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                 /* Marshel the packet in the right format, be it unicode or ASCII */
 524                 const char *gen_string;
 525                 if (ntlmssp_state->unicode) {
 526                         gen_string = "CdUdbddB";
 527                 } else {
 528                         gen_string = "CdAdbddB";
 529                 }
 530
 531                 msrpc_gen(ntlmssp_state, reply, gen_string,
 532                           "NTLMSSP",
 533                           NTLMSSP_CHALLENGE,
 534                           target_name,
 535                           chal_flags,
 536                           cryptkey, 8,
 537                           0, 0,
 538                           struct_blob.data, struct_blob.length);
 539
 540                 if (DEBUGLEVEL >= 10) {
 541                         if (NT_STATUS_IS_OK(ntlmssp_pull_CHALLENGE_MESSAGE(reply,
 542                                                        ntlmssp_state,
 543                                                        &challenge)))
 544                         {
 545                                 NDR_PRINT_DEBUG(CHALLENGE_MESSAGE, &challenge);
 546                         }
 547                 }
 548         }
 549
 550         data_blob_free(&struct_blob);
 551
 552         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 553
 554         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 555 }
 556
 557 /**
 558  * Next state function for the Authenticate packet
 559  *
 560  * @param ntlmssp_state NTLMSSP State
 561  * @param request The request, as a DATA_BLOB
 562  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 563  * @return Errors or NT_STATUS_OK.
 564  */
 565
 566 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
 567                                     const DATA_BLOB request, DATA_BLOB *reply)
 568 {
 569         DATA_BLOB encrypted_session_key = data_blob_null;
 570         DATA_BLOB user_session_key = data_blob_null;
 571         DATA_BLOB lm_session_key = data_blob_null;
 572         DATA_BLOB session_key = data_blob_null;
 573         uint32_t ntlmssp_command, auth_flags;
 574         NTSTATUS nt_status = NT_STATUS_OK;
 575         struct AUTHENTICATE_MESSAGE authenticate;
 576
 577         /* used by NTLM2 */
 578         bool doing_ntlm2 = False;
 579
 580         uint8_t session_nonce[16];
 581         uint8_t session_nonce_hash[16];
 582
 583         const char *parse_string;
 584
 585         /* parse the NTLMSSP packet */
 586         *reply = data_blob_null;
 587
 588 #if 0
 589         file_save("ntlmssp_auth.dat", request.data, request.length);
 590 #endif
 591
 592         if (ntlmssp_state->unicode) {
 593                 parse_string = "CdBBUUUBd";
 594         } else {
 595                 parse_string = "CdBBAAABd";
 596         }
 597
 598         data_blob_free(&ntlmssp_state->lm_resp);
 599         data_blob_free(&ntlmssp_state->nt_resp);
 600
 601         ntlmssp_state->user = NULL;
 602         ntlmssp_state->domain = NULL;
 603
 604         /* now the NTLMSSP encoded auth hashes */
 605         if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 606                          "NTLMSSP",
 607                          &ntlmssp_command,
 608                          &ntlmssp_state->lm_resp,
 609                          &ntlmssp_state->nt_resp,
 610                          &ntlmssp_state->domain,
 611                          &ntlmssp_state->user,
 612                          &ntlmssp_state->client.netbios_name,
 613                          &encrypted_session_key,
 614                          &auth_flags)) {
 615                 auth_flags = 0;
 616
 617                 /* Try again with a shorter string (Win9X truncates this packet) */
 618                 if (ntlmssp_state->unicode) {
 619                         parse_string = "CdBBUUU";
 620                 } else {
 621                         parse_string = "CdBBAAA";
 622                 }
 623
 624                 /* now the NTLMSSP encoded auth hashes */
 625                 if (!msrpc_parse(ntlmssp_state, &request, parse_string,
 626                                  "NTLMSSP",
 627                                  &ntlmssp_command,
 628                                  &ntlmssp_state->lm_resp,
 629                                  &ntlmssp_state->nt_resp,
 630                                  &ntlmssp_state->domain,
 631                                  &ntlmssp_state->user,
 632                                  &ntlmssp_state->client.netbios_name)) {
 633                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
 634                         dump_data(2, request.data, request.length);
 635
 636                         return NT_STATUS_INVALID_PARAMETER;
 637                 }
 638         }
 639
 640         if (auth_flags)
 641                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
 642
 643         if (DEBUGLEVEL >= 10) {
 644                 if (NT_STATUS_IS_OK(ntlmssp_pull_AUTHENTICATE_MESSAGE(&request,
 645                                                   ntlmssp_state,
 646                                                   &authenticate)))
 647                 {
 648                         NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE, &authenticate);
 649                 }
 650         }
 651
 652         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 653                  ntlmssp_state->user, ntlmssp_state->domain,
 654                  ntlmssp_state->client.netbios_name,
 655                  (unsigned long)ntlmssp_state->lm_resp.length,
 656                  (unsigned long)ntlmssp_state->nt_resp.length));
 657
 658 #if 0
 659         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 660         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 661 #endif
 662
 663         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 664            client challenge
 665
 666            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 667         */
 668         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 669                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 670                         struct MD5Context md5_session_nonce_ctx;
 671                         SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
 672
 673                         doing_ntlm2 = True;
 674
 675                         memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
 676                         memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 677
 678                         MD5Init(&md5_session_nonce_ctx);
 679                         MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
 680                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 681
 682                         ntlmssp_state->chal = data_blob_talloc(
 683                                 ntlmssp_state, session_nonce_hash, 8);
 684
 685                         /* LM response is no longer useful */
 686                         data_blob_free(&ntlmssp_state->lm_resp);
 687
 688                         /* We changed the effective challenge - set it */
 689                         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
 690                                 data_blob_free(&encrypted_session_key);
 691                                 return nt_status;
 692                         }
 693
 694                         /* LM Key is incompatible. */
 695                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 696                 }
 697         }
 698
 699         /*
 700          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 701          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 702          * smb.conf file) and no NTLMv2 response was sent then the password check
 703          * will fail here. JRA.
 704          */
 705
 706         /* Finally, actually ask if the password is OK */
 707
 708         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
 709                                                                        &user_session_key, &lm_session_key))) {
 710                 data_blob_free(&encrypted_session_key);
 711                 return nt_status;
 712         }
 713
 714         dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
 715         dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
 716
 717         /* Handle the different session key derivation for NTLM2 */
 718         if (doing_ntlm2) {
 719                 if (user_session_key.data && user_session_key.length == 16) {
 720                         session_key = data_blob_talloc(ntlmssp_state,
 721                                                        NULL, 16);
 722                         hmac_md5(user_session_key.data, session_nonce,
 723                                  sizeof(session_nonce), session_key.data);
 724                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 725                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 726
 727                 } else {
 728                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 729                         session_key = data_blob_null;
 730                 }
 731         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
 732                 if (lm_session_key.data && lm_session_key.length >= 8) {
 733                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 734                                 session_key = data_blob_talloc(ntlmssp_state,
 735                                                                NULL, 16);
 736                                 if (session_key.data == NULL) {
 737                                         return NT_STATUS_NO_MEMORY;
 738                                 }
 739                                 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
 740                                                           session_key.data);
 741                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 742                         } else {
 743                                 static const uint8_t zeros[24] = {0, };
 744                                 session_key = data_blob_talloc(
 745                                         ntlmssp_state, NULL, 16);
 746                                 if (session_key.data == NULL) {
 747                                         return NT_STATUS_NO_MEMORY;
 748                                 }
 749                                 SMBsesskeygen_lm_sess_key(
 750                                         lm_session_key.data, zeros,
 751                                         session_key.data);
 752                         }
 753                         dump_data_pw("LM session key:\n", session_key.data,
 754                                      session_key.length);
 755                 } else {
 756                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 757                         session_key = data_blob_null;
 758                 }
 759         } else if (user_session_key.data) {
 760                 session_key = user_session_key;
 761                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 762                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 763         } else if (lm_session_key.data) {
 764                 session_key = lm_session_key;
 765                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 766                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 767         } else {
 768                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 769                 session_key = data_blob_null;
 770         }
 771
 772         /* With KEY_EXCH, the client supplies the proposed session key,
 773            but encrypts it with the long-term key */
 774         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 775                 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
 776                         data_blob_free(&encrypted_session_key);
 777                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 778                                   (unsigned int)encrypted_session_key.length));
 779                         return NT_STATUS_INVALID_PARAMETER;
 780                 } else if (!session_key.data || session_key.length != 16) {
 781                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 782                                   (unsigned int)session_key.length));
 783                         ntlmssp_state->session_key = session_key;
 784                 } else {
 785                         dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
 786                         arcfour_crypt_blob(encrypted_session_key.data,
 787                                            encrypted_session_key.length,
 788                                            &session_key);
 789                         ntlmssp_state->session_key = data_blob_talloc(
 790                                 ntlmssp_state, encrypted_session_key.data,
 791                                 encrypted_session_key.length);
 792                         dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
 793                                      encrypted_session_key.length);
 794                 }
 795         } else {
 796                 ntlmssp_state->session_key = session_key;
 797         }
 798
 799         if (!NT_STATUS_IS_OK(nt_status)) {
 800                 ntlmssp_state->session_key = data_blob_null;
 801         } else if (ntlmssp_state->session_key.length) {
 802                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 803         }
 804
 805         data_blob_free(&encrypted_session_key);
 806
 807         /* Only one authentication allowed per server state. */
 808         ntlmssp_state->expected_state = NTLMSSP_DONE;
 809
 810         return nt_status;
 811 }
 812
 813 /**
 814  * Create an NTLMSSP state machine
 815  *
 816  * @param ntlmssp_state NTLMSSP State, allocated by this function
 817  */
 818
 819 NTSTATUS ntlmssp_server_start(TALLOC_CTX *mem_ctx,
 820                               bool is_standalone,
 821                               const char *netbios_name,
 822                               const char *netbios_domain,
 823                               const char *dns_name,
 824                               const char *dns_domain,
 825                               struct ntlmssp_state **_ntlmssp_state)
 826 {
 827         struct ntlmssp_state *ntlmssp_state;
 828
 829         if (!netbios_name) {
 830                 netbios_name = "";
 831         }
 832
 833         if (!netbios_domain) {
 834                 netbios_domain = "";
 835         }
 836
 837         if (!dns_domain) {
 838                 dns_domain = "";
 839         }
 840
 841         if (!dns_name) {
 842                 dns_name = "";
 843         }
 844
 845         ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
 846         if (!ntlmssp_state) {
 847                 return NT_STATUS_NO_MEMORY;
 848         }
 849
 850         ntlmssp_state->role = NTLMSSP_SERVER;
 851
 852         ntlmssp_state->get_challenge = get_challenge;
 853         ntlmssp_state->set_challenge = set_challenge;
 854         ntlmssp_state->may_set_challenge = may_set_challenge;
 855
 856         ntlmssp_state->server.is_standalone = is_standalone;
 857
 858         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 859
 860         ntlmssp_state->neg_flags =
 861                 NTLMSSP_NEGOTIATE_128 |
 862                 NTLMSSP_NEGOTIATE_56 |
 863                 NTLMSSP_NEGOTIATE_VERSION |
 864                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
 865                 NTLMSSP_NEGOTIATE_NTLM |
 866                 NTLMSSP_NEGOTIATE_NTLM2 |
 867                 NTLMSSP_NEGOTIATE_KEY_EXCH |
 868                 NTLMSSP_NEGOTIATE_SIGN |
 869                 NTLMSSP_NEGOTIATE_SEAL;
 870
 871         ntlmssp_state->server.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
 872         if (!ntlmssp_state->server.netbios_name) {
 873                 talloc_free(ntlmssp_state);
 874                 return NT_STATUS_NO_MEMORY;
 875         }
 876         ntlmssp_state->server.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
 877         if (!ntlmssp_state->server.netbios_domain) {
 878                 talloc_free(ntlmssp_state);
 879                 return NT_STATUS_NO_MEMORY;
 880         }
 881         ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state, dns_name);
 882         if (!ntlmssp_state->server.dns_name) {
 883                 talloc_free(ntlmssp_state);
 884                 return NT_STATUS_NO_MEMORY;
 885         }
 886         ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state, dns_domain);
 887         if (!ntlmssp_state->server.dns_domain) {
 888                 talloc_free(ntlmssp_state);
 889                 return NT_STATUS_NO_MEMORY;
 890         }
 891
 892         *_ntlmssp_state = ntlmssp_state;
 893         return NT_STATUS_OK;
 894 }
 895
 896 /*********************************************************************
 897  Client side NTLMSSP
 898 *********************************************************************/
 899
 900 /**
 901  * Next state function for the Initial packet
 902  *
 903  * @param ntlmssp_state NTLMSSP State
 904  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 905  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 906  * @return Errors or NT_STATUS_OK.
 907  */
 908
 909 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
 910                                   DATA_BLOB reply, DATA_BLOB *next_request)
 911 {
 912         struct NEGOTIATE_MESSAGE negotiate;
 913
 914         if (ntlmssp_state->unicode) {
 915                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
 916         } else {
 917                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
 918         }
 919
 920         if (ntlmssp_state->use_ntlmv2) {
 921                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 922         }
 923
 924         /* generate the ntlmssp negotiate packet */
 925         msrpc_gen(ntlmssp_state, next_request, "CddAA",
 926                   "NTLMSSP",
 927                   NTLMSSP_NEGOTIATE,
 928                   ntlmssp_state->neg_flags,
 929                   ntlmssp_state->client.netbios_domain,
 930                   ntlmssp_state->client.netbios_name);
 931
 932         if (DEBUGLEVEL >= 10) {
 933                 if (NT_STATUS_IS_OK(ntlmssp_pull_NEGOTIATE_MESSAGE(next_request,
 934                                                ntlmssp_state,
 935                                                &negotiate)))
 936                 {
 937                         NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE, &negotiate);
 938                 }
 939         }
 940
 941         ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
 942
 943         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 944 }
 945
 946 /**
 947  * Next state function for the Challenge Packet.  Generate an auth packet.
 948  *
 949  * @param ntlmssp_state NTLMSSP State
 950  * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 951  * @param request The reply, as an allocated DATA_BLOB, caller to free.
 952  * @return Errors or NT_STATUS_OK.
 953  */
 954
 955 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
 956                                          const DATA_BLOB reply, DATA_BLOB *next_request)
 957 {
 958         uint32_t chal_flags, ntlmssp_command, unkn1, unkn2;
 959         DATA_BLOB server_domain_blob;
 960         DATA_BLOB challenge_blob;
 961         DATA_BLOB struct_blob = data_blob_null;
 962         char *server_domain;
 963         const char *chal_parse_string;
 964         const char *auth_gen_string;
 965         DATA_BLOB lm_response = data_blob_null;
 966         DATA_BLOB nt_response = data_blob_null;
 967         DATA_BLOB session_key = data_blob_null;
 968         DATA_BLOB encrypted_session_key = data_blob_null;
 969         NTSTATUS nt_status = NT_STATUS_OK;
 970         struct CHALLENGE_MESSAGE challenge;
 971         struct AUTHENTICATE_MESSAGE authenticate;
 972
 973         if (ntlmssp_state->use_ccache) {
 974                 struct wbcCredentialCacheParams params;
 975                 struct wbcCredentialCacheInfo *info = NULL;
 976                 struct wbcAuthErrorInfo *error = NULL;
 977                 struct wbcNamedBlob auth_blob;
 978                 struct wbcBlob *wbc_next = NULL;
 979                 struct wbcBlob *wbc_session_key = NULL;
 980                 wbcErr wbc_status;
 981                 int i;
 982
 983                 params.account_name = ntlmssp_state->user;
 984                 params.domain_name = ntlmssp_state->domain;
 985                 params.level = WBC_CREDENTIAL_CACHE_LEVEL_NTLMSSP;
 986
 987                 auth_blob.name = "challenge_blob";
 988                 auth_blob.flags = 0;
 989                 auth_blob.blob.data = reply.data;
 990                 auth_blob.blob.length = reply.length;
 991                 params.num_blobs = 1;
 992                 params.blobs = &auth_blob;
 993
 994                 wbc_status = wbcCredentialCache(&params, &info, &error);
 995                 if (error != NULL) {
 996                         wbcFreeMemory(error);
 997                 }
 998                 if (!WBC_ERROR_IS_OK(wbc_status)) {
 999                         goto noccache;
1000                 }
1001
1002                 for (i=0; i<info->num_blobs; i++) {
1003                         if (strequal(info->blobs[i].name, "auth_blob")) {
1004                                 wbc_next = &info->blobs[i].blob;
1005                         }
1006                         if (strequal(info->blobs[i].name, "session_key")) {
1007                                 wbc_session_key = &info->blobs[i].blob;
1008                         }
1009                 }
1010                 if ((wbc_next == NULL) || (wbc_session_key == NULL)) {
1011                         wbcFreeMemory(info);
1012                         goto noccache;
1013                 }
1014
1015                 *next_request = data_blob(wbc_next->data, wbc_next->length);
1016                 ntlmssp_state->session_key = data_blob(
1017                         wbc_session_key->data, wbc_session_key->length);
1018
1019                 wbcFreeMemory(info);
1020                 goto done;
1021         }
1022
1023 noccache:
1024
1025         if (!msrpc_parse(ntlmssp_state, &reply, "CdBd",
1026                          "NTLMSSP",
1027                          &ntlmssp_command,
1028                          &server_domain_blob,
1029                          &chal_flags)) {
1030                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
1031                 dump_data(2, reply.data, reply.length);
1032
1033                 return NT_STATUS_INVALID_PARAMETER;
1034         }
1035
1036         if (DEBUGLEVEL >= 10) {
1037                 if (NT_STATUS_IS_OK(ntlmssp_pull_CHALLENGE_MESSAGE(&reply,
1038                                                ntlmssp_state,
1039                                                &challenge)))
1040                 {
1041                         NDR_PRINT_DEBUG(CHALLENGE_MESSAGE, &challenge);
1042                 }
1043         }
1044
1045         data_blob_free(&server_domain_blob);
1046
1047         DEBUG(3, ("Got challenge flags:\n"));
1048         debug_ntlmssp_flags(chal_flags);
1049
1050         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
1051
1052         if (ntlmssp_state->unicode) {
1053                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
1054                         chal_parse_string = "CdUdbddB";
1055                 } else {
1056                         chal_parse_string = "CdUdbdd";
1057                 }
1058                 auth_gen_string = "CdBBUUUBd";
1059         } else {
1060                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
1061                         chal_parse_string = "CdAdbddB";
1062                 } else {
1063                         chal_parse_string = "CdAdbdd";
1064                 }
1065
1066                 auth_gen_string = "CdBBAAABd";
1067         }
1068
1069         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
1070         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
1071
1072         if (!msrpc_parse(ntlmssp_state, &reply, chal_parse_string,
1073                          "NTLMSSP",
1074                          &ntlmssp_command,
1075                          &server_domain,
1076                          &chal_flags,
1077                          &challenge_blob, 8,
1078                          &unkn1, &unkn2,
1079                          &struct_blob)) {
1080                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
1081                 dump_data(2, reply.data, reply.length);
1082                 return NT_STATUS_INVALID_PARAMETER;
1083         }
1084
1085         if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
1086                 ntlmssp_state->server.is_standalone = true;
1087         } else {
1088                 ntlmssp_state->server.is_standalone = false;
1089         }
1090         /* TODO: parse struct_blob and fill in the rest */
1091         ntlmssp_state->server.netbios_name = "";
1092         ntlmssp_state->server.netbios_domain = server_domain;
1093         ntlmssp_state->server.dns_name = "";
1094         ntlmssp_state->server.dns_domain = "";
1095
1096         if (challenge_blob.length != 8) {
1097                 data_blob_free(&struct_blob);
1098                 return NT_STATUS_INVALID_PARAMETER;
1099         }
1100
1101         if (!ntlmssp_state->nt_hash || !ntlmssp_state->lm_hash) {
1102                 static const uint8_t zeros[16] = {0, };
1103                 /* do nothing - blobs are zero length */
1104
1105                 /* session key is all zeros */
1106                 session_key = data_blob_talloc(ntlmssp_state, zeros, 16);
1107
1108                 /* not doing NLTM2 without a password */
1109                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
1110         } else if (ntlmssp_state->use_ntlmv2) {
1111                 if (!struct_blob.length) {
1112                         /* be lazy, match win2k - we can't do NTLMv2 without it */
1113                         DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
1114                         return NT_STATUS_INVALID_PARAMETER;
1115                 }
1116
1117                 /* TODO: if the remote server is standalone, then we should replace 'domain'
1118                    with the server name as supplied above */
1119
1120                 if (!SMBNTLMv2encrypt_hash(ntlmssp_state,
1121                                            ntlmssp_state->user,
1122                                            ntlmssp_state->domain,
1123                                            ntlmssp_state->nt_hash, &challenge_blob,
1124                                            &struct_blob,
1125                                            &lm_response, &nt_response, NULL,
1126                                            &session_key)) {
1127                         data_blob_free(&challenge_blob);
1128                         data_blob_free(&struct_blob);
1129                         return NT_STATUS_NO_MEMORY;
1130                 }
1131         } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
1132                 struct MD5Context md5_session_nonce_ctx;
1133                 uint8_t session_nonce[16];
1134                 uint8_t session_nonce_hash[16];
1135                 uint8_t user_session_key[16];
1136
1137                 lm_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1138                 generate_random_buffer(lm_response.data, 8);
1139                 memset(lm_response.data+8, 0, 16);
1140
1141                 memcpy(session_nonce, challenge_blob.data, 8);
1142                 memcpy(&session_nonce[8], lm_response.data, 8);
1143
1144                 MD5Init(&md5_session_nonce_ctx);
1145                 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
1146                 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
1147                 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
1148
1149                 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
1150                 DEBUG(5, ("challenge is: \n"));
1151                 dump_data(5, session_nonce_hash, 8);
1152
1153                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1154                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,
1155                                   session_nonce_hash,
1156                                   nt_response.data);
1157
1158                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
1159
1160                 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, user_session_key);
1161                 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
1162                 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
1163         } else {
1164                 /* lanman auth is insecure, it may be disabled */
1165                 if (lp_client_lanman_auth()) {
1166                         lm_response = data_blob_talloc(ntlmssp_state,
1167                                                        NULL, 24);
1168                         SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
1169                                    lm_response.data);
1170                 }
1171
1172                 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1173                 SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
1174                              nt_response.data);
1175
1176                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
1177                 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
1178                     && lp_client_lanman_auth()) {
1179                         SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
1180                                         session_key.data);
1181                         dump_data_pw("LM session key\n", session_key.data, session_key.length);
1182                 } else {
1183                         SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, session_key.data);
1184                         dump_data_pw("NT session key:\n", session_key.data, session_key.length);
1185                 }
1186         }
1187         data_blob_free(&struct_blob);
1188
1189         /* Key exchange encryptes a new client-generated session key with
1190            the password-derived key */
1191         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
1192                 /* Make up a new session key */
1193                 uint8_t client_session_key[16];
1194                 generate_random_buffer(client_session_key, sizeof(client_session_key));
1195
1196                 /* Encrypt the new session key with the old one */
1197                 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
1198                 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
1199                 arcfour_crypt_blob(encrypted_session_key.data, encrypted_session_key.length, &session_key);
1200                 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
1201
1202                 /* Mark the new session key as the 'real' session key */
1203                 data_blob_free(&session_key);
1204                 session_key = data_blob_talloc(ntlmssp_state,
1205                                                client_session_key,
1206                                                sizeof(client_session_key));
1207         }
1208
1209         /* this generates the actual auth packet */
1210         if (!msrpc_gen(ntlmssp_state, next_request, auth_gen_string,
1211                        "NTLMSSP",
1212                        NTLMSSP_AUTH,
1213                        lm_response.data, lm_response.length,
1214                        nt_response.data, nt_response.length,
1215                        ntlmssp_state->domain,
1216                        ntlmssp_state->user,
1217                        ntlmssp_state->client.netbios_name,
1218                        encrypted_session_key.data, encrypted_session_key.length,
1219                        ntlmssp_state->neg_flags)) {
1220
1221                 return NT_STATUS_NO_MEMORY;
1222         }
1223
1224         if (DEBUGLEVEL >= 10) {
1225                 if (NT_STATUS_IS_OK(ntlmssp_pull_AUTHENTICATE_MESSAGE(next_request,
1226                                                   ntlmssp_state,
1227                                                   &authenticate)))
1228                 {
1229                         NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE, &authenticate);
1230                 }
1231         }
1232
1233         data_blob_free(&encrypted_session_key);
1234
1235         data_blob_free(&ntlmssp_state->chal);
1236
1237         ntlmssp_state->session_key = session_key;
1238
1239         ntlmssp_state->chal = challenge_blob;
1240         ntlmssp_state->lm_resp = lm_response;
1241         ntlmssp_state->nt_resp = nt_response;
1242
1243 done:
1244
1245         ntlmssp_state->expected_state = NTLMSSP_DONE;
1246
1247         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
1248                 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
1249         }
1250
1251         return nt_status;
1252 }
1253
1254 NTSTATUS ntlmssp_client_start(TALLOC_CTX *mem_ctx,
1255                               const char *netbios_name,
1256                               const char *netbios_domain,
1257                               bool use_ntlmv2,
1258                               struct ntlmssp_state **_ntlmssp_state)
1259 {
1260         struct ntlmssp_state *ntlmssp_state;
1261
1262         if (!netbios_name) {
1263                 netbios_name = "";
1264         }
1265
1266         if (!netbios_domain) {
1267                 netbios_domain = "";
1268         }
1269
1270         ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
1271         if (!ntlmssp_state) {
1272                 return NT_STATUS_NO_MEMORY;
1273         }
1274
1275         ntlmssp_state->role = NTLMSSP_CLIENT;
1276
1277         ntlmssp_state->unicode = True;
1278
1279         ntlmssp_state->use_ntlmv2 = use_ntlmv2;
1280
1281         ntlmssp_state->expected_state = NTLMSSP_INITIAL;
1282
1283         ntlmssp_state->neg_flags =
1284                 NTLMSSP_NEGOTIATE_128 |
1285                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
1286                 NTLMSSP_NEGOTIATE_NTLM |
1287                 NTLMSSP_NEGOTIATE_NTLM2 |
1288                 NTLMSSP_NEGOTIATE_KEY_EXCH |
1289                 NTLMSSP_REQUEST_TARGET;
1290
1291         ntlmssp_state->client.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
1292         if (!ntlmssp_state->client.netbios_name) {
1293                 talloc_free(ntlmssp_state);
1294                 return NT_STATUS_NO_MEMORY;
1295         }
1296         ntlmssp_state->client.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
1297         if (!ntlmssp_state->client.netbios_domain) {
1298                 talloc_free(ntlmssp_state);
1299                 return NT_STATUS_NO_MEMORY;
1300         }
1301
1302         *_ntlmssp_state = ntlmssp_state;
1303         return NT_STATUS_OK;
1304 }