Spurious error message in SSH authentication

[Thomi Richards]

When authenticating with the SSH smart server, it is possible for the user to get a spurious error message that says:

Authentication error for user thomi: Your SSH key does not match any key registered for Sloecode user thomi.

This happens when the user has more than one SSH key pair (for example, an RSA key and a DSA key), but only registers one of these keys with the sloecode system. If the key that is not registered with sloecode is tried first, the error message will be returned, and then the second key will be successfully used to authenticate the client.

The problem in the code is that in sloecode/sshserver/auth.py, we report errors for each key, rather than collecting errors and reporting them at the point when authentication has failed.