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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"
"golang.org/x/text/unicode/norm"
)
type ExtCertPolicyExplicitTextNotNFC struct{}
/************************************************
When the UTF8String encoding is used, all character sequences SHOULD be
normalized according to Unicode normalization form C (NFC) [NFC].
************************************************/
func init() {
lint.RegisterCertificateLint(&lint.CertificateLint{
LintMetadata: lint.LintMetadata{
Name: "w_ext_cert_policy_explicit_text_not_nfc",
Description: "When utf8string or bmpstring encoding is used for explicitText field in certificate policy, it SHOULD be normalized by NFC format",
Citation: "RFC6181 3",
Source: lint.RFC5280,
EffectiveDate: util.RFC6818Date,
},
Lint: NewExtCertPolicyExplicitTextNotNFC,
})
}
func NewExtCertPolicyExplicitTextNotNFC() lint.LintInterface {
return &ExtCertPolicyExplicitTextNotNFC{}
}
func (l *ExtCertPolicyExplicitTextNotNFC) CheckApplies(c *x509.Certificate) bool {
for _, text := range c.ExplicitTexts {
if text != nil {
return true
}
}
return false
}
func (l *ExtCertPolicyExplicitTextNotNFC) Execute(c *x509.Certificate) *lint.LintResult {
for _, firstLvl := range c.ExplicitTexts {
for _, text := range firstLvl {
if text.Tag == 12 || text.Tag == 30 {
if !norm.NFC.IsNormal(text.Bytes) {
return &lint.LintResult{Status: lint.Warn}
}
}
}
}
return &lint.LintResult{Status: lint.Pass}
}
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