Auth fail error when using SharpSSH

Question

I am trying to connect to a Solaris/Unix server using a C# class to read system information/configuration, memory usage etc.

My requirement is to run the commands on the server from a C# application (as we do with a PuTTY client) and store the response in a string variable for later processing.

After some research, I found out that SharpSSH library can be used to do the same.

When I try to run my code, the following line gives me an Auth Fail exception. I am confident that the credentials (server name, user name and password) are correct since I am able to log-in from the PuTTY client with the same credentials.

SshStream ssh = new SshStream(servername, username, password);

What am I doing wrong?

The following is the stack trace if it helps!

at Tamir.SharpSsh.jsch.Session.connect(Int32 connectTimeout)  
at Tamir.SharpSsh.jsch.Session.connect()  
at Tamir.SharpSsh.SshStream..ctor(String host, String username, String password)

@JoachimIsaksson Sadly, I am not used to UNIX servers, nor am I an admin. I am asked to write a program to gather these information. — BlackCursor, Mar 27 '13 at 20:28
Is there anything more which need to be provided so that you can have an `SSH` connection with the server (I heard something about public/private keys. I assume that is for SCP)? — BlackCursor, Mar 27 '13 at 20:38
SharpSSH is not up-to-date and up-to-modern-servers, so issues are possible. There exist many more viable alternatives, both free and commercial. — Eugene Mayevski 'Callback, Mar 27 '13 at 20:56
@EugeneMayevski'EldoSCorp Can you by any chance suggest the alternatives? — BlackCursor, Mar 27 '13 at 21:00
SSH.NET library on Codeplex for free, our SecureBlackbox for commercial supported solution. — Eugene Mayevski 'Callback, Mar 27 '13 at 21:06

score 2 · Accepted Answer · answered Apr 16 '13 at 20:00

After some research, I found a VB code which pointed me to the right direction. It seems that adding an additional event handler for the KeyboardInteractiveAuthenticationMethod helped to solve this. Hope this helps someone else.

void HandleKeyEvent(Object sender, AuthenticationPromptEventArgs e)
    {
        foreach (AuthenticationPrompt prompt in e.Prompts)
        {
            if (prompt.Request.IndexOf("Password:", StringComparison.InvariantCultureIgnoreCase) != -1)
            {
                prompt.Response = password;
            }
        }
    }

private bool connectToServer()
{
    try
    {
        KeyboardInteractiveAuthenticationMethod kauth = new KeyboardInteractiveAuthenticationMethod(username);
        PasswordAuthenticationMethod pauth = new PasswordAuthenticationMethod(username, password);
        kauth.AuthenticationPrompt += new EventHandler<AuthenticationPromptEventArgs>(HandleKeyEvent);

        ConnectionInfo connectionInfo = new ConnectionInfo(serverName, port, username, pauth, kauth);

        sshClient = new SshClient(connectionInfo);
        sshClient.Connect();
        return true;
        }
    catch (Exception ex)
    {
        if (null != sshClient && sshClient.IsConnected)
        {
            sshClient.Disconnect();
        }
        throw ex;
    }
}

Can you give a little more information? What file or class did you add this code into? Thanks! — laughsloudly, Dec 30 '14 at 19:06
@laughsloudly I have used **SSH.NET library** from this [link](https://sshnet.codeplex.com/). I have created my own class and used `SshClient` object as a member variable. — BlackCursor, Jan 15 '15 at 21:13

Auth fail error when using SharpSSH

1 Answers1