Visual FoxPro

SSH Authenticate with a Private Key

Demonstrates the Chilkat Ssh.AuthenticatePk method, which authenticates a connected SSH session using public-key authentication. The first argument is the username and the second is an SshKey private key. The matching public key must already be authorized for the account on the server.

Note: The private-key path is relative to the application's current working directory. Supply the path to your own key file.

Background: Public-key authentication is the standard for unattended and automated SSH: the private key stays on the client, the server trusts the corresponding public key, and no reusable password crosses the wire. The SshKey object imports keys in several formats — this example loads an OpenSSH private key. An empty or public-only key is rejected locally.

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LOCAL lnSuccess
LOCAL loSsh
LOCAL lnSshPort
LOCAL loPrivKey
LOCAL lcKeyStr

lnSuccess = 0

*  Demonstrates the Ssh.AuthenticatePk method, which authenticates a connected SSH session using
*  public-key authentication.  The 1st argument is the username and the 2nd is an SshKey private
*  key.  The matching public key must already be authorized for the account on the server.

loSsh = CreateObject('Chilkat.Ssh')

*  Connect to the SSH server.  Port 22 is the usual SSH port.
lnSshPort = 22
lnSuccess = loSsh.Connect("ssh.example.com",lnSshPort)
IF (lnSuccess = 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

*  Load the SSH private key.  LoadText reads the file's text, which is then imported.
loPrivKey = CreateObject('Chilkat.SshKey')
lcKeyStr = loPrivKey.LoadText("qa_data/id_rsa")
IF (loPrivKey.LastMethodSuccess = 0) THEN
    ? loPrivKey.LastErrorText
    RELEASE loSsh
    RELEASE loPrivKey
    CANCEL
ENDIF

lnSuccess = loPrivKey.FromOpenSshPrivateKey(lcKeyStr)
IF (lnSuccess = 0) THEN
    ? loPrivKey.LastErrorText
    RELEASE loSsh
    RELEASE loPrivKey
    CANCEL
ENDIF

lnSuccess = loSsh.AuthenticatePk("mySshLogin",loPrivKey)
IF (lnSuccess = 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    RELEASE loPrivKey
    CANCEL
ENDIF

? "Authenticated with private key."

loSsh.Disconnect()

RELEASE loSsh
RELEASE loPrivKey