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 2001-2003
   8    Copyright (C) Andrew Bartlett 2005 (Updated from gensec).
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "../libcli/auth/ntlmssp.h"
  26 #include "../libcli/auth/ntlmssp_private.h"
  27 #include "../libcli/auth/libcli_auth.h"
  28 #include "../librpc/gen_ndr/ndr_ntlmssp.h"
  29 #include "../libcli/auth/ntlmssp_ndr.h"
  30 #include "../lib/crypto/md5.h"
  31 #include "../lib/crypto/arcfour.h"
  32 #include "../lib/crypto/hmacmd5.h"
  33
  34 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
  35                                        DATA_BLOB reply, DATA_BLOB *next_request);
  36 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
  37                                          const DATA_BLOB in, DATA_BLOB *out);
  38 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
  39                                          const DATA_BLOB reply, DATA_BLOB *next_request);
  40 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
  41                                     const DATA_BLOB request, DATA_BLOB *reply);
  42
  43 /**
  44  * Callbacks for NTLMSSP - for both client and server operating modes
  45  *
  46  */
  47
  48 static const struct ntlmssp_callbacks {
  49         enum ntlmssp_role role;
  50         enum ntlmssp_message_type ntlmssp_command;
  51         NTSTATUS (*fn)(struct ntlmssp_state *ntlmssp_state,
  52                        DATA_BLOB in, DATA_BLOB *out);
  53 } ntlmssp_callbacks[] = {
  54         {NTLMSSP_CLIENT, NTLMSSP_INITIAL, ntlmssp_client_initial},
  55         {NTLMSSP_SERVER, NTLMSSP_NEGOTIATE, ntlmssp_server_negotiate},
  56         {NTLMSSP_CLIENT, NTLMSSP_CHALLENGE, ntlmssp_client_challenge},
  57         {NTLMSSP_SERVER, NTLMSSP_AUTH, ntlmssp_server_auth},
  58         {NTLMSSP_CLIENT, NTLMSSP_UNKNOWN, NULL},
  59         {NTLMSSP_SERVER, NTLMSSP_UNKNOWN, NULL}
  60 };
  61
  62
  63 /**
  64  * Default challenge generation code.
  65  *
  66  */
  67
  68 static NTSTATUS get_challenge(const struct ntlmssp_state *ntlmssp_state,
  69                               uint8_t chal[8])
  70 {
  71         generate_random_buffer(chal, 8);
  72         return NT_STATUS_OK;
  73 }
  74
  75 /**
  76  * Default 'we can set the challenge to anything we like' implementation
  77  *
  78  */
  79
  80 static bool may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
  81 {
  82         return True;
  83 }
  84
  85 /**
  86  * Default 'we can set the challenge to anything we like' implementation
  87  *
  88  * Does not actually do anything, as the value is always in the structure anyway.
  89  *
  90  */
  91
  92 static NTSTATUS set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
  93 {
  94         SMB_ASSERT(challenge->length == 8);
  95         return NT_STATUS_OK;
  96 }
  97
  98 /**
  99  * Set a username on an NTLMSSP context - ensures it is talloc()ed
 100  *
 101  */
 102
 103 NTSTATUS ntlmssp_set_username(struct ntlmssp_state *ntlmssp_state, const char *user)
 104 {
 105         ntlmssp_state->user = talloc_strdup(ntlmssp_state, user ? user : "" );
 106         if (!ntlmssp_state->user) {
 107                 return NT_STATUS_NO_MEMORY;
 108         }
 109         return NT_STATUS_OK;
 110 }
 111
 112 /**
 113  * Store NT and LM hashes on an NTLMSSP context - ensures they are talloc()ed
 114  *
 115  */
 116 NTSTATUS ntlmssp_set_hashes(struct ntlmssp_state *ntlmssp_state,
 117                             const uint8_t lm_hash[16],
 118                             const uint8_t nt_hash[16])
 119 {
 120         ntlmssp_state->lm_hash = (uint8_t *)
 121                 TALLOC_MEMDUP(ntlmssp_state, lm_hash, 16);
 122         ntlmssp_state->nt_hash = (uint8_t *)
 123                 TALLOC_MEMDUP(ntlmssp_state, nt_hash, 16);
 124         if (!ntlmssp_state->lm_hash || !ntlmssp_state->nt_hash) {
 125                 TALLOC_FREE(ntlmssp_state->lm_hash);
 126                 TALLOC_FREE(ntlmssp_state->nt_hash);
 127                 return NT_STATUS_NO_MEMORY;
 128         }
 129         return NT_STATUS_OK;
 130 }
 131
 132 /**
 133  * Converts a password to the hashes on an NTLMSSP context.
 134  *
 135  */
 136 NTSTATUS ntlmssp_set_password(struct ntlmssp_state *ntlmssp_state, const char *password)
 137 {
 138         if (!password) {
 139                 ntlmssp_state->lm_hash = NULL;
 140                 ntlmssp_state->nt_hash = NULL;
 141         } else {
 142                 uint8_t lm_hash[16];
 143                 uint8_t nt_hash[16];
 144
 145                 E_deshash(password, lm_hash);
 146                 E_md4hash(password, nt_hash);
 147                 return ntlmssp_set_hashes(ntlmssp_state, lm_hash, nt_hash);
 148         }
 149         return NT_STATUS_OK;
 150 }
 151
 152 /**
 153  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
 154  *
 155  */
 156 NTSTATUS ntlmssp_set_domain(struct ntlmssp_state *ntlmssp_state, const char *domain)
 157 {
 158         ntlmssp_state->domain = talloc_strdup(ntlmssp_state,
 159                                               domain ? domain : "" );
 160         if (!ntlmssp_state->domain) {
 161                 return NT_STATUS_NO_MEMORY;
 162         }
 163         return NT_STATUS_OK;
 164 }
 165
 166 /**
 167  * Request features for the NTLMSSP negotiation
 168  *
 169  * @param ntlmssp_state NTLMSSP state
 170  * @param feature_list List of space seperated features requested from NTLMSSP.
 171  */
 172 void ntlmssp_want_feature_list(struct ntlmssp_state *ntlmssp_state, char *feature_list)
 173 {
 174         /*
 175          * We need to set this to allow a later SetPassword
 176          * via the SAMR pipe to succeed. Strange.... We could
 177          * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
 178          */
 179         if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, True)) {
 180                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 181         }
 182         if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, True)) {
 183                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 184         }
 185         if(in_list("NTLMSSP_FEATURE_SEAL", feature_list, True)) {
 186                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 187         }
 188         if (in_list("NTLMSSP_FEATURE_CCACHE", feature_list, true)) {
 189                 ntlmssp_state->use_ccache = true;
 190         }
 191 }
 192
 193 /**
 194  * Request a feature for the NTLMSSP negotiation
 195  *
 196  * @param ntlmssp_state NTLMSSP state
 197  * @param feature Bit flag specifying the requested feature
 198  */
 199 void ntlmssp_want_feature(struct ntlmssp_state *ntlmssp_state, uint32_t feature)
 200 {
 201         /* As per JRA's comment above */
 202         if (feature & NTLMSSP_FEATURE_SESSION_KEY) {
 203                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 204         }
 205         if (feature & NTLMSSP_FEATURE_SIGN) {
 206                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 207         }
 208         if (feature & NTLMSSP_FEATURE_SEAL) {
 209                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 210         }
 211         if (feature & NTLMSSP_FEATURE_CCACHE) {
 212                 ntlmssp_state->use_ccache = true;
 213         }
 214 }
 215
 216 /**
 217  * Next state function for the NTLMSSP state machine
 218  *
 219  * @param ntlmssp_state NTLMSSP State
 220  * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
 221  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 222  * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
 223  */
 224
 225 NTSTATUS ntlmssp_update(struct ntlmssp_state *ntlmssp_state,
 226                         const DATA_BLOB input, DATA_BLOB *out)
 227 {
 228         uint32_t ntlmssp_command;
 229         int i;
 230
 231         if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
 232                 /* Called update after negotiations finished. */
 233                 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
 234                 return NT_STATUS_INVALID_PARAMETER;
 235         }
 236
 237         *out = data_blob_null;
 238
 239         if (!input.length) {
 240                 switch (ntlmssp_state->role) {
 241                 case NTLMSSP_CLIENT:
 242                         ntlmssp_command = NTLMSSP_INITIAL;
 243                         break;
 244                 case NTLMSSP_SERVER:
 245                         /* 'datagram' mode - no neg packet */
 246                         ntlmssp_command = NTLMSSP_NEGOTIATE;
 247                         break;
 248                 }
 249         } else {
 250                 if (!msrpc_parse(ntlmssp_state, &input, "Cd",
 251                                  "NTLMSSP",
 252                                  &ntlmssp_command)) {
 253                         DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
 254                         dump_data(2, input.data, input.length);
 255                         return NT_STATUS_INVALID_PARAMETER;
 256                 }
 257         }
 258
 259         if (ntlmssp_command != ntlmssp_state->expected_state) {
 260                 DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
 261                 return NT_STATUS_INVALID_PARAMETER;
 262         }
 263
 264         for (i=0; ntlmssp_callbacks[i].fn; i++) {
 265                 if (ntlmssp_callbacks[i].role == ntlmssp_state->role
 266                     && ntlmssp_callbacks[i].ntlmssp_command == ntlmssp_command) {
 267                         return ntlmssp_callbacks[i].fn(ntlmssp_state, input, out);
 268                 }
 269         }
 270
 271         DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
 272                   ntlmssp_state->role, ntlmssp_command));
 273
 274         return NT_STATUS_INVALID_PARAMETER;
 275 }
 276
 277 /**
 278  * End an NTLMSSP state machine
 279  *
 280  * @param ntlmssp_state NTLMSSP State, free()ed by this function
 281  */
 282
 283 void ntlmssp_end(struct ntlmssp_state **ntlmssp_state)
 284 {
 285         data_blob_free(&(*ntlmssp_state)->chal);
 286         data_blob_free(&(*ntlmssp_state)->lm_resp);
 287         data_blob_free(&(*ntlmssp_state)->nt_resp);
 288         TALLOC_FREE(*ntlmssp_state);
 289
 290         *ntlmssp_state = NULL;
 291         return;
 292 }
 293
 294 /**
 295  * Determine correct target name flags for reply, given server role
 296  * and negotiated flags
 297  *
 298  * @param ntlmssp_state NTLMSSP State
 299  * @param neg_flags The flags from the packet
 300  * @param chal_flags The flags to be set in the reply packet
 301  * @return The 'target name' string.
 302  */
 303
 304 static const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
 305                                        uint32_t neg_flags, uint32_t *chal_flags)
 306 {
 307         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
 308                 *chal_flags |= NTLMSSP_NEGOTIATE_TARGET_INFO;
 309                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
 310                 if (ntlmssp_state->server.is_standalone) {
 311                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
 312                         return ntlmssp_state->server.netbios_name;
 313                 } else {
 314                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
 315                         return ntlmssp_state->server.netbios_domain;
 316                 };
 317         } else {
 318                 return "";
 319         }
 320 }
 321
 322 static void ntlmssp_handle_neg_flags(struct ntlmssp_state *ntlmssp_state,
 323                                      uint32_t neg_flags, bool allow_lm) {
 324         if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
 325                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 326                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_OEM;
 327                 ntlmssp_state->unicode = True;
 328         } else {
 329                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_UNICODE;
 330                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 331                 ntlmssp_state->unicode = False;
 332         }
 333
 334         if ((neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && allow_lm) {
 335                 /* other end forcing us to use LM */
 336                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
 337                 ntlmssp_state->use_ntlmv2 = False;
 338         } else {
 339                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 340         }
 341
 342         if (!(neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)) {
 343                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 344         }
 345
 346         if (!(neg_flags & NTLMSSP_NEGOTIATE_NTLM2)) {
 347                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 348         }
 349
 350         if (!(neg_flags & NTLMSSP_NEGOTIATE_128)) {
 351                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_128;
 352         }
 353
 354         if (!(neg_flags & NTLMSSP_NEGOTIATE_56)) {
 355                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_56;
 356         }
 357
 358         if (!(neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)) {
 359                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_KEY_EXCH;
 360         }
 361
 362         if (!(neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
 363                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN;
 364         }
 365
 366         if (!(neg_flags & NTLMSSP_NEGOTIATE_SEAL)) {
 367                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SEAL;
 368         }
 369
 370         /* Woop Woop - unknown flag for Windows compatibility...
 371            What does this really do ? JRA. */
 372         if (!(neg_flags & NTLMSSP_NEGOTIATE_VERSION)) {
 373                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_VERSION;
 374         }
 375
 376         if ((neg_flags & NTLMSSP_REQUEST_TARGET)) {
 377                 ntlmssp_state->neg_flags |= NTLMSSP_REQUEST_TARGET;
 378         }
 379 }
 380
 381 /**
 382  * Next state function for the Negotiate packet
 383  *
 384  * @param ntlmssp_state NTLMSSP State
 385  * @param request The request, as a DATA_BLOB
 386  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 387  * @return Errors or MORE_PROCESSING_REQUIRED if a reply is sent.
 388  */
 389
 390 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
 391                                          const DATA_BLOB request, DATA_BLOB *reply)
 392 {
 393         DATA_BLOB struct_blob;
 394         uint32_t neg_flags = 0;
 395         uint32_t ntlmssp_command, chal_flags;
 396         uint8_t cryptkey[8];
 397         const char *target_name;
 398         NTSTATUS status;
 399
 400         /* parse the NTLMSSP packet */
 401 #if 0
 402         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 403 #endif
 404
 405         if (request.length) {
 406                 if ((request.length < 16) || !msrpc_parse(ntlmssp_state, &request, "Cdd",
 407                                                           "NTLMSSP",
 408                                                           &ntlmssp_command,
 409                                                           &neg_flags)) {
 410                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
 411                                 (unsigned int)request.length));
 412                         dump_data(2, request.data, request.length);
 413                         return NT_STATUS_INVALID_PARAMETER;
 414                 }
 415                 debug_ntlmssp_flags(neg_flags);
 416
 417                 if (DEBUGLEVEL >= 10) {
 418                         struct NEGOTIATE_MESSAGE *negotiate = talloc(
 419                                 talloc_tos(), struct NEGOTIATE_MESSAGE);
 420                         if (negotiate != NULL) {
 421                                 status = ntlmssp_pull_NEGOTIATE_MESSAGE(
 422                                         &request, negotiate, negotiate);
 423                                 if (NT_STATUS_IS_OK(status)) {
 424                                         NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
 425                                                         negotiate);
 426                                 }
 427                                 TALLOC_FREE(negotiate);
 428                         }
 429                 }
 430         }
 431
 432         ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, lp_lanman_auth());
 433
 434         /* Ask our caller what challenge they would like in the packet */
 435         status = ntlmssp_state->get_challenge(ntlmssp_state, cryptkey);
 436         if (!NT_STATUS_IS_OK(status)) {
 437                 return status;
 438         }
 439
 440         /* Check if we may set the challenge */
 441         if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
 442                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 443         }
 444
 445         /* The flags we send back are not just the negotiated flags,
 446          * they are also 'what is in this packet'.  Therfore, we
 447          * operate on 'chal_flags' from here on
 448          */
 449
 450         chal_flags = ntlmssp_state->neg_flags;
 451
 452         /* get the right name to fill in as 'target' */
 453         target_name = ntlmssp_target_name(ntlmssp_state,
 454                                           neg_flags, &chal_flags);
 455         if (target_name == NULL)
 456                 return NT_STATUS_INVALID_PARAMETER;
 457
 458         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
 459         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state,
 460                                                         cryptkey, 8);
 461
 462         /* This creates the 'blob' of names that appears at the end of the packet */
 463         if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
 464         {
 465                 msrpc_gen(ntlmssp_state, &struct_blob, "aaaaa",
 466                           MsvAvNbDomainName, target_name,
 467                           MsvAvNbComputerName, ntlmssp_state->server.netbios_name,
 468                           MsvAvDnsDomainName, ntlmssp_state->server.dns_domain,
 469                           MsvAvDnsComputerName, ntlmssp_state->server.dns_name,
 470                           MsvAvEOL, "");
 471         } else {
 472                 struct_blob = data_blob_null;
 473         }
 474
 475         {
 476                 /* Marshal the packet in the right format, be it unicode or ASCII */
 477                 const char *gen_string;
 478                 DATA_BLOB version_blob = data_blob_null;
 479
 480                 if (chal_flags & NTLMSSP_NEGOTIATE_VERSION) {
 481                         enum ndr_err_code err;
 482                         struct VERSION vers;
 483
 484                         /* "What Windows returns" as a version number. */
 485                         ZERO_STRUCT(vers);
 486                         vers.ProductMajorVersion = NTLMSSP_WINDOWS_MAJOR_VERSION_6;
 487                         vers.ProductMinorVersion = NTLMSSP_WINDOWS_MINOR_VERSION_1;
 488                         vers.ProductBuild = 0;
 489                         vers.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
 490
 491                         err = ndr_push_struct_blob(&version_blob,
 492                                                 ntlmssp_state,
 493                                                 &vers,
 494                                                 (ndr_push_flags_fn_t)ndr_push_VERSION);
 495
 496                         if (!NDR_ERR_CODE_IS_SUCCESS(err)) {
 497                                 return NT_STATUS_NO_MEMORY;
 498                         }
 499                 }
 500
 501                 if (ntlmssp_state->unicode) {
 502                         gen_string = "CdUdbddBb";
 503                 } else {
 504                         gen_string = "CdAdbddBb";
 505                 }
 506
 507                 msrpc_gen(ntlmssp_state, reply, gen_string,
 508                         "NTLMSSP",
 509                         NTLMSSP_CHALLENGE,
 510                         target_name,
 511                         chal_flags,
 512                         cryptkey, 8,
 513                         0, 0,
 514                         struct_blob.data, struct_blob.length,
 515                         version_blob.data, version_blob.length);
 516
 517                 data_blob_free(&version_blob);
 518
 519                 if (DEBUGLEVEL >= 10) {
 520                         struct CHALLENGE_MESSAGE *challenge = talloc(
 521                                 talloc_tos(), struct CHALLENGE_MESSAGE);
 522                         if (challenge != NULL) {
 523                                 challenge->NegotiateFlags = chal_flags;
 524                                 status = ntlmssp_pull_CHALLENGE_MESSAGE(
 525                                         reply, challenge, challenge);
 526                                 if (NT_STATUS_IS_OK(status)) {
 527                                         NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
 528                                                         challenge);
 529                                 }
 530                                 TALLOC_FREE(challenge);
 531                         }
 532                 }
 533         }
 534
 535         data_blob_free(&struct_blob);
 536
 537         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 538
 539         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 540 }
 541
 542 /**
 543  * Next state function for the Authenticate packet
 544  *
 545  * @param ntlmssp_state NTLMSSP State
 546  * @param request The request, as a DATA_BLOB
 547  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 548  * @return Errors or NT_STATUS_OK.
 549  */
 550
 551 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
 552                                     const DATA_BLOB request, DATA_BLOB *reply)
 553 {
 554         DATA_BLOB encrypted_session_key = data_blob_null;
 555         DATA_BLOB user_session_key = data_blob_null;
 556         DATA_BLOB lm_session_key = data_blob_null;
 557         DATA_BLOB session_key = data_blob_null;
 558         uint32_t ntlmssp_command, auth_flags;
 559         NTSTATUS nt_status = NT_STATUS_OK;
 560
 561         /* used by NTLM2 */
 562         bool doing_ntlm2 = False;
 563
 564         uint8_t session_nonce[16];
 565         uint8_t session_nonce_hash[16];
 566
 567         const char *parse_string;
 568
 569         /* parse the NTLMSSP packet */
 570         *reply = data_blob_null;
 571
 572 #if 0
 573         file_save("ntlmssp_auth.dat", request.data, request.length);
 574 #endif
 575
 576         if (ntlmssp_state->unicode) {
 577                 parse_string = "CdBBUUUBd";
 578         } else {
 579                 parse_string = "CdBBAAABd";
 580         }
 581
 582         data_blob_free(&ntlmssp_state->lm_resp);
 583         data_blob_free(&ntlmssp_state->nt_resp);
 584
 585         ntlmssp_state->user = NULL;
 586         ntlmssp_state->domain = NULL;
 587
 588         /* now the NTLMSSP encoded auth hashes */
 589         if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 590                          "NTLMSSP",
 591                          &ntlmssp_command,
 592                          &ntlmssp_state->lm_resp,
 593                          &ntlmssp_state->nt_resp,
 594                          &ntlmssp_state->domain,
 595                          &ntlmssp_state->user,
 596                          &ntlmssp_state->client.netbios_name,
 597                          &encrypted_session_key,
 598                          &auth_flags)) {
 599                 auth_flags = 0;
 600
 601                 /* Try again with a shorter string (Win9X truncates this packet) */
 602                 if (ntlmssp_state->unicode) {
 603                         parse_string = "CdBBUUU";
 604                 } else {
 605                         parse_string = "CdBBAAA";
 606                 }
 607
 608                 /* now the NTLMSSP encoded auth hashes */
 609                 if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 610                                  "NTLMSSP",
 611                                  &ntlmssp_command,
 612                                  &ntlmssp_state->lm_resp,
 613                                  &ntlmssp_state->nt_resp,
 614                                  &ntlmssp_state->domain,
 615                                  &ntlmssp_state->user,
 616                                  &ntlmssp_state->client.netbios_name)) {
 617                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
 618                         dump_data(2, request.data, request.length);
 619
 620                         return NT_STATUS_INVALID_PARAMETER;
 621                 }
 622         }
 623
 624         if (auth_flags)
 625                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
 626
 627         if (DEBUGLEVEL >= 10) {
 628                 struct AUTHENTICATE_MESSAGE *authenticate = talloc(
 629                         talloc_tos(), struct AUTHENTICATE_MESSAGE);
 630                 if (authenticate != NULL) {
 631                         NTSTATUS status;
 632                         authenticate->NegotiateFlags = auth_flags;
 633                         status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
 634                                 &request, authenticate, authenticate);
 635                         if (NT_STATUS_IS_OK(status)) {
 636                                 NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
 637                                                 authenticate);
 638                         }
 639                         TALLOC_FREE(authenticate);
 640                 }
 641         }
 642
 643         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 644                  ntlmssp_state->user, ntlmssp_state->domain,
 645                  ntlmssp_state->client.netbios_name,
 646                  (unsigned long)ntlmssp_state->lm_resp.length,
 647                  (unsigned long)ntlmssp_state->nt_resp.length));
 648
 649 #if 0
 650         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 651         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 652 #endif
 653
 654         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 655            client challenge
 656
 657            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 658         */
 659         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 660                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 661                         struct MD5Context md5_session_nonce_ctx;
 662                         SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
 663
 664                         doing_ntlm2 = True;
 665
 666                         memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
 667                         memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 668
 669                         MD5Init(&md5_session_nonce_ctx);
 670                         MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
 671                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 672
 673                         ntlmssp_state->chal = data_blob_talloc(
 674                                 ntlmssp_state, session_nonce_hash, 8);
 675
 676                         /* LM response is no longer useful */
 677                         data_blob_free(&ntlmssp_state->lm_resp);
 678
 679                         /* We changed the effective challenge - set it */
 680                         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
 681                                 data_blob_free(&encrypted_session_key);
 682                                 return nt_status;
 683                         }
 684
 685                         /* LM Key is incompatible. */
 686                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 687                 }
 688         }
 689
 690         /*
 691          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 692          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 693          * smb.conf file) and no NTLMv2 response was sent then the password check
 694          * will fail here. JRA.
 695          */
 696
 697         /* Finally, actually ask if the password is OK */
 698
 699         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
 700                                                                        &user_session_key, &lm_session_key))) {
 701                 data_blob_free(&encrypted_session_key);
 702                 return nt_status;
 703         }
 704
 705         dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
 706         dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
 707
 708         /* Handle the different session key derivation for NTLM2 */
 709         if (doing_ntlm2) {
 710                 if (user_session_key.data && user_session_key.length == 16) {
 711                         session_key = data_blob_talloc(ntlmssp_state,
 712                                                        NULL, 16);
 713                         hmac_md5(user_session_key.data, session_nonce,
 714                                  sizeof(session_nonce), session_key.data);
 715                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 716                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 717
 718                 } else {
 719                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 720                         session_key = data_blob_null;
 721                 }
 722         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
 723                 if (lm_session_key.data && lm_session_key.length >= 8) {
 724                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 725                                 session_key = data_blob_talloc(ntlmssp_state,
 726                                                                NULL, 16);
 727                                 if (session_key.data == NULL) {
 728                                         return NT_STATUS_NO_MEMORY;
 729                                 }
 730                                 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
 731                                                           session_key.data);
 732                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 733                         } else {
 734                                 static const uint8_t zeros[24] = {0, };
 735                                 session_key = data_blob_talloc(
 736                                         ntlmssp_state, NULL, 16);
 737                                 if (session_key.data == NULL) {
 738                                         return NT_STATUS_NO_MEMORY;
 739                                 }
 740                                 SMBsesskeygen_lm_sess_key(
 741                                         lm_session_key.data, zeros,
 742                                         session_key.data);
 743                         }
 744                         dump_data_pw("LM session key:\n", session_key.data,
 745                                      session_key.length);
 746                 } else {
 747                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 748                         session_key = data_blob_null;
 749                 }
 750         } else if (user_session_key.data) {
 751                 session_key = user_session_key;
 752                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 753                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 754         } else if (lm_session_key.data) {
 755                 session_key = lm_session_key;
 756                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 757                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 758         } else {
 759                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 760                 session_key = data_blob_null;
 761         }
 762
 763         /* With KEY_EXCH, the client supplies the proposed session key,
 764            but encrypts it with the long-term key */
 765         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 766                 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
 767                         data_blob_free(&encrypted_session_key);
 768                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 769                                   (unsigned int)encrypted_session_key.length));
 770                         return NT_STATUS_INVALID_PARAMETER;
 771                 } else if (!session_key.data || session_key.length != 16) {
 772                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 773                                   (unsigned int)session_key.length));
 774                         ntlmssp_state->session_key = session_key;
 775                 } else {
 776                         dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
 777                         arcfour_crypt_blob(encrypted_session_key.data,
 778                                            encrypted_session_key.length,
 779                                            &session_key);
 780                         ntlmssp_state->session_key = data_blob_talloc(
 781                                 ntlmssp_state, encrypted_session_key.data,
 782                                 encrypted_session_key.length);
 783                         dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
 784                                      encrypted_session_key.length);
 785                 }
 786         } else {
 787                 ntlmssp_state->session_key = session_key;
 788         }
 789
 790         if (!NT_STATUS_IS_OK(nt_status)) {
 791                 ntlmssp_state->session_key = data_blob_null;
 792         } else if (ntlmssp_state->session_key.length) {
 793                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 794         }
 795
 796         data_blob_free(&encrypted_session_key);
 797
 798         /* Only one authentication allowed per server state. */
 799         ntlmssp_state->expected_state = NTLMSSP_DONE;
 800
 801         return nt_status;
 802 }
 803
 804 /**
 805  * Create an NTLMSSP state machine
 806  *
 807  * @param ntlmssp_state NTLMSSP State, allocated by this function
 808  */
 809
 810 NTSTATUS ntlmssp_server_start(TALLOC_CTX *mem_ctx,
 811                               bool is_standalone,
 812                               const char *netbios_name,
 813                               const char *netbios_domain,
 814                               const char *dns_name,
 815                               const char *dns_domain,
 816                               struct ntlmssp_state **_ntlmssp_state)
 817 {
 818         struct ntlmssp_state *ntlmssp_state;
 819
 820         if (!netbios_name) {
 821                 netbios_name = "";
 822         }
 823
 824         if (!netbios_domain) {
 825                 netbios_domain = "";
 826         }
 827
 828         if (!dns_domain) {
 829                 dns_domain = "";
 830         }
 831
 832         if (!dns_name) {
 833                 dns_name = "";
 834         }
 835
 836         ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
 837         if (!ntlmssp_state) {
 838                 return NT_STATUS_NO_MEMORY;
 839         }
 840
 841         ntlmssp_state->role = NTLMSSP_SERVER;
 842
 843         ntlmssp_state->get_challenge = get_challenge;
 844         ntlmssp_state->set_challenge = set_challenge;
 845         ntlmssp_state->may_set_challenge = may_set_challenge;
 846
 847         ntlmssp_state->server.is_standalone = is_standalone;
 848
 849         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 850
 851         ntlmssp_state->neg_flags =
 852                 NTLMSSP_NEGOTIATE_128 |
 853                 NTLMSSP_NEGOTIATE_56 |
 854                 NTLMSSP_NEGOTIATE_VERSION |
 855                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
 856                 NTLMSSP_NEGOTIATE_NTLM |
 857                 NTLMSSP_NEGOTIATE_NTLM2 |
 858                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 859                 NTLMSSP_NEGOTIATE_SIGN |
 860                 NTLMSSP_NEGOTIATE_SEAL;
 861
 862         ntlmssp_state->server.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
 863         if (!ntlmssp_state->server.netbios_name) {
 864                 talloc_free(ntlmssp_state);
 865                 return NT_STATUS_NO_MEMORY;
 866         }
 867         ntlmssp_state->server.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
 868         if (!ntlmssp_state->server.netbios_domain) {
 869                 talloc_free(ntlmssp_state);
 870                 return NT_STATUS_NO_MEMORY;
 871         }
 872         ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state, dns_name);
 873         if (!ntlmssp_state->server.dns_name) {
 874                 talloc_free(ntlmssp_state);
 875                 return NT_STATUS_NO_MEMORY;
 876         }
 877         ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state, dns_domain);
 878         if (!ntlmssp_state->server.dns_domain) {
 879                 talloc_free(ntlmssp_state);
 880                 return NT_STATUS_NO_MEMORY;
 881         }
 882
 883         *_ntlmssp_state = ntlmssp_state;
 884         return NT_STATUS_OK;
 885 }
 886
 887 /*********************************************************************
 888  Client side NTLMSSP
 889 *********************************************************************/
 890
 891 /**
 892  * Next state function for the Initial packet
 893  *
 894  * @param ntlmssp_state NTLMSSP State
 895  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 896  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 897  * @return Errors or NT_STATUS_OK.
 898  */
 899
 900 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
 901                                   DATA_BLOB reply, DATA_BLOB *next_request)
 902 {
 903         if (ntlmssp_state->unicode) {
 904                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 905         } else {
 906                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 907         }
 908
 909         if (ntlmssp_state->use_ntlmv2) {
 910                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 911         }
 912
 913         /* generate the ntlmssp negotiate packet */
 914         msrpc_gen(ntlmssp_state, next_request, "CddAA",
 915                   "NTLMSSP",
 916                   NTLMSSP_NEGOTIATE,
 917                   ntlmssp_state->neg_flags,
 918                   ntlmssp_state->client.netbios_domain,
 919                   ntlmssp_state->client.netbios_name);
 920
 921         if (DEBUGLEVEL >= 10) {
 922                 struct NEGOTIATE_MESSAGE *negotiate = talloc(
 923                         talloc_tos(), struct NEGOTIATE_MESSAGE);
 924                 if (negotiate != NULL) {
 925                         NTSTATUS status;
 926                         status = ntlmssp_pull_NEGOTIATE_MESSAGE(
 927                                 next_request, negotiate, negotiate);
 928                         if (NT_STATUS_IS_OK(status)) {
 929                                 NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
 930                                                 negotiate);
 931                         }
 932                         TALLOC_FREE(negotiate);
 933                 }
 934         }
 935
 936         ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
 937
 938         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 939 }
 940
 941 /**
 942  * Next state function for the Challenge Packet.  Generate an auth packet.
 943  *
 944  * @param ntlmssp_state NTLMSSP State
 945  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 946  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 947  * @return Errors or NT_STATUS_OK.
 948  */
 949
 950 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
 951                                          const DATA_BLOB reply, DATA_BLOB *next_request)
 952 {
 953         uint32_t chal_flags, ntlmssp_command, unkn1, unkn2;
 954         DATA_BLOB server_domain_blob;
 955         DATA_BLOB challenge_blob;
 956         DATA_BLOB struct_blob = data_blob_null;
 957         char *server_domain;
 958         const char *chal_parse_string;
 959         const char *auth_gen_string;
 960         DATA_BLOB lm_response = data_blob_null;
 961         DATA_BLOB nt_response = data_blob_null;
 962         DATA_BLOB session_key = data_blob_null;
 963         DATA_BLOB encrypted_session_key = data_blob_null;
 964         NTSTATUS nt_status = NT_STATUS_OK;
 965
 966         if (ntlmssp_state->use_ccache) {
 967                 struct wbcCredentialCacheParams params;
 968                 struct wbcCredentialCacheInfo *info = NULL;
 969                 struct wbcAuthErrorInfo *error = NULL;
 970                 struct wbcNamedBlob auth_blob;
 971                 struct wbcBlob *wbc_next = NULL;
 972                 struct wbcBlob *wbc_session_key = NULL;
 973                 wbcErr wbc_status;
 974                 int i;
 975
 976                 params.account_name = ntlmssp_state->user;
 977                 params.domain_name = ntlmssp_state->domain;
 978                 params.level = WBC_CREDENTIAL_CACHE_LEVEL_NTLMSSP;
 979
 980                 auth_blob.name = "challenge_blob";
 981                 auth_blob.flags = 0;
 982                 auth_blob.blob.data = reply.data;
 983                 auth_blob.blob.length = reply.length;
 984                 params.num_blobs = 1;
 985                 params.blobs = &auth_blob;
 986
 987                 wbc_status = wbcCredentialCache(&params, &info, &error);
 988                 if (error != NULL) {
 989                         wbcFreeMemory(error);
 990                 }
 991                 if (!WBC_ERROR_IS_OK(wbc_status)) {
 992                         goto noccache;
 993                 }
 994
 995                 for (i=0; i<info->num_blobs; i++) {
 996                         if (strequal(info->blobs[i].name, "auth_blob")) {
 997                                 wbc_next = &info->blobs[i].blob;
 998                         }
 999                         if (strequal(info->blobs[i].name, "session_key")) {
1000                                 wbc_session_key = &info->blobs[i].blob;
1001                         }
1002                 }
1003                 if ((wbc_next == NULL) || (wbc_session_key == NULL)) {
1004                         wbcFreeMemory(info);
1005                         goto noccache;
1006                 }
1007
1008                 *next_request = data_blob(wbc_next->data, wbc_next->length);
1009                 ntlmssp_state->session_key = data_blob(
1010                         wbc_session_key->data, wbc_session_key->length);
1011
1012                 wbcFreeMemory(info);
1013                 goto done;
1014         }
1015
1016 noccache:
1017
1018         if (!msrpc_parse(ntlmssp_state, &reply, "CdBd",
1019                          "NTLMSSP",
1020                          &ntlmssp_command,
1021                          &server_domain_blob,
1022                          &chal_flags)) {
1023                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
1024                 dump_data(2, reply.data, reply.length);
1025
1026                 return NT_STATUS_INVALID_PARAMETER;
1027         }
1028
1029         if (DEBUGLEVEL >= 10) {
1030                 struct CHALLENGE_MESSAGE *challenge = talloc(
1031                         talloc_tos(), struct CHALLENGE_MESSAGE);
1032                 if (challenge != NULL) {
1033                         NTSTATUS status;
1034                         challenge->NegotiateFlags = chal_flags;
1035                         status = ntlmssp_pull_CHALLENGE_MESSAGE(
1036                                 &reply, challenge, challenge);
1037                         if (NT_STATUS_IS_OK(status)) {
1038                                 NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
1039                                                 challenge);
1040                         }
1041                         TALLOC_FREE(challenge);
1042                 }
1043         }
1044
1045         data_blob_free(&server_domain_blob);
1046
1047         DEBUG(3, ("Got challenge flags:\n"));
1048         debug_ntlmssp_flags(chal_flags);
1049
1050         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
1051
1052         if (ntlmssp_state->unicode) {
1053                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
1054                         chal_parse_string = "CdUdbddB";
1055                 } else {
1056                         chal_parse_string = "CdUdbdd";
1057                 }
1058                 auth_gen_string = "CdBBUUUBd";
1059         } else {
1060                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
1061                         chal_parse_string = "CdAdbddB";
1062                 } else {
1063                         chal_parse_string = "CdAdbdd";
1064                 }
1065
1066                 auth_gen_string = "CdBBAAABd";
1067         }
1068
1069         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
1070         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
1071
1072         if (!msrpc_parse(ntlmssp_state, &reply, chal_parse_string,
1073                          "NTLMSSP",
1074                          &ntlmssp_command,
1075                          &server_domain,
1076                          &chal_flags,
1077                          &challenge_blob, 8,
1078                          &unkn1, &unkn2,
1079                          &struct_blob)) {
1080                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
1081                 dump_data(2, reply.data, reply.length);
1082                 return NT_STATUS_INVALID_PARAMETER;
1083         }
1084
1085         if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
1086                 ntlmssp_state->server.is_standalone = true;
1087         } else {
1088                 ntlmssp_state->server.is_standalone = false;
1089         }
1090         /* TODO: parse struct_blob and fill in the rest */
1091         ntlmssp_state->server.netbios_name = "";
1092         ntlmssp_state->server.netbios_domain = server_domain;
1093         ntlmssp_state->server.dns_name = "";
1094         ntlmssp_state->server.dns_domain = "";
1095
1096         if (challenge_blob.length != 8) {
1097                 data_blob_free(&struct_blob);
1098                 return NT_STATUS_INVALID_PARAMETER;
1099         }
1100
1101         if (!ntlmssp_state->nt_hash || !ntlmssp_state->lm_hash) {
1102                 static const uint8_t zeros[16] = {0, };
1103                 /* do nothing - blobs are zero length */
1104
1105                 /* session key is all zeros */
1106                 session_key = data_blob_talloc(ntlmssp_state, zeros, 16);
1107
1108                 /* not doing NLTM2 without a password */
1109                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
1110         } else if (ntlmssp_state->use_ntlmv2) {
1111                 if (!struct_blob.length) {
1112                         /* be lazy, match win2k - we can't do NTLMv2 without it */
1113                         DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
1114                         return NT_STATUS_INVALID_PARAMETER;
1115                 }
1116
1117                 /* TODO: if the remote server is standalone, then we should replace 'domain'
1118                    with the server name as supplied above */
1119
1120                 if (!SMBNTLMv2encrypt_hash(ntlmssp_state,
1121                                            ntlmssp_state->user,
1122                                            ntlmssp_state->domain,
1123                                            ntlmssp_state->nt_hash, &challenge_blob,
1124                                            &struct_blob,
1125                                            &lm_response, &nt_response, NULL,
1126                                            &session_key)) {
1127                         data_blob_free(&challenge_blob);
1128                         data_blob_free(&struct_blob);
1129                         return NT_STATUS_NO_MEMORY;
1130                 }
1131         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
1132                 struct MD5Context md5_session_nonce_ctx;
1133                 uint8_t session_nonce[16];
1134                 uint8_t session_nonce_hash[16];
1135                 uint8_t user_session_key[16];
1136
1137                 lm_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1138                 generate_random_buffer(lm_response.data, 8);
1139                 memset(lm_response.data+8, 0, 16);
1140
1141                 memcpy(session_nonce, challenge_blob.data, 8);
1142                 memcpy(&session_nonce[8], lm_response.data, 8);
1143
1144                 MD5Init(&md5_session_nonce_ctx);
1145                 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
1146                 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
1147                 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
1148
1149                 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
1150                 DEBUG(5, ("challenge is: \n"));
1151                 dump_data(5, session_nonce_hash, 8);
1152
1153                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1154                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,
1155                                   session_nonce_hash,
1156                                   nt_response.data);
1157
1158                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
1159
1160                 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, user_session_key);
1161                 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
1162                 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
1163         } else {
1164                 /* lanman auth is insecure, it may be disabled */
1165                 if (lp_client_lanman_auth()) {
1166                         lm_response = data_blob_talloc(ntlmssp_state,
1167                                                        NULL, 24);
1168                         SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
1169                                    lm_response.data);
1170                 }
1171
1172                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1173                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
1174                              nt_response.data);
1175
1176                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
1177                 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
1178                     && lp_client_lanman_auth()) {
1179                         SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
1180                                         session_key.data);
1181                         dump_data_pw("LM session key\n", session_key.data, session_key.length);
1182                 } else {
1183                         SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, session_key.data);
1184                         dump_data_pw("NT session key:\n", session_key.data, session_key.length);
1185                 }
1186         }
1187         data_blob_free(&struct_blob);
1188
1189         /* Key exchange encryptes a new client-generated session key with
1190            the password-derived key */
1191         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
1192                 /* Make up a new session key */
1193                 uint8_t client_session_key[16];
1194                 generate_random_buffer(client_session_key, sizeof(client_session_key));
1195
1196                 /* Encrypt the new session key with the old one */
1197                 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
1198                 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
1199                 arcfour_crypt_blob(encrypted_session_key.data, encrypted_session_key.length, &session_key);
1200                 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
1201
1202                 /* Mark the new session key as the 'real' session key */
1203                 data_blob_free(&session_key);
1204                 session_key = data_blob_talloc(ntlmssp_state,
1205                                                client_session_key,
1206                                                sizeof(client_session_key));
1207         }
1208
1209         /* this generates the actual auth packet */
1210         if (!msrpc_gen(ntlmssp_state, next_request, auth_gen_string,
1211                        "NTLMSSP",
1212                        NTLMSSP_AUTH,
1213                        lm_response.data, lm_response.length,
1214                        nt_response.data, nt_response.length,
1215                        ntlmssp_state->domain,
1216                        ntlmssp_state->user,
1217                        ntlmssp_state->client.netbios_name,
1218                        encrypted_session_key.data, encrypted_session_key.length,
1219                        ntlmssp_state->neg_flags)) {
1220
1221                 return NT_STATUS_NO_MEMORY;
1222         }
1223
1224         if (DEBUGLEVEL >= 10) {
1225                 struct AUTHENTICATE_MESSAGE *authenticate = talloc(
1226                         talloc_tos(), struct AUTHENTICATE_MESSAGE);
1227                 if (authenticate != NULL) {
1228                         NTSTATUS status;
1229                         authenticate->NegotiateFlags =
1230                                 ntlmssp_state->neg_flags;
1231                         status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
1232                                 next_request, authenticate, authenticate);
1233                         if (NT_STATUS_IS_OK(status)) {
1234                                 NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
1235                                                 authenticate);
1236                         }
1237                         TALLOC_FREE(authenticate);
1238                 }
1239         }
1240
1241         data_blob_free(&encrypted_session_key);
1242
1243         data_blob_free(&ntlmssp_state->chal);
1244
1245         ntlmssp_state->session_key = session_key;
1246
1247         ntlmssp_state->chal = challenge_blob;
1248         ntlmssp_state->lm_resp = lm_response;
1249         ntlmssp_state->nt_resp = nt_response;
1250
1251 done:
1252
1253         ntlmssp_state->expected_state = NTLMSSP_DONE;
1254
1255         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
1256                 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
1257         }
1258
1259         return nt_status;
1260 }
1261
1262 NTSTATUS ntlmssp_client_start(TALLOC_CTX *mem_ctx,
1263                               const char *netbios_name,
1264                               const char *netbios_domain,
1265                               bool use_ntlmv2,
1266                               struct ntlmssp_state **_ntlmssp_state)
1267 {
1268         struct ntlmssp_state *ntlmssp_state;
1269
1270         if (!netbios_name) {
1271                 netbios_name = "";
1272         }
1273
1274         if (!netbios_domain) {
1275                 netbios_domain = "";
1276         }
1277
1278         ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
1279         if (!ntlmssp_state) {
1280                 return NT_STATUS_NO_MEMORY;
1281         }
1282
1283         ntlmssp_state->role = NTLMSSP_CLIENT;
1284
1285         ntlmssp_state->unicode = True;
1286
1287         ntlmssp_state->use_ntlmv2 = use_ntlmv2;
1288
1289         ntlmssp_state->expected_state = NTLMSSP_INITIAL;
1290
1291         ntlmssp_state->neg_flags =
1292                 NTLMSSP_NEGOTIATE_128 |
1293                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
1294                 NTLMSSP_NEGOTIATE_NTLM |
1295                 NTLMSSP_NEGOTIATE_NTLM2 |
1296                 NTLMSSP_NEGOTIATE_KEY_EXCH |
1297                 NTLMSSP_REQUEST_TARGET;
1298
1299         ntlmssp_state->client.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
1300         if (!ntlmssp_state->client.netbios_name) {
1301                 talloc_free(ntlmssp_state);
1302                 return NT_STATUS_NO_MEMORY;
1303         }
1304         ntlmssp_state->client.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
1305         if (!ntlmssp_state->client.netbios_domain) {
1306                 talloc_free(ntlmssp_state);
1307                 return NT_STATUS_NO_MEMORY;
1308         }
1309
1310         *_ntlmssp_state = ntlmssp_state;
1311         return NT_STATUS_OK;
1312 }