github.com/zmap/zlint@v1.1.0/lints/lint_subject_common_name_not_from_san.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  /************************************************
    18  BRs: 7.1.4.2.2
    19  If present, this field MUST contain a single IP address
    20  or Fully‐Qualified Domain Name that is one of the values
    21  contained in the Certificate’s subjectAltName extension (see Section 7.1.4.2.1).
    22  ************************************************/
    23  
    24  import (
    25  	"strings"
    26  
    27  	"github.com/zmap/zcrypto/x509"
    28  	"github.com/zmap/zlint/util"
    29  )
    30  
    31  type subjectCommonNameNotFromSAN struct{}
    32  
    33  func (l *subjectCommonNameNotFromSAN) Initialize() error {
    34  	return nil
    35  }
    36  
    37  func (l *subjectCommonNameNotFromSAN) CheckApplies(c *x509.Certificate) bool {
    38  	return c.Subject.CommonName != "" && !util.IsCACert(c)
    39  }
    40  
    41  func (l *subjectCommonNameNotFromSAN) Execute(c *x509.Certificate) *LintResult {
    42  	cn := c.Subject.CommonName
    43  
    44  	for _, dn := range c.DNSNames {
    45  		if strings.EqualFold(cn, dn) {
    46  			return &LintResult{Status: Pass}
    47  		}
    48  	}
    49  
    50  	for _, ip := range c.IPAddresses {
    51  		if cn == ip.String() {
    52  			return &LintResult{Status: Pass}
    53  		}
    54  	}
    55  
    56  	return &LintResult{Status: Error}
    57  }
    58  
    59  func init() {
    60  	RegisterLint(&Lint{
    61  		Name:          "e_subject_common_name_not_from_san",
    62  		Description:   "The common name field in subscriber certificates must include only names from the SAN extension",
    63  		Citation:      "BRs: 7.1.4.2.2",
    64  		Source:        CABFBaselineRequirements,
    65  		EffectiveDate: util.CABEffectiveDate,
    66  		Lint:          &subjectCommonNameNotFromSAN{},
    67  	})
    68  }