4 Copyright (C) Nadezhda Ivanova 2010
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 * Description: utility functions for access checking on objects
25 * Authors: Nadezhda Ivanova
30 #include "ldb_module.h"
31 #include "ldb_errors.h"
32 #include "libcli/security/security.h"
33 #include "librpc/gen_ndr/ndr_security.h"
34 #include "libcli/ldap/ldap_ndr.h"
35 #include "param/param.h"
36 #include "auth/auth.h"
37 #include "dsdb/samdb/samdb.h"
38 #include "dsdb/common/util.h"
40 void dsdb_acl_debug(struct security_descriptor
*sd
,
41 struct security_token
*token
,
47 DEBUG(level
, ("Access on %s denied\n", ldb_dn_get_linearized(dn
)));
49 DEBUG(level
, ("Access on %s granted\n", ldb_dn_get_linearized(dn
)));
52 DEBUG(level
,("Security context: %s\n",
53 ndr_print_struct_string(0,(ndr_print_fn_t
)ndr_print_security_token
,"", token
)));
54 DEBUG(level
,("Security descriptor: %s\n",
55 ndr_print_struct_string(0,(ndr_print_fn_t
)ndr_print_security_descriptor
,"", sd
)));
58 int dsdb_get_sd_from_ldb_message(struct ldb_context
*ldb
,
60 struct ldb_message
*acl_res
,
61 struct security_descriptor
**sd
)
63 struct ldb_message_element
*sd_element
;
64 enum ndr_err_code ndr_err
;
66 sd_element
= ldb_msg_find_element(acl_res
, "nTSecurityDescriptor");
67 if (sd_element
== NULL
) {
68 return ldb_error(ldb
, LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS
,
69 "nTSecurityDescriptor is missing");
71 *sd
= talloc(mem_ctx
, struct security_descriptor
);
75 ndr_err
= ndr_pull_struct_blob(&sd_element
->values
[0], *sd
, *sd
,
76 (ndr_pull_flags_fn_t
)ndr_pull_security_descriptor
);
78 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err
)) {
80 return ldb_operr(ldb
);
86 int dsdb_check_access_on_dn_internal(struct ldb_context
*ldb
,
87 struct ldb_result
*acl_res
,
89 struct security_token
*token
,
92 const struct GUID
*guid
)
94 struct security_descriptor
*sd
= NULL
;
95 struct dom_sid
*sid
= NULL
;
96 struct object_tree
*root
= NULL
;
98 uint32_t access_granted
;
101 ret
= dsdb_get_sd_from_ldb_message(ldb
, mem_ctx
, acl_res
->msgs
[0], &sd
);
102 if (ret
!= LDB_SUCCESS
) {
103 return ldb_operr(ldb
);
106 sid
= samdb_result_dom_sid(mem_ctx
, acl_res
->msgs
[0], "objectSid");
108 if (!insert_in_object_tree(mem_ctx
, guid
, access_mask
, NULL
,
112 return ldb_operr(ldb
);
115 status
= sec_access_check_ds(sd
, token
,
120 if (!NT_STATUS_IS_OK(status
)) {
126 ldb_asprintf_errstring(ldb
,
127 "dsdb_access: Access check failed on %s",
128 ldb_dn_get_linearized(dn
));
131 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS
;
136 /* performs an access check from outside the module stack
137 * given the dn of the object to be checked, the required access
138 * guid is either the guid of the extended right, or NULL
141 int dsdb_check_access_on_dn(struct ldb_context
*ldb
,
144 struct security_token
*token
,
145 uint32_t access_mask
,
146 const char *ext_right
)
150 struct ldb_result
*acl_res
;
151 static const char *acl_attrs
[] = {
152 "nTSecurityDescriptor",
157 if (ext_right
!= NULL
) {
158 NTSTATUS status
= GUID_from_string(ext_right
, &guid
);
159 if (!NT_STATUS_IS_OK(status
)) {
160 return LDB_ERR_OPERATIONS_ERROR
;
165 * We need AS_SYSTEM in order to get the nTSecurityDescriptor attribute.
166 * Also the result of this search not controlled by the client
167 * nor is the result exposed to the client.
169 ret
= dsdb_search_dn(ldb
, mem_ctx
, &acl_res
, dn
, acl_attrs
,
170 DSDB_FLAG_AS_SYSTEM
| DSDB_SEARCH_SHOW_RECYCLED
);
171 if (ret
!= LDB_SUCCESS
) {
172 DEBUG(10,("access_check: failed to find object %s\n", ldb_dn_get_linearized(dn
)));
176 return dsdb_check_access_on_dn_internal(ldb
, acl_res
,
181 ext_right
? &guid
: NULL
);