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