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