GNU Generic Security Service - Libgss
This page contain information about Generic Security Service (GSS), a free implementation of RFC 2743/2744.
If you do not know what GSS is, I suggest to read the following resources.
- GSSAPIv2u1 specification (RFC 2743)
- GSSAPIv2u1 C bindings (RFC 2744)
- Sun's GSS-API Programming Guide
GSS itself is licensed under GPLv3+, and the manual is licensed under GFDLv1.3+.
Refer to the GSS Manual web page for links to the manual in all formats; however, quick links to the most popular formats:
GSS has received some real-world testing and should be considered beta quality.
The source code framework is in place, an outline of the documentation is ready, and there are some simple self tests. The Kerberos 5 mechanism (RFC 1964 and RFC 4121) supports mutual authentication, channel bindings and the standard DES cipher. The non-standard 3DES cipher is also implemented, but unfortunately there are no specifications for AES. GNU SASL can use GSS to connect to GNU Mailutils and Cyrus IMAP servers that use the GSS implementations from MIT Kerberos or Heimdal. GNU MailUtils can also use GSS to serve GSSAPI clients. A SSH client and server with GSS authentication is provided by LSH with some patches.
GSS is developed for the GNU/Linux system, but runs on over 20 platforms including most major Unix platforms and Windows, and many kind of devices including iPAQ handhelds and S/390 mainframes.
GSS uses GNU Shishi to implement the Kerberos V5 mechanism.
Projects using GSS include:
- 2010-03-30: Version 1.0.0 takes GNU GSS out of alpha testing.
- 2010-03-15: Version 0.1.3 adds support for Kerberos V5 channel bindings, paving the road for GS2-KRB5 support in GNU SASL.
- 2007-06-29: Version 0.0.22 released under the GPLv3.
- 2004-01-22: New releases are no longer announced here. Instead, read help-gss or check the release directory from time to time. By the way, GSS 0.0.10 was just released.
- 2004-01-15: Version 0.0.9 released, several new features, API documentation using GTK-DOC.
- 2004-01-11: Version 0.0.8 released, various bug fixes and major documentation revamp.
- 2004-01-01: Savannah had problems last month, and still isn't operating fully. CVS has been moved to a private machine, a read-only mirror of it will hopefully be available via Savannah in the future.
- 2003-11-26: Version 0.0.7 released, fixes a problem prohibiting 3DES gss_wrap from working.
- 2003-09-22: Version 0.0.6 released, accompanies Shishi 0.0.7.
- 2003-09-16: GSSLib can be used by OpenSSH in client mode to support Kerberos 5 via Shishi, see my page for the OpenSSH GSSLib patch.
- 2003-08-31: Version 0.0.5 released, accompanies Shishi 0.0.4.
- 2003-08-10: Version 0.0.4 released, contains Kerberos 5 improvements and accompanies Shishi 0.0.1.
- 2003-06-30: Added a page with information about SSH authentication using this library.
- 2003-06-28: Version 0.0.2 contains limited server mode support. GNU Mailutils can use GSS for its native GSSAPI authentication in server mode (with this patch), which then interoperate with (at least) the GNU SASL command line client using GSS.
- 2003-06-02: Initial release.
A mailing list where GSS users may help each other exists, and you can reach it by sending e-mail to email@example.com. Archives of the mailing list discussions, and an interface to manage subscriptions, is available through the World Wide Web at http://lists.gnu.org/mailman/listinfo/help-gss.
If you find GSS useful, please consider making a donation. No amount is too small!
The releases are distributed from ftp://alpha.gnu.org/gnu/gss/.
All official releases are signed with an OpenPGP key with fingerprint 0xB565716F.
$ git clone git://git.savannah.gnu.org/gss.git
The online git interface is available.
If you have trouble using git, you may download
a daily snapshot. The
snapshots are prepared similar to regular releases, i.e., you simply
build them using
./configure && make.
Build logs from building the package, where you can also contribute a build system for your own platform, are available from the GSS autobuild page.
See the file README-alpha on how to bootstrap and build the package from version controlled sources.