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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 (
"github.com/zmap/zcrypto/x509"
"github.com/zmap/zlint/v3/lint"
"github.com/zmap/zlint/v3/util"
)
type IANDNSNotIA5String struct{}
/********************************************************************
RFC 5280: 4.2.1.7
When the subjectAltName extension contains a domain name system
label, the domain name MUST be stored in the DNSName (an IA5String).
The name MUST be in the "preferred name syntax", as specified by
Section 3.5 of [RFC1034] and as modified by Section 2.1 of
[RFC1123]. Note that while uppercase and lowercase letters are
allowed in domain names, no significance is attached to the case. In
addition, while the string " " is a legal domain name, subjectAltName
extensions with a DNSName of " " MUST NOT be used. Finally, the use
of the DNS representation for Internet mail addresses
(subscriber.example.com instead of subscriber@example.com) MUST NOT
be used; such identities are to be encoded as rfc822Name. Rules for
encoding internationalized domain names are specified in Section 7.2.
********************************************************************/
func init() {
lint.RegisterCertificateLint(&lint.CertificateLint{
LintMetadata: lint.LintMetadata{
Name: "e_ext_ian_dns_not_ia5_string",
Description: "DNSNames MUST be IA5 strings",
Citation: "RFC 5280: 4.2.1.7",
Source: lint.RFC5280,
EffectiveDate: util.RFC2459Date,
},
Lint: NewIANDNSNotIA5String,
})
}
func NewIANDNSNotIA5String() lint.LintInterface {
return &IANDNSNotIA5String{}
}
func (l *IANDNSNotIA5String) CheckApplies(c *x509.Certificate) bool {
return util.IsExtInCert(c, util.IssuerAlternateNameOID)
}
func (l *IANDNSNotIA5String) Execute(c *x509.Certificate) *lint.LintResult {
ext := util.GetExtFromCert(c, util.IssuerAlternateNameOID)
if ext == nil {
return &lint.LintResult{Status: lint.Fatal}
}
ok, err := util.AllAlternateNameWithTagAreIA5(ext, util.DNSNameTag)
if err != nil {
return &lint.LintResult{Status: lint.Fatal}
}
if ok {
return &lint.LintResult{Status: lint.Pass}
} else {
return &lint.LintResult{Status: lint.Error}
}
}
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