Connect to an SFTP Server Through a Jump Host

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

Background: This is the "jump host" (bastion) pattern: the application connects to a reachable gateway, then tunnels onward to an SFTP server that is only accessible from inside the network. Each hop authenticates separately with its own credentials. The result is a normal SFtp object — still requiring its own authentication and InitializeSftp — that happens to be routed through the first connection.

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bool success = false;

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

Chilkat.Ssh sshJump = new Chilkat.Ssh();

//  Connect and authenticate to the jump host first.
int port = 22;
success = sshJump.Connect("jump.example.com",port);
if (success == false) {
    Debug.WriteLine(sshJump.LastErrorText);
    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.
string password = "mySshPassword";

success = sshJump.AuthenticatePw("myJumpLogin",password);
if (success == false) {
    Debug.WriteLine(sshJump.LastErrorText);
    return;
}

//  Connect to the SFTP server through the jump host.
Chilkat.SFtp sftp = new Chilkat.SFtp();
success = sftp.ConnectThroughSsh(sshJump,"sftp.internal.example.com",port);
if (success == false) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

//  Authenticate to the SFTP server (its own credentials), then initialize SFTP.
success = sftp.AuthenticatePw("mySshLogin",password);
if (success == false) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

success = sftp.InitializeSftp();
if (success == false) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

Debug.WriteLine("Connected to the SFTP server through the jump host.");

sftp.Disconnect();
sshJump.Disconnect();