tenfourfox/security/certverifier/CertVerifier.cpp

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2017-04-19 07:56:45 +00:00
/* -*- 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 "CertVerifier.h"
#include <stdint.h>
#include "ExtendedValidation.h"
#include "NSSCertDBTrustDomain.h"
#include "NSSErrorsService.h"
#include "cert.h"
#include "pk11pub.h"
#include "pkix/pkix.h"
#include "pkix/pkixnss.h"
#include "prerror.h"
#include "secerr.h"
#include "sslerr.h"
using namespace mozilla::pkix;
using namespace mozilla::psm;
PRLogModuleInfo* gCertVerifierLog = nullptr;
namespace mozilla { namespace psm {
const CertVerifier::Flags CertVerifier::FLAG_LOCAL_ONLY = 1;
const CertVerifier::Flags CertVerifier::FLAG_MUST_BE_EV = 2;
const CertVerifier::Flags CertVerifier::FLAG_TLS_IGNORE_STATUS_REQUEST = 4;
CertVerifier::CertVerifier(OcspDownloadConfig odc,
OcspStrictConfig osc,
OcspGetConfig ogc,
uint32_t certShortLifetimeInDays,
PinningMode pinningMode,
SHA1Mode sha1Mode)
: mOCSPDownloadConfig(odc)
, mOCSPStrict(osc == ocspStrict)
, mOCSPGETEnabled(ogc == ocspGetEnabled)
, mCertShortLifetimeInDays(certShortLifetimeInDays)
, mPinningMode(pinningMode)
, mSHA1Mode(sha1Mode)
{
}
CertVerifier::~CertVerifier()
{
}
void
InitCertVerifierLog()
{
if (!gCertVerifierLog) {
gCertVerifierLog = PR_NewLogModule("certverifier");
}
}
SECStatus
IsCertBuiltInRoot(CERTCertificate* cert, bool& result) {
result = false;
ScopedPK11SlotList slots;
slots = PK11_GetAllSlotsForCert(cert, nullptr);
if (!slots) {
if (PORT_GetError() == SEC_ERROR_NO_TOKEN) {
// no list
return SECSuccess;
}
return SECFailure;
}
for (PK11SlotListElement* le = slots->head; le; le = le->next) {
char* token = PK11_GetTokenName(le->slot);
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("BuiltInRoot? subject=%s token=%s",cert->subjectName, token));
if (strcmp("Builtin Object Token", token) == 0) {
result = true;
return SECSuccess;
}
}
return SECSuccess;
}
static Result
BuildCertChainForOneKeyUsage(NSSCertDBTrustDomain& trustDomain, Input certDER,
Time time, KeyUsage ku1, KeyUsage ku2,
KeyUsage ku3, KeyPurposeId eku,
const CertPolicyId& requiredPolicy,
const Input* stapledOCSPResponse,
/*optional out*/ CertVerifier::OCSPStaplingStatus*
ocspStaplingStatus)
{
trustDomain.ResetOCSPStaplingStatus();
Result rv = BuildCertChain(trustDomain, certDER, time,
EndEntityOrCA::MustBeEndEntity, ku1,
eku, requiredPolicy, stapledOCSPResponse);
if (rv == Result::ERROR_INADEQUATE_KEY_USAGE) {
trustDomain.ResetOCSPStaplingStatus();
rv = BuildCertChain(trustDomain, certDER, time,
EndEntityOrCA::MustBeEndEntity, ku2,
eku, requiredPolicy, stapledOCSPResponse);
if (rv == Result::ERROR_INADEQUATE_KEY_USAGE) {
trustDomain.ResetOCSPStaplingStatus();
rv = BuildCertChain(trustDomain, certDER, time,
EndEntityOrCA::MustBeEndEntity, ku3,
eku, requiredPolicy, stapledOCSPResponse);
if (rv != Success) {
rv = Result::ERROR_INADEQUATE_KEY_USAGE;
}
}
}
if (ocspStaplingStatus) {
*ocspStaplingStatus = trustDomain.GetOCSPStaplingStatus();
}
return rv;
}
static const unsigned int MIN_RSA_BITS = 2048;
static const unsigned int MIN_RSA_BITS_WEAK = 1024;
SECStatus
CertVerifier::VerifyCert(CERTCertificate* cert, SECCertificateUsage usage,
Time time, void* pinArg, const char* hostname,
const Flags flags,
/*optional*/ const SECItem* stapledOCSPResponseSECItem,
/*optional out*/ ScopedCERTCertList* builtChain,
/*optional out*/ SECOidTag* evOidPolicy,
/*optional out*/ OCSPStaplingStatus* ocspStaplingStatus,
/*optional out*/ KeySizeStatus* keySizeStatus,
/*optional out*/ SignatureDigestStatus* sigDigestStatus,
/*optional out*/ PinningTelemetryInfo* pinningTelemetryInfo)
{
MOZ_LOG(gCertVerifierLog, LogLevel::Debug, ("Top of VerifyCert\n"));
PR_ASSERT(cert);
PR_ASSERT(usage == certificateUsageSSLServer || !(flags & FLAG_MUST_BE_EV));
PR_ASSERT(usage == certificateUsageSSLServer || !keySizeStatus);
PR_ASSERT(usage == certificateUsageSSLServer || !sigDigestStatus);
if (builtChain) {
*builtChain = nullptr;
}
if (evOidPolicy) {
*evOidPolicy = SEC_OID_UNKNOWN;
}
if (ocspStaplingStatus) {
if (usage != certificateUsageSSLServer) {
PR_SetError(SEC_ERROR_INVALID_ARGS, 0);
return SECFailure;
}
*ocspStaplingStatus = OCSP_STAPLING_NEVER_CHECKED;
}
if (keySizeStatus) {
if (usage != certificateUsageSSLServer) {
PR_SetError(SEC_ERROR_INVALID_ARGS, 0);
return SECFailure;
}
*keySizeStatus = KeySizeStatus::NeverChecked;
}
if (sigDigestStatus) {
if (usage != certificateUsageSSLServer) {
PR_SetError(SEC_ERROR_INVALID_ARGS, 0);
return SECFailure;
}
*sigDigestStatus = SignatureDigestStatus::NeverChecked;
}
if (!cert ||
(usage != certificateUsageSSLServer && (flags & FLAG_MUST_BE_EV))) {
PR_SetError(SEC_ERROR_INVALID_ARGS, 0);
return SECFailure;
}
Result rv;
Input certDER;
rv = certDER.Init(cert->derCert.data, cert->derCert.len);
if (rv != Success) {
PR_SetError(MapResultToPRErrorCode(rv), 0);
return SECFailure;
}
// We configure the OCSP fetching modes separately for EV and non-EV
// verifications.
NSSCertDBTrustDomain::OCSPFetching defaultOCSPFetching
= (mOCSPDownloadConfig == ocspOff) ||
(mOCSPDownloadConfig == ocspEVOnly) ||
(flags & FLAG_LOCAL_ONLY) ? NSSCertDBTrustDomain::NeverFetchOCSP
: !mOCSPStrict ? NSSCertDBTrustDomain::FetchOCSPForDVSoftFail
: NSSCertDBTrustDomain::FetchOCSPForDVHardFail;
OcspGetConfig ocspGETConfig = mOCSPGETEnabled ? ocspGetEnabled
: ocspGetDisabled;
Input stapledOCSPResponseInput;
const Input* stapledOCSPResponse = nullptr;
if (stapledOCSPResponseSECItem) {
rv = stapledOCSPResponseInput.Init(stapledOCSPResponseSECItem->data,
stapledOCSPResponseSECItem->len);
if (rv != Success) {
// The stapled OCSP response was too big.
PR_SetError(SEC_ERROR_OCSP_MALFORMED_RESPONSE, 0);
return SECFailure;
}
stapledOCSPResponse = &stapledOCSPResponseInput;
}
switch (usage) {
case certificateUsageSSLClient: {
// XXX: We don't really have a trust bit for SSL client authentication so
// just use trustEmail as it is the closest alternative.
NSSCertDBTrustDomain trustDomain(trustEmail, defaultOCSPFetching,
mOCSPCache, pinArg, ocspGETConfig,
mCertShortLifetimeInDays,
pinningDisabled, MIN_RSA_BITS_WEAK,
ValidityCheckingMode::CheckingOff,
AcceptAllAlgorithms, SHA1Mode::Allowed,
nullptr, nullptr, builtChain);
rv = BuildCertChain(trustDomain, certDER, time,
EndEntityOrCA::MustBeEndEntity,
KeyUsage::digitalSignature,
KeyPurposeId::id_kp_clientAuth,
CertPolicyId::anyPolicy, stapledOCSPResponse);
break;
}
case certificateUsageSSLServer: {
// TODO: When verifying a certificate in an SSL handshake, we should
// restrict the acceptable key usage based on the key exchange method
// chosen by the server.
SignatureDigestOption digestAlgorithmOptions[] = {
DisableSHA1Everywhere,
DisableSHA1ForCA,
DisableSHA1ForEE,
AcceptAllAlgorithms
};
SignatureDigestStatus digestAlgorithmStatuses[] = {
SignatureDigestStatus::GoodAlgorithmsOnly,
SignatureDigestStatus::WeakEECert,
SignatureDigestStatus::WeakCACert,
SignatureDigestStatus::WeakCAAndEE
};
size_t digestAlgorithmOptionsCount = MOZ_ARRAY_LENGTH(digestAlgorithmStatuses);
static_assert(MOZ_ARRAY_LENGTH(digestAlgorithmOptions) ==
MOZ_ARRAY_LENGTH(digestAlgorithmStatuses),
"digestAlgorithm array lengths differ");
rv = Result::ERROR_UNKNOWN_ERROR;
#ifndef MOZ_NO_EV_CERTS
// Try to validate for EV first.
NSSCertDBTrustDomain::OCSPFetching evOCSPFetching
= (mOCSPDownloadConfig == ocspOff) ||
(flags & FLAG_LOCAL_ONLY) ? NSSCertDBTrustDomain::LocalOnlyOCSPForEV
: NSSCertDBTrustDomain::FetchOCSPForEV;
CertPolicyId evPolicy;
SECOidTag evPolicyOidTag;
SECStatus srv = GetFirstEVPolicy(cert, evPolicy, evPolicyOidTag);
for (size_t i=0;
i < digestAlgorithmOptionsCount && rv != Success && srv == SECSuccess;
i++) {
// Because of the try-strict and fallback approach, we have to clear any
// previously noted telemetry information
if (pinningTelemetryInfo) {
pinningTelemetryInfo->Reset();
}
NSSCertDBTrustDomain
trustDomain(trustSSL, evOCSPFetching,
mOCSPCache, pinArg, ocspGETConfig,
mCertShortLifetimeInDays, mPinningMode, MIN_RSA_BITS,
ValidityCheckingMode::CheckForEV,
digestAlgorithmOptions[i], mSHA1Mode,
pinningTelemetryInfo, hostname, builtChain);
rv = BuildCertChainForOneKeyUsage(trustDomain, certDER, time,
KeyUsage::digitalSignature,// (EC)DHE
KeyUsage::keyEncipherment, // RSA
KeyUsage::keyAgreement, // (EC)DH
KeyPurposeId::id_kp_serverAuth,
evPolicy, stapledOCSPResponse,
ocspStaplingStatus);
if (rv == Success) {
MOZ_LOG(gCertVerifierLog, LogLevel::Debug,
("cert is EV with status %i\n", digestAlgorithmStatuses[i]));
if (evOidPolicy) {
*evOidPolicy = evPolicyOidTag;
}
if (sigDigestStatus) {
*sigDigestStatus = digestAlgorithmStatuses[i];
}
}
}
if (rv == Success) {
break;
}
#endif
if (flags & FLAG_MUST_BE_EV) {
rv = Result::ERROR_POLICY_VALIDATION_FAILED;
break;
}
// Now try non-EV.
unsigned int keySizeOptions[] = {
MIN_RSA_BITS,
MIN_RSA_BITS_WEAK
};
KeySizeStatus keySizeStatuses[] = {
KeySizeStatus::LargeMinimumSucceeded,
KeySizeStatus::CompatibilityRisk
};
static_assert(MOZ_ARRAY_LENGTH(keySizeOptions) ==
MOZ_ARRAY_LENGTH(keySizeStatuses),
"keySize array lengths differ");
size_t keySizeOptionsCount = MOZ_ARRAY_LENGTH(keySizeStatuses);
for (size_t i=0; i<keySizeOptionsCount && rv != Success; i++) {
for (size_t j=0; j<digestAlgorithmOptionsCount && rv != Success; j++) {
// invalidate any telemetry info relating to failed chains
if (pinningTelemetryInfo) {
pinningTelemetryInfo->Reset();
}
// If we're not going to do SHA-1 in any case, don't try
if (mSHA1Mode == SHA1Mode::Forbidden &&
digestAlgorithmOptions[i] != DisableSHA1Everywhere) {
continue;
}
NSSCertDBTrustDomain trustDomain(trustSSL, defaultOCSPFetching,
mOCSPCache, pinArg, ocspGETConfig,
mCertShortLifetimeInDays,
mPinningMode, keySizeOptions[i],
ValidityCheckingMode::CheckingOff,
digestAlgorithmOptions[j],
mSHA1Mode, pinningTelemetryInfo,
hostname, builtChain);
rv = BuildCertChainForOneKeyUsage(trustDomain, certDER, time,
KeyUsage::digitalSignature,//(EC)DHE
KeyUsage::keyEncipherment,//RSA
KeyUsage::keyAgreement,//(EC)DH
KeyPurposeId::id_kp_serverAuth,
CertPolicyId::anyPolicy,
stapledOCSPResponse,
ocspStaplingStatus);
if (rv == Success) {
if (keySizeStatus) {
*keySizeStatus = keySizeStatuses[i];
}
if (sigDigestStatus) {
*sigDigestStatus = digestAlgorithmStatuses[j];
}
}
}
}
if (rv == Success) {
// If SHA-1 is forbidden by preference, don't accumulate SHA-1
// telemetry, to avoid skewing the results.
if (sigDigestStatus && mSHA1Mode == SHA1Mode::Forbidden) {
*sigDigestStatus = SignatureDigestStatus::NeverChecked;
}
break;
}
if (keySizeStatus) {
*keySizeStatus = KeySizeStatus::AlreadyBad;
}
if (sigDigestStatus && mSHA1Mode != SHA1Mode::Forbidden) {
*sigDigestStatus = SignatureDigestStatus::AlreadyBad;
}
break;
}
case certificateUsageSSLCA: {
NSSCertDBTrustDomain trustDomain(trustSSL, defaultOCSPFetching,
mOCSPCache, pinArg, ocspGETConfig,
mCertShortLifetimeInDays,
pinningDisabled, MIN_RSA_BITS_WEAK,
ValidityCheckingMode::CheckingOff,
AcceptAllAlgorithms, mSHA1Mode,
nullptr, nullptr, builtChain);
rv = BuildCertChain(trustDomain, certDER, time,
EndEntityOrCA::MustBeCA, KeyUsage::keyCertSign,
KeyPurposeId::id_kp_serverAuth,
CertPolicyId::anyPolicy, stapledOCSPResponse);
break;
}
case certificateUsageEmailSigner: {
NSSCertDBTrustDomain trustDomain(trustEmail, defaultOCSPFetching,
mOCSPCache, pinArg, ocspGETConfig,
mCertShortLifetimeInDays,
pinningDisabled, MIN_RSA_BITS_WEAK,
ValidityCheckingMode::CheckingOff,
AcceptAllAlgorithms, SHA1Mode::Allowed,
nullptr, nullptr, builtChain);
rv = BuildCertChain(trustDomain, certDER, time,
EndEntityOrCA::MustBeEndEntity,
KeyUsage::digitalSignature,
KeyPurposeId::id_kp_emailProtection,
CertPolicyId::anyPolicy, stapledOCSPResponse);
if (rv == Result::ERROR_INADEQUATE_KEY_USAGE) {
rv = BuildCertChain(trustDomain, certDER, time,
EndEntityOrCA::MustBeEndEntity,
KeyUsage::nonRepudiation,
KeyPurposeId::id_kp_emailProtection,
CertPolicyId::anyPolicy, stapledOCSPResponse);
}
break;
}
case certificateUsageEmailRecipient: {
// TODO: The higher level S/MIME processing should pass in which key
// usage it is trying to verify for, and base its algorithm choices
// based on the result of the verification(s).
NSSCertDBTrustDomain trustDomain(trustEmail, defaultOCSPFetching,
mOCSPCache, pinArg, ocspGETConfig,
mCertShortLifetimeInDays,
pinningDisabled, MIN_RSA_BITS_WEAK,
ValidityCheckingMode::CheckingOff,
AcceptAllAlgorithms, SHA1Mode::Allowed,
nullptr, nullptr, builtChain);
rv = BuildCertChain(trustDomain, certDER, time,
EndEntityOrCA::MustBeEndEntity,
KeyUsage::keyEncipherment, // RSA
KeyPurposeId::id_kp_emailProtection,
CertPolicyId::anyPolicy, stapledOCSPResponse);
if (rv == Result::ERROR_INADEQUATE_KEY_USAGE) {
rv = BuildCertChain(trustDomain, certDER, time,
EndEntityOrCA::MustBeEndEntity,
KeyUsage::keyAgreement, // ECDH/DH
KeyPurposeId::id_kp_emailProtection,
CertPolicyId::anyPolicy, stapledOCSPResponse);
}
break;
}
case certificateUsageObjectSigner: {
NSSCertDBTrustDomain trustDomain(trustObjectSigning, defaultOCSPFetching,
mOCSPCache, pinArg, ocspGETConfig,
mCertShortLifetimeInDays,
pinningDisabled, MIN_RSA_BITS_WEAK,
ValidityCheckingMode::CheckingOff,
AcceptAllAlgorithms, SHA1Mode::Allowed,
nullptr, nullptr, builtChain);
rv = BuildCertChain(trustDomain, certDER, time,
EndEntityOrCA::MustBeEndEntity,
KeyUsage::digitalSignature,
KeyPurposeId::id_kp_codeSigning,
CertPolicyId::anyPolicy, stapledOCSPResponse);
break;
}
case certificateUsageVerifyCA:
case certificateUsageStatusResponder: {
// XXX This is a pretty useless way to verify a certificate. It is used
// by the certificate viewer UI. Because we don't know what trust bit is
// interesting, we just try them all.
mozilla::pkix::EndEntityOrCA endEntityOrCA;
mozilla::pkix::KeyUsage keyUsage;
KeyPurposeId eku;
if (usage == certificateUsageVerifyCA) {
endEntityOrCA = EndEntityOrCA::MustBeCA;
keyUsage = KeyUsage::keyCertSign;
eku = KeyPurposeId::anyExtendedKeyUsage;
} else {
endEntityOrCA = EndEntityOrCA::MustBeEndEntity;
keyUsage = KeyUsage::digitalSignature;
eku = KeyPurposeId::id_kp_OCSPSigning;
}
NSSCertDBTrustDomain sslTrust(trustSSL, defaultOCSPFetching, mOCSPCache,
pinArg, ocspGETConfig, mCertShortLifetimeInDays,
pinningDisabled, MIN_RSA_BITS_WEAK,
ValidityCheckingMode::CheckingOff,
AcceptAllAlgorithms, SHA1Mode::Allowed,
nullptr, nullptr, builtChain);
rv = BuildCertChain(sslTrust, certDER, time, endEntityOrCA,
keyUsage, eku, CertPolicyId::anyPolicy,
stapledOCSPResponse);
if (rv == Result::ERROR_UNKNOWN_ISSUER) {
NSSCertDBTrustDomain emailTrust(trustEmail, defaultOCSPFetching,
mOCSPCache, pinArg, ocspGETConfig,
mCertShortLifetimeInDays,
pinningDisabled, MIN_RSA_BITS_WEAK,
ValidityCheckingMode::CheckingOff,
AcceptAllAlgorithms, SHA1Mode::Allowed,
nullptr, nullptr, builtChain);
rv = BuildCertChain(emailTrust, certDER, time, endEntityOrCA,
keyUsage, eku, CertPolicyId::anyPolicy,
stapledOCSPResponse);
if (rv == Result::ERROR_UNKNOWN_ISSUER) {
NSSCertDBTrustDomain objectSigningTrust(trustObjectSigning,
defaultOCSPFetching, mOCSPCache,
pinArg, ocspGETConfig,
mCertShortLifetimeInDays,
pinningDisabled,
MIN_RSA_BITS_WEAK,
ValidityCheckingMode::CheckingOff,
AcceptAllAlgorithms, SHA1Mode::Allowed,
nullptr, nullptr, builtChain);
rv = BuildCertChain(objectSigningTrust, certDER, time,
endEntityOrCA, keyUsage, eku,
CertPolicyId::anyPolicy, stapledOCSPResponse);
}
}
break;
}
default:
rv = Result::FATAL_ERROR_INVALID_ARGS;
}
if (rv != Success) {
PR_SetError(MapResultToPRErrorCode(rv), 0);
return SECFailure;
}
return SECSuccess;
}
SECStatus
CertVerifier::VerifySSLServerCert(CERTCertificate* peerCert,
/*optional*/ const SECItem* stapledOCSPResponse,
Time time,
/*optional*/ void* pinarg,
const char* hostname,
bool saveIntermediatesInPermanentDatabase,
Flags flags,
/*optional out*/ ScopedCERTCertList* builtChain,
/*optional out*/ SECOidTag* evOidPolicy,
/*optional out*/ OCSPStaplingStatus* ocspStaplingStatus,
/*optional out*/ KeySizeStatus* keySizeStatus,
/*optional out*/ SignatureDigestStatus* sigDigestStatus,
/*optional out*/ PinningTelemetryInfo* pinningTelemetryInfo)
{
PR_ASSERT(peerCert);
// XXX: PR_ASSERT(pinarg)
PR_ASSERT(hostname);
PR_ASSERT(hostname[0]);
if (builtChain) {
*builtChain = nullptr;
}
if (evOidPolicy) {
*evOidPolicy = SEC_OID_UNKNOWN;
}
if (!hostname || !hostname[0]) {
PR_SetError(SSL_ERROR_BAD_CERT_DOMAIN, 0);
return SECFailure;
}
ScopedCERTCertList builtChainTemp;
// CreateCertErrorRunnable assumes that CheckCertHostname is only called
// if VerifyCert succeeded.
SECStatus rv = VerifyCert(peerCert, certificateUsageSSLServer, time, pinarg,
hostname, flags, stapledOCSPResponse,
&builtChainTemp, evOidPolicy, ocspStaplingStatus,
keySizeStatus, sigDigestStatus,
pinningTelemetryInfo);
if (rv != SECSuccess) {
return rv;
}
Input peerCertInput;
Result result = peerCertInput.Init(peerCert->derCert.data,
peerCert->derCert.len);
if (result != Success) {
PR_SetError(MapResultToPRErrorCode(result), 0);
return SECFailure;
}
Input stapledOCSPResponseInput;
Input* responseInputPtr = nullptr;
if (stapledOCSPResponse) {
result = stapledOCSPResponseInput.Init(stapledOCSPResponse->data,
stapledOCSPResponse->len);
if (result != Success) {
// The stapled OCSP response was too big.
PR_SetError(SEC_ERROR_OCSP_MALFORMED_RESPONSE, 0);
return SECFailure;
}
responseInputPtr = &stapledOCSPResponseInput;
}
if (!(flags & FLAG_TLS_IGNORE_STATUS_REQUEST)) {
result = CheckTLSFeaturesAreSatisfied(peerCertInput, responseInputPtr);
if (result != Success) {
PR_SetError(MapResultToPRErrorCode(result), 0);
return SECFailure;
}
}
Input hostnameInput;
result = hostnameInput.Init(uint8_t_ptr_cast(hostname), strlen(hostname));
if (result != Success) {
PR_SetError(SEC_ERROR_INVALID_ARGS, 0);
return SECFailure;
}
result = CheckCertHostname(peerCertInput, hostnameInput);
if (result != Success) {
// Treat malformed name information as a domain mismatch.
if (result == Result::ERROR_BAD_DER) {
PR_SetError(SSL_ERROR_BAD_CERT_DOMAIN, 0);
} else {
PR_SetError(MapResultToPRErrorCode(result), 0);
}
return SECFailure;
}
if (saveIntermediatesInPermanentDatabase) {
SaveIntermediateCerts(builtChainTemp);
}
if (builtChain) {
*builtChain = builtChainTemp.forget();
}
return SECSuccess;
}
} } // namespace mozilla::psm