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rustpermissionsrootuser-permissions
hiro protagonist
hiro protagonist

Reputation: 46899

How can I ensure that a Rust executable is run with root permissions on Linux?

I would like to ensure my executable is run with root permissions under Linux. i came up with this:

use std::env;
use std::process::exit;

fn main() {
    match env::var("USER") {
        Err(e) => {
            println!("Something went wrong: {:?}", e);
            exit(2);
        }
        Ok(name) => {
            if name != "root" {
                println!("Must be root...");
                exit(1);
            }
        }
    }

    println!("ok!");
}

Is there a more concise / idiomatic way to do this? How could I have access to the effective user id (EUID)?

Upvotes: 1

Views: 3686

Answers (1)

hiro protagonist
hiro protagonist

Reputation: 46899

What I've found (and what is used in libcryptsetup-rs) is this:

use nix::unistd::Uid;

fn main() {
    if !Uid::effective().is_root() {
        panic!("You must run this executable with root permissions");
    }
}

Whether to panic!, println!, or exit is up to the programmer to decide.

Upvotes: 5

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