Allow AppFramework applications to specify a custom CSP header

This change allows AppFramework applications to specify a custom CSP header for example when the default policy is too strict. Furthermore this allows us to partially migrate away from CSS and allowed eval() in our JavaScript components.

Legacy ownCloud components will still use the previous policy. Application developers can use this as following in their controllers:
```php
$response = new TemplateResponse('activity', 'list', []);
$cspHelper = new ContentSecurityPolicyHelper();
$cspHelper->addAllowedScriptDomain('www.owncloud.org');
$response->addHeader('Content-Security-Policy', $cspHelper->getPolicy());
return $response;
```

Fixes https://github.com/owncloud/core/issues/11857 which is a pre-requisite for https://github.com/owncloud/core/issues/13458 and https://github.com/owncloud/core/issues/11925

4 files changed, 250 insertions, 6 deletions

diff --git a/tests/lib/appframework/controller/ControllerTest.php b/tests/lib/appframework/controller/ControllerTest.php
index 58395d05914..3bf63d714a0 100644
--- a/tests/lib/appframework/controller/ControllerTest.php
+++ b/tests/lib/appframework/controller/ControllerTest.php
@@ -172,11 +172,12 @@ class ControllerTest extends \Test\TestCase {
 
 
 	public function testFormatDataResponseJSON() {
-		$expectedHeaders = array(
+		$expectedHeaders = [
 			'test' => 'something',
 			'Cache-Control' => 'no-cache, must-revalidate',
-			'Content-Type' => 'application/json; charset=utf-8'
-		);
+			'Content-Type' => 'application/json; charset=utf-8',
+			'Content-Security-Policy' => "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self'",
+		];
 
 		$response = $this->controller->customDataResponse(array('hi'));
 		$response = $this->controller->buildResponse($response, 'json');
diff --git a/tests/lib/appframework/http/ContentSecurityPolicyTest.php b/tests/lib/appframework/http/ContentSecurityPolicyTest.php
new file mode 100644
index 00000000000..3b30bba33d4
--- /dev/null
+++ b/tests/lib/appframework/http/ContentSecurityPolicyTest.php
@@ -0,0 +1,215 @@
+<?php
+/**
+ * Copyright (c) 2015 Lukas Reschke lukas@owncloud.com
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+
+namespace OC\AppFramework\Http;
+
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\ContentSecurityPolicy;
+
+/**
+ * Class ContentSecurityPolicyTest
+ *
+ * @package OC\AppFramework\Http
+ */
+class ContentSecurityPolicyTest extends \Test\TestCase {
+
+	/** @var ContentSecurityPolicy */
+	private $contentSecurityPolicy;
+
+	public function setUp() {
+		parent::setUp();
+		$this->contentSecurityPolicy = new ContentSecurityPolicy();
+	}
+
+	public function testGetPolicyDefault() {
+		$defaultPolicy = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self'";
+		$this->assertSame($defaultPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyScriptDomainValid() {
+		$expectedPolicy = "default-src 'none';script-src 'self' www.owncloud.com 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self'";
+
+		$this->contentSecurityPolicy->addAllowedScriptDomain('www.owncloud.com');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyScriptDomainValidMultiple() {
+		$expectedPolicy = "default-src 'none';script-src 'self' www.owncloud.com www.owncloud.org 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self'";
+
+		$this->contentSecurityPolicy->addAllowedScriptDomain('www.owncloud.com');
+		$this->contentSecurityPolicy->addAllowedScriptDomain('www.owncloud.org');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyScriptAllowInline() {
+		$expectedPolicy = "default-src 'none';script-src 'self' 'unsafe-inline' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self'";
+
+		$this->contentSecurityPolicy->allowInlineScript(true);
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyScriptAllowInlineWithDomain() {
+		$expectedPolicy = "default-src 'none';script-src 'self' www.owncloud.com 'unsafe-inline' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self'";
+
+		$this->contentSecurityPolicy->addAllowedScriptDomain('www.owncloud.com');
+		$this->contentSecurityPolicy->allowInlineScript(true);
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyScriptDisallowInlineAndEval() {
+		$expectedPolicy = "default-src 'none';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self'";
+
+		$this->contentSecurityPolicy->allowInlineScript(false);
+		$this->contentSecurityPolicy->evalScriptState(false);
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyStyleDomainValid() {
+		$expectedPolicy = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' www.owncloud.com 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self'";
+
+		$this->contentSecurityPolicy->addAllowedStyleDomain('www.owncloud.com');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyStyleDomainValidMultiple() {
+		$expectedPolicy = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' www.owncloud.com www.owncloud.org 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self'";
+
+		$this->contentSecurityPolicy->addAllowedStyleDomain('www.owncloud.com');
+		$this->contentSecurityPolicy->addAllowedStyleDomain('www.owncloud.org');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyStyleAllowInline() {
+		$expectedPolicy = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self'";
+
+		$this->contentSecurityPolicy->allowInlineStyle(true);
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyStyleAllowInlineWithDomain() {
+		$expectedPolicy = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' www.owncloud.com 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self'";
+
+		$this->contentSecurityPolicy->addAllowedStyleDomain('www.owncloud.com');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyStyleDisallowInline() {
+		$expectedPolicy = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self';img-src 'self';font-src 'self';connect-src 'self';media-src 'self'";
+
+		$this->contentSecurityPolicy->allowInlineStyle(false);
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyImageDomainValid() {
+		$expectedPolicy = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self' www.owncloud.com;font-src 'self';connect-src 'self';media-src 'self'";
+
+		$this->contentSecurityPolicy->addAllowedImageDomain('www.owncloud.com');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyImageDomainValidMultiple() {
+		$expectedPolicy = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self' www.owncloud.com www.owncloud.org;font-src 'self';connect-src 'self';media-src 'self'";
+
+		$this->contentSecurityPolicy->addAllowedImageDomain('www.owncloud.com');
+		$this->contentSecurityPolicy->addAllowedImageDomain('www.owncloud.org');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyFontDomainValid() {
+		$expectedPolicy = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self' www.owncloud.com;connect-src 'self';media-src 'self'";
+
+		$this->contentSecurityPolicy->addAllowedFontDomain('www.owncloud.com');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyFontDomainValidMultiple() {
+		$expectedPolicy = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self' www.owncloud.com www.owncloud.org;connect-src 'self';media-src 'self'";
+
+		$this->contentSecurityPolicy->addAllowedFontDomain('www.owncloud.com');
+		$this->contentSecurityPolicy->addAllowedFontDomain('www.owncloud.org');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyConnectDomainValid() {
+		$expectedPolicy = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self' www.owncloud.com;media-src 'self'";
+
+		$this->contentSecurityPolicy->addAllowedConnectDomain('www.owncloud.com');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyConnectDomainValidMultiple() {
+		$expectedPolicy = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self' www.owncloud.com www.owncloud.org;media-src 'self'";
+
+		$this->contentSecurityPolicy->addAllowedConnectDomain('www.owncloud.com');
+		$this->contentSecurityPolicy->addAllowedConnectDomain('www.owncloud.org');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyMediaDomainValid() {
+		$expectedPolicy = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self' www.owncloud.com";
+
+		$this->contentSecurityPolicy->addAllowedMediaDomain('www.owncloud.com');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyMediaDomainValidMultiple() {
+		$expectedPolicy = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self' www.owncloud.com www.owncloud.org";
+
+		$this->contentSecurityPolicy->addAllowedMediaDomain('www.owncloud.com');
+		$this->contentSecurityPolicy->addAllowedMediaDomain('www.owncloud.org');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyObjectDomainValid() {
+		$expectedPolicy = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self';object-src www.owncloud.com";
+
+		$this->contentSecurityPolicy->addAllowedObjectDomain('www.owncloud.com');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyObjectDomainValidMultiple() {
+		$expectedPolicy = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self';object-src www.owncloud.com www.owncloud.org";
+
+		$this->contentSecurityPolicy->addAllowedObjectDomain('www.owncloud.com');
+		$this->contentSecurityPolicy->addAllowedObjectDomain('www.owncloud.org');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+
+	public function testGetAllowedFrameDomain() {
+		$expectedPolicy = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self';frame-src www.owncloud.com";
+
+		$this->contentSecurityPolicy->addAllowedFrameDomain('www.owncloud.com');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyFrameDomainValidMultiple() {
+		$expectedPolicy = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self';frame-src www.owncloud.com www.owncloud.org";
+
+		$this->contentSecurityPolicy->addAllowedFrameDomain('www.owncloud.com');
+		$this->contentSecurityPolicy->addAllowedFrameDomain('www.owncloud.org');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testConfigureStacked() {
+		$expectedPolicy = "default-src 'none';script-src 'self' script.owncloud.org;style-src 'self' style.owncloud.org;img-src 'self' img.owncloud.org;font-src 'self' font.owncloud.org;connect-src 'self' connect.owncloud.org;media-src 'self' media.owncloud.org;object-src objects.owncloud.org;frame-src frame.owncloud.org";
+
+		$this->contentSecurityPolicy->allowInlineStyle(false)
+			->evalScriptState(false)
+			->addAllowedScriptDomain('script.owncloud.org')
+			->addAllowedStyleDomain('style.owncloud.org')
+			->addAllowedFontDomain('font.owncloud.org')
+			->addAllowedImageDomain('img.owncloud.org')
+			->addAllowedConnectDomain('connect.owncloud.org')
+			->addAllowedMediaDomain('media.owncloud.org')
+			->addAllowedObjectDomain('objects.owncloud.org')
+			->addAllowedFrameDomain('frame.owncloud.org');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+}
diff --git a/tests/lib/appframework/http/DataResponseTest.php b/tests/lib/appframework/http/DataResponseTest.php
index e91d3cefea9..ca0582e10e5 100644
--- a/tests/lib/appframework/http/DataResponseTest.php
+++ b/tests/lib/appframework/http/DataResponseTest.php
@@ -66,7 +66,10 @@ class DataResponseTest extends \Test\TestCase {
 		$headers = array('test' => 'something');
 		$response = new DataResponse($data, $code, $headers);
 
-		$expectedHeaders = array('Cache-Control' => 'no-cache, must-revalidate');
+		$expectedHeaders = [
+			'Cache-Control' => 'no-cache, must-revalidate',
+			'Content-Security-Policy' => "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self'",
+		];
 		$expectedHeaders = array_merge($expectedHeaders, $headers);
 
 		$this->assertEquals($data, $response->getData());
diff --git a/tests/lib/appframework/http/ResponseTest.php b/tests/lib/appframework/http/ResponseTest.php
index b4352348bae..77e9441b52c 100644
--- a/tests/lib/appframework/http/ResponseTest.php
+++ b/tests/lib/appframework/http/ResponseTest.php
@@ -49,7 +49,7 @@ class ResponseTest extends \Test\TestCase {
 	}
 
 
-	function testSetHeaders(){
+	public function testSetHeaders() {
 		$expected = array(
 			'Last-Modified' => 1,
 			'ETag' => 3,
@@ -58,15 +58,40 @@ class ResponseTest extends \Test\TestCase {
 
 		$this->childResponse->setHeaders($expected);
 		$headers = $this->childResponse->getHeaders();
+		$expected['Content-Security-Policy'] = "default-src 'none';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self'";
 
 		$this->assertEquals($expected, $headers);
 	}
 
+	public function testOverwriteCsp() {
+		$expected = [
+			'Content-Security-Policy' => "default-src 'none';script-src 'self' 'unsafe-inline' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self';font-src 'self';connect-src 'self';media-src 'self'",
+		];
+		$policy = new Http\ContentSecurityPolicy();
+		$policy->allowInlineScript(true);
+
+		$this->childResponse->setContentSecurityPolicy($policy);
+		$headers = $this->childResponse->getHeaders();
+
+		$this->assertEquals(array_merge($expected, $headers), $headers);
+	}
+
+	public function testGetCsp() {
+		$policy = new Http\ContentSecurityPolicy();
+		$policy->allowInlineScript(true);
+
+		$this->childResponse->setContentSecurityPolicy($policy);
+		$this->assertEquals($policy, $this->childResponse->getContentSecurityPolicy());
+	}
+
+	public function testGetCspEmpty() {
+		$this->assertNull($this->childResponse->getContentSecurityPolicy());
+	}
 
 	public function testAddHeaderValueNullDeletesIt(){
 		$this->childResponse->addHeader('hello', 'world');
 		$this->childResponse->addHeader('hello', null);
-		$this->assertEquals(1, count($this->childResponse->getHeaders()));
+		$this->assertEquals(2, count($this->childResponse->getHeaders()));
 	}