release/src/router/samba3/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         }
 367
 368         if (!(neg_flags & NTLMSSP_NEGOTIATE_56)) {
 369                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_56;
 370         }
 371
 372         if (!(neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)) {
 373                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_KEY_EXCH;
 374         }
 375
 376         if (!(neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
 377                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN;
 378         }
 379
 380         if (!(neg_flags & NTLMSSP_NEGOTIATE_SEAL)) {
 381                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SEAL;
 382         }
 383
 384         /* Woop Woop - unknown flag for Windows compatibility...
 385            What does this really do ? JRA. */
 386         if (!(neg_flags & NTLMSSP_UNKNOWN_02000000)) {
 387                 ntlmssp_state->neg_flags &= ~NTLMSSP_UNKNOWN_02000000;
 388         }
 389
 390         if ((neg_flags & NTLMSSP_REQUEST_TARGET)) {
 391                 ntlmssp_state->neg_flags |= NTLMSSP_REQUEST_TARGET;
 392         }
 393 }
 394
 395 /**
 396  Weaken NTLMSSP keys to cope with down-level clients and servers.
 397
 398  We probably should have some parameters to control this, but as
 399  it only occours for LM_KEY connections, and this is controlled
 400  by the client lanman auth/lanman auth parameters, it isn't too bad.
 401 */
 402
 403 DATA_BLOB ntlmssp_weaken_keys(NTLMSSP_STATE *ntlmssp_state, TALLOC_CTX *mem_ctx)
 404 {
 405         DATA_BLOB weakened_key = data_blob_talloc(mem_ctx,
 406                                         ntlmssp_state->session_key.data,
 407                                         ntlmssp_state->session_key.length);
 408
 409         /* Nothing to weaken.  We certainly don't want to 'extend' the length... */
 410         if (weakened_key.length < 16) {
 411                 /* perhaps there was no key? */
 412                 return weakened_key;
 413         }
 414
 415         /* Key weakening not performed on the master key for NTLM2
 416            and does not occour for NTLM1.  Therefore we only need
 417            to do this for the LM_KEY.
 418         */
 419
 420         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
 421                 /* LM key doesn't support 128 bit crypto, so this is
 422                  * the best we can do.  If you negotiate 128 bit, but
 423                  * not 56, you end up with 40 bit... */
 424                 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
 425                         weakened_key.data[7] = 0xa0;
 426                 } else { /* forty bits */
 427                         weakened_key.data[5] = 0xe5;
 428                         weakened_key.data[6] = 0x38;
 429                         weakened_key.data[7] = 0xb0;
 430                 }
 431                 weakened_key.length = 8;
 432         }
 433         return weakened_key;
 434 }
 435
 436 /**
 437  * Next state function for the Negotiate packet
 438  *
 439  * @param ntlmssp_state NTLMSSP State
 440  * @param request The request, as a DATA_BLOB
 441  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 442  * @return Errors or MORE_PROCESSING_REQUIRED if a reply is sent.
 443  */
 444
 445 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
 446                                          const DATA_BLOB request, DATA_BLOB *reply)
 447 {
 448         DATA_BLOB struct_blob;
 449         fstring dnsname, dnsdomname;
 450         uint32 neg_flags = 0;
 451         uint32 ntlmssp_command, chal_flags;
 452         const uint8 *cryptkey;
 453         const char *target_name;
 454
 455         /* parse the NTLMSSP packet */
 456 #if 0
 457         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 458 #endif
 459
 460         if (request.length) {
 461                 if ((request.length < 16) || !msrpc_parse(&request, "Cdd",
 462                                                         "NTLMSSP",
 463                                                         &ntlmssp_command,
 464                                                         &neg_flags)) {
 465                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
 466                                 (unsigned int)request.length));
 467                         dump_data(2, (const char *)request.data, request.length);
 468                         return NT_STATUS_INVALID_PARAMETER;
 469                 }
 470                 debug_ntlmssp_flags(neg_flags);
 471         }
 472
 473         ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, lp_lanman_auth());
 474
 475         /* Ask our caller what challenge they would like in the packet */
 476         cryptkey = ntlmssp_state->get_challenge(ntlmssp_state);
 477
 478         /* Check if we may set the challenge */
 479         if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
 480                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 481         }
 482
 483         /* The flags we send back are not just the negotiated flags,
 484          * they are also 'what is in this packet'.  Therfore, we
 485          * operate on 'chal_flags' from here on
 486          */
 487
 488         chal_flags = ntlmssp_state->neg_flags;
 489
 490         /* get the right name to fill in as 'target' */
 491         target_name = ntlmssp_target_name(ntlmssp_state,
 492                                           neg_flags, &chal_flags);
 493         if (target_name == NULL)
 494                 return NT_STATUS_INVALID_PARAMETER;
 495
 496         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, cryptkey, 8);
 497         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state->mem_ctx, cryptkey, 8);
 498
 499
 500         /* This should be a 'netbios domain -> DNS domain' mapping */
 501         dnsdomname[0] = '\0';
 502         get_mydnsdomname(dnsdomname);
 503         strlower_m(dnsdomname);
 504
 505         dnsname[0] = '\0';
 506         get_mydnsfullname(dnsname);
 507
 508         /* This creates the 'blob' of names that appears at the end of the packet */
 509         if (chal_flags & NTLMSSP_CHAL_TARGET_INFO)
 510         {
 511                 msrpc_gen(&struct_blob, "aaaaa",
 512                           NTLMSSP_NAME_TYPE_DOMAIN, target_name,
 513                           NTLMSSP_NAME_TYPE_SERVER, ntlmssp_state->get_global_myname(),
 514                           NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
 515                           NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
 516                           0, "");
 517         } else {
 518                 struct_blob = data_blob(NULL, 0);
 519         }
 520
 521         {
 522                 /* Marshel the packet in the right format, be it unicode or ASCII */
 523                 const char *gen_string;
 524                 if (ntlmssp_state->unicode) {
 525                         gen_string = "CdUdbddB";
 526                 } else {
 527                         gen_string = "CdAdbddB";
 528                 }
 529
 530                 msrpc_gen(reply, gen_string,
 531                           "NTLMSSP",
 532                           NTLMSSP_CHALLENGE,
 533                           target_name,
 534                           chal_flags,
 535                           cryptkey, 8,
 536                           0, 0,
 537                           struct_blob.data, struct_blob.length);
 538         }
 539
 540         data_blob_free(&struct_blob);
 541
 542         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 543
 544         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 545 }
 546
 547 /**
 548  * Next state function for the Authenticate packet
 549  *
 550  * @param ntlmssp_state NTLMSSP State
 551  * @param request The request, as a DATA_BLOB
 552  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 553  * @return Errors or NT_STATUS_OK.
 554  */
 555
 556 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
 557                                     const DATA_BLOB request, DATA_BLOB *reply)
 558 {
 559         DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
 560         DATA_BLOB user_session_key = data_blob(NULL, 0);
 561         DATA_BLOB lm_session_key = data_blob(NULL, 0);
 562         DATA_BLOB session_key = data_blob(NULL, 0);
 563         uint32 ntlmssp_command, auth_flags;
 564         NTSTATUS nt_status = NT_STATUS_OK;
 565
 566         /* used by NTLM2 */
 567         BOOL doing_ntlm2 = False;
 568
 569         uchar session_nonce[16];
 570         uchar session_nonce_hash[16];
 571
 572         const char *parse_string;
 573         char *domain = NULL;
 574         char *user = NULL;
 575         char *workstation = NULL;
 576
 577         /* parse the NTLMSSP packet */
 578         *reply = data_blob(NULL, 0);
 579
 580 #if 0
 581         file_save("ntlmssp_auth.dat", request.data, request.length);
 582 #endif
 583
 584         if (ntlmssp_state->unicode) {
 585                 parse_string = "CdBBUUUBd";
 586         } else {
 587                 parse_string = "CdBBAAABd";
 588         }
 589
 590         data_blob_free(&ntlmssp_state->lm_resp);
 591         data_blob_free(&ntlmssp_state->nt_resp);
 592
 593         ntlmssp_state->user = NULL;
 594         ntlmssp_state->domain = NULL;
 595         ntlmssp_state->workstation = NULL;
 596
 597         /* now the NTLMSSP encoded auth hashes */
 598         if (!msrpc_parse(&request, parse_string,
 599                          "NTLMSSP",
 600                          &ntlmssp_command,
 601                          &ntlmssp_state->lm_resp,
 602                          &ntlmssp_state->nt_resp,
 603                          &domain,
 604                          &user,
 605                          &workstation,
 606                          &encrypted_session_key,
 607                          &auth_flags)) {
 608                 SAFE_FREE(domain);
 609                 SAFE_FREE(user);
 610                 SAFE_FREE(workstation);
 611                 data_blob_free(&encrypted_session_key);
 612                 auth_flags = 0;
 613
 614                 /* Try again with a shorter string (Win9X truncates this packet) */
 615                 if (ntlmssp_state->unicode) {
 616                         parse_string = "CdBBUUU";
 617                 } else {
 618                         parse_string = "CdBBAAA";
 619                 }
 620
 621                 /* now the NTLMSSP encoded auth hashes */
 622                 if (!msrpc_parse(&request, parse_string,
 623                                  "NTLMSSP",
 624                                  &ntlmssp_command,
 625                                  &ntlmssp_state->lm_resp,
 626                                  &ntlmssp_state->nt_resp,
 627                                  &domain,
 628                                  &user,
 629                                  &workstation)) {
 630                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
 631                         dump_data(2, (const char *)request.data, request.length);
 632                         SAFE_FREE(domain);
 633                         SAFE_FREE(user);
 634                         SAFE_FREE(workstation);
 635
 636                         return NT_STATUS_INVALID_PARAMETER;
 637                 }
 638         }
 639
 640         if (auth_flags)
 641                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
 642
 643         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, domain))) {
 644                 SAFE_FREE(domain);
 645                 SAFE_FREE(user);
 646                 SAFE_FREE(workstation);
 647                 data_blob_free(&encrypted_session_key);
 648                 return nt_status;
 649         }
 650
 651         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(ntlmssp_state, user))) {
 652                 SAFE_FREE(domain);
 653                 SAFE_FREE(user);
 654                 SAFE_FREE(workstation);
 655                 data_blob_free(&encrypted_session_key);
 656                 return nt_status;
 657         }
 658
 659         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(ntlmssp_state, workstation))) {
 660                 SAFE_FREE(domain);
 661                 SAFE_FREE(user);
 662                 SAFE_FREE(workstation);
 663                 data_blob_free(&encrypted_session_key);
 664                 return nt_status;
 665         }
 666
 667         SAFE_FREE(domain);
 668         SAFE_FREE(user);
 669         SAFE_FREE(workstation);
 670
 671         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 672                  ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
 673
 674 #if 0
 675         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 676         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 677 #endif
 678
 679         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 680            client challenge
 681
 682            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 683         */
 684         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 685                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 686                         struct MD5Context md5_session_nonce_ctx;
 687                         SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
 688
 689                         doing_ntlm2 = True;
 690
 691                         memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
 692                         memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 693
 694                         MD5Init(&md5_session_nonce_ctx);
 695                         MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
 696                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 697
 698                         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, session_nonce_hash, 8);
 699
 700                         /* LM response is no longer useful */
 701                         data_blob_free(&ntlmssp_state->lm_resp);
 702
 703                         /* We changed the effective challenge - set it */
 704                         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
 705                                 data_blob_free(&encrypted_session_key);
 706                                 return nt_status;
 707                         }
 708
 709                         /* LM Key is incompatible. */
 710                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 711                 }
 712         }
 713
 714         /*
 715          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 716          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 717          * smb.conf file) and no NTLMv2 response was sent then the password check
 718          * will fail here. JRA.
 719          */
 720
 721         /* Finally, actually ask if the password is OK */
 722
 723         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
 724                                                                        &user_session_key, &lm_session_key))) {
 725                 data_blob_free(&encrypted_session_key);
 726                 return nt_status;
 727         }
 728
 729         dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
 730         dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
 731
 732         /* Handle the different session key derivation for NTLM2 */
 733         if (doing_ntlm2) {
 734                 if (user_session_key.data && user_session_key.length == 16) {
 735                         session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
 736                         hmac_md5(user_session_key.data, session_nonce,
 737                                  sizeof(session_nonce), session_key.data);
 738                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 739                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 740
 741                 } else {
 742                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 743                         session_key = data_blob(NULL, 0);
 744                 }
 745         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
 746                 if (lm_session_key.data && lm_session_key.length >= 8) {
 747                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 748                                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
 749                                 if (session_key.data == NULL) {
 750                                         return NT_STATUS_NO_MEMORY;
 751                                 }
 752                                 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
 753                                                           session_key.data);
 754                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 755                         } else {
 756                                 static const uint8 zeros[24] = { 0, };
 757                                 session_key = data_blob_talloc(
 758                                         ntlmssp_state->mem_ctx, NULL, 16);
 759                                 if (session_key.data == NULL) {
 760                                         return NT_STATUS_NO_MEMORY;
 761                                 }
 762                                 SMBsesskeygen_lm_sess_key(
 763                                         lm_session_key.data, zeros,
 764                                         session_key.data);
 765                         }
 766                         dump_data_pw("LM session key:\n", session_key.data,
 767                                      session_key.length);
 768                 } else {
 769                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 770                         session_key = data_blob(NULL, 0);
 771                 }
 772         } else if (user_session_key.data) {
 773                 session_key = user_session_key;
 774                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 775                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 776         } else if (lm_session_key.data) {
 777                 session_key = lm_session_key;
 778                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 779                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 780         } else {
 781                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 782                 session_key = data_blob(NULL, 0);
 783         }
 784
 785         /* With KEY_EXCH, the client supplies the proposed session key,
 786            but encrypts it with the long-term key */
 787         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 788                 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
 789                         data_blob_free(&encrypted_session_key);
 790                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 791                                   (unsigned int)encrypted_session_key.length));
 792                         return NT_STATUS_INVALID_PARAMETER;
 793                 } else if (!session_key.data || session_key.length != 16) {
 794                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 795                                   (unsigned int)session_key.length));
 796                         ntlmssp_state->session_key = session_key;
 797                 } else {
 798                         dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
 799                         SamOEMhash(encrypted_session_key.data,
 800                                    session_key.data,
 801                                    encrypted_session_key.length);
 802                         ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state->mem_ctx,
 803                                                                       encrypted_session_key.data,
 804                                                                       encrypted_session_key.length);
 805                         dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
 806                                      encrypted_session_key.length);
 807                 }
 808         } else {
 809                 ntlmssp_state->session_key = session_key;
 810         }
 811
 812         if (!NT_STATUS_IS_OK(nt_status)) {
 813                 ntlmssp_state->session_key = data_blob(NULL, 0);
 814         } else if (ntlmssp_state->session_key.length) {
 815                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 816         }
 817
 818         data_blob_free(&encrypted_session_key);
 819
 820         /* Only one authentication allowed per server state. */
 821         ntlmssp_state->expected_state = NTLMSSP_DONE;
 822
 823         return nt_status;
 824 }
 825
 826 /**
 827  * Create an NTLMSSP state machine
 828  *
 829  * @param ntlmssp_state NTLMSSP State, allocated by this function
 830  */
 831
 832 NTSTATUS ntlmssp_server_start(NTLMSSP_STATE **ntlmssp_state)
 833 {
 834         TALLOC_CTX *mem_ctx;
 835
 836         mem_ctx = talloc_init("NTLMSSP context");
 837
 838         *ntlmssp_state = TALLOC_ZERO_P(mem_ctx, NTLMSSP_STATE);
 839         if (!*ntlmssp_state) {
 840                 DEBUG(0,("ntlmssp_server_start: talloc failed!\n"));
 841                 talloc_destroy(mem_ctx);
 842                 return NT_STATUS_NO_MEMORY;
 843         }
 844
 845         (*ntlmssp_state)->role = NTLMSSP_SERVER;
 846
 847         (*ntlmssp_state)->mem_ctx = mem_ctx;
 848         (*ntlmssp_state)->get_challenge = get_challenge;
 849         (*ntlmssp_state)->set_challenge = set_challenge;
 850         (*ntlmssp_state)->may_set_challenge = may_set_challenge;
 851
 852         (*ntlmssp_state)->get_global_myname = global_myname;
 853         (*ntlmssp_state)->get_domain = lp_workgroup;
 854         (*ntlmssp_state)->server_role = ROLE_DOMAIN_MEMBER; /* a good default */
 855
 856         (*ntlmssp_state)->expected_state = NTLMSSP_NEGOTIATE;
 857
 858         (*ntlmssp_state)->ref_count = 1;
 859
 860         (*ntlmssp_state)->neg_flags =
 861                 NTLMSSP_NEGOTIATE_128 |
 862                 NTLMSSP_NEGOTIATE_56 |
 863                 NTLMSSP_UNKNOWN_02000000 |
 864                 NTLMSSP_NEGOTIATE_NTLM |
 865                 NTLMSSP_NEGOTIATE_NTLM2 |
 866                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 867                 NTLMSSP_NEGOTIATE_SIGN |
 868                 NTLMSSP_NEGOTIATE_SEAL;
 869
 870         return NT_STATUS_OK;
 871 }
 872
 873 /*********************************************************************
 874  Client side NTLMSSP
 875 *********************************************************************/
 876
 877 /**
 878  * Next state function for the Initial packet
 879  *
 880  * @param ntlmssp_state NTLMSSP State
 881  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 882  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 883  * @return Errors or NT_STATUS_OK.
 884  */
 885
 886 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
 887                                   DATA_BLOB reply, DATA_BLOB *next_request)
 888 {
 889         if (ntlmssp_state->unicode) {
 890                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 891         } else {
 892                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 893         }
 894
 895         if (ntlmssp_state->use_ntlmv2) {
 896                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 897         }
 898
 899         /* generate the ntlmssp negotiate packet */
 900         msrpc_gen(next_request, "CddAA",
 901                   "NTLMSSP",
 902                   NTLMSSP_NEGOTIATE,
 903                   ntlmssp_state->neg_flags,
 904                   ntlmssp_state->get_domain(),
 905                   ntlmssp_state->get_global_myname());
 906
 907         ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
 908
 909         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 910 }
 911
 912 /**
 913  * Next state function for the Challenge Packet.  Generate an auth packet.
 914  *
 915  * @param ntlmssp_state NTLMSSP State
 916  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 917  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 918  * @return Errors or NT_STATUS_OK.
 919  */
 920
 921 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
 922                                          const DATA_BLOB reply, DATA_BLOB *next_request)
 923 {
 924         uint32 chal_flags, ntlmssp_command, unkn1, unkn2;
 925         DATA_BLOB server_domain_blob;
 926         DATA_BLOB challenge_blob;
 927         DATA_BLOB struct_blob = data_blob(NULL, 0);
 928         char *server_domain;
 929         const char *chal_parse_string;
 930         const char *auth_gen_string;
 931         DATA_BLOB lm_response = data_blob(NULL, 0);
 932         DATA_BLOB nt_response = data_blob(NULL, 0);
 933         DATA_BLOB session_key = data_blob(NULL, 0);
 934         DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
 935         NTSTATUS nt_status = NT_STATUS_OK;
 936
 937         if (!msrpc_parse(&reply, "CdBd",
 938                          "NTLMSSP",
 939                          &ntlmssp_command,
 940                          &server_domain_blob,
 941                          &chal_flags)) {
 942                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
 943                 dump_data(2, (const char *)reply.data, reply.length);
 944
 945                 return NT_STATUS_INVALID_PARAMETER;
 946         }
 947
 948         data_blob_free(&server_domain_blob);
 949
 950         DEBUG(3, ("Got challenge flags:\n"));
 951         debug_ntlmssp_flags(chal_flags);
 952
 953         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
 954
 955         if (ntlmssp_state->unicode) {
 956                 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
 957                         chal_parse_string = "CdUdbddB";
 958                 } else {
 959                         chal_parse_string = "CdUdbdd";
 960                 }
 961                 auth_gen_string = "CdBBUUUBd";
 962         } else {
 963                 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
 964                         chal_parse_string = "CdAdbddB";
 965                 } else {
 966                         chal_parse_string = "CdAdbdd";
 967                 }
 968
 969                 auth_gen_string = "CdBBAAABd";
 970         }
 971
 972         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
 973         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
 974
 975         if (!msrpc_parse(&reply, chal_parse_string,
 976                          "NTLMSSP",
 977                          &ntlmssp_command,
 978                          &server_domain,
 979                          &chal_flags,
 980                          &challenge_blob, 8,
 981                          &unkn1, &unkn2,
 982                          &struct_blob)) {
 983                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
 984                 dump_data(2, (const char *)reply.data, reply.length);
 985                 return NT_STATUS_INVALID_PARAMETER;
 986         }
 987
 988         ntlmssp_state->server_domain = talloc_strdup(ntlmssp_state->mem_ctx,
 989                                                      server_domain);
 990
 991         SAFE_FREE(server_domain);
 992         if (challenge_blob.length != 8) {
 993                 data_blob_free(&struct_blob);
 994                 return NT_STATUS_INVALID_PARAMETER;
 995         }
 996
 997         if (!ntlmssp_state->password) {
 998                 static const uchar zeros[16];
 999                 /* do nothing - blobs are zero length */
1000
1001                 /* session key is all zeros */
1002                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, zeros, 16);
1003
1004                 /* not doing NLTM2 without a password */
1005                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
1006         } else if (ntlmssp_state->use_ntlmv2) {
1007
1008                 if (!struct_blob.length) {
1009                         /* be lazy, match win2k - we can't do NTLMv2 without it */
1010                         DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
1011                         return NT_STATUS_INVALID_PARAMETER;
1012                 }
1013
1014                 /* TODO: if the remote server is standalone, then we should replace 'domain'
1015                    with the server name as supplied above */
1016
1017                 if (!SMBNTLMv2encrypt(ntlmssp_state->user,
1018                                       ntlmssp_state->domain,
1019                                       ntlmssp_state->password, &challenge_blob,
1020                                       &struct_blob,
1021                                       &lm_response, &nt_response, &session_key)) {
1022                         data_blob_free(&challenge_blob);
1023                         data_blob_free(&struct_blob);
1024                         return NT_STATUS_NO_MEMORY;
1025                 }
1026         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
1027                 struct MD5Context md5_session_nonce_ctx;
1028                 uchar nt_hash[16];
1029                 uchar session_nonce[16];
1030                 uchar session_nonce_hash[16];
1031                 uchar user_session_key[16];
1032                 E_md4hash(ntlmssp_state->password, nt_hash);
1033
1034                 lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1035                 generate_random_buffer(lm_response.data, 8);
1036                 memset(lm_response.data+8, 0, 16);
1037
1038                 memcpy(session_nonce, challenge_blob.data, 8);
1039                 memcpy(&session_nonce[8], lm_response.data, 8);
1040
1041                 MD5Init(&md5_session_nonce_ctx);
1042                 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
1043                 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
1044                 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
1045
1046                 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
1047                 DEBUG(5, ("challenge is: \n"));
1048                 dump_data(5, (const char *)session_nonce_hash, 8);
1049
1050                 nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1051                 SMBNTencrypt(ntlmssp_state->password,
1052                              session_nonce_hash,
1053                              nt_response.data);
1054
1055                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
1056
1057                 SMBsesskeygen_ntv1(nt_hash, NULL, user_session_key);
1058                 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
1059                 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
1060         } else {
1061                 uchar lm_hash[16];
1062                 uchar nt_hash[16];
1063                 E_deshash(ntlmssp_state->password, lm_hash);
1064                 E_md4hash(ntlmssp_state->password, nt_hash);
1065
1066                 /* lanman auth is insecure, it may be disabled */
1067                 if (lp_client_lanman_auth()) {
1068                         lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1069                         SMBencrypt(ntlmssp_state->password,challenge_blob.data,
1070                                    lm_response.data);
1071                 }
1072
1073                 nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1074                 SMBNTencrypt(ntlmssp_state->password,challenge_blob.data,
1075                              nt_response.data);
1076
1077                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
1078                 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
1079                     && lp_client_lanman_auth()) {
1080                         SMBsesskeygen_lm_sess_key(lm_hash, lm_response.data,
1081                                         session_key.data);
1082                         dump_data_pw("LM session key\n", session_key.data, session_key.length);
1083                 } else {
1084                         SMBsesskeygen_ntv1(nt_hash, NULL, session_key.data);
1085                         dump_data_pw("NT session key:\n", session_key.data, session_key.length);
1086                 }
1087         }
1088         data_blob_free(&struct_blob);
1089
1090         /* Key exchange encryptes a new client-generated session key with
1091            the password-derived key */
1092         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
1093                 /* Make up a new session key */
1094                 uint8 client_session_key[16];
1095                 generate_random_buffer(client_session_key, sizeof(client_session_key));
1096
1097                 /* Encrypt the new session key with the old one */
1098                 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
1099                 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
1100                 SamOEMhash(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
1101                 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
1102
1103                 /* Mark the new session key as the 'real' session key */
1104                 data_blob_free(&session_key);
1105                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, client_session_key, sizeof(client_session_key));
1106         }
1107
1108         /* this generates the actual auth packet */
1109         if (!msrpc_gen(next_request, auth_gen_string,
1110                        "NTLMSSP",
1111                        NTLMSSP_AUTH,
1112                        lm_response.data, lm_response.length,
1113                        nt_response.data, nt_response.length,
1114                        ntlmssp_state->domain,
1115                        ntlmssp_state->user,
1116                        ntlmssp_state->get_global_myname(),
1117                        encrypted_session_key.data, encrypted_session_key.length,
1118                        ntlmssp_state->neg_flags)) {
1119
1120                 return NT_STATUS_NO_MEMORY;
1121         }
1122
1123         data_blob_free(&encrypted_session_key);
1124
1125         data_blob_free(&ntlmssp_state->chal);
1126
1127         ntlmssp_state->session_key = session_key;
1128
1129         ntlmssp_state->chal = challenge_blob;
1130         ntlmssp_state->lm_resp = lm_response;
1131         ntlmssp_state->nt_resp = nt_response;
1132
1133         ntlmssp_state->expected_state = NTLMSSP_DONE;
1134
1135         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
1136                 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
1137         }
1138
1139         return nt_status;
1140 }
1141
1142 NTSTATUS ntlmssp_client_start(NTLMSSP_STATE **ntlmssp_state)
1143 {
1144         TALLOC_CTX *mem_ctx;
1145
1146         mem_ctx = talloc_init("NTLMSSP Client context");
1147
1148         *ntlmssp_state = TALLOC_ZERO_P(mem_ctx, NTLMSSP_STATE);
1149         if (!*ntlmssp_state) {
1150                 DEBUG(0,("ntlmssp_client_start: talloc failed!\n"));
1151                 talloc_destroy(mem_ctx);
1152                 return NT_STATUS_NO_MEMORY;
1153         }
1154
1155         (*ntlmssp_state)->role = NTLMSSP_CLIENT;
1156
1157         (*ntlmssp_state)->mem_ctx = mem_ctx;
1158
1159         (*ntlmssp_state)->get_global_myname = global_myname;
1160         (*ntlmssp_state)->get_domain = lp_workgroup;
1161
1162         (*ntlmssp_state)->unicode = True;
1163
1164         (*ntlmssp_state)->use_ntlmv2 = lp_client_ntlmv2_auth();
1165
1166         (*ntlmssp_state)->expected_state = NTLMSSP_INITIAL;
1167
1168         (*ntlmssp_state)->ref_count = 1;
1169
1170         (*ntlmssp_state)->neg_flags =
1171                 NTLMSSP_NEGOTIATE_128 |
1172                 NTLMSSP_NEGOTIATE_NTLM |
1173                 NTLMSSP_NEGOTIATE_NTLM2 |
1174                 NTLMSSP_NEGOTIATE_KEY_EXCH |
1175                 /*
1176                  * We need to set this to allow a later SetPassword
1177                  * via the SAMR pipe to succeed. Strange.... We could
1178                  * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
1179                  * */
1180                 NTLMSSP_NEGOTIATE_SIGN |
1181                 NTLMSSP_REQUEST_TARGET;
1182
1183         return NT_STATUS_OK;
1184 }