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s4:kdc: ignore empty supplementalCredentialsBlob structures
[Samba.git] / source4 / kdc / db-glue.c
blob013efbffa08207836fb07204c17869a93b657025
1 /*
2 Unix SMB/CIFS implementation.
3
4 Database Glue between Samba and the KDC
5
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2009
7 Copyright (C) Simo Sorce <idra@samba.org> 2010
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
22 */
23
24 #include "includes.h"
25 #include "libcli/security/security.h"
26 #include "auth/auth.h"
27 #include "auth/auth_sam.h"
28 #include "dsdb/samdb/samdb.h"
29 #include "dsdb/common/util.h"
30 #include "librpc/gen_ndr/ndr_drsblobs.h"
31 #include "param/param.h"
32 #include "../lib/crypto/md4.h"
33 #include "system/kerberos.h"
34 #include "auth/kerberos/kerberos.h"
35 #include "kdc/sdb.h"
36 #include "kdc/samba_kdc.h"
37 #include "kdc/db-glue.h"
38
39 #define SAMBA_KVNO_GET_KRBTGT(kvno) \
40 ((uint16_t)(((uint32_t)kvno) >> 16))
41
42 #define SAMBA_KVNO_AND_KRBTGT(kvno, krbtgt) \
43 ((krb5_kvno)((((uint32_t)kvno) & 0xFFFF) | \
44 ((((uint32_t)krbtgt) << 16) & 0xFFFF0000)))
45
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 struct SDBFlags uf2SDBFlags(krb5_context context, uint32_t userAccountControl, enum samba_kdc_ent_type ent_type)
88 {
89 struct SDBFlags flags = int2SDBFlags(0);
90
91 /* we don't allow kadmin deletes */
92 flags.immutable = 1;
93
94 /* mark the principal as invalid to start with */
95 flags.invalid = 1;
96
97 flags.renewable = 1;
98
99 /* All accounts are servers, but this may be disabled again in the caller */
100 flags.server = 1;
101
102 /* Account types - clear the invalid bit if it turns out to be valid */
103 if (userAccountControl & UF_NORMAL_ACCOUNT) {
104 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
105 flags.client = 1;
106 }
107 flags.invalid = 0;
108 }
109
110 if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
111 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
112 flags.client = 1;
113 }
114 flags.invalid = 0;
115 }
116 if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
117 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
118 flags.client = 1;
119 }
120 flags.invalid = 0;
121 }
122 if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
123 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
124 flags.client = 1;
125 }
126 flags.invalid = 0;
127 }
128
129 /* Not permitted to act as a client if disabled */
130 if (userAccountControl & UF_ACCOUNTDISABLE) {
131 flags.client = 0;
132 }
133 if (userAccountControl & UF_LOCKOUT) {
134 flags.locked_out = 1;
135 }
136 /*
137 if (userAccountControl & UF_PASSWORD_NOTREQD) {
138 flags.invalid = 1;
139 }
140 */
141 /*
142 UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent
143 */
144 if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
145 flags.invalid = 1;
146 }
147
148 /* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in samba_kdc_message2entry() */
149
150 /*
151 if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
152 flags.invalid = 1;
153 }
154 */
155 if (userAccountControl & UF_SMARTCARD_REQUIRED) {
156 flags.require_hwauth = 1;
157 }
158 if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
159 flags.ok_as_delegate = 1;
160 }
161 if (userAccountControl & UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION) {
162 /*
163 * this is confusing...
164 *
165 * UF_TRUSTED_FOR_DELEGATION
166 * => ok_as_delegate
167 *
168 * and
169 *
170 * UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION
171 * => trusted_for_delegation
172 */
173 flags.trusted_for_delegation = 1;
174 }
175 if (!(userAccountControl & UF_NOT_DELEGATED)) {
176 flags.forwardable = 1;
177 flags.proxiable = 1;
178 }
179
180 if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
181 flags.require_preauth = 0;
182 } else {
183 flags.require_preauth = 1;
184
185 }
186 return flags;
187 }
188
189 static int samba_kdc_entry_destructor(struct samba_kdc_entry *p)
190 {
191 if (p->entry_ex != NULL) {
192 struct sdb_entry_ex *entry_ex = p->entry_ex;
193 free_sdb_entry(&entry_ex->entry);
194 }
195
196 return 0;
197 }
198
199 static krb5_error_code samba_kdc_message2entry_keys(krb5_context context,
200 struct samba_kdc_db_context *kdc_db_ctx,
201 TALLOC_CTX *mem_ctx,
202 struct ldb_message *msg,
203 uint32_t rid,
204 bool is_rodc,
205 uint32_t userAccountControl,
206 enum samba_kdc_ent_type ent_type,
207 struct sdb_entry_ex *entry_ex)
208 {
209 krb5_error_code ret = 0;
210 enum ndr_err_code ndr_err;
211 struct samr_Password *hash;
212 const struct ldb_val *sc_val;
213 struct supplementalCredentialsBlob scb;
214 struct supplementalCredentialsPackage *scpk = NULL;
215 bool newer_keys = false;
216 struct package_PrimaryKerberosBlob _pkb;
217 struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
218 struct package_PrimaryKerberosCtr4 *pkb4 = NULL;
219 uint16_t i;
220 uint16_t allocated_keys = 0;
221 int rodc_krbtgt_number = 0;
222 int kvno = 0;
223 uint32_t supported_enctypes
224 = ldb_msg_find_attr_as_uint(msg,
225 "msDS-SupportedEncryptionTypes",
226 0);
227
228 if (rid == DOMAIN_RID_KRBTGT || is_rodc) {
229 /* KDCs (and KDCs on RODCs) use AES */
230 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
231 } else if (userAccountControl & (UF_PARTIAL_SECRETS_ACCOUNT|UF_SERVER_TRUST_ACCOUNT)) {
232 /* DCs and RODCs comptuer accounts use AES */
233 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
234 } else if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT ||
235 (ent_type == SAMBA_KDC_ENT_TYPE_ANY)) {
236 /* for AS-REQ the client chooses the enc types it
237 * supports, and this will vary between computers a
238 * user logs in from.
239 *
240 * likewise for 'any' return as much as is supported,
241 * to export into a keytab */
242 supported_enctypes = ENC_ALL_TYPES;
243 }
244
245 /* If UF_USE_DES_KEY_ONLY has been set, then don't allow use of the newer enc types */
246 if (userAccountControl & UF_USE_DES_KEY_ONLY) {
247 supported_enctypes = ENC_CRC32|ENC_RSA_MD5;
248 } else {
249 /* Otherwise, add in the default enc types */
250 supported_enctypes |= ENC_CRC32 | ENC_RSA_MD5 | ENC_RC4_HMAC_MD5;
251 }
252
253 /* Is this the krbtgt or a RODC krbtgt */
254 if (is_rodc) {
255 rodc_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
256
257 if (rodc_krbtgt_number == -1) {
258 return EINVAL;
259 }
260 }
261
262 entry_ex->entry.keys.val = NULL;
263 entry_ex->entry.keys.len = 0;
264 entry_ex->entry.kvno = 0;
265
266 if ((ent_type == SAMBA_KDC_ENT_TYPE_CLIENT)
267 && (userAccountControl & UF_SMARTCARD_REQUIRED)) {
268 uint8_t secretbuffer[32];
269
270 /*
271 * Fake keys until we have a better way to reject
272 * non-pkinit requests.
273 *
274 * We just need to indicate which encryption types are
275 * supported.
276 */
277 generate_secret_buffer(secretbuffer, sizeof(secretbuffer));
278
279 allocated_keys = 3;
280 entry_ex->entry.keys.len = 0;
281 entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(struct sdb_key));
282 if (entry_ex->entry.keys.val == NULL) {
283 ZERO_STRUCT(secretbuffer);
284 ret = ENOMEM;
285 goto out;
286 }
287
288 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
289 struct sdb_key key = {};
290
291 ret = smb_krb5_keyblock_init_contents(context,
292 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
293 secretbuffer, 32,
294 &key.key);
295 if (ret) {
296 ZERO_STRUCT(secretbuffer);
297 goto out;
298 }
299
300 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
301 entry_ex->entry.keys.len++;
302 }
303
304 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
305 struct sdb_key key = {};
306
307 ret = smb_krb5_keyblock_init_contents(context,
308 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
309 secretbuffer, 16,
310 &key.key);
311 if (ret) {
312 ZERO_STRUCT(secretbuffer);
313 goto out;
314 }
315
316 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
317 entry_ex->entry.keys.len++;
318 }
319
320 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
321 struct sdb_key key = {};
322
323 ret = smb_krb5_keyblock_init_contents(context,
324 ENCTYPE_ARCFOUR_HMAC,
325 secretbuffer, 16,
326 &key.key);
327 if (ret) {
328 ZERO_STRUCT(secretbuffer);
329 goto out;
330 }
331
332 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
333 entry_ex->entry.keys.len++;
334 }
335
336 ret = 0;
337 goto out;
338 }
339
340 kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
341 if (is_rodc) {
342 kvno = SAMBA_KVNO_AND_KRBTGT(kvno, rodc_krbtgt_number);
343 }
344 entry_ex->entry.kvno = kvno;
345
346 /* Get keys from the db */
347
348 hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
349 sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
350
351 /* unicodePwd for enctype 0x17 (23) if present */
352 if (hash) {
353 allocated_keys++;
354 }
355
356 /* supplementalCredentials if present */
357 if (sc_val) {
358 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, &scb,
359 (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
360 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
361 dump_data(0, sc_val->data, sc_val->length);
362 ret = EINVAL;
363 goto out;
364 }
365
366 if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) {
367 if (scb.sub.num_packages != 0) {
368 NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
369 ret = EINVAL;
370 goto out;
371 }
372 }
373
374 for (i=0; i < scb.sub.num_packages; i++) {
375 if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) {
376 scpk = &scb.sub.packages[i];
377 if (!scpk->data || !scpk->data[0]) {
378 scpk = NULL;
379 continue;
380 }
381 newer_keys = true;
382 break;
383 } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) {
384 scpk = &scb.sub.packages[i];
385 if (!scpk->data || !scpk->data[0]) {
386 scpk = NULL;
387 }
388 /*
389 * we don't break here in hope to find
390 * a Kerberos-Newer-Keys package
391 */
392 }
393 }
394 }
395 /*
396 * Primary:Kerberos-Newer-Keys or Primary:Kerberos element
397 * of supplementalCredentials
398 */
399 if (scpk) {
400 DATA_BLOB blob;
401
402 blob = strhex_to_data_blob(mem_ctx, scpk->data);
403 if (!blob.data) {
404 ret = ENOMEM;
405 goto out;
406 }
407
408 /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */
409 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &_pkb,
410 (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
411 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
412 ret = EINVAL;
413 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
414 krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
415 goto out;
416 }
417
418 if (newer_keys && _pkb.version != 4) {
419 ret = EINVAL;
420 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
421 krb5_warnx(context, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
422 goto out;
423 }
424
425 if (!newer_keys && _pkb.version != 3) {
426 ret = EINVAL;
427 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
428 krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
429 goto out;
430 }
431
432 if (_pkb.version == 4) {
433 pkb4 = &_pkb.ctr.ctr4;
434 allocated_keys += pkb4->num_keys;
435 } else if (_pkb.version == 3) {
436 pkb3 = &_pkb.ctr.ctr3;
437 allocated_keys += pkb3->num_keys;
438 }
439 }
440
441 if (allocated_keys == 0) {
442 if (kdc_db_ctx->rodc) {
443 /* We are on an RODC, but don't have keys for this account. Signal this to the caller */
444 /* TODO: We need to call a generalised version of auth_sam_trigger_repl_secret from here */
445 return SDB_ERR_NOT_FOUND_HERE;
446 }
447
448 /* oh, no password. Apparently (comment in
449 * hdb-ldap.c) this violates the ASN.1, but this
450 * allows an entry with no keys (yet). */
451 return 0;
452 }
453
454 /* allocate space to decode into */
455 entry_ex->entry.keys.len = 0;
456 entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(struct sdb_key));
457 if (entry_ex->entry.keys.val == NULL) {
458 ret = ENOMEM;
459 goto out;
460 }
461
462 if (hash && (supported_enctypes & ENC_RC4_HMAC_MD5)) {
463 struct sdb_key key = {};
464
465 ret = smb_krb5_keyblock_init_contents(context,
466 ENCTYPE_ARCFOUR_HMAC,
467 hash->hash,
468 sizeof(hash->hash),
469 &key.key);
470 if (ret) {
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
478 if (pkb4) {
479 for (i=0; i < pkb4->num_keys; i++) {
480 struct sdb_key key = {};
481
482 if (!pkb4->keys[i].value) continue;
483
484 if (!(kerberos_enctype_to_bitmap(pkb4->keys[i].keytype) & supported_enctypes)) {
485 continue;
486 }
487
488 if (pkb4->salt.string) {
489 DATA_BLOB salt;
490
491 salt = data_blob_string_const(pkb4->salt.string);
492
493 key.salt = calloc(1, sizeof(*key.salt));
494 if (key.salt == NULL) {
495 ret = ENOMEM;
496 goto out;
497 }
498
499 key.salt->type = KRB5_PW_SALT;
500
501 ret = krb5_copy_data_contents(&key.salt->salt,
502 salt.data,
503 salt.length);
504 if (ret) {
505 free(key.salt);
506 key.salt = NULL;
507 goto out;
508 }
509 }
510
511 /* TODO: maybe pass the iteration_count somehow... */
512
513 ret = smb_krb5_keyblock_init_contents(context,
514 pkb4->keys[i].keytype,
515 pkb4->keys[i].value->data,
516 pkb4->keys[i].value->length,
517 &key.key);
518 if (ret == KRB5_PROG_ETYPE_NOSUPP) {
519 DEBUG(2,("Unsupported keytype ignored - type %u\n",
520 pkb4->keys[i].keytype));
521 ret = 0;
522 continue;
523 }
524 if (ret) {
525 if (key.salt) {
526 kerberos_free_data_contents(context, &key.salt->salt);
527 free(key.salt);
528 key.salt = NULL;
529 }
530 goto out;
531 }
532
533 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
534 entry_ex->entry.keys.len++;
535 }
536 } else if (pkb3) {
537 for (i=0; i < pkb3->num_keys; i++) {
538 struct sdb_key key = {};
539
540 if (!pkb3->keys[i].value) continue;
541
542 if (!(kerberos_enctype_to_bitmap(pkb3->keys[i].keytype) & supported_enctypes)) {
543 continue;
544 }
545
546 if (pkb3->salt.string) {
547 DATA_BLOB salt;
548
549 salt = data_blob_string_const(pkb3->salt.string);
550
551 key.salt = calloc(1, sizeof(*key.salt));
552 if (key.salt == NULL) {
553 ret = ENOMEM;
554 goto out;
555 }
556
557 key.salt->type = KRB5_PW_SALT;
558
559 ret = krb5_copy_data_contents(&key.salt->salt,
560 salt.data,
561 salt.length);
562 if (ret) {
563 free(key.salt);
564 key.salt = NULL;
565 goto out;
566 }
567 }
568
569 ret = smb_krb5_keyblock_init_contents(context,
570 pkb3->keys[i].keytype,
571 pkb3->keys[i].value->data,
572 pkb3->keys[i].value->length,
573 &key.key);
574 if (ret) {
575 if (key.salt) {
576 kerberos_free_data_contents(context, &key.salt->salt);
577 free(key.salt);
578 key.salt = NULL;
579 }
580 goto out;
581 }
582
583 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
584 entry_ex->entry.keys.len++;
585 }
586 }
587
588 out:
589 if (ret != 0) {
590 entry_ex->entry.keys.len = 0;
591 }
592 if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
593 free(entry_ex->entry.keys.val);
594 entry_ex->entry.keys.val = NULL;
595 }
596 return ret;
597 }
598
599 static int principal_comp_strcmp_int(krb5_context context,
600 krb5_const_principal principal,
601 unsigned int component,
602 const char *string,
603 bool do_strcasecmp)
604 {
605 const char *p;
606 size_t len;
607
608 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
609 p = krb5_principal_get_comp_string(context, principal, component);
610 if (p == NULL) {
611 return -1;
612 }
613 len = strlen(p);
614 #else
615 krb5_data *d;
616 if (component >= krb5_princ_size(context, principal)) {
617 return -1;
618 }
619
620 d = krb5_princ_component(context, principal, component);
621 if (d == NULL) {
622 return -1;
623 }
624
625 p = d->data;
626 len = d->length;
627 #endif
628 if (do_strcasecmp) {
629 return strncasecmp(p, string, len);
630 } else {
631 return strncmp(p, string, len);
632 }
633 }
634
635 static int principal_comp_strcasecmp(krb5_context context,
636 krb5_const_principal principal,
637 unsigned int component,
638 const char *string)
639 {
640 return principal_comp_strcmp_int(context, principal,
641 component, string, true);
642 }
643
644 static int principal_comp_strcmp(krb5_context context,
645 krb5_const_principal principal,
646 unsigned int component,
647 const char *string)
648 {
649 return principal_comp_strcmp_int(context, principal,
650 component, string, false);
651 }
652
653 /*
654 * Construct an hdb_entry from a directory entry.
655 */
656 static krb5_error_code samba_kdc_message2entry(krb5_context context,
657 struct samba_kdc_db_context *kdc_db_ctx,
658 TALLOC_CTX *mem_ctx,
659 krb5_const_principal principal,
660 enum samba_kdc_ent_type ent_type,
661 unsigned flags,
662 struct ldb_dn *realm_dn,
663 struct ldb_message *msg,
664 struct sdb_entry_ex *entry_ex)
665 {
666 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
667 uint32_t userAccountControl;
668 uint32_t msDS_User_Account_Control_Computed;
669 unsigned int i;
670 krb5_error_code ret = 0;
671 krb5_boolean is_computer = FALSE;
672
673 struct samba_kdc_entry *p;
674 NTTIME acct_expiry;
675 NTSTATUS status;
676
677 uint32_t rid;
678 bool is_rodc = false;
679 struct ldb_message_element *objectclasses;
680 struct ldb_val computer_val;
681 const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
682 computer_val.data = discard_const_p(uint8_t,"computer");
683 computer_val.length = strlen((const char *)computer_val.data);
684
685 if (ldb_msg_find_element(msg, "msDS-SecondaryKrbTgtNumber")) {
686 is_rodc = true;
687 }
688
689 if (!samAccountName) {
690 ret = ENOENT;
691 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no samAccountName present");
692 goto out;
693 }
694
695 objectclasses = ldb_msg_find_element(msg, "objectClass");
696
697 if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
698 is_computer = TRUE;
699 }
700
701 ZERO_STRUCTP(entry_ex);
702
703 p = talloc_zero(mem_ctx, struct samba_kdc_entry);
704 if (!p) {
705 ret = ENOMEM;
706 goto out;
707 }
708
709 p->kdc_db_ctx = kdc_db_ctx;
710 p->realm_dn = talloc_reference(p, realm_dn);
711 if (!p->realm_dn) {
712 ret = ENOMEM;
713 goto out;
714 }
715
716 talloc_set_destructor(p, samba_kdc_entry_destructor);
717
718 entry_ex->ctx = p;
719
720 userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
721
722 msDS_User_Account_Control_Computed
723 = ldb_msg_find_attr_as_uint(msg,
724 "msDS-User-Account-Control-Computed",
725 UF_ACCOUNTDISABLE);
726
727 /*
728 * This brings in the lockout flag, block the account if not
729 * found. We need the weird UF_ACCOUNTDISABLE check because
730 * we do not want to fail open if the value is not returned,
731 * but 0 is a valid value (all OK)
732 */
733 if (msDS_User_Account_Control_Computed == UF_ACCOUNTDISABLE) {
734 ret = EINVAL;
735 krb5_set_error_message(context, ret, "samba_kdc_message2entry: "
736 "no msDS-User-Account-Control-Computed present");
737 goto out;
738 } else {
739 userAccountControl |= msDS_User_Account_Control_Computed;
740 }
741
742 /*
743 * If we are set to canonicalize, we get back the fixed UPPER
744 * case realm, and the real username (ie matching LDAP
745 * samAccountName)
746 *
747 * Otherwise, if we are set to enterprise, we
748 * get back the whole principal as-sent
749 *
750 * Finally, if we are not set to canonicalize, we get back the
751 * fixed UPPER case realm, but the as-sent username
752 */
753
754 if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT) {
755 if (flags & (SDB_F_CANON)) {
756 /*
757 * When requested to do so, ensure that the
758 * both realm values in the principal are set
759 * to the upper case, canonical realm
760 */
761 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal,
762 lpcfg_realm(lp_ctx), "krbtgt",
763 lpcfg_realm(lp_ctx), NULL);
764 if (ret) {
765 krb5_clear_error_message(context);
766 goto out;
767 }
768 smb_krb5_principal_set_type(context, entry_ex->entry.principal, KRB5_NT_SRV_INST);
769 } else {
770 ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
771 if (ret) {
772 krb5_clear_error_message(context);
773 goto out;
774 }
775 /*
776 * this appears to be required regardless of
777 * the canonicalize flag from the client
778 */
779 ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
780 if (ret) {
781 krb5_clear_error_message(context);
782 goto out;
783 }
784 }
785
786 } else if (ent_type == SAMBA_KDC_ENT_TYPE_ANY && principal == NULL) {
787 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
788 if (ret) {
789 krb5_clear_error_message(context);
790 goto out;
791 }
792 } else if (flags & SDB_F_CANON && flags & SDB_F_FOR_AS_REQ) {
793 /*
794 * SDB_F_CANON maps from the canonicalize flag in the
795 * packet, and has a different meaning between AS-REQ
796 * and TGS-REQ. We only change the principal in the AS-REQ case
797 */
798 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
799 if (ret) {
800 krb5_clear_error_message(context);
801 goto out;
802 }
803 } else {
804 ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
805 if (ret) {
806 krb5_clear_error_message(context);
807 goto out;
808 }
809
810 if (smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL) {
811 /* While we have copied the client principal, tests
812 * show that Win2k3 returns the 'corrected' realm, not
813 * the client-specified realm. This code attempts to
814 * replace the client principal's realm with the one
815 * we determine from our records */
816
817 /* this has to be with malloc() */
818 ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
819 if (ret) {
820 krb5_clear_error_message(context);
821 goto out;
822 }
823 }
824 }
825
826 /* First try and figure out the flags based on the userAccountControl */
827 entry_ex->entry.flags = uf2SDBFlags(context, userAccountControl, ent_type);
828
829 /* Windows 2008 seems to enforce this (very sensible) rule by
830 * default - don't allow offline attacks on a user's password
831 * by asking for a ticket to them as a service (encrypted with
832 * their probably patheticly insecure password) */
833
834 if (entry_ex->entry.flags.server
835 && lpcfg_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
836 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
837 entry_ex->entry.flags.server = 0;
838 }
839 }
840 /*
841 * To give the correct type of error to the client, we must
842 * not just return the entry without .server set, we must
843 * pretend the principal does not exist. Otherwise we may
844 * return ERR_POLICY instead of
845 * KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
846 */
847 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER && entry_ex->entry.flags.server == 0) {
848 ret = SDB_ERR_NOENTRY;
849 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no servicePrincipalName present for this server, refusing with no-such-entry");
850 goto out;
851 }
852 if (flags & SDB_F_ADMIN_DATA) {
853 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
854 * of the Heimdal KDC. They are stored in a the traditional
855 * DB for audit purposes, and still form part of the structure
856 * we must return */
857
858 /* use 'whenCreated' */
859 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
860 /* use 'kadmin' for now (needed by mit_samba) */
861
862 ret = smb_krb5_make_principal(context,
863 &entry_ex->entry.created_by.principal,
864 lpcfg_realm(lp_ctx), "kadmin", NULL);
865 if (ret) {
866 krb5_clear_error_message(context);
867 goto out;
868 }
869
870 entry_ex->entry.modified_by = (struct sdb_event *) malloc(sizeof(struct sdb_event));
871 if (entry_ex->entry.modified_by == NULL) {
872 ret = ENOMEM;
873 krb5_set_error_message(context, ret, "malloc: out of memory");
874 goto out;
875 }
876
877 /* use 'whenChanged' */
878 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
879 /* use 'kadmin' for now (needed by mit_samba) */
880 ret = smb_krb5_make_principal(context,
881 &entry_ex->entry.modified_by->principal,
882 lpcfg_realm(lp_ctx), "kadmin", NULL);
883 if (ret) {
884 krb5_clear_error_message(context);
885 goto out;
886 }
887 }
888
889
890 /* The lack of password controls etc applies to krbtgt by
891 * virtue of being that particular RID */
892 status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
893
894 if (!NT_STATUS_IS_OK(status)) {
895 ret = EINVAL;
896 goto out;
897 }
898
899 if (rid == DOMAIN_RID_KRBTGT) {
900 char *realm = NULL;
901
902 entry_ex->entry.valid_end = NULL;
903 entry_ex->entry.pw_end = NULL;
904
905 entry_ex->entry.flags.invalid = 0;
906 entry_ex->entry.flags.server = 1;
907
908 realm = smb_krb5_principal_get_realm(context, principal);
909 if (realm == NULL) {
910 ret = ENOMEM;
911 goto out;
912 }
913
914 /* Don't mark all requests for the krbtgt/realm as
915 * 'change password', as otherwise we could get into
916 * trouble, and not enforce the password expirty.
917 * Instead, only do it when request is for the kpasswd service */
918 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER
919 && krb5_princ_size(context, principal) == 2
920 && (principal_comp_strcmp(context, principal, 0, "kadmin") == 0)
921 && (principal_comp_strcmp(context, principal, 1, "changepw") == 0)
922 && lpcfg_is_my_domain_or_realm(lp_ctx, realm)) {
923 entry_ex->entry.flags.change_pw = 1;
924 }
925
926 SAFE_FREE(realm);
927
928 entry_ex->entry.flags.client = 0;
929 entry_ex->entry.flags.forwardable = 1;
930 entry_ex->entry.flags.ok_as_delegate = 1;
931 } else if (is_rodc) {
932 /* The RODC krbtgt account is like the main krbtgt,
933 * but it does not have a changepw or kadmin
934 * service */
935
936 entry_ex->entry.valid_end = NULL;
937 entry_ex->entry.pw_end = NULL;
938
939 /* Also don't allow the RODC krbtgt to be a client (it should not be needed) */
940 entry_ex->entry.flags.client = 0;
941 entry_ex->entry.flags.invalid = 0;
942 entry_ex->entry.flags.server = 1;
943
944 entry_ex->entry.flags.client = 0;
945 entry_ex->entry.flags.forwardable = 1;
946 entry_ex->entry.flags.ok_as_delegate = 0;
947 } else if (entry_ex->entry.flags.server && ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
948 /* The account/password expiry only applies when the account is used as a
949 * client (ie password login), not when used as a server */
950
951 /* Make very well sure we don't use this for a client,
952 * it could bypass the password restrictions */
953 entry_ex->entry.flags.client = 0;
954
955 entry_ex->entry.valid_end = NULL;
956 entry_ex->entry.pw_end = NULL;
957
958 } else {
959 NTTIME must_change_time
960 = samdb_result_nttime(msg,
961 "msDS-UserPasswordExpiryTimeComputed",
962 0);
963 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
964 entry_ex->entry.pw_end = NULL;
965 } else {
966 entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
967 if (entry_ex->entry.pw_end == NULL) {
968 ret = ENOMEM;
969 goto out;
970 }
971 *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
972 }
973
974 acct_expiry = samdb_result_account_expires(msg);
975 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
976 entry_ex->entry.valid_end = NULL;
977 } else {
978 entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
979 if (entry_ex->entry.valid_end == NULL) {
980 ret = ENOMEM;
981 goto out;
982 }
983 *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
984 }
985 }
986
987 entry_ex->entry.valid_start = NULL;
988
989 entry_ex->entry.max_life = malloc(sizeof(*entry_ex->entry.max_life));
990 if (entry_ex->entry.max_life == NULL) {
991 ret = ENOMEM;
992 goto out;
993 }
994
995 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
996 *entry_ex->entry.max_life = kdc_db_ctx->policy.svc_tkt_lifetime;
997 } else if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT || ent_type == SAMBA_KDC_ENT_TYPE_CLIENT) {
998 *entry_ex->entry.max_life = kdc_db_ctx->policy.usr_tkt_lifetime;
999 } else {
1000 *entry_ex->entry.max_life = MIN(kdc_db_ctx->policy.svc_tkt_lifetime,
1001 kdc_db_ctx->policy.usr_tkt_lifetime);
1002 }
1003
1004 entry_ex->entry.max_renew = malloc(sizeof(*entry_ex->entry.max_life));
1005 if (entry_ex->entry.max_renew == NULL) {
1006 ret = ENOMEM;
1007 goto out;
1008 }
1009
1010 *entry_ex->entry.max_renew = kdc_db_ctx->policy.renewal_lifetime;
1011
1012 /* Get keys from the db */
1013 ret = samba_kdc_message2entry_keys(context, kdc_db_ctx, p, msg,
1014 rid, is_rodc, userAccountControl,
1015 ent_type, entry_ex);
1016 if (ret) {
1017 /* Could be bogus data in the entry, or out of memory */
1018 goto out;
1019 }
1020
1021 entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
1022 if (entry_ex->entry.etypes == NULL) {
1023 krb5_clear_error_message(context);
1024 ret = ENOMEM;
1025 goto out;
1026 }
1027 entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
1028 entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
1029 if (entry_ex->entry.etypes->val == NULL) {
1030 krb5_clear_error_message(context);
1031 ret = ENOMEM;
1032 goto out;
1033 }
1034 for (i=0; i < entry_ex->entry.etypes->len; i++) {
1035 entry_ex->entry.etypes->val[i] = KRB5_KEY_TYPE(&entry_ex->entry.keys.val[i].key);
1036 }
1037
1038
1039 p->msg = talloc_steal(p, msg);
1040
1041 out:
1042 if (ret != 0) {
1043 /* This doesn't free ent itself, that is for the eventual caller to do */
1044 sdb_free_entry(entry_ex);
1045 ZERO_STRUCTP(entry_ex);
1046 } else {
1047 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1048 }
1049
1050 return ret;
1051 }
1052
1053 /*
1054 * Construct an hdb_entry from a directory entry.
1055 * The kvno is what the remote client asked for
1056 */
1057 static krb5_error_code samba_kdc_trust_message2entry(krb5_context context,
1058 struct samba_kdc_db_context *kdc_db_ctx,
1059 TALLOC_CTX *mem_ctx, krb5_const_principal principal,
1060 enum trust_direction direction,
1061 struct ldb_dn *realm_dn,
1062 unsigned flags,
1063 uint32_t kvno,
1064 struct ldb_message *msg,
1065 struct sdb_entry_ex *entry_ex)
1066 {
1067 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1068 const char *our_realm = lpcfg_realm(lp_ctx);
1069 const char *dnsdomain = NULL;
1070 char *partner_realm = NULL;
1071 const char *realm = NULL;
1072 const char *krbtgt_realm = NULL;
1073 DATA_BLOB password_utf16 = data_blob_null;
1074 DATA_BLOB password_utf8 = data_blob_null;
1075 struct samr_Password _password_hash;
1076 const struct samr_Password *password_hash = NULL;
1077 const struct ldb_val *password_val;
1078 struct trustAuthInOutBlob password_blob;
1079 struct samba_kdc_entry *p;
1080 bool use_previous = false;
1081 uint32_t current_kvno;
1082 uint32_t previous_kvno;
1083 uint32_t num_keys = 0;
1084 enum ndr_err_code ndr_err;
1085 int ret, trust_direction_flags;
1086 unsigned int i;
1087 struct AuthenticationInformationArray *auth_array;
1088 struct timeval tv;
1089 NTTIME an_hour_ago;
1090 uint32_t *auth_kvno;
1091 bool preferr_current = false;
1092 uint32_t supported_enctypes = ENC_RC4_HMAC_MD5;
1093
1094 if (dsdb_functional_level(kdc_db_ctx->samdb) >= DS_DOMAIN_FUNCTION_2008) {
1095 supported_enctypes = ldb_msg_find_attr_as_uint(msg,
1096 "msDS-SupportedEncryptionTypes",
1097 supported_enctypes);
1098 }
1099
1100 trust_direction_flags = ldb_msg_find_attr_as_int(msg, "trustDirection", 0);
1101 if (!(trust_direction_flags & direction)) {
1102 krb5_clear_error_message(context);
1103 ret = SDB_ERR_NOENTRY;
1104 goto out;
1105 }
1106
1107 dnsdomain = ldb_msg_find_attr_as_string(msg, "trustPartner", NULL);
1108 if (dnsdomain == NULL) {
1109 krb5_clear_error_message(context);
1110 ret = SDB_ERR_NOENTRY;
1111 goto out;
1112 }
1113 partner_realm = strupper_talloc(mem_ctx, dnsdomain);
1114 if (partner_realm == NULL) {
1115 krb5_clear_error_message(context);
1116 ret = ENOMEM;
1117 goto out;
1118 }
1119
1120 if (direction == INBOUND) {
1121 realm = our_realm;
1122 krbtgt_realm = partner_realm;
1123
1124 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
1125 } else { /* OUTBOUND */
1126 realm = partner_realm;
1127 krbtgt_realm = our_realm;
1128
1129 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
1130 }
1131
1132 if (password_val == NULL) {
1133 krb5_clear_error_message(context);
1134 ret = SDB_ERR_NOENTRY;
1135 goto out;
1136 }
1137
1138 ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, &password_blob,
1139 (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
1140 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1141 krb5_clear_error_message(context);
1142 ret = EINVAL;
1143 goto out;
1144 }
1145
1146 p = talloc(mem_ctx, struct samba_kdc_entry);
1147 if (!p) {
1148 ret = ENOMEM;
1149 goto out;
1150 }
1151
1152 p->kdc_db_ctx = kdc_db_ctx;
1153 p->realm_dn = realm_dn;
1154
1155 talloc_set_destructor(p, samba_kdc_entry_destructor);
1156
1157 /* make sure we do not have bogus data in there */
1158 memset(&entry_ex->entry, 0, sizeof(struct sdb_entry));
1159
1160 entry_ex->ctx = p;
1161
1162 /* use 'whenCreated' */
1163 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
1164 /* use 'kadmin' for now (needed by mit_samba) */
1165 ret = smb_krb5_make_principal(context,
1166 &entry_ex->entry.created_by.principal,
1167 realm, "kadmin", NULL);
1168 if (ret) {
1169 krb5_clear_error_message(context);
1170 goto out;
1171 }
1172
1173 /*
1174 * We always need to generate the canonicalized principal
1175 * with the values of our database.
1176 */
1177 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, realm,
1178 "krbtgt", krbtgt_realm, NULL);
1179 if (ret) {
1180 krb5_clear_error_message(context);
1181 goto out;
1182 }
1183 smb_krb5_principal_set_type(context, entry_ex->entry.principal,
1184 KRB5_NT_SRV_INST);
1185
1186 entry_ex->entry.valid_start = NULL;
1187
1188 /* we need to work out if we are going to use the current or
1189 * the previous password hash.
1190 * We base this on the kvno the client passes in. If the kvno
1191 * passed in is equal to the current kvno in our database then
1192 * we use the current structure. If it is the current kvno-1,
1193 * then we use the previous substrucure.
1194 */
1195
1196 /*
1197 * Windows preferrs the previous key for one hour.
1198 */
1199 tv = timeval_current();
1200 if (tv.tv_sec > 3600) {
1201 tv.tv_sec -= 3600;
1202 }
1203 an_hour_ago = timeval_to_nttime(&tv);
1204
1205 /* first work out the current kvno */
1206 current_kvno = 0;
1207 for (i=0; i < password_blob.count; i++) {
1208 struct AuthenticationInformation *a =
1209 &password_blob.current.array[i];
1210
1211 if (a->LastUpdateTime <= an_hour_ago) {
1212 preferr_current = true;
1213 }
1214
1215 if (a->AuthType == TRUST_AUTH_TYPE_VERSION) {
1216 current_kvno = a->AuthInfo.version.version;
1217 }
1218 }
1219 if (current_kvno == 0) {
1220 previous_kvno = 255;
1221 } else {
1222 previous_kvno = current_kvno - 1;
1223 }
1224 for (i=0; i < password_blob.count; i++) {
1225 struct AuthenticationInformation *a =
1226 &password_blob.previous.array[i];
1227
1228 if (a->AuthType == TRUST_AUTH_TYPE_VERSION) {
1229 previous_kvno = a->AuthInfo.version.version;
1230 }
1231 }
1232
1233 /* work out whether we will use the previous or current
1234 password */
1235 if (password_blob.previous.count == 0) {
1236 /* there is no previous password */
1237 use_previous = false;
1238 } else if (!(flags & SDB_F_KVNO_SPECIFIED)) {
1239 /*
1240 * If not specified we use the lowest kvno
1241 * for the first hour after an update.
1242 */
1243 if (preferr_current) {
1244 use_previous = false;
1245 } else if (previous_kvno < current_kvno) {
1246 use_previous = true;
1247 } else {
1248 use_previous = false;
1249 }
1250 } else if (kvno == current_kvno) {
1251 /*
1252 * Exact match ...
1253 */
1254 use_previous = false;
1255 } else if (kvno == previous_kvno) {
1256 /*
1257 * Exact match ...
1258 */
1259 use_previous = true;
1260 } else {
1261 /*
1262 * Fallback to the current one for anything else
1263 */
1264 use_previous = false;
1265 }
1266
1267 if (use_previous) {
1268 auth_array = &password_blob.previous;
1269 auth_kvno = &previous_kvno;
1270 } else {
1271 auth_array = &password_blob.current;
1272 auth_kvno = &current_kvno;
1273 }
1274
1275 /* use the kvno the client specified, if available */
1276 if (flags & SDB_F_KVNO_SPECIFIED) {
1277 entry_ex->entry.kvno = kvno;
1278 } else {
1279 entry_ex->entry.kvno = *auth_kvno;
1280 }
1281
1282 for (i=0; i < auth_array->count; i++) {
1283 if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
1284 bool ok;
1285
1286 password_utf16 = data_blob_const(auth_array->array[i].AuthInfo.clear.password,
1287 auth_array->array[i].AuthInfo.clear.size);
1288 if (password_utf16.length == 0) {
1289 break;
1290 }
1291
1292 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1293 mdfour(_password_hash.hash, password_utf16.data, password_utf16.length);
1294 if (password_hash == NULL) {
1295 num_keys += 1;
1296 }
1297 password_hash = &_password_hash;
1298 }
1299
1300 if (!(supported_enctypes & (ENC_HMAC_SHA1_96_AES128|ENC_HMAC_SHA1_96_AES256))) {
1301 break;
1302 }
1303
1304 ok = convert_string_talloc(mem_ctx,
1305 CH_UTF16MUNGED, CH_UTF8,
1306 password_utf16.data,
1307 password_utf16.length,
1308 (void *)&password_utf8.data,
1309 &password_utf8.length);
1310 if (!ok) {
1311 krb5_clear_error_message(context);
1312 ret = ENOMEM;
1313 goto out;
1314 }
1315
1316 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1317 num_keys += 1;
1318 }
1319 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1320 num_keys += 1;
1321 }
1322 break;
1323 } else if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
1324 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1325 password_hash = &auth_array->array[i].AuthInfo.nt4owf.password;
1326 num_keys += 1;
1327 }
1328 }
1329 }
1330
1331 /* Must have found a cleartext or MD4 password */
1332 if (num_keys == 0) {
1333 DEBUG(1,(__location__ ": no usable key found\n"));
1334 krb5_clear_error_message(context);
1335 ret = SDB_ERR_NOENTRY;
1336 goto out;
1337 }
1338
1339 entry_ex->entry.keys.val = calloc(num_keys, sizeof(struct sdb_key));
1340 if (entry_ex->entry.keys.val == NULL) {
1341 krb5_clear_error_message(context);
1342 ret = ENOMEM;
1343 goto out;
1344 }
1345
1346 if (password_utf8.length != 0) {
1347 struct sdb_key key = {};
1348 krb5_const_principal salt_principal = entry_ex->entry.principal;
1349 krb5_data salt;
1350 krb5_data cleartext_data;
1351
1352 cleartext_data.data = discard_const_p(char, password_utf8.data);
1353 cleartext_data.length = password_utf8.length;
1354
1355 ret = smb_krb5_get_pw_salt(context,
1356 salt_principal,
1357 &salt);
1358 if (ret != 0) {
1359 goto out;
1360 }
1361
1362 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1363 ret = smb_krb5_create_key_from_string(context,
1364 salt_principal,
1365 &salt,
1366 &cleartext_data,
1367 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
1368 &key.key);
1369 if (ret != 0) {
1370 kerberos_free_data_contents(context, &salt);
1371 goto out;
1372 }
1373
1374 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1375 entry_ex->entry.keys.len++;
1376 }
1377
1378 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1379 ret = smb_krb5_create_key_from_string(context,
1380 salt_principal,
1381 &salt,
1382 &cleartext_data,
1383 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
1384 &key.key);
1385 if (ret != 0) {
1386 kerberos_free_data_contents(context, &salt);
1387 goto out;
1388 }
1389
1390 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1391 entry_ex->entry.keys.len++;
1392 }
1393
1394 kerberos_free_data_contents(context, &salt);
1395 }
1396
1397 if (password_hash != NULL) {
1398 struct sdb_key key = {};
1399
1400 ret = smb_krb5_keyblock_init_contents(context,
1401 ENCTYPE_ARCFOUR_HMAC,
1402 password_hash->hash,
1403 sizeof(password_hash->hash),
1404 &key.key);
1405 if (ret != 0) {
1406 goto out;
1407 }
1408
1409 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1410 entry_ex->entry.keys.len++;
1411 }
1412
1413 entry_ex->entry.flags = int2SDBFlags(0);
1414 entry_ex->entry.flags.immutable = 1;
1415 entry_ex->entry.flags.invalid = 0;
1416 entry_ex->entry.flags.server = 1;
1417 entry_ex->entry.flags.require_preauth = 1;
1418
1419 entry_ex->entry.pw_end = NULL;
1420
1421 entry_ex->entry.max_life = NULL;
1422
1423 entry_ex->entry.max_renew = NULL;
1424
1425 entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
1426 if (entry_ex->entry.etypes == NULL) {
1427 krb5_clear_error_message(context);
1428 ret = ENOMEM;
1429 goto out;
1430 }
1431 entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
1432 entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
1433 if (entry_ex->entry.etypes->val == NULL) {
1434 krb5_clear_error_message(context);
1435 ret = ENOMEM;
1436 goto out;
1437 }
1438 for (i=0; i < entry_ex->entry.etypes->len; i++) {
1439 entry_ex->entry.etypes->val[i] = KRB5_KEY_TYPE(&entry_ex->entry.keys.val[i].key);
1440 }
1441
1442 p->msg = talloc_steal(p, msg);
1443
1444 out:
1445 TALLOC_FREE(partner_realm);
1446
1447 if (ret != 0) {
1448 /* This doesn't free ent itself, that is for the eventual caller to do */
1449 sdb_free_entry(entry_ex);
1450 } else {
1451 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1452 }
1453
1454 return ret;
1455
1456 }
1457
1458 static krb5_error_code samba_kdc_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
1459 TALLOC_CTX *mem_ctx,
1460 const char *realm,
1461 struct ldb_dn *realm_dn,
1462 struct ldb_message **pmsg)
1463 {
1464 NTSTATUS status;
1465 const char * const *attrs = trust_attrs;
1466
1467 status = dsdb_trust_search_tdo(ldb_ctx, realm, realm,
1468 attrs, mem_ctx, pmsg);
1469 if (NT_STATUS_IS_OK(status)) {
1470 return 0;
1471 } else if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1472 return SDB_ERR_NOENTRY;
1473 } else if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1474 int ret = ENOMEM;
1475 krb5_set_error_message(context, ret, "get_sam_result_trust: out of memory");
1476 return ret;
1477 } else {
1478 int ret = EINVAL;
1479 krb5_set_error_message(context, ret, "get_sam_result_trust: %s", nt_errstr(status));
1480 return ret;
1481 }
1482 }
1483
1484 static krb5_error_code samba_kdc_lookup_client(krb5_context context,
1485 struct samba_kdc_db_context *kdc_db_ctx,
1486 TALLOC_CTX *mem_ctx,
1487 krb5_const_principal principal,
1488 const char **attrs,
1489 struct ldb_dn **realm_dn,
1490 struct ldb_message **msg)
1491 {
1492 NTSTATUS nt_status;
1493 char *principal_string = NULL;
1494
1495 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1496 principal_string = smb_krb5_principal_get_comp_string(mem_ctx, context,
1497 principal, 0);
1498 if (principal_string == NULL) {
1499 return ENOMEM;
1500 }
1501 } else {
1502 char *principal_string_m = NULL;
1503 krb5_error_code ret;
1504
1505 ret = krb5_unparse_name(context, principal, &principal_string_m);
1506 if (ret != 0) {
1507 return ret;
1508 }
1509
1510 principal_string = talloc_strdup(mem_ctx, principal_string_m);
1511 SAFE_FREE(principal_string_m);
1512 if (principal_string == NULL) {
1513 return ENOMEM;
1514 }
1515 }
1516
1517 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1518 mem_ctx, principal_string, attrs,
1519 realm_dn, msg);
1520 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1521 krb5_principal fallback_principal = NULL;
1522 unsigned int num_comp;
1523 char *fallback_realm = NULL;
1524 char *fallback_account = NULL;
1525 krb5_error_code ret;
1526
1527 ret = krb5_parse_name(context, principal_string,
1528 &fallback_principal);
1529 TALLOC_FREE(principal_string);
1530 if (ret != 0) {
1531 return ret;
1532 }
1533
1534 num_comp = krb5_princ_size(context, fallback_principal);
1535 fallback_realm = smb_krb5_principal_get_realm(context,
1536 fallback_principal);
1537 if (fallback_realm == NULL) {
1538 krb5_free_principal(context, fallback_principal);
1539 return ENOMEM;
1540 }
1541
1542 if (num_comp == 1) {
1543 size_t len;
1544
1545 fallback_account = smb_krb5_principal_get_comp_string(mem_ctx,
1546 context, fallback_principal, 0);
1547 if (fallback_account == NULL) {
1548 krb5_free_principal(context, fallback_principal);
1549 SAFE_FREE(fallback_realm);
1550 return ENOMEM;
1551 }
1552
1553 len = strlen(fallback_account);
1554 if (len >= 2 && fallback_account[len - 1] == '$') {
1555 TALLOC_FREE(fallback_account);
1556 }
1557 }
1558 krb5_free_principal(context, fallback_principal);
1559 fallback_principal = NULL;
1560
1561 if (fallback_account != NULL) {
1562 char *with_dollar;
1563
1564 with_dollar = talloc_asprintf(mem_ctx, "%s$",
1565 fallback_account);
1566 if (with_dollar == NULL) {
1567 SAFE_FREE(fallback_realm);
1568 return ENOMEM;
1569 }
1570 TALLOC_FREE(fallback_account);
1571
1572 ret = smb_krb5_make_principal(context,
1573 &fallback_principal,
1574 fallback_realm,
1575 with_dollar, NULL);
1576 TALLOC_FREE(with_dollar);
1577 if (ret != 0) {
1578 SAFE_FREE(fallback_realm);
1579 return ret;
1580 }
1581 }
1582 SAFE_FREE(fallback_realm);
1583
1584 if (fallback_principal != NULL) {
1585 char *fallback_string = NULL;
1586
1587 ret = krb5_unparse_name(context,
1588 fallback_principal,
1589 &fallback_string);
1590 if (ret != 0) {
1591 krb5_free_principal(context, fallback_principal);
1592 return ret;
1593 }
1594
1595 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1596 mem_ctx,
1597 fallback_string,
1598 attrs,
1599 realm_dn, msg);
1600 SAFE_FREE(fallback_string);
1601 }
1602 krb5_free_principal(context, fallback_principal);
1603 fallback_principal = NULL;
1604 }
1605 TALLOC_FREE(principal_string);
1606
1607 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1608 return SDB_ERR_NOENTRY;
1609 } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1610 return ENOMEM;
1611 } else if (!NT_STATUS_IS_OK(nt_status)) {
1612 return EINVAL;
1613 }
1614
1615 return 0;
1616 }
1617
1618 static krb5_error_code samba_kdc_fetch_client(krb5_context context,
1619 struct samba_kdc_db_context *kdc_db_ctx,
1620 TALLOC_CTX *mem_ctx,
1621 krb5_const_principal principal,
1622 unsigned flags,
1623 struct sdb_entry_ex *entry_ex) {
1624 struct ldb_dn *realm_dn;
1625 krb5_error_code ret;
1626 struct ldb_message *msg = NULL;
1627
1628 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1629 mem_ctx, principal, user_attrs,
1630 &realm_dn, &msg);
1631 if (ret != 0) {
1632 return ret;
1633 }
1634
1635 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1636 principal, SAMBA_KDC_ENT_TYPE_CLIENT,
1637 flags,
1638 realm_dn, msg, entry_ex);
1639 return ret;
1640 }
1641
1642 static krb5_error_code samba_kdc_fetch_krbtgt(krb5_context context,
1643 struct samba_kdc_db_context *kdc_db_ctx,
1644 TALLOC_CTX *mem_ctx,
1645 krb5_const_principal principal,
1646 unsigned flags,
1647 uint32_t kvno,
1648 struct sdb_entry_ex *entry_ex)
1649 {
1650 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1651 krb5_error_code ret;
1652 struct ldb_message *msg = NULL;
1653 struct ldb_dn *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1654 char *realm_from_princ, *realm_from_princ_malloc;
1655 char *realm_princ_comp = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 1);
1656
1657 realm_from_princ_malloc = smb_krb5_principal_get_realm(context, principal);
1658 if (realm_from_princ_malloc == NULL) {
1659 /* can't happen */
1660 return SDB_ERR_NOENTRY;
1661 }
1662 realm_from_princ = talloc_strdup(mem_ctx, realm_from_princ_malloc);
1663 free(realm_from_princ_malloc);
1664 if (realm_from_princ == NULL) {
1665 return SDB_ERR_NOENTRY;
1666 }
1667
1668 if (krb5_princ_size(context, principal) != 2
1669 || (principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME) != 0)) {
1670 /* Not a krbtgt */
1671 return SDB_ERR_NOENTRY;
1672 }
1673
1674 /* krbtgt case. Either us or a trusted realm */
1675
1676 if (lpcfg_is_my_domain_or_realm(lp_ctx, realm_from_princ)
1677 && lpcfg_is_my_domain_or_realm(lp_ctx, realm_princ_comp)) {
1678 /* us, or someone quite like us */
1679 /* Cludge, cludge cludge. If the realm part of krbtgt/realm,
1680 * is in our db, then direct the caller at our primary
1681 * krbtgt */
1682
1683 int lret;
1684 unsigned int krbtgt_number;
1685 /* w2k8r2 sometimes gives us a kvno of 255 for inter-domain
1686 trust tickets. We don't yet know what this means, but we do
1687 seem to need to treat it as unspecified */
1688 if (flags & SDB_F_KVNO_SPECIFIED) {
1689 krbtgt_number = SAMBA_KVNO_GET_KRBTGT(kvno);
1690 if (kdc_db_ctx->rodc) {
1691 if (krbtgt_number != kdc_db_ctx->my_krbtgt_number) {
1692 return SDB_ERR_NOT_FOUND_HERE;
1693 }
1694 }
1695 } else {
1696 krbtgt_number = kdc_db_ctx->my_krbtgt_number;
1697 }
1698
1699 if (krbtgt_number == kdc_db_ctx->my_krbtgt_number) {
1700 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1701 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
1702 krbtgt_attrs, DSDB_SEARCH_NO_GLOBAL_CATALOG,
1703 "(objectClass=user)");
1704 } else {
1705 /* We need to look up an RODC krbtgt (perhaps
1706 * ours, if we are an RODC, perhaps another
1707 * RODC if we are a read-write DC */
1708 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1709 &msg, realm_dn, LDB_SCOPE_SUBTREE,
1710 krbtgt_attrs,
1711 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1712 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=%u))", (unsigned)(krbtgt_number));
1713 }
1714
1715 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1716 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1717 (unsigned)(krbtgt_number));
1718 krb5_set_error_message(context, SDB_ERR_NOENTRY,
1719 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1720 (unsigned)(krbtgt_number));
1721 return SDB_ERR_NOENTRY;
1722 } else if (lret != LDB_SUCCESS) {
1723 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1724 (unsigned)(krbtgt_number));
1725 krb5_set_error_message(context, SDB_ERR_NOENTRY,
1726 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1727 (unsigned)(krbtgt_number));
1728 return SDB_ERR_NOENTRY;
1729 }
1730
1731 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1732 principal, SAMBA_KDC_ENT_TYPE_KRBTGT,
1733 flags, realm_dn, msg, entry_ex);
1734 if (ret != 0) {
1735 krb5_warnx(context, "samba_kdc_fetch: self krbtgt message2entry failed");
1736 }
1737 return ret;
1738
1739 } else {
1740 enum trust_direction direction = UNKNOWN;
1741 const char *realm = NULL;
1742
1743 /* Either an inbound or outbound trust */
1744
1745 if (strcasecmp(lpcfg_realm(lp_ctx), realm_from_princ) == 0) {
1746 /* look for inbound trust */
1747 direction = INBOUND;
1748 realm = realm_princ_comp;
1749 } else if (principal_comp_strcasecmp(context, principal, 1, lpcfg_realm(lp_ctx)) == 0) {
1750 /* look for outbound trust */
1751 direction = OUTBOUND;
1752 realm = realm_from_princ;
1753 } else {
1754 krb5_warnx(context, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1755 realm_from_princ,
1756 realm_princ_comp);
1757 krb5_set_error_message(context, SDB_ERR_NOENTRY, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1758 realm_from_princ,
1759 realm_princ_comp);
1760 return SDB_ERR_NOENTRY;
1761 }
1762
1763 /* Trusted domains are under CN=system */
1764
1765 ret = samba_kdc_lookup_trust(context, kdc_db_ctx->samdb,
1766 mem_ctx,
1767 realm, realm_dn, &msg);
1768
1769 if (ret != 0) {
1770 krb5_warnx(context, "samba_kdc_fetch: could not find principal in DB");
1771 krb5_set_error_message(context, ret, "samba_kdc_fetch: could not find principal in DB");
1772 return ret;
1773 }
1774
1775 ret = samba_kdc_trust_message2entry(context, kdc_db_ctx, mem_ctx,
1776 principal, direction,
1777 realm_dn, flags, kvno, msg, entry_ex);
1778 if (ret != 0) {
1779 krb5_warnx(context, "samba_kdc_fetch: trust_message2entry failed for %s",
1780 ldb_dn_get_linearized(msg->dn));
1781 krb5_set_error_message(context, ret, "samba_kdc_fetch: "
1782 "trust_message2entry failed for %s",
1783 ldb_dn_get_linearized(msg->dn));
1784 }
1785 return ret;
1786 }
1787
1788 }
1789
1790 static krb5_error_code samba_kdc_lookup_server(krb5_context context,
1791 struct samba_kdc_db_context *kdc_db_ctx,
1792 TALLOC_CTX *mem_ctx,
1793 krb5_const_principal principal,
1794 unsigned flags,
1795 const char **attrs,
1796 struct ldb_dn **realm_dn,
1797 struct ldb_message **msg)
1798 {
1799 krb5_error_code ret;
1800 if ((smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL)
1801 && krb5_princ_size(context, principal) >= 2) {
1802 /* 'normal server' case */
1803 int ldb_ret;
1804 NTSTATUS nt_status;
1805 struct ldb_dn *user_dn;
1806 char *principal_string;
1807
1808 ret = krb5_unparse_name_flags(context, principal,
1809 KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1810 &principal_string);
1811 if (ret != 0) {
1812 return ret;
1813 }
1814
1815 /* At this point we may find the host is known to be
1816 * in a different realm, so we should generate a
1817 * referral instead */
1818 nt_status = crack_service_principal_name(kdc_db_ctx->samdb,
1819 mem_ctx, principal_string,
1820 &user_dn, realm_dn);
1821 free(principal_string);
1822
1823 if (!NT_STATUS_IS_OK(nt_status)) {
1824 return SDB_ERR_NOENTRY;
1825 }
1826
1827 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb,
1828 mem_ctx,
1829 msg, user_dn, LDB_SCOPE_BASE,
1830 attrs,
1831 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1832 "(objectClass=*)");
1833 if (ldb_ret != LDB_SUCCESS) {
1834 return SDB_ERR_NOENTRY;
1835 }
1836 return 0;
1837 } else if (!(flags & SDB_F_FOR_AS_REQ)
1838 && smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1839 /*
1840 * The behaviour of accepting an
1841 * KRB5_NT_ENTERPRISE_PRINCIPAL server principal
1842 * containing a UPN only applies to TGS-REQ packets,
1843 * not AS-REQ packets.
1844 */
1845 return samba_kdc_lookup_client(context, kdc_db_ctx,
1846 mem_ctx, principal, attrs,
1847 realm_dn, msg);
1848 } else {
1849 /*
1850 * This case is for:
1851 * - the AS-REQ, where we only accept
1852 * samAccountName based lookups for the server, no
1853 * matter if the name is an
1854 * KRB5_NT_ENTERPRISE_PRINCIPAL or not
1855 * - for the TGS-REQ when we are not given an
1856 * KRB5_NT_ENTERPRISE_PRINCIPAL, which also must
1857 * only lookup samAccountName based names.
1858 */
1859 int lret;
1860 char *short_princ;
1861 krb5_principal enterprise_principal = NULL;
1862 krb5_const_principal used_principal = NULL;
1863 char *name1 = NULL;
1864 size_t len1 = 0;
1865 char *filter = NULL;
1866
1867 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1868 char *str = NULL;
1869 /* Need to reparse the enterprise principal to find the real target */
1870 if (krb5_princ_size(context, principal) != 1) {
1871 ret = KRB5_PARSE_MALFORMED;
1872 krb5_set_error_message(context, ret, "samba_kdc_lookup_server: request for an "
1873 "enterprise principal with wrong (%d) number of components",
1874 krb5_princ_size(context, principal));
1875 return ret;
1876 }
1877 str = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 0);
1878 if (str == NULL) {
1879 return KRB5_PARSE_MALFORMED;
1880 }
1881 ret = krb5_parse_name(context, str,
1882 &enterprise_principal);
1883 talloc_free(str);
1884 if (ret) {
1885 return ret;
1886 }
1887 used_principal = enterprise_principal;
1888 } else {
1889 used_principal = principal;
1890 }
1891
1892 /* server as client principal case, but we must not lookup userPrincipalNames */
1893 *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1894
1895 /* TODO: Check if it is our realm, otherwise give referral */
1896
1897 ret = krb5_unparse_name_flags(context, used_principal,
1898 KRB5_PRINCIPAL_UNPARSE_NO_REALM |
1899 KRB5_PRINCIPAL_UNPARSE_DISPLAY,
1900 &short_princ);
1901 used_principal = NULL;
1902 krb5_free_principal(context, enterprise_principal);
1903 enterprise_principal = NULL;
1904
1905 if (ret != 0) {
1906 krb5_set_error_message(context, ret, "samba_kdc_lookup_principal: could not parse principal");
1907 krb5_warnx(context, "samba_kdc_lookup_principal: could not parse principal");
1908 return ret;
1909 }
1910
1911 name1 = ldb_binary_encode_string(mem_ctx, short_princ);
1912 SAFE_FREE(short_princ);
1913 if (name1 == NULL) {
1914 return ENOMEM;
1915 }
1916 len1 = strlen(name1);
1917 if (len1 >= 1 && name1[len1 - 1] != '$') {
1918 filter = talloc_asprintf(mem_ctx,
1919 "(&(objectClass=user)(|(samAccountName=%s)(samAccountName=%s$)))",
1920 name1, name1);
1921 if (filter == NULL) {
1922 return ENOMEM;
1923 }
1924 } else {
1925 filter = talloc_asprintf(mem_ctx,
1926 "(&(objectClass=user)(samAccountName=%s))",
1927 name1);
1928 if (filter == NULL) {
1929 return ENOMEM;
1930 }
1931 }
1932
1933 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx, msg,
1934 *realm_dn, LDB_SCOPE_SUBTREE,
1935 attrs,
1936 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1937 "%s", filter);
1938 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1939 DEBUG(10, ("Failed to find an entry for %s filter:%s\n",
1940 name1, filter));
1941 return SDB_ERR_NOENTRY;
1942 }
1943 if (lret == LDB_ERR_CONSTRAINT_VIOLATION) {
1944 DEBUG(10, ("Failed to find unique entry for %s filter:%s\n",
1945 name1, filter));
1946 return SDB_ERR_NOENTRY;
1947 }
1948 if (lret != LDB_SUCCESS) {
1949 DEBUG(0, ("Failed single search for %s - %s\n",
1950 name1, ldb_errstring(kdc_db_ctx->samdb)));
1951 return SDB_ERR_NOENTRY;
1952 }
1953 return 0;
1954 }
1955 return SDB_ERR_NOENTRY;
1956 }
1957
1958
1959
1960 static krb5_error_code samba_kdc_fetch_server(krb5_context context,
1961 struct samba_kdc_db_context *kdc_db_ctx,
1962 TALLOC_CTX *mem_ctx,
1963 krb5_const_principal principal,
1964 unsigned flags,
1965 struct sdb_entry_ex *entry_ex)
1966 {
1967 krb5_error_code ret;
1968 struct ldb_dn *realm_dn;
1969 struct ldb_message *msg;
1970
1971 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, principal,
1972 flags, server_attrs, &realm_dn, &msg);
1973 if (ret != 0) {
1974 return ret;
1975 }
1976
1977 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1978 principal, SAMBA_KDC_ENT_TYPE_SERVER,
1979 flags,
1980 realm_dn, msg, entry_ex);
1981 if (ret != 0) {
1982 krb5_warnx(context, "samba_kdc_fetch: message2entry failed");
1983 }
1984
1985 return ret;
1986 }
1987
1988 static krb5_error_code samba_kdc_lookup_realm(krb5_context context,
1989 struct samba_kdc_db_context *kdc_db_ctx,
1990 TALLOC_CTX *mem_ctx,
1991 krb5_const_principal principal,
1992 unsigned flags,
1993 struct sdb_entry_ex *entry_ex)
1994 {
1995 TALLOC_CTX *frame = talloc_stackframe();
1996 NTSTATUS status;
1997 krb5_error_code ret;
1998 char *_realm = NULL;
1999 bool check_realm = false;
2000 const char *realm = NULL;
2001 struct dsdb_trust_routing_table *trt = NULL;
2002 const struct lsa_TrustDomainInfoInfoEx *tdo = NULL;
2003 unsigned int num_comp;
2004 bool ok;
2005 char *upper = NULL;
2006
2007 num_comp = krb5_princ_size(context, principal);
2008
2009 if (flags & SDB_F_GET_CLIENT) {
2010 if (flags & SDB_F_FOR_AS_REQ) {
2011 check_realm = true;
2012 }
2013 }
2014 if (flags & SDB_F_GET_SERVER) {
2015 if (flags & SDB_F_FOR_TGS_REQ) {
2016 check_realm = true;
2017 }
2018 }
2019
2020 if (!check_realm) {
2021 TALLOC_FREE(frame);
2022 return 0;
2023 }
2024
2025 _realm = smb_krb5_principal_get_realm(context, principal);
2026 if (_realm == NULL) {
2027 TALLOC_FREE(frame);
2028 return ENOMEM;
2029 }
2030
2031 /*
2032 * The requested realm needs to be our own
2033 */
2034 ok = lpcfg_is_my_domain_or_realm(kdc_db_ctx->lp_ctx, _realm);
2035 if (!ok) {
2036 /*
2037 * The request is not for us...
2038 */
2039 SAFE_FREE(_realm);
2040 TALLOC_FREE(frame);
2041 return SDB_ERR_NOENTRY;
2042 }
2043
2044 realm = talloc_strdup(frame, _realm);
2045 SAFE_FREE(_realm);
2046 if (realm == NULL) {
2047 TALLOC_FREE(frame);
2048 return ENOMEM;
2049 }
2050
2051 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
2052 char *principal_string = NULL;
2053 krb5_principal enterprise_principal = NULL;
2054 char *enterprise_realm = NULL;
2055
2056 if (num_comp != 1) {
2057 TALLOC_FREE(frame);
2058 return SDB_ERR_NOENTRY;
2059 }
2060
2061 principal_string = smb_krb5_principal_get_comp_string(frame, context,
2062 principal, 0);
2063 if (principal_string == NULL) {
2064 TALLOC_FREE(frame);
2065 return ENOMEM;
2066 }
2067
2068 ret = krb5_parse_name(context, principal_string,
2069 &enterprise_principal);
2070 TALLOC_FREE(principal_string);
2071 if (ret) {
2072 TALLOC_FREE(frame);
2073 return ret;
2074 }
2075
2076 enterprise_realm = smb_krb5_principal_get_realm(context,
2077 enterprise_principal);
2078 krb5_free_principal(context, enterprise_principal);
2079 if (enterprise_realm != NULL) {
2080 realm = talloc_strdup(frame, enterprise_realm);
2081 SAFE_FREE(enterprise_realm);
2082 if (realm == NULL) {
2083 TALLOC_FREE(frame);
2084 return ENOMEM;
2085 }
2086 }
2087 }
2088
2089 if (flags & SDB_F_GET_SERVER) {
2090 char *service_realm = NULL;
2091
2092 ret = principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME);
2093 if (ret == 0) {
2094 /*
2095 * we need to search krbtgt/ locally
2096 */
2097 TALLOC_FREE(frame);
2098 return 0;
2099 }
2100
2101 /*
2102 * We need to check the last component against the routing table.
2103 *
2104 * Note this works only with 2 or 3 component principals, e.g:
2105 *
2106 * servicePrincipalName: ldap/W2K8R2-219.bla.base
2107 * servicePrincipalName: ldap/W2K8R2-219.bla.base/bla.base
2108 * servicePrincipalName: ldap/W2K8R2-219.bla.base/ForestDnsZones.bla.base
2109 * servicePrincipalName: ldap/W2K8R2-219.bla.base/DomainDnsZones.bla.base
2110 */
2111
2112 if (num_comp == 2 || num_comp == 3) {
2113 service_realm = smb_krb5_principal_get_comp_string(frame,
2114 context,
2115 principal,
2116 num_comp - 1);
2117 }
2118
2119 if (service_realm != NULL) {
2120 realm = service_realm;
2121 }
2122 }
2123
2124 ok = lpcfg_is_my_domain_or_realm(kdc_db_ctx->lp_ctx, realm);
2125 if (ok) {
2126 /*
2127 * skip the expensive routing lookup
2128 */
2129 TALLOC_FREE(frame);
2130 return 0;
2131 }
2132
2133 status = dsdb_trust_routing_table_load(kdc_db_ctx->samdb,
2134 frame, &trt);
2135 if (!NT_STATUS_IS_OK(status)) {
2136 TALLOC_FREE(frame);
2137 return EINVAL;
2138 }
2139
2140 tdo = dsdb_trust_routing_by_name(trt, realm);
2141 if (tdo == NULL) {
2142 /*
2143 * This principal has to be local
2144 */
2145 TALLOC_FREE(frame);
2146 return 0;
2147 }
2148
2149 if (tdo->trust_attributes & LSA_TRUST_ATTRIBUTE_WITHIN_FOREST) {
2150 /*
2151 * TODO: handle the routing within the forest
2152 *
2153 * This should likely be handled in
2154 * samba_kdc_message2entry() in case we're
2155 * a global catalog. We'd need to check
2156 * if realm_dn is our own domain and derive
2157 * the dns domain name from realm_dn and check that
2158 * against the routing table or fallback to
2159 * the tdo we found here.
2160 *
2161 * But for now we don't support multiple domains
2162 * in our forest correctly anyway.
2163 *
2164 * Just search in our local database.
2165 */
2166 TALLOC_FREE(frame);
2167 return 0;
2168 }
2169
2170 ZERO_STRUCT(entry_ex->entry);
2171
2172 ret = krb5_copy_principal(context, principal,
2173 &entry_ex->entry.principal);
2174 if (ret) {
2175 TALLOC_FREE(frame);
2176 return ret;
2177 }
2178
2179 upper = strupper_talloc(frame, tdo->domain_name.string);
2180 if (upper == NULL) {
2181 TALLOC_FREE(frame);
2182 return ENOMEM;
2183 }
2184
2185 ret = smb_krb5_principal_set_realm(context,
2186 entry_ex->entry.principal,
2187 upper);
2188 if (ret) {
2189 TALLOC_FREE(frame);
2190 return ret;
2191 }
2192
2193 TALLOC_FREE(frame);
2194 return SDB_ERR_WRONG_REALM;
2195 }
2196
2197 krb5_error_code samba_kdc_fetch(krb5_context context,
2198 struct samba_kdc_db_context *kdc_db_ctx,
2199 krb5_const_principal principal,
2200 unsigned flags,
2201 krb5_kvno kvno,
2202 struct sdb_entry_ex *entry_ex)
2203 {
2204 krb5_error_code ret = SDB_ERR_NOENTRY;
2205 TALLOC_CTX *mem_ctx;
2206
2207 mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_fetch context");
2208 if (!mem_ctx) {
2209 ret = ENOMEM;
2210 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2211 return ret;
2212 }
2213
2214 ret = samba_kdc_lookup_realm(context, kdc_db_ctx, mem_ctx,
2215 principal, flags, entry_ex);
2216 if (ret != 0) {
2217 goto done;
2218 }
2219
2220 ret = SDB_ERR_NOENTRY;
2221
2222 if (flags & SDB_F_GET_CLIENT) {
2223 ret = samba_kdc_fetch_client(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
2224 if (ret != SDB_ERR_NOENTRY) goto done;
2225 }
2226 if (flags & SDB_F_GET_SERVER) {
2227 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
2228 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
2229 if (ret != SDB_ERR_NOENTRY) goto done;
2230
2231 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
2232 ret = samba_kdc_fetch_server(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
2233 if (ret != SDB_ERR_NOENTRY) goto done;
2234 }
2235 if (flags & SDB_F_GET_KRBTGT) {
2236 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
2237 if (ret != SDB_ERR_NOENTRY) goto done;
2238 }
2239
2240 done:
2241 talloc_free(mem_ctx);
2242 return ret;
2243 }
2244
2245 struct samba_kdc_seq {
2246 unsigned int index;
2247 unsigned int count;
2248 struct ldb_message **msgs;
2249 struct ldb_dn *realm_dn;
2250 };
2251
2252 static krb5_error_code samba_kdc_seq(krb5_context context,
2253 struct samba_kdc_db_context *kdc_db_ctx,
2254 struct sdb_entry_ex *entry)
2255 {
2256 krb5_error_code ret;
2257 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
2258 const char *realm = lpcfg_realm(kdc_db_ctx->lp_ctx);
2259 struct ldb_message *msg = NULL;
2260 const char *sAMAccountName = NULL;
2261 krb5_principal principal = NULL;
2262 TALLOC_CTX *mem_ctx;
2263
2264 if (!priv) {
2265 return SDB_ERR_NOENTRY;
2266 }
2267
2268 mem_ctx = talloc_named(priv, 0, "samba_kdc_seq context");
2269
2270 if (!mem_ctx) {
2271 ret = ENOMEM;
2272 krb5_set_error_message(context, ret, "samba_kdc_seq: talloc_named() failed!");
2273 return ret;
2274 }
2275
2276 while (priv->index < priv->count) {
2277 msg = priv->msgs[priv->index++];
2278
2279 sAMAccountName = ldb_msg_find_attr_as_string(msg, "sAMAccountName", NULL);
2280 if (sAMAccountName != NULL) {
2281 break;
2282 }
2283 }
2284
2285 if (sAMAccountName == NULL) {
2286 ret = SDB_ERR_NOENTRY;
2287 goto out;
2288 }
2289
2290 ret = smb_krb5_make_principal(context, &principal,
2291 realm, sAMAccountName, NULL);
2292 if (ret != 0) {
2293 goto out;
2294 }
2295
2296 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
2297 principal, SAMBA_KDC_ENT_TYPE_ANY,
2298 SDB_F_ADMIN_DATA|SDB_F_GET_ANY,
2299 priv->realm_dn, msg, entry);
2300
2301 out:
2302 if (principal != NULL) {
2303 krb5_free_principal(context, principal);
2304 }
2305
2306 if (ret != 0) {
2307 TALLOC_FREE(priv);
2308 kdc_db_ctx->seq_ctx = NULL;
2309 } else {
2310 talloc_free(mem_ctx);
2311 }
2312
2313 return ret;
2314 }
2315
2316 krb5_error_code samba_kdc_firstkey(krb5_context context,
2317 struct samba_kdc_db_context *kdc_db_ctx,
2318 struct sdb_entry_ex *entry)
2319 {
2320 struct ldb_context *ldb_ctx = kdc_db_ctx->samdb;
2321 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
2322 char *realm;
2323 struct ldb_result *res = NULL;
2324 krb5_error_code ret;
2325 TALLOC_CTX *mem_ctx;
2326 int lret;
2327
2328 if (priv) {
2329 TALLOC_FREE(priv);
2330 kdc_db_ctx->seq_ctx = NULL;
2331 }
2332
2333 priv = (struct samba_kdc_seq *) talloc(kdc_db_ctx, struct samba_kdc_seq);
2334 if (!priv) {
2335 ret = ENOMEM;
2336 krb5_set_error_message(context, ret, "talloc: out of memory");
2337 return ret;
2338 }
2339
2340 priv->index = 0;
2341 priv->msgs = NULL;
2342 priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
2343 priv->count = 0;
2344
2345 mem_ctx = talloc_named(priv, 0, "samba_kdc_firstkey context");
2346
2347 if (!mem_ctx) {
2348 ret = ENOMEM;
2349 krb5_set_error_message(context, ret, "samba_kdc_firstkey: talloc_named() failed!");
2350 return ret;
2351 }
2352
2353 ret = krb5_get_default_realm(context, &realm);
2354 if (ret != 0) {
2355 TALLOC_FREE(priv);
2356 return ret;
2357 }
2358 krb5_free_default_realm(context, realm);
2359
2360 lret = dsdb_search(ldb_ctx, priv, &res,
2361 priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
2362 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2363 "(objectClass=user)");
2364
2365 if (lret != LDB_SUCCESS) {
2366 TALLOC_FREE(priv);
2367 return SDB_ERR_NOENTRY;
2368 }
2369
2370 priv->count = res->count;
2371 priv->msgs = talloc_steal(priv, res->msgs);
2372 talloc_free(res);
2373
2374 kdc_db_ctx->seq_ctx = priv;
2375
2376 ret = samba_kdc_seq(context, kdc_db_ctx, entry);
2377
2378 if (ret != 0) {
2379 TALLOC_FREE(priv);
2380 kdc_db_ctx->seq_ctx = NULL;
2381 } else {
2382 talloc_free(mem_ctx);
2383 }
2384 return ret;
2385 }
2386
2387 krb5_error_code samba_kdc_nextkey(krb5_context context,
2388 struct samba_kdc_db_context *kdc_db_ctx,
2389 struct sdb_entry_ex *entry)
2390 {
2391 return samba_kdc_seq(context, kdc_db_ctx, entry);
2392 }
2393
2394 /* Check if a given entry may delegate or do s4u2self to this target principal
2395 *
2396 * This is currently a very nasty hack - allowing only delegation to itself.
2397 */
2398 krb5_error_code
2399 samba_kdc_check_s4u2self(krb5_context context,
2400 struct samba_kdc_db_context *kdc_db_ctx,
2401 struct samba_kdc_entry *skdc_entry,
2402 krb5_const_principal target_principal)
2403 {
2404 krb5_error_code ret;
2405 struct ldb_dn *realm_dn;
2406 struct ldb_message *msg;
2407 struct dom_sid *orig_sid;
2408 struct dom_sid *target_sid;
2409 const char *delegation_check_attrs[] = {
2410 "objectSid", NULL
2411 };
2412
2413 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2self");
2414
2415 if (!mem_ctx) {
2416 ret = ENOMEM;
2417 krb5_set_error_message(context, ret, "samba_kdc_check_s4u2self: talloc_named() failed!");
2418 return ret;
2419 }
2420
2421 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, target_principal,
2422 SDB_F_GET_CLIENT|SDB_F_GET_SERVER,
2423 delegation_check_attrs, &realm_dn, &msg);
2424
2425 if (ret != 0) {
2426 talloc_free(mem_ctx);
2427 return ret;
2428 }
2429
2430 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2431 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2432
2433 /* Allow delegation to the same principal, even if by a different
2434 * name. The easy and safe way to prove this is by SID
2435 * comparison */
2436 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2437 talloc_free(mem_ctx);
2438 return KRB5KDC_ERR_BADOPTION;
2439 }
2440
2441 talloc_free(mem_ctx);
2442 return ret;
2443 }
2444
2445 /* Certificates printed by a the Certificate Authority might have a
2446 * slightly different form of the user principal name to that in the
2447 * database. Allow a mismatch where they both refer to the same
2448 * SID */
2449
2450 krb5_error_code
2451 samba_kdc_check_pkinit_ms_upn_match(krb5_context context,
2452 struct samba_kdc_db_context *kdc_db_ctx,
2453 struct samba_kdc_entry *skdc_entry,
2454 krb5_const_principal certificate_principal)
2455 {
2456 krb5_error_code ret;
2457 struct ldb_dn *realm_dn;
2458 struct ldb_message *msg;
2459 struct dom_sid *orig_sid;
2460 struct dom_sid *target_sid;
2461 const char *ms_upn_check_attrs[] = {
2462 "objectSid", NULL
2463 };
2464
2465 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_pkinit_ms_upn_match");
2466
2467 if (!mem_ctx) {
2468 ret = ENOMEM;
2469 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2470 return ret;
2471 }
2472
2473 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
2474 mem_ctx, certificate_principal,
2475 ms_upn_check_attrs, &realm_dn, &msg);
2476
2477 if (ret != 0) {
2478 talloc_free(mem_ctx);
2479 return ret;
2480 }
2481
2482 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2483 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2484
2485 /* Consider these to be the same principal, even if by a different
2486 * name. The easy and safe way to prove this is by SID
2487 * comparison */
2488 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2489 talloc_free(mem_ctx);
2490 #ifdef KRB5_KDC_ERR_CLIENT_NAME_MISMATCH /* Heimdal */
2491 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
2492 #elif defined(KRB5KDC_ERR_CLIENT_NAME_MISMATCH) /* MIT */
2493 return KRB5KDC_ERR_CLIENT_NAME_MISMATCH;
2494 #endif
2495 }
2496
2497 talloc_free(mem_ctx);
2498 return ret;
2499 }
2500
2501 /*
2502 * Check if a given entry may delegate to this target principal
2503 * with S4U2Proxy.
2504 */
2505 krb5_error_code
2506 samba_kdc_check_s4u2proxy(krb5_context context,
2507 struct samba_kdc_db_context *kdc_db_ctx,
2508 struct samba_kdc_entry *skdc_entry,
2509 krb5_const_principal target_principal)
2510 {
2511 krb5_error_code ret;
2512 char *tmp = NULL;
2513 const char *client_dn = NULL;
2514 const char *target_principal_name = NULL;
2515 struct ldb_message_element *el;
2516 struct ldb_val val;
2517 unsigned int i;
2518 bool found = false;
2519
2520 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2proxy");
2521
2522 if (!mem_ctx) {
2523 ret = ENOMEM;
2524 krb5_set_error_message(context, ret,
2525 "samba_kdc_check_s4u2proxy:"
2526 " talloc_named() failed!");
2527 return ret;
2528 }
2529
2530 client_dn = ldb_dn_get_linearized(skdc_entry->msg->dn);
2531 if (!client_dn) {
2532 if (errno == 0) {
2533 errno = ENOMEM;
2534 }
2535 ret = errno;
2536 krb5_set_error_message(context, ret,
2537 "samba_kdc_check_s4u2proxy:"
2538 " ldb_dn_get_linearized() failed!");
2539 return ret;
2540 }
2541
2542 /*
2543 * The main heimdal code already checked that the target_principal
2544 * belongs to the same realm as the client.
2545 *
2546 * So we just need the principal without the realm,
2547 * as that is what is configured in the "msDS-AllowedToDelegateTo"
2548 * attribute.
2549 */
2550 ret = krb5_unparse_name_flags(context, target_principal,
2551 KRB5_PRINCIPAL_UNPARSE_NO_REALM, &tmp);
2552 if (ret) {
2553 talloc_free(mem_ctx);
2554 krb5_set_error_message(context, ret,
2555 "samba_kdc_check_s4u2proxy:"
2556 " krb5_unparse_name() failed!");
2557 return ret;
2558 }
2559 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] for target[%s]\n",
2560 client_dn, tmp));
2561
2562 target_principal_name = talloc_strdup(mem_ctx, tmp);
2563 SAFE_FREE(tmp);
2564 if (target_principal_name == NULL) {
2565 ret = ENOMEM;
2566 krb5_set_error_message(context, ret,
2567 "samba_kdc_check_s4u2proxy:"
2568 " talloc_strdup() failed!");
2569 return ret;
2570 }
2571
2572 el = ldb_msg_find_element(skdc_entry->msg, "msDS-AllowedToDelegateTo");
2573 if (el == NULL) {
2574 goto bad_option;
2575 }
2576
2577 val = data_blob_string_const(target_principal_name);
2578
2579 for (i=0; i<el->num_values; i++) {
2580 struct ldb_val *val1 = &val;
2581 struct ldb_val *val2 = &el->values[i];
2582 int cmp;
2583
2584 if (val1->length != val2->length) {
2585 continue;
2586 }
2587
2588 cmp = strncasecmp((const char *)val1->data,
2589 (const char *)val2->data,
2590 val1->length);
2591 if (cmp != 0) {
2592 continue;
2593 }
2594
2595 found = true;
2596 break;
2597 }
2598
2599 if (!found) {
2600 goto bad_option;
2601 }
2602
2603 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] allowed target[%s]\n",
2604 client_dn, tmp));
2605 talloc_free(mem_ctx);
2606 return 0;
2607
2608 bad_option:
2609 krb5_set_error_message(context, ret,
2610 "samba_kdc_check_s4u2proxy: client[%s] "
2611 "not allowed for delegation to target[%s]",
2612 client_dn,
2613 target_principal_name);
2614 talloc_free(mem_ctx);
2615 return KRB5KDC_ERR_BADOPTION;
2616 }
2617
2618 NTSTATUS samba_kdc_setup_db_ctx(TALLOC_CTX *mem_ctx, struct samba_kdc_base_context *base_ctx,
2619 struct samba_kdc_db_context **kdc_db_ctx_out)
2620 {
2621 int ldb_ret;
2622 struct ldb_message *msg;
2623 struct auth_session_info *session_info;
2624 struct samba_kdc_db_context *kdc_db_ctx;
2625 /* The idea here is very simple. Using Kerberos to
2626 * authenticate the KDC to the LDAP server is higly likely to
2627 * be circular.
2628 *
2629 * In future we may set this up to use EXERNAL and SSL
2630 * certificates, for now it will almost certainly be NTLMSSP_SET_USERNAME
2631 */
2632
2633 kdc_db_ctx = talloc_zero(mem_ctx, struct samba_kdc_db_context);
2634 if (kdc_db_ctx == NULL) {
2635 return NT_STATUS_NO_MEMORY;
2636 }
2637 kdc_db_ctx->ev_ctx = base_ctx->ev_ctx;
2638 kdc_db_ctx->lp_ctx = base_ctx->lp_ctx;
2639
2640 /* get default kdc policy */
2641 lpcfg_default_kdc_policy(base_ctx->lp_ctx,
2642 &kdc_db_ctx->policy.svc_tkt_lifetime,
2643 &kdc_db_ctx->policy.usr_tkt_lifetime,
2644 &kdc_db_ctx->policy.renewal_lifetime);
2645
2646 session_info = system_session(kdc_db_ctx->lp_ctx);
2647 if (session_info == NULL) {
2648 return NT_STATUS_INTERNAL_ERROR;
2649 }
2650
2651 /* Setup the link to LDB */
2652 kdc_db_ctx->samdb = samdb_connect(kdc_db_ctx, base_ctx->ev_ctx,
2653 base_ctx->lp_ctx, session_info, 0);
2654 if (kdc_db_ctx->samdb == NULL) {
2655 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot open samdb for KDC backend!"));
2656 talloc_free(kdc_db_ctx);
2657 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2658 }
2659
2660 /* Find out our own krbtgt kvno */
2661 ldb_ret = samdb_rodc(kdc_db_ctx->samdb, &kdc_db_ctx->rodc);
2662 if (ldb_ret != LDB_SUCCESS) {
2663 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine if we are an RODC in KDC backend: %s\n",
2664 ldb_errstring(kdc_db_ctx->samdb)));
2665 talloc_free(kdc_db_ctx);
2666 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2667 }
2668 if (kdc_db_ctx->rodc) {
2669 int my_krbtgt_number;
2670 const char *secondary_keytab[] = { "msDS-SecondaryKrbTgtNumber", NULL };
2671 struct ldb_dn *account_dn;
2672 struct ldb_dn *server_dn = samdb_server_dn(kdc_db_ctx->samdb, kdc_db_ctx);
2673 if (!server_dn) {
2674 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server DN in KDC backend: %s\n",
2675 ldb_errstring(kdc_db_ctx->samdb)));
2676 talloc_free(kdc_db_ctx);
2677 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2678 }
2679
2680 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, server_dn,
2681 "serverReference", &account_dn);
2682 if (ldb_ret != LDB_SUCCESS) {
2683 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server account in KDC backend: %s\n",
2684 ldb_errstring(kdc_db_ctx->samdb)));
2685 talloc_free(kdc_db_ctx);
2686 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2687 }
2688
2689 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, account_dn,
2690 "msDS-KrbTgtLink", &kdc_db_ctx->krbtgt_dn);
2691 talloc_free(account_dn);
2692 if (ldb_ret != LDB_SUCCESS) {
2693 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine RODC krbtgt account in KDC backend: %s\n",
2694 ldb_errstring(kdc_db_ctx->samdb)));
2695 talloc_free(kdc_db_ctx);
2696 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2697 }
2698
2699 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2700 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
2701 secondary_keytab,
2702 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2703 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=*))");
2704 if (ldb_ret != LDB_SUCCESS) {
2705 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read krbtgt account %s in KDC backend to get msDS-SecondaryKrbTgtNumber: %s: %s\n",
2706 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2707 ldb_errstring(kdc_db_ctx->samdb),
2708 ldb_strerror(ldb_ret)));
2709 talloc_free(kdc_db_ctx);
2710 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2711 }
2712 my_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
2713 if (my_krbtgt_number == -1) {
2714 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read msDS-SecondaryKrbTgtNumber from krbtgt account %s in KDC backend: got %d\n",
2715 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2716 my_krbtgt_number));
2717 talloc_free(kdc_db_ctx);
2718 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2719 }
2720 kdc_db_ctx->my_krbtgt_number = my_krbtgt_number;
2721
2722 } else {
2723 kdc_db_ctx->my_krbtgt_number = 0;
2724 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2725 &msg,
2726 ldb_get_default_basedn(kdc_db_ctx->samdb),
2727 LDB_SCOPE_SUBTREE,
2728 krbtgt_attrs,
2729 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2730 "(&(objectClass=user)(samAccountName=krbtgt))");
2731
2732 if (ldb_ret != LDB_SUCCESS) {
2733 DEBUG(1, ("samba_kdc_fetch: could not find own KRBTGT in DB: %s\n", ldb_errstring(kdc_db_ctx->samdb)));
2734 talloc_free(kdc_db_ctx);
2735 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2736 }
2737 kdc_db_ctx->krbtgt_dn = talloc_steal(kdc_db_ctx, msg->dn);
2738 kdc_db_ctx->my_krbtgt_number = 0;
2739 talloc_free(msg);
2740 }
2741 *kdc_db_ctx_out = kdc_db_ctx;
2742 return NT_STATUS_OK;
2743 }
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