Rust

Connect to an SSH Server Through Another (Jump Host)

Demonstrates the Chilkat Ssh.ConnectThroughSsh method, which connects to a second SSH server through an already connected and authenticated Ssh object. The first argument is the first (jump-host) Ssh object, and the second and third are the destination hostname and port.

Background: This is SSH chaining through a "jump host" (bastion): the application connects to a reachable gateway, then tunnels onward to a target that is only accessible from inside the network. Each hop is authenticated separately with its own credentials. The result is a normal Ssh object for the target that happens to be routed through the first connection.

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// Demonstrates the Ssh.ConnectThroughSsh method, which connects to a second SSH server through
// an already connected and authenticated Ssh object (a jump host).  The 1st argument is the
// first Ssh object, and the 2nd and 3rd are the destination hostname and port.

let ssh_jump = chilkat::Ssh::new();

// Connect and authenticate to the first SSH server (the jump host).
let ssh_port = 22;
if ssh_jump.connect("jump.example.com", ssh_port).is_err() {
    println!("{}", ssh_jump.last_error_text());
    return;
}

// Normally you would not hard-code the password in source.  You should instead obtain it
// from an interactive prompt, environment variable, or a secrets vault.
let password = "mySshPassword".to_string();

if ssh_jump.authenticate_pw("jumpUser", &password).is_err() {
    println!("{}", ssh_jump.last_error_text());
    return;
}

// Connect to the target SSH server through the jump host.
let ssh_target = chilkat::Ssh::new();
if ssh_target.connect_through_ssh(&ssh_jump, "target.example.com", ssh_port).is_err() {
    println!("{}", ssh_target.last_error_text());
    return;
}

// Authenticate to the target server (separate credentials).
if ssh_target.authenticate_pw("targetUser", &password).is_err() {
    println!("{}", ssh_target.last_error_text());
    return;
}

println!("Connected to the target through the jump host.");

ssh_target.disconnect();
ssh_jump.disconnect();