Add policy controlled permission block list for extensions

chrome/browser/extensions/permissions_based_management_policy_provider.cc

+// Copyright 2014 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_based_management_policy_provider.h"
+
+#include "base/strings/string16.h"
+#include "base/strings/utf_string_conversions.h"
+#include "chrome/browser/extensions/extension_management.h"
+#include "extensions/common/extension.h"
+#include "extensions/common/manifest_handlers/permissions_parser.h"
+#include "extensions/common/permissions/permission_set.h"
+#include "grit/extensions_strings.h"
+#include "ui/base/l10n/l10n_util.h"
+
+namespace extensions {
+
+PermissionsBasedManagementPolicyProvider::
+    PermissionsBasedManagementPolicyProvider(ExtensionManagement* settings)
+    : settings_(settings) {
+}
+
+PermissionsBasedManagementPolicyProvider::
+    ~PermissionsBasedManagementPolicyProvider() {
+}
+
+std::string
+PermissionsBasedManagementPolicyProvider::GetDebugPolicyProviderName() const {
+#ifdef NDEBUG
+  NOTREACHED();
+  return std::string();
+#else
+  return "Controlled by enterprise policy, restricting extension permissions.";
+#endif
+}
+
+bool PermissionsBasedManagementPolicyProvider::UserMayLoad(
+    const Extension* extension,
+    base::string16* error) const {
+  // Component extensions are always allowed.
+  if (Manifest::IsComponentLocation(extension->location()))
+    return true;
+
+  scoped_refptr<const PermissionSet> required_permissions =
+      PermissionsParser::GetRequiredPermissions(extension);
+
+  if (!settings_->IsPermissionSetAllowed(extension->id(),
+                                         required_permissions)) {
+    if (error) {
+      *error =
+          l10n_util::GetStringFUTF16(IDS_EXTENSION_CANT_INSTALL_POLICY_BLOCKED,
+                                     base::UTF8ToUTF16(extension->name()),
+                                     base::UTF8ToUTF16(extension->id()));
+    }
+    return false;

[Joao da Silva, 2014/10/15 14:39:26]

What happens if a force-installed extension uses a permission that is globally
blocked? Does it still get installed or not?

[binjin, 2014/10/16 18:13:58]

It shouldn't be installed. Force installed extensions are installed from
ExternalProvider with policy location, but they're the same as other external
installed (except location) afterward. They will be checked against management
policy as well.

+  }
+
+  return true;
+}
+
+}  // namespace extensions