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#!/bin/sh
### BEGIN INIT INFO
# Provides: fail2ban
# Required-Start: $local_fs $remote_fs
# Required-Stop: $local_fs $remote_fs
# Should-Start: $time $network $syslog $named iptables firehol shorewall ipmasq arno-iptables-firewall iptables-persistent ferm ufw
# Should-Stop: $network $syslog $named iptables firehol shorewall ipmasq arno-iptables-firewall iptables-persistent ferm ufw
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Start/stop fail2ban
# Description: Start/stop fail2ban, a daemon scanning the log files and
# banning potential attackers.
### END INIT INFO
# Author: Aaron Isotton <aaron@isotton.com>
# Modified: by Yaroslav Halchenko <debian@onerussian.com>
# reindented + minor corrections + to work on sarge without modifications
# Modified: by Glenn Aaldering <glenn@openvideo.nl>
# added exit codes for status command
# Modified: by Juan Karlo de Guzman <jkarlodg@gmail.com>
# corrected the DAEMON's path and the SOCKFILE
# rename this file: (sudo) mv /etc/init.d/fail2ban.init /etc/init.d/fail2ban
# same with the logrotate file: (sudo) mv /etc/logrotate.d/fail2ban.logrotate /etc/logrotate.d/fail2ban
#
PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/bin"
DESC="Authentication failure monitor"
NAME="fail2ban"
# fail2ban-client is not a daemon itself but starts a daemon and
# loads its with configuration
DAEMON="/usr/bin/$NAME-client"
SCRIPTNAME="/etc/init.d/$NAME"
# Ad-hoc way to parse out socket file name
SOCKFILE="$(grep -h '^[^#]*socket *=' "/etc/$NAME/$NAME.conf" "/etc/$NAME/$NAME.local" 2>/dev/null \
| tail -n 1 | sed -e 's/.*socket *= *//g' -e 's/ *$//g')"
[ -z "$SOCKFILE" ] && SOCKFILE="/run/fail2ban.sock"
# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0
# Run as root by default.
FAIL2BAN_USER="root"
# Read configuration variable file if it is present
[ -r "/etc/default/$NAME" ] && . "/etc/default/$NAME"
DAEMON_ARGS="$FAIL2BAN_OPTS"
# Load the VERBOSE setting and other rcS variables
[ -f /etc/default/rcS ] && . /etc/default/rcS
# Predefine what can be missing from lsb source later on -- necessary to run
# on sarge. Just present it in a bit more compact way from what was shipped
log_daemon_msg()
{
[ -z "$1" ] && return 1
echo -n "$1:"
[ -z "$2" ] || echo -n " $2"
}
# Define LSB log_* functions.
# Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
# Actually has to (>=2.0-7) present in sarge. log_daemon_msg is predefined
# so we must be ok
. /lib/lsb/init-functions
#
# Shortcut function for abnormal init script interruption
#
report_bug()
{
echo "$*"
echo "Please submit a bug report to Debian BTS (reportbug fail2ban)"
exit 1
}
#
# Helper function to check if socket is present, which is often left after
# abnormal exit of fail2ban and needs to be removed
#
check_socket()
{
# Return
# 0 if socket is present and readable
# 1 if socket file is not present
# 2 if socket file is present but not readable
# 3 if socket file is present but is not a socket
[ -e "$SOCKFILE" ] || return 1
[ -r "$SOCKFILE" ] || return 2
[ -S "$SOCKFILE" ] || return 3
return 0
}
#
# Function that starts the daemon/service
#
do_start()
{
# Return
# 0 if daemon has been started
# 1 if daemon was already running
# 2 if daemon could not be started
do_status && return 1
if [ -e "$SOCKFILE" ]; then
log_failure_msg "Socket file $SOCKFILE is present"
[ "$1" = force-start ] \
&& log_success_msg "Starting anyway as requested" \
|| return 2
DAEMON_ARGS="$DAEMON_ARGS -x"
fi
# Assure that /run/fail2ban exists
[ -d /run/fail2ban ] || mkdir -p /run/fail2ban
if [ "$FAIL2BAN_USER" != root ]; then
# Make the socket directory, IP lists and fail2ban log
# files writable by fail2ban
chown "$FAIL2BAN_USER" /run/fail2ban
# Create the logfile if it doesn't exist
touch /var/log/fail2ban.log
chown "$FAIL2BAN_USER" /var/log/fail2ban.log
find /proc/net/xt_recent -name "fail2ban-*" -exec chown "$FAIL2BAN_USER" "{}" ";"
fi
# $DAEMON_ARGS need to be expanded possibly with multiple or no options
# shellcheck disable=SC2086
start-stop-daemon --start --quiet --chuid "$FAIL2BAN_USER" --exec "$DAEMON" -- \
$DAEMON_ARGS start >/dev/null \
|| return 2
return 0
}
#
# Function that checks the status of fail2ban and returns
# corresponding code
#
do_status()
{
$DAEMON ping >/dev/null 2>&1
return "$?"
}
#
# Function that stops the daemon/service
#
do_stop()
{
# Return
# 0 if daemon has been stopped
# 1 if daemon was already stopped
# 2 if daemon could not be stopped
# other if a failure occurred
$DAEMON status >/dev/null 2>&1 || return 1
$DAEMON stop >/dev/null || return 2
# now we need actually to wait a bit since it might take time
# for server to react on client's stop request. Especially
# important for restart command on slow boxes
count=1
while do_status && [ "$count" -lt 60 ]; do
sleep 1
count="$((count + 1))"
done
[ "$count" -lt 60 ] || return 3 # failed to stop
return 0
}
#
# Function to reload configuration
#
do_reload()
{
"$DAEMON" reload >/dev/null && return 0 || return 1
return 0
}
# yoh:
# shortcut function to don't duplicate case statements and to don't use
# bashisms (arrays). Fixes #368218
#
log_end_msg_wrapper()
{
if [ "$1" != 0 ] && [ "$1" != "$2" ]; then
value="1"
else
value="0"
fi
if [ "$3" != no ]; then
log_end_msg "$value"
fi
if [ "$value" != 0 ]; then
exit "$1"
fi
}
command="$1"
case "$command" in
start|force-start)
[ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
do_start "$command"
log_end_msg_wrapper "$?" 255 "$VERBOSE"
;;
stop)
[ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
do_stop
log_end_msg_wrapper "$?" 255 "$VERBOSE"
;;
restart|force-reload)
log_daemon_msg "Restarting $DESC" "$NAME"
do_stop
case "$?" in
0|1)
do_start
log_end_msg_wrapper "$?" 0 always
;;
*)
# Failed to stop
log_end_msg 1
;;
esac
;;
reload)
log_daemon_msg "Reloading $DESC" "$NAME"
do_reload
log_end_msg "$?"
;;
status)
log_daemon_msg "Status of $DESC"
do_status
case "$?" in
0)
log_success_msg " $NAME is running"
;;
255)
check_socket
case "$?" in
1)
log_failure_msg " $NAME is not running" && exit 3
;;
0)
log_failure_msg " $NAME is not running but $SOCKFILE exists" && exit 3
;;
2)
log_failure_msg " $SOCKFILE not readable, status of $NAME is unknown" && exit 3
;;
3)
log_failure_msg " $SOCKFILE exists but not a socket, status of $NAME is unknown" && exit 3
;;
*)
report_bug "Unknown return code from $NAME:check_socket." && exit 4
;;
esac
;;
*)
report_bug "Unknown $NAME status code" && exit 4
;;
esac
;;
*)
echo "Usage: $SCRIPTNAME {start|force-start|stop|restart|force-reload|status}" 1>&2
exit 3
;;
esac
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