source/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 23433 2008-07-26 18:44:26Z 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 send_error_token(OM_uint32 *minor_status,
 255                  krb5_context context,
 256                  krb5_error_code kret,
 257                  krb5_principal server,
 258                  krb5_data *indata,
 259                  gss_buffer_t output_token)
 260 {
 261     krb5_principal ap_req_server = NULL;
 262     krb5_error_code ret;
 263     krb5_data outbuf;
 264
 265     /* build server from request if the acceptor had not selected one */
 266     if (server == NULL) {
 267         AP_REQ ap_req;
 268
 269         ret = krb5_decode_ap_req(context, indata, &ap_req);
 270         if (ret) {
 271             *minor_status = ret;
 272             return GSS_S_FAILURE;
 273         }
 274         ret = _krb5_principalname2krb5_principal(context,
 275                                                   &ap_req_server,
 276                                                   ap_req.ticket.sname,
 277                                                   ap_req.ticket.realm);
 278         free_AP_REQ(&ap_req);
 279         if (ret) {
 280             *minor_status = ret;
 281             return GSS_S_FAILURE;
 282         }
 283         server = ap_req_server;
 284     }
 285
 286     ret = krb5_mk_error(context, kret, NULL, NULL, NULL,
 287                         server, NULL, NULL, &outbuf);
 288     if (ap_req_server)
 289         krb5_free_principal(context, ap_req_server);
 290     if (ret) {
 291         *minor_status = ret;
 292         return GSS_S_FAILURE;
 293     }
 294
 295     ret = _gsskrb5_encapsulate(minor_status,
 296                                &outbuf,
 297                                output_token,
 298                                "\x03\x00",
 299                                GSS_KRB5_MECHANISM);
 300     krb5_data_free (&outbuf);
 301     if (ret)
 302         return ret;
 303
 304     *minor_status = 0;
 305     return GSS_S_CONTINUE_NEEDED;
 306 }
 307
 308
 309 static OM_uint32
 310 gsskrb5_acceptor_start(OM_uint32 * minor_status,
 311                        gsskrb5_ctx ctx,
 312                        krb5_context context,
 313                        const gss_cred_id_t acceptor_cred_handle,
 314                        const gss_buffer_t input_token_buffer,
 315                        const gss_channel_bindings_t input_chan_bindings,
 316                        gss_name_t * src_name,
 317                        gss_OID * mech_type,
 318                        gss_buffer_t output_token,
 319                        OM_uint32 * ret_flags,
 320                        OM_uint32 * time_rec,
 321                        gss_cred_id_t * delegated_cred_handle)
 322 {
 323     krb5_error_code kret;
 324     OM_uint32 ret = GSS_S_COMPLETE;
 325     krb5_data indata;
 326     krb5_flags ap_options;
 327     krb5_keytab keytab = NULL;
 328     int is_cfx = 0;
 329     const gsskrb5_cred acceptor_cred = (gsskrb5_cred)acceptor_cred_handle;
 330
 331     /*
 332      * We may, or may not, have an escapsulation.
 333      */
 334     ret = _gsskrb5_decapsulate (minor_status,
 335                                 input_token_buffer,
 336                                 &indata,
 337                                 "\x01\x00",
 338                                 GSS_KRB5_MECHANISM);
 339
 340     if (ret) {
 341         /* Assume that there is no OID wrapping. */
 342         indata.length   = input_token_buffer->length;
 343         indata.data     = input_token_buffer->value;
 344     }
 345
 346     /*
 347      * We need to get our keytab
 348      */
 349     if (acceptor_cred == NULL) {
 350         if (_gsskrb5_keytab != NULL)
 351             keytab = _gsskrb5_keytab;
 352     } else if (acceptor_cred->keytab != NULL) {
 353         keytab = acceptor_cred->keytab;
 354     }
 355
 356     /*
 357      * We need to check the ticket and create the AP-REP packet
 358      */
 359
 360     {
 361         krb5_rd_req_in_ctx in = NULL;
 362         krb5_rd_req_out_ctx out = NULL;
 363         krb5_principal server = NULL;
 364
 365         if (acceptor_cred)
 366             server = acceptor_cred->principal;
 367
 368         kret = krb5_rd_req_in_ctx_alloc(context, &in);
 369         if (kret == 0)
 370             kret = krb5_rd_req_in_set_keytab(context, in, keytab);
 371         if (kret) {
 372             if (in)
 373                 krb5_rd_req_in_ctx_free(context, in);
 374             ret = GSS_S_FAILURE;
 375             *minor_status = kret;
 376             return ret;
 377         }
 378
 379         kret = krb5_rd_req_ctx(context,
 380                                &ctx->auth_context,
 381                                &indata,
 382                                server,
 383                                in, &out);
 384         krb5_rd_req_in_ctx_free(context, in);
 385         if (kret) {
 386             /*
 387              * No reply in non-MUTUAL mode, but we don't know that its
 388              * non-MUTUAL mode yet, thats inside the 8003 checksum.
 389              */
 390             return send_error_token(minor_status, context, kret,
 391                                     server, &indata, output_token);
 392         }
 393
 394         /*
 395          * we need to remember some data on the context_handle.
 396          */
 397         kret = krb5_rd_req_out_get_ap_req_options(context, out,
 398                                                   &ap_options);
 399         if (kret == 0)
 400             kret = krb5_rd_req_out_get_ticket(context, out,
 401                                               &ctx->ticket);
 402         if (kret == 0)
 403             kret = krb5_rd_req_out_get_keyblock(context, out,
 404                                                 &ctx->service_keyblock);
 405         ctx->lifetime = ctx->ticket->ticket.endtime;
 406
 407         krb5_rd_req_out_ctx_free(context, out);
 408         if (kret) {
 409             ret = GSS_S_FAILURE;
 410             *minor_status = kret;
 411             return ret;
 412         }
 413     }
 414
 415
 416     /*
 417      * We need to copy the principal names to the context and the
 418      * calling layer.
 419      */
 420     kret = krb5_copy_principal(context,
 421                                ctx->ticket->client,
 422                                &ctx->source);
 423     if (kret) {
 424         ret = GSS_S_FAILURE;
 425         *minor_status = kret;
 426     }
 427
 428     kret = krb5_copy_principal(context,
 429                                ctx->ticket->server,
 430                                &ctx->target);
 431     if (kret) {
 432         ret = GSS_S_FAILURE;
 433         *minor_status = kret;
 434         return ret;
 435     }
 436
 437     /*
 438      * We need to setup some compat stuff, this assumes that
 439      * context_handle->target is already set.
 440      */
 441     ret = _gss_DES3_get_mic_compat(minor_status, ctx, context);
 442     if (ret)
 443         return ret;
 444
 445     if (src_name != NULL) {
 446         kret = krb5_copy_principal (context,
 447                                     ctx->ticket->client,
 448                                     (gsskrb5_name*)src_name);
 449         if (kret) {
 450             ret = GSS_S_FAILURE;
 451             *minor_status = kret;
 452             return ret;
 453         }
 454     }
 455
 456     /*
 457      * We need to get the flags out of the 8003 checksum.
 458      */
 459     {
 460         krb5_authenticator authenticator;
 461
 462         kret = krb5_auth_con_getauthenticator(context,
 463                                               ctx->auth_context,
 464                                               &authenticator);
 465         if(kret) {
 466             ret = GSS_S_FAILURE;
 467             *minor_status = kret;
 468             return ret;
 469         }
 470
 471         if (authenticator->cksum->cksumtype == CKSUMTYPE_GSSAPI) {
 472             ret = _gsskrb5_verify_8003_checksum(minor_status,
 473                                                 input_chan_bindings,
 474                                                 authenticator->cksum,
 475                                                 &ctx->flags,
 476                                                 &ctx->fwd_data);
 477
 478             krb5_free_authenticator(context, &authenticator);
 479             if (ret) {
 480                 return ret;
 481             }
 482         } else {
 483             krb5_crypto crypto;
 484
 485             kret = krb5_crypto_init(context,
 486                                     ctx->auth_context->keyblock,
 487                                     0, &crypto);
 488             if(kret) {
 489                 krb5_free_authenticator(context, &authenticator);
 490
 491                 ret = GSS_S_FAILURE;
 492                 *minor_status = kret;
 493                 return ret;
 494             }
 495
 496             /*
 497              * Windows accepts Samba3's use of a kerberos, rather than
 498              * GSSAPI checksum here
 499              */
 500
 501             kret = krb5_verify_checksum(context,
 502                                         crypto, KRB5_KU_AP_REQ_AUTH_CKSUM, NULL, 0,
 503                                         authenticator->cksum);
 504             krb5_free_authenticator(context, &authenticator);
 505             krb5_crypto_destroy(context, crypto);
 506
 507             if(kret) {
 508                 ret = GSS_S_BAD_SIG;
 509                 *minor_status = kret;
 510                 return ret;
 511             }
 512
 513             /*
 514              * Samba style get some flags (but not DCE-STYLE)
 515              */
 516             ctx->flags =
 517                 GSS_C_MUTUAL_FLAG | GSS_C_REPLAY_FLAG | GSS_C_SEQUENCE_FLAG;
 518         }
 519     }
 520
 521     if(ctx->flags & GSS_C_MUTUAL_FLAG) {
 522         krb5_data outbuf;
 523
 524         _gsskrb5i_is_cfx(ctx, &is_cfx);
 525
 526         if (is_cfx != 0
 527             || (ap_options & AP_OPTS_USE_SUBKEY)) {
 528             kret = krb5_auth_con_addflags(context,
 529                                           ctx->auth_context,
 530                                           KRB5_AUTH_CONTEXT_USE_SUBKEY,
 531                                           NULL);
 532             ctx->more_flags |= ACCEPTOR_SUBKEY;
 533         }
 534
 535         kret = krb5_mk_rep(context,
 536                            ctx->auth_context,
 537                            &outbuf);
 538         if (kret) {
 539             *minor_status = kret;
 540             return GSS_S_FAILURE;
 541         }
 542
 543         if (IS_DCE_STYLE(ctx)) {
 544             output_token->length = outbuf.length;
 545             output_token->value = outbuf.data;
 546         } else {
 547             ret = _gsskrb5_encapsulate(minor_status,
 548                                        &outbuf,
 549                                        output_token,
 550                                        "\x02\x00",
 551                                        GSS_KRB5_MECHANISM);
 552             krb5_data_free (&outbuf);
 553             if (ret)
 554                 return ret;
 555         }
 556     }
 557
 558     ctx->flags |= GSS_C_TRANS_FLAG;
 559
 560     /* Remember the flags */
 561
 562     ctx->lifetime = ctx->ticket->ticket.endtime;
 563     ctx->more_flags |= OPEN;
 564
 565     if (mech_type)
 566         *mech_type = GSS_KRB5_MECHANISM;
 567
 568     if (time_rec) {
 569         ret = _gsskrb5_lifetime_left(minor_status,
 570                                      context,
 571                                      ctx->lifetime,
 572                                      time_rec);
 573         if (ret) {
 574             return ret;
 575         }
 576     }
 577
 578     /*
 579      * When GSS_C_DCE_STYLE is in use, we need ask for a AP-REP from
 580      * the client.
 581      */
 582     if (IS_DCE_STYLE(ctx)) {
 583         /*
 584          * Return flags to caller, but we haven't processed
 585          * delgations yet
 586          */
 587         if (ret_flags)
 588             *ret_flags = (ctx->flags & ~GSS_C_DELEG_FLAG);
 589
 590         ctx->state = ACCEPTOR_WAIT_FOR_DCESTYLE;
 591         return GSS_S_CONTINUE_NEEDED;
 592     }
 593
 594     ret = gsskrb5_acceptor_ready(minor_status, ctx, context,
 595                                  delegated_cred_handle);
 596
 597     if (ret_flags)
 598         *ret_flags = ctx->flags;
 599
 600     return ret;
 601 }
 602
 603 static OM_uint32
 604 acceptor_wait_for_dcestyle(OM_uint32 * minor_status,
 605                            gsskrb5_ctx ctx,
 606                            krb5_context context,
 607                            const gss_cred_id_t acceptor_cred_handle,
 608                            const gss_buffer_t input_token_buffer,
 609                            const gss_channel_bindings_t input_chan_bindings,
 610                            gss_name_t * src_name,
 611                            gss_OID * mech_type,
 612                            gss_buffer_t output_token,
 613                            OM_uint32 * ret_flags,
 614                            OM_uint32 * time_rec,
 615                            gss_cred_id_t * delegated_cred_handle)
 616 {
 617     OM_uint32 ret;
 618     krb5_error_code kret;
 619     krb5_data inbuf;
 620     int32_t r_seq_number, l_seq_number;
 621
 622     /*
 623      * We know it's GSS_C_DCE_STYLE so we don't need to decapsulate the AP_REP
 624      */
 625
 626     inbuf.length = input_token_buffer->length;
 627     inbuf.data = input_token_buffer->value;
 628
 629     /*
 630      * We need to remeber the old remote seq_number, then check if the
 631      * client has replied with our local seq_number, and then reset
 632      * the remote seq_number to the old value
 633      */
 634     {
 635         kret = krb5_auth_con_getlocalseqnumber(context,
 636                                                ctx->auth_context,
 637                                                &l_seq_number);
 638         if (kret) {
 639             *minor_status = kret;
 640             return GSS_S_FAILURE;
 641         }
 642
 643         kret = krb5_auth_getremoteseqnumber(context,
 644                                             ctx->auth_context,
 645                                             &r_seq_number);
 646         if (kret) {
 647             *minor_status = kret;
 648             return GSS_S_FAILURE;
 649         }
 650
 651         kret = krb5_auth_con_setremoteseqnumber(context,
 652                                                 ctx->auth_context,
 653                                                 l_seq_number);
 654         if (kret) {
 655             *minor_status = kret;
 656             return GSS_S_FAILURE;
 657         }
 658     }
 659
 660     /*
 661      * We need to verify the AP_REP, but we need to flag that this is
 662      * DCE_STYLE, so don't check the timestamps this time, but put the
 663      * flag DO_TIME back afterward.
 664     */
 665     {
 666         krb5_ap_rep_enc_part *repl;
 667         int32_t auth_flags;
 668
 669         krb5_auth_con_removeflags(context,
 670                                   ctx->auth_context,
 671                                   KRB5_AUTH_CONTEXT_DO_TIME,
 672                                   &auth_flags);
 673
 674         kret = krb5_rd_rep(context, ctx->auth_context, &inbuf, &repl);
 675         if (kret) {
 676             *minor_status = kret;
 677             return GSS_S_FAILURE;
 678         }
 679         krb5_free_ap_rep_enc_part(context, repl);
 680         krb5_auth_con_setflags(context, ctx->auth_context, auth_flags);
 681     }
 682
 683     /* We need to check the liftime */
 684     {
 685         OM_uint32 lifetime_rec;
 686
 687         ret = _gsskrb5_lifetime_left(minor_status,
 688                                      context,
 689                                      ctx->lifetime,
 690                                      &lifetime_rec);
 691         if (ret) {
 692             return ret;
 693         }
 694         if (lifetime_rec == 0) {
 695             return GSS_S_CONTEXT_EXPIRED;
 696         }
 697
 698         if (time_rec) *time_rec = lifetime_rec;
 699     }
 700
 701     /* We need to give the caller the flags which are in use */
 702     if (ret_flags) *ret_flags = ctx->flags;
 703
 704     if (src_name) {
 705         kret = krb5_copy_principal(context,
 706                                    ctx->source,
 707                                    (gsskrb5_name*)src_name);
 708         if (kret) {
 709             *minor_status = kret;
 710             return GSS_S_FAILURE;
 711         }
 712     }
 713
 714     /*
 715      * After the krb5_rd_rep() the remote and local seq_number should
 716      * be the same, because the client just replies the seq_number
 717      * from our AP-REP in its AP-REP, but then the client uses the
 718      * seq_number from its AP-REQ for GSS_wrap()
 719      */
 720     {
 721         int32_t tmp_r_seq_number, tmp_l_seq_number;
 722
 723         kret = krb5_auth_getremoteseqnumber(context,
 724                                             ctx->auth_context,
 725                                             &tmp_r_seq_number);
 726         if (kret) {
 727             *minor_status = kret;
 728             return GSS_S_FAILURE;
 729         }
 730
 731         kret = krb5_auth_con_getlocalseqnumber(context,
 732                                                ctx->auth_context,
 733                                                &tmp_l_seq_number);
 734         if (kret) {
 735
 736             *minor_status = kret;
 737             return GSS_S_FAILURE;
 738         }
 739
 740         /*
 741          * Here we check if the client has responsed with our local seq_number,
 742          */
 743         if (tmp_r_seq_number != tmp_l_seq_number) {
 744             return GSS_S_UNSEQ_TOKEN;
 745         }
 746     }
 747
 748     /*
 749      * We need to reset the remote seq_number, because the client will use,
 750      * the old one for the GSS_wrap() calls
 751      */
 752     {
 753         kret = krb5_auth_con_setremoteseqnumber(context,
 754                                                 ctx->auth_context,
 755                                                 r_seq_number);
 756         if (kret) {
 757             *minor_status = kret;
 758             return GSS_S_FAILURE;
 759         }
 760     }
 761
 762     return gsskrb5_acceptor_ready(minor_status, ctx, context,
 763                                   delegated_cred_handle);
 764 }
 765
 766
 767 OM_uint32
 768 _gsskrb5_accept_sec_context(OM_uint32 * minor_status,
 769                             gss_ctx_id_t * context_handle,
 770                             const gss_cred_id_t acceptor_cred_handle,
 771                             const gss_buffer_t input_token_buffer,
 772                             const gss_channel_bindings_t input_chan_bindings,
 773                             gss_name_t * src_name,
 774                             gss_OID * mech_type,
 775                             gss_buffer_t output_token,
 776                             OM_uint32 * ret_flags,
 777                             OM_uint32 * time_rec,
 778                             gss_cred_id_t * delegated_cred_handle)
 779 {
 780     krb5_context context;
 781     OM_uint32 ret;
 782     gsskrb5_ctx ctx;
 783
 784     GSSAPI_KRB5_INIT(&context);
 785
 786     output_token->length = 0;
 787     output_token->value = NULL;
 788
 789     if (src_name != NULL)
 790         *src_name = NULL;
 791     if (mech_type)
 792         *mech_type = GSS_KRB5_MECHANISM;
 793
 794     if (*context_handle == GSS_C_NO_CONTEXT) {
 795         ret = _gsskrb5_create_ctx(minor_status,
 796                                   context_handle,
 797                                   context,
 798                                   input_chan_bindings,
 799                                   ACCEPTOR_START);
 800         if (ret)
 801             return ret;
 802     }
 803
 804     ctx = (gsskrb5_ctx)*context_handle;
 805
 806
 807     /*
 808      * TODO: check the channel_bindings
 809      * (above just sets them to krb5 layer)
 810      */
 811
 812     HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
 813
 814     switch (ctx->state) {
 815     case ACCEPTOR_START:
 816         ret = gsskrb5_acceptor_start(minor_status,
 817                                      ctx,
 818                                      context,
 819                                      acceptor_cred_handle,
 820                                      input_token_buffer,
 821                                      input_chan_bindings,
 822                                      src_name,
 823                                      mech_type,
 824                                      output_token,
 825                                      ret_flags,
 826                                      time_rec,
 827                                      delegated_cred_handle);
 828         break;
 829     case ACCEPTOR_WAIT_FOR_DCESTYLE:
 830         ret = acceptor_wait_for_dcestyle(minor_status,
 831                                          ctx,
 832                                          context,
 833                                          acceptor_cred_handle,
 834                                          input_token_buffer,
 835                                          input_chan_bindings,
 836                                          src_name,
 837                                          mech_type,
 838                                          output_token,
 839                                          ret_flags,
 840                                          time_rec,
 841                                          delegated_cred_handle);
 842         break;
 843     case ACCEPTOR_READY:
 844         /*
 845          * If we get there, the caller have called
 846          * gss_accept_sec_context() one time too many.
 847          */
 848         ret =  GSS_S_BAD_STATUS;
 849         break;
 850     default:
 851         /* TODO: is this correct here? --metze */
 852         ret =  GSS_S_BAD_STATUS;
 853         break;
 854     }
 855
 856     HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 857
 858     if (GSS_ERROR(ret)) {
 859         OM_uint32 min2;
 860         _gsskrb5_delete_sec_context(&min2, context_handle, GSS_C_NO_BUFFER);
 861     }
 862
 863     return ret;
 864 }