Apache2 Basic Auth: user@ip, user2@ip2 - Is this possible?

Question

I am looking at running an external service for clients to use here in my office while clients are working remotely at their office.

Assumptions: Both my office IP and clients office IP are static.

I wish to allow access to a service, for example an HTTP Basic Auth secured administration application, to my clients.

Is there a way in Apache Basic Auth or otherwise to create User @ IP based restrictions?

I would like:

• me @ my_office
• me @ my_home
• client1 @ their_office1
• client2 @ their_office2

For testing, I have attempted this code:

<Location />
    Satisfy All

    AuthType Basic
    AuthName "Authorisation"
    AuthUserFile /etc/apache2/passwd

    Order deny,allow
    Deny from all
    Allow from 10.0.0.1/32
    Require user me

    Order deny,allow
    Deny from all
    Allow from 10.0.0.2/32
    Require user client1
</Location>

• Testing with [me@10.0.0.1] allowed access, success.
• Testing with [client1@10.0.0.1] allowed access, fail.
• Testing with [client2@10.0.0.1] dis-allowed access, success (client2 is in htpasswd file, but not specified in Require User).

Is there a known way of doing this using Apache Basic Auth?

Also, instead of receiving a "Forbidden" for a successful user/password from an unknown IP, is it possible to ask Apache to request the user details again?