iptables 下
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Iptables l7应用层过滤
好的,上次我们简单的讨论了下iptales的用法,其中有很多的用法我们都还没说,例如非常重要的SNAT ,DNAT转换,字符匹配过滤,同是定义多端口,最大连接数限制,访问时间限制,匹配速率限制,还有就是现在企业中经常要用到的l7layer应用层过滤!!下面我们来讨论这些非常重要有用但是又很具挑战难度的东东
主要内容:
iptables的实践应用,L7应用层过滤
目标:
熟练应用ipatbles的用法,要做到烂熟于心
我们接着上次继续探讨iptables更深层的用法。这次我们基于上次的理论介绍主要通过实验来熟悉每个命令的用法.
实验环境:
内网2:10.0.2.100 telnet vsftp http
内网1:10.0.1.100
外网:10.0.3.100
firewall:eth0:10.0.2.1 eth1:10.0.3.1 ssh
SNAT DNAT:
Ü SNAT
Ü --to-source IPport
Ü DNAT
Ü --to-destination IP:port
路由测试:
[root@station93 ~]# sysctl -p
net.ipv4.ip_forward = 1
NAT转换测试:
外网访问iptables10.0.3.1端口时,iptables均把地址DNAT成内网10.0.2.100服务器的httpd服务,注意,这里外网不知道内网有10.0.2.100这个地址,只知道10.0.3.1
DNAT 转换;==========》一个IP可实现多个功能
[root@station93 ~]# iptables-t nat -A PREROUTING -s 10.0.3.100 -d 10.0.3.1 -p tcp --dport 80 -j DNAT--to-dest 10.0.2.100
[root@station93 ~]# iptables-t nat -A PREROUTING -s 10.0.3.100 -d 10.0.3.1 -p tcp --dport 22 -j DNAT --to-dest 10.0.1.100
SNAT转化测试:=========è内网用户只需要一个IP地址即可全部上网
内网用户通过iptables外网网关实现SNAT转化的功能
[root@station93 ~]# iptables -t nat-A POSTROUTING -s 10.0.2.100 -p tcp --dport 80 -j SNAT--to-source 10.0.3.1
[root@3 httpd]# tailaccess_log============》这里查看日志时我们会法相其实是10.0.3.1来访问外网服务器的,即iptables的外网网关
10.0.3.1 - -[09/Mar/2010:20:43:59 +0800] "GET / HTTP/1.1" 403 3985 "-" "ELinks/0.11.1(textmode; Linux; 77x24-2)"
基于状态的限制
v -m state
Ü NEW
Ü ESTABLISHED
Ü RELATED
Ü INVALID
只允许3.100访问2.100的web服务,不允许2.100自发的回应3.100的
主要用来防止本机中毒,自发的向外发出信息泄密
[root@station93 ~]# iptables -A FORWARD -s 10.0.3.100 -d 10.0.2.100 -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT
[root@station93 ~]# iptables -R FORWARD 2-s 10.0.2.100 -d 10.0.3.100 -p tcp --sport 80-m state --state ESTABLISHED,RELATED -j ACCEPT
测试:
[root@3 ~]# elinks 10.0.2.100 ======》出现测试页
[root@2 ~]# elinks 10.0.3.100 ========》失败
v -m multiport
Ü --source-portsport1,port2,port3,…
Ü --destination-portsport1,port2,port3,…
Ü --ports port1,port2,port3,…
企业中防火墙的实际应用
在实际的企业应用中,我们以上学习的iptables只是使远远不够的,举个简单的例子,我们在平时的工作中往往需要限制qq,msn,迅雷,快车等聊天下载工具的使用,而我们以上学的都是写非常简单点的限制,而这这些工具的服务器的众多,端口多变,我们通过普通的方法是很难控制住的,银次我们需要给予Layer的第七层应用的控制,这里我们需要重新编译升级内核。
需要的软件包:
v The 2.4 or 2.6 Linux kernel source (2.6 strongly preferred) fromkernel.org
v The iptables source from netfilter.org
v "l7-filter kernel version" package(netfilter-layer7-vX.Y.tar.gz)
v "Protocol definitions"package (l7-protocols-YYYY-MM-DD.tar.gz)
步骤如下:
Ü #tar zxvf linux-2.6.28.10.tar.gz -C /usr/src
Ü # tar zxvf netfilter-layer7-v2.22.tar.gz -C /usr/src
Ü #ln –s /usr/src/linux-2.6.28.10/ /usr/src/linux
Ü # cd /usr/src/linux/
Ü # patch -p1 < ../netfilter-layer7-v2.22/kernel-2.6.25-2.6.28-layer7-2.22.patch
# cp /boot/config-2.6.18-164.el5 /usr/src/linux/.config
# make menuconfig 这里我们需要实现安装好对应的开发包 pirut & 命令编辑
我们需要选择好下面的这些模块:
v Networking support → Networking Options →Network packet filtering framework →Code Netfilter Configuration
Ü <M> Netfilter connectiontracking support
Ü <M> “layer7” match support
Ü <M> “string” match support
Ü <M> FTP protocol support
Ü <M> “time” match support
Ü <M> “iprange” match support
Ü <M> “connlimit” match support
Ü <M> “state” match support
Ü <M> “conntrack” connection match support
Ü <M> “mac” address match support
Ü <M> "multiport" Multiple port matchsupport
v Networking support → Networking Options →Network packet filtering framework → IP: Netfilter Configuration
Ü <M> IPv4 connectiontracking support (required for NAT)
Ü <M> Full NAT
î <M> MASQUERADE target support <M> NETMAP targetsupport <M> REDIRECT targetsupport
v Start compiling and installing
Ü make
Ü make modules_install
Ü make install
v Edit the /boot/grub/grub.conf, set the default booting kernel to thenew kernel
v Restart
v # cp /etc/rc.d/init.d/iptables ~/iptables
v # rpm -e iptables-ipv6 iptables iptstate --nodeps
v # tar jxvf iptables-1.4.6.tar.bz2 –C /usr/src
v # cd /usr/src/iptables-1.4.6
v # cp ../netfilter-layer7-v2.22/iptables-1.4.3forward-for-kernel-2.6.20forward/libxt_layer7.* ./extensions/
v ./configure --prefix=/usr --with-ksource=/usr/src/linux
v make
v make install
v # tar zxvfl7-protocols-2009-05-28.tar.gz
v # cd l7-protocols-2009-05-28
v # make install
v # mv ~/iptables /etc/rc.d/init.d/
v #ln –sv /usr/sbin/iptables /sbin/iptables
v 注意这里第一次启动无法service iptables start 需要先setup,再service iptables start
2.6.28.10 内核中 ip_conntrack_ftp 改名为 nf_conntrack_ftp
加模块: modprobe nf_conntrack_ftp
支持的协议种类:
v bittorrent
Ü P2P filesharing / publishingtool
v edonkey
Ü eDonkey2000 - P2P filesharing
v kugoo
Ü KuGoo - a Chinese P2P program
v msn-filetransfer
Ü MSN (Micosoft Network)Messenger file transfers
v msnmessenger
Ü Microsoft Network chat client
v pplive
Ü Chinese P2P streaming video
v qq
v xunlei
用法
Ü iptables [specify table & chain] -m layer7--l7proto [protocol name] -j [action]
禁止外网访问firewall的web ,ssh,telnet服务
[root@station93~]# iptables -A INPUT -p tcp -m multiport --source-ports 22,25,80 -jDROP
v connlimit
v [!] --connlimit-above n 最大连接数
Ü Allows you to restrict thenumber of parallel connections to a server per client IP address (or clientaddress block).
Ü Example:
î iptables -A INPUT -p tcp --syn--dport 22 -m connlimit --connlimit-above 2 -j REJECT
î Allow 2 ssh connections perclient host
限制外网的最大连接数是2
[root@station93~]# iptables -A OUTPUT -p tcp --syn--dport 22 -m connlimit--connlimit-above 2 -j REJECT
v String
Ü 有两种算法:bm kmp
Ü This modules matches a givenstring by using some pattern matching strategy.
Ü It requires a linux kernel>= 2.6.14.
Ü [!] --string pattern
î Matches the given pattern.
Ü --algo {bm|kmp}
î Select the pattern matchingstrategy. (bm = Boyer-Moore, kmp = Knuth-Pratt-Morris)
Ü Examples:
î iptables –A OUTPUT –p udp --dport 53 -m string --string“verycd” --algo bm -j DROP
î iptables -A OUTPUT -p tcp --dport 80 -m string --string “法轮功” --algo kmp -j DROP
限制内网浏览外网上包含secert 字符串的网页:
[root@3 html]# echo"secert" >> index2.html
[root@3 html]# cat index2.html
secret
this is the second test
secret
[root@station93 ~]# iptables -A FORWARD -s 10.0.2.100 -d 10.0.3.100-p tcp --sport 80 -m string --string "secert" --algo bm -jDROP
v time
Ü This matches if the packetarrival time/date is within a given range.
Ü --datestart YYYY[-MM[-DD[Thh[:mm[:ss]]]]]
Ü --datestopYYYY[-MM[-DD[Thh[:mm[:ss]]]]]
î Only match during the given time, Thepossible time range is 1970-01-01 T00:00:00 to 2038-01-19 T04:17:07
Ü --timestart hh:mm[:ss]
Ü --timestop hh:mm[:ss]
î The possible time range is00:00:00 to 23:59:59.
î Leading zeroes are allowed.
v time
Ü [!] --monthdays day[,day...]
î Only match on the given days of the month. Possible values are1 to 31.
Ü [!] --weekdays day[,day...]
î Only match on the givenweekdays. Possible values are Mon, Tue, Wed, Thu, Fri, Sat, Sun, or values from1 to 7, respectively.
Ü Examples:
î -m time --weekdays Sa,Su
î -m time --timestart 12:30--timestop 13:30
[root@station93~]# iptables -A FORWARD -m time --timestart 00:00 --timestop 8:00 -j DROP
v -j LOG
Ü --log-level level
î Level of logging
Ü --log-prefix prefix
î Prefix log messages with thespecified prefix; up to 29 letters long, and useful for distinguishing messagesin the logs.
Ü --log-tcp-options
î Log options from the TCP packetheader.
Ü --log-ip-options
î Log options from the IP packetheader.
[root@station93~]# iptables -A FORWARD -s 10.0.3.100 –d 10.0.2.100 –p tcp –dport -j LOG --log-prefix "abc"
基于l7layer的规则则十分类似,在其内部已经为我们定义好,我们只需要调用其就行了。
例如:禁止内网用户在上班时间使用qq
[root@station93 ~]# iptables -A FORWARD -s 10.0.2.100 -d10.0.3.100 -p tcp --dport 80 -m time --timestart 8:00 --timestop 18:00 -m layer7 --l7proto qq -j DROP
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