DCE authentication patch (version 1.0) for uwash imapd
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This patch adds DCE authentication support to uwash imapd. (While the stock
distribution has some DCE support, it does not attach credentials to the
imapd process and therefore is not useful for mail stored in DFS). It
also adds a new define, HOMEDIRMAIL, to more easily configure imapd to
retrieve and store mail in alternate locations, usually the users home
directory.


To apply the patch, acquire and untar the imap distribution (available at
ftp://ftp.cac.washington.edu/mail/imap-4.5.tar.Z), change into
the imap-4.5 directory and type:

patch -p1 -d . < /path/to/imap-4.5-dce-1.0.diff


Note: once the patch is applied, non-DCE ports will fail to compile.
In order to purge credentials when the server exits, I added a new function,
server_logout(), which is called at rundown. As none of the other auth
modules support this function, imapd will fail to link. This is easily
fixed by adding "#define server_logout()" to the top of the source code
for each other auth module, but I haven't had the time to do that yet.
Arguably, I could have fixed this problem in about the same amount of time
I took to describe it. Oh well.


This patch has only been tested under Solaris, and the only DCE ports
currently supported are gsd25 and gsd26, "GCC Solaris with DCE/DFS support",
for Solaris 2.5 and Solaris 2.6, respectively. It should be very simple to
add a port for other vendors. If you need a hand, feel free to send me email.


If you leave HOMEDIRMAIL defined, you will want to edit the file
src/osdep/unix/env_unix.c to use the correct values for imap home
directory and system inbox at your site. The default values are correct
for my site, where mail is delivered to ~/.mail/mail, and imap folders
are stored in ~/.mail/imap.


The latest version of this patch is available from:

http://www.csupomona.edu/~henson/www/projects/dce_patches/imap/


If your OS doesn't support DCE as a naming service, you will need to
replicate your registry in local files for imapd to work. Solaris
users can install my nss_dce package to integrate DCE into the Solaris
naming service switch:

http://www.csupomona.edu/~henson/www/projects/nss_dce/


Changes
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1.0 - Updated to support imap-4.5

0.5 - First publically released version.


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   Copyright (C) 1997-99 Paul Henson <henson@acm.org>

   This patch is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 1, or (at your option)
   any later version.

   This patch is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   For a copy of the GNU General Public License, write to the Free
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

   The GNU General Public License is, as of this writing, also available
   at http://www.irsociety.com/webchat/gnu.html