source4/libcli/auth/spnego.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    RFC2478 Compliant SPNEGO implementation
   5
   6    Copyright (C) Jim McDonough <jmcd@us.ibm.com>      2003
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "includes.h"
  26 #include "auth/auth.h"
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_AUTH
  30
  31 enum spnego_state_position {
  32         SPNEGO_SERVER_START,
  33         SPNEGO_CLIENT_START,
  34         SPNEGO_SERVER_TARG,
  35         SPNEGO_CLIENT_TARG,
  36         SPNEGO_FALLBACK,
  37         SPNEGO_DONE
  38 };
  39
  40 struct spnego_state {
  41         uint_t ref_count;
  42         enum spnego_message_type expected_packet;
  43         enum spnego_state_position state_position;
  44         struct gensec_security *sub_sec_security;
  45 };
  46
  47
  48 static int gensec_spnego_destroy(void *ptr)
  49 {
  50         struct spnego_state *spnego_state = ptr;
  51
  52         if (spnego_state->sub_sec_security) {
  53                 gensec_end(&spnego_state->sub_sec_security);
  54         }
  55         return 0;
  56 }
  57
  58 static NTSTATUS gensec_spnego_client_start(struct gensec_security *gensec_security)
  59 {
  60         struct spnego_state *spnego_state;
  61
  62         spnego_state = talloc_p(gensec_security, struct spnego_state);
  63         if (!spnego_state) {
  64                 return NT_STATUS_NO_MEMORY;
  65         }
  66
  67         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
  68         spnego_state->state_position = SPNEGO_CLIENT_START;
  69         spnego_state->sub_sec_security = NULL;
  70
  71         talloc_set_destructor(spnego_state, gensec_spnego_destroy);
  72
  73         gensec_security->private_data = spnego_state;
  74         return NT_STATUS_OK;
  75 }
  76
  77 static NTSTATUS gensec_spnego_server_start(struct gensec_security *gensec_security)
  78 {
  79         struct spnego_state *spnego_state;
  80
  81         spnego_state = talloc_p(gensec_security, struct spnego_state);
  82         if (!spnego_state) {
  83                 return NT_STATUS_NO_MEMORY;
  84         }
  85
  86         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
  87         spnego_state->state_position = SPNEGO_SERVER_START;
  88         spnego_state->sub_sec_security = NULL;
  89
  90         talloc_set_destructor(spnego_state, gensec_spnego_destroy);
  91
  92         gensec_security->private_data = spnego_state;
  93         return NT_STATUS_OK;
  94 }
  95
  96 /*
  97   wrappers for the spnego_*() functions
  98 */
  99 static NTSTATUS gensec_spnego_unseal_packet(struct gensec_security *gensec_security,
 100                                             TALLOC_CTX *mem_ctx,
 101                                             uint8_t *data, size_t length,
 102                                             const uint8_t *whole_pdu, size_t pdu_length,
 103                                             DATA_BLOB *sig)
 104 {
 105         struct spnego_state *spnego_state = gensec_security->private_data;
 106
 107         if (spnego_state->state_position != SPNEGO_DONE
 108             && spnego_state->state_position != SPNEGO_FALLBACK) {
 109                 return NT_STATUS_INVALID_PARAMETER;
 110         }
 111
 112         return gensec_unseal_packet(spnego_state->sub_sec_security,
 113                                     mem_ctx,
 114                                     data, length,
 115                                     whole_pdu, pdu_length,
 116                                     sig);
 117 }
 118
 119 static NTSTATUS gensec_spnego_check_packet(struct gensec_security *gensec_security,
 120                                            TALLOC_CTX *mem_ctx,
 121                                            const uint8_t *data, size_t length,
 122                                            const uint8_t *whole_pdu, size_t pdu_length,
 123                                            const DATA_BLOB *sig)
 124 {
 125         struct spnego_state *spnego_state = gensec_security->private_data;
 126
 127         if (spnego_state->state_position != SPNEGO_DONE
 128             && spnego_state->state_position != SPNEGO_FALLBACK) {
 129                 return NT_STATUS_INVALID_PARAMETER;
 130         }
 131
 132         return gensec_check_packet(spnego_state->sub_sec_security,
 133                                    mem_ctx,
 134                                    data, length,
 135                                    whole_pdu, pdu_length,
 136                                    sig);
 137 }
 138
 139 static NTSTATUS gensec_spnego_seal_packet(struct gensec_security *gensec_security,
 140                                           TALLOC_CTX *mem_ctx,
 141                                           uint8_t *data, size_t length,
 142                                           const uint8_t *whole_pdu, size_t pdu_length,
 143                                           DATA_BLOB *sig)
 144 {
 145         struct spnego_state *spnego_state = gensec_security->private_data;
 146
 147         if (spnego_state->state_position != SPNEGO_DONE
 148             && spnego_state->state_position != SPNEGO_FALLBACK) {
 149                 return NT_STATUS_INVALID_PARAMETER;
 150         }
 151
 152         return gensec_seal_packet(spnego_state->sub_sec_security,
 153                                   mem_ctx,
 154                                   data, length,
 155                                   whole_pdu, pdu_length,
 156                                   sig);
 157 }
 158
 159 static NTSTATUS gensec_spnego_sign_packet(struct gensec_security *gensec_security,
 160                                           TALLOC_CTX *mem_ctx,
 161                                           const uint8_t *data, size_t length,
 162                                           const uint8_t *whole_pdu, size_t pdu_length,
 163                                           DATA_BLOB *sig)
 164 {
 165         struct spnego_state *spnego_state = gensec_security->private_data;
 166
 167         if (spnego_state->state_position != SPNEGO_DONE
 168             && spnego_state->state_position != SPNEGO_FALLBACK) {
 169                 return NT_STATUS_INVALID_PARAMETER;
 170         }
 171
 172         return gensec_sign_packet(spnego_state->sub_sec_security,
 173                                   mem_ctx,
 174                                   data, length,
 175                                   whole_pdu, pdu_length,
 176                                   sig);
 177 }
 178
 179 static size_t gensec_spnego_sig_size(struct gensec_security *gensec_security)
 180 {
 181         struct spnego_state *spnego_state = gensec_security->private_data;
 182
 183         if (spnego_state->state_position != SPNEGO_DONE
 184             && spnego_state->state_position != SPNEGO_FALLBACK) {
 185                 return 0;
 186         }
 187
 188         return gensec_sig_size(spnego_state->sub_sec_security);
 189 }
 190
 191 static NTSTATUS gensec_spnego_session_key(struct gensec_security *gensec_security,
 192                                           DATA_BLOB *session_key)
 193 {
 194         struct spnego_state *spnego_state = gensec_security->private_data;
 195         if (!spnego_state->sub_sec_security) {
 196                 return NT_STATUS_INVALID_PARAMETER;
 197         }
 198
 199         return gensec_session_key(spnego_state->sub_sec_security,
 200                                   session_key);
 201 }
 202
 203 static NTSTATUS gensec_spnego_session_info(struct gensec_security *gensec_security,
 204                                                                       struct auth_session_info **session_info)
 205 {
 206         struct spnego_state *spnego_state = gensec_security->private_data;
 207         if (!spnego_state->sub_sec_security) {
 208                 return NT_STATUS_INVALID_PARAMETER;
 209         }
 210
 211         return gensec_session_info(spnego_state->sub_sec_security,
 212                                    session_info);
 213 }
 214
 215 /** Fallback to another GENSEC mechanism, based on magic strings
 216  *
 217  * This is the 'fallback' case, where we don't get SPNEGO, and have to
 218  * try all the other options (and hope they all have a magic string
 219  * they check)
 220 */
 221
 222 static NTSTATUS gensec_spnego_server_try_fallback(struct gensec_security *gensec_security,
 223                                                   struct spnego_state *spnego_state,
 224                                                   TALLOC_CTX *out_mem_ctx,
 225                                                   const DATA_BLOB in, DATA_BLOB *out)
 226 {
 227         int i;
 228         int num_ops;
 229         const struct gensec_security_ops **all_ops = gensec_security_all(&num_ops);
 230         for (i=0; i < num_ops; i++) {
 231                 NTSTATUS nt_status;
 232                 if (!all_ops[i]->oid) {
 233                         continue;
 234                 }
 235                 if (strcasecmp(GENSEC_OID_SPNEGO,all_ops[i]->oid) == 0) {
 236                         continue;
 237                 }
 238
 239                 nt_status = gensec_subcontext_start(spnego_state,
 240                                                     gensec_security,
 241                                                     &spnego_state->sub_sec_security);
 242                 if (!NT_STATUS_IS_OK(nt_status)) {
 243                         return nt_status;
 244                 }
 245                 /* select the sub context */
 246                 nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
 247                                                      all_ops[i]->oid);
 248                 if (!NT_STATUS_IS_OK(nt_status)) {
 249                         gensec_end(&spnego_state->sub_sec_security);
 250                                         continue;
 251                 }
 252                 nt_status = gensec_update(spnego_state->sub_sec_security,
 253                                                           out_mem_ctx, in, out);
 254                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 255                         spnego_state->state_position = SPNEGO_FALLBACK;
 256                         return nt_status;
 257                 }
 258                 gensec_end(&spnego_state->sub_sec_security);
 259         }
 260         DEBUG(1, ("Failed to parse SPNEGO request\n"));
 261         return NT_STATUS_INVALID_PARAMETER;
 262
 263 }
 264
 265 static NTSTATUS gensec_spnego_parse_negTokenInit(struct gensec_security *gensec_security,
 266                                                  struct spnego_state *spnego_state,
 267                                                  TALLOC_CTX *out_mem_ctx,
 268                                                  const char **mechType,
 269                                                  const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out)
 270 {
 271         int i;
 272         NTSTATUS nt_status;
 273         DATA_BLOB null_data_blob = data_blob(NULL,0);
 274
 275         for (i=0; mechType && mechType[i]; i++) {
 276                 nt_status = gensec_subcontext_start(spnego_state,
 277                                                     gensec_security,
 278                                                     &spnego_state->sub_sec_security);
 279                 if (!NT_STATUS_IS_OK(nt_status)) {
 280                         break;
 281                 }
 282                 /* select the sub context */
 283                 nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
 284                                                      mechType[i]);
 285                 if (!NT_STATUS_IS_OK(nt_status)) {
 286                         gensec_end(&spnego_state->sub_sec_security);
 287                         continue;
 288                 }
 289
 290                 if (i == 0) {
 291                         nt_status = gensec_update(spnego_state->sub_sec_security,
 292                                                   out_mem_ctx,
 293                                                   unwrapped_in,
 294                                                   unwrapped_out);
 295                 } else {
 296                         /* only get the helping start blob for the first OID */
 297                         nt_status = gensec_update(spnego_state->sub_sec_security,
 298                                                   out_mem_ctx,
 299                                                   null_data_blob,
 300                                                   unwrapped_out);
 301                 }
 302                 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
 303                         DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
 304                                   spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
 305                         gensec_end(&spnego_state->sub_sec_security);
 306                 }
 307                 return nt_status;
 308         }
 309         if (!mechType || !mechType[i]) {
 310                 DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
 311         }
 312         return NT_STATUS_INVALID_PARAMETER;
 313 }
 314
 315 /** create a client negTokenInit
 316  *
 317  * This is the case, where the client is the first one who sends data
 318 */
 319
 320 static NTSTATUS gensec_spnego_client_negTokenInit(struct gensec_security *gensec_security,
 321                                                   struct spnego_state *spnego_state,
 322                                                   TALLOC_CTX *out_mem_ctx,
 323                                                   const DATA_BLOB in, DATA_BLOB *out)
 324 {
 325         DATA_BLOB null_data_blob = data_blob(NULL,0);
 326         NTSTATUS nt_status;
 327         const char **mechTypes = NULL;
 328         DATA_BLOB unwrapped_out = data_blob(NULL,0);
 329
 330         mechTypes = gensec_security_oids(out_mem_ctx, GENSEC_OID_SPNEGO);
 331
 332         if (!mechTypes) {
 333                 DEBUG(1, ("no GENSEC OID backends available\n"));
 334                 return NT_STATUS_INVALID_PARAMETER;
 335         }
 336
 337         nt_status = gensec_subcontext_start(spnego_state,
 338                                             gensec_security,
 339                                             &spnego_state->sub_sec_security);
 340         if (!NT_STATUS_IS_OK(nt_status)) {
 341                 return nt_status;
 342         }
 343         /* select our preferred mech */
 344         nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
 345                                              mechTypes[0]);
 346         if (!NT_STATUS_IS_OK(nt_status)) {
 347                 gensec_end(&spnego_state->sub_sec_security);
 348                         return nt_status;
 349         }
 350         nt_status = gensec_update(spnego_state->sub_sec_security,
 351                                   out_mem_ctx, in, &unwrapped_out);
 352         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 353                 struct spnego_data spnego_out;
 354                 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
 355                 spnego_out.negTokenInit.mechTypes = mechTypes;
 356                 spnego_out.negTokenInit.reqFlags = 0;
 357                 spnego_out.negTokenInit.mechListMIC = null_data_blob;
 358                 spnego_out.negTokenInit.mechToken = unwrapped_out;
 359
 360                 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 361                         DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
 362                                 return NT_STATUS_INVALID_PARAMETER;
 363                 }
 364
 365                 /* set next state */
 366                 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 367                 spnego_state->state_position = SPNEGO_CLIENT_TARG;
 368                 return nt_status;
 369         }
 370         gensec_end(&spnego_state->sub_sec_security);
 371
 372         DEBUG(1, ("Failed to setup SPNEGO netTokenInit request\n"));
 373         return NT_STATUS_INVALID_PARAMETER;
 374 }
 375
 376
 377 /** create a client negTokenTarg
 378  *
 379  * This is the case, where the client is the first one who sends data
 380 */
 381
 382 static NTSTATUS gensec_spnego_server_negTokenTarg(struct gensec_security *gensec_security,
 383                                                   struct spnego_state *spnego_state,
 384                                                   TALLOC_CTX *out_mem_ctx,
 385                                                   NTSTATUS nt_status,
 386                                                   const DATA_BLOB unwrapped_out, DATA_BLOB *out)
 387 {
 388         struct spnego_data spnego_out;
 389         DATA_BLOB null_data_blob = data_blob(NULL, 0);
 390
 391         /* compose reply */
 392         spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
 393         spnego_out.negTokenTarg.responseToken = unwrapped_out;
 394         spnego_out.negTokenTarg.mechListMIC = null_data_blob;
 395         spnego_out.negTokenTarg.supportedMech = NULL;
 396
 397         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 398                 spnego_out.negTokenTarg.supportedMech
 399                         = spnego_state->sub_sec_security->ops->oid;
 400                 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
 401                 spnego_state->state_position = SPNEGO_SERVER_TARG;
 402         } else if (NT_STATUS_IS_OK(nt_status)) {
 403                 if (unwrapped_out.data) {
 404                         spnego_out.negTokenTarg.supportedMech
 405                                 = spnego_state->sub_sec_security->ops->oid;
 406                 }
 407                 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
 408                 spnego_state->state_position = SPNEGO_DONE;
 409         } else {
 410                 spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
 411                 DEBUG(1, ("SPNEGO login failed: %s\n", nt_errstr(nt_status)));
 412                 spnego_state->state_position = SPNEGO_DONE;
 413         }
 414
 415         if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 416                 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
 417                 return NT_STATUS_INVALID_PARAMETER;
 418         }
 419
 420         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 421
 422         return nt_status;
 423 }
 424
 425
 426 static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
 427                                      const DATA_BLOB in, DATA_BLOB *out)
 428 {
 429         struct spnego_state *spnego_state = gensec_security->private_data;
 430         DATA_BLOB null_data_blob = data_blob(NULL, 0);
 431         DATA_BLOB unwrapped_out = data_blob(NULL, 0);
 432         struct spnego_data spnego_out;
 433         struct spnego_data spnego;
 434
 435         ssize_t len;
 436
 437         *out = data_blob(NULL, 0);
 438
 439         if (!out_mem_ctx) {
 440                 out_mem_ctx = spnego_state;
 441         }
 442
 443         /* and switch into the state machine */
 444
 445         switch (spnego_state->state_position) {
 446         case SPNEGO_FALLBACK:
 447                 return gensec_update(spnego_state->sub_sec_security,
 448                                      out_mem_ctx, in, out);
 449         case SPNEGO_SERVER_START:
 450         {
 451                 if (in.length) {
 452                         NTSTATUS nt_status;
 453
 454                         len = spnego_read_data(in, &spnego);
 455                         if (len == -1) {
 456                                 return gensec_spnego_server_try_fallback(gensec_security, spnego_state, out_mem_ctx, in, out);
 457                         }
 458                         /* client sent NegTargetInit, we send NegTokenTarg */
 459
 460                         /* OK, so it's real SPNEGO, check the packet's the one we expect */
 461                         if (spnego.type != spnego_state->expected_packet) {
 462                                 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 463                                           spnego_state->expected_packet));
 464                                 dump_data(1, in.data, in.length);
 465                                 spnego_free_data(&spnego);
 466                                 return NT_STATUS_INVALID_PARAMETER;
 467                         }
 468
 469                         nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
 470                                                                      spnego_state,
 471                                                                      out_mem_ctx,
 472                                                                      spnego.negTokenInit.mechTypes,
 473                                                                      spnego.negTokenInit.mechToken,
 474                                                                      &unwrapped_out);
 475
 476                         nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
 477                                                                       spnego_state,
 478                                                                       out_mem_ctx,
 479                                                                       nt_status,
 480                                                                       unwrapped_out,
 481                                                                       out);
 482
 483                         spnego_free_data(&spnego);
 484
 485                         return nt_status;
 486                 } else {
 487                         const char **mechlist = gensec_security_oids(out_mem_ctx, GENSEC_OID_SPNEGO);
 488
 489                         spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
 490                         spnego_out.negTokenInit.mechTypes = mechlist;
 491                         spnego_out.negTokenInit.reqFlags = 0;
 492                         spnego_out.negTokenInit.mechListMIC
 493                                 = data_blob_string_const(gensec_get_target_principal(gensec_security));
 494                         spnego_out.negTokenInit.mechToken = unwrapped_out;
 495
 496                         if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 497                                 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
 498                                 return NT_STATUS_INVALID_PARAMETER;
 499                         }
 500
 501                         /* set next state */
 502                         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 503                         spnego_state->state_position = SPNEGO_SERVER_TARG;
 504
 505                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 506                 }
 507         }
 508
 509         case SPNEGO_CLIENT_START:
 510         {
 511                 /* The server offers a list of mechanisms */
 512
 513                 const char *my_mechs[] = {NULL, NULL};
 514                 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
 515
 516                 if (!in.length) {
 517                         /* client to produce negTokenInit */
 518                         return gensec_spnego_client_negTokenInit(gensec_security, spnego_state, out_mem_ctx, in, out);
 519                 }
 520
 521                 len = spnego_read_data(in, &spnego);
 522
 523                 if (len == -1) {
 524                         DEBUG(1, ("Invalid SPNEGO request:\n"));
 525                         dump_data(1, in.data, in.length);
 526                         return NT_STATUS_INVALID_PARAMETER;
 527                 }
 528
 529                 /* OK, so it's real SPNEGO, check the packet's the one we expect */
 530                 if (spnego.type != spnego_state->expected_packet) {
 531                         DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 532                                   spnego_state->expected_packet));
 533                         dump_data(1, in.data, in.length);
 534                         spnego_free_data(&spnego);
 535                         return NT_STATUS_INVALID_PARAMETER;
 536                 }
 537
 538                 if (spnego.negTokenInit.targetPrincipal) {
 539                         DEBUG(5, ("Server claims it's principal name is %s\n", spnego.negTokenInit.targetPrincipal));
 540                         nt_status = gensec_set_target_principal(gensec_security,
 541                                                                 spnego.negTokenInit.targetPrincipal);
 542                         if (!NT_STATUS_IS_OK(nt_status)) {
 543                                 spnego_free_data(&spnego);
 544                                 return nt_status;
 545                         }
 546                 }
 547
 548                 nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
 549                                                              spnego_state,
 550                                                              out_mem_ctx,
 551                                                              spnego.negTokenInit.mechTypes,
 552                                                              spnego.negTokenInit.mechToken,
 553                                                              &unwrapped_out);
 554
 555                 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
 556                         spnego_free_data(&spnego);
 557                         return nt_status;
 558                 }
 559
 560                 /* compose reply */
 561                 my_mechs[0] = spnego_state->sub_sec_security->ops->oid;
 562
 563                 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
 564                 spnego_out.negTokenInit.mechTypes = my_mechs;
 565                 spnego_out.negTokenInit.reqFlags = 0;
 566                 spnego_out.negTokenInit.mechListMIC = null_data_blob;
 567                 spnego_out.negTokenInit.mechToken = unwrapped_out;
 568
 569                 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 570                         DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
 571                                 return NT_STATUS_INVALID_PARAMETER;
 572                 }
 573
 574                 /* set next state */
 575                 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 576                 spnego_state->state_position = SPNEGO_CLIENT_TARG;
 577
 578                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 579         }
 580         case SPNEGO_SERVER_TARG:
 581         {
 582                 NTSTATUS nt_status;
 583                 if (!in.length) {
 584                         return NT_STATUS_INVALID_PARAMETER;
 585                 }
 586
 587                 len = spnego_read_data(in, &spnego);
 588
 589                 if (len == -1) {
 590                         DEBUG(1, ("Invalid SPNEGO request:\n"));
 591                         dump_data(1, in.data, in.length);
 592                         return NT_STATUS_INVALID_PARAMETER;
 593                 }
 594
 595                 /* OK, so it's real SPNEGO, check the packet's the one we expect */
 596                 if (spnego.type != spnego_state->expected_packet) {
 597                         DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 598                                   spnego_state->expected_packet));
 599                         dump_data(1, in.data, in.length);
 600                         spnego_free_data(&spnego);
 601                         return NT_STATUS_INVALID_PARAMETER;
 602                 }
 603
 604                 nt_status = gensec_update(spnego_state->sub_sec_security,
 605                                           out_mem_ctx,
 606                                           spnego.negTokenTarg.responseToken,
 607                                           &unwrapped_out);
 608
 609                 nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
 610                                                               spnego_state,
 611                                                               out_mem_ctx,
 612                                                               nt_status,
 613                                                               unwrapped_out,
 614                                                               out);
 615
 616                 spnego_free_data(&spnego);
 617
 618                 return nt_status;
 619         }
 620         case SPNEGO_CLIENT_TARG:
 621         {
 622                 NTSTATUS nt_status;
 623                 if (!in.length) {
 624                         return NT_STATUS_INVALID_PARAMETER;
 625                 }
 626
 627                 len = spnego_read_data(in, &spnego);
 628
 629                 if (len == -1) {
 630                         DEBUG(1, ("Invalid SPNEGO request:\n"));
 631                         dump_data(1, in.data, in.length);
 632                         return NT_STATUS_INVALID_PARAMETER;
 633                 }
 634
 635                 /* OK, so it's real SPNEGO, check the packet's the one we expect */
 636                 if (spnego.type != spnego_state->expected_packet) {
 637                         DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 638                                   spnego_state->expected_packet));
 639                         dump_data(1, in.data, in.length);
 640                         spnego_free_data(&spnego);
 641                         return NT_STATUS_INVALID_PARAMETER;
 642                 }
 643
 644                 if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
 645                         return NT_STATUS_ACCESS_DENIED;
 646                 }
 647
 648                 nt_status = gensec_update(spnego_state->sub_sec_security,
 649                                           out_mem_ctx,
 650                                           spnego.negTokenTarg.responseToken,
 651                                           &unwrapped_out);
 652
 653
 654                 if (NT_STATUS_IS_OK(nt_status)
 655                     && (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED)) {
 656                         DEBUG(1,("gensec_update ok but not accepted\n"));
 657                         nt_status = NT_STATUS_INVALID_PARAMETER;
 658                 }
 659
 660                 spnego_free_data(&spnego);
 661
 662                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 663                         /* compose reply */
 664                         spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
 665                         spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
 666                         spnego_out.negTokenTarg.supportedMech = NULL;
 667                         spnego_out.negTokenTarg.responseToken = unwrapped_out;
 668                         spnego_out.negTokenTarg.mechListMIC = null_data_blob;
 669
 670                         if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 671                                 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
 672                                 return NT_STATUS_INVALID_PARAMETER;
 673                         }
 674
 675                         spnego_state->state_position = SPNEGO_CLIENT_TARG;
 676                 } else if (NT_STATUS_IS_OK(nt_status)) {
 677                         /* all done - server has accepted, and we agree */
 678
 679                         if (unwrapped_out.length) {
 680                                 spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
 681                                 spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
 682                                 spnego_out.negTokenTarg.supportedMech = NULL;
 683                                 spnego_out.negTokenTarg.responseToken = unwrapped_out;
 684                                 spnego_out.negTokenTarg.mechListMIC = null_data_blob;
 685
 686                                 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 687                                         DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
 688                                         return NT_STATUS_INVALID_PARAMETER;
 689                                 }
 690                         } else {
 691                                 *out = null_data_blob;
 692                         }
 693
 694                         spnego_state->state_position = SPNEGO_DONE;
 695                 } else {
 696                         DEBUG(1, ("SPNEGO(%s) login failed: %s\n",
 697                                   spnego_state->sub_sec_security->ops->name,
 698                                   nt_errstr(nt_status)));
 699                 }
 700                 return nt_status;
 701         }
 702         case SPNEGO_DONE:
 703                 return NT_STATUS_OK;
 704         }
 705         return NT_STATUS_INVALID_PARAMETER;
 706 }
 707
 708 static const struct gensec_security_ops gensec_spnego_security_ops = {
 709         .name           = "spnego",
 710         .sasl_name      = "GSS-SPNEGO",
 711         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
 712         .oid            = GENSEC_OID_SPNEGO,
 713         .client_start   = gensec_spnego_client_start,
 714         .server_start   = gensec_spnego_server_start,
 715         .update         = gensec_spnego_update,
 716         .seal_packet    = gensec_spnego_seal_packet,
 717         .sign_packet    = gensec_spnego_sign_packet,
 718         .sig_size       = gensec_spnego_sig_size,
 719         .check_packet   = gensec_spnego_check_packet,
 720         .unseal_packet  = gensec_spnego_unseal_packet,
 721         .session_key    = gensec_spnego_session_key,
 722         .session_info   = gensec_spnego_session_info,
 723 };
 724
 725 NTSTATUS gensec_spnego_init(void)
 726 {
 727         NTSTATUS ret;
 728         ret = gensec_register(&gensec_spnego_security_ops);
 729         if (!NT_STATUS_IS_OK(ret)) {
 730                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 731                         gensec_spnego_security_ops.name));
 732                 return ret;
 733         }
 734
 735         return ret;
 736 }