By storrgie
I recently launched a CentOS 7 droplet and noticed that both firewalld and selinux were disabled by default. Does anyone have a good introductory guide on hardening CentOS 7?
I’m used to setting up an Ubuntu Server install such as:
- ssh hardening (ports, retries, key_auth. fail2ban)
- firewall hardening (ufw)
- application specific hardening
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See here: RHEL7 Security Guide
And here: RHEL7 SELinux
In particular:
systemctl start firewalld
systemctl enable firewalld
And
vi /etc/selinux/config
set enforcing or permissive.
shutdown -r now (or reboot)
After reboot, confirm:
sestatus
And to harden ssh: First confirm you’re able to login via ssh keys. Then generate a list of all authentication methods, like this:
man sshd_config | grep 'Authentication$'
Then
vi /etc/ssh/sshd_config
Search for all instances of “Authentication” and comment them out. Paste the afore-generated list, as follows:
PubkeyAuthentication yes
RSAAuthentication no
ChallengeResponseAuthentication no
GSSAPIAuthentication no
HostbasedAuthentication no
KerberosAuthentication no
PasswordAuthentication no
RhostsRSAAuthentication no
And restart sshd
systemctl restart sshd
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