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Incoming
Traffic
|
|
V
+----------+
|PREROUTING|
+----------+
| raw | <--------------+
| mangle | |
| nat | |
+----------+ |
| |
| |
Routing |
+- Decision -+ |
| | |
| | |
V V |
Local Remote |
Destination Destination |
| | |
| | |
V V |
+--------+ +---------+ |
| INPUT | | FORWARD | |
+--------+ +---------+ |
| mangle | | mangle | |
| filter | | filter | |
+--------+ +---------+ |
| | |
| | |
V | |
Local | |
Machine | |
| | |
| | |
V | |
Routing | |
Decision | |
| | |
| | |
V | |
+--------+ | |
| OUTPUT | | |
+--------+ | |
| raw | | |
| mangle | | |
| nat | | |
| filter | | |
+--------+ | |
| | |
| +-------------+ |
| | POSTROUTING | Local
+----> +-------------+ --> Traffic
| mangle |
| nat |
+-------------+
|
|
V
Outgoing
Traffic
Redhat / CentOS
You can check to see if iptables is installed on your system by:
[root@database ~]# rpm -q iptables iptables-1.3.5-5.3.el5_4.1
And to see if iptables is actually running, we can check that the iptables modules are loaded and use the -L switch to inspect the currently loaded rules:
[root@database ~]# lsmod | grep ip_tables ip_tables 55201 2 iptable_nat,iptable_filter x_tables 50505 6 ipt_MASQUERADE,iptable_nat,xt_state,ipt_REJECT,xt_tcpudp,ip_tables
[root@database ~]# iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT udp -- anywhere anywhere udp dpt:domain ACCEPT tcp -- anywhere anywhere tcp dpt:domain ACCEPT udp -- anywhere anywhere udp dpt:bootps ACCEPT tcp -- anywhere anywhere tcp dpt:bootps Chain FORWARD (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere 192.168.122.0/24 state RELATED,ESTABLISHED ACCEPT all -- 192.168.122.0/24 anywhere ACCEPT all -- anywhere anywhere REJECT all -- anywhere anywhere reject-with icmp-port-unreachable REJECT all -- anywhere anywhere reject-with icmp-port-unreachable Chain OUTPUT (policy ACCEPT) target prot opt source destination
If iptables is not running, you can enable it by running:
# lokkit --enabled --selinux=disabled # lokkit --disabled --selinux=disabled
# lokkit --enabled # ls /etc/sysconfig/iptables* iptables iptables-config iptables.old # cat /etc/sysconfig/iptables # Firewall configuration written by system-config-firewall # Manual customization of this file is not recommended. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT # lokkit --disabled # ls /etc/sysconfig/iptables* iptables-config iptables.old
lokkit --enabled作用就是產生/etc/sysconfig/iptables檔案。--disabled的作用是將更名為iptables.old
# system-config-securitylevel
iptables -A INPUT -i lo -j ACCEPT iptables -A INPUT -i eth0 -j ACCEPT iptables -A INPUT -i ppp0 -j ACCEPT
# Accept packets from trusted IP addresses iptables -A INPUT -s 192.168.0.4 -j ACCEPT # change the IP address as appropriate # Accept packets from trusted IP addresses iptables -A INPUT -s 192.168.0.0/24 -j ACCEPT # using standard slash notation iptables -A INPUT -s 192.168.0.0/255.255.255.0 -j ACCEPT # using a subnet mask # Accept packets from trusted IP addresses iptables -A INPUT -s 192.168.0.4 -m mac --mac-source 00:50:8D:FD:E6:32 -j ACCEPT
# Accept tcp packets on destination port 6881 (bittorrent) iptables -A INPUT -p tcp --dport 6881 -j ACCEPT # Accept tcp packets on destination ports 6881-6890 iptables -A INPUT -p tcp --dport 6881:6890 -j ACCEPT
NEW — A packet requesting a new connection, such as an HTTP request.
ESTABLISHED — A packet that is part of an existing connection.
RELATED — A packet that is requesting a new connection but is part of an existing connection. For example, FTP uses port 21 to establish a connection, but data is transferred on a different port (typically port 20).
INVALID — A packet that is not part of any connections in the connection tracking table.
iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
列出規則鏈
列出INPUT,OUTPUT,FORWARD規則 iptables -L 列出NAT規則 iptables -t nat -L 列出過濾規則 iptables -t filter -L
刷新規則
/sbin/iptables -F /sbin/iptables -F -t filter /sbin/iptables -F -t nat /sbin/iptables -t nat -P PREROUTING ACCEPT /sbin/iptables -t nat -P POSTROUTING ACCEPT /sbin/iptables -P INPUT ACCEPT /sbin/iptables -P OUTPUT ACCEPT /sbin/iptables -P FORWARD ACCEPT
# Accept tcp packets on destination port 22 (SSH) iptables -A INPUT -p tcp --dport 22 -j ACCEPT # Accept tcp packets on destination port 22 (SSH) from private LAN iptables -A INPUT -p tcp -s 192.168.0.0/24 --dport 22 -j ACCEPT
/sbin/iptables -A INPUT -p tcp --dport 21 -j ACCEPT /sbin/iptables -A INPUT -p tcp --dport 20 -j ACCEPT
iptables -A INPUT -i eth0 -p tcp --dport 53 -j ACCEPT iptables -A INPUT -i eth0 -p udp --dport 53 -j ACCEPT
# WWW /sbin/iptables -A INPUT -p tcp --dport 80 -j ACCEPT # HTTPS /sbin/iptables -A INPUT -p tcp --dport 443 -j ACCEPT # Tomcat /sbin/iptables -A INPUT -p tcp --dport 8080 -j ACCEPT
# SMTP /sbin/iptables -A INPUT -p tcp --dport 25 -j ACCEPT # SMTPS /sbin/iptables -A INPUT -p tcp --dport 465 -j ACCEPT # POP3 /sbin/iptables -A INPUT -p tcp --dport 110 -j ACCEPT # POP3S /sbin/iptables -A INPUT -p tcp --dport 995 -j ACCEPT # IMAP /sbin/iptables -A INPUT -p tcp --dport 143 -j ACCEPT # IMAPS /sbin/iptables -A INPUT -p tcp --dport 993 -j ACCEPT
iptables -A INPUT -p UDP -i eth0 --dport 67 -j ACCEPT iptables -A INPUT -p UDP -i eth0 --dport 68 -j ACCEPT
/sbin/iptables -A INPUT -p tcp -s 192.168.0.0/24 --dport 137 -j ACCEPT iptables -A INPUT -p tcp -s 192.168.0.0/24 --dport 145 -j ACCEPT iptables -A INPUT -p udp -s 192.168.0.0/24 --dport 138 -j ACCEPT iptables -A INPUT -p udp -s 192.168.0.0/24 --dport 139 -j ACCEPT
accept_redirects
# echo "0" > /proc/sys/net/ipv4/conf/all/accept_redirects
or
# sysctl net.ipv4.conf.all.accept_redirects="0"
使自己不能ping 通 127.0.0.1 iptables -A INPUT -s 127.0.0.1 -p icmp -j DROP 192.168.0.0/24 網段無法ping能本機 iptables -A INPUT -s 192.168.0.0/24 -p icmp -j DROP 禁所有機器 # iptables -A INPUT -s 0/0 -p icmp -j DROP # ICMP(PING) 接受 ! echo-request iptables -A INPUT -p icmp --icmp-type ! echo-request -j ACCEPT
# Open ports for outbound established connections $IPT -A OUTPUT -p tcp -s $NET -d 0/0 --destination-port 1:65535 -j ACCEPT $IPT -A OUTPUT -p udp -s $NET -d 0/0 --destination-port 1:65535 -j ACCEPT
本地不允許ping 192.168.0.0/24
iptables -A OUTPUT -s 192.168.0.0/24 -p icmp -j DROP
禁所本地ping任何機器
# iptables -A OUTPUT -s 0/0 -p icmp -j DROP
# ICMP(PING) 接受 ! echo-request
iptables -A OUTPUT -p icmp --icmp-type ! echo-request -j ACCEPT
iptables -A FORWARD -i eth1 -j ACCEPT
# Network 1 forwarded outgoing client request to network 2 iptables -A FORWARD -i eth1 -p tcp -s 192.168.1.0/24 -d 192.168.2.0/24 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A FORWARD -o eth1 -p tcp -s 192.168.2.0/24 -d 192.168.1.0/24 -m state --state ESTABLISHED,RELATED -j ACCEPT
重定向規則
連接埠重定向 # iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 21 -j REDIRECT --to-port 2401 將80連接埠重定向到8080 # iptables -t nat -A PREROUTING -j REDIRECT -p tcp --destination-port 80 --to-ports 8080
連接埠轉發
echo 1 > /proc/sys/net/ipv4/ip_forward iptables -t nat -A PREROUTING -d 192.168.3.9 -p tcp -m tcp --dport 1000 -j DNAT --to-destination 192.168.3.137:8080 iptables -t nat -A POSTROUTING -s 192.168.3.0/255.255.255.0 -d 192.168.3.137 -p tcp -m tcp --dport 8080 -j SNAT --to-source 192.168.3.9
iptables -P FORWARD ACCEPT iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -j MASQUERADE iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -o eth0 -j MASQUERADE sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE sudo iptables -t nat -I POSTROUTING -j MASQUERADE sudo iptables -t nat -A POSTROUTING -j MASQUERADE -s 172.16.0.0/24 -d 0.0.0.0/0 sudo iptables -t nat -A POSTROUTING -j MASQUERADE -o eth1 -s 172.16.1.0/24 -d 0.0.0.0/0 sudo iptables -t nat -A POSTROUTING -j MASQUERADE -p tcp -o eth1 -s 172.16.1.0/24 -d 0.0.0.0/0
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT --to 172.31.0.23:80
If you have a default policy of DROP in your FORWARD chain, you must append a rule to forward all incoming HTTP requests so that destination NAT routing is possible. To do this, use the following command:
iptables -A FORWARD -i eth0 -p tcp --dport 80 -d 172.31.0.23 -j ACCEPT
This rule forwards all incoming HTTP requests from the firewall to the intended destination; the Apache HTTP Server behind the firewall.
echo 1 > /proc/sys/net/ipv4/ip_forward iptables -t nat -A PREROUTING -d 202.103.96.10 -j DNAT --to-destination 192.168.0.10 iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -j SNAT --to-source 202.96.244.56
# # DMZ zone # $iptables -t nat -A PREROUTING -p TCP -m multiport -i eth0 --dport 22,25,113,80,8080 -j DNAT --to 10.0.0.10 $iptables -t nat -A PREROUTING -p UDP -i eth0 --dport 25 -j DNAT --to-destination 10.0.0.10
DNAT ppp0/eth0
iptables -t nat -A PREROUTING -p tcp -i ppp0 --dport 80 -j DNAT --to-destination <web server ip> iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT --to-destination 10.0.4.2:80
iptables -m string -h
# iptables -A INPUT -p tcp --dport 80 -m string --algo bm --string "XXDD0S" -j DROP
限制多少IP連結你的伺服器
# allow 2 telnet connections per client host
iptables -p tcp --syn --dport 23 -m connlimit --connlimit-above 2 -j REJECT
# you can also match the other way around:
iptables -p tcp --syn --dport 23 -m connlimit ! --connlimit-above 2 -j ACCEPT
# limit the nr of parallel http requests to 16 per class C sized
# network (24 bit netmask)
iptables -p tcp --syn --dport 80 -m connlimit --connlimit-above 16 \
--connlimit-mask 24 -j REJECT
# Skip proxy server IP 1.2.3.4 from this kind of limitations:
iptables -A INPUT -p tcp --syn --dport 80 -d ! 1.2.3.4 -m connlimit --connlimit-above 20 -j REJECT --reject-with tcp-reset
iptables -A INPUT -i ppp0 -p tcp --syn -m connlimit --connlimit-above 15 -j DROP
iptables -A INPUT -s 192.186.0.0/24 -p tcp --syn -m connlimit --connlimit-above 15 -j DROP
iptables -I INPUT -p tcp --dport 80 -m connlimit --connlimit-above 50 -j REJECT
iptables -A INPUT -p tcp -m state --state NEW -m tcp --dport 443 --syn -m connlimit --connlimit-above 50 -j REJECT
例 45.1. connlimit 實例
OS: CentOS
# Generated by iptables-save v1.3.5 on Thu Mar 1 19:01:23 2012 *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [548:1014604] :RH-Firewall-1-INPUT - [0:0] -A INPUT -j RH-Firewall-1-INPUT -A FORWARD -j RH-Firewall-1-INPUT -A OUTPUT -p udp -m udp --dport 53 -j ACCEPT -A OUTPUT -p udp -m udp --dport 161 -j ACCEPT -A OUTPUT -p udp -j DROP -A RH-Firewall-1-INPUT -i lo -j ACCEPT -A RH-Firewall-1-INPUT -p icmp -m icmp --icmp-type any -j ACCEPT -A RH-Firewall-1-INPUT -p esp -j ACCEPT -A RH-Firewall-1-INPUT -p ah -j ACCEPT -A RH-Firewall-1-INPUT -d 224.0.0.251 -p udp -m udp --dport 5353 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 3306 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 80 --tcp-flags FIN,SYN,RST,ACK SYN -m connlimit --connlimit-above 50 --connlimit-mask 32 -j REJECT --reject-with icmp-port-unreachable -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 443 --tcp-flags FIN,SYN,RST,ACK SYN -m connlimit --connlimit-above 50 --connlimit-mask 32 -j REJECT --reject-with icmp-port-unreachable -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 443 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited COMMIT # Completed on Thu Mar 1 19:01:23 2012
CentOS
# Firewall configuration written by system-config-firewall # Manual customization of this file is not recommended. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -A INPUT -p tcp -m state --state NEW -m tcp --dport 443 --tcp-flags FIN,SYN,RST,ACK SYN -m connlimit --connlimit-above 50 --connlimit-mask 32 -j REJECT --reject-with icmp-port-unreachable -A INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT
[root@linux iptables]# modprobe ipv6 [root@linux iptables]# modprobe ip6_tables [root@linux iptables]# [ ! -f /proc/net/ip6_tables_names ] && echo "Current kernel doesn't support? 'ip6tables' firewalling (IPv6)!" [root@linux iptables]# ip6tables -A INPUT -i eth0 -p tcp -s 3ffe:ffff:100::1/128 --dport 22 -j ACCEPT
例 45.2.
/sbin/iptables -F /sbin/iptables -F -t filter /sbin/iptables -F -t nat /sbin/iptables -t nat -P PREROUTING ACCEPT /sbin/iptables -t nat -P POSTROUTING ACCEPT /sbin/iptables -t nat -P OUTPUT ACCEPT /sbin/iptables -P INPUT ACCEPT /sbin/iptables -P OUTPUT ACCEPT /sbin/iptables -P FORWARD ACCEPT -P INPUT ACCEPT -P FORWARD ACCEPT -P OUTPUT ACCEPT -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited sysctl net.ipv4.ip_forward=1
例 45.3. CentOS 5.6
# iptables-save # Generated by iptables-save v1.3.5 on Sat Dec 31 18:29:51 2011 *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [1516:131654] :RH-Firewall-1-INPUT - [0:0] -A INPUT -j RH-Firewall-1-INPUT -A FORWARD -j RH-Firewall-1-INPUT -A RH-Firewall-1-INPUT -i lo -j ACCEPT -A RH-Firewall-1-INPUT -i eth0 -j ACCEPT -A RH-Firewall-1-INPUT -p icmp -m icmp --icmp-type any -j ACCEPT -A RH-Firewall-1-INPUT -p esp -j ACCEPT -A RH-Firewall-1-INPUT -p ah -j ACCEPT -A RH-Firewall-1-INPUT -d 224.0.0.251 -p udp -m udp --dport 5353 -j ACCEPT -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 1521 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 3306 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 23 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 25 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 21 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 443 -j ACCEPT -A RH-Firewall-1-INPUT -p udp -m state --state NEW -m udp --dport 137 -j ACCEPT -A RH-Firewall-1-INPUT -p udp -m state --state NEW -m udp --dport 138 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 139 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 445 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 2049 -j ACCEPT -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited COMMIT # Completed on Sat Dec 31 18:29:51 2011
# Firewall configuration written by system-config-securitylevel # Manual customization of this file is not recommended. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :RH-Firewall-1-INPUT - [0:0] -A INPUT -j RH-Firewall-1-INPUT -A FORWARD -j RH-Firewall-1-INPUT -A RH-Firewall-1-INPUT -i lo -j ACCEPT -A RH-Firewall-1-INPUT -i eth3 -j ACCEPT -A RH-Firewall-1-INPUT -i eth2 -j ACCEPT -A RH-Firewall-1-INPUT -i eth0 -j ACCEPT -A RH-Firewall-1-INPUT -i eth1 -j ACCEPT -A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT -A RH-Firewall-1-INPUT -p 50 -j ACCEPT -A RH-Firewall-1-INPUT -p 51 -j ACCEPT -A RH-Firewall-1-INPUT -p udp --dport 5353 -d 224.0.0.251 -j ACCEPT -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j ACCEPT -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited COMMIT # Generated by iptables-save v1.3.5 on Wed May 23 10:58:21 2012 *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [43:8584] :RH-Firewall-1-INPUT - [0:0] -A INPUT -j RH-Firewall-1-INPUT -A FORWARD -j RH-Firewall-1-INPUT -A RH-Firewall-1-INPUT -i lo -j ACCEPT -A RH-Firewall-1-INPUT -i eth3 -j ACCEPT -A RH-Firewall-1-INPUT -i eth2 -j ACCEPT -A RH-Firewall-1-INPUT -i eth0 -j ACCEPT -A RH-Firewall-1-INPUT -i eth1 -j ACCEPT -A RH-Firewall-1-INPUT -p icmp -m icmp --icmp-type any -j ACCEPT -A RH-Firewall-1-INPUT -p esp -j ACCEPT -A RH-Firewall-1-INPUT -p ah -j ACCEPT -A RH-Firewall-1-INPUT -d 224.0.0.251 -p udp -m udp --dport 5353 -j ACCEPT -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 443 --tcp-flags FIN,SYN,RST,ACK SYN -m connlimit --connlimit-above 50 --connlimit-mask 32 -j REJECT --reject-with icmp-port-unreachable -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 443 -j ACCEPT -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited COMMIT # Completed on Wed May 23 10:58:21 2012
#!/bin/bash
ACCCESS_LOG=/tmp/myid.access.log
TIMEPOINT='23/May/2012'
BLACKLIST=/var/tmp/black
WHITELIST=/var/tmp/white
if [ ! -f ${BLACKLIST} ]; then
touch ${BLACKLIST}
fi
if [ ! -f ${WHITELIST} ]; then
touch ${WHITELIST}
fi
for deny in $(grep ${TIMEPOINT} ${ACCCESS_LOG} | awk '{print $1}' | awk -F'.' '{print $1"."$2"."$3"."$4}' | sort | uniq -c | sort -r -n | head -n 30| awk '{print $2}')
do
if [ $(grep -c $deny ${WHITELIST}) -ne 0 ]; then
echo 'Allow IP:' $deny
continue
fi
if [ $(grep -c $deny ${BLACKLIST}) -eq 0 ] ; then
echo 'Deny IP:' $deny
echo $deny >> ${BLACKLIST}
iptables -I INPUT -p tcp --dport 443 -s $deny -j DROP
iptables -I INPUT -p tcp --dport 80 -s $deny -j DROP
fi
done