New feature proposal: IP address fixing

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All,

I'm considering adding another feature to the 2.x version of
securityfilter. Let me know what you think.

Some web sites allow you to enable "IP address checking" or something
sounding like that. Basically, your session will be tied to your IP
address for extra security. That way, even if someone can guess your
session id and submit it along with a request, they can't hijack your
session.

This will, or course, be optional to the user using the website. Some
services like AOL use proxies for dialup traffic and that really screws
things up when it comes to IP validation.

My plan is simply to store the remote user's IP address in the session
and check against that as part of the authorization step (actually, it's
before the authorization, but after authentication because that is tied
to the realm, and I'd like to do this checking in a single place).

I'll invent a default check-ip-address request parameter name and make
it changeable via either a filter config-param or through the XML
configuration file. (I think for sf 2.0 I'll go with a filter config
param and for a future version, I'll go for an XML element, but comments
are appreciated).

If that parameter has any value during login (or a specific value... I'd
appreciate some feedback here), then we'll turn on this feature for the
current session, and it will stay enabled until the session expires.

Any feedback on this is certainly welcome.

Thanks,
- -chris
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