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// (c) Copyright 2016 Hewlett Packard Enterprise Development LP
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package rules
import (
"go/ast"
"github.com/securego/gosec"
)
type weakRand struct {
gosec.MetaData
funcNames []string
packagePath string
}
func (w *weakRand) ID() string {
return w.MetaData.ID
}
func (w *weakRand) Match(n ast.Node, c *gosec.Context) (*gosec.Issue, error) {
for _, funcName := range w.funcNames {
if _, matched := gosec.MatchCallByPackage(n, c, w.packagePath, funcName); matched {
return gosec.NewIssue(c, n, w.ID(), w.What, w.Severity, w.Confidence), nil
}
}
return nil, nil
}
// NewWeakRandCheck detects the use of random number generator that isn't cryptographically secure
func NewWeakRandCheck(id string, conf gosec.Config) (gosec.Rule, []ast.Node) {
return &weakRand{
funcNames: []string{"Read", "Int"},
packagePath: "math/rand",
MetaData: gosec.MetaData{
ID: id,
Severity: gosec.High,
Confidence: gosec.Medium,
What: "Use of weak random number generator (math/rand instead of crypto/rand)",
},
}, []ast.Node{(*ast.CallExpr)(nil)}
}
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