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notifyd: Add notifydd
[Samba.git] / source4 / kdc / db-glue.c
blob92727175209c13ce195e5f314c020b5135ca6636
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 *dnsdomain;
1017 const char *realm = lpcfg_realm(lp_ctx);
1018 DATA_BLOB password_utf16 = data_blob_null;
1019 DATA_BLOB password_utf8 = data_blob_null;
1020 struct samr_Password _password_hash;
1021 const struct samr_Password *password_hash = NULL;
1022 const struct ldb_val *password_val;
1023 struct trustAuthInOutBlob password_blob;
1024 struct samba_kdc_entry *p;
1025 bool use_previous;
1026 uint32_t current_kvno;
1027 uint32_t num_keys = 0;
1028 enum ndr_err_code ndr_err;
1029 int ret, trust_direction_flags;
1030 unsigned int i;
1031 struct AuthenticationInformationArray *auth_array;
1032 uint32_t supported_enctypes = ENC_RC4_HMAC_MD5;
1033
1034 if (dsdb_functional_level(kdc_db_ctx->samdb) >= DS_DOMAIN_FUNCTION_2008) {
1035 supported_enctypes = ldb_msg_find_attr_as_uint(msg,
1036 "msDS-SupportedEncryptionTypes",
1037 supported_enctypes);
1038 }
1039
1040 trust_direction_flags = ldb_msg_find_attr_as_int(msg, "trustDirection", 0);
1041
1042 if (direction == INBOUND) {
1043 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
1044
1045 } else { /* OUTBOUND */
1046 dnsdomain = ldb_msg_find_attr_as_string(msg, "trustPartner", NULL);
1047 /* replace realm */
1048 realm = strupper_talloc(mem_ctx, dnsdomain);
1049 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
1050 }
1051
1052 if (!password_val || !(trust_direction_flags & direction)) {
1053 krb5_clear_error_message(context);
1054 ret = HDB_ERR_NOENTRY;
1055 goto out;
1056 }
1057
1058 ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, &password_blob,
1059 (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
1060 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1061 krb5_clear_error_message(context);
1062 ret = EINVAL;
1063 goto out;
1064 }
1065
1066 p = talloc(mem_ctx, struct samba_kdc_entry);
1067 if (!p) {
1068 ret = ENOMEM;
1069 goto out;
1070 }
1071
1072 p->kdc_db_ctx = kdc_db_ctx;
1073 p->entry_ex = entry_ex;
1074 p->realm_dn = realm_dn;
1075
1076 talloc_set_destructor(p, samba_kdc_entry_destructor);
1077
1078 /* make sure we do not have bogus data in there */
1079 memset(&entry_ex->entry, 0, sizeof(hdb_entry));
1080
1081 entry_ex->ctx = p;
1082 entry_ex->free_entry = samba_kdc_free_entry;
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 ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
1096 if (ret) {
1097 krb5_clear_error_message(context);
1098 goto out;
1099 }
1100
1101 /*
1102 * While we have copied the client principal, tests
1103 * show that Win2k3 returns the 'corrected' realm, not
1104 * the client-specified realm. This code attempts to
1105 * replace the client principal's realm with the one
1106 * we determine from our records
1107 */
1108
1109 ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, realm);
1110 if (ret) {
1111 krb5_clear_error_message(context);
1112 goto out;
1113 }
1114
1115 entry_ex->entry.valid_start = NULL;
1116
1117 /* we need to work out if we are going to use the current or
1118 * the previous password hash.
1119 * We base this on the kvno the client passes in. If the kvno
1120 * passed in is equal to the current kvno in our database then
1121 * we use the current structure. If it is the current kvno-1,
1122 * then we use the previous substrucure.
1123 */
1124
1125 /* first work out the current kvno */
1126 current_kvno = 0;
1127 for (i=0; i < password_blob.count; i++) {
1128 if (password_blob.current.array[i].AuthType == TRUST_AUTH_TYPE_VERSION) {
1129 current_kvno = password_blob.current.array[i].AuthInfo.version.version;
1130 }
1131 }
1132
1133 /* work out whether we will use the previous or current
1134 password */
1135 if (password_blob.previous.count == 0) {
1136 /* there is no previous password */
1137 use_previous = false;
1138 } else if (!(flags & HDB_F_KVNO_SPECIFIED) ||
1139 kvno == current_kvno) {
1140 use_previous = false;
1141 } else if ((kvno+1 == current_kvno) ||
1142 (kvno == 255 && current_kvno == 0)) {
1143 use_previous = true;
1144 } else {
1145 DEBUG(1,(__location__ ": Request for unknown kvno %u - current kvno is %u\n",
1146 kvno, current_kvno));
1147 krb5_clear_error_message(context);
1148 ret = HDB_ERR_NOENTRY;
1149 goto out;
1150 }
1151
1152 if (use_previous) {
1153 auth_array = &password_blob.previous;
1154 } else {
1155 auth_array = &password_blob.current;
1156 }
1157
1158 /* use the kvno the client specified, if available */
1159 if (flags & HDB_F_KVNO_SPECIFIED) {
1160 entry_ex->entry.kvno = kvno;
1161 } else {
1162 entry_ex->entry.kvno = current_kvno;
1163 }
1164
1165 for (i=0; i < auth_array->count; i++) {
1166 if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
1167 bool ok;
1168
1169 password_utf16 = data_blob_const(auth_array->array[i].AuthInfo.clear.password,
1170 auth_array->array[i].AuthInfo.clear.size);
1171 if (password_utf16.length == 0) {
1172 break;
1173 }
1174
1175 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1176 mdfour(_password_hash.hash, password_utf16.data, password_utf16.length);
1177 if (password_hash == NULL) {
1178 num_keys += 1;
1179 }
1180 password_hash = &_password_hash;
1181 }
1182
1183 if (!(supported_enctypes & (ENC_HMAC_SHA1_96_AES128|ENC_HMAC_SHA1_96_AES256))) {
1184 break;
1185 }
1186
1187 ok = convert_string_talloc(mem_ctx,
1188 CH_UTF16MUNGED, CH_UTF8,
1189 password_utf16.data,
1190 password_utf16.length,
1191 (void *)&password_utf8.data,
1192 &password_utf8.length);
1193 if (!ok) {
1194 krb5_clear_error_message(context);
1195 ret = ENOMEM;
1196 goto out;
1197 }
1198
1199 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1200 num_keys += 1;
1201 }
1202 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1203 num_keys += 1;
1204 }
1205 break;
1206 } else if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
1207 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1208 password_hash = &auth_array->array[i].AuthInfo.nt4owf.password;
1209 num_keys += 1;
1210 }
1211 }
1212 }
1213
1214 /* Must have found a cleartext or MD4 password */
1215 if (num_keys == 0) {
1216 DEBUG(1,(__location__ ": no usable key found\n"));
1217 krb5_clear_error_message(context);
1218 ret = HDB_ERR_NOENTRY;
1219 goto out;
1220 }
1221
1222 entry_ex->entry.keys.val = calloc(num_keys, sizeof(Key));
1223 if (entry_ex->entry.keys.val == NULL) {
1224 krb5_clear_error_message(context);
1225 ret = ENOMEM;
1226 goto out;
1227 }
1228
1229 if (password_utf8.length != 0) {
1230 Key key = {};
1231 krb5_const_principal salt_principal = entry_ex->entry.principal;
1232 krb5_data salt;
1233 krb5_data cleartext_data;
1234
1235 cleartext_data.data = password_utf8.data;
1236 cleartext_data.length = password_utf8.length;
1237
1238 ret = smb_krb5_get_pw_salt(context,
1239 salt_principal,
1240 &salt);
1241 if (ret != 0) {
1242 goto out;
1243 }
1244
1245 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1246 ret = smb_krb5_create_key_from_string(context,
1247 salt_principal,
1248 &salt,
1249 &cleartext_data,
1250 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
1251 &key.key);
1252 if (ret != 0) {
1253 kerberos_free_data_contents(context, &salt);
1254 goto out;
1255 }
1256
1257 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1258 entry_ex->entry.keys.len++;
1259 }
1260
1261 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1262 ret = smb_krb5_create_key_from_string(context,
1263 salt_principal,
1264 &salt,
1265 &cleartext_data,
1266 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
1267 &key.key);
1268 if (ret != 0) {
1269 kerberos_free_data_contents(context, &salt);
1270 goto out;
1271 }
1272
1273 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1274 entry_ex->entry.keys.len++;
1275 }
1276
1277 kerberos_free_data_contents(context, &salt);
1278 }
1279
1280 if (password_hash != NULL) {
1281 Key key = {};
1282
1283 ret = smb_krb5_keyblock_init_contents(context,
1284 ENCTYPE_ARCFOUR_HMAC,
1285 password_hash->hash,
1286 sizeof(password_hash->hash),
1287 &key.key);
1288 if (ret != 0) {
1289 goto out;
1290 }
1291
1292 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1293 entry_ex->entry.keys.len++;
1294 }
1295
1296 entry_ex->entry.flags = int2HDBFlags(0);
1297 entry_ex->entry.flags.immutable = 1;
1298 entry_ex->entry.flags.invalid = 0;
1299 entry_ex->entry.flags.server = 1;
1300 entry_ex->entry.flags.require_preauth = 1;
1301
1302 entry_ex->entry.pw_end = NULL;
1303
1304 entry_ex->entry.max_life = NULL;
1305
1306 entry_ex->entry.max_renew = NULL;
1307
1308 entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
1309 if (entry_ex->entry.etypes == NULL) {
1310 krb5_clear_error_message(context);
1311 ret = ENOMEM;
1312 goto out;
1313 }
1314 entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
1315 entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
1316 if (entry_ex->entry.etypes->val == NULL) {
1317 krb5_clear_error_message(context);
1318 ret = ENOMEM;
1319 goto out;
1320 }
1321 for (i=0; i < entry_ex->entry.etypes->len; i++) {
1322 entry_ex->entry.etypes->val[i] = KRB5_KEY_TYPE(&entry_ex->entry.keys.val[i].key);
1323 }
1324
1325
1326 p->msg = talloc_steal(p, msg);
1327
1328 out:
1329 if (ret != 0) {
1330 /* This doesn't free ent itself, that is for the eventual caller to do */
1331 hdb_free_entry(context, entry_ex);
1332 } else {
1333 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1334 }
1335
1336 return ret;
1337
1338 }
1339
1340 static krb5_error_code samba_kdc_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
1341 TALLOC_CTX *mem_ctx,
1342 const char *realm,
1343 struct ldb_dn *realm_dn,
1344 struct ldb_message **pmsg)
1345 {
1346 NTSTATUS status;
1347 const char * const *attrs = trust_attrs;
1348
1349 status = sam_get_results_trust(ldb_ctx,
1350 mem_ctx, realm, realm, attrs,
1351 pmsg);
1352 if (NT_STATUS_IS_OK(status)) {
1353 return 0;
1354 } else if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
1355 return HDB_ERR_NOENTRY;
1356 } else if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1357 int ret = ENOMEM;
1358 krb5_set_error_message(context, ret, "get_sam_result_trust: out of memory");
1359 return ret;
1360 } else {
1361 int ret = EINVAL;
1362 krb5_set_error_message(context, ret, "get_sam_result_trust: %s", nt_errstr(status));
1363 return ret;
1364 }
1365 }
1366
1367 static krb5_error_code samba_kdc_lookup_client(krb5_context context,
1368 struct samba_kdc_db_context *kdc_db_ctx,
1369 TALLOC_CTX *mem_ctx,
1370 krb5_const_principal principal,
1371 const char **attrs,
1372 struct ldb_dn **realm_dn,
1373 struct ldb_message **msg)
1374 {
1375 NTSTATUS nt_status;
1376 char *principal_string = NULL;
1377
1378 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1379 principal_string = smb_krb5_principal_get_comp_string(mem_ctx, context,
1380 principal, 0);
1381 if (principal_string == NULL) {
1382 return ENOMEM;
1383 }
1384 } else {
1385 char *principal_string_m = NULL;
1386 krb5_error_code ret;
1387
1388 ret = krb5_unparse_name(context, principal, &principal_string_m);
1389 if (ret != 0) {
1390 return ret;
1391 }
1392
1393 principal_string = talloc_strdup(mem_ctx, principal_string_m);
1394 SAFE_FREE(principal_string_m);
1395 if (principal_string == NULL) {
1396 return ENOMEM;
1397 }
1398 }
1399
1400 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1401 mem_ctx, principal_string, attrs,
1402 realm_dn, msg);
1403 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1404 krb5_principal fallback_principal = NULL;
1405 unsigned int num_comp;
1406 char *fallback_realm = NULL;
1407 char *fallback_account = NULL;
1408 krb5_error_code ret;
1409
1410 ret = krb5_parse_name(context, principal_string,
1411 &fallback_principal);
1412 TALLOC_FREE(principal_string);
1413 if (ret != 0) {
1414 return ret;
1415 }
1416
1417 num_comp = krb5_princ_size(context, fallback_principal);
1418 fallback_realm = smb_krb5_principal_get_realm(context,
1419 fallback_principal);
1420 if (fallback_realm == NULL) {
1421 krb5_free_principal(context, fallback_principal);
1422 return ENOMEM;
1423 }
1424
1425 if (num_comp == 1) {
1426 size_t len;
1427
1428 fallback_account = smb_krb5_principal_get_comp_string(mem_ctx,
1429 context, fallback_principal, 0);
1430 if (fallback_account == NULL) {
1431 krb5_free_principal(context, fallback_principal);
1432 SAFE_FREE(fallback_realm);
1433 return ENOMEM;
1434 }
1435
1436 len = strlen(fallback_account);
1437 if (len >= 2 && fallback_account[len - 1] == '$') {
1438 TALLOC_FREE(fallback_account);
1439 }
1440 }
1441 krb5_free_principal(context, fallback_principal);
1442 fallback_principal = NULL;
1443
1444 if (fallback_account != NULL) {
1445 char *with_dollar;
1446
1447 with_dollar = talloc_asprintf(mem_ctx, "%s$",
1448 fallback_account);
1449 if (with_dollar == NULL) {
1450 SAFE_FREE(fallback_realm);
1451 return ENOMEM;
1452 }
1453 TALLOC_FREE(fallback_account);
1454
1455 ret = smb_krb5_make_principal(context,
1456 &fallback_principal,
1457 fallback_realm,
1458 with_dollar, NULL);
1459 TALLOC_FREE(with_dollar);
1460 if (ret != 0) {
1461 SAFE_FREE(fallback_realm);
1462 return ret;
1463 }
1464 }
1465 SAFE_FREE(fallback_realm);
1466
1467 if (fallback_principal != NULL) {
1468 char *fallback_string = NULL;
1469
1470 ret = krb5_unparse_name(context,
1471 fallback_principal,
1472 &fallback_string);
1473 if (ret != 0) {
1474 krb5_free_principal(context, fallback_principal);
1475 return ret;
1476 }
1477
1478 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1479 mem_ctx,
1480 fallback_string,
1481 attrs,
1482 realm_dn, msg);
1483 SAFE_FREE(fallback_string);
1484 }
1485 krb5_free_principal(context, fallback_principal);
1486 fallback_principal = NULL;
1487 }
1488 TALLOC_FREE(principal_string);
1489
1490 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1491 return HDB_ERR_NOENTRY;
1492 } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1493 return ENOMEM;
1494 } else if (!NT_STATUS_IS_OK(nt_status)) {
1495 return EINVAL;
1496 }
1497
1498 return 0;
1499 }
1500
1501 static krb5_error_code samba_kdc_fetch_client(krb5_context context,
1502 struct samba_kdc_db_context *kdc_db_ctx,
1503 TALLOC_CTX *mem_ctx,
1504 krb5_const_principal principal,
1505 unsigned flags,
1506 hdb_entry_ex *entry_ex) {
1507 struct ldb_dn *realm_dn;
1508 krb5_error_code ret;
1509 struct ldb_message *msg = NULL;
1510
1511 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1512 mem_ctx, principal, user_attrs,
1513 &realm_dn, &msg);
1514 if (ret != 0) {
1515 return ret;
1516 }
1517
1518 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1519 principal, SAMBA_KDC_ENT_TYPE_CLIENT,
1520 flags,
1521 realm_dn, msg, entry_ex);
1522 return ret;
1523 }
1524
1525 static krb5_error_code samba_kdc_fetch_krbtgt(krb5_context context,
1526 struct samba_kdc_db_context *kdc_db_ctx,
1527 TALLOC_CTX *mem_ctx,
1528 krb5_const_principal principal,
1529 unsigned flags,
1530 uint32_t kvno,
1531 hdb_entry_ex *entry_ex)
1532 {
1533 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1534 krb5_error_code ret;
1535 struct ldb_message *msg = NULL;
1536 struct ldb_dn *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1537 char *realm_from_princ, *realm_from_princ_malloc;
1538 char *realm_princ_comp = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 1);
1539
1540 realm_from_princ_malloc = smb_krb5_principal_get_realm(context, principal);
1541 if (realm_from_princ_malloc == NULL) {
1542 /* can't happen */
1543 return HDB_ERR_NOENTRY;
1544 }
1545 realm_from_princ = talloc_strdup(mem_ctx, realm_from_princ_malloc);
1546 free(realm_from_princ_malloc);
1547 if (realm_from_princ == NULL) {
1548 return HDB_ERR_NOENTRY;
1549 }
1550
1551 if (krb5_princ_size(context, principal) != 2
1552 || (principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME) != 0)) {
1553 /* Not a krbtgt */
1554 return HDB_ERR_NOENTRY;
1555 }
1556
1557 /* krbtgt case. Either us or a trusted realm */
1558
1559 if (lpcfg_is_my_domain_or_realm(lp_ctx, realm_from_princ)
1560 && lpcfg_is_my_domain_or_realm(lp_ctx, realm_princ_comp)) {
1561 /* us, or someone quite like us */
1562 /* Cludge, cludge cludge. If the realm part of krbtgt/realm,
1563 * is in our db, then direct the caller at our primary
1564 * krbtgt */
1565
1566 int lret;
1567 unsigned int krbtgt_number;
1568 /* w2k8r2 sometimes gives us a kvno of 255 for inter-domain
1569 trust tickets. We don't yet know what this means, but we do
1570 seem to need to treat it as unspecified */
1571 if (flags & HDB_F_KVNO_SPECIFIED) {
1572 krbtgt_number = SAMBA_KVNO_GET_KRBTGT(kvno);
1573 if (kdc_db_ctx->rodc) {
1574 if (krbtgt_number != kdc_db_ctx->my_krbtgt_number) {
1575 return HDB_ERR_NOT_FOUND_HERE;
1576 }
1577 }
1578 } else {
1579 krbtgt_number = kdc_db_ctx->my_krbtgt_number;
1580 }
1581
1582 if (krbtgt_number == kdc_db_ctx->my_krbtgt_number) {
1583 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1584 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
1585 krbtgt_attrs, DSDB_SEARCH_NO_GLOBAL_CATALOG,
1586 "(objectClass=user)");
1587 } else {
1588 /* We need to look up an RODC krbtgt (perhaps
1589 * ours, if we are an RODC, perhaps another
1590 * RODC if we are a read-write DC */
1591 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1592 &msg, realm_dn, LDB_SCOPE_SUBTREE,
1593 krbtgt_attrs,
1594 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1595 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=%u))", (unsigned)(krbtgt_number));
1596 }
1597
1598 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1599 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1600 (unsigned)(krbtgt_number));
1601 krb5_set_error_message(context, HDB_ERR_NOENTRY,
1602 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1603 (unsigned)(krbtgt_number));
1604 return HDB_ERR_NOENTRY;
1605 } else if (lret != LDB_SUCCESS) {
1606 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1607 (unsigned)(krbtgt_number));
1608 krb5_set_error_message(context, HDB_ERR_NOENTRY,
1609 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1610 (unsigned)(krbtgt_number));
1611 return HDB_ERR_NOENTRY;
1612 }
1613
1614 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1615 principal, SAMBA_KDC_ENT_TYPE_KRBTGT,
1616 flags, realm_dn, msg, entry_ex);
1617 if (ret != 0) {
1618 krb5_warnx(context, "samba_kdc_fetch: self krbtgt message2entry failed");
1619 }
1620 return ret;
1621
1622 } else {
1623 enum trust_direction direction = UNKNOWN;
1624 const char *realm = NULL;
1625
1626 /* Either an inbound or outbound trust */
1627
1628 if (strcasecmp(lpcfg_realm(lp_ctx), realm_from_princ) == 0) {
1629 /* look for inbound trust */
1630 direction = INBOUND;
1631 realm = realm_princ_comp;
1632 } else if (principal_comp_strcasecmp(context, principal, 1, lpcfg_realm(lp_ctx)) == 0) {
1633 /* look for outbound trust */
1634 direction = OUTBOUND;
1635 realm = realm_from_princ;
1636 } else {
1637 krb5_warnx(context, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1638 realm_from_princ,
1639 realm_princ_comp);
1640 krb5_set_error_message(context, HDB_ERR_NOENTRY, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1641 realm_from_princ,
1642 realm_princ_comp);
1643 return HDB_ERR_NOENTRY;
1644 }
1645
1646 /* Trusted domains are under CN=system */
1647
1648 ret = samba_kdc_lookup_trust(context, kdc_db_ctx->samdb,
1649 mem_ctx,
1650 realm, realm_dn, &msg);
1651
1652 if (ret != 0) {
1653 krb5_warnx(context, "samba_kdc_fetch: could not find principal in DB");
1654 krb5_set_error_message(context, ret, "samba_kdc_fetch: could not find principal in DB");
1655 return ret;
1656 }
1657
1658 ret = samba_kdc_trust_message2entry(context, kdc_db_ctx, mem_ctx,
1659 principal, direction,
1660 realm_dn, flags, kvno, msg, entry_ex);
1661 if (ret != 0) {
1662 krb5_warnx(context, "samba_kdc_fetch: trust_message2entry failed for %s",
1663 ldb_dn_get_linearized(msg->dn));
1664 krb5_set_error_message(context, ret, "samba_kdc_fetch: "
1665 "trust_message2entry failed for %s",
1666 ldb_dn_get_linearized(msg->dn));
1667 }
1668 return ret;
1669 }
1670
1671 }
1672
1673 static krb5_error_code samba_kdc_lookup_server(krb5_context context,
1674 struct samba_kdc_db_context *kdc_db_ctx,
1675 TALLOC_CTX *mem_ctx,
1676 krb5_const_principal principal,
1677 unsigned flags,
1678 const char **attrs,
1679 struct ldb_dn **realm_dn,
1680 struct ldb_message **msg)
1681 {
1682 krb5_error_code ret;
1683 if ((smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL)
1684 && krb5_princ_size(context, principal) >= 2) {
1685 /* 'normal server' case */
1686 int ldb_ret;
1687 NTSTATUS nt_status;
1688 struct ldb_dn *user_dn;
1689 char *principal_string;
1690
1691 ret = krb5_unparse_name_flags(context, principal,
1692 KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1693 &principal_string);
1694 if (ret != 0) {
1695 return ret;
1696 }
1697
1698 /* At this point we may find the host is known to be
1699 * in a different realm, so we should generate a
1700 * referral instead */
1701 nt_status = crack_service_principal_name(kdc_db_ctx->samdb,
1702 mem_ctx, principal_string,
1703 &user_dn, realm_dn);
1704 free(principal_string);
1705
1706 if (!NT_STATUS_IS_OK(nt_status)) {
1707 return HDB_ERR_NOENTRY;
1708 }
1709
1710 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb,
1711 mem_ctx,
1712 msg, user_dn, LDB_SCOPE_BASE,
1713 attrs,
1714 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1715 "(objectClass=*)");
1716 if (ldb_ret != LDB_SUCCESS) {
1717 return HDB_ERR_NOENTRY;
1718 }
1719 return 0;
1720 } else if (!(flags & HDB_F_FOR_AS_REQ)
1721 && smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1722 /*
1723 * The behaviour of accepting an
1724 * KRB5_NT_ENTERPRISE_PRINCIPAL server principal
1725 * containing a UPN only applies to TGS-REQ packets,
1726 * not AS-REQ packets.
1727 */
1728 return samba_kdc_lookup_client(context, kdc_db_ctx,
1729 mem_ctx, principal, attrs,
1730 realm_dn, msg);
1731 } else {
1732 /*
1733 * This case is for:
1734 * - the AS-REQ, where we only accept
1735 * samAccountName based lookups for the server, no
1736 * matter if the name is an
1737 * KRB5_NT_ENTERPRISE_PRINCIPAL or not
1738 * - for the TGS-REQ when we are not given an
1739 * KRB5_NT_ENTERPRISE_PRINCIPAL, which also must
1740 * only lookup samAccountName based names.
1741 */
1742 int lret;
1743 char *short_princ;
1744 krb5_principal enterprise_principal = NULL;
1745 krb5_const_principal used_principal = NULL;
1746 char *name1 = NULL;
1747 size_t len1 = 0;
1748 char *filter = NULL;
1749
1750 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1751 char *str = NULL;
1752 /* Need to reparse the enterprise principal to find the real target */
1753 if (krb5_princ_size(context, principal) != 1) {
1754 ret = KRB5_PARSE_MALFORMED;
1755 krb5_set_error_message(context, ret, "samba_kdc_lookup_server: request for an "
1756 "enterprise principal with wrong (%d) number of components",
1757 krb5_princ_size(context, principal));
1758 return ret;
1759 }
1760 str = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 0);
1761 if (str == NULL) {
1762 return KRB5_PARSE_MALFORMED;
1763 }
1764 ret = krb5_parse_name(context, str,
1765 &enterprise_principal);
1766 talloc_free(str);
1767 if (ret) {
1768 return ret;
1769 }
1770 used_principal = enterprise_principal;
1771 } else {
1772 used_principal = principal;
1773 }
1774
1775 /* server as client principal case, but we must not lookup userPrincipalNames */
1776 *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1777
1778 /* TODO: Check if it is our realm, otherwise give referral */
1779
1780 ret = krb5_unparse_name_flags(context, used_principal,
1781 KRB5_PRINCIPAL_UNPARSE_NO_REALM |
1782 KRB5_PRINCIPAL_UNPARSE_DISPLAY,
1783 &short_princ);
1784 used_principal = NULL;
1785 krb5_free_principal(context, enterprise_principal);
1786 enterprise_principal = NULL;
1787
1788 if (ret != 0) {
1789 krb5_set_error_message(context, ret, "samba_kdc_lookup_principal: could not parse principal");
1790 krb5_warnx(context, "samba_kdc_lookup_principal: could not parse principal");
1791 return ret;
1792 }
1793
1794 name1 = ldb_binary_encode_string(mem_ctx, short_princ);
1795 SAFE_FREE(short_princ);
1796 if (name1 == NULL) {
1797 return ENOMEM;
1798 }
1799 len1 = strlen(name1);
1800 if (len1 >= 1 && name1[len1 - 1] != '$') {
1801 filter = talloc_asprintf(mem_ctx,
1802 "(&(objectClass=user)(|(samAccountName=%s)(samAccountName=%s$)))",
1803 name1, name1);
1804 if (filter == NULL) {
1805 return ENOMEM;
1806 }
1807 } else {
1808 filter = talloc_asprintf(mem_ctx,
1809 "(&(objectClass=user)(samAccountName=%s))",
1810 name1);
1811 if (filter == NULL) {
1812 return ENOMEM;
1813 }
1814 }
1815
1816 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx, msg,
1817 *realm_dn, LDB_SCOPE_SUBTREE,
1818 attrs,
1819 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1820 "%s", filter);
1821 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1822 DEBUG(10, ("Failed to find an entry for %s filter:%s\n",
1823 name1, filter));
1824 return HDB_ERR_NOENTRY;
1825 }
1826 if (lret == LDB_ERR_CONSTRAINT_VIOLATION) {
1827 DEBUG(10, ("Failed to find unique entry for %s filter:%s\n",
1828 name1, filter));
1829 return HDB_ERR_NOENTRY;
1830 }
1831 if (lret != LDB_SUCCESS) {
1832 DEBUG(0, ("Failed single search for %s - %s\n",
1833 name1, ldb_errstring(kdc_db_ctx->samdb)));
1834 return HDB_ERR_NOENTRY;
1835 }
1836 return 0;
1837 }
1838 return HDB_ERR_NOENTRY;
1839 }
1840
1841
1842
1843 static krb5_error_code samba_kdc_fetch_server(krb5_context context,
1844 struct samba_kdc_db_context *kdc_db_ctx,
1845 TALLOC_CTX *mem_ctx,
1846 krb5_const_principal principal,
1847 unsigned flags,
1848 hdb_entry_ex *entry_ex)
1849 {
1850 krb5_error_code ret;
1851 struct ldb_dn *realm_dn;
1852 struct ldb_message *msg;
1853
1854 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, principal,
1855 flags, server_attrs, &realm_dn, &msg);
1856 if (ret != 0) {
1857 return ret;
1858 }
1859
1860 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1861 principal, SAMBA_KDC_ENT_TYPE_SERVER,
1862 flags,
1863 realm_dn, msg, entry_ex);
1864 if (ret != 0) {
1865 krb5_warnx(context, "samba_kdc_fetch: message2entry failed");
1866 }
1867
1868 return ret;
1869 }
1870
1871 krb5_error_code samba_kdc_fetch(krb5_context context,
1872 struct samba_kdc_db_context *kdc_db_ctx,
1873 krb5_const_principal principal,
1874 unsigned flags,
1875 krb5_kvno kvno,
1876 hdb_entry_ex *entry_ex)
1877 {
1878 krb5_error_code ret = HDB_ERR_NOENTRY;
1879 TALLOC_CTX *mem_ctx;
1880
1881 mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_fetch context");
1882 if (!mem_ctx) {
1883 ret = ENOMEM;
1884 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
1885 return ret;
1886 }
1887
1888 if (flags & HDB_F_GET_CLIENT) {
1889 ret = samba_kdc_fetch_client(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
1890 if (ret != HDB_ERR_NOENTRY) goto done;
1891 }
1892 if (flags & HDB_F_GET_SERVER) {
1893 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
1894 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
1895 if (ret != HDB_ERR_NOENTRY) goto done;
1896
1897 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
1898 ret = samba_kdc_fetch_server(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
1899 if (ret != HDB_ERR_NOENTRY) goto done;
1900 }
1901 if (flags & HDB_F_GET_KRBTGT) {
1902 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
1903 if (ret != HDB_ERR_NOENTRY) goto done;
1904 }
1905
1906 done:
1907 talloc_free(mem_ctx);
1908 return ret;
1909 }
1910
1911 struct samba_kdc_seq {
1912 unsigned int index;
1913 unsigned int count;
1914 struct ldb_message **msgs;
1915 struct ldb_dn *realm_dn;
1916 };
1917
1918 static krb5_error_code samba_kdc_seq(krb5_context context,
1919 struct samba_kdc_db_context *kdc_db_ctx,
1920 hdb_entry_ex *entry)
1921 {
1922 krb5_error_code ret;
1923 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
1924 const char *realm = lpcfg_realm(kdc_db_ctx->lp_ctx);
1925 struct ldb_message *msg = NULL;
1926 const char *sAMAccountName = NULL;
1927 krb5_principal principal = NULL;
1928 TALLOC_CTX *mem_ctx;
1929
1930 if (!priv) {
1931 return HDB_ERR_NOENTRY;
1932 }
1933
1934 mem_ctx = talloc_named(priv, 0, "samba_kdc_seq context");
1935
1936 if (!mem_ctx) {
1937 ret = ENOMEM;
1938 krb5_set_error_message(context, ret, "samba_kdc_seq: talloc_named() failed!");
1939 return ret;
1940 }
1941
1942 while (priv->index < priv->count) {
1943 msg = priv->msgs[priv->index++];
1944
1945 sAMAccountName = ldb_msg_find_attr_as_string(msg, "sAMAccountName", NULL);
1946 if (sAMAccountName != NULL) {
1947 break;
1948 }
1949 }
1950
1951 if (sAMAccountName == NULL) {
1952 ret = HDB_ERR_NOENTRY;
1953 goto out;
1954 }
1955
1956 ret = smb_krb5_make_principal(context, &principal,
1957 realm, sAMAccountName, NULL);
1958 if (ret != 0) {
1959 goto out;
1960 }
1961
1962 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1963 principal, SAMBA_KDC_ENT_TYPE_ANY,
1964 HDB_F_ADMIN_DATA|HDB_F_GET_ANY,
1965 priv->realm_dn, msg, entry);
1966
1967 out:
1968 if (principal != NULL) {
1969 krb5_free_principal(context, principal);
1970 }
1971
1972 if (ret != 0) {
1973 TALLOC_FREE(priv);
1974 kdc_db_ctx->seq_ctx = NULL;
1975 } else {
1976 talloc_free(mem_ctx);
1977 }
1978
1979 return ret;
1980 }
1981
1982 krb5_error_code samba_kdc_firstkey(krb5_context context,
1983 struct samba_kdc_db_context *kdc_db_ctx,
1984 hdb_entry_ex *entry)
1985 {
1986 struct ldb_context *ldb_ctx = kdc_db_ctx->samdb;
1987 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
1988 char *realm;
1989 struct ldb_result *res = NULL;
1990 krb5_error_code ret;
1991 TALLOC_CTX *mem_ctx;
1992 int lret;
1993
1994 if (priv) {
1995 TALLOC_FREE(priv);
1996 kdc_db_ctx->seq_ctx = NULL;
1997 }
1998
1999 priv = (struct samba_kdc_seq *) talloc(kdc_db_ctx, struct samba_kdc_seq);
2000 if (!priv) {
2001 ret = ENOMEM;
2002 krb5_set_error_message(context, ret, "talloc: out of memory");
2003 return ret;
2004 }
2005
2006 priv->index = 0;
2007 priv->msgs = NULL;
2008 priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
2009 priv->count = 0;
2010
2011 mem_ctx = talloc_named(priv, 0, "samba_kdc_firstkey context");
2012
2013 if (!mem_ctx) {
2014 ret = ENOMEM;
2015 krb5_set_error_message(context, ret, "samba_kdc_firstkey: talloc_named() failed!");
2016 return ret;
2017 }
2018
2019 ret = krb5_get_default_realm(context, &realm);
2020 if (ret != 0) {
2021 TALLOC_FREE(priv);
2022 return ret;
2023 }
2024 krb5_free_default_realm(context, realm);
2025
2026 lret = dsdb_search(ldb_ctx, priv, &res,
2027 priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
2028 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2029 "(objectClass=user)");
2030
2031 if (lret != LDB_SUCCESS) {
2032 TALLOC_FREE(priv);
2033 return HDB_ERR_NOENTRY;
2034 }
2035
2036 priv->count = res->count;
2037 priv->msgs = talloc_steal(priv, res->msgs);
2038 talloc_free(res);
2039
2040 kdc_db_ctx->seq_ctx = priv;
2041
2042 ret = samba_kdc_seq(context, kdc_db_ctx, entry);
2043
2044 if (ret != 0) {
2045 TALLOC_FREE(priv);
2046 kdc_db_ctx->seq_ctx = NULL;
2047 } else {
2048 talloc_free(mem_ctx);
2049 }
2050 return ret;
2051 }
2052
2053 krb5_error_code samba_kdc_nextkey(krb5_context context,
2054 struct samba_kdc_db_context *kdc_db_ctx,
2055 hdb_entry_ex *entry)
2056 {
2057 return samba_kdc_seq(context, kdc_db_ctx, entry);
2058 }
2059
2060 /* Check if a given entry may delegate or do s4u2self to this target principal
2061 *
2062 * This is currently a very nasty hack - allowing only delegation to itself.
2063 */
2064 krb5_error_code
2065 samba_kdc_check_s4u2self(krb5_context context,
2066 struct samba_kdc_db_context *kdc_db_ctx,
2067 struct samba_kdc_entry *skdc_entry,
2068 krb5_const_principal target_principal)
2069 {
2070 krb5_error_code ret;
2071 struct ldb_dn *realm_dn;
2072 struct ldb_message *msg;
2073 struct dom_sid *orig_sid;
2074 struct dom_sid *target_sid;
2075 const char *delegation_check_attrs[] = {
2076 "objectSid", NULL
2077 };
2078
2079 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2self");
2080
2081 if (!mem_ctx) {
2082 ret = ENOMEM;
2083 krb5_set_error_message(context, ret, "samba_kdc_check_s4u2self: talloc_named() failed!");
2084 return ret;
2085 }
2086
2087 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, target_principal,
2088 HDB_F_GET_CLIENT|HDB_F_GET_SERVER,
2089 delegation_check_attrs, &realm_dn, &msg);
2090
2091 if (ret != 0) {
2092 talloc_free(mem_ctx);
2093 return ret;
2094 }
2095
2096 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2097 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2098
2099 /* Allow delegation to the same principal, even if by a different
2100 * name. The easy and safe way to prove this is by SID
2101 * comparison */
2102 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2103 talloc_free(mem_ctx);
2104 return KRB5KDC_ERR_BADOPTION;
2105 }
2106
2107 talloc_free(mem_ctx);
2108 return ret;
2109 }
2110
2111 /* Certificates printed by a the Certificate Authority might have a
2112 * slightly different form of the user principal name to that in the
2113 * database. Allow a mismatch where they both refer to the same
2114 * SID */
2115
2116 krb5_error_code
2117 samba_kdc_check_pkinit_ms_upn_match(krb5_context context,
2118 struct samba_kdc_db_context *kdc_db_ctx,
2119 struct samba_kdc_entry *skdc_entry,
2120 krb5_const_principal certificate_principal)
2121 {
2122 krb5_error_code ret;
2123 struct ldb_dn *realm_dn;
2124 struct ldb_message *msg;
2125 struct dom_sid *orig_sid;
2126 struct dom_sid *target_sid;
2127 const char *ms_upn_check_attrs[] = {
2128 "objectSid", NULL
2129 };
2130
2131 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_pkinit_ms_upn_match");
2132
2133 if (!mem_ctx) {
2134 ret = ENOMEM;
2135 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2136 return ret;
2137 }
2138
2139 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
2140 mem_ctx, certificate_principal,
2141 ms_upn_check_attrs, &realm_dn, &msg);
2142
2143 if (ret != 0) {
2144 talloc_free(mem_ctx);
2145 return ret;
2146 }
2147
2148 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2149 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2150
2151 /* Consider these to be the same principal, even if by a different
2152 * name. The easy and safe way to prove this is by SID
2153 * comparison */
2154 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2155 talloc_free(mem_ctx);
2156 #ifdef KRB5_KDC_ERR_CLIENT_NAME_MISMATCH /* Heimdal */
2157 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
2158 #elif defined(KRB5KDC_ERR_CLIENT_NAME_MISMATCH) /* MIT */
2159 return KRB5KDC_ERR_CLIENT_NAME_MISMATCH;
2160 #endif
2161 }
2162
2163 talloc_free(mem_ctx);
2164 return ret;
2165 }
2166
2167 /*
2168 * Check if a given entry may delegate to this target principal
2169 * with S4U2Proxy.
2170 */
2171 krb5_error_code
2172 samba_kdc_check_s4u2proxy(krb5_context context,
2173 struct samba_kdc_db_context *kdc_db_ctx,
2174 struct samba_kdc_entry *skdc_entry,
2175 krb5_const_principal target_principal)
2176 {
2177 krb5_error_code ret;
2178 char *tmp = NULL;
2179 const char *client_dn = NULL;
2180 const char *target_principal_name = NULL;
2181 struct ldb_message_element *el;
2182 struct ldb_val val;
2183 unsigned int i;
2184 bool found = false;
2185
2186 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2proxy");
2187
2188 if (!mem_ctx) {
2189 ret = ENOMEM;
2190 krb5_set_error_message(context, ret,
2191 "samba_kdc_check_s4u2proxy:"
2192 " talloc_named() failed!");
2193 return ret;
2194 }
2195
2196 client_dn = ldb_dn_get_linearized(skdc_entry->msg->dn);
2197 if (!client_dn) {
2198 if (errno == 0) {
2199 errno = ENOMEM;
2200 }
2201 ret = errno;
2202 krb5_set_error_message(context, ret,
2203 "samba_kdc_check_s4u2proxy:"
2204 " ldb_dn_get_linearized() failed!");
2205 return ret;
2206 }
2207
2208 /*
2209 * The main heimdal code already checked that the target_principal
2210 * belongs to the same realm as the client.
2211 *
2212 * So we just need the principal without the realm,
2213 * as that is what is configured in the "msDS-AllowedToDelegateTo"
2214 * attribute.
2215 */
2216 ret = krb5_unparse_name_flags(context, target_principal,
2217 KRB5_PRINCIPAL_UNPARSE_NO_REALM, &tmp);
2218 if (ret) {
2219 talloc_free(mem_ctx);
2220 krb5_set_error_message(context, ret,
2221 "samba_kdc_check_s4u2proxy:"
2222 " krb5_unparse_name() failed!");
2223 return ret;
2224 }
2225 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] for target[%s]\n",
2226 client_dn, tmp));
2227
2228 target_principal_name = talloc_strdup(mem_ctx, tmp);
2229 SAFE_FREE(tmp);
2230 if (target_principal_name == NULL) {
2231 ret = ENOMEM;
2232 krb5_set_error_message(context, ret,
2233 "samba_kdc_check_s4u2proxy:"
2234 " talloc_strdup() failed!");
2235 return ret;
2236 }
2237
2238 el = ldb_msg_find_element(skdc_entry->msg, "msDS-AllowedToDelegateTo");
2239 if (el == NULL) {
2240 goto bad_option;
2241 }
2242
2243 val = data_blob_string_const(target_principal_name);
2244
2245 for (i=0; i<el->num_values; i++) {
2246 struct ldb_val *val1 = &val;
2247 struct ldb_val *val2 = &el->values[i];
2248 int cmp;
2249
2250 if (val1->length != val2->length) {
2251 continue;
2252 }
2253
2254 cmp = strncasecmp((const char *)val1->data,
2255 (const char *)val2->data,
2256 val1->length);
2257 if (cmp != 0) {
2258 continue;
2259 }
2260
2261 found = true;
2262 break;
2263 }
2264
2265 if (!found) {
2266 goto bad_option;
2267 }
2268
2269 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] allowed target[%s]\n",
2270 client_dn, tmp));
2271 talloc_free(mem_ctx);
2272 return 0;
2273
2274 bad_option:
2275 krb5_set_error_message(context, ret,
2276 "samba_kdc_check_s4u2proxy: client[%s] "
2277 "not allowed for delegation to target[%s]",
2278 client_dn,
2279 target_principal_name);
2280 talloc_free(mem_ctx);
2281 return KRB5KDC_ERR_BADOPTION;
2282 }
2283
2284 NTSTATUS samba_kdc_setup_db_ctx(TALLOC_CTX *mem_ctx, struct samba_kdc_base_context *base_ctx,
2285 struct samba_kdc_db_context **kdc_db_ctx_out)
2286 {
2287 int ldb_ret;
2288 struct ldb_message *msg;
2289 struct auth_session_info *session_info;
2290 struct samba_kdc_db_context *kdc_db_ctx;
2291 /* The idea here is very simple. Using Kerberos to
2292 * authenticate the KDC to the LDAP server is higly likely to
2293 * be circular.
2294 *
2295 * In future we may set this up to use EXERNAL and SSL
2296 * certificates, for now it will almost certainly be NTLMSSP_SET_USERNAME
2297 */
2298
2299 kdc_db_ctx = talloc_zero(mem_ctx, struct samba_kdc_db_context);
2300 if (kdc_db_ctx == NULL) {
2301 return NT_STATUS_NO_MEMORY;
2302 }
2303 kdc_db_ctx->ev_ctx = base_ctx->ev_ctx;
2304 kdc_db_ctx->lp_ctx = base_ctx->lp_ctx;
2305
2306 /* get default kdc policy */
2307 lpcfg_default_kdc_policy(base_ctx->lp_ctx,
2308 &kdc_db_ctx->policy.svc_tkt_lifetime,
2309 &kdc_db_ctx->policy.usr_tkt_lifetime,
2310 &kdc_db_ctx->policy.renewal_lifetime);
2311
2312 session_info = system_session(kdc_db_ctx->lp_ctx);
2313 if (session_info == NULL) {
2314 return NT_STATUS_INTERNAL_ERROR;
2315 }
2316
2317 /* Setup the link to LDB */
2318 kdc_db_ctx->samdb = samdb_connect(kdc_db_ctx, base_ctx->ev_ctx,
2319 base_ctx->lp_ctx, session_info, 0);
2320 if (kdc_db_ctx->samdb == NULL) {
2321 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot open samdb for KDC backend!"));
2322 talloc_free(kdc_db_ctx);
2323 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2324 }
2325
2326 /* Find out our own krbtgt kvno */
2327 ldb_ret = samdb_rodc(kdc_db_ctx->samdb, &kdc_db_ctx->rodc);
2328 if (ldb_ret != LDB_SUCCESS) {
2329 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine if we are an RODC in KDC backend: %s\n",
2330 ldb_errstring(kdc_db_ctx->samdb)));
2331 talloc_free(kdc_db_ctx);
2332 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2333 }
2334 if (kdc_db_ctx->rodc) {
2335 int my_krbtgt_number;
2336 const char *secondary_keytab[] = { "msDS-SecondaryKrbTgtNumber", NULL };
2337 struct ldb_dn *account_dn;
2338 struct ldb_dn *server_dn = samdb_server_dn(kdc_db_ctx->samdb, kdc_db_ctx);
2339 if (!server_dn) {
2340 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server DN in KDC backend: %s\n",
2341 ldb_errstring(kdc_db_ctx->samdb)));
2342 talloc_free(kdc_db_ctx);
2343 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2344 }
2345
2346 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, server_dn,
2347 "serverReference", &account_dn);
2348 if (ldb_ret != LDB_SUCCESS) {
2349 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server account in KDC backend: %s\n",
2350 ldb_errstring(kdc_db_ctx->samdb)));
2351 talloc_free(kdc_db_ctx);
2352 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2353 }
2354
2355 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, account_dn,
2356 "msDS-KrbTgtLink", &kdc_db_ctx->krbtgt_dn);
2357 talloc_free(account_dn);
2358 if (ldb_ret != LDB_SUCCESS) {
2359 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine RODC krbtgt account in KDC backend: %s\n",
2360 ldb_errstring(kdc_db_ctx->samdb)));
2361 talloc_free(kdc_db_ctx);
2362 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2363 }
2364
2365 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2366 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
2367 secondary_keytab,
2368 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2369 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=*))");
2370 if (ldb_ret != LDB_SUCCESS) {
2371 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read krbtgt account %s in KDC backend to get msDS-SecondaryKrbTgtNumber: %s: %s\n",
2372 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2373 ldb_errstring(kdc_db_ctx->samdb),
2374 ldb_strerror(ldb_ret)));
2375 talloc_free(kdc_db_ctx);
2376 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2377 }
2378 my_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
2379 if (my_krbtgt_number == -1) {
2380 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read msDS-SecondaryKrbTgtNumber from krbtgt account %s in KDC backend: got %d\n",
2381 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2382 my_krbtgt_number));
2383 talloc_free(kdc_db_ctx);
2384 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2385 }
2386 kdc_db_ctx->my_krbtgt_number = my_krbtgt_number;
2387
2388 } else {
2389 kdc_db_ctx->my_krbtgt_number = 0;
2390 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2391 &msg,
2392 ldb_get_default_basedn(kdc_db_ctx->samdb),
2393 LDB_SCOPE_SUBTREE,
2394 krbtgt_attrs,
2395 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2396 "(&(objectClass=user)(samAccountName=krbtgt))");
2397
2398 if (ldb_ret != LDB_SUCCESS) {
2399 DEBUG(1, ("samba_kdc_fetch: could not find own KRBTGT in DB: %s\n", ldb_errstring(kdc_db_ctx->samdb)));
2400 talloc_free(kdc_db_ctx);
2401 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2402 }
2403 kdc_db_ctx->krbtgt_dn = talloc_steal(kdc_db_ctx, msg->dn);
2404 kdc_db_ctx->my_krbtgt_number = 0;
2405 talloc_free(msg);
2406 }
2407 *kdc_db_ctx_out = kdc_db_ctx;
2408 return NT_STATUS_OK;
2409 }
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