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75 lines
2.7 KiB
C++
75 lines
2.7 KiB
C++
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// Copyright (c) 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "net/cert/internal/revocation_checker.h"
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#include <string>
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#include "base/strings/string_piece.h"
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#include "crypto/sha2.h"
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#include "net/cert/internal/common_cert_errors.h"
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#include "net/cert/internal/parsed_certificate.h"
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namespace net {
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CRLSet::Result CheckChainRevocationUsingCRLSet(
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const CRLSet* crl_set,
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const ParsedCertificateList& certs,
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CertPathErrors* errors) {
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// Iterate from the root certificate towards the leaf (the root certificate is
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// also checked for revocation by CRLSet).
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std::string issuer_spki_hash;
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for (size_t reverse_i = 0; reverse_i < certs.size(); ++reverse_i) {
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size_t i = certs.size() - reverse_i - 1;
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const ParsedCertificate* cert = certs[i].get();
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// True if |cert| is the root of the chain.
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const bool is_root = reverse_i == 0;
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// True if |cert| is the leaf certificate of the chain.
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const bool is_target = i == 0;
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// Check for revocation using the certificate's SPKI.
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std::string spki_hash =
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crypto::SHA256HashString(cert->tbs().spki_tlv.AsStringPiece());
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CRLSet::Result result = crl_set->CheckSPKI(spki_hash);
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// Check for revocation using the certificate's serial number and issuer's
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// SPKI.
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if (result != CRLSet::REVOKED && !is_root) {
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result = crl_set->CheckSerial(cert->tbs().serial_number.AsStringPiece(),
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issuer_spki_hash);
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}
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// Prepare for the next iteration.
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issuer_spki_hash = std::move(spki_hash);
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switch (result) {
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case CRLSet::REVOKED:
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errors->GetErrorsForCert(i)->AddError(cert_errors::kCertificateRevoked);
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return CRLSet::Result::REVOKED;
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case CRLSet::UNKNOWN:
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// If the status is unknown, advance to the subordinate certificate.
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break;
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case CRLSet::GOOD:
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if (is_target && !crl_set->IsExpired()) {
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// If the target is covered by the CRLSet and known good, consider
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// the entire chain to be valid (even though the revocation status
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// of the intermediates may have been UNKNOWN).
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//
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// Only the leaf certificate is considered for coverage because some
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// intermediates have CRLs with no revocations (after filtering) and
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// those CRLs are pruned from the CRLSet at generation time.
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return CRLSet::Result::GOOD;
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}
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break;
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}
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}
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// If no certificate was revoked, and the target was not known good, then
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// the revocation status is still unknown.
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return CRLSet::Result::UNKNOWN;
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}
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} // namespace net
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