huwcampbell.com
Reactos
1/*
2 * COPYRIGHT: See COPYRIGHT.TXT
3 * PROJECT: Ext2 File System Driver for WinNT/2K/XP
4 * FILE: access.c
5 * PROGRAMMER: Matt Wu <mattwu@163.com>
6 * HOMEPAGE: http://www.ext2fsd.com
7 * UPDATE HISTORY:
8 */
9
10/* INCLUDES *****************************************************************/
11
12#include "ext2fs.h"
13
14/* GLOBALS ***************************************************************/
15
16extern PEXT2_GLOBAL Ext2Global;
17
18/* DEFINITIONS *************************************************************/
19
20int Ext2CheckInodeAccess(PEXT2_VCB Vcb, struct inode *in, int attempt)
21{
22 int granted = 0;
23
24 uid_t uid = Vcb->uid;
25 gid_t gid = Vcb->gid;
26
27 if (IsFlagOn(Vcb->Flags, VCB_USER_EIDS)) {
28 uid = Vcb->euid;
29 gid = Vcb->egid;
30 }
31
32 if (!uid || uid == in->i_uid) {
33 /* grant all access for inode owner or root */
34 granted = Ext2FileCanRead | Ext2FileCanWrite | Ext2FileCanExecute;
35 } else if (gid == in->i_gid) {
36 if (Ext2IsGroupReadOnly(in->i_mode))
37 granted = Ext2FileCanRead | Ext2FileCanExecute;
38 else if (Ext2IsGroupWritable(in->i_mode))
39 granted = Ext2FileCanRead | Ext2FileCanWrite | Ext2FileCanExecute;
40 } else {
41 if (Ext2IsOtherReadOnly(in->i_mode))
42 granted = Ext2FileCanRead | Ext2FileCanExecute;
43 else if (Ext2IsOtherWritable(in->i_mode))
44 granted = Ext2FileCanRead | Ext2FileCanWrite | Ext2FileCanExecute;
45
46 }
47
48 return IsFlagOn(granted, attempt);
49}
50
51int Ext2CheckFileAccess(PEXT2_VCB Vcb, PEXT2_MCB Mcb, int attempt)
52{
53 return Ext2CheckInodeAccess(Vcb, &Mcb->Inode, attempt);
54}