1/* 2 Unix SMB/Netbios implementation. 3 Version 3.0 4 handle NLTMSSP, client server side parsing 5 6 Copyright (C) Andrew Tridgell 2001 7 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005 8 Copyright (C) Stefan Metzmacher 2005 9 10 This program is free software; you can redistribute it and/or modify 11 it under the terms of the GNU General Public License as published by 12 the Free Software Foundation; either version 3 of the License, or 13 (at your option) any later version. 14 15 This program is distributed in the hope that it will be useful, 16 but WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 GNU General Public License for more details. 19 20 You should have received a copy of the GNU General Public License 21 along with this program. If not, see <http://www.gnu.org/licenses/>. 22*/ 23 24#include "includes.h" 25#include "system/network.h" 26#include "auth/ntlmssp/ntlmssp.h" 27#include "../librpc/gen_ndr/ntlmssp.h" 28#include "../libcli/auth/libcli_auth.h" 29#include "../lib/crypto/crypto.h" 30#include "auth/gensec/gensec.h" 31#include "auth/auth.h" 32#include "auth/ntlm/auth_proto.h" 33#include "param/param.h" 34#include "auth/session_proto.h" 35 36/** 37 * Set a username on an NTLMSSP context - ensures it is talloc()ed 38 * 39 */ 40 41static NTSTATUS ntlmssp_set_username(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *user) 42{ 43 if (!user) { 44 /* it should be at least "" */ 45 DEBUG(1, ("NTLMSSP failed to set username - cannot accept NULL username\n")); 46 return NT_STATUS_INVALID_PARAMETER; 47 } 48 gensec_ntlmssp_state->user = talloc_strdup(gensec_ntlmssp_state, user); 49 if (!gensec_ntlmssp_state->user) { 50 return NT_STATUS_NO_MEMORY; 51 } 52 return NT_STATUS_OK; 53} 54 55/** 56 * Set a domain on an NTLMSSP context - ensures it is talloc()ed 57 * 58 */ 59static NTSTATUS ntlmssp_set_domain(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *domain) 60{ 61 gensec_ntlmssp_state->domain = talloc_strdup(gensec_ntlmssp_state, domain); 62 if (!gensec_ntlmssp_state->domain) { 63 return NT_STATUS_NO_MEMORY; 64 } 65 return NT_STATUS_OK; 66} 67 68/** 69 * Set a workstation on an NTLMSSP context - ensures it is talloc()ed 70 * 71 */ 72static NTSTATUS ntlmssp_set_workstation(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *workstation) 73{ 74 gensec_ntlmssp_state->workstation = talloc_strdup(gensec_ntlmssp_state, workstation); 75 if (!gensec_ntlmssp_state->workstation) { 76 return NT_STATUS_NO_MEMORY; 77 } 78 return NT_STATUS_OK; 79} 80 81/** 82 * Determine correct target name flags for reply, given server role 83 * and negotiated flags 84 * 85 * @param gensec_ntlmssp_state NTLMSSP State 86 * @param neg_flags The flags from the packet 87 * @param chal_flags The flags to be set in the reply packet 88 * @return The 'target name' string. 89 */ 90 91static const char *ntlmssp_target_name(struct gensec_ntlmssp_state *gensec_ntlmssp_state, 92 uint32_t neg_flags, uint32_t *chal_flags) 93{ 94 if (neg_flags & NTLMSSP_REQUEST_TARGET) { 95 *chal_flags |= NTLMSSP_NEGOTIATE_TARGET_INFO; 96 *chal_flags |= NTLMSSP_REQUEST_TARGET; 97 if (gensec_ntlmssp_state->server_role == ROLE_STANDALONE) { 98 *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER; 99 return gensec_ntlmssp_state->server_name; 100 } else { 101 *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN; 102 return gensec_ntlmssp_state->domain; 103 }; 104 } else { 105 return ""; 106 } 107} 108 109 110 111/** 112 * Next state function for the Negotiate packet 113 * 114 * @param gensec_security GENSEC state 115 * @param out_mem_ctx Memory context for *out 116 * @param in The request, as a DATA_BLOB. reply.data must be NULL 117 * @param out The reply, as an allocated DATA_BLOB, caller to free. 118 * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required. 119 */ 120 121NTSTATUS ntlmssp_server_negotiate(struct gensec_security *gensec_security, 122 TALLOC_CTX *out_mem_ctx, 123 const DATA_BLOB in, DATA_BLOB *out) 124{ 125 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data; 126 DATA_BLOB struct_blob; 127 uint32_t neg_flags = 0; 128 uint32_t ntlmssp_command, chal_flags; 129 const uint8_t *cryptkey; 130 const char *target_name; 131 132 /* parse the NTLMSSP packet */ 133#if 0 134 file_save("ntlmssp_negotiate.dat", request.data, request.length); 135#endif 136 137 if (in.length) { 138 if ((in.length < 16) || !msrpc_parse(out_mem_ctx, 139 &in, "Cdd", 140 "NTLMSSP", 141 &ntlmssp_command, 142 &neg_flags)) { 143 DEBUG(1, ("ntlmssp_server_negotiate: failed to parse " 144 "NTLMSSP Negotiate of length %u:\n", 145 (unsigned int)in.length )); 146 dump_data(2, in.data, in.length); 147 return NT_STATUS_INVALID_PARAMETER; 148 } 149 debug_ntlmssp_flags(neg_flags); 150 } 151 152 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, neg_flags, gensec_ntlmssp_state->allow_lm_key); 153 154 /* Ask our caller what challenge they would like in the packet */ 155 cryptkey = gensec_ntlmssp_state->get_challenge(gensec_ntlmssp_state); 156 if (!cryptkey) { 157 DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge\n")); 158 return NT_STATUS_INTERNAL_ERROR; 159 } 160 161 /* Check if we may set the challenge */ 162 if (!gensec_ntlmssp_state->may_set_challenge(gensec_ntlmssp_state)) { 163 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2; 164 } 165 166 /* The flags we send back are not just the negotiated flags, 167 * they are also 'what is in this packet'. Therfore, we 168 * operate on 'chal_flags' from here on 169 */ 170 171 chal_flags = gensec_ntlmssp_state->neg_flags; 172 173 /* get the right name to fill in as 'target' */ 174 target_name = ntlmssp_target_name(gensec_ntlmssp_state, 175 neg_flags, &chal_flags); 176 if (target_name == NULL) 177 return NT_STATUS_INVALID_PARAMETER; 178 179 gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8); 180 gensec_ntlmssp_state->internal_chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8); 181 182 /* This creates the 'blob' of names that appears at the end of the packet */ 183 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) { 184 char dnsdomname[MAXHOSTNAMELEN], dnsname[MAXHOSTNAMELEN]; 185 const char *target_name_dns = ""; 186 187 /* Find out the DNS domain name */ 188 dnsdomname[0] = '\0'; 189 safe_strcpy(dnsdomname, lp_realm(gensec_security->settings->lp_ctx), sizeof(dnsdomname) - 1); 190 strlower_m(dnsdomname); 191 192 /* Find out the DNS host name */ 193 safe_strcpy(dnsname, gensec_ntlmssp_state->server_name, sizeof(dnsname) - 1); 194 if (dnsdomname[0] != '\0') { 195 safe_strcat(dnsname, ".", sizeof(dnsname) - 1); 196 safe_strcat(dnsname, dnsdomname, sizeof(dnsname) - 1); 197 } 198 strlower_m(dnsname); 199 200 if (chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN) { 201 target_name_dns = dnsdomname; 202 } else if (chal_flags |= NTLMSSP_TARGET_TYPE_SERVER) { 203 target_name_dns = dnsname; 204 } 205 206 msrpc_gen(out_mem_ctx, 207 &struct_blob, "aaaaa", 208 MsvAvNbDomainName, target_name, 209 MsvAvNbComputerName, gensec_ntlmssp_state->server_name, 210 MsvAvDnsDomainName, dnsdomname, 211 MsvAvDnsComputerName, dnsname, 212 MsvAvEOL, ""); 213 } else { 214 struct_blob = data_blob(NULL, 0); 215 } 216 217 { 218 /* Marshal the packet in the right format, be it unicode or ASCII */ 219 const char *gen_string; 220 if (gensec_ntlmssp_state->unicode) { 221 gen_string = "CdUdbddB"; 222 } else { 223 gen_string = "CdAdbddB"; 224 } 225 226 msrpc_gen(out_mem_ctx, 227 out, gen_string, 228 "NTLMSSP", 229 NTLMSSP_CHALLENGE, 230 target_name, 231 chal_flags, 232 cryptkey, 8, 233 0, 0, 234 struct_blob.data, struct_blob.length); 235 } 236 237 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH; 238 239 return NT_STATUS_MORE_PROCESSING_REQUIRED; 240} 241 242/** 243 * Next state function for the Authenticate packet 244 * 245 * @param gensec_ntlmssp_state NTLMSSP State 246 * @param request The request, as a DATA_BLOB 247 * @return Errors or NT_STATUS_OK. 248 */ 249 250static NTSTATUS ntlmssp_server_preauth(struct gensec_ntlmssp_state *gensec_ntlmssp_state, 251 const DATA_BLOB request) 252{ 253 uint32_t ntlmssp_command, auth_flags; 254 NTSTATUS nt_status; 255 256 uint8_t session_nonce_hash[16]; 257 258 const char *parse_string; 259 char *domain = NULL; 260 char *user = NULL; 261 char *workstation = NULL; 262 263#if 0 264 file_save("ntlmssp_auth.dat", request.data, request.length); 265#endif 266 267 if (gensec_ntlmssp_state->unicode) { 268 parse_string = "CdBBUUUBd"; 269 } else { 270 parse_string = "CdBBAAABd"; 271 } 272 273 /* zero these out */ 274 data_blob_free(&gensec_ntlmssp_state->lm_resp); 275 data_blob_free(&gensec_ntlmssp_state->nt_resp); 276 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); 277 278 gensec_ntlmssp_state->user = NULL; 279 gensec_ntlmssp_state->domain = NULL; 280 gensec_ntlmssp_state->workstation = NULL; 281 282 /* now the NTLMSSP encoded auth hashes */ 283 if (!msrpc_parse(gensec_ntlmssp_state, 284 &request, parse_string, 285 "NTLMSSP", 286 &ntlmssp_command, 287 &gensec_ntlmssp_state->lm_resp, 288 &gensec_ntlmssp_state->nt_resp, 289 &domain, 290 &user, 291 &workstation, 292 &gensec_ntlmssp_state->encrypted_session_key, 293 &auth_flags)) { 294 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n")); 295 dump_data(10, request.data, request.length); 296 297 /* zero this out */ 298 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); 299 auth_flags = 0; 300 301 /* Try again with a shorter string (Win9X truncates this packet) */ 302 if (gensec_ntlmssp_state->unicode) { 303 parse_string = "CdBBUUU"; 304 } else { 305 parse_string = "CdBBAAA"; 306 } 307 308 /* now the NTLMSSP encoded auth hashes */ 309 if (!msrpc_parse(gensec_ntlmssp_state, 310 &request, parse_string, 311 "NTLMSSP", 312 &ntlmssp_command, 313 &gensec_ntlmssp_state->lm_resp, 314 &gensec_ntlmssp_state->nt_resp, 315 &domain, 316 &user, 317 &workstation)) { 318 DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n")); 319 dump_data(2, request.data, request.length); 320 321 return NT_STATUS_INVALID_PARAMETER; 322 } 323 } 324 325 if (auth_flags) 326 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key); 327 328 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) { 329 /* zero this out */ 330 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); 331 return nt_status; 332 } 333 334 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(gensec_ntlmssp_state, user))) { 335 /* zero this out */ 336 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); 337 return nt_status; 338 } 339 340 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) { 341 /* zero this out */ 342 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); 343 return nt_status; 344 } 345 346 DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n", 347 gensec_ntlmssp_state->user, gensec_ntlmssp_state->domain, gensec_ntlmssp_state->workstation, (unsigned long)gensec_ntlmssp_state->lm_resp.length, (unsigned long)gensec_ntlmssp_state->nt_resp.length)); 348 349#if 0 350 file_save("nthash1.dat", &gensec_ntlmssp_state->nt_resp.data, &gensec_ntlmssp_state->nt_resp.length); 351 file_save("lmhash1.dat", &gensec_ntlmssp_state->lm_resp.data, &gensec_ntlmssp_state->lm_resp.length); 352#endif 353 354 /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a 355 client challenge 356 357 However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful. 358 */ 359 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) { 360 if (gensec_ntlmssp_state->nt_resp.length == 24 && gensec_ntlmssp_state->lm_resp.length == 24) { 361 struct MD5Context md5_session_nonce_ctx; 362 SMB_ASSERT(gensec_ntlmssp_state->internal_chal.data 363 && gensec_ntlmssp_state->internal_chal.length == 8); 364 365 gensec_ntlmssp_state->doing_ntlm2 = true; 366 367 memcpy(gensec_ntlmssp_state->crypt.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8); 368 memcpy(&gensec_ntlmssp_state->crypt.ntlm2.session_nonce[8], gensec_ntlmssp_state->lm_resp.data, 8); 369 370 MD5Init(&md5_session_nonce_ctx); 371 MD5Update(&md5_session_nonce_ctx, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 16); 372 MD5Final(session_nonce_hash, &md5_session_nonce_ctx); 373 374 gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, 375 session_nonce_hash, 8); 376 377 /* LM response is no longer useful, zero it out */ 378 data_blob_free(&gensec_ntlmssp_state->lm_resp); 379 380 /* We changed the effective challenge - set it */ 381 if (!NT_STATUS_IS_OK(nt_status = 382 gensec_ntlmssp_state->set_challenge(gensec_ntlmssp_state, 383 &gensec_ntlmssp_state->chal))) { 384 /* zero this out */ 385 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); 386 return nt_status; 387 } 388 389 /* LM Key is incompatible... */ 390 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; 391 } 392 } 393 return NT_STATUS_OK; 394} 395 396/** 397 * Next state function for the Authenticate packet 398 * (after authentication - figures out the session keys etc) 399 * 400 * @param gensec_ntlmssp_state NTLMSSP State 401 * @return Errors or NT_STATUS_OK. 402 */ 403 404static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security, 405 DATA_BLOB *user_session_key, 406 DATA_BLOB *lm_session_key) 407{ 408 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data; 409 NTSTATUS nt_status; 410 DATA_BLOB session_key = data_blob(NULL, 0); 411 412 if (user_session_key) 413 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length); 414 415 if (lm_session_key) 416 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length); 417 418 /* Handle the different session key derivation for NTLM2 */ 419 if (gensec_ntlmssp_state->doing_ntlm2) { 420 if (user_session_key && user_session_key->data && user_session_key->length == 16) { 421 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16); 422 hmac_md5(user_session_key->data, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 423 sizeof(gensec_ntlmssp_state->crypt.ntlm2.session_nonce), session_key.data); 424 DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n")); 425 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length); 426 427 } else { 428 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n")); 429 session_key = data_blob(NULL, 0); 430 } 431 } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) 432 /* Ensure we can never get here on NTLMv2 */ 433 && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) { 434 435 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) { 436 if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) { 437 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16); 438 SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_ntlmssp_state->lm_resp.data, 439 session_key.data); 440 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n")); 441 dump_data_pw("LM session key:\n", session_key.data, session_key.length); 442 } else { 443 444 /* When there is no LM response, just use zeros */ 445 static const uint8_t zeros[24]; 446 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16); 447 SMBsesskeygen_lm_sess_key(zeros, zeros, 448 session_key.data); 449 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n")); 450 dump_data_pw("LM session key:\n", session_key.data, session_key.length); 451 } 452 } else { 453 /* LM Key not selected */ 454 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; 455 456 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n")); 457 session_key = data_blob(NULL, 0); 458 } 459 460 } else if (user_session_key && user_session_key->data) { 461 session_key = data_blob_talloc(gensec_ntlmssp_state, user_session_key->data, user_session_key->length); 462 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n")); 463 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length); 464 465 /* LM Key not selected */ 466 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; 467 468 } else if (lm_session_key && lm_session_key->data) { 469 /* Very weird to have LM key, but no user session key, but anyway.. */ 470 session_key = data_blob_talloc(gensec_ntlmssp_state, lm_session_key->data, lm_session_key->length); 471 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n")); 472 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length); 473 474 /* LM Key not selected */ 475 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; 476 477 } else { 478 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n")); 479 session_key = data_blob(NULL, 0); 480 481 /* LM Key not selected */ 482 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; 483 } 484 485 /* With KEY_EXCH, the client supplies the proposed session key, 486 but encrypts it with the long-term key */ 487 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) { 488 if (!gensec_ntlmssp_state->encrypted_session_key.data 489 || gensec_ntlmssp_state->encrypted_session_key.length != 16) { 490 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); 491 DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n", 492 (unsigned)gensec_ntlmssp_state->encrypted_session_key.length)); 493 return NT_STATUS_INVALID_PARAMETER; 494 } else if (!session_key.data || session_key.length != 16) { 495 DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n", 496 (unsigned)session_key.length)); 497 gensec_ntlmssp_state->session_key = session_key; 498 } else { 499 dump_data_pw("KEY_EXCH session key (enc):\n", 500 gensec_ntlmssp_state->encrypted_session_key.data, 501 gensec_ntlmssp_state->encrypted_session_key.length); 502 arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data, 503 session_key.data, 504 gensec_ntlmssp_state->encrypted_session_key.length); 505 gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state, 506 gensec_ntlmssp_state->encrypted_session_key.data, 507 gensec_ntlmssp_state->encrypted_session_key.length); 508 dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data, 509 gensec_ntlmssp_state->encrypted_session_key.length); 510 talloc_free(session_key.data); 511 } 512 } else { 513 gensec_ntlmssp_state->session_key = session_key; 514 } 515 516 if ((gensec_security->want_features & GENSEC_FEATURE_SIGN) 517 || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) { 518 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state); 519 } else { 520 nt_status = NT_STATUS_OK; 521 } 522 523 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); 524 525 /* allow arbitarily many authentications, but watch that this will cause a 526 memory leak, until the gensec_ntlmssp_state is shutdown 527 */ 528 529 if (gensec_ntlmssp_state->server_multiple_authentications) { 530 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH; 531 } else { 532 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE; 533 } 534 535 return nt_status; 536} 537 538 539/** 540 * Next state function for the Authenticate packet 541 * 542 * @param gensec_security GENSEC state 543 * @param out_mem_ctx Memory context for *out 544 * @param in The request, as a DATA_BLOB. reply.data must be NULL 545 * @param out The reply, as an allocated DATA_BLOB, caller to free. 546 * @return Errors or NT_STATUS_OK if authentication sucessful 547 */ 548 549NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security, 550 TALLOC_CTX *out_mem_ctx, 551 const DATA_BLOB in, DATA_BLOB *out) 552{ 553 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data; 554 DATA_BLOB user_session_key = data_blob(NULL, 0); 555 DATA_BLOB lm_session_key = data_blob(NULL, 0); 556 NTSTATUS nt_status; 557 558 TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx); 559 if (!mem_ctx) { 560 return NT_STATUS_NO_MEMORY; 561 } 562 563 /* zero the outbound NTLMSSP packet */ 564 *out = data_blob_talloc(out_mem_ctx, NULL, 0); 565 566 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in))) { 567 talloc_free(mem_ctx); 568 return nt_status; 569 } 570 571 /* 572 * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth 573 * is required (by "ntlm auth = no" and "lm auth = no" being set in the 574 * smb.conf file) and no NTLMv2 response was sent then the password check 575 * will fail here. JRA. 576 */ 577 578 /* Finally, actually ask if the password is OK */ 579 580 if (!NT_STATUS_IS_OK(nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state, mem_ctx, 581 &user_session_key, &lm_session_key))) { 582 talloc_free(mem_ctx); 583 return nt_status; 584 } 585 586 if (gensec_security->want_features 587 & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY)) { 588 nt_status = ntlmssp_server_postauth(gensec_security, &user_session_key, &lm_session_key); 589 talloc_free(mem_ctx); 590 return nt_status; 591 } else { 592 gensec_ntlmssp_state->session_key = data_blob(NULL, 0); 593 talloc_free(mem_ctx); 594 return NT_STATUS_OK; 595 } 596} 597 598/** 599 * Return the challenge as determined by the authentication subsystem 600 * @return an 8 byte random challenge 601 */ 602 603static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state) 604{ 605 NTSTATUS status; 606 const uint8_t *chal; 607 608 status = gensec_ntlmssp_state->auth_context->get_challenge(gensec_ntlmssp_state->auth_context, &chal); 609 if (!NT_STATUS_IS_OK(status)) { 610 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n", 611 nt_errstr(status))); 612 return NULL; 613 } 614 615 return chal; 616} 617 618/** 619 * Some authentication methods 'fix' the challenge, so we may not be able to set it 620 * 621 * @return If the effective challenge used by the auth subsystem may be modified 622 */ 623static bool auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state) 624{ 625 return gensec_ntlmssp_state->auth_context->challenge_may_be_modified(gensec_ntlmssp_state->auth_context); 626} 627 628/** 629 * NTLM2 authentication modifies the effective challenge, 630 * @param challenge The new challenge value 631 */ 632static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge) 633{ 634 NTSTATUS nt_status; 635 struct auth_context *auth_context = gensec_ntlmssp_state->auth_context; 636 const uint8_t *chal; 637 638 if (challenge->length != 8) { 639 return NT_STATUS_INVALID_PARAMETER; 640 } 641 642 chal = challenge->data; 643 644 nt_status = gensec_ntlmssp_state->auth_context->set_challenge(auth_context, 645 chal, 646 "NTLMSSP callback (NTLM2)"); 647 648 return nt_status; 649} 650 651/** 652 * Check the password on an NTLMSSP login. 653 * 654 * Return the session keys used on the connection. 655 */ 656 657static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state, 658 TALLOC_CTX *mem_ctx, 659 DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key) 660{ 661 NTSTATUS nt_status; 662 struct auth_usersupplied_info *user_info = talloc(mem_ctx, struct auth_usersupplied_info); 663 if (!user_info) { 664 return NT_STATUS_NO_MEMORY; 665 } 666 667 user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT; 668 user_info->flags = 0; 669 user_info->mapped_state = false; 670 user_info->client.account_name = gensec_ntlmssp_state->user; 671 user_info->client.domain_name = gensec_ntlmssp_state->domain; 672 user_info->workstation_name = gensec_ntlmssp_state->workstation; 673 user_info->remote_host = gensec_get_peer_addr(gensec_ntlmssp_state->gensec_security); 674 675 user_info->password_state = AUTH_PASSWORD_RESPONSE; 676 user_info->password.response.lanman = gensec_ntlmssp_state->lm_resp; 677 user_info->password.response.lanman.data = talloc_steal(user_info, gensec_ntlmssp_state->lm_resp.data); 678 user_info->password.response.nt = gensec_ntlmssp_state->nt_resp; 679 user_info->password.response.nt.data = talloc_steal(user_info, gensec_ntlmssp_state->nt_resp.data); 680 681 nt_status = gensec_ntlmssp_state->auth_context->check_password(gensec_ntlmssp_state->auth_context, 682 mem_ctx, 683 user_info, 684 &gensec_ntlmssp_state->server_info); 685 talloc_free(user_info); 686 NT_STATUS_NOT_OK_RETURN(nt_status); 687 688 talloc_steal(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info); 689 690 if (gensec_ntlmssp_state->server_info->user_session_key.length) { 691 DEBUG(10, ("Got NT session key of length %u\n", 692 (unsigned)gensec_ntlmssp_state->server_info->user_session_key.length)); 693 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->user_session_key.data)) { 694 return NT_STATUS_NO_MEMORY; 695 } 696 697 *user_session_key = gensec_ntlmssp_state->server_info->user_session_key; 698 } 699 if (gensec_ntlmssp_state->server_info->lm_session_key.length) { 700 DEBUG(10, ("Got LM session key of length %u\n", 701 (unsigned)gensec_ntlmssp_state->server_info->lm_session_key.length)); 702 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->lm_session_key.data)) { 703 return NT_STATUS_NO_MEMORY; 704 } 705 706 *lm_session_key = gensec_ntlmssp_state->server_info->lm_session_key; 707 } 708 return nt_status; 709} 710 711/** 712 * Return the credentials of a logged on user, including session keys 713 * etc. 714 * 715 * Only valid after a successful authentication 716 * 717 * May only be called once per authentication. 718 * 719 */ 720 721NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security, 722 struct auth_session_info **session_info) 723{ 724 NTSTATUS nt_status; 725 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data; 726 727 nt_status = auth_generate_session_info(gensec_ntlmssp_state, gensec_security->event_ctx, gensec_security->settings->lp_ctx, gensec_ntlmssp_state->server_info, session_info); 728 NT_STATUS_NOT_OK_RETURN(nt_status); 729 730 (*session_info)->session_key = data_blob_talloc(*session_info, 731 gensec_ntlmssp_state->session_key.data, 732 gensec_ntlmssp_state->session_key.length); 733 734 return NT_STATUS_OK; 735} 736 737/** 738 * Start NTLMSSP on the server side 739 * 740 */ 741NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security) 742{ 743 NTSTATUS nt_status; 744 struct gensec_ntlmssp_state *gensec_ntlmssp_state; 745 746 nt_status = gensec_ntlmssp_start(gensec_security); 747 NT_STATUS_NOT_OK_RETURN(nt_status); 748 749 gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data; 750 751 gensec_ntlmssp_state->role = NTLMSSP_SERVER; 752 753 gensec_ntlmssp_state->workstation = NULL; 754 gensec_ntlmssp_state->server_name = lp_netbios_name(gensec_security->settings->lp_ctx); 755 756 gensec_ntlmssp_state->domain = lp_workgroup(gensec_security->settings->lp_ctx); 757 758 gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE; 759 760 gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth(gensec_security->settings->lp_ctx) 761 && gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "allow_lm_key", false)); 762 763 gensec_ntlmssp_state->server_multiple_authentications = false; 764 765 gensec_ntlmssp_state->neg_flags = 766 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION; 767 768 gensec_ntlmssp_state->lm_resp = data_blob(NULL, 0); 769 gensec_ntlmssp_state->nt_resp = data_blob(NULL, 0); 770 gensec_ntlmssp_state->encrypted_session_key = data_blob(NULL, 0); 771 772 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) { 773 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128; 774 } 775 776 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) { 777 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56; 778 } 779 780 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) { 781 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH; 782 } 783 784 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) { 785 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN; 786 } 787 788 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) { 789 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2; 790 } 791 792 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) { 793 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN; 794 } 795 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) { 796 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL; 797 } 798 799 gensec_ntlmssp_state->auth_context = gensec_security->auth_context; 800 801 gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge; 802 gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge; 803 gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge; 804 gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password; 805 gensec_ntlmssp_state->server_role = lp_server_role(gensec_security->settings->lp_ctx); 806 807 return NT_STATUS_OK; 808} 809 810