[HttpFoundation] Reject URIs that contain invalid characters

Author: nicolas-grekas

Request.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\HttpFoundation;
 
+use Symfony\Component\HttpFoundation\Exception\BadRequestException;
 use Symfony\Component\HttpFoundation\Exception\ConflictingHeadersException;
 use Symfony\Component\HttpFoundation\Exception\JsonException;
 use Symfony\Component\HttpFoundation\Exception\SessionNotFoundException;
@@ -333,6 +334,8 @@ public static function createFromGlobals()
      * @param string|resource|null $content    The raw body data
      *
      * @return static
+     *
+     * @throws BadRequestException When the URI is invalid
      */
     public static function create(string $uri, string $method = 'GET', array $parameters = [], array $cookies = [], array $files = [], array $server = [], $content = null)
     {
@@ -360,6 +363,20 @@ public static function create(string $uri, string $method = 'GET', array $parame
             unset($components['fragment']);
         }
 
+        if (false === $components) {
+            throw new BadRequestException('Invalid URI.');
+        }
+
+        if (false !== ($i = strpos($uri, '\\')) && $i < strcspn($uri, '?#')) {
+            throw new BadRequestException('Invalid URI: A URI cannot contain a backslash.');
+        }
+        if (\strlen($uri) !== strcspn($uri, "\r\n\t")) {
+            throw new BadRequestException('Invalid URI: A URI cannot contain CR/LF/TAB characters.');
+        }
+        if ('' !== $uri && (\ord($uri[0]) <= 32 || \ord($uri[-1]) <= 32)) {
+            throw new BadRequestException('Invalid URI: A URI must not start nor end with ASCII control characters or spaces.');
+        }
+
         if (isset($components['host'])) {
             $server['SERVER_NAME'] = $components['host'];
             $server['HTTP_HOST'] = $components['host'];

Tests/RequestTest.php

@@ -13,6 +13,7 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\PhpUnit\ExpectDeprecationTrait;
+use Symfony\Component\HttpFoundation\Exception\BadRequestException;
 use Symfony\Component\HttpFoundation\Exception\ConflictingHeadersException;
 use Symfony\Component\HttpFoundation\Exception\JsonException;
 use Symfony\Component\HttpFoundation\Exception\SuspiciousOperationException;
@@ -289,9 +290,34 @@ public function testCreateWithRequestUri()
         $this->assertTrue($request->isSecure());
 
         // Fragment should not be included in the URI
-        $request = Request::create('http://test.com/foo#bar');
-        $request->server->set('REQUEST_URI', 'http://test.com/foo#bar');
+        $request = Request::create('http://test.com/foo#bar\\baz');
+        $request->server->set('REQUEST_URI', 'http://test.com/foo#bar\\baz');
         $this->assertEquals('http://test.com/foo', $request->getUri());
+
+        $request = Request::create('http://test.com/foo?bar=f\\o');
+        $this->assertEquals('http://test.com/foo?bar=f%5Co', $request->getUri());
+        $this->assertEquals('/foo', $request->getPathInfo());
+        $this->assertEquals('bar=f%5Co', $request->getQueryString());
+    }
+
+    /**
+     * @testWith ["http://foo.com\\bar"]
+     *           ["\\\\foo.com/bar"]
+     *           ["a\rb"]
+     *           ["a\nb"]
+     *           ["a\tb"]
+     *           ["\u0000foo"]
+     *           ["foo\u0000"]
+     *           [" foo"]
+     *           ["foo "]
+     *           [":"]
+     */
+    public function testCreateWithBadRequestUri(string $uri)
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('Invalid URI');
+
+        Request::create($uri);
     }
 
     /**