summaryrefslogtreecommitdiff
path: root/source4/kdc/hdb-ldb.c
blob: 0aa18423a042ab4d75b6245ed5afeb61b50823db (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
/*
 * Copyright (c) 1999-2001, 2003, PADL Software Pty Ltd.
 * Copyright (c) 2004, Andrew Bartlett <abartlet@samba.org>.
 * Copyright (c) 2004, Stefan Metzmacher <metze@samba.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of PADL Software  nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "includes.h"
#include "kdc.h"
#include "ads.h"
#include "hdb.h"
#include "lib/ldb/include/ldb.h"
#include "system/iconv.h"

enum hdb_ldb_ent_type 
{ HDB_LDB_ENT_TYPE_CLIENT, HDB_LDB_ENT_TYPE_SERVER, 
  HDB_LDB_ENT_TYPE_KRBTGT, HDB_LDB_ENT_TYPE_ANY };

static const char * const krb5_attrs[] = {
	"objectClass",
	"cn",
	"sAMAccountName",

	"userPrincipalName",
	"servicePrincipalName",

	"userAccountControl",
	"sAMAccountType",

	"objectSid",
	"primaryGroupID",
	"memberOf",

	"unicodePWD",
	"lmPwdHash",
	"ntPwdHash",

	"badPwdCount",
	"badPasswordTime",
	"lastLogoff",
	"lastLogon",
	"pwdLastSet",
	"accountExpires",
	"logonCount",

	"objectGUID",
	"whenCreated",
	"whenChanged",
	"uSNCreated",
	"uSNChanged",
	"msDS-KeyVersionNumber",
	NULL
};

static KerberosTime ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, KerberosTime default_val)
{
    const char *tmp;
    const char *gentime;
    struct tm tm;

    gentime = ldb_msg_find_string(msg, attr, NULL);
    if (!gentime)
	return default_val;

    tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
    if (tmp == NULL) {
	    return default_val;
    }

    return timegm(&tm);
}

static HDBFlags uf2HDBFlags(krb5_context context, int userAccountControl, enum hdb_ldb_ent_type ent_type) 
{
	HDBFlags flags = int2HDBFlags(0);

	krb5_warnx(context, "uf2HDBFlags: userAccountControl: %08x\n", userAccountControl);

	/* we don't allow kadmin deletes */
	flags.immutable = 1;

	/* mark the principal as invalid to start with */
	flags.invalid = 1;

	flags.renewable = 1;

	/* Account types - clear the invalid bit if it turns out to be valid */
	if (userAccountControl & UF_NORMAL_ACCOUNT) {
		if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
			flags.client = 1;
		}
		flags.invalid = 0;
	}
	
	if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) {
		if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
			flags.client = 1;
		}
		flags.invalid = 0;
	}
	if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) {
		if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
			flags.client = 1;
		}
		if (ent_type == HDB_LDB_ENT_TYPE_SERVER || ent_type == HDB_LDB_ENT_TYPE_ANY) {
			flags.server = 1;
		}
		flags.invalid = 0;
	}
	if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
		if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) {
			flags.client = 1;
		}
		if (ent_type == HDB_LDB_ENT_TYPE_SERVER || ent_type == HDB_LDB_ENT_TYPE_ANY) {
			flags.server = 1;
		}
		flags.invalid = 0;
	}

	if (userAccountControl & UF_ACCOUNTDISABLE) {
		flags.invalid = 1;
	}
	if (userAccountControl & UF_LOCKOUT) {
		flags.invalid = 1;
	}
/*
	if (userAccountControl & UF_PASSWORD_NOTREQD) {
		flags.invalid = 1;
	}
*/
/*
	if (userAccountControl & UF_PASSWORD_CANT_CHANGE) {
		flags.invalid = 1;
	}
*/
/*
	if (userAccountControl & UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED) {
		flags.invalid = 1;
	}
*/
	if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) {
		flags.invalid = 1;
	}

/* UF_DONT_EXPIRE_PASSWD handled in LDB_message2entry() */

/*
	if (userAccountControl & UF_MNS_LOGON_ACCOUNT) {
		flags.invalid = 1;
	}
*/
	if (userAccountControl & UF_SMARTCARD_REQUIRED) {
		flags.require_hwauth = 1;
	}
	if (flags.server && (userAccountControl & UF_TRUSTED_FOR_DELEGATION)) {
		flags.forwardable = 1;
		flags.proxiable = 1;
	} else if (flags.client && (userAccountControl & UF_NOT_DELEGATED)) {
		flags.forwardable = 0;
		flags.proxiable = 0;
	} else {
		flags.forwardable = 1;
		flags.proxiable = 1;
	}

/*
	if (userAccountControl & UF_SMARTCARD_USE_DES_KEY_ONLY) {
		flags.invalid = 1;
	}
*/
	if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) {
		flags.require_preauth = 0;
	} else {
		flags.require_preauth = 1;

	}

	krb5_warnx(context, "uf2HDBFlags: HDBFlags: %08x\n", HDBFlags2int(flags));

	return flags;
}

/*
 * Construct an hdb_entry from a directory entry.
 */
static krb5_error_code LDB_message2entry(krb5_context context, HDB *db, 
					 TALLOC_CTX *mem_ctx, krb5_const_principal principal,
					 enum hdb_ldb_ent_type ent_type, struct ldb_message *realm_msg,
					 struct ldb_message *msg,
					 hdb_entry *ent)
{
	const char *unicodePwd;
	int userAccountControl;
	int i;
	krb5_error_code ret = 0;
	const char *dnsdomain = ldb_msg_find_string(realm_msg, "dnsDomain", NULL);
	char *realm = strupper_talloc(mem_ctx, dnsdomain);

	if (!realm) {
		krb5_set_error_string(context, "talloc_strdup: out of memory");
		ret = ENOMEM;
		goto out;
	}
			
	krb5_warnx(context, "LDB_message2entry:\n");

	memset(ent, 0, sizeof(*ent));

	userAccountControl = ldb_msg_find_int(msg, "userAccountControl", 0);
	
	ent->principal = malloc(sizeof(*(ent->principal)));
	if (ent_type == HDB_LDB_ENT_TYPE_ANY && principal == NULL) {
		const char *samAccountName = ldb_msg_find_string(msg, "samAccountName", NULL);
		if (!samAccountName) {
			krb5_set_error_string(context, "LDB_message2entry: no samAccountName present");
			ret = ENOENT;
			goto out;
		}
		samAccountName = ldb_msg_find_string(msg, "samAccountName", NULL);
		krb5_make_principal(context, &ent->principal, realm, samAccountName, NULL);
	} else {
		char *strdup_realm;
		ret = copy_Principal(principal, ent->principal);
		if (ret) {
			krb5_clear_error_string(context);
			goto out;
		}

		/* While we have copied the client principal, tests
		 * show that Win2k3 returns the 'corrected' realm, not
		 * the client-specified realm.  This code attempts to
		 * replace the client principal's realm with the one
		 * we determine from our records */
		
		/* don't leak */
		free(*krb5_princ_realm(context, ent->principal));
		
		/* this has to be with malloc() */
		strdup_realm = strdup(realm);
		if (!strdup_realm) {
			ret = ENOMEM;
			krb5_clear_error_string(context);
			goto out;
		}
		krb5_princ_set_realm(context, ent->principal, &strdup_realm);
	}

	ent->kvno = ldb_msg_find_int(msg, "msDS-KeyVersionNumber", 0);

	ent->flags = uf2HDBFlags(context, userAccountControl, ent_type);

	if (ent_type == HDB_LDB_ENT_TYPE_KRBTGT) {
		ent->flags.invalid = 0;
		ent->flags.server = 1;
	}

	/* use 'whenCreated' */
	ent->created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0);
	/* use '???' */
	ent->created_by.principal = NULL;

	ent->modified_by = (Event *) malloc(sizeof(Event));
	if (ent->modified_by == NULL) {
		krb5_set_error_string(context, "malloc: out of memory");
		ret = ENOMEM;
		goto out;
	}

	/* use 'whenChanged' */
	ent->modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0);
	/* use '???' */
	ent->modified_by->principal = NULL;

	ent->valid_start = NULL;

	ent->valid_end = NULL;
	ent->pw_end = NULL;

	ent->max_life = NULL;

	ent->max_renew = NULL;

	ent->generation = NULL;

	/* create the keys and enctypes */
	unicodePwd = ldb_msg_find_string(msg, "unicodePwd", NULL);
	if (unicodePwd) {
		/* Many, many thanks to lukeh@padl.com for this
		 * algorithm, described in his Nov 10 2004 mail to
		 * samba-technical@samba.org */

		Principal *salt_principal;
		const char *user_principal_name = ldb_msg_find_string(msg, "userPrincipalName", NULL);
		struct ldb_message_element *objectclasses;
		struct ldb_val computer_val;
		computer_val.data = discard_const_p(uint8_t,"computer");
		computer_val.length = strlen((const char *)computer_val.data);
		
		objectclasses = ldb_msg_find_element(msg, "objectClass");

		if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) {
			/* Determine a salting principal */
			char *samAccountName = talloc_strdup(mem_ctx, ldb_msg_find_string(msg, "samAccountName", NULL));
			char *saltbody;
			if (!samAccountName) {
				krb5_set_error_string(context, "LDB_message2entry: no samAccountName present");
				ret = ENOENT;
				goto out;
			}
			if (samAccountName[strlen(samAccountName)-1] == '$') {
				samAccountName[strlen(samAccountName)-1] = '\0';
			}
			saltbody = talloc_asprintf(mem_ctx, "%s.%s", samAccountName, dnsdomain);
			
			ret = krb5_make_principal(context, &salt_principal, realm, "host", saltbody, NULL);
		} else if (user_principal_name) {
			char *p;
			user_principal_name = talloc_strdup(mem_ctx, user_principal_name);
			if (!user_principal_name) {
				ret = ENOMEM;
				goto out;
			} else {
				p = strchr(user_principal_name, '@');
				if (p) {
					p[0] = '\0';
				}
				ret = krb5_make_principal(context, &salt_principal, realm, user_principal_name, NULL);
			} 
		} else {
			const char *samAccountName = ldb_msg_find_string(msg, "samAccountName", NULL);
			ret = krb5_make_principal(context, &salt_principal, realm, samAccountName, NULL);
		}

		if (ret == 0) {
			size_t num_keys = ent->keys.len;
			/*
			 * create keys from unicodePwd
			 */
			ret = hdb_generate_key_set_password(context, salt_principal, 
							    unicodePwd, 
							    &ent->keys.val, &num_keys);
			ent->keys.len = num_keys;
			krb5_free_principal(context, salt_principal);
		}

		if (ret != 0) {
			krb5_warnx(context, "could not generate keys from unicodePwd\n");
			ent->keys.val = NULL;
			ent->keys.len = 0;
			goto out;
		}
	} else {
		const struct ldb_val *val;
		krb5_data keyvalue;

		val = ldb_msg_find_ldb_val(msg, "ntPwdHash");
		if (!val) {
			krb5_warnx(context, "neither type of key available for this account\n");
			ent->keys.val = NULL;
			ent->keys.len = 0;
		} else if (val->length < 16) {
			ent->keys.val = NULL;
			ent->keys.len = 0;
			krb5_warnx(context, "ntPwdHash has invalid length: %d\n",
				   (int)val->length);
		} else {
			ret = krb5_data_alloc (&keyvalue, 16);
			if (ret) {
				krb5_set_error_string(context, "malloc: out of memory");
				ret = ENOMEM;
				goto out;
			}

			memcpy(keyvalue.data, val->data, 16);

			ent->keys.val = malloc(sizeof(ent->keys.val[0]));
			if (ent->keys.val == NULL) {
				krb5_data_free(&keyvalue);
				krb5_set_error_string(context, "malloc: out of memory");
				ret = ENOMEM;
				goto out;
			}
			
			memset(&ent->keys.val[0], 0, sizeof(Key));
			ent->keys.val[0].key.keytype = ETYPE_ARCFOUR_HMAC_MD5;
			ent->keys.val[0].key.keyvalue = keyvalue;
			
			ent->keys.len = 1;
		}
	}		


	ent->etypes = malloc(sizeof(*(ent->etypes)));
	if (ent->etypes == NULL) {
		krb5_set_error_string(context, "malloc: out of memory");
		ret = ENOMEM;
		goto out;
	}
	ent->etypes->len = ent->keys.len;
	ent->etypes->val = calloc(ent->etypes->len, sizeof(int));
	if (ent->etypes->val == NULL) {
		krb5_set_error_string(context, "malloc: out of memory");
		ret = ENOMEM;
		goto out;
	}
	for (i=0; i < ent->etypes->len; i++) {
		ent->etypes->val[i] = ent->keys.val[i].key.keytype;
	}

out:
	if (ret != 0) {
		/* I don't think this frees ent itself. */
		hdb_free_entry(context, ent);
	}

	return ret;
}

static krb5_error_code LDB_lookup_principal(krb5_context context, struct ldb_context *ldb_ctx, 					
					    TALLOC_CTX *mem_ctx,
					    krb5_const_principal principal,
					    enum hdb_ldb_ent_type ent_type,
					    const char *realm_dn,
					    struct ldb_message ***pmsg)
{
	krb5_error_code ret;
	int count;
	char *filter = NULL;
	const char * const *princ_attrs = krb5_attrs;
	char *p;

	char *princ_str;
	char *princ_str_talloc;
	char *short_princ;

	struct ldb_message **msg = NULL;

	/* Structure assignment, so we don't mess with the source parameter */
	struct Principal princ = *principal;

	/* Allow host/dns.name/realm@REALM, just convert into host/dns.name@REALM */
	if (princ.name.name_string.len == 3
	    && StrCaseCmp(princ.name.name_string.val[2], princ.realm) == 0) { 
		princ.name.name_string.len = 2;
	}

	ret = krb5_unparse_name(context, &princ, &princ_str);

	if (ret != 0) {
		krb5_set_error_string(context, "LDB_lookup_principal: could not parse principal");
		krb5_warnx(context, "LDB_lookup_principal: could not parse principal");
		return ret;
	}

	princ_str_talloc = talloc_strdup(mem_ctx, princ_str);
	short_princ = talloc_strdup(mem_ctx, princ_str);
	free(princ_str);
	if (!short_princ || !princ_str_talloc) {
		krb5_set_error_string(context, "LDB_lookup_principal: talloc_strdup() failed!");
		return ENOMEM;
	}

	p = strchr(short_princ, '@');
	if (p) {
		p[0] = '\0';
	}

	
	switch (ent_type) {
	case HDB_LDB_ENT_TYPE_KRBTGT:
		filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(samAccountName=%s))", 
					 KRB5_TGS_NAME);
		break;
	case HDB_LDB_ENT_TYPE_CLIENT:
		filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(|(samAccountName=%s)(userPrincipalName=%s)))", 
					 short_princ, princ_str_talloc);
		break;
	case HDB_LDB_ENT_TYPE_SERVER:
		filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(|(samAccountName=%s)(servicePrincipalName=%s)))", 
					 short_princ, short_princ);
		break;
	case HDB_LDB_ENT_TYPE_ANY:
		filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(|(|(samAccountName=%s)(servicePrincipalName=%s))(userPrincipalName=%s)))", 
					 short_princ, short_princ, princ_str_talloc);
		break;
	}

	if (!filter) {
		krb5_set_error_string(context, "talloc_asprintf: out of memory");
		return ENOMEM;
	}

	count = ldb_search(ldb_ctx, realm_dn, LDB_SCOPE_SUBTREE, filter, 
			   princ_attrs, &msg);

	if (count < 1) {
		krb5_warnx(context, "ldb_search: basedn: '%s' filter: '%s' failed: %d", 
			   realm_dn, filter, count);
		krb5_set_error_string(context, "ldb_search: basedn: '%s' filter: '%s' failed: %d", 
				      realm_dn, filter, count);
		return HDB_ERR_NOENTRY;
	} else if (count > 1) {
		talloc_free(msg);
		krb5_warnx(context, "ldb_search: basedn: '%s' filter: '%s' more than 1 entry: %d", 
			   realm_dn, filter, count);
		krb5_set_error_string(context, "ldb_search: basedn: '%s' filter: '%s' more than 1 entry: %d", 
				      realm_dn, filter, count);
		return HDB_ERR_NOENTRY;
	}
	*pmsg = talloc_steal(mem_ctx, msg);
	return 0;
}

static krb5_error_code LDB_lookup_realm(krb5_context context, struct ldb_context *ldb_ctx, 
					TALLOC_CTX *mem_ctx,
					const char *realm,
					struct ldb_message ***pmsg)
{
	int count;
	const char *realm_dn;
	char *cross_ref_filter;
	struct ldb_message **cross_ref_msg;
	struct ldb_message **msg;

	const char *cross_ref_attrs[] = {
		"nCName", 
		NULL
	};

	const char *realm_attrs[] = {
		"dnsDomain", 
		"maxPwdAge",
		NULL
	};

	cross_ref_filter = talloc_asprintf(mem_ctx, 
					   "(&(&(|(&(dnsRoot=%s)(nETBIOSName=*))(nETBIOSName=%s))(objectclass=crossRef))(ncName=*))",
					   realm, realm);
	if (!cross_ref_filter) {
		krb5_set_error_string(context, "asprintf: out of memory");
		return ENOMEM;
	}

	count = ldb_search(ldb_ctx, NULL, LDB_SCOPE_SUBTREE, cross_ref_filter, 
			   cross_ref_attrs, &cross_ref_msg);

	if (count < 1) {
		krb5_warnx(context, "ldb_search: filter: '%s' failed: %d", cross_ref_filter, count);
		krb5_set_error_string(context, "ldb_search: filter: '%s' failed: %d", cross_ref_filter, count);

		talloc_free(cross_ref_msg);
		return HDB_ERR_NOENTRY;
	} else if (count > 1) {
		krb5_warnx(context, "ldb_search: filter: '%s' more than 1 entry: %d", cross_ref_filter, count);
		krb5_set_error_string(context, "ldb_search: filter: '%s' more than 1 entry: %d", cross_ref_filter, count);

		talloc_free(cross_ref_msg);
		return HDB_ERR_NOENTRY;
	}

	realm_dn = ldb_msg_find_string(cross_ref_msg[0], "nCName", NULL);

	count = ldb_search(ldb_ctx, realm_dn, LDB_SCOPE_BASE, "(objectClass=domain)",
			   realm_attrs, &msg);
	if (pmsg) {
		*pmsg = talloc_steal(mem_ctx, msg);
	} else {
		talloc_free(msg);
	}

	if (count < 1) {
		krb5_warnx(context, "ldb_search: dn: %s not found: %d", realm_dn, count);
		krb5_set_error_string(context, "ldb_search: dn: %s not found: %d", realm_dn, count);
		return HDB_ERR_NOENTRY;
	} else if (count > 1) {
		krb5_warnx(context, "ldb_search: dn: '%s' more than 1 entry: %d", realm_dn, count);
		krb5_set_error_string(context, "ldb_search: dn: %s more than 1 entry: %d", realm_dn, count);
		return HDB_ERR_NOENTRY;
	}

	return 0;
}

static krb5_error_code LDB_lookup_spn_alias(krb5_context context, struct ldb_context *ldb_ctx, 
					    TALLOC_CTX *mem_ctx,
					    const char *realm_dn,
					    const char *alias_from,
					    char **alias_to)
{
	int i;
	int count;
	struct ldb_message **msg;
	struct ldb_message_element *spnmappings;
	char *service_dn = talloc_asprintf(mem_ctx, 
					   "CN=Directory Service,CN=Windows NT,CN=Services,CN=Configuration,%s", 
					   realm_dn);
	const char *directory_attrs[] = {
		"sPNMappings", 
		NULL
	};

	count = ldb_search(ldb_ctx, service_dn, LDB_SCOPE_BASE, "(objectClass=nTDSService)",
			   directory_attrs, &msg);
	talloc_steal(mem_ctx, msg);

	if (count < 1) {
		krb5_warnx(context, "ldb_search: dn: %s not found: %d", service_dn, count);
		krb5_set_error_string(context, "ldb_search: dn: %s not found: %d", service_dn, count);
		return HDB_ERR_NOENTRY;
	} else if (count > 1) {
		krb5_warnx(context, "ldb_search: dn: %s found %d times!", service_dn, count);
		krb5_set_error_string(context, "ldb_search: dn: %s found %d times!", service_dn, count);
		return HDB_ERR_NOENTRY;
	}
	
	spnmappings = ldb_msg_find_element(msg[0], "sPNMappings");
	if (!spnmappings || spnmappings->num_values == 0) {
		krb5_warnx(context, "ldb_search: dn: %s no sPNMappings attribute", service_dn);
		krb5_set_error_string(context, "ldb_search: dn: %s no sPNMappings attribute", service_dn);
		return HDB_ERR_NOENTRY;
	}

	for (i = 0; i < spnmappings->num_values; i++) {
		char *mapping, *p, *str;
		mapping = talloc_strdup(mem_ctx, 
					(const char *)spnmappings->values[i].data);
		if (!mapping) {
			krb5_warnx(context, "LDB_lookup_spn_alias: ldb_search: dn: %s did not have an sPNMapping", service_dn);
			krb5_set_error_string(context, "LDB_lookup_spn_alias: ldb_search: dn: %s did not have an sPNMapping", service_dn);
			return HDB_ERR_NOENTRY;
		}
		
		/* C string manipulation sucks */
		
		p = strchr(mapping, '=');
		if (!p) {
			krb5_warnx(context, "ldb_search: dn: %s sPNMapping malformed: %s", 
				   service_dn, mapping);
			krb5_set_error_string(context, "ldb_search: dn: %s sPNMapping malformed: %s", 
					      service_dn, mapping);
			return HDB_ERR_NOENTRY;
		}
		p[0] = '\0';
		p++;
		do {
			str = p;
			p = strchr(p, ',');
			if (p) {
				p[0] = '\0';
				p++;
			}
			if (strcasecmp(str, alias_from) == 0) {
				*alias_to = mapping;
				return 0;
			}
		} while (p);
	}
	krb5_warnx(context, "LDB_lookup_spn_alias: no alias for service %s applicable", alias_from);
	return HDB_ERR_NOENTRY;
}

static krb5_error_code LDB_open(krb5_context context, HDB *db, int flags, mode_t mode)
{
	if (db->hdb_master_key_set) {
		krb5_warnx(context, "LDB_open: use of a master key incompatible with LDB\n");
		krb5_set_error_string(context, "LDB_open: use of a master key incompatible with LDB\n");
		return HDB_ERR_NOENTRY;
	}		

	return 0;
}

static krb5_error_code LDB_close(krb5_context context, HDB *db)
{
	return 0;
}

static krb5_error_code LDB_lock(krb5_context context, HDB *db, int operation)
{
	return 0;
}

static krb5_error_code LDB_unlock(krb5_context context, HDB *db)
{
	return 0;
}

static krb5_error_code LDB_rename(krb5_context context, HDB *db, const char *new_name)
{
	return HDB_ERR_DB_INUSE;
}

static krb5_error_code LDB_fetch(krb5_context context, HDB *db, unsigned flags,
				 krb5_const_principal principal,
				 enum hdb_ent_type ent_type,
				 hdb_entry *entry)
{
	struct ldb_message **msg = NULL;
	struct ldb_message **realm_msg = NULL;
	struct ldb_message **realm_fixed_msg = NULL;
	enum hdb_ldb_ent_type ldb_ent_type;
	krb5_error_code ret;

	const char *realm;
	const char *realm_dn;
	TALLOC_CTX *mem_ctx = talloc_named(NULL, 0, "LDB_fetch context");

	if (!mem_ctx) {
		krb5_set_error_string(context, "LDB_fetch: talloc_named() failed!");
		return ENOMEM;
	}

	realm = krb5_principal_get_realm(context, principal);

	ret = LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db, 
			       mem_ctx, realm, &realm_msg);
	if (ret != 0) {
		krb5_warnx(context, "LDB_fetch: could not find realm");
		talloc_free(mem_ctx);
		return HDB_ERR_NOENTRY;
	}

	realm_dn = realm_msg[0]->dn;

	/* Cludge, cludge cludge.  If the realm part of krbtgt/realm,
	 * is in our db, then direct the caller at our primary
	 * krgtgt */
	
	switch (ent_type) {
	case HDB_ENT_TYPE_SERVER:
		if (principal->name.name_string.len == 2
		    && (strcmp(principal->name.name_string.val[0], KRB5_TGS_NAME) == 0)
		    && (LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db,
					 mem_ctx, principal->name.name_string.val[1], &realm_fixed_msg) == 0)) {
			const char *dnsdomain = ldb_msg_find_string(realm_fixed_msg[0], "dnsDomain", NULL);
			char *realm_fixed = strupper_talloc(mem_ctx, dnsdomain);
			if (!realm_fixed) {
				krb5_set_error_string(context, "strupper_talloc: out of memory");
				talloc_free(mem_ctx);
				return ENOMEM;
			}

			free(principal->name.name_string.val[1]);
			principal->name.name_string.val[1] = strdup(realm_fixed);
			talloc_free(realm_fixed);
			if (!principal->name.name_string.val[1]) {
				krb5_set_error_string(context, "LDB_fetch: strdup() failed!");
				talloc_free(mem_ctx);
				return ENOMEM;
			}
			ldb_ent_type = HDB_LDB_ENT_TYPE_KRBTGT;
		} else {
			ldb_ent_type = HDB_LDB_ENT_TYPE_SERVER;
		}
		break;
	case HDB_ENT_TYPE_CLIENT:
		ldb_ent_type = HDB_LDB_ENT_TYPE_CLIENT;
		break;
	case HDB_ENT_TYPE_ANY:
		ldb_ent_type = HDB_LDB_ENT_TYPE_ANY;
		break;
	default:
		krb5_warnx(context, "LDB_fetch: invalid ent_type specified!");
		talloc_free(mem_ctx);
		return HDB_ERR_NOENTRY;
	}

	ret = LDB_lookup_principal(context, (struct ldb_context *)db->hdb_db, 
				   mem_ctx, 
				   principal, ldb_ent_type, realm_dn, &msg);

	if (ret != 0) {
		char *alias_from = principal->name.name_string.val[0];
		char *alias_to;
		Principal alias_principal;
		
		/* Try again with a servicePrincipal alias */
		if (ent_type != HDB_LDB_ENT_TYPE_SERVER && ent_type != HDB_LDB_ENT_TYPE_ANY) {
			talloc_free(mem_ctx);
			return ret;
		}
		if (principal->name.name_string.len < 2) {
			krb5_warnx(context, "LDB_fetch: could not find principal in DB, alias not applicable");
			krb5_set_error_string(context, "LDB_fetch: could not find principal in DB, alias not applicable");
			talloc_free(mem_ctx);
			return ret;
		}

		/* Look for the list of aliases */
		ret = LDB_lookup_spn_alias(context, 
					   (struct ldb_context *)db->hdb_db, mem_ctx, 
					   realm_dn, alias_from, 
					   &alias_to);
		if (ret != 0) {
			talloc_free(mem_ctx);
			return ret;
		}

		ret = copy_Principal(principal, &alias_principal);
		if (ret != 0) {
			krb5_warnx(context, "LDB_fetch: could not copy principal");
			krb5_set_error_string(context, "LDB_fetch: could not copy principal");
			talloc_free(mem_ctx);
			return ret;
		}

		/* ooh, very nasty playing around in the Principal... */
		free(alias_principal.name.name_string.val[0]);
		alias_principal.name.name_string.val[0] = strdup(alias_to);
		if (!alias_principal.name.name_string.val[0]) {
			krb5_warnx(context, "LDB_fetch: strdup() failed");
			krb5_set_error_string(context, "LDB_fetch: strdup() failed");
			ret = ENOMEM;
			talloc_free(mem_ctx);
			free_Principal(&alias_principal);
			return ret;
		}

		ret = LDB_lookup_principal(context, (struct ldb_context *)db->hdb_db, 
					   mem_ctx, 
					   &alias_principal, ent_type, realm_dn, &msg);
		free_Principal(&alias_principal);

		if (ret != 0) {
			krb5_warnx(context, "LDB_fetch: could not find alias principal in DB");
			krb5_set_error_string(context, "LDB_fetch: could not find alias principal in DB");
			talloc_free(mem_ctx);
			return ret;
		}

	}
	if (ret == 0) {
		ret = LDB_message2entry(context, db, mem_ctx, 
					principal, ldb_ent_type, 
					realm_msg[0], msg[0], entry);
		if (ret != 0) {
			krb5_warnx(context, "LDB_fetch: message2entry failed\n");	
		}
	}

	talloc_free(mem_ctx);
	return ret;
}

static krb5_error_code LDB_store(krb5_context context, HDB *db, unsigned flags, hdb_entry *entry)
{
	return HDB_ERR_DB_INUSE;
}

static krb5_error_code LDB_remove(krb5_context context, HDB *db, hdb_entry *entry)
{
	return HDB_ERR_DB_INUSE;
}

struct hdb_ldb_seq {
	struct ldb_context *ctx;
	int index;
	int count;
	struct ldb_message **msgs;
	struct ldb_message **realm_msgs;
};

static krb5_error_code LDB_seq(krb5_context context, HDB *db, unsigned flags, hdb_entry *entry)
{
	krb5_error_code ret;
	struct hdb_ldb_seq *priv = (struct hdb_ldb_seq *)db->hdb_openp;
	TALLOC_CTX *mem_ctx;
	if (!priv) {
		return HDB_ERR_NOENTRY;
	}

	mem_ctx = talloc_named(priv, 0, "LDB_seq context");

	if (!mem_ctx) {
		krb5_set_error_string(context, "LDB_seq: talloc_named() failed!");
		return ENOMEM;
	}

	if (priv->index < priv->count) {
		ret = LDB_message2entry(context, db, mem_ctx, 
					NULL, HDB_LDB_ENT_TYPE_ANY, 
					priv->realm_msgs[0], priv->msgs[priv->index++], entry);
	} else {
		ret = HDB_ERR_NOENTRY;
	}

	if (ret != 0) {
		talloc_free(priv);
		db->hdb_openp = NULL;
	} else {
		talloc_free(mem_ctx);
	}

	return ret;
}

static krb5_error_code LDB_firstkey(krb5_context context, HDB *db, unsigned flags,
					hdb_entry *entry)
{
	struct ldb_context *ldb_ctx = (struct ldb_context *)db->hdb_db;
	struct hdb_ldb_seq *priv = (struct hdb_ldb_seq *)db->hdb_openp;
	char *realm;
	char *realm_dn = NULL;
	struct ldb_message **msgs = NULL;
	struct ldb_message **realm_msgs = NULL;
	krb5_error_code ret;
	TALLOC_CTX *mem_ctx;

	if (priv) {
		talloc_free(priv);
		db->hdb_openp = 0;
	}

	priv = (struct hdb_ldb_seq *) talloc(db, struct hdb_ldb_seq);
	if (!priv) {
		krb5_set_error_string(context, "talloc: out of memory");
		return ENOMEM;
	}

	priv->ctx = ldb_ctx;
	priv->index = 0;
	priv->msgs = NULL;
	priv->realm_msgs = NULL;
	priv->count = 0;

	mem_ctx = talloc_named(priv, 0, "LDB_firstkey context");

	if (!mem_ctx) {
		krb5_set_error_string(context, "LDB_firstkey: talloc_named() failed!");
		return ENOMEM;
	}

	ret = krb5_get_default_realm(context, &realm);
	if (ret != 0) {
		talloc_free(priv);
		return ret;
	}
		
	ret = LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db, 
			       mem_ctx, realm, &realm_msgs);

	free(realm);

	if (ret != 0) {
		talloc_free(priv);
		krb5_warnx(context, "LDB_firstkey: could not find realm\n");
		return HDB_ERR_NOENTRY;
	}

	realm_dn = realm_msgs[0]->dn;

	priv->realm_msgs = talloc_steal(priv, realm_msgs);

	krb5_warnx(context, "LDB_firstkey: realm ok\n");

	priv->count = ldb_search(ldb_ctx, realm_dn,
				 LDB_SCOPE_SUBTREE, "(objectClass=user)",
				 krb5_attrs, &msgs);

	priv->msgs = talloc_steal(priv, msgs);

	if (priv->count <= 0) {
		talloc_free(priv);
		return HDB_ERR_NOENTRY;
	}

	db->hdb_openp = priv;

	ret = LDB_seq(context, db, flags, entry);
	
	if (ret != 0) {
    		talloc_free(priv);
		db->hdb_openp = NULL;
	} else {
		talloc_free(mem_ctx);
	}
	return ret;
}

static krb5_error_code LDB_nextkey(krb5_context context, HDB *db, unsigned flags,
					hdb_entry *entry)
{
	return LDB_seq(context, db, flags, entry);
}

static krb5_error_code LDB_destroy(krb5_context context, HDB *db)
{
	talloc_free(db);
	return 0;
}

krb5_error_code hdb_ldb_create(TALLOC_CTX *mem_ctx, 
			       krb5_context context, struct HDB **db, const char *arg)
{
	*db = talloc(mem_ctx, HDB);
	if (!*db) {
		krb5_set_error_string(context, "malloc: out of memory");
		return ENOMEM;
	}

	(*db)->hdb_master_key_set = 0;
	(*db)->hdb_db = NULL;

	/* Setup the link to LDB */
	(*db)->hdb_db = samdb_connect(db);
	if ((*db)->hdb_db == NULL) {
		krb5_warnx(context, "hdb_ldb_create: samdb_connect failed!");
		krb5_set_error_string(context, "samdb_connect failed!");
		talloc_free(*db);
		return HDB_ERR_NOENTRY;
	}

	(*db)->hdb_openp = 0;
	(*db)->hdb_open = LDB_open;
	(*db)->hdb_close = LDB_close;
	(*db)->hdb_fetch = LDB_fetch;
	(*db)->hdb_store = LDB_store;
	(*db)->hdb_remove = LDB_remove;
	(*db)->hdb_firstkey = LDB_firstkey;
	(*db)->hdb_nextkey = LDB_nextkey;
	(*db)->hdb_lock = LDB_lock;
	(*db)->hdb_unlock = LDB_unlock;
	(*db)->hdb_rename = LDB_rename;
	/* we don't implement these, as we are not a lockable database */
	(*db)->hdb__get = NULL;
	(*db)->hdb__put = NULL;
	/* kadmin should not be used for deletes - use other tools instead */
	(*db)->hdb__del = NULL;
	(*db)->hdb_destroy = LDB_destroy;

	return 0;
}