From 110966bd6a382da47c1cb554cd4b38b9bdcab672 Mon Sep 17 00:00:00 2001
From: Taylor Otwell <taylorotwell@gmail.com>
Date: Tue, 25 Sep 2012 08:40:29 -0500
Subject: [PATCH] working on cookie fingerprinting.

---
 laravel/cookie.php                   | 42 ++++++++++++++++++++++++++--
 laravel/tests/cases/auth.test.php    |  2 +-
 laravel/tests/cases/cookie.test.php  |  6 ++--
 laravel/tests/cases/session.test.php |  2 +-
 4 files changed, 45 insertions(+), 7 deletions(-)

diff --git a/laravel/cookie.php b/laravel/cookie.php
index 1c3b5873..21c67bb7 100644
--- a/laravel/cookie.php
+++ b/laravel/cookie.php
@@ -44,9 +44,14 @@ public static function has($name)
 	 */
 	public static function get($name, $default = null)
 	{
-		if (isset(static::$jar[$name])) return static::$jar[$name]['value'];
+		if (isset(static::$jar[$name])) return static::parse(static::$jar[$name]['value']);
 
-		return array_get(Request::foundation()->cookies->all(), $name, $default);
+		if ( ! is_null($value = Request::foundation()->cookies->get($name)))
+		{
+			return static::parse($value);
+		}
+
+		return value($default);
 	}
 
 	/**
@@ -75,6 +80,8 @@ public static function put($name, $value, $expiration = 0, $path = '/', $domain
 			$expiration = time() + ($expiration * 60);
 		}
 
+		$value = sha1($value.Config::get('application.key')).'+'.$value;
+
 		// If the secure option is set to true, yet the request is not over HTTPS
 		// we'll throw an exception to let the developer know that they are
 		// attempting to send a secure cookie over the insecure HTTP.
@@ -120,4 +127,35 @@ public static function forget($name, $path = '/', $domain = null, $secure = fals
 		return static::put($name, null, -2000, $path, $domain, $secure);
 	}
 
+	/**
+	 * Parse a hash fingerprinted cookie value.
+	 *
+	 * @param  string  $value
+	 * @return string
+	 */
+	protected static function parse($value)
+	{
+		$segments = explode('+', $value);
+
+		// First we will make sure the cookie actually has enough segments to even
+		// be valid as being set by the application. If it does not we will go
+		// ahead and throw exceptions now since there the cookie is invalid.
+		if ( ! (count($segments) >= 2))
+		{
+			throw new \Exception("Cookie was not set by application.");
+		}
+
+		$value = implode('+', array_slice($segments, 1));
+
+		// Now we will check if the SHA-1 hash present in the first segment matches
+		// the ShA-1 hash of the rest of the cookie value, since the hash should
+		// have been set when the cookie was first created by the application.
+		if ($segments[0] == sha1($value.Config::get('application.key')))
+		{
+			return $value;
+		}
+
+		throw new \Exception("Cookie has been modified by client.");
+	}
+
 }
diff --git a/laravel/tests/cases/auth.test.php b/laravel/tests/cases/auth.test.php
index 16ba428a..44ff671e 100644
--- a/laravel/tests/cases/auth.test.php
+++ b/laravel/tests/cases/auth.test.php
@@ -269,7 +269,7 @@ public function testLoginStoresRememberCookieWhenNeeded()
 
 		$this->assertTrue(isset(Cookie::$jar['laravel_auth_drivers_fluent_remember']));
 
-		$cookie = Cookie::$jar['laravel_auth_drivers_fluent_remember']['value'];
+		$cookie = Cookie::get('laravel_auth_drivers_fluent_remember');
 		$cookie = explode('|', Crypter::decrypt($cookie));
 		$this->assertEquals(1, $cookie[0]);
 		$this->assertEquals('foo', Cookie::$jar['laravel_auth_drivers_fluent_remember']['path']);
diff --git a/laravel/tests/cases/cookie.test.php b/laravel/tests/cases/cookie.test.php
index f62f7857..e17070b0 100644
--- a/laravel/tests/cases/cookie.test.php
+++ b/laravel/tests/cases/cookie.test.php
@@ -67,7 +67,7 @@ protected function restartRequest()
 	 */
 	public function testHasMethodIndicatesIfCookieInSet()
 	{
-		Cookie::$jar['foo'] = array('value' => 'bar');
+		Cookie::$jar['foo'] = array('value' => sha1('bar'.Config::get('application.key')).'+bar');
 		$this->assertTrue(Cookie::has('foo'));
 		$this->assertFalse(Cookie::has('bar'));
 
@@ -82,7 +82,7 @@ public function testHasMethodIndicatesIfCookieInSet()
 	 */
 	public function testGetMethodCanReturnValueOfCookies()
 	{
-		Cookie::$jar['foo'] = array('value' => 'bar');
+		Cookie::$jar['foo'] = array('value' => sha1('bar'.Config::get('application.key')).'+bar');
 		$this->assertEquals('bar', Cookie::get('foo'));
 
 		Cookie::put('bar', 'baz');
@@ -97,7 +97,7 @@ public function testGetMethodCanReturnValueOfCookies()
 	public function testForeverShouldUseATonOfMinutes()
 	{
 		Cookie::forever('foo', 'bar');
-		$this->assertEquals('bar', Cookie::$jar['foo']['value']);
+		$this->assertEquals(sha1('bar'.Config::get('application.key')).'+bar', Cookie::$jar['foo']['value']);
 
 		// Shouldn't be able to test this cause while we indicate -2000 seconds 
 		// cookie expiration store timestamp.
diff --git a/laravel/tests/cases/session.test.php b/laravel/tests/cases/session.test.php
index cf6946a7..b46b5ba0 100644
--- a/laravel/tests/cases/session.test.php
+++ b/laravel/tests/cases/session.test.php
@@ -372,7 +372,7 @@ public function testSaveMethodSetsCookieWithCorrectValues()
 
 		$cookie = Cookie::$jar[Config::get('session.cookie')];
 
-		$this->assertEquals('foo', $cookie['value']);
+		$this->assertEquals(sha1('foo'.Config::get('application.key')).'+foo', $cookie['value']);
 		// Shouldn't be able to test this cause session.lifetime store number of minutes 
 		// while cookie expiration store timestamp when it going to expired.
 		// $this->assertEquals(Config::get('session.lifetime'), $cookie['expiration']);