72262ac18b57234a254becaf276c4a0badcc4f77
[kai/samba.git] / source4 / kdc / db-glue.c
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 <hdb.h>
36 #include "kdc/samba_kdc.h"
37 #include "kdc/kdc-glue.h"
38 #include "kdc/kdc-policy.h"
39 #include "kdc/db-glue.h"
40
41 #define SAMBA_KVNO_GET_KRBTGT(kvno) \
42         ((uint16_t)(((uint32_t)kvno) >> 16))
43
44 #define SAMBA_KVNO_AND_KRBTGT(kvno, krbtgt) \
45         ((krb5_kvno)((((uint32_t)kvno) & 0xFFFF) | \
46          ((((uint32_t)krbtgt) << 16) & 0xFFFF0000)))
47
48 enum samba_kdc_ent_type
49 { SAMBA_KDC_ENT_TYPE_CLIENT, SAMBA_KDC_ENT_TYPE_SERVER,
50   SAMBA_KDC_ENT_TYPE_KRBTGT, SAMBA_KDC_ENT_TYPE_TRUST, SAMBA_KDC_ENT_TYPE_ANY };
51
52 enum trust_direction {
53         UNKNOWN = 0,
54         INBOUND = LSA_TRUST_DIRECTION_INBOUND,
55         OUTBOUND = LSA_TRUST_DIRECTION_OUTBOUND
56 };
57
58 static const char *trust_attrs[] = {
59         "trustPartner",
60         "trustAuthIncoming",
61         "trustAuthOutgoing",
62         "whenCreated",
63         "msDS-SupportedEncryptionTypes",
64         "trustAttributes",
65         "trustDirection",
66         "trustType",
67         NULL
68 };
69
70 static KerberosTime ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, KerberosTime default_val)
71 {
72     const char *tmp;
73     const char *gentime;
74     struct tm tm;
75
76     gentime = ldb_msg_find_attr_as_string(msg, attr, NULL);
77     if (!gentime)
78         return default_val;
79
80     tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
81     if (tmp == NULL) {
82             return default_val;
83     }
84
85     return timegm(&tm);
86 }
87
88 static HDBFlags uf2HDBFlags(krb5_context context, uint32_t userAccountControl, enum samba_kdc_ent_type ent_type)
89 {
90         HDBFlags flags = int2HDBFlags(0);
91
92         /* we don't allow kadmin deletes */
93         flags.immutable = 1;
94
95         /* mark the principal as invalid to start with */
96         flags.invalid = 1;
97
98         flags.renewable = 1;
99
100         /* All accounts are servers, but this may be disabled again in the caller */
101         flags.server = 1;
102
103         /* Account types - clear the invalid bit if it turns out to be valid */
104         if (userAccountControl & UF_NORMAL_ACCOUNT) {
105                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
106                         flags.client = 1;
107                 }
108                 flags.invalid = 0;
109         }
110
111         if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
112                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
113                         flags.client = 1;
114                 }
115                 flags.invalid = 0;
116         }
117         if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
118                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
119                         flags.client = 1;
120                 }
121                 flags.invalid = 0;
122         }
123         if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
124                 if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT || ent_type == SAMBA_KDC_ENT_TYPE_ANY) {
125                         flags.client = 1;
126                 }
127                 flags.invalid = 0;
128         }
129
130         /* Not permitted to act as a client if disabled */
131         if (userAccountControl & UF_ACCOUNTDISABLE) {
132                 flags.client = 0;
133         }
134         if (userAccountControl & UF_LOCKOUT) {
135                 flags.invalid = 1;
136         }
137 /*
138         if (userAccountControl & UF_PASSWORD_NOTREQD) {
139                 flags.invalid = 1;
140         }
141 */
142 /*
143         UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent
144 */
145         if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
146                 flags.invalid = 1;
147         }
148
149 /* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in samba_kdc_message2entry() */
150
151 /*
152         if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
153                 flags.invalid = 1;
154         }
155 */
156         if (userAccountControl & UF_SMARTCARD_REQUIRED) {
157                 flags.require_hwauth = 1;
158         }
159         if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) {
160                 flags.ok_as_delegate = 1;
161         }
162         if (userAccountControl & UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION) {
163                 /*
164                  * this is confusing...
165                  *
166                  * UF_TRUSTED_FOR_DELEGATION
167                  * => ok_as_delegate
168                  *
169                  * and
170                  *
171                  * UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION
172                  * => trusted_for_delegation
173                  */
174                 flags.trusted_for_delegation = 1;
175         }
176         if (!(userAccountControl & UF_NOT_DELEGATED)) {
177                 flags.forwardable = 1;
178                 flags.proxiable = 1;
179         }
180
181         if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
182                 flags.require_preauth = 0;
183         } else {
184                 flags.require_preauth = 1;
185
186         }
187         return flags;
188 }
189
190 static int samba_kdc_entry_destructor(struct samba_kdc_entry *p)
191 {
192     hdb_entry_ex *entry_ex = p->entry_ex;
193     free_hdb_entry(&entry_ex->entry);
194     return 0;
195 }
196
197 static void samba_kdc_free_entry(krb5_context context, hdb_entry_ex *entry_ex)
198 {
199         /* this function is called only from hdb_free_entry().
200          * Make sure we neutralize the destructor or we will
201          * get a double free later when hdb_free_entry() will
202          * try to call free_hdb_entry() */
203         talloc_set_destructor(entry_ex->ctx, NULL);
204
205         /* now proceed to free the talloc part */
206         talloc_free(entry_ex->ctx);
207 }
208
209 static krb5_error_code samba_kdc_message2entry_keys(krb5_context context,
210                                                     struct samba_kdc_db_context *kdc_db_ctx,
211                                                     TALLOC_CTX *mem_ctx,
212                                                     struct ldb_message *msg,
213                                                     uint32_t rid,
214                                                     bool is_rodc,
215                                                     uint32_t userAccountControl,
216                                                     enum samba_kdc_ent_type ent_type,
217                                                     hdb_entry_ex *entry_ex)
218 {
219         krb5_error_code ret = 0;
220         enum ndr_err_code ndr_err;
221         struct samr_Password *hash;
222         const struct ldb_val *sc_val;
223         struct supplementalCredentialsBlob scb;
224         struct supplementalCredentialsPackage *scpk = NULL;
225         bool newer_keys = false;
226         struct package_PrimaryKerberosBlob _pkb;
227         struct package_PrimaryKerberosCtr3 *pkb3 = NULL;
228         struct package_PrimaryKerberosCtr4 *pkb4 = NULL;
229         uint16_t i;
230         uint16_t allocated_keys = 0;
231         int rodc_krbtgt_number = 0;
232         int kvno = 0;
233         uint32_t supported_enctypes
234                 = ldb_msg_find_attr_as_uint(msg,
235                                             "msDS-SupportedEncryptionTypes",
236                                             0);
237
238         if (rid == DOMAIN_RID_KRBTGT || is_rodc) {
239                 /* KDCs (and KDCs on RODCs) use AES */
240                 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
241         } else if (userAccountControl & (UF_PARTIAL_SECRETS_ACCOUNT|UF_SERVER_TRUST_ACCOUNT)) {
242                 /* DCs and RODCs comptuer accounts use AES */
243                 supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256;
244         } else if (ent_type == SAMBA_KDC_ENT_TYPE_CLIENT ||
245                    (ent_type == SAMBA_KDC_ENT_TYPE_ANY)) {
246                 /* for AS-REQ the client chooses the enc types it
247                  * supports, and this will vary between computers a
248                  * user logs in from.
249                  *
250                  * likewise for 'any' return as much as is supported,
251                  * to export into a keytab */
252                 supported_enctypes = ENC_ALL_TYPES;
253         }
254
255         /* If UF_USE_DES_KEY_ONLY has been set, then don't allow use of the newer enc types */
256         if (userAccountControl & UF_USE_DES_KEY_ONLY) {
257                 supported_enctypes = ENC_CRC32|ENC_RSA_MD5;
258         } else {
259                 /* Otherwise, add in the default enc types */
260                 supported_enctypes |= ENC_CRC32 | ENC_RSA_MD5 | ENC_RC4_HMAC_MD5;
261         }
262
263         /* Is this the krbtgt or a RODC krbtgt */
264         if (is_rodc) {
265                 rodc_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
266
267                 if (rodc_krbtgt_number == -1) {
268                         return EINVAL;
269                 }
270         }
271
272         entry_ex->entry.keys.val = NULL;
273         entry_ex->entry.keys.len = 0;
274
275         kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
276         if (is_rodc) {
277                 kvno = SAMBA_KVNO_AND_KRBTGT(kvno, rodc_krbtgt_number);
278         }
279         entry_ex->entry.kvno = kvno;
280
281         /* Get keys from the db */
282
283         hash = samdb_result_hash(mem_ctx, msg, "unicodePwd");
284         sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
285
286         /* unicodePwd for enctype 0x17 (23) if present */
287         if (hash) {
288                 allocated_keys++;
289         }
290
291         /* supplementalCredentials if present */
292         if (sc_val) {
293                 ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, &scb,
294                                                    (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob);
295                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
296                         dump_data(0, sc_val->data, sc_val->length);
297                         ret = EINVAL;
298                         goto out;
299                 }
300
301                 if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) {
302                         NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb);
303                         ret = EINVAL;
304                         goto out;
305                 }
306
307                 for (i=0; i < scb.sub.num_packages; i++) {
308                         if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) {
309                                 scpk = &scb.sub.packages[i];
310                                 if (!scpk->data || !scpk->data[0]) {
311                                         scpk = NULL;
312                                         continue;
313                                 }
314                                 newer_keys = true;
315                                 break;
316                         } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) {
317                                 scpk = &scb.sub.packages[i];
318                                 if (!scpk->data || !scpk->data[0]) {
319                                         scpk = NULL;
320                                 }
321                                 /*
322                                  * we don't break here in hope to find
323                                  * a Kerberos-Newer-Keys package
324                                  */
325                         }
326                 }
327         }
328         /*
329          * Primary:Kerberos-Newer-Keys or Primary:Kerberos element
330          * of supplementalCredentials
331          */
332         if (scpk) {
333                 DATA_BLOB blob;
334
335                 blob = strhex_to_data_blob(mem_ctx, scpk->data);
336                 if (!blob.data) {
337                         ret = ENOMEM;
338                         goto out;
339                 }
340
341                 /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */
342                 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &_pkb,
343                                                (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob);
344                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
345                         ret = EINVAL;
346                         krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
347                         krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse package_PrimaryKerberosBlob");
348                         goto out;
349                 }
350
351                 if (newer_keys && _pkb.version != 4) {
352                         ret = EINVAL;
353                         krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
354                         krb5_warnx(context, "samba_kdc_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4");
355                         goto out;
356                 }
357
358                 if (!newer_keys && _pkb.version != 3) {
359                         ret = EINVAL;
360                         krb5_set_error_message(context, ret, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
361                         krb5_warnx(context, "samba_kdc_message2entry_keys: could not parse Primary:Kerberos not version 3");
362                         goto out;
363                 }
364
365                 if (_pkb.version == 4) {
366                         pkb4 = &_pkb.ctr.ctr4;
367                         allocated_keys += pkb4->num_keys;
368                 } else if (_pkb.version == 3) {
369                         pkb3 = &_pkb.ctr.ctr3;
370                         allocated_keys += pkb3->num_keys;
371                 }
372         }
373
374         if (allocated_keys == 0) {
375                 if (kdc_db_ctx->rodc) {
376                         /* We are on an RODC, but don't have keys for this account.  Signal this to the caller */
377                         return HDB_ERR_NOT_FOUND_HERE;
378                 }
379
380                 /* oh, no password.  Apparently (comment in
381                  * hdb-ldap.c) this violates the ASN.1, but this
382                  * allows an entry with no keys (yet). */
383                 return 0;
384         }
385
386         /* allocate space to decode into */
387         entry_ex->entry.keys.len = 0;
388         entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(Key));
389         if (entry_ex->entry.keys.val == NULL) {
390                 ret = ENOMEM;
391                 goto out;
392         }
393
394         if (hash && (supported_enctypes & ENC_RC4_HMAC_MD5)) {
395                 Key key;
396
397                 key.mkvno = 0;
398                 key.salt = NULL; /* No salt for this enc type */
399
400                 ret = krb5_keyblock_init(context,
401                                          ENCTYPE_ARCFOUR_HMAC,
402                                          hash->hash, sizeof(hash->hash),
403                                          &key.key);
404                 if (ret) {
405                         goto out;
406                 }
407
408                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
409                 entry_ex->entry.keys.len++;
410         }
411
412         if (pkb4) {
413                 for (i=0; i < pkb4->num_keys; i++) {
414                         Key key;
415
416                         if (!pkb4->keys[i].value) continue;
417
418                         if (!(kerberos_enctype_to_bitmap(pkb4->keys[i].keytype) & supported_enctypes)) {
419                                 continue;
420                         }
421
422                         key.mkvno = 0;
423                         key.salt = NULL;
424
425                         if (pkb4->salt.string) {
426                                 DATA_BLOB salt;
427
428                                 salt = data_blob_string_const(pkb4->salt.string);
429
430                                 key.salt = calloc(1, sizeof(*key.salt));
431                                 if (key.salt == NULL) {
432                                         ret = ENOMEM;
433                                         goto out;
434                                 }
435
436                                 key.salt->type = hdb_pw_salt;
437
438                                 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
439                                 if (ret) {
440                                         free(key.salt);
441                                         key.salt = NULL;
442                                         goto out;
443                                 }
444                         }
445
446                         /* TODO: maybe pass the iteration_count somehow... */
447
448                         ret = krb5_keyblock_init(context,
449                                                  pkb4->keys[i].keytype,
450                                                  pkb4->keys[i].value->data,
451                                                  pkb4->keys[i].value->length,
452                                                  &key.key);
453                         if (ret == KRB5_PROG_ETYPE_NOSUPP) {
454                                 DEBUG(2,("Unsupported keytype ignored - type %u\n",
455                                          pkb4->keys[i].keytype));
456                                 ret = 0;
457                                 continue;
458                         }
459                         if (ret) {
460                                 if (key.salt) {
461                                         free_Salt(key.salt);
462                                         free(key.salt);
463                                         key.salt = NULL;
464                                 }
465                                 goto out;
466                         }
467
468                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
469                         entry_ex->entry.keys.len++;
470                 }
471         } else if (pkb3) {
472                 for (i=0; i < pkb3->num_keys; i++) {
473                         Key key;
474
475                         if (!pkb3->keys[i].value) continue;
476
477                         if (!(kerberos_enctype_to_bitmap(pkb3->keys[i].keytype) & supported_enctypes)) {
478                                 continue;
479                         }
480
481                         key.mkvno = 0;
482                         key.salt = NULL;
483
484                         if (pkb3->salt.string) {
485                                 DATA_BLOB salt;
486
487                                 salt = data_blob_string_const(pkb3->salt.string);
488
489                                 key.salt = calloc(1, sizeof(*key.salt));
490                                 if (key.salt == NULL) {
491                                         ret = ENOMEM;
492                                         goto out;
493                                 }
494
495                                 key.salt->type = hdb_pw_salt;
496
497                                 ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length);
498                                 if (ret) {
499                                         free(key.salt);
500                                         key.salt = NULL;
501                                         goto out;
502                                 }
503                         }
504
505                         ret = krb5_keyblock_init(context,
506                                                  pkb3->keys[i].keytype,
507                                                  pkb3->keys[i].value->data,
508                                                  pkb3->keys[i].value->length,
509                                                  &key.key);
510                         if (ret) {
511                                 if (key.salt) {
512                                         free_Salt(key.salt);
513                                         free(key.salt);
514                                         key.salt = NULL;
515                                 }
516                                 goto out;
517                         }
518
519                         entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
520                         entry_ex->entry.keys.len++;
521                 }
522         }
523
524 out:
525         if (ret != 0) {
526                 entry_ex->entry.keys.len = 0;
527         }
528         if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) {
529                 free(entry_ex->entry.keys.val);
530                 entry_ex->entry.keys.val = NULL;
531         }
532         return ret;
533 }
534
535 /*
536  * Construct an hdb_entry from a directory entry.
537  */
538 static krb5_error_code samba_kdc_message2entry(krb5_context context,
539                                                struct samba_kdc_db_context *kdc_db_ctx,
540                                                TALLOC_CTX *mem_ctx, krb5_const_principal principal,
541                                                enum samba_kdc_ent_type ent_type,
542                                                unsigned flags,
543                                                struct ldb_dn *realm_dn,
544                                                struct ldb_message *msg,
545                                                hdb_entry_ex *entry_ex)
546 {
547         struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
548         uint32_t userAccountControl;
549         unsigned int i;
550         krb5_error_code ret = 0;
551         krb5_boolean is_computer = FALSE;
552
553         struct samba_kdc_entry *p;
554         NTTIME acct_expiry;
555         NTSTATUS status;
556
557         uint32_t rid;
558         bool is_rodc = false;
559         struct ldb_message_element *objectclasses;
560         struct ldb_val computer_val;
561         const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
562         computer_val.data = discard_const_p(uint8_t,"computer");
563         computer_val.length = strlen((const char *)computer_val.data);
564
565         if (ldb_msg_find_element(msg, "msDS-SecondaryKrbTgtNumber")) {
566                 is_rodc = true;
567         }
568
569         if (!samAccountName) {
570                 ret = ENOENT;
571                 krb5_set_error_message(context, ret, "samba_kdc_message2entry: no samAccountName present");
572                 goto out;
573         }
574
575         objectclasses = ldb_msg_find_element(msg, "objectClass");
576
577         if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
578                 is_computer = TRUE;
579         }
580
581         memset(entry_ex, 0, sizeof(*entry_ex));
582
583         p = talloc(mem_ctx, struct samba_kdc_entry);
584         if (!p) {
585                 ret = ENOMEM;
586                 goto out;
587         }
588
589         p->kdc_db_ctx = kdc_db_ctx;
590         p->entry_ex = entry_ex;
591         p->realm_dn = talloc_reference(p, realm_dn);
592         if (!p->realm_dn) {
593                 ret = ENOMEM;
594                 goto out;
595         }
596
597         talloc_set_destructor(p, samba_kdc_entry_destructor);
598
599         /* make sure we do not have bogus data in there */
600         memset(&entry_ex->entry, 0, sizeof(hdb_entry));
601
602         entry_ex->ctx = p;
603         entry_ex->free_entry = samba_kdc_free_entry;
604
605         userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
606
607
608         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
609         if (ent_type == SAMBA_KDC_ENT_TYPE_ANY && principal == NULL) {
610                 krb5_make_principal(context, &entry_ex->entry.principal, lpcfg_realm(lp_ctx), samAccountName, NULL);
611         } else {
612                 ret = copy_Principal(principal, entry_ex->entry.principal);
613                 if (ret) {
614                         krb5_clear_error_message(context);
615                         goto out;
616                 }
617
618                 /* While we have copied the client principal, tests
619                  * show that Win2k3 returns the 'corrected' realm, not
620                  * the client-specified realm.  This code attempts to
621                  * replace the client principal's realm with the one
622                  * we determine from our records */
623
624                 /* this has to be with malloc() */
625                 krb5_principal_set_realm(context, entry_ex->entry.principal, lpcfg_realm(lp_ctx));
626         }
627
628         /* First try and figure out the flags based on the userAccountControl */
629         entry_ex->entry.flags = uf2HDBFlags(context, userAccountControl, ent_type);
630
631         /* Windows 2008 seems to enforce this (very sensible) rule by
632          * default - don't allow offline attacks on a user's password
633          * by asking for a ticket to them as a service (encrypted with
634          * their probably patheticly insecure password) */
635
636         if (entry_ex->entry.flags.server
637             && lpcfg_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) {
638                 if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) {
639                         entry_ex->entry.flags.server = 0;
640                 }
641         }
642
643         if (flags & HDB_F_ADMIN_DATA) {
644                 /* These (created_by, modified_by) parts of the entry are not relevant for Samba4's use
645                  * of the Heimdal KDC.  They are stored in a the traditional
646                  * DB for audit purposes, and still form part of the structure
647                  * we must return */
648
649                 /* use 'whenCreated' */
650                 entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
651                 /* use 'kadmin' for now (needed by mit_samba) */
652                 krb5_make_principal(context,
653                                     &entry_ex->entry.created_by.principal,
654                                     lpcfg_realm(lp_ctx), "kadmin", NULL);
655
656                 entry_ex->entry.modified_by = (Event *) malloc(sizeof(Event));
657                 if (entry_ex->entry.modified_by == NULL) {
658                         ret = ENOMEM;
659                         krb5_set_error_message(context, ret, "malloc: out of memory");
660                         goto out;
661                 }
662
663                 /* use 'whenChanged' */
664                 entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
665                 /* use 'kadmin' for now (needed by mit_samba) */
666                 krb5_make_principal(context,
667                                     &entry_ex->entry.modified_by->principal,
668                                     lpcfg_realm(lp_ctx), "kadmin", NULL);
669         }
670
671
672         /* The lack of password controls etc applies to krbtgt by
673          * virtue of being that particular RID */
674         status = dom_sid_split_rid(NULL, samdb_result_dom_sid(mem_ctx, msg, "objectSid"), NULL, &rid);
675
676         if (!NT_STATUS_IS_OK(status)) {
677                 ret = EINVAL;
678                 goto out;
679         }
680
681         if (rid == DOMAIN_RID_KRBTGT) {
682                 entry_ex->entry.valid_end = NULL;
683                 entry_ex->entry.pw_end = NULL;
684
685                 entry_ex->entry.flags.invalid = 0;
686                 entry_ex->entry.flags.server = 1;
687
688                 /* Don't mark all requests for the krbtgt/realm as
689                  * 'change password', as otherwise we could get into
690                  * trouble, and not enforce the password expirty.
691                  * Instead, only do it when request is for the kpasswd service */
692                 if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER
693                     && principal->name.name_string.len == 2
694                     && (strcmp(principal->name.name_string.val[0], "kadmin") == 0)
695                     && (strcmp(principal->name.name_string.val[1], "changepw") == 0)
696                     && lpcfg_is_my_domain_or_realm(lp_ctx, principal->realm)) {
697                         entry_ex->entry.flags.change_pw = 1;
698                 }
699                 entry_ex->entry.flags.client = 0;
700                 entry_ex->entry.flags.forwardable = 1;
701                 entry_ex->entry.flags.ok_as_delegate = 1;
702         } else if (is_rodc) {
703                 /* The RODC krbtgt account is like the main krbtgt,
704                  * but it does not have a changepw or kadmin
705                  * service */
706
707                 entry_ex->entry.valid_end = NULL;
708                 entry_ex->entry.pw_end = NULL;
709
710                 /* Also don't allow the RODC krbtgt to be a client (it should not be needed) */
711                 entry_ex->entry.flags.client = 0;
712                 entry_ex->entry.flags.invalid = 0;
713                 entry_ex->entry.flags.server = 1;
714
715                 entry_ex->entry.flags.client = 0;
716                 entry_ex->entry.flags.forwardable = 1;
717                 entry_ex->entry.flags.ok_as_delegate = 0;
718         } else if (entry_ex->entry.flags.server && ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
719                 /* The account/password expiry only applies when the account is used as a
720                  * client (ie password login), not when used as a server */
721
722                 /* Make very well sure we don't use this for a client,
723                  * it could bypass the password restrictions */
724                 entry_ex->entry.flags.client = 0;
725
726                 entry_ex->entry.valid_end = NULL;
727                 entry_ex->entry.pw_end = NULL;
728
729         } else {
730                 NTTIME must_change_time
731                         = samdb_result_force_password_change(kdc_db_ctx->samdb, mem_ctx,
732                                                              realm_dn, msg);
733                 if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) {
734                         entry_ex->entry.pw_end = NULL;
735                 } else {
736                         entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end));
737                         if (entry_ex->entry.pw_end == NULL) {
738                                 ret = ENOMEM;
739                                 goto out;
740                         }
741                         *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time);
742                 }
743
744                 acct_expiry = samdb_result_account_expires(msg);
745                 if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) {
746                         entry_ex->entry.valid_end = NULL;
747                 } else {
748                         entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end));
749                         if (entry_ex->entry.valid_end == NULL) {
750                                 ret = ENOMEM;
751                                 goto out;
752                         }
753                         *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry);
754                 }
755         }
756
757         entry_ex->entry.valid_start = NULL;
758
759         entry_ex->entry.max_life = malloc(sizeof(*entry_ex->entry.max_life));
760         if (entry_ex->entry.max_life == NULL) {
761                 ret = ENOMEM;
762                 goto out;
763         }
764
765         if (ent_type == SAMBA_KDC_ENT_TYPE_SERVER) {
766                 *entry_ex->entry.max_life = nt_time_to_unix(kdc_db_ctx->policy.service_tkt_lifetime);
767         } else if (ent_type == SAMBA_KDC_ENT_TYPE_KRBTGT || ent_type == SAMBA_KDC_ENT_TYPE_CLIENT) {
768                 *entry_ex->entry.max_life = nt_time_to_unix(kdc_db_ctx->policy.user_tkt_lifetime);
769         } else {
770                 *entry_ex->entry.max_life = MIN(nt_time_to_unix(kdc_db_ctx->policy.service_tkt_lifetime),
771                                                nt_time_to_unix(kdc_db_ctx->policy.user_tkt_lifetime));
772         }
773
774         entry_ex->entry.max_renew = malloc(sizeof(*entry_ex->entry.max_life));
775         if (entry_ex->entry.max_renew == NULL) {
776                 ret = ENOMEM;
777                 goto out;
778         }
779
780         *entry_ex->entry.max_renew = nt_time_to_unix(kdc_db_ctx->policy.user_tkt_renewaltime);
781
782         entry_ex->entry.generation = NULL;
783
784         /* Get keys from the db */
785         ret = samba_kdc_message2entry_keys(context, kdc_db_ctx, p, msg,
786                                            rid, is_rodc, userAccountControl,
787                                            ent_type, entry_ex);
788         if (ret) {
789                 /* Could be bougus data in the entry, or out of memory */
790                 goto out;
791         }
792
793         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
794         if (entry_ex->entry.etypes == NULL) {
795                 krb5_clear_error_message(context);
796                 ret = ENOMEM;
797                 goto out;
798         }
799         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
800         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
801         if (entry_ex->entry.etypes->val == NULL) {
802                 krb5_clear_error_message(context);
803                 ret = ENOMEM;
804                 goto out;
805         }
806         for (i=0; i < entry_ex->entry.etypes->len; i++) {
807                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
808         }
809
810
811         p->msg = talloc_steal(p, msg);
812
813 out:
814         if (ret != 0) {
815                 /* This doesn't free ent itself, that is for the eventual caller to do */
816                 hdb_free_entry(context, entry_ex);
817         } else {
818                 talloc_steal(kdc_db_ctx, entry_ex->ctx);
819         }
820
821         return ret;
822 }
823
824 /*
825  * Construct an hdb_entry from a directory entry.
826  */
827 static krb5_error_code samba_kdc_trust_message2entry(krb5_context context,
828                                                struct samba_kdc_db_context *kdc_db_ctx,
829                                                TALLOC_CTX *mem_ctx, krb5_const_principal principal,
830                                                enum trust_direction direction,
831                                                struct ldb_dn *realm_dn,
832                                                struct ldb_message *msg,
833                                                hdb_entry_ex *entry_ex)
834 {
835         struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
836         const char *dnsdomain;
837         const char *realm = lpcfg_realm(lp_ctx);
838         DATA_BLOB password_utf16;
839         struct samr_Password password_hash;
840         const struct ldb_val *password_val;
841         struct trustAuthInOutBlob password_blob;
842         struct samba_kdc_entry *p;
843
844         enum ndr_err_code ndr_err;
845         int ret, trust_direction_flags;
846         unsigned int i;
847
848         p = talloc(mem_ctx, struct samba_kdc_entry);
849         if (!p) {
850                 ret = ENOMEM;
851                 goto out;
852         }
853
854         p->kdc_db_ctx = kdc_db_ctx;
855         p->entry_ex = entry_ex;
856         p->realm_dn = realm_dn;
857
858         talloc_set_destructor(p, samba_kdc_entry_destructor);
859
860         /* make sure we do not have bogus data in there */
861         memset(&entry_ex->entry, 0, sizeof(hdb_entry));
862
863         entry_ex->ctx = p;
864         entry_ex->free_entry = samba_kdc_free_entry;
865
866         /* use 'whenCreated' */
867         entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
868         /* use 'kadmin' for now (needed by mit_samba) */
869         krb5_make_principal(context,
870                             &entry_ex->entry.created_by.principal,
871                             realm, "kadmin", NULL);
872
873         entry_ex->entry.valid_start = NULL;
874
875         trust_direction_flags = ldb_msg_find_attr_as_int(msg, "trustDirection", 0);
876
877         if (direction == INBOUND) {
878                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthIncoming");
879
880         } else { /* OUTBOUND */
881                 dnsdomain = ldb_msg_find_attr_as_string(msg, "trustPartner", NULL);
882                 /* replace realm */
883                 realm = strupper_talloc(mem_ctx, dnsdomain);
884                 password_val = ldb_msg_find_ldb_val(msg, "trustAuthOutgoing");
885         }
886
887         if (!password_val || !(trust_direction_flags & direction)) {
888                 ret = ENOENT;
889                 goto out;
890         }
891
892         ndr_err = ndr_pull_struct_blob(password_val, mem_ctx, &password_blob,
893                                            (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob);
894         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
895                 ret = EINVAL;
896                 goto out;
897         }
898
899         entry_ex->entry.kvno = -1;
900         for (i=0; i < password_blob.count; i++) {
901                 if (password_blob.current.array[i].AuthType == TRUST_AUTH_TYPE_VERSION) {
902                         entry_ex->entry.kvno = password_blob.current.array[i].AuthInfo.version.version;
903                 }
904         }
905
906         for (i=0; i < password_blob.count; i++) {
907                 if (password_blob.current.array[i].AuthType == TRUST_AUTH_TYPE_CLEAR) {
908                         password_utf16 = data_blob_const(password_blob.current.array[i].AuthInfo.clear.password,
909                                                          password_blob.current.array[i].AuthInfo.clear.size);
910                         /* In the future, generate all sorts of
911                          * hashes, but for now we can't safely convert
912                          * the random strings windows uses into
913                          * utf8 */
914
915                         /* but as it is utf16 already, we can get the NT password/arcfour-hmac-md5 key */
916                         mdfour(password_hash.hash, password_utf16.data, password_utf16.length);
917                         break;
918                 } else if (password_blob.current.array[i].AuthType == TRUST_AUTH_TYPE_NT4OWF) {
919                         password_hash = password_blob.current.array[i].AuthInfo.nt4owf.password;
920                         break;
921                 }
922         }
923
924         if (i < password_blob.count) {
925                 Key key;
926                 /* Must have found a cleartext or MD4 password */
927                 entry_ex->entry.keys.val = calloc(1, sizeof(Key));
928
929                 key.mkvno = 0;
930                 key.salt = NULL; /* No salt for this enc type */
931
932                 if (entry_ex->entry.keys.val == NULL) {
933                         ret = ENOMEM;
934                         goto out;
935                 }
936
937                 ret = krb5_keyblock_init(context,
938                                          ENCTYPE_ARCFOUR_HMAC,
939                                          password_hash.hash, sizeof(password_hash.hash),
940                                          &key.key);
941
942                 entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key;
943                 entry_ex->entry.keys.len++;
944         }
945
946         entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal)));
947
948         ret = copy_Principal(principal, entry_ex->entry.principal);
949         if (ret) {
950                 krb5_clear_error_message(context);
951                 goto out;
952         }
953
954         /* While we have copied the client principal, tests
955          * show that Win2k3 returns the 'corrected' realm, not
956          * the client-specified realm.  This code attempts to
957          * replace the client principal's realm with the one
958          * we determine from our records */
959
960         krb5_principal_set_realm(context, entry_ex->entry.principal, realm);
961         entry_ex->entry.flags = int2HDBFlags(0);
962         entry_ex->entry.flags.immutable = 1;
963         entry_ex->entry.flags.invalid = 0;
964         entry_ex->entry.flags.server = 1;
965         entry_ex->entry.flags.require_preauth = 1;
966
967         entry_ex->entry.pw_end = NULL;
968
969         entry_ex->entry.max_life = NULL;
970
971         entry_ex->entry.max_renew = NULL;
972
973         entry_ex->entry.generation = NULL;
974
975         entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes)));
976         if (entry_ex->entry.etypes == NULL) {
977                 krb5_clear_error_message(context);
978                 ret = ENOMEM;
979                 goto out;
980         }
981         entry_ex->entry.etypes->len = entry_ex->entry.keys.len;
982         entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int));
983         if (entry_ex->entry.etypes->val == NULL) {
984                 krb5_clear_error_message(context);
985                 ret = ENOMEM;
986                 goto out;
987         }
988         for (i=0; i < entry_ex->entry.etypes->len; i++) {
989                 entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype;
990         }
991
992
993         p->msg = talloc_steal(p, msg);
994
995 out:
996         if (ret != 0) {
997                 /* This doesn't free ent itself, that is for the eventual caller to do */
998                 hdb_free_entry(context, entry_ex);
999         } else {
1000                 talloc_steal(kdc_db_ctx, entry_ex->ctx);
1001         }
1002
1003         return ret;
1004
1005 }
1006
1007 static krb5_error_code samba_kdc_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx,
1008                                         TALLOC_CTX *mem_ctx,
1009                                         const char *realm,
1010                                         struct ldb_dn *realm_dn,
1011                                         struct ldb_message **pmsg)
1012 {
1013         int lret;
1014         krb5_error_code ret;
1015         char *filter = NULL;
1016         const char * const *attrs = trust_attrs;
1017
1018         struct ldb_result *res = NULL;
1019         char *realm_encoded = ldb_binary_encode_string(mem_ctx, realm);
1020         if (!realm_encoded) {
1021                 if (!filter) {
1022                         ret = ENOMEM;
1023                         krb5_set_error_message(context, ret, "talloc_asprintf: out of memory");
1024                         return ret;
1025                 }
1026         }
1027         filter = talloc_asprintf(mem_ctx, "(&(objectClass=trustedDomain)(|(flatname=%s)(trustPartner=%s)))", 
1028                                  realm_encoded, realm_encoded);
1029
1030         if (!filter) {
1031                 talloc_free(realm_encoded);
1032                 ret = ENOMEM;
1033                 krb5_set_error_message(context, ret, "talloc_asprintf: out of memory");
1034                 return ret;
1035         }
1036
1037         lret = ldb_search(ldb_ctx, mem_ctx, &res,
1038                           ldb_get_default_basedn(ldb_ctx),
1039                           LDB_SCOPE_SUBTREE, attrs, "%s", filter);
1040         if (lret != LDB_SUCCESS) {
1041                 DEBUG(3, ("Failed to search for %s: %s\n", filter, ldb_errstring(ldb_ctx)));
1042                 return HDB_ERR_NOENTRY;
1043         } else if (res->count == 0 || res->count > 1) {
1044                 DEBUG(3, ("Failed find a single entry for %s: got %d\n", filter, res->count));
1045                 talloc_free(res);
1046                 return HDB_ERR_NOENTRY;
1047         }
1048         talloc_steal(mem_ctx, res->msgs);
1049         *pmsg = res->msgs[0];
1050         talloc_free(res);
1051         return 0;
1052 }
1053
1054 static krb5_error_code samba_kdc_lookup_client(krb5_context context,
1055                                                 struct samba_kdc_db_context *kdc_db_ctx,
1056                                                 TALLOC_CTX *mem_ctx,
1057                                                 krb5_const_principal principal,
1058                                                 const char **attrs,
1059                                                 struct ldb_dn **realm_dn,
1060                                                 struct ldb_message **msg) {
1061         NTSTATUS nt_status;
1062         char *principal_string;
1063         krb5_error_code ret;
1064
1065         ret = krb5_unparse_name(context, principal, &principal_string);
1066
1067         if (ret != 0) {
1068                 return ret;
1069         }
1070
1071         nt_status = sam_get_results_principal(kdc_db_ctx->samdb,
1072                                               mem_ctx, principal_string, attrs,
1073                                               realm_dn, msg);
1074         free(principal_string);
1075         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
1076                 return HDB_ERR_NOENTRY;
1077         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
1078                 return ENOMEM;
1079         } else if (!NT_STATUS_IS_OK(nt_status)) {
1080                 return EINVAL;
1081         }
1082
1083         return ret;
1084 }
1085
1086 static krb5_error_code samba_kdc_fetch_client(krb5_context context,
1087                                                struct samba_kdc_db_context *kdc_db_ctx,
1088                                                TALLOC_CTX *mem_ctx,
1089                                                krb5_const_principal principal,
1090                                                unsigned flags,
1091                                                hdb_entry_ex *entry_ex) {
1092         struct ldb_dn *realm_dn;
1093         krb5_error_code ret;
1094         struct ldb_message *msg = NULL;
1095
1096         ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1097                                        mem_ctx, principal, user_attrs,
1098                                        &realm_dn, &msg);
1099         if (ret != 0) {
1100                 return ret;
1101         }
1102
1103         ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1104                                       principal, SAMBA_KDC_ENT_TYPE_CLIENT,
1105                                       flags,
1106                                       realm_dn, msg, entry_ex);
1107         return ret;
1108 }
1109
1110 static krb5_error_code samba_kdc_fetch_krbtgt(krb5_context context,
1111                                               struct samba_kdc_db_context *kdc_db_ctx,
1112                                               TALLOC_CTX *mem_ctx,
1113                                               krb5_const_principal principal,
1114                                               unsigned flags,
1115                                               uint32_t krbtgt_number,
1116                                               hdb_entry_ex *entry_ex)
1117 {
1118         struct loadparm_context *lp_ctx = kdc_db_ctx->lp_ctx;
1119         krb5_error_code ret;
1120         struct ldb_message *msg = NULL;
1121         struct ldb_dn *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1122
1123         krb5_principal alloc_principal = NULL;
1124         if (principal->name.name_string.len != 2
1125             || (strcmp(principal->name.name_string.val[0], KRB5_TGS_NAME) != 0)) {
1126                 /* Not a krbtgt */
1127                 return HDB_ERR_NOENTRY;
1128         }
1129
1130         /* krbtgt case.  Either us or a trusted realm */
1131
1132         if (lpcfg_is_my_domain_or_realm(lp_ctx, principal->realm)
1133             && lpcfg_is_my_domain_or_realm(lp_ctx, principal->name.name_string.val[1])) {
1134                 /* us, or someone quite like us */
1135                 /* Cludge, cludge cludge.  If the realm part of krbtgt/realm,
1136                  * is in our db, then direct the caller at our primary
1137                  * krbtgt */
1138
1139                 int lret;
1140
1141                 if (krbtgt_number == kdc_db_ctx->my_krbtgt_number) {
1142                         lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1143                                                &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
1144                                                krbtgt_attrs, 0,
1145                                                "(objectClass=user)");
1146                 } else {
1147                         /* We need to look up an RODC krbtgt (perhaps
1148                          * ours, if we are an RODC, perhaps another
1149                          * RODC if we are a read-write DC */
1150                         lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx,
1151                                                &msg, realm_dn, LDB_SCOPE_SUBTREE,
1152                                                krbtgt_attrs,
1153                                                DSDB_SEARCH_SHOW_EXTENDED_DN,
1154                                                "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=%u))", (unsigned)(krbtgt_number));
1155                 }
1156
1157                 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1158                         krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1159                                    (unsigned)(krbtgt_number));
1160                         krb5_set_error_message(context, HDB_ERR_NOENTRY,
1161                                                "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1162                                                (unsigned)(krbtgt_number));
1163                         return HDB_ERR_NOENTRY;
1164                 } else if (lret != LDB_SUCCESS) {
1165                         krb5_warnx(context, "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1166                                    (unsigned)(krbtgt_number));
1167                         krb5_set_error_message(context, HDB_ERR_NOENTRY,
1168                                                "samba_kdc_fetch: could not find KRBTGT number %u in DB!",
1169                                                (unsigned)(krbtgt_number));
1170                         return HDB_ERR_NOENTRY;
1171                 }
1172
1173                 if (flags & HDB_F_CANON) {
1174                         ret = krb5_copy_principal(context, principal, &alloc_principal);
1175                         if (ret) {
1176                                 return ret;
1177                         }
1178
1179                         /* When requested to do so, ensure that the
1180                          * both realm values in the principal are set
1181                          * to the upper case, canonical realm */
1182                         free(alloc_principal->name.name_string.val[1]);
1183                         alloc_principal->name.name_string.val[1] = strdup(lpcfg_realm(lp_ctx));
1184                         if (!alloc_principal->name.name_string.val[1]) {
1185                                 ret = ENOMEM;
1186                                 krb5_set_error_message(context, ret, "samba_kdc_fetch: strdup() failed!");
1187                                 return ret;
1188                         }
1189                         principal = alloc_principal;
1190                 }
1191
1192                 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1193                                               principal, SAMBA_KDC_ENT_TYPE_KRBTGT,
1194                                               flags, realm_dn, msg, entry_ex);
1195                 if (flags & HDB_F_CANON) {
1196                         /* This is again copied in the message2entry call */
1197                         krb5_free_principal(context, alloc_principal);
1198                 }
1199                 if (ret != 0) {
1200                         krb5_warnx(context, "samba_kdc_fetch: self krbtgt message2entry failed");
1201                 }
1202                 return ret;
1203
1204         } else {
1205                 enum trust_direction direction = UNKNOWN;
1206                 const char *realm = NULL;
1207
1208                 /* Either an inbound or outbound trust */
1209
1210                 if (strcasecmp(lpcfg_realm(lp_ctx), principal->realm) == 0) {
1211                         /* look for inbound trust */
1212                         direction = INBOUND;
1213                         realm = principal->name.name_string.val[1];
1214                 } else if (strcasecmp(lpcfg_realm(lp_ctx), principal->name.name_string.val[1]) == 0) {
1215                         /* look for outbound trust */
1216                         direction = OUTBOUND;
1217                         realm = principal->realm;
1218                 } else {
1219                         krb5_warnx(context, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1220                                    principal->realm, principal->name.name_string.val[1]);
1221                         krb5_set_error_message(context, HDB_ERR_NOENTRY, "samba_kdc_fetch: not our realm for trusts ('%s', '%s')",
1222                                                principal->realm, principal->name.name_string.val[1]);
1223                         return HDB_ERR_NOENTRY;
1224                 }
1225
1226                 /* Trusted domains are under CN=system */
1227
1228                 ret = samba_kdc_lookup_trust(context, kdc_db_ctx->samdb,
1229                                        mem_ctx,
1230                                        realm, realm_dn, &msg);
1231
1232                 if (ret != 0) {
1233                         krb5_warnx(context, "samba_kdc_fetch: could not find principal in DB");
1234                         krb5_set_error_message(context, ret, "samba_kdc_fetch: could not find principal in DB");
1235                         return ret;
1236                 }
1237
1238                 ret = samba_kdc_trust_message2entry(context, kdc_db_ctx, mem_ctx,
1239                                               principal, direction,
1240                                               realm_dn, msg, entry_ex);
1241                 if (ret != 0) {
1242                         krb5_warnx(context, "samba_kdc_fetch: trust_message2entry failed");
1243                 }
1244                 return ret;
1245         }
1246
1247 }
1248
1249 static krb5_error_code samba_kdc_lookup_server(krb5_context context,
1250                                                 struct samba_kdc_db_context *kdc_db_ctx,
1251                                                 TALLOC_CTX *mem_ctx,
1252                                                 krb5_const_principal principal,
1253                                                 const char **attrs,
1254                                                 struct ldb_dn **realm_dn,
1255                                                 struct ldb_message **msg)
1256 {
1257         krb5_error_code ret;
1258         if (principal->name.name_string.len >= 2) {
1259                 /* 'normal server' case */
1260                 int ldb_ret;
1261                 NTSTATUS nt_status;
1262                 struct ldb_dn *user_dn;
1263                 char *principal_string;
1264
1265                 ret = krb5_unparse_name_flags(context, principal,
1266                                               KRB5_PRINCIPAL_UNPARSE_NO_REALM,
1267                                               &principal_string);
1268                 if (ret != 0) {
1269                         return ret;
1270                 }
1271
1272                 /* At this point we may find the host is known to be
1273                  * in a different realm, so we should generate a
1274                  * referral instead */
1275                 nt_status = crack_service_principal_name(kdc_db_ctx->samdb,
1276                                                          mem_ctx, principal_string,
1277                                                          &user_dn, realm_dn);
1278                 free(principal_string);
1279
1280                 if (!NT_STATUS_IS_OK(nt_status)) {
1281                         return HDB_ERR_NOENTRY;
1282                 }
1283
1284                 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb,
1285                                           mem_ctx,
1286                                           msg, user_dn, LDB_SCOPE_BASE,
1287                                           attrs, DSDB_SEARCH_SHOW_EXTENDED_DN, "(objectClass=*)");
1288                 if (ldb_ret != LDB_SUCCESS) {
1289                         return HDB_ERR_NOENTRY;
1290                 }
1291
1292         } else {
1293                 int lret;
1294                 char *filter = NULL;
1295                 char *short_princ;
1296                 const char *realm;
1297                 /* server as client principal case, but we must not lookup userPrincipalNames */
1298                 *realm_dn = ldb_get_default_basedn(kdc_db_ctx->samdb);
1299                 realm = krb5_principal_get_realm(context, principal);
1300
1301                 /* TODO: Check if it is our realm, otherwise give referall */
1302
1303                 ret = krb5_unparse_name_flags(context, principal,  KRB5_PRINCIPAL_UNPARSE_NO_REALM, &short_princ);
1304
1305                 if (ret != 0) {
1306                         krb5_set_error_message(context, ret, "samba_kdc_lookup_principal: could not parse principal");
1307                         krb5_warnx(context, "samba_kdc_lookup_principal: could not parse principal");
1308                         return ret;
1309                 }
1310
1311                 lret = dsdb_search_one(kdc_db_ctx->samdb, mem_ctx, msg,
1312                                        *realm_dn, LDB_SCOPE_SUBTREE,
1313                                        attrs,
1314                                        DSDB_SEARCH_SHOW_EXTENDED_DN,
1315                                        "(&(objectClass=user)(samAccountName=%s))",
1316                                        ldb_binary_encode_string(mem_ctx, short_princ));
1317                 free(short_princ);
1318                 if (lret == LDB_ERR_NO_SUCH_OBJECT) {
1319                         DEBUG(3, ("Failed find a entry for %s\n", filter));
1320                         return HDB_ERR_NOENTRY;
1321                 }
1322                 if (lret != LDB_SUCCESS) {
1323                         DEBUG(3, ("Failed single search for for %s - %s\n",
1324                                   filter, ldb_errstring(kdc_db_ctx->samdb)));
1325                         return HDB_ERR_NOENTRY;
1326                 }
1327         }
1328
1329         return 0;
1330 }
1331
1332 static krb5_error_code samba_kdc_fetch_server(krb5_context context,
1333                                               struct samba_kdc_db_context *kdc_db_ctx,
1334                                               TALLOC_CTX *mem_ctx,
1335                                               krb5_const_principal principal,
1336                                               unsigned flags,
1337                                               hdb_entry_ex *entry_ex)
1338 {
1339         krb5_error_code ret;
1340         struct ldb_dn *realm_dn;
1341         struct ldb_message *msg;
1342
1343         ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, principal,
1344                                        server_attrs, &realm_dn, &msg);
1345         if (ret != 0) {
1346                 return ret;
1347         }
1348
1349         ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1350                                       principal, SAMBA_KDC_ENT_TYPE_SERVER,
1351                                       flags,
1352                                       realm_dn, msg, entry_ex);
1353         if (ret != 0) {
1354                 krb5_warnx(context, "samba_kdc_fetch: message2entry failed");
1355         }
1356
1357         return ret;
1358 }
1359
1360 krb5_error_code samba_kdc_fetch(krb5_context context,
1361                                 struct samba_kdc_db_context *kdc_db_ctx,
1362                                 krb5_const_principal principal,
1363                                 unsigned flags,
1364                                 krb5_kvno kvno,
1365                                 hdb_entry_ex *entry_ex)
1366 {
1367         krb5_error_code ret = HDB_ERR_NOENTRY;
1368         TALLOC_CTX *mem_ctx;
1369         unsigned int krbtgt_number;
1370         if (flags & HDB_F_KVNO_SPECIFIED) {
1371                 krbtgt_number = SAMBA_KVNO_GET_KRBTGT(kvno);
1372                 if (kdc_db_ctx->rodc) {
1373                         if (krbtgt_number != kdc_db_ctx->my_krbtgt_number) {
1374                                 return HDB_ERR_NOT_FOUND_HERE;
1375                         }
1376                 }
1377         } else {
1378                 krbtgt_number = kdc_db_ctx->my_krbtgt_number;
1379         }
1380
1381         mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_fetch context");
1382         if (!mem_ctx) {
1383                 ret = ENOMEM;
1384                 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
1385                 return ret;
1386         }
1387
1388         if (flags & HDB_F_GET_CLIENT) {
1389                 ret = samba_kdc_fetch_client(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
1390                 if (ret != HDB_ERR_NOENTRY) goto done;
1391         }
1392         if (flags & HDB_F_GET_SERVER) {
1393                 /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */
1394                 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, krbtgt_number, entry_ex);
1395                 if (ret != HDB_ERR_NOENTRY) goto done;
1396
1397                 /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */
1398                 ret = samba_kdc_fetch_server(context, kdc_db_ctx, mem_ctx, principal, flags, entry_ex);
1399                 if (ret != HDB_ERR_NOENTRY) goto done;
1400         }
1401         if (flags & HDB_F_GET_KRBTGT) {
1402                 ret = samba_kdc_fetch_krbtgt(context, kdc_db_ctx, mem_ctx, principal, flags, krbtgt_number, entry_ex);
1403                 if (ret != HDB_ERR_NOENTRY) goto done;
1404         }
1405
1406 done:
1407         talloc_free(mem_ctx);
1408         return ret;
1409 }
1410
1411 struct samba_kdc_seq {
1412         unsigned int index;
1413         unsigned int count;
1414         struct ldb_message **msgs;
1415         struct ldb_dn *realm_dn;
1416 };
1417
1418 static krb5_error_code samba_kdc_seq(krb5_context context,
1419                                      struct samba_kdc_db_context *kdc_db_ctx,
1420                                      hdb_entry_ex *entry)
1421 {
1422         krb5_error_code ret;
1423         struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
1424         TALLOC_CTX *mem_ctx;
1425         hdb_entry_ex entry_ex;
1426         memset(&entry_ex, '\0', sizeof(entry_ex));
1427
1428         if (!priv) {
1429                 return HDB_ERR_NOENTRY;
1430         }
1431
1432         mem_ctx = talloc_named(priv, 0, "samba_kdc_seq context");
1433
1434         if (!mem_ctx) {
1435                 ret = ENOMEM;
1436                 krb5_set_error_message(context, ret, "samba_kdc_seq: talloc_named() failed!");
1437                 return ret;
1438         }
1439
1440         if (priv->index < priv->count) {
1441                 ret = samba_kdc_message2entry(context, kdc_db_ctx, mem_ctx,
1442                                               NULL, SAMBA_KDC_ENT_TYPE_ANY,
1443                                               HDB_F_ADMIN_DATA|HDB_F_GET_ANY,
1444                                               priv->realm_dn, priv->msgs[priv->index++], entry);
1445         } else {
1446                 ret = HDB_ERR_NOENTRY;
1447         }
1448
1449         if (ret != 0) {
1450                 TALLOC_FREE(priv);
1451                 kdc_db_ctx->seq_ctx = NULL;
1452         } else {
1453                 talloc_free(mem_ctx);
1454         }
1455
1456         return ret;
1457 }
1458
1459 krb5_error_code samba_kdc_firstkey(krb5_context context,
1460                                    struct samba_kdc_db_context *kdc_db_ctx,
1461                                    hdb_entry_ex *entry)
1462 {
1463         struct ldb_context *ldb_ctx = kdc_db_ctx->samdb;
1464         struct samba_kdc_seq *priv = kdc_db_ctx->seq_ctx;
1465         char *realm;
1466         struct ldb_result *res = NULL;
1467         krb5_error_code ret;
1468         TALLOC_CTX *mem_ctx;
1469         int lret;
1470
1471         if (priv) {
1472                 TALLOC_FREE(priv);
1473                 kdc_db_ctx->seq_ctx = NULL;
1474         }
1475
1476         priv = (struct samba_kdc_seq *) talloc(kdc_db_ctx, struct samba_kdc_seq);
1477         if (!priv) {
1478                 ret = ENOMEM;
1479                 krb5_set_error_message(context, ret, "talloc: out of memory");
1480                 return ret;
1481         }
1482
1483         priv->index = 0;
1484         priv->msgs = NULL;
1485         priv->realm_dn = ldb_get_default_basedn(ldb_ctx);
1486         priv->count = 0;
1487
1488         mem_ctx = talloc_named(priv, 0, "samba_kdc_firstkey context");
1489
1490         if (!mem_ctx) {
1491                 ret = ENOMEM;
1492                 krb5_set_error_message(context, ret, "samba_kdc_firstkey: talloc_named() failed!");
1493                 return ret;
1494         }
1495
1496         ret = krb5_get_default_realm(context, &realm);
1497         if (ret != 0) {
1498                 TALLOC_FREE(priv);
1499                 return ret;
1500         }
1501
1502         lret = ldb_search(ldb_ctx, priv, &res,
1503                           priv->realm_dn, LDB_SCOPE_SUBTREE, user_attrs,
1504                           "(objectClass=user)");
1505
1506         if (lret != LDB_SUCCESS) {
1507                 TALLOC_FREE(priv);
1508                 return HDB_ERR_NOENTRY;
1509         }
1510
1511         priv->count = res->count;
1512         priv->msgs = talloc_steal(priv, res->msgs);
1513         talloc_free(res);
1514
1515         kdc_db_ctx->seq_ctx = priv;
1516
1517         ret = samba_kdc_seq(context, kdc_db_ctx, entry);
1518
1519         if (ret != 0) {
1520                 TALLOC_FREE(priv);
1521                 kdc_db_ctx->seq_ctx = NULL;
1522         } else {
1523                 talloc_free(mem_ctx);
1524         }
1525         return ret;
1526 }
1527
1528 krb5_error_code samba_kdc_nextkey(krb5_context context,
1529                                   struct samba_kdc_db_context *kdc_db_ctx,
1530                                   hdb_entry_ex *entry)
1531 {
1532         return samba_kdc_seq(context, kdc_db_ctx, entry);
1533 }
1534
1535 /* Check if a given entry may delegate or do s4u2self to this target principal
1536  *
1537  * This is currently a very nasty hack - allowing only delegation to itself.
1538  */
1539 krb5_error_code
1540 samba_kdc_check_s4u2self(krb5_context context,
1541                          struct samba_kdc_db_context *kdc_db_ctx,
1542                          hdb_entry_ex *entry,
1543                          krb5_const_principal target_principal)
1544 {
1545         krb5_error_code ret;
1546         krb5_principal enterprise_prinicpal = NULL;
1547         struct ldb_dn *realm_dn;
1548         struct ldb_message *msg;
1549         struct dom_sid *orig_sid;
1550         struct dom_sid *target_sid;
1551         struct samba_kdc_entry *p = talloc_get_type(entry->ctx, struct samba_kdc_entry);
1552         const char *delegation_check_attrs[] = {
1553                 "objectSid", NULL
1554         };
1555
1556         TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_s4u2self");
1557
1558         if (!mem_ctx) {
1559                 ret = ENOMEM;
1560                 krb5_set_error_message(context, ret, "samba_kdc_check_s4u2self: talloc_named() failed!");
1561                 return ret;
1562         }
1563
1564         if (target_principal->name.name_type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
1565                 /* Need to reparse the enterprise principal to find the real target */
1566                 if (target_principal->name.name_string.len != 1) {
1567                         ret = KRB5_PARSE_MALFORMED;
1568                         krb5_set_error_message(context, ret, "samba_kdc_check_s4u2self: request for delegation to enterprise principal with wrong (%d) number of components",
1569                                                target_principal->name.name_string.len);
1570                         talloc_free(mem_ctx);
1571                         return ret;
1572                 }
1573                 ret = krb5_parse_name(context, target_principal->name.name_string.val[0],
1574                                       &enterprise_prinicpal);
1575                 if (ret) {
1576                         talloc_free(mem_ctx);
1577                         return ret;
1578                 }
1579                 target_principal = enterprise_prinicpal;
1580         }
1581
1582         ret = samba_kdc_lookup_server(context, kdc_db_ctx, mem_ctx, target_principal,
1583                                        delegation_check_attrs, &realm_dn, &msg);
1584
1585         krb5_free_principal(context, enterprise_prinicpal);
1586
1587         if (ret != 0) {
1588                 talloc_free(mem_ctx);
1589                 return ret;
1590         }
1591
1592         orig_sid = samdb_result_dom_sid(mem_ctx, p->msg, "objectSid");
1593         target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
1594
1595         /* Allow delegation to the same principal, even if by a different
1596          * name.  The easy and safe way to prove this is by SID
1597          * comparison */
1598         if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
1599                 talloc_free(mem_ctx);
1600                 return KRB5KDC_ERR_BADOPTION;
1601         }
1602
1603         talloc_free(mem_ctx);
1604         return ret;
1605 }
1606
1607 /* Certificates printed by a the Certificate Authority might have a
1608  * slightly different form of the user principal name to that in the
1609  * database.  Allow a mismatch where they both refer to the same
1610  * SID */
1611
1612 krb5_error_code
1613 samba_kdc_check_pkinit_ms_upn_match(krb5_context context,
1614                                     struct samba_kdc_db_context *kdc_db_ctx,
1615                                      hdb_entry_ex *entry,
1616                                      krb5_const_principal certificate_principal)
1617 {
1618         krb5_error_code ret;
1619         struct ldb_dn *realm_dn;
1620         struct ldb_message *msg;
1621         struct dom_sid *orig_sid;
1622         struct dom_sid *target_sid;
1623         struct samba_kdc_entry *p = talloc_get_type(entry->ctx, struct samba_kdc_entry);
1624         const char *ms_upn_check_attrs[] = {
1625                 "objectSid", NULL
1626         };
1627
1628         TALLOC_CTX *mem_ctx = talloc_named(kdc_db_ctx, 0, "samba_kdc_check_pkinit_ms_upn_match");
1629
1630         if (!mem_ctx) {
1631                 ret = ENOMEM;
1632                 krb5_set_error_message(context, ret, "samba_kdc_fetch: talloc_named() failed!");
1633                 return ret;
1634         }
1635
1636         ret = samba_kdc_lookup_client(context, kdc_db_ctx,
1637                                        mem_ctx, certificate_principal,
1638                                        ms_upn_check_attrs, &realm_dn, &msg);
1639
1640         if (ret != 0) {
1641                 talloc_free(mem_ctx);
1642                 return ret;
1643         }
1644
1645         orig_sid = samdb_result_dom_sid(mem_ctx, p->msg, "objectSid");
1646         target_sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
1647
1648         /* Consider these to be the same principal, even if by a different
1649          * name.  The easy and safe way to prove this is by SID
1650          * comparison */
1651         if (!(orig_sid && target_sid && dom_sid_equal(orig_sid, target_sid))) {
1652                 talloc_free(mem_ctx);
1653                 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1654         }
1655
1656         talloc_free(mem_ctx);
1657         return ret;
1658 }
1659
1660 /*
1661  * Check if a given entry may delegate to this target principal
1662  * with S4U2Proxy.
1663  */
1664 krb5_error_code
1665 samba_kdc_check_s4u2proxy(krb5_context context,
1666                           struct samba_kdc_db_context *kdc_db_ctx,
1667                           hdb_entry_ex *entry,
1668                           krb5_const_principal target_principal)
1669 {
1670         return KRB5KDC_ERR_BADOPTION;
1671 }
1672
1673 NTSTATUS samba_kdc_setup_db_ctx(TALLOC_CTX *mem_ctx, struct samba_kdc_base_context *base_ctx,
1674                                 struct samba_kdc_db_context **kdc_db_ctx_out)
1675 {
1676         int ldb_ret;
1677         struct ldb_message *msg;
1678         struct auth_session_info *session_info;
1679         struct samba_kdc_db_context *kdc_db_ctx;
1680         /* The idea here is very simple.  Using Kerberos to
1681          * authenticate the KDC to the LDAP server is higly likely to
1682          * be circular.
1683          *
1684          * In future we may set this up to use EXERNAL and SSL
1685          * certificates, for now it will almost certainly be NTLMSSP_SET_USERNAME
1686         */
1687
1688         kdc_db_ctx = talloc_zero(mem_ctx, struct samba_kdc_db_context);
1689         if (kdc_db_ctx == NULL) {
1690                 return NT_STATUS_NO_MEMORY;
1691         }
1692         kdc_db_ctx->ev_ctx = base_ctx->ev_ctx;
1693         kdc_db_ctx->lp_ctx = base_ctx->lp_ctx;
1694
1695         kdc_get_policy(base_ctx->lp_ctx, NULL, &kdc_db_ctx->policy);
1696
1697         session_info = system_session(kdc_db_ctx->lp_ctx);
1698         if (session_info == NULL) {
1699                 return NT_STATUS_INTERNAL_ERROR;
1700         }
1701
1702         /* Setup the link to LDB */
1703         kdc_db_ctx->samdb = samdb_connect(kdc_db_ctx, base_ctx->ev_ctx,
1704                                           base_ctx->lp_ctx, session_info, 0);
1705         if (kdc_db_ctx->samdb == NULL) {
1706                 DEBUG(1, ("hdb_samba4_create: Cannot open samdb for KDC backend!"));
1707                 talloc_free(kdc_db_ctx);
1708                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1709         }
1710
1711         /* Find out our own krbtgt kvno */
1712         ldb_ret = samdb_rodc(kdc_db_ctx->samdb, &kdc_db_ctx->rodc);
1713         if (ldb_ret != LDB_SUCCESS) {
1714                 DEBUG(1, ("hdb_samba4_create: Cannot determine if we are an RODC in KDC backend: %s\n",
1715                           ldb_errstring(kdc_db_ctx->samdb)));
1716                 talloc_free(kdc_db_ctx);
1717                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1718         }
1719         if (kdc_db_ctx->rodc) {
1720                 int my_krbtgt_number;
1721                 const char *secondary_keytab[] = { "msDS-SecondaryKrbTgtNumber", NULL };
1722                 struct ldb_dn *account_dn;
1723                 struct ldb_dn *server_dn = samdb_server_dn(kdc_db_ctx->samdb, kdc_db_ctx);
1724                 if (!server_dn) {
1725                         DEBUG(1, ("hdb_samba4_create: Cannot determine server DN in KDC backend: %s\n",
1726                                   ldb_errstring(kdc_db_ctx->samdb)));
1727                         talloc_free(kdc_db_ctx);
1728                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1729                 }
1730
1731                 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, server_dn,
1732                                              "serverReference", &account_dn);
1733                 if (ldb_ret != LDB_SUCCESS) {
1734                         DEBUG(1, ("hdb_samba4_create: Cannot determine server account in KDC backend: %s\n",
1735                                   ldb_errstring(kdc_db_ctx->samdb)));
1736                         talloc_free(kdc_db_ctx);
1737                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1738                 }
1739
1740                 ldb_ret = samdb_reference_dn(kdc_db_ctx->samdb, kdc_db_ctx, account_dn,
1741                                              "msDS-KrbTgtLink", &kdc_db_ctx->krbtgt_dn);
1742                 talloc_free(account_dn);
1743                 if (ldb_ret != LDB_SUCCESS) {
1744                         DEBUG(1, ("hdb_samba4_create: Cannot determine RODC krbtgt account in KDC backend: %s\n",
1745                                   ldb_errstring(kdc_db_ctx->samdb)));
1746                         talloc_free(kdc_db_ctx);
1747                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1748                 }
1749
1750                 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
1751                                           &msg, kdc_db_ctx->krbtgt_dn, LDB_SCOPE_BASE,
1752                                           secondary_keytab,
1753                                           0,
1754                                           "(&(objectClass=user)(msDS-SecondaryKrbTgtNumber=*))");
1755                 if (ldb_ret != LDB_SUCCESS) {
1756                         DEBUG(1, ("hdb_samba4_create: Cannot read krbtgt account %s in KDC backend to get msDS-SecondaryKrbTgtNumber: %s: %s\n",
1757                                   ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
1758                                   ldb_errstring(kdc_db_ctx->samdb),
1759                                   ldb_strerror(ldb_ret)));
1760                         talloc_free(kdc_db_ctx);
1761                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1762                 }
1763                 my_krbtgt_number = ldb_msg_find_attr_as_int(msg, "msDS-SecondaryKrbTgtNumber", -1);
1764                 if (my_krbtgt_number == -1) {
1765                         DEBUG(1, ("hdb_samba4_create: Cannot read msDS-SecondaryKrbTgtNumber from krbtgt account %s in KDC backend: got %d\n",
1766                                   ldb_dn_get_linearized(kdc_db_ctx->krbtgt_dn),
1767                                   my_krbtgt_number));
1768                         talloc_free(kdc_db_ctx);
1769                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1770                 }
1771                 kdc_db_ctx->my_krbtgt_number = my_krbtgt_number;
1772
1773         } else {
1774                 kdc_db_ctx->my_krbtgt_number = 0;
1775                 ldb_ret = dsdb_search_one(kdc_db_ctx->samdb, kdc_db_ctx,
1776                                           &msg, NULL, LDB_SCOPE_SUBTREE,
1777                                           krbtgt_attrs,
1778                                           0,
1779                                           "(&(objectClass=user)(samAccountName=krbtgt))");
1780
1781                 if (ldb_ret != LDB_SUCCESS) {
1782                         DEBUG(1, ("samba_kdc_fetch: could not find own KRBTGT in DB: %s\n", ldb_errstring(kdc_db_ctx->samdb)));
1783                         talloc_free(kdc_db_ctx);
1784                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1785                 }
1786                 kdc_db_ctx->krbtgt_dn = talloc_steal(kdc_db_ctx, msg->dn);
1787                 kdc_db_ctx->my_krbtgt_number = 0;
1788                 talloc_free(msg);
1789         }
1790         *kdc_db_ctx_out = kdc_db_ctx;
1791         return NT_STATUS_OK;
1792 }