github.com/zmap/zlint@v1.1.0/lints/lint_is_redacted_cert.go (about)

     1  package lints
     2  
     3  /*
     4   * ZLint Copyright 2018 Regents of the University of Michigan
     5   *
     6   * Licensed under the Apache License, Version 2.0 (the "License"); you may not
     7   * use this file except in compliance with the License. You may obtain a copy
     8   * of the License at http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
    13   * implied. See the License for the specific language governing
    14   * permissions and limitations under the License.
    15   */
    16  
    17  import (
    18  	"strings"
    19  
    20  	"github.com/zmap/zcrypto/x509"
    21  	"github.com/zmap/zlint/util"
    22  )
    23  
    24  type DNSNameRedacted struct{}
    25  
    26  func (l *DNSNameRedacted) Initialize() error {
    27  	return nil
    28  }
    29  
    30  func (l *DNSNameRedacted) CheckApplies(c *x509.Certificate) bool {
    31  	return util.IsSubscriberCert(c)
    32  }
    33  
    34  func isRedactedCertificate(domain string) bool {
    35  	domain = util.RemovePrependedWildcard(domain)
    36  	return strings.HasPrefix(domain, "?.")
    37  }
    38  
    39  func (l *DNSNameRedacted) Execute(c *x509.Certificate) *LintResult {
    40  	if c.Subject.CommonName != "" {
    41  		if isRedactedCertificate(c.Subject.CommonName) {
    42  			return &LintResult{Status: Notice}
    43  		}
    44  	}
    45  	for _, domain := range c.DNSNames {
    46  		if isRedactedCertificate(domain) {
    47  			return &LintResult{Status: Notice}
    48  		}
    49  	}
    50  	return &LintResult{Status: Pass}
    51  }
    52  
    53  func init() {
    54  	RegisterLint(&Lint{
    55  		Name:          "n_contains_redacted_dnsname",
    56  		Description:   "Some precerts are redacted and of the form ?.?.a.com or *.?.a.com",
    57  		Source:        ZLint,
    58  		Citation:      "IETF Draft: https://tools.ietf.org/id/draft-strad-trans-redaction-00.html",
    59  		EffectiveDate: util.ZeroDate,
    60  		Lint:          &DNSNameRedacted{},
    61  	})
    62  }