41 lines
1.1 KiB
Nix
41 lines
1.1 KiB
Nix
{ config, lib, ... }:
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let
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cfg = config.profile.openssh;
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in
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{
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config = lib.mkIf cfg.enable {
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networking.firewall = {
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allowedTCPPorts = lib.mkAfter [ 22 ];
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};
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services.openssh = {
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enable = true;
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settings = {
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PasswordAuthentication = false;
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KbdInteractiveAuthentication = false;
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UseDns = true;
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X11Forwarding = false;
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PermitRootLogin = "no";
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};
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};
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services.fail2ban = {
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enable = true;
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# Ban IP after 5 failures
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maxretry = 5;
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ignoreIP = [
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# Whitelist some subnets
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"10.0.0.0/8"
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"172.16.0.0/12"
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"192.168.0.0/16"
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];
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bantime = "24h"; # Ban IPs for one day on the first ban
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bantime-increment = {
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enable = true; # Enable increment of bantime after each violation
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formula = "ban.Time * math.exp(float(ban.Count+1)*banFactor)/math.exp(1*banFactor)";
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# multipliers = "1 2 4 8 16 32 64";
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maxtime = "168h"; # Do not ban for more than 1 week
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overalljails = true; # Calculate the bantime based on all the violations
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};
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};
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};
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}
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