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smbtorture: Close unused pipe fds in kernel_oplocks8
[Samba.git] / source4 / kdc / db-glue.c
blobacd24ec0c83729f1b81f7a06adb475ac94e549ca
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 "securityIdentifier",
61 "flatName",
62 "trustPartner",
63 "trustAttributes",
64 "trustDirection",
65 "trustType",
66 "msDS-TrustForestTrustInfo",
67 "trustAuthIncoming",
68 "trustAuthOutgoing",
69 "whenCreated",
70 "msDS-SupportedEncryptionTypes",
71 NULL
72 };
73
74 /*
75 send a message to the drepl server telling it to initiate a
76 REPL_SECRET getncchanges extended op to fetch the users secrets
77 */
78 static void auth_sam_trigger_repl_secret(TALLOC_CTX *mem_ctx,
79 struct imessaging_context *msg_ctx,
80 struct tevent_context *event_ctx,
81 struct ldb_dn *user_dn)
82 {
83 struct dcerpc_binding_handle *irpc_handle;
84 struct drepl_trigger_repl_secret r;
85 struct tevent_req *req;
86 TALLOC_CTX *tmp_ctx;
87
88 tmp_ctx = talloc_new(mem_ctx);
89 if (tmp_ctx == NULL) {
90 return;
91 }
92
93 irpc_handle = irpc_binding_handle_by_name(tmp_ctx, msg_ctx,
94 "dreplsrv",
95 &ndr_table_irpc);
96 if (irpc_handle == NULL) {
97 DEBUG(1,(__location__ ": Unable to get binding handle for dreplsrv\n"));
98 TALLOC_FREE(tmp_ctx);
99 return;
100 }
101
102 r.in.user_dn = ldb_dn_get_linearized(user_dn);
103
104 /*
105 * This seem to rely on the current IRPC implementation,
106 * which delivers the message in the _send function.
107 *
108 * TODO: we need a ONE_WAY IRPC handle and register
109 * a callback and wait for it to be triggered!
110 */
111 req = dcerpc_drepl_trigger_repl_secret_r_send(tmp_ctx,
112 event_ctx,
113 irpc_handle,
114 &r);
115
116 /* we aren't interested in a reply */
117 talloc_free(req);
118 TALLOC_FREE(tmp_ctx);
119 }
120
121 static time_t ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, time_t default_val)
122 {
123 const char *tmp;
124 const char *gentime;
125 struct tm tm;
126
127 gentime = ldb_msg_find_attr_as_string(msg, attr, NULL);
128 if (!gentime)
129 return default_val;
130
131 tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
132 if (tmp == NULL) {
133 return default_val;
134 }
135
136 return timegm(&tm);
137 }
138
139 static struct SDBFlags uf2SDBFlags(krb5_context context, uint32_t userAccountControl, enum samba_kdc_ent_type ent_type)
140 {
141 struct SDBFlags flags = int2SDBFlags(0);
142
143 /* we don't allow kadmin deletes */
144 flags.immutable = 1;
145
146 /* mark the principal as invalid to start with */
147 flags.invalid = 1;
148
149 flags.renewable = 1;
150
151 /* All accounts are servers, but this may be disabled again in the caller */
152 flags.server = 1;
153
154 /* Account types - clear the invalid bit if it turns out to be valid */
155 if (userAccountControl & UF_NORMAL_ACCOUNT) {
156 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
157 flags.client = 1;
158 }
159 flags.invalid = 0;
160 }
161
162 if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
163 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
164 flags.client = 1;
165 }
166 flags.invalid = 0;
167 }
168 if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
169 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
170 flags.client = 1;
171 }
172 flags.invalid = 0;
173 }
174 if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
175 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
176 flags.client = 1;
177 }
178 flags.invalid = 0;
179 }
180
181 /* Not permitted to act as a client if disabled */
182 if (userAccountControl & UF_ACCOUNTDISABLE) {
183 flags.client = 0;
184 }
185 if (userAccountControl & UF_LOCKOUT) {
186 flags.locked_out = 1;
187 }
188 /*
189 if (userAccountControl & UF_PASSWORD_NOTREQD) {
190 flags.invalid = 1;
191 }
192 */
193 /*
194 UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent
195 */
196 if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
197 flags.invalid = 1;
198 }
199
200 /* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in samba_kdc_message2entry() */
201
202 /*
203 if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
204 flags.invalid = 1;
205 }
206 */
207 if (userAccountControl & UF_SMARTCARD_REQUIRED) {
208 flags.require_hwauth = 1;
209 }
210 if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
211 flags.ok_as_delegate = 1;
212 }
213 if (userAccountControl & UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION) {
214 /*
215 * this is confusing...
216 *
217 * UF_TRUSTED_FOR_DELEGATION
218 * => ok_as_delegate
219 *
220 * and
221 *
222 * UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION
223 * => trusted_for_delegation
224 */
225 flags.trusted_for_delegation = 1;
226 }
227 if (!(userAccountControl & UF_NOT_DELEGATED)) {
228 flags.forwardable = 1;
229 flags.proxiable = 1;
230 }
231
232 if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
233 flags.require_preauth = 0;
234 } else {
235 flags.require_preauth = 1;
236
237 }
238 return flags;
239 }
240
241 static int samba_kdc_entry_destructor(struct samba_kdc_entry *p)
242 {
243 if (p->entry_ex != NULL) {
244 struct sdb_entry_ex *entry_ex = p->entry_ex;
245 free_sdb_entry(&entry_ex->entry);
246 }
247
248 return 0;
249 }
250
251 /*
252 * Sort keys in descending order of strength.
253 *
254 * Explanaton from Greg Hudson:
255 *
256 * To encrypt tickets only the first returned key is used by the MIT KDC. The
257 * other keys just communicate support for session key enctypes, and aren't
258 * really used. The encryption key for the ticket enc part doesn't have
259 * to be of a type requested by the client. The session key enctype is chosen
260 * based on the client preference order, limited by the set of enctypes present
261 * in the server keys (unless the string attribute is set on the server
262 * principal overriding that set).
263 */
264 static int samba_kdc_sort_encryption_keys(struct sdb_entry_ex *entry_ex)
265 {
266 unsigned int i, j, idx = 0;
267 static const krb5_enctype etype_list[] = {
268 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
269 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
270 ENCTYPE_DES3_CBC_SHA1,
271 ENCTYPE_ARCFOUR_HMAC,
272 ENCTYPE_DES_CBC_MD5,
273 ENCTYPE_DES_CBC_MD4,
274 ENCTYPE_DES_CBC_CRC,
275 ENCTYPE_NULL
276 };
277 size_t etype_len = ARRAY_SIZE(etype_list);
278 size_t keys_size = entry_ex->entry.keys.len;
279 struct sdb_key *keys = entry_ex->entry.keys.val;
280 struct sdb_key *sorted_keys;
281
282 sorted_keys = calloc(keys_size, sizeof(struct sdb_key));
283 if (sorted_keys == NULL) {
284 return -1;
285 }
286
287 for (i = 0; i < etype_len; i++) {
288 for (j = 0; j < keys_size; j++) {
289 const struct sdb_key skey = keys[j];
290
291 if (idx == keys_size) {
292 break;
293 }
294
295 if (KRB5_KEY_TYPE(&skey.key) == etype_list[i]) {
296 sorted_keys[idx] = skey;
297 idx++;
298 }
299 }
300 }
301
302 /* Paranoia: Something went wrong during data copy */
303 if (idx != keys_size) {
304 free(sorted_keys);
305 return -1;
306 }
307
308 free(entry_ex->entry.keys.val);
309 entry_ex->entry.keys.val = sorted_keys;
310
311 return 0;
312 }
313
314 static krb5_error_code samba_kdc_message2entry_keys(krb5_context context,
315 struct samba_kdc_db_context *kdc_db_ctx,
316 TALLOC_CTX *mem_ctx,
317 struct ldb_message *msg,
318 uint32_t rid,
319 bool is_rodc,
320 uint32_t userAccountControl,
321 enum samba_kdc_ent_type ent_type,
322 struct sdb_entry_ex *entry_ex)
323 {
324 krb5_error_code ret = 0;
325 enum ndr_err_code ndr_err;
326 struct samr_Password *hash;
327 const struct ldb_val *sc_val;
328 struct supplementalCredentialsBlob scb;
329 struct supplementalCredentialsPackage *scpk = NULL;
330 bool newer_keys = false;
331 struct package_PrimaryKerberosBlob _pkb;
332 struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
333 struct package_PrimaryKerberosCtr4 *pkb4 = NULL;
334 uint16_t i;
335 uint16_t allocated_keys = 0;
336 int rodc_krbtgt_number = 0;
337 int kvno = 0;
338 uint32_t supported_enctypes
339 = ldb_msg_find_attr_as_uint(msg,
340 "msDS-SupportedEncryptionTypes",
341 0);
342
343 if (rid == DOMAIN_RID_KRBTGT || is_rodc) {
344 /* KDCs (and KDCs on RODCs) use AES */
345 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
346 } else if (userAccountControl & (UF_PARTIAL_SECRETS_ACCOUNT|UF_SERVER_TRUST_ACCOUNT)) {
347 /* DCs and RODCs comptuer accounts use AES */
348 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
349 } else if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT ||
350 (ent_type == SAMBA_KDC_ENT_TYPE_ANY)) {
351 /* for AS-REQ the client chooses the enc types it
352 * supports, and this will vary between computers a
353 * user logs in from.
354 *
355 * likewise for 'any' return as much as is supported,
356 * to export into a keytab */
357 supported_enctypes = ENC_ALL_TYPES;
358 }
359
360 /* If UF_USE_DES_KEY_ONLY has been set, then don't allow use of the newer enc types */
361 if (userAccountControl & UF_USE_DES_KEY_ONLY) {
362 supported_enctypes = ENC_CRC32|ENC_RSA_MD5;
363 } else {
364 /* Otherwise, add in the default enc types */
365 supported_enctypes |= ENC_CRC32 | ENC_RSA_MD5 | ENC_RC4_HMAC_MD5;
366 }
367
368 /* Is this the krbtgt or a RODC krbtgt */
369 if (is_rodc) {
370 rodc_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
371
372 if (rodc_krbtgt_number == -1) {
373 return EINVAL;
374 }
375 }
376
377 entry_ex->entry.keys.val = NULL;
378 entry_ex->entry.keys.len = 0;
379 entry_ex->entry.kvno = 0;
380
381 if ((ent_type == SAMBA_KDC_ENT_TYPE_CLIENT)
382 && (userAccountControl & UF_SMARTCARD_REQUIRED)) {
383 uint8_t secretbuffer[32];
384
385 /*
386 * Fake keys until we have a better way to reject
387 * non-pkinit requests.
388 *
389 * We just need to indicate which encryption types are
390 * supported.
391 */
392 generate_secret_buffer(secretbuffer, sizeof(secretbuffer));
393
394 allocated_keys = 3;
395 entry_ex->entry.keys.len = 0;
396 entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(struct sdb_key));
397 if (entry_ex->entry.keys.val == NULL) {
398 ZERO_STRUCT(secretbuffer);
399 ret = ENOMEM;
400 goto out;
401 }
402
403 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
404 struct sdb_key key = {};
405
406 ret = smb_krb5_keyblock_init_contents(context,
407 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
408 secretbuffer, 32,
409 &key.key);
410 if (ret) {
411 ZERO_STRUCT(secretbuffer);
412 goto out;
413 }
414
415 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
416 entry_ex->entry.keys.len++;
417 }
418
419 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
420 struct sdb_key key = {};
421
422 ret = smb_krb5_keyblock_init_contents(context,
423 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
424 secretbuffer, 16,
425 &key.key);
426 if (ret) {
427 ZERO_STRUCT(secretbuffer);
428 goto out;
429 }
430
431 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
432 entry_ex->entry.keys.len++;
433 }
434
435 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
436 struct sdb_key key = {};
437
438 ret = smb_krb5_keyblock_init_contents(context,
439 ENCTYPE_ARCFOUR_HMAC,
440 secretbuffer, 16,
441 &key.key);
442 if (ret) {
443 ZERO_STRUCT(secretbuffer);
444 goto out;
445 }
446
447 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
448 entry_ex->entry.keys.len++;
449 }
450
451 ret = 0;
452 goto out;
453 }
454
455 kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
456 if (is_rodc) {
457 kvno = SAMBA_KVNO_AND_KRBTGT(kvno, rodc_krbtgt_number);
458 }
459 entry_ex->entry.kvno = kvno;
460
461 /* Get keys from the db */
462
463 hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
464 sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
465
466 /* unicodePwd for enctype 0x17 (23) if present */
467 if (hash) {
468 allocated_keys++;
469 }
470
471 /* supplementalCredentials if present */
472 if (sc_val) {
473 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, &scb,
474 (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
475 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
476 dump_data(0, sc_val->data, sc_val->length);
477 ret = EINVAL;
478 goto out;
479 }
480
481 if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) {
482 if (scb.sub.num_packages != 0) {
483 NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
484 ret = EINVAL;
485 goto out;
486 }
487 }
488
489 for (i=0; i < scb.sub.num_packages; i++) {
490 if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) {
491 scpk = &scb.sub.packages[i];
492 if (!scpk->data || !scpk->data[0]) {
493 scpk = NULL;
494 continue;
495 }
496 newer_keys = true;
497 break;
498 } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) {
499 scpk = &scb.sub.packages[i];
500 if (!scpk->data || !scpk->data[0]) {
501 scpk = NULL;
502 }
503 /*
504 * we don't break here in hope to find
505 * a Kerberos-Newer-Keys package
506 */
507 }
508 }
509 }
510 /*
511 * Primary:Kerberos-Newer-Keys or Primary:Kerberos element
512 * of supplementalCredentials
513 */
514 if (scpk) {
515 DATA_BLOB blob;
516
517 blob = strhex_to_data_blob(mem_ctx, scpk->data);
518 if (!blob.data) {
519 ret = ENOMEM;
520 goto out;
521 }
522
523 /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */
524 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &_pkb,
525 (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
526 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
527 ret = EINVAL;
528 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
529 krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
530 goto out;
531 }
532
533 if (newer_keys && _pkb.version != 4) {
534 ret = EINVAL;
535 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
536 krb5_warnx(context, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
537 goto out;
538 }
539
540 if (!newer_keys && _pkb.version != 3) {
541 ret = EINVAL;
542 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
543 krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
544 goto out;
545 }
546
547 if (_pkb.version == 4) {
548 pkb4 = &_pkb.ctr.ctr4;
549 allocated_keys += pkb4->num_keys;
550 } else if (_pkb.version == 3) {
551 pkb3 = &_pkb.ctr.ctr3;
552 allocated_keys += pkb3->num_keys;
553 }
554 }
555
556 if (allocated_keys == 0) {
557 if (kdc_db_ctx->rodc) {
558 /* We are on an RODC, but don't have keys for this account. Signal this to the caller */
559 auth_sam_trigger_repl_secret(kdc_db_ctx, kdc_db_ctx->msg_ctx,
560 kdc_db_ctx->ev_ctx, msg->dn);
561 return SDB_ERR_NOT_FOUND_HERE;
562 }
563
564 /* oh, no password. Apparently (comment in
565 * hdb-ldap.c) this violates the ASN.1, but this
566 * allows an entry with no keys (yet). */
567 return 0;
568 }
569
570 /* allocate space to decode into */
571 entry_ex->entry.keys.len = 0;
572 entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(struct sdb_key));
573 if (entry_ex->entry.keys.val == NULL) {
574 ret = ENOMEM;
575 goto out;
576 }
577
578 if (hash && (supported_enctypes & ENC_RC4_HMAC_MD5)) {
579 struct sdb_key key = {};
580
581 ret = smb_krb5_keyblock_init_contents(context,
582 ENCTYPE_ARCFOUR_HMAC,
583 hash->hash,
584 sizeof(hash->hash),
585 &key.key);
586 if (ret) {
587 goto out;
588 }
589
590 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
591 entry_ex->entry.keys.len++;
592 }
593
594 if (pkb4) {
595 for (i=0; i < pkb4->num_keys; i++) {
596 struct sdb_key key = {};
597
598 if (!pkb4->keys[i].value) continue;
599
600 if (!(kerberos_enctype_to_bitmap(pkb4->keys[i].keytype) & supported_enctypes)) {
601 continue;
602 }
603
604 if (pkb4->salt.string) {
605 DATA_BLOB salt;
606
607 salt = data_blob_string_const(pkb4->salt.string);
608
609 key.salt = calloc(1, sizeof(*key.salt));
610 if (key.salt == NULL) {
611 ret = ENOMEM;
612 goto out;
613 }
614
615 key.salt->type = KRB5_PW_SALT;
616
617 ret = smb_krb5_copy_data_contents(&key.salt->salt,
618 salt.data,
619 salt.length);
620 if (ret) {
621 free(key.salt);
622 key.salt = NULL;
623 goto out;
624 }
625 }
626
627 /* TODO: maybe pass the iteration_count somehow... */
628
629 ret = smb_krb5_keyblock_init_contents(context,
630 pkb4->keys[i].keytype,
631 pkb4->keys[i].value->data,
632 pkb4->keys[i].value->length,
633 &key.key);
634 if (ret == KRB5_PROG_ETYPE_NOSUPP) {
635 DEBUG(2,("Unsupported keytype ignored - type %u\n",
636 pkb4->keys[i].keytype));
637 ret = 0;
638 continue;
639 }
640 if (ret) {
641 if (key.salt) {
642 smb_krb5_free_data_contents(context, &key.salt->salt);
643 free(key.salt);
644 key.salt = NULL;
645 }
646 goto out;
647 }
648
649 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
650 entry_ex->entry.keys.len++;
651 }
652 } else if (pkb3) {
653 for (i=0; i < pkb3->num_keys; i++) {
654 struct sdb_key key = {};
655
656 if (!pkb3->keys[i].value) continue;
657
658 if (!(kerberos_enctype_to_bitmap(pkb3->keys[i].keytype) & supported_enctypes)) {
659 continue;
660 }
661
662 if (pkb3->salt.string) {
663 DATA_BLOB salt;
664
665 salt = data_blob_string_const(pkb3->salt.string);
666
667 key.salt = calloc(1, sizeof(*key.salt));
668 if (key.salt == NULL) {
669 ret = ENOMEM;
670 goto out;
671 }
672
673 key.salt->type = KRB5_PW_SALT;
674
675 ret = smb_krb5_copy_data_contents(&key.salt->salt,
676 salt.data,
677 salt.length);
678 if (ret) {
679 free(key.salt);
680 key.salt = NULL;
681 goto out;
682 }
683 }
684
685 ret = smb_krb5_keyblock_init_contents(context,
686 pkb3->keys[i].keytype,
687 pkb3->keys[i].value->data,
688 pkb3->keys[i].value->length,
689 &key.key);
690 if (ret) {
691 if (key.salt) {
692 smb_krb5_free_data_contents(context, &key.salt->salt);
693 free(key.salt);
694 key.salt = NULL;
695 }
696 goto out;
697 }
698
699 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
700 entry_ex->entry.keys.len++;
701 }
702 }
703
704 out:
705 if (ret != 0) {
706 entry_ex->entry.keys.len = 0;
707 } else if (entry_ex->entry.keys.len > 0 &&
708 entry_ex->entry.keys.val != NULL) {
709 ret = samba_kdc_sort_encryption_keys(entry_ex);
710 if (ret != 0) {
711 entry_ex->entry.keys.len = 0;
712 ret = ENOMEM;
713 }
714 }
715 if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
716 free(entry_ex->entry.keys.val);
717 entry_ex->entry.keys.val = NULL;
718 }
719 return ret;
720 }
721
722 static int principal_comp_strcmp_int(krb5_context context,
723 krb5_const_principal principal,
724 unsigned int component,
725 const char *string,
726 bool do_strcasecmp)
727 {
728 const char *p;
729 size_t len;
730
731 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
732 p = krb5_principal_get_comp_string(context, principal, component);
733 if (p == NULL) {
734 return -1;
735 }
736 len = strlen(p);
737 #else
738 krb5_data *d;
739 if (component >= krb5_princ_size(context, principal)) {
740 return -1;
741 }
742
743 d = krb5_princ_component(context, principal, component);
744 if (d == NULL) {
745 return -1;
746 }
747
748 p = d->data;
749 len = d->length;
750 #endif
751 if (do_strcasecmp) {
752 return strncasecmp(p, string, len);
753 } else {
754 return strncmp(p, string, len);
755 }
756 }
757
758 static int principal_comp_strcasecmp(krb5_context context,
759 krb5_const_principal principal,
760 unsigned int component,
761 const char *string)
762 {
763 return principal_comp_strcmp_int(context, principal,
764 component, string, true);
765 }
766
767 static int principal_comp_strcmp(krb5_context context,
768 krb5_const_principal principal,
769 unsigned int component,
770 const char *string)
771 {
772 return principal_comp_strcmp_int(context, principal,
773 component, string, false);
774 }
775
776 /*
777 * Construct an hdb_entry from a directory entry.
778 */
779 static krb5_error_code samba_kdc_message2entry(krb5_context context,
780 struct samba_kdc_db_context *kdc_db_ctx,
781 TALLOC_CTX *mem_ctx,
782 krb5_const_principal principal,
783 enum samba_kdc_ent_type ent_type,
784 unsigned flags,
785 struct ldb_dn *realm_dn,
786 struct ldb_message *msg,
787 struct sdb_entry_ex *entry_ex)
788 {
789 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
790 uint32_t userAccountControl;
791 uint32_t msDS_User_Account_Control_Computed;
792 krb5_error_code ret = 0;
793 krb5_boolean is_computer = FALSE;
794
795 struct samba_kdc_entry *p;
796 NTTIME acct_expiry;
797 NTSTATUS status;
798
799 uint32_t rid;
800 bool is_rodc = false;
801 struct ldb_message_element *objectclasses;
802 struct ldb_val computer_val;
803 const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
804 computer_val.data = discard_const_p(uint8_t,"computer");
805 computer_val.length = strlen((const char *)computer_val.data);
806
807 if (ldb_msg_find_element(msg, "msDS-SecondaryKrbTgtNumber")) {
808 is_rodc = true;
809 }
810
811 if (!samAccountName) {
812 ret = ENOENT;
813 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no samAccountName present");
814 goto out;
815 }
816
817 objectclasses = ldb_msg_find_element(msg, "objectClass");
818
819 if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
820 is_computer = TRUE;
821 }
822
823 ZERO_STRUCTP(entry_ex);
824
825 p = talloc_zero(mem_ctx, struct samba_kdc_entry);
826 if (!p) {
827 ret = ENOMEM;
828 goto out;
829 }
830
831 p->is_rodc = is_rodc;
832 p->kdc_db_ctx = kdc_db_ctx;
833 p->realm_dn = talloc_reference(p, realm_dn);
834 if (!p->realm_dn) {
835 ret = ENOMEM;
836 goto out;
837 }
838
839 talloc_set_destructor(p, samba_kdc_entry_destructor);
840
841 entry_ex->ctx = p;
842
843 userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
844
845 msDS_User_Account_Control_Computed
846 = ldb_msg_find_attr_as_uint(msg,
847 "msDS-User-Account-Control-Computed",
848 UF_ACCOUNTDISABLE);
849
850 /*
851 * This brings in the lockout flag, block the account if not
852 * found. We need the weird UF_ACCOUNTDISABLE check because
853 * we do not want to fail open if the value is not returned,
854 * but 0 is a valid value (all OK)
855 */
856 if (msDS_User_Account_Control_Computed == UF_ACCOUNTDISABLE) {
857 ret = EINVAL;
858 krb5_set_error_message(context, ret, "samba_kdc_message2entry: "
859 "no msDS-User-Account-Control-Computed present");
860 goto out;
861 } else {
862 userAccountControl |= msDS_User_Account_Control_Computed;
863 }
864
865 /*
866 * If we are set to canonicalize, we get back the fixed UPPER
867 * case realm, and the real username (ie matching LDAP
868 * samAccountName)
869 *
870 * Otherwise, if we are set to enterprise, we
871 * get back the whole principal as-sent
872 *
873 * Finally, if we are not set to canonicalize, we get back the
874 * fixed UPPER case realm, but the as-sent username
875 */
876
877 if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT) {
878 p->is_krbtgt = true;
879
880 if (flags & (SDB_F_CANON)) {
881 /*
882 * When requested to do so, ensure that the
883 * both realm values in the principal are set
884 * to the upper case, canonical realm
885 */
886 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal,
887 lpcfg_realm(lp_ctx), "krbtgt",
888 lpcfg_realm(lp_ctx), NULL);
889 if (ret) {
890 krb5_clear_error_message(context);
891 goto out;
892 }
893 smb_krb5_principal_set_type(context, entry_ex->entry.principal, KRB5_NT_SRV_INST);
894 } else {
895 ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
896 if (ret) {
897 krb5_clear_error_message(context);
898 goto out;
899 }
900 /*
901 * this appears to be required regardless of
902 * the canonicalize flag from the client
903 */
904 ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
905 if (ret) {
906 krb5_clear_error_message(context);
907 goto out;
908 }
909 }
910
911 } else if (ent_type == SAMBA_KDC_ENT_TYPE_ANY && principal == NULL) {
912 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
913 if (ret) {
914 krb5_clear_error_message(context);
915 goto out;
916 }
917 } else if ((flags & SDB_F_CANON) && (flags & SDB_F_FOR_AS_REQ)) {
918 /*
919 * SDB_F_CANON maps from the canonicalize flag in the
920 * packet, and has a different meaning between AS-REQ
921 * and TGS-REQ. We only change the principal in the AS-REQ case
922 */
923 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
924 if (ret) {
925 krb5_clear_error_message(context);
926 goto out;
927 }
928 } else {
929 ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
930 if (ret) {
931 krb5_clear_error_message(context);
932 goto out;
933 }
934
935 if (smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL) {
936 /* While we have copied the client principal, tests
937 * show that Win2k3 returns the 'corrected' realm, not
938 * the client-specified realm. This code attempts to
939 * replace the client principal's realm with the one
940 * we determine from our records */
941
942 /* this has to be with malloc() */
943 ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
944 if (ret) {
945 krb5_clear_error_message(context);
946 goto out;
947 }
948 }
949 }
950
951 /* First try and figure out the flags based on the userAccountControl */
952 entry_ex->entry.flags = uf2SDBFlags(context, userAccountControl, ent_type);
953
954 /* Windows 2008 seems to enforce this (very sensible) rule by
955 * default - don't allow offline attacks on a user's password
956 * by asking for a ticket to them as a service (encrypted with
957 * their probably patheticly insecure password) */
958
959 if (entry_ex->entry.flags.server
960 && lpcfg_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
961 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
962 entry_ex->entry.flags.server = 0;
963 }
964 }
965 /*
966 * To give the correct type of error to the client, we must
967 * not just return the entry without .server set, we must
968 * pretend the principal does not exist. Otherwise we may
969 * return ERR_POLICY instead of
970 * KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
971 */
972 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER && entry_ex->entry.flags.server == 0) {
973 ret = SDB_ERR_NOENTRY;
974 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no servicePrincipalName present for this server, refusing with no-such-entry");
975 goto out;
976 }
977 if (flags & SDB_F_ADMIN_DATA) {
978 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
979 * of the Heimdal KDC. They are stored in a the traditional
980 * DB for audit purposes, and still form part of the structure
981 * we must return */
982
983 /* use 'whenCreated' */
984 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
985 /* use 'kadmin' for now (needed by mit_samba) */
986
987 ret = smb_krb5_make_principal(context,
988 &entry_ex->entry.created_by.principal,
989 lpcfg_realm(lp_ctx), "kadmin", NULL);
990 if (ret) {
991 krb5_clear_error_message(context);
992 goto out;
993 }
994
995 entry_ex->entry.modified_by = (struct sdb_event *) malloc(sizeof(struct sdb_event));
996 if (entry_ex->entry.modified_by == NULL) {
997 ret = ENOMEM;
998 krb5_set_error_message(context, ret, "malloc: out of memory");
999 goto out;
1000 }
1001
1002 /* use 'whenChanged' */
1003 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
1004 /* use 'kadmin' for now (needed by mit_samba) */
1005 ret = smb_krb5_make_principal(context,
1006 &entry_ex->entry.modified_by->principal,
1007 lpcfg_realm(lp_ctx), "kadmin", NULL);
1008 if (ret) {
1009 krb5_clear_error_message(context);
1010 goto out;
1011 }
1012 }
1013
1014
1015 /* The lack of password controls etc applies to krbtgt by
1016 * virtue of being that particular RID */
1017 status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
1018
1019 if (!NT_STATUS_IS_OK(status)) {
1020 ret = EINVAL;
1021 goto out;
1022 }
1023
1024 if (rid == DOMAIN_RID_KRBTGT) {
1025 char *realm = NULL;
1026
1027 entry_ex->entry.valid_end = NULL;
1028 entry_ex->entry.pw_end = NULL;
1029
1030 entry_ex->entry.flags.invalid = 0;
1031 entry_ex->entry.flags.server = 1;
1032
1033 realm = smb_krb5_principal_get_realm(context, principal);
1034 if (realm == NULL) {
1035 ret = ENOMEM;
1036 goto out;
1037 }
1038
1039 /* Don't mark all requests for the krbtgt/realm as
1040 * 'change password', as otherwise we could get into
1041 * trouble, and not enforce the password expirty.
1042 * Instead, only do it when request is for the kpasswd service */
1043 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER
1044 && krb5_princ_size(context, principal) == 2
1045 && (principal_comp_strcmp(context, principal, 0, "kadmin") == 0)
1046 && (principal_comp_strcmp(context, principal, 1, "changepw") == 0)
1047 && lpcfg_is_my_domain_or_realm(lp_ctx, realm)) {
1048 entry_ex->entry.flags.change_pw = 1;
1049 }
1050
1051 SAFE_FREE(realm);
1052
1053 entry_ex->entry.flags.client = 0;
1054 entry_ex->entry.flags.forwardable = 1;
1055 entry_ex->entry.flags.ok_as_delegate = 1;
1056 } else if (is_rodc) {
1057 /* The RODC krbtgt account is like the main krbtgt,
1058 * but it does not have a changepw or kadmin
1059 * service */
1060
1061 entry_ex->entry.valid_end = NULL;
1062 entry_ex->entry.pw_end = NULL;
1063
1064 /* Also don't allow the RODC krbtgt to be a client (it should not be needed) */
1065 entry_ex->entry.flags.client = 0;
1066 entry_ex->entry.flags.invalid = 0;
1067 entry_ex->entry.flags.server = 1;
1068
1069 entry_ex->entry.flags.client = 0;
1070 entry_ex->entry.flags.forwardable = 1;
1071 entry_ex->entry.flags.ok_as_delegate = 0;
1072 } else if (entry_ex->entry.flags.server && ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
1073 /* The account/password expiry only applies when the account is used as a
1074 * client (ie password login), not when used as a server */
1075
1076 /* Make very well sure we don't use this for a client,
1077 * it could bypass the password restrictions */
1078 entry_ex->entry.flags.client = 0;
1079
1080 entry_ex->entry.valid_end = NULL;
1081 entry_ex->entry.pw_end = NULL;
1082
1083 } else {
1084 NTTIME must_change_time
1085 = samdb_result_nttime(msg,
1086 "msDS-UserPasswordExpiryTimeComputed",
1087 0);
1088 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
1089 entry_ex->entry.pw_end = NULL;
1090 } else {
1091 entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
1092 if (entry_ex->entry.pw_end == NULL) {
1093 ret = ENOMEM;
1094 goto out;
1095 }
1096 *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
1097 }
1098
1099 acct_expiry = samdb_result_account_expires(msg);
1100 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
1101 entry_ex->entry.valid_end = NULL;
1102 } else {
1103 entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
1104 if (entry_ex->entry.valid_end == NULL) {
1105 ret = ENOMEM;
1106 goto out;
1107 }
1108 *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
1109 }
1110 }
1111
1112 entry_ex->entry.valid_start = NULL;
1113
1114 entry_ex->entry.max_life = malloc(sizeof(*entry_ex->entry.max_life));
1115 if (entry_ex->entry.max_life == NULL) {
1116 ret = ENOMEM;
1117 goto out;
1118 }
1119
1120 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
1121 *entry_ex->entry.max_life = kdc_db_ctx->policy.svc_tkt_lifetime;
1122 } else if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT || ent_type == SAMBA_KDC_ENT_TYPE_CLIENT) {
1123 *entry_ex->entry.max_life = kdc_db_ctx->policy.usr_tkt_lifetime;
1124 } else {
1125 *entry_ex->entry.max_life = MIN(kdc_db_ctx->policy.svc_tkt_lifetime,
1126 kdc_db_ctx->policy.usr_tkt_lifetime);
1127 }
1128
1129 entry_ex->entry.max_renew = malloc(sizeof(*entry_ex->entry.max_life));
1130 if (entry_ex->entry.max_renew == NULL) {
1131 ret = ENOMEM;
1132 goto out;
1133 }
1134
1135 *entry_ex->entry.max_renew = kdc_db_ctx->policy.renewal_lifetime;
1136
1137 /* Get keys from the db */
1138 ret = samba_kdc_message2entry_keys(context, kdc_db_ctx, p, msg,
1139 rid, is_rodc, userAccountControl,
1140 ent_type, entry_ex);
1141 if (ret) {
1142 /* Could be bogus data in the entry, or out of memory */
1143 goto out;
1144 }
1145
1146 p->msg = talloc_steal(p, msg);
1147
1148 out:
1149 if (ret != 0) {
1150 /* This doesn't free ent itself, that is for the eventual caller to do */
1151 sdb_free_entry(entry_ex);
1152 ZERO_STRUCTP(entry_ex);
1153 } else {
1154 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1155 }
1156
1157 return ret;
1158 }
1159
1160 /*
1161 * Construct an hdb_entry from a directory entry.
1162 * The kvno is what the remote client asked for
1163 */
1164 static krb5_error_code samba_kdc_trust_message2entry(krb5_context context,
1165 struct samba_kdc_db_context *kdc_db_ctx,
1166 TALLOC_CTX *mem_ctx, krb5_const_principal principal,
1167 enum trust_direction direction,
1168 struct ldb_dn *realm_dn,
1169 unsigned flags,
1170 uint32_t kvno,
1171 struct ldb_message *msg,
1172 struct sdb_entry_ex *entry_ex)
1173 {
1174 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1175 const char *our_realm = lpcfg_realm(lp_ctx);
1176 char *partner_realm = NULL;
1177 const char *realm = NULL;
1178 const char *krbtgt_realm = NULL;
1179 DATA_BLOB password_utf16 = data_blob_null;
1180 DATA_BLOB password_utf8 = data_blob_null;
1181 struct samr_Password _password_hash;
1182 const struct samr_Password *password_hash = NULL;
1183 const struct ldb_val *password_val;
1184 struct trustAuthInOutBlob password_blob;
1185 struct samba_kdc_entry *p;
1186 bool use_previous = false;
1187 uint32_t current_kvno;
1188 uint32_t previous_kvno;
1189 uint32_t num_keys = 0;
1190 enum ndr_err_code ndr_err;
1191 int ret;
1192 unsigned int i;
1193 struct AuthenticationInformationArray *auth_array;
1194 struct timeval tv;
1195 NTTIME an_hour_ago;
1196 uint32_t *auth_kvno;
1197 bool preferr_current = false;
1198 uint32_t supported_enctypes = ENC_RC4_HMAC_MD5;
1199 struct lsa_TrustDomainInfoInfoEx *tdo = NULL;
1200 NTSTATUS status;
1201
1202 if (dsdb_functional_level(kdc_db_ctx->samdb) >= DS_DOMAIN_FUNCTION_2008) {
1203 supported_enctypes = ldb_msg_find_attr_as_uint(msg,
1204 "msDS-SupportedEncryptionTypes",
1205 supported_enctypes);
1206 }
1207
1208 status = dsdb_trust_parse_tdo_info(mem_ctx, msg, &tdo);
1209 if (!NT_STATUS_IS_OK(status)) {
1210 krb5_clear_error_message(context);
1211 ret = ENOMEM;
1212 goto out;
1213 }
1214
1215 if (!(tdo->trust_direction & direction)) {
1216 krb5_clear_error_message(context);
1217 ret = SDB_ERR_NOENTRY;
1218 goto out;
1219 }
1220
1221 if (tdo->trust_type != LSA_TRUST_TYPE_UPLEVEL) {
1222 /*
1223 * Only UPLEVEL domains support kerberos here,
1224 * as we don't support LSA_TRUST_TYPE_MIT.
1225 */
1226 krb5_clear_error_message(context);
1227 ret = SDB_ERR_NOENTRY;
1228 goto out;
1229 }
1230
1231 if (tdo->trust_attributes & LSA_TRUST_ATTRIBUTE_CROSS_ORGANIZATION) {
1232 /*
1233 * We don't support selective authentication yet.
1234 */
1235 krb5_clear_error_message(context);
1236 ret = SDB_ERR_NOENTRY;
1237 goto out;
1238 }
1239
1240 if (tdo->domain_name.string == NULL) {
1241 krb5_clear_error_message(context);
1242 ret = SDB_ERR_NOENTRY;
1243 goto out;
1244 }
1245 partner_realm = strupper_talloc(mem_ctx, tdo->domain_name.string);
1246 if (partner_realm == NULL) {
1247 krb5_clear_error_message(context);
1248 ret = ENOMEM;
1249 goto out;
1250 }
1251
1252 if (direction == INBOUND) {
1253 realm = our_realm;
1254 krbtgt_realm = partner_realm;
1255
1256 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
1257 } else { /* OUTBOUND */
1258 realm = partner_realm;
1259 krbtgt_realm = our_realm;
1260
1261 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
1262 }
1263
1264 if (password_val == NULL) {
1265 krb5_clear_error_message(context);
1266 ret = SDB_ERR_NOENTRY;
1267 goto out;
1268 }
1269
1270 ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, &password_blob,
1271 (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
1272 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1273 krb5_clear_error_message(context);
1274 ret = EINVAL;
1275 goto out;
1276 }
1277
1278 p = talloc_zero(mem_ctx, struct samba_kdc_entry);
1279 if (!p) {
1280 ret = ENOMEM;
1281 goto out;
1282 }
1283
1284 p->is_trust = true;
1285 p->kdc_db_ctx = kdc_db_ctx;
1286 p->realm_dn = realm_dn;
1287
1288 talloc_set_destructor(p, samba_kdc_entry_destructor);
1289
1290 /* make sure we do not have bogus data in there */
1291 memset(&entry_ex->entry, 0, sizeof(struct sdb_entry));
1292
1293 entry_ex->ctx = p;
1294
1295 /* use 'whenCreated' */
1296 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
1297 /* use 'kadmin' for now (needed by mit_samba) */
1298 ret = smb_krb5_make_principal(context,
1299 &entry_ex->entry.created_by.principal,
1300 realm, "kadmin", NULL);
1301 if (ret) {
1302 krb5_clear_error_message(context);
1303 goto out;
1304 }
1305
1306 /*
1307 * We always need to generate the canonicalized principal
1308 * with the values of our database.
1309 */
1310 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, realm,
1311 "krbtgt", krbtgt_realm, NULL);
1312 if (ret) {
1313 krb5_clear_error_message(context);
1314 goto out;
1315 }
1316 smb_krb5_principal_set_type(context, entry_ex->entry.principal,
1317 KRB5_NT_SRV_INST);
1318
1319 entry_ex->entry.valid_start = NULL;
1320
1321 /* we need to work out if we are going to use the current or
1322 * the previous password hash.
1323 * We base this on the kvno the client passes in. If the kvno
1324 * passed in is equal to the current kvno in our database then
1325 * we use the current structure. If it is the current kvno-1,
1326 * then we use the previous substrucure.
1327 */
1328
1329 /*
1330 * Windows preferrs the previous key for one hour.
1331 */
1332 tv = timeval_current();
1333 if (tv.tv_sec > 3600) {
1334 tv.tv_sec -= 3600;
1335 }
1336 an_hour_ago = timeval_to_nttime(&tv);
1337
1338 /* first work out the current kvno */
1339 current_kvno = 0;
1340 for (i=0; i < password_blob.count; i++) {
1341 struct AuthenticationInformation *a =
1342 &password_blob.current.array[i];
1343
1344 if (a->LastUpdateTime <= an_hour_ago) {
1345 preferr_current = true;
1346 }
1347
1348 if (a->AuthType == TRUST_AUTH_TYPE_VERSION) {
1349 current_kvno = a->AuthInfo.version.version;
1350 }
1351 }
1352 if (current_kvno == 0) {
1353 previous_kvno = 255;
1354 } else {
1355 previous_kvno = current_kvno - 1;
1356 }
1357 for (i=0; i < password_blob.count; i++) {
1358 struct AuthenticationInformation *a =
1359 &password_blob.previous.array[i];
1360
1361 if (a->AuthType == TRUST_AUTH_TYPE_VERSION) {
1362 previous_kvno = a->AuthInfo.version.version;
1363 }
1364 }
1365
1366 /* work out whether we will use the previous or current
1367 password */
1368 if (password_blob.previous.count == 0) {
1369 /* there is no previous password */
1370 use_previous = false;
1371 } else if (!(flags & SDB_F_KVNO_SPECIFIED)) {
1372 /*
1373 * If not specified we use the lowest kvno
1374 * for the first hour after an update.
1375 */
1376 if (preferr_current) {
1377 use_previous = false;
1378 } else if (previous_kvno < current_kvno) {
1379 use_previous = true;
1380 } else {
1381 use_previous = false;
1382 }
1383 } else if (kvno == current_kvno) {
1384 /*
1385 * Exact match ...
1386 */
1387 use_previous = false;
1388 } else if (kvno == previous_kvno) {
1389 /*
1390 * Exact match ...
1391 */
1392 use_previous = true;
1393 } else {
1394 /*
1395 * Fallback to the current one for anything else
1396 */
1397 use_previous = false;
1398 }
1399
1400 if (use_previous) {
1401 auth_array = &password_blob.previous;
1402 auth_kvno = &previous_kvno;
1403 } else {
1404 auth_array = &password_blob.current;
1405 auth_kvno = &current_kvno;
1406 }
1407
1408 /* use the kvno the client specified, if available */
1409 if (flags & SDB_F_KVNO_SPECIFIED) {
1410 entry_ex->entry.kvno = kvno;
1411 } else {
1412 entry_ex->entry.kvno = *auth_kvno;
1413 }
1414
1415 for (i=0; i < auth_array->count; i++) {
1416 if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
1417 bool ok;
1418
1419 password_utf16 = data_blob_const(auth_array->array[i].AuthInfo.clear.password,
1420 auth_array->array[i].AuthInfo.clear.size);
1421 if (password_utf16.length == 0) {
1422 break;
1423 }
1424
1425 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1426 mdfour(_password_hash.hash, password_utf16.data, password_utf16.length);
1427 if (password_hash == NULL) {
1428 num_keys += 1;
1429 }
1430 password_hash = &_password_hash;
1431 }
1432
1433 if (!(supported_enctypes & (ENC_HMAC_SHA1_96_AES128|ENC_HMAC_SHA1_96_AES256))) {
1434 break;
1435 }
1436
1437 ok = convert_string_talloc(mem_ctx,
1438 CH_UTF16MUNGED, CH_UTF8,
1439 password_utf16.data,
1440 password_utf16.length,
1441 (void *)&password_utf8.data,
1442 &password_utf8.length);
1443 if (!ok) {
1444 krb5_clear_error_message(context);
1445 ret = ENOMEM;
1446 goto out;
1447 }
1448
1449 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1450 num_keys += 1;
1451 }
1452 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1453 num_keys += 1;
1454 }
1455 break;
1456 } else if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
1457 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1458 password_hash = &auth_array->array[i].AuthInfo.nt4owf.password;
1459 num_keys += 1;
1460 }
1461 }
1462 }
1463
1464 /* Must have found a cleartext or MD4 password */
1465 if (num_keys == 0) {
1466 DEBUG(1,(__location__ ": no usable key found\n"));
1467 krb5_clear_error_message(context);
1468 ret = SDB_ERR_NOENTRY;
1469 goto out;
1470 }
1471
1472 entry_ex->entry.keys.val = calloc(num_keys, sizeof(struct sdb_key));
1473 if (entry_ex->entry.keys.val == NULL) {
1474 krb5_clear_error_message(context);
1475 ret = ENOMEM;
1476 goto out;
1477 }
1478
1479 if (password_utf8.length != 0) {
1480 struct sdb_key key = {};
1481 krb5_const_principal salt_principal = entry_ex->entry.principal;
1482 krb5_data salt;
1483 krb5_data cleartext_data;
1484
1485 cleartext_data.data = discard_const_p(char, password_utf8.data);
1486 cleartext_data.length = password_utf8.length;
1487
1488 ret = smb_krb5_get_pw_salt(context,
1489 salt_principal,
1490 &salt);
1491 if (ret != 0) {
1492 goto out;
1493 }
1494
1495 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1496 ret = smb_krb5_create_key_from_string(context,
1497 salt_principal,
1498 &salt,
1499 &cleartext_data,
1500 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
1501 &key.key);
1502 if (ret != 0) {
1503 smb_krb5_free_data_contents(context, &salt);
1504 goto out;
1505 }
1506
1507 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1508 entry_ex->entry.keys.len++;
1509 }
1510
1511 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1512 ret = smb_krb5_create_key_from_string(context,
1513 salt_principal,
1514 &salt,
1515 &cleartext_data,
1516 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
1517 &key.key);
1518 if (ret != 0) {
1519 smb_krb5_free_data_contents(context, &salt);
1520 goto out;
1521 }
1522
1523 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1524 entry_ex->entry.keys.len++;
1525 }
1526
1527 smb_krb5_free_data_contents(context, &salt);
1528 }
1529
1530 if (password_hash != NULL) {
1531 struct sdb_key key = {};
1532
1533 ret = smb_krb5_keyblock_init_contents(context,
1534 ENCTYPE_ARCFOUR_HMAC,
1535 password_hash->hash,
1536 sizeof(password_hash->hash),
1537 &key.key);
1538 if (ret != 0) {
1539 goto out;
1540 }
1541
1542 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1543 entry_ex->entry.keys.len++;
1544 }
1545
1546 entry_ex->entry.flags = int2SDBFlags(0);
1547 entry_ex->entry.flags.immutable = 1;
1548 entry_ex->entry.flags.invalid = 0;
1549 entry_ex->entry.flags.server = 1;
1550 entry_ex->entry.flags.require_preauth = 1;
1551
1552 entry_ex->entry.pw_end = NULL;
1553
1554 entry_ex->entry.max_life = NULL;
1555
1556 entry_ex->entry.max_renew = NULL;
1557
1558 ret = samba_kdc_sort_encryption_keys(entry_ex);
1559 if (ret != 0) {
1560 krb5_clear_error_message(context);
1561 ret = ENOMEM;
1562 goto out;
1563 }
1564
1565 p->msg = talloc_steal(p, msg);
1566
1567 out:
1568 TALLOC_FREE(partner_realm);
1569
1570 if (ret != 0) {
1571 /* This doesn't free ent itself, that is for the eventual caller to do */
1572 sdb_free_entry(entry_ex);
1573 } else {
1574 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1575 }
1576
1577 return ret;
1578
1579 }
1580
1581 static krb5_error_code samba_kdc_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
1582 TALLOC_CTX *mem_ctx,
1583 const char *realm,
1584 struct ldb_dn *realm_dn,
1585 struct ldb_message **pmsg)
1586 {
1587 NTSTATUS status;
1588 const char * const *attrs = trust_attrs;
1589
1590 status = dsdb_trust_search_tdo(ldb_ctx, realm, realm,
1591 attrs, mem_ctx, pmsg);
1592 if (NT_STATUS_IS_OK(status)) {
1593 return 0;
1594 } else if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1595 return SDB_ERR_NOENTRY;
1596 } else if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1597 int ret = ENOMEM;
1598 krb5_set_error_message(context, ret, "get_sam_result_trust: out of memory");
1599 return ret;
1600 } else {
1601 int ret = EINVAL;
1602 krb5_set_error_message(context, ret, "get_sam_result_trust: %s", nt_errstr(status));
1603 return ret;
1604 }
1605 }
1606
1607 static krb5_error_code samba_kdc_lookup_client(krb5_context context,
1608 struct samba_kdc_db_context *kdc_db_ctx,
1609 TALLOC_CTX *mem_ctx,
1610 krb5_const_principal principal,
1611 const char **attrs,
1612 struct ldb_dn **realm_dn,
1613 struct ldb_message **msg)
1614 {
1615 NTSTATUS nt_status;
1616 char *principal_string = NULL;
1617
1618 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1619 principal_string = smb_krb5_principal_get_comp_string(mem_ctx, context,
1620 principal, 0);
1621 if (principal_string == NULL) {
1622 return ENOMEM;
1623 }
1624 } else {
1625 char *principal_string_m = NULL;
1626 krb5_error_code ret;
1627
1628 ret = krb5_unparse_name(context, principal, &principal_string_m);
1629 if (ret != 0) {
1630 return ret;
1631 }
1632
1633 principal_string = talloc_strdup(mem_ctx, principal_string_m);
1634 SAFE_FREE(principal_string_m);
1635 if (principal_string == NULL) {
1636 return ENOMEM;
1637 }
1638 }
1639
1640 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1641 mem_ctx, principal_string, attrs,
1642 realm_dn, msg);
1643 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1644 krb5_principal fallback_principal = NULL;
1645 unsigned int num_comp;
1646 char *fallback_realm = NULL;
1647 char *fallback_account = NULL;
1648 krb5_error_code ret;
1649
1650 ret = krb5_parse_name(context, principal_string,
1651 &fallback_principal);
1652 TALLOC_FREE(principal_string);
1653 if (ret != 0) {
1654 return ret;
1655 }
1656
1657 num_comp = krb5_princ_size(context, fallback_principal);
1658 fallback_realm = smb_krb5_principal_get_realm(context,
1659 fallback_principal);
1660 if (fallback_realm == NULL) {
1661 krb5_free_principal(context, fallback_principal);
1662 return ENOMEM;
1663 }
1664
1665 if (num_comp == 1) {
1666 size_t len;
1667
1668 fallback_account = smb_krb5_principal_get_comp_string(mem_ctx,
1669 context, fallback_principal, 0);
1670 if (fallback_account == NULL) {
1671 krb5_free_principal(context, fallback_principal);
1672 SAFE_FREE(fallback_realm);
1673 return ENOMEM;
1674 }
1675
1676 len = strlen(fallback_account);
1677 if (len >= 2 && fallback_account[len - 1] == '$') {
1678 TALLOC_FREE(fallback_account);
1679 }
1680 }
1681 krb5_free_principal(context, fallback_principal);
1682 fallback_principal = NULL;
1683
1684 if (fallback_account != NULL) {
1685 char *with_dollar;
1686
1687 with_dollar = talloc_asprintf(mem_ctx, "%s$",
1688 fallback_account);
1689 if (with_dollar == NULL) {
1690 SAFE_FREE(fallback_realm);
1691 return ENOMEM;
1692 }
1693 TALLOC_FREE(fallback_account);
1694
1695 ret = smb_krb5_make_principal(context,
1696 &fallback_principal,
1697 fallback_realm,
1698 with_dollar, NULL);
1699 TALLOC_FREE(with_dollar);
1700 if (ret != 0) {
1701 SAFE_FREE(fallback_realm);
1702 return ret;
1703 }
1704 }
1705 SAFE_FREE(fallback_realm);
1706
1707 if (fallback_principal != NULL) {
1708 char *fallback_string = NULL;
1709
1710 ret = krb5_unparse_name(context,
1711 fallback_principal,
1712 &fallback_string);
1713 if (ret != 0) {
1714 krb5_free_principal(context, fallback_principal);
1715 return ret;
1716 }
1717
1718 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1719 mem_ctx,
1720 fallback_string,
1721 attrs,
1722 realm_dn, msg);
1723 SAFE_FREE(fallback_string);
1724 }
1725 krb5_free_principal(context, fallback_principal);
1726 fallback_principal = NULL;
1727 }
1728 TALLOC_FREE(principal_string);
1729
1730 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1731 return SDB_ERR_NOENTRY;
1732 } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1733 return ENOMEM;
1734 } else if (!NT_STATUS_IS_OK(nt_status)) {
1735 return EINVAL;
1736 }
1737
1738 return 0;
1739 }
1740
1741 static krb5_error_code samba_kdc_fetch_client(krb5_context context,
1742 struct samba_kdc_db_context *kdc_db_ctx,
1743 TALLOC_CTX *mem_ctx,
1744 krb5_const_principal principal,
1745 unsigned flags,
1746 struct sdb_entry_ex *entry_ex) {
1747 struct ldb_dn *realm_dn;
1748 krb5_error_code ret;
1749 struct ldb_message *msg = NULL;
1750
1751 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1752 mem_ctx, principal, user_attrs,
1753 &realm_dn, &msg);
1754 if (ret != 0) {
1755 return ret;
1756 }
1757
1758 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1759 principal, SAMBA_KDC_ENT_TYPE_CLIENT,
1760 flags,
1761 realm_dn, msg, entry_ex);
1762 return ret;
1763 }
1764
1765 static krb5_error_code samba_kdc_fetch_krbtgt(krb5_context context,
1766 struct samba_kdc_db_context *kdc_db_ctx,
1767 TALLOC_CTX *mem_ctx,
1768 krb5_const_principal principal,
1769 unsigned flags,
1770 uint32_t kvno,
1771 struct sdb_entry_ex *entry_ex)
1772 {
1773 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1774 krb5_error_code ret;
1775 struct ldb_message *msg = NULL;
1776 struct ldb_dn *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1777 char *realm_from_princ, *realm_from_princ_malloc;
1778 char *realm_princ_comp = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 1);
1779
1780 realm_from_princ_malloc = smb_krb5_principal_get_realm(context, principal);
1781 if (realm_from_princ_malloc == NULL) {
1782 /* can't happen */
1783 return SDB_ERR_NOENTRY;
1784 }
1785 realm_from_princ = talloc_strdup(mem_ctx, realm_from_princ_malloc);
1786 free(realm_from_princ_malloc);
1787 if (realm_from_princ == NULL) {
1788 return SDB_ERR_NOENTRY;
1789 }
1790
1791 if (krb5_princ_size(context, principal) != 2
1792 || (principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME) != 0)) {
1793 /* Not a krbtgt */
1794 return SDB_ERR_NOENTRY;
1795 }
1796
1797 /* krbtgt case. Either us or a trusted realm */
1798
1799 if (lpcfg_is_my_domain_or_realm(lp_ctx, realm_from_princ)
1800 && lpcfg_is_my_domain_or_realm(lp_ctx, realm_princ_comp)) {
1801 /* us, or someone quite like us */
1802 /* Cludge, cludge cludge. If the realm part of krbtgt/realm,
1803 * is in our db, then direct the caller at our primary
1804 * krbtgt */
1805
1806 int lret;
1807 unsigned int krbtgt_number;
1808 /* w2k8r2 sometimes gives us a kvno of 255 for inter-domain
1809 trust tickets. We don't yet know what this means, but we do
1810 seem to need to treat it as unspecified */
1811 if (flags & SDB_F_KVNO_SPECIFIED) {
1812 krbtgt_number = SAMBA_KVNO_GET_KRBTGT(kvno);
1813 if (kdc_db_ctx->rodc) {
1814 if (krbtgt_number != kdc_db_ctx->my_krbtgt_number) {
1815 return SDB_ERR_NOT_FOUND_HERE;
1816 }
1817 }
1818 } else {
1819 krbtgt_number = kdc_db_ctx->my_krbtgt_number;
1820 }
1821
1822 if (krbtgt_number == kdc_db_ctx->my_krbtgt_number) {
1823 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1824 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
1825 krbtgt_attrs, DSDB_SEARCH_NO_GLOBAL_CATALOG,
1826 "(objectClass=user)");
1827 } else {
1828 /* We need to look up an RODC krbtgt (perhaps
1829 * ours, if we are an RODC, perhaps another
1830 * RODC if we are a read-write DC */
1831 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1832 &msg, realm_dn, LDB_SCOPE_SUBTREE,
1833 krbtgt_attrs,
1834 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1835 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=%u))", (unsigned)(krbtgt_number));
1836 }
1837
1838 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1839 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1840 (unsigned)(krbtgt_number));
1841 krb5_set_error_message(context, SDB_ERR_NOENTRY,
1842 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1843 (unsigned)(krbtgt_number));
1844 return SDB_ERR_NOENTRY;
1845 } else if (lret != LDB_SUCCESS) {
1846 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1847 (unsigned)(krbtgt_number));
1848 krb5_set_error_message(context, SDB_ERR_NOENTRY,
1849 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1850 (unsigned)(krbtgt_number));
1851 return SDB_ERR_NOENTRY;
1852 }
1853
1854 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1855 principal, SAMBA_KDC_ENT_TYPE_KRBTGT,
1856 flags, realm_dn, msg, entry_ex);
1857 if (ret != 0) {
1858 krb5_warnx(context, "samba_kdc_fetch: self krbtgt message2entry failed");
1859 }
1860 return ret;
1861
1862 } else {
1863 enum trust_direction direction = UNKNOWN;
1864 const char *realm = NULL;
1865
1866 /* Either an inbound or outbound trust */
1867
1868 if (strcasecmp(lpcfg_realm(lp_ctx), realm_from_princ) == 0) {
1869 /* look for inbound trust */
1870 direction = INBOUND;
1871 realm = realm_princ_comp;
1872 } else if (principal_comp_strcasecmp(context, principal, 1, lpcfg_realm(lp_ctx)) == 0) {
1873 /* look for outbound trust */
1874 direction = OUTBOUND;
1875 realm = realm_from_princ;
1876 } else {
1877 krb5_warnx(context, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1878 realm_from_princ,
1879 realm_princ_comp);
1880 krb5_set_error_message(context, SDB_ERR_NOENTRY, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1881 realm_from_princ,
1882 realm_princ_comp);
1883 return SDB_ERR_NOENTRY;
1884 }
1885
1886 /* Trusted domains are under CN=system */
1887
1888 ret = samba_kdc_lookup_trust(context, kdc_db_ctx->samdb,
1889 mem_ctx,
1890 realm, realm_dn, &msg);
1891
1892 if (ret != 0) {
1893 krb5_warnx(context, "samba_kdc_fetch: could not find principal in DB");
1894 krb5_set_error_message(context, ret, "samba_kdc_fetch: could not find principal in DB");
1895 return ret;
1896 }
1897
1898 ret = samba_kdc_trust_message2entry(context, kdc_db_ctx, mem_ctx,
1899 principal, direction,
1900 realm_dn, flags, kvno, msg, entry_ex);
1901 if (ret != 0) {
1902 krb5_warnx(context, "samba_kdc_fetch: trust_message2entry failed for %s",
1903 ldb_dn_get_linearized(msg->dn));
1904 krb5_set_error_message(context, ret, "samba_kdc_fetch: "
1905 "trust_message2entry failed for %s",
1906 ldb_dn_get_linearized(msg->dn));
1907 }
1908 return ret;
1909 }
1910
1911 }
1912
1913 static krb5_error_code samba_kdc_lookup_server(krb5_context context,
1914 struct samba_kdc_db_context *kdc_db_ctx,
1915 TALLOC_CTX *mem_ctx,
1916 krb5_const_principal principal,
1917 unsigned flags,
1918 const char **attrs,
1919 struct ldb_dn **realm_dn,
1920 struct ldb_message **msg)
1921 {
1922 krb5_error_code ret;
1923 if ((smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL)
1924 && krb5_princ_size(context, principal) >= 2) {
1925 /* 'normal server' case */
1926 int ldb_ret;
1927 NTSTATUS nt_status;
1928 struct ldb_dn *user_dn;
1929 char *principal_string;
1930
1931 ret = krb5_unparse_name_flags(context, principal,
1932 KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1933 &principal_string);
1934 if (ret != 0) {
1935 return ret;
1936 }
1937
1938 /* At this point we may find the host is known to be
1939 * in a different realm, so we should generate a
1940 * referral instead */
1941 nt_status = crack_service_principal_name(kdc_db_ctx->samdb,
1942 mem_ctx, principal_string,
1943 &user_dn, realm_dn);
1944 free(principal_string);
1945
1946 if (!NT_STATUS_IS_OK(nt_status)) {
1947 return SDB_ERR_NOENTRY;
1948 }
1949
1950 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb,
1951 mem_ctx,
1952 msg, user_dn, LDB_SCOPE_BASE,
1953 attrs,
1954 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1955 "(objectClass=*)");
1956 if (ldb_ret != LDB_SUCCESS) {
1957 return SDB_ERR_NOENTRY;
1958 }
1959 return 0;
1960 } else if (!(flags & SDB_F_FOR_AS_REQ)
1961 && smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1962 /*
1963 * The behaviour of accepting an
1964 * KRB5_NT_ENTERPRISE_PRINCIPAL server principal
1965 * containing a UPN only applies to TGS-REQ packets,
1966 * not AS-REQ packets.
1967 */
1968 return samba_kdc_lookup_client(context, kdc_db_ctx,
1969 mem_ctx, principal, attrs,
1970 realm_dn, msg);
1971 } else {
1972 /*
1973 * This case is for:
1974 * - the AS-REQ, where we only accept
1975 * samAccountName based lookups for the server, no
1976 * matter if the name is an
1977 * KRB5_NT_ENTERPRISE_PRINCIPAL or not
1978 * - for the TGS-REQ when we are not given an
1979 * KRB5_NT_ENTERPRISE_PRINCIPAL, which also must
1980 * only lookup samAccountName based names.
1981 */
1982 int lret;
1983 char *short_princ;
1984 krb5_principal enterprise_principal = NULL;
1985 krb5_const_principal used_principal = NULL;
1986 char *name1 = NULL;
1987 size_t len1 = 0;
1988 char *filter = NULL;
1989
1990 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1991 char *str = NULL;
1992 /* Need to reparse the enterprise principal to find the real target */
1993 if (krb5_princ_size(context, principal) != 1) {
1994 ret = KRB5_PARSE_MALFORMED;
1995 krb5_set_error_message(context, ret, "samba_kdc_lookup_server: request for an "
1996 "enterprise principal with wrong (%d) number of components",
1997 krb5_princ_size(context, principal));
1998 return ret;
1999 }
2000 str = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 0);
2001 if (str == NULL) {
2002 return KRB5_PARSE_MALFORMED;
2003 }
2004 ret = krb5_parse_name(context, str,
2005 &enterprise_principal);
2006 talloc_free(str);
2007 if (ret) {
2008 return ret;
2009 }
2010 used_principal = enterprise_principal;
2011 } else {
2012 used_principal = principal;
2013 }
2014
2015 /* server as client principal case, but we must not lookup userPrincipalNames */
2016 *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
2017
2018 /* TODO: Check if it is our realm, otherwise give referral */
2019
2020 ret = krb5_unparse_name_flags(context, used_principal,
2021 KRB5_PRINCIPAL_UNPARSE_NO_REALM |
2022 KRB5_PRINCIPAL_UNPARSE_DISPLAY,
2023 &short_princ);
2024 used_principal = NULL;
2025 krb5_free_principal(context, enterprise_principal);
2026 enterprise_principal = NULL;
2027
2028 if (ret != 0) {
2029 krb5_set_error_message(context, ret, "samba_kdc_lookup_principal: could not parse principal");
2030 krb5_warnx(context, "samba_kdc_lookup_principal: could not parse principal");
2031 return ret;
2032 }
2033
2034 name1 = ldb_binary_encode_string(mem_ctx, short_princ);
2035 SAFE_FREE(short_princ);
2036 if (name1 == NULL) {
2037 return ENOMEM;
2038 }
2039 len1 = strlen(name1);
2040 if (len1 >= 1 && name1[len1 - 1] != '$') {
2041 filter = talloc_asprintf(mem_ctx,
2042 "(&(objectClass=user)(|(samAccountName=%s)(samAccountName=%s$)))",
2043 name1, name1);
2044 if (filter == NULL) {
2045 return ENOMEM;
2046 }
2047 } else {
2048 filter = talloc_asprintf(mem_ctx,
2049 "(&(objectClass=user)(samAccountName=%s))",
2050 name1);
2051 if (filter == NULL) {
2052 return ENOMEM;
2053 }
2054 }
2055
2056 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx, msg,
2057 *realm_dn, LDB_SCOPE_SUBTREE,
2058 attrs,
2059 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
2060 "%s", filter);
2061 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
2062 DEBUG(10, ("Failed to find an entry for %s filter:%s\n",
2063 name1, filter));
2064 return SDB_ERR_NOENTRY;
2065 }
2066 if (lret == LDB_ERR_CONSTRAINT_VIOLATION) {
2067 DEBUG(10, ("Failed to find unique entry for %s filter:%s\n",
2068 name1, filter));
2069 return SDB_ERR_NOENTRY;
2070 }
2071 if (lret != LDB_SUCCESS) {
2072 DEBUG(0, ("Failed single search for %s - %s\n",
2073 name1, ldb_errstring(kdc_db_ctx->samdb)));
2074 return SDB_ERR_NOENTRY;
2075 }
2076 return 0;
2077 }
2078 return SDB_ERR_NOENTRY;
2079 }
2080
2081
2082
2083 static krb5_error_code samba_kdc_fetch_server(krb5_context context,
2084 struct samba_kdc_db_context *kdc_db_ctx,
2085 TALLOC_CTX *mem_ctx,
2086 krb5_const_principal principal,
2087 unsigned flags,
2088 struct sdb_entry_ex *entry_ex)
2089 {
2090 krb5_error_code ret;
2091 struct ldb_dn *realm_dn;
2092 struct ldb_message *msg;
2093
2094 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, principal,
2095 flags, server_attrs, &realm_dn, &msg);
2096 if (ret != 0) {
2097 return ret;
2098 }
2099
2100 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
2101 principal, SAMBA_KDC_ENT_TYPE_SERVER,
2102 flags,
2103 realm_dn, msg, entry_ex);
2104 if (ret != 0) {
2105 krb5_warnx(context, "samba_kdc_fetch: message2entry failed");
2106 }
2107
2108 return ret;
2109 }
2110
2111 static krb5_error_code samba_kdc_lookup_realm(krb5_context context,
2112 struct samba_kdc_db_context *kdc_db_ctx,
2113 TALLOC_CTX *mem_ctx,
2114 krb5_const_principal principal,
2115 unsigned flags,
2116 struct sdb_entry_ex *entry_ex)
2117 {
2118 TALLOC_CTX *frame = talloc_stackframe();
2119 NTSTATUS status;
2120 krb5_error_code ret;
2121 char *_realm = NULL;
2122 bool check_realm = false;
2123 const char *realm = NULL;
2124 struct dsdb_trust_routing_table *trt = NULL;
2125 const struct lsa_TrustDomainInfoInfoEx *tdo = NULL;
2126 unsigned int num_comp;
2127 bool ok;
2128 char *upper = NULL;
2129
2130 num_comp = krb5_princ_size(context, principal);
2131
2132 if (flags & SDB_F_GET_CLIENT) {
2133 if (flags & SDB_F_FOR_AS_REQ) {
2134 check_realm = true;
2135 }
2136 }
2137 if (flags & SDB_F_GET_SERVER) {
2138 if (flags & SDB_F_FOR_TGS_REQ) {
2139 check_realm = true;
2140 }
2141 }
2142
2143 if (!check_realm) {
2144 TALLOC_FREE(frame);
2145 return 0;
2146 }
2147
2148 _realm = smb_krb5_principal_get_realm(context, principal);
2149 if (_realm == NULL) {
2150 TALLOC_FREE(frame);
2151 return ENOMEM;
2152 }
2153
2154 /*
2155 * The requested realm needs to be our own
2156 */
2157 ok = lpcfg_is_my_domain_or_realm(kdc_db_ctx->lp_ctx, _realm);
2158 if (!ok) {
2159 /*
2160 * The request is not for us...
2161 */
2162 SAFE_FREE(_realm);
2163 TALLOC_FREE(frame);
2164 return SDB_ERR_NOENTRY;
2165 }
2166
2167 realm = talloc_strdup(frame, _realm);
2168 SAFE_FREE(_realm);
2169 if (realm == NULL) {
2170 TALLOC_FREE(frame);
2171 return ENOMEM;
2172 }
2173
2174 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
2175 char *principal_string = NULL;
2176 krb5_principal enterprise_principal = NULL;
2177 char *enterprise_realm = NULL;
2178
2179 if (num_comp != 1) {
2180 TALLOC_FREE(frame);
2181 return SDB_ERR_NOENTRY;
2182 }
2183
2184 principal_string = smb_krb5_principal_get_comp_string(frame, context,
2185 principal, 0);
2186 if (principal_string == NULL) {
2187 TALLOC_FREE(frame);
2188 return ENOMEM;
2189 }
2190
2191 ret = krb5_parse_name(context, principal_string,
2192 &enterprise_principal);
2193 TALLOC_FREE(principal_string);
2194 if (ret) {
2195 TALLOC_FREE(frame);
2196 return ret;
2197 }
2198
2199 enterprise_realm = smb_krb5_principal_get_realm(context,
2200 enterprise_principal);
2201 krb5_free_principal(context, enterprise_principal);
2202 if (enterprise_realm != NULL) {
2203 realm = talloc_strdup(frame, enterprise_realm);
2204 SAFE_FREE(enterprise_realm);
2205 if (realm == NULL) {
2206 TALLOC_FREE(frame);
2207 return ENOMEM;
2208 }
2209 }
2210 }
2211
2212 if (flags & SDB_F_GET_SERVER) {
2213 char *service_realm = NULL;
2214
2215 ret = principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME);
2216 if (ret == 0) {
2217 /*
2218 * we need to search krbtgt/ locally
2219 */
2220 TALLOC_FREE(frame);
2221 return 0;
2222 }
2223
2224 /*
2225 * We need to check the last component against the routing table.
2226 *
2227 * Note this works only with 2 or 3 component principals, e.g:
2228 *
2229 * servicePrincipalName: ldap/W2K8R2-219.bla.base
2230 * servicePrincipalName: ldap/W2K8R2-219.bla.base/bla.base
2231 * servicePrincipalName: ldap/W2K8R2-219.bla.base/ForestDnsZones.bla.base
2232 * servicePrincipalName: ldap/W2K8R2-219.bla.base/DomainDnsZones.bla.base
2233 */
2234
2235 if (num_comp == 2 || num_comp == 3) {
2236 service_realm = smb_krb5_principal_get_comp_string(frame,
2237 context,
2238 principal,
2239 num_comp - 1);
2240 }
2241
2242 if (service_realm != NULL) {
2243 realm = service_realm;
2244 }
2245 }
2246
2247 ok = lpcfg_is_my_domain_or_realm(kdc_db_ctx->lp_ctx, realm);
2248 if (ok) {
2249 /*
2250 * skip the expensive routing lookup
2251 */
2252 TALLOC_FREE(frame);
2253 return 0;
2254 }
2255
2256 status = dsdb_trust_routing_table_load(kdc_db_ctx->samdb,
2257 frame, &trt);
2258 if (!NT_STATUS_IS_OK(status)) {
2259 TALLOC_FREE(frame);
2260 return EINVAL;
2261 }
2262
2263 tdo = dsdb_trust_routing_by_name(trt, realm);
2264 if (tdo == NULL) {
2265 /*
2266 * This principal has to be local
2267 */
2268 TALLOC_FREE(frame);
2269 return 0;
2270 }
2271
2272 if (tdo->trust_attributes & LSA_TRUST_ATTRIBUTE_WITHIN_FOREST) {
2273 /*
2274 * TODO: handle the routing within the forest
2275 *
2276 * This should likely be handled in
2277 * samba_kdc_message2entry() in case we're
2278 * a global catalog. We'd need to check
2279 * if realm_dn is our own domain and derive
2280 * the dns domain name from realm_dn and check that
2281 * against the routing table or fallback to
2282 * the tdo we found here.
2283 *
2284 * But for now we don't support multiple domains
2285 * in our forest correctly anyway.
2286 *
2287 * Just search in our local database.
2288 */
2289 TALLOC_FREE(frame);
2290 return 0;
2291 }
2292
2293 ZERO_STRUCT(entry_ex->entry);
2294
2295 ret = krb5_copy_principal(context, principal,
2296 &entry_ex->entry.principal);
2297 if (ret) {
2298 TALLOC_FREE(frame);
2299 return ret;
2300 }
2301
2302 upper = strupper_talloc(frame, tdo->domain_name.string);
2303 if (upper == NULL) {
2304 TALLOC_FREE(frame);
2305 return ENOMEM;
2306 }
2307
2308 ret = smb_krb5_principal_set_realm(context,
2309 entry_ex->entry.principal,
2310 upper);
2311 if (ret) {
2312 TALLOC_FREE(frame);
2313 return ret;
2314 }
2315
2316 TALLOC_FREE(frame);
2317 return SDB_ERR_WRONG_REALM;
2318 }
2319
2320 krb5_error_code samba_kdc_fetch(krb5_context context,
2321 struct samba_kdc_db_context *kdc_db_ctx,
2322 krb5_const_principal principal,
2323 unsigned flags,
2324 krb5_kvno kvno,
2325 struct sdb_entry_ex *entry_ex)
2326 {
2327 krb5_error_code ret = SDB_ERR_NOENTRY;
2328 TALLOC_CTX *mem_ctx;
2329
2330 mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_fetch context");
2331 if (!mem_ctx) {
2332 ret = ENOMEM;
2333 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2334 return ret;
2335 }
2336
2337 ret = samba_kdc_lookup_realm(context, kdc_db_ctx, mem_ctx,
2338 principal, flags, entry_ex);
2339 if (ret != 0) {
2340 goto done;
2341 }
2342
2343 ret = SDB_ERR_NOENTRY;
2344
2345 if (flags & SDB_F_GET_CLIENT) {
2346 ret = samba_kdc_fetch_client(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
2347 if (ret != SDB_ERR_NOENTRY) goto done;
2348 }
2349 if (flags & SDB_F_GET_SERVER) {
2350 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
2351 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
2352 if (ret != SDB_ERR_NOENTRY) goto done;
2353
2354 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
2355 ret = samba_kdc_fetch_server(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
2356 if (ret != SDB_ERR_NOENTRY) goto done;
2357 }
2358 if (flags & SDB_F_GET_KRBTGT) {
2359 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
2360 if (ret != SDB_ERR_NOENTRY) goto done;
2361 }
2362
2363 done:
2364 talloc_free(mem_ctx);
2365 return ret;
2366 }
2367
2368 struct samba_kdc_seq {
2369 unsigned int index;
2370 unsigned int count;
2371 struct ldb_message **msgs;
2372 struct ldb_dn *realm_dn;
2373 };
2374
2375 static krb5_error_code samba_kdc_seq(krb5_context context,
2376 struct samba_kdc_db_context *kdc_db_ctx,
2377 struct sdb_entry_ex *entry)
2378 {
2379 krb5_error_code ret;
2380 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
2381 const char *realm = lpcfg_realm(kdc_db_ctx->lp_ctx);
2382 struct ldb_message *msg = NULL;
2383 const char *sAMAccountName = NULL;
2384 krb5_principal principal = NULL;
2385 TALLOC_CTX *mem_ctx;
2386
2387 if (!priv) {
2388 return SDB_ERR_NOENTRY;
2389 }
2390
2391 mem_ctx = talloc_named(priv, 0, "samba_kdc_seq context");
2392
2393 if (!mem_ctx) {
2394 ret = ENOMEM;
2395 krb5_set_error_message(context, ret, "samba_kdc_seq: talloc_named() failed!");
2396 return ret;
2397 }
2398
2399 while (priv->index < priv->count) {
2400 msg = priv->msgs[priv->index++];
2401
2402 sAMAccountName = ldb_msg_find_attr_as_string(msg, "sAMAccountName", NULL);
2403 if (sAMAccountName != NULL) {
2404 break;
2405 }
2406 }
2407
2408 if (sAMAccountName == NULL) {
2409 ret = SDB_ERR_NOENTRY;
2410 goto out;
2411 }
2412
2413 ret = smb_krb5_make_principal(context, &principal,
2414 realm, sAMAccountName, NULL);
2415 if (ret != 0) {
2416 goto out;
2417 }
2418
2419 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
2420 principal, SAMBA_KDC_ENT_TYPE_ANY,
2421 SDB_F_ADMIN_DATA|SDB_F_GET_ANY,
2422 priv->realm_dn, msg, entry);
2423
2424 out:
2425 if (principal != NULL) {
2426 krb5_free_principal(context, principal);
2427 }
2428
2429 if (ret != 0) {
2430 TALLOC_FREE(priv);
2431 kdc_db_ctx->seq_ctx = NULL;
2432 } else {
2433 talloc_free(mem_ctx);
2434 }
2435
2436 return ret;
2437 }
2438
2439 krb5_error_code samba_kdc_firstkey(krb5_context context,
2440 struct samba_kdc_db_context *kdc_db_ctx,
2441 struct sdb_entry_ex *entry)
2442 {
2443 struct ldb_context *ldb_ctx = kdc_db_ctx->samdb;
2444 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
2445 char *realm;
2446 struct ldb_result *res = NULL;
2447 krb5_error_code ret;
2448 TALLOC_CTX *mem_ctx;
2449 int lret;
2450
2451 if (priv) {
2452 TALLOC_FREE(priv);
2453 kdc_db_ctx->seq_ctx = NULL;
2454 }
2455
2456 priv = (struct samba_kdc_seq *) talloc(kdc_db_ctx, struct samba_kdc_seq);
2457 if (!priv) {
2458 ret = ENOMEM;
2459 krb5_set_error_message(context, ret, "talloc: out of memory");
2460 return ret;
2461 }
2462
2463 priv->index = 0;
2464 priv->msgs = NULL;
2465 priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
2466 priv->count = 0;
2467
2468 mem_ctx = talloc_named(priv, 0, "samba_kdc_firstkey context");
2469
2470 if (!mem_ctx) {
2471 ret = ENOMEM;
2472 krb5_set_error_message(context, ret, "samba_kdc_firstkey: talloc_named() failed!");
2473 return ret;
2474 }
2475
2476 ret = krb5_get_default_realm(context, &realm);
2477 if (ret != 0) {
2478 TALLOC_FREE(priv);
2479 return ret;
2480 }
2481 krb5_free_default_realm(context, realm);
2482
2483 lret = dsdb_search(ldb_ctx, priv, &res,
2484 priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
2485 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2486 "(objectClass=user)");
2487
2488 if (lret != LDB_SUCCESS) {
2489 TALLOC_FREE(priv);
2490 return SDB_ERR_NOENTRY;
2491 }
2492
2493 priv->count = res->count;
2494 priv->msgs = talloc_steal(priv, res->msgs);
2495 talloc_free(res);
2496
2497 kdc_db_ctx->seq_ctx = priv;
2498
2499 ret = samba_kdc_seq(context, kdc_db_ctx, entry);
2500
2501 if (ret != 0) {
2502 TALLOC_FREE(priv);
2503 kdc_db_ctx->seq_ctx = NULL;
2504 } else {
2505 talloc_free(mem_ctx);
2506 }
2507 return ret;
2508 }
2509
2510 krb5_error_code samba_kdc_nextkey(krb5_context context,
2511 struct samba_kdc_db_context *kdc_db_ctx,
2512 struct sdb_entry_ex *entry)
2513 {
2514 return samba_kdc_seq(context, kdc_db_ctx, entry);
2515 }
2516
2517 /* Check if a given entry may delegate or do s4u2self to this target principal
2518 *
2519 * This is currently a very nasty hack - allowing only delegation to itself.
2520 */
2521 krb5_error_code
2522 samba_kdc_check_s4u2self(krb5_context context,
2523 struct samba_kdc_db_context *kdc_db_ctx,
2524 struct samba_kdc_entry *skdc_entry,
2525 krb5_const_principal target_principal)
2526 {
2527 krb5_error_code ret;
2528 struct ldb_dn *realm_dn;
2529 struct ldb_message *msg;
2530 struct dom_sid *orig_sid;
2531 struct dom_sid *target_sid;
2532 const char *delegation_check_attrs[] = {
2533 "objectSid", NULL
2534 };
2535
2536 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2self");
2537
2538 if (!mem_ctx) {
2539 ret = ENOMEM;
2540 krb5_set_error_message(context, ret, "samba_kdc_check_s4u2self: talloc_named() failed!");
2541 return ret;
2542 }
2543
2544 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, target_principal,
2545 SDB_F_GET_CLIENT|SDB_F_GET_SERVER,
2546 delegation_check_attrs, &realm_dn, &msg);
2547
2548 if (ret != 0) {
2549 talloc_free(mem_ctx);
2550 return ret;
2551 }
2552
2553 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2554 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2555
2556 /* Allow delegation to the same principal, even if by a different
2557 * name. The easy and safe way to prove this is by SID
2558 * comparison */
2559 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2560 talloc_free(mem_ctx);
2561 return KRB5KDC_ERR_BADOPTION;
2562 }
2563
2564 talloc_free(mem_ctx);
2565 return ret;
2566 }
2567
2568 /* Certificates printed by a the Certificate Authority might have a
2569 * slightly different form of the user principal name to that in the
2570 * database. Allow a mismatch where they both refer to the same
2571 * SID */
2572
2573 krb5_error_code
2574 samba_kdc_check_pkinit_ms_upn_match(krb5_context context,
2575 struct samba_kdc_db_context *kdc_db_ctx,
2576 struct samba_kdc_entry *skdc_entry,
2577 krb5_const_principal certificate_principal)
2578 {
2579 krb5_error_code ret;
2580 struct ldb_dn *realm_dn;
2581 struct ldb_message *msg;
2582 struct dom_sid *orig_sid;
2583 struct dom_sid *target_sid;
2584 const char *ms_upn_check_attrs[] = {
2585 "objectSid", NULL
2586 };
2587
2588 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_pkinit_ms_upn_match");
2589
2590 if (!mem_ctx) {
2591 ret = ENOMEM;
2592 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2593 return ret;
2594 }
2595
2596 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
2597 mem_ctx, certificate_principal,
2598 ms_upn_check_attrs, &realm_dn, &msg);
2599
2600 if (ret != 0) {
2601 talloc_free(mem_ctx);
2602 return ret;
2603 }
2604
2605 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2606 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2607
2608 /* Consider these to be the same principal, even if by a different
2609 * name. The easy and safe way to prove this is by SID
2610 * comparison */
2611 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2612 talloc_free(mem_ctx);
2613 #ifdef KRB5_KDC_ERR_CLIENT_NAME_MISMATCH /* Heimdal */
2614 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
2615 #elif defined(KRB5KDC_ERR_CLIENT_NAME_MISMATCH) /* MIT */
2616 return KRB5KDC_ERR_CLIENT_NAME_MISMATCH;
2617 #endif
2618 }
2619
2620 talloc_free(mem_ctx);
2621 return ret;
2622 }
2623
2624 /*
2625 * Check if a given entry may delegate to this target principal
2626 * with S4U2Proxy.
2627 */
2628 krb5_error_code
2629 samba_kdc_check_s4u2proxy(krb5_context context,
2630 struct samba_kdc_db_context *kdc_db_ctx,
2631 struct samba_kdc_entry *skdc_entry,
2632 krb5_const_principal target_principal)
2633 {
2634 krb5_error_code ret;
2635 char *tmp = NULL;
2636 const char *client_dn = NULL;
2637 const char *target_principal_name = NULL;
2638 struct ldb_message_element *el;
2639 struct ldb_val val;
2640 unsigned int i;
2641 bool found = false;
2642
2643 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2proxy");
2644
2645 if (!mem_ctx) {
2646 ret = ENOMEM;
2647 krb5_set_error_message(context, ret,
2648 "samba_kdc_check_s4u2proxy:"
2649 " talloc_named() failed!");
2650 return ret;
2651 }
2652
2653 client_dn = ldb_dn_get_linearized(skdc_entry->msg->dn);
2654 if (!client_dn) {
2655 if (errno == 0) {
2656 errno = ENOMEM;
2657 }
2658 ret = errno;
2659 krb5_set_error_message(context, ret,
2660 "samba_kdc_check_s4u2proxy:"
2661 " ldb_dn_get_linearized() failed!");
2662 return ret;
2663 }
2664
2665 /*
2666 * The main heimdal code already checked that the target_principal
2667 * belongs to the same realm as the client.
2668 *
2669 * So we just need the principal without the realm,
2670 * as that is what is configured in the "msDS-AllowedToDelegateTo"
2671 * attribute.
2672 */
2673 ret = krb5_unparse_name_flags(context, target_principal,
2674 KRB5_PRINCIPAL_UNPARSE_NO_REALM, &tmp);
2675 if (ret) {
2676 talloc_free(mem_ctx);
2677 krb5_set_error_message(context, ret,
2678 "samba_kdc_check_s4u2proxy:"
2679 " krb5_unparse_name() failed!");
2680 return ret;
2681 }
2682 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] for target[%s]\n",
2683 client_dn, tmp));
2684
2685 target_principal_name = talloc_strdup(mem_ctx, tmp);
2686 SAFE_FREE(tmp);
2687 if (target_principal_name == NULL) {
2688 ret = ENOMEM;
2689 krb5_set_error_message(context, ret,
2690 "samba_kdc_check_s4u2proxy:"
2691 " talloc_strdup() failed!");
2692 return ret;
2693 }
2694
2695 el = ldb_msg_find_element(skdc_entry->msg, "msDS-AllowedToDelegateTo");
2696 if (el == NULL) {
2697 goto bad_option;
2698 }
2699
2700 val = data_blob_string_const(target_principal_name);
2701
2702 for (i=0; i<el->num_values; i++) {
2703 struct ldb_val *val1 = &val;
2704 struct ldb_val *val2 = &el->values[i];
2705 int cmp;
2706
2707 if (val1->length != val2->length) {
2708 continue;
2709 }
2710
2711 cmp = strncasecmp((const char *)val1->data,
2712 (const char *)val2->data,
2713 val1->length);
2714 if (cmp != 0) {
2715 continue;
2716 }
2717
2718 found = true;
2719 break;
2720 }
2721
2722 if (!found) {
2723 goto bad_option;
2724 }
2725
2726 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] allowed target[%s]\n",
2727 client_dn, tmp));
2728 talloc_free(mem_ctx);
2729 return 0;
2730
2731 bad_option:
2732 krb5_set_error_message(context, ret,
2733 "samba_kdc_check_s4u2proxy: client[%s] "
2734 "not allowed for delegation to target[%s]",
2735 client_dn,
2736 target_principal_name);
2737 talloc_free(mem_ctx);
2738 return KRB5KDC_ERR_BADOPTION;
2739 }
2740
2741 NTSTATUS samba_kdc_setup_db_ctx(TALLOC_CTX *mem_ctx, struct samba_kdc_base_context *base_ctx,
2742 struct samba_kdc_db_context **kdc_db_ctx_out)
2743 {
2744 int ldb_ret;
2745 struct ldb_message *msg;
2746 struct auth_session_info *session_info;
2747 struct samba_kdc_db_context *kdc_db_ctx;
2748 /* The idea here is very simple. Using Kerberos to
2749 * authenticate the KDC to the LDAP server is higly likely to
2750 * be circular.
2751 *
2752 * In future we may set this up to use EXERNAL and SSL
2753 * certificates, for now it will almost certainly be NTLMSSP_SET_USERNAME
2754 */
2755
2756 kdc_db_ctx = talloc_zero(mem_ctx, struct samba_kdc_db_context);
2757 if (kdc_db_ctx == NULL) {
2758 return NT_STATUS_NO_MEMORY;
2759 }
2760 kdc_db_ctx->ev_ctx = base_ctx->ev_ctx;
2761 kdc_db_ctx->lp_ctx = base_ctx->lp_ctx;
2762 kdc_db_ctx->msg_ctx = base_ctx->msg_ctx;
2763
2764 /* get default kdc policy */
2765 lpcfg_default_kdc_policy(mem_ctx,
2766 base_ctx->lp_ctx,
2767 &kdc_db_ctx->policy.svc_tkt_lifetime,
2768 &kdc_db_ctx->policy.usr_tkt_lifetime,
2769 &kdc_db_ctx->policy.renewal_lifetime);
2770
2771 session_info = system_session(kdc_db_ctx->lp_ctx);
2772 if (session_info == NULL) {
2773 return NT_STATUS_INTERNAL_ERROR;
2774 }
2775
2776 /* Setup the link to LDB */
2777 kdc_db_ctx->samdb = samdb_connect(kdc_db_ctx,
2778 base_ctx->ev_ctx,
2779 base_ctx->lp_ctx,
2780 session_info,
2781 NULL,
2782 0);
2783 if (kdc_db_ctx->samdb == NULL) {
2784 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot open samdb for KDC backend!"));
2785 talloc_free(kdc_db_ctx);
2786 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2787 }
2788
2789 /* Find out our own krbtgt kvno */
2790 ldb_ret = samdb_rodc(kdc_db_ctx->samdb, &kdc_db_ctx->rodc);
2791 if (ldb_ret != LDB_SUCCESS) {
2792 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine if we are an RODC in KDC backend: %s\n",
2793 ldb_errstring(kdc_db_ctx->samdb)));
2794 talloc_free(kdc_db_ctx);
2795 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2796 }
2797 if (kdc_db_ctx->rodc) {
2798 int my_krbtgt_number;
2799 const char *secondary_keytab[] = { "msDS-SecondaryKrbTgtNumber", NULL };
2800 struct ldb_dn *account_dn;
2801 struct ldb_dn *server_dn = samdb_server_dn(kdc_db_ctx->samdb, kdc_db_ctx);
2802 if (!server_dn) {
2803 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server DN in KDC backend: %s\n",
2804 ldb_errstring(kdc_db_ctx->samdb)));
2805 talloc_free(kdc_db_ctx);
2806 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2807 }
2808
2809 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, server_dn,
2810 "serverReference", &account_dn);
2811 if (ldb_ret != LDB_SUCCESS) {
2812 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server account in KDC backend: %s\n",
2813 ldb_errstring(kdc_db_ctx->samdb)));
2814 talloc_free(kdc_db_ctx);
2815 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2816 }
2817
2818 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, account_dn,
2819 "msDS-KrbTgtLink", &kdc_db_ctx->krbtgt_dn);
2820 talloc_free(account_dn);
2821 if (ldb_ret != LDB_SUCCESS) {
2822 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine RODC krbtgt account in KDC backend: %s\n",
2823 ldb_errstring(kdc_db_ctx->samdb)));
2824 talloc_free(kdc_db_ctx);
2825 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2826 }
2827
2828 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2829 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
2830 secondary_keytab,
2831 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2832 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=*))");
2833 if (ldb_ret != LDB_SUCCESS) {
2834 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read krbtgt account %s in KDC backend to get msDS-SecondaryKrbTgtNumber: %s: %s\n",
2835 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2836 ldb_errstring(kdc_db_ctx->samdb),
2837 ldb_strerror(ldb_ret)));
2838 talloc_free(kdc_db_ctx);
2839 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2840 }
2841 my_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
2842 if (my_krbtgt_number == -1) {
2843 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read msDS-SecondaryKrbTgtNumber from krbtgt account %s in KDC backend: got %d\n",
2844 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2845 my_krbtgt_number));
2846 talloc_free(kdc_db_ctx);
2847 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2848 }
2849 kdc_db_ctx->my_krbtgt_number = my_krbtgt_number;
2850
2851 } else {
2852 kdc_db_ctx->my_krbtgt_number = 0;
2853 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2854 &msg,
2855 ldb_get_default_basedn(kdc_db_ctx->samdb),
2856 LDB_SCOPE_SUBTREE,
2857 krbtgt_attrs,
2858 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2859 "(&(objectClass=user)(samAccountName=krbtgt))");
2860
2861 if (ldb_ret != LDB_SUCCESS) {
2862 DEBUG(1, ("samba_kdc_fetch: could not find own KRBTGT in DB: %s\n", ldb_errstring(kdc_db_ctx->samdb)));
2863 talloc_free(kdc_db_ctx);
2864 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2865 }
2866 kdc_db_ctx->krbtgt_dn = talloc_steal(kdc_db_ctx, msg->dn);
2867 kdc_db_ctx->my_krbtgt_number = 0;
2868 talloc_free(msg);
2869 }
2870 *kdc_db_ctx_out = kdc_db_ctx;
2871 return NT_STATUS_OK;
2872 }
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