Question restricting ssh access for some users only

I've used ssh as a secure telnet up to now but done little else with
it. The FreeBSD machines I look after on our internet-facing network
all have one account which I connect to for administration. I've set
up /etc/hosts.allow on all the machines to only allow ssh from a
limited internal network range.

Now I want to create a new account on one machine which will be
accessible from the Internet as a whole, to be used for tunnelling of
SMTP and POP3. I can't predict what the client IP address will be so I
will have to remove the hosts.allow restriction. Is there any way I
can:

- still prevent connections to my admin user from anywhere except a
  restricted set of addresses

- disallow shell access for the new account but still allow tunnelling

I think I can solve the first problem by using a new login class and
an entry in login.conf, but there may be better ways.

I think I can solve the second by giving the new user a shell of
/bin/cat (putting that in /etc/shells) but again there may be a neater
way.

jim
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