Support for GSSAPI authentication

[badlop]

There was a long-standing feature request in the old JIRA bug tracking system:
https://support.process-one.net/browse/EJAB-831 GSSAPI authentication

I attach here the latest working patch and a backup of the conversation.
831-fixed.patch.txt
831-conversation.txt

This patch was not included in ejabberd main repository because nobody at ProcessOne knows enough about GSSAPI to review and maintain the code, and apparently no known collaborator either.

If at least a tester were available, it would be interesting to try to rework the code so most of it can be committed to ejabberd-contrib, and the barely minimum to ejabberd main repo.

[debalance]

Thanks @badlop for bringing this up again!
I'll contact the people from the according wishlist bug in Debian (https://bugs.debian.org/590503) and direct them here.

[debalance]

@badlop, I cannot build your fork of esasl on Debian sid (using automake 1.15):

esasl$ ./bootstrap
configure.ac:27: installing 'config/install-sh'
configure.ac:27: installing 'config/missing'
configure.ac:51: error: required file 'esasl/Makefile.in' not found
configure.ac:51: error: required file 'esasl/priv/Makefile.in' not found
configure.ac:51: error: required file 'esasl/src/Makefile.in' not found

esasl$ automake -a -c
configure.ac:51: error: required file 'esasl/Makefile.in' not found
configure.ac:51: error: required file 'esasl/priv/Makefile.in' not found
configure.ac:51: error: required file 'esasl/src/Makefile.in' not found

[lemenkov]

Hello! I've got a working patch-set based on this one (we've tested it very recently in a real Kerberos infrastructure):

https://github.com/lemenkov/ejabberd/commits/fedora-16.12-gssapi-test

I can squash them down and make a PR.

[samweisgamdschie]

Hi there!

Is there a way to add another efforts to implement this awesome feature?

We will really appreciate it!

[Neustradamus]

I would like news too.

[Neustradamus]

@dequbed has added a PR: processone/xmpp#56: WIP, thanks!