servers/losurdo/fail2ban.nix

   1 { pkgs, lib, config, servers, ... }:
   2 {
   3 services.sshd.logLevel = "VERBOSE";
   4 services.postgresql.extraConfig = "log_line_prefix = '%h '";
   5 services.fail2ban = {
   6   enable = true;
   7   banaction = "nftables-multiport";
   8   banaction-allports = "nftables-allports";
   9   bantime-increment = {
  10     enable = true;
  11     factor = "1";
  12     formula = "ban.Time * (1 << min(ban.Count, 20)) * banFactor";
  13     maxtime = "1y";
  14     multipliers = "";
  15     overalljails = false;
  16     rndtime = "";
  17   };
  18   packageFirewall = pkgs.nftables;
  19   ignoreIP = [
  20     servers.mermet.ipv4
  21     servers.losurdo.ipv4
  22     "198.252.154.1" # wren.riseup.net
  23   ];
  24   jails = {
  25     DEFAULT = ''
  26     '';
  27     sshd = ''
  28       enabled = true
  29       bantime = 5m
  30       findtime = 1d
  31       maxretry = 1
  32       mode = aggressive
  33     '';
  34     postgresql = ''
  35       enabled = true
  36       bantime = 1m
  37       filter = postgresql
  38       findtime = 1d
  39       port = 5432
  40     '';
  41   };
  42 };
  43 environment.etc."fail2ban/action.d/nftables-common.local".text = ''
  44   [Init]
  45   blocktype = drop
  46 '';
  47 environment.etc."fail2ban/filter.d/postgresql.local".text = ''
  48   [INCLUDES]
  49   before = common.conf
  50   [DEFAULT]
  51   _daemon = postgresql-start
  52   [Definition]
  53   journalmatch = _SYSTEMD_UNIT=postgresql.service + _COMM=postgres
  54   prefregex = ^<F-MLFID>%(__prefix_line)s</F-MLFID><F-CONTENT>.+</F-CONTENT>$
  55   failregex = ^<HOST>\s+FATAL:\s*no pg_hba.conf entry for host.+$
  56               ^<HOST>\s+FATAL:\s*no PostgreSQL user name specified in startup packet.+$
  57               ^<HOST>\s+FATAL:\s*password authentication failed for user.+$
  58               ^<HOST>\s+FATAL:\s*unsupported frontend protocol.+$
  59   maxlines = 1
  60   #ignoreregex = duration:
  61 '';
  62 }