Swift

Set the FTP Password from a SecureString

Demonstrates the Chilkat Ftp2.SetSecurePassword method, which sets the login password from a SecureString. The only argument is the SecureString. It is equivalent to setting the Password property but avoids holding the password as an ordinary immutable string.

Background: An ordinary string password can linger in memory (and in memory dumps) because strings are immutable and copied freely. A SecureString keeps the value encrypted under a session key and clears it deterministically, reducing that exposure — a sensible upgrade for a credential the process holds for the life of the connection. Populate it from a runtime source rather than a hard-coded literal.

Chilkat Swift Downloads

Download Chilkat for Swift

Swift


func chilkatTest() {
    var success: Bool = false

    //  Demonstrates the Ftp2.SetSecurePassword method, which sets the login password from a
    //  SecureString.  The only argument is the SecureString.  This avoids holding the password as an
    //  ordinary immutable string.

    let ftp = CkoFtp2()!

    ftp.hostname = "ftp.example.com"
    ftp.username = "myFtpLogin"

    //  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? = "myPassword"

    //  Place the password into a SecureString, which keeps it encrypted in memory.
    let securePassword = CkoSecureString()!
    securePassword.append(str: password)

    //  Setting the secure password is equivalent to setting the Password property, but more
    //  protective.
    success = ftp.setSecurePassword(password: securePassword)
    if success == false {
        print("\(ftp.lastErrorText!)")
        return
    }

    success = ftp.connect()
    if success == false {
        print("\(ftp.lastErrorText!)")
        return
    }

    print("Connected using a secure password.")

    success = ftp.disconnect()
    if success == false {
        print("\(ftp.lastErrorText!)")
        return
    }


}