Ruby

Set the FTP TLS Version and Ciphers

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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Ruby

require 'chilkat'

success = false

ftp = Chilkat::CkFtp2.new()

ftp.put_Hostname("ftp.example.com")
ftp.put_Username("myFtpLogin")

ftp.put_AuthTls(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.put_Password("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.put_SslProtocol("TLS 1.2 or higher")

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

success = ftp.Connect()
if (success == false)
    print ftp.lastErrorText() + "\n";
    exit
end

#  After connecting, read back what was actually negotiated.
print "Negotiated TLS version: " + ftp.tlsVersion() + "\n";
print "Negotiated cipher suite: " + ftp.tlsCipherSuite() + "\n";

success = ftp.Disconnect()
if (success == false)
    print ftp.lastErrorText() + "\n";
    exit
end