#!/bin/bash

[ -z "$CRYPTSETUP_PATH" ] && CRYPTSETUP_PATH=".."
CRYPTSETUP=$CRYPTSETUP_PATH/cryptsetup
CRYPTSETUP_SSH=$CRYPTSETUP_PATH/cryptsetup-ssh
IMG="ssh_test.img"
MAP="sshtest"
USER="sshtest"
PASSWD="sshtest"
LOOPDEV=$(losetup -f 2>/dev/null)
SSH_OPTIONS="-o StrictHostKeyChecking=no"

SSH_SERVER="localhost"
SSH_PATH="/home/$USER/keyfile"
SSH_KEY_PATH="$HOME/sshtest-key"

FAST_PBKDF_OPT="--pbkdf pbkdf2 --pbkdf-force-iterations 1000"

[ -z "$srcdir" ] && srcdir="."

function remove_mapping()
{
	[ -b /dev/mapper/$MAP ] && dmsetup remove --retry $MAP
        losetup -d $LOOPDEV >/dev/null 2>&1
        rm -f $IMG >/dev/null 2>&1
}

function remove_user()
{
        id -u $USER >/dev/null 2>&1 && userdel -r -f $USER >/dev/null 2>&1
        rm -f $SSH_KEY_PATH "$SSH_KEY_PATH.pub" >/dev/null 2>&1
}

function create_user()
{
        id -u $USER >/dev/null 2>&1
        [ $? -eq 0 ] && skip "User account $USER exists, aborting."
        [ -f $SSH_KEY_PATH ] && skip "SSH key $SSH_KEY_PATH already exists, aborting."

        useradd -m $USER -p $(openssl passwd -crypt $PASSWD) || skip "Failed to add user for SSH plugin test."

        ssh-keygen -f $SSH_KEY_PATH -q -N "" >/dev/null 2>&1
        [ $? -ne 0 ] && remove_user && skip "Failed to create SSH key."
}

function ssh_check()
{
        # try to use netcat to check port 22
        nc -zv $SSH_SERVER 22 >/dev/null 2>&1 || skip "SSH server does not seem to be running, skipping."
}

function bin_check()
{
	which $1 >/dev/null 2>&1 || skip "WARNING: test require $1 binary, test skipped."
}

function ssh_setup()
{
        # ssh-copy-id
        sshpass -p $PASSWD ssh-copy-id -i $SSH_KEY_PATH $SSH_OPTIONS $USER@$SSH_SERVER >/dev/null 2>&1
        [ $? -ne 0 ] && remove_user && skip "Failed to copy SSH key."

        # try to ssh and also create keyfile
        ssh -i $SSH_KEY_PATH $SSH_OPTIONS -o BatchMode=yes -n $USER@$SSH_SERVER -f "echo -n $PASSWD > $SSH_PATH" >/dev/null 2>&1
        [ $? -ne 0 ] && remove_user && skip "Failed to connect using SSH."
}

function fail()
{
	echo "[FAILED]"
        [ -n "$1" ] && echo "$1"
	echo "FAILED backtrace:"
	while caller $frame; do ((frame++)); done
	remove_mapping
        remove_user
	exit 2
}

function skip()
{
	[ -n "$1" ] && echo "$1"
	exit 77
}

format()
{
	dd if=/dev/zero of=$IMG bs=1M count=32 >/dev/null 2>&1
	sync
	losetup $LOOPDEV $IMG

	echo $PASSWD | $CRYPTSETUP luksFormat --type luks2 $FAST_PBKDF_OPT $LOOPDEV -q
	[ $? -ne 0 ] && fail "Format failed."
}

check_dump()
{
        dump=$1

        token=$(echo "$dump" | grep Tokens -A 1 | tail -1 | cut -d: -f2 | tr -d "\t\n ")
        [ "$token" = "ssh"  ] || fail " token check from dump failed."

        server=$(echo "$dump" | grep ssh_server | cut -d: -f2 | tr -d "\t\n ")
        [ "$server" = $SSH_SERVER ] || fail " server check from dump failed."

        user=$(echo "$dump" | grep ssh_user | cut -d: -f2 | tr -d "\t\n ")
        [ "$user" = "$USER"  ] || fail " user check from dump failed."

        path=$(echo "$dump" | grep ssh_path | cut -d: -f2 | tr -d "\t\n ")
        [ "$path" = "$SSH_PATH"  ] || fail " path check from dump failed."

        key_path=$(echo "$dump" | grep ssh_key_path | cut -d: -f2 | tr -d "\t\n ")
        [ "$key_path" = "$SSH_KEY_PATH"  ] || fail " key_path check from dump failed."
}

[ $(id -u) != 0 ] && skip "WARNING: You must be root to run this test, test skipped."

# Prevent running dangerous useradd operation by default
[ -z "$RUN_SSH_PLUGIN_TEST" ] && skip "WARNING: Variable RUN_SSH_PLUGIN_TEST must be defined, test skipped."

bin_check nc
bin_check useradd
bin_check ssh
bin_check ssh-keygen
bin_check sshpass

format

echo -n "Adding SSH token: "
$CRYPTSETUP_SSH add $LOOPDEV --ssh-server $SSH_SERVER --ssh-user $USER --ssh-path $SSH_PATH --ssh-keypath $SSH_KEY_PATH
[ $? -ne 0 ] && fail "Failed to add SSH token to $LOOPDEV"

out=$($CRYPTSETUP luksDump $LOOPDEV)
check_dump "$out"
echo "[OK]"

echo -n "Activating using SSH token: "
ssh_check
create_user
ssh_setup

$CRYPTSETUP luksOpen --token-only --disable-external-tokens -r $LOOPDEV $MAP && fail "Tokens should be disabled"
$CRYPTSETUP luksOpen -r $LOOPDEV $MAP -q >/dev/null 2>&1 <&-
[ $? -ne 0 ] && fail "Failed to open $LOOPDEV using SSH token"
echo "[OK]"

remove_mapping
remove_user