source/libsmb/ntlmssp.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    handle NLTMSSP, server side
   5
   6    Copyright (C) Andrew Tridgell      2001
   7    Copyright (C) Andrew Bartlett 2001-2003
   8    Copyright (C) Andrew Bartlett 2005 (Updated from gensec).
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 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_128)
  99                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_128\n"));
 100         if (neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)
 101                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_KEY_EXCH\n"));
 102         if (neg_flags & NTLMSSP_NEGOTIATE_56)
 103                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_56\n"));
 104 }
 105
 106 /**
 107  * Default challenge generation code.
 108  *
 109  */
 110
 111 static const uint8 *get_challenge(const struct ntlmssp_state *ntlmssp_state)
 112 {
 113         static uchar chal[8];
 114         generate_random_buffer(chal, sizeof(chal));
 115
 116         return chal;
 117 }
 118
 119 /**
 120  * Default 'we can set the challenge to anything we like' implementation
 121  *
 122  */
 123
 124 static bool may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
 125 {
 126         return True;
 127 }
 128
 129 /**
 130  * Default 'we can set the challenge to anything we like' implementation
 131  *
 132  * Does not actually do anything, as the value is always in the structure anyway.
 133  *
 134  */
 135
 136 static NTSTATUS set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
 137 {
 138         SMB_ASSERT(challenge->length == 8);
 139         return NT_STATUS_OK;
 140 }
 141
 142 /**
 143  * Set a username on an NTLMSSP context - ensures it is talloc()ed
 144  *
 145  */
 146
 147 NTSTATUS ntlmssp_set_username(NTLMSSP_STATE *ntlmssp_state, const char *user)
 148 {
 149         ntlmssp_state->user = talloc_strdup(ntlmssp_state->mem_ctx, user ? user : "" );
 150         if (!ntlmssp_state->user) {
 151                 return NT_STATUS_NO_MEMORY;
 152         }
 153         return NT_STATUS_OK;
 154 }
 155
 156 /**
 157  * Store NT and LM hashes on an NTLMSSP context - ensures they are talloc()ed
 158  *
 159  */
 160 NTSTATUS ntlmssp_set_hashes(NTLMSSP_STATE *ntlmssp_state,
 161                 const unsigned char lm_hash[16],
 162                 const unsigned char nt_hash[16])
 163 {
 164         ntlmssp_state->lm_hash = (unsigned char *)
 165                 TALLOC_MEMDUP(ntlmssp_state->mem_ctx, lm_hash, 16);
 166         ntlmssp_state->nt_hash = (unsigned char *)
 167                 TALLOC_MEMDUP(ntlmssp_state->mem_ctx, nt_hash, 16);
 168         if (!ntlmssp_state->lm_hash || !ntlmssp_state->nt_hash) {
 169                 TALLOC_FREE(ntlmssp_state->lm_hash);
 170                 TALLOC_FREE(ntlmssp_state->nt_hash);
 171                 return NT_STATUS_NO_MEMORY;
 172         }
 173         return NT_STATUS_OK;
 174 }
 175
 176 /**
 177  * Converts a password to the hashes on an NTLMSSP context.
 178  *
 179  */
 180 NTSTATUS ntlmssp_set_password(NTLMSSP_STATE *ntlmssp_state, const char *password)
 181 {
 182         if (!password) {
 183                 ntlmssp_state->lm_hash = NULL;
 184                 ntlmssp_state->nt_hash = NULL;
 185         } else {
 186                 unsigned char lm_hash[16];
 187                 unsigned char nt_hash[16];
 188
 189                 E_deshash(password, lm_hash);
 190                 E_md4hash(password, nt_hash);
 191                 return ntlmssp_set_hashes(ntlmssp_state, lm_hash, nt_hash);
 192         }
 193         return NT_STATUS_OK;
 194 }
 195
 196 /**
 197  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
 198  *
 199  */
 200 NTSTATUS ntlmssp_set_domain(NTLMSSP_STATE *ntlmssp_state, const char *domain)
 201 {
 202         ntlmssp_state->domain = talloc_strdup(ntlmssp_state->mem_ctx, domain ? domain : "" );
 203         if (!ntlmssp_state->domain) {
 204                 return NT_STATUS_NO_MEMORY;
 205         }
 206         return NT_STATUS_OK;
 207 }
 208
 209 /**
 210  * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
 211  *
 212  */
 213 NTSTATUS ntlmssp_set_workstation(NTLMSSP_STATE *ntlmssp_state, const char *workstation)
 214 {
 215         ntlmssp_state->workstation = talloc_strdup(ntlmssp_state->mem_ctx, workstation);
 216         if (!ntlmssp_state->workstation) {
 217                 return NT_STATUS_NO_MEMORY;
 218         }
 219         return NT_STATUS_OK;
 220 }
 221
 222 /**
 223  *  Store a DATA_BLOB containing an NTLMSSP response, for use later.
 224  *  This copies the data blob
 225  */
 226
 227 NTSTATUS ntlmssp_store_response(NTLMSSP_STATE *ntlmssp_state,
 228                                 DATA_BLOB response)
 229 {
 230         ntlmssp_state->stored_response = data_blob_talloc(ntlmssp_state->mem_ctx,
 231                                                           response.data, response.length);
 232         return NT_STATUS_OK;
 233 }
 234
 235 /**
 236  * Request features for the NTLMSSP negotiation
 237  *
 238  * @param ntlmssp_state NTLMSSP state
 239  * @param feature_list List of space seperated features requested from NTLMSSP.
 240  */
 241 void ntlmssp_want_feature_list(NTLMSSP_STATE *ntlmssp_state, char *feature_list)
 242 {
 243         /*
 244          * We need to set this to allow a later SetPassword
 245          * via the SAMR pipe to succeed. Strange.... We could
 246          * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
 247          */
 248         if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, True)) {
 249                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 250         }
 251         if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, True)) {
 252                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 253         }
 254         if(in_list("NTLMSSP_FEATURE_SEAL", feature_list, True)) {
 255                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 256         }
 257 }
 258
 259 /**
 260  * Request a feature for the NTLMSSP negotiation
 261  *
 262  * @param ntlmssp_state NTLMSSP state
 263  * @param feature Bit flag specifying the requested feature
 264  */
 265 void ntlmssp_want_feature(NTLMSSP_STATE *ntlmssp_state, uint32 feature)
 266 {
 267         /* As per JRA's comment above */
 268         if (feature & NTLMSSP_FEATURE_SESSION_KEY) {
 269                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 270         }
 271         if (feature & NTLMSSP_FEATURE_SIGN) {
 272                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 273         }
 274         if (feature & NTLMSSP_FEATURE_SEAL) {
 275                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 276         }
 277 }
 278
 279 /**
 280  * Next state function for the NTLMSSP state machine
 281  *
 282  * @param ntlmssp_state NTLMSSP State
 283  * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
 284  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 285  * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
 286  */
 287
 288 NTSTATUS ntlmssp_update(NTLMSSP_STATE *ntlmssp_state,
 289                         const DATA_BLOB in, DATA_BLOB *out)
 290 {
 291         DATA_BLOB input;
 292         uint32 ntlmssp_command;
 293         int i;
 294
 295         if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
 296                 /* Called update after negotiations finished. */
 297                 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
 298                 return NT_STATUS_INVALID_PARAMETER;
 299         }
 300
 301         *out = data_blob_null;
 302
 303         if (!in.length && ntlmssp_state->stored_response.length) {
 304                 input = ntlmssp_state->stored_response;
 305
 306                 /* we only want to read the stored response once - overwrite it */
 307                 ntlmssp_state->stored_response = data_blob_null;
 308         } else {
 309                 input = in;
 310         }
 311
 312         if (!input.length) {
 313                 switch (ntlmssp_state->role) {
 314                 case NTLMSSP_CLIENT:
 315                         ntlmssp_command = NTLMSSP_INITIAL;
 316                         break;
 317                 case NTLMSSP_SERVER:
 318                         /* 'datagram' mode - no neg packet */
 319                         ntlmssp_command = NTLMSSP_NEGOTIATE;
 320                         break;
 321                 }
 322         } else {
 323                 if (!msrpc_parse(&input, "Cd",
 324                                  "NTLMSSP",
 325                                  &ntlmssp_command)) {
 326                         DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
 327                         dump_data(2, input.data, input.length);
 328                         return NT_STATUS_INVALID_PARAMETER;
 329                 }
 330         }
 331
 332         if (ntlmssp_command != ntlmssp_state->expected_state) {
 333                 DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
 334                 return NT_STATUS_INVALID_PARAMETER;
 335         }
 336
 337         for (i=0; ntlmssp_callbacks[i].fn; i++) {
 338                 if (ntlmssp_callbacks[i].role == ntlmssp_state->role
 339                     && ntlmssp_callbacks[i].ntlmssp_command == ntlmssp_command) {
 340                         return ntlmssp_callbacks[i].fn(ntlmssp_state, input, out);
 341                 }
 342         }
 343
 344         DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
 345                   ntlmssp_state->role, ntlmssp_command));
 346
 347         return NT_STATUS_INVALID_PARAMETER;
 348 }
 349
 350 /**
 351  * End an NTLMSSP state machine
 352  *
 353  * @param ntlmssp_state NTLMSSP State, free()ed by this function
 354  */
 355
 356 void ntlmssp_end(NTLMSSP_STATE **ntlmssp_state)
 357 {
 358         TALLOC_CTX *mem_ctx = (*ntlmssp_state)->mem_ctx;
 359
 360         (*ntlmssp_state)->ref_count--;
 361
 362         if ((*ntlmssp_state)->ref_count == 0) {
 363                 data_blob_free(&(*ntlmssp_state)->chal);
 364                 data_blob_free(&(*ntlmssp_state)->lm_resp);
 365                 data_blob_free(&(*ntlmssp_state)->nt_resp);
 366
 367                 talloc_destroy(mem_ctx);
 368         }
 369
 370         *ntlmssp_state = NULL;
 371         return;
 372 }
 373
 374 /**
 375  * Determine correct target name flags for reply, given server role
 376  * and negotiated flags
 377  *
 378  * @param ntlmssp_state NTLMSSP State
 379  * @param neg_flags The flags from the packet
 380  * @param chal_flags The flags to be set in the reply packet
 381  * @return The 'target name' string.
 382  */
 383
 384 static const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
 385                                        uint32 neg_flags, uint32 *chal_flags)
 386 {
 387         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
 388                 *chal_flags |= NTLMSSP_CHAL_TARGET_INFO;
 389                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
 390                 if (ntlmssp_state->server_role == ROLE_STANDALONE) {
 391                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
 392                         return ntlmssp_state->get_global_myname();
 393                 } else {
 394                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
 395                         return ntlmssp_state->get_domain();
 396                 };
 397         } else {
 398                 return "";
 399         }
 400 }
 401
 402 static void ntlmssp_handle_neg_flags(struct ntlmssp_state *ntlmssp_state,
 403                                       uint32 neg_flags, bool allow_lm) {
 404         if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
 405                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 406                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_OEM;
 407                 ntlmssp_state->unicode = True;
 408         } else {
 409                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_UNICODE;
 410                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 411                 ntlmssp_state->unicode = False;
 412         }
 413
 414         if ((neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && allow_lm) {
 415                 /* other end forcing us to use LM */
 416                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
 417                 ntlmssp_state->use_ntlmv2 = False;
 418         } else {
 419                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 420         }
 421
 422         if (!(neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)) {
 423                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 424         }
 425
 426         if (!(neg_flags & NTLMSSP_NEGOTIATE_NTLM2)) {
 427                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 428         }
 429
 430         if (!(neg_flags & NTLMSSP_NEGOTIATE_128)) {
 431                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_128;
 432         }
 433
 434         if (!(neg_flags & NTLMSSP_NEGOTIATE_56)) {
 435                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_56;
 436         }
 437
 438         if (!(neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)) {
 439                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_KEY_EXCH;
 440         }
 441
 442         if (!(neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
 443                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN;
 444         }
 445
 446         if (!(neg_flags & NTLMSSP_NEGOTIATE_SEAL)) {
 447                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SEAL;
 448         }
 449
 450         /* Woop Woop - unknown flag for Windows compatibility...
 451            What does this really do ? JRA. */
 452         if (!(neg_flags & NTLMSSP_UNKNOWN_02000000)) {
 453                 ntlmssp_state->neg_flags &= ~NTLMSSP_UNKNOWN_02000000;
 454         }
 455
 456         if ((neg_flags & NTLMSSP_REQUEST_TARGET)) {
 457                 ntlmssp_state->neg_flags |= NTLMSSP_REQUEST_TARGET;
 458         }
 459 }
 460
 461 /**
 462  Weaken NTLMSSP keys to cope with down-level clients and servers.
 463
 464  We probably should have some parameters to control this, but as
 465  it only occours for LM_KEY connections, and this is controlled
 466  by the client lanman auth/lanman auth parameters, it isn't too bad.
 467 */
 468
 469 DATA_BLOB ntlmssp_weaken_keys(NTLMSSP_STATE *ntlmssp_state, TALLOC_CTX *mem_ctx)
 470 {
 471         DATA_BLOB weakened_key = data_blob_talloc(mem_ctx,
 472                                         ntlmssp_state->session_key.data,
 473                                         ntlmssp_state->session_key.length);
 474
 475         /* Nothing to weaken.  We certainly don't want to 'extend' the length... */
 476         if (weakened_key.length < 16) {
 477                 /* perhaps there was no key? */
 478                 return weakened_key;
 479         }
 480
 481         /* Key weakening not performed on the master key for NTLM2
 482            and does not occour for NTLM1.  Therefore we only need
 483            to do this for the LM_KEY.
 484         */
 485
 486         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
 487                 /* LM key doesn't support 128 bit crypto, so this is
 488                  * the best we can do.  If you negotiate 128 bit, but
 489                  * not 56, you end up with 40 bit... */
 490                 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
 491                         weakened_key.data[7] = 0xa0;
 492                 } else { /* forty bits */
 493                         weakened_key.data[5] = 0xe5;
 494                         weakened_key.data[6] = 0x38;
 495                         weakened_key.data[7] = 0xb0;
 496                 }
 497                 weakened_key.length = 8;
 498         }
 499         return weakened_key;
 500 }
 501
 502 /**
 503  * Next state function for the Negotiate packet
 504  *
 505  * @param ntlmssp_state NTLMSSP State
 506  * @param request The request, as a DATA_BLOB
 507  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 508  * @return Errors or MORE_PROCESSING_REQUIRED if a reply is sent.
 509  */
 510
 511 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
 512                                          const DATA_BLOB request, DATA_BLOB *reply)
 513 {
 514         DATA_BLOB struct_blob;
 515         const char *dnsname;
 516         char *dnsdomname = NULL;
 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, 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         /* This should be a 'netbios domain -> DNS domain' mapping */
 567         dnsdomname = get_mydnsdomname(ntlmssp_state->mem_ctx);
 568         if (!dnsdomname) {
 569                 return NT_STATUS_BAD_NETWORK_NAME;
 570         }
 571         strlower_m(dnsdomname);
 572
 573         dnsname = get_mydnsfullname();
 574         if (!dnsdomname) {
 575                 return NT_STATUS_INVALID_COMPUTER_NAME;
 576         }
 577
 578         /* This creates the 'blob' of names that appears at the end of the packet */
 579         if (chal_flags & NTLMSSP_CHAL_TARGET_INFO)
 580         {
 581                 msrpc_gen(&struct_blob, "aaaaa",
 582                           NTLMSSP_NAME_TYPE_DOMAIN, target_name,
 583                           NTLMSSP_NAME_TYPE_SERVER, ntlmssp_state->get_global_myname(),
 584                           NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
 585                           NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
 586                           0, "");
 587         } else {
 588                 struct_blob = data_blob_null;
 589         }
 590
 591         {
 592                 /* Marshel the packet in the right format, be it unicode or ASCII */
 593                 const char *gen_string;
 594                 if (ntlmssp_state->unicode) {
 595                         gen_string = "CdUdbddB";
 596                 } else {
 597                         gen_string = "CdAdbddB";
 598                 }
 599
 600                 msrpc_gen(reply, gen_string,
 601                           "NTLMSSP",
 602                           NTLMSSP_CHALLENGE,
 603                           target_name,
 604                           chal_flags,
 605                           cryptkey, 8,
 606                           0, 0,
 607                           struct_blob.data, struct_blob.length);
 608         }
 609
 610         data_blob_free(&struct_blob);
 611
 612         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 613
 614         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 615 }
 616
 617 /**
 618  * Next state function for the Authenticate packet
 619  *
 620  * @param ntlmssp_state NTLMSSP State
 621  * @param request The request, as a DATA_BLOB
 622  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 623  * @return Errors or NT_STATUS_OK.
 624  */
 625
 626 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
 627                                     const DATA_BLOB request, DATA_BLOB *reply)
 628 {
 629         DATA_BLOB encrypted_session_key = data_blob_null;
 630         DATA_BLOB user_session_key = data_blob_null;
 631         DATA_BLOB lm_session_key = data_blob_null;
 632         DATA_BLOB session_key = data_blob_null;
 633         uint32 ntlmssp_command, auth_flags;
 634         NTSTATUS nt_status = NT_STATUS_OK;
 635
 636         /* used by NTLM2 */
 637         bool doing_ntlm2 = False;
 638
 639         uchar session_nonce[16];
 640         uchar session_nonce_hash[16];
 641
 642         const char *parse_string;
 643         char *domain = NULL;
 644         char *user = NULL;
 645         char *workstation = NULL;
 646
 647         /* parse the NTLMSSP packet */
 648         *reply = data_blob_null;
 649
 650 #if 0
 651         file_save("ntlmssp_auth.dat", request.data, request.length);
 652 #endif
 653
 654         if (ntlmssp_state->unicode) {
 655                 parse_string = "CdBBUUUBd";
 656         } else {
 657                 parse_string = "CdBBAAABd";
 658         }
 659
 660         data_blob_free(&ntlmssp_state->lm_resp);
 661         data_blob_free(&ntlmssp_state->nt_resp);
 662
 663         ntlmssp_state->user = NULL;
 664         ntlmssp_state->domain = NULL;
 665         ntlmssp_state->workstation = NULL;
 666
 667         /* now the NTLMSSP encoded auth hashes */
 668         if (!msrpc_parse(&request, parse_string,
 669                          "NTLMSSP",
 670                          &ntlmssp_command,
 671                          &ntlmssp_state->lm_resp,
 672                          &ntlmssp_state->nt_resp,
 673                          &domain,
 674                          &user,
 675                          &workstation,
 676                          &encrypted_session_key,
 677                          &auth_flags)) {
 678                 SAFE_FREE(domain);
 679                 SAFE_FREE(user);
 680                 SAFE_FREE(workstation);
 681                 data_blob_free(&encrypted_session_key);
 682                 auth_flags = 0;
 683
 684                 /* Try again with a shorter string (Win9X truncates this packet) */
 685                 if (ntlmssp_state->unicode) {
 686                         parse_string = "CdBBUUU";
 687                 } else {
 688                         parse_string = "CdBBAAA";
 689                 }
 690
 691                 /* now the NTLMSSP encoded auth hashes */
 692                 if (!msrpc_parse(&request, parse_string,
 693                                  "NTLMSSP",
 694                                  &ntlmssp_command,
 695                                  &ntlmssp_state->lm_resp,
 696                                  &ntlmssp_state->nt_resp,
 697                                  &domain,
 698                                  &user,
 699                                  &workstation)) {
 700                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
 701                         dump_data(2, request.data, request.length);
 702                         SAFE_FREE(domain);
 703                         SAFE_FREE(user);
 704                         SAFE_FREE(workstation);
 705
 706                         return NT_STATUS_INVALID_PARAMETER;
 707                 }
 708         }
 709
 710         if (auth_flags)
 711                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
 712
 713         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, domain))) {
 714                 SAFE_FREE(domain);
 715                 SAFE_FREE(user);
 716                 SAFE_FREE(workstation);
 717                 data_blob_free(&encrypted_session_key);
 718                 return nt_status;
 719         }
 720
 721         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(ntlmssp_state, user))) {
 722                 SAFE_FREE(domain);
 723                 SAFE_FREE(user);
 724                 SAFE_FREE(workstation);
 725                 data_blob_free(&encrypted_session_key);
 726                 return nt_status;
 727         }
 728
 729         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(ntlmssp_state, workstation))) {
 730                 SAFE_FREE(domain);
 731                 SAFE_FREE(user);
 732                 SAFE_FREE(workstation);
 733                 data_blob_free(&encrypted_session_key);
 734                 return nt_status;
 735         }
 736
 737         SAFE_FREE(domain);
 738         SAFE_FREE(user);
 739         SAFE_FREE(workstation);
 740
 741         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 742                  ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
 743
 744 #if 0
 745         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 746         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 747 #endif
 748
 749         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 750            client challenge
 751
 752            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 753         */
 754         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 755                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 756                         struct MD5Context md5_session_nonce_ctx;
 757                         SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
 758
 759                         doing_ntlm2 = True;
 760
 761                         memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
 762                         memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 763
 764                         MD5Init(&md5_session_nonce_ctx);
 765                         MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
 766                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 767
 768                         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, session_nonce_hash, 8);
 769
 770                         /* LM response is no longer useful */
 771                         data_blob_free(&ntlmssp_state->lm_resp);
 772
 773                         /* We changed the effective challenge - set it */
 774                         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
 775                                 data_blob_free(&encrypted_session_key);
 776                                 return nt_status;
 777                         }
 778
 779                         /* LM Key is incompatible. */
 780                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 781                 }
 782         }
 783
 784         /*
 785          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 786          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 787          * smb.conf file) and no NTLMv2 response was sent then the password check
 788          * will fail here. JRA.
 789          */
 790
 791         /* Finally, actually ask if the password is OK */
 792
 793         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
 794                                                                        &user_session_key, &lm_session_key))) {
 795                 data_blob_free(&encrypted_session_key);
 796                 return nt_status;
 797         }
 798
 799         dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
 800         dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
 801
 802         /* Handle the different session key derivation for NTLM2 */
 803         if (doing_ntlm2) {
 804                 if (user_session_key.data && user_session_key.length == 16) {
 805                         session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
 806                         hmac_md5(user_session_key.data, session_nonce,
 807                                  sizeof(session_nonce), session_key.data);
 808                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 809                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 810
 811                 } else {
 812                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 813                         session_key = data_blob_null;
 814                 }
 815         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
 816                 if (lm_session_key.data && lm_session_key.length >= 8) {
 817                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 818                                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
 819                                 if (session_key.data == NULL) {
 820                                         return NT_STATUS_NO_MEMORY;
 821                                 }
 822                                 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
 823                                                           session_key.data);
 824                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 825                         } else {
 826                                 static const uint8 zeros[24] = { 0, };
 827                                 session_key = data_blob_talloc(
 828                                         ntlmssp_state->mem_ctx, NULL, 16);
 829                                 if (session_key.data == NULL) {
 830                                         return NT_STATUS_NO_MEMORY;
 831                                 }
 832                                 SMBsesskeygen_lm_sess_key(
 833                                         lm_session_key.data, zeros,
 834                                         session_key.data);
 835                         }
 836                         dump_data_pw("LM session key:\n", session_key.data,
 837                                      session_key.length);
 838                 } else {
 839                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 840                         session_key = data_blob_null;
 841                 }
 842         } else if (user_session_key.data) {
 843                 session_key = user_session_key;
 844                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 845                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 846         } else if (lm_session_key.data) {
 847                 session_key = lm_session_key;
 848                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 849                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 850         } else {
 851                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 852                 session_key = data_blob_null;
 853         }
 854
 855         /* With KEY_EXCH, the client supplies the proposed session key,
 856            but encrypts it with the long-term key */
 857         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 858                 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
 859                         data_blob_free(&encrypted_session_key);
 860                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 861                                   (unsigned int)encrypted_session_key.length));
 862                         return NT_STATUS_INVALID_PARAMETER;
 863                 } else if (!session_key.data || session_key.length != 16) {
 864                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 865                                   (unsigned int)session_key.length));
 866                         ntlmssp_state->session_key = session_key;
 867                 } else {
 868                         dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
 869                         SamOEMhash(encrypted_session_key.data,
 870                                    session_key.data,
 871                                    encrypted_session_key.length);
 872                         ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state->mem_ctx,
 873                                                                       encrypted_session_key.data,
 874                                                                       encrypted_session_key.length);
 875                         dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
 876                                      encrypted_session_key.length);
 877                 }
 878         } else {
 879                 ntlmssp_state->session_key = session_key;
 880         }
 881
 882         if (!NT_STATUS_IS_OK(nt_status)) {
 883                 ntlmssp_state->session_key = data_blob_null;
 884         } else if (ntlmssp_state->session_key.length) {
 885                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 886         }
 887
 888         data_blob_free(&encrypted_session_key);
 889
 890         /* Only one authentication allowed per server state. */
 891         ntlmssp_state->expected_state = NTLMSSP_DONE;
 892
 893         return nt_status;
 894 }
 895
 896 /**
 897  * Create an NTLMSSP state machine
 898  *
 899  * @param ntlmssp_state NTLMSSP State, allocated by this function
 900  */
 901
 902 NTSTATUS ntlmssp_server_start(NTLMSSP_STATE **ntlmssp_state)
 903 {
 904         TALLOC_CTX *mem_ctx;
 905
 906         mem_ctx = talloc_init("NTLMSSP context");
 907
 908         *ntlmssp_state = TALLOC_ZERO_P(mem_ctx, NTLMSSP_STATE);
 909         if (!*ntlmssp_state) {
 910                 DEBUG(0,("ntlmssp_server_start: talloc failed!\n"));
 911                 talloc_destroy(mem_ctx);
 912                 return NT_STATUS_NO_MEMORY;
 913         }
 914
 915         (*ntlmssp_state)->role = NTLMSSP_SERVER;
 916
 917         (*ntlmssp_state)->mem_ctx = mem_ctx;
 918         (*ntlmssp_state)->get_challenge = get_challenge;
 919         (*ntlmssp_state)->set_challenge = set_challenge;
 920         (*ntlmssp_state)->may_set_challenge = may_set_challenge;
 921
 922         (*ntlmssp_state)->get_global_myname = global_myname;
 923         (*ntlmssp_state)->get_domain = lp_workgroup;
 924         (*ntlmssp_state)->server_role = ROLE_DOMAIN_MEMBER; /* a good default */
 925
 926         (*ntlmssp_state)->expected_state = NTLMSSP_NEGOTIATE;
 927
 928         (*ntlmssp_state)->ref_count = 1;
 929
 930         (*ntlmssp_state)->neg_flags =
 931                 NTLMSSP_NEGOTIATE_128 |
 932                 NTLMSSP_NEGOTIATE_56 |
 933                 NTLMSSP_UNKNOWN_02000000 |
 934                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
 935                 NTLMSSP_NEGOTIATE_NTLM |
 936                 NTLMSSP_NEGOTIATE_NTLM2 |
 937                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 938                 NTLMSSP_NEGOTIATE_SIGN |
 939                 NTLMSSP_NEGOTIATE_SEAL;
 940
 941         return NT_STATUS_OK;
 942 }
 943
 944 /*********************************************************************
 945  Client side NTLMSSP
 946 *********************************************************************/
 947
 948 /**
 949  * Next state function for the Initial packet
 950  *
 951  * @param ntlmssp_state NTLMSSP State
 952  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 953  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 954  * @return Errors or NT_STATUS_OK.
 955  */
 956
 957 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
 958                                   DATA_BLOB reply, DATA_BLOB *next_request)
 959 {
 960         if (ntlmssp_state->unicode) {
 961                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 962         } else {
 963                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 964         }
 965
 966         if (ntlmssp_state->use_ntlmv2) {
 967                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 968         }
 969
 970         /* generate the ntlmssp negotiate packet */
 971         msrpc_gen(next_request, "CddAA",
 972                   "NTLMSSP",
 973                   NTLMSSP_NEGOTIATE,
 974                   ntlmssp_state->neg_flags,
 975                   ntlmssp_state->get_domain(),
 976                   ntlmssp_state->get_global_myname());
 977
 978         ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
 979
 980         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 981 }
 982
 983 /**
 984  * Next state function for the Challenge Packet.  Generate an auth packet.
 985  *
 986  * @param ntlmssp_state NTLMSSP State
 987  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 988  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 989  * @return Errors or NT_STATUS_OK.
 990  */
 991
 992 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
 993                                          const DATA_BLOB reply, DATA_BLOB *next_request)
 994 {
 995         uint32 chal_flags, ntlmssp_command, unkn1, unkn2;
 996         DATA_BLOB server_domain_blob;
 997         DATA_BLOB challenge_blob;
 998         DATA_BLOB struct_blob = data_blob_null;
 999         char *server_domain;
1000         const char *chal_parse_string;
1001         const char *auth_gen_string;
1002         DATA_BLOB lm_response = data_blob_null;
1003         DATA_BLOB nt_response = data_blob_null;
1004         DATA_BLOB session_key = data_blob_null;
1005         DATA_BLOB encrypted_session_key = data_blob_null;
1006         NTSTATUS nt_status = NT_STATUS_OK;
1007
1008         if (!msrpc_parse(&reply, "CdBd",
1009                          "NTLMSSP",
1010                          &ntlmssp_command,
1011                          &server_domain_blob,
1012                          &chal_flags)) {
1013                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
1014                 dump_data(2, reply.data, reply.length);
1015
1016                 return NT_STATUS_INVALID_PARAMETER;
1017         }
1018
1019         data_blob_free(&server_domain_blob);
1020
1021         DEBUG(3, ("Got challenge flags:\n"));
1022         debug_ntlmssp_flags(chal_flags);
1023
1024         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
1025
1026         if (ntlmssp_state->unicode) {
1027                 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
1028                         chal_parse_string = "CdUdbddB";
1029                 } else {
1030                         chal_parse_string = "CdUdbdd";
1031                 }
1032                 auth_gen_string = "CdBBUUUBd";
1033         } else {
1034                 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
1035                         chal_parse_string = "CdAdbddB";
1036                 } else {
1037                         chal_parse_string = "CdAdbdd";
1038                 }
1039
1040                 auth_gen_string = "CdBBAAABd";
1041         }
1042
1043         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
1044         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
1045
1046         if (!msrpc_parse(&reply, chal_parse_string,
1047                          "NTLMSSP",
1048                          &ntlmssp_command,
1049                          &server_domain,
1050                          &chal_flags,
1051                          &challenge_blob, 8,
1052                          &unkn1, &unkn2,
1053                          &struct_blob)) {
1054                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
1055                 dump_data(2, reply.data, reply.length);
1056                 return NT_STATUS_INVALID_PARAMETER;
1057         }
1058
1059         ntlmssp_state->server_domain = talloc_strdup(ntlmssp_state->mem_ctx,
1060                                                      server_domain);
1061
1062         SAFE_FREE(server_domain);
1063         if (challenge_blob.length != 8) {
1064                 data_blob_free(&struct_blob);
1065                 return NT_STATUS_INVALID_PARAMETER;
1066         }
1067
1068         if (!ntlmssp_state->nt_hash || !ntlmssp_state->lm_hash) {
1069                 static const uchar zeros[16] = { 0, };
1070                 /* do nothing - blobs are zero length */
1071
1072                 /* session key is all zeros */
1073                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, zeros, 16);
1074
1075                 /* not doing NLTM2 without a password */
1076                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
1077         } else if (ntlmssp_state->use_ntlmv2) {
1078
1079                 if (!struct_blob.length) {
1080                         /* be lazy, match win2k - we can't do NTLMv2 without it */
1081                         DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
1082                         return NT_STATUS_INVALID_PARAMETER;
1083                 }
1084
1085                 /* TODO: if the remote server is standalone, then we should replace 'domain'
1086                    with the server name as supplied above */
1087
1088                 if (!SMBNTLMv2encrypt_hash(ntlmssp_state->user,
1089                                       ntlmssp_state->domain,
1090                                       ntlmssp_state->nt_hash, &challenge_blob,
1091                                       &struct_blob,
1092                                       &lm_response, &nt_response, &session_key)) {
1093                         data_blob_free(&challenge_blob);
1094                         data_blob_free(&struct_blob);
1095                         return NT_STATUS_NO_MEMORY;
1096                 }
1097         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
1098                 struct MD5Context md5_session_nonce_ctx;
1099                 uchar session_nonce[16];
1100                 uchar session_nonce_hash[16];
1101                 uchar user_session_key[16];
1102
1103                 lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1104                 generate_random_buffer(lm_response.data, 8);
1105                 memset(lm_response.data+8, 0, 16);
1106
1107                 memcpy(session_nonce, challenge_blob.data, 8);
1108                 memcpy(&session_nonce[8], lm_response.data, 8);
1109
1110                 MD5Init(&md5_session_nonce_ctx);
1111                 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
1112                 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
1113                 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
1114
1115                 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
1116                 DEBUG(5, ("challenge is: \n"));
1117                 dump_data(5, session_nonce_hash, 8);
1118
1119                 nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1120                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,
1121                              session_nonce_hash,
1122                              nt_response.data);
1123
1124                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
1125
1126                 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, NULL, user_session_key);
1127                 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
1128                 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
1129         } else {
1130                 /* lanman auth is insecure, it may be disabled */
1131                 if (lp_client_lanman_auth()) {
1132                         lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1133                         SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
1134                                    lm_response.data);
1135                 }
1136
1137                 nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1138                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
1139                              nt_response.data);
1140
1141                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
1142                 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
1143                     && lp_client_lanman_auth()) {
1144                         SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
1145                                         session_key.data);
1146                         dump_data_pw("LM session key\n", session_key.data, session_key.length);
1147                 } else {
1148                         SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, NULL, session_key.data);
1149                         dump_data_pw("NT session key:\n", session_key.data, session_key.length);
1150                 }
1151         }
1152         data_blob_free(&struct_blob);
1153
1154         /* Key exchange encryptes a new client-generated session key with
1155            the password-derived key */
1156         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
1157                 /* Make up a new session key */
1158                 uint8 client_session_key[16];
1159                 generate_random_buffer(client_session_key, sizeof(client_session_key));
1160
1161                 /* Encrypt the new session key with the old one */
1162                 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
1163                 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
1164                 SamOEMhash(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
1165                 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
1166
1167                 /* Mark the new session key as the 'real' session key */
1168                 data_blob_free(&session_key);
1169                 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, client_session_key, sizeof(client_session_key));
1170         }
1171
1172         /* this generates the actual auth packet */
1173         if (!msrpc_gen(next_request, auth_gen_string,
1174                        "NTLMSSP",
1175                        NTLMSSP_AUTH,
1176                        lm_response.data, lm_response.length,
1177                        nt_response.data, nt_response.length,
1178                        ntlmssp_state->domain,
1179                        ntlmssp_state->user,
1180                        ntlmssp_state->get_global_myname(),
1181                        encrypted_session_key.data, encrypted_session_key.length,
1182                        ntlmssp_state->neg_flags)) {
1183
1184                 return NT_STATUS_NO_MEMORY;
1185         }
1186
1187         data_blob_free(&encrypted_session_key);
1188
1189         data_blob_free(&ntlmssp_state->chal);
1190
1191         ntlmssp_state->session_key = session_key;
1192
1193         ntlmssp_state->chal = challenge_blob;
1194         ntlmssp_state->lm_resp = lm_response;
1195         ntlmssp_state->nt_resp = nt_response;
1196
1197         ntlmssp_state->expected_state = NTLMSSP_DONE;
1198
1199         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
1200                 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
1201         }
1202
1203         return nt_status;
1204 }
1205
1206 NTSTATUS ntlmssp_client_start(NTLMSSP_STATE **ntlmssp_state)
1207 {
1208         TALLOC_CTX *mem_ctx;
1209
1210         mem_ctx = talloc_init("NTLMSSP Client context");
1211
1212         *ntlmssp_state = TALLOC_ZERO_P(mem_ctx, NTLMSSP_STATE);
1213         if (!*ntlmssp_state) {
1214                 DEBUG(0,("ntlmssp_client_start: talloc failed!\n"));
1215                 talloc_destroy(mem_ctx);
1216                 return NT_STATUS_NO_MEMORY;
1217         }
1218
1219         (*ntlmssp_state)->role = NTLMSSP_CLIENT;
1220
1221         (*ntlmssp_state)->mem_ctx = mem_ctx;
1222
1223         (*ntlmssp_state)->get_global_myname = global_myname;
1224         (*ntlmssp_state)->get_domain = lp_workgroup;
1225
1226         (*ntlmssp_state)->unicode = True;
1227
1228         (*ntlmssp_state)->use_ntlmv2 = lp_client_ntlmv2_auth();
1229
1230         (*ntlmssp_state)->expected_state = NTLMSSP_INITIAL;
1231
1232         (*ntlmssp_state)->ref_count = 1;
1233
1234         (*ntlmssp_state)->neg_flags =
1235                 NTLMSSP_NEGOTIATE_128 |
1236                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
1237                 NTLMSSP_NEGOTIATE_NTLM |
1238                 NTLMSSP_NEGOTIATE_NTLM2 |
1239                 NTLMSSP_NEGOTIATE_KEY_EXCH |
1240                 NTLMSSP_REQUEST_TARGET;
1241
1242         return NT_STATUS_OK;
1243 }