summaryrefslogtreecommitdiff
path: root/source4/heimdal/lib/gssapi/mech/gss_krb5.c
blob: fe88a384b5f1022e0239bd6bedbc9eabbadda189 (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
/*-
 * Copyright (c) 2005 Doug Rabson
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 *
 *	$FreeBSD: src/lib/libgssapi/gss_krb5.c,v 1.1 2005/12/29 14:40:20 dfr Exp $
 */

#include "mech_locl.h"

#include <krb5.h>
#include <roken.h>


GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_krb5_copy_ccache(OM_uint32 *minor_status,
		     gss_cred_id_t cred,
		     krb5_ccache out)
{
    gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
    krb5_context context;
    krb5_error_code kret;
    krb5_ccache id;
    OM_uint32 ret;
    char *str = NULL;

    ret = gss_inquire_cred_by_oid(minor_status,
				  cred,
				  GSS_KRB5_COPY_CCACHE_X,
				  &data_set);
    if (ret)
	return ret;

    if (data_set == GSS_C_NO_BUFFER_SET || data_set->count < 1) {
	gss_release_buffer_set(minor_status, &data_set);
	*minor_status = EINVAL;
	return GSS_S_FAILURE;
    }

    kret = krb5_init_context(&context);
    if (kret) {
	*minor_status = kret;
	gss_release_buffer_set(minor_status, &data_set);
	return GSS_S_FAILURE;
    }

    kret = asprintf(&str, "%.*s", (int)data_set->elements[0].length,
		    (char *)data_set->elements[0].value);
    gss_release_buffer_set(minor_status, &data_set);
    if (kret < 0 || str == NULL) {
	*minor_status = ENOMEM;
	return GSS_S_FAILURE;
    }

    kret = krb5_cc_resolve(context, str, &id);
    free(str);
    if (kret) {
	*minor_status = kret;
	return GSS_S_FAILURE;
    }

    kret = krb5_cc_copy_cache(context, id, out);
    krb5_cc_close(context, id);
    krb5_free_context(context);
    if (kret) {
	*minor_status = kret;
	return GSS_S_FAILURE;
    }

    return ret;
}

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_krb5_import_cred(OM_uint32 *minor_status,
		     krb5_ccache id,
		     krb5_principal keytab_principal,
		     krb5_keytab keytab,
		     gss_cred_id_t *cred)
{
    gss_buffer_desc buffer;
    OM_uint32 major_status;
    krb5_context context;
    krb5_error_code ret;
    krb5_storage *sp;
    krb5_data data;
    char *str;

    *cred = GSS_C_NO_CREDENTIAL;

    ret = krb5_init_context(&context);
    if (ret) {
	*minor_status = ret;
	return GSS_S_FAILURE;
    }

    sp = krb5_storage_emem();
    if (sp == NULL) {
	*minor_status = ENOMEM;
	major_status = GSS_S_FAILURE;
	goto out;
    }

    if (id) {
	ret = krb5_cc_get_full_name(context, id, &str);
	if (ret == 0) {
	    ret = krb5_store_string(sp, str);
	    free(str);
	}
    } else
	ret = krb5_store_string(sp, "");
    if (ret) {
	*minor_status = ret;
	major_status = GSS_S_FAILURE;
	goto out;
    }

    if (keytab_principal) {
	ret = krb5_unparse_name(context, keytab_principal, &str);
	if (ret == 0) {
	    ret = krb5_store_string(sp, str);
	    free(str);
	}
    } else
	krb5_store_string(sp, "");
    if (ret) {
	*minor_status = ret;
	major_status = GSS_S_FAILURE;
	goto out;
    }


    if (keytab) {
	ret = krb5_kt_get_full_name(context, keytab, &str);
	if (ret == 0) {
	    ret = krb5_store_string(sp, str);
	    free(str);
	}
    } else
	krb5_store_string(sp, "");
    if (ret) {
	*minor_status = ret;
	major_status = GSS_S_FAILURE;
	goto out;
    }

    ret = krb5_storage_to_data(sp, &data);
    if (ret) {
	*minor_status = ret;
	major_status = GSS_S_FAILURE;
	goto out;
    }

    buffer.value = data.data;
    buffer.length = data.length;

    major_status = gss_set_cred_option(minor_status,
				       cred,
				       GSS_KRB5_IMPORT_CRED_X,
				       &buffer);
    krb5_data_free(&data);
out:
    if (sp)
	krb5_storage_free(sp);
    krb5_free_context(context);
    return major_status;
}

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gsskrb5_register_acceptor_identity(const char *identity)
{
	gssapi_mech_interface m;
	gss_buffer_desc buffer;
	OM_uint32 junk;

	_gss_load_mech();

	buffer.value = rk_UNCONST(identity);
	buffer.length = strlen(identity);

	m = __gss_get_mechanism(GSS_KRB5_MECHANISM);
	if (m == NULL || m->gm_set_sec_context_option == NULL)
	    return GSS_S_FAILURE;

	return m->gm_set_sec_context_option(&junk, NULL,
	        GSS_KRB5_REGISTER_ACCEPTOR_IDENTITY_X, &buffer);
}

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
krb5_gss_register_acceptor_identity(const char *identity)
{
    return gsskrb5_register_acceptor_identity(identity);
}


GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gsskrb5_set_dns_canonicalize(int flag)
{
        struct _gss_mech_switch	*m;
	gss_buffer_desc buffer;
	OM_uint32 junk;
	char b = (flag != 0);

	_gss_load_mech();

	buffer.value = &b;
	buffer.length = sizeof(b);

	HEIM_SLIST_FOREACH(m, &_gss_mechs, gm_link) {
		if (m->gm_mech.gm_set_sec_context_option == NULL)
			continue;
		m->gm_mech.gm_set_sec_context_option(&junk, NULL,
		    GSS_KRB5_SET_DNS_CANONICALIZE_X, &buffer);
	}

	return (GSS_S_COMPLETE);
}



static krb5_error_code
set_key(krb5_keyblock *keyblock, gss_krb5_lucid_key_t *key)
{
    key->type = keyblock->keytype;
    key->length = keyblock->keyvalue.length;
    key->data = malloc(key->length);
    if (key->data == NULL && key->length != 0)
	return ENOMEM;
    memcpy(key->data, keyblock->keyvalue.data, key->length);
    return 0;
}

static void
free_key(gss_krb5_lucid_key_t *key)
{
    memset(key->data, 0, key->length);
    free(key->data);
    memset(key, 0, sizeof(*key));
}

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_krb5_export_lucid_sec_context(OM_uint32 *minor_status,
				  gss_ctx_id_t *context_handle,
				  OM_uint32 version,
				  void **rctx)
{
    krb5_context context = NULL;
    krb5_error_code ret;
    gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
    OM_uint32 major_status;
    gss_krb5_lucid_context_v1_t *ctx = NULL;
    krb5_storage *sp = NULL;
    uint32_t num;

    if (context_handle == NULL
	|| *context_handle == GSS_C_NO_CONTEXT
	|| version != 1)
    {
	*minor_status = EINVAL;
	return GSS_S_FAILURE;
    }

    major_status =
	gss_inquire_sec_context_by_oid (minor_status,
					*context_handle,
					GSS_KRB5_EXPORT_LUCID_CONTEXT_V1_X,
					&data_set);
    if (major_status)
	return major_status;

    if (data_set == GSS_C_NO_BUFFER_SET || data_set->count != 1) {
	gss_release_buffer_set(minor_status, &data_set);
	*minor_status = EINVAL;
	return GSS_S_FAILURE;
    }

    ret = krb5_init_context(&context);
    if (ret)
	goto out;

    ctx = calloc(1, sizeof(*ctx));
    if (ctx == NULL) {
	ret = ENOMEM;
	goto out;
    }

    sp = krb5_storage_from_mem(data_set->elements[0].value,
			       data_set->elements[0].length);
    if (sp == NULL) {
	ret = ENOMEM;
	goto out;
    }

    ret = krb5_ret_uint32(sp, &num);
    if (ret) goto out;
    if (num != 1) {
	ret = EINVAL;
	goto out;
    }
    ctx->version = 1;
    /* initiator */
    ret = krb5_ret_uint32(sp, &ctx->initiate);
    if (ret) goto out;
    /* endtime */
    ret = krb5_ret_uint32(sp, &ctx->endtime);
    if (ret) goto out;
    /* send_seq */
    ret = krb5_ret_uint32(sp, &num);
    if (ret) goto out;
    ctx->send_seq = ((uint64_t)num) << 32;
    ret = krb5_ret_uint32(sp, &num);
    if (ret) goto out;
    ctx->send_seq |= num;
    /* recv_seq */
    ret = krb5_ret_uint32(sp, &num);
    if (ret) goto out;
    ctx->recv_seq = ((uint64_t)num) << 32;
    ret = krb5_ret_uint32(sp, &num);
    if (ret) goto out;
    ctx->recv_seq |= num;
    /* protocol */
    ret = krb5_ret_uint32(sp, &ctx->protocol);
    if (ret) goto out;
    if (ctx->protocol == 0) {
	krb5_keyblock key;

	/* sign_alg */
	ret = krb5_ret_uint32(sp, &ctx->rfc1964_kd.sign_alg);
	if (ret) goto out;
	/* seal_alg */
	ret = krb5_ret_uint32(sp, &ctx->rfc1964_kd.seal_alg);
	if (ret) goto out;
	/* ctx_key */
	ret = krb5_ret_keyblock(sp, &key);
	if (ret) goto out;
	ret = set_key(&key, &ctx->rfc1964_kd.ctx_key);
	krb5_free_keyblock_contents(context, &key);
	if (ret) goto out;
    } else if (ctx->protocol == 1) {
	krb5_keyblock key;

	/* acceptor_subkey */
	ret = krb5_ret_uint32(sp, &ctx->cfx_kd.have_acceptor_subkey);
	if (ret) goto out;
	/* ctx_key */
	ret = krb5_ret_keyblock(sp, &key);
	if (ret) goto out;
	ret = set_key(&key, &ctx->cfx_kd.ctx_key);
	krb5_free_keyblock_contents(context, &key);
	if (ret) goto out;
	/* acceptor_subkey */
	if (ctx->cfx_kd.have_acceptor_subkey) {
	    ret = krb5_ret_keyblock(sp, &key);
	    if (ret) goto out;
	    ret = set_key(&key, &ctx->cfx_kd.acceptor_subkey);
	    krb5_free_keyblock_contents(context, &key);
	    if (ret) goto out;
	}
    } else {
	ret = EINVAL;
	goto out;
    }

    *rctx = ctx;

out:
    gss_release_buffer_set(minor_status, &data_set);
    if (sp)
	krb5_storage_free(sp);
    if (context)
	krb5_free_context(context);

    if (ret) {
	if (ctx)
	    gss_krb5_free_lucid_sec_context(NULL, ctx);

	*minor_status = ret;
	return GSS_S_FAILURE;
    }
    *minor_status = 0;
    return GSS_S_COMPLETE;
}

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_krb5_free_lucid_sec_context(OM_uint32 *minor_status, void *c)
{
    gss_krb5_lucid_context_v1_t *ctx = c;

    if (ctx->version != 1) {
	if (minor_status)
	    *minor_status = 0;
	return GSS_S_FAILURE;
    }

    if (ctx->protocol == 0) {
	free_key(&ctx->rfc1964_kd.ctx_key);
    } else if (ctx->protocol == 1) {
	free_key(&ctx->cfx_kd.ctx_key);
	if (ctx->cfx_kd.have_acceptor_subkey)
	    free_key(&ctx->cfx_kd.acceptor_subkey);
    }
    free(ctx);
    if (minor_status)
	*minor_status = 0;
    return GSS_S_COMPLETE;
}

/*
 *
 */

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_krb5_set_allowable_enctypes(OM_uint32 *minor_status,
				gss_cred_id_t cred,
				OM_uint32 num_enctypes,
				int32_t *enctypes)
{
    krb5_error_code ret;
    OM_uint32 maj_status;
    gss_buffer_desc buffer;
    krb5_storage *sp;
    krb5_data data;
    size_t i;

    sp = krb5_storage_emem();
    if (sp == NULL) {
	*minor_status = ENOMEM;
	maj_status = GSS_S_FAILURE;
	goto out;
    }

    for (i = 0; i < num_enctypes; i++) {
	ret = krb5_store_int32(sp, enctypes[i]);
	if (ret) {
	    *minor_status = ret;
	    maj_status = GSS_S_FAILURE;
	    goto out;
	}
    }

    ret = krb5_storage_to_data(sp, &data);
    if (ret) {
	*minor_status = ret;
	maj_status = GSS_S_FAILURE;
	goto out;
    }

    buffer.value = data.data;
    buffer.length = data.length;

    maj_status = gss_set_cred_option(minor_status,
				     &cred,
				     GSS_KRB5_SET_ALLOWABLE_ENCTYPES_X,
				     &buffer);
    krb5_data_free(&data);
out:
    if (sp)
	krb5_storage_free(sp);
    return maj_status;
}

/*
 *
 */

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gsskrb5_set_send_to_kdc(struct gsskrb5_send_to_kdc *c)
{
    struct _gss_mech_switch *m;
    gss_buffer_desc buffer;
    OM_uint32 junk;

    _gss_load_mech();

    if (c) {
	buffer.value = c;
	buffer.length = sizeof(*c);
    } else {
	buffer.value = NULL;
	buffer.length = 0;
    }

    HEIM_SLIST_FOREACH(m, &_gss_mechs, gm_link) {
	if (m->gm_mech.gm_set_sec_context_option == NULL)
	    continue;
	m->gm_mech.gm_set_sec_context_option(&junk, NULL,
	    GSS_KRB5_SEND_TO_KDC_X, &buffer);
    }

    return (GSS_S_COMPLETE);
}

/*
 *
 */

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_krb5_ccache_name(OM_uint32 *minor_status,
		     const char *name,
		     const char **out_name)
{
    struct _gss_mech_switch *m;
    gss_buffer_desc buffer;
    OM_uint32 junk;

    _gss_load_mech();

    if (out_name)
	*out_name = NULL;

    buffer.value = rk_UNCONST(name);
    buffer.length = strlen(name);

    HEIM_SLIST_FOREACH(m, &_gss_mechs, gm_link) {
	if (m->gm_mech.gm_set_sec_context_option == NULL)
	    continue;
	m->gm_mech.gm_set_sec_context_option(&junk, NULL,
	    GSS_KRB5_CCACHE_NAME_X, &buffer);
    }

    return (GSS_S_COMPLETE);
}


/*
 *
 */

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gsskrb5_extract_authtime_from_sec_context(OM_uint32 *minor_status,
					  gss_ctx_id_t context_handle,
					  time_t *authtime)
{
    gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
    OM_uint32 maj_stat;

    if (context_handle == GSS_C_NO_CONTEXT) {
	*minor_status = EINVAL;
	return GSS_S_FAILURE;
    }

    maj_stat =
	gss_inquire_sec_context_by_oid (minor_status,
					context_handle,
					GSS_KRB5_GET_AUTHTIME_X,
					&data_set);
    if (maj_stat)
	return maj_stat;

    if (data_set == GSS_C_NO_BUFFER_SET) {
	gss_release_buffer_set(minor_status, &data_set);
	*minor_status = EINVAL;
	return GSS_S_FAILURE;
    }

    if (data_set->count != 1) {
	gss_release_buffer_set(minor_status, &data_set);
	*minor_status = EINVAL;
	return GSS_S_FAILURE;
    }

    if (data_set->elements[0].length != 4) {
	gss_release_buffer_set(minor_status, &data_set);
	*minor_status = EINVAL;
	return GSS_S_FAILURE;
    }

    {
	unsigned char *buf = data_set->elements[0].value;
	*authtime = (buf[3] <<24) | (buf[2] << 16) |
	    (buf[1] << 8) | (buf[0] << 0);
    }

    gss_release_buffer_set(minor_status, &data_set);

    *minor_status = 0;
    return GSS_S_COMPLETE;
}

/*
 *
 */

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gsskrb5_extract_authz_data_from_sec_context(OM_uint32 *minor_status,
					    gss_ctx_id_t context_handle,
					    int ad_type,
					    gss_buffer_t ad_data)
{
    gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
    OM_uint32 maj_stat;
    gss_OID_desc oid_flat;
    heim_oid baseoid, oid;
    size_t size;

    if (context_handle == GSS_C_NO_CONTEXT) {
	*minor_status = EINVAL;
	return GSS_S_FAILURE;
    }

    /* All this to append an integer to an oid... */

    if (der_get_oid(GSS_KRB5_EXTRACT_AUTHZ_DATA_FROM_SEC_CONTEXT_X->elements,
		    GSS_KRB5_EXTRACT_AUTHZ_DATA_FROM_SEC_CONTEXT_X->length,
		    &baseoid, NULL) != 0) {
	*minor_status = EINVAL;
	return GSS_S_FAILURE;
    }

    oid.length = baseoid.length + 1;
    oid.components = calloc(oid.length, sizeof(*oid.components));
    if (oid.components == NULL) {
	der_free_oid(&baseoid);

	*minor_status = ENOMEM;
	return GSS_S_FAILURE;
    }

    memcpy(oid.components, baseoid.components,
	   baseoid.length * sizeof(*baseoid.components));

    der_free_oid(&baseoid);

    oid.components[oid.length - 1] = ad_type;

    oid_flat.length = der_length_oid(&oid);
    oid_flat.elements = malloc(oid_flat.length);
    if (oid_flat.elements == NULL) {
	free(oid.components);
	*minor_status = ENOMEM;
	return GSS_S_FAILURE;
    }

    if (der_put_oid((unsigned char *)oid_flat.elements + oid_flat.length - 1,
		    oid_flat.length, &oid, &size) != 0) {
	free(oid.components);
	free(oid_flat.elements);
	*minor_status = EINVAL;
	return GSS_S_FAILURE;
    }
    if (oid_flat.length != size)
	abort();

    free(oid.components);

    /* FINALLY, we have the OID */

    maj_stat = gss_inquire_sec_context_by_oid (minor_status,
					       context_handle,
					       &oid_flat,
					       &data_set);

    free(oid_flat.elements);

    if (maj_stat)
	return maj_stat;

    if (data_set == GSS_C_NO_BUFFER_SET || data_set->count != 1) {
	gss_release_buffer_set(minor_status, &data_set);
	*minor_status = EINVAL;
	return GSS_S_FAILURE;
    }

    ad_data->value = malloc(data_set->elements[0].length);
    if (ad_data->value == NULL) {
	gss_release_buffer_set(minor_status, &data_set);
	*minor_status = ENOMEM;
	return GSS_S_FAILURE;
    }

    ad_data->length = data_set->elements[0].length;
    memcpy(ad_data->value, data_set->elements[0].value, ad_data->length);
    gss_release_buffer_set(minor_status, &data_set);

    *minor_status = 0;
    return GSS_S_COMPLETE;
}

/*
 *
 */

static OM_uint32
gsskrb5_extract_key(OM_uint32 *minor_status,
		    gss_ctx_id_t context_handle,
		    const gss_OID oid,
		    krb5_keyblock **keyblock)
{
    krb5_error_code ret;
    gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
    OM_uint32 major_status;
    krb5_context context = NULL;
    krb5_storage *sp = NULL;

    if (context_handle == GSS_C_NO_CONTEXT) {
	*minor_status = EINVAL;
	return GSS_S_FAILURE;
    }

    ret = krb5_init_context(&context);
    if(ret) {
	*minor_status = ret;
	return GSS_S_FAILURE;
    }

    major_status =
	gss_inquire_sec_context_by_oid (minor_status,
					context_handle,
					oid,
					&data_set);
    if (major_status)
	return major_status;

    if (data_set == GSS_C_NO_BUFFER_SET || data_set->count != 1) {
	gss_release_buffer_set(minor_status, &data_set);
	*minor_status = EINVAL;
	return GSS_S_FAILURE;
    }

    sp = krb5_storage_from_mem(data_set->elements[0].value,
			       data_set->elements[0].length);
    if (sp == NULL) {
	ret = ENOMEM;
	goto out;
    }

    *keyblock = calloc(1, sizeof(**keyblock));
    if (keyblock == NULL) {
	ret = ENOMEM;
	goto out;
    }

    ret = krb5_ret_keyblock(sp, *keyblock);

out:
    gss_release_buffer_set(minor_status, &data_set);
    if (sp)
	krb5_storage_free(sp);
    if (ret && keyblock) {
	krb5_free_keyblock(context, *keyblock);
	*keyblock = NULL;
    }
    if (context)
	krb5_free_context(context);

    *minor_status = ret;
    if (ret)
	return GSS_S_FAILURE;

    return GSS_S_COMPLETE;
}

/*
 *
 */

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gsskrb5_extract_service_keyblock(OM_uint32 *minor_status,
				 gss_ctx_id_t context_handle,
				 krb5_keyblock **keyblock)
{
    return gsskrb5_extract_key(minor_status,
			       context_handle,
			       GSS_KRB5_GET_SERVICE_KEYBLOCK_X,
			       keyblock);
}

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gsskrb5_get_initiator_subkey(OM_uint32 *minor_status,
			     gss_ctx_id_t context_handle,
			     krb5_keyblock **keyblock)
{
    return gsskrb5_extract_key(minor_status,
			       context_handle,
			       GSS_KRB5_GET_INITIATOR_SUBKEY_X,
			       keyblock);
}

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gsskrb5_get_subkey(OM_uint32 *minor_status,
		   gss_ctx_id_t context_handle,
		   krb5_keyblock **keyblock)
{
    return gsskrb5_extract_key(minor_status,
			       context_handle,
			       GSS_KRB5_GET_SUBKEY_X,
			       keyblock);
}

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gsskrb5_set_default_realm(const char *realm)
{
        struct _gss_mech_switch	*m;
	gss_buffer_desc buffer;
	OM_uint32 junk;

	_gss_load_mech();

	buffer.value = rk_UNCONST(realm);
	buffer.length = strlen(realm);

	HEIM_SLIST_FOREACH(m, &_gss_mechs, gm_link) {
		if (m->gm_mech.gm_set_sec_context_option == NULL)
			continue;
		m->gm_mech.gm_set_sec_context_option(&junk, NULL,
		    GSS_KRB5_SET_DEFAULT_REALM_X, &buffer);
	}

	return (GSS_S_COMPLETE);
}

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_krb5_get_tkt_flags(OM_uint32 *minor_status,
		       gss_ctx_id_t context_handle,
		       OM_uint32 *tkt_flags)
{

    OM_uint32 major_status;
    gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;

    if (context_handle == GSS_C_NO_CONTEXT) {
	*minor_status = EINVAL;
	return GSS_S_FAILURE;
    }

    major_status =
	gss_inquire_sec_context_by_oid (minor_status,
					context_handle,
					GSS_KRB5_GET_TKT_FLAGS_X,
					&data_set);
    if (major_status)
	return major_status;

    if (data_set == GSS_C_NO_BUFFER_SET ||
	data_set->count != 1 ||
	data_set->elements[0].length < 4) {
	gss_release_buffer_set(minor_status, &data_set);
	*minor_status = EINVAL;
	return GSS_S_FAILURE;
    }

    {
	const u_char *p = data_set->elements[0].value;
	*tkt_flags = (p[0] << 0) | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
    }

    gss_release_buffer_set(minor_status, &data_set);
    return GSS_S_COMPLETE;
}

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gsskrb5_set_time_offset(int offset)
{
        struct _gss_mech_switch	*m;
	gss_buffer_desc buffer;
	OM_uint32 junk;
	int32_t o = offset;

	_gss_load_mech();

	buffer.value = &o;
	buffer.length = sizeof(o);

	HEIM_SLIST_FOREACH(m, &_gss_mechs, gm_link) {
		if (m->gm_mech.gm_set_sec_context_option == NULL)
			continue;
		m->gm_mech.gm_set_sec_context_option(&junk, NULL,
		    GSS_KRB5_SET_TIME_OFFSET_X, &buffer);
	}

	return (GSS_S_COMPLETE);
}

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gsskrb5_get_time_offset(int *offset)
{
        struct _gss_mech_switch	*m;
	gss_buffer_desc buffer;
	OM_uint32 maj_stat, junk;
	int32_t o;

	_gss_load_mech();

	buffer.value = &o;
	buffer.length = sizeof(o);

	HEIM_SLIST_FOREACH(m, &_gss_mechs, gm_link) {
		if (m->gm_mech.gm_set_sec_context_option == NULL)
			continue;
		maj_stat = m->gm_mech.gm_set_sec_context_option(&junk, NULL,
		    GSS_KRB5_GET_TIME_OFFSET_X, &buffer);

		if (maj_stat == GSS_S_COMPLETE) {
			*offset = o;
			return maj_stat;
		}
	}

	return (GSS_S_UNAVAILABLE);
}

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gsskrb5_plugin_register(struct gsskrb5_krb5_plugin *c)
{
    struct _gss_mech_switch *m;
    gss_buffer_desc buffer;
    OM_uint32 junk;

    _gss_load_mech();

    buffer.value = c;
    buffer.length = sizeof(*c);

    HEIM_SLIST_FOREACH(m, &_gss_mechs, gm_link) {
	if (m->gm_mech.gm_set_sec_context_option == NULL)
	    continue;
	m->gm_mech.gm_set_sec_context_option(&junk, NULL,
	    GSS_KRB5_PLUGIN_REGISTER_X, &buffer);
    }

    return (GSS_S_COMPLETE);
}