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gecko-dev/dom/webauthn/U2FTokenManager.cpp

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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/U2FTokenManager.h"
#include "mozilla/dom/U2FTokenTransport.h"
#include "mozilla/dom/U2FHIDTokenManager.h"
#include "mozilla/dom/U2FSoftTokenManager.h"
#include "mozilla/dom/PWebAuthnTransactionParent.h"
#include "mozilla/MozPromise.h"
#include "mozilla/dom/WebAuthnUtil.h"
#include "mozilla/ipc/BackgroundParent.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/Unused.h"
#include "nsTextFormatter.h"
// Not named "security.webauth.u2f_softtoken_counter" because setting that
// name causes the window.u2f object to disappear until preferences get
// reloaded, as its pref is a substring!
#define PREF_U2F_NSSTOKEN_COUNTER "security.webauth.softtoken_counter"
#define PREF_WEBAUTHN_SOFTTOKEN_ENABLED "security.webauth.webauthn_enable_softtoken"
#define PREF_WEBAUTHN_USBTOKEN_ENABLED "security.webauth.webauthn_enable_usbtoken"
#define PREF_WEBAUTHN_ALLOW_DIRECT_ATTESTATION "security.webauth.webauthn_testing_allow_direct_attestation"
namespace mozilla {
namespace dom {
/***********************************************************************
* Statics
**********************************************************************/
class U2FPrefManager;
namespace {
static mozilla::LazyLogModule gU2FTokenManagerLog("u2fkeymanager");
StaticRefPtr<U2FTokenManager> gU2FTokenManager;
StaticRefPtr<U2FPrefManager> gPrefManager;
static nsIThread* gBackgroundThread;
}
// Data for WebAuthn UI prompt notifications.
static const char16_t kRegisterPromptNotifcation[] =
u"{\"action\":\"register\",\"tid\":%llu,\"origin\":\"%s\"}";
static const char16_t kRegisterDirectPromptNotifcation[] =
u"{\"action\":\"register-direct\",\"tid\":%llu,\"origin\":\"%s\"}";
static const char16_t kSignPromptNotifcation[] =
u"{\"action\":\"sign\",\"tid\":%llu,\"origin\":\"%s\"}";
static const char16_t kCancelPromptNotifcation[] =
u"{\"action\":\"cancel\",\"tid\":%llu}";
class U2FPrefManager final : public nsIObserver
{
private:
U2FPrefManager() :
mPrefMutex("U2FPrefManager Mutex")
{
UpdateValues();
}
~U2FPrefManager() = default;
public:
NS_DECL_ISUPPORTS
static U2FPrefManager* GetOrCreate()
{
MOZ_ASSERT(NS_IsMainThread());
if (!gPrefManager) {
gPrefManager = new U2FPrefManager();
Preferences::AddStrongObserver(gPrefManager, PREF_WEBAUTHN_SOFTTOKEN_ENABLED);
Preferences::AddStrongObserver(gPrefManager, PREF_U2F_NSSTOKEN_COUNTER);
Preferences::AddStrongObserver(gPrefManager, PREF_WEBAUTHN_USBTOKEN_ENABLED);
Preferences::AddStrongObserver(gPrefManager, PREF_WEBAUTHN_ALLOW_DIRECT_ATTESTATION);
ClearOnShutdown(&gPrefManager, ShutdownPhase::ShutdownThreads);
}
return gPrefManager;
}
static U2FPrefManager* Get()
{
return gPrefManager;
}
bool GetSoftTokenEnabled()
{
MutexAutoLock lock(mPrefMutex);
return mSoftTokenEnabled;
}
int GetSoftTokenCounter()
{
MutexAutoLock lock(mPrefMutex);
return mSoftTokenCounter;
}
bool GetUsbTokenEnabled()
{
MutexAutoLock lock(mPrefMutex);
return mUsbTokenEnabled;
}
bool GetAllowDirectAttestationForTesting()
{
MutexAutoLock lock(mPrefMutex);
return mAllowDirectAttestation;
}
NS_IMETHODIMP
Observe(nsISupports* aSubject,
const char* aTopic,
const char16_t* aData) override
{
UpdateValues();
return NS_OK;
}
private:
void UpdateValues() {
MOZ_ASSERT(NS_IsMainThread());
MutexAutoLock lock(mPrefMutex);
mSoftTokenEnabled = Preferences::GetBool(PREF_WEBAUTHN_SOFTTOKEN_ENABLED);
mSoftTokenCounter = Preferences::GetUint(PREF_U2F_NSSTOKEN_COUNTER);
mUsbTokenEnabled = Preferences::GetBool(PREF_WEBAUTHN_USBTOKEN_ENABLED);
mAllowDirectAttestation = Preferences::GetBool(PREF_WEBAUTHN_ALLOW_DIRECT_ATTESTATION);
}
Mutex mPrefMutex;
bool mSoftTokenEnabled;
int mSoftTokenCounter;
bool mUsbTokenEnabled;
bool mAllowDirectAttestation;
};
NS_IMPL_ISUPPORTS(U2FPrefManager, nsIObserver);
/***********************************************************************
* U2FManager Implementation
**********************************************************************/
NS_IMPL_ISUPPORTS(U2FTokenManager, nsIU2FTokenManager);
U2FTokenManager::U2FTokenManager()
: mTransactionParent(nullptr)
, mLastTransactionId(0)
{
MOZ_ASSERT(XRE_IsParentProcess());
// Create on the main thread to make sure ClearOnShutdown() works.
MOZ_ASSERT(NS_IsMainThread());
// Create the preference manager while we're initializing.
U2FPrefManager::GetOrCreate();
}
//static
void
U2FTokenManager::Initialize()
{
if (!XRE_IsParentProcess()) {
return;
}
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(!gU2FTokenManager);
gU2FTokenManager = new U2FTokenManager();
ClearOnShutdown(&gU2FTokenManager);
}
//static
U2FTokenManager*
U2FTokenManager::Get()
{
MOZ_ASSERT(XRE_IsParentProcess());
// We should only be accessing this on the background thread
MOZ_ASSERT(!NS_IsMainThread());
return gU2FTokenManager;
}
void
U2FTokenManager::AbortTransaction(const uint64_t& aTransactionId,
const nsresult& aError)
{
Unused << mTransactionParent->SendAbort(aTransactionId, aError);
ClearTransaction();
}
void
U2FTokenManager::MaybeClearTransaction(PWebAuthnTransactionParent* aParent)
{
// Only clear if we've been requested to do so by our current transaction
// parent.
if (mTransactionParent == aParent) {
ClearTransaction();
}
}
void
U2FTokenManager::ClearTransaction()
{
if (mLastTransactionId > 0) {
// Remove any prompts we might be showing for the current transaction.
SendPromptNotification(kCancelPromptNotifcation, mLastTransactionId);
}
mTransactionParent = nullptr;
// Drop managers at the end of all transactions
if (mTokenManagerImpl) {
mTokenManagerImpl->Drop();
mTokenManagerImpl = nullptr;
}
// Forget promises, if necessary.
mRegisterPromise.DisconnectIfExists();
mSignPromise.DisconnectIfExists();
// Clear transaction id.
mLastTransactionId = 0;
// Forget any pending registration.
mPendingRegisterInfo.reset();
}
template<typename ...T> void
U2FTokenManager::SendPromptNotification(const char16_t* aFormat, T... aArgs)
{
mozilla::ipc::AssertIsOnBackgroundThread();
nsAutoString json;
nsTextFormatter::ssprintf(json, aFormat, aArgs...);
nsCOMPtr<nsIRunnable> r(NewRunnableMethod<nsString>(
"U2FTokenManager::RunSendPromptNotification", this,
&U2FTokenManager::RunSendPromptNotification, json));
MOZ_ALWAYS_SUCCEEDS(
GetMainThreadEventTarget()->Dispatch(r.forget(), NS_DISPATCH_NORMAL));
}
void
U2FTokenManager::RunSendPromptNotification(nsString aJSON)
{
MOZ_ASSERT(NS_IsMainThread());
nsCOMPtr<nsIObserverService> os = services::GetObserverService();
if (NS_WARN_IF(!os)) {
return;
}
nsCOMPtr<nsIU2FTokenManager> self = do_QueryInterface(this);
MOZ_ALWAYS_SUCCEEDS(os->NotifyObservers(self, "webauthn-prompt", aJSON.get()));
}
RefPtr<U2FTokenTransport>
U2FTokenManager::GetTokenManagerImpl()
{
MOZ_ASSERT(U2FPrefManager::Get());
mozilla::ipc::AssertIsOnBackgroundThread();
if (mTokenManagerImpl) {
return mTokenManagerImpl;
}
if (!gBackgroundThread) {
gBackgroundThread = NS_GetCurrentThread();
MOZ_ASSERT(gBackgroundThread, "This should never be null!");
}
auto pm = U2FPrefManager::Get();
// Prefer the HW token, even if the softtoken is enabled too.
// We currently don't support soft and USB tokens enabled at the
// same time as the softtoken would always win the race to register.
// We could support it for signing though...
if (pm->GetUsbTokenEnabled()) {
return new U2FHIDTokenManager();
}
if (pm->GetSoftTokenEnabled()) {
return new U2FSoftTokenManager(pm->GetSoftTokenCounter());
}
// TODO Use WebAuthnRequest to aggregate results from all transports,
// once we have multiple HW transport types.
return nullptr;
}
void
U2FTokenManager::Register(PWebAuthnTransactionParent* aTransactionParent,
const uint64_t& aTransactionId,
const WebAuthnMakeCredentialInfo& aTransactionInfo)
{
MOZ_LOG(gU2FTokenManagerLog, LogLevel::Debug, ("U2FAuthRegister"));
ClearTransaction();
mTransactionParent = aTransactionParent;
mTokenManagerImpl = GetTokenManagerImpl();
if (!mTokenManagerImpl) {
AbortTransaction(aTransactionId, NS_ERROR_DOM_NOT_ALLOWED_ERR);
return;
}
mLastTransactionId = aTransactionId;
// Determine whether direct attestation was requested.
bool directAttestationRequested = false;
if (aTransactionInfo.Extra().type() == WebAuthnMaybeMakeCredentialExtraInfo::TWebAuthnMakeCredentialExtraInfo) {
const auto& extra = aTransactionInfo.Extra().get_WebAuthnMakeCredentialExtraInfo();
directAttestationRequested = extra.RequestDirectAttestation();
}
// Start a register request immediately if direct attestation
// wasn't requested or the test pref is set.
if (!directAttestationRequested ||
U2FPrefManager::Get()->GetAllowDirectAttestationForTesting()) {
// Force "none" attestation when "direct" attestation wasn't requested.
DoRegister(aTransactionInfo, !directAttestationRequested);
return;
}
// If the RP request direct attestation, ask the user for permission and
// store the transaction info until the user proceeds or cancels.
NS_ConvertUTF16toUTF8 origin(aTransactionInfo.Origin());
SendPromptNotification(kRegisterDirectPromptNotifcation,
aTransactionId,
origin.get());
MOZ_ASSERT(mPendingRegisterInfo.isNothing());
mPendingRegisterInfo = Some(aTransactionInfo);
}
void
U2FTokenManager::DoRegister(const WebAuthnMakeCredentialInfo& aInfo,
bool aForceNoneAttestation)
{
mozilla::ipc::AssertIsOnBackgroundThread();
MOZ_ASSERT(mLastTransactionId > 0);
// Show a prompt that lets the user cancel the ongoing transaction.
NS_ConvertUTF16toUTF8 origin(aInfo.Origin());
SendPromptNotification(kRegisterPromptNotifcation,
mLastTransactionId,
origin.get());
uint64_t tid = mLastTransactionId;
mozilla::TimeStamp startTime = mozilla::TimeStamp::Now();
mTokenManagerImpl
->Register(aInfo, aForceNoneAttestation)
->Then(GetCurrentThreadSerialEventTarget(), __func__,
[tid, startTime](WebAuthnMakeCredentialResult&& aResult) {
U2FTokenManager* mgr = U2FTokenManager::Get();
mgr->MaybeConfirmRegister(tid, aResult);
Telemetry::ScalarAdd(
Telemetry::ScalarID::SECURITY_WEBAUTHN_USED,
NS_LITERAL_STRING("U2FRegisterFinish"), 1);
Telemetry::AccumulateTimeDelta(
Telemetry::WEBAUTHN_CREATE_CREDENTIAL_MS,
startTime);
},
[tid](nsresult rv) {
MOZ_ASSERT(NS_FAILED(rv));
U2FTokenManager* mgr = U2FTokenManager::Get();
mgr->MaybeAbortRegister(tid, rv);
Telemetry::ScalarAdd(
Telemetry::ScalarID::SECURITY_WEBAUTHN_USED,
NS_LITERAL_STRING("U2FRegisterAbort"), 1);
})
->Track(mRegisterPromise);
}
void
U2FTokenManager::MaybeConfirmRegister(const uint64_t& aTransactionId,
const WebAuthnMakeCredentialResult& aResult)
{
MOZ_ASSERT(mLastTransactionId == aTransactionId);
mRegisterPromise.Complete();
Unused << mTransactionParent->SendConfirmRegister(aTransactionId, aResult);
ClearTransaction();
}
void
U2FTokenManager::MaybeAbortRegister(const uint64_t& aTransactionId,
const nsresult& aError)
{
MOZ_ASSERT(mLastTransactionId == aTransactionId);
mRegisterPromise.Complete();
AbortTransaction(aTransactionId, aError);
}
void
U2FTokenManager::Sign(PWebAuthnTransactionParent* aTransactionParent,
const uint64_t& aTransactionId,
const WebAuthnGetAssertionInfo& aTransactionInfo)
{
MOZ_LOG(gU2FTokenManagerLog, LogLevel::Debug, ("U2FAuthSign"));
ClearTransaction();
mTransactionParent = aTransactionParent;
mTokenManagerImpl = GetTokenManagerImpl();
if (!mTokenManagerImpl) {
AbortTransaction(aTransactionId, NS_ERROR_DOM_NOT_ALLOWED_ERR);
return;
}
// Show a prompt that lets the user cancel the ongoing transaction.
NS_ConvertUTF16toUTF8 origin(aTransactionInfo.Origin());
SendPromptNotification(kSignPromptNotifcation,
aTransactionId,
origin.get());
uint64_t tid = mLastTransactionId = aTransactionId;
mozilla::TimeStamp startTime = mozilla::TimeStamp::Now();
mTokenManagerImpl
->Sign(aTransactionInfo)
->Then(GetCurrentThreadSerialEventTarget(), __func__,
[tid, startTime](WebAuthnGetAssertionResult&& aResult) {
U2FTokenManager* mgr = U2FTokenManager::Get();
mgr->MaybeConfirmSign(tid, aResult);
Telemetry::ScalarAdd(
Telemetry::ScalarID::SECURITY_WEBAUTHN_USED,
NS_LITERAL_STRING("U2FSignFinish"), 1);
Telemetry::AccumulateTimeDelta(
Telemetry::WEBAUTHN_GET_ASSERTION_MS,
startTime);
},
[tid](nsresult rv) {
MOZ_ASSERT(NS_FAILED(rv));
U2FTokenManager* mgr = U2FTokenManager::Get();
mgr->MaybeAbortSign(tid, rv);
Telemetry::ScalarAdd(
Telemetry::ScalarID::SECURITY_WEBAUTHN_USED,
NS_LITERAL_STRING("U2FSignAbort"), 1);
})
->Track(mSignPromise);
}
void
U2FTokenManager::MaybeConfirmSign(const uint64_t& aTransactionId,
const WebAuthnGetAssertionResult& aResult)
{
MOZ_ASSERT(mLastTransactionId == aTransactionId);
mSignPromise.Complete();
Unused << mTransactionParent->SendConfirmSign(aTransactionId, aResult);
ClearTransaction();
}
void
U2FTokenManager::MaybeAbortSign(const uint64_t& aTransactionId,
const nsresult& aError)
{
MOZ_ASSERT(mLastTransactionId == aTransactionId);
mSignPromise.Complete();
AbortTransaction(aTransactionId, aError);
}
void
U2FTokenManager::Cancel(PWebAuthnTransactionParent* aParent,
const uint64_t& aTransactionId)
{
if (mTransactionParent != aParent || mLastTransactionId != aTransactionId) {
return;
}
mTokenManagerImpl->Cancel();
ClearTransaction();
}
// nsIU2FTokenManager
NS_IMETHODIMP
U2FTokenManager::ResumeRegister(uint64_t aTransactionId,
bool aForceNoneAttestation)
{
MOZ_ASSERT(XRE_IsParentProcess());
MOZ_ASSERT(NS_IsMainThread());
if (!gBackgroundThread) {
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIRunnable> r(NewRunnableMethod<uint64_t, bool>(
"U2FTokenManager::RunResumeRegister", this,
&U2FTokenManager::RunResumeRegister, aTransactionId,
aForceNoneAttestation));
return gBackgroundThread->Dispatch(r.forget(), NS_DISPATCH_NORMAL);
}
void
U2FTokenManager::RunResumeRegister(uint64_t aTransactionId,
bool aForceNoneAttestation)
{
mozilla::ipc::AssertIsOnBackgroundThread();
if (NS_WARN_IF(mPendingRegisterInfo.isNothing())) {
return;
}
if (mLastTransactionId != aTransactionId) {
return;
}
// Resume registration and cleanup.
DoRegister(mPendingRegisterInfo.ref(), aForceNoneAttestation);
mPendingRegisterInfo.reset();
}
NS_IMETHODIMP
U2FTokenManager::Cancel(uint64_t aTransactionId)
{
MOZ_ASSERT(XRE_IsParentProcess());
MOZ_ASSERT(NS_IsMainThread());
if (!gBackgroundThread) {
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIRunnable> r(NewRunnableMethod<uint64_t>(
"U2FTokenManager::RunCancel", this,
&U2FTokenManager::RunCancel, aTransactionId));
return gBackgroundThread->Dispatch(r.forget(), NS_DISPATCH_NORMAL);
}
void
U2FTokenManager::RunCancel(uint64_t aTransactionId)
{
mozilla::ipc::AssertIsOnBackgroundThread();
if (mLastTransactionId != aTransactionId) {
return;
}
// Cancel the request.
mTokenManagerImpl->Cancel();
// Reject the promise.
AbortTransaction(aTransactionId, NS_ERROR_DOM_ABORT_ERR);
}
}
}
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