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 #include "../libcli/auth/libcli_auth.h"
  26
  27 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
  28                                        DATA_BLOB reply, DATA_BLOB *next_request);
  29 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
  30                                          const DATA_BLOB in, DATA_BLOB *out);
  31 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
  32                                          const DATA_BLOB reply, DATA_BLOB *next_request);
  33 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
  34                                     const DATA_BLOB request, DATA_BLOB *reply);
  35
  36 /**
  37  * Callbacks for NTLMSSP - for both client and server operating modes
  38  *
  39  */
  40
  41 static const struct ntlmssp_callbacks {
  42         enum NTLMSSP_ROLE role;
  43         enum NTLM_MESSAGE_TYPE ntlmssp_command;
  44         NTSTATUS (*fn)(struct ntlmssp_state *ntlmssp_state,
  45                        DATA_BLOB in, DATA_BLOB *out);
  46 } ntlmssp_callbacks[] = {
  47         {NTLMSSP_CLIENT, NTLMSSP_INITIAL, ntlmssp_client_initial},
  48         {NTLMSSP_SERVER, NTLMSSP_NEGOTIATE, ntlmssp_server_negotiate},
  49         {NTLMSSP_CLIENT, NTLMSSP_CHALLENGE, ntlmssp_client_challenge},
  50         {NTLMSSP_SERVER, NTLMSSP_AUTH, ntlmssp_server_auth},
  51         {NTLMSSP_CLIENT, NTLMSSP_UNKNOWN, NULL},
  52         {NTLMSSP_SERVER, NTLMSSP_UNKNOWN, NULL}
  53 };
  54
  55
  56 /**
  57  * Print out the NTLMSSP flags for debugging
  58  * @param neg_flags The flags from the packet
  59  */
  60
  61 void debug_ntlmssp_flags(uint32 neg_flags)
  62 {
  63         DEBUG(3,("Got NTLMSSP neg_flags=0x%08x\n", neg_flags));
  64
  65         if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE)
  66                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_UNICODE\n"));
  67         if (neg_flags & NTLMSSP_NEGOTIATE_OEM)
  68                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_OEM\n"));
  69         if (neg_flags & NTLMSSP_REQUEST_TARGET)
  70                 DEBUGADD(4, ("  NTLMSSP_REQUEST_TARGET\n"));
  71         if (neg_flags & NTLMSSP_NEGOTIATE_SIGN)
  72                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_SIGN\n"));
  73         if (neg_flags & NTLMSSP_NEGOTIATE_SEAL)
  74                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_SEAL\n"));
  75         if (neg_flags & NTLMSSP_NEGOTIATE_DATAGRAM_STYLE)
  76                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_DATAGRAM_STYLE\n"));
  77         if (neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
  78                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_LM_KEY\n"));
  79         if (neg_flags & NTLMSSP_NEGOTIATE_NETWARE)
  80                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_NETWARE\n"));
  81         if (neg_flags & NTLMSSP_NEGOTIATE_NTLM)
  82                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_NTLM\n"));
  83         if (neg_flags & NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED)
  84                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED\n"));
  85         if (neg_flags & NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED)
  86                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED\n"));
  87         if (neg_flags & NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL)
  88                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL\n"));
  89         if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
  90                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_ALWAYS_SIGN\n"));
  91         if (neg_flags & NTLMSSP_CHAL_ACCEPT_RESPONSE)
  92                 DEBUGADD(4, ("  NTLMSSP_CHAL_ACCEPT_RESPONSE\n"));
  93         if (neg_flags & NTLMSSP_CHAL_NON_NT_SESSION_KEY)
  94                 DEBUGADD(4, ("  NTLMSSP_CHAL_NON_NT_SESSION_KEY\n"));
  95         if (neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
  96                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_NTLM2\n"));
  97         if (neg_flags & NTLMSSP_CHAL_TARGET_INFO)
  98                 DEBUGADD(4, ("  NTLMSSP_CHAL_TARGET_INFO\n"));
  99         if (neg_flags & NTLMSSP_NEGOTIATE_VERSION)
 100                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_VERSION\n"));
 101         if (neg_flags & NTLMSSP_NEGOTIATE_128)
 102                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_128\n"));
 103         if (neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)
 104                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_KEY_EXCH\n"));
 105         if (neg_flags & NTLMSSP_NEGOTIATE_56)
 106                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_56\n"));
 107 }
 108
 109 /**
 110  * Default challenge generation code.
 111  *
 112  */
 113
 114 static void get_challenge(const struct ntlmssp_state *ntlmssp_state,
 115                           uint8_t chal[8])
 116 {
 117         generate_random_buffer(chal, 8);
 118 }
 119
 120 /**
 121  * Default 'we can set the challenge to anything we like' implementation
 122  *
 123  */
 124
 125 static bool may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
 126 {
 127         return True;
 128 }
 129
 130 /**
 131  * Default 'we can set the challenge to anything we like' implementation
 132  *
 133  * Does not actually do anything, as the value is always in the structure anyway.
 134  *
 135  */
 136
 137 static NTSTATUS set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
 138 {
 139         SMB_ASSERT(challenge->length == 8);
 140         return NT_STATUS_OK;
 141 }
 142
 143 /**
 144  * Set a username on an NTLMSSP context - ensures it is talloc()ed
 145  *
 146  */
 147
 148 NTSTATUS ntlmssp_set_username(NTLMSSP_STATE *ntlmssp_state, const char *user)
 149 {
 150         ntlmssp_state->user = talloc_strdup(ntlmssp_state, user ? user : "" );
 151         if (!ntlmssp_state->user) {
 152                 return NT_STATUS_NO_MEMORY;
 153         }
 154         return NT_STATUS_OK;
 155 }
 156
 157 /**
 158  * Store NT and LM hashes on an NTLMSSP context - ensures they are talloc()ed
 159  *
 160  */
 161 NTSTATUS ntlmssp_set_hashes(NTLMSSP_STATE *ntlmssp_state,
 162                 const unsigned char lm_hash[16],
 163                 const unsigned char nt_hash[16])
 164 {
 165         ntlmssp_state->lm_hash = (unsigned char *)
 166                 TALLOC_MEMDUP(ntlmssp_state, lm_hash, 16);
 167         ntlmssp_state->nt_hash = (unsigned char *)
 168                 TALLOC_MEMDUP(ntlmssp_state, nt_hash, 16);
 169         if (!ntlmssp_state->lm_hash || !ntlmssp_state->nt_hash) {
 170                 TALLOC_FREE(ntlmssp_state->lm_hash);
 171                 TALLOC_FREE(ntlmssp_state->nt_hash);
 172                 return NT_STATUS_NO_MEMORY;
 173         }
 174         return NT_STATUS_OK;
 175 }
 176
 177 /**
 178  * Converts a password to the hashes on an NTLMSSP context.
 179  *
 180  */
 181 NTSTATUS ntlmssp_set_password(NTLMSSP_STATE *ntlmssp_state, const char *password)
 182 {
 183         if (!password) {
 184                 ntlmssp_state->lm_hash = NULL;
 185                 ntlmssp_state->nt_hash = NULL;
 186         } else {
 187                 unsigned char lm_hash[16];
 188                 unsigned char nt_hash[16];
 189
 190                 E_deshash(password, lm_hash);
 191                 E_md4hash(password, nt_hash);
 192                 return ntlmssp_set_hashes(ntlmssp_state, lm_hash, nt_hash);
 193         }
 194         return NT_STATUS_OK;
 195 }
 196
 197 /**
 198  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
 199  *
 200  */
 201 NTSTATUS ntlmssp_set_domain(NTLMSSP_STATE *ntlmssp_state, const char *domain)
 202 {
 203         ntlmssp_state->domain = talloc_strdup(ntlmssp_state,
 204                                               domain ? domain : "" );
 205         if (!ntlmssp_state->domain) {
 206                 return NT_STATUS_NO_MEMORY;
 207         }
 208         return NT_STATUS_OK;
 209 }
 210
 211 /**
 212  * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
 213  *
 214  */
 215 NTSTATUS ntlmssp_set_workstation(NTLMSSP_STATE *ntlmssp_state, const char *workstation)
 216 {
 217         ntlmssp_state->workstation = talloc_strdup(ntlmssp_state, workstation);
 218         if (!ntlmssp_state->workstation) {
 219                 return NT_STATUS_NO_MEMORY;
 220         }
 221         return NT_STATUS_OK;
 222 }
 223
 224 /**
 225  *  Store a DATA_BLOB containing an NTLMSSP response, for use later.
 226  *  This copies the data blob
 227  */
 228
 229 NTSTATUS ntlmssp_store_response(NTLMSSP_STATE *ntlmssp_state,
 230                                 DATA_BLOB response)
 231 {
 232         ntlmssp_state->stored_response = data_blob_talloc(ntlmssp_state,
 233                                                           response.data,
 234                                                           response.length);
 235         return NT_STATUS_OK;
 236 }
 237
 238 /**
 239  * Request features for the NTLMSSP negotiation
 240  *
 241  * @param ntlmssp_state NTLMSSP state
 242  * @param feature_list List of space seperated features requested from NTLMSSP.
 243  */
 244 void ntlmssp_want_feature_list(NTLMSSP_STATE *ntlmssp_state, char *feature_list)
 245 {
 246         /*
 247          * We need to set this to allow a later SetPassword
 248          * via the SAMR pipe to succeed. Strange.... We could
 249          * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
 250          */
 251         if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, True)) {
 252                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 253         }
 254         if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, True)) {
 255                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 256         }
 257         if(in_list("NTLMSSP_FEATURE_SEAL", feature_list, True)) {
 258                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 259         }
 260 }
 261
 262 /**
 263  * Request a feature for the NTLMSSP negotiation
 264  *
 265  * @param ntlmssp_state NTLMSSP state
 266  * @param feature Bit flag specifying the requested feature
 267  */
 268 void ntlmssp_want_feature(NTLMSSP_STATE *ntlmssp_state, uint32 feature)
 269 {
 270         /* As per JRA's comment above */
 271         if (feature & NTLMSSP_FEATURE_SESSION_KEY) {
 272                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 273         }
 274         if (feature & NTLMSSP_FEATURE_SIGN) {
 275                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 276         }
 277         if (feature & NTLMSSP_FEATURE_SEAL) {
 278                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 279         }
 280 }
 281
 282 /**
 283  * Next state function for the NTLMSSP state machine
 284  *
 285  * @param ntlmssp_state NTLMSSP State
 286  * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
 287  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 288  * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
 289  */
 290
 291 NTSTATUS ntlmssp_update(NTLMSSP_STATE *ntlmssp_state,
 292                         const DATA_BLOB in, DATA_BLOB *out)
 293 {
 294         DATA_BLOB input;
 295         uint32 ntlmssp_command;
 296         int i;
 297
 298         if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
 299                 /* Called update after negotiations finished. */
 300                 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
 301                 return NT_STATUS_INVALID_PARAMETER;
 302         }
 303
 304         *out = data_blob_null;
 305
 306         if (!in.length && ntlmssp_state->stored_response.length) {
 307                 input = ntlmssp_state->stored_response;
 308
 309                 /* we only want to read the stored response once - overwrite it */
 310                 ntlmssp_state->stored_response = data_blob_null;
 311         } else {
 312                 input = in;
 313         }
 314
 315         if (!input.length) {
 316                 switch (ntlmssp_state->role) {
 317                 case NTLMSSP_CLIENT:
 318                         ntlmssp_command = NTLMSSP_INITIAL;
 319                         break;
 320                 case NTLMSSP_SERVER:
 321                         /* 'datagram' mode - no neg packet */
 322                         ntlmssp_command = NTLMSSP_NEGOTIATE;
 323                         break;
 324                 }
 325         } else {
 326                 if (!msrpc_parse(NULL, &input, "Cd",
 327                                  "NTLMSSP",
 328                                  &ntlmssp_command)) {
 329                         DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
 330                         dump_data(2, input.data, input.length);
 331                         return NT_STATUS_INVALID_PARAMETER;
 332                 }
 333         }
 334
 335         if (ntlmssp_command != ntlmssp_state->expected_state) {
 336                 DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
 337                 return NT_STATUS_INVALID_PARAMETER;
 338         }
 339
 340         for (i=0; ntlmssp_callbacks[i].fn; i++) {
 341                 if (ntlmssp_callbacks[i].role == ntlmssp_state->role
 342                     && ntlmssp_callbacks[i].ntlmssp_command == ntlmssp_command) {
 343                         return ntlmssp_callbacks[i].fn(ntlmssp_state, input, out);
 344                 }
 345         }
 346
 347         DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
 348                   ntlmssp_state->role, ntlmssp_command));
 349
 350         return NT_STATUS_INVALID_PARAMETER;
 351 }
 352
 353 /**
 354  * End an NTLMSSP state machine
 355  *
 356  * @param ntlmssp_state NTLMSSP State, free()ed by this function
 357  */
 358
 359 void ntlmssp_end(NTLMSSP_STATE **ntlmssp_state)
 360 {
 361         (*ntlmssp_state)->ref_count--;
 362
 363         if ((*ntlmssp_state)->ref_count == 0) {
 364                 data_blob_free(&(*ntlmssp_state)->chal);
 365                 data_blob_free(&(*ntlmssp_state)->lm_resp);
 366                 data_blob_free(&(*ntlmssp_state)->nt_resp);
 367                 TALLOC_FREE(*ntlmssp_state);
 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_NEGOTIATE_VERSION)) {
 453                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_VERSION;
 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         uint8_t cryptkey[8];
 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(NULL, &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         ntlmssp_state->get_challenge(ntlmssp_state, cryptkey);
 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, cryptkey, 8);
 564         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state,
 565                                                         cryptkey, 8);
 566
 567         /* This should be a 'netbios domain -> DNS domain' mapping */
 568         dnsdomname = get_mydnsdomname(ntlmssp_state);
 569         if (!dnsdomname) {
 570                 dnsdomname = talloc_strdup(ntlmssp_state, "");
 571         }
 572         if (!dnsdomname) {
 573                 return NT_STATUS_NO_MEMORY;
 574         }
 575         strlower_m(dnsdomname);
 576
 577         dnsname = get_mydnsfullname();
 578         if (!dnsname) {
 579                 dnsname = "";
 580         }
 581
 582         /* This creates the 'blob' of names that appears at the end of the packet */
 583         if (chal_flags & NTLMSSP_CHAL_TARGET_INFO)
 584         {
 585                 msrpc_gen(NULL, &struct_blob, "aaaaa",
 586                           NTLMSSP_NAME_TYPE_DOMAIN, target_name,
 587                           NTLMSSP_NAME_TYPE_SERVER, ntlmssp_state->get_global_myname(),
 588                           NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
 589                           NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
 590                           0, "");
 591         } else {
 592                 struct_blob = data_blob_null;
 593         }
 594
 595         {
 596                 /* Marshel the packet in the right format, be it unicode or ASCII */
 597                 const char *gen_string;
 598                 if (ntlmssp_state->unicode) {
 599                         gen_string = "CdUdbddB";
 600                 } else {
 601                         gen_string = "CdAdbddB";
 602                 }
 603
 604                 msrpc_gen(NULL, reply, gen_string,
 605                           "NTLMSSP",
 606                           NTLMSSP_CHALLENGE,
 607                           target_name,
 608                           chal_flags,
 609                           cryptkey, 8,
 610                           0, 0,
 611                           struct_blob.data, struct_blob.length);
 612         }
 613
 614         data_blob_free(&struct_blob);
 615
 616         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 617
 618         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 619 }
 620
 621 /**
 622  * Next state function for the Authenticate packet
 623  *
 624  * @param ntlmssp_state NTLMSSP State
 625  * @param request The request, as a DATA_BLOB
 626  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 627  * @return Errors or NT_STATUS_OK.
 628  */
 629
 630 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
 631                                     const DATA_BLOB request, DATA_BLOB *reply)
 632 {
 633         DATA_BLOB encrypted_session_key = data_blob_null;
 634         DATA_BLOB user_session_key = data_blob_null;
 635         DATA_BLOB lm_session_key = data_blob_null;
 636         DATA_BLOB session_key = data_blob_null;
 637         uint32 ntlmssp_command, auth_flags;
 638         NTSTATUS nt_status = NT_STATUS_OK;
 639
 640         /* used by NTLM2 */
 641         bool doing_ntlm2 = False;
 642
 643         uchar session_nonce[16];
 644         uchar session_nonce_hash[16];
 645
 646         const char *parse_string;
 647         char *domain = NULL;
 648         char *user = NULL;
 649         char *workstation = NULL;
 650
 651         /* parse the NTLMSSP packet */
 652         *reply = data_blob_null;
 653
 654 #if 0
 655         file_save("ntlmssp_auth.dat", request.data, request.length);
 656 #endif
 657
 658         if (ntlmssp_state->unicode) {
 659                 parse_string = "CdBBUUUBd";
 660         } else {
 661                 parse_string = "CdBBAAABd";
 662         }
 663
 664         data_blob_free(&ntlmssp_state->lm_resp);
 665         data_blob_free(&ntlmssp_state->nt_resp);
 666
 667         ntlmssp_state->user = NULL;
 668         ntlmssp_state->domain = NULL;
 669         ntlmssp_state->workstation = NULL;
 670
 671         /* now the NTLMSSP encoded auth hashes */
 672         if (!msrpc_parse(NULL, &request, parse_string,
 673                          "NTLMSSP",
 674                          &ntlmssp_command,
 675                          &ntlmssp_state->lm_resp,
 676                          &ntlmssp_state->nt_resp,
 677                          &domain,
 678                          &user,
 679                          &workstation,
 680                          &encrypted_session_key,
 681                          &auth_flags)) {
 682                 SAFE_FREE(domain);
 683                 SAFE_FREE(user);
 684                 SAFE_FREE(workstation);
 685                 data_blob_free(&encrypted_session_key);
 686                 auth_flags = 0;
 687
 688                 /* Try again with a shorter string (Win9X truncates this packet) */
 689                 if (ntlmssp_state->unicode) {
 690                         parse_string = "CdBBUUU";
 691                 } else {
 692                         parse_string = "CdBBAAA";
 693                 }
 694
 695                 /* now the NTLMSSP encoded auth hashes */
 696                 if (!msrpc_parse(NULL, &request, parse_string,
 697                                  "NTLMSSP",
 698                                  &ntlmssp_command,
 699                                  &ntlmssp_state->lm_resp,
 700                                  &ntlmssp_state->nt_resp,
 701                                  &domain,
 702                                  &user,
 703                                  &workstation)) {
 704                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
 705                         dump_data(2, request.data, request.length);
 706                         SAFE_FREE(domain);
 707                         SAFE_FREE(user);
 708                         SAFE_FREE(workstation);
 709
 710                         return NT_STATUS_INVALID_PARAMETER;
 711                 }
 712         }
 713
 714         if (auth_flags)
 715                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
 716
 717         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, domain))) {
 718                 SAFE_FREE(domain);
 719                 SAFE_FREE(user);
 720                 SAFE_FREE(workstation);
 721                 data_blob_free(&encrypted_session_key);
 722                 return nt_status;
 723         }
 724
 725         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(ntlmssp_state, user))) {
 726                 SAFE_FREE(domain);
 727                 SAFE_FREE(user);
 728                 SAFE_FREE(workstation);
 729                 data_blob_free(&encrypted_session_key);
 730                 return nt_status;
 731         }
 732
 733         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(ntlmssp_state, workstation))) {
 734                 SAFE_FREE(domain);
 735                 SAFE_FREE(user);
 736                 SAFE_FREE(workstation);
 737                 data_blob_free(&encrypted_session_key);
 738                 return nt_status;
 739         }
 740
 741         SAFE_FREE(domain);
 742         SAFE_FREE(user);
 743         SAFE_FREE(workstation);
 744
 745         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 746                  ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
 747
 748 #if 0
 749         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 750         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 751 #endif
 752
 753         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 754            client challenge
 755
 756            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 757         */
 758         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 759                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 760                         struct MD5Context md5_session_nonce_ctx;
 761                         SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
 762
 763                         doing_ntlm2 = True;
 764
 765                         memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
 766                         memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 767
 768                         MD5Init(&md5_session_nonce_ctx);
 769                         MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
 770                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 771
 772                         ntlmssp_state->chal = data_blob_talloc(
 773                                 ntlmssp_state, session_nonce_hash, 8);
 774
 775                         /* LM response is no longer useful */
 776                         data_blob_free(&ntlmssp_state->lm_resp);
 777
 778                         /* We changed the effective challenge - set it */
 779                         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
 780                                 data_blob_free(&encrypted_session_key);
 781                                 return nt_status;
 782                         }
 783
 784                         /* LM Key is incompatible. */
 785                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 786                 }
 787         }
 788
 789         /*
 790          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 791          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 792          * smb.conf file) and no NTLMv2 response was sent then the password check
 793          * will fail here. JRA.
 794          */
 795
 796         /* Finally, actually ask if the password is OK */
 797
 798         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
 799                                                                        &user_session_key, &lm_session_key))) {
 800                 data_blob_free(&encrypted_session_key);
 801                 return nt_status;
 802         }
 803
 804         dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
 805         dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
 806
 807         /* Handle the different session key derivation for NTLM2 */
 808         if (doing_ntlm2) {
 809                 if (user_session_key.data && user_session_key.length == 16) {
 810                         session_key = data_blob_talloc(ntlmssp_state,
 811                                                        NULL, 16);
 812                         hmac_md5(user_session_key.data, session_nonce,
 813                                  sizeof(session_nonce), session_key.data);
 814                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 815                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 816
 817                 } else {
 818                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 819                         session_key = data_blob_null;
 820                 }
 821         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
 822                 if (lm_session_key.data && lm_session_key.length >= 8) {
 823                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 824                                 session_key = data_blob_talloc(ntlmssp_state,
 825                                                                NULL, 16);
 826                                 if (session_key.data == NULL) {
 827                                         return NT_STATUS_NO_MEMORY;
 828                                 }
 829                                 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
 830                                                           session_key.data);
 831                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 832                         } else {
 833                                 uint8 zeros[24];
 834                                 ZERO_STRUCT(zeros);
 835                                 session_key = data_blob_talloc(
 836                                         ntlmssp_state, NULL, 16);
 837                                 if (session_key.data == NULL) {
 838                                         return NT_STATUS_NO_MEMORY;
 839                                 }
 840                                 SMBsesskeygen_lm_sess_key(
 841                                         lm_session_key.data, zeros,
 842                                         session_key.data);
 843                         }
 844                         dump_data_pw("LM session key:\n", session_key.data,
 845                                      session_key.length);
 846                 } else {
 847                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 848                         session_key = data_blob_null;
 849                 }
 850         } else if (user_session_key.data) {
 851                 session_key = user_session_key;
 852                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 853                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 854         } else if (lm_session_key.data) {
 855                 session_key = lm_session_key;
 856                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 857                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 858         } else {
 859                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 860                 session_key = data_blob_null;
 861         }
 862
 863         /* With KEY_EXCH, the client supplies the proposed session key,
 864            but encrypts it with the long-term key */
 865         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 866                 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
 867                         data_blob_free(&encrypted_session_key);
 868                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 869                                   (unsigned int)encrypted_session_key.length));
 870                         return NT_STATUS_INVALID_PARAMETER;
 871                 } else if (!session_key.data || session_key.length != 16) {
 872                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 873                                   (unsigned int)session_key.length));
 874                         ntlmssp_state->session_key = session_key;
 875                 } else {
 876                         dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
 877                         arcfour_crypt_blob(encrypted_session_key.data,
 878                                            encrypted_session_key.length,
 879                                            &session_key);
 880                         ntlmssp_state->session_key = data_blob_talloc(
 881                                 ntlmssp_state, encrypted_session_key.data,
 882                                 encrypted_session_key.length);
 883                         dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
 884                                      encrypted_session_key.length);
 885                 }
 886         } else {
 887                 ntlmssp_state->session_key = session_key;
 888         }
 889
 890         if (!NT_STATUS_IS_OK(nt_status)) {
 891                 ntlmssp_state->session_key = data_blob_null;
 892         } else if (ntlmssp_state->session_key.length) {
 893                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 894         }
 895
 896         data_blob_free(&encrypted_session_key);
 897
 898         /* Only one authentication allowed per server state. */
 899         ntlmssp_state->expected_state = NTLMSSP_DONE;
 900
 901         return nt_status;
 902 }
 903
 904 /**
 905  * Create an NTLMSSP state machine
 906  *
 907  * @param ntlmssp_state NTLMSSP State, allocated by this function
 908  */
 909
 910 NTSTATUS ntlmssp_server_start(NTLMSSP_STATE **ntlmssp_state)
 911 {
 912         *ntlmssp_state = TALLOC_ZERO_P(NULL, NTLMSSP_STATE);
 913         if (!*ntlmssp_state) {
 914                 DEBUG(0,("ntlmssp_server_start: talloc failed!\n"));
 915                 talloc_destroy(*ntlmssp_state);
 916                 return NT_STATUS_NO_MEMORY;
 917         }
 918
 919         (*ntlmssp_state)->role = NTLMSSP_SERVER;
 920
 921         (*ntlmssp_state)->get_challenge = get_challenge;
 922         (*ntlmssp_state)->set_challenge = set_challenge;
 923         (*ntlmssp_state)->may_set_challenge = may_set_challenge;
 924
 925         (*ntlmssp_state)->get_global_myname = global_myname;
 926         (*ntlmssp_state)->get_domain = lp_workgroup;
 927         (*ntlmssp_state)->server_role = ROLE_DOMAIN_MEMBER; /* a good default */
 928
 929         (*ntlmssp_state)->expected_state = NTLMSSP_NEGOTIATE;
 930
 931         (*ntlmssp_state)->ref_count = 1;
 932
 933         (*ntlmssp_state)->neg_flags =
 934                 NTLMSSP_NEGOTIATE_128 |
 935                 NTLMSSP_NEGOTIATE_56 |
 936                 NTLMSSP_NEGOTIATE_VERSION |
 937                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
 938                 NTLMSSP_NEGOTIATE_NTLM |
 939                 NTLMSSP_NEGOTIATE_NTLM2 |
 940                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 941                 NTLMSSP_NEGOTIATE_SIGN |
 942                 NTLMSSP_NEGOTIATE_SEAL;
 943
 944         return NT_STATUS_OK;
 945 }
 946
 947 /*********************************************************************
 948  Client side NTLMSSP
 949 *********************************************************************/
 950
 951 /**
 952  * Next state function for the Initial packet
 953  *
 954  * @param ntlmssp_state NTLMSSP State
 955  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 956  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 957  * @return Errors or NT_STATUS_OK.
 958  */
 959
 960 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
 961                                   DATA_BLOB reply, DATA_BLOB *next_request)
 962 {
 963         if (ntlmssp_state->unicode) {
 964                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 965         } else {
 966                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 967         }
 968
 969         if (ntlmssp_state->use_ntlmv2) {
 970                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 971         }
 972
 973         /* generate the ntlmssp negotiate packet */
 974         msrpc_gen(NULL, next_request, "CddAA",
 975                   "NTLMSSP",
 976                   NTLMSSP_NEGOTIATE,
 977                   ntlmssp_state->neg_flags,
 978                   ntlmssp_state->get_domain(),
 979                   ntlmssp_state->get_global_myname());
 980
 981         ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
 982
 983         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 984 }
 985
 986 /**
 987  * Next state function for the Challenge Packet.  Generate an auth packet.
 988  *
 989  * @param ntlmssp_state NTLMSSP State
 990  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 991  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 992  * @return Errors or NT_STATUS_OK.
 993  */
 994
 995 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
 996                                          const DATA_BLOB reply, DATA_BLOB *next_request)
 997 {
 998         uint32 chal_flags, ntlmssp_command, unkn1, unkn2;
 999         DATA_BLOB server_domain_blob;
1000         DATA_BLOB challenge_blob;
1001         DATA_BLOB struct_blob = data_blob_null;
1002         char *server_domain;
1003         const char *chal_parse_string;
1004         const char *auth_gen_string;
1005         DATA_BLOB lm_response = data_blob_null;
1006         DATA_BLOB nt_response = data_blob_null;
1007         DATA_BLOB session_key = data_blob_null;
1008         DATA_BLOB encrypted_session_key = data_blob_null;
1009         NTSTATUS nt_status = NT_STATUS_OK;
1010
1011         if (!msrpc_parse(NULL, &reply, "CdBd",
1012                          "NTLMSSP",
1013                          &ntlmssp_command,
1014                          &server_domain_blob,
1015                          &chal_flags)) {
1016                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
1017                 dump_data(2, reply.data, reply.length);
1018
1019                 return NT_STATUS_INVALID_PARAMETER;
1020         }
1021
1022         data_blob_free(&server_domain_blob);
1023
1024         DEBUG(3, ("Got challenge flags:\n"));
1025         debug_ntlmssp_flags(chal_flags);
1026
1027         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
1028
1029         if (ntlmssp_state->unicode) {
1030                 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
1031                         chal_parse_string = "CdUdbddB";
1032                 } else {
1033                         chal_parse_string = "CdUdbdd";
1034                 }
1035                 auth_gen_string = "CdBBUUUBd";
1036         } else {
1037                 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
1038                         chal_parse_string = "CdAdbddB";
1039                 } else {
1040                         chal_parse_string = "CdAdbdd";
1041                 }
1042
1043                 auth_gen_string = "CdBBAAABd";
1044         }
1045
1046         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
1047         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
1048
1049         if (!msrpc_parse(NULL, &reply, chal_parse_string,
1050                          "NTLMSSP",
1051                          &ntlmssp_command,
1052                          &server_domain,
1053                          &chal_flags,
1054                          &challenge_blob, 8,
1055                          &unkn1, &unkn2,
1056                          &struct_blob)) {
1057                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
1058                 dump_data(2, reply.data, reply.length);
1059                 return NT_STATUS_INVALID_PARAMETER;
1060         }
1061
1062         ntlmssp_state->server_domain = talloc_strdup(ntlmssp_state,
1063                                                      server_domain);
1064
1065         SAFE_FREE(server_domain);
1066         if (challenge_blob.length != 8) {
1067                 data_blob_free(&struct_blob);
1068                 return NT_STATUS_INVALID_PARAMETER;
1069         }
1070
1071         if (!ntlmssp_state->nt_hash || !ntlmssp_state->lm_hash) {
1072                 uchar zeros[16];
1073                 /* do nothing - blobs are zero length */
1074
1075                 ZERO_STRUCT(zeros);
1076
1077                 /* session key is all zeros */
1078                 session_key = data_blob_talloc(ntlmssp_state, zeros, 16);
1079
1080                 /* not doing NLTM2 without a password */
1081                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
1082         } else if (ntlmssp_state->use_ntlmv2) {
1083                 if (!struct_blob.length) {
1084                         /* be lazy, match win2k - we can't do NTLMv2 without it */
1085                         DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
1086                         return NT_STATUS_INVALID_PARAMETER;
1087                 }
1088
1089                 /* TODO: if the remote server is standalone, then we should replace 'domain'
1090                    with the server name as supplied above */
1091
1092                 if (!SMBNTLMv2encrypt_hash(ntlmssp_state,
1093                                            ntlmssp_state->user,
1094                                            ntlmssp_state->domain,
1095                                            ntlmssp_state->nt_hash, &challenge_blob,
1096                                            &struct_blob,
1097                                            &lm_response, &nt_response, NULL,
1098                                            &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, 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, 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                 arcfour_crypt_blob(encrypted_session_key.data, encrypted_session_key.length, &session_key);
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(NULL, 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 }