?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
selftest/selftesthelpers.py: let plantestsuite() use the env name in the test name
[Samba.git] / source4 / kdc / db-glue.c
blobbf55befddf80633c1a197c262def9176e35caa3a
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 /*
200 * Sort keys in descending order of strength.
201 *
202 * Explanaton from Greg Hudson:
203 *
204 * To encrypt tickets only the first returned key is used by the MIT KDC. The
205 * other keys just communicate support for session key enctypes, and aren't
206 * really used. The encryption key for the ticket enc part doesn't have
207 * to be of a type requested by the client. The session key enctype is chosen
208 * based on the client preference order, limited by the set of enctypes present
209 * in the server keys (unless the string attribute is set on the server
210 * principal overriding that set).
211 */
212 static int samba_kdc_sort_encryption_keys(struct sdb_entry_ex *entry_ex)
213 {
214 unsigned int i, j, idx = 0;
215 static const krb5_enctype etype_list[] = {
216 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
217 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
218 ENCTYPE_DES3_CBC_SHA1,
219 ENCTYPE_ARCFOUR_HMAC,
220 ENCTYPE_DES_CBC_MD5,
221 ENCTYPE_DES_CBC_MD4,
222 ENCTYPE_DES_CBC_CRC,
223 ENCTYPE_NULL
224 };
225 size_t etype_len = ARRAY_SIZE(etype_list);
226 size_t keys_size = entry_ex->entry.keys.len;
227 struct sdb_key *keys = entry_ex->entry.keys.val;
228 struct sdb_key *sorted_keys;
229
230 sorted_keys = calloc(keys_size, sizeof(struct sdb_key));
231 if (sorted_keys == NULL) {
232 return -1;
233 }
234
235 for (i = 0; i < etype_len; i++) {
236 for (j = 0; j < keys_size; j++) {
237 const struct sdb_key skey = keys[j];
238
239 if (idx == keys_size) {
240 break;
241 }
242
243 if (KRB5_KEY_TYPE(&skey.key) == etype_list[i]) {
244 sorted_keys[idx] = skey;
245 idx++;
246 }
247 }
248 }
249
250 /* Paranoia: Something went wrong during data copy */
251 if (idx != keys_size) {
252 free(sorted_keys);
253 return -1;
254 }
255
256 free(entry_ex->entry.keys.val);
257 entry_ex->entry.keys.val = sorted_keys;
258
259 return 0;
260 }
261
262 static krb5_error_code samba_kdc_message2entry_keys(krb5_context context,
263 struct samba_kdc_db_context *kdc_db_ctx,
264 TALLOC_CTX *mem_ctx,
265 struct ldb_message *msg,
266 uint32_t rid,
267 bool is_rodc,
268 uint32_t userAccountControl,
269 enum samba_kdc_ent_type ent_type,
270 struct sdb_entry_ex *entry_ex)
271 {
272 krb5_error_code ret = 0;
273 enum ndr_err_code ndr_err;
274 struct samr_Password *hash;
275 const struct ldb_val *sc_val;
276 struct supplementalCredentialsBlob scb;
277 struct supplementalCredentialsPackage *scpk = NULL;
278 bool newer_keys = false;
279 struct package_PrimaryKerberosBlob _pkb;
280 struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
281 struct package_PrimaryKerberosCtr4 *pkb4 = NULL;
282 uint16_t i;
283 uint16_t allocated_keys = 0;
284 int rodc_krbtgt_number = 0;
285 int kvno = 0;
286 uint32_t supported_enctypes
287 = ldb_msg_find_attr_as_uint(msg,
288 "msDS-SupportedEncryptionTypes",
289 0);
290
291 if (rid == DOMAIN_RID_KRBTGT || is_rodc) {
292 /* KDCs (and KDCs on RODCs) use AES */
293 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
294 } else if (userAccountControl & (UF_PARTIAL_SECRETS_ACCOUNT|UF_SERVER_TRUST_ACCOUNT)) {
295 /* DCs and RODCs comptuer accounts use AES */
296 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
297 } else if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT ||
298 (ent_type == SAMBA_KDC_ENT_TYPE_ANY)) {
299 /* for AS-REQ the client chooses the enc types it
300 * supports, and this will vary between computers a
301 * user logs in from.
302 *
303 * likewise for 'any' return as much as is supported,
304 * to export into a keytab */
305 supported_enctypes = ENC_ALL_TYPES;
306 }
307
308 /* If UF_USE_DES_KEY_ONLY has been set, then don't allow use of the newer enc types */
309 if (userAccountControl & UF_USE_DES_KEY_ONLY) {
310 supported_enctypes = ENC_CRC32|ENC_RSA_MD5;
311 } else {
312 /* Otherwise, add in the default enc types */
313 supported_enctypes |= ENC_CRC32 | ENC_RSA_MD5 | ENC_RC4_HMAC_MD5;
314 }
315
316 /* Is this the krbtgt or a RODC krbtgt */
317 if (is_rodc) {
318 rodc_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
319
320 if (rodc_krbtgt_number == -1) {
321 return EINVAL;
322 }
323 }
324
325 entry_ex->entry.keys.val = NULL;
326 entry_ex->entry.keys.len = 0;
327 entry_ex->entry.kvno = 0;
328
329 if ((ent_type == SAMBA_KDC_ENT_TYPE_CLIENT)
330 && (userAccountControl & UF_SMARTCARD_REQUIRED)) {
331 uint8_t secretbuffer[32];
332
333 /*
334 * Fake keys until we have a better way to reject
335 * non-pkinit requests.
336 *
337 * We just need to indicate which encryption types are
338 * supported.
339 */
340 generate_secret_buffer(secretbuffer, sizeof(secretbuffer));
341
342 allocated_keys = 3;
343 entry_ex->entry.keys.len = 0;
344 entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(struct sdb_key));
345 if (entry_ex->entry.keys.val == NULL) {
346 ZERO_STRUCT(secretbuffer);
347 ret = ENOMEM;
348 goto out;
349 }
350
351 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
352 struct sdb_key key = {};
353
354 ret = smb_krb5_keyblock_init_contents(context,
355 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
356 secretbuffer, 32,
357 &key.key);
358 if (ret) {
359 ZERO_STRUCT(secretbuffer);
360 goto out;
361 }
362
363 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
364 entry_ex->entry.keys.len++;
365 }
366
367 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
368 struct sdb_key key = {};
369
370 ret = smb_krb5_keyblock_init_contents(context,
371 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
372 secretbuffer, 16,
373 &key.key);
374 if (ret) {
375 ZERO_STRUCT(secretbuffer);
376 goto out;
377 }
378
379 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
380 entry_ex->entry.keys.len++;
381 }
382
383 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
384 struct sdb_key key = {};
385
386 ret = smb_krb5_keyblock_init_contents(context,
387 ENCTYPE_ARCFOUR_HMAC,
388 secretbuffer, 16,
389 &key.key);
390 if (ret) {
391 ZERO_STRUCT(secretbuffer);
392 goto out;
393 }
394
395 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
396 entry_ex->entry.keys.len++;
397 }
398
399 ret = 0;
400 goto out;
401 }
402
403 kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
404 if (is_rodc) {
405 kvno = SAMBA_KVNO_AND_KRBTGT(kvno, rodc_krbtgt_number);
406 }
407 entry_ex->entry.kvno = kvno;
408
409 /* Get keys from the db */
410
411 hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
412 sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
413
414 /* unicodePwd for enctype 0x17 (23) if present */
415 if (hash) {
416 allocated_keys++;
417 }
418
419 /* supplementalCredentials if present */
420 if (sc_val) {
421 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, &scb,
422 (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
423 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
424 dump_data(0, sc_val->data, sc_val->length);
425 ret = EINVAL;
426 goto out;
427 }
428
429 if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) {
430 if (scb.sub.num_packages != 0) {
431 NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
432 ret = EINVAL;
433 goto out;
434 }
435 }
436
437 for (i=0; i < scb.sub.num_packages; i++) {
438 if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) {
439 scpk = &scb.sub.packages[i];
440 if (!scpk->data || !scpk->data[0]) {
441 scpk = NULL;
442 continue;
443 }
444 newer_keys = true;
445 break;
446 } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) {
447 scpk = &scb.sub.packages[i];
448 if (!scpk->data || !scpk->data[0]) {
449 scpk = NULL;
450 }
451 /*
452 * we don't break here in hope to find
453 * a Kerberos-Newer-Keys package
454 */
455 }
456 }
457 }
458 /*
459 * Primary:Kerberos-Newer-Keys or Primary:Kerberos element
460 * of supplementalCredentials
461 */
462 if (scpk) {
463 DATA_BLOB blob;
464
465 blob = strhex_to_data_blob(mem_ctx, scpk->data);
466 if (!blob.data) {
467 ret = ENOMEM;
468 goto out;
469 }
470
471 /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */
472 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &_pkb,
473 (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
474 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
475 ret = EINVAL;
476 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
477 krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
478 goto out;
479 }
480
481 if (newer_keys && _pkb.version != 4) {
482 ret = EINVAL;
483 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
484 krb5_warnx(context, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
485 goto out;
486 }
487
488 if (!newer_keys && _pkb.version != 3) {
489 ret = EINVAL;
490 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
491 krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
492 goto out;
493 }
494
495 if (_pkb.version == 4) {
496 pkb4 = &_pkb.ctr.ctr4;
497 allocated_keys += pkb4->num_keys;
498 } else if (_pkb.version == 3) {
499 pkb3 = &_pkb.ctr.ctr3;
500 allocated_keys += pkb3->num_keys;
501 }
502 }
503
504 if (allocated_keys == 0) {
505 if (kdc_db_ctx->rodc) {
506 /* We are on an RODC, but don't have keys for this account. Signal this to the caller */
507 /* TODO: We need to call a generalised version of auth_sam_trigger_repl_secret from here */
508 return SDB_ERR_NOT_FOUND_HERE;
509 }
510
511 /* oh, no password. Apparently (comment in
512 * hdb-ldap.c) this violates the ASN.1, but this
513 * allows an entry with no keys (yet). */
514 return 0;
515 }
516
517 /* allocate space to decode into */
518 entry_ex->entry.keys.len = 0;
519 entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(struct sdb_key));
520 if (entry_ex->entry.keys.val == NULL) {
521 ret = ENOMEM;
522 goto out;
523 }
524
525 if (hash && (supported_enctypes & ENC_RC4_HMAC_MD5)) {
526 struct sdb_key key = {};
527
528 ret = smb_krb5_keyblock_init_contents(context,
529 ENCTYPE_ARCFOUR_HMAC,
530 hash->hash,
531 sizeof(hash->hash),
532 &key.key);
533 if (ret) {
534 goto out;
535 }
536
537 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
538 entry_ex->entry.keys.len++;
539 }
540
541 if (pkb4) {
542 for (i=0; i < pkb4->num_keys; i++) {
543 struct sdb_key key = {};
544
545 if (!pkb4->keys[i].value) continue;
546
547 if (!(kerberos_enctype_to_bitmap(pkb4->keys[i].keytype) & supported_enctypes)) {
548 continue;
549 }
550
551 if (pkb4->salt.string) {
552 DATA_BLOB salt;
553
554 salt = data_blob_string_const(pkb4->salt.string);
555
556 key.salt = calloc(1, sizeof(*key.salt));
557 if (key.salt == NULL) {
558 ret = ENOMEM;
559 goto out;
560 }
561
562 key.salt->type = KRB5_PW_SALT;
563
564 ret = smb_krb5_copy_data_contents(&key.salt->salt,
565 salt.data,
566 salt.length);
567 if (ret) {
568 free(key.salt);
569 key.salt = NULL;
570 goto out;
571 }
572 }
573
574 /* TODO: maybe pass the iteration_count somehow... */
575
576 ret = smb_krb5_keyblock_init_contents(context,
577 pkb4->keys[i].keytype,
578 pkb4->keys[i].value->data,
579 pkb4->keys[i].value->length,
580 &key.key);
581 if (ret == KRB5_PROG_ETYPE_NOSUPP) {
582 DEBUG(2,("Unsupported keytype ignored - type %u\n",
583 pkb4->keys[i].keytype));
584 ret = 0;
585 continue;
586 }
587 if (ret) {
588 if (key.salt) {
589 smb_krb5_free_data_contents(context, &key.salt->salt);
590 free(key.salt);
591 key.salt = NULL;
592 }
593 goto out;
594 }
595
596 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
597 entry_ex->entry.keys.len++;
598 }
599 } else if (pkb3) {
600 for (i=0; i < pkb3->num_keys; i++) {
601 struct sdb_key key = {};
602
603 if (!pkb3->keys[i].value) continue;
604
605 if (!(kerberos_enctype_to_bitmap(pkb3->keys[i].keytype) & supported_enctypes)) {
606 continue;
607 }
608
609 if (pkb3->salt.string) {
610 DATA_BLOB salt;
611
612 salt = data_blob_string_const(pkb3->salt.string);
613
614 key.salt = calloc(1, sizeof(*key.salt));
615 if (key.salt == NULL) {
616 ret = ENOMEM;
617 goto out;
618 }
619
620 key.salt->type = KRB5_PW_SALT;
621
622 ret = smb_krb5_copy_data_contents(&key.salt->salt,
623 salt.data,
624 salt.length);
625 if (ret) {
626 free(key.salt);
627 key.salt = NULL;
628 goto out;
629 }
630 }
631
632 ret = smb_krb5_keyblock_init_contents(context,
633 pkb3->keys[i].keytype,
634 pkb3->keys[i].value->data,
635 pkb3->keys[i].value->length,
636 &key.key);
637 if (ret) {
638 if (key.salt) {
639 smb_krb5_free_data_contents(context, &key.salt->salt);
640 free(key.salt);
641 key.salt = NULL;
642 }
643 goto out;
644 }
645
646 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
647 entry_ex->entry.keys.len++;
648 }
649 }
650
651 out:
652 if (ret != 0) {
653 entry_ex->entry.keys.len = 0;
654 } else if (entry_ex->entry.keys.len > 0 &&
655 entry_ex->entry.keys.val != NULL) {
656 ret = samba_kdc_sort_encryption_keys(entry_ex);
657 if (ret != 0) {
658 entry_ex->entry.keys.len = 0;
659 ret = ENOMEM;
660 }
661 }
662 if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
663 free(entry_ex->entry.keys.val);
664 entry_ex->entry.keys.val = NULL;
665 }
666 return ret;
667 }
668
669 static int principal_comp_strcmp_int(krb5_context context,
670 krb5_const_principal principal,
671 unsigned int component,
672 const char *string,
673 bool do_strcasecmp)
674 {
675 const char *p;
676 size_t len;
677
678 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
679 p = krb5_principal_get_comp_string(context, principal, component);
680 if (p == NULL) {
681 return -1;
682 }
683 len = strlen(p);
684 #else
685 krb5_data *d;
686 if (component >= krb5_princ_size(context, principal)) {
687 return -1;
688 }
689
690 d = krb5_princ_component(context, principal, component);
691 if (d == NULL) {
692 return -1;
693 }
694
695 p = d->data;
696 len = d->length;
697 #endif
698 if (do_strcasecmp) {
699 return strncasecmp(p, string, len);
700 } else {
701 return strncmp(p, string, len);
702 }
703 }
704
705 static int principal_comp_strcasecmp(krb5_context context,
706 krb5_const_principal principal,
707 unsigned int component,
708 const char *string)
709 {
710 return principal_comp_strcmp_int(context, principal,
711 component, string, true);
712 }
713
714 static int principal_comp_strcmp(krb5_context context,
715 krb5_const_principal principal,
716 unsigned int component,
717 const char *string)
718 {
719 return principal_comp_strcmp_int(context, principal,
720 component, string, false);
721 }
722
723 /*
724 * Construct an hdb_entry from a directory entry.
725 */
726 static krb5_error_code samba_kdc_message2entry(krb5_context context,
727 struct samba_kdc_db_context *kdc_db_ctx,
728 TALLOC_CTX *mem_ctx,
729 krb5_const_principal principal,
730 enum samba_kdc_ent_type ent_type,
731 unsigned flags,
732 struct ldb_dn *realm_dn,
733 struct ldb_message *msg,
734 struct sdb_entry_ex *entry_ex)
735 {
736 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
737 uint32_t userAccountControl;
738 uint32_t msDS_User_Account_Control_Computed;
739 krb5_error_code ret = 0;
740 krb5_boolean is_computer = FALSE;
741
742 struct samba_kdc_entry *p;
743 NTTIME acct_expiry;
744 NTSTATUS status;
745
746 uint32_t rid;
747 bool is_rodc = false;
748 struct ldb_message_element *objectclasses;
749 struct ldb_val computer_val;
750 const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
751 computer_val.data = discard_const_p(uint8_t,"computer");
752 computer_val.length = strlen((const char *)computer_val.data);
753
754 if (ldb_msg_find_element(msg, "msDS-SecondaryKrbTgtNumber")) {
755 is_rodc = true;
756 }
757
758 if (!samAccountName) {
759 ret = ENOENT;
760 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no samAccountName present");
761 goto out;
762 }
763
764 objectclasses = ldb_msg_find_element(msg, "objectClass");
765
766 if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
767 is_computer = TRUE;
768 }
769
770 ZERO_STRUCTP(entry_ex);
771
772 p = talloc_zero(mem_ctx, struct samba_kdc_entry);
773 if (!p) {
774 ret = ENOMEM;
775 goto out;
776 }
777
778 p->kdc_db_ctx = kdc_db_ctx;
779 p->realm_dn = talloc_reference(p, realm_dn);
780 if (!p->realm_dn) {
781 ret = ENOMEM;
782 goto out;
783 }
784
785 talloc_set_destructor(p, samba_kdc_entry_destructor);
786
787 entry_ex->ctx = p;
788
789 userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
790
791 msDS_User_Account_Control_Computed
792 = ldb_msg_find_attr_as_uint(msg,
793 "msDS-User-Account-Control-Computed",
794 UF_ACCOUNTDISABLE);
795
796 /*
797 * This brings in the lockout flag, block the account if not
798 * found. We need the weird UF_ACCOUNTDISABLE check because
799 * we do not want to fail open if the value is not returned,
800 * but 0 is a valid value (all OK)
801 */
802 if (msDS_User_Account_Control_Computed == UF_ACCOUNTDISABLE) {
803 ret = EINVAL;
804 krb5_set_error_message(context, ret, "samba_kdc_message2entry: "
805 "no msDS-User-Account-Control-Computed present");
806 goto out;
807 } else {
808 userAccountControl |= msDS_User_Account_Control_Computed;
809 }
810
811 /*
812 * If we are set to canonicalize, we get back the fixed UPPER
813 * case realm, and the real username (ie matching LDAP
814 * samAccountName)
815 *
816 * Otherwise, if we are set to enterprise, we
817 * get back the whole principal as-sent
818 *
819 * Finally, if we are not set to canonicalize, we get back the
820 * fixed UPPER case realm, but the as-sent username
821 */
822
823 if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT) {
824 if (flags & (SDB_F_CANON)) {
825 /*
826 * When requested to do so, ensure that the
827 * both realm values in the principal are set
828 * to the upper case, canonical realm
829 */
830 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal,
831 lpcfg_realm(lp_ctx), "krbtgt",
832 lpcfg_realm(lp_ctx), NULL);
833 if (ret) {
834 krb5_clear_error_message(context);
835 goto out;
836 }
837 smb_krb5_principal_set_type(context, entry_ex->entry.principal, KRB5_NT_SRV_INST);
838 } else {
839 ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
840 if (ret) {
841 krb5_clear_error_message(context);
842 goto out;
843 }
844 /*
845 * this appears to be required regardless of
846 * the canonicalize flag from the client
847 */
848 ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
849 if (ret) {
850 krb5_clear_error_message(context);
851 goto out;
852 }
853 }
854
855 } else if (ent_type == SAMBA_KDC_ENT_TYPE_ANY && principal == NULL) {
856 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
857 if (ret) {
858 krb5_clear_error_message(context);
859 goto out;
860 }
861 } else if (flags & SDB_F_CANON && flags & SDB_F_FOR_AS_REQ) {
862 /*
863 * SDB_F_CANON maps from the canonicalize flag in the
864 * packet, and has a different meaning between AS-REQ
865 * and TGS-REQ. We only change the principal in the AS-REQ case
866 */
867 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
868 if (ret) {
869 krb5_clear_error_message(context);
870 goto out;
871 }
872 } else {
873 ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
874 if (ret) {
875 krb5_clear_error_message(context);
876 goto out;
877 }
878
879 if (smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL) {
880 /* While we have copied the client principal, tests
881 * show that Win2k3 returns the 'corrected' realm, not
882 * the client-specified realm. This code attempts to
883 * replace the client principal's realm with the one
884 * we determine from our records */
885
886 /* this has to be with malloc() */
887 ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
888 if (ret) {
889 krb5_clear_error_message(context);
890 goto out;
891 }
892 }
893 }
894
895 /* First try and figure out the flags based on the userAccountControl */
896 entry_ex->entry.flags = uf2SDBFlags(context, userAccountControl, ent_type);
897
898 /* Windows 2008 seems to enforce this (very sensible) rule by
899 * default - don't allow offline attacks on a user's password
900 * by asking for a ticket to them as a service (encrypted with
901 * their probably patheticly insecure password) */
902
903 if (entry_ex->entry.flags.server
904 && lpcfg_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
905 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
906 entry_ex->entry.flags.server = 0;
907 }
908 }
909 /*
910 * To give the correct type of error to the client, we must
911 * not just return the entry without .server set, we must
912 * pretend the principal does not exist. Otherwise we may
913 * return ERR_POLICY instead of
914 * KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
915 */
916 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER && entry_ex->entry.flags.server == 0) {
917 ret = SDB_ERR_NOENTRY;
918 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no servicePrincipalName present for this server, refusing with no-such-entry");
919 goto out;
920 }
921 if (flags & SDB_F_ADMIN_DATA) {
922 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
923 * of the Heimdal KDC. They are stored in a the traditional
924 * DB for audit purposes, and still form part of the structure
925 * we must return */
926
927 /* use 'whenCreated' */
928 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
929 /* use 'kadmin' for now (needed by mit_samba) */
930
931 ret = smb_krb5_make_principal(context,
932 &entry_ex->entry.created_by.principal,
933 lpcfg_realm(lp_ctx), "kadmin", NULL);
934 if (ret) {
935 krb5_clear_error_message(context);
936 goto out;
937 }
938
939 entry_ex->entry.modified_by = (struct sdb_event *) malloc(sizeof(struct sdb_event));
940 if (entry_ex->entry.modified_by == NULL) {
941 ret = ENOMEM;
942 krb5_set_error_message(context, ret, "malloc: out of memory");
943 goto out;
944 }
945
946 /* use 'whenChanged' */
947 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
948 /* use 'kadmin' for now (needed by mit_samba) */
949 ret = smb_krb5_make_principal(context,
950 &entry_ex->entry.modified_by->principal,
951 lpcfg_realm(lp_ctx), "kadmin", NULL);
952 if (ret) {
953 krb5_clear_error_message(context);
954 goto out;
955 }
956 }
957
958
959 /* The lack of password controls etc applies to krbtgt by
960 * virtue of being that particular RID */
961 status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
962
963 if (!NT_STATUS_IS_OK(status)) {
964 ret = EINVAL;
965 goto out;
966 }
967
968 if (rid == DOMAIN_RID_KRBTGT) {
969 char *realm = NULL;
970
971 entry_ex->entry.valid_end = NULL;
972 entry_ex->entry.pw_end = NULL;
973
974 entry_ex->entry.flags.invalid = 0;
975 entry_ex->entry.flags.server = 1;
976
977 realm = smb_krb5_principal_get_realm(context, principal);
978 if (realm == NULL) {
979 ret = ENOMEM;
980 goto out;
981 }
982
983 /* Don't mark all requests for the krbtgt/realm as
984 * 'change password', as otherwise we could get into
985 * trouble, and not enforce the password expirty.
986 * Instead, only do it when request is for the kpasswd service */
987 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER
988 && krb5_princ_size(context, principal) == 2
989 && (principal_comp_strcmp(context, principal, 0, "kadmin") == 0)
990 && (principal_comp_strcmp(context, principal, 1, "changepw") == 0)
991 && lpcfg_is_my_domain_or_realm(lp_ctx, realm)) {
992 entry_ex->entry.flags.change_pw = 1;
993 }
994
995 SAFE_FREE(realm);
996
997 entry_ex->entry.flags.client = 0;
998 entry_ex->entry.flags.forwardable = 1;
999 entry_ex->entry.flags.ok_as_delegate = 1;
1000 } else if (is_rodc) {
1001 /* The RODC krbtgt account is like the main krbtgt,
1002 * but it does not have a changepw or kadmin
1003 * service */
1004
1005 entry_ex->entry.valid_end = NULL;
1006 entry_ex->entry.pw_end = NULL;
1007
1008 /* Also don't allow the RODC krbtgt to be a client (it should not be needed) */
1009 entry_ex->entry.flags.client = 0;
1010 entry_ex->entry.flags.invalid = 0;
1011 entry_ex->entry.flags.server = 1;
1012
1013 entry_ex->entry.flags.client = 0;
1014 entry_ex->entry.flags.forwardable = 1;
1015 entry_ex->entry.flags.ok_as_delegate = 0;
1016 } else if (entry_ex->entry.flags.server && ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
1017 /* The account/password expiry only applies when the account is used as a
1018 * client (ie password login), not when used as a server */
1019
1020 /* Make very well sure we don't use this for a client,
1021 * it could bypass the password restrictions */
1022 entry_ex->entry.flags.client = 0;
1023
1024 entry_ex->entry.valid_end = NULL;
1025 entry_ex->entry.pw_end = NULL;
1026
1027 } else {
1028 NTTIME must_change_time
1029 = samdb_result_nttime(msg,
1030 "msDS-UserPasswordExpiryTimeComputed",
1031 0);
1032 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
1033 entry_ex->entry.pw_end = NULL;
1034 } else {
1035 entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
1036 if (entry_ex->entry.pw_end == NULL) {
1037 ret = ENOMEM;
1038 goto out;
1039 }
1040 *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
1041 }
1042
1043 acct_expiry = samdb_result_account_expires(msg);
1044 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
1045 entry_ex->entry.valid_end = NULL;
1046 } else {
1047 entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
1048 if (entry_ex->entry.valid_end == NULL) {
1049 ret = ENOMEM;
1050 goto out;
1051 }
1052 *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
1053 }
1054 }
1055
1056 entry_ex->entry.valid_start = NULL;
1057
1058 entry_ex->entry.max_life = malloc(sizeof(*entry_ex->entry.max_life));
1059 if (entry_ex->entry.max_life == NULL) {
1060 ret = ENOMEM;
1061 goto out;
1062 }
1063
1064 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
1065 *entry_ex->entry.max_life = kdc_db_ctx->policy.svc_tkt_lifetime;
1066 } else if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT || ent_type == SAMBA_KDC_ENT_TYPE_CLIENT) {
1067 *entry_ex->entry.max_life = kdc_db_ctx->policy.usr_tkt_lifetime;
1068 } else {
1069 *entry_ex->entry.max_life = MIN(kdc_db_ctx->policy.svc_tkt_lifetime,
1070 kdc_db_ctx->policy.usr_tkt_lifetime);
1071 }
1072
1073 entry_ex->entry.max_renew = malloc(sizeof(*entry_ex->entry.max_life));
1074 if (entry_ex->entry.max_renew == NULL) {
1075 ret = ENOMEM;
1076 goto out;
1077 }
1078
1079 *entry_ex->entry.max_renew = kdc_db_ctx->policy.renewal_lifetime;
1080
1081 /* Get keys from the db */
1082 ret = samba_kdc_message2entry_keys(context, kdc_db_ctx, p, msg,
1083 rid, is_rodc, userAccountControl,
1084 ent_type, entry_ex);
1085 if (ret) {
1086 /* Could be bogus data in the entry, or out of memory */
1087 goto out;
1088 }
1089
1090 p->msg = talloc_steal(p, msg);
1091
1092 out:
1093 if (ret != 0) {
1094 /* This doesn't free ent itself, that is for the eventual caller to do */
1095 sdb_free_entry(entry_ex);
1096 ZERO_STRUCTP(entry_ex);
1097 } else {
1098 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1099 }
1100
1101 return ret;
1102 }
1103
1104 /*
1105 * Construct an hdb_entry from a directory entry.
1106 * The kvno is what the remote client asked for
1107 */
1108 static krb5_error_code samba_kdc_trust_message2entry(krb5_context context,
1109 struct samba_kdc_db_context *kdc_db_ctx,
1110 TALLOC_CTX *mem_ctx, krb5_const_principal principal,
1111 enum trust_direction direction,
1112 struct ldb_dn *realm_dn,
1113 unsigned flags,
1114 uint32_t kvno,
1115 struct ldb_message *msg,
1116 struct sdb_entry_ex *entry_ex)
1117 {
1118 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1119 const char *our_realm = lpcfg_realm(lp_ctx);
1120 const char *dnsdomain = NULL;
1121 char *partner_realm = NULL;
1122 const char *realm = NULL;
1123 const char *krbtgt_realm = NULL;
1124 DATA_BLOB password_utf16 = data_blob_null;
1125 DATA_BLOB password_utf8 = data_blob_null;
1126 struct samr_Password _password_hash;
1127 const struct samr_Password *password_hash = NULL;
1128 const struct ldb_val *password_val;
1129 struct trustAuthInOutBlob password_blob;
1130 struct samba_kdc_entry *p;
1131 bool use_previous = false;
1132 uint32_t current_kvno;
1133 uint32_t previous_kvno;
1134 uint32_t num_keys = 0;
1135 enum ndr_err_code ndr_err;
1136 int ret, trust_direction_flags;
1137 unsigned int i;
1138 struct AuthenticationInformationArray *auth_array;
1139 struct timeval tv;
1140 NTTIME an_hour_ago;
1141 uint32_t *auth_kvno;
1142 bool preferr_current = false;
1143 uint32_t supported_enctypes = ENC_RC4_HMAC_MD5;
1144
1145 if (dsdb_functional_level(kdc_db_ctx->samdb) >= DS_DOMAIN_FUNCTION_2008) {
1146 supported_enctypes = ldb_msg_find_attr_as_uint(msg,
1147 "msDS-SupportedEncryptionTypes",
1148 supported_enctypes);
1149 }
1150
1151 trust_direction_flags = ldb_msg_find_attr_as_int(msg, "trustDirection", 0);
1152 if (!(trust_direction_flags & direction)) {
1153 krb5_clear_error_message(context);
1154 ret = SDB_ERR_NOENTRY;
1155 goto out;
1156 }
1157
1158 dnsdomain = ldb_msg_find_attr_as_string(msg, "trustPartner", NULL);
1159 if (dnsdomain == NULL) {
1160 krb5_clear_error_message(context);
1161 ret = SDB_ERR_NOENTRY;
1162 goto out;
1163 }
1164 partner_realm = strupper_talloc(mem_ctx, dnsdomain);
1165 if (partner_realm == NULL) {
1166 krb5_clear_error_message(context);
1167 ret = ENOMEM;
1168 goto out;
1169 }
1170
1171 if (direction == INBOUND) {
1172 realm = our_realm;
1173 krbtgt_realm = partner_realm;
1174
1175 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
1176 } else { /* OUTBOUND */
1177 realm = partner_realm;
1178 krbtgt_realm = our_realm;
1179
1180 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
1181 }
1182
1183 if (password_val == NULL) {
1184 krb5_clear_error_message(context);
1185 ret = SDB_ERR_NOENTRY;
1186 goto out;
1187 }
1188
1189 ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, &password_blob,
1190 (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
1191 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1192 krb5_clear_error_message(context);
1193 ret = EINVAL;
1194 goto out;
1195 }
1196
1197 p = talloc(mem_ctx, struct samba_kdc_entry);
1198 if (!p) {
1199 ret = ENOMEM;
1200 goto out;
1201 }
1202
1203 p->kdc_db_ctx = kdc_db_ctx;
1204 p->realm_dn = realm_dn;
1205
1206 talloc_set_destructor(p, samba_kdc_entry_destructor);
1207
1208 /* make sure we do not have bogus data in there */
1209 memset(&entry_ex->entry, 0, sizeof(struct sdb_entry));
1210
1211 entry_ex->ctx = p;
1212
1213 /* use 'whenCreated' */
1214 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
1215 /* use 'kadmin' for now (needed by mit_samba) */
1216 ret = smb_krb5_make_principal(context,
1217 &entry_ex->entry.created_by.principal,
1218 realm, "kadmin", NULL);
1219 if (ret) {
1220 krb5_clear_error_message(context);
1221 goto out;
1222 }
1223
1224 /*
1225 * We always need to generate the canonicalized principal
1226 * with the values of our database.
1227 */
1228 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, realm,
1229 "krbtgt", krbtgt_realm, NULL);
1230 if (ret) {
1231 krb5_clear_error_message(context);
1232 goto out;
1233 }
1234 smb_krb5_principal_set_type(context, entry_ex->entry.principal,
1235 KRB5_NT_SRV_INST);
1236
1237 entry_ex->entry.valid_start = NULL;
1238
1239 /* we need to work out if we are going to use the current or
1240 * the previous password hash.
1241 * We base this on the kvno the client passes in. If the kvno
1242 * passed in is equal to the current kvno in our database then
1243 * we use the current structure. If it is the current kvno-1,
1244 * then we use the previous substrucure.
1245 */
1246
1247 /*
1248 * Windows preferrs the previous key for one hour.
1249 */
1250 tv = timeval_current();
1251 if (tv.tv_sec > 3600) {
1252 tv.tv_sec -= 3600;
1253 }
1254 an_hour_ago = timeval_to_nttime(&tv);
1255
1256 /* first work out the current kvno */
1257 current_kvno = 0;
1258 for (i=0; i < password_blob.count; i++) {
1259 struct AuthenticationInformation *a =
1260 &password_blob.current.array[i];
1261
1262 if (a->LastUpdateTime <= an_hour_ago) {
1263 preferr_current = true;
1264 }
1265
1266 if (a->AuthType == TRUST_AUTH_TYPE_VERSION) {
1267 current_kvno = a->AuthInfo.version.version;
1268 }
1269 }
1270 if (current_kvno == 0) {
1271 previous_kvno = 255;
1272 } else {
1273 previous_kvno = current_kvno - 1;
1274 }
1275 for (i=0; i < password_blob.count; i++) {
1276 struct AuthenticationInformation *a =
1277 &password_blob.previous.array[i];
1278
1279 if (a->AuthType == TRUST_AUTH_TYPE_VERSION) {
1280 previous_kvno = a->AuthInfo.version.version;
1281 }
1282 }
1283
1284 /* work out whether we will use the previous or current
1285 password */
1286 if (password_blob.previous.count == 0) {
1287 /* there is no previous password */
1288 use_previous = false;
1289 } else if (!(flags & SDB_F_KVNO_SPECIFIED)) {
1290 /*
1291 * If not specified we use the lowest kvno
1292 * for the first hour after an update.
1293 */
1294 if (preferr_current) {
1295 use_previous = false;
1296 } else if (previous_kvno < current_kvno) {
1297 use_previous = true;
1298 } else {
1299 use_previous = false;
1300 }
1301 } else if (kvno == current_kvno) {
1302 /*
1303 * Exact match ...
1304 */
1305 use_previous = false;
1306 } else if (kvno == previous_kvno) {
1307 /*
1308 * Exact match ...
1309 */
1310 use_previous = true;
1311 } else {
1312 /*
1313 * Fallback to the current one for anything else
1314 */
1315 use_previous = false;
1316 }
1317
1318 if (use_previous) {
1319 auth_array = &password_blob.previous;
1320 auth_kvno = &previous_kvno;
1321 } else {
1322 auth_array = &password_blob.current;
1323 auth_kvno = &current_kvno;
1324 }
1325
1326 /* use the kvno the client specified, if available */
1327 if (flags & SDB_F_KVNO_SPECIFIED) {
1328 entry_ex->entry.kvno = kvno;
1329 } else {
1330 entry_ex->entry.kvno = *auth_kvno;
1331 }
1332
1333 for (i=0; i < auth_array->count; i++) {
1334 if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
1335 bool ok;
1336
1337 password_utf16 = data_blob_const(auth_array->array[i].AuthInfo.clear.password,
1338 auth_array->array[i].AuthInfo.clear.size);
1339 if (password_utf16.length == 0) {
1340 break;
1341 }
1342
1343 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1344 mdfour(_password_hash.hash, password_utf16.data, password_utf16.length);
1345 if (password_hash == NULL) {
1346 num_keys += 1;
1347 }
1348 password_hash = &_password_hash;
1349 }
1350
1351 if (!(supported_enctypes & (ENC_HMAC_SHA1_96_AES128|ENC_HMAC_SHA1_96_AES256))) {
1352 break;
1353 }
1354
1355 ok = convert_string_talloc(mem_ctx,
1356 CH_UTF16MUNGED, CH_UTF8,
1357 password_utf16.data,
1358 password_utf16.length,
1359 (void *)&password_utf8.data,
1360 &password_utf8.length);
1361 if (!ok) {
1362 krb5_clear_error_message(context);
1363 ret = ENOMEM;
1364 goto out;
1365 }
1366
1367 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1368 num_keys += 1;
1369 }
1370 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1371 num_keys += 1;
1372 }
1373 break;
1374 } else if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
1375 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1376 password_hash = &auth_array->array[i].AuthInfo.nt4owf.password;
1377 num_keys += 1;
1378 }
1379 }
1380 }
1381
1382 /* Must have found a cleartext or MD4 password */
1383 if (num_keys == 0) {
1384 DEBUG(1,(__location__ ": no usable key found\n"));
1385 krb5_clear_error_message(context);
1386 ret = SDB_ERR_NOENTRY;
1387 goto out;
1388 }
1389
1390 entry_ex->entry.keys.val = calloc(num_keys, sizeof(struct sdb_key));
1391 if (entry_ex->entry.keys.val == NULL) {
1392 krb5_clear_error_message(context);
1393 ret = ENOMEM;
1394 goto out;
1395 }
1396
1397 if (password_utf8.length != 0) {
1398 struct sdb_key key = {};
1399 krb5_const_principal salt_principal = entry_ex->entry.principal;
1400 krb5_data salt;
1401 krb5_data cleartext_data;
1402
1403 cleartext_data.data = discard_const_p(char, password_utf8.data);
1404 cleartext_data.length = password_utf8.length;
1405
1406 ret = smb_krb5_get_pw_salt(context,
1407 salt_principal,
1408 &salt);
1409 if (ret != 0) {
1410 goto out;
1411 }
1412
1413 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1414 ret = smb_krb5_create_key_from_string(context,
1415 salt_principal,
1416 &salt,
1417 &cleartext_data,
1418 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
1419 &key.key);
1420 if (ret != 0) {
1421 smb_krb5_free_data_contents(context, &salt);
1422 goto out;
1423 }
1424
1425 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1426 entry_ex->entry.keys.len++;
1427 }
1428
1429 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1430 ret = smb_krb5_create_key_from_string(context,
1431 salt_principal,
1432 &salt,
1433 &cleartext_data,
1434 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
1435 &key.key);
1436 if (ret != 0) {
1437 smb_krb5_free_data_contents(context, &salt);
1438 goto out;
1439 }
1440
1441 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1442 entry_ex->entry.keys.len++;
1443 }
1444
1445 smb_krb5_free_data_contents(context, &salt);
1446 }
1447
1448 if (password_hash != NULL) {
1449 struct sdb_key key = {};
1450
1451 ret = smb_krb5_keyblock_init_contents(context,
1452 ENCTYPE_ARCFOUR_HMAC,
1453 password_hash->hash,
1454 sizeof(password_hash->hash),
1455 &key.key);
1456 if (ret != 0) {
1457 goto out;
1458 }
1459
1460 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1461 entry_ex->entry.keys.len++;
1462 }
1463
1464 entry_ex->entry.flags = int2SDBFlags(0);
1465 entry_ex->entry.flags.immutable = 1;
1466 entry_ex->entry.flags.invalid = 0;
1467 entry_ex->entry.flags.server = 1;
1468 entry_ex->entry.flags.require_preauth = 1;
1469
1470 entry_ex->entry.pw_end = NULL;
1471
1472 entry_ex->entry.max_life = NULL;
1473
1474 entry_ex->entry.max_renew = NULL;
1475
1476 ret = samba_kdc_sort_encryption_keys(entry_ex);
1477 if (ret != 0) {
1478 krb5_clear_error_message(context);
1479 ret = ENOMEM;
1480 goto out;
1481 }
1482
1483 p->msg = talloc_steal(p, msg);
1484
1485 out:
1486 TALLOC_FREE(partner_realm);
1487
1488 if (ret != 0) {
1489 /* This doesn't free ent itself, that is for the eventual caller to do */
1490 sdb_free_entry(entry_ex);
1491 } else {
1492 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1493 }
1494
1495 return ret;
1496
1497 }
1498
1499 static krb5_error_code samba_kdc_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
1500 TALLOC_CTX *mem_ctx,
1501 const char *realm,
1502 struct ldb_dn *realm_dn,
1503 struct ldb_message **pmsg)
1504 {
1505 NTSTATUS status;
1506 const char * const *attrs = trust_attrs;
1507
1508 status = dsdb_trust_search_tdo(ldb_ctx, realm, realm,
1509 attrs, mem_ctx, pmsg);
1510 if (NT_STATUS_IS_OK(status)) {
1511 return 0;
1512 } else if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1513 return SDB_ERR_NOENTRY;
1514 } else if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1515 int ret = ENOMEM;
1516 krb5_set_error_message(context, ret, "get_sam_result_trust: out of memory");
1517 return ret;
1518 } else {
1519 int ret = EINVAL;
1520 krb5_set_error_message(context, ret, "get_sam_result_trust: %s", nt_errstr(status));
1521 return ret;
1522 }
1523 }
1524
1525 static krb5_error_code samba_kdc_lookup_client(krb5_context context,
1526 struct samba_kdc_db_context *kdc_db_ctx,
1527 TALLOC_CTX *mem_ctx,
1528 krb5_const_principal principal,
1529 const char **attrs,
1530 struct ldb_dn **realm_dn,
1531 struct ldb_message **msg)
1532 {
1533 NTSTATUS nt_status;
1534 char *principal_string = NULL;
1535
1536 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1537 principal_string = smb_krb5_principal_get_comp_string(mem_ctx, context,
1538 principal, 0);
1539 if (principal_string == NULL) {
1540 return ENOMEM;
1541 }
1542 } else {
1543 char *principal_string_m = NULL;
1544 krb5_error_code ret;
1545
1546 ret = krb5_unparse_name(context, principal, &principal_string_m);
1547 if (ret != 0) {
1548 return ret;
1549 }
1550
1551 principal_string = talloc_strdup(mem_ctx, principal_string_m);
1552 SAFE_FREE(principal_string_m);
1553 if (principal_string == NULL) {
1554 return ENOMEM;
1555 }
1556 }
1557
1558 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1559 mem_ctx, principal_string, attrs,
1560 realm_dn, msg);
1561 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1562 krb5_principal fallback_principal = NULL;
1563 unsigned int num_comp;
1564 char *fallback_realm = NULL;
1565 char *fallback_account = NULL;
1566 krb5_error_code ret;
1567
1568 ret = krb5_parse_name(context, principal_string,
1569 &fallback_principal);
1570 TALLOC_FREE(principal_string);
1571 if (ret != 0) {
1572 return ret;
1573 }
1574
1575 num_comp = krb5_princ_size(context, fallback_principal);
1576 fallback_realm = smb_krb5_principal_get_realm(context,
1577 fallback_principal);
1578 if (fallback_realm == NULL) {
1579 krb5_free_principal(context, fallback_principal);
1580 return ENOMEM;
1581 }
1582
1583 if (num_comp == 1) {
1584 size_t len;
1585
1586 fallback_account = smb_krb5_principal_get_comp_string(mem_ctx,
1587 context, fallback_principal, 0);
1588 if (fallback_account == NULL) {
1589 krb5_free_principal(context, fallback_principal);
1590 SAFE_FREE(fallback_realm);
1591 return ENOMEM;
1592 }
1593
1594 len = strlen(fallback_account);
1595 if (len >= 2 && fallback_account[len - 1] == '$') {
1596 TALLOC_FREE(fallback_account);
1597 }
1598 }
1599 krb5_free_principal(context, fallback_principal);
1600 fallback_principal = NULL;
1601
1602 if (fallback_account != NULL) {
1603 char *with_dollar;
1604
1605 with_dollar = talloc_asprintf(mem_ctx, "%s$",
1606 fallback_account);
1607 if (with_dollar == NULL) {
1608 SAFE_FREE(fallback_realm);
1609 return ENOMEM;
1610 }
1611 TALLOC_FREE(fallback_account);
1612
1613 ret = smb_krb5_make_principal(context,
1614 &fallback_principal,
1615 fallback_realm,
1616 with_dollar, NULL);
1617 TALLOC_FREE(with_dollar);
1618 if (ret != 0) {
1619 SAFE_FREE(fallback_realm);
1620 return ret;
1621 }
1622 }
1623 SAFE_FREE(fallback_realm);
1624
1625 if (fallback_principal != NULL) {
1626 char *fallback_string = NULL;
1627
1628 ret = krb5_unparse_name(context,
1629 fallback_principal,
1630 &fallback_string);
1631 if (ret != 0) {
1632 krb5_free_principal(context, fallback_principal);
1633 return ret;
1634 }
1635
1636 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1637 mem_ctx,
1638 fallback_string,
1639 attrs,
1640 realm_dn, msg);
1641 SAFE_FREE(fallback_string);
1642 }
1643 krb5_free_principal(context, fallback_principal);
1644 fallback_principal = NULL;
1645 }
1646 TALLOC_FREE(principal_string);
1647
1648 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1649 return SDB_ERR_NOENTRY;
1650 } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1651 return ENOMEM;
1652 } else if (!NT_STATUS_IS_OK(nt_status)) {
1653 return EINVAL;
1654 }
1655
1656 return 0;
1657 }
1658
1659 static krb5_error_code samba_kdc_fetch_client(krb5_context context,
1660 struct samba_kdc_db_context *kdc_db_ctx,
1661 TALLOC_CTX *mem_ctx,
1662 krb5_const_principal principal,
1663 unsigned flags,
1664 struct sdb_entry_ex *entry_ex) {
1665 struct ldb_dn *realm_dn;
1666 krb5_error_code ret;
1667 struct ldb_message *msg = NULL;
1668
1669 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1670 mem_ctx, principal, user_attrs,
1671 &realm_dn, &msg);
1672 if (ret != 0) {
1673 return ret;
1674 }
1675
1676 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1677 principal, SAMBA_KDC_ENT_TYPE_CLIENT,
1678 flags,
1679 realm_dn, msg, entry_ex);
1680 return ret;
1681 }
1682
1683 static krb5_error_code samba_kdc_fetch_krbtgt(krb5_context context,
1684 struct samba_kdc_db_context *kdc_db_ctx,
1685 TALLOC_CTX *mem_ctx,
1686 krb5_const_principal principal,
1687 unsigned flags,
1688 uint32_t kvno,
1689 struct sdb_entry_ex *entry_ex)
1690 {
1691 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1692 krb5_error_code ret;
1693 struct ldb_message *msg = NULL;
1694 struct ldb_dn *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1695 char *realm_from_princ, *realm_from_princ_malloc;
1696 char *realm_princ_comp = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 1);
1697
1698 realm_from_princ_malloc = smb_krb5_principal_get_realm(context, principal);
1699 if (realm_from_princ_malloc == NULL) {
1700 /* can't happen */
1701 return SDB_ERR_NOENTRY;
1702 }
1703 realm_from_princ = talloc_strdup(mem_ctx, realm_from_princ_malloc);
1704 free(realm_from_princ_malloc);
1705 if (realm_from_princ == NULL) {
1706 return SDB_ERR_NOENTRY;
1707 }
1708
1709 if (krb5_princ_size(context, principal) != 2
1710 || (principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME) != 0)) {
1711 /* Not a krbtgt */
1712 return SDB_ERR_NOENTRY;
1713 }
1714
1715 /* krbtgt case. Either us or a trusted realm */
1716
1717 if (lpcfg_is_my_domain_or_realm(lp_ctx, realm_from_princ)
1718 && lpcfg_is_my_domain_or_realm(lp_ctx, realm_princ_comp)) {
1719 /* us, or someone quite like us */
1720 /* Cludge, cludge cludge. If the realm part of krbtgt/realm,
1721 * is in our db, then direct the caller at our primary
1722 * krbtgt */
1723
1724 int lret;
1725 unsigned int krbtgt_number;
1726 /* w2k8r2 sometimes gives us a kvno of 255 for inter-domain
1727 trust tickets. We don't yet know what this means, but we do
1728 seem to need to treat it as unspecified */
1729 if (flags & SDB_F_KVNO_SPECIFIED) {
1730 krbtgt_number = SAMBA_KVNO_GET_KRBTGT(kvno);
1731 if (kdc_db_ctx->rodc) {
1732 if (krbtgt_number != kdc_db_ctx->my_krbtgt_number) {
1733 return SDB_ERR_NOT_FOUND_HERE;
1734 }
1735 }
1736 } else {
1737 krbtgt_number = kdc_db_ctx->my_krbtgt_number;
1738 }
1739
1740 if (krbtgt_number == kdc_db_ctx->my_krbtgt_number) {
1741 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1742 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
1743 krbtgt_attrs, DSDB_SEARCH_NO_GLOBAL_CATALOG,
1744 "(objectClass=user)");
1745 } else {
1746 /* We need to look up an RODC krbtgt (perhaps
1747 * ours, if we are an RODC, perhaps another
1748 * RODC if we are a read-write DC */
1749 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1750 &msg, realm_dn, LDB_SCOPE_SUBTREE,
1751 krbtgt_attrs,
1752 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1753 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=%u))", (unsigned)(krbtgt_number));
1754 }
1755
1756 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1757 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1758 (unsigned)(krbtgt_number));
1759 krb5_set_error_message(context, SDB_ERR_NOENTRY,
1760 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1761 (unsigned)(krbtgt_number));
1762 return SDB_ERR_NOENTRY;
1763 } else if (lret != LDB_SUCCESS) {
1764 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1765 (unsigned)(krbtgt_number));
1766 krb5_set_error_message(context, SDB_ERR_NOENTRY,
1767 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1768 (unsigned)(krbtgt_number));
1769 return SDB_ERR_NOENTRY;
1770 }
1771
1772 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1773 principal, SAMBA_KDC_ENT_TYPE_KRBTGT,
1774 flags, realm_dn, msg, entry_ex);
1775 if (ret != 0) {
1776 krb5_warnx(context, "samba_kdc_fetch: self krbtgt message2entry failed");
1777 }
1778 return ret;
1779
1780 } else {
1781 enum trust_direction direction = UNKNOWN;
1782 const char *realm = NULL;
1783
1784 /* Either an inbound or outbound trust */
1785
1786 if (strcasecmp(lpcfg_realm(lp_ctx), realm_from_princ) == 0) {
1787 /* look for inbound trust */
1788 direction = INBOUND;
1789 realm = realm_princ_comp;
1790 } else if (principal_comp_strcasecmp(context, principal, 1, lpcfg_realm(lp_ctx)) == 0) {
1791 /* look for outbound trust */
1792 direction = OUTBOUND;
1793 realm = realm_from_princ;
1794 } else {
1795 krb5_warnx(context, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1796 realm_from_princ,
1797 realm_princ_comp);
1798 krb5_set_error_message(context, SDB_ERR_NOENTRY, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1799 realm_from_princ,
1800 realm_princ_comp);
1801 return SDB_ERR_NOENTRY;
1802 }
1803
1804 /* Trusted domains are under CN=system */
1805
1806 ret = samba_kdc_lookup_trust(context, kdc_db_ctx->samdb,
1807 mem_ctx,
1808 realm, realm_dn, &msg);
1809
1810 if (ret != 0) {
1811 krb5_warnx(context, "samba_kdc_fetch: could not find principal in DB");
1812 krb5_set_error_message(context, ret, "samba_kdc_fetch: could not find principal in DB");
1813 return ret;
1814 }
1815
1816 ret = samba_kdc_trust_message2entry(context, kdc_db_ctx, mem_ctx,
1817 principal, direction,
1818 realm_dn, flags, kvno, msg, entry_ex);
1819 if (ret != 0) {
1820 krb5_warnx(context, "samba_kdc_fetch: trust_message2entry failed for %s",
1821 ldb_dn_get_linearized(msg->dn));
1822 krb5_set_error_message(context, ret, "samba_kdc_fetch: "
1823 "trust_message2entry failed for %s",
1824 ldb_dn_get_linearized(msg->dn));
1825 }
1826 return ret;
1827 }
1828
1829 }
1830
1831 static krb5_error_code samba_kdc_lookup_server(krb5_context context,
1832 struct samba_kdc_db_context *kdc_db_ctx,
1833 TALLOC_CTX *mem_ctx,
1834 krb5_const_principal principal,
1835 unsigned flags,
1836 const char **attrs,
1837 struct ldb_dn **realm_dn,
1838 struct ldb_message **msg)
1839 {
1840 krb5_error_code ret;
1841 if ((smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL)
1842 && krb5_princ_size(context, principal) >= 2) {
1843 /* 'normal server' case */
1844 int ldb_ret;
1845 NTSTATUS nt_status;
1846 struct ldb_dn *user_dn;
1847 char *principal_string;
1848
1849 ret = krb5_unparse_name_flags(context, principal,
1850 KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1851 &principal_string);
1852 if (ret != 0) {
1853 return ret;
1854 }
1855
1856 /* At this point we may find the host is known to be
1857 * in a different realm, so we should generate a
1858 * referral instead */
1859 nt_status = crack_service_principal_name(kdc_db_ctx->samdb,
1860 mem_ctx, principal_string,
1861 &user_dn, realm_dn);
1862 free(principal_string);
1863
1864 if (!NT_STATUS_IS_OK(nt_status)) {
1865 return SDB_ERR_NOENTRY;
1866 }
1867
1868 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb,
1869 mem_ctx,
1870 msg, user_dn, LDB_SCOPE_BASE,
1871 attrs,
1872 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1873 "(objectClass=*)");
1874 if (ldb_ret != LDB_SUCCESS) {
1875 return SDB_ERR_NOENTRY;
1876 }
1877 return 0;
1878 } else if (!(flags & SDB_F_FOR_AS_REQ)
1879 && smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1880 /*
1881 * The behaviour of accepting an
1882 * KRB5_NT_ENTERPRISE_PRINCIPAL server principal
1883 * containing a UPN only applies to TGS-REQ packets,
1884 * not AS-REQ packets.
1885 */
1886 return samba_kdc_lookup_client(context, kdc_db_ctx,
1887 mem_ctx, principal, attrs,
1888 realm_dn, msg);
1889 } else {
1890 /*
1891 * This case is for:
1892 * - the AS-REQ, where we only accept
1893 * samAccountName based lookups for the server, no
1894 * matter if the name is an
1895 * KRB5_NT_ENTERPRISE_PRINCIPAL or not
1896 * - for the TGS-REQ when we are not given an
1897 * KRB5_NT_ENTERPRISE_PRINCIPAL, which also must
1898 * only lookup samAccountName based names.
1899 */
1900 int lret;
1901 char *short_princ;
1902 krb5_principal enterprise_principal = NULL;
1903 krb5_const_principal used_principal = NULL;
1904 char *name1 = NULL;
1905 size_t len1 = 0;
1906 char *filter = NULL;
1907
1908 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1909 char *str = NULL;
1910 /* Need to reparse the enterprise principal to find the real target */
1911 if (krb5_princ_size(context, principal) != 1) {
1912 ret = KRB5_PARSE_MALFORMED;
1913 krb5_set_error_message(context, ret, "samba_kdc_lookup_server: request for an "
1914 "enterprise principal with wrong (%d) number of components",
1915 krb5_princ_size(context, principal));
1916 return ret;
1917 }
1918 str = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 0);
1919 if (str == NULL) {
1920 return KRB5_PARSE_MALFORMED;
1921 }
1922 ret = krb5_parse_name(context, str,
1923 &enterprise_principal);
1924 talloc_free(str);
1925 if (ret) {
1926 return ret;
1927 }
1928 used_principal = enterprise_principal;
1929 } else {
1930 used_principal = principal;
1931 }
1932
1933 /* server as client principal case, but we must not lookup userPrincipalNames */
1934 *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1935
1936 /* TODO: Check if it is our realm, otherwise give referral */
1937
1938 ret = krb5_unparse_name_flags(context, used_principal,
1939 KRB5_PRINCIPAL_UNPARSE_NO_REALM |
1940 KRB5_PRINCIPAL_UNPARSE_DISPLAY,
1941 &short_princ);
1942 used_principal = NULL;
1943 krb5_free_principal(context, enterprise_principal);
1944 enterprise_principal = NULL;
1945
1946 if (ret != 0) {
1947 krb5_set_error_message(context, ret, "samba_kdc_lookup_principal: could not parse principal");
1948 krb5_warnx(context, "samba_kdc_lookup_principal: could not parse principal");
1949 return ret;
1950 }
1951
1952 name1 = ldb_binary_encode_string(mem_ctx, short_princ);
1953 SAFE_FREE(short_princ);
1954 if (name1 == NULL) {
1955 return ENOMEM;
1956 }
1957 len1 = strlen(name1);
1958 if (len1 >= 1 && name1[len1 - 1] != '$') {
1959 filter = talloc_asprintf(mem_ctx,
1960 "(&(objectClass=user)(|(samAccountName=%s)(samAccountName=%s$)))",
1961 name1, name1);
1962 if (filter == NULL) {
1963 return ENOMEM;
1964 }
1965 } else {
1966 filter = talloc_asprintf(mem_ctx,
1967 "(&(objectClass=user)(samAccountName=%s))",
1968 name1);
1969 if (filter == NULL) {
1970 return ENOMEM;
1971 }
1972 }
1973
1974 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx, msg,
1975 *realm_dn, LDB_SCOPE_SUBTREE,
1976 attrs,
1977 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1978 "%s", filter);
1979 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1980 DEBUG(10, ("Failed to find an entry for %s filter:%s\n",
1981 name1, filter));
1982 return SDB_ERR_NOENTRY;
1983 }
1984 if (lret == LDB_ERR_CONSTRAINT_VIOLATION) {
1985 DEBUG(10, ("Failed to find unique entry for %s filter:%s\n",
1986 name1, filter));
1987 return SDB_ERR_NOENTRY;
1988 }
1989 if (lret != LDB_SUCCESS) {
1990 DEBUG(0, ("Failed single search for %s - %s\n",
1991 name1, ldb_errstring(kdc_db_ctx->samdb)));
1992 return SDB_ERR_NOENTRY;
1993 }
1994 return 0;
1995 }
1996 return SDB_ERR_NOENTRY;
1997 }
1998
1999
2000
2001 static krb5_error_code samba_kdc_fetch_server(krb5_context context,
2002 struct samba_kdc_db_context *kdc_db_ctx,
2003 TALLOC_CTX *mem_ctx,
2004 krb5_const_principal principal,
2005 unsigned flags,
2006 struct sdb_entry_ex *entry_ex)
2007 {
2008 krb5_error_code ret;
2009 struct ldb_dn *realm_dn;
2010 struct ldb_message *msg;
2011
2012 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, principal,
2013 flags, server_attrs, &realm_dn, &msg);
2014 if (ret != 0) {
2015 return ret;
2016 }
2017
2018 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
2019 principal, SAMBA_KDC_ENT_TYPE_SERVER,
2020 flags,
2021 realm_dn, msg, entry_ex);
2022 if (ret != 0) {
2023 krb5_warnx(context, "samba_kdc_fetch: message2entry failed");
2024 }
2025
2026 return ret;
2027 }
2028
2029 static krb5_error_code samba_kdc_lookup_realm(krb5_context context,
2030 struct samba_kdc_db_context *kdc_db_ctx,
2031 TALLOC_CTX *mem_ctx,
2032 krb5_const_principal principal,
2033 unsigned flags,
2034 struct sdb_entry_ex *entry_ex)
2035 {
2036 TALLOC_CTX *frame = talloc_stackframe();
2037 NTSTATUS status;
2038 krb5_error_code ret;
2039 char *_realm = NULL;
2040 bool check_realm = false;
2041 const char *realm = NULL;
2042 struct dsdb_trust_routing_table *trt = NULL;
2043 const struct lsa_TrustDomainInfoInfoEx *tdo = NULL;
2044 unsigned int num_comp;
2045 bool ok;
2046 char *upper = NULL;
2047
2048 num_comp = krb5_princ_size(context, principal);
2049
2050 if (flags & SDB_F_GET_CLIENT) {
2051 if (flags & SDB_F_FOR_AS_REQ) {
2052 check_realm = true;
2053 }
2054 }
2055 if (flags & SDB_F_GET_SERVER) {
2056 if (flags & SDB_F_FOR_TGS_REQ) {
2057 check_realm = true;
2058 }
2059 }
2060
2061 if (!check_realm) {
2062 TALLOC_FREE(frame);
2063 return 0;
2064 }
2065
2066 _realm = smb_krb5_principal_get_realm(context, principal);
2067 if (_realm == NULL) {
2068 TALLOC_FREE(frame);
2069 return ENOMEM;
2070 }
2071
2072 /*
2073 * The requested realm needs to be our own
2074 */
2075 ok = lpcfg_is_my_domain_or_realm(kdc_db_ctx->lp_ctx, _realm);
2076 if (!ok) {
2077 /*
2078 * The request is not for us...
2079 */
2080 SAFE_FREE(_realm);
2081 TALLOC_FREE(frame);
2082 return SDB_ERR_NOENTRY;
2083 }
2084
2085 realm = talloc_strdup(frame, _realm);
2086 SAFE_FREE(_realm);
2087 if (realm == NULL) {
2088 TALLOC_FREE(frame);
2089 return ENOMEM;
2090 }
2091
2092 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
2093 char *principal_string = NULL;
2094 krb5_principal enterprise_principal = NULL;
2095 char *enterprise_realm = NULL;
2096
2097 if (num_comp != 1) {
2098 TALLOC_FREE(frame);
2099 return SDB_ERR_NOENTRY;
2100 }
2101
2102 principal_string = smb_krb5_principal_get_comp_string(frame, context,
2103 principal, 0);
2104 if (principal_string == NULL) {
2105 TALLOC_FREE(frame);
2106 return ENOMEM;
2107 }
2108
2109 ret = krb5_parse_name(context, principal_string,
2110 &enterprise_principal);
2111 TALLOC_FREE(principal_string);
2112 if (ret) {
2113 TALLOC_FREE(frame);
2114 return ret;
2115 }
2116
2117 enterprise_realm = smb_krb5_principal_get_realm(context,
2118 enterprise_principal);
2119 krb5_free_principal(context, enterprise_principal);
2120 if (enterprise_realm != NULL) {
2121 realm = talloc_strdup(frame, enterprise_realm);
2122 SAFE_FREE(enterprise_realm);
2123 if (realm == NULL) {
2124 TALLOC_FREE(frame);
2125 return ENOMEM;
2126 }
2127 }
2128 }
2129
2130 if (flags & SDB_F_GET_SERVER) {
2131 char *service_realm = NULL;
2132
2133 ret = principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME);
2134 if (ret == 0) {
2135 /*
2136 * we need to search krbtgt/ locally
2137 */
2138 TALLOC_FREE(frame);
2139 return 0;
2140 }
2141
2142 /*
2143 * We need to check the last component against the routing table.
2144 *
2145 * Note this works only with 2 or 3 component principals, e.g:
2146 *
2147 * servicePrincipalName: ldap/W2K8R2-219.bla.base
2148 * servicePrincipalName: ldap/W2K8R2-219.bla.base/bla.base
2149 * servicePrincipalName: ldap/W2K8R2-219.bla.base/ForestDnsZones.bla.base
2150 * servicePrincipalName: ldap/W2K8R2-219.bla.base/DomainDnsZones.bla.base
2151 */
2152
2153 if (num_comp == 2 || num_comp == 3) {
2154 service_realm = smb_krb5_principal_get_comp_string(frame,
2155 context,
2156 principal,
2157 num_comp - 1);
2158 }
2159
2160 if (service_realm != NULL) {
2161 realm = service_realm;
2162 }
2163 }
2164
2165 ok = lpcfg_is_my_domain_or_realm(kdc_db_ctx->lp_ctx, realm);
2166 if (ok) {
2167 /*
2168 * skip the expensive routing lookup
2169 */
2170 TALLOC_FREE(frame);
2171 return 0;
2172 }
2173
2174 status = dsdb_trust_routing_table_load(kdc_db_ctx->samdb,
2175 frame, &trt);
2176 if (!NT_STATUS_IS_OK(status)) {
2177 TALLOC_FREE(frame);
2178 return EINVAL;
2179 }
2180
2181 tdo = dsdb_trust_routing_by_name(trt, realm);
2182 if (tdo == NULL) {
2183 /*
2184 * This principal has to be local
2185 */
2186 TALLOC_FREE(frame);
2187 return 0;
2188 }
2189
2190 if (tdo->trust_attributes & LSA_TRUST_ATTRIBUTE_WITHIN_FOREST) {
2191 /*
2192 * TODO: handle the routing within the forest
2193 *
2194 * This should likely be handled in
2195 * samba_kdc_message2entry() in case we're
2196 * a global catalog. We'd need to check
2197 * if realm_dn is our own domain and derive
2198 * the dns domain name from realm_dn and check that
2199 * against the routing table or fallback to
2200 * the tdo we found here.
2201 *
2202 * But for now we don't support multiple domains
2203 * in our forest correctly anyway.
2204 *
2205 * Just search in our local database.
2206 */
2207 TALLOC_FREE(frame);
2208 return 0;
2209 }
2210
2211 ZERO_STRUCT(entry_ex->entry);
2212
2213 ret = krb5_copy_principal(context, principal,
2214 &entry_ex->entry.principal);
2215 if (ret) {
2216 TALLOC_FREE(frame);
2217 return ret;
2218 }
2219
2220 upper = strupper_talloc(frame, tdo->domain_name.string);
2221 if (upper == NULL) {
2222 TALLOC_FREE(frame);
2223 return ENOMEM;
2224 }
2225
2226 ret = smb_krb5_principal_set_realm(context,
2227 entry_ex->entry.principal,
2228 upper);
2229 if (ret) {
2230 TALLOC_FREE(frame);
2231 return ret;
2232 }
2233
2234 TALLOC_FREE(frame);
2235 return SDB_ERR_WRONG_REALM;
2236 }
2237
2238 krb5_error_code samba_kdc_fetch(krb5_context context,
2239 struct samba_kdc_db_context *kdc_db_ctx,
2240 krb5_const_principal principal,
2241 unsigned flags,
2242 krb5_kvno kvno,
2243 struct sdb_entry_ex *entry_ex)
2244 {
2245 krb5_error_code ret = SDB_ERR_NOENTRY;
2246 TALLOC_CTX *mem_ctx;
2247
2248 mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_fetch context");
2249 if (!mem_ctx) {
2250 ret = ENOMEM;
2251 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2252 return ret;
2253 }
2254
2255 ret = samba_kdc_lookup_realm(context, kdc_db_ctx, mem_ctx,
2256 principal, flags, entry_ex);
2257 if (ret != 0) {
2258 goto done;
2259 }
2260
2261 ret = SDB_ERR_NOENTRY;
2262
2263 if (flags & SDB_F_GET_CLIENT) {
2264 ret = samba_kdc_fetch_client(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
2265 if (ret != SDB_ERR_NOENTRY) goto done;
2266 }
2267 if (flags & SDB_F_GET_SERVER) {
2268 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
2269 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
2270 if (ret != SDB_ERR_NOENTRY) goto done;
2271
2272 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
2273 ret = samba_kdc_fetch_server(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
2274 if (ret != SDB_ERR_NOENTRY) goto done;
2275 }
2276 if (flags & SDB_F_GET_KRBTGT) {
2277 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
2278 if (ret != SDB_ERR_NOENTRY) goto done;
2279 }
2280
2281 done:
2282 talloc_free(mem_ctx);
2283 return ret;
2284 }
2285
2286 struct samba_kdc_seq {
2287 unsigned int index;
2288 unsigned int count;
2289 struct ldb_message **msgs;
2290 struct ldb_dn *realm_dn;
2291 };
2292
2293 static krb5_error_code samba_kdc_seq(krb5_context context,
2294 struct samba_kdc_db_context *kdc_db_ctx,
2295 struct sdb_entry_ex *entry)
2296 {
2297 krb5_error_code ret;
2298 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
2299 const char *realm = lpcfg_realm(kdc_db_ctx->lp_ctx);
2300 struct ldb_message *msg = NULL;
2301 const char *sAMAccountName = NULL;
2302 krb5_principal principal = NULL;
2303 TALLOC_CTX *mem_ctx;
2304
2305 if (!priv) {
2306 return SDB_ERR_NOENTRY;
2307 }
2308
2309 mem_ctx = talloc_named(priv, 0, "samba_kdc_seq context");
2310
2311 if (!mem_ctx) {
2312 ret = ENOMEM;
2313 krb5_set_error_message(context, ret, "samba_kdc_seq: talloc_named() failed!");
2314 return ret;
2315 }
2316
2317 while (priv->index < priv->count) {
2318 msg = priv->msgs[priv->index++];
2319
2320 sAMAccountName = ldb_msg_find_attr_as_string(msg, "sAMAccountName", NULL);
2321 if (sAMAccountName != NULL) {
2322 break;
2323 }
2324 }
2325
2326 if (sAMAccountName == NULL) {
2327 ret = SDB_ERR_NOENTRY;
2328 goto out;
2329 }
2330
2331 ret = smb_krb5_make_principal(context, &principal,
2332 realm, sAMAccountName, NULL);
2333 if (ret != 0) {
2334 goto out;
2335 }
2336
2337 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
2338 principal, SAMBA_KDC_ENT_TYPE_ANY,
2339 SDB_F_ADMIN_DATA|SDB_F_GET_ANY,
2340 priv->realm_dn, msg, entry);
2341
2342 out:
2343 if (principal != NULL) {
2344 krb5_free_principal(context, principal);
2345 }
2346
2347 if (ret != 0) {
2348 TALLOC_FREE(priv);
2349 kdc_db_ctx->seq_ctx = NULL;
2350 } else {
2351 talloc_free(mem_ctx);
2352 }
2353
2354 return ret;
2355 }
2356
2357 krb5_error_code samba_kdc_firstkey(krb5_context context,
2358 struct samba_kdc_db_context *kdc_db_ctx,
2359 struct sdb_entry_ex *entry)
2360 {
2361 struct ldb_context *ldb_ctx = kdc_db_ctx->samdb;
2362 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
2363 char *realm;
2364 struct ldb_result *res = NULL;
2365 krb5_error_code ret;
2366 TALLOC_CTX *mem_ctx;
2367 int lret;
2368
2369 if (priv) {
2370 TALLOC_FREE(priv);
2371 kdc_db_ctx->seq_ctx = NULL;
2372 }
2373
2374 priv = (struct samba_kdc_seq *) talloc(kdc_db_ctx, struct samba_kdc_seq);
2375 if (!priv) {
2376 ret = ENOMEM;
2377 krb5_set_error_message(context, ret, "talloc: out of memory");
2378 return ret;
2379 }
2380
2381 priv->index = 0;
2382 priv->msgs = NULL;
2383 priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
2384 priv->count = 0;
2385
2386 mem_ctx = talloc_named(priv, 0, "samba_kdc_firstkey context");
2387
2388 if (!mem_ctx) {
2389 ret = ENOMEM;
2390 krb5_set_error_message(context, ret, "samba_kdc_firstkey: talloc_named() failed!");
2391 return ret;
2392 }
2393
2394 ret = krb5_get_default_realm(context, &realm);
2395 if (ret != 0) {
2396 TALLOC_FREE(priv);
2397 return ret;
2398 }
2399 krb5_free_default_realm(context, realm);
2400
2401 lret = dsdb_search(ldb_ctx, priv, &res,
2402 priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
2403 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2404 "(objectClass=user)");
2405
2406 if (lret != LDB_SUCCESS) {
2407 TALLOC_FREE(priv);
2408 return SDB_ERR_NOENTRY;
2409 }
2410
2411 priv->count = res->count;
2412 priv->msgs = talloc_steal(priv, res->msgs);
2413 talloc_free(res);
2414
2415 kdc_db_ctx->seq_ctx = priv;
2416
2417 ret = samba_kdc_seq(context, kdc_db_ctx, entry);
2418
2419 if (ret != 0) {
2420 TALLOC_FREE(priv);
2421 kdc_db_ctx->seq_ctx = NULL;
2422 } else {
2423 talloc_free(mem_ctx);
2424 }
2425 return ret;
2426 }
2427
2428 krb5_error_code samba_kdc_nextkey(krb5_context context,
2429 struct samba_kdc_db_context *kdc_db_ctx,
2430 struct sdb_entry_ex *entry)
2431 {
2432 return samba_kdc_seq(context, kdc_db_ctx, entry);
2433 }
2434
2435 /* Check if a given entry may delegate or do s4u2self to this target principal
2436 *
2437 * This is currently a very nasty hack - allowing only delegation to itself.
2438 */
2439 krb5_error_code
2440 samba_kdc_check_s4u2self(krb5_context context,
2441 struct samba_kdc_db_context *kdc_db_ctx,
2442 struct samba_kdc_entry *skdc_entry,
2443 krb5_const_principal target_principal)
2444 {
2445 krb5_error_code ret;
2446 struct ldb_dn *realm_dn;
2447 struct ldb_message *msg;
2448 struct dom_sid *orig_sid;
2449 struct dom_sid *target_sid;
2450 const char *delegation_check_attrs[] = {
2451 "objectSid", NULL
2452 };
2453
2454 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2self");
2455
2456 if (!mem_ctx) {
2457 ret = ENOMEM;
2458 krb5_set_error_message(context, ret, "samba_kdc_check_s4u2self: talloc_named() failed!");
2459 return ret;
2460 }
2461
2462 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, target_principal,
2463 SDB_F_GET_CLIENT|SDB_F_GET_SERVER,
2464 delegation_check_attrs, &realm_dn, &msg);
2465
2466 if (ret != 0) {
2467 talloc_free(mem_ctx);
2468 return ret;
2469 }
2470
2471 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2472 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2473
2474 /* Allow delegation to the same principal, even if by a different
2475 * name. The easy and safe way to prove this is by SID
2476 * comparison */
2477 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2478 talloc_free(mem_ctx);
2479 return KRB5KDC_ERR_BADOPTION;
2480 }
2481
2482 talloc_free(mem_ctx);
2483 return ret;
2484 }
2485
2486 /* Certificates printed by a the Certificate Authority might have a
2487 * slightly different form of the user principal name to that in the
2488 * database. Allow a mismatch where they both refer to the same
2489 * SID */
2490
2491 krb5_error_code
2492 samba_kdc_check_pkinit_ms_upn_match(krb5_context context,
2493 struct samba_kdc_db_context *kdc_db_ctx,
2494 struct samba_kdc_entry *skdc_entry,
2495 krb5_const_principal certificate_principal)
2496 {
2497 krb5_error_code ret;
2498 struct ldb_dn *realm_dn;
2499 struct ldb_message *msg;
2500 struct dom_sid *orig_sid;
2501 struct dom_sid *target_sid;
2502 const char *ms_upn_check_attrs[] = {
2503 "objectSid", NULL
2504 };
2505
2506 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_pkinit_ms_upn_match");
2507
2508 if (!mem_ctx) {
2509 ret = ENOMEM;
2510 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2511 return ret;
2512 }
2513
2514 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
2515 mem_ctx, certificate_principal,
2516 ms_upn_check_attrs, &realm_dn, &msg);
2517
2518 if (ret != 0) {
2519 talloc_free(mem_ctx);
2520 return ret;
2521 }
2522
2523 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2524 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2525
2526 /* Consider these to be the same principal, even if by a different
2527 * name. The easy and safe way to prove this is by SID
2528 * comparison */
2529 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2530 talloc_free(mem_ctx);
2531 #ifdef KRB5_KDC_ERR_CLIENT_NAME_MISMATCH /* Heimdal */
2532 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
2533 #elif defined(KRB5KDC_ERR_CLIENT_NAME_MISMATCH) /* MIT */
2534 return KRB5KDC_ERR_CLIENT_NAME_MISMATCH;
2535 #endif
2536 }
2537
2538 talloc_free(mem_ctx);
2539 return ret;
2540 }
2541
2542 /*
2543 * Check if a given entry may delegate to this target principal
2544 * with S4U2Proxy.
2545 */
2546 krb5_error_code
2547 samba_kdc_check_s4u2proxy(krb5_context context,
2548 struct samba_kdc_db_context *kdc_db_ctx,
2549 struct samba_kdc_entry *skdc_entry,
2550 krb5_const_principal target_principal)
2551 {
2552 krb5_error_code ret;
2553 char *tmp = NULL;
2554 const char *client_dn = NULL;
2555 const char *target_principal_name = NULL;
2556 struct ldb_message_element *el;
2557 struct ldb_val val;
2558 unsigned int i;
2559 bool found = false;
2560
2561 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2proxy");
2562
2563 if (!mem_ctx) {
2564 ret = ENOMEM;
2565 krb5_set_error_message(context, ret,
2566 "samba_kdc_check_s4u2proxy:"
2567 " talloc_named() failed!");
2568 return ret;
2569 }
2570
2571 client_dn = ldb_dn_get_linearized(skdc_entry->msg->dn);
2572 if (!client_dn) {
2573 if (errno == 0) {
2574 errno = ENOMEM;
2575 }
2576 ret = errno;
2577 krb5_set_error_message(context, ret,
2578 "samba_kdc_check_s4u2proxy:"
2579 " ldb_dn_get_linearized() failed!");
2580 return ret;
2581 }
2582
2583 /*
2584 * The main heimdal code already checked that the target_principal
2585 * belongs to the same realm as the client.
2586 *
2587 * So we just need the principal without the realm,
2588 * as that is what is configured in the "msDS-AllowedToDelegateTo"
2589 * attribute.
2590 */
2591 ret = krb5_unparse_name_flags(context, target_principal,
2592 KRB5_PRINCIPAL_UNPARSE_NO_REALM, &tmp);
2593 if (ret) {
2594 talloc_free(mem_ctx);
2595 krb5_set_error_message(context, ret,
2596 "samba_kdc_check_s4u2proxy:"
2597 " krb5_unparse_name() failed!");
2598 return ret;
2599 }
2600 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] for target[%s]\n",
2601 client_dn, tmp));
2602
2603 target_principal_name = talloc_strdup(mem_ctx, tmp);
2604 SAFE_FREE(tmp);
2605 if (target_principal_name == NULL) {
2606 ret = ENOMEM;
2607 krb5_set_error_message(context, ret,
2608 "samba_kdc_check_s4u2proxy:"
2609 " talloc_strdup() failed!");
2610 return ret;
2611 }
2612
2613 el = ldb_msg_find_element(skdc_entry->msg, "msDS-AllowedToDelegateTo");
2614 if (el == NULL) {
2615 goto bad_option;
2616 }
2617
2618 val = data_blob_string_const(target_principal_name);
2619
2620 for (i=0; i<el->num_values; i++) {
2621 struct ldb_val *val1 = &val;
2622 struct ldb_val *val2 = &el->values[i];
2623 int cmp;
2624
2625 if (val1->length != val2->length) {
2626 continue;
2627 }
2628
2629 cmp = strncasecmp((const char *)val1->data,
2630 (const char *)val2->data,
2631 val1->length);
2632 if (cmp != 0) {
2633 continue;
2634 }
2635
2636 found = true;
2637 break;
2638 }
2639
2640 if (!found) {
2641 goto bad_option;
2642 }
2643
2644 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] allowed target[%s]\n",
2645 client_dn, tmp));
2646 talloc_free(mem_ctx);
2647 return 0;
2648
2649 bad_option:
2650 krb5_set_error_message(context, ret,
2651 "samba_kdc_check_s4u2proxy: client[%s] "
2652 "not allowed for delegation to target[%s]",
2653 client_dn,
2654 target_principal_name);
2655 talloc_free(mem_ctx);
2656 return KRB5KDC_ERR_BADOPTION;
2657 }
2658
2659 NTSTATUS samba_kdc_setup_db_ctx(TALLOC_CTX *mem_ctx, struct samba_kdc_base_context *base_ctx,
2660 struct samba_kdc_db_context **kdc_db_ctx_out)
2661 {
2662 int ldb_ret;
2663 struct ldb_message *msg;
2664 struct auth_session_info *session_info;
2665 struct samba_kdc_db_context *kdc_db_ctx;
2666 /* The idea here is very simple. Using Kerberos to
2667 * authenticate the KDC to the LDAP server is higly likely to
2668 * be circular.
2669 *
2670 * In future we may set this up to use EXERNAL and SSL
2671 * certificates, for now it will almost certainly be NTLMSSP_SET_USERNAME
2672 */
2673
2674 kdc_db_ctx = talloc_zero(mem_ctx, struct samba_kdc_db_context);
2675 if (kdc_db_ctx == NULL) {
2676 return NT_STATUS_NO_MEMORY;
2677 }
2678 kdc_db_ctx->ev_ctx = base_ctx->ev_ctx;
2679 kdc_db_ctx->lp_ctx = base_ctx->lp_ctx;
2680
2681 /* get default kdc policy */
2682 lpcfg_default_kdc_policy(base_ctx->lp_ctx,
2683 &kdc_db_ctx->policy.svc_tkt_lifetime,
2684 &kdc_db_ctx->policy.usr_tkt_lifetime,
2685 &kdc_db_ctx->policy.renewal_lifetime);
2686
2687 session_info = system_session(kdc_db_ctx->lp_ctx);
2688 if (session_info == NULL) {
2689 return NT_STATUS_INTERNAL_ERROR;
2690 }
2691
2692 /* Setup the link to LDB */
2693 kdc_db_ctx->samdb = samdb_connect(kdc_db_ctx, base_ctx->ev_ctx,
2694 base_ctx->lp_ctx, session_info, 0);
2695 if (kdc_db_ctx->samdb == NULL) {
2696 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot open samdb for KDC backend!"));
2697 talloc_free(kdc_db_ctx);
2698 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2699 }
2700
2701 /* Find out our own krbtgt kvno */
2702 ldb_ret = samdb_rodc(kdc_db_ctx->samdb, &kdc_db_ctx->rodc);
2703 if (ldb_ret != LDB_SUCCESS) {
2704 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine if we are an RODC in KDC backend: %s\n",
2705 ldb_errstring(kdc_db_ctx->samdb)));
2706 talloc_free(kdc_db_ctx);
2707 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2708 }
2709 if (kdc_db_ctx->rodc) {
2710 int my_krbtgt_number;
2711 const char *secondary_keytab[] = { "msDS-SecondaryKrbTgtNumber", NULL };
2712 struct ldb_dn *account_dn;
2713 struct ldb_dn *server_dn = samdb_server_dn(kdc_db_ctx->samdb, kdc_db_ctx);
2714 if (!server_dn) {
2715 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server DN in KDC backend: %s\n",
2716 ldb_errstring(kdc_db_ctx->samdb)));
2717 talloc_free(kdc_db_ctx);
2718 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2719 }
2720
2721 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, server_dn,
2722 "serverReference", &account_dn);
2723 if (ldb_ret != LDB_SUCCESS) {
2724 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server account in KDC backend: %s\n",
2725 ldb_errstring(kdc_db_ctx->samdb)));
2726 talloc_free(kdc_db_ctx);
2727 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2728 }
2729
2730 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, account_dn,
2731 "msDS-KrbTgtLink", &kdc_db_ctx->krbtgt_dn);
2732 talloc_free(account_dn);
2733 if (ldb_ret != LDB_SUCCESS) {
2734 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine RODC krbtgt account in KDC backend: %s\n",
2735 ldb_errstring(kdc_db_ctx->samdb)));
2736 talloc_free(kdc_db_ctx);
2737 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2738 }
2739
2740 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2741 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
2742 secondary_keytab,
2743 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2744 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=*))");
2745 if (ldb_ret != LDB_SUCCESS) {
2746 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read krbtgt account %s in KDC backend to get msDS-SecondaryKrbTgtNumber: %s: %s\n",
2747 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2748 ldb_errstring(kdc_db_ctx->samdb),
2749 ldb_strerror(ldb_ret)));
2750 talloc_free(kdc_db_ctx);
2751 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2752 }
2753 my_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
2754 if (my_krbtgt_number == -1) {
2755 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read msDS-SecondaryKrbTgtNumber from krbtgt account %s in KDC backend: got %d\n",
2756 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2757 my_krbtgt_number));
2758 talloc_free(kdc_db_ctx);
2759 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2760 }
2761 kdc_db_ctx->my_krbtgt_number = my_krbtgt_number;
2762
2763 } else {
2764 kdc_db_ctx->my_krbtgt_number = 0;
2765 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2766 &msg,
2767 ldb_get_default_basedn(kdc_db_ctx->samdb),
2768 LDB_SCOPE_SUBTREE,
2769 krbtgt_attrs,
2770 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2771 "(&(objectClass=user)(samAccountName=krbtgt))");
2772
2773 if (ldb_ret != LDB_SUCCESS) {
2774 DEBUG(1, ("samba_kdc_fetch: could not find own KRBTGT in DB: %s\n", ldb_errstring(kdc_db_ctx->samdb)));
2775 talloc_free(kdc_db_ctx);
2776 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2777 }
2778 kdc_db_ctx->krbtgt_dn = talloc_steal(kdc_db_ctx, msg->dn);
2779 kdc_db_ctx->my_krbtgt_number = 0;
2780 talloc_free(msg);
2781 }
2782 *kdc_db_ctx_out = kdc_db_ctx;
2783 return NT_STATUS_OK;
2784 }
Samba GIT mirror