Swift

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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Swift


func chilkatTest() {
    var success: Bool = 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.

    let sftp = CkoSFtp()!

    //  Step 1: Connect the SSH transport.  Port 22 is the usual port.
    var port: Int = 22
    success = sftp.connect(hostname: "sftp.example.com", port: port)
    if success == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    //  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.
    var password: String? = "mySshPassword"

    //  Load the SSH private key.  LoadText reads the file's text, which is then imported.
    let privKey = CkoSshKey()!
    var keyText: String? = privKey.loadText(path: "qa_data/id_rsa")
    if privKey.lastMethodSuccess == false {
        print("\(privKey.lastErrorText!)")
        return
    }

    success = privKey.fromOpenSshPrivateKey(keyStr: keyText)
    if success == false {
        print("\(privKey.lastErrorText!)")
        return
    }

    success = sftp.authenticatePwPk(username: "mySshLogin", password: password, privateKey: privKey)
    if success == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    //  Step 3: Open the SFTP subsystem.  This must be done after authentication and before any
    //  file or directory operations.
    success = sftp.initializeSftp()
    if success == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    print("Authenticated with a password and a private key.")

    sftp.disconnect()

}