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talloc: version 2.1.10
[Samba.git] / source4 / kdc / db-glue.c
blob9ac5a1d38f06d227ad1eb4bc37f64a9656cb3d92
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 #include "librpc/gen_ndr/ndr_irpc_c.h"
39 #include "lib/messaging/irpc.h"
40
41
42 #define SAMBA_KVNO_GET_KRBTGT(kvno) \
43 ((uint16_t)(((uint32_t)kvno) >> 16))
44
45 #define SAMBA_KVNO_AND_KRBTGT(kvno, krbtgt) \
46 ((krb5_kvno)((((uint32_t)kvno) & 0xFFFF) | \
47 ((((uint32_t)krbtgt) << 16) & 0xFFFF0000)))
48
49 enum samba_kdc_ent_type
50 { SAMBA_KDC_ENT_TYPE_CLIENT, SAMBA_KDC_ENT_TYPE_SERVER,
51 SAMBA_KDC_ENT_TYPE_KRBTGT, SAMBA_KDC_ENT_TYPE_TRUST, SAMBA_KDC_ENT_TYPE_ANY };
52
53 enum trust_direction {
54 UNKNOWN = 0,
55 INBOUND = LSA_TRUST_DIRECTION_INBOUND,
56 OUTBOUND = LSA_TRUST_DIRECTION_OUTBOUND
57 };
58
59 static const char *trust_attrs[] = {
60 "trustPartner",
61 "trustAuthIncoming",
62 "trustAuthOutgoing",
63 "whenCreated",
64 "msDS-SupportedEncryptionTypes",
65 "trustAttributes",
66 "trustDirection",
67 "trustType",
68 NULL
69 };
70
71 /*
72 send a message to the drepl server telling it to initiate a
73 REPL_SECRET getncchanges extended op to fetch the users secrets
74 */
75 static void auth_sam_trigger_repl_secret(TALLOC_CTX *mem_ctx,
76 struct imessaging_context *msg_ctx,
77 struct tevent_context *event_ctx,
78 struct ldb_dn *user_dn)
79 {
80 struct dcerpc_binding_handle *irpc_handle;
81 struct drepl_trigger_repl_secret r;
82 struct tevent_req *req;
83 TALLOC_CTX *tmp_ctx;
84
85 tmp_ctx = talloc_new(mem_ctx);
86 if (tmp_ctx == NULL) {
87 return;
88 }
89
90 irpc_handle = irpc_binding_handle_by_name(tmp_ctx, msg_ctx,
91 "dreplsrv",
92 &ndr_table_irpc);
93 if (irpc_handle == NULL) {
94 DEBUG(1,(__location__ ": Unable to get binding handle for dreplsrv\n"));
95 TALLOC_FREE(tmp_ctx);
96 return;
97 }
98
99 r.in.user_dn = ldb_dn_get_linearized(user_dn);
100
101 /*
102 * This seem to rely on the current IRPC implementation,
103 * which delivers the message in the _send function.
104 *
105 * TODO: we need a ONE_WAY IRPC handle and register
106 * a callback and wait for it to be triggered!
107 */
108 req = dcerpc_drepl_trigger_repl_secret_r_send(tmp_ctx,
109 event_ctx,
110 irpc_handle,
111 &r);
112
113 /* we aren't interested in a reply */
114 talloc_free(req);
115 TALLOC_FREE(tmp_ctx);
116 }
117
118 static time_t ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, time_t default_val)
119 {
120 const char *tmp;
121 const char *gentime;
122 struct tm tm;
123
124 gentime = ldb_msg_find_attr_as_string(msg, attr, NULL);
125 if (!gentime)
126 return default_val;
127
128 tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
129 if (tmp == NULL) {
130 return default_val;
131 }
132
133 return timegm(&tm);
134 }
135
136 static struct SDBFlags uf2SDBFlags(krb5_context context, uint32_t userAccountControl, enum samba_kdc_ent_type ent_type)
137 {
138 struct SDBFlags flags = int2SDBFlags(0);
139
140 /* we don't allow kadmin deletes */
141 flags.immutable = 1;
142
143 /* mark the principal as invalid to start with */
144 flags.invalid = 1;
145
146 flags.renewable = 1;
147
148 /* All accounts are servers, but this may be disabled again in the caller */
149 flags.server = 1;
150
151 /* Account types - clear the invalid bit if it turns out to be valid */
152 if (userAccountControl & UF_NORMAL_ACCOUNT) {
153 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
154 flags.client = 1;
155 }
156 flags.invalid = 0;
157 }
158
159 if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
160 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
161 flags.client = 1;
162 }
163 flags.invalid = 0;
164 }
165 if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
166 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
167 flags.client = 1;
168 }
169 flags.invalid = 0;
170 }
171 if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
172 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
173 flags.client = 1;
174 }
175 flags.invalid = 0;
176 }
177
178 /* Not permitted to act as a client if disabled */
179 if (userAccountControl & UF_ACCOUNTDISABLE) {
180 flags.client = 0;
181 }
182 if (userAccountControl & UF_LOCKOUT) {
183 flags.locked_out = 1;
184 }
185 /*
186 if (userAccountControl & UF_PASSWORD_NOTREQD) {
187 flags.invalid = 1;
188 }
189 */
190 /*
191 UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent
192 */
193 if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
194 flags.invalid = 1;
195 }
196
197 /* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in samba_kdc_message2entry() */
198
199 /*
200 if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
201 flags.invalid = 1;
202 }
203 */
204 if (userAccountControl & UF_SMARTCARD_REQUIRED) {
205 flags.require_hwauth = 1;
206 }
207 if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
208 flags.ok_as_delegate = 1;
209 }
210 if (userAccountControl & UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION) {
211 /*
212 * this is confusing...
213 *
214 * UF_TRUSTED_FOR_DELEGATION
215 * => ok_as_delegate
216 *
217 * and
218 *
219 * UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION
220 * => trusted_for_delegation
221 */
222 flags.trusted_for_delegation = 1;
223 }
224 if (!(userAccountControl & UF_NOT_DELEGATED)) {
225 flags.forwardable = 1;
226 flags.proxiable = 1;
227 }
228
229 if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
230 flags.require_preauth = 0;
231 } else {
232 flags.require_preauth = 1;
233
234 }
235 return flags;
236 }
237
238 static int samba_kdc_entry_destructor(struct samba_kdc_entry *p)
239 {
240 if (p->entry_ex != NULL) {
241 struct sdb_entry_ex *entry_ex = p->entry_ex;
242 free_sdb_entry(&entry_ex->entry);
243 }
244
245 return 0;
246 }
247
248 /*
249 * Sort keys in descending order of strength.
250 *
251 * Explanaton from Greg Hudson:
252 *
253 * To encrypt tickets only the first returned key is used by the MIT KDC. The
254 * other keys just communicate support for session key enctypes, and aren't
255 * really used. The encryption key for the ticket enc part doesn't have
256 * to be of a type requested by the client. The session key enctype is chosen
257 * based on the client preference order, limited by the set of enctypes present
258 * in the server keys (unless the string attribute is set on the server
259 * principal overriding that set).
260 */
261 static int samba_kdc_sort_encryption_keys(struct sdb_entry_ex *entry_ex)
262 {
263 unsigned int i, j, idx = 0;
264 static const krb5_enctype etype_list[] = {
265 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
266 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
267 ENCTYPE_DES3_CBC_SHA1,
268 ENCTYPE_ARCFOUR_HMAC,
269 ENCTYPE_DES_CBC_MD5,
270 ENCTYPE_DES_CBC_MD4,
271 ENCTYPE_DES_CBC_CRC,
272 ENCTYPE_NULL
273 };
274 size_t etype_len = ARRAY_SIZE(etype_list);
275 size_t keys_size = entry_ex->entry.keys.len;
276 struct sdb_key *keys = entry_ex->entry.keys.val;
277 struct sdb_key *sorted_keys;
278
279 sorted_keys = calloc(keys_size, sizeof(struct sdb_key));
280 if (sorted_keys == NULL) {
281 return -1;
282 }
283
284 for (i = 0; i < etype_len; i++) {
285 for (j = 0; j < keys_size; j++) {
286 const struct sdb_key skey = keys[j];
287
288 if (idx == keys_size) {
289 break;
290 }
291
292 if (KRB5_KEY_TYPE(&skey.key) == etype_list[i]) {
293 sorted_keys[idx] = skey;
294 idx++;
295 }
296 }
297 }
298
299 /* Paranoia: Something went wrong during data copy */
300 if (idx != keys_size) {
301 free(sorted_keys);
302 return -1;
303 }
304
305 free(entry_ex->entry.keys.val);
306 entry_ex->entry.keys.val = sorted_keys;
307
308 return 0;
309 }
310
311 static krb5_error_code samba_kdc_message2entry_keys(krb5_context context,
312 struct samba_kdc_db_context *kdc_db_ctx,
313 TALLOC_CTX *mem_ctx,
314 struct ldb_message *msg,
315 uint32_t rid,
316 bool is_rodc,
317 uint32_t userAccountControl,
318 enum samba_kdc_ent_type ent_type,
319 struct sdb_entry_ex *entry_ex)
320 {
321 krb5_error_code ret = 0;
322 enum ndr_err_code ndr_err;
323 struct samr_Password *hash;
324 const struct ldb_val *sc_val;
325 struct supplementalCredentialsBlob scb;
326 struct supplementalCredentialsPackage *scpk = NULL;
327 bool newer_keys = false;
328 struct package_PrimaryKerberosBlob _pkb;
329 struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
330 struct package_PrimaryKerberosCtr4 *pkb4 = NULL;
331 uint16_t i;
332 uint16_t allocated_keys = 0;
333 int rodc_krbtgt_number = 0;
334 int kvno = 0;
335 uint32_t supported_enctypes
336 = ldb_msg_find_attr_as_uint(msg,
337 "msDS-SupportedEncryptionTypes",
338 0);
339
340 if (rid == DOMAIN_RID_KRBTGT || is_rodc) {
341 /* KDCs (and KDCs on RODCs) use AES */
342 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
343 } else if (userAccountControl & (UF_PARTIAL_SECRETS_ACCOUNT|UF_SERVER_TRUST_ACCOUNT)) {
344 /* DCs and RODCs comptuer accounts use AES */
345 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
346 } else if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT ||
347 (ent_type == SAMBA_KDC_ENT_TYPE_ANY)) {
348 /* for AS-REQ the client chooses the enc types it
349 * supports, and this will vary between computers a
350 * user logs in from.
351 *
352 * likewise for 'any' return as much as is supported,
353 * to export into a keytab */
354 supported_enctypes = ENC_ALL_TYPES;
355 }
356
357 /* If UF_USE_DES_KEY_ONLY has been set, then don't allow use of the newer enc types */
358 if (userAccountControl & UF_USE_DES_KEY_ONLY) {
359 supported_enctypes = ENC_CRC32|ENC_RSA_MD5;
360 } else {
361 /* Otherwise, add in the default enc types */
362 supported_enctypes |= ENC_CRC32 | ENC_RSA_MD5 | ENC_RC4_HMAC_MD5;
363 }
364
365 /* Is this the krbtgt or a RODC krbtgt */
366 if (is_rodc) {
367 rodc_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
368
369 if (rodc_krbtgt_number == -1) {
370 return EINVAL;
371 }
372 }
373
374 entry_ex->entry.keys.val = NULL;
375 entry_ex->entry.keys.len = 0;
376 entry_ex->entry.kvno = 0;
377
378 if ((ent_type == SAMBA_KDC_ENT_TYPE_CLIENT)
379 && (userAccountControl & UF_SMARTCARD_REQUIRED)) {
380 uint8_t secretbuffer[32];
381
382 /*
383 * Fake keys until we have a better way to reject
384 * non-pkinit requests.
385 *
386 * We just need to indicate which encryption types are
387 * supported.
388 */
389 generate_secret_buffer(secretbuffer, sizeof(secretbuffer));
390
391 allocated_keys = 3;
392 entry_ex->entry.keys.len = 0;
393 entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(struct sdb_key));
394 if (entry_ex->entry.keys.val == NULL) {
395 ZERO_STRUCT(secretbuffer);
396 ret = ENOMEM;
397 goto out;
398 }
399
400 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
401 struct sdb_key key = {};
402
403 ret = smb_krb5_keyblock_init_contents(context,
404 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
405 secretbuffer, 32,
406 &key.key);
407 if (ret) {
408 ZERO_STRUCT(secretbuffer);
409 goto out;
410 }
411
412 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
413 entry_ex->entry.keys.len++;
414 }
415
416 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
417 struct sdb_key key = {};
418
419 ret = smb_krb5_keyblock_init_contents(context,
420 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
421 secretbuffer, 16,
422 &key.key);
423 if (ret) {
424 ZERO_STRUCT(secretbuffer);
425 goto out;
426 }
427
428 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
429 entry_ex->entry.keys.len++;
430 }
431
432 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
433 struct sdb_key key = {};
434
435 ret = smb_krb5_keyblock_init_contents(context,
436 ENCTYPE_ARCFOUR_HMAC,
437 secretbuffer, 16,
438 &key.key);
439 if (ret) {
440 ZERO_STRUCT(secretbuffer);
441 goto out;
442 }
443
444 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
445 entry_ex->entry.keys.len++;
446 }
447
448 ret = 0;
449 goto out;
450 }
451
452 kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
453 if (is_rodc) {
454 kvno = SAMBA_KVNO_AND_KRBTGT(kvno, rodc_krbtgt_number);
455 }
456 entry_ex->entry.kvno = kvno;
457
458 /* Get keys from the db */
459
460 hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
461 sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
462
463 /* unicodePwd for enctype 0x17 (23) if present */
464 if (hash) {
465 allocated_keys++;
466 }
467
468 /* supplementalCredentials if present */
469 if (sc_val) {
470 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, &scb,
471 (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
472 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
473 dump_data(0, sc_val->data, sc_val->length);
474 ret = EINVAL;
475 goto out;
476 }
477
478 if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) {
479 if (scb.sub.num_packages != 0) {
480 NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
481 ret = EINVAL;
482 goto out;
483 }
484 }
485
486 for (i=0; i < scb.sub.num_packages; i++) {
487 if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) {
488 scpk = &scb.sub.packages[i];
489 if (!scpk->data || !scpk->data[0]) {
490 scpk = NULL;
491 continue;
492 }
493 newer_keys = true;
494 break;
495 } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) {
496 scpk = &scb.sub.packages[i];
497 if (!scpk->data || !scpk->data[0]) {
498 scpk = NULL;
499 }
500 /*
501 * we don't break here in hope to find
502 * a Kerberos-Newer-Keys package
503 */
504 }
505 }
506 }
507 /*
508 * Primary:Kerberos-Newer-Keys or Primary:Kerberos element
509 * of supplementalCredentials
510 */
511 if (scpk) {
512 DATA_BLOB blob;
513
514 blob = strhex_to_data_blob(mem_ctx, scpk->data);
515 if (!blob.data) {
516 ret = ENOMEM;
517 goto out;
518 }
519
520 /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */
521 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &_pkb,
522 (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
523 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
524 ret = EINVAL;
525 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
526 krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
527 goto out;
528 }
529
530 if (newer_keys && _pkb.version != 4) {
531 ret = EINVAL;
532 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
533 krb5_warnx(context, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
534 goto out;
535 }
536
537 if (!newer_keys && _pkb.version != 3) {
538 ret = EINVAL;
539 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
540 krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
541 goto out;
542 }
543
544 if (_pkb.version == 4) {
545 pkb4 = &_pkb.ctr.ctr4;
546 allocated_keys += pkb4->num_keys;
547 } else if (_pkb.version == 3) {
548 pkb3 = &_pkb.ctr.ctr3;
549 allocated_keys += pkb3->num_keys;
550 }
551 }
552
553 if (allocated_keys == 0) {
554 if (kdc_db_ctx->rodc) {
555 /* We are on an RODC, but don't have keys for this account. Signal this to the caller */
556 auth_sam_trigger_repl_secret(kdc_db_ctx, kdc_db_ctx->msg_ctx,
557 kdc_db_ctx->ev_ctx, msg->dn);
558 return SDB_ERR_NOT_FOUND_HERE;
559 }
560
561 /* oh, no password. Apparently (comment in
562 * hdb-ldap.c) this violates the ASN.1, but this
563 * allows an entry with no keys (yet). */
564 return 0;
565 }
566
567 /* allocate space to decode into */
568 entry_ex->entry.keys.len = 0;
569 entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(struct sdb_key));
570 if (entry_ex->entry.keys.val == NULL) {
571 ret = ENOMEM;
572 goto out;
573 }
574
575 if (hash && (supported_enctypes & ENC_RC4_HMAC_MD5)) {
576 struct sdb_key key = {};
577
578 ret = smb_krb5_keyblock_init_contents(context,
579 ENCTYPE_ARCFOUR_HMAC,
580 hash->hash,
581 sizeof(hash->hash),
582 &key.key);
583 if (ret) {
584 goto out;
585 }
586
587 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
588 entry_ex->entry.keys.len++;
589 }
590
591 if (pkb4) {
592 for (i=0; i < pkb4->num_keys; i++) {
593 struct sdb_key key = {};
594
595 if (!pkb4->keys[i].value) continue;
596
597 if (!(kerberos_enctype_to_bitmap(pkb4->keys[i].keytype) & supported_enctypes)) {
598 continue;
599 }
600
601 if (pkb4->salt.string) {
602 DATA_BLOB salt;
603
604 salt = data_blob_string_const(pkb4->salt.string);
605
606 key.salt = calloc(1, sizeof(*key.salt));
607 if (key.salt == NULL) {
608 ret = ENOMEM;
609 goto out;
610 }
611
612 key.salt->type = KRB5_PW_SALT;
613
614 ret = smb_krb5_copy_data_contents(&key.salt->salt,
615 salt.data,
616 salt.length);
617 if (ret) {
618 free(key.salt);
619 key.salt = NULL;
620 goto out;
621 }
622 }
623
624 /* TODO: maybe pass the iteration_count somehow... */
625
626 ret = smb_krb5_keyblock_init_contents(context,
627 pkb4->keys[i].keytype,
628 pkb4->keys[i].value->data,
629 pkb4->keys[i].value->length,
630 &key.key);
631 if (ret == KRB5_PROG_ETYPE_NOSUPP) {
632 DEBUG(2,("Unsupported keytype ignored - type %u\n",
633 pkb4->keys[i].keytype));
634 ret = 0;
635 continue;
636 }
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 } else if (pkb3) {
650 for (i=0; i < pkb3->num_keys; i++) {
651 struct sdb_key key = {};
652
653 if (!pkb3->keys[i].value) continue;
654
655 if (!(kerberos_enctype_to_bitmap(pkb3->keys[i].keytype) & supported_enctypes)) {
656 continue;
657 }
658
659 if (pkb3->salt.string) {
660 DATA_BLOB salt;
661
662 salt = data_blob_string_const(pkb3->salt.string);
663
664 key.salt = calloc(1, sizeof(*key.salt));
665 if (key.salt == NULL) {
666 ret = ENOMEM;
667 goto out;
668 }
669
670 key.salt->type = KRB5_PW_SALT;
671
672 ret = smb_krb5_copy_data_contents(&key.salt->salt,
673 salt.data,
674 salt.length);
675 if (ret) {
676 free(key.salt);
677 key.salt = NULL;
678 goto out;
679 }
680 }
681
682 ret = smb_krb5_keyblock_init_contents(context,
683 pkb3->keys[i].keytype,
684 pkb3->keys[i].value->data,
685 pkb3->keys[i].value->length,
686 &key.key);
687 if (ret) {
688 if (key.salt) {
689 smb_krb5_free_data_contents(context, &key.salt->salt);
690 free(key.salt);
691 key.salt = NULL;
692 }
693 goto out;
694 }
695
696 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
697 entry_ex->entry.keys.len++;
698 }
699 }
700
701 out:
702 if (ret != 0) {
703 entry_ex->entry.keys.len = 0;
704 } else if (entry_ex->entry.keys.len > 0 &&
705 entry_ex->entry.keys.val != NULL) {
706 ret = samba_kdc_sort_encryption_keys(entry_ex);
707 if (ret != 0) {
708 entry_ex->entry.keys.len = 0;
709 ret = ENOMEM;
710 }
711 }
712 if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
713 free(entry_ex->entry.keys.val);
714 entry_ex->entry.keys.val = NULL;
715 }
716 return ret;
717 }
718
719 static int principal_comp_strcmp_int(krb5_context context,
720 krb5_const_principal principal,
721 unsigned int component,
722 const char *string,
723 bool do_strcasecmp)
724 {
725 const char *p;
726 size_t len;
727
728 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
729 p = krb5_principal_get_comp_string(context, principal, component);
730 if (p == NULL) {
731 return -1;
732 }
733 len = strlen(p);
734 #else
735 krb5_data *d;
736 if (component >= krb5_princ_size(context, principal)) {
737 return -1;
738 }
739
740 d = krb5_princ_component(context, principal, component);
741 if (d == NULL) {
742 return -1;
743 }
744
745 p = d->data;
746 len = d->length;
747 #endif
748 if (do_strcasecmp) {
749 return strncasecmp(p, string, len);
750 } else {
751 return strncmp(p, string, len);
752 }
753 }
754
755 static int principal_comp_strcasecmp(krb5_context context,
756 krb5_const_principal principal,
757 unsigned int component,
758 const char *string)
759 {
760 return principal_comp_strcmp_int(context, principal,
761 component, string, true);
762 }
763
764 static int principal_comp_strcmp(krb5_context context,
765 krb5_const_principal principal,
766 unsigned int component,
767 const char *string)
768 {
769 return principal_comp_strcmp_int(context, principal,
770 component, string, false);
771 }
772
773 /*
774 * Construct an hdb_entry from a directory entry.
775 */
776 static krb5_error_code samba_kdc_message2entry(krb5_context context,
777 struct samba_kdc_db_context *kdc_db_ctx,
778 TALLOC_CTX *mem_ctx,
779 krb5_const_principal principal,
780 enum samba_kdc_ent_type ent_type,
781 unsigned flags,
782 struct ldb_dn *realm_dn,
783 struct ldb_message *msg,
784 struct sdb_entry_ex *entry_ex)
785 {
786 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
787 uint32_t userAccountControl;
788 uint32_t msDS_User_Account_Control_Computed;
789 krb5_error_code ret = 0;
790 krb5_boolean is_computer = FALSE;
791
792 struct samba_kdc_entry *p;
793 NTTIME acct_expiry;
794 NTSTATUS status;
795
796 uint32_t rid;
797 bool is_rodc = false;
798 struct ldb_message_element *objectclasses;
799 struct ldb_val computer_val;
800 const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
801 computer_val.data = discard_const_p(uint8_t,"computer");
802 computer_val.length = strlen((const char *)computer_val.data);
803
804 if (ldb_msg_find_element(msg, "msDS-SecondaryKrbTgtNumber")) {
805 is_rodc = true;
806 }
807
808 if (!samAccountName) {
809 ret = ENOENT;
810 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no samAccountName present");
811 goto out;
812 }
813
814 objectclasses = ldb_msg_find_element(msg, "objectClass");
815
816 if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
817 is_computer = TRUE;
818 }
819
820 ZERO_STRUCTP(entry_ex);
821
822 p = talloc_zero(mem_ctx, struct samba_kdc_entry);
823 if (!p) {
824 ret = ENOMEM;
825 goto out;
826 }
827
828 p->kdc_db_ctx = kdc_db_ctx;
829 p->realm_dn = talloc_reference(p, realm_dn);
830 if (!p->realm_dn) {
831 ret = ENOMEM;
832 goto out;
833 }
834
835 talloc_set_destructor(p, samba_kdc_entry_destructor);
836
837 entry_ex->ctx = p;
838
839 userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
840
841 msDS_User_Account_Control_Computed
842 = ldb_msg_find_attr_as_uint(msg,
843 "msDS-User-Account-Control-Computed",
844 UF_ACCOUNTDISABLE);
845
846 /*
847 * This brings in the lockout flag, block the account if not
848 * found. We need the weird UF_ACCOUNTDISABLE check because
849 * we do not want to fail open if the value is not returned,
850 * but 0 is a valid value (all OK)
851 */
852 if (msDS_User_Account_Control_Computed == UF_ACCOUNTDISABLE) {
853 ret = EINVAL;
854 krb5_set_error_message(context, ret, "samba_kdc_message2entry: "
855 "no msDS-User-Account-Control-Computed present");
856 goto out;
857 } else {
858 userAccountControl |= msDS_User_Account_Control_Computed;
859 }
860
861 /*
862 * If we are set to canonicalize, we get back the fixed UPPER
863 * case realm, and the real username (ie matching LDAP
864 * samAccountName)
865 *
866 * Otherwise, if we are set to enterprise, we
867 * get back the whole principal as-sent
868 *
869 * Finally, if we are not set to canonicalize, we get back the
870 * fixed UPPER case realm, but the as-sent username
871 */
872
873 if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT) {
874 if (flags & (SDB_F_CANON)) {
875 /*
876 * When requested to do so, ensure that the
877 * both realm values in the principal are set
878 * to the upper case, canonical realm
879 */
880 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal,
881 lpcfg_realm(lp_ctx), "krbtgt",
882 lpcfg_realm(lp_ctx), NULL);
883 if (ret) {
884 krb5_clear_error_message(context);
885 goto out;
886 }
887 smb_krb5_principal_set_type(context, entry_ex->entry.principal, KRB5_NT_SRV_INST);
888 } else {
889 ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
890 if (ret) {
891 krb5_clear_error_message(context);
892 goto out;
893 }
894 /*
895 * this appears to be required regardless of
896 * the canonicalize flag from the client
897 */
898 ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
899 if (ret) {
900 krb5_clear_error_message(context);
901 goto out;
902 }
903 }
904
905 } else if (ent_type == SAMBA_KDC_ENT_TYPE_ANY && principal == NULL) {
906 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
907 if (ret) {
908 krb5_clear_error_message(context);
909 goto out;
910 }
911 } else if (flags & SDB_F_CANON && flags & SDB_F_FOR_AS_REQ) {
912 /*
913 * SDB_F_CANON maps from the canonicalize flag in the
914 * packet, and has a different meaning between AS-REQ
915 * and TGS-REQ. We only change the principal in the AS-REQ case
916 */
917 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
918 if (ret) {
919 krb5_clear_error_message(context);
920 goto out;
921 }
922 } else {
923 ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
924 if (ret) {
925 krb5_clear_error_message(context);
926 goto out;
927 }
928
929 if (smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL) {
930 /* While we have copied the client principal, tests
931 * show that Win2k3 returns the 'corrected' realm, not
932 * the client-specified realm. This code attempts to
933 * replace the client principal's realm with the one
934 * we determine from our records */
935
936 /* this has to be with malloc() */
937 ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
938 if (ret) {
939 krb5_clear_error_message(context);
940 goto out;
941 }
942 }
943 }
944
945 /* First try and figure out the flags based on the userAccountControl */
946 entry_ex->entry.flags = uf2SDBFlags(context, userAccountControl, ent_type);
947
948 /* Windows 2008 seems to enforce this (very sensible) rule by
949 * default - don't allow offline attacks on a user's password
950 * by asking for a ticket to them as a service (encrypted with
951 * their probably patheticly insecure password) */
952
953 if (entry_ex->entry.flags.server
954 && lpcfg_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
955 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
956 entry_ex->entry.flags.server = 0;
957 }
958 }
959 /*
960 * To give the correct type of error to the client, we must
961 * not just return the entry without .server set, we must
962 * pretend the principal does not exist. Otherwise we may
963 * return ERR_POLICY instead of
964 * KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
965 */
966 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER && entry_ex->entry.flags.server == 0) {
967 ret = SDB_ERR_NOENTRY;
968 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no servicePrincipalName present for this server, refusing with no-such-entry");
969 goto out;
970 }
971 if (flags & SDB_F_ADMIN_DATA) {
972 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
973 * of the Heimdal KDC. They are stored in a the traditional
974 * DB for audit purposes, and still form part of the structure
975 * we must return */
976
977 /* use 'whenCreated' */
978 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
979 /* use 'kadmin' for now (needed by mit_samba) */
980
981 ret = smb_krb5_make_principal(context,
982 &entry_ex->entry.created_by.principal,
983 lpcfg_realm(lp_ctx), "kadmin", NULL);
984 if (ret) {
985 krb5_clear_error_message(context);
986 goto out;
987 }
988
989 entry_ex->entry.modified_by = (struct sdb_event *) malloc(sizeof(struct sdb_event));
990 if (entry_ex->entry.modified_by == NULL) {
991 ret = ENOMEM;
992 krb5_set_error_message(context, ret, "malloc: out of memory");
993 goto out;
994 }
995
996 /* use 'whenChanged' */
997 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
998 /* use 'kadmin' for now (needed by mit_samba) */
999 ret = smb_krb5_make_principal(context,
1000 &entry_ex->entry.modified_by->principal,
1001 lpcfg_realm(lp_ctx), "kadmin", NULL);
1002 if (ret) {
1003 krb5_clear_error_message(context);
1004 goto out;
1005 }
1006 }
1007
1008
1009 /* The lack of password controls etc applies to krbtgt by
1010 * virtue of being that particular RID */
1011 status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
1012
1013 if (!NT_STATUS_IS_OK(status)) {
1014 ret = EINVAL;
1015 goto out;
1016 }
1017
1018 if (rid == DOMAIN_RID_KRBTGT) {
1019 char *realm = NULL;
1020
1021 entry_ex->entry.valid_end = NULL;
1022 entry_ex->entry.pw_end = NULL;
1023
1024 entry_ex->entry.flags.invalid = 0;
1025 entry_ex->entry.flags.server = 1;
1026
1027 realm = smb_krb5_principal_get_realm(context, principal);
1028 if (realm == NULL) {
1029 ret = ENOMEM;
1030 goto out;
1031 }
1032
1033 /* Don't mark all requests for the krbtgt/realm as
1034 * 'change password', as otherwise we could get into
1035 * trouble, and not enforce the password expirty.
1036 * Instead, only do it when request is for the kpasswd service */
1037 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER
1038 && krb5_princ_size(context, principal) == 2
1039 && (principal_comp_strcmp(context, principal, 0, "kadmin") == 0)
1040 && (principal_comp_strcmp(context, principal, 1, "changepw") == 0)
1041 && lpcfg_is_my_domain_or_realm(lp_ctx, realm)) {
1042 entry_ex->entry.flags.change_pw = 1;
1043 }
1044
1045 SAFE_FREE(realm);
1046
1047 entry_ex->entry.flags.client = 0;
1048 entry_ex->entry.flags.forwardable = 1;
1049 entry_ex->entry.flags.ok_as_delegate = 1;
1050 } else if (is_rodc) {
1051 /* The RODC krbtgt account is like the main krbtgt,
1052 * but it does not have a changepw or kadmin
1053 * service */
1054
1055 entry_ex->entry.valid_end = NULL;
1056 entry_ex->entry.pw_end = NULL;
1057
1058 /* Also don't allow the RODC krbtgt to be a client (it should not be needed) */
1059 entry_ex->entry.flags.client = 0;
1060 entry_ex->entry.flags.invalid = 0;
1061 entry_ex->entry.flags.server = 1;
1062
1063 entry_ex->entry.flags.client = 0;
1064 entry_ex->entry.flags.forwardable = 1;
1065 entry_ex->entry.flags.ok_as_delegate = 0;
1066 } else if (entry_ex->entry.flags.server && ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
1067 /* The account/password expiry only applies when the account is used as a
1068 * client (ie password login), not when used as a server */
1069
1070 /* Make very well sure we don't use this for a client,
1071 * it could bypass the password restrictions */
1072 entry_ex->entry.flags.client = 0;
1073
1074 entry_ex->entry.valid_end = NULL;
1075 entry_ex->entry.pw_end = NULL;
1076
1077 } else {
1078 NTTIME must_change_time
1079 = samdb_result_nttime(msg,
1080 "msDS-UserPasswordExpiryTimeComputed",
1081 0);
1082 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
1083 entry_ex->entry.pw_end = NULL;
1084 } else {
1085 entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
1086 if (entry_ex->entry.pw_end == NULL) {
1087 ret = ENOMEM;
1088 goto out;
1089 }
1090 *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
1091 }
1092
1093 acct_expiry = samdb_result_account_expires(msg);
1094 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
1095 entry_ex->entry.valid_end = NULL;
1096 } else {
1097 entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
1098 if (entry_ex->entry.valid_end == NULL) {
1099 ret = ENOMEM;
1100 goto out;
1101 }
1102 *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
1103 }
1104 }
1105
1106 entry_ex->entry.valid_start = NULL;
1107
1108 entry_ex->entry.max_life = malloc(sizeof(*entry_ex->entry.max_life));
1109 if (entry_ex->entry.max_life == NULL) {
1110 ret = ENOMEM;
1111 goto out;
1112 }
1113
1114 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
1115 *entry_ex->entry.max_life = kdc_db_ctx->policy.svc_tkt_lifetime;
1116 } else if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT || ent_type == SAMBA_KDC_ENT_TYPE_CLIENT) {
1117 *entry_ex->entry.max_life = kdc_db_ctx->policy.usr_tkt_lifetime;
1118 } else {
1119 *entry_ex->entry.max_life = MIN(kdc_db_ctx->policy.svc_tkt_lifetime,
1120 kdc_db_ctx->policy.usr_tkt_lifetime);
1121 }
1122
1123 entry_ex->entry.max_renew = malloc(sizeof(*entry_ex->entry.max_life));
1124 if (entry_ex->entry.max_renew == NULL) {
1125 ret = ENOMEM;
1126 goto out;
1127 }
1128
1129 *entry_ex->entry.max_renew = kdc_db_ctx->policy.renewal_lifetime;
1130
1131 /* Get keys from the db */
1132 ret = samba_kdc_message2entry_keys(context, kdc_db_ctx, p, msg,
1133 rid, is_rodc, userAccountControl,
1134 ent_type, entry_ex);
1135 if (ret) {
1136 /* Could be bogus data in the entry, or out of memory */
1137 goto out;
1138 }
1139
1140 p->msg = talloc_steal(p, msg);
1141
1142 out:
1143 if (ret != 0) {
1144 /* This doesn't free ent itself, that is for the eventual caller to do */
1145 sdb_free_entry(entry_ex);
1146 ZERO_STRUCTP(entry_ex);
1147 } else {
1148 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1149 }
1150
1151 return ret;
1152 }
1153
1154 /*
1155 * Construct an hdb_entry from a directory entry.
1156 * The kvno is what the remote client asked for
1157 */
1158 static krb5_error_code samba_kdc_trust_message2entry(krb5_context context,
1159 struct samba_kdc_db_context *kdc_db_ctx,
1160 TALLOC_CTX *mem_ctx, krb5_const_principal principal,
1161 enum trust_direction direction,
1162 struct ldb_dn *realm_dn,
1163 unsigned flags,
1164 uint32_t kvno,
1165 struct ldb_message *msg,
1166 struct sdb_entry_ex *entry_ex)
1167 {
1168 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1169 const char *our_realm = lpcfg_realm(lp_ctx);
1170 const char *dnsdomain = NULL;
1171 char *partner_realm = NULL;
1172 const char *realm = NULL;
1173 const char *krbtgt_realm = NULL;
1174 DATA_BLOB password_utf16 = data_blob_null;
1175 DATA_BLOB password_utf8 = data_blob_null;
1176 struct samr_Password _password_hash;
1177 const struct samr_Password *password_hash = NULL;
1178 const struct ldb_val *password_val;
1179 struct trustAuthInOutBlob password_blob;
1180 struct samba_kdc_entry *p;
1181 bool use_previous = false;
1182 uint32_t current_kvno;
1183 uint32_t previous_kvno;
1184 uint32_t num_keys = 0;
1185 enum ndr_err_code ndr_err;
1186 int ret, trust_direction_flags;
1187 unsigned int i;
1188 struct AuthenticationInformationArray *auth_array;
1189 struct timeval tv;
1190 NTTIME an_hour_ago;
1191 uint32_t *auth_kvno;
1192 bool preferr_current = false;
1193 uint32_t supported_enctypes = ENC_RC4_HMAC_MD5;
1194
1195 if (dsdb_functional_level(kdc_db_ctx->samdb) >= DS_DOMAIN_FUNCTION_2008) {
1196 supported_enctypes = ldb_msg_find_attr_as_uint(msg,
1197 "msDS-SupportedEncryptionTypes",
1198 supported_enctypes);
1199 }
1200
1201 trust_direction_flags = ldb_msg_find_attr_as_int(msg, "trustDirection", 0);
1202 if (!(trust_direction_flags & direction)) {
1203 krb5_clear_error_message(context);
1204 ret = SDB_ERR_NOENTRY;
1205 goto out;
1206 }
1207
1208 dnsdomain = ldb_msg_find_attr_as_string(msg, "trustPartner", NULL);
1209 if (dnsdomain == NULL) {
1210 krb5_clear_error_message(context);
1211 ret = SDB_ERR_NOENTRY;
1212 goto out;
1213 }
1214 partner_realm = strupper_talloc(mem_ctx, dnsdomain);
1215 if (partner_realm == NULL) {
1216 krb5_clear_error_message(context);
1217 ret = ENOMEM;
1218 goto out;
1219 }
1220
1221 if (direction == INBOUND) {
1222 realm = our_realm;
1223 krbtgt_realm = partner_realm;
1224
1225 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
1226 } else { /* OUTBOUND */
1227 realm = partner_realm;
1228 krbtgt_realm = our_realm;
1229
1230 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
1231 }
1232
1233 if (password_val == NULL) {
1234 krb5_clear_error_message(context);
1235 ret = SDB_ERR_NOENTRY;
1236 goto out;
1237 }
1238
1239 ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, &password_blob,
1240 (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
1241 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1242 krb5_clear_error_message(context);
1243 ret = EINVAL;
1244 goto out;
1245 }
1246
1247 p = talloc(mem_ctx, struct samba_kdc_entry);
1248 if (!p) {
1249 ret = ENOMEM;
1250 goto out;
1251 }
1252
1253 p->kdc_db_ctx = kdc_db_ctx;
1254 p->realm_dn = realm_dn;
1255
1256 talloc_set_destructor(p, samba_kdc_entry_destructor);
1257
1258 /* make sure we do not have bogus data in there */
1259 memset(&entry_ex->entry, 0, sizeof(struct sdb_entry));
1260
1261 entry_ex->ctx = p;
1262
1263 /* use 'whenCreated' */
1264 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
1265 /* use 'kadmin' for now (needed by mit_samba) */
1266 ret = smb_krb5_make_principal(context,
1267 &entry_ex->entry.created_by.principal,
1268 realm, "kadmin", NULL);
1269 if (ret) {
1270 krb5_clear_error_message(context);
1271 goto out;
1272 }
1273
1274 /*
1275 * We always need to generate the canonicalized principal
1276 * with the values of our database.
1277 */
1278 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, realm,
1279 "krbtgt", krbtgt_realm, NULL);
1280 if (ret) {
1281 krb5_clear_error_message(context);
1282 goto out;
1283 }
1284 smb_krb5_principal_set_type(context, entry_ex->entry.principal,
1285 KRB5_NT_SRV_INST);
1286
1287 entry_ex->entry.valid_start = NULL;
1288
1289 /* we need to work out if we are going to use the current or
1290 * the previous password hash.
1291 * We base this on the kvno the client passes in. If the kvno
1292 * passed in is equal to the current kvno in our database then
1293 * we use the current structure. If it is the current kvno-1,
1294 * then we use the previous substrucure.
1295 */
1296
1297 /*
1298 * Windows preferrs the previous key for one hour.
1299 */
1300 tv = timeval_current();
1301 if (tv.tv_sec > 3600) {
1302 tv.tv_sec -= 3600;
1303 }
1304 an_hour_ago = timeval_to_nttime(&tv);
1305
1306 /* first work out the current kvno */
1307 current_kvno = 0;
1308 for (i=0; i < password_blob.count; i++) {
1309 struct AuthenticationInformation *a =
1310 &password_blob.current.array[i];
1311
1312 if (a->LastUpdateTime <= an_hour_ago) {
1313 preferr_current = true;
1314 }
1315
1316 if (a->AuthType == TRUST_AUTH_TYPE_VERSION) {
1317 current_kvno = a->AuthInfo.version.version;
1318 }
1319 }
1320 if (current_kvno == 0) {
1321 previous_kvno = 255;
1322 } else {
1323 previous_kvno = current_kvno - 1;
1324 }
1325 for (i=0; i < password_blob.count; i++) {
1326 struct AuthenticationInformation *a =
1327 &password_blob.previous.array[i];
1328
1329 if (a->AuthType == TRUST_AUTH_TYPE_VERSION) {
1330 previous_kvno = a->AuthInfo.version.version;
1331 }
1332 }
1333
1334 /* work out whether we will use the previous or current
1335 password */
1336 if (password_blob.previous.count == 0) {
1337 /* there is no previous password */
1338 use_previous = false;
1339 } else if (!(flags & SDB_F_KVNO_SPECIFIED)) {
1340 /*
1341 * If not specified we use the lowest kvno
1342 * for the first hour after an update.
1343 */
1344 if (preferr_current) {
1345 use_previous = false;
1346 } else if (previous_kvno < current_kvno) {
1347 use_previous = true;
1348 } else {
1349 use_previous = false;
1350 }
1351 } else if (kvno == current_kvno) {
1352 /*
1353 * Exact match ...
1354 */
1355 use_previous = false;
1356 } else if (kvno == previous_kvno) {
1357 /*
1358 * Exact match ...
1359 */
1360 use_previous = true;
1361 } else {
1362 /*
1363 * Fallback to the current one for anything else
1364 */
1365 use_previous = false;
1366 }
1367
1368 if (use_previous) {
1369 auth_array = &password_blob.previous;
1370 auth_kvno = &previous_kvno;
1371 } else {
1372 auth_array = &password_blob.current;
1373 auth_kvno = &current_kvno;
1374 }
1375
1376 /* use the kvno the client specified, if available */
1377 if (flags & SDB_F_KVNO_SPECIFIED) {
1378 entry_ex->entry.kvno = kvno;
1379 } else {
1380 entry_ex->entry.kvno = *auth_kvno;
1381 }
1382
1383 for (i=0; i < auth_array->count; i++) {
1384 if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
1385 bool ok;
1386
1387 password_utf16 = data_blob_const(auth_array->array[i].AuthInfo.clear.password,
1388 auth_array->array[i].AuthInfo.clear.size);
1389 if (password_utf16.length == 0) {
1390 break;
1391 }
1392
1393 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1394 mdfour(_password_hash.hash, password_utf16.data, password_utf16.length);
1395 if (password_hash == NULL) {
1396 num_keys += 1;
1397 }
1398 password_hash = &_password_hash;
1399 }
1400
1401 if (!(supported_enctypes & (ENC_HMAC_SHA1_96_AES128|ENC_HMAC_SHA1_96_AES256))) {
1402 break;
1403 }
1404
1405 ok = convert_string_talloc(mem_ctx,
1406 CH_UTF16MUNGED, CH_UTF8,
1407 password_utf16.data,
1408 password_utf16.length,
1409 (void *)&password_utf8.data,
1410 &password_utf8.length);
1411 if (!ok) {
1412 krb5_clear_error_message(context);
1413 ret = ENOMEM;
1414 goto out;
1415 }
1416
1417 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1418 num_keys += 1;
1419 }
1420 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1421 num_keys += 1;
1422 }
1423 break;
1424 } else if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
1425 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1426 password_hash = &auth_array->array[i].AuthInfo.nt4owf.password;
1427 num_keys += 1;
1428 }
1429 }
1430 }
1431
1432 /* Must have found a cleartext or MD4 password */
1433 if (num_keys == 0) {
1434 DEBUG(1,(__location__ ": no usable key found\n"));
1435 krb5_clear_error_message(context);
1436 ret = SDB_ERR_NOENTRY;
1437 goto out;
1438 }
1439
1440 entry_ex->entry.keys.val = calloc(num_keys, sizeof(struct sdb_key));
1441 if (entry_ex->entry.keys.val == NULL) {
1442 krb5_clear_error_message(context);
1443 ret = ENOMEM;
1444 goto out;
1445 }
1446
1447 if (password_utf8.length != 0) {
1448 struct sdb_key key = {};
1449 krb5_const_principal salt_principal = entry_ex->entry.principal;
1450 krb5_data salt;
1451 krb5_data cleartext_data;
1452
1453 cleartext_data.data = discard_const_p(char, password_utf8.data);
1454 cleartext_data.length = password_utf8.length;
1455
1456 ret = smb_krb5_get_pw_salt(context,
1457 salt_principal,
1458 &salt);
1459 if (ret != 0) {
1460 goto out;
1461 }
1462
1463 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1464 ret = smb_krb5_create_key_from_string(context,
1465 salt_principal,
1466 &salt,
1467 &cleartext_data,
1468 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
1469 &key.key);
1470 if (ret != 0) {
1471 smb_krb5_free_data_contents(context, &salt);
1472 goto out;
1473 }
1474
1475 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1476 entry_ex->entry.keys.len++;
1477 }
1478
1479 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1480 ret = smb_krb5_create_key_from_string(context,
1481 salt_principal,
1482 &salt,
1483 &cleartext_data,
1484 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
1485 &key.key);
1486 if (ret != 0) {
1487 smb_krb5_free_data_contents(context, &salt);
1488 goto out;
1489 }
1490
1491 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1492 entry_ex->entry.keys.len++;
1493 }
1494
1495 smb_krb5_free_data_contents(context, &salt);
1496 }
1497
1498 if (password_hash != NULL) {
1499 struct sdb_key key = {};
1500
1501 ret = smb_krb5_keyblock_init_contents(context,
1502 ENCTYPE_ARCFOUR_HMAC,
1503 password_hash->hash,
1504 sizeof(password_hash->hash),
1505 &key.key);
1506 if (ret != 0) {
1507 goto out;
1508 }
1509
1510 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1511 entry_ex->entry.keys.len++;
1512 }
1513
1514 entry_ex->entry.flags = int2SDBFlags(0);
1515 entry_ex->entry.flags.immutable = 1;
1516 entry_ex->entry.flags.invalid = 0;
1517 entry_ex->entry.flags.server = 1;
1518 entry_ex->entry.flags.require_preauth = 1;
1519
1520 entry_ex->entry.pw_end = NULL;
1521
1522 entry_ex->entry.max_life = NULL;
1523
1524 entry_ex->entry.max_renew = NULL;
1525
1526 ret = samba_kdc_sort_encryption_keys(entry_ex);
1527 if (ret != 0) {
1528 krb5_clear_error_message(context);
1529 ret = ENOMEM;
1530 goto out;
1531 }
1532
1533 p->msg = talloc_steal(p, msg);
1534
1535 out:
1536 TALLOC_FREE(partner_realm);
1537
1538 if (ret != 0) {
1539 /* This doesn't free ent itself, that is for the eventual caller to do */
1540 sdb_free_entry(entry_ex);
1541 } else {
1542 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1543 }
1544
1545 return ret;
1546
1547 }
1548
1549 static krb5_error_code samba_kdc_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
1550 TALLOC_CTX *mem_ctx,
1551 const char *realm,
1552 struct ldb_dn *realm_dn,
1553 struct ldb_message **pmsg)
1554 {
1555 NTSTATUS status;
1556 const char * const *attrs = trust_attrs;
1557
1558 status = dsdb_trust_search_tdo(ldb_ctx, realm, realm,
1559 attrs, mem_ctx, pmsg);
1560 if (NT_STATUS_IS_OK(status)) {
1561 return 0;
1562 } else if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1563 return SDB_ERR_NOENTRY;
1564 } else if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1565 int ret = ENOMEM;
1566 krb5_set_error_message(context, ret, "get_sam_result_trust: out of memory");
1567 return ret;
1568 } else {
1569 int ret = EINVAL;
1570 krb5_set_error_message(context, ret, "get_sam_result_trust: %s", nt_errstr(status));
1571 return ret;
1572 }
1573 }
1574
1575 static krb5_error_code samba_kdc_lookup_client(krb5_context context,
1576 struct samba_kdc_db_context *kdc_db_ctx,
1577 TALLOC_CTX *mem_ctx,
1578 krb5_const_principal principal,
1579 const char **attrs,
1580 struct ldb_dn **realm_dn,
1581 struct ldb_message **msg)
1582 {
1583 NTSTATUS nt_status;
1584 char *principal_string = NULL;
1585
1586 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1587 principal_string = smb_krb5_principal_get_comp_string(mem_ctx, context,
1588 principal, 0);
1589 if (principal_string == NULL) {
1590 return ENOMEM;
1591 }
1592 } else {
1593 char *principal_string_m = NULL;
1594 krb5_error_code ret;
1595
1596 ret = krb5_unparse_name(context, principal, &principal_string_m);
1597 if (ret != 0) {
1598 return ret;
1599 }
1600
1601 principal_string = talloc_strdup(mem_ctx, principal_string_m);
1602 SAFE_FREE(principal_string_m);
1603 if (principal_string == NULL) {
1604 return ENOMEM;
1605 }
1606 }
1607
1608 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1609 mem_ctx, principal_string, attrs,
1610 realm_dn, msg);
1611 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1612 krb5_principal fallback_principal = NULL;
1613 unsigned int num_comp;
1614 char *fallback_realm = NULL;
1615 char *fallback_account = NULL;
1616 krb5_error_code ret;
1617
1618 ret = krb5_parse_name(context, principal_string,
1619 &fallback_principal);
1620 TALLOC_FREE(principal_string);
1621 if (ret != 0) {
1622 return ret;
1623 }
1624
1625 num_comp = krb5_princ_size(context, fallback_principal);
1626 fallback_realm = smb_krb5_principal_get_realm(context,
1627 fallback_principal);
1628 if (fallback_realm == NULL) {
1629 krb5_free_principal(context, fallback_principal);
1630 return ENOMEM;
1631 }
1632
1633 if (num_comp == 1) {
1634 size_t len;
1635
1636 fallback_account = smb_krb5_principal_get_comp_string(mem_ctx,
1637 context, fallback_principal, 0);
1638 if (fallback_account == NULL) {
1639 krb5_free_principal(context, fallback_principal);
1640 SAFE_FREE(fallback_realm);
1641 return ENOMEM;
1642 }
1643
1644 len = strlen(fallback_account);
1645 if (len >= 2 && fallback_account[len - 1] == '$') {
1646 TALLOC_FREE(fallback_account);
1647 }
1648 }
1649 krb5_free_principal(context, fallback_principal);
1650 fallback_principal = NULL;
1651
1652 if (fallback_account != NULL) {
1653 char *with_dollar;
1654
1655 with_dollar = talloc_asprintf(mem_ctx, "%s$",
1656 fallback_account);
1657 if (with_dollar == NULL) {
1658 SAFE_FREE(fallback_realm);
1659 return ENOMEM;
1660 }
1661 TALLOC_FREE(fallback_account);
1662
1663 ret = smb_krb5_make_principal(context,
1664 &fallback_principal,
1665 fallback_realm,
1666 with_dollar, NULL);
1667 TALLOC_FREE(with_dollar);
1668 if (ret != 0) {
1669 SAFE_FREE(fallback_realm);
1670 return ret;
1671 }
1672 }
1673 SAFE_FREE(fallback_realm);
1674
1675 if (fallback_principal != NULL) {
1676 char *fallback_string = NULL;
1677
1678 ret = krb5_unparse_name(context,
1679 fallback_principal,
1680 &fallback_string);
1681 if (ret != 0) {
1682 krb5_free_principal(context, fallback_principal);
1683 return ret;
1684 }
1685
1686 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1687 mem_ctx,
1688 fallback_string,
1689 attrs,
1690 realm_dn, msg);
1691 SAFE_FREE(fallback_string);
1692 }
1693 krb5_free_principal(context, fallback_principal);
1694 fallback_principal = NULL;
1695 }
1696 TALLOC_FREE(principal_string);
1697
1698 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1699 return SDB_ERR_NOENTRY;
1700 } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1701 return ENOMEM;
1702 } else if (!NT_STATUS_IS_OK(nt_status)) {
1703 return EINVAL;
1704 }
1705
1706 return 0;
1707 }
1708
1709 static krb5_error_code samba_kdc_fetch_client(krb5_context context,
1710 struct samba_kdc_db_context *kdc_db_ctx,
1711 TALLOC_CTX *mem_ctx,
1712 krb5_const_principal principal,
1713 unsigned flags,
1714 struct sdb_entry_ex *entry_ex) {
1715 struct ldb_dn *realm_dn;
1716 krb5_error_code ret;
1717 struct ldb_message *msg = NULL;
1718
1719 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1720 mem_ctx, principal, user_attrs,
1721 &realm_dn, &msg);
1722 if (ret != 0) {
1723 return ret;
1724 }
1725
1726 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1727 principal, SAMBA_KDC_ENT_TYPE_CLIENT,
1728 flags,
1729 realm_dn, msg, entry_ex);
1730 return ret;
1731 }
1732
1733 static krb5_error_code samba_kdc_fetch_krbtgt(krb5_context context,
1734 struct samba_kdc_db_context *kdc_db_ctx,
1735 TALLOC_CTX *mem_ctx,
1736 krb5_const_principal principal,
1737 unsigned flags,
1738 uint32_t kvno,
1739 struct sdb_entry_ex *entry_ex)
1740 {
1741 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1742 krb5_error_code ret;
1743 struct ldb_message *msg = NULL;
1744 struct ldb_dn *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1745 char *realm_from_princ, *realm_from_princ_malloc;
1746 char *realm_princ_comp = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 1);
1747
1748 realm_from_princ_malloc = smb_krb5_principal_get_realm(context, principal);
1749 if (realm_from_princ_malloc == NULL) {
1750 /* can't happen */
1751 return SDB_ERR_NOENTRY;
1752 }
1753 realm_from_princ = talloc_strdup(mem_ctx, realm_from_princ_malloc);
1754 free(realm_from_princ_malloc);
1755 if (realm_from_princ == NULL) {
1756 return SDB_ERR_NOENTRY;
1757 }
1758
1759 if (krb5_princ_size(context, principal) != 2
1760 || (principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME) != 0)) {
1761 /* Not a krbtgt */
1762 return SDB_ERR_NOENTRY;
1763 }
1764
1765 /* krbtgt case. Either us or a trusted realm */
1766
1767 if (lpcfg_is_my_domain_or_realm(lp_ctx, realm_from_princ)
1768 && lpcfg_is_my_domain_or_realm(lp_ctx, realm_princ_comp)) {
1769 /* us, or someone quite like us */
1770 /* Cludge, cludge cludge. If the realm part of krbtgt/realm,
1771 * is in our db, then direct the caller at our primary
1772 * krbtgt */
1773
1774 int lret;
1775 unsigned int krbtgt_number;
1776 /* w2k8r2 sometimes gives us a kvno of 255 for inter-domain
1777 trust tickets. We don't yet know what this means, but we do
1778 seem to need to treat it as unspecified */
1779 if (flags & SDB_F_KVNO_SPECIFIED) {
1780 krbtgt_number = SAMBA_KVNO_GET_KRBTGT(kvno);
1781 if (kdc_db_ctx->rodc) {
1782 if (krbtgt_number != kdc_db_ctx->my_krbtgt_number) {
1783 return SDB_ERR_NOT_FOUND_HERE;
1784 }
1785 }
1786 } else {
1787 krbtgt_number = kdc_db_ctx->my_krbtgt_number;
1788 }
1789
1790 if (krbtgt_number == kdc_db_ctx->my_krbtgt_number) {
1791 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1792 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
1793 krbtgt_attrs, DSDB_SEARCH_NO_GLOBAL_CATALOG,
1794 "(objectClass=user)");
1795 } else {
1796 /* We need to look up an RODC krbtgt (perhaps
1797 * ours, if we are an RODC, perhaps another
1798 * RODC if we are a read-write DC */
1799 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1800 &msg, realm_dn, LDB_SCOPE_SUBTREE,
1801 krbtgt_attrs,
1802 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1803 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=%u))", (unsigned)(krbtgt_number));
1804 }
1805
1806 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1807 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1808 (unsigned)(krbtgt_number));
1809 krb5_set_error_message(context, SDB_ERR_NOENTRY,
1810 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1811 (unsigned)(krbtgt_number));
1812 return SDB_ERR_NOENTRY;
1813 } else if (lret != LDB_SUCCESS) {
1814 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1815 (unsigned)(krbtgt_number));
1816 krb5_set_error_message(context, SDB_ERR_NOENTRY,
1817 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1818 (unsigned)(krbtgt_number));
1819 return SDB_ERR_NOENTRY;
1820 }
1821
1822 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1823 principal, SAMBA_KDC_ENT_TYPE_KRBTGT,
1824 flags, realm_dn, msg, entry_ex);
1825 if (ret != 0) {
1826 krb5_warnx(context, "samba_kdc_fetch: self krbtgt message2entry failed");
1827 }
1828 return ret;
1829
1830 } else {
1831 enum trust_direction direction = UNKNOWN;
1832 const char *realm = NULL;
1833
1834 /* Either an inbound or outbound trust */
1835
1836 if (strcasecmp(lpcfg_realm(lp_ctx), realm_from_princ) == 0) {
1837 /* look for inbound trust */
1838 direction = INBOUND;
1839 realm = realm_princ_comp;
1840 } else if (principal_comp_strcasecmp(context, principal, 1, lpcfg_realm(lp_ctx)) == 0) {
1841 /* look for outbound trust */
1842 direction = OUTBOUND;
1843 realm = realm_from_princ;
1844 } else {
1845 krb5_warnx(context, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1846 realm_from_princ,
1847 realm_princ_comp);
1848 krb5_set_error_message(context, SDB_ERR_NOENTRY, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1849 realm_from_princ,
1850 realm_princ_comp);
1851 return SDB_ERR_NOENTRY;
1852 }
1853
1854 /* Trusted domains are under CN=system */
1855
1856 ret = samba_kdc_lookup_trust(context, kdc_db_ctx->samdb,
1857 mem_ctx,
1858 realm, realm_dn, &msg);
1859
1860 if (ret != 0) {
1861 krb5_warnx(context, "samba_kdc_fetch: could not find principal in DB");
1862 krb5_set_error_message(context, ret, "samba_kdc_fetch: could not find principal in DB");
1863 return ret;
1864 }
1865
1866 ret = samba_kdc_trust_message2entry(context, kdc_db_ctx, mem_ctx,
1867 principal, direction,
1868 realm_dn, flags, kvno, msg, entry_ex);
1869 if (ret != 0) {
1870 krb5_warnx(context, "samba_kdc_fetch: trust_message2entry failed for %s",
1871 ldb_dn_get_linearized(msg->dn));
1872 krb5_set_error_message(context, ret, "samba_kdc_fetch: "
1873 "trust_message2entry failed for %s",
1874 ldb_dn_get_linearized(msg->dn));
1875 }
1876 return ret;
1877 }
1878
1879 }
1880
1881 static krb5_error_code samba_kdc_lookup_server(krb5_context context,
1882 struct samba_kdc_db_context *kdc_db_ctx,
1883 TALLOC_CTX *mem_ctx,
1884 krb5_const_principal principal,
1885 unsigned flags,
1886 const char **attrs,
1887 struct ldb_dn **realm_dn,
1888 struct ldb_message **msg)
1889 {
1890 krb5_error_code ret;
1891 if ((smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL)
1892 && krb5_princ_size(context, principal) >= 2) {
1893 /* 'normal server' case */
1894 int ldb_ret;
1895 NTSTATUS nt_status;
1896 struct ldb_dn *user_dn;
1897 char *principal_string;
1898
1899 ret = krb5_unparse_name_flags(context, principal,
1900 KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1901 &principal_string);
1902 if (ret != 0) {
1903 return ret;
1904 }
1905
1906 /* At this point we may find the host is known to be
1907 * in a different realm, so we should generate a
1908 * referral instead */
1909 nt_status = crack_service_principal_name(kdc_db_ctx->samdb,
1910 mem_ctx, principal_string,
1911 &user_dn, realm_dn);
1912 free(principal_string);
1913
1914 if (!NT_STATUS_IS_OK(nt_status)) {
1915 return SDB_ERR_NOENTRY;
1916 }
1917
1918 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb,
1919 mem_ctx,
1920 msg, user_dn, LDB_SCOPE_BASE,
1921 attrs,
1922 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1923 "(objectClass=*)");
1924 if (ldb_ret != LDB_SUCCESS) {
1925 return SDB_ERR_NOENTRY;
1926 }
1927 return 0;
1928 } else if (!(flags & SDB_F_FOR_AS_REQ)
1929 && smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1930 /*
1931 * The behaviour of accepting an
1932 * KRB5_NT_ENTERPRISE_PRINCIPAL server principal
1933 * containing a UPN only applies to TGS-REQ packets,
1934 * not AS-REQ packets.
1935 */
1936 return samba_kdc_lookup_client(context, kdc_db_ctx,
1937 mem_ctx, principal, attrs,
1938 realm_dn, msg);
1939 } else {
1940 /*
1941 * This case is for:
1942 * - the AS-REQ, where we only accept
1943 * samAccountName based lookups for the server, no
1944 * matter if the name is an
1945 * KRB5_NT_ENTERPRISE_PRINCIPAL or not
1946 * - for the TGS-REQ when we are not given an
1947 * KRB5_NT_ENTERPRISE_PRINCIPAL, which also must
1948 * only lookup samAccountName based names.
1949 */
1950 int lret;
1951 char *short_princ;
1952 krb5_principal enterprise_principal = NULL;
1953 krb5_const_principal used_principal = NULL;
1954 char *name1 = NULL;
1955 size_t len1 = 0;
1956 char *filter = NULL;
1957
1958 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1959 char *str = NULL;
1960 /* Need to reparse the enterprise principal to find the real target */
1961 if (krb5_princ_size(context, principal) != 1) {
1962 ret = KRB5_PARSE_MALFORMED;
1963 krb5_set_error_message(context, ret, "samba_kdc_lookup_server: request for an "
1964 "enterprise principal with wrong (%d) number of components",
1965 krb5_princ_size(context, principal));
1966 return ret;
1967 }
1968 str = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 0);
1969 if (str == NULL) {
1970 return KRB5_PARSE_MALFORMED;
1971 }
1972 ret = krb5_parse_name(context, str,
1973 &enterprise_principal);
1974 talloc_free(str);
1975 if (ret) {
1976 return ret;
1977 }
1978 used_principal = enterprise_principal;
1979 } else {
1980 used_principal = principal;
1981 }
1982
1983 /* server as client principal case, but we must not lookup userPrincipalNames */
1984 *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1985
1986 /* TODO: Check if it is our realm, otherwise give referral */
1987
1988 ret = krb5_unparse_name_flags(context, used_principal,
1989 KRB5_PRINCIPAL_UNPARSE_NO_REALM |
1990 KRB5_PRINCIPAL_UNPARSE_DISPLAY,
1991 &short_princ);
1992 used_principal = NULL;
1993 krb5_free_principal(context, enterprise_principal);
1994 enterprise_principal = NULL;
1995
1996 if (ret != 0) {
1997 krb5_set_error_message(context, ret, "samba_kdc_lookup_principal: could not parse principal");
1998 krb5_warnx(context, "samba_kdc_lookup_principal: could not parse principal");
1999 return ret;
2000 }
2001
2002 name1 = ldb_binary_encode_string(mem_ctx, short_princ);
2003 SAFE_FREE(short_princ);
2004 if (name1 == NULL) {
2005 return ENOMEM;
2006 }
2007 len1 = strlen(name1);
2008 if (len1 >= 1 && name1[len1 - 1] != '$') {
2009 filter = talloc_asprintf(mem_ctx,
2010 "(&(objectClass=user)(|(samAccountName=%s)(samAccountName=%s$)))",
2011 name1, name1);
2012 if (filter == NULL) {
2013 return ENOMEM;
2014 }
2015 } else {
2016 filter = talloc_asprintf(mem_ctx,
2017 "(&(objectClass=user)(samAccountName=%s))",
2018 name1);
2019 if (filter == NULL) {
2020 return ENOMEM;
2021 }
2022 }
2023
2024 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx, msg,
2025 *realm_dn, LDB_SCOPE_SUBTREE,
2026 attrs,
2027 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
2028 "%s", filter);
2029 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
2030 DEBUG(10, ("Failed to find an entry for %s filter:%s\n",
2031 name1, filter));
2032 return SDB_ERR_NOENTRY;
2033 }
2034 if (lret == LDB_ERR_CONSTRAINT_VIOLATION) {
2035 DEBUG(10, ("Failed to find unique entry for %s filter:%s\n",
2036 name1, filter));
2037 return SDB_ERR_NOENTRY;
2038 }
2039 if (lret != LDB_SUCCESS) {
2040 DEBUG(0, ("Failed single search for %s - %s\n",
2041 name1, ldb_errstring(kdc_db_ctx->samdb)));
2042 return SDB_ERR_NOENTRY;
2043 }
2044 return 0;
2045 }
2046 return SDB_ERR_NOENTRY;
2047 }
2048
2049
2050
2051 static krb5_error_code samba_kdc_fetch_server(krb5_context context,
2052 struct samba_kdc_db_context *kdc_db_ctx,
2053 TALLOC_CTX *mem_ctx,
2054 krb5_const_principal principal,
2055 unsigned flags,
2056 struct sdb_entry_ex *entry_ex)
2057 {
2058 krb5_error_code ret;
2059 struct ldb_dn *realm_dn;
2060 struct ldb_message *msg;
2061
2062 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, principal,
2063 flags, server_attrs, &realm_dn, &msg);
2064 if (ret != 0) {
2065 return ret;
2066 }
2067
2068 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
2069 principal, SAMBA_KDC_ENT_TYPE_SERVER,
2070 flags,
2071 realm_dn, msg, entry_ex);
2072 if (ret != 0) {
2073 krb5_warnx(context, "samba_kdc_fetch: message2entry failed");
2074 }
2075
2076 return ret;
2077 }
2078
2079 static krb5_error_code samba_kdc_lookup_realm(krb5_context context,
2080 struct samba_kdc_db_context *kdc_db_ctx,
2081 TALLOC_CTX *mem_ctx,
2082 krb5_const_principal principal,
2083 unsigned flags,
2084 struct sdb_entry_ex *entry_ex)
2085 {
2086 TALLOC_CTX *frame = talloc_stackframe();
2087 NTSTATUS status;
2088 krb5_error_code ret;
2089 char *_realm = NULL;
2090 bool check_realm = false;
2091 const char *realm = NULL;
2092 struct dsdb_trust_routing_table *trt = NULL;
2093 const struct lsa_TrustDomainInfoInfoEx *tdo = NULL;
2094 unsigned int num_comp;
2095 bool ok;
2096 char *upper = NULL;
2097
2098 num_comp = krb5_princ_size(context, principal);
2099
2100 if (flags & SDB_F_GET_CLIENT) {
2101 if (flags & SDB_F_FOR_AS_REQ) {
2102 check_realm = true;
2103 }
2104 }
2105 if (flags & SDB_F_GET_SERVER) {
2106 if (flags & SDB_F_FOR_TGS_REQ) {
2107 check_realm = true;
2108 }
2109 }
2110
2111 if (!check_realm) {
2112 TALLOC_FREE(frame);
2113 return 0;
2114 }
2115
2116 _realm = smb_krb5_principal_get_realm(context, principal);
2117 if (_realm == NULL) {
2118 TALLOC_FREE(frame);
2119 return ENOMEM;
2120 }
2121
2122 /*
2123 * The requested realm needs to be our own
2124 */
2125 ok = lpcfg_is_my_domain_or_realm(kdc_db_ctx->lp_ctx, _realm);
2126 if (!ok) {
2127 /*
2128 * The request is not for us...
2129 */
2130 SAFE_FREE(_realm);
2131 TALLOC_FREE(frame);
2132 return SDB_ERR_NOENTRY;
2133 }
2134
2135 realm = talloc_strdup(frame, _realm);
2136 SAFE_FREE(_realm);
2137 if (realm == NULL) {
2138 TALLOC_FREE(frame);
2139 return ENOMEM;
2140 }
2141
2142 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
2143 char *principal_string = NULL;
2144 krb5_principal enterprise_principal = NULL;
2145 char *enterprise_realm = NULL;
2146
2147 if (num_comp != 1) {
2148 TALLOC_FREE(frame);
2149 return SDB_ERR_NOENTRY;
2150 }
2151
2152 principal_string = smb_krb5_principal_get_comp_string(frame, context,
2153 principal, 0);
2154 if (principal_string == NULL) {
2155 TALLOC_FREE(frame);
2156 return ENOMEM;
2157 }
2158
2159 ret = krb5_parse_name(context, principal_string,
2160 &enterprise_principal);
2161 TALLOC_FREE(principal_string);
2162 if (ret) {
2163 TALLOC_FREE(frame);
2164 return ret;
2165 }
2166
2167 enterprise_realm = smb_krb5_principal_get_realm(context,
2168 enterprise_principal);
2169 krb5_free_principal(context, enterprise_principal);
2170 if (enterprise_realm != NULL) {
2171 realm = talloc_strdup(frame, enterprise_realm);
2172 SAFE_FREE(enterprise_realm);
2173 if (realm == NULL) {
2174 TALLOC_FREE(frame);
2175 return ENOMEM;
2176 }
2177 }
2178 }
2179
2180 if (flags & SDB_F_GET_SERVER) {
2181 char *service_realm = NULL;
2182
2183 ret = principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME);
2184 if (ret == 0) {
2185 /*
2186 * we need to search krbtgt/ locally
2187 */
2188 TALLOC_FREE(frame);
2189 return 0;
2190 }
2191
2192 /*
2193 * We need to check the last component against the routing table.
2194 *
2195 * Note this works only with 2 or 3 component principals, e.g:
2196 *
2197 * servicePrincipalName: ldap/W2K8R2-219.bla.base
2198 * servicePrincipalName: ldap/W2K8R2-219.bla.base/bla.base
2199 * servicePrincipalName: ldap/W2K8R2-219.bla.base/ForestDnsZones.bla.base
2200 * servicePrincipalName: ldap/W2K8R2-219.bla.base/DomainDnsZones.bla.base
2201 */
2202
2203 if (num_comp == 2 || num_comp == 3) {
2204 service_realm = smb_krb5_principal_get_comp_string(frame,
2205 context,
2206 principal,
2207 num_comp - 1);
2208 }
2209
2210 if (service_realm != NULL) {
2211 realm = service_realm;
2212 }
2213 }
2214
2215 ok = lpcfg_is_my_domain_or_realm(kdc_db_ctx->lp_ctx, realm);
2216 if (ok) {
2217 /*
2218 * skip the expensive routing lookup
2219 */
2220 TALLOC_FREE(frame);
2221 return 0;
2222 }
2223
2224 status = dsdb_trust_routing_table_load(kdc_db_ctx->samdb,
2225 frame, &trt);
2226 if (!NT_STATUS_IS_OK(status)) {
2227 TALLOC_FREE(frame);
2228 return EINVAL;
2229 }
2230
2231 tdo = dsdb_trust_routing_by_name(trt, realm);
2232 if (tdo == NULL) {
2233 /*
2234 * This principal has to be local
2235 */
2236 TALLOC_FREE(frame);
2237 return 0;
2238 }
2239
2240 if (tdo->trust_attributes & LSA_TRUST_ATTRIBUTE_WITHIN_FOREST) {
2241 /*
2242 * TODO: handle the routing within the forest
2243 *
2244 * This should likely be handled in
2245 * samba_kdc_message2entry() in case we're
2246 * a global catalog. We'd need to check
2247 * if realm_dn is our own domain and derive
2248 * the dns domain name from realm_dn and check that
2249 * against the routing table or fallback to
2250 * the tdo we found here.
2251 *
2252 * But for now we don't support multiple domains
2253 * in our forest correctly anyway.
2254 *
2255 * Just search in our local database.
2256 */
2257 TALLOC_FREE(frame);
2258 return 0;
2259 }
2260
2261 ZERO_STRUCT(entry_ex->entry);
2262
2263 ret = krb5_copy_principal(context, principal,
2264 &entry_ex->entry.principal);
2265 if (ret) {
2266 TALLOC_FREE(frame);
2267 return ret;
2268 }
2269
2270 upper = strupper_talloc(frame, tdo->domain_name.string);
2271 if (upper == NULL) {
2272 TALLOC_FREE(frame);
2273 return ENOMEM;
2274 }
2275
2276 ret = smb_krb5_principal_set_realm(context,
2277 entry_ex->entry.principal,
2278 upper);
2279 if (ret) {
2280 TALLOC_FREE(frame);
2281 return ret;
2282 }
2283
2284 TALLOC_FREE(frame);
2285 return SDB_ERR_WRONG_REALM;
2286 }
2287
2288 krb5_error_code samba_kdc_fetch(krb5_context context,
2289 struct samba_kdc_db_context *kdc_db_ctx,
2290 krb5_const_principal principal,
2291 unsigned flags,
2292 krb5_kvno kvno,
2293 struct sdb_entry_ex *entry_ex)
2294 {
2295 krb5_error_code ret = SDB_ERR_NOENTRY;
2296 TALLOC_CTX *mem_ctx;
2297
2298 mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_fetch context");
2299 if (!mem_ctx) {
2300 ret = ENOMEM;
2301 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2302 return ret;
2303 }
2304
2305 ret = samba_kdc_lookup_realm(context, kdc_db_ctx, mem_ctx,
2306 principal, flags, entry_ex);
2307 if (ret != 0) {
2308 goto done;
2309 }
2310
2311 ret = SDB_ERR_NOENTRY;
2312
2313 if (flags & SDB_F_GET_CLIENT) {
2314 ret = samba_kdc_fetch_client(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
2315 if (ret != SDB_ERR_NOENTRY) goto done;
2316 }
2317 if (flags & SDB_F_GET_SERVER) {
2318 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
2319 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
2320 if (ret != SDB_ERR_NOENTRY) goto done;
2321
2322 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
2323 ret = samba_kdc_fetch_server(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
2324 if (ret != SDB_ERR_NOENTRY) goto done;
2325 }
2326 if (flags & SDB_F_GET_KRBTGT) {
2327 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
2328 if (ret != SDB_ERR_NOENTRY) goto done;
2329 }
2330
2331 done:
2332 talloc_free(mem_ctx);
2333 return ret;
2334 }
2335
2336 struct samba_kdc_seq {
2337 unsigned int index;
2338 unsigned int count;
2339 struct ldb_message **msgs;
2340 struct ldb_dn *realm_dn;
2341 };
2342
2343 static krb5_error_code samba_kdc_seq(krb5_context context,
2344 struct samba_kdc_db_context *kdc_db_ctx,
2345 struct sdb_entry_ex *entry)
2346 {
2347 krb5_error_code ret;
2348 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
2349 const char *realm = lpcfg_realm(kdc_db_ctx->lp_ctx);
2350 struct ldb_message *msg = NULL;
2351 const char *sAMAccountName = NULL;
2352 krb5_principal principal = NULL;
2353 TALLOC_CTX *mem_ctx;
2354
2355 if (!priv) {
2356 return SDB_ERR_NOENTRY;
2357 }
2358
2359 mem_ctx = talloc_named(priv, 0, "samba_kdc_seq context");
2360
2361 if (!mem_ctx) {
2362 ret = ENOMEM;
2363 krb5_set_error_message(context, ret, "samba_kdc_seq: talloc_named() failed!");
2364 return ret;
2365 }
2366
2367 while (priv->index < priv->count) {
2368 msg = priv->msgs[priv->index++];
2369
2370 sAMAccountName = ldb_msg_find_attr_as_string(msg, "sAMAccountName", NULL);
2371 if (sAMAccountName != NULL) {
2372 break;
2373 }
2374 }
2375
2376 if (sAMAccountName == NULL) {
2377 ret = SDB_ERR_NOENTRY;
2378 goto out;
2379 }
2380
2381 ret = smb_krb5_make_principal(context, &principal,
2382 realm, sAMAccountName, NULL);
2383 if (ret != 0) {
2384 goto out;
2385 }
2386
2387 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
2388 principal, SAMBA_KDC_ENT_TYPE_ANY,
2389 SDB_F_ADMIN_DATA|SDB_F_GET_ANY,
2390 priv->realm_dn, msg, entry);
2391
2392 out:
2393 if (principal != NULL) {
2394 krb5_free_principal(context, principal);
2395 }
2396
2397 if (ret != 0) {
2398 TALLOC_FREE(priv);
2399 kdc_db_ctx->seq_ctx = NULL;
2400 } else {
2401 talloc_free(mem_ctx);
2402 }
2403
2404 return ret;
2405 }
2406
2407 krb5_error_code samba_kdc_firstkey(krb5_context context,
2408 struct samba_kdc_db_context *kdc_db_ctx,
2409 struct sdb_entry_ex *entry)
2410 {
2411 struct ldb_context *ldb_ctx = kdc_db_ctx->samdb;
2412 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
2413 char *realm;
2414 struct ldb_result *res = NULL;
2415 krb5_error_code ret;
2416 TALLOC_CTX *mem_ctx;
2417 int lret;
2418
2419 if (priv) {
2420 TALLOC_FREE(priv);
2421 kdc_db_ctx->seq_ctx = NULL;
2422 }
2423
2424 priv = (struct samba_kdc_seq *) talloc(kdc_db_ctx, struct samba_kdc_seq);
2425 if (!priv) {
2426 ret = ENOMEM;
2427 krb5_set_error_message(context, ret, "talloc: out of memory");
2428 return ret;
2429 }
2430
2431 priv->index = 0;
2432 priv->msgs = NULL;
2433 priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
2434 priv->count = 0;
2435
2436 mem_ctx = talloc_named(priv, 0, "samba_kdc_firstkey context");
2437
2438 if (!mem_ctx) {
2439 ret = ENOMEM;
2440 krb5_set_error_message(context, ret, "samba_kdc_firstkey: talloc_named() failed!");
2441 return ret;
2442 }
2443
2444 ret = krb5_get_default_realm(context, &realm);
2445 if (ret != 0) {
2446 TALLOC_FREE(priv);
2447 return ret;
2448 }
2449 krb5_free_default_realm(context, realm);
2450
2451 lret = dsdb_search(ldb_ctx, priv, &res,
2452 priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
2453 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2454 "(objectClass=user)");
2455
2456 if (lret != LDB_SUCCESS) {
2457 TALLOC_FREE(priv);
2458 return SDB_ERR_NOENTRY;
2459 }
2460
2461 priv->count = res->count;
2462 priv->msgs = talloc_steal(priv, res->msgs);
2463 talloc_free(res);
2464
2465 kdc_db_ctx->seq_ctx = priv;
2466
2467 ret = samba_kdc_seq(context, kdc_db_ctx, entry);
2468
2469 if (ret != 0) {
2470 TALLOC_FREE(priv);
2471 kdc_db_ctx->seq_ctx = NULL;
2472 } else {
2473 talloc_free(mem_ctx);
2474 }
2475 return ret;
2476 }
2477
2478 krb5_error_code samba_kdc_nextkey(krb5_context context,
2479 struct samba_kdc_db_context *kdc_db_ctx,
2480 struct sdb_entry_ex *entry)
2481 {
2482 return samba_kdc_seq(context, kdc_db_ctx, entry);
2483 }
2484
2485 /* Check if a given entry may delegate or do s4u2self to this target principal
2486 *
2487 * This is currently a very nasty hack - allowing only delegation to itself.
2488 */
2489 krb5_error_code
2490 samba_kdc_check_s4u2self(krb5_context context,
2491 struct samba_kdc_db_context *kdc_db_ctx,
2492 struct samba_kdc_entry *skdc_entry,
2493 krb5_const_principal target_principal)
2494 {
2495 krb5_error_code ret;
2496 struct ldb_dn *realm_dn;
2497 struct ldb_message *msg;
2498 struct dom_sid *orig_sid;
2499 struct dom_sid *target_sid;
2500 const char *delegation_check_attrs[] = {
2501 "objectSid", NULL
2502 };
2503
2504 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2self");
2505
2506 if (!mem_ctx) {
2507 ret = ENOMEM;
2508 krb5_set_error_message(context, ret, "samba_kdc_check_s4u2self: talloc_named() failed!");
2509 return ret;
2510 }
2511
2512 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, target_principal,
2513 SDB_F_GET_CLIENT|SDB_F_GET_SERVER,
2514 delegation_check_attrs, &realm_dn, &msg);
2515
2516 if (ret != 0) {
2517 talloc_free(mem_ctx);
2518 return ret;
2519 }
2520
2521 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2522 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2523
2524 /* Allow delegation to the same principal, even if by a different
2525 * name. The easy and safe way to prove this is by SID
2526 * comparison */
2527 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2528 talloc_free(mem_ctx);
2529 return KRB5KDC_ERR_BADOPTION;
2530 }
2531
2532 talloc_free(mem_ctx);
2533 return ret;
2534 }
2535
2536 /* Certificates printed by a the Certificate Authority might have a
2537 * slightly different form of the user principal name to that in the
2538 * database. Allow a mismatch where they both refer to the same
2539 * SID */
2540
2541 krb5_error_code
2542 samba_kdc_check_pkinit_ms_upn_match(krb5_context context,
2543 struct samba_kdc_db_context *kdc_db_ctx,
2544 struct samba_kdc_entry *skdc_entry,
2545 krb5_const_principal certificate_principal)
2546 {
2547 krb5_error_code ret;
2548 struct ldb_dn *realm_dn;
2549 struct ldb_message *msg;
2550 struct dom_sid *orig_sid;
2551 struct dom_sid *target_sid;
2552 const char *ms_upn_check_attrs[] = {
2553 "objectSid", NULL
2554 };
2555
2556 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_pkinit_ms_upn_match");
2557
2558 if (!mem_ctx) {
2559 ret = ENOMEM;
2560 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2561 return ret;
2562 }
2563
2564 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
2565 mem_ctx, certificate_principal,
2566 ms_upn_check_attrs, &realm_dn, &msg);
2567
2568 if (ret != 0) {
2569 talloc_free(mem_ctx);
2570 return ret;
2571 }
2572
2573 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2574 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2575
2576 /* Consider these to be the same principal, even if by a different
2577 * name. The easy and safe way to prove this is by SID
2578 * comparison */
2579 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2580 talloc_free(mem_ctx);
2581 #ifdef KRB5_KDC_ERR_CLIENT_NAME_MISMATCH /* Heimdal */
2582 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
2583 #elif defined(KRB5KDC_ERR_CLIENT_NAME_MISMATCH) /* MIT */
2584 return KRB5KDC_ERR_CLIENT_NAME_MISMATCH;
2585 #endif
2586 }
2587
2588 talloc_free(mem_ctx);
2589 return ret;
2590 }
2591
2592 /*
2593 * Check if a given entry may delegate to this target principal
2594 * with S4U2Proxy.
2595 */
2596 krb5_error_code
2597 samba_kdc_check_s4u2proxy(krb5_context context,
2598 struct samba_kdc_db_context *kdc_db_ctx,
2599 struct samba_kdc_entry *skdc_entry,
2600 krb5_const_principal target_principal)
2601 {
2602 krb5_error_code ret;
2603 char *tmp = NULL;
2604 const char *client_dn = NULL;
2605 const char *target_principal_name = NULL;
2606 struct ldb_message_element *el;
2607 struct ldb_val val;
2608 unsigned int i;
2609 bool found = false;
2610
2611 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2proxy");
2612
2613 if (!mem_ctx) {
2614 ret = ENOMEM;
2615 krb5_set_error_message(context, ret,
2616 "samba_kdc_check_s4u2proxy:"
2617 " talloc_named() failed!");
2618 return ret;
2619 }
2620
2621 client_dn = ldb_dn_get_linearized(skdc_entry->msg->dn);
2622 if (!client_dn) {
2623 if (errno == 0) {
2624 errno = ENOMEM;
2625 }
2626 ret = errno;
2627 krb5_set_error_message(context, ret,
2628 "samba_kdc_check_s4u2proxy:"
2629 " ldb_dn_get_linearized() failed!");
2630 return ret;
2631 }
2632
2633 /*
2634 * The main heimdal code already checked that the target_principal
2635 * belongs to the same realm as the client.
2636 *
2637 * So we just need the principal without the realm,
2638 * as that is what is configured in the "msDS-AllowedToDelegateTo"
2639 * attribute.
2640 */
2641 ret = krb5_unparse_name_flags(context, target_principal,
2642 KRB5_PRINCIPAL_UNPARSE_NO_REALM, &tmp);
2643 if (ret) {
2644 talloc_free(mem_ctx);
2645 krb5_set_error_message(context, ret,
2646 "samba_kdc_check_s4u2proxy:"
2647 " krb5_unparse_name() failed!");
2648 return ret;
2649 }
2650 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] for target[%s]\n",
2651 client_dn, tmp));
2652
2653 target_principal_name = talloc_strdup(mem_ctx, tmp);
2654 SAFE_FREE(tmp);
2655 if (target_principal_name == NULL) {
2656 ret = ENOMEM;
2657 krb5_set_error_message(context, ret,
2658 "samba_kdc_check_s4u2proxy:"
2659 " talloc_strdup() failed!");
2660 return ret;
2661 }
2662
2663 el = ldb_msg_find_element(skdc_entry->msg, "msDS-AllowedToDelegateTo");
2664 if (el == NULL) {
2665 goto bad_option;
2666 }
2667
2668 val = data_blob_string_const(target_principal_name);
2669
2670 for (i=0; i<el->num_values; i++) {
2671 struct ldb_val *val1 = &val;
2672 struct ldb_val *val2 = &el->values[i];
2673 int cmp;
2674
2675 if (val1->length != val2->length) {
2676 continue;
2677 }
2678
2679 cmp = strncasecmp((const char *)val1->data,
2680 (const char *)val2->data,
2681 val1->length);
2682 if (cmp != 0) {
2683 continue;
2684 }
2685
2686 found = true;
2687 break;
2688 }
2689
2690 if (!found) {
2691 goto bad_option;
2692 }
2693
2694 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] allowed target[%s]\n",
2695 client_dn, tmp));
2696 talloc_free(mem_ctx);
2697 return 0;
2698
2699 bad_option:
2700 krb5_set_error_message(context, ret,
2701 "samba_kdc_check_s4u2proxy: client[%s] "
2702 "not allowed for delegation to target[%s]",
2703 client_dn,
2704 target_principal_name);
2705 talloc_free(mem_ctx);
2706 return KRB5KDC_ERR_BADOPTION;
2707 }
2708
2709 NTSTATUS samba_kdc_setup_db_ctx(TALLOC_CTX *mem_ctx, struct samba_kdc_base_context *base_ctx,
2710 struct samba_kdc_db_context **kdc_db_ctx_out)
2711 {
2712 int ldb_ret;
2713 struct ldb_message *msg;
2714 struct auth_session_info *session_info;
2715 struct samba_kdc_db_context *kdc_db_ctx;
2716 /* The idea here is very simple. Using Kerberos to
2717 * authenticate the KDC to the LDAP server is higly likely to
2718 * be circular.
2719 *
2720 * In future we may set this up to use EXERNAL and SSL
2721 * certificates, for now it will almost certainly be NTLMSSP_SET_USERNAME
2722 */
2723
2724 kdc_db_ctx = talloc_zero(mem_ctx, struct samba_kdc_db_context);
2725 if (kdc_db_ctx == NULL) {
2726 return NT_STATUS_NO_MEMORY;
2727 }
2728 kdc_db_ctx->ev_ctx = base_ctx->ev_ctx;
2729 kdc_db_ctx->lp_ctx = base_ctx->lp_ctx;
2730 kdc_db_ctx->msg_ctx = base_ctx->msg_ctx;
2731
2732 /* get default kdc policy */
2733 lpcfg_default_kdc_policy(base_ctx->lp_ctx,
2734 &kdc_db_ctx->policy.svc_tkt_lifetime,
2735 &kdc_db_ctx->policy.usr_tkt_lifetime,
2736 &kdc_db_ctx->policy.renewal_lifetime);
2737
2738 session_info = system_session(kdc_db_ctx->lp_ctx);
2739 if (session_info == NULL) {
2740 return NT_STATUS_INTERNAL_ERROR;
2741 }
2742
2743 /* Setup the link to LDB */
2744 kdc_db_ctx->samdb = samdb_connect(kdc_db_ctx, base_ctx->ev_ctx,
2745 base_ctx->lp_ctx, session_info, 0);
2746 if (kdc_db_ctx->samdb == NULL) {
2747 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot open samdb for KDC backend!"));
2748 talloc_free(kdc_db_ctx);
2749 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2750 }
2751
2752 /* Find out our own krbtgt kvno */
2753 ldb_ret = samdb_rodc(kdc_db_ctx->samdb, &kdc_db_ctx->rodc);
2754 if (ldb_ret != LDB_SUCCESS) {
2755 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine if we are an RODC in KDC backend: %s\n",
2756 ldb_errstring(kdc_db_ctx->samdb)));
2757 talloc_free(kdc_db_ctx);
2758 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2759 }
2760 if (kdc_db_ctx->rodc) {
2761 int my_krbtgt_number;
2762 const char *secondary_keytab[] = { "msDS-SecondaryKrbTgtNumber", NULL };
2763 struct ldb_dn *account_dn;
2764 struct ldb_dn *server_dn = samdb_server_dn(kdc_db_ctx->samdb, kdc_db_ctx);
2765 if (!server_dn) {
2766 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server DN in KDC backend: %s\n",
2767 ldb_errstring(kdc_db_ctx->samdb)));
2768 talloc_free(kdc_db_ctx);
2769 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2770 }
2771
2772 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, server_dn,
2773 "serverReference", &account_dn);
2774 if (ldb_ret != LDB_SUCCESS) {
2775 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server account in KDC backend: %s\n",
2776 ldb_errstring(kdc_db_ctx->samdb)));
2777 talloc_free(kdc_db_ctx);
2778 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2779 }
2780
2781 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, account_dn,
2782 "msDS-KrbTgtLink", &kdc_db_ctx->krbtgt_dn);
2783 talloc_free(account_dn);
2784 if (ldb_ret != LDB_SUCCESS) {
2785 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine RODC krbtgt account in KDC backend: %s\n",
2786 ldb_errstring(kdc_db_ctx->samdb)));
2787 talloc_free(kdc_db_ctx);
2788 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2789 }
2790
2791 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2792 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
2793 secondary_keytab,
2794 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2795 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=*))");
2796 if (ldb_ret != LDB_SUCCESS) {
2797 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read krbtgt account %s in KDC backend to get msDS-SecondaryKrbTgtNumber: %s: %s\n",
2798 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2799 ldb_errstring(kdc_db_ctx->samdb),
2800 ldb_strerror(ldb_ret)));
2801 talloc_free(kdc_db_ctx);
2802 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2803 }
2804 my_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
2805 if (my_krbtgt_number == -1) {
2806 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read msDS-SecondaryKrbTgtNumber from krbtgt account %s in KDC backend: got %d\n",
2807 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2808 my_krbtgt_number));
2809 talloc_free(kdc_db_ctx);
2810 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2811 }
2812 kdc_db_ctx->my_krbtgt_number = my_krbtgt_number;
2813
2814 } else {
2815 kdc_db_ctx->my_krbtgt_number = 0;
2816 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2817 &msg,
2818 ldb_get_default_basedn(kdc_db_ctx->samdb),
2819 LDB_SCOPE_SUBTREE,
2820 krbtgt_attrs,
2821 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2822 "(&(objectClass=user)(samAccountName=krbtgt))");
2823
2824 if (ldb_ret != LDB_SUCCESS) {
2825 DEBUG(1, ("samba_kdc_fetch: could not find own KRBTGT in DB: %s\n", ldb_errstring(kdc_db_ctx->samdb)));
2826 talloc_free(kdc_db_ctx);
2827 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2828 }
2829 kdc_db_ctx->krbtgt_dn = talloc_steal(kdc_db_ctx, msg->dn);
2830 kdc_db_ctx->my_krbtgt_number = 0;
2831 talloc_free(msg);
2832 }
2833 *kdc_db_ctx_out = kdc_db_ctx;
2834 return NT_STATUS_OK;
2835 }
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