source: vendor/current/source4/kdc/db-glue.c

Last change on this file was 988, checked in by Silvan Scherrer, 9 years ago

Samba Server: update vendor to version 4.4.3
File size: 73.6 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3
4 Database Glue between Samba and the KDC
5
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2009
7 Copyright (C) Simo Sorce <idra@samba.org> 2010
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
22*/
23
24#include "includes.h"
25#include "libcli/security/security.h"
26#include "auth/auth.h"
27#include "auth/auth_sam.h"
28#include "dsdb/samdb/samdb.h"
29#include "dsdb/common/util.h"
30#include "librpc/gen_ndr/ndr_drsblobs.h"
31#include "param/param.h"
32#include "../lib/crypto/md4.h"
33#include "system/kerberos.h"
34#include "auth/kerberos/kerberos.h"
35#include "kdc/sdb.h"
36#include "kdc/samba_kdc.h"
37#include "kdc/db-glue.h"
38
39#define SAMBA_KVNO_GET_KRBTGT(kvno) \
40 ((uint16_t)(((uint32_t)kvno) >> 16))
41
42#define SAMBA_KVNO_AND_KRBTGT(kvno, krbtgt) \
43 ((krb5_kvno)((((uint32_t)kvno) & 0xFFFF) | \
44 ((((uint32_t)krbtgt) << 16) & 0xFFFF0000)))
45
46enum samba_kdc_ent_type
47{ SAMBA_KDC_ENT_TYPE_CLIENT, SAMBA_KDC_ENT_TYPE_SERVER,
48 SAMBA_KDC_ENT_TYPE_KRBTGT, SAMBA_KDC_ENT_TYPE_TRUST, SAMBA_KDC_ENT_TYPE_ANY };
49
50enum trust_direction {
51 UNKNOWN = 0,
52 INBOUND = LSA_TRUST_DIRECTION_INBOUND,
53 OUTBOUND = LSA_TRUST_DIRECTION_OUTBOUND
54};
55
56static const char *trust_attrs[] = {
57 "trustPartner",
58 "trustAuthIncoming",
59 "trustAuthOutgoing",
60 "whenCreated",
61 "msDS-SupportedEncryptionTypes",
62 "trustAttributes",
63 "trustDirection",
64 "trustType",
65 NULL
66};
67
68
69static time_t ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, time_t default_val)
70{
71 const char *tmp;
72 const char *gentime;
73 struct tm tm;
74
75 gentime = ldb_msg_find_attr_as_string(msg, attr, NULL);
76 if (!gentime)
77 return default_val;
78
79 tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
80 if (tmp == NULL) {
81 return default_val;
82 }
83
84 return timegm(&tm);
85}
86
87static struct SDBFlags uf2SDBFlags(krb5_context context, uint32_t userAccountControl, enum samba_kdc_ent_type ent_type)
88{
89 struct SDBFlags flags = int2SDBFlags(0);
90
91 /* we don't allow kadmin deletes */
92 flags.immutable = 1;
93
94 /* mark the principal as invalid to start with */
95 flags.invalid = 1;
96
97 flags.renewable = 1;
98
99 /* All accounts are servers, but this may be disabled again in the caller */
100 flags.server = 1;
101
102 /* Account types - clear the invalid bit if it turns out to be valid */
103 if (userAccountControl & UF_NORMAL_ACCOUNT) {
104 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
105 flags.client = 1;
106 }
107 flags.invalid = 0;
108 }
109
110 if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
111 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
112 flags.client = 1;
113 }
114 flags.invalid = 0;
115 }
116 if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
117 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
118 flags.client = 1;
119 }
120 flags.invalid = 0;
121 }
122 if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
123 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
124 flags.client = 1;
125 }
126 flags.invalid = 0;
127 }
128
129 /* Not permitted to act as a client if disabled */
130 if (userAccountControl & UF_ACCOUNTDISABLE) {
131 flags.client = 0;
132 }
133 if (userAccountControl & UF_LOCKOUT) {
134 flags.locked_out = 1;
135 }
136/*
137 if (userAccountControl & UF_PASSWORD_NOTREQD) {
138 flags.invalid = 1;
139 }
140*/
141/*
142 UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent
143*/
144 if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
145 flags.invalid = 1;
146 }
147
148/* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in samba_kdc_message2entry() */
149
150/*
151 if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
152 flags.invalid = 1;
153 }
154*/
155 if (userAccountControl & UF_SMARTCARD_REQUIRED) {
156 flags.require_hwauth = 1;
157 }
158 if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
159 flags.ok_as_delegate = 1;
160 }
161 if (userAccountControl & UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION) {
162 /*
163 * this is confusing...
164 *
165 * UF_TRUSTED_FOR_DELEGATION
166 * => ok_as_delegate
167 *
168 * and
169 *
170 * UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION
171 * => trusted_for_delegation
172 */
173 flags.trusted_for_delegation = 1;
174 }
175 if (!(userAccountControl & UF_NOT_DELEGATED)) {
176 flags.forwardable = 1;
177 flags.proxiable = 1;
178 }
179
180 if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
181 flags.require_preauth = 0;
182 } else {
183 flags.require_preauth = 1;
184
185 }
186 return flags;
187}
188
189static int samba_kdc_entry_destructor(struct samba_kdc_entry *p)
190{
191 if (p->entry_ex != NULL) {
192 struct sdb_entry_ex *entry_ex = p->entry_ex;
193 free_sdb_entry(&entry_ex->entry);
194 }
195
196 return 0;
197}
198
199static krb5_error_code samba_kdc_message2entry_keys(krb5_context context,
200 struct samba_kdc_db_context *kdc_db_ctx,
201 TALLOC_CTX *mem_ctx,
202 struct ldb_message *msg,
203 uint32_t rid,
204 bool is_rodc,
205 uint32_t userAccountControl,
206 enum samba_kdc_ent_type ent_type,
207 struct sdb_entry_ex *entry_ex)
208{
209 krb5_error_code ret = 0;
210 enum ndr_err_code ndr_err;
211 struct samr_Password *hash;
212 const struct ldb_val *sc_val;
213 struct supplementalCredentialsBlob scb;
214 struct supplementalCredentialsPackage *scpk = NULL;
215 bool newer_keys = false;
216 struct package_PrimaryKerberosBlob _pkb;
217 struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
218 struct package_PrimaryKerberosCtr4 *pkb4 = NULL;
219 uint16_t i;
220 uint16_t allocated_keys = 0;
221 int rodc_krbtgt_number = 0;
222 int kvno = 0;
223 uint32_t supported_enctypes
224 = ldb_msg_find_attr_as_uint(msg,
225 "msDS-SupportedEncryptionTypes",
226 0);
227
228 if (rid == DOMAIN_RID_KRBTGT || is_rodc) {
229 /* KDCs (and KDCs on RODCs) use AES */
230 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
231 } else if (userAccountControl & (UF_PARTIAL_SECRETS_ACCOUNT|UF_SERVER_TRUST_ACCOUNT)) {
232 /* DCs and RODCs comptuer accounts use AES */
233 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
234 } else if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT ||
235 (ent_type == SAMBA_KDC_ENT_TYPE_ANY)) {
236 /* for AS-REQ the client chooses the enc types it
237 * supports, and this will vary between computers a
238 * user logs in from.
239 *
240 * likewise for 'any' return as much as is supported,
241 * to export into a keytab */
242 supported_enctypes = ENC_ALL_TYPES;
243 }
244
245 /* If UF_USE_DES_KEY_ONLY has been set, then don't allow use of the newer enc types */
246 if (userAccountControl & UF_USE_DES_KEY_ONLY) {
247 supported_enctypes = ENC_CRC32|ENC_RSA_MD5;
248 } else {
249 /* Otherwise, add in the default enc types */
250 supported_enctypes |= ENC_CRC32 | ENC_RSA_MD5 | ENC_RC4_HMAC_MD5;
251 }
252
253 /* Is this the krbtgt or a RODC krbtgt */
254 if (is_rodc) {
255 rodc_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
256
257 if (rodc_krbtgt_number == -1) {
258 return EINVAL;
259 }
260 }
261
262 entry_ex->entry.keys.val = NULL;
263 entry_ex->entry.keys.len = 0;
264
265 kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
266 if (is_rodc) {
267 kvno = SAMBA_KVNO_AND_KRBTGT(kvno, rodc_krbtgt_number);
268 }
269 entry_ex->entry.kvno = kvno;
270
271 /* Get keys from the db */
272
273 hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
274 sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
275
276 /* unicodePwd for enctype 0x17 (23) if present */
277 if (hash) {
278 allocated_keys++;
279 }
280
281 /* supplementalCredentials if present */
282 if (sc_val) {
283 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, &scb,
284 (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
285 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
286 dump_data(0, sc_val->data, sc_val->length);
287 ret = EINVAL;
288 goto out;
289 }
290
291 if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) {
292 NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
293 ret = EINVAL;
294 goto out;
295 }
296
297 for (i=0; i < scb.sub.num_packages; i++) {
298 if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) {
299 scpk = &scb.sub.packages[i];
300 if (!scpk->data || !scpk->data[0]) {
301 scpk = NULL;
302 continue;
303 }
304 newer_keys = true;
305 break;
306 } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) {
307 scpk = &scb.sub.packages[i];
308 if (!scpk->data || !scpk->data[0]) {
309 scpk = NULL;
310 }
311 /*
312 * we don't break here in hope to find
313 * a Kerberos-Newer-Keys package
314 */
315 }
316 }
317 }
318 /*
319 * Primary:Kerberos-Newer-Keys or Primary:Kerberos element
320 * of supplementalCredentials
321 */
322 if (scpk) {
323 DATA_BLOB blob;
324
325 blob = strhex_to_data_blob(mem_ctx, scpk->data);
326 if (!blob.data) {
327 ret = ENOMEM;
328 goto out;
329 }
330
331 /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */
332 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &_pkb,
333 (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
334 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
335 ret = EINVAL;
336 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
337 krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
338 goto out;
339 }
340
341 if (newer_keys && _pkb.version != 4) {
342 ret = EINVAL;
343 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
344 krb5_warnx(context, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
345 goto out;
346 }
347
348 if (!newer_keys && _pkb.version != 3) {
349 ret = EINVAL;
350 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
351 krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
352 goto out;
353 }
354
355 if (_pkb.version == 4) {
356 pkb4 = &_pkb.ctr.ctr4;
357 allocated_keys += pkb4->num_keys;
358 } else if (_pkb.version == 3) {
359 pkb3 = &_pkb.ctr.ctr3;
360 allocated_keys += pkb3->num_keys;
361 }
362 }
363
364 if (allocated_keys == 0) {
365 if (kdc_db_ctx->rodc) {
366 /* We are on an RODC, but don't have keys for this account. Signal this to the caller */
367 /* TODO: We need to call a generalised version of auth_sam_trigger_repl_secret from here */
368 return SDB_ERR_NOT_FOUND_HERE;
369 }
370
371 /* oh, no password. Apparently (comment in
372 * hdb-ldap.c) this violates the ASN.1, but this
373 * allows an entry with no keys (yet). */
374 return 0;
375 }
376
377 /* allocate space to decode into */
378 entry_ex->entry.keys.len = 0;
379 entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(struct sdb_key));
380 if (entry_ex->entry.keys.val == NULL) {
381 ret = ENOMEM;
382 goto out;
383 }
384
385 if (hash && (supported_enctypes & ENC_RC4_HMAC_MD5)) {
386 struct sdb_key key = {};
387
388 ret = smb_krb5_keyblock_init_contents(context,
389 ENCTYPE_ARCFOUR_HMAC,
390 hash->hash,
391 sizeof(hash->hash),
392 &key.key);
393 if (ret) {
394 goto out;
395 }
396
397 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
398 entry_ex->entry.keys.len++;
399 }
400
401 if (pkb4) {
402 for (i=0; i < pkb4->num_keys; i++) {
403 struct sdb_key key = {};
404
405 if (!pkb4->keys[i].value) continue;
406
407 if (!(kerberos_enctype_to_bitmap(pkb4->keys[i].keytype) & supported_enctypes)) {
408 continue;
409 }
410
411 if (pkb4->salt.string) {
412 DATA_BLOB salt;
413
414 salt = data_blob_string_const(pkb4->salt.string);
415
416 key.salt = calloc(1, sizeof(*key.salt));
417 if (key.salt == NULL) {
418 ret = ENOMEM;
419 goto out;
420 }
421
422 key.salt->type = KRB5_PW_SALT;
423
424 ret = krb5_copy_data_contents(&key.salt->salt,
425 salt.data,
426 salt.length);
427 if (ret) {
428 free(key.salt);
429 key.salt = NULL;
430 goto out;
431 }
432 }
433
434 /* TODO: maybe pass the iteration_count somehow... */
435
436 ret = smb_krb5_keyblock_init_contents(context,
437 pkb4->keys[i].keytype,
438 pkb4->keys[i].value->data,
439 pkb4->keys[i].value->length,
440 &key.key);
441 if (ret == KRB5_PROG_ETYPE_NOSUPP) {
442 DEBUG(2,("Unsupported keytype ignored - type %u\n",
443 pkb4->keys[i].keytype));
444 ret = 0;
445 continue;
446 }
447 if (ret) {
448 if (key.salt) {
449 kerberos_free_data_contents(context, &key.salt->salt);
450 free(key.salt);
451 key.salt = NULL;
452 }
453 goto out;
454 }
455
456 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
457 entry_ex->entry.keys.len++;
458 }
459 } else if (pkb3) {
460 for (i=0; i < pkb3->num_keys; i++) {
461 struct sdb_key key = {};
462
463 if (!pkb3->keys[i].value) continue;
464
465 if (!(kerberos_enctype_to_bitmap(pkb3->keys[i].keytype) & supported_enctypes)) {
466 continue;
467 }
468
469 if (pkb3->salt.string) {
470 DATA_BLOB salt;
471
472 salt = data_blob_string_const(pkb3->salt.string);
473
474 key.salt = calloc(1, sizeof(*key.salt));
475 if (key.salt == NULL) {
476 ret = ENOMEM;
477 goto out;
478 }
479
480 key.salt->type = KRB5_PW_SALT;
481
482 ret = krb5_copy_data_contents(&key.salt->salt,
483 salt.data,
484 salt.length);
485 if (ret) {
486 free(key.salt);
487 key.salt = NULL;
488 goto out;
489 }
490 }
491
492 ret = smb_krb5_keyblock_init_contents(context,
493 pkb3->keys[i].keytype,
494 pkb3->keys[i].value->data,
495 pkb3->keys[i].value->length,
496 &key.key);
497 if (ret) {
498 if (key.salt) {
499 kerberos_free_data_contents(context, &key.salt->salt);
500 free(key.salt);
501 key.salt = NULL;
502 }
503 goto out;
504 }
505
506 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
507 entry_ex->entry.keys.len++;
508 }
509 }
510
511out:
512 if (ret != 0) {
513 entry_ex->entry.keys.len = 0;
514 }
515 if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
516 free(entry_ex->entry.keys.val);
517 entry_ex->entry.keys.val = NULL;
518 }
519 return ret;
520}
521
522static int principal_comp_strcmp_int(krb5_context context,
523 krb5_const_principal principal,
524 unsigned int component,
525 const char *string,
526 bool do_strcasecmp)
527{
528 const char *p;
529 size_t len;
530
531#if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
532 p = krb5_principal_get_comp_string(context, principal, component);
533 if (p == NULL) {
534 return -1;
535 }
536 len = strlen(p);
537#else
538 krb5_data *d;
539 if (component >= krb5_princ_size(context, principal)) {
540 return -1;
541 }
542
543 d = krb5_princ_component(context, principal, component);
544 if (d == NULL) {
545 return -1;
546 }
547
548 p = d->data;
549 len = d->length;
550#endif
551 if (do_strcasecmp) {
552 return strncasecmp(p, string, len);
553 } else {
554 return strncmp(p, string, len);
555 }
556}
557
558static int principal_comp_strcasecmp(krb5_context context,
559 krb5_const_principal principal,
560 unsigned int component,
561 const char *string)
562{
563 return principal_comp_strcmp_int(context, principal,
564 component, string, true);
565}
566
567static int principal_comp_strcmp(krb5_context context,
568 krb5_const_principal principal,
569 unsigned int component,
570 const char *string)
571{
572 return principal_comp_strcmp_int(context, principal,
573 component, string, false);
574}
575
576/*
577 * Construct an hdb_entry from a directory entry.
578 */
579static krb5_error_code samba_kdc_message2entry(krb5_context context,
580 struct samba_kdc_db_context *kdc_db_ctx,
581 TALLOC_CTX *mem_ctx,
582 krb5_const_principal principal,
583 enum samba_kdc_ent_type ent_type,
584 unsigned flags,
585 struct ldb_dn *realm_dn,
586 struct ldb_message *msg,
587 struct sdb_entry_ex *entry_ex)
588{
589 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
590 uint32_t userAccountControl;
591 uint32_t msDS_User_Account_Control_Computed;
592 unsigned int i;
593 krb5_error_code ret = 0;
594 krb5_boolean is_computer = FALSE;
595
596 struct samba_kdc_entry *p;
597 NTTIME acct_expiry;
598 NTSTATUS status;
599
600 uint32_t rid;
601 bool is_rodc = false;
602 struct ldb_message_element *objectclasses;
603 struct ldb_val computer_val;
604 const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
605 computer_val.data = discard_const_p(uint8_t,"computer");
606 computer_val.length = strlen((const char *)computer_val.data);
607
608 if (ldb_msg_find_element(msg, "msDS-SecondaryKrbTgtNumber")) {
609 is_rodc = true;
610 }
611
612 if (!samAccountName) {
613 ret = ENOENT;
614 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no samAccountName present");
615 goto out;
616 }
617
618 objectclasses = ldb_msg_find_element(msg, "objectClass");
619
620 if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
621 is_computer = TRUE;
622 }
623
624 ZERO_STRUCTP(entry_ex);
625
626 p = talloc_zero(mem_ctx, struct samba_kdc_entry);
627 if (!p) {
628 ret = ENOMEM;
629 goto out;
630 }
631
632 p->kdc_db_ctx = kdc_db_ctx;
633 p->realm_dn = talloc_reference(p, realm_dn);
634 if (!p->realm_dn) {
635 ret = ENOMEM;
636 goto out;
637 }
638
639 talloc_set_destructor(p, samba_kdc_entry_destructor);
640
641 entry_ex->ctx = p;
642
643 userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
644
645 msDS_User_Account_Control_Computed
646 = ldb_msg_find_attr_as_uint(msg,
647 "msDS-User-Account-Control-Computed",
648 UF_ACCOUNTDISABLE);
649
650 /*
651 * This brings in the lockout flag, block the account if not
652 * found. We need the weird UF_ACCOUNTDISABLE check because
653 * we do not want to fail open if the value is not returned,
654 * but 0 is a valid value (all OK)
655 */
656 if (msDS_User_Account_Control_Computed == UF_ACCOUNTDISABLE) {
657 ret = EINVAL;
658 krb5_set_error_message(context, ret, "samba_kdc_message2entry: "
659 "no msDS-User-Account-Control-Computed present");
660 goto out;
661 } else {
662 userAccountControl |= msDS_User_Account_Control_Computed;
663 }
664
665 /*
666 * If we are set to canonicalize, we get back the fixed UPPER
667 * case realm, and the real username (ie matching LDAP
668 * samAccountName)
669 *
670 * Otherwise, if we are set to enterprise, we
671 * get back the whole principal as-sent
672 *
673 * Finally, if we are not set to canonicalize, we get back the
674 * fixed UPPER case realm, but the as-sent username
675 */
676
677 if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT) {
678 if (flags & (SDB_F_CANON)) {
679 /*
680 * When requested to do so, ensure that the
681 * both realm values in the principal are set
682 * to the upper case, canonical realm
683 */
684 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal,
685 lpcfg_realm(lp_ctx), "krbtgt",
686 lpcfg_realm(lp_ctx), NULL);
687 if (ret) {
688 krb5_clear_error_message(context);
689 goto out;
690 }
691 smb_krb5_principal_set_type(context, entry_ex->entry.principal, KRB5_NT_SRV_INST);
692 } else {
693 ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
694 if (ret) {
695 krb5_clear_error_message(context);
696 goto out;
697 }
698 /*
699 * this appears to be required regardless of
700 * the canonicalize flag from the client
701 */
702 ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
703 if (ret) {
704 krb5_clear_error_message(context);
705 goto out;
706 }
707 }
708
709 } else if (ent_type == SAMBA_KDC_ENT_TYPE_ANY && principal == NULL) {
710 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
711 if (ret) {
712 krb5_clear_error_message(context);
713 goto out;
714 }
715 } else if (flags & SDB_F_CANON && flags & SDB_F_FOR_AS_REQ) {
716 /*
717 * SDB_F_CANON maps from the canonicalize flag in the
718 * packet, and has a different meaning between AS-REQ
719 * and TGS-REQ. We only change the principal in the AS-REQ case
720 */
721 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
722 if (ret) {
723 krb5_clear_error_message(context);
724 goto out;
725 }
726 } else {
727 ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
728 if (ret) {
729 krb5_clear_error_message(context);
730 goto out;
731 }
732
733 if (smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL) {
734 /* While we have copied the client principal, tests
735 * show that Win2k3 returns the 'corrected' realm, not
736 * the client-specified realm. This code attempts to
737 * replace the client principal's realm with the one
738 * we determine from our records */
739
740 /* this has to be with malloc() */
741 ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
742 if (ret) {
743 krb5_clear_error_message(context);
744 goto out;
745 }
746 }
747 }
748
749 /* First try and figure out the flags based on the userAccountControl */
750 entry_ex->entry.flags = uf2SDBFlags(context, userAccountControl, ent_type);
751
752 /* Windows 2008 seems to enforce this (very sensible) rule by
753 * default - don't allow offline attacks on a user's password
754 * by asking for a ticket to them as a service (encrypted with
755 * their probably patheticly insecure password) */
756
757 if (entry_ex->entry.flags.server
758 && lpcfg_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
759 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
760 entry_ex->entry.flags.server = 0;
761 }
762 }
763 /*
764 * To give the correct type of error to the client, we must
765 * not just return the entry without .server set, we must
766 * pretend the principal does not exist. Otherwise we may
767 * return ERR_POLICY instead of
768 * KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
769 */
770 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER && entry_ex->entry.flags.server == 0) {
771 ret = SDB_ERR_NOENTRY;
772 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no servicePrincipalName present for this server, refusing with no-such-entry");
773 goto out;
774 }
775 if (flags & SDB_F_ADMIN_DATA) {
776 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
777 * of the Heimdal KDC. They are stored in a the traditional
778 * DB for audit purposes, and still form part of the structure
779 * we must return */
780
781 /* use 'whenCreated' */
782 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
783 /* use 'kadmin' for now (needed by mit_samba) */
784
785 ret = smb_krb5_make_principal(context,
786 &entry_ex->entry.created_by.principal,
787 lpcfg_realm(lp_ctx), "kadmin", NULL);
788 if (ret) {
789 krb5_clear_error_message(context);
790 goto out;
791 }
792
793 entry_ex->entry.modified_by = (struct sdb_event *) malloc(sizeof(struct sdb_event));
794 if (entry_ex->entry.modified_by == NULL) {
795 ret = ENOMEM;
796 krb5_set_error_message(context, ret, "malloc: out of memory");
797 goto out;
798 }
799
800 /* use 'whenChanged' */
801 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
802 /* use 'kadmin' for now (needed by mit_samba) */
803 ret = smb_krb5_make_principal(context,
804 &entry_ex->entry.modified_by->principal,
805 lpcfg_realm(lp_ctx), "kadmin", NULL);
806 if (ret) {
807 krb5_clear_error_message(context);
808 goto out;
809 }
810 }
811
812
813 /* The lack of password controls etc applies to krbtgt by
814 * virtue of being that particular RID */
815 status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
816
817 if (!NT_STATUS_IS_OK(status)) {
818 ret = EINVAL;
819 goto out;
820 }
821
822 if (rid == DOMAIN_RID_KRBTGT) {
823 char *realm = NULL;
824
825 entry_ex->entry.valid_end = NULL;
826 entry_ex->entry.pw_end = NULL;
827
828 entry_ex->entry.flags.invalid = 0;
829 entry_ex->entry.flags.server = 1;
830
831 realm = smb_krb5_principal_get_realm(context, principal);
832 if (realm == NULL) {
833 ret = ENOMEM;
834 goto out;
835 }
836
837 /* Don't mark all requests for the krbtgt/realm as
838 * 'change password', as otherwise we could get into
839 * trouble, and not enforce the password expirty.
840 * Instead, only do it when request is for the kpasswd service */
841 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER
842 && krb5_princ_size(context, principal) == 2
843 && (principal_comp_strcmp(context, principal, 0, "kadmin") == 0)
844 && (principal_comp_strcmp(context, principal, 1, "changepw") == 0)
845 && lpcfg_is_my_domain_or_realm(lp_ctx, realm)) {
846 entry_ex->entry.flags.change_pw = 1;
847 }
848
849 SAFE_FREE(realm);
850
851 entry_ex->entry.flags.client = 0;
852 entry_ex->entry.flags.forwardable = 1;
853 entry_ex->entry.flags.ok_as_delegate = 1;
854 } else if (is_rodc) {
855 /* The RODC krbtgt account is like the main krbtgt,
856 * but it does not have a changepw or kadmin
857 * service */
858
859 entry_ex->entry.valid_end = NULL;
860 entry_ex->entry.pw_end = NULL;
861
862 /* Also don't allow the RODC krbtgt to be a client (it should not be needed) */
863 entry_ex->entry.flags.client = 0;
864 entry_ex->entry.flags.invalid = 0;
865 entry_ex->entry.flags.server = 1;
866
867 entry_ex->entry.flags.client = 0;
868 entry_ex->entry.flags.forwardable = 1;
869 entry_ex->entry.flags.ok_as_delegate = 0;
870 } else if (entry_ex->entry.flags.server && ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
871 /* The account/password expiry only applies when the account is used as a
872 * client (ie password login), not when used as a server */
873
874 /* Make very well sure we don't use this for a client,
875 * it could bypass the password restrictions */
876 entry_ex->entry.flags.client = 0;
877
878 entry_ex->entry.valid_end = NULL;
879 entry_ex->entry.pw_end = NULL;
880
881 } else {
882 NTTIME must_change_time
883 = samdb_result_force_password_change(kdc_db_ctx->samdb, mem_ctx,
884 realm_dn, msg);
885 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
886 entry_ex->entry.pw_end = NULL;
887 } else {
888 entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
889 if (entry_ex->entry.pw_end == NULL) {
890 ret = ENOMEM;
891 goto out;
892 }
893 *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
894 }
895
896 acct_expiry = samdb_result_account_expires(msg);
897 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
898 entry_ex->entry.valid_end = NULL;
899 } else {
900 entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
901 if (entry_ex->entry.valid_end == NULL) {
902 ret = ENOMEM;
903 goto out;
904 }
905 *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
906 }
907 }
908
909 entry_ex->entry.valid_start = NULL;
910
911 entry_ex->entry.max_life = malloc(sizeof(*entry_ex->entry.max_life));
912 if (entry_ex->entry.max_life == NULL) {
913 ret = ENOMEM;
914 goto out;
915 }
916
917 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
918 *entry_ex->entry.max_life = kdc_db_ctx->policy.svc_tkt_lifetime;
919 } else if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT || ent_type == SAMBA_KDC_ENT_TYPE_CLIENT) {
920 *entry_ex->entry.max_life = kdc_db_ctx->policy.usr_tkt_lifetime;
921 } else {
922 *entry_ex->entry.max_life = MIN(kdc_db_ctx->policy.svc_tkt_lifetime,
923 kdc_db_ctx->policy.usr_tkt_lifetime);
924 }
925
926 entry_ex->entry.max_renew = malloc(sizeof(*entry_ex->entry.max_life));
927 if (entry_ex->entry.max_renew == NULL) {
928 ret = ENOMEM;
929 goto out;
930 }
931
932 *entry_ex->entry.max_renew = kdc_db_ctx->policy.renewal_lifetime;
933
934 /* Get keys from the db */
935 ret = samba_kdc_message2entry_keys(context, kdc_db_ctx, p, msg,
936 rid, is_rodc, userAccountControl,
937 ent_type, entry_ex);
938 if (ret) {
939 /* Could be bogus data in the entry, or out of memory */
940 goto out;
941 }
942
943 entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
944 if (entry_ex->entry.etypes == NULL) {
945 krb5_clear_error_message(context);
946 ret = ENOMEM;
947 goto out;
948 }
949 entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
950 entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
951 if (entry_ex->entry.etypes->val == NULL) {
952 krb5_clear_error_message(context);
953 ret = ENOMEM;
954 goto out;
955 }
956 for (i=0; i < entry_ex->entry.etypes->len; i++) {
957 entry_ex->entry.etypes->val[i] = KRB5_KEY_TYPE(&entry_ex->entry.keys.val[i].key);
958 }
959
960
961 p->msg = talloc_steal(p, msg);
962
963out:
964 if (ret != 0) {
965 /* This doesn't free ent itself, that is for the eventual caller to do */
966 sdb_free_entry(entry_ex);
967 ZERO_STRUCTP(entry_ex);
968 } else {
969 talloc_steal(kdc_db_ctx, entry_ex->ctx);
970 }
971
972 return ret;
973}
974
975/*
976 * Construct an hdb_entry from a directory entry.
977 * The kvno is what the remote client asked for
978 */
979static krb5_error_code samba_kdc_trust_message2entry(krb5_context context,
980 struct samba_kdc_db_context *kdc_db_ctx,
981 TALLOC_CTX *mem_ctx, krb5_const_principal principal,
982 enum trust_direction direction,
983 struct ldb_dn *realm_dn,
984 unsigned flags,
985 uint32_t kvno,
986 struct ldb_message *msg,
987 struct sdb_entry_ex *entry_ex)
988{
989 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
990 const char *our_realm = lpcfg_realm(lp_ctx);
991 const char *dnsdomain = NULL;
992 char *partner_realm = NULL;
993 const char *realm = NULL;
994 const char *krbtgt_realm = NULL;
995 DATA_BLOB password_utf16 = data_blob_null;
996 DATA_BLOB password_utf8 = data_blob_null;
997 struct samr_Password _password_hash;
998 const struct samr_Password *password_hash = NULL;
999 const struct ldb_val *password_val;
1000 struct trustAuthInOutBlob password_blob;
1001 struct samba_kdc_entry *p;
1002 bool use_previous = false;
1003 uint32_t current_kvno;
1004 uint32_t previous_kvno;
1005 uint32_t num_keys = 0;
1006 enum ndr_err_code ndr_err;
1007 int ret, trust_direction_flags;
1008 unsigned int i;
1009 struct AuthenticationInformationArray *auth_array;
1010 struct timeval tv;
1011 NTTIME an_hour_ago;
1012 uint32_t *auth_kvno;
1013 bool preferr_current = false;
1014 uint32_t supported_enctypes = ENC_RC4_HMAC_MD5;
1015
1016 if (dsdb_functional_level(kdc_db_ctx->samdb) >= DS_DOMAIN_FUNCTION_2008) {
1017 supported_enctypes = ldb_msg_find_attr_as_uint(msg,
1018 "msDS-SupportedEncryptionTypes",
1019 supported_enctypes);
1020 }
1021
1022 trust_direction_flags = ldb_msg_find_attr_as_int(msg, "trustDirection", 0);
1023 if (!(trust_direction_flags & direction)) {
1024 krb5_clear_error_message(context);
1025 ret = SDB_ERR_NOENTRY;
1026 goto out;
1027 }
1028
1029 dnsdomain = ldb_msg_find_attr_as_string(msg, "trustPartner", NULL);
1030 if (dnsdomain == NULL) {
1031 krb5_clear_error_message(context);
1032 ret = SDB_ERR_NOENTRY;
1033 goto out;
1034 }
1035 partner_realm = strupper_talloc(mem_ctx, dnsdomain);
1036 if (partner_realm == NULL) {
1037 krb5_clear_error_message(context);
1038 ret = ENOMEM;
1039 goto out;
1040 }
1041
1042 if (direction == INBOUND) {
1043 realm = our_realm;
1044 krbtgt_realm = partner_realm;
1045
1046 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
1047 } else { /* OUTBOUND */
1048 realm = partner_realm;
1049 krbtgt_realm = our_realm;
1050
1051 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
1052 }
1053
1054 if (password_val == NULL) {
1055 krb5_clear_error_message(context);
1056 ret = SDB_ERR_NOENTRY;
1057 goto out;
1058 }
1059
1060 ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, &password_blob,
1061 (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
1062 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1063 krb5_clear_error_message(context);
1064 ret = EINVAL;
1065 goto out;
1066 }
1067
1068 p = talloc(mem_ctx, struct samba_kdc_entry);
1069 if (!p) {
1070 ret = ENOMEM;
1071 goto out;
1072 }
1073
1074 p->kdc_db_ctx = kdc_db_ctx;
1075 p->realm_dn = realm_dn;
1076
1077 talloc_set_destructor(p, samba_kdc_entry_destructor);
1078
1079 /* make sure we do not have bogus data in there */
1080 memset(&entry_ex->entry, 0, sizeof(struct sdb_entry));
1081
1082 entry_ex->ctx = p;
1083
1084 /* use 'whenCreated' */
1085 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
1086 /* use 'kadmin' for now (needed by mit_samba) */
1087 ret = smb_krb5_make_principal(context,
1088 &entry_ex->entry.created_by.principal,
1089 realm, "kadmin", NULL);
1090 if (ret) {
1091 krb5_clear_error_message(context);
1092 goto out;
1093 }
1094
1095 /*
1096 * We always need to generate the canonicalized principal
1097 * with the values of our database.
1098 */
1099 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, realm,
1100 "krbtgt", krbtgt_realm, NULL);
1101 if (ret) {
1102 krb5_clear_error_message(context);
1103 goto out;
1104 }
1105 smb_krb5_principal_set_type(context, entry_ex->entry.principal,
1106 KRB5_NT_SRV_INST);
1107
1108 entry_ex->entry.valid_start = NULL;
1109
1110 /* we need to work out if we are going to use the current or
1111 * the previous password hash.
1112 * We base this on the kvno the client passes in. If the kvno
1113 * passed in is equal to the current kvno in our database then
1114 * we use the current structure. If it is the current kvno-1,
1115 * then we use the previous substrucure.
1116 */
1117
1118 /*
1119 * Windows preferrs the previous key for one hour.
1120 */
1121 tv = timeval_current();
1122 if (tv.tv_sec > 3600) {
1123 tv.tv_sec -= 3600;
1124 }
1125 an_hour_ago = timeval_to_nttime(&tv);
1126
1127 /* first work out the current kvno */
1128 current_kvno = 0;
1129 for (i=0; i < password_blob.count; i++) {
1130 struct AuthenticationInformation *a =
1131 &password_blob.current.array[i];
1132
1133 if (a->LastUpdateTime <= an_hour_ago) {
1134 preferr_current = true;
1135 }
1136
1137 if (a->AuthType == TRUST_AUTH_TYPE_VERSION) {
1138 current_kvno = a->AuthInfo.version.version;
1139 }
1140 }
1141 if (current_kvno == 0) {
1142 previous_kvno = 255;
1143 } else {
1144 previous_kvno = current_kvno - 1;
1145 }
1146 for (i=0; i < password_blob.count; i++) {
1147 struct AuthenticationInformation *a =
1148 &password_blob.previous.array[i];
1149
1150 if (a->AuthType == TRUST_AUTH_TYPE_VERSION) {
1151 previous_kvno = a->AuthInfo.version.version;
1152 }
1153 }
1154
1155 /* work out whether we will use the previous or current
1156 password */
1157 if (password_blob.previous.count == 0) {
1158 /* there is no previous password */
1159 use_previous = false;
1160 } else if (!(flags & SDB_F_KVNO_SPECIFIED)) {
1161 /*
1162 * If not specified we use the lowest kvno
1163 * for the first hour after an update.
1164 */
1165 if (preferr_current) {
1166 use_previous = false;
1167 } else if (previous_kvno < current_kvno) {
1168 use_previous = true;
1169 } else {
1170 use_previous = false;
1171 }
1172 } else if (kvno == current_kvno) {
1173 /*
1174 * Exact match ...
1175 */
1176 use_previous = false;
1177 } else if (kvno == previous_kvno) {
1178 /*
1179 * Exact match ...
1180 */
1181 use_previous = true;
1182 } else {
1183 /*
1184 * Fallback to the current one for anything else
1185 */
1186 use_previous = false;
1187 }
1188
1189 if (use_previous) {
1190 auth_array = &password_blob.previous;
1191 auth_kvno = &previous_kvno;
1192 } else {
1193 auth_array = &password_blob.current;
1194 auth_kvno = &current_kvno;
1195 }
1196
1197 /* use the kvno the client specified, if available */
1198 if (flags & SDB_F_KVNO_SPECIFIED) {
1199 entry_ex->entry.kvno = kvno;
1200 } else {
1201 entry_ex->entry.kvno = *auth_kvno;
1202 }
1203
1204 for (i=0; i < auth_array->count; i++) {
1205 if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
1206 bool ok;
1207
1208 password_utf16 = data_blob_const(auth_array->array[i].AuthInfo.clear.password,
1209 auth_array->array[i].AuthInfo.clear.size);
1210 if (password_utf16.length == 0) {
1211 break;
1212 }
1213
1214 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1215 mdfour(_password_hash.hash, password_utf16.data, password_utf16.length);
1216 if (password_hash == NULL) {
1217 num_keys += 1;
1218 }
1219 password_hash = &_password_hash;
1220 }
1221
1222 if (!(supported_enctypes & (ENC_HMAC_SHA1_96_AES128|ENC_HMAC_SHA1_96_AES256))) {
1223 break;
1224 }
1225
1226 ok = convert_string_talloc(mem_ctx,
1227 CH_UTF16MUNGED, CH_UTF8,
1228 password_utf16.data,
1229 password_utf16.length,
1230 (void *)&password_utf8.data,
1231 &password_utf8.length);
1232 if (!ok) {
1233 krb5_clear_error_message(context);
1234 ret = ENOMEM;
1235 goto out;
1236 }
1237
1238 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1239 num_keys += 1;
1240 }
1241 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1242 num_keys += 1;
1243 }
1244 break;
1245 } else if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
1246 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1247 password_hash = &auth_array->array[i].AuthInfo.nt4owf.password;
1248 num_keys += 1;
1249 }
1250 }
1251 }
1252
1253 /* Must have found a cleartext or MD4 password */
1254 if (num_keys == 0) {
1255 DEBUG(1,(__location__ ": no usable key found\n"));
1256 krb5_clear_error_message(context);
1257 ret = SDB_ERR_NOENTRY;
1258 goto out;
1259 }
1260
1261 entry_ex->entry.keys.val = calloc(num_keys, sizeof(struct sdb_key));
1262 if (entry_ex->entry.keys.val == NULL) {
1263 krb5_clear_error_message(context);
1264 ret = ENOMEM;
1265 goto out;
1266 }
1267
1268 if (password_utf8.length != 0) {
1269 struct sdb_key key = {};
1270 krb5_const_principal salt_principal = entry_ex->entry.principal;
1271 krb5_data salt;
1272 krb5_data cleartext_data;
1273
1274 cleartext_data.data = discard_const_p(char, password_utf8.data);
1275 cleartext_data.length = password_utf8.length;
1276
1277 ret = smb_krb5_get_pw_salt(context,
1278 salt_principal,
1279 &salt);
1280 if (ret != 0) {
1281 goto out;
1282 }
1283
1284 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1285 ret = smb_krb5_create_key_from_string(context,
1286 salt_principal,
1287 &salt,
1288 &cleartext_data,
1289 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
1290 &key.key);
1291 if (ret != 0) {
1292 kerberos_free_data_contents(context, &salt);
1293 goto out;
1294 }
1295
1296 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1297 entry_ex->entry.keys.len++;
1298 }
1299
1300 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1301 ret = smb_krb5_create_key_from_string(context,
1302 salt_principal,
1303 &salt,
1304 &cleartext_data,
1305 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
1306 &key.key);
1307 if (ret != 0) {
1308 kerberos_free_data_contents(context, &salt);
1309 goto out;
1310 }
1311
1312 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1313 entry_ex->entry.keys.len++;
1314 }
1315
1316 kerberos_free_data_contents(context, &salt);
1317 }
1318
1319 if (password_hash != NULL) {
1320 struct sdb_key key = {};
1321
1322 ret = smb_krb5_keyblock_init_contents(context,
1323 ENCTYPE_ARCFOUR_HMAC,
1324 password_hash->hash,
1325 sizeof(password_hash->hash),
1326 &key.key);
1327 if (ret != 0) {
1328 goto out;
1329 }
1330
1331 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1332 entry_ex->entry.keys.len++;
1333 }
1334
1335 entry_ex->entry.flags = int2SDBFlags(0);
1336 entry_ex->entry.flags.immutable = 1;
1337 entry_ex->entry.flags.invalid = 0;
1338 entry_ex->entry.flags.server = 1;
1339 entry_ex->entry.flags.require_preauth = 1;
1340
1341 entry_ex->entry.pw_end = NULL;
1342
1343 entry_ex->entry.max_life = NULL;
1344
1345 entry_ex->entry.max_renew = NULL;
1346
1347 entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
1348 if (entry_ex->entry.etypes == NULL) {
1349 krb5_clear_error_message(context);
1350 ret = ENOMEM;
1351 goto out;
1352 }
1353 entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
1354 entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
1355 if (entry_ex->entry.etypes->val == NULL) {
1356 krb5_clear_error_message(context);
1357 ret = ENOMEM;
1358 goto out;
1359 }
1360 for (i=0; i < entry_ex->entry.etypes->len; i++) {
1361 entry_ex->entry.etypes->val[i] = KRB5_KEY_TYPE(&entry_ex->entry.keys.val[i].key);
1362 }
1363
1364 p->msg = talloc_steal(p, msg);
1365
1366out:
1367 TALLOC_FREE(partner_realm);
1368
1369 if (ret != 0) {
1370 /* This doesn't free ent itself, that is for the eventual caller to do */
1371 sdb_free_entry(entry_ex);
1372 } else {
1373 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1374 }
1375
1376 return ret;
1377
1378}
1379
1380static krb5_error_code samba_kdc_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
1381 TALLOC_CTX *mem_ctx,
1382 const char *realm,
1383 struct ldb_dn *realm_dn,
1384 struct ldb_message **pmsg)
1385{
1386 NTSTATUS status;
1387 const char * const *attrs = trust_attrs;
1388
1389 status = dsdb_trust_search_tdo(ldb_ctx, realm, realm,
1390 attrs, mem_ctx, pmsg);
1391 if (NT_STATUS_IS_OK(status)) {
1392 return 0;
1393 } else if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1394 return SDB_ERR_NOENTRY;
1395 } else if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1396 int ret = ENOMEM;
1397 krb5_set_error_message(context, ret, "get_sam_result_trust: out of memory");
1398 return ret;
1399 } else {
1400 int ret = EINVAL;
1401 krb5_set_error_message(context, ret, "get_sam_result_trust: %s", nt_errstr(status));
1402 return ret;
1403 }
1404}
1405
1406static krb5_error_code samba_kdc_lookup_client(krb5_context context,
1407 struct samba_kdc_db_context *kdc_db_ctx,
1408 TALLOC_CTX *mem_ctx,
1409 krb5_const_principal principal,
1410 const char **attrs,
1411 struct ldb_dn **realm_dn,
1412 struct ldb_message **msg)
1413{
1414 NTSTATUS nt_status;
1415 char *principal_string = NULL;
1416
1417 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1418 principal_string = smb_krb5_principal_get_comp_string(mem_ctx, context,
1419 principal, 0);
1420 if (principal_string == NULL) {
1421 return ENOMEM;
1422 }
1423 } else {
1424 char *principal_string_m = NULL;
1425 krb5_error_code ret;
1426
1427 ret = krb5_unparse_name(context, principal, &principal_string_m);
1428 if (ret != 0) {
1429 return ret;
1430 }
1431
1432 principal_string = talloc_strdup(mem_ctx, principal_string_m);
1433 SAFE_FREE(principal_string_m);
1434 if (principal_string == NULL) {
1435 return ENOMEM;
1436 }
1437 }
1438
1439 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1440 mem_ctx, principal_string, attrs,
1441 realm_dn, msg);
1442 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1443 krb5_principal fallback_principal = NULL;
1444 unsigned int num_comp;
1445 char *fallback_realm = NULL;
1446 char *fallback_account = NULL;
1447 krb5_error_code ret;
1448
1449 ret = krb5_parse_name(context, principal_string,
1450 &fallback_principal);
1451 TALLOC_FREE(principal_string);
1452 if (ret != 0) {
1453 return ret;
1454 }
1455
1456 num_comp = krb5_princ_size(context, fallback_principal);
1457 fallback_realm = smb_krb5_principal_get_realm(context,
1458 fallback_principal);
1459 if (fallback_realm == NULL) {
1460 krb5_free_principal(context, fallback_principal);
1461 return ENOMEM;
1462 }
1463
1464 if (num_comp == 1) {
1465 size_t len;
1466
1467 fallback_account = smb_krb5_principal_get_comp_string(mem_ctx,
1468 context, fallback_principal, 0);
1469 if (fallback_account == NULL) {
1470 krb5_free_principal(context, fallback_principal);
1471 SAFE_FREE(fallback_realm);
1472 return ENOMEM;
1473 }
1474
1475 len = strlen(fallback_account);
1476 if (len >= 2 && fallback_account[len - 1] == '$') {
1477 TALLOC_FREE(fallback_account);
1478 }
1479 }
1480 krb5_free_principal(context, fallback_principal);
1481 fallback_principal = NULL;
1482
1483 if (fallback_account != NULL) {
1484 char *with_dollar;
1485
1486 with_dollar = talloc_asprintf(mem_ctx, "%s$",
1487 fallback_account);
1488 if (with_dollar == NULL) {
1489 SAFE_FREE(fallback_realm);
1490 return ENOMEM;
1491 }
1492 TALLOC_FREE(fallback_account);
1493
1494 ret = smb_krb5_make_principal(context,
1495 &fallback_principal,
1496 fallback_realm,
1497 with_dollar, NULL);
1498 TALLOC_FREE(with_dollar);
1499 if (ret != 0) {
1500 SAFE_FREE(fallback_realm);
1501 return ret;
1502 }
1503 }
1504 SAFE_FREE(fallback_realm);
1505
1506 if (fallback_principal != NULL) {
1507 char *fallback_string = NULL;
1508
1509 ret = krb5_unparse_name(context,
1510 fallback_principal,
1511 &fallback_string);
1512 if (ret != 0) {
1513 krb5_free_principal(context, fallback_principal);
1514 return ret;
1515 }
1516
1517 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1518 mem_ctx,
1519 fallback_string,
1520 attrs,
1521 realm_dn, msg);
1522 SAFE_FREE(fallback_string);
1523 }
1524 krb5_free_principal(context, fallback_principal);
1525 fallback_principal = NULL;
1526 }
1527 TALLOC_FREE(principal_string);
1528
1529 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1530 return SDB_ERR_NOENTRY;
1531 } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1532 return ENOMEM;
1533 } else if (!NT_STATUS_IS_OK(nt_status)) {
1534 return EINVAL;
1535 }
1536
1537 return 0;
1538}
1539
1540static krb5_error_code samba_kdc_fetch_client(krb5_context context,
1541 struct samba_kdc_db_context *kdc_db_ctx,
1542 TALLOC_CTX *mem_ctx,
1543 krb5_const_principal principal,
1544 unsigned flags,
1545 struct sdb_entry_ex *entry_ex) {
1546 struct ldb_dn *realm_dn;
1547 krb5_error_code ret;
1548 struct ldb_message *msg = NULL;
1549
1550 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1551 mem_ctx, principal, user_attrs,
1552 &realm_dn, &msg);
1553 if (ret != 0) {
1554 return ret;
1555 }
1556
1557 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1558 principal, SAMBA_KDC_ENT_TYPE_CLIENT,
1559 flags,
1560 realm_dn, msg, entry_ex);
1561 return ret;
1562}
1563
1564static krb5_error_code samba_kdc_fetch_krbtgt(krb5_context context,
1565 struct samba_kdc_db_context *kdc_db_ctx,
1566 TALLOC_CTX *mem_ctx,
1567 krb5_const_principal principal,
1568 unsigned flags,
1569 uint32_t kvno,
1570 struct sdb_entry_ex *entry_ex)
1571{
1572 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1573 krb5_error_code ret;
1574 struct ldb_message *msg = NULL;
1575 struct ldb_dn *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1576 char *realm_from_princ, *realm_from_princ_malloc;
1577 char *realm_princ_comp = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 1);
1578
1579 realm_from_princ_malloc = smb_krb5_principal_get_realm(context, principal);
1580 if (realm_from_princ_malloc == NULL) {
1581 /* can't happen */
1582 return SDB_ERR_NOENTRY;
1583 }
1584 realm_from_princ = talloc_strdup(mem_ctx, realm_from_princ_malloc);
1585 free(realm_from_princ_malloc);
1586 if (realm_from_princ == NULL) {
1587 return SDB_ERR_NOENTRY;
1588 }
1589
1590 if (krb5_princ_size(context, principal) != 2
1591 || (principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME) != 0)) {
1592 /* Not a krbtgt */
1593 return SDB_ERR_NOENTRY;
1594 }
1595
1596 /* krbtgt case. Either us or a trusted realm */
1597
1598 if (lpcfg_is_my_domain_or_realm(lp_ctx, realm_from_princ)
1599 && lpcfg_is_my_domain_or_realm(lp_ctx, realm_princ_comp)) {
1600 /* us, or someone quite like us */
1601 /* Cludge, cludge cludge. If the realm part of krbtgt/realm,
1602 * is in our db, then direct the caller at our primary
1603 * krbtgt */
1604
1605 int lret;
1606 unsigned int krbtgt_number;
1607 /* w2k8r2 sometimes gives us a kvno of 255 for inter-domain
1608 trust tickets. We don't yet know what this means, but we do
1609 seem to need to treat it as unspecified */
1610 if (flags & SDB_F_KVNO_SPECIFIED) {
1611 krbtgt_number = SAMBA_KVNO_GET_KRBTGT(kvno);
1612 if (kdc_db_ctx->rodc) {
1613 if (krbtgt_number != kdc_db_ctx->my_krbtgt_number) {
1614 return SDB_ERR_NOT_FOUND_HERE;
1615 }
1616 }
1617 } else {
1618 krbtgt_number = kdc_db_ctx->my_krbtgt_number;
1619 }
1620
1621 if (krbtgt_number == kdc_db_ctx->my_krbtgt_number) {
1622 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1623 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
1624 krbtgt_attrs, DSDB_SEARCH_NO_GLOBAL_CATALOG,
1625 "(objectClass=user)");
1626 } else {
1627 /* We need to look up an RODC krbtgt (perhaps
1628 * ours, if we are an RODC, perhaps another
1629 * RODC if we are a read-write DC */
1630 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1631 &msg, realm_dn, LDB_SCOPE_SUBTREE,
1632 krbtgt_attrs,
1633 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1634 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=%u))", (unsigned)(krbtgt_number));
1635 }
1636
1637 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1638 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1639 (unsigned)(krbtgt_number));
1640 krb5_set_error_message(context, SDB_ERR_NOENTRY,
1641 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1642 (unsigned)(krbtgt_number));
1643 return SDB_ERR_NOENTRY;
1644 } else if (lret != LDB_SUCCESS) {
1645 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1646 (unsigned)(krbtgt_number));
1647 krb5_set_error_message(context, SDB_ERR_NOENTRY,
1648 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1649 (unsigned)(krbtgt_number));
1650 return SDB_ERR_NOENTRY;
1651 }
1652
1653 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1654 principal, SAMBA_KDC_ENT_TYPE_KRBTGT,
1655 flags, realm_dn, msg, entry_ex);
1656 if (ret != 0) {
1657 krb5_warnx(context, "samba_kdc_fetch: self krbtgt message2entry failed");
1658 }
1659 return ret;
1660
1661 } else {
1662 enum trust_direction direction = UNKNOWN;
1663 const char *realm = NULL;
1664
1665 /* Either an inbound or outbound trust */
1666
1667 if (strcasecmp(lpcfg_realm(lp_ctx), realm_from_princ) == 0) {
1668 /* look for inbound trust */
1669 direction = INBOUND;
1670 realm = realm_princ_comp;
1671 } else if (principal_comp_strcasecmp(context, principal, 1, lpcfg_realm(lp_ctx)) == 0) {
1672 /* look for outbound trust */
1673 direction = OUTBOUND;
1674 realm = realm_from_princ;
1675 } else {
1676 krb5_warnx(context, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1677 realm_from_princ,
1678 realm_princ_comp);
1679 krb5_set_error_message(context, SDB_ERR_NOENTRY, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1680 realm_from_princ,
1681 realm_princ_comp);
1682 return SDB_ERR_NOENTRY;
1683 }
1684
1685 /* Trusted domains are under CN=system */
1686
1687 ret = samba_kdc_lookup_trust(context, kdc_db_ctx->samdb,
1688 mem_ctx,
1689 realm, realm_dn, &msg);
1690
1691 if (ret != 0) {
1692 krb5_warnx(context, "samba_kdc_fetch: could not find principal in DB");
1693 krb5_set_error_message(context, ret, "samba_kdc_fetch: could not find principal in DB");
1694 return ret;
1695 }
1696
1697 ret = samba_kdc_trust_message2entry(context, kdc_db_ctx, mem_ctx,
1698 principal, direction,
1699 realm_dn, flags, kvno, msg, entry_ex);
1700 if (ret != 0) {
1701 krb5_warnx(context, "samba_kdc_fetch: trust_message2entry failed for %s",
1702 ldb_dn_get_linearized(msg->dn));
1703 krb5_set_error_message(context, ret, "samba_kdc_fetch: "
1704 "trust_message2entry failed for %s",
1705 ldb_dn_get_linearized(msg->dn));
1706 }
1707 return ret;
1708 }
1709
1710}
1711
1712static krb5_error_code samba_kdc_lookup_server(krb5_context context,
1713 struct samba_kdc_db_context *kdc_db_ctx,
1714 TALLOC_CTX *mem_ctx,
1715 krb5_const_principal principal,
1716 unsigned flags,
1717 const char **attrs,
1718 struct ldb_dn **realm_dn,
1719 struct ldb_message **msg)
1720{
1721 krb5_error_code ret;
1722 if ((smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL)
1723 && krb5_princ_size(context, principal) >= 2) {
1724 /* 'normal server' case */
1725 int ldb_ret;
1726 NTSTATUS nt_status;
1727 struct ldb_dn *user_dn;
1728 char *principal_string;
1729
1730 ret = krb5_unparse_name_flags(context, principal,
1731 KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1732 &principal_string);
1733 if (ret != 0) {
1734 return ret;
1735 }
1736
1737 /* At this point we may find the host is known to be
1738 * in a different realm, so we should generate a
1739 * referral instead */
1740 nt_status = crack_service_principal_name(kdc_db_ctx->samdb,
1741 mem_ctx, principal_string,
1742 &user_dn, realm_dn);
1743 free(principal_string);
1744
1745 if (!NT_STATUS_IS_OK(nt_status)) {
1746 return SDB_ERR_NOENTRY;
1747 }
1748
1749 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb,
1750 mem_ctx,
1751 msg, user_dn, LDB_SCOPE_BASE,
1752 attrs,
1753 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1754 "(objectClass=*)");
1755 if (ldb_ret != LDB_SUCCESS) {
1756 return SDB_ERR_NOENTRY;
1757 }
1758 return 0;
1759 } else if (!(flags & SDB_F_FOR_AS_REQ)
1760 && smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1761 /*
1762 * The behaviour of accepting an
1763 * KRB5_NT_ENTERPRISE_PRINCIPAL server principal
1764 * containing a UPN only applies to TGS-REQ packets,
1765 * not AS-REQ packets.
1766 */
1767 return samba_kdc_lookup_client(context, kdc_db_ctx,
1768 mem_ctx, principal, attrs,
1769 realm_dn, msg);
1770 } else {
1771 /*
1772 * This case is for:
1773 * - the AS-REQ, where we only accept
1774 * samAccountName based lookups for the server, no
1775 * matter if the name is an
1776 * KRB5_NT_ENTERPRISE_PRINCIPAL or not
1777 * - for the TGS-REQ when we are not given an
1778 * KRB5_NT_ENTERPRISE_PRINCIPAL, which also must
1779 * only lookup samAccountName based names.
1780 */
1781 int lret;
1782 char *short_princ;
1783 krb5_principal enterprise_principal = NULL;
1784 krb5_const_principal used_principal = NULL;
1785 char *name1 = NULL;
1786 size_t len1 = 0;
1787 char *filter = NULL;
1788
1789 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1790 char *str = NULL;
1791 /* Need to reparse the enterprise principal to find the real target */
1792 if (krb5_princ_size(context, principal) != 1) {
1793 ret = KRB5_PARSE_MALFORMED;
1794 krb5_set_error_message(context, ret, "samba_kdc_lookup_server: request for an "
1795 "enterprise principal with wrong (%d) number of components",
1796 krb5_princ_size(context, principal));
1797 return ret;
1798 }
1799 str = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 0);
1800 if (str == NULL) {
1801 return KRB5_PARSE_MALFORMED;
1802 }
1803 ret = krb5_parse_name(context, str,
1804 &enterprise_principal);
1805 talloc_free(str);
1806 if (ret) {
1807 return ret;
1808 }
1809 used_principal = enterprise_principal;
1810 } else {
1811 used_principal = principal;
1812 }
1813
1814 /* server as client principal case, but we must not lookup userPrincipalNames */
1815 *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1816
1817 /* TODO: Check if it is our realm, otherwise give referral */
1818
1819 ret = krb5_unparse_name_flags(context, used_principal,
1820 KRB5_PRINCIPAL_UNPARSE_NO_REALM |
1821 KRB5_PRINCIPAL_UNPARSE_DISPLAY,
1822 &short_princ);
1823 used_principal = NULL;
1824 krb5_free_principal(context, enterprise_principal);
1825 enterprise_principal = NULL;
1826
1827 if (ret != 0) {
1828 krb5_set_error_message(context, ret, "samba_kdc_lookup_principal: could not parse principal");
1829 krb5_warnx(context, "samba_kdc_lookup_principal: could not parse principal");
1830 return ret;
1831 }
1832
1833 name1 = ldb_binary_encode_string(mem_ctx, short_princ);
1834 SAFE_FREE(short_princ);
1835 if (name1 == NULL) {
1836 return ENOMEM;
1837 }
1838 len1 = strlen(name1);
1839 if (len1 >= 1 && name1[len1 - 1] != '$') {
1840 filter = talloc_asprintf(mem_ctx,
1841 "(&(objectClass=user)(|(samAccountName=%s)(samAccountName=%s$)))",
1842 name1, name1);
1843 if (filter == NULL) {
1844 return ENOMEM;
1845 }
1846 } else {
1847 filter = talloc_asprintf(mem_ctx,
1848 "(&(objectClass=user)(samAccountName=%s))",
1849 name1);
1850 if (filter == NULL) {
1851 return ENOMEM;
1852 }
1853 }
1854
1855 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx, msg,
1856 *realm_dn, LDB_SCOPE_SUBTREE,
1857 attrs,
1858 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1859 "%s", filter);
1860 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1861 DEBUG(10, ("Failed to find an entry for %s filter:%s\n",
1862 name1, filter));
1863 return SDB_ERR_NOENTRY;
1864 }
1865 if (lret == LDB_ERR_CONSTRAINT_VIOLATION) {
1866 DEBUG(10, ("Failed to find unique entry for %s filter:%s\n",
1867 name1, filter));
1868 return SDB_ERR_NOENTRY;
1869 }
1870 if (lret != LDB_SUCCESS) {
1871 DEBUG(0, ("Failed single search for %s - %s\n",
1872 name1, ldb_errstring(kdc_db_ctx->samdb)));
1873 return SDB_ERR_NOENTRY;
1874 }
1875 return 0;
1876 }
1877 return SDB_ERR_NOENTRY;
1878}
1879
1880
1881
1882static krb5_error_code samba_kdc_fetch_server(krb5_context context,
1883 struct samba_kdc_db_context *kdc_db_ctx,
1884 TALLOC_CTX *mem_ctx,
1885 krb5_const_principal principal,
1886 unsigned flags,
1887 struct sdb_entry_ex *entry_ex)
1888{
1889 krb5_error_code ret;
1890 struct ldb_dn *realm_dn;
1891 struct ldb_message *msg;
1892
1893 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, principal,
1894 flags, server_attrs, &realm_dn, &msg);
1895 if (ret != 0) {
1896 return ret;
1897 }
1898
1899 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1900 principal, SAMBA_KDC_ENT_TYPE_SERVER,
1901 flags,
1902 realm_dn, msg, entry_ex);
1903 if (ret != 0) {
1904 krb5_warnx(context, "samba_kdc_fetch: message2entry failed");
1905 }
1906
1907 return ret;
1908}
1909
1910static krb5_error_code samba_kdc_lookup_realm(krb5_context context,
1911 struct samba_kdc_db_context *kdc_db_ctx,
1912 TALLOC_CTX *mem_ctx,
1913 krb5_const_principal principal,
1914 unsigned flags,
1915 struct sdb_entry_ex *entry_ex)
1916{
1917 TALLOC_CTX *frame = talloc_stackframe();
1918 NTSTATUS status;
1919 krb5_error_code ret;
1920 char *_realm = NULL;
1921 bool check_realm = false;
1922 const char *realm = NULL;
1923 struct dsdb_trust_routing_table *trt = NULL;
1924 const struct lsa_TrustDomainInfoInfoEx *tdo = NULL;
1925 unsigned int num_comp;
1926 bool ok;
1927 char *upper = NULL;
1928
1929 num_comp = krb5_princ_size(context, principal);
1930
1931 if (flags & SDB_F_GET_CLIENT) {
1932 if (flags & SDB_F_FOR_AS_REQ) {
1933 check_realm = true;
1934 }
1935 }
1936 if (flags & SDB_F_GET_SERVER) {
1937 if (flags & SDB_F_FOR_TGS_REQ) {
1938 check_realm = true;
1939 }
1940 }
1941
1942 if (!check_realm) {
1943 TALLOC_FREE(frame);
1944 return 0;
1945 }
1946
1947 _realm = smb_krb5_principal_get_realm(context, principal);
1948 if (_realm == NULL) {
1949 TALLOC_FREE(frame);
1950 return ENOMEM;
1951 }
1952
1953 /*
1954 * The requested realm needs to be our own
1955 */
1956 ok = lpcfg_is_my_domain_or_realm(kdc_db_ctx->lp_ctx, _realm);
1957 if (!ok) {
1958 /*
1959 * The request is not for us...
1960 */
1961 SAFE_FREE(_realm);
1962 TALLOC_FREE(frame);
1963 return SDB_ERR_NOENTRY;
1964 }
1965
1966 realm = talloc_strdup(frame, _realm);
1967 SAFE_FREE(_realm);
1968 if (realm == NULL) {
1969 TALLOC_FREE(frame);
1970 return ENOMEM;
1971 }
1972
1973 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1974 char *principal_string = NULL;
1975 krb5_principal enterprise_principal = NULL;
1976 char *enterprise_realm = NULL;
1977
1978 if (num_comp != 1) {
1979 TALLOC_FREE(frame);
1980 return SDB_ERR_NOENTRY;
1981 }
1982
1983 principal_string = smb_krb5_principal_get_comp_string(frame, context,
1984 principal, 0);
1985 if (principal_string == NULL) {
1986 TALLOC_FREE(frame);
1987 return ENOMEM;
1988 }
1989
1990 ret = krb5_parse_name(context, principal_string,
1991 &enterprise_principal);
1992 TALLOC_FREE(principal_string);
1993 if (ret) {
1994 TALLOC_FREE(frame);
1995 return ret;
1996 }
1997
1998 enterprise_realm = smb_krb5_principal_get_realm(context,
1999 enterprise_principal);
2000 krb5_free_principal(context, enterprise_principal);
2001 if (enterprise_realm != NULL) {
2002 realm = talloc_strdup(frame, enterprise_realm);
2003 SAFE_FREE(enterprise_realm);
2004 if (realm == NULL) {
2005 TALLOC_FREE(frame);
2006 return ENOMEM;
2007 }
2008 }
2009 }
2010
2011 if (flags & SDB_F_GET_SERVER) {
2012 char *service_realm = NULL;
2013
2014 ret = principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME);
2015 if (ret == 0) {
2016 /*
2017 * we need to search krbtgt/ locally
2018 */
2019 TALLOC_FREE(frame);
2020 return 0;
2021 }
2022
2023 /*
2024 * We need to check the last component against the routing table.
2025 *
2026 * Note this works only with 2 or 3 component principals, e.g:
2027 *
2028 * servicePrincipalName: ldap/W2K8R2-219.bla.base
2029 * servicePrincipalName: ldap/W2K8R2-219.bla.base/bla.base
2030 * servicePrincipalName: ldap/W2K8R2-219.bla.base/ForestDnsZones.bla.base
2031 * servicePrincipalName: ldap/W2K8R2-219.bla.base/DomainDnsZones.bla.base
2032 */
2033
2034 if (num_comp == 2 || num_comp == 3) {
2035 service_realm = smb_krb5_principal_get_comp_string(frame,
2036 context,
2037 principal,
2038 num_comp - 1);
2039 }
2040
2041 if (service_realm != NULL) {
2042 realm = service_realm;
2043 }
2044 }
2045
2046 ok = lpcfg_is_my_domain_or_realm(kdc_db_ctx->lp_ctx, realm);
2047 if (ok) {
2048 /*
2049 * skip the expensive routing lookup
2050 */
2051 TALLOC_FREE(frame);
2052 return 0;
2053 }
2054
2055 status = dsdb_trust_routing_table_load(kdc_db_ctx->samdb,
2056 frame, &trt);
2057 if (!NT_STATUS_IS_OK(status)) {
2058 TALLOC_FREE(frame);
2059 return EINVAL;
2060 }
2061
2062 tdo = dsdb_trust_routing_by_name(trt, realm);
2063 if (tdo == NULL) {
2064 /*
2065 * This principal has to be local
2066 */
2067 TALLOC_FREE(frame);
2068 return 0;
2069 }
2070
2071 if (tdo->trust_attributes & LSA_TRUST_ATTRIBUTE_WITHIN_FOREST) {
2072 /*
2073 * TODO: handle the routing within the forest
2074 *
2075 * This should likely be handled in
2076 * samba_kdc_message2entry() in case we're
2077 * a global catalog. We'd need to check
2078 * if realm_dn is our own domain and derive
2079 * the dns domain name from realm_dn and check that
2080 * against the routing table or fallback to
2081 * the tdo we found here.
2082 *
2083 * But for now we don't support multiple domains
2084 * in our forest correctly anyway.
2085 *
2086 * Just search in our local database.
2087 */
2088 TALLOC_FREE(frame);
2089 return 0;
2090 }
2091
2092 ZERO_STRUCT(entry_ex->entry);
2093
2094 ret = krb5_copy_principal(context, principal,
2095 &entry_ex->entry.principal);
2096 if (ret) {
2097 TALLOC_FREE(frame);
2098 return ret;
2099 }
2100
2101 upper = strupper_talloc(frame, tdo->domain_name.string);
2102 if (upper == NULL) {
2103 TALLOC_FREE(frame);
2104 return ENOMEM;
2105 }
2106
2107 ret = smb_krb5_principal_set_realm(context,
2108 entry_ex->entry.principal,
2109 upper);
2110 if (ret) {
2111 TALLOC_FREE(frame);
2112 return ret;
2113 }
2114
2115 TALLOC_FREE(frame);
2116 return SDB_ERR_WRONG_REALM;
2117}
2118
2119krb5_error_code samba_kdc_fetch(krb5_context context,
2120 struct samba_kdc_db_context *kdc_db_ctx,
2121 krb5_const_principal principal,
2122 unsigned flags,
2123 krb5_kvno kvno,
2124 struct sdb_entry_ex *entry_ex)
2125{
2126 krb5_error_code ret = SDB_ERR_NOENTRY;
2127 TALLOC_CTX *mem_ctx;
2128
2129 mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_fetch context");
2130 if (!mem_ctx) {
2131 ret = ENOMEM;
2132 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2133 return ret;
2134 }
2135
2136 ret = samba_kdc_lookup_realm(context, kdc_db_ctx, mem_ctx,
2137 principal, flags, entry_ex);
2138 if (ret != 0) {
2139 goto done;
2140 }
2141
2142 ret = SDB_ERR_NOENTRY;
2143
2144 if (flags & SDB_F_GET_CLIENT) {
2145 ret = samba_kdc_fetch_client(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
2146 if (ret != SDB_ERR_NOENTRY) goto done;
2147 }
2148 if (flags & SDB_F_GET_SERVER) {
2149 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
2150 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
2151 if (ret != SDB_ERR_NOENTRY) goto done;
2152
2153 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
2154 ret = samba_kdc_fetch_server(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
2155 if (ret != SDB_ERR_NOENTRY) goto done;
2156 }
2157 if (flags & SDB_F_GET_KRBTGT) {
2158 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
2159 if (ret != SDB_ERR_NOENTRY) goto done;
2160 }
2161
2162done:
2163 talloc_free(mem_ctx);
2164 return ret;
2165}
2166
2167struct samba_kdc_seq {
2168 unsigned int index;
2169 unsigned int count;
2170 struct ldb_message **msgs;
2171 struct ldb_dn *realm_dn;
2172};
2173
2174static krb5_error_code samba_kdc_seq(krb5_context context,
2175 struct samba_kdc_db_context *kdc_db_ctx,
2176 struct sdb_entry_ex *entry)
2177{
2178 krb5_error_code ret;
2179 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
2180 const char *realm = lpcfg_realm(kdc_db_ctx->lp_ctx);
2181 struct ldb_message *msg = NULL;
2182 const char *sAMAccountName = NULL;
2183 krb5_principal principal = NULL;
2184 TALLOC_CTX *mem_ctx;
2185
2186 if (!priv) {
2187 return SDB_ERR_NOENTRY;
2188 }
2189
2190 mem_ctx = talloc_named(priv, 0, "samba_kdc_seq context");
2191
2192 if (!mem_ctx) {
2193 ret = ENOMEM;
2194 krb5_set_error_message(context, ret, "samba_kdc_seq: talloc_named() failed!");
2195 return ret;
2196 }
2197
2198 while (priv->index < priv->count) {
2199 msg = priv->msgs[priv->index++];
2200
2201 sAMAccountName = ldb_msg_find_attr_as_string(msg, "sAMAccountName", NULL);
2202 if (sAMAccountName != NULL) {
2203 break;
2204 }
2205 }
2206
2207 if (sAMAccountName == NULL) {
2208 ret = SDB_ERR_NOENTRY;
2209 goto out;
2210 }
2211
2212 ret = smb_krb5_make_principal(context, &principal,
2213 realm, sAMAccountName, NULL);
2214 if (ret != 0) {
2215 goto out;
2216 }
2217
2218 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
2219 principal, SAMBA_KDC_ENT_TYPE_ANY,
2220 SDB_F_ADMIN_DATA|SDB_F_GET_ANY,
2221 priv->realm_dn, msg, entry);
2222
2223out:
2224 if (principal != NULL) {
2225 krb5_free_principal(context, principal);
2226 }
2227
2228 if (ret != 0) {
2229 TALLOC_FREE(priv);
2230 kdc_db_ctx->seq_ctx = NULL;
2231 } else {
2232 talloc_free(mem_ctx);
2233 }
2234
2235 return ret;
2236}
2237
2238krb5_error_code samba_kdc_firstkey(krb5_context context,
2239 struct samba_kdc_db_context *kdc_db_ctx,
2240 struct sdb_entry_ex *entry)
2241{
2242 struct ldb_context *ldb_ctx = kdc_db_ctx->samdb;
2243 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
2244 char *realm;
2245 struct ldb_result *res = NULL;
2246 krb5_error_code ret;
2247 TALLOC_CTX *mem_ctx;
2248 int lret;
2249
2250 if (priv) {
2251 TALLOC_FREE(priv);
2252 kdc_db_ctx->seq_ctx = NULL;
2253 }
2254
2255 priv = (struct samba_kdc_seq *) talloc(kdc_db_ctx, struct samba_kdc_seq);
2256 if (!priv) {
2257 ret = ENOMEM;
2258 krb5_set_error_message(context, ret, "talloc: out of memory");
2259 return ret;
2260 }
2261
2262 priv->index = 0;
2263 priv->msgs = NULL;
2264 priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
2265 priv->count = 0;
2266
2267 mem_ctx = talloc_named(priv, 0, "samba_kdc_firstkey context");
2268
2269 if (!mem_ctx) {
2270 ret = ENOMEM;
2271 krb5_set_error_message(context, ret, "samba_kdc_firstkey: talloc_named() failed!");
2272 return ret;
2273 }
2274
2275 ret = krb5_get_default_realm(context, &realm);
2276 if (ret != 0) {
2277 TALLOC_FREE(priv);
2278 return ret;
2279 }
2280 krb5_free_default_realm(context, realm);
2281
2282 lret = dsdb_search(ldb_ctx, priv, &res,
2283 priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
2284 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2285 "(objectClass=user)");
2286
2287 if (lret != LDB_SUCCESS) {
2288 TALLOC_FREE(priv);
2289 return SDB_ERR_NOENTRY;
2290 }
2291
2292 priv->count = res->count;
2293 priv->msgs = talloc_steal(priv, res->msgs);
2294 talloc_free(res);
2295
2296 kdc_db_ctx->seq_ctx = priv;
2297
2298 ret = samba_kdc_seq(context, kdc_db_ctx, entry);
2299
2300 if (ret != 0) {
2301 TALLOC_FREE(priv);
2302 kdc_db_ctx->seq_ctx = NULL;
2303 } else {
2304 talloc_free(mem_ctx);
2305 }
2306 return ret;
2307}
2308
2309krb5_error_code samba_kdc_nextkey(krb5_context context,
2310 struct samba_kdc_db_context *kdc_db_ctx,
2311 struct sdb_entry_ex *entry)
2312{
2313 return samba_kdc_seq(context, kdc_db_ctx, entry);
2314}
2315
2316/* Check if a given entry may delegate or do s4u2self to this target principal
2317 *
2318 * This is currently a very nasty hack - allowing only delegation to itself.
2319 */
2320krb5_error_code
2321samba_kdc_check_s4u2self(krb5_context context,
2322 struct samba_kdc_db_context *kdc_db_ctx,
2323 struct samba_kdc_entry *skdc_entry,
2324 krb5_const_principal target_principal)
2325{
2326 krb5_error_code ret;
2327 struct ldb_dn *realm_dn;
2328 struct ldb_message *msg;
2329 struct dom_sid *orig_sid;
2330 struct dom_sid *target_sid;
2331 const char *delegation_check_attrs[] = {
2332 "objectSid", NULL
2333 };
2334
2335 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2self");
2336
2337 if (!mem_ctx) {
2338 ret = ENOMEM;
2339 krb5_set_error_message(context, ret, "samba_kdc_check_s4u2self: talloc_named() failed!");
2340 return ret;
2341 }
2342
2343 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, target_principal,
2344 SDB_F_GET_CLIENT|SDB_F_GET_SERVER,
2345 delegation_check_attrs, &realm_dn, &msg);
2346
2347 if (ret != 0) {
2348 talloc_free(mem_ctx);
2349 return ret;
2350 }
2351
2352 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2353 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2354
2355 /* Allow delegation to the same principal, even if by a different
2356 * name. The easy and safe way to prove this is by SID
2357 * comparison */
2358 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2359 talloc_free(mem_ctx);
2360 return KRB5KDC_ERR_BADOPTION;
2361 }
2362
2363 talloc_free(mem_ctx);
2364 return ret;
2365}
2366
2367/* Certificates printed by a the Certificate Authority might have a
2368 * slightly different form of the user principal name to that in the
2369 * database. Allow a mismatch where they both refer to the same
2370 * SID */
2371
2372krb5_error_code
2373samba_kdc_check_pkinit_ms_upn_match(krb5_context context,
2374 struct samba_kdc_db_context *kdc_db_ctx,
2375 struct samba_kdc_entry *skdc_entry,
2376 krb5_const_principal certificate_principal)
2377{
2378 krb5_error_code ret;
2379 struct ldb_dn *realm_dn;
2380 struct ldb_message *msg;
2381 struct dom_sid *orig_sid;
2382 struct dom_sid *target_sid;
2383 const char *ms_upn_check_attrs[] = {
2384 "objectSid", NULL
2385 };
2386
2387 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_pkinit_ms_upn_match");
2388
2389 if (!mem_ctx) {
2390 ret = ENOMEM;
2391 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2392 return ret;
2393 }
2394
2395 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
2396 mem_ctx, certificate_principal,
2397 ms_upn_check_attrs, &realm_dn, &msg);
2398
2399 if (ret != 0) {
2400 talloc_free(mem_ctx);
2401 return ret;
2402 }
2403
2404 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2405 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2406
2407 /* Consider these to be the same principal, even if by a different
2408 * name. The easy and safe way to prove this is by SID
2409 * comparison */
2410 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2411 talloc_free(mem_ctx);
2412#ifdef KRB5_KDC_ERR_CLIENT_NAME_MISMATCH /* Heimdal */
2413 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
2414#elif defined(KRB5KDC_ERR_CLIENT_NAME_MISMATCH) /* MIT */
2415 return KRB5KDC_ERR_CLIENT_NAME_MISMATCH;
2416#endif
2417 }
2418
2419 talloc_free(mem_ctx);
2420 return ret;
2421}
2422
2423/*
2424 * Check if a given entry may delegate to this target principal
2425 * with S4U2Proxy.
2426 */
2427krb5_error_code
2428samba_kdc_check_s4u2proxy(krb5_context context,
2429 struct samba_kdc_db_context *kdc_db_ctx,
2430 struct samba_kdc_entry *skdc_entry,
2431 krb5_const_principal target_principal)
2432{
2433 krb5_error_code ret;
2434 char *tmp = NULL;
2435 const char *client_dn = NULL;
2436 const char *target_principal_name = NULL;
2437 struct ldb_message_element *el;
2438 struct ldb_val val;
2439 unsigned int i;
2440 bool found = false;
2441
2442 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2proxy");
2443
2444 if (!mem_ctx) {
2445 ret = ENOMEM;
2446 krb5_set_error_message(context, ret,
2447 "samba_kdc_check_s4u2proxy:"
2448 " talloc_named() failed!");
2449 return ret;
2450 }
2451
2452 client_dn = ldb_dn_get_linearized(skdc_entry->msg->dn);
2453 if (!client_dn) {
2454 if (errno == 0) {
2455 errno = ENOMEM;
2456 }
2457 ret = errno;
2458 krb5_set_error_message(context, ret,
2459 "samba_kdc_check_s4u2proxy:"
2460 " ldb_dn_get_linearized() failed!");
2461 return ret;
2462 }
2463
2464 /*
2465 * The main heimdal code already checked that the target_principal
2466 * belongs to the same realm as the client.
2467 *
2468 * So we just need the principal without the realm,
2469 * as that is what is configured in the "msDS-AllowedToDelegateTo"
2470 * attribute.
2471 */
2472 ret = krb5_unparse_name_flags(context, target_principal,
2473 KRB5_PRINCIPAL_UNPARSE_NO_REALM, &tmp);
2474 if (ret) {
2475 talloc_free(mem_ctx);
2476 krb5_set_error_message(context, ret,
2477 "samba_kdc_check_s4u2proxy:"
2478 " krb5_unparse_name() failed!");
2479 return ret;
2480 }
2481 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] for target[%s]\n",
2482 client_dn, tmp));
2483
2484 target_principal_name = talloc_strdup(mem_ctx, tmp);
2485 SAFE_FREE(tmp);
2486 if (target_principal_name == NULL) {
2487 ret = ENOMEM;
2488 krb5_set_error_message(context, ret,
2489 "samba_kdc_check_s4u2proxy:"
2490 " talloc_strdup() failed!");
2491 return ret;
2492 }
2493
2494 el = ldb_msg_find_element(skdc_entry->msg, "msDS-AllowedToDelegateTo");
2495 if (el == NULL) {
2496 goto bad_option;
2497 }
2498
2499 val = data_blob_string_const(target_principal_name);
2500
2501 for (i=0; i<el->num_values; i++) {
2502 struct ldb_val *val1 = &val;
2503 struct ldb_val *val2 = &el->values[i];
2504 int cmp;
2505
2506 if (val1->length != val2->length) {
2507 continue;
2508 }
2509
2510 cmp = strncasecmp((const char *)val1->data,
2511 (const char *)val2->data,
2512 val1->length);
2513 if (cmp != 0) {
2514 continue;
2515 }
2516
2517 found = true;
2518 break;
2519 }
2520
2521 if (!found) {
2522 goto bad_option;
2523 }
2524
2525 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] allowed target[%s]\n",
2526 client_dn, tmp));
2527 talloc_free(mem_ctx);
2528 return 0;
2529
2530bad_option:
2531 krb5_set_error_message(context, ret,
2532 "samba_kdc_check_s4u2proxy: client[%s] "
2533 "not allowed for delegation to target[%s]",
2534 client_dn,
2535 target_principal_name);
2536 talloc_free(mem_ctx);
2537 return KRB5KDC_ERR_BADOPTION;
2538}
2539
2540NTSTATUS samba_kdc_setup_db_ctx(TALLOC_CTX *mem_ctx, struct samba_kdc_base_context *base_ctx,
2541 struct samba_kdc_db_context **kdc_db_ctx_out)
2542{
2543 int ldb_ret;
2544 struct ldb_message *msg;
2545 struct auth_session_info *session_info;
2546 struct samba_kdc_db_context *kdc_db_ctx;
2547 /* The idea here is very simple. Using Kerberos to
2548 * authenticate the KDC to the LDAP server is higly likely to
2549 * be circular.
2550 *
2551 * In future we may set this up to use EXERNAL and SSL
2552 * certificates, for now it will almost certainly be NTLMSSP_SET_USERNAME
2553 */
2554
2555 kdc_db_ctx = talloc_zero(mem_ctx, struct samba_kdc_db_context);
2556 if (kdc_db_ctx == NULL) {
2557 return NT_STATUS_NO_MEMORY;
2558 }
2559 kdc_db_ctx->ev_ctx = base_ctx->ev_ctx;
2560 kdc_db_ctx->lp_ctx = base_ctx->lp_ctx;
2561
2562 /* get default kdc policy */
2563 lpcfg_default_kdc_policy(base_ctx->lp_ctx,
2564 &kdc_db_ctx->policy.svc_tkt_lifetime,
2565 &kdc_db_ctx->policy.usr_tkt_lifetime,
2566 &kdc_db_ctx->policy.renewal_lifetime);
2567
2568 session_info = system_session(kdc_db_ctx->lp_ctx);
2569 if (session_info == NULL) {
2570 return NT_STATUS_INTERNAL_ERROR;
2571 }
2572
2573 /* Setup the link to LDB */
2574 kdc_db_ctx->samdb = samdb_connect(kdc_db_ctx, base_ctx->ev_ctx,
2575 base_ctx->lp_ctx, session_info, 0);
2576 if (kdc_db_ctx->samdb == NULL) {
2577 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot open samdb for KDC backend!"));
2578 talloc_free(kdc_db_ctx);
2579 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2580 }
2581
2582 /* Find out our own krbtgt kvno */
2583 ldb_ret = samdb_rodc(kdc_db_ctx->samdb, &kdc_db_ctx->rodc);
2584 if (ldb_ret != LDB_SUCCESS) {
2585 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine if we are an RODC in KDC backend: %s\n",
2586 ldb_errstring(kdc_db_ctx->samdb)));
2587 talloc_free(kdc_db_ctx);
2588 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2589 }
2590 if (kdc_db_ctx->rodc) {
2591 int my_krbtgt_number;
2592 const char *secondary_keytab[] = { "msDS-SecondaryKrbTgtNumber", NULL };
2593 struct ldb_dn *account_dn;
2594 struct ldb_dn *server_dn = samdb_server_dn(kdc_db_ctx->samdb, kdc_db_ctx);
2595 if (!server_dn) {
2596 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server DN in KDC backend: %s\n",
2597 ldb_errstring(kdc_db_ctx->samdb)));
2598 talloc_free(kdc_db_ctx);
2599 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2600 }
2601
2602 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, server_dn,
2603 "serverReference", &account_dn);
2604 if (ldb_ret != LDB_SUCCESS) {
2605 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server account in KDC backend: %s\n",
2606 ldb_errstring(kdc_db_ctx->samdb)));
2607 talloc_free(kdc_db_ctx);
2608 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2609 }
2610
2611 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, account_dn,
2612 "msDS-KrbTgtLink", &kdc_db_ctx->krbtgt_dn);
2613 talloc_free(account_dn);
2614 if (ldb_ret != LDB_SUCCESS) {
2615 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine RODC krbtgt account in KDC backend: %s\n",
2616 ldb_errstring(kdc_db_ctx->samdb)));
2617 talloc_free(kdc_db_ctx);
2618 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2619 }
2620
2621 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2622 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
2623 secondary_keytab,
2624 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2625 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=*))");
2626 if (ldb_ret != LDB_SUCCESS) {
2627 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read krbtgt account %s in KDC backend to get msDS-SecondaryKrbTgtNumber: %s: %s\n",
2628 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2629 ldb_errstring(kdc_db_ctx->samdb),
2630 ldb_strerror(ldb_ret)));
2631 talloc_free(kdc_db_ctx);
2632 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2633 }
2634 my_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
2635 if (my_krbtgt_number == -1) {
2636 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read msDS-SecondaryKrbTgtNumber from krbtgt account %s in KDC backend: got %d\n",
2637 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2638 my_krbtgt_number));
2639 talloc_free(kdc_db_ctx);
2640 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2641 }
2642 kdc_db_ctx->my_krbtgt_number = my_krbtgt_number;
2643
2644 } else {
2645 kdc_db_ctx->my_krbtgt_number = 0;
2646 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2647 &msg,
2648 ldb_get_default_basedn(kdc_db_ctx->samdb),
2649 LDB_SCOPE_SUBTREE,
2650 krbtgt_attrs,
2651 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2652 "(&(objectClass=user)(samAccountName=krbtgt))");
2653
2654 if (ldb_ret != LDB_SUCCESS) {
2655 DEBUG(1, ("samba_kdc_fetch: could not find own KRBTGT in DB: %s\n", ldb_errstring(kdc_db_ctx->samdb)));
2656 talloc_free(kdc_db_ctx);
2657 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2658 }
2659 kdc_db_ctx->krbtgt_dn = talloc_steal(kdc_db_ctx, msg->dn);
2660 kdc_db_ctx->my_krbtgt_number = 0;
2661 talloc_free(msg);
2662 }
2663 *kdc_db_ctx_out = kdc_db_ctx;
2664 return NT_STATUS_OK;
2665}
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