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