user www-data;
worker_processes 1;
pid /run/nginx.pid;
pcre_jit on;
worker_rlimit_nofile 30000;
worker_shutdown_timeout 1m;
include /etc/nginx/modules-enabled/*.conf;

events {
	worker_connections 20000;
	multi_accept on;
}

http {
	##
	# Basic Settings
	##

	sendfile on;
	aio threads;
	aio_write on;
	directio 512;
	tcp_nopush on;
	tcp_nodelay on;
	keepalive_timeout 65;
	types_hash_max_size 2048;
	server_tokens off;
	client_max_body_size 10G;
	client_body_timeout 10s;
	client_header_timeout 10s;

	server_names_hash_bucket_size 128;
	server_names_hash_max_size 1024;
	server_name_in_redirect off;
	port_in_redirect off;
	charset UTF-8;
	index index.html index.htm index.php;

	include /etc/nginx/mime.types;
	default_type application/octet-stream;

	##
	# SSL Settings
	##

	ssl_protocols TLSv1.2 TLSv1.3;
	ssl_prefer_server_ciphers on;
	ssl_ecdh_curve X448:X25519:secp521r1:secp384r1;
	ssl_ciphers HIGH:!PSK:!RSA:!aNULL:!MD5:!SHA:!CAMELLIA:!AES+SHA256:!AES+SHA384;
	ssl_session_cache shared:SSL:10m;
	ssl_early_data off;
	ssl_stapling on;
	ssl_stapling_verify on;
	ssl_certificate /etc/ssl/certs/ssl-cert-snakeoil.pem;
	ssl_certificate_key /etc/ssl/private/ssl-cert-snakeoil.key;
	ssl_dhparam /etc/nginx/dh4096.pem;

	##
	# Logging Settings
	##
	log_format custom '0.0.0.0 - $remote_user [$time_local] "$request" $status $bytes_sent "$http_referer" "$http_user_agent"';
	access_log /var/log/nginx/access.log custom buffer=32k flush=1m;
	error_log /var/log/nginx/error.log notice;
	log_not_found off;

	resolver 127.0.0.1 [::1];
	resolver_timeout 2s;
	root /var/www/html;
	proxy_cache_path /var/lib/nginx/cache levels=2 keys_zone=cache:10m inactive=30d max_size=1g;
	proxy_cache_revalidate on;
	proxy_cache_use_stale http_503 timeout updating error;
	proxy_no_cache $http_pragma $http_authorization;
	proxy_cache_bypass $cookie_nocache $arg_nocache;
	map $http_upgrade $connection_upgrade {
		default upgrade;
		'' '';
	}
	proxy_cache_lock_timeout 2m;
	proxy_cache_lock_age 2m;
	proxy_cache cache;
	proxy_http_version 1.1;
	proxy_buffer_size 8k;
	proxy_buffering on;
	proxy_set_header Host $host;
	proxy_set_header Proxy "";
	proxy_set_header X-Forwarded-Proto $scheme;
	proxy_set_header X-Forwarded-Port "";
	proxy_set_header Upgrade $http_upgrade;
	proxy_set_header Connection $connection_upgrade;
	proxy_ignore_client_abort on;
	proxy_cache_key $server_name$request_method$host$request_uri;
	proxy_read_timeout 3600; #wait up to 60 minutes for e.g. database import

	##
	# Gzip Settings
	##

	gzip on;

	gzip_vary off;
	gzip_proxied off;
	gzip_comp_level 6;
	# gzip_buffers 16 8k;
	# gzip_http_version 1.1;
	gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript image/svg+xml;

	brotli on;
	brotli_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript image/svg+xml;

	##
	# Virtual Host Configs
	##

	include /etc/nginx/sites-enabled/*;
}

stream {
	ssl_protocols TLSv1.2 TLSv1.3;
	ssl_prefer_server_ciphers on;
	ssl_ecdh_curve X448:X25519:secp521r1:secp384r1:secp256k1;
	ssl_ciphers HIGH:!PSK:!RSA:!aNULL:!MD5:!SHA:!CAMELLIA:!AES+SHA256:!AES+SHA384;
	ssl_session_cache shared:SSLSTREAM:10m;
	ssl_certificate /etc/ssl/certs/ssl-cert-snakeoil.pem
	ssl_certificate_key /etc/ssl/private/ssl-cert-snakeoil.key;
	ssl_dhparam /etc/nginx/dh4096.pem;
	#smtp
	server {
		listen [::]:25 fastopen=100 ipv6only=off;
		proxy_pass smtp_backend_servers;
		deny 51.254.78.246;
	}
	server {
		listen [::]:587 fastopen=100 ipv6only=off;
		proxy_pass smtp_auth_backend_servers;
		deny 49.70.67.204;
		deny 87.246.7.212;
		deny 37.49.225.155;
		deny 103.151.123.103;
	}
	server {
		listen [::]:465 fastopen=100 ipv6only=off;
		proxy_pass smtps_backend_servers;
	}
	#mysql
	server {
		listen 127.0.0.1:3306 fastopen=100;
		proxy_pass mysql_backend_servers;
	}
	#imap
	server {
		listen [::]:143 fastopen=100 ipv6only=off;
		proxy_pass imap_backend_servers;
	}
	server {
		listen [::]:993 fastopen=100 ipv6only=off;
		proxy_pass imaps_backend_servers;
	}
	#pop3
	server {
		listen [::]:110 fastopen=100 ipv6only=off;
		proxy_pass pop3_backend_servers;
	}
	server {
		listen [::]:995 fastopen=100 ipv6only=off;
		proxy_pass pop3s_backend_servers;
	}
	#xmpp
	server {
		listen [::]:5269 fastopen=100 ipv6only=off;
		proxy_pass 10.9.0.3:5269;
	}
	server {
		listen [::]:5000 fastopen=100 ipv6only=off;
		proxy_pass 10.9.0.3:5000;
	}
	server {
		listen [::]:5222 fastopen=100 ipv6only=off;
		proxy_pass 10.9.0.3:5222;
	}
	server {
		listen [::]:5223 fastopen=100 ipv6only=off;
		proxy_pass 10.9.0.3:5223;
	}
	server {
		listen [::]:5280 fastopen=100 ipv6only=off;
		proxy_pass 10.9.0.3:5280;
	}
	server {
		listen [::]:5281 fastopen=100 ipv6only=off;
		proxy_pass 10.9.0.3:5281;
	}
	#https
	server {
		listen [::]:443 fastopen=100 ipv6only=off;
#		limit_conn addr 2;
#		proxy_upload_rate 4k;
		proxy_protocol on;
		proxy_pass https_backend_servers;
	}
	#upstream servers
	upstream https_backend_servers {
		server 10.9.0.2:443;
		server 10.9.0.3:443;
		server 10.9.0.4:443;
		server 10.9.0.5:443;
	}
	upstream imaps_backend_servers {
		server 10.9.0.2:993;
		server 10.9.0.3:993;
		server 10.9.0.4:993;
		server 10.9.0.5:993;
	}
	upstream imap_backend_servers {
		server 10.9.0.2:143;
		server 10.9.0.3:143;
		server 10.9.0.4:143;
		server 10.9.0.5:143;
	}
	upstream pop3s_backend_servers {
		server 10.9.0.2:995;
		server 10.9.0.3:995;
		server 10.9.0.4:995;
		server 10.9.0.5:995;
	}
	upstream pop3_backend_servers {
		server 10.9.0.2:110;
		server 10.9.0.3:110;
		server 10.9.0.4:110;
		server 10.9.0.5:110;
	}
	upstream dns_backend_server {
		server [::1]:53;
		server 127.0.0.1:53;
	}
	upstream smtp_backend_servers {
		server 10.9.0.2:25;
		server 10.9.0.3:25;
		server 10.9.0.4:25;
		server 10.9.0.5:25;
	}
	upstream smtp_auth_backend_servers {
		server 10.9.0.2:587;
		server 10.9.0.3:587;
		server 10.9.0.4:587;
		server 10.9.0.5:587;
	}
	upstream smtps_backend_servers {
		server 10.9.0.2:465;
		server 10.9.0.3:465;
		server 10.9.0.4:465;
		server 10.9.0.5:465;
	}
	upstream mysql_backend_servers {
		server 10.9.0.2:3306;
		server 10.9.0.3:3306;
		server 10.9.0.4:3306;
		server 10.9.0.5:3306;
	}
}