github.com/zmap/zlint@v1.1.0/lints/lint_root_ca_basic_constraints_path_len_constraint_field_present.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  7.1.2.1. Root CA Certificate
    19  a. basicConstraints
    20  This extension MUST appear as a critical extension. The cA field MUST be set true. The pathLenConstraint field SHOULD NOT be present.
    21  ***********************************************************************************************************/
    22  
    23  import (
    24  	"encoding/asn1"
    25  
    26  	"github.com/zmap/zcrypto/x509"
    27  	"github.com/zmap/zlint/util"
    28  )
    29  
    30  type rootCaPathLenPresent struct{}
    31  
    32  func (l *rootCaPathLenPresent) Initialize() error {
    33  	return nil
    34  }
    35  
    36  func (l *rootCaPathLenPresent) CheckApplies(c *x509.Certificate) bool {
    37  	return util.IsRootCA(c) && util.IsExtInCert(c, util.BasicConstOID)
    38  }
    39  
    40  func (l *rootCaPathLenPresent) Execute(c *x509.Certificate) *LintResult {
    41  	bc := util.GetExtFromCert(c, util.BasicConstOID)
    42  	var seq asn1.RawValue
    43  	var isCa bool
    44  	_, err := asn1.Unmarshal(bc.Value, &seq)
    45  	if err != nil {
    46  		return &LintResult{Status: Fatal}
    47  	}
    48  	if len(seq.Bytes) == 0 {
    49  		return &LintResult{Status: Pass}
    50  	}
    51  	rest, err := asn1.Unmarshal(seq.Bytes, &isCa)
    52  	if err != nil {
    53  		return &LintResult{Status: Fatal}
    54  	}
    55  	if len(rest) > 0 {
    56  		return &LintResult{Status: Warn}
    57  	}
    58  	return &LintResult{Status: Pass}
    59  }
    60  
    61  func init() {
    62  	RegisterLint(&Lint{
    63  		Name:          "w_root_ca_basic_constraints_path_len_constraint_field_present",
    64  		Description:   "Root CA certificate basicConstraint extension pathLenConstraint field SHOULD NOT be present",
    65  		Citation:      "BRs: 7.1.2.1",
    66  		Source:        CABFBaselineRequirements,
    67  		EffectiveDate: util.CABEffectiveDate,
    68  		Lint:          &rootCaPathLenPresent{},
    69  	})
    70  }