895 lines
25 KiB
C
895 lines
25 KiB
C
/**
|
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* 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 <mhalcrow@us.ibm.com>
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* Michael C. Thompson <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/poll.h>
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#include <linux/slab.h>
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#include <linux/mount.h>
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#include <linux/pagemap.h>
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#include <linux/security.h>
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#include <linux/compat.h>
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#include <linux/fs_stack.h>
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#include "ecryptfs_kernel.h"
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#ifdef CONFIG_WTL_ENCRYPTION_FILTER
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#include <linux/ctype.h>
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#define ECRYPTFS_IOCTL_GET_ATTRIBUTES _IOR('l', 0x10, __u32)
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#define ECRYPTFS_WAS_ENCRYPTED 0x0080
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#define ECRYPTFS_WAS_ENCRYPTED_OTHER_DEVICE 0x0100
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#endif
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#ifdef CONFIG_SDP
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#if 0
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#include <linux/fs.h>
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#include <linux/syscalls.h>
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#include <linux/atomic.h>
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#endif
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#include "ecryptfs_dek.h"
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#include "mm.h"
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#endif
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#ifdef CONFIG_DLP
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#include "ecryptfs_dlp.h"
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#include <sdp/sdp_dlp.h>
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#include <sdp/fs_request.h>
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#endif
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/**
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* ecryptfs_read_update_atime
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*
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* generic_file_read updates the atime of upper layer inode. But, it
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* doesn't give us a chance to update the atime of the lower layer
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* inode. This function is a wrapper to generic_file_read. It
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* updates the atime of the lower level inode if generic_file_read
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* returns without any errors. This is to be used only for file reads.
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* The function to be used for directory reads is ecryptfs_read.
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*/
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static ssize_t ecryptfs_read_update_atime(struct kiocb *iocb,
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struct iov_iter *to)
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{
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ssize_t rc;
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struct path *path;
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struct file *file = iocb->ki_filp;
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rc = generic_file_read_iter(iocb, to);
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if (rc >= 0) {
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path = ecryptfs_dentry_to_lower_path(file->f_path.dentry);
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touch_atime(path);
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}
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return rc;
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}
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struct ecryptfs_getdents_callback {
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struct dir_context ctx;
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struct dir_context *caller;
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struct super_block *sb;
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int filldir_called;
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int entries_written;
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};
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/* Inspired by generic filldir in fs/readdir.c */
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static int
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ecryptfs_filldir(struct dir_context *ctx, const char *lower_name,
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int lower_namelen, loff_t offset, u64 ino, unsigned int d_type)
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{
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struct ecryptfs_getdents_callback *buf =
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container_of(ctx, struct ecryptfs_getdents_callback, ctx);
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size_t name_size;
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char *name;
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int rc;
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buf->filldir_called++;
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rc = ecryptfs_decode_and_decrypt_filename(&name, &name_size,
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buf->sb, lower_name,
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lower_namelen);
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if (rc) {
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printk(KERN_ERR "%s: Error attempting to decode and decrypt "
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"filename [%s]; rc = [%d]\n", __func__, lower_name,
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rc);
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goto out;
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}
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buf->caller->pos = buf->ctx.pos;
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rc = !dir_emit(buf->caller, name, name_size, ino, d_type);
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kfree(name);
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if (!rc)
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buf->entries_written++;
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out:
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return rc;
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}
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/**
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* ecryptfs_readdir
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* @file: The eCryptfs directory file
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* @ctx: The actor to feed the entries to
|
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*/
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static int ecryptfs_readdir(struct file *file, struct dir_context *ctx)
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{
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int rc;
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struct file *lower_file;
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struct inode *inode = file_inode(file);
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struct ecryptfs_getdents_callback buf = {
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.ctx.actor = ecryptfs_filldir,
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.caller = ctx,
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.sb = inode->i_sb,
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};
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lower_file = ecryptfs_file_to_lower(file);
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rc = iterate_dir(lower_file, &buf.ctx);
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ctx->pos = buf.ctx.pos;
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if (rc < 0)
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goto out;
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if (buf.filldir_called && !buf.entries_written)
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goto out;
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if (rc >= 0)
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fsstack_copy_attr_atime(inode,
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file_inode(lower_file));
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out:
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return rc;
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}
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struct kmem_cache *ecryptfs_file_info_cache;
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static int read_or_initialize_metadata(struct dentry *dentry)
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{
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struct inode *inode = d_inode(dentry);
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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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int rc;
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crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
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mount_crypt_stat = &ecryptfs_superblock_to_private(
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inode->i_sb)->mount_crypt_stat;
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#ifdef CONFIG_WTL_ENCRYPTION_FILTER
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if (crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED
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&& crypt_stat->flags & ECRYPTFS_POLICY_APPLIED
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&& crypt_stat->flags & ECRYPTFS_ENCRYPTED
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&& !(crypt_stat->flags & ECRYPTFS_KEY_VALID)
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&& !(crypt_stat->flags & ECRYPTFS_KEY_SET)
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&& crypt_stat->flags & ECRYPTFS_I_SIZE_INITIALIZED) {
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crypt_stat->flags |= ECRYPTFS_ENCRYPTED_OTHER_DEVICE;
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}
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mutex_lock(&crypt_stat->cs_mutex);
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if ((mount_crypt_stat->flags & ECRYPTFS_ENABLE_NEW_PASSTHROUGH)
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&& (crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
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if (ecryptfs_read_metadata(dentry)) {
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crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
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| ECRYPTFS_ENCRYPTED);
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rc = 0;
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goto out;
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}
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} else if ((mount_crypt_stat->flags & ECRYPTFS_ENABLE_FILTERING)
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&& (crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
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struct dentry *fp_dentry =
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ecryptfs_inode_to_private(inode)->lower_file->f_path.dentry;
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char filename[NAME_MAX+1] = {0};
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if (fp_dentry->d_name.len <= NAME_MAX)
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memcpy(filename, fp_dentry->d_name.name,
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fp_dentry->d_name.len + 1);
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if (is_file_name_match(mount_crypt_stat, fp_dentry)
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|| is_file_ext_match(mount_crypt_stat, filename)) {
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if (ecryptfs_read_metadata(dentry))
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crypt_stat->flags &=
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~(ECRYPTFS_I_SIZE_INITIALIZED
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| ECRYPTFS_ENCRYPTED);
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rc = 0;
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goto out;
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}
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}
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mutex_unlock(&crypt_stat->cs_mutex);
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#endif
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mutex_lock(&crypt_stat->cs_mutex);
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if (crypt_stat->flags & ECRYPTFS_POLICY_APPLIED &&
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crypt_stat->flags & ECRYPTFS_KEY_VALID) {
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rc = 0;
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goto out;
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}
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rc = ecryptfs_read_metadata(dentry);
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if (!rc)
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goto out;
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#ifdef CONFIG_SDP
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/*
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* no passthrough/xattr for sensitive files
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*/
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if ((rc) && crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE)
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goto out;
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#endif
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if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED) {
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crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
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| ECRYPTFS_ENCRYPTED);
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rc = 0;
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goto out;
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}
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if (!(mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED) &&
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!i_size_read(ecryptfs_inode_to_lower(inode))) {
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rc = ecryptfs_initialize_file(dentry, inode);
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if (!rc)
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goto out;
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}
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rc = -EIO;
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out:
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mutex_unlock(&crypt_stat->cs_mutex);
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#ifdef CONFIG_SDP
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if(!rc)
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{
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/*
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* SDP v2.0 : sensitive directory (SDP vault)
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* Files under sensitive directory automatically becomes sensitive
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*/
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struct dentry *p = dentry->d_parent;
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struct inode *parent_inode = p->d_inode;
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struct ecryptfs_crypt_stat *parent_crypt_stat =
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&ecryptfs_inode_to_private(parent_inode)->crypt_stat;
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if (!(crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE) &&
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((S_ISDIR(parent_inode->i_mode)) &&
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(parent_crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE))) {
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rc = ecryptfs_sdp_set_sensitive(parent_crypt_stat->engine_id, dentry);
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}
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}
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#endif
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return rc;
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}
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static int ecryptfs_mmap(struct file *file, struct vm_area_struct *vma)
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{
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struct dentry *dentry = ecryptfs_dentry_to_lower(file->f_path.dentry);
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/*
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* Don't allow mmap on top of file systems that don't support it
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* natively. If FILESYSTEM_MAX_STACK_DEPTH > 2 or ecryptfs
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* allows recursive mounting, this will need to be extended.
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*/
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if (!dentry->d_inode->i_fop->mmap)
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return -ENODEV;
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return generic_file_mmap(file, vma);
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}
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/**
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* ecryptfs_open
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* @inode: inode speciying file to open
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* @file: Structure to return filled in
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*
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* Opens the file specified by inode.
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*
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* Returns zero on success; non-zero otherwise
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*/
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static int ecryptfs_open(struct inode *inode, struct file *file)
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{
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int rc = 0;
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struct ecryptfs_crypt_stat *crypt_stat = NULL;
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struct dentry *ecryptfs_dentry = file->f_path.dentry;
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|
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#if defined(CONFIG_SDP) || defined(CONFIG_FMP_ECRYPT_FS)
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struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
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#endif
|
|
|
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/* Private value of ecryptfs_dentry allocated in
|
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* ecryptfs_lookup() */
|
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struct ecryptfs_file_info *file_info;
|
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#ifdef CONFIG_DLP
|
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sdp_fs_command_t *cmd = NULL;
|
|
|
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ssize_t dlp_len = 0;
|
|
struct knox_dlp_data dlp_data;
|
|
struct timespec ts;
|
|
#endif
|
|
#if defined(CONFIG_SDP)
|
|
mount_crypt_stat = &ecryptfs_superblock_to_private(
|
|
inode->i_sb)->mount_crypt_stat;
|
|
#endif
|
|
/* Released in ecryptfs_release or end of function if failure */
|
|
file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
|
|
ecryptfs_set_file_private(file, file_info);
|
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if (!file_info) {
|
|
ecryptfs_printk(KERN_ERR,
|
|
"Error attempting to allocate memory\n");
|
|
rc = -ENOMEM;
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|
goto out;
|
|
}
|
|
crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
|
|
mutex_lock(&crypt_stat->cs_mutex);
|
|
if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
|
|
ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
|
|
/* Policy code enabled in future release */
|
|
crypt_stat->flags |= (ECRYPTFS_POLICY_APPLIED
|
|
| ECRYPTFS_ENCRYPTED);
|
|
}
|
|
mutex_unlock(&crypt_stat->cs_mutex);
|
|
rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
|
|
if (rc) {
|
|
printk(KERN_ERR "%s: Error attempting to initialize "
|
|
"the lower file for the dentry with name "
|
|
"[%pd]; rc = [%d]\n", __func__,
|
|
ecryptfs_dentry, rc);
|
|
goto out_free;
|
|
}
|
|
if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE)
|
|
== O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) {
|
|
rc = -EPERM;
|
|
printk(KERN_WARNING "%s: Lower file is RO; eCryptfs "
|
|
"file must hence be opened RO\n", __func__);
|
|
goto out_put;
|
|
}
|
|
ecryptfs_set_file_lower(
|
|
file, ecryptfs_inode_to_private(inode)->lower_file);
|
|
rc = read_or_initialize_metadata(ecryptfs_dentry);
|
|
#ifdef CONFIG_SDP
|
|
if (rc) {
|
|
if(file->f_flags & O_SDP){
|
|
printk("Failed to initialize metadata, "
|
|
"but let it continue cause current call is from SDP API\n");
|
|
mutex_lock(&crypt_stat->cs_mutex);
|
|
crypt_stat->flags &= ~(ECRYPTFS_KEY_VALID);
|
|
mutex_unlock(&crypt_stat->cs_mutex);
|
|
rc = 0;
|
|
/*
|
|
* Letting this continue doesn't mean to allow read/writing. It will anyway fail later.
|
|
*
|
|
* 1. In this stage, ecryptfs_stat won't have key/iv and encryption ctx.
|
|
* 2. ECRYPTFS_KEY_VALID bit is off, next attempt will try reading metadata again.
|
|
* 3. Skip DEK conversion. it cannot be done anyway.
|
|
*/
|
|
goto out;
|
|
}
|
|
goto out_put;
|
|
}
|
|
#else
|
|
if (rc)
|
|
goto out_put;
|
|
#endif
|
|
|
|
#ifdef CONFIG_SDP
|
|
if (crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE) {
|
|
#ifdef CONFIG_SDP_KEY_DUMP
|
|
if (S_ISREG(ecryptfs_dentry->d_inode->i_mode)) {
|
|
if(get_sdp_sysfs_key_dump()) {
|
|
printk("FEK[%s] : ", ecryptfs_dentry->d_name.name);
|
|
key_dump(crypt_stat->key, 32);
|
|
}
|
|
}
|
|
#endif
|
|
/*
|
|
* Need to update sensitive mapping on file open
|
|
*/
|
|
if (S_ISREG(ecryptfs_dentry->d_inode->i_mode)) {
|
|
ecryptfs_set_mapping_sensitive(inode, mount_crypt_stat->userid, TO_SENSITIVE);
|
|
}
|
|
|
|
if (ecryptfs_is_sdp_locked(crypt_stat->engine_id)) {
|
|
ecryptfs_printk(KERN_INFO, "ecryptfs_open: persona is locked, rc=%d\n", rc);
|
|
} else {
|
|
int dek_type = crypt_stat->sdp_dek.type;
|
|
|
|
ecryptfs_printk(KERN_INFO, "ecryptfs_open: persona is unlocked, rc=%d\n", rc);
|
|
if(dek_type != DEK_TYPE_AES_ENC) {
|
|
ecryptfs_printk(KERN_DEBUG, "converting dek...\n");
|
|
rc = ecryptfs_sdp_convert_dek(ecryptfs_dentry);
|
|
ecryptfs_printk(KERN_DEBUG, "conversion ready, rc=%d\n", rc);
|
|
rc = 0; // TODO: Do we need to return error if conversion fails?
|
|
}
|
|
}
|
|
}
|
|
#if ECRYPTFS_DEK_DEBUG
|
|
else {
|
|
ecryptfs_printk(KERN_INFO, "ecryptfs_open: dek_file_type is protected\n");
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef CONFIG_DLP
|
|
if(crypt_stat->flags & ECRYPTFS_DLP_ENABLED) {
|
|
#if DLP_DEBUG
|
|
printk("DLP %s: try to open %s [%lu] with crypt_stat->flags %d\n",
|
|
__func__, ecryptfs_dentry->d_name.name, inode->i_ino, crypt_stat->flags);
|
|
#endif
|
|
|
|
dlp_len = ecryptfs_dentry->d_inode->i_op->getxattr(
|
|
ecryptfs_dentry,
|
|
KNOX_DLP_XATTR_NAME,
|
|
&dlp_data, sizeof(dlp_data));
|
|
|
|
if(dlp_data.expiry_time.tv_sec <= 0){
|
|
#if DLP_DEBUG
|
|
printk("[LOG] %s: DLP flag is set but it is not DLP file -> media created file but not DLP [%s]\n",
|
|
__func__, ecryptfs_dentry->d_name.name);
|
|
#endif
|
|
goto dlp_out;
|
|
}
|
|
|
|
if (dlp_is_locked(mount_crypt_stat->userid)) {
|
|
printk("%s: DLP locked\n", __func__);
|
|
rc = -EPERM;
|
|
goto out_put;
|
|
}
|
|
|
|
if(in_egroup_p(AID_KNOX_DLP) || in_egroup_p(AID_KNOX_DLP_RESTRICTED) || in_egroup_p(AID_KNOX_DLP_MEDIA)) {
|
|
if (dlp_len == sizeof(dlp_data)) {
|
|
getnstimeofday(&ts);
|
|
#if DLP_DEBUG
|
|
printk("DLP %s: current time [%ld/%ld] %s\n",
|
|
__func__, (long)ts.tv_sec, (long)dlp_data.expiry_time.tv_sec, ecryptfs_dentry->d_name.name);
|
|
#endif
|
|
if ((ts.tv_sec > dlp_data.expiry_time.tv_sec) &&
|
|
dlp_isInterestedFile(mount_crypt_stat->userid, ecryptfs_dentry->d_name.name)==0) {
|
|
|
|
if(in_egroup_p(AID_KNOX_DLP_MEDIA)) { //ignore media notifications
|
|
/* Command to delete expired file */
|
|
cmd = sdp_fs_command_alloc(FSOP_DLP_FILE_REMOVE_MEDIA,
|
|
current->tgid, mount_crypt_stat->userid, mount_crypt_stat->partition_id,
|
|
inode->i_ino, GFP_KERNEL);
|
|
} else {
|
|
/* Command to delete expired file */
|
|
cmd = sdp_fs_command_alloc(FSOP_DLP_FILE_REMOVE,
|
|
current->tgid, mount_crypt_stat->userid, mount_crypt_stat->partition_id,
|
|
inode->i_ino, GFP_KERNEL);
|
|
}
|
|
rc = -ENOENT;
|
|
goto out_put;
|
|
}
|
|
} else if (dlp_len == -ENODATA) {
|
|
/* DLP flag is set, but no DLP data. Let it continue, xattr will be set later */
|
|
printk("DLP %s: normal file [%s]\n",
|
|
__func__, ecryptfs_dentry->d_name.name);
|
|
} else {
|
|
printk("DLP %s: Error, len [%ld], [%s]\n",
|
|
__func__, (long)dlp_len, ecryptfs_dentry->d_name.name);
|
|
rc = -EFAULT;
|
|
goto out_put;
|
|
}
|
|
|
|
#if DLP_DEBUG
|
|
printk("DLP %s: DLP file [%s] opened with tgid %d, %d\n" ,
|
|
__func__, ecryptfs_dentry->d_name.name, current->tgid, in_egroup_p(AID_KNOX_DLP_RESTRICTED));
|
|
#endif
|
|
if(in_egroup_p(AID_KNOX_DLP_RESTRICTED)) {
|
|
cmd = sdp_fs_command_alloc(FSOP_DLP_FILE_OPENED,
|
|
current->tgid, mount_crypt_stat->userid, mount_crypt_stat->partition_id,
|
|
inode->i_ino, GFP_KERNEL);
|
|
} else if(in_egroup_p(AID_KNOX_DLP)) {
|
|
cmd = sdp_fs_command_alloc(FSOP_DLP_FILE_OPENED_CREATOR,
|
|
current->tgid, mount_crypt_stat->userid, mount_crypt_stat->partition_id,
|
|
inode->i_ino, GFP_KERNEL);
|
|
} else {
|
|
printk("DLP %s: DLP open file file from Media process ignoring sending event\n", __func__);
|
|
}
|
|
} else {
|
|
printk("DLP %s: not DLP app [%s]\n", __func__, current->comm);
|
|
printk("DLP %s: DLP open file failed\n", __func__);
|
|
cmd = sdp_fs_command_alloc(FSOP_DLP_FILE_ACCESS_DENIED,
|
|
current->tgid, mount_crypt_stat->userid, mount_crypt_stat->partition_id,
|
|
inode->i_ino, GFP_KERNEL);
|
|
|
|
rc = -EPERM;
|
|
goto out_put;
|
|
}
|
|
}
|
|
|
|
dlp_out:
|
|
#endif
|
|
ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
|
|
"[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
|
|
(unsigned long long)i_size_read(inode));
|
|
goto out;
|
|
out_put:
|
|
ecryptfs_put_lower_file(inode);
|
|
out_free:
|
|
kmem_cache_free(ecryptfs_file_info_cache,
|
|
ecryptfs_file_to_private(file));
|
|
out:
|
|
#ifdef CONFIG_DLP
|
|
if(cmd) {
|
|
sdp_fs_request(cmd, NULL);
|
|
sdp_fs_command_free(cmd);
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_SDP
|
|
if (rc && (rc != -ENOENT)) {
|
|
cmd = sdp_fs_command_alloc(FSOP_AUDIT_FAIL_ACCESS,
|
|
current->tgid, mount_crypt_stat->userid, mount_crypt_stat->partition_id,
|
|
inode->i_ino, GFP_KERNEL);
|
|
if(cmd) {
|
|
sdp_fs_request(cmd, NULL);
|
|
sdp_fs_command_free(cmd);
|
|
}
|
|
}
|
|
#endif
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ecryptfs_dir_open
|
|
* @inode: inode speciying file to open
|
|
* @file: Structure to return filled in
|
|
*
|
|
* Opens the file specified by inode.
|
|
*
|
|
* Returns zero on success; non-zero otherwise
|
|
*/
|
|
static int ecryptfs_dir_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct dentry *ecryptfs_dentry = file->f_path.dentry;
|
|
/* Private value of ecryptfs_dentry allocated in
|
|
* ecryptfs_lookup() */
|
|
struct ecryptfs_file_info *file_info;
|
|
struct file *lower_file;
|
|
#if defined(CONFIG_SDP)
|
|
struct ecryptfs_crypt_stat *crypt_stat = NULL;
|
|
struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
|
|
#endif
|
|
/* Released in ecryptfs_release or end of function if failure */
|
|
file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
|
|
ecryptfs_set_file_private(file, file_info);
|
|
if (unlikely(!file_info)) {
|
|
ecryptfs_printk(KERN_ERR,
|
|
"Error attempting to allocate memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
lower_file = dentry_open(ecryptfs_dentry_to_lower_path(ecryptfs_dentry),
|
|
file->f_flags, current_cred());
|
|
if (IS_ERR(lower_file)) {
|
|
printk(KERN_ERR "%s: Error attempting to initialize "
|
|
"the lower file for the dentry with name "
|
|
"[%pd]; rc = [%ld]\n", __func__,
|
|
ecryptfs_dentry, PTR_ERR(lower_file));
|
|
kmem_cache_free(ecryptfs_file_info_cache, file_info);
|
|
return PTR_ERR(lower_file);
|
|
}
|
|
ecryptfs_set_file_lower(file, lower_file);
|
|
#ifdef CONFIG_SDP
|
|
mount_crypt_stat = &ecryptfs_superblock_to_private(inode->i_sb)->mount_crypt_stat;
|
|
crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
|
|
/*
|
|
* it's possible to have a sensitive directory. (vault)
|
|
*/
|
|
if (mount_crypt_stat->flags & ECRYPTFS_MOUNT_SDP_ENABLED)
|
|
crypt_stat->flags |= ECRYPTFS_DEK_SDP_ENABLED;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int ecryptfs_flush(struct file *file, fl_owner_t td)
|
|
{
|
|
struct file *lower_file = ecryptfs_file_to_lower(file);
|
|
|
|
if (lower_file->f_op->flush) {
|
|
filemap_write_and_wait(file->f_mapping);
|
|
return lower_file->f_op->flush(lower_file, td);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ecryptfs_release(struct inode *inode, struct file *file)
|
|
{
|
|
#ifdef CONFIG_SDP
|
|
struct ecryptfs_crypt_stat *crypt_stat;
|
|
crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
|
|
|
|
mutex_lock(&crypt_stat->cs_mutex);
|
|
#endif
|
|
ecryptfs_put_lower_file(inode);
|
|
#ifdef CONFIG_SDP
|
|
mutex_unlock(&crypt_stat->cs_mutex);
|
|
#endif
|
|
kmem_cache_free(ecryptfs_file_info_cache,
|
|
ecryptfs_file_to_private(file));
|
|
return 0;
|
|
}
|
|
|
|
static int ecryptfs_dir_release(struct inode *inode, struct file *file)
|
|
{
|
|
fput(ecryptfs_file_to_lower(file));
|
|
kmem_cache_free(ecryptfs_file_info_cache,
|
|
ecryptfs_file_to_private(file));
|
|
return 0;
|
|
}
|
|
|
|
static loff_t ecryptfs_dir_llseek(struct file *file, loff_t offset, int whence)
|
|
{
|
|
return vfs_llseek(ecryptfs_file_to_lower(file), offset, whence);
|
|
}
|
|
|
|
static int
|
|
ecryptfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
|
|
{
|
|
int rc;
|
|
|
|
rc = filemap_write_and_wait(file->f_mapping);
|
|
if (rc)
|
|
return rc;
|
|
|
|
return vfs_fsync(ecryptfs_file_to_lower(file), datasync);
|
|
}
|
|
|
|
static int ecryptfs_fasync(int fd, struct file *file, int flag)
|
|
{
|
|
int rc = 0;
|
|
struct file *lower_file = NULL;
|
|
|
|
lower_file = ecryptfs_file_to_lower(file);
|
|
if (lower_file->f_op->fasync)
|
|
rc = lower_file->f_op->fasync(fd, lower_file, flag);
|
|
return rc;
|
|
}
|
|
|
|
static long
|
|
ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct file *lower_file = ecryptfs_file_to_lower(file);
|
|
long rc = -ENOTTY;
|
|
long sdp_rc = -ENOTTY;
|
|
|
|
#ifdef CONFIG_WTL_ENCRYPTION_FILTER
|
|
if (cmd == ECRYPTFS_IOCTL_GET_ATTRIBUTES) {
|
|
u32 __user *user_attr = (u32 __user *)arg;
|
|
u32 attr = 0;
|
|
char filename[NAME_MAX+1] = {0};
|
|
struct dentry *ecryptfs_dentry = file->f_path.dentry;
|
|
struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
|
|
&ecryptfs_superblock_to_private(ecryptfs_dentry->d_sb)
|
|
->mount_crypt_stat;
|
|
|
|
struct inode *inode = ecryptfs_dentry->d_inode;
|
|
struct ecryptfs_crypt_stat *crypt_stat =
|
|
&ecryptfs_inode_to_private(inode)->crypt_stat;
|
|
struct dentry *fp_dentry =
|
|
ecryptfs_inode_to_private(inode)->lower_file->f_path.dentry;
|
|
if (fp_dentry->d_name.len <= NAME_MAX)
|
|
memcpy(filename, fp_dentry->d_name.name,
|
|
fp_dentry->d_name.len + 1);
|
|
|
|
mutex_lock(&crypt_stat->cs_mutex);
|
|
if ((crypt_stat->flags & ECRYPTFS_ENCRYPTED
|
|
|| crypt_stat->flags & ECRYPTFS_ENCRYPTED_OTHER_DEVICE)
|
|
|| ((mount_crypt_stat->flags
|
|
& ECRYPTFS_ENABLE_FILTERING)
|
|
&& (is_file_name_match
|
|
(mount_crypt_stat, fp_dentry)
|
|
|| is_file_ext_match
|
|
(mount_crypt_stat, filename)))) {
|
|
if (crypt_stat->flags & ECRYPTFS_KEY_VALID)
|
|
attr = ECRYPTFS_WAS_ENCRYPTED;
|
|
else
|
|
attr = ECRYPTFS_WAS_ENCRYPTED_OTHER_DEVICE;
|
|
}
|
|
mutex_unlock(&crypt_stat->cs_mutex);
|
|
put_user(attr, user_attr);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SDP
|
|
sdp_rc = ecryptfs_do_sdp_ioctl(file, cmd, arg);
|
|
if (sdp_rc != -EOPNOTSUPP)
|
|
return sdp_rc;
|
|
#else
|
|
printk("%s CONFIG_SDP not enabled \n", __func__);
|
|
#endif
|
|
if (!lower_file->f_op->unlocked_ioctl)
|
|
return rc;
|
|
|
|
switch (cmd) {
|
|
case FITRIM:
|
|
case FS_IOC_GETFLAGS:
|
|
case FS_IOC_SETFLAGS:
|
|
case FS_IOC_GETVERSION:
|
|
case FS_IOC_SETVERSION:
|
|
rc = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg);
|
|
fsstack_copy_attr_all(file_inode(file), file_inode(lower_file));
|
|
|
|
return rc;
|
|
default:
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static long
|
|
ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct file *lower_file = ecryptfs_file_to_lower(file);
|
|
long rc = -ENOIOCTLCMD;
|
|
long sdp_rc = -ENOIOCTLCMD;
|
|
|
|
#ifdef CONFIG_WTL_ENCRYPTION_FILTER
|
|
if (cmd == ECRYPTFS_IOCTL_GET_ATTRIBUTES) {
|
|
u32 __user *user_attr = (u32 __user *)arg;
|
|
u32 attr = 0;
|
|
char filename[NAME_MAX+1] = {0};
|
|
struct dentry *ecryptfs_dentry = file->f_path.dentry;
|
|
struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
|
|
&ecryptfs_superblock_to_private(ecryptfs_dentry->d_sb)
|
|
->mount_crypt_stat;
|
|
|
|
struct inode *inode = ecryptfs_dentry->d_inode;
|
|
struct ecryptfs_crypt_stat *crypt_stat =
|
|
&ecryptfs_inode_to_private(inode)->crypt_stat;
|
|
struct dentry *fp_dentry =
|
|
ecryptfs_inode_to_private(inode)->lower_file->f_path.dentry;
|
|
if (fp_dentry->d_name.len <= NAME_MAX)
|
|
memcpy(filename, fp_dentry->d_name.name,
|
|
fp_dentry->d_name.len + 1);
|
|
|
|
mutex_lock(&crypt_stat->cs_mutex);
|
|
if ((crypt_stat->flags & ECRYPTFS_ENCRYPTED
|
|
|| crypt_stat->flags & ECRYPTFS_ENCRYPTED_OTHER_DEVICE)
|
|
|| ((mount_crypt_stat->flags
|
|
& ECRYPTFS_ENABLE_FILTERING)
|
|
&& (is_file_name_match
|
|
(mount_crypt_stat, fp_dentry)
|
|
|| is_file_ext_match
|
|
(mount_crypt_stat, filename)))) {
|
|
if (crypt_stat->flags & ECRYPTFS_KEY_VALID)
|
|
attr = ECRYPTFS_WAS_ENCRYPTED;
|
|
else
|
|
attr = ECRYPTFS_WAS_ENCRYPTED_OTHER_DEVICE;
|
|
}
|
|
mutex_unlock(&crypt_stat->cs_mutex);
|
|
put_user(attr, user_attr);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SDP
|
|
sdp_rc = ecryptfs_do_sdp_ioctl(file, cmd, arg);
|
|
if (sdp_rc != -EOPNOTSUPP)
|
|
return sdp_rc;
|
|
#else
|
|
printk("%s CONFIG_SDP not enabled \n", __func__);
|
|
#endif
|
|
|
|
if (!lower_file->f_op->compat_ioctl)
|
|
return rc;
|
|
|
|
switch (cmd) {
|
|
case FS_IOC32_GETFLAGS:
|
|
case FS_IOC32_SETFLAGS:
|
|
case FS_IOC32_GETVERSION:
|
|
case FS_IOC32_SETVERSION:
|
|
rc = lower_file->f_op->compat_ioctl(lower_file, cmd, arg);
|
|
fsstack_copy_attr_all(file_inode(file), file_inode(lower_file));
|
|
|
|
return rc;
|
|
default:
|
|
return rc;
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_WTL_ENCRYPTION_FILTER
|
|
int is_file_name_match(struct ecryptfs_mount_crypt_stat *mcs,
|
|
struct dentry *fp_dentry)
|
|
{
|
|
int i;
|
|
char *str = NULL;
|
|
if (!(strcmp("/", fp_dentry->d_name.name))
|
|
|| !(strcmp("", fp_dentry->d_name.name)))
|
|
return 0;
|
|
str = kzalloc(mcs->max_name_filter_len + 1, GFP_KERNEL);
|
|
if (!str) {
|
|
printk(KERN_ERR "%s: Out of memory whilst attempting "
|
|
"to kzalloc [%d] bytes\n", __func__,
|
|
(mcs->max_name_filter_len + 1));
|
|
return 0;
|
|
}
|
|
|
|
for (i = 0; i < ENC_NAME_FILTER_MAX_INSTANCE; i++) {
|
|
int len = 0;
|
|
struct dentry *p = fp_dentry;
|
|
if (!strlen(mcs->enc_filter_name[i]))
|
|
break;
|
|
|
|
while (1) {
|
|
if (len == 0) {
|
|
len = strlen(p->d_name.name);
|
|
if (len > mcs->max_name_filter_len)
|
|
break;
|
|
strcpy(str, p->d_name.name);
|
|
} else {
|
|
len = len + 1 + strlen(p->d_name.name) ;
|
|
if (len > mcs->max_name_filter_len)
|
|
break;
|
|
strcat(str, "/");
|
|
strcat(str, p->d_name.name);
|
|
}
|
|
|
|
if (strncmp(str, mcs->enc_filter_name[i], len))
|
|
break;
|
|
p = p->d_parent;
|
|
|
|
if (!(strcmp("/", p->d_name.name))
|
|
|| !(strcmp("", p->d_name.name))) {
|
|
if (len == strlen(mcs->enc_filter_name[i])) {
|
|
kfree(str);
|
|
return 1;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
kfree(str);
|
|
return 0;
|
|
}
|
|
|
|
int is_file_ext_match(struct ecryptfs_mount_crypt_stat *mcs, char *str)
|
|
{
|
|
int i;
|
|
char ext[NAME_MAX + 1] = {0};
|
|
|
|
char *token;
|
|
int count = 0;
|
|
while ((token = strsep(&str, ".")) != NULL) {
|
|
strncpy(ext, token, NAME_MAX);
|
|
count++;
|
|
}
|
|
if (count <= 1)
|
|
return 0;
|
|
|
|
for (i = 0; i < ENC_EXT_FILTER_MAX_INSTANCE; i++) {
|
|
if (!strlen(mcs->enc_filter_ext[i]))
|
|
return 0;
|
|
if (strlen(ext) != strlen(mcs->enc_filter_ext[i]))
|
|
continue;
|
|
if (!strncmp(ext, mcs->enc_filter_ext[i], strlen(ext)))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
const struct file_operations ecryptfs_dir_fops = {
|
|
.iterate = ecryptfs_readdir,
|
|
.read = generic_read_dir,
|
|
.unlocked_ioctl = ecryptfs_unlocked_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = ecryptfs_compat_ioctl,
|
|
#endif
|
|
.open = ecryptfs_dir_open,
|
|
.release = ecryptfs_dir_release,
|
|
.fsync = ecryptfs_fsync,
|
|
.llseek = ecryptfs_dir_llseek,
|
|
};
|
|
|
|
const struct file_operations ecryptfs_main_fops = {
|
|
.llseek = generic_file_llseek,
|
|
.read_iter = ecryptfs_read_update_atime,
|
|
.write_iter = generic_file_write_iter,
|
|
.unlocked_ioctl = ecryptfs_unlocked_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = ecryptfs_compat_ioctl,
|
|
#endif
|
|
.mmap = ecryptfs_mmap,
|
|
.open = ecryptfs_open,
|
|
.flush = ecryptfs_flush,
|
|
.release = ecryptfs_release,
|
|
.fsync = ecryptfs_fsync,
|
|
.fasync = ecryptfs_fasync,
|
|
.splice_read = generic_file_splice_read,
|
|
};
|