1124 lines
33 KiB
C
1124 lines
33 KiB
C
/**
|
|
* eCryptfs: Linux filesystem encryption layer
|
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*
|
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* Copyright (C) 1997-2004 Erez Zadok
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* Copyright (C) 2001-2004 Stony Brook University
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* Copyright (C) 2004-2007 International Business Machines Corp.
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* Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
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* Michael C. Thompsion <mcthomps@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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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., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#include <linux/file.h>
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#include <linux/vmalloc.h>
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#include <linux/pagemap.h>
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#include <linux/dcache.h>
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#include <linux/namei.h>
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#include <linux/mount.h>
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#include <linux/crypto.h>
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#include <linux/fs_stack.h>
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#include <asm/unaligned.h>
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#include "ecryptfs_kernel.h"
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|
|
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static struct dentry *lock_parent(struct dentry *dentry)
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|
{
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struct dentry *dir;
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|
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dir = dget_parent(dentry);
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mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT);
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return dir;
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}
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|
|
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static void unlock_dir(struct dentry *dir)
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|
{
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mutex_unlock(&dir->d_inode->i_mutex);
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dput(dir);
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}
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|
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/**
|
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* ecryptfs_create_underlying_file
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* @lower_dir_inode: inode of the parent in the lower fs of the new file
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* @dentry: New file's dentry
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* @mode: The mode of the new file
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* @nd: nameidata of ecryptfs' parent's dentry & vfsmount
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*
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* Creates the file in the lower file system.
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*
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* Returns zero on success; non-zero on error condition
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*/
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static int
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ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
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struct dentry *dentry, int mode,
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struct nameidata *nd)
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{
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struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
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struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
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struct dentry *dentry_save;
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struct vfsmount *vfsmount_save;
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int rc;
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dentry_save = nd->path.dentry;
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vfsmount_save = nd->path.mnt;
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nd->path.dentry = lower_dentry;
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nd->path.mnt = lower_mnt;
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rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
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nd->path.dentry = dentry_save;
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nd->path.mnt = vfsmount_save;
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return rc;
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}
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/**
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* ecryptfs_do_create
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* @directory_inode: inode of the new file's dentry's parent in ecryptfs
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* @ecryptfs_dentry: New file's dentry in ecryptfs
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* @mode: The mode of the new file
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* @nd: nameidata of ecryptfs' parent's dentry & vfsmount
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*
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* Creates the underlying file and the eCryptfs inode which will link to
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* it. It will also update the eCryptfs directory inode to mimic the
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* stat of the lower directory inode.
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*
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* Returns zero on success; non-zero on error condition
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*/
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static int
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ecryptfs_do_create(struct inode *directory_inode,
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struct dentry *ecryptfs_dentry, int mode,
|
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struct nameidata *nd)
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{
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int rc;
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struct dentry *lower_dentry;
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struct dentry *lower_dir_dentry;
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lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
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lower_dir_dentry = lock_parent(lower_dentry);
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if (IS_ERR(lower_dir_dentry)) {
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ecryptfs_printk(KERN_ERR, "Error locking directory of "
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"dentry\n");
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rc = PTR_ERR(lower_dir_dentry);
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goto out;
|
|
}
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rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
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ecryptfs_dentry, mode, nd);
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if (rc) {
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printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
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"rc = [%d]\n", __func__, rc);
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goto out_lock;
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}
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rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
|
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directory_inode->i_sb, 0);
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if (rc) {
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ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
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goto out_lock;
|
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}
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fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
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fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
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out_lock:
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unlock_dir(lower_dir_dentry);
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out:
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return rc;
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}
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/**
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* grow_file
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* @ecryptfs_dentry: the eCryptfs dentry
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*
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* This is the code which will grow the file to its correct size.
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*/
|
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static int grow_file(struct dentry *ecryptfs_dentry)
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|
{
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struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode;
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struct file fake_file;
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struct ecryptfs_file_info tmp_file_info;
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char zero_virt[] = { 0x00 };
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int rc = 0;
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memset(&fake_file, 0, sizeof(fake_file));
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fake_file.f_path.dentry = ecryptfs_dentry;
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memset(&tmp_file_info, 0, sizeof(tmp_file_info));
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ecryptfs_set_file_private(&fake_file, &tmp_file_info);
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ecryptfs_set_file_lower(
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&fake_file,
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ecryptfs_inode_to_private(ecryptfs_inode)->lower_file);
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rc = ecryptfs_write(&fake_file, zero_virt, 0, 1);
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i_size_write(ecryptfs_inode, 0);
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rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode);
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ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |=
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ECRYPTFS_NEW_FILE;
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return rc;
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}
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/**
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* ecryptfs_initialize_file
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*
|
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* Cause the file to be changed from a basic empty file to an ecryptfs
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* file with a header and first data page.
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*
|
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* Returns zero on success
|
|
*/
|
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static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
|
|
{
|
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struct ecryptfs_crypt_stat *crypt_stat =
|
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&ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
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int rc = 0;
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|
|
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if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
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ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
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crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
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goto out;
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}
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crypt_stat->flags |= ECRYPTFS_NEW_FILE;
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ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
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rc = ecryptfs_new_file_context(ecryptfs_dentry);
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if (rc) {
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ecryptfs_printk(KERN_ERR, "Error creating new file "
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"context; rc = [%d]\n", rc);
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goto out;
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}
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if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
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rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
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if (rc) {
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printk(KERN_ERR "%s: Error attempting to initialize "
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"the persistent file for the dentry with name "
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"[%s]; rc = [%d]\n", __func__,
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ecryptfs_dentry->d_name.name, rc);
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goto out;
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}
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}
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rc = ecryptfs_write_metadata(ecryptfs_dentry);
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if (rc) {
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printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
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goto out;
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}
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rc = grow_file(ecryptfs_dentry);
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if (rc)
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printk(KERN_ERR "Error growing file; rc = [%d]\n", rc);
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out:
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return rc;
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}
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/**
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* ecryptfs_create
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* @dir: The inode of the directory in which to create the file.
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* @dentry: The eCryptfs dentry
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* @mode: The mode of the new file.
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* @nd: nameidata
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*
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* Creates a new file.
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*
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* Returns zero on success; non-zero on error condition
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*/
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static int
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ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
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int mode, struct nameidata *nd)
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{
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int rc;
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/* ecryptfs_do_create() calls ecryptfs_interpose() */
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rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd);
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if (unlikely(rc)) {
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ecryptfs_printk(KERN_WARNING, "Failed to create file in"
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"lower filesystem\n");
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goto out;
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}
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/* At this point, a file exists on "disk"; we need to make sure
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* that this on disk file is prepared to be an ecryptfs file */
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rc = ecryptfs_initialize_file(ecryptfs_dentry);
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out:
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return rc;
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}
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/**
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* ecryptfs_lookup_and_interpose_lower - Perform a lookup
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*/
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int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
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struct dentry *lower_dentry,
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struct inode *ecryptfs_dir_inode,
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struct nameidata *ecryptfs_nd)
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{
|
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struct dentry *lower_dir_dentry;
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struct vfsmount *lower_mnt;
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struct inode *lower_inode;
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struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
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struct ecryptfs_crypt_stat *crypt_stat;
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char *page_virt = NULL;
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u64 file_size;
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int rc = 0;
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lower_dir_dentry = lower_dentry->d_parent;
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lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
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ecryptfs_dentry->d_parent));
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lower_inode = lower_dentry->d_inode;
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fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode);
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BUG_ON(!atomic_read(&lower_dentry->d_count));
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ecryptfs_set_dentry_private(ecryptfs_dentry,
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kmem_cache_alloc(ecryptfs_dentry_info_cache,
|
|
GFP_KERNEL));
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if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) {
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rc = -ENOMEM;
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printk(KERN_ERR "%s: Out of memory whilst attempting "
|
|
"to allocate ecryptfs_dentry_info struct\n",
|
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__func__);
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goto out_dput;
|
|
}
|
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ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
|
|
ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
|
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if (!lower_dentry->d_inode) {
|
|
/* We want to add because we couldn't find in lower */
|
|
d_add(ecryptfs_dentry, NULL);
|
|
goto out;
|
|
}
|
|
rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
|
|
ecryptfs_dir_inode->i_sb, 1);
|
|
if (rc) {
|
|
printk(KERN_ERR "%s: Error interposing; rc = [%d]\n",
|
|
__func__, rc);
|
|
goto out;
|
|
}
|
|
if (S_ISDIR(lower_inode->i_mode))
|
|
goto out;
|
|
if (S_ISLNK(lower_inode->i_mode))
|
|
goto out;
|
|
if (special_file(lower_inode->i_mode))
|
|
goto out;
|
|
if (!ecryptfs_nd)
|
|
goto out;
|
|
/* Released in this function */
|
|
page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
|
|
if (!page_virt) {
|
|
printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n",
|
|
__func__);
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
|
|
rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
|
|
if (rc) {
|
|
printk(KERN_ERR "%s: Error attempting to initialize "
|
|
"the persistent file for the dentry with name "
|
|
"[%s]; rc = [%d]\n", __func__,
|
|
ecryptfs_dentry->d_name.name, rc);
|
|
goto out_free_kmem;
|
|
}
|
|
}
|
|
crypt_stat = &ecryptfs_inode_to_private(
|
|
ecryptfs_dentry->d_inode)->crypt_stat;
|
|
/* TODO: lock for crypt_stat comparison */
|
|
if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
|
|
ecryptfs_set_default_sizes(crypt_stat);
|
|
rc = ecryptfs_read_and_validate_header_region(page_virt,
|
|
ecryptfs_dentry->d_inode);
|
|
if (rc) {
|
|
rc = ecryptfs_read_and_validate_xattr_region(page_virt,
|
|
ecryptfs_dentry);
|
|
if (rc) {
|
|
rc = 0;
|
|
goto out_free_kmem;
|
|
}
|
|
crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
|
|
}
|
|
mount_crypt_stat = &ecryptfs_superblock_to_private(
|
|
ecryptfs_dentry->d_sb)->mount_crypt_stat;
|
|
if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) {
|
|
if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
|
|
file_size = (crypt_stat->num_header_bytes_at_front
|
|
+ i_size_read(lower_dentry->d_inode));
|
|
else
|
|
file_size = i_size_read(lower_dentry->d_inode);
|
|
} else {
|
|
file_size = get_unaligned_be64(page_virt);
|
|
}
|
|
i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size);
|
|
out_free_kmem:
|
|
kmem_cache_free(ecryptfs_header_cache_2, page_virt);
|
|
goto out;
|
|
out_dput:
|
|
dput(lower_dentry);
|
|
d_drop(ecryptfs_dentry);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ecryptfs_lookup
|
|
* @ecryptfs_dir_inode: The eCryptfs directory inode
|
|
* @ecryptfs_dentry: The eCryptfs dentry that we are looking up
|
|
* @ecryptfs_nd: nameidata; may be NULL
|
|
*
|
|
* Find a file on disk. If the file does not exist, then we'll add it to the
|
|
* dentry cache and continue on to read it from the disk.
|
|
*/
|
|
static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
|
|
struct dentry *ecryptfs_dentry,
|
|
struct nameidata *ecryptfs_nd)
|
|
{
|
|
char *encrypted_and_encoded_name = NULL;
|
|
size_t encrypted_and_encoded_name_size;
|
|
struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
|
|
struct dentry *lower_dir_dentry, *lower_dentry;
|
|
int rc = 0;
|
|
|
|
ecryptfs_dentry->d_op = &ecryptfs_dops;
|
|
if ((ecryptfs_dentry->d_name.len == 1
|
|
&& !strcmp(ecryptfs_dentry->d_name.name, "."))
|
|
|| (ecryptfs_dentry->d_name.len == 2
|
|
&& !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
|
|
goto out_d_drop;
|
|
}
|
|
lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
|
|
mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
|
|
lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
|
|
lower_dir_dentry,
|
|
ecryptfs_dentry->d_name.len);
|
|
mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
|
|
if (IS_ERR(lower_dentry)) {
|
|
rc = PTR_ERR(lower_dentry);
|
|
printk(KERN_ERR "%s: lookup_one_len() returned [%d] on "
|
|
"lower_dentry = [%s]\n", __func__, rc,
|
|
ecryptfs_dentry->d_name.name);
|
|
goto out_d_drop;
|
|
}
|
|
if (lower_dentry->d_inode)
|
|
goto lookup_and_interpose;
|
|
mount_crypt_stat = &ecryptfs_superblock_to_private(
|
|
ecryptfs_dentry->d_sb)->mount_crypt_stat;
|
|
if (!(mount_crypt_stat
|
|
&& (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
|
|
goto lookup_and_interpose;
|
|
dput(lower_dentry);
|
|
rc = ecryptfs_encrypt_and_encode_filename(
|
|
&encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
|
|
NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
|
|
ecryptfs_dentry->d_name.len);
|
|
if (rc) {
|
|
printk(KERN_ERR "%s: Error attempting to encrypt and encode "
|
|
"filename; rc = [%d]\n", __func__, rc);
|
|
goto out_d_drop;
|
|
}
|
|
mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
|
|
lower_dentry = lookup_one_len(encrypted_and_encoded_name,
|
|
lower_dir_dentry,
|
|
encrypted_and_encoded_name_size - 1);
|
|
mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
|
|
if (IS_ERR(lower_dentry)) {
|
|
rc = PTR_ERR(lower_dentry);
|
|
printk(KERN_ERR "%s: lookup_one_len() returned [%d] on "
|
|
"lower_dentry = [%s]\n", __func__, rc,
|
|
encrypted_and_encoded_name);
|
|
goto out_d_drop;
|
|
}
|
|
lookup_and_interpose:
|
|
rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
|
|
ecryptfs_dir_inode,
|
|
ecryptfs_nd);
|
|
goto out;
|
|
out_d_drop:
|
|
d_drop(ecryptfs_dentry);
|
|
out:
|
|
kfree(encrypted_and_encoded_name);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
|
|
struct dentry *new_dentry)
|
|
{
|
|
struct dentry *lower_old_dentry;
|
|
struct dentry *lower_new_dentry;
|
|
struct dentry *lower_dir_dentry;
|
|
u64 file_size_save;
|
|
int rc;
|
|
|
|
file_size_save = i_size_read(old_dentry->d_inode);
|
|
lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
|
|
lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
|
|
dget(lower_old_dentry);
|
|
dget(lower_new_dentry);
|
|
lower_dir_dentry = lock_parent(lower_new_dentry);
|
|
rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
|
|
lower_new_dentry);
|
|
if (rc || !lower_new_dentry->d_inode)
|
|
goto out_lock;
|
|
rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0);
|
|
if (rc)
|
|
goto out_lock;
|
|
fsstack_copy_attr_times(dir, lower_new_dentry->d_inode);
|
|
fsstack_copy_inode_size(dir, lower_new_dentry->d_inode);
|
|
old_dentry->d_inode->i_nlink =
|
|
ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
|
|
i_size_write(new_dentry->d_inode, file_size_save);
|
|
out_lock:
|
|
unlock_dir(lower_dir_dentry);
|
|
dput(lower_new_dentry);
|
|
dput(lower_old_dentry);
|
|
d_drop(lower_old_dentry);
|
|
d_drop(new_dentry);
|
|
d_drop(old_dentry);
|
|
return rc;
|
|
}
|
|
|
|
static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
int rc = 0;
|
|
struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
|
|
struct dentry *lower_dir_dentry;
|
|
|
|
dget(lower_dentry);
|
|
lower_dir_dentry = lock_parent(lower_dentry);
|
|
rc = vfs_unlink(lower_dir_inode, lower_dentry);
|
|
if (rc) {
|
|
printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
|
|
goto out_unlock;
|
|
}
|
|
fsstack_copy_attr_times(dir, lower_dir_inode);
|
|
dentry->d_inode->i_nlink =
|
|
ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
|
|
dentry->d_inode->i_ctime = dir->i_ctime;
|
|
d_drop(dentry);
|
|
out_unlock:
|
|
unlock_dir(lower_dir_dentry);
|
|
dput(lower_dentry);
|
|
return rc;
|
|
}
|
|
|
|
static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
|
|
const char *symname)
|
|
{
|
|
int rc;
|
|
struct dentry *lower_dentry;
|
|
struct dentry *lower_dir_dentry;
|
|
char *encoded_symname;
|
|
size_t encoded_symlen;
|
|
struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
dget(lower_dentry);
|
|
lower_dir_dentry = lock_parent(lower_dentry);
|
|
mount_crypt_stat = &ecryptfs_superblock_to_private(
|
|
dir->i_sb)->mount_crypt_stat;
|
|
rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
|
|
&encoded_symlen,
|
|
NULL,
|
|
mount_crypt_stat, symname,
|
|
strlen(symname));
|
|
if (rc)
|
|
goto out_lock;
|
|
rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
|
|
encoded_symname);
|
|
kfree(encoded_symname);
|
|
if (rc || !lower_dentry->d_inode)
|
|
goto out_lock;
|
|
rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
|
|
if (rc)
|
|
goto out_lock;
|
|
fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
|
|
fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
|
|
out_lock:
|
|
unlock_dir(lower_dir_dentry);
|
|
dput(lower_dentry);
|
|
if (!dentry->d_inode)
|
|
d_drop(dentry);
|
|
return rc;
|
|
}
|
|
|
|
static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
|
|
{
|
|
int rc;
|
|
struct dentry *lower_dentry;
|
|
struct dentry *lower_dir_dentry;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
lower_dir_dentry = lock_parent(lower_dentry);
|
|
rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
|
|
if (rc || !lower_dentry->d_inode)
|
|
goto out;
|
|
rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
|
|
if (rc)
|
|
goto out;
|
|
fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
|
|
fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
|
|
dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
|
|
out:
|
|
unlock_dir(lower_dir_dentry);
|
|
if (!dentry->d_inode)
|
|
d_drop(dentry);
|
|
return rc;
|
|
}
|
|
|
|
static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct dentry *lower_dentry;
|
|
struct dentry *lower_dir_dentry;
|
|
int rc;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
dget(dentry);
|
|
lower_dir_dentry = lock_parent(lower_dentry);
|
|
dget(lower_dentry);
|
|
rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
|
|
dput(lower_dentry);
|
|
if (!rc)
|
|
d_delete(lower_dentry);
|
|
fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
|
|
dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
|
|
unlock_dir(lower_dir_dentry);
|
|
if (!rc)
|
|
d_drop(dentry);
|
|
dput(dentry);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
|
|
{
|
|
int rc;
|
|
struct dentry *lower_dentry;
|
|
struct dentry *lower_dir_dentry;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
lower_dir_dentry = lock_parent(lower_dentry);
|
|
rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
|
|
if (rc || !lower_dentry->d_inode)
|
|
goto out;
|
|
rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
|
|
if (rc)
|
|
goto out;
|
|
fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
|
|
fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
|
|
out:
|
|
unlock_dir(lower_dir_dentry);
|
|
if (!dentry->d_inode)
|
|
d_drop(dentry);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry)
|
|
{
|
|
int rc;
|
|
struct dentry *lower_old_dentry;
|
|
struct dentry *lower_new_dentry;
|
|
struct dentry *lower_old_dir_dentry;
|
|
struct dentry *lower_new_dir_dentry;
|
|
|
|
lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
|
|
lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
|
|
dget(lower_old_dentry);
|
|
dget(lower_new_dentry);
|
|
lower_old_dir_dentry = dget_parent(lower_old_dentry);
|
|
lower_new_dir_dentry = dget_parent(lower_new_dentry);
|
|
lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
|
|
rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
|
|
lower_new_dir_dentry->d_inode, lower_new_dentry);
|
|
if (rc)
|
|
goto out_lock;
|
|
fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode, NULL);
|
|
if (new_dir != old_dir)
|
|
fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode, NULL);
|
|
out_lock:
|
|
unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
|
|
dput(lower_new_dentry->d_parent);
|
|
dput(lower_old_dentry->d_parent);
|
|
dput(lower_new_dentry);
|
|
dput(lower_old_dentry);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
|
|
{
|
|
char *lower_buf;
|
|
size_t lower_bufsiz;
|
|
struct dentry *lower_dentry;
|
|
struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
|
|
char *plaintext_name;
|
|
size_t plaintext_name_size;
|
|
mm_segment_t old_fs;
|
|
int rc;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
if (!lower_dentry->d_inode->i_op->readlink) {
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
mount_crypt_stat = &ecryptfs_superblock_to_private(
|
|
dentry->d_sb)->mount_crypt_stat;
|
|
/*
|
|
* If the lower filename is encrypted, it will result in a significantly
|
|
* longer name. If needed, truncate the name after decode and decrypt.
|
|
*/
|
|
if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
|
|
lower_bufsiz = PATH_MAX;
|
|
else
|
|
lower_bufsiz = bufsiz;
|
|
/* Released in this function */
|
|
lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
|
|
if (lower_buf == NULL) {
|
|
printk(KERN_ERR "%s: Out of memory whilst attempting to "
|
|
"kmalloc [%zd] bytes\n", __func__, lower_bufsiz);
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
old_fs = get_fs();
|
|
set_fs(get_ds());
|
|
rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
|
|
(char __user *)lower_buf,
|
|
lower_bufsiz);
|
|
set_fs(old_fs);
|
|
if (rc >= 0) {
|
|
rc = ecryptfs_decode_and_decrypt_filename(&plaintext_name,
|
|
&plaintext_name_size,
|
|
dentry, lower_buf,
|
|
rc);
|
|
if (rc) {
|
|
printk(KERN_ERR "%s: Error attempting to decode and "
|
|
"decrypt filename; rc = [%d]\n", __func__,
|
|
rc);
|
|
goto out_free_lower_buf;
|
|
}
|
|
/* Check for bufsiz <= 0 done in sys_readlinkat() */
|
|
rc = copy_to_user(buf, plaintext_name,
|
|
min((size_t) bufsiz, plaintext_name_size));
|
|
if (rc)
|
|
rc = -EFAULT;
|
|
else
|
|
rc = plaintext_name_size;
|
|
kfree(plaintext_name);
|
|
fsstack_copy_attr_atime(dentry->d_inode, lower_dentry->d_inode);
|
|
}
|
|
out_free_lower_buf:
|
|
kfree(lower_buf);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
char *buf;
|
|
int len = PAGE_SIZE, rc;
|
|
mm_segment_t old_fs;
|
|
|
|
/* Released in ecryptfs_put_link(); only release here on error */
|
|
buf = kmalloc(len, GFP_KERNEL);
|
|
if (!buf) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
old_fs = get_fs();
|
|
set_fs(get_ds());
|
|
rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
|
|
set_fs(old_fs);
|
|
if (rc < 0)
|
|
goto out_free;
|
|
else
|
|
buf[rc] = '\0';
|
|
rc = 0;
|
|
nd_set_link(nd, buf);
|
|
goto out;
|
|
out_free:
|
|
kfree(buf);
|
|
out:
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
static void
|
|
ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
|
|
{
|
|
/* Free the char* */
|
|
kfree(nd_get_link(nd));
|
|
}
|
|
|
|
/**
|
|
* upper_size_to_lower_size
|
|
* @crypt_stat: Crypt_stat associated with file
|
|
* @upper_size: Size of the upper file
|
|
*
|
|
* Calculate the required size of the lower file based on the
|
|
* specified size of the upper file. This calculation is based on the
|
|
* number of headers in the underlying file and the extent size.
|
|
*
|
|
* Returns Calculated size of the lower file.
|
|
*/
|
|
static loff_t
|
|
upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
|
|
loff_t upper_size)
|
|
{
|
|
loff_t lower_size;
|
|
|
|
lower_size = crypt_stat->num_header_bytes_at_front;
|
|
if (upper_size != 0) {
|
|
loff_t num_extents;
|
|
|
|
num_extents = upper_size >> crypt_stat->extent_shift;
|
|
if (upper_size & ~crypt_stat->extent_mask)
|
|
num_extents++;
|
|
lower_size += (num_extents * crypt_stat->extent_size);
|
|
}
|
|
return lower_size;
|
|
}
|
|
|
|
/**
|
|
* ecryptfs_truncate
|
|
* @dentry: The ecryptfs layer dentry
|
|
* @new_length: The length to expand the file to
|
|
*
|
|
* Function to handle truncations modifying the size of the file. Note
|
|
* that the file sizes are interpolated. When expanding, we are simply
|
|
* writing strings of 0's out. When truncating, we need to modify the
|
|
* underlying file size according to the page index interpolations.
|
|
*
|
|
* Returns zero on success; non-zero otherwise
|
|
*/
|
|
int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
|
|
{
|
|
int rc = 0;
|
|
struct inode *inode = dentry->d_inode;
|
|
struct dentry *lower_dentry;
|
|
struct file fake_ecryptfs_file;
|
|
struct ecryptfs_crypt_stat *crypt_stat;
|
|
loff_t i_size = i_size_read(inode);
|
|
loff_t lower_size_before_truncate;
|
|
loff_t lower_size_after_truncate;
|
|
|
|
if (unlikely((new_length == i_size)))
|
|
goto out;
|
|
crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
|
|
/* Set up a fake ecryptfs file, this is used to interface with
|
|
* the file in the underlying filesystem so that the
|
|
* truncation has an effect there as well. */
|
|
memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file));
|
|
fake_ecryptfs_file.f_path.dentry = dentry;
|
|
/* Released at out_free: label */
|
|
ecryptfs_set_file_private(&fake_ecryptfs_file,
|
|
kmem_cache_alloc(ecryptfs_file_info_cache,
|
|
GFP_KERNEL));
|
|
if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
ecryptfs_set_file_lower(
|
|
&fake_ecryptfs_file,
|
|
ecryptfs_inode_to_private(dentry->d_inode)->lower_file);
|
|
/* Switch on growing or shrinking file */
|
|
if (new_length > i_size) {
|
|
char zero[] = { 0x00 };
|
|
|
|
/* Write a single 0 at the last position of the file;
|
|
* this triggers code that will fill in 0's throughout
|
|
* the intermediate portion of the previous end of the
|
|
* file and the new and of the file */
|
|
rc = ecryptfs_write(&fake_ecryptfs_file, zero,
|
|
(new_length - 1), 1);
|
|
} else { /* new_length < i_size_read(inode) */
|
|
/* We're chopping off all the pages down do the page
|
|
* in which new_length is located. Fill in the end of
|
|
* that page from (new_length & ~PAGE_CACHE_MASK) to
|
|
* PAGE_CACHE_SIZE with zeros. */
|
|
size_t num_zeros = (PAGE_CACHE_SIZE
|
|
- (new_length & ~PAGE_CACHE_MASK));
|
|
|
|
if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
|
|
rc = vmtruncate(inode, new_length);
|
|
if (rc)
|
|
goto out_free;
|
|
rc = vmtruncate(lower_dentry->d_inode, new_length);
|
|
goto out_free;
|
|
}
|
|
if (num_zeros) {
|
|
char *zeros_virt;
|
|
|
|
zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
|
|
if (!zeros_virt) {
|
|
rc = -ENOMEM;
|
|
goto out_free;
|
|
}
|
|
rc = ecryptfs_write(&fake_ecryptfs_file, zeros_virt,
|
|
new_length, num_zeros);
|
|
kfree(zeros_virt);
|
|
if (rc) {
|
|
printk(KERN_ERR "Error attempting to zero out "
|
|
"the remainder of the end page on "
|
|
"reducing truncate; rc = [%d]\n", rc);
|
|
goto out_free;
|
|
}
|
|
}
|
|
vmtruncate(inode, new_length);
|
|
rc = ecryptfs_write_inode_size_to_metadata(inode);
|
|
if (rc) {
|
|
printk(KERN_ERR "Problem with "
|
|
"ecryptfs_write_inode_size_to_metadata; "
|
|
"rc = [%d]\n", rc);
|
|
goto out_free;
|
|
}
|
|
/* We are reducing the size of the ecryptfs file, and need to
|
|
* know if we need to reduce the size of the lower file. */
|
|
lower_size_before_truncate =
|
|
upper_size_to_lower_size(crypt_stat, i_size);
|
|
lower_size_after_truncate =
|
|
upper_size_to_lower_size(crypt_stat, new_length);
|
|
if (lower_size_after_truncate < lower_size_before_truncate)
|
|
vmtruncate(lower_dentry->d_inode,
|
|
lower_size_after_truncate);
|
|
}
|
|
out_free:
|
|
if (ecryptfs_file_to_private(&fake_ecryptfs_file))
|
|
kmem_cache_free(ecryptfs_file_info_cache,
|
|
ecryptfs_file_to_private(&fake_ecryptfs_file));
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
ecryptfs_permission(struct inode *inode, int mask)
|
|
{
|
|
return inode_permission(ecryptfs_inode_to_lower(inode), mask);
|
|
}
|
|
|
|
/**
|
|
* ecryptfs_setattr
|
|
* @dentry: dentry handle to the inode to modify
|
|
* @ia: Structure with flags of what to change and values
|
|
*
|
|
* Updates the metadata of an inode. If the update is to the size
|
|
* i.e. truncation, then ecryptfs_truncate will handle the size modification
|
|
* of both the ecryptfs inode and the lower inode.
|
|
*
|
|
* All other metadata changes will be passed right to the lower filesystem,
|
|
* and we will just update our inode to look like the lower.
|
|
*/
|
|
static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
|
|
{
|
|
int rc = 0;
|
|
struct dentry *lower_dentry;
|
|
struct inode *inode;
|
|
struct inode *lower_inode;
|
|
struct ecryptfs_crypt_stat *crypt_stat;
|
|
|
|
crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
|
|
if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
|
|
ecryptfs_init_crypt_stat(crypt_stat);
|
|
inode = dentry->d_inode;
|
|
lower_inode = ecryptfs_inode_to_lower(inode);
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
mutex_lock(&crypt_stat->cs_mutex);
|
|
if (S_ISDIR(dentry->d_inode->i_mode))
|
|
crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
|
|
else if (S_ISREG(dentry->d_inode->i_mode)
|
|
&& (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
|
|
|| !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
|
|
struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
|
|
|
|
mount_crypt_stat = &ecryptfs_superblock_to_private(
|
|
dentry->d_sb)->mount_crypt_stat;
|
|
rc = ecryptfs_read_metadata(dentry);
|
|
if (rc) {
|
|
if (!(mount_crypt_stat->flags
|
|
& ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
|
|
rc = -EIO;
|
|
printk(KERN_WARNING "Either the lower file "
|
|
"is not in a valid eCryptfs format, "
|
|
"or the key could not be retrieved. "
|
|
"Plaintext passthrough mode is not "
|
|
"enabled; returning -EIO\n");
|
|
mutex_unlock(&crypt_stat->cs_mutex);
|
|
goto out;
|
|
}
|
|
rc = 0;
|
|
crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
|
|
}
|
|
}
|
|
mutex_unlock(&crypt_stat->cs_mutex);
|
|
if (ia->ia_valid & ATTR_SIZE) {
|
|
ecryptfs_printk(KERN_DEBUG,
|
|
"ia->ia_valid = [0x%x] ATTR_SIZE" " = [0x%x]\n",
|
|
ia->ia_valid, ATTR_SIZE);
|
|
rc = ecryptfs_truncate(dentry, ia->ia_size);
|
|
/* ecryptfs_truncate handles resizing of the lower file */
|
|
ia->ia_valid &= ~ATTR_SIZE;
|
|
ecryptfs_printk(KERN_DEBUG, "ia->ia_valid = [%x]\n",
|
|
ia->ia_valid);
|
|
if (rc < 0)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* mode change is for clearing setuid/setgid bits. Allow lower fs
|
|
* to interpret this in its own way.
|
|
*/
|
|
if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
|
|
ia->ia_valid &= ~ATTR_MODE;
|
|
|
|
mutex_lock(&lower_dentry->d_inode->i_mutex);
|
|
rc = notify_change(lower_dentry, ia);
|
|
mutex_unlock(&lower_dentry->d_inode->i_mutex);
|
|
out:
|
|
fsstack_copy_attr_all(inode, lower_inode, NULL);
|
|
return rc;
|
|
}
|
|
|
|
int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
|
|
struct kstat *stat)
|
|
{
|
|
struct kstat lower_stat;
|
|
int rc;
|
|
|
|
rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
|
|
ecryptfs_dentry_to_lower(dentry), &lower_stat);
|
|
if (!rc) {
|
|
generic_fillattr(dentry->d_inode, stat);
|
|
stat->blocks = lower_stat.blocks;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
|
|
size_t size, int flags)
|
|
{
|
|
int rc = 0;
|
|
struct dentry *lower_dentry;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
if (!lower_dentry->d_inode->i_op->setxattr) {
|
|
rc = -ENOSYS;
|
|
goto out;
|
|
}
|
|
mutex_lock(&lower_dentry->d_inode->i_mutex);
|
|
rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value,
|
|
size, flags);
|
|
mutex_unlock(&lower_dentry->d_inode->i_mutex);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
ssize_t
|
|
ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
|
|
void *value, size_t size)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (!lower_dentry->d_inode->i_op->getxattr) {
|
|
rc = -ENOSYS;
|
|
goto out;
|
|
}
|
|
mutex_lock(&lower_dentry->d_inode->i_mutex);
|
|
rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
|
|
size);
|
|
mutex_unlock(&lower_dentry->d_inode->i_mutex);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static ssize_t
|
|
ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
|
|
size_t size)
|
|
{
|
|
return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
|
|
value, size);
|
|
}
|
|
|
|
static ssize_t
|
|
ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
|
|
{
|
|
int rc = 0;
|
|
struct dentry *lower_dentry;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
if (!lower_dentry->d_inode->i_op->listxattr) {
|
|
rc = -ENOSYS;
|
|
goto out;
|
|
}
|
|
mutex_lock(&lower_dentry->d_inode->i_mutex);
|
|
rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
|
|
mutex_unlock(&lower_dentry->d_inode->i_mutex);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
|
|
{
|
|
int rc = 0;
|
|
struct dentry *lower_dentry;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
if (!lower_dentry->d_inode->i_op->removexattr) {
|
|
rc = -ENOSYS;
|
|
goto out;
|
|
}
|
|
mutex_lock(&lower_dentry->d_inode->i_mutex);
|
|
rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
|
|
mutex_unlock(&lower_dentry->d_inode->i_mutex);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode)
|
|
{
|
|
if ((ecryptfs_inode_to_lower(inode)
|
|
== (struct inode *)candidate_lower_inode))
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
int ecryptfs_inode_set(struct inode *inode, void *lower_inode)
|
|
{
|
|
ecryptfs_init_inode(inode, (struct inode *)lower_inode);
|
|
return 0;
|
|
}
|
|
|
|
const struct inode_operations ecryptfs_symlink_iops = {
|
|
.readlink = ecryptfs_readlink,
|
|
.follow_link = ecryptfs_follow_link,
|
|
.put_link = ecryptfs_put_link,
|
|
.permission = ecryptfs_permission,
|
|
.setattr = ecryptfs_setattr,
|
|
.setxattr = ecryptfs_setxattr,
|
|
.getxattr = ecryptfs_getxattr,
|
|
.listxattr = ecryptfs_listxattr,
|
|
.removexattr = ecryptfs_removexattr
|
|
};
|
|
|
|
const struct inode_operations ecryptfs_dir_iops = {
|
|
.create = ecryptfs_create,
|
|
.lookup = ecryptfs_lookup,
|
|
.link = ecryptfs_link,
|
|
.unlink = ecryptfs_unlink,
|
|
.symlink = ecryptfs_symlink,
|
|
.mkdir = ecryptfs_mkdir,
|
|
.rmdir = ecryptfs_rmdir,
|
|
.mknod = ecryptfs_mknod,
|
|
.rename = ecryptfs_rename,
|
|
.permission = ecryptfs_permission,
|
|
.setattr = ecryptfs_setattr,
|
|
.setxattr = ecryptfs_setxattr,
|
|
.getxattr = ecryptfs_getxattr,
|
|
.listxattr = ecryptfs_listxattr,
|
|
.removexattr = ecryptfs_removexattr
|
|
};
|
|
|
|
const struct inode_operations ecryptfs_main_iops = {
|
|
.permission = ecryptfs_permission,
|
|
.setattr = ecryptfs_setattr,
|
|
.getattr = ecryptfs_getattr,
|
|
.setxattr = ecryptfs_setxattr,
|
|
.getxattr = ecryptfs_getxattr,
|
|
.listxattr = ecryptfs_listxattr,
|
|
.removexattr = ecryptfs_removexattr
|
|
};
|