mirror of
https://github.com/securego/gosec.git
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89 lines
2.6 KiB
Go
89 lines
2.6 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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gas "github.com/GoASTScanner/gas/core"
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"go/ast"
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"go/token"
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"regexp"
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)
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type Credentials struct {
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gas.MetaData
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pattern *regexp.Regexp
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}
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func (r *Credentials) Match(n ast.Node, ctx *gas.Context) (*gas.Issue, error) {
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switch node := n.(type) {
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case *ast.AssignStmt:
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return r.matchAssign(node, ctx)
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case *ast.GenDecl:
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return r.matchGenDecl(node, ctx)
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}
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return nil, nil
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}
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func (r *Credentials) matchAssign(assign *ast.AssignStmt, ctx *gas.Context) (*gas.Issue, error) {
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for _, i := range assign.Lhs {
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if ident, ok := i.(*ast.Ident); ok {
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if r.pattern.MatchString(ident.Name) {
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for _, e := range assign.Rhs {
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if rhs, ok := e.(*ast.BasicLit); ok && rhs.Kind == token.STRING {
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return gas.NewIssue(ctx, assign, r.What, r.Severity, r.Confidence), nil
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}
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}
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}
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}
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}
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return nil, nil
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}
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func (r *Credentials) matchGenDecl(decl *ast.GenDecl, ctx *gas.Context) (*gas.Issue, error) {
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if decl.Tok != token.CONST && decl.Tok != token.VAR {
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return nil, nil
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}
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for _, spec := range decl.Specs {
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if valueSpec, ok := spec.(*ast.ValueSpec); ok {
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for index, ident := range valueSpec.Names {
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if r.pattern.MatchString(ident.Name) && valueSpec.Values != nil {
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// const foo, bar = "same value"
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if len(valueSpec.Values) <= index {
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index = len(valueSpec.Values) - 1
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}
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if rhs, ok := valueSpec.Values[index].(*ast.BasicLit); ok && rhs.Kind == token.STRING {
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return gas.NewIssue(ctx, valueSpec, r.What, r.Severity, r.Confidence), nil
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}
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}
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}
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}
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}
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return nil, nil
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}
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func NewHardcodedCredentials(conf map[string]interface{}) (gas.Rule, []ast.Node) {
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pattern := `(?i)passwd|pass|password|pwd|secret|token`
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if val, ok := conf["G101"]; ok {
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pattern = val.(string)
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}
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return &Credentials{
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pattern: regexp.MustCompile(pattern),
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MetaData: gas.MetaData{
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What: "Potential hardcoded credentials",
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Confidence: gas.Low,
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Severity: gas.High,
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},
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}, []ast.Node{(*ast.AssignStmt)(nil), (*ast.GenDecl)(nil)}
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}
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