用Iptables与Squid实现透明代理

liusimin

一、 /etc/sysconfig/iptables 文件 # /etc/sysconfig/iptables 文件 # #======================= 古公 ======================= # # mangle 段 *mangle :PREROUTING ACCEPT [0:0] :OUTPUT ACCEPT [0:0] COMMIT # # # nat 段 *nat :PREROUTING ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] :OUTPUT ACCEPT [0:0] # # 为使用 SQUID 作“透明代理”而设定！ # # 没有指定 网卡、地址： #[0:0] -A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128 # # 指定 网卡、地址： [0:0] -A PREROUTING -s 192.168.20.0/255.255.255.0 -i eth0 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128 [0:0] -A PREROUTING -s 192.168.20.0/255.255.255.0 -i eth0 -p tcp -m tcp --dport 443 -j REDIRECT --to-ports 3128 # 将 对于 80、443 端口的访问 重定向到 3128 端口。 # # # 这些机器可以走这个机器做网关上 Internet 网。 # 需要在 /etc/sysctl.conf 文件里面修改成 net.ipv4.ip_forward = 1 # 或者 echo 1 > /proc/sys/net/ipv4/ip_forward # 由于利用 SQUID 实现了“透明代理”，Masq 取消相应的客户地址。 # 这里，只剩下几个需要利用“IP伪装”来上网的机器（可以上 QQ、雅虎通、msn 之类的）： # [0:0] -A POSTROUTING -s 192.168.20.3 -j MASQUERADE [0:0] -A POSTROUTING -s 192.168.20.10 -j MASQUERADE [0:0] -A POSTROUTING -s 192.168.20.32/255.255.255.240 -j MASQUERADE # 若你的 公网的 IP 地址是固定的，使用这个语句似乎更好些： #[0:0] -A POSTROUTING -s 192.168.20.32/255.255.255.240 -j SNAT --to 211.148.130.133 COMMIT # # # filter 段 *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] # # 屏蔽 来自 microsoft 的站点: [0:0] -A INPUT -s 207.46.0.0/255.255.0.0 -j DROP [0:0] -A INPUT -d 207.46.0.0/255.255.0.0 -j DROP # # 防止IP欺骗： # 所谓的IP欺骗就是指在IP包中存在着不可能的IP源地址或目标地址。 # eth1是一个与外部Internet相连，而192.168.20.0则是内部网的网络号， # 也就是说，如果有一个包从eth1进入主机，而说自己的源地址是属于 # 192.168.20.0网络，或者说它的目标地址是属于这个网络的，那么这显 # 然是一种IP欺骗，所以我们使用DROP将这个包丢弃。 [0:0] -A INPUT -d 192.168.20.0/255.255.255.0 -i eth1 -j DROP [0:0] -A INPUT -s 192.168.20.0/255.255.255.0 -i eth1 -j DROP # # 同样的，如果有包要通过eth1向Internet，而且它的源地址或目标地址是属于 # 网络192.168.20.0，那么显然也是不可能的。我们仍然使用DROP将它丢弃。 [0:0] -A OUTPUT -d 192.168.20.0/255.255.255.0 -o eth1 -j DROP [0:0] -A OUTPUT -s 192.168.20.0/255.255.255.0 -o eth1 -j DROP # # 防止广播包从IP代理服务器进入局域网： [0:0] -A INPUT -s 255.255.255.255 -i eth0 -j DROP [0:0] -A INPUT -s 224.0.0.0/224.0.0.0 -i eth0 -j DROP [0:0] -A INPUT -d 0.0.0.0 -i eth0 -j DROP # 当包的源地址是255.255.255.255或目标地址是0.0.0.0，则说明它是一个 # 广播包，当广播包想进入eth0时，我们就应该DENY，丢弃它。而240.0.0.0/3 # 则是国际标准的多目广播地址，当有一个源地址是属于多目广播地址的包， # 我们将用DROP策略，丢弃它。 # # 屏蔽 windows xp 的 5000 端口（这个端口是莫名其妙的 ！） [0:0] -A INPUT -p tcp -m tcp --sport 5000 -j DROP [0:0] -A INPUT -p udp -m udp --sport 5000 -j DROP [0:0] -A OUTPUT -p tcp -m tcp --dport 5000 -j DROP [0:0] -A OUTPUT -p udp -m udp --dport 5000 -j DROP # 原来是用来跑 vpn 的，呵呵，我误解了。 # # # 防止 Internet 网的用户访问 SAMBA 服务器： [0:0] -A INPUT -s 211.148.130.129 -i eth1 -p tcp -m tcp --dport 137:139 -j DROP [0:0] -A INPUT -s 211.148.130.129 -i eth1 -p udp -m udp --dport 137:139 -j DROP [0:0] -A INPUT -s 192.168.20.0/255.255.255.0 -i eth0 -p tcp -m tcp --dport 137:139 -j ACCEPT [0:0] -A INPUT -s 192.168.20.0/255.255.255.0 -i eth0 -p udp -m udp --dport 137:139 -j ACCEPT [0:0] -A INPUT -s 211.148.130.128/255.255.255.240 -i eth1 -p tcp -m tcp --dport 137:139 -j ACCEPT [0:0] -A INPUT -s 211.148.130.128/255.255.255.240 -i eth1 -p udp -m udp --dport 137:139 -j ACCEPT [0:0] -A INPUT -p tcp -m tcp --dport 137:139 -j DROP [0:0] -A INPUT -p udp -m udp --dport 137:139 -j DROP # # # 对于本局域网用户不拒绝访问： [0:0] -A INPUT -s 192.168.20.0/255.255.255.0 -i eth0 -p tcp -j ACCEPT [0:0] -A INPUT -s 192.168.20.0/255.255.255.0 -i eth0 -p udp -j ACCEPT # # [0:0] -A INPUT -i eth1 -p udp -m udp --dport 3 -j DROP [0:0] -A INPUT -i eth1 -p tcp -m tcp --dport 3 -j DROP [0:0] -A INPUT -i eth1 -p tcp -m tcp --dport 111 -j DROP [0:0] -A INPUT -i eth1 -p udp -m udp --dport 111 -j DROP # # [0:0] -A INPUT -i eth1 -p udp -m udp --dport 587 -j DROP [0:0] -A INPUT -i eth1 -p tcp -m tcp --dport 587 -j DROP # # 防止 Internet 用户访问 SQUID 的 3128 端口： [0:0] -A INPUT -s 211.148.130.129 -i eth1 -p tcp -m tcp --dport 3128 -j DROP [0:0] -A INPUT -s 192.168.20.0/255.255.255.0 -i eth0 -p tcp -m tcp --dport 3128 -j ACCEPT [0:0] -A INPUT -s 211.148.130.128/255.255.255.240 -i eth1 -p tcp -m tcp --dport 3128 -j ACCEPT [0:0] -A INPUT -p tcp -m tcp --dport 3128 -j DROP # # 让人家 ping 不通我 ！ [0:0] -A INPUT -i eth1 -s 192.168.30.0/24 -p icmp -m icmp --icmp-type 8 -j ACCEPT [0:0] -A INPUT -i eth1 -s 211.148.130.128/28 -p icmp -m icmp --icmp-type 8 -j ACCEPT [0:0] -A INPUT -i eth1 -p icmp -m icmp --icmp-type 8 -j DROP # COMMIT # ======================= 结束 ======================= # ======================= 古公 ======================= 二、再看看 /etc/squid/squid.conf 文件 # /etc/squid/squid.conf 文件 # # http_port 3128 http_port 192.168.20.8:3128 hierarchy_stoplist cgi-bin ? acl QUERY urlpath_regex cgi-bin \? no_cache deny QUERY # cache_mem 8 MB cache_mem 48 MB # emulate_httpd_log off # ============================================================================ emulate_httpd_log on # ============================================================================ # redirect_rewrites_host_header on # ============================================================================ redirect_rewrites_host_header off # ============================================================================ #Recommended minimum configuration: acl all src 0.0.0.0/0.0.0.0 acl manager proto cache_object acl localhost src 127.0.0.1/255.255.255.255 acl SSL_ports port 443 563 acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 563 # https, snews acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port 280 # http-mgmt acl Safe_ports port 488 # gss-http acl Safe_ports port 591 # filemaker acl Safe_ports port 777 # multiling http acl CONNECT method CONNECT # ============================================================================ # acl allow_domain dstdomain "/etc/squid/allow_domain" # 下面是只允许每天上三个小时的： acl no_allow_time_0_1 time "/etc/squid/no_allow_time_0_1" acl no_allow_time_0_2 time "/etc/squid/no_allow_time_0_2" acl no_allow_time_0_3 time "/etc/squid/no_allow_time_0_3" acl no_allow_time_0_4 time "/etc/squid/no_allow_time_0_4" acl no_allow_time_0_5 time "/etc/squid/no_allow_time_0_5" # 完 # 下面是只允许每天上八个小时的： acl no_allow_time_1_1 time "/etc/squid/no_allow_time_1_1" acl no_allow_time_1_2 time "/etc/squid/no_allow_time_1_2" acl no_allow_time_1_3 time "/etc/squid/no_allow_time_1_3" acl no_allow_time_1_4 time "/etc/squid/no_allow_time_1_4" acl no_allow_time_1_5 time "/etc/squid/no_allow_time_1_5" # 完 acl no_allow_web dst "/etc/squid/no_allow_web" acl no_allow_domain dstdomain "/etc/squid/no_allow_domain" acl no_allow_client src "/etc/squid/no_allow_client" #acl allow_time time "/etc/squid/allow_time" # acl allow_client_inf src "/etc/squid/allow_client_inf" acl allow_client_fore src "/etc/squid/allow_client_fore" acl allow_client_8h src "/etc/squid/allow_client_8h" acl allow_client_3h src "/etc/squid/allow_client_3h" # # # acl Uncachable url_regex cgi \? # # Only allow cachemgr access from localhost http_access allow manager localhost http_access deny manager # ============================================================================ # Deny requests to unknown ports http_access deny !Safe_ports # ============================================================================ no_cache deny Uncachable http_access allow allow_domain http_access allow allow_client_inf http_access deny no_allow_web http_access deny no_allow_domain http_access deny no_allow_client http_access allow allow_client_fore # # 下面是只允许每天上八个小时的： http_access deny no_allow_time_1_1 allow_client_8h http_access deny no_allow_time_1_2 allow_client_8h http_access deny no_allow_time_1_3 allow_client_8h http_access deny no_allow_time_1_4 allow_client_8h http_access deny no_allow_time_1_5 allow_client_8h http_access allow allow_client_8h # 完 # # 下面是只允许每天上三个小时的： http_access deny no_allow_time_0_1 allow_client_3h http_access deny no_allow_time_0_2 allow_client_3h http_access deny no_allow_time_0_3 allow_client_3h http_access deny no_allow_time_0_4 allow_client_3h http_access deny no_allow_time_0_5 allow_client_3h http_access allow allow_client_3h # 完 #http_access deny no_allow_time # ============================================================================ # Deny CONNECT to other than SSL ports http_access deny CONNECT !SSL_ports # INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS # # And finally deny all other access to this proxy http_access allow localhost http_access deny all #Allow ICP queries from eveyone icp_access allow all cache_mgr webmaster@fruitron.com.cn # httpd_accel_port 80 # +++++++++++++++++++++++++++++++++++ 古公 ++++++++++++透明代理的设定+++++++++ httpd_accel_host virtual #httpd_accel_port 80 # +++++++++++++++++++++++++++++++++++ 古公 ++++++++++++透明代理的设定+++++++++ # httpd_accel_with_proxy on # +++++++++++++++++++++++++++++++++++ 古公 ++++++++++++透明代理的设定+++++++++ httpd_accel_with_proxy off # +++++++++++++++++++++++++++++++++++ 古公 ++++++++++++透明代理的设定+++++++++ # httpd_accel_uses_host_header off # +++++++++++++++++++++++++++++++++++ 古公 ++++++++++++透明代理的设定+++++++++ httpd_accel_uses_host_header on # +++++++++++++++++++++++++++++++++++ 古公 ++++++++++++透明代理的设定+++++++++ append_domain .fruitron.com.cn # ============================================================================ error_directory /usr/lib/squid/errors/Simplify_Chinese # ============================================================================ # ============================================================================ delay_pools 1 # 1 delay pools delay_class 1 3 # pool 1 is a class 3 pool # ============================================================================ #delay_access 1 deny all delay_access 1 allow allow_client_3h allow_client_8h allow_client_fore allow_client_inf delay_access 1 deny all # ============================================================================ # ============================================================================ delay_parameters 1 8000/8000 2000/4000 4000/8000 #delay_parameters 2 8000/8000 4000/8000 4000/8000 #delay_parameters 3 8000/8000 4000/8000 4000/8000 # ============================================================================ # ie_refresh off # ============================================================================ #ie_refresh on

liusimin

参照一下 ifconfig 的输出，可能效果更好一些： 2002年11月18B4下午13时41分28秒[root@squid gugong]# ifconfig eth0 Link encap:Ethernet HWaddr 00:50:FE:B7:7A:8D inet addr:192.168.20.8 Bcast:192.168.20.255 Mask:255.255.255.0 UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:11020015 errors:0 dropped:0 overruns:0 frame:0 TX packets:11436178 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 RX bytes:2195933623 (2094.2 Mb) TX bytes:3942280622 (3759.6 Mb) Interrupt:10 Base address:0xd000 eth0:0 Link encap:Ethernet HWaddr 00:50:FE:B7:7A:8D inet addr:192.168.10.8 Bcast:192.168.20.255 Mask:255.255.255.0 UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 Interrupt:10 Base address:0xd000 eth1 Link encap:Ethernet HWaddr 00:05:5D:0D:BE:8A inet addr:211.148.130.133 Bcast:211.148.130.135 Mask:255.255.255.248 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1710331 errors:0 dropped:0 overruns:0 frame:0 TX packets:1135502 errors:3 dropped:0 overruns:0 carrier:0 collisions:21006 txqueuelen:100 RX bytes:1075231971 (1025.4 Mb) TX bytes:153524789 (146.4 Mb) Interrupt:11 Base address:0xb800 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:7094 errors:0 dropped:0 overruns:0 frame:0 TX packets:7094 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:835017 (815.4 Kb) TX bytes:835017 (815.4 Kb)

gzhr

squid做反向/透明代理的问题在于https/ssl无法处理，至少2.x版本是不行了，3.0似乎有所加强，但目前没有稳定版

zhangweizj

这个是linuxfans的古公写的 ?

cxkdl11

是不是用一个就可以上网了？

fuleru

QUOTE (zhangweizj @ Jan 22 2005, 03:42 PM)
这个是linuxfans的古公写的 ?  
  这个别人写的脚本，楼主还是要注明转载的好，

fuleru

呵呵，另外，这是RH的写法，一般我看iptables 的写法还是一条条写的好，不太习惯RH的这种风格，还有iptables-save保存的结果。