SSH Public Key Authentication

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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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    success := false

    //  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.

    ssh := chilkat.NewSsh()

    //  Timeouts, in milliseconds.
    ssh.SetConnectTimeoutMs(5000)
    ssh.SetReadTimeoutMs(15000)

    hostname := "ssh.example.com"
    port := 22
    success = ssh.Connect(hostname,port)
    if success == false {
        fmt.Println(ssh.LastErrorText())
        ssh.DisposeSsh()
        return
    }

    //  LoadText is a convenience method that reads any text file into a string.  It does not itself
    //  load the key.
    key := chilkat.NewSshKey()
    privKeyText := key.LoadText("qa_data/my_private_key.pem")
    if key.LastMethodSuccess() == false {
        fmt.Println(key.LastErrorText())
        ssh.DisposeSsh()
        key.DisposeSshKey()
        return
    }

    //  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.
    success = key.FromOpenSshPrivateKey(*privKeyText)
    if success == false {
        fmt.Println(key.LastErrorText())
        ssh.DisposeSsh()
        key.DisposeSshKey()
        return
    }

    success = ssh.AuthenticatePk("mySshLogin",key)
    if success == false {
        fmt.Println(ssh.LastErrorText())
        ssh.DisposeSsh()
        key.DisposeSshKey()
        return
    }

    fmt.Println("Public-key authentication successful.")

    ssh.Disconnect()

    ssh.DisposeSsh()
    key.DisposeSshKey()