From 5e64abf31c46bc720f27f8bf42d7b262e976da13 Mon Sep 17 00:00:00 2001
From: Egor Savkin <es@m-labs.hk>
Date: Thu, 15 Aug 2024 13:09:00 +0800
Subject: [PATCH] Limit connections and redirect www to canonical

Signed-off-by: Egor Savkin <es@m-labs.hk>
---
 m-labs-intl/m-labs-intl.com | 34 ++++++++++++++++++++++++++++------
 m-labs-intl/nginx.conf      | 33 +++++++++++++++++++++++++++++++++
 m-labs-intl/setup.md        | 25 ++++++++++++++-----------
 3 files changed, 75 insertions(+), 17 deletions(-)

diff --git a/m-labs-intl/m-labs-intl.com b/m-labs-intl/m-labs-intl.com
index b0373e5..1beb125 100644
--- a/m-labs-intl/m-labs-intl.com
+++ b/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
 }
\ No newline at end of file
diff --git a/m-labs-intl/nginx.conf b/m-labs-intl/nginx.conf
index 01fb137..a015061 100644
--- a/m-labs-intl/nginx.conf
+++ b/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;
+    }
+}
\ No newline at end of file
diff --git a/m-labs-intl/setup.md b/m-labs-intl/setup.md
index c38ac09..21429f5 100644
--- a/m-labs-intl/setup.md
+++ b/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
-cp virtual /etc/postfix/virtual
-postmap /etc/postfix/virtual
-
-cp opendkim /etc/default/opendkim
-cp opendkim.conf /etc/opendkim.conf
-opendkim-genkey -t -s mail -d m-labs-intl.com
-cp mail.private /etc/postfix/dkim.key
-service opendkim restart
-service postfix restart
+ufw default deny
+ufw allow from 94.190.212.123
+ufw allow from 2001:470:f891:1:5999:5529:5d:f71d
+ufw allow from 202.77.7.238
+ufw allow from 2001:470:18:390::2
+ufw allow "Nginx HTTP"
+ufw allow "Nginx HTTPS"
+ufw limit OpenSSH
+ufw default allow outgoing
+ufw limit 25/tcp
+ufw limit 587/tcp
+ufw show added
+ufw enable
 ```
\ No newline at end of file