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 #include "../librpc/gen_ndr/ndr_ntlmssp.h"
  27 #include "libsmb/ntlmssp_ndr.h"
  28
  29 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
  30                                        DATA_BLOB reply, DATA_BLOB *next_request);
  31 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
  32                                          const DATA_BLOB in, DATA_BLOB *out);
  33 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
  34                                          const DATA_BLOB reply, DATA_BLOB *next_request);
  35 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
  36                                     const DATA_BLOB request, DATA_BLOB *reply);
  37
  38 /**
  39  * Callbacks for NTLMSSP - for both client and server operating modes
  40  *
  41  */
  42
  43 static const struct ntlmssp_callbacks {
  44         enum NTLMSSP_ROLE role;
  45         enum NTLM_MESSAGE_TYPE ntlmssp_command;
  46         NTSTATUS (*fn)(struct ntlmssp_state *ntlmssp_state,
  47                        DATA_BLOB in, DATA_BLOB *out);
  48 } ntlmssp_callbacks[] = {
  49         {NTLMSSP_CLIENT, NTLMSSP_INITIAL, ntlmssp_client_initial},
  50         {NTLMSSP_SERVER, NTLMSSP_NEGOTIATE, ntlmssp_server_negotiate},
  51         {NTLMSSP_CLIENT, NTLMSSP_CHALLENGE, ntlmssp_client_challenge},
  52         {NTLMSSP_SERVER, NTLMSSP_AUTH, ntlmssp_server_auth},
  53         {NTLMSSP_CLIENT, NTLMSSP_UNKNOWN, NULL},
  54         {NTLMSSP_SERVER, NTLMSSP_UNKNOWN, NULL}
  55 };
  56
  57
  58 /**
  59  * Print out the NTLMSSP flags for debugging
  60  * @param neg_flags The flags from the packet
  61  */
  62
  63 void debug_ntlmssp_flags(uint32 neg_flags)
  64 {
  65         DEBUG(3,("Got NTLMSSP neg_flags=0x%08x\n", neg_flags));
  66
  67         if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE)
  68                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_UNICODE\n"));
  69         if (neg_flags & NTLMSSP_NEGOTIATE_OEM)
  70                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_OEM\n"));
  71         if (neg_flags & NTLMSSP_REQUEST_TARGET)
  72                 DEBUGADD(4, ("  NTLMSSP_REQUEST_TARGET\n"));
  73         if (neg_flags & NTLMSSP_NEGOTIATE_SIGN)
  74                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_SIGN\n"));
  75         if (neg_flags & NTLMSSP_NEGOTIATE_SEAL)
  76                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_SEAL\n"));
  77         if (neg_flags & NTLMSSP_NEGOTIATE_DATAGRAM)
  78                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_DATAGRAM\n"));
  79         if (neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
  80                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_LM_KEY\n"));
  81         if (neg_flags & NTLMSSP_NEGOTIATE_NETWARE)
  82                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_NETWARE\n"));
  83         if (neg_flags & NTLMSSP_NEGOTIATE_NTLM)
  84                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_NTLM\n"));
  85         if (neg_flags & NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED)
  86                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED\n"));
  87         if (neg_flags & NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED)
  88                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED\n"));
  89         if (neg_flags & NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL)
  90                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL\n"));
  91         if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
  92                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_ALWAYS_SIGN\n"));
  93         if (neg_flags & NTLMSSP_REQUEST_NON_NT_SESSION_KEY)
  94                 DEBUGADD(4, ("  NTLMSSP_REQUEST_NON_NT_SESSION_KEY\n"));
  95         if (neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
  96                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_NTLM2\n"));
  97         if (neg_flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
  98                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_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(ntlmssp_state, &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_NEGOTIATE_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         struct NEGOTIATE_MESSAGE negotiate;
 522         struct CHALLENGE_MESSAGE challenge;
 523
 524         /* parse the NTLMSSP packet */
 525 #if 0
 526         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 527 #endif
 528
 529         if (request.length) {
 530                 if ((request.length < 16) || !msrpc_parse(ntlmssp_state, &request, "Cdd",
 531                                                           "NTLMSSP",
 532                                                           &ntlmssp_command,
 533                                                           &neg_flags)) {
 534                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
 535                                 (unsigned int)request.length));
 536                         dump_data(2, request.data, request.length);
 537                         return NT_STATUS_INVALID_PARAMETER;
 538                 }
 539                 debug_ntlmssp_flags(neg_flags);
 540
 541                 if (DEBUGLEVEL >= 10) {
 542                         if (NT_STATUS_IS_OK(ntlmssp_pull_NEGOTIATE_MESSAGE(&request,
 543                                                        ntlmssp_state,
 544                                                        NULL,
 545                                                        &negotiate)))
 546                         {
 547                                 NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE, &negotiate);
 548                         }
 549                 }
 550         }
 551
 552         ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, lp_lanman_auth());
 553
 554         /* Ask our caller what challenge they would like in the packet */
 555         ntlmssp_state->get_challenge(ntlmssp_state, cryptkey);
 556
 557         /* Check if we may set the challenge */
 558         if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
 559                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 560         }
 561
 562         /* The flags we send back are not just the negotiated flags,
 563          * they are also 'what is in this packet'.  Therfore, we
 564          * operate on 'chal_flags' from here on
 565          */
 566
 567         chal_flags = ntlmssp_state->neg_flags;
 568
 569         /* get the right name to fill in as 'target' */
 570         target_name = ntlmssp_target_name(ntlmssp_state,
 571                                           neg_flags, &chal_flags);
 572         if (target_name == NULL)
 573                 return NT_STATUS_INVALID_PARAMETER;
 574
 575         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
 576         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state,
 577                                                         cryptkey, 8);
 578
 579         /* This should be a 'netbios domain -> DNS domain' mapping */
 580         dnsdomname = get_mydnsdomname(ntlmssp_state);
 581         if (!dnsdomname) {
 582                 dnsdomname = talloc_strdup(ntlmssp_state, "");
 583         }
 584         if (!dnsdomname) {
 585                 return NT_STATUS_NO_MEMORY;
 586         }
 587         strlower_m(dnsdomname);
 588
 589         dnsname = get_mydnsfullname();
 590         if (!dnsname) {
 591                 dnsname = "";
 592         }
 593
 594         /* This creates the 'blob' of names that appears at the end of the packet */
 595         if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
 596         {
 597                 msrpc_gen(ntlmssp_state, &struct_blob, "aaaaa",
 598                           MsvAvNbDomainName, target_name,
 599                           MsvAvNbComputerName, ntlmssp_state->get_global_myname(),
 600                           MsvAvDnsDomainName, dnsdomname,
 601                           MsvAvDnsComputerName, dnsname,
 602                           MsvAvEOL, "");
 603         } else {
 604                 struct_blob = data_blob_null;
 605         }
 606
 607         {
 608                 /* Marshel the packet in the right format, be it unicode or ASCII */
 609                 const char *gen_string;
 610                 if (ntlmssp_state->unicode) {
 611                         gen_string = "CdUdbddB";
 612                 } else {
 613                         gen_string = "CdAdbddB";
 614                 }
 615
 616                 msrpc_gen(ntlmssp_state, reply, gen_string,
 617                           "NTLMSSP",
 618                           NTLMSSP_CHALLENGE,
 619                           target_name,
 620                           chal_flags,
 621                           cryptkey, 8,
 622                           0, 0,
 623                           struct_blob.data, struct_blob.length);
 624
 625                 if (DEBUGLEVEL >= 10) {
 626                         if (NT_STATUS_IS_OK(ntlmssp_pull_CHALLENGE_MESSAGE(reply,
 627                                                        ntlmssp_state,
 628                                                        NULL,
 629                                                        &challenge)))
 630                         {
 631                                 NDR_PRINT_DEBUG(CHALLENGE_MESSAGE, &challenge);
 632                         }
 633                 }
 634         }
 635
 636         data_blob_free(&struct_blob);
 637
 638         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 639
 640         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 641 }
 642
 643 /**
 644  * Next state function for the Authenticate packet
 645  *
 646  * @param ntlmssp_state NTLMSSP State
 647  * @param request The request, as a DATA_BLOB
 648  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 649  * @return Errors or NT_STATUS_OK.
 650  */
 651
 652 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
 653                                     const DATA_BLOB request, DATA_BLOB *reply)
 654 {
 655         DATA_BLOB encrypted_session_key = data_blob_null;
 656         DATA_BLOB user_session_key = data_blob_null;
 657         DATA_BLOB lm_session_key = data_blob_null;
 658         DATA_BLOB session_key = data_blob_null;
 659         uint32 ntlmssp_command, auth_flags;
 660         NTSTATUS nt_status = NT_STATUS_OK;
 661         struct AUTHENTICATE_MESSAGE authenticate;
 662
 663         /* used by NTLM2 */
 664         bool doing_ntlm2 = False;
 665
 666         uchar session_nonce[16];
 667         uchar session_nonce_hash[16];
 668
 669         const char *parse_string;
 670
 671         /* parse the NTLMSSP packet */
 672         *reply = data_blob_null;
 673
 674 #if 0
 675         file_save("ntlmssp_auth.dat", request.data, request.length);
 676 #endif
 677
 678         if (ntlmssp_state->unicode) {
 679                 parse_string = "CdBBUUUBd";
 680         } else {
 681                 parse_string = "CdBBAAABd";
 682         }
 683
 684         data_blob_free(&ntlmssp_state->lm_resp);
 685         data_blob_free(&ntlmssp_state->nt_resp);
 686
 687         ntlmssp_state->user = NULL;
 688         ntlmssp_state->domain = NULL;
 689         ntlmssp_state->workstation = NULL;
 690
 691         /* now the NTLMSSP encoded auth hashes */
 692         if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 693                          "NTLMSSP",
 694                          &ntlmssp_command,
 695                          &ntlmssp_state->lm_resp,
 696                          &ntlmssp_state->nt_resp,
 697                          &ntlmssp_state->domain,
 698                          &ntlmssp_state->user,
 699                          &ntlmssp_state->workstation,
 700                          &encrypted_session_key,
 701                          &auth_flags)) {
 702                 auth_flags = 0;
 703
 704                 /* Try again with a shorter string (Win9X truncates this packet) */
 705                 if (ntlmssp_state->unicode) {
 706                         parse_string = "CdBBUUU";
 707                 } else {
 708                         parse_string = "CdBBAAA";
 709                 }
 710
 711                 /* now the NTLMSSP encoded auth hashes */
 712                 if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 713                                  "NTLMSSP",
 714                                  &ntlmssp_command,
 715                                  &ntlmssp_state->lm_resp,
 716                                  &ntlmssp_state->nt_resp,
 717                                  &ntlmssp_state->domain,
 718                                  &ntlmssp_state->user,
 719                                  &ntlmssp_state->workstation)) {
 720                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
 721                         dump_data(2, request.data, request.length);
 722
 723                         return NT_STATUS_INVALID_PARAMETER;
 724                 }
 725         }
 726
 727         if (auth_flags)
 728                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
 729
 730         if (DEBUGLEVEL >= 10) {
 731                 if (NT_STATUS_IS_OK(ntlmssp_pull_AUTHENTICATE_MESSAGE(&request,
 732                                                   ntlmssp_state,
 733                                                   NULL,
 734                                                   &authenticate)))
 735                 {
 736                         NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE, &authenticate);
 737                 }
 738         }
 739
 740         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 741                  ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
 742
 743 #if 0
 744         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 745         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 746 #endif
 747
 748         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 749            client challenge
 750
 751            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 752         */
 753         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 754                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 755                         struct MD5Context md5_session_nonce_ctx;
 756                         SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
 757
 758                         doing_ntlm2 = True;
 759
 760                         memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
 761                         memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 762
 763                         MD5Init(&md5_session_nonce_ctx);
 764                         MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
 765                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 766
 767                         ntlmssp_state->chal = data_blob_talloc(
 768                                 ntlmssp_state, 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,
 806                                                        NULL, 16);
 807                         hmac_md5(user_session_key.data, session_nonce,
 808                                  sizeof(session_nonce), session_key.data);
 809                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 810                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 811
 812                 } else {
 813                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 814                         session_key = data_blob_null;
 815                 }
 816         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
 817                 if (lm_session_key.data && lm_session_key.length >= 8) {
 818                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 819                                 session_key = data_blob_talloc(ntlmssp_state,
 820                                                                NULL, 16);
 821                                 if (session_key.data == NULL) {
 822                                         return NT_STATUS_NO_MEMORY;
 823                                 }
 824                                 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
 825                                                           session_key.data);
 826                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 827                         } else {
 828                                 uint8 zeros[24];
 829                                 ZERO_STRUCT(zeros);
 830                                 session_key = data_blob_talloc(
 831                                         ntlmssp_state, NULL, 16);
 832                                 if (session_key.data == NULL) {
 833                                         return NT_STATUS_NO_MEMORY;
 834                                 }
 835                                 SMBsesskeygen_lm_sess_key(
 836                                         lm_session_key.data, zeros,
 837                                         session_key.data);
 838                         }
 839                         dump_data_pw("LM session key:\n", session_key.data,
 840                                      session_key.length);
 841                 } else {
 842                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 843                         session_key = data_blob_null;
 844                 }
 845         } else if (user_session_key.data) {
 846                 session_key = user_session_key;
 847                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 848                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 849         } else if (lm_session_key.data) {
 850                 session_key = lm_session_key;
 851                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 852                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 853         } else {
 854                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 855                 session_key = data_blob_null;
 856         }
 857
 858         /* With KEY_EXCH, the client supplies the proposed session key,
 859            but encrypts it with the long-term key */
 860         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 861                 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
 862                         data_blob_free(&encrypted_session_key);
 863                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 864                                   (unsigned int)encrypted_session_key.length));
 865                         return NT_STATUS_INVALID_PARAMETER;
 866                 } else if (!session_key.data || session_key.length != 16) {
 867                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 868                                   (unsigned int)session_key.length));
 869                         ntlmssp_state->session_key = session_key;
 870                 } else {
 871                         dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
 872                         arcfour_crypt_blob(encrypted_session_key.data,
 873                                            encrypted_session_key.length,
 874                                            &session_key);
 875                         ntlmssp_state->session_key = data_blob_talloc(
 876                                 ntlmssp_state, encrypted_session_key.data,
 877                                 encrypted_session_key.length);
 878                         dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
 879                                      encrypted_session_key.length);
 880                 }
 881         } else {
 882                 ntlmssp_state->session_key = session_key;
 883         }
 884
 885         if (!NT_STATUS_IS_OK(nt_status)) {
 886                 ntlmssp_state->session_key = data_blob_null;
 887         } else if (ntlmssp_state->session_key.length) {
 888                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 889         }
 890
 891         data_blob_free(&encrypted_session_key);
 892
 893         /* Only one authentication allowed per server state. */
 894         ntlmssp_state->expected_state = NTLMSSP_DONE;
 895
 896         return nt_status;
 897 }
 898
 899 /**
 900  * Create an NTLMSSP state machine
 901  *
 902  * @param ntlmssp_state NTLMSSP State, allocated by this function
 903  */
 904
 905 NTSTATUS ntlmssp_server_start(NTLMSSP_STATE **ntlmssp_state)
 906 {
 907         *ntlmssp_state = TALLOC_ZERO_P(NULL, NTLMSSP_STATE);
 908         if (!*ntlmssp_state) {
 909                 DEBUG(0,("ntlmssp_server_start: talloc failed!\n"));
 910                 talloc_destroy(*ntlmssp_state);
 911                 return NT_STATUS_NO_MEMORY;
 912         }
 913
 914         (*ntlmssp_state)->role = NTLMSSP_SERVER;
 915
 916         (*ntlmssp_state)->get_challenge = get_challenge;
 917         (*ntlmssp_state)->set_challenge = set_challenge;
 918         (*ntlmssp_state)->may_set_challenge = may_set_challenge;
 919
 920         (*ntlmssp_state)->get_global_myname = global_myname;
 921         (*ntlmssp_state)->get_domain = lp_workgroup;
 922         (*ntlmssp_state)->server_role = ROLE_DOMAIN_MEMBER; /* a good default */
 923
 924         (*ntlmssp_state)->expected_state = NTLMSSP_NEGOTIATE;
 925
 926         (*ntlmssp_state)->ref_count = 1;
 927
 928         (*ntlmssp_state)->neg_flags =
 929                 NTLMSSP_NEGOTIATE_128 |
 930                 NTLMSSP_NEGOTIATE_56 |
 931                 NTLMSSP_NEGOTIATE_VERSION |
 932                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
 933                 NTLMSSP_NEGOTIATE_NTLM |
 934                 NTLMSSP_NEGOTIATE_NTLM2 |
 935                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 936                 NTLMSSP_NEGOTIATE_SIGN |
 937                 NTLMSSP_NEGOTIATE_SEAL;
 938
 939         return NT_STATUS_OK;
 940 }
 941
 942 /*********************************************************************
 943  Client side NTLMSSP
 944 *********************************************************************/
 945
 946 /**
 947  * Next state function for the Initial packet
 948  *
 949  * @param ntlmssp_state NTLMSSP State
 950  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 951  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 952  * @return Errors or NT_STATUS_OK.
 953  */
 954
 955 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
 956                                   DATA_BLOB reply, DATA_BLOB *next_request)
 957 {
 958         struct NEGOTIATE_MESSAGE negotiate;
 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(ntlmssp_state, 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         if (DEBUGLEVEL >= 10) {
 979                 if (NT_STATUS_IS_OK(ntlmssp_pull_NEGOTIATE_MESSAGE(next_request,
 980                                                ntlmssp_state,
 981                                                NULL,
 982                                                &negotiate)))
 983                 {
 984                         NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE, &negotiate);
 985                 }
 986         }
 987
 988         ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
 989
 990         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 991 }
 992
 993 /**
 994  * Next state function for the Challenge Packet.  Generate an auth packet.
 995  *
 996  * @param ntlmssp_state NTLMSSP State
 997  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 998  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 999  * @return Errors or NT_STATUS_OK.
1000  */
1001
1002 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
1003                                          const DATA_BLOB reply, DATA_BLOB *next_request)
1004 {
1005         uint32 chal_flags, ntlmssp_command, unkn1, unkn2;
1006         DATA_BLOB server_domain_blob;
1007         DATA_BLOB challenge_blob;
1008         DATA_BLOB struct_blob = data_blob_null;
1009         char *server_domain;
1010         const char *chal_parse_string;
1011         const char *auth_gen_string;
1012         DATA_BLOB lm_response = data_blob_null;
1013         DATA_BLOB nt_response = data_blob_null;
1014         DATA_BLOB session_key = data_blob_null;
1015         DATA_BLOB encrypted_session_key = data_blob_null;
1016         NTSTATUS nt_status = NT_STATUS_OK;
1017         struct CHALLENGE_MESSAGE challenge;
1018         struct AUTHENTICATE_MESSAGE authenticate;
1019
1020         if (!msrpc_parse(ntlmssp_state, &reply, "CdBd",
1021                          "NTLMSSP",
1022                          &ntlmssp_command,
1023                          &server_domain_blob,
1024                          &chal_flags)) {
1025                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
1026                 dump_data(2, reply.data, reply.length);
1027
1028                 return NT_STATUS_INVALID_PARAMETER;
1029         }
1030
1031         if (DEBUGLEVEL >= 10) {
1032                 if (NT_STATUS_IS_OK(ntlmssp_pull_CHALLENGE_MESSAGE(&reply,
1033                                                ntlmssp_state,
1034                                                NULL,
1035                                                &challenge)))
1036                 {
1037                         NDR_PRINT_DEBUG(CHALLENGE_MESSAGE, &challenge);
1038                 }
1039         }
1040
1041         data_blob_free(&server_domain_blob);
1042
1043         DEBUG(3, ("Got challenge flags:\n"));
1044         debug_ntlmssp_flags(chal_flags);
1045
1046         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
1047
1048         if (ntlmssp_state->unicode) {
1049                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
1050                         chal_parse_string = "CdUdbddB";
1051                 } else {
1052                         chal_parse_string = "CdUdbdd";
1053                 }
1054                 auth_gen_string = "CdBBUUUBd";
1055         } else {
1056                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
1057                         chal_parse_string = "CdAdbddB";
1058                 } else {
1059                         chal_parse_string = "CdAdbdd";
1060                 }
1061
1062                 auth_gen_string = "CdBBAAABd";
1063         }
1064
1065         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
1066         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
1067
1068         if (!msrpc_parse(ntlmssp_state, &reply, chal_parse_string,
1069                          "NTLMSSP",
1070                          &ntlmssp_command,
1071                          &server_domain,
1072                          &chal_flags,
1073                          &challenge_blob, 8,
1074                          &unkn1, &unkn2,
1075                          &struct_blob)) {
1076                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
1077                 dump_data(2, reply.data, reply.length);
1078                 return NT_STATUS_INVALID_PARAMETER;
1079         }
1080
1081         ntlmssp_state->server_domain = server_domain;
1082
1083         if (challenge_blob.length != 8) {
1084                 data_blob_free(&struct_blob);
1085                 return NT_STATUS_INVALID_PARAMETER;
1086         }
1087
1088         if (!ntlmssp_state->nt_hash || !ntlmssp_state->lm_hash) {
1089                 uchar zeros[16];
1090                 /* do nothing - blobs are zero length */
1091
1092                 ZERO_STRUCT(zeros);
1093
1094                 /* session key is all zeros */
1095                 session_key = data_blob_talloc(ntlmssp_state, zeros, 16);
1096
1097                 /* not doing NLTM2 without a password */
1098                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
1099         } else if (ntlmssp_state->use_ntlmv2) {
1100                 if (!struct_blob.length) {
1101                         /* be lazy, match win2k - we can't do NTLMv2 without it */
1102                         DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
1103                         return NT_STATUS_INVALID_PARAMETER;
1104                 }
1105
1106                 /* TODO: if the remote server is standalone, then we should replace 'domain'
1107                    with the server name as supplied above */
1108
1109                 if (!SMBNTLMv2encrypt_hash(ntlmssp_state,
1110                                            ntlmssp_state->user,
1111                                            ntlmssp_state->domain,
1112                                            ntlmssp_state->nt_hash, &challenge_blob,
1113                                            &struct_blob,
1114                                            &lm_response, &nt_response, NULL,
1115                                            &session_key)) {
1116                         data_blob_free(&challenge_blob);
1117                         data_blob_free(&struct_blob);
1118                         return NT_STATUS_NO_MEMORY;
1119                 }
1120         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
1121                 struct MD5Context md5_session_nonce_ctx;
1122                 uchar session_nonce[16];
1123                 uchar session_nonce_hash[16];
1124                 uchar user_session_key[16];
1125
1126                 lm_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1127                 generate_random_buffer(lm_response.data, 8);
1128                 memset(lm_response.data+8, 0, 16);
1129
1130                 memcpy(session_nonce, challenge_blob.data, 8);
1131                 memcpy(&session_nonce[8], lm_response.data, 8);
1132
1133                 MD5Init(&md5_session_nonce_ctx);
1134                 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
1135                 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
1136                 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
1137
1138                 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
1139                 DEBUG(5, ("challenge is: \n"));
1140                 dump_data(5, session_nonce_hash, 8);
1141
1142                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1143                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,
1144                                   session_nonce_hash,
1145                                   nt_response.data);
1146
1147                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
1148
1149                 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, user_session_key);
1150                 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
1151                 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
1152         } else {
1153                 /* lanman auth is insecure, it may be disabled */
1154                 if (lp_client_lanman_auth()) {
1155                         lm_response = data_blob_talloc(ntlmssp_state,
1156                                                        NULL, 24);
1157                         SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
1158                                    lm_response.data);
1159                 }
1160
1161                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1162                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
1163                              nt_response.data);
1164
1165                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
1166                 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
1167                     && lp_client_lanman_auth()) {
1168                         SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
1169                                         session_key.data);
1170                         dump_data_pw("LM session key\n", session_key.data, session_key.length);
1171                 } else {
1172                         SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, session_key.data);
1173                         dump_data_pw("NT session key:\n", session_key.data, session_key.length);
1174                 }
1175         }
1176         data_blob_free(&struct_blob);
1177
1178         /* Key exchange encryptes a new client-generated session key with
1179            the password-derived key */
1180         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
1181                 /* Make up a new session key */
1182                 uint8 client_session_key[16];
1183                 generate_random_buffer(client_session_key, sizeof(client_session_key));
1184
1185                 /* Encrypt the new session key with the old one */
1186                 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
1187                 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
1188                 arcfour_crypt_blob(encrypted_session_key.data, encrypted_session_key.length, &session_key);
1189                 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
1190
1191                 /* Mark the new session key as the 'real' session key */
1192                 data_blob_free(&session_key);
1193                 session_key = data_blob_talloc(ntlmssp_state,
1194                                                client_session_key,
1195                                                sizeof(client_session_key));
1196         }
1197
1198         /* this generates the actual auth packet */
1199         if (!msrpc_gen(ntlmssp_state, next_request, auth_gen_string,
1200                        "NTLMSSP",
1201                        NTLMSSP_AUTH,
1202                        lm_response.data, lm_response.length,
1203                        nt_response.data, nt_response.length,
1204                        ntlmssp_state->domain,
1205                        ntlmssp_state->user,
1206                        ntlmssp_state->get_global_myname(),
1207                        encrypted_session_key.data, encrypted_session_key.length,
1208                        ntlmssp_state->neg_flags)) {
1209
1210                 return NT_STATUS_NO_MEMORY;
1211         }
1212
1213         if (DEBUGLEVEL >= 10) {
1214                 if (NT_STATUS_IS_OK(ntlmssp_pull_AUTHENTICATE_MESSAGE(next_request,
1215                                                   ntlmssp_state,
1216                                                   NULL,
1217                                                   &authenticate)))
1218                 {
1219                         NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE, &authenticate);
1220                 }
1221         }
1222
1223         data_blob_free(&encrypted_session_key);
1224
1225         data_blob_free(&ntlmssp_state->chal);
1226
1227         ntlmssp_state->session_key = session_key;
1228
1229         ntlmssp_state->chal = challenge_blob;
1230         ntlmssp_state->lm_resp = lm_response;
1231         ntlmssp_state->nt_resp = nt_response;
1232
1233         ntlmssp_state->expected_state = NTLMSSP_DONE;
1234
1235         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
1236                 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
1237         }
1238
1239         return nt_status;
1240 }
1241
1242 NTSTATUS ntlmssp_client_start(NTLMSSP_STATE **ntlmssp_state)
1243 {
1244         *ntlmssp_state = TALLOC_ZERO_P(NULL, NTLMSSP_STATE);
1245         if (!*ntlmssp_state) {
1246                 DEBUG(0,("ntlmssp_client_start: talloc failed!\n"));
1247                 talloc_destroy(*ntlmssp_state);
1248                 return NT_STATUS_NO_MEMORY;
1249         }
1250
1251         (*ntlmssp_state)->role = NTLMSSP_CLIENT;
1252
1253         (*ntlmssp_state)->get_global_myname = global_myname;
1254         (*ntlmssp_state)->get_domain = lp_workgroup;
1255
1256         (*ntlmssp_state)->unicode = True;
1257
1258         (*ntlmssp_state)->use_ntlmv2 = lp_client_ntlmv2_auth();
1259
1260         (*ntlmssp_state)->expected_state = NTLMSSP_INITIAL;
1261
1262         (*ntlmssp_state)->ref_count = 1;
1263
1264         (*ntlmssp_state)->neg_flags =
1265                 NTLMSSP_NEGOTIATE_128 |
1266                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
1267                 NTLMSSP_NEGOTIATE_NTLM |
1268                 NTLMSSP_NEGOTIATE_NTLM2 |
1269                 NTLMSSP_NEGOTIATE_KEY_EXCH |
1270                 NTLMSSP_REQUEST_TARGET;
1271
1272         return NT_STATUS_OK;
1273 }