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 #include "../nsswitch/libwbclient/wbclient.h"
  34
  35 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
  36                                        TALLOC_CTX *out_mem_ctx, /* Unused at this time */
  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_SEAL;
 209         }
 210         if (feature & NTLMSSP_FEATURE_CCACHE) {
 211                 ntlmssp_state->use_ccache = true;
 212         }
 213 }
 214
 215 /**
 216  * Next state function for the NTLMSSP state machine
 217  *
 218  * @param ntlmssp_state NTLMSSP State
 219  * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
 220  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 221  * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
 222  */
 223
 224 NTSTATUS ntlmssp_update(struct ntlmssp_state *ntlmssp_state,
 225                         const DATA_BLOB input, DATA_BLOB *out)
 226 {
 227         uint32_t ntlmssp_command;
 228         int i;
 229
 230         if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
 231                 /* Called update after negotiations finished. */
 232                 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
 233                 return NT_STATUS_INVALID_PARAMETER;
 234         }
 235
 236         *out = data_blob_null;
 237
 238         if (!input.length) {
 239                 switch (ntlmssp_state->role) {
 240                 case NTLMSSP_CLIENT:
 241                         ntlmssp_command = NTLMSSP_INITIAL;
 242                         break;
 243                 case NTLMSSP_SERVER:
 244                         /* 'datagram' mode - no neg packet */
 245                         ntlmssp_command = NTLMSSP_NEGOTIATE;
 246                         break;
 247                 default:
 248                         DEBUG(1, ("Invalid role: %d\n", ntlmssp_state->role));
 249                         return NT_STATUS_INVALID_PARAMETER;
 250                 }
 251         } else {
 252                 if (!msrpc_parse(ntlmssp_state, &input, "Cd",
 253                                  "NTLMSSP",
 254                                  &ntlmssp_command)) {
 255                         DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
 256                         dump_data(2, input.data, input.length);
 257                         return NT_STATUS_INVALID_PARAMETER;
 258                 }
 259         }
 260
 261         if (ntlmssp_command != ntlmssp_state->expected_state) {
 262                 DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
 263                 return NT_STATUS_INVALID_PARAMETER;
 264         }
 265
 266         for (i=0; ntlmssp_callbacks[i].fn; i++) {
 267                 if (ntlmssp_callbacks[i].role == ntlmssp_state->role
 268                     && ntlmssp_callbacks[i].ntlmssp_command == ntlmssp_command) {
 269                         return ntlmssp_callbacks[i].fn(ntlmssp_state, ntlmssp_state, input, out);
 270                 }
 271         }
 272
 273         DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
 274                   ntlmssp_state->role, ntlmssp_command));
 275
 276         return NT_STATUS_INVALID_PARAMETER;
 277 }
 278
 279 /**
 280  * Create an NTLMSSP state machine
 281  *
 282  * @param ntlmssp_state NTLMSSP State, allocated by this function
 283  */
 284
 285 NTSTATUS ntlmssp_server_start(TALLOC_CTX *mem_ctx,
 286                               bool is_standalone,
 287                               const char *netbios_name,
 288                               const char *netbios_domain,
 289                               const char *dns_name,
 290                               const char *dns_domain,
 291                               struct ntlmssp_state **_ntlmssp_state)
 292 {
 293         struct ntlmssp_state *ntlmssp_state;
 294
 295         if (!netbios_name) {
 296                 netbios_name = "";
 297         }
 298
 299         if (!netbios_domain) {
 300                 netbios_domain = "";
 301         }
 302
 303         if (!dns_domain) {
 304                 dns_domain = "";
 305         }
 306
 307         if (!dns_name) {
 308                 dns_name = "";
 309         }
 310
 311         ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
 312         if (!ntlmssp_state) {
 313                 return NT_STATUS_NO_MEMORY;
 314         }
 315
 316         ntlmssp_state->role = NTLMSSP_SERVER;
 317
 318         ntlmssp_state->get_challenge = get_challenge;
 319         ntlmssp_state->set_challenge = set_challenge;
 320         ntlmssp_state->may_set_challenge = may_set_challenge;
 321
 322         ntlmssp_state->server.is_standalone = is_standalone;
 323
 324         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 325
 326         ntlmssp_state->allow_lm_key = lp_lanman_auth();
 327
 328         ntlmssp_state->neg_flags =
 329                 NTLMSSP_NEGOTIATE_128 |
 330                 NTLMSSP_NEGOTIATE_56 |
 331                 NTLMSSP_NEGOTIATE_VERSION |
 332                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
 333                 NTLMSSP_NEGOTIATE_NTLM |
 334                 NTLMSSP_NEGOTIATE_NTLM2 |
 335                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 336                 NTLMSSP_NEGOTIATE_SIGN |
 337                 NTLMSSP_NEGOTIATE_SEAL;
 338
 339         ntlmssp_state->server.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
 340         if (!ntlmssp_state->server.netbios_name) {
 341                 talloc_free(ntlmssp_state);
 342                 return NT_STATUS_NO_MEMORY;
 343         }
 344         ntlmssp_state->server.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
 345         if (!ntlmssp_state->server.netbios_domain) {
 346                 talloc_free(ntlmssp_state);
 347                 return NT_STATUS_NO_MEMORY;
 348         }
 349         ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state, dns_name);
 350         if (!ntlmssp_state->server.dns_name) {
 351                 talloc_free(ntlmssp_state);
 352                 return NT_STATUS_NO_MEMORY;
 353         }
 354         ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state, dns_domain);
 355         if (!ntlmssp_state->server.dns_domain) {
 356                 talloc_free(ntlmssp_state);
 357                 return NT_STATUS_NO_MEMORY;
 358         }
 359
 360         *_ntlmssp_state = ntlmssp_state;
 361         return NT_STATUS_OK;
 362 }
 363
 364 /*********************************************************************
 365  Client side NTLMSSP
 366 *********************************************************************/
 367
 368 /**
 369  * Next state function for the Initial packet
 370  *
 371  * @param ntlmssp_state NTLMSSP State
 372  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 373  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 374  * @return Errors or NT_STATUS_OK.
 375  */
 376
 377 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
 378                                   TALLOC_CTX *out_mem_ctx, /* Unused at this time */
 379                                   DATA_BLOB reply, DATA_BLOB *next_request)
 380 {
 381         NTSTATUS status;
 382
 383         if (ntlmssp_state->unicode) {
 384                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 385         } else {
 386                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 387         }
 388
 389         if (ntlmssp_state->use_ntlmv2) {
 390                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 391         }
 392
 393         /* generate the ntlmssp negotiate packet */
 394         status = msrpc_gen(ntlmssp_state, next_request, "CddAA",
 395                   "NTLMSSP",
 396                   NTLMSSP_NEGOTIATE,
 397                   ntlmssp_state->neg_flags,
 398                   ntlmssp_state->client.netbios_domain,
 399                   ntlmssp_state->client.netbios_name);
 400         if (!NT_STATUS_IS_OK(status)) {
 401                 DEBUG(0, ("ntlmssp_client_initial: failed to generate "
 402                         "ntlmssp negotiate packet\n"));
 403                 return status;
 404         }
 405
 406         if (DEBUGLEVEL >= 10) {
 407                 struct NEGOTIATE_MESSAGE *negotiate = talloc(
 408                         talloc_tos(), struct NEGOTIATE_MESSAGE);
 409                 if (negotiate != NULL) {
 410                         status = ntlmssp_pull_NEGOTIATE_MESSAGE(
 411                                 next_request, negotiate, negotiate);
 412                         if (NT_STATUS_IS_OK(status)) {
 413                                 NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
 414                                                 negotiate);
 415                         }
 416                         TALLOC_FREE(negotiate);
 417                 }
 418         }
 419
 420         ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
 421
 422         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 423 }
 424
 425 /**
 426  * Next state function for the Challenge Packet.  Generate an auth packet.
 427  *
 428  * @param ntlmssp_state NTLMSSP State
 429  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 430  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 431  * @return Errors or NT_STATUS_OK.
 432  */
 433
 434 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
 435                                          TALLOC_CTX *out_mem_ctx, /* Unused at this time */
 436                                          const DATA_BLOB reply, DATA_BLOB *next_request)
 437 {
 438         uint32_t chal_flags, ntlmssp_command, unkn1, unkn2;
 439         DATA_BLOB server_domain_blob;
 440         DATA_BLOB challenge_blob;
 441         DATA_BLOB struct_blob = data_blob_null;
 442         char *server_domain;
 443         const char *chal_parse_string;
 444         const char *auth_gen_string;
 445         DATA_BLOB lm_response = data_blob_null;
 446         DATA_BLOB nt_response = data_blob_null;
 447         DATA_BLOB session_key = data_blob_null;
 448         DATA_BLOB encrypted_session_key = data_blob_null;
 449         NTSTATUS nt_status = NT_STATUS_OK;
 450
 451         if (ntlmssp_state->use_ccache) {
 452                 struct wbcCredentialCacheParams params;
 453                 struct wbcCredentialCacheInfo *info = NULL;
 454                 struct wbcAuthErrorInfo *error = NULL;
 455                 struct wbcNamedBlob auth_blob;
 456                 struct wbcBlob *wbc_next = NULL;
 457                 struct wbcBlob *wbc_session_key = NULL;
 458                 wbcErr wbc_status;
 459                 int i;
 460
 461                 params.account_name = ntlmssp_state->user;
 462                 params.domain_name = ntlmssp_state->domain;
 463                 params.level = WBC_CREDENTIAL_CACHE_LEVEL_NTLMSSP;
 464
 465                 auth_blob.name = "challenge_blob";
 466                 auth_blob.flags = 0;
 467                 auth_blob.blob.data = reply.data;
 468                 auth_blob.blob.length = reply.length;
 469                 params.num_blobs = 1;
 470                 params.blobs = &auth_blob;
 471
 472                 wbc_status = wbcCredentialCache(&params, &info, &error);
 473                 wbcFreeMemory(error);
 474                 if (!WBC_ERROR_IS_OK(wbc_status)) {
 475                         goto noccache;
 476                 }
 477
 478                 for (i=0; i<info->num_blobs; i++) {
 479                         if (strequal(info->blobs[i].name, "auth_blob")) {
 480                                 wbc_next = &info->blobs[i].blob;
 481                         }
 482                         if (strequal(info->blobs[i].name, "session_key")) {
 483                                 wbc_session_key = &info->blobs[i].blob;
 484                         }
 485                 }
 486                 if ((wbc_next == NULL) || (wbc_session_key == NULL)) {
 487                         wbcFreeMemory(info);
 488                         goto noccache;
 489                 }
 490
 491                 *next_request = data_blob(wbc_next->data, wbc_next->length);
 492                 ntlmssp_state->session_key = data_blob(
 493                         wbc_session_key->data, wbc_session_key->length);
 494
 495                 wbcFreeMemory(info);
 496                 goto done;
 497         }
 498
 499 noccache:
 500
 501         if (!msrpc_parse(ntlmssp_state, &reply, "CdBd",
 502                          "NTLMSSP",
 503                          &ntlmssp_command,
 504                          &server_domain_blob,
 505                          &chal_flags)) {
 506                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
 507                 dump_data(2, reply.data, reply.length);
 508
 509                 return NT_STATUS_INVALID_PARAMETER;
 510         }
 511
 512         if (DEBUGLEVEL >= 10) {
 513                 struct CHALLENGE_MESSAGE *challenge = talloc(
 514                         talloc_tos(), struct CHALLENGE_MESSAGE);
 515                 if (challenge != NULL) {
 516                         NTSTATUS status;
 517                         challenge->NegotiateFlags = chal_flags;
 518                         status = ntlmssp_pull_CHALLENGE_MESSAGE(
 519                                 &reply, challenge, challenge);
 520                         if (NT_STATUS_IS_OK(status)) {
 521                                 NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
 522                                                 challenge);
 523                         }
 524                         TALLOC_FREE(challenge);
 525                 }
 526         }
 527
 528         data_blob_free(&server_domain_blob);
 529
 530         DEBUG(3, ("Got challenge flags:\n"));
 531         debug_ntlmssp_flags(chal_flags);
 532
 533         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
 534
 535         if (ntlmssp_state->unicode) {
 536                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
 537                         chal_parse_string = "CdUdbddB";
 538                 } else {
 539                         chal_parse_string = "CdUdbdd";
 540                 }
 541                 auth_gen_string = "CdBBUUUBd";
 542         } else {
 543                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
 544                         chal_parse_string = "CdAdbddB";
 545                 } else {
 546                         chal_parse_string = "CdAdbdd";
 547                 }
 548
 549                 auth_gen_string = "CdBBAAABd";
 550         }
 551
 552         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
 553         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
 554
 555         if (!msrpc_parse(ntlmssp_state, &reply, chal_parse_string,
 556                          "NTLMSSP",
 557                          &ntlmssp_command,
 558                          &server_domain,
 559                          &chal_flags,
 560                          &challenge_blob, 8,
 561                          &unkn1, &unkn2,
 562                          &struct_blob)) {
 563                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
 564                 dump_data(2, reply.data, reply.length);
 565                 return NT_STATUS_INVALID_PARAMETER;
 566         }
 567
 568         if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
 569                 ntlmssp_state->server.is_standalone = true;
 570         } else {
 571                 ntlmssp_state->server.is_standalone = false;
 572         }
 573         /* TODO: parse struct_blob and fill in the rest */
 574         ntlmssp_state->server.netbios_name = "";
 575         ntlmssp_state->server.netbios_domain = server_domain;
 576         ntlmssp_state->server.dns_name = "";
 577         ntlmssp_state->server.dns_domain = "";
 578
 579         if (challenge_blob.length != 8) {
 580                 data_blob_free(&struct_blob);
 581                 return NT_STATUS_INVALID_PARAMETER;
 582         }
 583
 584         if (!ntlmssp_state->nt_hash || !ntlmssp_state->lm_hash) {
 585                 static const uint8_t zeros[16] = {0, };
 586                 /* do nothing - blobs are zero length */
 587
 588                 /* session key is all zeros */
 589                 session_key = data_blob_talloc(ntlmssp_state, zeros, 16);
 590
 591                 /* not doing NLTM2 without a password */
 592                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 593         } else if (ntlmssp_state->use_ntlmv2) {
 594                 if (!struct_blob.length) {
 595                         /* be lazy, match win2k - we can't do NTLMv2 without it */
 596                         DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
 597                         return NT_STATUS_INVALID_PARAMETER;
 598                 }
 599
 600                 /* TODO: if the remote server is standalone, then we should replace 'domain'
 601                    with the server name as supplied above */
 602
 603                 if (!SMBNTLMv2encrypt_hash(ntlmssp_state,
 604                                            ntlmssp_state->user,
 605                                            ntlmssp_state->domain,
 606                                            ntlmssp_state->nt_hash, &challenge_blob,
 607                                            &struct_blob,
 608                                            &lm_response, &nt_response, NULL,
 609                                            &session_key)) {
 610                         data_blob_free(&challenge_blob);
 611                         data_blob_free(&struct_blob);
 612                         return NT_STATUS_NO_MEMORY;
 613                 }
 614         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 615                 struct MD5Context md5_session_nonce_ctx;
 616                 uint8_t session_nonce[16];
 617                 uint8_t session_nonce_hash[16];
 618                 uint8_t user_session_key[16];
 619
 620                 lm_response = data_blob_talloc(ntlmssp_state, NULL, 24);
 621                 generate_random_buffer(lm_response.data, 8);
 622                 memset(lm_response.data+8, 0, 16);
 623
 624                 memcpy(session_nonce, challenge_blob.data, 8);
 625                 memcpy(&session_nonce[8], lm_response.data, 8);
 626
 627                 MD5Init(&md5_session_nonce_ctx);
 628                 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
 629                 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
 630                 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 631
 632                 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
 633                 DEBUG(5, ("challenge is: \n"));
 634                 dump_data(5, session_nonce_hash, 8);
 635
 636                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
 637                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,
 638                                   session_nonce_hash,
 639                                   nt_response.data);
 640
 641                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 642
 643                 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, user_session_key);
 644                 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
 645                 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 646         } else {
 647                 /* lanman auth is insecure, it may be disabled */
 648                 if (lp_client_lanman_auth()) {
 649                         lm_response = data_blob_talloc(ntlmssp_state,
 650                                                        NULL, 24);
 651                         SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
 652                                    lm_response.data);
 653                 }
 654
 655                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
 656                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
 657                              nt_response.data);
 658
 659                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 660                 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 661                     && lp_client_lanman_auth()) {
 662                         SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
 663                                         session_key.data);
 664                         dump_data_pw("LM session key\n", session_key.data, session_key.length);
 665                 } else {
 666                         SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, session_key.data);
 667                         dump_data_pw("NT session key:\n", session_key.data, session_key.length);
 668                 }
 669         }
 670         data_blob_free(&struct_blob);
 671
 672         /* Key exchange encryptes a new client-generated session key with
 673            the password-derived key */
 674         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 675                 /* Make up a new session key */
 676                 uint8_t client_session_key[16];
 677                 generate_random_buffer(client_session_key, sizeof(client_session_key));
 678
 679                 /* Encrypt the new session key with the old one */
 680                 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
 681                 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
 682                 arcfour_crypt_blob(encrypted_session_key.data, encrypted_session_key.length, &session_key);
 683                 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
 684
 685                 /* Mark the new session key as the 'real' session key */
 686                 data_blob_free(&session_key);
 687                 session_key = data_blob_talloc(ntlmssp_state,
 688                                                client_session_key,
 689                                                sizeof(client_session_key));
 690         }
 691
 692         /* this generates the actual auth packet */
 693         nt_status = msrpc_gen(ntlmssp_state, next_request, auth_gen_string,
 694                        "NTLMSSP",
 695                        NTLMSSP_AUTH,
 696                        lm_response.data, lm_response.length,
 697                        nt_response.data, nt_response.length,
 698                        ntlmssp_state->domain,
 699                        ntlmssp_state->user,
 700                        ntlmssp_state->client.netbios_name,
 701                        encrypted_session_key.data, encrypted_session_key.length,
 702                        ntlmssp_state->neg_flags);
 703
 704         if (!NT_STATUS_IS_OK(nt_status)) {
 705                 return NT_STATUS_NO_MEMORY;
 706         }
 707
 708         if (DEBUGLEVEL >= 10) {
 709                 struct AUTHENTICATE_MESSAGE *authenticate = talloc(
 710                         talloc_tos(), struct AUTHENTICATE_MESSAGE);
 711                 if (authenticate != NULL) {
 712                         NTSTATUS status;
 713                         authenticate->NegotiateFlags =
 714                                 ntlmssp_state->neg_flags;
 715                         status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
 716                                 next_request, authenticate, authenticate);
 717                         if (NT_STATUS_IS_OK(status)) {
 718                                 NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
 719                                                 authenticate);
 720                         }
 721                         TALLOC_FREE(authenticate);
 722                 }
 723         }
 724
 725         data_blob_free(&encrypted_session_key);
 726
 727         data_blob_free(&ntlmssp_state->chal);
 728
 729         ntlmssp_state->session_key = session_key;
 730
 731         ntlmssp_state->chal = challenge_blob;
 732         ntlmssp_state->lm_resp = lm_response;
 733         ntlmssp_state->nt_resp = nt_response;
 734
 735 done:
 736
 737         ntlmssp_state->expected_state = NTLMSSP_DONE;
 738
 739         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
 740                 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
 741         }
 742
 743         return nt_status;
 744 }
 745
 746 NTSTATUS ntlmssp_client_start(TALLOC_CTX *mem_ctx,
 747                               const char *netbios_name,
 748                               const char *netbios_domain,
 749                               bool use_ntlmv2,
 750                               struct ntlmssp_state **_ntlmssp_state)
 751 {
 752         struct ntlmssp_state *ntlmssp_state;
 753
 754         if (!netbios_name) {
 755                 netbios_name = "";
 756         }
 757
 758         if (!netbios_domain) {
 759                 netbios_domain = "";
 760         }
 761
 762         ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
 763         if (!ntlmssp_state) {
 764                 return NT_STATUS_NO_MEMORY;
 765         }
 766
 767         ntlmssp_state->role = NTLMSSP_CLIENT;
 768
 769         ntlmssp_state->unicode = True;
 770
 771         ntlmssp_state->use_ntlmv2 = use_ntlmv2;
 772
 773         ntlmssp_state->expected_state = NTLMSSP_INITIAL;
 774
 775         ntlmssp_state->neg_flags =
 776                 NTLMSSP_NEGOTIATE_128 |
 777                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
 778                 NTLMSSP_NEGOTIATE_NTLM |
 779                 NTLMSSP_NEGOTIATE_NTLM2 |
 780                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 781                 NTLMSSP_REQUEST_TARGET;
 782
 783         ntlmssp_state->client.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
 784         if (!ntlmssp_state->client.netbios_name) {
 785                 talloc_free(ntlmssp_state);
 786                 return NT_STATUS_NO_MEMORY;
 787         }
 788         ntlmssp_state->client.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
 789         if (!ntlmssp_state->client.netbios_domain) {
 790                 talloc_free(ntlmssp_state);
 791                 return NT_STATUS_NO_MEMORY;
 792         }
 793
 794         *_ntlmssp_state = ntlmssp_state;
 795         return NT_STATUS_OK;
 796 }