github.com/zmap/zlint@v1.1.0/lints/lint_ext_ian_no_entries.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  RFC 5280: 4.2.1.7
    19  If the issuerAltName extension is present, the sequence MUST contain
    20     at least one entry.  Unlike the subject field, conforming CAs MUST
    21     NOT issue certificates with subjectAltNames containing empty
    22     GeneralName fields.  For example, an rfc822Name is represented as an
    23     IA5String.  While an empty string is a valid IA5String, such an
    24     rfc822Name is not permitted by this profile.  The behavior of clients
    25     that encounter such a certificate when processing a certification
    26     path is not defined by this profile.
    27  ***********************************************************************/
    28  
    29  import (
    30  	"github.com/zmap/zcrypto/x509"
    31  	"github.com/zmap/zlint/util"
    32  )
    33  
    34  type IANNoEntry struct{}
    35  
    36  func (l *IANNoEntry) Initialize() error {
    37  	return nil
    38  }
    39  
    40  func (l *IANNoEntry) CheckApplies(c *x509.Certificate) bool {
    41  	return util.IsExtInCert(c, util.IssuerAlternateNameOID)
    42  }
    43  
    44  func (l *IANNoEntry) Execute(c *x509.Certificate) *LintResult {
    45  	ian := util.GetExtFromCert(c, util.IssuerAlternateNameOID)
    46  	if util.IsEmptyASN1Sequence(ian.Value) {
    47  		return &LintResult{Status: Error}
    48  	} else {
    49  		return &LintResult{Status: Pass}
    50  	}
    51  }
    52  
    53  func init() {
    54  	RegisterLint(&Lint{
    55  		Name:          "e_ext_ian_no_entries",
    56  		Description:   "If present, the IAN extension must contain at least one entry",
    57  		Citation:      "RFC 5280: 4.2.1.7",
    58  		Source:        RFC5280,
    59  		EffectiveDate: util.RFC2459Date,
    60  		Lint:          &IANNoEntry{},
    61  	})
    62  }