source/auth/gensec/spnego.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    RFC2478 Compliant SPNEGO implementation
   5
   6    Copyright (C) Jim McDonough <jmcd@us.ibm.com>      2003
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
   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         BOOL no_response_expected;
  46 };
  47
  48
  49 static NTSTATUS gensec_spnego_client_start(struct gensec_security *gensec_security)
  50 {
  51         struct spnego_state *spnego_state;
  52
  53         spnego_state = talloc(gensec_security, struct spnego_state);
  54         if (!spnego_state) {
  55                 return NT_STATUS_NO_MEMORY;
  56         }
  57
  58         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
  59         spnego_state->state_position = SPNEGO_CLIENT_START;
  60         spnego_state->sub_sec_security = NULL;
  61         spnego_state->no_response_expected = False;
  62
  63         gensec_security->private_data = spnego_state;
  64         return NT_STATUS_OK;
  65 }
  66
  67 static NTSTATUS gensec_spnego_server_start(struct gensec_security *gensec_security)
  68 {
  69         struct spnego_state *spnego_state;
  70
  71         spnego_state = talloc(gensec_security, struct spnego_state);
  72         if (!spnego_state) {
  73                 return NT_STATUS_NO_MEMORY;
  74         }
  75
  76         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
  77         spnego_state->state_position = SPNEGO_SERVER_START;
  78         spnego_state->sub_sec_security = NULL;
  79         spnego_state->no_response_expected = False;
  80
  81         gensec_security->private_data = spnego_state;
  82         return NT_STATUS_OK;
  83 }
  84
  85 /*
  86   wrappers for the spnego_*() functions
  87 */
  88 static NTSTATUS gensec_spnego_unseal_packet(struct gensec_security *gensec_security,
  89                                             TALLOC_CTX *mem_ctx,
  90                                             uint8_t *data, size_t length,
  91                                             const uint8_t *whole_pdu, size_t pdu_length,
  92                                             const DATA_BLOB *sig)
  93 {
  94         struct spnego_state *spnego_state = gensec_security->private_data;
  95
  96         if (spnego_state->state_position != SPNEGO_DONE
  97             && spnego_state->state_position != SPNEGO_FALLBACK) {
  98                 return NT_STATUS_INVALID_PARAMETER;
  99         }
 100
 101         return gensec_unseal_packet(spnego_state->sub_sec_security,
 102                                     mem_ctx,
 103                                     data, length,
 104                                     whole_pdu, pdu_length,
 105                                     sig);
 106 }
 107
 108 static NTSTATUS gensec_spnego_check_packet(struct gensec_security *gensec_security,
 109                                            TALLOC_CTX *mem_ctx,
 110                                            const uint8_t *data, size_t length,
 111                                            const uint8_t *whole_pdu, size_t pdu_length,
 112                                            const DATA_BLOB *sig)
 113 {
 114         struct spnego_state *spnego_state = gensec_security->private_data;
 115
 116         if (spnego_state->state_position != SPNEGO_DONE
 117             && spnego_state->state_position != SPNEGO_FALLBACK) {
 118                 return NT_STATUS_INVALID_PARAMETER;
 119         }
 120
 121         return gensec_check_packet(spnego_state->sub_sec_security,
 122                                    mem_ctx,
 123                                    data, length,
 124                                    whole_pdu, pdu_length,
 125                                    sig);
 126 }
 127
 128 static NTSTATUS gensec_spnego_seal_packet(struct gensec_security *gensec_security,
 129                                           TALLOC_CTX *mem_ctx,
 130                                           uint8_t *data, size_t length,
 131                                           const uint8_t *whole_pdu, size_t pdu_length,
 132                                           DATA_BLOB *sig)
 133 {
 134         struct spnego_state *spnego_state = gensec_security->private_data;
 135
 136         if (spnego_state->state_position != SPNEGO_DONE
 137             && spnego_state->state_position != SPNEGO_FALLBACK) {
 138                 return NT_STATUS_INVALID_PARAMETER;
 139         }
 140
 141         return gensec_seal_packet(spnego_state->sub_sec_security,
 142                                   mem_ctx,
 143                                   data, length,
 144                                   whole_pdu, pdu_length,
 145                                   sig);
 146 }
 147
 148 static NTSTATUS gensec_spnego_sign_packet(struct gensec_security *gensec_security,
 149                                           TALLOC_CTX *mem_ctx,
 150                                           const uint8_t *data, size_t length,
 151                                           const uint8_t *whole_pdu, size_t pdu_length,
 152                                           DATA_BLOB *sig)
 153 {
 154         struct spnego_state *spnego_state = gensec_security->private_data;
 155
 156         if (spnego_state->state_position != SPNEGO_DONE
 157             && spnego_state->state_position != SPNEGO_FALLBACK) {
 158                 return NT_STATUS_INVALID_PARAMETER;
 159         }
 160
 161         return gensec_sign_packet(spnego_state->sub_sec_security,
 162                                   mem_ctx,
 163                                   data, length,
 164                                   whole_pdu, pdu_length,
 165                                   sig);
 166 }
 167
 168 static NTSTATUS gensec_spnego_wrap(struct gensec_security *gensec_security,
 169                                    TALLOC_CTX *mem_ctx,
 170                                    const DATA_BLOB *in,
 171                                    DATA_BLOB *out)
 172 {
 173         struct spnego_state *spnego_state = gensec_security->private_data;
 174
 175         if (spnego_state->state_position != SPNEGO_DONE
 176             && spnego_state->state_position != SPNEGO_FALLBACK) {
 177                 DEBUG(1, ("gensec_spnego_wrap: wrong state for wrap\n"));
 178                 return NT_STATUS_INVALID_PARAMETER;
 179         }
 180
 181         return gensec_wrap(spnego_state->sub_sec_security,
 182                            mem_ctx, in, out);
 183 }
 184
 185 static NTSTATUS gensec_spnego_unwrap(struct gensec_security *gensec_security,
 186                                      TALLOC_CTX *mem_ctx,
 187                                      const DATA_BLOB *in,
 188                                      DATA_BLOB *out)
 189 {
 190         struct spnego_state *spnego_state = gensec_security->private_data;
 191
 192         if (spnego_state->state_position != SPNEGO_DONE
 193             && spnego_state->state_position != SPNEGO_FALLBACK) {
 194                 DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
 195                 return NT_STATUS_INVALID_PARAMETER;
 196         }
 197
 198         return gensec_unwrap(spnego_state->sub_sec_security,
 199                              mem_ctx, in, out);
 200 }
 201
 202 static size_t gensec_spnego_sig_size(struct gensec_security *gensec_security)
 203 {
 204         struct spnego_state *spnego_state = gensec_security->private_data;
 205
 206         if (spnego_state->state_position != SPNEGO_DONE
 207             && spnego_state->state_position != SPNEGO_FALLBACK) {
 208                 return 0;
 209         }
 210
 211         return gensec_sig_size(spnego_state->sub_sec_security);
 212 }
 213
 214 static NTSTATUS gensec_spnego_session_key(struct gensec_security *gensec_security,
 215                                           DATA_BLOB *session_key)
 216 {
 217         struct spnego_state *spnego_state = gensec_security->private_data;
 218         if (!spnego_state->sub_sec_security) {
 219                 return NT_STATUS_INVALID_PARAMETER;
 220         }
 221
 222         return gensec_session_key(spnego_state->sub_sec_security,
 223                                   session_key);
 224 }
 225
 226 static NTSTATUS gensec_spnego_session_info(struct gensec_security *gensec_security,
 227                                                                       struct auth_session_info **session_info)
 228 {
 229         struct spnego_state *spnego_state = gensec_security->private_data;
 230         if (!spnego_state->sub_sec_security) {
 231                 return NT_STATUS_INVALID_PARAMETER;
 232         }
 233
 234         return gensec_session_info(spnego_state->sub_sec_security,
 235                                    session_info);
 236 }
 237
 238 /** Fallback to another GENSEC mechanism, based on magic strings
 239  *
 240  * This is the 'fallback' case, where we don't get SPNEGO, and have to
 241  * try all the other options (and hope they all have a magic string
 242  * they check)
 243 */
 244
 245 static NTSTATUS gensec_spnego_server_try_fallback(struct gensec_security *gensec_security,
 246                                                   struct spnego_state *spnego_state,
 247                                                   TALLOC_CTX *out_mem_ctx,
 248                                                   const DATA_BLOB in, DATA_BLOB *out)
 249 {
 250         int i;
 251         int num_ops;
 252         const struct gensec_security_ops **all_ops = gensec_security_all(&num_ops);
 253         for (i=0; i < num_ops; i++) {
 254                 NTSTATUS nt_status;
 255                 if (!all_ops[i]->oid) {
 256                         continue;
 257                 }
 258                 if (strcasecmp(GENSEC_OID_SPNEGO,all_ops[i]->oid) == 0) {
 259                         continue;
 260                 }
 261
 262                 nt_status = gensec_subcontext_start(spnego_state,
 263                                                     gensec_security,
 264                                                     &spnego_state->sub_sec_security);
 265                 if (!NT_STATUS_IS_OK(nt_status)) {
 266                         return nt_status;
 267                 }
 268                 /* select the sub context */
 269                 nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
 270                                                      all_ops[i]->oid);
 271                 if (!NT_STATUS_IS_OK(nt_status)) {
 272                         talloc_free(spnego_state->sub_sec_security);
 273                         spnego_state->sub_sec_security = NULL;
 274                         continue;
 275                 }
 276                 nt_status = gensec_update(spnego_state->sub_sec_security,
 277                                                           out_mem_ctx, in, out);
 278                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 279                         spnego_state->state_position = SPNEGO_FALLBACK;
 280                         return nt_status;
 281                 }
 282                 talloc_free(spnego_state->sub_sec_security);
 283                 spnego_state->sub_sec_security = NULL;
 284         }
 285         DEBUG(1, ("Failed to parse SPNEGO request\n"));
 286         return NT_STATUS_INVALID_PARAMETER;
 287
 288 }
 289
 290 /*
 291    Parse the netTokenInit from the client, to the server.
 292
 293
 294 */
 295
 296 static NTSTATUS gensec_spnego_server_parse_negTokenInit(struct gensec_security *gensec_security,
 297                                                         struct spnego_state *spnego_state,
 298                                                         TALLOC_CTX *out_mem_ctx,
 299                                                         const char **mechType,
 300                                                         const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out)
 301 {
 302         NTSTATUS nt_status;
 303
 304         if (!mechType || !mechType[0]) {
 305                 DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
 306                 return NT_STATUS_INVALID_PARAMETER;
 307         }
 308
 309         nt_status = gensec_subcontext_start(spnego_state,
 310                                             gensec_security,
 311                                             &spnego_state->sub_sec_security);
 312         if (!NT_STATUS_IS_OK(nt_status)) {
 313                 return nt_status;
 314         }
 315         /* select the sub context */
 316         nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
 317                                              mechType[0]);
 318         if (!NT_STATUS_IS_OK(nt_status)) {
 319                 talloc_free(spnego_state->sub_sec_security);
 320                 spnego_state->sub_sec_security = NULL;
 321                 return nt_status;
 322         }
 323
 324         if (!unwrapped_in.length) {
 325                 return NT_STATUS_INVALID_PARAMETER;
 326         }
 327
 328         nt_status = gensec_update(spnego_state->sub_sec_security,
 329                                   out_mem_ctx,
 330                                   unwrapped_in,
 331                                   unwrapped_out);
 332
 333         if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
 334                 DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
 335                           spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
 336                 talloc_free(spnego_state->sub_sec_security);
 337                 spnego_state->sub_sec_security = NULL;
 338         }
 339         return nt_status;
 340 }
 341
 342 static NTSTATUS gensec_spnego_client_parse_negTokenInit(struct gensec_security *gensec_security,
 343                                                         struct spnego_state *spnego_state,
 344                                                         TALLOC_CTX *out_mem_ctx,
 345                                                         const char **mechType,
 346                                                         const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out)
 347 {
 348         int i;
 349         NTSTATUS nt_status;
 350         DATA_BLOB null_data_blob = data_blob(NULL,0);
 351
 352         for (i=0; mechType && mechType[i]; i++) {
 353                 nt_status = gensec_subcontext_start(spnego_state,
 354                                                     gensec_security,
 355                                                     &spnego_state->sub_sec_security);
 356                 if (!NT_STATUS_IS_OK(nt_status)) {
 357                         break;
 358                 }
 359                 /* select the sub context */
 360                 nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
 361                                                      mechType[i]);
 362                 if (!NT_STATUS_IS_OK(nt_status)) {
 363                         talloc_free(spnego_state->sub_sec_security);
 364                         spnego_state->sub_sec_security = NULL;
 365                         continue;
 366                 }
 367
 368                 if (i == 0) {
 369                         nt_status = gensec_update(spnego_state->sub_sec_security,
 370                                                   out_mem_ctx,
 371                                                   unwrapped_in,
 372                                                   unwrapped_out);
 373                 } else {
 374                         /* only get the helping start blob for the first OID */
 375                         nt_status = gensec_update(spnego_state->sub_sec_security,
 376                                                   out_mem_ctx,
 377                                                   null_data_blob,
 378                                                   unwrapped_out);
 379                 }
 380                 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
 381                         DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
 382                                   spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
 383                         talloc_free(spnego_state->sub_sec_security);
 384                         spnego_state->sub_sec_security = NULL;
 385                 }
 386                 return nt_status;
 387         }
 388         if (!mechType || !mechType[i]) {
 389                 DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
 390         }
 391         return NT_STATUS_INVALID_PARAMETER;
 392 }
 393
 394 /** create a client negTokenInit
 395  *
 396  * This is the case, where the client is the first one who sends data
 397 */
 398
 399 static NTSTATUS gensec_spnego_client_negTokenInit(struct gensec_security *gensec_security,
 400                                                   struct spnego_state *spnego_state,
 401                                                   TALLOC_CTX *out_mem_ctx,
 402                                                   const DATA_BLOB in, DATA_BLOB *out)
 403 {
 404         DATA_BLOB null_data_blob = data_blob(NULL,0);
 405         NTSTATUS nt_status;
 406         const char **mechTypes = NULL;
 407         DATA_BLOB unwrapped_out = data_blob(NULL,0);
 408
 409         mechTypes = gensec_security_oids(out_mem_ctx, GENSEC_OID_SPNEGO);
 410
 411         if (!mechTypes) {
 412                 DEBUG(1, ("no GENSEC OID backends available\n"));
 413                 return NT_STATUS_INVALID_PARAMETER;
 414         }
 415
 416         nt_status = gensec_subcontext_start(spnego_state,
 417                                             gensec_security,
 418                                             &spnego_state->sub_sec_security);
 419         if (!NT_STATUS_IS_OK(nt_status)) {
 420                 return nt_status;
 421         }
 422         /* select our preferred mech */
 423         nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
 424                                              mechTypes[0]);
 425         if (!NT_STATUS_IS_OK(nt_status)) {
 426                 talloc_free(spnego_state->sub_sec_security);
 427                 spnego_state->sub_sec_security = NULL;
 428                 return nt_status;
 429         }
 430         nt_status = gensec_update(spnego_state->sub_sec_security,
 431                                   out_mem_ctx, in, &unwrapped_out);
 432         if (NT_STATUS_IS_OK(nt_status) || NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 433                 struct spnego_data spnego_out;
 434                 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
 435                 spnego_out.negTokenInit.mechTypes = mechTypes;
 436                 spnego_out.negTokenInit.reqFlags = 0;
 437                 spnego_out.negTokenInit.mechListMIC = null_data_blob;
 438                 spnego_out.negTokenInit.mechToken = unwrapped_out;
 439
 440                 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 441                         DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
 442                                 return NT_STATUS_INVALID_PARAMETER;
 443                 }
 444
 445                 /* set next state */
 446                 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 447                 spnego_state->state_position = SPNEGO_CLIENT_TARG;
 448
 449                 if (NT_STATUS_IS_OK(nt_status)) {
 450                         spnego_state->no_response_expected = True;
 451                 }
 452
 453                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 454         }
 455         talloc_free(spnego_state->sub_sec_security);
 456         spnego_state->sub_sec_security = NULL;
 457
 458         DEBUG(1, ("Failed to setup SPNEGO negTokenInit request: %s\n", nt_errstr(nt_status)));
 459         return NT_STATUS_INVALID_PARAMETER;
 460 }
 461
 462
 463 /** create a client negTokenTarg
 464  *
 465  * This is the case, where the client is the first one who sends data
 466 */
 467
 468 static NTSTATUS gensec_spnego_server_negTokenTarg(struct gensec_security *gensec_security,
 469                                                   struct spnego_state *spnego_state,
 470                                                   TALLOC_CTX *out_mem_ctx,
 471                                                   NTSTATUS nt_status,
 472                                                   const DATA_BLOB unwrapped_out, DATA_BLOB *out)
 473 {
 474         struct spnego_data spnego_out;
 475         DATA_BLOB null_data_blob = data_blob(NULL, 0);
 476
 477         /* compose reply */
 478         spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
 479         spnego_out.negTokenTarg.responseToken = unwrapped_out;
 480         spnego_out.negTokenTarg.mechListMIC = null_data_blob;
 481         spnego_out.negTokenTarg.supportedMech = NULL;
 482
 483         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 484                 spnego_out.negTokenTarg.supportedMech
 485                         = spnego_state->sub_sec_security->ops->oid;
 486                 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
 487                 spnego_state->state_position = SPNEGO_SERVER_TARG;
 488         } else if (NT_STATUS_IS_OK(nt_status)) {
 489                 if (unwrapped_out.data) {
 490                         spnego_out.negTokenTarg.supportedMech
 491                                 = spnego_state->sub_sec_security->ops->oid;
 492                 }
 493                 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
 494                 spnego_state->state_position = SPNEGO_DONE;
 495         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)) {
 496                 if (spnego_state->sub_sec_security) {
 497                         /* we have a mech, but we just didn't get the input parameter */
 498                         spnego_out.negTokenTarg.supportedMech
 499                                 = spnego_state->sub_sec_security->ops->oid;
 500                 } else {
 501                         const char **mechTypes = gensec_security_oids(out_mem_ctx, GENSEC_OID_SPNEGO);
 502                         if (!mechTypes) {
 503                                 DEBUG(1, ("no GENSEC OID backends available\n"));
 504                                 return NT_STATUS_INVALID_PARAMETER;
 505                         }
 506
 507                         nt_status = gensec_subcontext_start(spnego_state,
 508                                                             gensec_security,
 509                                                             &spnego_state->sub_sec_security);
 510                         if (!NT_STATUS_IS_OK(nt_status)) {
 511                                 return nt_status;
 512                         }
 513                         /* select our preferred mech */
 514                         nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
 515                                                              mechTypes[0]);
 516                         if (!NT_STATUS_IS_OK(nt_status)) {
 517                                 talloc_free(spnego_state->sub_sec_security);
 518                                 spnego_state->sub_sec_security = NULL;
 519                                 return nt_status;
 520                         }
 521
 522                         /* we should be sending the whole list here */
 523                         spnego_out.negTokenTarg.supportedMech = mechTypes[0];
 524                 }
 525
 526                 spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
 527                 spnego_state->state_position = SPNEGO_SERVER_TARG;
 528                 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 529         } else {
 530                 spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
 531                 DEBUG(2, ("SPNEGO login failed: %s\n", nt_errstr(nt_status)));
 532                 spnego_state->state_position = SPNEGO_DONE;
 533         }
 534
 535         if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 536                 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
 537                 return NT_STATUS_INVALID_PARAMETER;
 538         }
 539
 540         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 541
 542         return nt_status;
 543 }
 544
 545
 546 static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
 547                                      const DATA_BLOB in, DATA_BLOB *out)
 548 {
 549         struct spnego_state *spnego_state = gensec_security->private_data;
 550         DATA_BLOB null_data_blob = data_blob(NULL, 0);
 551         DATA_BLOB unwrapped_out = data_blob(NULL, 0);
 552         struct spnego_data spnego_out;
 553         struct spnego_data spnego;
 554
 555         ssize_t len;
 556
 557         *out = data_blob(NULL, 0);
 558
 559         if (!out_mem_ctx) {
 560                 out_mem_ctx = spnego_state;
 561         }
 562
 563         /* and switch into the state machine */
 564
 565         switch (spnego_state->state_position) {
 566         case SPNEGO_FALLBACK:
 567                 return gensec_update(spnego_state->sub_sec_security,
 568                                      out_mem_ctx, in, out);
 569         case SPNEGO_SERVER_START:
 570         {
 571                 if (in.length) {
 572                         NTSTATUS nt_status;
 573
 574                         len = spnego_read_data(in, &spnego);
 575                         if (len == -1) {
 576                                 return gensec_spnego_server_try_fallback(gensec_security, spnego_state, out_mem_ctx, in, out);
 577                         }
 578                         /* client sent NegTargetInit, we send NegTokenTarg */
 579
 580                         /* OK, so it's real SPNEGO, check the packet's the one we expect */
 581                         if (spnego.type != spnego_state->expected_packet) {
 582                                 DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 583                                           spnego_state->expected_packet));
 584                                 dump_data(1, in.data, in.length);
 585                                 spnego_free_data(&spnego);
 586                                 return NT_STATUS_INVALID_PARAMETER;
 587                         }
 588
 589                         nt_status = gensec_spnego_server_parse_negTokenInit(gensec_security,
 590                                                                      spnego_state,
 591                                                                      out_mem_ctx,
 592                                                                      spnego.negTokenInit.mechTypes,
 593                                                                      spnego.negTokenInit.mechToken,
 594                                                                      &unwrapped_out);
 595
 596                         nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
 597                                                                       spnego_state,
 598                                                                       out_mem_ctx,
 599                                                                       nt_status,
 600                                                                       unwrapped_out,
 601                                                                       out);
 602
 603                         spnego_free_data(&spnego);
 604
 605                         return nt_status;
 606                 } else {
 607                         const char **mechlist = gensec_security_oids(out_mem_ctx, GENSEC_OID_SPNEGO);
 608
 609                         spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
 610                         spnego_out.negTokenInit.mechTypes = mechlist;
 611                         spnego_out.negTokenInit.reqFlags = 0;
 612                         spnego_out.negTokenInit.mechListMIC
 613                                 = data_blob_string_const(talloc_asprintf(out_mem_ctx, "%s$@%s", lp_netbios_name(), lp_realm()));
 614                         spnego_out.negTokenInit.mechToken = unwrapped_out;
 615
 616                         if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 617                                 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
 618                                 return NT_STATUS_INVALID_PARAMETER;
 619                         }
 620
 621                         /* set next state */
 622                         spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 623                         spnego_state->state_position = SPNEGO_SERVER_TARG;
 624
 625                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 626                 }
 627         }
 628
 629         case SPNEGO_CLIENT_START:
 630         {
 631                 /* The server offers a list of mechanisms */
 632
 633                 const char *my_mechs[] = {NULL, NULL};
 634                 NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
 635
 636                 if (!in.length) {
 637                         /* client to produce negTokenInit */
 638                         return gensec_spnego_client_negTokenInit(gensec_security, spnego_state,
 639                                                                  out_mem_ctx, in, out);
 640                 }
 641
 642                 len = spnego_read_data(in, &spnego);
 643
 644                 if (len == -1) {
 645                         DEBUG(1, ("Invalid SPNEGO request:\n"));
 646                         dump_data(1, in.data, in.length);
 647                         return NT_STATUS_INVALID_PARAMETER;
 648                 }
 649
 650                 /* OK, so it's real SPNEGO, check the packet's the one we expect */
 651                 if (spnego.type != spnego_state->expected_packet) {
 652                         DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 653                                   spnego_state->expected_packet));
 654                         dump_data(1, in.data, in.length);
 655                         spnego_free_data(&spnego);
 656                         return NT_STATUS_INVALID_PARAMETER;
 657                 }
 658
 659                 if (spnego.negTokenInit.targetPrincipal) {
 660                         DEBUG(5, ("Server claims it's principal name is %s (ignored)\n", spnego.negTokenInit.targetPrincipal));
 661                 }
 662
 663                 nt_status = gensec_spnego_client_parse_negTokenInit(gensec_security,
 664                                                              spnego_state,
 665                                                              out_mem_ctx,
 666                                                              spnego.negTokenInit.mechTypes,
 667                                                              spnego.negTokenInit.mechToken,
 668                                                              &unwrapped_out);
 669
 670                 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
 671                         spnego_free_data(&spnego);
 672                         return nt_status;
 673                 }
 674
 675                 /* compose reply */
 676                 my_mechs[0] = spnego_state->sub_sec_security->ops->oid;
 677
 678                 spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
 679                 spnego_out.negTokenInit.mechTypes = my_mechs;
 680                 spnego_out.negTokenInit.reqFlags = 0;
 681                 spnego_out.negTokenInit.mechListMIC = null_data_blob;
 682                 spnego_out.negTokenInit.mechToken = unwrapped_out;
 683
 684                 if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 685                         DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
 686                                 return NT_STATUS_INVALID_PARAMETER;
 687                 }
 688
 689                 /* set next state */
 690                 spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
 691                 spnego_state->state_position = SPNEGO_CLIENT_TARG;
 692
 693                 if (NT_STATUS_IS_OK(nt_status)) {
 694                         spnego_state->no_response_expected = True;
 695                 }
 696
 697                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 698         }
 699         case SPNEGO_SERVER_TARG:
 700         {
 701                 NTSTATUS nt_status;
 702                 if (!in.length) {
 703                         return NT_STATUS_INVALID_PARAMETER;
 704                 }
 705
 706                 len = spnego_read_data(in, &spnego);
 707
 708                 if (len == -1) {
 709                         DEBUG(1, ("Invalid SPNEGO request:\n"));
 710                         dump_data(1, in.data, in.length);
 711                         return NT_STATUS_INVALID_PARAMETER;
 712                 }
 713
 714                 /* OK, so it's real SPNEGO, check the packet's the one we expect */
 715                 if (spnego.type != spnego_state->expected_packet) {
 716                         DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 717                                   spnego_state->expected_packet));
 718                         dump_data(1, in.data, in.length);
 719                         spnego_free_data(&spnego);
 720                         return NT_STATUS_INVALID_PARAMETER;
 721                 }
 722
 723                 if (!spnego_state->sub_sec_security) {
 724                         DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
 725                         return NT_STATUS_INVALID_PARAMETER;
 726                 }
 727
 728                 nt_status = gensec_update(spnego_state->sub_sec_security,
 729                                           out_mem_ctx,
 730                                           spnego.negTokenTarg.responseToken,
 731                                           &unwrapped_out);
 732
 733                 nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
 734                                                               spnego_state,
 735                                                               out_mem_ctx,
 736                                                               nt_status,
 737                                                               unwrapped_out,
 738                                                               out);
 739
 740                 spnego_free_data(&spnego);
 741
 742                 return nt_status;
 743         }
 744         case SPNEGO_CLIENT_TARG:
 745         {
 746                 NTSTATUS nt_status;
 747                 if (!in.length) {
 748                         return NT_STATUS_INVALID_PARAMETER;
 749                 }
 750
 751                 len = spnego_read_data(in, &spnego);
 752
 753                 if (len == -1) {
 754                         DEBUG(1, ("Invalid SPNEGO request:\n"));
 755                         dump_data(1, in.data, in.length);
 756                         return NT_STATUS_INVALID_PARAMETER;
 757                 }
 758
 759                 /* OK, so it's real SPNEGO, check the packet's the one we expect */
 760                 if (spnego.type != spnego_state->expected_packet) {
 761                         DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
 762                                   spnego_state->expected_packet));
 763                         dump_data(1, in.data, in.length);
 764                         spnego_free_data(&spnego);
 765                         return NT_STATUS_INVALID_PARAMETER;
 766                 }
 767
 768                 if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
 769                         return NT_STATUS_ACCESS_DENIED;
 770                 }
 771
 772                 if (spnego_state->no_response_expected) {
 773                         if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
 774                                 DEBUG(3,("GENSEC SPNEGO: client GENSEC accepted, but server rejected (bad password?)\n"));
 775                                 nt_status = NT_STATUS_INVALID_PARAMETER;
 776                         } else if (spnego.negTokenTarg.responseToken.length) {
 777                                 DEBUG(2,("GENSEC SPNEGO: client GENSEC accepted, but server continued negotiation!\n"));
 778                                 nt_status = NT_STATUS_INVALID_PARAMETER;
 779                         } else {
 780                                 nt_status = NT_STATUS_OK;
 781                         }
 782                 } else {
 783                         nt_status = gensec_update(spnego_state->sub_sec_security,
 784                                                   out_mem_ctx,
 785                                                   spnego.negTokenTarg.responseToken,
 786                                                   &unwrapped_out);
 787
 788                         if (NT_STATUS_IS_OK(nt_status)) {
 789                                 spnego_state->no_response_expected = True;
 790                         }
 791                 }
 792
 793                 spnego_free_data(&spnego);
 794
 795                 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
 796                         && !NT_STATUS_IS_OK(nt_status)) {
 797                         DEBUG(1, ("SPNEGO(%s) login failed: %s\n",
 798                                   spnego_state->sub_sec_security->ops->name,
 799                                   nt_errstr(nt_status)));
 800                         return nt_status;
 801                 }
 802
 803                 if (unwrapped_out.length) {
 804                         /* compose reply */
 805                         spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
 806                         spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
 807                         spnego_out.negTokenTarg.supportedMech = NULL;
 808                         spnego_out.negTokenTarg.responseToken = unwrapped_out;
 809                         spnego_out.negTokenTarg.mechListMIC = null_data_blob;
 810
 811                         if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
 812                                 DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
 813                                 return NT_STATUS_INVALID_PARAMETER;
 814                         }
 815
 816                         spnego_state->state_position = SPNEGO_CLIENT_TARG;
 817                         nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 818                 } else {
 819
 820                         /* all done - server has accepted, and we agree */
 821                         *out = null_data_blob;
 822
 823                         if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
 824                                 /* unless of course it did not accept */
 825                                 DEBUG(1,("gensec_update ok but not accepted\n"));
 826                                 nt_status = NT_STATUS_INVALID_PARAMETER;
 827                         }
 828                 }
 829
 830                 spnego_state->state_position = SPNEGO_DONE;
 831
 832                 return nt_status;
 833         }
 834         case SPNEGO_DONE:
 835                 return NT_STATUS_OK;
 836         }
 837         return NT_STATUS_INVALID_PARAMETER;
 838 }
 839
 840 static BOOL gensec_spnego_have_feature(struct gensec_security *gensec_security,
 841                                        uint32_t feature)
 842 {
 843         struct spnego_state *spnego_state = gensec_security->private_data;
 844         if (!spnego_state->sub_sec_security) {
 845                 return False;
 846         }
 847
 848         return gensec_have_feature(spnego_state->sub_sec_security,
 849                                    feature);
 850 }
 851
 852 static const struct gensec_security_ops gensec_spnego_security_ops = {
 853         .name           = "spnego",
 854         .sasl_name      = "GSS-SPNEGO",
 855         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
 856         .oid            = GENSEC_OID_SPNEGO,
 857         .client_start   = gensec_spnego_client_start,
 858         .server_start   = gensec_spnego_server_start,
 859         .update         = gensec_spnego_update,
 860         .seal_packet    = gensec_spnego_seal_packet,
 861         .sign_packet    = gensec_spnego_sign_packet,
 862         .sig_size       = gensec_spnego_sig_size,
 863         .check_packet   = gensec_spnego_check_packet,
 864         .unseal_packet  = gensec_spnego_unseal_packet,
 865         .wrap           = gensec_spnego_wrap,
 866         .unwrap         = gensec_spnego_unwrap,
 867         .session_key    = gensec_spnego_session_key,
 868         .session_info   = gensec_spnego_session_info,
 869         .have_feature   = gensec_spnego_have_feature,
 870         .enabled        = True
 871 };
 872
 873 NTSTATUS gensec_spnego_init(void)
 874 {
 875         NTSTATUS ret;
 876         ret = gensec_register(&gensec_spnego_security_ops);
 877         if (!NT_STATUS_IS_OK(ret)) {
 878                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 879                         gensec_spnego_security_ops.name));
 880                 return ret;
 881         }
 882
 883         return ret;
 884 }