451 lines
10 KiB
Bash
Executable File
451 lines
10 KiB
Bash
Executable File
#!/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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# compat for removed initscripts dependency
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success() {
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echo -n "[ OK ]"
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return 0
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}
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warning() {
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echo -n "[WARNING]"
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return 1
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}
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failure() {
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echo -n "[FAILED]"
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return 1
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}
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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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# 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/$IPTABLES does not exist."; warning; echo
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exit 5
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fi
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# Default firewall configuration:
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IPTABLES_MODULES=""
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IPTABLES_SAVE_ON_STOP="no"
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IPTABLES_SAVE_ON_RESTART="no"
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IPTABLES_SAVE_COUNTER="no"
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IPTABLES_STATUS_NUMERIC="yes"
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IPTABLES_STATUS_VERBOSE="no"
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IPTABLES_STATUS_LINENUMBERS="yes"
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IPTABLES_SYSCTL_LOAD_LIST=""
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IPTABLES_RESTORE_WAIT=600
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IPTABLES_RESTORE_WAIT_INTERVAL=1000000
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# Load firewall configuration.
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[ -f "$IPTABLES_CONFIG" ] && . "$IPTABLES_CONFIG"
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is_iptables_nft() {
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iptables --version | grep -q '(nf_tables)'
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}
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netfilter_active() {
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is_iptables_nft && return 0
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[ -e "$PROC_IPTABLES_NAMES" ]
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}
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netfilter_tables() {
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netfilter_active || return 1
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is_iptables_nft && {
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# explicitly omit security table from this list as
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# it should be reserved for SELinux use
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echo "raw mangle filter nat"
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return 0
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}
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cat "$PROC_IPTABLES_NAMES" 2>/dev/null
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}
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# Get active tables
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NF_TABLES=$(netfilter_tables)
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flush_n_delete() {
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# Flush firewall rules and delete chains.
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netfilter_active || 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=$1
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# Check if iptable module is loaded
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netfilter_active || return 0
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# Check if firewall is configured (has tables)
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tables=$(netfilter_tables)
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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 $item /etc/sysctl.d/*.conf | sysctl -p - >/dev/null
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let ret+=$?;
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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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netfilter_active || 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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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 ! netfilter_active; 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" ]; 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 ! netfilter_active; 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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