Delphi DLL

SSH Tunnel Authenticate with Password and Private Key

Demonstrates the Chilkat SshTunnel.AuthenticatePwPk method, which authenticates with a server that requires both a password and a private key. The arguments are the username, the password, and an SshKey private key.

Note: The private-key path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own key file.

Background: Most servers require either a password or a public key, not both — but some high-security deployments mandate two-factor SSH. This method satisfies that policy in one call, combining something you know (the password) with something you have (the key). The password should come from a secure source rather than a literal.

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var
success: Boolean;
tunnel: HCkSshTunnel;
sshPort: Integer;
password: PWideChar;
privKey: HCkSshKey;
keyText: PWideChar;
waitForThreadExit: Boolean;

begin
success := False;

//  Demonstrates the SshTunnel.AuthenticatePwPk method, which authenticates with an SSH server that
//  requires BOTH a password and a private key.  The 1st argument is the username, the 2nd is the
//  password, and the 3rd is an SshKey private key.

tunnel := CkSshTunnel_Create();

//  The tunnel forwards accepted local connections to this destination through the SSH server.
CkSshTunnel_putDestHostname(tunnel,'db.internal.example.com');
CkSshTunnel_putDestPort(tunnel,5432);

//  Connect to the SSH server.  This performs the TCP/proxy connection and SSH handshake, but
//  does not authenticate yet.
sshPort := 22;
success := CkSshTunnel_Connect(tunnel,'ssh.example.com',sshPort);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSshTunnel__lastErrorText(tunnel));
    Exit;
  end;

//  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.
password := 'mySshPassword';

//  Load the SSH private key.  LoadText reads the file's text, which is then imported.
privKey := CkSshKey_Create();
keyText := CkSshKey__loadText(privKey,'qa_data/id_rsa');
if (CkSshKey_getLastMethodSuccess(privKey) = False) then
  begin
    Memo1.Lines.Add(CkSshKey__lastErrorText(privKey));
    Exit;
  end;
success := CkSshKey_FromOpenSshPrivateKey(privKey,keyText);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSshKey__lastErrorText(privKey));
    Exit;
  end;

success := CkSshTunnel_AuthenticatePwPk(tunnel,'mySshLogin',password,privKey);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSshTunnel__lastErrorText(tunnel));
    Exit;
  end;
Memo1.Lines.Add('Authenticated with a password and a private key.');

//  After authenticating, call BeginAccepting to start listening for local connections to forward.

waitForThreadExit := True;
success := CkSshTunnel_CloseTunnel(tunnel,waitForThreadExit);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSshTunnel__lastErrorText(tunnel));
    Exit;
  end;

CkSshTunnel_Dispose(tunnel);
CkSshKey_Dispose(privKey);