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 3 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, see <http://www.gnu.org/licenses/>.
25 /*******************************************************************
26 Check if ACE has OBJECT type.
27 ********************************************************************/
29 bool sec_ace_object(uint8 type)
31 if (type == SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT ||
32 type == SEC_ACE_TYPE_ACCESS_DENIED_OBJECT ||
33 type == SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT ||
34 type == SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT) {
40 /*******************************************************************
41 copy a SEC_ACE structure.
42 ********************************************************************/
43 void sec_ace_copy(SEC_ACE *ace_dest, SEC_ACE *ace_src)
45 ace_dest->type = ace_src->type;
46 ace_dest->flags = ace_src->flags;
47 ace_dest->size = ace_src->size;
48 ace_dest->access_mask = ace_src->access_mask;
49 ace_dest->object = ace_src->object;
50 sid_copy(&ace_dest->trustee, &ace_src->trustee);
53 /*******************************************************************
54 Sets up a SEC_ACE structure.
55 ********************************************************************/
57 void init_sec_ace(SEC_ACE *t, const DOM_SID *sid, uint8 type, uint32 mask, uint8 flag)
61 t->size = sid_size(sid) + 8;
62 t->access_mask = mask;
64 ZERO_STRUCTP(&t->trustee);
65 sid_copy(&t->trustee, sid);
68 /*******************************************************************
69 adds new SID with its permissions to ACE list
70 ********************************************************************/
72 NTSTATUS sec_ace_add_sid(TALLOC_CTX *ctx, SEC_ACE **pp_new, SEC_ACE *old, unsigned *num, DOM_SID *sid, uint32 mask)
76 if (!ctx || !pp_new || !old || !sid || !num) return NT_STATUS_INVALID_PARAMETER;
80 if((pp_new[0] = TALLOC_ZERO_ARRAY(ctx, SEC_ACE, *num )) == 0)
81 return NT_STATUS_NO_MEMORY;
83 for (i = 0; i < *num - 1; i ++)
84 sec_ace_copy(&(*pp_new)[i], &old[i]);
86 (*pp_new)[i].type = 0;
87 (*pp_new)[i].flags = 0;
88 (*pp_new)[i].size = SEC_ACE_HEADER_SIZE + sid_size(sid);
89 (*pp_new)[i].access_mask = mask;
90 sid_copy(&(*pp_new)[i].trustee, sid);
94 /*******************************************************************
95 modify SID's permissions at ACL
96 ********************************************************************/
98 NTSTATUS sec_ace_mod_sid(SEC_ACE *ace, size_t num, DOM_SID *sid, uint32 mask)
102 if (!ace || !sid) return NT_STATUS_INVALID_PARAMETER;
104 for (i = 0; i < num; i ++) {
105 if (sid_compare(&ace[i].trustee, sid) == 0) {
106 ace[i].access_mask = mask;
110 return NT_STATUS_NOT_FOUND;
113 /*******************************************************************
115 ********************************************************************/
117 NTSTATUS sec_ace_del_sid(TALLOC_CTX *ctx, SEC_ACE **pp_new, SEC_ACE *old, uint32 *num, DOM_SID *sid)
120 unsigned int n_del = 0;
122 if (!ctx || !pp_new || !old || !sid || !num) return NT_STATUS_INVALID_PARAMETER;
125 if((pp_new[0] = TALLOC_ZERO_ARRAY(ctx, SEC_ACE, *num )) == 0)
126 return NT_STATUS_NO_MEMORY;
131 for (i = 0; i < *num; i ++) {
132 if (sid_compare(&old[i].trustee, sid) != 0)
133 sec_ace_copy(&(*pp_new)[i], &old[i]);
138 return NT_STATUS_NOT_FOUND;
145 /*******************************************************************
146 Compares two SEC_ACE structures
147 ********************************************************************/
149 bool sec_ace_equal(SEC_ACE *s1, SEC_ACE *s2)
161 /* Check top level stuff */
163 if (s1->type != s2->type || s1->flags != s2->flags ||
164 s1->access_mask != s2->access_mask) {
170 if (!sid_equal(&s1->trustee, &s2->trustee)) {
177 int nt_ace_inherit_comp( SEC_ACE *a1, SEC_ACE *a2)
179 int a1_inh = a1->flags & SEC_ACE_FLAG_INHERITED_ACE;
180 int a2_inh = a2->flags & SEC_ACE_FLAG_INHERITED_ACE;
182 if (a1_inh == a2_inh)
185 if (!a1_inh && a2_inh)
190 /*******************************************************************
191 Comparison function to apply the order explained below in a group.
192 *******************************************************************/
194 int nt_ace_canon_comp( SEC_ACE *a1, SEC_ACE *a2)
196 if ((a1->type == SEC_ACE_TYPE_ACCESS_DENIED) &&
197 (a2->type != SEC_ACE_TYPE_ACCESS_DENIED))
200 if ((a2->type == SEC_ACE_TYPE_ACCESS_DENIED) &&
201 (a1->type != SEC_ACE_TYPE_ACCESS_DENIED))
204 /* Both access denied or access allowed. */
206 /* 1. ACEs that apply to the object itself */
208 if (!(a1->flags & SEC_ACE_FLAG_INHERIT_ONLY) &&
209 (a2->flags & SEC_ACE_FLAG_INHERIT_ONLY))
211 else if (!(a2->flags & SEC_ACE_FLAG_INHERIT_ONLY) &&
212 (a1->flags & SEC_ACE_FLAG_INHERIT_ONLY))
215 /* 2. ACEs that apply to a subobject of the object, such as
216 * a property set or property. */
218 if (a1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT) &&
219 !(a2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT)))
221 else if (a2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT) &&
222 !(a1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT)))
228 /*******************************************************************
229 Functions to convert a SEC_DESC ACE DACL list into canonical order.
232 --- from http://msdn.microsoft.com/library/default.asp?url=/library/en-us/security/security/order_of_aces_in_a_dacl.asp
234 The following describes the preferred order:
236 To ensure that noninherited ACEs have precedence over inherited ACEs,
237 place all noninherited ACEs in a group before any inherited ACEs.
238 This ordering ensures, for example, that a noninherited access-denied ACE
239 is enforced regardless of any inherited ACE that allows access.
241 Within the groups of noninherited ACEs and inherited ACEs, order ACEs according to ACE type, as the following shows:
242 1. Access-denied ACEs that apply to the object itself
243 2. Access-denied ACEs that apply to a subobject of the object, such as a property set or property
244 3. Access-allowed ACEs that apply to the object itself
245 4. Access-allowed ACEs that apply to a subobject of the object"
247 ********************************************************************/
249 void dacl_sort_into_canonical_order(SEC_ACE *srclist, unsigned int num_aces)
253 if (!srclist || num_aces == 0)
256 /* Sort so that non-inherited ACE's come first. */
257 qsort( srclist, num_aces, sizeof(srclist[0]), QSORT_CAST nt_ace_inherit_comp);
259 /* Find the boundary between non-inherited ACEs. */
260 for (i = 0; i < num_aces; i++ ) {
261 SEC_ACE *curr_ace = &srclist[i];
263 if (curr_ace->flags & SEC_ACE_FLAG_INHERITED_ACE)
267 /* i now points at entry number of the first inherited ACE. */
269 /* Sort the non-inherited ACEs. */
271 qsort( srclist, i, sizeof(srclist[0]), QSORT_CAST nt_ace_canon_comp);
273 /* Now sort the inherited ACEs. */
275 qsort( &srclist[i], num_aces - i, sizeof(srclist[0]), QSORT_CAST nt_ace_canon_comp);
278 /*******************************************************************
279 Check if this ACE has a SID in common with the token.
280 ********************************************************************/
282 bool token_sid_in_ace(const NT_USER_TOKEN *token, const SEC_ACE *ace)
286 for (i = 0; i < token->num_sids; i++) {
287 if (sid_equal(&ace->trustee, &token->user_sids[i]))