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s4:kdc/db-glue: make use of dsdb_trust_search_tdo()
[Samba.git] / source4 / kdc / db-glue.c
blobaaac0ec7e397418753c111502e5ce4ed729f0c02
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 <hdb.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
46 enum 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
50 enum trust_direction {
51 UNKNOWN = 0,
52 INBOUND = LSA_TRUST_DIRECTION_INBOUND,
53 OUTBOUND = LSA_TRUST_DIRECTION_OUTBOUND
54 };
55
56 static 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
69 static 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
87 static HDBFlags uf2HDBFlags(krb5_context context, uint32_t userAccountControl, enum samba_kdc_ent_type ent_type)
88 {
89 HDBFlags flags = int2HDBFlags(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
189 static int samba_kdc_entry_destructor(struct samba_kdc_entry *p)
190 {
191 if (p->entry_ex != NULL) {
192 hdb_entry_ex *entry_ex = p->entry_ex;
193 free_hdb_entry(&entry_ex->entry);
194 }
195
196 return 0;
197 }
198
199 static void samba_kdc_free_entry(krb5_context context, hdb_entry_ex *entry_ex)
200 {
201 /* this function is called only from hdb_free_entry().
202 * Make sure we neutralize the destructor or we will
203 * get a double free later when hdb_free_entry() will
204 * try to call free_hdb_entry() */
205 talloc_set_destructor(entry_ex->ctx, NULL);
206
207 /* now proceed to free the talloc part */
208 talloc_free(entry_ex->ctx);
209 }
210
211 static krb5_error_code samba_kdc_message2entry_keys(krb5_context context,
212 struct samba_kdc_db_context *kdc_db_ctx,
213 TALLOC_CTX *mem_ctx,
214 struct ldb_message *msg,
215 uint32_t rid,
216 bool is_rodc,
217 uint32_t userAccountControl,
218 enum samba_kdc_ent_type ent_type,
219 hdb_entry_ex *entry_ex)
220 {
221 krb5_error_code ret = 0;
222 enum ndr_err_code ndr_err;
223 struct samr_Password *hash;
224 const struct ldb_val *sc_val;
225 struct supplementalCredentialsBlob scb;
226 struct supplementalCredentialsPackage *scpk = NULL;
227 bool newer_keys = false;
228 struct package_PrimaryKerberosBlob _pkb;
229 struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
230 struct package_PrimaryKerberosCtr4 *pkb4 = NULL;
231 uint16_t i;
232 uint16_t allocated_keys = 0;
233 int rodc_krbtgt_number = 0;
234 int kvno = 0;
235 uint32_t supported_enctypes
236 = ldb_msg_find_attr_as_uint(msg,
237 "msDS-SupportedEncryptionTypes",
238 0);
239
240 if (rid == DOMAIN_RID_KRBTGT || is_rodc) {
241 /* KDCs (and KDCs on RODCs) use AES */
242 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
243 } else if (userAccountControl & (UF_PARTIAL_SECRETS_ACCOUNT|UF_SERVER_TRUST_ACCOUNT)) {
244 /* DCs and RODCs comptuer accounts use AES */
245 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
246 } else if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT ||
247 (ent_type == SAMBA_KDC_ENT_TYPE_ANY)) {
248 /* for AS-REQ the client chooses the enc types it
249 * supports, and this will vary between computers a
250 * user logs in from.
251 *
252 * likewise for 'any' return as much as is supported,
253 * to export into a keytab */
254 supported_enctypes = ENC_ALL_TYPES;
255 }
256
257 /* If UF_USE_DES_KEY_ONLY has been set, then don't allow use of the newer enc types */
258 if (userAccountControl & UF_USE_DES_KEY_ONLY) {
259 supported_enctypes = ENC_CRC32|ENC_RSA_MD5;
260 } else {
261 /* Otherwise, add in the default enc types */
262 supported_enctypes |= ENC_CRC32 | ENC_RSA_MD5 | ENC_RC4_HMAC_MD5;
263 }
264
265 /* Is this the krbtgt or a RODC krbtgt */
266 if (is_rodc) {
267 rodc_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
268
269 if (rodc_krbtgt_number == -1) {
270 return EINVAL;
271 }
272 }
273
274 entry_ex->entry.keys.val = NULL;
275 entry_ex->entry.keys.len = 0;
276
277 kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
278 if (is_rodc) {
279 kvno = SAMBA_KVNO_AND_KRBTGT(kvno, rodc_krbtgt_number);
280 }
281 entry_ex->entry.kvno = kvno;
282
283 /* Get keys from the db */
284
285 hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
286 sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
287
288 /* unicodePwd for enctype 0x17 (23) if present */
289 if (hash) {
290 allocated_keys++;
291 }
292
293 /* supplementalCredentials if present */
294 if (sc_val) {
295 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, &scb,
296 (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
297 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
298 dump_data(0, sc_val->data, sc_val->length);
299 ret = EINVAL;
300 goto out;
301 }
302
303 if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) {
304 NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
305 ret = EINVAL;
306 goto out;
307 }
308
309 for (i=0; i < scb.sub.num_packages; i++) {
310 if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) {
311 scpk = &scb.sub.packages[i];
312 if (!scpk->data || !scpk->data[0]) {
313 scpk = NULL;
314 continue;
315 }
316 newer_keys = true;
317 break;
318 } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) {
319 scpk = &scb.sub.packages[i];
320 if (!scpk->data || !scpk->data[0]) {
321 scpk = NULL;
322 }
323 /*
324 * we don't break here in hope to find
325 * a Kerberos-Newer-Keys package
326 */
327 }
328 }
329 }
330 /*
331 * Primary:Kerberos-Newer-Keys or Primary:Kerberos element
332 * of supplementalCredentials
333 */
334 if (scpk) {
335 DATA_BLOB blob;
336
337 blob = strhex_to_data_blob(mem_ctx, scpk->data);
338 if (!blob.data) {
339 ret = ENOMEM;
340 goto out;
341 }
342
343 /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */
344 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &_pkb,
345 (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
346 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
347 ret = EINVAL;
348 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
349 krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
350 goto out;
351 }
352
353 if (newer_keys && _pkb.version != 4) {
354 ret = EINVAL;
355 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
356 krb5_warnx(context, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
357 goto out;
358 }
359
360 if (!newer_keys && _pkb.version != 3) {
361 ret = EINVAL;
362 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
363 krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
364 goto out;
365 }
366
367 if (_pkb.version == 4) {
368 pkb4 = &_pkb.ctr.ctr4;
369 allocated_keys += pkb4->num_keys;
370 } else if (_pkb.version == 3) {
371 pkb3 = &_pkb.ctr.ctr3;
372 allocated_keys += pkb3->num_keys;
373 }
374 }
375
376 if (allocated_keys == 0) {
377 if (kdc_db_ctx->rodc) {
378 /* We are on an RODC, but don't have keys for this account. Signal this to the caller */
379 /* TODO: We need to call a generalised version of auth_sam_trigger_repl_secret from here */
380 return HDB_ERR_NOT_FOUND_HERE;
381 }
382
383 /* oh, no password. Apparently (comment in
384 * hdb-ldap.c) this violates the ASN.1, but this
385 * allows an entry with no keys (yet). */
386 return 0;
387 }
388
389 /* allocate space to decode into */
390 entry_ex->entry.keys.len = 0;
391 entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(Key));
392 if (entry_ex->entry.keys.val == NULL) {
393 ret = ENOMEM;
394 goto out;
395 }
396
397 if (hash && (supported_enctypes & ENC_RC4_HMAC_MD5)) {
398 Key key;
399
400 key.mkvno = 0;
401 key.salt = NULL; /* No salt for this enc type */
402
403 ret = smb_krb5_keyblock_init_contents(context,
404 ENCTYPE_ARCFOUR_HMAC,
405 hash->hash,
406 sizeof(hash->hash),
407 &key.key);
408 if (ret) {
409 goto out;
410 }
411
412 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
413 entry_ex->entry.keys.len++;
414 }
415
416 if (pkb4) {
417 for (i=0; i < pkb4->num_keys; i++) {
418 Key key;
419
420 if (!pkb4->keys[i].value) continue;
421
422 if (!(kerberos_enctype_to_bitmap(pkb4->keys[i].keytype) & supported_enctypes)) {
423 continue;
424 }
425
426 key.mkvno = 0;
427 key.salt = NULL;
428
429 if (pkb4->salt.string) {
430 DATA_BLOB salt;
431
432 salt = data_blob_string_const(pkb4->salt.string);
433
434 key.salt = calloc(1, sizeof(*key.salt));
435 if (key.salt == NULL) {
436 ret = ENOMEM;
437 goto out;
438 }
439
440 key.salt->type = KRB5_PW_SALT;
441
442 ret = krb5_copy_data_contents(&key.salt->salt,
443 salt.data,
444 salt.length);
445 if (ret) {
446 free(key.salt);
447 key.salt = NULL;
448 goto out;
449 }
450 }
451
452 /* TODO: maybe pass the iteration_count somehow... */
453
454 ret = smb_krb5_keyblock_init_contents(context,
455 pkb4->keys[i].keytype,
456 pkb4->keys[i].value->data,
457 pkb4->keys[i].value->length,
458 &key.key);
459 if (ret == KRB5_PROG_ETYPE_NOSUPP) {
460 DEBUG(2,("Unsupported keytype ignored - type %u\n",
461 pkb4->keys[i].keytype));
462 ret = 0;
463 continue;
464 }
465 if (ret) {
466 if (key.salt) {
467 free_Salt(key.salt);
468 free(key.salt);
469 key.salt = NULL;
470 }
471 goto out;
472 }
473
474 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
475 entry_ex->entry.keys.len++;
476 }
477 } else if (pkb3) {
478 for (i=0; i < pkb3->num_keys; i++) {
479 Key key;
480
481 if (!pkb3->keys[i].value) continue;
482
483 if (!(kerberos_enctype_to_bitmap(pkb3->keys[i].keytype) & supported_enctypes)) {
484 continue;
485 }
486
487 key.mkvno = 0;
488 key.salt = NULL;
489
490 if (pkb3->salt.string) {
491 DATA_BLOB salt;
492
493 salt = data_blob_string_const(pkb3->salt.string);
494
495 key.salt = calloc(1, sizeof(*key.salt));
496 if (key.salt == NULL) {
497 ret = ENOMEM;
498 goto out;
499 }
500
501 key.salt->type = KRB5_PW_SALT;
502
503 ret = krb5_copy_data_contents(&key.salt->salt,
504 salt.data,
505 salt.length);
506 if (ret) {
507 free(key.salt);
508 key.salt = NULL;
509 goto out;
510 }
511 }
512
513 ret = smb_krb5_keyblock_init_contents(context,
514 pkb3->keys[i].keytype,
515 pkb3->keys[i].value->data,
516 pkb3->keys[i].value->length,
517 &key.key);
518 if (ret) {
519 if (key.salt) {
520 free_Salt(key.salt);
521 free(key.salt);
522 key.salt = NULL;
523 }
524 goto out;
525 }
526
527 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
528 entry_ex->entry.keys.len++;
529 }
530 }
531
532 out:
533 if (ret != 0) {
534 entry_ex->entry.keys.len = 0;
535 }
536 if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
537 free(entry_ex->entry.keys.val);
538 entry_ex->entry.keys.val = NULL;
539 }
540 return ret;
541 }
542
543 static int principal_comp_strcmp_int(krb5_context context,
544 krb5_const_principal principal,
545 unsigned int component,
546 const char *string,
547 bool do_strcasecmp)
548 {
549 const char *p;
550 size_t len;
551
552 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
553 p = krb5_principal_get_comp_string(context, principal, component);
554 if (p == NULL) {
555 return -1;
556 }
557 len = strlen(p);
558 #else
559 krb5_data *d;
560 if (component >= krb5_princ_size(context, principal)) {
561 return -1;
562 }
563
564 d = krb5_princ_component(context, principal, component);
565 if (d == NULL) {
566 return -1;
567 }
568
569 p = d->data;
570 len = d->length;
571 #endif
572 if (do_strcasecmp) {
573 return strncasecmp(p, string, len);
574 } else {
575 return strncmp(p, string, len);
576 }
577 }
578
579 static int principal_comp_strcasecmp(krb5_context context,
580 krb5_const_principal principal,
581 unsigned int component,
582 const char *string)
583 {
584 return principal_comp_strcmp_int(context, principal,
585 component, string, true);
586 }
587
588 static int principal_comp_strcmp(krb5_context context,
589 krb5_const_principal principal,
590 unsigned int component,
591 const char *string)
592 {
593 return principal_comp_strcmp_int(context, principal,
594 component, string, false);
595 }
596
597 /*
598 * Construct an hdb_entry from a directory entry.
599 */
600 static krb5_error_code samba_kdc_message2entry(krb5_context context,
601 struct samba_kdc_db_context *kdc_db_ctx,
602 TALLOC_CTX *mem_ctx,
603 krb5_const_principal principal,
604 enum samba_kdc_ent_type ent_type,
605 unsigned flags,
606 struct ldb_dn *realm_dn,
607 struct ldb_message *msg,
608 hdb_entry_ex *entry_ex)
609 {
610 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
611 uint32_t userAccountControl;
612 uint32_t msDS_User_Account_Control_Computed;
613 unsigned int i;
614 krb5_error_code ret = 0;
615 krb5_boolean is_computer = FALSE;
616
617 struct samba_kdc_entry *p;
618 NTTIME acct_expiry;
619 NTSTATUS status;
620
621 uint32_t rid;
622 bool is_rodc = false;
623 struct ldb_message_element *objectclasses;
624 struct ldb_val computer_val;
625 const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
626 computer_val.data = discard_const_p(uint8_t,"computer");
627 computer_val.length = strlen((const char *)computer_val.data);
628
629 if (ldb_msg_find_element(msg, "msDS-SecondaryKrbTgtNumber")) {
630 is_rodc = true;
631 }
632
633 if (!samAccountName) {
634 ret = ENOENT;
635 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no samAccountName present");
636 goto out;
637 }
638
639 objectclasses = ldb_msg_find_element(msg, "objectClass");
640
641 if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
642 is_computer = TRUE;
643 }
644
645 ZERO_STRUCTP(entry_ex);
646
647 p = talloc_zero(mem_ctx, struct samba_kdc_entry);
648 if (!p) {
649 ret = ENOMEM;
650 goto out;
651 }
652
653 p->kdc_db_ctx = kdc_db_ctx;
654 p->entry_ex = entry_ex;
655 p->realm_dn = talloc_reference(p, realm_dn);
656 if (!p->realm_dn) {
657 ret = ENOMEM;
658 goto out;
659 }
660
661 talloc_set_destructor(p, samba_kdc_entry_destructor);
662
663 /* make sure we do not have bogus data in there */
664 memset(&entry_ex->entry, 0, sizeof(hdb_entry));
665
666 entry_ex->ctx = p;
667 entry_ex->free_entry = samba_kdc_free_entry;
668
669 userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
670
671 msDS_User_Account_Control_Computed
672 = ldb_msg_find_attr_as_uint(msg,
673 "msDS-User-Account-Control-Computed",
674 UF_ACCOUNTDISABLE);
675
676 /*
677 * This brings in the lockout flag, block the account if not
678 * found. We need the weird UF_ACCOUNTDISABLE check because
679 * we do not want to fail open if the value is not returned,
680 * but 0 is a valid value (all OK)
681 */
682 if (msDS_User_Account_Control_Computed == UF_ACCOUNTDISABLE) {
683 ret = EINVAL;
684 krb5_set_error_message(context, ret, "samba_kdc_message2entry: "
685 "no msDS-User-Account-Control-Computed present");
686 goto out;
687 } else {
688 userAccountControl |= msDS_User_Account_Control_Computed;
689 }
690
691 /*
692 * If we are set to canonicalize, we get back the fixed UPPER
693 * case realm, and the real username (ie matching LDAP
694 * samAccountName)
695 *
696 * Otherwise, if we are set to enterprise, we
697 * get back the whole principal as-sent
698 *
699 * Finally, if we are not set to canonicalize, we get back the
700 * fixed UPPER case realm, but the as-sent username
701 */
702
703 if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT) {
704 if (flags & (HDB_F_CANON)) {
705 /*
706 * When requested to do so, ensure that the
707 * both realm values in the principal are set
708 * to the upper case, canonical realm
709 */
710 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal,
711 lpcfg_realm(lp_ctx), "krbtgt",
712 lpcfg_realm(lp_ctx), NULL);
713 if (ret) {
714 krb5_clear_error_message(context);
715 goto out;
716 }
717 smb_krb5_principal_set_type(context, entry_ex->entry.principal, KRB5_NT_SRV_INST);
718 } else {
719 ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
720 if (ret) {
721 krb5_clear_error_message(context);
722 goto out;
723 }
724 /*
725 * this appears to be required regardless of
726 * the canonicalize flag from the client
727 */
728 ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
729 if (ret) {
730 krb5_clear_error_message(context);
731 goto out;
732 }
733 }
734
735 } else if (ent_type == SAMBA_KDC_ENT_TYPE_ANY && principal == NULL) {
736 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
737 if (ret) {
738 krb5_clear_error_message(context);
739 goto out;
740 }
741 } else if (flags & HDB_F_CANON && flags & HDB_F_FOR_AS_REQ) {
742 /*
743 * HDB_F_CANON maps from the canonicalize flag in the
744 * packet, and has a different meaning between AS-REQ
745 * and TGS-REQ. We only change the principal in the AS-REQ case
746 */
747 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
748 if (ret) {
749 krb5_clear_error_message(context);
750 goto out;
751 }
752 } else {
753 ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
754 if (ret) {
755 krb5_clear_error_message(context);
756 goto out;
757 }
758
759 if (smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL) {
760 /* While we have copied the client principal, tests
761 * show that Win2k3 returns the 'corrected' realm, not
762 * the client-specified realm. This code attempts to
763 * replace the client principal's realm with the one
764 * we determine from our records */
765
766 /* this has to be with malloc() */
767 ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
768 if (ret) {
769 krb5_clear_error_message(context);
770 goto out;
771 }
772 }
773 }
774
775 /* First try and figure out the flags based on the userAccountControl */
776 entry_ex->entry.flags = uf2HDBFlags(context, userAccountControl, ent_type);
777
778 /* Windows 2008 seems to enforce this (very sensible) rule by
779 * default - don't allow offline attacks on a user's password
780 * by asking for a ticket to them as a service (encrypted with
781 * their probably patheticly insecure password) */
782
783 if (entry_ex->entry.flags.server
784 && lpcfg_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
785 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
786 entry_ex->entry.flags.server = 0;
787 }
788 }
789 /*
790 * To give the correct type of error to the client, we must
791 * not just return the entry without .server set, we must
792 * pretend the principal does not exist. Otherwise we may
793 * return ERR_POLICY instead of
794 * KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
795 */
796 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER && entry_ex->entry.flags.server == 0) {
797 ret = HDB_ERR_NOENTRY;
798 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no servicePrincipalName present for this server, refusing with no-such-entry");
799 goto out;
800 }
801 if (flags & HDB_F_ADMIN_DATA) {
802 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
803 * of the Heimdal KDC. They are stored in a the traditional
804 * DB for audit purposes, and still form part of the structure
805 * we must return */
806
807 /* use 'whenCreated' */
808 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
809 /* use 'kadmin' for now (needed by mit_samba) */
810
811 ret = smb_krb5_make_principal(context,
812 &entry_ex->entry.created_by.principal,
813 lpcfg_realm(lp_ctx), "kadmin", NULL);
814 if (ret) {
815 krb5_clear_error_message(context);
816 goto out;
817 }
818
819 entry_ex->entry.modified_by = (Event *) malloc(sizeof(Event));
820 if (entry_ex->entry.modified_by == NULL) {
821 ret = ENOMEM;
822 krb5_set_error_message(context, ret, "malloc: out of memory");
823 goto out;
824 }
825
826 /* use 'whenChanged' */
827 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
828 /* use 'kadmin' for now (needed by mit_samba) */
829 ret = smb_krb5_make_principal(context,
830 &entry_ex->entry.modified_by->principal,
831 lpcfg_realm(lp_ctx), "kadmin", NULL);
832 if (ret) {
833 krb5_clear_error_message(context);
834 goto out;
835 }
836 }
837
838
839 /* The lack of password controls etc applies to krbtgt by
840 * virtue of being that particular RID */
841 status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
842
843 if (!NT_STATUS_IS_OK(status)) {
844 ret = EINVAL;
845 goto out;
846 }
847
848 if (rid == DOMAIN_RID_KRBTGT) {
849 char *realm = NULL;
850
851 entry_ex->entry.valid_end = NULL;
852 entry_ex->entry.pw_end = NULL;
853
854 entry_ex->entry.flags.invalid = 0;
855 entry_ex->entry.flags.server = 1;
856
857 realm = smb_krb5_principal_get_realm(context, principal);
858 if (realm == NULL) {
859 ret = ENOMEM;
860 goto out;
861 }
862
863 /* Don't mark all requests for the krbtgt/realm as
864 * 'change password', as otherwise we could get into
865 * trouble, and not enforce the password expirty.
866 * Instead, only do it when request is for the kpasswd service */
867 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER
868 && krb5_princ_size(context, principal) == 2
869 && (principal_comp_strcmp(context, principal, 0, "kadmin") == 0)
870 && (principal_comp_strcmp(context, principal, 1, "changepw") == 0)
871 && lpcfg_is_my_domain_or_realm(lp_ctx, realm)) {
872 entry_ex->entry.flags.change_pw = 1;
873 }
874
875 SAFE_FREE(realm);
876
877 entry_ex->entry.flags.client = 0;
878 entry_ex->entry.flags.forwardable = 1;
879 entry_ex->entry.flags.ok_as_delegate = 1;
880 } else if (is_rodc) {
881 /* The RODC krbtgt account is like the main krbtgt,
882 * but it does not have a changepw or kadmin
883 * service */
884
885 entry_ex->entry.valid_end = NULL;
886 entry_ex->entry.pw_end = NULL;
887
888 /* Also don't allow the RODC krbtgt to be a client (it should not be needed) */
889 entry_ex->entry.flags.client = 0;
890 entry_ex->entry.flags.invalid = 0;
891 entry_ex->entry.flags.server = 1;
892
893 entry_ex->entry.flags.client = 0;
894 entry_ex->entry.flags.forwardable = 1;
895 entry_ex->entry.flags.ok_as_delegate = 0;
896 } else if (entry_ex->entry.flags.server && ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
897 /* The account/password expiry only applies when the account is used as a
898 * client (ie password login), not when used as a server */
899
900 /* Make very well sure we don't use this for a client,
901 * it could bypass the password restrictions */
902 entry_ex->entry.flags.client = 0;
903
904 entry_ex->entry.valid_end = NULL;
905 entry_ex->entry.pw_end = NULL;
906
907 } else {
908 NTTIME must_change_time
909 = samdb_result_force_password_change(kdc_db_ctx->samdb, mem_ctx,
910 realm_dn, msg);
911 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
912 entry_ex->entry.pw_end = NULL;
913 } else {
914 entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
915 if (entry_ex->entry.pw_end == NULL) {
916 ret = ENOMEM;
917 goto out;
918 }
919 *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
920 }
921
922 acct_expiry = samdb_result_account_expires(msg);
923 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
924 entry_ex->entry.valid_end = NULL;
925 } else {
926 entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
927 if (entry_ex->entry.valid_end == NULL) {
928 ret = ENOMEM;
929 goto out;
930 }
931 *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
932 }
933 }
934
935 entry_ex->entry.valid_start = NULL;
936
937 entry_ex->entry.max_life = malloc(sizeof(*entry_ex->entry.max_life));
938 if (entry_ex->entry.max_life == NULL) {
939 ret = ENOMEM;
940 goto out;
941 }
942
943 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
944 *entry_ex->entry.max_life = kdc_db_ctx->policy.svc_tkt_lifetime;
945 } else if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT || ent_type == SAMBA_KDC_ENT_TYPE_CLIENT) {
946 *entry_ex->entry.max_life = kdc_db_ctx->policy.usr_tkt_lifetime;
947 } else {
948 *entry_ex->entry.max_life = MIN(kdc_db_ctx->policy.svc_tkt_lifetime,
949 kdc_db_ctx->policy.usr_tkt_lifetime);
950 }
951
952 entry_ex->entry.max_renew = malloc(sizeof(*entry_ex->entry.max_life));
953 if (entry_ex->entry.max_renew == NULL) {
954 ret = ENOMEM;
955 goto out;
956 }
957
958 *entry_ex->entry.max_renew = kdc_db_ctx->policy.renewal_lifetime;
959
960 /* Get keys from the db */
961 ret = samba_kdc_message2entry_keys(context, kdc_db_ctx, p, msg,
962 rid, is_rodc, userAccountControl,
963 ent_type, entry_ex);
964 if (ret) {
965 /* Could be bougus data in the entry, or out of memory */
966 goto out;
967 }
968
969 entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
970 if (entry_ex->entry.etypes == NULL) {
971 krb5_clear_error_message(context);
972 ret = ENOMEM;
973 goto out;
974 }
975 entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
976 entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
977 if (entry_ex->entry.etypes->val == NULL) {
978 krb5_clear_error_message(context);
979 ret = ENOMEM;
980 goto out;
981 }
982 for (i=0; i < entry_ex->entry.etypes->len; i++) {
983 entry_ex->entry.etypes->val[i] = KRB5_KEY_TYPE(&entry_ex->entry.keys.val[i].key);
984 }
985
986
987 p->msg = talloc_steal(p, msg);
988
989 out:
990 if (ret != 0) {
991 /* This doesn't free ent itself, that is for the eventual caller to do */
992 hdb_free_entry(context, entry_ex);
993 ZERO_STRUCTP(entry_ex);
994 } else {
995 talloc_steal(kdc_db_ctx, entry_ex->ctx);
996 }
997
998 return ret;
999 }
1000
1001 /*
1002 * Construct an hdb_entry from a directory entry.
1003 * The kvno is what the remote client asked for
1004 */
1005 static krb5_error_code samba_kdc_trust_message2entry(krb5_context context,
1006 struct samba_kdc_db_context *kdc_db_ctx,
1007 TALLOC_CTX *mem_ctx, krb5_const_principal principal,
1008 enum trust_direction direction,
1009 struct ldb_dn *realm_dn,
1010 unsigned flags,
1011 uint32_t kvno,
1012 struct ldb_message *msg,
1013 hdb_entry_ex *entry_ex)
1014 {
1015 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1016 const char *our_realm = lpcfg_realm(lp_ctx);
1017 const char *dnsdomain = NULL;
1018 char *partner_realm = NULL;
1019 const char *realm = NULL;
1020 const char *krbtgt_realm = NULL;
1021 DATA_BLOB password_utf16 = data_blob_null;
1022 DATA_BLOB password_utf8 = data_blob_null;
1023 struct samr_Password _password_hash;
1024 const struct samr_Password *password_hash = NULL;
1025 const struct ldb_val *password_val;
1026 struct trustAuthInOutBlob password_blob;
1027 struct samba_kdc_entry *p;
1028 bool use_previous = false;
1029 uint32_t current_kvno;
1030 uint32_t previous_kvno;
1031 uint32_t num_keys = 0;
1032 enum ndr_err_code ndr_err;
1033 int ret, trust_direction_flags;
1034 unsigned int i;
1035 struct AuthenticationInformationArray *auth_array;
1036 struct timeval tv;
1037 NTTIME an_hour_ago;
1038 uint32_t *auth_kvno;
1039 bool preferr_current = false;
1040 uint32_t supported_enctypes = ENC_RC4_HMAC_MD5;
1041
1042 if (dsdb_functional_level(kdc_db_ctx->samdb) >= DS_DOMAIN_FUNCTION_2008) {
1043 supported_enctypes = ldb_msg_find_attr_as_uint(msg,
1044 "msDS-SupportedEncryptionTypes",
1045 supported_enctypes);
1046 }
1047
1048 trust_direction_flags = ldb_msg_find_attr_as_int(msg, "trustDirection", 0);
1049 if (!(trust_direction_flags & direction)) {
1050 krb5_clear_error_message(context);
1051 ret = HDB_ERR_NOENTRY;
1052 goto out;
1053 }
1054
1055 dnsdomain = ldb_msg_find_attr_as_string(msg, "trustPartner", NULL);
1056 if (dnsdomain == NULL) {
1057 krb5_clear_error_message(context);
1058 ret = HDB_ERR_NOENTRY;
1059 goto out;
1060 }
1061 partner_realm = strupper_talloc(mem_ctx, dnsdomain);
1062 if (partner_realm == NULL) {
1063 krb5_clear_error_message(context);
1064 ret = ENOMEM;
1065 goto out;
1066 }
1067
1068 if (direction == INBOUND) {
1069 realm = our_realm;
1070 krbtgt_realm = partner_realm;
1071
1072 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
1073 } else { /* OUTBOUND */
1074 realm = partner_realm;
1075 krbtgt_realm = our_realm;
1076
1077 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
1078 }
1079
1080 if (password_val == NULL) {
1081 krb5_clear_error_message(context);
1082 ret = HDB_ERR_NOENTRY;
1083 goto out;
1084 }
1085
1086 ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, &password_blob,
1087 (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
1088 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1089 krb5_clear_error_message(context);
1090 ret = EINVAL;
1091 goto out;
1092 }
1093
1094 p = talloc(mem_ctx, struct samba_kdc_entry);
1095 if (!p) {
1096 ret = ENOMEM;
1097 goto out;
1098 }
1099
1100 p->kdc_db_ctx = kdc_db_ctx;
1101 p->entry_ex = entry_ex;
1102 p->realm_dn = realm_dn;
1103
1104 talloc_set_destructor(p, samba_kdc_entry_destructor);
1105
1106 /* make sure we do not have bogus data in there */
1107 memset(&entry_ex->entry, 0, sizeof(hdb_entry));
1108
1109 entry_ex->ctx = p;
1110 entry_ex->free_entry = samba_kdc_free_entry;
1111
1112 /* use 'whenCreated' */
1113 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
1114 /* use 'kadmin' for now (needed by mit_samba) */
1115 ret = smb_krb5_make_principal(context,
1116 &entry_ex->entry.created_by.principal,
1117 realm, "kadmin", NULL);
1118 if (ret) {
1119 krb5_clear_error_message(context);
1120 goto out;
1121 }
1122
1123 /*
1124 * We always need to generate the canonicalized principal
1125 * with the values of our database.
1126 */
1127 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, realm,
1128 "krbtgt", krbtgt_realm, NULL);
1129 if (ret) {
1130 krb5_clear_error_message(context);
1131 goto out;
1132 }
1133 smb_krb5_principal_set_type(context, entry_ex->entry.principal,
1134 KRB5_NT_SRV_INST);
1135
1136 entry_ex->entry.valid_start = NULL;
1137
1138 /* we need to work out if we are going to use the current or
1139 * the previous password hash.
1140 * We base this on the kvno the client passes in. If the kvno
1141 * passed in is equal to the current kvno in our database then
1142 * we use the current structure. If it is the current kvno-1,
1143 * then we use the previous substrucure.
1144 */
1145
1146 /*
1147 * Windows preferrs the previous key for one hour.
1148 */
1149 tv = timeval_current();
1150 if (tv.tv_sec > 3600) {
1151 tv.tv_sec -= 3600;
1152 }
1153 an_hour_ago = timeval_to_nttime(&tv);
1154
1155 /* first work out the current kvno */
1156 current_kvno = 0;
1157 for (i=0; i < password_blob.count; i++) {
1158 struct AuthenticationInformation *a =
1159 &password_blob.current.array[i];
1160
1161 if (a->LastUpdateTime <= an_hour_ago) {
1162 preferr_current = true;
1163 }
1164
1165 if (a->AuthType == TRUST_AUTH_TYPE_VERSION) {
1166 current_kvno = a->AuthInfo.version.version;
1167 }
1168 }
1169 if (current_kvno == 0) {
1170 previous_kvno = 255;
1171 } else {
1172 previous_kvno = current_kvno - 1;
1173 }
1174 for (i=0; i < password_blob.count; i++) {
1175 struct AuthenticationInformation *a =
1176 &password_blob.previous.array[i];
1177
1178 if (a->AuthType == TRUST_AUTH_TYPE_VERSION) {
1179 previous_kvno = a->AuthInfo.version.version;
1180 }
1181 }
1182
1183 /* work out whether we will use the previous or current
1184 password */
1185 if (password_blob.previous.count == 0) {
1186 /* there is no previous password */
1187 use_previous = false;
1188 } else if (!(flags & HDB_F_KVNO_SPECIFIED)) {
1189 /*
1190 * If not specified we use the lowest kvno
1191 * for the first hour after an update.
1192 */
1193 if (preferr_current) {
1194 use_previous = false;
1195 } else if (previous_kvno < current_kvno) {
1196 use_previous = true;
1197 } else {
1198 use_previous = false;
1199 }
1200 } else if (kvno == current_kvno) {
1201 /*
1202 * Exact match ...
1203 */
1204 use_previous = false;
1205 } else if (kvno == previous_kvno) {
1206 /*
1207 * Exact match ...
1208 */
1209 use_previous = true;
1210 } else {
1211 /*
1212 * Fallback to the current one for anything else
1213 */
1214 use_previous = false;
1215 }
1216
1217 if (use_previous) {
1218 auth_array = &password_blob.previous;
1219 auth_kvno = &previous_kvno;
1220 } else {
1221 auth_array = &password_blob.current;
1222 auth_kvno = &current_kvno;
1223 }
1224
1225 /* use the kvno the client specified, if available */
1226 if (flags & HDB_F_KVNO_SPECIFIED) {
1227 entry_ex->entry.kvno = kvno;
1228 } else {
1229 entry_ex->entry.kvno = *auth_kvno;
1230 }
1231
1232 for (i=0; i < auth_array->count; i++) {
1233 if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
1234 bool ok;
1235
1236 password_utf16 = data_blob_const(auth_array->array[i].AuthInfo.clear.password,
1237 auth_array->array[i].AuthInfo.clear.size);
1238 if (password_utf16.length == 0) {
1239 break;
1240 }
1241
1242 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1243 mdfour(_password_hash.hash, password_utf16.data, password_utf16.length);
1244 if (password_hash == NULL) {
1245 num_keys += 1;
1246 }
1247 password_hash = &_password_hash;
1248 }
1249
1250 if (!(supported_enctypes & (ENC_HMAC_SHA1_96_AES128|ENC_HMAC_SHA1_96_AES256))) {
1251 break;
1252 }
1253
1254 ok = convert_string_talloc(mem_ctx,
1255 CH_UTF16MUNGED, CH_UTF8,
1256 password_utf16.data,
1257 password_utf16.length,
1258 (void *)&password_utf8.data,
1259 &password_utf8.length);
1260 if (!ok) {
1261 krb5_clear_error_message(context);
1262 ret = ENOMEM;
1263 goto out;
1264 }
1265
1266 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1267 num_keys += 1;
1268 }
1269 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1270 num_keys += 1;
1271 }
1272 break;
1273 } else if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
1274 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1275 password_hash = &auth_array->array[i].AuthInfo.nt4owf.password;
1276 num_keys += 1;
1277 }
1278 }
1279 }
1280
1281 /* Must have found a cleartext or MD4 password */
1282 if (num_keys == 0) {
1283 DEBUG(1,(__location__ ": no usable key found\n"));
1284 krb5_clear_error_message(context);
1285 ret = HDB_ERR_NOENTRY;
1286 goto out;
1287 }
1288
1289 entry_ex->entry.keys.val = calloc(num_keys, sizeof(Key));
1290 if (entry_ex->entry.keys.val == NULL) {
1291 krb5_clear_error_message(context);
1292 ret = ENOMEM;
1293 goto out;
1294 }
1295
1296 if (password_utf8.length != 0) {
1297 Key key = {};
1298 krb5_const_principal salt_principal = entry_ex->entry.principal;
1299 krb5_data salt;
1300 krb5_data cleartext_data;
1301
1302 cleartext_data.data = password_utf8.data;
1303 cleartext_data.length = password_utf8.length;
1304
1305 ret = smb_krb5_get_pw_salt(context,
1306 salt_principal,
1307 &salt);
1308 if (ret != 0) {
1309 goto out;
1310 }
1311
1312 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1313 ret = smb_krb5_create_key_from_string(context,
1314 salt_principal,
1315 &salt,
1316 &cleartext_data,
1317 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
1318 &key.key);
1319 if (ret != 0) {
1320 kerberos_free_data_contents(context, &salt);
1321 goto out;
1322 }
1323
1324 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1325 entry_ex->entry.keys.len++;
1326 }
1327
1328 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1329 ret = smb_krb5_create_key_from_string(context,
1330 salt_principal,
1331 &salt,
1332 &cleartext_data,
1333 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
1334 &key.key);
1335 if (ret != 0) {
1336 kerberos_free_data_contents(context, &salt);
1337 goto out;
1338 }
1339
1340 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1341 entry_ex->entry.keys.len++;
1342 }
1343
1344 kerberos_free_data_contents(context, &salt);
1345 }
1346
1347 if (password_hash != NULL) {
1348 Key key = {};
1349
1350 ret = smb_krb5_keyblock_init_contents(context,
1351 ENCTYPE_ARCFOUR_HMAC,
1352 password_hash->hash,
1353 sizeof(password_hash->hash),
1354 &key.key);
1355 if (ret != 0) {
1356 goto out;
1357 }
1358
1359 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1360 entry_ex->entry.keys.len++;
1361 }
1362
1363 entry_ex->entry.flags = int2HDBFlags(0);
1364 entry_ex->entry.flags.immutable = 1;
1365 entry_ex->entry.flags.invalid = 0;
1366 entry_ex->entry.flags.server = 1;
1367 entry_ex->entry.flags.require_preauth = 1;
1368
1369 entry_ex->entry.pw_end = NULL;
1370
1371 entry_ex->entry.max_life = NULL;
1372
1373 entry_ex->entry.max_renew = NULL;
1374
1375 entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
1376 if (entry_ex->entry.etypes == NULL) {
1377 krb5_clear_error_message(context);
1378 ret = ENOMEM;
1379 goto out;
1380 }
1381 entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
1382 entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
1383 if (entry_ex->entry.etypes->val == NULL) {
1384 krb5_clear_error_message(context);
1385 ret = ENOMEM;
1386 goto out;
1387 }
1388 for (i=0; i < entry_ex->entry.etypes->len; i++) {
1389 entry_ex->entry.etypes->val[i] = KRB5_KEY_TYPE(&entry_ex->entry.keys.val[i].key);
1390 }
1391
1392 p->msg = talloc_steal(p, msg);
1393
1394 out:
1395 TALLOC_FREE(partner_realm);
1396
1397 if (ret != 0) {
1398 /* This doesn't free ent itself, that is for the eventual caller to do */
1399 hdb_free_entry(context, entry_ex);
1400 } else {
1401 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1402 }
1403
1404 return ret;
1405
1406 }
1407
1408 static krb5_error_code samba_kdc_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
1409 TALLOC_CTX *mem_ctx,
1410 const char *realm,
1411 struct ldb_dn *realm_dn,
1412 struct ldb_message **pmsg)
1413 {
1414 NTSTATUS status;
1415 const char * const *attrs = trust_attrs;
1416
1417 status = dsdb_trust_search_tdo(ldb_ctx, realm, realm,
1418 attrs, mem_ctx, pmsg);
1419 if (NT_STATUS_IS_OK(status)) {
1420 return 0;
1421 } else if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1422 return HDB_ERR_NOENTRY;
1423 } else if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1424 int ret = ENOMEM;
1425 krb5_set_error_message(context, ret, "get_sam_result_trust: out of memory");
1426 return ret;
1427 } else {
1428 int ret = EINVAL;
1429 krb5_set_error_message(context, ret, "get_sam_result_trust: %s", nt_errstr(status));
1430 return ret;
1431 }
1432 }
1433
1434 static krb5_error_code samba_kdc_lookup_client(krb5_context context,
1435 struct samba_kdc_db_context *kdc_db_ctx,
1436 TALLOC_CTX *mem_ctx,
1437 krb5_const_principal principal,
1438 const char **attrs,
1439 struct ldb_dn **realm_dn,
1440 struct ldb_message **msg)
1441 {
1442 NTSTATUS nt_status;
1443 char *principal_string = NULL;
1444
1445 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1446 principal_string = smb_krb5_principal_get_comp_string(mem_ctx, context,
1447 principal, 0);
1448 if (principal_string == NULL) {
1449 return ENOMEM;
1450 }
1451 } else {
1452 char *principal_string_m = NULL;
1453 krb5_error_code ret;
1454
1455 ret = krb5_unparse_name(context, principal, &principal_string_m);
1456 if (ret != 0) {
1457 return ret;
1458 }
1459
1460 principal_string = talloc_strdup(mem_ctx, principal_string_m);
1461 SAFE_FREE(principal_string_m);
1462 if (principal_string == NULL) {
1463 return ENOMEM;
1464 }
1465 }
1466
1467 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1468 mem_ctx, principal_string, attrs,
1469 realm_dn, msg);
1470 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1471 krb5_principal fallback_principal = NULL;
1472 unsigned int num_comp;
1473 char *fallback_realm = NULL;
1474 char *fallback_account = NULL;
1475 krb5_error_code ret;
1476
1477 ret = krb5_parse_name(context, principal_string,
1478 &fallback_principal);
1479 TALLOC_FREE(principal_string);
1480 if (ret != 0) {
1481 return ret;
1482 }
1483
1484 num_comp = krb5_princ_size(context, fallback_principal);
1485 fallback_realm = smb_krb5_principal_get_realm(context,
1486 fallback_principal);
1487 if (fallback_realm == NULL) {
1488 krb5_free_principal(context, fallback_principal);
1489 return ENOMEM;
1490 }
1491
1492 if (num_comp == 1) {
1493 size_t len;
1494
1495 fallback_account = smb_krb5_principal_get_comp_string(mem_ctx,
1496 context, fallback_principal, 0);
1497 if (fallback_account == NULL) {
1498 krb5_free_principal(context, fallback_principal);
1499 SAFE_FREE(fallback_realm);
1500 return ENOMEM;
1501 }
1502
1503 len = strlen(fallback_account);
1504 if (len >= 2 && fallback_account[len - 1] == '$') {
1505 TALLOC_FREE(fallback_account);
1506 }
1507 }
1508 krb5_free_principal(context, fallback_principal);
1509 fallback_principal = NULL;
1510
1511 if (fallback_account != NULL) {
1512 char *with_dollar;
1513
1514 with_dollar = talloc_asprintf(mem_ctx, "%s$",
1515 fallback_account);
1516 if (with_dollar == NULL) {
1517 SAFE_FREE(fallback_realm);
1518 return ENOMEM;
1519 }
1520 TALLOC_FREE(fallback_account);
1521
1522 ret = smb_krb5_make_principal(context,
1523 &fallback_principal,
1524 fallback_realm,
1525 with_dollar, NULL);
1526 TALLOC_FREE(with_dollar);
1527 if (ret != 0) {
1528 SAFE_FREE(fallback_realm);
1529 return ret;
1530 }
1531 }
1532 SAFE_FREE(fallback_realm);
1533
1534 if (fallback_principal != NULL) {
1535 char *fallback_string = NULL;
1536
1537 ret = krb5_unparse_name(context,
1538 fallback_principal,
1539 &fallback_string);
1540 if (ret != 0) {
1541 krb5_free_principal(context, fallback_principal);
1542 return ret;
1543 }
1544
1545 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1546 mem_ctx,
1547 fallback_string,
1548 attrs,
1549 realm_dn, msg);
1550 SAFE_FREE(fallback_string);
1551 }
1552 krb5_free_principal(context, fallback_principal);
1553 fallback_principal = NULL;
1554 }
1555 TALLOC_FREE(principal_string);
1556
1557 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1558 return HDB_ERR_NOENTRY;
1559 } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1560 return ENOMEM;
1561 } else if (!NT_STATUS_IS_OK(nt_status)) {
1562 return EINVAL;
1563 }
1564
1565 return 0;
1566 }
1567
1568 static krb5_error_code samba_kdc_fetch_client(krb5_context context,
1569 struct samba_kdc_db_context *kdc_db_ctx,
1570 TALLOC_CTX *mem_ctx,
1571 krb5_const_principal principal,
1572 unsigned flags,
1573 hdb_entry_ex *entry_ex) {
1574 struct ldb_dn *realm_dn;
1575 krb5_error_code ret;
1576 struct ldb_message *msg = NULL;
1577
1578 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1579 mem_ctx, principal, user_attrs,
1580 &realm_dn, &msg);
1581 if (ret != 0) {
1582 return ret;
1583 }
1584
1585 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1586 principal, SAMBA_KDC_ENT_TYPE_CLIENT,
1587 flags,
1588 realm_dn, msg, entry_ex);
1589 return ret;
1590 }
1591
1592 static krb5_error_code samba_kdc_fetch_krbtgt(krb5_context context,
1593 struct samba_kdc_db_context *kdc_db_ctx,
1594 TALLOC_CTX *mem_ctx,
1595 krb5_const_principal principal,
1596 unsigned flags,
1597 uint32_t kvno,
1598 hdb_entry_ex *entry_ex)
1599 {
1600 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1601 krb5_error_code ret;
1602 struct ldb_message *msg = NULL;
1603 struct ldb_dn *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1604 char *realm_from_princ, *realm_from_princ_malloc;
1605 char *realm_princ_comp = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 1);
1606
1607 realm_from_princ_malloc = smb_krb5_principal_get_realm(context, principal);
1608 if (realm_from_princ_malloc == NULL) {
1609 /* can't happen */
1610 return HDB_ERR_NOENTRY;
1611 }
1612 realm_from_princ = talloc_strdup(mem_ctx, realm_from_princ_malloc);
1613 free(realm_from_princ_malloc);
1614 if (realm_from_princ == NULL) {
1615 return HDB_ERR_NOENTRY;
1616 }
1617
1618 if (krb5_princ_size(context, principal) != 2
1619 || (principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME) != 0)) {
1620 /* Not a krbtgt */
1621 return HDB_ERR_NOENTRY;
1622 }
1623
1624 /* krbtgt case. Either us or a trusted realm */
1625
1626 if (lpcfg_is_my_domain_or_realm(lp_ctx, realm_from_princ)
1627 && lpcfg_is_my_domain_or_realm(lp_ctx, realm_princ_comp)) {
1628 /* us, or someone quite like us */
1629 /* Cludge, cludge cludge. If the realm part of krbtgt/realm,
1630 * is in our db, then direct the caller at our primary
1631 * krbtgt */
1632
1633 int lret;
1634 unsigned int krbtgt_number;
1635 /* w2k8r2 sometimes gives us a kvno of 255 for inter-domain
1636 trust tickets. We don't yet know what this means, but we do
1637 seem to need to treat it as unspecified */
1638 if (flags & HDB_F_KVNO_SPECIFIED) {
1639 krbtgt_number = SAMBA_KVNO_GET_KRBTGT(kvno);
1640 if (kdc_db_ctx->rodc) {
1641 if (krbtgt_number != kdc_db_ctx->my_krbtgt_number) {
1642 return HDB_ERR_NOT_FOUND_HERE;
1643 }
1644 }
1645 } else {
1646 krbtgt_number = kdc_db_ctx->my_krbtgt_number;
1647 }
1648
1649 if (krbtgt_number == kdc_db_ctx->my_krbtgt_number) {
1650 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1651 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
1652 krbtgt_attrs, DSDB_SEARCH_NO_GLOBAL_CATALOG,
1653 "(objectClass=user)");
1654 } else {
1655 /* We need to look up an RODC krbtgt (perhaps
1656 * ours, if we are an RODC, perhaps another
1657 * RODC if we are a read-write DC */
1658 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1659 &msg, realm_dn, LDB_SCOPE_SUBTREE,
1660 krbtgt_attrs,
1661 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1662 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=%u))", (unsigned)(krbtgt_number));
1663 }
1664
1665 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1666 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1667 (unsigned)(krbtgt_number));
1668 krb5_set_error_message(context, HDB_ERR_NOENTRY,
1669 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1670 (unsigned)(krbtgt_number));
1671 return HDB_ERR_NOENTRY;
1672 } else if (lret != LDB_SUCCESS) {
1673 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1674 (unsigned)(krbtgt_number));
1675 krb5_set_error_message(context, HDB_ERR_NOENTRY,
1676 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1677 (unsigned)(krbtgt_number));
1678 return HDB_ERR_NOENTRY;
1679 }
1680
1681 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1682 principal, SAMBA_KDC_ENT_TYPE_KRBTGT,
1683 flags, realm_dn, msg, entry_ex);
1684 if (ret != 0) {
1685 krb5_warnx(context, "samba_kdc_fetch: self krbtgt message2entry failed");
1686 }
1687 return ret;
1688
1689 } else {
1690 enum trust_direction direction = UNKNOWN;
1691 const char *realm = NULL;
1692
1693 /* Either an inbound or outbound trust */
1694
1695 if (strcasecmp(lpcfg_realm(lp_ctx), realm_from_princ) == 0) {
1696 /* look for inbound trust */
1697 direction = INBOUND;
1698 realm = realm_princ_comp;
1699 } else if (principal_comp_strcasecmp(context, principal, 1, lpcfg_realm(lp_ctx)) == 0) {
1700 /* look for outbound trust */
1701 direction = OUTBOUND;
1702 realm = realm_from_princ;
1703 } else {
1704 krb5_warnx(context, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1705 realm_from_princ,
1706 realm_princ_comp);
1707 krb5_set_error_message(context, HDB_ERR_NOENTRY, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1708 realm_from_princ,
1709 realm_princ_comp);
1710 return HDB_ERR_NOENTRY;
1711 }
1712
1713 /* Trusted domains are under CN=system */
1714
1715 ret = samba_kdc_lookup_trust(context, kdc_db_ctx->samdb,
1716 mem_ctx,
1717 realm, realm_dn, &msg);
1718
1719 if (ret != 0) {
1720 krb5_warnx(context, "samba_kdc_fetch: could not find principal in DB");
1721 krb5_set_error_message(context, ret, "samba_kdc_fetch: could not find principal in DB");
1722 return ret;
1723 }
1724
1725 ret = samba_kdc_trust_message2entry(context, kdc_db_ctx, mem_ctx,
1726 principal, direction,
1727 realm_dn, flags, kvno, msg, entry_ex);
1728 if (ret != 0) {
1729 krb5_warnx(context, "samba_kdc_fetch: trust_message2entry failed for %s",
1730 ldb_dn_get_linearized(msg->dn));
1731 krb5_set_error_message(context, ret, "samba_kdc_fetch: "
1732 "trust_message2entry failed for %s",
1733 ldb_dn_get_linearized(msg->dn));
1734 }
1735 return ret;
1736 }
1737
1738 }
1739
1740 static krb5_error_code samba_kdc_lookup_server(krb5_context context,
1741 struct samba_kdc_db_context *kdc_db_ctx,
1742 TALLOC_CTX *mem_ctx,
1743 krb5_const_principal principal,
1744 unsigned flags,
1745 const char **attrs,
1746 struct ldb_dn **realm_dn,
1747 struct ldb_message **msg)
1748 {
1749 krb5_error_code ret;
1750 if ((smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL)
1751 && krb5_princ_size(context, principal) >= 2) {
1752 /* 'normal server' case */
1753 int ldb_ret;
1754 NTSTATUS nt_status;
1755 struct ldb_dn *user_dn;
1756 char *principal_string;
1757
1758 ret = krb5_unparse_name_flags(context, principal,
1759 KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1760 &principal_string);
1761 if (ret != 0) {
1762 return ret;
1763 }
1764
1765 /* At this point we may find the host is known to be
1766 * in a different realm, so we should generate a
1767 * referral instead */
1768 nt_status = crack_service_principal_name(kdc_db_ctx->samdb,
1769 mem_ctx, principal_string,
1770 &user_dn, realm_dn);
1771 free(principal_string);
1772
1773 if (!NT_STATUS_IS_OK(nt_status)) {
1774 return HDB_ERR_NOENTRY;
1775 }
1776
1777 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb,
1778 mem_ctx,
1779 msg, user_dn, LDB_SCOPE_BASE,
1780 attrs,
1781 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1782 "(objectClass=*)");
1783 if (ldb_ret != LDB_SUCCESS) {
1784 return HDB_ERR_NOENTRY;
1785 }
1786 return 0;
1787 } else if (!(flags & HDB_F_FOR_AS_REQ)
1788 && smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1789 /*
1790 * The behaviour of accepting an
1791 * KRB5_NT_ENTERPRISE_PRINCIPAL server principal
1792 * containing a UPN only applies to TGS-REQ packets,
1793 * not AS-REQ packets.
1794 */
1795 return samba_kdc_lookup_client(context, kdc_db_ctx,
1796 mem_ctx, principal, attrs,
1797 realm_dn, msg);
1798 } else {
1799 /*
1800 * This case is for:
1801 * - the AS-REQ, where we only accept
1802 * samAccountName based lookups for the server, no
1803 * matter if the name is an
1804 * KRB5_NT_ENTERPRISE_PRINCIPAL or not
1805 * - for the TGS-REQ when we are not given an
1806 * KRB5_NT_ENTERPRISE_PRINCIPAL, which also must
1807 * only lookup samAccountName based names.
1808 */
1809 int lret;
1810 char *short_princ;
1811 krb5_principal enterprise_principal = NULL;
1812 krb5_const_principal used_principal = NULL;
1813 char *name1 = NULL;
1814 size_t len1 = 0;
1815 char *filter = NULL;
1816
1817 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1818 char *str = NULL;
1819 /* Need to reparse the enterprise principal to find the real target */
1820 if (krb5_princ_size(context, principal) != 1) {
1821 ret = KRB5_PARSE_MALFORMED;
1822 krb5_set_error_message(context, ret, "samba_kdc_lookup_server: request for an "
1823 "enterprise principal with wrong (%d) number of components",
1824 krb5_princ_size(context, principal));
1825 return ret;
1826 }
1827 str = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 0);
1828 if (str == NULL) {
1829 return KRB5_PARSE_MALFORMED;
1830 }
1831 ret = krb5_parse_name(context, str,
1832 &enterprise_principal);
1833 talloc_free(str);
1834 if (ret) {
1835 return ret;
1836 }
1837 used_principal = enterprise_principal;
1838 } else {
1839 used_principal = principal;
1840 }
1841
1842 /* server as client principal case, but we must not lookup userPrincipalNames */
1843 *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1844
1845 /* TODO: Check if it is our realm, otherwise give referral */
1846
1847 ret = krb5_unparse_name_flags(context, used_principal,
1848 KRB5_PRINCIPAL_UNPARSE_NO_REALM |
1849 KRB5_PRINCIPAL_UNPARSE_DISPLAY,
1850 &short_princ);
1851 used_principal = NULL;
1852 krb5_free_principal(context, enterprise_principal);
1853 enterprise_principal = NULL;
1854
1855 if (ret != 0) {
1856 krb5_set_error_message(context, ret, "samba_kdc_lookup_principal: could not parse principal");
1857 krb5_warnx(context, "samba_kdc_lookup_principal: could not parse principal");
1858 return ret;
1859 }
1860
1861 name1 = ldb_binary_encode_string(mem_ctx, short_princ);
1862 SAFE_FREE(short_princ);
1863 if (name1 == NULL) {
1864 return ENOMEM;
1865 }
1866 len1 = strlen(name1);
1867 if (len1 >= 1 && name1[len1 - 1] != '$') {
1868 filter = talloc_asprintf(mem_ctx,
1869 "(&(objectClass=user)(|(samAccountName=%s)(samAccountName=%s$)))",
1870 name1, name1);
1871 if (filter == NULL) {
1872 return ENOMEM;
1873 }
1874 } else {
1875 filter = talloc_asprintf(mem_ctx,
1876 "(&(objectClass=user)(samAccountName=%s))",
1877 name1);
1878 if (filter == NULL) {
1879 return ENOMEM;
1880 }
1881 }
1882
1883 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx, msg,
1884 *realm_dn, LDB_SCOPE_SUBTREE,
1885 attrs,
1886 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1887 "%s", filter);
1888 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1889 DEBUG(10, ("Failed to find an entry for %s filter:%s\n",
1890 name1, filter));
1891 return HDB_ERR_NOENTRY;
1892 }
1893 if (lret == LDB_ERR_CONSTRAINT_VIOLATION) {
1894 DEBUG(10, ("Failed to find unique entry for %s filter:%s\n",
1895 name1, filter));
1896 return HDB_ERR_NOENTRY;
1897 }
1898 if (lret != LDB_SUCCESS) {
1899 DEBUG(0, ("Failed single search for %s - %s\n",
1900 name1, ldb_errstring(kdc_db_ctx->samdb)));
1901 return HDB_ERR_NOENTRY;
1902 }
1903 return 0;
1904 }
1905 return HDB_ERR_NOENTRY;
1906 }
1907
1908
1909
1910 static krb5_error_code samba_kdc_fetch_server(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 hdb_entry_ex *entry_ex)
1916 {
1917 krb5_error_code ret;
1918 struct ldb_dn *realm_dn;
1919 struct ldb_message *msg;
1920
1921 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, principal,
1922 flags, server_attrs, &realm_dn, &msg);
1923 if (ret != 0) {
1924 return ret;
1925 }
1926
1927 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1928 principal, SAMBA_KDC_ENT_TYPE_SERVER,
1929 flags,
1930 realm_dn, msg, entry_ex);
1931 if (ret != 0) {
1932 krb5_warnx(context, "samba_kdc_fetch: message2entry failed");
1933 }
1934
1935 return ret;
1936 }
1937
1938 static krb5_error_code samba_kdc_lookup_realm(krb5_context context,
1939 struct samba_kdc_db_context *kdc_db_ctx,
1940 TALLOC_CTX *mem_ctx,
1941 krb5_const_principal principal,
1942 unsigned flags,
1943 hdb_entry_ex *entry_ex)
1944 {
1945 TALLOC_CTX *frame = talloc_stackframe();
1946 NTSTATUS status;
1947 krb5_error_code ret;
1948 char *_realm = NULL;
1949 bool check_realm = false;
1950 const char *realm = NULL;
1951 struct dsdb_trust_routing_table *trt = NULL;
1952 const struct lsa_TrustDomainInfoInfoEx *tdo = NULL;
1953 unsigned int num_comp;
1954 bool ok;
1955 char *upper = NULL;
1956
1957 num_comp = krb5_princ_size(context, principal);
1958
1959 if (flags & HDB_F_GET_CLIENT) {
1960 if (flags & HDB_F_FOR_AS_REQ) {
1961 check_realm = true;
1962 }
1963 }
1964 if (flags & HDB_F_GET_SERVER) {
1965 if (flags & HDB_F_FOR_TGS_REQ) {
1966 check_realm = true;
1967 }
1968 }
1969
1970 if (!check_realm) {
1971 TALLOC_FREE(frame);
1972 return 0;
1973 }
1974
1975 _realm = smb_krb5_principal_get_realm(context, principal);
1976 if (_realm == NULL) {
1977 TALLOC_FREE(frame);
1978 return ENOMEM;
1979 }
1980
1981 /*
1982 * The requested realm needs to be our own
1983 */
1984 ok = lpcfg_is_my_domain_or_realm(kdc_db_ctx->lp_ctx, _realm);
1985 if (!ok) {
1986 /*
1987 * The request is not for us...
1988 */
1989 SAFE_FREE(_realm);
1990 TALLOC_FREE(frame);
1991 return HDB_ERR_NOENTRY;
1992 }
1993
1994 realm = talloc_strdup(frame, _realm);
1995 SAFE_FREE(_realm);
1996 if (realm == NULL) {
1997 TALLOC_FREE(frame);
1998 return ENOMEM;
1999 }
2000
2001 if (krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
2002 char *principal_string = NULL;
2003 krb5_principal enterprise_principal = NULL;
2004 char *enterprise_realm = NULL;
2005
2006 if (num_comp != 1) {
2007 TALLOC_FREE(frame);
2008 return HDB_ERR_NOENTRY;
2009 }
2010
2011 principal_string = smb_krb5_principal_get_comp_string(frame, context,
2012 principal, 0);
2013 if (principal_string == NULL) {
2014 TALLOC_FREE(frame);
2015 return ENOMEM;
2016 }
2017
2018 ret = krb5_parse_name(context, principal_string,
2019 &enterprise_principal);
2020 TALLOC_FREE(principal_string);
2021 if (ret) {
2022 TALLOC_FREE(frame);
2023 return ret;
2024 }
2025
2026 enterprise_realm = smb_krb5_principal_get_realm(context,
2027 enterprise_principal);
2028 krb5_free_principal(context, enterprise_principal);
2029 if (enterprise_realm != NULL) {
2030 realm = talloc_strdup(frame, enterprise_realm);
2031 SAFE_FREE(enterprise_realm);
2032 if (realm == NULL) {
2033 TALLOC_FREE(frame);
2034 return ENOMEM;
2035 }
2036 }
2037 }
2038
2039 if (flags & HDB_F_GET_SERVER) {
2040 char *service_realm = NULL;
2041
2042 ret = principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME);
2043 if (ret == 0) {
2044 /*
2045 * we need to search krbtgt/ locally
2046 */
2047 TALLOC_FREE(frame);
2048 return 0;
2049 }
2050
2051 /*
2052 * We need to check the last component against the routing table.
2053 *
2054 * Note this works only with 2 or 3 component principals, e.g:
2055 *
2056 * servicePrincipalName: ldap/W2K8R2-219.bla.base
2057 * servicePrincipalName: ldap/W2K8R2-219.bla.base/bla.base
2058 * servicePrincipalName: ldap/W2K8R2-219.bla.base/ForestDnsZones.bla.base
2059 * servicePrincipalName: ldap/W2K8R2-219.bla.base/DomainDnsZones.bla.base
2060 */
2061
2062 if (num_comp == 2 || num_comp == 3) {
2063 service_realm = smb_krb5_principal_get_comp_string(frame,
2064 context,
2065 principal,
2066 num_comp - 1);
2067 }
2068
2069 if (service_realm != NULL) {
2070 realm = service_realm;
2071 }
2072 }
2073
2074 ok = lpcfg_is_my_domain_or_realm(kdc_db_ctx->lp_ctx, realm);
2075 if (ok) {
2076 /*
2077 * skip the expensive routing lookup
2078 */
2079 TALLOC_FREE(frame);
2080 return 0;
2081 }
2082
2083 status = dsdb_trust_routing_table_load(kdc_db_ctx->samdb,
2084 frame, &trt);
2085 if (!NT_STATUS_IS_OK(status)) {
2086 TALLOC_FREE(frame);
2087 return EINVAL;
2088 }
2089
2090 tdo = dsdb_trust_routing_by_name(trt, realm);
2091 if (tdo == NULL) {
2092 /*
2093 * This principal has to be local
2094 */
2095 TALLOC_FREE(frame);
2096 return 0;
2097 }
2098
2099 if (tdo->trust_attributes & LSA_TRUST_ATTRIBUTE_WITHIN_FOREST) {
2100 /*
2101 * TODO: handle the routing within the forest
2102 *
2103 * This should likely be handled in
2104 * samba_kdc_message2entry() in case we're
2105 * a global catalog. We'd need to check
2106 * if realm_dn is our own domain and derive
2107 * the dns domain name from realm_dn and check that
2108 * against the routing table or fallback to
2109 * the tdo we found here.
2110 *
2111 * But for now we don't support multiple domains
2112 * in our forest correctly anyway.
2113 *
2114 * Just search in our local database.
2115 */
2116 TALLOC_FREE(frame);
2117 return 0;
2118 }
2119
2120 ZERO_STRUCT(entry_ex->entry);
2121
2122 ret = krb5_copy_principal(context, principal,
2123 &entry_ex->entry.principal);
2124 if (ret) {
2125 TALLOC_FREE(frame);
2126 return ret;
2127 }
2128
2129 upper = strupper_talloc(frame, tdo->domain_name.string);
2130 if (upper == NULL) {
2131 TALLOC_FREE(frame);
2132 return ENOMEM;
2133 }
2134
2135 ret = krb5_principal_set_realm(context,
2136 entry_ex->entry.principal,
2137 upper);
2138 if (ret) {
2139 TALLOC_FREE(frame);
2140 return ret;
2141 }
2142
2143 TALLOC_FREE(frame);
2144 return HDB_ERR_WRONG_REALM;
2145 }
2146
2147 krb5_error_code samba_kdc_fetch(krb5_context context,
2148 struct samba_kdc_db_context *kdc_db_ctx,
2149 krb5_const_principal principal,
2150 unsigned flags,
2151 krb5_kvno kvno,
2152 hdb_entry_ex *entry_ex)
2153 {
2154 krb5_error_code ret = HDB_ERR_NOENTRY;
2155 TALLOC_CTX *mem_ctx;
2156
2157 mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_fetch context");
2158 if (!mem_ctx) {
2159 ret = ENOMEM;
2160 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2161 return ret;
2162 }
2163
2164 ret = samba_kdc_lookup_realm(context, kdc_db_ctx, mem_ctx,
2165 principal, flags, entry_ex);
2166 if (ret != 0) {
2167 goto done;
2168 }
2169
2170 ret = HDB_ERR_NOENTRY;
2171
2172 if (flags & HDB_F_GET_CLIENT) {
2173 ret = samba_kdc_fetch_client(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
2174 if (ret != HDB_ERR_NOENTRY) goto done;
2175 }
2176 if (flags & HDB_F_GET_SERVER) {
2177 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
2178 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
2179 if (ret != HDB_ERR_NOENTRY) goto done;
2180
2181 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
2182 ret = samba_kdc_fetch_server(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
2183 if (ret != HDB_ERR_NOENTRY) goto done;
2184 }
2185 if (flags & HDB_F_GET_KRBTGT) {
2186 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
2187 if (ret != HDB_ERR_NOENTRY) goto done;
2188 }
2189
2190 done:
2191 talloc_free(mem_ctx);
2192 return ret;
2193 }
2194
2195 struct samba_kdc_seq {
2196 unsigned int index;
2197 unsigned int count;
2198 struct ldb_message **msgs;
2199 struct ldb_dn *realm_dn;
2200 };
2201
2202 static krb5_error_code samba_kdc_seq(krb5_context context,
2203 struct samba_kdc_db_context *kdc_db_ctx,
2204 hdb_entry_ex *entry)
2205 {
2206 krb5_error_code ret;
2207 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
2208 const char *realm = lpcfg_realm(kdc_db_ctx->lp_ctx);
2209 struct ldb_message *msg = NULL;
2210 const char *sAMAccountName = NULL;
2211 krb5_principal principal = NULL;
2212 TALLOC_CTX *mem_ctx;
2213
2214 if (!priv) {
2215 return HDB_ERR_NOENTRY;
2216 }
2217
2218 mem_ctx = talloc_named(priv, 0, "samba_kdc_seq context");
2219
2220 if (!mem_ctx) {
2221 ret = ENOMEM;
2222 krb5_set_error_message(context, ret, "samba_kdc_seq: talloc_named() failed!");
2223 return ret;
2224 }
2225
2226 while (priv->index < priv->count) {
2227 msg = priv->msgs[priv->index++];
2228
2229 sAMAccountName = ldb_msg_find_attr_as_string(msg, "sAMAccountName", NULL);
2230 if (sAMAccountName != NULL) {
2231 break;
2232 }
2233 }
2234
2235 if (sAMAccountName == NULL) {
2236 ret = HDB_ERR_NOENTRY;
2237 goto out;
2238 }
2239
2240 ret = smb_krb5_make_principal(context, &principal,
2241 realm, sAMAccountName, NULL);
2242 if (ret != 0) {
2243 goto out;
2244 }
2245
2246 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
2247 principal, SAMBA_KDC_ENT_TYPE_ANY,
2248 HDB_F_ADMIN_DATA|HDB_F_GET_ANY,
2249 priv->realm_dn, msg, entry);
2250
2251 out:
2252 if (principal != NULL) {
2253 krb5_free_principal(context, principal);
2254 }
2255
2256 if (ret != 0) {
2257 TALLOC_FREE(priv);
2258 kdc_db_ctx->seq_ctx = NULL;
2259 } else {
2260 talloc_free(mem_ctx);
2261 }
2262
2263 return ret;
2264 }
2265
2266 krb5_error_code samba_kdc_firstkey(krb5_context context,
2267 struct samba_kdc_db_context *kdc_db_ctx,
2268 hdb_entry_ex *entry)
2269 {
2270 struct ldb_context *ldb_ctx = kdc_db_ctx->samdb;
2271 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
2272 char *realm;
2273 struct ldb_result *res = NULL;
2274 krb5_error_code ret;
2275 TALLOC_CTX *mem_ctx;
2276 int lret;
2277
2278 if (priv) {
2279 TALLOC_FREE(priv);
2280 kdc_db_ctx->seq_ctx = NULL;
2281 }
2282
2283 priv = (struct samba_kdc_seq *) talloc(kdc_db_ctx, struct samba_kdc_seq);
2284 if (!priv) {
2285 ret = ENOMEM;
2286 krb5_set_error_message(context, ret, "talloc: out of memory");
2287 return ret;
2288 }
2289
2290 priv->index = 0;
2291 priv->msgs = NULL;
2292 priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
2293 priv->count = 0;
2294
2295 mem_ctx = talloc_named(priv, 0, "samba_kdc_firstkey context");
2296
2297 if (!mem_ctx) {
2298 ret = ENOMEM;
2299 krb5_set_error_message(context, ret, "samba_kdc_firstkey: talloc_named() failed!");
2300 return ret;
2301 }
2302
2303 ret = krb5_get_default_realm(context, &realm);
2304 if (ret != 0) {
2305 TALLOC_FREE(priv);
2306 return ret;
2307 }
2308 krb5_free_default_realm(context, realm);
2309
2310 lret = dsdb_search(ldb_ctx, priv, &res,
2311 priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
2312 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2313 "(objectClass=user)");
2314
2315 if (lret != LDB_SUCCESS) {
2316 TALLOC_FREE(priv);
2317 return HDB_ERR_NOENTRY;
2318 }
2319
2320 priv->count = res->count;
2321 priv->msgs = talloc_steal(priv, res->msgs);
2322 talloc_free(res);
2323
2324 kdc_db_ctx->seq_ctx = priv;
2325
2326 ret = samba_kdc_seq(context, kdc_db_ctx, entry);
2327
2328 if (ret != 0) {
2329 TALLOC_FREE(priv);
2330 kdc_db_ctx->seq_ctx = NULL;
2331 } else {
2332 talloc_free(mem_ctx);
2333 }
2334 return ret;
2335 }
2336
2337 krb5_error_code samba_kdc_nextkey(krb5_context context,
2338 struct samba_kdc_db_context *kdc_db_ctx,
2339 hdb_entry_ex *entry)
2340 {
2341 return samba_kdc_seq(context, kdc_db_ctx, entry);
2342 }
2343
2344 /* Check if a given entry may delegate or do s4u2self to this target principal
2345 *
2346 * This is currently a very nasty hack - allowing only delegation to itself.
2347 */
2348 krb5_error_code
2349 samba_kdc_check_s4u2self(krb5_context context,
2350 struct samba_kdc_db_context *kdc_db_ctx,
2351 struct samba_kdc_entry *skdc_entry,
2352 krb5_const_principal target_principal)
2353 {
2354 krb5_error_code ret;
2355 struct ldb_dn *realm_dn;
2356 struct ldb_message *msg;
2357 struct dom_sid *orig_sid;
2358 struct dom_sid *target_sid;
2359 const char *delegation_check_attrs[] = {
2360 "objectSid", NULL
2361 };
2362
2363 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2self");
2364
2365 if (!mem_ctx) {
2366 ret = ENOMEM;
2367 krb5_set_error_message(context, ret, "samba_kdc_check_s4u2self: talloc_named() failed!");
2368 return ret;
2369 }
2370
2371 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, target_principal,
2372 HDB_F_GET_CLIENT|HDB_F_GET_SERVER,
2373 delegation_check_attrs, &realm_dn, &msg);
2374
2375 if (ret != 0) {
2376 talloc_free(mem_ctx);
2377 return ret;
2378 }
2379
2380 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2381 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2382
2383 /* Allow delegation to the same principal, even if by a different
2384 * name. The easy and safe way to prove this is by SID
2385 * comparison */
2386 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2387 talloc_free(mem_ctx);
2388 return KRB5KDC_ERR_BADOPTION;
2389 }
2390
2391 talloc_free(mem_ctx);
2392 return ret;
2393 }
2394
2395 /* Certificates printed by a the Certificate Authority might have a
2396 * slightly different form of the user principal name to that in the
2397 * database. Allow a mismatch where they both refer to the same
2398 * SID */
2399
2400 krb5_error_code
2401 samba_kdc_check_pkinit_ms_upn_match(krb5_context context,
2402 struct samba_kdc_db_context *kdc_db_ctx,
2403 struct samba_kdc_entry *skdc_entry,
2404 krb5_const_principal certificate_principal)
2405 {
2406 krb5_error_code ret;
2407 struct ldb_dn *realm_dn;
2408 struct ldb_message *msg;
2409 struct dom_sid *orig_sid;
2410 struct dom_sid *target_sid;
2411 const char *ms_upn_check_attrs[] = {
2412 "objectSid", NULL
2413 };
2414
2415 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_pkinit_ms_upn_match");
2416
2417 if (!mem_ctx) {
2418 ret = ENOMEM;
2419 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2420 return ret;
2421 }
2422
2423 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
2424 mem_ctx, certificate_principal,
2425 ms_upn_check_attrs, &realm_dn, &msg);
2426
2427 if (ret != 0) {
2428 talloc_free(mem_ctx);
2429 return ret;
2430 }
2431
2432 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2433 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2434
2435 /* Consider these to be the same principal, even if by a different
2436 * name. The easy and safe way to prove this is by SID
2437 * comparison */
2438 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2439 talloc_free(mem_ctx);
2440 #ifdef KRB5_KDC_ERR_CLIENT_NAME_MISMATCH /* Heimdal */
2441 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
2442 #elif defined(KRB5KDC_ERR_CLIENT_NAME_MISMATCH) /* MIT */
2443 return KRB5KDC_ERR_CLIENT_NAME_MISMATCH;
2444 #endif
2445 }
2446
2447 talloc_free(mem_ctx);
2448 return ret;
2449 }
2450
2451 /*
2452 * Check if a given entry may delegate to this target principal
2453 * with S4U2Proxy.
2454 */
2455 krb5_error_code
2456 samba_kdc_check_s4u2proxy(krb5_context context,
2457 struct samba_kdc_db_context *kdc_db_ctx,
2458 struct samba_kdc_entry *skdc_entry,
2459 krb5_const_principal target_principal)
2460 {
2461 krb5_error_code ret;
2462 char *tmp = NULL;
2463 const char *client_dn = NULL;
2464 const char *target_principal_name = NULL;
2465 struct ldb_message_element *el;
2466 struct ldb_val val;
2467 unsigned int i;
2468 bool found = false;
2469
2470 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2proxy");
2471
2472 if (!mem_ctx) {
2473 ret = ENOMEM;
2474 krb5_set_error_message(context, ret,
2475 "samba_kdc_check_s4u2proxy:"
2476 " talloc_named() failed!");
2477 return ret;
2478 }
2479
2480 client_dn = ldb_dn_get_linearized(skdc_entry->msg->dn);
2481 if (!client_dn) {
2482 if (errno == 0) {
2483 errno = ENOMEM;
2484 }
2485 ret = errno;
2486 krb5_set_error_message(context, ret,
2487 "samba_kdc_check_s4u2proxy:"
2488 " ldb_dn_get_linearized() failed!");
2489 return ret;
2490 }
2491
2492 /*
2493 * The main heimdal code already checked that the target_principal
2494 * belongs to the same realm as the client.
2495 *
2496 * So we just need the principal without the realm,
2497 * as that is what is configured in the "msDS-AllowedToDelegateTo"
2498 * attribute.
2499 */
2500 ret = krb5_unparse_name_flags(context, target_principal,
2501 KRB5_PRINCIPAL_UNPARSE_NO_REALM, &tmp);
2502 if (ret) {
2503 talloc_free(mem_ctx);
2504 krb5_set_error_message(context, ret,
2505 "samba_kdc_check_s4u2proxy:"
2506 " krb5_unparse_name() failed!");
2507 return ret;
2508 }
2509 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] for target[%s]\n",
2510 client_dn, tmp));
2511
2512 target_principal_name = talloc_strdup(mem_ctx, tmp);
2513 SAFE_FREE(tmp);
2514 if (target_principal_name == NULL) {
2515 ret = ENOMEM;
2516 krb5_set_error_message(context, ret,
2517 "samba_kdc_check_s4u2proxy:"
2518 " talloc_strdup() failed!");
2519 return ret;
2520 }
2521
2522 el = ldb_msg_find_element(skdc_entry->msg, "msDS-AllowedToDelegateTo");
2523 if (el == NULL) {
2524 goto bad_option;
2525 }
2526
2527 val = data_blob_string_const(target_principal_name);
2528
2529 for (i=0; i<el->num_values; i++) {
2530 struct ldb_val *val1 = &val;
2531 struct ldb_val *val2 = &el->values[i];
2532 int cmp;
2533
2534 if (val1->length != val2->length) {
2535 continue;
2536 }
2537
2538 cmp = strncasecmp((const char *)val1->data,
2539 (const char *)val2->data,
2540 val1->length);
2541 if (cmp != 0) {
2542 continue;
2543 }
2544
2545 found = true;
2546 break;
2547 }
2548
2549 if (!found) {
2550 goto bad_option;
2551 }
2552
2553 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] allowed target[%s]\n",
2554 client_dn, tmp));
2555 talloc_free(mem_ctx);
2556 return 0;
2557
2558 bad_option:
2559 krb5_set_error_message(context, ret,
2560 "samba_kdc_check_s4u2proxy: client[%s] "
2561 "not allowed for delegation to target[%s]",
2562 client_dn,
2563 target_principal_name);
2564 talloc_free(mem_ctx);
2565 return KRB5KDC_ERR_BADOPTION;
2566 }
2567
2568 NTSTATUS samba_kdc_setup_db_ctx(TALLOC_CTX *mem_ctx, struct samba_kdc_base_context *base_ctx,
2569 struct samba_kdc_db_context **kdc_db_ctx_out)
2570 {
2571 int ldb_ret;
2572 struct ldb_message *msg;
2573 struct auth_session_info *session_info;
2574 struct samba_kdc_db_context *kdc_db_ctx;
2575 /* The idea here is very simple. Using Kerberos to
2576 * authenticate the KDC to the LDAP server is higly likely to
2577 * be circular.
2578 *
2579 * In future we may set this up to use EXERNAL and SSL
2580 * certificates, for now it will almost certainly be NTLMSSP_SET_USERNAME
2581 */
2582
2583 kdc_db_ctx = talloc_zero(mem_ctx, struct samba_kdc_db_context);
2584 if (kdc_db_ctx == NULL) {
2585 return NT_STATUS_NO_MEMORY;
2586 }
2587 kdc_db_ctx->ev_ctx = base_ctx->ev_ctx;
2588 kdc_db_ctx->lp_ctx = base_ctx->lp_ctx;
2589
2590 /* get default kdc policy */
2591 lpcfg_default_kdc_policy(base_ctx->lp_ctx,
2592 &kdc_db_ctx->policy.svc_tkt_lifetime,
2593 &kdc_db_ctx->policy.usr_tkt_lifetime,
2594 &kdc_db_ctx->policy.renewal_lifetime);
2595
2596 session_info = system_session(kdc_db_ctx->lp_ctx);
2597 if (session_info == NULL) {
2598 return NT_STATUS_INTERNAL_ERROR;
2599 }
2600
2601 /* Setup the link to LDB */
2602 kdc_db_ctx->samdb = samdb_connect(kdc_db_ctx, base_ctx->ev_ctx,
2603 base_ctx->lp_ctx, session_info, 0);
2604 if (kdc_db_ctx->samdb == NULL) {
2605 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot open samdb for KDC backend!"));
2606 talloc_free(kdc_db_ctx);
2607 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2608 }
2609
2610 /* Find out our own krbtgt kvno */
2611 ldb_ret = samdb_rodc(kdc_db_ctx->samdb, &kdc_db_ctx->rodc);
2612 if (ldb_ret != LDB_SUCCESS) {
2613 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine if we are an RODC in KDC backend: %s\n",
2614 ldb_errstring(kdc_db_ctx->samdb)));
2615 talloc_free(kdc_db_ctx);
2616 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2617 }
2618 if (kdc_db_ctx->rodc) {
2619 int my_krbtgt_number;
2620 const char *secondary_keytab[] = { "msDS-SecondaryKrbTgtNumber", NULL };
2621 struct ldb_dn *account_dn;
2622 struct ldb_dn *server_dn = samdb_server_dn(kdc_db_ctx->samdb, kdc_db_ctx);
2623 if (!server_dn) {
2624 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server DN in KDC backend: %s\n",
2625 ldb_errstring(kdc_db_ctx->samdb)));
2626 talloc_free(kdc_db_ctx);
2627 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2628 }
2629
2630 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, server_dn,
2631 "serverReference", &account_dn);
2632 if (ldb_ret != LDB_SUCCESS) {
2633 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server account in KDC backend: %s\n",
2634 ldb_errstring(kdc_db_ctx->samdb)));
2635 talloc_free(kdc_db_ctx);
2636 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2637 }
2638
2639 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, account_dn,
2640 "msDS-KrbTgtLink", &kdc_db_ctx->krbtgt_dn);
2641 talloc_free(account_dn);
2642 if (ldb_ret != LDB_SUCCESS) {
2643 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine RODC krbtgt account in KDC backend: %s\n",
2644 ldb_errstring(kdc_db_ctx->samdb)));
2645 talloc_free(kdc_db_ctx);
2646 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2647 }
2648
2649 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2650 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
2651 secondary_keytab,
2652 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2653 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=*))");
2654 if (ldb_ret != LDB_SUCCESS) {
2655 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read krbtgt account %s in KDC backend to get msDS-SecondaryKrbTgtNumber: %s: %s\n",
2656 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2657 ldb_errstring(kdc_db_ctx->samdb),
2658 ldb_strerror(ldb_ret)));
2659 talloc_free(kdc_db_ctx);
2660 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2661 }
2662 my_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
2663 if (my_krbtgt_number == -1) {
2664 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read msDS-SecondaryKrbTgtNumber from krbtgt account %s in KDC backend: got %d\n",
2665 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2666 my_krbtgt_number));
2667 talloc_free(kdc_db_ctx);
2668 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2669 }
2670 kdc_db_ctx->my_krbtgt_number = my_krbtgt_number;
2671
2672 } else {
2673 kdc_db_ctx->my_krbtgt_number = 0;
2674 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2675 &msg,
2676 ldb_get_default_basedn(kdc_db_ctx->samdb),
2677 LDB_SCOPE_SUBTREE,
2678 krbtgt_attrs,
2679 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2680 "(&(objectClass=user)(samAccountName=krbtgt))");
2681
2682 if (ldb_ret != LDB_SUCCESS) {
2683 DEBUG(1, ("samba_kdc_fetch: could not find own KRBTGT in DB: %s\n", ldb_errstring(kdc_db_ctx->samdb)));
2684 talloc_free(kdc_db_ctx);
2685 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2686 }
2687 kdc_db_ctx->krbtgt_dn = talloc_steal(kdc_db_ctx, msg->dn);
2688 kdc_db_ctx->my_krbtgt_number = 0;
2689 talloc_free(msg);
2690 }
2691 *kdc_db_ctx_out = kdc_db_ctx;
2692 return NT_STATUS_OK;
2693 }
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