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
|
/*
Unix SMB/Netbios implementation.
Version 3.0
ads (active directory) utility library
Copyright (C) Andrew Tridgell 2001
Copyright (C) Remus Koos 2001
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#ifdef HAVE_ADS
/*
build a ADS_STATUS structure
*/
ADS_STATUS ads_build_error(enum ads_error_type etype,
int rc, int minor_status)
{
ADS_STATUS ret;
ret.error_type = etype;
ret.rc = rc;
ret.minor_status = minor_status;
return ret;
}
/*
do a rough conversion between ads error codes and NT status codes
we'll need to fill this in more
*/
NTSTATUS ads_ntstatus(ADS_STATUS rc)
{
if (ADS_ERR_OK(rc)) return NT_STATUS_OK;
return NT_STATUS_UNSUCCESSFUL;
}
/*
return a string for an error from a ads routine
*/
const char *ads_errstr(ADS_STATUS status)
{
gss_buffer_desc msg1, msg2;
uint32 minor;
int msg_ctx;
static char *ret;
SAFE_FREE(ret);
msg_ctx = 0;
switch (status.error_type) {
case ADS_ERROR_KRB5:
return error_message(status.rc);
case ADS_ERROR_LDAP:
return ldap_err2string(status.rc);
case ADS_ERROR_SYSTEM:
return strerror(status.rc);
case ADS_ERROR_GSS:
msg1.value = NULL;
msg2.value = NULL;
gss_display_status(&minor, status.rc, GSS_C_GSS_CODE,
GSS_C_NULL_OID, &msg_ctx, &msg1);
gss_display_status(&minor, status.minor_status, GSS_C_MECH_CODE,
GSS_C_NULL_OID, &msg_ctx, &msg2);
asprintf(&ret, "%s : %s", (char *)msg1.value, (char *)msg2.value);
gss_release_buffer(&minor, &msg1);
gss_release_buffer(&minor, &msg2);
return ret;
}
return "Unknown ADS error type!?";
}
/*
connect to the LDAP server
*/
ADS_STATUS ads_connect(ADS_STRUCT *ads)
{
int version = LDAP_VERSION3;
ADS_STATUS status;
ads->last_attempt = time(NULL);
ads->ld = ldap_open(ads->ldap_server, ads->ldap_port);
if (!ads->ld) {
return ADS_ERROR_SYSTEM(errno)
}
status = ads_server_info(ads);
if (!ADS_ERR_OK(status)) {
DEBUG(1,("Failed to get ldap server info\n"));
return status;
}
ldap_set_option(ads->ld, LDAP_OPT_PROTOCOL_VERSION, &version);
if (ads->password) {
ads_kinit_password(ads);
}
return ads_sasl_bind(ads);
}
/*
do a search with a timeout
*/
ADS_STATUS ads_do_search(ADS_STRUCT *ads, const char *bind_path, int scope,
const char *exp,
const char **attrs, void **res)
{
struct timeval timeout;
int rc;
timeout.tv_sec = ADS_SEARCH_TIMEOUT;
timeout.tv_usec = 0;
*res = NULL;
rc = ldap_search_ext_s(ads->ld,
bind_path, scope,
exp, attrs, 0, NULL, NULL,
&timeout, LDAP_NO_LIMIT, (LDAPMessage **)res);
return ADS_ERROR(rc);
}
/*
do a general ADS search
*/
ADS_STATUS ads_search(ADS_STRUCT *ads, void **res,
const char *exp,
const char **attrs)
{
return ads_do_search(ads, ads->bind_path, LDAP_SCOPE_SUBTREE,
exp, attrs, res);
}
/*
do a search on a specific DistinguishedName
*/
ADS_STATUS ads_search_dn(ADS_STRUCT *ads, void **res,
const char *dn,
const char **attrs)
{
return ads_do_search(ads, dn, LDAP_SCOPE_BASE, "(objectclass=*)", attrs, res);
}
/*
free up memory from a ads_search
*/
void ads_msgfree(ADS_STRUCT *ads, void *msg)
{
if (!msg) return;
ldap_msgfree(msg);
}
/*
find a machine account given a hostname
*/
ADS_STATUS ads_find_machine_acct(ADS_STRUCT *ads, void **res, const char *host)
{
ADS_STATUS status;
char *exp;
/* the easiest way to find a machine account anywhere in the tree
is to look for hostname$ */
asprintf(&exp, "(samAccountName=%s$)", host);
status = ads_search(ads, res, exp, NULL);
free(exp);
return status;
}
/*
a convenient routine for adding a generic LDAP record
*/
ADS_STATUS ads_gen_add(ADS_STRUCT *ads, const char *new_dn, ...)
{
int i;
va_list ap;
LDAPMod **mods;
char *name, *value;
int ret;
#define MAX_MOD_VALUES 10
/* count the number of attributes */
va_start(ap, new_dn);
for (i=0; va_arg(ap, char *); i++) {
/* skip the values */
while (va_arg(ap, char *)) ;
}
va_end(ap);
mods = malloc(sizeof(LDAPMod *) * (i+1));
va_start(ap, new_dn);
for (i=0; (name=va_arg(ap, char *)); i++) {
char **values;
int j;
values = (char **)malloc(sizeof(char *) * (MAX_MOD_VALUES+1));
for (j=0; (value=va_arg(ap, char *)) && j < MAX_MOD_VALUES; j++) {
values[j] = value;
}
values[j] = NULL;
mods[i] = malloc(sizeof(LDAPMod));
mods[i]->mod_type = name;
mods[i]->mod_op = LDAP_MOD_ADD;
mods[i]->mod_values = values;
}
mods[i] = NULL;
va_end(ap);
ret = ldap_add_s(ads->ld, new_dn, mods);
for (i=0; mods[i]; i++) {
free(mods[i]->mod_values);
free(mods[i]);
}
free(mods);
return ADS_ERROR(ret);
}
/*
add a machine account to the ADS server
*/
static ADS_STATUS ads_add_machine_acct(ADS_STRUCT *ads, const char *hostname,
const char *org_unit)
{
ADS_STATUS ret;
char *host_spn, *host_upn, *new_dn, *samAccountName, *controlstr;
asprintf(&host_spn, "HOST/%s", hostname);
asprintf(&host_upn, "%s@%s", host_spn, ads->realm);
asprintf(&new_dn, "cn=%s,cn=%s,%s", hostname, org_unit, ads->bind_path);
asprintf(&samAccountName, "%s$", hostname);
asprintf(&controlstr, "%u",
UF_DONT_EXPIRE_PASSWD | UF_WORKSTATION_TRUST_ACCOUNT |
UF_TRUSTED_FOR_DELEGATION | UF_USE_DES_KEY_ONLY);
ret = ads_gen_add(ads, new_dn,
"cn", hostname, NULL,
"sAMAccountName", samAccountName, NULL,
"objectClass",
"top", "person", "organizationalPerson",
"user", "computer", NULL,
"userPrincipalName", host_upn, NULL,
"servicePrincipalName", host_spn, NULL,
"dNSHostName", hostname, NULL,
"userAccountControl", controlstr, NULL,
"operatingSystem", "Samba", NULL,
"operatingSystemVersion", VERSION, NULL,
NULL);
free(host_spn);
free(host_upn);
free(new_dn);
free(samAccountName);
free(controlstr);
return ret;
}
/*
dump a binary result from ldap
*/
static void dump_binary(const char *field, struct berval **values)
{
int i, j;
for (i=0; values[i]; i++) {
printf("%s: ", field);
for (j=0; j<values[i]->bv_len; j++) {
printf("%02X", (unsigned char)values[i]->bv_val[j]);
}
printf("\n");
}
}
/*
dump a sid result from ldap
*/
static void dump_sid(const char *field, struct berval **values)
{
int i;
for (i=0; values[i]; i++) {
DOM_SID sid;
sid_parse(values[i]->bv_val, values[i]->bv_len, &sid);
printf("%s: %s\n", field, sid_string_static(&sid));
}
}
/*
dump a string result from ldap
*/
static void dump_string(const char *field, struct berval **values)
{
int i;
for (i=0; values[i]; i++) {
printf("%s: %s\n", field, values[i]->bv_val);
}
}
/*
dump a record from LDAP on stdout
used for debugging
*/
void ads_dump(ADS_STRUCT *ads, void *res)
{
char *field;
void *msg;
BerElement *b;
struct {
char *name;
void (*handler)(const char *, struct berval **);
} handlers[] = {
{"objectGUID", dump_binary},
{"objectSid", dump_sid},
{NULL, NULL}
};
for (msg = ads_first_entry(ads, res); msg; msg = ads_next_entry(ads, msg)) {
for (field = ldap_first_attribute(ads->ld, (LDAPMessage *)msg, &b);
field;
field = ldap_next_attribute(ads->ld, (LDAPMessage *)msg, b)) {
struct berval **values;
int i;
values = ldap_get_values_len(ads->ld, (LDAPMessage *)msg, field);
for (i=0; handlers[i].name; i++) {
if (StrCaseCmp(handlers[i].name, field) == 0) {
handlers[i].handler(field, values);
break;
}
}
if (!handlers[i].name) {
dump_string(field, values);
}
ldap_value_free_len(values);
ldap_memfree(field);
}
ber_free(b, 1);
printf("\n");
}
}
/*
count how many replies are in a LDAPMessage
*/
int ads_count_replies(ADS_STRUCT *ads, void *res)
{
return ldap_count_entries(ads->ld, (LDAPMessage *)res);
}
/*
join a machine to a realm, creating the machine account
and setting the machine password
*/
ADS_STATUS ads_join_realm(ADS_STRUCT *ads, const char *hostname, const char *org_unit)
{
ADS_STATUS status;
LDAPMessage *res;
char *host;
/* hostname must be lowercase */
host = strdup(hostname);
strlower(host);
status = ads_find_machine_acct(ads, (void **)&res, host);
if (ADS_ERR_OK(status) && ads_count_replies(ads, res) == 1) {
DEBUG(0, ("Host account for %s already exists\n", host));
return ADS_SUCCESS;
}
status = ads_add_machine_acct(ads, host, org_unit);
if (!ADS_ERR_OK(status)) {
DEBUG(0, ("ads_add_machine_acct: %s\n", ads_errstr(status)));
return status;
}
status = ads_find_machine_acct(ads, (void **)&res, host);
if (!ADS_ERR_OK(status)) {
DEBUG(0, ("Host account test failed\n"));
return status;
}
free(host);
return status;
}
/*
delete a machine from the realm
*/
ADS_STATUS ads_leave_realm(ADS_STRUCT *ads, const char *hostname)
{
ADS_STATUS status;
void *res;
char *hostnameDN, *host;
int rc;
/* hostname must be lowercase */
host = strdup(hostname);
strlower(host);
status = ads_find_machine_acct(ads, &res, host);
if (!ADS_ERR_OK(status)) {
DEBUG(0, ("Host account for %s does not exist.\n", host));
return status;
}
hostnameDN = ldap_get_dn(ads->ld, (LDAPMessage *)res);
rc = ldap_delete_s(ads->ld, hostnameDN);
ldap_memfree(hostnameDN);
if (rc != LDAP_SUCCESS) {
return ADS_ERROR(rc);
}
status = ads_find_machine_acct(ads, &res, host);
if (ADS_ERR_OK(status) && ads_count_replies(ads, res) == 1) {
DEBUG(0, ("Failed to remove host account.\n"));
return status;
}
free(host);
return status;
}
ADS_STATUS ads_set_machine_password(ADS_STRUCT *ads,
const char *hostname,
const char *password)
{
ADS_STATUS status;
char *host = strdup(hostname);
char *principal;
strlower(host);
asprintf(&principal, "%s@%s", host, ads->realm);
status = krb5_set_password(ads->kdc_server, principal, password);
free(host);
free(principal);
return status;
}
/*
pull the first entry from a ADS result
*/
void *ads_first_entry(ADS_STRUCT *ads, void *res)
{
return (void *)ldap_first_entry(ads->ld, (LDAPMessage *)res);
}
/*
pull the next entry from a ADS result
*/
void *ads_next_entry(ADS_STRUCT *ads, void *res)
{
return (void *)ldap_next_entry(ads->ld, (LDAPMessage *)res);
}
/*
pull a single string from a ADS result
*/
char *ads_pull_string(ADS_STRUCT *ads,
TALLOC_CTX *mem_ctx, void *msg, const char *field)
{
char **values;
char *ret = NULL;
values = ldap_get_values(ads->ld, msg, field);
if (!values) return NULL;
if (values[0]) {
ret = talloc_strdup(mem_ctx, values[0]);
}
ldap_value_free(values);
return ret;
}
/*
pull a single uint32 from a ADS result
*/
BOOL ads_pull_uint32(ADS_STRUCT *ads,
void *msg, const char *field, uint32 *v)
{
char **values;
values = ldap_get_values(ads->ld, msg, field);
if (!values) return False;
if (!values[0]) {
ldap_value_free(values);
return False;
}
*v = atoi(values[0]);
ldap_value_free(values);
return True;
}
/*
pull a single DOM_SID from a ADS result
*/
BOOL ads_pull_sid(ADS_STRUCT *ads,
void *msg, const char *field, DOM_SID *sid)
{
struct berval **values;
BOOL ret = False;
values = ldap_get_values_len(ads->ld, msg, field);
if (!values) return False;
if (values[0]) {
ret = sid_parse(values[0]->bv_val, values[0]->bv_len, sid);
}
ldap_value_free_len(values);
return ret;
}
/*
pull an array of DOM_SIDs from a ADS result
return the count of SIDs pulled
*/
int ads_pull_sids(ADS_STRUCT *ads, TALLOC_CTX *mem_ctx,
void *msg, const char *field, DOM_SID **sids)
{
struct berval **values;
BOOL ret;
int count, i;
values = ldap_get_values_len(ads->ld, msg, field);
if (!values) return 0;
for (i=0; values[i]; i++) /* nop */ ;
(*sids) = talloc(mem_ctx, sizeof(DOM_SID) * i);
count = 0;
for (i=0; values[i]; i++) {
ret = sid_parse(values[i]->bv_val, values[i]->bv_len, &(*sids)[count]);
if (ret) count++;
}
ldap_value_free_len(values);
return count;
}
/* find the update serial number - this is the core of the ldap cache */
ADS_STATUS ads_USN(ADS_STRUCT *ads, uint32 *usn)
{
const char *attrs[] = {"highestCommittedUSN", NULL};
ADS_STATUS status;
void *res;
status = ads_do_search(ads, "", LDAP_SCOPE_BASE, "(objectclass=*)", attrs, &res);
if (!ADS_ERR_OK(status)) return status;
if (ads_count_replies(ads, res) != 1) {
return ADS_ERROR(LDAP_NO_RESULTS_RETURNED);
}
ads_pull_uint32(ads, res, "highestCommittedUSN", usn);
ads_msgfree(ads, res);
return ADS_SUCCESS;
}
/* find the servers name and realm - this can be done before authentication
The ldapServiceName field on w2k looks like this:
vnet3.home.samba.org:win2000-vnet3$@VNET3.HOME.SAMBA.ORG
*/
ADS_STATUS ads_server_info(ADS_STRUCT *ads)
{
const char *attrs[] = {"ldapServiceName", NULL};
ADS_STATUS status;
void *res;
char **values;
char *p;
status = ads_do_search(ads, "", LDAP_SCOPE_BASE, "(objectclass=*)", attrs, &res);
if (!ADS_ERR_OK(status)) return status;
values = ldap_get_values(ads->ld, res, "ldapServiceName");
if (!values || !values[0]) return ADS_ERROR(LDAP_NO_RESULTS_RETURNED);
p = strchr(values[0], ':');
if (!p) {
ldap_value_free(values);
ldap_msgfree(res);
return ADS_ERROR(LDAP_DECODING_ERROR);
}
SAFE_FREE(ads->ldap_server_name);
ads->ldap_server_name = strdup(p+1);
p = strchr(ads->ldap_server_name, '$');
if (!p || p[1] != '@') {
ldap_value_free(values);
ldap_msgfree(res);
SAFE_FREE(ads->ldap_server_name);
return ADS_ERROR(LDAP_DECODING_ERROR);
}
*p = 0;
SAFE_FREE(ads->server_realm);
SAFE_FREE(ads->bind_path);
ads->server_realm = strdup(p+2);
ads->bind_path = ads_build_dn(ads->server_realm);
/* in case the realm isn't configured in smb.conf */
if (!ads->realm || !ads->realm[0]) {
SAFE_FREE(ads->realm);
ads->realm = strdup(ads->server_realm);
}
DEBUG(3,("got ldap server name %s@%s\n",
ads->ldap_server_name, ads->realm));
return ADS_SUCCESS;
}
/*
find the list of trusted domains
*/
ADS_STATUS ads_trusted_domains(ADS_STRUCT *ads, TALLOC_CTX *mem_ctx,
int *num_trusts, char ***names, DOM_SID **sids)
{
const char *attrs[] = {"flatName", "securityIdentifier", NULL};
ADS_STATUS status;
void *res, *msg;
int count, i;
*num_trusts = 0;
status = ads_search(ads, &res, "(objectcategory=trustedDomain)", attrs);
if (!ADS_ERR_OK(status)) return status;
count = ads_count_replies(ads, res);
if (count == 0) {
ads_msgfree(ads, res);
return ADS_ERROR(LDAP_NO_RESULTS_RETURNED);
}
(*names) = talloc(mem_ctx, sizeof(char *) * count);
(*sids) = talloc(mem_ctx, sizeof(DOM_SID) * count);
if (! *names || ! *sids) return ADS_ERROR(LDAP_NO_MEMORY);
for (i=0, msg = ads_first_entry(ads, res); msg; msg = ads_next_entry(ads, msg)) {
(*names)[i] = ads_pull_string(ads, mem_ctx, msg, "flatName");
ads_pull_sid(ads, msg, "securityIdentifier", &(*sids)[i]);
i++;
}
ads_msgfree(ads, res);
*num_trusts = i;
return ADS_SUCCESS;
}
/* find the domain sid for our domain */
ADS_STATUS ads_domain_sid(ADS_STRUCT *ads, DOM_SID *sid)
{
const char *attrs[] = {"objectSid", NULL};
void *res;
ADS_STATUS rc;
rc = ads_do_search(ads, ads->bind_path, LDAP_SCOPE_BASE, "(objectclass=*)",
attrs, &res);
if (!ADS_ERR_OK(rc)) return rc;
if (!ads_pull_sid(ads, res, "objectSid", sid)) {
return ADS_ERROR_SYSTEM(ENOENT);
}
ads_msgfree(ads, res);
return ADS_SUCCESS;
}
#endif
|