Re: SFTP Information, technical, white paper etc.

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From: Gus M. Creces (gcreces_at_sympatico.ca)
Date: 02/16/04 

Date: Mon, 16 Feb 2004 15:05:18 -0500

Peter...
I've got FTP over SSL under control.
It's the SSH2 thingy I'm after.
Haven't followed up on your links yet but they look like a good start from a
cursory look-over.
Much obliged for the very detailed response and for clearing up the
definition of "SFTP".

Cheers... 

-- 
Gus M. Creces
The Clarion Handy Tools Page
http://www.cwhandy.ca
http://news.cwhandy.ca
support@cwhandy.com
"J. Peter Mugaas" <oma00215@mail.wvnet.edu> wrote in message
news:1olimp22lae3g.newo0ckc0o6n.dlg@40tude.net...
> On Mon, 16 Feb 2004 13:18:19 -0500, Gus M. Creces wrote:
>
> > Hi...
> > I'm looking for some information, technical, white paper - whatever - on
how
> > SFTP works.
>
> I wonder what you mean by SFTP.  Most often, it is referring to a file
> transfer protocol included with SSH2.  If you are referring to that, you
> may want to look at http://www.ietf.org/html.charters/secsh-charter.html
as
> that IETF group has some working drafts describing SSH and the SSH File
> Transfer Protocol plus there may be information about it at
> http://www.openssh.org/.  Another thing that is sometimes called SFTP is
> FTP over a SSL connection.  There is no formal document describing that
> although it was in an old IETF Internet Draft.  That's what I call FTP
with
> implicit SSL.  In this, you use the standard FTP protocol over SSL
> encryption using a special port (990) and special data channel negotiation
> commands are used (PBSZ 0 along with either PROT P for an encrypted data
> port or PROT C for an unencrypted data port).  This is being depreciated
in
> favor of FTP with explicit SSL which is described in
> (http://www.ietf.org/internet-drafts/draft-murray-auth-ftp-ssl-12.txt).
>
> There also is a protocol called SFTP (Simple File Transfer Protocol) which
> is described in RFC 913 (you can get the RFC's in many places).  I doubt
> that you will see much demand for RFC 913 support.
>
> Indy (http://www.indyproject.org) currently does support FTP with TLS
(both
> implicit and explicit SSL) using third-party SSL frameworks (the vendor
> would make descendant classes for it to work transparantly).  I had looked
> at adding OpenSSL support to the DotNET version of Indy but I found I
> couldn't do this as I got in way over my head.  The problem is that I
would
> have to use the P/Invoke interface as well as some type marshaling (.DLL's
> are very particular about such things in DotNET, it can be tricky).
Making
> this worse is that in OpenSSL, you have .DLL callback routines and you
have
> to set a procedure to an address of a SSL method located in the .DLL.  If
> someone can do this in DotNET, we may be able to support FTP with SSL plus
> support a number of other SSL protocols.
> -- 
> J. Peter Mugaas - Indy Pit Crew
> Internet Direct (Indy) Website - http://www.nevrona.com/Indy
> Personal Home Page - http://www.wvnet.edu/~oma00215
> If I want to do business with you, I will contact you.  Otherwise, do not
> contact me.

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