'layer 2 captive portal questions'

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List:       freebsd-ipfw
Subject:    layer 2 captive portal questions
From:       Mike Bloom <mike () databloom ! com>
Date:       2008-04-14 13:50:45
Message-ID: 48036135.1080707 () databloom ! com
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Hi All,

I'm replacing a commercial java sesm capture portal with location 
specific vlans with ipfw and I'd like to allow a user to enter their 
credentials to a webserver running on the gateway of their local vlan, 
and be allowed to surf as long as their mac address and ip address stay 
the same.

so far I have a working ip layer captive portal as such:

00100 228 49451 divert 8668 ip from any to any via fxp0
00100  40  6771 allow ip from 10.1.4.5 to any
00200   0     0 fwd 10.1.4.1,8080 tcp from any to any dst-port 80 in
00300 296 77558 allow ip from any to any
00400   0     0 deny ip from any to any
65535 294 25712 deny ip from any to any

fxp0 is WAN, 10.1.4.1 is the gateway ip for my vlan's subnet. 

If I do a 

00100  40  6771 allow ip from 10.1.4.5 to any

before the fwd statement, my user is free to browse the web without the capture \
portal.

However, what I would like to do is lock down their mac address (which I collect from \
arping their ip on the vlan interface) **and** ip.

as such:

00100   0      0 allow ip from 10.1.4.5 to any via vlan4 MAC 00:1b:63:ac:3a:84 any
00100   0      0 allow ip from 10.1.4.5 to any via vlan4 MAC any 00:1b:63:ac:3a:84

I think I'm mixing layer2 and layer 3 criteria and probably I just need to seperate \
these rules out by blocking layer2 between fxp0 and vlan4 (where the 10.1.4.x subnet \
exists) **then** allowing ip through via the previously mentioned scheme.

Any thoughts or suggestions would be greatly appreciated.

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