source/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 2 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, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "includes.h"
  26
  27 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
  28                                        DATA_BLOB reply, DATA_BLOB *next_request);
  29 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
  30                                          const DATA_BLOB in, DATA_BLOB *out);
  31 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
  32                                          const DATA_BLOB reply, DATA_BLOB *next_request);
  33 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
  34                                     const DATA_BLOB request, DATA_BLOB *reply);
  35
  36 /**
  37  * Callbacks for NTLMSSP - for both client and server operating modes
  38  *
  39  */
  40
  41 static const struct ntlmssp_callbacks {
  42         enum NTLMSSP_ROLE role;
  43         enum NTLM_MESSAGE_TYPE ntlmssp_command;
  44         NTSTATUS (*fn)(struct ntlmssp_state *ntlmssp_state,
  45                        DATA_BLOB in, DATA_BLOB *out);
  46 } ntlmssp_callbacks[] = {
  47         {NTLMSSP_CLIENT, NTLMSSP_INITIAL, ntlmssp_client_initial},
  48         {NTLMSSP_SERVER, NTLMSSP_NEGOTIATE, ntlmssp_server_negotiate},
  49         {NTLMSSP_CLIENT, NTLMSSP_CHALLENGE, ntlmssp_client_challenge},
  50         {NTLMSSP_SERVER, NTLMSSP_AUTH, ntlmssp_server_auth},
  51         {NTLMSSP_CLIENT, NTLMSSP_UNKNOWN, NULL},
  52         {NTLMSSP_SERVER, NTLMSSP_UNKNOWN, NULL}
  53 };
  54
  55
  56 /**
  57  * Print out the NTLMSSP flags for debugging
  58  * @param neg_flags The flags from the packet
  59  */
  60
  61 void debug_ntlmssp_flags(uint32 neg_flags)
  62 {
  63         DEBUG(3,("Got NTLMSSP neg_flags=0x%08x\n", neg_flags));
  64
  65         if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE)
  66                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_UNICODE\n"));
  67         if (neg_flags & NTLMSSP_NEGOTIATE_OEM)
  68                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_OEM\n"));
  69         if (neg_flags & NTLMSSP_REQUEST_TARGET)
  70                 DEBUGADD(4, ("  NTLMSSP_REQUEST_TARGET\n"));
  71         if (neg_flags & NTLMSSP_NEGOTIATE_SIGN)
  72                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_SIGN\n"));
  73         if (neg_flags & NTLMSSP_NEGOTIATE_SEAL)
  74                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_SEAL\n"));
  75         if (neg_flags & NTLMSSP_NEGOTIATE_DATAGRAM_STYLE)
  76                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_DATAGRAM_STYLE\n"));
  77         if (neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
  78                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_LM_KEY\n"));
  79         if (neg_flags & NTLMSSP_NEGOTIATE_NETWARE)
  80                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_NETWARE\n"));
  81         if (neg_flags & NTLMSSP_NEGOTIATE_NTLM)
  82                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_NTLM\n"));
  83         if (neg_flags & NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED)
  84                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED\n"));
  85         if (neg_flags & NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED)
  86                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED\n"));
  87         if (neg_flags & NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL)
  88                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL\n"));
  89         if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
  90                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_ALWAYS_SIGN\n"));
  91         if (neg_flags & NTLMSSP_CHAL_ACCEPT_RESPONSE)
  92                 DEBUGADD(4, ("  NTLMSSP_CHAL_ACCEPT_RESPONSE\n"));
  93         if (neg_flags & NTLMSSP_CHAL_NON_NT_SESSION_KEY)
  94                 DEBUGADD(4, ("  NTLMSSP_CHAL_NON_NT_SESSION_KEY\n"));
  95         if (neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
  96                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_NTLM2\n"));
  97         if (neg_flags & NTLMSSP_CHAL_TARGET_INFO)
  98                 DEBUGADD(4, ("  NTLMSSP_CHAL_TARGET_INFO\n"));
  99         if (neg_flags & NTLMSSP_NEGOTIATE_128)
 100                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_128\n"));
 101         if (neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)
 102                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_KEY_EXCH\n"));
 103         if (neg_flags & NTLMSSP_NEGOTIATE_56)
 104                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_56\n"));
 105 }
 106
 107 /**
 108  * Default challenge generation code.
 109  *
 110  */
 111
 112 static const uint8 *get_challenge(const struct ntlmssp_state *ntlmssp_state)
 113 {
 114         static uchar chal[8];
 115         generate_random_buffer(chal, sizeof(chal));
 116
 117         return chal;
 118 }
 119
 120 /**
 121  * Default 'we can set the challenge to anything we like' implementation
 122  *
 123  */
 124
 125 static BOOL may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
 126 {
 127         return True;
 128 }
 129
 130 /**
 131  * Default 'we can set the challenge to anything we like' implementation
 132  *
 133  * Does not actually do anything, as the value is always in the structure anyway.
 134  *
 135  */
 136
 137 static NTSTATUS set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
 138 {
 139         SMB_ASSERT(challenge->length == 8);
 140         return NT_STATUS_OK;
 141 }
 142
 143 /**
 144  * Set a username on an NTLMSSP context - ensures it is talloc()ed
 145  *
 146  */
 147
 148 NTSTATUS ntlmssp_set_username(NTLMSSP_STATE *ntlmssp_state, const char *user)
 149 {
 150         ntlmssp_state->user = talloc_strdup(ntlmssp_state->mem_ctx, user ? user : "" );
 151         if (!ntlmssp_state->user) {
 152                 return NT_STATUS_NO_MEMORY;
 153         }
 154         return NT_STATUS_OK;
 155 }
 156
 157 /**
 158  * Set a password on an NTLMSSP context - ensures it is talloc()ed
 159  *
 160  */
 161 NTSTATUS ntlmssp_set_password(NTLMSSP_STATE *ntlmssp_state, const char *password)
 162 {
 163         if (!password) {
 164                 ntlmssp_state->password = NULL;
 165         } else {
 166                 ntlmssp_state->password = talloc_strdup(ntlmssp_state->mem_ctx, password);
 167                 if (!ntlmssp_state->password) {
 168                         return NT_STATUS_NO_MEMORY;
 169                 }
 170         }
 171         return NT_STATUS_OK;
 172 }
 173
 174 /**
 175  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
 176  *
 177  */
 178 NTSTATUS ntlmssp_set_domain(NTLMSSP_STATE *ntlmssp_state, const char *domain)
 179 {
 180         ntlmssp_state->domain = talloc_strdup(ntlmssp_state->mem_ctx, domain ? domain : "" );
 181         if (!ntlmssp_state->domain) {
 182                 return NT_STATUS_NO_MEMORY;
 183         }
 184         return NT_STATUS_OK;
 185 }
 186
 187 /**
 188  * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
 189  *
 190  */
 191 NTSTATUS ntlmssp_set_workstation(NTLMSSP_STATE *ntlmssp_state, const char *workstation)
 192 {
 193         ntlmssp_state->workstation = talloc_strdup(ntlmssp_state->mem_ctx, workstation);
 194         if (!ntlmssp_state->workstation) {
 195                 return NT_STATUS_NO_MEMORY;
 196         }
 197         return NT_STATUS_OK;
 198 }
 199
 200 /**
 201  *  Store a DATA_BLOB containing an NTLMSSP response, for use later.
 202  *  This copies the data blob
 203  */
 204
 205 NTSTATUS ntlmssp_store_response(NTLMSSP_STATE *ntlmssp_state,
 206                                 DATA_BLOB response)
 207 {
 208         ntlmssp_state->stored_response = data_blob_talloc(ntlmssp_state->mem_ctx,
 209                                                           response.data, response.length);
 210         return NT_STATUS_OK;
 211 }
 212
 213 /**
 214  * Next state function for the NTLMSSP state machine
 215  *
 216  * @param ntlmssp_state NTLMSSP State
 217  * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
 218  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 219  * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
 220  */
 221
 222 NTSTATUS ntlmssp_update(NTLMSSP_STATE *ntlmssp_state,
 223                         const DATA_BLOB in, DATA_BLOB *out)
 224 {
 225         DATA_BLOB input;
 226         uint32 ntlmssp_command;
 227         int i;
 228
 229         if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
 230                 /* Called update after negotiations finished. */
 231                 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
 232                 return NT_STATUS_INVALID_PARAMETER;
 233         }
 234
 235         *out = data_blob(NULL, 0);
 236
 237         if (!in.length && ntlmssp_state->stored_response.length) {
 238                 input = ntlmssp_state->stored_response;
 239
 240                 /* we only want to read the stored response once - overwrite it */
 241                 ntlmssp_state->stored_response = data_blob(NULL, 0);
 242         } else {
 243                 input = in;
 244         }
 245
 246         if (!input.length) {
 247                 switch (ntlmssp_state->role) {
 248                 case NTLMSSP_CLIENT:
 249                         ntlmssp_command = NTLMSSP_INITIAL;
 250                         break;
 251                 case NTLMSSP_SERVER:
 252                         /* 'datagram' mode - no neg packet */
 253                         ntlmssp_command = NTLMSSP_NEGOTIATE;
 254                         break;
 255                 }
 256         } else {
 257                 if (!msrpc_parse(&input, "Cd",
 258                                  "NTLMSSP",
 259                                  &ntlmssp_command)) {
 260                         DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
 261                         dump_data(2, (const char *)input.data, input.length);
 262                         return NT_STATUS_INVALID_PARAMETER;
 263                 }
 264         }
 265
 266         if (ntlmssp_command != ntlmssp_state->expected_state) {
 267                 DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
 268                 return NT_STATUS_INVALID_PARAMETER;
 269         }
 270
 271         for (i=0; ntlmssp_callbacks[i].fn; i++) {
 272                 if (ntlmssp_callbacks[i].role == ntlmssp_state->role
 273                     && ntlmssp_callbacks[i].ntlmssp_command == ntlmssp_command) {
 274                         return ntlmssp_callbacks[i].fn(ntlmssp_state, input, out);
 275                 }
 276         }
 277
 278         DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
 279                   ntlmssp_state->role, ntlmssp_command));
 280
 281         return NT_STATUS_INVALID_PARAMETER;
 282 }
 283
 284 /**
 285  * End an NTLMSSP state machine
 286  *
 287  * @param ntlmssp_state NTLMSSP State, free()ed by this function
 288  */
 289
 290 void ntlmssp_end(NTLMSSP_STATE **ntlmssp_state)
 291 {
 292         TALLOC_CTX *mem_ctx = (*ntlmssp_state)->mem_ctx;
 293
 294         (*ntlmssp_state)->ref_count--;
 295
 296         if ((*ntlmssp_state)->ref_count == 0) {
 297                 data_blob_free(&(*ntlmssp_state)->chal);
 298                 data_blob_free(&(*ntlmssp_state)->lm_resp);
 299                 data_blob_free(&(*ntlmssp_state)->nt_resp);
 300
 301                 talloc_destroy(mem_ctx);
 302         }
 303
 304         *ntlmssp_state = NULL;
 305         return;
 306 }
 307
 308 /**
 309  * Determine correct target name flags for reply, given server role
 310  * and negotiated flags
 311  *
 312  * @param ntlmssp_state NTLMSSP State
 313  * @param neg_flags The flags from the packet
 314  * @param chal_flags The flags to be set in the reply packet
 315  * @return The 'target name' string.
 316  */
 317
 318 static const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
 319                                        uint32 neg_flags, uint32 *chal_flags)
 320 {
 321         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
 322                 *chal_flags |= NTLMSSP_CHAL_TARGET_INFO;
 323                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
 324                 if (ntlmssp_state->server_role == ROLE_STANDALONE) {
 325                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
 326                         return ntlmssp_state->get_global_myname();
 327                 } else {
 328                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
 329                         return ntlmssp_state->get_domain();
 330                 };
 331         } else {
 332                 return "";
 333         }
 334 }
 335
 336 static void ntlmssp_handle_neg_flags(struct ntlmssp_state *ntlmssp_state,
 337                                       uint32 neg_flags, BOOL allow_lm) {
 338         if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
 339                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 340                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_OEM;
 341                 ntlmssp_state->unicode = True;
 342         } else {
 343                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_UNICODE;
 344                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 345                 ntlmssp_state->unicode = False;
 346         }
 347
 348         if ((neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && allow_lm) {
 349                 /* other end forcing us to use LM */
 350                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
 351                 ntlmssp_state->use_ntlmv2 = False;
 352         } else {
 353                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 354         }
 355
 356         if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN) {
 357                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 358         }
 359
 360         if (!(neg_flags & NTLMSSP_NEGOTIATE_NTLM2)) {
 361                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 362         }
 363
 364         if (!(neg_flags & NTLMSSP_NEGOTIATE_128)) {
 365                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_128;
 366                 if (neg_flags & NTLMSSP_NEGOTIATE_56) {
 367                         ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 368                 }
 369         }
 370
 371         if (!(neg_flags & NTLMSSP_NEGOTIATE_56)) {
 372                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_56;
 373         }
 374
 375         if (!(neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)) {
 376                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_KEY_EXCH;
 377         }
 378
 379         if ((neg_flags & NTLMSSP_REQUEST_TARGET)) {
 380                 ntlmssp_state->neg_flags |= NTLMSSP_REQUEST_TARGET;
 381         }
 382
 383 }
 384
 385 /**
 386  Weaken NTLMSSP keys to cope with down-level clients and servers.
 387
 388  We probably should have some parameters to control this, but as
 389  it only occours for LM_KEY connections, and this is controlled
 390  by the client lanman auth/lanman auth parameters, it isn't too bad.
 391 */
 392
 393 DATA_BLOB ntlmssp_weaken_keys(NTLMSSP_STATE *ntlmssp_state, TALLOC_CTX *mem_ctx)
 394 {
 395         DATA_BLOB weakened_key = data_blob_talloc(mem_ctx,
 396                                         ntlmssp_state->session_key.data,
 397                                         ntlmssp_state->session_key.length);
 398
 399         /* Nothing to weaken.  We certainly don't want to 'extend' the length... */
 400         if (weakened_key.length < 16) {
 401                 /* perhaps there was no key? */
 402                 return weakened_key;
 403         }
 404
 405         /* Key weakening not performed on the master key for NTLM2
 406            and does not occour for NTLM1.  Therefore we only need
 407            to do this for the LM_KEY.
 408         */
 409
 410         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
 411                 /* LM key doesn't support 128 bit crypto, so this is
 412                  * the best we can do.  If you negotiate 128 bit, but
 413                  * not 56, you end up with 40 bit... */
 414                 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
 415                         weakened_key.data[7] = 0xa0;
 416                 } else { /* forty bits */
 417                         weakened_key.data[5] = 0xe5;
 418                         weakened_key.data[6] = 0x38;
 419                         weakened_key.data[7] = 0xb0;
 420                 }
 421                 weakened_key.length = 8;
 422         }
 423         return weakened_key;
 424 }
 425
 426 /**
 427  * Next state function for the Negotiate packet
 428  *
 429  * @param ntlmssp_state NTLMSSP State
 430  * @param request The request, as a DATA_BLOB
 431  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 432  * @return Errors or MORE_PROCESSING_REQUIRED if a reply is sent.
 433  */
 434
 435 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
 436                                          const DATA_BLOB request, DATA_BLOB *reply)
 437 {
 438         DATA_BLOB struct_blob;
 439         fstring dnsname, dnsdomname;
 440         uint32 neg_flags = 0;
 441         uint32 ntlmssp_command, chal_flags;
 442         const uint8 *cryptkey;
 443         const char *target_name;
 444
 445         /* parse the NTLMSSP packet */
 446 #if 0
 447         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 448 #endif
 449
 450         if (request.length) {
 451                 if ((request.length < 16) || !msrpc_parse(&request, "Cdd",
 452                                                         "NTLMSSP",
 453                                                         &ntlmssp_command,
 454                                                         &neg_flags)) {
 455                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
 456                                 (unsigned int)request.length));
 457                         dump_data(2, (const char *)request.data, request.length);
 458                         return NT_STATUS_INVALID_PARAMETER;
 459                 }
 460                 debug_ntlmssp_flags(neg_flags);
 461         }
 462
 463         ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, lp_lanman_auth());
 464
 465         /* Ask our caller what challenge they would like in the packet */
 466         cryptkey = ntlmssp_state->get_challenge(ntlmssp_state);
 467
 468         /* Check if we may set the challenge */
 469         if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
 470                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 471         }
 472
 473         /* The flags we send back are not just the negotiated flags,
 474          * they are also 'what is in this packet'.  Therfore, we
 475          * operate on 'chal_flags' from here on
 476          */
 477
 478         chal_flags = ntlmssp_state->neg_flags;
 479
 480         /* get the right name to fill in as 'target' */
 481         target_name = ntlmssp_target_name(ntlmssp_state,
 482                                           neg_flags, &chal_flags);
 483         if (target_name == NULL)
 484                 return NT_STATUS_INVALID_PARAMETER;
 485
 486         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, cryptkey, 8);
 487         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state->mem_ctx, cryptkey, 8);
 488
 489
 490         /* This should be a 'netbios domain -> DNS domain' mapping */
 491         dnsdomname[0] = '\0';
 492         get_mydnsdomname(dnsdomname);
 493         strlower_m(dnsdomname);
 494
 495         dnsname[0] = '\0';
 496         get_mydnsfullname(dnsname);
 497
 498         /* This creates the 'blob' of names that appears at the end of the packet */
 499         if (chal_flags & NTLMSSP_CHAL_TARGET_INFO)
 500         {
 501                 msrpc_gen(&struct_blob, "aaaaa",
 502                           NTLMSSP_NAME_TYPE_DOMAIN, target_name,
 503                           NTLMSSP_NAME_TYPE_SERVER, ntlmssp_state->get_global_myname(),
 504                           NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
 505                           NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
 506                           0, "");
 507         } else {
 508                 struct_blob = data_blob(NULL, 0);
 509         }
 510
 511         {
 512                 /* Marshel the packet in the right format, be it unicode or ASCII */
 513                 const char *gen_string;
 514                 if (ntlmssp_state->unicode) {
 515                         gen_string = "CdUdbddB";
 516                 } else {
 517                         gen_string = "CdAdbddB";
 518                 }
 519
 520                 msrpc_gen(reply, gen_string,
 521                           "NTLMSSP",
 522                           NTLMSSP_CHALLENGE,
 523                           target_name,
 524                           chal_flags,
 525                           cryptkey, 8,
 526                           0, 0,
 527                           struct_blob.data, struct_blob.length);
 528         }
 529
 530         data_blob_free(&struct_blob);
 531
 532         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 533
 534         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 535 }
 536
 537 /**
 538  * Next state function for the Authenticate packet
 539  *
 540  * @param ntlmssp_state NTLMSSP State
 541  * @param request The request, as a DATA_BLOB
 542  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 543  * @return Errors or NT_STATUS_OK.
 544  */
 545
 546 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
 547                                     const DATA_BLOB request, DATA_BLOB *reply)
 548 {
 549         DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
 550         DATA_BLOB user_session_key = data_blob(NULL, 0);
 551         DATA_BLOB lm_session_key = data_blob(NULL, 0);
 552         DATA_BLOB session_key = data_blob(NULL, 0);
 553         uint32 ntlmssp_command, auth_flags;
 554         NTSTATUS nt_status = NT_STATUS_OK;
 555
 556         /* used by NTLM2 */
 557         BOOL doing_ntlm2 = False;
 558
 559         uchar session_nonce[16];
 560         uchar session_nonce_hash[16];
 561
 562         const char *parse_string;
 563         char *domain = NULL;
 564         char *user = NULL;
 565         char *workstation = NULL;
 566
 567         /* parse the NTLMSSP packet */
 568         *reply = data_blob(NULL, 0);
 569
 570 #if 0
 571         file_save("ntlmssp_auth.dat", request.data, request.length);
 572 #endif
 573
 574         if (ntlmssp_state->unicode) {
 575                 parse_string = "CdBBUUUBd";
 576         } else {
 577                 parse_string = "CdBBAAABd";
 578         }
 579
 580         data_blob_free(&ntlmssp_state->lm_resp);
 581         data_blob_free(&ntlmssp_state->nt_resp);
 582
 583         ntlmssp_state->user = NULL;
 584         ntlmssp_state->domain = NULL;
 585         ntlmssp_state->workstation = NULL;
 586
 587         /* now the NTLMSSP encoded auth hashes */
 588         if (!msrpc_parse(&request, parse_string,
 589                          "NTLMSSP",
 590                          &ntlmssp_command,
 591                          &ntlmssp_state->lm_resp,
 592                          &ntlmssp_state->nt_resp,
 593                          &domain,
 594                          &user,
 595                          &workstation,
 596                          &encrypted_session_key,
 597                          &auth_flags)) {
 598                 SAFE_FREE(domain);
 599                 SAFE_FREE(user);
 600                 SAFE_FREE(workstation);
 601                 data_blob_free(&encrypted_session_key);
 602                 auth_flags = 0;
 603
 604                 /* Try again with a shorter string (Win9X truncates this packet) */
 605                 if (ntlmssp_state->unicode) {
 606                         parse_string = "CdBBUUU";
 607                 } else {
 608                         parse_string = "CdBBAAA";
 609                 }
 610
 611                 /* now the NTLMSSP encoded auth hashes */
 612                 if (!msrpc_parse(&request, parse_string,
 613                                  "NTLMSSP",
 614                                  &ntlmssp_command,
 615                                  &ntlmssp_state->lm_resp,
 616                                  &ntlmssp_state->nt_resp,
 617                                  &domain,
 618                                  &user,
 619                                  &workstation)) {
 620                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
 621                         dump_data(2, (const char *)request.data, request.length);
 622                         SAFE_FREE(domain);
 623                         SAFE_FREE(user);
 624                         SAFE_FREE(workstation);
 625
 626                         return NT_STATUS_INVALID_PARAMETER;
 627                 }
 628         }
 629
 630         if (auth_flags)
 631                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
 632
 633         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, domain))) {
 634                 SAFE_FREE(domain);
 635                 SAFE_FREE(user);
 636                 SAFE_FREE(workstation);
 637                 data_blob_free(&encrypted_session_key);
 638                 return nt_status;
 639         }
 640
 641         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(ntlmssp_state, user))) {
 642                 SAFE_FREE(domain);
 643                 SAFE_FREE(user);
 644                 SAFE_FREE(workstation);
 645                 data_blob_free(&encrypted_session_key);
 646                 return nt_status;
 647         }
 648
 649         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(ntlmssp_state, workstation))) {
 650                 SAFE_FREE(domain);
 651                 SAFE_FREE(user);
 652                 SAFE_FREE(workstation);
 653                 data_blob_free(&encrypted_session_key);
 654                 return nt_status;
 655         }
 656
 657         SAFE_FREE(domain);
 658         SAFE_FREE(user);
 659         SAFE_FREE(workstation);
 660
 661         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 662                  ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
 663
 664 #if 0
 665         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 666         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 667 #endif
 668
 669         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 670            client challenge
 671
 672            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 673         */
 674         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 675                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 676                         struct MD5Context md5_session_nonce_ctx;
 677                         SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
 678
 679                         doing_ntlm2 = True;
 680
 681                         memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
 682                         memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 683
 684                         MD5Init(&md5_session_nonce_ctx);
 685                         MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
 686                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 687
 688                         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, session_nonce_hash, 8);
 689
 690                         /* LM response is no longer useful */
 691                         data_blob_free(&ntlmssp_state->lm_resp);
 692
 693                         /* We changed the effective challenge - set it */
 694                         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
 695                                 data_blob_free(&encrypted_session_key);
 696                                 return nt_status;
 697                         }
 698
 699                         /* LM Key is incompatible. */
 700                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 701                 }
 702         }
 703
 704         /*
 705          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 706          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 707          * smb.conf file) and no NTLMv2 response was sent then the password check
 708          * will fail here. JRA.
 709          */
 710
 711         /* Finally, actually ask if the password is OK */
 712
 713         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
 714                                                                        &user_session_key, &lm_session_key))) {
 715                 data_blob_free(&encrypted_session_key);
 716                 return nt_status;
 717         }
 718
 719         dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
 720         dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
 721
 722         /* Handle the different session key derivation for NTLM2 */
 723         if (doing_ntlm2) {
 724                 if (user_session_key.data && user_session_key.length == 16) {
 725                         session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
 726                         hmac_md5(user_session_key.data, session_nonce,
 727                                  sizeof(session_nonce), session_key.data);
 728                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 729                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 730
 731                 } else {
 732                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 733                         session_key = data_blob(NULL, 0);
 734                 }
 735         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
 736                 if (lm_session_key.data && lm_session_key.length >= 8) {
 737                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 738                                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
 739                                 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
 740                                                           session_key.data);
 741                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 742                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 743                         } else {
 744                                 /* use the key unmodified - it's
 745                                  * probably a NULL key from the guest
 746                                  * login */
 747                                 session_key = lm_session_key;
 748                         }
 749                 } else {
 750                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 751                         session_key = data_blob(NULL, 0);
 752                 }
 753         } else if (user_session_key.data) {
 754                 session_key = user_session_key;
 755                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 756                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 757         } else if (lm_session_key.data) {
 758                 session_key = lm_session_key;
 759                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 760                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 761         } else {
 762                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 763                 session_key = data_blob(NULL, 0);
 764         }
 765
 766         /* With KEY_EXCH, the client supplies the proposed session key,
 767            but encrypts it with the long-term key */
 768         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 769                 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
 770                         data_blob_free(&encrypted_session_key);
 771                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 772                                   (unsigned int)encrypted_session_key.length));
 773                         return NT_STATUS_INVALID_PARAMETER;
 774                 } else if (!session_key.data || session_key.length != 16) {
 775                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 776                                   (unsigned int)session_key.length));
 777                         ntlmssp_state->session_key = session_key;
 778                 } else {
 779                         dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
 780                         SamOEMhash(encrypted_session_key.data,
 781                                    session_key.data,
 782                                    encrypted_session_key.length);
 783                         ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state->mem_ctx,
 784                                                                       encrypted_session_key.data,
 785                                                                       encrypted_session_key.length);
 786                         dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
 787                                      encrypted_session_key.length);
 788                 }
 789         } else {
 790                 ntlmssp_state->session_key = session_key;
 791         }
 792
 793         if (!NT_STATUS_IS_OK(nt_status)) {
 794                 ntlmssp_state->session_key = data_blob(NULL, 0);
 795         } else if (ntlmssp_state->session_key.length) {
 796                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 797         }
 798
 799         data_blob_free(&encrypted_session_key);
 800
 801         /* Only one authentication allowed per server state. */
 802         ntlmssp_state->expected_state = NTLMSSP_DONE;
 803
 804         return nt_status;
 805 }
 806
 807 /**
 808  * Create an NTLMSSP state machine
 809  *
 810  * @param ntlmssp_state NTLMSSP State, allocated by this function
 811  */
 812
 813 NTSTATUS ntlmssp_server_start(NTLMSSP_STATE **ntlmssp_state)
 814 {
 815         TALLOC_CTX *mem_ctx;
 816
 817         mem_ctx = talloc_init("NTLMSSP context");
 818
 819         *ntlmssp_state = TALLOC_ZERO_P(mem_ctx, NTLMSSP_STATE);
 820         if (!*ntlmssp_state) {
 821                 DEBUG(0,("ntlmssp_server_start: talloc failed!\n"));
 822                 talloc_destroy(mem_ctx);
 823                 return NT_STATUS_NO_MEMORY;
 824         }
 825
 826         (*ntlmssp_state)->role = NTLMSSP_SERVER;
 827
 828         (*ntlmssp_state)->mem_ctx = mem_ctx;
 829         (*ntlmssp_state)->get_challenge = get_challenge;
 830         (*ntlmssp_state)->set_challenge = set_challenge;
 831         (*ntlmssp_state)->may_set_challenge = may_set_challenge;
 832
 833         (*ntlmssp_state)->get_global_myname = global_myname;
 834         (*ntlmssp_state)->get_domain = lp_workgroup;
 835         (*ntlmssp_state)->server_role = ROLE_DOMAIN_MEMBER; /* a good default */
 836
 837         (*ntlmssp_state)->expected_state = NTLMSSP_NEGOTIATE;
 838
 839         (*ntlmssp_state)->ref_count = 1;
 840
 841         (*ntlmssp_state)->neg_flags =
 842                 NTLMSSP_NEGOTIATE_128 |
 843                 NTLMSSP_NEGOTIATE_NTLM |
 844                 NTLMSSP_NEGOTIATE_NTLM2 |
 845                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 846                 NTLMSSP_NEGOTIATE_SIGN |
 847                 NTLMSSP_NEGOTIATE_SEAL;
 848
 849         return NT_STATUS_OK;
 850 }
 851
 852 /*********************************************************************
 853  Client side NTLMSSP
 854 *********************************************************************/
 855
 856 /**
 857  * Next state function for the Initial 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_initial(struct ntlmssp_state *ntlmssp_state,
 866                                   DATA_BLOB reply, DATA_BLOB *next_request)
 867 {
 868         if (ntlmssp_state->unicode) {
 869                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 870         } else {
 871                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 872         }
 873
 874         if (ntlmssp_state->use_ntlmv2) {
 875                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 876         }
 877
 878         /* generate the ntlmssp negotiate packet */
 879         msrpc_gen(next_request, "CddAA",
 880                   "NTLMSSP",
 881                   NTLMSSP_NEGOTIATE,
 882                   ntlmssp_state->neg_flags,
 883                   ntlmssp_state->get_domain(),
 884                   ntlmssp_state->get_global_myname());
 885
 886         ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
 887
 888         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 889 }
 890
 891 /**
 892  * Next state function for the Challenge Packet.  Generate an auth packet.
 893  *
 894  * @param ntlmssp_state NTLMSSP State
 895  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 896  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 897  * @return Errors or NT_STATUS_OK.
 898  */
 899
 900 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
 901                                          const DATA_BLOB reply, DATA_BLOB *next_request)
 902 {
 903         uint32 chal_flags, ntlmssp_command, unkn1, unkn2;
 904         DATA_BLOB server_domain_blob;
 905         DATA_BLOB challenge_blob;
 906         DATA_BLOB struct_blob = data_blob(NULL, 0);
 907         char *server_domain;
 908         const char *chal_parse_string;
 909         const char *auth_gen_string;
 910         DATA_BLOB lm_response = data_blob(NULL, 0);
 911         DATA_BLOB nt_response = data_blob(NULL, 0);
 912         DATA_BLOB session_key = data_blob(NULL, 0);
 913         DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
 914         NTSTATUS nt_status = NT_STATUS_OK;
 915
 916         if (!msrpc_parse(&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, (const char *)reply.data, reply.length);
 923
 924                 return NT_STATUS_INVALID_PARAMETER;
 925         }
 926
 927         data_blob_free(&server_domain_blob);
 928
 929         DEBUG(3, ("Got challenge flags:\n"));
 930         debug_ntlmssp_flags(chal_flags);
 931
 932         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
 933
 934         if (ntlmssp_state->unicode) {
 935                 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
 936                         chal_parse_string = "CdUdbddB";
 937                 } else {
 938                         chal_parse_string = "CdUdbdd";
 939                 }
 940                 auth_gen_string = "CdBBUUUBd";
 941         } else {
 942                 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
 943                         chal_parse_string = "CdAdbddB";
 944                 } else {
 945                         chal_parse_string = "CdAdbdd";
 946                 }
 947
 948                 auth_gen_string = "CdBBAAABd";
 949         }
 950
 951         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
 952         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
 953
 954         if (!msrpc_parse(&reply, chal_parse_string,
 955                          "NTLMSSP",
 956                          &ntlmssp_command,
 957                          &server_domain,
 958                          &chal_flags,
 959                          &challenge_blob, 8,
 960                          &unkn1, &unkn2,
 961                          &struct_blob)) {
 962                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
 963                 dump_data(2, (const char *)reply.data, reply.length);
 964                 return NT_STATUS_INVALID_PARAMETER;
 965         }
 966
 967         ntlmssp_state->server_domain = talloc_strdup(ntlmssp_state->mem_ctx,
 968                                                      server_domain);
 969
 970         SAFE_FREE(server_domain);
 971         if (challenge_blob.length != 8) {
 972                 data_blob_free(&struct_blob);
 973                 return NT_STATUS_INVALID_PARAMETER;
 974         }
 975
 976         if (!ntlmssp_state->password) {
 977                 static const uchar zeros[16];
 978                 /* do nothing - blobs are zero length */
 979
 980                 /* session key is all zeros */
 981                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, zeros, 16);
 982
 983                 /* not doing NLTM2 without a password */
 984                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 985         } else if (ntlmssp_state->use_ntlmv2) {
 986
 987                 if (!struct_blob.length) {
 988                         /* be lazy, match win2k - we can't do NTLMv2 without it */
 989                         DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
 990                         return NT_STATUS_INVALID_PARAMETER;
 991                 }
 992
 993                 /* TODO: if the remote server is standalone, then we should replace 'domain'
 994                    with the server name as supplied above */
 995
 996                 if (!SMBNTLMv2encrypt(ntlmssp_state->user,
 997                                       ntlmssp_state->domain,
 998                                       ntlmssp_state->password, &challenge_blob,
 999                                       &struct_blob,
1000                                       &lm_response, &nt_response, &session_key)) {
1001                         data_blob_free(&challenge_blob);
1002                         data_blob_free(&struct_blob);
1003                         return NT_STATUS_NO_MEMORY;
1004                 }
1005         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
1006                 struct MD5Context md5_session_nonce_ctx;
1007                 uchar nt_hash[16];
1008                 uchar session_nonce[16];
1009                 uchar session_nonce_hash[16];
1010                 uchar user_session_key[16];
1011                 E_md4hash(ntlmssp_state->password, nt_hash);
1012
1013                 lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1014                 generate_random_buffer(lm_response.data, 8);
1015                 memset(lm_response.data+8, 0, 16);
1016
1017                 memcpy(session_nonce, challenge_blob.data, 8);
1018                 memcpy(&session_nonce[8], lm_response.data, 8);
1019
1020                 MD5Init(&md5_session_nonce_ctx);
1021                 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
1022                 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
1023                 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
1024
1025                 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
1026                 DEBUG(5, ("challenge is: \n"));
1027                 dump_data(5, (const char *)session_nonce_hash, 8);
1028
1029                 nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1030                 SMBNTencrypt(ntlmssp_state->password,
1031                              session_nonce_hash,
1032                              nt_response.data);
1033
1034                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
1035
1036                 SMBsesskeygen_ntv1(nt_hash, NULL, user_session_key);
1037                 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
1038                 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
1039         } else {
1040                 uchar lm_hash[16];
1041                 uchar nt_hash[16];
1042                 E_deshash(ntlmssp_state->password, lm_hash);
1043                 E_md4hash(ntlmssp_state->password, nt_hash);
1044
1045                 /* lanman auth is insecure, it may be disabled */
1046                 if (lp_client_lanman_auth()) {
1047                         lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1048                         SMBencrypt(ntlmssp_state->password,challenge_blob.data,
1049                                    lm_response.data);
1050                 }
1051
1052                 nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1053                 SMBNTencrypt(ntlmssp_state->password,challenge_blob.data,
1054                              nt_response.data);
1055
1056                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
1057                 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
1058                     && lp_client_lanman_auth()) {
1059                         SMBsesskeygen_lm_sess_key(lm_hash, lm_response.data,
1060                                         session_key.data);
1061                         dump_data_pw("LM session key\n", session_key.data, session_key.length);
1062                 } else {
1063                         SMBsesskeygen_ntv1(nt_hash, NULL, session_key.data);
1064                         dump_data_pw("NT session key:\n", session_key.data, session_key.length);
1065                 }
1066         }
1067         data_blob_free(&struct_blob);
1068
1069         /* Key exchange encryptes a new client-generated session key with
1070            the password-derived key */
1071         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
1072                 /* Make up a new session key */
1073                 uint8 client_session_key[16];
1074                 generate_random_buffer(client_session_key, sizeof(client_session_key));
1075
1076                 /* Encrypt the new session key with the old one */
1077                 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
1078                 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
1079                 SamOEMhash(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
1080                 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
1081
1082                 /* Mark the new session key as the 'real' session key */
1083                 data_blob_free(&session_key);
1084                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, client_session_key, sizeof(client_session_key));
1085         }
1086
1087         /* this generates the actual auth packet */
1088         if (!msrpc_gen(next_request, auth_gen_string,
1089                        "NTLMSSP",
1090                        NTLMSSP_AUTH,
1091                        lm_response.data, lm_response.length,
1092                        nt_response.data, nt_response.length,
1093                        ntlmssp_state->domain,
1094                        ntlmssp_state->user,
1095                        ntlmssp_state->get_global_myname(),
1096                        encrypted_session_key.data, encrypted_session_key.length,
1097                        ntlmssp_state->neg_flags)) {
1098
1099                 return NT_STATUS_NO_MEMORY;
1100         }
1101
1102         data_blob_free(&encrypted_session_key);
1103
1104         data_blob_free(&ntlmssp_state->chal);
1105
1106         ntlmssp_state->session_key = session_key;
1107
1108         ntlmssp_state->chal = challenge_blob;
1109         ntlmssp_state->lm_resp = lm_response;
1110         ntlmssp_state->nt_resp = nt_response;
1111
1112         ntlmssp_state->expected_state = NTLMSSP_DONE;
1113
1114         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
1115                 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
1116         }
1117
1118         return nt_status;
1119 }
1120
1121 NTSTATUS ntlmssp_client_start(NTLMSSP_STATE **ntlmssp_state)
1122 {
1123         TALLOC_CTX *mem_ctx;
1124
1125         mem_ctx = talloc_init("NTLMSSP Client context");
1126
1127         *ntlmssp_state = TALLOC_ZERO_P(mem_ctx, NTLMSSP_STATE);
1128         if (!*ntlmssp_state) {
1129                 DEBUG(0,("ntlmssp_client_start: talloc failed!\n"));
1130                 talloc_destroy(mem_ctx);
1131                 return NT_STATUS_NO_MEMORY;
1132         }
1133
1134         (*ntlmssp_state)->role = NTLMSSP_CLIENT;
1135
1136         (*ntlmssp_state)->mem_ctx = mem_ctx;
1137
1138         (*ntlmssp_state)->get_global_myname = global_myname;
1139         (*ntlmssp_state)->get_domain = lp_workgroup;
1140
1141         (*ntlmssp_state)->unicode = True;
1142
1143         (*ntlmssp_state)->use_ntlmv2 = lp_client_ntlmv2_auth();
1144
1145         (*ntlmssp_state)->expected_state = NTLMSSP_INITIAL;
1146
1147         (*ntlmssp_state)->ref_count = 1;
1148
1149         (*ntlmssp_state)->neg_flags =
1150                 NTLMSSP_NEGOTIATE_128 |
1151                 NTLMSSP_NEGOTIATE_NTLM |
1152                 NTLMSSP_NEGOTIATE_NTLM2 |
1153                 NTLMSSP_NEGOTIATE_KEY_EXCH |
1154                 /*
1155                  * We need to set this to allow a later SetPassword
1156                  * via the SAMR pipe to succeed. Strange.... We could
1157                  * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
1158                  * */
1159                 NTLMSSP_NEGOTIATE_SIGN |
1160                 NTLMSSP_REQUEST_TARGET;
1161
1162         return NT_STATUS_OK;
1163 }