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// Copyright 2024 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/web_package/subresource_signed_exchange_url_loader_factory.h"
#include <stdint.h>
#include <memory>
#include <utility>
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/notreached.h"
#include "base/time/time.h"
#include "content/browser/web_package/signed_exchange_inner_response_url_loader.h"
#include "mojo/public/cpp/bindings/message.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "mojo/public/cpp/bindings/self_owned_receiver.h"
#include "net/base/net_errors.h"
#include "services/network/public/cpp/initiator_lock_compatibility.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/mojom/url_loader.mojom.h"
#include "storage/browser/blob/blob_data_handle.h"
namespace content {
namespace {
bool IsValidRequestInitiator(const network::ResourceRequest& request,
const url::Origin& request_initiator_origin_lock) {
// TODO(lukasza): Deduplicate the check below by reusing parts of
// CorsURLLoaderFactory::IsValidRequest (potentially also reusing the parts
// that validate non-initiator-related parts of a ResourceRequest).
network::InitiatorLockCompatibility initiator_lock_compatibility =
network::VerifyRequestInitiatorLock(request_initiator_origin_lock,
request.request_initiator);
switch (initiator_lock_compatibility) {
case network::InitiatorLockCompatibility::kBrowserProcess:
// kBrowserProcess cannot happen outside of NetworkService.
NOTREACHED();
case network::InitiatorLockCompatibility::kNoLock:
case network::InitiatorLockCompatibility::kNoInitiator:
// Only browser-initiated navigations can specify no initiator and we only
// expect subresource requests (i.e. non-navigations) to go through
// SubresourceSignedExchangeURLLoaderFactory::CreateLoaderAndStart.
NOTREACHED();
case network::InitiatorLockCompatibility::kCompatibleLock:
return true;
case network::InitiatorLockCompatibility::kIncorrectLock:
// This branch indicates that either 1) the CreateLoaderAndStart IPC was
// forged by a malicious/compromised renderer process or 2) there are
// renderer-side bugs.
NOTREACHED();
}
// Failing safely for an unrecognied `network::InitiatorLockCompatibility`
// enum value.
NOTREACHED();
}
} // namespace
SubresourceSignedExchangeURLLoaderFactory::
SubresourceSignedExchangeURLLoaderFactory(
mojo::PendingReceiver<network::mojom::URLLoaderFactory> receiver,
std::unique_ptr<const PrefetchedSignedExchangeCacheEntry> entry,
const url::Origin& request_initiator_origin_lock)
: entry_(std::move(entry)),
request_initiator_origin_lock_(request_initiator_origin_lock) {
receivers_.Add(this, std::move(receiver));
receivers_.set_disconnect_handler(base::BindRepeating(
&SubresourceSignedExchangeURLLoaderFactory::OnMojoDisconnect,
base::Unretained(this)));
}
SubresourceSignedExchangeURLLoaderFactory::
~SubresourceSignedExchangeURLLoaderFactory() = default;
void SubresourceSignedExchangeURLLoaderFactory::CreateLoaderAndStart(
mojo::PendingReceiver<network::mojom::URLLoader> loader,
int32_t request_id,
uint32_t options,
const network::ResourceRequest& request,
mojo::PendingRemote<network::mojom::URLLoaderClient> client,
const net::MutableNetworkTrafficAnnotationTag& traffic_annotation) {
if (!IsValidRequestInitiator(request, request_initiator_origin_lock_)) {
network::debug::ScopedResourceRequestCrashKeys request_crash_keys(request);
network::debug::ScopedRequestInitiatorOriginLockCrashKey lock_crash_keys(
request_initiator_origin_lock_);
mojo::ReportBadMessage(
"SubresourceSignedExchangeURLLoaderFactory: "
"lock VS initiator mismatch");
mojo::Remote<network::mojom::URLLoaderClient>(std::move(client))
->OnComplete(
network::URLLoaderCompletionStatus(net::ERR_INVALID_ARGUMENT));
NOTREACHED();
}
DCHECK_EQ(request.url, entry_->inner_url());
mojo::MakeSelfOwnedReceiver(
std::make_unique<SignedExchangeInnerResponseURLLoader>(
request, entry_->inner_response().Clone(),
std::make_unique<const storage::BlobDataHandle>(
*entry_->blob_data_handle()),
*entry_->completion_status(), std::move(client),
false /* is_navigation_request */, orb_state_),
std::move(loader));
}
void SubresourceSignedExchangeURLLoaderFactory::Clone(
mojo::PendingReceiver<network::mojom::URLLoaderFactory> receiver) {
receivers_.Add(this, std::move(receiver));
}
void SubresourceSignedExchangeURLLoaderFactory::OnMojoDisconnect() {
if (!receivers_.empty()) {
return;
}
delete this;
}
} // namespace content
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