, domain, user, "NETR"); 144 145 return (status); 146 } 147 148 /* 149 * netr_close 150 * 151 * Close a NETLOGON pipe and free the RPC context. 152 */ 153 int 154 netr_close(mlsvc_handle_t *netr_handle) 155 { 156 ndr_rpc_unbind(netr_handle); 157 return (0); 158 } 159 160 /* 161 * netr_server_req_challenge 162 */ 163 static int 164 netr_server_req_challenge(mlsvc_handle_t *netr_handle, netr_info_t *netr_info) 165 { 166 struct netr_ServerReqChallenge arg; 167 int opnum; 168 169 bzero(&arg, sizeof (struct netr_ServerReqChallenge)); 170 opnum = NETR_OPNUM_ServerReqChallenge; 171 172 arg.servername = (unsigned char *)netr_info->server; 173 arg.hostname = (unsigned char *)netr_info->hostname; 174 175 (void) memcpy(&arg.client_challenge, &netr_info->client_challenge, 176 sizeof (struct netr_credential)); 177 178 if (ndr_rpc_call(netr_handle, opnum, &arg) != 0) 179 return (-1); 180 181 if (arg.status != 0) { 182 ndr_rpc_status(netr_handle, opnum, arg.status); 183 ndr_rpc_release(netr_handle); 184 return (-1); 185 } 186 187 (void) memcpy(&netr_info->server_challenge, &arg.server_challenge, 188 sizeof (struct netr_credential)); 189 190 ndr_rpc_release(netr_handle); 191 return (0); 192 } 193 194 /* 195 * netr_server_authenticate2 196 */ 197 static int 198 netr_server_authenticate2(mlsvc_handle_t *netr_handle, netr_info_t *netr_info) 199 { 200 struct netr_ServerAuthenticate2 arg; 201 /* sizeof netr_info->hostname, + 1 for the '$' */ 202 char account_name[(NETBIOS_NAME_SZ * 2) + 1]; 203 int opnum; 204 int rc; 205 206 bzero(&arg, sizeof (struct netr_ServerAuthenticate2)); 207 opnum = NETR_OPNUM_ServerAuthenticate2; 208 209 (void) snprintf(account_name, sizeof (account_name), "%s$", 210 netr_info->hostname); 211 212 smb_tracef("server=[%s] account_name=[%s] hostname=[%s]\n", 213 netr_info->server, account_name, netr_info->hostname); 214 215 arg.servername = (unsigned char *)netr_info->server; 216 arg.account_name = (unsigned char *)account_name; 217 arg.account_type = NETR_WKSTA_TRUST_ACCOUNT_TYPE; 218 arg.hostname = (unsigned char *)netr_info->hostname; 219 arg.negotiate_flags = NETR_NEGOTIATE_BASE_FLAGS; 220 221 if (ndr_rpc_server_os(netr_handle) == NATIVE_OS_WIN2000) { 222 arg.negotiate_flags |= NETR_NEGOTIATE_STRONGKEY_FLAG; 223 if (netr_gen_skey128(netr_info) != SMBAUTH_SUCCESS) 224 return (-1); 225 } else { 226 if (netr_gen_skey64(netr_info) != SMBAUTH_SUCCESS) 227 return (-1); 228 } 229 230 if (netr_gen_credentials(netr_info->session_key.key, 231 &netr_info->client_challenge, 0, 232 &netr_info->client_credential) != SMBAUTH_SUCCESS) { 233 return (-1); 234 } 235 236 if (netr_gen_credentials(netr_info->session_key.key, 237 &netr_info->server_challenge, 0, 238 &netr_info->server_credential) != SMBAUTH_SUCCESS) { 239 return (-1); 240 } 241 242 (void) memcpy(&arg.client_credential, &netr_info->client_credential, 243 sizeof (struct netr_credential)); 244 245 if (ndr_rpc_call(netr_handle, opnum, &arg) != 0) 246 return (-1); 247 248 if (arg.status != 0) { 249 ndr_rpc_status(netr_handle, opnum, arg.status); 250 ndr_rpc_release(netr_handle); 251 return (-1); 252 } 253 254 rc = memcmp(&netr_info->server_credential, &arg.server_credential, 255 sizeof (struct netr_credential)); 256 257 ndr_rpc_release(netr_handle); 258 return (rc); 259 } 260 261 /* 262 * netr_gen_skey128 263 * 264 * Generate a 128-bit session key from the client and server challenges. 265 * See "Session-Key Computation" section of MS-NRPC document. 266 */ 267 int 268 netr_gen_skey128(netr_info_t *netr_info) 269 { 270 unsigned char ntlmhash[SMBAUTH_HASH_SZ]; 271 int rc = SMBAUTH_FAILURE; 272 CK_RV rv; 273 CK_MECHANISM mechanism; 274 CK_SESSION_HANDLE hSession; 275 CK_ULONG diglen = MD_DIGEST_LEN; 276 unsigned char md5digest[MD_DIGEST_LEN]; 277 unsigned char zerobuf[NETR_SESSKEY_ZEROBUF_SZ]; 278 279 bzero(ntlmhash, SMBAUTH_HASH_SZ); 280 /* 281 * We should check (netr_info->flags & NETR_FLG_INIT) and use 282 * the appropriate password but it isn't working yet. So we 283 * always use the default one for now. 284 */ 285 bzero(netr_info->password, sizeof (netr_info->password)); 286 rc = smb_config_getstr(SMB_CI_MACHINE_PASSWD, 287 (char *)netr_info->password, sizeof (netr_info->password)); 288 289 if ((rc != SMBD_SMF_OK) || *netr_info->password == '\0') { 290 return (SMBAUTH_FAILURE); 291 } 292 293 rc = smb_auth_ntlm_hash((char *)netr_info->password, ntlmhash); 294 if (rc != SMBAUTH_SUCCESS) 295 return (SMBAUTH_FAILURE); 296 297 bzero(zerobuf, NETR_SESSKEY_ZEROBUF_SZ); 298 299 mechanism.mechanism = CKM_MD5; 300 mechanism.pParameter = 0; 301 mechanism.ulParameterLen = 0; 302 303 rv = SUNW_C_GetMechSession(mechanism.mechanism, &hSession); 304 if (rv != CKR_OK) 305 return (SMBAUTH_FAILURE); 306 307 rv = C_DigestInit(hSession, &mechanism); 308 if (rv != CKR_OK) 309 goto cleanup; 310 311 rv = C_DigestUpdate(hSession, (CK_BYTE_PTR)zerobuf, 312 NETR_SESSKEY_ZEROBUF_SZ); 313 if (rv != CKR_OK) 314 goto cleanup; 315 316 rv = C_DigestUpdate(hSession, 317 (CK_BYTE_PTR)netr_info->client_challenge.data, NETR_CRED_DATA_SZ); 318 if (rv != CKR_OK) 319 goto cleanup; 320 321 rv = C_DigestUpdate(hSession, 322 (CK_BYTE_PTR)netr_info->server_challenge.data, NETR_CRED_DATA_SZ); 323 if (rv != CKR_OK) 324 goto cleanup; 325 326 rv = C_DigestFinal(hSession, (CK_BYTE_PTR)md5digest, &diglen); 327 if (rv != CKR_OK) 328 goto cleanup; 329 330 rc = smb_auth_hmac_md5(md5digest, diglen, ntlmhash, SMBAUTH_HASH_SZ, 331 netr_info->session_key.key); 332 333 netr_info->session_key.len = NETR_SESSKEY128_SZ; 334 cleanup: 335 (void) C_CloseSession(hSession); 336 return (rc); 337 338 } 339 /* 340 * netr_gen_skey64 341 * 342 * Generate a 64-bit session key from the client and server challenges. 343 * See "Session-Key Computation" section of MS-NRPC document. 344 * 345 * The algorithm is a two stage hash. For the first hash, the input is 346 * the combination of the client and server challenges, the key is 347 * the first 7 bytes of the password. The initial password is formed 348 * using the NT password hash on the local hostname in lower case. 349 * The result is stored in a temporary buffer. 350 * 351 * input: challenge 352 * key: passwd lower 7 bytes 353 * output: intermediate result 354 * 355 * For the second hash, the input is the result of the first hash and 356 * the key is the last 7 bytes of the password. 357 * 358 * input: result of first hash 359 * key: passwd upper 7 bytes 360 * output: session_key 361 * 362 * The final output should be the session key. 363 * 364 * FYI: smb_auth_DES(output, key, input) 365 * 366 * If any difficulties occur using the cryptographic framework, the 367 * function returns SMBAUTH_FAILURE. Otherwise SMBAUTH_SUCCESS is 368 * returned. 369 */ 370 int 371 netr_gen_skey64(netr_info_t *netr_info) 372 { 373 unsigned char md4hash[32]; 374 unsigned char buffer[8]; 375 DWORD data[2]; 376 DWORD *client_challenge; 377 DWORD *server_challenge; 378 int rc; 379 DWORD le_data[2]; 380 381 client_challenge = (DWORD *)(uintptr_t)&netr_info->client_challenge; 382 server_challenge = (DWORD *)(uintptr_t)&netr_info->server_challenge; 383 bzero(md4hash, 32); 384 385 /* 386 * We should check (netr_info->flags & NETR_FLG_INIT) and use 387 * the appropriate password but it isn't working yet. So we 388 * always use the default one for now. 389 */ 390 bzero(netr_info->password, sizeof (netr_info->password)); 391 rc = smb_config_getstr(SMB_CI_MACHINE_PASSWD, 392 (char *)netr_info->password, sizeof (netr_info->password)); 393 394 if ((rc != SMBD_SMF_OK) || *netr_info->password == '\0') { 395 return (SMBAUTH_FAILURE); 396 } 397 398 rc = smb_auth_ntlm_hash((char *)netr_info->password, md4hash); 399 400 if (rc != SMBAUTH_SUCCESS) 401 return (SMBAUTH_FAILURE); 402 403 data[0] = LE_IN32(&client_challenge[0]) + LE_IN32(&server_challenge[0]); 404 data[1] = LE_IN32(&client_challenge[1]) + LE_IN32(&server_challenge[1]); 405 LE_OUT32(&le_data[0], data[0]); 406 LE_OUT32(&le_data[1], data[1]); 407 rc = smb_auth_DES(buffer, 8, md4hash, NETR_DESKEY_LEN, 408 (unsigned char *)le_data, 8); 409 410 if (rc != SMBAUTH_SUCCESS) 411 return (rc); 412 413 netr_info->session_key.len = NETR_SESSKEY64_SZ; 414 rc = smb_auth_DES(netr_info->session_key.key, 415 netr_info->session_key.len, &md4hash[9], NETR_DESKEY_LEN, buffer, 416 8); 417 418 return (rc); 419 } 420 421 /* 422 * netr_gen_credentials 423 * 424 * Generate a set of credentials from a challenge and a session key. 425 * The algorithm is a two stage hash. For the first hash, the 426 * timestamp is added to the challenge and the result is stored in a 427 * temporary buffer: 428 * 429 * input: challenge (including timestamp) 430 * key: session_key 431 * output: intermediate result 432 * 433 * For the second hash, the input is the result of the first hash and 434 * a strange partial key is used: 435 * 436 * input: result of first hash 437 * key: funny partial key 438 * output: credentiails 439 * 440 * The final output should be an encrypted set of credentials. 441 * 442 * FYI: smb_auth_DES(output, key, input) 443 * 444 * If any difficulties occur using the cryptographic framework, the 445 * function returns SMBAUTH_FAILURE. Otherwise SMBAUTH_SUCCESS is 446 * returned. 447 */ 448 int 449 netr_gen_credentials(BYTE *session_key, netr_cred_t *challenge, 450 DWORD timestamp, netr_cred_t *out_cred) 451 { 452 unsigned char buffer[8]; 453 DWORD data[2]; 454 DWORD le_data[2]; 455 DWORD *p; 456 int rc; 457 458 p = (DWORD *)(uintptr_t)challenge; 459 data[0] = LE_IN32(&p[0]) + timestamp; 460 data[1] = LE_IN32(&p[1]); 461 462 LE_OUT32(&le_data[0], data[0]); 463 LE_OUT32(&le_data[1], data[1]); 464 465 if (smb_auth_DES(buffer, 8, session_key, NETR_DESKEY_LEN, 466 (unsigned char *)le_data, 8) != SMBAUTH_SUCCESS) 467 return (SMBAUTH_FAILURE); 468 469 rc = smb_auth_DES(out_cred->data, 8, &session_key[NETR_DESKEY_LEN], 470 NETR_DESKEY_LEN, buffer, 8); 471 472 return (rc); 473 } 474 475 /* 476 * netr_server_password_set 477 * 478 * Attempt to change the trust account password for this system. 479 * 480 * Note that this call may legitimately fail if the registry on the 481 * domain controller has been setup to deny attempts to change the 482 * trust account password. In this case we should just continue to 483 * use the original password. 484 * 485 * Possible status values: 486 * NT_STATUS_ACCESS_DENIED 487 */ 488 int 489 netr_server_password_set(mlsvc_handle_t *netr_handle, netr_info_t *netr_info) 490 { 491 struct netr_PasswordSet arg; 492 int opnum; 493 BYTE new_password[NETR_OWF_PASSWORD_SZ]; 494 char account_name[NETBIOS_NAME_SZ * 2]; 495 496 bzero(&arg, sizeof (struct netr_PasswordSet)); 497 opnum = NETR_OPNUM_ServerPasswordSet; 498 499 (void) snprintf(account_name, sizeof (account_name), "%s$", 500 netr_info->hostname); 501 502 arg.servername = (unsigned char *)netr_info->server; 503 arg.account_name = (unsigned char *)account_name; 504 arg.sec_chan_type = NETR_WKSTA_TRUST_ACCOUNT_TYPE; 505 arg.hostname = (unsigned char *)netr_info->hostname; 506 507 /* 508 * Set up the client side authenticator. 509 */ 510 if (netr_setup_authenticator(netr_info, &arg.auth, 0) != 511 SMBAUTH_SUCCESS) { 512 return (-1); 513 } 514 515 /* 516 * Generate a new password from the old password. 517 */ 518 if (netr_gen_password(netr_info->session_key.key, 519 netr_info->password, new_password) == SMBAUTH_FAILURE) { 520 return (-1); 521 } 522 523 (void) memcpy(&arg.owf_password, &new_password, 524 NETR_OWF_PASSWORD_SZ); 525 526 if (ndr_rpc_call(netr_handle, opnum, &arg) != 0) 527 return (-1); 528 529 if (arg.status != 0) { 530 ndr_rpc_status(netr_handle, opnum, arg.status); 531 ndr_rpc_release(netr_handle); 532 return (-1); 533 } 534 535 /* 536 * Check the returned credentials. The server returns the new 537 * client credential rather than the new server credentiali, 538 * as documented elsewhere. 539 * 540 * Generate the new seed for the credential chain. Increment 541 * the timestamp and add it to the client challenge. Then we 542 * need to copy the challenge to the credential field in 543 * preparation for the next cycle. 544 */ 545 if (netr_validate_chain(netr_info, &arg.auth) == 0) { 546 /* 547 * Save the new password. 548 */ 549 (void) memcpy(netr_info->password, new_password, 550 NETR_OWF_PASSWORD_SZ); 551 } 552 553 ndr_rpc_release(netr_handle); 554 return (0); 555 } 556 557 /* 558 * netr_gen_password 559 * 560 * Generate a new pasword from the old password and the session key. 561 * The algorithm is a two stage hash. The session key is used in the 562 * first hash but only part of the session key is used in the second 563 * hash. 564 * 565 * If any difficulties occur using the cryptographic framework, the 566 * function returns SMBAUTH_FAILURE. Otherwise SMBAUTH_SUCCESS is 567 * returned. 568 */ 569 static int 570 netr_gen_password(BYTE *session_key, BYTE *old_password, BYTE *new_password) 571 { 572 int rv; 573 574 rv = smb_auth_DES(new_password, 8, session_key, NETR_DESKEY_LEN, 575 old_password, 8); 576 if (rv != SMBAUTH_SUCCESS) 577 return (rv); 578 579 rv = smb_auth_DES(&new_password[8], 8, &session_key[NETR_DESKEY_LEN], 580 NETR_DESKEY_LEN, &old_password[8], 8); 581 return (rv); 582 } 583 584 /* 585 * Todo: need netr_server_password_set2() 586 * used by "unsecure join". (NX 11960) 587 */ 588