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