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                 wbcFreeMemory(error);
 467                 if (!WBC_ERROR_IS_OK(wbc_status)) {
 468                         goto noccache;
 469                 }
 470
 471                 for (i=0; i<info->num_blobs; i++) {
 472                         if (strequal(info->blobs[i].name, "auth_blob")) {
 473                                 wbc_next = &info->blobs[i].blob;
 474                         }
 475                         if (strequal(info->blobs[i].name, "session_key")) {
 476                                 wbc_session_key = &info->blobs[i].blob;
 477                         }
 478                 }
 479                 if ((wbc_next == NULL) || (wbc_session_key == NULL)) {
 480                         wbcFreeMemory(info);
 481                         goto noccache;
 482                 }
 483
 484                 *next_request = data_blob(wbc_next->data, wbc_next->length);
 485                 ntlmssp_state->session_key = data_blob(
 486                         wbc_session_key->data, wbc_session_key->length);
 487
 488                 wbcFreeMemory(info);
 489                 goto done;
 490         }
 491
 492 noccache:
 493
 494         if (!msrpc_parse(ntlmssp_state, &reply, "CdBd",
 495                          "NTLMSSP",
 496                          &ntlmssp_command,
 497                          &server_domain_blob,
 498                          &chal_flags)) {
 499                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
 500                 dump_data(2, reply.data, reply.length);
 501
 502                 return NT_STATUS_INVALID_PARAMETER;
 503         }
 504
 505         if (DEBUGLEVEL >= 10) {
 506                 struct CHALLENGE_MESSAGE *challenge = talloc(
 507                         talloc_tos(), struct CHALLENGE_MESSAGE);
 508                 if (challenge != NULL) {
 509                         NTSTATUS status;
 510                         challenge->NegotiateFlags = chal_flags;
 511                         status = ntlmssp_pull_CHALLENGE_MESSAGE(
 512                                 &reply, challenge, challenge);
 513                         if (NT_STATUS_IS_OK(status)) {
 514                                 NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
 515                                                 challenge);
 516                         }
 517                         TALLOC_FREE(challenge);
 518                 }
 519         }
 520
 521         data_blob_free(&server_domain_blob);
 522
 523         DEBUG(3, ("Got challenge flags:\n"));
 524         debug_ntlmssp_flags(chal_flags);
 525
 526         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
 527
 528         if (ntlmssp_state->unicode) {
 529                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
 530                         chal_parse_string = "CdUdbddB";
 531                 } else {
 532                         chal_parse_string = "CdUdbdd";
 533                 }
 534                 auth_gen_string = "CdBBUUUBd";
 535         } else {
 536                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
 537                         chal_parse_string = "CdAdbddB";
 538                 } else {
 539                         chal_parse_string = "CdAdbdd";
 540                 }
 541
 542                 auth_gen_string = "CdBBAAABd";
 543         }
 544
 545         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
 546         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
 547
 548         if (!msrpc_parse(ntlmssp_state, &reply, chal_parse_string,
 549                          "NTLMSSP",
 550                          &ntlmssp_command,
 551                          &server_domain,
 552                          &chal_flags,
 553                          &challenge_blob, 8,
 554                          &unkn1, &unkn2,
 555                          &struct_blob)) {
 556                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
 557                 dump_data(2, reply.data, reply.length);
 558                 return NT_STATUS_INVALID_PARAMETER;
 559         }
 560
 561         if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
 562                 ntlmssp_state->server.is_standalone = true;
 563         } else {
 564                 ntlmssp_state->server.is_standalone = false;
 565         }
 566         /* TODO: parse struct_blob and fill in the rest */
 567         ntlmssp_state->server.netbios_name = "";
 568         ntlmssp_state->server.netbios_domain = server_domain;
 569         ntlmssp_state->server.dns_name = "";
 570         ntlmssp_state->server.dns_domain = "";
 571
 572         if (challenge_blob.length != 8) {
 573                 data_blob_free(&struct_blob);
 574                 return NT_STATUS_INVALID_PARAMETER;
 575         }
 576
 577         if (!ntlmssp_state->nt_hash || !ntlmssp_state->lm_hash) {
 578                 static const uint8_t zeros[16] = {0, };
 579                 /* do nothing - blobs are zero length */
 580
 581                 /* session key is all zeros */
 582                 session_key = data_blob_talloc(ntlmssp_state, zeros, 16);
 583
 584                 /* not doing NLTM2 without a password */
 585                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 586         } else if (ntlmssp_state->use_ntlmv2) {
 587                 if (!struct_blob.length) {
 588                         /* be lazy, match win2k - we can't do NTLMv2 without it */
 589                         DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
 590                         return NT_STATUS_INVALID_PARAMETER;
 591                 }
 592
 593                 /* TODO: if the remote server is standalone, then we should replace 'domain'
 594                    with the server name as supplied above */
 595
 596                 if (!SMBNTLMv2encrypt_hash(ntlmssp_state,
 597                                            ntlmssp_state->user,
 598                                            ntlmssp_state->domain,
 599                                            ntlmssp_state->nt_hash, &challenge_blob,
 600                                            &struct_blob,
 601                                            &lm_response, &nt_response, NULL,
 602                                            &session_key)) {
 603                         data_blob_free(&challenge_blob);
 604                         data_blob_free(&struct_blob);
 605                         return NT_STATUS_NO_MEMORY;
 606                 }
 607         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 608                 struct MD5Context md5_session_nonce_ctx;
 609                 uint8_t session_nonce[16];
 610                 uint8_t session_nonce_hash[16];
 611                 uint8_t user_session_key[16];
 612
 613                 lm_response = data_blob_talloc(ntlmssp_state, NULL, 24);
 614                 generate_random_buffer(lm_response.data, 8);
 615                 memset(lm_response.data+8, 0, 16);
 616
 617                 memcpy(session_nonce, challenge_blob.data, 8);
 618                 memcpy(&session_nonce[8], lm_response.data, 8);
 619
 620                 MD5Init(&md5_session_nonce_ctx);
 621                 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
 622                 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
 623                 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 624
 625                 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
 626                 DEBUG(5, ("challenge is: \n"));
 627                 dump_data(5, session_nonce_hash, 8);
 628
 629                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
 630                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,
 631                                   session_nonce_hash,
 632                                   nt_response.data);
 633
 634                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 635
 636                 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, user_session_key);
 637                 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
 638                 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 639         } else {
 640                 /* lanman auth is insecure, it may be disabled */
 641                 if (lp_client_lanman_auth()) {
 642                         lm_response = data_blob_talloc(ntlmssp_state,
 643                                                        NULL, 24);
 644                         SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
 645                                    lm_response.data);
 646                 }
 647
 648                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
 649                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
 650                              nt_response.data);
 651
 652                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 653                 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 654                     && lp_client_lanman_auth()) {
 655                         SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
 656                                         session_key.data);
 657                         dump_data_pw("LM session key\n", session_key.data, session_key.length);
 658                 } else {
 659                         SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, session_key.data);
 660                         dump_data_pw("NT session key:\n", session_key.data, session_key.length);
 661                 }
 662         }
 663         data_blob_free(&struct_blob);
 664
 665         /* Key exchange encryptes a new client-generated session key with
 666            the password-derived key */
 667         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 668                 /* Make up a new session key */
 669                 uint8_t client_session_key[16];
 670                 generate_random_buffer(client_session_key, sizeof(client_session_key));
 671
 672                 /* Encrypt the new session key with the old one */
 673                 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
 674                 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
 675                 arcfour_crypt_blob(encrypted_session_key.data, encrypted_session_key.length, &session_key);
 676                 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
 677
 678                 /* Mark the new session key as the 'real' session key */
 679                 data_blob_free(&session_key);
 680                 session_key = data_blob_talloc(ntlmssp_state,
 681                                                client_session_key,
 682                                                sizeof(client_session_key));
 683         }
 684
 685         /* this generates the actual auth packet */
 686         if (!msrpc_gen(ntlmssp_state, next_request, auth_gen_string,
 687                        "NTLMSSP",
 688                        NTLMSSP_AUTH,
 689                        lm_response.data, lm_response.length,
 690                        nt_response.data, nt_response.length,
 691                        ntlmssp_state->domain,
 692                        ntlmssp_state->user,
 693                        ntlmssp_state->client.netbios_name,
 694                        encrypted_session_key.data, encrypted_session_key.length,
 695                        ntlmssp_state->neg_flags)) {
 696
 697                 return NT_STATUS_NO_MEMORY;
 698         }
 699
 700         if (DEBUGLEVEL >= 10) {
 701                 struct AUTHENTICATE_MESSAGE *authenticate = talloc(
 702                         talloc_tos(), struct AUTHENTICATE_MESSAGE);
 703                 if (authenticate != NULL) {
 704                         NTSTATUS status;
 705                         authenticate->NegotiateFlags =
 706                                 ntlmssp_state->neg_flags;
 707                         status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
 708                                 next_request, authenticate, authenticate);
 709                         if (NT_STATUS_IS_OK(status)) {
 710                                 NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
 711                                                 authenticate);
 712                         }
 713                         TALLOC_FREE(authenticate);
 714                 }
 715         }
 716
 717         data_blob_free(&encrypted_session_key);
 718
 719         data_blob_free(&ntlmssp_state->chal);
 720
 721         ntlmssp_state->session_key = session_key;
 722
 723         ntlmssp_state->chal = challenge_blob;
 724         ntlmssp_state->lm_resp = lm_response;
 725         ntlmssp_state->nt_resp = nt_response;
 726
 727 done:
 728
 729         ntlmssp_state->expected_state = NTLMSSP_DONE;
 730
 731         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
 732                 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
 733         }
 734
 735         return nt_status;
 736 }
 737
 738 NTSTATUS ntlmssp_client_start(TALLOC_CTX *mem_ctx,
 739                               const char *netbios_name,
 740                               const char *netbios_domain,
 741                               bool use_ntlmv2,
 742                               struct ntlmssp_state **_ntlmssp_state)
 743 {
 744         struct ntlmssp_state *ntlmssp_state;
 745
 746         if (!netbios_name) {
 747                 netbios_name = "";
 748         }
 749
 750         if (!netbios_domain) {
 751                 netbios_domain = "";
 752         }
 753
 754         ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
 755         if (!ntlmssp_state) {
 756                 return NT_STATUS_NO_MEMORY;
 757         }
 758
 759         ntlmssp_state->role = NTLMSSP_CLIENT;
 760
 761         ntlmssp_state->unicode = True;
 762
 763         ntlmssp_state->use_ntlmv2 = use_ntlmv2;
 764
 765         ntlmssp_state->expected_state = NTLMSSP_INITIAL;
 766
 767         ntlmssp_state->neg_flags =
 768                 NTLMSSP_NEGOTIATE_128 |
 769                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
 770                 NTLMSSP_NEGOTIATE_NTLM |
 771                 NTLMSSP_NEGOTIATE_NTLM2 |
 772                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 773                 NTLMSSP_REQUEST_TARGET;
 774
 775         ntlmssp_state->client.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
 776         if (!ntlmssp_state->client.netbios_name) {
 777                 talloc_free(ntlmssp_state);
 778                 return NT_STATUS_NO_MEMORY;
 779         }
 780         ntlmssp_state->client.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
 781         if (!ntlmssp_state->client.netbios_domain) {
 782                 talloc_free(ntlmssp_state);
 783                 return NT_STATUS_NO_MEMORY;
 784         }
 785
 786         *_ntlmssp_state = ntlmssp_state;
 787         return NT_STATUS_OK;
 788 }