github.com/zmap/zlint@v1.1.0/lints/lint_dnsname_wildcard_only_in_left_label.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 DNSNameWildcardOnlyInLeftlabel struct{}
    25  
    26  func (l *DNSNameWildcardOnlyInLeftlabel) Initialize() error {
    27  	return nil
    28  }
    29  
    30  func (l *DNSNameWildcardOnlyInLeftlabel) CheckApplies(c *x509.Certificate) bool {
    31  	return true
    32  }
    33  
    34  func wildcardNotInLeftLabel(domain string) bool {
    35  	labels := strings.Split(domain, ".")
    36  	if len(labels) > 1 {
    37  		labels = labels[1:]
    38  		for _, label := range labels {
    39  			if strings.Contains(label, "*") {
    40  				return true
    41  			}
    42  		}
    43  	}
    44  	return false
    45  }
    46  
    47  func (l *DNSNameWildcardOnlyInLeftlabel) Execute(c *x509.Certificate) *LintResult {
    48  	if wildcardNotInLeftLabel(c.Subject.CommonName) {
    49  		return &LintResult{Status: Error}
    50  	}
    51  	for _, dns := range c.DNSNames {
    52  		if wildcardNotInLeftLabel(dns) {
    53  			return &LintResult{Status: Error}
    54  		}
    55  	}
    56  	return &LintResult{Status: Pass}
    57  }
    58  
    59  func init() {
    60  	RegisterLint(&Lint{
    61  		Name:          "e_dnsname_wildcard_only_in_left_label",
    62  		Description:   "DNSName should not have wildcards except in the left-most label",
    63  		Citation:      "BRs: 7.1.4.2",
    64  		Source:        CABFBaselineRequirements,
    65  		EffectiveDate: util.CABEffectiveDate,
    66  		Lint:          &DNSNameWildcardOnlyInLeftlabel{},
    67  	})
    68  }