#!/bin/sh -e
# ecryptfs-verify
# Copyright (C) 2011 Dustin Kirkland <[email protected]>
#
# Authors: Dustin Kirkland <[email protected]>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.

error() {
echo `gettext "ERROR:"` "$@" 1>&2
echo `gettext "ERROR:"` "Configuration invalid" 1>&2
exit 1
}

info() {
echo `gettext "INFO:"` "$@"
}

usage() {
echo "
Usage:
ecryptfs-verify [-h|--home] [-p|--private] [-e|--filenames-encrypted] [-n|--filenames-not-encrypted] [-u|--user USER] [--help]

-h|--home True if HOME is correctly configured for
encryption, False otherwise

-p|--private True if a non-HOME directory is correctly
configured for encryption, False otherwise

-e|--filenames-encrypted True if filenames are set for encryption,
False otherwise

-n|--filenames-not-encrypted True if filenames are not encrypted,
False otherwise

-u|--user USER By default, the current user's configuration
is checked, override with this option

--help This usage information

Note that options are additive. ALL checks must pass in order for this
program to exit 0. Any failing check will cause this program to exit
non-zero.

"
return 1
}

ecryptfs_exists() {
local dotecryptfs="$1/.ecryptfs"
if [ -d "$dotecryptfs" ]; then
info "[$dotecryptfs] exists"
else
error "[$dotecryptfs] does not exist"
fi
return 0
}

sigfile_valid() {
local sigfile="$1/.ecryptfs/Private.sig"
if [ -f "$sigfile" ]; then
info "[$sigfile] exists"
else
error "[$sigfile] does not exist"
fi
local c=$(wc -l "$sigfile" | awk '{print $1}')
if [ "$c" = "1" ] || [ "$c" = "2" ]; then
info "[$sigfile] contains [$c] signatures"
else
error "[$sigfile] does not contain exactly 1 or 2 lines"
fi
return 0
}

mountfile_valid() {
local mountfile="$1/.ecryptfs/Private.mnt"
if [ -f "$mountfile" ]; then
info "[$mountfile] exists"
else
error "[$mountfile] does not exist"
fi
local m=$(cat "$mountfile")
if [ -d "$m" ]; then
info "[$m] is a directory"
else
error "[$m] is not a directory"
fi
return 0
}

automount_true() {
local home="$1"
local automount="$1/.ecryptfs/auto-mount"
if [ -f "$automount" ]; then
info "[$automount] Automount is set"
else
error "[$home/.ecryptfs/auto-mount] does not exist"
fi
return 0
}

owns_mountpoint() {
local owner=$(stat -c "%U" "$2")
if [ "$owner" = "$1" ]; then
info "Ownership [$owner] of mount point [$2] is correct"
else
error "Invalid owner [$owner] of mount point [$2]"
fi
}

mount_is_home() {
local home="$1"
local mountfile="$home/.ecryptfs/Private.mnt"
local m=$(cat "$mountfile")
if [ "$m" = "$home" ]; then
info "Mount point [$m] is the user's home"
else
error "Mount point [$m] is not the user's home [$home]"
fi
owns_mountpoint "$user" "$m"
return 0
}

mount_is_private() {
local home="$1"
local mountfile="$home/.ecryptfs/Private.mnt"
local m=$(cat "$mountfile")
if [ "$m" != "$home" ]; then
info "Mount point [$m] is not the user's home [$home]"
else
error "Mount point [$m] is the user's home"
fi
if [ -d "$m" ]; then
info "Mount point [$m] is a valid directory"
else
error "[$m] is not a valid mount point"
fi
owns_mountpoint "$user" "$m"
return 0
}

filenames_encrypted() {
local sigfile="$1/.ecryptfs/Private.sig"
local c=$(wc -l "$sigfile" | awk '{print $1}')
if [ "$c" = "2" ]; then
info "Filenames are encrypted"
else
error "Filenames are not encrypted"
fi
return 0
}

filenames_not_encrypted() {
local sigfile="$1/.ecryptfs/Private.sig"
local c=$(wc -l "$sigfile" | awk '{print $1}')
if [ "$c" = "1" ]; then
info "Filenames are not encrypted"
else
error "Filenames are encrypted"
fi
return 0
}

home="$HOME"
user="$USER"
checks=
while [ ! -z "$1" ]; do
case "$1" in
-h|--home)
checks="$checks check_home"
shift
;;
-p|--private)
checks="$checks check_private"
shift
;;
-e|--filenames-encrypted)
checks="$checks check_filenames_encrypted"
shift
;;
-n|--filenames-not-encrypted)
checks="$checks check_filenames_not_encrypted"
shift
;;
--help)
usage
;;
-u|--user)
user="$2"
home=$(getent passwd "$user" | awk -F: '{print $6}')
if [ ! -d "$home" ]; then
error "Invalid home directory [$home] of [$user]"
fi
shift 2
;;
esac
done

if [ -z "$checks" ]; then
error "No checks given"
fi

for i in $checks; do
case "$i" in
check_home)
ecryptfs_exists "$home"
sigfile_valid "$home"
mountfile_valid "$home"
automount_true "$home"
mount_is_home "$home"
;;
check_private)
ecryptfs_exists "$home"
sigfile_valid "$home"
mountfile_valid "$home"
mount_is_private "$home"
;;
check_filenames_encrypted)
ecryptfs_exists "$home"
sigfile_valid "$home"
filenames_encrypted "$home"
;;
check_filenames_not_encrypted)
ecryptfs_exists "$home"
sigfile_valid "$home"
filenames_not_encrypted "$home"
;;
*)
error "Invalid check [$i]"
;;
esac
done

info "Configuration valid"
exit 0