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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 (
"strings"
"github.com/zmap/zcrypto/x509"
"github.com/zmap/zlint/v3/lint"
"github.com/zmap/zlint/v3/util"
)
type DNSNameEmptyLabel struct{}
func init() {
lint.RegisterCertificateLint(&lint.CertificateLint{
LintMetadata: lint.LintMetadata{
Name: "e_rfc_dnsname_empty_label",
Description: "DNSNames should not have an empty label.",
Citation: "RFC5280: 4.2.1.6",
Source: lint.RFC5280,
EffectiveDate: util.RFC5280Date,
},
Lint: NewDNSNameEmptyLabel,
})
}
func NewDNSNameEmptyLabel() lint.LintInterface {
return &DNSNameEmptyLabel{}
}
func (l *DNSNameEmptyLabel) CheckApplies(c *x509.Certificate) bool {
return util.IsSubscriberCert(c) && util.DNSNamesExist(c)
}
func domainHasEmptyLabel(domain string) bool {
labels := strings.Split(domain, ".")
for _, elem := range labels {
if elem == "" {
return true
}
}
return false
}
func (l *DNSNameEmptyLabel) Execute(c *x509.Certificate) *lint.LintResult {
for _, dns := range c.DNSNames {
if domainHasEmptyLabel(dns) {
return &lint.LintResult{Status: lint.Error}
}
}
return &lint.LintResult{Status: lint.Pass}
}
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