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* Unix SMB/Netbios implementation.
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* SEC_ACE handling functions
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* Copyright (C) Andrew Tridgell 1992-1998,
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* Copyright (C) Jeremy R. Allison 1995-2003.
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* Copyright (C) Luke Kenneth Casson Leighton 1996-1998,
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* Copyright (C) Paul Ashton 1997-1998.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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/*******************************************************************
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Check if ACE has OBJECT type.
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********************************************************************/
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BOOL sec_ace_object(uint8 type)
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if (type == SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT ||
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type == SEC_ACE_TYPE_ACCESS_DENIED_OBJECT ||
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type == SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT ||
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type == SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT) {
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/*******************************************************************
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copy a SEC_ACE structure.
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********************************************************************/
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void sec_ace_copy(SEC_ACE *ace_dest, SEC_ACE *ace_src)
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ace_dest->type = ace_src->type;
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ace_dest->flags = ace_src->flags;
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ace_dest->size = ace_src->size;
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ace_dest->info.mask = ace_src->info.mask;
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ace_dest->obj_flags = ace_src->obj_flags;
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memcpy(&ace_dest->obj_guid, &ace_src->obj_guid, sizeof(struct uuid));
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memcpy(&ace_dest->inh_guid, &ace_src->inh_guid, sizeof(struct uuid));
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sid_copy(&ace_dest->trustee, &ace_src->trustee);
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/*******************************************************************
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Sets up a SEC_ACE structure.
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********************************************************************/
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void init_sec_ace(SEC_ACE *t, const DOM_SID *sid, uint8 type, SEC_ACCESS mask, uint8 flag)
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t->size = sid_size(sid) + 8;
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ZERO_STRUCTP(&t->trustee);
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sid_copy(&t->trustee, sid);
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/*******************************************************************
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adds new SID with its permissions to ACE list
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********************************************************************/
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NTSTATUS sec_ace_add_sid(TALLOC_CTX *ctx, SEC_ACE **pp_new, SEC_ACE *old, unsigned *num, DOM_SID *sid, uint32 mask)
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if (!ctx || !pp_new || !old || !sid || !num) return NT_STATUS_INVALID_PARAMETER;
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if((pp_new[0] = TALLOC_ZERO_ARRAY(ctx, SEC_ACE, *num )) == 0)
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return NT_STATUS_NO_MEMORY;
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for (i = 0; i < *num - 1; i ++)
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sec_ace_copy(&(*pp_new)[i], &old[i]);
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(*pp_new)[i].type = 0;
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(*pp_new)[i].flags = 0;
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(*pp_new)[i].size = SEC_ACE_HEADER_SIZE + sid_size(sid);
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(*pp_new)[i].info.mask = mask;
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sid_copy(&(*pp_new)[i].trustee, sid);
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/*******************************************************************
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modify SID's permissions at ACL
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********************************************************************/
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NTSTATUS sec_ace_mod_sid(SEC_ACE *ace, size_t num, DOM_SID *sid, uint32 mask)
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if (!ace || !sid) return NT_STATUS_INVALID_PARAMETER;
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for (i = 0; i < num; i ++) {
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if (sid_compare(&ace[i].trustee, sid) == 0) {
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ace[i].info.mask = mask;
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return NT_STATUS_NOT_FOUND;
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/*******************************************************************
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********************************************************************/
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NTSTATUS sec_ace_del_sid(TALLOC_CTX *ctx, SEC_ACE **pp_new, SEC_ACE *old, uint32 *num, DOM_SID *sid)
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unsigned int n_del = 0;
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if (!ctx || !pp_new || !old || !sid || !num) return NT_STATUS_INVALID_PARAMETER;
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if((pp_new[0] = TALLOC_ZERO_ARRAY(ctx, SEC_ACE, *num )) == 0)
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return NT_STATUS_NO_MEMORY;
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for (i = 0; i < *num; i ++) {
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if (sid_compare(&old[i].trustee, sid) != 0)
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sec_ace_copy(&(*pp_new)[i], &old[i]);
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return NT_STATUS_NOT_FOUND;
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/*******************************************************************
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Compares two SEC_ACE structures
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********************************************************************/
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BOOL sec_ace_equal(SEC_ACE *s1, SEC_ACE *s2)
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/* Check top level stuff */
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if (s1->type != s2->type || s1->flags != s2->flags ||
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s1->info.mask != s2->info.mask) {
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if (!sid_equal(&s1->trustee, &s2->trustee)) {
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int nt_ace_inherit_comp( SEC_ACE *a1, SEC_ACE *a2)
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int a1_inh = a1->flags & SEC_ACE_FLAG_INHERITED_ACE;
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int a2_inh = a2->flags & SEC_ACE_FLAG_INHERITED_ACE;
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if (a1_inh == a2_inh)
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if (!a1_inh && a2_inh)
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/*******************************************************************
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Comparison function to apply the order explained below in a group.
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*******************************************************************/
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int nt_ace_canon_comp( SEC_ACE *a1, SEC_ACE *a2)
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if ((a1->type == SEC_ACE_TYPE_ACCESS_DENIED) &&
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(a2->type != SEC_ACE_TYPE_ACCESS_DENIED))
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if ((a2->type == SEC_ACE_TYPE_ACCESS_DENIED) &&
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(a1->type != SEC_ACE_TYPE_ACCESS_DENIED))
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/* Both access denied or access allowed. */
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/* 1. ACEs that apply to the object itself */
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if (!(a1->flags & SEC_ACE_FLAG_INHERIT_ONLY) &&
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(a2->flags & SEC_ACE_FLAG_INHERIT_ONLY))
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else if (!(a2->flags & SEC_ACE_FLAG_INHERIT_ONLY) &&
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(a1->flags & SEC_ACE_FLAG_INHERIT_ONLY))
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/* 2. ACEs that apply to a subobject of the object, such as
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* a property set or property. */
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if (a1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT) &&
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!(a2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT)))
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else if (a2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT) &&
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!(a1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT)))
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/*******************************************************************
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Functions to convert a SEC_DESC ACE DACL list into canonical order.
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--- from http://msdn.microsoft.com/library/default.asp?url=/library/en-us/security/security/order_of_aces_in_a_dacl.asp
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The following describes the preferred order:
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To ensure that noninherited ACEs have precedence over inherited ACEs,
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place all noninherited ACEs in a group before any inherited ACEs.
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This ordering ensures, for example, that a noninherited access-denied ACE
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is enforced regardless of any inherited ACE that allows access.
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Within the groups of noninherited ACEs and inherited ACEs, order ACEs according to ACE type, as the following shows:
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1. Access-denied ACEs that apply to the object itself
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2. Access-denied ACEs that apply to a subobject of the object, such as a property set or property
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3. Access-allowed ACEs that apply to the object itself
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4. Access-allowed ACEs that apply to a subobject of the object"
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********************************************************************/
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void dacl_sort_into_canonical_order(SEC_ACE *srclist, unsigned int num_aces)
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if (!srclist || num_aces == 0)
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/* Sort so that non-inherited ACE's come first. */
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qsort( srclist, num_aces, sizeof(srclist[0]), QSORT_CAST nt_ace_inherit_comp);
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/* Find the boundary between non-inherited ACEs. */
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for (i = 0; i < num_aces; i++ ) {
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SEC_ACE *curr_ace = &srclist[i];
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if (curr_ace->flags & SEC_ACE_FLAG_INHERITED_ACE)
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/* i now points at entry number of the first inherited ACE. */
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/* Sort the non-inherited ACEs. */
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qsort( srclist, i, sizeof(srclist[0]), QSORT_CAST nt_ace_canon_comp);
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/* Now sort the inherited ACEs. */
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qsort( &srclist[i], num_aces - i, sizeof(srclist[0]), QSORT_CAST nt_ace_canon_comp);
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/*******************************************************************
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Check if this ACE has a SID in common with the token.
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********************************************************************/
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BOOL token_sid_in_ace(const NT_USER_TOKEN *token, const SEC_ACE *ace)
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for (i = 0; i < token->num_sids; i++) {
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if (sid_equal(&ace->trustee, &token->user_sids[i]))