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|
{
config,
lib,
...
}: let
cfg = config.vhack.fail2ban;
in {
options.vhack.fail2ban = {
enable = lib.mkEnableOption "fail2ban";
};
config = lib.mkIf cfg.enable {
vhack.persist.directories = [
{
directory = "/var/lib/fail2ban";
# TODO: Fail2ban should probably run under a dedicated `fail2ban` user. <2024-12-25>
user = "root";
group = "root";
mode = "0700";
}
];
services.fail2ban = {
enable = true;
maxretry = 7; # ban after 7 failures
daemonSettings = {
Definition = {
logtarget = "SYSLOG";
socket = "/run/fail2ban/fail2ban.sock";
pidfile = "/run/fail2ban/fail2ban.pid";
dbfile = "/var/lib/fail2ban/db.sqlite3";
};
};
bantime-increment = {
enable = true;
rndtime = "8m";
overalljails = true;
multipliers = "2 4 16 128 256";
maxtime = "72h";
};
jails = {
dovecot = ''
# block IPs which failed to log-in
# aggressive mode add blocking for aborted connections
enabled = true
filter = dovecot[mode=aggressive]
maxretry = 2
'';
postfix = ''
enabled = true
filter = postfix[mode=aggressive]
findtime = 600
maxretry = 3
'';
};
};
};
}
|
