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Download, import and update firewall address-lists
==================================================
[⬅️ Go back to main README](../README.md)
> ℹ️ **Info**: This script can not be used on its own but requires the base
> installation. See [main README](../README.md) 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
a list from [dshield.org](https://dshield.org/).
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 import
* `FwAddrListTimeOut`: the timeout for expiration without renew
> ℹ️ **Info**: Copy relevant configuration from
> [`global-config`](../global-config.rsc) (the one without `-overlay`) to
> your local `global-config-overlay` and 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!
---
[⬅️ Go back to main README](../README.md)
[⬆️ Go back to top](#top)
|