github.com/zmap/zlint@v1.1.0/lints/lint_dsa_shorter_than_2048_bits.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/dsa"
    19  
    20  	"github.com/zmap/zcrypto/x509"
    21  	"github.com/zmap/zlint/util"
    22  )
    23  
    24  type dsaTooShort struct{}
    25  
    26  func (l *dsaTooShort) Initialize() error {
    27  	return nil
    28  }
    29  
    30  func (l *dsaTooShort) CheckApplies(c *x509.Certificate) bool {
    31  	return c.PublicKeyAlgorithm == x509.DSA
    32  }
    33  
    34  func (l *dsaTooShort) Execute(c *x509.Certificate) *LintResult {
    35  	dsaKey, ok := c.PublicKey.(*dsa.PublicKey)
    36  	if !ok {
    37  		return &LintResult{Status: NA}
    38  	}
    39  	dsaParams := dsaKey.Parameters
    40  	L := dsaParams.P.BitLen()
    41  	N := dsaParams.Q.BitLen()
    42  	if L >= 2048 && N >= 244 {
    43  		return &LintResult{Status: Pass}
    44  	}
    45  	return &LintResult{Status: Error}
    46  }
    47  
    48  func init() {
    49  	RegisterLint(&Lint{
    50  		Name:        "e_dsa_shorter_than_2048_bits",
    51  		Description: "DSA modulus size must be at least 2048 bits",
    52  		Citation:    "BRs: 6.1.5",
    53  		// Refer to BRs: 6.1.5, taking the statement "Before 31 Dec 2010" literally
    54  		Source:        CABFBaselineRequirements,
    55  		EffectiveDate: util.ZeroDate,
    56  		Lint:          &dsaTooShort{},
    57  	})
    58  }