超級實用的 iptables 防火牆指令碼
| 本文件詳細介紹生產環境中超級實用的iptables 。 |
建立 iptables.sh
[root@Jaking ~]# vim iptables.sh #!/bin/bash #清空 filter 表和 nat 表 iptables -F iptables -t nat -F #關掉 firewalld systemctl stop firewalld &>/dev/null systemctl disable firewalld &>/dev/null #以下兩行允許某些呼叫 localhost 的應用訪問 iptables -A INPUT -i lo -j ACCEPT #規則1 iptables -A INPUT -s 127.0.0.1 -d 127.0.0.1 -j ACCEPT #規則2 #以下一行允許從其他地方 ping iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT #規則3 #以下一行允許從其他主機、網路裝置傳送 MTU 調整的報文 #在一些情況下，例如透過 IPSec VPN 隧道時，主機的 MTU 需要動態減小 iptables -A INPUT -p icmp --icmp-type fragmentation-needed -j ACCEPT #規則4 #以下兩行分別允許所有來源訪問 TCP 80,443 埠 iptables -A INPUT -p tcp --dport 80 -j ACCEPT #規則5 iptables -A INPUT -p tcp --dport 443 -j ACCEPT #規則6 #以下一行允許所有來源訪問 UDP 80,443 埠 iptables -A INPUT -p udp -m multiport --dports 80,443 -j ACCEPT #規則7 #以下一行允許 192.168.1.63 來源的 IP 訪問 TCP 22 埠(OpenSSH) iptables -A INPUT -p tcp -s 192.168.1.63 --dport 22 -j ACCEPT #規則8 #以下一行允許 192.168.1.3(發起SSH連線的系統對應網路卡的IP) 來源的 IP 訪問 TCP 22 埠(OpenSSH) #如果是在遠端終端跑本指令碼，最好開啟以下一行以防被踢掉 #另一種更加簡便的方式：iptables -I INPUT -p tcp --dport 22 -j ACCEPT iptables -A INPUT -p tcp -s 192.168.1.3 --dport 22 -j ACCEPT #規則9 #以下一行允許 192.168.1.26 來源的 IP 訪問 UDP 161 埠(SNMP) iptables -A INPUT -p udp -s 192.168.1.26 --dport 161 -j ACCEPT #規則10 #配置 NAT #啟用核心路由轉發功能 echo 1 > /proc/sys/net/ipv4/ip_forward echo "net.ipv4.ip_forward = 1" > /etc/sysctl.conf sysctl -p &>/dev/null #配置源地址轉換 SNAT #將 192.168.2.0/24 轉換成 192.168.1.63 iptables -t nat -A POSTROUTING -s 192.168.2.0/24 -j SNAT --to 192.168.1.63 #規則11 #配置目的地址轉換 DNAT #將 192.168.1.63 的 80 埠請求轉發到 192.168.2.2 的 80 埠 iptables -t nat -A PREROUTING -d 192.168.1.63 -p tcp --dport 80 -j DNAT --to 192.168.2.2:80 #規則12 #以下一行禁止所有其他的進入流量 iptables -A INPUT -j DROP #規則13 #以下一行允許本機響應規則編號為 1-12 的資料包發出 iptables -A OUTPUT -m state --state ESTABLISHED -j ACCEPT #規則14 #以下一行禁止本機主動發出外部連線 iptables -A OUTPUT -j DROP #規則15 #以下一行禁止本機轉發資料包 iptables -A FORWARD -j DROP #規則16 #固化 iptables iptables-save > /etc/sysconfig/iptables [root@Jaking ~]# chmod 755 iptables.sh
測試
[root@Jaking ~]# ./iptables.sh [root@Jaking ~]# [root@Jaking ~]# [root@Jaking ~]# iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere anywhere ACCEPT all -- localhost localhost ACCEPT icmp -- anywhere anywhere icmp echo-request ACCEPT icmp -- anywhere anywhere icmp fragmentation-needed ACCEPT tcp -- anywhere anywhere tcp dpt:http ACCEPT tcp -- anywhere anywhere tcp dpt:https ACCEPT udp -- anywhere anywhere multiport dports http,https ACCEPT tcp -- 192.168.1.63 anywhere tcp dpt:ssh ACCEPT tcp -- 192.168.1.3 anywhere tcp dpt:ssh ACCEPT udp -- 192.168.1.26 anywhere udp dpt:snmp DROP all -- anywhere anywhere Chain FORWARD (policy ACCEPT) target prot opt source destination DROP all -- anywhere anywhere Chain OUTPUT (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere anywhere state ESTABLISHED DROP all -- anywhere anywhere [root@Jaking ~]# iptables -L --line-number Chain INPUT (policy ACCEPT) num target prot opt source destination 1 ACCEPT all -- anywhere anywhere 2 ACCEPT all -- localhost localhost 3 ACCEPT icmp -- anywhere anywhere icmp echo-request 4 ACCEPT icmp -- anywhere anywhere icmp fragmentation-needed 5 ACCEPT tcp -- anywhere anywhere tcp dpt:http 6 ACCEPT tcp -- anywhere anywhere tcp dpt:https 7 ACCEPT udp -- anywhere anywhere multiport dports http,https 8 ACCEPT tcp -- 192.168.1.63 anywhere tcp dpt:ssh 9 ACCEPT tcp -- 192.168.1.3 anywhere tcp dpt:ssh 10 ACCEPT udp -- 192.168.1.26 anywhere udp dpt:snmp 11 DROP all -- anywhere anywhere Chain FORWARD (policy ACCEPT) num target prot opt source destination 1 DROP all -- anywhere anywhere Chain OUTPUT (policy ACCEPT) num target prot opt source destination 1 ACCEPT all -- anywhere anywhere state ESTABLISHED 2 DROP all -- anywhere anywhere [root@Jaking ~]# iptables -t nat -L Chain PREROUTING (policy ACCEPT) target prot opt source destination DNAT tcp -- anywhere 192.168.1.63 tcp dpt:http to:192.168.2.2:80 Chain INPUT (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination Chain POSTROUTING (policy ACCEPT) target prot opt source destination SNAT all -- 192.168.2.0/24 anywhere to:192.168.1.63 [root@Jaking ~]# iptables -t nat -L --line-number Chain PREROUTING (policy ACCEPT) num target prot opt source destination 1 DNAT tcp -- anywhere 192.168.1.63 tcp dpt:http to:192.168.2.2:80 Chain INPUT (policy ACCEPT) num target prot opt source destination Chain OUTPUT (policy ACCEPT) num target prot opt source destination Chain POSTROUTING (policy ACCEPT) num target prot opt source destination 1 SNAT all -- 192.168.2.0/24 anywhere to:192.168.1.63
iptables 的清空和恢復
[root@Jaking ~]# iptables -F [root@Jaking ~]# iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination [root@Jaking ~]# iptables -t nat -F [root@Jaking ~]# iptables -t nat -L Chain PREROUTING (policy ACCEPT) target prot opt source destination Chain INPUT (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination Chain POSTROUTING (policy ACCEPT) target prot opt source destination [root@Jaking ~]# iptables-restore < /etc/sysconfig/iptables [root@Jaking ~]# iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere anywhere ACCEPT all -- localhost localhost ACCEPT icmp -- anywhere anywhere icmp echo-request ACCEPT icmp -- anywhere anywhere icmp fragmentation-needed ACCEPT tcp -- anywhere anywhere tcp dpt:http ACCEPT tcp -- anywhere anywhere tcp dpt:https ACCEPT udp -- anywhere anywhere multiport dports http,https ACCEPT tcp -- 192.168.1.63 anywhere tcp dpt:ssh ACCEPT tcp -- 192.168.1.3 anywhere tcp dpt:ssh ACCEPT udp -- 192.168.1.26 anywhere udp dpt:snmp DROP all -- anywhere anywhere Chain FORWARD (policy ACCEPT) target prot opt source destination DROP all -- anywhere anywhere Chain OUTPUT (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere anywhere state ESTABLISHED DROP all -- anywhere anywhere [root@Jaking ~]# iptables -t nat -L Chain PREROUTING (policy ACCEPT) target prot opt source destination DNAT tcp -- anywhere 192.168.1.63 tcp dpt:http to:192.168.2.2:80 Chain INPUT (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination Chain POSTROUTING (policy ACCEPT) target prot opt source destination SNAT all -- 192.168.2.0/24 anywhere to:192.168.1.63
總結
以上就是生產環境中超級實用的iptables指令碼，這個指令碼可以直接拿去用，不過請謹慎操作！
本文原創地址： 編輯：傳棋，稽核員：逄增寶
來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/31524109/viewspace-2688923/，如需轉載，請註明出處，否則將追究法律責任。
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