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hardening_script.sh
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hardening_script.sh
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#! /bin/bash
# This script has been written to semi-automate the hardening of stand-alone Fedora machines for a specific use case
# It is based on the 'CIS Red Hat Enterprise Linux 7 Benchmark' Level 1 for Workstations but has been amended for Fedora
# The machines will be used for development so some controls have been removed to ensure it doesn't impact usability
# The removed controls are still in this script but commented-out so can be easily added back if needed
#########################################################################################################################################
# Confirming that the script has been run with sudo
if [[ $EUID -ne 0 ]]; then
echo "You need to run this script as root (with sudo)"
exit
fi
echo "[i] Beginning hardening process"
#########################################################################################################################################
# Updating system
echo "[i] Updating the OS"
yum -y upgrade
#########################################################################################################################################
# 1.1.1.1 Ensure mounting of cramfs filesystems is disabled
echo "[i] Disabling the mounting of cramfs filesystems"
if [ -f "/etc/modprobe.d/CIS.conf" ]; then
echo "install cramfs /bin/true" >> /etc/modprobe.d/CIS.conf
else
echo "install cramfs /bin/true" > /etc/modprobe.d/CIS.conf
fi
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.1.1.2 Ensure mounting of freevxfs filesystems is disabled
echo "[i] Disabling the mounting of freevxfs filesystems"
echo "install freevxfs /bin/true" >> /etc/modprobe.d/CIS.conf
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.1.1.3 Ensure mounting of jffs2 filesystems is disabled
echo "[i] Disabling the mounting of jffs2 filesystems"
echo "install jffs2 /bin/true" >> /etc/modprobe.d/CIS.conf
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.1.1.4 Ensure mounting of hfs filesystems is disabled
echo "[i] Disabling the mounting of hfs filesystems"
echo "install hfs /bin/true" >> /etc/modprobe.d/CIS.conf
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.1.1.5 Ensure mounting of hfsplus filesystems is disabled
echo "[i] Disabling the mounting of hfsplus filesystems"
echo "install hfsplus /bin/true" >> /etc/modprobe.d/CIS.conf
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.1.1.6 Ensure mounting of squashfs filesystems is disabled
echo "[i] Disabling the mounting of squashfs filesystems"
echo "install squashfs /bin/true" >> /etc/modprobe.d/CIS.conf
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.1.1.7 Ensure mounting of udf filesystems is disabled
echo "[i] Disabling the mounting of udf filesystems"
echo "install udf /bin/true" >> /etc/modprobe.d/CIS.conf
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.1.1.8 Ensure mounting of FAT filesystems is disabled
# echo "[i] Disabling the mounting of FAT filesystems"
# echo "install vfat /bin/true" >> /etc/modprobe.d/CIS.conf
# This has been disabled as there is a need to use portable USB drives which are often FAT formatted.
#########################################################################################################################################
# 1.1.3 Ensure nodev option set on /tmp partition
# 1.1.4 Ensure nosuid option set on /tmp partition
# 1.1.5 Ensure noexec option set on /tmp partition
# This cannot currently be deployed as there is a known bug in RHEL 8 (https://bugzilla.redhat.com/show_bug.cgi?id=1667065)
# Isn't the end of the world though as the nodev, noexec and nosuid options should be set by default
#echo "[i] Setting nodev, nosuid and noexec options on the /tmp partition"
#systemctl unmask tmp.mount
#systemctl enable tmp.mount
#sed -i -e 's/\(Options=\).*/\1mode=1777,strictatime,noexec,nodev,nosuid/' /etc/systemd/system/local-fs.target.wants/tmp.mount
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.1.8 Ensure nodev option set on /var/tmp partition
# 1.1.9 Ensure nosuid option set on /var/tmp partition
# 1.1.10 Ensure noexec option set on /var/tmp partition
echo "[i] Setting nodev, nosuid and noexec options on the /var/tmp partition"
LINEVARTMP="tmpfs /var/tmp tmpfs nosuid,noexec,nodev 0 0"
grep -F "$LINEVARTMP" /etc/fstab || echo "$LINEVARTMP" | tee -a /etc/fstab > /dev/null
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.1.14 Ensure nodev option set on /home partition
echo "[i] Setting nodev option on the /home partition"
echo "[i] If you have a separate home partition, you need to provide it's name"
echo "[i] If a separate home partition doesn't exist, leave this blank."
echo "[i] Home partition example: /dev/xvda1"
read -p "[?] Enter home partition: " HOME_PARTITION
if [ -b $HOME_PARTITION ]
then
LINEHOME="$HOME_PARTITION /home ext4 rw,relatime,nodev,data=ordered 0 0"
grep -F "$LINEHOME" /etc/fstab || echo "$LINEHOME" | tee -a /etc/fstab > /dev/null
fi
mount -o remount,nodev /home
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.1.15 Ensure nodev option set on /dev/shm partition
# 1.1.16 Ensure nosuid option set on /dev/shm partition
# 1.1.17 Ensure noexec option set on /dev/shm partition
echo "[i] Setting nodev, nosuid and noexec options on the /dev/shm partition"
LINEDEVSHM="tmpfs /dev/shm tmpfs nosuid,noexec,nodev,relatime,rw 0 0"
grep -F "$LINEDEVSHM" /etc/fstab || echo "$LINEDEVSHM" | tee -a /etc/fstab > /dev/null
mount -o remount,nodev,nosuid,noexec /dev/shm
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.1.21 Ensure sticky bit is set on all world-writable directories
echo "[i] Setting the sticky bit on all world-writable directories"
df --local -P | awk {'if (NR!=1) print $6'} | xargs -I '{}' find '{}' -xdev -type d -perm -0002 2>/dev/null | xargs chmod a+t
#########################################################################################################################################
# 1.2.2 Ensure gpgcheck is globally activated
echo "[i] Globally activating gpgcheck"
echo "gpgcheck=1" > /etc/yum.conf
#########################################################################################################################################
# 1.3.1 Ensure AIDE is installed
echo "[i] Installing, configuring and initialising AIDE (the file integrity checking tool)"
# Installing AIDE:
yum -y install aide
# Inistialising AIDE
aide --init
mv /var/lib/aide/aide.db.new.gz /var/lib/aide/aide.db.gz
# Due to a bug in Red Hat there will be some errors reported that 'algorithm 7 not available'
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.3.2 Ensure filesystem integrity is regularly checked
echo "[i] Creating a cron job to regularly check filesystem integrity using AIDE"
LINEAIDECRON="0 5 * * * /usr/bin/aide.wrapper --config /etc/aide/aide.conf --check"
AIDECRONFILE=/home/tmp.cron
crontab -l -u root 2>/dev/null
if [ $? -eq 0 ]
then
crontab -u root -l > $AIDECRONFILE
else
touch $AIDECRONFILE
fi
grep -qF "$LINEAIDECRON" "$AIDECRONFILE" || echo "$LINEAIDECRON" | tee -a "$AIDECRONFILE" > /dev/null
crontab -u root $AIDECRONFILE
rm $AIDECRONFILE
#########################################################################################################################################
# 1.4.1 Ensure permissions on bootloader config are configured
echo "[i] Setting correct permissions for the bootloader config"
chown root:root /boot/efi/EFI/fedora/grub.cfg
chmod og-rwx /boot/efi/EFI/fedora/grub.cfg
# chown root:root /boot/efi/EFI/fedora/user.cfg
# chmod og-rwx /boot/efi/EFI/fedora/user.cfg
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.4.2 Ensure bootloader password is set
# echo "[i] Setting bootloader password"
# grub2-setpassword
# This isn't required as LUKS is configured for full disk encryption during the anaconda installation so a boot
# passphrase is already needed to decrypt the disk and boot the OS
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.4.3 Ensure authentication required for single user mode
echo "[i] Configuring 'single user mode' to require authentication"
if grep -q "ExecStart=" /usr/lib/systemd/system/rescue.service; then
sed -i 's/^ExecStart=.*/ExecStart=-\/bin\/sh -c "\/sbin\/sulogin; \/usr\/bin\/systemctl --fail --no-block default"/' /usr/lib/systemd/system/rescue.service
else
echo "ExecStart=-/bin/sh -c \"/sbin/sulogin; /usr/bin/systemctl --fail --no-block default\"" >> /usr/lib/systemd/system/rescue.service
fi
if grep -q "ExecStart=" /usr/lib/systemd/system/emergency.service; then
sed -i 's/^ExecStart=.*/ExecStart=-\/bin\/sh -c "\/sbin\/sulogin; \/usr\/bin\/systemctl --fail --no-block default"/' /usr/lib/systemd/system/emergency.service
else
echo "ExecStart=-/bin/sh -c \"/sbin/sulogin; /usr/bin/systemctl --fail --no-block default\"" >> /usr/lib/systemd/system/emergency.service
fi
#########################################################################################################################################
# 1.5.1 Ensure core dumps are restricted
echo "[i] Ensuring core dumps are restricted"
DUMPLINE="* hard core 0"
DUMPFILE=/etc/security/limits.conf
grep -qF "$DUMPLINE" "$DUMPFILE" || echo "$DUMPLINE" | tee -a "$DUMPFILE" > /dev/null
DUMPABLELINE="fs.suid_dumpable=0"
DUMPABLEFILE=/etc/sysctl.conf
grep -qF "$DUMPABLELINE" "$DUMPABLEFILE" || echo "$DUMPABLELINE" | tee -a "$DUMPABLEFILE" > /dev/null
sysctl -w fs.suid_dumpable=0
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.5.3 Ensure address space layout randomization (ASLR) is enabled
echo "[i] Enabling address space layout randomization (ASLR)"
if grep -q "^kernel.randomize_va_space" /etc/sysctl.conf; then
sed -i 's/^kernel.randomize_va_space.*/kernel.randomize_va_space = 2/' /etc/sysctl.conf
else
echo "kernel.randomize_va_space = 2" >> /etc/sysctl.conf
fi
sysctl -w kernel.randomize_va_space=2
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.5.4 Ensure prelink is disabled
# echo "[i] Restoring the prelink binaries to normal"
# prelink -ua
# echo "[i] Uninstalling prelink"
# yum -y remove prelink
# prelink is not installed in Fedora
#########################################################################################################################################
# 1.7.1.1 Ensure message of the day is configured properly
echo "[i] Creating the message of the day"
echo "Unauthorised use of this system is an offence under the Computer Misuse Act 1990. All activity may be monitored and reported." > /etc/motd
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.7.1.2 Ensure local login warning banner is configured properly
echo "[i] Creating the local login warning banner"
echo "Unauthorised use of this system is an offence under the Computer Misuse Act 1990. All activity may be monitored and reported." > /etc/issue
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.7.1.3 Ensure remote login warning banner is configured properly
echo "[i] Creating the remote login warning banner"
echo "Unauthorised use of this system is an offence under the Computer Misuse Act 1990. All activity may be monitored and reported." > /etc/issue.net
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.7.1.4 Ensure permissions on /etc/motd are configured
echo "[i] Setting correct permissions on /etc/motd"
chown root:root /etc/motd
chmod 644 /etc/motd
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.7.1.5 Ensure permissions on /etc/issue are configured
echo "[i] Setting correct permissions on /etc/issue"
chown root:root /etc/issue
chmod 644 /etc/issue
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.7.1.6 Ensure permissions on /etc/issue.net are configured
echo "[i] Setting correct permissions on /etc/issue.net"
chown root:root /etc/issue.net
chmod 644 /etc/issue.net
#---------------------------------------------------------------------------------------------------------------------------------------#
# 1.7.2 Ensure GDM login banner is configured
echo "[i] Setting the GDM login banner"
echo "user-db:user" > /etc/dconf/profile/gdm
echo "system-db:gdm" >> /etc/dconf/profile/gdm
echo "file-db:/usr/share/gdm/greeter-dconf-defaults" >> /etc/dconf/profile/gdm
makedir /etc/dconf/db/gdm.d/
echo "[org/gnome/login-screen]" > /etc/dconf/db/gdm.d/01-banner-message
echo "banner-message-enable=true" >> /etc/dconf/db/gdm.d/01-banner-message
echo "banner-message-text='Unauthorised use of this system is an offence under the Computer Misuse Act 1990. All activity may be monitored and reported.'" >> /etc/dconf/db/gdm.d/01-banner-message
dconf update
#########################################################################################################################################
# None of these are needed because Fedora doesn't come with the inetd services installed
# 1.8.1 Ensure updates, patches, and additional security software are installed
# 2.1.1 Ensure chargen services are not enabled
# echo "[i] Turning off chargen services"
# chkconfig chargen-dgram off
# chkconfig chargen-stream off
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.1.2 Ensure daytime services are not enabled
# echo "[i] Turning off daytime services"
# chkconfig daytime-dgram off
# chkconfig daytime-stream off
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.1.3 Ensure discard services are not enabled
# echo "[i] Turning off discard services"
# chkconfig discard-dgram off
# chkconfig discard-stream off
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.1.4 Ensure echo services are not enabled
# echo "[i] Turning off echo services"
# chkconfig echo-dgram off
# chkconfig echo-stream off
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.1.5 Ensure time services are not enabled
# echo "[i] Turning off time services"
# chkconfig time-dgram off
# chkconfig time-stream off
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.1.6 Ensure tftp server is not enabled
# echo "[i] Turning off tftp server"
# chkconfig tftp off
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.1.7 Ensure xinetd is not enabled
# echo "[i] Turning off xinetd"
# systemctl disable xinetd
#########################################################################################################################################
# 2.2.1.2 Ensure ntp is configured
echo "[i] Installing ntp"
yum -y install ntp
echo "[i] Configuring ntp"
echo "restrict -4 default kod nomodify notrap nopeer noquery" > /etc/ntp.conf
echo "restrict -6 default kod nomodify notrap nopeer noquery" >> /etc/ntp.conf
# Adding NTP servers for the UK
echo "server 0.uk.pool.ntp.org" >> /etc/ntp.conf
echo "server 1.uk.pool.ntp.org" >> /etc/ntp.conf
echo "server 2.uk.pool.ntp.org" >> /etc/ntp.conf
echo "server 3.uk.pool.ntp.org" >> /etc/ntp.conf
# Adding '-u ntp:ntp' to the /etc/sysconfig/ntpd
if grep -q "^OPTIONS=" /etc/sysconfig/ntpd; then
sed -i 's/^OPTIONS=.*/OPTIONS="-u ntp:ntp"/' /etc/sysconfig/ntpd
else
echo "OPTIONS=\"-u ntp:ntp\"" >> /etc/init.d/ntp
fi
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.2.1.3 Ensure chrony is configured
echo "[i] Configuring chrony"
sed -i 's/^pool.*/#/' /etc/chrony.conf
# Adding NTP servers for the UK
echo "server 0.uk.pool.ntp.org" >> /etc/chrony.conf
echo "server 1.uk.pool.ntp.org" >> /etc/chrony.conf
echo "server 2.uk.pool.ntp.org" >> /etc/chrony.conf
echo "server 3.uk.pool.ntp.org" >> /etc/chrony.conf
#########################################################################################################################################
# 2.2.3 Ensure Avahi Server is not enabled
echo "[i] Disabling Avahi Server"
systemctl disable avahi-daemon
#---------------------------------------------------------------------------------------------------------------------------------------#
# DHCP Server isn't installed in Fedora by default
# 2.2.5 Ensure DHCP Server is not enabled
# echo "[i] Disabling DHCP Server"
# systemctl disable isc-dhcp-server
# systemctl disable isc-dhcp-server6
#---------------------------------------------------------------------------------------------------------------------------------------#
# LDAP isn't installed in Fedora by default
# 2.2.6 Ensure LDAP server is not enabled
# echo "[i] Disabling LDAP server"
# systemctl disable slapd
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.2.7 Ensure NFS and RPC are not enabled
echo "[i] Disabling NFS and RPC"
systemctl disable nfs-server
systemctl disable rpcbind
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.2.8 Ensure DNS Server is not enabled
# DNS Server isn't installed by default in Fedora
# echo "[i] Disabling DNS Server"
# systemctl disable bind9
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.2.9 Ensure FTP Server is not enabled
# FTP Server isn't installed by default in Fedora
# echo "[i] Disabling FTP Server"
# systemctl disable vsftpd
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.2.10 Ensure HTTP Server is not enabled
# Apache Server isn't installed by default in Fedora
# echo "[i] Disabling HTTP Server"
# systemctl disable apache2
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.2.11 Ensure IMAP and POP3 server is not enabled
# dovecot Server isn't installed by default in Fedora
# echo "[i] Disabling IMAP and POP3 Server"
# systemctl disable dovecot
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.2.12 Ensure Samba is not enabled
# Samba isn't installed by default in Fedora
# echo "[i] Disabling Samba"
# systemctl disable smbd
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.2.13 Ensure HTTP Proxy Server is not enabled
# HTTP Proxy Server isn't installed by default in Fedora
# echo "[i] Disabling HTTP Proxy Server"
# systemctl disable squid
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.2.14 Ensure SNMP Server is not enabled
# SNMP Server isn't installed by default in Fedora
# echo "[i] Disabling SNMP Server"
# systemctl disable snmpd
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.2.15 Ensure mail transfer agent is configured for local-only mode
# postfix isn't installed by default in Fedora
# echo "[i] Configuring mail transfer agent for local-only mode"
# if grep -q "^inet_interfaces = " /etc/postfix/main.cf; then
# sed -i 's/^inet_interfaces.*/inet_interface = loopback-only/' /etc/postfix/main.cf
# else
# echo "inet_interfaces = loopback-only" >> /etc/postfix/main.cf
# fi
# systemctl restart postfix
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.2.16 Ensure rsync service is not enabled
# rsync service isn't installed by default in Fedora
# echo "[i] Disabling rsync service"
# systemctl disable rsync
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.2.17 Ensure NIS Server is not enabled
# echo "[i] Disabling NIS Server"
# systemctl disable nis
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.3.1 Ensure NIS Client is not installed
echo "[i] Uninstalling NIS client"
yum remove -y nis
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.3.2 Ensure rsh client is not installed
echo "[i] Uninstalling the rsh client"
yum remove -y rsh-client rsh-redone-client
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.3.3 Ensure talk client is not installed
echo "[i] Uninstalling the talk client"
yum remove -y talk
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.3.4 Ensure telnet client is not installed
echo "[i] Uninstalling the telnet client"
yum remove -y telnet
#---------------------------------------------------------------------------------------------------------------------------------------#
# 2.3.5 Ensure LDAP client is not installed
echo "[i] Uninstalling the LDAP client"
yum remove -y ldap-utils
#---------------------------------------------------------------------------------------------------------------------------------------#
# 3.1.1 Ensure IP forwarding is disabled
# 3.1.2 Ensure packet redirect sending is disabled
# This are only required if the system is to act as a host only. If needed,
# run the 'workstation_cis_hardening_level1_scored_HOSTONLY.sh' script to apply these controls
#########################################################################################################################################
# 3.2.1 Ensure source routed packets are not accepted
echo "[i] Ensuring source routed packets are not accepted"
if grep -q "^net.ipv4.conf.all.accept_source_route" /etc/sysctl.conf; then
sed -i 's/^net.ipv4.conf.all.accept_source_route.*/net.ipv4.conf.all.accept_source_route = 0/' /etc/sysctl.conf
else
echo "net.ipv4.conf.all.accept_source_route = 0" >> /etc/sysctl.conf
fi
if grep -q "^net.ipv4.conf.default.accept_source_route" /etc/sysctl.conf; then
sed -i 's/^net.ipv4.conf.default.accept_source_route.*/net.ipv4.conf.default.accept_source_route = 0/' /etc/sysctl.conf
else
echo "net.ipv4.conf.default.accept_source_route = 0" >> /etc/sysctl.conf
fi
sysctl -w net.ipv4.conf.all.accept_source_route=0
sysctl -w net.ipv4.conf.default.accept_source_route=0
sysctl -w net.ipv4.route.flush=1
#---------------------------------------------------------------------------------------------------------------------------------------#
# 3.2.2 Ensure ICMP redirects are not accepted
echo "[i] Ensuring ICMP redirects are not accepted"
if grep -q "^net.ipv4.conf.all.accept_redirects" /etc/sysctl.conf; then
sed -i 's/^net.ipv4.conf.all.accept_redirects.*/net.ipv4.conf.all.accept_redirects = 0/' /etc/sysctl.conf
else
echo "net.ipv4.conf.all.accept_redirects = 0" >> /etc/sysctl.conf
fi
if grep -q "^net.ipv4.conf.default.accept_redirects" /etc/sysctl.conf; then
sed -i 's/^net.ipv4.conf.default.accept_redirects.*/net.ipv4.conf.default.accept_redirects = 0/' /etc/sysctl.conf
else
echo "net.ipv4.conf.default.accept_redirects = 0" >> /etc/sysctl.conf
fi
sysctl -w net.ipv4.conf.all.accept_redirects=0
sysctl -w net.ipv4.conf.default.accept_redirects=0
sysctl -w net.ipv4.route.flush=1
#---------------------------------------------------------------------------------------------------------------------------------------#
# 3.2.3 Ensure secure ICMP redirects are not accepted
echo "[i] Ensuring secure ICMP redirects are not accepted"
if grep -q "^net.ipv4.conf.all.secure_redirects" /etc/sysctl.conf; then
sed -i 's/^net.ipv4.conf.all.secure_redirects.*/net.ipv4.conf.all.secure_redirects = 0/' /etc/sysctl.conf
else
echo "net.ipv4.conf.all.secure_redirects = 0" >> /etc/sysctl.conf
fi
if grep -q "^net.ipv4.conf.default.secure_redirects" /etc/sysctl.conf; then
sed -i 's/^net.ipv4.conf.default.secure_redirects.*/net.ipv4.conf.default.secure_redirects = 0/' /etc/sysctl.conf
else
echo "net.ipv4.conf.default.secure_redirects = 0" >> /etc/sysctl.conf
fi
sysctl -w net.ipv4.conf.all.secure_redirects=0
sysctl -w net.ipv4.conf.default.secure_redirects=0
sysctl -w net.ipv4.route.flush=1
#---------------------------------------------------------------------------------------------------------------------------------------#
# 3.2.4 Ensure suspicious packets are logged
echo "[i] Ensuring suspicious packets are logged"
if grep -q "^net.ipv4.conf.all.log_martians" /etc/sysctl.conf; then
sed -i 's/^net.ipv4.conf.all.log_martians.*/net.ipv4.conf.all.log_martians = 1/' /etc/sysctl.conf
else
echo "net.ipv4.conf.all.log_martians = 1" >> /etc/sysctl.conf
fi
if grep -q "^net.ipv4.conf.default.log_martians" /etc/sysctl.conf; then
sed -i 's/^net.ipv4.conf.default.log_martians.*/net.ipv4.conf.default.log_martians = 1/' /etc/sysctl.conf
else
echo "net.ipv4.conf.default.log_martians = 1" >> /etc/sysctl.conf
fi
sysctl -w net.ipv4.conf.all.log_martians=1
sysctl -w net.ipv4.conf.default.log_martians=1
sysctl -w net.ipv4.route.flush=1
#---------------------------------------------------------------------------------------------------------------------------------------#
# 3.2.5 Ensure broadcast ICMP requests are ignored
echo "[i] Ensuring broadcast ICMP requests are ignored"
if grep -q "^net.ipv4.icmp_echo_ignore_broadcasts" /etc/sysctl.conf; then
sed -i 's/^net.ipv4.icmp_echo_ignore_broadcasts.*/net.ipv4.icmp_echo_ignore_broadcasts = 1/' /etc/sysctl.conf
else
echo "net.ipv4.icmp_echo_ignore_broadcasts = 1" >> /etc/sysctl.conf
fi
sysctl -w net.ipv4.icmp_echo_ignore_broadcasts=1
sysctl -w net.ipv4.route.flush=1
#---------------------------------------------------------------------------------------------------------------------------------------#
# 3.2.6 Ensure bogus ICMP responses are ignored
echo "[i] Ensuring bogus ICMP responses are ignored"
if grep -q "^net.ipv4.icmp_ignore_bogus_error_responses" /etc/sysctl.conf; then
sed -i 's/^net.ipv4.icmp_ignore_bogus_error_responses.*/net.ipv4.icmp_ignore_bogus_error_responses = 1/' /etc/sysctl.conf
else
echo "net.ipv4.icmp_ignore_bogus_error_responses = 1" >> /etc/sysctl.conf
fi
sysctl -w net.ipv4.icmp_ignore_bogus_error_responses=1
sysctl -w net.ipv4.route.flush=1
#---------------------------------------------------------------------------------------------------------------------------------------#
# 3.2.7 Ensure Reverse Path Filtering is enabled
echo "[i] Ensuring Reverse Path Filtering is enabled"
if grep -q "^net.ipv4.conf.all.rp_filter" /etc/sysctl.conf; then
sed -i 's/^net.ipv4.conf.all.rp_filter.*/net.ipv4.conf.all.rp_filter = 1/' /etc/sysctl.conf
else
echo "net.ipv4.conf.all.rp_filter = 1" >> /etc/sysctl.conf
fi
if grep -q "^net.ipv4.conf.default.rp_filter" /etc/sysctl.conf; then
sed -i 's/^net.ipv4.conf.default.rp_filter.*/net.ipv4.conf.default.rp_filter = 1/' /etc/sysctl.conf
else
echo "net.ipv4.conf.default.rp_filter = 1" >> /etc/sysctl.conf
fi
sysctl -w net.ipv4.conf.all.rp_filter=1
sysctl -w net.ipv4.conf.default.rp_filter=1
sysctl -w net.ipv4.route.flush=1
#---------------------------------------------------------------------------------------------------------------------------------------#
# 3.2.8 Ensure TCP SYN Cookies is enabled
echo "[i] Ensuring TCP SYN Cookies is enabled"
if grep -q "^net.ipv4.tcp_syncookies" /etc/sysctl.conf; then
sed -i 's/^net.ipv4.tcp_syncookies.*/net.ipv4.tcp_syncookies = 1/' /etc/sysctl.conf
else
echo "net.ipv4.tcp_syncookies = 1" >> /etc/sysctl.conf
fi
sysctl -w net.ipv4.tcp_syncookies=1
sysctl -w net.ipv4.route.flush=1
#########################################################################################################################################
# 3.4.1 Ensure TCP Wrappers is installed
echo "[i] Installing TCP Wrappers"
yum install -y tcp_wrappers
#---------------------------------------------------------------------------------------------------------------------------------------#
# 3.4.2 Ensure /etc/hosts.allow is configured
# This control is dependent on the individual organisation so will need to be set manually
# By default, nothing is in the hosts.allow so when we generate the hosts.deny in the next section, no IP addresses with be permitted to connect with the host
echo "[i] Creating a default hosts.allow file"
echo "ALL: 192.168.0.0/255.255.0.0" > /etc/hosts.allow
#---------------------------------------------------------------------------------------------------------------------------------------#
# 3.4.3 Ensure /etc/hosts.deny is configured
echo "[i] The hosts.deny file is being created with a default 'deny all' rule"
echo "ALL: ALL" >> /etc/hosts.deny
#---------------------------------------------------------------------------------------------------------------------------------------#
# 3.4.4 Ensure permissions on /etc/hosts.allow are configured
echo "[i] Setting the correct permissions for the 'hosts.allow' file"
chown root:root /etc/hosts.allow
chmod 644 /etc/hosts.allow
#---------------------------------------------------------------------------------------------------------------------------------------#
# 3.4.4 Ensure permissions on /etc/hosts.deny are configured
echo "[i] Setting the correct permissions for the 'hosts.deny' file"
chown root:root /etc/hosts.deny
chmod 644 /etc/hosts.deny
#---------------------------------------------------------------------------------------------------------------------------------------#
# 3.6.1 Ensure iptables is installed
# 3.6.2 Ensure default deny firewall policy
# 3.6.3 Ensure loopback traffic is configured
# 3.6.5 Ensure firewall rules exist for all open ports
echo "[i] Installing iptables"
yum install -y iptables
echo "[i] Flushing iptable rules"
iptables -F
echo "[i] Adding default deny firewall policy"
iptables -P INPUT DROP
iptables -P OUTPUT DROP
iptables -P FORWARD DROP
echo "[i] Configuring loopback traffic rules within firewall policy"
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
echo "[i] Opening inbound ssh (tcp port 22) connections within the firewall policy"
iptables -A INPUT -p tcp --dport 22 -m state --state NEW -j ACCEPT
echo "[i] All additional rules will need to be added manually if required"
#########################################################################################################################################
# 4.2.1.1 Ensure rsyslog Service is enabled
# 4.2.3 Ensure rsyslog or syslog-ng is installed
yum install -y rsyslog
yum install -y syslog-ng
echo "[i] Enabling rsyslog service"
systemctl enable rsyslog
# 4.2.1.3 Ensure rsyslog default file permissions configured
echo "[i] Configuring rsyslog default file permissions"
if grep -q "^$FileCreateMode" /etc/sysctl.conf; then
sed -i 's/^$FileCreateMode.*/$FileCreateMode 0640/' /etc/sysctl.conf
else
echo "$FileCreateMode 0640" >> /etc/sysctl.conf
fi
#---------------------------------------------------------------------------------------------------------------------------------------#
# 4.2.1.4 Ensure rsyslog is configured to send logs to a remote log host server
# This requires the system administrator to manually add the url of a log host
# As these are non-networked standalone machines, a remote logging server isn't needed
#---------------------------------------------------------------------------------------------------------------------------------------#
# 4.2.2.1 Ensure syslog-ng service is enabled
echo "[i] Enabling syslog-ng service"
systemctl enable syslog-ng
#---------------------------------------------------------------------------------------------------------------------------------------#
# 4.2.2.3 Ensure syslog-ng default file permissions configured
echo "[i] Configuring the syslog-ng default file permissions"
if grep -q "^options {" /etc/syslog-ng/syslog-ng.conf; then
sed -i 's/^options {.*/options { chain_hostnames(off); flush_lines(0); perm(0640); stats_freq(3600); threaded(yes); };/' /etc/syslog-ng/syslog-ng.conf
else
echo "options { chain_hostnames(off); flush_lines(0); perm(0640); stats_freq(3600); threaded(yes); };" >> /etc/syslog-ng/syslog-ng.conf
fi
#---------------------------------------------------------------------------------------------------------------------------------------#
# 4.2.3 Ensure rsyslog or syslog-ng is installed
# The installation was already carried out during the '4.2.1.1' control above
#---------------------------------------------------------------------------------------------------------------------------------------#
# 4.2.4 Ensure permissions on all logfiles are configured
echo "[i] Setting correct permissions on all log files"
find /var/log -type f -exec chmod g-wx,o-rwx {} +
#########################################################################################################################################
# 5.1.1 Ensure cron daemon is enabled
echo "[i] Enabling the cron daemon"
systemctl enable cron
#---------------------------------------------------------------------------------------------------------------------------------------#
# 5.1.2 Ensure permissions on /etc/crontab are configured
echo "[i] Setting the correct permissions on /etc/crontab"
chown root:root /etc/crontab
chmod og-rwx /etc/crontab
#---------------------------------------------------------------------------------------------------------------------------------------#
# 5.1.3 Ensure permissions on /etc/cron.hourly are configured
echo "[i] Setting the correct permissions on /etc/cron.hourly"
chown root:root /etc/cron.hourly
chmod og-rwx /etc/cron.hourly
#---------------------------------------------------------------------------------------------------------------------------------------#
# 5.1.4 Ensure permissions on /etc/cron.daily are configured
echo "[i] Setting the correct permissions on /etc/cron.daily"
chown root:root /etc/cron.daily
chmod og-rwx /etc/cron.daily
#---------------------------------------------------------------------------------------------------------------------------------------#
# 5.1.5 Ensure permissions on /etc/cron.weekly are configured
echo "[i] Setting the correct permissions on /etc/cron.weekly"
chown root:root /etc/cron.weekly
chmod og-rwx /etc/cron.weekly
#---------------------------------------------------------------------------------------------------------------------------------------#
# 5.1.6 Ensure permissions on /etc/cron.monthly are configured
echo "[i] Setting the correct permissions on /etc/cron.monthly"
chown root:root /etc/cron.monthly
chmod og-rwx /etc/cron.monthly
#---------------------------------------------------------------------------------------------------------------------------------------#
# 5.1.7 Ensure permissions on /etc/cron.d are configured
echo "[i] Setting the correct permissions on /etc/cron.d"
chown root:root /etc/cron.d
chmod og-rwx /etc/cron.d
#---------------------------------------------------------------------------------------------------------------------------------------#
# 5.1.8 Ensure at/cron is restricted to authorized users
echo "[i] Restricting at/cron to authorised users"
rm /etc/cron.deny
rm /etc/at.deny
touch /etc/cron.allow
touch /etc/at.allow
chmod og-rwx /etc/cron.allow