github.com/zmap/zlint@v1.1.0/lints/lint_spki_rsa_encryption_parameter_not_null.go (about)

     1  package lints
     2  
     3  /*
     4   * ZLint Copyright 2019 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  "RFC5280: RFC 4055, Section 1.2"
    19  RSA: Encoded algorithm identifier MUST have NULL parameters.
    20  *******************************************************************************************************/
    21  
    22  import (
    23  	"fmt"
    24  
    25  	"github.com/zmap/zcrypto/x509"
    26  	"github.com/zmap/zlint/util"
    27  	"golang.org/x/crypto/cryptobyte"
    28  	cryptobyte_asn1 "golang.org/x/crypto/cryptobyte/asn1"
    29  )
    30  
    31  type rsaSPKIEncryptionParamNotNULL struct{}
    32  
    33  func (l *rsaSPKIEncryptionParamNotNULL) Initialize() error {
    34  	return nil
    35  }
    36  
    37  func (l *rsaSPKIEncryptionParamNotNULL) CheckApplies(c *x509.Certificate) bool {
    38  	// explicitly check for util.OidRSAEncryption, as RSA-PSS or RSA-OAEP certificates might be classified with c.PublicKeyAlgorithm = RSA
    39  	return c.PublicKeyAlgorithmOID.Equal(util.OidRSAEncryption)
    40  }
    41  
    42  func (l *rsaSPKIEncryptionParamNotNULL) Execute(c *x509.Certificate) *LintResult {
    43  	input := cryptobyte.String(c.RawSubjectPublicKeyInfo)
    44  
    45  	var publicKeyInfo cryptobyte.String
    46  	if !input.ReadASN1(&publicKeyInfo, cryptobyte_asn1.SEQUENCE) {
    47  		return &LintResult{Status: Fatal, Details: "error reading pkixPublicKey"}
    48  	}
    49  
    50  	var algorithm cryptobyte.String
    51  	var tag cryptobyte_asn1.Tag
    52  	// use ReadAnyElement to preserve tag and length octets
    53  	if !publicKeyInfo.ReadAnyASN1Element(&algorithm, &tag) {
    54  		return &LintResult{Status: Fatal, Details: "error reading pkixPublicKey"}
    55  	}
    56  
    57  	if err := util.CheckAlgorithmIDParamNotNULL(algorithm, util.OidRSAEncryption); err != nil {
    58  		return &LintResult{Status: Error, Details: fmt.Sprintf("certificate pkixPublicKey %s", err.Error())}
    59  	}
    60  
    61  	return &LintResult{Status: Pass}
    62  }
    63  
    64  func init() {
    65  	RegisterLint(&Lint{
    66  		Name:          "e_spki_rsa_encryption_parameter_not_null",
    67  		Description:   "RSA: Encoded public key algorithm identifier MUST have NULL parameters",
    68  		Citation:      "RFC 4055, Section 1.2",
    69  		Source:        RFC5280, // RFC4055 is referenced in RFC5280, Section 1
    70  		EffectiveDate: util.RFC5280Date,
    71  		Lint:          &rsaSPKIEncryptionParamNotNULL{},
    72  	})
    73  }