Ever thought that there should be an automated way to handle ssh keys? Do you know the administrators of your servers, and wish that SSH could verify new host keys from them automatically, based on your personal connections to the web-of-trust? Do you wish you could revoke and rotate your old SSH authentication keys without having to log into every single machine?
Do you administer servers, and wish you could re-key them without sowing massive pain and confusion among your users (or worse, encouraging bad security habits among them)? Do you wish you could grant access to your users by name, instead of by opaque string? Do you wish you could rapidly revoke access to a user (or compromised key) across a group of machines by disabling authentication for that user?
A group of us have been working on a public key infrastructure for
SSH. Monkeysphere makes use of
the existing OpenPGP web-of-trust to fetch and cryptographically
validate (and revoke!) keys. This works in either directions: both
authorized_keys and known_hosts are
handled. Monkeysphere gives users and admins tools to deal with SSH
keys by thinking about the people and machines to whom the keys
belong, instead of requiring humans to do tedious (and error-prone)
manual key verification.
We have debian packages available which should install against lenny, a mailing list, and open ears for good questions, suggestions and criticism.
If you have a chance to give it a try (as a user or as an admin), it would be great to get feedback.