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gecko-dev/dom/u2f/U2F.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/U2F.h"
#include "mozilla/dom/WebCryptoCommon.h"
#include "mozilla/ipc/PBackgroundChild.h"
#include "mozilla/ipc/BackgroundChild.h"
#include "mozilla/dom/WebAuthnTransactionChild.h"
#include "nsContentUtils.h"
#include "nsICryptoHash.h"
#include "nsIEffectiveTLDService.h"
#include "nsNetCID.h"
#include "nsNetUtil.h"
#include "nsURLParsers.h"
#include "U2FUtil.h"
#include "hasht.h"
using namespace mozilla::ipc;
// Forward decl because of nsHTMLDocument.h's complex dependency on /layout/style
class nsHTMLDocument {
public:
bool IsRegistrableDomainSuffixOfOrEqualTo(const nsAString& aHostSuffixString,
const nsACString& aOrigHost);
};
namespace mozilla {
namespace dom {
static mozilla::LazyLogModule gU2FLog("u2fmanager");
NS_NAMED_LITERAL_STRING(kFinishEnrollment, "navigator.id.finishEnrollment");
NS_NAMED_LITERAL_STRING(kGetAssertion, "navigator.id.getAssertion");
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(U2F)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_ENTRY(nsIDOMEventListener)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(U2F)
NS_IMPL_CYCLE_COLLECTING_RELEASE(U2F)
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(U2F, mParent)
/***********************************************************************
* Utility Functions
**********************************************************************/
static ErrorCode
ConvertNSResultToErrorCode(const nsresult& aError)
{
if (aError == NS_ERROR_DOM_TIMEOUT_ERR) {
return ErrorCode::TIMEOUT;
}
/* Emitted by U2F{Soft,HID}TokenManager when we really mean ineligible */
if (aError == NS_ERROR_DOM_NOT_ALLOWED_ERR) {
return ErrorCode::DEVICE_INELIGIBLE;
}
return ErrorCode::OTHER_ERROR;
}
static uint32_t
AdjustedTimeoutMillis(const Optional<Nullable<int32_t>>& opt_aSeconds)
{
uint32_t adjustedTimeoutMillis = 30000u;
if (opt_aSeconds.WasPassed() && !opt_aSeconds.Value().IsNull()) {
adjustedTimeoutMillis = opt_aSeconds.Value().Value() * 1000u;
adjustedTimeoutMillis = std::max(15000u, adjustedTimeoutMillis);
adjustedTimeoutMillis = std::min(120000u, adjustedTimeoutMillis);
}
return adjustedTimeoutMillis;
}
static nsresult
AssembleClientData(const nsAString& aOrigin, const nsAString& aTyp,
const nsAString& aChallenge,
/* out */ nsString& aClientData)
{
MOZ_ASSERT(NS_IsMainThread());
U2FClientData clientDataObject;
clientDataObject.mTyp.Construct(aTyp); // "Typ" from the U2F specification
clientDataObject.mChallenge.Construct(aChallenge);
clientDataObject.mOrigin.Construct(aOrigin);
if (NS_WARN_IF(!clientDataObject.ToJSON(aClientData))) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
static void
RegisteredKeysToScopedCredentialList(const nsAString& aAppId,
const nsTArray<RegisteredKey>& aKeys,
nsTArray<WebAuthnScopedCredential>& aList)
{
for (const RegisteredKey& key : aKeys) {
// Check for required attributes
if (!key.mVersion.WasPassed() || !key.mKeyHandle.WasPassed() ||
key.mVersion.Value() != kRequiredU2FVersion) {
continue;
}
// If this key's mAppId doesn't match the invocation, we can't handle it.
if (key.mAppId.WasPassed() && !key.mAppId.Value().Equals(aAppId)) {
continue;
}
CryptoBuffer keyHandle;
nsresult rv = keyHandle.FromJwkBase64(key.mKeyHandle.Value());
if (NS_WARN_IF(NS_FAILED(rv))) {
continue;
}
WebAuthnScopedCredential c;
c.id() = keyHandle;
aList.AppendElement(c);
}
}
static ErrorCode
EvaluateAppID(nsPIDOMWindowInner* aParent, const nsString& aOrigin,
/* in/out */ nsString& aAppId)
{
// Facet is the specification's way of referring to the web origin.
nsAutoCString facetString = NS_ConvertUTF16toUTF8(aOrigin);
nsCOMPtr<nsIURI> facetUri;
if (NS_FAILED(NS_NewURI(getter_AddRefs(facetUri), facetString))) {
return ErrorCode::BAD_REQUEST;
}
// If the facetId (origin) is not HTTPS, reject
bool facetIsHttps = false;
if (NS_FAILED(facetUri->SchemeIs("https", &facetIsHttps)) || !facetIsHttps) {
return ErrorCode::BAD_REQUEST;
}
// If the appId is empty or null, overwrite it with the facetId and accept
if (aAppId.IsEmpty() || aAppId.EqualsLiteral("null")) {
aAppId.Assign(aOrigin);
return ErrorCode::OK;
}
// AppID is user-supplied. It's quite possible for this parse to fail.
nsAutoCString appIdString = NS_ConvertUTF16toUTF8(aAppId);
nsCOMPtr<nsIURI> appIdUri;
if (NS_FAILED(NS_NewURI(getter_AddRefs(appIdUri), appIdString))) {
return ErrorCode::BAD_REQUEST;
}
// if the appId URL is not HTTPS, reject.
bool appIdIsHttps = false;
if (NS_FAILED(appIdUri->SchemeIs("https", &appIdIsHttps)) || !appIdIsHttps) {
return ErrorCode::BAD_REQUEST;
}
nsAutoCString appIdHost;
if (NS_FAILED(appIdUri->GetAsciiHost(appIdHost))) {
return ErrorCode::BAD_REQUEST;
}
// Allow localhost.
if (appIdHost.EqualsLiteral("localhost")) {
nsAutoCString facetHost;
if (NS_FAILED(facetUri->GetAsciiHost(facetHost))) {
return ErrorCode::BAD_REQUEST;
}
if (facetHost.EqualsLiteral("localhost")) {
return ErrorCode::OK;
}
}
// Run the HTML5 algorithm to relax the same-origin policy, copied from W3C
// Web Authentication. See Bug 1244959 comment #8 for context on why we are
// doing this instead of implementing the external-fetch FacetID logic.
nsCOMPtr<nsIDocument> document = aParent->GetDoc();
if (!document || !document->IsHTMLDocument()) {
return ErrorCode::BAD_REQUEST;
}
nsHTMLDocument* html = document->AsHTMLDocument();
if (NS_WARN_IF(!html)) {
return ErrorCode::BAD_REQUEST;
}
// Use the base domain as the facet for evaluation. This lets this algorithm
// relax the whole eTLD+1.
nsCOMPtr<nsIEffectiveTLDService> tldService =
do_GetService(NS_EFFECTIVETLDSERVICE_CONTRACTID);
if (!tldService) {
return ErrorCode::BAD_REQUEST;
}
nsAutoCString lowestFacetHost;
if (NS_FAILED(tldService->GetBaseDomain(facetUri, 0, lowestFacetHost))) {
return ErrorCode::BAD_REQUEST;
}
MOZ_LOG(gU2FLog, LogLevel::Debug,
("AppId %s Facet %s", appIdHost.get(), lowestFacetHost.get()));
if (html->IsRegistrableDomainSuffixOfOrEqualTo(NS_ConvertUTF8toUTF16(lowestFacetHost),
appIdHost)) {
return ErrorCode::OK;
}
return ErrorCode::BAD_REQUEST;
}
static nsresult
BuildTransactionHashes(const nsCString& aRpId,
const nsCString& aClientDataJSON,
/* out */ CryptoBuffer& aRpIdHash,
/* out */ CryptoBuffer& aClientDataHash)
{
nsresult srv;
nsCOMPtr<nsICryptoHash> hashService =
do_CreateInstance(NS_CRYPTO_HASH_CONTRACTID, &srv);
if (NS_FAILED(srv)) {
return srv;
}
if (!aRpIdHash.SetLength(SHA256_LENGTH, fallible)) {
return NS_ERROR_OUT_OF_MEMORY;
}
srv = HashCString(hashService, aRpId, aRpIdHash);
if (NS_WARN_IF(NS_FAILED(srv))) {
return NS_ERROR_FAILURE;
}
if (!aClientDataHash.SetLength(SHA256_LENGTH, fallible)) {
return NS_ERROR_OUT_OF_MEMORY;
}
srv = HashCString(hashService, aClientDataJSON, aClientDataHash);
if (NS_WARN_IF(NS_FAILED(srv))) {
return NS_ERROR_FAILURE;
}
if (MOZ_LOG_TEST(gU2FLog, LogLevel::Debug)) {
nsString base64;
Unused << NS_WARN_IF(NS_FAILED(aRpIdHash.ToJwkBase64(base64)));
MOZ_LOG(gU2FLog, LogLevel::Debug,
("dom::U2FManager::RpID: %s", aRpId.get()));
MOZ_LOG(gU2FLog, LogLevel::Debug,
("dom::U2FManager::Rp ID Hash (base64): %s",
NS_ConvertUTF16toUTF8(base64).get()));
Unused << NS_WARN_IF(NS_FAILED(aClientDataHash.ToJwkBase64(base64)));
MOZ_LOG(gU2FLog, LogLevel::Debug,
("dom::U2FManager::Client Data JSON: %s", aClientDataJSON.get()));
MOZ_LOG(gU2FLog, LogLevel::Debug,
("dom::U2FManager::Client Data Hash (base64): %s",
NS_ConvertUTF16toUTF8(base64).get()));
}
return NS_OK;
}
/***********************************************************************
* U2F JavaScript API Implementation
**********************************************************************/
U2F::~U2F()
{
MOZ_ASSERT(NS_IsMainThread());
if (mTransaction.isSome()) {
RejectTransaction(NS_ERROR_ABORT);
}
if (mChild) {
RefPtr<WebAuthnTransactionChild> c;
mChild.swap(c);
c->Disconnect();
}
}
void
U2F::Init(ErrorResult& aRv)
{
MOZ_ASSERT(mParent);
nsCOMPtr<nsIDocument> doc = mParent->GetDoc();
MOZ_ASSERT(doc);
if (!doc) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
nsIPrincipal* principal = doc->NodePrincipal();
aRv = nsContentUtils::GetUTFOrigin(principal, mOrigin);
if (NS_WARN_IF(aRv.Failed())) {
return;
}
if (NS_WARN_IF(mOrigin.IsEmpty())) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
}
/* virtual */ JSObject*
U2F::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return U2FBinding::Wrap(aCx, this, aGivenProto);
}
template<typename T, typename C>
void
U2F::ExecuteCallback(T& aResp, nsMainThreadPtrHandle<C>& aCb)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aCb);
// Assert that mTransaction was cleared before before we were called to allow
// reentrancy from microtask checkpoints.
MOZ_ASSERT(mTransaction.isNothing());
ErrorResult error;
aCb->Call(aResp, error);
NS_WARNING_ASSERTION(!error.Failed(), "dom::U2F::Promise callback failed");
error.SuppressException(); // Useful exceptions already emitted
}
void
U2F::Register(const nsAString& aAppId,
const Sequence<RegisterRequest>& aRegisterRequests,
const Sequence<RegisteredKey>& aRegisteredKeys,
U2FRegisterCallback& aCallback,
const Optional<Nullable<int32_t>>& opt_aTimeoutSeconds,
ErrorResult& aRv)
{
MOZ_ASSERT(NS_IsMainThread());
if (mTransaction.isSome()) {
CancelTransaction(NS_ERROR_ABORT);
}
nsMainThreadPtrHandle<U2FRegisterCallback> callback(
new nsMainThreadPtrHolder<U2FRegisterCallback>("U2F::Register::callback",
&aCallback));
// Ensure we have a callback.
if (NS_WARN_IF(!callback)) {
return;
}
// Evaluate the AppID
nsString adjustedAppId;
adjustedAppId.Assign(aAppId);
ErrorCode appIdResult = EvaluateAppID(mParent, mOrigin, adjustedAppId);
if (appIdResult != ErrorCode::OK) {
RegisterResponse response;
response.mErrorCode.Construct(static_cast<uint32_t>(appIdResult));
ExecuteCallback(response, callback);
return;
}
// Produce the AppParam from the current AppID
nsCString cAppId = NS_ConvertUTF16toUTF8(adjustedAppId);
nsAutoString clientDataJSON;
// Pick the first valid RegisterRequest; we can only work with one.
for (const RegisterRequest& req : aRegisterRequests) {
if (!req.mChallenge.WasPassed() || !req.mVersion.WasPassed() ||
req.mVersion.Value() != kRequiredU2FVersion) {
continue;
}
nsresult rv = AssembleClientData(mOrigin, kFinishEnrollment,
req.mChallenge.Value(), clientDataJSON);
if (NS_WARN_IF(NS_FAILED(rv))) {
continue;
}
}
// Did we not get a valid RegisterRequest? Abort.
if (clientDataJSON.IsEmpty()) {
RegisterResponse response;
response.mErrorCode.Construct(static_cast<uint32_t>(ErrorCode::BAD_REQUEST));
ExecuteCallback(response, callback);
return;
}
// Build the exclusion list, if any
nsTArray<WebAuthnScopedCredential> excludeList;
RegisteredKeysToScopedCredentialList(adjustedAppId, aRegisteredKeys,
excludeList);
auto clientData = NS_ConvertUTF16toUTF8(clientDataJSON);
CryptoBuffer rpIdHash, clientDataHash;
if (NS_FAILED(BuildTransactionHashes(cAppId, clientData,
rpIdHash, clientDataHash))) {
RegisterResponse response;
response.mErrorCode.Construct(static_cast<uint32_t>(ErrorCode::OTHER_ERROR));
ExecuteCallback(response, callback);
return;
}
if (!MaybeCreateBackgroundActor()) {
RegisterResponse response;
response.mErrorCode.Construct(static_cast<uint32_t>(ErrorCode::OTHER_ERROR));
ExecuteCallback(response, callback);
return;
}
ListenForVisibilityEvents();
// Always blank for U2F
nsTArray<WebAuthnExtension> extensions;
// Default values for U2F.
WebAuthnAuthenticatorSelection authSelection(false /* requireResidentKey */,
false /* requireUserVerification */,
false /* requirePlatformAttachment */);
uint32_t adjustedTimeoutMillis = AdjustedTimeoutMillis(opt_aTimeoutSeconds);
WebAuthnMakeCredentialInfo info(rpIdHash,
clientDataHash,
adjustedTimeoutMillis,
excludeList,
extensions,
authSelection);
MOZ_ASSERT(mTransaction.isNothing());
mTransaction = Some(U2FTransaction(clientData, Move(AsVariant(callback))));
mChild->SendRequestRegister(mTransaction.ref().mId, info);
}
void
U2F::FinishMakeCredential(const uint64_t& aTransactionId,
nsTArray<uint8_t>& aRegBuffer)
{
MOZ_ASSERT(NS_IsMainThread());
// Check for a valid transaction.
if (mTransaction.isNothing() || mTransaction.ref().mId != aTransactionId) {
return;
}
if (NS_WARN_IF(!mTransaction.ref().HasRegisterCallback())) {
RejectTransaction(NS_ERROR_ABORT);
return;
}
CryptoBuffer clientDataBuf;
if (NS_WARN_IF(!clientDataBuf.Assign(mTransaction.ref().mClientData))) {
RejectTransaction(NS_ERROR_ABORT);
return;
}
CryptoBuffer regBuf;
if (NS_WARN_IF(!regBuf.Assign(aRegBuffer))) {
RejectTransaction(NS_ERROR_ABORT);
return;
}
nsString clientDataBase64;
nsString registrationDataBase64;
nsresult rvClientData = clientDataBuf.ToJwkBase64(clientDataBase64);
nsresult rvRegistrationData = regBuf.ToJwkBase64(registrationDataBase64);
if (NS_WARN_IF(NS_FAILED(rvClientData)) ||
NS_WARN_IF(NS_FAILED(rvRegistrationData))) {
RejectTransaction(NS_ERROR_ABORT);
return;
}
// Assemble a response object to return
RegisterResponse response;
response.mVersion.Construct(kRequiredU2FVersion);
response.mClientData.Construct(clientDataBase64);
response.mRegistrationData.Construct(registrationDataBase64);
response.mErrorCode.Construct(static_cast<uint32_t>(ErrorCode::OK));
// Keep the callback pointer alive.
nsMainThreadPtrHandle<U2FRegisterCallback> callback(
mTransaction.ref().GetRegisterCallback());
ClearTransaction();
ExecuteCallback(response, callback);
}
void
U2F::Sign(const nsAString& aAppId,
const nsAString& aChallenge,
const Sequence<RegisteredKey>& aRegisteredKeys,
U2FSignCallback& aCallback,
const Optional<Nullable<int32_t>>& opt_aTimeoutSeconds,
ErrorResult& aRv)
{
MOZ_ASSERT(NS_IsMainThread());
if (mTransaction.isSome()) {
CancelTransaction(NS_ERROR_ABORT);
}
nsMainThreadPtrHandle<U2FSignCallback> callback(
new nsMainThreadPtrHolder<U2FSignCallback>("U2F::Sign::callback",
&aCallback));
// Ensure we have a callback.
if (NS_WARN_IF(!callback)) {
return;
}
// Evaluate the AppID
nsString adjustedAppId;
adjustedAppId.Assign(aAppId);
ErrorCode appIdResult = EvaluateAppID(mParent, mOrigin, adjustedAppId);
if (appIdResult != ErrorCode::OK) {
SignResponse response;
response.mErrorCode.Construct(static_cast<uint32_t>(appIdResult));
ExecuteCallback(response, callback);
return;
}
// Produce the AppParam from the current AppID
nsCString cAppId = NS_ConvertUTF16toUTF8(adjustedAppId);
nsAutoString clientDataJSON;
nsresult rv = AssembleClientData(mOrigin, kGetAssertion, aChallenge,
clientDataJSON);
if (NS_WARN_IF(NS_FAILED(rv))) {
SignResponse response;
response.mErrorCode.Construct(static_cast<uint32_t>(ErrorCode::BAD_REQUEST));
ExecuteCallback(response, callback);
return;
}
// Build the key list, if any
nsTArray<WebAuthnScopedCredential> permittedList;
RegisteredKeysToScopedCredentialList(adjustedAppId, aRegisteredKeys,
permittedList);
auto clientData = NS_ConvertUTF16toUTF8(clientDataJSON);
CryptoBuffer rpIdHash, clientDataHash;
if (NS_FAILED(BuildTransactionHashes(cAppId, clientData,
rpIdHash, clientDataHash))) {
SignResponse response;
response.mErrorCode.Construct(static_cast<uint32_t>(ErrorCode::OTHER_ERROR));
ExecuteCallback(response, callback);
return;
}
if (!MaybeCreateBackgroundActor()) {
SignResponse response;
response.mErrorCode.Construct(static_cast<uint32_t>(ErrorCode::OTHER_ERROR));
ExecuteCallback(response, callback);
return;
}
ListenForVisibilityEvents();
// Always blank for U2F
nsTArray<WebAuthnExtension> extensions;
uint32_t adjustedTimeoutMillis = AdjustedTimeoutMillis(opt_aTimeoutSeconds);
WebAuthnGetAssertionInfo info(rpIdHash,
clientDataHash,
adjustedTimeoutMillis,
permittedList,
false, /* requireUserVerification */
extensions);
MOZ_ASSERT(mTransaction.isNothing());
mTransaction = Some(U2FTransaction(clientData, Move(AsVariant(callback))));
mChild->SendRequestSign(mTransaction.ref().mId, info);
}
void
U2F::FinishGetAssertion(const uint64_t& aTransactionId,
nsTArray<uint8_t>& aCredentialId,
nsTArray<uint8_t>& aSigBuffer)
{
MOZ_ASSERT(NS_IsMainThread());
// Check for a valid transaction.
if (mTransaction.isNothing() || mTransaction.ref().mId != aTransactionId) {
return;
}
if (NS_WARN_IF(!mTransaction.ref().HasSignCallback())) {
RejectTransaction(NS_ERROR_ABORT);
return;
}
CryptoBuffer clientDataBuf;
if (NS_WARN_IF(!clientDataBuf.Assign(mTransaction.ref().mClientData))) {
RejectTransaction(NS_ERROR_ABORT);
return;
}
CryptoBuffer credBuf;
if (NS_WARN_IF(!credBuf.Assign(aCredentialId))) {
RejectTransaction(NS_ERROR_ABORT);
return;
}
CryptoBuffer sigBuf;
if (NS_WARN_IF(!sigBuf.Assign(aSigBuffer))) {
RejectTransaction(NS_ERROR_ABORT);
return;
}
// Assemble a response object to return
nsString clientDataBase64;
nsString signatureDataBase64;
nsString keyHandleBase64;
nsresult rvClientData = clientDataBuf.ToJwkBase64(clientDataBase64);
nsresult rvSignatureData = sigBuf.ToJwkBase64(signatureDataBase64);
nsresult rvKeyHandle = credBuf.ToJwkBase64(keyHandleBase64);
if (NS_WARN_IF(NS_FAILED(rvClientData)) ||
NS_WARN_IF(NS_FAILED(rvSignatureData) ||
NS_WARN_IF(NS_FAILED(rvKeyHandle)))) {
RejectTransaction(NS_ERROR_ABORT);
return;
}
SignResponse response;
response.mKeyHandle.Construct(keyHandleBase64);
response.mClientData.Construct(clientDataBase64);
response.mSignatureData.Construct(signatureDataBase64);
response.mErrorCode.Construct(static_cast<uint32_t>(ErrorCode::OK));
// Keep the callback pointer alive.
nsMainThreadPtrHandle<U2FSignCallback> callback(
mTransaction.ref().GetSignCallback());
ClearTransaction();
ExecuteCallback(response, callback);
}
void
U2F::ClearTransaction()
{
if (!NS_WARN_IF(mTransaction.isNothing())) {
StopListeningForVisibilityEvents();
}
mTransaction.reset();
}
void
U2F::RejectTransaction(const nsresult& aError)
{
if (NS_WARN_IF(mTransaction.isNothing())) {
return;
}
StopListeningForVisibilityEvents();
// Clear out mTransaction before calling ExecuteCallback() below to allow
// reentrancy from microtask checkpoints.
Maybe<U2FTransaction> maybeTransaction(Move(mTransaction));
MOZ_ASSERT(mTransaction.isNothing() && maybeTransaction.isSome());
U2FTransaction& transaction = maybeTransaction.ref();
ErrorCode code = ConvertNSResultToErrorCode(aError);
if (transaction.HasRegisterCallback()) {
RegisterResponse response;
response.mErrorCode.Construct(static_cast<uint32_t>(code));
ExecuteCallback(response, transaction.GetRegisterCallback());
}
if (transaction.HasSignCallback()) {
SignResponse response;
response.mErrorCode.Construct(static_cast<uint32_t>(code));
ExecuteCallback(response, transaction.GetSignCallback());
}
}
void
U2F::CancelTransaction(const nsresult& aError)
{
if (!NS_WARN_IF(!mChild || mTransaction.isNothing())) {
mChild->SendRequestCancel(mTransaction.ref().mId);
}
RejectTransaction(aError);
}
void
U2F::RequestAborted(const uint64_t& aTransactionId, const nsresult& aError)
{
MOZ_ASSERT(NS_IsMainThread());
if (mTransaction.isSome() && mTransaction.ref().mId == aTransactionId) {
RejectTransaction(aError);
}
}
} // namespace dom
} // namespace mozilla
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