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CVE-2022-2031 s4:kdc: Limit kpasswd ticket lifetime to two minutes or less
[Samba.git] / source4 / kdc / db-glue.c
blob073ec83c8cf488d891541859174be22b02b4f82c
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 #undef strcasecmp
42 #undef strncasecmp
43
44 #define SAMBA_KVNO_GET_KRBTGT(kvno) \
45 ((uint16_t)(((uint32_t)kvno) >> 16))
46
47 #define SAMBA_KVNO_GET_VALUE(kvno) \
48 ((uint16_t)(((uint32_t)kvno) & 0xFFFF))
49
50 #define SAMBA_KVNO_AND_KRBTGT(kvno, krbtgt) \
51 ((krb5_kvno)((((uint32_t)kvno) & 0xFFFF) | \
52 ((((uint32_t)krbtgt) << 16) & 0xFFFF0000)))
53
54 enum samba_kdc_ent_type
55 { SAMBA_KDC_ENT_TYPE_CLIENT, SAMBA_KDC_ENT_TYPE_SERVER,
56 SAMBA_KDC_ENT_TYPE_KRBTGT, SAMBA_KDC_ENT_TYPE_TRUST, SAMBA_KDC_ENT_TYPE_ANY };
57
58 enum trust_direction {
59 UNKNOWN = 0,
60 INBOUND = LSA_TRUST_DIRECTION_INBOUND,
61 OUTBOUND = LSA_TRUST_DIRECTION_OUTBOUND
62 };
63
64 static const char *trust_attrs[] = {
65 "securityIdentifier",
66 "flatName",
67 "trustPartner",
68 "trustAttributes",
69 "trustDirection",
70 "trustType",
71 "msDS-TrustForestTrustInfo",
72 "trustAuthIncoming",
73 "trustAuthOutgoing",
74 "whenCreated",
75 "msDS-SupportedEncryptionTypes",
76 NULL
77 };
78
79 /*
80 send a message to the drepl server telling it to initiate a
81 REPL_SECRET getncchanges extended op to fetch the users secrets
82 */
83 static void auth_sam_trigger_repl_secret(TALLOC_CTX *mem_ctx,
84 struct imessaging_context *msg_ctx,
85 struct tevent_context *event_ctx,
86 struct ldb_dn *user_dn)
87 {
88 struct dcerpc_binding_handle *irpc_handle;
89 struct drepl_trigger_repl_secret r;
90 struct tevent_req *req;
91 TALLOC_CTX *tmp_ctx;
92
93 tmp_ctx = talloc_new(mem_ctx);
94 if (tmp_ctx == NULL) {
95 return;
96 }
97
98 irpc_handle = irpc_binding_handle_by_name(tmp_ctx, msg_ctx,
99 "dreplsrv",
100 &ndr_table_irpc);
101 if (irpc_handle == NULL) {
102 DEBUG(1,(__location__ ": Unable to get binding handle for dreplsrv\n"));
103 TALLOC_FREE(tmp_ctx);
104 return;
105 }
106
107 r.in.user_dn = ldb_dn_get_linearized(user_dn);
108
109 /*
110 * This seem to rely on the current IRPC implementation,
111 * which delivers the message in the _send function.
112 *
113 * TODO: we need a ONE_WAY IRPC handle and register
114 * a callback and wait for it to be triggered!
115 */
116 req = dcerpc_drepl_trigger_repl_secret_r_send(tmp_ctx,
117 event_ctx,
118 irpc_handle,
119 &r);
120
121 /* we aren't interested in a reply */
122 talloc_free(req);
123 TALLOC_FREE(tmp_ctx);
124 }
125
126 static time_t ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, time_t default_val)
127 {
128 const char *tmp;
129 const char *gentime;
130 struct tm tm;
131
132 gentime = ldb_msg_find_attr_as_string(msg, attr, NULL);
133 if (!gentime)
134 return default_val;
135
136 tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
137 if (tmp == NULL) {
138 return default_val;
139 }
140
141 return timegm(&tm);
142 }
143
144 static struct SDBFlags uf2SDBFlags(krb5_context context, uint32_t userAccountControl, enum samba_kdc_ent_type ent_type)
145 {
146 struct SDBFlags flags = int2SDBFlags(0);
147
148 /* we don't allow kadmin deletes */
149 flags.immutable = 1;
150
151 /* mark the principal as invalid to start with */
152 flags.invalid = 1;
153
154 flags.renewable = 1;
155
156 /* All accounts are servers, but this may be disabled again in the caller */
157 flags.server = 1;
158
159 /* Account types - clear the invalid bit if it turns out to be valid */
160 if (userAccountControl & UF_NORMAL_ACCOUNT) {
161 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
162 flags.client = 1;
163 }
164 flags.invalid = 0;
165 }
166
167 if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
168 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
169 flags.client = 1;
170 }
171 flags.invalid = 0;
172 }
173 if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
174 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
175 flags.client = 1;
176 }
177 flags.invalid = 0;
178 }
179 if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
180 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
181 flags.client = 1;
182 }
183 flags.invalid = 0;
184 }
185
186 /* Not permitted to act as a client if disabled */
187 if (userAccountControl & UF_ACCOUNTDISABLE) {
188 flags.client = 0;
189 }
190 if (userAccountControl & UF_LOCKOUT) {
191 flags.locked_out = 1;
192 }
193 /*
194 if (userAccountControl & UF_PASSWORD_NOTREQD) {
195 flags.invalid = 1;
196 }
197 */
198 /*
199 UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent
200 */
201 if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
202 flags.invalid = 1;
203 }
204
205 /* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in samba_kdc_message2entry() */
206
207 /*
208 if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
209 flags.invalid = 1;
210 }
211 */
212 if (userAccountControl & UF_SMARTCARD_REQUIRED) {
213 flags.require_hwauth = 1;
214 }
215 if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
216 flags.ok_as_delegate = 1;
217 }
218 if (userAccountControl & UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION) {
219 /*
220 * this is confusing...
221 *
222 * UF_TRUSTED_FOR_DELEGATION
223 * => ok_as_delegate
224 *
225 * and
226 *
227 * UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION
228 * => trusted_for_delegation
229 */
230 flags.trusted_for_delegation = 1;
231 }
232 if (!(userAccountControl & UF_NOT_DELEGATED)) {
233 flags.forwardable = 1;
234 flags.proxiable = 1;
235 }
236
237 if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
238 flags.require_preauth = 0;
239 } else {
240 flags.require_preauth = 1;
241
242 }
243 return flags;
244 }
245
246 static int samba_kdc_entry_destructor(struct samba_kdc_entry *p)
247 {
248 if (p->entry_ex != NULL) {
249 struct sdb_entry_ex *entry_ex = p->entry_ex;
250 free_sdb_entry(&entry_ex->entry);
251 }
252
253 return 0;
254 }
255
256 /*
257 * Sort keys in descending order of strength.
258 *
259 * Explanaton from Greg Hudson:
260 *
261 * To encrypt tickets only the first returned key is used by the MIT KDC. The
262 * other keys just communicate support for session key enctypes, and aren't
263 * really used. The encryption key for the ticket enc part doesn't have
264 * to be of a type requested by the client. The session key enctype is chosen
265 * based on the client preference order, limited by the set of enctypes present
266 * in the server keys (unless the string attribute is set on the server
267 * principal overriding that set).
268 */
269 static int samba_kdc_sort_encryption_keys(struct sdb_entry_ex *entry_ex)
270 {
271 unsigned int i, j, idx = 0;
272 static const krb5_enctype etype_list[] = {
273 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
274 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
275 ENCTYPE_DES3_CBC_SHA1,
276 ENCTYPE_ARCFOUR_HMAC,
277 ENCTYPE_DES_CBC_MD5,
278 ENCTYPE_DES_CBC_MD4,
279 ENCTYPE_DES_CBC_CRC,
280 ENCTYPE_NULL
281 };
282 size_t etype_len = ARRAY_SIZE(etype_list);
283 size_t keys_size = entry_ex->entry.keys.len;
284 struct sdb_key *keys = entry_ex->entry.keys.val;
285 struct sdb_key *sorted_keys;
286
287 sorted_keys = calloc(keys_size, sizeof(struct sdb_key));
288 if (sorted_keys == NULL) {
289 return -1;
290 }
291
292 for (i = 0; i < etype_len; i++) {
293 for (j = 0; j < keys_size; j++) {
294 const struct sdb_key skey = keys[j];
295
296 if (idx == keys_size) {
297 break;
298 }
299
300 if (KRB5_KEY_TYPE(&skey.key) == etype_list[i]) {
301 sorted_keys[idx] = skey;
302 idx++;
303 }
304 }
305 }
306
307 /* Paranoia: Something went wrong during data copy */
308 if (idx != keys_size) {
309 free(sorted_keys);
310 return -1;
311 }
312
313 free(entry_ex->entry.keys.val);
314 entry_ex->entry.keys.val = sorted_keys;
315
316 return 0;
317 }
318
319 static krb5_error_code samba_kdc_message2entry_keys(krb5_context context,
320 struct samba_kdc_db_context *kdc_db_ctx,
321 TALLOC_CTX *mem_ctx,
322 struct ldb_message *msg,
323 uint32_t rid,
324 bool is_rodc,
325 uint32_t userAccountControl,
326 enum samba_kdc_ent_type ent_type,
327 struct sdb_entry_ex *entry_ex)
328 {
329 struct sdb_entry *entry = &entry_ex->entry;
330 krb5_error_code ret = 0;
331 enum ndr_err_code ndr_err;
332 struct samr_Password *hash;
333 const struct ldb_val *sc_val;
334 struct supplementalCredentialsBlob scb;
335 struct supplementalCredentialsPackage *scpk = NULL;
336 bool newer_keys = false;
337 struct package_PrimaryKerberosBlob _pkb;
338 struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
339 struct package_PrimaryKerberosCtr4 *pkb4 = NULL;
340 bool is_krbtgt = false;
341 int krbtgt_number = 0;
342 uint32_t current_kvno;
343 uint32_t returned_kvno = 0;
344 uint16_t i;
345 uint16_t allocated_keys = 0;
346 uint32_t supported_enctypes
347 = ldb_msg_find_attr_as_uint(msg,
348 "msDS-SupportedEncryptionTypes",
349 0);
350
351 if (rid == DOMAIN_RID_KRBTGT || is_rodc) {
352 /* KDCs (and KDCs on RODCs) use AES */
353 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
354 is_krbtgt = true;
355 } else if (userAccountControl & (UF_PARTIAL_SECRETS_ACCOUNT|UF_SERVER_TRUST_ACCOUNT)) {
356 /* DCs and RODCs comptuer accounts use AES */
357 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
358 } else if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT ||
359 (ent_type == SAMBA_KDC_ENT_TYPE_ANY)) {
360 /* for AS-REQ the client chooses the enc types it
361 * supports, and this will vary between computers a
362 * user logs in from.
363 *
364 * likewise for 'any' return as much as is supported,
365 * to export into a keytab */
366 supported_enctypes = ENC_ALL_TYPES;
367 }
368
369 /* If UF_USE_DES_KEY_ONLY has been set, then don't allow use of the newer enc types */
370 if (userAccountControl & UF_USE_DES_KEY_ONLY) {
371 supported_enctypes = 0;
372 } else {
373 /* Otherwise, add in the default enc types */
374 supported_enctypes |= ENC_RC4_HMAC_MD5;
375 }
376
377 /* Is this the krbtgt or a RODC krbtgt */
378 if (is_rodc) {
379 krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
380
381 if (krbtgt_number == -1) {
382 return EINVAL;
383 }
384 if (krbtgt_number == 0) {
385 return EINVAL;
386 }
387 }
388
389 entry_ex->entry.keys.val = NULL;
390 entry_ex->entry.keys.len = 0;
391 entry_ex->entry.kvno = 0;
392
393 if ((ent_type == SAMBA_KDC_ENT_TYPE_CLIENT)
394 && (userAccountControl & UF_SMARTCARD_REQUIRED)) {
395 uint8_t secretbuffer[32];
396
397 /*
398 * Fake keys until we have a better way to reject
399 * non-pkinit requests.
400 *
401 * We just need to indicate which encryption types are
402 * supported.
403 */
404 generate_secret_buffer(secretbuffer, sizeof(secretbuffer));
405
406 allocated_keys = 3;
407 entry_ex->entry.keys.len = 0;
408 entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(struct sdb_key));
409 if (entry_ex->entry.keys.val == NULL) {
410 ZERO_STRUCT(secretbuffer);
411 ret = ENOMEM;
412 goto out;
413 }
414
415 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
416 struct sdb_key key = {};
417
418 ret = smb_krb5_keyblock_init_contents(context,
419 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
420 secretbuffer, 32,
421 &key.key);
422 if (ret) {
423 ZERO_STRUCT(secretbuffer);
424 goto out;
425 }
426
427 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
428 entry_ex->entry.keys.len++;
429 }
430
431 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
432 struct sdb_key key = {};
433
434 ret = smb_krb5_keyblock_init_contents(context,
435 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
436 secretbuffer, 16,
437 &key.key);
438 if (ret) {
439 ZERO_STRUCT(secretbuffer);
440 goto out;
441 }
442
443 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
444 entry_ex->entry.keys.len++;
445 }
446
447 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
448 struct sdb_key key = {};
449
450 ret = smb_krb5_keyblock_init_contents(context,
451 ENCTYPE_ARCFOUR_HMAC,
452 secretbuffer, 16,
453 &key.key);
454 if (ret) {
455 ZERO_STRUCT(secretbuffer);
456 goto out;
457 }
458
459 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
460 entry_ex->entry.keys.len++;
461 }
462
463 ret = 0;
464 goto out;
465 }
466
467 current_kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
468 if (is_krbtgt) {
469 /*
470 * Even for the main krbtgt account
471 * we have to strictly split the kvno into
472 * two 16-bit parts and the upper 16-bit
473 * need to be all zero, even if
474 * the msDS-KeyVersionNumber has a value
475 * larger than 65535.
476 *
477 * See https://bugzilla.samba.org/show_bug.cgi?id=14951
478 */
479 current_kvno = SAMBA_KVNO_GET_VALUE(current_kvno);
480 }
481
482 /* Get keys from the db */
483
484 hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
485 sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
486
487 /* unicodePwd for enctype 0x17 (23) if present */
488 if (hash) {
489 allocated_keys++;
490 }
491
492 /* supplementalCredentials if present */
493 if (sc_val) {
494 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, &scb,
495 (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
496 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
497 dump_data(0, sc_val->data, sc_val->length);
498 ret = EINVAL;
499 goto out;
500 }
501
502 if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) {
503 if (scb.sub.num_packages != 0) {
504 NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
505 ret = EINVAL;
506 goto out;
507 }
508 }
509
510 for (i=0; i < scb.sub.num_packages; i++) {
511 if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) {
512 scpk = &scb.sub.packages[i];
513 if (!scpk->data || !scpk->data[0]) {
514 scpk = NULL;
515 continue;
516 }
517 newer_keys = true;
518 break;
519 } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) {
520 scpk = &scb.sub.packages[i];
521 if (!scpk->data || !scpk->data[0]) {
522 scpk = NULL;
523 }
524 /*
525 * we don't break here in hope to find
526 * a Kerberos-Newer-Keys package
527 */
528 }
529 }
530 }
531 /*
532 * Primary:Kerberos-Newer-Keys or Primary:Kerberos element
533 * of supplementalCredentials
534 */
535 if (scpk) {
536 DATA_BLOB blob;
537
538 blob = strhex_to_data_blob(mem_ctx, scpk->data);
539 if (!blob.data) {
540 ret = ENOMEM;
541 goto out;
542 }
543
544 /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */
545 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &_pkb,
546 (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
547 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
548 ret = EINVAL;
549 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
550 krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
551 goto out;
552 }
553
554 if (newer_keys && _pkb.version != 4) {
555 ret = EINVAL;
556 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
557 krb5_warnx(context, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
558 goto out;
559 }
560
561 if (!newer_keys && _pkb.version != 3) {
562 ret = EINVAL;
563 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
564 krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
565 goto out;
566 }
567
568 if (_pkb.version == 4) {
569 pkb4 = &_pkb.ctr.ctr4;
570 allocated_keys += pkb4->num_keys;
571 } else if (_pkb.version == 3) {
572 pkb3 = &_pkb.ctr.ctr3;
573 allocated_keys += pkb3->num_keys;
574 }
575 }
576
577 if (allocated_keys == 0) {
578 if (kdc_db_ctx->rodc) {
579 /* We are on an RODC, but don't have keys for this account. Signal this to the caller */
580 auth_sam_trigger_repl_secret(kdc_db_ctx, kdc_db_ctx->msg_ctx,
581 kdc_db_ctx->ev_ctx, msg->dn);
582 return SDB_ERR_NOT_FOUND_HERE;
583 }
584
585 /* oh, no password. Apparently (comment in
586 * hdb-ldap.c) this violates the ASN.1, but this
587 * allows an entry with no keys (yet). */
588 return 0;
589 }
590
591 /* allocate space to decode into */
592 entry_ex->entry.keys.len = 0;
593 entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(struct sdb_key));
594 if (entry_ex->entry.keys.val == NULL) {
595 ret = ENOMEM;
596 goto out;
597 }
598
599 if (hash && (supported_enctypes & ENC_RC4_HMAC_MD5)) {
600 struct sdb_key key = {};
601
602 ret = smb_krb5_keyblock_init_contents(context,
603 ENCTYPE_ARCFOUR_HMAC,
604 hash->hash,
605 sizeof(hash->hash),
606 &key.key);
607 if (ret) {
608 goto out;
609 }
610
611 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
612 entry_ex->entry.keys.len++;
613 }
614
615 if (pkb4) {
616 for (i=0; i < pkb4->num_keys; i++) {
617 struct sdb_key key = {};
618
619 if (!pkb4->keys[i].value) continue;
620
621 if (!(kerberos_enctype_to_bitmap(pkb4->keys[i].keytype) & supported_enctypes)) {
622 continue;
623 }
624
625 if (pkb4->salt.string) {
626 DATA_BLOB salt;
627
628 salt = data_blob_string_const(pkb4->salt.string);
629
630 key.salt = calloc(1, sizeof(*key.salt));
631 if (key.salt == NULL) {
632 ret = ENOMEM;
633 goto out;
634 }
635
636 key.salt->type = KRB5_PW_SALT;
637
638 ret = smb_krb5_copy_data_contents(&key.salt->salt,
639 salt.data,
640 salt.length);
641 if (ret) {
642 free(key.salt);
643 key.salt = NULL;
644 goto out;
645 }
646 }
647
648 /* TODO: maybe pass the iteration_count somehow... */
649
650 ret = smb_krb5_keyblock_init_contents(context,
651 pkb4->keys[i].keytype,
652 pkb4->keys[i].value->data,
653 pkb4->keys[i].value->length,
654 &key.key);
655 if (ret) {
656 if (key.salt) {
657 smb_krb5_free_data_contents(context, &key.salt->salt);
658 free(key.salt);
659 key.salt = NULL;
660 }
661 if (ret == KRB5_PROG_ETYPE_NOSUPP) {
662 DEBUG(2,("Unsupported keytype ignored - type %u\n",
663 pkb4->keys[i].keytype));
664 ret = 0;
665 continue;
666 }
667 goto out;
668 }
669
670 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
671 entry_ex->entry.keys.len++;
672 }
673 } else if (pkb3) {
674 for (i=0; i < pkb3->num_keys; i++) {
675 struct sdb_key key = {};
676
677 if (!pkb3->keys[i].value) continue;
678
679 if (!(kerberos_enctype_to_bitmap(pkb3->keys[i].keytype) & supported_enctypes)) {
680 continue;
681 }
682
683 if (pkb3->salt.string) {
684 DATA_BLOB salt;
685
686 salt = data_blob_string_const(pkb3->salt.string);
687
688 key.salt = calloc(1, sizeof(*key.salt));
689 if (key.salt == NULL) {
690 ret = ENOMEM;
691 goto out;
692 }
693
694 key.salt->type = KRB5_PW_SALT;
695
696 ret = smb_krb5_copy_data_contents(&key.salt->salt,
697 salt.data,
698 salt.length);
699 if (ret) {
700 free(key.salt);
701 key.salt = NULL;
702 goto out;
703 }
704 }
705
706 ret = smb_krb5_keyblock_init_contents(context,
707 pkb3->keys[i].keytype,
708 pkb3->keys[i].value->data,
709 pkb3->keys[i].value->length,
710 &key.key);
711 if (ret) {
712 if (key.salt) {
713 smb_krb5_free_data_contents(context, &key.salt->salt);
714 free(key.salt);
715 key.salt = NULL;
716 }
717 if (ret == KRB5_PROG_ETYPE_NOSUPP) {
718 DEBUG(2,("Unsupported keytype ignored - type %u\n",
719 pkb3->keys[i].keytype));
720 ret = 0;
721 continue;
722 }
723 goto out;
724 }
725
726 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
727 entry_ex->entry.keys.len++;
728 }
729 }
730
731 returned_kvno = current_kvno;
732 if (is_krbtgt) {
733 /*
734 * Even for the main krbtgt account
735 * we have to strictly split the kvno into
736 * two 16-bit parts and the upper 16-bit
737 * need to be all zero, even if
738 * the msDS-KeyVersionNumber has a value
739 * larger than 65535.
740 *
741 * See https://bugzilla.samba.org/show_bug.cgi?id=14951
742 */
743 returned_kvno = SAMBA_KVNO_AND_KRBTGT(returned_kvno, krbtgt_number);
744 }
745 entry->kvno = returned_kvno;
746
747 out:
748 if (ret != 0) {
749 entry_ex->entry.keys.len = 0;
750 } else if (entry_ex->entry.keys.len > 0 &&
751 entry_ex->entry.keys.val != NULL) {
752 ret = samba_kdc_sort_encryption_keys(entry_ex);
753 if (ret != 0) {
754 entry_ex->entry.keys.len = 0;
755 ret = ENOMEM;
756 }
757 }
758 if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
759 free(entry_ex->entry.keys.val);
760 entry_ex->entry.keys.val = NULL;
761 }
762 return ret;
763 }
764
765 static int principal_comp_strcmp_int(krb5_context context,
766 krb5_const_principal principal,
767 unsigned int component,
768 const char *string,
769 bool do_strcasecmp)
770 {
771 const char *p;
772 size_t len;
773
774 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
775 p = krb5_principal_get_comp_string(context, principal, component);
776 if (p == NULL) {
777 return -1;
778 }
779 len = strlen(p);
780 #else
781 krb5_data *d;
782 if (component >= krb5_princ_size(context, principal)) {
783 return -1;
784 }
785
786 d = krb5_princ_component(context, principal, component);
787 if (d == NULL) {
788 return -1;
789 }
790
791 p = d->data;
792 len = d->length;
793 #endif
794 if (do_strcasecmp) {
795 return strncasecmp(p, string, len);
796 } else {
797 return strncmp(p, string, len);
798 }
799 }
800
801 static int principal_comp_strcasecmp(krb5_context context,
802 krb5_const_principal principal,
803 unsigned int component,
804 const char *string)
805 {
806 return principal_comp_strcmp_int(context, principal,
807 component, string, true);
808 }
809
810 static int principal_comp_strcmp(krb5_context context,
811 krb5_const_principal principal,
812 unsigned int component,
813 const char *string)
814 {
815 return principal_comp_strcmp_int(context, principal,
816 component, string, false);
817 }
818
819 static bool is_kadmin_changepw(krb5_context context,
820 krb5_const_principal principal)
821 {
822 return krb5_princ_size(context, principal) == 2 &&
823 (principal_comp_strcmp(context, principal, 0, "kadmin") == 0) &&
824 (principal_comp_strcmp(context, principal, 1, "changepw") == 0);
825 }
826
827 static krb5_error_code samba_kdc_get_entry_principal(
828 krb5_context context,
829 struct samba_kdc_db_context *kdc_db_ctx,
830 const char *samAccountName,
831 enum samba_kdc_ent_type ent_type,
832 unsigned flags,
833 bool is_kadmin_changepw,
834 krb5_const_principal in_princ,
835 krb5_principal *out_princ)
836 {
837 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
838 krb5_error_code code = 0;
839 bool canon = flags & (SDB_F_CANON|SDB_F_FORCE_CANON);
840
841 /*
842 * If we are set to canonicalize, we get back the fixed UPPER
843 * case realm, and the real username (ie matching LDAP
844 * samAccountName)
845 *
846 * Otherwise, if we are set to enterprise, we
847 * get back the whole principal as-sent
848 *
849 * Finally, if we are not set to canonicalize, we get back the
850 * fixed UPPER case realm, but the as-sent username
851 */
852
853 /*
854 * We need to ensure that the kadmin/changepw principal isn't able to
855 * issue krbtgt tickets, even if canonicalization is turned on.
856 */
857 if (!is_kadmin_changepw) {
858 if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT && canon) {
859 /*
860 * When requested to do so, ensure that the
861 * both realm values in the principal are set
862 * to the upper case, canonical realm
863 */
864 code = smb_krb5_make_principal(context,
865 out_princ,
866 lpcfg_realm(lp_ctx),
867 "krbtgt",
868 lpcfg_realm(lp_ctx),
869 NULL);
870 if (code != 0) {
871 return code;
872 }
873 smb_krb5_principal_set_type(context,
874 *out_princ,
875 KRB5_NT_SRV_INST);
876
877 return 0;
878 }
879
880 if ((canon && flags & (SDB_F_FORCE_CANON|SDB_F_FOR_AS_REQ)) ||
881 (ent_type == SAMBA_KDC_ENT_TYPE_ANY && in_princ == NULL)) {
882 /*
883 * SDB_F_CANON maps from the canonicalize flag in the
884 * packet, and has a different meaning between AS-REQ
885 * and TGS-REQ. We only change the principal in the
886 * AS-REQ case.
887 *
888 * The SDB_F_FORCE_CANON if for new MIT KDC code that
889 * wants the canonical name in all lookups, and takes
890 * care to canonicalize only when appropriate.
891 */
892 code = smb_krb5_make_principal(context,
893 out_princ,
894 lpcfg_realm(lp_ctx),
895 samAccountName,
896 NULL);
897 return code;
898 }
899 }
900
901 /*
902 * For a krbtgt entry, this appears to be required regardless of the
903 * canonicalize flag from the client.
904 */
905 code = krb5_copy_principal(context, in_princ, out_princ);
906 if (code != 0) {
907 return code;
908 }
909
910 /*
911 * While we have copied the client principal, tests show that Win2k3
912 * returns the 'corrected' realm, not the client-specified realm. This
913 * code attempts to replace the client principal's realm with the one
914 * we determine from our records
915 */
916 code = smb_krb5_principal_set_realm(context,
917 *out_princ,
918 lpcfg_realm(lp_ctx));
919
920 return code;
921 }
922
923 /*
924 * Construct an hdb_entry from a directory entry.
925 */
926 static krb5_error_code samba_kdc_message2entry(krb5_context context,
927 struct samba_kdc_db_context *kdc_db_ctx,
928 TALLOC_CTX *mem_ctx,
929 krb5_const_principal principal,
930 enum samba_kdc_ent_type ent_type,
931 unsigned flags,
932 struct ldb_dn *realm_dn,
933 struct ldb_message *msg,
934 struct sdb_entry_ex *entry_ex)
935 {
936 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
937 uint32_t userAccountControl;
938 uint32_t msDS_User_Account_Control_Computed;
939 krb5_error_code ret = 0;
940 krb5_boolean is_computer = FALSE;
941
942 struct samba_kdc_entry *p;
943 NTTIME acct_expiry;
944 NTSTATUS status;
945
946 uint32_t rid;
947 bool is_rodc = false;
948 struct ldb_message_element *objectclasses;
949 struct ldb_val computer_val;
950 const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
951 computer_val.data = discard_const_p(uint8_t,"computer");
952 computer_val.length = strlen((const char *)computer_val.data);
953
954 if (ldb_msg_find_element(msg, "msDS-SecondaryKrbTgtNumber")) {
955 is_rodc = true;
956 }
957
958 if (!samAccountName) {
959 ret = ENOENT;
960 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no samAccountName present");
961 goto out;
962 }
963
964 objectclasses = ldb_msg_find_element(msg, "objectClass");
965
966 if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
967 is_computer = TRUE;
968 }
969
970 ZERO_STRUCTP(entry_ex);
971
972 p = talloc_zero(mem_ctx, struct samba_kdc_entry);
973 if (!p) {
974 ret = ENOMEM;
975 goto out;
976 }
977
978 p->is_rodc = is_rodc;
979 p->kdc_db_ctx = kdc_db_ctx;
980 p->realm_dn = talloc_reference(p, realm_dn);
981 if (!p->realm_dn) {
982 ret = ENOMEM;
983 goto out;
984 }
985
986 talloc_set_destructor(p, samba_kdc_entry_destructor);
987
988 entry_ex->ctx = p;
989
990 userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
991
992 msDS_User_Account_Control_Computed
993 = ldb_msg_find_attr_as_uint(msg,
994 "msDS-User-Account-Control-Computed",
995 UF_ACCOUNTDISABLE);
996
997 /*
998 * This brings in the lockout flag, block the account if not
999 * found. We need the weird UF_ACCOUNTDISABLE check because
1000 * we do not want to fail open if the value is not returned,
1001 * but 0 is a valid value (all OK)
1002 */
1003 if (msDS_User_Account_Control_Computed == UF_ACCOUNTDISABLE) {
1004 ret = EINVAL;
1005 krb5_set_error_message(context, ret, "samba_kdc_message2entry: "
1006 "no msDS-User-Account-Control-Computed present");
1007 goto out;
1008 } else {
1009 userAccountControl |= msDS_User_Account_Control_Computed;
1010 }
1011
1012 if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT) {
1013 p->is_krbtgt = true;
1014 }
1015
1016 /* First try and figure out the flags based on the userAccountControl */
1017 entry_ex->entry.flags = uf2SDBFlags(context, userAccountControl, ent_type);
1018
1019 /* Windows 2008 seems to enforce this (very sensible) rule by
1020 * default - don't allow offline attacks on a user's password
1021 * by asking for a ticket to them as a service (encrypted with
1022 * their probably patheticly insecure password) */
1023
1024 if (entry_ex->entry.flags.server
1025 && lpcfg_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
1026 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
1027 entry_ex->entry.flags.server = 0;
1028 }
1029 }
1030
1031 /*
1032 * We restrict a 3-part SPN ending in my domain/realm to full
1033 * domain controllers.
1034 *
1035 * This avoids any cases where (eg) a demoted DC still has
1036 * these more restricted SPNs.
1037 */
1038 if (krb5_princ_size(context, principal) > 2) {
1039 char *third_part
1040 = smb_krb5_principal_get_comp_string(mem_ctx,
1041 context,
1042 principal,
1043 2);
1044 bool is_our_realm =
1045 lpcfg_is_my_domain_or_realm(lp_ctx,
1046 third_part);
1047 bool is_dc = userAccountControl &
1048 (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT);
1049 if (is_our_realm && !is_dc) {
1050 entry_ex->entry.flags.server = 0;
1051 }
1052 }
1053 /*
1054 * To give the correct type of error to the client, we must
1055 * not just return the entry without .server set, we must
1056 * pretend the principal does not exist. Otherwise we may
1057 * return ERR_POLICY instead of
1058 * KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
1059 */
1060 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER && entry_ex->entry.flags.server == 0) {
1061 ret = SDB_ERR_NOENTRY;
1062 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no servicePrincipalName present for this server, refusing with no-such-entry");
1063 goto out;
1064 }
1065 if (flags & SDB_F_ADMIN_DATA) {
1066 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
1067 * of the Heimdal KDC. They are stored in a the traditional
1068 * DB for audit purposes, and still form part of the structure
1069 * we must return */
1070
1071 /* use 'whenCreated' */
1072 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
1073 /* use 'kadmin' for now (needed by mit_samba) */
1074
1075 ret = smb_krb5_make_principal(context,
1076 &entry_ex->entry.created_by.principal,
1077 lpcfg_realm(lp_ctx), "kadmin", NULL);
1078 if (ret) {
1079 krb5_clear_error_message(context);
1080 goto out;
1081 }
1082
1083 entry_ex->entry.modified_by = (struct sdb_event *) malloc(sizeof(struct sdb_event));
1084 if (entry_ex->entry.modified_by == NULL) {
1085 ret = ENOMEM;
1086 krb5_set_error_message(context, ret, "malloc: out of memory");
1087 goto out;
1088 }
1089
1090 /* use 'whenChanged' */
1091 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
1092 /* use 'kadmin' for now (needed by mit_samba) */
1093 ret = smb_krb5_make_principal(context,
1094 &entry_ex->entry.modified_by->principal,
1095 lpcfg_realm(lp_ctx), "kadmin", NULL);
1096 if (ret) {
1097 krb5_clear_error_message(context);
1098 goto out;
1099 }
1100 }
1101
1102
1103 /* The lack of password controls etc applies to krbtgt by
1104 * virtue of being that particular RID */
1105 status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
1106
1107 if (!NT_STATUS_IS_OK(status)) {
1108 ret = EINVAL;
1109 goto out;
1110 }
1111
1112 if (rid == DOMAIN_RID_KRBTGT) {
1113 char *realm = NULL;
1114
1115 entry_ex->entry.valid_end = NULL;
1116 entry_ex->entry.pw_end = NULL;
1117
1118 entry_ex->entry.flags.invalid = 0;
1119 entry_ex->entry.flags.server = 1;
1120
1121 realm = smb_krb5_principal_get_realm(
1122 mem_ctx, context, principal);
1123 if (realm == NULL) {
1124 ret = ENOMEM;
1125 goto out;
1126 }
1127
1128 /* Don't mark all requests for the krbtgt/realm as
1129 * 'change password', as otherwise we could get into
1130 * trouble, and not enforce the password expirty.
1131 * Instead, only do it when request is for the kpasswd service */
1132 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER &&
1133 is_kadmin_changepw(context, principal) &&
1134 lpcfg_is_my_domain_or_realm(lp_ctx, realm)) {
1135 entry_ex->entry.flags.change_pw = 1;
1136 }
1137
1138 TALLOC_FREE(realm);
1139
1140 entry_ex->entry.flags.client = 0;
1141 entry_ex->entry.flags.forwardable = 1;
1142 entry_ex->entry.flags.ok_as_delegate = 1;
1143 } else if (is_rodc) {
1144 /* The RODC krbtgt account is like the main krbtgt,
1145 * but it does not have a changepw or kadmin
1146 * service */
1147
1148 entry_ex->entry.valid_end = NULL;
1149 entry_ex->entry.pw_end = NULL;
1150
1151 /* Also don't allow the RODC krbtgt to be a client (it should not be needed) */
1152 entry_ex->entry.flags.client = 0;
1153 entry_ex->entry.flags.invalid = 0;
1154 entry_ex->entry.flags.server = 1;
1155
1156 entry_ex->entry.flags.client = 0;
1157 entry_ex->entry.flags.forwardable = 1;
1158 entry_ex->entry.flags.ok_as_delegate = 0;
1159 } else if (entry_ex->entry.flags.server && ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
1160 /* The account/password expiry only applies when the account is used as a
1161 * client (ie password login), not when used as a server */
1162
1163 /* Make very well sure we don't use this for a client,
1164 * it could bypass the password restrictions */
1165 entry_ex->entry.flags.client = 0;
1166
1167 entry_ex->entry.valid_end = NULL;
1168 entry_ex->entry.pw_end = NULL;
1169
1170 } else {
1171 NTTIME must_change_time
1172 = samdb_result_nttime(msg,
1173 "msDS-UserPasswordExpiryTimeComputed",
1174 0);
1175 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
1176 entry_ex->entry.pw_end = NULL;
1177 } else {
1178 entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
1179 if (entry_ex->entry.pw_end == NULL) {
1180 ret = ENOMEM;
1181 goto out;
1182 }
1183 *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
1184 }
1185
1186 acct_expiry = samdb_result_account_expires(msg);
1187 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
1188 entry_ex->entry.valid_end = NULL;
1189 } else {
1190 entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
1191 if (entry_ex->entry.valid_end == NULL) {
1192 ret = ENOMEM;
1193 goto out;
1194 }
1195 *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
1196 }
1197 }
1198
1199 ret = samba_kdc_get_entry_principal(context,
1200 kdc_db_ctx,
1201 samAccountName,
1202 ent_type,
1203 flags,
1204 entry_ex->entry.flags.change_pw,
1205 principal,
1206 &entry_ex->entry.principal);
1207 if (ret != 0) {
1208 krb5_clear_error_message(context);
1209 goto out;
1210 }
1211
1212 entry_ex->entry.valid_start = NULL;
1213
1214 entry_ex->entry.max_life = malloc(sizeof(*entry_ex->entry.max_life));
1215 if (entry_ex->entry.max_life == NULL) {
1216 ret = ENOMEM;
1217 goto out;
1218 }
1219
1220 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
1221 *entry_ex->entry.max_life = kdc_db_ctx->policy.svc_tkt_lifetime;
1222 } else if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT || ent_type == SAMBA_KDC_ENT_TYPE_CLIENT) {
1223 *entry_ex->entry.max_life = kdc_db_ctx->policy.usr_tkt_lifetime;
1224 } else {
1225 *entry_ex->entry.max_life = MIN(kdc_db_ctx->policy.svc_tkt_lifetime,
1226 kdc_db_ctx->policy.usr_tkt_lifetime);
1227 }
1228
1229 if (entry_ex->entry.flags.change_pw) {
1230 /* Limit lifetime of kpasswd tickets to two minutes or less. */
1231 *entry_ex->entry.max_life = MIN(*entry_ex->entry.max_life, CHANGEPW_LIFETIME);
1232 }
1233
1234 entry_ex->entry.max_renew = malloc(sizeof(*entry_ex->entry.max_life));
1235 if (entry_ex->entry.max_renew == NULL) {
1236 ret = ENOMEM;
1237 goto out;
1238 }
1239
1240 *entry_ex->entry.max_renew = kdc_db_ctx->policy.renewal_lifetime;
1241
1242 /* Get keys from the db */
1243 ret = samba_kdc_message2entry_keys(context, kdc_db_ctx, p, msg,
1244 rid, is_rodc, userAccountControl,
1245 ent_type, entry_ex);
1246 if (ret) {
1247 /* Could be bogus data in the entry, or out of memory */
1248 goto out;
1249 }
1250
1251 p->msg = talloc_steal(p, msg);
1252
1253 out:
1254 if (ret != 0) {
1255 /* This doesn't free ent itself, that is for the eventual caller to do */
1256 sdb_free_entry(entry_ex);
1257 ZERO_STRUCTP(entry_ex);
1258 } else {
1259 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1260 }
1261
1262 return ret;
1263 }
1264
1265 /*
1266 * Construct an hdb_entry from a directory entry.
1267 * The kvno is what the remote client asked for
1268 */
1269 static krb5_error_code samba_kdc_trust_message2entry(krb5_context context,
1270 struct samba_kdc_db_context *kdc_db_ctx,
1271 TALLOC_CTX *mem_ctx, krb5_const_principal principal,
1272 enum trust_direction direction,
1273 struct ldb_dn *realm_dn,
1274 unsigned flags,
1275 uint32_t kvno,
1276 struct ldb_message *msg,
1277 struct sdb_entry_ex *entry_ex)
1278 {
1279 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1280 const char *our_realm = lpcfg_realm(lp_ctx);
1281 char *partner_realm = NULL;
1282 const char *realm = NULL;
1283 const char *krbtgt_realm = NULL;
1284 DATA_BLOB password_utf16 = data_blob_null;
1285 DATA_BLOB password_utf8 = data_blob_null;
1286 struct samr_Password _password_hash;
1287 const struct samr_Password *password_hash = NULL;
1288 const struct ldb_val *password_val;
1289 struct trustAuthInOutBlob password_blob;
1290 struct samba_kdc_entry *p;
1291 bool use_previous = false;
1292 uint32_t current_kvno;
1293 uint32_t previous_kvno;
1294 uint32_t num_keys = 0;
1295 enum ndr_err_code ndr_err;
1296 int ret;
1297 unsigned int i;
1298 struct AuthenticationInformationArray *auth_array;
1299 struct timeval tv;
1300 NTTIME an_hour_ago;
1301 uint32_t *auth_kvno;
1302 bool preferr_current = false;
1303 uint32_t supported_enctypes = ENC_RC4_HMAC_MD5;
1304 struct lsa_TrustDomainInfoInfoEx *tdo = NULL;
1305 NTSTATUS status;
1306
1307 if (dsdb_functional_level(kdc_db_ctx->samdb) >= DS_DOMAIN_FUNCTION_2008) {
1308 supported_enctypes = ldb_msg_find_attr_as_uint(msg,
1309 "msDS-SupportedEncryptionTypes",
1310 supported_enctypes);
1311 }
1312
1313 status = dsdb_trust_parse_tdo_info(mem_ctx, msg, &tdo);
1314 if (!NT_STATUS_IS_OK(status)) {
1315 krb5_clear_error_message(context);
1316 ret = ENOMEM;
1317 goto out;
1318 }
1319
1320 if (!(tdo->trust_direction & direction)) {
1321 krb5_clear_error_message(context);
1322 ret = SDB_ERR_NOENTRY;
1323 goto out;
1324 }
1325
1326 if (tdo->trust_type != LSA_TRUST_TYPE_UPLEVEL) {
1327 /*
1328 * Only UPLEVEL domains support kerberos here,
1329 * as we don't support LSA_TRUST_TYPE_MIT.
1330 */
1331 krb5_clear_error_message(context);
1332 ret = SDB_ERR_NOENTRY;
1333 goto out;
1334 }
1335
1336 if (tdo->trust_attributes & LSA_TRUST_ATTRIBUTE_CROSS_ORGANIZATION) {
1337 /*
1338 * We don't support selective authentication yet.
1339 */
1340 krb5_clear_error_message(context);
1341 ret = SDB_ERR_NOENTRY;
1342 goto out;
1343 }
1344
1345 if (tdo->domain_name.string == NULL) {
1346 krb5_clear_error_message(context);
1347 ret = SDB_ERR_NOENTRY;
1348 goto out;
1349 }
1350 partner_realm = strupper_talloc(mem_ctx, tdo->domain_name.string);
1351 if (partner_realm == NULL) {
1352 krb5_clear_error_message(context);
1353 ret = ENOMEM;
1354 goto out;
1355 }
1356
1357 if (direction == INBOUND) {
1358 realm = our_realm;
1359 krbtgt_realm = partner_realm;
1360
1361 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
1362 } else { /* OUTBOUND */
1363 realm = partner_realm;
1364 krbtgt_realm = our_realm;
1365
1366 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
1367 }
1368
1369 if (password_val == NULL) {
1370 krb5_clear_error_message(context);
1371 ret = SDB_ERR_NOENTRY;
1372 goto out;
1373 }
1374
1375 ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, &password_blob,
1376 (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
1377 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1378 krb5_clear_error_message(context);
1379 ret = EINVAL;
1380 goto out;
1381 }
1382
1383 p = talloc_zero(mem_ctx, struct samba_kdc_entry);
1384 if (!p) {
1385 ret = ENOMEM;
1386 goto out;
1387 }
1388
1389 p->is_trust = true;
1390 p->kdc_db_ctx = kdc_db_ctx;
1391 p->realm_dn = realm_dn;
1392
1393 talloc_set_destructor(p, samba_kdc_entry_destructor);
1394
1395 /* make sure we do not have bogus data in there */
1396 memset(&entry_ex->entry, 0, sizeof(struct sdb_entry));
1397
1398 entry_ex->ctx = p;
1399
1400 /* use 'whenCreated' */
1401 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
1402 /* use 'kadmin' for now (needed by mit_samba) */
1403 ret = smb_krb5_make_principal(context,
1404 &entry_ex->entry.created_by.principal,
1405 realm, "kadmin", NULL);
1406 if (ret) {
1407 krb5_clear_error_message(context);
1408 goto out;
1409 }
1410
1411 /*
1412 * We always need to generate the canonicalized principal
1413 * with the values of our database.
1414 */
1415 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, realm,
1416 "krbtgt", krbtgt_realm, NULL);
1417 if (ret) {
1418 krb5_clear_error_message(context);
1419 goto out;
1420 }
1421 smb_krb5_principal_set_type(context, entry_ex->entry.principal,
1422 KRB5_NT_SRV_INST);
1423
1424 entry_ex->entry.valid_start = NULL;
1425
1426 /* we need to work out if we are going to use the current or
1427 * the previous password hash.
1428 * We base this on the kvno the client passes in. If the kvno
1429 * passed in is equal to the current kvno in our database then
1430 * we use the current structure. If it is the current kvno-1,
1431 * then we use the previous substrucure.
1432 */
1433
1434 /*
1435 * Windows preferrs the previous key for one hour.
1436 */
1437 tv = timeval_current();
1438 if (tv.tv_sec > 3600) {
1439 tv.tv_sec -= 3600;
1440 }
1441 an_hour_ago = timeval_to_nttime(&tv);
1442
1443 /* first work out the current kvno */
1444 current_kvno = 0;
1445 for (i=0; i < password_blob.count; i++) {
1446 struct AuthenticationInformation *a =
1447 &password_blob.current.array[i];
1448
1449 if (a->LastUpdateTime <= an_hour_ago) {
1450 preferr_current = true;
1451 }
1452
1453 if (a->AuthType == TRUST_AUTH_TYPE_VERSION) {
1454 current_kvno = a->AuthInfo.version.version;
1455 }
1456 }
1457 if (current_kvno == 0) {
1458 previous_kvno = 255;
1459 } else {
1460 previous_kvno = current_kvno - 1;
1461 }
1462 for (i=0; i < password_blob.count; i++) {
1463 struct AuthenticationInformation *a =
1464 &password_blob.previous.array[i];
1465
1466 if (a->AuthType == TRUST_AUTH_TYPE_VERSION) {
1467 previous_kvno = a->AuthInfo.version.version;
1468 }
1469 }
1470
1471 /* work out whether we will use the previous or current
1472 password */
1473 if (password_blob.previous.count == 0) {
1474 /* there is no previous password */
1475 use_previous = false;
1476 } else if (!(flags & SDB_F_KVNO_SPECIFIED)) {
1477 /*
1478 * If not specified we use the lowest kvno
1479 * for the first hour after an update.
1480 */
1481 if (preferr_current) {
1482 use_previous = false;
1483 } else if (previous_kvno < current_kvno) {
1484 use_previous = true;
1485 } else {
1486 use_previous = false;
1487 }
1488 } else if (kvno == current_kvno) {
1489 /*
1490 * Exact match ...
1491 */
1492 use_previous = false;
1493 } else if (kvno == previous_kvno) {
1494 /*
1495 * Exact match ...
1496 */
1497 use_previous = true;
1498 } else {
1499 /*
1500 * Fallback to the current one for anything else
1501 */
1502 use_previous = false;
1503 }
1504
1505 if (use_previous) {
1506 auth_array = &password_blob.previous;
1507 auth_kvno = &previous_kvno;
1508 } else {
1509 auth_array = &password_blob.current;
1510 auth_kvno = &current_kvno;
1511 }
1512
1513 /* use the kvno the client specified, if available */
1514 if (flags & SDB_F_KVNO_SPECIFIED) {
1515 entry_ex->entry.kvno = kvno;
1516 } else {
1517 entry_ex->entry.kvno = *auth_kvno;
1518 }
1519
1520 for (i=0; i < auth_array->count; i++) {
1521 if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
1522 bool ok;
1523
1524 password_utf16 = data_blob_const(auth_array->array[i].AuthInfo.clear.password,
1525 auth_array->array[i].AuthInfo.clear.size);
1526 if (password_utf16.length == 0) {
1527 break;
1528 }
1529
1530 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1531 mdfour(_password_hash.hash, password_utf16.data, password_utf16.length);
1532 if (password_hash == NULL) {
1533 num_keys += 1;
1534 }
1535 password_hash = &_password_hash;
1536 }
1537
1538 if (!(supported_enctypes & (ENC_HMAC_SHA1_96_AES128|ENC_HMAC_SHA1_96_AES256))) {
1539 break;
1540 }
1541
1542 ok = convert_string_talloc(mem_ctx,
1543 CH_UTF16MUNGED, CH_UTF8,
1544 password_utf16.data,
1545 password_utf16.length,
1546 (void *)&password_utf8.data,
1547 &password_utf8.length);
1548 if (!ok) {
1549 krb5_clear_error_message(context);
1550 ret = ENOMEM;
1551 goto out;
1552 }
1553
1554 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1555 num_keys += 1;
1556 }
1557 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1558 num_keys += 1;
1559 }
1560 break;
1561 } else if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
1562 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1563 password_hash = &auth_array->array[i].AuthInfo.nt4owf.password;
1564 num_keys += 1;
1565 }
1566 }
1567 }
1568
1569 /* Must have found a cleartext or MD4 password */
1570 if (num_keys == 0) {
1571 DEBUG(1,(__location__ ": no usable key found\n"));
1572 krb5_clear_error_message(context);
1573 ret = SDB_ERR_NOENTRY;
1574 goto out;
1575 }
1576
1577 entry_ex->entry.keys.val = calloc(num_keys, sizeof(struct sdb_key));
1578 if (entry_ex->entry.keys.val == NULL) {
1579 krb5_clear_error_message(context);
1580 ret = ENOMEM;
1581 goto out;
1582 }
1583
1584 if (password_utf8.length != 0) {
1585 struct sdb_key key = {};
1586 krb5_const_principal salt_principal = entry_ex->entry.principal;
1587 krb5_data salt;
1588 krb5_data cleartext_data;
1589
1590 cleartext_data.data = discard_const_p(char, password_utf8.data);
1591 cleartext_data.length = password_utf8.length;
1592
1593 ret = smb_krb5_get_pw_salt(context,
1594 salt_principal,
1595 &salt);
1596 if (ret != 0) {
1597 goto out;
1598 }
1599
1600 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1601 ret = smb_krb5_create_key_from_string(context,
1602 salt_principal,
1603 &salt,
1604 &cleartext_data,
1605 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
1606 &key.key);
1607 if (ret != 0) {
1608 smb_krb5_free_data_contents(context, &salt);
1609 goto out;
1610 }
1611
1612 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1613 entry_ex->entry.keys.len++;
1614 }
1615
1616 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1617 ret = smb_krb5_create_key_from_string(context,
1618 salt_principal,
1619 &salt,
1620 &cleartext_data,
1621 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
1622 &key.key);
1623 if (ret != 0) {
1624 smb_krb5_free_data_contents(context, &salt);
1625 goto out;
1626 }
1627
1628 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1629 entry_ex->entry.keys.len++;
1630 }
1631
1632 smb_krb5_free_data_contents(context, &salt);
1633 }
1634
1635 if (password_hash != NULL) {
1636 struct sdb_key key = {};
1637
1638 ret = smb_krb5_keyblock_init_contents(context,
1639 ENCTYPE_ARCFOUR_HMAC,
1640 password_hash->hash,
1641 sizeof(password_hash->hash),
1642 &key.key);
1643 if (ret != 0) {
1644 goto out;
1645 }
1646
1647 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1648 entry_ex->entry.keys.len++;
1649 }
1650
1651 entry_ex->entry.flags = int2SDBFlags(0);
1652 entry_ex->entry.flags.immutable = 1;
1653 entry_ex->entry.flags.invalid = 0;
1654 entry_ex->entry.flags.server = 1;
1655 entry_ex->entry.flags.require_preauth = 1;
1656
1657 entry_ex->entry.pw_end = NULL;
1658
1659 entry_ex->entry.max_life = NULL;
1660
1661 entry_ex->entry.max_renew = NULL;
1662
1663 /* Match Windows behavior and allow forwardable flag in cross-realm. */
1664 entry_ex->entry.flags.forwardable = 1;
1665
1666 ret = samba_kdc_sort_encryption_keys(entry_ex);
1667 if (ret != 0) {
1668 krb5_clear_error_message(context);
1669 ret = ENOMEM;
1670 goto out;
1671 }
1672
1673 p->msg = talloc_steal(p, msg);
1674
1675 out:
1676 TALLOC_FREE(partner_realm);
1677
1678 if (ret != 0) {
1679 /* This doesn't free ent itself, that is for the eventual caller to do */
1680 sdb_free_entry(entry_ex);
1681 } else {
1682 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1683 }
1684
1685 return ret;
1686
1687 }
1688
1689 static krb5_error_code samba_kdc_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
1690 TALLOC_CTX *mem_ctx,
1691 const char *realm,
1692 struct ldb_dn *realm_dn,
1693 struct ldb_message **pmsg)
1694 {
1695 NTSTATUS status;
1696 const char * const *attrs = trust_attrs;
1697
1698 status = dsdb_trust_search_tdo(ldb_ctx, realm, realm,
1699 attrs, mem_ctx, pmsg);
1700 if (NT_STATUS_IS_OK(status)) {
1701 return 0;
1702 } else if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1703 return SDB_ERR_NOENTRY;
1704 } else if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1705 int ret = ENOMEM;
1706 krb5_set_error_message(context, ret, "get_sam_result_trust: out of memory");
1707 return ret;
1708 } else {
1709 int ret = EINVAL;
1710 krb5_set_error_message(context, ret, "get_sam_result_trust: %s", nt_errstr(status));
1711 return ret;
1712 }
1713 }
1714
1715 static krb5_error_code samba_kdc_lookup_client(krb5_context context,
1716 struct samba_kdc_db_context *kdc_db_ctx,
1717 TALLOC_CTX *mem_ctx,
1718 krb5_const_principal principal,
1719 const char **attrs,
1720 struct ldb_dn **realm_dn,
1721 struct ldb_message **msg)
1722 {
1723 NTSTATUS nt_status;
1724 char *principal_string = NULL;
1725
1726 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1727 principal_string = smb_krb5_principal_get_comp_string(mem_ctx, context,
1728 principal, 0);
1729 if (principal_string == NULL) {
1730 return ENOMEM;
1731 }
1732 } else {
1733 char *principal_string_m = NULL;
1734 krb5_error_code ret;
1735
1736 ret = krb5_unparse_name(context, principal, &principal_string_m);
1737 if (ret != 0) {
1738 return ret;
1739 }
1740
1741 principal_string = talloc_strdup(mem_ctx, principal_string_m);
1742 SAFE_FREE(principal_string_m);
1743 if (principal_string == NULL) {
1744 return ENOMEM;
1745 }
1746 }
1747
1748 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1749 mem_ctx, principal_string, attrs,
1750 realm_dn, msg);
1751 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1752 krb5_principal fallback_principal = NULL;
1753 unsigned int num_comp;
1754 char *fallback_realm = NULL;
1755 char *fallback_account = NULL;
1756 krb5_error_code ret;
1757
1758 ret = krb5_parse_name(context, principal_string,
1759 &fallback_principal);
1760 TALLOC_FREE(principal_string);
1761 if (ret != 0) {
1762 return ret;
1763 }
1764
1765 num_comp = krb5_princ_size(context, fallback_principal);
1766 fallback_realm = smb_krb5_principal_get_realm(
1767 mem_ctx, context, fallback_principal);
1768 if (fallback_realm == NULL) {
1769 krb5_free_principal(context, fallback_principal);
1770 return ENOMEM;
1771 }
1772
1773 if (num_comp == 1) {
1774 size_t len;
1775
1776 fallback_account = smb_krb5_principal_get_comp_string(mem_ctx,
1777 context, fallback_principal, 0);
1778 if (fallback_account == NULL) {
1779 krb5_free_principal(context, fallback_principal);
1780 TALLOC_FREE(fallback_realm);
1781 return ENOMEM;
1782 }
1783
1784 len = strlen(fallback_account);
1785 if (len >= 2 && fallback_account[len - 1] == '$') {
1786 TALLOC_FREE(fallback_account);
1787 }
1788 }
1789 krb5_free_principal(context, fallback_principal);
1790 fallback_principal = NULL;
1791
1792 if (fallback_account != NULL) {
1793 char *with_dollar;
1794
1795 with_dollar = talloc_asprintf(mem_ctx, "%s$",
1796 fallback_account);
1797 if (with_dollar == NULL) {
1798 TALLOC_FREE(fallback_realm);
1799 return ENOMEM;
1800 }
1801 TALLOC_FREE(fallback_account);
1802
1803 ret = smb_krb5_make_principal(context,
1804 &fallback_principal,
1805 fallback_realm,
1806 with_dollar, NULL);
1807 TALLOC_FREE(with_dollar);
1808 if (ret != 0) {
1809 TALLOC_FREE(fallback_realm);
1810 return ret;
1811 }
1812 }
1813 TALLOC_FREE(fallback_realm);
1814
1815 if (fallback_principal != NULL) {
1816 char *fallback_string = NULL;
1817
1818 ret = krb5_unparse_name(context,
1819 fallback_principal,
1820 &fallback_string);
1821 if (ret != 0) {
1822 krb5_free_principal(context, fallback_principal);
1823 return ret;
1824 }
1825
1826 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1827 mem_ctx,
1828 fallback_string,
1829 attrs,
1830 realm_dn, msg);
1831 SAFE_FREE(fallback_string);
1832 }
1833 krb5_free_principal(context, fallback_principal);
1834 fallback_principal = NULL;
1835 }
1836 TALLOC_FREE(principal_string);
1837
1838 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1839 return SDB_ERR_NOENTRY;
1840 } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1841 return ENOMEM;
1842 } else if (!NT_STATUS_IS_OK(nt_status)) {
1843 return EINVAL;
1844 }
1845
1846 return 0;
1847 }
1848
1849 static krb5_error_code samba_kdc_fetch_client(krb5_context context,
1850 struct samba_kdc_db_context *kdc_db_ctx,
1851 TALLOC_CTX *mem_ctx,
1852 krb5_const_principal principal,
1853 unsigned flags,
1854 struct sdb_entry_ex *entry_ex) {
1855 struct ldb_dn *realm_dn;
1856 krb5_error_code ret;
1857 struct ldb_message *msg = NULL;
1858
1859 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1860 mem_ctx, principal, user_attrs,
1861 &realm_dn, &msg);
1862 if (ret != 0) {
1863 return ret;
1864 }
1865
1866 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1867 principal, SAMBA_KDC_ENT_TYPE_CLIENT,
1868 flags,
1869 realm_dn, msg, entry_ex);
1870 return ret;
1871 }
1872
1873 static krb5_error_code samba_kdc_fetch_krbtgt(krb5_context context,
1874 struct samba_kdc_db_context *kdc_db_ctx,
1875 TALLOC_CTX *mem_ctx,
1876 krb5_const_principal principal,
1877 unsigned flags,
1878 uint32_t kvno,
1879 struct sdb_entry_ex *entry_ex)
1880 {
1881 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1882 krb5_error_code ret;
1883 struct ldb_message *msg = NULL;
1884 struct ldb_dn *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1885 char *realm_from_princ;
1886 char *realm_princ_comp = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 1);
1887
1888 realm_from_princ = smb_krb5_principal_get_realm(
1889 mem_ctx, context, principal);
1890 if (realm_from_princ == NULL) {
1891 /* can't happen */
1892 return SDB_ERR_NOENTRY;
1893 }
1894
1895 if (krb5_princ_size(context, principal) != 2
1896 || (principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME) != 0)) {
1897 /* Not a krbtgt */
1898 return SDB_ERR_NOENTRY;
1899 }
1900
1901 /* krbtgt case. Either us or a trusted realm */
1902
1903 if (lpcfg_is_my_domain_or_realm(lp_ctx, realm_from_princ)
1904 && lpcfg_is_my_domain_or_realm(lp_ctx, realm_princ_comp)) {
1905 /* us, or someone quite like us */
1906 /* Cludge, cludge cludge. If the realm part of krbtgt/realm,
1907 * is in our db, then direct the caller at our primary
1908 * krbtgt */
1909
1910 int lret;
1911 unsigned int krbtgt_number;
1912 /* w2k8r2 sometimes gives us a kvno of 255 for inter-domain
1913 trust tickets. We don't yet know what this means, but we do
1914 seem to need to treat it as unspecified */
1915 if (flags & SDB_F_KVNO_SPECIFIED) {
1916 krbtgt_number = SAMBA_KVNO_GET_KRBTGT(kvno);
1917 if (kdc_db_ctx->rodc) {
1918 if (krbtgt_number != kdc_db_ctx->my_krbtgt_number) {
1919 return SDB_ERR_NOT_FOUND_HERE;
1920 }
1921 }
1922 } else {
1923 krbtgt_number = kdc_db_ctx->my_krbtgt_number;
1924 }
1925
1926 if (krbtgt_number == kdc_db_ctx->my_krbtgt_number) {
1927 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1928 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
1929 krbtgt_attrs, DSDB_SEARCH_NO_GLOBAL_CATALOG,
1930 "(objectClass=user)");
1931 } else {
1932 /* We need to look up an RODC krbtgt (perhaps
1933 * ours, if we are an RODC, perhaps another
1934 * RODC if we are a read-write DC */
1935 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1936 &msg, realm_dn, LDB_SCOPE_SUBTREE,
1937 krbtgt_attrs,
1938 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1939 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=%u))", (unsigned)(krbtgt_number));
1940 }
1941
1942 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1943 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1944 (unsigned)(krbtgt_number));
1945 krb5_set_error_message(context, SDB_ERR_NOENTRY,
1946 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1947 (unsigned)(krbtgt_number));
1948 return SDB_ERR_NOENTRY;
1949 } else if (lret != LDB_SUCCESS) {
1950 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1951 (unsigned)(krbtgt_number));
1952 krb5_set_error_message(context, SDB_ERR_NOENTRY,
1953 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1954 (unsigned)(krbtgt_number));
1955 return SDB_ERR_NOENTRY;
1956 }
1957
1958 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1959 principal, SAMBA_KDC_ENT_TYPE_KRBTGT,
1960 flags, realm_dn, msg, entry_ex);
1961 if (ret != 0) {
1962 krb5_warnx(context, "samba_kdc_fetch: self krbtgt message2entry failed");
1963 }
1964 return ret;
1965
1966 } else {
1967 enum trust_direction direction = UNKNOWN;
1968 const char *realm = NULL;
1969
1970 /* Either an inbound or outbound trust */
1971
1972 if (strcasecmp(lpcfg_realm(lp_ctx), realm_from_princ) == 0) {
1973 /* look for inbound trust */
1974 direction = INBOUND;
1975 realm = realm_princ_comp;
1976 } else if (principal_comp_strcasecmp(context, principal, 1, lpcfg_realm(lp_ctx)) == 0) {
1977 /* look for outbound trust */
1978 direction = OUTBOUND;
1979 realm = realm_from_princ;
1980 } else {
1981 krb5_warnx(context, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1982 realm_from_princ,
1983 realm_princ_comp);
1984 krb5_set_error_message(context, SDB_ERR_NOENTRY, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1985 realm_from_princ,
1986 realm_princ_comp);
1987 return SDB_ERR_NOENTRY;
1988 }
1989
1990 /* Trusted domains are under CN=system */
1991
1992 ret = samba_kdc_lookup_trust(context, kdc_db_ctx->samdb,
1993 mem_ctx,
1994 realm, realm_dn, &msg);
1995
1996 if (ret != 0) {
1997 krb5_warnx(context, "samba_kdc_fetch: could not find principal in DB");
1998 krb5_set_error_message(context, ret, "samba_kdc_fetch: could not find principal in DB");
1999 return ret;
2000 }
2001
2002 ret = samba_kdc_trust_message2entry(context, kdc_db_ctx, mem_ctx,
2003 principal, direction,
2004 realm_dn, flags, kvno, msg, entry_ex);
2005 if (ret != 0) {
2006 krb5_warnx(context, "samba_kdc_fetch: trust_message2entry failed for %s",
2007 ldb_dn_get_linearized(msg->dn));
2008 krb5_set_error_message(context, ret, "samba_kdc_fetch: "
2009 "trust_message2entry failed for %s",
2010 ldb_dn_get_linearized(msg->dn));
2011 }
2012 return ret;
2013 }
2014
2015 }
2016
2017 static krb5_error_code samba_kdc_lookup_server(krb5_context context,
2018 struct samba_kdc_db_context *kdc_db_ctx,
2019 TALLOC_CTX *mem_ctx,
2020 krb5_const_principal principal,
2021 unsigned flags,
2022 const char **attrs,
2023 struct ldb_dn **realm_dn,
2024 struct ldb_message **msg)
2025 {
2026 krb5_error_code ret;
2027 if ((smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL)
2028 && krb5_princ_size(context, principal) >= 2) {
2029 /* 'normal server' case */
2030 int ldb_ret;
2031 NTSTATUS nt_status;
2032 struct ldb_dn *user_dn;
2033 char *principal_string;
2034
2035 ret = krb5_unparse_name_flags(context, principal,
2036 KRB5_PRINCIPAL_UNPARSE_NO_REALM,
2037 &principal_string);
2038 if (ret != 0) {
2039 return ret;
2040 }
2041
2042 /* At this point we may find the host is known to be
2043 * in a different realm, so we should generate a
2044 * referral instead */
2045 nt_status = crack_service_principal_name(kdc_db_ctx->samdb,
2046 mem_ctx, principal_string,
2047 &user_dn, realm_dn);
2048 free(principal_string);
2049
2050 if (!NT_STATUS_IS_OK(nt_status)) {
2051 return SDB_ERR_NOENTRY;
2052 }
2053
2054 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb,
2055 mem_ctx,
2056 msg, user_dn, LDB_SCOPE_BASE,
2057 attrs,
2058 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
2059 "(objectClass=*)");
2060 if (ldb_ret != LDB_SUCCESS) {
2061 return SDB_ERR_NOENTRY;
2062 }
2063 return 0;
2064 } else if (!(flags & SDB_F_FOR_AS_REQ)
2065 && smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
2066 /*
2067 * The behaviour of accepting an
2068 * KRB5_NT_ENTERPRISE_PRINCIPAL server principal
2069 * containing a UPN only applies to TGS-REQ packets,
2070 * not AS-REQ packets.
2071 */
2072 return samba_kdc_lookup_client(context, kdc_db_ctx,
2073 mem_ctx, principal, attrs,
2074 realm_dn, msg);
2075 } else {
2076 /*
2077 * This case is for:
2078 * - the AS-REQ, where we only accept
2079 * samAccountName based lookups for the server, no
2080 * matter if the name is an
2081 * KRB5_NT_ENTERPRISE_PRINCIPAL or not
2082 * - for the TGS-REQ when we are not given an
2083 * KRB5_NT_ENTERPRISE_PRINCIPAL, which also must
2084 * only lookup samAccountName based names.
2085 */
2086 int lret;
2087 char *short_princ;
2088 krb5_principal enterprise_principal = NULL;
2089 krb5_const_principal used_principal = NULL;
2090 char *name1 = NULL;
2091 size_t len1 = 0;
2092 char *filter = NULL;
2093
2094 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
2095 char *str = NULL;
2096 /* Need to reparse the enterprise principal to find the real target */
2097 if (krb5_princ_size(context, principal) != 1) {
2098 ret = KRB5_PARSE_MALFORMED;
2099 krb5_set_error_message(context, ret, "samba_kdc_lookup_server: request for an "
2100 "enterprise principal with wrong (%d) number of components",
2101 krb5_princ_size(context, principal));
2102 return ret;
2103 }
2104 str = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 0);
2105 if (str == NULL) {
2106 return KRB5_PARSE_MALFORMED;
2107 }
2108 ret = krb5_parse_name(context, str,
2109 &enterprise_principal);
2110 talloc_free(str);
2111 if (ret) {
2112 return ret;
2113 }
2114 used_principal = enterprise_principal;
2115 } else {
2116 used_principal = principal;
2117 }
2118
2119 /* server as client principal case, but we must not lookup userPrincipalNames */
2120 *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
2121
2122 /* TODO: Check if it is our realm, otherwise give referral */
2123
2124 ret = krb5_unparse_name_flags(context, used_principal,
2125 KRB5_PRINCIPAL_UNPARSE_NO_REALM |
2126 KRB5_PRINCIPAL_UNPARSE_DISPLAY,
2127 &short_princ);
2128 used_principal = NULL;
2129 krb5_free_principal(context, enterprise_principal);
2130 enterprise_principal = NULL;
2131
2132 if (ret != 0) {
2133 krb5_set_error_message(context, ret, "samba_kdc_lookup_principal: could not parse principal");
2134 krb5_warnx(context, "samba_kdc_lookup_principal: could not parse principal");
2135 return ret;
2136 }
2137
2138 name1 = ldb_binary_encode_string(mem_ctx, short_princ);
2139 SAFE_FREE(short_princ);
2140 if (name1 == NULL) {
2141 return ENOMEM;
2142 }
2143 len1 = strlen(name1);
2144 if (len1 >= 1 && name1[len1 - 1] != '$') {
2145 filter = talloc_asprintf(mem_ctx,
2146 "(&(objectClass=user)(|(samAccountName=%s)(samAccountName=%s$)))",
2147 name1, name1);
2148 if (filter == NULL) {
2149 return ENOMEM;
2150 }
2151 } else {
2152 filter = talloc_asprintf(mem_ctx,
2153 "(&(objectClass=user)(samAccountName=%s))",
2154 name1);
2155 if (filter == NULL) {
2156 return ENOMEM;
2157 }
2158 }
2159
2160 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx, msg,
2161 *realm_dn, LDB_SCOPE_SUBTREE,
2162 attrs,
2163 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
2164 "%s", filter);
2165 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
2166 DEBUG(10, ("Failed to find an entry for %s filter:%s\n",
2167 name1, filter));
2168 return SDB_ERR_NOENTRY;
2169 }
2170 if (lret == LDB_ERR_CONSTRAINT_VIOLATION) {
2171 DEBUG(10, ("Failed to find unique entry for %s filter:%s\n",
2172 name1, filter));
2173 return SDB_ERR_NOENTRY;
2174 }
2175 if (lret != LDB_SUCCESS) {
2176 DEBUG(0, ("Failed single search for %s - %s\n",
2177 name1, ldb_errstring(kdc_db_ctx->samdb)));
2178 return SDB_ERR_NOENTRY;
2179 }
2180 return 0;
2181 }
2182 return SDB_ERR_NOENTRY;
2183 }
2184
2185
2186
2187 static krb5_error_code samba_kdc_fetch_server(krb5_context context,
2188 struct samba_kdc_db_context *kdc_db_ctx,
2189 TALLOC_CTX *mem_ctx,
2190 krb5_const_principal principal,
2191 unsigned flags,
2192 struct sdb_entry_ex *entry_ex)
2193 {
2194 krb5_error_code ret;
2195 struct ldb_dn *realm_dn;
2196 struct ldb_message *msg;
2197
2198 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, principal,
2199 flags, server_attrs, &realm_dn, &msg);
2200 if (ret != 0) {
2201 return ret;
2202 }
2203
2204 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
2205 principal, SAMBA_KDC_ENT_TYPE_SERVER,
2206 flags,
2207 realm_dn, msg, entry_ex);
2208 if (ret != 0) {
2209 krb5_warnx(context, "samba_kdc_fetch: message2entry failed");
2210 }
2211
2212 return ret;
2213 }
2214
2215 static krb5_error_code samba_kdc_lookup_realm(krb5_context context,
2216 struct samba_kdc_db_context *kdc_db_ctx,
2217 TALLOC_CTX *mem_ctx,
2218 krb5_const_principal principal,
2219 unsigned flags,
2220 struct sdb_entry_ex *entry_ex)
2221 {
2222 TALLOC_CTX *frame = talloc_stackframe();
2223 NTSTATUS status;
2224 krb5_error_code ret;
2225 bool check_realm = false;
2226 const char *realm = NULL;
2227 struct dsdb_trust_routing_table *trt = NULL;
2228 const struct lsa_TrustDomainInfoInfoEx *tdo = NULL;
2229 unsigned int num_comp;
2230 bool ok;
2231 char *upper = NULL;
2232
2233 num_comp = krb5_princ_size(context, principal);
2234
2235 if (flags & SDB_F_GET_CLIENT) {
2236 if (flags & SDB_F_FOR_AS_REQ) {
2237 check_realm = true;
2238 }
2239 }
2240 if (flags & SDB_F_GET_SERVER) {
2241 if (flags & SDB_F_FOR_TGS_REQ) {
2242 check_realm = true;
2243 }
2244 }
2245
2246 if (!check_realm) {
2247 TALLOC_FREE(frame);
2248 return 0;
2249 }
2250
2251 realm = smb_krb5_principal_get_realm(frame, context, principal);
2252 if (realm == NULL) {
2253 TALLOC_FREE(frame);
2254 return ENOMEM;
2255 }
2256
2257 /*
2258 * The requested realm needs to be our own
2259 */
2260 ok = lpcfg_is_my_domain_or_realm(kdc_db_ctx->lp_ctx, realm);
2261 if (!ok) {
2262 /*
2263 * The request is not for us...
2264 */
2265 TALLOC_FREE(frame);
2266 return SDB_ERR_NOENTRY;
2267 }
2268
2269 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
2270 char *principal_string = NULL;
2271 krb5_principal enterprise_principal = NULL;
2272 char *enterprise_realm = NULL;
2273
2274 if (num_comp != 1) {
2275 TALLOC_FREE(frame);
2276 return SDB_ERR_NOENTRY;
2277 }
2278
2279 principal_string = smb_krb5_principal_get_comp_string(frame, context,
2280 principal, 0);
2281 if (principal_string == NULL) {
2282 TALLOC_FREE(frame);
2283 return ENOMEM;
2284 }
2285
2286 ret = krb5_parse_name(context, principal_string,
2287 &enterprise_principal);
2288 TALLOC_FREE(principal_string);
2289 if (ret) {
2290 TALLOC_FREE(frame);
2291 return ret;
2292 }
2293
2294 enterprise_realm = smb_krb5_principal_get_realm(
2295 frame, context, enterprise_principal);
2296 krb5_free_principal(context, enterprise_principal);
2297 if (enterprise_realm != NULL) {
2298 realm = enterprise_realm;
2299 }
2300 }
2301
2302 if (flags & SDB_F_GET_SERVER) {
2303 char *service_realm = NULL;
2304
2305 ret = principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME);
2306 if (ret == 0) {
2307 /*
2308 * we need to search krbtgt/ locally
2309 */
2310 TALLOC_FREE(frame);
2311 return 0;
2312 }
2313
2314 /*
2315 * We need to check the last component against the routing table.
2316 *
2317 * Note this works only with 2 or 3 component principals, e.g:
2318 *
2319 * servicePrincipalName: ldap/W2K8R2-219.bla.base
2320 * servicePrincipalName: ldap/W2K8R2-219.bla.base/bla.base
2321 * servicePrincipalName: ldap/W2K8R2-219.bla.base/ForestDnsZones.bla.base
2322 * servicePrincipalName: ldap/W2K8R2-219.bla.base/DomainDnsZones.bla.base
2323 */
2324
2325 if (num_comp == 2 || num_comp == 3) {
2326 service_realm = smb_krb5_principal_get_comp_string(frame,
2327 context,
2328 principal,
2329 num_comp - 1);
2330 }
2331
2332 if (service_realm != NULL) {
2333 realm = service_realm;
2334 }
2335 }
2336
2337 ok = lpcfg_is_my_domain_or_realm(kdc_db_ctx->lp_ctx, realm);
2338 if (ok) {
2339 /*
2340 * skip the expensive routing lookup
2341 */
2342 TALLOC_FREE(frame);
2343 return 0;
2344 }
2345
2346 status = dsdb_trust_routing_table_load(kdc_db_ctx->samdb,
2347 frame, &trt);
2348 if (!NT_STATUS_IS_OK(status)) {
2349 TALLOC_FREE(frame);
2350 return EINVAL;
2351 }
2352
2353 tdo = dsdb_trust_routing_by_name(trt, realm);
2354 if (tdo == NULL) {
2355 /*
2356 * This principal has to be local
2357 */
2358 TALLOC_FREE(frame);
2359 return 0;
2360 }
2361
2362 if (tdo->trust_attributes & LSA_TRUST_ATTRIBUTE_WITHIN_FOREST) {
2363 /*
2364 * TODO: handle the routing within the forest
2365 *
2366 * This should likely be handled in
2367 * samba_kdc_message2entry() in case we're
2368 * a global catalog. We'd need to check
2369 * if realm_dn is our own domain and derive
2370 * the dns domain name from realm_dn and check that
2371 * against the routing table or fallback to
2372 * the tdo we found here.
2373 *
2374 * But for now we don't support multiple domains
2375 * in our forest correctly anyway.
2376 *
2377 * Just search in our local database.
2378 */
2379 TALLOC_FREE(frame);
2380 return 0;
2381 }
2382
2383 ZERO_STRUCT(entry_ex->entry);
2384
2385 ret = krb5_copy_principal(context, principal,
2386 &entry_ex->entry.principal);
2387 if (ret) {
2388 TALLOC_FREE(frame);
2389 return ret;
2390 }
2391
2392 upper = strupper_talloc(frame, tdo->domain_name.string);
2393 if (upper == NULL) {
2394 TALLOC_FREE(frame);
2395 return ENOMEM;
2396 }
2397
2398 ret = smb_krb5_principal_set_realm(context,
2399 entry_ex->entry.principal,
2400 upper);
2401 if (ret) {
2402 TALLOC_FREE(frame);
2403 return ret;
2404 }
2405
2406 TALLOC_FREE(frame);
2407 return SDB_ERR_WRONG_REALM;
2408 }
2409
2410 krb5_error_code samba_kdc_fetch(krb5_context context,
2411 struct samba_kdc_db_context *kdc_db_ctx,
2412 krb5_const_principal principal,
2413 unsigned flags,
2414 krb5_kvno kvno,
2415 struct sdb_entry_ex *entry_ex)
2416 {
2417 krb5_error_code ret = SDB_ERR_NOENTRY;
2418 TALLOC_CTX *mem_ctx;
2419
2420 mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_fetch context");
2421 if (!mem_ctx) {
2422 ret = ENOMEM;
2423 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2424 return ret;
2425 }
2426
2427 ret = samba_kdc_lookup_realm(context, kdc_db_ctx, mem_ctx,
2428 principal, flags, entry_ex);
2429 if (ret != 0) {
2430 goto done;
2431 }
2432
2433 ret = SDB_ERR_NOENTRY;
2434
2435 if (flags & SDB_F_GET_CLIENT) {
2436 ret = samba_kdc_fetch_client(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
2437 if (ret != SDB_ERR_NOENTRY) goto done;
2438 }
2439 if (flags & SDB_F_GET_SERVER) {
2440 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
2441 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
2442 if (ret != SDB_ERR_NOENTRY) goto done;
2443
2444 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
2445 ret = samba_kdc_fetch_server(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
2446 if (ret != SDB_ERR_NOENTRY) goto done;
2447 }
2448 if (flags & SDB_F_GET_KRBTGT) {
2449 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
2450 if (ret != SDB_ERR_NOENTRY) goto done;
2451 }
2452
2453 done:
2454 talloc_free(mem_ctx);
2455 return ret;
2456 }
2457
2458 struct samba_kdc_seq {
2459 unsigned int index;
2460 unsigned int count;
2461 struct ldb_message **msgs;
2462 struct ldb_dn *realm_dn;
2463 };
2464
2465 static krb5_error_code samba_kdc_seq(krb5_context context,
2466 struct samba_kdc_db_context *kdc_db_ctx,
2467 struct sdb_entry_ex *entry)
2468 {
2469 krb5_error_code ret;
2470 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
2471 const char *realm = lpcfg_realm(kdc_db_ctx->lp_ctx);
2472 struct ldb_message *msg = NULL;
2473 const char *sAMAccountName = NULL;
2474 krb5_principal principal = NULL;
2475 TALLOC_CTX *mem_ctx;
2476
2477 if (!priv) {
2478 return SDB_ERR_NOENTRY;
2479 }
2480
2481 mem_ctx = talloc_named(priv, 0, "samba_kdc_seq context");
2482
2483 if (!mem_ctx) {
2484 ret = ENOMEM;
2485 krb5_set_error_message(context, ret, "samba_kdc_seq: talloc_named() failed!");
2486 return ret;
2487 }
2488
2489 while (priv->index < priv->count) {
2490 msg = priv->msgs[priv->index++];
2491
2492 sAMAccountName = ldb_msg_find_attr_as_string(msg, "sAMAccountName", NULL);
2493 if (sAMAccountName != NULL) {
2494 break;
2495 }
2496 }
2497
2498 if (sAMAccountName == NULL) {
2499 ret = SDB_ERR_NOENTRY;
2500 goto out;
2501 }
2502
2503 ret = smb_krb5_make_principal(context, &principal,
2504 realm, sAMAccountName, NULL);
2505 if (ret != 0) {
2506 goto out;
2507 }
2508
2509 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
2510 principal, SAMBA_KDC_ENT_TYPE_ANY,
2511 SDB_F_ADMIN_DATA|SDB_F_GET_ANY,
2512 priv->realm_dn, msg, entry);
2513
2514 out:
2515 if (principal != NULL) {
2516 krb5_free_principal(context, principal);
2517 }
2518
2519 if (ret != 0) {
2520 TALLOC_FREE(priv);
2521 kdc_db_ctx->seq_ctx = NULL;
2522 } else {
2523 talloc_free(mem_ctx);
2524 }
2525
2526 return ret;
2527 }
2528
2529 krb5_error_code samba_kdc_firstkey(krb5_context context,
2530 struct samba_kdc_db_context *kdc_db_ctx,
2531 struct sdb_entry_ex *entry)
2532 {
2533 struct ldb_context *ldb_ctx = kdc_db_ctx->samdb;
2534 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
2535 char *realm;
2536 struct ldb_result *res = NULL;
2537 krb5_error_code ret;
2538 TALLOC_CTX *mem_ctx;
2539 int lret;
2540
2541 if (priv) {
2542 TALLOC_FREE(priv);
2543 kdc_db_ctx->seq_ctx = NULL;
2544 }
2545
2546 priv = (struct samba_kdc_seq *) talloc(kdc_db_ctx, struct samba_kdc_seq);
2547 if (!priv) {
2548 ret = ENOMEM;
2549 krb5_set_error_message(context, ret, "talloc: out of memory");
2550 return ret;
2551 }
2552
2553 priv->index = 0;
2554 priv->msgs = NULL;
2555 priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
2556 priv->count = 0;
2557
2558 mem_ctx = talloc_named(priv, 0, "samba_kdc_firstkey context");
2559
2560 if (!mem_ctx) {
2561 ret = ENOMEM;
2562 krb5_set_error_message(context, ret, "samba_kdc_firstkey: talloc_named() failed!");
2563 return ret;
2564 }
2565
2566 ret = krb5_get_default_realm(context, &realm);
2567 if (ret != 0) {
2568 TALLOC_FREE(priv);
2569 return ret;
2570 }
2571 krb5_free_default_realm(context, realm);
2572
2573 lret = dsdb_search(ldb_ctx, priv, &res,
2574 priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
2575 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2576 "(objectClass=user)");
2577
2578 if (lret != LDB_SUCCESS) {
2579 TALLOC_FREE(priv);
2580 return SDB_ERR_NOENTRY;
2581 }
2582
2583 priv->count = res->count;
2584 priv->msgs = talloc_steal(priv, res->msgs);
2585 talloc_free(res);
2586
2587 kdc_db_ctx->seq_ctx = priv;
2588
2589 ret = samba_kdc_seq(context, kdc_db_ctx, entry);
2590
2591 if (ret != 0) {
2592 TALLOC_FREE(priv);
2593 kdc_db_ctx->seq_ctx = NULL;
2594 } else {
2595 talloc_free(mem_ctx);
2596 }
2597 return ret;
2598 }
2599
2600 krb5_error_code samba_kdc_nextkey(krb5_context context,
2601 struct samba_kdc_db_context *kdc_db_ctx,
2602 struct sdb_entry_ex *entry)
2603 {
2604 return samba_kdc_seq(context, kdc_db_ctx, entry);
2605 }
2606
2607 /* Check if a given entry may delegate or do s4u2self to this target principal
2608 *
2609 * The safest way to determine 'self' is to check the DB record made at
2610 * the time the principal was presented to the KDC.
2611 */
2612 krb5_error_code
2613 samba_kdc_check_s4u2self(krb5_context context,
2614 struct samba_kdc_entry *skdc_entry_client,
2615 struct samba_kdc_entry *skdc_entry_server_target)
2616 {
2617 struct dom_sid *orig_sid;
2618 struct dom_sid *target_sid;
2619 TALLOC_CTX *frame = talloc_stackframe();
2620
2621 orig_sid = samdb_result_dom_sid(frame,
2622 skdc_entry_client->msg,
2623 "objectSid");
2624 target_sid = samdb_result_dom_sid(frame,
2625 skdc_entry_server_target->msg,
2626 "objectSid");
2627
2628 /*
2629 * Allow delegation to the same record (representing a
2630 * principal), even if by a different name. The easy and safe
2631 * way to prove this is by SID comparison
2632 */
2633 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2634 talloc_free(frame);
2635 return KRB5KRB_AP_ERR_BADMATCH;
2636 }
2637
2638 talloc_free(frame);
2639 return 0;
2640 }
2641
2642 /* Certificates printed by a the Certificate Authority might have a
2643 * slightly different form of the user principal name to that in the
2644 * database. Allow a mismatch where they both refer to the same
2645 * SID */
2646
2647 krb5_error_code
2648 samba_kdc_check_pkinit_ms_upn_match(krb5_context context,
2649 struct samba_kdc_db_context *kdc_db_ctx,
2650 struct samba_kdc_entry *skdc_entry,
2651 krb5_const_principal certificate_principal)
2652 {
2653 krb5_error_code ret;
2654 struct ldb_dn *realm_dn;
2655 struct ldb_message *msg;
2656 struct dom_sid *orig_sid;
2657 struct dom_sid *target_sid;
2658 const char *ms_upn_check_attrs[] = {
2659 "objectSid", NULL
2660 };
2661
2662 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_pkinit_ms_upn_match");
2663
2664 if (!mem_ctx) {
2665 ret = ENOMEM;
2666 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2667 return ret;
2668 }
2669
2670 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
2671 mem_ctx, certificate_principal,
2672 ms_upn_check_attrs, &realm_dn, &msg);
2673
2674 if (ret != 0) {
2675 talloc_free(mem_ctx);
2676 return ret;
2677 }
2678
2679 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2680 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2681
2682 /* Consider these to be the same principal, even if by a different
2683 * name. The easy and safe way to prove this is by SID
2684 * comparison */
2685 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2686 talloc_free(mem_ctx);
2687 #if defined(KRB5KDC_ERR_CLIENT_NAME_MISMATCH) /* MIT */
2688 return KRB5KDC_ERR_CLIENT_NAME_MISMATCH;
2689 #else /* Heimdal (where this is an enum) */
2690 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
2691 #endif
2692 }
2693
2694 talloc_free(mem_ctx);
2695 return ret;
2696 }
2697
2698 /*
2699 * Check if a given entry may delegate to this target principal
2700 * with S4U2Proxy.
2701 */
2702 krb5_error_code
2703 samba_kdc_check_s4u2proxy(krb5_context context,
2704 struct samba_kdc_db_context *kdc_db_ctx,
2705 struct samba_kdc_entry *skdc_entry,
2706 krb5_const_principal target_principal)
2707 {
2708 krb5_error_code ret;
2709 char *tmp = NULL;
2710 const char *client_dn = NULL;
2711 const char *target_principal_name = NULL;
2712 struct ldb_message_element *el;
2713 struct ldb_val val;
2714 unsigned int i;
2715 bool found = false;
2716
2717 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2proxy");
2718
2719 if (!mem_ctx) {
2720 ret = ENOMEM;
2721 krb5_set_error_message(context, ret,
2722 "samba_kdc_check_s4u2proxy:"
2723 " talloc_named() failed!");
2724 return ret;
2725 }
2726
2727 client_dn = ldb_dn_get_linearized(skdc_entry->msg->dn);
2728 if (!client_dn) {
2729 if (errno == 0) {
2730 errno = ENOMEM;
2731 }
2732 ret = errno;
2733 krb5_set_error_message(context, ret,
2734 "samba_kdc_check_s4u2proxy:"
2735 " ldb_dn_get_linearized() failed!");
2736 return ret;
2737 }
2738
2739 /*
2740 * The main heimdal code already checked that the target_principal
2741 * belongs to the same realm as the client.
2742 *
2743 * So we just need the principal without the realm,
2744 * as that is what is configured in the "msDS-AllowedToDelegateTo"
2745 * attribute.
2746 */
2747 ret = krb5_unparse_name_flags(context, target_principal,
2748 KRB5_PRINCIPAL_UNPARSE_NO_REALM, &tmp);
2749 if (ret) {
2750 talloc_free(mem_ctx);
2751 krb5_set_error_message(context, ret,
2752 "samba_kdc_check_s4u2proxy:"
2753 " krb5_unparse_name() failed!");
2754 return ret;
2755 }
2756 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] for target[%s]\n",
2757 client_dn, tmp));
2758
2759 target_principal_name = talloc_strdup(mem_ctx, tmp);
2760 SAFE_FREE(tmp);
2761 if (target_principal_name == NULL) {
2762 ret = ENOMEM;
2763 krb5_set_error_message(context, ret,
2764 "samba_kdc_check_s4u2proxy:"
2765 " talloc_strdup() failed!");
2766 return ret;
2767 }
2768
2769 el = ldb_msg_find_element(skdc_entry->msg, "msDS-AllowedToDelegateTo");
2770 if (el == NULL) {
2771 goto bad_option;
2772 }
2773
2774 val = data_blob_string_const(target_principal_name);
2775
2776 for (i=0; i<el->num_values; i++) {
2777 struct ldb_val *val1 = &val;
2778 struct ldb_val *val2 = &el->values[i];
2779 int cmp;
2780
2781 if (val1->length != val2->length) {
2782 continue;
2783 }
2784
2785 cmp = strncasecmp((const char *)val1->data,
2786 (const char *)val2->data,
2787 val1->length);
2788 if (cmp != 0) {
2789 continue;
2790 }
2791
2792 found = true;
2793 break;
2794 }
2795
2796 if (!found) {
2797 goto bad_option;
2798 }
2799
2800 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] allowed target[%s]\n",
2801 client_dn, tmp));
2802 talloc_free(mem_ctx);
2803 return 0;
2804
2805 bad_option:
2806 krb5_set_error_message(context, ret,
2807 "samba_kdc_check_s4u2proxy: client[%s] "
2808 "not allowed for delegation to target[%s]",
2809 client_dn,
2810 target_principal_name);
2811 talloc_free(mem_ctx);
2812 return KRB5KDC_ERR_BADOPTION;
2813 }
2814
2815 NTSTATUS samba_kdc_setup_db_ctx(TALLOC_CTX *mem_ctx, struct samba_kdc_base_context *base_ctx,
2816 struct samba_kdc_db_context **kdc_db_ctx_out)
2817 {
2818 int ldb_ret;
2819 struct ldb_message *msg;
2820 struct auth_session_info *session_info;
2821 struct samba_kdc_db_context *kdc_db_ctx;
2822 /* The idea here is very simple. Using Kerberos to
2823 * authenticate the KDC to the LDAP server is higly likely to
2824 * be circular.
2825 *
2826 * In future we may set this up to use EXERNAL and SSL
2827 * certificates, for now it will almost certainly be NTLMSSP_SET_USERNAME
2828 */
2829
2830 kdc_db_ctx = talloc_zero(mem_ctx, struct samba_kdc_db_context);
2831 if (kdc_db_ctx == NULL) {
2832 return NT_STATUS_NO_MEMORY;
2833 }
2834 kdc_db_ctx->ev_ctx = base_ctx->ev_ctx;
2835 kdc_db_ctx->lp_ctx = base_ctx->lp_ctx;
2836 kdc_db_ctx->msg_ctx = base_ctx->msg_ctx;
2837
2838 /* get default kdc policy */
2839 lpcfg_default_kdc_policy(mem_ctx,
2840 base_ctx->lp_ctx,
2841 &kdc_db_ctx->policy.svc_tkt_lifetime,
2842 &kdc_db_ctx->policy.usr_tkt_lifetime,
2843 &kdc_db_ctx->policy.renewal_lifetime);
2844
2845 session_info = system_session(kdc_db_ctx->lp_ctx);
2846 if (session_info == NULL) {
2847 return NT_STATUS_INTERNAL_ERROR;
2848 }
2849
2850 /* Setup the link to LDB */
2851 kdc_db_ctx->samdb = samdb_connect(kdc_db_ctx,
2852 base_ctx->ev_ctx,
2853 base_ctx->lp_ctx,
2854 session_info,
2855 NULL,
2856 0);
2857 if (kdc_db_ctx->samdb == NULL) {
2858 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot open samdb for KDC backend!"));
2859 talloc_free(kdc_db_ctx);
2860 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2861 }
2862
2863 /* Find out our own krbtgt kvno */
2864 ldb_ret = samdb_rodc(kdc_db_ctx->samdb, &kdc_db_ctx->rodc);
2865 if (ldb_ret != LDB_SUCCESS) {
2866 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine if we are an RODC in KDC backend: %s\n",
2867 ldb_errstring(kdc_db_ctx->samdb)));
2868 talloc_free(kdc_db_ctx);
2869 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2870 }
2871 if (kdc_db_ctx->rodc) {
2872 int my_krbtgt_number;
2873 const char *secondary_keytab[] = { "msDS-SecondaryKrbTgtNumber", NULL };
2874 struct ldb_dn *account_dn;
2875 struct ldb_dn *server_dn = samdb_server_dn(kdc_db_ctx->samdb, kdc_db_ctx);
2876 if (!server_dn) {
2877 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server DN in KDC backend: %s\n",
2878 ldb_errstring(kdc_db_ctx->samdb)));
2879 talloc_free(kdc_db_ctx);
2880 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2881 }
2882
2883 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, server_dn,
2884 "serverReference", &account_dn);
2885 if (ldb_ret != LDB_SUCCESS) {
2886 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server account in KDC backend: %s\n",
2887 ldb_errstring(kdc_db_ctx->samdb)));
2888 talloc_free(kdc_db_ctx);
2889 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2890 }
2891
2892 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, account_dn,
2893 "msDS-KrbTgtLink", &kdc_db_ctx->krbtgt_dn);
2894 talloc_free(account_dn);
2895 if (ldb_ret != LDB_SUCCESS) {
2896 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine RODC krbtgt account in KDC backend: %s\n",
2897 ldb_errstring(kdc_db_ctx->samdb)));
2898 talloc_free(kdc_db_ctx);
2899 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2900 }
2901
2902 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2903 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
2904 secondary_keytab,
2905 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2906 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=*))");
2907 if (ldb_ret != LDB_SUCCESS) {
2908 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read krbtgt account %s in KDC backend to get msDS-SecondaryKrbTgtNumber: %s: %s\n",
2909 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2910 ldb_errstring(kdc_db_ctx->samdb),
2911 ldb_strerror(ldb_ret)));
2912 talloc_free(kdc_db_ctx);
2913 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2914 }
2915 my_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
2916 if (my_krbtgt_number == -1) {
2917 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read msDS-SecondaryKrbTgtNumber from krbtgt account %s in KDC backend: got %d\n",
2918 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2919 my_krbtgt_number));
2920 talloc_free(kdc_db_ctx);
2921 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2922 }
2923 kdc_db_ctx->my_krbtgt_number = my_krbtgt_number;
2924
2925 } else {
2926 kdc_db_ctx->my_krbtgt_number = 0;
2927 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2928 &msg,
2929 ldb_get_default_basedn(kdc_db_ctx->samdb),
2930 LDB_SCOPE_SUBTREE,
2931 krbtgt_attrs,
2932 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2933 "(&(objectClass=user)(samAccountName=krbtgt))");
2934
2935 if (ldb_ret != LDB_SUCCESS) {
2936 DEBUG(1, ("samba_kdc_fetch: could not find own KRBTGT in DB: %s\n", ldb_errstring(kdc_db_ctx->samdb)));
2937 talloc_free(kdc_db_ctx);
2938 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2939 }
2940 kdc_db_ctx->krbtgt_dn = talloc_steal(kdc_db_ctx, msg->dn);
2941 kdc_db_ctx->my_krbtgt_number = 0;
2942 talloc_free(msg);
2943 }
2944 *kdc_db_ctx_out = kdc_db_ctx;
2945 return NT_STATUS_OK;
2946 }
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