Re: [Imap-protocol] UW-IMAPD and its interpretation of ESEARCH

On Thu, 06 Jun 2013 15:15:32 -0500, Jan Kundrát wrote:
| Hi,
| one of my users has reported [1] that his IMAP server (UW-IMAPD,
| reporting as "2007e.404" in the initial greetings) is using the
| wrong [2] interpretation of the ESEARCH extension -- always
| reporting the UIDs as "min:max", effectively removing the huge
| benefit of that extension.
| 
| What is the least damaging way to work around this? Here's a couple of ideas:
| 
| a) Detect ESEARCH response passed as min:max. When the number of
| messages exceeds what EXISTS reports, blacklist the ESEARCH
| extension and try once again using plain SEARCH.
| 
| b) Resort to ugly user-agent-sniffing-alike and blacklist ESEARCH
| preemptively when the initial greetings contains the "IMAP4rev1
| 2007e.404 at" string *and* the "SCAN" capability is present.
| 
| The option b) looks like a reasonable stopgap measure with a very
| limited potential for false positives. It is also implementable very
| quickly within my client. The option a) will require a bit more
| work, but it looks like something more "robust" than b).
| 
| Is there some inherent drawback in -- at least temporarily -- going
| with b) that I might be missing? It's an obsolete, unmaintained
| server with not that great market share, so implementing extra
| workarounds just for it are not terribly high on my list of
| priorities...

Take a look at Panda IMAP at

  http://github.com/jonabey/panda-imap

that repo includes the very last version of Mark Crispin's personal
fork of UW IMAP that he did after he was laid off from UW.  I know he
fixed a lot of non-security related stuff in his code that was never
back-ported into UW IMAP.

If it turns out that the bug you're describing is still in this code,
I'd be happy to work on fixing it / accepting patches to fix it.

Thanks,

 Jon

-- 
-------------------------------------------------------------------------------
Jonathan Abbey 				              [email protected]
Applied Research Laboratories                 The University of Texas at Austin
GPG Key: 71767586 at keyserver pgp.mit.edu, http://www.ganymeta.org/workkey.gpg

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