load_module /usr/lib/nginx/modules/ngx_stream_module.so;
user www-data;
worker_processes auto;
pid /run/nginx.pid;

events {
        worker_connections 2048;
        multi_accept on;
        use epoll;
}http {

	##
	# Basic Settings
	##

        sendfile on;
        tcp_nopush on;
        tcp_nodelay on;
        keepalive_timeout 65;
        keepalive_requests 100;
        reset_timedout_connection on;
        types_hash_max_size 2048;
        # server_tokens off;
        
        # File cache for better performance
        open_file_cache max=10000 inactive=30s;
        open_file_cache_valid 60s;
        open_file_cache_min_uses 2;
        open_file_cache_errors on;	# server_names_hash_bucket_size 64;
	# server_name_in_redirect off;

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

	##
	# SSL Settings
	##

	ssl_protocols TLSv1.2 TLSv1.3; # Dropping SSLv3, ref: POODLE
	ssl_prefer_server_ciphers on;
	ssl_ciphers 'EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH';
	ssl_session_cache shared:SSL:50m;
	ssl_session_timeout 1d;
    ssl_session_tickets off;
	ssl_ecdh_curve secp521r1:secp384r1:prime256v1;
	#ssl_stapling on;
	#ssl_stapling_verify on;
	##
	# Logging Settings
	##

	access_log /var/log/nginx/access.log;
	error_log /var/log/nginx/error.log;

	##
	# Gzip Settings
	##

	gzip on;
	gzip_disable "msie6";

	 gzip_vary on;
	 gzip_proxied any;
	 gzip_comp_level 5;
	 gzip_buffers 16 8k;
	 gzip_http_version 1.1;

    # Proxy buffer settings
    proxy_buffers 16 16k;
    proxy_buffer_size 32k;
    proxy_busy_buffers_size 64k;
    proxy_temp_file_write_size 64k;
    proxy_connect_timeout 90;
    proxy_send_timeout 90;
    proxy_read_timeout 90;
	 gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

	##
	# Virtual Host Configs
	##

	include /etc/nginx/conf.d/*.conf;
	include /etc/nginx/sites-enabled/*;
}


#mail {
#       # See sample authentication script at:
#       # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
#
#       # auth_http localhost/auth.php;
#       # pop3_capabilities "TOP" "USER";
#       # imap_capabilities "IMAP4rev1" "UIDPLUS";
#
#       server {
#               listen     localhost:110;
#               protocol   pop3;
#               proxy      on;
#       }
#
#       server {
#               listen     localhost:143;
#               protocol   imap;
#               proxy      on;
#       }
#}

# Stream block for SMTP proxy with Let's Encrypt TLS termination
stream {
    # Logging
    log_format smtp_proxy '$remote_addr [$time_local] $protocol $status $bytes_sent $bytes_received $session_time';
    
    # Upstream mail server
    upstream mail_submission {
        server 10.0.0.21:587;
    }
    
    upstream mail_smtps {
        server 10.0.0.21:465;
    }
    
    # SMTP Submission port (STARTTLS) - port 587
    server {
        listen 10.0.0.29:587 ssl;
        proxy_pass mail_submission;
        proxy_connect_timeout 10s;
        
        # Let's Encrypt SSL certificate
        ssl_certificate /etc/letsencrypt/live/owa.egonetix.de/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/owa.egonetix.de/privkey.pem;
        
        # SSL settings
        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers HIGH:!aNULL:!MD5;
        ssl_prefer_server_ciphers on;
        ssl_session_cache shared:SMTP:10m;
        ssl_session_timeout 10m;
        
        access_log /var/log/nginx/mail-submission-access.log smtp_proxy;
        error_log /var/log/nginx/mail-submission-error.log;
    }
    
    # SMTPS port (implicit TLS) - port 465
    server {
        listen 10.0.0.29:465 ssl;
        proxy_pass mail_smtps;
        proxy_connect_timeout 10s;
        
        # Let's Encrypt SSL certificate
        ssl_certificate /etc/letsencrypt/live/owa.egonetix.de/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/owa.egonetix.de/privkey.pem;
        
        # SSL settings
        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers HIGH:!aNULL:!MD5;
        ssl_prefer_server_ciphers on;
        ssl_session_cache shared:SMTPS:10m;
        ssl_session_timeout 10m;
        
        access_log /var/log/nginx/mail-smtps-access.log smtp_proxy;
        error_log /var/log/nginx/mail-smtps-error.log;
    }
}