Delphi DLL

SFTP Authenticate with Password and Private Key

Demonstrates the Chilkat SFtp.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. 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, combining something you know (the password) with something you have (the key). This method satisfies that policy in one call. As always, the password should come from a secure source rather than a literal in code.

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var
success: Boolean;
sftp: HCkSFtp;
port: Integer;
password: PWideChar;
privKey: HCkSshKey;
keyText: PWideChar;

begin
success := False;

//  Demonstrates the SFtp.AuthenticatePwPk method, which authenticates with a 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.

sftp := CkSFtp_Create();

//  Step 1: Connect the SSH transport.  Port 22 is the usual port.
port := 22;
success := CkSFtp_Connect(sftp,'sftp.example.com',port);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    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 := CkSFtp_AuthenticatePwPk(sftp,'mySshLogin',password,privKey);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;

//  Step 3: Open the SFTP subsystem.  This must be done after authentication and before any
//  file or directory operations.
success := CkSFtp_InitializeSftp(sftp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;

Memo1.Lines.Add('Authenticated with a password and a private key.');

CkSFtp_Disconnect(sftp);

CkSFtp_Dispose(sftp);
CkSshKey_Dispose(privKey);