Updated content

Containerfile

@@ -1,11 +1,15 @@
 FROM php:8.4.14-apache
 
 # Enable Apache modules and custom config as root during build
-RUN a2enmod rewrite
+RUN a2enmod rewrite headers
 
 COPY apache.conf /etc/apache2/conf-available/custom.conf
 RUN a2enconf custom
 
+# Override default security.conf settings
+RUN sed -i 's/^ServerTokens OS/ServerTokens Prod/' /etc/apache2/conf-available/security.conf \
+    && sed -i 's/^ServerSignature On/ServerSignature Off/' /etc/apache2/conf-available/security.conf
+
 # Log to /proc/self/fd for container output
 RUN sed -i 's|ErrorLog.*|ErrorLog /proc/self/fd/2|' /etc/apache2/sites-available/000-default.conf \
     && sed -i 's|CustomLog.*|CustomLog /proc/self/fd/1 combined|' /etc/apache2/sites-available/000-default.conf \

apache.conf

@@ -1,5 +1,13 @@
+# Minimize server version disclosure
+ServerTokens Prod
+
+# Disable PHP version header and error display
+php_flag expose_php Off
+php_flag display_errors Off
+php_flag log_errors On
+
 <Directory /var/www/>
-    Options Indexes FollowSymLinks
+    Options FollowSymLinks
     AllowOverride All
     Require all granted
 </Directory>

content/.htaccess

@@ -1,9 +1,31 @@
 DirectorySlash Off
 
+# Block direct access to content source files
+<FilesMatch "\.(ini|md|html|php)$">
+    # Allow only the entry point
+    <If "%{REQUEST_URI} != '/index.php'">
+        Require all denied
+    </If>
+</FilesMatch>
+
+# Security headers
+<IfModule mod_headers.c>
+    Header set X-Content-Type-Options "nosniff"
+    Header set X-Frame-Options "DENY"
+    Header set Referrer-Policy "strict-origin-when-cross-origin"
+    Header set Permissions-Policy "camera=(), microphone=(), geolocation=()"
+    Header unset X-Powered-By
+    Header always unset X-Powered-By
+</IfModule>
+
+# Restrict HTTP methods to GET, POST, HEAD
 <IfModule mod_rewrite.c>
     RewriteEngine On
     RewriteBase /
 
+    RewriteCond %{REQUEST_METHOD} !^(GET|POST|HEAD)$ [NC]
+    RewriteRule .* - [F,L]
+
     # Route /app requests to index.php
     RewriteCond %{REQUEST_URI} ^/app/
     RewriteRule ^(.*)$ /index.php [L,QSA]

content/.htaccess.base

@@ -1,9 +1,31 @@
 DirectorySlash Off
 
+# Block direct access to content source files
+<FilesMatch "\.(ini|md|html|php)$">
+    # Allow only the entry point
+    <If "%{REQUEST_URI} != '/index.php'">
+        Require all denied
+    </If>
+</FilesMatch>
+
+# Security headers
+<IfModule mod_headers.c>
+    Header set X-Content-Type-Options "nosniff"
+    Header set X-Frame-Options "DENY"
+    Header set Referrer-Policy "strict-origin-when-cross-origin"
+    Header set Permissions-Policy "camera=(), microphone=(), geolocation=()"
+    Header unset X-Powered-By
+    Header always unset X-Powered-By
+</IfModule>
+
+# Restrict HTTP methods to GET, POST, HEAD
 <IfModule mod_rewrite.c>
     RewriteEngine On
     RewriteBase /
 
+    RewriteCond %{REQUEST_METHOD} !^(GET|POST|HEAD)$ [NC]
+    RewriteRule .* - [F,L]
+
     # Route /app requests to index.php
     RewriteCond %{REQUEST_URI} ^/app/
     RewriteRule ^(.*)$ /index.php [L,QSA]

content/index.php

@@ -5,5 +5,12 @@ if (str_starts_with($_SERVER['REQUEST_URI'], '/app/')) {
     exit;
 }
 
+// Harden session cookie before any session starts
+ini_set('session.cookie_httponly', '1');
+ini_set('session.cookie_samesite', 'Lax');
+if (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off') {
+    ini_set('session.cookie_secure', '1');
+}
+
 // All other requests go to router
 require __DIR__ . '/../app/router.php';

docs/security-cpanel.md

@@ -0,0 +1,56 @@
+# Security Hardening — cPanel Shared Hosting
+
+The container dev environment (Containerfile + apache.conf) handles most hardening automatically. On cPanel shared hosting, some settings must be configured manually since you don't control the Apache or PHP config directly.
+
+## What's handled by .htaccess (works everywhere)
+
+These are applied automatically via `content/.htaccess` (synced from `.htaccess.base`):
+
+- Block direct access to `.ini`, `.md`, `.html`, `.php` content files
+- Security headers: `X-Content-Type-Options`, `X-Frame-Options`, `Referrer-Policy`, `Permissions-Policy`
+- Strip `X-Powered-By` header
+- Restrict HTTP methods to GET/POST/HEAD
+- Rewrite rules routing all requests through `index.php`
+
+The `custom/.htaccess` and `custom/data/.htaccess` files also deploy automatically and block direct access to config files and data.
+
+## What needs manual cPanel configuration
+
+### 1. Disable display_errors
+
+Go to **MultiPHP INI Editor** (Home > Software > MultiPHP INI Editor):
+
+- Select the domain
+- Set `display_errors` = **Off**
+- Set `log_errors` = **On**
+- Set `expose_php` = **Off**
+
+This prevents PHP errors from leaking server paths and internal details to visitors.
+
+### 2. PHP version
+
+Use **MultiPHP Manager** to ensure PHP 8.4+ is selected for the domain.
+
+### 3. Session cookie hardening
+
+Handled in `content/index.php` via `ini_set()` calls — no cPanel action needed. The entry point sets `HttpOnly`, `SameSite=Lax`, and `Secure` (when on HTTPS) before any session starts.
+
+### 4. Server version header
+
+On shared hosting you typically cannot change `ServerTokens` (it's a server-level directive). The `X-Powered-By` header is stripped by `.htaccess`, but the `Server: Apache/2.4.x` header may still show the full version. This is a low-risk issue on shared hosting since the Apache version is the hosting provider's responsibility.
+
+### 5. SSL/TLS
+
+Use **SSL/TLS** (Home > Security > SSL/TLS) or **AutoSSL** to ensure HTTPS is active. The session cookie `Secure` flag only activates over HTTPS.
+
+## Checklist
+
+- [ ] `.htaccess` deployed (copy `.htaccess.base` if needed, preserve cPanel-generated blocks)
+- [ ] `display_errors` = Off in MultiPHP INI Editor
+- [ ] `expose_php` = Off in MultiPHP INI Editor
+- [ ] `log_errors` = On in MultiPHP INI Editor
+- [ ] SSL certificate active
+- [ ] `custom/smtp-config.php` exists but is NOT in git (check `.gitignore`)
+- [ ] `custom/listmonk-config.php` exists but is NOT in git (check `.gitignore`)
+- [ ] `custom/data/` directory writable by web server (`chmod 755` or `775`)
+- [ ] `custom/data/.htaccess` present with `Require all denied`