Date: Wed, 27 Jul 2016 23:31:04 +0800 From: Julian Elischer <julian@freebsd.org> To: "Dr. Rolf Jansen" <rj@obsigna.com>, freebsd-ipfw@freebsd.org Subject: Re: ipfw divert filter for IPv4 geo-blocking Message-ID: <677900fb-c717-743f-fcfe-86b603466e33@freebsd.org> In-Reply-To: <C0CC7001-16FE-40BF-A96A-1FA51A0AFBA7@obsigna.com> References: <61DFB3E2-6E34-4EEA-8AC6-70094CEACA72@cyclaero.com> <CAHu1Y739PvFqqEKE74BjzgLa7NNG6Kh55NPnU5MaA-8HsrjkFw@mail.gmail.com> <4D047727-F7D0-4BEE-BD42-2501F44C9550@obsigna.com> <c2cd797d-66db-8673-af4e-552dfa916a76@freebsd.org> <9641D08A-0501-4AA2-9DF6-D5AFE6CB2975@obsigna.com> <4d76a492-17ae-cbff-f92f-5bbbb1339aad@freebsd.org> <C0CC7001-16FE-40BF-A96A-1FA51A0AFBA7@obsigna.com>
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On 27/07/2016 9:36 PM, Dr. Rolf Jansen wrote: >> Am 26.07.2016 um 23:03 schrieb Julian Elischer <julian@freebsd.org>: >> On 27/07/2016 3:06 AM, Dr. Rolf Jansen wrote: >>> There is another tool called geoip , that I uploaded to GitHub, and that I use for looking up country codes by IP addresses on the command line. >>> >>> https://github.com/cyclaero/ipdb/blob/master/geoip.c >>> >>> This one could easily be extended to produce sorted IP ranges per CC that could be fed into tables of ipfw. I am thinking of adding a command line option for specifying CC's for which the IP ranges should be exported, something like: >>> >>> geoip -e DE:BR:US:IT:FR:ES >>> >>> And this could print sorted IP-Ranges belonging to the listed countries. For this purpose, what would be the ideal format for directly feeding the produced output into ipfw tables? >> The format for using tables directly is the same as that used for routing tables. >> … >> table 5 add 1.1.1.0/32 1000 >> … >> your application becomes an application for configuring the firewall. >> (which you do by feeding commands down a pipe to ipfw, which is started as 'ipfw -q /dev/stdin') > I finished adding a second usage form for the geoip tool, namely generation of ipfw table construction directives filtered by country codes. wow, wonderful! with that tool, and ipfw tables we have a fully functional geo blocking/munging solution in about 4 lines of shell script. > ______________ > $ geoip -h > geoip v1.0.1 (16), Copyright © 2016 Dr. Rolf Jansen > > Usage: > > 1) look-up the country code belonging to an IPv4 address given by the last command line argument: > > geoip [-r bstfile] [-h] <dotted IPv4 address> > <IPv4 address> a dotted IPv4 address to be looked-up. > > 2) generate a sorted list of IPv4 address/masklen pairs per country code, formatted as ipfw table construction directives: > > geoip -t [CC:DD:EE:..] [-n table number] [-v table value] [-r bstfile] [-h] > > -t [CC:DD:EE:..] output all IPv4 address/masklen pairs belonging to the listed countries, given by 2 letter > capital country codes, separated by colon. An empty CC list means any country code. > -n table number the ipfw table number between 0 and 65534 [default: 0]. > -v table value the 32-bit unsigned value of the ipfw table entry [default: 0]. > > valid arguments in both usage forms: > > -r bstfile the path to the binary file with the consolidated IP ranges that has been. > generated by the 'ipdb' tool [default: /usr/local/etc/ipdb/IPRanges/ipcc.bst]. > -h show these usage instructions. > ______________ > > With that, the ipfw configuration script may contain something alike: > > … > # allow only web access from DE, BR, US: > /usr/local/bin/geoip -t DE:BR:US -n 7 | /sbin/ipfw -q /dev/stdin > /sbin/ipfw -q add 70 deny tcp from not table\(7\) to any 80,443 in recv WAN_if setup > … > > OR, the other way around: > … > # deny web access from certain disgraceful regions: > /usr/local/bin/geoip -t KO:TR:SA:RU:GB -n 66 | /sbin/ipfw -q /dev/stdin > /sbin/ipfw -q add 70 allow tcp from not table\(66\) to any 80,443 in recv WAN_if setup > … > ____________ > > > Best regards > > Rolf > > > >
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