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yggdrasil-go/cmd/yggdrasil/chuser_unix_test.go
Klemens Nanni c22a746a1d
Rewrite chuser() for simplicity and correctness (#1203)
- Use unambiguous variable names (w/o package name conflict).
- Fail on invalid input such as the empty string or `:`.
- Do not change group without user, i.e. fail on `:group`.
- Parse input using mnemonic APIs.
- Do not juggle between integer types.
- Unset supplementary groups.
- Use set[ug]id(2) to follow the idiom of OpenBSD base programs.
  (cannot use setres[ug]id(2) as macOS does not have them.)

Includes/Supersedes #1202.
Fixes #927.

I only tested on OpenBSD (so far), but other systems should just work.
2024-11-17 21:37:07 +00:00

81 lines
1.6 KiB
Go

//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
package main
import (
"testing"
"os/user"
)
// Usernames must not contain a number sign.
func TestEmptyString (t *testing.T) {
if chuser("") == nil {
t.Fatal("the empty string is not a valid user")
}
}
// Either omit delimiter and group, or omit both.
func TestEmptyGroup (t *testing.T) {
if chuser("0:") == nil {
t.Fatal("the empty group is not allowed")
}
}
// Either user only or user and group.
func TestGroupOnly (t *testing.T) {
if chuser(":0") == nil {
t.Fatal("group only is not allowed")
}
}
// Usenames must not contain the number sign.
func TestInvalidUsername (t *testing.T) {
const username = "#user"
if chuser(username) == nil {
t.Fatalf("'%s' is not a valid username", username)
}
}
// User IDs must be non-negative.
func TestInvalidUserid (t *testing.T) {
if chuser("-1") == nil {
t.Fatal("User ID cannot be negative")
}
}
// Change to the current user by ID.
func TestCurrentUserid (t *testing.T) {
usr, err := user.Current()
if err != nil {
t.Fatal(err)
}
if usr.Uid != "0" {
t.Skip("setgroups(2): Only the superuser may set new groups.")
}
if err = chuser(usr.Uid); err != nil {
t.Fatal(err)
}
}
// Change to a common user by name.
func TestCommonUsername (t *testing.T) {
usr, err := user.Current()
if err != nil {
t.Fatal(err)
}
if usr.Uid != "0" {
t.Skip("setgroups(2): Only the superuser may set new groups.")
}
if err := chuser("nobody"); err != nil {
if _, ok := err.(user.UnknownUserError); ok {
t.Skip(err)
}
t.Fatal(err)
}
}