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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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 "WebTransportCertificateVerifier.h"
#include "ScopedNSSTypes.h"
#include "nss/mozpkix/pkixutil.h"
#include "nss/mozpkix/pkixcheck.h"
#include "hasht.h"
namespace mozilla::psm {
class ServerCertHashesTrustDomain : public mozilla::pkix::TrustDomain {
public:
ServerCertHashesTrustDomain() = default;
virtual mozilla::pkix::Result FindIssuer(
mozilla::pkix::Input encodedIssuerName, IssuerChecker& checker,
mozilla::pkix::Time time) override;
virtual mozilla::pkix::Result GetCertTrust(
mozilla::pkix::EndEntityOrCA endEntityOrCA,
const mozilla::pkix::CertPolicyId& policy,
mozilla::pkix::Input candidateCertDER,
/*out*/ mozilla::pkix::TrustLevel& trustLevel) override;
virtual mozilla::pkix::Result CheckSignatureDigestAlgorithm(
mozilla::pkix::DigestAlgorithm digestAlg,
mozilla::pkix::EndEntityOrCA endEntityOrCA,
mozilla::pkix::Time notBefore) override;
virtual mozilla::pkix::Result CheckRSAPublicKeyModulusSizeInBits(
mozilla::pkix::EndEntityOrCA endEntityOrCA,
unsigned int modulusSizeInBits) override;
virtual mozilla::pkix::Result VerifyRSAPKCS1SignedData(
mozilla::pkix::Input data, mozilla::pkix::DigestAlgorithm digestAlgorithm,
mozilla::pkix::Input signature,
mozilla::pkix::Input subjectPublicKeyInfo) override;
virtual mozilla::pkix::Result VerifyRSAPSSSignedData(
mozilla::pkix::Input data, mozilla::pkix::DigestAlgorithm digestAlgorithm,
mozilla::pkix::Input signature,
mozilla::pkix::Input subjectPublicKeyInfo) override;
virtual mozilla::pkix::Result CheckECDSACurveIsAcceptable(
mozilla::pkix::EndEntityOrCA endEntityOrCA,
mozilla::pkix::NamedCurve curve) override;
virtual mozilla::pkix::Result VerifyECDSASignedData(
mozilla::pkix::Input data, mozilla::pkix::DigestAlgorithm digestAlgorithm,
mozilla::pkix::Input signature,
mozilla::pkix::Input subjectPublicKeyInfo) override;
virtual mozilla::pkix::Result DigestBuf(
mozilla::pkix::Input item, mozilla::pkix::DigestAlgorithm digestAlg,
/*out*/ uint8_t* digestBuf, size_t digestBufLen) override;
virtual mozilla::pkix::Result CheckValidityIsAcceptable(
mozilla::pkix::Time notBefore, mozilla::pkix::Time notAfter,
mozilla::pkix::EndEntityOrCA endEntityOrCA,
mozilla::pkix::KeyPurposeId keyPurpose) override;
virtual mozilla::pkix::Result NetscapeStepUpMatchesServerAuth(
mozilla::pkix::Time notBefore,
/*out*/ bool& matches) override;
virtual mozilla::pkix::Result CheckRevocation(
mozilla::pkix::EndEntityOrCA endEntityOrCA,
const mozilla::pkix::CertID& certID, mozilla::pkix::Time time,
mozilla::pkix::Duration validityDuration,
/*optional*/ const mozilla::pkix::Input* stapledOCSPResponse,
/*optional*/ const mozilla::pkix::Input* aiaExtension,
/*optional*/ const mozilla::pkix::Input* sctExtension) override;
virtual mozilla::pkix::Result IsChainValid(
const mozilla::pkix::DERArray& certChain, mozilla::pkix::Time time,
const mozilla::pkix::CertPolicyId& requiredPolicy) override;
virtual void NoteAuxiliaryExtension(
mozilla::pkix::AuxiliaryExtension extension,
mozilla::pkix::Input extensionData) override;
};
mozilla::pkix::Result ServerCertHashesTrustDomain::FindIssuer(
mozilla::pkix::Input encodedIssuerName, IssuerChecker& checker,
mozilla::pkix::Time time) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result ServerCertHashesTrustDomain::GetCertTrust(
mozilla::pkix::EndEntityOrCA endEntityOrCA,
const mozilla::pkix::CertPolicyId& policy,
mozilla::pkix::Input candidateCertDER,
/*out*/ mozilla::pkix::TrustLevel& trustLevel) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result
ServerCertHashesTrustDomain::CheckSignatureDigestAlgorithm(
mozilla::pkix::DigestAlgorithm digestAlg,
mozilla::pkix::EndEntityOrCA endEntityOrCA, mozilla::pkix::Time notBefore) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result
ServerCertHashesTrustDomain::CheckRSAPublicKeyModulusSizeInBits(
mozilla::pkix::EndEntityOrCA endEntityOrCA,
unsigned int modulusSizeInBits) {
return mozilla::pkix::Result::
ERROR_UNSUPPORTED_KEYALG; // RSA is not supported for
// serverCertificateHashes,
// Chromium does only support it for an intermediate period due to spec
// change, we do not support it.
}
mozilla::pkix::Result ServerCertHashesTrustDomain::VerifyRSAPKCS1SignedData(
mozilla::pkix::Input data, mozilla::pkix::DigestAlgorithm digestAlgorithm,
mozilla::pkix::Input signature, mozilla::pkix::Input subjectPublicKeyInfo) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result ServerCertHashesTrustDomain::VerifyRSAPSSSignedData(
mozilla::pkix::Input data, mozilla::pkix::DigestAlgorithm digestAlgorithm,
mozilla::pkix::Input signature, mozilla::pkix::Input subjectPublicKeyInfo) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result ServerCertHashesTrustDomain::CheckECDSACurveIsAcceptable(
mozilla::pkix::EndEntityOrCA endEntityOrCA,
mozilla::pkix::NamedCurve curve) {
return mozilla::pkix::Result::Success;
}
mozilla::pkix::Result ServerCertHashesTrustDomain::VerifyECDSASignedData(
mozilla::pkix::Input data, mozilla::pkix::DigestAlgorithm digestAlgorithm,
mozilla::pkix::Input signature, mozilla::pkix::Input subjectPublicKeyInfo) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result ServerCertHashesTrustDomain::DigestBuf(
mozilla::pkix::Input item, mozilla::pkix::DigestAlgorithm digestAlg,
/*out*/ uint8_t* digestBuf, size_t digestBufLen) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result ServerCertHashesTrustDomain::CheckValidityIsAcceptable(
mozilla::pkix::Time notBefore, mozilla::pkix::Time notAfter,
mozilla::pkix::EndEntityOrCA endEntityOrCA,
mozilla::pkix::KeyPurposeId keyPurpose) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result
ServerCertHashesTrustDomain::NetscapeStepUpMatchesServerAuth(
mozilla::pkix::Time notBefore,
/*out*/ bool& matches) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result ServerCertHashesTrustDomain::CheckRevocation(
mozilla::pkix::EndEntityOrCA endEntityOrCA,
const mozilla::pkix::CertID& certID, mozilla::pkix::Time time,
mozilla::pkix::Duration validityDuration,
/*optional*/ const mozilla::pkix::Input* stapledOCSPResponse,
/*optional*/ const mozilla::pkix::Input* aiaExtension,
/*optional*/ const mozilla::pkix::Input* sctExtension) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
mozilla::pkix::Result ServerCertHashesTrustDomain::IsChainValid(
const mozilla::pkix::DERArray& certChain, mozilla::pkix::Time time,
const mozilla::pkix::CertPolicyId& requiredPolicy) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
return mozilla::pkix::Result::FATAL_ERROR_LIBRARY_FAILURE;
}
void ServerCertHashesTrustDomain::NoteAuxiliaryExtension(
mozilla::pkix::AuxiliaryExtension extension,
mozilla::pkix::Input extensionData) {
MOZ_ASSERT_UNREACHABLE("not expecting this to be called");
}
} // namespace mozilla::psm
namespace mozilla::net {
// Does certificate verificate as required for serverCertificateHashes
// This function is currently only used for Quic, but may be used later also for
// http/2
mozilla::pkix::Result AuthCertificateWithServerCertificateHashes(
nsTArray<uint8_t>& peerCert,
const nsTArray<RefPtr<nsIWebTransportHash>>& aServerCertHashes) {
using namespace mozilla::pkix;
Input certDER;
mozilla::pkix::Result rv =
certDER.Init(peerCert.Elements(), peerCert.Length());
if (rv != Success) {
return rv;
}
BackCert cert(certDER, EndEntityOrCA::MustBeEndEntity, nullptr);
rv = cert.Init();
if (rv != Success) {
return rv;
}
Time notBefore(Time::uninitialized);
Time notAfter(Time::uninitialized);
rv = ParseValidity(cert.GetValidity(), ¬Before, ¬After);
if (rv != Success) {
return rv;
}
// now we check that validity is not greater than 14 days
Duration certDuration(notBefore, notAfter);
if (certDuration > Duration(60 * 60 * 24 * 14)) {
return mozilla::pkix::Result::ERROR_VALIDITY_TOO_LONG;
}
Time now = Now();
// and if the certificate is actually valid?
rv = CheckValidity(now, notBefore, notAfter);
if (rv != Success) {
return rv;
}
mozilla::psm::ServerCertHashesTrustDomain trustDomain;
rv = CheckSubjectPublicKeyInfo(
cert.GetSubjectPublicKeyInfo(), trustDomain,
EndEntityOrCA::MustBeEndEntity /* should be ignored*/);
if (rv != Success) {
return rv;
}
// ok now the final check, calculate the hash and compare it:
// https://w3c.github.io/webtransport/#compute-a-certificate-hash
nsTArray<uint8_t> certHash;
if (NS_FAILED(Digest::DigestBuf(SEC_OID_SHA256, peerCert, certHash)) ||
certHash.Length() != SHA256_LENGTH) {
return mozilla::pkix::Result::ERROR_INVALID_ALGORITHM;
}
// https://w3c.github.io/webtransport/#verify-a-certificate-hash
for (const auto& hash : aServerCertHashes) {
nsCString algorithm;
if (NS_FAILED(hash->GetAlgorithm(algorithm)) || algorithm != "sha-256") {
continue;
}
nsTArray<uint8_t> value;
if (NS_FAILED(hash->GetValue(value))) {
continue;
}
if (certHash == value) {
return Success;
}
}
return mozilla::pkix::Result::ERROR_UNTRUSTED_CERT;
}
} // namespace mozilla::net
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