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
|
package rfc
/*
* ZLint Copyright 2024 Regents of the University of Michigan
*
* 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.
*/
import (
"fmt"
"github.com/zmap/zcrypto/x509"
"github.com/zmap/zlint/v3/lint"
"github.com/zmap/zlint/v3/util"
"golang.org/x/crypto/cryptobyte"
cryptobyte_asn1 "golang.org/x/crypto/cryptobyte/asn1"
)
type rsaTBSSignatureEncryptionParamNotNULL struct{}
/*******************************************************************************************************
"RFC5280: RFC 4055, Section 5"
RSA: Encoded algorithm identifier MUST have NULL parameters.
*******************************************************************************************************/
func init() {
lint.RegisterCertificateLint(&lint.CertificateLint{
LintMetadata: lint.LintMetadata{
Name: "e_tbs_signature_rsa_encryption_parameter_not_null",
Description: "RSA: Encoded signature algorithm identifier MUST have NULL parameters",
Citation: "RFC 4055, Section 5",
Source: lint.RFC5280, // RFC4055 is referenced in RFC5280, Section 1
EffectiveDate: util.RFC5280Date,
},
Lint: NewRsaTBSSignatureEncryptionParamNotNULL,
})
}
func NewRsaTBSSignatureEncryptionParamNotNULL() lint.LintInterface {
return &rsaTBSSignatureEncryptionParamNotNULL{}
}
func (l *rsaTBSSignatureEncryptionParamNotNULL) CheckApplies(c *x509.Certificate) bool {
_, ok := util.RSAAlgorithmIDToDER[c.SignatureAlgorithmOID.String()]
return ok
}
func (l *rsaTBSSignatureEncryptionParamNotNULL) Execute(c *x509.Certificate) *lint.LintResult {
input := cryptobyte.String(c.RawTBSCertificate)
var tbsCert cryptobyte.String
if !input.ReadASN1(&tbsCert, cryptobyte_asn1.SEQUENCE) {
return &lint.LintResult{Status: lint.Fatal, Details: "error reading tbsCertificate"}
}
if !tbsCert.SkipOptionalASN1(cryptobyte_asn1.Tag(0).Constructed().ContextSpecific()) {
return &lint.LintResult{Status: lint.Fatal, Details: "error reading tbsCertificate.version"}
}
if !tbsCert.SkipASN1(cryptobyte_asn1.INTEGER) {
return &lint.LintResult{Status: lint.Fatal, Details: "error reading tbsCertificate.serialNumber"}
}
var signatureAlgoID cryptobyte.String
var tag cryptobyte_asn1.Tag
// use ReadAnyElement to preserve tag and length octets
if !tbsCert.ReadAnyASN1Element(&signatureAlgoID, &tag) {
return &lint.LintResult{Status: lint.Fatal, Details: "error reading tbsCertificate.signature"}
}
if err := util.CheckAlgorithmIDParamNotNULL(signatureAlgoID, c.SignatureAlgorithmOID); err != nil {
return &lint.LintResult{Status: lint.Error, Details: fmt.Sprintf("certificate tbsCertificate.signature %s", err.Error())}
}
return &lint.LintResult{Status: lint.Pass}
}
|
