crypto/heimdal/lib/gssapi/krb5/accept_sec_context.c

   1 /*
   2  * Copyright (c) 1997 - 2006 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "krb5/gsskrb5_locl.h"
  35
  36 RCSID("$Id: accept_sec_context.c 20199 2007-02-07 22:36:39Z lha $");
  37
  38 HEIMDAL_MUTEX gssapi_keytab_mutex = HEIMDAL_MUTEX_INITIALIZER;
  39 krb5_keytab _gsskrb5_keytab;
  40
  41 OM_uint32
  42 _gsskrb5_register_acceptor_identity (const char *identity)
  43 {
  44     krb5_context context;
  45     krb5_error_code ret;
  46
  47     ret = _gsskrb5_init(&context);
  48     if(ret)
  49         return GSS_S_FAILURE;
  50
  51     HEIMDAL_MUTEX_lock(&gssapi_keytab_mutex);
  52
  53     if(_gsskrb5_keytab != NULL) {
  54         krb5_kt_close(context, _gsskrb5_keytab);
  55         _gsskrb5_keytab = NULL;
  56     }
  57     if (identity == NULL) {
  58         ret = krb5_kt_default(context, &_gsskrb5_keytab);
  59     } else {
  60         char *p;
  61
  62         asprintf(&p, "FILE:%s", identity);
  63         if(p == NULL) {
  64             HEIMDAL_MUTEX_unlock(&gssapi_keytab_mutex);
  65             return GSS_S_FAILURE;
  66         }
  67         ret = krb5_kt_resolve(context, p, &_gsskrb5_keytab);
  68         free(p);
  69     }
  70     HEIMDAL_MUTEX_unlock(&gssapi_keytab_mutex);
  71     if(ret)
  72         return GSS_S_FAILURE;
  73     return GSS_S_COMPLETE;
  74 }
  75
  76 void
  77 _gsskrb5i_is_cfx(gsskrb5_ctx ctx, int *is_cfx)
  78 {
  79     krb5_keyblock *key;
  80     int acceptor = (ctx->more_flags & LOCAL) == 0;
  81
  82     *is_cfx = 0;
  83
  84     if (acceptor) {
  85         if (ctx->auth_context->local_subkey)
  86             key = ctx->auth_context->local_subkey;
  87         else
  88             key = ctx->auth_context->remote_subkey;
  89     } else {
  90         if (ctx->auth_context->remote_subkey)
  91             key = ctx->auth_context->remote_subkey;
  92         else
  93             key = ctx->auth_context->local_subkey;
  94     }
  95     if (key == NULL)
  96         key = ctx->auth_context->keyblock;
  97
  98     if (key == NULL)
  99         return;
 100
 101     switch (key->keytype) {
 102     case ETYPE_DES_CBC_CRC:
 103     case ETYPE_DES_CBC_MD4:
 104     case ETYPE_DES_CBC_MD5:
 105     case ETYPE_DES3_CBC_MD5:
 106     case ETYPE_DES3_CBC_SHA1:
 107     case ETYPE_ARCFOUR_HMAC_MD5:
 108     case ETYPE_ARCFOUR_HMAC_MD5_56:
 109         break;
 110     default :
 111         *is_cfx = 1;
 112         if ((acceptor && ctx->auth_context->local_subkey) ||
 113             (!acceptor && ctx->auth_context->remote_subkey))
 114             ctx->more_flags |= ACCEPTOR_SUBKEY;
 115         break;
 116     }
 117 }
 118
 119
 120 static OM_uint32
 121 gsskrb5_accept_delegated_token
 122 (OM_uint32 * minor_status,
 123  gsskrb5_ctx ctx,
 124  krb5_context context,
 125  gss_cred_id_t * delegated_cred_handle
 126     )
 127 {
 128     krb5_ccache ccache = NULL;
 129     krb5_error_code kret;
 130     int32_t ac_flags, ret = GSS_S_COMPLETE;
 131
 132     *minor_status = 0;
 133
 134     /* XXX Create a new delegated_cred_handle? */
 135     if (delegated_cred_handle == NULL) {
 136         kret = krb5_cc_default (context, &ccache);
 137     } else {
 138         *delegated_cred_handle = NULL;
 139         kret = krb5_cc_gen_new (context, &krb5_mcc_ops, &ccache);
 140     }
 141     if (kret) {
 142         ctx->flags &= ~GSS_C_DELEG_FLAG;
 143         goto out;
 144     }
 145
 146     kret = krb5_cc_initialize(context, ccache, ctx->source);
 147     if (kret) {
 148         ctx->flags &= ~GSS_C_DELEG_FLAG;
 149         goto out;
 150     }
 151
 152     krb5_auth_con_removeflags(context,
 153                               ctx->auth_context,
 154                               KRB5_AUTH_CONTEXT_DO_TIME,
 155                               &ac_flags);
 156     kret = krb5_rd_cred2(context,
 157                          ctx->auth_context,
 158                          ccache,
 159                          &ctx->fwd_data);
 160     krb5_auth_con_setflags(context,
 161                            ctx->auth_context,
 162                            ac_flags);
 163     if (kret) {
 164         ctx->flags &= ~GSS_C_DELEG_FLAG;
 165         ret = GSS_S_FAILURE;
 166         *minor_status = kret;
 167         goto out;
 168     }
 169
 170     if (delegated_cred_handle) {
 171         gsskrb5_cred handle;
 172
 173         ret = _gsskrb5_import_cred(minor_status,
 174                                    ccache,
 175                                    NULL,
 176                                    NULL,
 177                                    delegated_cred_handle);
 178         if (ret != GSS_S_COMPLETE)
 179             goto out;
 180
 181         handle = (gsskrb5_cred) *delegated_cred_handle;
 182
 183         handle->cred_flags |= GSS_CF_DESTROY_CRED_ON_RELEASE;
 184         krb5_cc_close(context, ccache);
 185         ccache = NULL;
 186     }
 187
 188 out:
 189     if (ccache) {
 190         /* Don't destroy the default cred cache */
 191         if (delegated_cred_handle == NULL)
 192             krb5_cc_close(context, ccache);
 193         else
 194             krb5_cc_destroy(context, ccache);
 195     }
 196     return ret;
 197 }
 198
 199 static OM_uint32
 200 gsskrb5_acceptor_ready(OM_uint32 * minor_status,
 201                        gsskrb5_ctx ctx,
 202                        krb5_context context,
 203                        gss_cred_id_t *delegated_cred_handle)
 204 {
 205     OM_uint32 ret;
 206     int32_t seq_number;
 207     int is_cfx = 0;
 208
 209     krb5_auth_getremoteseqnumber (context,
 210                                   ctx->auth_context,
 211                                   &seq_number);
 212
 213     _gsskrb5i_is_cfx(ctx, &is_cfx);
 214
 215     ret = _gssapi_msg_order_create(minor_status,
 216                                    &ctx->order,
 217                                    _gssapi_msg_order_f(ctx->flags),
 218                                    seq_number, 0, is_cfx);
 219     if (ret)
 220         return ret;
 221
 222     /*
 223      * If requested, set local sequence num to remote sequence if this
 224      * isn't a mutual authentication context
 225      */
 226     if (!(ctx->flags & GSS_C_MUTUAL_FLAG) && _gssapi_msg_order_f(ctx->flags)) {
 227         krb5_auth_con_setlocalseqnumber(context,
 228                                         ctx->auth_context,
 229                                         seq_number);
 230     }
 231
 232     /*
 233      * We should handle the delegation ticket, in case it's there
 234      */
 235     if (ctx->fwd_data.length > 0 && (ctx->flags & GSS_C_DELEG_FLAG)) {
 236         ret = gsskrb5_accept_delegated_token(minor_status,
 237                                              ctx,
 238                                              context,
 239                                              delegated_cred_handle);
 240         if (ret)
 241             return ret;
 242     } else {
 243         /* Well, looks like it wasn't there after all */
 244         ctx->flags &= ~GSS_C_DELEG_FLAG;
 245     }
 246
 247     ctx->state = ACCEPTOR_READY;
 248     ctx->more_flags |= OPEN;
 249
 250     return GSS_S_COMPLETE;
 251 }
 252
 253 static OM_uint32
 254 gsskrb5_acceptor_start(OM_uint32 * minor_status,
 255                        gsskrb5_ctx ctx,
 256                        krb5_context context,
 257                        const gss_cred_id_t acceptor_cred_handle,
 258                        const gss_buffer_t input_token_buffer,
 259                        const gss_channel_bindings_t input_chan_bindings,
 260                        gss_name_t * src_name,
 261                        gss_OID * mech_type,
 262                        gss_buffer_t output_token,
 263                        OM_uint32 * ret_flags,
 264                        OM_uint32 * time_rec,
 265                        gss_cred_id_t * delegated_cred_handle)
 266 {
 267     krb5_error_code kret;
 268     OM_uint32 ret = GSS_S_COMPLETE;
 269     krb5_data indata;
 270     krb5_flags ap_options;
 271     krb5_keytab keytab = NULL;
 272     int is_cfx = 0;
 273     const gsskrb5_cred acceptor_cred = (gsskrb5_cred)acceptor_cred_handle;
 274
 275     /*
 276      * We may, or may not, have an escapsulation.
 277      */
 278     ret = _gsskrb5_decapsulate (minor_status,
 279                                 input_token_buffer,
 280                                 &indata,
 281                                 "\x01\x00",
 282                                 GSS_KRB5_MECHANISM);
 283
 284     if (ret) {
 285         /* Assume that there is no OID wrapping. */
 286         indata.length   = input_token_buffer->length;
 287         indata.data     = input_token_buffer->value;
 288     }
 289
 290     /*
 291      * We need to get our keytab
 292      */
 293     if (acceptor_cred == NULL) {
 294         if (_gsskrb5_keytab != NULL)
 295             keytab = _gsskrb5_keytab;
 296     } else if (acceptor_cred->keytab != NULL) {
 297         keytab = acceptor_cred->keytab;
 298     }
 299
 300     /*
 301      * We need to check the ticket and create the AP-REP packet
 302      */
 303
 304     {
 305         krb5_rd_req_in_ctx in = NULL;
 306         krb5_rd_req_out_ctx out = NULL;
 307
 308         kret = krb5_rd_req_in_ctx_alloc(context, &in);
 309         if (kret == 0)
 310             kret = krb5_rd_req_in_set_keytab(context, in, keytab);
 311         if (kret) {
 312             if (in)
 313                 krb5_rd_req_in_ctx_free(context, in);
 314             ret = GSS_S_FAILURE;
 315             *minor_status = kret;
 316             return ret;
 317         }
 318
 319         kret = krb5_rd_req_ctx(context,
 320                                &ctx->auth_context,
 321                                &indata,
 322                                (acceptor_cred_handle == GSS_C_NO_CREDENTIAL) ? NULL : acceptor_cred->principal,
 323                                in, &out);
 324         krb5_rd_req_in_ctx_free(context, in);
 325         if (kret) {
 326             ret = GSS_S_FAILURE;
 327             *minor_status = kret;
 328             return ret;
 329         }
 330
 331         /*
 332          * We need to remember some data on the context_handle.
 333          */
 334         kret = krb5_rd_req_out_get_ap_req_options(context, out,
 335                                                   &ap_options);
 336         if (kret == 0)
 337             kret = krb5_rd_req_out_get_ticket(context, out,
 338                                               &ctx->ticket);
 339         if (kret == 0)
 340             kret = krb5_rd_req_out_get_keyblock(context, out,
 341                                                 &ctx->service_keyblock);
 342         ctx->lifetime = ctx->ticket->ticket.endtime;
 343
 344         krb5_rd_req_out_ctx_free(context, out);
 345         if (kret) {
 346             ret = GSS_S_FAILURE;
 347             *minor_status = kret;
 348             return ret;
 349         }
 350     }
 351
 352
 353     /*
 354      * We need to copy the principal names to the context and the
 355      * calling layer.
 356      */
 357     kret = krb5_copy_principal(context,
 358                                ctx->ticket->client,
 359                                &ctx->source);
 360     if (kret) {
 361         ret = GSS_S_FAILURE;
 362         *minor_status = kret;
 363     }
 364
 365     kret = krb5_copy_principal(context,
 366                                ctx->ticket->server,
 367                                &ctx->target);
 368     if (kret) {
 369         ret = GSS_S_FAILURE;
 370         *minor_status = kret;
 371         return ret;
 372     }
 373
 374     /*
 375      * We need to setup some compat stuff, this assumes that
 376      * context_handle->target is already set.
 377      */
 378     ret = _gss_DES3_get_mic_compat(minor_status, ctx, context);
 379     if (ret)
 380         return ret;
 381
 382     if (src_name != NULL) {
 383         kret = krb5_copy_principal (context,
 384                                     ctx->ticket->client,
 385                                     (gsskrb5_name*)src_name);
 386         if (kret) {
 387             ret = GSS_S_FAILURE;
 388             *minor_status = kret;
 389             return ret;
 390         }
 391     }
 392
 393     /*
 394      * We need to get the flags out of the 8003 checksum.
 395      */
 396     {
 397         krb5_authenticator authenticator;
 398
 399         kret = krb5_auth_con_getauthenticator(context,
 400                                               ctx->auth_context,
 401                                               &authenticator);
 402         if(kret) {
 403             ret = GSS_S_FAILURE;
 404             *minor_status = kret;
 405             return ret;
 406         }
 407
 408         if (authenticator->cksum->cksumtype == CKSUMTYPE_GSSAPI) {
 409             ret = _gsskrb5_verify_8003_checksum(minor_status,
 410                                                 input_chan_bindings,
 411                                                 authenticator->cksum,
 412                                                 &ctx->flags,
 413                                                 &ctx->fwd_data);
 414
 415             krb5_free_authenticator(context, &authenticator);
 416             if (ret) {
 417                 return ret;
 418             }
 419         } else {
 420             krb5_crypto crypto;
 421
 422             kret = krb5_crypto_init(context,
 423                                     ctx->auth_context->keyblock,
 424                                     0, &crypto);
 425             if(kret) {
 426                 krb5_free_authenticator(context, &authenticator);
 427
 428                 ret = GSS_S_FAILURE;
 429                 *minor_status = kret;
 430                 return ret;
 431             }
 432
 433             /*
 434              * Windows accepts Samba3's use of a kerberos, rather than
 435              * GSSAPI checksum here
 436              */
 437
 438             kret = krb5_verify_checksum(context,
 439                                         crypto, KRB5_KU_AP_REQ_AUTH_CKSUM, NULL, 0,
 440                                         authenticator->cksum);
 441             krb5_free_authenticator(context, &authenticator);
 442             krb5_crypto_destroy(context, crypto);
 443
 444             if(kret) {
 445                 ret = GSS_S_BAD_SIG;
 446                 *minor_status = kret;
 447                 return ret;
 448             }
 449
 450             /*
 451              * Samba style get some flags (but not DCE-STYLE)
 452              */
 453             ctx->flags =
 454                 GSS_C_MUTUAL_FLAG | GSS_C_REPLAY_FLAG | GSS_C_SEQUENCE_FLAG;
 455         }
 456     }
 457
 458     if(ctx->flags & GSS_C_MUTUAL_FLAG) {
 459         krb5_data outbuf;
 460
 461         _gsskrb5i_is_cfx(ctx, &is_cfx);
 462
 463         if (is_cfx != 0
 464             || (ap_options & AP_OPTS_USE_SUBKEY)) {
 465             kret = krb5_auth_con_addflags(context,
 466                                           ctx->auth_context,
 467                                           KRB5_AUTH_CONTEXT_USE_SUBKEY,
 468                                           NULL);
 469             ctx->more_flags |= ACCEPTOR_SUBKEY;
 470         }
 471
 472         kret = krb5_mk_rep(context,
 473                            ctx->auth_context,
 474                            &outbuf);
 475         if (kret) {
 476             *minor_status = kret;
 477             return GSS_S_FAILURE;
 478         }
 479
 480         if (IS_DCE_STYLE(ctx)) {
 481             output_token->length = outbuf.length;
 482             output_token->value = outbuf.data;
 483         } else {
 484             ret = _gsskrb5_encapsulate(minor_status,
 485                                        &outbuf,
 486                                        output_token,
 487                                        "\x02\x00",
 488                                        GSS_KRB5_MECHANISM);
 489             krb5_data_free (&outbuf);
 490             if (ret)
 491                 return ret;
 492         }
 493     }
 494
 495     ctx->flags |= GSS_C_TRANS_FLAG;
 496
 497     /* Remember the flags */
 498
 499     ctx->lifetime = ctx->ticket->ticket.endtime;
 500     ctx->more_flags |= OPEN;
 501
 502     if (mech_type)
 503         *mech_type = GSS_KRB5_MECHANISM;
 504
 505     if (time_rec) {
 506         ret = _gsskrb5_lifetime_left(minor_status,
 507                                      context,
 508                                      ctx->lifetime,
 509                                      time_rec);
 510         if (ret) {
 511             return ret;
 512         }
 513     }
 514
 515     /*
 516      * When GSS_C_DCE_STYLE is in use, we need ask for a AP-REP from
 517      * the client.
 518      */
 519     if (IS_DCE_STYLE(ctx)) {
 520         /*
 521          * Return flags to caller, but we haven't processed
 522          * delgations yet
 523          */
 524         if (ret_flags)
 525             *ret_flags = (ctx->flags & ~GSS_C_DELEG_FLAG);
 526
 527         ctx->state = ACCEPTOR_WAIT_FOR_DCESTYLE;
 528         return GSS_S_CONTINUE_NEEDED;
 529     }
 530
 531     ret = gsskrb5_acceptor_ready(minor_status, ctx, context,
 532                                  delegated_cred_handle);
 533
 534     if (ret_flags)
 535         *ret_flags = ctx->flags;
 536
 537     return ret;
 538 }
 539
 540 static OM_uint32
 541 acceptor_wait_for_dcestyle(OM_uint32 * minor_status,
 542                            gsskrb5_ctx ctx,
 543                            krb5_context context,
 544                            const gss_cred_id_t acceptor_cred_handle,
 545                            const gss_buffer_t input_token_buffer,
 546                            const gss_channel_bindings_t input_chan_bindings,
 547                            gss_name_t * src_name,
 548                            gss_OID * mech_type,
 549                            gss_buffer_t output_token,
 550                            OM_uint32 * ret_flags,
 551                            OM_uint32 * time_rec,
 552                            gss_cred_id_t * delegated_cred_handle)
 553 {
 554     OM_uint32 ret;
 555     krb5_error_code kret;
 556     krb5_data inbuf;
 557     int32_t r_seq_number, l_seq_number;
 558
 559     /*
 560      * We know it's GSS_C_DCE_STYLE so we don't need to decapsulate the AP_REP
 561      */
 562
 563     inbuf.length = input_token_buffer->length;
 564     inbuf.data = input_token_buffer->value;
 565
 566     /*
 567      * We need to remeber the old remote seq_number, then check if the
 568      * client has replied with our local seq_number, and then reset
 569      * the remote seq_number to the old value
 570      */
 571     {
 572         kret = krb5_auth_con_getlocalseqnumber(context,
 573                                                ctx->auth_context,
 574                                                &l_seq_number);
 575         if (kret) {
 576             *minor_status = kret;
 577             return GSS_S_FAILURE;
 578         }
 579
 580         kret = krb5_auth_getremoteseqnumber(context,
 581                                             ctx->auth_context,
 582                                             &r_seq_number);
 583         if (kret) {
 584             *minor_status = kret;
 585             return GSS_S_FAILURE;
 586         }
 587
 588         kret = krb5_auth_con_setremoteseqnumber(context,
 589                                                 ctx->auth_context,
 590                                                 l_seq_number);
 591         if (kret) {
 592             *minor_status = kret;
 593             return GSS_S_FAILURE;
 594         }
 595     }
 596
 597     /*
 598      * We need to verify the AP_REP, but we need to flag that this is
 599      * DCE_STYLE, so don't check the timestamps this time, but put the
 600      * flag DO_TIME back afterward.
 601     */
 602     {
 603         krb5_ap_rep_enc_part *repl;
 604         int32_t auth_flags;
 605
 606         krb5_auth_con_removeflags(context,
 607                                   ctx->auth_context,
 608                                   KRB5_AUTH_CONTEXT_DO_TIME,
 609                                   &auth_flags);
 610
 611         kret = krb5_rd_rep(context, ctx->auth_context, &inbuf, &repl);
 612         if (kret) {
 613             *minor_status = kret;
 614             return GSS_S_FAILURE;
 615         }
 616         krb5_free_ap_rep_enc_part(context, repl);
 617         krb5_auth_con_setflags(context, ctx->auth_context, auth_flags);
 618     }
 619
 620     /* We need to check the liftime */
 621     {
 622         OM_uint32 lifetime_rec;
 623
 624         ret = _gsskrb5_lifetime_left(minor_status,
 625                                      context,
 626                                      ctx->lifetime,
 627                                      &lifetime_rec);
 628         if (ret) {
 629             return ret;
 630         }
 631         if (lifetime_rec == 0) {
 632             return GSS_S_CONTEXT_EXPIRED;
 633         }
 634
 635         if (time_rec) *time_rec = lifetime_rec;
 636     }
 637
 638     /* We need to give the caller the flags which are in use */
 639     if (ret_flags) *ret_flags = ctx->flags;
 640
 641     if (src_name) {
 642         kret = krb5_copy_principal(context,
 643                                    ctx->source,
 644                                    (gsskrb5_name*)src_name);
 645         if (kret) {
 646             *minor_status = kret;
 647             return GSS_S_FAILURE;
 648         }
 649     }
 650
 651     /*
 652      * After the krb5_rd_rep() the remote and local seq_number should
 653      * be the same, because the client just replies the seq_number
 654      * from our AP-REP in its AP-REP, but then the client uses the
 655      * seq_number from its AP-REQ for GSS_wrap()
 656      */
 657     {
 658         int32_t tmp_r_seq_number, tmp_l_seq_number;
 659
 660         kret = krb5_auth_getremoteseqnumber(context,
 661                                             ctx->auth_context,
 662                                             &tmp_r_seq_number);
 663         if (kret) {
 664             *minor_status = kret;
 665             return GSS_S_FAILURE;
 666         }
 667
 668         kret = krb5_auth_con_getlocalseqnumber(context,
 669                                                ctx->auth_context,
 670                                                &tmp_l_seq_number);
 671         if (kret) {
 672
 673             *minor_status = kret;
 674             return GSS_S_FAILURE;
 675         }
 676
 677         /*
 678          * Here we check if the client has responsed with our local seq_number,
 679          */
 680         if (tmp_r_seq_number != tmp_l_seq_number) {
 681             return GSS_S_UNSEQ_TOKEN;
 682         }
 683     }
 684
 685     /*
 686      * We need to reset the remote seq_number, because the client will use,
 687      * the old one for the GSS_wrap() calls
 688      */
 689     {
 690         kret = krb5_auth_con_setremoteseqnumber(context,
 691                                                 ctx->auth_context,
 692                                                 r_seq_number);
 693         if (kret) {
 694             *minor_status = kret;
 695             return GSS_S_FAILURE;
 696         }
 697     }
 698
 699     return gsskrb5_acceptor_ready(minor_status, ctx, context,
 700                                   delegated_cred_handle);
 701 }
 702
 703
 704 OM_uint32
 705 _gsskrb5_accept_sec_context(OM_uint32 * minor_status,
 706                             gss_ctx_id_t * context_handle,
 707                             const gss_cred_id_t acceptor_cred_handle,
 708                             const gss_buffer_t input_token_buffer,
 709                             const gss_channel_bindings_t input_chan_bindings,
 710                             gss_name_t * src_name,
 711                             gss_OID * mech_type,
 712                             gss_buffer_t output_token,
 713                             OM_uint32 * ret_flags,
 714                             OM_uint32 * time_rec,
 715                             gss_cred_id_t * delegated_cred_handle)
 716 {
 717     krb5_context context;
 718     OM_uint32 ret;
 719     gsskrb5_ctx ctx;
 720
 721     GSSAPI_KRB5_INIT(&context);
 722
 723     output_token->length = 0;
 724     output_token->value = NULL;
 725
 726     if (src_name != NULL)
 727         *src_name = NULL;
 728     if (mech_type)
 729         *mech_type = GSS_KRB5_MECHANISM;
 730
 731     if (*context_handle == GSS_C_NO_CONTEXT) {
 732         ret = _gsskrb5_create_ctx(minor_status,
 733                                   context_handle,
 734                                   context,
 735                                   input_chan_bindings,
 736                                   ACCEPTOR_START);
 737         if (ret)
 738             return ret;
 739     }
 740
 741     ctx = (gsskrb5_ctx)*context_handle;
 742
 743
 744     /*
 745      * TODO: check the channel_bindings
 746      * (above just sets them to krb5 layer)
 747      */
 748
 749     HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
 750
 751     switch (ctx->state) {
 752     case ACCEPTOR_START:
 753         ret = gsskrb5_acceptor_start(minor_status,
 754                                      ctx,
 755                                      context,
 756                                      acceptor_cred_handle,
 757                                      input_token_buffer,
 758                                      input_chan_bindings,
 759                                      src_name,
 760                                      mech_type,
 761                                      output_token,
 762                                      ret_flags,
 763                                      time_rec,
 764                                      delegated_cred_handle);
 765         break;
 766     case ACCEPTOR_WAIT_FOR_DCESTYLE:
 767         ret = acceptor_wait_for_dcestyle(minor_status,
 768                                          ctx,
 769                                          context,
 770                                          acceptor_cred_handle,
 771                                          input_token_buffer,
 772                                          input_chan_bindings,
 773                                          src_name,
 774                                          mech_type,
 775                                          output_token,
 776                                          ret_flags,
 777                                          time_rec,
 778                                          delegated_cred_handle);
 779         break;
 780     case ACCEPTOR_READY:
 781         /*
 782          * If we get there, the caller have called
 783          * gss_accept_sec_context() one time too many.
 784          */
 785         ret =  GSS_S_BAD_STATUS;
 786         break;
 787     default:
 788         /* TODO: is this correct here? --metze */
 789         ret =  GSS_S_BAD_STATUS;
 790         break;
 791     }
 792
 793     HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 794
 795     if (GSS_ERROR(ret)) {
 796         OM_uint32 min2;
 797         _gsskrb5_delete_sec_context(&min2, context_handle, GSS_C_NO_BUFFER);
 798     }
 799
 800     return ret;
 801 }