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_role == ROLE_STANDALONE) {
 371                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
 372                         return ntlmssp_state->get_global_myname();
 373                 } else {
 374                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
 375                         return ntlmssp_state->get_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         const char *dnsname;
 496         char *dnsdomname = NULL;
 497         uint32 neg_flags = 0;
 498         uint32 ntlmssp_command, chal_flags;
 499         uint8_t cryptkey[8];
 500         const char *target_name;
 501         struct NEGOTIATE_MESSAGE negotiate;
 502         struct CHALLENGE_MESSAGE challenge;
 503         NTSTATUS status;
 504
 505         /* parse the NTLMSSP packet */
 506 #if 0
 507         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 508 #endif
 509
 510         if (request.length) {
 511                 if ((request.length < 16) || !msrpc_parse(ntlmssp_state, &request, "Cdd",
 512                                                           "NTLMSSP",
 513                                                           &ntlmssp_command,
 514                                                           &neg_flags)) {
 515                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
 516                                 (unsigned int)request.length));
 517                         dump_data(2, request.data, request.length);
 518                         return NT_STATUS_INVALID_PARAMETER;
 519                 }
 520                 debug_ntlmssp_flags(neg_flags);
 521
 522                 if (DEBUGLEVEL >= 10) {
 523                         if (NT_STATUS_IS_OK(ntlmssp_pull_NEGOTIATE_MESSAGE(&request,
 524                                                        ntlmssp_state,
 525                                                        NULL,
 526                                                        &negotiate)))
 527                         {
 528                                 NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE, &negotiate);
 529                         }
 530                 }
 531         }
 532
 533         ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, lp_lanman_auth());
 534
 535         /* Ask our caller what challenge they would like in the packet */
 536         status = ntlmssp_state->get_challenge(ntlmssp_state, cryptkey);
 537         if (!NT_STATUS_IS_OK(status)) {
 538                 return status;
 539         }
 540
 541         /* Check if we may set the challenge */
 542         if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
 543                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 544         }
 545
 546         /* The flags we send back are not just the negotiated flags,
 547          * they are also 'what is in this packet'.  Therfore, we
 548          * operate on 'chal_flags' from here on
 549          */
 550
 551         chal_flags = ntlmssp_state->neg_flags;
 552
 553         /* get the right name to fill in as 'target' */
 554         target_name = ntlmssp_target_name(ntlmssp_state,
 555                                           neg_flags, &chal_flags);
 556         if (target_name == NULL)
 557                 return NT_STATUS_INVALID_PARAMETER;
 558
 559         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
 560         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state,
 561                                                         cryptkey, 8);
 562
 563         /* This should be a 'netbios domain -> DNS domain' mapping */
 564         dnsdomname = get_mydnsdomname(ntlmssp_state);
 565         if (!dnsdomname) {
 566                 dnsdomname = talloc_strdup(ntlmssp_state, "");
 567         }
 568         if (!dnsdomname) {
 569                 return NT_STATUS_NO_MEMORY;
 570         }
 571         strlower_m(dnsdomname);
 572
 573         dnsname = get_mydnsfullname();
 574         if (!dnsname) {
 575                 dnsname = "";
 576         }
 577
 578         /* This creates the 'blob' of names that appears at the end of the packet */
 579         if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
 580         {
 581                 msrpc_gen(ntlmssp_state, &struct_blob, "aaaaa",
 582                           MsvAvNbDomainName, target_name,
 583                           MsvAvNbComputerName, ntlmssp_state->get_global_myname(),
 584                           MsvAvDnsDomainName, dnsdomname,
 585                           MsvAvDnsComputerName, dnsname,
 586                           MsvAvEOL, "");
 587         } else {
 588                 struct_blob = data_blob_null;
 589         }
 590
 591         {
 592                 /* Marshel the packet in the right format, be it unicode or ASCII */
 593                 const char *gen_string;
 594                 if (ntlmssp_state->unicode) {
 595                         gen_string = "CdUdbddB";
 596                 } else {
 597                         gen_string = "CdAdbddB";
 598                 }
 599
 600                 msrpc_gen(ntlmssp_state, reply, gen_string,
 601                           "NTLMSSP",
 602                           NTLMSSP_CHALLENGE,
 603                           target_name,
 604                           chal_flags,
 605                           cryptkey, 8,
 606                           0, 0,
 607                           struct_blob.data, struct_blob.length);
 608
 609                 if (DEBUGLEVEL >= 10) {
 610                         if (NT_STATUS_IS_OK(ntlmssp_pull_CHALLENGE_MESSAGE(reply,
 611                                                        ntlmssp_state,
 612                                                        NULL,
 613                                                        &challenge)))
 614                         {
 615                                 NDR_PRINT_DEBUG(CHALLENGE_MESSAGE, &challenge);
 616                         }
 617                 }
 618         }
 619
 620         data_blob_free(&struct_blob);
 621
 622         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 623
 624         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 625 }
 626
 627 /**
 628  * Next state function for the Authenticate packet
 629  *
 630  * @param ntlmssp_state NTLMSSP State
 631  * @param request The request, as a DATA_BLOB
 632  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 633  * @return Errors or NT_STATUS_OK.
 634  */
 635
 636 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
 637                                     const DATA_BLOB request, DATA_BLOB *reply)
 638 {
 639         DATA_BLOB encrypted_session_key = data_blob_null;
 640         DATA_BLOB user_session_key = data_blob_null;
 641         DATA_BLOB lm_session_key = data_blob_null;
 642         DATA_BLOB session_key = data_blob_null;
 643         uint32 ntlmssp_command, auth_flags;
 644         NTSTATUS nt_status = NT_STATUS_OK;
 645         struct AUTHENTICATE_MESSAGE authenticate;
 646
 647         /* used by NTLM2 */
 648         bool doing_ntlm2 = False;
 649
 650         uchar session_nonce[16];
 651         uchar session_nonce_hash[16];
 652
 653         const char *parse_string;
 654
 655         /* parse the NTLMSSP packet */
 656         *reply = data_blob_null;
 657
 658 #if 0
 659         file_save("ntlmssp_auth.dat", request.data, request.length);
 660 #endif
 661
 662         if (ntlmssp_state->unicode) {
 663                 parse_string = "CdBBUUUBd";
 664         } else {
 665                 parse_string = "CdBBAAABd";
 666         }
 667
 668         data_blob_free(&ntlmssp_state->lm_resp);
 669         data_blob_free(&ntlmssp_state->nt_resp);
 670
 671         ntlmssp_state->user = NULL;
 672         ntlmssp_state->domain = NULL;
 673         ntlmssp_state->workstation = NULL;
 674
 675         /* now the NTLMSSP encoded auth hashes */
 676         if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 677                          "NTLMSSP",
 678                          &ntlmssp_command,
 679                          &ntlmssp_state->lm_resp,
 680                          &ntlmssp_state->nt_resp,
 681                          &ntlmssp_state->domain,
 682                          &ntlmssp_state->user,
 683                          &ntlmssp_state->workstation,
 684                          &encrypted_session_key,
 685                          &auth_flags)) {
 686                 auth_flags = 0;
 687
 688                 /* Try again with a shorter string (Win9X truncates this packet) */
 689                 if (ntlmssp_state->unicode) {
 690                         parse_string = "CdBBUUU";
 691                 } else {
 692                         parse_string = "CdBBAAA";
 693                 }
 694
 695                 /* now the NTLMSSP encoded auth hashes */
 696                 if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 697                                  "NTLMSSP",
 698                                  &ntlmssp_command,
 699                                  &ntlmssp_state->lm_resp,
 700                                  &ntlmssp_state->nt_resp,
 701                                  &ntlmssp_state->domain,
 702                                  &ntlmssp_state->user,
 703                                  &ntlmssp_state->workstation)) {
 704                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
 705                         dump_data(2, request.data, request.length);
 706
 707                         return NT_STATUS_INVALID_PARAMETER;
 708                 }
 709         }
 710
 711         if (auth_flags)
 712                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
 713
 714         if (DEBUGLEVEL >= 10) {
 715                 if (NT_STATUS_IS_OK(ntlmssp_pull_AUTHENTICATE_MESSAGE(&request,
 716                                                   ntlmssp_state,
 717                                                   NULL,
 718                                                   &authenticate)))
 719                 {
 720                         NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE, &authenticate);
 721                 }
 722         }
 723
 724         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 725                  ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
 726
 727 #if 0
 728         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 729         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 730 #endif
 731
 732         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 733            client challenge
 734
 735            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 736         */
 737         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 738                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 739                         struct MD5Context md5_session_nonce_ctx;
 740                         SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
 741
 742                         doing_ntlm2 = True;
 743
 744                         memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
 745                         memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 746
 747                         MD5Init(&md5_session_nonce_ctx);
 748                         MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
 749                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 750
 751                         ntlmssp_state->chal = data_blob_talloc(
 752                                 ntlmssp_state, session_nonce_hash, 8);
 753
 754                         /* LM response is no longer useful */
 755                         data_blob_free(&ntlmssp_state->lm_resp);
 756
 757                         /* We changed the effective challenge - set it */
 758                         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
 759                                 data_blob_free(&encrypted_session_key);
 760                                 return nt_status;
 761                         }
 762
 763                         /* LM Key is incompatible. */
 764                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 765                 }
 766         }
 767
 768         /*
 769          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 770          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 771          * smb.conf file) and no NTLMv2 response was sent then the password check
 772          * will fail here. JRA.
 773          */
 774
 775         /* Finally, actually ask if the password is OK */
 776
 777         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
 778                                                                        &user_session_key, &lm_session_key))) {
 779                 data_blob_free(&encrypted_session_key);
 780                 return nt_status;
 781         }
 782
 783         dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
 784         dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
 785
 786         /* Handle the different session key derivation for NTLM2 */
 787         if (doing_ntlm2) {
 788                 if (user_session_key.data && user_session_key.length == 16) {
 789                         session_key = data_blob_talloc(ntlmssp_state,
 790                                                        NULL, 16);
 791                         hmac_md5(user_session_key.data, session_nonce,
 792                                  sizeof(session_nonce), session_key.data);
 793                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 794                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 795
 796                 } else {
 797                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 798                         session_key = data_blob_null;
 799                 }
 800         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
 801                 if (lm_session_key.data && lm_session_key.length >= 8) {
 802                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 803                                 session_key = data_blob_talloc(ntlmssp_state,
 804                                                                NULL, 16);
 805                                 if (session_key.data == NULL) {
 806                                         return NT_STATUS_NO_MEMORY;
 807                                 }
 808                                 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
 809                                                           session_key.data);
 810                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 811                         } else {
 812                                 static const uint8 zeros[24] = {0, };
 813                                 session_key = data_blob_talloc(
 814                                         ntlmssp_state, NULL, 16);
 815                                 if (session_key.data == NULL) {
 816                                         return NT_STATUS_NO_MEMORY;
 817                                 }
 818                                 SMBsesskeygen_lm_sess_key(
 819                                         lm_session_key.data, zeros,
 820                                         session_key.data);
 821                         }
 822                         dump_data_pw("LM session key:\n", session_key.data,
 823                                      session_key.length);
 824                 } else {
 825                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 826                         session_key = data_blob_null;
 827                 }
 828         } else if (user_session_key.data) {
 829                 session_key = user_session_key;
 830                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 831                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 832         } else if (lm_session_key.data) {
 833                 session_key = lm_session_key;
 834                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 835                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 836         } else {
 837                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 838                 session_key = data_blob_null;
 839         }
 840
 841         /* With KEY_EXCH, the client supplies the proposed session key,
 842            but encrypts it with the long-term key */
 843         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 844                 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
 845                         data_blob_free(&encrypted_session_key);
 846                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 847                                   (unsigned int)encrypted_session_key.length));
 848                         return NT_STATUS_INVALID_PARAMETER;
 849                 } else if (!session_key.data || session_key.length != 16) {
 850                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 851                                   (unsigned int)session_key.length));
 852                         ntlmssp_state->session_key = session_key;
 853                 } else {
 854                         dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
 855                         arcfour_crypt_blob(encrypted_session_key.data,
 856                                            encrypted_session_key.length,
 857                                            &session_key);
 858                         ntlmssp_state->session_key = data_blob_talloc(
 859                                 ntlmssp_state, encrypted_session_key.data,
 860                                 encrypted_session_key.length);
 861                         dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
 862                                      encrypted_session_key.length);
 863                 }
 864         } else {
 865                 ntlmssp_state->session_key = session_key;
 866         }
 867
 868         if (!NT_STATUS_IS_OK(nt_status)) {
 869                 ntlmssp_state->session_key = data_blob_null;
 870         } else if (ntlmssp_state->session_key.length) {
 871                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 872         }
 873
 874         data_blob_free(&encrypted_session_key);
 875
 876         /* Only one authentication allowed per server state. */
 877         ntlmssp_state->expected_state = NTLMSSP_DONE;
 878
 879         return nt_status;
 880 }
 881
 882 /**
 883  * Create an NTLMSSP state machine
 884  *
 885  * @param ntlmssp_state NTLMSSP State, allocated by this function
 886  */
 887
 888 NTSTATUS ntlmssp_server_start(struct ntlmssp_state **ntlmssp_state)
 889 {
 890         *ntlmssp_state = TALLOC_ZERO_P(NULL, struct ntlmssp_state);
 891         if (!*ntlmssp_state) {
 892                 DEBUG(0,("ntlmssp_server_start: talloc failed!\n"));
 893                 talloc_destroy(*ntlmssp_state);
 894                 return NT_STATUS_NO_MEMORY;
 895         }
 896
 897         (*ntlmssp_state)->role = NTLMSSP_SERVER;
 898
 899         (*ntlmssp_state)->get_challenge = get_challenge;
 900         (*ntlmssp_state)->set_challenge = set_challenge;
 901         (*ntlmssp_state)->may_set_challenge = may_set_challenge;
 902
 903         (*ntlmssp_state)->get_global_myname = global_myname;
 904         (*ntlmssp_state)->get_domain = lp_workgroup;
 905         (*ntlmssp_state)->server_role = ROLE_DOMAIN_MEMBER; /* a good default */
 906
 907         (*ntlmssp_state)->expected_state = NTLMSSP_NEGOTIATE;
 908
 909         (*ntlmssp_state)->neg_flags =
 910                 NTLMSSP_NEGOTIATE_128 |
 911                 NTLMSSP_NEGOTIATE_56 |
 912                 NTLMSSP_NEGOTIATE_VERSION |
 913                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
 914                 NTLMSSP_NEGOTIATE_NTLM |
 915                 NTLMSSP_NEGOTIATE_NTLM2 |
 916                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 917                 NTLMSSP_NEGOTIATE_SIGN |
 918                 NTLMSSP_NEGOTIATE_SEAL;
 919
 920         return NT_STATUS_OK;
 921 }
 922
 923 /*********************************************************************
 924  Client side NTLMSSP
 925 *********************************************************************/
 926
 927 /**
 928  * Next state function for the Initial packet
 929  *
 930  * @param ntlmssp_state NTLMSSP State
 931  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 932  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 933  * @return Errors or NT_STATUS_OK.
 934  */
 935
 936 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
 937                                   DATA_BLOB reply, DATA_BLOB *next_request)
 938 {
 939         struct NEGOTIATE_MESSAGE negotiate;
 940
 941         if (ntlmssp_state->unicode) {
 942                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 943         } else {
 944                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 945         }
 946
 947         if (ntlmssp_state->use_ntlmv2) {
 948                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 949         }
 950
 951         /* generate the ntlmssp negotiate packet */
 952         msrpc_gen(ntlmssp_state, next_request, "CddAA",
 953                   "NTLMSSP",
 954                   NTLMSSP_NEGOTIATE,
 955                   ntlmssp_state->neg_flags,
 956                   ntlmssp_state->get_domain(),
 957                   ntlmssp_state->get_global_myname());
 958
 959         if (DEBUGLEVEL >= 10) {
 960                 if (NT_STATUS_IS_OK(ntlmssp_pull_NEGOTIATE_MESSAGE(next_request,
 961                                                ntlmssp_state,
 962                                                NULL,
 963                                                &negotiate)))
 964                 {
 965                         NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE, &negotiate);
 966                 }
 967         }
 968
 969         ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
 970
 971         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 972 }
 973
 974 /**
 975  * Next state function for the Challenge Packet.  Generate an auth packet.
 976  *
 977  * @param ntlmssp_state NTLMSSP State
 978  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 979  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 980  * @return Errors or NT_STATUS_OK.
 981  */
 982
 983 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
 984                                          const DATA_BLOB reply, DATA_BLOB *next_request)
 985 {
 986         uint32 chal_flags, ntlmssp_command, unkn1, unkn2;
 987         DATA_BLOB server_domain_blob;
 988         DATA_BLOB challenge_blob;
 989         DATA_BLOB struct_blob = data_blob_null;
 990         char *server_domain;
 991         const char *chal_parse_string;
 992         const char *auth_gen_string;
 993         DATA_BLOB lm_response = data_blob_null;
 994         DATA_BLOB nt_response = data_blob_null;
 995         DATA_BLOB session_key = data_blob_null;
 996         DATA_BLOB encrypted_session_key = data_blob_null;
 997         NTSTATUS nt_status = NT_STATUS_OK;
 998         struct CHALLENGE_MESSAGE challenge;
 999         struct AUTHENTICATE_MESSAGE authenticate;
1000
1001         if (ntlmssp_state->use_ccache) {
1002                 struct wbcCredentialCacheParams params;
1003                 struct wbcCredentialCacheInfo *info = NULL;
1004                 struct wbcAuthErrorInfo *error = NULL;
1005                 struct wbcNamedBlob auth_blob;
1006                 struct wbcBlob *wbc_next = NULL;
1007                 struct wbcBlob *wbc_session_key = NULL;
1008                 wbcErr wbc_status;
1009                 int i;
1010
1011                 params.account_name = ntlmssp_state->user;
1012                 params.domain_name = ntlmssp_state->domain;
1013                 params.level = WBC_CREDENTIAL_CACHE_LEVEL_NTLMSSP;
1014
1015                 auth_blob.name = "challenge_blob";
1016                 auth_blob.flags = 0;
1017                 auth_blob.blob.data = reply.data;
1018                 auth_blob.blob.length = reply.length;
1019                 params.num_blobs = 1;
1020                 params.blobs = &auth_blob;
1021
1022                 wbc_status = wbcCredentialCache(&params, &info, &error);
1023                 if (error != NULL) {
1024                         wbcFreeMemory(error);
1025                 }
1026                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1027                         goto noccache;
1028                 }
1029
1030                 for (i=0; i<info->num_blobs; i++) {
1031                         if (strequal(info->blobs[i].name, "auth_blob")) {
1032                                 wbc_next = &info->blobs[i].blob;
1033                         }
1034                         if (strequal(info->blobs[i].name, "session_key")) {
1035                                 wbc_session_key = &info->blobs[i].blob;
1036                         }
1037                 }
1038                 if ((wbc_next == NULL) || (wbc_session_key == NULL)) {
1039                         wbcFreeMemory(info);
1040                         goto noccache;
1041                 }
1042
1043                 *next_request = data_blob(wbc_next->data, wbc_next->length);
1044                 ntlmssp_state->session_key = data_blob(
1045                         wbc_session_key->data, wbc_session_key->length);
1046
1047                 wbcFreeMemory(info);
1048                 goto done;
1049         }
1050
1051 noccache:
1052
1053         if (!msrpc_parse(ntlmssp_state, &reply, "CdBd",
1054                          "NTLMSSP",
1055                          &ntlmssp_command,
1056                          &server_domain_blob,
1057                          &chal_flags)) {
1058                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
1059                 dump_data(2, reply.data, reply.length);
1060
1061                 return NT_STATUS_INVALID_PARAMETER;
1062         }
1063
1064         if (DEBUGLEVEL >= 10) {
1065                 if (NT_STATUS_IS_OK(ntlmssp_pull_CHALLENGE_MESSAGE(&reply,
1066                                                ntlmssp_state,
1067                                                NULL,
1068                                                &challenge)))
1069                 {
1070                         NDR_PRINT_DEBUG(CHALLENGE_MESSAGE, &challenge);
1071                 }
1072         }
1073
1074         data_blob_free(&server_domain_blob);
1075
1076         DEBUG(3, ("Got challenge flags:\n"));
1077         debug_ntlmssp_flags(chal_flags);
1078
1079         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
1080
1081         if (ntlmssp_state->unicode) {
1082                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
1083                         chal_parse_string = "CdUdbddB";
1084                 } else {
1085                         chal_parse_string = "CdUdbdd";
1086                 }
1087                 auth_gen_string = "CdBBUUUBd";
1088         } else {
1089                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
1090                         chal_parse_string = "CdAdbddB";
1091                 } else {
1092                         chal_parse_string = "CdAdbdd";
1093                 }
1094
1095                 auth_gen_string = "CdBBAAABd";
1096         }
1097
1098         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
1099         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
1100
1101         if (!msrpc_parse(ntlmssp_state, &reply, chal_parse_string,
1102                          "NTLMSSP",
1103                          &ntlmssp_command,
1104                          &server_domain,
1105                          &chal_flags,
1106                          &challenge_blob, 8,
1107                          &unkn1, &unkn2,
1108                          &struct_blob)) {
1109                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
1110                 dump_data(2, reply.data, reply.length);
1111                 return NT_STATUS_INVALID_PARAMETER;
1112         }
1113
1114         ntlmssp_state->server_domain = server_domain;
1115
1116         if (challenge_blob.length != 8) {
1117                 data_blob_free(&struct_blob);
1118                 return NT_STATUS_INVALID_PARAMETER;
1119         }
1120
1121         if (!ntlmssp_state->nt_hash || !ntlmssp_state->lm_hash) {
1122                 static const uint8_t zeros[16] = {0, };
1123                 /* do nothing - blobs are zero length */
1124
1125                 /* session key is all zeros */
1126                 session_key = data_blob_talloc(ntlmssp_state, zeros, 16);
1127
1128                 /* not doing NLTM2 without a password */
1129                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
1130         } else if (ntlmssp_state->use_ntlmv2) {
1131                 if (!struct_blob.length) {
1132                         /* be lazy, match win2k - we can't do NTLMv2 without it */
1133                         DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
1134                         return NT_STATUS_INVALID_PARAMETER;
1135                 }
1136
1137                 /* TODO: if the remote server is standalone, then we should replace 'domain'
1138                    with the server name as supplied above */
1139
1140                 if (!SMBNTLMv2encrypt_hash(ntlmssp_state,
1141                                            ntlmssp_state->user,
1142                                            ntlmssp_state->domain,
1143                                            ntlmssp_state->nt_hash, &challenge_blob,
1144                                            &struct_blob,
1145                                            &lm_response, &nt_response, NULL,
1146                                            &session_key)) {
1147                         data_blob_free(&challenge_blob);
1148                         data_blob_free(&struct_blob);
1149                         return NT_STATUS_NO_MEMORY;
1150                 }
1151         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
1152                 struct MD5Context md5_session_nonce_ctx;
1153                 uchar session_nonce[16];
1154                 uchar session_nonce_hash[16];
1155                 uchar user_session_key[16];
1156
1157                 lm_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1158                 generate_random_buffer(lm_response.data, 8);
1159                 memset(lm_response.data+8, 0, 16);
1160
1161                 memcpy(session_nonce, challenge_blob.data, 8);
1162                 memcpy(&session_nonce[8], lm_response.data, 8);
1163
1164                 MD5Init(&md5_session_nonce_ctx);
1165                 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
1166                 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
1167                 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
1168
1169                 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
1170                 DEBUG(5, ("challenge is: \n"));
1171                 dump_data(5, session_nonce_hash, 8);
1172
1173                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1174                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,
1175                                   session_nonce_hash,
1176                                   nt_response.data);
1177
1178                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
1179
1180                 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, user_session_key);
1181                 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
1182                 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
1183         } else {
1184                 /* lanman auth is insecure, it may be disabled */
1185                 if (lp_client_lanman_auth()) {
1186                         lm_response = data_blob_talloc(ntlmssp_state,
1187                                                        NULL, 24);
1188                         SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
1189                                    lm_response.data);
1190                 }
1191
1192                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1193                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
1194                              nt_response.data);
1195
1196                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
1197                 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
1198                     && lp_client_lanman_auth()) {
1199                         SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
1200                                         session_key.data);
1201                         dump_data_pw("LM session key\n", session_key.data, session_key.length);
1202                 } else {
1203                         SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, session_key.data);
1204                         dump_data_pw("NT session key:\n", session_key.data, session_key.length);
1205                 }
1206         }
1207         data_blob_free(&struct_blob);
1208
1209         /* Key exchange encryptes a new client-generated session key with
1210            the password-derived key */
1211         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
1212                 /* Make up a new session key */
1213                 uint8 client_session_key[16];
1214                 generate_random_buffer(client_session_key, sizeof(client_session_key));
1215
1216                 /* Encrypt the new session key with the old one */
1217                 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
1218                 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
1219                 arcfour_crypt_blob(encrypted_session_key.data, encrypted_session_key.length, &session_key);
1220                 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
1221
1222                 /* Mark the new session key as the 'real' session key */
1223                 data_blob_free(&session_key);
1224                 session_key = data_blob_talloc(ntlmssp_state,
1225                                                client_session_key,
1226                                                sizeof(client_session_key));
1227         }
1228
1229         /* this generates the actual auth packet */
1230         if (!msrpc_gen(ntlmssp_state, next_request, auth_gen_string,
1231                        "NTLMSSP",
1232                        NTLMSSP_AUTH,
1233                        lm_response.data, lm_response.length,
1234                        nt_response.data, nt_response.length,
1235                        ntlmssp_state->domain,
1236                        ntlmssp_state->user,
1237                        ntlmssp_state->get_global_myname(),
1238                        encrypted_session_key.data, encrypted_session_key.length,
1239                        ntlmssp_state->neg_flags)) {
1240
1241                 return NT_STATUS_NO_MEMORY;
1242         }
1243
1244         if (DEBUGLEVEL >= 10) {
1245                 if (NT_STATUS_IS_OK(ntlmssp_pull_AUTHENTICATE_MESSAGE(next_request,
1246                                                   ntlmssp_state,
1247                                                   NULL,
1248                                                   &authenticate)))
1249                 {
1250                         NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE, &authenticate);
1251                 }
1252         }
1253
1254         data_blob_free(&encrypted_session_key);
1255
1256         data_blob_free(&ntlmssp_state->chal);
1257
1258         ntlmssp_state->session_key = session_key;
1259
1260         ntlmssp_state->chal = challenge_blob;
1261         ntlmssp_state->lm_resp = lm_response;
1262         ntlmssp_state->nt_resp = nt_response;
1263
1264 done:
1265
1266         ntlmssp_state->expected_state = NTLMSSP_DONE;
1267
1268         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
1269                 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
1270         }
1271
1272         return nt_status;
1273 }
1274
1275 NTSTATUS ntlmssp_client_start(struct ntlmssp_state **ntlmssp_state)
1276 {
1277         *ntlmssp_state = TALLOC_ZERO_P(NULL, struct ntlmssp_state);
1278         if (!*ntlmssp_state) {
1279                 DEBUG(0,("ntlmssp_client_start: talloc failed!\n"));
1280                 talloc_destroy(*ntlmssp_state);
1281                 return NT_STATUS_NO_MEMORY;
1282         }
1283
1284         (*ntlmssp_state)->role = NTLMSSP_CLIENT;
1285
1286         (*ntlmssp_state)->get_global_myname = global_myname;
1287         (*ntlmssp_state)->get_domain = lp_workgroup;
1288
1289         (*ntlmssp_state)->unicode = True;
1290
1291         (*ntlmssp_state)->use_ntlmv2 = lp_client_ntlmv2_auth();
1292
1293         (*ntlmssp_state)->expected_state = NTLMSSP_INITIAL;
1294
1295         (*ntlmssp_state)->neg_flags =
1296                 NTLMSSP_NEGOTIATE_128 |
1297                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
1298                 NTLMSSP_NEGOTIATE_NTLM |
1299                 NTLMSSP_NEGOTIATE_NTLM2 |
1300                 NTLMSSP_NEGOTIATE_KEY_EXCH |
1301                 NTLMSSP_REQUEST_TARGET;
1302
1303         return NT_STATUS_OK;
1304 }