Add policy controlled permission block list for extensions

chrome/browser/extensions/permissions_based_management_policy_provider_unittest.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 <string>
+#include <vector>
+
+#include "base/logging.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/prefs/pref_registry_simple.h"
+#include "base/prefs/testing_pref_service.h"
+#include "base/stl_util.h"
+#include "base/strings/string16.h"
+#include "base/values.h"
+#include "chrome/browser/extensions/extension_management.h"
+#include "chrome/browser/extensions/extension_management_test_util.h"
+#include "chrome/browser/extensions/permissions_based_management_policy_provider.h"
+#include "chrome/common/extensions/permissions/chrome_api_permissions.h"
+#include "extensions/common/extension.h"
+#include "extensions/common/manifest.h"
+#include "extensions/common/manifest_constants.h"
+#include "extensions/common/permissions/api_permission.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace extensions {
+
+class PermissionsBasedManagementPolicyProviderTest : public testing::Test {
+ public:
+  typedef ExtensionManagementPrefUpdater<TestingPrefServiceSimple> PrefUpdater;
+
+  PermissionsBasedManagementPolicyProviderTest()
+      : pref_service_(new TestingPrefServiceSimple()),
+        settings_(new ExtensionManagement(pref_service_.get())),
+        provider_(settings_.get()) {}
+
+  void SetUp() override {
+    ChromeAPIPermissions api_permissions;
+    perm_list_ = api_permissions.GetAllPermissions();
+    pref_service_->registry()->RegisterDictionaryPref(
+        pref_names::kExtensionManagement);
+  }
+
+  void TearDown() override {
+    STLDeleteElements(&perm_list_);
+  }
+
+  // Get API permissions name for |id|, we cannot use arbitrary strings since
+  // they will be ignored by ExtensionManagementService.
+  std::string GetAPIPermissionName(APIPermission::ID id) {
+    for (const auto& perm : perm_list_) {
+      if (perm->id() == id)
+        return perm->name();
+    }
+    ADD_FAILURE() << "Permission not found: " << id;
+    return std::string();
+  }
+
+  // Create an extension with specified |location|, |required_permissions| and
+  // |optional_permissions|.
+  scoped_refptr<const Extension> CreateExtensionWithPermission(
+      Manifest::Location location,
+      const base::ListValue* required_permissions,
+      const base::ListValue* optional_permissions) {
+    base::DictionaryValue manifest_dict;
+    manifest_dict.SetString(manifest_keys::kName, "test");
+    manifest_dict.SetString(manifest_keys::kVersion, "0.1");
+    if (required_permissions) {
+      manifest_dict.Set(manifest_keys::kPermissions,
+                        required_permissions->DeepCopy());
+    }
+    if (optional_permissions) {
+      manifest_dict.Set(manifest_keys::kOptionalPermissions,
+                        optional_permissions->DeepCopy());
+    }
+    std::string error;
+    scoped_refptr<const Extension> extension = Extension::Create(
+        base::FilePath(), location, manifest_dict, Extension::NO_FLAGS, &error);
+    CHECK(extension.get()) << error;
+    return extension;
+  }
+
+ protected:
+  std::vector<APIPermissionInfo*> perm_list_;
+
+  scoped_ptr<TestingPrefServiceSimple> pref_service_;
+  scoped_ptr<ExtensionManagement> settings_;
+
+  PermissionsBasedManagementPolicyProvider provider_;
+};
+
+// Verifies that extensions with conflicting permissions cannot be loaded.
+TEST_F(PermissionsBasedManagementPolicyProviderTest, APIPermissions) {
+  // Prepares the extension manifest.
+  base::ListValue required_permissions;
+  required_permissions.AppendString(
+      GetAPIPermissionName(APIPermission::kDownloads));
+  required_permissions.AppendString(
+      GetAPIPermissionName(APIPermission::kCookie));
+  base::ListValue optional_permissions;
+  optional_permissions.AppendString(
+      GetAPIPermissionName(APIPermission::kProxy));
+
+  scoped_refptr<const Extension> extension =
+      CreateExtensionWithPermission(Manifest::EXTERNAL_POLICY_DOWNLOAD,
+                                    &required_permissions,
+                                    &optional_permissions);
+
+  base::string16 error16;
+  // The extension should be allowed to be loaded by default.
+  error16.clear();
+  EXPECT_TRUE(provider_.UserMayLoad(extension.get(), &error16));
+  EXPECT_TRUE(error16.empty());
+
+  // Blocks kProxy by default. The test extension should still be allowed.
+  {
+    PrefUpdater pref(pref_service_.get());
+    pref.AddBlockedPermission("*",
+                              GetAPIPermissionName(APIPermission::kProxy));
+  }
+  error16.clear();
+  EXPECT_TRUE(provider_.UserMayLoad(extension.get(), &error16));
+  EXPECT_TRUE(error16.empty());
+
+  // Blocks kCookie this time. The test extension should not be allowed now.
+  {
+    PrefUpdater pref(pref_service_.get());
+    pref.AddBlockedPermission("*",
+                              GetAPIPermissionName(APIPermission::kCookie));
+  }
+  error16.clear();
+  EXPECT_FALSE(provider_.UserMayLoad(extension.get(), &error16));
+  EXPECT_FALSE(error16.empty());
+
+  // Explictly allows kCookie for test extension. It should be allowed again.
+  {
+    PrefUpdater pref(pref_service_.get());
+    pref.AddAllowedPermission(extension->id(),
+                              GetAPIPermissionName(APIPermission::kCookie));
+  }
+  error16.clear();
+  EXPECT_TRUE(provider_.UserMayLoad(extension.get(), &error16));
+  EXPECT_TRUE(error16.empty());
+
+  // Explictly blocks kCookie for test extension. It should be blocked again.
+  {
+    PrefUpdater pref(pref_service_.get());
+    pref.AddBlockedPermission(extension->id(),
+                              GetAPIPermissionName(APIPermission::kCookie));
+  }
+  error16.clear();
+  EXPECT_FALSE(provider_.UserMayLoad(extension.get(), &error16));
+  EXPECT_FALSE(error16.empty());
+
+  // Blocks kDownloads by default. It should be blocked.
+  {
+    PrefUpdater pref(pref_service_.get());
+    pref.UnsetBlockedPermissions(extension->id());
+    pref.UnsetAllowedPermissions(extension->id());
+    pref.ClearBlockedPermissions("*");
+    pref.AddBlockedPermission("*",
+                              GetAPIPermissionName(APIPermission::kDownloads));
+  }
+  error16.clear();
+  EXPECT_FALSE(provider_.UserMayLoad(extension.get(), &error16));
+  EXPECT_FALSE(error16.empty());
+}
+
+}  // namespace extensions