1 files changed, 67 insertions, 0 deletions
diff --git a/app/Core/Security/Token.php b/app/Core/Security/Token.php
new file mode 100644
index 00000000..7aca08af
--- /dev/null
+++ b/app/Core/Security/Token.php
@@ -0,0 +1,67 @@
+<?php
+
+namespace Kanboard\Core\Security;
+
+use Kanboard\Core\Base;
+
+/**
+ * Token Handler
+ *
+ * @package  security
+ * @author   Frederic Guillot
+ */
+class Token extends Base
+{
+    /**
+     * Generate a random token with different methods: openssl or /dev/urandom or fallback to uniqid()
+     *
+     * @static
+     * @access public
+     * @return string  Random token
+     */
+    public static function getToken()
+    {
+        if (function_exists('openssl_random_pseudo_bytes')) {
+            return bin2hex(\openssl_random_pseudo_bytes(30));
+        } elseif (ini_get('open_basedir') === '' && strtoupper(substr(PHP_OS, 0, 3)) !== 'WIN') {
+            return hash('sha256', file_get_contents('/dev/urandom', false, null, 0, 30));
+        }
+
+        return hash('sha256', uniqid(mt_rand(), true));
+    }
+
+    /**
+     * Generate and store a CSRF token in the current session
+     *
+     * @access public
+     * @return string  Random token
+     */
+    public function getCSRFToken()
+    {
+        if (! isset($_SESSION['csrf_tokens'])) {
+            $_SESSION['csrf_tokens'] = array();
+        }
+
+        $nonce = self::getToken();
+        $_SESSION['csrf_tokens'][$nonce] = true;
+
+        return $nonce;
+    }
+
+    /**
+     * Check if the token exists for the current session (a token can be used only one time)
+     *
+     * @access public
+     * @param  string   $token   CSRF token
+     * @return bool
+     */
+    public function validateCSRFToken($token)
+    {
+        if (isset($_SESSION['csrf_tokens'][$token])) {
+            unset($_SESSION['csrf_tokens'][$token]);
+            return true;
+        }
+
+        return false;
+    }
+}