mirror of
https://github.com/securego/gosec.git
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63 lines
1.8 KiB
Go
63 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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"github.com/GoASTScanner/gas"
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)
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type readfile struct {
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gas.MetaData
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gas.CallList
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}
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// ID returns the identifier for this rule
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func (r *readfile) ID() string {
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return r.MetaData.ID
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}
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// Match inspects AST nodes to determine if the match the methods `os.Open` or `ioutil.ReadFile`
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func (r *readfile) Match(n ast.Node, c *gas.Context) (*gas.Issue, error) {
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if node := r.ContainsCallExpr(n, c); node != nil {
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for _, arg := range node.Args {
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if ident, ok := arg.(*ast.Ident); ok {
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obj := c.Info.ObjectOf(ident)
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if _, ok := obj.(*types.Var); ok && !gas.TryResolve(ident, c) {
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return gas.NewIssue(c, n, r.ID(), 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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return nil, nil
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}
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// NewReadFile detects cases where we read files
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func NewReadFile(id string, conf gas.Config) (gas.Rule, []ast.Node) {
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rule := &readfile{
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CallList: gas.NewCallList(),
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MetaData: gas.MetaData{
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ID: id,
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What: "Potential file inclusion via variable",
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Severity: gas.Medium,
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Confidence: gas.High,
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},
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}
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rule.Add("io/ioutil", "ReadFile")
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rule.Add("os", "Open")
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return rule, []ast.Node{(*ast.CallExpr)(nil)}
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}
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