diff --git a/data/web/inc/lib/composer.json b/data/web/inc/lib/composer.json
index d811958b..7adb5ca0 100644
--- a/data/web/inc/lib/composer.json
+++ b/data/web/inc/lib/composer.json
@@ -1,6 +1,7 @@
 {
     "require": {
         "robthree/twofactorauth": "^1.6",
-        "yubico/u2flib-server": "^1.0"
+        "yubico/u2flib-server": "^1.0",
+        "owasp/csrf-protector-php": "dev-master"
     }
 }
diff --git a/data/web/inc/lib/composer.lock b/data/web/inc/lib/composer.lock
index 692521d2..d0f94fc4 100644
--- a/data/web/inc/lib/composer.lock
+++ b/data/web/inc/lib/composer.lock
@@ -4,8 +4,44 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "5652a086b6d277d72d7ae0341e517b1e",
+    "content-hash": "413fc63dc6c7815f0a175217bccb490a",
     "packages": [
+        {
+            "name": "owasp/csrf-protector-php",
+            "version": "dev-master",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/mebjas/CSRF-Protector-PHP.git",
+                "reference": "aec0d6966992363a7192b2ae9fb0a9643e8fa26b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/mebjas/CSRF-Protector-PHP/zipball/aec0d6966992363a7192b2ae9fb0a9643e8fa26b",
+                "reference": "aec0d6966992363a7192b2ae9fb0a9643e8fa26b",
+                "shasum": ""
+            },
+            "require-dev": {
+                "satooshi/php-coveralls": "~1.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "libs/csrf/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "APACHE"
+            ],
+            "description": "CSRF protector php, a standalone php library for csrf mitigation in web applications. Easy to integrate in any php web app.",
+            "homepage": "https://github.com/mebjas/CSRF-Protector-PHP",
+            "keywords": [
+                "csrf",
+                "owasp",
+                "security"
+            ],
+            "time": "2017-04-12 05:47:07"
+        },
         {
             "name": "robthree/twofactorauth",
             "version": "1.6",
@@ -92,7 +128,9 @@
     "packages-dev": [],
     "aliases": [],
     "minimum-stability": "stable",
-    "stability-flags": [],
+    "stability-flags": {
+        "owasp/csrf-protector-php": 20
+    },
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": [],
diff --git a/data/web/inc/lib/vendor/composer/autoload_classmap.php b/data/web/inc/lib/vendor/composer/autoload_classmap.php
index 44393069..b62afd4e 100644
--- a/data/web/inc/lib/vendor/composer/autoload_classmap.php
+++ b/data/web/inc/lib/vendor/composer/autoload_classmap.php
@@ -6,6 +6,14 @@ $vendorDir = dirname(dirname(__FILE__));
 $baseDir = dirname($vendorDir);
 
 return array(
+    'alreadyInitializedException' => $vendorDir . '/owasp/csrf-protector-php/libs/csrf/csrfprotector.php',
+    'baseJSFileNotFoundExceptio' => $vendorDir . '/owasp/csrf-protector-php/libs/csrf/csrfprotector.php',
+    'configFileNotFoundException' => $vendorDir . '/owasp/csrf-protector-php/libs/csrf/csrfprotector.php',
+    'csrfProtector' => $vendorDir . '/owasp/csrf-protector-php/libs/csrf/csrfprotector.php',
+    'incompleteConfigurationException' => $vendorDir . '/owasp/csrf-protector-php/libs/csrf/csrfprotector.php',
+    'jsFileNotFoundException' => $vendorDir . '/owasp/csrf-protector-php/libs/csrf/csrfprotector.php',
+    'logDirectoryNotFoundException' => $vendorDir . '/owasp/csrf-protector-php/libs/csrf/csrfprotector.php',
+    'logFileWriteError' => $vendorDir . '/owasp/csrf-protector-php/libs/csrf/csrfprotector.php',
     'u2flib_server\\Error' => $vendorDir . '/yubico/u2flib-server/src/u2flib_server/U2F.php',
     'u2flib_server\\RegisterRequest' => $vendorDir . '/yubico/u2flib-server/src/u2flib_server/U2F.php',
     'u2flib_server\\Registration' => $vendorDir . '/yubico/u2flib-server/src/u2flib_server/U2F.php',
diff --git a/data/web/inc/lib/vendor/composer/autoload_static.php b/data/web/inc/lib/vendor/composer/autoload_static.php
index 5e2dabab..d6d62685 100644
--- a/data/web/inc/lib/vendor/composer/autoload_static.php
+++ b/data/web/inc/lib/vendor/composer/autoload_static.php
@@ -21,6 +21,14 @@ class ComposerStaticInit873464e4bd965a3168f133248b1b218b
     );
 
     public static $classMap = array (
+        'alreadyInitializedException' => __DIR__ . '/..' . '/owasp/csrf-protector-php/libs/csrf/csrfprotector.php',
+        'baseJSFileNotFoundExceptio' => __DIR__ . '/..' . '/owasp/csrf-protector-php/libs/csrf/csrfprotector.php',
+        'configFileNotFoundException' => __DIR__ . '/..' . '/owasp/csrf-protector-php/libs/csrf/csrfprotector.php',
+        'csrfProtector' => __DIR__ . '/..' . '/owasp/csrf-protector-php/libs/csrf/csrfprotector.php',
+        'incompleteConfigurationException' => __DIR__ . '/..' . '/owasp/csrf-protector-php/libs/csrf/csrfprotector.php',
+        'jsFileNotFoundException' => __DIR__ . '/..' . '/owasp/csrf-protector-php/libs/csrf/csrfprotector.php',
+        'logDirectoryNotFoundException' => __DIR__ . '/..' . '/owasp/csrf-protector-php/libs/csrf/csrfprotector.php',
+        'logFileWriteError' => __DIR__ . '/..' . '/owasp/csrf-protector-php/libs/csrf/csrfprotector.php',
         'u2flib_server\\Error' => __DIR__ . '/..' . '/yubico/u2flib-server/src/u2flib_server/U2F.php',
         'u2flib_server\\RegisterRequest' => __DIR__ . '/..' . '/yubico/u2flib-server/src/u2flib_server/U2F.php',
         'u2flib_server\\Registration' => __DIR__ . '/..' . '/yubico/u2flib-server/src/u2flib_server/U2F.php',
diff --git a/data/web/inc/lib/vendor/composer/installed.json b/data/web/inc/lib/vendor/composer/installed.json
index bbe76d82..fa07bcd4 100644
--- a/data/web/inc/lib/vendor/composer/installed.json
+++ b/data/web/inc/lib/vendor/composer/installed.json
@@ -84,5 +84,43 @@
         ],
         "description": "Library for U2F implementation",
         "homepage": "https://developers.yubico.com/php-u2flib-server"
+    },
+    {
+        "name": "owasp/csrf-protector-php",
+        "version": "dev-master",
+        "version_normalized": "9999999-dev",
+        "source": {
+            "type": "git",
+            "url": "https://github.com/mebjas/CSRF-Protector-PHP.git",
+            "reference": "aec0d6966992363a7192b2ae9fb0a9643e8fa26b"
+        },
+        "dist": {
+            "type": "zip",
+            "url": "https://api.github.com/repos/mebjas/CSRF-Protector-PHP/zipball/aec0d6966992363a7192b2ae9fb0a9643e8fa26b",
+            "reference": "aec0d6966992363a7192b2ae9fb0a9643e8fa26b",
+            "shasum": ""
+        },
+        "require-dev": {
+            "satooshi/php-coveralls": "~1.0"
+        },
+        "time": "2017-04-12T05:47:07+00:00",
+        "type": "library",
+        "installation-source": "source",
+        "autoload": {
+            "classmap": [
+                "libs/csrf/"
+            ]
+        },
+        "notification-url": "https://packagist.org/downloads/",
+        "license": [
+            "APACHE"
+        ],
+        "description": "CSRF protector php, a standalone php library for csrf mitigation in web applications. Easy to integrate in any php web app.",
+        "homepage": "https://github.com/mebjas/CSRF-Protector-PHP",
+        "keywords": [
+            "csrf",
+            "owasp",
+            "security"
+        ]
     }
 ]
diff --git a/data/web/inc/lib/vendor/owasp/csrf-protector-php b/data/web/inc/lib/vendor/owasp/csrf-protector-php
new file mode 160000
index 00000000..aec0d696
--- /dev/null
+++ b/data/web/inc/lib/vendor/owasp/csrf-protector-php
@@ -0,0 +1 @@
+Subproject commit aec0d6966992363a7192b2ae9fb0a9643e8fa26b
diff --git a/data/web/inc/prerequisites.inc.php b/data/web/inc/prerequisites.inc.php
index 76ed81ee..902b46af 100644
--- a/data/web/inc/prerequisites.inc.php
+++ b/data/web/inc/prerequisites.inc.php
@@ -1,20 +1,5 @@
 <?php
-//ini_set("session.cookie_secure", 1);
-//ini_set("session.cookie_httponly", 1);
-session_start();
-if (isset($_POST["logout"])) {
-  if (isset($_SESSION["dual-login"])) {
-    $_SESSION["mailcow_cc_username"] = $_SESSION["dual-login"]["username"];
-    $_SESSION["mailcow_cc_role"] = $_SESSION["dual-login"]["role"];
-    unset($_SESSION["dual-login"]);
-  }
-  else {
-    session_unset();
-    session_destroy();
-    session_write_close();
-    setcookie(session_name(),'',0,'/');
-  }
-}
+require_once 'inc/sessions.inc.php';
 
 require_once 'inc/vars.inc.php';
 if (file_exists('./inc/vars.local.inc.php')) {
@@ -24,11 +9,25 @@ if (file_exists('./inc/vars.local.inc.php')) {
 // Yubi OTP API
 require_once 'inc/lib/Yubico.php';
 
-// U2F API + T/HOTP API
+// Autoload composer
 require_once 'inc/lib/vendor/autoload.php';
-$u2f = new u2flib_server\U2F('https://' . $_SERVER['SERVER_NAME']);
+
+// U2F API + T/HOTP API
+$u2f = new u2flib_server\U2F('https://' . $_SERVER['HTTP_HOST']);
 $tfa = new RobThree\Auth\TwoFactorAuth('mailcow UI');
 
+// OWASP CSRF Protector
+$csrfProtector = new csrfProtector;
+class mailcowCsrfProtector extends csrfprotector {
+  public static function logCSRFattack() {
+    $_SESSION['return'] = array(
+      'type' => 'danger',
+      'msg' => 'CSRF violation'
+    );
+  }
+}
+mailcowCsrfProtector::init();
+
 // Redis
 $redis = new Redis();
 $redis->connect('redis-mailcow', 6379);
diff --git a/data/web/inc/sessions.inc.php b/data/web/inc/sessions.inc.php
new file mode 100644
index 00000000..e6beb485
--- /dev/null
+++ b/data/web/inc/sessions.inc.php
@@ -0,0 +1,58 @@
+<?php
+// Start session
+ini_set("session.cookie_httponly", 1);
+if (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && 
+  strtolower($_SERVER['HTTP_X_FORWARDED_PROTO']) == "https") {
+  ini_set("session.cookie_secure", 1);
+  $IS_HTTPS = true;
+}
+elseif (isset($_SERVER['HTTPS'])) {
+  ini_set("session.cookie_secure", 1);
+  $IS_HTTPS = true;
+}
+else {
+  $IS_HTTPS = false;
+}
+session_set_cookie_params($GLOBALS['SESSION_LIFETIME'], '/', $_SERVER['SERVER_NAME'], $IS_HTTPS, true);
+session_start();
+
+// Handle logouts
+if (isset($_POST["logout"])) {
+  if (isset($_SESSION["dual-login"])) {
+    $_SESSION["mailcow_cc_username"] = $_SESSION["dual-login"]["username"];
+    $_SESSION["mailcow_cc_role"] = $_SESSION["dual-login"]["role"];
+    unset($_SESSION["dual-login"]);
+  }
+  else {
+    session_regenerate_id(true);
+    session_unset();
+    session_destroy();
+    session_write_close();
+    header("Location: /");
+  }
+}
+
+// Set session IP and UA
+if (!isset($_SESSION['SESS_REMOTE_IP'])) {
+  $_SESSION['SESS_REMOTE_IP'] = $_SERVER['REMOTE_ADDR'];
+}
+if (!isset($_SESSION['SESS_REMOTE_UA'])) {
+  $_SESSION['SESS_REMOTE_UA'] = $_SERVER['HTTP_USER_AGENT'];
+}
+
+// Check session
+function session_check() {
+  if (!isset($_SESSION['SESS_REMOTE_IP']) || !isset($_SESSION['SESS_REMOTE_UA'])) {
+    return false;
+  }
+  if ($_SESSION['SESS_REMOTE_IP'] != $_SERVER['REMOTE_ADDR']) {
+    return false;
+  }
+  if ($_SESSION['SESS_REMOTE_UA'] != $_SERVER['HTTP_USER_AGENT']) {
+    return false;
+  }
+  return true;
+}
+if (isset($_SESSION['mailcow_cc_role']) && session_check() === false) {
+  exit("Invalid session");
+}
diff --git a/data/web/inc/vars.inc.php b/data/web/inc/vars.inc.php
index 6666d58c..faef565d 100644
--- a/data/web/inc/vars.inc.php
+++ b/data/web/inc/vars.inc.php
@@ -53,5 +53,7 @@ $MAILCOW_APPS = array(
 // Rows until pagination begins
 $PAGINATION_SIZE = 10;
 
+// Session lifetime in seconds
+$SESSION_LIFETIME = 3600;
 
 ?>