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S01fail2ban
#!/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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