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 NTSTATUS ntlmssp_set_password_hash(struct ntlmssp_state *state,
 110                                    const char *pwhash)
 111 {
 112         char nt_hash[16];
 113         size_t converted;
 114
 115         converted = strhex_to_str(
 116                 nt_hash, sizeof(nt_hash), pwhash, strlen(pwhash));
 117         if (converted != sizeof(nt_hash)) {
 118                 return NT_STATUS_INVALID_PARAMETER;
 119         }
 120
 121         TALLOC_FREE(state->lm_hash);
 122         TALLOC_FREE(state->nt_hash);
 123
 124         state->nt_hash = (uint8_t *)talloc_memdup(state, nt_hash, 16);
 125         if (!state->nt_hash) {
 126                 return NT_STATUS_NO_MEMORY;
 127         }
 128         return NT_STATUS_OK;
 129 }
 130
 131 /**
 132  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
 133  *
 134  */
 135 NTSTATUS ntlmssp_set_domain(struct ntlmssp_state *ntlmssp_state, const char *domain)
 136 {
 137         ntlmssp_state->domain = talloc_strdup(ntlmssp_state,
 138                                               domain ? domain : "" );
 139         if (!ntlmssp_state->domain) {
 140                 return NT_STATUS_NO_MEMORY;
 141         }
 142         return NT_STATUS_OK;
 143 }
 144
 145 /**
 146  * Request features for the NTLMSSP negotiation
 147  *
 148  * @param ntlmssp_state NTLMSSP state
 149  * @param feature_list List of space separated features requested from NTLMSSP.
 150  */
 151 void ntlmssp_want_feature_list(struct ntlmssp_state *ntlmssp_state, char *feature_list)
 152 {
 153         /*
 154          * We need to set this to allow a later SetPassword
 155          * via the SAMR pipe to succeed. Strange.... We could
 156          * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
 157          */
 158         if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, True)) {
 159                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 160         }
 161         if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, True)) {
 162                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 163         }
 164         if(in_list("NTLMSSP_FEATURE_SEAL", feature_list, True)) {
 165                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 166         }
 167         if (in_list("NTLMSSP_FEATURE_CCACHE", feature_list, true)) {
 168                 ntlmssp_state->use_ccache = true;
 169         }
 170 }
 171
 172 /**
 173  * Request a feature for the NTLMSSP negotiation
 174  *
 175  * @param ntlmssp_state NTLMSSP state
 176  * @param feature Bit flag specifying the requested feature
 177  */
 178 void ntlmssp_want_feature(struct ntlmssp_state *ntlmssp_state, uint32_t feature)
 179 {
 180         /* As per JRA's comment above */
 181         if (feature & NTLMSSP_FEATURE_SESSION_KEY) {
 182                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 183         }
 184         if (feature & NTLMSSP_FEATURE_SIGN) {
 185                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 186         }
 187         if (feature & NTLMSSP_FEATURE_SEAL) {
 188                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 189                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 190         }
 191         if (feature & NTLMSSP_FEATURE_CCACHE) {
 192                 ntlmssp_state->use_ccache = true;
 193         }
 194 }
 195
 196 /**
 197  * Next state function for the NTLMSSP state machine
 198  *
 199  * @param ntlmssp_state NTLMSSP State
 200  * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
 201  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 202  * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
 203  */
 204
 205 NTSTATUS ntlmssp_update(struct ntlmssp_state *ntlmssp_state,
 206                         const DATA_BLOB input, DATA_BLOB *out)
 207 {
 208         uint32_t ntlmssp_command;
 209         int i;
 210
 211         if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
 212                 /* Called update after negotiations finished. */
 213                 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
 214                 return NT_STATUS_INVALID_PARAMETER;
 215         }
 216
 217         *out = data_blob_null;
 218
 219         if (!input.length) {
 220                 switch (ntlmssp_state->role) {
 221                 case NTLMSSP_CLIENT:
 222                         ntlmssp_command = NTLMSSP_INITIAL;
 223                         break;
 224                 case NTLMSSP_SERVER:
 225                         /* 'datagram' mode - no neg packet */
 226                         ntlmssp_command = NTLMSSP_NEGOTIATE;
 227                         break;
 228                 default:
 229                         DEBUG(1, ("Invalid role: %d\n", ntlmssp_state->role));
 230                         return NT_STATUS_INVALID_PARAMETER;
 231                 }
 232         } else {
 233                 if (!msrpc_parse(ntlmssp_state, &input, "Cd",
 234                                  "NTLMSSP",
 235                                  &ntlmssp_command)) {
 236                         DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
 237                         dump_data(2, input.data, input.length);
 238                         return NT_STATUS_INVALID_PARAMETER;
 239                 }
 240         }
 241
 242         if (ntlmssp_command != ntlmssp_state->expected_state) {
 243                 DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
 244                 return NT_STATUS_INVALID_PARAMETER;
 245         }
 246
 247         for (i=0; ntlmssp_callbacks[i].fn; i++) {
 248                 if (ntlmssp_callbacks[i].role == ntlmssp_state->role
 249                     && ntlmssp_callbacks[i].ntlmssp_command == ntlmssp_command) {
 250                         return ntlmssp_callbacks[i].fn(ntlmssp_state, ntlmssp_state, input, out);
 251                 }
 252         }
 253
 254         DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
 255                   ntlmssp_state->role, ntlmssp_command));
 256
 257         return NT_STATUS_INVALID_PARAMETER;
 258 }
 259
 260 /*********************************************************************
 261  Client side NTLMSSP
 262 *********************************************************************/
 263
 264 /**
 265  * Next state function for the Initial packet
 266  *
 267  * @param ntlmssp_state NTLMSSP State
 268  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 269  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 270  * @return Errors or NT_STATUS_OK.
 271  */
 272
 273 static NTSTATUS ntlmssp3_client_initial(struct ntlmssp_state *ntlmssp_state,
 274                                        TALLOC_CTX *out_mem_ctx,
 275                                        DATA_BLOB in, DATA_BLOB *out)
 276 {
 277         const char *domain = ntlmssp_state->client.netbios_domain;
 278         const char *workstation = ntlmssp_state->client.netbios_name;
 279         NTSTATUS status;
 280
 281         /* These don't really matter in the initial packet, so don't panic if they are not set */
 282         if (!domain) {
 283                 domain = "";
 284         }
 285
 286         if (!workstation) {
 287                 workstation = "";
 288         }
 289
 290         if (ntlmssp_state->unicode) {
 291                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 292         } else {
 293                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 294         }
 295
 296         if (ntlmssp_state->use_ntlmv2) {
 297                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 298         }
 299
 300         /* generate the ntlmssp negotiate packet */
 301         status = msrpc_gen(out_mem_ctx,
 302                   out, "CddAA",
 303                   "NTLMSSP",
 304                   NTLMSSP_NEGOTIATE,
 305                   ntlmssp_state->neg_flags,
 306                   domain,
 307                   workstation);
 308
 309         if (!NT_STATUS_IS_OK(status)) {
 310                 DEBUG(0, ("ntlmssp_client_initial: failed to generate "
 311                           "ntlmssp negotiate packet\n"));
 312                 return status;
 313         }
 314
 315         if (DEBUGLEVEL >= 10) {
 316                 struct NEGOTIATE_MESSAGE *negotiate = talloc(
 317                         talloc_tos(), struct NEGOTIATE_MESSAGE);
 318                 if (negotiate != NULL) {
 319                         status = ntlmssp_pull_NEGOTIATE_MESSAGE(
 320                                 out, negotiate, negotiate);
 321                         if (NT_STATUS_IS_OK(status)) {
 322                                 NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
 323                                                 negotiate);
 324                         }
 325                         TALLOC_FREE(negotiate);
 326                 }
 327         }
 328
 329         ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
 330
 331         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 332 }
 333
 334 bool ntlmssp_is_anonymous(struct ntlmssp_state *ntlmssp_state)
 335 {
 336         const char *user = ntlmssp_state->user;
 337
 338         if (user == NULL) {
 339                 return true;
 340         }
 341
 342         if (strlen(user) == 0) {
 343                 return true;
 344         }
 345
 346         return false;
 347 }
 348
 349 /**
 350  * Next state function for the Challenge Packet.  Generate an auth packet.
 351  *
 352  * @param ntlmssp_state NTLMSSP State
 353  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 354  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 355  * @return Errors or NT_STATUS_OK.
 356  */
 357
 358 static NTSTATUS ntlmssp3_client_challenge(struct ntlmssp_state *ntlmssp_state,
 359                                          TALLOC_CTX *out_mem_ctx, /* Unused at this time */
 360                                          const DATA_BLOB reply, DATA_BLOB *next_request)
 361 {
 362         uint32_t chal_flags, ntlmssp_command, unkn1, unkn2;
 363         DATA_BLOB server_domain_blob;
 364         DATA_BLOB challenge_blob;
 365         DATA_BLOB struct_blob = data_blob_null;
 366         char *server_domain;
 367         const char *chal_parse_string;
 368         const char *auth_gen_string;
 369         DATA_BLOB lm_response = data_blob_null;
 370         DATA_BLOB nt_response = data_blob_null;
 371         DATA_BLOB session_key = data_blob_null;
 372         DATA_BLOB encrypted_session_key = data_blob_null;
 373         NTSTATUS nt_status = NT_STATUS_OK;
 374         bool anon = ntlmssp_is_anonymous(ntlmssp_state);
 375
 376         if (!anon && ntlmssp_state->use_ccache) {
 377                 struct wbcCredentialCacheParams params;
 378                 struct wbcCredentialCacheInfo *info = NULL;
 379                 struct wbcAuthErrorInfo *error = NULL;
 380                 struct wbcNamedBlob auth_blob;
 381                 struct wbcBlob *wbc_next = NULL;
 382                 struct wbcBlob *wbc_session_key = NULL;
 383                 wbcErr wbc_status;
 384                 int i;
 385
 386                 /*
 387                  * We need to set the netbios name or we are not able to connect
 388                  *  a Windows DC.
 389                  */
 390                 if (ntlmssp_state->server.netbios_domain == NULL ||
 391                     ntlmssp_state->server.netbios_domain[0] == '\0') {
 392                         ntlmssp_state->server.netbios_domain = ntlmssp_state->domain;
 393                 }
 394
 395                 params.account_name = ntlmssp_state->user;
 396                 params.domain_name = ntlmssp_state->domain;
 397                 params.level = WBC_CREDENTIAL_CACHE_LEVEL_NTLMSSP;
 398
 399                 auth_blob.name = "challenge_blob";
 400                 auth_blob.flags = 0;
 401                 auth_blob.blob.data = reply.data;
 402                 auth_blob.blob.length = reply.length;
 403                 params.num_blobs = 1;
 404                 params.blobs = &auth_blob;
 405
 406                 wbc_status = wbcCredentialCache(&params, &info, &error);
 407                 wbcFreeMemory(error);
 408                 if (!WBC_ERROR_IS_OK(wbc_status)) {
 409                         goto noccache;
 410                 }
 411
 412                 for (i=0; i<info->num_blobs; i++) {
 413                         if (strequal(info->blobs[i].name, "auth_blob")) {
 414                                 wbc_next = &info->blobs[i].blob;
 415                         }
 416                         if (strequal(info->blobs[i].name, "session_key")) {
 417                                 wbc_session_key = &info->blobs[i].blob;
 418                         }
 419                 }
 420                 if ((wbc_next == NULL) || (wbc_session_key == NULL)) {
 421                         wbcFreeMemory(info);
 422                         goto noccache;
 423                 }
 424
 425                 *next_request = data_blob_talloc(ntlmssp_state,
 426                                                  wbc_next->data,
 427                                                  wbc_next->length);
 428                 ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state,
 429                                                               wbc_session_key->data,
 430                                                               wbc_session_key->length);
 431
 432                 wbcFreeMemory(info);
 433                 goto done;
 434         }
 435
 436 noccache:
 437
 438         if (!msrpc_parse(ntlmssp_state, &reply, "CdBd",
 439                          "NTLMSSP",
 440                          &ntlmssp_command,
 441                          &server_domain_blob,
 442                          &chal_flags)) {
 443                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
 444                 dump_data(2, reply.data, reply.length);
 445
 446                 return NT_STATUS_INVALID_PARAMETER;
 447         }
 448
 449         if (DEBUGLEVEL >= 10) {
 450                 struct CHALLENGE_MESSAGE *challenge = talloc(
 451                         talloc_tos(), struct CHALLENGE_MESSAGE);
 452                 if (challenge != NULL) {
 453                         NTSTATUS status;
 454                         challenge->NegotiateFlags = chal_flags;
 455                         status = ntlmssp_pull_CHALLENGE_MESSAGE(
 456                                 &reply, challenge, challenge);
 457                         if (NT_STATUS_IS_OK(status)) {
 458                                 NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
 459                                                 challenge);
 460                         }
 461                         TALLOC_FREE(challenge);
 462                 }
 463         }
 464
 465         data_blob_free(&server_domain_blob);
 466
 467         DEBUG(3, ("Got challenge flags:\n"));
 468         debug_ntlmssp_flags(chal_flags);
 469
 470         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
 471
 472         if (ntlmssp_state->unicode) {
 473                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
 474                         chal_parse_string = "CdUdbddB";
 475                 } else {
 476                         chal_parse_string = "CdUdbdd";
 477                 }
 478                 auth_gen_string = "CdBBUUUBd";
 479         } else {
 480                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
 481                         chal_parse_string = "CdAdbddB";
 482                 } else {
 483                         chal_parse_string = "CdAdbdd";
 484                 }
 485
 486                 auth_gen_string = "CdBBAAABd";
 487         }
 488
 489         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
 490         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
 491
 492         if (!msrpc_parse(ntlmssp_state, &reply, chal_parse_string,
 493                          "NTLMSSP",
 494                          &ntlmssp_command,
 495                          &server_domain,
 496                          &chal_flags,
 497                          &challenge_blob, 8,
 498                          &unkn1, &unkn2,
 499                          &struct_blob)) {
 500                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
 501                 dump_data(2, reply.data, reply.length);
 502                 return NT_STATUS_INVALID_PARAMETER;
 503         }
 504
 505         if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
 506                 ntlmssp_state->server.is_standalone = true;
 507         } else {
 508                 ntlmssp_state->server.is_standalone = false;
 509         }
 510         /* TODO: parse struct_blob and fill in the rest */
 511         ntlmssp_state->server.netbios_name = "";
 512         ntlmssp_state->server.netbios_domain = server_domain;
 513         ntlmssp_state->server.dns_name = "";
 514         ntlmssp_state->server.dns_domain = "";
 515
 516         if (challenge_blob.length != 8) {
 517                 data_blob_free(&struct_blob);
 518                 return NT_STATUS_INVALID_PARAMETER;
 519         }
 520
 521         if (anon || !ntlmssp_state->nt_hash) {
 522                 static const uint8_t zeros[16] = {0, };
 523                 /* do nothing - blobs are zero length */
 524
 525                 /* session key is all zeros */
 526                 session_key = data_blob_talloc(ntlmssp_state, zeros, 16);
 527
 528                 /* not doing NLTM2 without a password */
 529                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 530         } else if (ntlmssp_state->use_ntlmv2) {
 531                 if (!struct_blob.length) {
 532                         /* be lazy, match win2k - we can't do NTLMv2 without it */
 533                         DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
 534                         return NT_STATUS_INVALID_PARAMETER;
 535                 }
 536
 537                 /* TODO: if the remote server is standalone, then we should replace 'domain'
 538                    with the server name as supplied above */
 539
 540                 if (!SMBNTLMv2encrypt_hash(ntlmssp_state,
 541                                            ntlmssp_state->user,
 542                                            ntlmssp_state->domain,
 543                                            ntlmssp_state->nt_hash, &challenge_blob,
 544                                            &struct_blob,
 545                                            &lm_response, &nt_response, NULL,
 546                                            &session_key)) {
 547                         data_blob_free(&challenge_blob);
 548                         data_blob_free(&struct_blob);
 549                         return NT_STATUS_NO_MEMORY;
 550                 }
 551         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 552                 MD5_CTX md5_session_nonce_ctx;
 553                 uint8_t session_nonce[16];
 554                 uint8_t session_nonce_hash[16];
 555                 uint8_t user_session_key[16];
 556
 557                 lm_response = data_blob_talloc(ntlmssp_state, NULL, 24);
 558                 generate_random_buffer(lm_response.data, 8);
 559                 memset(lm_response.data+8, 0, 16);
 560
 561                 memcpy(session_nonce, challenge_blob.data, 8);
 562                 memcpy(&session_nonce[8], lm_response.data, 8);
 563
 564                 MD5Init(&md5_session_nonce_ctx);
 565                 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
 566                 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
 567                 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 568
 569                 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
 570                 DEBUG(5, ("challenge is: \n"));
 571                 dump_data(5, session_nonce_hash, 8);
 572
 573                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
 574                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,
 575                                   session_nonce_hash,
 576                                   nt_response.data);
 577
 578                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 579
 580                 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, user_session_key);
 581                 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
 582                 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 583         } else {
 584                 /* lanman auth is insecure, it may be disabled */
 585                 if (lp_client_lanman_auth() && ntlmssp_state->lm_hash) {
 586                         lm_response = data_blob_talloc(ntlmssp_state,
 587                                                        NULL, 24);
 588                         SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
 589                                    lm_response.data);
 590                 }
 591
 592                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
 593                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
 594                              nt_response.data);
 595
 596                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 597                 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 598                     && lp_client_lanman_auth() && ntlmssp_state->lm_hash) {
 599                         SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
 600                                         session_key.data);
 601                         dump_data_pw("LM session key\n", session_key.data, session_key.length);
 602                 } else {
 603                         SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, session_key.data);
 604                         dump_data_pw("NT session key:\n", session_key.data, session_key.length);
 605                 }
 606         }
 607         data_blob_free(&struct_blob);
 608
 609         /* Key exchange encryptes a new client-generated session key with
 610            the password-derived key */
 611         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 612                 /* Make up a new session key */
 613                 uint8_t client_session_key[16];
 614                 generate_random_buffer(client_session_key, sizeof(client_session_key));
 615
 616                 /* Encrypt the new session key with the old one */
 617                 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
 618                 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
 619                 arcfour_crypt_blob(encrypted_session_key.data, encrypted_session_key.length, &session_key);
 620                 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
 621
 622                 /* Mark the new session key as the 'real' session key */
 623                 data_blob_free(&session_key);
 624                 session_key = data_blob_talloc(ntlmssp_state,
 625                                                client_session_key,
 626                                                sizeof(client_session_key));
 627         }
 628
 629         /* this generates the actual auth packet */
 630         nt_status = msrpc_gen(ntlmssp_state, next_request, auth_gen_string,
 631                        "NTLMSSP",
 632                        NTLMSSP_AUTH,
 633                        lm_response.data, lm_response.length,
 634                        nt_response.data, nt_response.length,
 635                        ntlmssp_state->domain,
 636                        ntlmssp_state->user,
 637                        ntlmssp_state->client.netbios_name,
 638                        encrypted_session_key.data, encrypted_session_key.length,
 639                        ntlmssp_state->neg_flags);
 640
 641         if (!NT_STATUS_IS_OK(nt_status)) {
 642                 return NT_STATUS_NO_MEMORY;
 643         }
 644
 645         if (DEBUGLEVEL >= 10) {
 646                 struct AUTHENTICATE_MESSAGE *authenticate = talloc(
 647                         talloc_tos(), struct AUTHENTICATE_MESSAGE);
 648                 if (authenticate != NULL) {
 649                         NTSTATUS status;
 650                         authenticate->NegotiateFlags =
 651                                 ntlmssp_state->neg_flags;
 652                         status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
 653                                 next_request, authenticate, authenticate);
 654                         if (NT_STATUS_IS_OK(status)) {
 655                                 NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
 656                                                 authenticate);
 657                         }
 658                         TALLOC_FREE(authenticate);
 659                 }
 660         }
 661
 662         data_blob_free(&encrypted_session_key);
 663
 664         data_blob_free(&ntlmssp_state->chal);
 665
 666         ntlmssp_state->session_key = session_key;
 667
 668         ntlmssp_state->chal = challenge_blob;
 669         ntlmssp_state->lm_resp = lm_response;
 670         ntlmssp_state->nt_resp = nt_response;
 671
 672 done:
 673
 674         ntlmssp_state->expected_state = NTLMSSP_DONE;
 675
 676         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
 677                 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
 678         }
 679
 680         return nt_status;
 681 }
 682
 683 NTSTATUS ntlmssp_client_start(TALLOC_CTX *mem_ctx,
 684                               const char *netbios_name,
 685                               const char *netbios_domain,
 686                               bool use_ntlmv2,
 687                               struct ntlmssp_state **_ntlmssp_state)
 688 {
 689         struct ntlmssp_state *ntlmssp_state;
 690
 691         if (!netbios_name) {
 692                 netbios_name = "";
 693         }
 694
 695         if (!netbios_domain) {
 696                 netbios_domain = "";
 697         }
 698
 699         ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
 700         if (!ntlmssp_state) {
 701                 return NT_STATUS_NO_MEMORY;
 702         }
 703
 704         ntlmssp_state->role = NTLMSSP_CLIENT;
 705
 706         ntlmssp_state->unicode = True;
 707
 708         ntlmssp_state->use_ntlmv2 = use_ntlmv2;
 709
 710         ntlmssp_state->expected_state = NTLMSSP_INITIAL;
 711
 712         ntlmssp_state->neg_flags =
 713                 NTLMSSP_NEGOTIATE_128 |
 714                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
 715                 NTLMSSP_NEGOTIATE_NTLM |
 716                 NTLMSSP_NEGOTIATE_NTLM2 |
 717                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 718                 NTLMSSP_REQUEST_TARGET;
 719
 720         ntlmssp_state->client.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
 721         if (!ntlmssp_state->client.netbios_name) {
 722                 talloc_free(ntlmssp_state);
 723                 return NT_STATUS_NO_MEMORY;
 724         }
 725         ntlmssp_state->client.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
 726         if (!ntlmssp_state->client.netbios_domain) {
 727                 talloc_free(ntlmssp_state);
 728                 return NT_STATUS_NO_MEMORY;
 729         }
 730
 731         *_ntlmssp_state = ntlmssp_state;
 732         return NT_STATUS_OK;
 733 }