Add local-network-access to iframe permissions policy

Author: jeanp413

src/vs/workbench/contrib/webview/browser/pre/index.html

@@ -1053,7 +1053,7 @@
 				}
 				newFrame.setAttribute('sandbox', Array.from(sandboxRules).join(' '));
 
-				const allowRules = ['cross-origin-isolated;', 'autoplay;'];
+				const allowRules = ['cross-origin-isolated;', 'autoplay;', 'local-network-access;'];
 				if (!isFirefox && options.allowScripts) {
 					allowRules.push('clipboard-read;', 'clipboard-write;');
 				}

src/vs/workbench/contrib/webview/browser/webviewElement.ts

@@ -402,7 +402,7 @@ export class WebviewElement extends Disposable implements IWebviewElement, Webvi
 		element.className = `webview ${options.customClasses || ''}`;
 		element.sandbox.add('allow-scripts', 'allow-same-origin', 'allow-forms', 'allow-pointer-lock', 'allow-downloads');
 
-		const allowRules = ['cross-origin-isolated', 'autoplay'];
+		const allowRules = ['cross-origin-isolated', 'autoplay', 'local-network-access'];
 		if (!isFirefox) {
 			allowRules.push('clipboard-read', 'clipboard-write');
 		}

src/vs/workbench/services/extensions/browser/webWorkerExtensionHost.ts

@@ -138,7 +138,7 @@ export class WebWorkerExtensionHost extends Disposable implements IExtensionHost
 		const iframe = document.createElement('iframe');
 		iframe.setAttribute('class', 'web-worker-ext-host-iframe');
 		iframe.setAttribute('sandbox', 'allow-scripts allow-same-origin');
-		iframe.setAttribute('allow', 'usb; serial; hid; cross-origin-isolated;');
+		iframe.setAttribute('allow', 'usb; serial; hid; cross-origin-isolated; local-network-access;');
 		iframe.setAttribute('aria-hidden', 'true');
 		iframe.style.display = 'none';