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