PS - Remove Clipboard Read permission from extensions in Public Sessions (except for whitelisted on…

chrome/browser/extensions/permissions_updater_delegate_chromeos.cc

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/extensions/permissions_updater_delegate_chromeos.h"
+
+#include "chrome/browser/chromeos/extensions/device_local_account_management_policy_provider.h"
+#include "chrome/browser/profiles/profiles_state.h"
+#include "extensions/common/permissions/api_permission.h"
+#include "extensions/common/permissions/api_permission_set.h"
+#include "extensions/common/permissions/manifest_permission_set.h"
+#include "extensions/common/permissions/permission_set.h"
+#include "extensions/common/url_pattern_set.h"
+
+namespace extensions {
+
+PermissionsUpdaterDelegateChromeOS::PermissionsUpdaterDelegateChromeOS() {}
+
+PermissionsUpdaterDelegateChromeOS::~PermissionsUpdaterDelegateChromeOS() {}
+
+void PermissionsUpdaterDelegateChromeOS::InitializePermissions(
+    PermissionsUpdater* permissions_updater,
+    const Extension* extension) {
+  if (!profiles::IsPublicSession() ||
+      chromeos::DeviceLocalAccountManagementPolicyProvider::IsWhitelisted(
+          extension)) {
+    return;
+  }
+
+  // Revoke kClipboardRead permission (used in Public Sessions to secure
+  // clipboard read functionality).
+  APIPermissionSet api_permission_set;
+  api_permission_set.insert(APIPermission::kClipboardRead);
+  PermissionSet permissions(api_permission_set, ManifestPermissionSet(),
+                            URLPatternSet(), URLPatternSet());
+  permissions_updater->RemovePermissionsUnsafe(extension, permissions);

[Devlin, 2017/04/05 14:35:20]

this does a lot of extra work (e.g. notifying subsystems that permissions were
removed, etc).  Since this is for initialization, we can instead just avoid ever
adding the permissions.  To do this, we could pass in a mutable pointer to the
granted permissions from InitializePermissions.

[Ivan Šandrk, 2017/04/07 14:39:40]

Thanks for the explanation, done.

+}
+
+}  // namespace extensions