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Windows: Remove *_PA_ClientCanon* from export list
[heimdal.git] / kdc / krb5tgs.c
blob6551ad961aad91749ac6a5f6ba064161672b9705
1 /*
2 * Copyright (c) 1997-2008 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include "kdc_locl.h"
35
36 /*
37 * return the realm of a krbtgt-ticket or NULL
38 */
39
40 static Realm
41 get_krbtgt_realm(const PrincipalName *p)
42 {
43 if(p->name_string.len == 2
44 && strcmp(p->name_string.val[0], KRB5_TGS_NAME) == 0)
45 return p->name_string.val[1];
46 else
47 return NULL;
48 }
49
50 /*
51 * The KDC might add a signed path to the ticket authorization data
52 * field. This is to avoid server impersonating clients and the
53 * request constrained delegation.
54 *
55 * This is done by storing a KRB5_AUTHDATA_IF_RELEVANT with a single
56 * entry of type KRB5SignedPath.
57 */
58
59 static krb5_error_code
60 find_KRB5SignedPath(krb5_context context,
61 const AuthorizationData *ad,
62 krb5_data *data)
63 {
64 AuthorizationData child;
65 krb5_error_code ret;
66 int pos;
67
68 if (ad == NULL || ad->len == 0)
69 return KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
70
71 pos = ad->len - 1;
72
73 if (ad->val[pos].ad_type != KRB5_AUTHDATA_IF_RELEVANT)
74 return KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
75
76 ret = decode_AuthorizationData(ad->val[pos].ad_data.data,
77 ad->val[pos].ad_data.length,
78 &child,
79 NULL);
80 if (ret) {
81 krb5_set_error_message(context, ret, "Failed to decode "
82 "IF_RELEVANT with %d", ret);
83 return ret;
84 }
85
86 if (child.len != 1) {
87 free_AuthorizationData(&child);
88 return KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
89 }
90
91 if (child.val[0].ad_type != KRB5_AUTHDATA_SIGNTICKET) {
92 free_AuthorizationData(&child);
93 return KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
94 }
95
96 if (data)
97 ret = der_copy_octet_string(&child.val[0].ad_data, data);
98 free_AuthorizationData(&child);
99 return ret;
100 }
101
102 krb5_error_code
103 _kdc_add_KRB5SignedPath(krb5_context context,
104 krb5_kdc_configuration *config,
105 hdb_entry_ex *krbtgt,
106 krb5_enctype enctype,
107 krb5_principal client,
108 krb5_const_principal server,
109 krb5_principals principals,
110 EncTicketPart *tkt)
111 {
112 krb5_error_code ret;
113 KRB5SignedPath sp;
114 krb5_data data;
115 krb5_crypto crypto = NULL;
116 size_t size = 0;
117
118 if (server && principals) {
119 ret = add_Principals(principals, server);
120 if (ret)
121 return ret;
122 }
123
124 {
125 KRB5SignedPathData spd;
126
127 spd.client = client;
128 spd.authtime = tkt->authtime;
129 spd.delegated = principals;
130 spd.method_data = NULL;
131
132 ASN1_MALLOC_ENCODE(KRB5SignedPathData, data.data, data.length,
133 &spd, &size, ret);
134 if (ret)
135 return ret;
136 if (data.length != size)
137 krb5_abortx(context, "internal asn.1 encoder error");
138 }
139
140 {
141 Key *key;
142 ret = hdb_enctype2key(context, &krbtgt->entry, NULL, enctype, &key);
143 if (ret == 0)
144 ret = krb5_crypto_init(context, &key->key, 0, &crypto);
145 if (ret) {
146 free(data.data);
147 return ret;
148 }
149 }
150
151 /*
152 * Fill in KRB5SignedPath
153 */
154
155 sp.etype = enctype;
156 sp.delegated = principals;
157 sp.method_data = NULL;
158
159 ret = krb5_create_checksum(context, crypto, KRB5_KU_KRB5SIGNEDPATH, 0,
160 data.data, data.length, &sp.cksum);
161 krb5_crypto_destroy(context, crypto);
162 free(data.data);
163 if (ret)
164 return ret;
165
166 ASN1_MALLOC_ENCODE(KRB5SignedPath, data.data, data.length, &sp, &size, ret);
167 free_Checksum(&sp.cksum);
168 if (ret)
169 return ret;
170 if (data.length != size)
171 krb5_abortx(context, "internal asn.1 encoder error");
172
173
174 /*
175 * Add IF-RELEVANT(KRB5SignedPath) to the last slot in
176 * authorization data field.
177 */
178
179 ret = _kdc_tkt_add_if_relevant_ad(context, tkt,
180 KRB5_AUTHDATA_SIGNTICKET, &data);
181 krb5_data_free(&data);
182
183 return ret;
184 }
185
186 static krb5_error_code
187 check_KRB5SignedPath(krb5_context context,
188 krb5_kdc_configuration *config,
189 hdb_entry_ex *krbtgt,
190 krb5_principal cp,
191 EncTicketPart *tkt,
192 krb5_principals *delegated,
193 int *signedpath)
194 {
195 krb5_error_code ret;
196 krb5_data data;
197 krb5_crypto crypto = NULL;
198
199 if (delegated)
200 *delegated = NULL;
201
202 ret = find_KRB5SignedPath(context, tkt->authorization_data, &data);
203 if (ret == 0) {
204 KRB5SignedPathData spd;
205 KRB5SignedPath sp;
206 size_t size = 0;
207
208 ret = decode_KRB5SignedPath(data.data, data.length, &sp, NULL);
209 krb5_data_free(&data);
210 if (ret)
211 return ret;
212
213 spd.client = cp;
214 spd.authtime = tkt->authtime;
215 spd.delegated = sp.delegated;
216 spd.method_data = sp.method_data;
217
218 ASN1_MALLOC_ENCODE(KRB5SignedPathData, data.data, data.length,
219 &spd, &size, ret);
220 if (ret) {
221 free_KRB5SignedPath(&sp);
222 return ret;
223 }
224 if (data.length != size)
225 krb5_abortx(context, "internal asn.1 encoder error");
226
227 {
228 Key *key;
229 ret = hdb_enctype2key(context, &krbtgt->entry, NULL, /* XXX use correct kvno! */
230 sp.etype, &key);
231 if (ret == 0)
232 ret = krb5_crypto_init(context, &key->key, 0, &crypto);
233 if (ret) {
234 free(data.data);
235 free_KRB5SignedPath(&sp);
236 return ret;
237 }
238 }
239 ret = krb5_verify_checksum(context, crypto, KRB5_KU_KRB5SIGNEDPATH,
240 data.data, data.length,
241 &sp.cksum);
242 krb5_crypto_destroy(context, crypto);
243 free(data.data);
244 if (ret) {
245 free_KRB5SignedPath(&sp);
246 kdc_log(context, config, 5,
247 "KRB5SignedPath not signed correctly, not marking as signed");
248 return 0;
249 }
250
251 if (delegated && sp.delegated) {
252
253 *delegated = malloc(sizeof(*sp.delegated));
254 if (*delegated == NULL) {
255 free_KRB5SignedPath(&sp);
256 return ENOMEM;
257 }
258
259 ret = copy_Principals(*delegated, sp.delegated);
260 if (ret) {
261 free_KRB5SignedPath(&sp);
262 free(*delegated);
263 *delegated = NULL;
264 return ret;
265 }
266 }
267 free_KRB5SignedPath(&sp);
268
269 *signedpath = 1;
270 }
271
272 return 0;
273 }
274
275 /*
276 *
277 */
278
279 static krb5_error_code
280 check_PAC(krb5_context context,
281 krb5_kdc_configuration *config,
282 const krb5_principal client_principal,
283 const krb5_principal delegated_proxy_principal,
284 hdb_entry_ex *client,
285 hdb_entry_ex *server,
286 hdb_entry_ex *krbtgt,
287 const EncryptionKey *server_check_key,
288 const EncryptionKey *server_sign_key,
289 const EncryptionKey *krbtgt_sign_key,
290 EncTicketPart *tkt,
291 krb5_data *rspac,
292 int *signedpath)
293 {
294 AuthorizationData *ad = tkt->authorization_data;
295 unsigned i, j;
296 krb5_error_code ret;
297
298 if (ad == NULL || ad->len == 0)
299 return 0;
300
301 for (i = 0; i < ad->len; i++) {
302 AuthorizationData child;
303
304 if (ad->val[i].ad_type != KRB5_AUTHDATA_IF_RELEVANT)
305 continue;
306
307 ret = decode_AuthorizationData(ad->val[i].ad_data.data,
308 ad->val[i].ad_data.length,
309 &child,
310 NULL);
311 if (ret) {
312 krb5_set_error_message(context, ret, "Failed to decode "
313 "IF_RELEVANT with %d", ret);
314 return ret;
315 }
316 for (j = 0; j < child.len; j++) {
317
318 if (child.val[j].ad_type == KRB5_AUTHDATA_WIN2K_PAC) {
319 int signed_pac = 0;
320 krb5_pac pac;
321
322 /* Found PAC */
323 ret = krb5_pac_parse(context,
324 child.val[j].ad_data.data,
325 child.val[j].ad_data.length,
326 &pac);
327 free_AuthorizationData(&child);
328 if (ret)
329 return ret;
330
331 ret = krb5_pac_verify(context, pac, tkt->authtime,
332 client_principal,
333 server_check_key, NULL);
334 if (ret) {
335 krb5_pac_free(context, pac);
336 return ret;
337 }
338
339 ret = _kdc_pac_verify(context, client_principal,
340 delegated_proxy_principal,
341 client, server, krbtgt, &pac, &signed_pac);
342 if (ret) {
343 krb5_pac_free(context, pac);
344 return ret;
345 }
346
347 /*
348 * Only re-sign PAC if we could verify it with the PAC
349 * function. The no-verify case happens when we get in
350 * a PAC from cross realm from a Windows domain and
351 * that there is no PAC verification function.
352 */
353 if (signed_pac) {
354 *signedpath = 1;
355 ret = _krb5_pac_sign(context, pac, tkt->authtime,
356 client_principal,
357 server_sign_key, krbtgt_sign_key, rspac);
358 }
359 krb5_pac_free(context, pac);
360
361 return ret;
362 }
363 }
364 free_AuthorizationData(&child);
365 }
366 return 0;
367 }
368
369 /*
370 *
371 */
372
373 static krb5_error_code
374 check_tgs_flags(krb5_context context,
375 krb5_kdc_configuration *config,
376 KDC_REQ_BODY *b, const EncTicketPart *tgt, EncTicketPart *et)
377 {
378 KDCOptions f = b->kdc_options;
379
380 if(f.validate){
381 if(!tgt->flags.invalid || tgt->starttime == NULL){
382 kdc_log(context, config, 0,
383 "Bad request to validate ticket");
384 return KRB5KDC_ERR_BADOPTION;
385 }
386 if(*tgt->starttime > kdc_time){
387 kdc_log(context, config, 0,
388 "Early request to validate ticket");
389 return KRB5KRB_AP_ERR_TKT_NYV;
390 }
391 /* XXX tkt = tgt */
392 et->flags.invalid = 0;
393 }else if(tgt->flags.invalid){
394 kdc_log(context, config, 0,
395 "Ticket-granting ticket has INVALID flag set");
396 return KRB5KRB_AP_ERR_TKT_INVALID;
397 }
398
399 if(f.forwardable){
400 if(!tgt->flags.forwardable){
401 kdc_log(context, config, 0,
402 "Bad request for forwardable ticket");
403 return KRB5KDC_ERR_BADOPTION;
404 }
405 et->flags.forwardable = 1;
406 }
407 if(f.forwarded){
408 if(!tgt->flags.forwardable){
409 kdc_log(context, config, 0,
410 "Request to forward non-forwardable ticket");
411 return KRB5KDC_ERR_BADOPTION;
412 }
413 et->flags.forwarded = 1;
414 et->caddr = b->addresses;
415 }
416 if(tgt->flags.forwarded)
417 et->flags.forwarded = 1;
418
419 if(f.proxiable){
420 if(!tgt->flags.proxiable){
421 kdc_log(context, config, 0,
422 "Bad request for proxiable ticket");
423 return KRB5KDC_ERR_BADOPTION;
424 }
425 et->flags.proxiable = 1;
426 }
427 if(f.proxy){
428 if(!tgt->flags.proxiable){
429 kdc_log(context, config, 0,
430 "Request to proxy non-proxiable ticket");
431 return KRB5KDC_ERR_BADOPTION;
432 }
433 et->flags.proxy = 1;
434 et->caddr = b->addresses;
435 }
436 if(tgt->flags.proxy)
437 et->flags.proxy = 1;
438
439 if(f.allow_postdate){
440 if(!tgt->flags.may_postdate){
441 kdc_log(context, config, 0,
442 "Bad request for post-datable ticket");
443 return KRB5KDC_ERR_BADOPTION;
444 }
445 et->flags.may_postdate = 1;
446 }
447 if(f.postdated){
448 if(!tgt->flags.may_postdate){
449 kdc_log(context, config, 0,
450 "Bad request for postdated ticket");
451 return KRB5KDC_ERR_BADOPTION;
452 }
453 if(b->from)
454 *et->starttime = *b->from;
455 et->flags.postdated = 1;
456 et->flags.invalid = 1;
457 }else if(b->from && *b->from > kdc_time + context->max_skew){
458 kdc_log(context, config, 0, "Ticket cannot be postdated");
459 return KRB5KDC_ERR_CANNOT_POSTDATE;
460 }
461
462 if(f.renewable){
463 if(!tgt->flags.renewable || tgt->renew_till == NULL){
464 kdc_log(context, config, 0,
465 "Bad request for renewable ticket");
466 return KRB5KDC_ERR_BADOPTION;
467 }
468 et->flags.renewable = 1;
469 ALLOC(et->renew_till);
470 _kdc_fix_time(&b->rtime);
471 *et->renew_till = *b->rtime;
472 }
473 if(f.renew){
474 time_t old_life;
475 if(!tgt->flags.renewable || tgt->renew_till == NULL){
476 kdc_log(context, config, 0,
477 "Request to renew non-renewable ticket");
478 return KRB5KDC_ERR_BADOPTION;
479 }
480 old_life = tgt->endtime;
481 if(tgt->starttime)
482 old_life -= *tgt->starttime;
483 else
484 old_life -= tgt->authtime;
485 et->endtime = *et->starttime + old_life;
486 if (et->renew_till != NULL)
487 et->endtime = min(*et->renew_till, et->endtime);
488 }
489
490 #if 0
491 /* checks for excess flags */
492 if(f.request_anonymous && !config->allow_anonymous){
493 kdc_log(context, config, 0,
494 "Request for anonymous ticket");
495 return KRB5KDC_ERR_BADOPTION;
496 }
497 #endif
498 return 0;
499 }
500
501 /*
502 * Determine if constrained delegation is allowed from this client to this server
503 */
504
505 static krb5_error_code
506 check_constrained_delegation(krb5_context context,
507 krb5_kdc_configuration *config,
508 HDB *clientdb,
509 hdb_entry_ex *client,
510 hdb_entry_ex *server,
511 krb5_const_principal target)
512 {
513 const HDB_Ext_Constrained_delegation_acl *acl;
514 krb5_error_code ret;
515 size_t i;
516
517 /*
518 * constrained_delegation (S4U2Proxy) only works within
519 * the same realm. We use the already canonicalized version
520 * of the principals here, while "target" is the principal
521 * provided by the client.
522 */
523 if(!krb5_realm_compare(context, client->entry.principal, server->entry.principal)) {
524 ret = KRB5KDC_ERR_BADOPTION;
525 kdc_log(context, config, 0,
526 "Bad request for constrained delegation");
527 return ret;
528 }
529
530 if (clientdb->hdb_check_constrained_delegation) {
531 ret = clientdb->hdb_check_constrained_delegation(context, clientdb, client, target);
532 if (ret == 0)
533 return 0;
534 } else {
535 /* if client delegates to itself, that ok */
536 if (krb5_principal_compare(context, client->entry.principal, server->entry.principal) == TRUE)
537 return 0;
538
539 ret = hdb_entry_get_ConstrainedDelegACL(&client->entry, &acl);
540 if (ret) {
541 krb5_clear_error_message(context);
542 return ret;
543 }
544
545 if (acl) {
546 for (i = 0; i < acl->len; i++) {
547 if (krb5_principal_compare(context, target, &acl->val[i]) == TRUE)
548 return 0;
549 }
550 }
551 ret = KRB5KDC_ERR_BADOPTION;
552 }
553 kdc_log(context, config, 0,
554 "Bad request for constrained delegation");
555 return ret;
556 }
557
558 /*
559 * Determine if s4u2self is allowed from this client to this server
560 *
561 * For example, regardless of the principal being impersonated, if the
562 * 'client' and 'server' are the same, then it's safe.
563 */
564
565 static krb5_error_code
566 check_s4u2self(krb5_context context,
567 krb5_kdc_configuration *config,
568 HDB *clientdb,
569 hdb_entry_ex *client,
570 krb5_const_principal server)
571 {
572 krb5_error_code ret;
573
574 /* if client does a s4u2self to itself, that ok */
575 if (krb5_principal_compare(context, client->entry.principal, server) == TRUE)
576 return 0;
577
578 if (clientdb->hdb_check_s4u2self) {
579 ret = clientdb->hdb_check_s4u2self(context, clientdb, client, server);
580 if (ret == 0)
581 return 0;
582 } else {
583 ret = KRB5KDC_ERR_BADOPTION;
584 }
585 return ret;
586 }
587
588 /*
589 *
590 */
591
592 static krb5_error_code
593 verify_flags (krb5_context context,
594 krb5_kdc_configuration *config,
595 const EncTicketPart *et,
596 const char *pstr)
597 {
598 if(et->endtime < kdc_time){
599 kdc_log(context, config, 0, "Ticket expired (%s)", pstr);
600 return KRB5KRB_AP_ERR_TKT_EXPIRED;
601 }
602 if(et->flags.invalid){
603 kdc_log(context, config, 0, "Ticket not valid (%s)", pstr);
604 return KRB5KRB_AP_ERR_TKT_NYV;
605 }
606 return 0;
607 }
608
609 /*
610 *
611 */
612
613 static krb5_error_code
614 fix_transited_encoding(krb5_context context,
615 krb5_kdc_configuration *config,
616 krb5_boolean check_policy,
617 const TransitedEncoding *tr,
618 EncTicketPart *et,
619 const char *client_realm,
620 const char *server_realm,
621 const char *tgt_realm)
622 {
623 krb5_error_code ret = 0;
624 char **realms, **tmp;
625 unsigned int num_realms;
626 size_t i;
627
628 switch (tr->tr_type) {
629 case DOMAIN_X500_COMPRESS:
630 break;
631 case 0:
632 /*
633 * Allow empty content of type 0 because that is was Microsoft
634 * generates in their TGT.
635 */
636 if (tr->contents.length == 0)
637 break;
638 kdc_log(context, config, 0,
639 "Transited type 0 with non empty content");
640 return KRB5KDC_ERR_TRTYPE_NOSUPP;
641 default:
642 kdc_log(context, config, 0,
643 "Unknown transited type: %u", tr->tr_type);
644 return KRB5KDC_ERR_TRTYPE_NOSUPP;
645 }
646
647 ret = krb5_domain_x500_decode(context,
648 tr->contents,
649 &realms,
650 &num_realms,
651 client_realm,
652 server_realm);
653 if(ret){
654 krb5_warn(context, ret,
655 "Decoding transited encoding");
656 return ret;
657 }
658 if(strcmp(client_realm, tgt_realm) && strcmp(server_realm, tgt_realm)) {
659 /* not us, so add the previous realm to transited set */
660 if (num_realms + 1 > UINT_MAX/sizeof(*realms)) {
661 ret = ERANGE;
662 goto free_realms;
663 }
664 tmp = realloc(realms, (num_realms + 1) * sizeof(*realms));
665 if(tmp == NULL){
666 ret = ENOMEM;
667 goto free_realms;
668 }
669 realms = tmp;
670 realms[num_realms] = strdup(tgt_realm);
671 if(realms[num_realms] == NULL){
672 ret = ENOMEM;
673 goto free_realms;
674 }
675 num_realms++;
676 }
677 if(num_realms == 0) {
678 if(strcmp(client_realm, server_realm))
679 kdc_log(context, config, 0,
680 "cross-realm %s -> %s", client_realm, server_realm);
681 } else {
682 size_t l = 0;
683 char *rs;
684 for(i = 0; i < num_realms; i++)
685 l += strlen(realms[i]) + 2;
686 rs = malloc(l);
687 if(rs != NULL) {
688 *rs = '\0';
689 for(i = 0; i < num_realms; i++) {
690 if(i > 0)
691 strlcat(rs, ", ", l);
692 strlcat(rs, realms[i], l);
693 }
694 kdc_log(context, config, 0,
695 "cross-realm %s -> %s via [%s]",
696 client_realm, server_realm, rs);
697 free(rs);
698 }
699 }
700 if(check_policy) {
701 ret = krb5_check_transited(context, client_realm,
702 server_realm,
703 realms, num_realms, NULL);
704 if(ret) {
705 krb5_warn(context, ret, "cross-realm %s -> %s",
706 client_realm, server_realm);
707 goto free_realms;
708 }
709 et->flags.transited_policy_checked = 1;
710 }
711 et->transited.tr_type = DOMAIN_X500_COMPRESS;
712 ret = krb5_domain_x500_encode(realms, num_realms, &et->transited.contents);
713 if(ret)
714 krb5_warn(context, ret, "Encoding transited encoding");
715 free_realms:
716 for(i = 0; i < num_realms; i++)
717 free(realms[i]);
718 free(realms);
719 return ret;
720 }
721
722
723 static krb5_error_code
724 tgs_make_reply(krb5_context context,
725 krb5_kdc_configuration *config,
726 KDC_REQ_BODY *b,
727 krb5_const_principal tgt_name,
728 const EncTicketPart *tgt,
729 const krb5_keyblock *replykey,
730 int rk_is_subkey,
731 const EncryptionKey *serverkey,
732 const krb5_keyblock *sessionkey,
733 krb5_kvno kvno,
734 AuthorizationData *auth_data,
735 hdb_entry_ex *server,
736 krb5_principal server_principal,
737 const char *server_name,
738 hdb_entry_ex *client,
739 krb5_principal client_principal,
740 hdb_entry_ex *krbtgt,
741 krb5_enctype krbtgt_etype,
742 krb5_principals spp,
743 const krb5_data *rspac,
744 const METHOD_DATA *enc_pa_data,
745 const char **e_text,
746 krb5_data *reply)
747 {
748 KDC_REP rep;
749 EncKDCRepPart ek;
750 EncTicketPart et;
751 KDCOptions f = b->kdc_options;
752 krb5_error_code ret;
753 int is_weak = 0;
754
755 memset(&rep, 0, sizeof(rep));
756 memset(&et, 0, sizeof(et));
757 memset(&ek, 0, sizeof(ek));
758
759 rep.pvno = 5;
760 rep.msg_type = krb_tgs_rep;
761
762 et.authtime = tgt->authtime;
763 _kdc_fix_time(&b->till);
764 et.endtime = min(tgt->endtime, *b->till);
765 ALLOC(et.starttime);
766 *et.starttime = kdc_time;
767
768 ret = check_tgs_flags(context, config, b, tgt, &et);
769 if(ret)
770 goto out;
771
772 /* We should check the transited encoding if:
773 1) the request doesn't ask not to be checked
774 2) globally enforcing a check
775 3) principal requires checking
776 4) we allow non-check per-principal, but principal isn't marked as allowing this
777 5) we don't globally allow this
778 */
779
780 #define GLOBAL_FORCE_TRANSITED_CHECK \
781 (config->trpolicy == TRPOLICY_ALWAYS_CHECK)
782 #define GLOBAL_ALLOW_PER_PRINCIPAL \
783 (config->trpolicy == TRPOLICY_ALLOW_PER_PRINCIPAL)
784 #define GLOBAL_ALLOW_DISABLE_TRANSITED_CHECK \
785 (config->trpolicy == TRPOLICY_ALWAYS_HONOUR_REQUEST)
786
787 /* these will consult the database in future release */
788 #define PRINCIPAL_FORCE_TRANSITED_CHECK(P) 0
789 #define PRINCIPAL_ALLOW_DISABLE_TRANSITED_CHECK(P) 0
790
791 ret = fix_transited_encoding(context, config,
792 !f.disable_transited_check ||
793 GLOBAL_FORCE_TRANSITED_CHECK ||
794 PRINCIPAL_FORCE_TRANSITED_CHECK(server) ||
795 !((GLOBAL_ALLOW_PER_PRINCIPAL &&
796 PRINCIPAL_ALLOW_DISABLE_TRANSITED_CHECK(server)) ||
797 GLOBAL_ALLOW_DISABLE_TRANSITED_CHECK),
798 &tgt->transited, &et,
799 krb5_principal_get_realm(context, client_principal),
800 krb5_principal_get_realm(context, server->entry.principal),
801 krb5_principal_get_realm(context, krbtgt->entry.principal));
802 if(ret)
803 goto out;
804
805 copy_Realm(&server_principal->realm, &rep.ticket.realm);
806 _krb5_principal2principalname(&rep.ticket.sname, server_principal);
807 copy_Realm(&tgt_name->realm, &rep.crealm);
808 /*
809 if (f.request_anonymous)
810 _kdc_make_anonymous_principalname (&rep.cname);
811 else */
812
813 copy_PrincipalName(&tgt_name->name, &rep.cname);
814 rep.ticket.tkt_vno = 5;
815
816 ek.caddr = et.caddr;
817 if(et.caddr == NULL)
818 et.caddr = tgt->caddr;
819
820 {
821 time_t life;
822 life = et.endtime - *et.starttime;
823 if(client && client->entry.max_life)
824 life = min(life, *client->entry.max_life);
825 if(server->entry.max_life)
826 life = min(life, *server->entry.max_life);
827 et.endtime = *et.starttime + life;
828 }
829 if(f.renewable_ok && tgt->flags.renewable &&
830 et.renew_till == NULL && et.endtime < *b->till &&
831 tgt->renew_till != NULL)
832 {
833 et.flags.renewable = 1;
834 ALLOC(et.renew_till);
835 *et.renew_till = *b->till;
836 }
837 if(et.renew_till){
838 time_t renew;
839 renew = *et.renew_till - *et.starttime;
840 if(client && client->entry.max_renew)
841 renew = min(renew, *client->entry.max_renew);
842 if(server->entry.max_renew)
843 renew = min(renew, *server->entry.max_renew);
844 *et.renew_till = *et.starttime + renew;
845 }
846
847 if(et.renew_till){
848 *et.renew_till = min(*et.renew_till, *tgt->renew_till);
849 *et.starttime = min(*et.starttime, *et.renew_till);
850 et.endtime = min(et.endtime, *et.renew_till);
851 }
852
853 *et.starttime = min(*et.starttime, et.endtime);
854
855 if(*et.starttime == et.endtime){
856 ret = KRB5KDC_ERR_NEVER_VALID;
857 goto out;
858 }
859 if(et.renew_till && et.endtime == *et.renew_till){
860 free(et.renew_till);
861 et.renew_till = NULL;
862 et.flags.renewable = 0;
863 }
864
865 et.flags.pre_authent = tgt->flags.pre_authent;
866 et.flags.hw_authent = tgt->flags.hw_authent;
867 et.flags.anonymous = tgt->flags.anonymous;
868 et.flags.ok_as_delegate = server->entry.flags.ok_as_delegate;
869
870 if(rspac->length) {
871 /*
872 * No not need to filter out the any PAC from the
873 * auth_data since it's signed by the KDC.
874 */
875 ret = _kdc_tkt_add_if_relevant_ad(context, &et,
876 KRB5_AUTHDATA_WIN2K_PAC, rspac);
877 if (ret)
878 goto out;
879 }
880
881 if (auth_data) {
882 unsigned int i = 0;
883
884 /* XXX check authdata */
885
886 if (et.authorization_data == NULL) {
887 et.authorization_data = calloc(1, sizeof(*et.authorization_data));
888 if (et.authorization_data == NULL) {
889 ret = ENOMEM;
890 krb5_set_error_message(context, ret, "malloc: out of memory");
891 goto out;
892 }
893 }
894 for(i = 0; i < auth_data->len ; i++) {
895 ret = add_AuthorizationData(et.authorization_data, &auth_data->val[i]);
896 if (ret) {
897 krb5_set_error_message(context, ret, "malloc: out of memory");
898 goto out;
899 }
900 }
901
902 /* Filter out type KRB5SignedPath */
903 ret = find_KRB5SignedPath(context, et.authorization_data, NULL);
904 if (ret == 0) {
905 if (et.authorization_data->len == 1) {
906 free_AuthorizationData(et.authorization_data);
907 free(et.authorization_data);
908 et.authorization_data = NULL;
909 } else {
910 AuthorizationData *ad = et.authorization_data;
911 free_AuthorizationDataElement(&ad->val[ad->len - 1]);
912 ad->len--;
913 }
914 }
915 }
916
917 ret = krb5_copy_keyblock_contents(context, sessionkey, &et.key);
918 if (ret)
919 goto out;
920 et.crealm = tgt_name->realm;
921 et.cname = tgt_name->name;
922
923 ek.key = et.key;
924 /* MIT must have at least one last_req */
925 ek.last_req.len = 1;
926 ek.last_req.val = calloc(1, sizeof(*ek.last_req.val));
927 if (ek.last_req.val == NULL) {
928 ret = ENOMEM;
929 goto out;
930 }
931 ek.nonce = b->nonce;
932 ek.flags = et.flags;
933 ek.authtime = et.authtime;
934 ek.starttime = et.starttime;
935 ek.endtime = et.endtime;
936 ek.renew_till = et.renew_till;
937 ek.srealm = rep.ticket.realm;
938 ek.sname = rep.ticket.sname;
939
940 _kdc_log_timestamp(context, config, "TGS-REQ", et.authtime, et.starttime,
941 et.endtime, et.renew_till);
942
943 /* Don't sign cross realm tickets, they can't be checked anyway */
944 {
945 char *r = get_krbtgt_realm(&ek.sname);
946
947 if (r == NULL || strcmp(r, ek.srealm) == 0) {
948 ret = _kdc_add_KRB5SignedPath(context,
949 config,
950 krbtgt,
951 krbtgt_etype,
952 client_principal,
953 NULL,
954 spp,
955 &et);
956 if (ret)
957 goto out;
958 }
959 }
960
961 if (enc_pa_data->len) {
962 rep.padata = calloc(1, sizeof(*rep.padata));
963 if (rep.padata == NULL) {
964 ret = ENOMEM;
965 goto out;
966 }
967 ret = copy_METHOD_DATA(enc_pa_data, rep.padata);
968 if (ret)
969 goto out;
970 }
971
972 if (krb5_enctype_valid(context, serverkey->keytype) != 0
973 && _kdc_is_weak_exception(server->entry.principal, serverkey->keytype))
974 {
975 krb5_enctype_enable(context, serverkey->keytype);
976 is_weak = 1;
977 }
978
979
980 /* It is somewhat unclear where the etype in the following
981 encryption should come from. What we have is a session
982 key in the passed tgt, and a list of preferred etypes
983 *for the new ticket*. Should we pick the best possible
984 etype, given the keytype in the tgt, or should we look
985 at the etype list here as well? What if the tgt
986 session key is DES3 and we want a ticket with a (say)
987 CAST session key. Should the DES3 etype be added to the
988 etype list, even if we don't want a session key with
989 DES3? */
990 ret = _kdc_encode_reply(context, config, NULL, 0,
991 &rep, &et, &ek, serverkey->keytype,
992 kvno,
993 serverkey, 0, replykey, rk_is_subkey,
994 e_text, reply);
995 if (is_weak)
996 krb5_enctype_disable(context, serverkey->keytype);
997
998 out:
999 free_TGS_REP(&rep);
1000 free_TransitedEncoding(&et.transited);
1001 if(et.starttime)
1002 free(et.starttime);
1003 if(et.renew_till)
1004 free(et.renew_till);
1005 if(et.authorization_data) {
1006 free_AuthorizationData(et.authorization_data);
1007 free(et.authorization_data);
1008 }
1009 free_LastReq(&ek.last_req);
1010 memset(et.key.keyvalue.data, 0, et.key.keyvalue.length);
1011 free_EncryptionKey(&et.key);
1012 return ret;
1013 }
1014
1015 static krb5_error_code
1016 tgs_check_authenticator(krb5_context context,
1017 krb5_kdc_configuration *config,
1018 krb5_auth_context ac,
1019 KDC_REQ_BODY *b,
1020 const char **e_text,
1021 krb5_keyblock *key)
1022 {
1023 krb5_authenticator auth;
1024 size_t len = 0;
1025 unsigned char *buf;
1026 size_t buf_size;
1027 krb5_error_code ret;
1028 krb5_crypto crypto;
1029
1030 krb5_auth_con_getauthenticator(context, ac, &auth);
1031 if(auth->cksum == NULL){
1032 kdc_log(context, config, 0, "No authenticator in request");
1033 ret = KRB5KRB_AP_ERR_INAPP_CKSUM;
1034 goto out;
1035 }
1036 /*
1037 * according to RFC1510 it doesn't need to be keyed,
1038 * but according to the latest draft it needs to.
1039 */
1040 if (
1041 #if 0
1042 !krb5_checksum_is_keyed(context, auth->cksum->cksumtype)
1043 ||
1044 #endif
1045 !krb5_checksum_is_collision_proof(context, auth->cksum->cksumtype)) {
1046 kdc_log(context, config, 0, "Bad checksum type in authenticator: %d",
1047 auth->cksum->cksumtype);
1048 ret = KRB5KRB_AP_ERR_INAPP_CKSUM;
1049 goto out;
1050 }
1051
1052 /* XXX should not re-encode this */
1053 ASN1_MALLOC_ENCODE(KDC_REQ_BODY, buf, buf_size, b, &len, ret);
1054 if(ret){
1055 const char *msg = krb5_get_error_message(context, ret);
1056 kdc_log(context, config, 0, "Failed to encode KDC-REQ-BODY: %s", msg);
1057 krb5_free_error_message(context, msg);
1058 goto out;
1059 }
1060 if(buf_size != len) {
1061 free(buf);
1062 kdc_log(context, config, 0, "Internal error in ASN.1 encoder");
1063 *e_text = "KDC internal error";
1064 ret = KRB5KRB_ERR_GENERIC;
1065 goto out;
1066 }
1067 ret = krb5_crypto_init(context, key, 0, &crypto);
1068 if (ret) {
1069 const char *msg = krb5_get_error_message(context, ret);
1070 free(buf);
1071 kdc_log(context, config, 0, "krb5_crypto_init failed: %s", msg);
1072 krb5_free_error_message(context, msg);
1073 goto out;
1074 }
1075 ret = krb5_verify_checksum(context,
1076 crypto,
1077 KRB5_KU_TGS_REQ_AUTH_CKSUM,
1078 buf,
1079 len,
1080 auth->cksum);
1081 free(buf);
1082 krb5_crypto_destroy(context, crypto);
1083 if(ret){
1084 const char *msg = krb5_get_error_message(context, ret);
1085 kdc_log(context, config, 0,
1086 "Failed to verify authenticator checksum: %s", msg);
1087 krb5_free_error_message(context, msg);
1088 }
1089 out:
1090 free_Authenticator(auth);
1091 free(auth);
1092 return ret;
1093 }
1094
1095 /*
1096 *
1097 */
1098
1099 static const char *
1100 find_rpath(krb5_context context, Realm crealm, Realm srealm)
1101 {
1102 const char *new_realm = krb5_config_get_string(context,
1103 NULL,
1104 "capaths",
1105 crealm,
1106 srealm,
1107 NULL);
1108 return new_realm;
1109 }
1110
1111
1112 static krb5_boolean
1113 need_referral(krb5_context context, krb5_kdc_configuration *config,
1114 const KDCOptions * const options, krb5_principal server,
1115 krb5_realm **realms)
1116 {
1117 const char *name;
1118
1119 if(!options->canonicalize && server->name.name_type != KRB5_NT_SRV_INST)
1120 return FALSE;
1121
1122 if (server->name.name_string.len == 1)
1123 name = server->name.name_string.val[0];
1124 else if (server->name.name_string.len == 3) {
1125 /*
1126 This is used to give referrals for the
1127 E3514235-4B06-11D1-AB04-00C04FC2DCD2/NTDSGUID/DNSDOMAIN
1128 SPN form, which is used for inter-domain communication in AD
1129 */
1130 name = server->name.name_string.val[2];
1131 kdc_log(context, config, 0, "Giving 3 part referral for %s", name);
1132 *realms = malloc(sizeof(char *)*2);
1133 if (*realms == NULL) {
1134 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
1135 return FALSE;
1136 }
1137 (*realms)[0] = strdup(name);
1138 (*realms)[1] = NULL;
1139 return TRUE;
1140 } else if (server->name.name_string.len > 1)
1141 name = server->name.name_string.val[1];
1142 else
1143 return FALSE;
1144
1145 kdc_log(context, config, 0, "Searching referral for %s", name);
1146
1147 return _krb5_get_host_realm_int(context, name, FALSE, realms) == 0;
1148 }
1149
1150 static krb5_error_code
1151 tgs_parse_request(krb5_context context,
1152 krb5_kdc_configuration *config,
1153 KDC_REQ_BODY *b,
1154 const PA_DATA *tgs_req,
1155 hdb_entry_ex **krbtgt,
1156 krb5_enctype *krbtgt_etype,
1157 krb5_ticket **ticket,
1158 const char **e_text,
1159 const char *from,
1160 const struct sockaddr *from_addr,
1161 time_t **csec,
1162 int **cusec,
1163 AuthorizationData **auth_data,
1164 krb5_keyblock **replykey,
1165 int *rk_is_subkey)
1166 {
1167 static char failed[] = "<unparse_name failed>";
1168 krb5_ap_req ap_req;
1169 krb5_error_code ret;
1170 krb5_principal princ;
1171 krb5_auth_context ac = NULL;
1172 krb5_flags ap_req_options;
1173 krb5_flags verify_ap_req_flags;
1174 krb5_crypto crypto;
1175 krb5uint32 krbtgt_kvno; /* kvno used for the PA-TGS-REQ AP-REQ Ticket */
1176 krb5uint32 krbtgt_kvno_try;
1177 int kvno_search_tries = 4; /* number of kvnos to try when tkt_vno == 0 */
1178 const Keys *krbtgt_keys;/* keyset for TGT tkt_vno */
1179 Key *tkey;
1180 krb5_keyblock *subkey = NULL;
1181 unsigned usage;
1182
1183 *auth_data = NULL;
1184 *csec = NULL;
1185 *cusec = NULL;
1186 *replykey = NULL;
1187
1188 memset(&ap_req, 0, sizeof(ap_req));
1189 ret = krb5_decode_ap_req(context, &tgs_req->padata_value, &ap_req);
1190 if(ret){
1191 const char *msg = krb5_get_error_message(context, ret);
1192 kdc_log(context, config, 0, "Failed to decode AP-REQ: %s", msg);
1193 krb5_free_error_message(context, msg);
1194 goto out;
1195 }
1196
1197 if(!get_krbtgt_realm(&ap_req.ticket.sname)){
1198 /* XXX check for ticket.sname == req.sname */
1199 kdc_log(context, config, 0, "PA-DATA is not a ticket-granting ticket");
1200 ret = KRB5KDC_ERR_POLICY; /* ? */
1201 goto out;
1202 }
1203
1204 _krb5_principalname2krb5_principal(context,
1205 &princ,
1206 ap_req.ticket.sname,
1207 ap_req.ticket.realm);
1208
1209 krbtgt_kvno = ap_req.ticket.enc_part.kvno ? *ap_req.ticket.enc_part.kvno : 0;
1210 ret = _kdc_db_fetch(context, config, princ, HDB_F_GET_KRBTGT,
1211 &krbtgt_kvno, NULL, krbtgt);
1212
1213 if (ret == HDB_ERR_NOT_FOUND_HERE) {
1214 /* XXX Factor out this unparsing of the same princ all over */
1215 char *p;
1216 ret = krb5_unparse_name(context, princ, &p);
1217 if (ret != 0)
1218 p = failed;
1219 krb5_free_principal(context, princ);
1220 kdc_log(context, config, 5,
1221 "Ticket-granting ticket account %s does not have secrets at "
1222 "this KDC, need to proxy", p);
1223 if (ret == 0)
1224 free(p);
1225 ret = HDB_ERR_NOT_FOUND_HERE;
1226 goto out;
1227 } else if (ret == HDB_ERR_KVNO_NOT_FOUND) {
1228 char *p;
1229 ret = krb5_unparse_name(context, princ, &p);
1230 if (ret != 0)
1231 p = failed;
1232 krb5_free_principal(context, princ);
1233 kdc_log(context, config, 5,
1234 "Ticket-granting ticket account %s does not have keys for "
1235 "kvno %d at this KDC", p, krbtgt_kvno);
1236 if (ret == 0)
1237 free(p);
1238 ret = HDB_ERR_KVNO_NOT_FOUND;
1239 goto out;
1240 } else if (ret == HDB_ERR_NO_MKEY) {
1241 char *p;
1242 ret = krb5_unparse_name(context, princ, &p);
1243 if (ret != 0)
1244 p = failed;
1245 krb5_free_principal(context, princ);
1246 kdc_log(context, config, 5,
1247 "Missing master key for decrypting keys for ticket-granting "
1248 "ticket account %s with kvno %d at this KDC", p, krbtgt_kvno);
1249 if (ret == 0)
1250 free(p);
1251 ret = HDB_ERR_KVNO_NOT_FOUND;
1252 goto out;
1253 } else if (ret) {
1254 const char *msg = krb5_get_error_message(context, ret);
1255 char *p;
1256 ret = krb5_unparse_name(context, princ, &p);
1257 if (ret != 0)
1258 p = failed;
1259 krb5_free_principal(context, princ);
1260 kdc_log(context, config, 0,
1261 "Ticket-granting ticket not found in database: %s", msg);
1262 krb5_free_error_message(context, msg);
1263 if (ret == 0)
1264 free(p);
1265 ret = KRB5KRB_AP_ERR_NOT_US;
1266 goto out;
1267 }
1268
1269 krbtgt_kvno_try = krbtgt_kvno ? krbtgt_kvno : (*krbtgt)->entry.kvno;
1270 *krbtgt_etype = ap_req.ticket.enc_part.etype;
1271
1272 next_kvno:
1273 krbtgt_keys = hdb_kvno2keys(context, &(*krbtgt)->entry, krbtgt_kvno_try);
1274 ret = hdb_enctype2key(context, &(*krbtgt)->entry, krbtgt_keys,
1275 ap_req.ticket.enc_part.etype, &tkey);
1276 if (ret && krbtgt_kvno == 0 && kvno_search_tries > 0) {
1277 kvno_search_tries--;
1278 krbtgt_kvno_try--;
1279 goto next_kvno;
1280 } else if (ret) {
1281 char *str = NULL, *p = NULL;
1282
1283 krb5_enctype_to_string(context, ap_req.ticket.enc_part.etype, &str);
1284 krb5_unparse_name(context, princ, &p);
1285 kdc_log(context, config, 0,
1286 "No server key with enctype %s found for %s",
1287 str ? str : "<unknown enctype>",
1288 p ? p : "<unparse_name failed>");
1289 free(str);
1290 free(p);
1291 ret = KRB5KRB_AP_ERR_BADKEYVER;
1292 goto out;
1293 }
1294
1295 if (b->kdc_options.validate)
1296 verify_ap_req_flags = KRB5_VERIFY_AP_REQ_IGNORE_INVALID;
1297 else
1298 verify_ap_req_flags = 0;
1299
1300 ret = krb5_verify_ap_req2(context,
1301 &ac,
1302 &ap_req,
1303 princ,
1304 &tkey->key,
1305 verify_ap_req_flags,
1306 &ap_req_options,
1307 ticket,
1308 KRB5_KU_TGS_REQ_AUTH);
1309 if (ret == KRB5KRB_AP_ERR_BAD_INTEGRITY && kvno_search_tries > 0) {
1310 kvno_search_tries--;
1311 krbtgt_kvno_try--;
1312 goto next_kvno;
1313 }
1314
1315 krb5_free_principal(context, princ);
1316 if(ret) {
1317 const char *msg = krb5_get_error_message(context, ret);
1318 kdc_log(context, config, 0, "Failed to verify AP-REQ: %s", msg);
1319 krb5_free_error_message(context, msg);
1320 goto out;
1321 }
1322
1323 {
1324 krb5_authenticator auth;
1325
1326 ret = krb5_auth_con_getauthenticator(context, ac, &auth);
1327 if (ret == 0) {
1328 *csec = malloc(sizeof(**csec));
1329 if (*csec == NULL) {
1330 krb5_free_authenticator(context, &auth);
1331 kdc_log(context, config, 0, "malloc failed");
1332 goto out;
1333 }
1334 **csec = auth->ctime;
1335 *cusec = malloc(sizeof(**cusec));
1336 if (*cusec == NULL) {
1337 krb5_free_authenticator(context, &auth);
1338 kdc_log(context, config, 0, "malloc failed");
1339 goto out;
1340 }
1341 **cusec = auth->cusec;
1342 krb5_free_authenticator(context, &auth);
1343 }
1344 }
1345
1346 ret = tgs_check_authenticator(context, config,
1347 ac, b, e_text, &(*ticket)->ticket.key);
1348 if (ret) {
1349 krb5_auth_con_free(context, ac);
1350 goto out;
1351 }
1352
1353 usage = KRB5_KU_TGS_REQ_AUTH_DAT_SUBKEY;
1354 *rk_is_subkey = 1;
1355
1356 ret = krb5_auth_con_getremotesubkey(context, ac, &subkey);
1357 if(ret){
1358 const char *msg = krb5_get_error_message(context, ret);
1359 krb5_auth_con_free(context, ac);
1360 kdc_log(context, config, 0, "Failed to get remote subkey: %s", msg);
1361 krb5_free_error_message(context, msg);
1362 goto out;
1363 }
1364 if(subkey == NULL){
1365 usage = KRB5_KU_TGS_REQ_AUTH_DAT_SESSION;
1366 *rk_is_subkey = 0;
1367
1368 ret = krb5_auth_con_getkey(context, ac, &subkey);
1369 if(ret) {
1370 const char *msg = krb5_get_error_message(context, ret);
1371 krb5_auth_con_free(context, ac);
1372 kdc_log(context, config, 0, "Failed to get session key: %s", msg);
1373 krb5_free_error_message(context, msg);
1374 goto out;
1375 }
1376 }
1377 if(subkey == NULL){
1378 krb5_auth_con_free(context, ac);
1379 kdc_log(context, config, 0,
1380 "Failed to get key for enc-authorization-data");
1381 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; /* ? */
1382 goto out;
1383 }
1384
1385 *replykey = subkey;
1386
1387 if (b->enc_authorization_data) {
1388 krb5_data ad;
1389
1390 ret = krb5_crypto_init(context, subkey, 0, &crypto);
1391 if (ret) {
1392 const char *msg = krb5_get_error_message(context, ret);
1393 krb5_auth_con_free(context, ac);
1394 kdc_log(context, config, 0, "krb5_crypto_init failed: %s", msg);
1395 krb5_free_error_message(context, msg);
1396 goto out;
1397 }
1398 ret = krb5_decrypt_EncryptedData (context,
1399 crypto,
1400 usage,
1401 b->enc_authorization_data,
1402 &ad);
1403 krb5_crypto_destroy(context, crypto);
1404 if(ret){
1405 krb5_auth_con_free(context, ac);
1406 kdc_log(context, config, 0,
1407 "Failed to decrypt enc-authorization-data");
1408 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; /* ? */
1409 goto out;
1410 }
1411 ALLOC(*auth_data);
1412 if (*auth_data == NULL) {
1413 krb5_auth_con_free(context, ac);
1414 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; /* ? */
1415 goto out;
1416 }
1417 ret = decode_AuthorizationData(ad.data, ad.length, *auth_data, NULL);
1418 if(ret){
1419 krb5_auth_con_free(context, ac);
1420 free(*auth_data);
1421 *auth_data = NULL;
1422 kdc_log(context, config, 0, "Failed to decode authorization data");
1423 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; /* ? */
1424 goto out;
1425 }
1426 }
1427
1428 krb5_auth_con_free(context, ac);
1429
1430 out:
1431 free_AP_REQ(&ap_req);
1432
1433 return ret;
1434 }
1435
1436 static krb5_error_code
1437 build_server_referral(krb5_context context,
1438 krb5_kdc_configuration *config,
1439 krb5_crypto session,
1440 krb5_const_realm referred_realm,
1441 const PrincipalName *true_principal_name,
1442 const PrincipalName *requested_principal,
1443 krb5_data *outdata)
1444 {
1445 PA_ServerReferralData ref;
1446 krb5_error_code ret;
1447 EncryptedData ed;
1448 krb5_data data;
1449 size_t size = 0;
1450
1451 memset(&ref, 0, sizeof(ref));
1452
1453 if (referred_realm) {
1454 ALLOC(ref.referred_realm);
1455 if (ref.referred_realm == NULL)
1456 goto eout;
1457 *ref.referred_realm = strdup(referred_realm);
1458 if (*ref.referred_realm == NULL)
1459 goto eout;
1460 }
1461 if (true_principal_name) {
1462 ALLOC(ref.true_principal_name);
1463 if (ref.true_principal_name == NULL)
1464 goto eout;
1465 ret = copy_PrincipalName(true_principal_name, ref.true_principal_name);
1466 if (ret)
1467 goto eout;
1468 }
1469 if (requested_principal) {
1470 ALLOC(ref.requested_principal_name);
1471 if (ref.requested_principal_name == NULL)
1472 goto eout;
1473 ret = copy_PrincipalName(requested_principal,
1474 ref.requested_principal_name);
1475 if (ret)
1476 goto eout;
1477 }
1478
1479 ASN1_MALLOC_ENCODE(PA_ServerReferralData,
1480 data.data, data.length,
1481 &ref, &size, ret);
1482 free_PA_ServerReferralData(&ref);
1483 if (ret)
1484 return ret;
1485 if (data.length != size)
1486 krb5_abortx(context, "internal asn.1 encoder error");
1487
1488 ret = krb5_encrypt_EncryptedData(context, session,
1489 KRB5_KU_PA_SERVER_REFERRAL,
1490 data.data, data.length,
1491 0 /* kvno */, &ed);
1492 free(data.data);
1493 if (ret)
1494 return ret;
1495
1496 ASN1_MALLOC_ENCODE(EncryptedData,
1497 outdata->data, outdata->length,
1498 &ed, &size, ret);
1499 free_EncryptedData(&ed);
1500 if (ret)
1501 return ret;
1502 if (outdata->length != size)
1503 krb5_abortx(context, "internal asn.1 encoder error");
1504
1505 return 0;
1506 eout:
1507 free_PA_ServerReferralData(&ref);
1508 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
1509 return ENOMEM;
1510 }
1511
1512 static krb5_error_code
1513 tgs_build_reply(krb5_context context,
1514 krb5_kdc_configuration *config,
1515 KDC_REQ *req,
1516 KDC_REQ_BODY *b,
1517 hdb_entry_ex *krbtgt,
1518 krb5_enctype krbtgt_etype,
1519 const krb5_keyblock *replykey,
1520 int rk_is_subkey,
1521 krb5_ticket *ticket,
1522 krb5_data *reply,
1523 const char *from,
1524 const char **e_text,
1525 AuthorizationData **auth_data,
1526 const struct sockaddr *from_addr)
1527 {
1528 krb5_error_code ret;
1529 krb5_principal cp = NULL, sp = NULL, rsp = NULL, tp = NULL, dp = NULL;
1530 krb5_principal krbtgt_out_principal = NULL;
1531 char *spn = NULL, *cpn = NULL, *tpn = NULL, *dpn = NULL, *krbtgt_out_n = NULL;
1532 hdb_entry_ex *server = NULL, *client = NULL, *s4u2self_impersonated_client = NULL;
1533 HDB *clientdb, *s4u2self_impersonated_clientdb;
1534 krb5_realm ref_realm = NULL;
1535 EncTicketPart *tgt = &ticket->ticket;
1536 krb5_principals spp = NULL;
1537 const EncryptionKey *ekey;
1538 krb5_keyblock sessionkey;
1539 krb5_kvno kvno;
1540 krb5_data rspac;
1541
1542 hdb_entry_ex *krbtgt_out = NULL;
1543
1544 METHOD_DATA enc_pa_data;
1545
1546 PrincipalName *s;
1547 Realm r;
1548 int nloop = 0;
1549 EncTicketPart adtkt;
1550 char opt_str[128];
1551 int signedpath = 0;
1552
1553 Key *tkey_check;
1554 Key *tkey_sign;
1555 int flags = HDB_F_FOR_TGS_REQ;
1556
1557 memset(&sessionkey, 0, sizeof(sessionkey));
1558 memset(&adtkt, 0, sizeof(adtkt));
1559 krb5_data_zero(&rspac);
1560 memset(&enc_pa_data, 0, sizeof(enc_pa_data));
1561
1562 s = b->sname;
1563 r = b->realm;
1564
1565 /*
1566 * Always to do CANON, see comment below about returned server principal (rsp).
1567 */
1568 flags |= HDB_F_CANON;
1569
1570 if(b->kdc_options.enc_tkt_in_skey){
1571 Ticket *t;
1572 hdb_entry_ex *uu;
1573 krb5_principal p;
1574 Key *uukey;
1575
1576 if(b->additional_tickets == NULL ||
1577 b->additional_tickets->len == 0){
1578 ret = KRB5KDC_ERR_BADOPTION; /* ? */
1579 kdc_log(context, config, 0,
1580 "No second ticket present in request");
1581 goto out;
1582 }
1583 t = &b->additional_tickets->val[0];
1584 if(!get_krbtgt_realm(&t->sname)){
1585 kdc_log(context, config, 0,
1586 "Additional ticket is not a ticket-granting ticket");
1587 ret = KRB5KDC_ERR_POLICY;
1588 goto out;
1589 }
1590 _krb5_principalname2krb5_principal(context, &p, t->sname, t->realm);
1591 ret = _kdc_db_fetch(context, config, p,
1592 HDB_F_GET_KRBTGT, t->enc_part.kvno,
1593 NULL, &uu);
1594 krb5_free_principal(context, p);
1595 if(ret){
1596 if (ret == HDB_ERR_NOENTRY)
1597 ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
1598 goto out;
1599 }
1600 ret = hdb_enctype2key(context, &uu->entry, NULL,
1601 t->enc_part.etype, &uukey);
1602 if(ret){
1603 _kdc_free_ent(context, uu);
1604 ret = KRB5KDC_ERR_ETYPE_NOSUPP; /* XXX */
1605 goto out;
1606 }
1607 ret = krb5_decrypt_ticket(context, t, &uukey->key, &adtkt, 0);
1608 _kdc_free_ent(context, uu);
1609 if(ret)
1610 goto out;
1611
1612 ret = verify_flags(context, config, &adtkt, spn);
1613 if (ret)
1614 goto out;
1615
1616 s = &adtkt.cname;
1617 r = adtkt.crealm;
1618 }
1619
1620 _krb5_principalname2krb5_principal(context, &sp, *s, r);
1621 ret = krb5_unparse_name(context, sp, &spn);
1622 if (ret)
1623 goto out;
1624 _krb5_principalname2krb5_principal(context, &cp, tgt->cname, tgt->crealm);
1625 ret = krb5_unparse_name(context, cp, &cpn);
1626 if (ret)
1627 goto out;
1628 unparse_flags (KDCOptions2int(b->kdc_options),
1629 asn1_KDCOptions_units(),
1630 opt_str, sizeof(opt_str));
1631 if(*opt_str)
1632 kdc_log(context, config, 0,
1633 "TGS-REQ %s from %s for %s [%s]",
1634 cpn, from, spn, opt_str);
1635 else
1636 kdc_log(context, config, 0,
1637 "TGS-REQ %s from %s for %s", cpn, from, spn);
1638
1639 /*
1640 * Fetch server
1641 */
1642
1643 server_lookup:
1644 ret = _kdc_db_fetch(context, config, sp, HDB_F_GET_SERVER | flags,
1645 NULL, NULL, &server);
1646
1647 if(ret == HDB_ERR_NOT_FOUND_HERE) {
1648 kdc_log(context, config, 5, "target %s does not have secrets at this KDC, need to proxy", sp);
1649 goto out;
1650 } else if (ret == HDB_ERR_WRONG_REALM) {
1651 if (ref_realm)
1652 free(ref_realm);
1653 ref_realm = strdup(server->entry.principal->realm);
1654 if (ref_realm == NULL) {
1655 ret = ENOMEM;
1656 goto out;
1657 }
1658
1659 kdc_log(context, config, 5,
1660 "Returning a referral to realm %s for "
1661 "server %s.",
1662 ref_realm, spn);
1663 krb5_free_principal(context, sp);
1664 sp = NULL;
1665 free(spn);
1666 spn = NULL;
1667 ret = krb5_make_principal(context, &sp, r, KRB5_TGS_NAME,
1668 ref_realm, NULL);
1669 if (ret)
1670 goto out;
1671 ret = krb5_unparse_name(context, sp, &spn);
1672 if (ret)
1673 goto out;
1674
1675 goto server_lookup;
1676 } else if(ret){
1677 const char *new_rlm, *msg;
1678 Realm req_rlm;
1679 krb5_realm *realms;
1680
1681 if ((req_rlm = get_krbtgt_realm(&sp->name)) != NULL) {
1682 if(nloop++ < 2) {
1683 new_rlm = find_rpath(context, tgt->crealm, req_rlm);
1684 if(new_rlm) {
1685 kdc_log(context, config, 5, "krbtgt for realm %s "
1686 "not found, trying %s",
1687 req_rlm, new_rlm);
1688 krb5_free_principal(context, sp);
1689 free(spn);
1690 krb5_make_principal(context, &sp, r,
1691 KRB5_TGS_NAME, new_rlm, NULL);
1692 ret = krb5_unparse_name(context, sp, &spn);
1693 if (ret)
1694 goto out;
1695
1696 if (ref_realm)
1697 free(ref_realm);
1698 ref_realm = strdup(new_rlm);
1699 goto server_lookup;
1700 }
1701 }
1702 } else if(need_referral(context, config, &b->kdc_options, sp, &realms)) {
1703 if (strcmp(realms[0], sp->realm) != 0) {
1704 kdc_log(context, config, 5,
1705 "Returning a referral to realm %s for "
1706 "server %s that was not found",
1707 realms[0], spn);
1708 krb5_free_principal(context, sp);
1709 free(spn);
1710 krb5_make_principal(context, &sp, r, KRB5_TGS_NAME,
1711 realms[0], NULL);
1712 ret = krb5_unparse_name(context, sp, &spn);
1713 if (ret)
1714 goto out;
1715
1716 if (ref_realm)
1717 free(ref_realm);
1718 ref_realm = strdup(realms[0]);
1719
1720 krb5_free_host_realm(context, realms);
1721 goto server_lookup;
1722 }
1723 krb5_free_host_realm(context, realms);
1724 }
1725 msg = krb5_get_error_message(context, ret);
1726 kdc_log(context, config, 0,
1727 "Server not found in database: %s: %s", spn, msg);
1728 krb5_free_error_message(context, msg);
1729 if (ret == HDB_ERR_NOENTRY)
1730 ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
1731 goto out;
1732 }
1733
1734 /* the name returned to the client depend on what was asked for,
1735 * return canonical name if kdc_options.canonicalize was set, the
1736 * client wants the true name of the principal, if not it just
1737 * wants the name its asked for.
1738 */
1739
1740 if (b->kdc_options.canonicalize)
1741 rsp = server->entry.principal;
1742 else
1743 rsp = sp;
1744
1745
1746 /*
1747 * Select enctype, return key and kvno.
1748 */
1749
1750 {
1751 krb5_enctype etype;
1752
1753 if(b->kdc_options.enc_tkt_in_skey) {
1754 size_t i;
1755 ekey = &adtkt.key;
1756 for(i = 0; i < b->etype.len; i++)
1757 if (b->etype.val[i] == adtkt.key.keytype)
1758 break;
1759 if(i == b->etype.len) {
1760 kdc_log(context, config, 0,
1761 "Addition ticket have not matching etypes");
1762 krb5_clear_error_message(context);
1763 ret = KRB5KDC_ERR_ETYPE_NOSUPP;
1764 goto out;
1765 }
1766 etype = b->etype.val[i];
1767 kvno = 0;
1768 } else {
1769 Key *skey;
1770
1771 ret = _kdc_find_etype(context,
1772 krb5_principal_is_krbtgt(context, sp) ?
1773 config->tgt_use_strongest_session_key :
1774 config->svc_use_strongest_session_key, FALSE,
1775 server, b->etype.val, b->etype.len, &etype,
1776 NULL);
1777 if(ret) {
1778 kdc_log(context, config, 0,
1779 "Server (%s) has no support for etypes", spn);
1780 goto out;
1781 }
1782 ret = _kdc_get_preferred_key(context, config, server, spn,
1783 NULL, &skey);
1784 if(ret) {
1785 kdc_log(context, config, 0,
1786 "Server (%s) has no supported etypes", spn);
1787 goto out;
1788 }
1789 ekey = &skey->key;
1790 kvno = server->entry.kvno;
1791 }
1792
1793 ret = krb5_generate_random_keyblock(context, etype, &sessionkey);
1794 if (ret)
1795 goto out;
1796 }
1797
1798 /*
1799 * Check that service is in the same realm as the krbtgt. If it's
1800 * not the same, it's someone that is using a uni-directional trust
1801 * backward.
1802 */
1803
1804 /*
1805 * Validate authoriation data
1806 */
1807
1808 ret = hdb_enctype2key(context, &krbtgt->entry, NULL, /* XXX use the right kvno! */
1809 krbtgt_etype, &tkey_check);
1810 if(ret) {
1811 kdc_log(context, config, 0,
1812 "Failed to find key for krbtgt PAC check");
1813 goto out;
1814 }
1815
1816 /*
1817 * Now refetch the primary krbtgt, and get the current kvno (the
1818 * sign check may have been on an old kvno, and the server may
1819 * have been an incoming trust)
1820 */
1821
1822 {
1823 const char *remote_realm =
1824 krb5_principal_get_comp_string(context, krbtgt->entry.principal, 1);
1825
1826 ret = krb5_make_principal(context,
1827 &krbtgt_out_principal,
1828 remote_realm,
1829 KRB5_TGS_NAME,
1830 remote_realm,
1831 NULL);
1832 if(ret) {
1833 kdc_log(context, config, 0,
1834 "Failed to make krbtgt principal name object for "
1835 "authz-data signatures");
1836 goto out;
1837 }
1838 ret = krb5_unparse_name(context, krbtgt_out_principal, &krbtgt_out_n);
1839 if (ret) {
1840 kdc_log(context, config, 0,
1841 "Failed to make krbtgt principal name object for "
1842 "authz-data signatures");
1843 goto out;
1844 }
1845 }
1846
1847 ret = _kdc_db_fetch(context, config, krbtgt_out_principal,
1848 HDB_F_GET_KRBTGT, NULL, NULL, &krbtgt_out);
1849 if (ret) {
1850 char *ktpn = NULL;
1851 ret = krb5_unparse_name(context, krbtgt->entry.principal, &ktpn);
1852 kdc_log(context, config, 0,
1853 "No such principal %s (needed for authz-data signature keys) "
1854 "while processing TGS-REQ for service %s with krbtg %s",
1855 krbtgt_out_n, spn, (ret == 0) ? ktpn : "<unknown>");
1856 free(ktpn);
1857 ret = KRB5KRB_AP_ERR_NOT_US;
1858 goto out;
1859 }
1860
1861 /*
1862 * The first realm is the realm of the service, the second is
1863 * krbtgt/<this>/@REALM component of the krbtgt DN the request was
1864 * encrypted to. The redirection via the krbtgt_out entry allows
1865 * the DB to possibly correct the case of the realm (Samba4 does
1866 * this) before the strcmp()
1867 */
1868 if (strcmp(krb5_principal_get_realm(context, server->entry.principal),
1869 krb5_principal_get_realm(context, krbtgt_out->entry.principal)) != 0) {
1870 char *ktpn;
1871 ret = krb5_unparse_name(context, krbtgt_out->entry.principal, &ktpn);
1872 kdc_log(context, config, 0,
1873 "Request with wrong krbtgt: %s",
1874 (ret == 0) ? ktpn : "<unknown>");
1875 if(ret == 0)
1876 free(ktpn);
1877 ret = KRB5KRB_AP_ERR_NOT_US;
1878 goto out;
1879 }
1880
1881 ret = _kdc_get_preferred_key(context, config, krbtgt_out, krbtgt_out_n,
1882 NULL, &tkey_sign);
1883 if (ret) {
1884 kdc_log(context, config, 0,
1885 "Failed to find key for krbtgt PAC signature");
1886 goto out;
1887 }
1888 ret = hdb_enctype2key(context, &krbtgt_out->entry, NULL,
1889 tkey_sign->key.keytype, &tkey_sign);
1890 if(ret) {
1891 kdc_log(context, config, 0,
1892 "Failed to find key for krbtgt PAC signature");
1893 goto out;
1894 }
1895
1896 ret = _kdc_db_fetch(context, config, cp, HDB_F_GET_CLIENT | flags,
1897 NULL, &clientdb, &client);
1898 if(ret == HDB_ERR_NOT_FOUND_HERE) {
1899 /* This is OK, we are just trying to find out if they have
1900 * been disabled or deleted in the meantime, missing secrets
1901 * is OK */
1902 } else if(ret){
1903 const char *krbtgt_realm, *msg;
1904
1905 /*
1906 * If the client belongs to the same realm as our krbtgt, it
1907 * should exist in the local database.
1908 *
1909 */
1910
1911 krbtgt_realm = krb5_principal_get_realm(context, krbtgt_out->entry.principal);
1912
1913 if(strcmp(krb5_principal_get_realm(context, cp), krbtgt_realm) == 0) {
1914 if (ret == HDB_ERR_NOENTRY)
1915 ret = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
1916 kdc_log(context, config, 1, "Client no longer in database: %s",
1917 cpn);
1918 goto out;
1919 }
1920
1921 msg = krb5_get_error_message(context, ret);
1922 kdc_log(context, config, 1, "Client not found in database: %s", msg);
1923 krb5_free_error_message(context, msg);
1924 }
1925
1926 ret = check_PAC(context, config, cp, NULL,
1927 client, server, krbtgt,
1928 &tkey_check->key,
1929 ekey, &tkey_sign->key,
1930 tgt, &rspac, &signedpath);
1931 if (ret) {
1932 const char *msg = krb5_get_error_message(context, ret);
1933 kdc_log(context, config, 0,
1934 "Verify PAC failed for %s (%s) from %s with %s",
1935 spn, cpn, from, msg);
1936 krb5_free_error_message(context, msg);
1937 goto out;
1938 }
1939
1940 /* also check the krbtgt for signature */
1941 ret = check_KRB5SignedPath(context,
1942 config,
1943 krbtgt,
1944 cp,
1945 tgt,
1946 &spp,
1947 &signedpath);
1948 if (ret) {
1949 const char *msg = krb5_get_error_message(context, ret);
1950 kdc_log(context, config, 0,
1951 "KRB5SignedPath check failed for %s (%s) from %s with %s",
1952 spn, cpn, from, msg);
1953 krb5_free_error_message(context, msg);
1954 goto out;
1955 }
1956
1957 /*
1958 * Process request
1959 */
1960
1961 /* by default the tgt principal matches the client principal */
1962 tp = cp;
1963 tpn = cpn;
1964
1965 if (client) {
1966 const PA_DATA *sdata;
1967 int i = 0;
1968
1969 sdata = _kdc_find_padata(req, &i, KRB5_PADATA_FOR_USER);
1970 if (sdata) {
1971 krb5_crypto crypto;
1972 krb5_data datack;
1973 PA_S4U2Self self;
1974 const char *str;
1975
1976 ret = decode_PA_S4U2Self(sdata->padata_value.data,
1977 sdata->padata_value.length,
1978 &self, NULL);
1979 if (ret) {
1980 kdc_log(context, config, 0, "Failed to decode PA-S4U2Self");
1981 goto out;
1982 }
1983
1984 ret = _krb5_s4u2self_to_checksumdata(context, &self, &datack);
1985 if (ret)
1986 goto out;
1987
1988 ret = krb5_crypto_init(context, &tgt->key, 0, &crypto);
1989 if (ret) {
1990 const char *msg = krb5_get_error_message(context, ret);
1991 free_PA_S4U2Self(&self);
1992 krb5_data_free(&datack);
1993 kdc_log(context, config, 0, "krb5_crypto_init failed: %s", msg);
1994 krb5_free_error_message(context, msg);
1995 goto out;
1996 }
1997
1998 ret = krb5_verify_checksum(context,
1999 crypto,
2000 KRB5_KU_OTHER_CKSUM,
2001 datack.data,
2002 datack.length,
2003 &self.cksum);
2004 krb5_data_free(&datack);
2005 krb5_crypto_destroy(context, crypto);
2006 if (ret) {
2007 const char *msg = krb5_get_error_message(context, ret);
2008 free_PA_S4U2Self(&self);
2009 kdc_log(context, config, 0,
2010 "krb5_verify_checksum failed for S4U2Self: %s", msg);
2011 krb5_free_error_message(context, msg);
2012 goto out;
2013 }
2014
2015 ret = _krb5_principalname2krb5_principal(context,
2016 &tp,
2017 self.name,
2018 self.realm);
2019 free_PA_S4U2Self(&self);
2020 if (ret)
2021 goto out;
2022
2023 ret = krb5_unparse_name(context, tp, &tpn);
2024 if (ret)
2025 goto out;
2026
2027 /* If we were about to put a PAC into the ticket, we better fix it to be the right PAC */
2028 if(rspac.data) {
2029 krb5_pac p = NULL;
2030 krb5_data_free(&rspac);
2031 ret = _kdc_db_fetch(context, config, tp, HDB_F_GET_CLIENT | flags,
2032 NULL, &s4u2self_impersonated_clientdb, &s4u2self_impersonated_client);
2033 if (ret) {
2034 const char *msg;
2035
2036 /*
2037 * If the client belongs to the same realm as our krbtgt, it
2038 * should exist in the local database.
2039 *
2040 */
2041
2042 if (ret == HDB_ERR_NOENTRY)
2043 ret = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
2044 msg = krb5_get_error_message(context, ret);
2045 kdc_log(context, config, 1,
2046 "S2U4Self principal to impersonate %s not found in database: %s",
2047 tpn, msg);
2048 krb5_free_error_message(context, msg);
2049 goto out;
2050 }
2051 ret = _kdc_pac_generate(context, s4u2self_impersonated_client, &p);
2052 if (ret) {
2053 kdc_log(context, config, 0, "PAC generation failed for -- %s",
2054 tpn);
2055 goto out;
2056 }
2057 if (p != NULL) {
2058 ret = _krb5_pac_sign(context, p, ticket->ticket.authtime,
2059 s4u2self_impersonated_client->entry.principal,
2060 ekey, &tkey_sign->key,
2061 &rspac);
2062 krb5_pac_free(context, p);
2063 if (ret) {
2064 kdc_log(context, config, 0, "PAC signing failed for -- %s",
2065 tpn);
2066 goto out;
2067 }
2068 }
2069 }
2070
2071 /*
2072 * Check that service doing the impersonating is
2073 * requesting a ticket to it-self.
2074 */
2075 ret = check_s4u2self(context, config, clientdb, client, sp);
2076 if (ret) {
2077 kdc_log(context, config, 0, "S4U2Self: %s is not allowed "
2078 "to impersonate to service "
2079 "(tried for user %s to service %s)",
2080 cpn, tpn, spn);
2081 goto out;
2082 }
2083
2084 /*
2085 * If the service isn't trusted for authentication to
2086 * delegation, remove the forward flag.
2087 */
2088
2089 if (client->entry.flags.trusted_for_delegation) {
2090 str = "[forwardable]";
2091 } else {
2092 b->kdc_options.forwardable = 0;
2093 str = "";
2094 }
2095 kdc_log(context, config, 0, "s4u2self %s impersonating %s to "
2096 "service %s %s", cpn, tpn, spn, str);
2097 }
2098 }
2099
2100 /*
2101 * Constrained delegation
2102 */
2103
2104 if (client != NULL
2105 && b->additional_tickets != NULL
2106 && b->additional_tickets->len != 0
2107 && b->kdc_options.enc_tkt_in_skey == 0)
2108 {
2109 int ad_signedpath = 0;
2110 Key *clientkey;
2111 Ticket *t;
2112
2113 /*
2114 * Require that the KDC have issued the service's krbtgt (not
2115 * self-issued ticket with kimpersonate(1).
2116 */
2117 if (!signedpath) {
2118 ret = KRB5KDC_ERR_BADOPTION;
2119 kdc_log(context, config, 0,
2120 "Constrained delegation done on service ticket %s/%s",
2121 cpn, spn);
2122 goto out;
2123 }
2124
2125 t = &b->additional_tickets->val[0];
2126
2127 ret = hdb_enctype2key(context, &client->entry,
2128 hdb_kvno2keys(context, &client->entry,
2129 t->enc_part.kvno ? * t->enc_part.kvno : 0),
2130 t->enc_part.etype, &clientkey);
2131 if(ret){
2132 ret = KRB5KDC_ERR_ETYPE_NOSUPP; /* XXX */
2133 goto out;
2134 }
2135
2136 ret = krb5_decrypt_ticket(context, t, &clientkey->key, &adtkt, 0);
2137 if (ret) {
2138 kdc_log(context, config, 0,
2139 "failed to decrypt ticket for "
2140 "constrained delegation from %s to %s ", cpn, spn);
2141 goto out;
2142 }
2143
2144 ret = _krb5_principalname2krb5_principal(context,
2145 &tp,
2146 adtkt.cname,
2147 adtkt.crealm);
2148 if (ret)
2149 goto out;
2150
2151 ret = krb5_unparse_name(context, tp, &tpn);
2152 if (ret)
2153 goto out;
2154
2155 ret = _krb5_principalname2krb5_principal(context,
2156 &dp,
2157 t->sname,
2158 t->realm);
2159 if (ret)
2160 goto out;
2161
2162 ret = krb5_unparse_name(context, dp, &dpn);
2163 if (ret)
2164 goto out;
2165
2166 /* check that ticket is valid */
2167 if (adtkt.flags.forwardable == 0) {
2168 kdc_log(context, config, 0,
2169 "Missing forwardable flag on ticket for "
2170 "constrained delegation from %s (%s) as %s to %s ",
2171 cpn, dpn, tpn, spn);
2172 ret = KRB5KDC_ERR_BADOPTION;
2173 goto out;
2174 }
2175
2176 ret = check_constrained_delegation(context, config, clientdb,
2177 client, server, sp);
2178 if (ret) {
2179 kdc_log(context, config, 0,
2180 "constrained delegation from %s (%s) as %s to %s not allowed",
2181 cpn, dpn, tpn, spn);
2182 goto out;
2183 }
2184
2185 ret = verify_flags(context, config, &adtkt, tpn);
2186 if (ret) {
2187 goto out;
2188 }
2189
2190 krb5_data_free(&rspac);
2191
2192 /*
2193 * generate the PAC for the user.
2194 *
2195 * TODO: pass in t->sname and t->realm and build
2196 * a S4U_DELEGATION_INFO blob to the PAC.
2197 */
2198 ret = check_PAC(context, config, tp, dp,
2199 client, server, krbtgt,
2200 &clientkey->key,
2201 ekey, &tkey_sign->key,
2202 &adtkt, &rspac, &ad_signedpath);
2203 if (ret) {
2204 const char *msg = krb5_get_error_message(context, ret);
2205 kdc_log(context, config, 0,
2206 "Verify delegated PAC failed to %s for client"
2207 "%s (%s) as %s from %s with %s",
2208 spn, cpn, dpn, tpn, from, msg);
2209 krb5_free_error_message(context, msg);
2210 goto out;
2211 }
2212
2213 /*
2214 * Check that the KDC issued the user's ticket.
2215 */
2216 ret = check_KRB5SignedPath(context,
2217 config,
2218 krbtgt,
2219 cp,
2220 &adtkt,
2221 NULL,
2222 &ad_signedpath);
2223 if (ret) {
2224 const char *msg = krb5_get_error_message(context, ret);
2225 kdc_log(context, config, 0,
2226 "KRB5SignedPath check from service %s failed "
2227 "for delegation to %s for client %s (%s)"
2228 "from %s failed with %s",
2229 spn, tpn, dpn, cpn, from, msg);
2230 krb5_free_error_message(context, msg);
2231 goto out;
2232 }
2233
2234 if (!ad_signedpath) {
2235 ret = KRB5KDC_ERR_BADOPTION;
2236 kdc_log(context, config, 0,
2237 "Ticket not signed with PAC nor SignedPath service %s failed "
2238 "for delegation to %s for client %s (%s)"
2239 "from %s",
2240 spn, tpn, dpn, cpn, from);
2241 goto out;
2242 }
2243
2244 kdc_log(context, config, 0, "constrained delegation for %s "
2245 "from %s (%s) to %s", tpn, cpn, dpn, spn);
2246 }
2247
2248 /*
2249 * Check flags
2250 */
2251
2252 ret = kdc_check_flags(context, config,
2253 client, cpn,
2254 server, spn,
2255 FALSE);
2256 if(ret)
2257 goto out;
2258
2259 if((b->kdc_options.validate || b->kdc_options.renew) &&
2260 !krb5_principal_compare(context,
2261 krbtgt->entry.principal,
2262 server->entry.principal)){
2263 kdc_log(context, config, 0, "Inconsistent request.");
2264 ret = KRB5KDC_ERR_SERVER_NOMATCH;
2265 goto out;
2266 }
2267
2268 /* check for valid set of addresses */
2269 if(!_kdc_check_addresses(context, config, tgt->caddr, from_addr)) {
2270 ret = KRB5KRB_AP_ERR_BADADDR;
2271 kdc_log(context, config, 0, "Request from wrong address");
2272 goto out;
2273 }
2274
2275 /*
2276 * If this is an referral, add server referral data to the
2277 * auth_data reply .
2278 */
2279 if (ref_realm) {
2280 PA_DATA pa;
2281 krb5_crypto crypto;
2282
2283 kdc_log(context, config, 0,
2284 "Adding server referral to %s", ref_realm);
2285
2286 ret = krb5_crypto_init(context, &sessionkey, 0, &crypto);
2287 if (ret)
2288 goto out;
2289
2290 ret = build_server_referral(context, config, crypto, ref_realm,
2291 NULL, s, &pa.padata_value);
2292 krb5_crypto_destroy(context, crypto);
2293 if (ret) {
2294 kdc_log(context, config, 0,
2295 "Failed building server referral");
2296 goto out;
2297 }
2298 pa.padata_type = KRB5_PADATA_SERVER_REFERRAL;
2299
2300 ret = add_METHOD_DATA(&enc_pa_data, &pa);
2301 krb5_data_free(&pa.padata_value);
2302 if (ret) {
2303 kdc_log(context, config, 0,
2304 "Add server referral METHOD-DATA failed");
2305 goto out;
2306 }
2307 }
2308
2309 /*
2310 *
2311 */
2312
2313 ret = tgs_make_reply(context,
2314 config,
2315 b,
2316 tp,
2317 tgt,
2318 replykey,
2319 rk_is_subkey,
2320 ekey,
2321 &sessionkey,
2322 kvno,
2323 *auth_data,
2324 server,
2325 rsp,
2326 spn,
2327 client,
2328 cp,
2329 krbtgt_out,
2330 tkey_sign->key.keytype,
2331 spp,
2332 &rspac,
2333 &enc_pa_data,
2334 e_text,
2335 reply);
2336
2337 out:
2338 if (tpn != cpn)
2339 free(tpn);
2340 free(spn);
2341 free(cpn);
2342 free(dpn);
2343 free(krbtgt_out_n);
2344
2345 krb5_data_free(&rspac);
2346 krb5_free_keyblock_contents(context, &sessionkey);
2347 if(krbtgt_out)
2348 _kdc_free_ent(context, krbtgt_out);
2349 if(server)
2350 _kdc_free_ent(context, server);
2351 if(client)
2352 _kdc_free_ent(context, client);
2353 if(s4u2self_impersonated_client)
2354 _kdc_free_ent(context, s4u2self_impersonated_client);
2355
2356 if (tp && tp != cp)
2357 krb5_free_principal(context, tp);
2358 krb5_free_principal(context, cp);
2359 krb5_free_principal(context, dp);
2360 krb5_free_principal(context, sp);
2361 krb5_free_principal(context, krbtgt_out_principal);
2362 if (ref_realm)
2363 free(ref_realm);
2364 free_METHOD_DATA(&enc_pa_data);
2365
2366 free_EncTicketPart(&adtkt);
2367
2368 return ret;
2369 }
2370
2371 /*
2372 *
2373 */
2374
2375 krb5_error_code
2376 _kdc_tgs_rep(krb5_context context,
2377 krb5_kdc_configuration *config,
2378 KDC_REQ *req,
2379 krb5_data *data,
2380 const char *from,
2381 struct sockaddr *from_addr,
2382 int datagram_reply)
2383 {
2384 AuthorizationData *auth_data = NULL;
2385 krb5_error_code ret;
2386 int i = 0;
2387 const PA_DATA *tgs_req;
2388
2389 hdb_entry_ex *krbtgt = NULL;
2390 krb5_ticket *ticket = NULL;
2391 const char *e_text = NULL;
2392 krb5_enctype krbtgt_etype = ETYPE_NULL;
2393
2394 krb5_keyblock *replykey = NULL;
2395 int rk_is_subkey = 0;
2396 time_t *csec = NULL;
2397 int *cusec = NULL;
2398
2399 if(req->padata == NULL){
2400 ret = KRB5KDC_ERR_PREAUTH_REQUIRED; /* XXX ??? */
2401 kdc_log(context, config, 0,
2402 "TGS-REQ from %s without PA-DATA", from);
2403 goto out;
2404 }
2405
2406 tgs_req = _kdc_find_padata(req, &i, KRB5_PADATA_TGS_REQ);
2407
2408 if(tgs_req == NULL){
2409 ret = KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
2410
2411 kdc_log(context, config, 0,
2412 "TGS-REQ from %s without PA-TGS-REQ", from);
2413 goto out;
2414 }
2415 ret = tgs_parse_request(context, config,
2416 &req->req_body, tgs_req,
2417 &krbtgt,
2418 &krbtgt_etype,
2419 &ticket,
2420 &e_text,
2421 from, from_addr,
2422 &csec, &cusec,
2423 &auth_data,
2424 &replykey,
2425 &rk_is_subkey);
2426 if (ret == HDB_ERR_NOT_FOUND_HERE) {
2427 /* kdc_log() is called in tgs_parse_request() */
2428 goto out;
2429 }
2430 if (ret) {
2431 kdc_log(context, config, 0,
2432 "Failed parsing TGS-REQ from %s", from);
2433 goto out;
2434 }
2435
2436 {
2437 const PA_DATA *pa = _kdc_find_padata(req, &i, KRB5_PADATA_FX_FAST);
2438 if (pa)
2439 kdc_log(context, config, 10, "Got TGS FAST request");
2440 }
2441
2442
2443 ret = tgs_build_reply(context,
2444 config,
2445 req,
2446 &req->req_body,
2447 krbtgt,
2448 krbtgt_etype,
2449 replykey,
2450 rk_is_subkey,
2451 ticket,
2452 data,
2453 from,
2454 &e_text,
2455 &auth_data,
2456 from_addr);
2457 if (ret) {
2458 kdc_log(context, config, 0,
2459 "Failed building TGS-REP to %s", from);
2460 goto out;
2461 }
2462
2463 /* */
2464 if (datagram_reply && data->length > config->max_datagram_reply_length) {
2465 krb5_data_free(data);
2466 ret = KRB5KRB_ERR_RESPONSE_TOO_BIG;
2467 e_text = "Reply packet too large";
2468 }
2469
2470 out:
2471 if (replykey)
2472 krb5_free_keyblock(context, replykey);
2473
2474 if(ret && ret != HDB_ERR_NOT_FOUND_HERE && data->data == NULL){
2475 /* XXX add fast wrapping on the error */
2476 METHOD_DATA error_method = { 0, NULL };
2477
2478
2479 kdc_log(context, config, 10, "tgs-req: sending error: %d to client", ret);
2480 ret = _kdc_fast_mk_error(context, NULL,
2481 &error_method,
2482 NULL,
2483 NULL,
2484 ret, NULL,
2485 NULL,
2486 NULL, NULL,
2487 csec, cusec,
2488 data);
2489 free_METHOD_DATA(&error_method);
2490 }
2491 free(csec);
2492 free(cusec);
2493 if (ticket)
2494 krb5_free_ticket(context, ticket);
2495 if(krbtgt)
2496 _kdc_free_ent(context, krbtgt);
2497
2498 if (auth_data) {
2499 free_AuthorizationData(auth_data);
2500 free(auth_data);
2501 }
2502
2503 return ret;
2504 }
Heimdal