CODEWITHSUNDEEP
rust
fengsp
fengsp

Reputation: 1165

How can I get password input without showing user input?

How can I get password input without showing user input?

fn main() {
    println!("Type Your Password");

    // I want to hide input here, and do not know how
    let input = std::old_io::stdin().read_line().ok().expect("Failed to read line");

    println!("{}", input);
}

Upvotes: 20

Views: 11912

Answers (2)

ReliableAirRepair
ReliableAirRepair

Reputation: 29

i'm new to rust so this actually took me a while to figure out but in the end i used TermRead to hide the password:

use termion::input::TermRead;
use std::io;

fn strip_nl(s: &mut String) -> String {
    if s.ends_with('\n') {
        s.pop();
        if s.ends_with('\r') {
            s.pop();
        }
    }
    let out: String = s.to_string();
    out
}

fn prompt() -> (String, String) {
    let mut username = String::new();
    let stdin = io::stdin();
    let mut stdin = stdin;
    let stdout = io::stdout();
    let mut stdout = stdout;

    println!("Enter Username:");
    io::stdin().read_line(&mut username).expect("Failed to read username.");

    println!("Enter Password:");
    let passwd = TermRead::read_passwd(&mut stdin, &mut stdout);

    let Ok(Some(mut password)) = passwd else { todo!() };
    (strip_nl(&mut username), strip_nl(&mut password))
}

fn main() {
    let (username, password) = prompt();

    println!("");

    println!("{}, {}", username, password)
}

Upvotes: 1

Caspar
Caspar

Reputation: 7759

Update: you can use the rpassword crate. Quoting from the README:

Add the rpassword crate to your Cargo.toml:

[dependencies]
rpassword = "0.0.4"

Then use the read_password() function:

extern crate rpassword;
    
use rpassword::read_password;
use std::io::Write;
    
fn main() {
    print!("Type a password: ");
    std::io::stdout().flush().unwrap();
    let password = read_password().unwrap();
    println!("The password is: '{}'", password);
}

Old answer

I suspect your best bet is calling some C functions from rust: either getpass (3) or its recommended alternatives (see Getting a password in C without using getpass). The tricky thing is that it differs by platform, of course (if you get it working, it'd be handy as a crate).

Depending on your requirements, you could also try using ncurses-rs (crate "ncurses"); I haven't tested it but it looks like example 2 might demo turning off echoing input.

Upvotes: 22

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