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 "auth/gensec/gensec_toplevel_proto.h"
  32 #include "param/param.h"
  33
  34 _PUBLIC_ NTSTATUS gensec_spnego_init(void);
  35
  36 enum spnego_state_position {
  37         SPNEGO_SERVER_START,
  38         SPNEGO_CLIENT_START,
  39         SPNEGO_SERVER_TARG,
  40         SPNEGO_CLIENT_TARG,
  41         SPNEGO_FALLBACK,
  42         SPNEGO_DONE
  43 };
  44
  45 struct spnego_state {
  46         enum spnego_message_type expected_packet;
  47         enum spnego_state_position state_position;
  48         struct gensec_security *sub_sec_security;
  49         bool no_response_expected;
  50
  51         const char *neg_oid;
  52
  53         DATA_BLOB mech_types;
  54 };
  55
  56
  57 static NTSTATUS gensec_spnego_client_start(struct gensec_security *gensec_security)
  58 {
  59         struct spnego_state *spnego_state;
  60
  61         spnego_state = talloc(gensec_security, struct spnego_state);
  62         if (!spnego_state) {
  63                 return NT_STATUS_NO_MEMORY;
  64         }
  65
  66         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
  67         spnego_state->state_position = SPNEGO_CLIENT_START;
  68         spnego_state->sub_sec_security = NULL;
  69         spnego_state->no_response_expected = false;
  70         spnego_state->mech_types = data_blob(NULL, 0);
  71
  72         gensec_security->private_data = spnego_state;
  73         return NT_STATUS_OK;
  74 }
  75
  76 static NTSTATUS gensec_spnego_server_start(struct gensec_security *gensec_security)
  77 {
  78         struct spnego_state *spnego_state;
  79
  80         spnego_state = talloc(gensec_security, struct spnego_state);
  81         if (!spnego_state) {
  82                 return NT_STATUS_NO_MEMORY;
  83         }
  84
  85         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
  86         spnego_state->state_position = SPNEGO_SERVER_START;
  87         spnego_state->sub_sec_security = NULL;
  88         spnego_state->no_response_expected = false;
  89         spnego_state->mech_types = data_blob(NULL, 0);
  90
  91         gensec_security->private_data = spnego_state;
  92         return NT_STATUS_OK;
  93 }
  94
  95 /*
  96   wrappers for the spnego_*() functions
  97 */
  98 static NTSTATUS gensec_spnego_unseal_packet(struct gensec_security *gensec_security,
  99                                             uint8_t *data, size_t length,
 100                                             const uint8_t *whole_pdu, size_t pdu_length,
 101                                             const DATA_BLOB *sig)
 102 {
 103         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 104
 105         if (spnego_state->state_position != SPNEGO_DONE
 106             && spnego_state->state_position != SPNEGO_FALLBACK) {
 107                 return NT_STATUS_INVALID_PARAMETER;
 108         }
 109
 110         return gensec_unseal_packet(spnego_state->sub_sec_security,
 111                                     data, length,
 112                                     whole_pdu, pdu_length,
 113                                     sig);
 114 }
 115
 116 static NTSTATUS gensec_spnego_check_packet(struct gensec_security *gensec_security,
 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                                    data, length,
 130                                    whole_pdu, pdu_length,
 131                                    sig);
 132 }
 133
 134 static NTSTATUS gensec_spnego_seal_packet(struct gensec_security *gensec_security,
 135                                           TALLOC_CTX *mem_ctx,
 136                                           uint8_t *data, size_t length,
 137                                           const uint8_t *whole_pdu, size_t pdu_length,
 138                                           DATA_BLOB *sig)
 139 {
 140         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 141
 142         if (spnego_state->state_position != SPNEGO_DONE
 143             && spnego_state->state_position != SPNEGO_FALLBACK) {
 144                 return NT_STATUS_INVALID_PARAMETER;
 145         }
 146
 147         return gensec_seal_packet(spnego_state->sub_sec_security,
 148                                   mem_ctx,
 149                                   data, length,
 150                                   whole_pdu, pdu_length,
 151                                   sig);
 152 }
 153
 154 static NTSTATUS gensec_spnego_sign_packet(struct gensec_security *gensec_security,
 155                                           TALLOC_CTX *mem_ctx,
 156                                           const uint8_t *data, size_t length,
 157                                           const uint8_t *whole_pdu, size_t pdu_length,
 158                                           DATA_BLOB *sig)
 159 {
 160         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 161
 162         if (spnego_state->state_position != SPNEGO_DONE
 163             && spnego_state->state_position != SPNEGO_FALLBACK) {
 164                 return NT_STATUS_INVALID_PARAMETER;
 165         }
 166
 167         return gensec_sign_packet(spnego_state->sub_sec_security,
 168                                   mem_ctx,
 169                                   data, length,
 170                                   whole_pdu, pdu_length,
 171                                   sig);
 172 }
 173
 174 static NTSTATUS gensec_spnego_wrap(struct gensec_security *gensec_security,
 175                                    TALLOC_CTX *mem_ctx,
 176                                    const DATA_BLOB *in,
 177                                    DATA_BLOB *out)
 178 {
 179         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 180
 181         if (spnego_state->state_position != SPNEGO_DONE
 182             && spnego_state->state_position != SPNEGO_FALLBACK) {
 183                 DEBUG(1, ("gensec_spnego_wrap: wrong state for wrap\n"));
 184                 return NT_STATUS_INVALID_PARAMETER;
 185         }
 186
 187         return gensec_wrap(spnego_state->sub_sec_security,
 188                            mem_ctx, in, out);
 189 }
 190
 191 static NTSTATUS gensec_spnego_unwrap(struct gensec_security *gensec_security,
 192                                      TALLOC_CTX *mem_ctx,
 193                                      const DATA_BLOB *in,
 194                                      DATA_BLOB *out)
 195 {
 196         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 197
 198         if (spnego_state->state_position != SPNEGO_DONE
 199             && spnego_state->state_position != SPNEGO_FALLBACK) {
 200                 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
 201                 return NT_STATUS_INVALID_PARAMETER;
 202         }
 203
 204         return gensec_unwrap(spnego_state->sub_sec_security,
 205                              mem_ctx, in, out);
 206 }
 207
 208 static NTSTATUS gensec_spnego_wrap_packets(struct gensec_security *gensec_security,
 209                                            TALLOC_CTX *mem_ctx,
 210                                            const DATA_BLOB *in,
 211                                            DATA_BLOB *out,
 212                                            size_t *len_processed)
 213 {
 214         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 215
 216         if (spnego_state->state_position != SPNEGO_DONE
 217             && spnego_state->state_position != SPNEGO_FALLBACK) {
 218                 DEBUG(1, ("gensec_spnego_wrap: wrong state for wrap\n"));
 219                 return NT_STATUS_INVALID_PARAMETER;
 220         }
 221
 222         return gensec_wrap_packets(spnego_state->sub_sec_security,
 223                                    mem_ctx, in, out,
 224                                    len_processed);
 225 }
 226
 227 static NTSTATUS gensec_spnego_packet_full_request(struct gensec_security *gensec_security,
 228                                                 DATA_BLOB blob, size_t *size)
 229 {
 230         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 231
 232         if (spnego_state->state_position != SPNEGO_DONE
 233             && spnego_state->state_position != SPNEGO_FALLBACK) {
 234                 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
 235                 return NT_STATUS_INVALID_PARAMETER;
 236         }
 237
 238         return gensec_packet_full_request(spnego_state->sub_sec_security,
 239                                           blob, size);
 240 }
 241
 242 static NTSTATUS gensec_spnego_unwrap_packets(struct gensec_security *gensec_security,
 243                                              TALLOC_CTX *mem_ctx,
 244                                              const DATA_BLOB *in,
 245                                              DATA_BLOB *out,
 246                                              size_t *len_processed)
 247 {
 248         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 249
 250         if (spnego_state->state_position != SPNEGO_DONE
 251             && spnego_state->state_position != SPNEGO_FALLBACK) {
 252                 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
 253                 return NT_STATUS_INVALID_PARAMETER;
 254         }
 255
 256         return gensec_unwrap_packets(spnego_state->sub_sec_security,
 257                                      mem_ctx, in, out,
 258                                      len_processed);
 259 }
 260
 261 static size_t gensec_spnego_sig_size(struct gensec_security *gensec_security, size_t data_size)
 262 {
 263         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 264
 265         if (spnego_state->state_position != SPNEGO_DONE
 266             && spnego_state->state_position != SPNEGO_FALLBACK) {
 267                 return 0;
 268         }
 269
 270         return gensec_sig_size(spnego_state->sub_sec_security, data_size);
 271 }
 272
 273 static size_t gensec_spnego_max_input_size(struct gensec_security *gensec_security)
 274 {
 275         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 276
 277         if (spnego_state->state_position != SPNEGO_DONE
 278             && spnego_state->state_position != SPNEGO_FALLBACK) {
 279                 return 0;
 280         }
 281
 282         return gensec_max_input_size(spnego_state->sub_sec_security);
 283 }
 284
 285 static size_t gensec_spnego_max_wrapped_size(struct gensec_security *gensec_security)
 286 {
 287         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 288
 289         if (spnego_state->state_position != SPNEGO_DONE
 290             && spnego_state->state_position != SPNEGO_FALLBACK) {
 291                 return 0;
 292         }
 293
 294         return gensec_max_wrapped_size(spnego_state->sub_sec_security);
 295 }
 296
 297 static NTSTATUS gensec_spnego_session_key(struct gensec_security *gensec_security,
 298                                           TALLOC_CTX *mem_ctx,
 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                                   mem_ctx,
 308                                   session_key);
 309 }
 310
 311 static NTSTATUS gensec_spnego_session_info(struct gensec_security *gensec_security,
 312                                            TALLOC_CTX *mem_ctx,
 313                                            struct auth_session_info **session_info)
 314 {
 315         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 316         if (!spnego_state->sub_sec_security) {
 317                 return NT_STATUS_INVALID_PARAMETER;
 318         }
 319
 320         return gensec_session_info(spnego_state->sub_sec_security,
 321                                    mem_ctx,
 322                                    session_info);
 323 }
 324
 325 /** Fallback to another GENSEC mechanism, based on magic strings
 326  *
 327  * This is the 'fallback' case, where we don't get SPNEGO, and have to
 328  * try all the other options (and hope they all have a magic string
 329  * they check)
 330 */
 331
 332 static NTSTATUS gensec_spnego_server_try_fallback(struct gensec_security *gensec_security,
 333                                                   struct spnego_state *spnego_state,
 334                                                   TALLOC_CTX *out_mem_ctx,
 335                                                   const DATA_BLOB in, DATA_BLOB *out)
 336 {
 337         int i,j;
 338         struct gensec_security_ops **all_ops
 339                 = gensec_security_mechs(gensec_security, out_mem_ctx);
 340         for (i=0; all_ops[i]; i++) {
 341                 bool is_spnego;
 342                 NTSTATUS nt_status;
 343
 344                 if (gensec_security != NULL &&
 345                                 !gensec_security_ops_enabled(all_ops[i], gensec_security))
 346                     continue;
 347
 348                 if (!all_ops[i]->oid) {
 349                         continue;
 350                 }
 351
 352                 is_spnego = false;
 353                 for (j=0; all_ops[i]->oid[j]; j++) {
 354                         if (strcasecmp(GENSEC_OID_SPNEGO,all_ops[i]->oid[j]) == 0) {
 355                                 is_spnego = true;
 356                         }
 357                 }
 358                 if (is_spnego) {
 359                         continue;
 360                 }
 361
 362                 if (!all_ops[i]->magic) {
 363                         continue;
 364                 }
 365
 366                 nt_status = all_ops[i]->magic(gensec_security, &in);
 367                 if (!NT_STATUS_IS_OK(nt_status)) {
 368                         continue;
 369                 }
 370
 371                 spnego_state->state_position = SPNEGO_FALLBACK;
 372
 373                 nt_status = gensec_subcontext_start(spnego_state,
 374                                                     gensec_security,
 375                                                     &spnego_state->sub_sec_security);
 376
 377                 if (!NT_STATUS_IS_OK(nt_status)) {
 378                         return nt_status;
 379                 }
 380                 /* select the sub context */
 381                 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
 382                                                      all_ops[i]);
 383                 if (!NT_STATUS_IS_OK(nt_status)) {
 384                         return nt_status;
 385                 }
 386                 nt_status = gensec_update(spnego_state->sub_sec_security,
 387                                           out_mem_ctx, in, out);
 388                 return nt_status;
 389         }
 390         DEBUG(1, ("Failed to parse SPNEGO request\n"));
 391         return NT_STATUS_INVALID_PARAMETER;
 392
 393 }
 394
 395 /*
 396    Parse the netTokenInit, either from the client, to the server, or
 397    from the server to the client.
 398 */
 399
 400 static NTSTATUS gensec_spnego_parse_negTokenInit(struct gensec_security *gensec_security,
 401                                                  struct spnego_state *spnego_state,
 402                                                  TALLOC_CTX *out_mem_ctx,
 403                                                  const char **mechType,
 404                                                  const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out)
 405 {
 406         int i;
 407         NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
 408         DATA_BLOB null_data_blob = data_blob(NULL,0);
 409         bool ok;
 410
 411         const struct gensec_security_ops_wrapper *all_sec
 412                 = gensec_security_by_oid_list(gensec_security,
 413                                               out_mem_ctx,
 414                                               mechType,
 415                                               GENSEC_OID_SPNEGO);
 416
 417         ok = spnego_write_mech_types(spnego_state,
 418                                      mechType,
 419                                      &spnego_state->mech_types);
 420         if (!ok) {
 421                 DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
 422                 return NT_STATUS_NO_MEMORY;
 423         }
 424
 425         if (spnego_state->state_position == SPNEGO_SERVER_START) {
 426                 uint32_t j;
 427                 for (j=0; mechType && mechType[j]; j++) {
 428                         for (i=0; all_sec && all_sec[i].op; i++) {
 429                                 nt_status = gensec_subcontext_start(spnego_state,
 430                                                                     gensec_security,
 431                                                                     &spnego_state->sub_sec_security);
 432                                 if (!NT_STATUS_IS_OK(nt_status)) {
 433                                         return nt_status;
 434                                 }
 435                                 /* select the sub context */
 436                                 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
 437                                                                      all_sec[i].op);
 438                                 if (!NT_STATUS_IS_OK(nt_status)) {
 439                                         talloc_free(spnego_state->sub_sec_security);
 440                                         spnego_state->sub_sec_security = NULL;
 441                                         break;
 442                                 }
 443
 444                                 if (j > 0) {
 445                                         /* no optimistic token */
 446                                         spnego_state->neg_oid = all_sec[i].oid;
 447                                         *unwrapped_out = data_blob_null;
 448                                         nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 449                                         break;
 450                                 }
 451
 452                                 nt_status = gensec_update(spnego_state->sub_sec_security,
 453                                                           out_mem_ctx,
 454                                                           unwrapped_in,
 455                                                           unwrapped_out);
 456                                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
 457                                     NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
 458                                         /* Pretend we never started it (lets the first run find some incompatible demand) */
 459
 460                                         DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse contents: %s\n",
 461                                                   spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
 462                                         talloc_free(spnego_state->sub_sec_security);
 463                                         spnego_state->sub_sec_security = NULL;
 464                                         break;
 465                                 }
 466
 467                                 spnego_state->neg_oid = all_sec[i].oid;
 468                                 break;
 469                         }
 470                         if (spnego_state->sub_sec_security) {
 471                                 break;
 472                         }
 473                 }
 474
 475                 if (!spnego_state->sub_sec_security) {
 476                         DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
 477                         return NT_STATUS_INVALID_PARAMETER;
 478                 }
 479         }
 480
 481         /* Having tried any optimistic token from the client (if we
 482          * were the server), if we didn't get anywhere, walk our list
 483          * in our preference order */
 484
 485         if (!spnego_state->sub_sec_security) {
 486                 for (i=0; all_sec && all_sec[i].op; i++) {
 487                         nt_status = gensec_subcontext_start(spnego_state,
 488                                                             gensec_security,
 489                                                             &spnego_state->sub_sec_security);
 490                         if (!NT_STATUS_IS_OK(nt_status)) {
 491                                 return nt_status;
 492                         }
 493                         /* select the sub context */
 494                         nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
 495                                                              all_sec[i].op);
 496                         if (!NT_STATUS_IS_OK(nt_status)) {
 497                                 talloc_free(spnego_state->sub_sec_security);
 498                                 spnego_state->sub_sec_security = NULL;
 499                                 continue;
 500                         }
 501
 502                         spnego_state->neg_oid = all_sec[i].oid;
 503
 504                         /* only get the helping start blob for the first OID */
 505                         nt_status = gensec_update(spnego_state->sub_sec_security,
 506                                                   out_mem_ctx,
 507                                                   null_data_blob,
 508                                                   unwrapped_out);
 509
 510                         /* it is likely that a NULL input token will
 511                          * not be liked by most server mechs, but if
 512                          * we are in the client, we want the first
 513                          * update packet to be able to abort the use
 514                          * of this mech */
 515                         if (spnego_state->state_position != SPNEGO_SERVER_START) {
 516                                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
 517                                     NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_LOGON_SERVERS) ||
 518                                     NT_STATUS_EQUAL(nt_status, NT_STATUS_TIME_DIFFERENCE_AT_DC) ||
 519                                     NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
 520                                         /* Pretend we never started it (lets the first run find some incompatible demand) */
 521
 522                                         DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse: %s\n",
 523                                                   spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
 524                                         talloc_free(spnego_state->sub_sec_security);
 525                                         spnego_state->sub_sec_security = NULL;
 526                                         continue;
 527                                 }
 528                         }
 529
 530                         break;
 531                 }
 532         }
 533
 534         if (spnego_state->sub_sec_security) {
 535                 /* it is likely that a NULL input token will
 536                  * not be liked by most server mechs, but this
 537                  * does the right thing in the CIFS client.
 538                  * just push us along the merry-go-round
 539                  * again, and hope for better luck next
 540                  * time */
 541
 542                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)) {
 543                         *unwrapped_out = data_blob(NULL, 0);
 544                         nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 545                 }
 546
 547                 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)
 548                     && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
 549                     && !NT_STATUS_IS_OK(nt_status)) {
 550                         DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
 551                                   spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
 552                         talloc_free(spnego_state->sub_sec_security);
 553                         spnego_state->sub_sec_security = NULL;
 554
 555                         /* We started the mech correctly, and the
 556                          * input from the other side was valid.
 557                          * Return the error (say bad password, invalid
 558                          * ticket) */
 559                         return nt_status;
 560                 }
 561
 562
 563                 return nt_status; /* OK, INVALID_PARAMETER ore MORE PROCESSING */
 564         }
 565
 566         DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
 567         /* we could re-negotiate here, but it would only work
 568          * if the client or server lied about what it could
 569          * support the first time.  Lets keep this code to
 570          * reality */
 571
 572         return nt_status;
 573 }
 574
 575 /** create a negTokenInit
 576  *
 577  * This is the same packet, no matter if the client or server sends it first, but it is always the first packet
 578 */
 579 static NTSTATUS gensec_spnego_create_negTokenInit(struct gensec_security *gensec_security,
 580                                                   struct spnego_state *spnego_state,
 581                                                   TALLOC_CTX *out_mem_ctx,
 582                                                   const DATA_BLOB in, DATA_BLOB *out)
 583 {
 584         int i;
 585         NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
 586         DATA_BLOB null_data_blob = data_blob(NULL,0);
 587         const char **mechTypes = NULL;
 588         DATA_BLOB unwrapped_out = data_blob(NULL, 0);
 589         const struct gensec_security_ops_wrapper *all_sec;
 590
 591         mechTypes = gensec_security_oids(gensec_security,
 592                                          out_mem_ctx, GENSEC_OID_SPNEGO);
 593
 594         all_sec = gensec_security_by_oid_list(gensec_security,
 595                                               out_mem_ctx,
 596                                               mechTypes,
 597                                               GENSEC_OID_SPNEGO);
 598         for (i=0; all_sec && all_sec[i].op; i++) {
 599                 struct spnego_data spnego_out;
 600                 const char **send_mech_types;
 601                 bool ok;
 602
 603                 nt_status = gensec_subcontext_start(spnego_state,
 604                                                     gensec_security,
 605                                                     &spnego_state->sub_sec_security);
 606                 if (!NT_STATUS_IS_OK(nt_status)) {
 607                         return nt_status;
 608                 }
 609                 /* select the sub context */
 610                 nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
 611                                                      all_sec[i].op);
 612                 if (!NT_STATUS_IS_OK(nt_status)) {
 613                         talloc_free(spnego_state->sub_sec_security);
 614                         spnego_state->sub_sec_security = NULL;
 615                         continue;
 616                 }
 617
 618                 /* In the client, try and produce the first (optimistic) packet */
 619                 if (spnego_state->state_position == SPNEGO_CLIENT_START) {
 620                         nt_status = gensec_update(spnego_state->sub_sec_security,
 621                                                   out_mem_ctx,
 622                                                   null_data_blob,
 623                                                   &unwrapped_out);
 624
 625                         if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
 626                             && !NT_STATUS_IS_OK(nt_status)) {
 627                                 DEBUG(1, ("SPNEGO(%s) creating NEG_TOKEN_INIT failed: %s\n",
 628                                           spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
 629                                 talloc_free(spnego_state->sub_sec_security);
 630                                 spnego_state->sub_sec_security = NULL;
 631                                 /* Pretend we never started it (lets the first run find some incompatible demand) */
 632
 633                                 continue;
 634                         }
 635                 }
 636
 637                 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
 638
 639                 send_mech_types = gensec_security_oids_from_ops_wrapped(out_mem_ctx,
 640                                                                         &all_sec[i]);
 641
 642                 ok = spnego_write_mech_types(spnego_state,
 643                                              send_mech_types,
 644                                              &spnego_state->mech_types);
 645                 if (!ok) {
 646                         DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
 647                         return NT_STATUS_NO_MEMORY;
 648                 }
 649
 650                 /* List the remaining mechs as options */
 651                 spnego_out.negTokenInit.mechTypes = send_mech_types;
 652                 spnego_out.negTokenInit.reqFlags = null_data_blob;
 653                 spnego_out.negTokenInit.reqFlagsPadding = 0;
 654
 655                 if (spnego_state->state_position == SPNEGO_SERVER_START) {
 656                         spnego_out.negTokenInit.mechListMIC
 657                                 = data_blob_string_const(ADS_IGNORE_PRINCIPAL);
 658                 } else {
 659                         spnego_out.negTokenInit.mechListMIC = null_data_blob;
 660                 }
 661
 662                 spnego_out.negTokenInit.mechToken = unwrapped_out;
 663
 664                 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 665                         DEBUG(1, ("Failed to write NEG_TOKEN_INIT\n"));
 666                                 return NT_STATUS_INVALID_PARAMETER;
 667                 }
 668
 669                 /* set next state */
 670                 spnego_state->neg_oid = all_sec[i].oid;
 671
 672                 if (NT_STATUS_IS_OK(nt_status)) {
 673                         spnego_state->no_response_expected = true;
 674                 }
 675
 676                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 677         }
 678         talloc_free(spnego_state->sub_sec_security);
 679         spnego_state->sub_sec_security = NULL;
 680
 681         DEBUG(1, ("Failed to setup SPNEGO negTokenInit request: %s\n", nt_errstr(nt_status)));
 682         return NT_STATUS_INVALID_PARAMETER;
 683 }
 684
 685
 686 /** create a server negTokenTarg
 687  *
 688  * This is the case, where the client is the first one who sends data
 689 */
 690
 691 static NTSTATUS gensec_spnego_server_negTokenTarg(struct gensec_security *gensec_security,
 692                                                   struct spnego_state *spnego_state,
 693                                                   TALLOC_CTX *out_mem_ctx,
 694                                                   NTSTATUS nt_status,
 695                                                   const DATA_BLOB unwrapped_out,
 696                                                   DATA_BLOB mech_list_mic,
 697                                                   DATA_BLOB *out)
 698 {
 699         struct spnego_data spnego_out;
 700         DATA_BLOB null_data_blob = data_blob(NULL, 0);
 701
 702         /* compose reply */
 703         spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
 704         spnego_out.negTokenTarg.responseToken = unwrapped_out;
 705         spnego_out.negTokenTarg.mechListMIC = null_data_blob;
 706         spnego_out.negTokenTarg.supportedMech = NULL;
 707
 708         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 709                 spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
 710                 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
 711                 spnego_state->state_position = SPNEGO_SERVER_TARG;
 712         } else if (NT_STATUS_IS_OK(nt_status)) {
 713                 if (unwrapped_out.data) {
 714                         spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
 715                 }
 716                 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
 717                 spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
 718                 spnego_state->state_position = SPNEGO_DONE;
 719         } else {
 720                 spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
 721                 DEBUG(2, ("SPNEGO login failed: %s\n", nt_errstr(nt_status)));
 722                 spnego_state->state_position = SPNEGO_DONE;
 723         }
 724
 725         if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 726                 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
 727                 return NT_STATUS_INVALID_PARAMETER;
 728         }
 729
 730         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 731
 732         return nt_status;
 733 }
 734
 735
 736 static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
 737                                      const DATA_BLOB in, DATA_BLOB *out)
 738 {
 739         struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
 740         DATA_BLOB null_data_blob = data_blob(NULL, 0);
 741         DATA_BLOB mech_list_mic = data_blob(NULL, 0);
 742         DATA_BLOB unwrapped_out = data_blob(NULL, 0);
 743         struct spnego_data spnego_out;
 744         struct spnego_data spnego;
 745
 746         ssize_t len;
 747
 748         *out = data_blob(NULL, 0);
 749
 750         if (!out_mem_ctx) {
 751                 out_mem_ctx = spnego_state;
 752         }
 753
 754         /* and switch into the state machine */
 755
 756         switch (spnego_state->state_position) {
 757         case SPNEGO_FALLBACK:
 758                 return gensec_update(spnego_state->sub_sec_security,
 759                                      out_mem_ctx, in, out);
 760         case SPNEGO_SERVER_START:
 761         {
 762                 NTSTATUS nt_status;
 763                 if (in.length) {
 764
 765                         len = spnego_read_data(gensec_security, in, &spnego);
 766                         if (len == -1) {
 767                                 return gensec_spnego_server_try_fallback(gensec_security, spnego_state,
 768                                                                          out_mem_ctx, in, out);
 769                         }
 770                         /* client sent NegTargetInit, we send NegTokenTarg */
 771
 772                         /* OK, so it's real SPNEGO, check the packet's the one we expect */
 773                         if (spnego.type != spnego_state->expected_packet) {
 774                                 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 775                                           spnego_state->expected_packet));
 776                                 dump_data(1, in.data, in.length);
 777                                 spnego_free_data(&spnego);
 778                                 return NT_STATUS_INVALID_PARAMETER;
 779                         }
 780
 781                         nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
 782                                                                      spnego_state,
 783                                                                      out_mem_ctx,
 784                                                                      spnego.negTokenInit.mechTypes,
 785                                                                      spnego.negTokenInit.mechToken,
 786                                                                      &unwrapped_out);
 787
 788                         nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
 789                                                                       spnego_state,
 790                                                                       out_mem_ctx,
 791                                                                       nt_status,
 792                                                                       unwrapped_out,
 793                                                                       null_data_blob,
 794                                                                       out);
 795
 796                         spnego_free_data(&spnego);
 797
 798                         return nt_status;
 799                 } else {
 800                         nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
 801                                                                       out_mem_ctx, in, out);
 802                         spnego_state->state_position = SPNEGO_SERVER_START;
 803                         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
 804                         return nt_status;
 805                 }
 806         }
 807
 808         case SPNEGO_CLIENT_START:
 809         {
 810                 /* The server offers a list of mechanisms */
 811
 812                 const char *my_mechs[] = {NULL, NULL};
 813                 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
 814
 815                 if (!in.length) {
 816                         /* client to produce negTokenInit */
 817                         nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
 818                                                                  out_mem_ctx, in, out);
 819                         spnego_state->state_position = SPNEGO_CLIENT_TARG;
 820                         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 821                         return nt_status;
 822                 }
 823
 824                 len = spnego_read_data(gensec_security, in, &spnego);
 825
 826                 if (len == -1) {
 827                         DEBUG(1, ("Invalid SPNEGO request:\n"));
 828                         dump_data(1, in.data, in.length);
 829                         return NT_STATUS_INVALID_PARAMETER;
 830                 }
 831
 832                 /* OK, so it's real SPNEGO, check the packet's the one we expect */
 833                 if (spnego.type != spnego_state->expected_packet) {
 834                         DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 835                                   spnego_state->expected_packet));
 836                         dump_data(1, in.data, in.length);
 837                         spnego_free_data(&spnego);
 838                         return NT_STATUS_INVALID_PARAMETER;
 839                 }
 840
 841                 if (spnego.negTokenInit.targetPrincipal
 842                     && strcmp(spnego.negTokenInit.targetPrincipal, ADS_IGNORE_PRINCIPAL) != 0) {
 843                         DEBUG(5, ("Server claims it's principal name is %s\n", spnego.negTokenInit.targetPrincipal));
 844                         if (lpcfg_client_use_spnego_principal(gensec_security->settings->lp_ctx)) {
 845                                 gensec_set_target_principal(gensec_security, spnego.negTokenInit.targetPrincipal);
 846                         }
 847                 }
 848
 849                 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
 850                                                              spnego_state,
 851                                                              out_mem_ctx,
 852                                                              spnego.negTokenInit.mechTypes,
 853                                                              spnego.negTokenInit.mechToken,
 854                                                              &unwrapped_out);
 855
 856                 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
 857                         spnego_free_data(&spnego);
 858                         return nt_status;
 859                 }
 860
 861                 my_mechs[0] = spnego_state->neg_oid;
 862                 /* compose reply */
 863                 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
 864                 spnego_out.negTokenInit.mechTypes = my_mechs;
 865                 spnego_out.negTokenInit.reqFlags = null_data_blob;
 866                 spnego_out.negTokenInit.reqFlagsPadding = 0;
 867                 spnego_out.negTokenInit.mechListMIC = null_data_blob;
 868                 spnego_out.negTokenInit.mechToken = unwrapped_out;
 869
 870                 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 871                         DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
 872                                 return NT_STATUS_INVALID_PARAMETER;
 873                 }
 874
 875                 /* set next state */
 876                 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 877                 spnego_state->state_position = SPNEGO_CLIENT_TARG;
 878
 879                 if (NT_STATUS_IS_OK(nt_status)) {
 880                         spnego_state->no_response_expected = true;
 881                 }
 882
 883                 spnego_free_data(&spnego);
 884                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 885         }
 886         case SPNEGO_SERVER_TARG:
 887         {
 888                 NTSTATUS nt_status;
 889                 bool new_spnego = false;
 890
 891                 if (!in.length) {
 892                         return NT_STATUS_INVALID_PARAMETER;
 893                 }
 894
 895                 len = spnego_read_data(gensec_security, in, &spnego);
 896
 897                 if (len == -1) {
 898                         DEBUG(1, ("Invalid SPNEGO request:\n"));
 899                         dump_data(1, in.data, in.length);
 900                         return NT_STATUS_INVALID_PARAMETER;
 901                 }
 902
 903                 /* OK, so it's real SPNEGO, check the packet's the one we expect */
 904                 if (spnego.type != spnego_state->expected_packet) {
 905                         DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 906                                   spnego_state->expected_packet));
 907                         dump_data(1, in.data, in.length);
 908                         spnego_free_data(&spnego);
 909                         return NT_STATUS_INVALID_PARAMETER;
 910                 }
 911
 912                 if (!spnego_state->sub_sec_security) {
 913                         DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
 914                         spnego_free_data(&spnego);
 915                         return NT_STATUS_INVALID_PARAMETER;
 916                 }
 917
 918                 nt_status = gensec_update(spnego_state->sub_sec_security,
 919                                           out_mem_ctx,
 920                                           spnego.negTokenTarg.responseToken,
 921                                           &unwrapped_out);
 922                 if (NT_STATUS_IS_OK(nt_status) && spnego.negTokenTarg.mechListMIC.length > 0) {
 923                         new_spnego = true;
 924                         nt_status = gensec_check_packet(spnego_state->sub_sec_security,
 925                                                         spnego_state->mech_types.data,
 926                                                         spnego_state->mech_types.length,
 927                                                         spnego_state->mech_types.data,
 928                                                         spnego_state->mech_types.length,
 929                                                         &spnego.negTokenTarg.mechListMIC);
 930                         if (!NT_STATUS_IS_OK(nt_status)) {
 931                                 DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
 932                                         nt_errstr(nt_status)));
 933                         }
 934                 }
 935                 if (NT_STATUS_IS_OK(nt_status) && new_spnego) {
 936                         nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
 937                                                        out_mem_ctx,
 938                                                        spnego_state->mech_types.data,
 939                                                        spnego_state->mech_types.length,
 940                                                        spnego_state->mech_types.data,
 941                                                        spnego_state->mech_types.length,
 942                                                        &mech_list_mic);
 943                         if (!NT_STATUS_IS_OK(nt_status)) {
 944                                 DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
 945                                         nt_errstr(nt_status)));
 946                         }
 947                 }
 948
 949                 nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
 950                                                               spnego_state,
 951                                                               out_mem_ctx,
 952                                                               nt_status,
 953                                                               unwrapped_out,
 954                                                               mech_list_mic,
 955                                                               out);
 956
 957                 spnego_free_data(&spnego);
 958
 959                 return nt_status;
 960         }
 961         case SPNEGO_CLIENT_TARG:
 962         {
 963                 NTSTATUS nt_status;
 964                 if (!in.length) {
 965                         return NT_STATUS_INVALID_PARAMETER;
 966                 }
 967
 968                 len = spnego_read_data(gensec_security, in, &spnego);
 969
 970                 if (len == -1) {
 971                         DEBUG(1, ("Invalid SPNEGO request:\n"));
 972                         dump_data(1, in.data, in.length);
 973                         return NT_STATUS_INVALID_PARAMETER;
 974                 }
 975
 976                 /* OK, so it's real SPNEGO, check the packet's the one we expect */
 977                 if (spnego.type != spnego_state->expected_packet) {
 978                         DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 979                                   spnego_state->expected_packet));
 980                         dump_data(1, in.data, in.length);
 981                         spnego_free_data(&spnego);
 982                         return NT_STATUS_INVALID_PARAMETER;
 983                 }
 984
 985                 if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
 986                         spnego_free_data(&spnego);
 987                         return NT_STATUS_ACCESS_DENIED;
 988                 }
 989
 990                 /* Server didn't like our choice of mech, and chose something else */
 991                 if ((spnego.negTokenTarg.negResult == SPNEGO_ACCEPT_INCOMPLETE) &&
 992                     spnego.negTokenTarg.supportedMech &&
 993                     strcmp(spnego.negTokenTarg.supportedMech, spnego_state->neg_oid) != 0) {
 994                         DEBUG(3,("GENSEC SPNEGO: client preferred mech (%s) not accepted, server wants: %s\n",
 995                                  gensec_get_name_by_oid(gensec_security, spnego.negTokenTarg.supportedMech),
 996                                  gensec_get_name_by_oid(gensec_security, spnego_state->neg_oid)));
 997
 998                         talloc_free(spnego_state->sub_sec_security);
 999                         nt_status = gensec_subcontext_start(spnego_state,
1000                                                             gensec_security,
1001                                                             &spnego_state->sub_sec_security);
1002                         if (!NT_STATUS_IS_OK(nt_status)) {
1003                                 spnego_free_data(&spnego);
1004                                 return nt_status;
1005                         }
1006                         /* select the sub context */
1007                         nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
1008                                                              spnego.negTokenTarg.supportedMech);
1009                         if (!NT_STATUS_IS_OK(nt_status)) {
1010                                 spnego_free_data(&spnego);
1011                                 return nt_status;
1012                         }
1013
1014                         nt_status = gensec_update(spnego_state->sub_sec_security,
1015                                                   out_mem_ctx,
1016                                                   spnego.negTokenTarg.responseToken,
1017                                                   &unwrapped_out);
1018                         spnego_state->neg_oid = talloc_strdup(spnego_state, spnego.negTokenTarg.supportedMech);
1019                 } else if (spnego_state->no_response_expected) {
1020                         if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
1021                                 DEBUG(3,("GENSEC SPNEGO: client GENSEC accepted, but server rejected (bad password?)\n"));
1022                                 nt_status = NT_STATUS_INVALID_PARAMETER;
1023                         } else if (spnego.negTokenTarg.responseToken.length) {
1024                                 DEBUG(2,("GENSEC SPNEGO: client GENSEC accepted, but server continued negotiation!\n"));
1025                                 nt_status = NT_STATUS_INVALID_PARAMETER;
1026                         } else {
1027                                 nt_status = NT_STATUS_OK;
1028                         }
1029                         if (NT_STATUS_IS_OK(nt_status) && spnego.negTokenTarg.mechListMIC.length > 0) {
1030                                 nt_status = gensec_check_packet(spnego_state->sub_sec_security,
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 }