summaryrefslogtreecommitdiff
path: root/os/k5auth.c
blob: ffe7b5ad14cac4a6ca1dae998dd193ae4a9c3cdc (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
/* $Xorg: k5auth.c,v 1.4 2001/02/09 02:05:23 xorgcvs Exp $ */
/*

Copyright 1993, 1994, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall
not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization
from The Open Group.

*/
/* $XFree86$ */

/*
 * Kerberos V5 authentication scheme
 * Author: Tom Yu <tlyu@MIT.EDU>
 *
 * Mostly snarfed wholesale from the user_user demo in the
 * krb5 distribution. (At least the checking part)
 */

#include <sys/types.h>
#include <sys/socket.h>
#ifdef TCPCONN
#include <netinet/in.h>
#endif
#ifdef DNETCONN
#include <netdnet/dn.h>
#endif
#include <arpa/inet.h>
#include <krb5/krb5.h>
/* 9/93: krb5.h leaks some symbols */
#undef BITS32
#undef xfree
#include <krb5/los-proto.h>
#include "X.h"
#include "os.h"
#include "osdep.h"
#include "Xproto.h"
#include "Xfuncs.h"
#include "dixstruct.h"
#include <com_err.h>
#include "Xauth.h"

extern int (*k5_Vector[256])();
extern int SendConnSetup();
extern char *display;		/* need this to generate rcache name */

static XID krb5_id = ~0L;
static krb5_principal srvname = NULL; /* service name */
static char *ccname = NULL;
static char *ktname = NULL;	/* key table name */
static char kerror[256];

/*
 * tgt_keyproc:
 *
 * extract session key from a credentials struct
 */
krb5_error_code tgt_keyproc(keyprocarg, principal, vno, key)
    krb5_pointer keyprocarg;
    krb5_principal principal;
    krb5_kvno vno;
    krb5_keyblock **key;
{
    krb5_creds *creds = (krb5_creds *)keyprocarg;
    
    return krb5_copy_keyblock(&creds->keyblock, key);
}

/*
 * k5_cmpenc:
 *
 * compare "encoded" principals
 */
Bool k5_cmpenc(pname, plen, buf)
    unsigned char *pname;
    short plen;
    krb5_data *buf;
{
    return (plen == buf->length &&
	    memcmp(pname, buf->data, plen) == 0);
}

/*
 * K5Check:
 *
 * This is stage 0 of the krb5 authentication protocol.  It
 * goes through the current credentials cache and extracts the
 * primary principal and tgt to send to the client, or as
 * appropriate, extracts from a keytab.
 *
 * The packet sent to the client has the following format:
 *
 * CARD8	reqType	= 2
 * CARD8	data	= 0
 * CARD16	length	= total length of packet (in 32 bit units)
 * CARD16	plen	= length of encoded principal following
 * STRING8	princ	= encoded principal
 * STRING8	ticket	= server tgt
 *
 * For client-server authentication, the packet is as follows:
 *
 * CARD8	reqType	= 3
 * CARD8	data	= 0
 * CARD16	length	= total length
 * STRING8	princ	= encoded principal of server
 */
XID K5Check(data_length, data, client, reason)
    unsigned short data_length;
    char *data;
    ClientPtr client;
    char **reason;
{
    krb5_error_code retval;
    CARD16 tlen;
    krb5_principal sprinc, cprinc;
    krb5_ccache cc;
    krb5_creds *creds;
    char *outbuf, *cp;
    krb5_data princ;
    register char n;
    xReq prefix;

    if (krb5_id == ~0L)
	return ~0L;
    if (!ccname && !srvname)
	return ~0L;
    if (ccname)
    {
	if ((creds = (krb5_creds *)malloc(sizeof(krb5_creds))) == NULL)
	    return ~0L;
	if (retval = krb5_cc_resolve(ccname, &cc))
	    return ~0L;
	bzero((char*)creds, sizeof (krb5_creds));
	if (retval = krb5_cc_get_principal(cc, &cprinc))
	{
	    krb5_free_creds(creds);
	    krb5_cc_close(cc);
	    return ~0L;
	}
	creds->client = cprinc;
	if (retval =
	    krb5_build_principal_ext(&sprinc, 
				     krb5_princ_realm(creds->client)->length,
				     krb5_princ_realm(creds->client)->data,
				     6, "krbtgt",
				     krb5_princ_realm(creds->client)->length,
				     krb5_princ_realm(creds->client)->data,
				     0))
	{
	    krb5_free_creds(creds);
	    krb5_cc_close(cc);
	    return ~0L;
	}
	creds->server = sprinc;
	retval = krb5_get_credentials(KRB5_GC_CACHED, cc, creds);
	krb5_cc_close(cc);
	if (retval)
	{
	    krb5_free_creds(creds);
	    return ~0L;
	}
	if (retval = XauKrb5Encode(cprinc, &princ))
	{
	    krb5_free_creds(creds);
	    return ~0L;
	}
	tlen = sz_xReq + 2 + princ.length + creds->ticket.length;
	prefix.reqType = 2;	/* opcode = authenticate user-to-user */
    }
    else if (srvname)
    {
	if (retval = XauKrb5Encode(srvname, &princ))
	{
	    return ~0L;
	}
	tlen = sz_xReq + princ.length;
	prefix.reqType = 3;	/* opcode = authenticate client-server */
    }
    prefix.data = 0;		/* stage = 0 */
    prefix.length = (tlen + 3) >> 2; /* round up to nearest multiple
					of 4 bytes */
    if (client->swapped)
    {
	swaps(&prefix.length, n);
    }
    if ((cp = outbuf = (char *)malloc(tlen)) == NULL)
    {
	if (ccname)
	{
	    krb5_free_creds(creds);
	}
	free(princ.data);
	return ~0L;
    }
    memcpy(cp, &prefix, sz_xReq);
    cp += sz_xReq;
    if (ccname)
    {
	memcpy(cp, &princ.length, 2);
	if (client->swapped)
	{
	    swaps((CARD16 *)cp, n);
	}
	cp += 2;
    }
    memcpy(cp, princ.data, princ.length);
    cp += princ.length;
    free(princ.data);		/* we don't need that anymore */
    if (ccname)
	memcpy(cp, creds->ticket.data, creds->ticket.length);
    WriteToClient(client, tlen, outbuf);
    free(outbuf);
    client->requestVector = k5_Vector; /* hack in our dispatch vector */
    client->clientState = ClientStateAuthenticating;
    if (ccname)
    {
	((OsCommPtr)client->osPrivate)->authstate.srvcreds = (pointer)creds; /* save tgt creds */
	((OsCommPtr)client->osPrivate)->authstate.ktname = NULL;
	((OsCommPtr)client->osPrivate)->authstate.srvname = NULL;
    }
    if (srvname)
    {
	((OsCommPtr)client->osPrivate)->authstate.srvcreds = NULL;
	((OsCommPtr)client->osPrivate)->authstate.ktname = (pointer)ktname;
	((OsCommPtr)client->osPrivate)->authstate.srvname = (pointer)srvname;
    }
    ((OsCommPtr)client->osPrivate)->authstate.stageno = 1; /* next stage is 1 */
    return krb5_id;
}

/*
 * k5_stage1:
 *
 * This gets called out of the dispatcher after K5Check frobs with the
 * client->requestVector.  It accepts the ap_req from the client and verifies
 * it.  In addition, if the client has set AP_OPTS_MUTUAL_REQUIRED, it then
 * sends an ap_rep to the client to achieve mutual authentication.
 *
 * client stage1 packet format is as follows:
 *
 * CARD8	reqType	= 1
 * CARD8	data	= ignored
 * CARD16	length	= total length
 * STRING8	data	= the actual ap_req
 *
 * stage2 packet sent back to client for mutual authentication:
 *
 * CARD8	reqType	= 2
 * CARD8	data	= 2
 * CARD16	length	= total length
 * STRING8	data	= the ap_rep
 */
int k5_stage1(client)
    register ClientPtr client;
{
    long addrlen;
    krb5_error_code retval, retval2;
    register char n;
    struct sockaddr cli_net_addr;
    xReq prefix;
    krb5_principal cprinc;
    krb5_data buf;
    krb5_creds *creds = (krb5_creds *)((OsCommPtr)client->osPrivate)->authstate.srvcreds;
    krb5_keyblock *skey;
    krb5_address cli_addr, **localaddrs = NULL;
    krb5_tkt_authent *authdat;
    krb5_ap_rep_enc_part rep;
    krb5_int32 ctime, cusec;
    krb5_rcache rcache = NULL;
    char *cachename = NULL, *rc_type = NULL, *rc_base = "rcX", *kt = NULL;
    REQUEST(xReq);

    if (((OsCommPtr)client->osPrivate)->authstate.stageno != 1)
    {
	if (creds)
	    krb5_free_creds(creds);
	return(SendConnSetup(client, "expected Krb5 stage1 packet"));
    }
    addrlen = sizeof (cli_net_addr);
    if (getpeername(((OsCommPtr)client->osPrivate)->fd,
		    &cli_net_addr, &addrlen) == -1)
    {
	if (creds)
	    krb5_free_creds(creds);
	return(SendConnSetup(client, "Krb5 stage1: getpeername failed"));
    }
    if (cli_net_addr.sa_family == AF_UNSPEC
#if defined(UNIXCONN) || defined(LOCALCONN) || defined(OS2PIPECONN)
	|| cli_net_addr.sa_family == AF_UNIX
#endif
	)			/* assume local host */
    {
	krb5_os_localaddr(&localaddrs);
	if (!localaddrs || !localaddrs[0])
	{
	    if (creds)
		krb5_free_creds(creds);
	    return(SendConnSetup(client, "Krb5 failed to get localaddrs"));
	}
	cli_addr.addrtype = localaddrs[0]->addrtype;
	cli_addr.length = localaddrs[0]->length;
	cli_addr.contents = localaddrs[0]->contents;
    }
    else
    {
	cli_addr.addrtype = cli_net_addr.sa_family; /* the values
						       are compatible */
	switch (cli_net_addr.sa_family)
	{
#ifdef TCPCONN
	case AF_INET:
	    cli_addr.length = sizeof (struct in_addr);
	    cli_addr.contents =
		(krb5_octet *)&((struct sockaddr_in *)&cli_net_addr)->sin_addr;
	    break;
#endif
#ifdef DNETCONN
	case AF_DECnet:
	    cli_addr.length = sizeof (struct dn_naddr);
	    cli_addr.contents =
		(krb5_octet *)&((struct sockaddr_dn *)&cli_net_addr)->sdn_add;
	    break;
#endif
	default:
	    if (localaddrs)
		krb5_free_addresses(localaddrs);
	    if (creds)
		krb5_free_creds(creds);
	    sprintf(kerror, "Krb5 stage1: unknown address family %d from getpeername",
		    cli_net_addr.sa_family);    
	    return(SendConnSetup(client, kerror));
	}
    }
    if ((rcache = (krb5_rcache)malloc(sizeof(*rcache))) == NULL)
    {
	if (localaddrs)
	    krb5_free_addresses(localaddrs);
	if (creds)
	    krb5_free_creds(creds);
	return(SendConnSetup(client, "malloc bombed for krb5_rcache"));
    }
    if ((rc_type = krb5_rc_default_type()) == NULL)
	rc_type = "dfl";
    if (retval = krb5_rc_resolve_type(&rcache, rc_type))
    {
	if (localaddrs)
	    krb5_free_addresses(localaddrs);
	if (creds)
	    krb5_free_creds(creds);
	free(rcache);
	strcpy(kerror, "krb5_rc_resolve_type failed: ");
	strncat(kerror, error_message(retval), 231);
	return(SendConnSetup(client, kerror));
    }
    if ((cachename = (char *)malloc(strlen(rc_base) + strlen(display) + 1))
	== NULL)
    {
	if (localaddrs)
	    krb5_free_addresses(localaddrs);
	if (creds)
	    krb5_free_creds(creds);
	free(rcache);
	return(SendConnSetup(client, "Krb5: malloc bombed for cachename"));
    }
    strcpy(cachename, rc_base);
    strcat(cachename, display);
    if (retval = krb5_rc_resolve(rcache, cachename))
    {
	if (localaddrs)
	    krb5_free_addresses(localaddrs);
	if (creds)
	    krb5_free_creds(creds);
	free(rcache);
	free(cachename);
	strcpy(kerror, "krb5_rc_resolve failed: ");
	strncat(kerror, error_message(retval), 236);
	return(SendConnSetup(client, kerror));
    }
    free(cachename);
    if (krb5_rc_recover(rcache))
    {
	extern krb5_deltat krb5_clockskew;
	if (retval = krb5_rc_initialize(rcache, krb5_clockskew))
	{
	    if (localaddrs)
		krb5_free_addresses(localaddrs);
	    if (creds)
		krb5_free_creds(creds);
	    if (retval2 = krb5_rc_close(rcache))
	    {
		strcpy(kerror, "krb5_rc_close failed: ");
		strncat(kerror, error_message(retval2), 238);
		return(SendConnSetup(client, kerror));
	    }
	    free(rcache);
	    strcpy(kerror, "krb5_rc_initialize failed: ");
	    strncat(kerror, error_message(retval), 233);
	    return(SendConnSetup(client, kerror));
	}
    }
    buf.length = (stuff->length << 2) - sz_xReq;
    buf.data = (char *)stuff + sz_xReq;
    if (creds)
    {
	retval = krb5_rd_req(&buf,
			     NULL, /* don't bother with server name */
			     &cli_addr,
			     NULL, /* no fetchfrom */
			     tgt_keyproc,
			     creds, /* credentials as arg to
				       keyproc */
			     rcache,
			     &authdat);
	krb5_free_creds(creds);
    }
    else if (kt = (char *)((OsCommPtr)client->osPrivate)->authstate.ktname)
    {
	retval = krb5_rd_req(&buf, srvname, &cli_addr, kt, NULL, NULL,
			     rcache, &authdat);
	((OsCommPtr)client->osPrivate)->authstate.ktname = NULL;
    }
    else
    {
	if (localaddrs)
	    krb5_free_addresses(localaddrs);
	return(SendConnSetup(client, "Krb5: neither srvcreds nor ktname set"));
    }
    if (localaddrs)
	krb5_free_addresses(localaddrs);
    if (rcache)
    {
	if (retval2 = krb5_rc_close(rcache))
	{
	    strcpy(kerror, "krb5_rc_close failed (2): ");
	    strncat(kerror, error_message(retval2), 230);
	    return(SendConnSetup(client, kerror));
	}
	free(rcache);
    }
    if (retval)
    {
	strcpy(kerror, "Krb5: Bad application request: ");
	strncat(kerror, error_message(retval), 224);
	return(SendConnSetup(client, kerror));
    }
    cprinc = authdat->ticket->enc_part2->client;
    skey = authdat->ticket->enc_part2->session;
    if (XauKrb5Encode(cprinc, &buf))
    {
	krb5_free_tkt_authent(authdat);
	return(SendConnSetup(client, "XauKrb5Encode bombed"));
    }
    /*
     * Now check to see if the principal we got is one that we want to let in
     */
    if (ForEachHostInFamily(FamilyKrb5Principal, k5_cmpenc, (pointer)&buf))
    {
	free(buf.data);
	/*
	 * The following deals with sending an ap_rep to the client to
	 * achieve mutual authentication.  The client sends back a stage 3
	 * packet if all is ok.
	 */
	if (authdat->ap_options | AP_OPTS_MUTUAL_REQUIRED)
	{
	    /*
	     * stage 2: send ap_rep to client
	     */
	    if (retval = krb5_us_timeofday(&ctime, &cusec))
	    {
		krb5_free_tkt_authent(authdat);
		strcpy(kerror, "error in krb5_us_timeofday: ");
		strncat(kerror, error_message(retval), 234);
		return(SendConnSetup(client, kerror));
	    }
	    rep.ctime = ctime;
	    rep.cusec = cusec;
	    rep.subkey = NULL;
	    rep.seq_number = 0;
	    if (retval = krb5_mk_rep(&rep, skey, &buf))
	    {
		krb5_free_tkt_authent(authdat);
		strcpy(kerror, "error in krb5_mk_rep: ");
		strncat(kerror, error_message(retval), 238);
		return(SendConnSetup(client, kerror));
	    }
	    prefix.reqType = 2;	/* opcode = authenticate */
	    prefix.data = 2;	/* stage = 2 */
	    prefix.length = (buf.length + sz_xReq + 3) >> 2;
	    if (client->swapped)
	    {
		swaps(&prefix.length, n);
	    }
	    WriteToClient(client, sz_xReq, (char *)&prefix);
	    WriteToClient(client, buf.length, buf.data);
	    free(buf.data);
	    krb5_free_tkt_authent(authdat);
	    ((OsCommPtr)client->osPrivate)->authstate.stageno = 3; /* expect stage3 packet */
	    return(Success);
	}
	else
	{
	    free(buf.data);
	    krb5_free_tkt_authent(authdat);
	    return(SendConnSetup(client, NULL)); /* success! */
	}
    }
    else
    {
	char *kname;
	
	krb5_free_tkt_authent(authdat);
	free(buf.data);
	retval = krb5_unparse_name(cprinc, &kname);
	if (retval == 0)
	{
	    sprintf(kerror, "Principal \"%s\" is not authorized to connect",
		    kname);
	    if (kname)
		free(kname);
	    return(SendConnSetup(client, kerror));
	}
	else
	    return(SendConnSetup(client,"Principal is not authorized to connect to Server"));
    }
}

/*
 * k5_stage3:
 *
 * Get the short ack packet from the client.  This packet can conceivably
 * be expanded to allow for switching on end-to-end encryption.
 *
 * stage3 packet format:
 *
 * CARD8	reqType	= 3
 * CARD8	data	= ignored (for now)
 * CARD16	length	= should be zero
 */
int k5_stage3(client)
    register ClientPtr client;
{
    REQUEST(xReq);

    if (((OsCommPtr)client->osPrivate)->authstate.stageno != 3)
    {
	return(SendConnSetup(client, "expected Krb5 stage3 packet"));
    }
    else
	return(SendConnSetup(client, NULL)); /* success! */
}

k5_bad(client)
    register ClientPtr client;
{
    if (((OsCommPtr)client->osPrivate)->authstate.srvcreds)
	krb5_free_creds((krb5_creds *)((OsCommPtr)client->osPrivate)->authstate.srvcreds);
    sprintf(kerror, "unrecognized Krb5 auth packet %d, expecting %d",
	    ((xReq *)client->requestBuffer)->reqType,
	    ((OsCommPtr)client->osPrivate)->authstate.stageno);
    return(SendConnSetup(client, kerror));
}

/*
 * K5Add:
 *
 * Takes the name of a credentials cache and resolves it.  Also adds the
 * primary principal of the ccache to the acl.
 *
 * Now will also take a service name.
 */
int K5Add(data_length, data, id)
    unsigned short data_length;
    char *data;
    XID id;
{
    krb5_principal princ;
    krb5_error_code retval;
    krb5_keytab_entry tmp_entry;
    krb5_keytab keytab;
    krb5_kvno kvno = 0;
    krb5_ccache cc;
    char *nbuf, *cp;
    krb5_data kbuf;
    int i, ktlen;
    
    krb5_init_ets();		/* can't think of a better place to put it */
    krb5_id = ~0L;
    if (data_length < 3)
	return 0;
    if ((nbuf = (char *)malloc(data_length - 2)) == NULL)
	return 0;
    memcpy(nbuf, data + 3, data_length - 3);
    nbuf[data_length - 3] = '\0';
    if (ccname)
    {
	free(ccname);
	ccname = NULL;
    }
    if (srvname)
    {
	krb5_free_principal(srvname);
	srvname = NULL;
    }
    if (ktname)
    {
	free(ktname);
	ktname = NULL;
    }
    if (!strncmp(data, "UU:", 3))
    {
	if (retval = krb5_cc_resolve(nbuf, &cc))
	{
	    ErrorF("K5Add: krb5_cc_resolve of \"%s\" failed: %s\n",
		   nbuf, error_message(retval));
	    free(nbuf);
	    return 0;
	}
	if (cc && !(retval = krb5_cc_get_principal(cc, &princ)))
	{
	    if (XauKrb5Encode(princ, &kbuf))
	    {
		free(nbuf);
		krb5_free_principal(princ);
		krb5_cc_close(cc);
		return 0;
	    }
	    if (krb5_cc_close(cc))
		return 0;
	    AddHost(NULL, FamilyKrb5Principal, kbuf.length, kbuf.data);
	    krb5_free_principal(princ);
	    free(kbuf.data);
	    ccname = nbuf;
	    krb5_id = id;
	    return 1;
	}
	else
	{
	    ErrorF("K5Add: getting principal from cache \"%s\" failed: %s\n",
		   nbuf, error_message(retval));
	}
    }
    else if (!strncmp(data, "CS:", 3))
    {
	if ((cp = strchr(nbuf, ',')) == NULL)
	{
	    free(nbuf);
	    return 0;
	}
	*cp = '\0';		/* gross but it works :-) */
	ktlen = strlen(cp + 1);
	if ((ktname = (char *)malloc(ktlen + 1)) == NULL)
	{
	    free(nbuf);
	    return 0;
	}
	strcpy(ktname, cp + 1);
	retval = krb5_sname_to_principal(NULL, /* NULL for hostname uses
						  local host name*/
					 nbuf, KRB5_NT_SRV_HST,
					 &srvname);
	free(nbuf);
	if (retval)
	{
	    free(ktname);
	    ktname = NULL;
	    return 0;
	}
	if (retval = krb5_kt_resolve(ktname, &keytab))
	{
	    free(ktname);
	    ktname = NULL;
	    krb5_free_principal(srvname);
	    srvname = NULL;
	    return 0;
	}
	retval = krb5_kt_get_entry(keytab, srvname, kvno, &tmp_entry);
	krb5_kt_free_entry(&tmp_entry);
	if (retval)
	{
	    free(ktname);
	    ktname = NULL;
	    krb5_free_principal(srvname);
	    srvname = NULL;
	    return 0;
	}
	if (XauKrb5Encode(srvname, &kbuf))
	{
	    free(ktname);
	    ktname = NULL;
	    krb5_free_principal(srvname);
	    srvname = NULL;
	    return 0;
	}
	AddHost(NULL, FamilyKrb5Principal, kbuf.length, kbuf.data);
	krb5_id = id;
	return 1;
    }
    else
    {
	ErrorF("K5Add: credentials cache name \"%.*s\" in auth file: unknown type\n",
	       data_length, data);
    }
    return 0;
}

/*
 * K5Reset:
 *
 * Reset krb5_id, also nuke the current principal from the acl.
 */
int K5Reset()
{
    krb5_principal princ;
    krb5_error_code retval;
    krb5_ccache cc;
    krb5_data kbuf;
    int i;
    
    if (ccname)
    {
	if (retval = krb5_cc_resolve(ccname, &cc))
	{
	    free(ccname);
	    ccname = NULL;
	}
	if (cc && !(retval = krb5_cc_get_principal(cc, &princ)))
	{
	    if (XauKrb5Encode(princ, &kbuf))
		return 1;
	    RemoveHost(NULL, FamilyKrb5Principal, kbuf.length, kbuf.data);
	    krb5_free_principal(princ);
	    free(kbuf.data);
	    if (krb5_cc_close(cc))
		return 1;
	    free(ccname);
	    ccname = NULL;
	}
    }
    if (srvname)
    {
	if (XauKrb5Encode(srvname, &kbuf))
	    return 1;
	RemoveHost(NULL, FamilyKrb5Principal, kbuf.length, kbuf.data);
	krb5_free_principal(srvname);
	free(kbuf.data);
	srvname = NULL;
    }
    if (ktname)
    {
	free(ktname);
	ktname = NULL;
    }
    krb5_id = ~0L;
    return 0;
}

XID K5ToID(data_length, data)
    unsigned short data_length;
    char *data;
{
    return krb5_id;
}

int K5FromID(id, data_lenp, datap)
    XID id;
    unsigned short *data_lenp;
    char **datap;
{
    return 0;
}

int K5Remove(data_length, data)
    unsigned short data_length;
    char *data;
{
    return 0;
}