4 KiB
Download, import and update firewall address-lists
ℹ️ Info: This script can not be used on its own but requires the base installation. See main README for details.
Description
This script downloads, imports and updates firewall address-lists. Its main purpose is to block attacking ip addresses, spam hosts, command-and-control servers and similar malicious entities. The default configuration contains lists from abuse.ch and dshield.org, and lists from spamhaus.org are prepared.
The address-lists are updated in place, so after initial import you will not see situation when the lists are not populated.
To mitigate man-in-the-middle attacks with altered lists the server's certificate is checked.
Requirements and installation
Just install the script:
$ScriptInstallUpdate fw-addr-lists;
And add two schedulers, first one for initial import after startup, second one for subsequent updates:
/system/scheduler/add name="fw-addr-lists@startup" start-time=startup on-event="/system/script/run fw-addr-lists;";
/system/scheduler/add name="fw-addr-lists" start-time=startup interval=2h on-event="/system/script/run fw-addr-lists;";
ℹ️ Info: Modify the interval to your needs, but it is recommended to use less than half of the configured timeout for expiration.
Configuration
The configuration goes to global-config-overlay, these are the parameters:
FwAddrLists: a list of firewall address-lists to download and importFwAddrListTimeOut: the timeout for expiration without renew
ℹ️ Info: Copy relevant configuration from
global-config(the one without-overlay) to your localglobal-config-overlayand modify it to your specific needs.
Naming a certificate for a list makes the script verify the server
certificate, so you should add that if possible. Some certificates are
available in my repository and downloaded automatically. Import it manually
(menu /certificate/) if missing.
Create firewall rules to process the packets that are related to addresses
from address-lists. This rejects the packets from and to ip addresses listed
in address-list block.
/ip/firewall/filter/add chain=input src-address-list=block action=reject reject-with=icmp-admin-prohibited;
/ip/firewall/filter/add chain=forward src-address-list=block action=reject reject-with=icmp-admin-prohibited;
/ip/firewall/filter/add chain=forward dst-address-list=block action=reject reject-with=icmp-admin-prohibited;
/ip/firewall/filter/add chain=output dst-address-list=block action=reject reject-with=icmp-admin-prohibited;
You may want to have an address-list to allow specific addresses, as prepared
with a list allow. In fact you can use any list name, just change the
default ones or add your own - matching in configuration and firewall rules.
/ip/firewall/filter/add chain=input src-address-list=allow action=accept;
/ip/firewall/filter/add chain=forward src-address-list=allow action=accept;
/ip/firewall/filter/add chain=forward dst-address-list=allow action=accept;
/ip/firewall/filter/add chain=output dst-address-list=allow action=accept;
Modify these for your needs, but most important: Move the rules up in chains and make sure they actually take effect as expected!
Alternatively handle the packets in firewall's raw section if you prefer:
/ip/firewall/raw/add chain=prerouting src-address-list=block action=drop;
/ip/firewall/raw/add chain=prerouting dst-address-list=block action=drop;
/ip/firewall/raw/add chain=output dst-address-list=block action=drop;
⚠️ Warning: Just again... The order of firewall rules is important. Make sure they actually take effect as expected!