A more secure and generalized approach for PDO Basic Auth Backend

lib/DAV/Auth/Backend/PDOBasicAuth.php

@@ -0,0 +1,102 @@
+<?php
+
+namespace Sabre\DAV\Auth\Backend;
+
+/**
+ * This is an authentication backend that uses a database to manage passwords.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class PDOBasicAuth extends AbstractBasic
+{
+    /**
+     * Reference to PDO connection.
+     *
+     * @var PDO
+     */
+    protected $pdo;
+
+    /**
+     * PDO table name we'll be using.
+     *
+     * @var string
+     */
+    protected $tableName;
+
+    /**
+     * PDO digest column name we'll be using
+     * (i.e. digest, password, password_hash).
+     *
+     * @var string
+     */
+    protected $digestColumn;
+
+    /**
+     * Digest prefix:
+     * if the backend you are using for is prefixing
+     * your password hashes set this option to your prefix to
+     * cut it off before verfiying.
+     *
+     * @var string
+     */
+    protected $digestPrefix;
+
+    /**
+     * Creates the backend object.
+     *
+     * If the filename argument is passed in, it will parse out the specified file fist.
+     */
+    public function __construct(\PDO $pdo, array $options = [])
+    {
+        $this->pdo = $pdo;
+        if (isset($options['tableName'])) {
+            $this->tableName = $options['tableName'];
+        } else {
+            $this->tableName = 'user';
+        }
+        if (isset($options['digestColumn'])) {
+            $this->digestColumn = $options['digestColumn'];
+        } else {
+            $this->digestColumn = 'digest';
+        }
+        if (isset($options['digestPrefix'])) {
+            $this->digestPrefix = $options['digestPrefix'];
+        }
+    }
+
+    /**
+     * Validates a username and password.
+     *
+     * This method should return true or false depending on if login
+     * succeeded.
+     *
+     * @param string $username
+     * @param string $password
+     *
+     * @return bool
+     */
+    public function validateUserPass($username, $password)
+    {
+        $stmt = $this->pdo->prepare('SELECT '.$this->digestColumn.' FROM '.$this->tableName.' WHERE email = ?');
+        $stmt->execute([$username]);
+        $result = $stmt->fetchAll();
+
+        if (!count($result)) {
+            return false;
+        }
+
+        $digest = $result[0]['password'];
+
+        if (isset($this->digestPrefix)) {
+            $digest = substr($digest, strlen($this->digestPrefix));
+        }
+
+        if (password_verify($password, $digest)) {
+            return true;
+        }
+
+        return false;
+    }
+}