Magic-Mirror/gecko-dev
1
0
Fork 0
mirror of https://github.com/mozilla/gecko-dev.git synced 2024-12-02 18:08:58 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
e5ac4993b9
gecko-dev/security/certverifier/NSSCertDBTrustDomain.cpp

1994 lines
76 KiB
C++
Raw Blame History

/* -*- 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 "NSSCertDBTrustDomain.h"
#include <stdint.h>
#include <utility>
#include "CRLiteTimestamp.h"
#include "ExtendedValidation.h"
#include "MultiLogCTVerifier.h"
#include "NSSErrorsService.h"
#include "PublicKeyPinningService.h"
#include "cert.h"
#include "cert_storage/src/cert_storage.h"
#include "certdb.h"
#include "mozilla/AppShutdown.h"
#include "mozilla/Assertions.h"
#include "mozilla/Casting.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/Logging.h"
#include "mozilla/PodOperations.h"
#include "mozilla/Services.h"
#include "mozilla/StaticPrefs_security.h"
#include "mozilla/SyncRunnable.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/Unused.h"
#include "mozpkix/Result.h"
#include "mozpkix/pkix.h"
#include "mozpkix/pkixnss.h"
#include "mozpkix/pkixutil.h"
#include "nsCRTGlue.h"
#include "nsIObserverService.h"
#include "nsNetCID.h"
#include "nsNSSCallbacks.h"
#include "nsNSSCertHelper.h"
#include "nsNSSCertificate.h"
#include "nsNSSCertificateDB.h"
#include "nsNSSIOLayer.h"
#include "nsPrintfCString.h"
#include "nsServiceManagerUtils.h"
#include "nsThreadUtils.h"
#include "nss.h"
#include "pk11pub.h"
#include "prerror.h"
#include "secder.h"
#include "secerr.h"
#include "TrustOverrideUtils.h"
#include "TrustOverride-AppleGoogleDigiCertData.inc"
#include "TrustOverride-SymantecData.inc"
using namespace mozilla;
using namespace mozilla::ct;
using namespace mozilla::pkix;
extern LazyLogModule gCertVerifierLog;
static const uint64_t ServerFailureDelaySeconds = 5 * 60;
namespace mozilla {
namespace psm {
NSSCertDBTrustDomain::NSSCertDBTrustDomain(
SECTrustType certDBTrustType, OCSPFetching ocspFetching,
OCSPCache& ocspCache,
/*optional but shouldn't be*/ void* pinArg, TimeDuration ocspTimeoutSoft,
TimeDuration ocspTimeoutHard, uint32_t certShortLifetimeInDays,
unsigned int minRSABits, ValidityCheckingMode validityCheckingMode,
NetscapeStepUpPolicy netscapeStepUpPolicy, CRLiteMode crliteMode,
const OriginAttributes& originAttributes,
const nsTArray<Input>& thirdPartyRootInputs,
const nsTArray<Input>& thirdPartyIntermediateInputs,
const Maybe<nsTArray<nsTArray<uint8_t>>>& extraCertificates,
/*out*/ nsTArray<nsTArray<uint8_t>>& builtChain,
/*optional*/ PinningTelemetryInfo* pinningTelemetryInfo,
/*optional*/ const char* hostname)
: mCertDBTrustType(certDBTrustType),
mOCSPFetching(ocspFetching),
mOCSPCache(ocspCache),
mPinArg(pinArg),
mOCSPTimeoutSoft(ocspTimeoutSoft),
mOCSPTimeoutHard(ocspTimeoutHard),
mCertShortLifetimeInDays(certShortLifetimeInDays),
mMinRSABits(minRSABits),
mValidityCheckingMode(validityCheckingMode),
mNetscapeStepUpPolicy(netscapeStepUpPolicy),
mCRLiteMode(crliteMode),
mSawDistrustedCAByPolicyError(false),
mOriginAttributes(originAttributes),
mThirdPartyRootInputs(thirdPartyRootInputs),
mThirdPartyIntermediateInputs(thirdPartyIntermediateInputs),
mExtraCertificates(extraCertificates),
mBuiltChain(builtChain),
mIsBuiltChainRootBuiltInRoot(false),
mPinningTelemetryInfo(pinningTelemetryInfo),
mHostname(hostname),
mCertStorage(do_GetService(NS_CERT_STORAGE_CID)),
mOCSPStaplingStatus(CertVerifier::OCSP_STAPLING_NEVER_CHECKED),
mBuiltInRootsModule(SECMOD_FindModule(kRootModuleName)),
mOCSPFetchStatus(OCSPFetchStatus::NotFetched) {}
static void FindRootsWithSubject(UniqueSECMODModule& rootsModule,
SECItem subject,
/*out*/ nsTArray<nsTArray<uint8_t>>& roots) {
MOZ_ASSERT(rootsModule);
AutoSECMODListReadLock lock;
for (int slotIndex = 0; slotIndex < rootsModule->slotCount; slotIndex++) {
CERTCertificateList* rawResults = nullptr;
if (PK11_FindRawCertsWithSubject(rootsModule->slots[slotIndex], &subject,
&rawResults) != SECSuccess) {
continue;
}
// rawResults == nullptr means we didn't find any matching certificates
if (!rawResults) {
continue;
}
UniqueCERTCertificateList results(rawResults);
for (int certIndex = 0; certIndex < results->len; certIndex++) {
nsTArray<uint8_t> root;
root.AppendElements(results->certs[certIndex].data,
results->certs[certIndex].len);
roots.AppendElement(std::move(root));
}
}
}
// A self-signed issuer certificate should never be necessary in order to build
// a trusted certificate chain unless it is a trust anchor. This is because if
// it were necessary, there would exist another certificate with the same
// subject and public key that is also a valid issing certificate. Given this
// certificate, it is possible to build another chain using just it instead of
// it and the self-signed certificate. This is only true as long as the
// certificate extensions we support are restrictive rather than additive in
// terms of the rest of the chain (for example, we don't support policy mapping
// and we ignore any SCT information in intermediates).
bool NSSCertDBTrustDomain::ShouldSkipSelfSignedNonTrustAnchor(Input certDER) {
BackCert cert(certDER, EndEntityOrCA::MustBeCA, nullptr);
if (cert.Init() != Success) {
return false; // turn any failures into "don't skip trying this cert"
}
// If subject != issuer, this isn't a self-signed cert.
if (!InputsAreEqual(cert.GetSubject(), cert.GetIssuer())) {
return false;
}
TrustLevel trust;
if (GetCertTrust(EndEntityOrCA::MustBeCA, CertPolicyId::anyPolicy, certDER,
trust) != Success) {
return false;
}
// If the trust for this certificate is anything other than "inherit", we want
// to process it like normal.
if (trust != TrustLevel::InheritsTrust) {
return false;
}
if (VerifySignedData(*this, cert.GetSignedData(),
cert.GetSubjectPublicKeyInfo()) != Success) {
return false;
}
// This is a self-signed, non-trust-anchor certificate, so we shouldn't use it
// for path building. See bug 1056341.
return true;
}
Result NSSCertDBTrustDomain::CheckCandidates(
IssuerChecker& checker, nsTArray<IssuerCandidateWithSource>& candidates,
Input* nameConstraintsInputPtr, bool& keepGoing) {
for (const auto& candidate : candidates) {
// Stop path building if the program is shutting down.
if (AppShutdown::IsInOrBeyond(ShutdownPhase::AppShutdownConfirmed)) {
keepGoing = false;
return Success;
}
if (ShouldSkipSelfSignedNonTrustAnchor(candidate.mDER)) {
continue;
}
Result rv =
checker.Check(candidate.mDER, nameConstraintsInputPtr, keepGoing);
if (rv != Success) {
return rv;
}
if (!keepGoing) {
mIssuerSources += candidate.mIssuerSource;
return Success;
}
}
return Success;
}
Result NSSCertDBTrustDomain::FindIssuer(Input encodedIssuerName,
IssuerChecker& checker, Time) {
SECItem encodedIssuerNameItem = UnsafeMapInputToSECItem(encodedIssuerName);
// Handle imposed name constraints, if any.
ScopedAutoSECItem nameConstraints;
Input nameConstraintsInput;
Input* nameConstraintsInputPtr = nullptr;
SECStatus srv =
CERT_GetImposedNameConstraints(&encodedIssuerNameItem, &nameConstraints);
if (srv == SECSuccess) {
if (nameConstraintsInput.Init(nameConstraints.data, nameConstraints.len) !=
Success) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
nameConstraintsInputPtr = &nameConstraintsInput;
} else if (PR_GetError() != SEC_ERROR_EXTENSION_NOT_FOUND) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
// First try all relevant certificates known to Gecko, which avoids calling
// CERT_CreateSubjectCertList, because that can be expensive.
nsTArray<IssuerCandidateWithSource> geckoRootCandidates;
nsTArray<IssuerCandidateWithSource> geckoIntermediateCandidates;
// We might not have this module if e.g. we're on a Linux distribution that
// does something unexpected.
nsTArray<nsTArray<uint8_t>> builtInRoots;
if (mBuiltInRootsModule) {
FindRootsWithSubject(mBuiltInRootsModule, encodedIssuerNameItem,
builtInRoots);
for (const auto& root : builtInRoots) {
Input rootInput;
Result rv = rootInput.Init(root.Elements(), root.Length());
if (rv != Success) {
continue; // probably too big
}
geckoRootCandidates.AppendElement(IssuerCandidateWithSource{
rootInput, IssuerSource::BuiltInRootsModule});
}
} else {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::FindIssuer: no built-in roots module"));
}
if (mExtraCertificates.isSome()) {
for (const auto& extraCert : *mExtraCertificates) {
Input certInput;
Result rv = certInput.Init(extraCert.Elements(), extraCert.Length());
if (rv != Success) {
continue;
}
BackCert cert(certInput, EndEntityOrCA::MustBeCA, nullptr);
rv = cert.Init();
if (rv != Success) {
continue;
}
// Filter out certificates that can't be issuers we're looking for because
// the subject distinguished name doesn't match. This prevents
// mozilla::pkix from accumulating spurious errors during path building.
if (!InputsAreEqual(encodedIssuerName, cert.GetSubject())) {
continue;
}
// We assume that extra certificates (presumably from the TLS handshake)
// are intermediates, since sending trust anchors would be superfluous.
geckoIntermediateCandidates.AppendElement(
IssuerCandidateWithSource{certInput, IssuerSource::TLSHandshake});
}
}
for (const auto& thirdPartyRootInput : mThirdPartyRootInputs) {
BackCert root(thirdPartyRootInput, EndEntityOrCA::MustBeCA, nullptr);
Result rv = root.Init();
if (rv != Success) {
continue;
}
// Filter out 3rd party roots that can't be issuers we're looking for
// because the subject distinguished name doesn't match. This prevents
// mozilla::pkix from accumulating spurious errors during path building.
if (!InputsAreEqual(encodedIssuerName, root.GetSubject())) {
continue;
}
geckoRootCandidates.AppendElement(IssuerCandidateWithSource{
thirdPartyRootInput, IssuerSource::ThirdPartyCertificates});
}
for (const auto& thirdPartyIntermediateInput :
mThirdPartyIntermediateInputs) {
BackCert intermediate(thirdPartyIntermediateInput, EndEntityOrCA::MustBeCA,
nullptr);
Result rv = intermediate.Init();
if (rv != Success) {
continue;
}
// Filter out 3rd party intermediates that can't be issuers we're looking
// for because the subject distinguished name doesn't match. This prevents
// mozilla::pkix from accumulating spurious errors during path building.
if (!InputsAreEqual(encodedIssuerName, intermediate.GetSubject())) {
continue;
}
geckoIntermediateCandidates.AppendElement(IssuerCandidateWithSource{
thirdPartyIntermediateInput, IssuerSource::ThirdPartyCertificates});
}
if (!mCertStorage) {
return 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 Result::FATAL_ERROR_LIBRARY_FAILURE;
}
for (auto& cert : certs) {
Input certDER;
Result rv = certDER.Init(cert.Elements(), cert.Length());
if (rv != Success) {
continue; // probably too big
}
// Currently we're only expecting intermediate certificates in cert storage.
geckoIntermediateCandidates.AppendElement(IssuerCandidateWithSource{
std::move(certDER), IssuerSource::PreloadedIntermediates});
}
// Try all root certs first and then all (presumably) intermediates.
geckoRootCandidates.AppendElements(std::move(geckoIntermediateCandidates));
bool keepGoing = true;
Result result = CheckCandidates(checker, geckoRootCandidates,
nameConstraintsInputPtr, keepGoing);
if (result != Success) {
return result;
}
if (!keepGoing) {
return Success;
}
// Synchronously dispatch a task to the socket thread to find
// CERTCertificates with the given subject. This involves querying NSS
// structures and databases, so it should be done on the socket thread.
nsTArray<nsTArray<uint8_t>> nssRootCandidates;
nsTArray<nsTArray<uint8_t>> nssIntermediateCandidates;
RefPtr<Runnable> getCandidatesTask =
NS_NewRunnableFunction("NSSCertDBTrustDomain::FindIssuer", [&]() {
if (AppShutdown::IsInOrBeyond(ShutdownPhase::AppShutdownConfirmed)) {
return;
}
// 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));
if (candidates) {
for (CERTCertListNode* n = CERT_LIST_HEAD(candidates);
!CERT_LIST_END(n, candidates); n = CERT_LIST_NEXT(n)) {
nsTArray<uint8_t> candidate;
candidate.AppendElements(n->cert->derCert.data,
n->cert->derCert.len);
if (n->cert->isRoot) {
nssRootCandidates.AppendElement(std::move(candidate));
} else {
nssIntermediateCandidates.AppendElement(std::move(candidate));
}
}
}
});
nsCOMPtr<nsIEventTarget> socketThread(
do_GetService(NS_SOCKETTRANSPORTSERVICE_CONTRACTID));
if (!socketThread) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
rv = SyncRunnable::DispatchToThread(socketThread, getCandidatesTask);
if (NS_FAILED(rv)) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
nsTArray<IssuerCandidateWithSource> nssCandidates;
for (const auto& rootCandidate : nssRootCandidates) {
Input certDER;
Result rv = certDER.Init(rootCandidate.Elements(), rootCandidate.Length());
if (rv != Success) {
continue; // probably too big
}
nssCandidates.AppendElement(
IssuerCandidateWithSource{std::move(certDER), IssuerSource::NSSCertDB});
}
for (const auto& intermediateCandidate : nssIntermediateCandidates) {
Input certDER;
Result rv = certDER.Init(intermediateCandidate.Elements(),
intermediateCandidate.Length());
if (rv != Success) {
continue; // probably too big
}
nssCandidates.AppendElement(
IssuerCandidateWithSource{std::move(certDER), IssuerSource::NSSCertDB});
}
return CheckCandidates(checker, nssCandidates, nameConstraintsInputPtr,
keepGoing);
}
Result NSSCertDBTrustDomain::GetCertTrust(EndEntityOrCA endEntityOrCA,
const CertPolicyId& policy,
Input candidateCertDER,
/*out*/ TrustLevel& trustLevel) {
// Check the certificate against the OneCRL cert blocklist
if (!mCertStorage) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
// The certificate blocklist currently only applies to TLS server
// certificates.
if (mCertDBTrustType == trustSSL) {
int16_t revocationState;
nsTArray<uint8_t> issuerBytes;
nsTArray<uint8_t> serialBytes;
nsTArray<uint8_t> subjectBytes;
nsTArray<uint8_t> pubKeyBytes;
Result result =
BuildRevocationCheckArrays(candidateCertDER, endEntityOrCA, issuerBytes,
serialBytes, subjectBytes, pubKeyBytes);
if (result != Success) {
return result;
}
nsresult nsrv = mCertStorage->GetRevocationState(
issuerBytes, serialBytes, subjectBytes, pubKeyBytes, &revocationState);
if (NS_FAILED(nsrv)) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
if (revocationState == nsICertStorage::STATE_ENFORCE) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: certificate is in blocklist"));
Telemetry::AccumulateCategorical(
Telemetry::LABELS_CERT_REVOCATION_MECHANISMS::OneCRL);
return Result::ERROR_REVOKED_CERTIFICATE;
}
}
// This may be a third-party root.
for (const auto& thirdPartyRootInput : mThirdPartyRootInputs) {
if (InputsAreEqual(candidateCertDER, thirdPartyRootInput)) {
trustLevel = TrustLevel::TrustAnchor;
return Success;
}
}
// This may be a third-party intermediate.
for (const auto& thirdPartyIntermediateInput :
mThirdPartyIntermediateInputs) {
if (InputsAreEqual(candidateCertDER, thirdPartyIntermediateInput)) {
trustLevel = TrustLevel::InheritsTrust;
return Success;
}
}
// Synchronously dispatch a task to the socket thread to construct a
// CERTCertificate and get its trust from NSS. This involves querying NSS
// structures and databases, so it should be done on the socket thread.
Result result = Result::FATAL_ERROR_LIBRARY_FAILURE;
RefPtr<Runnable> getTrustTask =
NS_NewRunnableFunction("NSSCertDBTrustDomain::GetCertTrust", [&]() {
if (AppShutdown::IsInOrBeyond(ShutdownPhase::AppShutdownConfirmed)) {
result = Result::FATAL_ERROR_LIBRARY_FAILURE;
return;
}
// This would be cleaner and more efficient if we could get the trust
// information without constructing a CERTCertificate here, but NSS
// doesn't expose it in any other easy-to-use fashion. The use of
// CERT_NewTempCertificate to get a CERTCertificate shouldn't be a
// performance problem for certificates already known to NSS because NSS
// will just find the existing CERTCertificate in its in-memory cache
// and return it. For certificates not already in NSS (namely
// third-party roots and intermediates), we want to avoid calling
// CERT_NewTempCertificate repeatedly, so we've already checked if the
// candidate certificate is a third-party certificate, above.
SECItem candidateCertDERSECItem =
UnsafeMapInputToSECItem(candidateCertDER);
UniqueCERTCertificate candidateCert(CERT_NewTempCertificate(
CERT_GetDefaultCertDB(), &candidateCertDERSECItem, nullptr, false,
true));
if (!candidateCert) {
result = MapPRErrorCodeToResult(PR_GetError());
return;
}
// NB: CERT_GetCertTrust seems to be abusing SECStatus as a boolean,
// where SECSuccess means that there is a trust record and SECFailure
// means there is not a trust record. I looked at NSS's internal uses of
// CERT_GetCertTrust, and all that code uses the result as a boolean
// meaning "We have a trust record."
CERTCertTrust trust;
if (CERT_GetCertTrust(candidateCert.get(), &trust) == SECSuccess) {
uint32_t flags = SEC_GET_TRUST_FLAGS(&trust, mCertDBTrustType);
// For DISTRUST, we use the CERTDB_TRUSTED or CERTDB_TRUSTED_CA bit,
// because we can have active distrust for either type of cert. Note
// that CERTDB_TERMINAL_RECORD means "stop trying to inherit trust" so
// if the relevant trust bit isn't set then that means the cert must
// be considered distrusted.
uint32_t relevantTrustBit = endEntityOrCA == EndEntityOrCA::MustBeCA
? CERTDB_TRUSTED_CA
: CERTDB_TRUSTED;
if (((flags & (relevantTrustBit | CERTDB_TERMINAL_RECORD))) ==
CERTDB_TERMINAL_RECORD) {
trustLevel = TrustLevel::ActivelyDistrusted;
result = Success;
return;
}
// For TRUST, we use the CERTDB_TRUSTED_CA bit.
if (flags & CERTDB_TRUSTED_CA) {
if (policy.IsAnyPolicy()) {
trustLevel = TrustLevel::TrustAnchor;
result = Success;
return;
}
nsTArray<uint8_t> certBytes(candidateCert->derCert.data,
candidateCert->derCert.len);
if (CertIsAuthoritativeForEVPolicy(certBytes, policy)) {
trustLevel = TrustLevel::TrustAnchor;
result = Success;
return;
}
}
}
trustLevel = TrustLevel::InheritsTrust;
result = Success;
});
nsCOMPtr<nsIEventTarget> socketThread(
do_GetService(NS_SOCKETTRANSPORTSERVICE_CONTRACTID));
if (!socketThread) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
nsresult rv = SyncRunnable::DispatchToThread(socketThread, getTrustTask);
if (NS_FAILED(rv)) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
return result;
}
Result NSSCertDBTrustDomain::DigestBuf(Input item, DigestAlgorithm digestAlg,
/*out*/ uint8_t* digestBuf,
size_t digestBufLen) {
return DigestBufNSS(item, digestAlg, digestBuf, digestBufLen);
}
TimeDuration NSSCertDBTrustDomain::GetOCSPTimeout() const {
switch (mOCSPFetching) {
case NSSCertDBTrustDomain::FetchOCSPForDVSoftFail:
return mOCSPTimeoutSoft;
case NSSCertDBTrustDomain::FetchOCSPForEV:
case NSSCertDBTrustDomain::FetchOCSPForDVHardFail:
return mOCSPTimeoutHard;
// The rest of these are error cases. Assert in debug builds, but return
// the soft timeout value in release builds.
case NSSCertDBTrustDomain::NeverFetchOCSP:
case NSSCertDBTrustDomain::LocalOnlyOCSPForEV:
MOZ_ASSERT_UNREACHABLE("we should never see this OCSPFetching type here");
break;
}
MOZ_ASSERT_UNREACHABLE("we're not handling every OCSPFetching type");
return mOCSPTimeoutSoft;
}
// Copied and modified from CERT_GetOCSPAuthorityInfoAccessLocation and
// CERT_GetGeneralNameByType. Returns a non-Result::Success result on error,
// Success with result.IsVoid() == true when an OCSP URI was not found, and
// Success with result.IsVoid() == false when an OCSP URI was found.
static Result GetOCSPAuthorityInfoAccessLocation(const UniquePLArenaPool& arena,
Input aiaExtension,
/*out*/ nsCString& result) {
MOZ_ASSERT(arena.get());
if (!arena.get()) {
return Result::FATAL_ERROR_INVALID_ARGS;
}
result.Assign(VoidCString());
SECItem aiaExtensionSECItem = UnsafeMapInputToSECItem(aiaExtension);
CERTAuthInfoAccess** aia =
CERT_DecodeAuthInfoAccessExtension(arena.get(), &aiaExtensionSECItem);
if (!aia) {
return Result::ERROR_CERT_BAD_ACCESS_LOCATION;
}
for (size_t i = 0; aia[i]; ++i) {
if (SECOID_FindOIDTag(&aia[i]->method) == SEC_OID_PKIX_OCSP) {
// NSS chooses the **last** OCSP URL; we choose the **first**
CERTGeneralName* current = aia[i]->location;
if (!current) {
continue;
}
do {
if (current->type == certURI) {
const SECItem& location = current->name.other;
// (location.len + 1) must be small enough to fit into a uint32_t,
// but we limit it to a smaller bound to reduce OOM risk.
if (location.len > 1024 || memchr(location.data, 0, location.len)) {
// Reject embedded nulls. (NSS doesn't do this)
return Result::ERROR_CERT_BAD_ACCESS_LOCATION;
}
result.Assign(nsDependentCSubstring(
reinterpret_cast<const char*>(location.data), location.len));
return Success;
}
current = CERT_GetNextGeneralName(current);
} while (current != aia[i]->location);
}
}
return Success;
}
NS_IMPL_ISUPPORTS(CRLiteTimestamp, nsICRLiteTimestamp)
NS_IMETHODIMP
CRLiteTimestamp::GetLogID(nsTArray<uint8_t>& aLogID) {
aLogID.Clear();
aLogID.AppendElements(mLogID);
return NS_OK;
}
NS_IMETHODIMP
CRLiteTimestamp::GetTimestamp(uint64_t* aTimestamp) {
*aTimestamp = mTimestamp;
return NS_OK;
}
Result BuildCRLiteTimestampArray(
Input sctExtension,
/*out*/ nsTArray<RefPtr<nsICRLiteTimestamp>>& timestamps) {
Input sctList;
Result rv =
ExtractSignedCertificateTimestampListFromExtension(sctExtension, sctList);
if (rv != Success) {
return rv;
}
std::vector<SignedCertificateTimestamp> decodedSCTs;
size_t decodingErrors;
DecodeSCTs(sctList, decodedSCTs, decodingErrors);
Unused << decodingErrors;
for (const auto& sct : decodedSCTs) {
timestamps.AppendElement(new CRLiteTimestamp(sct));
}
return Success;
}
Result NSSCertDBTrustDomain::CheckCRLiteStash(
const nsTArray<uint8_t>& issuerSubjectPublicKeyInfoBytes,
const nsTArray<uint8_t>& serialNumberBytes) {
// This information is deterministic and has already been validated by our
// infrastructure (it comes from signed CRLs), so if the stash says a
// certificate is revoked, it is.
bool isRevokedByStash = false;
nsresult rv = mCertStorage->IsCertRevokedByStash(
issuerSubjectPublicKeyInfoBytes, serialNumberBytes, &isRevokedByStash);
if (NS_FAILED(rv)) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::CheckCRLiteStash: IsCertRevokedByStash "
"failed"));
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
if (isRevokedByStash) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::CheckCRLiteStash: IsCertRevokedByStash "
"returned true"));
return Result::ERROR_REVOKED_CERTIFICATE;
}
return Success;
}
Result NSSCertDBTrustDomain::CheckCRLite(
const nsTArray<uint8_t>& issuerBytes,
const nsTArray<uint8_t>& issuerSubjectPublicKeyInfoBytes,
const nsTArray<uint8_t>& serialNumberBytes,
const nsTArray<RefPtr<nsICRLiteTimestamp>>& timestamps,
/*out*/ bool& filterCoversCertificate) {
filterCoversCertificate = false;
int16_t crliteRevocationState;
nsresult rv = mCertStorage->GetCRLiteRevocationState(
issuerBytes, issuerSubjectPublicKeyInfoBytes, serialNumberBytes,
timestamps, &crliteRevocationState);
if (NS_FAILED(rv)) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::CheckCRLite: CRLite call failed"));
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::CheckCRLite: CRLite check returned "
"state=%hd",
crliteRevocationState));
switch (crliteRevocationState) {
case nsICertStorage::STATE_ENFORCE:
filterCoversCertificate = true;
return Result::ERROR_REVOKED_CERTIFICATE;
case nsICertStorage::STATE_UNSET:
filterCoversCertificate = true;
return Success;
case nsICertStorage::STATE_NOT_ENROLLED:
filterCoversCertificate = false;
return Success;
case nsICertStorage::STATE_NOT_COVERED:
filterCoversCertificate = false;
return Success;
case nsICertStorage::STATE_NO_FILTER:
filterCoversCertificate = false;
return Success;
default:
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::CheckCRLite: Unknown CRLite revocation "
"state"));
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
}
Result NSSCertDBTrustDomain::CheckRevocation(
EndEntityOrCA endEntityOrCA, const CertID& certID, Time time,
Duration validityDuration,
/*optional*/ const Input* stapledOCSPResponse,
/*optional*/ const Input* aiaExtension,
/*optional*/ const Input* sctExtension) {
// Actively distrusted certificates will have already been blocked by
// GetCertTrust.
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: Top of CheckRevocation\n"));
// None of the revocation methods in this function are consulted for CA
// certificates. Revocation for CAs is handled by GetCertTrust.
if (endEntityOrCA == EndEntityOrCA::MustBeCA) {
return Success;
}
// Look for an OCSP Authority Information Access URL. Our behavior in
// ConfirmRevocations mode depends on whether a synchronous OCSP
// request is possible.
nsCString aiaLocation(VoidCString());
if (aiaExtension) {
UniquePLArenaPool arena(PORT_NewArena(DER_DEFAULT_CHUNKSIZE));
if (!arena) {
return Result::FATAL_ERROR_NO_MEMORY;
}
Result rv =
GetOCSPAuthorityInfoAccessLocation(arena, *aiaExtension, aiaLocation);
if (rv != Success) {
return rv;
}
}
bool crliteCoversCertificate = false;
Result crliteResult = Success;
if (mCRLiteMode != CRLiteMode::Disabled && sctExtension) {
crliteResult =
CheckRevocationByCRLite(certID, *sctExtension, crliteCoversCertificate);
// If CheckCRLite returned an error other than "revoked certificate",
// propagate that error.
if (crliteResult != Success &&
crliteResult != Result::ERROR_REVOKED_CERTIFICATE) {
return crliteResult;
}
if (crliteCoversCertificate) {
Telemetry::AccumulateCategorical(
Telemetry::LABELS_CERT_REVOCATION_MECHANISMS::CRLite);
// If we don't return here we will consult OCSP.
// In Enforce CRLite mode we can return "Revoked" or "Not Revoked"
// without consulting OCSP.
if (mCRLiteMode == CRLiteMode::Enforce) {
return crliteResult;
}
// If we don't have a URL for an OCSP responder, then we can return any
// result ConfirmRevocations mode. Note that we might have a
// stapled or cached OCSP response which we ignore in this case.
if (mCRLiteMode == CRLiteMode::ConfirmRevocations &&
aiaLocation.IsVoid()) {
return crliteResult;
}
// In ConfirmRevocations mode we can return "Not Revoked"
// without consulting OCSP.
if (mCRLiteMode == CRLiteMode::ConfirmRevocations &&
crliteResult == Success) {
return Success;
}
}
}
bool ocspSoftFailure = false;
Result ocspResult = CheckRevocationByOCSP(
certID, time, validityDuration, aiaLocation, crliteCoversCertificate,
crliteResult, stapledOCSPResponse, ocspSoftFailure);
// In ConfirmRevocations mode we treat any OCSP failure as confirmation
// of a CRLite revoked result.
if (crliteCoversCertificate &&
crliteResult == Result::ERROR_REVOKED_CERTIFICATE &&
mCRLiteMode == CRLiteMode::ConfirmRevocations &&
(ocspResult != Success || ocspSoftFailure)) {
return Result::ERROR_REVOKED_CERTIFICATE;
}
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: end of CheckRevocation"));
return ocspResult;
}
Result NSSCertDBTrustDomain::CheckRevocationByCRLite(
const CertID& certID, const Input& sctExtension,
/*out*/ bool& crliteCoversCertificate) {
crliteCoversCertificate = false;
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::CheckRevocation: checking CRLite"));
nsTArray<uint8_t> issuerSubjectPublicKeyInfoBytes;
issuerSubjectPublicKeyInfoBytes.AppendElements(
certID.issuerSubjectPublicKeyInfo.UnsafeGetData(),
certID.issuerSubjectPublicKeyInfo.GetLength());
nsTArray<uint8_t> serialNumberBytes;
serialNumberBytes.AppendElements(certID.serialNumber.UnsafeGetData(),
certID.serialNumber.GetLength());
// The CRLite stash is essentially a subset of a collection of CRLs, so if
// it says a certificate is revoked, it is.
Result rv =
CheckCRLiteStash(issuerSubjectPublicKeyInfoBytes, serialNumberBytes);
if (rv != Success) {
crliteCoversCertificate = (rv == Result::ERROR_REVOKED_CERTIFICATE);
return rv;
}
nsTArray<uint8_t> issuerBytes;
issuerBytes.AppendElements(certID.issuer.UnsafeGetData(),
certID.issuer.GetLength());
nsTArray<RefPtr<nsICRLiteTimestamp>> timestamps;
rv = BuildCRLiteTimestampArray(sctExtension, timestamps);
if (rv != Success) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("decoding SCT extension failed - CRLite will be not be "
"consulted"));
return Success;
}
return CheckCRLite(issuerBytes, issuerSubjectPublicKeyInfoBytes,
serialNumberBytes, timestamps, crliteCoversCertificate);
}
Result NSSCertDBTrustDomain::CheckRevocationByOCSP(
const CertID& certID, Time time, Duration validityDuration,
const nsCString& aiaLocation, const bool crliteCoversCertificate,
const Result crliteResult,
/*optional*/ const Input* stapledOCSPResponse,
/*out*/ bool& softFailure) {
softFailure = false;
const uint16_t maxOCSPLifetimeInDays = 10;
// If we have a stapled OCSP response then the verification of that response
// determines the result unless the OCSP response is expired. We make an
// exception for expired responses because some servers, nginx in particular,
// are known to serve expired responses due to bugs.
// We keep track of the result of verifying the stapled response but don't
// immediately return failure if the response has expired.
Result stapledOCSPResponseResult = Success;
if (stapledOCSPResponse) {
bool expired;
stapledOCSPResponseResult = VerifyAndMaybeCacheEncodedOCSPResponse(
certID, time, maxOCSPLifetimeInDays, *stapledOCSPResponse,
ResponseWasStapled, expired);
Telemetry::AccumulateCategorical(
Telemetry::LABELS_CERT_REVOCATION_MECHANISMS::StapledOCSP);
if (stapledOCSPResponseResult == Success) {
// stapled OCSP response present and good
mOCSPStaplingStatus = CertVerifier::OCSP_STAPLING_GOOD;
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: stapled OCSP response: good"));
return Success;
}
if (stapledOCSPResponseResult == Result::ERROR_OCSP_OLD_RESPONSE ||
expired) {
// stapled OCSP response present but expired
mOCSPStaplingStatus = CertVerifier::OCSP_STAPLING_EXPIRED;
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: expired stapled OCSP response"));
} else if (stapledOCSPResponseResult ==
Result::ERROR_OCSP_TRY_SERVER_LATER ||
stapledOCSPResponseResult ==
Result::ERROR_OCSP_INVALID_SIGNING_CERT) {
// Stapled OCSP response present but invalid for a small number of reasons
// CAs/servers commonly get wrong. This will be treated similarly to an
// expired stapled response.
mOCSPStaplingStatus = CertVerifier::OCSP_STAPLING_INVALID;
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: stapled OCSP response: "
"failure (allowed for compatibility)"));
} else {
// stapled OCSP response present but invalid for some reason
mOCSPStaplingStatus = CertVerifier::OCSP_STAPLING_INVALID;
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: stapled OCSP response: failure"));
return stapledOCSPResponseResult;
}
} else {
// no stapled OCSP response
mOCSPStaplingStatus = CertVerifier::OCSP_STAPLING_NONE;
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: no stapled OCSP response"));
}
Result cachedResponseResult = Success;
Time cachedResponseValidThrough(Time::uninitialized);
bool cachedResponsePresent =
mOCSPCache.Get(certID, mOriginAttributes, cachedResponseResult,
cachedResponseValidThrough);
if (cachedResponsePresent) {
Telemetry::AccumulateCategorical(
Telemetry::LABELS_CERT_REVOCATION_MECHANISMS::CachedOCSP);
if (cachedResponseResult == Success && cachedResponseValidThrough >= time) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: cached OCSP response: good"));
return Success;
}
// If we have a cached revoked response, use it.
if (cachedResponseResult == Result::ERROR_REVOKED_CERTIFICATE) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: cached OCSP response: revoked"));
return Result::ERROR_REVOKED_CERTIFICATE;
}
// The cached response may indicate an unknown certificate or it may be
// expired. Don't return with either of these statuses yet - we may be
// able to fetch a more recent one.
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: cached OCSP response: error %d",
static_cast<int>(cachedResponseResult)));
// When a good cached response has expired, it is more convenient
// to convert that to an error code and just deal with
// cachedResponseResult from here on out.
if (cachedResponseResult == Success && cachedResponseValidThrough < time) {
cachedResponseResult = Result::ERROR_OCSP_OLD_RESPONSE;
}
// We may have a cached indication of server failure. Ignore it if
// it has expired.
if (cachedResponseResult != Success &&
cachedResponseResult != Result::ERROR_OCSP_UNKNOWN_CERT &&
cachedResponseResult != Result::ERROR_OCSP_OLD_RESPONSE &&
cachedResponseValidThrough < time) {
cachedResponseResult = Success;
cachedResponsePresent = false;
}
} else {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: no cached OCSP response"));
}
// At this point, if and only if cachedErrorResult is Success, there was no
// cached response.
MOZ_ASSERT((!cachedResponsePresent && cachedResponseResult == Success) ||
(cachedResponsePresent && cachedResponseResult != Success));
// TODO: We still need to handle the fallback for invalid stapled responses.
// But, if/when we disable OCSP fetching by default, it would be ambiguous
// whether security.OCSP.enable==0 means "I want the default" or "I really
// never want you to ever fetch OCSP."
// Additionally, this doesn't properly handle OCSP-must-staple when OCSP
// fetching is disabled.
Duration shortLifetime(mCertShortLifetimeInDays * Time::ONE_DAY_IN_SECONDS);
if (validityDuration < shortLifetime) {
Telemetry::AccumulateCategorical(
Telemetry::LABELS_CERT_REVOCATION_MECHANISMS::ShortValidity);
}
if ((mOCSPFetching == NeverFetchOCSP) || (validityDuration < shortLifetime)) {
// We're not going to be doing any fetching, so if there was a cached
// "unknown" response, say so.
if (cachedResponseResult == Result::ERROR_OCSP_UNKNOWN_CERT) {
return Result::ERROR_OCSP_UNKNOWN_CERT;
}
// If we're doing hard-fail, we want to know if we have a cached response
// that has expired.
if (mOCSPFetching == FetchOCSPForDVHardFail &&
cachedResponseResult == Result::ERROR_OCSP_OLD_RESPONSE) {
return Result::ERROR_OCSP_OLD_RESPONSE;
}
softFailure = true;
return Success;
}
if (mOCSPFetching == LocalOnlyOCSPForEV) {
if (cachedResponseResult != Success) {
return cachedResponseResult;
}
return Result::ERROR_OCSP_UNKNOWN_CERT;
}
if (aiaLocation.IsVoid()) {
if (mOCSPFetching == FetchOCSPForEV ||
cachedResponseResult == Result::ERROR_OCSP_UNKNOWN_CERT) {
return Result::ERROR_OCSP_UNKNOWN_CERT;
}
if (cachedResponseResult == Result::ERROR_OCSP_OLD_RESPONSE) {
return Result::ERROR_OCSP_OLD_RESPONSE;
}
if (stapledOCSPResponseResult != Success) {
return stapledOCSPResponseResult;
}
// Nothing to do if we don't have an OCSP responder URI for the cert; just
// assume it is good. Note that this is the confusing, but intended,
// interpretation of "strict" revocation checking in the face of a
// certificate that lacks an OCSP responder URI. There's no need to set
// softFailure here---we check for the presence of an AIA before attempting
// OCSP when CRLite is configured in confirm revocations mode.
return Success;
}
if (cachedResponseResult == Success ||
cachedResponseResult == Result::ERROR_OCSP_UNKNOWN_CERT ||
cachedResponseResult == Result::ERROR_OCSP_OLD_RESPONSE) {
// Only send a request to, and process a response from, the server if we
// didn't have a cached indication of failure. Also, don't keep requesting
// responses from a failing server.
return SynchronousCheckRevocationWithServer(
certID, aiaLocation, time, maxOCSPLifetimeInDays, cachedResponseResult,
stapledOCSPResponseResult, crliteCoversCertificate, crliteResult,
softFailure);
}
return HandleOCSPFailure(cachedResponseResult, stapledOCSPResponseResult,
cachedResponseResult, softFailure);
}
Result NSSCertDBTrustDomain::SynchronousCheckRevocationWithServer(
const CertID& certID, const nsCString& aiaLocation, Time time,
uint16_t maxOCSPLifetimeInDays, const Result cachedResponseResult,
const Result stapledOCSPResponseResult, const bool crliteCoversCertificate,
const Result crliteResult, /*out*/ bool& softFailure) {
if (AppShutdown::IsInOrBeyond(ShutdownPhase::AppShutdownConfirmed)) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
uint8_t ocspRequestBytes[OCSP_REQUEST_MAX_LENGTH];
size_t ocspRequestLength;
Result rv = CreateEncodedOCSPRequest(*this, certID, ocspRequestBytes,
ocspRequestLength);
if (rv != Success) {
return rv;
}
Vector<uint8_t> ocspResponse;
Input response;
mOCSPFetchStatus = OCSPFetchStatus::Fetched;
rv = DoOCSPRequest(aiaLocation, mOriginAttributes, ocspRequestBytes,
ocspRequestLength, GetOCSPTimeout(), ocspResponse);
Telemetry::AccumulateCategorical(
Telemetry::LABELS_CERT_REVOCATION_MECHANISMS::OCSP);
if (rv == Success &&
response.Init(ocspResponse.begin(), ocspResponse.length()) != Success) {
rv = Result::ERROR_OCSP_MALFORMED_RESPONSE; // too big
}
if (rv != Success) {
Time timeout(time);
if (timeout.AddSeconds(ServerFailureDelaySeconds) != Success) {
return Result::FATAL_ERROR_LIBRARY_FAILURE; // integer overflow
}
Result cacheRV =
mOCSPCache.Put(certID, mOriginAttributes, rv, time, timeout);
if (cacheRV != Success) {
return cacheRV;
}
if (crliteCoversCertificate) {
if (crliteResult == Success) {
// CRLite says the certificate is OK, but OCSP fetching failed.
Telemetry::AccumulateCategorical(
Telemetry::LABELS_CRLITE_VS_OCSP_RESULT::CRLiteOkOCSPFail);
} else {
// CRLite says the certificate is revoked, but OCSP fetching failed.
Telemetry::AccumulateCategorical(
Telemetry::LABELS_CRLITE_VS_OCSP_RESULT::CRLiteRevOCSPFail);
}
}
return HandleOCSPFailure(cachedResponseResult, stapledOCSPResponseResult,
rv, softFailure);
}
// If the response from the network has expired but indicates a revoked
// or unknown certificate, PR_GetError() will return the appropriate error.
// We actually ignore expired here.
bool expired;
rv = VerifyAndMaybeCacheEncodedOCSPResponse(certID, time,
maxOCSPLifetimeInDays, response,
ResponseIsFromNetwork, expired);
// If the CRLite filter covers the certificate, compare the CRLite result
// with the OCSP fetching result. OCSP may have succeeded, said the
// certificate is revoked, said the certificate doesn't exist, or it may have
// failed for a reason that results in a "soft fail" (i.e. there is no
// indication that the certificate is either definitely revoked or definitely
// not revoked, so for usability, revocation checking says the certificate is
// valid by default).
if (crliteCoversCertificate) {
if (rv == Success) {
if (crliteResult == Success) {
// CRLite and OCSP fetching agree the certificate is OK.
Telemetry::AccumulateCategorical(
Telemetry::LABELS_CRLITE_VS_OCSP_RESULT::CRLiteOkOCSPOk);
} else {
// CRLite says the certificate is revoked, but OCSP says it is OK.
Telemetry::AccumulateCategorical(
Telemetry::LABELS_CRLITE_VS_OCSP_RESULT::CRLiteRevOCSPOk);
}
} else if (rv == Result::ERROR_REVOKED_CERTIFICATE) {
if (crliteResult == Success) {
// CRLite says the certificate is OK, but OCSP says it is revoked.
Telemetry::AccumulateCategorical(
Telemetry::LABELS_CRLITE_VS_OCSP_RESULT::CRLiteOkOCSPRev);
} else {
// CRLite and OCSP fetching agree the certificate is revoked.
Telemetry::AccumulateCategorical(
Telemetry::LABELS_CRLITE_VS_OCSP_RESULT::CRLiteRevOCSPRev);
}
} else if (rv == Result::ERROR_OCSP_UNKNOWN_CERT) {
if (crliteResult == Success) {
// CRLite says the certificate is OK, but OCSP says it doesn't exist.
Telemetry::AccumulateCategorical(
Telemetry::LABELS_CRLITE_VS_OCSP_RESULT::CRLiteOkOCSPUnk);
} else {
// CRLite says the certificate is revoked, but OCSP says it doesn't
// exist.
Telemetry::AccumulateCategorical(
Telemetry::LABELS_CRLITE_VS_OCSP_RESULT::CRLiteRevOCSPUnk);
}
} else {
if (crliteResult == Success) {
// CRLite says the certificate is OK, but OCSP encountered a soft-fail
// error.
Telemetry::AccumulateCategorical(
Telemetry::LABELS_CRLITE_VS_OCSP_RESULT::CRLiteOkOCSPSoft);
} else {
// CRLite says the certificate is revoked, but OCSP encountered a
// soft-fail error.
Telemetry::AccumulateCategorical(
Telemetry::LABELS_CRLITE_VS_OCSP_RESULT::CRLiteRevOCSPSoft);
}
}
}
if (rv == Success || mOCSPFetching != FetchOCSPForDVSoftFail) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: returning after "
"VerifyEncodedOCSPResponse"));
return rv;
}
if (rv == Result::ERROR_OCSP_UNKNOWN_CERT ||
rv == Result::ERROR_REVOKED_CERTIFICATE) {
return rv;
}
if (stapledOCSPResponseResult != Success) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: returning SECFailure from expired/invalid "
"stapled response after OCSP request verification failure"));
return stapledOCSPResponseResult;
}
softFailure = true;
return Success; // Soft fail -> success :(
}
Result NSSCertDBTrustDomain::HandleOCSPFailure(
const Result cachedResponseResult, const Result stapledOCSPResponseResult,
const Result error, /*out*/ bool& softFailure) {
if (mOCSPFetching != FetchOCSPForDVSoftFail) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: returning SECFailure after OCSP request "
"failure"));
return error;
}
if (cachedResponseResult == Result::ERROR_OCSP_UNKNOWN_CERT) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: returning SECFailure from cached response "
"after OCSP request failure"));
return cachedResponseResult;
}
if (stapledOCSPResponseResult != Success) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: returning SECFailure from expired/invalid "
"stapled response after OCSP request failure"));
return stapledOCSPResponseResult;
}
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: returning SECSuccess after OCSP request "
"failure"));
softFailure = true;
return Success; // Soft fail -> success :(
}
Result NSSCertDBTrustDomain::VerifyAndMaybeCacheEncodedOCSPResponse(
const CertID& certID, Time time, uint16_t maxLifetimeInDays,
Input encodedResponse, EncodedResponseSource responseSource,
/*out*/ bool& expired) {
Time thisUpdate(Time::uninitialized);
Time validThrough(Time::uninitialized);
Result rv = VerifyEncodedOCSPResponse(*this, certID, time, maxLifetimeInDays,
encodedResponse, expired, &thisUpdate,
&validThrough);
// If a response was stapled and expired, we don't want to cache it. Return
// early to simplify the logic here.
if (responseSource == ResponseWasStapled && expired) {
MOZ_ASSERT(rv != Success);
return rv;
}
// validThrough is only trustworthy if the response successfully verifies
// or it indicates a revoked or unknown certificate.
// If this isn't the case, store an indication of failure (to prevent
// repeatedly requesting a response from a failing server).
if (rv != Success && rv != Result::ERROR_REVOKED_CERTIFICATE &&
rv != Result::ERROR_OCSP_UNKNOWN_CERT) {
validThrough = time;
if (validThrough.AddSeconds(ServerFailureDelaySeconds) != Success) {
return Result::FATAL_ERROR_LIBRARY_FAILURE; // integer overflow
}
}
if (responseSource == ResponseIsFromNetwork || rv == Success ||
rv == Result::ERROR_REVOKED_CERTIFICATE ||
rv == Result::ERROR_OCSP_UNKNOWN_CERT) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: caching OCSP response"));
Result putRV =
mOCSPCache.Put(certID, mOriginAttributes, rv, thisUpdate, validThrough);
if (putRV != Success) {
return putRV;
}
}
return rv;
}
SECStatus GetCertDistrustAfterValue(const SECItem* distrustItem,
PRTime& distrustTime) {
if (!distrustItem || !distrustItem->data || distrustItem->len != 13) {
PR_SetError(SEC_ERROR_INVALID_ARGS, 0);
return SECFailure;
}
return DER_DecodeTimeChoice(&distrustTime, distrustItem);
}
SECStatus GetCertNotBeforeValue(const CERTCertificate* cert,
PRTime& distrustTime) {
return DER_DecodeTimeChoice(&distrustTime, &cert->validity.notBefore);
}
nsresult isDistrustedCertificateChain(
const nsTArray<nsTArray<uint8_t>>& certArray,
const SECTrustType certDBTrustType, bool& isDistrusted) {
if (certArray.Length() == 0) {
return NS_ERROR_FAILURE;
}
// Set the default result to be distrusted.
isDistrusted = true;
// There is no distrust to set if the certDBTrustType is not SSL or Email.
if (certDBTrustType != trustSSL && certDBTrustType != trustEmail) {
isDistrusted = false;
return NS_OK;
}
SECStatus runnableRV = SECFailure;
RefPtr<Runnable> isDistrustedChainTask =
NS_NewRunnableFunction("isDistrustedCertificateChain", [&]() {
if (AppShutdown::IsInOrBeyond(ShutdownPhase::AppShutdownConfirmed)) {
runnableRV = SECFailure;
return;
}
// Allocate objects and retreive the root and end-entity certificates.
CERTCertDBHandle* certDB(CERT_GetDefaultCertDB());
const nsTArray<uint8_t>& certRootDER = certArray.LastElement();
SECItem certRootDERItem = {
siBuffer, const_cast<unsigned char*>(certRootDER.Elements()),
AssertedCast<unsigned int>(certRootDER.Length())};
UniqueCERTCertificate certRoot(CERT_NewTempCertificate(
certDB, &certRootDERItem, nullptr, false, true));
if (!certRoot) {
runnableRV = SECFailure;
return;
}
const nsTArray<uint8_t>& certLeafDER = certArray.ElementAt(0);
SECItem certLeafDERItem = {
siBuffer, const_cast<unsigned char*>(certLeafDER.Elements()),
AssertedCast<unsigned int>(certLeafDER.Length())};
UniqueCERTCertificate certLeaf(CERT_NewTempCertificate(
certDB, &certLeafDERItem, nullptr, false, true));
if (!certLeaf) {
runnableRV = SECFailure;
return;
}
// Set isDistrusted to false if there is no distrust for the root.
if (!certRoot->distrust) {
isDistrusted = false;
runnableRV = SECSuccess;
return;
}
// Create a pointer to refer to the selected distrust struct.
SECItem* distrustPtr = nullptr;
if (certDBTrustType == trustSSL) {
distrustPtr = &certRoot->distrust->serverDistrustAfter;
}
if (certDBTrustType == trustEmail) {
distrustPtr = &certRoot->distrust->emailDistrustAfter;
}
// Get validity for the current end-entity certificate
// and get the distrust field for the root certificate.
PRTime certRootDistrustAfter;
PRTime certLeafNotBefore;
runnableRV =
GetCertDistrustAfterValue(distrustPtr, certRootDistrustAfter);
if (runnableRV != SECSuccess) {
return;
}
runnableRV = GetCertNotBeforeValue(certLeaf.get(), certLeafNotBefore);
if (runnableRV != SECSuccess) {
return;
}
// Compare the validity of the end-entity certificate with
// the distrust value of the root.
if (certLeafNotBefore <= certRootDistrustAfter) {
isDistrusted = false;
}
runnableRV = SECSuccess;
});
nsCOMPtr<nsIEventTarget> socketThread(
do_GetService(NS_SOCKETTRANSPORTSERVICE_CONTRACTID));
if (!socketThread) {
return NS_ERROR_FAILURE;
}
nsresult rv =
SyncRunnable::DispatchToThread(socketThread, isDistrustedChainTask);
if (NS_FAILED(rv) || runnableRV != SECSuccess) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
Result NSSCertDBTrustDomain::IsChainValid(const DERArray& reversedDERArray,
Time time,
const CertPolicyId& requiredPolicy) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: IsChainValid"));
size_t numCerts = reversedDERArray.GetLength();
if (numCerts < 1) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
nsTArray<nsTArray<uint8_t>> certArray;
for (size_t i = numCerts; i > 0; --i) {
const Input* derInput = reversedDERArray.GetDER(i - 1);
certArray.EmplaceBack(derInput->UnsafeGetData(), derInput->GetLength());
}
const nsTArray<uint8_t>& rootBytes = certArray.LastElement();
Input rootInput;
Result rv = rootInput.Init(rootBytes.Elements(), rootBytes.Length());
if (rv != Success) {
return rv;
}
rv = IsCertBuiltInRoot(rootInput, mIsBuiltChainRootBuiltInRoot);
if (rv != Result::Success) {
return rv;
}
nsresult nsrv;
// If mHostname isn't set, we're not verifying in the context of a TLS
// handshake, so don't verify key pinning in those cases.
if (mHostname) {
nsTArray<Span<const uint8_t>> derCertSpanList;
for (const auto& certDER : certArray) {
derCertSpanList.EmplaceBack(certDER.Elements(), certDER.Length());
}
bool chainHasValidPins;
nsrv = PublicKeyPinningService::ChainHasValidPins(
derCertSpanList, mHostname, time, mIsBuiltChainRootBuiltInRoot,
chainHasValidPins, mPinningTelemetryInfo);
if (NS_FAILED(nsrv)) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
if (!chainHasValidPins) {
return Result::ERROR_KEY_PINNING_FAILURE;
}
}
// Check that the childs' certificate NotBefore date is anterior to
// the NotAfter value of the parent when the root is a builtin.
if (mIsBuiltChainRootBuiltInRoot) {
bool isDistrusted;
nsrv =
isDistrustedCertificateChain(certArray, mCertDBTrustType, isDistrusted);
if (NS_FAILED(nsrv)) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
if (isDistrusted) {
return Result::ERROR_UNTRUSTED_ISSUER;
}
}
// See bug 1434300. If the root is a Symantec root, see if we distrust this
// path. Since we already have the root available, we can check that cheaply
// here before proceeding with the rest of the algorithm.
// This algorithm only applies if we are verifying in the context of a TLS
// handshake. To determine this, we check mHostname: If it isn't set, this is
// not TLS, so don't run the algorithm.
const nsTArray<uint8_t>& rootCertDER = certArray.LastElement();
if (mHostname && CertDNIsInList(rootCertDER, RootSymantecDNs)) {
if (numCerts <= 1) {
// This chain is supposed to be complete, so this is an error.
return Result::ERROR_ADDITIONAL_POLICY_CONSTRAINT_FAILED;
}
nsTArray<Input> intCerts;
for (size_t i = 1; i < certArray.Length() - 1; ++i) {
const nsTArray<uint8_t>& certBytes = certArray.ElementAt(i);
Input certInput;
rv = certInput.Init(certBytes.Elements(), certBytes.Length());
if (rv != Success) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
intCerts.EmplaceBack(certInput);
}
bool isDistrusted = false;
nsrv = CheckForSymantecDistrust(intCerts, RootAppleAndGoogleSPKIs,
isDistrusted);
if (NS_FAILED(nsrv)) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
if (isDistrusted) {
mSawDistrustedCAByPolicyError = true;
return Result::ERROR_ADDITIONAL_POLICY_CONSTRAINT_FAILED;
}
}
mBuiltChain = std::move(certArray);
return Success;
}
Result NSSCertDBTrustDomain::CheckSignatureDigestAlgorithm(
DigestAlgorithm aAlg, EndEntityOrCA /*endEntityOrCA*/, Time /*notBefore*/) {
switch (aAlg) {
case DigestAlgorithm::sha256: // fall through
case DigestAlgorithm::sha384: // fall through
case DigestAlgorithm::sha512:
return Success;
case DigestAlgorithm::sha1:
return Result::ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED;
}
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
Result NSSCertDBTrustDomain::CheckRSAPublicKeyModulusSizeInBits(
EndEntityOrCA /*endEntityOrCA*/, unsigned int modulusSizeInBits) {
if (modulusSizeInBits < mMinRSABits) {
return Result::ERROR_INADEQUATE_KEY_SIZE;
}
return Success;
}
Result NSSCertDBTrustDomain::VerifyRSAPKCS1SignedData(
Input data, DigestAlgorithm digestAlgorithm, Input signature,
Input subjectPublicKeyInfo) {
return VerifyRSAPKCS1SignedDataNSS(data, digestAlgorithm, signature,
subjectPublicKeyInfo, mPinArg);
}
Result NSSCertDBTrustDomain::VerifyRSAPSSSignedData(
Input data, DigestAlgorithm digestAlgorithm, Input signature,
Input subjectPublicKeyInfo) {
return VerifyRSAPSSSignedDataNSS(data, digestAlgorithm, signature,
subjectPublicKeyInfo, mPinArg);
}
Result NSSCertDBTrustDomain::CheckECDSACurveIsAcceptable(
EndEntityOrCA /*endEntityOrCA*/, NamedCurve curve) {
switch (curve) {
case NamedCurve::secp256r1: // fall through
case NamedCurve::secp384r1: // fall through
case NamedCurve::secp521r1:
return Success;
}
return Result::ERROR_UNSUPPORTED_ELLIPTIC_CURVE;
}
Result NSSCertDBTrustDomain::VerifyECDSASignedData(
Input data, DigestAlgorithm digestAlgorithm, Input signature,
Input subjectPublicKeyInfo) {
return VerifyECDSASignedDataNSS(data, digestAlgorithm, signature,
subjectPublicKeyInfo, mPinArg);
}
Result NSSCertDBTrustDomain::CheckValidityIsAcceptable(
Time notBefore, Time notAfter, EndEntityOrCA endEntityOrCA,
KeyPurposeId keyPurpose) {
if (endEntityOrCA != EndEntityOrCA::MustBeEndEntity) {
return Success;
}
if (keyPurpose == KeyPurposeId::id_kp_OCSPSigning) {
return Success;
}
Duration DURATION_27_MONTHS_PLUS_SLOP((2 * 365 + 3 * 31 + 7) *
Time::ONE_DAY_IN_SECONDS);
Duration maxValidityDuration(UINT64_MAX);
Duration validityDuration(notBefore, notAfter);
switch (mValidityCheckingMode) {
case ValidityCheckingMode::CheckingOff:
return Success;
case ValidityCheckingMode::CheckForEV:
// The EV Guidelines say the maximum is 27 months, but we use a slightly
// higher limit here to (hopefully) minimize compatibility breakage.
maxValidityDuration = DURATION_27_MONTHS_PLUS_SLOP;
break;
default:
MOZ_ASSERT_UNREACHABLE(
"We're not handling every ValidityCheckingMode type");
}
if (validityDuration > maxValidityDuration) {
return Result::ERROR_VALIDITY_TOO_LONG;
}
return Success;
}
Result NSSCertDBTrustDomain::NetscapeStepUpMatchesServerAuth(
Time notBefore,
/*out*/ bool& matches) {
// (new Date("2015-08-23T00:00:00Z")).getTime() / 1000
static const Time AUGUST_23_2015 = TimeFromEpochInSeconds(1440288000);
// (new Date("2016-08-23T00:00:00Z")).getTime() / 1000
static const Time AUGUST_23_2016 = TimeFromEpochInSeconds(1471910400);
switch (mNetscapeStepUpPolicy) {
case NetscapeStepUpPolicy::AlwaysMatch:
matches = true;
return Success;
case NetscapeStepUpPolicy::MatchBefore23August2016:
matches = notBefore < AUGUST_23_2016;
return Success;
case NetscapeStepUpPolicy::MatchBefore23August2015:
matches = notBefore < AUGUST_23_2015;
return Success;
case NetscapeStepUpPolicy::NeverMatch:
matches = false;
return Success;
default:
MOZ_ASSERT_UNREACHABLE("unhandled NetscapeStepUpPolicy type");
}
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
void NSSCertDBTrustDomain::ResetAccumulatedState() {
mOCSPStaplingStatus = CertVerifier::OCSP_STAPLING_NEVER_CHECKED;
mSCTListFromOCSPStapling = nullptr;
mSCTListFromCertificate = nullptr;
mSawDistrustedCAByPolicyError = false;
mIsBuiltChainRootBuiltInRoot = false;
mIssuerSources.clear();
}
static Input SECItemToInput(const UniqueSECItem& item) {
Input result;
if (item) {
MOZ_ASSERT(item->type == siBuffer);
Result rv = result.Init(item->data, item->len);
// As used here, |item| originally comes from an Input,
// so there should be no issues converting it back.
MOZ_ASSERT(rv == Success);
Unused << rv; // suppresses warnings in release builds
}
return result;
}
Input NSSCertDBTrustDomain::GetSCTListFromCertificate() const {
return SECItemToInput(mSCTListFromCertificate);
}
Input NSSCertDBTrustDomain::GetSCTListFromOCSPStapling() const {
return SECItemToInput(mSCTListFromOCSPStapling);
}
bool NSSCertDBTrustDomain::GetIsBuiltChainRootBuiltInRoot() const {
return mIsBuiltChainRootBuiltInRoot;
}
bool NSSCertDBTrustDomain::GetIsErrorDueToDistrustedCAPolicy() const {
return mSawDistrustedCAByPolicyError;
}
void NSSCertDBTrustDomain::NoteAuxiliaryExtension(AuxiliaryExtension extension,
Input extensionData) {
UniqueSECItem* out = nullptr;
switch (extension) {
case AuxiliaryExtension::EmbeddedSCTList:
out = &mSCTListFromCertificate;
break;
case AuxiliaryExtension::SCTListFromOCSPResponse:
out = &mSCTListFromOCSPStapling;
break;
default:
MOZ_ASSERT_UNREACHABLE("unhandled AuxiliaryExtension");
}
if (out) {
SECItem extensionDataItem = UnsafeMapInputToSECItem(extensionData);
out->reset(SECITEM_DupItem(&extensionDataItem));
}
}
SECStatus InitializeNSS(const nsACString& dir, NSSDBConfig nssDbConfig,
PKCS11DBConfig pkcs11DbConfig) {
MOZ_ASSERT(NS_IsMainThread());
// The NSS_INIT_NOROOTINIT flag turns off the loading of the root certs
// module by NSS_Initialize because we will load it in LoadLoadableRoots
// later. It also allows us to work around a bug in the system NSS in
// Ubuntu 8.04, which loads any nonexistent "<configdir>/libnssckbi.so" as
// "/usr/lib/nss/libnssckbi.so".
uint32_t flags = NSS_INIT_NOROOTINIT | NSS_INIT_OPTIMIZESPACE;
if (nssDbConfig == NSSDBConfig::ReadOnly) {
flags |= NSS_INIT_READONLY;
}
if (pkcs11DbConfig == PKCS11DBConfig::DoNotLoadModules) {
flags |= NSS_INIT_NOMODDB;
}
nsAutoCString dbTypeAndDirectory("sql:");
dbTypeAndDirectory.Append(dir);
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("InitializeNSS(%s, %d, %d)", dbTypeAndDirectory.get(),
(int)nssDbConfig, (int)pkcs11DbConfig));
SECStatus srv =
NSS_Initialize(dbTypeAndDirectory.get(), "", "", SECMOD_DB, flags);
if (srv != SECSuccess) {
return srv;
}
if (nssDbConfig == NSSDBConfig::ReadWrite) {
UniquePK11SlotInfo slot(PK11_GetInternalKeySlot());
if (!slot) {
return SECFailure;
}
// If the key DB doesn't have a password set, PK11_NeedUserInit will return
// true. For the SQL DB, we need to set a password or we won't be able to
// import any certificates or change trust settings.
if (PK11_NeedUserInit(slot.get())) {
srv = PK11_InitPin(slot.get(), nullptr, nullptr);
MOZ_ASSERT(srv == SECSuccess);
Unused << srv;
}
}
return SECSuccess;
}
void DisableMD5() {
NSS_SetAlgorithmPolicy(
SEC_OID_MD5, 0,
NSS_USE_ALG_IN_CERT_SIGNATURE | NSS_USE_ALG_IN_CMS_SIGNATURE);
NSS_SetAlgorithmPolicy(
SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION, 0,
NSS_USE_ALG_IN_CERT_SIGNATURE | NSS_USE_ALG_IN_CMS_SIGNATURE);
NSS_SetAlgorithmPolicy(
SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC, 0,
NSS_USE_ALG_IN_CERT_SIGNATURE | NSS_USE_ALG_IN_CMS_SIGNATURE);
}
// Load a given PKCS#11 module located in the given directory. It will be named
// the given module name. Optionally pass some string parameters to it via
// 'params'. This argument will be provided to C_Initialize when called on the
// module.
// |libraryName| and |dir| are encoded in UTF-8.
bool LoadUserModuleAt(const char* moduleName, const char* libraryName,
const nsCString& dir, /* optional */ const char* params) {
// If a module exists with the same name, make a best effort attempt to delete
// it. Note that it isn't possible to delete the internal module, so checking
// the return value would be detrimental in that case.
int unusedModType;
Unused << SECMOD_DeleteModule(moduleName, &unusedModType);
nsAutoCString fullLibraryPath;
if (!dir.IsEmpty()) {
fullLibraryPath.Assign(dir);
fullLibraryPath.AppendLiteral(FILE_PATH_SEPARATOR);
}
fullLibraryPath.Append(MOZ_DLL_PREFIX);
fullLibraryPath.Append(libraryName);
fullLibraryPath.Append(MOZ_DLL_SUFFIX);
// Escape the \ and " characters.
fullLibraryPath.ReplaceSubstring("\\", "\\\\");
fullLibraryPath.ReplaceSubstring("\"", "\\\"");
nsAutoCString pkcs11ModuleSpec("name=\"");
pkcs11ModuleSpec.Append(moduleName);
pkcs11ModuleSpec.AppendLiteral("\" library=\"");
pkcs11ModuleSpec.Append(fullLibraryPath);
pkcs11ModuleSpec.AppendLiteral("\"");
if (params) {
pkcs11ModuleSpec.AppendLiteral("\" parameters=\"");
pkcs11ModuleSpec.Append(params);
pkcs11ModuleSpec.AppendLiteral("\"");
}
UniqueSECMODModule userModule(SECMOD_LoadUserModule(
const_cast<char*>(pkcs11ModuleSpec.get()), nullptr, false));
if (!userModule) {
return false;
}
if (!userModule->loaded) {
return false;
}
return true;
}
const char* kIPCClientCertsModuleName = "IPC Client Cert Module";
bool LoadIPCClientCertsModule(const nsCString& dir) {
// The IPC client certs module needs to be able to call back into gecko to be
// able to communicate with the parent process over IPC. This is achieved by
// serializing the addresses of the relevant functions and passing them as an
// extra string parameter that will be available when C_Initialize is called
// on IPC client certs.
nsPrintfCString addrs("%p,%p", DoFindObjects, DoSign);
if (!LoadUserModuleAt(kIPCClientCertsModuleName, "ipcclientcerts", dir,
addrs.get())) {
return false;
}
RunOnShutdown(
[]() {
UniqueSECMODModule ipcClientCertsModule(
SECMOD_FindModule(kIPCClientCertsModuleName));
if (ipcClientCertsModule) {
SECMOD_UnloadUserModule(ipcClientCertsModule.get());
}
},
ShutdownPhase::XPCOMWillShutdown);
return true;
}
const char* kOSClientCertsModuleName = "OS Client Cert Module";
bool LoadOSClientCertsModule(const nsCString& dir) {
nsLiteralCString params =
StaticPrefs::security_osclientcerts_assume_rsa_pss_support()
? "RSA-PSS"_ns
: ""_ns;
return LoadUserModuleAt(kOSClientCertsModuleName, "osclientcerts", dir,
params.get());
}
bool LoadLoadableRoots(const nsCString& dir) {
// Some NSS command-line utilities will load a roots module under the name
// "Root Certs" if there happens to be a `MOZ_DLL_PREFIX "nssckbi"
// MOZ_DLL_SUFFIX` file in the directory being operated on. In some cases this
// can cause us to fail to load our roots module. In these cases, deleting the
// "Root Certs" module allows us to load the correct one. See bug 1406396.
int unusedModType;
Unused << SECMOD_DeleteModule("Root Certs", &unusedModType);
return LoadUserModuleAt(kRootModuleName, "nssckbi", dir, nullptr);
}
nsresult DefaultServerNicknameForCert(const CERTCertificate* cert,
/*out*/ nsCString& nickname) {
MOZ_ASSERT(cert);
NS_ENSURE_ARG_POINTER(cert);
UniquePORTString baseName(CERT_GetCommonName(&cert->subject));
if (!baseName) {
baseName = UniquePORTString(CERT_GetOrgUnitName(&cert->subject));
}
if (!baseName) {
baseName = UniquePORTString(CERT_GetOrgName(&cert->subject));
}
if (!baseName) {
baseName = UniquePORTString(CERT_GetLocalityName(&cert->subject));
}
if (!baseName) {
baseName = UniquePORTString(CERT_GetStateName(&cert->subject));
}
if (!baseName) {
baseName = UniquePORTString(CERT_GetCountryName(&cert->subject));
}
if (!baseName) {
return NS_ERROR_FAILURE;
}
// This function is only used in contexts where a failure to find a suitable
// nickname does not block the overall task from succeeding.
// As such, we use an arbitrary limit to prevent this nickname searching
// process from taking forever.
static const uint32_t ARBITRARY_LIMIT = 500;
for (uint32_t count = 1; count < ARBITRARY_LIMIT; count++) {
nickname = baseName.get();
if (count != 1) {
nickname.AppendPrintf(" #%u", count);
}
if (nickname.IsEmpty()) {
return NS_ERROR_FAILURE;
}
bool conflict = SEC_CertNicknameConflict(nickname.get(), &cert->derSubject,
cert->dbhandle);
if (!conflict) {
return NS_OK;
}
}
return NS_ERROR_FAILURE;
}
Result BuildRevocationCheckArrays(Input certDER, EndEntityOrCA endEntityOrCA,
/*out*/ nsTArray<uint8_t>& issuerBytes,
/*out*/ nsTArray<uint8_t>& serialBytes,
/*out*/ nsTArray<uint8_t>& subjectBytes,
/*out*/ nsTArray<uint8_t>& pubKeyBytes) {
BackCert cert(certDER, endEntityOrCA, nullptr);
Result rv = cert.Init();
if (rv != Success) {
return rv;
}
issuerBytes.Clear();
Input issuer(cert.GetIssuer());
issuerBytes.AppendElements(issuer.UnsafeGetData(), issuer.GetLength());
serialBytes.Clear();
Input serial(cert.GetSerialNumber());
serialBytes.AppendElements(serial.UnsafeGetData(), serial.GetLength());
subjectBytes.Clear();
Input subject(cert.GetSubject());
subjectBytes.AppendElements(subject.UnsafeGetData(), subject.GetLength());
pubKeyBytes.Clear();
Input pubKey(cert.GetSubjectPublicKeyInfo());
pubKeyBytes.AppendElements(pubKey.UnsafeGetData(), pubKey.GetLength());
return Success;
}
bool CertIsInCertStorage(const nsTArray<uint8_t>& certDER,
nsICertStorage* certStorage) {
MOZ_ASSERT(certStorage);
if (!certStorage) {
return false;
}
Input certInput;
Result rv = certInput.Init(certDER.Elements(), certDER.Length());
if (rv != Success) {
return false;
}
BackCert cert(certInput, EndEntityOrCA::MustBeCA, nullptr);
rv = cert.Init();
if (rv != Success) {
return false;
}
nsTArray<uint8_t> subject;
subject.AppendElements(cert.GetSubject().UnsafeGetData(),
cert.GetSubject().GetLength());
nsTArray<nsTArray<uint8_t>> certStorageCerts;
if (NS_FAILED(certStorage->FindCertsBySubject(subject, certStorageCerts))) {
return false;
}
for (const auto& certStorageCert : certStorageCerts) {
if (certStorageCert.Length() != certDER.Length()) {
continue;
}
if (memcmp(certStorageCert.Elements(), certDER.Elements(),
certStorageCert.Length()) == 0) {
return true;
}
}
return false;
}
/**
* Given a list of certificates representing a verified certificate path from an
* end-entity certificate to a trust anchor, imports the intermediate
* certificates into the permanent certificate database. This is an attempt to
* cope with misconfigured servers that don't include the appropriate
* intermediate certificates in the TLS handshake.
*
* @param certList the verified certificate list
*/
void SaveIntermediateCerts(const nsTArray<nsTArray<uint8_t>>& certList) {
if (certList.IsEmpty()) {
return;
}
nsTArray<nsTArray<uint8_t>> intermediates;
// Skip the end-entity; we only want to store intermediates. Similarly,
// there's no need to save the trust anchor - it's either already a permanent
// certificate or it's the Microsoft Family Safety root or an enterprise root
// temporarily imported via the child mode or enterprise root features. We
// don't want to import these because they're intended to be temporary (and
// because importing them happens to reset their trust settings, which breaks
// these features).
for (size_t index = 1; index < certList.Length() - 1; index++) {
intermediates.AppendElement(certList.ElementAt(index).Clone());
}
nsCOMPtr<nsIRunnable> importCertsRunnable(NS_NewRunnableFunction(
"IdleSaveIntermediateCerts",
[intermediates = std::move(intermediates)]() -> void {
if (AppShutdown::IsInOrBeyond(ShutdownPhase::AppShutdownConfirmed)) {
return;
}
UniquePK11SlotInfo slot(PK11_GetInternalKeySlot());
if (!slot) {
return;
}
size_t numCertsImported = 0;
nsCOMPtr<nsICertStorage> certStorage(
do_GetService(NS_CERT_STORAGE_CID));
for (const auto& certDER : intermediates) {
if (AppShutdown::IsInOrBeyond(ShutdownPhase::AppShutdownConfirmed)) {
return;
}
if (CertIsInCertStorage(certDER, certStorage)) {
continue;
}
SECItem certDERItem = {siBuffer,
const_cast<unsigned char*>(certDER.Elements()),
AssertedCast<unsigned int>(certDER.Length())};
UniqueCERTCertificate cert(CERT_NewTempCertificate(
CERT_GetDefaultCertDB(), &certDERItem, nullptr, false, true));
if (!cert) {
continue;
}
if (cert->slot) {
// This cert was found on a token; no need to remember it in the
// permanent database.
continue;
}
PRBool isperm;
if (CERT_GetCertIsPerm(cert.get(), &isperm) != SECSuccess) {
continue;
}
if (isperm) {
// We don't need to remember certs already stored in perm db.
continue;
}
// This is a best-effort attempt at avoiding unknown issuer errors
// in the future, so ignore failures here.
nsAutoCString nickname;
if (NS_FAILED(DefaultServerNicknameForCert(cert.get(), nickname))) {
continue;
}
Unused << PK11_ImportCert(slot.get(), cert.get(), CK_INVALID_HANDLE,
nickname.get(), false);
numCertsImported++;
}
nsCOMPtr<nsIRunnable> runnable(NS_NewRunnableFunction(
"IdleSaveIntermediateCertsDone", [numCertsImported]() -> void {
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
NS_ConvertUTF8toUTF16 numCertsImportedString(
nsPrintfCString("%zu", numCertsImported));
observerService->NotifyObservers(
nullptr, "psm:intermediate-certs-cached",
numCertsImportedString.get());
}
}));
Unused << NS_DispatchToMainThread(runnable.forget());
}));
Unused << NS_DispatchToCurrentThreadQueue(importCertsRunnable.forget(),
EventQueuePriority::Idle);
}
} // namespace psm
} // namespace mozilla
Reference in New Issue View Git Blame Copy Permalink