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// Copyright (c) 2010 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/extension_protocols.h"
#include <algorithm>
#include "app/resource_bundle.h"
#include "base/file_path.h"
#include "base/logging.h"
#include "base/message_loop.h"
#include "base/path_service.h"
#include "base/string_util.h"
#include "base/thread_restrictions.h"
#include "build/build_config.h"
#include "chrome/browser/net/chrome_url_request_context.h"
#include "chrome/browser/renderer_host/resource_dispatcher_host.h"
#include "chrome/browser/renderer_host/resource_dispatcher_host_request_info.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/extensions/extension.h"
#include "chrome/common/extensions/extension_file_util.h"
#include "chrome/common/extensions/extension_resource.h"
#include "chrome/common/url_constants.h"
#include "googleurl/src/url_util.h"
#include "grit/bookmark_manager_resources_map.h"
#include "net/base/mime_util.h"
#include "net/base/net_errors.h"
#include "net/url_request/url_request_error_job.h"
#include "net/url_request/url_request_file_job.h"
#include "net/url_request/url_request_simple_job.h"
namespace {
class URLRequestResourceBundleJob : public URLRequestSimpleJob {
public:
explicit URLRequestResourceBundleJob(URLRequest* request,
const FilePath& filename, int resource_id)
: URLRequestSimpleJob(request),
filename_(filename),
resource_id_(resource_id) { }
// URLRequestSimpleJob method.
virtual bool GetData(std::string* mime_type,
std::string* charset,
std::string* data) const {
const ResourceBundle& rb = ResourceBundle::GetSharedInstance();
*data = rb.GetRawDataResource(resource_id_).as_string();
bool result = net::GetMimeTypeFromFile(filename_, mime_type);
if (StartsWithASCII(*mime_type, "text/", false)) {
// All of our HTML files should be UTF-8 and for other resource types
// (like images), charset doesn't matter.
DCHECK(IsStringUTF8(*data));
*charset = "utf-8";
}
return result;
}
private:
virtual ~URLRequestResourceBundleJob() { }
// We need the filename of the resource to determine the mime type.
FilePath filename_;
// The resource bundle id to load.
int resource_id_;
};
// Returns true if an chrome-extension:// resource should be allowed to load.
bool AllowExtensionResourceLoad(URLRequest* request,
ChromeURLRequestContext* context,
const std::string& scheme) {
const ResourceDispatcherHostRequestInfo* info =
ResourceDispatcherHost::InfoForRequest(request);
// We have seen crashes where info is NULL: crbug.com/52374.
if (!info) {
LOG(ERROR) << "Allowing load of " << request->url().spec()
<< "from unknown origin. Could not find user data for "
<< "request.";
return true;
}
GURL origin_url(info->frame_origin());
// chrome:// URLs are always allowed to load chrome-extension:// resources.
// The app launcher in the NTP uses this feature, as does dev tools.
if (origin_url.SchemeIs(chrome::kChromeDevToolsScheme) ||
origin_url.SchemeIs(chrome::kChromeUIScheme))
return true;
// Disallow loading of packaged resources for hosted apps. We don't allow
// hybrid hosted/packaged apps. The one exception is access to icons, since
// some extensions want to be able to do things like create their own
// launchers.
if (context->extension_info_map()->
ExtensionHasWebExtent(request->url().host())) {
if (!context->extension_info_map()->URLIsForExtensionIcon(request->url())) {
LOG(ERROR) << "Denying load of " << request->url().spec() << " from "
<< "hosted app.";
return false;
}
}
// Don't allow toplevel navigations to extension resources in incognito mode.
// This is because an extension must run in a single process, and an
// incognito tab prevents that.
if (context->is_off_the_record() &&
info->resource_type() == ResourceType::MAIN_FRAME &&
!context->extension_info_map()->
ExtensionCanLoadInIncognito(request->url().host())) {
LOG(ERROR) << "Denying load of " << request->url().spec() << " from "
<< "incognito tab.";
return false;
}
// Otherwise, pages are allowed to load resources from extensions if the
// extension has host permissions to (and therefore could be running script
// in, which might need access to the extension resources).
//
// Exceptions are:
// - empty origin (needed for some edge cases when we have empty origins)
// - chrome-extension:// (for legacy reasons -- some extensions interop)
// - data: (basic HTML notifications use data URLs internally)
if (origin_url.is_empty() ||
origin_url.SchemeIs(chrome::kExtensionScheme) |
origin_url.SchemeIs(chrome::kDataScheme)) {
return true;
} else {
ExtensionExtent host_permissions = context->extension_info_map()->
GetEffectiveHostPermissionsForExtension(request->url().host());
if (host_permissions.ContainsURL(origin_url)) {
return true;
} else {
LOG(ERROR) << "Denying load of " << request->url().spec() << " from "
<< origin_url.spec() << " because the extension does not have "
<< "access to the requesting page.";
return false;
}
}
}
} // namespace
// Factory registered with URLRequest to create URLRequestJobs for extension://
// URLs.
static URLRequestJob* CreateExtensionURLRequestJob(URLRequest* request,
const std::string& scheme) {
ChromeURLRequestContext* context =
static_cast<ChromeURLRequestContext*>(request->context());
// TODO(mpcomplete): better error code.
if (!AllowExtensionResourceLoad(request, context, scheme))
return new URLRequestErrorJob(request, net::ERR_ADDRESS_UNREACHABLE);
// chrome-extension://extension-id/resource/path.js
const std::string& extension_id = request->url().host();
FilePath directory_path = context->extension_info_map()->
GetPathForExtension(extension_id);
if (directory_path.value().empty()) {
LOG(WARNING) << "Failed to GetPathForExtension: " << extension_id;
return NULL;
}
FilePath resources_path;
if (PathService::Get(chrome::DIR_RESOURCES, &resources_path) &&
directory_path.DirName() == resources_path) {
FilePath relative_path = directory_path.BaseName().Append(
extension_file_util::ExtensionURLToRelativeFilePath(request->url()));
#if defined(OS_WIN)
relative_path = relative_path.NormalizeWindowsPathSeparators();
#endif
// TODO(tc): Make a map of FilePath -> resource ids so we don't have to
// covert to FilePaths all the time. This will be more useful as we add
// more resources.
for (size_t i = 0; i < kBookmarkManagerResourcesSize; ++i) {
FilePath bm_resource_path =
FilePath().AppendASCII(kBookmarkManagerResources[i].name);
#if defined(OS_WIN)
bm_resource_path = bm_resource_path.NormalizeWindowsPathSeparators();
#endif
if (relative_path == bm_resource_path) {
return new URLRequestResourceBundleJob(request, relative_path,
kBookmarkManagerResources[i].value);
}
}
}
// TODO(tc): Move all of these files into resources.pak so we don't break
// when updating on Linux.
ExtensionResource resource(extension_id, directory_path,
extension_file_util::ExtensionURLToRelativeFilePath(request->url()));
FilePath resource_file_path;
{
// Getting the file path will touch the file system. Fixing
// crbug.com/59849 would also fix this. Suppress the error for now.
base::ThreadRestrictions::ScopedAllowIO allow_io;
resource_file_path = resource.GetFilePath();
}
return new URLRequestFileJob(request, resource_file_path);
}
// Factory registered with URLRequest to create URLRequestJobs for
// chrome-user-script:/ URLs.
static URLRequestJob* CreateUserScriptURLRequestJob(URLRequest* request,
const std::string& scheme) {
ChromeURLRequestContext* context =
static_cast<ChromeURLRequestContext*>(request->context());
// chrome-user-script:/user-script-name.user.js
FilePath directory_path = context->user_script_dir_path();
ExtensionResource resource(request->url().host(), directory_path,
extension_file_util::ExtensionURLToRelativeFilePath(request->url()));
return new URLRequestFileJob(request, resource.GetFilePath());
}
void RegisterExtensionProtocols() {
URLRequest::RegisterProtocolFactory(chrome::kExtensionScheme,
&CreateExtensionURLRequestJob);
URLRequest::RegisterProtocolFactory(chrome::kUserScriptScheme,
&CreateUserScriptURLRequestJob);
}
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