2 * Unix SMB/Netbios implementation.
3 * SEC_ACE handling functions
4 * Copyright (C) Andrew Tridgell 1992-1998,
5 * Copyright (C) Jeremy R. Allison 1995-2003.
6 * Copyright (C) Luke Kenneth Casson Leighton 1996-1998,
7 * Copyright (C) Paul Ashton 1997-1998.
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 2 of the License, or
12 * (at your option) any later version.
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.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 /*******************************************************************
27 Check if ACE has OBJECT type.
28 ********************************************************************/
30 BOOL
sec_ace_object(uint8 type
)
32 if (type
== SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT
||
33 type
== SEC_ACE_TYPE_ACCESS_DENIED_OBJECT
||
34 type
== SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT
||
35 type
== SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT
) {
41 /*******************************************************************
42 copy a SEC_ACE structure.
43 ********************************************************************/
44 void sec_ace_copy(SEC_ACE
*ace_dest
, SEC_ACE
*ace_src
)
46 ace_dest
->type
= ace_src
->type
;
47 ace_dest
->flags
= ace_src
->flags
;
48 ace_dest
->size
= ace_src
->size
;
49 ace_dest
->info
.mask
= ace_src
->info
.mask
;
50 ace_dest
->obj_flags
= ace_src
->obj_flags
;
51 memcpy(&ace_dest
->obj_guid
, &ace_src
->obj_guid
, sizeof(struct uuid
));
52 memcpy(&ace_dest
->inh_guid
, &ace_src
->inh_guid
, sizeof(struct uuid
));
53 sid_copy(&ace_dest
->trustee
, &ace_src
->trustee
);
56 /*******************************************************************
57 Sets up a SEC_ACE structure.
58 ********************************************************************/
60 void init_sec_ace(SEC_ACE
*t
, const DOM_SID
*sid
, uint8 type
, SEC_ACCESS mask
, uint8 flag
)
64 t
->size
= sid_size(sid
) + 8;
67 ZERO_STRUCTP(&t
->trustee
);
68 sid_copy(&t
->trustee
, sid
);
71 /*******************************************************************
72 adds new SID with its permissions to ACE list
73 ********************************************************************/
75 NTSTATUS
sec_ace_add_sid(TALLOC_CTX
*ctx
, SEC_ACE
**pp_new
, SEC_ACE
*old
, unsigned *num
, DOM_SID
*sid
, uint32 mask
)
79 if (!ctx
|| !pp_new
|| !old
|| !sid
|| !num
) return NT_STATUS_INVALID_PARAMETER
;
83 if((pp_new
[0] = TALLOC_ZERO_ARRAY(ctx
, SEC_ACE
, *num
)) == 0)
84 return NT_STATUS_NO_MEMORY
;
86 for (i
= 0; i
< *num
- 1; i
++)
87 sec_ace_copy(&(*pp_new
)[i
], &old
[i
]);
89 (*pp_new
)[i
].type
= 0;
90 (*pp_new
)[i
].flags
= 0;
91 (*pp_new
)[i
].size
= SEC_ACE_HEADER_SIZE
+ sid_size(sid
);
92 (*pp_new
)[i
].info
.mask
= mask
;
93 sid_copy(&(*pp_new
)[i
].trustee
, sid
);
97 /*******************************************************************
98 modify SID's permissions at ACL
99 ********************************************************************/
101 NTSTATUS
sec_ace_mod_sid(SEC_ACE
*ace
, size_t num
, DOM_SID
*sid
, uint32 mask
)
105 if (!ace
|| !sid
) return NT_STATUS_INVALID_PARAMETER
;
107 for (i
= 0; i
< num
; i
++) {
108 if (sid_compare(&ace
[i
].trustee
, sid
) == 0) {
109 ace
[i
].info
.mask
= mask
;
113 return NT_STATUS_NOT_FOUND
;
116 /*******************************************************************
118 ********************************************************************/
120 NTSTATUS
sec_ace_del_sid(TALLOC_CTX
*ctx
, SEC_ACE
**pp_new
, SEC_ACE
*old
, uint32
*num
, DOM_SID
*sid
)
123 unsigned int n_del
= 0;
125 if (!ctx
|| !pp_new
|| !old
|| !sid
|| !num
) return NT_STATUS_INVALID_PARAMETER
;
127 if((pp_new
[0] = TALLOC_ZERO_ARRAY(ctx
, SEC_ACE
, *num
)) == 0)
128 return NT_STATUS_NO_MEMORY
;
130 for (i
= 0; i
< *num
; i
++) {
131 if (sid_compare(&old
[i
].trustee
, sid
) != 0)
132 sec_ace_copy(&(*pp_new
)[i
], &old
[i
]);
137 return NT_STATUS_NOT_FOUND
;
144 /*******************************************************************
145 Compares two SEC_ACE structures
146 ********************************************************************/
148 BOOL
sec_ace_equal(SEC_ACE
*s1
, SEC_ACE
*s2
)
152 if (!s1
&& !s2
) return True
;
154 /* Check top level stuff */
156 if (s1
->type
!= s2
->type
|| s1
->flags
!= s2
->flags
||
157 s1
->info
.mask
!= s2
->info
.mask
) {
163 if (!sid_equal(&s1
->trustee
, &s2
->trustee
)) {
170 int nt_ace_inherit_comp( SEC_ACE
*a1
, SEC_ACE
*a2
)
172 int a1_inh
= a1
->flags
& SEC_ACE_FLAG_INHERITED_ACE
;
173 int a2_inh
= a2
->flags
& SEC_ACE_FLAG_INHERITED_ACE
;
175 if (a1_inh
== a2_inh
)
178 if (!a1_inh
&& a2_inh
)
183 /*******************************************************************
184 Comparison function to apply the order explained below in a group.
185 *******************************************************************/
187 int nt_ace_canon_comp( SEC_ACE
*a1
, SEC_ACE
*a2
)
189 if ((a1
->type
== SEC_ACE_TYPE_ACCESS_DENIED
) &&
190 (a2
->type
!= SEC_ACE_TYPE_ACCESS_DENIED
))
193 if ((a2
->type
== SEC_ACE_TYPE_ACCESS_DENIED
) &&
194 (a1
->type
!= SEC_ACE_TYPE_ACCESS_DENIED
))
197 /* Both access denied or access allowed. */
199 /* 1. ACEs that apply to the object itself */
201 if (!(a1
->flags
& SEC_ACE_FLAG_INHERIT_ONLY
) &&
202 (a2
->flags
& SEC_ACE_FLAG_INHERIT_ONLY
))
204 else if (!(a2
->flags
& SEC_ACE_FLAG_INHERIT_ONLY
) &&
205 (a1
->flags
& SEC_ACE_FLAG_INHERIT_ONLY
))
208 /* 2. ACEs that apply to a subobject of the object, such as
209 * a property set or property. */
211 if (a1
->flags
& (SEC_ACE_FLAG_CONTAINER_INHERIT
|SEC_ACE_FLAG_OBJECT_INHERIT
) &&
212 !(a2
->flags
& (SEC_ACE_FLAG_CONTAINER_INHERIT
|SEC_ACE_FLAG_OBJECT_INHERIT
)))
214 else if (a2
->flags
& (SEC_ACE_FLAG_CONTAINER_INHERIT
|SEC_ACE_FLAG_OBJECT_INHERIT
) &&
215 !(a1
->flags
& (SEC_ACE_FLAG_CONTAINER_INHERIT
|SEC_ACE_FLAG_OBJECT_INHERIT
)))
221 /*******************************************************************
222 Functions to convert a SEC_DESC ACE DACL list into canonical order.
225 --- from http://msdn.microsoft.com/library/default.asp?url=/library/en-us/security/security/order_of_aces_in_a_dacl.asp
227 The following describes the preferred order:
229 To ensure that noninherited ACEs have precedence over inherited ACEs,
230 place all noninherited ACEs in a group before any inherited ACEs.
231 This ordering ensures, for example, that a noninherited access-denied ACE
232 is enforced regardless of any inherited ACE that allows access.
234 Within the groups of noninherited ACEs and inherited ACEs, order ACEs according to ACE type, as the following shows:
235 1. Access-denied ACEs that apply to the object itself
236 2. Access-denied ACEs that apply to a subobject of the object, such as a property set or property
237 3. Access-allowed ACEs that apply to the object itself
238 4. Access-allowed ACEs that apply to a subobject of the object"
240 ********************************************************************/
242 void dacl_sort_into_canonical_order(SEC_ACE
*srclist
, unsigned int num_aces
)
246 if (!srclist
|| num_aces
== 0)
249 /* Sort so that non-inherited ACE's come first. */
250 qsort( srclist
, num_aces
, sizeof(srclist
[0]), QSORT_CAST nt_ace_inherit_comp
);
252 /* Find the boundary between non-inherited ACEs. */
253 for (i
= 0; i
< num_aces
; i
++ ) {
254 SEC_ACE
*curr_ace
= &srclist
[i
];
256 if (curr_ace
->flags
& SEC_ACE_FLAG_INHERITED_ACE
)
260 /* i now points at entry number of the first inherited ACE. */
262 /* Sort the non-inherited ACEs. */
264 qsort( srclist
, i
, sizeof(srclist
[0]), QSORT_CAST nt_ace_canon_comp
);
266 /* Now sort the inherited ACEs. */
268 qsort( &srclist
[i
], num_aces
- i
, sizeof(srclist
[0]), QSORT_CAST nt_ace_canon_comp
);
271 /*******************************************************************
272 Check if this ACE has a SID in common with the token.
273 ********************************************************************/
275 BOOL
token_sid_in_ace(const NT_USER_TOKEN
*token
, const SEC_ACE
*ace
)
279 for (i
= 0; i
< token
->num_sids
; i
++) {
280 if (sid_equal(&ace
->trustee
, &token
->user_sids
[i
]))