系统环境
RHEL5 [2.6.18-164.el5]
软件环境
http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.25.19.tar.bz2
http://www.netfilter.org/projects/iptables/files/iptables-1.4.2.tar.bz2
http://ie.archive.Ubuntu.com/sourceforge/l/l7/l7-filter/netfilter-layer7-v2.20.tar.gz
http://ie.archive.ubuntu.com/sourceforge/l/l7/l7-filter/l7-protocols-2008-10-04.tar.gz
目标功能
为iptables增加layer7补丁,实现应用层过滤。
一、重新编译内核
1、将所需软件下载并上传到家目录
[root@localhost ~]# ll
总计 99824
-rw——- 1 root root 1175 08-30 04:50 anaconda-ks.cfg
drwxr-xr-x 2 root root 4096 08-30 21:14 Desktop
-rw-r–r– 1 root root 35236 08-30 04:50 install.log
-rw-r–r– 1 root root 3995 08-30 04:49 install.log.syslog
-rw-r–r– 1 root root 435891 09-18 11:43 iptables-1.4.2.tar.bz2
-rw-r–r– 1 root root 128196 09-18 11:43 l7-protocols-2008-10-04.tar.gz
-rw-r–r– 1 root root 48622017 09-18 11:43 linux-2.6.25.19.tar.bz2
-rw-r–r– 1 root root 174790 09-18 11:43 netfilter-layer7-v2.20.tar.gz
2、合并kernel+layer7补丁
[root@localhost ~]# tar jxvf linux-2.6.25.19.tar.bz2 -C /usr/src/
[root@localhost ~]# tar zxvf netfilter-layer7-v2.20.tar.gz -C /usr/src/
[root@localhost ~]# cd /usr/src/linux-2.6.25.19/
[root@localhost linux-2.6.25.19]#patch -p1 < /usr/src/netfilter-layer7-v2.20/kernel-2.6.25-layer7-2.20.patch
3、配置新内核
[root@localhost linux-2.6.25.19]# cp /boot/config-2.6.18-164.el5 .config //沿用旧的内核
[root@localhost linux-2.6.25.19]# make menuconfig
//配置内核时,在“Networking —> Networking Options —> Network Packet filtering framework (Netfilter) ”处主要注意两个地方:
1) —> Core Netfilter Configuration
//将“Netfilter connection tracking suport (NEW)”选择编译为模块(M),需选取此项才能看到layer7支持的配置。
//将layer7、string、state、time、IPsec、iprange、connlimit,tcp……等编译成模块。
2) —> IP: Netfilter Configuration
//将“IPv4 connection tracking support (require for NAT)”编译成模块。
//将“Full NAT”下的“MASQUERADE target support”和“REDIRECT target support”编译成模块。
4、编译及安装模块、新内核
[root@localhost linux-2.6.25.19]make && make modules_install && make install
5、编译安装成后,重启选择使用新的内核(2.6.25.19)引导系统
二、重新编译iptables
1、将原来的iptables备份
[root@localhost ~]# uname -r
2.6.25.19 //查看内核版本
[root@localhost init.d]# cp iptables iptables.bak
[root@localhost init.d]# iptables //查看原来的iptables版本
iptables v1.3.5: no command specified
Try `iptables -h’ or ‘iptables –help’ for more information.
2、卸载现有iptables
[root@localhost init.d]# rpm -e iptables –nodeps
warning: /etc/sysconfig/iptables-config saved as /etc/sysconfig/iptables-config.rpmsave
3、合并iptables+layer7补丁
[root@localhost ~]# tar -jxvf iptables-1.4.2.tar.bz2 -C /usr/src/
[root@localhost ~]# cd /usr/src/netfilter-layer7-v2.20/iptables-1.4.1.1-for-kernel-2.6.20forward/
[root@localhost iptables-1.4.1.1-for-kernel-2.6.20forward]# ll
总计 16
-rw-r–r– 1 1000 1000 9356 2008-08-22 libxt_layer7.c
-rw-r–r– 1 1000 1000 648 2008-08-22 libxt_layer7.man
[root@localhost iptables-1.4.1.1-for-kernel-2.6.20forward]# cp * /usr/src/iptables-1.4.2/extensions/
4、编译安装
[root@localhost iptables-1.4.1.1-for-kernel-2.6.20forward]# cd /usr/src/iptables-1.4.2/
[root@localhost iptables-1.4.2]# ./configure –prefix=/ –with-ksouce=/usr/src/linux-2.6.25.19/
[root@localhost iptables-1.4.2]# make && make install
5、将原备份iptables还原
[root@localhost iptables-1.4.2]# mv /etc/init.d/iptables.bak /etc/init.d/iptables
[root@localhost iptables-1.4.2]# ll /etc/init.d/iptables
-rwxr-xr-x 1 root root 7460 09-18 17:24 /etc/init.d/iptables
6、启动iptables
[root@localhost ~]# service iptables restart
7、安装l7-protocols模式包
[root@localhost ~]# tar -zxvf l7-protocols-2008-10-04.tar.gz -C /etc/
[root@localhost ~]# mv /etc/l7-protocols-2008-10-04 /etc/l7-protocols
8、测试
[root@localhost ~]# iptables -t filter -A FORWARD -m layer7 –l7proto qq -j DROP
[root@localhost ~]# iptables -L