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 #include "../lib/crypto/md5.h"
  30 #include "../lib/crypto/arcfour.h"
  31 #include "../lib/crypto/hmacmd5.h"
  32
  33 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
  34                                        DATA_BLOB reply, DATA_BLOB *next_request);
  35 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
  36                                          const DATA_BLOB in, DATA_BLOB *out);
  37 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
  38                                          const DATA_BLOB reply, DATA_BLOB *next_request);
  39 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
  40                                     const DATA_BLOB request, DATA_BLOB *reply);
  41
  42 /**
  43  * Callbacks for NTLMSSP - for both client and server operating modes
  44  *
  45  */
  46
  47 static const struct ntlmssp_callbacks {
  48         enum ntlmssp_role role;
  49         enum ntlmssp_message_type ntlmssp_command;
  50         NTSTATUS (*fn)(struct ntlmssp_state *ntlmssp_state,
  51                        DATA_BLOB in, DATA_BLOB *out);
  52 } ntlmssp_callbacks[] = {
  53         {NTLMSSP_CLIENT, NTLMSSP_INITIAL, ntlmssp_client_initial},
  54         {NTLMSSP_SERVER, NTLMSSP_NEGOTIATE, ntlmssp_server_negotiate},
  55         {NTLMSSP_CLIENT, NTLMSSP_CHALLENGE, ntlmssp_client_challenge},
  56         {NTLMSSP_SERVER, NTLMSSP_AUTH, ntlmssp_server_auth},
  57         {NTLMSSP_CLIENT, NTLMSSP_UNKNOWN, NULL},
  58         {NTLMSSP_SERVER, NTLMSSP_UNKNOWN, NULL}
  59 };
  60
  61
  62 /**
  63  * Print out the NTLMSSP flags for debugging
  64  * @param neg_flags The flags from the packet
  65  */
  66
  67 void debug_ntlmssp_flags(uint32_t neg_flags)
  68 {
  69         DEBUG(3,("Got NTLMSSP neg_flags=0x%08x\n", neg_flags));
  70
  71         if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE)
  72                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_UNICODE\n"));
  73         if (neg_flags & NTLMSSP_NEGOTIATE_OEM)
  74                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_OEM\n"));
  75         if (neg_flags & NTLMSSP_REQUEST_TARGET)
  76                 DEBUGADD(4, ("  NTLMSSP_REQUEST_TARGET\n"));
  77         if (neg_flags & NTLMSSP_NEGOTIATE_SIGN)
  78                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_SIGN\n"));
  79         if (neg_flags & NTLMSSP_NEGOTIATE_SEAL)
  80                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_SEAL\n"));
  81         if (neg_flags & NTLMSSP_NEGOTIATE_DATAGRAM)
  82                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_DATAGRAM\n"));
  83         if (neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
  84                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_LM_KEY\n"));
  85         if (neg_flags & NTLMSSP_NEGOTIATE_NETWARE)
  86                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_NETWARE\n"));
  87         if (neg_flags & NTLMSSP_NEGOTIATE_NTLM)
  88                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_NTLM\n"));
  89         if (neg_flags & NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED)
  90                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED\n"));
  91         if (neg_flags & NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED)
  92                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED\n"));
  93         if (neg_flags & NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL)
  94                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL\n"));
  95         if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
  96                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_ALWAYS_SIGN\n"));
  97         if (neg_flags & NTLMSSP_REQUEST_NON_NT_SESSION_KEY)
  98                 DEBUGADD(4, ("  NTLMSSP_REQUEST_NON_NT_SESSION_KEY\n"));
  99         if (neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
 100                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_NTLM2\n"));
 101         if (neg_flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
 102                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_TARGET_INFO\n"));
 103         if (neg_flags & NTLMSSP_NEGOTIATE_VERSION)
 104                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_VERSION\n"));
 105         if (neg_flags & NTLMSSP_NEGOTIATE_128)
 106                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_128\n"));
 107         if (neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)
 108                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_KEY_EXCH\n"));
 109         if (neg_flags & NTLMSSP_NEGOTIATE_56)
 110                 DEBUGADD(4, ("  NTLMSSP_NEGOTIATE_56\n"));
 111 }
 112
 113 /**
 114  * Default challenge generation code.
 115  *
 116  */
 117
 118 static NTSTATUS get_challenge(const struct ntlmssp_state *ntlmssp_state,
 119                               uint8_t chal[8])
 120 {
 121         generate_random_buffer(chal, 8);
 122         return NT_STATUS_OK;
 123 }
 124
 125 /**
 126  * Default 'we can set the challenge to anything we like' implementation
 127  *
 128  */
 129
 130 static bool may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
 131 {
 132         return True;
 133 }
 134
 135 /**
 136  * Default 'we can set the challenge to anything we like' implementation
 137  *
 138  * Does not actually do anything, as the value is always in the structure anyway.
 139  *
 140  */
 141
 142 static NTSTATUS set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
 143 {
 144         SMB_ASSERT(challenge->length == 8);
 145         return NT_STATUS_OK;
 146 }
 147
 148 /**
 149  * Set a username on an NTLMSSP context - ensures it is talloc()ed
 150  *
 151  */
 152
 153 NTSTATUS ntlmssp_set_username(struct ntlmssp_state *ntlmssp_state, const char *user)
 154 {
 155         ntlmssp_state->user = talloc_strdup(ntlmssp_state, user ? user : "" );
 156         if (!ntlmssp_state->user) {
 157                 return NT_STATUS_NO_MEMORY;
 158         }
 159         return NT_STATUS_OK;
 160 }
 161
 162 /**
 163  * Store NT and LM hashes on an NTLMSSP context - ensures they are talloc()ed
 164  *
 165  */
 166 NTSTATUS ntlmssp_set_hashes(struct ntlmssp_state *ntlmssp_state,
 167                             const uint8_t lm_hash[16],
 168                             const uint8_t nt_hash[16])
 169 {
 170         ntlmssp_state->lm_hash = (uint8_t *)
 171                 TALLOC_MEMDUP(ntlmssp_state, lm_hash, 16);
 172         ntlmssp_state->nt_hash = (uint8_t *)
 173                 TALLOC_MEMDUP(ntlmssp_state, nt_hash, 16);
 174         if (!ntlmssp_state->lm_hash || !ntlmssp_state->nt_hash) {
 175                 TALLOC_FREE(ntlmssp_state->lm_hash);
 176                 TALLOC_FREE(ntlmssp_state->nt_hash);
 177                 return NT_STATUS_NO_MEMORY;
 178         }
 179         return NT_STATUS_OK;
 180 }
 181
 182 /**
 183  * Converts a password to the hashes on an NTLMSSP context.
 184  *
 185  */
 186 NTSTATUS ntlmssp_set_password(struct ntlmssp_state *ntlmssp_state, const char *password)
 187 {
 188         if (!password) {
 189                 ntlmssp_state->lm_hash = NULL;
 190                 ntlmssp_state->nt_hash = NULL;
 191         } else {
 192                 uint8_t lm_hash[16];
 193                 uint8_t nt_hash[16];
 194
 195                 E_deshash(password, lm_hash);
 196                 E_md4hash(password, nt_hash);
 197                 return ntlmssp_set_hashes(ntlmssp_state, lm_hash, nt_hash);
 198         }
 199         return NT_STATUS_OK;
 200 }
 201
 202 /**
 203  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
 204  *
 205  */
 206 NTSTATUS ntlmssp_set_domain(struct ntlmssp_state *ntlmssp_state, const char *domain)
 207 {
 208         ntlmssp_state->domain = talloc_strdup(ntlmssp_state,
 209                                               domain ? domain : "" );
 210         if (!ntlmssp_state->domain) {
 211                 return NT_STATUS_NO_MEMORY;
 212         }
 213         return NT_STATUS_OK;
 214 }
 215
 216 /**
 217  * Request features for the NTLMSSP negotiation
 218  *
 219  * @param ntlmssp_state NTLMSSP state
 220  * @param feature_list List of space seperated features requested from NTLMSSP.
 221  */
 222 void ntlmssp_want_feature_list(struct ntlmssp_state *ntlmssp_state, char *feature_list)
 223 {
 224         /*
 225          * We need to set this to allow a later SetPassword
 226          * via the SAMR pipe to succeed. Strange.... We could
 227          * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
 228          */
 229         if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, True)) {
 230                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 231         }
 232         if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, True)) {
 233                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 234         }
 235         if(in_list("NTLMSSP_FEATURE_SEAL", feature_list, True)) {
 236                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 237         }
 238         if (in_list("NTLMSSP_FEATURE_CCACHE", feature_list, true)) {
 239                 ntlmssp_state->use_ccache = true;
 240         }
 241 }
 242
 243 /**
 244  * Request a feature for the NTLMSSP negotiation
 245  *
 246  * @param ntlmssp_state NTLMSSP state
 247  * @param feature Bit flag specifying the requested feature
 248  */
 249 void ntlmssp_want_feature(struct ntlmssp_state *ntlmssp_state, uint32_t feature)
 250 {
 251         /* As per JRA's comment above */
 252         if (feature & NTLMSSP_FEATURE_SESSION_KEY) {
 253                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 254         }
 255         if (feature & NTLMSSP_FEATURE_SIGN) {
 256                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 257         }
 258         if (feature & NTLMSSP_FEATURE_SEAL) {
 259                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 260         }
 261         if (feature & NTLMSSP_FEATURE_CCACHE) {
 262                 ntlmssp_state->use_ccache = true;
 263         }
 264 }
 265
 266 /**
 267  * Next state function for the NTLMSSP state machine
 268  *
 269  * @param ntlmssp_state NTLMSSP State
 270  * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
 271  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 272  * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
 273  */
 274
 275 NTSTATUS ntlmssp_update(struct ntlmssp_state *ntlmssp_state,
 276                         const DATA_BLOB input, DATA_BLOB *out)
 277 {
 278         uint32_t ntlmssp_command;
 279         int i;
 280
 281         if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
 282                 /* Called update after negotiations finished. */
 283                 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
 284                 return NT_STATUS_INVALID_PARAMETER;
 285         }
 286
 287         *out = data_blob_null;
 288
 289         if (!input.length) {
 290                 switch (ntlmssp_state->role) {
 291                 case NTLMSSP_CLIENT:
 292                         ntlmssp_command = NTLMSSP_INITIAL;
 293                         break;
 294                 case NTLMSSP_SERVER:
 295                         /* 'datagram' mode - no neg packet */
 296                         ntlmssp_command = NTLMSSP_NEGOTIATE;
 297                         break;
 298                 }
 299         } else {
 300                 if (!msrpc_parse(ntlmssp_state, &input, "Cd",
 301                                  "NTLMSSP",
 302                                  &ntlmssp_command)) {
 303                         DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
 304                         dump_data(2, input.data, input.length);
 305                         return NT_STATUS_INVALID_PARAMETER;
 306                 }
 307         }
 308
 309         if (ntlmssp_command != ntlmssp_state->expected_state) {
 310                 DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
 311                 return NT_STATUS_INVALID_PARAMETER;
 312         }
 313
 314         for (i=0; ntlmssp_callbacks[i].fn; i++) {
 315                 if (ntlmssp_callbacks[i].role == ntlmssp_state->role
 316                     && ntlmssp_callbacks[i].ntlmssp_command == ntlmssp_command) {
 317                         return ntlmssp_callbacks[i].fn(ntlmssp_state, input, out);
 318                 }
 319         }
 320
 321         DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
 322                   ntlmssp_state->role, ntlmssp_command));
 323
 324         return NT_STATUS_INVALID_PARAMETER;
 325 }
 326
 327 /**
 328  * End an NTLMSSP state machine
 329  *
 330  * @param ntlmssp_state NTLMSSP State, free()ed by this function
 331  */
 332
 333 void ntlmssp_end(struct ntlmssp_state **ntlmssp_state)
 334 {
 335         data_blob_free(&(*ntlmssp_state)->chal);
 336         data_blob_free(&(*ntlmssp_state)->lm_resp);
 337         data_blob_free(&(*ntlmssp_state)->nt_resp);
 338         TALLOC_FREE(*ntlmssp_state);
 339
 340         *ntlmssp_state = NULL;
 341         return;
 342 }
 343
 344 /**
 345  * Determine correct target name flags for reply, given server role
 346  * and negotiated flags
 347  *
 348  * @param ntlmssp_state NTLMSSP State
 349  * @param neg_flags The flags from the packet
 350  * @param chal_flags The flags to be set in the reply packet
 351  * @return The 'target name' string.
 352  */
 353
 354 static const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
 355                                        uint32_t neg_flags, uint32_t *chal_flags)
 356 {
 357         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
 358                 *chal_flags |= NTLMSSP_NEGOTIATE_TARGET_INFO;
 359                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
 360                 if (ntlmssp_state->server.is_standalone) {
 361                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
 362                         return ntlmssp_state->server.netbios_name;
 363                 } else {
 364                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
 365                         return ntlmssp_state->server.netbios_domain;
 366                 };
 367         } else {
 368                 return "";
 369         }
 370 }
 371
 372 static void ntlmssp_handle_neg_flags(struct ntlmssp_state *ntlmssp_state,
 373                                      uint32_t neg_flags, bool allow_lm) {
 374         if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
 375                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 376                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_OEM;
 377                 ntlmssp_state->unicode = True;
 378         } else {
 379                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_UNICODE;
 380                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 381                 ntlmssp_state->unicode = False;
 382         }
 383
 384         if ((neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && allow_lm) {
 385                 /* other end forcing us to use LM */
 386                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
 387                 ntlmssp_state->use_ntlmv2 = False;
 388         } else {
 389                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 390         }
 391
 392         if (!(neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)) {
 393                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 394         }
 395
 396         if (!(neg_flags & NTLMSSP_NEGOTIATE_NTLM2)) {
 397                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 398         }
 399
 400         if (!(neg_flags & NTLMSSP_NEGOTIATE_128)) {
 401                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_128;
 402         }
 403
 404         if (!(neg_flags & NTLMSSP_NEGOTIATE_56)) {
 405                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_56;
 406         }
 407
 408         if (!(neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)) {
 409                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_KEY_EXCH;
 410         }
 411
 412         if (!(neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
 413                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN;
 414         }
 415
 416         if (!(neg_flags & NTLMSSP_NEGOTIATE_SEAL)) {
 417                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SEAL;
 418         }
 419
 420         /* Woop Woop - unknown flag for Windows compatibility...
 421            What does this really do ? JRA. */
 422         if (!(neg_flags & NTLMSSP_NEGOTIATE_VERSION)) {
 423                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_VERSION;
 424         }
 425
 426         if ((neg_flags & NTLMSSP_REQUEST_TARGET)) {
 427                 ntlmssp_state->neg_flags |= NTLMSSP_REQUEST_TARGET;
 428         }
 429 }
 430
 431 /**
 432  * Next state function for the Negotiate packet
 433  *
 434  * @param ntlmssp_state NTLMSSP State
 435  * @param request The request, as a DATA_BLOB
 436  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 437  * @return Errors or MORE_PROCESSING_REQUIRED if a reply is sent.
 438  */
 439
 440 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
 441                                          const DATA_BLOB request, DATA_BLOB *reply)
 442 {
 443         DATA_BLOB struct_blob;
 444         uint32_t neg_flags = 0;
 445         uint32_t ntlmssp_command, chal_flags;
 446         uint8_t cryptkey[8];
 447         const char *target_name;
 448         struct NEGOTIATE_MESSAGE negotiate;
 449         struct CHALLENGE_MESSAGE challenge;
 450         NTSTATUS status;
 451
 452         /* parse the NTLMSSP packet */
 453 #if 0
 454         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 455 #endif
 456
 457         if (request.length) {
 458                 if ((request.length < 16) || !msrpc_parse(ntlmssp_state, &request, "Cdd",
 459                                                           "NTLMSSP",
 460                                                           &ntlmssp_command,
 461                                                           &neg_flags)) {
 462                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
 463                                 (unsigned int)request.length));
 464                         dump_data(2, request.data, request.length);
 465                         return NT_STATUS_INVALID_PARAMETER;
 466                 }
 467                 debug_ntlmssp_flags(neg_flags);
 468
 469                 if (DEBUGLEVEL >= 10) {
 470                         if (NT_STATUS_IS_OK(ntlmssp_pull_NEGOTIATE_MESSAGE(&request,
 471                                                        ntlmssp_state,
 472                                                        &negotiate)))
 473                         {
 474                                 NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE, &negotiate);
 475                         }
 476                 }
 477         }
 478
 479         ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, lp_lanman_auth());
 480
 481         /* Ask our caller what challenge they would like in the packet */
 482         status = ntlmssp_state->get_challenge(ntlmssp_state, cryptkey);
 483         if (!NT_STATUS_IS_OK(status)) {
 484                 return status;
 485         }
 486
 487         /* Check if we may set the challenge */
 488         if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
 489                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 490         }
 491
 492         /* The flags we send back are not just the negotiated flags,
 493          * they are also 'what is in this packet'.  Therfore, we
 494          * operate on 'chal_flags' from here on
 495          */
 496
 497         chal_flags = ntlmssp_state->neg_flags;
 498
 499         /* get the right name to fill in as 'target' */
 500         target_name = ntlmssp_target_name(ntlmssp_state,
 501                                           neg_flags, &chal_flags);
 502         if (target_name == NULL)
 503                 return NT_STATUS_INVALID_PARAMETER;
 504
 505         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
 506         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state,
 507                                                         cryptkey, 8);
 508
 509         /* This creates the 'blob' of names that appears at the end of the packet */
 510         if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
 511         {
 512                 msrpc_gen(ntlmssp_state, &struct_blob, "aaaaa",
 513                           MsvAvNbDomainName, target_name,
 514                           MsvAvNbComputerName, ntlmssp_state->server.netbios_name,
 515                           MsvAvDnsDomainName, ntlmssp_state->server.dns_domain,
 516                           MsvAvDnsComputerName, ntlmssp_state->server.dns_name,
 517                           MsvAvEOL, "");
 518         } else {
 519                 struct_blob = data_blob_null;
 520         }
 521
 522         {
 523                 /* Marshal the packet in the right format, be it unicode or ASCII */
 524                 const char *gen_string;
 525                 /* "What Windows returns" as a version number. */
 526                 const char vers[] = { 0x6, 0x1, 0xb0, 0x1d, 0, 0, 0, 0xf};
 527
 528                 if (chal_flags & NTLMSSP_NEGOTIATE_VERSION) {
 529                         DATA_BLOB version_blob = data_blob_talloc(ntlmssp_state, vers, 8);
 530
 531                         if (ntlmssp_state->unicode) {
 532                                 gen_string = "CdUdbddBb";
 533                         } else {
 534                                 gen_string = "CdAdbddBb";
 535                         }
 536
 537                         msrpc_gen(ntlmssp_state, reply, gen_string,
 538                                 "NTLMSSP",
 539                                 NTLMSSP_CHALLENGE,
 540                                 target_name,
 541                                 chal_flags,
 542                                 cryptkey, 8,
 543                                 0, 0,
 544                                 struct_blob.data, struct_blob.length,
 545                                 version_blob.data, version_blob.length);
 546                         data_blob_free(&version_blob);
 547                 } else {
 548                         if (ntlmssp_state->unicode) {
 549                                 gen_string = "CdUdbddB";
 550                         } else {
 551                                 gen_string = "CdAdbddB";
 552                         }
 553
 554                         msrpc_gen(ntlmssp_state, reply, gen_string,
 555                                 "NTLMSSP",
 556                                 NTLMSSP_CHALLENGE,
 557                                 target_name,
 558                                 chal_flags,
 559                                 cryptkey, 8,
 560                                 0, 0,
 561                                 struct_blob.data, struct_blob.length);
 562                 }
 563
 564                 if (DEBUGLEVEL >= 10) {
 565                         if (NT_STATUS_IS_OK(ntlmssp_pull_CHALLENGE_MESSAGE(reply,
 566                                                        ntlmssp_state,
 567                                                        &challenge)))
 568                         {
 569                                 NDR_PRINT_DEBUG(CHALLENGE_MESSAGE, &challenge);
 570                         }
 571                 }
 572         }
 573
 574         data_blob_free(&struct_blob);
 575
 576         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 577
 578         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 579 }
 580
 581 /**
 582  * Next state function for the Authenticate packet
 583  *
 584  * @param ntlmssp_state NTLMSSP State
 585  * @param request The request, as a DATA_BLOB
 586  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 587  * @return Errors or NT_STATUS_OK.
 588  */
 589
 590 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
 591                                     const DATA_BLOB request, DATA_BLOB *reply)
 592 {
 593         DATA_BLOB encrypted_session_key = data_blob_null;
 594         DATA_BLOB user_session_key = data_blob_null;
 595         DATA_BLOB lm_session_key = data_blob_null;
 596         DATA_BLOB session_key = data_blob_null;
 597         uint32_t ntlmssp_command, auth_flags;
 598         NTSTATUS nt_status = NT_STATUS_OK;
 599         struct AUTHENTICATE_MESSAGE authenticate;
 600
 601         /* used by NTLM2 */
 602         bool doing_ntlm2 = False;
 603
 604         uint8_t session_nonce[16];
 605         uint8_t session_nonce_hash[16];
 606
 607         const char *parse_string;
 608
 609         /* parse the NTLMSSP packet */
 610         *reply = data_blob_null;
 611
 612 #if 0
 613         file_save("ntlmssp_auth.dat", request.data, request.length);
 614 #endif
 615
 616         if (ntlmssp_state->unicode) {
 617                 parse_string = "CdBBUUUBd";
 618         } else {
 619                 parse_string = "CdBBAAABd";
 620         }
 621
 622         data_blob_free(&ntlmssp_state->lm_resp);
 623         data_blob_free(&ntlmssp_state->nt_resp);
 624
 625         ntlmssp_state->user = NULL;
 626         ntlmssp_state->domain = NULL;
 627
 628         /* now the NTLMSSP encoded auth hashes */
 629         if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 630                          "NTLMSSP",
 631                          &ntlmssp_command,
 632                          &ntlmssp_state->lm_resp,
 633                          &ntlmssp_state->nt_resp,
 634                          &ntlmssp_state->domain,
 635                          &ntlmssp_state->user,
 636                          &ntlmssp_state->client.netbios_name,
 637                          &encrypted_session_key,
 638                          &auth_flags)) {
 639                 auth_flags = 0;
 640
 641                 /* Try again with a shorter string (Win9X truncates this packet) */
 642                 if (ntlmssp_state->unicode) {
 643                         parse_string = "CdBBUUU";
 644                 } else {
 645                         parse_string = "CdBBAAA";
 646                 }
 647
 648                 /* now the NTLMSSP encoded auth hashes */
 649                 if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 650                                  "NTLMSSP",
 651                                  &ntlmssp_command,
 652                                  &ntlmssp_state->lm_resp,
 653                                  &ntlmssp_state->nt_resp,
 654                                  &ntlmssp_state->domain,
 655                                  &ntlmssp_state->user,
 656                                  &ntlmssp_state->client.netbios_name)) {
 657                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
 658                         dump_data(2, request.data, request.length);
 659
 660                         return NT_STATUS_INVALID_PARAMETER;
 661                 }
 662         }
 663
 664         if (auth_flags)
 665                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
 666
 667         if (DEBUGLEVEL >= 10) {
 668                 if (NT_STATUS_IS_OK(ntlmssp_pull_AUTHENTICATE_MESSAGE(&request,
 669                                                   ntlmssp_state,
 670                                                   &authenticate)))
 671                 {
 672                         NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE, &authenticate);
 673                 }
 674         }
 675
 676         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 677                  ntlmssp_state->user, ntlmssp_state->domain,
 678                  ntlmssp_state->client.netbios_name,
 679                  (unsigned long)ntlmssp_state->lm_resp.length,
 680                  (unsigned long)ntlmssp_state->nt_resp.length));
 681
 682 #if 0
 683         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 684         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 685 #endif
 686
 687         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 688            client challenge
 689
 690            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 691         */
 692         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 693                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 694                         struct MD5Context md5_session_nonce_ctx;
 695                         SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
 696
 697                         doing_ntlm2 = True;
 698
 699                         memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
 700                         memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 701
 702                         MD5Init(&md5_session_nonce_ctx);
 703                         MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
 704                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 705
 706                         ntlmssp_state->chal = data_blob_talloc(
 707                                 ntlmssp_state, session_nonce_hash, 8);
 708
 709                         /* LM response is no longer useful */
 710                         data_blob_free(&ntlmssp_state->lm_resp);
 711
 712                         /* We changed the effective challenge - set it */
 713                         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
 714                                 data_blob_free(&encrypted_session_key);
 715                                 return nt_status;
 716                         }
 717
 718                         /* LM Key is incompatible. */
 719                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 720                 }
 721         }
 722
 723         /*
 724          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 725          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 726          * smb.conf file) and no NTLMv2 response was sent then the password check
 727          * will fail here. JRA.
 728          */
 729
 730         /* Finally, actually ask if the password is OK */
 731
 732         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
 733                                                                        &user_session_key, &lm_session_key))) {
 734                 data_blob_free(&encrypted_session_key);
 735                 return nt_status;
 736         }
 737
 738         dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
 739         dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
 740
 741         /* Handle the different session key derivation for NTLM2 */
 742         if (doing_ntlm2) {
 743                 if (user_session_key.data && user_session_key.length == 16) {
 744                         session_key = data_blob_talloc(ntlmssp_state,
 745                                                        NULL, 16);
 746                         hmac_md5(user_session_key.data, session_nonce,
 747                                  sizeof(session_nonce), session_key.data);
 748                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 749                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 750
 751                 } else {
 752                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 753                         session_key = data_blob_null;
 754                 }
 755         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
 756                 if (lm_session_key.data && lm_session_key.length >= 8) {
 757                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 758                                 session_key = data_blob_talloc(ntlmssp_state,
 759                                                                NULL, 16);
 760                                 if (session_key.data == NULL) {
 761                                         return NT_STATUS_NO_MEMORY;
 762                                 }
 763                                 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
 764                                                           session_key.data);
 765                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 766                         } else {
 767                                 static const uint8_t zeros[24] = {0, };
 768                                 session_key = data_blob_talloc(
 769                                         ntlmssp_state, NULL, 16);
 770                                 if (session_key.data == NULL) {
 771                                         return NT_STATUS_NO_MEMORY;
 772                                 }
 773                                 SMBsesskeygen_lm_sess_key(
 774                                         lm_session_key.data, zeros,
 775                                         session_key.data);
 776                         }
 777                         dump_data_pw("LM session key:\n", session_key.data,
 778                                      session_key.length);
 779                 } else {
 780                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 781                         session_key = data_blob_null;
 782                 }
 783         } else if (user_session_key.data) {
 784                 session_key = user_session_key;
 785                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 786                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 787         } else if (lm_session_key.data) {
 788                 session_key = lm_session_key;
 789                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 790                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 791         } else {
 792                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 793                 session_key = data_blob_null;
 794         }
 795
 796         /* With KEY_EXCH, the client supplies the proposed session key,
 797            but encrypts it with the long-term key */
 798         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 799                 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
 800                         data_blob_free(&encrypted_session_key);
 801                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 802                                   (unsigned int)encrypted_session_key.length));
 803                         return NT_STATUS_INVALID_PARAMETER;
 804                 } else if (!session_key.data || session_key.length != 16) {
 805                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 806                                   (unsigned int)session_key.length));
 807                         ntlmssp_state->session_key = session_key;
 808                 } else {
 809                         dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
 810                         arcfour_crypt_blob(encrypted_session_key.data,
 811                                            encrypted_session_key.length,
 812                                            &session_key);
 813                         ntlmssp_state->session_key = data_blob_talloc(
 814                                 ntlmssp_state, encrypted_session_key.data,
 815                                 encrypted_session_key.length);
 816                         dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
 817                                      encrypted_session_key.length);
 818                 }
 819         } else {
 820                 ntlmssp_state->session_key = session_key;
 821         }
 822
 823         if (!NT_STATUS_IS_OK(nt_status)) {
 824                 ntlmssp_state->session_key = data_blob_null;
 825         } else if (ntlmssp_state->session_key.length) {
 826                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 827         }
 828
 829         data_blob_free(&encrypted_session_key);
 830
 831         /* Only one authentication allowed per server state. */
 832         ntlmssp_state->expected_state = NTLMSSP_DONE;
 833
 834         return nt_status;
 835 }
 836
 837 /**
 838  * Create an NTLMSSP state machine
 839  *
 840  * @param ntlmssp_state NTLMSSP State, allocated by this function
 841  */
 842
 843 NTSTATUS ntlmssp_server_start(TALLOC_CTX *mem_ctx,
 844                               bool is_standalone,
 845                               const char *netbios_name,
 846                               const char *netbios_domain,
 847                               const char *dns_name,
 848                               const char *dns_domain,
 849                               struct ntlmssp_state **_ntlmssp_state)
 850 {
 851         struct ntlmssp_state *ntlmssp_state;
 852
 853         if (!netbios_name) {
 854                 netbios_name = "";
 855         }
 856
 857         if (!netbios_domain) {
 858                 netbios_domain = "";
 859         }
 860
 861         if (!dns_domain) {
 862                 dns_domain = "";
 863         }
 864
 865         if (!dns_name) {
 866                 dns_name = "";
 867         }
 868
 869         ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
 870         if (!ntlmssp_state) {
 871                 return NT_STATUS_NO_MEMORY;
 872         }
 873
 874         ntlmssp_state->role = NTLMSSP_SERVER;
 875
 876         ntlmssp_state->get_challenge = get_challenge;
 877         ntlmssp_state->set_challenge = set_challenge;
 878         ntlmssp_state->may_set_challenge = may_set_challenge;
 879
 880         ntlmssp_state->server.is_standalone = is_standalone;
 881
 882         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 883
 884         ntlmssp_state->neg_flags =
 885                 NTLMSSP_NEGOTIATE_128 |
 886                 NTLMSSP_NEGOTIATE_56 |
 887                 NTLMSSP_NEGOTIATE_VERSION |
 888                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
 889                 NTLMSSP_NEGOTIATE_NTLM |
 890                 NTLMSSP_NEGOTIATE_NTLM2 |
 891                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 892                 NTLMSSP_NEGOTIATE_SIGN |
 893                 NTLMSSP_NEGOTIATE_SEAL;
 894
 895         ntlmssp_state->server.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
 896         if (!ntlmssp_state->server.netbios_name) {
 897                 talloc_free(ntlmssp_state);
 898                 return NT_STATUS_NO_MEMORY;
 899         }
 900         ntlmssp_state->server.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
 901         if (!ntlmssp_state->server.netbios_domain) {
 902                 talloc_free(ntlmssp_state);
 903                 return NT_STATUS_NO_MEMORY;
 904         }
 905         ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state, dns_name);
 906         if (!ntlmssp_state->server.dns_name) {
 907                 talloc_free(ntlmssp_state);
 908                 return NT_STATUS_NO_MEMORY;
 909         }
 910         ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state, dns_domain);
 911         if (!ntlmssp_state->server.dns_domain) {
 912                 talloc_free(ntlmssp_state);
 913                 return NT_STATUS_NO_MEMORY;
 914         }
 915
 916         *_ntlmssp_state = ntlmssp_state;
 917         return NT_STATUS_OK;
 918 }
 919
 920 /*********************************************************************
 921  Client side NTLMSSP
 922 *********************************************************************/
 923
 924 /**
 925  * Next state function for the Initial packet
 926  *
 927  * @param ntlmssp_state NTLMSSP State
 928  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 929  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 930  * @return Errors or NT_STATUS_OK.
 931  */
 932
 933 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
 934                                   DATA_BLOB reply, DATA_BLOB *next_request)
 935 {
 936         struct NEGOTIATE_MESSAGE negotiate;
 937
 938         if (ntlmssp_state->unicode) {
 939                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 940         } else {
 941                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 942         }
 943
 944         if (ntlmssp_state->use_ntlmv2) {
 945                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 946         }
 947
 948         /* generate the ntlmssp negotiate packet */
 949         msrpc_gen(ntlmssp_state, next_request, "CddAA",
 950                   "NTLMSSP",
 951                   NTLMSSP_NEGOTIATE,
 952                   ntlmssp_state->neg_flags,
 953                   ntlmssp_state->client.netbios_domain,
 954                   ntlmssp_state->client.netbios_name);
 955
 956         if (DEBUGLEVEL >= 10) {
 957                 if (NT_STATUS_IS_OK(ntlmssp_pull_NEGOTIATE_MESSAGE(next_request,
 958                                                ntlmssp_state,
 959                                                &negotiate)))
 960                 {
 961                         NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE, &negotiate);
 962                 }
 963         }
 964
 965         ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
 966
 967         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 968 }
 969
 970 /**
 971  * Next state function for the Challenge Packet.  Generate an auth packet.
 972  *
 973  * @param ntlmssp_state NTLMSSP State
 974  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 975  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 976  * @return Errors or NT_STATUS_OK.
 977  */
 978
 979 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
 980                                          const DATA_BLOB reply, DATA_BLOB *next_request)
 981 {
 982         uint32_t chal_flags, ntlmssp_command, unkn1, unkn2;
 983         DATA_BLOB server_domain_blob;
 984         DATA_BLOB challenge_blob;
 985         DATA_BLOB struct_blob = data_blob_null;
 986         char *server_domain;
 987         const char *chal_parse_string;
 988         const char *auth_gen_string;
 989         DATA_BLOB lm_response = data_blob_null;
 990         DATA_BLOB nt_response = data_blob_null;
 991         DATA_BLOB session_key = data_blob_null;
 992         DATA_BLOB encrypted_session_key = data_blob_null;
 993         NTSTATUS nt_status = NT_STATUS_OK;
 994         struct CHALLENGE_MESSAGE challenge;
 995         struct AUTHENTICATE_MESSAGE authenticate;
 996
 997         if (ntlmssp_state->use_ccache) {
 998                 struct wbcCredentialCacheParams params;
 999                 struct wbcCredentialCacheInfo *info = NULL;
1000                 struct wbcAuthErrorInfo *error = NULL;
1001                 struct wbcNamedBlob auth_blob;
1002                 struct wbcBlob *wbc_next = NULL;
1003                 struct wbcBlob *wbc_session_key = NULL;
1004                 wbcErr wbc_status;
1005                 int i;
1006
1007                 params.account_name = ntlmssp_state->user;
1008                 params.domain_name = ntlmssp_state->domain;
1009                 params.level = WBC_CREDENTIAL_CACHE_LEVEL_NTLMSSP;
1010
1011                 auth_blob.name = "challenge_blob";
1012                 auth_blob.flags = 0;
1013                 auth_blob.blob.data = reply.data;
1014                 auth_blob.blob.length = reply.length;
1015                 params.num_blobs = 1;
1016                 params.blobs = &auth_blob;
1017
1018                 wbc_status = wbcCredentialCache(&params, &info, &error);
1019                 if (error != NULL) {
1020                         wbcFreeMemory(error);
1021                 }
1022                 if (!WBC_ERROR_IS_OK(wbc_status)) {
1023                         goto noccache;
1024                 }
1025
1026                 for (i=0; i<info->num_blobs; i++) {
1027                         if (strequal(info->blobs[i].name, "auth_blob")) {
1028                                 wbc_next = &info->blobs[i].blob;
1029                         }
1030                         if (strequal(info->blobs[i].name, "session_key")) {
1031                                 wbc_session_key = &info->blobs[i].blob;
1032                         }
1033                 }
1034                 if ((wbc_next == NULL) || (wbc_session_key == NULL)) {
1035                         wbcFreeMemory(info);
1036                         goto noccache;
1037                 }
1038
1039                 *next_request = data_blob(wbc_next->data, wbc_next->length);
1040                 ntlmssp_state->session_key = data_blob(
1041                         wbc_session_key->data, wbc_session_key->length);
1042
1043                 wbcFreeMemory(info);
1044                 goto done;
1045         }
1046
1047 noccache:
1048
1049         if (!msrpc_parse(ntlmssp_state, &reply, "CdBd",
1050                          "NTLMSSP",
1051                          &ntlmssp_command,
1052                          &server_domain_blob,
1053                          &chal_flags)) {
1054                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
1055                 dump_data(2, reply.data, reply.length);
1056
1057                 return NT_STATUS_INVALID_PARAMETER;
1058         }
1059
1060         if (DEBUGLEVEL >= 10) {
1061                 if (NT_STATUS_IS_OK(ntlmssp_pull_CHALLENGE_MESSAGE(&reply,
1062                                                ntlmssp_state,
1063                                                &challenge)))
1064                 {
1065                         NDR_PRINT_DEBUG(CHALLENGE_MESSAGE, &challenge);
1066                 }
1067         }
1068
1069         data_blob_free(&server_domain_blob);
1070
1071         DEBUG(3, ("Got challenge flags:\n"));
1072         debug_ntlmssp_flags(chal_flags);
1073
1074         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
1075
1076         if (ntlmssp_state->unicode) {
1077                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
1078                         chal_parse_string = "CdUdbddB";
1079                 } else {
1080                         chal_parse_string = "CdUdbdd";
1081                 }
1082                 auth_gen_string = "CdBBUUUBd";
1083         } else {
1084                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
1085                         chal_parse_string = "CdAdbddB";
1086                 } else {
1087                         chal_parse_string = "CdAdbdd";
1088                 }
1089
1090                 auth_gen_string = "CdBBAAABd";
1091         }
1092
1093         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
1094         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
1095
1096         if (!msrpc_parse(ntlmssp_state, &reply, chal_parse_string,
1097                          "NTLMSSP",
1098                          &ntlmssp_command,
1099                          &server_domain,
1100                          &chal_flags,
1101                          &challenge_blob, 8,
1102                          &unkn1, &unkn2,
1103                          &struct_blob)) {
1104                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
1105                 dump_data(2, reply.data, reply.length);
1106                 return NT_STATUS_INVALID_PARAMETER;
1107         }
1108
1109         if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
1110                 ntlmssp_state->server.is_standalone = true;
1111         } else {
1112                 ntlmssp_state->server.is_standalone = false;
1113         }
1114         /* TODO: parse struct_blob and fill in the rest */
1115         ntlmssp_state->server.netbios_name = "";
1116         ntlmssp_state->server.netbios_domain = server_domain;
1117         ntlmssp_state->server.dns_name = "";
1118         ntlmssp_state->server.dns_domain = "";
1119
1120         if (challenge_blob.length != 8) {
1121                 data_blob_free(&struct_blob);
1122                 return NT_STATUS_INVALID_PARAMETER;
1123         }
1124
1125         if (!ntlmssp_state->nt_hash || !ntlmssp_state->lm_hash) {
1126                 static const uint8_t zeros[16] = {0, };
1127                 /* do nothing - blobs are zero length */
1128
1129                 /* session key is all zeros */
1130                 session_key = data_blob_talloc(ntlmssp_state, zeros, 16);
1131
1132                 /* not doing NLTM2 without a password */
1133                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
1134         } else if (ntlmssp_state->use_ntlmv2) {
1135                 if (!struct_blob.length) {
1136                         /* be lazy, match win2k - we can't do NTLMv2 without it */
1137                         DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
1138                         return NT_STATUS_INVALID_PARAMETER;
1139                 }
1140
1141                 /* TODO: if the remote server is standalone, then we should replace 'domain'
1142                    with the server name as supplied above */
1143
1144                 if (!SMBNTLMv2encrypt_hash(ntlmssp_state,
1145                                            ntlmssp_state->user,
1146                                            ntlmssp_state->domain,
1147                                            ntlmssp_state->nt_hash, &challenge_blob,
1148                                            &struct_blob,
1149                                            &lm_response, &nt_response, NULL,
1150                                            &session_key)) {
1151                         data_blob_free(&challenge_blob);
1152                         data_blob_free(&struct_blob);
1153                         return NT_STATUS_NO_MEMORY;
1154                 }
1155         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
1156                 struct MD5Context md5_session_nonce_ctx;
1157                 uint8_t session_nonce[16];
1158                 uint8_t session_nonce_hash[16];
1159                 uint8_t user_session_key[16];
1160
1161                 lm_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1162                 generate_random_buffer(lm_response.data, 8);
1163                 memset(lm_response.data+8, 0, 16);
1164
1165                 memcpy(session_nonce, challenge_blob.data, 8);
1166                 memcpy(&session_nonce[8], lm_response.data, 8);
1167
1168                 MD5Init(&md5_session_nonce_ctx);
1169                 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
1170                 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
1171                 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
1172
1173                 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
1174                 DEBUG(5, ("challenge is: \n"));
1175                 dump_data(5, session_nonce_hash, 8);
1176
1177                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1178                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,
1179                                   session_nonce_hash,
1180                                   nt_response.data);
1181
1182                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
1183
1184                 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, user_session_key);
1185                 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
1186                 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
1187         } else {
1188                 /* lanman auth is insecure, it may be disabled */
1189                 if (lp_client_lanman_auth()) {
1190                         lm_response = data_blob_talloc(ntlmssp_state,
1191                                                        NULL, 24);
1192                         SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
1193                                    lm_response.data);
1194                 }
1195
1196                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1197                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
1198                              nt_response.data);
1199
1200                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
1201                 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
1202                     && lp_client_lanman_auth()) {
1203                         SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
1204                                         session_key.data);
1205                         dump_data_pw("LM session key\n", session_key.data, session_key.length);
1206                 } else {
1207                         SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, session_key.data);
1208                         dump_data_pw("NT session key:\n", session_key.data, session_key.length);
1209                 }
1210         }
1211         data_blob_free(&struct_blob);
1212
1213         /* Key exchange encryptes a new client-generated session key with
1214            the password-derived key */
1215         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
1216                 /* Make up a new session key */
1217                 uint8_t client_session_key[16];
1218                 generate_random_buffer(client_session_key, sizeof(client_session_key));
1219
1220                 /* Encrypt the new session key with the old one */
1221                 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
1222                 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
1223                 arcfour_crypt_blob(encrypted_session_key.data, encrypted_session_key.length, &session_key);
1224                 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
1225
1226                 /* Mark the new session key as the 'real' session key */
1227                 data_blob_free(&session_key);
1228                 session_key = data_blob_talloc(ntlmssp_state,
1229                                                client_session_key,
1230                                                sizeof(client_session_key));
1231         }
1232
1233         /* this generates the actual auth packet */
1234         if (!msrpc_gen(ntlmssp_state, next_request, auth_gen_string,
1235                        "NTLMSSP",
1236                        NTLMSSP_AUTH,
1237                        lm_response.data, lm_response.length,
1238                        nt_response.data, nt_response.length,
1239                        ntlmssp_state->domain,
1240                        ntlmssp_state->user,
1241                        ntlmssp_state->client.netbios_name,
1242                        encrypted_session_key.data, encrypted_session_key.length,
1243                        ntlmssp_state->neg_flags)) {
1244
1245                 return NT_STATUS_NO_MEMORY;
1246         }
1247
1248         if (DEBUGLEVEL >= 10) {
1249                 if (NT_STATUS_IS_OK(ntlmssp_pull_AUTHENTICATE_MESSAGE(next_request,
1250                                                   ntlmssp_state,
1251                                                   &authenticate)))
1252                 {
1253                         NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE, &authenticate);
1254                 }
1255         }
1256
1257         data_blob_free(&encrypted_session_key);
1258
1259         data_blob_free(&ntlmssp_state->chal);
1260
1261         ntlmssp_state->session_key = session_key;
1262
1263         ntlmssp_state->chal = challenge_blob;
1264         ntlmssp_state->lm_resp = lm_response;
1265         ntlmssp_state->nt_resp = nt_response;
1266
1267 done:
1268
1269         ntlmssp_state->expected_state = NTLMSSP_DONE;
1270
1271         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
1272                 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
1273         }
1274
1275         return nt_status;
1276 }
1277
1278 NTSTATUS ntlmssp_client_start(TALLOC_CTX *mem_ctx,
1279                               const char *netbios_name,
1280                               const char *netbios_domain,
1281                               bool use_ntlmv2,
1282                               struct ntlmssp_state **_ntlmssp_state)
1283 {
1284         struct ntlmssp_state *ntlmssp_state;
1285
1286         if (!netbios_name) {
1287                 netbios_name = "";
1288         }
1289
1290         if (!netbios_domain) {
1291                 netbios_domain = "";
1292         }
1293
1294         ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
1295         if (!ntlmssp_state) {
1296                 return NT_STATUS_NO_MEMORY;
1297         }
1298
1299         ntlmssp_state->role = NTLMSSP_CLIENT;
1300
1301         ntlmssp_state->unicode = True;
1302
1303         ntlmssp_state->use_ntlmv2 = use_ntlmv2;
1304
1305         ntlmssp_state->expected_state = NTLMSSP_INITIAL;
1306
1307         ntlmssp_state->neg_flags =
1308                 NTLMSSP_NEGOTIATE_128 |
1309                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
1310                 NTLMSSP_NEGOTIATE_NTLM |
1311                 NTLMSSP_NEGOTIATE_NTLM2 |
1312                 NTLMSSP_NEGOTIATE_KEY_EXCH |
1313                 NTLMSSP_REQUEST_TARGET;
1314
1315         ntlmssp_state->client.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
1316         if (!ntlmssp_state->client.netbios_name) {
1317                 talloc_free(ntlmssp_state);
1318                 return NT_STATUS_NO_MEMORY;
1319         }
1320         ntlmssp_state->client.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
1321         if (!ntlmssp_state->client.netbios_domain) {
1322                 talloc_free(ntlmssp_state);
1323                 return NT_STATUS_NO_MEMORY;
1324         }
1325
1326         *_ntlmssp_state = ntlmssp_state;
1327         return NT_STATUS_OK;
1328 }