Server Optimization/Hardening

cd /usr/local/src/
tar -zxvf clamav-0.95.2.tar.gz
cd clamav-0.95.2
useradd clamav
./configure
make
make install
ldconfig
yum install zlib zlib-devel
========================================================
cd /usr/local/src
wget ftp://ftp.pangeia.com.br/pub/seg/pac/chkrootkit.tar.gz
tar -zxvf chkrootkit.tar.gz
cd chkrootkit
make sense
./chkrootkit
========================================================
cd /usr/local/src
tar -zxvf rkhunter-1.3.6.tar.gz
cd rkhunter
./installer.sh –layout default –install
========================================================
cd /usr/local/src
tar -zxvf libsafe-2.0-16.tgz
cd libsafe-2.0-16
make
make install
$ LD_PRELOAD=/lib/libsafe.so.2
$ export LD_PRELOAD
echo ‘/lib/libsafe.so.2′ >> /etc/ld.so.preload
========================================================
mkdir -p /usr/src/downloads
cd /usr/src/downloads
cd logcheck-1.1.1/systems
cd linux
vi logcheck.sh
Now change the variable SYSADMIN to root@hostname.com
cd ../../
mkdir -p /usr/local/etc/tmp
make linux
0 3 * * * /usr/local/etc/logcheck.sh
/etc/init.d/cron restart
========================================================
yum install sysstat
========================================================
wget ftp://ftp.kaybee.org/pub/linux/logwatch-7.3.6.tar.gz
tar -zxvf logwatch-7.3.6.tar.gz
./install_logwatch.sh
/etc/log.d/scripts/logwatch.pl
set email in /usr/share/logwatch/default.conf/logwatch.conf to root@hostname.com
====================================================================
yum install smartmontools
======================================================================
“Sysctl hardening for preventing SYNC/DOS attack”
cp -p /etc/sysctl.conf /etc/sysctl.conf.bk
In /etc/sysctl.conf
Paste the following into the file, you can overwrite the current information.
#Kernel sysctl configuration file for Red Hat Linux
# For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and
# sysctl.conf(5) for more details.
# Disables packet forwarding
net.ipv4.ip_forward=0
# Disables IP source routing
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.lo.accept_source_route = 0
net.ipv4.conf.eth0.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0
# Enable IP spoofing protection, turn on source route verification
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.lo.rp_filter = 1
net.ipv4.conf.eth0.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
# Disable ICMP Redirect Acceptance
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.lo.accept_redirects = 0
net.ipv4.conf.eth0.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
# Enable Log Spoofed Packets, Source Routed Packets, Redirect Packets
net.ipv4.conf.all.log_martians = 0
net.ipv4.conf.lo.log_martians = 0
net.ipv4.conf.eth0.log_martians = 0
# Disables IP source routing
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.lo.accept_source_route = 0
net.ipv4.conf.eth0.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0
# Enable IP spoofing protection, turn on source route verification
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.lo.rp_filter = 1
net.ipv4.conf.eth0.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
# Disable ICMP Redirect Acceptance
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.lo.accept_redirects = 0
net.ipv4.conf.eth0.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
# Disables the magic-sysrq key
kernel.sysrq = 0
# Decrease the time default value for tcp_fin_timeout connection
net.ipv4.tcp_fin_timeout = 15
# Decrease the time default value for tcp_keepalive_time connection
net.ipv4.tcp_keepalive_time = 1800
# Turn off the tcp_window_scaling
net.ipv4.tcp_window_scaling = 0
# Turn off the tcp_sack
net.ipv4.tcp_sack = 0
# Turn off the tcp_timestamps
net.ipv4.tcp_timestamps = 0
# Enable TCP SYN Cookie Protection
net.ipv4.tcp_syncookies = 1
# Enable ignoring broadcasts request
net.ipv4.icmp_echo_ignore_broadcasts = 1
# Enable bad error message Protection
net.ipv4.icmp_ignore_bogus_error_responses = 1
# Log Spoofed Packets, Source Routed Packets, Redirect Packets
net.ipv4.conf.all.log_martians = 1
# Increases the size of the socket queue (effectively, q0).
net.ipv4.tcp_max_syn_backlog = 1024
# Increase the tcp-time-wait buckets pool size
net.ipv4.tcp_max_tw_buckets = 1440000
# Allowed local port range
net.ipv4.ip_local_port_range = 16384 65536
then
Run /sbin/sysctl -p and sysctl -w net.ipv4.route.flush=1 to enable the changes
without a reboot.
======================================================================
“Inetd hardening”
mv  /etc/xinetd.d/telnet /etc/xinetd.d/telnet.bk
/etc/rc.d/init.d/xinetd restart
======================================================================
“Host.conf Hardening”
cp -p /etc/host.conf /etc/host.conf.bk
vi /etc/host.conf
multi on
nospoof on
======================================================================
“Hardening Pure/Proftpd”
cp -p /etc/pure-ftpd.conf /etc/pure-ftpd.conf.bk
vi /etc/pure-ftpd.conf
AnonymousOnly no
NoAnonymous yes
PassivePortRange 30000 30050
======================================================================
“Root Login Email alert”
cd /root
3. vi .bashrc
4. Scroll to the end of the file then add the following:
echo ‘ALERT – Root Shell Access (hostname) on:’ `date` `who` | mail -s “Alert:
Root Access from `who | cut -d’(‘ -f2 | cut -d’)’ -f1`” root@hostname.com
======================================================================
“Install Mod_evasive
cp -p /usr/local/apache/conf/httpd.conf /usr/local/apache/conf/httpd.conf.date
tar -zxvf mod_evasive_1.10.1.tar.gz
cd mod_evasive
Compile mod_evasive apache module (Apache 2):
/usr/local/apache/bin/apxs -i -a -c mod_evasive20.c
vi /usr/local/apache/conf/httpd.conf
<IfModule mod_evasive20.c>
DOSHashTableSize 3097
DOSPageCount 5
DOSSiteCount 100
DOSPageInterval 2
DOSSiteInterval 2
DOSBlockingPeriod 10
DOSBlockingPeriod 600
DOSEmailNotify user@domain.com
</IfModule>
======================================================================
Prevent the execution of spamming scripts
cp -p /etc/apf/conf.apf /etc/apf/conf.apf.bk
a – iptables module ipt_owner
b – enable EGF in apf “Outbound (egress) filtering”
c – add this line that will be explained later in the EGF section.
EG_TCP_UID=”0:25,8:25,47:25,32002:25,0:465,8:465,47:465,32002:465″
d – restart apf
======================================================================
4 comments on “Server Optimization/Hardening
  1. Please explain what you are doing ?

    Like this

  2. It will be more appreciative if we could know what each of the task does

    Like this

  3. Doezer says:

    Just read the first line after the “===============”, it’s written

    Like this

  4. Mohan says:

    an you explain why libsafe-2.0-16.tgz,
    rkhunter-1.3.6.tar.gz
    chkrootkit.tar.gz
    clamav-0.95.2.tar.gz
    smartmontools
    logcheck.sh
    logwatch-7.3.6.tar.gz is installed.

    Like this

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