An Ansible role to install/configure ipset
NOTE: This role will also manage IPTables rules as part of configuring ipset. Any existing IPTables rules WILL be removed.
We have also put together a blog post which is related to this role.
We have also included the ability to use various different IP block lists to
generate ipset rules and iptables rules. These can be easily implemented to
block traffic inbound, outbound, or both inboud/outbound.
- DShield
- FireHOL
- Spamhaus DROP
- DROP
- EDROP
In order to enable the supported block lists you must set the following variables
to true as their defaults are false:
# Defines if DShield top 20 block lists should be defined from https://www.dshield.org/block.txt
ipset_enable_dshield_block_list: false
# Defines if FireHOL ip lists should be defined from http://iplists.firehol.org/
ipset_enable_firehol_block_list: false
# Defines if Spamhaus block lists should be defined from https://www.spamhaus.org/drop/
ipset_enable_spamhaus_block_list: falseWe have added functionality to check if existing rules exist by the same name. If they do exist, a temporary rule set is created which will then be populated. Once the population has completed the existing rule set will be swapped with the temporary rule set, and then the temporary rule set will be destroyed. This will ensure that there is not a time period in which all rules are flushed and then repopulated therefore leaving a short period of time of being out of scope.
The following requirements MUST be met on the Ansible host that is executing this role:
Displaying the list of ipset rule names:
vagrant@node0:~$ sudo ipset list -n
safe_input
dshield_block_list
firehol_block_list
spamhaus_drop_block_list
spamhaus_edrop_block_listDisplaying the complete list of ipset rules:
NOTE: This list is just an example and does not show all of the ipset rules shown above.
vagrant@node0:~$ sudo ipset list
Name: safe_input
Type: hash:net
Revision: 6
Header: family inet hashsize 1024 maxelem 1000111222
Size in memory: 448
References: 1
Members:
10.0.0.0/8
Name: dshield_block_list
Type: hash:net
Revision: 6
Header: family inet hashsize 1024 maxelem 1000111222
Size in memory: 1664
References: 4
Members:
85.93.20.0/24
5.188.203.0/24
104.236.178.0/24
77.72.85.0/24
77.72.82.0/24
181.214.87.0/24
5.188.11.0/24
46.29.162.0/24
141.212.122.0/24
80.82.77.0/24
180.97.106.0/24
185.35.62.0/24
216.158.238.0/24
5.188.86.0/24
191.101.167.0/24
93.174.93.0/24
109.248.9.0/24
5.188.10.0/24
80.82.70.0/24
196.52.43.0/24vagrant@node0:~$ sudo iptables -L -v -n
Chain INPUT (policy DROP 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
824 666K ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED
0 0 LOGGING-DROPPED all -- * * 0.0.0.0/0 0.0.0.0/0 match-set dshield_block_list src
0 0 LOGGING-DROPPED all -- * * 0.0.0.0/0 0.0.0.0/0 match-set firehol_block_list src
0 0 LOGGING-DROPPED all -- * * 0.0.0.0/0 0.0.0.0/0 match-set spamhaus_drop_block_list src
0 0 LOGGING-DROPPED all -- * * 0.0.0.0/0 0.0.0.0/0 match-set spamhaus_edrop_block_list src
1 44 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 multiport dports 22,2202,2222 ctstate NEW match-set safe_input src
0 0 LOGGING-DROPPED all -- * * 0.0.0.0/0 0.0.0.0/0
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy DROP 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 ACCEPT all -- * lo 0.0.0.0/0 0.0.0.0/0
733 61601 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 ctstate ESTABLISHED
0 0 LOGGING-DROPPED all -- * * 0.0.0.0/0 0.0.0.0/0 match-set dshield_block_list dst
0 0 LOGGING-DROPPED all -- * * 0.0.0.0/0 0.0.0.0/0 match-set firehol_block_list dst
0 0 LOGGING-DROPPED all -- * * 0.0.0.0/0 0.0.0.0/0 match-set spamhaus_drop_block_list dst
0 0 LOGGING-DROPPED all -- * * 0.0.0.0/0 0.0.0.0/0 match-set spamhaus_edrop_block_list dst
0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0 ctstate NEW
12 808 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0 multiport dports 53,123 ctstate NEW
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 multiport dports 22,80,443 ctstate NEW
0 0 LOGGING-DROPPED all -- * * 0.0.0.0/0 0.0.0.0/0
Chain LOGGING-DROPPED (10 references)
pkts bytes target prot opt in out source destination
0 0 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 limit: avg 2/min burst 5 LOG flags 0 level 4 prefix "IPTables-Dropped: "
0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0MIT
Larry Smith Jr.
Jeroen Ketelaar