source3/libsmb/ntlmssp.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    handle NLTMSSP, server side
   5
   6    Copyright (C) Andrew Tridgell      2001
   7    Copyright (C) Andrew Bartlett 2001-2003
   8    Copyright (C) Andrew Bartlett 2005 (Updated from gensec).
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25
  26 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
  27                                        DATA_BLOB reply, DATA_BLOB *next_request);
  28 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
  29                                          const DATA_BLOB in, DATA_BLOB *out);
  30 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
  31                                          const DATA_BLOB reply, DATA_BLOB *next_request);
  32 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
  33                                     const DATA_BLOB request, DATA_BLOB *reply);
  34
  35 /**
  36  * Callbacks for NTLMSSP - for both client and server operating modes
  37  *
  38  */
  39
  40 static const struct ntlmssp_callbacks {
  41         enum NTLMSSP_ROLE role;
  42         enum NTLM_MESSAGE_TYPE ntlmssp_command;
  43         NTSTATUS (*fn)(struct ntlmssp_state *ntlmssp_state,
  44                        DATA_BLOB in, DATA_BLOB *out);
  45 } ntlmssp_callbacks[] = {
  46         {NTLMSSP_CLIENT, NTLMSSP_INITIAL, ntlmssp_client_initial},
  47         {NTLMSSP_SERVER, NTLMSSP_NEGOTIATE, ntlmssp_server_negotiate},
  48         {NTLMSSP_CLIENT, NTLMSSP_CHALLENGE, ntlmssp_client_challenge},
  49         {NTLMSSP_SERVER, NTLMSSP_AUTH, ntlmssp_server_auth},
  50         {NTLMSSP_CLIENT, NTLMSSP_UNKNOWN, NULL},
  51         {NTLMSSP_SERVER, NTLMSSP_UNKNOWN, NULL}
  52 };
  53
  54
  55 /**
  56  * Print out the NTLMSSP flags for debugging
  57  * @param neg_flags The flags from the packet
  58  */
  59
  60 void debug_ntlmssp_flags(uint32 neg_flags)
  61 {
  62         DEBUG(3,("Got NTLMSSP neg_flags=0x%08x\n", neg_flags));
  63
  64         if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE)
  65                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_UNICODE\n"));
  66         if (neg_flags & NTLMSSP_NEGOTIATE_OEM)
  67                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_OEM\n"));
  68         if (neg_flags & NTLMSSP_REQUEST_TARGET)
  69                 DEBUGADD(4, ("  NTLMSSP_REQUEST_TARGET\n"));
  70         if (neg_flags & NTLMSSP_NEGOTIATE_SIGN)
  71                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_SIGN\n"));
  72         if (neg_flags & NTLMSSP_NEGOTIATE_SEAL)
  73                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_SEAL\n"));
  74         if (neg_flags & NTLMSSP_NEGOTIATE_DATAGRAM_STYLE)
  75                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_DATAGRAM_STYLE\n"));
  76         if (neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
  77                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_LM_KEY\n"));
  78         if (neg_flags & NTLMSSP_NEGOTIATE_NETWARE)
  79                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_NETWARE\n"));
  80         if (neg_flags & NTLMSSP_NEGOTIATE_NTLM)
  81                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_NTLM\n"));
  82         if (neg_flags & NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED)
  83                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED\n"));
  84         if (neg_flags & NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED)
  85                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED\n"));
  86         if (neg_flags & NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL)
  87                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL\n"));
  88         if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
  89                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_ALWAYS_SIGN\n"));
  90         if (neg_flags & NTLMSSP_CHAL_ACCEPT_RESPONSE)
  91                 DEBUGADD(4, ("  NTLMSSP_CHAL_ACCEPT_RESPONSE\n"));
  92         if (neg_flags & NTLMSSP_CHAL_NON_NT_SESSION_KEY)
  93                 DEBUGADD(4, ("  NTLMSSP_CHAL_NON_NT_SESSION_KEY\n"));
  94         if (neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
  95                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_NTLM2\n"));
  96         if (neg_flags & NTLMSSP_CHAL_TARGET_INFO)
  97                 DEBUGADD(4, ("  NTLMSSP_CHAL_TARGET_INFO\n"));
  98         if (neg_flags & NTLMSSP_NEGOTIATE_VERSION)
  99                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_VERSION\n"));
 100         if (neg_flags & NTLMSSP_NEGOTIATE_128)
 101                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_128\n"));
 102         if (neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)
 103                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_KEY_EXCH\n"));
 104         if (neg_flags & NTLMSSP_NEGOTIATE_56)
 105                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_56\n"));
 106 }
 107
 108 /**
 109  * Default challenge generation code.
 110  *
 111  */
 112
 113 static const uint8 *get_challenge(const struct ntlmssp_state *ntlmssp_state)
 114 {
 115         static uchar chal[8];
 116         generate_random_buffer(chal, sizeof(chal));
 117
 118         return chal;
 119 }
 120
 121 /**
 122  * Default 'we can set the challenge to anything we like' implementation
 123  *
 124  */
 125
 126 static bool may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
 127 {
 128         return True;
 129 }
 130
 131 /**
 132  * Default 'we can set the challenge to anything we like' implementation
 133  *
 134  * Does not actually do anything, as the value is always in the structure anyway.
 135  *
 136  */
 137
 138 static NTSTATUS set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
 139 {
 140         SMB_ASSERT(challenge->length == 8);
 141         return NT_STATUS_OK;
 142 }
 143
 144 /**
 145  * Set a username on an NTLMSSP context - ensures it is talloc()ed
 146  *
 147  */
 148
 149 NTSTATUS ntlmssp_set_username(NTLMSSP_STATE *ntlmssp_state, const char *user)
 150 {
 151         ntlmssp_state->user = talloc_strdup(ntlmssp_state, user ? user : "" );
 152         if (!ntlmssp_state->user) {
 153                 return NT_STATUS_NO_MEMORY;
 154         }
 155         return NT_STATUS_OK;
 156 }
 157
 158 /**
 159  * Store NT and LM hashes on an NTLMSSP context - ensures they are talloc()ed
 160  *
 161  */
 162 NTSTATUS ntlmssp_set_hashes(NTLMSSP_STATE *ntlmssp_state,
 163                 const unsigned char lm_hash[16],
 164                 const unsigned char nt_hash[16])
 165 {
 166         ntlmssp_state->lm_hash = (unsigned char *)
 167                 TALLOC_MEMDUP(ntlmssp_state, lm_hash, 16);
 168         ntlmssp_state->nt_hash = (unsigned char *)
 169                 TALLOC_MEMDUP(ntlmssp_state, nt_hash, 16);
 170         if (!ntlmssp_state->lm_hash || !ntlmssp_state->nt_hash) {
 171                 TALLOC_FREE(ntlmssp_state->lm_hash);
 172                 TALLOC_FREE(ntlmssp_state->nt_hash);
 173                 return NT_STATUS_NO_MEMORY;
 174         }
 175         return NT_STATUS_OK;
 176 }
 177
 178 /**
 179  * Converts a password to the hashes on an NTLMSSP context.
 180  *
 181  */
 182 NTSTATUS ntlmssp_set_password(NTLMSSP_STATE *ntlmssp_state, const char *password)
 183 {
 184         if (!password) {
 185                 ntlmssp_state->lm_hash = NULL;
 186                 ntlmssp_state->nt_hash = NULL;
 187         } else {
 188                 unsigned char lm_hash[16];
 189                 unsigned char nt_hash[16];
 190
 191                 E_deshash(password, lm_hash);
 192                 E_md4hash(password, nt_hash);
 193                 return ntlmssp_set_hashes(ntlmssp_state, lm_hash, nt_hash);
 194         }
 195         return NT_STATUS_OK;
 196 }
 197
 198 /**
 199  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
 200  *
 201  */
 202 NTSTATUS ntlmssp_set_domain(NTLMSSP_STATE *ntlmssp_state, const char *domain)
 203 {
 204         ntlmssp_state->domain = talloc_strdup(ntlmssp_state,
 205                                               domain ? domain : "" );
 206         if (!ntlmssp_state->domain) {
 207                 return NT_STATUS_NO_MEMORY;
 208         }
 209         return NT_STATUS_OK;
 210 }
 211
 212 /**
 213  * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
 214  *
 215  */
 216 NTSTATUS ntlmssp_set_workstation(NTLMSSP_STATE *ntlmssp_state, const char *workstation)
 217 {
 218         ntlmssp_state->workstation = talloc_strdup(ntlmssp_state, workstation);
 219         if (!ntlmssp_state->workstation) {
 220                 return NT_STATUS_NO_MEMORY;
 221         }
 222         return NT_STATUS_OK;
 223 }
 224
 225 /**
 226  *  Store a DATA_BLOB containing an NTLMSSP response, for use later.
 227  *  This copies the data blob
 228  */
 229
 230 NTSTATUS ntlmssp_store_response(NTLMSSP_STATE *ntlmssp_state,
 231                                 DATA_BLOB response)
 232 {
 233         ntlmssp_state->stored_response = data_blob_talloc(ntlmssp_state,
 234                                                           response.data,
 235                                                           response.length);
 236         return NT_STATUS_OK;
 237 }
 238
 239 /**
 240  * Request features for the NTLMSSP negotiation
 241  *
 242  * @param ntlmssp_state NTLMSSP state
 243  * @param feature_list List of space seperated features requested from NTLMSSP.
 244  */
 245 void ntlmssp_want_feature_list(NTLMSSP_STATE *ntlmssp_state, char *feature_list)
 246 {
 247         /*
 248          * We need to set this to allow a later SetPassword
 249          * via the SAMR pipe to succeed. Strange.... We could
 250          * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
 251          */
 252         if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, True)) {
 253                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 254         }
 255         if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, True)) {
 256                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 257         }
 258         if(in_list("NTLMSSP_FEATURE_SEAL", feature_list, True)) {
 259                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 260         }
 261 }
 262
 263 /**
 264  * Request a feature for the NTLMSSP negotiation
 265  *
 266  * @param ntlmssp_state NTLMSSP state
 267  * @param feature Bit flag specifying the requested feature
 268  */
 269 void ntlmssp_want_feature(NTLMSSP_STATE *ntlmssp_state, uint32 feature)
 270 {
 271         /* As per JRA's comment above */
 272         if (feature & NTLMSSP_FEATURE_SESSION_KEY) {
 273                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 274         }
 275         if (feature & NTLMSSP_FEATURE_SIGN) {
 276                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 277         }
 278         if (feature & NTLMSSP_FEATURE_SEAL) {
 279                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 280         }
 281 }
 282
 283 /**
 284  * Next state function for the NTLMSSP state machine
 285  *
 286  * @param ntlmssp_state NTLMSSP State
 287  * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
 288  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 289  * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
 290  */
 291
 292 NTSTATUS ntlmssp_update(NTLMSSP_STATE *ntlmssp_state,
 293                         const DATA_BLOB in, DATA_BLOB *out)
 294 {
 295         DATA_BLOB input;
 296         uint32 ntlmssp_command;
 297         int i;
 298
 299         if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
 300                 /* Called update after negotiations finished. */
 301                 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
 302                 return NT_STATUS_INVALID_PARAMETER;
 303         }
 304
 305         *out = data_blob_null;
 306
 307         if (!in.length && ntlmssp_state->stored_response.length) {
 308                 input = ntlmssp_state->stored_response;
 309
 310                 /* we only want to read the stored response once - overwrite it */
 311                 ntlmssp_state->stored_response = data_blob_null;
 312         } else {
 313                 input = in;
 314         }
 315
 316         if (!input.length) {
 317                 switch (ntlmssp_state->role) {
 318                 case NTLMSSP_CLIENT:
 319                         ntlmssp_command = NTLMSSP_INITIAL;
 320                         break;
 321                 case NTLMSSP_SERVER:
 322                         /* 'datagram' mode - no neg packet */
 323                         ntlmssp_command = NTLMSSP_NEGOTIATE;
 324                         break;
 325                 }
 326         } else {
 327                 if (!msrpc_parse(&input, "Cd",
 328                                  "NTLMSSP",
 329                                  &ntlmssp_command)) {
 330                         DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
 331                         dump_data(2, input.data, input.length);
 332                         return NT_STATUS_INVALID_PARAMETER;
 333                 }
 334         }
 335
 336         if (ntlmssp_command != ntlmssp_state->expected_state) {
 337                 DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
 338                 return NT_STATUS_INVALID_PARAMETER;
 339         }
 340
 341         for (i=0; ntlmssp_callbacks[i].fn; i++) {
 342                 if (ntlmssp_callbacks[i].role == ntlmssp_state->role
 343                     && ntlmssp_callbacks[i].ntlmssp_command == ntlmssp_command) {
 344                         return ntlmssp_callbacks[i].fn(ntlmssp_state, input, out);
 345                 }
 346         }
 347
 348         DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
 349                   ntlmssp_state->role, ntlmssp_command));
 350
 351         return NT_STATUS_INVALID_PARAMETER;
 352 }
 353
 354 /**
 355  * End an NTLMSSP state machine
 356  *
 357  * @param ntlmssp_state NTLMSSP State, free()ed by this function
 358  */
 359
 360 void ntlmssp_end(NTLMSSP_STATE **ntlmssp_state)
 361 {
 362         (*ntlmssp_state)->ref_count--;
 363
 364         if ((*ntlmssp_state)->ref_count == 0) {
 365                 data_blob_free(&(*ntlmssp_state)->chal);
 366                 data_blob_free(&(*ntlmssp_state)->lm_resp);
 367                 data_blob_free(&(*ntlmssp_state)->nt_resp);
 368                 TALLOC_FREE(*ntlmssp_state);
 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_NEGOTIATE_VERSION)) {
 454                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_VERSION;
 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         const char *dnsname;
 517         char *dnsdomname = NULL;
 518         uint32 neg_flags = 0;
 519         uint32 ntlmssp_command, chal_flags;
 520         const uint8 *cryptkey;
 521         const char *target_name;
 522
 523         /* parse the NTLMSSP packet */
 524 #if 0
 525         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 526 #endif
 527
 528         if (request.length) {
 529                 if ((request.length < 16) || !msrpc_parse(&request, "Cdd",
 530                                                         "NTLMSSP",
 531                                                         &ntlmssp_command,
 532                                                         &neg_flags)) {
 533                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
 534                                 (unsigned int)request.length));
 535                         dump_data(2, request.data, request.length);
 536                         return NT_STATUS_INVALID_PARAMETER;
 537                 }
 538                 debug_ntlmssp_flags(neg_flags);
 539         }
 540
 541         ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, lp_lanman_auth());
 542
 543         /* Ask our caller what challenge they would like in the packet */
 544         cryptkey = ntlmssp_state->get_challenge(ntlmssp_state);
 545
 546         /* Check if we may set the challenge */
 547         if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
 548                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 549         }
 550
 551         /* The flags we send back are not just the negotiated flags,
 552          * they are also 'what is in this packet'.  Therfore, we
 553          * operate on 'chal_flags' from here on
 554          */
 555
 556         chal_flags = ntlmssp_state->neg_flags;
 557
 558         /* get the right name to fill in as 'target' */
 559         target_name = ntlmssp_target_name(ntlmssp_state,
 560                                           neg_flags, &chal_flags);
 561         if (target_name == NULL)
 562                 return NT_STATUS_INVALID_PARAMETER;
 563
 564         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
 565         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state,
 566                                                         cryptkey, 8);
 567
 568         /* This should be a 'netbios domain -> DNS domain' mapping */
 569         dnsdomname = get_mydnsdomname(ntlmssp_state);
 570         if (!dnsdomname) {
 571                 dnsdomname = talloc_strdup(ntlmssp_state, "");
 572         }
 573         if (!dnsdomname) {
 574                 return NT_STATUS_NO_MEMORY;
 575         }
 576         strlower_m(dnsdomname);
 577
 578         dnsname = get_mydnsfullname();
 579         if (!dnsname) {
 580                 dnsname = "";
 581         }
 582
 583         /* This creates the 'blob' of names that appears at the end of the packet */
 584         if (chal_flags & NTLMSSP_CHAL_TARGET_INFO)
 585         {
 586                 msrpc_gen(&struct_blob, "aaaaa",
 587                           NTLMSSP_NAME_TYPE_DOMAIN, target_name,
 588                           NTLMSSP_NAME_TYPE_SERVER, ntlmssp_state->get_global_myname(),
 589                           NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
 590                           NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
 591                           0, "");
 592         } else {
 593                 struct_blob = data_blob_null;
 594         }
 595
 596         {
 597                 /* Marshel the packet in the right format, be it unicode or ASCII */
 598                 const char *gen_string;
 599                 if (ntlmssp_state->unicode) {
 600                         gen_string = "CdUdbddB";
 601                 } else {
 602                         gen_string = "CdAdbddB";
 603                 }
 604
 605                 msrpc_gen(reply, gen_string,
 606                           "NTLMSSP",
 607                           NTLMSSP_CHALLENGE,
 608                           target_name,
 609                           chal_flags,
 610                           cryptkey, 8,
 611                           0, 0,
 612                           struct_blob.data, struct_blob.length);
 613         }
 614
 615         data_blob_free(&struct_blob);
 616
 617         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 618
 619         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 620 }
 621
 622 /**
 623  * Next state function for the Authenticate packet
 624  *
 625  * @param ntlmssp_state NTLMSSP State
 626  * @param request The request, as a DATA_BLOB
 627  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 628  * @return Errors or NT_STATUS_OK.
 629  */
 630
 631 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
 632                                     const DATA_BLOB request, DATA_BLOB *reply)
 633 {
 634         DATA_BLOB encrypted_session_key = data_blob_null;
 635         DATA_BLOB user_session_key = data_blob_null;
 636         DATA_BLOB lm_session_key = data_blob_null;
 637         DATA_BLOB session_key = data_blob_null;
 638         uint32 ntlmssp_command, auth_flags;
 639         NTSTATUS nt_status = NT_STATUS_OK;
 640
 641         /* used by NTLM2 */
 642         bool doing_ntlm2 = False;
 643
 644         uchar session_nonce[16];
 645         uchar session_nonce_hash[16];
 646
 647         const char *parse_string;
 648         char *domain = NULL;
 649         char *user = NULL;
 650         char *workstation = NULL;
 651
 652         /* parse the NTLMSSP packet */
 653         *reply = data_blob_null;
 654
 655 #if 0
 656         file_save("ntlmssp_auth.dat", request.data, request.length);
 657 #endif
 658
 659         if (ntlmssp_state->unicode) {
 660                 parse_string = "CdBBUUUBd";
 661         } else {
 662                 parse_string = "CdBBAAABd";
 663         }
 664
 665         data_blob_free(&ntlmssp_state->lm_resp);
 666         data_blob_free(&ntlmssp_state->nt_resp);
 667
 668         ntlmssp_state->user = NULL;
 669         ntlmssp_state->domain = NULL;
 670         ntlmssp_state->workstation = NULL;
 671
 672         /* now the NTLMSSP encoded auth hashes */
 673         if (!msrpc_parse(&request, parse_string,
 674                          "NTLMSSP",
 675                          &ntlmssp_command,
 676                          &ntlmssp_state->lm_resp,
 677                          &ntlmssp_state->nt_resp,
 678                          &domain,
 679                          &user,
 680                          &workstation,
 681                          &encrypted_session_key,
 682                          &auth_flags)) {
 683                 SAFE_FREE(domain);
 684                 SAFE_FREE(user);
 685                 SAFE_FREE(workstation);
 686                 data_blob_free(&encrypted_session_key);
 687                 auth_flags = 0;
 688
 689                 /* Try again with a shorter string (Win9X truncates this packet) */
 690                 if (ntlmssp_state->unicode) {
 691                         parse_string = "CdBBUUU";
 692                 } else {
 693                         parse_string = "CdBBAAA";
 694                 }
 695
 696                 /* now the NTLMSSP encoded auth hashes */
 697                 if (!msrpc_parse(&request, parse_string,
 698                                  "NTLMSSP",
 699                                  &ntlmssp_command,
 700                                  &ntlmssp_state->lm_resp,
 701                                  &ntlmssp_state->nt_resp,
 702                                  &domain,
 703                                  &user,
 704                                  &workstation)) {
 705                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
 706                         dump_data(2, request.data, request.length);
 707                         SAFE_FREE(domain);
 708                         SAFE_FREE(user);
 709                         SAFE_FREE(workstation);
 710
 711                         return NT_STATUS_INVALID_PARAMETER;
 712                 }
 713         }
 714
 715         if (auth_flags)
 716                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
 717
 718         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, domain))) {
 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_username(ntlmssp_state, user))) {
 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         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(ntlmssp_state, workstation))) {
 735                 SAFE_FREE(domain);
 736                 SAFE_FREE(user);
 737                 SAFE_FREE(workstation);
 738                 data_blob_free(&encrypted_session_key);
 739                 return nt_status;
 740         }
 741
 742         SAFE_FREE(domain);
 743         SAFE_FREE(user);
 744         SAFE_FREE(workstation);
 745
 746         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 747                  ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
 748
 749 #if 0
 750         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 751         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 752 #endif
 753
 754         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 755            client challenge
 756
 757            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 758         */
 759         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 760                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 761                         struct MD5Context md5_session_nonce_ctx;
 762                         SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
 763
 764                         doing_ntlm2 = True;
 765
 766                         memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
 767                         memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 768
 769                         MD5Init(&md5_session_nonce_ctx);
 770                         MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
 771                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 772
 773                         ntlmssp_state->chal = data_blob_talloc(
 774                                 ntlmssp_state, session_nonce_hash, 8);
 775
 776                         /* LM response is no longer useful */
 777                         data_blob_free(&ntlmssp_state->lm_resp);
 778
 779                         /* We changed the effective challenge - set it */
 780                         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
 781                                 data_blob_free(&encrypted_session_key);
 782                                 return nt_status;
 783                         }
 784
 785                         /* LM Key is incompatible. */
 786                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 787                 }
 788         }
 789
 790         /*
 791          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 792          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 793          * smb.conf file) and no NTLMv2 response was sent then the password check
 794          * will fail here. JRA.
 795          */
 796
 797         /* Finally, actually ask if the password is OK */
 798
 799         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
 800                                                                        &user_session_key, &lm_session_key))) {
 801                 data_blob_free(&encrypted_session_key);
 802                 return nt_status;
 803         }
 804
 805         dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
 806         dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
 807
 808         /* Handle the different session key derivation for NTLM2 */
 809         if (doing_ntlm2) {
 810                 if (user_session_key.data && user_session_key.length == 16) {
 811                         session_key = data_blob_talloc(ntlmssp_state,
 812                                                        NULL, 16);
 813                         hmac_md5(user_session_key.data, session_nonce,
 814                                  sizeof(session_nonce), session_key.data);
 815                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 816                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 817
 818                 } else {
 819                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 820                         session_key = data_blob_null;
 821                 }
 822         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
 823                 if (lm_session_key.data && lm_session_key.length >= 8) {
 824                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 825                                 session_key = data_blob_talloc(ntlmssp_state,
 826                                                                NULL, 16);
 827                                 if (session_key.data == NULL) {
 828                                         return NT_STATUS_NO_MEMORY;
 829                                 }
 830                                 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
 831                                                           session_key.data);
 832                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 833                         } else {
 834                                 uint8 zeros[24];
 835                                 ZERO_STRUCT(zeros);
 836                                 session_key = data_blob_talloc(
 837                                         ntlmssp_state, NULL, 16);
 838                                 if (session_key.data == NULL) {
 839                                         return NT_STATUS_NO_MEMORY;
 840                                 }
 841                                 SMBsesskeygen_lm_sess_key(
 842                                         lm_session_key.data, zeros,
 843                                         session_key.data);
 844                         }
 845                         dump_data_pw("LM session key:\n", session_key.data,
 846                                      session_key.length);
 847                 } else {
 848                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 849                         session_key = data_blob_null;
 850                 }
 851         } else if (user_session_key.data) {
 852                 session_key = user_session_key;
 853                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 854                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 855         } else if (lm_session_key.data) {
 856                 session_key = lm_session_key;
 857                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 858                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 859         } else {
 860                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 861                 session_key = data_blob_null;
 862         }
 863
 864         /* With KEY_EXCH, the client supplies the proposed session key,
 865            but encrypts it with the long-term key */
 866         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 867                 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
 868                         data_blob_free(&encrypted_session_key);
 869                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 870                                   (unsigned int)encrypted_session_key.length));
 871                         return NT_STATUS_INVALID_PARAMETER;
 872                 } else if (!session_key.data || session_key.length != 16) {
 873                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 874                                   (unsigned int)session_key.length));
 875                         ntlmssp_state->session_key = session_key;
 876                 } else {
 877                         dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
 878                         SamOEMhash(encrypted_session_key.data,
 879                                    session_key.data,
 880                                    encrypted_session_key.length);
 881                         ntlmssp_state->session_key = data_blob_talloc(
 882                                 ntlmssp_state, encrypted_session_key.data,
 883                                 encrypted_session_key.length);
 884                         dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
 885                                      encrypted_session_key.length);
 886                 }
 887         } else {
 888                 ntlmssp_state->session_key = session_key;
 889         }
 890
 891         if (!NT_STATUS_IS_OK(nt_status)) {
 892                 ntlmssp_state->session_key = data_blob_null;
 893         } else if (ntlmssp_state->session_key.length) {
 894                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 895         }
 896
 897         data_blob_free(&encrypted_session_key);
 898
 899         /* Only one authentication allowed per server state. */
 900         ntlmssp_state->expected_state = NTLMSSP_DONE;
 901
 902         return nt_status;
 903 }
 904
 905 /**
 906  * Create an NTLMSSP state machine
 907  *
 908  * @param ntlmssp_state NTLMSSP State, allocated by this function
 909  */
 910
 911 NTSTATUS ntlmssp_server_start(NTLMSSP_STATE **ntlmssp_state)
 912 {
 913         *ntlmssp_state = TALLOC_ZERO_P(NULL, NTLMSSP_STATE);
 914         if (!*ntlmssp_state) {
 915                 DEBUG(0,("ntlmssp_server_start: talloc failed!\n"));
 916                 talloc_destroy(*ntlmssp_state);
 917                 return NT_STATUS_NO_MEMORY;
 918         }
 919
 920         (*ntlmssp_state)->role = NTLMSSP_SERVER;
 921
 922         (*ntlmssp_state)->get_challenge = get_challenge;
 923         (*ntlmssp_state)->set_challenge = set_challenge;
 924         (*ntlmssp_state)->may_set_challenge = may_set_challenge;
 925
 926         (*ntlmssp_state)->get_global_myname = global_myname;
 927         (*ntlmssp_state)->get_domain = lp_workgroup;
 928         (*ntlmssp_state)->server_role = ROLE_DOMAIN_MEMBER; /* a good default */
 929
 930         (*ntlmssp_state)->expected_state = NTLMSSP_NEGOTIATE;
 931
 932         (*ntlmssp_state)->ref_count = 1;
 933
 934         (*ntlmssp_state)->neg_flags =
 935                 NTLMSSP_NEGOTIATE_128 |
 936                 NTLMSSP_NEGOTIATE_56 |
 937                 NTLMSSP_NEGOTIATE_VERSION |
 938                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
 939                 NTLMSSP_NEGOTIATE_NTLM |
 940                 NTLMSSP_NEGOTIATE_NTLM2 |
 941                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 942                 NTLMSSP_NEGOTIATE_SIGN |
 943                 NTLMSSP_NEGOTIATE_SEAL;
 944
 945         return NT_STATUS_OK;
 946 }
 947
 948 /*********************************************************************
 949  Client side NTLMSSP
 950 *********************************************************************/
 951
 952 /**
 953  * Next state function for the Initial packet
 954  *
 955  * @param ntlmssp_state NTLMSSP State
 956  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 957  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 958  * @return Errors or NT_STATUS_OK.
 959  */
 960
 961 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
 962                                   DATA_BLOB reply, DATA_BLOB *next_request)
 963 {
 964         if (ntlmssp_state->unicode) {
 965                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 966         } else {
 967                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 968         }
 969
 970         if (ntlmssp_state->use_ntlmv2) {
 971                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 972         }
 973
 974         /* generate the ntlmssp negotiate packet */
 975         msrpc_gen(next_request, "CddAA",
 976                   "NTLMSSP",
 977                   NTLMSSP_NEGOTIATE,
 978                   ntlmssp_state->neg_flags,
 979                   ntlmssp_state->get_domain(),
 980                   ntlmssp_state->get_global_myname());
 981
 982         ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
 983
 984         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 985 }
 986
 987 /**
 988  * Next state function for the Challenge Packet.  Generate an auth packet.
 989  *
 990  * @param ntlmssp_state NTLMSSP State
 991  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 992  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 993  * @return Errors or NT_STATUS_OK.
 994  */
 995
 996 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
 997                                          const DATA_BLOB reply, DATA_BLOB *next_request)
 998 {
 999         uint32 chal_flags, ntlmssp_command, unkn1, unkn2;
1000         DATA_BLOB server_domain_blob;
1001         DATA_BLOB challenge_blob;
1002         DATA_BLOB struct_blob = data_blob_null;
1003         char *server_domain;
1004         const char *chal_parse_string;
1005         const char *auth_gen_string;
1006         DATA_BLOB lm_response = data_blob_null;
1007         DATA_BLOB nt_response = data_blob_null;
1008         DATA_BLOB session_key = data_blob_null;
1009         DATA_BLOB encrypted_session_key = data_blob_null;
1010         NTSTATUS nt_status = NT_STATUS_OK;
1011
1012         if (!msrpc_parse(&reply, "CdBd",
1013                          "NTLMSSP",
1014                          &ntlmssp_command,
1015                          &server_domain_blob,
1016                          &chal_flags)) {
1017                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
1018                 dump_data(2, reply.data, reply.length);
1019
1020                 return NT_STATUS_INVALID_PARAMETER;
1021         }
1022
1023         data_blob_free(&server_domain_blob);
1024
1025         DEBUG(3, ("Got challenge flags:\n"));
1026         debug_ntlmssp_flags(chal_flags);
1027
1028         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
1029
1030         if (ntlmssp_state->unicode) {
1031                 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
1032                         chal_parse_string = "CdUdbddB";
1033                 } else {
1034                         chal_parse_string = "CdUdbdd";
1035                 }
1036                 auth_gen_string = "CdBBUUUBd";
1037         } else {
1038                 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
1039                         chal_parse_string = "CdAdbddB";
1040                 } else {
1041                         chal_parse_string = "CdAdbdd";
1042                 }
1043
1044                 auth_gen_string = "CdBBAAABd";
1045         }
1046
1047         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
1048         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
1049
1050         if (!msrpc_parse(&reply, chal_parse_string,
1051                          "NTLMSSP",
1052                          &ntlmssp_command,
1053                          &server_domain,
1054                          &chal_flags,
1055                          &challenge_blob, 8,
1056                          &unkn1, &unkn2,
1057                          &struct_blob)) {
1058                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
1059                 dump_data(2, reply.data, reply.length);
1060                 return NT_STATUS_INVALID_PARAMETER;
1061         }
1062
1063         ntlmssp_state->server_domain = talloc_strdup(ntlmssp_state,
1064                                                      server_domain);
1065
1066         SAFE_FREE(server_domain);
1067         if (challenge_blob.length != 8) {
1068                 data_blob_free(&struct_blob);
1069                 return NT_STATUS_INVALID_PARAMETER;
1070         }
1071
1072         if (!ntlmssp_state->nt_hash || !ntlmssp_state->lm_hash) {
1073                 uchar zeros[16];
1074                 /* do nothing - blobs are zero length */
1075
1076                 ZERO_STRUCT(zeros);
1077
1078                 /* session key is all zeros */
1079                 session_key = data_blob_talloc(ntlmssp_state, zeros, 16);
1080
1081                 /* not doing NLTM2 without a password */
1082                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
1083         } else if (ntlmssp_state->use_ntlmv2) {
1084
1085                 if (!struct_blob.length) {
1086                         /* be lazy, match win2k - we can't do NTLMv2 without it */
1087                         DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
1088                         return NT_STATUS_INVALID_PARAMETER;
1089                 }
1090
1091                 /* TODO: if the remote server is standalone, then we should replace 'domain'
1092                    with the server name as supplied above */
1093
1094                 if (!SMBNTLMv2encrypt_hash(ntlmssp_state->user,
1095                                       ntlmssp_state->domain,
1096                                       ntlmssp_state->nt_hash, &challenge_blob,
1097                                       &struct_blob,
1098                                       &lm_response, &nt_response, &session_key)) {
1099                         data_blob_free(&challenge_blob);
1100                         data_blob_free(&struct_blob);
1101                         return NT_STATUS_NO_MEMORY;
1102                 }
1103         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
1104                 struct MD5Context md5_session_nonce_ctx;
1105                 uchar session_nonce[16];
1106                 uchar session_nonce_hash[16];
1107                 uchar user_session_key[16];
1108
1109                 lm_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1110                 generate_random_buffer(lm_response.data, 8);
1111                 memset(lm_response.data+8, 0, 16);
1112
1113                 memcpy(session_nonce, challenge_blob.data, 8);
1114                 memcpy(&session_nonce[8], lm_response.data, 8);
1115
1116                 MD5Init(&md5_session_nonce_ctx);
1117                 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
1118                 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
1119                 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
1120
1121                 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
1122                 DEBUG(5, ("challenge is: \n"));
1123                 dump_data(5, session_nonce_hash, 8);
1124
1125                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1126                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,
1127                              session_nonce_hash,
1128                              nt_response.data);
1129
1130                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
1131
1132                 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, NULL, user_session_key);
1133                 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
1134                 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
1135         } else {
1136                 /* lanman auth is insecure, it may be disabled */
1137                 if (lp_client_lanman_auth()) {
1138                         lm_response = data_blob_talloc(ntlmssp_state,
1139                                                        NULL, 24);
1140                         SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
1141                                    lm_response.data);
1142                 }
1143
1144                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1145                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
1146                              nt_response.data);
1147
1148                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
1149                 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
1150                     && lp_client_lanman_auth()) {
1151                         SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
1152                                         session_key.data);
1153                         dump_data_pw("LM session key\n", session_key.data, session_key.length);
1154                 } else {
1155                         SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, NULL, session_key.data);
1156                         dump_data_pw("NT session key:\n", session_key.data, session_key.length);
1157                 }
1158         }
1159         data_blob_free(&struct_blob);
1160
1161         /* Key exchange encryptes a new client-generated session key with
1162            the password-derived key */
1163         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
1164                 /* Make up a new session key */
1165                 uint8 client_session_key[16];
1166                 generate_random_buffer(client_session_key, sizeof(client_session_key));
1167
1168                 /* Encrypt the new session key with the old one */
1169                 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
1170                 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
1171                 SamOEMhash(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
1172                 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
1173
1174                 /* Mark the new session key as the 'real' session key */
1175                 data_blob_free(&session_key);
1176                 session_key = data_blob_talloc(ntlmssp_state,
1177                                                client_session_key,
1178                                                sizeof(client_session_key));
1179         }
1180
1181         /* this generates the actual auth packet */
1182         if (!msrpc_gen(next_request, auth_gen_string,
1183                        "NTLMSSP",
1184                        NTLMSSP_AUTH,
1185                        lm_response.data, lm_response.length,
1186                        nt_response.data, nt_response.length,
1187                        ntlmssp_state->domain,
1188                        ntlmssp_state->user,
1189                        ntlmssp_state->get_global_myname(),
1190                        encrypted_session_key.data, encrypted_session_key.length,
1191                        ntlmssp_state->neg_flags)) {
1192
1193                 return NT_STATUS_NO_MEMORY;
1194         }
1195
1196         data_blob_free(&encrypted_session_key);
1197
1198         data_blob_free(&ntlmssp_state->chal);
1199
1200         ntlmssp_state->session_key = session_key;
1201
1202         ntlmssp_state->chal = challenge_blob;
1203         ntlmssp_state->lm_resp = lm_response;
1204         ntlmssp_state->nt_resp = nt_response;
1205
1206         ntlmssp_state->expected_state = NTLMSSP_DONE;
1207
1208         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
1209                 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
1210         }
1211
1212         return nt_status;
1213 }
1214
1215 NTSTATUS ntlmssp_client_start(NTLMSSP_STATE **ntlmssp_state)
1216 {
1217         *ntlmssp_state = TALLOC_ZERO_P(NULL, NTLMSSP_STATE);
1218         if (!*ntlmssp_state) {
1219                 DEBUG(0,("ntlmssp_client_start: talloc failed!\n"));
1220                 talloc_destroy(*ntlmssp_state);
1221                 return NT_STATUS_NO_MEMORY;
1222         }
1223
1224         (*ntlmssp_state)->role = NTLMSSP_CLIENT;
1225
1226         (*ntlmssp_state)->get_global_myname = global_myname;
1227         (*ntlmssp_state)->get_domain = lp_workgroup;
1228
1229         (*ntlmssp_state)->unicode = True;
1230
1231         (*ntlmssp_state)->use_ntlmv2 = lp_client_ntlmv2_auth();
1232
1233         (*ntlmssp_state)->expected_state = NTLMSSP_INITIAL;
1234
1235         (*ntlmssp_state)->ref_count = 1;
1236
1237         (*ntlmssp_state)->neg_flags =
1238                 NTLMSSP_NEGOTIATE_128 |
1239                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
1240                 NTLMSSP_NEGOTIATE_NTLM |
1241                 NTLMSSP_NEGOTIATE_NTLM2 |
1242                 NTLMSSP_NEGOTIATE_KEY_EXCH |
1243                 NTLMSSP_REQUEST_TARGET;
1244
1245         return NT_STATUS_OK;
1246 }