Merge pull request #41571 from nextcloud/fix/allow-strict-dynamic-elem

Allow setting `strict-dynamic` on `strict-src-elem` and set it by default

6 files changed, 167 insertions, 65 deletions

diff --git a/lib/private/Security/CSP/ContentSecurityPolicy.php b/lib/private/Security/CSP/ContentSecurityPolicy.php
index eca3e2b6b29..ee525af4c2a 100644
--- a/lib/private/Security/CSP/ContentSecurityPolicy.php
+++ b/lib/private/Security/CSP/ContentSecurityPolicy.php
@@ -191,4 +191,12 @@ class ContentSecurityPolicy extends \OCP\AppFramework\Http\ContentSecurityPolicy
 	public function setStrictDynamicAllowed(bool $strictDynamicAllowed): void {
 		$this->strictDynamicAllowed = $strictDynamicAllowed;
 	}
+
+	public function isStrictDynamicAllowedOnScripts(): bool {
+		return $this->strictDynamicAllowedOnScripts;
+	}
+
+	public function setStrictDynamicAllowedOnScripts(bool $strictDynamicAllowedOnScripts): void {
+		$this->strictDynamicAllowedOnScripts = $strictDynamicAllowedOnScripts;
+	}
 }
diff --git a/lib/public/AppFramework/Http/ContentSecurityPolicy.php b/lib/public/AppFramework/Http/ContentSecurityPolicy.php
index f17dd9bd270..7f93f7004d9 100644
--- a/lib/public/AppFramework/Http/ContentSecurityPolicy.php
+++ b/lib/public/AppFramework/Http/ContentSecurityPolicy.php
@@ -48,6 +48,8 @@ class ContentSecurityPolicy extends EmptyContentSecurityPolicy {
 	protected ?bool $evalWasmAllowed = false;
 	/** @var bool Whether strict-dynamic should be set */
 	protected $strictDynamicAllowed = false;
+	/** @var bool Whether strict-dynamic should be set for 'script-src-elem' */
+	protected $strictDynamicAllowedOnScripts = true;
 	/** @var array Domains from which scripts can get loaded */
 	protected $allowedScriptDomains = [
 		'\'self\'',
diff --git a/lib/public/AppFramework/Http/EmptyContentSecurityPolicy.php b/lib/public/AppFramework/Http/EmptyContentSecurityPolicy.php
index 7e1de2ef2eb..960efa75d2c 100644
--- a/lib/public/AppFramework/Http/EmptyContentSecurityPolicy.php
+++ b/lib/public/AppFramework/Http/EmptyContentSecurityPolicy.php
@@ -41,6 +41,8 @@ class EmptyContentSecurityPolicy {
 	protected $useJsNonce = null;
 	/** @var bool Whether strict-dynamic should be used */
 	protected $strictDynamicAllowed = null;
+	/** @var bool Whether strict-dynamic should be used on script-src-elem */
+	protected $strictDynamicAllowedOnScripts = null;
 	/**
 	 * @var bool Whether eval in JS scripts is allowed
 	 * TODO: Disallow per default
@@ -94,6 +96,18 @@ class EmptyContentSecurityPolicy {
 	}
 
 	/**
+	 * In contrast to `useStrictDynamic` this only sets strict-dynamic on script-src-elem
+	 * Meaning only grants trust to all imports of scripts that were loaded in `<script>` tags, and thus weakens less the CSP.
+	 * @param bool $state
+	 * @return EmptyContentSecurityPolicy
+	 * @since 28.0.0
+	 */
+	public function useStrictDynamicOnScripts(bool $state = false): self {
+		$this->strictDynamicAllowedOnScripts = $state;
+		return $this;
+	}
+
+	/**
 	 * Use the according JS nonce
 	 * This method is only for CSPMiddleware, custom values are ignored in mergePolicies of ContentSecurityPolicyManager
 	 *
@@ -448,27 +462,35 @@ class EmptyContentSecurityPolicy {
 
 		if (!empty($this->allowedScriptDomains) || $this->evalScriptAllowed || $this->evalWasmAllowed) {
 			$policy .= 'script-src ';
+			$scriptSrc = '';
 			if (is_string($this->useJsNonce)) {
 				if ($this->strictDynamicAllowed) {
-					$policy .= '\'strict-dynamic\' ';
+					$scriptSrc .= '\'strict-dynamic\' ';
 				}
-				$policy .= '\'nonce-'.base64_encode($this->useJsNonce).'\'';
+				$scriptSrc .= '\'nonce-'.base64_encode($this->useJsNonce).'\'';
 				$allowedScriptDomains = array_flip($this->allowedScriptDomains);
 				unset($allowedScriptDomains['\'self\'']);
 				$this->allowedScriptDomains = array_flip($allowedScriptDomains);
 				if (count($allowedScriptDomains) !== 0) {
-					$policy .= ' ';
+					$scriptSrc .= ' ';
 				}
 			}
 			if (is_array($this->allowedScriptDomains)) {
-				$policy .= implode(' ', $this->allowedScriptDomains);
+				$scriptSrc .= implode(' ', $this->allowedScriptDomains);
 			}
 			if ($this->evalScriptAllowed) {
-				$policy .= ' \'unsafe-eval\'';
+				$scriptSrc .= ' \'unsafe-eval\'';
 			}
 			if ($this->evalWasmAllowed) {
-				$policy .= ' \'wasm-unsafe-eval\'';
+				$scriptSrc .= ' \'wasm-unsafe-eval\'';
 			}
+			$policy .= $scriptSrc . ';';
+		}
+
+		// We only need to set this if 'strictDynamicAllowed' is not set because otherwise we can simply fall back to script-src
+		if ($this->strictDynamicAllowedOnScripts && !(is_string($this->useJsNonce) && $this->strictDynamicAllowed)) {
+			$policy .= 'script-src-elem \'strict-dynamic\' ';
+			$policy .= $scriptSrc ?? '';
 			$policy .= ';';
 		}
 
diff --git a/tests/lib/AppFramework/Http/ContentSecurityPolicyTest.php b/tests/lib/AppFramework/Http/ContentSecurityPolicyTest.php
index 8e6ac32b416..97412f1de23 100644
--- a/tests/lib/AppFramework/Http/ContentSecurityPolicyTest.php
+++ b/tests/lib/AppFramework/Http/ContentSecurityPolicyTest.php
@@ -25,19 +25,19 @@ 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';form-action 'self'";
+		$defaultPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' www.owncloud.com;script-src-elem 'strict-dynamic' '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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' www.owncloud.com www.owncloud.org;script-src-elem 'strict-dynamic' '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');
@@ -45,7 +45,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -53,7 +53,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' www.owncloud.com;script-src-elem 'strict-dynamic' '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');
@@ -61,7 +61,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -69,21 +69,21 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 	}
 
 	public function testGetPolicyScriptDisallowEval() {
-		$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'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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->allowEvalScript(false);
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 
 	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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -91,7 +91,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -99,7 +99,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -107,7 +107,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -115,35 +115,35 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -151,7 +151,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -159,7 +159,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -167,7 +167,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -175,14 +175,14 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -190,7 +190,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -198,7 +198,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -206,7 +206,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -214,14 +214,14 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -229,7 +229,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -237,7 +237,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -245,7 +245,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -253,14 +253,14 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -268,7 +268,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -276,7 +276,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -284,7 +284,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -292,14 +292,14 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -307,7 +307,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -315,7 +315,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -323,7 +323,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -331,14 +331,14 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -346,7 +346,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -354,7 +354,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -362,7 +362,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -370,14 +370,14 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -385,7 +385,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -393,7 +393,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -401,7 +401,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -411,14 +411,14 @@ 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;form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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;form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -426,7 +426,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -434,7 +434,7 @@ 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;form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -442,7 +442,7 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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');
@@ -450,14 +450,14 @@ 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';form-action 'self'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' 'unsafe-eval';script-src-elem 'strict-dynamic' '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());
 	}
 
 	public function testGetPolicyUnsafeWasmEval() {
-		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' 'wasm-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'";
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' 'wasm-unsafe-eval';script-src-elem 'strict-dynamic' 'self' 'wasm-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->allowEvalWasm(true);
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
@@ -468,6 +468,15 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'nonce-".base64_encode($nonce) . "';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'";
 
 		$this->contentSecurityPolicy->useJsNonce($nonce);
+		$this->contentSecurityPolicy->useStrictDynamicOnScripts(false);
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyNonceDefault() {
+		$nonce = 'my-nonce';
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'nonce-".base64_encode($nonce) . "';script-src-elem 'strict-dynamic' 'nonce-".base64_encode($nonce) . "';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'";
+
+		$this->contentSecurityPolicy->useJsNonce($nonce);
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 
@@ -477,6 +486,31 @@ class ContentSecurityPolicyTest extends \Test\TestCase {
 
 		$this->contentSecurityPolicy->useJsNonce($nonce);
 		$this->contentSecurityPolicy->useStrictDynamic(true);
+		$this->contentSecurityPolicy->useStrictDynamicOnScripts(false);
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyNonceStrictDynamicDefault() {
+		$nonce = 'my-nonce';
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'strict-dynamic' 'nonce-".base64_encode($nonce) . "';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'";
+
+		$this->contentSecurityPolicy->useJsNonce($nonce);
+		$this->contentSecurityPolicy->useStrictDynamic(true);
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyStrictDynamicOnScriptsOff() {
+		$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->useStrictDynamicOnScripts(false);
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyStrictDynamicAndStrictDynamicOnScripts() {
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';script-src-elem 'strict-dynamic' '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->useStrictDynamic(true);
+		$this->contentSecurityPolicy->useStrictDynamicOnScripts(true);
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 }
diff --git a/tests/lib/AppFramework/Http/EmptyContentSecurityPolicyTest.php b/tests/lib/AppFramework/Http/EmptyContentSecurityPolicyTest.php
index 328e464f981..31fc2ffc785 100644
--- a/tests/lib/AppFramework/Http/EmptyContentSecurityPolicyTest.php
+++ b/tests/lib/AppFramework/Http/EmptyContentSecurityPolicyTest.php
@@ -425,6 +425,42 @@ class EmptyContentSecurityPolicyTest extends \Test\TestCase {
 		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
 	}
 
+	public function testGetPolicyWithJsNonceAndStrictDynamic() {
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'strict-dynamic' 'nonce-TXlKc05vbmNl' www.nextcloud.com;frame-ancestors 'none'";
+
+		$this->contentSecurityPolicy->addAllowedScriptDomain('www.nextcloud.com');
+		$this->contentSecurityPolicy->useStrictDynamic(true);
+		$this->contentSecurityPolicy->useJsNonce('MyJsNonce');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyWithJsNonceAndStrictDynamicAndStrictDynamicOnScripts() {
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'strict-dynamic' 'nonce-TXlKc05vbmNl' www.nextcloud.com;frame-ancestors 'none'";
+
+		$this->contentSecurityPolicy->addAllowedScriptDomain('www.nextcloud.com');
+		$this->contentSecurityPolicy->useStrictDynamic(true);
+		$this->contentSecurityPolicy->useStrictDynamicOnScripts(true);
+		$this->contentSecurityPolicy->useJsNonce('MyJsNonce');
+		// Should be same as `testGetPolicyWithJsNonceAndStrictDynamic` because of fallback
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyWithJsNonceAndStrictDynamicOnScripts() {
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'nonce-TXlKc05vbmNl' www.nextcloud.com;script-src-elem 'strict-dynamic' 'nonce-TXlKc05vbmNl' www.nextcloud.com;frame-ancestors 'none'";
+
+		$this->contentSecurityPolicy->addAllowedScriptDomain('www.nextcloud.com');
+		$this->contentSecurityPolicy->useStrictDynamicOnScripts(true);
+		$this->contentSecurityPolicy->useJsNonce('MyJsNonce');
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
+	public function testGetPolicyWithStrictDynamicOnScripts() {
+		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src-elem 'strict-dynamic' ;frame-ancestors 'none'";
+
+		$this->contentSecurityPolicy->useStrictDynamicOnScripts(true);
+		$this->assertSame($expectedPolicy, $this->contentSecurityPolicy->buildPolicy());
+	}
+
 	public function testGetPolicyWithJsNonceAndSelfScriptDomain() {
 		$expectedPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'nonce-TXlKc05vbmNl';frame-ancestors 'none'";
 
diff --git a/tests/lib/Security/CSP/ContentSecurityPolicyManagerTest.php b/tests/lib/Security/CSP/ContentSecurityPolicyManagerTest.php
index 24acd3cabc9..0af73f10c65 100644
--- a/tests/lib/Security/CSP/ContentSecurityPolicyManagerTest.php
+++ b/tests/lib/Security/CSP/ContentSecurityPolicyManagerTest.php
@@ -72,7 +72,7 @@ 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-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";
+		$expectedStringPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' 'unsafe-eval';script-src-elem 'strict-dynamic' 'self' '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());
@@ -115,7 +115,7 @@ class ContentSecurityPolicyManagerTest extends TestCase {
 		$expected->addAllowedChildSrcDomain('childdomain');
 		$expected->addAllowedFormActionDomain('thirdDomain');
 		$expected->useStrictDynamic(true);
-		$expectedStringPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' '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";
+		$expectedStringPolicy = "default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self' 'unsafe-eval';script-src-elem 'strict-dynamic' 'self' '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());