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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "NSSCertDBTrustDomain.h"
#include <stdint.h>
#include <utility>
#include "ExtendedValidation.h"
#include "MultiLogCTVerifier.h"
#include "NSSErrorsService.h"
#include "OCSPVerificationTrustDomain.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/PodOperations.h"
#include "mozilla/Services.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 "nsNSSCertHelper.h"
#include "nsNSSCertificate.h"
#include "nsNSSCertificateDB.h"
#include "nsNetCID.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"
#ifdef MOZ_WIDGET_COCOA
# include "nsCocoaFeatures.h"
#endif
#include "TrustOverrideUtils.h"
#include "TrustOverride-AppleGoogleDigiCertData.inc"
#include "TrustOverride-StartComAndWoSignData.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,
CertVerifier::PinningMode pinningMode, unsigned int minRSABits,
ValidityCheckingMode validityCheckingMode, CertVerifier::SHA1Mode sha1Mode,
NetscapeStepUpPolicy netscapeStepUpPolicy, CRLiteMode crliteMode,
uint64_t crliteCTMergeDelaySeconds,
const OriginAttributes& originAttributes,
const Vector<Input>& thirdPartyRootInputs,
const Vector<Input>& thirdPartyIntermediateInputs,
const Maybe<nsTArray<nsTArray<uint8_t>>>& extraCertificates,
/*out*/ UniqueCERTCertList& builtChain,
/*optional*/ PinningTelemetryInfo* pinningTelemetryInfo,
/*optional*/ CRLiteLookupResult* crliteLookupResult,
/*optional*/ const char* hostname)
: mCertDBTrustType(certDBTrustType),
mOCSPFetching(ocspFetching),
mOCSPCache(ocspCache),
mPinArg(pinArg),
mOCSPTimeoutSoft(ocspTimeoutSoft),
mOCSPTimeoutHard(ocspTimeoutHard),
mCertShortLifetimeInDays(certShortLifetimeInDays),
mPinningMode(pinningMode),
mMinRSABits(minRSABits),
mValidityCheckingMode(validityCheckingMode),
mSHA1Mode(sha1Mode),
mNetscapeStepUpPolicy(netscapeStepUpPolicy),
mCRLiteMode(crliteMode),
mCRLiteCTMergeDelaySeconds(crliteCTMergeDelaySeconds),
mSawDistrustedCAByPolicyError(false),
mOriginAttributes(originAttributes),
mThirdPartyRootInputs(thirdPartyRootInputs),
mThirdPartyIntermediateInputs(thirdPartyIntermediateInputs),
mExtraCertificates(extraCertificates),
mBuiltChain(builtChain),
mPinningTelemetryInfo(pinningTelemetryInfo),
mCRLiteLookupResult(crliteLookupResult),
mHostname(hostname),
mCertStorage(do_GetService(NS_CERT_STORAGE_CID)),
mOCSPStaplingStatus(CertVerifier::OCSP_STAPLING_NEVER_CHECKED),
mSCTListFromCertificate(),
mSCTListFromOCSPStapling(),
mBuiltInRootsModule(SECMOD_FindModule(kRootModuleName)) {}
static Result FindRootsWithSubject(UniqueSECMODModule& rootsModule,
SECItem subject,
/*out*/ nsTArray<nsTArray<uint8_t>>& roots) {
MOZ_ASSERT(rootsModule);
for (int slotIndex = 0; slotIndex < rootsModule->slotCount; slotIndex++) {
CERTCertificateList* rawResults = nullptr;
if (PK11_FindRawCertsWithSubject(rootsModule->slots[slotIndex], &subject,
&rawResults) != SECSuccess) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
// 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));
}
}
return Success;
}
// 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).
static bool ShouldSkipSelfSignedNonTrustAnchor(TrustDomain& trustDomain,
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 (trustDomain.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;
}
uint8_t digestBuf[MAX_DIGEST_SIZE_IN_BYTES];
pkix::der::PublicKeyAlgorithm publicKeyAlg;
SignedDigest signature;
if (DigestSignedData(trustDomain, cert.GetSignedData(), digestBuf,
publicKeyAlg, signature) != Success) {
return false;
}
if (VerifySignedDigest(trustDomain, publicKeyAlg, signature,
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;
}
static Result CheckCandidates(TrustDomain& trustDomain,
TrustDomain::IssuerChecker& checker,
nsTArray<Input>& candidates,
Input* nameConstraintsInputPtr, bool& keepGoing) {
for (Input candidate : candidates) {
if (ShouldSkipSelfSignedNonTrustAnchor(trustDomain, candidate)) {
continue;
}
Result rv = checker.Check(candidate, nameConstraintsInputPtr, keepGoing);
if (rv != Success) {
return rv;
}
if (!keepGoing) {
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<Input> geckoRootCandidates;
nsTArray<Input> geckoIntermediateCandidates;
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(std::move(certDER));
}
// 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) {
Result rv = FindRootsWithSubject(mBuiltInRootsModule, encodedIssuerNameItem,
builtInRoots);
if (rv != Success) {
return rv;
}
for (const auto& root : builtInRoots) {
Input rootInput;
rv = rootInput.Init(root.Elements(), root.Length());
if (rv != Success) {
continue; // probably too big
}
geckoRootCandidates.AppendElement(rootInput);
}
} else {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::FindIssuer: no built-in roots module"));
}
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(thirdPartyRootInput);
}
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(thirdPartyIntermediateInput);
}
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(certInput);
}
}
// Try all root certs first and then all (presumably) intermediates.
geckoRootCandidates.AppendElements(std::move(geckoIntermediateCandidates));
bool keepGoing = true;
Result result = CheckCandidates(*this, 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 must be done on the socket thread.
nsTArray<nsTArray<uint8_t>> nssRootCandidates;
nsTArray<nsTArray<uint8_t>> nssIntermediateCandidates;
RefPtr<Runnable> getCandidatesTask =
NS_NewRunnableFunction("NSSCertDBTrustDomain::FindIssuer", [&]() {
// 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<Input> 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(std::move(certDER));
}
for (const auto& intermediateCandidate : nssIntermediateCandidates) {
Input certDER;
Result rv = certDER.Init(intermediateCandidate.Elements(),
intermediateCandidate.Length());
if (rv != Success) {
continue; // probably too big
}
nssCandidates.AppendElement(std::move(certDER));
}
return CheckCandidates(*this, 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"));
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 must be done on the socket thread.
Result result = Result::FATAL_ERROR_LIBRARY_FAILURE;
RefPtr<Runnable> getTrustTask =
NS_NewRunnableFunction("NSSCertDBTrustDomain::GetCertTrust", [&]() {
// 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;
}
if (CertIsAuthoritativeForEVPolicy(candidateCert, 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;
}
Result GetEarliestSCTTimestamp(Input sctExtension,
Maybe<uint64_t>& earliestTimestamp) {
earliestTimestamp.reset();
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& scts : decodedSCTs) {
if (!earliestTimestamp.isSome() || scts.timestamp < *earliestTimestamp) {
earliestTimestamp = Some(scts.timestamp);
}
}
return Success;
}
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.
// TODO: need to verify that IsRevoked isn't called for trust anchors AND
// that that fact is documented in mozillapkix.
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: Top of CheckRevocation\n"));
Maybe<uint64_t> earliestSCTTimestamp = Nothing();
if (sctExtension) {
Result rv = GetEarliestSCTTimestamp(*sctExtension, earliestSCTTimestamp);
if (rv != Success) {
MOZ_LOG(
gCertVerifierLog, LogLevel::Debug,
("decoding SCT extension failed - CRLite will be not be consulted"));
}
}
if (endEntityOrCA == EndEntityOrCA::MustBeEndEntity &&
mCRLiteMode != CRLiteMode::Disabled && earliestSCTTimestamp.isSome()) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::CheckRevocation: checking CRLite"));
nsTArray<uint8_t> issuerBytes;
issuerBytes.AppendElements(certID.issuer.UnsafeGetData(),
certID.issuer.GetLength());
nsTArray<uint8_t> issuerSubjectPublicKeyInfoBytes;
issuerSubjectPublicKeyInfoBytes.AppendElements(
certID.issuerSubjectPublicKeyInfo.UnsafeGetData(),
certID.issuerSubjectPublicKeyInfo.GetLength());
nsTArray<uint8_t> serialNumberBytes;
serialNumberBytes.AppendElements(certID.serialNumber.UnsafeGetData(),
certID.serialNumber.GetLength());
uint64_t filterTimestamp;
int16_t crliteRevocationState;
nsresult rv = mCertStorage->GetCRLiteRevocationState(
issuerBytes, issuerSubjectPublicKeyInfoBytes, serialNumberBytes,
&filterTimestamp, &crliteRevocationState);
bool certificateFoundValidInCRLiteFilter = false;
if (NS_FAILED(rv)) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::CheckRevocation: CRLite call failed"));
if (mCRLiteLookupResult) {
*mCRLiteLookupResult = CRLiteLookupResult::LibraryFailure;
}
if (mCRLiteMode == CRLiteMode::Enforce) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
} else {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::CheckRevocation: CRLite check returned "
"state=%hd filter timestamp=%llu",
crliteRevocationState,
// The cast is to silence warnings on compilers where uint64_t is
// an unsigned long as opposed to an unsigned long long.
static_cast<unsigned long long>(filterTimestamp)));
Time filterTimestampTime(TimeFromEpochInSeconds(filterTimestamp));
// We can only use this result if the earliest embedded signed
// certificate timestamp from the certificate is older than what cert
// storage returned for its CRLite timestamp. Otherwise, the CRLite
// filter cascade may have been created before this certificate existed,
// and if it would create a false positive, it hasn't been accounted for.
// SCT timestamps are milliseconds since the epoch.
Time earliestCertificateTimestamp(
TimeFromEpochInSeconds(*earliestSCTTimestamp / 1000));
Result result =
earliestCertificateTimestamp.AddSeconds(mCRLiteCTMergeDelaySeconds);
if (result != Success) {
// This shouldn't happen - the merge delay is at most a year in seconds,
// and the SCT timestamp is supposed to be in the past.
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::CheckRevocation: integer overflow "
"calculating sct timestamp + merge delay (%llu + %llu)",
static_cast<unsigned long long>(*earliestSCTTimestamp / 1000),
static_cast<unsigned long long>(mCRLiteCTMergeDelaySeconds)));
if (mCRLiteMode == CRLiteMode::Enforce) {
// While we do have control over the possible values of the CT merge
// delay parameter, we don't have control over the SCT timestamp.
// Thus, if we've reached this point, the CA has probably made a
// mistake and we should treat this certificate as revoked.
return Result::ERROR_REVOKED_CERTIFICATE;
}
// If Time::AddSeconds fails, the original value is unchanged. Since in
// this case `earliestCertificateTimestamp` must represent a value far
// in the future, any CRLite result will be discarded.
}
if (earliestCertificateTimestamp <= filterTimestampTime &&
crliteRevocationState == nsICertStorage::STATE_ENFORCE) {
if (mCRLiteLookupResult) {
*mCRLiteLookupResult = CRLiteLookupResult::CertificateRevoked;
}
if (mCRLiteMode == CRLiteMode::Enforce) {
MOZ_LOG(
gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::CheckRevocation: certificate revoked via "
"CRLite"));
return Result::ERROR_REVOKED_CERTIFICATE;
}
MOZ_LOG(
gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::CheckRevocation: certificate revoked via "
"CRLite (not enforced - telemetry only)"));
}
if (crliteRevocationState == nsICertStorage::STATE_NOT_ENROLLED) {
if (mCRLiteLookupResult) {
*mCRLiteLookupResult = CRLiteLookupResult::IssuerNotEnrolled;
}
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::CheckRevocation: issuer not enrolled"));
}
if (filterTimestamp == 0) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::CheckRevocation: no timestamp"));
if (mCRLiteLookupResult) {
*mCRLiteLookupResult = CRLiteLookupResult::FilterNotAvailable;
}
} else if (earliestCertificateTimestamp > filterTimestampTime) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::CheckRevocation: cert too new"));
if (mCRLiteLookupResult) {
*mCRLiteLookupResult = CRLiteLookupResult::CertificateTooNew;
}
} else if (crliteRevocationState == nsICertStorage::STATE_UNSET) {
certificateFoundValidInCRLiteFilter = true;
if (mCRLiteLookupResult) {
*mCRLiteLookupResult = CRLiteLookupResult::CertificateValid;
}
}
}
// Also check stashed CRLite revocations. 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;
rv = mCertStorage->IsCertRevokedByStash(
issuerSubjectPublicKeyInfoBytes, serialNumberBytes, &isRevokedByStash);
if (NS_FAILED(rv)) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::CheckRevocation: IsCertRevokedByStash "
"failed"));
if (mCRLiteLookupResult) {
*mCRLiteLookupResult = CRLiteLookupResult::LibraryFailure;
}
if (mCRLiteMode == CRLiteMode::Enforce) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
} else if (isRevokedByStash) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::CheckRevocation: IsCertRevokedByStash "
"returned true"));
if (mCRLiteLookupResult) {
*mCRLiteLookupResult = CRLiteLookupResult::CertRevokedByStash;
}
if (mCRLiteMode == CRLiteMode::Enforce) {
return Result::ERROR_REVOKED_CERTIFICATE;
}
} else if (certificateFoundValidInCRLiteFilter &&
mCRLiteMode == CRLiteMode::Enforce) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain::CheckRevocation: certificate covered by "
"CRLite, found to be valid -> skipping OCSP processing"));
return Success;
}
}
// Bug 991815: The BR allow OCSP for intermediates to be up to one year old.
// Since this affects EV there is no reason why DV should be more strict
// so all intermediates are allowed to have OCSP responses up to one year
// old.
uint16_t maxOCSPLifetimeInDays = 10;
if (endEntityOrCA == EndEntityOrCA::MustBeCA) {
maxOCSPLifetimeInDays = 365;
}
// 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.
//
// We only set the OCSP stapling status if we're validating the end-entity
// certificate. Non-end-entity certificates would always be
// OCSP_STAPLING_NONE unless/until we implement multi-stapling.
Result stapledOCSPResponseResult = Success;
if (stapledOCSPResponse) {
MOZ_ASSERT(endEntityOrCA == EndEntityOrCA::MustBeEndEntity);
bool expired;
stapledOCSPResponseResult = VerifyAndMaybeCacheEncodedOCSPResponse(
certID, time, maxOCSPLifetimeInDays, *stapledOCSPResponse,
ResponseWasStapled, expired);
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 if (endEntityOrCA == EndEntityOrCA::MustBeEndEntity) {
// 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) {
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));
// If we have a fresh OneCRL Blocklist we can skip OCSP for CA certs
bool blocklistIsFresh;
nsresult nsrv = mCertStorage->IsBlocklistFresh(&blocklistIsFresh);
if (NS_FAILED(nsrv)) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
// 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 ((mOCSPFetching == NeverFetchOCSP) || (validityDuration < shortLifetime) ||
(endEntityOrCA == EndEntityOrCA::MustBeCA &&
(mOCSPFetching == FetchOCSPForDVHardFail ||
mOCSPFetching == FetchOCSPForDVSoftFail || blocklistIsFresh))) {
// 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;
}
return Success;
}
if (mOCSPFetching == LocalOnlyOCSPForEV) {
if (cachedResponseResult != Success) {
return cachedResponseResult;
}
return Result::ERROR_OCSP_UNKNOWN_CERT;
}
UniquePLArenaPool arena(PORT_NewArena(DER_DEFAULT_CHUNKSIZE));
if (!arena) {
return Result::FATAL_ERROR_NO_MEMORY;
}
Result rv;
nsCString aiaLocation(VoidCString());
if (aiaExtension) {
rv = GetOCSPAuthorityInfoAccessLocation(arena, *aiaExtension, aiaLocation);
if (rv != Success) {
return rv;
}
}
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.
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);
}
return HandleOCSPFailure(cachedResponseResult, stapledOCSPResponseResult,
cachedResponseResult);
}
Result NSSCertDBTrustDomain::SynchronousCheckRevocationWithServer(
const CertID& certID, const nsCString& aiaLocation, Time time,
uint16_t maxOCSPLifetimeInDays, const Result cachedResponseResult,
const Result stapledOCSPResponseResult) {
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;
rv = DoOCSPRequest(aiaLocation, mOriginAttributes, ocspRequestBytes,
ocspRequestLength, GetOCSPTimeout(), ocspResponse);
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;
}
return HandleOCSPFailure(cachedResponseResult, stapledOCSPResponseResult,
rv);
}
// 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 (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;
}
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: end of CheckRevocation"));
return Success; // Soft fail -> success :(
}
Result NSSCertDBTrustDomain::HandleOCSPFailure(
const Result cachedResponseResult, const Result stapledOCSPResponseResult,
const Result error) {
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"));
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);
// We use a try and fallback approach which first mandates good signature
// digest algorithms, then falls back to SHA-1 if this fails. If a delegated
// OCSP response signing certificate was issued with a SHA-1 signature,
// verification initially fails. We cache the failure and then re-use that
// result even when doing fallback (i.e. when weak signature digest algorithms
// should succeed). To address this we use an OCSPVerificationTrustDomain
// here, rather than using *this, to ensure verification succeeds for all
// allowed signature digest algorithms.
OCSPVerificationTrustDomain trustDomain(*this);
Result rv = VerifyEncodedOCSPResponse(trustDomain, 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;
}
// If a certificate in the given chain appears to have been issued by one of
// seven roots operated by StartCom and WoSign that are not trusted to issue new
// certificates, verify that the end-entity has a notBefore date before 21
// October 2016. If the value of notBefore is after this time, the chain is not
// valid.
// (NB: While there are seven distinct roots being checked for, two of them
// share distinguished names, resulting in six distinct distinguished names to
// actually look for.)
static Result CheckForStartComOrWoSign(const UniqueCERTCertList& certChain) {
if (CERT_LIST_EMPTY(certChain)) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
const CERTCertListNode* endEntityNode = CERT_LIST_HEAD(certChain);
if (!endEntityNode || !endEntityNode->cert) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
PRTime notBefore;
PRTime notAfter;
if (CERT_GetCertTimes(endEntityNode->cert, &notBefore, &notAfter) !=
SECSuccess) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
// PRTime is microseconds since the epoch, whereas JS time is milliseconds.
// (new Date("2016-10-21T00:00:00Z")).getTime() * 1000
static const PRTime OCTOBER_21_2016 = 1477008000000000;
if (notBefore <= OCTOBER_21_2016) {
return Success;
}
for (const CERTCertListNode* node = CERT_LIST_HEAD(certChain);
!CERT_LIST_END(node, certChain); node = CERT_LIST_NEXT(node)) {
if (!node || !node->cert) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
if (CertDNIsInList(node->cert, StartComAndWoSignDNs)) {
return Result::ERROR_REVOKED_CERTIFICATE;
}
}
return Success;
}
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 UniqueCERTCertList& certList,
const SECTrustType certDBTrustType,
bool& isDistrusted) {
// 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;
}
// Allocate objects and retreive the root and end-entity certificates.
const CERTCertificate* certRoot = CERT_LIST_TAIL(certList)->cert;
const CERTCertificate* certLeaf = CERT_LIST_HEAD(certList)->cert;
// Set isDistrusted to false if there is no distrust for the root.
if (!certRoot->distrust) {
isDistrusted = false;
return NS_OK;
}
// 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;
SECStatus rv = GetCertDistrustAfterValue(distrustPtr, certRootDistrustAfter);
if (rv != SECSuccess) {
return NS_ERROR_FAILURE;
}
rv = GetCertNotBeforeValue(certLeaf, certLeafNotBefore);
if (rv != SECSuccess) {
return NS_ERROR_FAILURE;
}
// Compare the validity of the end-entity certificate with
// the distrust value of the root.
if (certLeafNotBefore <= certRootDistrustAfter) {
isDistrusted = false;
}
return NS_OK;
}
Result NSSCertDBTrustDomain::IsChainValid(const DERArray& certArray, Time time,
const CertPolicyId& requiredPolicy) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: IsChainValid"));
UniqueCERTCertList certList;
SECStatus srv =
ConstructCERTCertListFromReversedDERArray(certArray, certList);
if (srv != SECSuccess) {
return MapPRErrorCodeToResult(PR_GetError());
}
if (CERT_LIST_EMPTY(certList)) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
Result rv = CheckForStartComOrWoSign(certList);
if (rv != Success) {
return rv;
}
// Modernization in-progress: Keep certList as a CERTCertList for storage into
// the mBuiltChain variable at the end.
nsTArray<RefPtr<nsIX509Cert>> nssCertList;
nsresult nsrv = nsNSSCertificateDB::ConstructCertArrayFromUniqueCertList(
certList, nssCertList);
if (NS_FAILED(nsrv)) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
nsCOMPtr<nsIX509Cert> rootCert;
nsrv = nsNSSCertificate::GetRootCertificate(nssCertList, rootCert);
if (NS_FAILED(nsrv)) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
UniqueCERTCertificate root(rootCert->GetCert());
if (!root) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
bool isBuiltInRoot = false;
nsrv = rootCert->GetIsBuiltInRoot(&isBuiltInRoot);
if (NS_FAILED(nsrv)) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
bool skipPinningChecksBecauseOfMITMMode =
(!isBuiltInRoot && mPinningMode == CertVerifier::pinningAllowUserCAMITM);
// If mHostname isn't set, we're not verifying in the context of a TLS
// handshake, so don't verify HPKP in those cases.
if (mHostname && (mPinningMode != CertVerifier::pinningDisabled) &&
!skipPinningChecksBecauseOfMITMMode) {
bool enforceTestMode =
(mPinningMode == CertVerifier::pinningEnforceTestMode);
bool chainHasValidPins;
nsTArray<Span<const uint8_t>> derCertSpanList;
size_t numCerts = certArray.GetLength();
for (size_t i = numCerts; i > 0; --i) {
const Input* der = certArray.GetDER(i - 1);
if (!der) {
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
derCertSpanList.EmplaceBack(der->UnsafeGetData(), der->GetLength());
}
nsrv = PublicKeyPinningService::ChainHasValidPins(
derCertSpanList, mHostname, time, enforceTestMode, mOriginAttributes,
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 (isBuiltInRoot) {
bool isDistrusted;
nsrv =
isDistrustedCertificateChain(certList, 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.
if (mHostname && CertDNIsInList(root.get(), RootSymantecDNs)) {
rootCert = nullptr; // Clear the state for Segment...
nsTArray<RefPtr<nsIX509Cert>> intCerts;
nsCOMPtr<nsIX509Cert> eeCert;
nsrv = nsNSSCertificate::SegmentCertificateChain(nssCertList, rootCert,
intCerts, eeCert);
if (NS_FAILED(nsrv)) {
// This chain is supposed to be complete, so this is an error.
return Result::ERROR_ADDITIONAL_POLICY_CONSTRAINT_FAILED;
}
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(certList);
return Success;
}
Result NSSCertDBTrustDomain::CheckSignatureDigestAlgorithm(
DigestAlgorithm aAlg, EndEntityOrCA endEntityOrCA, Time notBefore) {
// (new Date("2016-01-01T00:00:00Z")).getTime() / 1000
static const Time JANUARY_FIRST_2016 = TimeFromEpochInSeconds(1451606400);
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("NSSCertDBTrustDomain: CheckSignatureDigestAlgorithm"));
if (aAlg == DigestAlgorithm::sha1) {
switch (mSHA1Mode) {
case CertVerifier::SHA1Mode::Forbidden:
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("SHA-1 certificate rejected"));
return Result::ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED;
case CertVerifier::SHA1Mode::ImportedRootOrBefore2016:
if (JANUARY_FIRST_2016 <= notBefore) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("Post-2015 SHA-1 certificate rejected"));
return Result::ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED;
}
break;
case CertVerifier::SHA1Mode::Allowed:
// Enforcing that the resulting chain uses an imported root is only
// possible at a higher level. This is done in CertVerifier::VerifyCert.
case CertVerifier::SHA1Mode::ImportedRoot:
default:
break;
// MSVC warns unless we explicitly handle this now-unused option.
case CertVerifier::SHA1Mode::UsedToBeBefore2016ButNowIsForbidden:
MOZ_ASSERT_UNREACHABLE("unexpected SHA1Mode type");
return Result::FATAL_ERROR_LIBRARY_FAILURE;
}
}
return Success;
}
Result NSSCertDBTrustDomain::CheckRSAPublicKeyModulusSizeInBits(
EndEntityOrCA /*endEntityOrCA*/, unsigned int modulusSizeInBits) {
if (modulusSizeInBits < mMinRSABits) {
return Result::ERROR_INADEQUATE_KEY_SIZE;
}
return Success;
}
Result NSSCertDBTrustDomain::VerifyRSAPKCS1SignedDigest(
const SignedDigest& signedDigest, Input subjectPublicKeyInfo) {
return VerifyRSAPKCS1SignedDigestNSS(signedDigest, 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::VerifyECDSASignedDigest(
const SignedDigest& signedDigest, Input subjectPublicKeyInfo) {
return VerifyECDSASignedDigestNSS(signedDigest, 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;
}
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::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);
}
bool LoadUserModuleAt(const char* moduleName, const char* libraryName,
const nsCString& dir) {
// 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("\"");
UniqueSECMODModule userModule(SECMOD_LoadUserModule(
const_cast<char*>(pkcs11ModuleSpec.get()), nullptr, false));
if (!userModule) {
return false;
}
if (!userModule->loaded) {
return false;
}
return true;
}