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revoked.go
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revoked.go
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// Copyright 2017 Google LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package x509util
import (
"bytes"
"encoding/hex"
"fmt"
"strconv"
"github.com/google/certificate-transparency-go/x509"
"github.com/google/certificate-transparency-go/x509/pkix"
)
// RevocationReasonToString generates a string describing a revocation reason code.
func RevocationReasonToString(reason x509.RevocationReasonCode) string {
switch reason {
case x509.Unspecified:
return "Unspecified"
case x509.KeyCompromise:
return "Key Compromise"
case x509.CACompromise:
return "CA Compromise"
case x509.AffiliationChanged:
return "Affiliation Changed"
case x509.Superseded:
return "Superseded"
case x509.CessationOfOperation:
return "Cessation Of Operation"
case x509.CertificateHold:
return "Certificate Hold"
case x509.RemoveFromCRL:
return "Remove From CRL"
case x509.PrivilegeWithdrawn:
return "Privilege Withdrawn"
case x509.AACompromise:
return "AA Compromise"
default:
return strconv.Itoa(int(reason))
}
}
// CRLToString generates a string describing the given certificate revocation list.
// The output roughly resembles that from openssl crl -text.
func CRLToString(crl *x509.CertificateList) string {
var result bytes.Buffer
var showCritical = func(critical bool) {
if critical {
result.WriteString(" critical")
}
result.WriteString("\n")
}
result.WriteString("Certificate Revocation List (CRL):\n")
result.WriteString(fmt.Sprintf(" Version: %d (%#x)\n", crl.TBSCertList.Version+1, crl.TBSCertList.Version))
result.WriteString(fmt.Sprintf(" Signature Algorithm: %v\n", x509.SignatureAlgorithmFromAI(crl.TBSCertList.Signature)))
var issuer pkix.Name
issuer.FillFromRDNSequence(&crl.TBSCertList.Issuer)
result.WriteString(fmt.Sprintf(" Issuer: %v\n", NameToString(issuer)))
result.WriteString(fmt.Sprintf(" Last Update: %v\n", crl.TBSCertList.ThisUpdate))
result.WriteString(fmt.Sprintf(" Next Update: %v\n", crl.TBSCertList.NextUpdate))
if len(crl.TBSCertList.Extensions) > 0 {
result.WriteString(" CRL extensions:\n")
}
count, critical := OIDInExtensions(x509.OIDExtensionAuthorityKeyId, crl.TBSCertList.Extensions)
if count > 0 {
result.WriteString(fmt.Sprintf(" X509v3 Authority Key Identifier:"))
showCritical(critical)
result.WriteString(fmt.Sprintf(" keyid:%v\n", hex.EncodeToString(crl.TBSCertList.AuthorityKeyID)))
}
count, critical = OIDInExtensions(x509.OIDExtensionIssuerAltName, crl.TBSCertList.Extensions)
if count > 0 {
result.WriteString(fmt.Sprintf(" X509v3 Issuer Alt Name:"))
showCritical(critical)
result.WriteString(fmt.Sprintf(" %s\n", GeneralNamesToString(&crl.TBSCertList.IssuerAltNames)))
}
count, critical = OIDInExtensions(x509.OIDExtensionCRLNumber, crl.TBSCertList.Extensions)
if count > 0 {
result.WriteString(fmt.Sprintf(" X509v3 CRLNumber:"))
showCritical(critical)
result.WriteString(fmt.Sprintf(" %d\n", crl.TBSCertList.CRLNumber))
}
count, critical = OIDInExtensions(x509.OIDExtensionDeltaCRLIndicator, crl.TBSCertList.Extensions)
if count > 0 {
result.WriteString(fmt.Sprintf(" X509v3 Delta CRL Indicator:"))
showCritical(critical)
result.WriteString(fmt.Sprintf(" %d\n", crl.TBSCertList.BaseCRLNumber))
}
count, critical = OIDInExtensions(x509.OIDExtensionIssuingDistributionPoint, crl.TBSCertList.Extensions)
if count > 0 {
result.WriteString(fmt.Sprintf(" X509v3 Issuing Distribution Point:"))
showCritical(critical)
result.WriteString(fmt.Sprintf(" %s\n", GeneralNamesToString(&crl.TBSCertList.IssuingDPFullNames)))
}
count, critical = OIDInExtensions(x509.OIDExtensionFreshestCRL, crl.TBSCertList.Extensions)
if count > 0 {
result.WriteString(fmt.Sprintf(" X509v3 Freshest CRL:"))
showCritical(critical)
result.WriteString(fmt.Sprintf(" Full Name:\n"))
var buf bytes.Buffer
for _, pt := range crl.TBSCertList.FreshestCRLDistributionPoint {
commaAppend(&buf, "URI:"+pt)
}
result.WriteString(fmt.Sprintf(" %v\n", buf.String()))
}
count, critical = OIDInExtensions(x509.OIDExtensionAuthorityInfoAccess, crl.TBSCertList.Extensions)
if count > 0 {
result.WriteString(fmt.Sprintf(" Authority Information Access:"))
showCritical(critical)
var issuerBuf bytes.Buffer
for _, issuer := range crl.TBSCertList.IssuingCertificateURL {
commaAppend(&issuerBuf, "URI:"+issuer)
}
if issuerBuf.Len() > 0 {
result.WriteString(fmt.Sprintf(" CA Issuers - %v\n", issuerBuf.String()))
}
var ocspBuf bytes.Buffer
for _, ocsp := range crl.TBSCertList.OCSPServer {
commaAppend(&ocspBuf, "URI:"+ocsp)
}
if ocspBuf.Len() > 0 {
result.WriteString(fmt.Sprintf(" OCSP - %v\n", ocspBuf.String()))
}
// TODO(drysdale): Display other GeneralName types
}
result.WriteString("\n")
result.WriteString("Revoked Certificates:\n")
for _, c := range crl.TBSCertList.RevokedCertificates {
result.WriteString(fmt.Sprintf(" Serial Number: %s (0x%s)\n", c.SerialNumber.Text(10), c.SerialNumber.Text(16)))
result.WriteString(fmt.Sprintf(" Revocation Date : %v\n", c.RevocationTime))
count, critical = OIDInExtensions(x509.OIDExtensionCRLReasons, c.Extensions)
if count > 0 {
result.WriteString(fmt.Sprintf(" X509v3 CRL Reason Code:"))
showCritical(critical)
result.WriteString(fmt.Sprintf(" %s\n", RevocationReasonToString(c.RevocationReason)))
}
count, critical = OIDInExtensions(x509.OIDExtensionInvalidityDate, c.Extensions)
if count > 0 {
result.WriteString(fmt.Sprintf(" Invalidity Date:"))
showCritical(critical)
result.WriteString(fmt.Sprintf(" %s\n", c.InvalidityDate))
}
count, critical = OIDInExtensions(x509.OIDExtensionCertificateIssuer, c.Extensions)
if count > 0 {
result.WriteString(fmt.Sprintf(" Issuer:"))
showCritical(critical)
result.WriteString(fmt.Sprintf(" %s\n", GeneralNamesToString(&c.Issuer)))
}
}
result.WriteString(fmt.Sprintf(" Signature Algorithm: %v\n", x509.SignatureAlgorithmFromAI(crl.SignatureAlgorithm)))
appendHexData(&result, crl.SignatureValue.Bytes, 18, " ")
result.WriteString("\n")
return result.String()
}