iptables管理脚本

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2018-05-09 / 0 评论 / 1,558 阅读 / 正在检测是否收录...
#!/bin/sh
#
# iptablesStart 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
[ "$IPV" = "ip" ] && _IPV="ipv4" || _IPV="ipv6"
PROC_IPTABLES_NAMES=/proc/net/${IPV}_tables_names
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/$IPTABLES does not exist."; warning; echo
    exit 5
fi
# Old or new modutils
/sbin/modprobe --version 2>&1 | grep -q module-init-tools \
    && NEW_MODUTILS=1 \
    || NEW_MODUTILS=0
# Default firewall configuration:
IPTABLES_MODULES=""
IPTABLES_MODULES_UNLOAD="yes"
IPTABLES_SAVE_ON_STOP="no"
IPTABLES_SAVE_ON_RESTART="no"
IPTABLES_SAVE_COUNTER="no"
IPTABLES_STATUS_NUMERIC="yes"
IPTABLES_STATUS_VERBOSE="no"
IPTABLES_STATUS_LINENUMBERS="yes"
IPTABLES_SYSCTL_LOAD_LIST=""
# Load firewall configuration.
[ -f "$IPTABLES_CONFIG" ] && . "$IPTABLES_CONFIG"
# Netfilter modules
NF_MODULES=($(lsmod | awk "/^${IPV}table_/ {print \$1}") ${IPV}_tables)
NF_MODULES_COMMON=(x_tables nf_nat nf_conntrack) # Used by netfilter v4 and v6
# Get active tables
NF_TABLES=$(cat "$PROC_IPTABLES_NAMES" 2>/dev/null)
rmmod_r() {
    # Unload module with all referring modules.
    # At first all referring modules will be unloaded, then the module itself.
    local mod=$1
    local ret=0
    local ref=
    # Get referring modules.
    # New modutils have another output format.
    [ $NEW_MODUTILS = 1 ] \
&& ref=$(lsmod | awk "/^${mod}/ { print \$4; }" | tr ',' ' ') \
|| ref=$(lsmod | grep ^${mod} | cut -d "[" -s -f 2 | cut -d "]" -s -f 1)
    # recursive call for all referring modules
    for i in $ref; do
rmmod_r $i
let ret+=$?;
    done
    # Unload module.
    # The extra test is for 2.6: The module might have autocleaned,
    # after all referring modules are unloaded.
    if grep -q "^${mod}" /proc/modules ; then
modprobe -r $mod > /dev/null 2>&1
res=$?
[ $res -eq 0 ] || echo -n " $mod"
let ret+=$res;
    fi
    return $ret
}
flush_n_delete() {
    # Flush firewall rules and delete chains.
    [ ! -e "$PROC_IPTABLES_NAMES" ] && return 0
    # Check if firewall is configured (has tables)
    [ -z "$NF_TABLES" ] && return 1
    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=$1
    # Check if iptable module is loaded
    [ ! -e "$PROC_IPTABLES_NAMES" ] && return 0
    # Check if firewall is configured (has tables)
    tables=$(cat "$PROC_IPTABLES_NAMES" 2>/dev/null)
    [ -z "$tables" ] && return 1
    echo -n $"${IPTABLES}: Setting chains to policy $policy: "
    ret=0
    for i in $tables; do
echo -n "$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 $item /etc/sysctl.conf | sysctl -p - >/dev/null
            let ret+=$?;
        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"
    $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 $ret
}
stop() {
    # Do not stop if iptables module is not loaded.
    [ ! -e "$PROC_IPTABLES_NAMES" ] && return 0
    # 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
    
    if [ "x$IPTABLES_MODULES_UNLOAD" = "xyes" ]; then
echo -n $"${IPTABLES}: Unloading modules: "
ret=0
for mod in ${NF_MODULES[*]}; do
    rmmod_r $mod
    let ret+=$?;
done
# try to unload remaining netfilter modules used by ipv4 and ipv6 
# netfilter
for mod in ${NF_MODULES_COMMON[*]}; do
    rmmod_r $mod >/dev/null
done
[ $ret -eq 0 ] && success || failure
echo
    fi
    
    rm -f $VAR_SUBSYS_IPTABLES
    return $ret
}
save() {
    # Check if iptable module is loaded
    if [ ! -e "$PROC_IPTABLES_NAMES" ]; then
echo -n $"${IPTABLES}: Nothing to save."; warning; echo
return 0
    fi
    # Check if firewall is configured (has tables)
    if [ -z "$NF_TABLES" ]; then
echo -n $"${IPTABLES}: Nothing to save."; warning; echo
return 6
    fi
    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" -a -z "$NF_TABLES" ]; then
echo $"${IPTABLES}: Firewall is not running."
return 3
    fi
    # Do not print status if lockfile is missing and iptables modules are not 
    # loaded.
    # Check if iptable modules are loaded
    if [ ! -e "$PROC_IPTABLES_NAMES" ]; then
echo $"${IPTABLES}: Firewall modules are not loaded."
return 3
    fi
    # Check if firewall is configured (has tables)
    if [ -z "$NF_TABLES" ]; then
echo $"${IPTABLES}: Firewall is not configured. "
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"
    $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
0

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