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