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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/cache/PrincipalVerifier.h"
#include "ErrorList.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/cache/ManagerId.h"
#include "mozilla/ipc/BackgroundParent.h"
#include "mozilla/ipc/PBackgroundParent.h"
#include "mozilla/ipc/BackgroundUtils.h"
#include "mozilla/BasePrincipal.h"
#include "CacheCommon.h"
#include "nsCOMPtr.h"
#include "nsContentUtils.h"
#include "nsIPrincipal.h"
#include "nsNetUtil.h"
namespace mozilla::dom::cache {
using mozilla::ipc::AssertIsOnBackgroundThread;
using mozilla::ipc::BackgroundParent;
using mozilla::ipc::PBackgroundParent;
using mozilla::ipc::PrincipalInfo;
using mozilla::ipc::PrincipalInfoToPrincipal;
// static
already_AddRefed<PrincipalVerifier> PrincipalVerifier::CreateAndDispatch(
Listener& aListener, PBackgroundParent* aActor,
const PrincipalInfo& aPrincipalInfo) {
// We must get the ContentParent actor from the PBackgroundParent. This
// only works on the PBackground thread.
AssertIsOnBackgroundThread();
RefPtr<PrincipalVerifier> verifier =
new PrincipalVerifier(aListener, aActor, aPrincipalInfo);
MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(verifier));
return verifier.forget();
}
void PrincipalVerifier::AddListener(Listener& aListener) {
AssertIsOnBackgroundThread();
MOZ_ASSERT(!mListenerList.Contains(&aListener));
mListenerList.AppendElement(WrapNotNullUnchecked(&aListener));
}
void PrincipalVerifier::RemoveListener(Listener& aListener) {
AssertIsOnBackgroundThread();
MOZ_ALWAYS_TRUE(mListenerList.RemoveElement(&aListener));
}
PrincipalVerifier::PrincipalVerifier(Listener& aListener,
PBackgroundParent* aActor,
const PrincipalInfo& aPrincipalInfo)
: Runnable("dom::cache::PrincipalVerifier"),
mActor(BackgroundParent::GetContentParent(aActor)),
mPrincipalInfo(aPrincipalInfo),
mInitiatingEventTarget(GetCurrentSerialEventTarget()),
mResult(NS_OK) {
AssertIsOnBackgroundThread();
MOZ_DIAGNOSTIC_ASSERT(mInitiatingEventTarget);
AddListener(aListener);
}
PrincipalVerifier::~PrincipalVerifier() {
// Since the PrincipalVerifier is a Runnable that executes on multiple
// threads, its a race to see which thread de-refs us last. Therefore
// we cannot guarantee which thread we destruct on.
MOZ_DIAGNOSTIC_ASSERT(mListenerList.IsEmpty());
// We should always be able to explicitly release the actor on the main
// thread.
MOZ_DIAGNOSTIC_ASSERT(!mActor);
}
NS_IMETHODIMP
PrincipalVerifier::Run() {
// Executed twice. First, on the main thread and then back on the
// originating thread.
if (NS_IsMainThread()) {
VerifyOnMainThread();
return NS_OK;
}
CompleteOnInitiatingThread();
return NS_OK;
}
void PrincipalVerifier::VerifyOnMainThread() {
MOZ_ASSERT(NS_IsMainThread());
// No matter what happens, we need to release the actor before leaving
// this method.
RefPtr<ContentParent> actor = std::move(mActor);
CACHE_TRY_INSPECT(
const auto& principal, PrincipalInfoToPrincipal(mPrincipalInfo), QM_VOID,
[this](const nsresult result) { DispatchToInitiatingThread(result); });
// We disallow null principal on the client side, but double-check here.
if (NS_WARN_IF(principal->GetIsNullPrincipal())) {
DispatchToInitiatingThread(NS_ERROR_FAILURE);
return;
}
// Verify if a child process uses system principal, which is not allowed
// to prevent system principal is spoofed.
if (NS_WARN_IF(actor && principal->IsSystemPrincipal())) {
DispatchToInitiatingThread(NS_ERROR_FAILURE);
return;
}
actor = nullptr;
#ifdef DEBUG
nsresult rv = NS_OK;
// Sanity check principal origin by using it to construct a URI and security
// checking it. Don't do this for the system principal, though, as its origin
// is a synthetic [System Principal] string.
if (!principal->IsSystemPrincipal()) {
nsAutoCString origin;
rv = principal->GetOriginNoSuffix(origin);
if (NS_WARN_IF(NS_FAILED(rv))) {
DispatchToInitiatingThread(rv);
return;
}
nsCOMPtr<nsIURI> uri;
rv = NS_NewURI(getter_AddRefs(uri), origin);
if (NS_WARN_IF(NS_FAILED(rv))) {
DispatchToInitiatingThread(rv);
return;
}
rv = principal->CheckMayLoad(uri, false);
if (NS_WARN_IF(NS_FAILED(rv))) {
DispatchToInitiatingThread(rv);
return;
}
}
#endif
auto managerIdOrErr = ManagerId::Create(principal);
if (NS_WARN_IF(managerIdOrErr.isErr())) {
DispatchToInitiatingThread(managerIdOrErr.unwrapErr());
return;
}
mManagerId = managerIdOrErr.unwrap();
DispatchToInitiatingThread(NS_OK);
}
void PrincipalVerifier::CompleteOnInitiatingThread() {
AssertIsOnBackgroundThread();
for (const auto& listener : mListenerList.ForwardRange()) {
listener->OnPrincipalVerified(mResult, mManagerId);
}
// The listener must clear its reference in OnPrincipalVerified()
MOZ_DIAGNOSTIC_ASSERT(mListenerList.IsEmpty());
}
void PrincipalVerifier::DispatchToInitiatingThread(nsresult aRv) {
MOZ_ASSERT(NS_IsMainThread());
mResult = aRv;
// The Cache ShutdownObserver does not track all principal verifiers, so we
// cannot ensure this always succeeds. Instead, simply warn on failures.
// This will result in a new CacheStorage object delaying operations until
// shutdown completes and the browser goes away. This is as graceful as
// we can get here.
nsresult rv =
mInitiatingEventTarget->Dispatch(this, nsIThread::DISPATCH_NORMAL);
if (NS_FAILED(rv)) {
NS_WARNING(
"Cache unable to complete principal verification due to shutdown.");
}
}
} // namespace mozilla::dom::cache
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