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
|
/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* kdc/do_as_req.c
*
* Portions Copyright (C) 2007 Apple Inc.
* Copyright 1990,1991,2007,2008,2009 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* KDC Routines to deal with AS_REQ's
*/
/*
* Copyright (c) 2006-2008, Novell, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * 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.
* * The copyright holder's name is not used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 "k5-int.h"
#include "com_err.h"
#include <syslog.h>
#ifdef HAVE_NETINET_IN_H
#include <sys/types.h>
#include <netinet/in.h>
#ifndef hpux
#include <arpa/inet.h>
#endif /* hpux */
#endif /* HAVE_NETINET_IN_H */
#include "kdc_util.h"
#include "policy.h"
#include "adm.h"
#include "adm_proto.h"
#include "extern.h"
#if APPLE_PKINIT
#define AS_REQ_DEBUG 0
#if AS_REQ_DEBUG
#define asReqDebug(args...) printf(args)
#else
#define asReqDebug(args...)
#endif
#endif /* APPLE_PKINIT */
static krb5_error_code
prepare_error_as(struct kdc_request_state *, krb5_kdc_req *,
int, krb5_data *, krb5_principal, krb5_data **,
const char *);
/*ARGSUSED*/
krb5_error_code
process_as_req(krb5_kdc_req *request, krb5_data *req_pkt,
const krb5_fulladdr *from, krb5_data **response)
{
krb5_db_entry client, server;
krb5_kdc_rep reply;
krb5_enc_kdc_rep_part reply_encpart;
krb5_ticket ticket_reply;
krb5_enc_tkt_part enc_tkt_reply;
krb5_error_code errcode;
int c_nprincs = 0, s_nprincs = 0;
krb5_boolean more;
krb5_timestamp kdc_time, authtime = 0;
krb5_keyblock session_key;
const char *status;
krb5_key_data *server_key, *client_key;
krb5_keyblock server_keyblock, client_keyblock;
krb5_keyblock *mkey_ptr;
krb5_enctype useenctype;
krb5_data e_data;
register int i;
krb5_timestamp rtime;
char *cname = 0, *sname = 0;
unsigned int c_flags = 0, s_flags = 0;
krb5_principal_data client_princ;
void *pa_context = NULL;
int did_log = 0;
const char *emsg = 0;
krb5_keylist_node *tmp_mkey_list;
struct kdc_request_state *state = NULL;
krb5_data encoded_req_body;
krb5_keyblock *as_encrypting_key = NULL;
#if APPLE_PKINIT
asReqDebug("process_as_req top realm %s name %s\n",
request->client->realm.data, request->client->data->data);
#endif /* APPLE_PKINIT */
ticket_reply.enc_part.ciphertext.data = 0;
e_data.data = 0;
server_keyblock.contents = NULL;
client_keyblock.contents = NULL;
reply.padata = 0;
memset(&reply, 0, sizeof(reply));
session_key.contents = 0;
enc_tkt_reply.authorization_data = NULL;
errcode = kdc_make_rstate(&state);
if (errcode != 0) {
status = "constructing state";
goto errout;
}
if (fetch_asn1_field((unsigned char *) req_pkt->data,
1, 4, &encoded_req_body) != 0) {
errcode = ASN1_BAD_ID;
status = "Finding req_body";
goto errout;
}
errcode = kdc_find_fast(&request, &encoded_req_body,
NULL /*TGS key*/, NULL, state);
if (errcode) {
status = "error decoding FAST";
goto errout;
}
request->kdc_state = state;
if (!request->client) {
status = "NULL_CLIENT";
errcode = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
goto errout;
}
if ((errcode = krb5_unparse_name(kdc_context, request->client, &cname))) {
status = "UNPARSING_CLIENT";
goto errout;
}
limit_string(cname);
if (!request->server) {
status = "NULL_SERVER";
errcode = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
goto errout;
}
if ((errcode = krb5_unparse_name(kdc_context, request->server, &sname))) {
status = "UNPARSING_SERVER";
goto errout;
}
limit_string(sname);
/*
* We set KRB5_KDB_FLAG_CLIENT_REFERRALS_ONLY as a hint
* to the backend to return naming information in lieu
* of cross realm TGS entries.
*/
setflag(c_flags, KRB5_KDB_FLAG_CLIENT_REFERRALS_ONLY);
/*
* Note that according to the referrals draft we should
* always canonicalize enterprise principal names.
*/
if (isflagset(request->kdc_options, KDC_OPT_CANONICALIZE) ||
krb5_princ_type(kdc_context,
request->client) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
setflag(c_flags, KRB5_KDB_FLAG_CANONICALIZE);
}
if (include_pac_p(kdc_context, request)) {
setflag(c_flags, KRB5_KDB_FLAG_INCLUDE_PAC);
}
c_nprincs = 1;
if ((errcode = krb5_db_get_principal_ext(kdc_context, request->client,
c_flags, &client, &c_nprincs,
&more))) {
status = "LOOKING_UP_CLIENT";
c_nprincs = 0;
goto errout;
}
if (more) {
status = "NON-UNIQUE_CLIENT";
errcode = KRB5KDC_ERR_PRINCIPAL_NOT_UNIQUE;
goto errout;
} else if (c_nprincs != 1) {
status = "CLIENT_NOT_FOUND";
if (vague_errors)
errcode = KRB5KRB_ERR_GENERIC;
else
errcode = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
goto errout;
}
/*
* If the backend returned a principal that is not in the local
* realm, then we need to refer the client to that realm.
*/
if (!is_local_principal(client.princ)) {
/* Entry is a referral to another realm */
status = "REFERRAL";
errcode = KRB5KDC_ERR_WRONG_REALM;
goto errout;
}
#if 0
/*
* Turn off canonicalization if client is marked DES only
* (unless enterprise principal name was requested)
*/
if (isflagset(client.attributes, KRB5_KDB_NON_MS_PRINCIPAL) &&
krb5_princ_type(kdc_context,
request->client) != KRB5_NT_ENTERPRISE_PRINCIPAL) {
clear(c_flags, KRB5_KDB_FLAG_CANONICALIZE);
}
#endif
s_flags = 0;
if (isflagset(request->kdc_options, KDC_OPT_CANONICALIZE)) {
setflag(s_flags, KRB5_KDB_FLAG_CANONICALIZE);
}
s_nprincs = 1;
if ((errcode = krb5_db_get_principal_ext(kdc_context, request->server,
s_flags, &server,
&s_nprincs, &more))) {
status = "LOOKING_UP_SERVER";
goto errout;
}
if (more) {
status = "NON-UNIQUE_SERVER";
errcode = KRB5KDC_ERR_PRINCIPAL_NOT_UNIQUE;
goto errout;
} else if (s_nprincs != 1) {
status = "SERVER_NOT_FOUND";
errcode = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
goto errout;
}
if ((errcode = krb5_timeofday(kdc_context, &kdc_time))) {
status = "TIMEOFDAY";
goto errout;
}
authtime = kdc_time; /* for audit_as_request() */
if ((errcode = validate_as_request(request, client, server,
kdc_time, &status, &e_data))) {
if (!status)
status = "UNKNOWN_REASON";
errcode += ERROR_TABLE_BASE_krb5;
goto errout;
}
/*
* Select the keytype for the ticket session key.
*/
if ((useenctype = select_session_keytype(kdc_context, &server,
request->nktypes,
request->ktype)) == 0) {
/* unsupported ktype */
status = "BAD_ENCRYPTION_TYPE";
errcode = KRB5KDC_ERR_ETYPE_NOSUPP;
goto errout;
}
if ((errcode = krb5_c_make_random_key(kdc_context, useenctype,
&session_key))) {
status = "RANDOM_KEY_FAILED";
goto errout;
}
/*
* Canonicalization is only effective if we are issuing a TGT
* (the intention is to allow support for Windows "short" realm
* aliases, nothing more).
*/
if (isflagset(s_flags, KRB5_KDB_FLAG_CANONICALIZE) &&
krb5_is_tgs_principal(request->server) &&
krb5_is_tgs_principal(server.princ)) {
ticket_reply.server = server.princ;
} else {
ticket_reply.server = request->server;
}
enc_tkt_reply.flags = 0;
enc_tkt_reply.times.authtime = authtime;
setflag(enc_tkt_reply.flags, TKT_FLG_INITIAL);
setflag(enc_tkt_reply.flags, TKT_FLG_ENC_PA_REP);
/*
* It should be noted that local policy may affect the
* processing of any of these flags. For example, some
* realms may refuse to issue renewable tickets
*/
if (isflagset(request->kdc_options, KDC_OPT_FORWARDABLE))
setflag(enc_tkt_reply.flags, TKT_FLG_FORWARDABLE);
if (isflagset(request->kdc_options, KDC_OPT_PROXIABLE))
setflag(enc_tkt_reply.flags, TKT_FLG_PROXIABLE);
if (isflagset(request->kdc_options, KDC_OPT_ALLOW_POSTDATE))
setflag(enc_tkt_reply.flags, TKT_FLG_MAY_POSTDATE);
enc_tkt_reply.session = &session_key;
if (isflagset(c_flags, KRB5_KDB_FLAG_CANONICALIZE)) {
client_princ = *(client.princ);
} else {
client_princ = *(request->client);
/* The realm is always canonicalized */
client_princ.realm = *(krb5_princ_realm(context, client.princ));
}
enc_tkt_reply.client = &client_princ;
enc_tkt_reply.transited.tr_type = KRB5_DOMAIN_X500_COMPRESS;
enc_tkt_reply.transited.tr_contents = empty_string; /* equivalent of "" */
if (isflagset(request->kdc_options, KDC_OPT_POSTDATED)) {
setflag(enc_tkt_reply.flags, TKT_FLG_POSTDATED);
setflag(enc_tkt_reply.flags, TKT_FLG_INVALID);
enc_tkt_reply.times.starttime = request->from;
} else
enc_tkt_reply.times.starttime = kdc_time;
kdc_get_ticket_endtime(kdc_context,
enc_tkt_reply.times.starttime,
kdc_infinity,
request->till,
&client,
&server,
&enc_tkt_reply.times.endtime);
if (isflagset(request->kdc_options, KDC_OPT_RENEWABLE_OK) &&
!isflagset(client.attributes, KRB5_KDB_DISALLOW_RENEWABLE) &&
(enc_tkt_reply.times.endtime < request->till)) {
/* we set the RENEWABLE option for later processing */
setflag(request->kdc_options, KDC_OPT_RENEWABLE);
request->rtime = request->till;
}
rtime = (request->rtime == 0) ? kdc_infinity : request->rtime;
if (isflagset(request->kdc_options, KDC_OPT_RENEWABLE)) {
/*
* XXX Should we squelch the output renew_till to be no
* earlier than the endtime of the ticket?
*/
setflag(enc_tkt_reply.flags, TKT_FLG_RENEWABLE);
enc_tkt_reply.times.renew_till =
min(rtime, enc_tkt_reply.times.starttime +
min(client.max_renewable_life,
min(server.max_renewable_life,
max_renewable_life_for_realm)));
} else
enc_tkt_reply.times.renew_till = 0; /* XXX */
/*
* starttime is optional, and treated as authtime if not present.
* so we can nuke it if it matches
*/
if (enc_tkt_reply.times.starttime == enc_tkt_reply.times.authtime)
enc_tkt_reply.times.starttime = 0;
enc_tkt_reply.caddrs = request->addresses;
enc_tkt_reply.authorization_data = 0;
/* If anonymous requests are being used, adjust the realm of the client principal*/
if (request->kdc_options & KDC_OPT_REQUEST_ANONYMOUS) {
if (!krb5_principal_compare_any_realm(kdc_context, request->client,
krb5_anonymous_principal())) {
errcode = KRB5KDC_ERR_BADOPTION;
status = "Anonymous requested but anonymous principal not used.";
goto errout;
}
krb5_free_principal(kdc_context, request->client);
errcode = krb5_copy_principal(kdc_context, krb5_anonymous_principal(),
&request->client);
if (errcode) {
status = "Copying anonymous principal";
goto errout;
}
}
/*
* Check the preauthentication if it is there.
*/
if (request->padata) {
errcode = check_padata(kdc_context, &client, req_pkt, request,
&enc_tkt_reply, &pa_context, &e_data);
if (errcode) {
if (errcode == KRB5KDC_ERR_PREAUTH_FAILED)
get_preauth_hint_list(request, &client, &server, &e_data);
status = "PREAUTH_FAILED";
if (vague_errors)
errcode = KRB5KRB_ERR_GENERIC;
goto errout;
}
}
/*
* Final check before handing out ticket: If the client requires
* preauthentication, verify that the proper kind of
* preauthentication was carried out.
*/
status = missing_required_preauth(&client, &server, &enc_tkt_reply);
if (status) {
errcode = KRB5KDC_ERR_PREAUTH_REQUIRED;
get_preauth_hint_list(request, &client, &server, &e_data);
goto errout;
}
if ((errcode = validate_forwardable(request, client, server,
kdc_time, &status))) {
errcode += ERROR_TABLE_BASE_krb5;
goto errout;
}
ticket_reply.enc_part2 = &enc_tkt_reply;
/*
* Find the server key
*/
if ((errcode = krb5_dbe_find_enctype(kdc_context, &server,
-1, /* ignore keytype */
-1, /* Ignore salttype */
0, /* Get highest kvno */
&server_key))) {
status = "FINDING_SERVER_KEY";
goto errout;
}
if ((errcode = krb5_dbe_find_mkey(kdc_context, master_keylist, &server,
&mkey_ptr))) {
/* try refreshing master key list */
/* XXX it would nice if we had the mkvno here for optimization */
if (krb5_db_fetch_mkey_list(kdc_context, master_princ,
&master_keyblock, 0, &tmp_mkey_list) == 0) {
krb5_dbe_free_key_list(kdc_context, master_keylist);
master_keylist = tmp_mkey_list;
if ((errcode = krb5_dbe_find_mkey(kdc_context, master_keylist,
&server, &mkey_ptr))) {
status = "FINDING_MASTER_KEY";
goto errout;
}
} else {
status = "FINDING_MASTER_KEY";
goto errout;
}
}
/*
* Convert server.key into a real key
* (it may be encrypted in the database)
*
* server_keyblock is later used to generate auth data signatures
*/
if ((errcode = krb5_dbekd_decrypt_key_data(kdc_context, mkey_ptr,
server_key, &server_keyblock,
NULL))) {
status = "DECRYPT_SERVER_KEY";
goto errout;
}
/*
* Find the appropriate client key. We search in the order specified
* by request keytype list.
*/
client_key = (krb5_key_data *) NULL;
for (i = 0; i < request->nktypes; i++) {
useenctype = request->ktype[i];
if (!krb5_c_valid_enctype(useenctype))
continue;
if (!krb5_dbe_find_enctype(kdc_context, &client, useenctype, -1,
0, &client_key))
break;
}
if (!(client_key)) {
/* Cannot find an appropriate key */
status = "CANT_FIND_CLIENT_KEY";
errcode = KRB5KDC_ERR_ETYPE_NOSUPP;
goto errout;
}
if ((errcode = krb5_dbe_find_mkey(kdc_context, master_keylist, &client,
&mkey_ptr))) {
/* try refreshing master key list */
/* XXX it would nice if we had the mkvno here for optimization */
if (krb5_db_fetch_mkey_list(kdc_context, master_princ,
&master_keyblock, 0, &tmp_mkey_list) == 0) {
krb5_dbe_free_key_list(kdc_context, master_keylist);
master_keylist = tmp_mkey_list;
if ((errcode = krb5_dbe_find_mkey(kdc_context, master_keylist,
&client, &mkey_ptr))) {
status = "FINDING_MASTER_KEY";
goto errout;
}
} else {
status = "FINDING_MASTER_KEY";
goto errout;
}
}
/* convert client.key_data into a real key */
if ((errcode = krb5_dbekd_decrypt_key_data(kdc_context, mkey_ptr,
client_key, &client_keyblock,
NULL))) {
status = "DECRYPT_CLIENT_KEY";
goto errout;
}
client_keyblock.enctype = useenctype;
/* Start assembling the response */
reply.msg_type = KRB5_AS_REP;
reply.client = enc_tkt_reply.client; /* post canonicalization */
reply.ticket = &ticket_reply;
reply_encpart.session = &session_key;
if ((errcode = fetch_last_req_info(&client, &reply_encpart.last_req))) {
status = "FETCH_LAST_REQ";
goto errout;
}
reply_encpart.nonce = request->nonce;
reply_encpart.key_exp = client.expiration;
reply_encpart.flags = enc_tkt_reply.flags;
reply_encpart.server = ticket_reply.server;
/* copy the time fields EXCEPT for authtime; it's location
* is used for ktime
*/
reply_encpart.times = enc_tkt_reply.times;
reply_encpart.times.authtime = authtime = kdc_time;
reply_encpart.caddrs = enc_tkt_reply.caddrs;
reply_encpart.enc_padata = NULL;
/* Fetch the padata info to be returned (do this before
* authdata to handle possible replacement of reply key
*/
errcode = return_padata(kdc_context, &client, req_pkt, request,
&reply, client_key, &client_keyblock, &pa_context);
if (errcode) {
status = "KDC_RETURN_PADATA";
goto errout;
}
#if APPLE_PKINIT
asReqDebug("process_as_req reply realm %s name %s\n",
reply.client->realm.data, reply.client->data->data);
#endif /* APPLE_PKINIT */
errcode = handle_authdata(kdc_context,
c_flags,
&client,
&server,
&server,
&client_keyblock,
&server_keyblock,
&server_keyblock,
req_pkt,
request,
NULL, /* for_user_princ */
NULL, /* enc_tkt_request */
&enc_tkt_reply);
if (errcode) {
krb5_klog_syslog(LOG_INFO, "AS_REQ : handle_authdata (%d)", errcode);
status = "HANDLE_AUTHDATA";
goto errout;
}
errcode = krb5_encrypt_tkt_part(kdc_context, &server_keyblock,
&ticket_reply);
if (errcode) {
status = "ENCRYPTING_TICKET";
goto errout;
}
ticket_reply.enc_part.kvno = server_key->key_data_kvno;
errcode = kdc_fast_response_handle_padata(state, request, &reply,
client_keyblock.enctype);
if (errcode) {
status = "fast response handling";
goto errout;
}
/* now encode/encrypt the response */
reply.enc_part.enctype = client_keyblock.enctype;
errcode = kdc_fast_handle_reply_key(state, &client_keyblock,
&as_encrypting_key);
if (errcode) {
status = "generating reply key";
goto errout;
}
errcode = return_enc_padata(kdc_context, req_pkt, request,
as_encrypting_key, &server, &reply_encpart);
if (errcode) {
status = "KDC_RETURN_ENC_PADATA";
goto errout;
}
errcode = krb5_encode_kdc_rep(kdc_context, KRB5_AS_REP, &reply_encpart,
0, as_encrypting_key, &reply, response);
reply.enc_part.kvno = client_key->key_data_kvno;
if (errcode) {
status = "ENCODE_KDC_REP";
goto errout;
}
/* these parts are left on as a courtesy from krb5_encode_kdc_rep so we
can use them in raw form if needed. But, we don't... */
memset(reply.enc_part.ciphertext.data, 0, reply.enc_part.ciphertext.length);
free(reply.enc_part.ciphertext.data);
log_as_req(from, request, &reply, &client, cname, &server, sname,
authtime, 0, 0, 0);
did_log = 1;
goto egress;
errout:
assert (status != 0);
/* fall through */
egress:
if (pa_context)
free_padata_context(kdc_context, &pa_context);
if (as_encrypting_key)
krb5_free_keyblock(kdc_context, as_encrypting_key);
if (errcode)
emsg = krb5_get_error_message(kdc_context, errcode);
if (status) {
log_as_req(from, request, &reply, &client, cname, &server, sname,
authtime, status, errcode, emsg);
did_log = 1;
}
if (errcode) {
if (status == 0) {
status = emsg;
}
errcode -= ERROR_TABLE_BASE_krb5;
if (errcode < 0 || errcode > 128)
errcode = KRB_ERR_GENERIC;
errcode = prepare_error_as(state, request, errcode, &e_data,
c_nprincs ? client.princ : NULL,
response, status);
status = 0;
}
if (emsg)
krb5_free_error_message(kdc_context, emsg);
if (enc_tkt_reply.authorization_data != NULL)
krb5_free_authdata(kdc_context, enc_tkt_reply.authorization_data);
if (server_keyblock.contents != NULL)
krb5_free_keyblock_contents(kdc_context, &server_keyblock);
if (client_keyblock.contents != NULL)
krb5_free_keyblock_contents(kdc_context, &client_keyblock);
if (reply.padata != NULL)
krb5_free_pa_data(kdc_context, reply.padata);
if (cname != NULL)
free(cname);
if (sname != NULL)
free(sname);
if (c_nprincs)
krb5_db_free_principal(kdc_context, &client, c_nprincs);
if (s_nprincs)
krb5_db_free_principal(kdc_context, &server, s_nprincs);
if (session_key.contents != NULL)
krb5_free_keyblock_contents(kdc_context, &session_key);
if (ticket_reply.enc_part.ciphertext.data != NULL) {
memset(ticket_reply.enc_part.ciphertext.data , 0,
ticket_reply.enc_part.ciphertext.length);
free(ticket_reply.enc_part.ciphertext.data);
}
krb5_free_data_contents(kdc_context, &e_data);
kdc_free_rstate(state);
request->kdc_state = NULL;
krb5_free_kdc_req(kdc_context, request);
assert(did_log != 0);
return errcode;
}
static krb5_error_code
prepare_error_as (struct kdc_request_state *rstate, krb5_kdc_req *request,
int error, krb5_data *e_data,
krb5_principal canon_client, krb5_data **response,
const char *status)
{
krb5_error errpkt;
krb5_error_code retval;
krb5_data *scratch;
krb5_pa_data **pa = NULL;
krb5_typed_data **td = NULL;
size_t size;
errpkt.ctime = request->nonce;
errpkt.cusec = 0;
if ((retval = krb5_us_timeofday(kdc_context, &errpkt.stime,
&errpkt.susec)))
return(retval);
errpkt.error = error;
errpkt.server = request->server;
if (error == KRB5KDC_ERR_WRONG_REALM)
errpkt.client = canon_client;
else
errpkt.client = request->client;
errpkt.text.length = strlen(status) + 1;
if (!(errpkt.text.data = strdup(status)))
return ENOMEM;
if (!(scratch = (krb5_data *)malloc(sizeof(*scratch)))) {
free(errpkt.text.data);
return ENOMEM;
}
if (e_data != NULL&& e_data->data != NULL) {
errpkt.e_data = *e_data;
} else {
errpkt.e_data.length = 0;
errpkt.e_data.data = NULL;
}
/*We need to try and produce a padata sequence for FAST*/
retval = decode_krb5_padata_sequence(e_data, &pa);
if (retval != 0) {
retval = decode_krb5_typed_data(e_data, &td);
if (retval == 0) {
for (size =0; td[size]; size++);
pa = calloc(size+1, sizeof(*pa));
if (pa == NULL)
retval = ENOMEM;
else
for (size = 0; td[size]; size++) {
krb5_pa_data *pad = malloc(sizeof(krb5_pa_data ));
if (pad == NULL) {
retval = ENOMEM;
break;
}
pad->pa_type = td[size]->type;
pad->contents = td[size]->data;
pad->length = td[size]->length;
pa[size] = pad;
}
krb5_free_typed_data(kdc_context, td);
}
}
retval = kdc_fast_handle_error(kdc_context, rstate,
request, pa, &errpkt);
if (retval == 0)
retval = krb5_mk_error(kdc_context, &errpkt, scratch);
free(errpkt.text.data);
if (retval)
free(scratch);
else
*response = scratch;
krb5_free_pa_data(kdc_context, pa);
return retval;
}
|