[squid]屏蔽迅雷協議
迅雷會向WEB服務提交如下HTTP請求頭：
POST / HTTP/1.1
Host: 58.61.39.206:80
Content-type: application/octet-stream
Content-Length: 140
Connection: Keep-Alive
Squid配置如下：
acl IP dstdom_regex [0-9]$
acl ROOT urlpath_regex ^/$
acl POST method POST
acl Octet_Stream req_mime_type application/octet-stream
http_access deny IP ROOT POST Octet_Stream
linux+squid利用Layer7限制迅雷下載、QQ、MSN方法
http://www.humin.com.cn/limited-use-of-linux-squid-thunder-download-qq-msn-method.html
L7-filter (Application Layer Packet Classifier for Linux), 是 Linux netfilter 的外掛模塊, 它能使 Linux 的 iptables 支持 Layer 7 (Application 應用層) 過濾功能, 限制封殺 P2P、即時通訊軟件。
Centos 4.4
Kernel 2.6.9-42.0.3.EL
Iptables 1.2.11
1.下載所需軟件包：
kernel 2.6.19.7
# wget http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.19.7.tar.bz2
iptables 1.3.7
# wget http://www.netfilter.org/projects/iptables/files/iptables-1.3.7.tar.bz2
L7-filter http://sourceforge.net/project/showfiles.php?group_id=80085
netfilter-layer7-v2.12.tar.gz
l7-protocols-2007-06-22.tar.gz
2.配置編譯新內核
首先將所下載的軟件都放置於/usr/src目錄下
# tar zxvf netfilter-layer7-v2.12.tar.gz
# tar xjvf linux.2.6.19.7.tar.bz2
# ln -s linux.2.6.19.7 linux
# cd linux
# patch -p1 < /usr/src/netfilter-layer7-v2.9/kernel-2.6.18-2.6.19-layer7-2.9.patch (打L7-filter的內核補丁)
# make oldconfig
(如果之前曾經編譯過，需要先執行 make mrproper 。make oldconfig會自動對比之前的kernel config，根據之前版本的配置生成一個kernel config，這樣方便我們在編譯新核心的時候，無須在從頭修改所有的核心設置）
# make menuconfig 設定內核參數，具體參數可以參考這篇文章 內核編譯詳解
核心不同，內核選項的排列方式有可能不一樣，仔細找一下可以找到：
Code maturity level options –> [*] Prompt for development and/or incomplete code/drivers
Networking –> Networking options –>
[*] Network packet filtering (replaces ipchains) –>
IP: Netfilter Configuration –>
Connection tracking (required for masq/NAT)
[*] Connection tracking flow accounting
IP tables support (required for filtering/masq/NAT)
Layer 7 match support
# make
# make modules
# make modules_install
# make install
# reboot
# uame -a
Linux jason.10235 2.6.19.7 #1 Fri Jul 6 11:56:11 CST 2007 i686 i686 i386 GNU/Linux
系統已經更新至新內核 2.6.19.7
3.更新升級Iptalbes的Layer7補丁
# cd /usr/src
# tar xjvf iptables-1.3.7.tar.bz2
# cd iptables-1.3.7
# patch -p < ../netfilter-layer7-v2.0/iptables-layer7-2.0.patch
# chmod +x extensions/.layer7-test
# export KERNEL_DIR=/usr/src/linux-2.6.19.7
# export IPTABLES_DIR=/usr/src/iptables-1.3.7
# make BINDIR=/sbin LIBDIR=/lib MANDIR=/usr/share/man install
# iptables -V
iptables v1.3.7 已經更新至新版本
4. 安裝Layer7 協議文件
# cd /usr/src
# tar zxvf l7-protocols-2007-06-22.tar.gz
# cd l7-protocols-2007-06-22
# make install
5.使用iptables layer-7 filter：
# iptables -t mangle -I PREROUTING -m layer7 –l7proto edonkey -j DROP (禁止edonkey)
# iptables -t mangle -I PREROUTING -m layer7 –l7proto bittorrent -j DROP (禁止bt)
# iptables -t mangle -I PREROUTING -m layer7 –l7proto qq -j DROP (禁止QQ通訊)
# iptables -t mangle -I PREROUTING -m layer7 –l7proto msnmessenger -j DROP (禁止edonkey)
# iptables -t mangle -I PREROUTING -m layer7 –l7proto xunlei -j DROP (禁止迅雷)
# iptables -t mangle -I PREROUTING -m layer7 –l7proto kugoo -j DROP (禁止kugoo)
# iptables -t mangle -I PREROUTING -m layer7 –l7proto yahoo -j DROP (禁止Yahoo! Messenger)