source3/libsmb/ntlmssp.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    handle NLTMSSP, server side
   5
   6    Copyright (C) Andrew Tridgell      2001
   7    Copyright (C) Andrew Bartlett 2001-2003
   8    Copyright (C) Andrew Bartlett 2005 (Updated from gensec).
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 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  * Store NT and LM hashes on an NTLMSSP context - ensures they are talloc()ed
 159  *
 160  */
 161 NTSTATUS ntlmssp_set_hashes(NTLMSSP_STATE *ntlmssp_state,
 162                 const unsigned char lm_hash[16],
 163                 const unsigned char nt_hash[16])
 164 {
 165         ntlmssp_state->lm_hash = (unsigned char *)
 166                 TALLOC_MEMDUP(ntlmssp_state->mem_ctx, lm_hash, 16);
 167         ntlmssp_state->nt_hash = (unsigned char *)
 168                 TALLOC_MEMDUP(ntlmssp_state->mem_ctx, nt_hash, 16);
 169         if (!ntlmssp_state->lm_hash || !ntlmssp_state->nt_hash) {
 170                 TALLOC_FREE(ntlmssp_state->lm_hash);
 171                 TALLOC_FREE(ntlmssp_state->nt_hash);
 172                 return NT_STATUS_NO_MEMORY;
 173         }
 174         return NT_STATUS_OK;
 175 }
 176
 177 /**
 178  * Converts a password to the hashes on an NTLMSSP context.
 179  *
 180  */
 181 NTSTATUS ntlmssp_set_password(NTLMSSP_STATE *ntlmssp_state, const char *password)
 182 {
 183         if (!password) {
 184                 ntlmssp_state->lm_hash = NULL;
 185                 ntlmssp_state->nt_hash = NULL;
 186         } else {
 187                 unsigned char lm_hash[16];
 188                 unsigned char nt_hash[16];
 189
 190                 E_deshash(password, lm_hash);
 191                 E_md4hash(password, nt_hash);
 192                 return ntlmssp_set_hashes(ntlmssp_state, lm_hash, nt_hash);
 193         }
 194         return NT_STATUS_OK;
 195 }
 196
 197 /**
 198  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
 199  *
 200  */
 201 NTSTATUS ntlmssp_set_domain(NTLMSSP_STATE *ntlmssp_state, const char *domain)
 202 {
 203         ntlmssp_state->domain = talloc_strdup(ntlmssp_state->mem_ctx, domain ? domain : "" );
 204         if (!ntlmssp_state->domain) {
 205                 return NT_STATUS_NO_MEMORY;
 206         }
 207         return NT_STATUS_OK;
 208 }
 209
 210 /**
 211  * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
 212  *
 213  */
 214 NTSTATUS ntlmssp_set_workstation(NTLMSSP_STATE *ntlmssp_state, const char *workstation)
 215 {
 216         ntlmssp_state->workstation = talloc_strdup(ntlmssp_state->mem_ctx, workstation);
 217         if (!ntlmssp_state->workstation) {
 218                 return NT_STATUS_NO_MEMORY;
 219         }
 220         return NT_STATUS_OK;
 221 }
 222
 223 /**
 224  *  Store a DATA_BLOB containing an NTLMSSP response, for use later.
 225  *  This copies the data blob
 226  */
 227
 228 NTSTATUS ntlmssp_store_response(NTLMSSP_STATE *ntlmssp_state,
 229                                 DATA_BLOB response)
 230 {
 231         ntlmssp_state->stored_response = data_blob_talloc(ntlmssp_state->mem_ctx,
 232                                                           response.data, response.length);
 233         return NT_STATUS_OK;
 234 }
 235
 236 /**
 237  * Request features for the NTLMSSP negotiation
 238  *
 239  * @param ntlmssp_state NTLMSSP state
 240  * @param feature_list List of space seperated features requested from NTLMSSP.
 241  */
 242 void ntlmssp_want_feature_list(NTLMSSP_STATE *ntlmssp_state, char *feature_list)
 243 {
 244         /*
 245          * We need to set this to allow a later SetPassword
 246          * via the SAMR pipe to succeed. Strange.... We could
 247          * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
 248          */
 249         if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, True)) {
 250                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 251         }
 252         if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, True)) {
 253                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 254         }
 255         if(in_list("NTLMSSP_FEATURE_SEAL", feature_list, True)) {
 256                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 257         }
 258 }
 259
 260 /**
 261  * Request a feature for the NTLMSSP negotiation
 262  *
 263  * @param ntlmssp_state NTLMSSP state
 264  * @param feature Bit flag specifying the requested feature
 265  */
 266 void ntlmssp_want_feature(NTLMSSP_STATE *ntlmssp_state, uint32 feature)
 267 {
 268         /* As per JRA's comment above */
 269         if (feature & NTLMSSP_FEATURE_SESSION_KEY) {
 270                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 271         }
 272         if (feature & NTLMSSP_FEATURE_SIGN) {
 273                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 274         }
 275         if (feature & NTLMSSP_FEATURE_SEAL) {
 276                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 277         }
 278 }
 279
 280 /**
 281  * Next state function for the NTLMSSP state machine
 282  *
 283  * @param ntlmssp_state NTLMSSP State
 284  * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
 285  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 286  * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
 287  */
 288
 289 NTSTATUS ntlmssp_update(NTLMSSP_STATE *ntlmssp_state,
 290                         const DATA_BLOB in, DATA_BLOB *out)
 291 {
 292         DATA_BLOB input;
 293         uint32 ntlmssp_command;
 294         int i;
 295
 296         if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
 297                 /* Called update after negotiations finished. */
 298                 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
 299                 return NT_STATUS_INVALID_PARAMETER;
 300         }
 301
 302         *out = data_blob(NULL, 0);
 303
 304         if (!in.length && ntlmssp_state->stored_response.length) {
 305                 input = ntlmssp_state->stored_response;
 306
 307                 /* we only want to read the stored response once - overwrite it */
 308                 ntlmssp_state->stored_response = data_blob(NULL, 0);
 309         } else {
 310                 input = in;
 311         }
 312
 313         if (!input.length) {
 314                 switch (ntlmssp_state->role) {
 315                 case NTLMSSP_CLIENT:
 316                         ntlmssp_command = NTLMSSP_INITIAL;
 317                         break;
 318                 case NTLMSSP_SERVER:
 319                         /* 'datagram' mode - no neg packet */
 320                         ntlmssp_command = NTLMSSP_NEGOTIATE;
 321                         break;
 322                 }
 323         } else {
 324                 if (!msrpc_parse(&input, "Cd",
 325                                  "NTLMSSP",
 326                                  &ntlmssp_command)) {
 327                         DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
 328                         dump_data(2, (const char *)input.data, input.length);
 329                         return NT_STATUS_INVALID_PARAMETER;
 330                 }
 331         }
 332
 333         if (ntlmssp_command != ntlmssp_state->expected_state) {
 334                 DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
 335                 return NT_STATUS_INVALID_PARAMETER;
 336         }
 337
 338         for (i=0; ntlmssp_callbacks[i].fn; i++) {
 339                 if (ntlmssp_callbacks[i].role == ntlmssp_state->role
 340                     && ntlmssp_callbacks[i].ntlmssp_command == ntlmssp_command) {
 341                         return ntlmssp_callbacks[i].fn(ntlmssp_state, input, out);
 342                 }
 343         }
 344
 345         DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
 346                   ntlmssp_state->role, ntlmssp_command));
 347
 348         return NT_STATUS_INVALID_PARAMETER;
 349 }
 350
 351 /**
 352  * End an NTLMSSP state machine
 353  *
 354  * @param ntlmssp_state NTLMSSP State, free()ed by this function
 355  */
 356
 357 void ntlmssp_end(NTLMSSP_STATE **ntlmssp_state)
 358 {
 359         TALLOC_CTX *mem_ctx = (*ntlmssp_state)->mem_ctx;
 360
 361         (*ntlmssp_state)->ref_count--;
 362
 363         if ((*ntlmssp_state)->ref_count == 0) {
 364                 data_blob_free(&(*ntlmssp_state)->chal);
 365                 data_blob_free(&(*ntlmssp_state)->lm_resp);
 366                 data_blob_free(&(*ntlmssp_state)->nt_resp);
 367
 368                 talloc_destroy(mem_ctx);
 369         }
 370
 371         *ntlmssp_state = NULL;
 372         return;
 373 }
 374
 375 /**
 376  * Determine correct target name flags for reply, given server role
 377  * and negotiated flags
 378  *
 379  * @param ntlmssp_state NTLMSSP State
 380  * @param neg_flags The flags from the packet
 381  * @param chal_flags The flags to be set in the reply packet
 382  * @return The 'target name' string.
 383  */
 384
 385 static const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
 386                                        uint32 neg_flags, uint32 *chal_flags)
 387 {
 388         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
 389                 *chal_flags |= NTLMSSP_CHAL_TARGET_INFO;
 390                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
 391                 if (ntlmssp_state->server_role == ROLE_STANDALONE) {
 392                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
 393                         return ntlmssp_state->get_global_myname();
 394                 } else {
 395                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
 396                         return ntlmssp_state->get_domain();
 397                 };
 398         } else {
 399                 return "";
 400         }
 401 }
 402
 403 static void ntlmssp_handle_neg_flags(struct ntlmssp_state *ntlmssp_state,
 404                                       uint32 neg_flags, BOOL allow_lm) {
 405         if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
 406                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 407                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_OEM;
 408                 ntlmssp_state->unicode = True;
 409         } else {
 410                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_UNICODE;
 411                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 412                 ntlmssp_state->unicode = False;
 413         }
 414
 415         if ((neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && allow_lm) {
 416                 /* other end forcing us to use LM */
 417                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
 418                 ntlmssp_state->use_ntlmv2 = False;
 419         } else {
 420                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 421         }
 422
 423         if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN) {
 424                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 425         }
 426
 427         if (!(neg_flags & NTLMSSP_NEGOTIATE_NTLM2)) {
 428                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 429         }
 430
 431         if (!(neg_flags & NTLMSSP_NEGOTIATE_128)) {
 432                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_128;
 433         }
 434
 435         if (!(neg_flags & NTLMSSP_NEGOTIATE_56)) {
 436                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_56;
 437         }
 438
 439         if (!(neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)) {
 440                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_KEY_EXCH;
 441         }
 442
 443         if (!(neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
 444                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN;
 445         }
 446
 447         if (!(neg_flags & NTLMSSP_NEGOTIATE_SEAL)) {
 448                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SEAL;
 449         }
 450
 451         /* Woop Woop - unknown flag for Windows compatibility...
 452            What does this really do ? JRA. */
 453         if (!(neg_flags & NTLMSSP_UNKNOWN_02000000)) {
 454                 ntlmssp_state->neg_flags &= ~NTLMSSP_UNKNOWN_02000000;
 455         }
 456
 457         if ((neg_flags & NTLMSSP_REQUEST_TARGET)) {
 458                 ntlmssp_state->neg_flags |= NTLMSSP_REQUEST_TARGET;
 459         }
 460 }
 461
 462 /**
 463  Weaken NTLMSSP keys to cope with down-level clients and servers.
 464
 465  We probably should have some parameters to control this, but as
 466  it only occours for LM_KEY connections, and this is controlled
 467  by the client lanman auth/lanman auth parameters, it isn't too bad.
 468 */
 469
 470 DATA_BLOB ntlmssp_weaken_keys(NTLMSSP_STATE *ntlmssp_state, TALLOC_CTX *mem_ctx)
 471 {
 472         DATA_BLOB weakened_key = data_blob_talloc(mem_ctx,
 473                                         ntlmssp_state->session_key.data,
 474                                         ntlmssp_state->session_key.length);
 475
 476         /* Nothing to weaken.  We certainly don't want to 'extend' the length... */
 477         if (weakened_key.length < 16) {
 478                 /* perhaps there was no key? */
 479                 return weakened_key;
 480         }
 481
 482         /* Key weakening not performed on the master key for NTLM2
 483            and does not occour for NTLM1.  Therefore we only need
 484            to do this for the LM_KEY.
 485         */
 486
 487         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
 488                 /* LM key doesn't support 128 bit crypto, so this is
 489                  * the best we can do.  If you negotiate 128 bit, but
 490                  * not 56, you end up with 40 bit... */
 491                 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
 492                         weakened_key.data[7] = 0xa0;
 493                 } else { /* forty bits */
 494                         weakened_key.data[5] = 0xe5;
 495                         weakened_key.data[6] = 0x38;
 496                         weakened_key.data[7] = 0xb0;
 497                 }
 498                 weakened_key.length = 8;
 499         }
 500         return weakened_key;
 501 }
 502
 503 /**
 504  * Next state function for the Negotiate packet
 505  *
 506  * @param ntlmssp_state NTLMSSP State
 507  * @param request The request, as a DATA_BLOB
 508  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 509  * @return Errors or MORE_PROCESSING_REQUIRED if a reply is sent.
 510  */
 511
 512 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
 513                                          const DATA_BLOB request, DATA_BLOB *reply)
 514 {
 515         DATA_BLOB struct_blob;
 516         fstring dnsname, dnsdomname;
 517         uint32 neg_flags = 0;
 518         uint32 ntlmssp_command, chal_flags;
 519         const uint8 *cryptkey;
 520         const char *target_name;
 521
 522         /* parse the NTLMSSP packet */
 523 #if 0
 524         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 525 #endif
 526
 527         if (request.length) {
 528                 if ((request.length < 16) || !msrpc_parse(&request, "Cdd",
 529                                                         "NTLMSSP",
 530                                                         &ntlmssp_command,
 531                                                         &neg_flags)) {
 532                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
 533                                 (unsigned int)request.length));
 534                         dump_data(2, (const char *)request.data, request.length);
 535                         return NT_STATUS_INVALID_PARAMETER;
 536                 }
 537                 debug_ntlmssp_flags(neg_flags);
 538         }
 539
 540         ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, lp_lanman_auth());
 541
 542         /* Ask our caller what challenge they would like in the packet */
 543         cryptkey = ntlmssp_state->get_challenge(ntlmssp_state);
 544
 545         /* Check if we may set the challenge */
 546         if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
 547                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 548         }
 549
 550         /* The flags we send back are not just the negotiated flags,
 551          * they are also 'what is in this packet'.  Therfore, we
 552          * operate on 'chal_flags' from here on
 553          */
 554
 555         chal_flags = ntlmssp_state->neg_flags;
 556
 557         /* get the right name to fill in as 'target' */
 558         target_name = ntlmssp_target_name(ntlmssp_state,
 559                                           neg_flags, &chal_flags);
 560         if (target_name == NULL)
 561                 return NT_STATUS_INVALID_PARAMETER;
 562
 563         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, cryptkey, 8);
 564         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state->mem_ctx, cryptkey, 8);
 565
 566
 567         /* This should be a 'netbios domain -> DNS domain' mapping */
 568         dnsdomname[0] = '\0';
 569         get_mydnsdomname(dnsdomname);
 570         strlower_m(dnsdomname);
 571
 572         dnsname[0] = '\0';
 573         get_mydnsfullname(dnsname);
 574
 575         /* This creates the 'blob' of names that appears at the end of the packet */
 576         if (chal_flags & NTLMSSP_CHAL_TARGET_INFO)
 577         {
 578                 msrpc_gen(&struct_blob, "aaaaa",
 579                           NTLMSSP_NAME_TYPE_DOMAIN, target_name,
 580                           NTLMSSP_NAME_TYPE_SERVER, ntlmssp_state->get_global_myname(),
 581                           NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
 582                           NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
 583                           0, "");
 584         } else {
 585                 struct_blob = data_blob(NULL, 0);
 586         }
 587
 588         {
 589                 /* Marshel the packet in the right format, be it unicode or ASCII */
 590                 const char *gen_string;
 591                 if (ntlmssp_state->unicode) {
 592                         gen_string = "CdUdbddB";
 593                 } else {
 594                         gen_string = "CdAdbddB";
 595                 }
 596
 597                 msrpc_gen(reply, gen_string,
 598                           "NTLMSSP",
 599                           NTLMSSP_CHALLENGE,
 600                           target_name,
 601                           chal_flags,
 602                           cryptkey, 8,
 603                           0, 0,
 604                           struct_blob.data, struct_blob.length);
 605         }
 606
 607         data_blob_free(&struct_blob);
 608
 609         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 610
 611         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 612 }
 613
 614 /**
 615  * Next state function for the Authenticate packet
 616  *
 617  * @param ntlmssp_state NTLMSSP State
 618  * @param request The request, as a DATA_BLOB
 619  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 620  * @return Errors or NT_STATUS_OK.
 621  */
 622
 623 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
 624                                     const DATA_BLOB request, DATA_BLOB *reply)
 625 {
 626         DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
 627         DATA_BLOB user_session_key = data_blob(NULL, 0);
 628         DATA_BLOB lm_session_key = data_blob(NULL, 0);
 629         DATA_BLOB session_key = data_blob(NULL, 0);
 630         uint32 ntlmssp_command, auth_flags;
 631         NTSTATUS nt_status = NT_STATUS_OK;
 632
 633         /* used by NTLM2 */
 634         BOOL doing_ntlm2 = False;
 635
 636         uchar session_nonce[16];
 637         uchar session_nonce_hash[16];
 638
 639         const char *parse_string;
 640         char *domain = NULL;
 641         char *user = NULL;
 642         char *workstation = NULL;
 643
 644         /* parse the NTLMSSP packet */
 645         *reply = data_blob(NULL, 0);
 646
 647 #if 0
 648         file_save("ntlmssp_auth.dat", request.data, request.length);
 649 #endif
 650
 651         if (ntlmssp_state->unicode) {
 652                 parse_string = "CdBBUUUBd";
 653         } else {
 654                 parse_string = "CdBBAAABd";
 655         }
 656
 657         data_blob_free(&ntlmssp_state->lm_resp);
 658         data_blob_free(&ntlmssp_state->nt_resp);
 659
 660         ntlmssp_state->user = NULL;
 661         ntlmssp_state->domain = NULL;
 662         ntlmssp_state->workstation = NULL;
 663
 664         /* now the NTLMSSP encoded auth hashes */
 665         if (!msrpc_parse(&request, parse_string,
 666                          "NTLMSSP",
 667                          &ntlmssp_command,
 668                          &ntlmssp_state->lm_resp,
 669                          &ntlmssp_state->nt_resp,
 670                          &domain,
 671                          &user,
 672                          &workstation,
 673                          &encrypted_session_key,
 674                          &auth_flags)) {
 675                 SAFE_FREE(domain);
 676                 SAFE_FREE(user);
 677                 SAFE_FREE(workstation);
 678                 data_blob_free(&encrypted_session_key);
 679                 auth_flags = 0;
 680
 681                 /* Try again with a shorter string (Win9X truncates this packet) */
 682                 if (ntlmssp_state->unicode) {
 683                         parse_string = "CdBBUUU";
 684                 } else {
 685                         parse_string = "CdBBAAA";
 686                 }
 687
 688                 /* now the NTLMSSP encoded auth hashes */
 689                 if (!msrpc_parse(&request, parse_string,
 690                                  "NTLMSSP",
 691                                  &ntlmssp_command,
 692                                  &ntlmssp_state->lm_resp,
 693                                  &ntlmssp_state->nt_resp,
 694                                  &domain,
 695                                  &user,
 696                                  &workstation)) {
 697                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
 698                         dump_data(2, (const char *)request.data, request.length);
 699                         SAFE_FREE(domain);
 700                         SAFE_FREE(user);
 701                         SAFE_FREE(workstation);
 702
 703                         return NT_STATUS_INVALID_PARAMETER;
 704                 }
 705         }
 706
 707         if (auth_flags)
 708                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
 709
 710         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, domain))) {
 711                 SAFE_FREE(domain);
 712                 SAFE_FREE(user);
 713                 SAFE_FREE(workstation);
 714                 data_blob_free(&encrypted_session_key);
 715                 return nt_status;
 716         }
 717
 718         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(ntlmssp_state, user))) {
 719                 SAFE_FREE(domain);
 720                 SAFE_FREE(user);
 721                 SAFE_FREE(workstation);
 722                 data_blob_free(&encrypted_session_key);
 723                 return nt_status;
 724         }
 725
 726         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(ntlmssp_state, workstation))) {
 727                 SAFE_FREE(domain);
 728                 SAFE_FREE(user);
 729                 SAFE_FREE(workstation);
 730                 data_blob_free(&encrypted_session_key);
 731                 return nt_status;
 732         }
 733
 734         SAFE_FREE(domain);
 735         SAFE_FREE(user);
 736         SAFE_FREE(workstation);
 737
 738         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 739                  ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
 740
 741 #if 0
 742         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 743         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 744 #endif
 745
 746         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 747            client challenge
 748
 749            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 750         */
 751         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 752                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 753                         struct MD5Context md5_session_nonce_ctx;
 754                         SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
 755
 756                         doing_ntlm2 = True;
 757
 758                         memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
 759                         memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 760
 761                         MD5Init(&md5_session_nonce_ctx);
 762                         MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
 763                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 764
 765                         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, session_nonce_hash, 8);
 766
 767                         /* LM response is no longer useful */
 768                         data_blob_free(&ntlmssp_state->lm_resp);
 769
 770                         /* We changed the effective challenge - set it */
 771                         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
 772                                 data_blob_free(&encrypted_session_key);
 773                                 return nt_status;
 774                         }
 775
 776                         /* LM Key is incompatible. */
 777                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 778                 }
 779         }
 780
 781         /*
 782          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 783          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 784          * smb.conf file) and no NTLMv2 response was sent then the password check
 785          * will fail here. JRA.
 786          */
 787
 788         /* Finally, actually ask if the password is OK */
 789
 790         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
 791                                                                        &user_session_key, &lm_session_key))) {
 792                 data_blob_free(&encrypted_session_key);
 793                 return nt_status;
 794         }
 795
 796         dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
 797         dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
 798
 799         /* Handle the different session key derivation for NTLM2 */
 800         if (doing_ntlm2) {
 801                 if (user_session_key.data && user_session_key.length == 16) {
 802                         session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
 803                         hmac_md5(user_session_key.data, session_nonce,
 804                                  sizeof(session_nonce), session_key.data);
 805                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 806                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 807
 808                 } else {
 809                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 810                         session_key = data_blob(NULL, 0);
 811                 }
 812         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
 813                 if (lm_session_key.data && lm_session_key.length >= 8) {
 814                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 815                                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
 816                                 if (session_key.data == NULL) {
 817                                         return NT_STATUS_NO_MEMORY;
 818                                 }
 819                                 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
 820                                                           session_key.data);
 821                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 822                         } else {
 823                                 static const uint8 zeros[24] = { 0, };
 824                                 session_key = data_blob_talloc(
 825                                         ntlmssp_state->mem_ctx, NULL, 16);
 826                                 if (session_key.data == NULL) {
 827                                         return NT_STATUS_NO_MEMORY;
 828                                 }
 829                                 SMBsesskeygen_lm_sess_key(
 830                                         lm_session_key.data, zeros,
 831                                         session_key.data);
 832                         }
 833                         dump_data_pw("LM session key:\n", session_key.data,
 834                                      session_key.length);
 835                 } else {
 836                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 837                         session_key = data_blob(NULL, 0);
 838                 }
 839         } else if (user_session_key.data) {
 840                 session_key = user_session_key;
 841                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 842                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 843         } else if (lm_session_key.data) {
 844                 session_key = lm_session_key;
 845                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 846                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 847         } else {
 848                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 849                 session_key = data_blob(NULL, 0);
 850         }
 851
 852         /* With KEY_EXCH, the client supplies the proposed session key,
 853            but encrypts it with the long-term key */
 854         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 855                 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
 856                         data_blob_free(&encrypted_session_key);
 857                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 858                                   (unsigned int)encrypted_session_key.length));
 859                         return NT_STATUS_INVALID_PARAMETER;
 860                 } else if (!session_key.data || session_key.length != 16) {
 861                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 862                                   (unsigned int)session_key.length));
 863                         ntlmssp_state->session_key = session_key;
 864                 } else {
 865                         dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
 866                         SamOEMhash(encrypted_session_key.data,
 867                                    session_key.data,
 868                                    encrypted_session_key.length);
 869                         ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state->mem_ctx,
 870                                                                       encrypted_session_key.data,
 871                                                                       encrypted_session_key.length);
 872                         dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
 873                                      encrypted_session_key.length);
 874                 }
 875         } else {
 876                 ntlmssp_state->session_key = session_key;
 877         }
 878
 879         if (!NT_STATUS_IS_OK(nt_status)) {
 880                 ntlmssp_state->session_key = data_blob(NULL, 0);
 881         } else if (ntlmssp_state->session_key.length) {
 882                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 883         }
 884
 885         data_blob_free(&encrypted_session_key);
 886
 887         /* Only one authentication allowed per server state. */
 888         ntlmssp_state->expected_state = NTLMSSP_DONE;
 889
 890         return nt_status;
 891 }
 892
 893 /**
 894  * Create an NTLMSSP state machine
 895  *
 896  * @param ntlmssp_state NTLMSSP State, allocated by this function
 897  */
 898
 899 NTSTATUS ntlmssp_server_start(NTLMSSP_STATE **ntlmssp_state)
 900 {
 901         TALLOC_CTX *mem_ctx;
 902
 903         mem_ctx = talloc_init("NTLMSSP context");
 904
 905         *ntlmssp_state = TALLOC_ZERO_P(mem_ctx, NTLMSSP_STATE);
 906         if (!*ntlmssp_state) {
 907                 DEBUG(0,("ntlmssp_server_start: talloc failed!\n"));
 908                 talloc_destroy(mem_ctx);
 909                 return NT_STATUS_NO_MEMORY;
 910         }
 911
 912         (*ntlmssp_state)->role = NTLMSSP_SERVER;
 913
 914         (*ntlmssp_state)->mem_ctx = mem_ctx;
 915         (*ntlmssp_state)->get_challenge = get_challenge;
 916         (*ntlmssp_state)->set_challenge = set_challenge;
 917         (*ntlmssp_state)->may_set_challenge = may_set_challenge;
 918
 919         (*ntlmssp_state)->get_global_myname = global_myname;
 920         (*ntlmssp_state)->get_domain = lp_workgroup;
 921         (*ntlmssp_state)->server_role = ROLE_DOMAIN_MEMBER; /* a good default */
 922
 923         (*ntlmssp_state)->expected_state = NTLMSSP_NEGOTIATE;
 924
 925         (*ntlmssp_state)->ref_count = 1;
 926
 927         (*ntlmssp_state)->neg_flags =
 928                 NTLMSSP_NEGOTIATE_128 |
 929                 NTLMSSP_NEGOTIATE_56 |
 930                 NTLMSSP_UNKNOWN_02000000 |
 931                 NTLMSSP_NEGOTIATE_NTLM |
 932                 NTLMSSP_NEGOTIATE_NTLM2 |
 933                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 934                 NTLMSSP_NEGOTIATE_SIGN |
 935                 NTLMSSP_NEGOTIATE_SEAL;
 936
 937         return NT_STATUS_OK;
 938 }
 939
 940 /*********************************************************************
 941  Client side NTLMSSP
 942 *********************************************************************/
 943
 944 /**
 945  * Next state function for the Initial packet
 946  *
 947  * @param ntlmssp_state NTLMSSP State
 948  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 949  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 950  * @return Errors or NT_STATUS_OK.
 951  */
 952
 953 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
 954                                   DATA_BLOB reply, DATA_BLOB *next_request)
 955 {
 956         if (ntlmssp_state->unicode) {
 957                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 958         } else {
 959                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 960         }
 961
 962         if (ntlmssp_state->use_ntlmv2) {
 963                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 964         }
 965
 966         /* generate the ntlmssp negotiate packet */
 967         msrpc_gen(next_request, "CddAA",
 968                   "NTLMSSP",
 969                   NTLMSSP_NEGOTIATE,
 970                   ntlmssp_state->neg_flags,
 971                   ntlmssp_state->get_domain(),
 972                   ntlmssp_state->get_global_myname());
 973
 974         ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
 975
 976         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 977 }
 978
 979 /**
 980  * Next state function for the Challenge Packet.  Generate an auth packet.
 981  *
 982  * @param ntlmssp_state NTLMSSP State
 983  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 984  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 985  * @return Errors or NT_STATUS_OK.
 986  */
 987
 988 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
 989                                          const DATA_BLOB reply, DATA_BLOB *next_request)
 990 {
 991         uint32 chal_flags, ntlmssp_command, unkn1, unkn2;
 992         DATA_BLOB server_domain_blob;
 993         DATA_BLOB challenge_blob;
 994         DATA_BLOB struct_blob = data_blob(NULL, 0);
 995         char *server_domain;
 996         const char *chal_parse_string;
 997         const char *auth_gen_string;
 998         DATA_BLOB lm_response = data_blob(NULL, 0);
 999         DATA_BLOB nt_response = data_blob(NULL, 0);
1000         DATA_BLOB session_key = data_blob(NULL, 0);
1001         DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
1002         NTSTATUS nt_status = NT_STATUS_OK;
1003
1004         if (!msrpc_parse(&reply, "CdBd",
1005                          "NTLMSSP",
1006                          &ntlmssp_command,
1007                          &server_domain_blob,
1008                          &chal_flags)) {
1009                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
1010                 dump_data(2, (const char *)reply.data, reply.length);
1011
1012                 return NT_STATUS_INVALID_PARAMETER;
1013         }
1014
1015         data_blob_free(&server_domain_blob);
1016
1017         DEBUG(3, ("Got challenge flags:\n"));
1018         debug_ntlmssp_flags(chal_flags);
1019
1020         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
1021
1022         if (ntlmssp_state->unicode) {
1023                 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
1024                         chal_parse_string = "CdUdbddB";
1025                 } else {
1026                         chal_parse_string = "CdUdbdd";
1027                 }
1028                 auth_gen_string = "CdBBUUUBd";
1029         } else {
1030                 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
1031                         chal_parse_string = "CdAdbddB";
1032                 } else {
1033                         chal_parse_string = "CdAdbdd";
1034                 }
1035
1036                 auth_gen_string = "CdBBAAABd";
1037         }
1038
1039         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
1040         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
1041
1042         if (!msrpc_parse(&reply, chal_parse_string,
1043                          "NTLMSSP",
1044                          &ntlmssp_command,
1045                          &server_domain,
1046                          &chal_flags,
1047                          &challenge_blob, 8,
1048                          &unkn1, &unkn2,
1049                          &struct_blob)) {
1050                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
1051                 dump_data(2, (const char *)reply.data, reply.length);
1052                 return NT_STATUS_INVALID_PARAMETER;
1053         }
1054
1055         ntlmssp_state->server_domain = talloc_strdup(ntlmssp_state->mem_ctx,
1056                                                      server_domain);
1057
1058         SAFE_FREE(server_domain);
1059         if (challenge_blob.length != 8) {
1060                 data_blob_free(&struct_blob);
1061                 return NT_STATUS_INVALID_PARAMETER;
1062         }
1063
1064         if (!ntlmssp_state->nt_hash || !ntlmssp_state->lm_hash) {
1065                 static const uchar zeros[16] = { 0, };
1066                 /* do nothing - blobs are zero length */
1067
1068                 /* session key is all zeros */
1069                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, zeros, 16);
1070
1071                 /* not doing NLTM2 without a password */
1072                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
1073         } else if (ntlmssp_state->use_ntlmv2) {
1074
1075                 if (!struct_blob.length) {
1076                         /* be lazy, match win2k - we can't do NTLMv2 without it */
1077                         DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
1078                         return NT_STATUS_INVALID_PARAMETER;
1079                 }
1080
1081                 /* TODO: if the remote server is standalone, then we should replace 'domain'
1082                    with the server name as supplied above */
1083
1084                 if (!SMBNTLMv2encrypt_hash(ntlmssp_state->user,
1085                                       ntlmssp_state->domain,
1086                                       ntlmssp_state->nt_hash, &challenge_blob,
1087                                       &struct_blob,
1088                                       &lm_response, &nt_response, &session_key)) {
1089                         data_blob_free(&challenge_blob);
1090                         data_blob_free(&struct_blob);
1091                         return NT_STATUS_NO_MEMORY;
1092                 }
1093         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
1094                 struct MD5Context md5_session_nonce_ctx;
1095                 uchar session_nonce[16];
1096                 uchar session_nonce_hash[16];
1097                 uchar user_session_key[16];
1098
1099                 lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1100                 generate_random_buffer(lm_response.data, 8);
1101                 memset(lm_response.data+8, 0, 16);
1102
1103                 memcpy(session_nonce, challenge_blob.data, 8);
1104                 memcpy(&session_nonce[8], lm_response.data, 8);
1105
1106                 MD5Init(&md5_session_nonce_ctx);
1107                 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
1108                 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
1109                 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
1110
1111                 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
1112                 DEBUG(5, ("challenge is: \n"));
1113                 dump_data(5, (const char *)session_nonce_hash, 8);
1114
1115                 nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1116                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,
1117                              session_nonce_hash,
1118                              nt_response.data);
1119
1120                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
1121
1122                 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, NULL, user_session_key);
1123                 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
1124                 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
1125         } else {
1126                 /* lanman auth is insecure, it may be disabled */
1127                 if (lp_client_lanman_auth()) {
1128                         lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1129                         SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
1130                                    lm_response.data);
1131                 }
1132
1133                 nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1134                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
1135                              nt_response.data);
1136
1137                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
1138                 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
1139                     && lp_client_lanman_auth()) {
1140                         SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
1141                                         session_key.data);
1142                         dump_data_pw("LM session key\n", session_key.data, session_key.length);
1143                 } else {
1144                         SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, NULL, session_key.data);
1145                         dump_data_pw("NT session key:\n", session_key.data, session_key.length);
1146                 }
1147         }
1148         data_blob_free(&struct_blob);
1149
1150         /* Key exchange encryptes a new client-generated session key with
1151            the password-derived key */
1152         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
1153                 /* Make up a new session key */
1154                 uint8 client_session_key[16];
1155                 generate_random_buffer(client_session_key, sizeof(client_session_key));
1156
1157                 /* Encrypt the new session key with the old one */
1158                 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
1159                 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
1160                 SamOEMhash(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
1161                 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
1162
1163                 /* Mark the new session key as the 'real' session key */
1164                 data_blob_free(&session_key);
1165                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, client_session_key, sizeof(client_session_key));
1166         }
1167
1168         /* this generates the actual auth packet */
1169         if (!msrpc_gen(next_request, auth_gen_string,
1170                        "NTLMSSP",
1171                        NTLMSSP_AUTH,
1172                        lm_response.data, lm_response.length,
1173                        nt_response.data, nt_response.length,
1174                        ntlmssp_state->domain,
1175                        ntlmssp_state->user,
1176                        ntlmssp_state->get_global_myname(),
1177                        encrypted_session_key.data, encrypted_session_key.length,
1178                        ntlmssp_state->neg_flags)) {
1179
1180                 return NT_STATUS_NO_MEMORY;
1181         }
1182
1183         data_blob_free(&encrypted_session_key);
1184
1185         data_blob_free(&ntlmssp_state->chal);
1186
1187         ntlmssp_state->session_key = session_key;
1188
1189         ntlmssp_state->chal = challenge_blob;
1190         ntlmssp_state->lm_resp = lm_response;
1191         ntlmssp_state->nt_resp = nt_response;
1192
1193         ntlmssp_state->expected_state = NTLMSSP_DONE;
1194
1195         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
1196                 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
1197         }
1198
1199         return nt_status;
1200 }
1201
1202 NTSTATUS ntlmssp_client_start(NTLMSSP_STATE **ntlmssp_state)
1203 {
1204         TALLOC_CTX *mem_ctx;
1205
1206         mem_ctx = talloc_init("NTLMSSP Client context");
1207
1208         *ntlmssp_state = TALLOC_ZERO_P(mem_ctx, NTLMSSP_STATE);
1209         if (!*ntlmssp_state) {
1210                 DEBUG(0,("ntlmssp_client_start: talloc failed!\n"));
1211                 talloc_destroy(mem_ctx);
1212                 return NT_STATUS_NO_MEMORY;
1213         }
1214
1215         (*ntlmssp_state)->role = NTLMSSP_CLIENT;
1216
1217         (*ntlmssp_state)->mem_ctx = mem_ctx;
1218
1219         (*ntlmssp_state)->get_global_myname = global_myname;
1220         (*ntlmssp_state)->get_domain = lp_workgroup;
1221
1222         (*ntlmssp_state)->unicode = True;
1223
1224         (*ntlmssp_state)->use_ntlmv2 = lp_client_ntlmv2_auth();
1225
1226         (*ntlmssp_state)->expected_state = NTLMSSP_INITIAL;
1227
1228         (*ntlmssp_state)->ref_count = 1;
1229
1230         (*ntlmssp_state)->neg_flags =
1231                 NTLMSSP_NEGOTIATE_128 |
1232                 NTLMSSP_NEGOTIATE_NTLM |
1233                 NTLMSSP_NEGOTIATE_NTLM2 |
1234                 NTLMSSP_NEGOTIATE_KEY_EXCH |
1235                 NTLMSSP_REQUEST_TARGET;
1236
1237         return NT_STATUS_OK;
1238 }