1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
// 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Superseded:
return "Superseded"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return "Privilege Withdrawn"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(" 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(" 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(" 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(" 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(" 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(" X509v3 Freshest CRL:")
showCritical(critical)
result.WriteString(" 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(" 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(" 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(" Invalidity Date:")
showCritical(critical)
result.WriteString(fmt.Sprintf(" %s\n", c.InvalidityDate))
}
count, critical = OIDInExtensions(x509.OIDExtensionCertificateIssuer, c.Extensions)
if count > 0 {
result.WriteString(" 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()
}
|
