SimpleCredsAuth: support multiple uids or gids

[tiran]

SimpleCredsAuth is a bit inflexible and only supports checking of a single uid or gid. Access is allowed if user has either uid or gid as effective uid/gid. It would be rather simple to expand SimpleCredsAuth to support multiple uids and gids easily and have additional flag to switch from OR to AND. Access rule would be:

cred_euid in uids or cred_egid in gids

or

cred_euid in uids and cred_egid in gids

Perhaps a ExtendedCredsAuth class?

[simo5]

I think just listing multiple ids is fine.
If both cred_quid and cred_egid are set then at least one of the uids and at least one of the gids must match, no need for complex and/or flags.

[tiran]

Do you prefer a new plugin or would you like me to add multiple ids to SimpleCredsAuth?

The SimpleCredsAuth has if self.gid == gid or self.uid == uid:.

[simo5]

improve SimpleCredsAuth please