c# - Providing input to prompts that automatically display upon login to a device in SSH.NET

Question

I have a device I'm trying to connect to via SSH, in order to automate its configuration. Normally when you first connect to the device, it asks you to set up a local administration account. We don't want to configure this account automatically, because it defeats the purpose of automating this configuration.

Using ssh.net, I've tried to connect to the device, but authentication is refused.

using (SshClient client = new SshClient("10.10.10.41", 22, username, password))
{
    client.Connect();
    SshCommand command = client.CreateCommand(newUsername)
    command.execute

    command = client.CreateCommand(newPassword)
    command.execute
}

Is there a way to use SSH commands to set up the admin account? It should be as simply as sending a username and password, but if you it won't authenticate, I can't send any commands.

Thanks!

question from:https://stackoverflow.com/questions/65839487/providing-input-to-prompts-that-automatically-display-upon-login-to-a-device-in

Answer 1

You can wait for the prompt to type username and password by using ShellStream and Expect method.

using (SshClient client = new SshClient("10.10.10.41", 22, username, password))
{
    client.Connect();
    ShellStream shellStream = client.CreateShellStream(string.Empty, 0, 0, 0, 0, 0);
    shellStream.Expect("Please create a local administrator account."); // probably can be omitted
    shellStream.Expect("Username:"); // Expect has more parameters 
    shellStream.WriteLine(newUsername);
    shellStream.Expect("Password:"); // prompt to type password
    shellStream.WriteLine(newPassword);
    client.Disconnect();
}