source4/libcli/auth/spnego.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    RFC2478 Compliant SPNEGO implementation
   5
   6    Copyright (C) Jim McDonough <jmcd@us.ibm.com>      2003
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "includes.h"
  26
  27 #undef DBGC_CLASS
  28 #define DBGC_CLASS DBGC_AUTH
  29
  30 enum spnego_state_position {
  31         SPNEGO_SERVER_START,
  32         SPNEGO_CLIENT_START,
  33         SPNEGO_SERVER_TARG,
  34         SPNEGO_CLIENT_TARG,
  35         SPNEGO_FALLBACK,
  36         SPNEGO_DONE
  37 };
  38
  39 struct spnego_state {
  40         uint_t ref_count;
  41         enum spnego_message_type expected_packet;
  42         enum spnego_state_position state_position;
  43         struct gensec_security *sub_sec_security;
  44 };
  45
  46 static NTSTATUS gensec_spnego_client_start(struct gensec_security *gensec_security)
  47 {
  48         struct spnego_state *spnego_state;
  49
  50         spnego_state = talloc_p(gensec_security, struct spnego_state);
  51         if (!spnego_state) {
  52                 return NT_STATUS_NO_MEMORY;
  53         }
  54
  55         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
  56         spnego_state->state_position = SPNEGO_CLIENT_START;
  57         spnego_state->sub_sec_security = NULL;
  58
  59         gensec_security->private_data = spnego_state;
  60         return NT_STATUS_OK;
  61 }
  62
  63 static NTSTATUS gensec_spnego_server_start(struct gensec_security *gensec_security)
  64 {
  65         struct spnego_state *spnego_state;
  66
  67         spnego_state = talloc_p(gensec_security, struct spnego_state);
  68         if (!spnego_state) {
  69                 return NT_STATUS_NO_MEMORY;
  70         }
  71
  72         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
  73         spnego_state->state_position = SPNEGO_SERVER_START;
  74         spnego_state->sub_sec_security = NULL;
  75
  76         gensec_security->private_data = spnego_state;
  77         return NT_STATUS_OK;
  78 }
  79
  80 /*
  81   wrappers for the spnego_*() functions
  82 */
  83 static NTSTATUS gensec_spnego_unseal_packet(struct gensec_security *gensec_security,
  84                                             TALLOC_CTX *mem_ctx,
  85                                             uint8_t *data, size_t length,
  86                                             const uint8_t *whole_pdu, size_t pdu_length,
  87                                             DATA_BLOB *sig)
  88 {
  89         struct spnego_state *spnego_state = gensec_security->private_data;
  90
  91         if (spnego_state->state_position != SPNEGO_DONE
  92             && spnego_state->state_position != SPNEGO_FALLBACK) {
  93                 return NT_STATUS_INVALID_PARAMETER;
  94         }
  95
  96         return gensec_unseal_packet(spnego_state->sub_sec_security,
  97                                     mem_ctx,
  98                                     data, length,
  99                                     whole_pdu, pdu_length,
 100                                     sig);
 101 }
 102
 103 static NTSTATUS gensec_spnego_check_packet(struct gensec_security *gensec_security,
 104                                            TALLOC_CTX *mem_ctx,
 105                                            const uint8_t *data, size_t length,
 106                                            const uint8_t *whole_pdu, size_t pdu_length,
 107                                            const DATA_BLOB *sig)
 108 {
 109         struct spnego_state *spnego_state = gensec_security->private_data;
 110
 111         return NT_STATUS_NOT_IMPLEMENTED;
 112         if (spnego_state->state_position != SPNEGO_DONE
 113             && spnego_state->state_position != SPNEGO_FALLBACK) {
 114                 return NT_STATUS_INVALID_PARAMETER;
 115         }
 116
 117         return gensec_check_packet(spnego_state->sub_sec_security,
 118                                    mem_ctx,
 119                                    data, length,
 120                                    whole_pdu, pdu_length,
 121                                    sig);
 122 }
 123
 124 static NTSTATUS gensec_spnego_seal_packet(struct gensec_security *gensec_security,
 125                                           TALLOC_CTX *mem_ctx,
 126                                           uint8_t *data, size_t length,
 127                                           const uint8_t *whole_pdu, size_t pdu_length,
 128                                           DATA_BLOB *sig)
 129 {
 130         struct spnego_state *spnego_state = gensec_security->private_data;
 131
 132         return NT_STATUS_NOT_IMPLEMENTED;
 133         if (spnego_state->state_position != SPNEGO_DONE
 134             && spnego_state->state_position != SPNEGO_FALLBACK) {
 135                 return NT_STATUS_INVALID_PARAMETER;
 136         }
 137
 138         return gensec_seal_packet(spnego_state->sub_sec_security,
 139                                   mem_ctx,
 140                                   data, length,
 141                                   whole_pdu, pdu_length,
 142                                   sig);
 143 }
 144
 145 static NTSTATUS gensec_spnego_sign_packet(struct gensec_security *gensec_security,
 146                                           TALLOC_CTX *mem_ctx,
 147                                           const uint8_t *data, size_t length,
 148                                           const uint8_t *whole_pdu, size_t pdu_length,
 149                                           DATA_BLOB *sig)
 150 {
 151         struct spnego_state *spnego_state = gensec_security->private_data;
 152
 153         if (spnego_state->state_position != SPNEGO_DONE
 154             && spnego_state->state_position != SPNEGO_FALLBACK) {
 155                 return NT_STATUS_INVALID_PARAMETER;
 156         }
 157
 158         return gensec_sign_packet(spnego_state->sub_sec_security,
 159                                   mem_ctx,
 160                                   data, length,
 161                                   whole_pdu, pdu_length,
 162                                   sig);
 163 }
 164
 165 static size_t gensec_spnego_sig_size(struct gensec_security *gensec_security)
 166 {
 167         struct spnego_state *spnego_state = gensec_security->private_data;
 168
 169         if (spnego_state->state_position != SPNEGO_DONE
 170             && spnego_state->state_position != SPNEGO_FALLBACK) {
 171                 return 0;
 172         }
 173
 174         return gensec_sig_size(spnego_state->sub_sec_security);
 175 }
 176
 177 static NTSTATUS gensec_spnego_session_key(struct gensec_security *gensec_security,
 178                                           DATA_BLOB *session_key)
 179 {
 180         struct spnego_state *spnego_state = gensec_security->private_data;
 181         if (!spnego_state->sub_sec_security) {
 182                 return NT_STATUS_INVALID_PARAMETER;
 183         }
 184
 185         return gensec_session_key(spnego_state->sub_sec_security,
 186                                   session_key);
 187 }
 188
 189 static NTSTATUS gensec_spnego_session_info(struct gensec_security *gensec_security,
 190                                                                       struct auth_session_info **session_info)
 191 {
 192         struct spnego_state *spnego_state = gensec_security->private_data;
 193         if (!spnego_state->sub_sec_security) {
 194                 return NT_STATUS_INVALID_PARAMETER;
 195         }
 196
 197         return gensec_session_info(spnego_state->sub_sec_security,
 198                                    session_info);
 199 }
 200
 201 /** Fallback to another GENSEC mechanism, based on magic strings
 202  *
 203  * This is the 'fallback' case, where we don't get SPNEGO, and have to
 204  * try all the other options (and hope they all have a magic string
 205  * they check)
 206 */
 207
 208 static NTSTATUS gensec_spnego_server_try_fallback(struct gensec_security *gensec_security,
 209                                                   struct spnego_state *spnego_state,
 210                                                   TALLOC_CTX *out_mem_ctx,
 211                                                   const DATA_BLOB in, DATA_BLOB *out)
 212 {
 213         int i;
 214         int num_ops;
 215         const struct gensec_security_ops **all_ops = gensec_security_all(&num_ops);
 216         for (i=0; i < num_ops; i++) {
 217                 NTSTATUS nt_status;
 218                 if (!all_ops[i]->oid) {
 219                         continue;
 220                 }
 221                 nt_status = gensec_subcontext_start(gensec_security,
 222                                                     &spnego_state->sub_sec_security);
 223                 if (!NT_STATUS_IS_OK(nt_status)) {
 224                         return nt_status;
 225                 }
 226                 /* select the sub context */
 227                 nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
 228                                                      all_ops[i]->oid);
 229                 if (!NT_STATUS_IS_OK(nt_status)) {
 230                         gensec_end(&spnego_state->sub_sec_security);
 231                                         continue;
 232                 }
 233                 nt_status = gensec_update(spnego_state->sub_sec_security,
 234                                                           out_mem_ctx, in, out);
 235                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 236                         spnego_state->state_position = SPNEGO_FALLBACK;
 237                         return nt_status;
 238                 }
 239                 gensec_end(&spnego_state->sub_sec_security);
 240         }
 241         DEBUG(1, ("Failed to parse SPNEGO request\n"));
 242         return NT_STATUS_INVALID_PARAMETER;
 243
 244 }
 245
 246 static NTSTATUS gensec_spnego_parse_negTokenInit(struct gensec_security *gensec_security,
 247                                                  struct spnego_state *spnego_state,
 248                                                  TALLOC_CTX *out_mem_ctx,
 249                                                  const char **mechType,
 250                                                  const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out)
 251 {
 252         int i;
 253         NTSTATUS nt_status;
 254         DATA_BLOB null_data_blob = data_blob(NULL,0);
 255
 256         for (i=0; mechType && mechType[i]; i++) {
 257                 nt_status = gensec_subcontext_start(gensec_security,
 258                                                     &spnego_state->sub_sec_security);
 259                 if (!NT_STATUS_IS_OK(nt_status)) {
 260                         break;
 261                 }
 262                 /* select the sub context */
 263                 nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
 264                                                      mechType[i]);
 265                 if (!NT_STATUS_IS_OK(nt_status)) {
 266                         gensec_end(&spnego_state->sub_sec_security);
 267                         continue;
 268                 }
 269
 270                 if (i == 0) {
 271                         nt_status = gensec_update(spnego_state->sub_sec_security,
 272                                                   out_mem_ctx,
 273                                                   unwrapped_in,
 274                                                   unwrapped_out);
 275                 } else {
 276                         /* only get the helping start blob for the first OID */
 277                         nt_status = gensec_update(spnego_state->sub_sec_security,
 278                                                   out_mem_ctx,
 279                                                   null_data_blob,
 280                                                   unwrapped_out);
 281                 }
 282                 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
 283                     && (!NT_STATUS_IS_OK(nt_status))) {
 284                         DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
 285                                   spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
 286                                 gensec_end(&spnego_state->sub_sec_security);
 287                 } else {
 288                         break;
 289                 }
 290         }
 291         if (!mechType || !mechType[i]) {
 292                 DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
 293         }
 294         return nt_status;
 295 }
 296
 297 /** create a client negTokenInit
 298  *
 299  * This is the case, where the client is the first one who sends data
 300 */
 301
 302 static NTSTATUS gensec_spnego_client_negTokenInit(struct gensec_security *gensec_security,
 303                                                   struct spnego_state *spnego_state,
 304                                                   TALLOC_CTX *out_mem_ctx,
 305                                                   const DATA_BLOB in, DATA_BLOB *out)
 306 {
 307         DATA_BLOB null_data_blob = data_blob(NULL,0);
 308         NTSTATUS nt_status;
 309         const char **mechTypes = NULL;
 310         DATA_BLOB unwrapped_out = data_blob(NULL,0);
 311
 312         mechTypes = gensec_security_oids(out_mem_ctx, OID_SPNEGO);
 313
 314         if (!mechTypes) {
 315                 DEBUG(1, ("no GENSEC OID backends available\n"));
 316                 return NT_STATUS_INVALID_PARAMETER;
 317         }
 318
 319         nt_status = gensec_subcontext_start(gensec_security,
 320                                             &spnego_state->sub_sec_security);
 321         if (!NT_STATUS_IS_OK(nt_status)) {
 322                 return nt_status;
 323         }
 324         /* select our preferred mech */
 325         nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
 326                                              mechTypes[0]);
 327         if (!NT_STATUS_IS_OK(nt_status)) {
 328                 gensec_end(&spnego_state->sub_sec_security);
 329                         return nt_status;
 330         }
 331         nt_status = gensec_update(spnego_state->sub_sec_security,
 332                                   out_mem_ctx, in, &unwrapped_out);
 333         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 334                 struct spnego_data spnego_out;
 335                 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
 336                 spnego_out.negTokenInit.mechTypes = mechTypes;
 337                 spnego_out.negTokenInit.reqFlags = 0;
 338                 spnego_out.negTokenInit.mechListMIC = null_data_blob;
 339                 spnego_out.negTokenInit.mechToken = unwrapped_out;
 340
 341                 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 342                         DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
 343                                 return NT_STATUS_INVALID_PARAMETER;
 344                 }
 345
 346                 /* set next state */
 347                 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 348                 spnego_state->state_position = SPNEGO_CLIENT_TARG;
 349                 return nt_status;
 350         }
 351         gensec_end(&spnego_state->sub_sec_security);
 352
 353         DEBUG(1, ("Failed to setup SPNEGO netTokenInit request\n"));
 354         return NT_STATUS_INVALID_PARAMETER;
 355 }
 356
 357
 358 /** create a client negTokenTarg
 359  *
 360  * This is the case, where the client is the first one who sends data
 361 */
 362
 363 static NTSTATUS gensec_spnego_server_negTokenTarg(struct gensec_security *gensec_security,
 364                                                   struct spnego_state *spnego_state,
 365                                                   TALLOC_CTX *out_mem_ctx,
 366                                                   NTSTATUS nt_status,
 367                                                   const DATA_BLOB unwrapped_out, DATA_BLOB *out)
 368 {
 369         struct spnego_data spnego_out;
 370         DATA_BLOB null_data_blob = data_blob(NULL, 0);
 371
 372         /* compose reply */
 373         spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
 374         spnego_out.negTokenTarg.supportedMech
 375                 = spnego_state->sub_sec_security->ops->oid;
 376         spnego_out.negTokenTarg.responseToken = unwrapped_out;
 377         spnego_out.negTokenTarg.mechListMIC = null_data_blob;
 378
 379         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 380                 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
 381                 spnego_state->state_position = SPNEGO_SERVER_TARG;
 382         } else if (NT_STATUS_IS_OK(nt_status)) {
 383                 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
 384                 spnego_state->state_position = SPNEGO_DONE;
 385         } else {
 386                 spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
 387                 DEBUG(1, ("SPNEGO(%s) login failed: %s\n",
 388                           spnego_state->sub_sec_security->ops->name,
 389                           nt_errstr(nt_status)));
 390                 spnego_state->state_position = SPNEGO_DONE;
 391         }
 392
 393         if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 394                 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
 395                 return NT_STATUS_INVALID_PARAMETER;
 396         }
 397
 398         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 399
 400         return nt_status;
 401 }
 402
 403
 404 static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
 405                                      const DATA_BLOB in, DATA_BLOB *out)
 406 {
 407         struct spnego_state *spnego_state = gensec_security->private_data;
 408         DATA_BLOB null_data_blob = data_blob(NULL, 0);
 409         DATA_BLOB unwrapped_out = data_blob(NULL, 0);
 410         struct spnego_data spnego_out;
 411         struct spnego_data spnego;
 412
 413         ssize_t len;
 414
 415         *out = data_blob(NULL, 0);
 416
 417         if (!out_mem_ctx) {
 418                 out_mem_ctx = spnego_state;
 419         }
 420
 421         /* and switch into the state machine */
 422
 423         switch (spnego_state->state_position) {
 424         case SPNEGO_FALLBACK:
 425                 return gensec_update(spnego_state->sub_sec_security,
 426                                      out_mem_ctx, in, out);
 427         case SPNEGO_SERVER_START:
 428         {
 429                 if (in.length) {
 430                         NTSTATUS nt_status;
 431
 432                         len = spnego_read_data(in, &spnego);
 433                         if (len == -1) {
 434                                 return gensec_spnego_server_try_fallback(gensec_security, spnego_state, out_mem_ctx, in, out);
 435                         }
 436                         /* client sent NegTargetInit, we send NegTokenTarg */
 437
 438                         /* OK, so it's real SPNEGO, check the packet's the one we expect */
 439                         if (spnego.type != spnego_state->expected_packet) {
 440                                 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 441                                           spnego_state->expected_packet));
 442                                 dump_data(1, (const char *)in.data, in.length);
 443                                 spnego_free_data(&spnego);
 444                                 return NT_STATUS_INVALID_PARAMETER;
 445                         }
 446
 447                         nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
 448                                                                      spnego_state,
 449                                                                      out_mem_ctx,
 450                                                                      spnego.negTokenInit.mechTypes,
 451                                                                      spnego.negTokenInit.mechToken,
 452                                                                      &unwrapped_out);
 453
 454                         nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
 455                                                                       spnego_state,
 456                                                                       out_mem_ctx,
 457                                                                       nt_status,
 458                                                                       unwrapped_out,
 459                                                                       out);
 460
 461                         spnego_free_data(&spnego);
 462
 463                         return nt_status;
 464                 } else {
 465                         const char **mechlist = gensec_security_oids(out_mem_ctx, OID_SPNEGO);
 466
 467                         spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
 468                         spnego_out.negTokenInit.mechTypes = mechlist;
 469                         spnego_out.negTokenInit.reqFlags = 0;
 470                         spnego_out.negTokenInit.mechListMIC = null_data_blob;
 471                         spnego_out.negTokenInit.mechToken = unwrapped_out;
 472
 473                         if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 474                                 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
 475                                 return NT_STATUS_INVALID_PARAMETER;
 476                         }
 477
 478                         /* set next state */
 479                         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 480                         spnego_state->state_position = SPNEGO_SERVER_TARG;
 481
 482                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 483                 }
 484         }
 485
 486         case SPNEGO_CLIENT_START:
 487         {
 488                 /* The server offers a list of mechanisms */
 489
 490                 char *my_mechs[] = {NULL, NULL};
 491                 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
 492
 493                 if (!in.length) {
 494                         /* client to produce negTokenInit */
 495                         return gensec_spnego_client_negTokenInit(gensec_security, spnego_state, out_mem_ctx, in, out);
 496                 }
 497
 498                 len = spnego_read_data(in, &spnego);
 499
 500                 if (len == -1) {
 501                         DEBUG(1, ("Invalid SPNEGO request:\n"));
 502                         dump_data(1, (const char *)in.data, in.length);
 503                         return NT_STATUS_INVALID_PARAMETER;
 504                 }
 505
 506                 /* OK, so it's real SPNEGO, check the packet's the one we expect */
 507                 if (spnego.type != spnego_state->expected_packet) {
 508                         DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 509                                   spnego_state->expected_packet));
 510                         dump_data(1, (const char *)in.data, in.length);
 511                         spnego_free_data(&spnego);
 512                         return NT_STATUS_INVALID_PARAMETER;
 513                 }
 514
 515                 if (spnego.negTokenInit.targetPrincipal) {
 516                         DEBUG(5, ("Server claims it's principal name is %s\n", spnego.negTokenInit.targetPrincipal));
 517                         nt_status = gensec_set_target_principal(gensec_security,
 518                                                                 spnego.negTokenInit.targetPrincipal);
 519                         if (!NT_STATUS_IS_OK(nt_status)) {
 520                                 spnego_free_data(&spnego);
 521                                 return nt_status;
 522                         }
 523                 }
 524
 525                 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
 526                                                              spnego_state,
 527                                                              out_mem_ctx,
 528                                                              spnego.negTokenInit.mechTypes,
 529                                                              spnego.negTokenInit.mechToken,
 530                                                              &unwrapped_out);
 531
 532                 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
 533                         spnego_free_data(&spnego);
 534                         return nt_status;
 535                 }
 536
 537                 /* compose reply */
 538                 my_mechs[0] = spnego_state->sub_sec_security->ops->oid;
 539
 540                 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
 541                 spnego_out.negTokenInit.mechTypes = my_mechs;
 542                 spnego_out.negTokenInit.reqFlags = 0;
 543                 spnego_out.negTokenInit.mechListMIC = null_data_blob;
 544                 spnego_out.negTokenInit.mechToken = unwrapped_out;
 545
 546                 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 547                         DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
 548                                 return NT_STATUS_INVALID_PARAMETER;
 549                 }
 550
 551                 /* set next state */
 552                 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 553                 spnego_state->state_position = SPNEGO_CLIENT_TARG;
 554
 555                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 556         }
 557         case SPNEGO_SERVER_TARG:
 558         {
 559                 NTSTATUS nt_status;
 560                 if (!in.length) {
 561                         return NT_STATUS_INVALID_PARAMETER;
 562                 }
 563
 564                 len = spnego_read_data(in, &spnego);
 565
 566                 if (len == -1) {
 567                         DEBUG(1, ("Invalid SPNEGO request:\n"));
 568                         dump_data(1, (const char *)in.data, in.length);
 569                         return NT_STATUS_INVALID_PARAMETER;
 570                 }
 571
 572                 /* OK, so it's real SPNEGO, check the packet's the one we expect */
 573                 if (spnego.type != spnego_state->expected_packet) {
 574                         DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 575                                   spnego_state->expected_packet));
 576                         dump_data(1, (const char *)in.data, in.length);
 577                         spnego_free_data(&spnego);
 578                         return NT_STATUS_INVALID_PARAMETER;
 579                 }
 580
 581                 nt_status = gensec_update(spnego_state->sub_sec_security,
 582                                           out_mem_ctx,
 583                                           spnego.negTokenTarg.responseToken,
 584                                           &unwrapped_out);
 585
 586                 nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
 587                                                               spnego_state,
 588                                                               out_mem_ctx,
 589                                                               nt_status,
 590                                                               unwrapped_out,
 591                                                               out);
 592
 593                 spnego_free_data(&spnego);
 594
 595                 return nt_status;
 596         }
 597         case SPNEGO_CLIENT_TARG:
 598         {
 599                 NTSTATUS nt_status;
 600                 if (!in.length) {
 601                         return NT_STATUS_INVALID_PARAMETER;
 602                 }
 603
 604                 len = spnego_read_data(in, &spnego);
 605
 606                 if (len == -1) {
 607                         DEBUG(1, ("Invalid SPNEGO request:\n"));
 608                         dump_data(1, (const char *)in.data, in.length);
 609                         return NT_STATUS_INVALID_PARAMETER;
 610                 }
 611
 612                 /* OK, so it's real SPNEGO, check the packet's the one we expect */
 613                 if (spnego.type != spnego_state->expected_packet) {
 614                         DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 615                                   spnego_state->expected_packet));
 616                         dump_data(1, (const char *)in.data, in.length);
 617                         spnego_free_data(&spnego);
 618                         return NT_STATUS_INVALID_PARAMETER;
 619                 }
 620
 621                 if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
 622                         return NT_STATUS_ACCESS_DENIED;
 623                 }
 624
 625                 nt_status = gensec_update(spnego_state->sub_sec_security,
 626                                           out_mem_ctx,
 627                                           spnego.negTokenTarg.responseToken,
 628                                           &unwrapped_out);
 629
 630
 631                 if (NT_STATUS_IS_OK(nt_status)
 632                     && (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED)) {
 633                         DEBUG(1,("gensec_update ok but not accepted\n"));
 634                         nt_status = NT_STATUS_INVALID_PARAMETER;
 635                 }
 636
 637                 spnego_free_data(&spnego);
 638
 639                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 640                         /* compose reply */
 641                         spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
 642                         spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
 643                         spnego_out.negTokenTarg.supportedMech = NULL;
 644                         spnego_out.negTokenTarg.responseToken = unwrapped_out;
 645                         spnego_out.negTokenTarg.mechListMIC = null_data_blob;
 646
 647                         if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 648                                 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
 649                                 return NT_STATUS_INVALID_PARAMETER;
 650                         }
 651
 652                         spnego_state->state_position = SPNEGO_CLIENT_TARG;
 653                 } else if (NT_STATUS_IS_OK(nt_status)) {
 654                         /* all done - server has accepted, and we agree */
 655
 656                         if (unwrapped_out.length) {
 657                                 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
 658                                 spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
 659                                 spnego_out.negTokenTarg.supportedMech = NULL;
 660                                 spnego_out.negTokenTarg.responseToken = unwrapped_out;
 661                                 spnego_out.negTokenTarg.mechListMIC = null_data_blob;
 662
 663                                 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 664                                         DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
 665                                         return NT_STATUS_INVALID_PARAMETER;
 666                                 }
 667                         } else {
 668                                 *out = null_data_blob;
 669                         }
 670
 671                         spnego_state->state_position = SPNEGO_DONE;
 672                 } else {
 673                         DEBUG(1, ("SPNEGO(%s) login failed: %s\n",
 674                                   spnego_state->sub_sec_security->ops->name,
 675                                   nt_errstr(nt_status)));
 676                 }
 677                 return nt_status;
 678         }
 679         case SPNEGO_DONE:
 680                 return NT_STATUS_OK;
 681         }
 682         return NT_STATUS_INVALID_PARAMETER;
 683 }
 684
 685 static void gensec_spnego_end(struct gensec_security *gensec_security)
 686 {
 687         struct spnego_state *spnego_state = gensec_security->private_data;
 688
 689         if (spnego_state->sub_sec_security) {
 690                 gensec_end(&spnego_state->sub_sec_security);
 691         }
 692
 693         talloc_free(spnego_state);
 694
 695         gensec_security->private_data = NULL;
 696 }
 697
 698 static const struct gensec_security_ops gensec_spnego_security_ops = {
 699         .name           = "spnego",
 700         .sasl_name      = "GSS-SPNEGO",
 701         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
 702         .oid            = OID_SPNEGO,
 703         .client_start   = gensec_spnego_client_start,
 704         .server_start   = gensec_spnego_server_start,
 705         .update         = gensec_spnego_update,
 706         .seal_packet    = gensec_spnego_seal_packet,
 707         .sign_packet    = gensec_spnego_sign_packet,
 708         .sig_size       = gensec_spnego_sig_size,
 709         .check_packet   = gensec_spnego_check_packet,
 710         .unseal_packet  = gensec_spnego_unseal_packet,
 711         .session_key    = gensec_spnego_session_key,
 712         .session_info   = gensec_spnego_session_info,
 713         .end            = gensec_spnego_end
 714 };
 715
 716 NTSTATUS gensec_spnego_init(void)
 717 {
 718         NTSTATUS ret;
 719         ret = register_backend("gensec", &gensec_spnego_security_ops);
 720         if (!NT_STATUS_IS_OK(ret)) {
 721                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 722                         gensec_spnego_security_ops.name));
 723                 return ret;
 724         }
 725
 726         return ret;
 727 }