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/*
* 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.
*/
package rfc
import (
"unicode/utf8"
"github.com/zmap/zcrypto/encoding/asn1"
"github.com/zmap/zcrypto/x509"
"github.com/zmap/zlint/v3/lint"
"github.com/zmap/zlint/v3/util"
)
type subjectDNNotPrintableCharacters struct{}
func init() {
lint.RegisterCertificateLint(&lint.CertificateLint{
LintMetadata: lint.LintMetadata{
Name: "e_subject_dn_not_printable_characters",
Description: "X520 Subject fields MUST only contain printable control characters",
Citation: "RFC 5280: Appendix A",
Source: lint.RFC5280,
EffectiveDate: util.ZeroDate,
},
Lint: NewSubjectDNNotPrintableCharacters,
})
}
func NewSubjectDNNotPrintableCharacters() lint.LintInterface {
return &subjectDNNotPrintableCharacters{}
}
func (l *subjectDNNotPrintableCharacters) CheckApplies(c *x509.Certificate) bool {
return true
}
func (l *subjectDNNotPrintableCharacters) Execute(c *x509.Certificate) *lint.LintResult {
rdnSequence := util.RawRDNSequence{}
rest, err := asn1.Unmarshal(c.RawSubject, &rdnSequence)
if err != nil {
return &lint.LintResult{Status: lint.Fatal}
}
if len(rest) > 0 {
return &lint.LintResult{Status: lint.Fatal}
}
for _, attrTypeAndValueSet := range rdnSequence {
for _, attrTypeAndValue := range attrTypeAndValueSet {
bytes := attrTypeAndValue.Value.Bytes
for len(bytes) > 0 {
r, size := utf8.DecodeRune(bytes)
if r < 0x20 {
return &lint.LintResult{Status: lint.Error}
}
if r >= 0x7F && r <= 0x9F {
return &lint.LintResult{Status: lint.Error}
}
bytes = bytes[size:]
}
}
}
return &lint.LintResult{Status: lint.Pass}
}
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