Linux Hardening script
Here i am providing a detailed script for linux hardening which can be used for RHEL/CentOS 5.x systems. You can enable and disable services as per your project/system requirement . A detailed read me is given below for your better understanding
****************************Linux Hardening Read Me********************
1.copy the script given below to a folder called linuxhardening and copy that to /tmp in server
2. Download and copy below mentioned rpms to the linuxhardening folder
* aide-0.13.1-8.el5.i386.rpm
*rsyslog-3.22.1-7.el5.i386.rpm
2. Download and copy below mentioned rpms to the linuxhardening folder
* aide-0.13.1-8.el5.i386.rpm
*rsyslog-3.22.1-7.el5.i386.rpm
3. unzip the linuxhardening.zip
4. give the execute prrmission to linux_updated.sh
5. Execute the script as root
6. Create an alternate user when the script prompts you
7. cross check the report "linuxreport.txt" which is avilable in /tmp after completion of the script.
******************************************************************************
Script is starting from here
#!/bin/bash
#############Linux HardeningScript#####################################
# #
##############Author:Ratheesh Vasudevan###############################
###configuring services###
chkconfig autofs on
chkconfig acpid off
chkconfig anacron off
chkconfig apmd off
chkconfig arptables_jf off
chkconfig arpwatch off
chkconfig atd off
chkconfig avahi-daemon on
chkconfig auditd on
chkconfig autofs on
chkconfig avahi-dnsconfd off
chkconfig bluetooth off
chkconfig conman off
chkconfig cups off
chkconfig cpuspeed on
chkconfig crond on
chkconfig cyrus-imapd off
chkconfig dc_client off
chkconfig dc_server off
chkconfig firstboot off
chkconfig dovecot off
chkconfig dund off
chkconfig haldaemon off
chkconfig hidd off
chkconfig hplip off
chkconfig isdn off
chkconfig iptables off
chkconfig ip6tables off
chkconfig irda off
chkconfig irqbalance on
chkconfig iscsi on
chkconfig iscsid on
chkconfig kdump off
chkconfig kudzu off
chkconfig krb524 off
chkconfig kprop off
chkconfig mcstrans off
chkconfig mailman off
chkconfig mcstrains off
chkconfig microcode_ctl off
chkconfig multipathd off
chkconfig netconsole off
chkconfig netfs on
chkconfig netplugd off
chkconfig nfs on
chkconfig nfslock on
chkconfig ntpd on
chkconfig nscd off
chkconfig pcscd off
chkconfig portmap on
chkconfig rdisc off
chkconfig rhnsd off
chkconfig restorecond on
chkconfig rpcgssd off
chkconfig rpcidmapd off
chkconfig ripd off
chkconfig ripngd off
chkconfig rpcsvcgssd off
chkconfig sendmail off
chkconfig smartd off
chkconfig snmpd on
chkconfig setroubleshoot off
chkconfig sshd on
chkconfig syslog on
chkconfig sysstat on
chkconfig winbind off
chkconfig wpa_supplicant off
chkconfig xfs off
chkconfig ypbind off
chkconfig yum-updatesd off
chkconfig acpid on
chkconfig anacron on
chkconfig atd on
chkconfig cpuspeed on
chkconfig lvm2-monitor on
chkconfig messagebus on
chkconfig ntpd on
chkconfig network on
chkconfig readahead_early off
chkconfig readahead_later off
chkconfig syslog on
chkconfig sshd on
chkconfig vncserver on
chkconfig xend off
chkconfig xfs off
chkconfig zebra off
chkconfig chargen-dgram off
chkconfig chargen-stream off
chkconfig daytime-dgram off
chkconfig daytime-stream off
chkconfig echo-dgram off
chkconfig echo-stream off
chkconfig tcpmux-server off
echo "3.1-Configured necessory services in startup" >> /tmp/linuxreport.txt
########Backing up important files#######################
mkdir /linux_bkp
cp -a /etc/pam.d/system-auth /linux_bkp/system_auth_bkp
cp -a /etc/grub.conf /linux_bkp/grub.conf_bkp
cp -a /etc/inittab /linux_bkp/inittab_bkp
cp -a /etc/sysctl.conf /linux_bkp/sysctl.conf_bkp
cp -a /etc/sysconfig/init /linux_bkp/init_bkp
cp -a /etc/sysconfig/prelink /linux_bkp/prelink_bkp
cp -a /etc/security/limits.conf /linux_bkp/limits.conf_bkp
cp -a /etc/syslog.conf /linux_bkp/syslog.conf_bkp
cp -a /etc/audit/audit.conf /linux_bkp/auditd.conf_bkp
cp -a /etc/audit/audit.rules /linux_bkp/audit.rules_bkp
cp -a /etc/ssh/sshd_config /linux_bkp/sshd_config_bkp
cp -a /etc/login.defs /linux_bkp/login.defs_bkp
echo "Important Files are backedup" >> /tmp/linuxreport.txt
#Adding NODEV in /dev/shm partition
nodev_chk1=`cat /etc/fstab |grep /dev/shm |grep nodev | wc -l`
nodev_chk2=`mount |grep /dev/shm |grep nodev |wc -l`
if [ $nodev_chk1 -gt 0 ] || [ $nodev_chk2 -gt 0 ]; then
mount -o remount,nodev,noexec,nosuid /dev/shm
echo "3.2.1-NODEV is added in /dev/shm " >> /tmp/linuxreport.txt
else
echo "3.2.1-/dev/shm is already mounted with nodev" >> /tmp/linuxreport.txt
fi
#Adding nosuid in /dev/shm partition
nosuid_chk1=`cat /etc/fstab |grep /dev/shm |grep nosuid | wc -l`
nosuid_chk2=`mount |grep /dev/shm |grep nosuid | wc -l`
if [ $nosuid_chk1 -gt 0 ] || [ $nosuid_chk2 -gt 0 ]; then
mount -o remount,nodev,noexec,nosuid /dev/shm
echo "3.2.2-nosuid is added in /dev/shm" >> /tmp/linuxreport.txt
else
echo "3.2.2-/dev/shm is already mounted with nosuid" >> /tmp/linuxreport.txt
fi
#Adding noexec in /dev/shm partition
noexec_chk1=`cat /etc/fstab |grep /dev/shm |grep noexec | wc -l`
noexec_chk2=`mount |grep /dev/shm |grep noexec | wc -l`
if [ $noexec_chk1 -gt 0 ] || [ $noexec_chk2 -gt 0 ]; then
mount -o remount,nodev,noexec,nosuid /dev/shm
echo "3.2.3-noexec is added in /dev/shm" >> /tmp/linuxreport.txt
else
echo "3.2.3-/dev/shm is already mounted with noexec" >> /tmp/linuxreport.txt
fi
#Install AIDE
rpm -qa |grep aide
if [ $? -eq 1 ]; then
cd /tmp/linuxhardening
rpm -ivh aide*.rpm --nodeps
echo "3.4.1-AIDE is installed succesfully" >> /tmp/linuxreport.txt
else
echo "3.4.1-AIDE is already installed" >> /tmp/linuxreport.txt
fi
#3.4.2-Periodic Execution of File integrity
crontab -l |grep aide
if [ $? -eq 1 ]; then
crontab -l > mycron
echo "0 1 * * * /usr/sbin/aide -check" >> mycron
crontab mycron
echo "3.4.2- Periodic execution of file inegrity is configured" >> /tmp/linuxreport.txt
fi
#3.6.1-Set user and group owner for grub.conf
chown root:root /etc/grub.conf
echo "3.6.1-user and owner configuration is done for /etc/grub.conf" >> /tmp/linuxreport.txt
#3.6.2-Set permission on /etc/groub.conf
chmod og-rwx /etc/grub.conf
echo "3.6.2-permission is setted for /etc/grub.conf" >> /tmp/linuxreport.txt
#3.6.4-Set authentication for single user mode
echo ~:S:wait:/sbin/sulogin >> /etc/inittab
if [ $? -eq 0 ]; then
echo "3.6.4-authentication is configured successfully for single user mode" >> /tmp/linuxreport.txt
else
echo "3.6.4-Failed to configure authentication in single user mode" >> /tmp/linuxreport.txt
fi
#3.6.5-Disable interactive boot
grep "PROMPT=no" /etc/sysconfig/init
if [ $? -eq 1 ]; then
echo "3.6.5-Disabling interactive boot" >> /tmp/linuxreport.txt
sed -i 's/PROMPT=yes/PROMPT=no/g' /etc/sysconfig/init
else
echo "3.6.5-Interactive boot is already enabled"
fi
#3.7.1 Restrict Core Dumps
echo * hard core 0 >> /etc/security/limits.conf
echo fs.suid.dumpable = 0 >> /etc/sysctl.conf
echo "3.7.1-core dump is restricted" >> /tmp/linuxreport.txt
#3.7.2 Configure ExecShield
echo kernel.exec-shield = 1 >> /etc/sysctl.conf
echo "3.7.2-Execshield is configured" >> /tmp/linuxreport.txt
#3.7.5 Disable Prelink
sed -i 's/PRELINKING=yes/PRELINKING=no/g' /etc/sysconfig/prelink
echo "3.7.5-Prelinking is disabled" >> /tmp/linuxreport.txt
#3.8.1 Remove telnet server
tntsrv=`rpm -qa |grep telnet-server`
if [ $? -eq 0 ]; then
rpm -e $tntsev
echo "3.8.1-telnet-server is removed" >> /tmp/linuxreport.txt
else
echo "3.8.1-telnet-server is not installed" >> /tmp/linuxreport.txt
fi
#3.8.3 Remove RSH server
rsh=`rpm -qa |grep rsh-server`
if [ $? -eq 0 ]; then
rpm -e $rsh
echo "3.8.3-rsh-server is removed" >> /tmp/linuxreport.txt
else
echo "3.8.3-rsh-server is not installed" >> /tmp/linuxreport.txt
fi
#3.8.4 Remove NIS client
ypb=`rpm -qa |grep ypbind`
if [ $? -eq 0 ]; then
rpm -e $ypb --nodeps
echo "3.8.4-NIS client is removed" >> /tmp/linuxreport.txt
else
echo "3.8.4-NIS client is not installed" >> /tmp/linuxreport.txt
fi
#3.8.5 Remove NIS server
yps=`rpm -qa |grep ypserv`
if [ $? -eq 0 ]; then
rpm -e $yps
echo "3.8.5-NIS server is removed" >> /tmp/linuxreport.txt
else
echo "3.8.5-NIS server is not installed" >> /tmp/linuxreport.txt
fi
#3.8.6 Remove TFTP
tfp=`rpm -qa |grep tftp`
if [ $? -eq 0 ]; then
rpm -e $tfp
echo "3.8.6-tftp server is removed" >> /tmp/linuxreport.txt
else
echo "3.8.6-tftp server is not installed" >> /tmp/linuxreport.txt
fi
#3.8.8 Remove Talk
tlk=`rpm -qa |grep talk`
if [ $? -eq 0 ]; then
rpm -e $tlk
echo "3.8.8-talk is removed" >> /tmp/linuxreport.txt
else
echo "3.8.8-talk is not installed" >> /tmp/linuxreport.txt
fi
#3.8.9 Remove talk-server
tlks=`rpm -qa |grep talk-server`
if [ $? -eq 0 ]; then
rpm -e $tlks
echo "3.8.9-talk server is removed" >> /tmp/linuxreport.txt
else
echo "3.8.9-talk server is not installed" >> /tmp/linuxreport.txt
fi
######3.9#####Secure OS services###################
#3.9.2 Disable print server CUPS
chkconfig cups off
if [ $? -eq 0 ]; then
echo "3.9.2-cups is disabled for this system" >> /tmp/linuxreport.txt
else
echo "3.9.2-cups is not installed" >> /tmp/linuxreport.txt
fi
#3.9.8 Remove Davecot
rpm -qa |grep davecot
if [ $? -eq 0 ]; then
rpm -e davecot*.rpm --nodeps
echo "3.9.8-davecot is removed" >> /tmp/linuxreport.txt
else
echo "3.9.8-davecot is not installed" >> /tmp/linuxreport.txt
fi
#3.9.9 Remove Samba
$smb=`rpm -qa |grep samba |grep -v samba-client`
if [ $? -eq 0 ]; then
rpm -e $smb --nodeps
echo "3.9.9-samba server is removed" >> /tmp/linuxreport.txt
else
echo "3.9.9-samba server is not installed" >> /tmp/linuxreport.txt
fi
######3.10########## Secure Network configuration
#3.10.2 Disable Send packet redirects
/sbin/sysctl net.ipv4.conf.all.send_redirects |grep 1
if [ $? -eq 0 ]; then
/sbin/sysctl -w net.ipv4.conf.all.send_redirects=0
/sbin/sysctl -w net.ipv4.conf.send_redirects =0
echo "3.10.2-Disabling send packet redirects is configured" >> /tmp/linuxreport.txt
else
echo "3.10.2-Disabling send packet redirects is failed" >> /tmp/linuxreport.txt
fi
#3.10.6 Log Suspicious packets
/sbin/sysctl net.ipv4.conf.all.log_martians |grep 0
if [ $? -eq 0 ]; then
/sbin/sysctl -w net.ipv4.conf.all.log_martians=1
/sbin/sysctl -w net.ipv4.route.flush=1
echo "3.10.6-Logging un-routable packets are configured" >> /tmp/linuxreport.txt
else
echo "3.10.6-Logging un-routable packets configuration is failed" >> /tmp/linuxreport.txt
fi
#3.10.8 Enable bad error Message protection
/sbin/sysctl net.ipv4.icmp_ignore_bogus_error_responses |grep 1
if [ $? -eq 1 ]; then
/sbin/sysctl -w net.ipv4.icmp_ignore_bogus_error_responses=1
/sbin/sysctl -w net.ipv4.route.flush=1
echo "3.10.8-Bad error Message Protection is configured" >> /tmp/linuxreport.txt
else
echo "3.10.8-Bad error Message Protection is configuration is failed" >> /tmp/linuxreport.txt
fi
#3.10.9 Enable TCP SYN Cookies
/sbin/sysctl net.ipv4.tcp_syncookies |grep 0
if [ $? -eq 1 ]; then
/sbin/sysctl -w net.ipv4.tcp_syncookies=1
/sbin/sysctl -w net.ipv4.route.flush=1
echo "3.10.9-TCP SYN Cookies are congigured successfully" >> /tmp/linuxreport.txt
else
echo "3.10.9-TCP SYN Cookies are congiguration is failed" >> /tmp/linuxreport.txt
fi
#3.10.10 Disable IPv6
grep ipv6 /etc/modprobe.conf
if [ $? -eq 1 ]; then
echo options ipv6 "disable=1" >> /etc/modprobe.conf
echo "3.10.10-IPv6 is disabled sucessfully" >> /tmp/linuxreport.txt
else
echo "3.10.10-IPv6 is not installed" >> /tmp/linuxreport.txt
fi
####3.11 Secure Logging and Auditing functions##############################################
#3.11.1 Configure /etc/syslog.conf
echo auth,user.* /var/log/messages >> /etc/syslog.conf
echo kern.* /var/log/kern.log >> /etc/syslog.conf
echo daemon.* /var/log/daemon.log >> /etc/syslog.conf
echo syslog.* /var/log/syslog >> /etc/syslog.conf
echo news,uucp,local0,local1,local2,local3,local4,local5,local6.* /var/log/unused.log >> /etc/syslog.conf
pkill -HUP syslogd
if [ $? -eq 0 ]; then
echo "3.11.1-syslog.conf is configured successfully" >> /tmp/linuxreport.txt
else
echo "3.11.1-syslog.conf is configuration is failed" >> /tmp/linuxreport.txt
fi
#3.11.2 Create and Set Permissions on syslog Log Files
cd /var/log
for LOG in \
messages kern.log daemon.log syslog \
do
chown -R root:root /var/log/$LOG
chmod og-rwx /var/log/$LOG
echo " 3.11.2-Permissions are set for syslog files" >> /tmp/linuxreport.txt
done
#3.11.5 Install the rsyslog package
rpm -qa |grep rsyslog
if [ $? -eq 1 ]; then
cd /tmp/linuxhardening
rpm -ivh rsyslog*.rpm --nodeps
echo "3.11.5-rsyslog is configured" >> /tmp/linuxreport.txt
else
echo "3.11.5-rsyslog is already installed" >> /tmp/linuxreport.txt
fi
#3.11.6 Activate the rsyslog Service
chkconfig syslog off
chkconfig rsyslog on
echo " 3.11.6-rsyslog service is activated successfully" >> /tmp/linuxreport.txt
#3.11.7 configure /etc/rsyslog.conf
echo auth,user.* /var/log/messages >> /etc/rsyslog.conf
echo kern.* /var/log/kern.log >> /etc/rsyslog.conf
echo daemon.* /var/log/daemon.log >> /etc/rsyslog.conf
echo syslog.* /var/log/syslog >> /etc/rsyslog.conf
echo news,uucp,local0,local1,local2,local3,local4,local5,local6.* /var/log/unused.log >> /etc/rsyslog.conf
pkill -HUP rsyslogd
if [ $? -eq 0 ]; then
echo "3.11.7-rsyslog is configured successfully" >> /tmp/linuxreport.txt
else
echo "3.11.7-rsyslog is configuration is failed" >> /tmp/linuxreport.txt
fi
#3.11.8 Create and Set Permissions on rsyslog Log Files
cd /var/log
for LOG in \
messages kern.log daemon.log syslog \
do
chown -R root:root /var/log/$LOG
chmod og-rwx /var/log/$LOG
echo " 3.11.8-Permissions are set for rsyslog files" >> /tmp/linuxreport.txt
done
#3.11.10 Enable auditd Service
chkconfig auditd on
if [ $? -eq 0 ]; then
echo "3.11.10 auditd service is enabled" >> /tmp/linuxreport.txt
else "3.11.10-enabling audit service is failed, please check audit service is installed or not" >> /tmp/linuxreport.txt
fi
#3.11.11 Configure Audit Log Storage Size
sed -i 's/max_log_file = 5/#max_log_file = 5/g' /etc/audit/auditd.conf
echo max_log_file = MB >> /etc/audit/auditd.conf
if [ $? -eq 0 ]; then
echo "3.11.11 Configure Audit Log Storage Size is successful" >> /tmp/linuxreport.txt
else
echo "3.11.11 Configure Audit Log Storage Size is failed" >> /tmp/linuxreport.txt
fi
#3.11.12 Keep All Auditing Information
echo max_log_file_action = keep_logs >> /etc/audit/auditd.conf
if [ $? -eq 0 ]; then
echo "3.11.12 Configure Audit Log is successful" >> /tmp/linuxreport.txt
else
echo "3.11.12 Configure Audit Log is failed" >> /tmp/linuxreport.txt
fi
#3.11.14 Record Events That Modify Date and Time Information
os_arch=`getconf LONG_BIT`
if [ $os_arch -eq 32 ]; then
echo -a always,exit -F arch=b32 -S adjtimex -S settimeofday -S stime -k time-change >> /etc/audit/audit.rules
echo -a always,exit -F arch=b32 -S clock_settime -k time-change >> /etc/audit/audit.rules
echo -w /etc/localtime -p wa -k time-change >> /etc/audit/audit.rules
pkill -HUP auditd
echo "3.11.4-Configuration to record Events That Modify Date and Time Information updated successfully for 32bit OS" >> /tmp/linuxreport.txt
else
echo -a always,exit -F arch=b64 -S adjtimex -S settimeofday -k time-change >> /etc/audit/audit.rules
echo -a always,exit -F arch=b32 -S adjtimex -S settimeofday -S stime -k time-change >> /etc/audit/audit.rules
echo -a always,exit -F arch=b64 -S clock_settime -k time-change >> /etc/audit/audit.rules
echo -a always,exit -F arch=b32 -S clock_settime -k time-change >> /etc/audit/audit.rules
echo -w /etc/localtime -p wa -k time-change >> /etc/audit/audit.rules
pkill -HUP auditd
echo "3.11.4-Configuration to record Events That Modify Date and Time Information updated successfully for 64bit OS" >> /tmp/linuxreport.txt
fi
#3.11.15 Record Events That Modify User/Group Information
echo -w /etc/group -p wa -k identity >> /etc/audit/audit.rules
echo -w /etc/passwd -p wa -k identity >> /etc/audit/audit.rules
echo -w /etc/gshadow -p wa -k identity >> /etc/audit/audit.rules
echo -w /etc/shadow -p wa -k identity >> /etc/audit/audit.rules
echo -w /etc/security/opasswd -p wa -k identity >> /etc/audit/audit.rules
pkill -HUP auditd
echo "3.11.15-Configuration to record events that modify User/Group information in audit logs" >> /tmp/linuxreport.txt
#3.11.16 Record Events That Modify the System’s Network Environment
os_arch=`getconf LONG_BIT`
if [ $os_arch -eq 32 ]; then
echo -a exit,always -F arch=b32 -S sethostname -S setdomainname -k system-locale >> /etc/audit/audit.rules
echo -w /etc/issue -p wa -k system-locale >> /etc/audit/audit.rules
echo -w /etc/issue.net -p wa -k system-locale >> /etc/audit/audit.rules
echo -w /etc/hosts -p wa -k system-locale >> /etc/audit/audit.rules
echo -w /etc/sysconfig/network -p wa -k system-locale >> /etc/audit/audit.rules
pkill -HUP auditd
echo "3.11.16-Configuration to Record Events That Modify the System’s Network Environment is successfully configured for 32 bit OS" >> /tmp/linuxreport.txt
else
echo -a exit,always -F arch=b64 -S sethostname -S setdomainname -k system-locale >> /etc/audit/audit.rules
echo -a exit,always -F arch=b32 -S sethostname -S setdomainname -k system-locale >> /etc/audit/audit.rules
echo -w /etc/issue -p wa -k system-locale >> /etc/audit/audit.rules
echo -w /etc/issue.net -p wa -k system-locale >> /etc/audit/audit.rules
echo -w /etc/hosts -p wa -k system-locale >> /etc/audit/audit.rules
echo -w /etc/sysconfig/network -p wa -k system-locale >> /etc/audit/audit.rules
pkill -HUP auditd
echo "3.11.16-Configuration to Record Events That Modify the System’s Network Environment is successfully configured for 64 bit OS" >> /tmp/linuxreport.txt
fi
#3.11.17 Collect Login and Logout Events
echo -w /var/log/faillog -p wa -k logins >> /etc/audit/audit.rules
echo -w /var/log/lastlog -p wa -k logins >> /etc/audit/audit.rules
echo -w /var/log/tallylog -p -wa -k logins >> /etc/audit/audit.rules
echo -w /var/log/btmp -p wa -k session >> /etc/audit/audit.rules
pkill -HUP auditd
echo "3.11.17-Configuration to Collect Login and Logout Events is successfully configured in audit rules" >> /tmp/linuxreport.txt
#3.11.18 Collect Session Initiation Information
echo -w /var/run/utmp -p wa -k session >> /etc/audit/audit.rules
echo -w /var/log/wtmp -p wa -k session >> /etc/audit/audit.rules
pkill -HUP auditd
echo "3.11.18-Configuration to Collect Session Initiation Information is successfully configured in audit rules" >> /tmp/linuxreport.txt
#3.11.19 Collect Discretionary Access Control Permission Modification Events
os_arch=`getconf LONG_BIT`
if [ $os_arch -eq 32 ]; then
echo -a always,exit -F arch=b32 -S chmod -S fchmod -S fchmodat -F auid>=500 \ >> /etc/audit/audit.rules
echo -F auid!=4294967295 -k perm_mod >> /etc/audit/audit.rules
echo -a always,exit -F arch=b32 -S chown -S fchown -S fchownat -Slchown -F auid>=500 \ >> /etc/audit/audit.rules
echo -F auid!=4294967295 -k perm_mod >> /etc/audit/audit.rules
echo -a always,exit -F arch=b32 -S setxattr -S lsetxattr -S fsetxattr -S removexattr -S \ >> /etc/audit/audit.rules
echo lremovexattr -S fremovexattr -F auid>=500 -F auid!=4294967295 -k perm_mod >> /etc/audit/audit.rules
pkill -HUP auditd
echo "3.11.19-Configuration to Collect Discretionary Access Control Permission Modification Events is successfully updated in audit rules for 32 bit OS" >> /tmp/linuxreport.txt
else
echo -a always,exit -F arch=b64 -S chmod -S fchmod -S fchmodat -F auid>=500 \ >> /etc/audit/audit.rules
echo -F auid!=4294967295 -k perm_mod >> /etc/audit/audit.rules
echo -a always,exit -F arch=b32 -S chmod -S fchmod -S fchmodat -F auid>=500 \ >> /etc/audit/audit.rules
echo -F auid!=4294967295 -k perm_mod >> /etc/audit/audit.rules
echo -a always,exit -F arch=b64 -S chown -S fchown -S fchownat -S lchown -F auid>=500 >> /etc/audit/audit.rules
echo -F auid!=4294967295 -k perm_mod >> /etc/audit/audit.rules
echo -a always,exit -F arch=b32 -S chown -S fchown -S fchownat -S lchown -F auid>=500 \ >> /etc/audit/audit.rules
echo -F auid!=4294967295 -k perm_mod >> /etc/audit/audit.rules
echo -a always,exit -F arch=b64 -S setxattr -S lsetxattr -S fsetxattr -S removexattr -S \ >> /etc/audit/audit.rules
echo lremovexattr -S fremovexattr -F auid>=500 -F auid!=4294967295 -k perm_mod >> /etc/audit/audit.rules
echo -a always,exit -F arch=b32 -S setxattr -S lsetxattr -S fsetxattr -S removexattr -S \ >> /etc/audit/audit.rules
echo lremovexattr -S fremovexattr -F auid>=500 -F auid!=4294967295 -k perm_mod >> /etc/audit/audit.rules
pkill -HUP auditd
echo "3.11.19-Configuration to Collect Discretionary Access Control Permission Modification Events is successfully updated in audit rules for 64 bit OS" >> /tmp/linuxreport.txt
fi
#3.11.20 Collect Unsuccessful Unauthorized Access Attempts to Files
os_arch=`getconf LONG_BIT`
if [ $os_arch -eq 32 ]; then
echo -a always,exit -F arch=b32 -S creat -S open -S openat -S truncate -S ftruncate \ >> /etc/audit/audit.rules
echo -F exit=-EACCES -F auid>=500 -F auid!=4294967295 -k access >> /etc/audit/audit.rules
echo -a always,exit -F arch=b32 -S creat -S open -S openat -S truncate -S ftruncate \ >> /etc/audit/audit.rules
echo -F exit=-EPERM -F auid>=500 -F auid!=4294967295 -k access >> /etc/audit/audit.rules
pkill -HUP auditd
echo "3.11.20-Configuration to Collect Unsuccessful Unauthorized Access Attempts to Files is successfully updated in audit rules for 32 bit OS" >> /tmp/linuxreport.txt
else
echo -a always,exit -F arch=b64 -S creat -S open -S openat -S truncate -S ftruncate \ >> /etc/audit/audit.rules
echo -F exit=-EACCES -F auid>=500 -F auid!=4294967295 -k access >> /etc/audit/audit.rules
echo -a always,exit -F arch=b32 -S creat -S open -S openat -S truncate -S ftruncate \ >> /etc/audit/audit.rules
echo -F exit=-EACCES -F auid>=500 -F auid!=4294967295 -k access >> /etc/audit/audit.rules
echo -a always,exit -F arch=b64 -S creat -S open -S openat -S truncate -S ftruncate \ >> /etc/audit/audit.rules
echo -F exit=-EPERM -F auid>=500 -F auid!=4294967295 -k access >> /etc/audit/audit.rules
echo -a always,exit -F arch=b32 -S creat -S open -S openat -S truncate -S ftruncate \ >> /etc/audit/audit.rules
echo -F exit=-EPERM -F auid>=500 -F auid!=4294967295 -k access >> /etc/audit/audit.rules
pkill -HUP auditd
echo "3.11.20-Configuration to Collect Unsuccessful Unauthorized Access Attempts to Files is successfully updated in audit rules for 64 bit OS" >> /tmp/linuxreport.txt
fi
#3.11.22 Collect Successful File System Mounts
os_arch=`getconf LONG_BIT`
if [ $os_arch -eq 32 ]; then
echo -a always,exit -F arch=b32 -S mount -F auid>=500 -F auid!=4294967295 -k mounts >> /etc/audit/audit.rules
pkill -HUP auditd
echo "3.11.22-Configuration to Collect Successful File System Mounts is configured in audit rules for 32 bit OS" >> /tmp/linuxreport.txt
else
echo -a always,exit -F arch=b64 -S mount -F auid>=500 -F auid!=4294967295 -k mounts >> /etc/audit/audit.rules
echo -a always,exit -F arch=b32 -S mount -F auid>=500 -F auid!=4294967295 -k mounts >> /etc/audit/audit.rules
pkill -HUP auditd
echo "3.11.22-Configuration to Collect Successful File System Mounts is configured in audit rules for 64 bit OS" >> /tmp/linuxreport.txt
fi
#3.11.23 Collect File Deletion Events by User
os_arch=`getconf LONG_BIT`
if [ $os_arch -eq 32 ]; then
echo -a always,exit -F arch=b32 -S unlink -S unlinkat -S rename -S renameat -F auid>=500 \ >> /etc/audit/audit.rules
echo -F auid!=4294967295 -k delete >> /etc/audit/audit.rules
pkill -HUP auditd
echo "3.11.23-Configuration to Collect File Deletion Events by User is successfully configured in audit rules for 32 bit OS" >> /tmp/linuxreport.txt
else
echo -a always,exit -F arch=b64 -S unlink -S unlinkat -S rename -S renameat -F auid>=500 \ >> /etc/audit/audit.rules
echo -F auid!=4294967295 -k delete >> /etc/audit/audit.rules
echo -a always,exit -F arch=b32 -S unlink -S unlinkat -S rename -S renameat -F auid>=500 \ >> /etc/audit/audit.rules
echo -F auid!=4294967295 -k delete
pkill -HUP auditd
echo "3.11.23-Configuration to Collect File Deletion Events by User is successfully configured in audit rules for 64 bit OS" >> /tmp/linuxreport.txt
fi
#3.11.24 Collect Changes to System Administration Scope (sudoers)
echo -w /etc/sudoers -p wa -k scope >> /etc/audit/audit.rules
pkill -HUP auditd
echo "3.11.24-Configuration to Collect Changes to System Administration Scope (sudoers) in audit logs" >> /tmp/linuxreport.txt
#3.11.25Collect System Administrator Actions
echo -w /var/log/sudo.log -p wa -k actions >> /etc/audit/audit.rules
pkill -HUP auditd
echo "3.11.24-Configuration to collect System Administrator Actions in audit logs is configured" >> /tmp/linuxreport.txt
#3.11.26 Collect Kernel Module Loading and Unloading
echo -w /sbin/insmod -p x -k modules >> /etc/audit/audit.rules
echo -w /sbin/rmmod -p x -k modules >> /etc/audit/audit.rules
echo -w /sbin/modprobe -p x -k modules >> /etc/audit/audit.rules
echo -a always,exit -S init_module -S delete_module -k modules >> /etc/audit/audit.rules
pkill -HUP auditd
echo "3.11.26-Configuration to Collect Kernel Module Loading and Unloading in audit rules is configured" >> /tmp/linuxreport.txt
#3.11.27 Make the Audit Configuration Immutable
echo -e2 >> /etc/audit/audit.rules
echo "3.11.27-Audit configuration is made immutable" >> /tmp/linuxreport.txt
#3.11.28 Configure logrotate
ed /etc/logrotate.d/syslog << END
1d
0a
/var/log/messages /var/log/secure /var/log/maillog
/var/log/spooler /var/log/boot.log /var/log/cron {
.
w
q
END
echo "3.11.28-Logrotate for syslog is configured succesfully" >> /tmp/linuxreport.txt
####3.12 Secure System Access, Authentication & Authorization#######
#3.12.1 Enable cron Daemon
chkconfig cron on
if [ $? -eq 0 ]; then
echo "3.12.1-Cron daemon is enabled" >> /tmp/linuxreport.txt
else
echo "3.12.1-Enabling cron daemon is failed" >> /tmp/linuxreport.txt
fi
#3.12.2 Set User/Group Owner and Permission on /etc/crontab
chown root:root /etc/crontab
chmod og-rwx /etc/crontab
stat -c "%a %u %g" /etc/crontab | egrep ".00 0 0"
if [ $? -eq 0 ]; then
echo "3.12.2-User and Owner permission is configured for /etc/crontab" >> /tmp/linuxreport.txt
else
echo "3.12.2-User and Owner permission for /etc/crontab is failed" >> /tmp/linuxreport.txt
fi
#3.12.3 Set User/Group Owner and Permission on /etc/cron.hourly
chown root:root /etc/cron.hourly
chmod og-rwx /etc/cron.hourly
stat -c "%a %u %g" /etc/cron.hourly | egrep ".00 0 0"
if [ $? -eq 0 ]; then
echo "3.12.3-User and Owner permission is configured for /etc/cron.hourly" >> /tmp/linuxreport.txt
else
echo "3.12.3-User and Owner permission is failed for /etc/cron.hourly" >> /tmp/linuxreport.txt
fi
#3.12.5 Set User/Group Owner and Permission on /etc/cron.daily
chown root:root /etc/cron.daily
chmod og-rwx /etc/cron.daily
stat -c "%a %u %g" /etc/cron.daily | egrep ".00 0 0"
if [ $? -eq 0 ]; then
echo "3.12.5-User and Owner permission is configured for /etc/cron.daily" >> /tmp/linuxreport.txt
else "3.12.5-User and Owner permission is failed for /etc/cron.daily" >> /tmp/linuxreport.txt
fi
#3.12.6 Set User/Group Owner and Permission on /etc/cron.weekly
chown root:root /etc/cron.weekly
chmod og-rwx /etc/cron.weekly
stat -c "%a %u %g" /etc/cron.weekly | egrep ".00 0 0"
if [ $? -eq 0 ]; then
echo "3.12.6-User and Owner permission is configured for /etc/cron.weekly" >> /tmp/linuxreport.txt
fi
#3.12.7 Set User/Group Owner and Permission on /etc/cron.monthly
chown root:root /etc/cron.monthly
chmod og-rwx /etc/cron.monthly
stat -c "%a %u %g" /etc/cron.monthly | egrep ".00 0 0"
if [ $? -eq 0 ]; then
echo "3.12.7-User and Owner permission is configured for /etc/cron.monthly" >> /tmp/linuxreport.txt
fi
#3.12.8 Set User/Group Owner and Permission on /etc/cron.d
chown root:root /etc/cron.d
chmod og-rwx /etc/cron.d
stat -c "%a %u %g" /etc/cron.d | egrep ".00 0 0"
if [ $? -eq 0 ]; then
echo "3.122.8-User and Owner permission is configured for /etc/cron.d" >> /tmp/linuxreport.txt
fi
#3.12.10 Set SSH Protocol to 2
ssh_prot=`cat /etc/ssh/sshd_config |grep "#Protocol" |awk -F "," '{print $2}'`
if [ $ssh_prot -eq 1 ]; then
sed -i 's/#Protocol 2,1/Protocol 2/g' /etc/ssh/sshd_config
echo "3.12.10-ssh protocol2 is succesfully configured for this system" >> /tmp/linuxreport.txt
else
sed -i 's/Protocol 2,1/Protocol 2/g' /etc/ssh/sshd_config
echo "3.12.10-ssh protocol is changed from 2,1 to 2" >> /tmp/linuxreport.txt
fi
#3.12.11 Set LogLevel to VERBOSE
sed -i 's/#LogLevel INFO /LogLevel VERBOSE/g' /etc/ssh/sshd_config
echo "3.12.11-ssh LogLevel to VERBOSE is successfully configured" >> /tmp/linuxreport.txt
#3.12.11 Set Permissions on /etc/sshd_config
chown root:root /etc/ssh/sshd_config
chmod 644 /etc/ssh/sshd_config
stat -c "%a %u %g" /etc/ssh/sshd_config | egrep ".00 0 0"
if [ $? -eq 0 ]; then
echo "3.12.11-User and Owner permission is configured for /etc/ssh/sshd_config" >> /tmp/linuxreport.txt
fi
#3.12.13 Set SSH MaxAuthTries to 5 or Less
sed -i 's/#MaxAuthTries 6/MaxAuthTries 5/g' /etc/ssh/sshd_config
echo "3.12.13-ssh MaxAuthTries configured sucessfully" >> /tmp/linuxreport.txt
#3.12.15 Set SSH HostbasedAuthentication to No
sed -i 's/#HostbasedAuthentication no/HostbasedAuthentication no/g' /etc/ssh/sshd_config
echo "3.12.15-Disabled HostbasedAuthentication in ssh" >> /tmp/linuxreport.txt
###################################################################
##Adding Alternate user in the system
read -p "Enter username : " username
read -s -p "Enter password : " password
egrep "^$username" /etc/passwd >/dev/null
if [ $? -eq 0 ]; then
echo "$username exists!"
exit 1
else
pass=$(perl -e 'print crypt($ARGV[0], "password")' $password)
useradd -m -p $pass $username
echo "user '$username' is added in the system"
fi
#3.12.16 Disable SSH Root Login
ssh_root=`cat /etc/ssh/sshd_config |grep "#PermitRootLogin"|awk -F " " '{print $2}'`
if [ "$ssh_root" == "yes" ]; then
sed -i 's/#PermitRootLogin yes/PermitRootLogin no/g' /etc/ssh/sshd_config
echo "3.12.16-root login is diabled for this server" >> /tmp/linuxreport.txt
fi
#3.12.17 Set SSH PermitEmptyPasswords to No
empty_pass=`cat /etc/ssh/sshd_config |grep "#PermitEmptyPasswords"|awk -F " " '{print $2}'`
if [ "empty_pass" == "no" ]; then
sed -i 's/#PermitEmptyPasswords no/PermitEmptyPasswords no/g' /etc/ssh/sshd_config
echo " 3.12.17-ssh PermitEmptyPasswords is diabled for this system" >> /tmp/linuxreport.txt
fi
##3.12.18 Use Only Approved Ciphers
echo Ciphers aes128-ctr,aes192-ctr,aes256-ctr >> /etc/ssh/sshd_config
echo " 3.12.18-Ciphers are updated in ssh" >> /tmp/linuxreport.txt
#3.12.20 Set SSH Banner
cat << EOF >> /etc/issue
************************************************************NOTICE*** SECURITY POLICY****************************************************************
WARNING! This is an secure computer system and may be accessed only by authorized users. These computer systems are provided for business purposes and must be used in an ethical lawful manner. All data contained here is owned by company authority ., and may be monitored, examined, intercepted, blocked, deleted, captured and disclosed in any manner, by authorized personnel. Individuals or groups using this system in excess of their authorization will have all access terminated. Unauthorized use or misuse of this system is strictly prohibited and may be subject to disciplinary action.
**************************************************************NOTICE*** SECURITY POLICY******************************************************
EOF
cat /etc/ssh/sshd_config |grep "#Banner"
if [ $? -eq 0 ]; then
sed -i 's/Banner/#Banner/g' /etc/ssh/sshd_config
echo Banner /etc/issue >> /etc/ssh/sshd_config
echo " 3.12.20-Banner is configured successfuly for this system" >> /tmp/linuxreport.txt
fi
###3.12.21 Configure PAM
grep "^password.*pam_cracklib.so.*" /etc/pam.d/system-auth
if [ $? -eq 0 ]; then
sed -i 's/^password.*requisite.*pam_cracklib.so.*/password required pam_cracklib.so try_first_pass retry=3 minlen=14,dcredit=-1,ucredit=-1,ocredit=-1 lcredit=-1/g' /etc/pam.d/system-auth
echo " 3.12.21-PAM is configured sucessfully " >> /tmp/linuxreport.txt
fi
####3.12.22 Set Strong Password Creation Policy Using pam_passwdqc
grep "^password.*pam_passwdqc.so.*" /etc/pam.d/system-auth
if [ $? -eq 0 ]; then
sed -i 's/^password.*requisite.*pam_passwdqc.so.*/password requisite pam_passwdqc.so min=disabled,disabled,16,12,8/g' /etc/pam.d/system-auth
echo "3.12.22-Strong password creation policy is configured sucessfully" >> /tmp/linuxreport.txt
fi
###3.12.24 Upgrade Password Hashing Algorithm to SHA-512
authconfig --test |grep "hashing" |grep "sha512"
if [ $? -eq 0 ]; then
echo "3.12.24-Password hashing algorithm is already avilable in this system" >> /tmp/linuxreport.txt
else
authconfig --passalgo=sha512 --update
authconfig --test | grep hashing | grep sha512
if [ $? -eq 0 ]; then
echo "3.12.24-Hashing Algorithm is upgraded sucessfully" >> /tmp/linuxreport.txt
fi
fi
###3.12.25 Limit Password Reuse
grep "password.*pam_unix.so.*" /etc/pam.d/system-auth
if [ $? -eq 0 ]; then
sed -i 's/password sufficient pam_unix.so sha512 shadow nullok try_first_pass use_authtok/password sufficient pam_unix.so sha512 shadow nullok try_first_pass use_authtok remember=3/g' /etc/pam.d/system-auth
fi
echo "3.12.25-Limit password reuse is configured sucessfully" >> /tmp/linuxreport.txt
###3.13.2 Set Password Expiration Days
sed -i 's/PASS_MAX_DAYS/#PASS_MAX_DAYS/g' /etc/login.defs
echo PASS_MAX_DAYS 90 >> /etc/login.defs
chage --maxdays 90 omadmin
echo "3.13.2-Password expiration date is configured sucessfully" >> /tmp/linuxreport.txt
####3.13.3 Set Password Change Minimum Number of Days
sed -i 's/PASS_MIN_DAYS/#PASS_MIN_DAYS/g' /etc/login.defs
echo PASS_MIN_DAYS 7 >> /etc/login.defs
chage --mindays 7 omadmin
echo "3.13.3-Password change minimum number of days is configured sucessfully" >> /tmp/linuxreport.txt
###3.13.5 Set Default Group Account (root)
usermod -g 0 root
grep root /etc/passwd | awk -F ":" '{print $4}'
if [ $? -eq 0 ]; then
echo "3.13.5-Default Group Account is set for root" >> /tmp/linuxreport.txt
fi
#####################################################################################################################
#3.13.8 Set Warning Banner for Standard Login Services
cat /etc/motd |grep "OnMobile Global"
if [ $? -ne 0 ]; then
echo "This is a secure computer system. Authorized uses only. All activity may be monitored and reported." >> /etc/motd
echo "This is a secure computer system. Authorized uses only. All activity may be monitored and reported." >> /etc/issue
chown root:root /etc/motd
chown root:root /etc/issue
chmod 644 /etc/motd
chmod 644 /etc/issue
echo "3.13.8-Warning Banner is configured" >> /tmp/linuxreport.txt
else
echo "3.13.8-Warning Banner is already configured" >> /tmp/linuxreport.txt
fi
#######################################################################################################################
