51 lines
1.5 KiB
Nix
51 lines
1.5 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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services.openssh = {
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enable = true;
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settings = {
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PasswordAuthentication = 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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jails = {
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apache-nohome-iptables.settings = {
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# Block an IP address if it accesses a non-existent
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# home directory more than 5 times in 10 minutes,
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# since that indicates that it's scanning.
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filter = "apache-nohome";
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action = ''iptables-multiport[name=HTTP, port="http,https"]'';
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logpath = "/var/log/httpd/error_log*";
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backend = "auto";
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findtime = 600;
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bantime = 600;
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maxretry = 5;
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};
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};
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};
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};
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}
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