2023-05-31 10:01:38 +02:00
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Download, import and update firewall address-lists
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==================================================
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[⬅️ Go back to main README](../README.md)
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> ℹ️ **Info**: This script can not be used on its own but requires the base
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> installation. See [main README](../README.md) for details.
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Description
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-----------
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This script downloads, imports and updates firewall address-lists. Its main
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purpose is to block attacking ip addresses, spam hosts, command-and-control
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servers and similar malicious entities. The default configuration contains
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2023-06-09 16:03:36 +02:00
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lists from [abuse.ch](https://abuse.ch/) and
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[dshield.org](https://dshield.org/).
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2023-05-31 10:01:38 +02:00
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The address-lists are updated in place, so after initial import you will not
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see situation when the lists are not populated.
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To mitigate man-in-the-middle attacks with altered lists the server's
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certificate is checked.
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Requirements and installation
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-----------------------------
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Just install the script:
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$ScriptInstallUpdate fw-addr-lists;
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And add two schedulers, first one for initial import after startup, second
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one for subsequent updates:
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/system/scheduler/add name="fw-addr-lists@startup" start-time=startup on-event="/system/script/run fw-addr-lists;";
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/system/scheduler/add name="fw-addr-lists" start-time=startup interval=2h on-event="/system/script/run fw-addr-lists;";
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> ℹ️ **Info**: Modify the interval to your needs, but it is recommended to
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> use less than half of the configured timeout for expiration.
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Configuration
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-------------
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The configuration goes to `global-config-overlay`, these are the parameters:
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* `FwAddrLists`: a list of firewall address-lists to download and import
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* `FwAddrListTimeOut`: the timeout for expiration without renew
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> ℹ️ **Info**: Copy relevant configuration from
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> [`global-config`](../global-config.rsc) (the one without `-overlay`) to
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> your local `global-config-overlay` and modify it to your specific needs.
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Naming a certificate for a list makes the script verify the server
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certificate, so you should add that if possible. Some certificates are
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available in my repository and downloaded automatically. Import it manually
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(menu `/certificate/`) if missing.
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Create firewall rules to process the packets that are related to addresses
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from address-lists. This rejects the packets from and to ip addresses listed
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in address-list `block`.
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/ip/firewall/filter/add chain=input src-address-list=block action=reject reject-with=icmp-admin-prohibited;
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/ip/firewall/filter/add chain=forward src-address-list=block action=reject reject-with=icmp-admin-prohibited;
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/ip/firewall/filter/add chain=forward dst-address-list=block action=reject reject-with=icmp-admin-prohibited;
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/ip/firewall/filter/add chain=output dst-address-list=block action=reject reject-with=icmp-admin-prohibited;
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You may want to have an address-list to allow specific addresses, as prepared
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with a list `allow`. In fact you can use any list name, just change the
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default ones or add your own - matching in configuration and firewall rules.
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/ip/firewall/filter/add chain=input src-address-list=allow action=accept;
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/ip/firewall/filter/add chain=forward src-address-list=allow action=accept;
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/ip/firewall/filter/add chain=forward dst-address-list=allow action=accept;
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/ip/firewall/filter/add chain=output dst-address-list=allow action=accept;
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Modify these for your needs, but **most important**: Move the rules up in
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chains and make sure they actually take effect as expected!
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Alternatively handle the packets in firewall's raw section if you prefer:
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/ip/firewall/raw/add chain=prerouting src-address-list=block action=drop;
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/ip/firewall/raw/add chain=prerouting dst-address-list=block action=drop;
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/ip/firewall/raw/add chain=output dst-address-list=block action=drop;
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> ⚠️ **Warning**: Just again... The order of firewall rules is important. Make
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> sure they actually take effect as expected!
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---
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[⬅️ Go back to main README](../README.md)
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[⬆️ Go back to top](#top)
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