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https://github.com/mozilla/gecko-dev.git
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551 lines
21 KiB
C++
551 lines
21 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "CertVerifier.h"
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#include <stdint.h>
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#include "ExtendedValidation.h"
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#include "NSSCertDBTrustDomain.h"
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#include "NSSErrorsService.h"
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#include "PublicKeyPinningService.h"
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#include "cert.h"
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#include "pk11pub.h"
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#include "pkix/pkix.h"
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#include "pkix/pkixnss.h"
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#include "prerror.h"
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#include "secerr.h"
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#include "sslerr.h"
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using namespace mozilla::pkix;
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using namespace mozilla::psm;
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#ifdef PR_LOGGING
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PRLogModuleInfo* gCertVerifierLog = nullptr;
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#endif
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namespace mozilla { namespace psm {
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const CertVerifier::Flags CertVerifier::FLAG_LOCAL_ONLY = 1;
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const CertVerifier::Flags CertVerifier::FLAG_MUST_BE_EV = 2;
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CertVerifier::CertVerifier(OcspDownloadConfig odc,
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OcspStrictConfig osc,
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OcspGetConfig ogc,
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PinningMode pinningMode)
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: mOCSPDownloadEnabled(odc == ocspOn)
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, mOCSPStrict(osc == ocspStrict)
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, mOCSPGETEnabled(ogc == ocspGetEnabled)
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, mPinningMode(pinningMode)
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{
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}
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CertVerifier::~CertVerifier()
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{
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}
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void
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InitCertVerifierLog()
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{
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#ifdef PR_LOGGING
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if (!gCertVerifierLog) {
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gCertVerifierLog = PR_NewLogModule("certverifier");
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}
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#endif
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}
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SECStatus
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IsCertBuiltInRoot(CERTCertificate* cert, bool& result) {
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result = false;
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ScopedPK11SlotList slots;
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slots = PK11_GetAllSlotsForCert(cert, nullptr);
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if (!slots) {
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if (PORT_GetError() == SEC_ERROR_NO_TOKEN) {
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// no list
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return SECSuccess;
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}
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return SECFailure;
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}
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for (PK11SlotListElement* le = slots->head; le; le = le->next) {
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char* token = PK11_GetTokenName(le->slot);
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PR_LOG(gCertVerifierLog, PR_LOG_DEBUG,
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("BuiltInRoot? subject=%s token=%s",cert->subjectName, token));
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if (strcmp("Builtin Object Token", token) == 0) {
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result = true;
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return SECSuccess;
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}
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}
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return SECSuccess;
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}
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Result
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CertListContainsExpectedKeys(const CERTCertList* certList,
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const char* hostname, Time time,
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CertVerifier::PinningMode pinningMode)
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{
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if (pinningMode == CertVerifier::pinningDisabled) {
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PR_LOG(gCertVerifierLog, PR_LOG_DEBUG,
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("Pinning is disabled; not checking keys."));
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return Success;
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}
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if (!certList) {
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return Result::FATAL_ERROR_INVALID_ARGS;
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}
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CERTCertListNode* rootNode = CERT_LIST_TAIL(certList);
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if (CERT_LIST_END(rootNode, certList)) {
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return Result::FATAL_ERROR_INVALID_ARGS;
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}
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bool isBuiltInRoot = false;
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SECStatus srv = IsCertBuiltInRoot(rootNode->cert, isBuiltInRoot);
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if (srv != SECSuccess) {
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return MapPRErrorCodeToResult(PR_GetError());
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}
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// If desired, the user can enable "allow user CA MITM mode", in which
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// case key pinning is not enforced for certificates that chain to trust
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// anchors that are not in Mozilla's root program
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if (!isBuiltInRoot && pinningMode == CertVerifier::pinningAllowUserCAMITM) {
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return Success;
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}
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bool enforceTestMode = (pinningMode == CertVerifier::pinningEnforceTestMode);
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if (PublicKeyPinningService::ChainHasValidPins(certList, hostname, time,
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enforceTestMode)) {
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return Success;
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}
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return Result::ERROR_KEY_PINNING_FAILURE;
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}
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static Result
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BuildCertChainForOneKeyUsage(NSSCertDBTrustDomain& trustDomain, Input certDER,
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Time time, KeyUsage ku1, KeyUsage ku2,
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KeyUsage ku3, KeyPurposeId eku,
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const CertPolicyId& requiredPolicy,
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const Input* stapledOCSPResponse,
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/*optional out*/ CertVerifier::OCSPStaplingStatus*
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ocspStaplingStatus)
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{
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trustDomain.ResetOCSPStaplingStatus();
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Result rv = BuildCertChain(trustDomain, certDER, time,
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EndEntityOrCA::MustBeEndEntity, ku1,
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eku, requiredPolicy, stapledOCSPResponse);
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if (rv == Result::ERROR_INADEQUATE_KEY_USAGE) {
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trustDomain.ResetOCSPStaplingStatus();
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rv = BuildCertChain(trustDomain, certDER, time,
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EndEntityOrCA::MustBeEndEntity, ku2,
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eku, requiredPolicy, stapledOCSPResponse);
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if (rv == Result::ERROR_INADEQUATE_KEY_USAGE) {
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trustDomain.ResetOCSPStaplingStatus();
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rv = BuildCertChain(trustDomain, certDER, time,
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EndEntityOrCA::MustBeEndEntity, ku3,
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eku, requiredPolicy, stapledOCSPResponse);
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if (rv != Success) {
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rv = Result::ERROR_INADEQUATE_KEY_USAGE;
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}
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}
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}
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if (ocspStaplingStatus) {
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*ocspStaplingStatus = trustDomain.GetOCSPStaplingStatus();
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}
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return rv;
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}
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static const unsigned int MIN_RSA_BITS = 2048;
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static const unsigned int MIN_RSA_BITS_WEAK = 1024;
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SECStatus
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CertVerifier::VerifyCert(CERTCertificate* cert, SECCertificateUsage usage,
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Time time, void* pinArg, const char* hostname,
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const Flags flags,
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/*optional*/ const SECItem* stapledOCSPResponseSECItem,
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/*optional out*/ ScopedCERTCertList* builtChain,
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/*optional out*/ SECOidTag* evOidPolicy,
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/*optional out*/ OCSPStaplingStatus* ocspStaplingStatus,
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/*optional out*/ KeySizeStatus* keySizeStatus)
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{
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PR_LOG(gCertVerifierLog, PR_LOG_DEBUG, ("Top of VerifyCert\n"));
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PR_ASSERT(cert);
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PR_ASSERT(usage == certificateUsageSSLServer || !(flags & FLAG_MUST_BE_EV));
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PR_ASSERT(usage == certificateUsageSSLServer || !keySizeStatus);
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if (builtChain) {
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*builtChain = nullptr;
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}
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if (evOidPolicy) {
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*evOidPolicy = SEC_OID_UNKNOWN;
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}
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if (ocspStaplingStatus) {
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if (usage != certificateUsageSSLServer) {
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PR_SetError(SEC_ERROR_INVALID_ARGS, 0);
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return SECFailure;
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}
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*ocspStaplingStatus = OCSP_STAPLING_NEVER_CHECKED;
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}
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if (keySizeStatus) {
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if (usage != certificateUsageSSLServer) {
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PR_SetError(SEC_ERROR_INVALID_ARGS, 0);
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return SECFailure;
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}
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*keySizeStatus = KeySizeStatus::NeverChecked;
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}
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if (!cert ||
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(usage != certificateUsageSSLServer && (flags & FLAG_MUST_BE_EV))) {
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PR_SetError(SEC_ERROR_INVALID_ARGS, 0);
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return SECFailure;
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}
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Result rv;
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Input certDER;
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rv = certDER.Init(cert->derCert.data, cert->derCert.len);
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if (rv != Success) {
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PR_SetError(MapResultToPRErrorCode(rv), 0);
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return SECFailure;
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}
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NSSCertDBTrustDomain::OCSPFetching ocspFetching
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= !mOCSPDownloadEnabled ||
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(flags & FLAG_LOCAL_ONLY) ? NSSCertDBTrustDomain::NeverFetchOCSP
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: !mOCSPStrict ? NSSCertDBTrustDomain::FetchOCSPForDVSoftFail
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: NSSCertDBTrustDomain::FetchOCSPForDVHardFail;
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OcspGetConfig ocspGETConfig = mOCSPGETEnabled ? ocspGetEnabled
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: ocspGetDisabled;
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Input stapledOCSPResponseInput;
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const Input* stapledOCSPResponse = nullptr;
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if (stapledOCSPResponseSECItem) {
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rv = stapledOCSPResponseInput.Init(stapledOCSPResponseSECItem->data,
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stapledOCSPResponseSECItem->len);
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if (rv != Success) {
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// The stapled OCSP response was too big.
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PR_SetError(SEC_ERROR_OCSP_MALFORMED_RESPONSE, 0);
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return SECFailure;
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}
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stapledOCSPResponse = &stapledOCSPResponseInput;
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}
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switch (usage) {
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case certificateUsageSSLClient: {
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// XXX: We don't really have a trust bit for SSL client authentication so
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// just use trustEmail as it is the closest alternative.
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NSSCertDBTrustDomain trustDomain(trustEmail, ocspFetching, mOCSPCache,
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pinArg, ocspGETConfig, pinningDisabled,
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MIN_RSA_BITS_WEAK, nullptr, builtChain);
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rv = BuildCertChain(trustDomain, certDER, time,
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EndEntityOrCA::MustBeEndEntity,
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KeyUsage::digitalSignature,
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KeyPurposeId::id_kp_clientAuth,
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CertPolicyId::anyPolicy, stapledOCSPResponse);
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break;
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}
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case certificateUsageSSLServer: {
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// TODO: When verifying a certificate in an SSL handshake, we should
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// restrict the acceptable key usage based on the key exchange method
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// chosen by the server.
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#ifndef MOZ_NO_EV_CERTS
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// Try to validate for EV first.
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CertPolicyId evPolicy;
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SECOidTag evPolicyOidTag;
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SECStatus srv = GetFirstEVPolicy(cert, evPolicy, evPolicyOidTag);
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if (srv == SECSuccess) {
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NSSCertDBTrustDomain
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trustDomain(trustSSL,
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ocspFetching == NSSCertDBTrustDomain::NeverFetchOCSP
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? NSSCertDBTrustDomain::LocalOnlyOCSPForEV
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: NSSCertDBTrustDomain::FetchOCSPForEV,
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mOCSPCache, pinArg, ocspGETConfig, mPinningMode,
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MIN_RSA_BITS, hostname, builtChain);
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rv = BuildCertChainForOneKeyUsage(trustDomain, certDER, time,
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KeyUsage::digitalSignature,// (EC)DHE
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KeyUsage::keyEncipherment, // RSA
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KeyUsage::keyAgreement, // (EC)DH
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KeyPurposeId::id_kp_serverAuth,
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evPolicy, stapledOCSPResponse,
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ocspStaplingStatus);
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if (rv == Success) {
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if (evOidPolicy) {
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*evOidPolicy = evPolicyOidTag;
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}
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break;
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}
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}
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#endif
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if (flags & FLAG_MUST_BE_EV) {
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rv = Result::ERROR_POLICY_VALIDATION_FAILED;
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break;
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}
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// Now try non-EV.
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NSSCertDBTrustDomain trustDomain(trustSSL, ocspFetching, mOCSPCache,
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pinArg, ocspGETConfig, mPinningMode,
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MIN_RSA_BITS, hostname, builtChain);
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rv = BuildCertChainForOneKeyUsage(trustDomain, certDER, time,
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KeyUsage::digitalSignature, // (EC)DHE
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KeyUsage::keyEncipherment, // RSA
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KeyUsage::keyAgreement, // (EC)DH
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KeyPurposeId::id_kp_serverAuth,
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CertPolicyId::anyPolicy,
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stapledOCSPResponse,
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ocspStaplingStatus);
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if (rv == Success) {
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if (keySizeStatus) {
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*keySizeStatus = KeySizeStatus::LargeMinimumSucceeded;
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}
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break;
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}
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// If that failed, try again with a smaller minimum key size.
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NSSCertDBTrustDomain trustDomainWeak(trustSSL, ocspFetching, mOCSPCache,
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pinArg, ocspGETConfig, mPinningMode,
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MIN_RSA_BITS_WEAK, hostname,
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builtChain);
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rv = BuildCertChainForOneKeyUsage(trustDomainWeak, certDER, time,
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KeyUsage::digitalSignature, // (EC)DHE
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KeyUsage::keyEncipherment, // RSA
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KeyUsage::keyAgreement, // (EC)DH
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KeyPurposeId::id_kp_serverAuth,
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CertPolicyId::anyPolicy,
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stapledOCSPResponse,
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ocspStaplingStatus);
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if (keySizeStatus) {
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if (rv == Success) {
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*keySizeStatus = KeySizeStatus::CompatibilityRisk;
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} else {
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*keySizeStatus = KeySizeStatus::AlreadyBad;
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}
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}
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break;
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}
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case certificateUsageSSLCA: {
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NSSCertDBTrustDomain trustDomain(trustSSL, ocspFetching, mOCSPCache,
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pinArg, ocspGETConfig, pinningDisabled,
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MIN_RSA_BITS_WEAK, nullptr, builtChain);
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rv = BuildCertChain(trustDomain, certDER, time,
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EndEntityOrCA::MustBeCA, KeyUsage::keyCertSign,
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KeyPurposeId::id_kp_serverAuth,
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CertPolicyId::anyPolicy, stapledOCSPResponse);
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break;
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}
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case certificateUsageEmailSigner: {
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NSSCertDBTrustDomain trustDomain(trustEmail, ocspFetching, mOCSPCache,
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pinArg, ocspGETConfig, pinningDisabled,
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MIN_RSA_BITS_WEAK, nullptr, builtChain);
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rv = BuildCertChain(trustDomain, certDER, time,
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EndEntityOrCA::MustBeEndEntity,
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KeyUsage::digitalSignature,
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KeyPurposeId::id_kp_emailProtection,
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CertPolicyId::anyPolicy, stapledOCSPResponse);
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if (rv == Result::ERROR_INADEQUATE_KEY_USAGE) {
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rv = BuildCertChain(trustDomain, certDER, time,
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EndEntityOrCA::MustBeEndEntity,
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KeyUsage::nonRepudiation,
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KeyPurposeId::id_kp_emailProtection,
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CertPolicyId::anyPolicy, stapledOCSPResponse);
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}
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break;
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}
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case certificateUsageEmailRecipient: {
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// TODO: The higher level S/MIME processing should pass in which key
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// usage it is trying to verify for, and base its algorithm choices
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// based on the result of the verification(s).
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NSSCertDBTrustDomain trustDomain(trustEmail, ocspFetching, mOCSPCache,
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pinArg, ocspGETConfig, pinningDisabled,
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MIN_RSA_BITS_WEAK, nullptr, builtChain);
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rv = BuildCertChain(trustDomain, certDER, time,
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EndEntityOrCA::MustBeEndEntity,
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KeyUsage::keyEncipherment, // RSA
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KeyPurposeId::id_kp_emailProtection,
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CertPolicyId::anyPolicy, stapledOCSPResponse);
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if (rv == Result::ERROR_INADEQUATE_KEY_USAGE) {
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rv = BuildCertChain(trustDomain, certDER, time,
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EndEntityOrCA::MustBeEndEntity,
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KeyUsage::keyAgreement, // ECDH/DH
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KeyPurposeId::id_kp_emailProtection,
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CertPolicyId::anyPolicy, stapledOCSPResponse);
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}
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break;
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}
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case certificateUsageObjectSigner: {
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NSSCertDBTrustDomain trustDomain(trustObjectSigning, ocspFetching,
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mOCSPCache, pinArg, ocspGETConfig,
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pinningDisabled,
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MIN_RSA_BITS_WEAK, nullptr, builtChain);
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rv = BuildCertChain(trustDomain, certDER, time,
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EndEntityOrCA::MustBeEndEntity,
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KeyUsage::digitalSignature,
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KeyPurposeId::id_kp_codeSigning,
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CertPolicyId::anyPolicy, stapledOCSPResponse);
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break;
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}
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case certificateUsageVerifyCA:
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case certificateUsageStatusResponder: {
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// XXX This is a pretty useless way to verify a certificate. It is used
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// by the certificate viewer UI. Because we don't know what trust bit is
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// interesting, we just try them all.
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mozilla::pkix::EndEntityOrCA endEntityOrCA;
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mozilla::pkix::KeyUsage keyUsage;
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KeyPurposeId eku;
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if (usage == certificateUsageVerifyCA) {
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endEntityOrCA = EndEntityOrCA::MustBeCA;
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keyUsage = KeyUsage::keyCertSign;
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eku = KeyPurposeId::anyExtendedKeyUsage;
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} else {
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endEntityOrCA = EndEntityOrCA::MustBeEndEntity;
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keyUsage = KeyUsage::digitalSignature;
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eku = KeyPurposeId::id_kp_OCSPSigning;
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}
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NSSCertDBTrustDomain sslTrust(trustSSL, ocspFetching, mOCSPCache, pinArg,
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ocspGETConfig, pinningDisabled,
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MIN_RSA_BITS_WEAK, nullptr, builtChain);
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rv = BuildCertChain(sslTrust, certDER, time, endEntityOrCA,
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keyUsage, eku, CertPolicyId::anyPolicy,
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stapledOCSPResponse);
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if (rv == Result::ERROR_UNKNOWN_ISSUER) {
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NSSCertDBTrustDomain emailTrust(trustEmail, ocspFetching, mOCSPCache,
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pinArg, ocspGETConfig, pinningDisabled,
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MIN_RSA_BITS_WEAK, nullptr, builtChain);
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rv = BuildCertChain(emailTrust, certDER, time, endEntityOrCA,
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keyUsage, eku, CertPolicyId::anyPolicy,
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stapledOCSPResponse);
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if (rv == Result::ERROR_UNKNOWN_ISSUER) {
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NSSCertDBTrustDomain objectSigningTrust(trustObjectSigning,
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ocspFetching, mOCSPCache,
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pinArg, ocspGETConfig,
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pinningDisabled,
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MIN_RSA_BITS_WEAK,
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nullptr, builtChain);
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rv = BuildCertChain(objectSigningTrust, certDER, time,
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endEntityOrCA, keyUsage, eku,
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CertPolicyId::anyPolicy, stapledOCSPResponse);
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}
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}
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break;
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}
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default:
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rv = Result::FATAL_ERROR_INVALID_ARGS;
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}
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if (rv != Success) {
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if (rv != Result::ERROR_KEY_PINNING_FAILURE &&
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usage == certificateUsageSSLServer) {
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ScopedCERTCertificate certCopy(CERT_DupCertificate(cert));
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if (!certCopy) {
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return SECFailure;
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}
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ScopedCERTCertList certList(CERT_NewCertList());
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if (!certList) {
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return SECFailure;
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}
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SECStatus srv = CERT_AddCertToListTail(certList.get(), certCopy.get());
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if (srv != SECSuccess) {
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return SECFailure;
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}
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certCopy.forget(); // now owned by certList
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Result pinningResult = CertListContainsExpectedKeys(certList, hostname,
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time, mPinningMode);
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if (pinningResult != Success) {
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rv = pinningResult;
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}
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}
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PR_SetError(MapResultToPRErrorCode(rv), 0);
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return SECFailure;
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}
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return SECSuccess;
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}
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SECStatus
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CertVerifier::VerifySSLServerCert(CERTCertificate* peerCert,
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/*optional*/ const SECItem* stapledOCSPResponse,
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Time time,
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/*optional*/ void* pinarg,
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const char* hostname,
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bool saveIntermediatesInPermanentDatabase,
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Flags flags,
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|
/*optional out*/ ScopedCERTCertList* builtChain,
|
|
/*optional out*/ SECOidTag* evOidPolicy,
|
|
/*optional out*/ OCSPStaplingStatus* ocspStaplingStatus,
|
|
/*optional out*/ KeySizeStatus* keySizeStatus)
|
|
{
|
|
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);
|
|
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 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) {
|
|
PR_SetError(MapResultToPRErrorCode(result), 0);
|
|
return SECFailure;
|
|
}
|
|
|
|
if (saveIntermediatesInPermanentDatabase) {
|
|
SaveIntermediateCerts(builtChainTemp);
|
|
}
|
|
|
|
if (builtChain) {
|
|
*builtChain = builtChainTemp.forget();
|
|
}
|
|
|
|
return SECSuccess;
|
|
}
|
|
|
|
} } // namespace mozilla::psm
|