From abeeba71672a711dab98194bb8ae751ee95e3385 Mon Sep 17 00:00:00 2001
From: Frederic Guillot <fred@kanboard.net>
Date: Tue, 31 Mar 2015 22:48:14 -0400
Subject: Add two factor authentication

---
 app/Controller/Base.php      |  21 +++++++
 app/Controller/Twofactor.php | 137 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 158 insertions(+)
 create mode 100644 app/Controller/Twofactor.php

(limited to 'app/Controller')

diff --git a/app/Controller/Base.php b/app/Controller/Base.php
index 6420e0ee..f498c3ce 100644
--- a/app/Controller/Base.php
+++ b/app/Controller/Base.php
@@ -176,6 +176,7 @@ abstract class Base
 
         if (! $this->acl->isPublicAction($controller, $action)) {
             $this->handleAuthentication();
+            $this->handle2FA($controller, $action);
             $this->handleAuthorization($controller, $action);
 
             $this->session['has_subtask_inprogress'] = $this->subtask->hasSubtaskInProgress($this->userSession->getId());
@@ -199,6 +200,26 @@ abstract class Base
         }
     }
 
+    /**
+     * Check 2FA
+     *
+     * @access public
+     */
+    public function handle2FA($controller, $action)
+    {
+        $controllers = array('twofactor', 'user');
+        $actions = array('code', 'check', 'logout');
+
+        if ($this->userSession->has2FA() && ! $this->userSession->check2FA() && ! in_array($controller, $controllers) && ! in_array($action, $actions)) {
+
+            if ($this->request->isAjax()) {
+                $this->response->text('Not Authorized', 401);
+            }
+
+            $this->response->redirect($this->helper->url('twofactor', 'code', array('user_id' => $user['id'])));
+        }
+    }
+
     /**
      * Check page access and authorization
      *
diff --git a/app/Controller/Twofactor.php b/app/Controller/Twofactor.php
new file mode 100644
index 00000000..7711666b
--- /dev/null
+++ b/app/Controller/Twofactor.php
@@ -0,0 +1,137 @@
+<?php
+
+namespace Controller;
+
+use Otp\Otp;
+use Otp\GoogleAuthenticator;
+use Base32\Base32;
+
+/**
+ * Two Factor Auth controller
+ *
+ * @package  controller
+ * @author   Frederic Guillot
+ */
+class Twofactor extends User
+{
+    /**
+     * Only the current user can access to 2FA settings
+     *
+     * @access private
+     */
+    private function checkCurrentUser(array $user)
+    {
+        if ($user['id'] != $this->userSession->getId()) {
+            $this->forbidden();
+        }
+    }
+
+    /**
+     * Index
+     *
+     * @access public
+     */
+    public function index()
+    {
+        $user = $this->getUser();
+        $this->checkCurrentUser($user);
+
+        $label = $user['email'] ?: $user['username'];
+
+        $this->response->html($this->layout('twofactor/index', array(
+            'user' => $user,
+            'qrcode_url' => $user['twofactor_activated'] == 1 ? GoogleAuthenticator::getQrCodeUrl('totp', $label, $user['twofactor_secret']) : '',
+            'key_url' => $user['twofactor_activated'] == 1 ? GoogleAuthenticator::getKeyUri('totp', $label, $user['twofactor_secret']) : '',
+        )));
+    }
+
+    /**
+     * Enable/disable 2FA
+     *
+     * @access public
+     */
+    public function save()
+    {
+        $user = $this->getUser();
+        $this->checkCurrentUser($user);
+
+        $values = $this->request->getValues();
+
+        if (isset($values['twofactor_activated']) && $values['twofactor_activated'] == 1) {
+            $this->user->update(array(
+                'id' => $user['id'],
+                'twofactor_activated' => 1,
+                'twofactor_secret' => GoogleAuthenticator::generateRandom(),
+            ));
+        }
+        else {
+            $this->user->update(array(
+                'id' => $user['id'],
+                'twofactor_activated' => 0,
+                'twofactor_secret' => '',
+            ));
+        }
+
+        $this->session->flash(t('User updated successfully.'));
+        $this->response->redirect($this->helper->url('twofactor', 'index', array('user_id' => $user['id'])));
+    }
+
+    /**
+     * Test 2FA
+     *
+     * @access public
+     */
+    public function test()
+    {
+        $user = $this->getUser();
+        $this->checkCurrentUser($user);
+
+        $otp = new Otp;
+        $values = $this->request->getValues();
+
+        if (! empty($values['code']) && $otp->checkTotp(Base32::decode($user['twofactor_secret']), $values['code'])) {
+            $this->session->flash(t('The two factor authentication code is valid.'));
+        }
+        else {
+            $this->session->flashError(t('The two factor authentication code is not valid.'));
+        }
+
+        $this->response->redirect($this->helper->url('twofactor', 'index', array('user_id' => $user['id'])));
+    }
+
+    /**
+     * Check 2FA
+     *
+     * @access public
+     */
+    public function check()
+    {
+        $user = $this->getUser();
+        $this->checkCurrentUser($user);
+
+        $otp = new Otp;
+        $values = $this->request->getValues();
+
+        if (! empty($values['code']) && $otp->checkTotp(Base32::decode($user['twofactor_secret']), $values['code'])) {
+            $this->session['2fa_validated'] = true;
+            $this->session->flash(t('The two factor authentication code is valid.'));
+            $this->response->redirect($this->helper->url('app', 'index'));
+        }
+        else {
+            $this->session->flashError(t('The two factor authentication code is not valid.'));
+            $this->response->redirect($this->helper->url('twofactor', 'code'));
+        }
+    }
+
+    /**
+     * Ask the 2FA code
+     *
+     * @access public
+     */
+    public function code()
+    {
+        $this->response->html($this->template->layout('twofactor/check', array(
+            'title' => t('Check two factor authentication code'),
+        )));
+    }
+}
-- 
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