GSSAPI Key Exchange Patch for OpenSSH 4.7p1

Simon Wilkinson
Thu, 27 Sep 2007 21:33:49 -0000

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Hi,

I'm pleased to (finally) announce the availability of my GSSAPI Key
Exchange patch for OpenSSH 4.7p1. Whilst OpenSSH contains support for
doing GSSAPI user authentication, this only allows the underlying
security mechanism to authenticate the user to the server, and
continues to use SSH host keys to authenticate the server to the
user. For many sites who already have security infrastructures such
as Kerberos deployed, managing large numbers of SSH host keys is an
additional, unneccessary, burden. GSSAPI key exchange allows the use
of security mechanisms such as Kerberos to authenticate the server to
the user, removing the need for trusted ssh host keys, and allowing
the use of a single security architecture.

This patch adds support for the RFC4462 GSSAPI key exchange
mechanisms to OpenSSH, along with adding some additional features to
the GSSAPI code that is already in the tree.

The patch implements:
   *) gss-group1-sha1-*, gss-group14-sha1-* and gss-gex-sha1-* key
exchange mechanisms. (#1242)
   *) Support for the null host key type (#1242)
   *) Support for CCAPI credentials caches on Mac OS X (#1245)
   *) Support for better error handling when an authentication
exchange fails due to server misconfiguration (#1244)
   *) Support for GSSAPI connections to hosts behind a round-robin
load balancer (#1008)
   *) Support for GSSAPI connections to multi-homed hosts, where each
interface has a unique name (#928)

(bugzilla.mindrot.org bug numbers are in brackets)

There are no code changes since the previous release.

As usual, the code is available from
http://www.sxw.org.uk/computing/patches/openssh.html

I'm also interesting in hearing from people who might be interested
in testing some new cascading credentials delegation code. When you
renew your Kerberos credentials on the client, this code will
automatically propagate these renewed credentials to the server,
allowing the seamless renewal of credentials across ssh sessions
distributed across many different machines. If you have an interest
in testing this code in a non-production environment, please let me
know!

Cheers,

Simon.

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