1 files changed, 285 insertions, 0 deletions
diff --git a/source3/lib/secace.c b/source3/lib/secace.c
new file mode 100644
index 0000000000..6769f1288a
--- /dev/null
+++ b/source3/lib/secace.c
@@ -0,0 +1,285 @@
+/* 
+ *  Unix SMB/Netbios implementation.
+ *  SEC_ACE handling functions
+ *  Copyright (C) Andrew Tridgell              1992-1998,
+ *  Copyright (C) Jeremy R. Allison            1995-2003.
+ *  Copyright (C) Luke Kenneth Casson Leighton 1996-1998,
+ *  Copyright (C) Paul Ashton                  1997-1998.
+ *  
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *  
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *  
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "includes.h"
+
+/*******************************************************************
+ Check if ACE has OBJECT type.
+********************************************************************/
+
+BOOL sec_ace_object(uint8 type)
+{
+	if (type == SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT ||
+            type == SEC_ACE_TYPE_ACCESS_DENIED_OBJECT ||
+            type == SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT ||
+            type == SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT) {
+		return True;
+	}
+	return False;
+}
+
+/*******************************************************************
+ copy a SEC_ACE structure.
+********************************************************************/
+void sec_ace_copy(SEC_ACE *ace_dest, SEC_ACE *ace_src)
+{
+	ace_dest->type  = ace_src->type;
+	ace_dest->flags = ace_src->flags;
+	ace_dest->size  = ace_src->size;
+	ace_dest->info.mask = ace_src->info.mask;
+	ace_dest->obj_flags = ace_src->obj_flags;
+	memcpy(&ace_dest->obj_guid, &ace_src->obj_guid, GUID_SIZE);
+	memcpy(&ace_dest->inh_guid, &ace_src->inh_guid, GUID_SIZE);	
+	sid_copy(&ace_dest->trustee, &ace_src->trustee);
+}
+
+/*******************************************************************
+ Sets up a SEC_ACE structure.
+********************************************************************/
+
+void init_sec_ace(SEC_ACE *t, DOM_SID *sid, uint8 type, SEC_ACCESS mask, uint8 flag)
+{
+	t->type = type;
+	t->flags = flag;
+	t->size = sid_size(sid) + 8;
+	t->info = mask;
+
+	ZERO_STRUCTP(&t->trustee);
+	sid_copy(&t->trustee, sid);
+}
+
+/*******************************************************************
+ adds new SID with its permissions to ACE list
+********************************************************************/
+
+NTSTATUS sec_ace_add_sid(TALLOC_CTX *ctx, SEC_ACE **new, SEC_ACE *old, unsigned *num, DOM_SID *sid, uint32 mask)
+{
+	unsigned int i = 0;
+	
+	if (!ctx || !new || !old || !sid || !num)  return NT_STATUS_INVALID_PARAMETER;
+
+	*num += 1;
+	
+	if((new[0] = (SEC_ACE *) talloc_zero(ctx, (*num) * sizeof(SEC_ACE))) == 0)
+		return NT_STATUS_NO_MEMORY;
+
+	for (i = 0; i < *num - 1; i ++)
+		sec_ace_copy(&(*new)[i], &old[i]);
+
+	(*new)[i].type  = 0;
+	(*new)[i].flags = 0;
+	(*new)[i].size  = SEC_ACE_HEADER_SIZE + sid_size(sid);
+	(*new)[i].info.mask = mask;
+	sid_copy(&(*new)[i].trustee, sid);
+	return NT_STATUS_OK;
+}
+
+/*******************************************************************
+  modify SID's permissions at ACL 
+********************************************************************/
+
+NTSTATUS sec_ace_mod_sid(SEC_ACE *ace, size_t num, DOM_SID *sid, uint32 mask)
+{
+	unsigned int i = 0;
+
+	if (!ace || !sid)  return NT_STATUS_INVALID_PARAMETER;
+
+	for (i = 0; i < num; i ++) {
+		if (sid_compare(&ace[i].trustee, sid) == 0) {
+			ace[i].info.mask = mask;
+			return NT_STATUS_OK;
+		}
+	}
+	return NT_STATUS_NOT_FOUND;
+}
+
+/*******************************************************************
+ delete SID from ACL
+********************************************************************/
+
+NTSTATUS sec_ace_del_sid(TALLOC_CTX *ctx, SEC_ACE **new, SEC_ACE *old, uint32 *num, DOM_SID *sid)
+{
+	unsigned int i     = 0;
+	unsigned int n_del = 0;
+
+	if (!ctx || !new || !old || !sid || !num)  return NT_STATUS_INVALID_PARAMETER;
+
+	if((new[0] = (SEC_ACE *) talloc_zero(ctx, (*num) * sizeof(SEC_ACE))) == 0)
+		return NT_STATUS_NO_MEMORY;
+
+	for (i = 0; i < *num; i ++) {
+		if (sid_compare(&old[i].trustee, sid) != 0)
+			sec_ace_copy(&(*new)[i], &old[i]);
+		else
+			n_del ++;
+	}
+	if (n_del == 0)
+		return NT_STATUS_NOT_FOUND;
+	else {
+		*num -= n_del;
+		return NT_STATUS_OK;
+	}
+}
+
+/*******************************************************************
+ Compares two SEC_ACE structures
+********************************************************************/
+
+BOOL sec_ace_equal(SEC_ACE *s1, SEC_ACE *s2)
+{
+	/* Trivial case */
+
+	if (!s1 && !s2) return True;
+
+	/* Check top level stuff */
+
+	if (s1->type != s2->type || s1->flags != s2->flags ||
+	    s1->info.mask != s2->info.mask) {
+		return False;
+	}
+
+	/* Check SID */
+
+	if (!sid_equal(&s1->trustee, &s2->trustee)) {
+		return False;
+	}
+
+	return True;
+}
+
+int nt_ace_inherit_comp( SEC_ACE *a1, SEC_ACE *a2)
+{
+	int a1_inh = a1->flags & SEC_ACE_FLAG_INHERITED_ACE;
+	int a2_inh = a2->flags & SEC_ACE_FLAG_INHERITED_ACE;
+
+	if (a1_inh == a2_inh)
+		return 0;
+
+	if (!a1_inh && a2_inh)
+		return -1;
+	return 1;
+}
+
+/*******************************************************************
+  Comparison function to apply the order explained below in a group.
+*******************************************************************/
+
+int nt_ace_canon_comp( SEC_ACE *a1, SEC_ACE *a2)
+{
+	if ((a1->type == SEC_ACE_TYPE_ACCESS_DENIED) &&
+				(a2->type != SEC_ACE_TYPE_ACCESS_DENIED))
+		return -1;
+
+	if ((a2->type == SEC_ACE_TYPE_ACCESS_DENIED) &&
+				(a1->type != SEC_ACE_TYPE_ACCESS_DENIED))
+		return 1;
+
+	/* Both access denied or access allowed. */
+
+	/* 1. ACEs that apply to the object itself */
+
+	if (!(a1->flags & SEC_ACE_FLAG_INHERIT_ONLY) &&
+			(a2->flags & SEC_ACE_FLAG_INHERIT_ONLY))
+		return -1;
+	else if (!(a2->flags & SEC_ACE_FLAG_INHERIT_ONLY) &&
+			(a1->flags & SEC_ACE_FLAG_INHERIT_ONLY))
+		return 1;
+
+	/* 2. ACEs that apply to a subobject of the object, such as
+	 * a property set or property. */
+
+	if (a1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT) &&
+			!(a2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT)))
+		return -1;
+	else if (a2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT) &&
+			!(a1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT)))
+		return 1;
+
+	return 0;
+}
+
+/*******************************************************************
+ Functions to convert a SEC_DESC ACE DACL list into canonical order.
+ JRA.
+
+--- from http://msdn.microsoft.com/library/default.asp?url=/library/en-us/security/security/order_of_aces_in_a_dacl.asp
+
+The following describes the preferred order:
+
+ To ensure that noninherited ACEs have precedence over inherited ACEs,
+ place all noninherited ACEs in a group before any inherited ACEs.
+ This ordering ensures, for example, that a noninherited access-denied ACE
+ is enforced regardless of any inherited ACE that allows access.
+
+ Within the groups of noninherited ACEs and inherited ACEs, order ACEs according to ACE type, as the following shows:
+	1. Access-denied ACEs that apply to the object itself
+	2. Access-denied ACEs that apply to a subobject of the object, such as a property set or property
+	3. Access-allowed ACEs that apply to the object itself
+	4. Access-allowed ACEs that apply to a subobject of the object"
+
+********************************************************************/
+
+void dacl_sort_into_canonical_order(SEC_ACE *srclist, unsigned int num_aces)
+{
+	unsigned int i;
+
+	if (!srclist || num_aces == 0)
+		return;
+
+	/* Sort so that non-inherited ACE's come first. */
+	qsort( srclist, num_aces, sizeof(srclist[0]), QSORT_CAST nt_ace_inherit_comp);
+
+	/* Find the boundary between non-inherited ACEs. */
+	for (i = 0; i < num_aces; i++ ) {
+		SEC_ACE *curr_ace = &srclist[i];
+
+		if (curr_ace->flags & SEC_ACE_FLAG_INHERITED_ACE)
+			break;
+	}
+
+	/* i now points at entry number of the first inherited ACE. */
+
+	/* Sort the non-inherited ACEs. */
+	if (i)
+		qsort( srclist, i, sizeof(srclist[0]), QSORT_CAST nt_ace_canon_comp);
+
+	/* Now sort the inherited ACEs. */
+	if (num_aces - i)
+		qsort( &srclist[i], num_aces - i, sizeof(srclist[0]), QSORT_CAST nt_ace_canon_comp);
+}
+
+/*******************************************************************
+ Check if this ACE has a SID in common with the token.
+********************************************************************/
+
+BOOL token_sid_in_ace(const NT_USER_TOKEN *token, const SEC_ACE *ace)
+{
+	size_t i;
+
+	for (i = 0; i < token->num_sids; i++) {
+		if (sid_equal(&ace->trustee, &token->user_sids[i]))
+			return True;
+	}
+
+	return False;
+}