gopkg.in/alecthomas/gometalinter.v3@v3.0.0/_linters/src/github.com/securego/gosec/rules/rand.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 weakRand struct { 24 gosec.MetaData 25 funcNames []string 26 packagePath string 27 } 28 29 func (w *weakRand) ID() string { 30 return w.MetaData.ID 31 } 32 33 func (w *weakRand) Match(n ast.Node, c *gosec.Context) (*gosec.Issue, error) { 34 for _, funcName := range w.funcNames { 35 if _, matched := gosec.MatchCallByPackage(n, c, w.packagePath, funcName); matched { 36 return gosec.NewIssue(c, n, w.ID(), w.What, w.Severity, w.Confidence), nil 37 } 38 } 39 40 return nil, nil 41 } 42 43 // NewWeakRandCheck detects the use of random number generator that isn't cryptographically secure 44 func NewWeakRandCheck(id string, conf gosec.Config) (gosec.Rule, []ast.Node) { 45 return &weakRand{ 46 funcNames: []string{"Read", "Int"}, 47 packagePath: "math/rand", 48 MetaData: gosec.MetaData{ 49 ID: id, 50 Severity: gosec.High, 51 Confidence: gosec.Medium, 52 What: "Use of weak random number generator (math/rand instead of crypto/rand)", 53 }, 54 }, []ast.Node{(*ast.CallExpr)(nil)} 55 }