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 "ntlmssp.h"
  26 #include "../libcli/auth/libcli_auth.h"
  27 #include "../librpc/gen_ndr/ndr_ntlmssp.h"
  28 #include "../libcli/auth/ntlmssp_ndr.h"
  29
  30 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
  31                                        DATA_BLOB reply, DATA_BLOB *next_request);
  32 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
  33                                          const DATA_BLOB in, DATA_BLOB *out);
  34 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
  35                                          const DATA_BLOB reply, DATA_BLOB *next_request);
  36 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
  37                                     const DATA_BLOB request, DATA_BLOB *reply);
  38
  39 /**
  40  * Callbacks for NTLMSSP - for both client and server operating modes
  41  *
  42  */
  43
  44 static const struct ntlmssp_callbacks {
  45         enum ntlmssp_role role;
  46         enum ntlmssp_message_type ntlmssp_command;
  47         NTSTATUS (*fn)(struct ntlmssp_state *ntlmssp_state,
  48                        DATA_BLOB in, DATA_BLOB *out);
  49 } ntlmssp_callbacks[] = {
  50         {NTLMSSP_CLIENT, NTLMSSP_INITIAL, ntlmssp_client_initial},
  51         {NTLMSSP_SERVER, NTLMSSP_NEGOTIATE, ntlmssp_server_negotiate},
  52         {NTLMSSP_CLIENT, NTLMSSP_CHALLENGE, ntlmssp_client_challenge},
  53         {NTLMSSP_SERVER, NTLMSSP_AUTH, ntlmssp_server_auth},
  54         {NTLMSSP_CLIENT, NTLMSSP_UNKNOWN, NULL},
  55         {NTLMSSP_SERVER, NTLMSSP_UNKNOWN, NULL}
  56 };
  57
  58
  59 /**
  60  * Print out the NTLMSSP flags for debugging
  61  * @param neg_flags The flags from the packet
  62  */
  63
  64 void debug_ntlmssp_flags(uint32 neg_flags)
  65 {
  66         DEBUG(3,("Got NTLMSSP neg_flags=0x%08x\n", neg_flags));
  67
  68         if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE)
  69                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_UNICODE\n"));
  70         if (neg_flags & NTLMSSP_NEGOTIATE_OEM)
  71                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_OEM\n"));
  72         if (neg_flags & NTLMSSP_REQUEST_TARGET)
  73                 DEBUGADD(4, ("  NTLMSSP_REQUEST_TARGET\n"));
  74         if (neg_flags & NTLMSSP_NEGOTIATE_SIGN)
  75                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_SIGN\n"));
  76         if (neg_flags & NTLMSSP_NEGOTIATE_SEAL)
  77                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_SEAL\n"));
  78         if (neg_flags & NTLMSSP_NEGOTIATE_DATAGRAM)
  79                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_DATAGRAM\n"));
  80         if (neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
  81                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_LM_KEY\n"));
  82         if (neg_flags & NTLMSSP_NEGOTIATE_NETWARE)
  83                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_NETWARE\n"));
  84         if (neg_flags & NTLMSSP_NEGOTIATE_NTLM)
  85                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_NTLM\n"));
  86         if (neg_flags & NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED)
  87                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED\n"));
  88         if (neg_flags & NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED)
  89                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED\n"));
  90         if (neg_flags & NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL)
  91                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL\n"));
  92         if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
  93                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_ALWAYS_SIGN\n"));
  94         if (neg_flags & NTLMSSP_REQUEST_NON_NT_SESSION_KEY)
  95                 DEBUGADD(4, ("  NTLMSSP_REQUEST_NON_NT_SESSION_KEY\n"));
  96         if (neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
  97                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_NTLM2\n"));
  98         if (neg_flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
  99                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_TARGET_INFO\n"));
 100         if (neg_flags & NTLMSSP_NEGOTIATE_VERSION)
 101                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_VERSION\n"));
 102         if (neg_flags & NTLMSSP_NEGOTIATE_128)
 103                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_128\n"));
 104         if (neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)
 105                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_KEY_EXCH\n"));
 106         if (neg_flags & NTLMSSP_NEGOTIATE_56)
 107                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_56\n"));
 108 }
 109
 110 /**
 111  * Default challenge generation code.
 112  *
 113  */
 114
 115 static NTSTATUS get_challenge(const struct ntlmssp_state *ntlmssp_state,
 116                               uint8_t chal[8])
 117 {
 118         generate_random_buffer(chal, 8);
 119         return NT_STATUS_OK;
 120 }
 121
 122 /**
 123  * Default 'we can set the challenge to anything we like' implementation
 124  *
 125  */
 126
 127 static bool may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
 128 {
 129         return True;
 130 }
 131
 132 /**
 133  * Default 'we can set the challenge to anything we like' implementation
 134  *
 135  * Does not actually do anything, as the value is always in the structure anyway.
 136  *
 137  */
 138
 139 static NTSTATUS set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
 140 {
 141         SMB_ASSERT(challenge->length == 8);
 142         return NT_STATUS_OK;
 143 }
 144
 145 /**
 146  * Set a username on an NTLMSSP context - ensures it is talloc()ed
 147  *
 148  */
 149
 150 NTSTATUS ntlmssp_set_username(struct ntlmssp_state *ntlmssp_state, const char *user)
 151 {
 152         ntlmssp_state->user = talloc_strdup(ntlmssp_state, user ? user : "" );
 153         if (!ntlmssp_state->user) {
 154                 return NT_STATUS_NO_MEMORY;
 155         }
 156         return NT_STATUS_OK;
 157 }
 158
 159 /**
 160  * Store NT and LM hashes on an NTLMSSP context - ensures they are talloc()ed
 161  *
 162  */
 163 NTSTATUS ntlmssp_set_hashes(struct ntlmssp_state *ntlmssp_state,
 164                 const unsigned char lm_hash[16],
 165                 const unsigned char nt_hash[16])
 166 {
 167         ntlmssp_state->lm_hash = (unsigned char *)
 168                 TALLOC_MEMDUP(ntlmssp_state, lm_hash, 16);
 169         ntlmssp_state->nt_hash = (unsigned char *)
 170                 TALLOC_MEMDUP(ntlmssp_state, nt_hash, 16);
 171         if (!ntlmssp_state->lm_hash || !ntlmssp_state->nt_hash) {
 172                 TALLOC_FREE(ntlmssp_state->lm_hash);
 173                 TALLOC_FREE(ntlmssp_state->nt_hash);
 174                 return NT_STATUS_NO_MEMORY;
 175         }
 176         return NT_STATUS_OK;
 177 }
 178
 179 /**
 180  * Converts a password to the hashes on an NTLMSSP context.
 181  *
 182  */
 183 NTSTATUS ntlmssp_set_password(struct ntlmssp_state *ntlmssp_state, const char *password)
 184 {
 185         if (!password) {
 186                 ntlmssp_state->lm_hash = NULL;
 187                 ntlmssp_state->nt_hash = NULL;
 188         } else {
 189                 unsigned char lm_hash[16];
 190                 unsigned char nt_hash[16];
 191
 192                 E_deshash(password, lm_hash);
 193                 E_md4hash(password, nt_hash);
 194                 return ntlmssp_set_hashes(ntlmssp_state, lm_hash, nt_hash);
 195         }
 196         return NT_STATUS_OK;
 197 }
 198
 199 /**
 200  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
 201  *
 202  */
 203 NTSTATUS ntlmssp_set_domain(struct ntlmssp_state *ntlmssp_state, const char *domain)
 204 {
 205         ntlmssp_state->domain = talloc_strdup(ntlmssp_state,
 206                                               domain ? domain : "" );
 207         if (!ntlmssp_state->domain) {
 208                 return NT_STATUS_NO_MEMORY;
 209         }
 210         return NT_STATUS_OK;
 211 }
 212
 213 /**
 214  * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
 215  *
 216  */
 217 NTSTATUS ntlmssp_set_workstation(struct ntlmssp_state *ntlmssp_state, const char *workstation)
 218 {
 219         ntlmssp_state->workstation = talloc_strdup(ntlmssp_state, workstation);
 220         if (!ntlmssp_state->workstation) {
 221                 return NT_STATUS_NO_MEMORY;
 222         }
 223         return NT_STATUS_OK;
 224 }
 225
 226 /**
 227  * Request features for the NTLMSSP negotiation
 228  *
 229  * @param ntlmssp_state NTLMSSP state
 230  * @param feature_list List of space seperated features requested from NTLMSSP.
 231  */
 232 void ntlmssp_want_feature_list(struct ntlmssp_state *ntlmssp_state, char *feature_list)
 233 {
 234         /*
 235          * We need to set this to allow a later SetPassword
 236          * via the SAMR pipe to succeed. Strange.... We could
 237          * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
 238          */
 239         if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, True)) {
 240                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 241         }
 242         if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, True)) {
 243                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 244         }
 245         if(in_list("NTLMSSP_FEATURE_SEAL", feature_list, True)) {
 246                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 247         }
 248         if (in_list("NTLMSSP_FEATURE_CCACHE", feature_list, true)) {
 249                 ntlmssp_state->use_ccache = true;
 250         }
 251 }
 252
 253 /**
 254  * Request a feature for the NTLMSSP negotiation
 255  *
 256  * @param ntlmssp_state NTLMSSP state
 257  * @param feature Bit flag specifying the requested feature
 258  */
 259 void ntlmssp_want_feature(struct ntlmssp_state *ntlmssp_state, uint32 feature)
 260 {
 261         /* As per JRA's comment above */
 262         if (feature & NTLMSSP_FEATURE_SESSION_KEY) {
 263                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 264         }
 265         if (feature & NTLMSSP_FEATURE_SIGN) {
 266                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 267         }
 268         if (feature & NTLMSSP_FEATURE_SEAL) {
 269                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 270         }
 271         if (feature & NTLMSSP_FEATURE_CCACHE) {
 272                 ntlmssp_state->use_ccache = true;
 273         }
 274 }
 275
 276 /**
 277  * Next state function for the NTLMSSP state machine
 278  *
 279  * @param ntlmssp_state NTLMSSP State
 280  * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
 281  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 282  * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
 283  */
 284
 285 NTSTATUS ntlmssp_update(struct ntlmssp_state *ntlmssp_state,
 286                         const DATA_BLOB input, DATA_BLOB *out)
 287 {
 288         uint32 ntlmssp_command;
 289         int i;
 290
 291         if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
 292                 /* Called update after negotiations finished. */
 293                 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
 294                 return NT_STATUS_INVALID_PARAMETER;
 295         }
 296
 297         *out = data_blob_null;
 298
 299         if (!input.length) {
 300                 switch (ntlmssp_state->role) {
 301                 case NTLMSSP_CLIENT:
 302                         ntlmssp_command = NTLMSSP_INITIAL;
 303                         break;
 304                 case NTLMSSP_SERVER:
 305                         /* 'datagram' mode - no neg packet */
 306                         ntlmssp_command = NTLMSSP_NEGOTIATE;
 307                         break;
 308                 }
 309         } else {
 310                 if (!msrpc_parse(ntlmssp_state, &input, "Cd",
 311                                  "NTLMSSP",
 312                                  &ntlmssp_command)) {
 313                         DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
 314                         dump_data(2, input.data, input.length);
 315                         return NT_STATUS_INVALID_PARAMETER;
 316                 }
 317         }
 318
 319         if (ntlmssp_command != ntlmssp_state->expected_state) {
 320                 DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
 321                 return NT_STATUS_INVALID_PARAMETER;
 322         }
 323
 324         for (i=0; ntlmssp_callbacks[i].fn; i++) {
 325                 if (ntlmssp_callbacks[i].role == ntlmssp_state->role
 326                     && ntlmssp_callbacks[i].ntlmssp_command == ntlmssp_command) {
 327                         return ntlmssp_callbacks[i].fn(ntlmssp_state, input, out);
 328                 }
 329         }
 330
 331         DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
 332                   ntlmssp_state->role, ntlmssp_command));
 333
 334         return NT_STATUS_INVALID_PARAMETER;
 335 }
 336
 337 /**
 338  * End an NTLMSSP state machine
 339  *
 340  * @param ntlmssp_state NTLMSSP State, free()ed by this function
 341  */
 342
 343 void ntlmssp_end(struct ntlmssp_state **ntlmssp_state)
 344 {
 345         data_blob_free(&(*ntlmssp_state)->chal);
 346         data_blob_free(&(*ntlmssp_state)->lm_resp);
 347         data_blob_free(&(*ntlmssp_state)->nt_resp);
 348         TALLOC_FREE(*ntlmssp_state);
 349
 350         *ntlmssp_state = NULL;
 351         return;
 352 }
 353
 354 /**
 355  * Determine correct target name flags for reply, given server role
 356  * and negotiated flags
 357  *
 358  * @param ntlmssp_state NTLMSSP State
 359  * @param neg_flags The flags from the packet
 360  * @param chal_flags The flags to be set in the reply packet
 361  * @return The 'target name' string.
 362  */
 363
 364 static const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
 365                                        uint32 neg_flags, uint32 *chal_flags)
 366 {
 367         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
 368                 *chal_flags |= NTLMSSP_NEGOTIATE_TARGET_INFO;
 369                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
 370                 if (ntlmssp_state->server.is_standalone) {
 371                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
 372                         return ntlmssp_state->server.netbios_name;
 373                 } else {
 374                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
 375                         return ntlmssp_state->server.netbios_domain;
 376                 };
 377         } else {
 378                 return "";
 379         }
 380 }
 381
 382 static void ntlmssp_handle_neg_flags(struct ntlmssp_state *ntlmssp_state,
 383                                       uint32 neg_flags, bool allow_lm) {
 384         if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
 385                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 386                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_OEM;
 387                 ntlmssp_state->unicode = True;
 388         } else {
 389                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_UNICODE;
 390                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 391                 ntlmssp_state->unicode = False;
 392         }
 393
 394         if ((neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && allow_lm) {
 395                 /* other end forcing us to use LM */
 396                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
 397                 ntlmssp_state->use_ntlmv2 = False;
 398         } else {
 399                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 400         }
 401
 402         if (!(neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)) {
 403                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 404         }
 405
 406         if (!(neg_flags & NTLMSSP_NEGOTIATE_NTLM2)) {
 407                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 408         }
 409
 410         if (!(neg_flags & NTLMSSP_NEGOTIATE_128)) {
 411                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_128;
 412         }
 413
 414         if (!(neg_flags & NTLMSSP_NEGOTIATE_56)) {
 415                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_56;
 416         }
 417
 418         if (!(neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)) {
 419                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_KEY_EXCH;
 420         }
 421
 422         if (!(neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
 423                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN;
 424         }
 425
 426         if (!(neg_flags & NTLMSSP_NEGOTIATE_SEAL)) {
 427                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SEAL;
 428         }
 429
 430         /* Woop Woop - unknown flag for Windows compatibility...
 431            What does this really do ? JRA. */
 432         if (!(neg_flags & NTLMSSP_NEGOTIATE_VERSION)) {
 433                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_VERSION;
 434         }
 435
 436         if ((neg_flags & NTLMSSP_REQUEST_TARGET)) {
 437                 ntlmssp_state->neg_flags |= NTLMSSP_REQUEST_TARGET;
 438         }
 439 }
 440
 441 /**
 442  Weaken NTLMSSP keys to cope with down-level clients and servers.
 443
 444  We probably should have some parameters to control this, but as
 445  it only occours for LM_KEY connections, and this is controlled
 446  by the client lanman auth/lanman auth parameters, it isn't too bad.
 447 */
 448
 449 DATA_BLOB ntlmssp_weaken_keys(struct ntlmssp_state *ntlmssp_state, TALLOC_CTX *mem_ctx)
 450 {
 451         DATA_BLOB weakened_key = data_blob_talloc(mem_ctx,
 452                                         ntlmssp_state->session_key.data,
 453                                         ntlmssp_state->session_key.length);
 454
 455         /* Nothing to weaken.  We certainly don't want to 'extend' the length... */
 456         if (weakened_key.length < 16) {
 457                 /* perhaps there was no key? */
 458                 return weakened_key;
 459         }
 460
 461         /* Key weakening not performed on the master key for NTLM2
 462            and does not occour for NTLM1.  Therefore we only need
 463            to do this for the LM_KEY.
 464         */
 465
 466         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
 467                 /* LM key doesn't support 128 bit crypto, so this is
 468                  * the best we can do.  If you negotiate 128 bit, but
 469                  * not 56, you end up with 40 bit... */
 470                 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
 471                         weakened_key.data[7] = 0xa0;
 472                 } else { /* forty bits */
 473                         weakened_key.data[5] = 0xe5;
 474                         weakened_key.data[6] = 0x38;
 475                         weakened_key.data[7] = 0xb0;
 476                 }
 477                 weakened_key.length = 8;
 478         }
 479         return weakened_key;
 480 }
 481
 482 /**
 483  * Next state function for the Negotiate packet
 484  *
 485  * @param ntlmssp_state NTLMSSP State
 486  * @param request The request, as a DATA_BLOB
 487  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 488  * @return Errors or MORE_PROCESSING_REQUIRED if a reply is sent.
 489  */
 490
 491 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
 492                                          const DATA_BLOB request, DATA_BLOB *reply)
 493 {
 494         DATA_BLOB struct_blob;
 495         uint32 neg_flags = 0;
 496         uint32 ntlmssp_command, chal_flags;
 497         uint8_t cryptkey[8];
 498         const char *target_name;
 499         struct NEGOTIATE_MESSAGE negotiate;
 500         struct CHALLENGE_MESSAGE challenge;
 501         NTSTATUS status;
 502
 503         /* parse the NTLMSSP packet */
 504 #if 0
 505         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 506 #endif
 507
 508         if (request.length) {
 509                 if ((request.length < 16) || !msrpc_parse(ntlmssp_state, &request, "Cdd",
 510                                                           "NTLMSSP",
 511                                                           &ntlmssp_command,
 512                                                           &neg_flags)) {
 513                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
 514                                 (unsigned int)request.length));
 515                         dump_data(2, request.data, request.length);
 516                         return NT_STATUS_INVALID_PARAMETER;
 517                 }
 518                 debug_ntlmssp_flags(neg_flags);
 519
 520                 if (DEBUGLEVEL >= 10) {
 521                         if (NT_STATUS_IS_OK(ntlmssp_pull_NEGOTIATE_MESSAGE(&request,
 522                                                        ntlmssp_state,
 523                                                        NULL,
 524                                                        &negotiate)))
 525                         {
 526                                 NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE, &negotiate);
 527                         }
 528                 }
 529         }
 530
 531         ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, lp_lanman_auth());
 532
 533         /* Ask our caller what challenge they would like in the packet */
 534         status = ntlmssp_state->get_challenge(ntlmssp_state, cryptkey);
 535         if (!NT_STATUS_IS_OK(status)) {
 536                 return status;
 537         }
 538
 539         /* Check if we may set the challenge */
 540         if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
 541                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 542         }
 543
 544         /* The flags we send back are not just the negotiated flags,
 545          * they are also 'what is in this packet'.  Therfore, we
 546          * operate on 'chal_flags' from here on
 547          */
 548
 549         chal_flags = ntlmssp_state->neg_flags;
 550
 551         /* get the right name to fill in as 'target' */
 552         target_name = ntlmssp_target_name(ntlmssp_state,
 553                                           neg_flags, &chal_flags);
 554         if (target_name == NULL)
 555                 return NT_STATUS_INVALID_PARAMETER;
 556
 557         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
 558         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state,
 559                                                         cryptkey, 8);
 560
 561         /* This creates the 'blob' of names that appears at the end of the packet */
 562         if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
 563         {
 564                 msrpc_gen(ntlmssp_state, &struct_blob, "aaaaa",
 565                           MsvAvNbDomainName, target_name,
 566                           MsvAvNbComputerName, ntlmssp_state->server.netbios_name,
 567                           MsvAvDnsDomainName, ntlmssp_state->server.dns_domain,
 568                           MsvAvDnsComputerName, ntlmssp_state->server.dns_name,
 569                           MsvAvEOL, "");
 570         } else {
 571                 struct_blob = data_blob_null;
 572         }
 573
 574         {
 575                 /* Marshel the packet in the right format, be it unicode or ASCII */
 576                 const char *gen_string;
 577                 if (ntlmssp_state->unicode) {
 578                         gen_string = "CdUdbddB";
 579                 } else {
 580                         gen_string = "CdAdbddB";
 581                 }
 582
 583                 msrpc_gen(ntlmssp_state, reply, gen_string,
 584                           "NTLMSSP",
 585                           NTLMSSP_CHALLENGE,
 586                           target_name,
 587                           chal_flags,
 588                           cryptkey, 8,
 589                           0, 0,
 590                           struct_blob.data, struct_blob.length);
 591
 592                 if (DEBUGLEVEL >= 10) {
 593                         if (NT_STATUS_IS_OK(ntlmssp_pull_CHALLENGE_MESSAGE(reply,
 594                                                        ntlmssp_state,
 595                                                        NULL,
 596                                                        &challenge)))
 597                         {
 598                                 NDR_PRINT_DEBUG(CHALLENGE_MESSAGE, &challenge);
 599                         }
 600                 }
 601         }
 602
 603         data_blob_free(&struct_blob);
 604
 605         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 606
 607         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 608 }
 609
 610 /**
 611  * Next state function for the Authenticate packet
 612  *
 613  * @param ntlmssp_state NTLMSSP State
 614  * @param request The request, as a DATA_BLOB
 615  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 616  * @return Errors or NT_STATUS_OK.
 617  */
 618
 619 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
 620                                     const DATA_BLOB request, DATA_BLOB *reply)
 621 {
 622         DATA_BLOB encrypted_session_key = data_blob_null;
 623         DATA_BLOB user_session_key = data_blob_null;
 624         DATA_BLOB lm_session_key = data_blob_null;
 625         DATA_BLOB session_key = data_blob_null;
 626         uint32 ntlmssp_command, auth_flags;
 627         NTSTATUS nt_status = NT_STATUS_OK;
 628         struct AUTHENTICATE_MESSAGE authenticate;
 629
 630         /* used by NTLM2 */
 631         bool doing_ntlm2 = False;
 632
 633         uchar session_nonce[16];
 634         uchar session_nonce_hash[16];
 635
 636         const char *parse_string;
 637
 638         /* parse the NTLMSSP packet */
 639         *reply = data_blob_null;
 640
 641 #if 0
 642         file_save("ntlmssp_auth.dat", request.data, request.length);
 643 #endif
 644
 645         if (ntlmssp_state->unicode) {
 646                 parse_string = "CdBBUUUBd";
 647         } else {
 648                 parse_string = "CdBBAAABd";
 649         }
 650
 651         data_blob_free(&ntlmssp_state->lm_resp);
 652         data_blob_free(&ntlmssp_state->nt_resp);
 653
 654         ntlmssp_state->user = NULL;
 655         ntlmssp_state->domain = NULL;
 656         ntlmssp_state->workstation = NULL;
 657
 658         /* now the NTLMSSP encoded auth hashes */
 659         if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 660                          "NTLMSSP",
 661                          &ntlmssp_command,
 662                          &ntlmssp_state->lm_resp,
 663                          &ntlmssp_state->nt_resp,
 664                          &ntlmssp_state->domain,
 665                          &ntlmssp_state->user,
 666                          &ntlmssp_state->workstation,
 667                          &encrypted_session_key,
 668                          &auth_flags)) {
 669                 auth_flags = 0;
 670
 671                 /* Try again with a shorter string (Win9X truncates this packet) */
 672                 if (ntlmssp_state->unicode) {
 673                         parse_string = "CdBBUUU";
 674                 } else {
 675                         parse_string = "CdBBAAA";
 676                 }
 677
 678                 /* now the NTLMSSP encoded auth hashes */
 679                 if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 680                                  "NTLMSSP",
 681                                  &ntlmssp_command,
 682                                  &ntlmssp_state->lm_resp,
 683                                  &ntlmssp_state->nt_resp,
 684                                  &ntlmssp_state->domain,
 685                                  &ntlmssp_state->user,
 686                                  &ntlmssp_state->workstation)) {
 687                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
 688                         dump_data(2, request.data, request.length);
 689
 690                         return NT_STATUS_INVALID_PARAMETER;
 691                 }
 692         }
 693
 694         if (auth_flags)
 695                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
 696
 697         if (DEBUGLEVEL >= 10) {
 698                 if (NT_STATUS_IS_OK(ntlmssp_pull_AUTHENTICATE_MESSAGE(&request,
 699                                                   ntlmssp_state,
 700                                                   NULL,
 701                                                   &authenticate)))
 702                 {
 703                         NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE, &authenticate);
 704                 }
 705         }
 706
 707         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 708                  ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
 709
 710 #if 0
 711         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 712         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 713 #endif
 714
 715         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 716            client challenge
 717
 718            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 719         */
 720         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 721                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 722                         struct MD5Context md5_session_nonce_ctx;
 723                         SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
 724
 725                         doing_ntlm2 = True;
 726
 727                         memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
 728                         memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 729
 730                         MD5Init(&md5_session_nonce_ctx);
 731                         MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
 732                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 733
 734                         ntlmssp_state->chal = data_blob_talloc(
 735                                 ntlmssp_state, session_nonce_hash, 8);
 736
 737                         /* LM response is no longer useful */
 738                         data_blob_free(&ntlmssp_state->lm_resp);
 739
 740                         /* We changed the effective challenge - set it */
 741                         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
 742                                 data_blob_free(&encrypted_session_key);
 743                                 return nt_status;
 744                         }
 745
 746                         /* LM Key is incompatible. */
 747                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 748                 }
 749         }
 750
 751         /*
 752          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 753          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 754          * smb.conf file) and no NTLMv2 response was sent then the password check
 755          * will fail here. JRA.
 756          */
 757
 758         /* Finally, actually ask if the password is OK */
 759
 760         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
 761                                                                        &user_session_key, &lm_session_key))) {
 762                 data_blob_free(&encrypted_session_key);
 763                 return nt_status;
 764         }
 765
 766         dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
 767         dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
 768
 769         /* Handle the different session key derivation for NTLM2 */
 770         if (doing_ntlm2) {
 771                 if (user_session_key.data && user_session_key.length == 16) {
 772                         session_key = data_blob_talloc(ntlmssp_state,
 773                                                        NULL, 16);
 774                         hmac_md5(user_session_key.data, session_nonce,
 775                                  sizeof(session_nonce), session_key.data);
 776                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 777                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 778
 779                 } else {
 780                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 781                         session_key = data_blob_null;
 782                 }
 783         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
 784                 if (lm_session_key.data && lm_session_key.length >= 8) {
 785                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 786                                 session_key = data_blob_talloc(ntlmssp_state,
 787                                                                NULL, 16);
 788                                 if (session_key.data == NULL) {
 789                                         return NT_STATUS_NO_MEMORY;
 790                                 }
 791                                 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
 792                                                           session_key.data);
 793                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 794                         } else {
 795                                 static const uint8 zeros[24] = {0, };
 796                                 session_key = data_blob_talloc(
 797                                         ntlmssp_state, NULL, 16);
 798                                 if (session_key.data == NULL) {
 799                                         return NT_STATUS_NO_MEMORY;
 800                                 }
 801                                 SMBsesskeygen_lm_sess_key(
 802                                         lm_session_key.data, zeros,
 803                                         session_key.data);
 804                         }
 805                         dump_data_pw("LM session key:\n", session_key.data,
 806                                      session_key.length);
 807                 } else {
 808                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 809                         session_key = data_blob_null;
 810                 }
 811         } else if (user_session_key.data) {
 812                 session_key = user_session_key;
 813                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 814                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 815         } else if (lm_session_key.data) {
 816                 session_key = lm_session_key;
 817                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 818                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 819         } else {
 820                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 821                 session_key = data_blob_null;
 822         }
 823
 824         /* With KEY_EXCH, the client supplies the proposed session key,
 825            but encrypts it with the long-term key */
 826         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 827                 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
 828                         data_blob_free(&encrypted_session_key);
 829                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 830                                   (unsigned int)encrypted_session_key.length));
 831                         return NT_STATUS_INVALID_PARAMETER;
 832                 } else if (!session_key.data || session_key.length != 16) {
 833                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 834                                   (unsigned int)session_key.length));
 835                         ntlmssp_state->session_key = session_key;
 836                 } else {
 837                         dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
 838                         arcfour_crypt_blob(encrypted_session_key.data,
 839                                            encrypted_session_key.length,
 840                                            &session_key);
 841                         ntlmssp_state->session_key = data_blob_talloc(
 842                                 ntlmssp_state, encrypted_session_key.data,
 843                                 encrypted_session_key.length);
 844                         dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
 845                                      encrypted_session_key.length);
 846                 }
 847         } else {
 848                 ntlmssp_state->session_key = session_key;
 849         }
 850
 851         if (!NT_STATUS_IS_OK(nt_status)) {
 852                 ntlmssp_state->session_key = data_blob_null;
 853         } else if (ntlmssp_state->session_key.length) {
 854                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 855         }
 856
 857         data_blob_free(&encrypted_session_key);
 858
 859         /* Only one authentication allowed per server state. */
 860         ntlmssp_state->expected_state = NTLMSSP_DONE;
 861
 862         return nt_status;
 863 }
 864
 865 /**
 866  * Create an NTLMSSP state machine
 867  *
 868  * @param ntlmssp_state NTLMSSP State, allocated by this function
 869  */
 870
 871 NTSTATUS ntlmssp_server_start(TALLOC_CTX *mem_ctx,
 872                               bool is_standalone,
 873                               const char *netbios_name,
 874                               const char *netbios_domain,
 875                               const char *dns_name,
 876                               const char *dns_domain,
 877                               struct ntlmssp_state **_ntlmssp_state)
 878 {
 879         struct ntlmssp_state *ntlmssp_state;
 880
 881         if (!netbios_name) {
 882                 netbios_name = "";
 883         }
 884
 885         if (!netbios_domain) {
 886                 netbios_domain = "";
 887         }
 888
 889         if (!dns_domain) {
 890                 dns_domain = "";
 891         }
 892
 893         if (!dns_name) {
 894                 dns_name = "";
 895         }
 896
 897         ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
 898         if (!ntlmssp_state) {
 899                 return NT_STATUS_NO_MEMORY;
 900         }
 901
 902         ntlmssp_state->role = NTLMSSP_SERVER;
 903
 904         ntlmssp_state->get_challenge = get_challenge;
 905         ntlmssp_state->set_challenge = set_challenge;
 906         ntlmssp_state->may_set_challenge = may_set_challenge;
 907
 908         ntlmssp_state->server.is_standalone = is_standalone;
 909
 910         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 911
 912         ntlmssp_state->neg_flags =
 913                 NTLMSSP_NEGOTIATE_128 |
 914                 NTLMSSP_NEGOTIATE_56 |
 915                 NTLMSSP_NEGOTIATE_VERSION |
 916                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
 917                 NTLMSSP_NEGOTIATE_NTLM |
 918                 NTLMSSP_NEGOTIATE_NTLM2 |
 919                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 920                 NTLMSSP_NEGOTIATE_SIGN |
 921                 NTLMSSP_NEGOTIATE_SEAL;
 922
 923         ntlmssp_state->server.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
 924         if (!ntlmssp_state->server.netbios_name) {
 925                 talloc_free(ntlmssp_state);
 926                 return NT_STATUS_NO_MEMORY;
 927         }
 928         ntlmssp_state->server.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
 929         if (!ntlmssp_state->server.netbios_domain) {
 930                 talloc_free(ntlmssp_state);
 931                 return NT_STATUS_NO_MEMORY;
 932         }
 933         ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state, dns_name);
 934         if (!ntlmssp_state->server.dns_name) {
 935                 talloc_free(ntlmssp_state);
 936                 return NT_STATUS_NO_MEMORY;
 937         }
 938         ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state, dns_domain);
 939         if (!ntlmssp_state->server.dns_domain) {
 940                 talloc_free(ntlmssp_state);
 941                 return NT_STATUS_NO_MEMORY;
 942         }
 943
 944         *_ntlmssp_state = ntlmssp_state;
 945         return NT_STATUS_OK;
 946 }
 947
 948 /*********************************************************************
 949  Client side NTLMSSP
 950 *********************************************************************/
 951
 952 /**
 953  * Next state function for the Initial packet
 954  *
 955  * @param ntlmssp_state NTLMSSP State
 956  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 957  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 958  * @return Errors or NT_STATUS_OK.
 959  */
 960
 961 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
 962                                   DATA_BLOB reply, DATA_BLOB *next_request)
 963 {
 964         struct NEGOTIATE_MESSAGE negotiate;
 965
 966         if (ntlmssp_state->unicode) {
 967                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 968         } else {
 969                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 970         }
 971
 972         if (ntlmssp_state->use_ntlmv2) {
 973                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 974         }
 975
 976         /* generate the ntlmssp negotiate packet */
 977         msrpc_gen(ntlmssp_state, next_request, "CddAA",
 978                   "NTLMSSP",
 979                   NTLMSSP_NEGOTIATE,
 980                   ntlmssp_state->neg_flags,
 981                   ntlmssp_state->client.netbios_domain,
 982                   ntlmssp_state->client.netbios_name);
 983
 984         if (DEBUGLEVEL >= 10) {
 985                 if (NT_STATUS_IS_OK(ntlmssp_pull_NEGOTIATE_MESSAGE(next_request,
 986                                                ntlmssp_state,
 987                                                NULL,
 988                                                &negotiate)))
 989                 {
 990                         NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE, &negotiate);
 991                 }
 992         }
 993
 994         ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
 995
 996         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 997 }
 998
 999 /**
1000  * Next state function for the Challenge Packet.  Generate an auth packet.
1001  *
1002  * @param ntlmssp_state NTLMSSP State
1003  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
1004  * @param request The reply, as an allocated DATA_BLOB, caller to free.
1005  * @return Errors or NT_STATUS_OK.
1006  */
1007
1008 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
1009                                          const DATA_BLOB reply, DATA_BLOB *next_request)
1010 {
1011         uint32 chal_flags, ntlmssp_command, unkn1, unkn2;
1012         DATA_BLOB server_domain_blob;
1013         DATA_BLOB challenge_blob;
1014         DATA_BLOB struct_blob = data_blob_null;
1015         char *server_domain;
1016         const char *chal_parse_string;
1017         const char *auth_gen_string;
1018         DATA_BLOB lm_response = data_blob_null;
1019         DATA_BLOB nt_response = data_blob_null;
1020         DATA_BLOB session_key = data_blob_null;
1021         DATA_BLOB encrypted_session_key = data_blob_null;
1022         NTSTATUS nt_status = NT_STATUS_OK;
1023         struct CHALLENGE_MESSAGE challenge;
1024         struct AUTHENTICATE_MESSAGE authenticate;
1025
1026         if (ntlmssp_state->use_ccache) {
1027                 struct wbcCredentialCacheParams params;
1028                 struct wbcCredentialCacheInfo *info = NULL;
1029                 struct wbcAuthErrorInfo *error = NULL;
1030                 struct wbcNamedBlob auth_blob;
1031                 struct wbcBlob *wbc_next = NULL;
1032                 struct wbcBlob *wbc_session_key = NULL;
1033                 wbcErr wbc_status;
1034                 int i;
1035
1036                 params.account_name = ntlmssp_state->user;
1037                 params.domain_name = ntlmssp_state->domain;
1038                 params.level = WBC_CREDENTIAL_CACHE_LEVEL_NTLMSSP;
1039
1040                 auth_blob.name = "challenge_blob";
1041                 auth_blob.flags = 0;
1042                 auth_blob.blob.data = reply.data;
1043                 auth_blob.blob.length = reply.length;
1044                 params.num_blobs = 1;
1045                 params.blobs = &auth_blob;
1046
1047                 wbc_status = wbcCredentialCache(&params, &info, &error);
1048                 if (error != NULL) {
1049                         wbcFreeMemory(error);
1050                 }
1051                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1052                         goto noccache;
1053                 }
1054
1055                 for (i=0; i<info->num_blobs; i++) {
1056                         if (strequal(info->blobs[i].name, "auth_blob")) {
1057                                 wbc_next = &info->blobs[i].blob;
1058                         }
1059                         if (strequal(info->blobs[i].name, "session_key")) {
1060                                 wbc_session_key = &info->blobs[i].blob;
1061                         }
1062                 }
1063                 if ((wbc_next == NULL) || (wbc_session_key == NULL)) {
1064                         wbcFreeMemory(info);
1065                         goto noccache;
1066                 }
1067
1068                 *next_request = data_blob(wbc_next->data, wbc_next->length);
1069                 ntlmssp_state->session_key = data_blob(
1070                         wbc_session_key->data, wbc_session_key->length);
1071
1072                 wbcFreeMemory(info);
1073                 goto done;
1074         }
1075
1076 noccache:
1077
1078         if (!msrpc_parse(ntlmssp_state, &reply, "CdBd",
1079                          "NTLMSSP",
1080                          &ntlmssp_command,
1081                          &server_domain_blob,
1082                          &chal_flags)) {
1083                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
1084                 dump_data(2, reply.data, reply.length);
1085
1086                 return NT_STATUS_INVALID_PARAMETER;
1087         }
1088
1089         if (DEBUGLEVEL >= 10) {
1090                 if (NT_STATUS_IS_OK(ntlmssp_pull_CHALLENGE_MESSAGE(&reply,
1091                                                ntlmssp_state,
1092                                                NULL,
1093                                                &challenge)))
1094                 {
1095                         NDR_PRINT_DEBUG(CHALLENGE_MESSAGE, &challenge);
1096                 }
1097         }
1098
1099         data_blob_free(&server_domain_blob);
1100
1101         DEBUG(3, ("Got challenge flags:\n"));
1102         debug_ntlmssp_flags(chal_flags);
1103
1104         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
1105
1106         if (ntlmssp_state->unicode) {
1107                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
1108                         chal_parse_string = "CdUdbddB";
1109                 } else {
1110                         chal_parse_string = "CdUdbdd";
1111                 }
1112                 auth_gen_string = "CdBBUUUBd";
1113         } else {
1114                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
1115                         chal_parse_string = "CdAdbddB";
1116                 } else {
1117                         chal_parse_string = "CdAdbdd";
1118                 }
1119
1120                 auth_gen_string = "CdBBAAABd";
1121         }
1122
1123         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
1124         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
1125
1126         if (!msrpc_parse(ntlmssp_state, &reply, chal_parse_string,
1127                          "NTLMSSP",
1128                          &ntlmssp_command,
1129                          &server_domain,
1130                          &chal_flags,
1131                          &challenge_blob, 8,
1132                          &unkn1, &unkn2,
1133                          &struct_blob)) {
1134                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
1135                 dump_data(2, reply.data, reply.length);
1136                 return NT_STATUS_INVALID_PARAMETER;
1137         }
1138
1139         if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
1140                 ntlmssp_state->server.is_standalone = true;
1141         } else {
1142                 ntlmssp_state->server.is_standalone = false;
1143         }
1144         /* TODO: parse struct_blob and fill in the rest */
1145         ntlmssp_state->server.netbios_name = "";
1146         ntlmssp_state->server.netbios_domain = server_domain;
1147         ntlmssp_state->server.dns_name = "";
1148         ntlmssp_state->server.dns_domain = "";
1149
1150         if (challenge_blob.length != 8) {
1151                 data_blob_free(&struct_blob);
1152                 return NT_STATUS_INVALID_PARAMETER;
1153         }
1154
1155         if (!ntlmssp_state->nt_hash || !ntlmssp_state->lm_hash) {
1156                 static const uint8_t zeros[16] = {0, };
1157                 /* do nothing - blobs are zero length */
1158
1159                 /* session key is all zeros */
1160                 session_key = data_blob_talloc(ntlmssp_state, zeros, 16);
1161
1162                 /* not doing NLTM2 without a password */
1163                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
1164         } else if (ntlmssp_state->use_ntlmv2) {
1165                 if (!struct_blob.length) {
1166                         /* be lazy, match win2k - we can't do NTLMv2 without it */
1167                         DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
1168                         return NT_STATUS_INVALID_PARAMETER;
1169                 }
1170
1171                 /* TODO: if the remote server is standalone, then we should replace 'domain'
1172                    with the server name as supplied above */
1173
1174                 if (!SMBNTLMv2encrypt_hash(ntlmssp_state,
1175                                            ntlmssp_state->user,
1176                                            ntlmssp_state->domain,
1177                                            ntlmssp_state->nt_hash, &challenge_blob,
1178                                            &struct_blob,
1179                                            &lm_response, &nt_response, NULL,
1180                                            &session_key)) {
1181                         data_blob_free(&challenge_blob);
1182                         data_blob_free(&struct_blob);
1183                         return NT_STATUS_NO_MEMORY;
1184                 }
1185         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
1186                 struct MD5Context md5_session_nonce_ctx;
1187                 uchar session_nonce[16];
1188                 uchar session_nonce_hash[16];
1189                 uchar user_session_key[16];
1190
1191                 lm_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1192                 generate_random_buffer(lm_response.data, 8);
1193                 memset(lm_response.data+8, 0, 16);
1194
1195                 memcpy(session_nonce, challenge_blob.data, 8);
1196                 memcpy(&session_nonce[8], lm_response.data, 8);
1197
1198                 MD5Init(&md5_session_nonce_ctx);
1199                 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
1200                 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
1201                 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
1202
1203                 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
1204                 DEBUG(5, ("challenge is: \n"));
1205                 dump_data(5, session_nonce_hash, 8);
1206
1207                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1208                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,
1209                                   session_nonce_hash,
1210                                   nt_response.data);
1211
1212                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
1213
1214                 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, user_session_key);
1215                 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
1216                 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
1217         } else {
1218                 /* lanman auth is insecure, it may be disabled */
1219                 if (lp_client_lanman_auth()) {
1220                         lm_response = data_blob_talloc(ntlmssp_state,
1221                                                        NULL, 24);
1222                         SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
1223                                    lm_response.data);
1224                 }
1225
1226                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1227                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
1228                              nt_response.data);
1229
1230                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
1231                 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
1232                     && lp_client_lanman_auth()) {
1233                         SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
1234                                         session_key.data);
1235                         dump_data_pw("LM session key\n", session_key.data, session_key.length);
1236                 } else {
1237                         SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, session_key.data);
1238                         dump_data_pw("NT session key:\n", session_key.data, session_key.length);
1239                 }
1240         }
1241         data_blob_free(&struct_blob);
1242
1243         /* Key exchange encryptes a new client-generated session key with
1244            the password-derived key */
1245         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
1246                 /* Make up a new session key */
1247                 uint8 client_session_key[16];
1248                 generate_random_buffer(client_session_key, sizeof(client_session_key));
1249
1250                 /* Encrypt the new session key with the old one */
1251                 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
1252                 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
1253                 arcfour_crypt_blob(encrypted_session_key.data, encrypted_session_key.length, &session_key);
1254                 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
1255
1256                 /* Mark the new session key as the 'real' session key */
1257                 data_blob_free(&session_key);
1258                 session_key = data_blob_talloc(ntlmssp_state,
1259                                                client_session_key,
1260                                                sizeof(client_session_key));
1261         }
1262
1263         /* this generates the actual auth packet */
1264         if (!msrpc_gen(ntlmssp_state, next_request, auth_gen_string,
1265                        "NTLMSSP",
1266                        NTLMSSP_AUTH,
1267                        lm_response.data, lm_response.length,
1268                        nt_response.data, nt_response.length,
1269                        ntlmssp_state->domain,
1270                        ntlmssp_state->user,
1271                        ntlmssp_state->client.netbios_name,
1272                        encrypted_session_key.data, encrypted_session_key.length,
1273                        ntlmssp_state->neg_flags)) {
1274
1275                 return NT_STATUS_NO_MEMORY;
1276         }
1277
1278         if (DEBUGLEVEL >= 10) {
1279                 if (NT_STATUS_IS_OK(ntlmssp_pull_AUTHENTICATE_MESSAGE(next_request,
1280                                                   ntlmssp_state,
1281                                                   NULL,
1282                                                   &authenticate)))
1283                 {
1284                         NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE, &authenticate);
1285                 }
1286         }
1287
1288         data_blob_free(&encrypted_session_key);
1289
1290         data_blob_free(&ntlmssp_state->chal);
1291
1292         ntlmssp_state->session_key = session_key;
1293
1294         ntlmssp_state->chal = challenge_blob;
1295         ntlmssp_state->lm_resp = lm_response;
1296         ntlmssp_state->nt_resp = nt_response;
1297
1298 done:
1299
1300         ntlmssp_state->expected_state = NTLMSSP_DONE;
1301
1302         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
1303                 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
1304         }
1305
1306         return nt_status;
1307 }
1308
1309 NTSTATUS ntlmssp_client_start(TALLOC_CTX *mem_ctx,
1310                               const char *netbios_name,
1311                               const char *netbios_domain,
1312                               bool use_ntlmv2,
1313                               struct ntlmssp_state **_ntlmssp_state)
1314 {
1315         struct ntlmssp_state *ntlmssp_state;
1316
1317         if (!netbios_name) {
1318                 netbios_name = "";
1319         }
1320
1321         if (!netbios_domain) {
1322                 netbios_domain = "";
1323         }
1324
1325         ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
1326         if (!ntlmssp_state) {
1327                 return NT_STATUS_NO_MEMORY;
1328         }
1329
1330         ntlmssp_state->role = NTLMSSP_CLIENT;
1331
1332         ntlmssp_state->unicode = True;
1333
1334         ntlmssp_state->use_ntlmv2 = use_ntlmv2;
1335
1336         ntlmssp_state->expected_state = NTLMSSP_INITIAL;
1337
1338         ntlmssp_state->neg_flags =
1339                 NTLMSSP_NEGOTIATE_128 |
1340                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
1341                 NTLMSSP_NEGOTIATE_NTLM |
1342                 NTLMSSP_NEGOTIATE_NTLM2 |
1343                 NTLMSSP_NEGOTIATE_KEY_EXCH |
1344                 NTLMSSP_REQUEST_TARGET;
1345
1346         ntlmssp_state->client.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
1347         if (!ntlmssp_state->client.netbios_name) {
1348                 talloc_free(ntlmssp_state);
1349                 return NT_STATUS_NO_MEMORY;
1350         }
1351         ntlmssp_state->client.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
1352         if (!ntlmssp_state->client.netbios_domain) {
1353                 talloc_free(ntlmssp_state);
1354                 return NT_STATUS_NO_MEMORY;
1355         }
1356
1357         *_ntlmssp_state = ntlmssp_state;
1358         return NT_STATUS_OK;
1359 }