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s3: smbd: vfs_fruit: Replace code in fruit_fget_nt_acl() with remove_virtual_nfs_aces().
[Samba.git] / source4 / kdc / mit_samba.c
blob1cd6750f5ab76d097054227991976b58c2ed7485
1 /*
2 MIT-Samba4 library
3
4 Copyright (c) 2010, Simo Sorce <idra@samba.org>
5 Copyright (c) 2014-2015 Guenther Deschner <gd@samba.org>
6 Copyright (c) 2014-2016 Andreas Schneider <asn@samba.org>
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #define TEVENT_DEPRECATED 1
23
24 #include "includes.h"
25 #include "param/param.h"
26 #include "dsdb/samdb/samdb.h"
27 #include "system/kerberos.h"
28 #include <kdb.h>
29 #include <kadm5/kadm_err.h>
30 #include "kdc/sdb.h"
31 #include "kdc/sdb_kdb.h"
32 #include "auth/kerberos/kerberos.h"
33 #include "auth/kerberos/pac_utils.h"
34 #include "kdc/samba_kdc.h"
35 #include "kdc/pac-glue.h"
36 #include "kdc/db-glue.h"
37 #include "auth/auth.h"
38 #include "kdc/kpasswd_glue.h"
39 #include "auth/auth_sam.h"
40
41 #include "mit_samba.h"
42
43 void mit_samba_context_free(struct mit_samba_context *ctx)
44 {
45 /* free heimdal's krb5_context */
46 if (ctx->context) {
47 krb5_free_context(ctx->context);
48 }
49
50 /* then free everything else */
51 talloc_free(ctx);
52 }
53
54 int mit_samba_context_init(struct mit_samba_context **_ctx)
55 {
56 NTSTATUS status;
57 struct mit_samba_context *ctx;
58 const char *s4_conf_file;
59 int ret;
60 struct samba_kdc_base_context base_ctx;
61
62 ctx = talloc_zero(NULL, struct mit_samba_context);
63 if (!ctx) {
64 ret = ENOMEM;
65 goto done;
66 }
67
68 base_ctx.ev_ctx = tevent_context_init(ctx);
69 if (!base_ctx.ev_ctx) {
70 ret = ENOMEM;
71 goto done;
72 }
73 tevent_loop_allow_nesting(base_ctx.ev_ctx);
74 base_ctx.lp_ctx = loadparm_init_global(false);
75 if (!base_ctx.lp_ctx) {
76 ret = ENOMEM;
77 goto done;
78 }
79
80 setup_logging("mitkdc", DEBUG_DEFAULT_STDOUT);
81
82 /* init s4 configuration */
83 s4_conf_file = lpcfg_configfile(base_ctx.lp_ctx);
84 if (s4_conf_file) {
85 lpcfg_load(base_ctx.lp_ctx, s4_conf_file);
86 } else {
87 lpcfg_load_default(base_ctx.lp_ctx);
88 }
89
90 status = samba_kdc_setup_db_ctx(ctx, &base_ctx, &ctx->db_ctx);
91 if (!NT_STATUS_IS_OK(status)) {
92 ret = EINVAL;
93 goto done;
94 }
95
96 /* init heimdal's krb_context and log facilities */
97 ret = smb_krb5_init_context_basic(ctx,
98 ctx->db_ctx->lp_ctx,
99 &ctx->context);
100 if (ret) {
101 goto done;
102 }
103
104 ret = 0;
105
106 done:
107 if (ret) {
108 mit_samba_context_free(ctx);
109 } else {
110 *_ctx = ctx;
111 }
112 return ret;
113 }
114
115 static krb5_error_code ks_is_tgs_principal(struct mit_samba_context *ctx,
116 krb5_const_principal principal)
117 {
118 char *p;
119 int eq = -1;
120
121 p = smb_krb5_principal_get_comp_string(ctx, ctx->context, principal, 0);
122
123 eq = krb5_princ_size(ctx->context, principal) == 2 &&
124 (strcmp(p, KRB5_TGS_NAME) == 0);
125
126 talloc_free(p);
127
128 return eq;
129 }
130
131 int mit_samba_generate_salt(krb5_data *salt)
132 {
133 if (salt == NULL) {
134 return EINVAL;
135 }
136
137 salt->length = 16;
138 salt->data = malloc(salt->length);
139 if (salt->data == NULL) {
140 return ENOMEM;
141 }
142
143 generate_random_buffer((uint8_t *)salt->data, salt->length);
144
145 return 0;
146 }
147
148 int mit_samba_generate_random_password(krb5_data *pwd)
149 {
150 TALLOC_CTX *tmp_ctx;
151 char *password;
152
153 if (pwd == NULL) {
154 return EINVAL;
155 }
156 pwd->length = 24;
157
158 tmp_ctx = talloc_named(NULL,
159 0,
160 "mit_samba_create_principal_password context");
161 if (tmp_ctx == NULL) {
162 return ENOMEM;
163 }
164
165 password = generate_random_password(tmp_ctx, pwd->length, pwd->length);
166 if (password == NULL) {
167 talloc_free(tmp_ctx);
168 return ENOMEM;
169 }
170
171 pwd->data = strdup(password);
172 talloc_free(tmp_ctx);
173 if (pwd->data == NULL) {
174 return ENOMEM;
175 }
176
177 return 0;
178 }
179
180 int mit_samba_get_principal(struct mit_samba_context *ctx,
181 krb5_const_principal principal,
182 unsigned int kflags,
183 krb5_db_entry **_kentry)
184 {
185 struct sdb_entry_ex sentry = {
186 .free_entry = NULL,
187 };
188 krb5_db_entry *kentry;
189 int ret;
190 int sflags = 0;
191 krb5_principal referral_principal = NULL;
192
193 kentry = calloc(1, sizeof(krb5_db_entry));
194 if (kentry == NULL) {
195 return ENOMEM;
196 }
197
198 if (kflags & KRB5_KDB_FLAG_CANONICALIZE) {
199 sflags |= SDB_F_CANON;
200 }
201 if (kflags & (KRB5_KDB_FLAG_CLIENT_REFERRALS_ONLY |
202 KRB5_KDB_FLAG_INCLUDE_PAC)) {
203 /*
204 * KRB5_KDB_FLAG_CLIENT_REFERRALS_ONLY is equal to
205 * SDB_F_FOR_AS_REQ
206 *
207 * We use ANY to also allow AS_REQ for service principal names
208 * This is supported by Windows.
209 */
210 sflags |= SDB_F_GET_ANY|SDB_F_FOR_AS_REQ;
211 } else if (ks_is_tgs_principal(ctx, principal)) {
212 sflags |= SDB_F_GET_KRBTGT;
213 } else {
214 sflags |= SDB_F_GET_SERVER|SDB_F_FOR_TGS_REQ;
215 }
216
217 /* always set this or the created_by data will not be populated by samba's
218 * backend and we will fail to parse the entry later */
219 sflags |= SDB_F_ADMIN_DATA;
220
221
222 fetch_referral_principal:
223 ret = samba_kdc_fetch(ctx->context, ctx->db_ctx,
224 principal, sflags, 0, &sentry);
225 switch (ret) {
226 case 0:
227 break;
228 case SDB_ERR_NOENTRY:
229 ret = KRB5_KDB_NOENTRY;
230 goto done;
231 case SDB_ERR_WRONG_REALM: {
232 char *dest_realm = NULL;
233 const char *our_realm = lpcfg_realm(ctx->db_ctx->lp_ctx);
234
235 if (sflags & SDB_F_FOR_AS_REQ) {
236 /*
237 * If this is a request for a TGT, we are done. The KDC
238 * will return the correct error to the client.
239 */
240 ret = 0;
241 break;
242 }
243
244 if (referral_principal != NULL) {
245 sdb_free_entry(&sentry);
246 ret = KRB5_KDB_NOENTRY;
247 goto done;
248 }
249
250 /*
251 * We get a TGS request
252 *
253 * cifs/dc7.SAMBA2008R2.EXAMPLE.COM@ADDOM.SAMBA.EXAMPLE.COM
254 *
255 * to our DC for the realm
256 *
257 * ADDOM.SAMBA.EXAMPLE.COM
258 *
259 * We look up if we have and entry in the database and get an
260 * entry with the pricipal:
261 *
262 * cifs/dc7.SAMBA2008R2.EXAMPLE.COM@SAMBA2008R2.EXAMPLE.COM
263 *
264 * and the error: SDB_ERR_WRONG_REALM.
265 *
266 * In the case of a TGS-REQ we need to return a referral ticket
267 * fo the next trust hop to the client. This ticket will have
268 * the following principal:
269 *
270 * krbtgt/SAMBA2008R2.EXAMPLE.COM@ADDOM.SAMBA.EXAMPLE.COM
271 *
272 * We just redo the lookup in the database with the referral
273 * principal and return success.
274 */
275 dest_realm = smb_krb5_principal_get_realm(ctx->context,
276 sentry.entry.principal);
277 sdb_free_entry(&sentry);
278 if (dest_realm == NULL) {
279 ret = KRB5_KDB_NOENTRY;
280 goto done;
281 }
282
283 ret = smb_krb5_make_principal(ctx->context,
284 &referral_principal,
285 our_realm,
286 KRB5_TGS_NAME,
287 dest_realm,
288 NULL);
289 SAFE_FREE(dest_realm);
290 if (ret != 0) {
291 goto done;
292 }
293
294 principal = referral_principal;
295 goto fetch_referral_principal;
296 }
297 case SDB_ERR_NOT_FOUND_HERE:
298 /* FIXME: RODC support */
299 default:
300 goto done;
301 }
302
303 ret = sdb_entry_ex_to_kdb_entry_ex(ctx->context, &sentry, kentry);
304
305 sdb_free_entry(&sentry);
306
307 done:
308 krb5_free_principal(ctx->context, referral_principal);
309 referral_principal = NULL;
310
311 if (ret) {
312 free(kentry);
313 } else {
314 *_kentry = kentry;
315 }
316 return ret;
317 }
318
319 int mit_samba_get_firstkey(struct mit_samba_context *ctx,
320 krb5_db_entry **_kentry)
321 {
322 struct sdb_entry_ex sentry = {
323 .free_entry = NULL,
324 };
325 krb5_db_entry *kentry;
326 int ret;
327
328 kentry = malloc(sizeof(krb5_db_entry));
329 if (kentry == NULL) {
330 return ENOMEM;
331 }
332
333 ret = samba_kdc_firstkey(ctx->context, ctx->db_ctx, &sentry);
334 switch (ret) {
335 case 0:
336 break;
337 case SDB_ERR_NOENTRY:
338 free(kentry);
339 return KRB5_KDB_NOENTRY;
340 case SDB_ERR_NOT_FOUND_HERE:
341 /* FIXME: RODC support */
342 default:
343 free(kentry);
344 return ret;
345 }
346
347 ret = sdb_entry_ex_to_kdb_entry_ex(ctx->context, &sentry, kentry);
348
349 sdb_free_entry(&sentry);
350
351 if (ret) {
352 free(kentry);
353 } else {
354 *_kentry = kentry;
355 }
356 return ret;
357 }
358
359 int mit_samba_get_nextkey(struct mit_samba_context *ctx,
360 krb5_db_entry **_kentry)
361 {
362 struct sdb_entry_ex sentry = {
363 .free_entry = NULL,
364 };
365 krb5_db_entry *kentry;
366 int ret;
367
368 kentry = malloc(sizeof(krb5_db_entry));
369 if (kentry == NULL) {
370 return ENOMEM;
371 }
372
373 ret = samba_kdc_nextkey(ctx->context, ctx->db_ctx, &sentry);
374 switch (ret) {
375 case 0:
376 break;
377 case SDB_ERR_NOENTRY:
378 free(kentry);
379 return KRB5_KDB_NOENTRY;
380 case SDB_ERR_NOT_FOUND_HERE:
381 /* FIXME: RODC support */
382 default:
383 free(kentry);
384 return ret;
385 }
386
387 ret = sdb_entry_ex_to_kdb_entry_ex(ctx->context, &sentry, kentry);
388
389 sdb_free_entry(&sentry);
390
391 if (ret) {
392 free(kentry);
393 } else {
394 *_kentry = kentry;
395 }
396 return ret;
397 }
398
399 int mit_samba_get_pac(struct mit_samba_context *smb_ctx,
400 krb5_context context,
401 krb5_db_entry *client,
402 krb5_keyblock *client_key,
403 krb5_pac *pac)
404 {
405 TALLOC_CTX *tmp_ctx;
406 DATA_BLOB *logon_info_blob = NULL;
407 DATA_BLOB *upn_dns_info_blob = NULL;
408 DATA_BLOB *cred_ndr = NULL;
409 DATA_BLOB **cred_ndr_ptr = NULL;
410 DATA_BLOB cred_blob = data_blob_null;
411 DATA_BLOB *pcred_blob = NULL;
412 NTSTATUS nt_status;
413 krb5_error_code code;
414 struct samba_kdc_entry *skdc_entry;
415
416 skdc_entry = talloc_get_type_abort(client->e_data,
417 struct samba_kdc_entry);
418
419 tmp_ctx = talloc_named(smb_ctx,
420 0,
421 "mit_samba_get_pac_data_blobs context");
422 if (tmp_ctx == NULL) {
423 return ENOMEM;
424 }
425
426 #if 0 /* TODO Find out if this is a pkinit_reply key */
427 /* Check if we have a PREAUTH key */
428 if (client_key != NULL) {
429 cred_ndr_ptr = &cred_ndr;
430 }
431 #endif
432
433 nt_status = samba_kdc_get_pac_blobs(tmp_ctx,
434 skdc_entry,
435 &logon_info_blob,
436 cred_ndr_ptr,
437 &upn_dns_info_blob);
438 if (!NT_STATUS_IS_OK(nt_status)) {
439 talloc_free(tmp_ctx);
440 return EINVAL;
441 }
442
443 if (cred_ndr != NULL) {
444 code = samba_kdc_encrypt_pac_credentials(context,
445 client_key,
446 cred_ndr,
447 tmp_ctx,
448 &cred_blob);
449 if (code != 0) {
450 talloc_free(tmp_ctx);
451 return code;
452 }
453 pcred_blob = &cred_blob;
454 }
455
456 code = samba_make_krb5_pac(context,
457 logon_info_blob,
458 pcred_blob,
459 upn_dns_info_blob,
460 NULL,
461 pac);
462
463 talloc_free(tmp_ctx);
464 return code;
465 }
466
467 krb5_error_code mit_samba_reget_pac(struct mit_samba_context *ctx,
468 krb5_context context,
469 int flags,
470 krb5_const_principal client_principal,
471 krb5_db_entry *client,
472 krb5_db_entry *server,
473 krb5_db_entry *krbtgt,
474 krb5_keyblock *krbtgt_keyblock,
475 krb5_pac *pac)
476 {
477 TALLOC_CTX *tmp_ctx;
478 krb5_error_code code;
479 NTSTATUS nt_status;
480 DATA_BLOB *pac_blob = NULL;
481 DATA_BLOB *upn_blob = NULL;
482 DATA_BLOB *deleg_blob = NULL;
483 struct samba_kdc_entry *client_skdc_entry = NULL;
484 struct samba_kdc_entry *krbtgt_skdc_entry;
485 bool is_in_db = false;
486 bool is_untrusted = false;
487 size_t num_types = 0;
488 uint32_t *types = NULL;
489 uint32_t forced_next_type = 0;
490 size_t i = 0;
491 ssize_t logon_info_idx = -1;
492 ssize_t delegation_idx = -1;
493 ssize_t logon_name_idx = -1;
494 ssize_t upn_dns_info_idx = -1;
495 ssize_t srv_checksum_idx = -1;
496 ssize_t kdc_checksum_idx = -1;
497 krb5_pac new_pac = NULL;
498 bool ok;
499
500 if (client != NULL) {
501 client_skdc_entry =
502 talloc_get_type_abort(client->e_data,
503 struct samba_kdc_entry);
504
505 /* The user account may be set not to want the PAC */
506 ok = samba_princ_needs_pac(client_skdc_entry);
507 if (!ok) {
508 return EINVAL;
509 }
510 }
511
512 if (krbtgt == NULL) {
513 return EINVAL;
514 }
515 krbtgt_skdc_entry =
516 talloc_get_type_abort(krbtgt->e_data,
517 struct samba_kdc_entry);
518
519 tmp_ctx = talloc_named(ctx, 0, "mit_samba_reget_pac context");
520 if (tmp_ctx == NULL) {
521 return ENOMEM;
522 }
523
524 code = samba_krbtgt_is_in_db(krbtgt_skdc_entry,
525 &is_in_db,
526 &is_untrusted);
527 if (code != 0) {
528 goto done;
529 }
530
531 if (is_untrusted) {
532 if (client == NULL) {
533 code = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
534 goto done;
535 }
536
537 nt_status = samba_kdc_get_pac_blobs(tmp_ctx,
538 client_skdc_entry,
539 &pac_blob,
540 NULL,
541 &upn_blob);
542 if (!NT_STATUS_IS_OK(nt_status)) {
543 code = EINVAL;
544 goto done;
545 }
546 } else {
547 struct PAC_SIGNATURE_DATA *pac_srv_sig;
548 struct PAC_SIGNATURE_DATA *pac_kdc_sig;
549
550 pac_blob = talloc_zero(tmp_ctx, DATA_BLOB);
551 if (pac_blob == NULL) {
552 code = ENOMEM;
553 goto done;
554 }
555
556 pac_srv_sig = talloc_zero(tmp_ctx, struct PAC_SIGNATURE_DATA);
557 if (pac_srv_sig == NULL) {
558 code = ENOMEM;
559 goto done;
560 }
561
562 pac_kdc_sig = talloc_zero(tmp_ctx, struct PAC_SIGNATURE_DATA);
563 if (pac_kdc_sig == NULL) {
564 code = ENOMEM;
565 goto done;
566 }
567
568 nt_status = samba_kdc_update_pac_blob(tmp_ctx,
569 context,
570 *pac,
571 pac_blob,
572 pac_srv_sig,
573 pac_kdc_sig);
574 if (!NT_STATUS_IS_OK(nt_status)) {
575 DEBUG(0, ("Update PAC blob failed: %s\n",
576 nt_errstr(nt_status)));
577 code = EINVAL;
578 goto done;
579 }
580
581 if (is_in_db) {
582 /*
583 * Now check the KDC signature, fetching the correct
584 * key based on the enc type.
585 */
586 code = check_pac_checksum(pac_srv_sig->signature,
587 pac_kdc_sig,
588 context,
589 krbtgt_keyblock);
590 if (code != 0) {
591 DBG_INFO("PAC KDC signature failed to verify\n");
592 goto done;
593 }
594 }
595 }
596
597 if (flags & KRB5_KDB_FLAG_CONSTRAINED_DELEGATION) {
598 deleg_blob = talloc_zero(tmp_ctx, DATA_BLOB);
599 if (deleg_blob == NULL) {
600 code = ENOMEM;
601 goto done;
602 }
603
604 nt_status = samba_kdc_update_delegation_info_blob(tmp_ctx,
605 context,
606 *pac,
607 server->princ,
608 discard_const(client_principal),
609 deleg_blob);
610 if (!NT_STATUS_IS_OK(nt_status)) {
611 DEBUG(0, ("Update delegation info failed: %s\n",
612 nt_errstr(nt_status)));
613 code = EINVAL;
614 goto done;
615 }
616 }
617
618 /* Check the types of the given PAC */
619 code = krb5_pac_get_types(context, *pac, &num_types, &types);
620 if (code != 0) {
621 goto done;
622 }
623
624 for (i = 0; i < num_types; i++) {
625 switch (types[i]) {
626 case PAC_TYPE_LOGON_INFO:
627 if (logon_info_idx != -1) {
628 DBG_WARNING("logon type[%u] twice [%zd] and [%zu]: \n",
629 types[i],
630 logon_info_idx,
631 i);
632 SAFE_FREE(types);
633 code = EINVAL;
634 goto done;
635 }
636 logon_info_idx = i;
637 break;
638 case PAC_TYPE_CONSTRAINED_DELEGATION:
639 if (delegation_idx != -1) {
640 DBG_WARNING("logon type[%u] twice [%zd] and [%zu]: \n",
641 types[i],
642 delegation_idx,
643 i);
644 SAFE_FREE(types);
645 code = EINVAL;
646 goto done;
647 }
648 delegation_idx = i;
649 break;
650 case PAC_TYPE_LOGON_NAME:
651 if (logon_name_idx != -1) {
652 DBG_WARNING("logon type[%u] twice [%zd] and [%zu]: \n",
653 types[i],
654 logon_name_idx,
655 i);
656 SAFE_FREE(types);
657 code = EINVAL;
658 goto done;
659 }
660 logon_name_idx = i;
661 break;
662 case PAC_TYPE_UPN_DNS_INFO:
663 if (upn_dns_info_idx != -1) {
664 DBG_WARNING("logon type[%u] twice [%zd] and [%zu]: \n",
665 types[i],
666 upn_dns_info_idx,
667 i);
668 SAFE_FREE(types);
669 code = EINVAL;
670 goto done;
671 }
672 upn_dns_info_idx = i;
673 break;
674 case PAC_TYPE_SRV_CHECKSUM:
675 if (srv_checksum_idx != -1) {
676 DBG_WARNING("logon type[%u] twice [%zd] and [%zu]: \n",
677 types[i],
678 srv_checksum_idx,
679 i);
680 SAFE_FREE(types);
681 code = EINVAL;
682 goto done;
683 }
684 srv_checksum_idx = i;
685 break;
686 case PAC_TYPE_KDC_CHECKSUM:
687 if (kdc_checksum_idx != -1) {
688 DBG_WARNING("logon type[%u] twice [%zd] and [%zu]: \n",
689 types[i],
690 kdc_checksum_idx,
691 i);
692 SAFE_FREE(types);
693 code = EINVAL;
694 goto done;
695 }
696 kdc_checksum_idx = i;
697 break;
698 default:
699 continue;
700 }
701 }
702
703 if (logon_info_idx == -1) {
704 DEBUG(1, ("PAC_TYPE_LOGON_INFO missing\n"));
705 SAFE_FREE(types);
706 code = EINVAL;
707 goto done;
708 }
709 if (logon_name_idx == -1) {
710 DEBUG(1, ("PAC_TYPE_LOGON_NAME missing\n"));
711 SAFE_FREE(types);
712 code = EINVAL;
713 goto done;
714 }
715 if (srv_checksum_idx == -1) {
716 DEBUG(1, ("PAC_TYPE_SRV_CHECKSUM missing\n"));
717 SAFE_FREE(types);
718 code = EINVAL;
719 goto done;
720 }
721 if (kdc_checksum_idx == -1) {
722 DEBUG(1, ("PAC_TYPE_KDC_CHECKSUM missing\n"));
723 SAFE_FREE(types);
724 code = EINVAL;
725 goto done;
726 }
727
728 /* Build an updated PAC */
729 code = krb5_pac_init(context, &new_pac);
730 if (code != 0) {
731 SAFE_FREE(types);
732 goto done;
733 }
734
735 for (i = 0;;) {
736 krb5_data type_data;
737 DATA_BLOB type_blob = data_blob_null;
738 uint32_t type;
739
740 if (forced_next_type != 0) {
741 /*
742 * We need to inject possible missing types
743 */
744 type = forced_next_type;
745 forced_next_type = 0;
746 } else if (i < num_types) {
747 type = types[i];
748 i++;
749 } else {
750 break;
751 }
752
753 switch (type) {
754 case PAC_TYPE_LOGON_INFO:
755 type_blob = *pac_blob;
756
757 if (delegation_idx == -1 && deleg_blob != NULL) {
758 /* inject CONSTRAINED_DELEGATION behind */
759 forced_next_type = PAC_TYPE_CONSTRAINED_DELEGATION;
760 }
761 break;
762 case PAC_TYPE_CONSTRAINED_DELEGATION:
763 if (deleg_blob != NULL) {
764 type_blob = *deleg_blob;
765 }
766 break;
767 case PAC_TYPE_CREDENTIAL_INFO:
768 /*
769 * Note that we copy the credential blob,
770 * as it's only usable with the PKINIT based
771 * AS-REP reply key, it's only available on the
772 * host which did the AS-REQ/AS-REP exchange.
773 *
774 * This matches Windows 2008R2...
775 */
776 break;
777 case PAC_TYPE_LOGON_NAME:
778 /*
779 * This is generated in the main KDC code
780 */
781 continue;
782 case PAC_TYPE_UPN_DNS_INFO:
783 /*
784 * Replace in the RODC case, otherwise
785 * upn_blob is NULL and we just copy.
786 */
787 if (upn_blob != NULL) {
788 type_blob = *upn_blob;
789 }
790 break;
791 case PAC_TYPE_SRV_CHECKSUM:
792 /*
793 * This is generated in the main KDC code
794 */
795 continue;
796 case PAC_TYPE_KDC_CHECKSUM:
797 /*
798 * This is generated in the main KDC code
799 */
800 continue;
801 default:
802 /* just copy... */
803 break;
804 }
805
806 if (type_blob.length != 0) {
807 code = smb_krb5_copy_data_contents(&type_data,
808 type_blob.data,
809 type_blob.length);
810 if (code != 0) {
811 SAFE_FREE(types);
812 krb5_pac_free(context, new_pac);
813 goto done;
814 }
815 } else {
816 code = krb5_pac_get_buffer(context,
817 *pac,
818 type,
819 &type_data);
820 if (code != 0) {
821 SAFE_FREE(types);
822 krb5_pac_free(context, new_pac);
823 goto done;
824 }
825 }
826
827 code = krb5_pac_add_buffer(context,
828 new_pac,
829 type,
830 &type_data);
831 smb_krb5_free_data_contents(context, &type_data);
832 if (code != 0) {
833 SAFE_FREE(types);
834 krb5_pac_free(context, new_pac);
835 goto done;
836 }
837 }
838
839 SAFE_FREE(types);
840
841 /* We now replace the pac */
842 krb5_pac_free(context, *pac);
843 *pac = new_pac;
844 done:
845 talloc_free(tmp_ctx);
846 return code;
847 }
848
849 /* provide header, function is exported but there are no public headers */
850
851 krb5_error_code encode_krb5_padata_sequence(krb5_pa_data *const *rep, krb5_data **code);
852
853 /* this function allocates 'data' using malloc.
854 * The caller is responsible for freeing it */
855 static void samba_kdc_build_edata_reply(NTSTATUS nt_status, DATA_BLOB *e_data)
856 {
857 krb5_error_code ret = 0;
858 krb5_pa_data pa, *ppa = NULL;
859 krb5_data *d = NULL;
860
861 if (!e_data)
862 return;
863
864 e_data->data = NULL;
865 e_data->length = 0;
866
867 pa.magic = KV5M_PA_DATA;
868 pa.pa_type = KRB5_PADATA_PW_SALT;
869 pa.length = 12;
870 pa.contents = malloc(pa.length);
871 if (!pa.contents) {
872 return;
873 }
874
875 SIVAL(pa.contents, 0, NT_STATUS_V(nt_status));
876 SIVAL(pa.contents, 4, 0);
877 SIVAL(pa.contents, 8, 1);
878
879 ppa = &pa;
880
881 ret = encode_krb5_padata_sequence(&ppa, &d);
882 free(pa.contents);
883 if (ret) {
884 return;
885 }
886
887 e_data->data = (uint8_t *)d->data;
888 e_data->length = d->length;
889
890 /* free d, not d->data - gd */
891 free(d);
892
893 return;
894 }
895
896 int mit_samba_check_client_access(struct mit_samba_context *ctx,
897 krb5_db_entry *client,
898 const char *client_name,
899 krb5_db_entry *server,
900 const char *server_name,
901 const char *netbios_name,
902 bool password_change,
903 DATA_BLOB *e_data)
904 {
905 struct samba_kdc_entry *skdc_entry;
906 NTSTATUS nt_status;
907
908 skdc_entry = talloc_get_type(client->e_data, struct samba_kdc_entry);
909
910 nt_status = samba_kdc_check_client_access(skdc_entry,
911 client_name,
912 netbios_name,
913 password_change);
914
915 if (!NT_STATUS_IS_OK(nt_status)) {
916 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
917 return ENOMEM;
918 }
919
920 samba_kdc_build_edata_reply(nt_status, e_data);
921
922 return samba_kdc_map_policy_err(nt_status);
923 }
924
925 return 0;
926 }
927
928 int mit_samba_check_s4u2proxy(struct mit_samba_context *ctx,
929 krb5_db_entry *kentry,
930 const char *target_name,
931 bool is_nt_enterprise_name)
932 {
933 #if 1
934 /*
935 * This is disabled because mit_samba_update_pac_data() does not handle
936 * S4U_DELEGATION_INFO
937 */
938
939 return KRB5KDC_ERR_BADOPTION;
940 #else
941 krb5_principal target_principal;
942 int flags = 0;
943 int ret;
944
945 if (is_nt_enterprise_name) {
946 flags = KRB5_PRINCIPAL_PARSE_ENTERPRISE;
947 }
948
949 ret = krb5_parse_name_flags(ctx->context, target_name,
950 flags, &target_principal);
951 if (ret) {
952 return ret;
953 }
954
955 ret = samba_kdc_check_s4u2proxy(ctx->context,
956 ctx->db_ctx,
957 skdc_entry,
958 target_principal);
959
960 krb5_free_principal(ctx->context, target_principal);
961
962 return ret;
963 #endif
964 }
965
966 static krb5_error_code mit_samba_change_pwd_error(krb5_context context,
967 NTSTATUS result,
968 enum samPwdChangeReason reject_reason,
969 struct samr_DomInfo1 *dominfo)
970 {
971 krb5_error_code code = KADM5_PASS_Q_GENERIC;
972
973 if (NT_STATUS_EQUAL(result, NT_STATUS_NO_SUCH_USER)) {
974 code = KADM5_BAD_PRINCIPAL;
975 krb5_set_error_message(context,
976 code,
977 "No such user when changing password");
978 }
979 if (NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)) {
980 code = KADM5_PASS_Q_GENERIC;
981 krb5_set_error_message(context,
982 code,
983 "Not permitted to change password");
984 }
985 if (NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_RESTRICTION) &&
986 dominfo != NULL) {
987 switch (reject_reason) {
988 case SAM_PWD_CHANGE_PASSWORD_TOO_SHORT:
989 code = KADM5_PASS_Q_TOOSHORT;
990 krb5_set_error_message(context,
991 code,
992 "Password too short, password "
993 "must be at least %d characters "
994 "long.",
995 dominfo->min_password_length);
996 break;
997 case SAM_PWD_CHANGE_NOT_COMPLEX:
998 code = KADM5_PASS_Q_DICT;
999 krb5_set_error_message(context,
1000 code,
1001 "Password does not meet "
1002 "complexity requirements");
1003 break;
1004 case SAM_PWD_CHANGE_PWD_IN_HISTORY:
1005 code = KADM5_PASS_TOOSOON;
1006 krb5_set_error_message(context,
1007 code,
1008 "Password is already in password "
1009 "history. New password must not "
1010 "match any of your %d previous "
1011 "passwords.",
1012 dominfo->password_history_length);
1013 break;
1014 default:
1015 code = KADM5_PASS_Q_GENERIC;
1016 krb5_set_error_message(context,
1017 code,
1018 "Password change rejected, "
1019 "password changes may not be "
1020 "permitted on this account, or "
1021 "the minimum password age may "
1022 "not have elapsed.");
1023 break;
1024 }
1025 }
1026
1027 return code;
1028 }
1029
1030 int mit_samba_kpasswd_change_password(struct mit_samba_context *ctx,
1031 char *pwd,
1032 krb5_db_entry *db_entry)
1033 {
1034 NTSTATUS status;
1035 NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
1036 TALLOC_CTX *tmp_ctx;
1037 DATA_BLOB password;
1038 enum samPwdChangeReason reject_reason;
1039 struct samr_DomInfo1 *dominfo;
1040 const char *error_string = NULL;
1041 struct auth_user_info_dc *user_info_dc;
1042 struct samba_kdc_entry *p;
1043 krb5_error_code code = 0;
1044
1045 #ifdef DEBUG_PASSWORD
1046 DEBUG(1,("mit_samba_kpasswd_change_password called with: %s\n", pwd));
1047 #endif
1048
1049 tmp_ctx = talloc_named(ctx, 0, "mit_samba_kpasswd_change_password");
1050 if (tmp_ctx == NULL) {
1051 return ENOMEM;
1052 }
1053
1054 p = (struct samba_kdc_entry *)db_entry->e_data;
1055
1056 status = authsam_make_user_info_dc(tmp_ctx,
1057 ctx->db_ctx->samdb,
1058 lpcfg_netbios_name(ctx->db_ctx->lp_ctx),
1059 lpcfg_sam_name(ctx->db_ctx->lp_ctx),
1060 lpcfg_sam_dnsname(ctx->db_ctx->lp_ctx),
1061 p->realm_dn,
1062 p->msg,
1063 data_blob(NULL, 0),
1064 data_blob(NULL, 0),
1065 &user_info_dc);
1066 if (!NT_STATUS_IS_OK(status)) {
1067 DEBUG(1,("authsam_make_user_info_dc failed: %s\n",
1068 nt_errstr(status)));
1069 talloc_free(tmp_ctx);
1070 return EINVAL;
1071 }
1072
1073 status = auth_generate_session_info(tmp_ctx,
1074 ctx->db_ctx->lp_ctx,
1075 ctx->db_ctx->samdb,
1076 user_info_dc,
1077 0, /* session_info_flags */
1078 &ctx->session_info);
1079
1080 if (!NT_STATUS_IS_OK(status)) {
1081 DEBUG(1,("auth_generate_session_info failed: %s\n",
1082 nt_errstr(status)));
1083 talloc_free(tmp_ctx);
1084 return EINVAL;
1085 }
1086
1087 /* password is expected as UTF16 */
1088
1089 if (!convert_string_talloc(tmp_ctx, CH_UTF8, CH_UTF16,
1090 pwd, strlen(pwd),
1091 &password.data, &password.length)) {
1092 DEBUG(1,("convert_string_talloc failed\n"));
1093 talloc_free(tmp_ctx);
1094 return EINVAL;
1095 }
1096
1097 status = samdb_kpasswd_change_password(tmp_ctx,
1098 ctx->db_ctx->lp_ctx,
1099 ctx->db_ctx->ev_ctx,
1100 ctx->db_ctx->samdb,
1101 ctx->session_info,
1102 &password,
1103 &reject_reason,
1104 &dominfo,
1105 &error_string,
1106 &result);
1107 if (!NT_STATUS_IS_OK(status)) {
1108 DEBUG(1,("samdb_kpasswd_change_password failed: %s\n",
1109 nt_errstr(status)));
1110 code = KADM5_PASS_Q_GENERIC;
1111 krb5_set_error_message(ctx->context, code, "%s", error_string);
1112 goto out;
1113 }
1114
1115 if (!NT_STATUS_IS_OK(result)) {
1116 code = mit_samba_change_pwd_error(ctx->context,
1117 result,
1118 reject_reason,
1119 dominfo);
1120 }
1121
1122 out:
1123 talloc_free(tmp_ctx);
1124
1125 return code;
1126 }
1127
1128 void mit_samba_zero_bad_password_count(krb5_db_entry *db_entry)
1129 {
1130 struct netr_SendToSamBase *send_to_sam = NULL;
1131 struct samba_kdc_entry *p;
1132 struct ldb_dn *domain_dn;
1133
1134 p = (struct samba_kdc_entry *)db_entry->e_data;
1135
1136 domain_dn = ldb_get_default_basedn(p->kdc_db_ctx->samdb);
1137
1138 authsam_logon_success_accounting(p->kdc_db_ctx->samdb,
1139 p->msg,
1140 domain_dn,
1141 true,
1142 &send_to_sam);
1143 /* TODO: RODC support */
1144 }
1145
1146
1147 void mit_samba_update_bad_password_count(krb5_db_entry *db_entry)
1148 {
1149 struct samba_kdc_entry *p;
1150
1151 p = (struct samba_kdc_entry *)db_entry->e_data;
1152
1153 authsam_update_bad_pwd_count(p->kdc_db_ctx->samdb,
1154 p->msg,
1155 ldb_get_default_basedn(p->kdc_db_ctx->samdb));
1156 }
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