102 lines
2.8 KiB
Nix
102 lines
2.8 KiB
Nix
{ config, lib, ... }:
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with lib;
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let
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cfg = config.machine;
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active = name: (elem name cfg.services);
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in mkIf (elem "fail2ban" cfg.services) {
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services.fail2ban = {
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enable = true;
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jails = {
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DEFAULT = ''
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bantime = 3600
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blocktype = DROP
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logpath = /var/log/auth.log
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'';
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ssh = ''
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enabled = ${boolToString (active "openssh")}
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filter = sshd
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maxretry = 4
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action = iptables[name=SSH, port=ssh, protocol=tcp]
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'';
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sshd-ddos = ''
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enabled = ${boolToString (active "openssh")}
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filter = sshd-ddos
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maxretry = 4
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action = iptables[name=ssh, port=ssh, protocol=tcp]
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'';
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postfix = ''
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enabled = ${boolToString (active "mailserver")}
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filter = postfix
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maxretry = 3
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action = iptables[name=postfix, port=smtp, protocol=tcp]
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'';
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postfix-sasl = ''
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enabled = ${boolToString (active "mailserver")}
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filter = postfix-sasl
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port = postfix,imap3,imaps,pop3,pop3s
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maxretry = 3
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action = iptables[name=postfix, port=smtp, protocol=tcp]
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'';
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postfix-ddos = ''
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enabled = ${boolToString (active "mailserver")}
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filter = postfix-ddos
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maxretry = 3
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action = iptables[name=postfix, port=submission, protocol=tcp]
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bantime = 7200
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'';
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nginx-req-limit = ''
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enabled = ${boolToString (active "nginx")}
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filter = nginx-req-limit
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maxretry = 10
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action = iptables-multiport[name=ReqLimit, port="http,https", protocol=tcp]
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findtime = 600
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bantime = 7200
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'';
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};
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};
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environment.etc."fail2ban/filter.d/sshd-ddos.conf" = {
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enable = (active "openssh");
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text = ''
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[Definition]
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failregex = sshd(?:\[\d+\])?: Did not receive identification string from <HOST>$
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ignoreregex =
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'';
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};
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environment.etc."fail2ban/filter.d/postfix-sasl.conf" = {
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enable = (active "mailserver");
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text = ''
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# Fail2Ban filter for postfix authentication failures
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[INCLUDES]
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before = common.conf
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[Definition]
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daemon = postfix/smtpd
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failregex = ^%(__prefix_line)swarning: [-._\w]+\[<HOST>\]: SASL (?:LOGIN|PLAIN|(?:CRAM|DIGEST)-MD5) authentication failed(: [ A-Za-z0-9+/]*={0,2})?\s*$
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'';
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};
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environment.etc."fail2ban/filter.d/postfix-ddos.conf" = {
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enable = (active "mailserver");
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text = ''
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[Definition]
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failregex = lost connection after EHLO from \S+\[<HOST>\]
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'';
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};
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environment.etc."fail2ban/filter.d/nginx-req-limit.conf" = {
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enable = (active "nginx");
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text = ''
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[Definition]
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failregex = limiting requests, excess:.* by zone.*client: <HOST>
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'';
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};
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# Limit stack size to reduce memory usage
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systemd.services.fail2ban.serviceConfig.LimitSTACK = 256 * 1024;
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}
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