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script/autobuild.py: make code more pythonic
[Samba.git] / source4 / kdc / db-glue.c
blobf62a633c6c78ea82082410b28ace380d33664092
1 /*
2 Unix SMB/CIFS implementation.
3
4 Database Glue between Samba and the KDC
5
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2009
7 Copyright (C) Simo Sorce <idra@samba.org> 2010
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
22 */
23
24 #include "includes.h"
25 #include "libcli/security/security.h"
26 #include "auth/auth.h"
27 #include "auth/auth_sam.h"
28 #include "dsdb/samdb/samdb.h"
29 #include "dsdb/common/util.h"
30 #include "librpc/gen_ndr/ndr_drsblobs.h"
31 #include "param/param.h"
32 #include "../lib/crypto/md4.h"
33 #include "system/kerberos.h"
34 #include "auth/kerberos/kerberos.h"
35 #include "kdc/sdb.h"
36 #include "kdc/samba_kdc.h"
37 #include "kdc/db-glue.h"
38 #include "librpc/gen_ndr/ndr_irpc_c.h"
39 #include "lib/messaging/irpc.h"
40
41
42 #define SAMBA_KVNO_GET_KRBTGT(kvno) \
43 ((uint16_t)(((uint32_t)kvno) >> 16))
44
45 #define SAMBA_KVNO_AND_KRBTGT(kvno, krbtgt) \
46 ((krb5_kvno)((((uint32_t)kvno) & 0xFFFF) | \
47 ((((uint32_t)krbtgt) << 16) & 0xFFFF0000)))
48
49 enum samba_kdc_ent_type
50 { SAMBA_KDC_ENT_TYPE_CLIENT, SAMBA_KDC_ENT_TYPE_SERVER,
51 SAMBA_KDC_ENT_TYPE_KRBTGT, SAMBA_KDC_ENT_TYPE_TRUST, SAMBA_KDC_ENT_TYPE_ANY };
52
53 enum trust_direction {
54 UNKNOWN = 0,
55 INBOUND = LSA_TRUST_DIRECTION_INBOUND,
56 OUTBOUND = LSA_TRUST_DIRECTION_OUTBOUND
57 };
58
59 static const char *trust_attrs[] = {
60 "securityIdentifier",
61 "flatName",
62 "trustPartner",
63 "trustAttributes",
64 "trustDirection",
65 "trustType",
66 "msDS-TrustForestTrustInfo",
67 "trustAuthIncoming",
68 "trustAuthOutgoing",
69 "whenCreated",
70 "msDS-SupportedEncryptionTypes",
71 NULL
72 };
73
74 /*
75 send a message to the drepl server telling it to initiate a
76 REPL_SECRET getncchanges extended op to fetch the users secrets
77 */
78 static void auth_sam_trigger_repl_secret(TALLOC_CTX *mem_ctx,
79 struct imessaging_context *msg_ctx,
80 struct tevent_context *event_ctx,
81 struct ldb_dn *user_dn)
82 {
83 struct dcerpc_binding_handle *irpc_handle;
84 struct drepl_trigger_repl_secret r;
85 struct tevent_req *req;
86 TALLOC_CTX *tmp_ctx;
87
88 tmp_ctx = talloc_new(mem_ctx);
89 if (tmp_ctx == NULL) {
90 return;
91 }
92
93 irpc_handle = irpc_binding_handle_by_name(tmp_ctx, msg_ctx,
94 "dreplsrv",
95 &ndr_table_irpc);
96 if (irpc_handle == NULL) {
97 DEBUG(1,(__location__ ": Unable to get binding handle for dreplsrv\n"));
98 TALLOC_FREE(tmp_ctx);
99 return;
100 }
101
102 r.in.user_dn = ldb_dn_get_linearized(user_dn);
103
104 /*
105 * This seem to rely on the current IRPC implementation,
106 * which delivers the message in the _send function.
107 *
108 * TODO: we need a ONE_WAY IRPC handle and register
109 * a callback and wait for it to be triggered!
110 */
111 req = dcerpc_drepl_trigger_repl_secret_r_send(tmp_ctx,
112 event_ctx,
113 irpc_handle,
114 &r);
115
116 /* we aren't interested in a reply */
117 talloc_free(req);
118 TALLOC_FREE(tmp_ctx);
119 }
120
121 static time_t ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, time_t default_val)
122 {
123 const char *tmp;
124 const char *gentime;
125 struct tm tm;
126
127 gentime = ldb_msg_find_attr_as_string(msg, attr, NULL);
128 if (!gentime)
129 return default_val;
130
131 tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
132 if (tmp == NULL) {
133 return default_val;
134 }
135
136 return timegm(&tm);
137 }
138
139 static struct SDBFlags uf2SDBFlags(krb5_context context, uint32_t userAccountControl, enum samba_kdc_ent_type ent_type)
140 {
141 struct SDBFlags flags = int2SDBFlags(0);
142
143 /* we don't allow kadmin deletes */
144 flags.immutable = 1;
145
146 /* mark the principal as invalid to start with */
147 flags.invalid = 1;
148
149 flags.renewable = 1;
150
151 /* All accounts are servers, but this may be disabled again in the caller */
152 flags.server = 1;
153
154 /* Account types - clear the invalid bit if it turns out to be valid */
155 if (userAccountControl & UF_NORMAL_ACCOUNT) {
156 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
157 flags.client = 1;
158 }
159 flags.invalid = 0;
160 }
161
162 if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
163 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
164 flags.client = 1;
165 }
166 flags.invalid = 0;
167 }
168 if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
169 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
170 flags.client = 1;
171 }
172 flags.invalid = 0;
173 }
174 if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
175 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
176 flags.client = 1;
177 }
178 flags.invalid = 0;
179 }
180
181 /* Not permitted to act as a client if disabled */
182 if (userAccountControl & UF_ACCOUNTDISABLE) {
183 flags.client = 0;
184 }
185 if (userAccountControl & UF_LOCKOUT) {
186 flags.locked_out = 1;
187 }
188 /*
189 if (userAccountControl & UF_PASSWORD_NOTREQD) {
190 flags.invalid = 1;
191 }
192 */
193 /*
194 UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent
195 */
196 if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
197 flags.invalid = 1;
198 }
199
200 /* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in samba_kdc_message2entry() */
201
202 /*
203 if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
204 flags.invalid = 1;
205 }
206 */
207 if (userAccountControl & UF_SMARTCARD_REQUIRED) {
208 flags.require_hwauth = 1;
209 }
210 if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
211 flags.ok_as_delegate = 1;
212 }
213 if (userAccountControl & UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION) {
214 /*
215 * this is confusing...
216 *
217 * UF_TRUSTED_FOR_DELEGATION
218 * => ok_as_delegate
219 *
220 * and
221 *
222 * UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION
223 * => trusted_for_delegation
224 */
225 flags.trusted_for_delegation = 1;
226 }
227 if (!(userAccountControl & UF_NOT_DELEGATED)) {
228 flags.forwardable = 1;
229 flags.proxiable = 1;
230 }
231
232 if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
233 flags.require_preauth = 0;
234 } else {
235 flags.require_preauth = 1;
236
237 }
238 return flags;
239 }
240
241 static int samba_kdc_entry_destructor(struct samba_kdc_entry *p)
242 {
243 if (p->entry_ex != NULL) {
244 struct sdb_entry_ex *entry_ex = p->entry_ex;
245 free_sdb_entry(&entry_ex->entry);
246 }
247
248 return 0;
249 }
250
251 /*
252 * Sort keys in descending order of strength.
253 *
254 * Explanaton from Greg Hudson:
255 *
256 * To encrypt tickets only the first returned key is used by the MIT KDC. The
257 * other keys just communicate support for session key enctypes, and aren't
258 * really used. The encryption key for the ticket enc part doesn't have
259 * to be of a type requested by the client. The session key enctype is chosen
260 * based on the client preference order, limited by the set of enctypes present
261 * in the server keys (unless the string attribute is set on the server
262 * principal overriding that set).
263 */
264 static int samba_kdc_sort_encryption_keys(struct sdb_entry_ex *entry_ex)
265 {
266 unsigned int i, j, idx = 0;
267 static const krb5_enctype etype_list[] = {
268 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
269 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
270 ENCTYPE_DES3_CBC_SHA1,
271 ENCTYPE_ARCFOUR_HMAC,
272 ENCTYPE_DES_CBC_MD5,
273 ENCTYPE_DES_CBC_MD4,
274 ENCTYPE_DES_CBC_CRC,
275 ENCTYPE_NULL
276 };
277 size_t etype_len = ARRAY_SIZE(etype_list);
278 size_t keys_size = entry_ex->entry.keys.len;
279 struct sdb_key *keys = entry_ex->entry.keys.val;
280 struct sdb_key *sorted_keys;
281
282 sorted_keys = calloc(keys_size, sizeof(struct sdb_key));
283 if (sorted_keys == NULL) {
284 return -1;
285 }
286
287 for (i = 0; i < etype_len; i++) {
288 for (j = 0; j < keys_size; j++) {
289 const struct sdb_key skey = keys[j];
290
291 if (idx == keys_size) {
292 break;
293 }
294
295 if (KRB5_KEY_TYPE(&skey.key) == etype_list[i]) {
296 sorted_keys[idx] = skey;
297 idx++;
298 }
299 }
300 }
301
302 /* Paranoia: Something went wrong during data copy */
303 if (idx != keys_size) {
304 free(sorted_keys);
305 return -1;
306 }
307
308 free(entry_ex->entry.keys.val);
309 entry_ex->entry.keys.val = sorted_keys;
310
311 return 0;
312 }
313
314 static krb5_error_code samba_kdc_message2entry_keys(krb5_context context,
315 struct samba_kdc_db_context *kdc_db_ctx,
316 TALLOC_CTX *mem_ctx,
317 struct ldb_message *msg,
318 uint32_t rid,
319 bool is_rodc,
320 uint32_t userAccountControl,
321 enum samba_kdc_ent_type ent_type,
322 struct sdb_entry_ex *entry_ex)
323 {
324 krb5_error_code ret = 0;
325 enum ndr_err_code ndr_err;
326 struct samr_Password *hash;
327 const struct ldb_val *sc_val;
328 struct supplementalCredentialsBlob scb;
329 struct supplementalCredentialsPackage *scpk = NULL;
330 bool newer_keys = false;
331 struct package_PrimaryKerberosBlob _pkb;
332 struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
333 struct package_PrimaryKerberosCtr4 *pkb4 = NULL;
334 uint16_t i;
335 uint16_t allocated_keys = 0;
336 int rodc_krbtgt_number = 0;
337 int kvno = 0;
338 uint32_t supported_enctypes
339 = ldb_msg_find_attr_as_uint(msg,
340 "msDS-SupportedEncryptionTypes",
341 0);
342
343 if (rid == DOMAIN_RID_KRBTGT || is_rodc) {
344 /* KDCs (and KDCs on RODCs) use AES */
345 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
346 } else if (userAccountControl & (UF_PARTIAL_SECRETS_ACCOUNT|UF_SERVER_TRUST_ACCOUNT)) {
347 /* DCs and RODCs comptuer accounts use AES */
348 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
349 } else if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT ||
350 (ent_type == SAMBA_KDC_ENT_TYPE_ANY)) {
351 /* for AS-REQ the client chooses the enc types it
352 * supports, and this will vary between computers a
353 * user logs in from.
354 *
355 * likewise for 'any' return as much as is supported,
356 * to export into a keytab */
357 supported_enctypes = ENC_ALL_TYPES;
358 }
359
360 /* If UF_USE_DES_KEY_ONLY has been set, then don't allow use of the newer enc types */
361 if (userAccountControl & UF_USE_DES_KEY_ONLY) {
362 supported_enctypes = ENC_CRC32|ENC_RSA_MD5;
363 } else {
364 /* Otherwise, add in the default enc types */
365 supported_enctypes |= ENC_CRC32 | ENC_RSA_MD5 | ENC_RC4_HMAC_MD5;
366 }
367
368 /* Is this the krbtgt or a RODC krbtgt */
369 if (is_rodc) {
370 rodc_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
371
372 if (rodc_krbtgt_number == -1) {
373 return EINVAL;
374 }
375 }
376
377 entry_ex->entry.keys.val = NULL;
378 entry_ex->entry.keys.len = 0;
379 entry_ex->entry.kvno = 0;
380
381 if ((ent_type == SAMBA_KDC_ENT_TYPE_CLIENT)
382 && (userAccountControl & UF_SMARTCARD_REQUIRED)) {
383 uint8_t secretbuffer[32];
384
385 /*
386 * Fake keys until we have a better way to reject
387 * non-pkinit requests.
388 *
389 * We just need to indicate which encryption types are
390 * supported.
391 */
392 generate_secret_buffer(secretbuffer, sizeof(secretbuffer));
393
394 allocated_keys = 3;
395 entry_ex->entry.keys.len = 0;
396 entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(struct sdb_key));
397 if (entry_ex->entry.keys.val == NULL) {
398 ZERO_STRUCT(secretbuffer);
399 ret = ENOMEM;
400 goto out;
401 }
402
403 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
404 struct sdb_key key = {};
405
406 ret = smb_krb5_keyblock_init_contents(context,
407 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
408 secretbuffer, 32,
409 &key.key);
410 if (ret) {
411 ZERO_STRUCT(secretbuffer);
412 goto out;
413 }
414
415 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
416 entry_ex->entry.keys.len++;
417 }
418
419 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
420 struct sdb_key key = {};
421
422 ret = smb_krb5_keyblock_init_contents(context,
423 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
424 secretbuffer, 16,
425 &key.key);
426 if (ret) {
427 ZERO_STRUCT(secretbuffer);
428 goto out;
429 }
430
431 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
432 entry_ex->entry.keys.len++;
433 }
434
435 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
436 struct sdb_key key = {};
437
438 ret = smb_krb5_keyblock_init_contents(context,
439 ENCTYPE_ARCFOUR_HMAC,
440 secretbuffer, 16,
441 &key.key);
442 if (ret) {
443 ZERO_STRUCT(secretbuffer);
444 goto out;
445 }
446
447 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
448 entry_ex->entry.keys.len++;
449 }
450
451 ret = 0;
452 goto out;
453 }
454
455 kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
456 if (is_rodc) {
457 kvno = SAMBA_KVNO_AND_KRBTGT(kvno, rodc_krbtgt_number);
458 }
459 entry_ex->entry.kvno = kvno;
460
461 /* Get keys from the db */
462
463 hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
464 sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
465
466 /* unicodePwd for enctype 0x17 (23) if present */
467 if (hash) {
468 allocated_keys++;
469 }
470
471 /* supplementalCredentials if present */
472 if (sc_val) {
473 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, &scb,
474 (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
475 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
476 dump_data(0, sc_val->data, sc_val->length);
477 ret = EINVAL;
478 goto out;
479 }
480
481 if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) {
482 if (scb.sub.num_packages != 0) {
483 NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
484 ret = EINVAL;
485 goto out;
486 }
487 }
488
489 for (i=0; i < scb.sub.num_packages; i++) {
490 if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) {
491 scpk = &scb.sub.packages[i];
492 if (!scpk->data || !scpk->data[0]) {
493 scpk = NULL;
494 continue;
495 }
496 newer_keys = true;
497 break;
498 } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) {
499 scpk = &scb.sub.packages[i];
500 if (!scpk->data || !scpk->data[0]) {
501 scpk = NULL;
502 }
503 /*
504 * we don't break here in hope to find
505 * a Kerberos-Newer-Keys package
506 */
507 }
508 }
509 }
510 /*
511 * Primary:Kerberos-Newer-Keys or Primary:Kerberos element
512 * of supplementalCredentials
513 */
514 if (scpk) {
515 DATA_BLOB blob;
516
517 blob = strhex_to_data_blob(mem_ctx, scpk->data);
518 if (!blob.data) {
519 ret = ENOMEM;
520 goto out;
521 }
522
523 /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */
524 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &_pkb,
525 (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
526 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
527 ret = EINVAL;
528 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
529 krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
530 goto out;
531 }
532
533 if (newer_keys && _pkb.version != 4) {
534 ret = EINVAL;
535 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
536 krb5_warnx(context, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
537 goto out;
538 }
539
540 if (!newer_keys && _pkb.version != 3) {
541 ret = EINVAL;
542 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
543 krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
544 goto out;
545 }
546
547 if (_pkb.version == 4) {
548 pkb4 = &_pkb.ctr.ctr4;
549 allocated_keys += pkb4->num_keys;
550 } else if (_pkb.version == 3) {
551 pkb3 = &_pkb.ctr.ctr3;
552 allocated_keys += pkb3->num_keys;
553 }
554 }
555
556 if (allocated_keys == 0) {
557 if (kdc_db_ctx->rodc) {
558 /* We are on an RODC, but don't have keys for this account. Signal this to the caller */
559 auth_sam_trigger_repl_secret(kdc_db_ctx, kdc_db_ctx->msg_ctx,
560 kdc_db_ctx->ev_ctx, msg->dn);
561 return SDB_ERR_NOT_FOUND_HERE;
562 }
563
564 /* oh, no password. Apparently (comment in
565 * hdb-ldap.c) this violates the ASN.1, but this
566 * allows an entry with no keys (yet). */
567 return 0;
568 }
569
570 /* allocate space to decode into */
571 entry_ex->entry.keys.len = 0;
572 entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(struct sdb_key));
573 if (entry_ex->entry.keys.val == NULL) {
574 ret = ENOMEM;
575 goto out;
576 }
577
578 if (hash && (supported_enctypes & ENC_RC4_HMAC_MD5)) {
579 struct sdb_key key = {};
580
581 ret = smb_krb5_keyblock_init_contents(context,
582 ENCTYPE_ARCFOUR_HMAC,
583 hash->hash,
584 sizeof(hash->hash),
585 &key.key);
586 if (ret) {
587 goto out;
588 }
589
590 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
591 entry_ex->entry.keys.len++;
592 }
593
594 if (pkb4) {
595 for (i=0; i < pkb4->num_keys; i++) {
596 struct sdb_key key = {};
597
598 if (!pkb4->keys[i].value) continue;
599
600 if (!(kerberos_enctype_to_bitmap(pkb4->keys[i].keytype) & supported_enctypes)) {
601 continue;
602 }
603
604 if (pkb4->salt.string) {
605 DATA_BLOB salt;
606
607 salt = data_blob_string_const(pkb4->salt.string);
608
609 key.salt = calloc(1, sizeof(*key.salt));
610 if (key.salt == NULL) {
611 ret = ENOMEM;
612 goto out;
613 }
614
615 key.salt->type = KRB5_PW_SALT;
616
617 ret = smb_krb5_copy_data_contents(&key.salt->salt,
618 salt.data,
619 salt.length);
620 if (ret) {
621 free(key.salt);
622 key.salt = NULL;
623 goto out;
624 }
625 }
626
627 /* TODO: maybe pass the iteration_count somehow... */
628
629 ret = smb_krb5_keyblock_init_contents(context,
630 pkb4->keys[i].keytype,
631 pkb4->keys[i].value->data,
632 pkb4->keys[i].value->length,
633 &key.key);
634 if (ret == KRB5_PROG_ETYPE_NOSUPP) {
635 DEBUG(2,("Unsupported keytype ignored - type %u\n",
636 pkb4->keys[i].keytype));
637 ret = 0;
638 continue;
639 }
640 if (ret) {
641 if (key.salt) {
642 smb_krb5_free_data_contents(context, &key.salt->salt);
643 free(key.salt);
644 key.salt = NULL;
645 }
646 goto out;
647 }
648
649 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
650 entry_ex->entry.keys.len++;
651 }
652 } else if (pkb3) {
653 for (i=0; i < pkb3->num_keys; i++) {
654 struct sdb_key key = {};
655
656 if (!pkb3->keys[i].value) continue;
657
658 if (!(kerberos_enctype_to_bitmap(pkb3->keys[i].keytype) & supported_enctypes)) {
659 continue;
660 }
661
662 if (pkb3->salt.string) {
663 DATA_BLOB salt;
664
665 salt = data_blob_string_const(pkb3->salt.string);
666
667 key.salt = calloc(1, sizeof(*key.salt));
668 if (key.salt == NULL) {
669 ret = ENOMEM;
670 goto out;
671 }
672
673 key.salt->type = KRB5_PW_SALT;
674
675 ret = smb_krb5_copy_data_contents(&key.salt->salt,
676 salt.data,
677 salt.length);
678 if (ret) {
679 free(key.salt);
680 key.salt = NULL;
681 goto out;
682 }
683 }
684
685 ret = smb_krb5_keyblock_init_contents(context,
686 pkb3->keys[i].keytype,
687 pkb3->keys[i].value->data,
688 pkb3->keys[i].value->length,
689 &key.key);
690 if (ret) {
691 if (key.salt) {
692 smb_krb5_free_data_contents(context, &key.salt->salt);
693 free(key.salt);
694 key.salt = NULL;
695 }
696 goto out;
697 }
698
699 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
700 entry_ex->entry.keys.len++;
701 }
702 }
703
704 out:
705 if (ret != 0) {
706 entry_ex->entry.keys.len = 0;
707 } else if (entry_ex->entry.keys.len > 0 &&
708 entry_ex->entry.keys.val != NULL) {
709 ret = samba_kdc_sort_encryption_keys(entry_ex);
710 if (ret != 0) {
711 entry_ex->entry.keys.len = 0;
712 ret = ENOMEM;
713 }
714 }
715 if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
716 free(entry_ex->entry.keys.val);
717 entry_ex->entry.keys.val = NULL;
718 }
719 return ret;
720 }
721
722 static int principal_comp_strcmp_int(krb5_context context,
723 krb5_const_principal principal,
724 unsigned int component,
725 const char *string,
726 bool do_strcasecmp)
727 {
728 const char *p;
729 size_t len;
730
731 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
732 p = krb5_principal_get_comp_string(context, principal, component);
733 if (p == NULL) {
734 return -1;
735 }
736 len = strlen(p);
737 #else
738 krb5_data *d;
739 if (component >= krb5_princ_size(context, principal)) {
740 return -1;
741 }
742
743 d = krb5_princ_component(context, principal, component);
744 if (d == NULL) {
745 return -1;
746 }
747
748 p = d->data;
749 len = d->length;
750 #endif
751 if (do_strcasecmp) {
752 return strncasecmp(p, string, len);
753 } else {
754 return strncmp(p, string, len);
755 }
756 }
757
758 static int principal_comp_strcasecmp(krb5_context context,
759 krb5_const_principal principal,
760 unsigned int component,
761 const char *string)
762 {
763 return principal_comp_strcmp_int(context, principal,
764 component, string, true);
765 }
766
767 static int principal_comp_strcmp(krb5_context context,
768 krb5_const_principal principal,
769 unsigned int component,
770 const char *string)
771 {
772 return principal_comp_strcmp_int(context, principal,
773 component, string, false);
774 }
775
776 /*
777 * Construct an hdb_entry from a directory entry.
778 */
779 static krb5_error_code samba_kdc_message2entry(krb5_context context,
780 struct samba_kdc_db_context *kdc_db_ctx,
781 TALLOC_CTX *mem_ctx,
782 krb5_const_principal principal,
783 enum samba_kdc_ent_type ent_type,
784 unsigned flags,
785 struct ldb_dn *realm_dn,
786 struct ldb_message *msg,
787 struct sdb_entry_ex *entry_ex)
788 {
789 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
790 uint32_t userAccountControl;
791 uint32_t msDS_User_Account_Control_Computed;
792 krb5_error_code ret = 0;
793 krb5_boolean is_computer = FALSE;
794
795 struct samba_kdc_entry *p;
796 NTTIME acct_expiry;
797 NTSTATUS status;
798
799 uint32_t rid;
800 bool is_rodc = false;
801 struct ldb_message_element *objectclasses;
802 struct ldb_val computer_val;
803 const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
804 computer_val.data = discard_const_p(uint8_t,"computer");
805 computer_val.length = strlen((const char *)computer_val.data);
806
807 if (ldb_msg_find_element(msg, "msDS-SecondaryKrbTgtNumber")) {
808 is_rodc = true;
809 }
810
811 if (!samAccountName) {
812 ret = ENOENT;
813 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no samAccountName present");
814 goto out;
815 }
816
817 objectclasses = ldb_msg_find_element(msg, "objectClass");
818
819 if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
820 is_computer = TRUE;
821 }
822
823 ZERO_STRUCTP(entry_ex);
824
825 p = talloc_zero(mem_ctx, struct samba_kdc_entry);
826 if (!p) {
827 ret = ENOMEM;
828 goto out;
829 }
830
831 p->is_rodc = is_rodc;
832 p->kdc_db_ctx = kdc_db_ctx;
833 p->realm_dn = talloc_reference(p, realm_dn);
834 if (!p->realm_dn) {
835 ret = ENOMEM;
836 goto out;
837 }
838
839 talloc_set_destructor(p, samba_kdc_entry_destructor);
840
841 entry_ex->ctx = p;
842
843 userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
844
845 msDS_User_Account_Control_Computed
846 = ldb_msg_find_attr_as_uint(msg,
847 "msDS-User-Account-Control-Computed",
848 UF_ACCOUNTDISABLE);
849
850 /*
851 * This brings in the lockout flag, block the account if not
852 * found. We need the weird UF_ACCOUNTDISABLE check because
853 * we do not want to fail open if the value is not returned,
854 * but 0 is a valid value (all OK)
855 */
856 if (msDS_User_Account_Control_Computed == UF_ACCOUNTDISABLE) {
857 ret = EINVAL;
858 krb5_set_error_message(context, ret, "samba_kdc_message2entry: "
859 "no msDS-User-Account-Control-Computed present");
860 goto out;
861 } else {
862 userAccountControl |= msDS_User_Account_Control_Computed;
863 }
864
865 /*
866 * If we are set to canonicalize, we get back the fixed UPPER
867 * case realm, and the real username (ie matching LDAP
868 * samAccountName)
869 *
870 * Otherwise, if we are set to enterprise, we
871 * get back the whole principal as-sent
872 *
873 * Finally, if we are not set to canonicalize, we get back the
874 * fixed UPPER case realm, but the as-sent username
875 */
876
877 if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT) {
878 p->is_krbtgt = true;
879
880 if (flags & (SDB_F_CANON)) {
881 /*
882 * When requested to do so, ensure that the
883 * both realm values in the principal are set
884 * to the upper case, canonical realm
885 */
886 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal,
887 lpcfg_realm(lp_ctx), "krbtgt",
888 lpcfg_realm(lp_ctx), NULL);
889 if (ret) {
890 krb5_clear_error_message(context);
891 goto out;
892 }
893 smb_krb5_principal_set_type(context, entry_ex->entry.principal, KRB5_NT_SRV_INST);
894 } else {
895 ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
896 if (ret) {
897 krb5_clear_error_message(context);
898 goto out;
899 }
900 /*
901 * this appears to be required regardless of
902 * the canonicalize flag from the client
903 */
904 ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
905 if (ret) {
906 krb5_clear_error_message(context);
907 goto out;
908 }
909 }
910
911 } else if (ent_type == SAMBA_KDC_ENT_TYPE_ANY && principal == NULL) {
912 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
913 if (ret) {
914 krb5_clear_error_message(context);
915 goto out;
916 }
917 } else if ((flags & SDB_F_CANON) && (flags & SDB_F_FOR_AS_REQ)) {
918 /*
919 * SDB_F_CANON maps from the canonicalize flag in the
920 * packet, and has a different meaning between AS-REQ
921 * and TGS-REQ. We only change the principal in the AS-REQ case
922 */
923 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
924 if (ret) {
925 krb5_clear_error_message(context);
926 goto out;
927 }
928 } else {
929 ret = krb5_copy_principal(context, principal, &entry_ex->entry.principal);
930 if (ret) {
931 krb5_clear_error_message(context);
932 goto out;
933 }
934
935 if (smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL) {
936 /* While we have copied the client principal, tests
937 * show that Win2k3 returns the 'corrected' realm, not
938 * the client-specified realm. This code attempts to
939 * replace the client principal's realm with the one
940 * we determine from our records */
941
942 /* this has to be with malloc() */
943 ret = smb_krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
944 if (ret) {
945 krb5_clear_error_message(context);
946 goto out;
947 }
948 }
949 }
950
951 /* First try and figure out the flags based on the userAccountControl */
952 entry_ex->entry.flags = uf2SDBFlags(context, userAccountControl, ent_type);
953
954 /* Windows 2008 seems to enforce this (very sensible) rule by
955 * default - don't allow offline attacks on a user's password
956 * by asking for a ticket to them as a service (encrypted with
957 * their probably patheticly insecure password) */
958
959 if (entry_ex->entry.flags.server
960 && lpcfg_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
961 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
962 entry_ex->entry.flags.server = 0;
963 }
964 }
965 /*
966 * To give the correct type of error to the client, we must
967 * not just return the entry without .server set, we must
968 * pretend the principal does not exist. Otherwise we may
969 * return ERR_POLICY instead of
970 * KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
971 */
972 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER && entry_ex->entry.flags.server == 0) {
973 ret = SDB_ERR_NOENTRY;
974 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no servicePrincipalName present for this server, refusing with no-such-entry");
975 goto out;
976 }
977 if (flags & SDB_F_ADMIN_DATA) {
978 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
979 * of the Heimdal KDC. They are stored in a the traditional
980 * DB for audit purposes, and still form part of the structure
981 * we must return */
982
983 /* use 'whenCreated' */
984 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
985 /* use 'kadmin' for now (needed by mit_samba) */
986
987 ret = smb_krb5_make_principal(context,
988 &entry_ex->entry.created_by.principal,
989 lpcfg_realm(lp_ctx), "kadmin", NULL);
990 if (ret) {
991 krb5_clear_error_message(context);
992 goto out;
993 }
994
995 entry_ex->entry.modified_by = (struct sdb_event *) malloc(sizeof(struct sdb_event));
996 if (entry_ex->entry.modified_by == NULL) {
997 ret = ENOMEM;
998 krb5_set_error_message(context, ret, "malloc: out of memory");
999 goto out;
1000 }
1001
1002 /* use 'whenChanged' */
1003 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
1004 /* use 'kadmin' for now (needed by mit_samba) */
1005 ret = smb_krb5_make_principal(context,
1006 &entry_ex->entry.modified_by->principal,
1007 lpcfg_realm(lp_ctx), "kadmin", NULL);
1008 if (ret) {
1009 krb5_clear_error_message(context);
1010 goto out;
1011 }
1012 }
1013
1014
1015 /* The lack of password controls etc applies to krbtgt by
1016 * virtue of being that particular RID */
1017 status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
1018
1019 if (!NT_STATUS_IS_OK(status)) {
1020 ret = EINVAL;
1021 goto out;
1022 }
1023
1024 if (rid == DOMAIN_RID_KRBTGT) {
1025 char *realm = NULL;
1026
1027 entry_ex->entry.valid_end = NULL;
1028 entry_ex->entry.pw_end = NULL;
1029
1030 entry_ex->entry.flags.invalid = 0;
1031 entry_ex->entry.flags.server = 1;
1032
1033 realm = smb_krb5_principal_get_realm(
1034 mem_ctx, context, principal);
1035 if (realm == NULL) {
1036 ret = ENOMEM;
1037 goto out;
1038 }
1039
1040 /* Don't mark all requests for the krbtgt/realm as
1041 * 'change password', as otherwise we could get into
1042 * trouble, and not enforce the password expirty.
1043 * Instead, only do it when request is for the kpasswd service */
1044 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER
1045 && krb5_princ_size(context, principal) == 2
1046 && (principal_comp_strcmp(context, principal, 0, "kadmin") == 0)
1047 && (principal_comp_strcmp(context, principal, 1, "changepw") == 0)
1048 && lpcfg_is_my_domain_or_realm(lp_ctx, realm)) {
1049 entry_ex->entry.flags.change_pw = 1;
1050 }
1051
1052 TALLOC_FREE(realm);
1053
1054 entry_ex->entry.flags.client = 0;
1055 entry_ex->entry.flags.forwardable = 1;
1056 entry_ex->entry.flags.ok_as_delegate = 1;
1057 } else if (is_rodc) {
1058 /* The RODC krbtgt account is like the main krbtgt,
1059 * but it does not have a changepw or kadmin
1060 * service */
1061
1062 entry_ex->entry.valid_end = NULL;
1063 entry_ex->entry.pw_end = NULL;
1064
1065 /* Also don't allow the RODC krbtgt to be a client (it should not be needed) */
1066 entry_ex->entry.flags.client = 0;
1067 entry_ex->entry.flags.invalid = 0;
1068 entry_ex->entry.flags.server = 1;
1069
1070 entry_ex->entry.flags.client = 0;
1071 entry_ex->entry.flags.forwardable = 1;
1072 entry_ex->entry.flags.ok_as_delegate = 0;
1073 } else if (entry_ex->entry.flags.server && ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
1074 /* The account/password expiry only applies when the account is used as a
1075 * client (ie password login), not when used as a server */
1076
1077 /* Make very well sure we don't use this for a client,
1078 * it could bypass the password restrictions */
1079 entry_ex->entry.flags.client = 0;
1080
1081 entry_ex->entry.valid_end = NULL;
1082 entry_ex->entry.pw_end = NULL;
1083
1084 } else {
1085 NTTIME must_change_time
1086 = samdb_result_nttime(msg,
1087 "msDS-UserPasswordExpiryTimeComputed",
1088 0);
1089 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
1090 entry_ex->entry.pw_end = NULL;
1091 } else {
1092 entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
1093 if (entry_ex->entry.pw_end == NULL) {
1094 ret = ENOMEM;
1095 goto out;
1096 }
1097 *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
1098 }
1099
1100 acct_expiry = samdb_result_account_expires(msg);
1101 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
1102 entry_ex->entry.valid_end = NULL;
1103 } else {
1104 entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
1105 if (entry_ex->entry.valid_end == NULL) {
1106 ret = ENOMEM;
1107 goto out;
1108 }
1109 *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
1110 }
1111 }
1112
1113 entry_ex->entry.valid_start = NULL;
1114
1115 entry_ex->entry.max_life = malloc(sizeof(*entry_ex->entry.max_life));
1116 if (entry_ex->entry.max_life == NULL) {
1117 ret = ENOMEM;
1118 goto out;
1119 }
1120
1121 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
1122 *entry_ex->entry.max_life = kdc_db_ctx->policy.svc_tkt_lifetime;
1123 } else if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT || ent_type == SAMBA_KDC_ENT_TYPE_CLIENT) {
1124 *entry_ex->entry.max_life = kdc_db_ctx->policy.usr_tkt_lifetime;
1125 } else {
1126 *entry_ex->entry.max_life = MIN(kdc_db_ctx->policy.svc_tkt_lifetime,
1127 kdc_db_ctx->policy.usr_tkt_lifetime);
1128 }
1129
1130 entry_ex->entry.max_renew = malloc(sizeof(*entry_ex->entry.max_life));
1131 if (entry_ex->entry.max_renew == NULL) {
1132 ret = ENOMEM;
1133 goto out;
1134 }
1135
1136 *entry_ex->entry.max_renew = kdc_db_ctx->policy.renewal_lifetime;
1137
1138 /* Get keys from the db */
1139 ret = samba_kdc_message2entry_keys(context, kdc_db_ctx, p, msg,
1140 rid, is_rodc, userAccountControl,
1141 ent_type, entry_ex);
1142 if (ret) {
1143 /* Could be bogus data in the entry, or out of memory */
1144 goto out;
1145 }
1146
1147 p->msg = talloc_steal(p, msg);
1148
1149 out:
1150 if (ret != 0) {
1151 /* This doesn't free ent itself, that is for the eventual caller to do */
1152 sdb_free_entry(entry_ex);
1153 ZERO_STRUCTP(entry_ex);
1154 } else {
1155 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1156 }
1157
1158 return ret;
1159 }
1160
1161 /*
1162 * Construct an hdb_entry from a directory entry.
1163 * The kvno is what the remote client asked for
1164 */
1165 static krb5_error_code samba_kdc_trust_message2entry(krb5_context context,
1166 struct samba_kdc_db_context *kdc_db_ctx,
1167 TALLOC_CTX *mem_ctx, krb5_const_principal principal,
1168 enum trust_direction direction,
1169 struct ldb_dn *realm_dn,
1170 unsigned flags,
1171 uint32_t kvno,
1172 struct ldb_message *msg,
1173 struct sdb_entry_ex *entry_ex)
1174 {
1175 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1176 const char *our_realm = lpcfg_realm(lp_ctx);
1177 char *partner_realm = NULL;
1178 const char *realm = NULL;
1179 const char *krbtgt_realm = NULL;
1180 DATA_BLOB password_utf16 = data_blob_null;
1181 DATA_BLOB password_utf8 = data_blob_null;
1182 struct samr_Password _password_hash;
1183 const struct samr_Password *password_hash = NULL;
1184 const struct ldb_val *password_val;
1185 struct trustAuthInOutBlob password_blob;
1186 struct samba_kdc_entry *p;
1187 bool use_previous = false;
1188 uint32_t current_kvno;
1189 uint32_t previous_kvno;
1190 uint32_t num_keys = 0;
1191 enum ndr_err_code ndr_err;
1192 int ret;
1193 unsigned int i;
1194 struct AuthenticationInformationArray *auth_array;
1195 struct timeval tv;
1196 NTTIME an_hour_ago;
1197 uint32_t *auth_kvno;
1198 bool preferr_current = false;
1199 uint32_t supported_enctypes = ENC_RC4_HMAC_MD5;
1200 struct lsa_TrustDomainInfoInfoEx *tdo = NULL;
1201 NTSTATUS status;
1202
1203 if (dsdb_functional_level(kdc_db_ctx->samdb) >= DS_DOMAIN_FUNCTION_2008) {
1204 supported_enctypes = ldb_msg_find_attr_as_uint(msg,
1205 "msDS-SupportedEncryptionTypes",
1206 supported_enctypes);
1207 }
1208
1209 status = dsdb_trust_parse_tdo_info(mem_ctx, msg, &tdo);
1210 if (!NT_STATUS_IS_OK(status)) {
1211 krb5_clear_error_message(context);
1212 ret = ENOMEM;
1213 goto out;
1214 }
1215
1216 if (!(tdo->trust_direction & direction)) {
1217 krb5_clear_error_message(context);
1218 ret = SDB_ERR_NOENTRY;
1219 goto out;
1220 }
1221
1222 if (tdo->trust_type != LSA_TRUST_TYPE_UPLEVEL) {
1223 /*
1224 * Only UPLEVEL domains support kerberos here,
1225 * as we don't support LSA_TRUST_TYPE_MIT.
1226 */
1227 krb5_clear_error_message(context);
1228 ret = SDB_ERR_NOENTRY;
1229 goto out;
1230 }
1231
1232 if (tdo->trust_attributes & LSA_TRUST_ATTRIBUTE_CROSS_ORGANIZATION) {
1233 /*
1234 * We don't support selective authentication yet.
1235 */
1236 krb5_clear_error_message(context);
1237 ret = SDB_ERR_NOENTRY;
1238 goto out;
1239 }
1240
1241 if (tdo->domain_name.string == NULL) {
1242 krb5_clear_error_message(context);
1243 ret = SDB_ERR_NOENTRY;
1244 goto out;
1245 }
1246 partner_realm = strupper_talloc(mem_ctx, tdo->domain_name.string);
1247 if (partner_realm == NULL) {
1248 krb5_clear_error_message(context);
1249 ret = ENOMEM;
1250 goto out;
1251 }
1252
1253 if (direction == INBOUND) {
1254 realm = our_realm;
1255 krbtgt_realm = partner_realm;
1256
1257 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
1258 } else { /* OUTBOUND */
1259 realm = partner_realm;
1260 krbtgt_realm = our_realm;
1261
1262 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
1263 }
1264
1265 if (password_val == NULL) {
1266 krb5_clear_error_message(context);
1267 ret = SDB_ERR_NOENTRY;
1268 goto out;
1269 }
1270
1271 ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, &password_blob,
1272 (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
1273 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1274 krb5_clear_error_message(context);
1275 ret = EINVAL;
1276 goto out;
1277 }
1278
1279 p = talloc_zero(mem_ctx, struct samba_kdc_entry);
1280 if (!p) {
1281 ret = ENOMEM;
1282 goto out;
1283 }
1284
1285 p->is_trust = true;
1286 p->kdc_db_ctx = kdc_db_ctx;
1287 p->realm_dn = realm_dn;
1288
1289 talloc_set_destructor(p, samba_kdc_entry_destructor);
1290
1291 /* make sure we do not have bogus data in there */
1292 memset(&entry_ex->entry, 0, sizeof(struct sdb_entry));
1293
1294 entry_ex->ctx = p;
1295
1296 /* use 'whenCreated' */
1297 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
1298 /* use 'kadmin' for now (needed by mit_samba) */
1299 ret = smb_krb5_make_principal(context,
1300 &entry_ex->entry.created_by.principal,
1301 realm, "kadmin", NULL);
1302 if (ret) {
1303 krb5_clear_error_message(context);
1304 goto out;
1305 }
1306
1307 /*
1308 * We always need to generate the canonicalized principal
1309 * with the values of our database.
1310 */
1311 ret = smb_krb5_make_principal(context, &entry_ex->entry.principal, realm,
1312 "krbtgt", krbtgt_realm, NULL);
1313 if (ret) {
1314 krb5_clear_error_message(context);
1315 goto out;
1316 }
1317 smb_krb5_principal_set_type(context, entry_ex->entry.principal,
1318 KRB5_NT_SRV_INST);
1319
1320 entry_ex->entry.valid_start = NULL;
1321
1322 /* we need to work out if we are going to use the current or
1323 * the previous password hash.
1324 * We base this on the kvno the client passes in. If the kvno
1325 * passed in is equal to the current kvno in our database then
1326 * we use the current structure. If it is the current kvno-1,
1327 * then we use the previous substrucure.
1328 */
1329
1330 /*
1331 * Windows preferrs the previous key for one hour.
1332 */
1333 tv = timeval_current();
1334 if (tv.tv_sec > 3600) {
1335 tv.tv_sec -= 3600;
1336 }
1337 an_hour_ago = timeval_to_nttime(&tv);
1338
1339 /* first work out the current kvno */
1340 current_kvno = 0;
1341 for (i=0; i < password_blob.count; i++) {
1342 struct AuthenticationInformation *a =
1343 &password_blob.current.array[i];
1344
1345 if (a->LastUpdateTime <= an_hour_ago) {
1346 preferr_current = true;
1347 }
1348
1349 if (a->AuthType == TRUST_AUTH_TYPE_VERSION) {
1350 current_kvno = a->AuthInfo.version.version;
1351 }
1352 }
1353 if (current_kvno == 0) {
1354 previous_kvno = 255;
1355 } else {
1356 previous_kvno = current_kvno - 1;
1357 }
1358 for (i=0; i < password_blob.count; i++) {
1359 struct AuthenticationInformation *a =
1360 &password_blob.previous.array[i];
1361
1362 if (a->AuthType == TRUST_AUTH_TYPE_VERSION) {
1363 previous_kvno = a->AuthInfo.version.version;
1364 }
1365 }
1366
1367 /* work out whether we will use the previous or current
1368 password */
1369 if (password_blob.previous.count == 0) {
1370 /* there is no previous password */
1371 use_previous = false;
1372 } else if (!(flags & SDB_F_KVNO_SPECIFIED)) {
1373 /*
1374 * If not specified we use the lowest kvno
1375 * for the first hour after an update.
1376 */
1377 if (preferr_current) {
1378 use_previous = false;
1379 } else if (previous_kvno < current_kvno) {
1380 use_previous = true;
1381 } else {
1382 use_previous = false;
1383 }
1384 } else if (kvno == current_kvno) {
1385 /*
1386 * Exact match ...
1387 */
1388 use_previous = false;
1389 } else if (kvno == previous_kvno) {
1390 /*
1391 * Exact match ...
1392 */
1393 use_previous = true;
1394 } else {
1395 /*
1396 * Fallback to the current one for anything else
1397 */
1398 use_previous = false;
1399 }
1400
1401 if (use_previous) {
1402 auth_array = &password_blob.previous;
1403 auth_kvno = &previous_kvno;
1404 } else {
1405 auth_array = &password_blob.current;
1406 auth_kvno = &current_kvno;
1407 }
1408
1409 /* use the kvno the client specified, if available */
1410 if (flags & SDB_F_KVNO_SPECIFIED) {
1411 entry_ex->entry.kvno = kvno;
1412 } else {
1413 entry_ex->entry.kvno = *auth_kvno;
1414 }
1415
1416 for (i=0; i < auth_array->count; i++) {
1417 if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
1418 bool ok;
1419
1420 password_utf16 = data_blob_const(auth_array->array[i].AuthInfo.clear.password,
1421 auth_array->array[i].AuthInfo.clear.size);
1422 if (password_utf16.length == 0) {
1423 break;
1424 }
1425
1426 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1427 mdfour(_password_hash.hash, password_utf16.data, password_utf16.length);
1428 if (password_hash == NULL) {
1429 num_keys += 1;
1430 }
1431 password_hash = &_password_hash;
1432 }
1433
1434 if (!(supported_enctypes & (ENC_HMAC_SHA1_96_AES128|ENC_HMAC_SHA1_96_AES256))) {
1435 break;
1436 }
1437
1438 ok = convert_string_talloc(mem_ctx,
1439 CH_UTF16MUNGED, CH_UTF8,
1440 password_utf16.data,
1441 password_utf16.length,
1442 (void *)&password_utf8.data,
1443 &password_utf8.length);
1444 if (!ok) {
1445 krb5_clear_error_message(context);
1446 ret = ENOMEM;
1447 goto out;
1448 }
1449
1450 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1451 num_keys += 1;
1452 }
1453 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1454 num_keys += 1;
1455 }
1456 break;
1457 } else if (auth_array->array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
1458 if (supported_enctypes & ENC_RC4_HMAC_MD5) {
1459 password_hash = &auth_array->array[i].AuthInfo.nt4owf.password;
1460 num_keys += 1;
1461 }
1462 }
1463 }
1464
1465 /* Must have found a cleartext or MD4 password */
1466 if (num_keys == 0) {
1467 DEBUG(1,(__location__ ": no usable key found\n"));
1468 krb5_clear_error_message(context);
1469 ret = SDB_ERR_NOENTRY;
1470 goto out;
1471 }
1472
1473 entry_ex->entry.keys.val = calloc(num_keys, sizeof(struct sdb_key));
1474 if (entry_ex->entry.keys.val == NULL) {
1475 krb5_clear_error_message(context);
1476 ret = ENOMEM;
1477 goto out;
1478 }
1479
1480 if (password_utf8.length != 0) {
1481 struct sdb_key key = {};
1482 krb5_const_principal salt_principal = entry_ex->entry.principal;
1483 krb5_data salt;
1484 krb5_data cleartext_data;
1485
1486 cleartext_data.data = discard_const_p(char, password_utf8.data);
1487 cleartext_data.length = password_utf8.length;
1488
1489 ret = smb_krb5_get_pw_salt(context,
1490 salt_principal,
1491 &salt);
1492 if (ret != 0) {
1493 goto out;
1494 }
1495
1496 if (supported_enctypes & ENC_HMAC_SHA1_96_AES256) {
1497 ret = smb_krb5_create_key_from_string(context,
1498 salt_principal,
1499 &salt,
1500 &cleartext_data,
1501 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
1502 &key.key);
1503 if (ret != 0) {
1504 smb_krb5_free_data_contents(context, &salt);
1505 goto out;
1506 }
1507
1508 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1509 entry_ex->entry.keys.len++;
1510 }
1511
1512 if (supported_enctypes & ENC_HMAC_SHA1_96_AES128) {
1513 ret = smb_krb5_create_key_from_string(context,
1514 salt_principal,
1515 &salt,
1516 &cleartext_data,
1517 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
1518 &key.key);
1519 if (ret != 0) {
1520 smb_krb5_free_data_contents(context, &salt);
1521 goto out;
1522 }
1523
1524 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1525 entry_ex->entry.keys.len++;
1526 }
1527
1528 smb_krb5_free_data_contents(context, &salt);
1529 }
1530
1531 if (password_hash != NULL) {
1532 struct sdb_key key = {};
1533
1534 ret = smb_krb5_keyblock_init_contents(context,
1535 ENCTYPE_ARCFOUR_HMAC,
1536 password_hash->hash,
1537 sizeof(password_hash->hash),
1538 &key.key);
1539 if (ret != 0) {
1540 goto out;
1541 }
1542
1543 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
1544 entry_ex->entry.keys.len++;
1545 }
1546
1547 entry_ex->entry.flags = int2SDBFlags(0);
1548 entry_ex->entry.flags.immutable = 1;
1549 entry_ex->entry.flags.invalid = 0;
1550 entry_ex->entry.flags.server = 1;
1551 entry_ex->entry.flags.require_preauth = 1;
1552
1553 entry_ex->entry.pw_end = NULL;
1554
1555 entry_ex->entry.max_life = NULL;
1556
1557 entry_ex->entry.max_renew = NULL;
1558
1559 ret = samba_kdc_sort_encryption_keys(entry_ex);
1560 if (ret != 0) {
1561 krb5_clear_error_message(context);
1562 ret = ENOMEM;
1563 goto out;
1564 }
1565
1566 p->msg = talloc_steal(p, msg);
1567
1568 out:
1569 TALLOC_FREE(partner_realm);
1570
1571 if (ret != 0) {
1572 /* This doesn't free ent itself, that is for the eventual caller to do */
1573 sdb_free_entry(entry_ex);
1574 } else {
1575 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1576 }
1577
1578 return ret;
1579
1580 }
1581
1582 static krb5_error_code samba_kdc_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
1583 TALLOC_CTX *mem_ctx,
1584 const char *realm,
1585 struct ldb_dn *realm_dn,
1586 struct ldb_message **pmsg)
1587 {
1588 NTSTATUS status;
1589 const char * const *attrs = trust_attrs;
1590
1591 status = dsdb_trust_search_tdo(ldb_ctx, realm, realm,
1592 attrs, mem_ctx, pmsg);
1593 if (NT_STATUS_IS_OK(status)) {
1594 return 0;
1595 } else if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1596 return SDB_ERR_NOENTRY;
1597 } else if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1598 int ret = ENOMEM;
1599 krb5_set_error_message(context, ret, "get_sam_result_trust: out of memory");
1600 return ret;
1601 } else {
1602 int ret = EINVAL;
1603 krb5_set_error_message(context, ret, "get_sam_result_trust: %s", nt_errstr(status));
1604 return ret;
1605 }
1606 }
1607
1608 static krb5_error_code samba_kdc_lookup_client(krb5_context context,
1609 struct samba_kdc_db_context *kdc_db_ctx,
1610 TALLOC_CTX *mem_ctx,
1611 krb5_const_principal principal,
1612 const char **attrs,
1613 struct ldb_dn **realm_dn,
1614 struct ldb_message **msg)
1615 {
1616 NTSTATUS nt_status;
1617 char *principal_string = NULL;
1618
1619 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1620 principal_string = smb_krb5_principal_get_comp_string(mem_ctx, context,
1621 principal, 0);
1622 if (principal_string == NULL) {
1623 return ENOMEM;
1624 }
1625 } else {
1626 char *principal_string_m = NULL;
1627 krb5_error_code ret;
1628
1629 ret = krb5_unparse_name(context, principal, &principal_string_m);
1630 if (ret != 0) {
1631 return ret;
1632 }
1633
1634 principal_string = talloc_strdup(mem_ctx, principal_string_m);
1635 SAFE_FREE(principal_string_m);
1636 if (principal_string == NULL) {
1637 return ENOMEM;
1638 }
1639 }
1640
1641 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1642 mem_ctx, principal_string, attrs,
1643 realm_dn, msg);
1644 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1645 krb5_principal fallback_principal = NULL;
1646 unsigned int num_comp;
1647 char *fallback_realm = NULL;
1648 char *fallback_account = NULL;
1649 krb5_error_code ret;
1650
1651 ret = krb5_parse_name(context, principal_string,
1652 &fallback_principal);
1653 TALLOC_FREE(principal_string);
1654 if (ret != 0) {
1655 return ret;
1656 }
1657
1658 num_comp = krb5_princ_size(context, fallback_principal);
1659 fallback_realm = smb_krb5_principal_get_realm(
1660 mem_ctx, context, fallback_principal);
1661 if (fallback_realm == NULL) {
1662 krb5_free_principal(context, fallback_principal);
1663 return ENOMEM;
1664 }
1665
1666 if (num_comp == 1) {
1667 size_t len;
1668
1669 fallback_account = smb_krb5_principal_get_comp_string(mem_ctx,
1670 context, fallback_principal, 0);
1671 if (fallback_account == NULL) {
1672 krb5_free_principal(context, fallback_principal);
1673 TALLOC_FREE(fallback_realm);
1674 return ENOMEM;
1675 }
1676
1677 len = strlen(fallback_account);
1678 if (len >= 2 && fallback_account[len - 1] == '$') {
1679 TALLOC_FREE(fallback_account);
1680 }
1681 }
1682 krb5_free_principal(context, fallback_principal);
1683 fallback_principal = NULL;
1684
1685 if (fallback_account != NULL) {
1686 char *with_dollar;
1687
1688 with_dollar = talloc_asprintf(mem_ctx, "%s$",
1689 fallback_account);
1690 if (with_dollar == NULL) {
1691 TALLOC_FREE(fallback_realm);
1692 return ENOMEM;
1693 }
1694 TALLOC_FREE(fallback_account);
1695
1696 ret = smb_krb5_make_principal(context,
1697 &fallback_principal,
1698 fallback_realm,
1699 with_dollar, NULL);
1700 TALLOC_FREE(with_dollar);
1701 if (ret != 0) {
1702 TALLOC_FREE(fallback_realm);
1703 return ret;
1704 }
1705 }
1706 TALLOC_FREE(fallback_realm);
1707
1708 if (fallback_principal != NULL) {
1709 char *fallback_string = NULL;
1710
1711 ret = krb5_unparse_name(context,
1712 fallback_principal,
1713 &fallback_string);
1714 if (ret != 0) {
1715 krb5_free_principal(context, fallback_principal);
1716 return ret;
1717 }
1718
1719 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1720 mem_ctx,
1721 fallback_string,
1722 attrs,
1723 realm_dn, msg);
1724 SAFE_FREE(fallback_string);
1725 }
1726 krb5_free_principal(context, fallback_principal);
1727 fallback_principal = NULL;
1728 }
1729 TALLOC_FREE(principal_string);
1730
1731 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1732 return SDB_ERR_NOENTRY;
1733 } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1734 return ENOMEM;
1735 } else if (!NT_STATUS_IS_OK(nt_status)) {
1736 return EINVAL;
1737 }
1738
1739 return 0;
1740 }
1741
1742 static krb5_error_code samba_kdc_fetch_client(krb5_context context,
1743 struct samba_kdc_db_context *kdc_db_ctx,
1744 TALLOC_CTX *mem_ctx,
1745 krb5_const_principal principal,
1746 unsigned flags,
1747 struct sdb_entry_ex *entry_ex) {
1748 struct ldb_dn *realm_dn;
1749 krb5_error_code ret;
1750 struct ldb_message *msg = NULL;
1751
1752 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1753 mem_ctx, principal, user_attrs,
1754 &realm_dn, &msg);
1755 if (ret != 0) {
1756 return ret;
1757 }
1758
1759 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1760 principal, SAMBA_KDC_ENT_TYPE_CLIENT,
1761 flags,
1762 realm_dn, msg, entry_ex);
1763 return ret;
1764 }
1765
1766 static krb5_error_code samba_kdc_fetch_krbtgt(krb5_context context,
1767 struct samba_kdc_db_context *kdc_db_ctx,
1768 TALLOC_CTX *mem_ctx,
1769 krb5_const_principal principal,
1770 unsigned flags,
1771 uint32_t kvno,
1772 struct sdb_entry_ex *entry_ex)
1773 {
1774 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1775 krb5_error_code ret;
1776 struct ldb_message *msg = NULL;
1777 struct ldb_dn *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1778 char *realm_from_princ;
1779 char *realm_princ_comp = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 1);
1780
1781 realm_from_princ = smb_krb5_principal_get_realm(
1782 mem_ctx, context, principal);
1783 if (realm_from_princ == NULL) {
1784 /* can't happen */
1785 return SDB_ERR_NOENTRY;
1786 }
1787
1788 if (krb5_princ_size(context, principal) != 2
1789 || (principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME) != 0)) {
1790 /* Not a krbtgt */
1791 return SDB_ERR_NOENTRY;
1792 }
1793
1794 /* krbtgt case. Either us or a trusted realm */
1795
1796 if (lpcfg_is_my_domain_or_realm(lp_ctx, realm_from_princ)
1797 && lpcfg_is_my_domain_or_realm(lp_ctx, realm_princ_comp)) {
1798 /* us, or someone quite like us */
1799 /* Cludge, cludge cludge. If the realm part of krbtgt/realm,
1800 * is in our db, then direct the caller at our primary
1801 * krbtgt */
1802
1803 int lret;
1804 unsigned int krbtgt_number;
1805 /* w2k8r2 sometimes gives us a kvno of 255 for inter-domain
1806 trust tickets. We don't yet know what this means, but we do
1807 seem to need to treat it as unspecified */
1808 if (flags & SDB_F_KVNO_SPECIFIED) {
1809 krbtgt_number = SAMBA_KVNO_GET_KRBTGT(kvno);
1810 if (kdc_db_ctx->rodc) {
1811 if (krbtgt_number != kdc_db_ctx->my_krbtgt_number) {
1812 return SDB_ERR_NOT_FOUND_HERE;
1813 }
1814 }
1815 } else {
1816 krbtgt_number = kdc_db_ctx->my_krbtgt_number;
1817 }
1818
1819 if (krbtgt_number == kdc_db_ctx->my_krbtgt_number) {
1820 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1821 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
1822 krbtgt_attrs, DSDB_SEARCH_NO_GLOBAL_CATALOG,
1823 "(objectClass=user)");
1824 } else {
1825 /* We need to look up an RODC krbtgt (perhaps
1826 * ours, if we are an RODC, perhaps another
1827 * RODC if we are a read-write DC */
1828 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1829 &msg, realm_dn, LDB_SCOPE_SUBTREE,
1830 krbtgt_attrs,
1831 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1832 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=%u))", (unsigned)(krbtgt_number));
1833 }
1834
1835 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1836 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1837 (unsigned)(krbtgt_number));
1838 krb5_set_error_message(context, SDB_ERR_NOENTRY,
1839 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1840 (unsigned)(krbtgt_number));
1841 return SDB_ERR_NOENTRY;
1842 } else if (lret != LDB_SUCCESS) {
1843 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1844 (unsigned)(krbtgt_number));
1845 krb5_set_error_message(context, SDB_ERR_NOENTRY,
1846 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1847 (unsigned)(krbtgt_number));
1848 return SDB_ERR_NOENTRY;
1849 }
1850
1851 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1852 principal, SAMBA_KDC_ENT_TYPE_KRBTGT,
1853 flags, realm_dn, msg, entry_ex);
1854 if (ret != 0) {
1855 krb5_warnx(context, "samba_kdc_fetch: self krbtgt message2entry failed");
1856 }
1857 return ret;
1858
1859 } else {
1860 enum trust_direction direction = UNKNOWN;
1861 const char *realm = NULL;
1862
1863 /* Either an inbound or outbound trust */
1864
1865 if (strcasecmp(lpcfg_realm(lp_ctx), realm_from_princ) == 0) {
1866 /* look for inbound trust */
1867 direction = INBOUND;
1868 realm = realm_princ_comp;
1869 } else if (principal_comp_strcasecmp(context, principal, 1, lpcfg_realm(lp_ctx)) == 0) {
1870 /* look for outbound trust */
1871 direction = OUTBOUND;
1872 realm = realm_from_princ;
1873 } else {
1874 krb5_warnx(context, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1875 realm_from_princ,
1876 realm_princ_comp);
1877 krb5_set_error_message(context, SDB_ERR_NOENTRY, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1878 realm_from_princ,
1879 realm_princ_comp);
1880 return SDB_ERR_NOENTRY;
1881 }
1882
1883 /* Trusted domains are under CN=system */
1884
1885 ret = samba_kdc_lookup_trust(context, kdc_db_ctx->samdb,
1886 mem_ctx,
1887 realm, realm_dn, &msg);
1888
1889 if (ret != 0) {
1890 krb5_warnx(context, "samba_kdc_fetch: could not find principal in DB");
1891 krb5_set_error_message(context, ret, "samba_kdc_fetch: could not find principal in DB");
1892 return ret;
1893 }
1894
1895 ret = samba_kdc_trust_message2entry(context, kdc_db_ctx, mem_ctx,
1896 principal, direction,
1897 realm_dn, flags, kvno, msg, entry_ex);
1898 if (ret != 0) {
1899 krb5_warnx(context, "samba_kdc_fetch: trust_message2entry failed for %s",
1900 ldb_dn_get_linearized(msg->dn));
1901 krb5_set_error_message(context, ret, "samba_kdc_fetch: "
1902 "trust_message2entry failed for %s",
1903 ldb_dn_get_linearized(msg->dn));
1904 }
1905 return ret;
1906 }
1907
1908 }
1909
1910 static krb5_error_code samba_kdc_lookup_server(krb5_context context,
1911 struct samba_kdc_db_context *kdc_db_ctx,
1912 TALLOC_CTX *mem_ctx,
1913 krb5_const_principal principal,
1914 unsigned flags,
1915 const char **attrs,
1916 struct ldb_dn **realm_dn,
1917 struct ldb_message **msg)
1918 {
1919 krb5_error_code ret;
1920 if ((smb_krb5_principal_get_type(context, principal) != KRB5_NT_ENTERPRISE_PRINCIPAL)
1921 && krb5_princ_size(context, principal) >= 2) {
1922 /* 'normal server' case */
1923 int ldb_ret;
1924 NTSTATUS nt_status;
1925 struct ldb_dn *user_dn;
1926 char *principal_string;
1927
1928 ret = krb5_unparse_name_flags(context, principal,
1929 KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1930 &principal_string);
1931 if (ret != 0) {
1932 return ret;
1933 }
1934
1935 /* At this point we may find the host is known to be
1936 * in a different realm, so we should generate a
1937 * referral instead */
1938 nt_status = crack_service_principal_name(kdc_db_ctx->samdb,
1939 mem_ctx, principal_string,
1940 &user_dn, realm_dn);
1941 free(principal_string);
1942
1943 if (!NT_STATUS_IS_OK(nt_status)) {
1944 return SDB_ERR_NOENTRY;
1945 }
1946
1947 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb,
1948 mem_ctx,
1949 msg, user_dn, LDB_SCOPE_BASE,
1950 attrs,
1951 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
1952 "(objectClass=*)");
1953 if (ldb_ret != LDB_SUCCESS) {
1954 return SDB_ERR_NOENTRY;
1955 }
1956 return 0;
1957 } else if (!(flags & SDB_F_FOR_AS_REQ)
1958 && smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1959 /*
1960 * The behaviour of accepting an
1961 * KRB5_NT_ENTERPRISE_PRINCIPAL server principal
1962 * containing a UPN only applies to TGS-REQ packets,
1963 * not AS-REQ packets.
1964 */
1965 return samba_kdc_lookup_client(context, kdc_db_ctx,
1966 mem_ctx, principal, attrs,
1967 realm_dn, msg);
1968 } else {
1969 /*
1970 * This case is for:
1971 * - the AS-REQ, where we only accept
1972 * samAccountName based lookups for the server, no
1973 * matter if the name is an
1974 * KRB5_NT_ENTERPRISE_PRINCIPAL or not
1975 * - for the TGS-REQ when we are not given an
1976 * KRB5_NT_ENTERPRISE_PRINCIPAL, which also must
1977 * only lookup samAccountName based names.
1978 */
1979 int lret;
1980 char *short_princ;
1981 krb5_principal enterprise_principal = NULL;
1982 krb5_const_principal used_principal = NULL;
1983 char *name1 = NULL;
1984 size_t len1 = 0;
1985 char *filter = NULL;
1986
1987 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1988 char *str = NULL;
1989 /* Need to reparse the enterprise principal to find the real target */
1990 if (krb5_princ_size(context, principal) != 1) {
1991 ret = KRB5_PARSE_MALFORMED;
1992 krb5_set_error_message(context, ret, "samba_kdc_lookup_server: request for an "
1993 "enterprise principal with wrong (%d) number of components",
1994 krb5_princ_size(context, principal));
1995 return ret;
1996 }
1997 str = smb_krb5_principal_get_comp_string(mem_ctx, context, principal, 0);
1998 if (str == NULL) {
1999 return KRB5_PARSE_MALFORMED;
2000 }
2001 ret = krb5_parse_name(context, str,
2002 &enterprise_principal);
2003 talloc_free(str);
2004 if (ret) {
2005 return ret;
2006 }
2007 used_principal = enterprise_principal;
2008 } else {
2009 used_principal = principal;
2010 }
2011
2012 /* server as client principal case, but we must not lookup userPrincipalNames */
2013 *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
2014
2015 /* TODO: Check if it is our realm, otherwise give referral */
2016
2017 ret = krb5_unparse_name_flags(context, used_principal,
2018 KRB5_PRINCIPAL_UNPARSE_NO_REALM |
2019 KRB5_PRINCIPAL_UNPARSE_DISPLAY,
2020 &short_princ);
2021 used_principal = NULL;
2022 krb5_free_principal(context, enterprise_principal);
2023 enterprise_principal = NULL;
2024
2025 if (ret != 0) {
2026 krb5_set_error_message(context, ret, "samba_kdc_lookup_principal: could not parse principal");
2027 krb5_warnx(context, "samba_kdc_lookup_principal: could not parse principal");
2028 return ret;
2029 }
2030
2031 name1 = ldb_binary_encode_string(mem_ctx, short_princ);
2032 SAFE_FREE(short_princ);
2033 if (name1 == NULL) {
2034 return ENOMEM;
2035 }
2036 len1 = strlen(name1);
2037 if (len1 >= 1 && name1[len1 - 1] != '$') {
2038 filter = talloc_asprintf(mem_ctx,
2039 "(&(objectClass=user)(|(samAccountName=%s)(samAccountName=%s$)))",
2040 name1, name1);
2041 if (filter == NULL) {
2042 return ENOMEM;
2043 }
2044 } else {
2045 filter = talloc_asprintf(mem_ctx,
2046 "(&(objectClass=user)(samAccountName=%s))",
2047 name1);
2048 if (filter == NULL) {
2049 return ENOMEM;
2050 }
2051 }
2052
2053 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx, msg,
2054 *realm_dn, LDB_SCOPE_SUBTREE,
2055 attrs,
2056 DSDB_SEARCH_SHOW_EXTENDED_DN | DSDB_SEARCH_NO_GLOBAL_CATALOG,
2057 "%s", filter);
2058 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
2059 DEBUG(10, ("Failed to find an entry for %s filter:%s\n",
2060 name1, filter));
2061 return SDB_ERR_NOENTRY;
2062 }
2063 if (lret == LDB_ERR_CONSTRAINT_VIOLATION) {
2064 DEBUG(10, ("Failed to find unique entry for %s filter:%s\n",
2065 name1, filter));
2066 return SDB_ERR_NOENTRY;
2067 }
2068 if (lret != LDB_SUCCESS) {
2069 DEBUG(0, ("Failed single search for %s - %s\n",
2070 name1, ldb_errstring(kdc_db_ctx->samdb)));
2071 return SDB_ERR_NOENTRY;
2072 }
2073 return 0;
2074 }
2075 return SDB_ERR_NOENTRY;
2076 }
2077
2078
2079
2080 static krb5_error_code samba_kdc_fetch_server(krb5_context context,
2081 struct samba_kdc_db_context *kdc_db_ctx,
2082 TALLOC_CTX *mem_ctx,
2083 krb5_const_principal principal,
2084 unsigned flags,
2085 struct sdb_entry_ex *entry_ex)
2086 {
2087 krb5_error_code ret;
2088 struct ldb_dn *realm_dn;
2089 struct ldb_message *msg;
2090
2091 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, principal,
2092 flags, server_attrs, &realm_dn, &msg);
2093 if (ret != 0) {
2094 return ret;
2095 }
2096
2097 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
2098 principal, SAMBA_KDC_ENT_TYPE_SERVER,
2099 flags,
2100 realm_dn, msg, entry_ex);
2101 if (ret != 0) {
2102 krb5_warnx(context, "samba_kdc_fetch: message2entry failed");
2103 }
2104
2105 return ret;
2106 }
2107
2108 static krb5_error_code samba_kdc_lookup_realm(krb5_context context,
2109 struct samba_kdc_db_context *kdc_db_ctx,
2110 TALLOC_CTX *mem_ctx,
2111 krb5_const_principal principal,
2112 unsigned flags,
2113 struct sdb_entry_ex *entry_ex)
2114 {
2115 TALLOC_CTX *frame = talloc_stackframe();
2116 NTSTATUS status;
2117 krb5_error_code ret;
2118 bool check_realm = false;
2119 const char *realm = NULL;
2120 struct dsdb_trust_routing_table *trt = NULL;
2121 const struct lsa_TrustDomainInfoInfoEx *tdo = NULL;
2122 unsigned int num_comp;
2123 bool ok;
2124 char *upper = NULL;
2125
2126 num_comp = krb5_princ_size(context, principal);
2127
2128 if (flags & SDB_F_GET_CLIENT) {
2129 if (flags & SDB_F_FOR_AS_REQ) {
2130 check_realm = true;
2131 }
2132 }
2133 if (flags & SDB_F_GET_SERVER) {
2134 if (flags & SDB_F_FOR_TGS_REQ) {
2135 check_realm = true;
2136 }
2137 }
2138
2139 if (!check_realm) {
2140 TALLOC_FREE(frame);
2141 return 0;
2142 }
2143
2144 realm = smb_krb5_principal_get_realm(frame, context, principal);
2145 if (realm == NULL) {
2146 TALLOC_FREE(frame);
2147 return ENOMEM;
2148 }
2149
2150 /*
2151 * The requested realm needs to be our own
2152 */
2153 ok = lpcfg_is_my_domain_or_realm(kdc_db_ctx->lp_ctx, realm);
2154 if (!ok) {
2155 /*
2156 * The request is not for us...
2157 */
2158 TALLOC_FREE(frame);
2159 return SDB_ERR_NOENTRY;
2160 }
2161
2162 if (smb_krb5_principal_get_type(context, principal) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
2163 char *principal_string = NULL;
2164 krb5_principal enterprise_principal = NULL;
2165 char *enterprise_realm = NULL;
2166
2167 if (num_comp != 1) {
2168 TALLOC_FREE(frame);
2169 return SDB_ERR_NOENTRY;
2170 }
2171
2172 principal_string = smb_krb5_principal_get_comp_string(frame, context,
2173 principal, 0);
2174 if (principal_string == NULL) {
2175 TALLOC_FREE(frame);
2176 return ENOMEM;
2177 }
2178
2179 ret = krb5_parse_name(context, principal_string,
2180 &enterprise_principal);
2181 TALLOC_FREE(principal_string);
2182 if (ret) {
2183 TALLOC_FREE(frame);
2184 return ret;
2185 }
2186
2187 enterprise_realm = smb_krb5_principal_get_realm(
2188 frame, context, enterprise_principal);
2189 krb5_free_principal(context, enterprise_principal);
2190 if (enterprise_realm != NULL) {
2191 realm = enterprise_realm;
2192 }
2193 }
2194
2195 if (flags & SDB_F_GET_SERVER) {
2196 char *service_realm = NULL;
2197
2198 ret = principal_comp_strcmp(context, principal, 0, KRB5_TGS_NAME);
2199 if (ret == 0) {
2200 /*
2201 * we need to search krbtgt/ locally
2202 */
2203 TALLOC_FREE(frame);
2204 return 0;
2205 }
2206
2207 /*
2208 * We need to check the last component against the routing table.
2209 *
2210 * Note this works only with 2 or 3 component principals, e.g:
2211 *
2212 * servicePrincipalName: ldap/W2K8R2-219.bla.base
2213 * servicePrincipalName: ldap/W2K8R2-219.bla.base/bla.base
2214 * servicePrincipalName: ldap/W2K8R2-219.bla.base/ForestDnsZones.bla.base
2215 * servicePrincipalName: ldap/W2K8R2-219.bla.base/DomainDnsZones.bla.base
2216 */
2217
2218 if (num_comp == 2 || num_comp == 3) {
2219 service_realm = smb_krb5_principal_get_comp_string(frame,
2220 context,
2221 principal,
2222 num_comp - 1);
2223 }
2224
2225 if (service_realm != NULL) {
2226 realm = service_realm;
2227 }
2228 }
2229
2230 ok = lpcfg_is_my_domain_or_realm(kdc_db_ctx->lp_ctx, realm);
2231 if (ok) {
2232 /*
2233 * skip the expensive routing lookup
2234 */
2235 TALLOC_FREE(frame);
2236 return 0;
2237 }
2238
2239 status = dsdb_trust_routing_table_load(kdc_db_ctx->samdb,
2240 frame, &trt);
2241 if (!NT_STATUS_IS_OK(status)) {
2242 TALLOC_FREE(frame);
2243 return EINVAL;
2244 }
2245
2246 tdo = dsdb_trust_routing_by_name(trt, realm);
2247 if (tdo == NULL) {
2248 /*
2249 * This principal has to be local
2250 */
2251 TALLOC_FREE(frame);
2252 return 0;
2253 }
2254
2255 if (tdo->trust_attributes & LSA_TRUST_ATTRIBUTE_WITHIN_FOREST) {
2256 /*
2257 * TODO: handle the routing within the forest
2258 *
2259 * This should likely be handled in
2260 * samba_kdc_message2entry() in case we're
2261 * a global catalog. We'd need to check
2262 * if realm_dn is our own domain and derive
2263 * the dns domain name from realm_dn and check that
2264 * against the routing table or fallback to
2265 * the tdo we found here.
2266 *
2267 * But for now we don't support multiple domains
2268 * in our forest correctly anyway.
2269 *
2270 * Just search in our local database.
2271 */
2272 TALLOC_FREE(frame);
2273 return 0;
2274 }
2275
2276 ZERO_STRUCT(entry_ex->entry);
2277
2278 ret = krb5_copy_principal(context, principal,
2279 &entry_ex->entry.principal);
2280 if (ret) {
2281 TALLOC_FREE(frame);
2282 return ret;
2283 }
2284
2285 upper = strupper_talloc(frame, tdo->domain_name.string);
2286 if (upper == NULL) {
2287 TALLOC_FREE(frame);
2288 return ENOMEM;
2289 }
2290
2291 ret = smb_krb5_principal_set_realm(context,
2292 entry_ex->entry.principal,
2293 upper);
2294 if (ret) {
2295 TALLOC_FREE(frame);
2296 return ret;
2297 }
2298
2299 TALLOC_FREE(frame);
2300 return SDB_ERR_WRONG_REALM;
2301 }
2302
2303 krb5_error_code samba_kdc_fetch(krb5_context context,
2304 struct samba_kdc_db_context *kdc_db_ctx,
2305 krb5_const_principal principal,
2306 unsigned flags,
2307 krb5_kvno kvno,
2308 struct sdb_entry_ex *entry_ex)
2309 {
2310 krb5_error_code ret = SDB_ERR_NOENTRY;
2311 TALLOC_CTX *mem_ctx;
2312
2313 mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_fetch context");
2314 if (!mem_ctx) {
2315 ret = ENOMEM;
2316 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2317 return ret;
2318 }
2319
2320 ret = samba_kdc_lookup_realm(context, kdc_db_ctx, mem_ctx,
2321 principal, flags, entry_ex);
2322 if (ret != 0) {
2323 goto done;
2324 }
2325
2326 ret = SDB_ERR_NOENTRY;
2327
2328 if (flags & SDB_F_GET_CLIENT) {
2329 ret = samba_kdc_fetch_client(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
2330 if (ret != SDB_ERR_NOENTRY) goto done;
2331 }
2332 if (flags & SDB_F_GET_SERVER) {
2333 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
2334 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
2335 if (ret != SDB_ERR_NOENTRY) goto done;
2336
2337 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
2338 ret = samba_kdc_fetch_server(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
2339 if (ret != SDB_ERR_NOENTRY) goto done;
2340 }
2341 if (flags & SDB_F_GET_KRBTGT) {
2342 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, kvno, entry_ex);
2343 if (ret != SDB_ERR_NOENTRY) goto done;
2344 }
2345
2346 done:
2347 talloc_free(mem_ctx);
2348 return ret;
2349 }
2350
2351 struct samba_kdc_seq {
2352 unsigned int index;
2353 unsigned int count;
2354 struct ldb_message **msgs;
2355 struct ldb_dn *realm_dn;
2356 };
2357
2358 static krb5_error_code samba_kdc_seq(krb5_context context,
2359 struct samba_kdc_db_context *kdc_db_ctx,
2360 struct sdb_entry_ex *entry)
2361 {
2362 krb5_error_code ret;
2363 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
2364 const char *realm = lpcfg_realm(kdc_db_ctx->lp_ctx);
2365 struct ldb_message *msg = NULL;
2366 const char *sAMAccountName = NULL;
2367 krb5_principal principal = NULL;
2368 TALLOC_CTX *mem_ctx;
2369
2370 if (!priv) {
2371 return SDB_ERR_NOENTRY;
2372 }
2373
2374 mem_ctx = talloc_named(priv, 0, "samba_kdc_seq context");
2375
2376 if (!mem_ctx) {
2377 ret = ENOMEM;
2378 krb5_set_error_message(context, ret, "samba_kdc_seq: talloc_named() failed!");
2379 return ret;
2380 }
2381
2382 while (priv->index < priv->count) {
2383 msg = priv->msgs[priv->index++];
2384
2385 sAMAccountName = ldb_msg_find_attr_as_string(msg, "sAMAccountName", NULL);
2386 if (sAMAccountName != NULL) {
2387 break;
2388 }
2389 }
2390
2391 if (sAMAccountName == NULL) {
2392 ret = SDB_ERR_NOENTRY;
2393 goto out;
2394 }
2395
2396 ret = smb_krb5_make_principal(context, &principal,
2397 realm, sAMAccountName, NULL);
2398 if (ret != 0) {
2399 goto out;
2400 }
2401
2402 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
2403 principal, SAMBA_KDC_ENT_TYPE_ANY,
2404 SDB_F_ADMIN_DATA|SDB_F_GET_ANY,
2405 priv->realm_dn, msg, entry);
2406
2407 out:
2408 if (principal != NULL) {
2409 krb5_free_principal(context, principal);
2410 }
2411
2412 if (ret != 0) {
2413 TALLOC_FREE(priv);
2414 kdc_db_ctx->seq_ctx = NULL;
2415 } else {
2416 talloc_free(mem_ctx);
2417 }
2418
2419 return ret;
2420 }
2421
2422 krb5_error_code samba_kdc_firstkey(krb5_context context,
2423 struct samba_kdc_db_context *kdc_db_ctx,
2424 struct sdb_entry_ex *entry)
2425 {
2426 struct ldb_context *ldb_ctx = kdc_db_ctx->samdb;
2427 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
2428 char *realm;
2429 struct ldb_result *res = NULL;
2430 krb5_error_code ret;
2431 TALLOC_CTX *mem_ctx;
2432 int lret;
2433
2434 if (priv) {
2435 TALLOC_FREE(priv);
2436 kdc_db_ctx->seq_ctx = NULL;
2437 }
2438
2439 priv = (struct samba_kdc_seq *) talloc(kdc_db_ctx, struct samba_kdc_seq);
2440 if (!priv) {
2441 ret = ENOMEM;
2442 krb5_set_error_message(context, ret, "talloc: out of memory");
2443 return ret;
2444 }
2445
2446 priv->index = 0;
2447 priv->msgs = NULL;
2448 priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
2449 priv->count = 0;
2450
2451 mem_ctx = talloc_named(priv, 0, "samba_kdc_firstkey context");
2452
2453 if (!mem_ctx) {
2454 ret = ENOMEM;
2455 krb5_set_error_message(context, ret, "samba_kdc_firstkey: talloc_named() failed!");
2456 return ret;
2457 }
2458
2459 ret = krb5_get_default_realm(context, &realm);
2460 if (ret != 0) {
2461 TALLOC_FREE(priv);
2462 return ret;
2463 }
2464 krb5_free_default_realm(context, realm);
2465
2466 lret = dsdb_search(ldb_ctx, priv, &res,
2467 priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
2468 DSDB_SEARCH_NO_GLOBAL_CATALOG,
2469 "(objectClass=user)");
2470
2471 if (lret != LDB_SUCCESS) {
2472 TALLOC_FREE(priv);
2473 return SDB_ERR_NOENTRY;
2474 }
2475
2476 priv->count = res->count;
2477 priv->msgs = talloc_steal(priv, res->msgs);
2478 talloc_free(res);
2479
2480 kdc_db_ctx->seq_ctx = priv;
2481
2482 ret = samba_kdc_seq(context, kdc_db_ctx, entry);
2483
2484 if (ret != 0) {
2485 TALLOC_FREE(priv);
2486 kdc_db_ctx->seq_ctx = NULL;
2487 } else {
2488 talloc_free(mem_ctx);
2489 }
2490 return ret;
2491 }
2492
2493 krb5_error_code samba_kdc_nextkey(krb5_context context,
2494 struct samba_kdc_db_context *kdc_db_ctx,
2495 struct sdb_entry_ex *entry)
2496 {
2497 return samba_kdc_seq(context, kdc_db_ctx, entry);
2498 }
2499
2500 /* Check if a given entry may delegate or do s4u2self to this target principal
2501 *
2502 * This is currently a very nasty hack - allowing only delegation to itself.
2503 */
2504 krb5_error_code
2505 samba_kdc_check_s4u2self(krb5_context context,
2506 struct samba_kdc_db_context *kdc_db_ctx,
2507 struct samba_kdc_entry *skdc_entry,
2508 krb5_const_principal target_principal)
2509 {
2510 krb5_error_code ret;
2511 struct ldb_dn *realm_dn;
2512 struct ldb_message *msg;
2513 struct dom_sid *orig_sid;
2514 struct dom_sid *target_sid;
2515 const char *delegation_check_attrs[] = {
2516 "objectSid", NULL
2517 };
2518
2519 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2self");
2520
2521 if (!mem_ctx) {
2522 ret = ENOMEM;
2523 krb5_set_error_message(context, ret, "samba_kdc_check_s4u2self: talloc_named() failed!");
2524 return ret;
2525 }
2526
2527 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, target_principal,
2528 SDB_F_GET_CLIENT|SDB_F_GET_SERVER,
2529 delegation_check_attrs, &realm_dn, &msg);
2530
2531 if (ret != 0) {
2532 talloc_free(mem_ctx);
2533 return ret;
2534 }
2535
2536 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2537 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2538
2539 /* Allow delegation to the same principal, even if by a different
2540 * name. The easy and safe way to prove this is by SID
2541 * comparison */
2542 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2543 talloc_free(mem_ctx);
2544 return KRB5KDC_ERR_BADOPTION;
2545 }
2546
2547 talloc_free(mem_ctx);
2548 return ret;
2549 }
2550
2551 /* Certificates printed by a the Certificate Authority might have a
2552 * slightly different form of the user principal name to that in the
2553 * database. Allow a mismatch where they both refer to the same
2554 * SID */
2555
2556 krb5_error_code
2557 samba_kdc_check_pkinit_ms_upn_match(krb5_context context,
2558 struct samba_kdc_db_context *kdc_db_ctx,
2559 struct samba_kdc_entry *skdc_entry,
2560 krb5_const_principal certificate_principal)
2561 {
2562 krb5_error_code ret;
2563 struct ldb_dn *realm_dn;
2564 struct ldb_message *msg;
2565 struct dom_sid *orig_sid;
2566 struct dom_sid *target_sid;
2567 const char *ms_upn_check_attrs[] = {
2568 "objectSid", NULL
2569 };
2570
2571 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_pkinit_ms_upn_match");
2572
2573 if (!mem_ctx) {
2574 ret = ENOMEM;
2575 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
2576 return ret;
2577 }
2578
2579 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
2580 mem_ctx, certificate_principal,
2581 ms_upn_check_attrs, &realm_dn, &msg);
2582
2583 if (ret != 0) {
2584 talloc_free(mem_ctx);
2585 return ret;
2586 }
2587
2588 orig_sid = samdb_result_dom_sid(mem_ctx, skdc_entry->msg, "objectSid");
2589 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
2590
2591 /* Consider these to be the same principal, even if by a different
2592 * name. The easy and safe way to prove this is by SID
2593 * comparison */
2594 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
2595 talloc_free(mem_ctx);
2596 #if defined(KRB5KDC_ERR_CLIENT_NAME_MISMATCH) /* MIT */
2597 return KRB5KDC_ERR_CLIENT_NAME_MISMATCH;
2598 #else /* Heimdal (where this is an enum) */
2599 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
2600 #endif
2601 }
2602
2603 talloc_free(mem_ctx);
2604 return ret;
2605 }
2606
2607 /*
2608 * Check if a given entry may delegate to this target principal
2609 * with S4U2Proxy.
2610 */
2611 krb5_error_code
2612 samba_kdc_check_s4u2proxy(krb5_context context,
2613 struct samba_kdc_db_context *kdc_db_ctx,
2614 struct samba_kdc_entry *skdc_entry,
2615 krb5_const_principal target_principal)
2616 {
2617 krb5_error_code ret;
2618 char *tmp = NULL;
2619 const char *client_dn = NULL;
2620 const char *target_principal_name = NULL;
2621 struct ldb_message_element *el;
2622 struct ldb_val val;
2623 unsigned int i;
2624 bool found = false;
2625
2626 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2proxy");
2627
2628 if (!mem_ctx) {
2629 ret = ENOMEM;
2630 krb5_set_error_message(context, ret,
2631 "samba_kdc_check_s4u2proxy:"
2632 " talloc_named() failed!");
2633 return ret;
2634 }
2635
2636 client_dn = ldb_dn_get_linearized(skdc_entry->msg->dn);
2637 if (!client_dn) {
2638 if (errno == 0) {
2639 errno = ENOMEM;
2640 }
2641 ret = errno;
2642 krb5_set_error_message(context, ret,
2643 "samba_kdc_check_s4u2proxy:"
2644 " ldb_dn_get_linearized() failed!");
2645 return ret;
2646 }
2647
2648 /*
2649 * The main heimdal code already checked that the target_principal
2650 * belongs to the same realm as the client.
2651 *
2652 * So we just need the principal without the realm,
2653 * as that is what is configured in the "msDS-AllowedToDelegateTo"
2654 * attribute.
2655 */
2656 ret = krb5_unparse_name_flags(context, target_principal,
2657 KRB5_PRINCIPAL_UNPARSE_NO_REALM, &tmp);
2658 if (ret) {
2659 talloc_free(mem_ctx);
2660 krb5_set_error_message(context, ret,
2661 "samba_kdc_check_s4u2proxy:"
2662 " krb5_unparse_name() failed!");
2663 return ret;
2664 }
2665 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] for target[%s]\n",
2666 client_dn, tmp));
2667
2668 target_principal_name = talloc_strdup(mem_ctx, tmp);
2669 SAFE_FREE(tmp);
2670 if (target_principal_name == NULL) {
2671 ret = ENOMEM;
2672 krb5_set_error_message(context, ret,
2673 "samba_kdc_check_s4u2proxy:"
2674 " talloc_strdup() failed!");
2675 return ret;
2676 }
2677
2678 el = ldb_msg_find_element(skdc_entry->msg, "msDS-AllowedToDelegateTo");
2679 if (el == NULL) {
2680 goto bad_option;
2681 }
2682
2683 val = data_blob_string_const(target_principal_name);
2684
2685 for (i=0; i<el->num_values; i++) {
2686 struct ldb_val *val1 = &val;
2687 struct ldb_val *val2 = &el->values[i];
2688 int cmp;
2689
2690 if (val1->length != val2->length) {
2691 continue;
2692 }
2693
2694 cmp = strncasecmp((const char *)val1->data,
2695 (const char *)val2->data,
2696 val1->length);
2697 if (cmp != 0) {
2698 continue;
2699 }
2700
2701 found = true;
2702 break;
2703 }
2704
2705 if (!found) {
2706 goto bad_option;
2707 }
2708
2709 DEBUG(10,("samba_kdc_check_s4u2proxy: client[%s] allowed target[%s]\n",
2710 client_dn, tmp));
2711 talloc_free(mem_ctx);
2712 return 0;
2713
2714 bad_option:
2715 krb5_set_error_message(context, ret,
2716 "samba_kdc_check_s4u2proxy: client[%s] "
2717 "not allowed for delegation to target[%s]",
2718 client_dn,
2719 target_principal_name);
2720 talloc_free(mem_ctx);
2721 return KRB5KDC_ERR_BADOPTION;
2722 }
2723
2724 NTSTATUS samba_kdc_setup_db_ctx(TALLOC_CTX *mem_ctx, struct samba_kdc_base_context *base_ctx,
2725 struct samba_kdc_db_context **kdc_db_ctx_out)
2726 {
2727 int ldb_ret;
2728 struct ldb_message *msg;
2729 struct auth_session_info *session_info;
2730 struct samba_kdc_db_context *kdc_db_ctx;
2731 /* The idea here is very simple. Using Kerberos to
2732 * authenticate the KDC to the LDAP server is higly likely to
2733 * be circular.
2734 *
2735 * In future we may set this up to use EXERNAL and SSL
2736 * certificates, for now it will almost certainly be NTLMSSP_SET_USERNAME
2737 */
2738
2739 kdc_db_ctx = talloc_zero(mem_ctx, struct samba_kdc_db_context);
2740 if (kdc_db_ctx == NULL) {
2741 return NT_STATUS_NO_MEMORY;
2742 }
2743 kdc_db_ctx->ev_ctx = base_ctx->ev_ctx;
2744 kdc_db_ctx->lp_ctx = base_ctx->lp_ctx;
2745 kdc_db_ctx->msg_ctx = base_ctx->msg_ctx;
2746
2747 /* get default kdc policy */
2748 lpcfg_default_kdc_policy(mem_ctx,
2749 base_ctx->lp_ctx,
2750 &kdc_db_ctx->policy.svc_tkt_lifetime,
2751 &kdc_db_ctx->policy.usr_tkt_lifetime,
2752 &kdc_db_ctx->policy.renewal_lifetime);
2753
2754 session_info = system_session(kdc_db_ctx->lp_ctx);
2755 if (session_info == NULL) {
2756 return NT_STATUS_INTERNAL_ERROR;
2757 }
2758
2759 /* Setup the link to LDB */
2760 kdc_db_ctx->samdb = samdb_connect(kdc_db_ctx,
2761 base_ctx->ev_ctx,
2762 base_ctx->lp_ctx,
2763 session_info,
2764 NULL,
2765 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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