(Ruby) FTP Connect, Examine Server Certificate, and then Authenticate

Demonstrates how to connect to an FTP server, examine the server's SSL/TLS certificate, and then, if it meets the application's security requirements, proceed to authenticate.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

success = false

# This example assumes Chilkat Ftp2 to have been previously unlocked.
# See Unlock Ftp2 for sample code.

ftp = Chilkat::CkFtp2.new()

ftp.put_Hostname("www.authtls-ftps-server.com")
ftp.put_Username("FTP_LOGIN")
ftp.put_Password("FTP_PASSWORD")
ftp.put_AuthTls(true)
ftp.put_Port(21)

# Connect to the FTP server using explicit TLS (AUTH TLS).
success = ftp.ConnectOnly()
if (success == false)
    print ftp.lastErrorText() + "\n";
    exit
end

# Get the FTP server's certificate.
serverCert = Chilkat::CkCert.new()
success = ftp.GetServerCert(serverCert)
if (success == false)
    print ftp.lastErrorText() + "\n";
    exit
end

# Now that we have the certificate, we can check it in any way we desire.
# (See the online reference documentation for the certificate object's methods
# and properties)...

# Assuming the certificate is OK, proceed to authenticate with the FTP server.
success = ftp.LoginAfterConnectOnly()
if (success == false)
    print ftp.lastErrorText() + "\n";
    exit
end

# 
# Proceed with uploading/download files, etc...
# 

ftp.Disconnect()
print "Success." + "\n";