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/*
* Unix SMB/CIFS implementation.
* Group Policy Object Support
* Copyright (C) Guenther Deschner 2007
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
/****************************************************************
****************************************************************/
static bool gpo_sd_check_agp_object_guid(const struct security_ace_object *object)
{
struct GUID ext_right_apg_guid;
NTSTATUS status;
if (!object) {
return False;
}
status = GUID_from_string(ADS_EXTENDED_RIGHT_APPLY_GROUP_POLICY,
&ext_right_apg_guid);
if (!NT_STATUS_IS_OK(status)) {
return False;
}
switch (object->flags) {
case SEC_ACE_OBJECT_PRESENT:
if (GUID_equal(&object->type.type,
&ext_right_apg_guid)) {
return True;
}
case SEC_ACE_OBJECT_INHERITED_PRESENT:
if (GUID_equal(&object->inherited_type.inherited_type,
&ext_right_apg_guid)) {
return True;
}
default:
break;
}
return False;
}
/****************************************************************
****************************************************************/
static bool gpo_sd_check_agp_object(const SEC_ACE *ace)
{
if (!sec_ace_object(ace->type)) {
return False;
}
return gpo_sd_check_agp_object_guid(&ace->object.object);
}
/****************************************************************
****************************************************************/
static bool gpo_sd_check_agp_access_bits(uint32_t access_mask)
{
return (access_mask & SEC_RIGHTS_EXTENDED);
}
#if 0
/****************************************************************
****************************************************************/
static bool gpo_sd_check_read_access_bits(uint32_t access_mask)
{
uint32_t read_bits = SEC_RIGHTS_LIST_CONTENTS |
SEC_RIGHTS_READ_ALL_PROP |
SEC_RIGHTS_READ_PERMS;
return (read_bits == (access_mask & read_bits));
}
#endif
/****************************************************************
****************************************************************/
static NTSTATUS gpo_sd_check_ace_denied_object(const SEC_ACE *ace,
const struct nt_user_token *token)
{
if (gpo_sd_check_agp_object(ace) &&
gpo_sd_check_agp_access_bits(ace->access_mask) &&
nt_token_check_sid(&ace->trustee, token)) {
DEBUG(10,("gpo_sd_check_ace_denied_object: "
"Access denied as of ace for %s\n",
sid_string_static(&ace->trustee)));
return NT_STATUS_ACCESS_DENIED;
}
return STATUS_MORE_ENTRIES;
}
/****************************************************************
****************************************************************/
static NTSTATUS gpo_sd_check_ace_allowed_object(const SEC_ACE *ace,
const struct nt_user_token *token)
{
if (gpo_sd_check_agp_object(ace) &&
gpo_sd_check_agp_access_bits(ace->access_mask) &&
nt_token_check_sid(&ace->trustee, token)) {
DEBUG(10,("gpo_sd_check_ace_allowed_object: "
"Access granted as of ace for %s\n",
sid_string_static(&ace->trustee)));
return NT_STATUS_OK;
}
return STATUS_MORE_ENTRIES;
}
/****************************************************************
****************************************************************/
static NTSTATUS gpo_sd_check_ace(const SEC_ACE *ace,
const struct nt_user_token *token)
{
switch (ace->type) {
case SEC_ACE_TYPE_ACCESS_DENIED_OBJECT:
return gpo_sd_check_ace_denied_object(ace, token);
case SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT:
return gpo_sd_check_ace_allowed_object(ace, token);
default:
return STATUS_MORE_ENTRIES;
}
}
/****************************************************************
****************************************************************/
NTSTATUS gpo_apply_security_filtering(const struct GROUP_POLICY_OBJECT *gpo,
const struct nt_user_token *token)
{
SEC_DESC *sd = gpo->security_descriptor;
SEC_ACL *dacl = NULL;
NTSTATUS status = NT_STATUS_ACCESS_DENIED;
int i;
if (!token) {
return NT_STATUS_INVALID_USER_BUFFER;
}
if (!sd) {
return NT_STATUS_INVALID_SECURITY_DESCR;
}
dacl = sd->dacl;
if (!dacl) {
return NT_STATUS_INVALID_SECURITY_DESCR;
}
/* check all aces and only return NT_STATUS_OK (== Access granted) or
* NT_STATUS_ACCESS_DENIED ( == Access denied) - the default is to
* deny access */
for (i = 0; i < dacl->num_aces; i ++) {
status = gpo_sd_check_ace(&dacl->aces[i], token);
if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
return status;
} else if (NT_STATUS_IS_OK(status)) {
return status;
}
continue;
}
return NT_STATUS_ACCESS_DENIED;
}
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