gopkg.in/alecthomas/gometalinter.v3@v3.0.0/_linters/src/github.com/securego/gosec/rules/weakcrypto.go (about)

     1  // (c) Copyright 2016 Hewlett Packard Enterprise Development LP
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package rules
    16  
    17  import (
    18  	"go/ast"
    19  
    20  	"github.com/securego/gosec"
    21  )
    22  
    23  type usesWeakCryptography struct {
    24  	gosec.MetaData
    25  	blacklist map[string][]string
    26  }
    27  
    28  func (r *usesWeakCryptography) ID() string {
    29  	return r.MetaData.ID
    30  }
    31  
    32  func (r *usesWeakCryptography) Match(n ast.Node, c *gosec.Context) (*gosec.Issue, error) {
    33  	for pkg, funcs := range r.blacklist {
    34  		if _, matched := gosec.MatchCallByPackage(n, c, pkg, funcs...); matched {
    35  			return gosec.NewIssue(c, n, r.ID(), r.What, r.Severity, r.Confidence), nil
    36  		}
    37  	}
    38  	return nil, nil
    39  }
    40  
    41  // NewUsesWeakCryptography detects uses of des.* md5.* or rc4.*
    42  func NewUsesWeakCryptography(id string, conf gosec.Config) (gosec.Rule, []ast.Node) {
    43  	calls := make(map[string][]string)
    44  	calls["crypto/des"] = []string{"NewCipher", "NewTripleDESCipher"}
    45  	calls["crypto/md5"] = []string{"New", "Sum"}
    46  	calls["crypto/sha1"] = []string{"New", "Sum"}
    47  	calls["crypto/rc4"] = []string{"NewCipher"}
    48  	rule := &usesWeakCryptography{
    49  		blacklist: calls,
    50  		MetaData: gosec.MetaData{
    51  			ID:         id,
    52  			Severity:   gosec.Medium,
    53  			Confidence: gosec.High,
    54  			What:       "Use of weak cryptographic primitive",
    55  		},
    56  	}
    57  	return rule, []ast.Node{(*ast.CallExpr)(nil)}
    58  }