Pascal (Lazarus/Delphi)

SSH Public Key Authentication

See more SSH Examples

Demonstrates how to authenticate with an SSH server using public key authentication. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Ssh,
  Chilkat.SshKey;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  ssh: TSsh;
  hostname: string;
  port: Integer;
  key: TSshKey;
  privKey: string;

begin
  success := False;

  //  This example assumes the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  ssh := TSsh.Create;

  //  Set some timeouts, in milliseconds:
  ssh.ConnectTimeoutMs := 5000;
  ssh.IdleTimeoutMs := 15000;

  //  Connect to the SSH server.  
  //  The standard SSH port = 22
  //  The hostname may be a hostname or IP address.
  hostname := 'sftp.example.com';
  port := 22;
  success := ssh.Connect(hostname,port);
  if (success <> True) then
    begin
      WriteLn(ssh.LastErrorText);
      Exit;
    end;

  key := TSshKey.Create;

  //  Read the PEM file into a string variable:
  //  (This does not load the PEM file into the key.  The LoadText
  //  method is a convenience method for loading the full contents of ANY text
  //  file into a string variable.)
  privKey := key.LoadText('myPrivateKey.pem');
  if (key.LastMethodSuccess <> True) then
    begin
      WriteLn(key.LastErrorText);
      Exit;
    end;

  //  Load a private key from a PEM string:
  //  (Private keys may be loaded from OpenSSH and Putty formats.
  //  Both encrypted and unencrypted private key file formats
  //  are supported.  This example loads an unencrypted private
  //  key in OpenSSH format.  PuTTY keys typically use the .ppk
  //  file extension, while OpenSSH keys use the PEM format.
  //  (For PuTTY keys, call FromPuttyPrivateKey instead.)
  success := key.FromOpenSshPrivateKey(privKey);
  if (success <> True) then
    begin
      WriteLn(key.LastErrorText);
      Exit;
    end;

  //  Authenticate with the SSH server using the login and
  //  private key.  (The corresponding public key should've 
  //  been installed on the SSH server beforehand.)
  success := ssh.AuthenticatePk('myLogin',key);
  if (success <> True) then
    begin
      WriteLn(ssh.LastErrorText);
      Exit;
    end;
  WriteLn(ssh.LastErrorText);
  WriteLn('Public-Key Authentication Successful!');


  ssh.Free;
  key.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.