#!/bin/bash
#
sed -i '79s/GSSAPIAuthentication yes/GSSAPIAuthentication no/g' /etc/ssh/sshd_config
sed -i '115s/#UseDNS yes/UseDNS no/g' /etc/ssh/sshd_config
systemctl restart sshd
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
setenforce 0
touch /etc/security/limits.d/limits.conf
cat >>/etc/security/limits.d/limits.conf<<EOF
* soft nproc 65535
* hard nproc 65535
* soft nofile 65535
* hard nofile 65535
EOF
cat >>/etc/sysctl.conf <<EOF
fs.file-max = 65535
net.ipv4.ip_forward = 1
vm.swappiness = 0
EOF
sysctl -p
systemctl disable firewalld
systemctl stop firewalld
yum install epel-release
yum repolist
yum install -y nload iftop vim sysstat iostat nmon nmap lrzsz tumx htop psmisc net-tools.x86_64 wget zip unzip sysstat iotop dstat gcc lsof
yum install -y iptables-services
systemctl enable iptables
systemctl start iptables
touch /etc/init.d/iptables
chmod 775 /etc/init.d/iptables
cat >>/etc/init.d/iptables <<EOF
#!/bin/sh
#
# 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
[ "$IPV" = "ip" ] && _IPV="ipv4" || _IPV="ipv6"
PROC_IPTABLES_NAMES=/proc/net/${IPV}_tables_names
VAR_SUBSYS_IPTABLES=/var/lock/subsys/$IPTABLES
# only usable for root
[ $EUID = 0 ] || exit 4
if [ ! -x /sbin/$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 $ret
}
start() {
# Do not start if there is no config file.
[ ! -f "$IPTABLES_DATA" ] && return 6
# 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 $ret
}
save() {
# Check if iptable module is loaded
[ ! -e "$PROC_IPTABLES_NAMES" ] && return 0
# Check if firewall is configured (has tables)
[ -z "$NF_TABLES" ] && return 6
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 $COUNT && echo
done
return 0
}
reload() {
# Do not reload if there is no config file.
[ ! -f "$IPTABLES_DATA" ] && return 6
# 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
EOF
/etc/init.d/iptables save
cat >>~/.bashrc <<EOF
alias ll='ls -lh --color=auto'
alias grep='grep --color=auto'
alias vi='vim'
EOF
source ~/.bashrc
source /etc/profile