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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* 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
// Implements the client authentication certificate selection callback for NSS.
// nsNSSIOLayer.cpp sets the callback by calling SSL_GetClientAuthDataHook and
// identifying SSLGetClientAuthDataHook as the function to call when a TLS
// server requests a client authentication certificate.
//
// In the general case, SSLGetClientAuthDataHook (running on the socket thread),
// dispatches an event to the main thread to ask the user to select a client
// authentication certificate. Meanwhile, it returns SECWouldBlock so that other
// network I/O can occur. When the user selects a client certificate (or opts
// not to send one), an event is dispatched to the socket thread that gives NSS
// the appropriate information to proceed with the TLS connection.
//
// If networking is being done on the socket process, SSLGetClientAuthDataHook
// sends an IPC call to the parent process to ask the user to select a
// certificate. Meanwhile, it again returns SECWouldBlock so other network I/O
// can occur. When a certificate (or no certificate) has been selected, the
// parent process sends an IPC call back to the socket process, which causes an
// event to be dispatched to the socket thread to continue to the TLS
// connection.
#include "TLSClientAuthCertSelection.h"
#include "cert_storage/src/cert_storage.h"
#include "mozilla/Logging.h"
#include "mozilla/dom/BrowsingContext.h"
#include "mozilla/glean/SecurityManagerSslMetrics.h"
#include "mozilla/ipc/Endpoint.h"
#include "mozilla/net/SocketProcessBackgroundChild.h"
#include "mozilla/psm/SelectTLSClientAuthCertChild.h"
#include "mozilla/psm/SelectTLSClientAuthCertParent.h"
#include "nsArray.h"
#include "nsArrayUtils.h"
#include "nsNSSComponent.h"
#include "nsIClientAuthDialogService.h"
#include "nsIMutableArray.h"
#include "nsINSSComponent.h"
#include "NSSCertDBTrustDomain.h"
#include "nsIClientAuthRememberService.h"
#include "nsIX509CertDB.h"
#include "nsNSSHelper.h"
#include "mozpkix/pkixnss.h"
#include "mozpkix/pkixutil.h"
#include "mozpkix/pkix.h"
#include "secerr.h"
#include "sslerr.h"
#ifdef MOZ_WIDGET_ANDROID
# include "mozilla/java/ClientAuthCertificateManagerWrappers.h"
#endif // MOZ_WIDGET_ANDROID
using namespace mozilla;
using namespace mozilla::pkix;
using namespace mozilla::psm;
extern LazyLogModule gPIPNSSLog;
mozilla::pkix::Result BuildChainForCertificate(
nsTArray<uint8_t>& certBytes, nsTArray<nsTArray<uint8_t>>& certChainBytes,
const nsTArray<nsTArray<uint8_t>>& caNames,
const nsTArray<nsTArray<uint8_t>>& enterpriseCertificates);
// Possible behaviors for choosing a cert for client auth.
enum class UserCertChoice {
// Ask the user to choose a cert.
Ask = 0,
// Automatically choose a cert.
Auto = 1,
};
// Returns the most appropriate user cert choice based on the value of the
// security.default_personal_cert preference.
UserCertChoice nsGetUserCertChoice() {
nsAutoCString value;
nsresult rv =
Preferences::GetCString("security.default_personal_cert", value);
if (NS_FAILED(rv)) {
return UserCertChoice::Ask;
}
// There are three cases for what the preference could be set to:
// 1. "Select Automatically" -> Auto.
// 2. "Ask Every Time" -> Ask.
// 3. Something else -> Ask. This might be a nickname from a migrated cert,
// but we no longer support this case.
return value.EqualsLiteral("Select Automatically") ? UserCertChoice::Auto
: UserCertChoice::Ask;
}
static bool hasExplicitKeyUsageNonRepudiation(CERTCertificate* cert) {
// There is no extension, v1 or v2 certificate
if (!cert->extensions) return false;
SECStatus srv;
SECItem keyUsageItem;
keyUsageItem.data = nullptr;
srv = CERT_FindKeyUsageExtension(cert, &keyUsageItem);
if (srv == SECFailure) return false;
unsigned char keyUsage = keyUsageItem.data[0];
PORT_Free(keyUsageItem.data);
return !!(keyUsage & KU_NON_REPUDIATION);
}
ClientAuthInfo::ClientAuthInfo(const nsACString& hostName,
const OriginAttributes& originAttributes,
int32_t port, uint32_t providerFlags,
uint32_t providerTlsFlags)
: mHostName(hostName),
mOriginAttributes(originAttributes),
mPort(port),
mProviderFlags(providerFlags),
mProviderTlsFlags(providerTlsFlags) {}
ClientAuthInfo::ClientAuthInfo(ClientAuthInfo&& aOther) noexcept
: mHostName(std::move(aOther.mHostName)),
mOriginAttributes(std::move(aOther.mOriginAttributes)),
mPort(aOther.mPort),
mProviderFlags(aOther.mProviderFlags),
mProviderTlsFlags(aOther.mProviderTlsFlags) {}
const nsACString& ClientAuthInfo::HostName() const { return mHostName; }
const OriginAttributes& ClientAuthInfo::OriginAttributesRef() const {
return mOriginAttributes;
}
int32_t ClientAuthInfo::Port() const { return mPort; }
uint32_t ClientAuthInfo::ProviderFlags() const { return mProviderFlags; }
uint32_t ClientAuthInfo::ProviderTlsFlags() const { return mProviderTlsFlags; }
nsTArray<nsTArray<uint8_t>> CollectCANames(CERTDistNames* caNames) {
MOZ_ASSERT(caNames);
nsTArray<nsTArray<uint8_t>> collectedCANames;
if (!caNames) {
return collectedCANames;
}
for (int i = 0; i < caNames->nnames; i++) {
nsTArray<uint8_t> caName;
caName.AppendElements(caNames->names[i].data, caNames->names[i].len);
collectedCANames.AppendElement(std::move(caName));
}
return collectedCANames;
}
// This TrustDomain only exists to facilitate the mozilla::pkix path building
// algorithm. It considers any certificate with an issuer distinguished name in
// the set of given CA names to be a trust anchor. It does essentially no
// validation or verification (in particular, the signature checking function
// always returns "Success").
class ClientAuthCertNonverifyingTrustDomain final : public TrustDomain {
public:
ClientAuthCertNonverifyingTrustDomain(
const nsTArray<nsTArray<uint8_t>>& caNames,
const nsTArray<nsTArray<uint8_t>>& thirdPartyCertificates)
: mCANames(caNames),
mCertStorage(do_GetService(NS_CERT_STORAGE_CID)),
mThirdPartyCertificates(thirdPartyCertificates) {}
virtual mozilla::pkix::Result GetCertTrust(
pkix::EndEntityOrCA endEntityOrCA, const pkix::CertPolicyId& policy,
pkix::Input candidateCertDER,
/*out*/ pkix::TrustLevel& trustLevel) override;
virtual mozilla::pkix::Result FindIssuer(pkix::Input encodedIssuerName,
IssuerChecker& checker,
pkix::Time time) override;
virtual mozilla::pkix::Result CheckRevocation(
EndEntityOrCA endEntityOrCA, const pkix::CertID& certID, Time time,
mozilla::pkix::Duration validityDuration,
/*optional*/ const Input* stapledOCSPresponse,
/*optional*/ const Input* aiaExtension,
/*optional*/ const Input* sctExtension) override {
return pkix::Success;
}
virtual mozilla::pkix::Result IsChainValid(
const pkix::DERArray& certChain, pkix::Time time,
const pkix::CertPolicyId& requiredPolicy) override;
virtual mozilla::pkix::Result CheckSignatureDigestAlgorithm(
pkix::DigestAlgorithm digestAlg, pkix::EndEntityOrCA endEntityOrCA,
pkix::Time notBefore) override {
return pkix::Success;
}
virtual mozilla::pkix::Result CheckRSAPublicKeyModulusSizeInBits(
pkix::EndEntityOrCA endEntityOrCA,
unsigned int modulusSizeInBits) override {
return pkix::Success;
}
virtual mozilla::pkix::Result VerifyRSAPKCS1SignedData(
pkix::Input data, pkix::DigestAlgorithm, pkix::Input signature,
pkix::Input subjectPublicKeyInfo) override {
return pkix::Success;
}
virtual mozilla::pkix::Result VerifyRSAPSSSignedData(
pkix::Input data, pkix::DigestAlgorithm, pkix::Input signature,
pkix::Input subjectPublicKeyInfo) override {
return pkix::Success;
}
virtual mozilla::pkix::Result CheckECDSACurveIsAcceptable(
pkix::EndEntityOrCA endEntityOrCA, pkix::NamedCurve curve) override {
return pkix::Success;
}
virtual mozilla::pkix::Result VerifyECDSASignedData(
pkix::Input data, pkix::DigestAlgorithm, pkix::Input signature,
pkix::Input subjectPublicKeyInfo) override {
return pkix::Success;
}
virtual mozilla::pkix::Result CheckValidityIsAcceptable(
pkix::Time notBefore, pkix::Time notAfter,
pkix::EndEntityOrCA endEntityOrCA,
pkix::KeyPurposeId keyPurpose) override {
return pkix::Success;
}
virtual mozilla::pkix::Result NetscapeStepUpMatchesServerAuth(
pkix::Time notBefore,
/*out*/ bool& matches) override {
matches = true;
return pkix::Success;
}
virtual void NoteAuxiliaryExtension(pkix::AuxiliaryExtension extension,
pkix::Input extensionData) override {}
virtual mozilla::pkix::Result DigestBuf(pkix::Input item,
pkix::DigestAlgorithm digestAlg,
/*out*/ uint8_t* digestBuf,
size_t digestBufLen) override {
return pkix::DigestBufNSS(item, digestAlg, digestBuf, digestBufLen);
}
nsTArray<nsTArray<uint8_t>> TakeBuiltChain() {
return std::move(mBuiltChain);
}
private:
const nsTArray<nsTArray<uint8_t>>& mCANames; // non-owning
nsCOMPtr<nsICertStorage> mCertStorage;
const nsTArray<nsTArray<uint8_t>>& mThirdPartyCertificates; // non-owning
nsTArray<nsTArray<uint8_t>> mBuiltChain;
};
mozilla::pkix::Result ClientAuthCertNonverifyingTrustDomain::GetCertTrust(
pkix::EndEntityOrCA endEntityOrCA, const pkix::CertPolicyId& policy,
pkix::Input candidateCertDER,
/*out*/ pkix::TrustLevel& trustLevel) {
// If the server did not specify any CA names, all client certificates are
// acceptable.
if (mCANames.Length() == 0) {
trustLevel = pkix::TrustLevel::TrustAnchor;
return pkix::Success;
}
BackCert cert(candidateCertDER, endEntityOrCA, nullptr);
mozilla::pkix::Result rv = cert.Init();
if (rv != pkix::Success) {
return rv;
}
// If this certificate's issuer distinguished name is in the set of acceptable
// CA names, we say this is a trust anchor so that the client certificate
// issued from this certificate will be presented as an option for the user.
// We also check the certificate's subject distinguished name to account for
// the case where client certificates that have the id-kp-OCSPSigning EKU
// can't be trust anchors according to mozilla::pkix, and thus we may be
// looking directly at the issuer.
pkix::Input issuer(cert.GetIssuer());
pkix::Input subject(cert.GetSubject());
for (const auto& caName : mCANames) {
pkix::Input caNameInput;
rv = caNameInput.Init(caName.Elements(), caName.Length());
if (rv != pkix::Success) {
continue; // probably too big
}
if (InputsAreEqual(issuer, caNameInput) ||
InputsAreEqual(subject, caNameInput)) {
trustLevel = pkix::TrustLevel::TrustAnchor;
return pkix::Success;
}
}
trustLevel = pkix::TrustLevel::InheritsTrust;
return pkix::Success;
}
// In theory this implementation should only need to consider intermediate
// certificates, since in theory it should only need to look at the issuer
// distinguished name of each certificate to determine if the client
// certificate is considered acceptable to the server.
// However, because we need to account for client certificates with the
// id-kp-OCSPSigning EKU, and because mozilla::pkix doesn't allow such
// certificates to be trust anchors, we need to consider the issuers of such
// certificates directly. These issuers could be roots, so we have to consider
// roots here.
mozilla::pkix::Result ClientAuthCertNonverifyingTrustDomain::FindIssuer(
pkix::Input encodedIssuerName, IssuerChecker& checker, pkix::Time time) {
// First try all relevant certificates known to Gecko, which avoids calling
// CERT_CreateSubjectCertList, because that can be expensive.
Vector<pkix::Input> geckoCandidates;
if (!mCertStorage) {
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
nsTArray<uint8_t> subject;
subject.AppendElements(encodedIssuerName.UnsafeGetData(),
encodedIssuerName.GetLength());
nsTArray<nsTArray<uint8_t>> certs;
nsresult rv = mCertStorage->FindCertsBySubject(subject, certs);
if (NS_FAILED(rv)) {
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
for (auto& cert : certs) {
pkix::Input certDER;
mozilla::pkix::Result rv = certDER.Init(cert.Elements(), cert.Length());
if (rv != pkix::Success) {
continue; // probably too big
}
if (!geckoCandidates.append(certDER)) {
return mozilla::pkix::Result::FATAL_ERROR_NO_MEMORY;
}
}
for (const auto& thirdPartyCertificate : mThirdPartyCertificates) {
pkix::Input thirdPartyCertificateInput;
mozilla::pkix::Result rv = thirdPartyCertificateInput.Init(
thirdPartyCertificate.Elements(), thirdPartyCertificate.Length());
if (rv != pkix::Success) {
continue; // probably too big
}
if (!geckoCandidates.append(thirdPartyCertificateInput)) {
return mozilla::pkix::Result::FATAL_ERROR_NO_MEMORY;
}
}
bool keepGoing = true;
for (pkix::Input candidate : geckoCandidates) {
mozilla::pkix::Result rv = checker.Check(candidate, nullptr, keepGoing);
if (rv != pkix::Success) {
return rv;
}
if (!keepGoing) {
return pkix::Success;
}
}
SECItem encodedIssuerNameItem =
pkix::UnsafeMapInputToSECItem(encodedIssuerName);
// NSS seems not to differentiate between "no potential issuers found" and
// "there was an error trying to retrieve the potential issuers." We assume
// there was no error if CERT_CreateSubjectCertList returns nullptr.
UniqueCERTCertList candidates(CERT_CreateSubjectCertList(
nullptr, CERT_GetDefaultCertDB(), &encodedIssuerNameItem, 0, false));
Vector<pkix::Input> nssCandidates;
if (candidates) {
for (CERTCertListNode* n = CERT_LIST_HEAD(candidates);
!CERT_LIST_END(n, candidates); n = CERT_LIST_NEXT(n)) {
pkix::Input certDER;
mozilla::pkix::Result rv =
certDER.Init(n->cert->derCert.data, n->cert->derCert.len);
if (rv != pkix::Success) {
continue; // probably too big
}
if (!nssCandidates.append(certDER)) {
return mozilla::pkix::Result::FATAL_ERROR_NO_MEMORY;
}
}
}
for (pkix::Input candidate : nssCandidates) {
mozilla::pkix::Result rv = checker.Check(candidate, nullptr, keepGoing);
if (rv != pkix::Success) {
return rv;
}
if (!keepGoing) {
return pkix::Success;
}
}
return pkix::Success;
}
mozilla::pkix::Result ClientAuthCertNonverifyingTrustDomain::IsChainValid(
const pkix::DERArray& certArray, pkix::Time, const pkix::CertPolicyId&) {
mBuiltChain.Clear();
size_t numCerts = certArray.GetLength();
for (size_t i = 0; i < numCerts; ++i) {
nsTArray<uint8_t> certBytes;
const pkix::Input* certInput = certArray.GetDER(i);
MOZ_ASSERT(certInput != nullptr);
if (!certInput) {
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
certBytes.AppendElements(certInput->UnsafeGetData(),
certInput->GetLength());
mBuiltChain.AppendElement(std::move(certBytes));
}
return pkix::Success;
}
nsTArray<nsTArray<uint8_t>> GetEnterpriseCertificates() {
nsTArray<nsTArray<uint8_t>> enterpriseCertificates;
nsCOMPtr<nsINSSComponent> component(do_GetService(PSM_COMPONENT_CONTRACTID));
if (!component) {
return nsTArray<nsTArray<uint8_t>>{};
}
nsresult rv = component->GetEnterpriseIntermediates(enterpriseCertificates);
if (NS_FAILED(rv)) {
return nsTArray<nsTArray<uint8_t>>{};
}
nsTArray<nsTArray<uint8_t>> enterpriseRoots;
rv = component->GetEnterpriseRoots(enterpriseRoots);
if (NS_FAILED(rv)) {
return nsTArray<nsTArray<uint8_t>>{};
}
enterpriseCertificates.AppendElements(std::move(enterpriseRoots));
return enterpriseCertificates;
}
bool FindRememberedDecision(
const ClientAuthInfo& clientAuthInfo,
const nsTArray<nsTArray<uint8_t>>& caNames,
const nsTArray<nsTArray<uint8_t>>& enterpriseCertificates,
nsTArray<uint8_t>& rememberedCertBytes,
nsTArray<nsTArray<uint8_t>>& rememberedCertChainBytes) {
rememberedCertBytes.Clear();
rememberedCertChainBytes.Clear();
if (clientAuthInfo.ProviderTlsFlags() != 0) {
return false;
}
nsCOMPtr<nsIClientAuthRememberService> clientAuthRememberService(
do_GetService(NS_CLIENTAUTHREMEMBERSERVICE_CONTRACTID));
if (!clientAuthRememberService) {
return false;
}
nsCString rememberedDBKey;
bool found;
nsresult rv = clientAuthRememberService->HasRememberedDecision(
clientAuthInfo.HostName(), clientAuthInfo.OriginAttributesRef(),
rememberedDBKey, &found);
if (NS_FAILED(rv)) {
return false;
}
if (!found) {
return false;
}
// An empty dbKey indicates that the user chose not to use a certificate
// and chose to remember this decision
if (rememberedDBKey.IsEmpty()) {
return true;
}
nsCOMPtr<nsIX509CertDB> certdb(do_GetService(NS_X509CERTDB_CONTRACTID));
if (!certdb) {
return false;
}
nsCOMPtr<nsIX509Cert> foundCert;
rv = certdb->FindCertByDBKey(rememberedDBKey, getter_AddRefs(foundCert));
if (NS_FAILED(rv)) {
return false;
}
if (!foundCert) {
return false;
}
rv = foundCert->GetRawDER(rememberedCertBytes);
if (NS_FAILED(rv)) {
return false;
}
if (BuildChainForCertificate(rememberedCertBytes, rememberedCertChainBytes,
caNames, enterpriseCertificates) != Success) {
return false;
}
return true;
}
// Filter potential client certificates by the specified CA names, if any. This
// operation potentially builds a certificate chain for each candidate client
// certificate. Keeping those chains around means they don't have to be
// re-built later when the user selects a particular client certificate.
void FilterPotentialClientCertificatesByCANames(
UniqueCERTCertList& potentialClientCertificates,
const nsTArray<nsTArray<uint8_t>>& caNames,
const nsTArray<nsTArray<uint8_t>>& enterpriseCertificates,
nsTArray<nsTArray<nsTArray<uint8_t>>>& potentialClientCertificateChains) {
if (!potentialClientCertificates) {
return;
}
CERTCertListNode* n = CERT_LIST_HEAD(potentialClientCertificates);
while (!CERT_LIST_END(n, potentialClientCertificates)) {
nsTArray<nsTArray<uint8_t>> builtChain;
nsTArray<uint8_t> certBytes;
certBytes.AppendElements(n->cert->derCert.data, n->cert->derCert.len);
mozilla::pkix::Result result = BuildChainForCertificate(
certBytes, builtChain, caNames, enterpriseCertificates);
if (result != pkix::Success) {
MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
("removing cert '%s'", n->cert->subjectName));
CERTCertListNode* toRemove = n;
n = CERT_LIST_NEXT(n);
CERT_RemoveCertListNode(toRemove);
continue;
}
potentialClientCertificateChains.AppendElement(std::move(builtChain));
MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
("keeping cert '%s'\n", n->cert->subjectName));
n = CERT_LIST_NEXT(n);
}
}
void ClientAuthCertificateSelectedBase::SetSelectedClientAuthData(
nsTArray<uint8_t>&& selectedCertBytes,
nsTArray<nsTArray<uint8_t>>&& selectedCertChainBytes) {
mSelectedCertBytes = std::move(selectedCertBytes);
mSelectedCertChainBytes = std::move(selectedCertChainBytes);
}
NS_IMETHODIMP
ClientAuthCertificateSelected::Run() {
mSocketInfo->ClientAuthCertificateSelected(mSelectedCertBytes,
mSelectedCertChainBytes);
return NS_OK;
}
void SelectClientAuthCertificate::DispatchContinuation(
nsTArray<uint8_t>&& selectedCertBytes) {
nsTArray<nsTArray<uint8_t>> selectedCertChainBytes;
// Attempt to find a pre-built certificate chain corresponding to the
// selected certificate.
// On Android, there are no pre-built certificate chains, so use what the OS
// says is the issuer certificate chain.
#ifdef MOZ_WIDGET_ANDROID
if (jni::IsAvailable()) {
jni::ByteArray::LocalRef certBytes = jni::ByteArray::New(
reinterpret_cast<const int8_t*>(selectedCertBytes.Elements()),
selectedCertBytes.Length());
jni::ObjectArray::LocalRef issuersBytes =
java::ClientAuthCertificateManager::GetCertificateIssuersBytes(
certBytes);
if (issuersBytes) {
for (size_t i = 0; i < issuersBytes->Length(); i++) {
jni::ByteArray::LocalRef issuer = issuersBytes->GetElement(i);
nsTArray<uint8_t> issuerBytes(
reinterpret_cast<uint8_t*>(issuer->GetElements().Elements()),
issuer->Length());
selectedCertChainBytes.AppendElement(std::move(issuerBytes));
}
}
}
#else
for (const auto& clientCertificateChain : mPotentialClientCertificateChains) {
if (clientCertificateChain.Length() > 0 &&
clientCertificateChain[0] == selectedCertBytes) {
for (const auto& certificateBytes : clientCertificateChain) {
selectedCertChainBytes.AppendElement(certificateBytes.Clone());
}
break;
}
}
#endif // MOZ_WIDGET_ANDROID
mContinuation->SetSelectedClientAuthData(std::move(selectedCertBytes),
std::move(selectedCertChainBytes));
nsCOMPtr<nsIEventTarget> socketThread(
do_GetService(NS_SOCKETTRANSPORTSERVICE_CONTRACTID));
if (socketThread) {
(void)socketThread->Dispatch(mContinuation, NS_DISPATCH_NORMAL);
}
}
// Helper function to build a certificate chain from the given certificate to a
// trust anchor in the set indicated by the peer (mCANames). This is essentially
// best-effort, so no signature verification occurs.
mozilla::pkix::Result BuildChainForCertificate(
nsTArray<uint8_t>& certBytes, nsTArray<nsTArray<uint8_t>>& certChainBytes,
const nsTArray<nsTArray<uint8_t>>& caNames,
const nsTArray<nsTArray<uint8_t>>& enterpriseCertificates) {
ClientAuthCertNonverifyingTrustDomain trustDomain(caNames,
enterpriseCertificates);
pkix::Input certDER;
mozilla::pkix::Result result =
certDER.Init(certBytes.Elements(), certBytes.Length());
if (result != pkix::Success) {
return result;
}
// Client certificates shouldn't be CAs, but for interoperability reasons we
// attempt to build a path with each certificate as an end entity and then as
// a CA if that fails.
const pkix::EndEntityOrCA kEndEntityOrCAParams[] = {
pkix::EndEntityOrCA::MustBeEndEntity, pkix::EndEntityOrCA::MustBeCA};
// mozilla::pkix rejects certificates with id-kp-OCSPSigning unless it is
// specifically required. A client certificate should never have this EKU.
// Unfortunately, there are some client certificates in private PKIs that
// have this EKU. For interoperability, we attempt to work around this
// restriction in mozilla::pkix by first building the certificate chain with
// no particular EKU required and then again with id-kp-OCSPSigning required
// if that fails.
const pkix::KeyPurposeId kKeyPurposeIdParams[] = {
pkix::KeyPurposeId::anyExtendedKeyUsage,
pkix::KeyPurposeId::id_kp_OCSPSigning};
for (const auto& endEntityOrCAParam : kEndEntityOrCAParams) {
for (const auto& keyPurposeIdParam : kKeyPurposeIdParams) {
mozilla::pkix::Result result = BuildCertChain(
trustDomain, certDER, Now(), endEntityOrCAParam,
KeyUsage::noParticularKeyUsageRequired, keyPurposeIdParam,
pkix::CertPolicyId::anyPolicy, nullptr);
if (result == pkix::Success) {
certChainBytes = trustDomain.TakeBuiltChain();
return pkix::Success;
}
}
}
return mozilla::pkix::Result::ERROR_UNKNOWN_ISSUER;
}
class ClientAuthDialogCallback : public nsIClientAuthDialogCallback {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSICLIENTAUTHDIALOGCALLBACK
explicit ClientAuthDialogCallback(
SelectClientAuthCertificate* selectClientAuthCertificate)
: mSelectClientAuthCertificate(selectClientAuthCertificate) {}
private:
virtual ~ClientAuthDialogCallback() = default;
RefPtr<SelectClientAuthCertificate> mSelectClientAuthCertificate;
};
NS_IMPL_ISUPPORTS(ClientAuthDialogCallback, nsIClientAuthDialogCallback)
NS_IMETHODIMP
ClientAuthDialogCallback::CertificateChosen(
nsIX509Cert* cert,
nsIClientAuthRememberService::Duration rememberDuration) {
MOZ_ASSERT(mSelectClientAuthCertificate);
if (!mSelectClientAuthCertificate) {
return NS_ERROR_FAILURE;
}
const ClientAuthInfo& info = mSelectClientAuthCertificate->Info();
nsCOMPtr<nsIClientAuthRememberService> clientAuthRememberService(
do_GetService(NS_CLIENTAUTHREMEMBERSERVICE_CONTRACTID));
if (info.ProviderTlsFlags() == 0 && clientAuthRememberService) {
(void)clientAuthRememberService->RememberDecision(
info.HostName(), info.OriginAttributesRef(), cert, rememberDuration);
}
nsTArray<uint8_t> selectedCertBytes;
if (cert) {
nsresult rv = cert->GetRawDER(selectedCertBytes);
if (NS_FAILED(rv)) {
selectedCertBytes.Clear();
mSelectClientAuthCertificate->DispatchContinuation(
std::move(selectedCertBytes));
return rv;
}
}
mSelectClientAuthCertificate->DispatchContinuation(
std::move(selectedCertBytes));
return NS_OK;
}
NS_IMETHODIMP
SelectClientAuthCertificate::Run() {
// We check the value of a pref, so this should only be run on the main
// thread.
MOZ_ASSERT(NS_IsMainThread());
nsTArray<uint8_t> selectedCertBytes;
// find valid user cert and key pair
if (nsGetUserCertChoice() == UserCertChoice::Auto) {
// automatically find the right cert
UniqueCERTCertificate lowPrioNonrepCert;
// loop through the list until we find a cert with a key
for (CERTCertListNode* node = CERT_LIST_HEAD(mPotentialClientCertificates);
!CERT_LIST_END(node, mPotentialClientCertificates);
node = CERT_LIST_NEXT(node)) {
UniqueSECKEYPrivateKey tmpKey(PK11_FindKeyByAnyCert(node->cert, nullptr));
if (tmpKey) {
if (hasExplicitKeyUsageNonRepudiation(node->cert)) {
// Not a preferred cert
if (!lowPrioNonrepCert) { // did not yet find a low prio cert
lowPrioNonrepCert.reset(CERT_DupCertificate(node->cert));
}
} else {
// this is a good cert to present
selectedCertBytes.AppendElements(node->cert->derCert.data,
node->cert->derCert.len);
DispatchContinuation(std::move(selectedCertBytes));
return NS_OK;
}
}
if (PR_GetError() == SEC_ERROR_BAD_PASSWORD) {
// problem with password: bail
break;
}
}
if (lowPrioNonrepCert) {
selectedCertBytes.AppendElements(lowPrioNonrepCert->derCert.data,
lowPrioNonrepCert->derCert.len);
}
DispatchContinuation(std::move(selectedCertBytes));
return NS_OK;
}
// Not Auto => ask the user to select a certificate
nsTArray<RefPtr<nsIX509Cert>> certArray;
for (CERTCertListNode* node = CERT_LIST_HEAD(mPotentialClientCertificates);
!CERT_LIST_END(node, mPotentialClientCertificates);
node = CERT_LIST_NEXT(node)) {
RefPtr<nsIX509Cert> tempCert(new nsNSSCertificate(node->cert));
certArray.AppendElement(tempCert);
}
nsCOMPtr<nsIClientAuthDialogService> clientAuthDialogService(
do_GetService(NS_CLIENTAUTHDIALOGSERVICE_CONTRACTID));
if (!clientAuthDialogService) {
DispatchContinuation(std::move(selectedCertBytes));
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsILoadContext> loadContext = nullptr;
if (mBrowserId != 0) {
loadContext =
mozilla::dom::BrowsingContext::GetCurrentTopByBrowserId(mBrowserId);
}
RefPtr<nsIClientAuthDialogCallback> callback(
new ClientAuthDialogCallback(this));
nsresult rv = clientAuthDialogService->ChooseCertificate(
mInfo.HostName(), certArray, loadContext, callback);
if (NS_FAILED(rv)) {
DispatchContinuation(std::move(selectedCertBytes));
return rv;
}
return NS_OK;
}
SECStatus SSLGetClientAuthDataHook(void* arg, PRFileDesc* socket,
CERTDistNames* caNamesDecoded,
CERTCertificate** pRetCert,
SECKEYPrivateKey** pRetKey) {
MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
("[%p] SSLGetClientAuthDataHook", socket));
if (!arg || !socket || !caNamesDecoded || !pRetCert || !pRetKey) {
PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
return SECFailure;
}
*pRetCert = nullptr;
*pRetKey = nullptr;
RefPtr<NSSSocketControl> info(static_cast<NSSSocketControl*>(arg));
glean::security::client_auth_cert_usage.Get("requested"_ns).Add(1);
if (info->GetDenyClientCert()) {
MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
("[%p] Not returning client cert due to denyClientCert attribute",
socket));
return SECSuccess;
}
if (info->GetJoined()) {
// We refuse to send a client certificate when there are multiple hostnames
// joined on this connection, because we only show the user one hostname
// (mHostName) in the client certificate UI.
MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
("[%p] Not returning client cert due to previous join", socket));
return SECSuccess;
}
UniqueCERTCertificate serverCert(SSL_PeerCertificate(socket));
if (!serverCert) {
PR_SetError(SSL_ERROR_NO_CERTIFICATE, 0);
return SECFailure;
}
uint64_t browserId;
if (NS_FAILED(info->GetBrowserId(&browserId))) {
PR_SetError(SEC_ERROR_LIBRARY_FAILURE, 0);
return SECFailure;
}
nsTArray<nsTArray<uint8_t>> caNames(CollectCANames(caNamesDecoded));
RefPtr<ClientAuthCertificateSelected> continuation(
new ClientAuthCertificateSelected(info));
// If this is the socket process, dispatch an IPC call to select a client
// authentication certificate in the parent process.
// Otherwise, dispatch an event to the main thread to do the selection.
// When those events finish, they will run the continuation, which gives the
// appropriate information to the NSSSocketControl, which then calls
// SSL_ClientCertCallbackComplete to continue the connection.
if (XRE_IsSocketProcess()) {
RefPtr<SelectTLSClientAuthCertChild> selectClientAuthCertificate(
new SelectTLSClientAuthCertChild(continuation));
nsAutoCString hostname(info->GetHostName());
nsTArray<uint8_t> serverCertBytes;
nsTArray<ByteArray> caNamesBytes;
for (const auto& caName : caNames) {
caNamesBytes.AppendElement(ByteArray(std::move(caName)));
}
serverCertBytes.AppendElements(serverCert->derCert.data,
serverCert->derCert.len);
OriginAttributes originAttributes(info->GetOriginAttributes());
int32_t port(info->GetPort());
uint32_t providerFlags(info->GetProviderFlags());
uint32_t providerTlsFlags(info->GetProviderTlsFlags());
nsCOMPtr<nsIRunnable> remoteSelectClientAuthCertificate(
NS_NewRunnableFunction(
"RemoteSelectClientAuthCertificate",
[selectClientAuthCertificate(
std::move(selectClientAuthCertificate)),
hostname(std::move(hostname)),
originAttributes(std::move(originAttributes)), port, providerFlags,
providerTlsFlags, serverCertBytes(std::move(serverCertBytes)),
caNamesBytes(std::move(caNamesBytes)),
browserId(browserId)]() mutable {
ipc::Endpoint<PSelectTLSClientAuthCertParent> parentEndpoint;
ipc::Endpoint<PSelectTLSClientAuthCertChild> childEndpoint;
PSelectTLSClientAuthCert::CreateEndpoints(&parentEndpoint,
&childEndpoint);
if (NS_FAILED(net::SocketProcessBackgroundChild::WithActor(
"SendInitSelectTLSClientAuthCert",
[endpoint = std::move(parentEndpoint),
hostname(std::move(hostname)),
originAttributes(std::move(originAttributes)), port,
providerFlags, providerTlsFlags,
serverCertBytes(std::move(serverCertBytes)),
caNamesBytes(std::move(caNamesBytes)), browserId](
net::SocketProcessBackgroundChild* aActor) mutable {
Unused << aActor->SendInitSelectTLSClientAuthCert(
std::move(endpoint), hostname, originAttributes,
port, providerFlags, providerTlsFlags,
ByteArray(serverCertBytes), caNamesBytes,
browserId);
}))) {
return;
}
if (!childEndpoint.Bind(selectClientAuthCertificate)) {
return;
}
}));
info->SetPendingSelectClientAuthCertificate(
std::move(remoteSelectClientAuthCertificate));
PR_SetError(PR_WOULD_BLOCK_ERROR, 0);
return SECWouldBlock;
}
ClientAuthInfo authInfo(info->GetHostName(), info->GetOriginAttributes(),
info->GetPort(), info->GetProviderFlags(),
info->GetProviderTlsFlags());
nsTArray<nsTArray<uint8_t>> enterpriseCertificates(
GetEnterpriseCertificates());
nsTArray<uint8_t> rememberedCertBytes;
nsTArray<nsTArray<uint8_t>> rememberedCertChainBytes;
if (FindRememberedDecision(authInfo, caNames, enterpriseCertificates,
rememberedCertBytes, rememberedCertChainBytes)) {
continuation->SetSelectedClientAuthData(
std::move(rememberedCertBytes), std::move(rememberedCertChainBytes));
nsresult rv = NS_DispatchToCurrentThread(continuation);
if (NS_FAILED(rv)) {
PR_SetError(SEC_ERROR_LIBRARY_FAILURE, 0);
return SECFailure;
}
PR_SetError(PR_WOULD_BLOCK_ERROR, 0);
return SECWouldBlock;
}
// Instantiating certificates in NSS is not thread-safe and has performance
// implications, so search for them here (on the socket thread).
UniqueCERTCertList potentialClientCertificates(
FindClientCertificatesWithPrivateKeys());
if (!potentialClientCertificates) {
MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
("[%p] FindClientCertificatesWithPrivateKeys() returned null (out "
"of memory?)",
socket));
return SECSuccess;
}
nsTArray<nsTArray<nsTArray<uint8_t>>> potentialClientCertificateChains;
// On Android, gathering potential client certificates and filtering them by
// issuer is handled by the OS, so `potentialClientCertificates` is expected
// to be empty here.
#ifndef MOZ_WIDGET_ANDROID
FilterPotentialClientCertificatesByCANames(potentialClientCertificates,
caNames, enterpriseCertificates,
potentialClientCertificateChains);
if (CERT_LIST_EMPTY(potentialClientCertificates)) {
MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
("[%p] no client certificates available after filtering by CA",
socket));
return SECSuccess;
}
#endif // MOZ_WIDGET_ANDROID
nsCOMPtr<nsIRunnable> selectClientAuthCertificate(
new SelectClientAuthCertificate(
std::move(authInfo), std::move(serverCert),
std::move(potentialClientCertificates),
std::move(potentialClientCertificateChains), continuation,
browserId));
info->SetPendingSelectClientAuthCertificate(
std::move(selectClientAuthCertificate));
// Meanwhile, tell NSS this connection is blocking for now.
PR_SetError(PR_WOULD_BLOCK_ERROR, 0);
return SECWouldBlock;
}
// Helper continuation for when a client authentication certificate has been
// selected in the parent process and the information needs to be sent to the
// socket process.
class RemoteClientAuthCertificateSelected
: public ClientAuthCertificateSelectedBase {
public:
explicit RemoteClientAuthCertificateSelected(
SelectTLSClientAuthCertParent* selectTLSClientAuthCertParent)
: mSelectTLSClientAuthCertParent(selectTLSClientAuthCertParent),
mEventTarget(GetCurrentSerialEventTarget()) {}
NS_IMETHOD Run() override;
private:
RefPtr<SelectTLSClientAuthCertParent> mSelectTLSClientAuthCertParent;
nsCOMPtr<nsISerialEventTarget> mEventTarget;
};
NS_IMETHODIMP
RemoteClientAuthCertificateSelected::Run() {
// When this runs, it dispatches an event to the IPC thread it originally came
// from in order to send the IPC call to the socket process that a client
// authentication certificate has been selected.
return mEventTarget->Dispatch(
NS_NewRunnableFunction(
"psm::RemoteClientAuthCertificateSelected::Run",
[parent(mSelectTLSClientAuthCertParent),
certBytes(std::move(mSelectedCertBytes)),
builtCertChain(std::move(mSelectedCertChainBytes))]() mutable {
parent->TLSClientAuthCertSelected(certBytes,
std::move(builtCertChain));
}),
NS_DISPATCH_NORMAL);
}
namespace mozilla::psm {
// Given some information from the socket process about a connection that
// requested a client authentication certificate, this function dispatches an
// event to the main thread to ask the user to select one. When the user does so
// (or selects no certificate), the continuation runs and sends the information
// back via IPC.
bool SelectTLSClientAuthCertParent::Dispatch(
const nsACString& aHostName, const OriginAttributes& aOriginAttributes,
const int32_t& aPort, const uint32_t& aProviderFlags,
const uint32_t& aProviderTlsFlags, const ByteArray& aServerCertBytes,
nsTArray<ByteArray>&& aCANames, const uint64_t& aBrowserId) {
RefPtr<ClientAuthCertificateSelectedBase> continuation(
new RemoteClientAuthCertificateSelected(this));
ClientAuthInfo authInfo(aHostName, aOriginAttributes, aPort, aProviderFlags,
aProviderTlsFlags);
nsCOMPtr<nsIEventTarget> socketThread =
do_GetService(NS_SOCKETTRANSPORTSERVICE_CONTRACTID);
if (NS_WARN_IF(!socketThread)) {
return false;
}
// Dispatch the work of instantiating a CERTCertificate and searching for
// client certificates to the socket thread.
nsresult rv = socketThread->Dispatch(NS_NewRunnableFunction(
"SelectTLSClientAuthCertParent::Dispatch",
[authInfo(std::move(authInfo)), continuation(std::move(continuation)),
serverCertBytes(aServerCertBytes), caNames(std::move(aCANames)),
browserId(aBrowserId)]() mutable {
SECItem serverCertItem{
siBuffer,
const_cast<uint8_t*>(serverCertBytes.data().Elements()),
static_cast<unsigned int>(serverCertBytes.data().Length()),
};
UniqueCERTCertificate serverCert(CERT_NewTempCertificate(
CERT_GetDefaultCertDB(), &serverCertItem, nullptr, false, true));
if (!serverCert) {
return;
}
nsTArray<nsTArray<uint8_t>> caNamesArray;
for (auto& caName : caNames) {
caNamesArray.AppendElement(std::move(caName.data()));
}
nsTArray<nsTArray<uint8_t>> enterpriseCertificates(
GetEnterpriseCertificates());
nsTArray<uint8_t> rememberedCertBytes;
nsTArray<nsTArray<uint8_t>> rememberedCertChainBytes;
if (FindRememberedDecision(authInfo, caNamesArray,
enterpriseCertificates, rememberedCertBytes,
rememberedCertChainBytes)) {
continuation->SetSelectedClientAuthData(
std::move(rememberedCertBytes),
std::move(rememberedCertChainBytes));
(void)NS_DispatchToCurrentThread(continuation);
return;
}
UniqueCERTCertList potentialClientCertificates(
FindClientCertificatesWithPrivateKeys());
nsTArray<nsTArray<nsTArray<uint8_t>>> potentialClientCertificateChains;
FilterPotentialClientCertificatesByCANames(
potentialClientCertificates, caNamesArray, enterpriseCertificates,
potentialClientCertificateChains);
RefPtr<SelectClientAuthCertificate> selectClientAuthCertificate(
new SelectClientAuthCertificate(
std::move(authInfo), std::move(serverCert),
std::move(potentialClientCertificates),
std::move(potentialClientCertificateChains), continuation,
browserId));
Unused << NS_DispatchToMainThread(selectClientAuthCertificate);
}));
return NS_SUCCEEDED(rv);
}
void SelectTLSClientAuthCertParent::TLSClientAuthCertSelected(
const nsTArray<uint8_t>& aSelectedCertBytes,
nsTArray<nsTArray<uint8_t>>&& aSelectedCertChainBytes) {
if (!CanSend()) {
return;
}
nsTArray<ByteArray> selectedCertChainBytes;
for (auto& certBytes : aSelectedCertChainBytes) {
selectedCertChainBytes.AppendElement(ByteArray(certBytes));
}
Unused << SendTLSClientAuthCertSelected(aSelectedCertBytes,
selectedCertChainBytes);
Close();
}
void SelectTLSClientAuthCertParent::ActorDestroy(
mozilla::ipc::IProtocol::ActorDestroyReason aWhy) {}
SelectTLSClientAuthCertChild::SelectTLSClientAuthCertChild(
ClientAuthCertificateSelected* continuation)
: mContinuation(continuation) {}
// When the user has selected (or not) a client authentication certificate in
// the parent, this function receives that information in the socket process and
// dispatches a continuation to the socket process to continue the connection.
ipc::IPCResult SelectTLSClientAuthCertChild::RecvTLSClientAuthCertSelected(
ByteArray&& aSelectedCertBytes,
nsTArray<ByteArray>&& aSelectedCertChainBytes) {
nsTArray<uint8_t> selectedCertBytes(std::move(aSelectedCertBytes.data()));
nsTArray<nsTArray<uint8_t>> selectedCertChainBytes;
for (auto& certBytes : aSelectedCertChainBytes) {
selectedCertChainBytes.AppendElement(std::move(certBytes.data()));
}
mContinuation->SetSelectedClientAuthData(std::move(selectedCertBytes),
std::move(selectedCertChainBytes));
nsCOMPtr<nsIEventTarget> socketThread =
do_GetService(NS_SOCKETTRANSPORTSERVICE_CONTRACTID);
if (NS_WARN_IF(!socketThread)) {
return IPC_OK();
}
nsresult rv = socketThread->Dispatch(mContinuation, NS_DISPATCH_NORMAL);
Unused << NS_WARN_IF(NS_FAILED(rv));
return IPC_OK();
}
} // namespace mozilla::psm