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#!/bin/bash
#
# This is the script that was used to create the image.gz in this directory.
#
# This requires a patched version of debugfs that understands the "fscrypt."
# xattr name prefix, so that the encryption xattrs can be manipulated.
set -e -u
umask 0022
do_debugfs() {
umount mnt
debugfs -w "$@" image
mount image mnt
}
create_encrypted_file() {
local file=$1
local ino
echo foo > "$file"
# not needed, but makes image more compressible
ino=$(stat -c %i "$file")
do_debugfs -R "zap_block -f <$ino> 0"
}
set_encryption_xattr() {
local file=$1
local value=$2
local ino
ino=$(stat -c %i "$file")
do_debugfs -R "ea_set <$ino> fscrypt.c $value"
}
rm_encryption_xattr() {
local file=$1
local ino
ino=$(stat -c %i "$file")
do_debugfs -R "ea_rm <$ino> fscrypt.c"
}
clear_encrypt_flag() {
local file=$1
local ino
ino=$(stat -c %i "$file")
do_debugfs -R "set_inode_field <$ino> flags 0"
}
clear_encryption() {
local file=$1
local ino
local is_symlink=false
if [ -L "$file" ]; then
is_symlink=true
fi
ino=$(stat -c %i "$file")
do_debugfs -R "ea_rm <$ino> fscrypt.c"
do_debugfs -R "set_inode_field <$ino> flags 0"
if $is_symlink; then
do_debugfs -R "set_inode_field <$ino> block[0] 0xAAAAAAAA"
do_debugfs -R "set_inode_field <$ino> block[1] 0"
do_debugfs -R "set_inode_field <$ino> size 4"
fi
}
mkdir -p mnt
umount mnt &> /dev/null || true
dd if=/dev/zero of=image bs=4096 count=128
mke2fs -O encrypt -b 4096 -N 128 image
mount image mnt
# Create an encrypted directory (ino 12)
dir=mnt/edir
mkdir $dir
echo password | e4crypt add_key $dir
# Control cases: valid encrypted regular file, dir, and symlink (ino 13-15)
create_encrypted_file $dir/encrypted_file
mkdir $dir/encrypted_dir
ln -s target $dir/encrypted_symlink
# Control case: file type that is never encrypted (ino 16)
mkfifo $dir/fifo
# Inodes with missing encryption xattr (ino 17-18).
# e2fsck should offer to clear the encrypt flag on these inodes.
create_encrypted_file $dir/missing_xattr_file
rm_encryption_xattr $dir/missing_xattr_file
mkdir $dir/missing_xattr_dir
rm_encryption_xattr $dir/missing_xattr_dir
# Inodes with corrupt encryption xattr (ino 19-22).
# e2fsck should offer to clear these inodes.
create_encrypted_file $dir/corrupt_xattr_1
set_encryption_xattr $dir/corrupt_xattr_1 '\0'
create_encrypted_file $dir/corrupt_xattr_2
set_encryption_xattr $dir/corrupt_xattr_2 \
'\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0'
create_encrypted_file $dir/corrupt_xattr_3
set_encryption_xattr $dir/corrupt_xattr_3 '\1'
create_encrypted_file $dir/corrupt_xattr_4
set_encryption_xattr $dir/corrupt_xattr_4 '\2'
# Unencrypted inodes in encrypted directory (ino 23-25).
# e2fsck should offer to clear these directory entries.
create_encrypted_file $dir/unencrypted_file
clear_encryption $dir/unencrypted_file
mkdir $dir/unencrypted_dir
clear_encryption $dir/unencrypted_dir
ln -s target $dir/unencrypted_symlink
clear_encryption $dir/unencrypted_symlink
# Inodes with different encryption policy in encrypted directory (ino 26-29).
# e2fsck should offer to clear these directory entries.
xattr='\1\1\4\0AAAAAAAABBBBBBBBBBBBBBBB'
create_encrypted_file $dir/inconsistent_file_1
set_encryption_xattr $dir/inconsistent_file_1 $xattr
mkdir $dir/inconsistent_dir
set_encryption_xattr $dir/inconsistent_dir $xattr
ln -s target $dir/inconsistent_symlink
set_encryption_xattr $dir/inconsistent_symlink $xattr
xattr='\2\1\4\0\0\0\0\0AAAAAAAAAAAAAAAABBBBBBBBBBBBBBBB'
create_encrypted_file $dir/inconsistent_file_2
set_encryption_xattr $dir/inconsistent_file_2 $xattr
# Encrypted file and directory with valid v2 encryption policy (ino 30-31).
# e2fsck shouldn't change these.
dir2=mnt/edir2
mkdir $dir2
echo password | e4crypt add_key $dir2
xattr='\2\1\4\0\0\0\0\0AAAAAAAAAAAAAAAABBBBBBBBBBBBBBBB'
create_encrypted_file $dir2/file
set_encryption_xattr $dir2/file $xattr
set_encryption_xattr $dir2 $xattr
# Encrypted file and directory with unrecognized encryption policy version
# (ino 32-33). e2fsck shouldn't change these.
dir3=mnt/edir3
mkdir $dir3
echo password | e4crypt add_key $dir3
xattr='\3'
create_encrypted_file $dir3/file
set_encryption_xattr $dir3/file $xattr
set_encryption_xattr $dir3 $xattr
umount mnt
rmdir mnt
gzip -9 -f image
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