lib/gssapi/krb5/init_sec_context.c

   1 /*
   2  * Copyright (c) 1997 - 2008 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 "gsskrb5_locl.h"
  35
  36 /*
  37  * copy the addresses from `input_chan_bindings' (if any) to
  38  * the auth context `ac'
  39  */
  40
  41 static OM_uint32
  42 set_addresses (krb5_context context,
  43                krb5_auth_context ac,
  44                const gss_channel_bindings_t input_chan_bindings)
  45 {
  46     /* Port numbers are expected to be in application_data.value,
  47      * initator's port first */
  48
  49     krb5_address initiator_addr, acceptor_addr;
  50     krb5_error_code kret;
  51
  52     if (input_chan_bindings == GSS_C_NO_CHANNEL_BINDINGS
  53         || input_chan_bindings->application_data.length !=
  54         2 * sizeof(ac->local_port))
  55         return 0;
  56
  57     memset(&initiator_addr, 0, sizeof(initiator_addr));
  58     memset(&acceptor_addr, 0, sizeof(acceptor_addr));
  59
  60     ac->local_port =
  61         *(int16_t *) input_chan_bindings->application_data.value;
  62
  63     ac->remote_port =
  64         *((int16_t *) input_chan_bindings->application_data.value + 1);
  65
  66     kret = _gsskrb5i_address_to_krb5addr(context,
  67                                          input_chan_bindings->acceptor_addrtype,
  68                                          &input_chan_bindings->acceptor_address,
  69                                          ac->remote_port,
  70                                          &acceptor_addr);
  71     if (kret)
  72         return kret;
  73
  74     kret = _gsskrb5i_address_to_krb5addr(context,
  75                                          input_chan_bindings->initiator_addrtype,
  76                                          &input_chan_bindings->initiator_address,
  77                                          ac->local_port,
  78                                          &initiator_addr);
  79     if (kret) {
  80         krb5_free_address (context, &acceptor_addr);
  81         return kret;
  82     }
  83
  84     kret = krb5_auth_con_setaddrs(context,
  85                                   ac,
  86                                   &initiator_addr,  /* local address */
  87                                   &acceptor_addr);  /* remote address */
  88
  89     krb5_free_address (context, &initiator_addr);
  90     krb5_free_address (context, &acceptor_addr);
  91
  92 #if 0
  93     free(input_chan_bindings->application_data.value);
  94     input_chan_bindings->application_data.value = NULL;
  95     input_chan_bindings->application_data.length = 0;
  96 #endif
  97
  98     return kret;
  99 }
 100
 101 OM_uint32
 102 _gsskrb5_create_ctx(
 103         OM_uint32 * minor_status,
 104         gss_ctx_id_t * context_handle,
 105         krb5_context context,
 106         const gss_channel_bindings_t input_chan_bindings,
 107         enum gss_ctx_id_t_state state)
 108 {
 109     krb5_error_code kret;
 110     gsskrb5_ctx ctx;
 111
 112     *context_handle = NULL;
 113
 114     ctx = malloc(sizeof(*ctx));
 115     if (ctx == NULL) {
 116         *minor_status = ENOMEM;
 117         return GSS_S_FAILURE;
 118     }
 119     ctx->auth_context           = NULL;
 120     ctx->source                 = NULL;
 121     ctx->target                 = NULL;
 122     ctx->kcred                  = NULL;
 123     ctx->ccache                 = NULL;
 124     ctx->state                  = state;
 125     ctx->flags                  = 0;
 126     ctx->more_flags             = 0;
 127     ctx->service_keyblock       = NULL;
 128     ctx->ticket                 = NULL;
 129     krb5_data_zero(&ctx->fwd_data);
 130     ctx->lifetime               = GSS_C_INDEFINITE;
 131     ctx->order                  = NULL;
 132     ctx->crypto                 = NULL;
 133     HEIMDAL_MUTEX_init(&ctx->ctx_id_mutex);
 134
 135     kret = krb5_auth_con_init (context, &ctx->auth_context);
 136     if (kret) {
 137         *minor_status = kret;
 138         HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex);
 139         return GSS_S_FAILURE;
 140     }
 141
 142     kret = set_addresses(context, ctx->auth_context, input_chan_bindings);
 143     if (kret) {
 144         *minor_status = kret;
 145
 146         HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex);
 147
 148         krb5_auth_con_free(context, ctx->auth_context);
 149
 150         return GSS_S_BAD_BINDINGS;
 151     }
 152
 153     /*
 154      * We need a sequence number
 155      */
 156
 157     krb5_auth_con_addflags(context,
 158                            ctx->auth_context,
 159                            KRB5_AUTH_CONTEXT_DO_SEQUENCE |
 160                            KRB5_AUTH_CONTEXT_CLEAR_FORWARDED_CRED,
 161                            NULL);
 162
 163     *context_handle = (gss_ctx_id_t)ctx;
 164
 165     return GSS_S_COMPLETE;
 166 }
 167
 168
 169 static OM_uint32
 170 gsskrb5_get_creds(
 171         OM_uint32 * minor_status,
 172         krb5_context context,
 173         krb5_ccache ccache,
 174         gsskrb5_ctx ctx,
 175         const gss_name_t target_name,
 176         int use_dns,
 177         OM_uint32 time_req,
 178         OM_uint32 * time_rec)
 179 {
 180     OM_uint32 ret;
 181     krb5_error_code kret;
 182     krb5_creds this_cred;
 183     OM_uint32 lifetime_rec;
 184
 185     if (ctx->target) {
 186         krb5_free_principal(context, ctx->target);
 187         ctx->target = NULL;
 188     }
 189     if (ctx->kcred) {
 190         krb5_free_creds(context, ctx->kcred);
 191         ctx->kcred = NULL;
 192     }
 193
 194     ret = _gsskrb5_canon_name(minor_status, context, use_dns,
 195                               ctx->source, target_name, &ctx->target);
 196     if (ret)
 197         return ret;
 198
 199     memset(&this_cred, 0, sizeof(this_cred));
 200     this_cred.client = ctx->source;
 201     this_cred.server = ctx->target;
 202
 203     if (time_req && time_req != GSS_C_INDEFINITE) {
 204         krb5_timestamp ts;
 205
 206         krb5_timeofday (context, &ts);
 207         this_cred.times.endtime = ts + time_req;
 208     } else {
 209         this_cred.times.endtime   = 0;
 210     }
 211
 212     this_cred.session.keytype = KEYTYPE_NULL;
 213
 214     kret = krb5_get_credentials(context,
 215                                 0,
 216                                 ccache,
 217                                 &this_cred,
 218                                 &ctx->kcred);
 219     if (kret) {
 220         *minor_status = kret;
 221         return GSS_S_FAILURE;
 222     }
 223
 224     ctx->lifetime = ctx->kcred->times.endtime;
 225
 226     ret = _gsskrb5_lifetime_left(minor_status, context,
 227                                  ctx->lifetime, &lifetime_rec);
 228     if (ret) return ret;
 229
 230     if (lifetime_rec == 0) {
 231         *minor_status = 0;
 232         return GSS_S_CONTEXT_EXPIRED;
 233     }
 234
 235     if (time_rec) *time_rec = lifetime_rec;
 236
 237     return GSS_S_COMPLETE;
 238 }
 239
 240 static OM_uint32
 241 gsskrb5_initiator_ready(
 242         OM_uint32 * minor_status,
 243         gsskrb5_ctx ctx,
 244         krb5_context context)
 245 {
 246     OM_uint32 ret;
 247     int32_t seq_number;
 248     int is_cfx = 0;
 249     OM_uint32 flags = ctx->flags;
 250
 251     krb5_free_creds(context, ctx->kcred);
 252     ctx->kcred = NULL;
 253
 254     if (ctx->more_flags & CLOSE_CCACHE)
 255         krb5_cc_close(context, ctx->ccache);
 256     ctx->ccache = NULL;
 257
 258     krb5_auth_getremoteseqnumber (context, ctx->auth_context, &seq_number);
 259
 260     _gsskrb5i_is_cfx(context, ctx, 0);
 261     is_cfx = (ctx->more_flags & IS_CFX);
 262
 263     ret = _gssapi_msg_order_create(minor_status,
 264                                    &ctx->order,
 265                                    _gssapi_msg_order_f(flags),
 266                                    seq_number, 0, is_cfx);
 267     if (ret) return ret;
 268
 269     ctx->state  = INITIATOR_READY;
 270     ctx->more_flags     |= OPEN;
 271
 272     return GSS_S_COMPLETE;
 273 }
 274
 275 /*
 276  * handle delegated creds in init-sec-context
 277  */
 278
 279 static void
 280 do_delegation (krb5_context context,
 281                krb5_auth_context ac,
 282                krb5_ccache ccache,
 283                krb5_creds *cred,
 284                krb5_const_principal name,
 285                krb5_data *fwd_data,
 286                uint32_t flagmask,
 287                uint32_t *flags)
 288 {
 289     krb5_creds creds;
 290     KDCOptions fwd_flags;
 291     krb5_error_code kret;
 292
 293     memset (&creds, 0, sizeof(creds));
 294     krb5_data_zero (fwd_data);
 295
 296     kret = krb5_cc_get_principal(context, ccache, &creds.client);
 297     if (kret)
 298         goto out;
 299
 300     kret = krb5_make_principal(context,
 301                                &creds.server,
 302                                creds.client->realm,
 303                                KRB5_TGS_NAME,
 304                                creds.client->realm,
 305                                NULL);
 306     if (kret)
 307         goto out;
 308
 309     creds.times.endtime = 0;
 310
 311     memset(&fwd_flags, 0, sizeof(fwd_flags));
 312     fwd_flags.forwarded = 1;
 313     fwd_flags.forwardable = 1;
 314
 315     if ( /*target_name->name.name_type != KRB5_NT_SRV_HST ||*/
 316         name->name.name_string.len < 2)
 317         goto out;
 318
 319     kret = krb5_get_forwarded_creds(context,
 320                                     ac,
 321                                     ccache,
 322                                     KDCOptions2int(fwd_flags),
 323                                     name->name.name_string.val[1],
 324                                     &creds,
 325                                     fwd_data);
 326
 327  out:
 328     if (kret)
 329         *flags &= ~flagmask;
 330     else
 331         *flags |= flagmask;
 332
 333     if (creds.client)
 334         krb5_free_principal(context, creds.client);
 335     if (creds.server)
 336         krb5_free_principal(context, creds.server);
 337 }
 338
 339 /*
 340  * first stage of init-sec-context
 341  */
 342
 343 static OM_uint32
 344 init_auth
 345 (OM_uint32 * minor_status,
 346  gsskrb5_cred cred,
 347  gsskrb5_ctx ctx,
 348  krb5_context context,
 349  gss_name_t name,
 350  const gss_OID mech_type,
 351  OM_uint32 req_flags,
 352  OM_uint32 time_req,
 353  const gss_buffer_t input_token,
 354  gss_OID * actual_mech_type,
 355  gss_buffer_t output_token,
 356  OM_uint32 * ret_flags,
 357  OM_uint32 * time_rec
 358     )
 359 {
 360     OM_uint32 ret = GSS_S_FAILURE;
 361     krb5_error_code kret;
 362     krb5_data outbuf;
 363     krb5_data fwd_data;
 364     OM_uint32 lifetime_rec;
 365     int allow_dns = 1;
 366
 367     krb5_data_zero(&outbuf);
 368     krb5_data_zero(&fwd_data);
 369
 370     *minor_status = 0;
 371
 372     if (actual_mech_type)
 373         *actual_mech_type = GSS_KRB5_MECHANISM;
 374
 375     if (cred == NULL) {
 376         kret = krb5_cc_default (context, &ctx->ccache);
 377         if (kret) {
 378             *minor_status = kret;
 379             ret = GSS_S_FAILURE;
 380             goto failure;
 381         }
 382         ctx->more_flags |= CLOSE_CCACHE;
 383     } else
 384         ctx->ccache = cred->ccache;
 385
 386     kret = krb5_cc_get_principal (context, ctx->ccache, &ctx->source);
 387     if (kret) {
 388         *minor_status = kret;
 389         ret = GSS_S_FAILURE;
 390         goto failure;
 391     }
 392
 393     ret = _gss_DES3_get_mic_compat(minor_status, ctx, context);
 394     if (ret)
 395         goto failure;
 396
 397
 398     /*
 399      * This is hideous glue for (NFS) clients that wants to limit the
 400      * available enctypes to what it can support (encryption in
 401      * kernel). If there is no enctypes selected for this credential,
 402      * reset it to the default set of enctypes.
 403      */
 404     {
 405         krb5_enctype *enctypes = NULL;
 406
 407         if (cred && cred->enctypes)
 408             enctypes = cred->enctypes;
 409         krb5_set_default_in_tkt_etypes(context, enctypes);
 410     }
 411
 412     /* canon name if needed for client + target realm */
 413     kret = krb5_cc_get_config(context, ctx->ccache, NULL,
 414                               "realm-config", &outbuf);
 415     if (kret == 0) {
 416         /* XXX 2 is no server canon */
 417         if (outbuf.length < 1 || ((((unsigned char *)outbuf.data)[0]) & 2))
 418             allow_dns = 0;
 419         krb5_data_free(&outbuf);
 420     }
 421
 422     /*
 423      * First we try w/o dns, hope that the KDC have register alias
 424      * (and referrals if cross realm) for this principal. If that
 425      * fails and if we are allowed to using this realm try again with
 426      * DNS canonicalizion.
 427      */
 428     ret = gsskrb5_get_creds(minor_status, context, ctx->ccache,
 429                             ctx, name, 0, time_req,
 430                             time_rec);
 431     if (ret && allow_dns)
 432         ret = gsskrb5_get_creds(minor_status, context, ctx->ccache,
 433                                 ctx, name, 1, time_req,
 434                                 time_rec);
 435     if (ret)
 436         goto failure;
 437
 438     ctx->lifetime = ctx->kcred->times.endtime;
 439
 440     ret = _gsskrb5_lifetime_left(minor_status,
 441                                  context,
 442                                  ctx->lifetime,
 443                                  &lifetime_rec);
 444     if (ret)
 445         goto failure;
 446
 447     if (lifetime_rec == 0) {
 448         *minor_status = 0;
 449         ret = GSS_S_CONTEXT_EXPIRED;
 450         goto failure;
 451     }
 452
 453     krb5_auth_con_setkey(context,
 454                          ctx->auth_context,
 455                          &ctx->kcred->session);
 456
 457     kret = krb5_auth_con_generatelocalsubkey(context,
 458                                              ctx->auth_context,
 459                                              &ctx->kcred->session);
 460     if(kret) {
 461         *minor_status = kret;
 462         ret = GSS_S_FAILURE;
 463         goto failure;
 464     }
 465
 466     return GSS_S_COMPLETE;
 467
 468 failure:
 469     if (ctx->ccache && (ctx->more_flags & CLOSE_CCACHE))
 470         krb5_cc_close(context, ctx->ccache);
 471     ctx->ccache = NULL;
 472
 473     return ret;
 474
 475 }
 476
 477 static OM_uint32
 478 init_auth_restart
 479 (OM_uint32 * minor_status,
 480  gsskrb5_cred cred,
 481  gsskrb5_ctx ctx,
 482  krb5_context context,
 483  OM_uint32 req_flags,
 484  const gss_channel_bindings_t input_chan_bindings,
 485  const gss_buffer_t input_token,
 486  gss_OID * actual_mech_type,
 487  gss_buffer_t output_token,
 488  OM_uint32 * ret_flags,
 489  OM_uint32 * time_rec
 490     )
 491 {
 492     OM_uint32 ret = GSS_S_FAILURE;
 493     krb5_error_code kret;
 494     krb5_flags ap_options;
 495     krb5_data outbuf;
 496     uint32_t flags;
 497     krb5_data authenticator;
 498     Checksum cksum;
 499     krb5_enctype enctype;
 500     krb5_data fwd_data, timedata;
 501     int32_t offset = 0, oldoffset;
 502     uint32_t flagmask;
 503
 504     krb5_data_zero(&outbuf);
 505     krb5_data_zero(&fwd_data);
 506
 507     *minor_status = 0;
 508
 509     /*
 510      * If the credential doesn't have ok-as-delegate, check if there
 511      * is a realm setting and use that.
 512      */
 513     if (!ctx->kcred->flags.b.ok_as_delegate) {
 514         krb5_data data;
 515
 516         ret = krb5_cc_get_config(context, ctx->ccache, NULL,
 517                                  "realm-config", &data);
 518         if (ret == 0) {
 519             /* XXX 1 is use ok-as-delegate */
 520             if (data.length < 1 || ((((unsigned char *)data.data)[0]) & 1) == 0)
 521                 req_flags &= ~(GSS_C_DELEG_FLAG|GSS_C_DELEG_POLICY_FLAG);
 522             krb5_data_free(&data);
 523         }
 524     }
 525
 526     flagmask = 0;
 527
 528     /* if we used GSS_C_DELEG_POLICY_FLAG, trust KDC */
 529     if ((req_flags & GSS_C_DELEG_POLICY_FLAG)
 530         && ctx->kcred->flags.b.ok_as_delegate)
 531         flagmask |= GSS_C_DELEG_FLAG | GSS_C_DELEG_POLICY_FLAG;
 532     /* if there still is a GSS_C_DELEG_FLAG, use that */
 533     if (req_flags & GSS_C_DELEG_FLAG)
 534         flagmask |= GSS_C_DELEG_FLAG;
 535
 536
 537     flags = 0;
 538     ap_options = 0;
 539     if (flagmask & GSS_C_DELEG_FLAG) {
 540         do_delegation (context,
 541                        ctx->auth_context,
 542                        ctx->ccache, ctx->kcred, ctx->target,
 543                        &fwd_data, flagmask, &flags);
 544     }
 545
 546     if (req_flags & GSS_C_MUTUAL_FLAG) {
 547         flags |= GSS_C_MUTUAL_FLAG;
 548         ap_options |= AP_OPTS_MUTUAL_REQUIRED;
 549     }
 550
 551     if (req_flags & GSS_C_REPLAY_FLAG)
 552         flags |= GSS_C_REPLAY_FLAG;
 553     if (req_flags & GSS_C_SEQUENCE_FLAG)
 554         flags |= GSS_C_SEQUENCE_FLAG;
 555 #if 0
 556     if (req_flags & GSS_C_ANON_FLAG)
 557         ;                               /* XXX */
 558 #endif
 559     if (req_flags & GSS_C_DCE_STYLE) {
 560         /* GSS_C_DCE_STYLE implies GSS_C_MUTUAL_FLAG */
 561         flags |= GSS_C_DCE_STYLE | GSS_C_MUTUAL_FLAG;
 562         ap_options |= AP_OPTS_MUTUAL_REQUIRED;
 563     }
 564     if (req_flags & GSS_C_IDENTIFY_FLAG)
 565         flags |= GSS_C_IDENTIFY_FLAG;
 566     if (req_flags & GSS_C_EXTENDED_ERROR_FLAG)
 567         flags |= GSS_C_EXTENDED_ERROR_FLAG;
 568
 569     if (req_flags & GSS_C_CONF_FLAG) {
 570         flags |= GSS_C_CONF_FLAG;
 571     }
 572     if (req_flags & GSS_C_INTEG_FLAG) {
 573         flags |= GSS_C_INTEG_FLAG;
 574     }
 575     if (cred == NULL || !(cred->cred_flags & GSS_CF_NO_CI_FLAGS)) {
 576         flags |= GSS_C_CONF_FLAG;
 577         flags |= GSS_C_INTEG_FLAG;
 578     }
 579     flags |= GSS_C_TRANS_FLAG;
 580
 581     if (ret_flags)
 582         *ret_flags = flags;
 583     ctx->flags = flags;
 584     ctx->more_flags |= LOCAL;
 585
 586     ret = _gsskrb5_create_8003_checksum (minor_status,
 587                                          input_chan_bindings,
 588                                          flags,
 589                                          &fwd_data,
 590                                          &cksum);
 591     krb5_data_free (&fwd_data);
 592     if (ret)
 593         goto failure;
 594
 595     enctype = ctx->auth_context->keyblock->keytype;
 596
 597     ret = krb5_cc_get_config(context, ctx->ccache, ctx->target,
 598                              "time-offset", &timedata);
 599     if (ret == 0) {
 600         if (timedata.length == 4) {
 601             const u_char *p = timedata.data;
 602             offset = (p[0] <<24) | (p[1] << 16) | (p[2] << 8) | (p[3] << 0);
 603         }
 604         krb5_data_free(&timedata);
 605     }
 606
 607     if (offset) {
 608         krb5_get_kdc_sec_offset (context, &oldoffset, NULL);
 609         krb5_set_kdc_sec_offset (context, offset, -1);
 610     }
 611
 612     kret = _krb5_build_authenticator(context,
 613                                      ctx->auth_context,
 614                                      enctype,
 615                                      ctx->kcred,
 616                                      &cksum,
 617                                      &authenticator,
 618                                      KRB5_KU_AP_REQ_AUTH);
 619
 620     if (kret) {
 621         if (offset)
 622             krb5_set_kdc_sec_offset (context, oldoffset, -1);
 623         *minor_status = kret;
 624         ret = GSS_S_FAILURE;
 625         goto failure;
 626     }
 627
 628     kret = krb5_build_ap_req (context,
 629                               enctype,
 630                               ctx->kcred,
 631                               ap_options,
 632                               authenticator,
 633                               &outbuf);
 634     if (offset)
 635         krb5_set_kdc_sec_offset (context, oldoffset, -1);
 636     if (kret) {
 637         *minor_status = kret;
 638         ret = GSS_S_FAILURE;
 639         goto failure;
 640     }
 641
 642     if (flags & GSS_C_DCE_STYLE) {
 643         output_token->value = outbuf.data;
 644         output_token->length = outbuf.length;
 645     } else {
 646         ret = _gsskrb5_encapsulate (minor_status, &outbuf, output_token,
 647                                     (u_char *)"\x01\x00", GSS_KRB5_MECHANISM);
 648         krb5_data_free (&outbuf);
 649         if (ret)
 650             goto failure;
 651     }
 652
 653     free_Checksum(&cksum);
 654
 655     if (flags & GSS_C_MUTUAL_FLAG) {
 656         ctx->state = INITIATOR_WAIT_FOR_MUTAL;
 657         return GSS_S_CONTINUE_NEEDED;
 658     }
 659
 660     return gsskrb5_initiator_ready(minor_status, ctx, context);
 661 failure:
 662     if (ctx->ccache && (ctx->more_flags & CLOSE_CCACHE))
 663         krb5_cc_close(context, ctx->ccache);
 664     ctx->ccache = NULL;
 665
 666     return ret;
 667 }
 668
 669
 670 static OM_uint32
 671 repl_mutual
 672 (OM_uint32 * minor_status,
 673  gsskrb5_ctx ctx,
 674  krb5_context context,
 675  const gss_OID mech_type,
 676  OM_uint32 req_flags,
 677  OM_uint32 time_req,
 678  const gss_channel_bindings_t input_chan_bindings,
 679  const gss_buffer_t input_token,
 680  gss_OID * actual_mech_type,
 681  gss_buffer_t output_token,
 682  OM_uint32 * ret_flags,
 683  OM_uint32 * time_rec
 684     )
 685 {
 686     OM_uint32 ret;
 687     krb5_error_code kret;
 688     krb5_data indata;
 689     krb5_ap_rep_enc_part *repl;
 690
 691     output_token->length = 0;
 692     output_token->value = NULL;
 693
 694     if (actual_mech_type)
 695         *actual_mech_type = GSS_KRB5_MECHANISM;
 696
 697     if (IS_DCE_STYLE(ctx)) {
 698         /* There is no OID wrapping. */
 699         indata.length   = input_token->length;
 700         indata.data     = input_token->value;
 701     } else {
 702         ret = _gsskrb5_decapsulate (minor_status,
 703                                     input_token,
 704                                     &indata,
 705                                     "\x02\x00",
 706                                     GSS_KRB5_MECHANISM);
 707         if (ret == GSS_S_DEFECTIVE_TOKEN) {
 708             /* check if there is an error token sent instead */
 709             ret = _gsskrb5_decapsulate (minor_status,
 710                                         input_token,
 711                                         &indata,
 712                                         "\x03\x00",
 713                                         GSS_KRB5_MECHANISM);
 714             if (ret == GSS_S_COMPLETE) {
 715                 KRB_ERROR error;
 716
 717                 kret = krb5_rd_error(context, &indata, &error);
 718                 if (kret == 0) {
 719                     kret = krb5_error_from_rd_error(context, &error, NULL);
 720
 721                     /* save the time skrew for this host */
 722                     if (kret == KRB5KRB_AP_ERR_SKEW) {
 723                         krb5_data timedata;
 724                         unsigned char p[4];
 725                         int32_t t = error.stime - time(NULL);
 726
 727                         p[0] = (t >> 24) & 0xFF;
 728                         p[1] = (t >> 16) & 0xFF;
 729                         p[2] = (t >> 8)  & 0xFF;
 730                         p[3] = (t >> 0)  & 0xFF;
 731
 732                         timedata.data = p;
 733                         timedata.length = sizeof(p);
 734
 735                         krb5_cc_set_config(context, ctx->ccache, ctx->target,
 736                                            "time-offset", &timedata);
 737
 738                         if ((ctx->more_flags & RETRIED) == 0)
 739                             ctx->state = INITIATOR_RESTART;
 740                         ctx->more_flags |= RETRIED;
 741                     }
 742                     free_KRB_ERROR (&error);
 743                 }
 744                 *minor_status = kret;
 745                 return GSS_S_FAILURE;
 746             }
 747             return ret;
 748         }
 749     }
 750
 751     kret = krb5_rd_rep (context,
 752                         ctx->auth_context,
 753                         &indata,
 754                         &repl);
 755     if (kret) {
 756         *minor_status = kret;
 757         return GSS_S_FAILURE;
 758     }
 759     krb5_free_ap_rep_enc_part (context,
 760                                repl);
 761
 762     *minor_status = 0;
 763     if (time_rec) {
 764         ret = _gsskrb5_lifetime_left(minor_status,
 765                                      context,
 766                                      ctx->lifetime,
 767                                      time_rec);
 768     } else {
 769         ret = GSS_S_COMPLETE;
 770     }
 771     if (ret_flags)
 772         *ret_flags = ctx->flags;
 773
 774     if (req_flags & GSS_C_DCE_STYLE) {
 775         int32_t local_seq, remote_seq;
 776         krb5_data outbuf;
 777
 778         /*
 779          * So DCE_STYLE is strange. The client echos the seq number
 780          * that the server used in the server's mk_rep in its own
 781          * mk_rep(). After when done, it resets to it's own seq number
 782          * for the gss_wrap calls.
 783          */
 784
 785         krb5_auth_getremoteseqnumber(context, ctx->auth_context, &remote_seq);
 786         krb5_auth_con_getlocalseqnumber(context, ctx->auth_context, &local_seq);
 787         krb5_auth_con_setlocalseqnumber(context, ctx->auth_context, remote_seq);
 788
 789         kret = krb5_mk_rep(context, ctx->auth_context, &outbuf);
 790         if (kret) {
 791             *minor_status = kret;
 792             return GSS_S_FAILURE;
 793         }
 794
 795         /* reset local seq number */
 796         krb5_auth_con_setlocalseqnumber(context, ctx->auth_context, local_seq);
 797
 798         output_token->length = outbuf.length;
 799         output_token->value  = outbuf.data;
 800     }
 801
 802     return gsskrb5_initiator_ready(minor_status, ctx, context);
 803 }
 804
 805 /*
 806  * gss_init_sec_context
 807  */
 808
 809 OM_uint32 _gsskrb5_init_sec_context
 810 (OM_uint32 * minor_status,
 811  const gss_cred_id_t cred_handle,
 812  gss_ctx_id_t * context_handle,
 813  const gss_name_t target_name,
 814  const gss_OID mech_type,
 815  OM_uint32 req_flags,
 816  OM_uint32 time_req,
 817  const gss_channel_bindings_t input_chan_bindings,
 818  const gss_buffer_t input_token,
 819  gss_OID * actual_mech_type,
 820  gss_buffer_t output_token,
 821  OM_uint32 * ret_flags,
 822  OM_uint32 * time_rec
 823     )
 824 {
 825     krb5_context context;
 826     gsskrb5_cred cred = (gsskrb5_cred)cred_handle;
 827     gsskrb5_ctx ctx;
 828     OM_uint32 ret;
 829
 830     GSSAPI_KRB5_INIT (&context);
 831
 832     output_token->length = 0;
 833     output_token->value  = NULL;
 834
 835     if (context_handle == NULL) {
 836         *minor_status = 0;
 837         return GSS_S_FAILURE | GSS_S_CALL_BAD_STRUCTURE;
 838     }
 839
 840     if (ret_flags)
 841         *ret_flags = 0;
 842     if (time_rec)
 843         *time_rec = 0;
 844
 845     if (target_name == GSS_C_NO_NAME) {
 846         if (actual_mech_type)
 847             *actual_mech_type = GSS_C_NO_OID;
 848         *minor_status = 0;
 849         return GSS_S_BAD_NAME;
 850     }
 851
 852     if (mech_type != GSS_C_NO_OID &&
 853         !gss_oid_equal(mech_type, GSS_KRB5_MECHANISM))
 854         return GSS_S_BAD_MECH;
 855
 856     if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
 857         OM_uint32 ret;
 858
 859         if (*context_handle != GSS_C_NO_CONTEXT) {
 860             *minor_status = 0;
 861             return GSS_S_FAILURE | GSS_S_CALL_BAD_STRUCTURE;
 862         }
 863
 864         ret = _gsskrb5_create_ctx(minor_status,
 865                                   context_handle,
 866                                   context,
 867                                   input_chan_bindings,
 868                                   INITIATOR_START);
 869         if (ret)
 870             return ret;
 871     }
 872
 873     if (*context_handle == GSS_C_NO_CONTEXT) {
 874         *minor_status = 0;
 875         return GSS_S_FAILURE | GSS_S_CALL_BAD_STRUCTURE;
 876     }
 877
 878     ctx = (gsskrb5_ctx) *context_handle;
 879
 880     HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
 881
 882  again:
 883     switch (ctx->state) {
 884     case INITIATOR_START:
 885         ret = init_auth(minor_status,
 886                         cred,
 887                         ctx,
 888                         context,
 889                         target_name,
 890                         mech_type,
 891                         req_flags,
 892                         time_req,
 893                         input_token,
 894                         actual_mech_type,
 895                         output_token,
 896                         ret_flags,
 897                         time_rec);
 898         if (ret != GSS_S_COMPLETE)
 899             break;
 900         /* FALL THOUGH */
 901     case INITIATOR_RESTART:
 902         ret = init_auth_restart(minor_status,
 903                                 cred,
 904                                 ctx,
 905                                 context,
 906                                 req_flags,
 907                                 input_chan_bindings,
 908                                 input_token,
 909                                 actual_mech_type,
 910                                 output_token,
 911                                 ret_flags,
 912                                 time_rec);
 913         break;
 914     case INITIATOR_WAIT_FOR_MUTAL:
 915         ret = repl_mutual(minor_status,
 916                           ctx,
 917                           context,
 918                           mech_type,
 919                           req_flags,
 920                           time_req,
 921                           input_chan_bindings,
 922                           input_token,
 923                           actual_mech_type,
 924                           output_token,
 925                           ret_flags,
 926                           time_rec);
 927         if (ctx->state == INITIATOR_RESTART)
 928             goto again;
 929         break;
 930     case INITIATOR_READY:
 931         /*
 932          * If we get there, the caller have called
 933          * gss_init_sec_context() one time too many.
 934          */
 935         _gsskrb5_set_status(EINVAL, "init_sec_context "
 936                             "called one time too many");
 937         *minor_status = EINVAL;
 938         ret = GSS_S_BAD_STATUS;
 939         break;
 940     default:
 941         _gsskrb5_set_status(EINVAL, "init_sec_context "
 942                             "invalid state %d for client",
 943                             (int)ctx->state);
 944         *minor_status = EINVAL;
 945         ret = GSS_S_BAD_STATUS;
 946         break;
 947     }
 948     HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 949
 950     /* destroy context in case of error */
 951     if (GSS_ERROR(ret)) {
 952         OM_uint32 min2;
 953         _gsskrb5_delete_sec_context(&min2, context_handle, GSS_C_NO_BUFFER);
 954     }
 955
 956     return ret;
 957
 958 }