Thread: A Beginner's Guide to Securing Your Server View Single Post
#3 10-02-2004, 10:27 AM
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Registered User Join Date: Sep 2004
Posts: 17
A Beginner's Guide to Securing Your Server Part 3 of 3 (Apps to install)
These are applications that will help to secure your server.
Install chkrootkit
To install chrootkit, SSH into server and login as root.
At command prompt type: cd /root/
At command prompt type: wget
ftp://ftp.pangeia.com.br/pub/seg/pac/chkrootkit.tar.gz
At command prompt type: tar xvzf chkrootkit.tar.gz
At command prompt type: cd chkrootkit-0.44
At command prompt type: make sense
To run chkrootkit
At command prompt type: /root/chkrootkit-0.44/chkrootkit
Make sure you run it on a regular basis, perhaps including it in a cron job.
Install APF Firewall
To install APF, SSH into server and login as root.
At command prompt type: cd /root/
At command prompt type: wget
http://www.rfxnetworks.com/downloads/apf-current.tar.gz
At command prompt type: tar -xvzf apf-current.tar.gz
At command prompt type: rm -f apf-current.tar.gz
At command prompt type: cd apf-0.9.4-6
At command prompt type: sh ./install.sh
After APF has been installed, you need to edit the configuration file.
At command prompt type: cd /etc/apf
At command prompt type: pico -w conf.apf
Scroll down and find
USE_DS="0"
change it to
USE_DS="1"
Now scroll down and configure the Ports. The following ports are required for CPanel:
Code:
Common ingress (inbound) TCP ports
IG_TCP_CPORTS="21,22,25,53,80,110,143,465,953,993, 995,2082,2083,2 084,2086,2087,2095,2096,3306,6666,7786,3000_3500"
Note: If you changed the port for SSH, be sure to include that port and remove port 22.
-----
21 FTP (TCP)
22 SSH (TCP)
25 SMTP (TCP)
53 DNS - Domain Name Server (TCP)
80 HTTP (TCP)
110 POP3 (TCP)
143 IMAP (TCP)
443 HTTPS (TCP)
465 sSMTP (TCP)
953 ??BIND??
993 IMAP4 protocol over TLS/SSL (TCP)
995 POP3 protocol over TLS/SSL (was spop3) (TCP)
2082 CPANEL (
http://sitename.com:2082) (TCP)
2083 CPANEL SSL (
https://sitename.com:2083) (TCP)
2084 entropychat server (disable from CPANEL service manager if not used) (TCP)
2086 WHM (
http://sitename.com:2086) (TCP)
2087 WHM SSL (
https://sitename.com:2087) (TCP)
2095 WebMail (
http://sitename.com:2095) (TCP)
2096 WebMail SSL (
https://sitename.com:2096)
3306 mySQL remote access (TCP)
6666 Melange chat Server (disable from CPANEL service manager if not used) (TCP)
7786 Interchange (TCP)
3000_3500
-----
5100 for ASP,
8080 and 8443 for JSP if you use them.
-----
Code:
Common ingress (inbound) UDP ports
IG_UDP_CPORTS="53,6277
-----
53 DNS - Domain Name Server
6277 SpamAssassin / DCC (email scanning)
-----
Code:
Common ICMP (inbound) types
IG_ICMP_TYPES="3,5,11,0,30,8"
-----
0 Echo Reply
3 Destination Unreachable
5 Destination Unreachable
8 Echo
11 Time Exceeded
30 Traceroute
-----
Code:
Common egress (outbound) TCP ports
EG_TCP_CPORTS="21,25,37,53,80,110,113,#123,443,43, 873,953,2089,27 03,3306"
-----
21 FTP
25 SMTP
37 Required for CPANEL Licensing
53 DNS - Domain Name Server
80 HTTP
110 POP3 (if you have scripts that need to retrieve email via POP, e.g. HelpDesk)
113 Authentication Protocol (AUTH)
123 NTP (Network Time)
443 HTTPS
43 WHOIS
873 rsync (CPanel updates)
953 BIND ??
2089 Required for CPANEL Licensing
2703 Razor (email scanning)
3306 mySQL remote access
-----
Code:
Common egress (outbound) UDP ports
EG_UDP_CPORTS="20,21,53,873,953,6277"
-----
20 ftp-data
21 FTP
53 DNS - Domain Name Server
873 rsync
953 BIND ??
6277 SpamAssassin / DCC (email scanning)
-----
Code:
Common ICMP (outbound) types
EG_ICMP_TYPES="all"
Save the changes then exit.
To start APF
At command prompt type: /usr/local/sbin/apf -s
APF commands are:
-s start
-r restart
-f flush - stop
-l list
-st status
-a HOST allow HOST
-d HOST deny HOST
Log out of SSH and then login again.
After you are sure everything is working fine, change the DEV option
At command prompt type: cd /etc/apf
At command prompt type: pico -w conf.apf
Scroll down and find
DEVM="1"
change it to
DEVM="0"
Save changes, exit and then restart firewall,
At command prompt type: /usr/local/sbin/apf -r
Install BFD (Brute Force Detection)
To install BFD, SSH into server and login as root.
At command prompt type: cd /root/
At command prompt type: wget
http://www.rfxnetworks.com/downloads/bfd-current.tar.gz
At command prompt type: tar -xvzf bfd-current.tar.gz
At command prompt type: cd bfd-0.4
At command prompt type: ./install.sh
After BFD has been installed, you need to edit the configuration file.
At command prompt type: pico /usr/local/bfd/conf.bfd
Under Enable brute force hack attempt alerts:
Find
ALERT_USR="0"
and change it to
ALERT_USR="1"
Find
EMAIL_USR="root"
and change it to
EMAIL_USR="
your@email.com"
Save the changes then exit.
To start BFD
At command prompt type: /usr/local/sbin/bfd -s
Modify LogWatch
Logwatch is a customizable log analysis system. It parses through your system's logs for a given period of time and creates a report analyzing areas that you specify, in as much detail as you require. Logwatch is already installed on most CPanel servers.
To modify LogWatch, SSH into server and login as root.
At command prompt type: pico -w /etc/log.d/conf/logwatch.conf
Scroll down to
MailTo = root
and change to
Mailto =
your@email.com
Note: Set the e-mail address to an offsite account incase you get hacked.
Now scroll down to
Detail = Low
Change that to Medium, or High...
Detail = 5 or Detail = 10
Note: High will give you more detailed logs with all actions.
Save and exit.
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