mirror of
https://github.com/securego/gosec.git
synced 2024-12-25 12:05:52 +00:00
111 lines
3.2 KiB
Go
111 lines
3.2 KiB
Go
// (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 (
|
|
"fmt"
|
|
"go/ast"
|
|
"strconv"
|
|
|
|
"github.com/securego/gosec"
|
|
)
|
|
|
|
type filePermissions struct {
|
|
gosec.MetaData
|
|
mode int64
|
|
pkg string
|
|
calls []string
|
|
}
|
|
|
|
func (r *filePermissions) ID() string {
|
|
return r.MetaData.ID
|
|
}
|
|
|
|
func getConfiguredMode(conf map[string]interface{}, configKey string, defaultMode int64) int64 {
|
|
var mode = defaultMode
|
|
if value, ok := conf[configKey]; ok {
|
|
switch value := value.(type) {
|
|
case int64:
|
|
mode = value
|
|
case string:
|
|
if m, e := strconv.ParseInt(value, 0, 64); e != nil {
|
|
mode = defaultMode
|
|
} else {
|
|
mode = m
|
|
}
|
|
}
|
|
}
|
|
return mode
|
|
}
|
|
|
|
func (r *filePermissions) Match(n ast.Node, c *gosec.Context) (*gosec.Issue, error) {
|
|
if callexpr, matched := gosec.MatchCallByPackage(n, c, r.pkg, r.calls...); matched {
|
|
modeArg := callexpr.Args[len(callexpr.Args)-1]
|
|
if mode, err := gosec.GetInt(modeArg); err == nil && mode > r.mode {
|
|
return gosec.NewIssue(c, n, r.ID(), r.What, r.Severity, r.Confidence), nil
|
|
}
|
|
}
|
|
return nil, nil
|
|
}
|
|
|
|
// NewWritePerms creates a rule to detect file Writes with bad permissions.
|
|
func NewWritePerms(id string, conf gosec.Config) (gosec.Rule, []ast.Node) {
|
|
mode := getConfiguredMode(conf, "G306", 0600)
|
|
return &filePermissions{
|
|
mode: mode,
|
|
pkg: "io/ioutil",
|
|
calls: []string{"WriteFile"},
|
|
MetaData: gosec.MetaData{
|
|
ID: id,
|
|
Severity: gosec.Medium,
|
|
Confidence: gosec.High,
|
|
What: fmt.Sprintf("Expect WriteFile permissions to be %#o or less", mode),
|
|
},
|
|
}, []ast.Node{(*ast.CallExpr)(nil)}
|
|
}
|
|
|
|
// NewFilePerms creates a rule to detect file creation with a more permissive than configured
|
|
// permission mask.
|
|
func NewFilePerms(id string, conf gosec.Config) (gosec.Rule, []ast.Node) {
|
|
mode := getConfiguredMode(conf, "G302", 0600)
|
|
return &filePermissions{
|
|
mode: mode,
|
|
pkg: "os",
|
|
calls: []string{"OpenFile", "Chmod"},
|
|
MetaData: gosec.MetaData{
|
|
ID: id,
|
|
Severity: gosec.Medium,
|
|
Confidence: gosec.High,
|
|
What: fmt.Sprintf("Expect file permissions to be %#o or less", mode),
|
|
},
|
|
}, []ast.Node{(*ast.CallExpr)(nil)}
|
|
}
|
|
|
|
// NewMkdirPerms creates a rule to detect directory creation with more permissive than
|
|
// configured permission mask.
|
|
func NewMkdirPerms(id string, conf gosec.Config) (gosec.Rule, []ast.Node) {
|
|
mode := getConfiguredMode(conf, "G301", 0750)
|
|
return &filePermissions{
|
|
mode: mode,
|
|
pkg: "os",
|
|
calls: []string{"Mkdir", "MkdirAll"},
|
|
MetaData: gosec.MetaData{
|
|
ID: id,
|
|
Severity: gosec.Medium,
|
|
Confidence: gosec.High,
|
|
What: fmt.Sprintf("Expect directory permissions to be %#o or less", mode),
|
|
},
|
|
}, []ast.Node{(*ast.CallExpr)(nil)}
|
|
}
|