kurogeek
596ac1f4bb
Not every site wants the ban engine (hub sync needs internet at activation, and it is one more moving part on a small box). Gate crowdsec.nix on a new `crowdsec.enable` option like `omada.enable`. gw-cnx-1 keeps it on; the VM test drops its mkForce overrides.
50 lines
1.5 KiB
Nix
50 lines
1.5 KiB
Nix
# CrowdSec security engine + nftables bouncer: parses sshd auth attempts from
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# the journal and bans offending source IPs at the firewall. Log-based (no
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# inline DPI) so it costs the N300 next to nothing. Opt-in per site
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# (`crowdsec.enable`): the hub sync needs internet at activation time.
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{ settings }:
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{ lib, ... }:
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let
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cfg = settings;
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in
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{
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config = lib.mkIf cfg.crowdsec.enable {
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services.crowdsec = {
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enable = true;
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autoUpdateService = true;
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hub.collections = [
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"crowdsecurity/linux"
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"crowdsecurity/sshd"
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];
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localConfig = {
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acquisitions = [
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{
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source = "journalctl";
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journalctl_filter = [ "_SYSTEMD_UNIT=sshd.service" ];
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labels.type = "syslog";
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}
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];
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# Never ban the ZeroTier mesh — it is the only admin path to these
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# boxes (no public SSH), so a false positive would lock us out.
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# Parser-stage whitelist: mesh events are dropped before any scenario.
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parsers.s02Enrich = [
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{
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name = "cnx/mesh-whitelist";
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description = "Whitelist the ZeroTier management mesh";
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whitelist = {
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reason = "ZeroTier mesh is the admin path";
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cidr = [ cfg.mesh.subnet ];
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};
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}
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];
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};
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};
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services.crowdsec-firewall-bouncer = {
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enable = true;
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registerBouncer.enable = true;
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settings.mode = "nftables";
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};
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};
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}
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