96 lines
2.7 KiB
Go
96 lines
2.7 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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"fmt"
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"go/ast"
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"strconv"
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"github.com/securego/gosec"
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)
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type filePermissions struct {
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gosec.MetaData
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mode int64
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pkg string
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calls []string
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}
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func (r *filePermissions) ID() string {
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return r.MetaData.ID
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}
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func getConfiguredMode(conf map[string]interface{}, configKey string, defaultMode int64) int64 {
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var mode = defaultMode
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if value, ok := conf[configKey]; ok {
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switch value := value.(type) {
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case int64:
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mode = value
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case string:
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if m, e := strconv.ParseInt(value, 0, 64); e != nil {
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mode = defaultMode
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} else {
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mode = m
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}
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}
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}
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return mode
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}
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func (r *filePermissions) Match(n ast.Node, c *gosec.Context) (*gosec.Issue, error) {
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if callexpr, matched := gosec.MatchCallByPackage(n, c, r.pkg, r.calls...); matched {
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modeArg := callexpr.Args[len(callexpr.Args)-1]
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if mode, err := gosec.GetInt(modeArg); err == nil && mode > r.mode {
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return gosec.NewIssue(c, n, r.ID(), r.What, r.Severity, r.Confidence), nil
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}
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}
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return nil, nil
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}
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// NewFilePerms creates a rule to detect file creation with a more permissive than configured
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// permission mask.
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func NewFilePerms(id string, conf gosec.Config) (gosec.Rule, []ast.Node) {
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mode := getConfiguredMode(conf, "G302", 0600)
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return &filePermissions{
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mode: mode,
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pkg: "os",
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calls: []string{"OpenFile", "Chmod"},
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MetaData: gosec.MetaData{
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ID: id,
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Severity: gosec.Medium,
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Confidence: gosec.High,
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What: fmt.Sprintf("Expect file permissions to be %#o or less", mode),
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},
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}, []ast.Node{(*ast.CallExpr)(nil)}
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}
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// NewMkdirPerms creates a rule to detect directory creation with more permissive than
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// configured permission mask.
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func NewMkdirPerms(id string, conf gosec.Config) (gosec.Rule, []ast.Node) {
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mode := getConfiguredMode(conf, "G301", 0750)
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return &filePermissions{
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mode: mode,
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pkg: "os",
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calls: []string{"Mkdir", "MkdirAll"},
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MetaData: gosec.MetaData{
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ID: id,
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Severity: gosec.Medium,
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Confidence: gosec.High,
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What: fmt.Sprintf("Expect directory permissions to be %#o or less", mode),
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},
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}, []ast.Node{(*ast.CallExpr)(nil)}
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}
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