Securing ZNC Interface

secure-znc.conf

# Assumptions are you already use letsencrypt and have dhparam generated
# Configure ZNC to listen on IPv4 and only IRC + SSL for client connections
<Listener listener0>
        AllowIRC = false
        AllowWeb = true
        IPv4 = true
        IPv6 = false
        Port = 5001
        SSL = true
        URIPrefix = /
</Listener>

# Configure ZNC to listen on IPv6 and only web and TrustedProxy for local traffic
TrustedProxy = 127.0.0.1
<Listener listener1>
        AllowIRC = false
        AllowWeb = true
        IPv4 = false
        IPv6 = true
        Port = 5002
        SSL = false
        URIPrefix = /
</Listener>

# Make directory for certbot
sudo mkdir -p /var/www/html/znc

# Add site to nginx
server {
	listen 80;
	server_name znc.domain.com;
	location / {
		301 https://znc.domain.com;
	}
	location ~ /.well-known {
		allow all;
		root /var/www/html/znc;
	}
}
server {
	# SSL Configurations
	listen 443 ssl;
	include snippets/ssl-znc.domain.com.conf;
	include snippets/ssl-params.conf;
	# Server Declaration
	server_name znc.domain.com;
	allow <YourIPv4>; # Allow only your traffic
	deny all;         # Deny all others
	location / {
		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
		proxy_pass http://[::1]:5002/;
	}
}

# ssl-params.conf
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
ssl_ciphers "EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH";
ssl_ecdh_curve secp384r1;
ssl_session_cache shared:SSL:10m;
ssl_session_tickets off;
ssl_stapling on;
ssl_stapling_verify on;
resolver 8.8.8.8 8.8.4.4 valid=300s;
resolver_timeout 5s;
add_header Strict-Transport-Security "max-age=63072000; includeSubdomains";
add_header X-Frame-Options DENY;
add_header X-Content-Type-Options nosniff;
ssl_dhparam /etc/ssl/certs/dhparam.pem;

# ssl-znc.domain.com.conf
ssl_certificate /etc/letsencrypt/live/znc.domain.com/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/znc.domain.com/privkey.pem;

# Check config
sudo nginx -t

# Run certbot and create certificate
letsencrypt certonly --webroot -w /var/www/html/znc/ -d znc.domain.com

# Restart nginx
sudo /etc/init.d/nginx restart