github.com/zmap/zlint@v1.1.0/lints/lint_rsa_exp_negative.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  	"crypto/rsa"
    19  
    20  	"github.com/zmap/zcrypto/x509"
    21  	"github.com/zmap/zlint/util"
    22  )
    23  
    24  type rsaExpNegative struct{}
    25  
    26  func (l *rsaExpNegative) Initialize() error {
    27  	return nil
    28  }
    29  
    30  func (l *rsaExpNegative) CheckApplies(c *x509.Certificate) bool {
    31  	_, ok := c.PublicKey.(*rsa.PublicKey)
    32  	return ok && c.PublicKeyAlgorithm == x509.RSA
    33  }
    34  
    35  func (l *rsaExpNegative) Execute(c *x509.Certificate) *LintResult {
    36  	key := c.PublicKey.(*rsa.PublicKey)
    37  	if key.E < 0 {
    38  		return &LintResult{Status: Error}
    39  	}
    40  	return &LintResult{Status: Pass}
    41  }
    42  
    43  func init() {
    44  	RegisterLint(&Lint{
    45  		Name:          "e_rsa_exp_negative",
    46  		Description:   "RSA public key exponent MUST be positive",
    47  		Citation:      "awslabs certlint",
    48  		Source:        AWSLabs,
    49  		EffectiveDate: util.ZeroDate,
    50  		Lint:          &rsaExpNegative{},
    51  	})
    52  }