Sunday, May 29, 2011

Install l7-filter module for Iptables

To use menuconfig:

yum install -y ncurses-devel
Download required packages
Download L7-filter kernel


Download L7-filter Protocol definitions

wget definitions/2009-05-28/l7-protocols-2009-05-28.tar.gz
Download Linux Iptables 1.4.0
Download Linux Kernel 2.6.26
Extract it:
tar xvf linux-2.6.26.tar.bz2
tar xvf netfilter-layer7-v2.19.tar.gz
Apply patch to Linux kernel source
cd linux-2.6.26
patch -p1 < ../netfilter-layer7-v2.19/kernel-2.6.25-layer7-2.19.patch

Apply patch & install iptables 1.4.0

tar -xvf iptables-1.4.0.tar.bz2
cd iptables-1.4.0
patch -p1 < ../netfilter-layer7-v2.19/iptables-1.4-for-kernel-2.6.20forward-layer7-2.19.patch
chmod +x extensions/.layer7-test
=== modified file 'extensions/libxt_sctp.c'


make KERNEL_DIR=~/linux-2.6.26
make install KERNEL_DIR=~/linux-2.6.26

Installing protocol definitions

tar -xvf l7-protocols-2008-04-23.tar.gz
cd l7-protocols-2008-04-23
mkdir /etc/l7-protocols
cp protocols/* /etc/l7-protocols

Compiling & installing new linux kernel

cd linux-2.6.26
make menuconfig

* "Network packet filtering framework(Netfilter)" (Networking → Networking option)
* "Netfilter connection tracking support" (... → Network packet filtering framework(Netfilter) → Core Netfilter Configuration)
* "Connection tracking flow accounting" (on the same screen)
* Finally, "Layer 7 match support"

make all
make modules_install
make install

Check GRUB setting

vim /etc/grub.conf

title CentOS (2.6.26)
        root (hd0,0)
        kernel /vmlinuz-2.6.26 ro root=/dev/VolGroup00/LogVol00 rhgb quiet
        initrd /initrd-2.6.26.img
title CentOS (2.6.18-53.el5)
        root (hd0,0)
        kernel /vmlinuz-2.6.18-53.el5 ro root=/dev/VolGroup00/LogVol00 rhgb quiet
        initrd /initrd-2.6.18-53.el5.img

Finally, restart the system:
init 6

Test l7-filter
iptables -m layer7 --help

Thanks for reading
All my Lab:
Linux Lab -- window and Cisco Lab
to be continued - I will update more. 

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