{"id":6238,"date":"2021-03-19T13:39:32","date_gmt":"2021-03-19T08:09:32","guid":{"rendered":"https:\/\/www.skynats.com\/?p=6238"},"modified":"2024-12-12T14:18:37","modified_gmt":"2024-12-12T08:48:37","slug":"install-and-configure-csf","status":"publish","type":"post","link":"https:\/\/www.skynats.com\/blog\/install-and-configure-csf\/","title":{"rendered":"How to Install and Configure CSF"},"content":{"rendered":"\n

Config Server Firewall \/ CSF<\/strong> the firewall application designed for Linux servers. CSF is a Login\/Intrusion Detection that effective for applications like SSH, SMTP, IMAP, Pop3, the “su” command and many others.<\/p>\n\n\n\n

The CSF use to recognize the user who uses to login into the server via SSH, will send an alert if they trying to utilize the “su” command to attain higher privileges on the server.<\/p>\n\n\n\n

 Another key function of CSF is that it will checks for login authentication failures on mail servers (Exim, IMAP, Dovecot, uw-imap, Kerio),Ftp servers (Pure-ftpd, vsftpd, Proftpd), cPanel server, OpenSSH servers and Plesk and the Cpanel to replace software like fail2ban.<\/p>\n\n\n\n

For the hosting servers, the CSF is the best security solution that can easily be integrated into the user interface(UI)of WHM\/cPanel, Plesk, Webmin and DirectAdmin.<\/p>\n\n\n\n

From this blog, you will get an apparent view regarding the installation and configuration of CSF as a part of our\u00a0server management<\/span><\/a> plan<\/span>. You can also take assistance from our technical team support 24\/7 for further Migration and configuration<\/p>\n\n\n\n

Steps to follow:<\/p>\n\n\n\n

Step 1<\/strong><\/p>\n\n\n\n

 Install CSF Dependencies<\/p>\n\n\n\n

You need to install the server to begin the CSF based Perl, it required to have Wget for downloading the CSF installer. Use the following commands in order to install the package and change the CSF configuration file.<\/p>\n\n\n\n

yum install wget vim perl-libwww-perl.noarch perl-Time-HiRes<\/code><\/pre>\n\n\n\n
Step 2 <\/p>\n\n\n\n
CSF Installation<\/p>\n\n\n\n
Navigate to the \u201c\/usr\/src\/\u201d directory to download CSF using this wget command:<\/p>\n\n\n\n
cd \/usr\/src\/\nwget https:\/\/download.configserver.com\/csf.tgz<\/code><\/pre>\n\n\n\n
Extract the tar.gz file and head to the CSF directory. Then, install the tar.gz file:<\/p>\n\n\n\n
tar -xzf csf.tgz\ncd csf\nsh install.sh<\/code><\/pre>\n\n\n\n
If everything goes well you will receive the message stating that the CSF installation completed.<\/p>\n\n\n\n
Later you need to check whether the CSG actually works well on the required server.  <\/p>\n\n\n\n
Make a way to \u201c\/usr\/local\/csf\/bin\/\u201d directory. Then, you\u2019ll need to run \u201ccsftest.pl\u201d, like so:<\/p>\n\n\n\n
cd \/usr\/local\/csf\/bin\/\nperl csftest.pl<\/code><\/pre>\n\n\n\n
By this, you will get an apparent view that the CSF is working well without any issues, if it displays the following response.<\/p>\n\n\n\n
RESULT: csf should function on this server<\/p>\n\n\n\n
Step 3 <\/p>\n\n\n\n
Configuration of CSF<\/p>\n\n\n\n
Before configuring the CSF, the default CentOS 7’s firewall application (\u201cfirewalld\u201d) should be shopped and must be removed from the startup<\/p>\n\n\n\n
To stop it:<\/p>\n\n\n\n
systemctl stop firewalld<\/code><\/pre>\n\n\n\n
To disable and remove firewalld from the startup:<\/p>\n\n\n\n
systemctl disable firewalld<\/code><\/pre>\n\n\n\n
Next, head to the CSF Configuration directory \u201c\/etc\/csf\/\u201d and change the file \u201ccsf.conf\u201d using the vim editor:<\/p>\n\n\n\n
cd \/etc\/csf\/\nvim csf.conf<\/code><\/pre>\n\n\n\n
In order to apply the CSF firewall configuration, you need to change line 11 \u201cTESTING\u201d to \u201c0\u201d.<\/p>\n\n\n\n
TESTING = \u201c0\u201d<\/code><\/pre>\n\n\n\n
Enabling the CSF traffic that is incoming and outgoing by default SSH standard port 22. As per your required, you can add an alternative SSH port to the configuration in line 139 \u201cTCP_IN\u201d.<\/p>\n\n\n\n
Use the following command to start the CSF and the LFD.<\/p>\n\n\n\n
systemctl start csf\nsystemctl start lfd\nSet up the csf and lfd services to start when booting:\nsystemctl enable csf\nsystemctl enable lfd\n<\/code><\/pre>\n\n\n\n
With the following command, you can see the CSF default list.<\/p>\n\n\n\n
csf -l<\/code><\/pre>\n\n\n\n
Step 4<\/p>\n\n\n\n
 Basic CSF Commands<\/p>\n\n\n\n
1. Enabling firewall rules (Starting the CSF firewall) <\/p>\n\n\n\n
csf -s<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
2. Flushing\/stopping firewall rules.<\/p>\n\n\n\n
csf -f<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
3. Reloading firewall rules.<\/p>\n\n\n\n
csf -r<\/code><\/pre>\n\n\n\n
4. To allow an IP and add it to csf.allow.<\/p>\n\n\n\n
csf -a 192.168.1.109<\/code><\/pre>\n\n\n\n
Results:<\/strong><\/p>\n\n\n\n
Adding 192.168.1.109 to csf.allow and iptables ACCEPT...\nACCEPT all opt -- in !lo out * 192.168.1.109 -> 0.0.0.0\/0\nACCEPT all opt -- in * out !lo 0.0.0.0\/0 -> 192.168.1.109\nRemoval and deletion of an IP from csf.allow.\ncsf -ar 192.168.1.109\n<\/code><\/pre>\n\n\n\n
 Results:<\/strong><\/p>\n\n\n\n
Removing rule…<\/p>\n\n\n\n
ACCEPT all opt -- in !lo out * 192.168.1.109 -> 0.0.0.0\/0\nACCEPT all opt -- in * out !lo 0.0.0.0\/0 -> 192.168.1.109\n6. Denial of an IP and then adding it to csf.deny:\ncsf -d 192.168.1.109\n<\/code><\/pre>\n\n\n\n
Results:<\/p>\n\n\n\n
Adding 192.168.1.109 to csf.deny and iptables DROP...\nDROP all opt -- in !lo out * 192.168.1.109 -> 0.0.0.0\/0\nLOGDROPOUT all opt -- in * out !lo 0.0.0.0\/0 -> 192.168.1.109\nRemoval and deletion of an IP from csf.deny.\ncsf -dr 192.168.1.109\n<\/code><\/pre>\n\n\n\n
Results:<\/p>\n\n\n\n
Removing rule…<\/p>\n\n\n\n
DROP all opt -- in !lo out * 192.168.1.109 -> 0.0.0.0\/0\nLOGDROPOUT all opt -- in * out !lo 0.0.0.0\/0 -> 192.168.1.109\nEvery entry from csf.deny will be removed and unblocked\ncsf -df\n<\/code><\/pre>\n\n\n\n
Results:<\/p>\n\n\n\n
DROP all opt -- in !lo out * 192.168.1.110 -> 0.0.0.0\/0\nLOGDROPOUT all opt -- in * out !lo 0.0.0.0\/0 -> 192.168.1.110\nDROP all opt -- in !lo out * 192.168.1.111 -> 0.0.0.0\/0\nLOGDROPOUT all opt -- in * out !lo 0.0.0.0\/0 -> 192.168.1.111\n<\/code><\/pre>\n\n\n\n
csf: all entries removed from csf.deny<\/p>\n\n\n\n
Searching for a pattern match on iptables (such as CIDR, IP, Port Number)<\/p>\n\n\n\n
csf -g 192.168.1.110<\/code><\/pre>\n\n\n\n
Step 5<\/p>\n\n\n\n
Advanced Configuration<\/p>\n\n\n\n
For the configuration, go to the csf configuration directory and from there change the csf.conf configuration file<\/p>\n\n\n\n
cd \/etc\/csf\/\nvim csf.conf<\/code><\/pre>\n\n\n\n
Non-blocking of IP addresses in csf.allow files:<\/p>\n\n\n\n
The LFD block the IPs under csf.allow files as a default. Ensure that specific IP in csf.allow will never block by the LFD, then navigate to line 272 and edit \u201cIGNORE_ALLOW\u201d to \u201c1\u201d.<\/p>\n\n\n\n
Ensure that the internet server or firewall will never block the IP address.  <\/p>\n\n\n\n
IGNORE_ALLOW = \"1\"\nEnabling outgoing and incoming ICMP\nLine 152 for incoming ping\/ICMP:\nICMP_IN = \"1\"\nAnd line 159 for the outgoing ping\/ICMP\nICMP_OUT = \"1\"\n<\/code><\/pre>\n\n\n\n
Block specific countries<\/p>\n\n\n\n
Here you can deny and allow access to certain countries by using the country code( CIDR )<\/p>\n\n\n\n
Use line 836 to add the code of a country that you wish to deny or allow.  <\/p>\n\n\n\n
CC_DENY = \"CN,UK,US\"\nCC_ALLOW = \"ID,MY,DE\"<\/code><\/pre>\n\n\n\n
Emailing the Su and SSH Login log<\/p>\n\n\n\n
Next is setting the address where the LFD is used to send the alert emails about “SSH login” by running the following “su” command.<\/p>\n\n\n\n
To do this, find line 1069 and edit the value to \u201c1\u201d:<\/p>\n\n\n\n
LF_SSH_EMAIL_ALERT = \"1\"\n\u2026\nLF_SU_EMAIL_ALERT = \"1\"\n<\/code><\/pre>\n\n\n\n
Input the email address in order to use this line 588:<\/p>\n\n\n\n
LF_ALERT_TO = \"thismail@thisdomain.tld\"<\/code><\/pre>\n\n\n\n
Have a glance that the option in \u201c\/etc\/csf\/csf.conf\u201d configuration files for further changes.<\/p>\n\n\n\n
Conclusion<\/strong><\/p>\n\n\n\n
In short, Config Server Firewall \/ CSF<\/strong> the firewall application designed for Linux servers. By installing and configuring the CSF that will secure the management with much more efficiency.  <\/p>\n","protected":false},"excerpt":{"rendered":"
Config Server Firewall \/ CSF the firewall application designed for Linux servers. CSF is a Login\/Intrusion Detection that effective for applications like SSH, SMTP, IMAP, Pop3, the “su” command and many others. The CSF use to recognize the user who uses to login into the server via SSH, will send an alert if they trying to […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,208,288,266,239,68],"tags":[527,526],"class_list":["post-6238","post","type-post","status-publish","format-standard","hentry","category-blog","category-centos-7","category-csf","category-firewall","category-linux","category-server-management","tag-csf-configuration","tag-install-csf-in-centos-7"],"yoast_head":"\nInstall and Configure CSF | Server Mnagement Service<\/title>\n<meta name=\"description\" content=\"Config Server Firewall \/ CSF the firewall application designed for Linux servers. 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