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
->access_mask
= ace_src
->access_mask
;
50 ace_dest
->obj_flags
= ace_src
->obj_flags
;
51 memcpy(&ace_dest
->obj_guid
, &ace_src
->obj_guid
, sizeof(struct GUID
));
52 memcpy(&ace_dest
->inh_guid
, &ace_src
->inh_guid
, sizeof(struct GUID
));
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;
65 t
->access_mask
= mask
;
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
].access_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
].access_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
;
128 if((pp_new
[0] = TALLOC_ZERO_ARRAY(ctx
, SEC_ACE
, *num
)) == 0)
129 return NT_STATUS_NO_MEMORY
;
134 for (i
= 0; i
< *num
; i
++) {
135 if (sid_compare(&old
[i
].trustee
, sid
) != 0)
136 sec_ace_copy(&(*pp_new
)[i
], &old
[i
]);
141 return NT_STATUS_NOT_FOUND
;
148 /*******************************************************************
149 Compares two SEC_ACE structures
150 ********************************************************************/
152 BOOL
sec_ace_equal(SEC_ACE
*s1
, SEC_ACE
*s2
)
164 /* Check top level stuff */
166 if (s1
->type
!= s2
->type
|| s1
->flags
!= s2
->flags
||
167 s1
->access_mask
!= s2
->access_mask
) {
173 if (!sid_equal(&s1
->trustee
, &s2
->trustee
)) {
180 int nt_ace_inherit_comp( SEC_ACE
*a1
, SEC_ACE
*a2
)
182 int a1_inh
= a1
->flags
& SEC_ACE_FLAG_INHERITED_ACE
;
183 int a2_inh
= a2
->flags
& SEC_ACE_FLAG_INHERITED_ACE
;
185 if (a1_inh
== a2_inh
)
188 if (!a1_inh
&& a2_inh
)
193 /*******************************************************************
194 Comparison function to apply the order explained below in a group.
195 *******************************************************************/
197 int nt_ace_canon_comp( SEC_ACE
*a1
, SEC_ACE
*a2
)
199 if ((a1
->type
== SEC_ACE_TYPE_ACCESS_DENIED
) &&
200 (a2
->type
!= SEC_ACE_TYPE_ACCESS_DENIED
))
203 if ((a2
->type
== SEC_ACE_TYPE_ACCESS_DENIED
) &&
204 (a1
->type
!= SEC_ACE_TYPE_ACCESS_DENIED
))
207 /* Both access denied or access allowed. */
209 /* 1. ACEs that apply to the object itself */
211 if (!(a1
->flags
& SEC_ACE_FLAG_INHERIT_ONLY
) &&
212 (a2
->flags
& SEC_ACE_FLAG_INHERIT_ONLY
))
214 else if (!(a2
->flags
& SEC_ACE_FLAG_INHERIT_ONLY
) &&
215 (a1
->flags
& SEC_ACE_FLAG_INHERIT_ONLY
))
218 /* 2. ACEs that apply to a subobject of the object, such as
219 * a property set or property. */
221 if (a1
->flags
& (SEC_ACE_FLAG_CONTAINER_INHERIT
|SEC_ACE_FLAG_OBJECT_INHERIT
) &&
222 !(a2
->flags
& (SEC_ACE_FLAG_CONTAINER_INHERIT
|SEC_ACE_FLAG_OBJECT_INHERIT
)))
224 else if (a2
->flags
& (SEC_ACE_FLAG_CONTAINER_INHERIT
|SEC_ACE_FLAG_OBJECT_INHERIT
) &&
225 !(a1
->flags
& (SEC_ACE_FLAG_CONTAINER_INHERIT
|SEC_ACE_FLAG_OBJECT_INHERIT
)))
231 /*******************************************************************
232 Functions to convert a SEC_DESC ACE DACL list into canonical order.
235 --- from http://msdn.microsoft.com/library/default.asp?url=/library/en-us/security/security/order_of_aces_in_a_dacl.asp
237 The following describes the preferred order:
239 To ensure that noninherited ACEs have precedence over inherited ACEs,
240 place all noninherited ACEs in a group before any inherited ACEs.
241 This ordering ensures, for example, that a noninherited access-denied ACE
242 is enforced regardless of any inherited ACE that allows access.
244 Within the groups of noninherited ACEs and inherited ACEs, order ACEs according to ACE type, as the following shows:
245 1. Access-denied ACEs that apply to the object itself
246 2. Access-denied ACEs that apply to a subobject of the object, such as a property set or property
247 3. Access-allowed ACEs that apply to the object itself
248 4. Access-allowed ACEs that apply to a subobject of the object"
250 ********************************************************************/
252 void dacl_sort_into_canonical_order(SEC_ACE
*srclist
, unsigned int num_aces
)
256 if (!srclist
|| num_aces
== 0)
259 /* Sort so that non-inherited ACE's come first. */
260 qsort( srclist
, num_aces
, sizeof(srclist
[0]), QSORT_CAST nt_ace_inherit_comp
);
262 /* Find the boundary between non-inherited ACEs. */
263 for (i
= 0; i
< num_aces
; i
++ ) {
264 SEC_ACE
*curr_ace
= &srclist
[i
];
266 if (curr_ace
->flags
& SEC_ACE_FLAG_INHERITED_ACE
)
270 /* i now points at entry number of the first inherited ACE. */
272 /* Sort the non-inherited ACEs. */
274 qsort( srclist
, i
, sizeof(srclist
[0]), QSORT_CAST nt_ace_canon_comp
);
276 /* Now sort the inherited ACEs. */
278 qsort( &srclist
[i
], num_aces
- i
, sizeof(srclist
[0]), QSORT_CAST nt_ace_canon_comp
);
281 /*******************************************************************
282 Check if this ACE has a SID in common with the token.
283 ********************************************************************/
285 BOOL
token_sid_in_ace(const NT_USER_TOKEN
*token
, const SEC_ACE
*ace
)
289 for (i
= 0; i
< token
->num_sids
; i
++) {
290 if (sid_equal(&ace
->trustee
, &token
->user_sids
[i
]))