summaryrefslogtreecommitdiff
path: root/source4/heimdal/lib/gssapi/krb5/init_sec_context.c
blob: 35ab9dd88d3abbfb353dbe6030a02e12a3b93d53 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
/*
 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "gsskrb5_locl.h"

/*
 * copy the addresses from `input_chan_bindings' (if any) to
 * the auth context `ac'
 */

static OM_uint32
set_addresses (krb5_context context,
	       krb5_auth_context ac,
	       const gss_channel_bindings_t input_chan_bindings)	
{
    /* Port numbers are expected to be in application_data.value,
     * initator's port first */

    krb5_address initiator_addr, acceptor_addr;
    krb5_error_code kret;

    if (input_chan_bindings == GSS_C_NO_CHANNEL_BINDINGS
	|| input_chan_bindings->application_data.length !=
	2 * sizeof(ac->local_port))
	return 0;

    memset(&initiator_addr, 0, sizeof(initiator_addr));
    memset(&acceptor_addr, 0, sizeof(acceptor_addr));

    ac->local_port =
	*(int16_t *) input_chan_bindings->application_data.value;

    ac->remote_port =
	*((int16_t *) input_chan_bindings->application_data.value + 1);

    kret = _gsskrb5i_address_to_krb5addr(context,
					 input_chan_bindings->acceptor_addrtype,
					 &input_chan_bindings->acceptor_address,
					 ac->remote_port,
					 &acceptor_addr);
    if (kret)
	return kret;

    kret = _gsskrb5i_address_to_krb5addr(context,
					 input_chan_bindings->initiator_addrtype,
					 &input_chan_bindings->initiator_address,
					 ac->local_port,
					 &initiator_addr);
    if (kret) {
	krb5_free_address (context, &acceptor_addr);
	return kret;
    }

    kret = krb5_auth_con_setaddrs(context,
				  ac,
				  &initiator_addr,  /* local address */
				  &acceptor_addr);  /* remote address */

    krb5_free_address (context, &initiator_addr);
    krb5_free_address (context, &acceptor_addr);

#if 0
    free(input_chan_bindings->application_data.value);
    input_chan_bindings->application_data.value = NULL;
    input_chan_bindings->application_data.length = 0;
#endif

    return kret;
}

OM_uint32
_gsskrb5_create_ctx(
        OM_uint32 * minor_status,
	gss_ctx_id_t * context_handle,
	krb5_context context,
 	const gss_channel_bindings_t input_chan_bindings,
 	enum gss_ctx_id_t_state state)
{
    krb5_error_code kret;
    gsskrb5_ctx ctx;

    *context_handle = NULL;

    ctx = malloc(sizeof(*ctx));
    if (ctx == NULL) {
	*minor_status = ENOMEM;
	return GSS_S_FAILURE;
    }
    ctx->auth_context		= NULL;
    ctx->source			= NULL;
    ctx->target			= NULL;
    ctx->kcred			= NULL;
    ctx->ccache			= NULL;
    ctx->state			= state;
    ctx->flags			= 0;
    ctx->more_flags		= 0;
    ctx->service_keyblock	= NULL;
    ctx->ticket			= NULL;
    krb5_data_zero(&ctx->fwd_data);
    ctx->lifetime		= GSS_C_INDEFINITE;
    ctx->order			= NULL;
    ctx->crypto			= NULL;
    HEIMDAL_MUTEX_init(&ctx->ctx_id_mutex);

    kret = krb5_auth_con_init (context, &ctx->auth_context);
    if (kret) {
	*minor_status = kret;
	HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex);
	return GSS_S_FAILURE;
    }

    kret = set_addresses(context, ctx->auth_context, input_chan_bindings);
    if (kret) {
	*minor_status = kret;

	HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex);

	krb5_auth_con_free(context, ctx->auth_context);

	return GSS_S_BAD_BINDINGS;
    }

    /*
     * We need a sequence number
     */

    krb5_auth_con_addflags(context,
			   ctx->auth_context,
			   KRB5_AUTH_CONTEXT_DO_SEQUENCE |
			   KRB5_AUTH_CONTEXT_CLEAR_FORWARDED_CRED,
			   NULL);

    *context_handle = (gss_ctx_id_t)ctx;

    return GSS_S_COMPLETE;
}


static OM_uint32
gsskrb5_get_creds(
        OM_uint32 * minor_status,
	krb5_context context,
	krb5_ccache ccache,
	gsskrb5_ctx ctx,
	const gss_name_t target_name,
	int use_dns,
	OM_uint32 time_req,
	OM_uint32 * time_rec,
	krb5_creds ** cred)
{
    OM_uint32 ret;
    krb5_error_code kret;
    krb5_creds this_cred;
    OM_uint32 lifetime_rec;

    *cred = NULL;

    if (ctx->target) {
	krb5_free_principal(context, ctx->target);
	ctx->target = NULL;
    }

    ret = _gsskrb5_canon_name(minor_status, context, use_dns,
			      target_name, &ctx->target);
    if (ret)
	return ret;

    memset(&this_cred, 0, sizeof(this_cred));
    this_cred.client = ctx->source;
    this_cred.server = ctx->target;

    if (time_req && time_req != GSS_C_INDEFINITE) {
	krb5_timestamp ts;

	krb5_timeofday (context, &ts);
	this_cred.times.endtime = ts + time_req;
    } else {
	this_cred.times.endtime   = 0;
    }

    this_cred.session.keytype = KEYTYPE_NULL;

    kret = krb5_get_credentials(context,
				0,
				ccache,
				&this_cred,
				cred);
    if (kret) {
	*minor_status = kret;
	return GSS_S_FAILURE;
    }

    ctx->lifetime = (*cred)->times.endtime;

    ret = _gsskrb5_lifetime_left(minor_status, context,
				 ctx->lifetime, &lifetime_rec);
    if (ret) return ret;

    if (lifetime_rec == 0) {
	*minor_status = 0;
	return GSS_S_CONTEXT_EXPIRED;
    }

    if (time_rec) *time_rec = lifetime_rec;

    return GSS_S_COMPLETE;
}

static OM_uint32
gsskrb5_initiator_ready(
	OM_uint32 * minor_status,
	gsskrb5_ctx ctx,
	krb5_context context)
{
    OM_uint32 ret;
    int32_t seq_number;
    int is_cfx = 0;
    OM_uint32 flags = ctx->flags;

    krb5_free_creds(context, ctx->kcred);
    ctx->kcred = NULL;

    if (ctx->more_flags & CLOSE_CCACHE)
	krb5_cc_close(context, ctx->ccache);
    ctx->ccache = NULL;

    krb5_auth_getremoteseqnumber (context, ctx->auth_context, &seq_number);

    _gsskrb5i_is_cfx(context, ctx, 0);
    is_cfx = (ctx->more_flags & IS_CFX);

    ret = _gssapi_msg_order_create(minor_status,
				   &ctx->order,
				   _gssapi_msg_order_f(flags),
				   seq_number, 0, is_cfx);
    if (ret) return ret;

    ctx->state	= INITIATOR_READY;
    ctx->more_flags	|= OPEN;

    return GSS_S_COMPLETE;
}

/*
 * handle delegated creds in init-sec-context
 */

static void
do_delegation (krb5_context context,
	       krb5_auth_context ac,
	       krb5_ccache ccache,
	       krb5_creds *cred,
	       krb5_const_principal name,
	       krb5_data *fwd_data,
	       uint32_t flagmask,
	       uint32_t *flags)
{
    krb5_creds creds;
    KDCOptions fwd_flags;
    krb5_error_code kret;

    memset (&creds, 0, sizeof(creds));
    krb5_data_zero (fwd_data);

    kret = krb5_cc_get_principal(context, ccache, &creds.client);
    if (kret)
	goto out;

    kret = krb5_build_principal(context,
				&creds.server,
				strlen(creds.client->realm),
				creds.client->realm,
				KRB5_TGS_NAME,
				creds.client->realm,
				NULL);
    if (kret)
	goto out;

    creds.times.endtime = 0;

    memset(&fwd_flags, 0, sizeof(fwd_flags));
    fwd_flags.forwarded = 1;
    fwd_flags.forwardable = 1;

    if ( /*target_name->name.name_type != KRB5_NT_SRV_HST ||*/
	name->name.name_string.len < 2)
	goto out;

    kret = krb5_get_forwarded_creds(context,
				    ac,
				    ccache,
				    KDCOptions2int(fwd_flags),
				    name->name.name_string.val[1],
				    &creds,
				    fwd_data);

 out:
    if (kret)
	*flags &= ~flagmask;
    else
	*flags |= flagmask;

    if (creds.client)
	krb5_free_principal(context, creds.client);
    if (creds.server)
	krb5_free_principal(context, creds.server);
}

/*
 * first stage of init-sec-context
 */

static OM_uint32
init_auth
(OM_uint32 * minor_status,
 gsskrb5_cred cred,
 gsskrb5_ctx ctx,
 krb5_context context,
 gss_name_t name,
 const gss_OID mech_type,
 OM_uint32 req_flags,
 OM_uint32 time_req,
 const gss_buffer_t input_token,
 gss_OID * actual_mech_type,
 gss_buffer_t output_token,
 OM_uint32 * ret_flags,
 OM_uint32 * time_rec
    )
{
    OM_uint32 ret = GSS_S_FAILURE;
    krb5_error_code kret;
    krb5_data outbuf;
    krb5_data fwd_data;
    OM_uint32 lifetime_rec;
    int allow_dns = 1;

    krb5_data_zero(&outbuf);
    krb5_data_zero(&fwd_data);

    *minor_status = 0;

    if (actual_mech_type)
	*actual_mech_type = GSS_KRB5_MECHANISM;

    if (cred == NULL) {
	kret = krb5_cc_default (context, &ctx->ccache);
	if (kret) {
	    *minor_status = kret;
	    ret = GSS_S_FAILURE;
	    goto failure;
	}
	ctx->more_flags |= CLOSE_CCACHE;
    } else
	ctx->ccache = cred->ccache;

    kret = krb5_cc_get_principal (context, ctx->ccache, &ctx->source);
    if (kret) {
	*minor_status = kret;
	ret = GSS_S_FAILURE;
	goto failure;
    }

    ret = _gss_DES3_get_mic_compat(minor_status, ctx, context);
    if (ret)
	goto failure;


    /*
     * This is hideous glue for (NFS) clients that wants to limit the
     * available enctypes to what it can support (encryption in
     * kernel). If there is no enctypes selected for this credential,
     * reset it to the default set of enctypes.
     */
    {
	krb5_enctype *enctypes = NULL;

	if (cred && cred->enctypes)
	    enctypes = cred->enctypes;
	krb5_set_default_in_tkt_etypes(context, enctypes);
    }

    /* canon name if needed for client + target realm */
    kret = krb5_cc_get_config(context, ctx->ccache, NULL,
			      "realm-config", &outbuf);
    if (kret == 0) {
	/* XXX 2 is no server canon */
	if (outbuf.length < 1 || ((((unsigned char *)outbuf.data)[0]) & 2))
	    allow_dns = 0;
	krb5_data_free(&outbuf);
    }

    /*
     * First we try w/o dns, hope that the KDC have register alias
     * (and referrals if cross realm) for this principal. If that
     * fails and if we are allowed to using this realm try again with
     * DNS canonicalizion.
     */
    ret = gsskrb5_get_creds(minor_status, context, ctx->ccache,
			    ctx, name, 0, time_req, 
			    time_rec, &ctx->kcred);
    if (ret && allow_dns)
	ret = gsskrb5_get_creds(minor_status, context, ctx->ccache,
				ctx, name, 1, time_req, 
				time_rec, &ctx->kcred);
    if (ret)
	goto failure;

    ctx->lifetime = ctx->kcred->times.endtime;

    ret = _gsskrb5_lifetime_left(minor_status,
				 context,
				 ctx->lifetime,
				 &lifetime_rec);
    if (ret)
	goto failure;

    if (lifetime_rec == 0) {
	*minor_status = 0;
	ret = GSS_S_CONTEXT_EXPIRED;
	goto failure;
    }

    krb5_auth_con_setkey(context,
			 ctx->auth_context,
			 &ctx->kcred->session);

    kret = krb5_auth_con_generatelocalsubkey(context,
					     ctx->auth_context,
					     &ctx->kcred->session);
    if(kret) {
	*minor_status = kret;
	ret = GSS_S_FAILURE;
	goto failure;
    }

    return GSS_S_COMPLETE;

failure:
    if (ctx->ccache && (ctx->more_flags & CLOSE_CCACHE))
	krb5_cc_close(context, ctx->ccache);
    ctx->ccache = NULL;

    return ret;

}

static OM_uint32
init_auth_restart
(OM_uint32 * minor_status,
 gsskrb5_cred cred,
 gsskrb5_ctx ctx,
 krb5_context context,
 OM_uint32 req_flags,
 const gss_channel_bindings_t input_chan_bindings,
 const gss_buffer_t input_token,
 gss_OID * actual_mech_type,
 gss_buffer_t output_token,
 OM_uint32 * ret_flags,
 OM_uint32 * time_rec
    )
{
    OM_uint32 ret = GSS_S_FAILURE;
    krb5_error_code kret;
    krb5_flags ap_options;
    krb5_data outbuf;
    uint32_t flags;
    krb5_data authenticator;
    Checksum cksum;
    krb5_enctype enctype;
    krb5_data fwd_data, timedata;
    int32_t offset = 0, oldoffset;
    uint32_t flagmask;

    krb5_data_zero(&outbuf);
    krb5_data_zero(&fwd_data);

    *minor_status = 0;

    /*
     * If the credential doesn't have ok-as-delegate, check if there
     * is a realm setting and use that.
     */
    if (!ctx->kcred->flags.b.ok_as_delegate) {
	krb5_data data;
	
	ret = krb5_cc_get_config(context, ctx->ccache, NULL,
				 "realm-config", &data);
	if (ret == 0) {
	    /* XXX 1 is use ok-as-delegate */
	    if (data.length < 1 || ((((unsigned char *)data.data)[0]) & 1) == 0)
		req_flags &= ~(GSS_C_DELEG_FLAG|GSS_C_DELEG_POLICY_FLAG);
	    krb5_data_free(&data);
	}
    }

    flagmask = 0;

    /* if we used GSS_C_DELEG_POLICY_FLAG, trust KDC */
    if ((req_flags & GSS_C_DELEG_POLICY_FLAG)
	&& ctx->kcred->flags.b.ok_as_delegate)
	flagmask |= GSS_C_DELEG_FLAG | GSS_C_DELEG_POLICY_FLAG;
    /* if there still is a GSS_C_DELEG_FLAG, use that */
    if (req_flags & GSS_C_DELEG_FLAG)
	flagmask |= GSS_C_DELEG_FLAG;


    flags = 0;
    ap_options = 0;
    if (flagmask & GSS_C_DELEG_FLAG) {
	do_delegation (context,
		       ctx->auth_context,
		       ctx->ccache, ctx->kcred, ctx->target,
		       &fwd_data, flagmask, &flags);
    }

    if (req_flags & GSS_C_MUTUAL_FLAG) {
	flags |= GSS_C_MUTUAL_FLAG;
	ap_options |= AP_OPTS_MUTUAL_REQUIRED;
    }

    if (req_flags & GSS_C_REPLAY_FLAG)
	flags |= GSS_C_REPLAY_FLAG;
    if (req_flags & GSS_C_SEQUENCE_FLAG)
	flags |= GSS_C_SEQUENCE_FLAG;
#if 0
    if (req_flags & GSS_C_ANON_FLAG)
	;                               /* XXX */
#endif
    if (req_flags & GSS_C_DCE_STYLE) {
	/* GSS_C_DCE_STYLE implies GSS_C_MUTUAL_FLAG */
	flags |= GSS_C_DCE_STYLE | GSS_C_MUTUAL_FLAG;
	ap_options |= AP_OPTS_MUTUAL_REQUIRED;
    }
    if (req_flags & GSS_C_IDENTIFY_FLAG)
	flags |= GSS_C_IDENTIFY_FLAG;
    if (req_flags & GSS_C_EXTENDED_ERROR_FLAG)
	flags |= GSS_C_EXTENDED_ERROR_FLAG;

    if (req_flags & GSS_C_CONF_FLAG) {
	flags |= GSS_C_CONF_FLAG;
    }
    if (req_flags & GSS_C_INTEG_FLAG) {
	flags |= GSS_C_INTEG_FLAG;
    }
    if (cred == NULL || !(cred->cred_flags & GSS_CF_NO_CI_FLAGS)) {
	flags |= GSS_C_CONF_FLAG;
	flags |= GSS_C_INTEG_FLAG;
    }
    flags |= GSS_C_TRANS_FLAG;

    if (ret_flags)
	*ret_flags = flags;
    ctx->flags = flags;
    ctx->more_flags |= LOCAL;

    ret = _gsskrb5_create_8003_checksum (minor_status,
					 input_chan_bindings,
					 flags,
					 &fwd_data,
					 &cksum);
    krb5_data_free (&fwd_data);
    if (ret)
	goto failure;

    enctype = ctx->auth_context->keyblock->keytype;

    ret = krb5_cc_get_config(context, ctx->ccache, ctx->target,
			     "time-offset", &timedata);
    if (ret == 0) {
	if (timedata.length == 4) {
	    const u_char *p = timedata.data;
	    offset = (p[0] <<24) | (p[1] << 16) | (p[2] << 8) | (p[3] << 0);
	}
	krb5_data_free(&timedata);
    }

    if (offset) {
	krb5_get_kdc_sec_offset (context, &oldoffset, NULL);
	krb5_set_kdc_sec_offset (context, offset, -1);
    }

    kret = krb5_build_authenticator (context,
				     ctx->auth_context,
				     enctype,
				     ctx->kcred,
				     &cksum,
				     NULL,
				     &authenticator,
				     KRB5_KU_AP_REQ_AUTH);

    if (kret) {
	if (offset)
	    krb5_set_kdc_sec_offset (context, oldoffset, -1);
	*minor_status = kret;
	ret = GSS_S_FAILURE;
	goto failure;
    }

    kret = krb5_build_ap_req (context,
			      enctype,
			      ctx->kcred,
			      ap_options,
			      authenticator,
			      &outbuf);
    if (offset)
	krb5_set_kdc_sec_offset (context, oldoffset, -1);
    if (kret) {
	*minor_status = kret;
	ret = GSS_S_FAILURE;
	goto failure;
    }

    if (flags & GSS_C_DCE_STYLE) {
	output_token->value = outbuf.data;
	output_token->length = outbuf.length;
    } else {
        ret = _gsskrb5_encapsulate (minor_status, &outbuf, output_token,
				    (u_char *)"\x01\x00", GSS_KRB5_MECHANISM);
	krb5_data_free (&outbuf);
	if (ret)
	    goto failure;
    }

    free_Checksum(&cksum);

    if (flags & GSS_C_MUTUAL_FLAG) {
	ctx->state = INITIATOR_WAIT_FOR_MUTAL;
	return GSS_S_CONTINUE_NEEDED;
    }

    return gsskrb5_initiator_ready(minor_status, ctx, context);
failure:
    if (ctx->ccache && (ctx->more_flags & CLOSE_CCACHE))
	krb5_cc_close(context, ctx->ccache);
    ctx->ccache = NULL;

    return ret;
}


static OM_uint32
repl_mutual
(OM_uint32 * minor_status,
 gsskrb5_ctx ctx,
 krb5_context context,
 const gss_OID mech_type,
 OM_uint32 req_flags,
 OM_uint32 time_req,
 const gss_channel_bindings_t input_chan_bindings,
 const gss_buffer_t input_token,
 gss_OID * actual_mech_type,
 gss_buffer_t output_token,
 OM_uint32 * ret_flags,
 OM_uint32 * time_rec
    )
{
    OM_uint32 ret;
    krb5_error_code kret;
    krb5_data indata;
    krb5_ap_rep_enc_part *repl;

    output_token->length = 0;
    output_token->value = NULL;

    if (actual_mech_type)
	*actual_mech_type = GSS_KRB5_MECHANISM;

    if (IS_DCE_STYLE(ctx)) {
	/* There is no OID wrapping. */
	indata.length	= input_token->length;
	indata.data	= input_token->value;
    } else {
	ret = _gsskrb5_decapsulate (minor_status,
				    input_token,
				    &indata,
				    "\x02\x00",
				    GSS_KRB5_MECHANISM);
	if (ret == GSS_S_DEFECTIVE_TOKEN) {
	    /* check if there is an error token sent instead */
	    ret = _gsskrb5_decapsulate (minor_status,
					input_token,
					&indata,
					"\x03\x00",
					GSS_KRB5_MECHANISM);
	    if (ret == GSS_S_COMPLETE) {
		KRB_ERROR error;
		
		kret = krb5_rd_error(context, &indata, &error);
		if (kret == 0) {
		    kret = krb5_error_from_rd_error(context, &error, NULL);

		    /* save the time skrew for this host */
		    if (kret == KRB5KRB_AP_ERR_SKEW) {
			krb5_data timedata;
			unsigned char p[4];
			int32_t t = error.stime - time(NULL);

			p[0] = (t >> 24) & 0xFF;
			p[1] = (t >> 16) & 0xFF;
			p[2] = (t >> 8)  & 0xFF;
			p[3] = (t >> 0)  & 0xFF;

			timedata.data = p;
			timedata.length = sizeof(p);

			krb5_cc_set_config(context, ctx->ccache, ctx->target,
					   "time-offset", &timedata);

			if ((ctx->more_flags & RETRIED) == 0)
			    ctx->state = INITIATOR_RESTART;
			ctx->more_flags |= RETRIED;
		    }
		    free_KRB_ERROR (&error);
		}
		*minor_status = kret;
		return GSS_S_FAILURE;
	    }
	    return ret;
	}
    }

    kret = krb5_rd_rep (context,
			ctx->auth_context,
			&indata,
			&repl);
    if (kret) {
	*minor_status = kret;
	return GSS_S_FAILURE;
    }
    krb5_free_ap_rep_enc_part (context,
			       repl);

    *minor_status = 0;
    if (time_rec) {
	ret = _gsskrb5_lifetime_left(minor_status,
				     context,
				     ctx->lifetime,
				     time_rec);
    } else {
	ret = GSS_S_COMPLETE;
    }
    if (ret_flags)
	*ret_flags = ctx->flags;

    if (req_flags & GSS_C_DCE_STYLE) {
	int32_t local_seq, remote_seq;
	krb5_data outbuf;

	/*
	 * So DCE_STYLE is strange. The client echos the seq number
	 * that the server used in the server's mk_rep in its own
	 * mk_rep(). After when done, it resets to it's own seq number
	 * for the gss_wrap calls.
	 */

	krb5_auth_getremoteseqnumber(context, ctx->auth_context, &remote_seq);
	krb5_auth_con_getlocalseqnumber(context, ctx->auth_context, &local_seq);
	krb5_auth_con_setlocalseqnumber(context, ctx->auth_context, remote_seq);

	kret = krb5_mk_rep(context, ctx->auth_context, &outbuf);
	if (kret) {
	    *minor_status = kret;
	    return GSS_S_FAILURE;
	}
	
	/* reset local seq number */
	krb5_auth_con_setlocalseqnumber(context, ctx->auth_context, local_seq);	

	output_token->length = outbuf.length;
	output_token->value  = outbuf.data;
    }

    return gsskrb5_initiator_ready(minor_status, ctx, context);
}

/*
 * gss_init_sec_context
 */

OM_uint32 _gsskrb5_init_sec_context
(OM_uint32 * minor_status,
 const gss_cred_id_t cred_handle,
 gss_ctx_id_t * context_handle,
 const gss_name_t target_name,
 const gss_OID mech_type,
 OM_uint32 req_flags,
 OM_uint32 time_req,
 const gss_channel_bindings_t input_chan_bindings,
 const gss_buffer_t input_token,
 gss_OID * actual_mech_type,
 gss_buffer_t output_token,
 OM_uint32 * ret_flags,
 OM_uint32 * time_rec
    )
{
    krb5_context context;
    gsskrb5_cred cred = (gsskrb5_cred)cred_handle;
    gsskrb5_ctx ctx;
    OM_uint32 ret;

    GSSAPI_KRB5_INIT (&context);

    output_token->length = 0;
    output_token->value  = NULL;

    if (context_handle == NULL) {
	*minor_status = 0;
	return GSS_S_FAILURE | GSS_S_CALL_BAD_STRUCTURE;
    }

    if (ret_flags)
	*ret_flags = 0;
    if (time_rec)
	*time_rec = 0;

    if (target_name == GSS_C_NO_NAME) {
	if (actual_mech_type)
	    *actual_mech_type = GSS_C_NO_OID;
	*minor_status = 0;
	return GSS_S_BAD_NAME;
    }

    if (mech_type != GSS_C_NO_OID &&
	!gss_oid_equal(mech_type, GSS_KRB5_MECHANISM))
	return GSS_S_BAD_MECH;

    if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
	OM_uint32 ret;

	if (*context_handle != GSS_C_NO_CONTEXT) {
	    *minor_status = 0;
	    return GSS_S_FAILURE | GSS_S_CALL_BAD_STRUCTURE;
	}

	ret = _gsskrb5_create_ctx(minor_status,
				  context_handle,
				  context,
				  input_chan_bindings,
				  INITIATOR_START);
	if (ret)
	    return ret;
    }

    if (*context_handle == GSS_C_NO_CONTEXT) {
	*minor_status = 0;
	return GSS_S_FAILURE | GSS_S_CALL_BAD_STRUCTURE;
    }

    ctx = (gsskrb5_ctx) *context_handle;

    HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);

 again:
    switch (ctx->state) {
    case INITIATOR_START:
	ret = init_auth(minor_status,
			cred,
			ctx,
			context,
			target_name,
			mech_type,
			req_flags,
			time_req,
			input_token,
			actual_mech_type,
			output_token,
			ret_flags,
			time_rec);
	if (ret != GSS_S_COMPLETE)
	    break;	
	/* FALL THOUGH */
    case INITIATOR_RESTART:
	ret = init_auth_restart(minor_status,
				cred,
				ctx,
				context,
				req_flags,
				input_chan_bindings,
				input_token,
				actual_mech_type,
				output_token,
				ret_flags,
				time_rec);
	break;
    case INITIATOR_WAIT_FOR_MUTAL:
	ret = repl_mutual(minor_status,
			  ctx,
			  context,
			  mech_type,
			  req_flags,
			  time_req,
			  input_chan_bindings,
			  input_token,
			  actual_mech_type,
			  output_token,
			  ret_flags,
			  time_rec);
	if (ctx->state == INITIATOR_RESTART)
	    goto again;
	break;
    case INITIATOR_READY:
	/*
	 * If we get there, the caller have called
	 * gss_init_sec_context() one time too many.
	 */
	_gsskrb5_set_status(EINVAL, "init_sec_context "
			    "called one time too many");
	*minor_status = EINVAL;
	ret = GSS_S_BAD_STATUS;
	break;
    default:
	_gsskrb5_set_status(EINVAL, "init_sec_context "
			    "invalid state %d for client",
			    (int)ctx->state);
	*minor_status = EINVAL;
	ret = GSS_S_BAD_STATUS;
	break;
    }
    HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);

    /* destroy context in case of error */
    if (GSS_ERROR(ret)) {
	OM_uint32 min2;
	_gsskrb5_delete_sec_context(&min2, context_handle, GSS_C_NO_BUFFER);
    }

    return ret;

}