Set the FTP TLS Version and Ciphers

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Demonstrates the TLS negotiation properties SslProtocol and SslAllowedCiphers, and reads back the negotiated TlsVersion and TlsCipherSuite after connecting.

Background: SslProtocol sets the allowed (or minimum) TLS version — default lets Chilkat negotiate the best available, while a value like TLS 1.2 or higher enforces a floor for policy compliance. SslAllowedCiphers narrows the offered cipher suites, which most applications should leave at the secure defaults. The read-only TlsVersion and TlsCipherSuite report what was actually agreed, useful for logging and audits.

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    success := false

    ftp := chilkat.NewFtp2()

    ftp.SetHostname("ftp.example.com")
    ftp.SetUsername("myFtpLogin")

    ftp.SetAuthTls(true)

    //  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.
    ftp.SetPassword("myPassword")

    //  Require at least TLS 1.2.  Accepted values include "default", "TLS 1.3", "TLS 1.2",
    //  "TLS 1.2 or higher", and so on.  "default" lets Chilkat negotiate the best available.
    ftp.SetSslProtocol("TLS 1.2 or higher")

    //  Optionally restrict the cipher suites offered.  Leave empty to use Chilkat's secure defaults.
    ftp.SetSslAllowedCiphers("TLS_AES_256_GCM_SHA384,TLS_CHACHA20_POLY1305_SHA256")

    success = ftp.Connect()
    if success == false {
        fmt.Println(ftp.LastErrorText())
        ftp.DisposeFtp2()
        return
    }

    //  After connecting, read back what was actually negotiated.
    fmt.Println("Negotiated TLS version: ", ftp.TlsVersion())
    fmt.Println("Negotiated cipher suite: ", ftp.TlsCipherSuite())

    success = ftp.Disconnect()
    if success == false {
        fmt.Println(ftp.LastErrorText())
        ftp.DisposeFtp2()
        return
    }


    ftp.DisposeFtp2()