Visual FoxPro

SSH Public Key Authentication

Demonstrates authenticating with an SSH server using public-key authentication. A private key is loaded into an SshKey object and passed to AuthenticatePk. The matching public key must already be installed on the server for the account.

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 never leaves the client, the server merely trusts the corresponding public key, and no reusable password crosses the wire. SshKey imports several formats — OpenSSH PEM keys via FromOpenSshPrivateKey and PuTTY .ppk files via FromPuttyPrivateKey — encrypted or not. For an encrypted key, set the Password property before importing. Note that LoadText is only a convenience for reading a text file into a string; it does not itself load the key.

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LOCAL lnSuccess
LOCAL loSsh
LOCAL lcHostname
LOCAL lnPort
LOCAL loKey
LOCAL lcPrivKeyText

lnSuccess = 0

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

*  Demonstrates authenticating with an SSH server using public-key authentication.  The matching
*  public key must already be installed on the SSH server for the account.

loSsh = CreateObject('Chilkat.Ssh')

*  Timeouts, in milliseconds.
loSsh.ConnectTimeoutMs = 5000
loSsh.ReadTimeoutMs = 15000

lcHostname = "ssh.example.com"
lnPort = 22
lnSuccess = loSsh.Connect(lcHostname,lnPort)
IF (lnSuccess = 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

*  LoadText is a convenience method that reads any text file into a string.  It does not itself
*  load the key.
loKey = CreateObject('Chilkat.SshKey')
lcPrivKeyText = loKey.LoadText("qa_data/my_private_key.pem")
IF (loKey.LastMethodSuccess = 0) THEN
    ? loKey.LastErrorText
    RELEASE loSsh
    RELEASE loKey
    CANCEL
ENDIF

*  Import the private key.  Both OpenSSH and PuTTY formats are supported, encrypted or not.
*  This example loads an unencrypted OpenSSH-format key; for a PuTTY .ppk file, call
*  FromPuttyPrivateKey instead.  For an encrypted key, set key.Password before importing.
lnSuccess = loKey.FromOpenSshPrivateKey(lcPrivKeyText)
IF (lnSuccess = 0) THEN
    ? loKey.LastErrorText
    RELEASE loSsh
    RELEASE loKey
    CANCEL
ENDIF

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

? "Public-key authentication successful."

loSsh.Disconnect()

RELEASE loSsh
RELEASE loKey