mirror of
https://github.com/securego/gosec.git
synced 2024-11-05 19:45:51 +00:00
81 lines
1.8 KiB
Go
81 lines
1.8 KiB
Go
// (c) Copyright 2016 Hewlett Packard Enterprise Development LP
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package rules
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import (
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"go/ast"
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"go/types"
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"regexp"
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gas "github.com/GoASTScanner/gas/core"
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)
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type WeakRand struct {
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gas.MetaData
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pattern *regexp.Regexp
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packagePath string
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}
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func matchFuncCall(n ast.Node, c *gas.Context) (types.Object, *ast.Ident) {
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call, ok := n.(*ast.CallExpr)
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if !ok {
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return nil, nil
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}
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sel, ok := call.Fun.(*ast.SelectorExpr)
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if !ok {
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return nil, nil
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}
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id, ok := sel.X.(*ast.Ident)
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if !ok {
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return nil, nil
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}
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return c.Info.ObjectOf(id), sel.Sel
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}
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func (w *WeakRand) Match(n ast.Node, c *gas.Context) (*gas.Issue, error) {
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o, f := matchFuncCall(n, c)
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if o == nil || f == nil {
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return nil, nil
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}
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pkg, ok := o.(*types.PkgName)
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if !ok {
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return nil, nil
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}
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if pkg.Imported().Path() == w.packagePath && w.pattern.MatchString(f.String()) {
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return gas.NewIssue(c, n, w.What, w.Severity, w.Confidence), nil
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}
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return nil, nil
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}
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func NewWeakRandCheck(conf map[string]interface{}) (r gas.Rule, n ast.Node) {
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r = &WeakRand{
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pattern: regexp.MustCompile(`^Read$`),
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packagePath: "math/rand",
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MetaData: gas.MetaData{
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Severity: gas.High,
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Confidence: gas.Medium,
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What: "Use of weak random number generator (math/rand instead of crypto/rand)",
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},
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}
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n = (*ast.CallExpr)(nil)
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return
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}
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