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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "extensions/browser/extension_util.h"
#include <algorithm>
#include "base/barrier_closure.h"
#include "base/command_line.h"
#include "base/no_destructor.h"
#include "base/strings/string_util.h"
#include "build/chromeos_buildflags.h"
#include "components/crx_file/id_util.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/child_process_security_policy.h"
#include "content/public/browser/site_instance.h"
#include "content/public/browser/storage_partition.h"
#include "content/public/browser/storage_partition_config.h"
#include "extensions/browser/extension_host.h"
#include "extensions/browser/extension_prefs.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/browser/extension_system.h"
#include "extensions/browser/extension_util.h"
#include "extensions/browser/extensions_browser_client.h"
#include "extensions/browser/process_manager.h"
#include "extensions/browser/process_map.h"
#include "extensions/browser/script_injection_tracker.h"
#include "extensions/browser/ui_util.h"
#include "extensions/common/extension.h"
#include "extensions/common/extension_id.h"
#include "extensions/common/extension_set.h"
#include "extensions/common/feature_switch.h"
#include "extensions/common/features/feature.h"
#include "extensions/common/manifest.h"
#include "extensions/common/manifest_handlers/incognito_info.h"
#include "extensions/common/manifest_handlers/shared_module_info.h"
#include "extensions/common/mojom/manifest.mojom.h"
#include "extensions/common/permissions/permissions_data.h"
#include "extensions/common/switches.h"
#include "extensions/grit/extensions_browser_resources.h"
#include "mojo/public/cpp/bindings/clone_traits.h"
#include "ui/base/resource/resource_bundle.h"
#include "url/gurl.h"
#if BUILDFLAG(IS_CHROMEOS)
#include "chromeos/constants/chromeos_features.h"
#include "chromeos/constants/pref_names.h"
#include "components/prefs/pref_service.h"
#endif
#if BUILDFLAG(IS_CHROMEOS)
#include "base/system/sys_info.h"
#endif
namespace extensions {
namespace util {
namespace {
#if BUILDFLAG(IS_CHROMEOS)
bool IsSigninProfileTestExtensionOnTestImage(const Extension* extension) {
if (extension->id() != extension_misc::kSigninProfileTestExtensionId) {
return false;
}
base::SysInfo::CrashIfChromeOSNonTestImage();
return true;
}
#endif
// Returns `true` if `extension` was installed from the webstore, otherwise
// false.
bool ExtensionIsFromWebstore(const Extension& extension) {
return extension.from_webstore() && !extension.was_installed_by_default() &&
extension.location() == mojom::ManifestLocation::kInternal;
}
} // namespace
bool CanBeIncognitoEnabled(const Extension* extension) {
return IncognitoInfo::IsIncognitoAllowed(extension) &&
(!extension->is_platform_app() ||
extension->location() == mojom::ManifestLocation::kComponent);
}
bool IsIncognitoEnabled(const ExtensionId& extension_id,
content::BrowserContext* context) {
const Extension* extension =
ExtensionRegistry::Get(context)->enabled_extensions().GetByID(
extension_id);
if (extension) {
if (!CanBeIncognitoEnabled(extension)) {
return false;
}
// If this is an existing component extension we always allow it to
// work in incognito mode.
if (Manifest::IsComponentLocation(extension->location())) {
return true;
}
if (extension->is_login_screen_extension()) {
return true;
}
#if BUILDFLAG(IS_CHROMEOS)
if (IsSigninProfileTestExtensionOnTestImage(extension)) {
return true;
}
#endif
}
#if BUILDFLAG(IS_CHROMEOS)
// An OTR Profile is used for captive portal signin to hide PII from
// captive portals (which require HTTP redirects to function).
// However, for captive portal signin we do not want want to disable
// extensions by default. (Proxies are explicitly disabled elsewhere).
// See b/261727502 for details.
PrefService* prefs =
ExtensionsBrowserClient::Get()->GetPrefServiceForContext(context);
if (prefs) {
const PrefService::Preference* captive_portal_pref =
prefs->FindPreference(chromeos::prefs::kCaptivePortalSignin);
if (captive_portal_pref && captive_portal_pref->GetValue()->GetBool()) {
return true;
}
}
#endif
return ExtensionPrefs::Get(context)->IsIncognitoEnabled(extension_id);
}
bool CanCrossIncognito(const Extension* extension,
content::BrowserContext* context) {
// We allow the extension to see events and data from another profile iff it
// uses "spanning" behavior and it has incognito access. "split" mode
// extensions only see events for a matching profile.
CHECK(extension);
return IsIncognitoEnabled(extension->id(), context) &&
!IncognitoInfo::IsSplitMode(extension);
}
bool IsExtensionIdle(const std::string& extension_id,
content::BrowserContext* context) {
std::vector<std::string> ids_to_check;
ids_to_check.push_back(extension_id);
const Extension* extension =
ExtensionRegistry::Get(context)->enabled_extensions().GetByID(
extension_id);
if (extension && extension->is_shared_module()) {
// We have to check all the extensions that use this shared module for idle
// to tell whether it is really 'idle'.
std::unique_ptr<ExtensionSet> dependents =
ExtensionSystem::Get(context)->GetDependentExtensions(extension);
for (const auto& dependent : *dependents) {
ids_to_check.push_back(dependent->id());
}
}
ProcessManager* process_manager = ProcessManager::Get(context);
ProcessMap* process_map = ProcessMap::Get(context);
for (const auto& id : ids_to_check) {
ExtensionHost* host = process_manager->GetBackgroundHostForExtension(id);
if (host) {
return false;
}
if (!process_manager->GetRenderFrameHostsForExtension(id).empty()) {
return false;
}
// TODO(devlin): We can probably remove the checks above (for background
// hosts and frame hosts). If an extension has any active frames, it should
// have a dedicated process.
if (process_map->ExtensionHasProcess(id)) {
return false;
}
}
return true;
}
bool IsPromptingEnabled() {
return FeatureSwitch::prompt_for_external_extensions()->IsEnabled();
}
bool AllowFileAccess(const ExtensionId& extension_id,
content::BrowserContext* context) {
return base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kDisableExtensionsFileAccessCheck) ||
ExtensionPrefs::Get(context)->AllowFileAccess(extension_id);
}
const std::string& GetPartitionDomainForExtension(const Extension* extension) {
// Extensions use their own ID for a partition domain.
return extension->id();
}
content::StoragePartitionConfig GetStoragePartitionConfigForExtensionId(
const ExtensionId& extension_id,
content::BrowserContext* browser_context) {
if (ExtensionsBrowserClient::Get()->HasIsolatedStorage(extension_id,
browser_context)) {
// For extensions with isolated storage, the |extension_id| is
// the |partition_domain|. The |in_memory| and |partition_name| are only
// used in guest schemes so they are cleared here.
return content::StoragePartitionConfig::Create(
browser_context, extension_id, std::string() /* partition_name */,
false /*in_memory */);
}
return content::StoragePartitionConfig::CreateDefault(browser_context);
}
content::StoragePartition* GetStoragePartitionForExtensionId(
const ExtensionId& extension_id,
content::BrowserContext* browser_context,
bool can_create) {
auto storage_partition_config =
GetStoragePartitionConfigForExtensionId(extension_id, browser_context);
content::StoragePartition* storage_partition =
browser_context->GetStoragePartition(storage_partition_config,
can_create);
return storage_partition;
}
content::ServiceWorkerContext* GetServiceWorkerContextForExtensionId(
const ExtensionId& extension_id,
content::BrowserContext* browser_context) {
return GetStoragePartitionForExtensionId(extension_id, browser_context)
->GetServiceWorkerContext();
}
// This function is security sensitive. Bugs could cause problems that break
// restrictions on local file access or NaCl's validation caching. If you modify
// this function, please get a security review from a NaCl person.
bool MapUrlToLocalFilePath(const ExtensionSet* extensions,
const GURL& file_url,
bool use_blocking_api,
base::FilePath* file_path) {
// Check that the URL is recognized by the extension system.
const Extension* extension = extensions->GetExtensionOrAppByURL(file_url);
if (!extension) {
return false;
}
// This is a short-cut which avoids calling a blocking file operation
// (GetFilePath()), so that this can be called on the non blocking threads. It
// only handles a subset of the urls.
if (!use_blocking_api) {
if (file_url.SchemeIs(kExtensionScheme)) {
std::string path = file_url.path();
base::TrimString(path, "/", &path); // Remove first slash
*file_path = extension->path().AppendASCII(path);
return true;
}
return false;
}
std::string path = file_url.path();
ExtensionResource resource;
if (SharedModuleInfo::IsImportedPath(path)) {
// Check if this is a valid path that is imported for this extension.
ExtensionId new_extension_id;
std::string new_relative_path;
SharedModuleInfo::ParseImportedPath(path, &new_extension_id,
&new_relative_path);
const Extension* new_extension = extensions->GetByID(new_extension_id);
if (!new_extension) {
return false;
}
if (!SharedModuleInfo::ImportsExtensionById(extension, new_extension_id)) {
return false;
}
resource = new_extension->GetResource(new_relative_path);
} else {
// Check that the URL references a resource in the extension.
resource = extension->GetResource(path);
}
if (resource.empty()) {
return false;
}
// GetFilePath is a blocking function call.
const base::FilePath resource_file_path = resource.GetFilePath();
if (resource_file_path.empty()) {
return false;
}
*file_path = resource_file_path;
return true;
}
bool CanWithholdPermissionsFromExtension(const Extension& extension) {
return CanWithholdPermissionsFromExtension(
extension.id(), extension.GetType(), extension.location());
}
bool CanWithholdPermissionsFromExtension(const ExtensionId& extension_id,
Manifest::Type type,
mojom::ManifestLocation location) {
// Some extensions must retain privilege to all requested host permissions.
// Specifically, extensions that don't show up in chrome:extensions (where
// withheld permissions couldn't be granted), extensions that are part of
// chrome or corporate policy, and extensions that are allowlisted to script
// everywhere must always have permission to run on a page.
return ui_util::ShouldDisplayInExtensionSettings(type, location) &&
!Manifest::IsPolicyLocation(location) &&
!Manifest::IsComponentLocation(location) &&
!PermissionsData::CanExecuteScriptEverywhere(extension_id, location);
}
int GetBrowserContextId(content::BrowserContext* context) {
using ContextIdMap = std::map<std::string, int>;
static int next_id = 0;
static base::NoDestructor<ContextIdMap> context_map;
// we need to get the original context to make sure we take the right context.
content::BrowserContext* original_context =
ExtensionsBrowserClient::Get()->GetOriginalContext(context);
const std::string& context_id = original_context->UniqueId();
auto iter = context_map->find(context_id);
if (iter == context_map->end()) {
iter = context_map->insert(std::make_pair(context_id, next_id++)).first;
}
DCHECK(iter->second != kUnspecifiedContextId);
return iter->second;
}
bool IsExtensionVisibleToContext(const Extension& extension,
content::BrowserContext* browser_context) {
// Renderers don't need to know about themes.
if (extension.is_theme()) {
return false;
}
// Only extensions enabled in incognito mode should be loaded in an incognito
// renderer. However extensions which can't be enabled in the incognito mode
// (e.g. platform apps) should also be loaded in an incognito renderer to
// ensure connections from incognito tabs to such extensions work.
return !browser_context->IsOffTheRecord() ||
!CanBeIncognitoEnabled(&extension) ||
IsIncognitoEnabled(extension.id(), browser_context);
}
void InitializeFileSchemeAccessForExtension(
int render_process_id,
const ExtensionId& extension_id,
content::BrowserContext* browser_context) {
ExtensionPrefs* prefs = ExtensionPrefs::Get(browser_context);
// TODO(karandeepb): This should probably use
// extensions::util::AllowFileAccess.
if (prefs->AllowFileAccess(extension_id)) {
content::ChildProcessSecurityPolicy::GetInstance()->GrantRequestScheme(
render_process_id, url::kFileScheme);
}
}
const gfx::ImageSkia& GetDefaultAppIcon() {
return *ui::ResourceBundle::GetSharedInstance().GetImageSkiaNamed(
IDR_APP_DEFAULT_ICON);
}
const gfx::ImageSkia& GetDefaultExtensionIcon() {
return *ui::ResourceBundle::GetSharedInstance().GetImageSkiaNamed(
IDR_EXTENSION_DEFAULT_ICON);
}
ExtensionId GetExtensionIdForSiteInstance(
content::SiteInstance& site_instance) {
// <webview> guests always store the ExtensionId in the partition domain.
if (site_instance.IsGuest()) {
return site_instance.GetStoragePartitionConfig().partition_domain();
}
// This works for both apps and extensions because the site has been
// normalized to the extension URL for hosted apps.
const GURL& site_url = site_instance.GetSiteURL();
if (!site_url.SchemeIs(kExtensionScheme)) {
return ExtensionId();
}
// Navigating to a disabled (or uninstalled or not-yet-installed) extension
// will set the site URL to chrome-extension://invalid.
ExtensionId maybe_extension_id = site_url.host();
if (maybe_extension_id == "invalid") {
return ExtensionId();
}
// Otherwise,`site_url.host()` should always be a valid extension id. In
// particular, navigations should never commit a URL that uses a dynamic,
// GUID-based hostname (such navigations should redirect to the statically
// known, extension-id-based hostname).
DCHECK(crx_file::id_util::IdIsValid(maybe_extension_id))
<< "; maybe_extension_id = " << maybe_extension_id;
return maybe_extension_id;
}
std::string GetExtensionIdFromFrame(
content::RenderFrameHost* render_frame_host) {
const GURL& site = render_frame_host->GetSiteInstance()->GetSiteURL();
if (!site.SchemeIs(kExtensionScheme)) {
return std::string();
}
return site.host();
}
bool CanRendererHostExtensionOrigin(int render_process_id,
const ExtensionId& extension_id,
bool is_sandboxed) {
url::Origin extension_origin =
Extension::CreateOriginFromExtensionId(extension_id);
if (is_sandboxed) {
// If the extension frame is sandboxed, the corresponding process is only
// allowed to host opaque origins, per crbug.com/325410297. Therefore,
// convert the origin into an opaque origin, and note that HostsOrigin()
// will still validate the extension ID in the origin's precursor.
extension_origin = extension_origin.DeriveNewOpaqueOrigin();
}
auto* policy = content::ChildProcessSecurityPolicy::GetInstance();
return policy->HostsOrigin(render_process_id, extension_origin);
}
bool CanRendererActOnBehalfOfExtension(
const ExtensionId& extension_id,
content::RenderFrameHost* render_frame_host,
content::RenderProcessHost& render_process_host,
bool include_user_scripts) {
// TODO(lukasza): Some of the checks below can be restricted to specific
// context types (e.g. an empty `extension_id` should not happen in an
// extension context; and the SiteInstance-based check should only be needed
// for hosted apps). Consider leveraging ProcessMap::GetMostLikelyContextType
// to implement this kind of restrictions. Note that
// ExtensionFunctionDispatcher::CreateExtensionFunction already calls
// GetMostLikelyContextType - some refactoring might be needed to avoid
// duplicating the work.
// Allow empty extension id (it seems okay to assume that no
// extension-specific special powers will be granted without an extension id).
// For instance, WebUI pages may call private APIs like developerPrivate,
// settingsPrivate, metricsPrivate, and others. In these cases, there is no
// associated extension ID.
//
// TODO(lukasza): Investigate if the exception below can be avoided if
// `render_process_host` hosts HTTP origins (i.e. if the exception can be
// restricted to NTP, and/or chrome://... cases.
if (extension_id.empty()) {
return true;
}
// Did `render_process_id` run a content script or user script from
// `extension_id`?
// TODO(crbug.com/40055126): Ideally, we'd only check content script/
// user script status if the renderer claimed to be acting on behalf of the
// corresponding type (e.g. mojom::ContextType::kContentScript). We evaluate
// this later in ProcessMap::CanProcessHostContextType(), but we could be
// stricter by including it here.
if (ScriptInjectionTracker::DidProcessRunContentScriptFromExtension(
render_process_host, extension_id) ||
(ScriptInjectionTracker::DidProcessRunUserScriptFromExtension(
render_process_host, extension_id) &&
include_user_scripts)) {
return true;
}
// CanRendererHostExtensionOrigin() needs to know if the extension is
// sandboxed, so check the sandbox flags if this request is for an extension
// frame. Note that extension workers cannot be sandboxed since workers aren't
// supported in opaque origins.
bool is_sandboxed =
render_frame_host &&
render_frame_host->IsSandboxed(network::mojom::WebSandboxFlags::kOrigin);
// Can `render_process_id` host a chrome-extension:// origin (frame, worker,
// etc.)?
if (CanRendererHostExtensionOrigin(render_process_host.GetDeprecatedID(),
extension_id, is_sandboxed)) {
return true;
}
if (render_frame_host) {
DCHECK_EQ(render_process_host.GetDeprecatedID(),
render_frame_host->GetProcess()->GetDeprecatedID());
content::SiteInstance& site_instance =
*render_frame_host->GetSiteInstance();
// Chrome Extension APIs can be accessed from some hosted apps.
//
// Today this is mostly needed by the Chrome Web Store's hosted app, but the
// code below doesn't make this assumption and allows *all* hosted apps
// based on the trustworthy, Browser-side information from the SiteInstance
// / SiteURL. This way the code is resilient to future changes + there are
// concerns that `chrome.test.sendMessage` might already be exposed to
// hosted apps (but maybe not covered by tests).
//
// Note that the condition below allows all extensions (i.e. not just hosted
// apps), but hosted apps aren't covered by the
// `CanRendererHostExtensionOrigin` call above (because the process lock of
// hosted apps is based on a https://, rather than chrome-extension:// url).
//
// GuestView is explicitly excluded, because we don't want to allow
// GuestViews to spoof the extension id of their host.
if (!site_instance.IsGuest() &&
extension_id == util::GetExtensionIdForSiteInstance(site_instance)) {
return true;
}
}
// Disallow any other cases.
return false;
}
bool IsChromeApp(const ExtensionId& extension_id,
content::BrowserContext* context) {
const Extension* extension =
ExtensionRegistry::Get(context)->enabled_extensions().GetByID(
extension_id);
return extension->is_platform_app();
}
bool IsAppLaunchable(const ExtensionId& extension_id,
content::BrowserContext* context) {
DisableReasonSet reason =
ExtensionPrefs::Get(context)->GetDisableReasons(extension_id);
return !reason.contains(disable_reason::DISABLE_UNSUPPORTED_REQUIREMENT) &&
!reason.contains(disable_reason::DISABLE_CORRUPTED);
}
bool IsAppLaunchableWithoutEnabling(const ExtensionId& extension_id,
content::BrowserContext* context) {
return ExtensionRegistry::Get(context)->enabled_extensions().Contains(
extension_id);
}
bool AnyCurrentlyInstalledExtensionIsFromWebstore(
content::BrowserContext* context) {
const ExtensionSet previously_installed_extensions =
ExtensionRegistry::Get(context)->GenerateInstalledExtensionsSet();
return std::ranges::any_of(previously_installed_extensions,
[](const auto& extension_ptr) {
return ExtensionIsFromWebstore(*extension_ptr);
});
}
} // namespace util
} // namespace extensions
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