I'm trying to make a bridge firewall that allows ssh in, and allows http/https
out, but nothing else... ebtable ruleset isn't working Sad
This is what I have so far. When I set the default policy to allow everything
gets through, when deny nothing gets through:
Here is the net setup: squid/sshserver --> eth1 [firewall] eth0 ---> Internet
What is supposed to be allowed:
ssh server (port 22 TCP) <--eth1 [firewall] eth0 <--- Internet
ssh/squidserver --> eth1 [firewall] eth0 --> Internet (ports 80 and 443 TCP)
What is supposed to be disallowed
(spoofed ip w/o proper squidserver mac address going out)
(anything else coming in)
(probably anything else going out aswell (maybe allow dns, dhcp)
This blocks EVERYTHING. It COMPLETELY IGNORES THE RULESET :( :( (The only
thing it doesn't ignore is the policy)
[code]
ebtables -F FORWARD
ebtables -P FORWARD DROP
ebtables -A FORWARD -p ip --ip-proto icmp -j DROP ## block all ICMP
ebtables -A FORWARD -i eth0 -o eth1 -p ip --ip-proto tcp --ip-destination-port
22 --ip-destination 192.168.0.21 -j ACCEPT
ebtables -A FORWARD -i eth1 -o eth0 -p ip --ip-proto tcp --ip-source-port 22
--ip-source 192.168.0.21 -j ACCEPT
ebtables -A FORWARD -p ip --ip-src 192.168.0.21 -s ! 00:08:0D:54:13:C9 -j DROP
ebtables -A FORWARD -i eth0 -o eth1 -p ip --ip-destination 192.168.0.21
--ip-proto tcp --ip-source-port 80 -j ACCEPT
ebtables -A FORWARD -i eth1 -o eth0 -p ip --ip-source 192.168.0.21 --ip-proto
tcp --ip-destination-port 80 -j ACCEPT
ebtables -A FORWARD -i eth0 -o eth1 -p ip --ip-destination 192.168.0.21
--ip-proto tcp --ip-source-port 443 -j ACCEPT
ebtables -A FORWARD -i eth1 -o eth0 -p ip --ip-source 192.168.0.21 --ip-proto
tcp --ip-destination-port 443 -j ACCEPT
[/code]
Why doesn't this work? Isn't it supposed to consider the exception rules?
(I'm testing by trying to SSH to the box, and trying to go to the IP of a
webserver across the bridge from the box)
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