source3/libsmb/ntlmssp.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    handle NLTMSSP, server side
   5
   6    Copyright (C) Andrew Tridgell      2001
   7    Copyright (C) Andrew Bartlett 2001-2010
   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 "../auth/ntlmssp/ntlmssp.h"
  26 #include "../auth/ntlmssp/ntlmssp_private.h"
  27 #include "../libcli/auth/libcli_auth.h"
  28 #include "../librpc/gen_ndr/ndr_ntlmssp.h"
  29 #include "../auth/ntlmssp/ntlmssp_ndr.h"
  30 #include "../lib/crypto/md5.h"
  31 #include "../lib/crypto/arcfour.h"
  32 #include "../lib/crypto/hmacmd5.h"
  33 #include "../nsswitch/libwbclient/wbclient.h"
  34
  35 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
  36                                        TALLOC_CTX *out_mem_ctx,
  37                                        DATA_BLOB reply, DATA_BLOB *next_request);
  38 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
  39                                          TALLOC_CTX *out_mem_ctx, /* Unused at this time */
  40                                          const DATA_BLOB reply, DATA_BLOB *next_request);
  41 /**
  42  * Callbacks for NTLMSSP - for both client and server operating modes
  43  *
  44  */
  45
  46 static const struct ntlmssp_callbacks {
  47         enum ntlmssp_role role;
  48         enum ntlmssp_message_type ntlmssp_command;
  49         NTSTATUS (*fn)(struct ntlmssp_state *ntlmssp_state,
  50                        TALLOC_CTX *out_mem_ctx,
  51                        DATA_BLOB in, DATA_BLOB *out);
  52 } ntlmssp_callbacks[] = {
  53         {NTLMSSP_CLIENT, NTLMSSP_INITIAL, ntlmssp_client_initial},
  54         {NTLMSSP_SERVER, NTLMSSP_NEGOTIATE, ntlmssp_server_negotiate},
  55         {NTLMSSP_CLIENT, NTLMSSP_CHALLENGE, ntlmssp_client_challenge},
  56         {NTLMSSP_SERVER, NTLMSSP_AUTH, ntlmssp_server_auth},
  57         {NTLMSSP_CLIENT, NTLMSSP_UNKNOWN, NULL},
  58         {NTLMSSP_SERVER, NTLMSSP_UNKNOWN, NULL}
  59 };
  60
  61
  62 /**
  63  * Default challenge generation code.
  64  *
  65  */
  66
  67 static NTSTATUS get_challenge(const struct ntlmssp_state *ntlmssp_state,
  68                               uint8_t chal[8])
  69 {
  70         generate_random_buffer(chal, 8);
  71         return NT_STATUS_OK;
  72 }
  73
  74 /**
  75  * Default 'we can set the challenge to anything we like' implementation
  76  *
  77  */
  78
  79 static bool may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
  80 {
  81         return True;
  82 }
  83
  84 /**
  85  * Default 'we can set the challenge to anything we like' implementation
  86  *
  87  * Does not actually do anything, as the value is always in the structure anyway.
  88  *
  89  */
  90
  91 static NTSTATUS set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
  92 {
  93         SMB_ASSERT(challenge->length == 8);
  94         return NT_STATUS_OK;
  95 }
  96
  97 /**
  98  * Set a username on an NTLMSSP context - ensures it is talloc()ed
  99  *
 100  */
 101
 102 NTSTATUS ntlmssp_set_username(struct ntlmssp_state *ntlmssp_state, const char *user)
 103 {
 104         ntlmssp_state->user = talloc_strdup(ntlmssp_state, user ? user : "" );
 105         if (!ntlmssp_state->user) {
 106                 return NT_STATUS_NO_MEMORY;
 107         }
 108         return NT_STATUS_OK;
 109 }
 110
 111 /**
 112  * Store NT and LM hashes on an NTLMSSP context - ensures they are talloc()ed
 113  *
 114  */
 115 NTSTATUS ntlmssp_set_hashes(struct ntlmssp_state *ntlmssp_state,
 116                             const uint8_t lm_hash[16],
 117                             const uint8_t nt_hash[16])
 118 {
 119         ntlmssp_state->lm_hash = (uint8_t *)
 120                 talloc_memdup(ntlmssp_state, lm_hash, 16);
 121         ntlmssp_state->nt_hash = (uint8_t *)
 122                 talloc_memdup(ntlmssp_state, nt_hash, 16);
 123         if (!ntlmssp_state->lm_hash || !ntlmssp_state->nt_hash) {
 124                 TALLOC_FREE(ntlmssp_state->lm_hash);
 125                 TALLOC_FREE(ntlmssp_state->nt_hash);
 126                 return NT_STATUS_NO_MEMORY;
 127         }
 128         return NT_STATUS_OK;
 129 }
 130
 131 /**
 132  * Converts a password to the hashes on an NTLMSSP context.
 133  *
 134  */
 135 NTSTATUS ntlmssp_set_password(struct ntlmssp_state *ntlmssp_state, const char *password)
 136 {
 137         if (!password) {
 138                 ntlmssp_state->lm_hash = NULL;
 139                 ntlmssp_state->nt_hash = NULL;
 140         } else {
 141                 uint8_t lm_hash[16];
 142                 uint8_t nt_hash[16];
 143
 144                 E_deshash(password, lm_hash);
 145                 E_md4hash(password, nt_hash);
 146                 return ntlmssp_set_hashes(ntlmssp_state, lm_hash, nt_hash);
 147         }
 148         return NT_STATUS_OK;
 149 }
 150
 151 /**
 152  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
 153  *
 154  */
 155 NTSTATUS ntlmssp_set_domain(struct ntlmssp_state *ntlmssp_state, const char *domain)
 156 {
 157         ntlmssp_state->domain = talloc_strdup(ntlmssp_state,
 158                                               domain ? domain : "" );
 159         if (!ntlmssp_state->domain) {
 160                 return NT_STATUS_NO_MEMORY;
 161         }
 162         return NT_STATUS_OK;
 163 }
 164
 165 /**
 166  * Request features for the NTLMSSP negotiation
 167  *
 168  * @param ntlmssp_state NTLMSSP state
 169  * @param feature_list List of space seperated features requested from NTLMSSP.
 170  */
 171 void ntlmssp_want_feature_list(struct ntlmssp_state *ntlmssp_state, char *feature_list)
 172 {
 173         /*
 174          * We need to set this to allow a later SetPassword
 175          * via the SAMR pipe to succeed. Strange.... We could
 176          * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
 177          */
 178         if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, True)) {
 179                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 180         }
 181         if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, True)) {
 182                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 183         }
 184         if(in_list("NTLMSSP_FEATURE_SEAL", feature_list, True)) {
 185                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 186         }
 187         if (in_list("NTLMSSP_FEATURE_CCACHE", feature_list, true)) {
 188                 ntlmssp_state->use_ccache = true;
 189         }
 190 }
 191
 192 /**
 193  * Request a feature for the NTLMSSP negotiation
 194  *
 195  * @param ntlmssp_state NTLMSSP state
 196  * @param feature Bit flag specifying the requested feature
 197  */
 198 void ntlmssp_want_feature(struct ntlmssp_state *ntlmssp_state, uint32_t feature)
 199 {
 200         /* As per JRA's comment above */
 201         if (feature & NTLMSSP_FEATURE_SESSION_KEY) {
 202                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 203         }
 204         if (feature & NTLMSSP_FEATURE_SIGN) {
 205                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 206         }
 207         if (feature & NTLMSSP_FEATURE_SEAL) {
 208                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 209                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 210         }
 211         if (feature & NTLMSSP_FEATURE_CCACHE) {
 212                 ntlmssp_state->use_ccache = true;
 213         }
 214 }
 215
 216 /**
 217  * Next state function for the NTLMSSP state machine
 218  *
 219  * @param ntlmssp_state NTLMSSP State
 220  * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
 221  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 222  * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
 223  */
 224
 225 NTSTATUS ntlmssp_update(struct ntlmssp_state *ntlmssp_state,
 226                         const DATA_BLOB input, DATA_BLOB *out)
 227 {
 228         uint32_t ntlmssp_command;
 229         int i;
 230
 231         if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
 232                 /* Called update after negotiations finished. */
 233                 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
 234                 return NT_STATUS_INVALID_PARAMETER;
 235         }
 236
 237         *out = data_blob_null;
 238
 239         if (!input.length) {
 240                 switch (ntlmssp_state->role) {
 241                 case NTLMSSP_CLIENT:
 242                         ntlmssp_command = NTLMSSP_INITIAL;
 243                         break;
 244                 case NTLMSSP_SERVER:
 245                         /* 'datagram' mode - no neg packet */
 246                         ntlmssp_command = NTLMSSP_NEGOTIATE;
 247                         break;
 248                 default:
 249                         DEBUG(1, ("Invalid role: %d\n", ntlmssp_state->role));
 250                         return NT_STATUS_INVALID_PARAMETER;
 251                 }
 252         } else {
 253                 if (!msrpc_parse(ntlmssp_state, &input, "Cd",
 254                                  "NTLMSSP",
 255                                  &ntlmssp_command)) {
 256                         DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
 257                         dump_data(2, input.data, input.length);
 258                         return NT_STATUS_INVALID_PARAMETER;
 259                 }
 260         }
 261
 262         if (ntlmssp_command != ntlmssp_state->expected_state) {
 263                 DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
 264                 return NT_STATUS_INVALID_PARAMETER;
 265         }
 266
 267         for (i=0; ntlmssp_callbacks[i].fn; i++) {
 268                 if (ntlmssp_callbacks[i].role == ntlmssp_state->role
 269                     && ntlmssp_callbacks[i].ntlmssp_command == ntlmssp_command) {
 270                         return ntlmssp_callbacks[i].fn(ntlmssp_state, ntlmssp_state, input, out);
 271                 }
 272         }
 273
 274         DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
 275                   ntlmssp_state->role, ntlmssp_command));
 276
 277         return NT_STATUS_INVALID_PARAMETER;
 278 }
 279
 280 /**
 281  * Create an NTLMSSP state machine
 282  *
 283  * @param ntlmssp_state NTLMSSP State, allocated by this function
 284  */
 285
 286 NTSTATUS ntlmssp_server_start(TALLOC_CTX *mem_ctx,
 287                               bool is_standalone,
 288                               const char *netbios_name,
 289                               const char *netbios_domain,
 290                               const char *dns_name,
 291                               const char *dns_domain,
 292                               struct ntlmssp_state **_ntlmssp_state)
 293 {
 294         struct ntlmssp_state *ntlmssp_state;
 295
 296         if (!netbios_name) {
 297                 netbios_name = "";
 298         }
 299
 300         if (!netbios_domain) {
 301                 netbios_domain = "";
 302         }
 303
 304         if (!dns_domain) {
 305                 dns_domain = "";
 306         }
 307
 308         if (!dns_name) {
 309                 dns_name = "";
 310         }
 311
 312         ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
 313         if (!ntlmssp_state) {
 314                 return NT_STATUS_NO_MEMORY;
 315         }
 316
 317         ntlmssp_state->role = NTLMSSP_SERVER;
 318
 319         ntlmssp_state->get_challenge = get_challenge;
 320         ntlmssp_state->set_challenge = set_challenge;
 321         ntlmssp_state->may_set_challenge = may_set_challenge;
 322
 323         ntlmssp_state->server.is_standalone = is_standalone;
 324
 325         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 326
 327         ntlmssp_state->allow_lm_key = lp_lanman_auth();
 328
 329         ntlmssp_state->neg_flags =
 330                 NTLMSSP_NEGOTIATE_128 |
 331                 NTLMSSP_NEGOTIATE_56 |
 332                 NTLMSSP_NEGOTIATE_VERSION |
 333                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
 334                 NTLMSSP_NEGOTIATE_NTLM |
 335                 NTLMSSP_NEGOTIATE_NTLM2 |
 336                 NTLMSSP_NEGOTIATE_KEY_EXCH;
 337
 338         ntlmssp_state->server.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
 339         if (!ntlmssp_state->server.netbios_name) {
 340                 talloc_free(ntlmssp_state);
 341                 return NT_STATUS_NO_MEMORY;
 342         }
 343         ntlmssp_state->server.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
 344         if (!ntlmssp_state->server.netbios_domain) {
 345                 talloc_free(ntlmssp_state);
 346                 return NT_STATUS_NO_MEMORY;
 347         }
 348         ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state, dns_name);
 349         if (!ntlmssp_state->server.dns_name) {
 350                 talloc_free(ntlmssp_state);
 351                 return NT_STATUS_NO_MEMORY;
 352         }
 353         ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state, dns_domain);
 354         if (!ntlmssp_state->server.dns_domain) {
 355                 talloc_free(ntlmssp_state);
 356                 return NT_STATUS_NO_MEMORY;
 357         }
 358
 359         *_ntlmssp_state = ntlmssp_state;
 360         return NT_STATUS_OK;
 361 }
 362
 363 /*********************************************************************
 364  Client side NTLMSSP
 365 *********************************************************************/
 366
 367 /**
 368  * Next state function for the Initial packet
 369  *
 370  * @param ntlmssp_state NTLMSSP State
 371  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 372  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 373  * @return Errors or NT_STATUS_OK.
 374  */
 375
 376 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
 377                                        TALLOC_CTX *out_mem_ctx,
 378                                        DATA_BLOB in, DATA_BLOB *out)
 379 {
 380         const char *domain = ntlmssp_state->client.netbios_domain;
 381         const char *workstation = ntlmssp_state->client.netbios_name;
 382         NTSTATUS status;
 383
 384         /* These don't really matter in the initial packet, so don't panic if they are not set */
 385         if (!domain) {
 386                 domain = "";
 387         }
 388
 389         if (!workstation) {
 390                 workstation = "";
 391         }
 392
 393         if (ntlmssp_state->unicode) {
 394                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 395         } else {
 396                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 397         }
 398
 399         if (ntlmssp_state->use_ntlmv2) {
 400                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 401         }
 402
 403         /* generate the ntlmssp negotiate packet */
 404         status = msrpc_gen(out_mem_ctx,
 405                   out, "CddAA",
 406                   "NTLMSSP",
 407                   NTLMSSP_NEGOTIATE,
 408                   ntlmssp_state->neg_flags,
 409                   domain,
 410                   workstation);
 411
 412         if (!NT_STATUS_IS_OK(status)) {
 413                 DEBUG(0, ("ntlmssp_client_initial: failed to generate "
 414                           "ntlmssp negotiate packet\n"));
 415                 return status;
 416         }
 417
 418         if (DEBUGLEVEL >= 10) {
 419                 struct NEGOTIATE_MESSAGE *negotiate = talloc(
 420                         talloc_tos(), struct NEGOTIATE_MESSAGE);
 421                 if (negotiate != NULL) {
 422                         status = ntlmssp_pull_NEGOTIATE_MESSAGE(
 423                                 out, negotiate, negotiate);
 424                         if (NT_STATUS_IS_OK(status)) {
 425                                 NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
 426                                                 negotiate);
 427                         }
 428                         TALLOC_FREE(negotiate);
 429                 }
 430         }
 431
 432         ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
 433
 434         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 435 }
 436
 437 /**
 438  * Next state function for the Challenge Packet.  Generate an auth packet.
 439  *
 440  * @param ntlmssp_state NTLMSSP State
 441  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 442  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 443  * @return Errors or NT_STATUS_OK.
 444  */
 445
 446 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
 447                                          TALLOC_CTX *out_mem_ctx, /* Unused at this time */
 448                                          const DATA_BLOB reply, DATA_BLOB *next_request)
 449 {
 450         uint32_t chal_flags, ntlmssp_command, unkn1, unkn2;
 451         DATA_BLOB server_domain_blob;
 452         DATA_BLOB challenge_blob;
 453         DATA_BLOB struct_blob = data_blob_null;
 454         char *server_domain;
 455         const char *chal_parse_string;
 456         const char *auth_gen_string;
 457         DATA_BLOB lm_response = data_blob_null;
 458         DATA_BLOB nt_response = data_blob_null;
 459         DATA_BLOB session_key = data_blob_null;
 460         DATA_BLOB encrypted_session_key = data_blob_null;
 461         NTSTATUS nt_status = NT_STATUS_OK;
 462
 463         if (ntlmssp_state->use_ccache) {
 464                 struct wbcCredentialCacheParams params;
 465                 struct wbcCredentialCacheInfo *info = NULL;
 466                 struct wbcAuthErrorInfo *error = NULL;
 467                 struct wbcNamedBlob auth_blob;
 468                 struct wbcBlob *wbc_next = NULL;
 469                 struct wbcBlob *wbc_session_key = NULL;
 470                 wbcErr wbc_status;
 471                 int i;
 472
 473                 params.account_name = ntlmssp_state->user;
 474                 params.domain_name = ntlmssp_state->domain;
 475                 params.level = WBC_CREDENTIAL_CACHE_LEVEL_NTLMSSP;
 476
 477                 auth_blob.name = "challenge_blob";
 478                 auth_blob.flags = 0;
 479                 auth_blob.blob.data = reply.data;
 480                 auth_blob.blob.length = reply.length;
 481                 params.num_blobs = 1;
 482                 params.blobs = &auth_blob;
 483
 484                 wbc_status = wbcCredentialCache(&params, &info, &error);
 485                 wbcFreeMemory(error);
 486                 if (!WBC_ERROR_IS_OK(wbc_status)) {
 487                         goto noccache;
 488                 }
 489
 490                 for (i=0; i<info->num_blobs; i++) {
 491                         if (strequal(info->blobs[i].name, "auth_blob")) {
 492                                 wbc_next = &info->blobs[i].blob;
 493                         }
 494                         if (strequal(info->blobs[i].name, "session_key")) {
 495                                 wbc_session_key = &info->blobs[i].blob;
 496                         }
 497                 }
 498                 if ((wbc_next == NULL) || (wbc_session_key == NULL)) {
 499                         wbcFreeMemory(info);
 500                         goto noccache;
 501                 }
 502
 503                 *next_request = data_blob(wbc_next->data, wbc_next->length);
 504                 ntlmssp_state->session_key = data_blob(
 505                         wbc_session_key->data, wbc_session_key->length);
 506
 507                 wbcFreeMemory(info);
 508                 goto done;
 509         }
 510
 511 noccache:
 512
 513         if (!msrpc_parse(ntlmssp_state, &reply, "CdBd",
 514                          "NTLMSSP",
 515                          &ntlmssp_command,
 516                          &server_domain_blob,
 517                          &chal_flags)) {
 518                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
 519                 dump_data(2, reply.data, reply.length);
 520
 521                 return NT_STATUS_INVALID_PARAMETER;
 522         }
 523
 524         if (DEBUGLEVEL >= 10) {
 525                 struct CHALLENGE_MESSAGE *challenge = talloc(
 526                         talloc_tos(), struct CHALLENGE_MESSAGE);
 527                 if (challenge != NULL) {
 528                         NTSTATUS status;
 529                         challenge->NegotiateFlags = chal_flags;
 530                         status = ntlmssp_pull_CHALLENGE_MESSAGE(
 531                                 &reply, challenge, challenge);
 532                         if (NT_STATUS_IS_OK(status)) {
 533                                 NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
 534                                                 challenge);
 535                         }
 536                         TALLOC_FREE(challenge);
 537                 }
 538         }
 539
 540         data_blob_free(&server_domain_blob);
 541
 542         DEBUG(3, ("Got challenge flags:\n"));
 543         debug_ntlmssp_flags(chal_flags);
 544
 545         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
 546
 547         if (ntlmssp_state->unicode) {
 548                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
 549                         chal_parse_string = "CdUdbddB";
 550                 } else {
 551                         chal_parse_string = "CdUdbdd";
 552                 }
 553                 auth_gen_string = "CdBBUUUBd";
 554         } else {
 555                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
 556                         chal_parse_string = "CdAdbddB";
 557                 } else {
 558                         chal_parse_string = "CdAdbdd";
 559                 }
 560
 561                 auth_gen_string = "CdBBAAABd";
 562         }
 563
 564         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
 565         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
 566
 567         if (!msrpc_parse(ntlmssp_state, &reply, chal_parse_string,
 568                          "NTLMSSP",
 569                          &ntlmssp_command,
 570                          &server_domain,
 571                          &chal_flags,
 572                          &challenge_blob, 8,
 573                          &unkn1, &unkn2,
 574                          &struct_blob)) {
 575                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
 576                 dump_data(2, reply.data, reply.length);
 577                 return NT_STATUS_INVALID_PARAMETER;
 578         }
 579
 580         if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
 581                 ntlmssp_state->server.is_standalone = true;
 582         } else {
 583                 ntlmssp_state->server.is_standalone = false;
 584         }
 585         /* TODO: parse struct_blob and fill in the rest */
 586         ntlmssp_state->server.netbios_name = "";
 587         ntlmssp_state->server.netbios_domain = server_domain;
 588         ntlmssp_state->server.dns_name = "";
 589         ntlmssp_state->server.dns_domain = "";
 590
 591         if (challenge_blob.length != 8) {
 592                 data_blob_free(&struct_blob);
 593                 return NT_STATUS_INVALID_PARAMETER;
 594         }
 595
 596         if (!ntlmssp_state->nt_hash || !ntlmssp_state->lm_hash) {
 597                 static const uint8_t zeros[16] = {0, };
 598                 /* do nothing - blobs are zero length */
 599
 600                 /* session key is all zeros */
 601                 session_key = data_blob_talloc(ntlmssp_state, zeros, 16);
 602
 603                 /* not doing NLTM2 without a password */
 604                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 605         } else if (ntlmssp_state->use_ntlmv2) {
 606                 if (!struct_blob.length) {
 607                         /* be lazy, match win2k - we can't do NTLMv2 without it */
 608                         DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
 609                         return NT_STATUS_INVALID_PARAMETER;
 610                 }
 611
 612                 /* TODO: if the remote server is standalone, then we should replace 'domain'
 613                    with the server name as supplied above */
 614
 615                 if (!SMBNTLMv2encrypt_hash(ntlmssp_state,
 616                                            ntlmssp_state->user,
 617                                            ntlmssp_state->domain,
 618                                            ntlmssp_state->nt_hash, &challenge_blob,
 619                                            &struct_blob,
 620                                            &lm_response, &nt_response, NULL,
 621                                            &session_key)) {
 622                         data_blob_free(&challenge_blob);
 623                         data_blob_free(&struct_blob);
 624                         return NT_STATUS_NO_MEMORY;
 625                 }
 626         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 627                 struct MD5Context md5_session_nonce_ctx;
 628                 uint8_t session_nonce[16];
 629                 uint8_t session_nonce_hash[16];
 630                 uint8_t user_session_key[16];
 631
 632                 lm_response = data_blob_talloc(ntlmssp_state, NULL, 24);
 633                 generate_random_buffer(lm_response.data, 8);
 634                 memset(lm_response.data+8, 0, 16);
 635
 636                 memcpy(session_nonce, challenge_blob.data, 8);
 637                 memcpy(&session_nonce[8], lm_response.data, 8);
 638
 639                 MD5Init(&md5_session_nonce_ctx);
 640                 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
 641                 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
 642                 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 643
 644                 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
 645                 DEBUG(5, ("challenge is: \n"));
 646                 dump_data(5, session_nonce_hash, 8);
 647
 648                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
 649                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,
 650                                   session_nonce_hash,
 651                                   nt_response.data);
 652
 653                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 654
 655                 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, user_session_key);
 656                 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
 657                 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 658         } else {
 659                 /* lanman auth is insecure, it may be disabled */
 660                 if (lp_client_lanman_auth()) {
 661                         lm_response = data_blob_talloc(ntlmssp_state,
 662                                                        NULL, 24);
 663                         SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
 664                                    lm_response.data);
 665                 }
 666
 667                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
 668                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
 669                              nt_response.data);
 670
 671                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 672                 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 673                     && lp_client_lanman_auth()) {
 674                         SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
 675                                         session_key.data);
 676                         dump_data_pw("LM session key\n", session_key.data, session_key.length);
 677                 } else {
 678                         SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, session_key.data);
 679                         dump_data_pw("NT session key:\n", session_key.data, session_key.length);
 680                 }
 681         }
 682         data_blob_free(&struct_blob);
 683
 684         /* Key exchange encryptes a new client-generated session key with
 685            the password-derived key */
 686         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 687                 /* Make up a new session key */
 688                 uint8_t client_session_key[16];
 689                 generate_random_buffer(client_session_key, sizeof(client_session_key));
 690
 691                 /* Encrypt the new session key with the old one */
 692                 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
 693                 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
 694                 arcfour_crypt_blob(encrypted_session_key.data, encrypted_session_key.length, &session_key);
 695                 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
 696
 697                 /* Mark the new session key as the 'real' session key */
 698                 data_blob_free(&session_key);
 699                 session_key = data_blob_talloc(ntlmssp_state,
 700                                                client_session_key,
 701                                                sizeof(client_session_key));
 702         }
 703
 704         /* this generates the actual auth packet */
 705         nt_status = msrpc_gen(ntlmssp_state, next_request, auth_gen_string,
 706                        "NTLMSSP",
 707                        NTLMSSP_AUTH,
 708                        lm_response.data, lm_response.length,
 709                        nt_response.data, nt_response.length,
 710                        ntlmssp_state->domain,
 711                        ntlmssp_state->user,
 712                        ntlmssp_state->client.netbios_name,
 713                        encrypted_session_key.data, encrypted_session_key.length,
 714                        ntlmssp_state->neg_flags);
 715
 716         if (!NT_STATUS_IS_OK(nt_status)) {
 717                 return NT_STATUS_NO_MEMORY;
 718         }
 719
 720         if (DEBUGLEVEL >= 10) {
 721                 struct AUTHENTICATE_MESSAGE *authenticate = talloc(
 722                         talloc_tos(), struct AUTHENTICATE_MESSAGE);
 723                 if (authenticate != NULL) {
 724                         NTSTATUS status;
 725                         authenticate->NegotiateFlags =
 726                                 ntlmssp_state->neg_flags;
 727                         status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
 728                                 next_request, authenticate, authenticate);
 729                         if (NT_STATUS_IS_OK(status)) {
 730                                 NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
 731                                                 authenticate);
 732                         }
 733                         TALLOC_FREE(authenticate);
 734                 }
 735         }
 736
 737         data_blob_free(&encrypted_session_key);
 738
 739         data_blob_free(&ntlmssp_state->chal);
 740
 741         ntlmssp_state->session_key = session_key;
 742
 743         ntlmssp_state->chal = challenge_blob;
 744         ntlmssp_state->lm_resp = lm_response;
 745         ntlmssp_state->nt_resp = nt_response;
 746
 747 done:
 748
 749         ntlmssp_state->expected_state = NTLMSSP_DONE;
 750
 751         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
 752                 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
 753         }
 754
 755         return nt_status;
 756 }
 757
 758 NTSTATUS ntlmssp_client_start(TALLOC_CTX *mem_ctx,
 759                               const char *netbios_name,
 760                               const char *netbios_domain,
 761                               bool use_ntlmv2,
 762                               struct ntlmssp_state **_ntlmssp_state)
 763 {
 764         struct ntlmssp_state *ntlmssp_state;
 765
 766         if (!netbios_name) {
 767                 netbios_name = "";
 768         }
 769
 770         if (!netbios_domain) {
 771                 netbios_domain = "";
 772         }
 773
 774         ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
 775         if (!ntlmssp_state) {
 776                 return NT_STATUS_NO_MEMORY;
 777         }
 778
 779         ntlmssp_state->role = NTLMSSP_CLIENT;
 780
 781         ntlmssp_state->unicode = True;
 782
 783         ntlmssp_state->use_ntlmv2 = use_ntlmv2;
 784
 785         ntlmssp_state->expected_state = NTLMSSP_INITIAL;
 786
 787         ntlmssp_state->neg_flags =
 788                 NTLMSSP_NEGOTIATE_128 |
 789                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
 790                 NTLMSSP_NEGOTIATE_NTLM |
 791                 NTLMSSP_NEGOTIATE_NTLM2 |
 792                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 793                 NTLMSSP_REQUEST_TARGET;
 794
 795         ntlmssp_state->client.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
 796         if (!ntlmssp_state->client.netbios_name) {
 797                 talloc_free(ntlmssp_state);
 798                 return NT_STATUS_NO_MEMORY;
 799         }
 800         ntlmssp_state->client.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
 801         if (!ntlmssp_state->client.netbios_domain) {
 802                 talloc_free(ntlmssp_state);
 803                 return NT_STATUS_NO_MEMORY;
 804         }
 805
 806         *_ntlmssp_state = ntlmssp_state;
 807         return NT_STATUS_OK;
 808 }