SELinux,Fail2ban,Security Configurations

Install firewalld

 sudo yum install firewalld
 sudo systemctl start firewalld
 sudo systemctl enable firewalld
 sudo systemctl status firewalld

 sudo firewall-cmd --permanent --add-service=http
 sudo firewall-cmd --permanent --add-service=https
 sudo firewall-cmd --permanent --list-all
 sudo firewall-cmd --reload

 nano /etc/firewalld/firewalld.conf
 # AllowZoneDrifting=no

 Follow this link for Additional Firewall-Cmd Commands

SELinux Permissions

 setsebool -P httpd_can_network_connect 1
 setsebool -P httpd_execmem 1
 setsebool -P httpd_setrlimit 1
 setsebool -P httpd_can_sendmail 1
 setsebool -P allow_httpd_mod_auth_pam 1
 setsebool -P httpd_mod_auth_pam 1
 setsebool -P httpd_read_user_content 1
 setsebool -P httpd_run_stickshift 1
 setsebool -P httpd_enable_cgi 1
 setsebool -P httpd_unified 1
 setsebool -P httpd_enable_homedirs 1

FAIL2BAN

 sudo yum -y install epel-release
 sudo yum -y install fail2ban
 sudo systemctl enable fail2ban && sudo systemctl start fail2ban

nano /etc/fail2ban/jail.conf

 [DEFAULT]
 # Ban hosts for one hour:
 bantime = 360000
 findtime = 3600
 maxretry = 2

 # Override /etc/fail2ban/jail.d/00-firewalld.conf:
 banaction = iptables-multiport
 ignoreip = 127.0.0.1/8 154.160.2.127/16

 [sshd]
 enabled = true

 systemctl start fail2ban
 sudo systemctl status fail2ban
 sudo systemctl restart fail2ban

 sudo fail2ban-client status
 sudo fail2ban-client status sshd
 sudo fail2ban-client status wordpress
 sudo fail2ban-client status wordpress2
 sudo fail2ban-client status wordpress3
 sudo fail2ban-client status http-get-post-dos

Install Letsencrypt

 dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
 # (for centos 8) dnf config-manager --set-enabled PowerTools
 sudo dnf install certbot python3-certbot-nginx
 OR dnf install certbot python3-certbot-apache

 certbot --version
 certbot --nginx
 OR certbot --apache
 certbot --apache -d wiki.rhomicom.com
 certbot --nginx-d wiki.rhomicom.com

 certbot renew
 certbot certificates
 certbot certonly --apache
 certbot certonly --nginx
 sudo certbot certonly --standalone --debug -d api.example.net

 echo "0 0,12 * * * root python3 -c 'import random; import time; time.sleep(random.random() * 3600)' && certbot renew -q" | sudo tee -a /etc/crontab > /dev/null
 @daily /usr/bin/certbot renew >> /var/log/le-renew.log
 0 1   * * * dnf -y update
 0 */5 * * * /home/all_bkps.sh

SELF-SIGNED SSL

 openssl req -new -newkey rsa:4096 -nodes -keyout rho-demo.key -out rho-demo.csr #(Copy and send .csr file content to Certificate Authority)

 mkdir -p /etc/pki/nginx
 mkdir -p /etc/pki/nginx/private

openssl req -newkey rsa:4096 -nodes -keyout /etc/pki/nginx/private/server.key -x509 -days 365 -out /etc/pki/nginx/server.crt -subj "/C=GH/ST=Greater Accra/L=Accra/O=Rhomicom Demo/OU=IT/CN=*.rhomicom.com/emailAddress=admin@rhomicom.com"

 openssl dhparam -out /etc/pki/nginx/dhparam.pem 4096
 nano /etc/nginx/nginx.conf #(# Add DH parameters
       ssl_dhparam /etc/pki/nginx/dhparam.pem;)
 nginx -t
 systemctl restart nginx
 visit this page for sample full nginx.conf file