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Amazon-CIS-Remediation.sh
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Amazon-CIS-Remediation.sh
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#!/bin/bash
PROFILE=${1:-Level 1}
if [ "$PROFILE" = "Level 1" ] || [ "$PROFILE" = "Level 2" ]; then
echo \*\*\*\* Executing Level 1 profile remediation
# Ensure mounting of cramfs filesystems is disabled
echo
echo \*\*\*\* Ensure\ mounting\ of\ cramfs\ filesystems\ is\ disabled
modprobe -n -v cramfs | grep "^install /bin/true$" || echo "install cramfs /bin/true" >> /etc/modprobe.d/CIS.conf
lsmod | egrep "^cramfs\s" && rmmod cramfs
# Ensure mounting of freevxfs filesystems is disabled
echo
echo \*\*\*\* Ensure\ mounting\ of\ freevxfs\ filesystems\ is\ disabled
modprobe -n -v freevxfs | grep "^install /bin/true$" || echo "install freevxfs /bin/true" >> /etc/modprobe.d/CIS.conf
lsmod | egrep "^freevxfs\s" && rmmod freevxfs
# Ensure mounting of jffs2 filesystems is disabled
echo
echo \*\*\*\* Ensure\ mounting\ of\ jffs2\ filesystems\ is\ disabled
modprobe -n -v jffs2 | grep "^install /bin/true$" || echo "install jffs2 /bin/true" >> /etc/modprobe.d/CIS.conf
lsmod | egrep "^jffs2\s" && rmmod jffs2
# Ensure mounting of hfs filesystems is disabled
echo
echo \*\*\*\* Ensure\ mounting\ of\ hfs\ filesystems\ is\ disabled
modprobe -n -v hfs | grep "^install /bin/true$" || echo "install hfs /bin/true" >> /etc/modprobe.d/CIS.conf
lsmod | egrep "^hfs\s" && rmmod hfs
# Ensure mounting of hfsplus filesystems is disabled
echo
echo \*\*\*\* Ensure\ mounting\ of\ hfsplus\ filesystems\ is\ disabled
modprobe -n -v hfsplus | grep "^install /bin/true$" || echo "install hfsplus /bin/true" >> /etc/modprobe.d/CIS.conf
lsmod | egrep "^hfsplus\s" && rmmod hfsplus
# Ensure mounting of squashfs filesystems is disabled
echo
echo \*\*\*\* Ensure\ mounting\ of\ squashfs\ filesystems\ is\ disabled
modprobe -n -v squashfs | grep "^install /bin/true$" || echo "install squashfs /bin/true" >> /etc/modprobe.d/CIS.conf
lsmod | egrep "^squashfs\s" && rmmod squashfs
# Ensure mounting of udf filesystems is disabled
echo
echo \*\*\*\* Ensure\ mounting\ of\ udf\ filesystems\ is\ disabled
modprobe -n -v udf | grep "^install /bin/true$" || echo "install udf /bin/true" >> /etc/modprobe.d/CIS.conf
lsmod | egrep "^udf\s" && rmmod udf
# Ensure mounting of FAT filesystems is disabled
echo
echo \*\*\*\* Ensure\ mounting\ of\ FAT\ filesystems\ is\ disabled
modprobe -n -v vfat | grep "^install /bin/true$" || echo "install vfat /bin/true" >> /etc/modprobe.d/CIS.conf
lsmod | egrep "^vfat\s" && rmmod vfat
# Ensure nodev option set on /tmp partition
echo
echo \*\*\*\* Ensure\ nodev\ option\ set\ on\ /tmp\ partition
echo Ensure\ nodev\ option\ set\ on\ /tmp\ partition not configured
# Ensure nosuid option set on /tmp partition
echo
echo \*\*\*\* Ensure\ nosuid\ option\ set\ on\ /tmp\ partition
echo Ensure\ nosuid\ option\ set\ on\ /tmp\ partition not configured
# Ensure noexec option set on /tmp partition
echo
echo \*\*\*\* Ensure\ noexec\ option\ set\ on\ /tmp\ partition
echo Ensure\ noexec\ option\ set\ on\ /tmp\ partition not configured
# Ensure nodev option set on /var/tmp partition
echo
echo \*\*\*\* Ensure\ nodev\ option\ set\ on\ /var/tmp\ partition
echo Ensure\ nodev\ option\ set\ on\ /var/tmp\ partition not configured
# Ensure nosuid option set on /var/tmp partition
echo
echo \*\*\*\* Ensure\ nosuid\ option\ set\ on\ /var/tmp\ partition
echo Ensure\ nosuid\ option\ set\ on\ /var/tmp\ partition not configured
# Ensure noexec option set on /var/tmp partition
echo
echo \*\*\*\* Ensure\ noexec\ option\ set\ on\ /var/tmp\ partition
echo Ensure\ noexec\ option\ set\ on\ /var/tmp\ partition not configured
# Ensure nodev option set on /home partition
echo
echo \*\*\*\* Ensure\ nodev\ option\ set\ on\ /home\ partition
echo Ensure\ nodev\ option\ set\ on\ /home\ partition not configured
# Ensure nodev option set on /dev/shm partition
echo
echo \*\*\*\* Ensure\ nodev\ option\ set\ on\ /dev/shm\ partition
egrep -q "^(\s*\S+\s+)/dev/shm(\s+\S+\s+\S+)(\s+\S+\s+\S+)(\s*#.*)?\s*$" /etc/fstab && sed -ri "s/^(\s*\S+\s+)\/dev\/shm(\s+\S+\s+\S+)(\s+\S+\s+\S+)(\s*#.*)?\s*$/\1\/dev\/shm\2,nodev\3\4/" /etc/fstab
# Ensure nosuid option set on /dev/shm partition
echo
echo \*\*\*\* Ensure\ nosuid\ option\ set\ on\ /dev/shm\ partition
egrep -q "^(\s*\S+\s+)/dev/shm(\s+\S+\s+\S+)(\s+\S+\s+\S+)(\s*#.*)?\s*$" /etc/fstab && sed -ri "s/^(\s*\S+\s+)\/dev\/shm(\s+\S+\s+\S+)(\s+\S+\s+\S+)(\s*#.*)?\s*$/\1\/dev\/shm\2,nosuid\3\4/" /etc/fstab
# Ensure noexec option set on /dev/shm partition
echo
echo \*\*\*\* Ensure\ noexec\ option\ set\ on\ /dev/shm\ partition
egrep -q "^(\s*\S+\s+)/dev/shm(\s+\S+\s+\S+)(\s+\S+\s+\S+)(\s*#.*)?\s*$" /etc/fstab && sed -ri "s/^(\s*\S+\s+)\/dev\/shm(\s+\S+\s+\S+)(\s+\S+\s+\S+)(\s*#.*)?\s*$/\1\/dev\/shm\2,noexec\3\4/" /etc/fstab || echo "tmpfs /dev/shm tmpfs defaults,nodev,nosuid,noexec 0 0" >> /etc/fstab
mount -o remount,noexec,nosuid,nodev /dev/shm
# Ensure sticky bit is set on all world-writable directories
echo
echo \*\*\*\* Ensure\ sticky\ bit\ is\ set\ on\ all\ world-writable\ directories
df --local -P | awk {'if (NR!=1) print $6'} | xargs -I '{}' find '{}' -xdev -type d \( -perm -0002 -a ! -perm -1000 \) 2>/dev/null | xargs chmod a+t
# Disable Automounting
echo
echo \*\*\*\* Disable\ Automounting
chkconfig autofs off
# Ensure gpgcheck is globally activated
echo
echo \*\*\*\* Ensure\ gpgcheck\ is\ globally\ activated
egrep -q "^(\s*)gpgcheck\s*=\s*\S+(\s*#.*)?\s*$" /etc/yum.conf && sed -ri "s/^(\s*)gpgcheck\s*=\s*\S+(\s*#.*)?\s*$/\1gpgcheck=1\2/" /etc/yum.conf || echo "gpgcheck=1" >> /etc/yum.conf
for file in /etc/yum.repos.d/*; do
egrep -q "^(\s*)gpgcheck\s*=\s*\S+(\s*#.*)?\s*$" $file && sed -ri "s/^(\s*)gpgcheck\s*=\s*\S+(\s*#.*)?\s*$/\1gpgcheck=1\2/" $file || echo "gpgcheck=1" >> $file
done
# Ensure AIDE is installed
echo
echo \*\*\*\* Ensure\ AIDE\ is\ installed
rpm -q aide || yum -y install aide
# Ensure filesystem integrity is regularly checked
echo
echo \*\*\*\* Ensure\ filesystem\ integrity\ is\ regularly\ checked
(crontab -u root -l; crontab -u root -l | egrep -q "^0 5 \* \* \* /usr/sbin/aide --check$" || echo "0 5 * * * /usr/sbin/aide --check" ) | crontab -u root -
# Ensure permissions on bootloader config are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ bootloader\ config\ are\ configured
chmod g-r-w-x,o-r-w-x /boot/grub/grub.conf
# Ensure authentication required for single user mode
echo
echo \*\*\*\* Ensure\ authentication\ required\ for\ single\ user\ mode
egrep -q "^[[:space:]]*SINGLE" /etc/sysconfig/init && sed -ri "s/(^[[:space:]]*SINGLE[[:space:]]*=[[:space:]]*).*$/\1\/sbin\/sulogin/" /etc/sysconfig/init || echo "SINGLE=/sbin/sulogin" >> /etc/sysconfig/init
# Ensure interactive boot is not enabled
echo
echo \*\*\*\* Ensure\ interactive\ boot\ is\ not\ enabled
egrep -q "^[[:space:]]*PROMPT" /etc/sysconfig/init && sed -ri "s/(^[[:space:]]*PROMPT[[:space:]]*=[[:space:]]*).*$/\1no/" /etc/sysconfig/init || echo "PROMPT=no" >> /etc/sysconfig/init
# Ensure core dumps are restricted
echo
echo \*\*\*\* Ensure\ core\ dumps\ are\ restricted
egrep -q "^(\s*)\*\s+hard\s+core\s+\S+(\s*#.*)?\s*$" /etc/security/limits.conf && sed -ri "s/^(\s*)\*\s+hard\s+core\s+\S+(\s*#.*)?\s*$/\1* hard core 0\2/" /etc/security/limits.conf || echo "* hard core 0" >> /etc/security/limits.conf
echo Ensure\ core\ dumps\ are\ restricted not configured.
egrep -q "^(\s*)fs.suid_dumpable\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)fs.suid_dumpable\s*=\s*\S+(\s*#.*)?\s*$/\1fs.suid_dumpable = 0\2/" /etc/sysctl.conf || echo "fs.suid_dumpable = 0" >> /etc/sysctl.conf
# Ensure XD/NX support is enabled
echo
echo \*\*\*\* Ensure\ XD/NX\ support\ is\ enabled
echo Ensure\ XD/NX\ support\ is\ enabled not configured.
# Ensure address space layout randomization (ASLR) is enabled
echo
echo \*\*\*\* Ensure\ address\ space\ layout\ randomization\ \(ASLR\)\ is\ enabled
egrep -q "^(\s*)kernel.randomize_va_space\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)kernel.randomize_va_space\s*=\s*\S+(\s*#.*)?\s*$/\1kernel.randomize_va_space = 2\2/" /etc/sysctl.conf || echo "kernel.randomize_va_space = 2" >> /etc/sysctl.conf
# Ensure prelink is disabled
echo
echo \*\*\*\* Ensure\ prelink\ is\ disabled
rpm -q prelink && yum -y remove prelink
# Ensure message of the day is configured properly
echo
echo \*\*\*\* Ensure\ message\ of\ the\ day\ is\ configured\ properly
sed -ri 's/(\\v|\\r|\\m|\\s)//g' /etc/motd
# Ensure local login warning banner is configured properly
echo
echo \*\*\*\* Ensure\ local\ login\ warning\ banner\ is\ configured\ properly
echo "Authorized uses only. All activity may be monitored and reported." > /etc/issue
# Ensure remote login warning banner is configured properly
echo
echo \*\*\*\* Ensure\ remote\ login\ warning\ banner\ is\ configured\ properly
echo "Authorized uses only. All activity may be monitored and reported." > /etc/issue.net
# Ensure permissions on /etc/motd are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/motd\ are\ configured
chmod -t,u+r+w-x-s,g+r-w-x-s,o+r-w-x /etc/motd
# Ensure permissions on /etc/issue are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/issue\ are\ configured
chmod -t,u+r+w-x-s,g+r-w-x-s,o+r-w-x /etc/issue
# Ensure permissions on /etc/issue.net are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/issue.net\ are\ configured
chmod -t,u+r+w-x-s,g+r-w-x-s,o+r-w-x /etc/issue.net
# Ensure chargen services are not enabled
echo
echo \*\*\*\* Ensure\ chargen\ services\ are\ not\ enabled
chkconfig chargen off
echo /etc/inetd.conf and /etc/inetd.d/* unmodified
# Ensure daytime services are not enabled
echo
echo \*\*\*\* Ensure\ daytime\ services\ are\ not\ enabled
chkconfig daytime off
echo /etc/inetd.conf and /etc/inetd.d/* unmodified
# Ensure discard services are not enabled
echo
echo \*\*\*\* Ensure\ discard\ services\ are\ not\ enabled
chkconfig discard off
echo /etc/inetd.conf and /etc/inetd.d/* unmodified
# Ensure echo services are not enabled
echo
echo \*\*\*\* Ensure\ echo\ services\ are\ not\ enabled
chkconfig echo off
echo /etc/inetd.conf and /etc/inetd.d/* unmodified
# Ensure time services are not enabled
echo
echo \*\*\*\* Ensure\ time\ services\ are\ not\ enabled
chkconfig time off
echo /etc/inetd.conf and /etc/inetd.d/* unmodified
# Ensure rsh server is not enabled
echo
echo \*\*\*\* Ensure\ rsh\ server\ is\ not\ enabled
chkconfig rsh off
echo /etc/inetd.conf and /etc/inetd.d/* unmodified
chkconfig rlogin off
echo /etc/inetd.conf and /etc/inetd.d/* unmodified
chkconfig resec off
echo /etc/inetd.conf and /etc/inetd.d/* unmodified
# Ensure talk server is not enabled
echo
echo \*\*\*\* Ensure\ talk\ server\ is\ not\ enabled
chkconfig talk off
echo /etc/inetd.conf and /etc/inetd.d/* unmodified
# Ensure telnet server is not enabled
echo
echo \*\*\*\* Ensure\ telnet\ server\ is\ not\ enabled
chkconfig telnet off
echo /etc/inetd.conf and /etc/inetd.d/* unmodified
# Ensure tftp server is not enabled
echo
echo \*\*\*\* Ensure\ tftp\ server\ is\ not\ enabled
chkconfig tftp off
echo /etc/inetd.conf and /etc/inetd.d/* unmodified
# Ensure rsync service is not enabled
echo
echo \*\*\*\* Ensure\ rsync\ service\ is\ not\ enabled
chkconfig rsync off
echo /etc/inetd.conf and /etc/inetd.d/* unmodified
# Ensure xinetd is not enabled
echo
echo \*\*\*\* Ensure\ xinetd\ is\ not\ enabled
chkconfig xinetd off
# Ensure time synchronization is in use
echo
echo \*\*\*\* Ensure\ time\ synchronization\ is\ in\ use
rpm -q ntp || rpm -q chrony || yum -y install ntp
# Ensure ntp is configured
echo
echo \*\*\*\* Ensure\ ntp\ is\ configured
if rpm -q ntp >/dev/null; then
egrep -q "^\s*restrict(\s+-4)?\s+default(\s+\S+)*(\s*#.*)?\s*$" /etc/ntp.conf && sed -ri "s/^(\s*)restrict(\s+-4)?\s+default(\s+[^[:space:]#]+)*(\s+#.*)?\s*$/\1restrict\2 default kod nomodify notrap nopeer noquery\4/" /etc/ntp.conf || echo "restrict default kod nomodify notrap nopeer noquery" >> /etc/ntp.conf
egrep -q "^\s*restrict\s+-6\s+default(\s+\S+)*(\s*#.*)?\s*$" /etc/ntp.conf && sed -ri "s/^(\s*)restrict\s+-6\s+default(\s+[^[:space:]#]+)*(\s+#.*)?\s*$/\1restrict -6 default kod nomodify notrap nopeer noquery\3/" /etc/ntp.conf || echo "restrict -6 default kod nomodify notrap nopeer noquery" >> /etc/ntp.conf
egrep -q "^(\s*)OPTIONS\s*=\s*\"(([^\"]+)?-u\s[^[:space:]\"]+([^\"]+)?|([^\"]+))\"(\s*#.*)?\s*$" /etc/sysconfig/ntpd && sed -ri '/^(\s*)OPTIONS\s*=\s*\"([^\"]*)\"(\s*#.*)?\s*$/ {/^(\s*)OPTIONS\s*=\s*\"[^\"]*-u\s+\S+[^\"]*\"(\s*#.*)?\s*$/! s/^(\s*)OPTIONS\s*=\s*\"([^\"]*)\"(\s*#.*)?\s*$/\1OPTIONS=\"\2 -u ntp:ntp\"\3/ }' /etc/sysconfig/ntpd && sed -ri "s/^(\s*)OPTIONS\s*=\s*\"([^\"]+\s+)?-u\s[^[:space:]\"]+(\s+[^\"]+)?\"(\s*#.*)?\s*$/\1OPTIONS=\"\2\-u ntp:ntp\3\"\4/" /etc/sysconfig/ntpd || echo "OPTIONS=\"-u ntp:ntp\"" >> /etc/sysconfig/ntpd
echo Ensure ntp is configured - server not configured.
fi
# Ensure chrony is configured
echo
echo \*\*\*\* Ensure\ chrony\ is\ configured
if rpm -q chrony >/dev/null; then
egrep -q "^(\s*)OPTIONS\s*=\s*\"(([^\"]+)?-u\s[^[:space:]\"]+([^\"]+)?|([^\"]+))\"(\s*#.*)?\s*$" /etc/sysconfig/chronyd && sed -ri '/^(\s*)OPTIONS\s*=\s*\"([^\"]*)\"(\s*#.*)?\s*$/ {/^(\s*)OPTIONS\s*=\s*\"[^\"]*-u\s+\S+[^\"]*\"(\s*#.*)?\s*$/! s/^(\s*)OPTIONS\s*=\s*\"([^\"]*)\"(\s*#.*)?\s*$/\1OPTIONS=\"\2 -u chrony\"\3/ }' /etc/sysconfig/chronyd && sed -ri "s/^(\s*)OPTIONS\s*=\s*\"([^\"]+\s+)?-u\s[^[:space:]\"]+(\s+[^\"]+)?\"(\s*#.*)?\s*$/\1OPTIONS=\"\2\-u chrony\3\"\4/" /etc/sysconfig/chronyd || echo "OPTIONS=\"-u chrony\"" >> /etc/sysconfig/chronyd
echo Ensure chrony is configured - server not configured.
fi
# Ensure X Window System is not installed
echo
echo \*\*\*\* Ensure\ X\ Window\ System\ is\ not\ installed
yum -y remove xorg-x11*
# Ensure Avahi Server is not enabled
echo
echo \*\*\*\* Ensure\ Avahi\ Server\ is\ not\ enabled
chkconfig avahi-daemon off
# Ensure CUPS is not enabled
echo
echo \*\*\*\* Ensure\ CUPS\ is\ not\ enabled
chkconfig cups off
# Ensure DHCP Server is not enabled
echo
echo \*\*\*\* Ensure\ DHCP\ Server\ is\ not\ enabled
chkconfig dhcpd off
# Ensure LDAP server is not enabled
echo
echo \*\*\*\* Ensure\ LDAP\ server\ is\ not\ enabled
chkconfig slapd off
# Ensure NFS and RPC are not enabled
echo
echo \*\*\*\* Ensure\ NFS\ and\ RPC\ are\ not\ enabled
chkconfig nfs off
service nfs stop
chkconfig rpcbind off
service rpcbind stop
# Ensure DNS Server is not enabled
echo
echo \*\*\*\* Ensure\ DNS\ Server\ is\ not\ enabled
chkconfig named off
# Ensure FTP Server is not enabled
echo
echo \*\*\*\* Ensure\ FTP\ Server\ is\ not\ enabled
chkconfig vsftpd off
# Ensure HTTP server is not enabled
echo
echo \*\*\*\* Ensure\ HTTP\ server\ is\ not\ enabled
chkconfig htttpd off
# Ensure IMAP and POP3 server is not enabled
echo
echo \*\*\*\* Ensure\ IMAP\ and\ POP3\ server\ is\ not\ enabled
chkconfig dovecot off
# Ensure Samba is not enabled
echo
echo \*\*\*\* Ensure\ Samba\ is\ not\ enabled
chkconfig smb off
# Ensure HTTP Proxy Server is not enabled
echo
echo \*\*\*\* Ensure\ HTTP\ Proxy\ Server\ is\ not\ enabled
chkconfig squid off
# Ensure SNMP Server is not enabled
echo
echo \*\*\*\* Ensure\ SNMP\ Server\ is\ not\ enabled
chkconfig snmpd off
# Ensure mail transfer agent is configured for local-only mode
echo
echo \*\*\*\* Ensure\ mail\ transfer\ agent\ is\ configured\ for\ local-only\ mode
echo Ensure\ mail\ transfer\ agent\ is\ configured\ for\ local-only\ mode Linux custom object not configured.
# Ensure NIS Server is not enabled
echo
echo \*\*\*\* Ensure\ NIS\ Server\ is\ not\ enabled
chkconfig ypserv off
# Ensure NIS Client is not installed
echo
echo \*\*\*\* Ensure\ NIS\ Client\ is\ not\ installed
rpm -q ypbind && yum -y remove ypbind
# Ensure rsh client is not installed
echo
echo \*\*\*\* Ensure\ rsh\ client\ is\ not\ installed
rpm -q rsh && yum -y remove rsh
# Ensure talk client is not installed
echo
echo \*\*\*\* Ensure\ talk\ client\ is\ not\ installed
rpm -q talk && yum -y remove talk
# Ensure telnet client is not installed
echo
echo \*\*\*\* Ensure\ telnet\ client\ is\ not\ installed
rpm -q telnet && yum -y remove telnet
# Ensure LDAP client is not installed
echo
echo \*\*\*\* Ensure\ LDAP\ client\ is\ not\ installed
rpm -q openldap-clients && yum -y remove openldap-clients
# Ensure IP forwarding is disabled
echo
echo \*\*\*\* Ensure\ IP\ forwarding\ is\ disabled
egrep -q "^(\s*)net.ipv4.ip_forward\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv4.ip_forward\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv4.ip_forward = 0\2/" /etc/sysctl.conf || echo "net.ipv4.ip_forward = 0" >> /etc/sysctl.conf
# Ensure packet redirect sending is disabled
echo
echo \*\*\*\* Ensure\ packet\ redirect\ sending\ is\ disabled
egrep -q "^(\s*)net.ipv4.conf.all.send_redirects\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv4.conf.all.send_redirects\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv4.conf.all.send_redirects = 0\2/" /etc/sysctl.conf || echo "net.ipv4.conf.all.send_redirects = 0" >> /etc/sysctl.conf
egrep -q "^(\s*)net.ipv4.conf.default.send_redirects\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv4.conf.default.send_redirects\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv4.conf.default.send_redirects = 0\2/" /etc/sysctl.conf || echo "net.ipv4.conf.default.send_redirects = 0" >> /etc/sysctl.conf
# Ensure source routed packets are not accepted
echo
echo \*\*\*\* Ensure\ source\ routed\ packets\ are\ not\ accepted
egrep -q "^(\s*)net.ipv4.conf.all.accept_source_route\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv4.conf.all.accept_source_route\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv4.conf.all.accept_source_route = 0\2/" /etc/sysctl.conf || echo "net.ipv4.conf.all.accept_source_route = 0" >> /etc/sysctl.conf
egrep -q "^(\s*)net.ipv4.conf.default.accept_source_route\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv4.conf.default.accept_source_route\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv4.conf.default.accept_source_route = 0\2/" /etc/sysctl.conf || echo "net.ipv4.conf.default.accept_source_route = 0" >> /etc/sysctl.conf
# Ensure ICMP redirects are not accepted
echo
echo \*\*\*\* Ensure\ ICMP\ redirects\ are\ not\ accepted
egrep -q "^(\s*)net.ipv4.conf.all.accept_redirects\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv4.conf.all.accept_redirects\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv4.conf.all.accept_redirects = 0\2/" /etc/sysctl.conf || echo "net.ipv4.conf.all.accept_redirects = 0" >> /etc/sysctl.conf
egrep -q "^(\s*)net.ipv4.conf.default.accept_redirects\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv4.conf.default.accept_redirects\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv4.conf.default.accept_redirects = 0\2/" /etc/sysctl.conf || echo "net.ipv4.conf.default.accept_redirects = 0" >> /etc/sysctl.conf
# Ensure secure ICMP redirects are not accepted
echo
echo \*\*\*\* Ensure\ secure\ ICMP\ redirects\ are\ not\ accepted
egrep -q "^(\s*)net.ipv4.conf.all.secure_redirects\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv4.conf.all.secure_redirects\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv4.conf.all.secure_redirects = 0\2/" /etc/sysctl.conf || echo "net.ipv4.conf.all.secure_redirects = 0" >> /etc/sysctl.conf
egrep -q "^(\s*)net.ipv4.conf.default.secure_redirects\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv4.conf.default.secure_redirects\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv4.conf.default.secure_redirects = 0\2/" /etc/sysctl.conf || echo "net.ipv4.conf.default.secure_redirects = 0" >> /etc/sysctl.conf
# Ensure suspicious packets are logged
echo
echo \*\*\*\* Ensure\ suspicious\ packets\ are\ logged
egrep -q "^(\s*)net.ipv4.conf.all.log_martians\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv4.conf.all.log_martians\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv4.conf.all.log_martians = 1\2/" /etc/sysctl.conf || echo "net.ipv4.conf.all.log_martians = 1" >> /etc/sysctl.conf
egrep -q "^(\s*)net.ipv4.conf.default.log_martians\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv4.conf.default.log_martians\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv4.conf.default.log_martians = 1\2/" /etc/sysctl.conf || echo "net.ipv4.conf.default.log_martians = 1" >> /etc/sysctl.conf
# Ensure broadcast ICMP requests are ignored
echo
echo \*\*\*\* Ensure\ broadcast\ ICMP\ requests\ are\ ignored
egrep -q "^(\s*)net.ipv4.icmp_echo_ignore_broadcasts\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv4.icmp_echo_ignore_broadcasts\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv4.icmp_echo_ignore_broadcasts = 1\2/" /etc/sysctl.conf || echo "net.ipv4.icmp_echo_ignore_broadcasts = 1" >> /etc/sysctl.conf
# Ensure bogus ICMP responses are ignored
echo
echo \*\*\*\* Ensure\ bogus\ ICMP\ responses\ are\ ignored
egrep -q "^(\s*)net.ipv4.icmp_ignore_bogus_error_responses\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv4.icmp_ignore_bogus_error_responses\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv4.icmp_ignore_bogus_error_responses = 1\2/" /etc/sysctl.conf || echo "net.ipv4.icmp_ignore_bogus_error_responses = 1" >> /etc/sysctl.conf
# Ensure Reverse Path Filtering is enabled
echo
echo \*\*\*\* Ensure\ Reverse\ Path\ Filtering\ is\ enabled
egrep -q "^(\s*)net.ipv4.conf.all.rp_filter\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv4.conf.all.rp_filter\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv4.conf.all.rp_filter = 1\2/" /etc/sysctl.conf || echo "net.ipv4.conf.all.rp_filter = 1" >> /etc/sysctl.conf
egrep -q "^(\s*)net.ipv4.conf.default.rp_filter\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv4.conf.default.rp_filter\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv4.conf.default.rp_filter = 1\2/" /etc/sysctl.conf || echo "net.ipv4.conf.default.rp_filter = 1" >> /etc/sysctl.conf
# Ensure TCP SYN Cookies is enabled
echo
echo \*\*\*\* Ensure\ TCP\ SYN\ Cookies\ is\ enabled
egrep -q "^(\s*)net.ipv4.tcp_syncookies\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv4.tcp_syncookies\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv4.tcp_syncookies = 1\2/" /etc/sysctl.conf || echo "net.ipv4.tcp_syncookies = 1" >> /etc/sysctl.conf
# Ensure IPv6 router advertisements are not accepted
echo
echo \*\*\*\* Ensure\ IPv6\ router\ advertisements\ are\ not\ accepted
egrep -q "^(\s*)net.ipv6.conf.all.accept_ra\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv6.conf.all.accept_ra\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv6.conf.all.accept_ra = 0\2/" /etc/sysctl.conf || echo "net.ipv6.conf.all.accept_ra = 0" >> /etc/sysctl.conf
egrep -q "^(\s*)net.ipv6.conf.default.accept_ra\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv6.conf.default.accept_ra\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv6.conf.default.accept_ra = 0\2/" /etc/sysctl.conf || echo "net.ipv6.conf.default.accept_ra = 0" >> /etc/sysctl.conf
# Ensure IPv6 redirects are not accepted
echo
echo \*\*\*\* Ensure\ IPv6\ redirects\ are\ not\ accepted
egrep -q "^(\s*)net.ipv6.conf.all.accept_redirects\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv6.conf.all.accept_redirects\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv6.conf.all.accept_redirects = 0\2/" /etc/sysctl.conf || echo "net.ipv6.conf.all.accept_redirects = 0" >> /etc/sysctl.conf
egrep -q "^(\s*)net.ipv6.conf.default.accept_redirects\s*=\s*\S+(\s*#.*)?\s*$" /etc/sysctl.conf && sed -ri "s/^(\s*)net.ipv6.conf.default.accept_redirects\s*=\s*\S+(\s*#.*)?\s*$/\1net.ipv6.conf.default.accept_redirects = 0\2/" /etc/sysctl.conf || echo "net.ipv6.conf.default.accept_redirects = 0" >> /etc/sysctl.conf
# Now Reloading the Settings from File /etc/sysctl.conf
echo \*\*\*\* Reloading\ the\ Settings\ from\ file\ /etc/sysctl.conf
# Ensure IPv6 is disabled
echo
echo \*\*\*\* Ensure\ IPv6\ is\ disabled
echo Ensure\ IPv6\ is\ disabled not configured.
# Ensure TCP Wrappers is installed
echo
echo \*\*\*\* Ensure\ TCP\ Wrappers\ is\ installed
rpm -q tcp_wrappers || yum -y install tcp_wrappers
rpm -q tcp_wrappers-libs || yum -y install tcp_wrappers-libs
# Ensure /etc/hosts.allow is configured
echo
echo \*\*\*\* Ensure\ /etc/hosts.allow\ is\ configured
touch /etc/hosts.allow
egrep -q "^ALL:\s*ALL" /etc/hosts.allow || echo "sshd: ALL" >> /etc/hosts.allow
# Ensure /etc/hosts.deny is configured
echo
echo \*\*\*\* Ensure\ /etc/hosts.deny\ is\ configured
touch /etc/hosts.deny
egrep -q "^ALL:\s*ALL" /etc/hosts.deny || echo "ALL: ALL" >> /etc/hosts.deny
# Ensure permissions on /etc/hosts.allow are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/hosts.allow\ are\ configured
chmod -t,u+r+w-x-s,g+r-w-x-s,o+r-w-x /etc/hosts.allow
# Ensure permissions on /etc/hosts.deny are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/hosts.deny\ are\ configured
chmod -t,u+r+w-x-s,g+r-w-x-s,o+r-w-x /etc/hosts.deny
# Ensure DCCP is disabled
echo
echo \*\*\*\* Ensure\ DCCP\ is\ disabled
modprobe -n -v dccp | grep "^install /bin/true$" || echo "install dccp /bin/true" >> /etc/modprobe.d/CIS.conf
lsmod | egrep "^dccp\s" && rmmod dccp
# Ensure SCTP is disabled
echo
echo \*\*\*\* Ensure\ SCTP\ is\ disabled
modprobe -n -v sctp | grep "^install /bin/true$" || echo "install sctp /bin/true" >> /etc/modprobe.d/CIS.conf
lsmod | egrep "^sctp\s" && rmmod sctp
# Ensure RDS is disabled
echo
echo \*\*\*\* Ensure\ RDS\ is\ disabled
modprobe -n -v rds | grep "^install /bin/true$" || echo "install rds /bin/true" >> /etc/modprobe.d/CIS.conf
lsmod | egrep "^rds\s" && rmmod rds
# Ensure TIPC is disabled
echo
echo \*\*\*\* Ensure\ TIPC\ is\ disabled
modprobe -n -v tipc | grep "^install /bin/true$" || echo "install tipc /bin/true" >> /etc/modprobe.d/CIS.conf
lsmod | egrep "^tipc\s" && rmmod tipc
# Ensure iptables is installed
echo
echo \*\*\*\* Ensure\ iptables\ is\ installed
rpm -q iptables || yum -y install iptables
# Ensure default deny firewall policy
echo
echo \*\*\*\* Ensure\ default\ deny\ firewall\ policy
# Flush IPtables rules
iptables -F
# Ensure default deny firewall policy
iptables -P INPUT DROP
iptables -P OUTPUT DROP
iptables -P FORWARD DROP
# Ensure loopback traffic is configured CIS-3.6.3
echo
echo \*\*\*\* Ensure\ loopback\ traffic\ is\ configured
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT
iptables -A INPUT -s 127.0.0.0/8 -j DROP
# Ensure outbound and established connections are configured CIS-3.6.4
iptables -A OUTPUT -p tcp -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p udp -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p icmp -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A INPUT -p tcp -m state --state ESTABLISHED -j ACCEPT
iptables -A INPUT -p udp -m state --state ESTABLISHED -j ACCEPT
iptables -A INPUT -p icmp -m state --state ESTABLISHED -j ACCEPT
# Open inbound ssh(tcp port 22) connections CIS-3.6.5
echo
echo \*\*\*\* Ensure\ firewall\ rules\ exist\ for\ all\ open\ ports
iptables -A INPUT -p tcp --dport 22 -m state --state NEW -j ACCEPT
iptables-save > /etc/sysconfig/iptables
echo
# Ensure rsyslog is configured to send logs to a remote log host
echo
echo \*\*\*\* Ensure\ rsyslog\ is\ configured\ to\ send\ logs\ to\ a\ remote\ log\ host
echo Ensure\ rsyslog\ is\ configured\ to\ send\ logs\ to\ a\ remote\ log\ host not configured.
# Ensure syslog-ng service is enabled
echo
echo \*\*\*\* Ensure\ syslog-ng\ service\ is\ enabled
rpm -q syslog-ng && chkconfig syslog-ng on
# Ensure syslog-ng default file permissions configured
echo
echo \*\*\*\* Ensure\ syslog-ng\ default\ file\ permissions\ configured
echo Ensure\ syslog-ng\ default\ file\ permissions\ configured not configured.
# Ensure rsyslog or syslog-ng is installed
echo
echo \*\*\*\* Ensure\ rsyslog\ or\ syslog-ng\ is\ installed
rpm -q rsyslog || rpm -q syslog-ng || yum -y install rsyslog
# Ensure rsyslog Service is enabled
echo
echo \*\*\*\* Ensure\ rsyslog\ Service\ is\ enabled
rpm -q rsyslog && chkconfig rsyslog on
# Ensure rsyslog default file permissions configured
echo
echo \*\*\*\* Ensure\ rsyslog\ default\ file\ permissions\ configured
echo Ensure\ rsyslog\ default\ file\ permissions\ configured not configured.
egrep -q '^(\$)FileCreateMode(\s.*)0[1,5,6][1,4]0$' /etc/rsyslog.conf && sed -ri 's/^\$FileCreateMode\s*.*/\$FileCreateMode 0640/' /etc/rsyslog.conf || echo "\$FileCreateMode 0640" >> /etc/rsyslog.conf
# Ensure permissions on all logfiles are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ all\ logfiles\ are\ configured
chmod -R g-w-x,o-r-w-x /var/log/.*
# Ensure cron daemon is enabled
echo
echo \*\*\*\* Ensure\ cron\ daemon\ is\ enabled
chkconfig crond on
# Ensure permissions on /etc/crontab are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/crontab\ are\ configured
chmod g-r-w-x,o-r-w-x /etc/crontab
# Ensure permissions on /etc/cron.hourly are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/cron.hourly\ are\ configured
chmod g-r-w-x,o-r-w-x /etc/cron.hourly
# Ensure permissions on /etc/cron.daily are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/cron.daily\ are\ configured
chmod g-r-w-x,o-r-w-x /etc/cron.daily
# Ensure permissions on /etc/cron.weekly are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/cron.weekly\ are\ configured
chmod g-r-w-x,o-r-w-x /etc/cron.weekly
# Ensure permissions on /etc/cron.monthly are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/cron.monthly\ are\ configured
chmod g-r-w-x,o-r-w-x /etc/cron.monthly
# Ensure permissions on /etc/cron.d are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/cron.d\ are\ configured
chmod g-r-w-x,o-r-w-x /etc/cron.d
# Ensure at/cron is restricted to authorized users
echo
echo \*\*\*\* Ensure\ at/cron\ is\ restricted\ to\ authorized\ users
rm /etc/cron.deny
rm /etc/at.deny
touch /etc/cron.allow
touch /etc/at.allow
chmod g-r-w-x,o-r-w-x /etc/cron.allow
chmod g-r-w-x,o-r-w-x /etc/at.allow
# Ensure permissions on /etc/ssh/sshd_config are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/ssh/sshd_config\ are\ configured
chmod g-r-w-x,o-r-w-x /etc/ssh/sshd_config
# Ensure SSH Protocol is set to 2
echo
echo \*\*\*\* Ensure\ SSH\ Protocol\ is\ set\ to\ 2
echo "" >> /etc/ssh/sshd_config
egrep -q "^(\s*)Protocol\s+\S+(\s*#.*)?\s*$" /etc/ssh/sshd_config && sed -ri "s/^(\s*)Protocol\s+\S+(\s*#.*)?\s*$/\1Protocol 2\2/" /etc/ssh/sshd_config || echo "Protocol 2" >> /etc/ssh/sshd_config
# Ensure SSH LogLevel is set to INFO
echo
echo \*\*\*\* Ensure\ SSH\ LogLevel\ is\ set\ to\ INFO
egrep -q "^(\s*)LogLevel\s+\S+(\s*#.*)?\s*$" /etc/ssh/sshd_config && sed -ri "s/^(\s*)LogLevel\s+\S+(\s*#.*)?\s*$/\1LogLevel INFO\2/" /etc/ssh/sshd_config || echo "LogLevel INFO" >> /etc/ssh/sshd_config
# Ensure SSH X11 forwarding is disabled
echo
echo \*\*\*\* Ensure\ SSH\ X11\ forwarding\ is\ disabled
egrep -q "^(\s*)X11Forwarding\s+\S+(\s*#.*)?\s*$" /etc/ssh/sshd_config && sed -ri "s/^(\s*)X11Forwarding\s+\S+(\s*#.*)?\s*$/\1X11Forwarding no\2/" /etc/ssh/sshd_config || echo "X11Forwarding no" >> /etc/ssh/sshd_config
# Ensure SSH MaxAuthTries is set to 4 or less
echo
echo \*\*\*\* Ensure\ SSH\ MaxAuthTries\ is\ set\ to\ 4\ or\ less
egrep -q "^(\s*)MaxAuthTries\s+\S+(\s*#.*)?\s*$" /etc/ssh/sshd_config && sed -ri "s/^(\s*)MaxAuthTries\s+\S+(\s*#.*)?\s*$/\1MaxAuthTries 4\2/" /etc/ssh/sshd_config || echo "MaxAuthTries 4" >> /etc/ssh/sshd_config
# Ensure SSH IgnoreRhosts is enabled
echo
echo \*\*\*\* Ensure\ SSH\ IgnoreRhosts\ is\ enabled
egrep -q "^(\s*)IgnoreRhosts\s+\S+(\s*#.*)?\s*$" /etc/ssh/sshd_config && sed -ri "s/^(\s*)IgnoreRhosts\s+\S+(\s*#.*)?\s*$/\1IgnoreRhosts yes\2/" /etc/ssh/sshd_config || echo "IgnoreRhosts yes" >> /etc/ssh/sshd_config
# Ensure SSH HostbasedAuthentication is disabled
echo
echo \*\*\*\* Ensure\ SSH\ HostbasedAuthentication\ is\ disabled
egrep -q "^(\s*)HostbasedAuthentication\s+\S+(\s*#.*)?\s*$" /etc/ssh/sshd_config && sed -ri "s/^(\s*)HostbasedAuthentication\s+\S+(\s*#.*)?\s*$/\1HostbasedAuthentication no\2/" /etc/ssh/sshd_config || echo "HostbasedAuthentication no" >> /etc/ssh/sshd_config
# Ensure SSH root login is disabled
echo
echo \*\*\*\* Ensure\ SSH\ root\ login\ is\ disabled
egrep -q "^(\s*)PermitRootLogin\s+\S+(\s*#.*)?\s*$" /etc/ssh/sshd_config && sed -ri "s/^(\s*)PermitRootLogin\s+\S+(\s*#.*)?\s*$/\1PermitRootLogin no\2/" /etc/ssh/sshd_config || echo "PermitRootLogin no" >> /etc/ssh/sshd_config
# Ensure SSH PermitEmptyPasswords is disabled
echo
echo \*\*\*\* Ensure\ SSH\ PermitEmptyPasswords\ is\ disabled
egrep -q "^(\s*)PermitEmptyPasswords\s+\S+(\s*#.*)?\s*$" /etc/ssh/sshd_config && sed -ri "s/^(\s*)PermitEmptyPasswords\s+\S+(\s*#.*)?\s*$/\1PermitEmptyPasswords no\2/" /etc/ssh/sshd_config || echo "PermitEmptyPasswords no" >> /etc/ssh/sshd_config
# Ensure SSH PermitUserEnvironment is disabled
echo
echo \*\*\*\* Ensure\ SSH\ PermitUserEnvironment\ is\ disabled
egrep -q "^(\s*)PermitUserEnvironment\s+\S+(\s*#.*)?\s*$" /etc/ssh/sshd_config && sed -ri "s/^(\s*)PermitUserEnvironment\s+\S+(\s*#.*)?\s*$/\1PermitUserEnvironment no\2/" /etc/ssh/sshd_config || echo "PermitUserEnvironment no" >> /etc/ssh/sshd_config
# Ensure only approved ciphers are used
echo
echo \*\*\*\* Ensure\ only\ approved\ ciphers\ are\ used
egrep -q "^(\s*)Ciphers\s+\S+(\s*#.*)?\s*$" /etc/ssh/sshd_config && sed -ri "s/^(\s*)Ciphers\s+\S+(\s*#.*)?\s*$/\Ciphers aes256-ctr,aes192-ctr,aes128-ctr\2/" /etc/ssh/sshd_config || echo "Ciphers aes256-ctr,aes192-ctr,aes128-ctr" >> /etc/ssh/sshd_config
# Ensure only approved MAC algorithms are used
echo
echo \*\*\*\* Ensure\ only\ approved\ MAC\ algorithms\ are\ used
egrep -q "^(\s*)MACs\s+\S+(\s*#.*)?\s*$" /etc/ssh/sshd_config && sed -ri "s/^(\s*)MACs\s+\S+(\s*#.*)?\s*$/\MACs [email protected],[email protected],[email protected],hmac-sha2-512,hmac-sha2-256,[email protected]\2/" /etc/ssh/sshd_config || echo "MACs [email protected],[email protected],[email protected],hmac-sha2-512,hmac-sha2-256,[email protected]" >> /etc/ssh/sshd_config
# Ensure SSH Idle Timeout Interval is configured
echo
echo \*\*\*\* Ensure\ SSH\ Idle\ Timeout\ Interval\ is\ configured
egrep -q "^(\s*)ClientAliveInterval\s+\S+(\s*#.*)?\s*$" /etc/ssh/sshd_config && sed -ri "s/^(\s*)ClientAliveInterval\s+\S+(\s*#.*)?\s*$/\1ClientAliveInterval 300\2/" /etc/ssh/sshd_config || echo "ClientAliveInterval 300" >> /etc/ssh/sshd_config
egrep -q "^(\s*)ClientAliveCountMax\s+\S+(\s*#.*)?\s*$" /etc/ssh/sshd_config && sed -ri "s/^(\s*)ClientAliveCountMax\s+\S+(\s*#.*)?\s*$/\1ClientAliveCountMax 3\2/" /etc/ssh/sshd_config || echo "ClientAliveCountMax 3" >> /etc/ssh/sshd_config
# Ensure SSH LoginGraceTime is set to one minute or less
echo
echo \*\*\*\* Ensure\ SSH\ LoginGraceTime\ is\ set\ to\ one\ minute\ or\ less
egrep -q "^(\s*)LoginGraceTime\s+\S+(\s*#.*)?\s*$" /etc/ssh/sshd_config && sed -ri "s/^(\s*)LoginGraceTime\s+\S+(\s*#.*)?\s*$/\1LoginGraceTime 60\2/" /etc/ssh/sshd_config || echo "LoginGraceTime 60" >> /etc/ssh/sshd_config
# Ensure SSH access is limited
echo
echo \*\*\*\* Ensure\ SSH\ access\ is\ limited
echo Ensure\ SSH\ access\ is\ limited not configured.
# Ensure SSH warning banner is configured
echo
echo \*\*\*\* Ensure\ SSH\ warning\ banner\ is\ configured
egrep -q "^(\s*)Banner\s+\S+(\s*#.*)?\s*$" /etc/ssh/sshd_config && sed -ri "s/^(\s*)Banner\s+\S+(\s*#.*)?\s*$/\1Banner \/etc\/issue.net\2/" /etc/ssh/sshd_config || echo "Banner /etc/issue.net" >> /etc/ssh/sshd_config
# Ensure lockout for failed password attempts is configured
echo
echo \*\*\*\* Ensure\ lockout\ for\ failed\ password\ attempts\ is\ configured
echo Ensure\ lockout\ for\ failed\ password\ attempts\ is\ configured not configured.
authconfig --enablefaillock --faillockargs="audit deny=5 unlock_time=1800" --update
# Ensure password creation requirements are configured
echo
echo \*\*\*\* Ensure\ password\ creation\ requirements\ are\ configured
egrep -q "^(\s*)minlen\s*=\s*\S+(\s*#.*)?\s*$" /etc/security/pwquality.conf && sed -ri "s/^(\s*)minlen\s*=\s*\S+(\s*#.*)?\s*$/minlen=14\2/" /etc/security/pwquality.conf || echo "minlen=14" >> /etc/security/pwquality.conf
egrep -q "^(\s*)dcredit\s*=\s*\S+(\s*#.*)?\s*$" /etc/security/pwquality.conf && sed -ri "s/^(\s*)dcredit\s*=\s*\S+(\s*#.*)?\s*$/dcredit=-1\2/" /etc/security/pwquality.conf || echo "dcredit=-1" >> /etc/security/pwquality.conf
egrep -q "^(\s*)ucredit\s*=\s*\S+(\s*#.*)?\s*$" /etc/security/pwquality.conf && sed -ri "s/^(\s*)ucredit\s*=\s*\S+(\s*#.*)?\s*$/ucredit=-1\2/" /etc/security/pwquality.conf || echo "ucredit=-1" >> /etc/security/pwquality.conf
egrep -q "^(\s*)ocredit\s*=\s*\S+(\s*#.*)?\s*$" /etc/security/pwquality.conf && sed -ri "s/^(\s*)ocredit\s*=\s*\S+(\s*#.*)?\s*$/ocredit=-1\2/" /etc/security/pwquality.conf || echo "ocredit=-1" >> /etc/security/pwquality.conf
egrep -q "^(\s*)lcredit\s*=\s*\S+(\s*#.*)?\s*$" /etc/security/pwquality.conf && sed -ri "s/^(\s*)lcredit\s*=\s*\S+(\s*#.*)?\s*$/lcredit=-1\2/" /etc/security/pwquality.conf || echo "lcredit=-1" >> /etc/security/pwquality.conf
egrep -q "^\s*password\s+requisite\s+pam_pwquality.so\s+" /etc/pam.d/system-auth && sed -ri '/^\s*password\s+requisite\s+pam_pwquality.so\s+/ { /^\s*password\s+requisite\s+pam_pwquality.so(\s+\S+)*(\s+try_first_pass)(\s+.*)?$/! s/^(\s*password\s+requisite\s+pam_pwquality.so\s+)(.*)$/\1try_first_pass \2/ }' /etc/pam.d/system-auth && sed -ri '/^\s*password\s+requisite\s+pam_pwquality.so\s+/ { /^\s*password\s+requisite\s+pam_pwquality.so(\s+\S+)*(\s+retry=[0-9]+)(\s+.*)?$/! s/^(\s*password\s+requisite\s+pam_pwquality.so\s+)(.*)$/\1retry=3 \2/ }' /etc/pam.d/system-auth && sed -ri 's/(^\s*password\s+requisite\s+pam_pwquality.so(\s+\S+)*\s+)retry=[0-9]+(\s+.*)?$/\1retry=3\3/' /etc/pam.d/system-auth || echo Ensure\ password\ creation\ requirements\ are\ configured - /etc/pam.d/system-auth not configured.
egrep -q "^\s*password\s+requisite\s+pam_pwquality.so\s+" /etc/pam.d/password-auth && sed -ri '/^\s*password\s+requisite\s+pam_pwquality.so\s+/ { /^\s*password\s+requisite\s+pam_pwquality.so(\s+\S+)*(\s+try_first_pass)(\s+.*)?$/! s/^(\s*password\s+requisite\s+pam_pwquality.so\s+)(.*)$/\1try_first_pass \2/ }' /etc/pam.d/password-auth && sed -ri '/^\s*password\s+requisite\s+pam_pwquality.so\s+/ { /^\s*password\s+requisite\s+pam_pwquality.so(\s+\S+)*(\s+retry=[0-9]+)(\s+.*)?$/! s/^(\s*password\s+requisite\s+pam_pwquality.so\s+)(.*)$/\1retry=3 \2/ }' /etc/pam.d/password-auth && sed -ri 's/(^\s*password\s+requisite\s+pam_pwquality.so(\s+\S+)*\s+)retry=[0-9]+(\s+.*)?$/\1retry=3\3/' /etc/pam.d/password-auth || echo Ensure\ password\ creation\ requirements\ are\ configured - /etc/pam.d/password-auth not configured.
# Ensure password reuse is limited
echo
echo \*\*\*\* Ensure\ password\ reuse\ is\ limited
egrep -q "^\s*password\s+sufficient\s+pam_unix.so(\s+.*)$" /etc/pam.d/system-auth && sed -ri '/^\s*password\s+sufficient\s+pam_unix.so\s+/ { /^\s*password\s+sufficient\s+pam_unix.so(\s+\S+)*(\s+remember=[0-9]+)(\s+.*)?$/! s/^(\s*password\s+sufficient\s+pam_unix.so\s+)(.*)$/\1remember=10 \2/ }' /etc/pam.d/system-auth && sed -ri 's/(^\s*password\s+sufficient\s+pam_unix.so(\s+\S+)*\s+)remember=[0-9]+(\s+.*)?$/\1remember=10\3/' /etc/pam.d/system-auth || echo Ensure\ password\ reuse\ is\ limited - /etc/pam.d/system-auth not configured.
egrep -q "^\s*password\s+sufficient\s+pam_unix.so(\s+.*)$" /etc/pam.d/password-auth && sed -ri '/^\s*password\s+sufficient\s+pam_unix.so\s+/ { /^\s*password\s+sufficient\s+pam_unix.so(\s+\S+)*(\s+remember=[0-9]+)(\s+.*)?$/! s/^(\s*password\s+sufficient\s+pam_unix.so\s+)(.*)$/\1remember=10 \2/ }' /etc/pam.d/password-auth && sed -ri 's/(^\s*password\s+sufficient\s+pam_unix.so(\s+\S+)*\s+)remember=[0-9]+(\s+.*)?$/\1remember=10\3/' /etc/pam.d/password-auth || echo Ensure\ password\ reuse\ is\ limited - /etc/pam.d/password-auth not configured.
# Ensure password hashing algorithm is SHA-512
echo
echo \*\*\*\* Ensure\ password\ hashing\ algorithm\ is\ SHA-512
egrep -q "^\s*password\s+sufficient\s+pam_unix.so\s+" /etc/pam.d/system-auth && sed -ri '/^\s*password\s+sufficient\s+pam_unix.so\s+/ { /^\s*password\s+sufficient\s+pam_unix.so(\s+\S+)*(\s+sha512)(\s+.*)?$/! s/^(\s*password\s+sufficient\s+pam_unix.so\s+)(.*)$/\1sha512 \2/ }' /etc/pam.d/system-auth || echo Ensure\ password\ hashing\ algorithm\ is\ SHA-512 - /etc/pam.d/password-auth not configured.
egrep -q "^\s*password\s+sufficient\s+pam_unix.so\s+" /etc/pam.d/password-auth && sed -ri '/^\s*password\s+sufficient\s+pam_unix.so\s+/ { /^\s*password\s+sufficient\s+pam_unix.so(\s+\S+)*(\s+sha512)(\s+.*)?$/! s/^(\s*password\s+sufficient\s+pam_unix.so\s+)(.*)$/\1sha512 \2/ }' /etc/pam.d/password-auth || echo Ensure\ password\ hashing\ algorithm\ is\ SHA-512 - /etc/pam.d/password-auth not configured.
# Ensure password expiration is 90 days or less
echo
echo \*\*\*\* Ensure\ password\ expiration\ is\ 90\ days\ or\ less
egrep -q "^(\s*)PASS_MAX_DAYS\s+\S+(\s*#.*)?\s*$" /etc/login.defs && sed -ri "s/^(\s*)PASS_MAX_DAYS\s+\S+(\s*#.*)?\s*$/\PASS_MAX_DAYS 90\2/" /etc/login.defs || echo "PASS_MAX_DAYS 90" >> /etc/login.defs
getent passwd | cut -f1 -d ":" | xargs -n1 chage --maxdays 90
# Ensure minimum days between password changes is 7 or more
echo
echo \*\*\*\* Ensure\ minimum\ days\ between\ password\ changes\ is\ 7\ or\ more
egrep -q "^(\s*)PASS_MIN_DAYS\s+\S+(\s*#.*)?\s*$" /etc/login.defs && sed -ri "s/^(\s*)PASS_MIN_DAYS\s+\S+(\s*#.*)?\s*$/\PASS_MIN_DAYS 7\2/" /etc/login.defs || echo "PASS_MIN_DAYS 7" >> /etc/login.defs
getent passwd | cut -f1 -d ":" | xargs -n1 chage --mindays 7
# Ensure password expiration warning days is 7 or more
echo
echo \*\*\*\* Ensure\ password\ expiration\ warning\ days\ is\ 7\ or\ more
egrep -q "^(\s*)PASS_WARN_AGE\s+\S+(\s*#.*)?\s*$" /etc/login.defs && sed -ri "s/^(\s*)PASS_WARN_AGE\s+\S+(\s*#.*)?\s*$/\PASS_WARN_AGE 7\2/" /etc/login.defs || echo "PASS_WARN_AGE 7" >> /etc/login.defs
getent passwd | cut -f1 -d ":" | xargs -n1 chage --warndays 7
# Ensure inactive password lock is 30 days or less
echo
echo \*\*\*\* Ensure\ inactive\ password\ lock\ is\ 30\ days\ or\ less
useradd -D -f 30
getent passwd | cut -f1 -d ":" | xargs -n1 chage --inactive 30
# Ensure system accounts are non-login
echo
echo \*\*\*\* Ensure\ system\ accounts\ are\ non-login
for user in `awk -F: '($3 < 500) {print $1 }' /etc/passwd`; do
if [ $user != "root" ]
then
/usr/sbin/usermod -L $user
if [ $user != "sync" ] && [ $user != "shutdown" ] && [ $user != "halt" ]
then
/usr/sbin/usermod -s /sbin/nologin $user
fi
fi
done
# Ensure default group for the root account is GID 0
echo
echo \*\*\*\* Ensure\ default\ group\ for\ the\ root\ account\ is\ GID\ 0
usermod -g 0 root
# Ensure default user umask is 027 or more restrictive
echo
echo \*\*\*\* Ensure\ default\ user\ umask\ is\ 027\ or\ more\ restrictive
egrep -q "^(\s*)umask\s+\S+(\s*#.*)?\s*$" /etc/bashrc && sed -ri "s/^(\s*)umask\s+\S+(\s*#.*)?\s*$/\1umask 077\2/" /etc/bashrc || echo "umask 077" >> /etc/bashrc
egrep -q "^(\s*)umask\s+\S+(\s*#.*)?\s*$" /etc/profile && sed -ri "s/^(\s*)umask\s+\S+(\s*#.*)?\s*$/\1umask 077\2/" /etc/profile || echo "umask 077" >> /etc/profile
# Ensure access to the su command is restricted
echo
echo \*\*\*\* Ensure\ access\ to\ the\ su\ command\ is\ restricted
egrep -q "^\s*auth\s+required\s+pam_wheel.so(\s+.*)?$" /etc/pam.d/su && sed -ri '/^\s*auth\s+required\s+pam_wheel.so(\s+.*)?$/ { /^\s*auth\s+required\s+pam_wheel.so(\s+\S+)*(\s+use_uid)(\s+.*)?$/! s/^(\s*auth\s+required\s+pam_wheel.so)(\s+.*)?$/\1 use_uid\2/ }' /etc/pam.d/su || echo "auth required pam_wheel.so use_uid" >> /etc/pam.d/su
# Ensure permissions on /etc/passwd are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/passwd\ are\ configured
chmod -t,u+r+w-x-s,g+r-w-x-s,o+r-w-x /etc/passwd
# Ensure permissions on /etc/shadow are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/shadow\ are\ configured
chmod -t,u-x-s,g-w-x-s,o-r-w-x /etc/shadow
# Ensure permissions on /etc/group are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/group\ are\ configured
chmod -t,u+r+w-x-s,g+r-w-x-s,o+r-w-x /etc/group
# Ensure permissions on /etc/gshadow are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/gshadow\ are\ configured
chmod -t,u-x-s,g-w-x-s,o-r-w-x /etc/gshadow
# Ensure permissions on /etc/passwd- are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/passwd-\ are\ configured
chmod -t,u-x-s,g-r-w-x-s,o-r-w-x /etc/passwd-
# Ensure permissions on /etc/shadow- are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/shadow-\ are\ configured
chmod -t,u-x-s,g-r-w-x-s,o-r-w-x /etc/shadow-
# Ensure permissions on /etc/group- are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/group-\ are\ configured
chmod -t,u-x-s,g-r-w-x-s,o-r-w-x /etc/group-
# Ensure permissions on /etc/gshadow- are configured
echo
echo \*\*\*\* Ensure\ permissions\ on\ /etc/gshadow-\ are\ configured
chmod -t,u-x-s,g-r-w-x-s,o-r-w-x /etc/gshadow-
# Ensure no world writable files exist
echo
echo \*\*\*\* Ensure\ no\ world\ writable\ files\ exist
echo Ensure\ no\ world\ writable\ files\ exist Linux custom object not configured.
# Ensure no unowned files or directories exist
echo
echo \*\*\*\* Ensure\ no\ unowned\ files\ or\ directories\ exist
echo Ensure\ no\ unowned\ files\ or\ directories\ exist Linux custom object not configured.
# Ensure no ungrouped files or directories exist
echo
echo \*\*\*\* Ensure\ no\ ungrouped\ files\ or\ directories\ exist
echo Ensure\ no\ ungrouped\ files\ or\ directories\ exist Linux custom object not configured.
# Ensure password fields are not empty
echo
echo \*\*\*\* Ensure\ password\ fields\ are\ not\ empty
echo Ensure\ password\ fields\ are\ not\ empty not configured.
# Ensure no legacy "+" entries exist in /etc/passwd
echo
echo \*\*\*\* Ensure\ no\ legacy\ \"\;\+\"\;\ entries\ exist\ in\ /etc/passwd
sed -ri '/^\+:.*$/ d' /etc/passwd
# Ensure no legacy "+" entries exist in /etc/shadow
echo
echo \*\*\*\* Ensure\ no\ legacy\ \"\;\+\"\;\ entries\ exist\ in\ /etc/shadow
sed -ri '/^\+:.*$/ d' /etc/shadow
# Ensure no legacy "+" entries exist in /etc/group
echo
echo \*\*\*\* Ensure\ no\ legacy\ \"\;\+\"\;\ entries\ exist\ in\ /etc/group
sed -ri '/^\+:.*$/ d' /etc/group
# Ensure root is the only UID 0 account
echo
echo \*\*\*\* Ensure\ root\ is\ the\ only\ UID\ 0\ account
echo Ensure\ root\ is\ the\ only\ UID\ 0\ account not configured.
# Ensure root PATH Integrity
echo
echo \*\*\*\* Ensure\ root\ PATH\ Integrity
echo Ensure\ root\ PATH\ Integrity Linux custom object not configured.
# Ensure all users' home directories exist
echo
echo \*\*\*\* Ensure\ all\ users\'\ home\ directories\ exist
echo Ensure\ all\ users\'\ home\ directories\ exist Linux custom object not configured.
# Ensure users' home directories permissions are 750 or more restrictive
echo
echo \*\*\*\* Ensure\ users\'\ home\ directories\ permissions\ are\ 750\ or\ more\ restrictive
echo Ensure\ users\'\ home\ directories\ permissions\ are\ 750\ or\ more\ restrictive Linux custom object not configured.
# Ensure users own their home directories
echo
echo \*\*\*\* Ensure\ users\ own\ their\ home\ directories
echo Ensure\ users\ own\ their\ home\ directories not configured.
# Ensure users' dot files are not group or world writable
echo
echo \*\*\*\* Ensure\ users\'\ dot\ files\ are\ not\ group\ or\ world\ writable
echo Ensure\ users\'\ dot\ files\ are\ not\ group\ or\ world\ writable Linux custom object not configured.
# Ensure no users have .forward files
echo
echo \*\*\*\* Ensure\ no\ users\ have\ .forward\ files
echo Ensure\ no\ users\ have\ .forward\ files Linux custom object not configured.
# Ensure no users have .netrc files
echo
echo \*\*\*\* Ensure\ no\ users\ have\ .netrc\ files
echo Ensure\ no\ users\ have\ .netrc\ files Linux custom object not configured.
# Ensure users' .netrc Files are not group or world accessible
echo
echo \*\*\*\* Ensure\ users\'\ .netrc\ Files\ are\ not\ group\ or\ world\ accessible
echo Ensure\ users\'\ .netrc\ Files\ are\ not\ group\ or\ world\ accessible Linux custom object not configured.
# Ensure no users have .rhosts files
echo
echo \*\*\*\* Ensure\ no\ users\ have\ .rhosts\ files
echo Ensure\ no\ users\ have\ .rhosts\ files Linux custom object not configured.
# Ensure all groups in /etc/passwd exist in /etc/group
echo
echo \*\*\*\* Ensure\ all\ groups\ in\ /etc/passwd\ exist\ in\ /etc/group
echo Ensure\ all\ groups\ in\ /etc/passwd\ exist\ in\ /etc/group Linux custom object not configured.
# Ensure no duplicate UIDs exist
echo
echo \*\*\*\* Ensure\ no\ duplicate\ UIDs\ exist
echo Ensure\ no\ duplicate\ UIDs\ exist Linux custom object not configured.
# Ensure no duplicate GIDs exist
echo
echo \*\*\*\* Ensure\ no\ duplicate\ GIDs\ exist
echo Ensure\ no\ duplicate\ GIDs\ exist Linux custom object not configured.
# Ensure no duplicate user names exist
echo
echo \*\*\*\* Ensure\ no\ duplicate\ user\ names\ exist
echo Ensure\ no\ duplicate\ user\ names\ exist Linux custom object not configured.
# Ensure no duplicate group names exist
echo
echo \*\*\*\* Ensure\ no\ duplicate\ group\ names\ exist
echo Ensure\ no\ duplicate\ group\ names\ exist Linux custom object not configured.
fi
if [ "$PROFILE" = "Level 2" ]; then
echo \*\*\*\* Executing Level 2 profile remediation
# Ensure separate partition exists for /tmp
echo
echo \*\*\*\* Ensure\ separate\ partition\ exists\ for\ /tmp
echo Ensure\ separate\ partition\ exists\ for\ /tmp not configured.
# Ensure separate partition exists for /var
echo
echo \*\*\*\* Ensure\ separate\ partition\ exists\ for\ /var
echo Ensure\ separate\ partition\ exists\ for\ /var not configured.
# Ensure separate partition exists for /var/tmp
echo
echo \*\*\*\* Ensure\ separate\ partition\ exists\ for\ /var/tmp
echo Ensure\ separate\ partition\ exists\ for\ /var/tmp not configured.
# Ensure separate partition exists for /var/log
echo
echo \*\*\*\* Ensure\ separate\ partition\ exists\ for\ /var/log
echo Ensure\ separate\ partition\ exists\ for\ /var/log not configured.
# Ensure separate partition exists for /var/log/audit
echo
echo \*\*\*\* Ensure\ separate\ partition\ exists\ for\ /var/log/audit
echo Ensure\ separate\ partition\ exists\ for\ /var/log/audit not configured.
# Ensure separate partition exists for /home
echo
echo \*\*\*\* Ensure\ separate\ partition\ exists\ for\ /home
echo Ensure\ separate\ partition\ exists\ for\ /home not configured.
# Ensure SELinux is not disabled in bootloader configuration
echo
echo \*\*\*\* Ensure\ SELinux\ is\ not\ disabled\ in\ bootloader\ configuration
echo Ensure\ SELinux\ is\ not\ disabled\ in\ bootloader\ configuration not configured.
# Ensure the SELinux state is enforcing
echo
echo \*\*\*\* Ensure\ the\ SELinux\ state\ is\ enforcing
echo Ensure\ the\ SELinux\ state\ is\ enforcing not configured.
# Ensure SELinux policy is configured