CkPython

Upgrade an FTP Control Channel to TLS (ConvertToTls)

Demonstrates the Chilkat Ftp2.ConvertToTls method, which upgrades an already-connected clear FTP control channel to explicit TLS. It takes no arguments and is used with a manually staged connection created by ConnectOnly while Ssl is disabled.

Background: This exposes the explicit-FTPS AUTH TLS upgrade as a discrete step for the rare case where you need to do something on the clear connection first — inspect the greeting, apply a workaround — before securing it. In the normal case you simply set AuthTls and let Connect perform the upgrade automatically; this manual path exists for staged control.

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import sys
import chilkat

success = False

#  Demonstrates the Ftp2.ConvertToTls method, which upgrades an already-connected clear FTP control
#  channel to explicit TLS.  It takes no arguments.  It is used with a manually staged connection
#  created by ConnectOnly while Ssl is disabled.

ftp = chilkat.CkFtp2()

ftp.put_Hostname("ftp.example.com")
ftp.put_Port(21)

#  Connect in clear text first (Ssl is false).
success = ftp.ConnectOnly()
if (success == False):
    print(ftp.lastErrorText())
    sys.exit()

#  Upgrade the control channel to explicit TLS (AUTH TLS).
success = ftp.ConvertToTls()
if (success == False):
    print(ftp.lastErrorText())
    sys.exit()

#  Now authenticate over the encrypted control channel.
ftp.put_Username("myFtpLogin")
ftp.put_Password("myPassword")
success = ftp.LoginAfterConnectOnly()
if (success == False):
    print(ftp.lastErrorText())
    sys.exit()

print("Control channel upgraded to TLS and logged in.")

success = ftp.Disconnect()
if (success == False):
    print(ftp.lastErrorText())
    sys.exit()