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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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llSuccess = .F.

//  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.

loSftp = createobject("CkSFtp")

//  Step 1: Connect the SSH transport.  Port 22 is the usual port.
lnPort = 22
llSuccess = loSftp.Connect("sftp.example.com",lnPort)
if (llSuccess = .F.) then
    ? loSftp.LastErrorText
    release loSftp
    return
endif

//  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.
lcPassword = "mySshPassword"

//  Load the SSH private key.  LoadText reads the file's text, which is then imported.
loPrivKey = createobject("CkSshKey")
lcKeyText = loPrivKey.LoadText("qa_data/id_rsa")
if (loPrivKey.LastMethodSuccess = .F.) then
    ? loPrivKey.LastErrorText
    release loSftp
    release loPrivKey
    return
endif

llSuccess = loPrivKey.FromOpenSshPrivateKey(lcKeyText)
if (llSuccess = .F.) then
    ? loPrivKey.LastErrorText
    release loSftp
    release loPrivKey
    return
endif

llSuccess = loSftp.AuthenticatePwPk("mySshLogin",lcPassword,loPrivKey)
if (llSuccess = .F.) then
    ? loSftp.LastErrorText
    release loSftp
    release loPrivKey
    return
endif

//  Step 3: Open the SFTP subsystem.  This must be done after authentication and before any
//  file or directory operations.
llSuccess = loSftp.InitializeSftp()
if (llSuccess = .F.) then
    ? loSftp.LastErrorText
    release loSftp
    release loPrivKey
    return
endif

? "Authenticated with a password and a private key."

loSftp.Disconnect()


release loSftp
release loPrivKey