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@ -2,21 +2,24 @@ 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. 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.
[Emerging Threats](http://rules.emergingthreats.net/fwrules/) provides similar rules that essentially run `iptables` for *each* blacklisted IP which is extremely inefficient in case of large blacklists. Using `ipset` means using just one `iptables` rule to perform a very efficient lookup in hash structure created by `ipset`.
## Block lists ## Block lists
* [Emerging Threats](http://rules.emergingthreats.net/fwrules/) - list of other known threats (botnet C&C, compromised servers etc) compiled from various sources, including [Spamhaus DROP](http://www.spamhaus.org/drop/), [Shadoserver](https://www.shadowserver.org/wiki/) and [DShield Top Attackers](http://www.dshield.org/top10.html) * [Emerging Threats](http://rules.emergingthreats.net/fwrules/) - list of other known threats (botnet C&C, compromised servers etc) compiled from various sources, including [Spamhaus DROP](http://www.spamhaus.org/drop/), [Shadoserver](https://www.shadowserver.org/wiki/) and [DShield Top Attackers](http://www.dshield.org/top10.html)
* [www.blocklist.de](https://www.blocklist.de/en/index.html) - list of known password bruteforcers supplied by a network of [fail2ban](http://www.fail2ban.org/wiki/index.php/Main_Page) users * [www.blocklist.de](https://www.blocklist.de/en/index.html) - list of known password bruteforcers supplied by a network of [fail2ban](http://www.fail2ban.org/wiki/index.php/Main_Page) users
* [iBlocklist](https://www.iblocklist.com/lists.php) - various free and subscription based lists * [iBlocklist](https://www.iblocklist.com/lists.php) - various free and subscription based lists
* [Bogons](http://www.team-cymru.org/Services/Bogons/) - IP subnets that should never appear on public Internet; this includes RFC 1918 networks, so be careful with deploying in private networks * [Bogons](http://www.team-cymru.org/Services/Bogons/) - IP subnets that should never appear on public Internet; this includes RFC 1918 networks, **be careful with deploying this in private networks**
## firewall.user By default the script will only load Emerging Threats and Blocklist.de collections. Others may be added by simply appending to the `urls` variable in the beginning of the script:
This scripts is indended for OpenWRT routers. It will use the following blocklists by default:
* www.blocklist.de urls="http://rules.emergingthreats.net/fwrules/emerging-Block-IPs.txt"
* Emerging Threats urls="$urls https://www.blocklist.de/downloads/export-ips_all.txt"
* 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. The script ignores empty lines or comments and will only extract anything that looks like an IP address (`a.b.c.d`) or CIDR subnet (`a.b.c.d/nn`). Each blacklist is loaded into a separate `ipset` collection so that logging unambigously identifies which blacklist blocked a packet.
## OpenWRT
The script automatically detects OpenWRT environment (looking for `uci`) and will try to obtain the WAN interface name. The filtering will be then **limited to WAN interface only.**
Requirements: Requirements:
@ -24,42 +27,14 @@ Requirements:
Installation: Installation:
sh firewall.user cp blacklist.sh /etc/firewall.user
cp firewall.user /etc/firewall.user
echo "01 01 * * * sh /etc/firewall.user" >>/etc/crontabs/root echo "01 01 * * * sh /etc/firewall.user" >>/etc/crontabs/root
Results: Manual run:
# iptables -vnL sh /etc/firewall.user
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
## Linux
Requirements: Requirements:
* On Debian, Ubuntu and other `apt` systems: `apt-get install ipset curl` * On Debian, Ubuntu and other `apt` systems: `apt-get install ipset curl`
@ -67,50 +42,9 @@ Requirements:
Installation: Installation:
sh blacklist.sh
cp blacklist.sh /etc/cron.daily/blacklist cp blacklist.sh /etc/cron.daily/blacklist
Results: Manual run:
# iptables -vnL sh /etc/cron.daily/blacklist
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