test: add tests for Token Randomization in Cookie CSRF

tests/system/Security/SecurityCSRFCookieRandomizeTokenTest.php

@@ -0,0 +1,88 @@
+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Security;
+
+use CodeIgniter\Config\Factories;
+use CodeIgniter\Cookie\Cookie;
+use CodeIgniter\HTTP\IncomingRequest;
+use CodeIgniter\HTTP\URI;
+use CodeIgniter\HTTP\UserAgent;
+use CodeIgniter\Test\CIUnitTestCase;
+use CodeIgniter\Test\Mock\MockAppConfig;
+use CodeIgniter\Test\Mock\MockSecurity;
+use Config\Security as SecurityConfig;
+
+/**
+ * @internal
+ */
+final class SecurityCSRFCookieRandomizeTokenTest extends CIUnitTestCase
+{
+    /**
+     * @var string CSRF protection hash
+     */
+    private string $hash = '8b9218a55906f9dcc1dc263dce7f005a';
+
+    /**
+     * @var string CSRF randomized token
+     */
+    private string $randomizedToken = '8bc70b67c91494e815c7d2219c1ae0ab005513c290126d34d41bf41c5265e0f1';
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $_COOKIE = [];
+
+        $config                 = new SecurityConfig();
+        $config->csrfProtection = Security::CSRF_PROTECTION_COOKIE;
+        $config->tokenRandomize = true;
+        Factories::injectMock('config', 'Security', $config);
+
+        // Set Cookie value
+        $security                            = new MockSecurity(new MockAppConfig());
+        $_COOKIE[$security->getCookieName()] = $this->hash;
+
+        $this->resetServices();
+    }
+
+    public function testTokenIsReadFromCookie()
+    {
+        $security = new MockSecurity(new MockAppConfig());
+
+        $this->assertSame(
+            $this->randomizedToken,
+            $security->getHash()
+        );
+    }
+
+    public function testCSRFVerifySetNewCookie()
+    {
+        $_SERVER['REQUEST_METHOD'] = 'POST';
+        $_POST['foo']              = 'bar';
+        $_POST['csrf_test_name']   = $this->randomizedToken;
+
+        $request = new IncomingRequest(new MockAppConfig(), new URI('http://badurl.com'), null, new UserAgent());
+
+        $security = new Security(new MockAppConfig());
+
+        $this->assertInstanceOf(Security::class, $security->verify($request));
+        $this->assertLogged('info', 'CSRF token verified.');
+        $this->assertCount(1, $_POST);
+
+        /** @var Cookie $cookie */
+        $cookie  = $this->getPrivateProperty($security, 'cookie');
+        $newHash = $cookie->getValue();
+
+        $this->assertNotSame($this->hash, $newHash);
+        $this->assertSame(32, strlen($newHash));
+    }
+}