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content / browser / webui / url_data_manager_backend.cc [blame]
// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/webui/url_data_manager_backend.h"
#include <set>
#include <utility>
#include "base/containers/contains.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/memory/ptr_util.h"
#include "base/memory/ref_counted.h"
#include "base/memory/ref_counted_memory.h"
#include "base/no_destructor.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/task/single_thread_task_runner.h"
#include "base/trace_event/trace_event.h"
#include "base/values.h"
#include "content/browser/webui/shared_resources_data_source.h"
#include "content/browser/webui/url_data_source_impl.h"
#include "content/browser/webui/web_ui_data_source_impl.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/common/content_client.h"
#include "content/public/common/url_constants.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "net/filter/source_stream.h"
#include "net/http/http_request_headers.h"
#include "net/http/http_status_code.h"
#include "net/log/net_log_util.h"
#include "services/network/public/mojom/content_security_policy.mojom.h"
#include "ui/base/template_expressions.h"
#include "ui/base/webui/i18n_source_stream.h"
#include "url/url_util.h"
namespace content {
namespace {
const char kChromeURLContentSecurityPolicyHeaderName[] =
"Content-Security-Policy";
const char kChromeURLCrossOriginOpenerPolicyName[] =
"Cross-Origin-Opener-Policy";
const char kChromeURLCrossOriginEmbedderPolicyName[] =
"Cross-Origin-Embedder-Policy";
const char kChromeURLCrossOriginResourcePolicyName[] =
"Cross-Origin-Resource-Policy";
const char kChromeURLXFrameOptionsHeaderName[] = "X-Frame-Options";
const char kChromeURLXFrameOptionsHeaderValue[] = "DENY";
const char kNetworkErrorKey[] = "netError";
const char kURLDataManagerBackendKeyName[] = "url_data_manager_backend";
bool SchemeIsInSchemes(const std::string& scheme,
const std::vector<std::string>& schemes) {
return base::Contains(schemes, scheme);
}
bool g_disallow_webui_scheme_caching_for_testing = false;
std::vector<std::string> GetWebUISchemesSlow() {
std::vector<std::string> schemes;
schemes.emplace_back(kChromeUIScheme);
schemes.emplace_back(kChromeUIUntrustedScheme);
GetContentClient()->browser()->GetAdditionalWebUISchemes(&schemes);
return schemes;
}
std::vector<std::string> GetWebUISchemesCached() {
// It's OK to cache this in a static because the class implementing
// GetAdditionalWebUISchemes() won't change while the application is
// running, and because those methods always add the same items.
//
// However, be careful using this with unit tests which use
// GetAdditionalWebUISchemes() to change the list of WebUI schemes, since
// this caching may persist across tests. For those, this caching should be
// disabled via SetDisallowWebUISchemeCachingForTesting().
static base::NoDestructor<std::vector<std::string>> webui_schemes(
GetWebUISchemesSlow());
return *webui_schemes;
}
} // namespace
URLDataManagerBackend::URLDataManagerBackend() {
{
// Add a shared data source for chrome://resources.
auto* source = new WebUIDataSourceImpl(kChromeUIResourcesHost);
PopulateSharedResourcesDataSource(source);
AddDataSource(source); // Takes ownership.
}
{
// Add a shared data source for chrome-untrusted://resources.
auto* source = new WebUIDataSourceImpl(kChromeUIUntrustedResourcesURL);
PopulateSharedResourcesDataSource(source);
AddDataSource(source); // Takes ownership.
}
}
URLDataManagerBackend::~URLDataManagerBackend() = default;
URLDataManagerBackend* URLDataManagerBackend::GetForBrowserContext(
BrowserContext* context) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (!context->GetUserData(kURLDataManagerBackendKeyName)) {
context->SetUserData(kURLDataManagerBackendKeyName,
std::make_unique<URLDataManagerBackend>());
}
return static_cast<URLDataManagerBackend*>(
context->GetUserData(kURLDataManagerBackendKeyName));
}
void URLDataManagerBackend::AddDataSource(URLDataSourceImpl* source) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (!source->source()->ShouldReplaceExistingSource()) {
auto i = data_sources_.find(source->source_name());
if (i != data_sources_.end())
return;
}
data_sources_[source->source_name()] = source;
source->backend_ = weak_factory_.GetWeakPtr();
}
void URLDataManagerBackend::UpdateWebUIDataSource(
const std::string& source_name,
const base::Value::Dict& update) {
auto it = data_sources_.find(source_name);
if (it == data_sources_.end() || !it->second->IsWebUIDataSourceImpl()) {
NOTREACHED_IN_MIGRATION();
return;
}
static_cast<WebUIDataSourceImpl*>(it->second.get())
->AddLocalizedStrings(update);
}
URLDataSourceImpl* URLDataManagerBackend::GetDataSourceFromURL(
const GURL& url) {
// chrome-untrusted:// sources keys are of the form "chrome-untrusted://host".
if (url.scheme() == kChromeUIUntrustedScheme) {
auto i = data_sources_.find(url.DeprecatedGetOriginAsURL().spec());
if (i == data_sources_.end())
return nullptr;
return i->second.get();
}
// The input usually looks like: chrome://source_name/extra_bits?foo
// so do a lookup using the host of the URL.
auto i = data_sources_.find(url.host());
if (i != data_sources_.end())
return i->second.get();
// No match using the host of the URL, so do a lookup using the scheme for
// URLs on the form source_name://extra_bits/foo .
i = data_sources_.find(url.scheme() + "://");
if (i != data_sources_.end())
return i->second.get();
// No matches found, so give up.
return nullptr;
}
scoped_refptr<net::HttpResponseHeaders> URLDataManagerBackend::GetHeaders(
URLDataSourceImpl* source_impl,
const GURL& url,
const std::string& origin) {
// Set the headers so that requests serviced by ChromeURLDataManager return a
// status code of 200. Without this they return a 0, which makes the status
// indistiguishable from other error types. Instant relies on getting a 200.
auto headers =
base::MakeRefCounted<net::HttpResponseHeaders>("HTTP/1.1 200 OK");
if (!source_impl)
return headers;
URLDataSource* source = source_impl->source();
// Determine the least-privileged content security policy header, if any,
// that is compatible with a given WebUI URL, and append it to the existing
// response headers.
if (source->ShouldAddContentSecurityPolicy()) {
std::string csp_header;
const network::mojom::CSPDirectiveName kAllDirectives[] = {
network::mojom::CSPDirectiveName::BaseURI,
network::mojom::CSPDirectiveName::ChildSrc,
network::mojom::CSPDirectiveName::ConnectSrc,
network::mojom::CSPDirectiveName::DefaultSrc,
network::mojom::CSPDirectiveName::FencedFrameSrc,
network::mojom::CSPDirectiveName::FormAction,
network::mojom::CSPDirectiveName::FontSrc,
network::mojom::CSPDirectiveName::FrameSrc,
network::mojom::CSPDirectiveName::ImgSrc,
network::mojom::CSPDirectiveName::MediaSrc,
network::mojom::CSPDirectiveName::ObjectSrc,
network::mojom::CSPDirectiveName::RequireTrustedTypesFor,
network::mojom::CSPDirectiveName::ScriptSrc,
network::mojom::CSPDirectiveName::StyleSrc,
network::mojom::CSPDirectiveName::TrustedTypes,
network::mojom::CSPDirectiveName::WorkerSrc};
for (auto& directive : kAllDirectives) {
csp_header.append(source->GetContentSecurityPolicy(directive));
}
// TODO(crbug.com/40118579): Both CSP frame ancestors and XFO headers may be
// added to the response but frame ancestors would take precedence. In the
// future, XFO will be removed so when that happens remove the check and
// always add frame ancestors.
if (source->ShouldDenyXFrameOptions()) {
csp_header.append(source->GetContentSecurityPolicy(
network::mojom::CSPDirectiveName::FrameAncestors));
}
headers->SetHeader(kChromeURLContentSecurityPolicyHeaderName, csp_header);
}
if (source->ShouldDenyXFrameOptions()) {
headers->SetHeader(kChromeURLXFrameOptionsHeaderName,
kChromeURLXFrameOptionsHeaderValue);
}
if (!source->AllowCaching())
headers->SetHeader("Cache-Control", "no-cache");
std::string mime_type = source->GetMimeType(url);
if (source->ShouldServeMimeTypeAsContentTypeHeader() && !mime_type.empty())
headers->SetHeader(net::HttpRequestHeaders::kContentType, mime_type);
const std::string coop_value = source->GetCrossOriginOpenerPolicy();
if (!coop_value.empty()) {
headers->SetHeader(kChromeURLCrossOriginOpenerPolicyName, coop_value);
}
const std::string coep_value = source->GetCrossOriginEmbedderPolicy();
if (!coep_value.empty()) {
headers->SetHeader(kChromeURLCrossOriginEmbedderPolicyName, coep_value);
}
const std::string corp_value = source->GetCrossOriginResourcePolicy();
if (!corp_value.empty()) {
headers->SetHeader(kChromeURLCrossOriginResourcePolicyName, corp_value);
}
if (!origin.empty()) {
std::string header = source->GetAccessControlAllowOriginForOrigin(origin);
DCHECK(header.empty() || header == origin || header == "*" ||
header == "null");
if (!header.empty()) {
headers->SetHeader("Access-Control-Allow-Origin", header);
headers->SetHeader("Vary", "Origin");
}
}
return headers;
}
bool URLDataManagerBackend::CheckURLIsValid(const GURL& url) {
std::vector<std::string> additional_schemes;
DCHECK(url.SchemeIs(kChromeUIScheme) ||
url.SchemeIs(kChromeUIUntrustedScheme) ||
(GetContentClient()->browser()->GetAdditionalWebUISchemes(
&additional_schemes),
SchemeIsInSchemes(url.scheme(), additional_schemes)));
if (!url.is_valid()) {
NOTREACHED_IN_MIGRATION();
return false;
}
return true;
}
bool URLDataManagerBackend::IsValidNetworkErrorCode(int error_code) {
base::Value::Dict error_codes = net::GetNetConstants();
const base::Value::Dict* net_error_codes_dict =
error_codes.FindDict(kNetworkErrorKey);
if (net_error_codes_dict != nullptr) {
for (auto it = net_error_codes_dict->begin();
it != net_error_codes_dict->end(); ++it) {
if (error_code == it->second.GetInt())
return true;
}
}
return false;
}
std::vector<std::string> URLDataManagerBackend::GetWebUISchemes() {
if (g_disallow_webui_scheme_caching_for_testing) {
return GetWebUISchemesSlow();
}
return GetWebUISchemesCached();
}
void URLDataManagerBackend::SetDisallowWebUISchemeCachingForTesting(
bool disallow_caching) {
g_disallow_webui_scheme_caching_for_testing = disallow_caching;
}
} // namespace content