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  * Determine correct target name flags for reply, given server role
 279  * and negotiated flags
 280  *
 281  * @param ntlmssp_state NTLMSSP State
 282  * @param neg_flags The flags from the packet
 283  * @param chal_flags The flags to be set in the reply packet
 284  * @return The 'target name' string.
 285  */
 286
 287 static const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
 288                                        uint32_t neg_flags, uint32_t *chal_flags)
 289 {
 290         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
 291                 *chal_flags |= NTLMSSP_NEGOTIATE_TARGET_INFO;
 292                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
 293                 if (ntlmssp_state->server.is_standalone) {
 294                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
 295                         return ntlmssp_state->server.netbios_name;
 296                 } else {
 297                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
 298                         return ntlmssp_state->server.netbios_domain;
 299                 };
 300         } else {
 301                 return "";
 302         }
 303 }
 304
 305 static void ntlmssp_handle_neg_flags(struct ntlmssp_state *ntlmssp_state,
 306                                      uint32_t neg_flags, bool allow_lm) {
 307         if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
 308                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 309                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_OEM;
 310                 ntlmssp_state->unicode = True;
 311         } else {
 312                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_UNICODE;
 313                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 314                 ntlmssp_state->unicode = False;
 315         }
 316
 317         if ((neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && allow_lm) {
 318                 /* other end forcing us to use LM */
 319                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
 320                 ntlmssp_state->use_ntlmv2 = False;
 321         } else {
 322                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 323         }
 324
 325         if (!(neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)) {
 326                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 327         }
 328
 329         if (!(neg_flags & NTLMSSP_NEGOTIATE_NTLM2)) {
 330                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 331         }
 332
 333         if (!(neg_flags & NTLMSSP_NEGOTIATE_128)) {
 334                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_128;
 335         }
 336
 337         if (!(neg_flags & NTLMSSP_NEGOTIATE_56)) {
 338                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_56;
 339         }
 340
 341         if (!(neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)) {
 342                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_KEY_EXCH;
 343         }
 344
 345         if (!(neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
 346                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN;
 347         }
 348
 349         if (!(neg_flags & NTLMSSP_NEGOTIATE_SEAL)) {
 350                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SEAL;
 351         }
 352
 353         /* Woop Woop - unknown flag for Windows compatibility...
 354            What does this really do ? JRA. */
 355         if (!(neg_flags & NTLMSSP_NEGOTIATE_VERSION)) {
 356                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_VERSION;
 357         }
 358
 359         if ((neg_flags & NTLMSSP_REQUEST_TARGET)) {
 360                 ntlmssp_state->neg_flags |= NTLMSSP_REQUEST_TARGET;
 361         }
 362 }
 363
 364 /**
 365  * Next state function for the Negotiate packet
 366  *
 367  * @param ntlmssp_state NTLMSSP State
 368  * @param request The request, as a DATA_BLOB
 369  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 370  * @return Errors or MORE_PROCESSING_REQUIRED if a reply is sent.
 371  */
 372
 373 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
 374                                          const DATA_BLOB request, DATA_BLOB *reply)
 375 {
 376         DATA_BLOB struct_blob;
 377         uint32_t neg_flags = 0;
 378         uint32_t ntlmssp_command, chal_flags;
 379         uint8_t cryptkey[8];
 380         const char *target_name;
 381         NTSTATUS status;
 382
 383         /* parse the NTLMSSP packet */
 384 #if 0
 385         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 386 #endif
 387
 388         if (request.length) {
 389                 if ((request.length < 16) || !msrpc_parse(ntlmssp_state, &request, "Cdd",
 390                                                           "NTLMSSP",
 391                                                           &ntlmssp_command,
 392                                                           &neg_flags)) {
 393                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
 394                                 (unsigned int)request.length));
 395                         dump_data(2, request.data, request.length);
 396                         return NT_STATUS_INVALID_PARAMETER;
 397                 }
 398                 debug_ntlmssp_flags(neg_flags);
 399
 400                 if (DEBUGLEVEL >= 10) {
 401                         struct NEGOTIATE_MESSAGE *negotiate = talloc(
 402                                 talloc_tos(), struct NEGOTIATE_MESSAGE);
 403                         if (negotiate != NULL) {
 404                                 status = ntlmssp_pull_NEGOTIATE_MESSAGE(
 405                                         &request, negotiate, negotiate);
 406                                 if (NT_STATUS_IS_OK(status)) {
 407                                         NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
 408                                                         negotiate);
 409                                 }
 410                                 TALLOC_FREE(negotiate);
 411                         }
 412                 }
 413         }
 414
 415         ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, lp_lanman_auth());
 416
 417         /* Ask our caller what challenge they would like in the packet */
 418         status = ntlmssp_state->get_challenge(ntlmssp_state, cryptkey);
 419         if (!NT_STATUS_IS_OK(status)) {
 420                 return status;
 421         }
 422
 423         /* Check if we may set the challenge */
 424         if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
 425                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 426         }
 427
 428         /* The flags we send back are not just the negotiated flags,
 429          * they are also 'what is in this packet'.  Therfore, we
 430          * operate on 'chal_flags' from here on
 431          */
 432
 433         chal_flags = ntlmssp_state->neg_flags;
 434
 435         /* get the right name to fill in as 'target' */
 436         target_name = ntlmssp_target_name(ntlmssp_state,
 437                                           neg_flags, &chal_flags);
 438         if (target_name == NULL)
 439                 return NT_STATUS_INVALID_PARAMETER;
 440
 441         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
 442         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state,
 443                                                         cryptkey, 8);
 444
 445         /* This creates the 'blob' of names that appears at the end of the packet */
 446         if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
 447         {
 448                 msrpc_gen(ntlmssp_state, &struct_blob, "aaaaa",
 449                           MsvAvNbDomainName, target_name,
 450                           MsvAvNbComputerName, ntlmssp_state->server.netbios_name,
 451                           MsvAvDnsDomainName, ntlmssp_state->server.dns_domain,
 452                           MsvAvDnsComputerName, ntlmssp_state->server.dns_name,
 453                           MsvAvEOL, "");
 454         } else {
 455                 struct_blob = data_blob_null;
 456         }
 457
 458         {
 459                 /* Marshal the packet in the right format, be it unicode or ASCII */
 460                 const char *gen_string;
 461                 DATA_BLOB version_blob = data_blob_null;
 462
 463                 if (chal_flags & NTLMSSP_NEGOTIATE_VERSION) {
 464                         enum ndr_err_code err;
 465                         struct VERSION vers;
 466
 467                         /* "What Windows returns" as a version number. */
 468                         ZERO_STRUCT(vers);
 469                         vers.ProductMajorVersion = NTLMSSP_WINDOWS_MAJOR_VERSION_6;
 470                         vers.ProductMinorVersion = NTLMSSP_WINDOWS_MINOR_VERSION_1;
 471                         vers.ProductBuild = 0;
 472                         vers.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
 473
 474                         err = ndr_push_struct_blob(&version_blob,
 475                                                 ntlmssp_state,
 476                                                 &vers,
 477                                                 (ndr_push_flags_fn_t)ndr_push_VERSION);
 478
 479                         if (!NDR_ERR_CODE_IS_SUCCESS(err)) {
 480                                 return NT_STATUS_NO_MEMORY;
 481                         }
 482                 }
 483
 484                 if (ntlmssp_state->unicode) {
 485                         gen_string = "CdUdbddBb";
 486                 } else {
 487                         gen_string = "CdAdbddBb";
 488                 }
 489
 490                 msrpc_gen(ntlmssp_state, reply, gen_string,
 491                         "NTLMSSP",
 492                         NTLMSSP_CHALLENGE,
 493                         target_name,
 494                         chal_flags,
 495                         cryptkey, 8,
 496                         0, 0,
 497                         struct_blob.data, struct_blob.length,
 498                         version_blob.data, version_blob.length);
 499
 500                 data_blob_free(&version_blob);
 501
 502                 if (DEBUGLEVEL >= 10) {
 503                         struct CHALLENGE_MESSAGE *challenge = talloc(
 504                                 talloc_tos(), struct CHALLENGE_MESSAGE);
 505                         if (challenge != NULL) {
 506                                 challenge->NegotiateFlags = chal_flags;
 507                                 status = ntlmssp_pull_CHALLENGE_MESSAGE(
 508                                         reply, challenge, challenge);
 509                                 if (NT_STATUS_IS_OK(status)) {
 510                                         NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
 511                                                         challenge);
 512                                 }
 513                                 TALLOC_FREE(challenge);
 514                         }
 515                 }
 516         }
 517
 518         data_blob_free(&struct_blob);
 519
 520         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 521
 522         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 523 }
 524
 525 /**
 526  * Next state function for the Authenticate packet
 527  *
 528  * @param ntlmssp_state NTLMSSP State
 529  * @param request The request, as a DATA_BLOB
 530  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 531  * @return Errors or NT_STATUS_OK.
 532  */
 533
 534 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
 535                                     const DATA_BLOB request, DATA_BLOB *reply)
 536 {
 537         DATA_BLOB encrypted_session_key = data_blob_null;
 538         DATA_BLOB user_session_key = data_blob_null;
 539         DATA_BLOB lm_session_key = data_blob_null;
 540         DATA_BLOB session_key = data_blob_null;
 541         uint32_t ntlmssp_command, auth_flags;
 542         NTSTATUS nt_status = NT_STATUS_OK;
 543
 544         /* used by NTLM2 */
 545         bool doing_ntlm2 = False;
 546
 547         uint8_t session_nonce[16];
 548         uint8_t session_nonce_hash[16];
 549
 550         const char *parse_string;
 551
 552         /* parse the NTLMSSP packet */
 553         *reply = data_blob_null;
 554
 555 #if 0
 556         file_save("ntlmssp_auth.dat", request.data, request.length);
 557 #endif
 558
 559         if (ntlmssp_state->unicode) {
 560                 parse_string = "CdBBUUUBd";
 561         } else {
 562                 parse_string = "CdBBAAABd";
 563         }
 564
 565         data_blob_free(&ntlmssp_state->lm_resp);
 566         data_blob_free(&ntlmssp_state->nt_resp);
 567
 568         ntlmssp_state->user = NULL;
 569         ntlmssp_state->domain = NULL;
 570
 571         /* now the NTLMSSP encoded auth hashes */
 572         if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 573                          "NTLMSSP",
 574                          &ntlmssp_command,
 575                          &ntlmssp_state->lm_resp,
 576                          &ntlmssp_state->nt_resp,
 577                          &ntlmssp_state->domain,
 578                          &ntlmssp_state->user,
 579                          &ntlmssp_state->client.netbios_name,
 580                          &encrypted_session_key,
 581                          &auth_flags)) {
 582                 auth_flags = 0;
 583
 584                 /* Try again with a shorter string (Win9X truncates this packet) */
 585                 if (ntlmssp_state->unicode) {
 586                         parse_string = "CdBBUUU";
 587                 } else {
 588                         parse_string = "CdBBAAA";
 589                 }
 590
 591                 /* now the NTLMSSP encoded auth hashes */
 592                 if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 593                                  "NTLMSSP",
 594                                  &ntlmssp_command,
 595                                  &ntlmssp_state->lm_resp,
 596                                  &ntlmssp_state->nt_resp,
 597                                  &ntlmssp_state->domain,
 598                                  &ntlmssp_state->user,
 599                                  &ntlmssp_state->client.netbios_name)) {
 600                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
 601                         dump_data(2, request.data, request.length);
 602
 603                         return NT_STATUS_INVALID_PARAMETER;
 604                 }
 605         }
 606
 607         if (auth_flags)
 608                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
 609
 610         if (DEBUGLEVEL >= 10) {
 611                 struct AUTHENTICATE_MESSAGE *authenticate = talloc(
 612                         talloc_tos(), struct AUTHENTICATE_MESSAGE);
 613                 if (authenticate != NULL) {
 614                         NTSTATUS status;
 615                         authenticate->NegotiateFlags = auth_flags;
 616                         status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
 617                                 &request, authenticate, authenticate);
 618                         if (NT_STATUS_IS_OK(status)) {
 619                                 NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
 620                                                 authenticate);
 621                         }
 622                         TALLOC_FREE(authenticate);
 623                 }
 624         }
 625
 626         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 627                  ntlmssp_state->user, ntlmssp_state->domain,
 628                  ntlmssp_state->client.netbios_name,
 629                  (unsigned long)ntlmssp_state->lm_resp.length,
 630                  (unsigned long)ntlmssp_state->nt_resp.length));
 631
 632 #if 0
 633         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 634         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 635 #endif
 636
 637         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 638            client challenge
 639
 640            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 641         */
 642         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 643                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 644                         struct MD5Context md5_session_nonce_ctx;
 645                         SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
 646
 647                         doing_ntlm2 = True;
 648
 649                         memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
 650                         memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 651
 652                         MD5Init(&md5_session_nonce_ctx);
 653                         MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
 654                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 655
 656                         ntlmssp_state->chal = data_blob_talloc(
 657                                 ntlmssp_state, session_nonce_hash, 8);
 658
 659                         /* LM response is no longer useful */
 660                         data_blob_free(&ntlmssp_state->lm_resp);
 661
 662                         /* We changed the effective challenge - set it */
 663                         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
 664                                 data_blob_free(&encrypted_session_key);
 665                                 return nt_status;
 666                         }
 667
 668                         /* LM Key is incompatible. */
 669                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 670                 }
 671         }
 672
 673         /*
 674          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 675          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 676          * smb.conf file) and no NTLMv2 response was sent then the password check
 677          * will fail here. JRA.
 678          */
 679
 680         /* Finally, actually ask if the password is OK */
 681
 682         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
 683                                                                        &user_session_key, &lm_session_key))) {
 684                 data_blob_free(&encrypted_session_key);
 685                 return nt_status;
 686         }
 687
 688         dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
 689         dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
 690
 691         /* Handle the different session key derivation for NTLM2 */
 692         if (doing_ntlm2) {
 693                 if (user_session_key.data && user_session_key.length == 16) {
 694                         session_key = data_blob_talloc(ntlmssp_state,
 695                                                        NULL, 16);
 696                         hmac_md5(user_session_key.data, session_nonce,
 697                                  sizeof(session_nonce), session_key.data);
 698                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 699                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 700
 701                 } else {
 702                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 703                         session_key = data_blob_null;
 704                 }
 705         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
 706                 if (lm_session_key.data && lm_session_key.length >= 8) {
 707                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 708                                 session_key = data_blob_talloc(ntlmssp_state,
 709                                                                NULL, 16);
 710                                 if (session_key.data == NULL) {
 711                                         return NT_STATUS_NO_MEMORY;
 712                                 }
 713                                 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
 714                                                           session_key.data);
 715                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 716                         } else {
 717                                 static const uint8_t zeros[24] = {0, };
 718                                 session_key = data_blob_talloc(
 719                                         ntlmssp_state, NULL, 16);
 720                                 if (session_key.data == NULL) {
 721                                         return NT_STATUS_NO_MEMORY;
 722                                 }
 723                                 SMBsesskeygen_lm_sess_key(
 724                                         lm_session_key.data, zeros,
 725                                         session_key.data);
 726                         }
 727                         dump_data_pw("LM session key:\n", session_key.data,
 728                                      session_key.length);
 729                 } else {
 730                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 731                         session_key = data_blob_null;
 732                 }
 733         } else if (user_session_key.data) {
 734                 session_key = user_session_key;
 735                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 736                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 737         } else if (lm_session_key.data) {
 738                 session_key = lm_session_key;
 739                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 740                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 741         } else {
 742                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 743                 session_key = data_blob_null;
 744         }
 745
 746         /* With KEY_EXCH, the client supplies the proposed session key,
 747            but encrypts it with the long-term key */
 748         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 749                 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
 750                         data_blob_free(&encrypted_session_key);
 751                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 752                                   (unsigned int)encrypted_session_key.length));
 753                         return NT_STATUS_INVALID_PARAMETER;
 754                 } else if (!session_key.data || session_key.length != 16) {
 755                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 756                                   (unsigned int)session_key.length));
 757                         ntlmssp_state->session_key = session_key;
 758                 } else {
 759                         dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
 760                         arcfour_crypt_blob(encrypted_session_key.data,
 761                                            encrypted_session_key.length,
 762                                            &session_key);
 763                         ntlmssp_state->session_key = data_blob_talloc(
 764                                 ntlmssp_state, encrypted_session_key.data,
 765                                 encrypted_session_key.length);
 766                         dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
 767                                      encrypted_session_key.length);
 768                 }
 769         } else {
 770                 ntlmssp_state->session_key = session_key;
 771         }
 772
 773         if (!NT_STATUS_IS_OK(nt_status)) {
 774                 ntlmssp_state->session_key = data_blob_null;
 775         } else if (ntlmssp_state->session_key.length) {
 776                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 777         }
 778
 779         data_blob_free(&encrypted_session_key);
 780
 781         /* Only one authentication allowed per server state. */
 782         ntlmssp_state->expected_state = NTLMSSP_DONE;
 783
 784         return nt_status;
 785 }
 786
 787 /**
 788  * Create an NTLMSSP state machine
 789  *
 790  * @param ntlmssp_state NTLMSSP State, allocated by this function
 791  */
 792
 793 NTSTATUS ntlmssp_server_start(TALLOC_CTX *mem_ctx,
 794                               bool is_standalone,
 795                               const char *netbios_name,
 796                               const char *netbios_domain,
 797                               const char *dns_name,
 798                               const char *dns_domain,
 799                               struct ntlmssp_state **_ntlmssp_state)
 800 {
 801         struct ntlmssp_state *ntlmssp_state;
 802
 803         if (!netbios_name) {
 804                 netbios_name = "";
 805         }
 806
 807         if (!netbios_domain) {
 808                 netbios_domain = "";
 809         }
 810
 811         if (!dns_domain) {
 812                 dns_domain = "";
 813         }
 814
 815         if (!dns_name) {
 816                 dns_name = "";
 817         }
 818
 819         ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
 820         if (!ntlmssp_state) {
 821                 return NT_STATUS_NO_MEMORY;
 822         }
 823
 824         ntlmssp_state->role = NTLMSSP_SERVER;
 825
 826         ntlmssp_state->get_challenge = get_challenge;
 827         ntlmssp_state->set_challenge = set_challenge;
 828         ntlmssp_state->may_set_challenge = may_set_challenge;
 829
 830         ntlmssp_state->server.is_standalone = is_standalone;
 831
 832         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 833
 834         ntlmssp_state->neg_flags =
 835                 NTLMSSP_NEGOTIATE_128 |
 836                 NTLMSSP_NEGOTIATE_56 |
 837                 NTLMSSP_NEGOTIATE_VERSION |
 838                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
 839                 NTLMSSP_NEGOTIATE_NTLM |
 840                 NTLMSSP_NEGOTIATE_NTLM2 |
 841                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 842                 NTLMSSP_NEGOTIATE_SIGN |
 843                 NTLMSSP_NEGOTIATE_SEAL;
 844
 845         ntlmssp_state->server.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
 846         if (!ntlmssp_state->server.netbios_name) {
 847                 talloc_free(ntlmssp_state);
 848                 return NT_STATUS_NO_MEMORY;
 849         }
 850         ntlmssp_state->server.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
 851         if (!ntlmssp_state->server.netbios_domain) {
 852                 talloc_free(ntlmssp_state);
 853                 return NT_STATUS_NO_MEMORY;
 854         }
 855         ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state, dns_name);
 856         if (!ntlmssp_state->server.dns_name) {
 857                 talloc_free(ntlmssp_state);
 858                 return NT_STATUS_NO_MEMORY;
 859         }
 860         ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state, dns_domain);
 861         if (!ntlmssp_state->server.dns_domain) {
 862                 talloc_free(ntlmssp_state);
 863                 return NT_STATUS_NO_MEMORY;
 864         }
 865
 866         *_ntlmssp_state = ntlmssp_state;
 867         return NT_STATUS_OK;
 868 }
 869
 870 /*********************************************************************
 871  Client side NTLMSSP
 872 *********************************************************************/
 873
 874 /**
 875  * Next state function for the Initial packet
 876  *
 877  * @param ntlmssp_state NTLMSSP State
 878  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 879  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 880  * @return Errors or NT_STATUS_OK.
 881  */
 882
 883 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
 884                                   DATA_BLOB reply, DATA_BLOB *next_request)
 885 {
 886         if (ntlmssp_state->unicode) {
 887                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 888         } else {
 889                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 890         }
 891
 892         if (ntlmssp_state->use_ntlmv2) {
 893                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 894         }
 895
 896         /* generate the ntlmssp negotiate packet */
 897         msrpc_gen(ntlmssp_state, next_request, "CddAA",
 898                   "NTLMSSP",
 899                   NTLMSSP_NEGOTIATE,
 900                   ntlmssp_state->neg_flags,
 901                   ntlmssp_state->client.netbios_domain,
 902                   ntlmssp_state->client.netbios_name);
 903
 904         if (DEBUGLEVEL >= 10) {
 905                 struct NEGOTIATE_MESSAGE *negotiate = talloc(
 906                         talloc_tos(), struct NEGOTIATE_MESSAGE);
 907                 if (negotiate != NULL) {
 908                         NTSTATUS status;
 909                         status = ntlmssp_pull_NEGOTIATE_MESSAGE(
 910                                 next_request, negotiate, negotiate);
 911                         if (NT_STATUS_IS_OK(status)) {
 912                                 NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
 913                                                 negotiate);
 914                         }
 915                         TALLOC_FREE(negotiate);
 916                 }
 917         }
 918
 919         ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
 920
 921         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 922 }
 923
 924 /**
 925  * Next state function for the Challenge Packet.  Generate an auth packet.
 926  *
 927  * @param ntlmssp_state NTLMSSP State
 928  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 929  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 930  * @return Errors or NT_STATUS_OK.
 931  */
 932
 933 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
 934                                          const DATA_BLOB reply, DATA_BLOB *next_request)
 935 {
 936         uint32_t chal_flags, ntlmssp_command, unkn1, unkn2;
 937         DATA_BLOB server_domain_blob;
 938         DATA_BLOB challenge_blob;
 939         DATA_BLOB struct_blob = data_blob_null;
 940         char *server_domain;
 941         const char *chal_parse_string;
 942         const char *auth_gen_string;
 943         DATA_BLOB lm_response = data_blob_null;
 944         DATA_BLOB nt_response = data_blob_null;
 945         DATA_BLOB session_key = data_blob_null;
 946         DATA_BLOB encrypted_session_key = data_blob_null;
 947         NTSTATUS nt_status = NT_STATUS_OK;
 948
 949         if (ntlmssp_state->use_ccache) {
 950                 struct wbcCredentialCacheParams params;
 951                 struct wbcCredentialCacheInfo *info = NULL;
 952                 struct wbcAuthErrorInfo *error = NULL;
 953                 struct wbcNamedBlob auth_blob;
 954                 struct wbcBlob *wbc_next = NULL;
 955                 struct wbcBlob *wbc_session_key = NULL;
 956                 wbcErr wbc_status;
 957                 int i;
 958
 959                 params.account_name = ntlmssp_state->user;
 960                 params.domain_name = ntlmssp_state->domain;
 961                 params.level = WBC_CREDENTIAL_CACHE_LEVEL_NTLMSSP;
 962
 963                 auth_blob.name = "challenge_blob";
 964                 auth_blob.flags = 0;
 965                 auth_blob.blob.data = reply.data;
 966                 auth_blob.blob.length = reply.length;
 967                 params.num_blobs = 1;
 968                 params.blobs = &auth_blob;
 969
 970                 wbc_status = wbcCredentialCache(&params, &info, &error);
 971                 if (error != NULL) {
 972                         wbcFreeMemory(error);
 973                 }
 974                 if (!WBC_ERROR_IS_OK(wbc_status)) {
 975                         goto noccache;
 976                 }
 977
 978                 for (i=0; i<info->num_blobs; i++) {
 979                         if (strequal(info->blobs[i].name, "auth_blob")) {
 980                                 wbc_next = &info->blobs[i].blob;
 981                         }
 982                         if (strequal(info->blobs[i].name, "session_key")) {
 983                                 wbc_session_key = &info->blobs[i].blob;
 984                         }
 985                 }
 986                 if ((wbc_next == NULL) || (wbc_session_key == NULL)) {
 987                         wbcFreeMemory(info);
 988                         goto noccache;
 989                 }
 990
 991                 *next_request = data_blob(wbc_next->data, wbc_next->length);
 992                 ntlmssp_state->session_key = data_blob(
 993                         wbc_session_key->data, wbc_session_key->length);
 994
 995                 wbcFreeMemory(info);
 996                 goto done;
 997         }
 998
 999 noccache:
1000
1001         if (!msrpc_parse(ntlmssp_state, &reply, "CdBd",
1002                          "NTLMSSP",
1003                          &ntlmssp_command,
1004                          &server_domain_blob,
1005                          &chal_flags)) {
1006                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
1007                 dump_data(2, reply.data, reply.length);
1008
1009                 return NT_STATUS_INVALID_PARAMETER;
1010         }
1011
1012         if (DEBUGLEVEL >= 10) {
1013                 struct CHALLENGE_MESSAGE *challenge = talloc(
1014                         talloc_tos(), struct CHALLENGE_MESSAGE);
1015                 if (challenge != NULL) {
1016                         NTSTATUS status;
1017                         challenge->NegotiateFlags = chal_flags;
1018                         status = ntlmssp_pull_CHALLENGE_MESSAGE(
1019                                 &reply, challenge, challenge);
1020                         if (NT_STATUS_IS_OK(status)) {
1021                                 NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
1022                                                 challenge);
1023                         }
1024                         TALLOC_FREE(challenge);
1025                 }
1026         }
1027
1028         data_blob_free(&server_domain_blob);
1029
1030         DEBUG(3, ("Got challenge flags:\n"));
1031         debug_ntlmssp_flags(chal_flags);
1032
1033         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
1034
1035         if (ntlmssp_state->unicode) {
1036                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
1037                         chal_parse_string = "CdUdbddB";
1038                 } else {
1039                         chal_parse_string = "CdUdbdd";
1040                 }
1041                 auth_gen_string = "CdBBUUUBd";
1042         } else {
1043                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
1044                         chal_parse_string = "CdAdbddB";
1045                 } else {
1046                         chal_parse_string = "CdAdbdd";
1047                 }
1048
1049                 auth_gen_string = "CdBBAAABd";
1050         }
1051
1052         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
1053         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
1054
1055         if (!msrpc_parse(ntlmssp_state, &reply, chal_parse_string,
1056                          "NTLMSSP",
1057                          &ntlmssp_command,
1058                          &server_domain,
1059                          &chal_flags,
1060                          &challenge_blob, 8,
1061                          &unkn1, &unkn2,
1062                          &struct_blob)) {
1063                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
1064                 dump_data(2, reply.data, reply.length);
1065                 return NT_STATUS_INVALID_PARAMETER;
1066         }
1067
1068         if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
1069                 ntlmssp_state->server.is_standalone = true;
1070         } else {
1071                 ntlmssp_state->server.is_standalone = false;
1072         }
1073         /* TODO: parse struct_blob and fill in the rest */
1074         ntlmssp_state->server.netbios_name = "";
1075         ntlmssp_state->server.netbios_domain = server_domain;
1076         ntlmssp_state->server.dns_name = "";
1077         ntlmssp_state->server.dns_domain = "";
1078
1079         if (challenge_blob.length != 8) {
1080                 data_blob_free(&struct_blob);
1081                 return NT_STATUS_INVALID_PARAMETER;
1082         }
1083
1084         if (!ntlmssp_state->nt_hash || !ntlmssp_state->lm_hash) {
1085                 static const uint8_t zeros[16] = {0, };
1086                 /* do nothing - blobs are zero length */
1087
1088                 /* session key is all zeros */
1089                 session_key = data_blob_talloc(ntlmssp_state, zeros, 16);
1090
1091                 /* not doing NLTM2 without a password */
1092                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
1093         } else if (ntlmssp_state->use_ntlmv2) {
1094                 if (!struct_blob.length) {
1095                         /* be lazy, match win2k - we can't do NTLMv2 without it */
1096                         DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
1097                         return NT_STATUS_INVALID_PARAMETER;
1098                 }
1099
1100                 /* TODO: if the remote server is standalone, then we should replace 'domain'
1101                    with the server name as supplied above */
1102
1103                 if (!SMBNTLMv2encrypt_hash(ntlmssp_state,
1104                                            ntlmssp_state->user,
1105                                            ntlmssp_state->domain,
1106                                            ntlmssp_state->nt_hash, &challenge_blob,
1107                                            &struct_blob,
1108                                            &lm_response, &nt_response, NULL,
1109                                            &session_key)) {
1110                         data_blob_free(&challenge_blob);
1111                         data_blob_free(&struct_blob);
1112                         return NT_STATUS_NO_MEMORY;
1113                 }
1114         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
1115                 struct MD5Context md5_session_nonce_ctx;
1116                 uint8_t session_nonce[16];
1117                 uint8_t session_nonce_hash[16];
1118                 uint8_t user_session_key[16];
1119
1120                 lm_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1121                 generate_random_buffer(lm_response.data, 8);
1122                 memset(lm_response.data+8, 0, 16);
1123
1124                 memcpy(session_nonce, challenge_blob.data, 8);
1125                 memcpy(&session_nonce[8], lm_response.data, 8);
1126
1127                 MD5Init(&md5_session_nonce_ctx);
1128                 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
1129                 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
1130                 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
1131
1132                 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
1133                 DEBUG(5, ("challenge is: \n"));
1134                 dump_data(5, session_nonce_hash, 8);
1135
1136                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1137                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,
1138                                   session_nonce_hash,
1139                                   nt_response.data);
1140
1141                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
1142
1143                 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, user_session_key);
1144                 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
1145                 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
1146         } else {
1147                 /* lanman auth is insecure, it may be disabled */
1148                 if (lp_client_lanman_auth()) {
1149                         lm_response = data_blob_talloc(ntlmssp_state,
1150                                                        NULL, 24);
1151                         SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
1152                                    lm_response.data);
1153                 }
1154
1155                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1156                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
1157                              nt_response.data);
1158
1159                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
1160                 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
1161                     && lp_client_lanman_auth()) {
1162                         SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
1163                                         session_key.data);
1164                         dump_data_pw("LM session key\n", session_key.data, session_key.length);
1165                 } else {
1166                         SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, session_key.data);
1167                         dump_data_pw("NT session key:\n", session_key.data, session_key.length);
1168                 }
1169         }
1170         data_blob_free(&struct_blob);
1171
1172         /* Key exchange encryptes a new client-generated session key with
1173            the password-derived key */
1174         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
1175                 /* Make up a new session key */
1176                 uint8_t client_session_key[16];
1177                 generate_random_buffer(client_session_key, sizeof(client_session_key));
1178
1179                 /* Encrypt the new session key with the old one */
1180                 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
1181                 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
1182                 arcfour_crypt_blob(encrypted_session_key.data, encrypted_session_key.length, &session_key);
1183                 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
1184
1185                 /* Mark the new session key as the 'real' session key */
1186                 data_blob_free(&session_key);
1187                 session_key = data_blob_talloc(ntlmssp_state,
1188                                                client_session_key,
1189                                                sizeof(client_session_key));
1190         }
1191
1192         /* this generates the actual auth packet */
1193         if (!msrpc_gen(ntlmssp_state, next_request, auth_gen_string,
1194                        "NTLMSSP",
1195                        NTLMSSP_AUTH,
1196                        lm_response.data, lm_response.length,
1197                        nt_response.data, nt_response.length,
1198                        ntlmssp_state->domain,
1199                        ntlmssp_state->user,
1200                        ntlmssp_state->client.netbios_name,
1201                        encrypted_session_key.data, encrypted_session_key.length,
1202                        ntlmssp_state->neg_flags)) {
1203
1204                 return NT_STATUS_NO_MEMORY;
1205         }
1206
1207         if (DEBUGLEVEL >= 10) {
1208                 struct AUTHENTICATE_MESSAGE *authenticate = talloc(
1209                         talloc_tos(), struct AUTHENTICATE_MESSAGE);
1210                 if (authenticate != NULL) {
1211                         NTSTATUS status;
1212                         authenticate->NegotiateFlags =
1213                                 ntlmssp_state->neg_flags;
1214                         status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
1215                                 next_request, authenticate, authenticate);
1216                         if (NT_STATUS_IS_OK(status)) {
1217                                 NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
1218                                                 authenticate);
1219                         }
1220                         TALLOC_FREE(authenticate);
1221                 }
1222         }
1223
1224         data_blob_free(&encrypted_session_key);
1225
1226         data_blob_free(&ntlmssp_state->chal);
1227
1228         ntlmssp_state->session_key = session_key;
1229
1230         ntlmssp_state->chal = challenge_blob;
1231         ntlmssp_state->lm_resp = lm_response;
1232         ntlmssp_state->nt_resp = nt_response;
1233
1234 done:
1235
1236         ntlmssp_state->expected_state = NTLMSSP_DONE;
1237
1238         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
1239                 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
1240         }
1241
1242         return nt_status;
1243 }
1244
1245 NTSTATUS ntlmssp_client_start(TALLOC_CTX *mem_ctx,
1246                               const char *netbios_name,
1247                               const char *netbios_domain,
1248                               bool use_ntlmv2,
1249                               struct ntlmssp_state **_ntlmssp_state)
1250 {
1251         struct ntlmssp_state *ntlmssp_state;
1252
1253         if (!netbios_name) {
1254                 netbios_name = "";
1255         }
1256
1257         if (!netbios_domain) {
1258                 netbios_domain = "";
1259         }
1260
1261         ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
1262         if (!ntlmssp_state) {
1263                 return NT_STATUS_NO_MEMORY;
1264         }
1265
1266         ntlmssp_state->role = NTLMSSP_CLIENT;
1267
1268         ntlmssp_state->unicode = True;
1269
1270         ntlmssp_state->use_ntlmv2 = use_ntlmv2;
1271
1272         ntlmssp_state->expected_state = NTLMSSP_INITIAL;
1273
1274         ntlmssp_state->neg_flags =
1275                 NTLMSSP_NEGOTIATE_128 |
1276                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
1277                 NTLMSSP_NEGOTIATE_NTLM |
1278                 NTLMSSP_NEGOTIATE_NTLM2 |
1279                 NTLMSSP_NEGOTIATE_KEY_EXCH |
1280                 NTLMSSP_REQUEST_TARGET;
1281
1282         ntlmssp_state->client.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
1283         if (!ntlmssp_state->client.netbios_name) {
1284                 talloc_free(ntlmssp_state);
1285                 return NT_STATUS_NO_MEMORY;
1286         }
1287         ntlmssp_state->client.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
1288         if (!ntlmssp_state->client.netbios_domain) {
1289                 talloc_free(ntlmssp_state);
1290                 return NT_STATUS_NO_MEMORY;
1291         }
1292
1293         *_ntlmssp_state = ntlmssp_state;
1294         return NT_STATUS_OK;
1295 }