source/auth/gensec/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> 2004-2005
   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 #include "auth/auth.h"
  27
  28 enum spnego_state_position {
  29         SPNEGO_SERVER_START,
  30         SPNEGO_CLIENT_START,
  31         SPNEGO_SERVER_TARG,
  32         SPNEGO_CLIENT_TARG,
  33         SPNEGO_FALLBACK,
  34         SPNEGO_DONE
  35 };
  36
  37 struct spnego_state {
  38         uint_t ref_count;
  39         enum spnego_message_type expected_packet;
  40         enum spnego_state_position state_position;
  41         struct gensec_security *sub_sec_security;
  42         BOOL no_response_expected;
  43
  44         const char *neg_oid;
  45 };
  46
  47
  48 static NTSTATUS gensec_spnego_client_start(struct gensec_security *gensec_security)
  49 {
  50         struct spnego_state *spnego_state;
  51
  52         spnego_state = talloc(gensec_security, struct spnego_state);
  53         if (!spnego_state) {
  54                 return NT_STATUS_NO_MEMORY;
  55         }
  56
  57         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
  58         spnego_state->state_position = SPNEGO_CLIENT_START;
  59         spnego_state->sub_sec_security = NULL;
  60         spnego_state->no_response_expected = False;
  61
  62         gensec_security->private_data = spnego_state;
  63         return NT_STATUS_OK;
  64 }
  65
  66 static NTSTATUS gensec_spnego_server_start(struct gensec_security *gensec_security)
  67 {
  68         struct spnego_state *spnego_state;
  69
  70         spnego_state = talloc(gensec_security, struct spnego_state);
  71         if (!spnego_state) {
  72                 return NT_STATUS_NO_MEMORY;
  73         }
  74
  75         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
  76         spnego_state->state_position = SPNEGO_SERVER_START;
  77         spnego_state->sub_sec_security = NULL;
  78         spnego_state->no_response_expected = False;
  79
  80         gensec_security->private_data = spnego_state;
  81         return NT_STATUS_OK;
  82 }
  83
  84 /*
  85   wrappers for the spnego_*() functions
  86 */
  87 static NTSTATUS gensec_spnego_unseal_packet(struct gensec_security *gensec_security,
  88                                             TALLOC_CTX *mem_ctx,
  89                                             uint8_t *data, size_t length,
  90                                             const uint8_t *whole_pdu, size_t pdu_length,
  91                                             const DATA_BLOB *sig)
  92 {
  93         struct spnego_state *spnego_state = gensec_security->private_data;
  94
  95         if (spnego_state->state_position != SPNEGO_DONE
  96             && spnego_state->state_position != SPNEGO_FALLBACK) {
  97                 return NT_STATUS_INVALID_PARAMETER;
  98         }
  99
 100         return gensec_unseal_packet(spnego_state->sub_sec_security,
 101                                     mem_ctx,
 102                                     data, length,
 103                                     whole_pdu, pdu_length,
 104                                     sig);
 105 }
 106
 107 static NTSTATUS gensec_spnego_check_packet(struct gensec_security *gensec_security,
 108                                            TALLOC_CTX *mem_ctx,
 109                                            const uint8_t *data, size_t length,
 110                                            const uint8_t *whole_pdu, size_t pdu_length,
 111                                            const DATA_BLOB *sig)
 112 {
 113         struct spnego_state *spnego_state = gensec_security->private_data;
 114
 115         if (spnego_state->state_position != SPNEGO_DONE
 116             && spnego_state->state_position != SPNEGO_FALLBACK) {
 117                 return NT_STATUS_INVALID_PARAMETER;
 118         }
 119
 120         return gensec_check_packet(spnego_state->sub_sec_security,
 121                                    mem_ctx,
 122                                    data, length,
 123                                    whole_pdu, pdu_length,
 124                                    sig);
 125 }
 126
 127 static NTSTATUS gensec_spnego_seal_packet(struct gensec_security *gensec_security,
 128                                           TALLOC_CTX *mem_ctx,
 129                                           uint8_t *data, size_t length,
 130                                           const uint8_t *whole_pdu, size_t pdu_length,
 131                                           DATA_BLOB *sig)
 132 {
 133         struct spnego_state *spnego_state = gensec_security->private_data;
 134
 135         if (spnego_state->state_position != SPNEGO_DONE
 136             && spnego_state->state_position != SPNEGO_FALLBACK) {
 137                 return NT_STATUS_INVALID_PARAMETER;
 138         }
 139
 140         return gensec_seal_packet(spnego_state->sub_sec_security,
 141                                   mem_ctx,
 142                                   data, length,
 143                                   whole_pdu, pdu_length,
 144                                   sig);
 145 }
 146
 147 static NTSTATUS gensec_spnego_sign_packet(struct gensec_security *gensec_security,
 148                                           TALLOC_CTX *mem_ctx,
 149                                           const uint8_t *data, size_t length,
 150                                           const uint8_t *whole_pdu, size_t pdu_length,
 151                                           DATA_BLOB *sig)
 152 {
 153         struct spnego_state *spnego_state = gensec_security->private_data;
 154
 155         if (spnego_state->state_position != SPNEGO_DONE
 156             && spnego_state->state_position != SPNEGO_FALLBACK) {
 157                 return NT_STATUS_INVALID_PARAMETER;
 158         }
 159
 160         return gensec_sign_packet(spnego_state->sub_sec_security,
 161                                   mem_ctx,
 162                                   data, length,
 163                                   whole_pdu, pdu_length,
 164                                   sig);
 165 }
 166
 167 static NTSTATUS gensec_spnego_wrap(struct gensec_security *gensec_security,
 168                                    TALLOC_CTX *mem_ctx,
 169                                    const DATA_BLOB *in,
 170                                    DATA_BLOB *out)
 171 {
 172         struct spnego_state *spnego_state = gensec_security->private_data;
 173
 174         if (spnego_state->state_position != SPNEGO_DONE
 175             && spnego_state->state_position != SPNEGO_FALLBACK) {
 176                 DEBUG(1, ("gensec_spnego_wrap: wrong state for wrap\n"));
 177                 return NT_STATUS_INVALID_PARAMETER;
 178         }
 179
 180         return gensec_wrap(spnego_state->sub_sec_security,
 181                            mem_ctx, in, out);
 182 }
 183
 184 static NTSTATUS gensec_spnego_unwrap(struct gensec_security *gensec_security,
 185                                      TALLOC_CTX *mem_ctx,
 186                                      const DATA_BLOB *in,
 187                                      DATA_BLOB *out)
 188 {
 189         struct spnego_state *spnego_state = gensec_security->private_data;
 190
 191         if (spnego_state->state_position != SPNEGO_DONE
 192             && spnego_state->state_position != SPNEGO_FALLBACK) {
 193                 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
 194                 return NT_STATUS_INVALID_PARAMETER;
 195         }
 196
 197         return gensec_unwrap(spnego_state->sub_sec_security,
 198                              mem_ctx, in, out);
 199 }
 200
 201 static size_t gensec_spnego_sig_size(struct gensec_security *gensec_security)
 202 {
 203         struct spnego_state *spnego_state = gensec_security->private_data;
 204
 205         if (spnego_state->state_position != SPNEGO_DONE
 206             && spnego_state->state_position != SPNEGO_FALLBACK) {
 207                 return 0;
 208         }
 209
 210         return gensec_sig_size(spnego_state->sub_sec_security);
 211 }
 212
 213 static NTSTATUS gensec_spnego_session_key(struct gensec_security *gensec_security,
 214                                           DATA_BLOB *session_key)
 215 {
 216         struct spnego_state *spnego_state = gensec_security->private_data;
 217         if (!spnego_state->sub_sec_security) {
 218                 return NT_STATUS_INVALID_PARAMETER;
 219         }
 220
 221         return gensec_session_key(spnego_state->sub_sec_security,
 222                                   session_key);
 223 }
 224
 225 static NTSTATUS gensec_spnego_session_info(struct gensec_security *gensec_security,
 226                                                                       struct auth_session_info **session_info)
 227 {
 228         struct spnego_state *spnego_state = gensec_security->private_data;
 229         if (!spnego_state->sub_sec_security) {
 230                 return NT_STATUS_INVALID_PARAMETER;
 231         }
 232
 233         return gensec_session_info(spnego_state->sub_sec_security,
 234                                    session_info);
 235 }
 236
 237 /** Fallback to another GENSEC mechanism, based on magic strings
 238  *
 239  * This is the 'fallback' case, where we don't get SPNEGO, and have to
 240  * try all the other options (and hope they all have a magic string
 241  * they check)
 242 */
 243
 244 static NTSTATUS gensec_spnego_server_try_fallback(struct gensec_security *gensec_security,
 245                                                   struct spnego_state *spnego_state,
 246                                                   TALLOC_CTX *out_mem_ctx,
 247                                                   const DATA_BLOB in, DATA_BLOB *out)
 248 {
 249         int i,j;
 250         int num_ops;
 251         const struct gensec_security_ops **all_ops = gensec_security_all(&num_ops);
 252         for (i=0; i < num_ops; i++) {
 253                 BOOL is_spnego;
 254                 NTSTATUS nt_status;
 255                 if (!all_ops[i]->oid) {
 256                         continue;
 257                 }
 258
 259                 is_spnego = False;
 260                 for (j=0; all_ops[i]->oid[j]; j++) {
 261                         if (strcasecmp(GENSEC_OID_SPNEGO,all_ops[i]->oid[j]) == 0) {
 262                                 is_spnego = True;
 263                         }
 264                 }
 265                 if (is_spnego) {
 266                         continue;
 267                 }
 268
 269                 if (!all_ops[i]->magic) {
 270                         continue;
 271                 }
 272
 273                 nt_status = all_ops[i]->magic(gensec_security, &in);
 274                 if (!NT_STATUS_IS_OK(nt_status)) {
 275                         continue;
 276                 }
 277
 278                 spnego_state->state_position = SPNEGO_FALLBACK;
 279
 280                 nt_status = gensec_subcontext_start(spnego_state,
 281                                                     gensec_security,
 282                                                     &spnego_state->sub_sec_security);
 283
 284                 if (!NT_STATUS_IS_OK(nt_status)) {
 285                         return nt_status;
 286                 }
 287                 /* select the sub context */
 288                 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
 289                                                      all_ops[i]);
 290                 if (!NT_STATUS_IS_OK(nt_status)) {
 291                         return nt_status;
 292                 }
 293                 nt_status = gensec_update(spnego_state->sub_sec_security,
 294                                           out_mem_ctx, in, out);
 295                 return nt_status;
 296         }
 297         DEBUG(1, ("Failed to parse SPNEGO request\n"));
 298         return NT_STATUS_INVALID_PARAMETER;
 299
 300 }
 301
 302 /*
 303    Parse the netTokenInit, either from the client, to the server, or
 304    from the server to the client.
 305 */
 306
 307 static NTSTATUS gensec_spnego_parse_negTokenInit(struct gensec_security *gensec_security,
 308                                                  struct spnego_state *spnego_state,
 309                                                  TALLOC_CTX *out_mem_ctx,
 310                                                  const char **mechType,
 311                                                  const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out)
 312 {
 313         int i;
 314         NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
 315         DATA_BLOB null_data_blob = data_blob(NULL,0);
 316
 317         const struct gensec_security_ops_wrapper *all_sec
 318                 = gensec_security_by_oid_list(out_mem_ctx,
 319                                               mechType,
 320                                               GENSEC_OID_SPNEGO);
 321         for (i=0; all_sec && all_sec[i].op; i++) {
 322                 nt_status = gensec_subcontext_start(spnego_state,
 323                                                     gensec_security,
 324                                                     &spnego_state->sub_sec_security);
 325                 if (!NT_STATUS_IS_OK(nt_status)) {
 326                         return nt_status;
 327                 }
 328                 /* select the sub context */
 329                 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
 330                                                      all_sec[i].op);
 331                 if (!NT_STATUS_IS_OK(nt_status)) {
 332                         talloc_free(spnego_state->sub_sec_security);
 333                         spnego_state->sub_sec_security = NULL;
 334                         continue;
 335                 }
 336
 337                 if ((i == 0) && (strcmp(all_sec[0].oid, mechType[0]) == 0)) {
 338                         nt_status = gensec_update(spnego_state->sub_sec_security,
 339                                                   out_mem_ctx,
 340                                                   unwrapped_in,
 341                                                   unwrapped_out);
 342                 } else {
 343                         /* only get the helping start blob for the first OID */
 344                         nt_status = gensec_update(spnego_state->sub_sec_security,
 345                                                   out_mem_ctx,
 346                                                   null_data_blob,
 347                                                   unwrapped_out);
 348                         /* it is likely that a NULL input token will
 349                          * not be liked by most mechs, so just push us
 350                          * along the merry-go-round again, and hope
 351                          * for better luck next time */
 352
 353                         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)) {
 354                                 *unwrapped_out = data_blob(NULL, 0);
 355                                 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 356                         }
 357                 }
 358
 359                 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)
 360                     && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
 361                     && !NT_STATUS_IS_OK(nt_status)) {
 362                         DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
 363                                   spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
 364                         talloc_free(spnego_state->sub_sec_security);
 365                         spnego_state->sub_sec_security = NULL;
 366
 367                         /* We started the mech correctly, and the
 368                          * input from the other side was valid.
 369                          * Return the error (say bad password, invalid
 370                          * ticket) */
 371                         return nt_status;
 372
 373                 } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)) {
 374                         /* Pretend we never started it (lets the first run find some incompatible demand) */
 375
 376                         DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse: %s\n",
 377                                   spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
 378                         talloc_free(spnego_state->sub_sec_security);
 379                         spnego_state->sub_sec_security = NULL;
 380                         continue;
 381                 }
 382
 383                 spnego_state->neg_oid = all_sec[i].oid;
 384
 385                 return nt_status; /* OK, INVALID_PARAMETER ore MORE PROCESSING */
 386         }
 387
 388         DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
 389         /* we could re-negotiate here, but it would only work
 390          * if the client or server lied about what it could
 391          * support the first time.  Lets keep this code to
 392          * reality */
 393
 394         return NT_STATUS_INVALID_PARAMETER;
 395 }
 396
 397 /** create a negTokenInit
 398  *
 399  * This is the same packet, no matter if the client or server sends it first, but it is always the first packet
 400 */
 401 static NTSTATUS gensec_spnego_create_negTokenInit(struct gensec_security *gensec_security,
 402                                                   struct spnego_state *spnego_state,
 403                                                   TALLOC_CTX *out_mem_ctx,
 404                                                   const DATA_BLOB in, DATA_BLOB *out)
 405 {
 406         int i;
 407         NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
 408         DATA_BLOB null_data_blob = data_blob(NULL,0);
 409         const char **mechTypes = NULL;
 410         DATA_BLOB unwrapped_out = data_blob(NULL, 0);
 411         const struct gensec_security_ops_wrapper *all_sec;
 412
 413         mechTypes = gensec_security_oids(out_mem_ctx, GENSEC_OID_SPNEGO);
 414
 415         all_sec = gensec_security_by_oid_list(out_mem_ctx,
 416                                               mechTypes,
 417                                               GENSEC_OID_SPNEGO);
 418         for (i=0; all_sec && all_sec[i].op; i++) {
 419                 struct spnego_data spnego_out;
 420                 nt_status = gensec_subcontext_start(spnego_state,
 421                                                     gensec_security,
 422                                                     &spnego_state->sub_sec_security);
 423                 if (!NT_STATUS_IS_OK(nt_status)) {
 424                         return nt_status;
 425                 }
 426                 /* select the sub context */
 427                 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
 428                                                      all_sec[i].op);
 429                 if (!NT_STATUS_IS_OK(nt_status)) {
 430                         talloc_free(spnego_state->sub_sec_security);
 431                         spnego_state->sub_sec_security = NULL;
 432                         continue;
 433                 }
 434
 435                 /* In the client, try and produce the first (optimistic) packet */
 436                 if (spnego_state->state_position == SPNEGO_CLIENT_START) {
 437                         nt_status = gensec_update(spnego_state->sub_sec_security,
 438                                                   out_mem_ctx,
 439                                                   null_data_blob,
 440                                                   &unwrapped_out);
 441
 442                         if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
 443                             && !NT_STATUS_IS_OK(nt_status)) {
 444                                 DEBUG(1, ("SPNEGO(%s) creating NEG_TOKEN_INIT failed: %s\n",
 445                                           spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
 446                                 talloc_free(spnego_state->sub_sec_security);
 447                                 spnego_state->sub_sec_security = NULL;
 448                                 /* Pretend we never started it (lets the first run find some incompatible demand) */
 449
 450                                 continue;
 451                         }
 452                 }
 453
 454                 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
 455
 456                 /* List the remaining mechs as options */
 457                 spnego_out.negTokenInit.mechTypes = gensec_security_oids_from_ops_wrapped(out_mem_ctx,
 458                                                                                           &all_sec[i]);
 459                 spnego_out.negTokenInit.reqFlags = 0;
 460
 461                 if (spnego_state->state_position == SPNEGO_SERVER_START) {
 462                         spnego_out.negTokenInit.mechListMIC
 463                                 = data_blob_string_const(talloc_asprintf(out_mem_ctx, "%s$@%s", lp_netbios_name(), lp_realm()));
 464                 } else {
 465                         spnego_out.negTokenInit.mechListMIC = null_data_blob;
 466                 }
 467                 spnego_out.negTokenInit.mechToken = unwrapped_out;
 468
 469                 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 470                         DEBUG(1, ("Failed to write NEG_TOKEN_INIT\n"));
 471                                 return NT_STATUS_INVALID_PARAMETER;
 472                 }
 473
 474                 /* set next state */
 475                 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 476
 477                 if (NT_STATUS_IS_OK(nt_status)) {
 478                         spnego_state->no_response_expected = True;
 479                 }
 480
 481                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 482         }
 483         talloc_free(spnego_state->sub_sec_security);
 484         spnego_state->sub_sec_security = NULL;
 485
 486         DEBUG(1, ("Failed to setup SPNEGO negTokenInit request: %s\n", nt_errstr(nt_status)));
 487         return NT_STATUS_INVALID_PARAMETER;
 488 }
 489
 490
 491 /** create a client negTokenTarg
 492  *
 493  * This is the case, where the client is the first one who sends data
 494 */
 495
 496 static NTSTATUS gensec_spnego_server_negTokenTarg(struct gensec_security *gensec_security,
 497                                                   struct spnego_state *spnego_state,
 498                                                   TALLOC_CTX *out_mem_ctx,
 499                                                   NTSTATUS nt_status,
 500                                                   const DATA_BLOB unwrapped_out, DATA_BLOB *out)
 501 {
 502         struct spnego_data spnego_out;
 503         DATA_BLOB null_data_blob = data_blob(NULL, 0);
 504
 505         /* compose reply */
 506         spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
 507         spnego_out.negTokenTarg.responseToken = unwrapped_out;
 508         spnego_out.negTokenTarg.mechListMIC = null_data_blob;
 509         spnego_out.negTokenTarg.supportedMech = NULL;
 510
 511         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 512                 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
 513                 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
 514                 spnego_state->state_position = SPNEGO_SERVER_TARG;
 515         } else if (NT_STATUS_IS_OK(nt_status)) {
 516                 if (unwrapped_out.data) {
 517                         spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
 518                 }
 519                 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
 520                 spnego_state->state_position = SPNEGO_DONE;
 521         } else {
 522                 spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
 523                 DEBUG(2, ("SPNEGO login failed: %s\n", nt_errstr(nt_status)));
 524                 spnego_state->state_position = SPNEGO_DONE;
 525         }
 526
 527         if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 528                 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
 529                 return NT_STATUS_INVALID_PARAMETER;
 530         }
 531
 532         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 533
 534         return nt_status;
 535 }
 536
 537
 538 static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
 539                                      const DATA_BLOB in, DATA_BLOB *out)
 540 {
 541         struct spnego_state *spnego_state = gensec_security->private_data;
 542         DATA_BLOB null_data_blob = data_blob(NULL, 0);
 543         DATA_BLOB unwrapped_out = data_blob(NULL, 0);
 544         struct spnego_data spnego_out;
 545         struct spnego_data spnego;
 546
 547         ssize_t len;
 548
 549         *out = data_blob(NULL, 0);
 550
 551         if (!out_mem_ctx) {
 552                 out_mem_ctx = spnego_state;
 553         }
 554
 555         /* and switch into the state machine */
 556
 557         switch (spnego_state->state_position) {
 558         case SPNEGO_FALLBACK:
 559                 return gensec_update(spnego_state->sub_sec_security,
 560                                      out_mem_ctx, in, out);
 561         case SPNEGO_SERVER_START:
 562         {
 563                 NTSTATUS nt_status;
 564                 if (in.length) {
 565
 566                         len = spnego_read_data(in, &spnego);
 567                         if (len == -1) {
 568                                 return gensec_spnego_server_try_fallback(gensec_security, spnego_state, out_mem_ctx, in, out);
 569                         }
 570                         /* client sent NegTargetInit, we send NegTokenTarg */
 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, in.data, in.length);
 577                                 spnego_free_data(&spnego);
 578                                 return NT_STATUS_INVALID_PARAMETER;
 579                         }
 580
 581                         nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
 582                                                                      spnego_state,
 583                                                                      out_mem_ctx,
 584                                                                      spnego.negTokenInit.mechTypes,
 585                                                                      spnego.negTokenInit.mechToken,
 586                                                                      &unwrapped_out);
 587
 588                         nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
 589                                                                       spnego_state,
 590                                                                       out_mem_ctx,
 591                                                                       nt_status,
 592                                                                       unwrapped_out,
 593                                                                       out);
 594
 595                         spnego_free_data(&spnego);
 596
 597                         return nt_status;
 598                 } else {
 599                         nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
 600                                                                  out_mem_ctx, in, out);
 601                         spnego_state->state_position = SPNEGO_SERVER_TARG;
 602                         return nt_status;
 603                 }
 604         }
 605
 606         case SPNEGO_CLIENT_START:
 607         {
 608                 /* The server offers a list of mechanisms */
 609
 610                 const char *my_mechs[] = {NULL, NULL};
 611                 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
 612
 613                 if (!in.length) {
 614                         /* client to produce negTokenInit */
 615                         nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
 616                                                                  out_mem_ctx, in, out);
 617                         spnego_state->state_position = SPNEGO_CLIENT_TARG;
 618                         return nt_status;
 619                 }
 620
 621                 len = spnego_read_data(in, &spnego);
 622
 623                 if (len == -1) {
 624                         DEBUG(1, ("Invalid SPNEGO request:\n"));
 625                         dump_data(1, in.data, in.length);
 626                         return NT_STATUS_INVALID_PARAMETER;
 627                 }
 628
 629                 /* OK, so it's real SPNEGO, check the packet's the one we expect */
 630                 if (spnego.type != spnego_state->expected_packet) {
 631                         DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 632                                   spnego_state->expected_packet));
 633                         dump_data(1, in.data, in.length);
 634                         spnego_free_data(&spnego);
 635                         return NT_STATUS_INVALID_PARAMETER;
 636                 }
 637
 638                 if (spnego.negTokenInit.targetPrincipal) {
 639                         DEBUG(5, ("Server claims it's principal name is %s (ignored)\n", spnego.negTokenInit.targetPrincipal));
 640                 }
 641
 642                 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
 643                                                              spnego_state,
 644                                                              out_mem_ctx,
 645                                                              spnego.negTokenInit.mechTypes,
 646                                                              spnego.negTokenInit.mechToken,
 647                                                              &unwrapped_out);
 648
 649                 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
 650                         spnego_free_data(&spnego);
 651                         return nt_status;
 652                 }
 653
 654                 my_mechs[0] = spnego_state->neg_oid;
 655                 /* compose reply */
 656                 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
 657                 spnego_out.negTokenInit.mechTypes = my_mechs;
 658                 spnego_out.negTokenInit.reqFlags = 0;
 659                 spnego_out.negTokenInit.mechListMIC = null_data_blob;
 660                 spnego_out.negTokenInit.mechToken = unwrapped_out;
 661
 662                 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 663                         DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
 664                                 return NT_STATUS_INVALID_PARAMETER;
 665                 }
 666
 667                 /* set next state */
 668                 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 669                 spnego_state->state_position = SPNEGO_CLIENT_TARG;
 670
 671                 if (NT_STATUS_IS_OK(nt_status)) {
 672                         spnego_state->no_response_expected = True;
 673                 }
 674
 675                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 676         }
 677         case SPNEGO_SERVER_TARG:
 678         {
 679                 NTSTATUS nt_status;
 680                 if (!in.length) {
 681                         return NT_STATUS_INVALID_PARAMETER;
 682                 }
 683
 684                 len = spnego_read_data(in, &spnego);
 685
 686                 if (len == -1) {
 687                         DEBUG(1, ("Invalid SPNEGO request:\n"));
 688                         dump_data(1, in.data, in.length);
 689                         return NT_STATUS_INVALID_PARAMETER;
 690                 }
 691
 692                 /* OK, so it's real SPNEGO, check the packet's the one we expect */
 693                 if (spnego.type != spnego_state->expected_packet) {
 694                         DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 695                                   spnego_state->expected_packet));
 696                         dump_data(1, in.data, in.length);
 697                         spnego_free_data(&spnego);
 698                         return NT_STATUS_INVALID_PARAMETER;
 699                 }
 700
 701                 if (!spnego_state->sub_sec_security) {
 702                         DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
 703                         return NT_STATUS_INVALID_PARAMETER;
 704                 }
 705
 706                 nt_status = gensec_update(spnego_state->sub_sec_security,
 707                                           out_mem_ctx,
 708                                           spnego.negTokenTarg.responseToken,
 709                                           &unwrapped_out);
 710
 711                 nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
 712                                                               spnego_state,
 713                                                               out_mem_ctx,
 714                                                               nt_status,
 715                                                               unwrapped_out,
 716                                                               out);
 717
 718                 spnego_free_data(&spnego);
 719
 720                 return nt_status;
 721         }
 722         case SPNEGO_CLIENT_TARG:
 723         {
 724                 NTSTATUS nt_status;
 725                 if (!in.length) {
 726                         return NT_STATUS_INVALID_PARAMETER;
 727                 }
 728
 729                 len = spnego_read_data(in, &spnego);
 730
 731                 if (len == -1) {
 732                         DEBUG(1, ("Invalid SPNEGO request:\n"));
 733                         dump_data(1, in.data, in.length);
 734                         return NT_STATUS_INVALID_PARAMETER;
 735                 }
 736
 737                 /* OK, so it's real SPNEGO, check the packet's the one we expect */
 738                 if (spnego.type != spnego_state->expected_packet) {
 739                         DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 740                                   spnego_state->expected_packet));
 741                         dump_data(1, in.data, in.length);
 742                         spnego_free_data(&spnego);
 743                         return NT_STATUS_INVALID_PARAMETER;
 744                 }
 745
 746                 if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
 747                         return NT_STATUS_ACCESS_DENIED;
 748                 }
 749
 750                 if (spnego_state->no_response_expected) {
 751                         if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
 752                                 DEBUG(3,("GENSEC SPNEGO: client GENSEC accepted, but server rejected (bad password?)\n"));
 753                                 nt_status = NT_STATUS_INVALID_PARAMETER;
 754                         } else if (spnego.negTokenTarg.responseToken.length) {
 755                                 DEBUG(2,("GENSEC SPNEGO: client GENSEC accepted, but server continued negotiation!\n"));
 756                                 nt_status = NT_STATUS_INVALID_PARAMETER;
 757                         } else {
 758                                 nt_status = NT_STATUS_OK;
 759                         }
 760                 } else {
 761                         nt_status = gensec_update(spnego_state->sub_sec_security,
 762                                                   out_mem_ctx,
 763                                                   spnego.negTokenTarg.responseToken,
 764                                                   &unwrapped_out);
 765
 766                         if (NT_STATUS_IS_OK(nt_status)) {
 767                                 spnego_state->no_response_expected = True;
 768                         }
 769                 }
 770
 771                 spnego_free_data(&spnego);
 772
 773                 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
 774                         && !NT_STATUS_IS_OK(nt_status)) {
 775                         DEBUG(1, ("SPNEGO(%s) login failed: %s\n",
 776                                   spnego_state->sub_sec_security->ops->name,
 777                                   nt_errstr(nt_status)));
 778                         return nt_status;
 779                 }
 780
 781                 if (unwrapped_out.length) {
 782                         /* compose reply */
 783                         spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
 784                         spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
 785                         spnego_out.negTokenTarg.supportedMech = NULL;
 786                         spnego_out.negTokenTarg.responseToken = unwrapped_out;
 787                         spnego_out.negTokenTarg.mechListMIC = null_data_blob;
 788
 789                         if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 790                                 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
 791                                 return NT_STATUS_INVALID_PARAMETER;
 792                         }
 793
 794                         spnego_state->state_position = SPNEGO_CLIENT_TARG;
 795                         nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 796                 } else {
 797
 798                         /* all done - server has accepted, and we agree */
 799                         *out = null_data_blob;
 800
 801                         if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
 802                                 /* unless of course it did not accept */
 803                                 DEBUG(1,("gensec_update ok but not accepted\n"));
 804                                 nt_status = NT_STATUS_INVALID_PARAMETER;
 805                         }
 806                 }
 807
 808                 spnego_state->state_position = SPNEGO_DONE;
 809
 810                 return nt_status;
 811         }
 812         case SPNEGO_DONE:
 813                 return NT_STATUS_OK;
 814         }
 815         return NT_STATUS_INVALID_PARAMETER;
 816 }
 817
 818 static BOOL gensec_spnego_have_feature(struct gensec_security *gensec_security,
 819                                        uint32_t feature)
 820 {
 821         struct spnego_state *spnego_state = gensec_security->private_data;
 822         if (!spnego_state->sub_sec_security) {
 823                 return False;
 824         }
 825
 826         return gensec_have_feature(spnego_state->sub_sec_security,
 827                                    feature);
 828 }
 829
 830 static const char *gensec_spnego_oids[] = {
 831         GENSEC_OID_SPNEGO,
 832         NULL
 833 };
 834
 835 static const struct gensec_security_ops gensec_spnego_security_ops = {
 836         .name           = "spnego",
 837         .sasl_name      = "GSS-SPNEGO",
 838         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
 839         .oid            = gensec_spnego_oids,
 840         .client_start   = gensec_spnego_client_start,
 841         .server_start   = gensec_spnego_server_start,
 842         .update         = gensec_spnego_update,
 843         .seal_packet    = gensec_spnego_seal_packet,
 844         .sign_packet    = gensec_spnego_sign_packet,
 845         .sig_size       = gensec_spnego_sig_size,
 846         .check_packet   = gensec_spnego_check_packet,
 847         .unseal_packet  = gensec_spnego_unseal_packet,
 848         .wrap           = gensec_spnego_wrap,
 849         .unwrap         = gensec_spnego_unwrap,
 850         .session_key    = gensec_spnego_session_key,
 851         .session_info   = gensec_spnego_session_info,
 852         .have_feature   = gensec_spnego_have_feature,
 853         .enabled        = True
 854 };
 855
 856 NTSTATUS gensec_spnego_init(void)
 857 {
 858         NTSTATUS ret;
 859         ret = gensec_register(&gensec_spnego_security_ops);
 860         if (!NT_STATUS_IS_OK(ret)) {
 861                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 862                         gensec_spnego_security_ops.name));
 863                 return ret;
 864         }
 865
 866         return ret;
 867 }