Merge pull request #16618 from nextcloud/enh/csp/form-action

Add form-action CSP element

5 files changed, 108 insertions, 60 deletions

diff --git a/lib/private/Security/CSP/ContentSecurityPolicy.php b/lib/private/Security/CSP/ContentSecurityPolicy.php
index a066c986f15..9d1d043a165 100644
--- a/lib/private/Security/CSP/ContentSecurityPolicy.php
+++ b/lib/private/Security/CSP/ContentSecurityPolicy.php
@@ -225,6 +225,15 @@ class ContentSecurityPolicy extends \OCP\AppFramework\Http\ContentSecurityPolicy
 		$this->allowedWorkerSrcDomains = $allowedWorkerSrcDomains;
 	}
 
+	public function getAllowedFormActionDomains(): array {
+		return $this->allowedFormActionDomains;
+	}
+
+	public function setAllowedFormActionDomains(array $allowedFormActionDomains): void {
+		$this->allowedFormActionDomains = $allowedFormActionDomains;
+	}
+
+
 	public function getReportTo(): array {
 		return $this->reportTo;
 	}
diff --git a/lib/public/AppFramework/Http/ContentSecurityPolicy.php b/lib/public/AppFramework/Http/ContentSecurityPolicy.php
index c12fbc7561e..0bb776a08e6 100644
--- a/lib/public/AppFramework/Http/ContentSecurityPolicy.php
+++ b/lib/public/AppFramework/Http/ContentSecurityPolicy.php
@@ -93,6 +93,11 @@ class ContentSecurityPolicy extends EmptyContentSecurityPolicy {
 	/** @var array Domains from which web-workers can be loaded */
 	protected $allowedWorkerSrcDomains = [];
 
+	/** @var array Domains which can be used as target for forms */
+	protected $allowedFormActionDomains = [
+		'\'self\'',
+	];
+
 	/** @var array Locations to report violations to */
 	protected $reportTo = [];
 }
diff --git a/lib/public/AppFramework/Http/EmptyContentSecurityPolicy.php b/lib/public/AppFramework/Http/EmptyContentSecurityPolicy.php
index 0a77e27d8c0..de892aacf26 100644
--- a/lib/public/AppFramework/Http/EmptyContentSecurityPolicy.php
+++ b/lib/public/AppFramework/Http/EmptyContentSecurityPolicy.php
@@ -75,6 +75,8 @@ class EmptyContentSecurityPolicy {
 	protected $allowedFrameAncestors = null;
 	/** @var array Domains from which web-workers can be loaded */
 	protected $allowedWorkerSrcDomains = null;
+	/** @var array Domains which can be used as target for forms */
+	protected $allowedFormActionDomains = null;
 
 	/** @var array Locations to report violations to */
 	protected $reportTo = null;
@@ -387,6 +389,29 @@ class EmptyContentSecurityPolicy {
 	}
 
 	/**
+	 * Domain to where forms can submit
+	 *
+	 * @since 17.0.0
+	 *
+	 * @return $this
+	 */
+	public function addAllowedFormActionDomain(string $domain) {
+		$this->allowedFormActionDomains[] = $domain;
+		return $this;
+	}
+
+	/**
+	 * Remove domain to where forms can submit
+	 *
+	 * @return $this
+	 * @since 17.0.0
+	 */
+	public function disallowFormActionDomain(string $domain) {
+		$this->allowedFormActionDomains = array_diff($this->allowedFormActionDomains, [$domain]);
+		return $this;
+	}
+
+	/**
 	 * Add location to report CSP violations to
 	 *
 	 * @param string $location
@@ -491,6 +516,11 @@ class EmptyContentSecurityPolicy {
 			$policy .= ';';
 		}
 
+		if (!empty($this->allowedFormActionDomains)) {
+			$policy .= 'form-action ' . implode(' ', $this->allowedFormActionDomains);
+			$policy .= ';';
+		}
+
 		if (!empty($this->reportTo)) {
 			$policy .= 'report-uri ' . implode(' ', $this->reportTo);
 			$policy .= ';';
diff --git a/tests/lib/AppFramework/Http/ContentSecurityPolicyTest.php b/tests/lib/AppFramework/Http/ContentSecurityPolicyTest.php
index 20b1d433c60..fab488ef990 100644
--- a/tests/lib/AppFramework/Http/ContentSecurityPolicyTest.php
+++ b/tests/lib/AppFramework/Http/ContentSecurityPolicyTest.php
@@ -28,19 +28,19 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDefault() {
-		$defaultPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$defaultPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 		$this->assertSame($defaultPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 
 	public function testGetPolicyScriptDomainValid() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' www.owncloud.com;style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' www.owncloud.com;style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedScriptDomain('www.owncloud.com');
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 
 	public function testGetPolicyScriptDomainValidMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' www.owncloud.com www.owncloud.org;style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' www.owncloud.com www.owncloud.org;style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedScriptDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->addAllowedScriptDomain('www.owncloud.org');
@@ -48,7 +48,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowScriptDomain() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedScriptDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowScriptDomain('www.owncloud.com');
@@ -56,7 +56,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowScriptDomainMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' www.owncloud.com;style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' www.owncloud.com;style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedScriptDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowScriptDomain('www.owncloud.org');
@@ -64,7 +64,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowScriptDomainMultipleStacked() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedScriptDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowScriptDomain('www.owncloud.org')->disallowScriptDomain('www.owncloud.com');
@@ -72,14 +72,14 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyScriptAllowInline() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' 'unsafe-inline';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' 'unsafe-inline';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->allowInlineScript(true);
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 
 	public function testGetPolicyScriptAllowInlineWithDomain() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' www.owncloud.com 'unsafe-inline';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' www.owncloud.com 'unsafe-inline';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedScriptDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->allowInlineScript(true);
@@ -87,7 +87,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyScriptDisallowInlineAndEval() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->allowInlineScript(false);
 		$this->contentSecurityPolicy->allowEvalScript(false);
@@ -95,14 +95,14 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyStyleDomainValid() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' www.owncloud.com 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' www.owncloud.com 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedStyleDomain('www.owncloud.com');
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 
 	public function testGetPolicyStyleDomainValidMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' www.owncloud.com www.owncloud.org 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' www.owncloud.com www.owncloud.org 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedStyleDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->addAllowedStyleDomain('www.owncloud.org');
@@ -110,7 +110,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowStyleDomain() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedStyleDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowStyleDomain('www.owncloud.com');
@@ -118,7 +118,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowStyleDomainMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' www.owncloud.com 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' www.owncloud.com 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedStyleDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowStyleDomain('www.owncloud.org');
@@ -126,7 +126,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowStyleDomainMultipleStacked() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedStyleDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowStyleDomain('www.owncloud.org')->disallowStyleDomain('www.owncloud.com');
@@ -134,35 +134,35 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyStyleAllowInline() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->allowInlineStyle(true);
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 
 	public function testGetPolicyStyleAllowInlineWithDomain() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' www.owncloud.com 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' www.owncloud.com 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedStyleDomain('www.owncloud.com');
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 
 	public function testGetPolicyStyleDisallowInline() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->allowInlineStyle(false);
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 
 	public function testGetPolicyImageDomainValid() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob: www.owncloud.com;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob: www.owncloud.com;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedImageDomain('www.owncloud.com');
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 
 	public function testGetPolicyImageDomainValidMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob: www.owncloud.com www.owncloud.org;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob: www.owncloud.com www.owncloud.org;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedImageDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->addAllowedImageDomain('www.owncloud.org');
@@ -170,7 +170,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowImageDomain() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedImageDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowImageDomain('www.owncloud.com');
@@ -178,7 +178,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowImageDomainMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob: www.owncloud.com;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob: www.owncloud.com;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedImageDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowImageDomain('www.owncloud.org');
@@ -186,7 +186,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowImageDomainMultipleStakes() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedImageDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowImageDomain('www.owncloud.org')->disallowImageDomain('www.owncloud.com');
@@ -194,14 +194,14 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyFontDomainValid() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data: www.owncloud.com;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data: www.owncloud.com;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedFontDomain('www.owncloud.com');
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 
 	public function testGetPolicyFontDomainValidMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data: www.owncloud.com www.owncloud.org;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data: www.owncloud.com www.owncloud.org;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedFontDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->addAllowedFontDomain('www.owncloud.org');
@@ -209,7 +209,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowFontDomain() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedFontDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowFontDomain('www.owncloud.com');
@@ -217,7 +217,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowFontDomainMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data: www.owncloud.com;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data: www.owncloud.com;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedFontDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowFontDomain('www.owncloud.org');
@@ -225,7 +225,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowFontDomainMultipleStakes() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedFontDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowFontDomain('www.owncloud.org')->disallowFontDomain('www.owncloud.com');
@@ -233,14 +233,14 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyConnectDomainValid() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self' www.owncloud.com;media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self' www.owncloud.com;media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedConnectDomain('www.owncloud.com');
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 
 	public function testGetPolicyConnectDomainValidMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self' www.owncloud.com www.owncloud.org;media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self' www.owncloud.com www.owncloud.org;media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedConnectDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->addAllowedConnectDomain('www.owncloud.org');
@@ -248,7 +248,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowConnectDomain() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedConnectDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowConnectDomain('www.owncloud.com');
@@ -256,7 +256,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowConnectDomainMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self' www.owncloud.com;media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self' www.owncloud.com;media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedConnectDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowConnectDomain('www.owncloud.org');
@@ -264,7 +264,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowConnectDomainMultipleStakes() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedConnectDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowConnectDomain('www.owncloud.org')->disallowConnectDomain('www.owncloud.com');
@@ -272,14 +272,14 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyMediaDomainValid() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self' www.owncloud.com;frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self' www.owncloud.com;frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedMediaDomain('www.owncloud.com');
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 
 	public function testGetPolicyMediaDomainValidMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self' www.owncloud.com www.owncloud.org;frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self' www.owncloud.com www.owncloud.org;frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedMediaDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->addAllowedMediaDomain('www.owncloud.org');
@@ -287,7 +287,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowMediaDomain() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedMediaDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowMediaDomain('www.owncloud.com');
@@ -295,7 +295,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowMediaDomainMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self' www.owncloud.com;frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self' www.owncloud.com;frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedMediaDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowMediaDomain('www.owncloud.org');
@@ -303,7 +303,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowMediaDomainMultipleStakes() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedMediaDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowMediaDomain('www.owncloud.org')->disallowMediaDomain('www.owncloud.com');
@@ -311,14 +311,14 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyObjectDomainValid() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';object-src www.owncloud.com;frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';object-src www.owncloud.com;frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedObjectDomain('www.owncloud.com');
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 
 	public function testGetPolicyObjectDomainValidMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';object-src www.owncloud.com www.owncloud.org;frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';object-src www.owncloud.com www.owncloud.org;frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedObjectDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->addAllowedObjectDomain('www.owncloud.org');
@@ -326,7 +326,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowObjectDomain() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedObjectDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowObjectDomain('www.owncloud.com');
@@ -334,7 +334,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowObjectDomainMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';object-src www.owncloud.com;frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';object-src www.owncloud.com;frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedObjectDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowObjectDomain('www.owncloud.org');
@@ -342,7 +342,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowObjectDomainMultipleStakes() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedObjectDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowObjectDomain('www.owncloud.org')->disallowObjectDomain('www.owncloud.com');
@@ -350,14 +350,14 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetAllowedFrameDomain() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-src www.owncloud.com;frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-src www.owncloud.com;frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedFrameDomain('www.owncloud.com');
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 
 	public function testGetPolicyFrameDomainValidMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-src www.owncloud.com www.owncloud.org;frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-src www.owncloud.com www.owncloud.org;frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedFrameDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->addAllowedFrameDomain('www.owncloud.org');
@@ -365,7 +365,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowFrameDomain() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedFrameDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowFrameDomain('www.owncloud.com');
@@ -373,7 +373,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowFrameDomainMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-src www.owncloud.com;frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-src www.owncloud.com;frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedFrameDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowFrameDomain('www.owncloud.org');
@@ -381,7 +381,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowFrameDomainMultipleStakes() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedFrameDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowFrameDomain('www.owncloud.org')->disallowFrameDomain('www.owncloud.com');
@@ -389,14 +389,14 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetAllowedChildSrcDomain() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';child-src child.owncloud.com;frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';child-src child.owncloud.com;frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedChildSrcDomain('child.owncloud.com');
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 
 	public function testGetPolicyChildSrcValidMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';child-src child.owncloud.com child.owncloud.org;frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';child-src child.owncloud.com child.owncloud.org;frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedChildSrcDomain('child.owncloud.com');
 		$this->contentSecurityPolicy->addAllowedChildSrcDomain('child.owncloud.org');
@@ -404,7 +404,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowChildSrcDomain() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedChildSrcDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowChildSrcDomain('www.owncloud.com');
@@ -412,7 +412,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowChildSrcDomainMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';child-src www.owncloud.com;frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';child-src www.owncloud.com;frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedChildSrcDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowChildSrcDomain('www.owncloud.org');
@@ -420,7 +420,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowChildSrcDomainMultipleStakes() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedChildSrcDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowChildSrcDomain('www.owncloud.org')->disallowChildSrcDomain('www.owncloud.com');
@@ -430,14 +430,14 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 
 
 	public function testGetAllowedFrameAncestorDomain() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self' sub.nextcloud.com";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self' sub.nextcloud.com;form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedFrameAncestorDomain('sub.nextcloud.com');
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 
 	public function testGetPolicyFrameAncestorValidMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self' sub.nextcloud.com foo.nextcloud.com";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self' sub.nextcloud.com foo.nextcloud.com;form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedFrameAncestorDomain('sub.nextcloud.com');
 		$this->contentSecurityPolicy->addAllowedFrameAncestorDomain('foo.nextcloud.com');
@@ -445,7 +445,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowFrameAncestorDomain() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedFrameAncestorDomain('www.nextcloud.com');
 		$this->contentSecurityPolicy->disallowFrameAncestorDomain('www.nextcloud.com');
@@ -453,7 +453,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowFrameAncestorDomainMultiple() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self' www.nextcloud.com";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self' www.nextcloud.com;form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedFrameAncestorDomain('www.nextcloud.com');
 		$this->contentSecurityPolicy->disallowFrameAncestorDomain('www.nextcloud.org');
@@ -461,7 +461,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyDisallowFrameAncestorDomainMultipleStakes() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->addAllowedChildSrcDomain('www.owncloud.com');
 		$this->contentSecurityPolicy->disallowChildSrcDomain('www.owncloud.org')->disallowChildSrcDomain('www.owncloud.com');
@@ -469,7 +469,7 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyUnsafeEval() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-ancestors 'self';form-action 'self'";
 
 		$this->contentSecurityPolicy->allowEvalScript(true);
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
diff --git a/tests/lib/Security/CSP/ContentSecurityPolicyManagerTest.php b/tests/lib/Security/CSP/ContentSecurityPolicyManagerTest.php
index 279c4672d80..7ee7350c661 100644
--- a/tests/lib/Security/CSP/ContentSecurityPolicyManagerTest.php
+++ b/tests/lib/Security/CSP/ContentSecurityPolicyManagerTest.php
@@ -62,6 +62,7 @@ class ContentSecurityPolicyManagerTest extends TestCase {
 		$policy = new \OCP\AppFramework\Http\EmptyContentSecurityPolicy();
 		$policy->addAllowedChildSrcDomain('childdomain');
 		$policy->addAllowedFontDomain('anotherFontDomain');
+		$policy->addAllowedFormActionDomain('thirdDomain');
 		$this->contentSecurityPolicyManager->addDefaultPolicy($policy);
 
 		$expected = new \OC\Security\CSP\ContentSecurityPolicy();
@@ -70,10 +71,11 @@ class ContentSecurityPolicyManagerTest extends TestCase {
 		$expected->addAllowedFontDomain('mydomain.com');
 		$expected->addAllowedFontDomain('example.com');
 		$expected->addAllowedFontDomain('anotherFontDomain');
+		$expected->addAllowedFormActionDomain('thirdDomain');
 		$expected->addAllowedImageDomain('anotherdomain.de');
 		$expected->addAllowedImageDomain('example.org');
 		$expected->addAllowedChildSrcDomain('childdomain');
-		$expectedStringPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' 'unsafe-inline' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self' data: blob: anotherdomain.de example.org;font-src 'self' data: mydomain.com example.com anotherFontDomain;connect-src 'self';media-src 'self';child-src childdomain;frame-ancestors 'self'";
+		$expectedStringPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' 'unsafe-inline' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self' data: blob: anotherdomain.de example.org;font-src 'self' data: mydomain.com example.com anotherFontDomain;connect-src 'self';media-src 'self';child-src childdomain;frame-ancestors 'self';form-action 'self' thirdDomain";
 
 		$this->assertEquals($expected, $this->contentSecurityPolicyManager->getDefaultPolicy());
 		$this->assertSame($expectedStringPolicy, $this->contentSecurityPolicyManager->getDefaultPolicy()->buildPolicy());
@@ -101,6 +103,7 @@ class ContentSecurityPolicyManagerTest extends TestCase {
 			$policy = new \OCP\AppFramework\Http\EmptyContentSecurityPolicy();
 			$policy->addAllowedChildSrcDomain('childdomain');
 			$policy->addAllowedFontDomain('anotherFontDomain');
+			$policy->addAllowedFormActionDomain('thirdDomain');
 			$e->addPolicy($policy);
 		});
 
@@ -113,7 +116,8 @@ class ContentSecurityPolicyManagerTest extends TestCase {
 		$expected->addAllowedImageDomain('anotherdomain.de');
 		$expected->addAllowedImageDomain('example.org');
 		$expected->addAllowedChildSrcDomain('childdomain');
-		$expectedStringPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' 'unsafe-inline' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self' data: blob: anotherdomain.de example.org;font-src 'self' data: mydomain.com example.com anotherFontDomain;connect-src 'self';media-src 'self';child-src childdomain;frame-ancestors 'self'";
+		$expected->addAllowedFormActionDomain('thirdDomain');
+		$expectedStringPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' 'unsafe-inline' 'unsafe-eval';style-src 'self' 'unsafe-inline';img-src 'self' data: blob: anotherdomain.de example.org;font-src 'self' data: mydomain.com example.com anotherFontDomain;connect-src 'self';media-src 'self';child-src childdomain;frame-ancestors 'self';form-action 'self' thirdDomain";
 
 		$this->assertEquals($expected, $this->contentSecurityPolicyManager->getDefaultPolicy());
 		$this->assertSame($expectedStringPolicy, $this->contentSecurityPolicyManager->getDefaultPolicy()->buildPolicy());