github.com/zmap/zlint@v1.1.0/lints/lint_dnsname_check_left_label_wildcard.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 DNSNameLeftLabelWildcardCheck struct{}
    25  
    26  func (l *DNSNameLeftLabelWildcardCheck) Initialize() error {
    27  	return nil
    28  }
    29  
    30  func (l *DNSNameLeftLabelWildcardCheck) CheckApplies(c *x509.Certificate) bool {
    31  	return true
    32  }
    33  
    34  func wildcardInLeftLabelIncorrect(domain string) bool {
    35  	labels := strings.Split(domain, ".")
    36  	if len(labels) >= 1 {
    37  		leftLabel := labels[0]
    38  		if strings.Contains(leftLabel, "*") && leftLabel != "*" {
    39  			return true
    40  		}
    41  	}
    42  	return false
    43  }
    44  
    45  func (l *DNSNameLeftLabelWildcardCheck) Execute(c *x509.Certificate) *LintResult {
    46  	if wildcardInLeftLabelIncorrect(c.Subject.CommonName) {
    47  		return &LintResult{Status: Error}
    48  	}
    49  	for _, dns := range c.DNSNames {
    50  		if wildcardInLeftLabelIncorrect(dns) {
    51  			return &LintResult{Status: Error}
    52  		}
    53  	}
    54  	return &LintResult{Status: Pass}
    55  }
    56  
    57  func init() {
    58  	RegisterLint(&Lint{
    59  		Name:          "e_dnsname_left_label_wildcard_correct",
    60  		Description:   "Wildcards in the left label of DNSName should only be *",
    61  		Citation:      "BRs: 7.1.4.2",
    62  		Source:        CABFBaselineRequirements,
    63  		EffectiveDate: util.CABEffectiveDate,
    64  		Lint:          &DNSNameLeftLabelWildcardCheck{},
    65  	})
    66  }