Farid Hamjavar wrote:

[snip]
> How does one let DenyHosts know that certain set of users are
> always allowed to get in?

As others have said, it's not a DenyHost function, it is ssh + tcp_wrappers:

man 5 hosts_access :

"...
       o      Access  will  be  granted when a (daemon,client) pair matches an
              entry in the /etc/hosts.allow file.
...
CLIENT USERNAME LOOKUP
       When  the  client  host  supports  the  RFC  931 protocol or one of its
       descendants (TAP, IDENT, RFC 1413) the wrapper  programs  can  retrieve
       additional information about the owner of a connection. Client username
       information, when available, is logged together with  the  client  host
       name, and can be used to match patterns like:

          daemon_list : ... [EMAIL PROTECTED] ...

       The  daemon wrappers can be configured at compile time to perform rule-
       driven username lookups (default) or to always interrogate  the  client
       host.   In  the  case  of  rule-driven username lookups, the above rule
       would cause username lookup only when  both  the  daemon_list  and  the
       host_pattern match.
..."

The key in your question is "always allowed", if a user makes a mistake the
hosts.allow file will have the effect of still allow him to try as many times as
needed, AllowUsers / AllowGroups does not (and puts a restriction in everybody
else).

I've only used something similar (AllowUsers [EMAIL PROTECTED]) and it works 
very
well, I have no experience with using this in hosts.allow but it probably works
just as well.
-- 
René Berber


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