File permissions

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Metadata

ID: go-security/chmod-permissions

Language: Go

Severity: Warning

Category: Security

Description

Granting write access to a file is a security since other users can modify the content of the file. The issue is amplified for executable files that can be easily compromised (like scripts). Avoid giving write permissions to others to files.

Learn More

CWE-284: Improper Access Control

Non-Compliant Code Examples

package main

import (
	"fmt"
	"os"
)

func main() {
	err := os.Chmod("/tmp/somefile", 0777)
	if err != nil {
		fmt.Println("Error when changing file permissions!")
		return
	}
}

package main

import (
	"fmt"
	"os"
)

func main() {
	_, err := os.OpenFile("/tmp/thing", os.O_CREATE|os.O_WRONLY, 0666)
	if err != nil {
		fmt.Println("Cannot create file")
		return
	}
}

Compliant Code Examples

package main

import (
	"fmt"
	"os"
)

func main() {
	err := os.Chmod("/tmp/somefile", 0770)
	if err != nil {
		fmt.Println("Error when changing file permissions!")
		return
	}
}

package main

import (
	"fmt"
	"os"
)

func main() {
	_, err := os.OpenFile("/tmp/thing", os.O_CREATE|os.O_WRONLY, 0660)
	if err != nil {
		fmt.Println("Cannot create file")
		return
	}
}