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s4:kdc: only support LSA_TRUST_TYPE_UPLEVEL domains in samba_kdc_trust_message2entry()
[Samba.git] / source4 / kdc / db-glue.c
blob9d633a6e528393bfbbb973efbf05b093e3082e68
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->kdc_db_ctx = kdc_db_ctx;
832 p->realm_dn = talloc_reference(p, realm_dn);
833 if (!p->realm_dn) {
834 ret = ENOMEM;
835 goto out;
836 }
837
838 talloc_set_destructor(p, samba_kdc_entry_destructor);
839
840 entry_ex->ctx = p;
841
842 userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
843
844 msDS_User_Account_Control_Computed
845 = ldb_msg_find_attr_as_uint(msg,
846 "msDS-User-Account-Control-Computed",
847 UF_ACCOUNTDISABLE);
848
849 /*
850 * This brings in the lockout flag, block the account if not
851 * found. We need the weird UF_ACCOUNTDISABLE check because
852 * we do not want to fail open if the value is not returned,
853 * but 0 is a valid value (all OK)
854 */
855 if (msDS_User_Account_Control_Computed == UF_ACCOUNTDISABLE) {
856 ret = EINVAL;
857 krb5_set_error_message(context, ret, "samba_kdc_message2entry: "
858 "no msDS-User-Account-Control-Computed present");
859 goto out;
860 } else {
861 userAccountControl |= msDS_User_Account_Control_Computed;
862 }
863
864 /*
865 * If we are set to canonicalize, we get back the fixed UPPER
866 * case realm, and the real username (ie matching LDAP
867 * samAccountName)
868 *
869 * Otherwise, if we are set to enterprise, we
870 * get back the whole principal as-sent
871 *
872 * Finally, if we are not set to canonicalize, we get back the
873 * fixed UPPER case realm, but the as-sent username
874 */
875
876 if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT) {
877 if (flags & (SDB_F_CANON)) {
878 /*
879 * When requested to do so, ensure that the
880 * both realm values in the principal are set
881 * to the upper case, canonical realm
882 */
883 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal,
884 lpcfg_realm(lp_ctx), "krbtgt",
885 lpcfg_realm(lp_ctx), NULL);
886 if (ret) {
887 krb5_clear_error_message(context);
888 goto out;
889 }
890 smb_krb5_principal_set_type(context, entry_ex->entry.principal, KRB5_NT_SRV_INST);
891 } else {
892 ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
893 if (ret) {
894 krb5_clear_error_message(context);
895 goto out;
896 }
897 /*
898 * this appears to be required regardless of
899 * the canonicalize flag from the client
900 */
901 ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
902 if (ret) {
903 krb5_clear_error_message(context);
904 goto out;
905 }
906 }
907
908 } else if (ent_type == SAMBA_KDC_ENT_TYPE_ANY && principal == NULL) {
909 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
910 if (ret) {
911 krb5_clear_error_message(context);
912 goto out;
913 }
914 } else if (flags & SDB_F_CANON && flags & SDB_F_FOR_AS_REQ) {
915 /*
916 * SDB_F_CANON maps from the canonicalize flag in the
917 * packet, and has a different meaning between AS-REQ
918 * and TGS-REQ. We only change the principal in the AS-REQ case
919 */
920 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
921 if (ret) {
922 krb5_clear_error_message(context);
923 goto out;
924 }
925 } else {
926 ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
927 if (ret) {
928 krb5_clear_error_message(context);
929 goto out;
930 }
931
932 if (smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL) {
933 /* While we have copied the client principal, tests
934 * show that Win2k3 returns the 'corrected' realm, not
935 * the client-specified realm. This code attempts to
936 * replace the client principal's realm with the one
937 * we determine from our records */
938
939 /* this has to be with malloc() */
940 ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
941 if (ret) {
942 krb5_clear_error_message(context);
943 goto out;
944 }
945 }
946 }
947
948 /* First try and figure out the flags based on the userAccountControl */
949 entry_ex->entry.flags = uf2SDBFlags(context, userAccountControl, ent_type);
950
951 /* Windows 2008 seems to enforce this (very sensible) rule by
952 * default - don't allow offline attacks on a user's password
953 * by asking for a ticket to them as a service (encrypted with
954 * their probably patheticly insecure password) */
955
956 if (entry_ex->entry.flags.server
957 && lpcfg_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
958 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
959 entry_ex->entry.flags.server = 0;
960 }
961 }
962 /*
963 * To give the correct type of error to the client, we must
964 * not just return the entry without .server set, we must
965 * pretend the principal does not exist. Otherwise we may
966 * return ERR_POLICY instead of
967 * KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
968 */
969 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER && entry_ex->entry.flags.server == 0) {
970 ret = SDB_ERR_NOENTRY;
971 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no servicePrincipalName present for this server, refusing with no-such-entry");
972 goto out;
973 }
974 if (flags & SDB_F_ADMIN_DATA) {
975 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
976 * of the Heimdal KDC. They are stored in a the traditional
977 * DB for audit purposes, and still form part of the structure
978 * we must return */
979
980 /* use 'whenCreated' */
981 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
982 /* use 'kadmin' for now (needed by mit_samba) */
983
984 ret = smb_krb5_make_principal(context,
985 &entry_ex->entry.created_by.principal,
986 lpcfg_realm(lp_ctx), "kadmin", NULL);
987 if (ret) {
988 krb5_clear_error_message(context);
989 goto out;
990 }
991
992 entry_ex->entry.modified_by = (struct sdb_event *) malloc(sizeof(struct sdb_event));
993 if (entry_ex->entry.modified_by == NULL) {
994 ret = ENOMEM;
995 krb5_set_error_message(context, ret, "malloc: out of memory");
996 goto out;
997 }
998
999 /* use 'whenChanged' */
1000 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
1001 /* use 'kadmin' for now (needed by mit_samba) */
1002 ret = smb_krb5_make_principal(context,
1003 &entry_ex->entry.modified_by->principal,
1004 lpcfg_realm(lp_ctx), "kadmin", NULL);
1005 if (ret) {
1006 krb5_clear_error_message(context);
1007 goto out;
1008 }
1009 }
1010
1011
1012 /* The lack of password controls etc applies to krbtgt by
1013 * virtue of being that particular RID */
1014 status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
1015
1016 if (!NT_STATUS_IS_OK(status)) {
1017 ret = EINVAL;
1018 goto out;
1019 }
1020
1021 if (rid == DOMAIN_RID_KRBTGT) {
1022 char *realm = NULL;
1023
1024 entry_ex->entry.valid_end = NULL;
1025 entry_ex->entry.pw_end = NULL;
1026
1027 entry_ex->entry.flags.invalid = 0;
1028 entry_ex->entry.flags.server = 1;
1029
1030 realm = smb_krb5_principal_get_realm(context, principal);
1031 if (realm == NULL) {
1032 ret = ENOMEM;
1033 goto out;
1034 }
1035
1036 /* Don't mark all requests for the krbtgt/realm as
1037 * 'change password', as otherwise we could get into
1038 * trouble, and not enforce the password expirty.
1039 * Instead, only do it when request is for the kpasswd service */
1040 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER
1041 && krb5_princ_size(context, principal) == 2
1042 && (principal_comp_strcmp(context, principal, 0, "kadmin") == 0)
1043 && (principal_comp_strcmp(context, principal, 1, "changepw") == 0)
1044 && lpcfg_is_my_domain_or_realm(lp_ctx, realm)) {
1045 entry_ex->entry.flags.change_pw = 1;
1046 }
1047
1048 SAFE_FREE(realm);
1049
1050 entry_ex->entry.flags.client = 0;
1051 entry_ex->entry.flags.forwardable = 1;
1052 entry_ex->entry.flags.ok_as_delegate = 1;
1053 } else if (is_rodc) {
1054 /* The RODC krbtgt account is like the main krbtgt,
1055 * but it does not have a changepw or kadmin
1056 * service */
1057
1058 entry_ex->entry.valid_end = NULL;
1059 entry_ex->entry.pw_end = NULL;
1060
1061 /* Also don't allow the RODC krbtgt to be a client (it should not be needed) */
1062 entry_ex->entry.flags.client = 0;
1063 entry_ex->entry.flags.invalid = 0;
1064 entry_ex->entry.flags.server = 1;
1065
1066 entry_ex->entry.flags.client = 0;
1067 entry_ex->entry.flags.forwardable = 1;
1068 entry_ex->entry.flags.ok_as_delegate = 0;
1069 } else if (entry_ex->entry.flags.server && ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
1070 /* The account/password expiry only applies when the account is used as a
1071 * client (ie password login), not when used as a server */
1072
1073 /* Make very well sure we don't use this for a client,
1074 * it could bypass the password restrictions */
1075 entry_ex->entry.flags.client = 0;
1076
1077 entry_ex->entry.valid_end = NULL;
1078 entry_ex->entry.pw_end = NULL;
1079
1080 } else {
1081 NTTIME must_change_time
1082 = samdb_result_nttime(msg,
1083 "msDS-UserPasswordExpiryTimeComputed",
1084 0);
1085 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
1086 entry_ex->entry.pw_end = NULL;
1087 } else {
1088 entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
1089 if (entry_ex->entry.pw_end == NULL) {
1090 ret = ENOMEM;
1091 goto out;
1092 }
1093 *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
1094 }
1095
1096 acct_expiry = samdb_result_account_expires(msg);
1097 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
1098 entry_ex->entry.valid_end = NULL;
1099 } else {
1100 entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
1101 if (entry_ex->entry.valid_end == NULL) {
1102 ret = ENOMEM;
1103 goto out;
1104 }
1105 *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
1106 }
1107 }
1108
1109 entry_ex->entry.valid_start = NULL;
1110
1111 entry_ex->entry.max_life = malloc(sizeof(*entry_ex->entry.max_life));
1112 if (entry_ex->entry.max_life == NULL) {
1113 ret = ENOMEM;
1114 goto out;
1115 }
1116
1117 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
1118 *entry_ex->entry.max_life = kdc_db_ctx->policy.svc_tkt_lifetime;
1119 } else if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT || ent_type == SAMBA_KDC_ENT_TYPE_CLIENT) {
1120 *entry_ex->entry.max_life = kdc_db_ctx->policy.usr_tkt_lifetime;
1121 } else {
1122 *entry_ex->entry.max_life = MIN(kdc_db_ctx->policy.svc_tkt_lifetime,
1123 kdc_db_ctx->policy.usr_tkt_lifetime);
1124 }
1125
1126 entry_ex->entry.max_renew = malloc(sizeof(*entry_ex->entry.max_life));
1127 if (entry_ex->entry.max_renew == NULL) {
1128 ret = ENOMEM;
1129 goto out;
1130 }
1131
1132 *entry_ex->entry.max_renew = kdc_db_ctx->policy.renewal_lifetime;
1133
1134 /* Get keys from the db */
1135 ret = samba_kdc_message2entry_keys(context, kdc_db_ctx, p, msg,
1136 rid, is_rodc, userAccountControl,
1137 ent_type, entry_ex);
1138 if (ret) {
1139 /* Could be bogus data in the entry, or out of memory */
1140 goto out;
1141 }
1142
1143 p->msg = talloc_steal(p, msg);
1144
1145 out:
1146 if (ret != 0) {
1147 /* This doesn't free ent itself, that is for the eventual caller to do */
1148 sdb_free_entry(entry_ex);
1149 ZERO_STRUCTP(entry_ex);
1150 } else {
1151 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1152 }
1153
1154 return ret;
1155 }
1156
1157 /*
1158 * Construct an hdb_entry from a directory entry.
1159 * The kvno is what the remote client asked for
1160 */
1161 static krb5_error_code samba_kdc_trust_message2entry(krb5_context context,
1162 struct samba_kdc_db_context *kdc_db_ctx,
1163 TALLOC_CTX *mem_ctx, krb5_const_principal principal,
1164 enum trust_direction direction,
1165 struct ldb_dn *realm_dn,
1166 unsigned flags,
1167 uint32_t kvno,
1168 struct ldb_message *msg,
1169 struct sdb_entry_ex *entry_ex)
1170 {
1171 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1172 const char *our_realm = lpcfg_realm(lp_ctx);
1173 char *partner_realm = NULL;
1174 const char *realm = NULL;
1175 const char *krbtgt_realm = NULL;
1176 DATA_BLOB password_utf16 = data_blob_null;
1177 DATA_BLOB password_utf8 = data_blob_null;
1178 struct samr_Password _password_hash;
1179 const struct samr_Password *password_hash = NULL;
1180 const struct ldb_val *password_val;
1181 struct trustAuthInOutBlob password_blob;
1182 struct samba_kdc_entry *p;
1183 bool use_previous = false;
1184 uint32_t current_kvno;
1185 uint32_t previous_kvno;
1186 uint32_t num_keys = 0;
1187 enum ndr_err_code ndr_err;
1188 int ret;
1189 unsigned int i;
1190 struct AuthenticationInformationArray *auth_array;
1191 struct timeval tv;
1192 NTTIME an_hour_ago;
1193 uint32_t *auth_kvno;
1194 bool preferr_current = false;
1195 uint32_t supported_enctypes = ENC_RC4_HMAC_MD5;
1196 struct lsa_TrustDomainInfoInfoEx *tdo = NULL;
1197 NTSTATUS status;
1198
1199 if (dsdb_functional_level(kdc_db_ctx->samdb) >= DS_DOMAIN_FUNCTION_2008) {
1200 supported_enctypes = ldb_msg_find_attr_as_uint(msg,
1201 "msDS-SupportedEncryptionTypes",
1202 supported_enctypes);
1203 }
1204
1205 status = dsdb_trust_parse_tdo_info(mem_ctx, msg, &tdo);
1206 if (!NT_STATUS_IS_OK(status)) {
1207 krb5_clear_error_message(context);
1208 ret = ENOMEM;
1209 goto out;
1210 }
1211
1212 if (!(tdo->trust_direction & direction)) {
1213 krb5_clear_error_message(context);
1214 ret = SDB_ERR_NOENTRY;
1215 goto out;
1216 }
1217
1218 if (tdo->trust_type != LSA_TRUST_TYPE_UPLEVEL) {
1219 /*
1220 * Only UPLEVEL domains support kerberos here,
1221 * as we don't support LSA_TRUST_TYPE_MIT.
1222 */
1223 krb5_clear_error_message(context);
1224 ret = SDB_ERR_NOENTRY;
1225 goto out;
1226 }
1227
1228 if (tdo->domain_name.string == NULL) {
1229 krb5_clear_error_message(context);
1230 ret = SDB_ERR_NOENTRY;
1231 goto out;
1232 }
1233 partner_realm = strupper_talloc(mem_ctx, tdo->domain_name.string);
1234 if (partner_realm == NULL) {
1235 krb5_clear_error_message(context);
1236 ret = ENOMEM;
1237 goto out;
1238 }
1239
1240 if (direction == INBOUND) {
1241 realm = our_realm;
1242 krbtgt_realm = partner_realm;
1243
1244 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
1245 } else { /* OUTBOUND */
1246 realm = partner_realm;
1247 krbtgt_realm = our_realm;
1248
1249 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
1250 }
1251
1252 if (password_val == NULL) {
1253 krb5_clear_error_message(context);
1254 ret = SDB_ERR_NOENTRY;
1255 goto out;
1256 }
1257
1258 ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, &password_blob,
1259 (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
1260 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1261 krb5_clear_error_message(context);
1262 ret = EINVAL;
1263 goto out;
1264 }
1265
1266 p = talloc(mem_ctx, struct samba_kdc_entry);
1267 if (!p) {
1268 ret = ENOMEM;
1269 goto out;
1270 }
1271
1272 p->kdc_db_ctx = kdc_db_ctx;
1273 p->realm_dn = realm_dn;
1274
1275 talloc_set_destructor(p, samba_kdc_entry_destructor);
1276
1277 /* make sure we do not have bogus data in there */
1278 memset(&entry_ex->entry, 0, sizeof(struct sdb_entry));
1279
1280 entry_ex->ctx = p;
1281
1282 /* use 'whenCreated' */
1283 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
1284 /* use 'kadmin' for now (needed by mit_samba) */
1285 ret = smb_krb5_make_principal(context,
1286 &entry_ex->entry.created_by.principal,
1287 realm, "kadmin", NULL);
1288 if (ret) {
1289 krb5_clear_error_message(context);
1290 goto out;
1291 }
1292
1293 /*
1294 * We always need to generate the canonicalized principal
1295 * with the values of our database.
1296 */
1297 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, realm,
1298 "krbtgt", krbtgt_realm, NULL);
1299 if (ret) {
1300 krb5_clear_error_message(context);
1301 goto out;
1302 }
1303 smb_krb5_principal_set_type(context, entry_ex->entry.principal,
1304 KRB5_NT_SRV_INST);
1305
1306 entry_ex->entry.valid_start = NULL;
1307
1308 /* we need to work out if we are going to use the current or
1309 * the previous password hash.
1310 * We base this on the kvno the client passes in. If the kvno
1311 * passed in is equal to the current kvno in our database then
1312 * we use the current structure. If it is the current kvno-1,
1313 * then we use the previous substrucure.
1314 */
1315
1316 /*
1317 * Windows preferrs the previous key for one hour.
1318 */
1319 tv = timeval_current();
1320 if (tv.tv_sec > 3600) {
1321 tv.tv_sec -= 3600;
1322 }
1323 an_hour_ago = timeval_to_nttime(&tv);
1324
1325 /* first work out the current kvno */
1326 current_kvno = 0;
1327 for (i=0; i < password_blob.count; i++) {
1328 struct AuthenticationInformation *a =
1329 &password_blob.current.array[i];
1330
1331 if (a->LastUpdateTime <= an_hour_ago) {
1332 preferr_current = true;
1333 }
1334
1335 if (a->AuthType == TRUST_AUTH_TYPE_VERSION) {
1336 current_kvno = a->AuthInfo.version.version;
1337 }
1338 }
1339 if (current_kvno == 0) {
1340 previous_kvno = 255;
1341 } else {
1342 previous_kvno = current_kvno - 1;
1343 }
1344 for (i=0; i < password_blob.count; i++) {
1345 struct AuthenticationInformation *a =
1346 &password_blob.previous.array[i];
1347
1348 if (a->AuthType == TRUST_AUTH_TYPE_VERSION) {
1349 previous_kvno = a->AuthInfo.version.version;
1350 }
1351 }
1352
1353 /* work out whether we will use the previous or current
1354 password */
1355 if (password_blob.previous.count == 0) {
1356 /* there is no previous password */
1357 use_previous = false;
1358 } else if (!(flags & SDB_F_KVNO_SPECIFIED)) {
1359 /*
1360 * If not specified we use the lowest kvno
1361 * for the first hour after an update.
1362 */
1363 if (preferr_current) {
1364 use_previous = false;
1365 } else if (previous_kvno < current_kvno) {
1366 use_previous = true;
1367 } else {
1368 use_previous = false;
1369 }
1370 } else if (kvno == current_kvno) {
1371 /*
1372 * Exact match ...
1373 */
1374 use_previous = false;
1375 } else if (kvno == previous_kvno) {
1376 /*
1377 * Exact match ...
1378 */
1379 use_previous = true;
1380 } else {
1381 /*
1382 * Fallback to the current one for anything else
1383 */
1384 use_previous = false;
1385 }
1386
1387 if (use_previous) {
1388 auth_array = &password_blob.previous;
1389 auth_kvno = &previous_kvno;
1390 } else {
1391 auth_array = &password_blob.current;
1392 auth_kvno = &current_kvno;
1393 }
1394
1395 /* use the kvno the client specified, if available */
1396 if (flags & SDB_F_KVNO_SPECIFIED) {
1397 entry_ex->entry.kvno = kvno;
1398 } else {
1399 entry_ex->entry.kvno = *auth_kvno;
1400 }
1401
1402 for (i=0; i < auth_array->count; i++) {
1403 if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
1404 bool ok;
1405
1406 password_utf16 = data_blob_const(auth_array->array[i].AuthInfo.clear.password,
1407 auth_array->array[i].AuthInfo.clear.size);
1408 if (password_utf16.length == 0) {
1409 break;
1410 }
1411
1412 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1413 mdfour(_password_hash.hash, password_utf16.data, password_utf16.length);
1414 if (password_hash == NULL) {
1415 num_keys += 1;
1416 }
1417 password_hash = &_password_hash;
1418 }
1419
1420 if (!(supported_enctypes & (ENC_HMAC_SHA1_96_AES128|ENC_HMAC_SHA1_96_AES256))) {
1421 break;
1422 }
1423
1424 ok = convert_string_talloc(mem_ctx,
1425 CH_UTF16MUNGED, CH_UTF8,
1426 password_utf16.data,
1427 password_utf16.length,
1428 (void *)&password_utf8.data,
1429 &password_utf8.length);
1430 if (!ok) {
1431 krb5_clear_error_message(context);
1432 ret = ENOMEM;
1433 goto out;
1434 }
1435
1436 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1437 num_keys += 1;
1438 }
1439 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1440 num_keys += 1;
1441 }
1442 break;
1443 } else if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
1444 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1445 password_hash = &auth_array->array[i].AuthInfo.nt4owf.password;
1446 num_keys += 1;
1447 }
1448 }
1449 }
1450
1451 /* Must have found a cleartext or MD4 password */
1452 if (num_keys == 0) {
1453 DEBUG(1,(__location__ ": no usable key found\n"));
1454 krb5_clear_error_message(context);
1455 ret = SDB_ERR_NOENTRY;
1456 goto out;
1457 }
1458
1459 entry_ex->entry.keys.val = calloc(num_keys, sizeof(struct sdb_key));
1460 if (entry_ex->entry.keys.val == NULL) {
1461 krb5_clear_error_message(context);
1462 ret = ENOMEM;
1463 goto out;
1464 }
1465
1466 if (password_utf8.length != 0) {
1467 struct sdb_key key = {};
1468 krb5_const_principal salt_principal = entry_ex->entry.principal;
1469 krb5_data salt;
1470 krb5_data cleartext_data;
1471
1472 cleartext_data.data = discard_const_p(char, password_utf8.data);
1473 cleartext_data.length = password_utf8.length;
1474
1475 ret = smb_krb5_get_pw_salt(context,
1476 salt_principal,
1477 &salt);
1478 if (ret != 0) {
1479 goto out;
1480 }
1481
1482 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1483 ret = smb_krb5_create_key_from_string(context,
1484 salt_principal,
1485 &salt,
1486 &cleartext_data,
1487 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
1488 &key.key);
1489 if (ret != 0) {
1490 smb_krb5_free_data_contents(context, &salt);
1491 goto out;
1492 }
1493
1494 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1495 entry_ex->entry.keys.len++;
1496 }
1497
1498 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1499 ret = smb_krb5_create_key_from_string(context,
1500 salt_principal,
1501 &salt,
1502 &cleartext_data,
1503 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
1504 &key.key);
1505 if (ret != 0) {
1506 smb_krb5_free_data_contents(context, &salt);
1507 goto out;
1508 }
1509
1510 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1511 entry_ex->entry.keys.len++;
1512 }
1513
1514 smb_krb5_free_data_contents(context, &salt);
1515 }
1516
1517 if (password_hash != NULL) {
1518 struct sdb_key key = {};
1519
1520 ret = smb_krb5_keyblock_init_contents(context,
1521 ENCTYPE_ARCFOUR_HMAC,
1522 password_hash->hash,
1523 sizeof(password_hash->hash),
1524 &key.key);
1525 if (ret != 0) {
1526 goto out;
1527 }
1528
1529 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1530 entry_ex->entry.keys.len++;
1531 }
1532
1533 entry_ex->entry.flags = int2SDBFlags(0);
1534 entry_ex->entry.flags.immutable = 1;
1535 entry_ex->entry.flags.invalid = 0;
1536 entry_ex->entry.flags.server = 1;
1537 entry_ex->entry.flags.require_preauth = 1;
1538
1539 entry_ex->entry.pw_end = NULL;
1540
1541 entry_ex->entry.max_life = NULL;
1542
1543 entry_ex->entry.max_renew = NULL;
1544
1545 ret = samba_kdc_sort_encryption_keys(entry_ex);
1546 if (ret != 0) {
1547 krb5_clear_error_message(context);
1548 ret = ENOMEM;
1549 goto out;
1550 }
1551
1552 p->msg = talloc_steal(p, msg);
1553
1554 out:
1555 TALLOC_FREE(partner_realm);
1556
1557 if (ret != 0) {
1558 /* This doesn't free ent itself, that is for the eventual caller to do */
1559 sdb_free_entry(entry_ex);
1560 } else {
1561 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1562 }
1563
1564 return ret;
1565
1566 }
1567
1568 static krb5_error_code samba_kdc_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
1569 TALLOC_CTX *mem_ctx,
1570 const char *realm,
1571 struct ldb_dn *realm_dn,
1572 struct ldb_message **pmsg)
1573 {
1574 NTSTATUS status;
1575 const char * const *attrs = trust_attrs;
1576
1577 status = dsdb_trust_search_tdo(ldb_ctx, realm, realm,
1578 attrs, mem_ctx, pmsg);
1579 if (NT_STATUS_IS_OK(status)) {
1580 return 0;
1581 } else if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1582 return SDB_ERR_NOENTRY;
1583 } else if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1584 int ret = ENOMEM;
1585 krb5_set_error_message(context, ret, "get_sam_result_trust: out of memory");
1586 return ret;
1587 } else {
1588 int ret = EINVAL;
1589 krb5_set_error_message(context, ret, "get_sam_result_trust: %s", nt_errstr(status));
1590 return ret;
1591 }
1592 }
1593
1594 static krb5_error_code samba_kdc_lookup_client(krb5_context context,
1595 struct samba_kdc_db_context *kdc_db_ctx,
1596 TALLOC_CTX *mem_ctx,
1597 krb5_const_principal principal,
1598 const char **attrs,
1599 struct ldb_dn **realm_dn,
1600 struct ldb_message **msg)
1601 {
1602 NTSTATUS nt_status;
1603 char *principal_string = NULL;
1604
1605 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1606 principal_string = smb_krb5_principal_get_comp_string(mem_ctx, context,
1607 principal, 0);
1608 if (principal_string == NULL) {
1609 return ENOMEM;
1610 }
1611 } else {
1612 char *principal_string_m = NULL;
1613 krb5_error_code ret;
1614
1615 ret = krb5_unparse_name(context, principal, &principal_string_m);
1616 if (ret != 0) {
1617 return ret;
1618 }
1619
1620 principal_string = talloc_strdup(mem_ctx, principal_string_m);
1621 SAFE_FREE(principal_string_m);
1622 if (principal_string == NULL) {
1623 return ENOMEM;
1624 }
1625 }
1626
1627 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1628 mem_ctx, principal_string, attrs,
1629 realm_dn, msg);
1630 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1631 krb5_principal fallback_principal = NULL;
1632 unsigned int num_comp;
1633 char *fallback_realm = NULL;
1634 char *fallback_account = NULL;
1635 krb5_error_code ret;
1636
1637 ret = krb5_parse_name(context, principal_string,
1638 &fallback_principal);
1639 TALLOC_FREE(principal_string);
1640 if (ret != 0) {
1641 return ret;
1642 }
1643
1644 num_comp = krb5_princ_size(context, fallback_principal);
1645 fallback_realm = smb_krb5_principal_get_realm(context,
1646 fallback_principal);
1647 if (fallback_realm == NULL) {
1648 krb5_free_principal(context, fallback_principal);
1649 return ENOMEM;
1650 }
1651
1652 if (num_comp == 1) {
1653 size_t len;
1654
1655 fallback_account = smb_krb5_principal_get_comp_string(mem_ctx,
1656 context, fallback_principal, 0);
1657 if (fallback_account == NULL) {
1658 krb5_free_principal(context, fallback_principal);
1659 SAFE_FREE(fallback_realm);
1660 return ENOMEM;
1661 }
1662
1663 len = strlen(fallback_account);
1664 if (len >= 2 && fallback_account[len - 1] == '$') {
1665 TALLOC_FREE(fallback_account);
1666 }
1667 }
1668 krb5_free_principal(context, fallback_principal);
1669 fallback_principal = NULL;
1670
1671 if (fallback_account != NULL) {
1672 char *with_dollar;
1673
1674 with_dollar = talloc_asprintf(mem_ctx, "%s$",
1675 fallback_account);
1676 if (with_dollar == NULL) {
1677 SAFE_FREE(fallback_realm);
1678 return ENOMEM;
1679 }
1680 TALLOC_FREE(fallback_account);
1681
1682 ret = smb_krb5_make_principal(context,
1683 &fallback_principal,
1684 fallback_realm,
1685 with_dollar, NULL);
1686 TALLOC_FREE(with_dollar);
1687 if (ret != 0) {
1688 SAFE_FREE(fallback_realm);
1689 return ret;
1690 }
1691 }
1692 SAFE_FREE(fallback_realm);
1693
1694 if (fallback_principal != NULL) {
1695 char *fallback_string = NULL;
1696
1697 ret = krb5_unparse_name(context,
1698 fallback_principal,
1699 &fallback_string);
1700 if (ret != 0) {
1701 krb5_free_principal(context, fallback_principal);
1702 return ret;
1703 }
1704
1705 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1706 mem_ctx,
1707 fallback_string,
1708 attrs,
1709 realm_dn, msg);
1710 SAFE_FREE(fallback_string);
1711 }
1712 krb5_free_principal(context, fallback_principal);
1713 fallback_principal = NULL;
1714 }
1715 TALLOC_FREE(principal_string);
1716
1717 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1718 return SDB_ERR_NOENTRY;
1719 } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1720 return ENOMEM;
1721 } else if (!NT_STATUS_IS_OK(nt_status)) {
1722 return EINVAL;
1723 }
1724
1725 return 0;
1726 }
1727
1728 static krb5_error_code samba_kdc_fetch_client(krb5_context context,
1729 struct samba_kdc_db_context *kdc_db_ctx,
1730 TALLOC_CTX *mem_ctx,
1731 krb5_const_principal principal,
1732 unsigned flags,
1733 struct sdb_entry_ex *entry_ex) {
1734 struct ldb_dn *realm_dn;
1735 krb5_error_code ret;
1736 struct ldb_message *msg = NULL;
1737
1738 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1739 mem_ctx, principal, user_attrs,
1740 &realm_dn, &msg);
1741 if (ret != 0) {
1742 return ret;
1743 }
1744
1745 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1746 principal, SAMBA_KDC_ENT_TYPE_CLIENT,
1747 flags,
1748 realm_dn, msg, entry_ex);
1749 return ret;
1750 }
1751
1752 static krb5_error_code samba_kdc_fetch_krbtgt(krb5_context context,
1753 struct samba_kdc_db_context *kdc_db_ctx,
1754 TALLOC_CTX *mem_ctx,
1755 krb5_const_principal principal,
1756 unsigned flags,
1757 uint32_t kvno,
1758 struct sdb_entry_ex *entry_ex)
1759 {
1760 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1761 krb5_error_code ret;
1762 struct ldb_message *msg = NULL;
1763 struct ldb_dn *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1764 char *realm_from_princ, *realm_from_princ_malloc;
1765 char *realm_princ_comp = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 1);
1766
1767 realm_from_princ_malloc = smb_krb5_principal_get_realm(context, principal);
1768 if (realm_from_princ_malloc == NULL) {
1769 /* can't happen */
1770 return SDB_ERR_NOENTRY;
1771 }
1772 realm_from_princ = talloc_strdup(mem_ctx, realm_from_princ_malloc);
1773 free(realm_from_princ_malloc);
1774 if (realm_from_princ == NULL) {
1775 return SDB_ERR_NOENTRY;
1776 }
1777
1778 if (krb5_princ_size(context, principal) != 2
1779 || (principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME) != 0)) {
1780 /* Not a krbtgt */
1781 return SDB_ERR_NOENTRY;
1782 }
1783
1784 /* krbtgt case. Either us or a trusted realm */
1785
1786 if (lpcfg_is_my_domain_or_realm(lp_ctx, realm_from_princ)
1787 && lpcfg_is_my_domain_or_realm(lp_ctx, realm_princ_comp)) {
1788 /* us, or someone quite like us */
1789 /* Cludge, cludge cludge. If the realm part of krbtgt/realm,
1790 * is in our db, then direct the caller at our primary
1791 * krbtgt */
1792
1793 int lret;
1794 unsigned int krbtgt_number;
1795 /* w2k8r2 sometimes gives us a kvno of 255 for inter-domain
1796 trust tickets. We don't yet know what this means, but we do
1797 seem to need to treat it as unspecified */
1798 if (flags & SDB_F_KVNO_SPECIFIED) {
1799 krbtgt_number = SAMBA_KVNO_GET_KRBTGT(kvno);
1800 if (kdc_db_ctx->rodc) {
1801 if (krbtgt_number != kdc_db_ctx->my_krbtgt_number) {
1802 return SDB_ERR_NOT_FOUND_HERE;
1803 }
1804 }
1805 } else {
1806 krbtgt_number = kdc_db_ctx->my_krbtgt_number;
1807 }
1808
1809 if (krbtgt_number == kdc_db_ctx->my_krbtgt_number) {
1810 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1811 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
1812 krbtgt_attrs, DSDB_SEARCH_NO_GLOBAL_CATALOG,
1813 "(objectClass=user)");
1814 } else {
1815 /* We need to look up an RODC krbtgt (perhaps
1816 * ours, if we are an RODC, perhaps another
1817 * RODC if we are a read-write DC */
1818 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1819 &msg, realm_dn, LDB_SCOPE_SUBTREE,
1820 krbtgt_attrs,
1821 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1822 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=%u))", (unsigned)(krbtgt_number));
1823 }
1824
1825 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1826 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1827 (unsigned)(krbtgt_number));
1828 krb5_set_error_message(context, SDB_ERR_NOENTRY,
1829 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1830 (unsigned)(krbtgt_number));
1831 return SDB_ERR_NOENTRY;
1832 } else if (lret != LDB_SUCCESS) {
1833 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1834 (unsigned)(krbtgt_number));
1835 krb5_set_error_message(context, SDB_ERR_NOENTRY,
1836 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1837 (unsigned)(krbtgt_number));
1838 return SDB_ERR_NOENTRY;
1839 }
1840
1841 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1842 principal, SAMBA_KDC_ENT_TYPE_KRBTGT,
1843 flags, realm_dn, msg, entry_ex);
1844 if (ret != 0) {
1845 krb5_warnx(context, "samba_kdc_fetch: self krbtgt message2entry failed");
1846 }
1847 return ret;
1848
1849 } else {
1850 enum trust_direction direction = UNKNOWN;
1851 const char *realm = NULL;
1852
1853 /* Either an inbound or outbound trust */
1854
1855 if (strcasecmp(lpcfg_realm(lp_ctx), realm_from_princ) == 0) {
1856 /* look for inbound trust */
1857 direction = INBOUND;
1858 realm = realm_princ_comp;
1859 } else if (principal_comp_strcasecmp(context, principal, 1, lpcfg_realm(lp_ctx)) == 0) {
1860 /* look for outbound trust */
1861 direction = OUTBOUND;
1862 realm = realm_from_princ;
1863 } else {
1864 krb5_warnx(context, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1865 realm_from_princ,
1866 realm_princ_comp);
1867 krb5_set_error_message(context, SDB_ERR_NOENTRY, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1868 realm_from_princ,
1869 realm_princ_comp);
1870 return SDB_ERR_NOENTRY;
1871 }
1872
1873 /* Trusted domains are under CN=system */
1874
1875 ret = samba_kdc_lookup_trust(context, kdc_db_ctx->samdb,
1876 mem_ctx,
1877 realm, realm_dn, &msg);
1878
1879 if (ret != 0) {
1880 krb5_warnx(context, "samba_kdc_fetch: could not find principal in DB");
1881 krb5_set_error_message(context, ret, "samba_kdc_fetch: could not find principal in DB");
1882 return ret;
1883 }
1884
1885 ret = samba_kdc_trust_message2entry(context, kdc_db_ctx, mem_ctx,
1886 principal, direction,
1887 realm_dn, flags, kvno, msg, entry_ex);
1888 if (ret != 0) {
1889 krb5_warnx(context, "samba_kdc_fetch: trust_message2entry failed for %s",
1890 ldb_dn_get_linearized(msg->dn));
1891 krb5_set_error_message(context, ret, "samba_kdc_fetch: "
1892 "trust_message2entry failed for %s",
1893 ldb_dn_get_linearized(msg->dn));
1894 }
1895 return ret;
1896 }
1897
1898 }
1899
1900 static krb5_error_code samba_kdc_lookup_server(krb5_context context,
1901 struct samba_kdc_db_context *kdc_db_ctx,
1902 TALLOC_CTX *mem_ctx,
1903 krb5_const_principal principal,
1904 unsigned flags,
1905 const char **attrs,
1906 struct ldb_dn **realm_dn,
1907 struct ldb_message **msg)
1908 {
1909 krb5_error_code ret;
1910 if ((smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL)
1911 && krb5_princ_size(context, principal) >= 2) {
1912 /* 'normal server' case */
1913 int ldb_ret;
1914 NTSTATUS nt_status;
1915 struct ldb_dn *user_dn;
1916 char *principal_string;
1917
1918 ret = krb5_unparse_name_flags(context, principal,
1919 KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1920 &principal_string);
1921 if (ret != 0) {
1922 return ret;
1923 }
1924
1925 /* At this point we may find the host is known to be
1926 * in a different realm, so we should generate a
1927 * referral instead */
1928 nt_status = crack_service_principal_name(kdc_db_ctx->samdb,
1929 mem_ctx, principal_string,
1930 &user_dn, realm_dn);
1931 free(principal_string);
1932
1933 if (!NT_STATUS_IS_OK(nt_status)) {
1934 return SDB_ERR_NOENTRY;
1935 }
1936
1937 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb,
1938 mem_ctx,
1939 msg, user_dn, LDB_SCOPE_BASE,
1940 attrs,
1941 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1942 "(objectClass=*)");
1943 if (ldb_ret != LDB_SUCCESS) {
1944 return SDB_ERR_NOENTRY;
1945 }
1946 return 0;
1947 } else if (!(flags & SDB_F_FOR_AS_REQ)
1948 && smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1949 /*
1950 * The behaviour of accepting an
1951 * KRB5_NT_ENTERPRISE_PRINCIPAL server principal
1952 * containing a UPN only applies to TGS-REQ packets,
1953 * not AS-REQ packets.
1954 */
1955 return samba_kdc_lookup_client(context, kdc_db_ctx,
1956 mem_ctx, principal, attrs,
1957 realm_dn, msg);
1958 } else {
1959 /*
1960 * This case is for:
1961 * - the AS-REQ, where we only accept
1962 * samAccountName based lookups for the server, no
1963 * matter if the name is an
1964 * KRB5_NT_ENTERPRISE_PRINCIPAL or not
1965 * - for the TGS-REQ when we are not given an
1966 * KRB5_NT_ENTERPRISE_PRINCIPAL, which also must
1967 * only lookup samAccountName based names.
1968 */
1969 int lret;
1970 char *short_princ;
1971 krb5_principal enterprise_principal = NULL;
1972 krb5_const_principal used_principal = NULL;
1973 char *name1 = NULL;
1974 size_t len1 = 0;
1975 char *filter = NULL;
1976
1977 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1978 char *str = NULL;
1979 /* Need to reparse the enterprise principal to find the real target */
1980 if (krb5_princ_size(context, principal) != 1) {
1981 ret = KRB5_PARSE_MALFORMED;
1982 krb5_set_error_message(context, ret, "samba_kdc_lookup_server: request for an "
1983 "enterprise principal with wrong (%d) number of components",
1984 krb5_princ_size(context, principal));
1985 return ret;
1986 }
1987 str = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 0);
1988 if (str == NULL) {
1989 return KRB5_PARSE_MALFORMED;
1990 }
1991 ret = krb5_parse_name(context, str,
1992 &enterprise_principal);
1993 talloc_free(str);
1994 if (ret) {
1995 return ret;
1996 }
1997 used_principal = enterprise_principal;
1998 } else {
1999 used_principal = principal;
2000 }
2001
2002 /* server as client principal case, but we must not lookup userPrincipalNames */
2003 *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
2004
2005 /* TODO: Check if it is our realm, otherwise give referral */
2006
2007 ret = krb5_unparse_name_flags(context, used_principal,
2008 KRB5_PRINCIPAL_UNPARSE_NO_REALM |
2009 KRB5_PRINCIPAL_UNPARSE_DISPLAY,
2010 &short_princ);
2011 used_principal = NULL;
2012 krb5_free_principal(context, enterprise_principal);
2013 enterprise_principal = NULL;
2014
2015 if (ret != 0) {
2016 krb5_set_error_message(context, ret, "samba_kdc_lookup_principal: could not parse principal");
2017 krb5_warnx(context, "samba_kdc_lookup_principal: could not parse principal");
2018 return ret;
2019 }
2020
2021 name1 = ldb_binary_encode_string(mem_ctx, short_princ);
2022 SAFE_FREE(short_princ);
2023 if (name1 == NULL) {
2024 return ENOMEM;
2025 }
2026 len1 = strlen(name1);
2027 if (len1 >= 1 && name1[len1 - 1] != '$') {
2028 filter = talloc_asprintf(mem_ctx,
2029 "(&(objectClass=user)(|(samAccountName=%s)(samAccountName=%s$)))",
2030 name1, name1);
2031 if (filter == NULL) {
2032 return ENOMEM;
2033 }
2034 } else {
2035 filter = talloc_asprintf(mem_ctx,
2036 "(&(objectClass=user)(samAccountName=%s))",
2037 name1);
2038 if (filter == NULL) {
2039 return ENOMEM;
2040 }
2041 }
2042
2043 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx, msg,
2044 *realm_dn, LDB_SCOPE_SUBTREE,
2045 attrs,
2046 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
2047 "%s", filter);
2048 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
2049 DEBUG(10, ("Failed to find an entry for %s filter:%s\n",
2050 name1, filter));
2051 return SDB_ERR_NOENTRY;
2052 }
2053 if (lret == LDB_ERR_CONSTRAINT_VIOLATION) {
2054 DEBUG(10, ("Failed to find unique entry for %s filter:%s\n",
2055 name1, filter));
2056 return SDB_ERR_NOENTRY;
2057 }
2058 if (lret != LDB_SUCCESS) {
2059 DEBUG(0, ("Failed single search for %s - %s\n",
2060 name1, ldb_errstring(kdc_db_ctx->samdb)));
2061 return SDB_ERR_NOENTRY;
2062 }
2063 return 0;
2064 }
2065 return SDB_ERR_NOENTRY;
2066 }
2067
2068
2069
2070 static krb5_error_code samba_kdc_fetch_server(krb5_context context,
2071 struct samba_kdc_db_context *kdc_db_ctx,
2072 TALLOC_CTX *mem_ctx,
2073 krb5_const_principal principal,
2074 unsigned flags,
2075 struct sdb_entry_ex *entry_ex)
2076 {
2077 krb5_error_code ret;
2078 struct ldb_dn *realm_dn;
2079 struct ldb_message *msg;
2080
2081 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, principal,
2082 flags, server_attrs, &realm_dn, &msg);
2083 if (ret != 0) {
2084 return ret;
2085 }
2086
2087 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
2088 principal, SAMBA_KDC_ENT_TYPE_SERVER,
2089 flags,
2090 realm_dn, msg, entry_ex);
2091 if (ret != 0) {
2092 krb5_warnx(context, "samba_kdc_fetch: message2entry failed");
2093 }
2094
2095 return ret;
2096 }
2097
2098 static krb5_error_code samba_kdc_lookup_realm(krb5_context context,
2099 struct samba_kdc_db_context *kdc_db_ctx,
2100 TALLOC_CTX *mem_ctx,
2101 krb5_const_principal principal,
2102 unsigned flags,
2103 struct sdb_entry_ex *entry_ex)
2104 {
2105 TALLOC_CTX *frame = talloc_stackframe();
2106 NTSTATUS status;
2107 krb5_error_code ret;
2108 char *_realm = NULL;
2109 bool check_realm = false;
2110 const char *realm = NULL;
2111 struct dsdb_trust_routing_table *trt = NULL;
2112 const struct lsa_TrustDomainInfoInfoEx *tdo = NULL;
2113 unsigned int num_comp;
2114 bool ok;
2115 char *upper = NULL;
2116
2117 num_comp = krb5_princ_size(context, principal);
2118
2119 if (flags & SDB_F_GET_CLIENT) {
2120 if (flags & SDB_F_FOR_AS_REQ) {
2121 check_realm = true;
2122 }
2123 }
2124 if (flags & SDB_F_GET_SERVER) {
2125 if (flags & SDB_F_FOR_TGS_REQ) {
2126 check_realm = true;
2127 }
2128 }
2129
2130 if (!check_realm) {
2131 TALLOC_FREE(frame);
2132 return 0;
2133 }
2134
2135 _realm = smb_krb5_principal_get_realm(context, principal);
2136 if (_realm == NULL) {
2137 TALLOC_FREE(frame);
2138 return ENOMEM;
2139 }
2140
2141 /*
2142 * The requested realm needs to be our own
2143 */
2144 ok = lpcfg_is_my_domain_or_realm(kdc_db_ctx->lp_ctx, _realm);
2145 if (!ok) {
2146 /*
2147 * The request is not for us...
2148 */
2149 SAFE_FREE(_realm);
2150 TALLOC_FREE(frame);
2151 return SDB_ERR_NOENTRY;
2152 }
2153
2154 realm = talloc_strdup(frame, _realm);
2155 SAFE_FREE(_realm);
2156 if (realm == NULL) {
2157 TALLOC_FREE(frame);
2158 return ENOMEM;
2159 }
2160
2161 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
2162 char *principal_string = NULL;
2163 krb5_principal enterprise_principal = NULL;
2164 char *enterprise_realm = NULL;
2165
2166 if (num_comp != 1) {
2167 TALLOC_FREE(frame);
2168 return SDB_ERR_NOENTRY;
2169 }
2170
2171 principal_string = smb_krb5_principal_get_comp_string(frame, context,
2172 principal, 0);
2173 if (principal_string == NULL) {
2174 TALLOC_FREE(frame);
2175 return ENOMEM;
2176 }
2177
2178 ret = krb5_parse_name(context, principal_string,
2179 &enterprise_principal);
2180 TALLOC_FREE(principal_string);
2181 if (ret) {
2182 TALLOC_FREE(frame);
2183 return ret;
2184 }
2185
2186 enterprise_realm = smb_krb5_principal_get_realm(context,
2187 enterprise_principal);
2188 krb5_free_principal(context, enterprise_principal);
2189 if (enterprise_realm != NULL) {
2190 realm = talloc_strdup(frame, enterprise_realm);
2191 SAFE_FREE(enterprise_realm);
2192 if (realm == NULL) {
2193 TALLOC_FREE(frame);
2194 return ENOMEM;
2195 }
2196 }
2197 }
2198
2199 if (flags & SDB_F_GET_SERVER) {
2200 char *service_realm = NULL;
2201
2202 ret = principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME);
2203 if (ret == 0) {
2204 /*
2205 * we need to search krbtgt/ locally
2206 */
2207 TALLOC_FREE(frame);
2208 return 0;
2209 }
2210
2211 /*
2212 * We need to check the last component against the routing table.
2213 *
2214 * Note this works only with 2 or 3 component principals, e.g:
2215 *
2216 * servicePrincipalName: ldap/W2K8R2-219.bla.base
2217 * servicePrincipalName: ldap/W2K8R2-219.bla.base/bla.base
2218 * servicePrincipalName: ldap/W2K8R2-219.bla.base/ForestDnsZones.bla.base
2219 * servicePrincipalName: ldap/W2K8R2-219.bla.base/DomainDnsZones.bla.base
2220 */
2221
2222 if (num_comp == 2 || num_comp == 3) {
2223 service_realm = smb_krb5_principal_get_comp_string(frame,
2224 context,
2225 principal,
2226 num_comp - 1);
2227 }
2228
2229 if (service_realm != NULL) {
2230 realm = service_realm;
2231 }
2232 }
2233
2234 ok = lpcfg_is_my_domain_or_realm(kdc_db_ctx->lp_ctx, realm);
2235 if (ok) {
2236 /*
2237 * skip the expensive routing lookup
2238 */
2239 TALLOC_FREE(frame);
2240 return 0;
2241 }
2242
2243 status = dsdb_trust_routing_table_load(kdc_db_ctx->samdb,
2244 frame, &trt);
2245 if (!NT_STATUS_IS_OK(status)) {
2246 TALLOC_FREE(frame);
2247 return EINVAL;
2248 }
2249
2250 tdo = dsdb_trust_routing_by_name(trt, realm);
2251 if (tdo == NULL) {
2252 /*
2253 * This principal has to be local
2254 */
2255 TALLOC_FREE(frame);
2256 return 0;
2257 }
2258
2259 if (tdo->trust_attributes & LSA_TRUST_ATTRIBUTE_WITHIN_FOREST) {
2260 /*
2261 * TODO: handle the routing within the forest
2262 *
2263 * This should likely be handled in
2264 * samba_kdc_message2entry() in case we're
2265 * a global catalog. We'd need to check
2266 * if realm_dn is our own domain and derive
2267 * the dns domain name from realm_dn and check that
2268 * against the routing table or fallback to
2269 * the tdo we found here.
2270 *
2271 * But for now we don't support multiple domains
2272 * in our forest correctly anyway.
2273 *
2274 * Just search in our local database.
2275 */
2276 TALLOC_FREE(frame);
2277 return 0;
2278 }
2279
2280 ZERO_STRUCT(entry_ex->entry);
2281
2282 ret = krb5_copy_principal(context, principal,
2283 &entry_ex->entry.principal);
2284 if (ret) {
2285 TALLOC_FREE(frame);
2286 return ret;
2287 }
2288
2289 upper = strupper_talloc(frame, tdo->domain_name.string);
2290 if (upper == NULL) {
2291 TALLOC_FREE(frame);
2292 return ENOMEM;
2293 }
2294
2295 ret = smb_krb5_principal_set_realm(context,
2296 entry_ex->entry.principal,
2297 upper);
2298 if (ret) {
2299 TALLOC_FREE(frame);
2300 return ret;
2301 }
2302
2303 TALLOC_FREE(frame);
2304 return SDB_ERR_WRONG_REALM;
2305 }
2306
2307 krb5_error_code samba_kdc_fetch(krb5_context context,
2308 struct samba_kdc_db_context *kdc_db_ctx,
2309 krb5_const_principal principal,
2310 unsigned flags,
2311 krb5_kvno kvno,
2312 struct sdb_entry_ex *entry_ex)
2313 {
2314 krb5_error_code ret = SDB_ERR_NOENTRY;
2315 TALLOC_CTX *mem_ctx;
2316
2317 mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_fetch context");
2318 if (!mem_ctx) {
2319 ret = ENOMEM;
2320 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2321 return ret;
2322 }
2323
2324 ret = samba_kdc_lookup_realm(context, kdc_db_ctx, mem_ctx,
2325 principal, flags, entry_ex);
2326 if (ret != 0) {
2327 goto done;
2328 }
2329
2330 ret = SDB_ERR_NOENTRY;
2331
2332 if (flags & SDB_F_GET_CLIENT) {
2333 ret = samba_kdc_fetch_client(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
2334 if (ret != SDB_ERR_NOENTRY) goto done;
2335 }
2336 if (flags & SDB_F_GET_SERVER) {
2337 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
2338 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
2339 if (ret != SDB_ERR_NOENTRY) goto done;
2340
2341 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
2342 ret = samba_kdc_fetch_server(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
2343 if (ret != SDB_ERR_NOENTRY) goto done;
2344 }
2345 if (flags & SDB_F_GET_KRBTGT) {
2346 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
2347 if (ret != SDB_ERR_NOENTRY) goto done;
2348 }
2349
2350 done:
2351 talloc_free(mem_ctx);
2352 return ret;
2353 }
2354
2355 struct samba_kdc_seq {
2356 unsigned int index;
2357 unsigned int count;
2358 struct ldb_message **msgs;
2359 struct ldb_dn *realm_dn;
2360 };
2361
2362 static krb5_error_code samba_kdc_seq(krb5_context context,
2363 struct samba_kdc_db_context *kdc_db_ctx,
2364 struct sdb_entry_ex *entry)
2365 {
2366 krb5_error_code ret;
2367 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
2368 const char *realm = lpcfg_realm(kdc_db_ctx->lp_ctx);
2369 struct ldb_message *msg = NULL;
2370 const char *sAMAccountName = NULL;
2371 krb5_principal principal = NULL;
2372 TALLOC_CTX *mem_ctx;
2373
2374 if (!priv) {
2375 return SDB_ERR_NOENTRY;
2376 }
2377
2378 mem_ctx = talloc_named(priv, 0, "samba_kdc_seq context");
2379
2380 if (!mem_ctx) {
2381 ret = ENOMEM;
2382 krb5_set_error_message(context, ret, "samba_kdc_seq: talloc_named() failed!");
2383 return ret;
2384 }
2385
2386 while (priv->index < priv->count) {
2387 msg = priv->msgs[priv->index++];
2388
2389 sAMAccountName = ldb_msg_find_attr_as_string(msg, "sAMAccountName", NULL);
2390 if (sAMAccountName != NULL) {
2391 break;
2392 }
2393 }
2394
2395 if (sAMAccountName == NULL) {
2396 ret = SDB_ERR_NOENTRY;
2397 goto out;
2398 }
2399
2400 ret = smb_krb5_make_principal(context, &principal,
2401 realm, sAMAccountName, NULL);
2402 if (ret != 0) {
2403 goto out;
2404 }
2405
2406 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
2407 principal, SAMBA_KDC_ENT_TYPE_ANY,
2408 SDB_F_ADMIN_DATA|SDB_F_GET_ANY,
2409 priv->realm_dn, msg, entry);
2410
2411 out:
2412 if (principal != NULL) {
2413 krb5_free_principal(context, principal);
2414 }
2415
2416 if (ret != 0) {
2417 TALLOC_FREE(priv);
2418 kdc_db_ctx->seq_ctx = NULL;
2419 } else {
2420 talloc_free(mem_ctx);
2421 }
2422
2423 return ret;
2424 }
2425
2426 krb5_error_code samba_kdc_firstkey(krb5_context context,
2427 struct samba_kdc_db_context *kdc_db_ctx,
2428 struct sdb_entry_ex *entry)
2429 {
2430 struct ldb_context *ldb_ctx = kdc_db_ctx->samdb;
2431 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
2432 char *realm;
2433 struct ldb_result *res = NULL;
2434 krb5_error_code ret;
2435 TALLOC_CTX *mem_ctx;
2436 int lret;
2437
2438 if (priv) {
2439 TALLOC_FREE(priv);
2440 kdc_db_ctx->seq_ctx = NULL;
2441 }
2442
2443 priv = (struct samba_kdc_seq *) talloc(kdc_db_ctx, struct samba_kdc_seq);
2444 if (!priv) {
2445 ret = ENOMEM;
2446 krb5_set_error_message(context, ret, "talloc: out of memory");
2447 return ret;
2448 }
2449
2450 priv->index = 0;
2451 priv->msgs = NULL;
2452 priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
2453 priv->count = 0;
2454
2455 mem_ctx = talloc_named(priv, 0, "samba_kdc_firstkey context");
2456
2457 if (!mem_ctx) {
2458 ret = ENOMEM;
2459 krb5_set_error_message(context, ret, "samba_kdc_firstkey: talloc_named() failed!");
2460 return ret;
2461 }
2462
2463 ret = krb5_get_default_realm(context, &realm);
2464 if (ret != 0) {
2465 TALLOC_FREE(priv);
2466 return ret;
2467 }
2468 krb5_free_default_realm(context, realm);
2469
2470 lret = dsdb_search(ldb_ctx, priv, &res,
2471 priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
2472 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2473 "(objectClass=user)");
2474
2475 if (lret != LDB_SUCCESS) {
2476 TALLOC_FREE(priv);
2477 return SDB_ERR_NOENTRY;
2478 }
2479
2480 priv->count = res->count;
2481 priv->msgs = talloc_steal(priv, res->msgs);
2482 talloc_free(res);
2483
2484 kdc_db_ctx->seq_ctx = priv;
2485
2486 ret = samba_kdc_seq(context, kdc_db_ctx, entry);
2487
2488 if (ret != 0) {
2489 TALLOC_FREE(priv);
2490 kdc_db_ctx->seq_ctx = NULL;
2491 } else {
2492 talloc_free(mem_ctx);
2493 }
2494 return ret;
2495 }
2496
2497 krb5_error_code samba_kdc_nextkey(krb5_context context,
2498 struct samba_kdc_db_context *kdc_db_ctx,
2499 struct sdb_entry_ex *entry)
2500 {
2501 return samba_kdc_seq(context, kdc_db_ctx, entry);
2502 }
2503
2504 /* Check if a given entry may delegate or do s4u2self to this target principal
2505 *
2506 * This is currently a very nasty hack - allowing only delegation to itself.
2507 */
2508 krb5_error_code
2509 samba_kdc_check_s4u2self(krb5_context context,
2510 struct samba_kdc_db_context *kdc_db_ctx,
2511 struct samba_kdc_entry *skdc_entry,
2512 krb5_const_principal target_principal)
2513 {
2514 krb5_error_code ret;
2515 struct ldb_dn *realm_dn;
2516 struct ldb_message *msg;
2517 struct dom_sid *orig_sid;
2518 struct dom_sid *target_sid;
2519 const char *delegation_check_attrs[] = {
2520 "objectSid", NULL
2521 };
2522
2523 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2self");
2524
2525 if (!mem_ctx) {
2526 ret = ENOMEM;
2527 krb5_set_error_message(context, ret, "samba_kdc_check_s4u2self: talloc_named() failed!");
2528 return ret;
2529 }
2530
2531 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, target_principal,
2532 SDB_F_GET_CLIENT|SDB_F_GET_SERVER,
2533 delegation_check_attrs, &realm_dn, &msg);
2534
2535 if (ret != 0) {
2536 talloc_free(mem_ctx);
2537 return ret;
2538 }
2539
2540 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2541 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2542
2543 /* Allow delegation to the same principal, even if by a different
2544 * name. The easy and safe way to prove this is by SID
2545 * comparison */
2546 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2547 talloc_free(mem_ctx);
2548 return KRB5KDC_ERR_BADOPTION;
2549 }
2550
2551 talloc_free(mem_ctx);
2552 return ret;
2553 }
2554
2555 /* Certificates printed by a the Certificate Authority might have a
2556 * slightly different form of the user principal name to that in the
2557 * database. Allow a mismatch where they both refer to the same
2558 * SID */
2559
2560 krb5_error_code
2561 samba_kdc_check_pkinit_ms_upn_match(krb5_context context,
2562 struct samba_kdc_db_context *kdc_db_ctx,
2563 struct samba_kdc_entry *skdc_entry,
2564 krb5_const_principal certificate_principal)
2565 {
2566 krb5_error_code ret;
2567 struct ldb_dn *realm_dn;
2568 struct ldb_message *msg;
2569 struct dom_sid *orig_sid;
2570 struct dom_sid *target_sid;
2571 const char *ms_upn_check_attrs[] = {
2572 "objectSid", NULL
2573 };
2574
2575 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_pkinit_ms_upn_match");
2576
2577 if (!mem_ctx) {
2578 ret = ENOMEM;
2579 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2580 return ret;
2581 }
2582
2583 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
2584 mem_ctx, certificate_principal,
2585 ms_upn_check_attrs, &realm_dn, &msg);
2586
2587 if (ret != 0) {
2588 talloc_free(mem_ctx);
2589 return ret;
2590 }
2591
2592 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2593 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2594
2595 /* Consider these to be the same principal, even if by a different
2596 * name. The easy and safe way to prove this is by SID
2597 * comparison */
2598 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2599 talloc_free(mem_ctx);
2600 #ifdef KRB5_KDC_ERR_CLIENT_NAME_MISMATCH /* Heimdal */
2601 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
2602 #elif defined(KRB5KDC_ERR_CLIENT_NAME_MISMATCH) /* MIT */
2603 return KRB5KDC_ERR_CLIENT_NAME_MISMATCH;
2604 #endif
2605 }
2606
2607 talloc_free(mem_ctx);
2608 return ret;
2609 }
2610
2611 /*
2612 * Check if a given entry may delegate to this target principal
2613 * with S4U2Proxy.
2614 */
2615 krb5_error_code
2616 samba_kdc_check_s4u2proxy(krb5_context context,
2617 struct samba_kdc_db_context *kdc_db_ctx,
2618 struct samba_kdc_entry *skdc_entry,
2619 krb5_const_principal target_principal)
2620 {
2621 krb5_error_code ret;
2622 char *tmp = NULL;
2623 const char *client_dn = NULL;
2624 const char *target_principal_name = NULL;
2625 struct ldb_message_element *el;
2626 struct ldb_val val;
2627 unsigned int i;
2628 bool found = false;
2629
2630 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2proxy");
2631
2632 if (!mem_ctx) {
2633 ret = ENOMEM;
2634 krb5_set_error_message(context, ret,
2635 "samba_kdc_check_s4u2proxy:"
2636 " talloc_named() failed!");
2637 return ret;
2638 }
2639
2640 client_dn = ldb_dn_get_linearized(skdc_entry->msg->dn);
2641 if (!client_dn) {
2642 if (errno == 0) {
2643 errno = ENOMEM;
2644 }
2645 ret = errno;
2646 krb5_set_error_message(context, ret,
2647 "samba_kdc_check_s4u2proxy:"
2648 " ldb_dn_get_linearized() failed!");
2649 return ret;
2650 }
2651
2652 /*
2653 * The main heimdal code already checked that the target_principal
2654 * belongs to the same realm as the client.
2655 *
2656 * So we just need the principal without the realm,
2657 * as that is what is configured in the "msDS-AllowedToDelegateTo"
2658 * attribute.
2659 */
2660 ret = krb5_unparse_name_flags(context, target_principal,
2661 KRB5_PRINCIPAL_UNPARSE_NO_REALM, &tmp);
2662 if (ret) {
2663 talloc_free(mem_ctx);
2664 krb5_set_error_message(context, ret,
2665 "samba_kdc_check_s4u2proxy:"
2666 " krb5_unparse_name() failed!");
2667 return ret;
2668 }
2669 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] for target[%s]\n",
2670 client_dn, tmp));
2671
2672 target_principal_name = talloc_strdup(mem_ctx, tmp);
2673 SAFE_FREE(tmp);
2674 if (target_principal_name == NULL) {
2675 ret = ENOMEM;
2676 krb5_set_error_message(context, ret,
2677 "samba_kdc_check_s4u2proxy:"
2678 " talloc_strdup() failed!");
2679 return ret;
2680 }
2681
2682 el = ldb_msg_find_element(skdc_entry->msg, "msDS-AllowedToDelegateTo");
2683 if (el == NULL) {
2684 goto bad_option;
2685 }
2686
2687 val = data_blob_string_const(target_principal_name);
2688
2689 for (i=0; i<el->num_values; i++) {
2690 struct ldb_val *val1 = &val;
2691 struct ldb_val *val2 = &el->values[i];
2692 int cmp;
2693
2694 if (val1->length != val2->length) {
2695 continue;
2696 }
2697
2698 cmp = strncasecmp((const char *)val1->data,
2699 (const char *)val2->data,
2700 val1->length);
2701 if (cmp != 0) {
2702 continue;
2703 }
2704
2705 found = true;
2706 break;
2707 }
2708
2709 if (!found) {
2710 goto bad_option;
2711 }
2712
2713 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] allowed target[%s]\n",
2714 client_dn, tmp));
2715 talloc_free(mem_ctx);
2716 return 0;
2717
2718 bad_option:
2719 krb5_set_error_message(context, ret,
2720 "samba_kdc_check_s4u2proxy: client[%s] "
2721 "not allowed for delegation to target[%s]",
2722 client_dn,
2723 target_principal_name);
2724 talloc_free(mem_ctx);
2725 return KRB5KDC_ERR_BADOPTION;
2726 }
2727
2728 NTSTATUS samba_kdc_setup_db_ctx(TALLOC_CTX *mem_ctx, struct samba_kdc_base_context *base_ctx,
2729 struct samba_kdc_db_context **kdc_db_ctx_out)
2730 {
2731 int ldb_ret;
2732 struct ldb_message *msg;
2733 struct auth_session_info *session_info;
2734 struct samba_kdc_db_context *kdc_db_ctx;
2735 /* The idea here is very simple. Using Kerberos to
2736 * authenticate the KDC to the LDAP server is higly likely to
2737 * be circular.
2738 *
2739 * In future we may set this up to use EXERNAL and SSL
2740 * certificates, for now it will almost certainly be NTLMSSP_SET_USERNAME
2741 */
2742
2743 kdc_db_ctx = talloc_zero(mem_ctx, struct samba_kdc_db_context);
2744 if (kdc_db_ctx == NULL) {
2745 return NT_STATUS_NO_MEMORY;
2746 }
2747 kdc_db_ctx->ev_ctx = base_ctx->ev_ctx;
2748 kdc_db_ctx->lp_ctx = base_ctx->lp_ctx;
2749 kdc_db_ctx->msg_ctx = base_ctx->msg_ctx;
2750
2751 /* get default kdc policy */
2752 lpcfg_default_kdc_policy(mem_ctx,
2753 base_ctx->lp_ctx,
2754 &kdc_db_ctx->policy.svc_tkt_lifetime,
2755 &kdc_db_ctx->policy.usr_tkt_lifetime,
2756 &kdc_db_ctx->policy.renewal_lifetime);
2757
2758 session_info = system_session(kdc_db_ctx->lp_ctx);
2759 if (session_info == NULL) {
2760 return NT_STATUS_INTERNAL_ERROR;
2761 }
2762
2763 /* Setup the link to LDB */
2764 kdc_db_ctx->samdb = samdb_connect(kdc_db_ctx, base_ctx->ev_ctx,
2765 base_ctx->lp_ctx, session_info, 0);
2766 if (kdc_db_ctx->samdb == NULL) {
2767 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot open samdb for KDC backend!"));
2768 talloc_free(kdc_db_ctx);
2769 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2770 }
2771
2772 /* Find out our own krbtgt kvno */
2773 ldb_ret = samdb_rodc(kdc_db_ctx->samdb, &kdc_db_ctx->rodc);
2774 if (ldb_ret != LDB_SUCCESS) {
2775 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine if we are an RODC in KDC backend: %s\n",
2776 ldb_errstring(kdc_db_ctx->samdb)));
2777 talloc_free(kdc_db_ctx);
2778 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2779 }
2780 if (kdc_db_ctx->rodc) {
2781 int my_krbtgt_number;
2782 const char *secondary_keytab[] = { "msDS-SecondaryKrbTgtNumber", NULL };
2783 struct ldb_dn *account_dn;
2784 struct ldb_dn *server_dn = samdb_server_dn(kdc_db_ctx->samdb, kdc_db_ctx);
2785 if (!server_dn) {
2786 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server DN in KDC backend: %s\n",
2787 ldb_errstring(kdc_db_ctx->samdb)));
2788 talloc_free(kdc_db_ctx);
2789 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2790 }
2791
2792 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, server_dn,
2793 "serverReference", &account_dn);
2794 if (ldb_ret != LDB_SUCCESS) {
2795 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine server account in KDC backend: %s\n",
2796 ldb_errstring(kdc_db_ctx->samdb)));
2797 talloc_free(kdc_db_ctx);
2798 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2799 }
2800
2801 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, account_dn,
2802 "msDS-KrbTgtLink", &kdc_db_ctx->krbtgt_dn);
2803 talloc_free(account_dn);
2804 if (ldb_ret != LDB_SUCCESS) {
2805 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot determine RODC krbtgt account in KDC backend: %s\n",
2806 ldb_errstring(kdc_db_ctx->samdb)));
2807 talloc_free(kdc_db_ctx);
2808 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2809 }
2810
2811 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2812 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
2813 secondary_keytab,
2814 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2815 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=*))");
2816 if (ldb_ret != LDB_SUCCESS) {
2817 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read krbtgt account %s in KDC backend to get msDS-SecondaryKrbTgtNumber: %s: %s\n",
2818 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2819 ldb_errstring(kdc_db_ctx->samdb),
2820 ldb_strerror(ldb_ret)));
2821 talloc_free(kdc_db_ctx);
2822 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2823 }
2824 my_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
2825 if (my_krbtgt_number == -1) {
2826 DEBUG(1, ("samba_kdc_setup_db_ctx: Cannot read msDS-SecondaryKrbTgtNumber from krbtgt account %s in KDC backend: got %d\n",
2827 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
2828 my_krbtgt_number));
2829 talloc_free(kdc_db_ctx);
2830 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2831 }
2832 kdc_db_ctx->my_krbtgt_number = my_krbtgt_number;
2833
2834 } else {
2835 kdc_db_ctx->my_krbtgt_number = 0;
2836 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
2837 &msg,
2838 ldb_get_default_basedn(kdc_db_ctx->samdb),
2839 LDB_SCOPE_SUBTREE,
2840 krbtgt_attrs,
2841 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2842 "(&(objectClass=user)(samAccountName=krbtgt))");
2843
2844 if (ldb_ret != LDB_SUCCESS) {
2845 DEBUG(1, ("samba_kdc_fetch: could not find own KRBTGT in DB: %s\n", ldb_errstring(kdc_db_ctx->samdb)));
2846 talloc_free(kdc_db_ctx);
2847 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2848 }
2849 kdc_db_ctx->krbtgt_dn = talloc_steal(kdc_db_ctx, msg->dn);
2850 kdc_db_ctx->my_krbtgt_number = 0;
2851 talloc_free(msg);
2852 }
2853 *kdc_db_ctx_out = kdc_db_ctx;
2854 return NT_STATUS_OK;
2855 }
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