Fix mismatched URL comparisions in SecurityComponent.

When SecurityComponent was updated to use new request methods, I forgot
to take into account base URL paths. In order to get those applied, we
can use Router::url(). This ensures we get the same urls that FormHelper
creates. I've also fixed an issue where if the session hadn't already
been started secured forms would fail as session_id() would return ''
instead of the actual session id.

Refs #11932

src/Controller/Component/SecurityComponent.php

@@ -22,6 +22,7 @@
 use Cake\Event\Event;
 use Cake\Http\Exception\BadRequestException;
 use Cake\Http\ServerRequest;
+use Cake\Routing\Router;
 use Cake\Utility\Hash;
 use Cake\Utility\Security;
 
@@ -378,14 +379,21 @@ protected function _validToken(Controller $controller)
      */
     protected function _hashParts(Controller $controller)
     {
-        $fieldList = $this->_fieldsList($controller->request->getData());
-        $unlocked = $this->_sortedUnlocked($controller->request->getData());
+        $request = $controller->getRequest();
+
+        // Start the session to ensure we get the correct session id.
+        $session = $request->getSession();
+        $session->start();
+
+        $data = $request->getData();
+        $fieldList = $this->_fieldsList($data);
+        $unlocked = $this->_sortedUnlocked($data);
 
         return [
-            $controller->request->getRequestTarget(),
+            Router::url($request->getRequestTarget()),
             serialize($fieldList),
             $unlocked,
-            session_id(),
+            $session->id()
         ];
     }
 

tests/TestCase/Controller/Component/SecurityComponentTest.php

@@ -21,6 +21,7 @@
 use Cake\Event\Event;
 use Cake\Http\ServerRequest;
 use Cake\Http\Session;
+use Cake\Routing\Router;
 use Cake\TestSuite\TestCase;
 use Cake\Utility\Security;
 
@@ -189,7 +190,7 @@ public function tearDown()
         unset($this->Controller);
     }
 
-    public function validatePost($expectedException = null, $expectedExceptionMessage = null)
+    public function validatePost($expectedException = 'SecurityException', $expectedExceptionMessage = null)
     {
         try {
             return $this->Controller->Security->validatePost($this->Controller);
@@ -744,6 +745,37 @@ public function testValidatePostSimple()
         $this->assertTrue($result);
     }
 
+    /**
+     * test validatePost uses full URL
+     *
+     * @return void
+     * @triggers Controller.startup $this->Controller
+     */
+    public function testValidatePostSubdirectory()
+    {
+        // set the base path.
+        $this->Controller->request = $this->Controller->request
+            ->withAttribute('base', 'subdir')
+            ->withAttributE('webroot', 'subdir/');
+        Router::pushRequest($this->Controller->request);
+
+        $event = new Event('Controller.startup', $this->Controller);
+        $this->Security->startup($event);
+
+        // Differs from testValidatePostSimple because of base url
+        $fields = 'cc9b6af3f33147235ae8f8037b0a71399a2425f2%3A';
+        $unlocked = '';
+        $debug = '';
+
+        $this->Controller->request = $this->Controller->request->withParsedBody([
+            'Model' => ['username' => '', 'password' => ''],
+            '_Token' => compact('fields', 'unlocked', 'debug')
+        ]);
+
+        $result = $this->validatePost();
+        $this->assertTrue($result);
+    }
+
     /**
      * testValidatePostComplex method
      *