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Running a 2 stage iptables (drop all, start devices, set allow rules) |
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sounds like a good idea to me. |
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That would not be the most paranoid security measure I have seen. |
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Graham Murray wrote: |
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> Jon Mitchell <junk@×××××××.uk> writes: |
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> |
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>> The current behaviour of a default Gentoo install is to load iptables |
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>> after the network has been initialised. Upon shutting down likewise |
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>> iptables is shutdown then the network interface. This strikes me as |
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>> presenting a window of opportunity when the computer is exposed without |
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>> iptables, albeit a small one. |
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>> |
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>> Do people on this list think there is any value in re-arranging this |
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>> order by default? |
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> |
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> The problem with doing the other way is that iptables rules can |
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> reference the specific interfaces to which the rule applies. This will |
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> (AFAIK) fail if the interface does not exist when the rule is |
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> created. Therefore iptables has to be started after the network. |
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> |
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> The other alternative is to have a 2-stage iptables |
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> initialisation. The first stage being run and setting the INPUT and |
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> FORWARD table policies to DROP (and it may also be necessary to set |
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> some rules to all the lo interface, I am not sure). The second stage |
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> being run after the network interfaces are configured and setting the |
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> actual rules. |
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