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pidl:Samba4/Python.pm: use PyString_FromStringOrNULL() from pyrpc_util
[Samba/gebeck_regimport.git] / source4 / kdc / db-glue.c
blob4bb8e3509178ee85f2c886cffe993e54fc13fce3
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 "system/time.h"
26 #include "../libds/common/flags.h"
27 #include "lib/ldb/include/ldb.h"
28 #include "librpc/gen_ndr/netlogon.h"
29 #include "libcli/security/security.h"
30 #include "auth/auth.h"
31 #include "auth/credentials/credentials.h"
32 #include "auth/auth_sam.h"
33 #include "dsdb/samdb/samdb.h"
34 #include "dsdb/common/util.h"
35 #include "librpc/ndr/libndr.h"
36 #include "librpc/gen_ndr/ndr_drsblobs.h"
37 #include "librpc/gen_ndr/lsa.h"
38 #include "libcli/auth/libcli_auth.h"
39 #include "param/param.h"
40 #include "../lib/crypto/md4.h"
41 #include "system/kerberos.h"
42 #include "auth/kerberos/kerberos.h"
43 #include <hdb.h>
44 #include "kdc/samba_kdc.h"
45 #include "kdc/db-glue.h"
46
47 enum samba_kdc_ent_type
48 { SAMBA_KDC_ENT_TYPE_CLIENT, SAMBA_KDC_ENT_TYPE_SERVER,
49 SAMBA_KDC_ENT_TYPE_KRBTGT, SAMBA_KDC_ENT_TYPE_TRUST, SAMBA_KDC_ENT_TYPE_ANY };
50
51 enum trust_direction {
52 UNKNOWN = 0,
53 INBOUND = LSA_TRUST_DIRECTION_INBOUND,
54 OUTBOUND = LSA_TRUST_DIRECTION_OUTBOUND
55 };
56
57 static const char *trust_attrs[] = {
58 "trustPartner",
59 "trustAuthIncoming",
60 "trustAuthOutgoing",
61 "whenCreated",
62 "msDS-SupportedEncryptionTypes",
63 "trustAttributes",
64 "trustDirection",
65 "trustType",
66 NULL
67 };
68
69 static KerberosTime ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, KerberosTime default_val)
70 {
71 const char *tmp;
72 const char *gentime;
73 struct tm tm;
74
75 gentime = ldb_msg_find_attr_as_string(msg, attr, NULL);
76 if (!gentime)
77 return default_val;
78
79 tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
80 if (tmp == NULL) {
81 return default_val;
82 }
83
84 return timegm(&tm);
85 }
86
87 static HDBFlags uf2HDBFlags(krb5_context context, uint32_t userAccountControl, enum samba_kdc_ent_type ent_type)
88 {
89 HDBFlags flags = int2HDBFlags(0);
90
91 /* we don't allow kadmin deletes */
92 flags.immutable = 1;
93
94 /* mark the principal as invalid to start with */
95 flags.invalid = 1;
96
97 flags.renewable = 1;
98
99 /* All accounts are servers, but this may be disabled again in the caller */
100 flags.server = 1;
101
102 /* Account types - clear the invalid bit if it turns out to be valid */
103 if (userAccountControl & UF_NORMAL_ACCOUNT) {
104 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
105 flags.client = 1;
106 }
107 flags.invalid = 0;
108 }
109
110 if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
111 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
112 flags.client = 1;
113 }
114 flags.invalid = 0;
115 }
116 if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
117 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
118 flags.client = 1;
119 }
120 flags.invalid = 0;
121 }
122 if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
123 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
124 flags.client = 1;
125 }
126 flags.invalid = 0;
127 }
128
129 /* Not permitted to act as a client if disabled */
130 if (userAccountControl & UF_ACCOUNTDISABLE) {
131 flags.client = 0;
132 }
133 if (userAccountControl & UF_LOCKOUT) {
134 flags.invalid = 1;
135 }
136 /*
137 if (userAccountControl & UF_PASSWORD_NOTREQD) {
138 flags.invalid = 1;
139 }
140 */
141 /*
142 UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent
143 */
144 if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
145 flags.invalid = 1;
146 }
147
148 /* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in samba_kdc_message2entry() */
149
150 /*
151 if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
152 flags.invalid = 1;
153 }
154 */
155 if (userAccountControl & UF_SMARTCARD_REQUIRED) {
156 flags.require_hwauth = 1;
157 }
158 if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
159 flags.ok_as_delegate = 1;
160 }
161 if (!(userAccountControl & UF_NOT_DELEGATED)) {
162 flags.forwardable = 1;
163 flags.proxiable = 1;
164 }
165
166 if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
167 flags.require_preauth = 0;
168 } else {
169 flags.require_preauth = 1;
170
171 }
172 return flags;
173 }
174
175 static int samba_kdc_entry_destructor(struct samba_kdc_entry *p)
176 {
177 hdb_entry_ex *entry_ex = p->entry_ex;
178 free_hdb_entry(&entry_ex->entry);
179 return 0;
180 }
181
182 static void samba_kdc_free_entry(krb5_context context, hdb_entry_ex *entry_ex)
183 {
184 /* this function is called only from hdb_free_entry().
185 * Make sure we neutralize the destructor or we will
186 * get a double free later when hdb_free_entry() will
187 * try to call free_hdb_entry() */
188 talloc_set_destructor(entry_ex->ctx, NULL);
189
190 /* now proceed to free the talloc part */
191 talloc_free(entry_ex->ctx);
192 }
193
194 static krb5_error_code samba_kdc_message2entry_keys(krb5_context context,
195 struct samba_kdc_db_context *kdc_db_ctx,
196 TALLOC_CTX *mem_ctx,
197 struct ldb_message *msg,
198 uint32_t rid,
199 bool is_rodc,
200 uint32_t userAccountControl,
201 enum samba_kdc_ent_type ent_type,
202 hdb_entry_ex *entry_ex)
203 {
204 krb5_error_code ret = 0;
205 enum ndr_err_code ndr_err;
206 struct samr_Password *hash;
207 const struct ldb_val *sc_val;
208 struct supplementalCredentialsBlob scb;
209 struct supplementalCredentialsPackage *scpk = NULL;
210 bool newer_keys = false;
211 struct package_PrimaryKerberosBlob _pkb;
212 struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
213 struct package_PrimaryKerberosCtr4 *pkb4 = NULL;
214 uint16_t i;
215 uint16_t allocated_keys = 0;
216 int rodc_krbtgt_number = 0;
217 uint32_t supported_enctypes
218 = ldb_msg_find_attr_as_uint(msg,
219 "msDS-SupportedEncryptionTypes",
220 0);
221
222 if (rid == DOMAIN_RID_KRBTGT || is_rodc) {
223 /* KDCs (and KDCs on RODCs) use AES */
224 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
225 } else if (userAccountControl & (UF_PARTIAL_SECRETS_ACCOUNT|UF_SERVER_TRUST_ACCOUNT)) {
226 /* DCs and RODCs comptuer accounts use AES */
227 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
228 } else if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT ||
229 (ent_type == SAMBA_KDC_ENT_TYPE_ANY)) {
230 /* for AS-REQ the client chooses the enc types it
231 * supports, and this will vary between computers a
232 * user logs in from.
233 *
234 * likewise for 'any' return as much as is supported,
235 * to export into a keytab */
236 supported_enctypes = ENC_ALL_TYPES;
237 }
238
239 /* If UF_USE_DES_KEY_ONLY has been set, then don't allow use of the newer enc types */
240 if (userAccountControl & UF_USE_DES_KEY_ONLY) {
241 supported_enctypes = ENC_CRC32|ENC_RSA_MD5;
242 } else {
243 /* Otherwise, add in the default enc types */
244 supported_enctypes |= ENC_CRC32 | ENC_RSA_MD5 | ENC_RC4_HMAC_MD5;
245 }
246
247 /* Is this the krbtgt or a RODC krbtgt */
248 if (is_rodc) {
249 rodc_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
250
251 if (rodc_krbtgt_number == -1) {
252 return EINVAL;
253 }
254 }
255
256
257 entry_ex->entry.keys.val = NULL;
258 entry_ex->entry.keys.len = 0;
259
260 entry_ex->entry.kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
261 if (is_rodc) {
262 entry_ex->entry.kvno |= (rodc_krbtgt_number << 16);
263 }
264
265 /* Get keys from the db */
266
267 hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
268 sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
269
270 /* unicodePwd for enctype 0x17 (23) if present */
271 if (hash) {
272 allocated_keys++;
273 }
274
275 /* supplementalCredentials if present */
276 if (sc_val) {
277 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, &scb,
278 (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
279 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
280 dump_data(0, sc_val->data, sc_val->length);
281 ret = EINVAL;
282 goto out;
283 }
284
285 if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) {
286 NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
287 ret = EINVAL;
288 goto out;
289 }
290
291 for (i=0; i < scb.sub.num_packages; i++) {
292 if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) {
293 scpk = &scb.sub.packages[i];
294 if (!scpk->data || !scpk->data[0]) {
295 scpk = NULL;
296 continue;
297 }
298 newer_keys = true;
299 break;
300 } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) {
301 scpk = &scb.sub.packages[i];
302 if (!scpk->data || !scpk->data[0]) {
303 scpk = NULL;
304 }
305 /*
306 * we don't break here in hope to find
307 * a Kerberos-Newer-Keys package
308 */
309 }
310 }
311 }
312 /*
313 * Primary:Kerberos-Newer-Keys or Primary:Kerberos element
314 * of supplementalCredentials
315 */
316 if (scpk) {
317 DATA_BLOB blob;
318
319 blob = strhex_to_data_blob(mem_ctx, scpk->data);
320 if (!blob.data) {
321 ret = ENOMEM;
322 goto out;
323 }
324
325 /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */
326 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &_pkb,
327 (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
328 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
329 ret = EINVAL;
330 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
331 krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
332 goto out;
333 }
334
335 if (newer_keys && _pkb.version != 4) {
336 ret = EINVAL;
337 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
338 krb5_warnx(context, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
339 goto out;
340 }
341
342 if (!newer_keys && _pkb.version != 3) {
343 ret = EINVAL;
344 krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
345 krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
346 goto out;
347 }
348
349 if (_pkb.version == 4) {
350 pkb4 = &_pkb.ctr.ctr4;
351 allocated_keys += pkb4->num_keys;
352 } else if (_pkb.version == 3) {
353 pkb3 = &_pkb.ctr.ctr3;
354 allocated_keys += pkb3->num_keys;
355 }
356 }
357
358 if (allocated_keys == 0) {
359 if (kdc_db_ctx->rodc) {
360 /* We are on an RODC, but don't have keys for this account. Signal this to the caller */
361 return HDB_ERR_NOT_FOUND_HERE;
362 }
363
364 /* oh, no password. Apparently (comment in
365 * hdb-ldap.c) this violates the ASN.1, but this
366 * allows an entry with no keys (yet). */
367 return 0;
368 }
369
370 /* allocate space to decode into */
371 entry_ex->entry.keys.len = 0;
372 entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(Key));
373 if (entry_ex->entry.keys.val == NULL) {
374 ret = ENOMEM;
375 goto out;
376 }
377
378 if (hash && (supported_enctypes & ENC_RC4_HMAC_MD5)) {
379 Key key;
380
381 key.mkvno = 0;
382 key.salt = NULL; /* No salt for this enc type */
383
384 ret = krb5_keyblock_init(context,
385 ENCTYPE_ARCFOUR_HMAC,
386 hash->hash, sizeof(hash->hash),
387 &key.key);
388 if (ret) {
389 goto out;
390 }
391
392 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
393 entry_ex->entry.keys.len++;
394 }
395
396 if (pkb4) {
397 for (i=0; i < pkb4->num_keys; i++) {
398 Key key;
399
400 if (!pkb4->keys[i].value) continue;
401
402 if (!(kerberos_enctype_to_bitmap(pkb4->keys[i].keytype) & supported_enctypes)) {
403 continue;
404 }
405
406 key.mkvno = 0;
407 key.salt = NULL;
408
409 if (pkb4->salt.string) {
410 DATA_BLOB salt;
411
412 salt = data_blob_string_const(pkb4->salt.string);
413
414 key.salt = calloc(1, sizeof(*key.salt));
415 if (key.salt == NULL) {
416 ret = ENOMEM;
417 goto out;
418 }
419
420 key.salt->type = hdb_pw_salt;
421
422 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
423 if (ret) {
424 free(key.salt);
425 key.salt = NULL;
426 goto out;
427 }
428 }
429
430 /* TODO: maybe pass the iteration_count somehow... */
431
432 ret = krb5_keyblock_init(context,
433 pkb4->keys[i].keytype,
434 pkb4->keys[i].value->data,
435 pkb4->keys[i].value->length,
436 &key.key);
437 if (ret == KRB5_PROG_ETYPE_NOSUPP) {
438 DEBUG(2,("Unsupported keytype ignored - type %u\n",
439 pkb4->keys[i].keytype));
440 ret = 0;
441 continue;
442 }
443 if (ret) {
444 if (key.salt) {
445 free_Salt(key.salt);
446 free(key.salt);
447 key.salt = NULL;
448 }
449 goto out;
450 }
451
452 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
453 entry_ex->entry.keys.len++;
454 }
455 } else if (pkb3) {
456 for (i=0; i < pkb3->num_keys; i++) {
457 Key key;
458
459 if (!pkb3->keys[i].value) continue;
460
461 if (!(kerberos_enctype_to_bitmap(pkb3->keys[i].keytype) & supported_enctypes)) {
462 continue;
463 }
464
465 key.mkvno = 0;
466 key.salt = NULL;
467
468 if (pkb3->salt.string) {
469 DATA_BLOB salt;
470
471 salt = data_blob_string_const(pkb3->salt.string);
472
473 key.salt = calloc(1, sizeof(*key.salt));
474 if (key.salt == NULL) {
475 ret = ENOMEM;
476 goto out;
477 }
478
479 key.salt->type = hdb_pw_salt;
480
481 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
482 if (ret) {
483 free(key.salt);
484 key.salt = NULL;
485 goto out;
486 }
487 }
488
489 ret = krb5_keyblock_init(context,
490 pkb3->keys[i].keytype,
491 pkb3->keys[i].value->data,
492 pkb3->keys[i].value->length,
493 &key.key);
494 if (ret) {
495 if (key.salt) {
496 free_Salt(key.salt);
497 free(key.salt);
498 key.salt = NULL;
499 }
500 goto out;
501 }
502
503 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
504 entry_ex->entry.keys.len++;
505 }
506 }
507
508 out:
509 if (ret != 0) {
510 entry_ex->entry.keys.len = 0;
511 }
512 if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
513 free(entry_ex->entry.keys.val);
514 entry_ex->entry.keys.val = NULL;
515 }
516 return ret;
517 }
518
519 /*
520 * Construct an hdb_entry from a directory entry.
521 */
522 static krb5_error_code samba_kdc_message2entry(krb5_context context,
523 struct samba_kdc_db_context *kdc_db_ctx,
524 TALLOC_CTX *mem_ctx, krb5_const_principal principal,
525 enum samba_kdc_ent_type ent_type,
526 unsigned flags,
527 struct ldb_dn *realm_dn,
528 struct ldb_message *msg,
529 hdb_entry_ex *entry_ex)
530 {
531 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
532 uint32_t userAccountControl;
533 unsigned int i;
534 krb5_error_code ret = 0;
535 krb5_boolean is_computer = FALSE;
536
537 struct samba_kdc_entry *p;
538 NTTIME acct_expiry;
539 NTSTATUS status;
540
541 uint32_t rid;
542 bool is_rodc = false;
543 struct ldb_message_element *objectclasses;
544 struct ldb_val computer_val;
545 const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
546 computer_val.data = discard_const_p(uint8_t,"computer");
547 computer_val.length = strlen((const char *)computer_val.data);
548
549 if (ldb_msg_find_element(msg, "msDS-SecondaryKrbTgtNumber")) {
550 is_rodc = true;
551 }
552
553 if (!samAccountName) {
554 ret = ENOENT;
555 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no samAccountName present");
556 goto out;
557 }
558
559 objectclasses = ldb_msg_find_element(msg, "objectClass");
560
561 if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
562 is_computer = TRUE;
563 }
564
565 memset(entry_ex, 0, sizeof(*entry_ex));
566
567 p = talloc(mem_ctx, struct samba_kdc_entry);
568 if (!p) {
569 ret = ENOMEM;
570 goto out;
571 }
572
573 p->kdc_db_ctx = kdc_db_ctx;
574 p->entry_ex = entry_ex;
575 p->realm_dn = talloc_reference(p, realm_dn);
576 if (!p->realm_dn) {
577 ret = ENOMEM;
578 goto out;
579 }
580
581 talloc_set_destructor(p, samba_kdc_entry_destructor);
582
583 /* make sure we do not have bogus data in there */
584 memset(&entry_ex->entry, 0, sizeof(hdb_entry));
585
586 entry_ex->ctx = p;
587 entry_ex->free_entry = samba_kdc_free_entry;
588
589 userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
590
591
592 entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
593 if (ent_type == SAMBA_KDC_ENT_TYPE_ANY && principal == NULL) {
594 krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
595 } else {
596 ret = copy_Principal(principal, entry_ex->entry.principal);
597 if (ret) {
598 krb5_clear_error_message(context);
599 goto out;
600 }
601
602 /* While we have copied the client principal, tests
603 * show that Win2k3 returns the 'corrected' realm, not
604 * the client-specified realm. This code attempts to
605 * replace the client principal's realm with the one
606 * we determine from our records */
607
608 /* this has to be with malloc() */
609 krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
610 }
611
612 /* First try and figure out the flags based on the userAccountControl */
613 entry_ex->entry.flags = uf2HDBFlags(context, userAccountControl, ent_type);
614
615 /* Windows 2008 seems to enforce this (very sensible) rule by
616 * default - don't allow offline attacks on a user's password
617 * by asking for a ticket to them as a service (encrypted with
618 * their probably patheticly insecure password) */
619
620 if (entry_ex->entry.flags.server
621 && lpcfg_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
622 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
623 entry_ex->entry.flags.server = 0;
624 }
625 }
626
627 if (flags & HDB_F_ADMIN_DATA) {
628 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
629 * of the Heimdal KDC. They are stored in a the traditional
630 * DB for audit purposes, and still form part of the structure
631 * we must return */
632
633 /* use 'whenCreated' */
634 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
635 /* use 'kadmin' for now (needed by mit_samba) */
636 krb5_make_principal(context,
637 &entry_ex->entry.created_by.principal,
638 lpcfg_realm(lp_ctx), "kadmin", NULL);
639
640 entry_ex->entry.modified_by = (Event *) malloc(sizeof(Event));
641 if (entry_ex->entry.modified_by == NULL) {
642 ret = ENOMEM;
643 krb5_set_error_message(context, ret, "malloc: out of memory");
644 goto out;
645 }
646
647 /* use 'whenChanged' */
648 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
649 /* use 'kadmin' for now (needed by mit_samba) */
650 krb5_make_principal(context,
651 &entry_ex->entry.modified_by->principal,
652 lpcfg_realm(lp_ctx), "kadmin", NULL);
653 }
654
655
656 /* The lack of password controls etc applies to krbtgt by
657 * virtue of being that particular RID */
658 status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
659
660 if (!NT_STATUS_IS_OK(status)) {
661 ret = EINVAL;
662 goto out;
663 }
664
665 if (rid == DOMAIN_RID_KRBTGT) {
666 entry_ex->entry.valid_end = NULL;
667 entry_ex->entry.pw_end = NULL;
668
669 entry_ex->entry.flags.invalid = 0;
670 entry_ex->entry.flags.server = 1;
671
672 /* Don't mark all requests for the krbtgt/realm as
673 * 'change password', as otherwise we could get into
674 * trouble, and not enforce the password expirty.
675 * Instead, only do it when request is for the kpasswd service */
676 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER
677 && principal->name.name_string.len == 2
678 && (strcmp(principal->name.name_string.val[0], "kadmin") == 0)
679 && (strcmp(principal->name.name_string.val[1], "changepw") == 0)
680 && lpcfg_is_my_domain_or_realm(lp_ctx, principal->realm)) {
681 entry_ex->entry.flags.change_pw = 1;
682 }
683 entry_ex->entry.flags.client = 0;
684 entry_ex->entry.flags.forwardable = 1;
685 entry_ex->entry.flags.ok_as_delegate = 1;
686 } else if (is_rodc) {
687 /* The RODC krbtgt account is like the main krbtgt,
688 * but it does not have a changepw or kadmin
689 * service */
690
691 entry_ex->entry.valid_end = NULL;
692 entry_ex->entry.pw_end = NULL;
693
694 /* Also don't allow the RODC krbtgt to be a client (it should not be needed) */
695 entry_ex->entry.flags.client = 0;
696 entry_ex->entry.flags.invalid = 0;
697 entry_ex->entry.flags.server = 1;
698
699 entry_ex->entry.flags.client = 0;
700 entry_ex->entry.flags.forwardable = 1;
701 entry_ex->entry.flags.ok_as_delegate = 0;
702 } else if (entry_ex->entry.flags.server && ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
703 /* The account/password expiry only applies when the account is used as a
704 * client (ie password login), not when used as a server */
705
706 /* Make very well sure we don't use this for a client,
707 * it could bypass the password restrictions */
708 entry_ex->entry.flags.client = 0;
709
710 entry_ex->entry.valid_end = NULL;
711 entry_ex->entry.pw_end = NULL;
712
713 } else {
714 NTTIME must_change_time
715 = samdb_result_force_password_change(kdc_db_ctx->samdb, mem_ctx,
716 realm_dn, msg);
717 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
718 entry_ex->entry.pw_end = NULL;
719 } else {
720 entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
721 if (entry_ex->entry.pw_end == NULL) {
722 ret = ENOMEM;
723 goto out;
724 }
725 *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
726 }
727
728 acct_expiry = samdb_result_account_expires(msg);
729 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
730 entry_ex->entry.valid_end = NULL;
731 } else {
732 entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
733 if (entry_ex->entry.valid_end == NULL) {
734 ret = ENOMEM;
735 goto out;
736 }
737 *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
738 }
739 }
740
741 entry_ex->entry.valid_start = NULL;
742
743 entry_ex->entry.max_life = NULL;
744
745 entry_ex->entry.max_renew = NULL;
746
747 entry_ex->entry.generation = NULL;
748
749 /* Get keys from the db */
750 ret = samba_kdc_message2entry_keys(context, kdc_db_ctx, p, msg,
751 rid, is_rodc, userAccountControl,
752 ent_type, entry_ex);
753 if (ret) {
754 /* Could be bougus data in the entry, or out of memory */
755 goto out;
756 }
757
758 entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
759 if (entry_ex->entry.etypes == NULL) {
760 krb5_clear_error_message(context);
761 ret = ENOMEM;
762 goto out;
763 }
764 entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
765 entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
766 if (entry_ex->entry.etypes->val == NULL) {
767 krb5_clear_error_message(context);
768 ret = ENOMEM;
769 goto out;
770 }
771 for (i=0; i < entry_ex->entry.etypes->len; i++) {
772 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
773 }
774
775
776 p->msg = talloc_steal(p, msg);
777
778 out:
779 if (ret != 0) {
780 /* This doesn't free ent itself, that is for the eventual caller to do */
781 hdb_free_entry(context, entry_ex);
782 } else {
783 talloc_steal(kdc_db_ctx, entry_ex->ctx);
784 }
785
786 return ret;
787 }
788
789 /*
790 * Construct an hdb_entry from a directory entry.
791 */
792 static krb5_error_code samba_kdc_trust_message2entry(krb5_context context,
793 struct samba_kdc_db_context *kdc_db_ctx,
794 TALLOC_CTX *mem_ctx, krb5_const_principal principal,
795 enum trust_direction direction,
796 struct ldb_dn *realm_dn,
797 struct ldb_message *msg,
798 hdb_entry_ex *entry_ex)
799 {
800 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
801 const char *dnsdomain;
802 const char *realm = lpcfg_realm(lp_ctx);
803 DATA_BLOB password_utf16;
804 struct samr_Password password_hash;
805 const struct ldb_val *password_val;
806 struct trustAuthInOutBlob password_blob;
807 struct samba_kdc_entry *p;
808
809 enum ndr_err_code ndr_err;
810 int ret, trust_direction_flags;
811 unsigned int i;
812
813 p = talloc(mem_ctx, struct samba_kdc_entry);
814 if (!p) {
815 ret = ENOMEM;
816 goto out;
817 }
818
819 p->kdc_db_ctx = kdc_db_ctx;
820 p->entry_ex = entry_ex;
821 p->realm_dn = realm_dn;
822
823 talloc_set_destructor(p, samba_kdc_entry_destructor);
824
825 /* make sure we do not have bogus data in there */
826 memset(&entry_ex->entry, 0, sizeof(hdb_entry));
827
828 entry_ex->ctx = p;
829 entry_ex->free_entry = samba_kdc_free_entry;
830
831 /* use 'whenCreated' */
832 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
833 /* use 'kadmin' for now (needed by mit_samba) */
834 krb5_make_principal(context,
835 &entry_ex->entry.created_by.principal,
836 realm, "kadmin", NULL);
837
838 entry_ex->entry.valid_start = NULL;
839
840 trust_direction_flags = ldb_msg_find_attr_as_int(msg, "trustDirection", 0);
841
842 if (direction == INBOUND) {
843 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
844
845 } else { /* OUTBOUND */
846 dnsdomain = ldb_msg_find_attr_as_string(msg, "trustPartner", NULL);
847 /* replace realm */
848 realm = strupper_talloc(mem_ctx, dnsdomain);
849 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
850 }
851
852 if (!password_val || !(trust_direction_flags & direction)) {
853 ret = ENOENT;
854 goto out;
855 }
856
857 ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, &password_blob,
858 (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
859 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
860 ret = EINVAL;
861 goto out;
862 }
863
864 entry_ex->entry.kvno = -1;
865 for (i=0; i < password_blob.count; i++) {
866 if (password_blob.current.array[i].AuthType == TRUST_AUTH_TYPE_VERSION) {
867 entry_ex->entry.kvno = password_blob.current.array[i].AuthInfo.version.version;
868 }
869 }
870
871 for (i=0; i < password_blob.count; i++) {
872 if (password_blob.current.array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
873 password_utf16 = data_blob_const(password_blob.current.array[i].AuthInfo.clear.password,
874 password_blob.current.array[i].AuthInfo.clear.size);
875 /* In the future, generate all sorts of
876 * hashes, but for now we can't safely convert
877 * the random strings windows uses into
878 * utf8 */
879
880 /* but as it is utf16 already, we can get the NT password/arcfour-hmac-md5 key */
881 mdfour(password_hash.hash, password_utf16.data, password_utf16.length);
882 break;
883 } else if (password_blob.current.array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
884 password_hash = password_blob.current.array[i].AuthInfo.nt4owf.password;
885 break;
886 }
887 }
888
889 if (i < password_blob.count) {
890 Key key;
891 /* Must have found a cleartext or MD4 password */
892 entry_ex->entry.keys.val = calloc(1, sizeof(Key));
893
894 key.mkvno = 0;
895 key.salt = NULL; /* No salt for this enc type */
896
897 if (entry_ex->entry.keys.val == NULL) {
898 ret = ENOMEM;
899 goto out;
900 }
901
902 ret = krb5_keyblock_init(context,
903 ENCTYPE_ARCFOUR_HMAC,
904 password_hash.hash, sizeof(password_hash.hash),
905 &key.key);
906
907 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
908 entry_ex->entry.keys.len++;
909 }
910
911 entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
912
913 ret = copy_Principal(principal, entry_ex->entry.principal);
914 if (ret) {
915 krb5_clear_error_message(context);
916 goto out;
917 }
918
919 /* While we have copied the client principal, tests
920 * show that Win2k3 returns the 'corrected' realm, not
921 * the client-specified realm. This code attempts to
922 * replace the client principal's realm with the one
923 * we determine from our records */
924
925 krb5_principal_set_realm(context, entry_ex->entry.principal, realm);
926 entry_ex->entry.flags = int2HDBFlags(0);
927 entry_ex->entry.flags.immutable = 1;
928 entry_ex->entry.flags.invalid = 0;
929 entry_ex->entry.flags.server = 1;
930 entry_ex->entry.flags.require_preauth = 1;
931
932 entry_ex->entry.pw_end = NULL;
933
934 entry_ex->entry.max_life = NULL;
935
936 entry_ex->entry.max_renew = NULL;
937
938 entry_ex->entry.generation = NULL;
939
940 entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
941 if (entry_ex->entry.etypes == NULL) {
942 krb5_clear_error_message(context);
943 ret = ENOMEM;
944 goto out;
945 }
946 entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
947 entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
948 if (entry_ex->entry.etypes->val == NULL) {
949 krb5_clear_error_message(context);
950 ret = ENOMEM;
951 goto out;
952 }
953 for (i=0; i < entry_ex->entry.etypes->len; i++) {
954 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
955 }
956
957
958 p->msg = talloc_steal(p, msg);
959
960 out:
961 if (ret != 0) {
962 /* This doesn't free ent itself, that is for the eventual caller to do */
963 hdb_free_entry(context, entry_ex);
964 } else {
965 talloc_steal(kdc_db_ctx, entry_ex->ctx);
966 }
967
968 return ret;
969
970 }
971
972 static krb5_error_code samba_kdc_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
973 TALLOC_CTX *mem_ctx,
974 const char *realm,
975 struct ldb_dn *realm_dn,
976 struct ldb_message **pmsg)
977 {
978 int lret;
979 krb5_error_code ret;
980 char *filter = NULL;
981 const char * const *attrs = trust_attrs;
982
983 struct ldb_result *res = NULL;
984 filter = talloc_asprintf(mem_ctx, "(&(objectClass=trustedDomain)(|(flatname=%s)(trustPartner=%s)))", realm, realm);
985
986 if (!filter) {
987 ret = ENOMEM;
988 krb5_set_error_message(context, ret, "talloc_asprintf: out of memory");
989 return ret;
990 }
991
992 lret = ldb_search(ldb_ctx, mem_ctx, &res,
993 ldb_get_default_basedn(ldb_ctx),
994 LDB_SCOPE_SUBTREE, attrs, "%s", filter);
995 if (lret != LDB_SUCCESS) {
996 DEBUG(3, ("Failed to search for %s: %s\n", filter, ldb_errstring(ldb_ctx)));
997 return HDB_ERR_NOENTRY;
998 } else if (res->count == 0 || res->count > 1) {
999 DEBUG(3, ("Failed find a single entry for %s: got %d\n", filter, res->count));
1000 talloc_free(res);
1001 return HDB_ERR_NOENTRY;
1002 }
1003 talloc_steal(mem_ctx, res->msgs);
1004 *pmsg = res->msgs[0];
1005 talloc_free(res);
1006 return 0;
1007 }
1008
1009 static krb5_error_code samba_kdc_lookup_client(krb5_context context,
1010 struct samba_kdc_db_context *kdc_db_ctx,
1011 TALLOC_CTX *mem_ctx,
1012 krb5_const_principal principal,
1013 const char **attrs,
1014 struct ldb_dn **realm_dn,
1015 struct ldb_message **msg) {
1016 NTSTATUS nt_status;
1017 char *principal_string;
1018 krb5_error_code ret;
1019
1020 ret = krb5_unparse_name(context, principal, &principal_string);
1021
1022 if (ret != 0) {
1023 return ret;
1024 }
1025
1026 nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1027 mem_ctx, principal_string, attrs,
1028 realm_dn, msg);
1029 free(principal_string);
1030 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1031 return HDB_ERR_NOENTRY;
1032 } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1033 return ENOMEM;
1034 } else if (!NT_STATUS_IS_OK(nt_status)) {
1035 return EINVAL;
1036 }
1037
1038 return ret;
1039 }
1040
1041 static krb5_error_code samba_kdc_fetch_client(krb5_context context,
1042 struct samba_kdc_db_context *kdc_db_ctx,
1043 TALLOC_CTX *mem_ctx,
1044 krb5_const_principal principal,
1045 unsigned flags,
1046 hdb_entry_ex *entry_ex) {
1047 struct ldb_dn *realm_dn;
1048 krb5_error_code ret;
1049 struct ldb_message *msg = NULL;
1050
1051 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1052 mem_ctx, principal, user_attrs,
1053 &realm_dn, &msg);
1054 if (ret != 0) {
1055 return ret;
1056 }
1057
1058 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1059 principal, SAMBA_KDC_ENT_TYPE_CLIENT,
1060 flags,
1061 realm_dn, msg, entry_ex);
1062 return ret;
1063 }
1064
1065 static krb5_error_code samba_kdc_fetch_krbtgt(krb5_context context,
1066 struct samba_kdc_db_context *kdc_db_ctx,
1067 TALLOC_CTX *mem_ctx,
1068 krb5_const_principal principal,
1069 unsigned flags,
1070 uint32_t krbtgt_number,
1071 hdb_entry_ex *entry_ex)
1072 {
1073 struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1074 krb5_error_code ret;
1075 struct ldb_message *msg = NULL;
1076 struct ldb_dn *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1077
1078 krb5_principal alloc_principal = NULL;
1079 if (principal->name.name_string.len != 2
1080 || (strcmp(principal->name.name_string.val[0], KRB5_TGS_NAME) != 0)) {
1081 /* Not a krbtgt */
1082 return HDB_ERR_NOENTRY;
1083 }
1084
1085 /* krbtgt case. Either us or a trusted realm */
1086
1087 if (lpcfg_is_my_domain_or_realm(lp_ctx, principal->realm)
1088 && lpcfg_is_my_domain_or_realm(lp_ctx, principal->name.name_string.val[1])) {
1089 /* us, or someone quite like us */
1090 /* Cludge, cludge cludge. If the realm part of krbtgt/realm,
1091 * is in our db, then direct the caller at our primary
1092 * krbtgt */
1093
1094 int lret;
1095
1096 if (krbtgt_number == kdc_db_ctx->my_krbtgt_number) {
1097 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1098 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
1099 krbtgt_attrs, 0,
1100 "(objectClass=user)");
1101 } else {
1102 /* We need to look up an RODC krbtgt (perhaps
1103 * ours, if we are an RODC, perhaps another
1104 * RODC if we are a read-write DC */
1105 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1106 &msg, realm_dn, LDB_SCOPE_SUBTREE,
1107 krbtgt_attrs,
1108 DSDB_SEARCH_SHOW_EXTENDED_DN,
1109 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=%u))", (unsigned)(krbtgt_number));
1110 }
1111
1112 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1113 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1114 (unsigned)(krbtgt_number));
1115 krb5_set_error_message(context, HDB_ERR_NOENTRY,
1116 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1117 (unsigned)(krbtgt_number));
1118 return HDB_ERR_NOENTRY;
1119 } else if (lret != LDB_SUCCESS) {
1120 krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1121 (unsigned)(krbtgt_number));
1122 krb5_set_error_message(context, HDB_ERR_NOENTRY,
1123 "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1124 (unsigned)(krbtgt_number));
1125 return HDB_ERR_NOENTRY;
1126 }
1127
1128 if (flags & HDB_F_CANON) {
1129 ret = krb5_copy_principal(context, principal, &alloc_principal);
1130 if (ret) {
1131 return ret;
1132 }
1133
1134 /* When requested to do so, ensure that the
1135 * both realm values in the principal are set
1136 * to the upper case, canonical realm */
1137 free(alloc_principal->name.name_string.val[1]);
1138 alloc_principal->name.name_string.val[1] = strdup(lpcfg_realm(lp_ctx));
1139 if (!alloc_principal->name.name_string.val[1]) {
1140 ret = ENOMEM;
1141 krb5_set_error_message(context, ret, "samba_kdc_fetch: strdup() failed!");
1142 return ret;
1143 }
1144 principal = alloc_principal;
1145 }
1146
1147 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1148 principal, SAMBA_KDC_ENT_TYPE_KRBTGT,
1149 flags, realm_dn, msg, entry_ex);
1150 if (flags & HDB_F_CANON) {
1151 /* This is again copied in the message2entry call */
1152 krb5_free_principal(context, alloc_principal);
1153 }
1154 if (ret != 0) {
1155 krb5_warnx(context, "samba_kdc_fetch: self krbtgt message2entry failed");
1156 }
1157 return ret;
1158
1159 } else {
1160 enum trust_direction direction = UNKNOWN;
1161 const char *realm = NULL;
1162
1163 /* Either an inbound or outbound trust */
1164
1165 if (strcasecmp(lpcfg_realm(lp_ctx), principal->realm) == 0) {
1166 /* look for inbound trust */
1167 direction = INBOUND;
1168 realm = principal->name.name_string.val[1];
1169 } else if (strcasecmp(lpcfg_realm(lp_ctx), principal->name.name_string.val[1]) == 0) {
1170 /* look for outbound trust */
1171 direction = OUTBOUND;
1172 realm = principal->realm;
1173 } else {
1174 krb5_warnx(context, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1175 principal->realm, principal->name.name_string.val[1]);
1176 krb5_set_error_message(context, HDB_ERR_NOENTRY, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1177 principal->realm, principal->name.name_string.val[1]);
1178 return HDB_ERR_NOENTRY;
1179 }
1180
1181 /* Trusted domains are under CN=system */
1182
1183 ret = samba_kdc_lookup_trust(context, kdc_db_ctx->samdb,
1184 mem_ctx,
1185 realm, realm_dn, &msg);
1186
1187 if (ret != 0) {
1188 krb5_warnx(context, "samba_kdc_fetch: could not find principal in DB");
1189 krb5_set_error_message(context, ret, "samba_kdc_fetch: could not find principal in DB");
1190 return ret;
1191 }
1192
1193 ret = samba_kdc_trust_message2entry(context, kdc_db_ctx, mem_ctx,
1194 principal, direction,
1195 realm_dn, msg, entry_ex);
1196 if (ret != 0) {
1197 krb5_warnx(context, "samba_kdc_fetch: trust_message2entry failed");
1198 }
1199 return ret;
1200 }
1201
1202 }
1203
1204 static krb5_error_code samba_kdc_lookup_server(krb5_context context,
1205 struct samba_kdc_db_context *kdc_db_ctx,
1206 TALLOC_CTX *mem_ctx,
1207 krb5_const_principal principal,
1208 const char **attrs,
1209 struct ldb_dn **realm_dn,
1210 struct ldb_message **msg)
1211 {
1212 krb5_error_code ret;
1213 if (principal->name.name_string.len >= 2) {
1214 /* 'normal server' case */
1215 int ldb_ret;
1216 NTSTATUS nt_status;
1217 struct ldb_dn *user_dn;
1218 char *principal_string;
1219
1220 ret = krb5_unparse_name_flags(context, principal,
1221 KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1222 &principal_string);
1223 if (ret != 0) {
1224 return ret;
1225 }
1226
1227 /* At this point we may find the host is known to be
1228 * in a different realm, so we should generate a
1229 * referral instead */
1230 nt_status = crack_service_principal_name(kdc_db_ctx->samdb,
1231 mem_ctx, principal_string,
1232 &user_dn, realm_dn);
1233 free(principal_string);
1234
1235 if (!NT_STATUS_IS_OK(nt_status)) {
1236 return HDB_ERR_NOENTRY;
1237 }
1238
1239 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb,
1240 mem_ctx,
1241 msg, user_dn, LDB_SCOPE_BASE,
1242 attrs, DSDB_SEARCH_SHOW_EXTENDED_DN, "(objectClass=*)");
1243 if (ldb_ret != LDB_SUCCESS) {
1244 return HDB_ERR_NOENTRY;
1245 }
1246
1247 } else {
1248 int lret;
1249 char *filter = NULL;
1250 char *short_princ;
1251 const char *realm;
1252 /* server as client principal case, but we must not lookup userPrincipalNames */
1253 *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1254 realm = krb5_principal_get_realm(context, principal);
1255
1256 /* TODO: Check if it is our realm, otherwise give referall */
1257
1258 ret = krb5_unparse_name_flags(context, principal, KRB5_PRINCIPAL_UNPARSE_NO_REALM, &short_princ);
1259
1260 if (ret != 0) {
1261 krb5_set_error_message(context, ret, "samba_kdc_lookup_principal: could not parse principal");
1262 krb5_warnx(context, "samba_kdc_lookup_principal: could not parse principal");
1263 return ret;
1264 }
1265
1266 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx, msg,
1267 *realm_dn, LDB_SCOPE_SUBTREE,
1268 attrs,
1269 DSDB_SEARCH_SHOW_EXTENDED_DN,
1270 "(&(objectClass=user)(samAccountName=%s))",
1271 ldb_binary_encode_string(mem_ctx, short_princ));
1272 free(short_princ);
1273 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1274 DEBUG(3, ("Failed find a entry for %s\n", filter));
1275 return HDB_ERR_NOENTRY;
1276 }
1277 if (lret != LDB_SUCCESS) {
1278 DEBUG(3, ("Failed single search for for %s - %s\n",
1279 filter, ldb_errstring(kdc_db_ctx->samdb)));
1280 return HDB_ERR_NOENTRY;
1281 }
1282 }
1283
1284 return 0;
1285 }
1286
1287 static krb5_error_code samba_kdc_fetch_server(krb5_context context,
1288 struct samba_kdc_db_context *kdc_db_ctx,
1289 TALLOC_CTX *mem_ctx,
1290 krb5_const_principal principal,
1291 unsigned flags,
1292 hdb_entry_ex *entry_ex)
1293 {
1294 krb5_error_code ret;
1295 struct ldb_dn *realm_dn;
1296 struct ldb_message *msg;
1297
1298 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, principal,
1299 server_attrs, &realm_dn, &msg);
1300 if (ret != 0) {
1301 return ret;
1302 }
1303
1304 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1305 principal, SAMBA_KDC_ENT_TYPE_SERVER,
1306 flags,
1307 realm_dn, msg, entry_ex);
1308 if (ret != 0) {
1309 krb5_warnx(context, "samba_kdc_fetch: message2entry failed");
1310 }
1311
1312 return ret;
1313 }
1314
1315 krb5_error_code samba_kdc_fetch(krb5_context context,
1316 struct samba_kdc_db_context *kdc_db_ctx,
1317 krb5_const_principal principal,
1318 unsigned flags,
1319 krb5_kvno kvno,
1320 hdb_entry_ex *entry_ex)
1321 {
1322 krb5_error_code ret = HDB_ERR_NOENTRY;
1323 TALLOC_CTX *mem_ctx;
1324 unsigned int krbtgt_number;
1325 if (flags & HDB_F_KVNO_SPECIFIED) {
1326 krbtgt_number = kvno >> 16;
1327 if (kdc_db_ctx->rodc) {
1328 if (krbtgt_number != kdc_db_ctx->my_krbtgt_number) {
1329 return HDB_ERR_NOT_FOUND_HERE;
1330 }
1331 }
1332 } else {
1333 krbtgt_number = kdc_db_ctx->my_krbtgt_number;
1334 }
1335
1336 mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_fetch context");
1337 if (!mem_ctx) {
1338 ret = ENOMEM;
1339 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
1340 return ret;
1341 }
1342
1343 if (flags & HDB_F_GET_CLIENT) {
1344 ret = samba_kdc_fetch_client(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
1345 if (ret != HDB_ERR_NOENTRY) goto done;
1346 }
1347 if (flags & HDB_F_GET_SERVER) {
1348 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
1349 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, krbtgt_number, entry_ex);
1350 if (ret != HDB_ERR_NOENTRY) goto done;
1351
1352 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
1353 ret = samba_kdc_fetch_server(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
1354 if (ret != HDB_ERR_NOENTRY) goto done;
1355 }
1356 if (flags & HDB_F_GET_KRBTGT) {
1357 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, krbtgt_number, entry_ex);
1358 if (ret != HDB_ERR_NOENTRY) goto done;
1359 }
1360
1361 done:
1362 talloc_free(mem_ctx);
1363 return ret;
1364 }
1365
1366 struct samba_kdc_seq {
1367 unsigned int index;
1368 unsigned int count;
1369 struct ldb_message **msgs;
1370 struct ldb_dn *realm_dn;
1371 };
1372
1373 static krb5_error_code samba_kdc_seq(krb5_context context,
1374 struct samba_kdc_db_context *kdc_db_ctx,
1375 hdb_entry_ex *entry)
1376 {
1377 krb5_error_code ret;
1378 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
1379 TALLOC_CTX *mem_ctx;
1380 hdb_entry_ex entry_ex;
1381 memset(&entry_ex, '\0', sizeof(entry_ex));
1382
1383 if (!priv) {
1384 return HDB_ERR_NOENTRY;
1385 }
1386
1387 mem_ctx = talloc_named(priv, 0, "samba_kdc_seq context");
1388
1389 if (!mem_ctx) {
1390 ret = ENOMEM;
1391 krb5_set_error_message(context, ret, "samba_kdc_seq: talloc_named() failed!");
1392 return ret;
1393 }
1394
1395 if (priv->index < priv->count) {
1396 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1397 NULL, SAMBA_KDC_ENT_TYPE_ANY,
1398 HDB_F_ADMIN_DATA|HDB_F_GET_ANY,
1399 priv->realm_dn, priv->msgs[priv->index++], entry);
1400 } else {
1401 ret = HDB_ERR_NOENTRY;
1402 }
1403
1404 if (ret != 0) {
1405 TALLOC_FREE(priv);
1406 kdc_db_ctx->seq_ctx = NULL;
1407 } else {
1408 talloc_free(mem_ctx);
1409 }
1410
1411 return ret;
1412 }
1413
1414 krb5_error_code samba_kdc_firstkey(krb5_context context,
1415 struct samba_kdc_db_context *kdc_db_ctx,
1416 hdb_entry_ex *entry)
1417 {
1418 struct ldb_context *ldb_ctx = kdc_db_ctx->samdb;
1419 struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
1420 char *realm;
1421 struct ldb_result *res = NULL;
1422 krb5_error_code ret;
1423 TALLOC_CTX *mem_ctx;
1424 int lret;
1425
1426 if (priv) {
1427 TALLOC_FREE(priv);
1428 kdc_db_ctx->seq_ctx = NULL;
1429 }
1430
1431 priv = (struct samba_kdc_seq *) talloc(kdc_db_ctx, struct samba_kdc_seq);
1432 if (!priv) {
1433 ret = ENOMEM;
1434 krb5_set_error_message(context, ret, "talloc: out of memory");
1435 return ret;
1436 }
1437
1438 priv->index = 0;
1439 priv->msgs = NULL;
1440 priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
1441 priv->count = 0;
1442
1443 mem_ctx = talloc_named(priv, 0, "samba_kdc_firstkey context");
1444
1445 if (!mem_ctx) {
1446 ret = ENOMEM;
1447 krb5_set_error_message(context, ret, "samba_kdc_firstkey: talloc_named() failed!");
1448 return ret;
1449 }
1450
1451 ret = krb5_get_default_realm(context, &realm);
1452 if (ret != 0) {
1453 TALLOC_FREE(priv);
1454 return ret;
1455 }
1456
1457 lret = ldb_search(ldb_ctx, priv, &res,
1458 priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
1459 "(objectClass=user)");
1460
1461 if (lret != LDB_SUCCESS) {
1462 TALLOC_FREE(priv);
1463 return HDB_ERR_NOENTRY;
1464 }
1465
1466 priv->count = res->count;
1467 priv->msgs = talloc_steal(priv, res->msgs);
1468 talloc_free(res);
1469
1470 kdc_db_ctx->seq_ctx = priv;
1471
1472 ret = samba_kdc_seq(context, kdc_db_ctx, entry);
1473
1474 if (ret != 0) {
1475 TALLOC_FREE(priv);
1476 kdc_db_ctx->seq_ctx = NULL;
1477 } else {
1478 talloc_free(mem_ctx);
1479 }
1480 return ret;
1481 }
1482
1483 krb5_error_code samba_kdc_nextkey(krb5_context context,
1484 struct samba_kdc_db_context *kdc_db_ctx,
1485 hdb_entry_ex *entry)
1486 {
1487 return samba_kdc_seq(context, kdc_db_ctx, entry);
1488 }
1489
1490 /* Check if a given entry may delegate or do s4u2self to this target principal
1491 *
1492 * This is currently a very nasty hack - allowing only delegation to itself.
1493 *
1494 * This is shared between the constrained delegation and S4U2Self code.
1495 */
1496 krb5_error_code
1497 samba_kdc_check_identical_client_and_server(krb5_context context,
1498 struct samba_kdc_db_context *kdc_db_ctx,
1499 hdb_entry_ex *entry,
1500 krb5_const_principal target_principal)
1501 {
1502 krb5_error_code ret;
1503 krb5_principal enterprise_prinicpal = NULL;
1504 struct ldb_dn *realm_dn;
1505 struct ldb_message *msg;
1506 struct dom_sid *orig_sid;
1507 struct dom_sid *target_sid;
1508 struct samba_kdc_entry *p = talloc_get_type(entry->ctx, struct samba_kdc_entry);
1509 const char *delegation_check_attrs[] = {
1510 "objectSid", NULL
1511 };
1512
1513 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_constrained_delegation");
1514
1515 if (!mem_ctx) {
1516 ret = ENOMEM;
1517 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
1518 return ret;
1519 }
1520
1521 if (target_principal->name.name_type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1522 /* Need to reparse the enterprise principal to find the real target */
1523 if (target_principal->name.name_string.len != 1) {
1524 ret = KRB5_PARSE_MALFORMED;
1525 krb5_set_error_message(context, ret, "samba_kdc_check_constrained_delegation: request for delegation to enterprise principal with wrong (%d) number of components",
1526 target_principal->name.name_string.len);
1527 talloc_free(mem_ctx);
1528 return ret;
1529 }
1530 ret = krb5_parse_name(context, target_principal->name.name_string.val[0],
1531 &enterprise_prinicpal);
1532 if (ret) {
1533 talloc_free(mem_ctx);
1534 return ret;
1535 }
1536 target_principal = enterprise_prinicpal;
1537 }
1538
1539 ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, target_principal,
1540 delegation_check_attrs, &realm_dn, &msg);
1541
1542 krb5_free_principal(context, enterprise_prinicpal);
1543
1544 if (ret != 0) {
1545 talloc_free(mem_ctx);
1546 return ret;
1547 }
1548
1549 orig_sid = samdb_result_dom_sid(mem_ctx, p->msg, "objectSid");
1550 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
1551
1552 /* Allow delegation to the same principal, even if by a different
1553 * name. The easy and safe way to prove this is by SID
1554 * comparison */
1555 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
1556 talloc_free(mem_ctx);
1557 return KRB5KDC_ERR_BADOPTION;
1558 }
1559
1560 talloc_free(mem_ctx);
1561 return ret;
1562 }
1563
1564 /* Certificates printed by a the Certificate Authority might have a
1565 * slightly different form of the user principal name to that in the
1566 * database. Allow a mismatch where they both refer to the same
1567 * SID */
1568
1569 krb5_error_code
1570 samba_kdc_check_pkinit_ms_upn_match(krb5_context context,
1571 struct samba_kdc_db_context *kdc_db_ctx,
1572 hdb_entry_ex *entry,
1573 krb5_const_principal certificate_principal)
1574 {
1575 krb5_error_code ret;
1576 struct ldb_dn *realm_dn;
1577 struct ldb_message *msg;
1578 struct dom_sid *orig_sid;
1579 struct dom_sid *target_sid;
1580 struct samba_kdc_entry *p = talloc_get_type(entry->ctx, struct samba_kdc_entry);
1581 const char *ms_upn_check_attrs[] = {
1582 "objectSid", NULL
1583 };
1584
1585 TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_pkinit_ms_upn_match");
1586
1587 if (!mem_ctx) {
1588 ret = ENOMEM;
1589 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
1590 return ret;
1591 }
1592
1593 ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1594 mem_ctx, certificate_principal,
1595 ms_upn_check_attrs, &realm_dn, &msg);
1596
1597 if (ret != 0) {
1598 talloc_free(mem_ctx);
1599 return ret;
1600 }
1601
1602 orig_sid = samdb_result_dom_sid(mem_ctx, p->msg, "objectSid");
1603 target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
1604
1605 /* Consider these to be the same principal, even if by a different
1606 * name. The easy and safe way to prove this is by SID
1607 * comparison */
1608 if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
1609 talloc_free(mem_ctx);
1610 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1611 }
1612
1613 talloc_free(mem_ctx);
1614 return ret;
1615 }
1616
1617 NTSTATUS samba_kdc_setup_db_ctx(TALLOC_CTX *mem_ctx, struct samba_kdc_base_context *base_ctx,
1618 struct samba_kdc_db_context **kdc_db_ctx_out)
1619 {
1620 int ldb_ret;
1621 struct ldb_message *msg;
1622 struct auth_session_info *session_info;
1623 struct samba_kdc_db_context *kdc_db_ctx;
1624 /* The idea here is very simple. Using Kerberos to
1625 * authenticate the KDC to the LDAP server is higly likely to
1626 * be circular.
1627 *
1628 * In future we may set this up to use EXERNAL and SSL
1629 * certificates, for now it will almost certainly be NTLMSSP_SET_USERNAME
1630 */
1631
1632 kdc_db_ctx = talloc_zero(mem_ctx, struct samba_kdc_db_context);
1633 if (kdc_db_ctx == NULL) {
1634 return NT_STATUS_NO_MEMORY;
1635 }
1636 kdc_db_ctx->ev_ctx = base_ctx->ev_ctx;
1637 kdc_db_ctx->lp_ctx = base_ctx->lp_ctx;
1638
1639 session_info = system_session(kdc_db_ctx->lp_ctx);
1640 if (session_info == NULL) {
1641 return NT_STATUS_INTERNAL_ERROR;
1642 }
1643
1644 /* Setup the link to LDB */
1645 kdc_db_ctx->samdb = samdb_connect(kdc_db_ctx, base_ctx->ev_ctx,
1646 base_ctx->lp_ctx, session_info, 0);
1647 if (kdc_db_ctx->samdb == NULL) {
1648 DEBUG(1, ("hdb_samba4_create: Cannot open samdb for KDC backend!"));
1649 talloc_free(kdc_db_ctx);
1650 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1651 }
1652
1653 /* Find out our own krbtgt kvno */
1654 ldb_ret = samdb_rodc(kdc_db_ctx->samdb, &kdc_db_ctx->rodc);
1655 if (ldb_ret != LDB_SUCCESS) {
1656 DEBUG(1, ("hdb_samba4_create: Cannot determine if we are an RODC in KDC backend: %s\n",
1657 ldb_errstring(kdc_db_ctx->samdb)));
1658 talloc_free(kdc_db_ctx);
1659 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1660 }
1661 if (kdc_db_ctx->rodc) {
1662 int my_krbtgt_number;
1663 const char *secondary_keytab[] = { "msDS-SecondaryKrbTgtNumber", NULL };
1664 struct ldb_dn *account_dn;
1665 struct ldb_dn *server_dn = samdb_server_dn(kdc_db_ctx->samdb, kdc_db_ctx);
1666 if (!server_dn) {
1667 DEBUG(1, ("hdb_samba4_create: Cannot determine server DN in KDC backend: %s\n",
1668 ldb_errstring(kdc_db_ctx->samdb)));
1669 talloc_free(kdc_db_ctx);
1670 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1671 }
1672
1673 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, server_dn,
1674 "serverReference", &account_dn);
1675 if (ldb_ret != LDB_SUCCESS) {
1676 DEBUG(1, ("hdb_samba4_create: Cannot determine server account in KDC backend: %s\n",
1677 ldb_errstring(kdc_db_ctx->samdb)));
1678 talloc_free(kdc_db_ctx);
1679 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1680 }
1681
1682 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, account_dn,
1683 "msDS-KrbTgtLink", &kdc_db_ctx->krbtgt_dn);
1684 talloc_free(account_dn);
1685 if (ldb_ret != LDB_SUCCESS) {
1686 DEBUG(1, ("hdb_samba4_create: Cannot determine RODC krbtgt account in KDC backend: %s\n",
1687 ldb_errstring(kdc_db_ctx->samdb)));
1688 talloc_free(kdc_db_ctx);
1689 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1690 }
1691
1692 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
1693 &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
1694 secondary_keytab,
1695 0,
1696 "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=*))");
1697 if (ldb_ret != LDB_SUCCESS) {
1698 DEBUG(1, ("hdb_samba4_create: Cannot read krbtgt account %s in KDC backend to get msDS-SecondaryKrbTgtNumber: %s: %s\n",
1699 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
1700 ldb_errstring(kdc_db_ctx->samdb),
1701 ldb_strerror(ldb_ret)));
1702 talloc_free(kdc_db_ctx);
1703 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1704 }
1705 my_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
1706 if (my_krbtgt_number == -1) {
1707 DEBUG(1, ("hdb_samba4_create: Cannot read msDS-SecondaryKrbTgtNumber from krbtgt account %s in KDC backend: got %d\n",
1708 ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
1709 my_krbtgt_number));
1710 talloc_free(kdc_db_ctx);
1711 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1712 }
1713 kdc_db_ctx->my_krbtgt_number = my_krbtgt_number;
1714
1715 } else {
1716 kdc_db_ctx->my_krbtgt_number = 0;
1717 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
1718 &msg, NULL, LDB_SCOPE_SUBTREE,
1719 krbtgt_attrs,
1720 DSDB_SEARCH_SHOW_EXTENDED_DN,
1721 "(&(objectClass=user)(samAccountName=krbtgt))");
1722
1723 if (ldb_ret != LDB_SUCCESS) {
1724 DEBUG(1, ("samba_kdc_fetch: could not find own KRBTGT in DB: %s\n", ldb_errstring(kdc_db_ctx->samdb)));
1725 talloc_free(kdc_db_ctx);
1726 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1727 }
1728 kdc_db_ctx->krbtgt_dn = talloc_steal(kdc_db_ctx, msg->dn);
1729 kdc_db_ctx->my_krbtgt_number = 0;
1730 talloc_free(msg);
1731 }
1732 *kdc_db_ctx_out = kdc_db_ctx;
1733 return NT_STATUS_OK;
1734 }
reg import