375 lines
8.7 KiB
Bash
Executable File
375 lines
8.7 KiB
Bash
Executable File
#!/bin/bash
|
|
#
|
|
# iptables Start iptables firewall
|
|
#
|
|
# chkconfig: 2345 08 92
|
|
# description: Starts, stops and saves iptables firewall
|
|
#
|
|
# config: /etc/sysconfig/iptables
|
|
# config: /etc/sysconfig/iptables-config
|
|
#
|
|
### BEGIN INIT INFO
|
|
# Provides: iptables
|
|
# Required-Start:
|
|
# Required-Stop:
|
|
# Default-Start: 2 3 4 5
|
|
# Default-Stop: 0 1 6
|
|
# Short-Description: start and stop iptables firewall
|
|
# Description: Start, stop and save iptables firewall
|
|
### END INIT INFO
|
|
|
|
# Source function library.
|
|
. /etc/init.d/functions
|
|
|
|
IPTABLES=iptables
|
|
IPTABLES_DATA=/etc/sysconfig/$IPTABLES
|
|
IPTABLES_FALLBACK_DATA=${IPTABLES_DATA}.fallback
|
|
IPTABLES_CONFIG=/etc/sysconfig/${IPTABLES}-config
|
|
IPV=${IPTABLES%tables} # ip for ipv4 | ip6 for ipv6
|
|
[ "$IPV" = "ip" ] && _IPV="ipv4" || _IPV="ipv6"
|
|
VAR_SUBSYS_IPTABLES=/var/lock/subsys/$IPTABLES
|
|
|
|
# only usable for root
|
|
if [ $EUID != 0 ]; then
|
|
echo -n $"${IPTABLES}: Only usable by root."; warning; echo
|
|
exit 4
|
|
fi
|
|
|
|
if [ ! -x /sbin/$IPTABLES ]; then
|
|
echo -n $"${IPTABLES}: /sbin/$IPTABLES does not exist."; warning; echo
|
|
exit 5
|
|
fi
|
|
|
|
# Default firewall configuration:
|
|
IPTABLES_MODULES=""
|
|
IPTABLES_SAVE_ON_STOP="no"
|
|
IPTABLES_SAVE_ON_RESTART="no"
|
|
IPTABLES_SAVE_COUNTER="no"
|
|
IPTABLES_STATUS_NUMERIC="yes"
|
|
IPTABLES_STATUS_VERBOSE="no"
|
|
IPTABLES_STATUS_LINENUMBERS="yes"
|
|
IPTABLES_SYSCTL_LOAD_LIST=""
|
|
IPTABLES_RESTORE_WAIT=600
|
|
IPTABLES_RESTORE_WAIT_INTERVAL=1000000
|
|
|
|
# Load firewall configuration.
|
|
[ -f "$IPTABLES_CONFIG" ] && . "$IPTABLES_CONFIG"
|
|
|
|
# explicitly omit security table from this list as
|
|
# it should be reserved for SELinux use
|
|
NF_TABLES="raw mangle filter nat"
|
|
|
|
|
|
flush_n_delete() {
|
|
# Flush firewall rules and delete chains.
|
|
echo -n $"${IPTABLES}: Flushing firewall rules: "
|
|
ret=0
|
|
# For all tables
|
|
for i in $NF_TABLES; do
|
|
# Flush firewall rules.
|
|
$IPTABLES -t $i -F;
|
|
let ret+=$?;
|
|
|
|
# Delete firewall chains.
|
|
$IPTABLES -t $i -X;
|
|
let ret+=$?;
|
|
|
|
# Set counter to zero.
|
|
$IPTABLES -t $i -Z;
|
|
let ret+=$?;
|
|
done
|
|
|
|
[ $ret -eq 0 ] && success || failure
|
|
echo
|
|
return $ret
|
|
}
|
|
|
|
set_policy() {
|
|
# Set policy for configured tables.
|
|
policy=$1
|
|
echo -n $"${IPTABLES}: Setting chains to policy $policy: "
|
|
ret=0
|
|
for i in $NF_TABLES; do
|
|
echo -n "$i "
|
|
case "$i" in
|
|
raw)
|
|
$IPTABLES -t raw -P PREROUTING $policy \
|
|
&& $IPTABLES -t raw -P OUTPUT $policy \
|
|
|| let ret+=1
|
|
;;
|
|
filter)
|
|
$IPTABLES -t filter -P INPUT $policy \
|
|
&& $IPTABLES -t filter -P OUTPUT $policy \
|
|
&& $IPTABLES -t filter -P FORWARD $policy \
|
|
|| let ret+=1
|
|
;;
|
|
nat)
|
|
$IPTABLES -t nat -P PREROUTING $policy \
|
|
&& $IPTABLES -t nat -P POSTROUTING $policy \
|
|
&& $IPTABLES -t nat -P OUTPUT $policy \
|
|
|| let ret+=1
|
|
;;
|
|
mangle)
|
|
$IPTABLES -t mangle -P PREROUTING $policy \
|
|
&& $IPTABLES -t mangle -P POSTROUTING $policy \
|
|
&& $IPTABLES -t mangle -P INPUT $policy \
|
|
&& $IPTABLES -t mangle -P OUTPUT $policy \
|
|
&& $IPTABLES -t mangle -P FORWARD $policy \
|
|
|| let ret+=1
|
|
;;
|
|
*)
|
|
let ret+=1
|
|
;;
|
|
esac
|
|
done
|
|
|
|
[ $ret -eq 0 ] && success || failure
|
|
echo
|
|
return $ret
|
|
}
|
|
|
|
load_sysctl() {
|
|
# load matched sysctl values
|
|
if [ -n "$IPTABLES_SYSCTL_LOAD_LIST" ]; then
|
|
echo -n $"Loading sysctl settings: "
|
|
ret=0
|
|
for item in $IPTABLES_SYSCTL_LOAD_LIST; do
|
|
fgrep -hs $item /etc/sysctl.d/*.conf | sysctl -p - >/dev/null
|
|
let ret+=$?;
|
|
done
|
|
[ $ret -eq 0 ] && success || failure
|
|
echo
|
|
fi
|
|
return $ret
|
|
}
|
|
|
|
start() {
|
|
# Do not start if there is no config file.
|
|
if [ ! -f "$IPTABLES_DATA" ]; then
|
|
echo -n $"${IPTABLES}: No config file."; warning; echo
|
|
return 6
|
|
fi
|
|
|
|
# check if ipv6 module load is deactivated
|
|
if [ "${_IPV}" = "ipv6" ] \
|
|
&& grep -qIsE "^install[[:space:]]+${_IPV}[[:space:]]+/bin/(true|false)" /etc/modprobe.conf /etc/modprobe.d/* ; then
|
|
echo $"${IPTABLES}: ${_IPV} is disabled."
|
|
return 150
|
|
fi
|
|
|
|
echo -n $"${IPTABLES}: Applying firewall rules: "
|
|
|
|
OPT=
|
|
[ "x$IPTABLES_SAVE_COUNTER" = "xyes" ] && OPT="-c"
|
|
if [ $IPTABLES_RESTORE_WAIT -ne 0 ]; then
|
|
OPT="${OPT} --wait ${IPTABLES_RESTORE_WAIT}"
|
|
if [ $IPTABLES_RESTORE_WAIT_INTERVAL -lt 1000000 ]; then
|
|
OPT="${OPT} --wait-interval ${IPTABLES_RESTORE_WAIT_INTERVAL}"
|
|
fi
|
|
fi
|
|
|
|
$IPTABLES-restore $OPT $IPTABLES_DATA
|
|
if [ $? -eq 0 ]; then
|
|
success; echo
|
|
else
|
|
failure; echo;
|
|
if [ -f "$IPTABLES_FALLBACK_DATA" ]; then
|
|
echo -n $"${IPTABLES}: Applying firewall fallback rules: "
|
|
$IPTABLES-restore $OPT $IPTABLES_FALLBACK_DATA
|
|
if [ $? -eq 0 ]; then
|
|
success; echo
|
|
else
|
|
failure; echo; return 1
|
|
fi
|
|
else
|
|
return 1
|
|
fi
|
|
fi
|
|
|
|
# Load additional modules (helpers)
|
|
if [ -n "$IPTABLES_MODULES" ]; then
|
|
echo -n $"${IPTABLES}: Loading additional modules: "
|
|
ret=0
|
|
for mod in $IPTABLES_MODULES; do
|
|
echo -n "$mod "
|
|
modprobe $mod > /dev/null 2>&1
|
|
let ret+=$?;
|
|
done
|
|
[ $ret -eq 0 ] && success || failure
|
|
echo
|
|
fi
|
|
|
|
# Load sysctl settings
|
|
load_sysctl
|
|
|
|
touch $VAR_SUBSYS_IPTABLES
|
|
return $ret
|
|
}
|
|
|
|
stop() {
|
|
# Set default chain policy to ACCEPT, in order to not break shutdown
|
|
# on systems where the default policy is DROP and root device is
|
|
# network-based (i.e.: iSCSI, NFS)
|
|
set_policy ACCEPT
|
|
# And then, flush the rules and delete chains
|
|
flush_n_delete
|
|
|
|
rm -f $VAR_SUBSYS_IPTABLES
|
|
return $ret
|
|
}
|
|
|
|
save() {
|
|
echo -n $"${IPTABLES}: Saving firewall rules to $IPTABLES_DATA: "
|
|
|
|
OPT=
|
|
[ "x$IPTABLES_SAVE_COUNTER" = "xyes" ] && OPT="-c"
|
|
|
|
ret=0
|
|
TMP_FILE=$(/bin/mktemp -q $IPTABLES_DATA.XXXXXX) \
|
|
&& chmod 600 "$TMP_FILE" \
|
|
&& $IPTABLES-save $OPT > $TMP_FILE 2>/dev/null \
|
|
&& size=$(stat -c '%s' $TMP_FILE) && [ $size -gt 0 ] \
|
|
|| ret=1
|
|
if [ $ret -eq 0 ]; then
|
|
if [ -e $IPTABLES_DATA ]; then
|
|
cp -f $IPTABLES_DATA $IPTABLES_DATA.save \
|
|
&& chmod 600 $IPTABLES_DATA.save \
|
|
&& restorecon $IPTABLES_DATA.save \
|
|
|| ret=1
|
|
fi
|
|
if [ $ret -eq 0 ]; then
|
|
mv -f $TMP_FILE $IPTABLES_DATA \
|
|
&& chmod 600 $IPTABLES_DATA \
|
|
&& restorecon $IPTABLES_DATA \
|
|
|| ret=1
|
|
fi
|
|
fi
|
|
rm -f $TMP_FILE
|
|
[ $ret -eq 0 ] && success || failure
|
|
echo
|
|
return $ret
|
|
}
|
|
|
|
status() {
|
|
if [ ! -f "$VAR_SUBSYS_IPTABLES" ]; then
|
|
echo $"${IPTABLES}: Firewall is not running."
|
|
return 3
|
|
fi
|
|
|
|
NUM=
|
|
[ "x$IPTABLES_STATUS_NUMERIC" = "xyes" ] && NUM="-n"
|
|
VERBOSE=
|
|
[ "x$IPTABLES_STATUS_VERBOSE" = "xyes" ] && VERBOSE="--verbose"
|
|
COUNT=
|
|
[ "x$IPTABLES_STATUS_LINENUMBERS" = "xyes" ] && COUNT="--line-numbers"
|
|
|
|
for table in $NF_TABLES; do
|
|
echo $"Table: $table"
|
|
$IPTABLES -t $table --list $NUM $VERBOSE $COUNT && echo
|
|
done
|
|
|
|
return 0
|
|
}
|
|
|
|
reload() {
|
|
# Do not reload if there is no config file.
|
|
if [ ! -f "$IPTABLES_DATA" ]; then
|
|
echo -n $"${IPTABLES}: No config file."; warning; echo
|
|
return 6
|
|
fi
|
|
|
|
# check if ipv6 module load is deactivated
|
|
if [ "${_IPV}" = "ipv6" ] \
|
|
&& grep -qIsE "^install[[:space:]]+${_IPV}[[:space:]]+/bin/(true|false)" /etc/modprobe.conf /etc/modprobe.d/* ; then
|
|
echo $"${IPTABLES}: ${_IPV} is disabled."
|
|
return 150
|
|
fi
|
|
|
|
echo -n $"${IPTABLES}: Trying to reload firewall rules: "
|
|
|
|
OPT=
|
|
[ "x$IPTABLES_SAVE_COUNTER" = "xyes" ] && OPT="-c"
|
|
if [ $IPTABLES_RESTORE_WAIT -ne 0 ]; then
|
|
OPT="${OPT} --wait ${IPTABLES_RESTORE_WAIT}"
|
|
if [ $IPTABLES_RESTORE_WAIT_INTERVAL -lt 1000000 ]; then
|
|
OPT="${OPT} --wait-interval ${IPTABLES_RESTORE_WAIT_INTERVAL}"
|
|
fi
|
|
fi
|
|
|
|
$IPTABLES-restore $OPT $IPTABLES_DATA
|
|
if [ $? -eq 0 ]; then
|
|
success; echo
|
|
else
|
|
failure; echo; echo "Firewall rules are not changed."; return 1
|
|
fi
|
|
|
|
# Load additional modules (helpers)
|
|
if [ -n "$IPTABLES_MODULES" ]; then
|
|
echo -n $"${IPTABLES}: Loading additional modules: "
|
|
ret=0
|
|
for mod in $IPTABLES_MODULES; do
|
|
echo -n "$mod "
|
|
modprobe $mod > /dev/null 2>&1
|
|
let ret+=$?;
|
|
done
|
|
[ $ret -eq 0 ] && success || failure
|
|
echo
|
|
fi
|
|
|
|
# Load sysctl settings
|
|
load_sysctl
|
|
|
|
return $ret
|
|
}
|
|
|
|
restart() {
|
|
[ "x$IPTABLES_SAVE_ON_RESTART" = "xyes" ] && save
|
|
stop
|
|
start
|
|
}
|
|
|
|
|
|
case "$1" in
|
|
start)
|
|
[ -f "$VAR_SUBSYS_IPTABLES" ] && exit 0
|
|
start
|
|
RETVAL=$?
|
|
;;
|
|
stop)
|
|
[ "x$IPTABLES_SAVE_ON_STOP" = "xyes" ] && save
|
|
stop
|
|
RETVAL=$?
|
|
;;
|
|
restart|force-reload)
|
|
restart
|
|
RETVAL=$?
|
|
;;
|
|
reload)
|
|
[ -e "$VAR_SUBSYS_IPTABLES" ] && reload
|
|
RETVAL=$?
|
|
;;
|
|
condrestart|try-restart)
|
|
[ ! -e "$VAR_SUBSYS_IPTABLES" ] && exit 0
|
|
restart
|
|
RETVAL=$?
|
|
;;
|
|
status)
|
|
status
|
|
RETVAL=$?
|
|
;;
|
|
panic)
|
|
set_policy DROP
|
|
RETVAL=$?
|
|
;;
|
|
save)
|
|
save
|
|
RETVAL=$?
|
|
;;
|
|
*)
|
|
echo $"Usage: ${IPTABLES} {start|stop|reload|restart|condrestart|status|panic|save}"
|
|
RETVAL=2
|
|
;;
|
|
esac
|
|
|
|
exit $RETVAL
|