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476 lines
11 KiB
476 lines
11 KiB
#!/bin/bash |
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# |
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# iptables Start iptables firewall |
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# |
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# chkconfig: 2345 08 92 |
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# description: Starts, stops and saves iptables firewall |
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# |
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# config: /etc/sysconfig/iptables |
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# config: /etc/sysconfig/iptables-config |
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# |
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### BEGIN INIT INFO |
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# Provides: iptables |
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# Required-Start: |
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# Required-Stop: |
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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 and stop iptables firewall |
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# Description: Start, stop and save iptables firewall |
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### END INIT INFO |
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# Source function library. |
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. /etc/init.d/functions |
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IPTABLES=iptables |
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IPTABLES_DATA=/etc/sysconfig/$IPTABLES |
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IPTABLES_FALLBACK_DATA=${IPTABLES_DATA}.fallback |
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IPTABLES_CONFIG=/etc/sysconfig/${IPTABLES}-config |
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IPV=${IPTABLES%tables} # ip for ipv4 | ip6 for ipv6 |
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[ "$IPV" = "ip" ] && _IPV="ipv4" || _IPV="ipv6" |
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PROC_IPTABLES_NAMES=/proc/net/${IPV}_tables_names |
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VAR_SUBSYS_IPTABLES=/var/lock/subsys/$IPTABLES |
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RESTORECON=$(which restorecon 2>/dev/null) |
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[ ! -x "$RESTORECON" ] && RESTORECON=/bin/true |
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# only usable for root |
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if [ $EUID != 0 ]; then |
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echo -n $"${IPTABLES}: Only usable by root."; warning; echo |
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exit 4 |
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fi |
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if [ ! -x /sbin/$IPTABLES ]; then |
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echo -n $"${IPTABLES}: /sbin/$IPTABLES does not exist."; warning; echo |
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exit 5 |
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fi |
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# Old or new modutils |
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/sbin/modprobe --version 2>&1 | grep -q 'kmod version' \ |
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&& NEW_MODUTILS=1 \ |
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|| NEW_MODUTILS=0 |
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# Default firewall configuration: |
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IPTABLES_MODULES="" |
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IPTABLES_MODULES_UNLOAD="yes" |
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IPTABLES_SAVE_ON_STOP="no" |
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IPTABLES_SAVE_ON_RESTART="no" |
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IPTABLES_SAVE_COUNTER="no" |
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IPTABLES_STATUS_NUMERIC="yes" |
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IPTABLES_STATUS_VERBOSE="no" |
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IPTABLES_STATUS_LINENUMBERS="yes" |
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IPTABLES_SYSCTL_LOAD_LIST="" |
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IPTABLES_RESTORE_WAIT=600 |
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IPTABLES_RESTORE_WAIT_INTERVAL=1000000 |
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# Load firewall configuration. |
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[ -f "$IPTABLES_CONFIG" ] && . "$IPTABLES_CONFIG" |
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# Netfilter modules |
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NF_MODULES=($(lsmod | awk "/^${IPV}table_/ {print \$1}") ${IPV}_tables) |
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NF_MODULES_COMMON=(x_tables nf_nat nf_conntrack) # Used by netfilter v4 and v6 |
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# Get active tables |
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NF_TABLES=$(cat "$PROC_IPTABLES_NAMES" 2>/dev/null) |
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rmmod_r() { |
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# Unload module with all referring modules. |
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# At first all referring modules will be unloaded, then the module itself. |
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local mod=$1 |
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local ret=0 |
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local ref= |
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# Get referring modules. |
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# New modutils have another output format. |
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[ $NEW_MODUTILS = 1 ] \ |
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&& ref=$(lsmod | awk "/^${mod}/ { print \$4; }" | tr ',' ' ') \ |
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|| ref=$(lsmod | grep ^${mod} | cut -d "[" -s -f 2 | cut -d "]" -s -f 1) |
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# recursive call for all referring modules |
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for i in $ref; do |
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rmmod_r $i |
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let ret+=$?; |
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done |
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# Unload module. |
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# The extra test is for 2.6: The module might have autocleaned, |
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# after all referring modules are unloaded. |
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if grep -q "^${mod}" /proc/modules ; then |
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modprobe -r $mod > /dev/null 2>&1 |
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res=$? |
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[ $res -eq 0 ] || echo -n " $mod" |
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let ret+=$res; |
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fi |
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return $ret |
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} |
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flush_n_delete() { |
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# Flush firewall rules and delete chains. |
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[ ! -e "$PROC_IPTABLES_NAMES" ] && return 0 |
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# Check if firewall is configured (has tables) |
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[ -z "$NF_TABLES" ] && return 1 |
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echo -n $"${IPTABLES}: Flushing firewall rules: " |
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ret=0 |
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# For all tables |
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for i in $NF_TABLES; do |
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# Flush firewall rules. |
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$IPTABLES -t $i -F; |
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let ret+=$?; |
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# Delete firewall chains. |
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$IPTABLES -t $i -X; |
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let ret+=$?; |
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# Set counter to zero. |
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$IPTABLES -t $i -Z; |
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let ret+=$?; |
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done |
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[ $ret -eq 0 ] && success || failure |
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echo |
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return $ret |
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} |
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set_policy() { |
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# Set policy for configured tables. |
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policy=$1 |
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# Check if iptable module is loaded |
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[ ! -e "$PROC_IPTABLES_NAMES" ] && return 0 |
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# Check if firewall is configured (has tables) |
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tables=$(cat "$PROC_IPTABLES_NAMES" 2>/dev/null) |
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[ -z "$tables" ] && return 1 |
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echo -n $"${IPTABLES}: Setting chains to policy $policy: " |
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ret=0 |
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for i in $tables; do |
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echo -n "$i " |
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case "$i" in |
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raw) |
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$IPTABLES -t raw -P PREROUTING $policy \ |
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&& $IPTABLES -t raw -P OUTPUT $policy \ |
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|| let ret+=1 |
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;; |
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filter) |
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$IPTABLES -t filter -P INPUT $policy \ |
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&& $IPTABLES -t filter -P OUTPUT $policy \ |
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&& $IPTABLES -t filter -P FORWARD $policy \ |
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|| let ret+=1 |
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;; |
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nat) |
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$IPTABLES -t nat -P PREROUTING $policy \ |
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&& $IPTABLES -t nat -P POSTROUTING $policy \ |
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&& $IPTABLES -t nat -P OUTPUT $policy \ |
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|| let ret+=1 |
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;; |
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mangle) |
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$IPTABLES -t mangle -P PREROUTING $policy \ |
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&& $IPTABLES -t mangle -P POSTROUTING $policy \ |
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&& $IPTABLES -t mangle -P INPUT $policy \ |
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&& $IPTABLES -t mangle -P OUTPUT $policy \ |
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&& $IPTABLES -t mangle -P FORWARD $policy \ |
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|| let ret+=1 |
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;; |
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*) |
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let ret+=1 |
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;; |
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esac |
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done |
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[ $ret -eq 0 ] && success || failure |
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echo |
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return $ret |
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} |
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load_sysctl() { |
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# load matched sysctl values |
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if [ -n "$IPTABLES_SYSCTL_LOAD_LIST" ]; then |
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echo -n $"Loading sysctl settings: " |
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ret=0 |
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for item in $IPTABLES_SYSCTL_LOAD_LIST; do |
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fgrep -hs $item /etc/sysctl.d/* | sysctl -p - >/dev/null |
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let ret+=$?; |
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done |
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[ $ret -eq 0 ] && success || failure |
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echo |
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fi |
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return $ret |
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} |
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start() { |
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# Do not start if there is no config file. |
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if [ ! -f "$IPTABLES_DATA" ]; then |
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echo -n $"${IPTABLES}: No config file."; warning; echo |
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return 6 |
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fi |
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# check if ipv6 module load is deactivated |
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if [ "${_IPV}" = "ipv6" ] \ |
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&& grep -qIsE "^install[[:space:]]+${_IPV}[[:space:]]+/bin/(true|false)" /etc/modprobe.conf /etc/modprobe.d/* ; then |
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echo $"${IPTABLES}: ${_IPV} is disabled." |
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return 150 |
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fi |
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echo -n $"${IPTABLES}: Applying firewall rules: " |
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OPT= |
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[ "x$IPTABLES_SAVE_COUNTER" = "xyes" ] && OPT="-c" |
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if [ $IPTABLES_RESTORE_WAIT -ne 0 ]; then |
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OPT="${OPT} --wait ${IPTABLES_RESTORE_WAIT}" |
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if [ $IPTABLES_RESTORE_WAIT_INTERVAL -lt 1000000 ]; then |
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OPT="${OPT} --wait-interval ${IPTABLES_RESTORE_WAIT_INTERVAL}" |
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fi |
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fi |
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$IPTABLES-restore $OPT $IPTABLES_DATA |
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if [ $? -eq 0 ]; then |
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success; echo |
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else |
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failure; echo; |
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if [ -f "$IPTABLES_FALLBACK_DATA" ]; then |
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echo -n $"${IPTABLES}: Applying firewall fallback rules: " |
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$IPTABLES-restore $OPT $IPTABLES_FALLBACK_DATA |
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if [ $? -eq 0 ]; then |
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success; echo |
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else |
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failure; echo; return 1 |
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fi |
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else |
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return 1 |
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fi |
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fi |
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# Load additional modules (helpers) |
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if [ -n "$IPTABLES_MODULES" ]; then |
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echo -n $"${IPTABLES}: Loading additional modules: " |
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ret=0 |
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for mod in $IPTABLES_MODULES; do |
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echo -n "$mod " |
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modprobe $mod > /dev/null 2>&1 |
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let ret+=$?; |
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done |
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[ $ret -eq 0 ] && success || failure |
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echo |
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fi |
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# Load sysctl settings |
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load_sysctl |
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touch $VAR_SUBSYS_IPTABLES |
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return $ret |
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} |
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stop() { |
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# Do not stop if iptables module is not loaded. |
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[ ! -e "$PROC_IPTABLES_NAMES" ] && return 0 |
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# Set default chain policy to ACCEPT, in order to not break shutdown |
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# on systems where the default policy is DROP and root device is |
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# network-based (i.e.: iSCSI, NFS) |
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set_policy ACCEPT |
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# And then, flush the rules and delete chains |
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flush_n_delete |
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if [ "x$IPTABLES_MODULES_UNLOAD" = "xyes" ]; then |
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echo -n $"${IPTABLES}: Unloading modules: " |
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ret=0 |
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for mod in ${NF_MODULES[*]}; do |
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rmmod_r $mod |
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let ret+=$?; |
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done |
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# try to unload remaining netfilter modules used by ipv4 and ipv6 |
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# netfilter |
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for mod in ${NF_MODULES_COMMON[*]}; do |
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rmmod_r $mod >/dev/null |
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done |
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[ $ret -eq 0 ] && success || failure |
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echo |
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fi |
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rm -f $VAR_SUBSYS_IPTABLES |
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return $ret |
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} |
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save() { |
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# Check if iptable module is loaded |
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if [ ! -e "$PROC_IPTABLES_NAMES" ]; then |
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echo -n $"${IPTABLES}: Nothing to save."; warning; echo |
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return 0 |
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fi |
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# Check if firewall is configured (has tables) |
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if [ -z "$NF_TABLES" ]; then |
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echo -n $"${IPTABLES}: Nothing to save."; warning; echo |
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return 6 |
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fi |
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echo -n $"${IPTABLES}: Saving firewall rules to $IPTABLES_DATA: " |
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OPT= |
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[ "x$IPTABLES_SAVE_COUNTER" = "xyes" ] && OPT="-c" |
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ret=0 |
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TMP_FILE=$(/bin/mktemp -q $IPTABLES_DATA.XXXXXX) \ |
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&& chmod 600 "$TMP_FILE" \ |
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&& $IPTABLES-save $OPT > $TMP_FILE 2>/dev/null \ |
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&& size=$(stat -c '%s' $TMP_FILE) && [ $size -gt 0 ] \ |
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|| ret=1 |
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if [ $ret -eq 0 ]; then |
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if [ -e $IPTABLES_DATA ]; then |
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cp -f $IPTABLES_DATA $IPTABLES_DATA.save \ |
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&& chmod 600 $IPTABLES_DATA.save \ |
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&& $RESTORECON $IPTABLES_DATA.save \ |
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|| ret=1 |
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fi |
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if [ $ret -eq 0 ]; then |
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mv -f $TMP_FILE $IPTABLES_DATA \ |
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&& chmod 600 $IPTABLES_DATA \ |
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&& $RESTORECON $IPTABLES_DATA \ |
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|| ret=1 |
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fi |
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fi |
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rm -f $TMP_FILE |
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[ $ret -eq 0 ] && success || failure |
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echo |
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return $ret |
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} |
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status() { |
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if [ ! -f "$VAR_SUBSYS_IPTABLES" -a -z "$NF_TABLES" ]; then |
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echo $"${IPTABLES}: Firewall is not running." |
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return 3 |
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fi |
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# Do not print status if lockfile is missing and iptables modules are not |
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# loaded. |
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# Check if iptable modules are loaded |
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if [ ! -e "$PROC_IPTABLES_NAMES" ]; then |
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echo $"${IPTABLES}: Firewall modules are not loaded." |
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return 3 |
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fi |
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# Check if firewall is configured (has tables) |
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if [ -z "$NF_TABLES" ]; then |
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echo $"${IPTABLES}: Firewall is not configured. " |
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return 3 |
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fi |
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NUM= |
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[ "x$IPTABLES_STATUS_NUMERIC" = "xyes" ] && NUM="-n" |
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VERBOSE= |
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[ "x$IPTABLES_STATUS_VERBOSE" = "xyes" ] && VERBOSE="--verbose" |
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COUNT= |
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[ "x$IPTABLES_STATUS_LINENUMBERS" = "xyes" ] && COUNT="--line-numbers" |
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for table in $NF_TABLES; do |
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echo $"Table: $table" |
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$IPTABLES -t $table --list $NUM $VERBOSE $COUNT && echo |
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done |
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return 0 |
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} |
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reload() { |
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# Do not reload if there is no config file. |
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if [ ! -f "$IPTABLES_DATA" ]; then |
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echo -n $"${IPTABLES}: No config file."; warning; echo |
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return 6 |
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fi |
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# check if ipv6 module load is deactivated |
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if [ "${_IPV}" = "ipv6" ] \ |
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&& grep -qIsE "^install[[:space:]]+${_IPV}[[:space:]]+/bin/(true|false)" /etc/modprobe.conf /etc/modprobe.d/* ; then |
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echo $"${IPTABLES}: ${_IPV} is disabled." |
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return 150 |
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fi |
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echo -n $"${IPTABLES}: Trying to reload firewall rules: " |
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OPT= |
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[ "x$IPTABLES_SAVE_COUNTER" = "xyes" ] && OPT="-c" |
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if [ $IPTABLES_RESTORE_WAIT -ne 0 ]; then |
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OPT="${OPT} --wait ${IPTABLES_RESTORE_WAIT}" |
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if [ $IPTABLES_RESTORE_WAIT_INTERVAL -lt 1000000 ]; then |
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OPT="${OPT} --wait-interval ${IPTABLES_RESTORE_WAIT_INTERVAL}" |
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fi |
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fi |
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$IPTABLES-restore $OPT $IPTABLES_DATA |
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if [ $? -eq 0 ]; then |
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success; echo |
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else |
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failure; echo; echo "Firewall rules are not changed."; return 1 |
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fi |
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# Load additional modules (helpers) |
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if [ -n "$IPTABLES_MODULES" ]; then |
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echo -n $"${IPTABLES}: Loading additional modules: " |
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ret=0 |
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for mod in $IPTABLES_MODULES; do |
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echo -n "$mod " |
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modprobe $mod > /dev/null 2>&1 |
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let ret+=$?; |
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done |
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[ $ret -eq 0 ] && success || failure |
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echo |
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fi |
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# Load sysctl settings |
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load_sysctl |
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return $ret |
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} |
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restart() { |
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[ "x$IPTABLES_SAVE_ON_RESTART" = "xyes" ] && save |
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stop |
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start |
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} |
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case "$1" in |
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start) |
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[ -f "$VAR_SUBSYS_IPTABLES" ] && exit 0 |
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start |
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RETVAL=$? |
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;; |
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stop) |
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[ "x$IPTABLES_SAVE_ON_STOP" = "xyes" ] && save |
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stop |
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RETVAL=$? |
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;; |
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restart|force-reload) |
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restart |
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RETVAL=$? |
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;; |
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reload) |
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[ -e "$VAR_SUBSYS_IPTABLES" ] && reload |
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RETVAL=$? |
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;; |
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condrestart|try-restart) |
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[ ! -e "$VAR_SUBSYS_IPTABLES" ] && exit 0 |
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restart |
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RETVAL=$? |
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;; |
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status) |
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status |
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RETVAL=$? |
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;; |
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panic) |
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set_policy DROP |
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RETVAL=$? |
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;; |
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save) |
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save |
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RETVAL=$? |
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;; |
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*) |
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echo $"Usage: ${IPTABLES} {start|stop|reload|restart|condrestart|status|panic|save}" |
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RETVAL=2 |
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;; |
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esac |
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exit $RETVAL
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