iptables-shell脚本

post by rocdk890 / 2013-7-1 9:41 Monday linux技术
给大家推授个很好的iptables-shell脚本,让大家从麻烦的iptables配置中解脱出来,脚本作者是谁,我不敢确定,所以删除了版本声明.
系统:centos 5.9
脚本内容:
vi iptables.sh
#!/bin/sh 
#------------------------------------------------------------------------------  
# For debugging use iptables -v. 
IPTABLES="/sbin/iptables" 
IP6TABLES="/sbin/ip6tables" 
MODPROBE="/sbin/modprobe" 
RMMOD="/sbin/rmmod" 
ARP="/usr/sbin/arp" 
 
 
# Logging options. 
#------------------------------------------------------------------------------ 
LOG="LOG --log-level debug --log-tcp-sequence --log-tcp-options" 
LOG="$LOG --log-ip-options" 
 
 
# Defaults for rate limiting 
#------------------------------------------------------------------------------ 
RLIMIT="-m limit --limit 3/s --limit-burst 8" 
 
 
# Unprivileged ports. 
#------------------------------------------------------------------------------ 
PHIGH="1024:65535" 
PSSH="1000:1023" 
 
 
# Load required kernel modules 
#------------------------------------------------------------------------------ 
$MODPROBE ip_conntrack_ftp 
$MODPROBE ip_conntrack_irc 
 
 
# Mitigate ARP spoofing/poisoning and similar attacks. 
#------------------------------------------------------------------------------ 
# Hardcode static ARP cache entries here 
# $ARP -s IP-ADDRESS MAC-ADDRESS 
 
 
# Kernel configuration. 
#------------------------------------------------------------------------------ 
 
# Disable IP forwarding. 
# On => Off = (reset) 
echo 1 > /proc/sys/net/ipv4/ip_forward 
echo 0 > /proc/sys/net/ipv4/ip_forward 
 
# Enable IP spoofing protection 
for i in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 1 > $i; done 
 
# Protect against SYN flood attacks 
echo 1 > /proc/sys/net/ipv4/tcp_syncookies 
 
# Ignore all incoming ICMP echo requests 
echo 0 > /proc/sys/net/ipv4/icmp_echo_ignore_all 
 
# Ignore ICMP echo requests to broadcast 
echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts 
 
# Log packets with impossible addresses. 
for i in /proc/sys/net/ipv4/conf/*/log_martians; do echo 1 > $i; done 
 
# Don't log invalid responses to broadcast 
echo 1 > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses 
 
# Don't accept or send ICMP redirects. 
for i in /proc/sys/net/ipv4/conf/*/accept_redirects; do echo 0 > $i; done 
for i in /proc/sys/net/ipv4/conf/*/send_redirects; do echo 0 > $i; done 
 
# Don't accept source routed packets. 
for i in /proc/sys/net/ipv4/conf/*/accept_source_route; do echo 0 > $i; done 
 
# Disable multicast routing 
##for i in /proc/sys/net/ipv4/conf/*/mc_forwarding; do echo 0 > $i; done 
 
# Disable proxy_arp. 
for i in /proc/sys/net/ipv4/conf/*/proxy_arp; do echo 0 > $i; done 
 
# Enable secure redirects, i.e. only accept ICMP redirects for gateways 
# Helps against MITM attacks. 
for i in /proc/sys/net/ipv4/conf/*/secure_redirects; do echo 1 > $i; done 
 
# Disable bootp_relay 
for i in /proc/sys/net/ipv4/conf/*/bootp_relay; do echo 0 > $i; done 
 
# Default policies. 
#------------------------------------------------------------------------------ 
 
# Drop everything by default. 
$IPTABLES -P INPUT DROP 
$IPTABLES -P FORWARD DROP 
$IPTABLES -P OUTPUT DROP 
 
# Set the nat/mangle/raw tables' chains to ACCEPT 
$IPTABLES -t nat -P PREROUTING ACCEPT 
$IPTABLES -t nat -P OUTPUT ACCEPT 
$IPTABLES -t nat -P POSTROUTING ACCEPT 
 
$IPTABLES -t mangle -P PREROUTING ACCEPT 
$IPTABLES -t mangle -P INPUT ACCEPT 
$IPTABLES -t mangle -P FORWARD ACCEPT 
$IPTABLES -t mangle -P OUTPUT ACCEPT 
$IPTABLES -t mangle -P POSTROUTING ACCEPT 
 
# Cleanup. 
#------------------------------------------------------------------------------ 
 
# Delete all 
$IPTABLES -F 
$IPTABLES -t nat -F 
$IPTABLES -t mangle -F 
 
# Delete all 
$IPTABLES -X 
$IPTABLES -t nat -X 
$IPTABLES -t mangle -X 
 
# Zero all packets and counters. 
$IPTABLES -Z 
$IPTABLES -t nat -Z 
$IPTABLES -t mangle -Z 
 
# Completely disable IPv6. 
#------------------------------------------------------------------------------ 
 
# Block all IPv6 traffic 
# If the ip6tables command is available, try to block all IPv6 traffic. 
if test -x $IP6TABLES; then 
# Set the default policies 
# drop everything 
$IP6TABLES -P INPUT DROP 2>/dev/null 
$IP6TABLES -P FORWARD DROP 2>/dev/null 
$IP6TABLES -P OUTPUT DROP 2>/dev/null 
 
# The mangle table can pass everything 
$IP6TABLES -t mangle -P PREROUTING ACCEPT 2>/dev/null 
$IP6TABLES -t mangle -P INPUT ACCEPT 2>/dev/null 
$IP6TABLES -t mangle -P FORWARD ACCEPT 2>/dev/null 
$IP6TABLES -t mangle -P OUTPUT ACCEPT 2>/dev/null 
$IP6TABLES -t mangle -P POSTROUTING ACCEPT 2>/dev/null 
 
# Delete all rules. 
$IP6TABLES -F 2>/dev/null 
$IP6TABLES -t mangle -F 2>/dev/null 
 
# Delete all chains. 
$IP6TABLES -X 2>/dev/null 
$IP6TABLES -t mangle -X 2>/dev/null 
 
# Zero all packets and counters. 
$IP6TABLES -Z 2>/dev/null 
$IP6TABLES -t mangle -Z 2>/dev/null 
fi 
 
# Custom user-defined chains. 
#------------------------------------------------------------------------------ 
 
# LOG packets, then ACCEPT. 
$IPTABLES -N ACCEPTLOG 
$IPTABLES -A ACCEPTLOG -j $LOG $RLIMIT --log-prefix "ACCEPT " 
$IPTABLES -A ACCEPTLOG -j ACCEPT 
 
# LOG packets, then DROP. 
$IPTABLES -N DROPLOG 
$IPTABLES -A DROPLOG -j $LOG $RLIMIT --log-prefix "DROP " 
$IPTABLES -A DROPLOG -j DROP 
 
# LOG packets, then REJECT. 
# TCP packets are rejected with a TCP reset. 
$IPTABLES -N REJECTLOG 
$IPTABLES -A REJECTLOG -j $LOG $RLIMIT --log-prefix "REJECT " 
$IPTABLES -A REJECTLOG -p tcp -j REJECT --reject-with tcp-reset 
$IPTABLES -A REJECTLOG -j REJECT 
 
# Only allows RELATED ICMP types 
# (destination-unreachable, time-exceeded, and parameter-problem). 
# TODO: Rate-limit this traffic? 
# TODO: Allow fragmentation-needed? 
# TODO: Test. 
$IPTABLES -N RELATED_ICMP 
$IPTABLES -A RELATED_ICMP -p icmp --icmp-type destination-unreachable -j ACCEPT 
$IPTABLES -A RELATED_ICMP -p icmp --icmp-type time-exceeded -j ACCEPT 
$IPTABLES -A RELATED_ICMP -p icmp --icmp-type parameter-problem -j ACCEPT 
$IPTABLES -A RELATED_ICMP -j DROPLOG 
 
# Make It Even Harder To Multi-PING 
$IPTABLES  -A INPUT -p icmp -m limit --limit 1/s --limit-burst 2 -j ACCEPT 
$IPTABLES  -A INPUT -p icmp -m limit --limit 1/s --limit-burst 2 -j LOG --log-prefix PING-DROP: 
$IPTABLES  -A INPUT -p icmp -j DROP 
$IPTABLES  -A OUTPUT -p icmp -j ACCEPT 
 
# Only allow the minimally required/recommended parts of ICMP. Block the rest. 
#------------------------------------------------------------------------------ 
 
# TODO: This section needs a lot of testing! 
 
# First, drop all fragmented ICMP packets (almost always malicious). 
$IPTABLES -A INPUT -p icmp --fragment -j DROPLOG 
$IPTABLES -A OUTPUT -p icmp --fragment -j DROPLOG 
$IPTABLES -A FORWARD -p icmp --fragment -j DROPLOG 
 
# Allow all ESTABLISHED ICMP traffic. 
$IPTABLES -A INPUT -p icmp -m state --state ESTABLISHED -j ACCEPT $RLIMIT 
$IPTABLES -A OUTPUT -p icmp -m state --state ESTABLISHED -j ACCEPT $RLIMIT 
 
# Allow some parts of the RELATED ICMP traffic, block the rest. 
$IPTABLES -A INPUT -p icmp -m state --state RELATED -j RELATED_ICMP $RLIMIT 
$IPTABLES -A OUTPUT -p icmp -m state --state RELATED -j RELATED_ICMP $RLIMIT 
 
# Allow incoming ICMP echo requests (ping), but only rate-limited. 
$IPTABLES -A INPUT -p icmp --icmp-type echo-request -j ACCEPT $RLIMIT 
 
# Allow outgoing ICMP echo requests (ping), but only rate-limited. 
$IPTABLES -A OUTPUT -p icmp --icmp-type echo-request -j ACCEPT $RLIMIT 
 
# Drop any other ICMP traffic. 
$IPTABLES -A INPUT -p icmp -j DROPLOG 
$IPTABLES -A OUTPUT -p icmp -j DROPLOG 
$IPTABLES -A FORWARD -p icmp -j DROPLOG 
 
# Selectively allow certain special types of traffic. 
#------------------------------------------------------------------------------ 
 
# Allow loopback interface to do anything. 
$IPTABLES -A INPUT -i lo -j ACCEPT 
$IPTABLES -A OUTPUT -o lo -j ACCEPT 
 
# Allow incoming connections related to existing allowed connections. 
$IPTABLES -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT 
 
# Allow outgoing connections EXCEPT invalid 
$IPTABLES -A OUTPUT -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT 
 
# Miscellaneous. 
#------------------------------------------------------------------------------ 
 
# We don't care about Milkosoft, Drop SMB/CIFS/etc.. 
$IPTABLES -A INPUT -p tcp -m multiport --dports 135,137,138,139,445,1433,1434 -j DROP 
$IPTABLES -A INPUT -p udp -m multiport --dports 135,137,138,139,445,1433,1434 -j DROP 
 
# Explicitly drop invalid incoming traffic 
$IPTABLES -A INPUT -m state --state INVALID -j DROP 
 
# Drop invalid outgoing traffic, too. 
$IPTABLES -A OUTPUT -m state --state INVALID -j DROP 
 
# If we would use NAT, INVALID packets would pass - BLOCK them anyways 
$IPTABLES -A FORWARD -m state --state INVALID -j DROP 
 
# PORT Scanners (stealth also) 
$IPTABLES -A INPUT -m state --state NEW -p tcp --tcp-flags ALL ALL -j DROP 
$IPTABLES -A INPUT -m state --state NEW -p tcp --tcp-flags ALL NONE -j DROP 
 
# TODO: Some more anti-spoofing rules? For example: 
# $IPTABLES -A INPUT -p tcp --tcp-flags ALL FIN,URG,PSH -j DROP 
# $IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP 
# $IPTABLES -A INPUT -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP 
$IPTABLES -N SYN_FLOOD 
$IPTABLES -A INPUT -p tcp --syn -j SYN_FLOOD 
$IPTABLES -A SYN_FLOOD -m limit --limit 2/s --limit-burst 6 -j RETURN 
$IPTABLES -A SYN_FLOOD -j DROP 
 
# TODO: Block known-bad IPs (see http://www.dshield.org/top10.php). 
# $IPTABLES -A INPUT -s INSERT-BAD-IP-HERE -j DROPLOG 
 
# Drop any traffic from IANA-reserved IPs. 
#------------------------------------------------------------------------------ 
 
$IPTABLES -A INPUT -s 0.0.0.0/7 -j DROP 
$IPTABLES -A INPUT -s 2.0.0.0/8 -j DROP 
$IPTABLES -A INPUT -s 5.0.0.0/8 -j DROP 
$IPTABLES -A INPUT -s 7.0.0.0/8 -j DROP 
$IPTABLES -A INPUT -s 10.0.0.0/8 -j DROP 
$IPTABLES -A INPUT -s 23.0.0.0/8 -j DROP 
$IPTABLES -A INPUT -s 27.0.0.0/8 -j DROP 
$IPTABLES -A INPUT -s 31.0.0.0/8 -j DROP 
$IPTABLES -A INPUT -s 36.0.0.0/7 -j DROP 
$IPTABLES -A INPUT -s 39.0.0.0/8 -j DROP 
$IPTABLES -A INPUT -s 42.0.0.0/8 -j DROP 
$IPTABLES -A INPUT -s 49.0.0.0/8 -j DROP 
$IPTABLES -A INPUT -s 50.0.0.0/8 -j DROP 
$IPTABLES -A INPUT -s 77.0.0.0/8 -j DROP 
$IPTABLES -A INPUT -s 78.0.0.0/7 -j DROP 
$IPTABLES -A INPUT -s 92.0.0.0/6 -j DROP 
$IPTABLES -A INPUT -s 96.0.0.0/4 -j DROP 
$IPTABLES -A INPUT -s 112.0.0.0/5 -j DROP 
$IPTABLES -A INPUT -s 120.0.0.0/8 -j DROP 
$IPTABLES -A INPUT -s 169.254.0.0/16 -j DROP 
$IPTABLES -A INPUT -s 172.16.0.0/12 -j DROP 
$IPTABLES -A INPUT -s 173.0.0.0/8 -j DROP 
$IPTABLES -A INPUT -s 174.0.0.0/7 -j DROP 
$IPTABLES -A INPUT -s 176.0.0.0/5 -j DROP 
$IPTABLES -A INPUT -s 184.0.0.0/6 -j DROP 
$IPTABLES -A INPUT -s 192.0.2.0/24 -j DROP 
$IPTABLES -A INPUT -s 197.0.0.0/8 -j DROP 
$IPTABLES -A INPUT -s 198.18.0.0/15 -j DROP 
$IPTABLES -A INPUT -s 223.0.0.0/8 -j DROP 
$IPTABLES -A INPUT -s 224.0.0.0/3 -j DROP 
 
# Selectively allow certain outbound connections, block the rest. 
#------------------------------------------------------------------------------ 
 
# Allow outgoing DNS requests. Few things will work without this. 
$IPTABLES -A OUTPUT -m state --state NEW -p udp --dport 53 -j ACCEPT 
$IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 53 -j ACCEPT 
 
# Allow outgoing HTTP requests. Unencrypted, use with care. 
$IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 80 -j ACCEPT 
 
# Allow outgoing HTTPS requests. 
$IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 443 -j ACCEPT 
 
# Allow outgoing SMTPS requests. Do NOT allow unencrypted SMTP! 
# $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 465 -j ACCEPT 
 
# Allow outgoing "submission" (RFC 2476) requests. 
$IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 587 -j ACCEPT 
 
# Allow outgoing POP3S requests. 
$IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 995 -j ACCEPT 
 
# Allow outgoing SSH requests. 
$IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 22 -j ACCEPT 
 
# Allow outgoing FTP requests. Unencrypted, use with care. 
$IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 21 -j ACCEPT 
 
# Allow outgoing NNTP requests. Unencrypted, use with care. 
# $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 119 -j ACCEPT 
 
# Allow outgoing NTP requests. Unencrypted, use with care. 
# $IPTABLES -A OUTPUT -m state --state NEW -p udp --dport 123 -j ACCEPT 
 
# Allow outgoing IRC requests. Unencrypted, use with care. 
# Note: This usually needs the ip_conntrack_irc kernel module. 
# $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 6667 -j ACCEPT 
 
# Allow outgoing requests to various proxies. Unencrypted, use with care. 
# $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 8080 -j ACCEPT 
# $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 8090 -j ACCEPT 
 
# Allow outgoing DHCP requests. Unencrypted, use with care. 
# TODO: This is completely untested, I have no idea whether it works! 
# TODO: I think this can be tightened a bit more. 
$IPTABLES -A OUTPUT -m state --state NEW -p udp --sport 67:68 --dport 67:68 -j ACCEPT 
 
# Allow outgoing CVS requests. Unencrypted, use with care. 
# $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 2401 -j ACCEPT 
 
# Allow outgoing MySQL requests. Unencrypted, use with care. 
# $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 3306 -j ACCEPT 
 
# Allow outgoing SVN requests. Unencrypted, use with care. 
# $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 3690 -j ACCEPT 
 
# Allow outgoing PLESK requests. Unencrypted, use with care. 
# $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 8443 -j ACCEPT 
 
# Allow outgoing Tor (http://tor.eff.org) requests. 
# Note: Do _not_ use unencrypted protocols over Tor (sniffing is possible)! 
# $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 9001 -j ACCEPT 
# $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 9002 -j ACCEPT 
# $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 9030 -j ACCEPT 
# $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 9031 -j ACCEPT 
# $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 9090 -j ACCEPT 
# $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 9091 -j ACCEPT 
 
# Allow outgoing OpenVPN requests. 
$IPTABLES -A OUTPUT -m state --state NEW -p udp --dport 1194 -j ACCEPT 
 
# TODO: ICQ, MSN, GTalk, Skype, Yahoo, etc... 
 
# Selectively allow certain inbound connections, block the rest. 
#------------------------------------------------------------------------------ 
 
# Allow incoming DNS requests. 
$IPTABLES -A INPUT -m state --state NEW -p udp --dport 53 -j ACCEPT 
$IPTABLES -A INPUT -m state --state NEW -p tcp --dport 53 -j ACCEPT 
 
# Allow incoming HTTP requests. 
$IPTABLES -A INPUT -m state --state NEW -p tcp --dport 80 -j ACCEPT 
 
# Allow incoming HTTPS requests. 
$IPTABLES -A INPUT -m state --state NEW -p tcp --dport 443 -j ACCEPT 
 
# Allow incoming POP3 requests. 
$IPTABLES -A INPUT -m state --state NEW -p tcp --dport 110 -j ACCEPT 
 
# Allow incoming IMAP4 requests. 
$IPTABLES -A INPUT -m state --state NEW -p tcp --dport 143 -j ACCEPT 
 
# Allow incoming POP3S requests. 
$IPTABLES -A INPUT -m state --state NEW -p tcp --dport 995 -j ACCEPT 
 
# Allow incoming SMTP requests. 
$IPTABLES -A INPUT -m state --state NEW -p tcp --dport 25 -j ACCEPT 
 
# Allow incoming SSH requests. 
$IPTABLES -A INPUT -m state --state NEW -p tcp --dport 22 -j ACCEPT 
 
# Allow incoming FTP requests. 
$IPTABLES -A INPUT -m state --state NEW -p tcp --dport 21 -j ACCEPT 
 
# Allow incoming NNTP requests. 
# $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 119 -j ACCEPT 
 
# Allow incoming MySQL requests. 
# $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 3306 -j ACCEPT 
 
# Allow incoming PLESK requests. 
# $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 8843 -j ACCEPT 
 
# Allow incoming BitTorrent requests. 
# TODO: Are these already handled by ACCEPTing established/related traffic? 
# $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 6881 -j ACCEPT 
# $IPTABLES -A INPUT -m state --state NEW -p udp --dport 6881 -j ACCEPT 
 
# Allow incoming nc requests. 
# $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 2030 -j ACCEPT 
# $IPTABLES -A INPUT -m state --state NEW -p udp --dport 2030 -j ACCEPT 
 
# Explicitly log and reject everything else. 
#------------------------------------------------------------------------------ 
# Use REJECT instead of REJECTLOG if you don't need/want logging. 
$IPTABLES -A INPUT -j REJECTLOG 
$IPTABLES -A OUTPUT -j REJECTLOG 
$IPTABLES -A FORWARD -j REJECTLOG 
 
 
#------------------------------------------------------------------------------ 
# Testing the firewall. 
#------------------------------------------------------------------------------ 
 
# You should check/test that the firewall really works, using 
# iptables -vnL, nmap, ping, telnet, ... 
 
# Exit gracefully. 
#------------------------------------------------------------------------------ 
 
    exit 0
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