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