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Pawel Krawczyk 1d865b2111 make rules stateless to catch existing connections		2015-01-07 10:13:25 +00:00
blacklist.sh	make rules stateless so that new blacklist entry works for existing connections as well	2015-01-06 10:19:16 +00:00
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README.md	formatting	2014-10-01 12:47:21 +01:00

README.md

blacklist-scripts

This is a collection of shell scripts that are intended to block Linux systems and OpenWRT routers from known sources of malicious traffic. These scripts use iptables with highly efficient ipset module to check incoming traffic against blacklists populated from publicly available sources.

Block lists

Emerging Threats - list of other known threats (botnet C&C, compromised servers etc) compiled from various sources, including Spamhaus DROP, Shadoserver and DShield Top Attackers
www.blocklist.de - list of known password bruteforcers supplied by a network of fail2ban users
iBlocklist - various free and subscription based lists
Bogons - IP subnets that should never appear on public Internet; this includes RFC 1918 networks, so be careful with deploying in private networks

firewall.user

This scripts is indended for OpenWRT routers. It will use the following blocklists by default:

www.blocklist.de
Emerging Threats
Bogons

As it includes Bogons, it only checks incoming traffic on the WAN interface of the router. Obviously, if your WAN interface is on RFC 1918 network, you might lose connectivity from that side.

Requirements:

opkg install ipset curl

Installation:

sh firewall.user
cp firewall.user /etc/firewall.user
echo "01 01 * * * sh /etc/firewall.user" >>/etc/crontabs/root

Results:

# iptables -vnL
Chain blocklists (2 references)
 pkts bytes target     prot opt in     out     source               destination         
    0     0 LOG        all  --  eth0.2 *       0.0.0.0/0            0.0.0.0/0           match-set emerging-Block-IPs.txt src,dst limit: avg 10/min burst 5 LOG flags 0 level 4 prefix `BLOCK emerging-Block-IPs.txt ' 
    0     0 DROP       all  --  eth0.2 *       0.0.0.0/0            0.0.0.0/0           match-set emerging-Block-IPs.txt src,dst 
    0     0 LOG        all  --  eth0.2 *       0.0.0.0/0            0.0.0.0/0           match-set fullbogons-ipv4.txt src,dst limit: avg 10/min burst 5 LOG flags 0 level 4 prefix `BLOCK fullbogons-ipv4.txt ' 
    0     0 DROP       all  --  eth0.2 *       0.0.0.0/0            0.0.0.0/0           match-set fullbogons-ipv4.txt src,dst 
    6   783 LOG        all  --  eth0.2 *       0.0.0.0/0            0.0.0.0/0           match-set export-ips_all.txt src,dst limit: avg 10/min burst 5 LOG flags 0 level 4 prefix `BLOCK export-ips_all.txt ' 
    6   783 DROP       all  --  eth0.2 *       0.0.0.0/0            0.0.0.0/0           match-set export-ips_all.txt src,dst 

Chain forward (1 references)
 pkts bytes target     prot opt in     out     source               destination         
 14994 1753K blocklists  all  --  *      *       0.0.0.0/0            0.0.0.0/0           state NEW,RELATED 
 ...

Chain input (1 references)
 pkts bytes target     prot opt in     out     source               destination         
  250 13802 blocklists  all  --  *      *       0.0.0.0/0            0.0.0.0/0           state NEW,RELATED
  ...

# ipset list | wc -l
21553

blacklist.sh

This script is intended for Linux servers. It does not load Bogons blocklist which can cause serious problems in VPS environments. Blacklists used:

www.blocklist.de
Emerging Threats

Requirements:

On Debian, Ubuntu and other apt systems: apt-get install ipset curl
On RedHat, Fedora, CentOS and other RPM systems: yum install ipset curl

Installation:

sh blacklist.sh
cp blacklist.sh /etc/cron.daily/blacklist

Results:

# iptables -vnL
Chain INPUT (policy ACCEPT 40M packets, 159G bytes)
 pkts bytes target     prot opt in     out     source               destination         
5622K  350M blacklist  all  --  *      *       0.0.0.0/0            0.0.0.0/0           state NEW 

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain OUTPUT (policy ACCEPT 39M packets, 166G bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain blacklist (1 references)
 pkts bytes target     prot opt in     out     source               destination         
   11   488 LOG        all  --  *      *       0.0.0.0/0            0.0.0.0/0           match-set blacklist src limit: avg 1/min burst 5 LOG flags 0 level 4 prefix `BLACKLIST ' 
   11   488 DROP       all  --  *      *       0.0.0.0/0            0.0.0.0/0           match-set blacklist src

# ipset list | wc -l
22590

# ipset list | head
Name: blacklist
Type: hash:net
Header: family inet hashsize 8192 maxelem 65536 
Size in memory: 416688
References: 2
Members:
183.141.72.28
201.210.28.205
222.186.56.11
178.137.16.203

# dmesg|tail
BLACKLIST IN=eth0 OUT= MAC=00:50:56:a0:11:61:44:d3:ca:0f:20:b7:08:00 SRC=61.174.51.198 DST=192.168.100.8 LEN=40 TOS=0x00 PREC=0x00 TTL=102 ID=256 PROTO=TCP SPT=6000 DPT=22 WINDOW=16384 RES=0x00 SYN URGP=0 
BLACKLIST IN=eth0 OUT= MAC=00:50:56:a0:11:61:44:d3:ca:0f:20:b7:08:00 SRC=141.212.121.232 DST=192.168.100.8 LEN=40 TOS=0x00 PREC=0x00 TTL=232 ID=54321 PROTO=TCP SPT=51441 DPT=443 WINDOW=65535 RES=0x00 SYN URGP=0 
BLACKLIST IN=eth0 OUT= MAC=00:50:56:a0:11:61:44:d3:ca:0f:20:b7:08:00 SRC=58.241.61.162 DST=192.168.100.8 LEN=48 TOS=0x00 PREC=0x00 TTL=111 ID=17539 PROTO=TCP SPT=4127 DPT=80 WINDOW=65535 RES=0x00 SYN URGP=0 
BLACKLIST IN=eth0 OUT= MAC=00:50:56:a0:11:61:44:d3:ca:0f:20:b7:08:00 SRC=122.225.109.116 DST=192.168.100.8 LEN=40 TOS=0x00 PREC=0x00 TTL=102 ID=256 PROTO=TCP SPT=6000 DPT=22 WINDOW=16384 RES=0x00 SYN URGP=0 
BLACKLIST IN=eth0 OUT= MAC=00:50:56:a0:11:61:44:d3:ca:0f:20:b7:08:00 SRC=122.225.103.78 DST=192.168.100.8 LEN=40 TOS=0x00 PREC=0x00 TTL=102 ID=256 PROTO=TCP SPT=6000 DPT=22 WINDOW=16384 RES=0x00 SYN URGP=0 
BLACKLIST IN=eth0 OUT= MAC=00:50:56:a0:11:61:44:d3:ca:0f:20:b7:08:00 SRC=122.225.109.115 DST=192.168.100.8 LEN=40 TOS=0x00 PREC=0x00 TTL=102 ID=256 PROTO=TCP SPT=6000 DPT=22 WINDOW=16384 RES=0x00 SYN URGP=0 
BLACKLIST IN=eth0 OUT= MAC=00:50:56:a0:11:61:44:d3:ca:0f:20:b7:08:00 SRC=122.225.109.208 DST=192.168.100.8 LEN=40 TOS=0x00 PREC=0x00 TTL=102 ID=256 PROTO=TCP SPT=6000 DPT=22 WINDOW=16384 RES=0x00 SYN URGP=0 
BLACKLIST IN=eth0 OUT= MAC=00:50:56:a0:11:61:44:d3:ca:0f:20:b7:08:00 SRC=61.174.51.200 DST=192.168.100.8 LEN=40 TOS=0x00 PREC=0x00 TTL=102 ID=256 PROTO=TCP SPT=6000 DPT=22 WINDOW=16384 RES=0x00 SYN URGP=0 
BLACKLIST IN=eth0 OUT= MAC=00:50:56:a0:11:61:44:d3:ca:0f:20:b7:08:00 SRC=198.71.58.200 DST=192.168.100.8 LEN=60 TOS=0x00 PREC=0x00 TTL=51 ID=52934 DF PROTO=TCP SPT=59939 DPT=22 WINDOW=14600 RES=0x00 SYN URGP=0 
BLACKLIST IN=eth0 OUT= MAC=00:50:56:a0:11:61:44:d3:ca:0f:20:b7:08:00 SRC=198.71.58.200 DST=192.168.100.8 LEN=60 TOS=0x00 PREC=0x00 TTL=51 ID=52935 DF PROTO=TCP SPT=59939 DPT=22 WINDOW=14600 RES=0x00 SYN URGP=0