{"id":357,"date":"2012-06-26T03:46:00","date_gmt":"2012-06-26T03:46:00","guid":{"rendered":"http:\/\/pheonixsolutions.com\/hardening-the-linux-server-or-cenos-56-2\/"},"modified":"2012-07-12T05:53:06","modified_gmt":"2012-07-12T05:53:06","slug":"hardening-the-linux-server-or-cenos-56-2","status":"publish","type":"post","link":"https:\/\/pheonixsolutions.com\/blog\/hardening-the-linux-server-or-cenos-56-2\/","title":{"rendered":"Hardening the linux server or cenos 5\/6.2"},"content":{"rendered":"<div style=\"text-align: left;\" dir=\"ltr\"><span style=\"white-space: pre-wrap;\"><strong>How to harden the Linux server or centos 5 or centos 6.2<\/strong><\/span><br \/>\n<strong><br \/>\n<\/strong> <span style=\"white-space: pre-wrap;\"><strong>SPRI (Priority Scheduler)<\/strong><\/span><br \/>\n<span style=\"white-space: pre-wrap;\">cd \/root\/<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">wget http:\/\/www.rfxn.com\/downloads\/spri-current.tar.gz<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">tar xvfz spri-*.tar.gz<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">cd spri-*<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">.\/install.sh<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">spri -v<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\"><strong>PRM (Process Resource Monitor)<\/strong><\/span><br \/>\n<span style=\"white-space: pre-wrap;\">cd \/root<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">wget http:\/\/www.rfxn.com\/downloads\/prm-current.tar.gz<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">tar xvfz prm-*.tar.gz<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">cd prm-*<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">.\/install.sh<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">prm -j<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\"><strong>Temporary Directory Hardening<\/strong><\/span><br \/>\n<span style=\"white-space: pre-wrap;\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">\/bin\/cp \/etc\/fstab \/etc\/fstab.bak<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\">Use df to check if a \/tmp partition is already present.<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\">[if no \/tmp partition present]<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">cd \/usr<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">dd if=\/dev\/zero of=\/usr\/tmpMnt bs=1024 count=2000000<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\">mke2fs -j \/usr\/tmpMnt<\/span><span style=\"white-space: pre-wrap;\">cd \/\u00c2\u00a0<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">cp -R \/tmp \/tmp_backup\u00c2\u00a0<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\">mount -o loop,noexec,nosuid,rw \/usr\/tmpMnt \/tmp\u00c2\u00a0<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">chmod 0777 \/tmp\u00c2\u00a0<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">\/bin\/cp -R \/tmp_backup\/* \/tmp\/\u00c2\u00a0<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">rm -rf \/tmp_backup\u00c2\u00a0<\/span><\/p>\n<p><span style=\"white-space: pre-wrap;\">nano -w \/etc\/fstab\u00c2\u00a0<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\">At the very bottom add\u00c2\u00a0<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">\/usr\/tmpMnt \/tmp ext3 loop,noexec,nosuid,rw 0 0<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\">nano -w \/etc\/fstab<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">change \u00e2\u20ac\u0153defaults\u00e2\u20ac\u009d to loop,noexec,nosuid,rw<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">mount \/tmp<\/span><\/p>\n<p><span style=\"white-space: pre-wrap;\">rm -rf \/var\/tmp<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">ln -s \/tmp \/var\/tmp<\/span><\/p>\n<p><span style=\"white-space: pre-wrap;\">If a symlink is not possible, then \/var\/tmp is most likely also a partition. In this case, \/var\/tmp must be hardened with loop,noexec,nosuid,rw in fstab as well.<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\">IF \/tmp is hardened by cpanel\u00e2\u20ac\u2122s \/scripts\/securetmp. Remove the line from \/etc\/rc.d\/rc.local and then reboot. It will come back without a \/tmp partition and then you can follow the instructions above<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\"><strong>SSH Server Hardening<\/strong><\/span><br \/>\n<span style=\"white-space: pre-wrap;\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">nano -w \/etc\/ssh\/sshd_config<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">Uncomment #Protocol 2, 1<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">Change to Protocol 2<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\">Append these lines to the bottom:<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">LoginGraceTime 120\u00c2\u00a0<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">IgnoreRhosts yes\u00c2\u00a0<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">X11Forwarding no\u00c2\u00a0<\/span><\/p>\n<\/div>\n<div style=\"text-align: left;\" dir=\"ltr\"><\/div>\n<div style=\"text-align: left;\" dir=\"ltr\"><span style=\"white-space: pre-wrap;\">\/etc\/rc.d\/init.d\/sshd restart<\/span><\/div>\n<div style=\"text-align: left;\" dir=\"ltr\"><span style=\"white-space: pre-wrap;\">DISABLE DIRECT ROOT LOGIN<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">If he already has an su user, good. If not:<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\nR<\/span><span style=\"white-space: pre-wrap;\">EPLACE XXX with 3 numbers<\/span><span style=\"white-space: pre-wrap;\">groupadd anyuserxxx<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">useradd anyuserXXX \u00e2\u20ac\u201cganyuserXXX<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">passwd anyuserXXX<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">type password<\/span><\/p>\n<p><span style=\"white-space: pre-wrap;\">nano -w \/etc\/group<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">Search for wheel, then append \u00e2\u20ac\u0153anyuserxxx\u00e2\u20ac\u009d\u00c2\u00a0<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">So it should be \u00e2\u20ac\u0153root,anyuserXXX\u00e2\u20ac\u009d<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\">nano -w \/etc\/ssh\/sshd_config<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\">PermitRootLogin no (and uncomment)<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\">At the bottom add<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">AllowUsers anyuserXXX<\/span><\/p>\n<p><span style=\"white-space: pre-wrap;\"><strong>ChkRootKit<\/strong><\/span><br \/>\n<span style=\"white-space: pre-wrap;\">&#8212;&#8212;&#8212;&#8212;&#8211;<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">cd \/root\/<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">wget ftp:\/\/ftp.pangeia.com.br\/pub\/seg\/pac\/chkrootkit.tar.gz<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">mv chkrootkit.tar.gz \/usr\/local\/src\/<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">cd \/usr\/local\/src\/<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">tar -zxf chkrootkit.tar.gz<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">cd \/usr\/local\/src\/chkrootkit*<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">make sense<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">cd \/root<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">mv \/usr\/local\/src\/chkrootkit* \/usr\/local\/chkrootkit<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\">cd \/etc\/cron.weekly<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\">Code: Select all<\/span><\/p>\n<p><span style=\"white-space: pre-wrap;\">#!\/bin\/bash<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">EMAIL=your@domain.com<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">\/usr\/local\/chkrootkit\/chkrootkit -q | mail -s &#8220;ChrootKit Scan Report &#8211; $(hostname)&#8221; $EMAIL<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">chmod 755 \/etc\/cron.weekly\/chkrootkit.sh<\/span><\/p>\n<p><span style=\"white-space: pre-wrap;\"><strong>RkHunter<\/strong><\/span><br \/>\n<span style=\"white-space: pre-wrap;\">&#8212;&#8212;&#8212;&#8212;<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">cd \/root<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"> w<\/span><span style=\"white-space: pre-wrap;\">get http:\/\/space.dl.sourceforge.net\/project\/rkhunter\/rkhunter\/1.3.8\/rkhunter-1.3.8.tar.gz<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">wget http:\/\/space.dl.sourceforge.net\/project\/rkhunter\/rkhunter\/1.3.8\/rkhunter-1.3.8.tar.gz<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">tar -zxf rkhunter-1.3.4.tar.gz<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">cd rkhunter*<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">.\/installer.sh &#8211;layout default &#8211;install<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\">cd \/etc\/cron.weekly<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\">Code: Select all<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">#!\/bin\/bash<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">EMAIL=your@domain.com<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">rkhunter \u00c2\u00a0-c &#8211;sk &#8211;summary -q | \u00c2\u00a0mail -s &#8220;Rkhunter Scan Report &#8211; $(hostname)&#8221; $EMAIL<\/span><\/p>\n<\/div>\n<div style=\"text-align: left;\" dir=\"ltr\"><\/div>\n<div style=\"text-align: left;\" dir=\"ltr\"><span style=\"white-space: pre-wrap;\">chmod 755 \/etc\/cron.weekly\/rkhunter.sh<\/span><br \/>\n<span style=\"white-space: pre-wrap;\"><br \/>\n<\/span><span style=\"white-space: pre-wrap;\"><strong>Installing CSF firewall<\/strong><\/span><br \/>\n<span style=\"white-space: pre-wrap;\">&#8212;&#8212;<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">wget http:\/\/www.configserver.com\/free\/csf.tgz<\/span><\/div>\n<div style=\"text-align: left;\" dir=\"ltr\"><span style=\"white-space: pre-wrap;\">tar -xzf csf.tgz<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">cd csf<\/span><\/div>\n<div style=\"text-align: left;\" dir=\"ltr\"><\/div>\n<div style=\"text-align: left;\" dir=\"ltr\"><span style=\"white-space: pre-wrap;\">sh install.sh<\/span><span style=\"white-space: pre-wrap;\">Next, test whether you have the required iptables modules:<\/span><br \/>\n<span style=\"white-space: pre-wrap;\">perl \/etc\/csf\/csftest.pl<\/span><\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<div style=\"text-align: left;\" dir=\"ltr\">\n<div style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\"><!--EndFragment--><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>How to harden the Linux server or centos 5 or centos 6.2 SPRI (Priority Scheduler) cd \/root\/ wget http:\/\/www.rfxn.com\/downloads\/spri-current.tar.gz tar xvfz spri-*.tar.gz cd spri-* .\/install.sh spri -v PRM (Process Resource Monitor) cd \/root wget http:\/\/www.rfxn.com\/downloads\/prm-current.tar.gz tar xvfz prm-*.tar.gz cd prm-* .\/install.sh prm -j Temporary Directory Hardening &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211; \/bin\/cp \/etc\/fstab \/etc\/fstab.bak&hellip; <a href=\"https:\/\/pheonixsolutions.com\/blog\/hardening-the-linux-server-or-cenos-56-2\/\" class=\"more-link read-more\" rel=\"bookmark\">Continue Reading <span class=\"screen-reader-text\">Hardening the linux server or cenos 5\/6.2<\/span><i class=\"fa 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max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/pheonixsolutions.com\/blog\/hardening-the-linux-server-or-cenos-56-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to harden the Linux server or centos 5 or centos 6.2\" \/>\n<meta property=\"og:description\" content=\"How to harden the Linux server or centos 5 or centos 6.2 SPRI (Priority Scheduler) cd \/root\/ wget http:\/\/www.rfxn.com\/downloads\/spri-current.tar.gz tar xvfz spri-*.tar.gz cd spri-* .\/install.sh spri -v PRM (Process Resource Monitor) cd \/root wget http:\/\/www.rfxn.com\/downloads\/prm-current.tar.gz tar xvfz prm-*.tar.gz cd prm-* .\/install.sh prm -j Temporary Directory Hardening &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211; \/bin\/cp \/etc\/fstab \/etc\/fstab.bak&hellip; Continue Reading Hardening the linux server or cenos 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