Limit connections and redirect www to canonical

Signed-off-by: Egor Savkin <es@m-labs.hk>

m-labs-intl/m-labs-intl.com

@@ -3,13 +3,15 @@ upstream rfq_server {
 }
 
 server {
+    limit_conn addr 5;
+
     root /var/www/m-labs-intl.com/html;
     index index.html index.htm index.nginx-debian.html;
 
-    server_name m-labs-intl.com www.m-labs-intl.com;
+    server_name m-labs-intl.com;
 
     location / {
-            try_files $uri $uri/ =404;
+        try_files $uri $uri/ =404;
     }
 
     listen [::]:443 ssl ipv6only=on; # managed by Certbot
@@ -20,8 +22,22 @@ server {
     ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
 }
 
+server {
+    server_name www.m-labs-intl.com;
+    return 301 https://m-labs-intl.com$request_uri;
+
+    listen [::]:443 ssl; # managed by Certbot
+    listen 443 ssl; # managed by Certbot
+    ssl_certificate /etc/letsencrypt/live/m-labs-intl.com/fullchain.pem; # managed by Certbot
+    ssl_certificate_key /etc/letsencrypt/live/m-labs-intl.com/privkey.pem; # managed by Certbot
+    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
+    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
+}
+
 server {
     server_name hooks.m-labs-intl.com;
+    limit_conn addr 1;
+    limit_req zone=rfq;
 
     location /rfq {
         proxy_pass http://rfq_server/rfq;
@@ -35,9 +51,10 @@ server {
     }
 
     location / {
-        return 404;
+        return 418;
     }
 
+    listen [::]:443 ssl; # managed by Certbot
     listen 443 ssl; # managed by Certbot
     ssl_certificate /etc/letsencrypt/live/m-labs-intl.com/fullchain.pem; # managed by Certbot
     ssl_certificate_key /etc/letsencrypt/live/m-labs-intl.com/privkey.pem; # managed by Certbot
@@ -46,15 +63,20 @@ server {
 }
 
 server {
-    if ($host = www.m-labs-intl.com) {
+    limit_conn addr 1;
+    if ($host = m-labs-intl.com) {
         return 301 https://$host$request_uri;
     } # managed by Certbot
 
 
+    if ($host = www.m-labs-intl.com) {
+        return 301 https://m-labs-intl.com$request_uri;
+    } # managed by Certbot
+
+
     listen 80;
     listen [::]:80;
 
-    server_name m-labs-intl.com www.m-labs-intl.com;
+    server_name m-labs-intl.com www.m-labs-intl.com hooks.m-labs-intl.com;
     return 301 https://$host$request_uri;
-    #return 404; # managed by Certbot
 }

m-labs-intl/nginx.conf

@@ -33,6 +33,10 @@ http {
 	ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3; # Dropping SSLv3, ref: POODLE
 	ssl_prefer_server_ciphers on;
 
+	# Rate limiting
+	limit_conn_zone $binary_remote_addr zone=addr:10m;
+	limit_req_zone $binary_remote_addr zone=rfq:10m rate=5r/m;
+
 	##
 	# Logging Settings
 	##
@@ -59,3 +63,32 @@ http {
 	include /etc/nginx/conf.d/*.conf;
 	include /etc/nginx/sites-enabled/*;
 }
+
+
+stream {
+	limit_conn_zone $binary_remote_addr zone=mail:10m;
+    # Upstream mail servers
+    upstream smtp_backend {
+        server mail.m-labs.hk:25;
+    }
+
+    upstream submission_backend {
+        server mail.m-labs.hk:587;
+    }
+
+    # SMTP
+    server {
+        listen 25;
+        proxy_pass smtp_backend;
+        proxy_protocol on;
+        limit_conn mail 5;
+    }
+
+    # Submission (Authenticated SMTP)
+    server {
+        listen 587;
+        proxy_pass submission_backend;
+        proxy_protocol on;
+        limit_conn mail 5;
+    }
+}

m-labs-intl/setup.md

@@ -1,7 +1,7 @@
 # Setup m-labs-intl.com server
 
 ```shell
-apt install git nginx-full python3 python3.12-venv python3-pip postfix opendkim opendkim-tools
+apt install git nginx-full python3 python3.12-venv python3-pip
 snap install --classic certbot
 ln -s /snap/bin/certbot /usr/bin/certbot
 useradd -m rfqserver
@@ -51,14 +51,17 @@ certbot --nginx
 
 service nginx restart
 
-cp main.cf /etc/postfix/main.cf
+ufw default deny
-cp virtual /etc/postfix/virtual
+ufw allow from 94.190.212.123
-postmap /etc/postfix/virtual
+ufw allow from 2001:470:f891:1:5999:5529:5d:f71d
-
+ufw allow from 202.77.7.238
-cp opendkim /etc/default/opendkim
+ufw allow from 2001:470:18:390::2
-cp opendkim.conf /etc/opendkim.conf
+ufw allow "Nginx HTTP"
-opendkim-genkey -t -s mail -d m-labs-intl.com
+ufw allow "Nginx HTTPS"
-cp mail.private /etc/postfix/dkim.key
+ufw limit OpenSSH
-service opendkim restart
+ufw default allow outgoing
-service postfix restart
+ufw limit 25/tcp
+ufw limit 587/tcp
+ufw show added
+ufw enable
 ```

nixbld-etc-nixos/configuration.nix

@@ -1173,11 +1173,10 @@ in
     enable = true;
     localDnsResolver = false;  # conflicts with dnsmasq
     fqdn = "mail.m-labs.hk";
-    domains = [ "m-labs.hk" "m-labs.ph" "193thz.com" "malloctech.fr" ];
+    domains = [ "m-labs.hk" "m-labs.ph" "m-labs-intl.com" "193thz.com" "malloctech.fr" ];
     enablePop3 = true;
     enablePop3Ssl = true;
     certificateScheme = "acme-nginx";
-    rejectSender = [ "sapcloudsupport@alerts.ondemand.com" ];
   } // (import /etc/nixos/secret/email_settings.nix);
   services.roundcube = {
     enable = true;

nixbld-etc-nixos/named/m-labs-intl.com

@@ -1,7 +1,7 @@
 $TTL 7200
 
 @						SOA	ns.m-labs-intl.com. sb.m-labs.hk. (
-							2024060601
+							2024081402
 							7200
 							3600
 							86400
@@ -13,8 +13,17 @@ $TTL 7200
 
 						A		5.78.86.156
 						AAAA	2a01:4ff:1f0:83de::1
+						MX		10 mail.m-labs-intl.com.
+						TXT		"v=spf1 mx -all"
+						TXT		"google-site-verification=BlQd5_5wWW7calKC7bZA0GdoxR8-zj4gwJEg9sGJ3l8"
 
 ns						A		94.190.212.123
 ns						AAAA	2001:470:18:390::2
 
+mail					A		5.78.86.156
+mail					AAAA	2a01:4ff:1f0:83de::1
+mail._domainkey			IN	TXT	"v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDJVPuhSGXghO7ib8Em/Se3jfCCIJK5g4zn5pGZ3/e0I0f+zGHMuvwpjkAKf6eSmo/AAXEaco28pDi3qE5xfV512AJsORCfPoPFyNhLsj/qtri6hc5KVSWW0Ja3MSFBINDCaX78c7PXPY+3jJJGpwSBDLjdxj9AQwtfiCVlH4qE/QIDAQAB"
+_dmarc					TXT		"v=DMARC1; p=none"
+
 www						CNAME	@
+hooks					CNAME	@