[Dovecot] [PATCH, RFC] add APOP authentication mechanism

[Andrey Panin]

On 185, 07 03, 2004 at 01:01:15AM +0300, Timo Sirainen wrote:
> On Fri, 2004-07-02 at 10:27, Andrey Panin wrote:
> > AUTHNTICATE APOP will not work in IMAP session anyway because it
> > doesn't pass initial responce required for APOP, so looks like
> > this check is not really necessary.
> 
> Currently it doesn't, but there most likely will be extension which adds
> initial response support for IMAP. I think there already was a draft.
> 
> > > POP3 RFC also says:
> > > 
> > >    It is conjectured that use of the APOP command provides origin
> > >    identification and replay protection for a POP3 session.
> > >    Accordingly, a POP3 server which implements both the PASS and APOP
> > >    commands should not allow both methods of access for a given user;
> > >    that is, for a given mailbox name, either the USER/PASS command
> > >    sequence or the APOP command is allowed, but not both.
> > 
> > Yeah, I read this RFC part and IMHO it's quite stupid. IIRC here is no
> > such restriction for AUTH command, why APOP should be different ?
> 
> I thought the same.. And I don't see a "MUST" there, so maybe it's not
> that important.
> 
> Anyway, I committed the patch with several other changes to implement
> dovecot-auth-trusted challenge.
> 
> There's still one problem. It's possible that connecting to dovecot-auth
> takes longer than accepting a POP3 client. In that case
> get_apop_challenge() fails because it doesn't know about auth
> connections yet. So, the greeting string should really be delayed until
> all auth connections are done. I left it there as FIXME, but moving it
> into clients_notify_auth_connected() probably would fix it..
> 
> I didn't actually test any of my changes, so it might be broken as
> well..
 
Hmm, it's really broken:

Jul  5 12:39:22 pazke dovecot: pop3-login: APOP auth connection lost [80.254.111.17]

On the client side I see that connection is closed immediately after APOP command.
I'll try to trace it down some time later.

-- 
Andrey Panin		| Linux and UNIX system administrator
pazke at donpac.ru		| PGP key: wwwkeys.pgp.net
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