source4/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    Copyright (C) Stefan Metzmacher <metze@samba.org>  2004-2008
   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
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "../libcli/auth/spnego.h"
  27 #include "librpc/gen_ndr/ndr_dcerpc.h"
  28 #include "auth/credentials/credentials.h"
  29 #include "auth/gensec/gensec.h"
  30 #include "auth/gensec/gensec_proto.h"
  31 #include "param/param.h"
  32
  33 enum spnego_state_position {
  34         SPNEGO_SERVER_START,
  35         SPNEGO_CLIENT_START,
  36         SPNEGO_SERVER_TARG,
  37         SPNEGO_CLIENT_TARG,
  38         SPNEGO_FALLBACK,
  39         SPNEGO_DONE
  40 };
  41
  42 struct spnego_state {
  43         enum spnego_message_type expected_packet;
  44         enum spnego_state_position state_position;
  45         struct gensec_security *sub_sec_security;
  46         bool no_response_expected;
  47
  48         const char *neg_oid;
  49
  50         DATA_BLOB mech_types;
  51 };
  52
  53
  54 static NTSTATUS gensec_spnego_client_start(struct gensec_security *gensec_security)
  55 {
  56         struct spnego_state *spnego_state;
  57
  58         spnego_state = talloc(gensec_security, struct spnego_state);
  59         if (!spnego_state) {
  60                 return NT_STATUS_NO_MEMORY;
  61         }
  62
  63         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
  64         spnego_state->state_position = SPNEGO_CLIENT_START;
  65         spnego_state->sub_sec_security = NULL;
  66         spnego_state->no_response_expected = false;
  67         spnego_state->mech_types = data_blob(NULL, 0);
  68
  69         gensec_security->private_data = spnego_state;
  70         return NT_STATUS_OK;
  71 }
  72
  73 static NTSTATUS gensec_spnego_server_start(struct gensec_security *gensec_security)
  74 {
  75         struct spnego_state *spnego_state;
  76
  77         spnego_state = talloc(gensec_security, struct spnego_state);
  78         if (!spnego_state) {
  79                 return NT_STATUS_NO_MEMORY;
  80         }
  81
  82         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
  83         spnego_state->state_position = SPNEGO_SERVER_START;
  84         spnego_state->sub_sec_security = NULL;
  85         spnego_state->no_response_expected = false;
  86         spnego_state->mech_types = data_blob(NULL, 0);
  87
  88         gensec_security->private_data = spnego_state;
  89         return NT_STATUS_OK;
  90 }
  91
  92 /*
  93   wrappers for the spnego_*() functions
  94 */
  95 static NTSTATUS gensec_spnego_unseal_packet(struct gensec_security *gensec_security,
  96                                             TALLOC_CTX *mem_ctx,
  97                                             uint8_t *data, size_t length,
  98                                             const uint8_t *whole_pdu, size_t pdu_length,
  99                                             const DATA_BLOB *sig)
 100 {
 101         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 102
 103         if (spnego_state->state_position != SPNEGO_DONE
 104             && spnego_state->state_position != SPNEGO_FALLBACK) {
 105                 return NT_STATUS_INVALID_PARAMETER;
 106         }
 107
 108         return gensec_unseal_packet(spnego_state->sub_sec_security,
 109                                     mem_ctx,
 110                                     data, length,
 111                                     whole_pdu, pdu_length,
 112                                     sig);
 113 }
 114
 115 static NTSTATUS gensec_spnego_check_packet(struct gensec_security *gensec_security,
 116                                            TALLOC_CTX *mem_ctx,
 117                                            const uint8_t *data, size_t length,
 118                                            const uint8_t *whole_pdu, size_t pdu_length,
 119                                            const DATA_BLOB *sig)
 120 {
 121         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 122
 123         if (spnego_state->state_position != SPNEGO_DONE
 124             && spnego_state->state_position != SPNEGO_FALLBACK) {
 125                 return NT_STATUS_INVALID_PARAMETER;
 126         }
 127
 128         return gensec_check_packet(spnego_state->sub_sec_security,
 129                                    mem_ctx,
 130                                    data, length,
 131                                    whole_pdu, pdu_length,
 132                                    sig);
 133 }
 134
 135 static NTSTATUS gensec_spnego_seal_packet(struct gensec_security *gensec_security,
 136                                           TALLOC_CTX *mem_ctx,
 137                                           uint8_t *data, size_t length,
 138                                           const uint8_t *whole_pdu, size_t pdu_length,
 139                                           DATA_BLOB *sig)
 140 {
 141         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 142
 143         if (spnego_state->state_position != SPNEGO_DONE
 144             && spnego_state->state_position != SPNEGO_FALLBACK) {
 145                 return NT_STATUS_INVALID_PARAMETER;
 146         }
 147
 148         return gensec_seal_packet(spnego_state->sub_sec_security,
 149                                   mem_ctx,
 150                                   data, length,
 151                                   whole_pdu, pdu_length,
 152                                   sig);
 153 }
 154
 155 static NTSTATUS gensec_spnego_sign_packet(struct gensec_security *gensec_security,
 156                                           TALLOC_CTX *mem_ctx,
 157                                           const uint8_t *data, size_t length,
 158                                           const uint8_t *whole_pdu, size_t pdu_length,
 159                                           DATA_BLOB *sig)
 160 {
 161         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 162
 163         if (spnego_state->state_position != SPNEGO_DONE
 164             && spnego_state->state_position != SPNEGO_FALLBACK) {
 165                 return NT_STATUS_INVALID_PARAMETER;
 166         }
 167
 168         return gensec_sign_packet(spnego_state->sub_sec_security,
 169                                   mem_ctx,
 170                                   data, length,
 171                                   whole_pdu, pdu_length,
 172                                   sig);
 173 }
 174
 175 static NTSTATUS gensec_spnego_wrap(struct gensec_security *gensec_security,
 176                                    TALLOC_CTX *mem_ctx,
 177                                    const DATA_BLOB *in,
 178                                    DATA_BLOB *out)
 179 {
 180         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 181
 182         if (spnego_state->state_position != SPNEGO_DONE
 183             && spnego_state->state_position != SPNEGO_FALLBACK) {
 184                 DEBUG(1, ("gensec_spnego_wrap: wrong state for wrap\n"));
 185                 return NT_STATUS_INVALID_PARAMETER;
 186         }
 187
 188         return gensec_wrap(spnego_state->sub_sec_security,
 189                            mem_ctx, in, out);
 190 }
 191
 192 static NTSTATUS gensec_spnego_unwrap(struct gensec_security *gensec_security,
 193                                      TALLOC_CTX *mem_ctx,
 194                                      const DATA_BLOB *in,
 195                                      DATA_BLOB *out)
 196 {
 197         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 198
 199         if (spnego_state->state_position != SPNEGO_DONE
 200             && spnego_state->state_position != SPNEGO_FALLBACK) {
 201                 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
 202                 return NT_STATUS_INVALID_PARAMETER;
 203         }
 204
 205         return gensec_unwrap(spnego_state->sub_sec_security,
 206                              mem_ctx, in, out);
 207 }
 208
 209 static NTSTATUS gensec_spnego_wrap_packets(struct gensec_security *gensec_security,
 210                                            TALLOC_CTX *mem_ctx,
 211                                            const DATA_BLOB *in,
 212                                            DATA_BLOB *out,
 213                                            size_t *len_processed)
 214 {
 215         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 216
 217         if (spnego_state->state_position != SPNEGO_DONE
 218             && spnego_state->state_position != SPNEGO_FALLBACK) {
 219                 DEBUG(1, ("gensec_spnego_wrap: wrong state for wrap\n"));
 220                 return NT_STATUS_INVALID_PARAMETER;
 221         }
 222
 223         return gensec_wrap_packets(spnego_state->sub_sec_security,
 224                                    mem_ctx, in, out,
 225                                    len_processed);
 226 }
 227
 228 static NTSTATUS gensec_spnego_packet_full_request(struct gensec_security *gensec_security,
 229                                                 DATA_BLOB blob, size_t *size)
 230 {
 231         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 232
 233         if (spnego_state->state_position != SPNEGO_DONE
 234             && spnego_state->state_position != SPNEGO_FALLBACK) {
 235                 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
 236                 return NT_STATUS_INVALID_PARAMETER;
 237         }
 238
 239         return gensec_packet_full_request(spnego_state->sub_sec_security,
 240                                           blob, size);
 241 }
 242
 243 static NTSTATUS gensec_spnego_unwrap_packets(struct gensec_security *gensec_security,
 244                                              TALLOC_CTX *mem_ctx,
 245                                              const DATA_BLOB *in,
 246                                              DATA_BLOB *out,
 247                                              size_t *len_processed)
 248 {
 249         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 250
 251         if (spnego_state->state_position != SPNEGO_DONE
 252             && spnego_state->state_position != SPNEGO_FALLBACK) {
 253                 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
 254                 return NT_STATUS_INVALID_PARAMETER;
 255         }
 256
 257         return gensec_unwrap_packets(spnego_state->sub_sec_security,
 258                                      mem_ctx, in, out,
 259                                      len_processed);
 260 }
 261
 262 static size_t gensec_spnego_sig_size(struct gensec_security *gensec_security, size_t data_size)
 263 {
 264         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 265
 266         if (spnego_state->state_position != SPNEGO_DONE
 267             && spnego_state->state_position != SPNEGO_FALLBACK) {
 268                 return 0;
 269         }
 270
 271         return gensec_sig_size(spnego_state->sub_sec_security, data_size);
 272 }
 273
 274 static size_t gensec_spnego_max_input_size(struct gensec_security *gensec_security)
 275 {
 276         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 277
 278         if (spnego_state->state_position != SPNEGO_DONE
 279             && spnego_state->state_position != SPNEGO_FALLBACK) {
 280                 return 0;
 281         }
 282
 283         return gensec_max_input_size(spnego_state->sub_sec_security);
 284 }
 285
 286 static size_t gensec_spnego_max_wrapped_size(struct gensec_security *gensec_security)
 287 {
 288         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 289
 290         if (spnego_state->state_position != SPNEGO_DONE
 291             && spnego_state->state_position != SPNEGO_FALLBACK) {
 292                 return 0;
 293         }
 294
 295         return gensec_max_wrapped_size(spnego_state->sub_sec_security);
 296 }
 297
 298 static NTSTATUS gensec_spnego_session_key(struct gensec_security *gensec_security,
 299                                           DATA_BLOB *session_key)
 300 {
 301         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 302         if (!spnego_state->sub_sec_security) {
 303                 return NT_STATUS_INVALID_PARAMETER;
 304         }
 305
 306         return gensec_session_key(spnego_state->sub_sec_security,
 307                                   session_key);
 308 }
 309
 310 static NTSTATUS gensec_spnego_session_info(struct gensec_security *gensec_security,
 311                                                                       struct auth_session_info **session_info)
 312 {
 313         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 314         if (!spnego_state->sub_sec_security) {
 315                 return NT_STATUS_INVALID_PARAMETER;
 316         }
 317
 318         return gensec_session_info(spnego_state->sub_sec_security,
 319                                    session_info);
 320 }
 321
 322 /** Fallback to another GENSEC mechanism, based on magic strings
 323  *
 324  * This is the 'fallback' case, where we don't get SPNEGO, and have to
 325  * try all the other options (and hope they all have a magic string
 326  * they check)
 327 */
 328
 329 static NTSTATUS gensec_spnego_server_try_fallback(struct gensec_security *gensec_security,
 330                                                   struct spnego_state *spnego_state,
 331                                                   TALLOC_CTX *out_mem_ctx,
 332                                                   const DATA_BLOB in, DATA_BLOB *out)
 333 {
 334         int i,j;
 335         struct gensec_security_ops **all_ops
 336                 = gensec_security_mechs(gensec_security, out_mem_ctx);
 337         for (i=0; all_ops[i]; i++) {
 338                 bool is_spnego;
 339                 NTSTATUS nt_status;
 340
 341                 if (gensec_security != NULL &&
 342                                 !gensec_security_ops_enabled(all_ops[i], gensec_security))
 343                     continue;
 344
 345                 if (!all_ops[i]->oid) {
 346                         continue;
 347                 }
 348
 349                 is_spnego = false;
 350                 for (j=0; all_ops[i]->oid[j]; j++) {
 351                         if (strcasecmp(GENSEC_OID_SPNEGO,all_ops[i]->oid[j]) == 0) {
 352                                 is_spnego = true;
 353                         }
 354                 }
 355                 if (is_spnego) {
 356                         continue;
 357                 }
 358
 359                 if (!all_ops[i]->magic) {
 360                         continue;
 361                 }
 362
 363                 nt_status = all_ops[i]->magic(gensec_security, &in);
 364                 if (!NT_STATUS_IS_OK(nt_status)) {
 365                         continue;
 366                 }
 367
 368                 spnego_state->state_position = SPNEGO_FALLBACK;
 369
 370                 nt_status = gensec_subcontext_start(spnego_state,
 371                                                     gensec_security,
 372                                                     &spnego_state->sub_sec_security);
 373
 374                 if (!NT_STATUS_IS_OK(nt_status)) {
 375                         return nt_status;
 376                 }
 377                 /* select the sub context */
 378                 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
 379                                                      all_ops[i]);
 380                 if (!NT_STATUS_IS_OK(nt_status)) {
 381                         return nt_status;
 382                 }
 383                 nt_status = gensec_update(spnego_state->sub_sec_security,
 384                                           out_mem_ctx, in, out);
 385                 return nt_status;
 386         }
 387         DEBUG(1, ("Failed to parse SPNEGO request\n"));
 388         return NT_STATUS_INVALID_PARAMETER;
 389
 390 }
 391
 392 /*
 393    Parse the netTokenInit, either from the client, to the server, or
 394    from the server to the client.
 395 */
 396
 397 static NTSTATUS gensec_spnego_parse_negTokenInit(struct gensec_security *gensec_security,
 398                                                  struct spnego_state *spnego_state,
 399                                                  TALLOC_CTX *out_mem_ctx,
 400                                                  const char **mechType,
 401                                                  const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out)
 402 {
 403         int i;
 404         NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
 405         DATA_BLOB null_data_blob = data_blob(NULL,0);
 406         bool ok;
 407
 408         const struct gensec_security_ops_wrapper *all_sec
 409                 = gensec_security_by_oid_list(gensec_security,
 410                                               out_mem_ctx,
 411                                               mechType,
 412                                               GENSEC_OID_SPNEGO);
 413
 414         ok = spnego_write_mech_types(spnego_state,
 415                                      mechType,
 416                                      &spnego_state->mech_types);
 417         if (!ok) {
 418                 DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
 419                 return NT_STATUS_NO_MEMORY;
 420         }
 421
 422         if (spnego_state->state_position == SPNEGO_SERVER_START) {
 423                 uint32_t j;
 424                 for (j=0; mechType && mechType[j]; j++) {
 425                         for (i=0; all_sec && all_sec[i].op; i++) {
 426                                 nt_status = gensec_subcontext_start(spnego_state,
 427                                                                     gensec_security,
 428                                                                     &spnego_state->sub_sec_security);
 429                                 if (!NT_STATUS_IS_OK(nt_status)) {
 430                                         return nt_status;
 431                                 }
 432                                 /* select the sub context */
 433                                 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
 434                                                                      all_sec[i].op);
 435                                 if (!NT_STATUS_IS_OK(nt_status)) {
 436                                         talloc_free(spnego_state->sub_sec_security);
 437                                         spnego_state->sub_sec_security = NULL;
 438                                         break;
 439                                 }
 440
 441                                 if (j > 0) {
 442                                         /* no optimistic token */
 443                                         spnego_state->neg_oid = all_sec[i].oid;
 444                                         *unwrapped_out = data_blob_null;
 445                                         nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 446                                         break;
 447                                 }
 448
 449                                 nt_status = gensec_update(spnego_state->sub_sec_security,
 450                                                           out_mem_ctx,
 451                                                           unwrapped_in,
 452                                                           unwrapped_out);
 453                                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
 454                                     NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
 455                                         /* Pretend we never started it (lets the first run find some incompatible demand) */
 456
 457                                         DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse contents: %s\n",
 458                                                   spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
 459                                         talloc_free(spnego_state->sub_sec_security);
 460                                         spnego_state->sub_sec_security = NULL;
 461                                         break;
 462                                 }
 463
 464                                 spnego_state->neg_oid = all_sec[i].oid;
 465                                 break;
 466                         }
 467                         if (spnego_state->sub_sec_security) {
 468                                 break;
 469                         }
 470                 }
 471
 472                 if (!spnego_state->sub_sec_security) {
 473                         DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
 474                         return NT_STATUS_INVALID_PARAMETER;
 475                 }
 476         }
 477
 478         /* Having tried any optimistic token from the client (if we
 479          * were the server), if we didn't get anywhere, walk our list
 480          * in our preference order */
 481
 482         if (!spnego_state->sub_sec_security) {
 483                 for (i=0; all_sec && all_sec[i].op; i++) {
 484                         nt_status = gensec_subcontext_start(spnego_state,
 485                                                             gensec_security,
 486                                                             &spnego_state->sub_sec_security);
 487                         if (!NT_STATUS_IS_OK(nt_status)) {
 488                                 return nt_status;
 489                         }
 490                         /* select the sub context */
 491                         nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
 492                                                              all_sec[i].op);
 493                         if (!NT_STATUS_IS_OK(nt_status)) {
 494                                 talloc_free(spnego_state->sub_sec_security);
 495                                 spnego_state->sub_sec_security = NULL;
 496                                 continue;
 497                         }
 498
 499                         spnego_state->neg_oid = all_sec[i].oid;
 500
 501                         /* only get the helping start blob for the first OID */
 502                         nt_status = gensec_update(spnego_state->sub_sec_security,
 503                                                   out_mem_ctx,
 504                                                   null_data_blob,
 505                                                   unwrapped_out);
 506
 507                         /* it is likely that a NULL input token will
 508                          * not be liked by most server mechs, but if
 509                          * we are in the client, we want the first
 510                          * update packet to be able to abort the use
 511                          * of this mech */
 512                         if (spnego_state->state_position != SPNEGO_SERVER_START) {
 513                                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
 514                                     NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_LOGON_SERVERS) ||
 515                                     NT_STATUS_EQUAL(nt_status, NT_STATUS_TIME_DIFFERENCE_AT_DC) ||
 516                                     NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
 517                                         /* Pretend we never started it (lets the first run find some incompatible demand) */
 518
 519                                         DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse: %s\n",
 520                                                   spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
 521                                         talloc_free(spnego_state->sub_sec_security);
 522                                         spnego_state->sub_sec_security = NULL;
 523                                         continue;
 524                                 }
 525                         }
 526
 527                         break;
 528                 }
 529         }
 530
 531         if (spnego_state->sub_sec_security) {
 532                 /* it is likely that a NULL input token will
 533                  * not be liked by most server mechs, but this
 534                  * does the right thing in the CIFS client.
 535                  * just push us along the merry-go-round
 536                  * again, and hope for better luck next
 537                  * time */
 538
 539                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)) {
 540                         *unwrapped_out = data_blob(NULL, 0);
 541                         nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 542                 }
 543
 544                 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)
 545                     && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
 546                     && !NT_STATUS_IS_OK(nt_status)) {
 547                         DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
 548                                   spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
 549                         talloc_free(spnego_state->sub_sec_security);
 550                         spnego_state->sub_sec_security = NULL;
 551
 552                         /* We started the mech correctly, and the
 553                          * input from the other side was valid.
 554                          * Return the error (say bad password, invalid
 555                          * ticket) */
 556                         return nt_status;
 557                 }
 558
 559
 560                 return nt_status; /* OK, INVALID_PARAMETER ore MORE PROCESSING */
 561         }
 562
 563         DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
 564         /* we could re-negotiate here, but it would only work
 565          * if the client or server lied about what it could
 566          * support the first time.  Lets keep this code to
 567          * reality */
 568
 569         return nt_status;
 570 }
 571
 572 /** create a negTokenInit
 573  *
 574  * This is the same packet, no matter if the client or server sends it first, but it is always the first packet
 575 */
 576 static NTSTATUS gensec_spnego_create_negTokenInit(struct gensec_security *gensec_security,
 577                                                   struct spnego_state *spnego_state,
 578                                                   TALLOC_CTX *out_mem_ctx,
 579                                                   const DATA_BLOB in, DATA_BLOB *out)
 580 {
 581         int i;
 582         NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
 583         DATA_BLOB null_data_blob = data_blob(NULL,0);
 584         const char **mechTypes = NULL;
 585         DATA_BLOB unwrapped_out = data_blob(NULL, 0);
 586         const struct gensec_security_ops_wrapper *all_sec;
 587         const char *principal = NULL;
 588
 589         mechTypes = gensec_security_oids(gensec_security,
 590                                          out_mem_ctx, GENSEC_OID_SPNEGO);
 591
 592         all_sec = gensec_security_by_oid_list(gensec_security,
 593                                               out_mem_ctx,
 594                                               mechTypes,
 595                                               GENSEC_OID_SPNEGO);
 596         for (i=0; all_sec && all_sec[i].op; i++) {
 597                 struct spnego_data spnego_out;
 598                 const char **send_mech_types;
 599                 bool ok;
 600
 601                 nt_status = gensec_subcontext_start(spnego_state,
 602                                                     gensec_security,
 603                                                     &spnego_state->sub_sec_security);
 604                 if (!NT_STATUS_IS_OK(nt_status)) {
 605                         return nt_status;
 606                 }
 607                 /* select the sub context */
 608                 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
 609                                                      all_sec[i].op);
 610                 if (!NT_STATUS_IS_OK(nt_status)) {
 611                         talloc_free(spnego_state->sub_sec_security);
 612                         spnego_state->sub_sec_security = NULL;
 613                         continue;
 614                 }
 615
 616                 /* In the client, try and produce the first (optimistic) packet */
 617                 if (spnego_state->state_position == SPNEGO_CLIENT_START) {
 618                         nt_status = gensec_update(spnego_state->sub_sec_security,
 619                                                   out_mem_ctx,
 620                                                   null_data_blob,
 621                                                   &unwrapped_out);
 622
 623                         if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
 624                             && !NT_STATUS_IS_OK(nt_status)) {
 625                                 DEBUG(1, ("SPNEGO(%s) creating NEG_TOKEN_INIT failed: %s\n",
 626                                           spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
 627                                 talloc_free(spnego_state->sub_sec_security);
 628                                 spnego_state->sub_sec_security = NULL;
 629                                 /* Pretend we never started it (lets the first run find some incompatible demand) */
 630
 631                                 continue;
 632                         }
 633                 }
 634
 635                 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
 636
 637                 send_mech_types = gensec_security_oids_from_ops_wrapped(out_mem_ctx,
 638                                                                         &all_sec[i]);
 639
 640                 ok = spnego_write_mech_types(spnego_state,
 641                                              send_mech_types,
 642                                              &spnego_state->mech_types);
 643                 if (!ok) {
 644                         DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
 645                         return NT_STATUS_NO_MEMORY;
 646                 }
 647
 648                 /* List the remaining mechs as options */
 649                 spnego_out.negTokenInit.mechTypes = send_mech_types;
 650                 spnego_out.negTokenInit.reqFlags = null_data_blob;
 651                 spnego_out.negTokenInit.reqFlagsPadding = 0;
 652
 653                 if (spnego_state->state_position == SPNEGO_SERVER_START) {
 654                         spnego_out.negTokenInit.mechListMIC
 655                                 = data_blob_string_const(ADS_IGNORE_PRINCIPAL);
 656                 } else {
 657                         spnego_out.negTokenInit.mechListMIC = null_data_blob;
 658                 }
 659
 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 NEG_TOKEN_INIT\n"));
 664                                 return NT_STATUS_INVALID_PARAMETER;
 665                 }
 666
 667                 /* set next state */
 668                 spnego_state->neg_oid = all_sec[i].oid;
 669
 670                 if (NT_STATUS_IS_OK(nt_status)) {
 671                         spnego_state->no_response_expected = true;
 672                 }
 673
 674                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 675         }
 676         talloc_free(spnego_state->sub_sec_security);
 677         spnego_state->sub_sec_security = NULL;
 678
 679         DEBUG(1, ("Failed to setup SPNEGO negTokenInit request: %s\n", nt_errstr(nt_status)));
 680         return NT_STATUS_INVALID_PARAMETER;
 681 }
 682
 683
 684 /** create a server negTokenTarg
 685  *
 686  * This is the case, where the client is the first one who sends data
 687 */
 688
 689 static NTSTATUS gensec_spnego_server_negTokenTarg(struct gensec_security *gensec_security,
 690                                                   struct spnego_state *spnego_state,
 691                                                   TALLOC_CTX *out_mem_ctx,
 692                                                   NTSTATUS nt_status,
 693                                                   const DATA_BLOB unwrapped_out,
 694                                                   DATA_BLOB mech_list_mic,
 695                                                   DATA_BLOB *out)
 696 {
 697         struct spnego_data spnego_out;
 698         DATA_BLOB null_data_blob = data_blob(NULL, 0);
 699
 700         /* compose reply */
 701         spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
 702         spnego_out.negTokenTarg.responseToken = unwrapped_out;
 703         spnego_out.negTokenTarg.mechListMIC = null_data_blob;
 704         spnego_out.negTokenTarg.supportedMech = NULL;
 705
 706         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 707                 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
 708                 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
 709                 spnego_state->state_position = SPNEGO_SERVER_TARG;
 710         } else if (NT_STATUS_IS_OK(nt_status)) {
 711                 if (unwrapped_out.data) {
 712                         spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
 713                 }
 714                 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
 715                 spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
 716                 spnego_state->state_position = SPNEGO_DONE;
 717         } else {
 718                 spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
 719                 DEBUG(2, ("SPNEGO login failed: %s\n", nt_errstr(nt_status)));
 720                 spnego_state->state_position = SPNEGO_DONE;
 721         }
 722
 723         if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 724                 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
 725                 return NT_STATUS_INVALID_PARAMETER;
 726         }
 727
 728         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 729
 730         return nt_status;
 731 }
 732
 733
 734 static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
 735                                      const DATA_BLOB in, DATA_BLOB *out)
 736 {
 737         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 738         DATA_BLOB null_data_blob = data_blob(NULL, 0);
 739         DATA_BLOB mech_list_mic = data_blob(NULL, 0);
 740         DATA_BLOB unwrapped_out = data_blob(NULL, 0);
 741         struct spnego_data spnego_out;
 742         struct spnego_data spnego;
 743
 744         ssize_t len;
 745
 746         *out = data_blob(NULL, 0);
 747
 748         if (!out_mem_ctx) {
 749                 out_mem_ctx = spnego_state;
 750         }
 751
 752         /* and switch into the state machine */
 753
 754         switch (spnego_state->state_position) {
 755         case SPNEGO_FALLBACK:
 756                 return gensec_update(spnego_state->sub_sec_security,
 757                                      out_mem_ctx, in, out);
 758         case SPNEGO_SERVER_START:
 759         {
 760                 NTSTATUS nt_status;
 761                 if (in.length) {
 762
 763                         len = spnego_read_data(gensec_security, in, &spnego);
 764                         if (len == -1) {
 765                                 return gensec_spnego_server_try_fallback(gensec_security, spnego_state,
 766                                                                          out_mem_ctx, in, out);
 767                         }
 768                         /* client sent NegTargetInit, we send NegTokenTarg */
 769
 770                         /* OK, so it's real SPNEGO, check the packet's the one we expect */
 771                         if (spnego.type != spnego_state->expected_packet) {
 772                                 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 773                                           spnego_state->expected_packet));
 774                                 dump_data(1, in.data, in.length);
 775                                 spnego_free_data(&spnego);
 776                                 return NT_STATUS_INVALID_PARAMETER;
 777                         }
 778
 779                         nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
 780                                                                      spnego_state,
 781                                                                      out_mem_ctx,
 782                                                                      spnego.negTokenInit.mechTypes,
 783                                                                      spnego.negTokenInit.mechToken,
 784                                                                      &unwrapped_out);
 785
 786                         nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
 787                                                                       spnego_state,
 788                                                                       out_mem_ctx,
 789                                                                       nt_status,
 790                                                                       unwrapped_out,
 791                                                                       null_data_blob,
 792                                                                       out);
 793
 794                         spnego_free_data(&spnego);
 795
 796                         return nt_status;
 797                 } else {
 798                         nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
 799                                                                       out_mem_ctx, in, out);
 800                         spnego_state->state_position = SPNEGO_SERVER_START;
 801                         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
 802                         return nt_status;
 803                 }
 804         }
 805
 806         case SPNEGO_CLIENT_START:
 807         {
 808                 /* The server offers a list of mechanisms */
 809
 810                 const char *my_mechs[] = {NULL, NULL};
 811                 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
 812
 813                 if (!in.length) {
 814                         /* client to produce negTokenInit */
 815                         nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
 816                                                                  out_mem_ctx, in, out);
 817                         spnego_state->state_position = SPNEGO_CLIENT_TARG;
 818                         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 819                         return nt_status;
 820                 }
 821
 822                 len = spnego_read_data(gensec_security, in, &spnego);
 823
 824                 if (len == -1) {
 825                         DEBUG(1, ("Invalid SPNEGO request:\n"));
 826                         dump_data(1, in.data, in.length);
 827                         return NT_STATUS_INVALID_PARAMETER;
 828                 }
 829
 830                 /* OK, so it's real SPNEGO, check the packet's the one we expect */
 831                 if (spnego.type != spnego_state->expected_packet) {
 832                         DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 833                                   spnego_state->expected_packet));
 834                         dump_data(1, in.data, in.length);
 835                         spnego_free_data(&spnego);
 836                         return NT_STATUS_INVALID_PARAMETER;
 837                 }
 838
 839                 if (spnego.negTokenInit.targetPrincipal
 840                     && strcmp(spnego.negTokenInit.targetPrincipal, ADS_IGNORE_PRINCIPAL) != 0) {
 841                         DEBUG(5, ("Server claims it's principal name is %s\n", spnego.negTokenInit.targetPrincipal));
 842                         if (lpcfg_client_use_spnego_principal(gensec_security->settings->lp_ctx)) {
 843                                 gensec_set_target_principal(gensec_security, spnego.negTokenInit.targetPrincipal);
 844                         }
 845                 }
 846
 847                 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
 848                                                              spnego_state,
 849                                                              out_mem_ctx,
 850                                                              spnego.negTokenInit.mechTypes,
 851                                                              spnego.negTokenInit.mechToken,
 852                                                              &unwrapped_out);
 853
 854                 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
 855                         spnego_free_data(&spnego);
 856                         return nt_status;
 857                 }
 858
 859                 my_mechs[0] = spnego_state->neg_oid;
 860                 /* compose reply */
 861                 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
 862                 spnego_out.negTokenInit.mechTypes = my_mechs;
 863                 spnego_out.negTokenInit.reqFlags = null_data_blob;
 864                 spnego_out.negTokenInit.reqFlagsPadding = 0;
 865                 spnego_out.negTokenInit.mechListMIC = null_data_blob;
 866                 spnego_out.negTokenInit.mechToken = unwrapped_out;
 867
 868                 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 869                         DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
 870                                 return NT_STATUS_INVALID_PARAMETER;
 871                 }
 872
 873                 /* set next state */
 874                 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 875                 spnego_state->state_position = SPNEGO_CLIENT_TARG;
 876
 877                 if (NT_STATUS_IS_OK(nt_status)) {
 878                         spnego_state->no_response_expected = true;
 879                 }
 880
 881                 spnego_free_data(&spnego);
 882                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 883         }
 884         case SPNEGO_SERVER_TARG:
 885         {
 886                 NTSTATUS nt_status;
 887                 bool new_spnego = false;
 888
 889                 if (!in.length) {
 890                         return NT_STATUS_INVALID_PARAMETER;
 891                 }
 892
 893                 len = spnego_read_data(gensec_security, in, &spnego);
 894
 895                 if (len == -1) {
 896                         DEBUG(1, ("Invalid SPNEGO request:\n"));
 897                         dump_data(1, in.data, in.length);
 898                         return NT_STATUS_INVALID_PARAMETER;
 899                 }
 900
 901                 /* OK, so it's real SPNEGO, check the packet's the one we expect */
 902                 if (spnego.type != spnego_state->expected_packet) {
 903                         DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 904                                   spnego_state->expected_packet));
 905                         dump_data(1, in.data, in.length);
 906                         spnego_free_data(&spnego);
 907                         return NT_STATUS_INVALID_PARAMETER;
 908                 }
 909
 910                 if (!spnego_state->sub_sec_security) {
 911                         DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
 912                         spnego_free_data(&spnego);
 913                         return NT_STATUS_INVALID_PARAMETER;
 914                 }
 915
 916                 nt_status = gensec_update(spnego_state->sub_sec_security,
 917                                           out_mem_ctx,
 918                                           spnego.negTokenTarg.responseToken,
 919                                           &unwrapped_out);
 920                 if (NT_STATUS_IS_OK(nt_status) && spnego.negTokenTarg.mechListMIC.length > 0) {
 921                         new_spnego = true;
 922                         nt_status = gensec_check_packet(spnego_state->sub_sec_security,
 923                                                         out_mem_ctx,
 924                                                         spnego_state->mech_types.data,
 925                                                         spnego_state->mech_types.length,
 926                                                         spnego_state->mech_types.data,
 927                                                         spnego_state->mech_types.length,
 928                                                         &spnego.negTokenTarg.mechListMIC);
 929                         if (!NT_STATUS_IS_OK(nt_status)) {
 930                                 DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
 931                                         nt_errstr(nt_status)));
 932                         }
 933                 }
 934                 if (NT_STATUS_IS_OK(nt_status) && new_spnego) {
 935                         nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
 936                                                        out_mem_ctx,
 937                                                        spnego_state->mech_types.data,
 938                                                        spnego_state->mech_types.length,
 939                                                        spnego_state->mech_types.data,
 940                                                        spnego_state->mech_types.length,
 941                                                        &mech_list_mic);
 942                         if (!NT_STATUS_IS_OK(nt_status)) {
 943                                 DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
 944                                         nt_errstr(nt_status)));
 945                         }
 946                 }
 947
 948                 nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
 949                                                               spnego_state,
 950                                                               out_mem_ctx,
 951                                                               nt_status,
 952                                                               unwrapped_out,
 953                                                               mech_list_mic,
 954                                                               out);
 955
 956                 spnego_free_data(&spnego);
 957
 958                 return nt_status;
 959         }
 960         case SPNEGO_CLIENT_TARG:
 961         {
 962                 NTSTATUS nt_status;
 963                 if (!in.length) {
 964                         return NT_STATUS_INVALID_PARAMETER;
 965                 }
 966
 967                 len = spnego_read_data(gensec_security, in, &spnego);
 968
 969                 if (len == -1) {
 970                         DEBUG(1, ("Invalid SPNEGO request:\n"));
 971                         dump_data(1, in.data, in.length);
 972                         return NT_STATUS_INVALID_PARAMETER;
 973                 }
 974
 975                 /* OK, so it's real SPNEGO, check the packet's the one we expect */
 976                 if (spnego.type != spnego_state->expected_packet) {
 977                         DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 978                                   spnego_state->expected_packet));
 979                         dump_data(1, in.data, in.length);
 980                         spnego_free_data(&spnego);
 981                         return NT_STATUS_INVALID_PARAMETER;
 982                 }
 983
 984                 if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
 985                         spnego_free_data(&spnego);
 986                         return NT_STATUS_ACCESS_DENIED;
 987                 }
 988
 989                 /* Server didn't like our choice of mech, and chose something else */
 990                 if ((spnego.negTokenTarg.negResult == SPNEGO_ACCEPT_INCOMPLETE) &&
 991                     spnego.negTokenTarg.supportedMech &&
 992                     strcmp(spnego.negTokenTarg.supportedMech, spnego_state->neg_oid) != 0) {
 993                         DEBUG(3,("GENSEC SPNEGO: client preferred mech (%s) not accepted, server wants: %s\n",
 994                                  gensec_get_name_by_oid(gensec_security, spnego.negTokenTarg.supportedMech),
 995                                  gensec_get_name_by_oid(gensec_security, spnego_state->neg_oid)));
 996
 997                         talloc_free(spnego_state->sub_sec_security);
 998                         nt_status = gensec_subcontext_start(spnego_state,
 999                                                             gensec_security,
1000                                                             &spnego_state->sub_sec_security);
1001                         if (!NT_STATUS_IS_OK(nt_status)) {
1002                                 spnego_free_data(&spnego);
1003                                 return nt_status;
1004                         }
1005                         /* select the sub context */
1006                         nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
1007                                                              spnego.negTokenTarg.supportedMech);
1008                         if (!NT_STATUS_IS_OK(nt_status)) {
1009                                 spnego_free_data(&spnego);
1010                                 return nt_status;
1011                         }
1012
1013                         nt_status = gensec_update(spnego_state->sub_sec_security,
1014                                                   out_mem_ctx,
1015                                                   spnego.negTokenTarg.responseToken,
1016                                                   &unwrapped_out);
1017                         spnego_state->neg_oid = talloc_strdup(spnego_state, spnego.negTokenTarg.supportedMech);
1018                 } else if (spnego_state->no_response_expected) {
1019                         if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1020                                 DEBUG(3,("GENSEC SPNEGO: client GENSEC accepted, but server rejected (bad password?)\n"));
1021                                 nt_status = NT_STATUS_INVALID_PARAMETER;
1022                         } else if (spnego.negTokenTarg.responseToken.length) {
1023                                 DEBUG(2,("GENSEC SPNEGO: client GENSEC accepted, but server continued negotiation!\n"));
1024                                 nt_status = NT_STATUS_INVALID_PARAMETER;
1025                         } else {
1026                                 nt_status = NT_STATUS_OK;
1027                         }
1028                         if (NT_STATUS_IS_OK(nt_status) && spnego.negTokenTarg.mechListMIC.length > 0) {
1029                                 nt_status = gensec_check_packet(spnego_state->sub_sec_security,
1030                                                                 out_mem_ctx,
1031                                                                 spnego_state->mech_types.data,
1032                                                                 spnego_state->mech_types.length,
1033                                                                 spnego_state->mech_types.data,
1034                                                                 spnego_state->mech_types.length,
1035                                                                 &spnego.negTokenTarg.mechListMIC);
1036                                 if (!NT_STATUS_IS_OK(nt_status)) {
1037                                         DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
1038                                                 nt_errstr(nt_status)));
1039                                 }
1040                         }
1041                 } else {
1042                         bool new_spnego = false;
1043
1044                         nt_status = gensec_update(spnego_state->sub_sec_security,
1045                                                   out_mem_ctx,
1046                                                   spnego.negTokenTarg.responseToken,
1047                                                   &unwrapped_out);
1048
1049                         if (NT_STATUS_IS_OK(nt_status)
1050                             && spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1051                                 new_spnego = gensec_have_feature(spnego_state->sub_sec_security,
1052                                                                  GENSEC_FEATURE_NEW_SPNEGO);
1053                         }
1054                         if (NT_STATUS_IS_OK(nt_status) && new_spnego) {
1055                                 nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
1056                                                                out_mem_ctx,
1057                                                                spnego_state->mech_types.data,
1058                                                                spnego_state->mech_types.length,
1059                                                                spnego_state->mech_types.data,
1060                                                                spnego_state->mech_types.length,
1061                                                                &mech_list_mic);
1062                                 if (!NT_STATUS_IS_OK(nt_status)) {
1063                                         DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
1064                                                 nt_errstr(nt_status)));
1065                                 }
1066                         }
1067                         if (NT_STATUS_IS_OK(nt_status)) {
1068                                 spnego_state->no_response_expected = true;
1069                         }
1070                 }
1071
1072                 spnego_free_data(&spnego);
1073
1074                 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
1075                         && !NT_STATUS_IS_OK(nt_status)) {
1076                         DEBUG(1, ("SPNEGO(%s) login failed: %s\n",
1077                                   spnego_state->sub_sec_security->ops->name,
1078                                   nt_errstr(nt_status)));
1079                         return nt_status;
1080                 }
1081
1082                 if (unwrapped_out.length || mech_list_mic.length) {
1083                         /* compose reply */
1084                         spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
1085                         spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
1086                         spnego_out.negTokenTarg.supportedMech = NULL;
1087                         spnego_out.negTokenTarg.responseToken = unwrapped_out;
1088                         spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
1089
1090                         if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
1091                                 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
1092                                 return NT_STATUS_INVALID_PARAMETER;
1093                         }
1094
1095                         spnego_state->state_position = SPNEGO_CLIENT_TARG;
1096                         nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
1097                 } else {
1098
1099                         /* all done - server has accepted, and we agree */
1100                         *out = null_data_blob;
1101
1102                         if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1103                                 /* unless of course it did not accept */
1104                                 DEBUG(1,("gensec_update ok but not accepted\n"));
1105                                 nt_status = NT_STATUS_INVALID_PARAMETER;
1106                         }
1107
1108                         spnego_state->state_position = SPNEGO_DONE;
1109                 }
1110
1111                 return nt_status;
1112         }
1113         case SPNEGO_DONE:
1114                 /* We should not be called after we are 'done' */
1115                 return NT_STATUS_INVALID_PARAMETER;
1116         }
1117         return NT_STATUS_INVALID_PARAMETER;
1118 }
1119
1120 static void gensec_spnego_want_feature(struct gensec_security *gensec_security,
1121                                        uint32_t feature)
1122 {
1123         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1124
1125         if (!spnego_state || !spnego_state->sub_sec_security) {
1126                 gensec_security->want_features |= feature;
1127                 return;
1128         }
1129
1130         gensec_want_feature(spnego_state->sub_sec_security,
1131                             feature);
1132 }
1133
1134 static bool gensec_spnego_have_feature(struct gensec_security *gensec_security,
1135                                        uint32_t feature)
1136 {
1137         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
1138         if (!spnego_state->sub_sec_security) {
1139                 return false;
1140         }
1141
1142         return gensec_have_feature(spnego_state->sub_sec_security,
1143                                    feature);
1144 }
1145
1146 static const char *gensec_spnego_oids[] = {
1147         GENSEC_OID_SPNEGO,
1148         NULL
1149 };
1150
1151 static const struct gensec_security_ops gensec_spnego_security_ops = {
1152         .name             = "spnego",
1153         .sasl_name        = "GSS-SPNEGO",
1154         .auth_type        = DCERPC_AUTH_TYPE_SPNEGO,
1155         .oid              = gensec_spnego_oids,
1156         .client_start     = gensec_spnego_client_start,
1157         .server_start     = gensec_spnego_server_start,
1158         .update           = gensec_spnego_update,
1159         .seal_packet      = gensec_spnego_seal_packet,
1160         .sign_packet      = gensec_spnego_sign_packet,
1161         .sig_size         = gensec_spnego_sig_size,
1162         .max_wrapped_size = gensec_spnego_max_wrapped_size,
1163         .max_input_size   = gensec_spnego_max_input_size,
1164         .check_packet     = gensec_spnego_check_packet,
1165         .unseal_packet    = gensec_spnego_unseal_packet,
1166         .packet_full_request = gensec_spnego_packet_full_request,
1167         .wrap             = gensec_spnego_wrap,
1168         .unwrap           = gensec_spnego_unwrap,
1169         .wrap_packets     = gensec_spnego_wrap_packets,
1170         .unwrap_packets   = gensec_spnego_unwrap_packets,
1171         .session_key      = gensec_spnego_session_key,
1172         .session_info     = gensec_spnego_session_info,
1173         .want_feature     = gensec_spnego_want_feature,
1174         .have_feature     = gensec_spnego_have_feature,
1175         .enabled          = true,
1176         .priority         = GENSEC_SPNEGO
1177 };
1178
1179 _PUBLIC_ NTSTATUS gensec_spnego_init(void)
1180 {
1181         NTSTATUS ret;
1182         ret = gensec_register(&gensec_spnego_security_ops);
1183         if (!NT_STATUS_IS_OK(ret)) {
1184                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1185                         gensec_spnego_security_ops.name));
1186                 return ret;
1187         }
1188
1189         return ret;
1190 }