source3/libsmb/ntlmssp.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    handle NLTMSSP, server side
   5
   6    Copyright (C) Andrew Tridgell      2001
   7    Copyright (C) Andrew Bartlett 2001-2010
   8    Copyright (C) Stefan Metzmacher 2005
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "../auth/ntlmssp/ntlmssp.h"
  26 #include "../auth/ntlmssp/ntlmssp_private.h"
  27 #include "../libcli/auth/libcli_auth.h"
  28 #include "../librpc/gen_ndr/ndr_ntlmssp.h"
  29 #include "../auth/ntlmssp/ntlmssp_ndr.h"
  30 #include "../lib/crypto/md5.h"
  31 #include "../lib/crypto/arcfour.h"
  32 #include "../lib/crypto/hmacmd5.h"
  33 #include "../nsswitch/libwbclient/wbclient.h"
  34
  35 static NTSTATUS ntlmssp3_client_initial(struct ntlmssp_state *ntlmssp_state,
  36                                        TALLOC_CTX *out_mem_ctx,
  37                                        DATA_BLOB reply, DATA_BLOB *next_request);
  38 static NTSTATUS ntlmssp3_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, ntlmssp3_client_initial},
  54         {NTLMSSP_CLIENT, NTLMSSP_CHALLENGE, ntlmssp3_client_challenge},
  55         {NTLMSSP_CLIENT, NTLMSSP_UNKNOWN, NULL},
  56         {NTLMSSP_SERVER, NTLMSSP_UNKNOWN, NULL}
  57 };
  58
  59 /**
  60  * Set a username on an NTLMSSP context - ensures it is talloc()ed
  61  *
  62  */
  63
  64 NTSTATUS ntlmssp_set_username(struct ntlmssp_state *ntlmssp_state, const char *user)
  65 {
  66         ntlmssp_state->user = talloc_strdup(ntlmssp_state, user ? user : "" );
  67         if (!ntlmssp_state->user) {
  68                 return NT_STATUS_NO_MEMORY;
  69         }
  70         return NT_STATUS_OK;
  71 }
  72
  73 /**
  74  * Converts a password to the hashes on an NTLMSSP context.
  75  *
  76  */
  77 NTSTATUS ntlmssp_set_password(struct ntlmssp_state *ntlmssp_state, const char *password)
  78 {
  79         uint8_t lm_hash[16];
  80         uint8_t nt_hash[16];
  81
  82         TALLOC_FREE(ntlmssp_state->lm_hash);
  83         TALLOC_FREE(ntlmssp_state->nt_hash);
  84
  85         if (password == NULL) {
  86                 return NT_STATUS_OK;
  87         }
  88
  89         if (E_deshash(password, lm_hash)) {
  90                 ntlmssp_state->lm_hash = (uint8_t *)
  91                         talloc_memdup(ntlmssp_state, lm_hash, 16);
  92                 if (!ntlmssp_state->lm_hash) {
  93                         return NT_STATUS_NO_MEMORY;
  94                 }
  95         }
  96
  97         E_md4hash(password, nt_hash);
  98
  99         ntlmssp_state->nt_hash = (uint8_t *)
 100                 talloc_memdup(ntlmssp_state, nt_hash, 16);
 101         if (!ntlmssp_state->nt_hash) {
 102                 TALLOC_FREE(ntlmssp_state->lm_hash);
 103                 return NT_STATUS_NO_MEMORY;
 104         }
 105
 106         return NT_STATUS_OK;
 107 }
 108
 109 /**
 110  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
 111  *
 112  */
 113 NTSTATUS ntlmssp_set_domain(struct ntlmssp_state *ntlmssp_state, const char *domain)
 114 {
 115         ntlmssp_state->domain = talloc_strdup(ntlmssp_state,
 116                                               domain ? domain : "" );
 117         if (!ntlmssp_state->domain) {
 118                 return NT_STATUS_NO_MEMORY;
 119         }
 120         return NT_STATUS_OK;
 121 }
 122
 123 /**
 124  * Request features for the NTLMSSP negotiation
 125  *
 126  * @param ntlmssp_state NTLMSSP state
 127  * @param feature_list List of space seperated features requested from NTLMSSP.
 128  */
 129 void ntlmssp_want_feature_list(struct ntlmssp_state *ntlmssp_state, char *feature_list)
 130 {
 131         /*
 132          * We need to set this to allow a later SetPassword
 133          * via the SAMR pipe to succeed. Strange.... We could
 134          * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
 135          */
 136         if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, True)) {
 137                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 138         }
 139         if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, True)) {
 140                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 141         }
 142         if(in_list("NTLMSSP_FEATURE_SEAL", feature_list, True)) {
 143                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 144         }
 145         if (in_list("NTLMSSP_FEATURE_CCACHE", feature_list, true)) {
 146                 ntlmssp_state->use_ccache = true;
 147         }
 148 }
 149
 150 /**
 151  * Request a feature for the NTLMSSP negotiation
 152  *
 153  * @param ntlmssp_state NTLMSSP state
 154  * @param feature Bit flag specifying the requested feature
 155  */
 156 void ntlmssp_want_feature(struct ntlmssp_state *ntlmssp_state, uint32_t feature)
 157 {
 158         /* As per JRA's comment above */
 159         if (feature & NTLMSSP_FEATURE_SESSION_KEY) {
 160                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 161         }
 162         if (feature & NTLMSSP_FEATURE_SIGN) {
 163                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 164         }
 165         if (feature & NTLMSSP_FEATURE_SEAL) {
 166                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 167                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 168         }
 169         if (feature & NTLMSSP_FEATURE_CCACHE) {
 170                 ntlmssp_state->use_ccache = true;
 171         }
 172 }
 173
 174 /**
 175  * Next state function for the NTLMSSP state machine
 176  *
 177  * @param ntlmssp_state NTLMSSP State
 178  * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
 179  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 180  * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
 181  */
 182
 183 NTSTATUS ntlmssp_update(struct ntlmssp_state *ntlmssp_state,
 184                         const DATA_BLOB input, DATA_BLOB *out)
 185 {
 186         uint32_t ntlmssp_command;
 187         int i;
 188
 189         if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
 190                 /* Called update after negotiations finished. */
 191                 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
 192                 return NT_STATUS_INVALID_PARAMETER;
 193         }
 194
 195         *out = data_blob_null;
 196
 197         if (!input.length) {
 198                 switch (ntlmssp_state->role) {
 199                 case NTLMSSP_CLIENT:
 200                         ntlmssp_command = NTLMSSP_INITIAL;
 201                         break;
 202                 case NTLMSSP_SERVER:
 203                         /* 'datagram' mode - no neg packet */
 204                         ntlmssp_command = NTLMSSP_NEGOTIATE;
 205                         break;
 206                 default:
 207                         DEBUG(1, ("Invalid role: %d\n", ntlmssp_state->role));
 208                         return NT_STATUS_INVALID_PARAMETER;
 209                 }
 210         } else {
 211                 if (!msrpc_parse(ntlmssp_state, &input, "Cd",
 212                                  "NTLMSSP",
 213                                  &ntlmssp_command)) {
 214                         DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
 215                         dump_data(2, input.data, input.length);
 216                         return NT_STATUS_INVALID_PARAMETER;
 217                 }
 218         }
 219
 220         if (ntlmssp_command != ntlmssp_state->expected_state) {
 221                 DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
 222                 return NT_STATUS_INVALID_PARAMETER;
 223         }
 224
 225         for (i=0; ntlmssp_callbacks[i].fn; i++) {
 226                 if (ntlmssp_callbacks[i].role == ntlmssp_state->role
 227                     && ntlmssp_callbacks[i].ntlmssp_command == ntlmssp_command) {
 228                         return ntlmssp_callbacks[i].fn(ntlmssp_state, ntlmssp_state, input, out);
 229                 }
 230         }
 231
 232         DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
 233                   ntlmssp_state->role, ntlmssp_command));
 234
 235         return NT_STATUS_INVALID_PARAMETER;
 236 }
 237
 238 /*********************************************************************
 239  Client side NTLMSSP
 240 *********************************************************************/
 241
 242 /**
 243  * Next state function for the Initial packet
 244  *
 245  * @param ntlmssp_state NTLMSSP State
 246  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 247  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 248  * @return Errors or NT_STATUS_OK.
 249  */
 250
 251 static NTSTATUS ntlmssp3_client_initial(struct ntlmssp_state *ntlmssp_state,
 252                                        TALLOC_CTX *out_mem_ctx,
 253                                        DATA_BLOB in, DATA_BLOB *out)
 254 {
 255         const char *domain = ntlmssp_state->client.netbios_domain;
 256         const char *workstation = ntlmssp_state->client.netbios_name;
 257         NTSTATUS status;
 258
 259         /* These don't really matter in the initial packet, so don't panic if they are not set */
 260         if (!domain) {
 261                 domain = "";
 262         }
 263
 264         if (!workstation) {
 265                 workstation = "";
 266         }
 267
 268         if (ntlmssp_state->unicode) {
 269                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 270         } else {
 271                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 272         }
 273
 274         if (ntlmssp_state->use_ntlmv2) {
 275                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 276         }
 277
 278         /* generate the ntlmssp negotiate packet */
 279         status = msrpc_gen(out_mem_ctx,
 280                   out, "CddAA",
 281                   "NTLMSSP",
 282                   NTLMSSP_NEGOTIATE,
 283                   ntlmssp_state->neg_flags,
 284                   domain,
 285                   workstation);
 286
 287         if (!NT_STATUS_IS_OK(status)) {
 288                 DEBUG(0, ("ntlmssp_client_initial: failed to generate "
 289                           "ntlmssp negotiate packet\n"));
 290                 return status;
 291         }
 292
 293         if (DEBUGLEVEL >= 10) {
 294                 struct NEGOTIATE_MESSAGE *negotiate = talloc(
 295                         talloc_tos(), struct NEGOTIATE_MESSAGE);
 296                 if (negotiate != NULL) {
 297                         status = ntlmssp_pull_NEGOTIATE_MESSAGE(
 298                                 out, negotiate, negotiate);
 299                         if (NT_STATUS_IS_OK(status)) {
 300                                 NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
 301                                                 negotiate);
 302                         }
 303                         TALLOC_FREE(negotiate);
 304                 }
 305         }
 306
 307         ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
 308
 309         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 310 }
 311
 312 bool ntlmssp_is_anonymous(struct ntlmssp_state *ntlmssp_state)
 313 {
 314         const char *user = ntlmssp_state->user;
 315
 316         if (user == NULL) {
 317                 return true;
 318         }
 319
 320         if (strlen(user) == 0) {
 321                 return true;
 322         }
 323
 324         return false;
 325 }
 326
 327 /**
 328  * Next state function for the Challenge Packet.  Generate an auth packet.
 329  *
 330  * @param ntlmssp_state NTLMSSP State
 331  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 332  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 333  * @return Errors or NT_STATUS_OK.
 334  */
 335
 336 static NTSTATUS ntlmssp3_client_challenge(struct ntlmssp_state *ntlmssp_state,
 337                                          TALLOC_CTX *out_mem_ctx, /* Unused at this time */
 338                                          const DATA_BLOB reply, DATA_BLOB *next_request)
 339 {
 340         uint32_t chal_flags, ntlmssp_command, unkn1, unkn2;
 341         DATA_BLOB server_domain_blob;
 342         DATA_BLOB challenge_blob;
 343         DATA_BLOB struct_blob = data_blob_null;
 344         char *server_domain;
 345         const char *chal_parse_string;
 346         const char *auth_gen_string;
 347         DATA_BLOB lm_response = data_blob_null;
 348         DATA_BLOB nt_response = data_blob_null;
 349         DATA_BLOB session_key = data_blob_null;
 350         DATA_BLOB encrypted_session_key = data_blob_null;
 351         NTSTATUS nt_status = NT_STATUS_OK;
 352         bool anon = ntlmssp_is_anonymous(ntlmssp_state);
 353
 354         if (!anon && ntlmssp_state->use_ccache) {
 355                 struct wbcCredentialCacheParams params;
 356                 struct wbcCredentialCacheInfo *info = NULL;
 357                 struct wbcAuthErrorInfo *error = NULL;
 358                 struct wbcNamedBlob auth_blob;
 359                 struct wbcBlob *wbc_next = NULL;
 360                 struct wbcBlob *wbc_session_key = NULL;
 361                 wbcErr wbc_status;
 362                 int i;
 363
 364                 params.account_name = ntlmssp_state->user;
 365                 params.domain_name = ntlmssp_state->domain;
 366                 params.level = WBC_CREDENTIAL_CACHE_LEVEL_NTLMSSP;
 367
 368                 auth_blob.name = "challenge_blob";
 369                 auth_blob.flags = 0;
 370                 auth_blob.blob.data = reply.data;
 371                 auth_blob.blob.length = reply.length;
 372                 params.num_blobs = 1;
 373                 params.blobs = &auth_blob;
 374
 375                 wbc_status = wbcCredentialCache(&params, &info, &error);
 376                 wbcFreeMemory(error);
 377                 if (!WBC_ERROR_IS_OK(wbc_status)) {
 378                         goto noccache;
 379                 }
 380
 381                 for (i=0; i<info->num_blobs; i++) {
 382                         if (strequal(info->blobs[i].name, "auth_blob")) {
 383                                 wbc_next = &info->blobs[i].blob;
 384                         }
 385                         if (strequal(info->blobs[i].name, "session_key")) {
 386                                 wbc_session_key = &info->blobs[i].blob;
 387                         }
 388                 }
 389                 if ((wbc_next == NULL) || (wbc_session_key == NULL)) {
 390                         wbcFreeMemory(info);
 391                         goto noccache;
 392                 }
 393
 394                 *next_request = data_blob(wbc_next->data, wbc_next->length);
 395                 ntlmssp_state->session_key = data_blob(
 396                         wbc_session_key->data, wbc_session_key->length);
 397
 398                 wbcFreeMemory(info);
 399                 goto done;
 400         }
 401
 402 noccache:
 403
 404         if (!msrpc_parse(ntlmssp_state, &reply, "CdBd",
 405                          "NTLMSSP",
 406                          &ntlmssp_command,
 407                          &server_domain_blob,
 408                          &chal_flags)) {
 409                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
 410                 dump_data(2, reply.data, reply.length);
 411
 412                 return NT_STATUS_INVALID_PARAMETER;
 413         }
 414
 415         if (DEBUGLEVEL >= 10) {
 416                 struct CHALLENGE_MESSAGE *challenge = talloc(
 417                         talloc_tos(), struct CHALLENGE_MESSAGE);
 418                 if (challenge != NULL) {
 419                         NTSTATUS status;
 420                         challenge->NegotiateFlags = chal_flags;
 421                         status = ntlmssp_pull_CHALLENGE_MESSAGE(
 422                                 &reply, challenge, challenge);
 423                         if (NT_STATUS_IS_OK(status)) {
 424                                 NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
 425                                                 challenge);
 426                         }
 427                         TALLOC_FREE(challenge);
 428                 }
 429         }
 430
 431         data_blob_free(&server_domain_blob);
 432
 433         DEBUG(3, ("Got challenge flags:\n"));
 434         debug_ntlmssp_flags(chal_flags);
 435
 436         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
 437
 438         if (ntlmssp_state->unicode) {
 439                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
 440                         chal_parse_string = "CdUdbddB";
 441                 } else {
 442                         chal_parse_string = "CdUdbdd";
 443                 }
 444                 auth_gen_string = "CdBBUUUBd";
 445         } else {
 446                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
 447                         chal_parse_string = "CdAdbddB";
 448                 } else {
 449                         chal_parse_string = "CdAdbdd";
 450                 }
 451
 452                 auth_gen_string = "CdBBAAABd";
 453         }
 454
 455         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
 456         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
 457
 458         if (!msrpc_parse(ntlmssp_state, &reply, chal_parse_string,
 459                          "NTLMSSP",
 460                          &ntlmssp_command,
 461                          &server_domain,
 462                          &chal_flags,
 463                          &challenge_blob, 8,
 464                          &unkn1, &unkn2,
 465                          &struct_blob)) {
 466                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
 467                 dump_data(2, reply.data, reply.length);
 468                 return NT_STATUS_INVALID_PARAMETER;
 469         }
 470
 471         if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
 472                 ntlmssp_state->server.is_standalone = true;
 473         } else {
 474                 ntlmssp_state->server.is_standalone = false;
 475         }
 476         /* TODO: parse struct_blob and fill in the rest */
 477         ntlmssp_state->server.netbios_name = "";
 478         ntlmssp_state->server.netbios_domain = server_domain;
 479         ntlmssp_state->server.dns_name = "";
 480         ntlmssp_state->server.dns_domain = "";
 481
 482         if (challenge_blob.length != 8) {
 483                 data_blob_free(&struct_blob);
 484                 return NT_STATUS_INVALID_PARAMETER;
 485         }
 486
 487         if (anon || !ntlmssp_state->nt_hash) {
 488                 static const uint8_t zeros[16] = {0, };
 489                 /* do nothing - blobs are zero length */
 490
 491                 /* session key is all zeros */
 492                 session_key = data_blob_talloc(ntlmssp_state, zeros, 16);
 493
 494                 /* not doing NLTM2 without a password */
 495                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 496         } else if (ntlmssp_state->use_ntlmv2) {
 497                 if (!struct_blob.length) {
 498                         /* be lazy, match win2k - we can't do NTLMv2 without it */
 499                         DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
 500                         return NT_STATUS_INVALID_PARAMETER;
 501                 }
 502
 503                 /* TODO: if the remote server is standalone, then we should replace 'domain'
 504                    with the server name as supplied above */
 505
 506                 if (!SMBNTLMv2encrypt_hash(ntlmssp_state,
 507                                            ntlmssp_state->user,
 508                                            ntlmssp_state->domain,
 509                                            ntlmssp_state->nt_hash, &challenge_blob,
 510                                            &struct_blob,
 511                                            &lm_response, &nt_response, NULL,
 512                                            &session_key)) {
 513                         data_blob_free(&challenge_blob);
 514                         data_blob_free(&struct_blob);
 515                         return NT_STATUS_NO_MEMORY;
 516                 }
 517         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 518                 struct MD5Context md5_session_nonce_ctx;
 519                 uint8_t session_nonce[16];
 520                 uint8_t session_nonce_hash[16];
 521                 uint8_t user_session_key[16];
 522
 523                 lm_response = data_blob_talloc(ntlmssp_state, NULL, 24);
 524                 generate_random_buffer(lm_response.data, 8);
 525                 memset(lm_response.data+8, 0, 16);
 526
 527                 memcpy(session_nonce, challenge_blob.data, 8);
 528                 memcpy(&session_nonce[8], lm_response.data, 8);
 529
 530                 MD5Init(&md5_session_nonce_ctx);
 531                 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
 532                 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
 533                 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 534
 535                 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
 536                 DEBUG(5, ("challenge is: \n"));
 537                 dump_data(5, session_nonce_hash, 8);
 538
 539                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
 540                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,
 541                                   session_nonce_hash,
 542                                   nt_response.data);
 543
 544                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 545
 546                 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, user_session_key);
 547                 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
 548                 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 549         } else {
 550                 /* lanman auth is insecure, it may be disabled */
 551                 if (lp_client_lanman_auth() && ntlmssp_state->lm_hash) {
 552                         lm_response = data_blob_talloc(ntlmssp_state,
 553                                                        NULL, 24);
 554                         SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
 555                                    lm_response.data);
 556                 }
 557
 558                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
 559                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
 560                              nt_response.data);
 561
 562                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 563                 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 564                     && lp_client_lanman_auth() && ntlmssp_state->lm_hash) {
 565                         SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
 566                                         session_key.data);
 567                         dump_data_pw("LM session key\n", session_key.data, session_key.length);
 568                 } else {
 569                         SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, session_key.data);
 570                         dump_data_pw("NT session key:\n", session_key.data, session_key.length);
 571                 }
 572         }
 573         data_blob_free(&struct_blob);
 574
 575         /* Key exchange encryptes a new client-generated session key with
 576            the password-derived key */
 577         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 578                 /* Make up a new session key */
 579                 uint8_t client_session_key[16];
 580                 generate_random_buffer(client_session_key, sizeof(client_session_key));
 581
 582                 /* Encrypt the new session key with the old one */
 583                 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
 584                 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
 585                 arcfour_crypt_blob(encrypted_session_key.data, encrypted_session_key.length, &session_key);
 586                 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
 587
 588                 /* Mark the new session key as the 'real' session key */
 589                 data_blob_free(&session_key);
 590                 session_key = data_blob_talloc(ntlmssp_state,
 591                                                client_session_key,
 592                                                sizeof(client_session_key));
 593         }
 594
 595         /* this generates the actual auth packet */
 596         nt_status = msrpc_gen(ntlmssp_state, next_request, auth_gen_string,
 597                        "NTLMSSP",
 598                        NTLMSSP_AUTH,
 599                        lm_response.data, lm_response.length,
 600                        nt_response.data, nt_response.length,
 601                        ntlmssp_state->domain,
 602                        ntlmssp_state->user,
 603                        ntlmssp_state->client.netbios_name,
 604                        encrypted_session_key.data, encrypted_session_key.length,
 605                        ntlmssp_state->neg_flags);
 606
 607         if (!NT_STATUS_IS_OK(nt_status)) {
 608                 return NT_STATUS_NO_MEMORY;
 609         }
 610
 611         if (DEBUGLEVEL >= 10) {
 612                 struct AUTHENTICATE_MESSAGE *authenticate = talloc(
 613                         talloc_tos(), struct AUTHENTICATE_MESSAGE);
 614                 if (authenticate != NULL) {
 615                         NTSTATUS status;
 616                         authenticate->NegotiateFlags =
 617                                 ntlmssp_state->neg_flags;
 618                         status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
 619                                 next_request, authenticate, authenticate);
 620                         if (NT_STATUS_IS_OK(status)) {
 621                                 NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
 622                                                 authenticate);
 623                         }
 624                         TALLOC_FREE(authenticate);
 625                 }
 626         }
 627
 628         data_blob_free(&encrypted_session_key);
 629
 630         data_blob_free(&ntlmssp_state->chal);
 631
 632         ntlmssp_state->session_key = session_key;
 633
 634         ntlmssp_state->chal = challenge_blob;
 635         ntlmssp_state->lm_resp = lm_response;
 636         ntlmssp_state->nt_resp = nt_response;
 637
 638 done:
 639
 640         ntlmssp_state->expected_state = NTLMSSP_DONE;
 641
 642         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
 643                 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
 644         }
 645
 646         return nt_status;
 647 }
 648
 649 NTSTATUS ntlmssp_client_start(TALLOC_CTX *mem_ctx,
 650                               const char *netbios_name,
 651                               const char *netbios_domain,
 652                               bool use_ntlmv2,
 653                               struct ntlmssp_state **_ntlmssp_state)
 654 {
 655         struct ntlmssp_state *ntlmssp_state;
 656
 657         if (!netbios_name) {
 658                 netbios_name = "";
 659         }
 660
 661         if (!netbios_domain) {
 662                 netbios_domain = "";
 663         }
 664
 665         ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
 666         if (!ntlmssp_state) {
 667                 return NT_STATUS_NO_MEMORY;
 668         }
 669
 670         ntlmssp_state->role = NTLMSSP_CLIENT;
 671
 672         ntlmssp_state->unicode = True;
 673
 674         ntlmssp_state->use_ntlmv2 = use_ntlmv2;
 675
 676         ntlmssp_state->expected_state = NTLMSSP_INITIAL;
 677
 678         ntlmssp_state->neg_flags =
 679                 NTLMSSP_NEGOTIATE_128 |
 680                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
 681                 NTLMSSP_NEGOTIATE_NTLM |
 682                 NTLMSSP_NEGOTIATE_NTLM2 |
 683                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 684                 NTLMSSP_REQUEST_TARGET;
 685
 686         ntlmssp_state->client.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
 687         if (!ntlmssp_state->client.netbios_name) {
 688                 talloc_free(ntlmssp_state);
 689                 return NT_STATUS_NO_MEMORY;
 690         }
 691         ntlmssp_state->client.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
 692         if (!ntlmssp_state->client.netbios_domain) {
 693                 talloc_free(ntlmssp_state);
 694                 return NT_STATUS_NO_MEMORY;
 695         }
 696
 697         *_ntlmssp_state = ntlmssp_state;
 698         return NT_STATUS_OK;
 699 }