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Newsgroups: mail-lists.delegate-en

[DeleGate-En] Re: delegate as FTPS-proxy blocks
17 Apr 2001 19:43:41 GMT (Yutaka Sato)

On 04/17/01(16:50) I wrote in <_A1100@delegate-en.ML_>
 | |Is this setup even possible ?
 |If the client can be configured to use SSL without negotiation,
 |at least the control-connection will be relayed with the FTP-DeleGate
 |with FCL=sslway.  And the enclosed patch will make FTP-DeleGate apply
 |the FCL=sslway to each data-connection too.  I checked two chained
 |FTP-DeleGates with FSV=sslway and FCL=sslway respectively do
 |SSL data-connection by the patch.  But I don't know if there is a
 |client or a server which goes this way.
 |Maybe I will read following documents and support them, in near future.
 |  RFC2228 (Oct.1997)
 |  draft-murray-auth-ftp-ssl-07.txt (Apr.2001)

I found the answer in the internet-draft:

>A.  Deprecated SSL negotiation mechanisms
>  There are two other mechanisms that have been used for FTP over SSL,
>  these mechanisms do not conform to [RFC-2228] and so are now
>  deprecated.  They are documented below.
>  i) Implicit SSL protection of the FTP session
>     There is a port, registered with the IANA, for secure FTP using
>     ssl {FTP-TLSPORT}.  This approach can be likened to the [RFC-2818]
>     approach for https, in that the SSL negotiation happens upon
>     connection  (for the control and all data connections).  This
>     approach is not favoured by the IETF and should not be used for
>     new FTP-TLS implementations.

Although deprecated now, this implicit approach using a dedicated
FTP-TLSPORT, ie. "FTPS" port (990), is the very one which is implemented
in DeleGate with the patch in my previous message.

  @ @ Yutaka Sato <>
 ( - ) National Institute of Advanced Industrial Science and Technology (AIST)
_<   >_ 1-1-4 Umezono, Tsukuba, Ibaraki, 305-8568 Japan

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