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nixos/fail2ban: clean-up configuration

This commit is contained in:
Izorkin 2019-09-02 12:14:58 +03:00
parent 15b0ae6156
commit 68d601d65c
1 changed files with 96 additions and 76 deletions
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172
nixos/modules/services/security/fail2ban.nix
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@ -6,15 +6,32 @@ let
cfg = config.services.fail2ban; cfg = config.services.fail2ban;
fail2banConf = pkgs.writeText "fail2ban.conf" cfg.daemonConfig; fail2banConf = pkgs.writeText "fail2ban.local" cfg.daemonConfig;
jailConf = pkgs.writeText "jail.conf" jailConf = pkgs.writeText "jail.local" ''
(concatStringsSep "\n" (attrValues (flip mapAttrs cfg.jails (name: def: [INCLUDES]
before = paths-nixos.conf
${concatStringsSep "\n" (attrValues (flip mapAttrs cfg.jails (name: def:
optionalString (def != "") optionalString (def != "")
'' ''
[${name}] [${name}]
${def} ${def}
'')))); '')))}
'';
pathsConf = pkgs.writeText "paths-nixos.conf" ''
# NixOS
[INCLUDES]
before = paths-common.conf
after = paths-overrides.local
[DEFAULT]
'';
in in
@ -31,21 +48,26 @@ in
description = "Whether to enable the fail2ban service."; description = "Whether to enable the fail2ban service.";
}; };
package = mkOption {
default = pkgs.fail2ban;
type = types.package;
example = "pkgs.fail2ban_0_11";
description = "The fail2ban package to use for running the fail2ban service.";
};
daemonConfig = mkOption { daemonConfig = mkOption {
default = default = ''
'' [Definition]
[Definition] logtarget = SYSLOG
loglevel = INFO socket = /run/fail2ban/fail2ban.sock
logtarget = SYSLOG pidfile = /run/fail2ban/fail2ban.pid
socket = /run/fail2ban/fail2ban.sock dbfile = /var/lib/fail2ban/fail2ban.sqlite3
pidfile = /run/fail2ban/fail2ban.pid '';
'';
type = types.lines; type = types.lines;
description = description = ''
'' The contents of Fail2ban's main configuration file. It's
The contents of Fail2ban's main configuration file. It's generally not necessary to change it.
generally not necessary to change it. '';
'';
}; };
jails = mkOption { jails = mkOption {
@ -65,17 +87,16 @@ in
} }
''; '';
type = types.attrsOf types.lines; type = types.attrsOf types.lines;
description = description = ''
'' The configuration of each Fail2ban “jail”. A jail
The configuration of each Fail2ban “jail”. A jail consists of an action (such as blocking a port using
consists of an action (such as blocking a port using <command>iptables</command>) that is triggered when a
<command>iptables</command>) that is triggered when a filter applied to a log file triggers more than a certain
filter applied to a log file triggers more than a certain number of times in a certain time period. Actions are
number of times in a certain time period. Actions are defined in <filename>/etc/fail2ban/action.d</filename>,
defined in <filename>/etc/fail2ban/action.d</filename>, while filters are defined in
while filters are defined in <filename>/etc/fail2ban/filter.d</filename>.
<filename>/etc/fail2ban/filter.d</filename>. '';
'';
}; };
}; };
@ -87,66 +108,65 @@ in
config = mkIf cfg.enable { config = mkIf cfg.enable {
environment.systemPackages = [ pkgs.fail2ban ]; environment.systemPackages = [ cfg.package ];
environment.etc."fail2ban/fail2ban.conf".source = fail2banConf; environment.etc = {
environment.etc."fail2ban/jail.conf".source = jailConf; "fail2ban/fail2ban.local".source = fail2banConf;
environment.etc."fail2ban/action.d".source = "${pkgs.fail2ban}/etc/fail2ban/action.d/*.conf"; "fail2ban/jail.local".source = jailConf;
environment.etc."fail2ban/filter.d".source = "${pkgs.fail2ban}/etc/fail2ban/filter.d/*.conf"; "fail2ban/fail2ban.conf".source = "${cfg.package}/etc/fail2ban/fail2ban.conf";
"fail2ban/jail.conf".source = "${cfg.package}/etc/fail2ban/jail.conf";
"fail2ban/paths-common.conf".source = "${cfg.package}/etc/fail2ban/paths-common.conf";
"fail2ban/paths-nixos.conf".source = pathsConf;
"fail2ban/action.d".source = "${cfg.package}/etc/fail2ban/action.d/*.conf";
"fail2ban/filter.d".source = "${cfg.package}/etc/fail2ban/filter.d/*.conf";
};
systemd.services.fail2ban = systemd.services.fail2ban = {
{ description = "Fail2ban Intrusion Prevention System"; description = "Fail2ban Intrusion Prevention System";
wantedBy = [ "multi-user.target" ]; wantedBy = [ "multi-user.target" ];
after = [ "network.target" ]; after = [ "network.target" ];
partOf = optional config.networking.firewall.enable "firewall.service"; partOf = optional config.networking.firewall.enable "firewall.service";
restartTriggers = [ fail2banConf jailConf ]; restartTriggers = [ fail2banConf jailConf pathsConf ];
path = [ pkgs.fail2ban pkgs.iptables pkgs.iproute ]; reloadIfChanged = true;
preStart = path = [ cfg.package pkgs.iptables pkgs.iproute ];
''
mkdir -p /var/lib/fail2ban
'';
unitConfig.Documentation = "man:fail2ban(1)"; preStart = ''
mkdir -p /var/lib/fail2ban
'';
serviceConfig = unitConfig.Documentation = "man:fail2ban(1)";
{ Type = "forking";
ExecStart = "${pkgs.fail2ban}/bin/fail2ban-client -x start";
ExecStop = "${pkgs.fail2ban}/bin/fail2ban-client stop";
ExecReload = "${pkgs.fail2ban}/bin/fail2ban-client reload";
PIDFile = "/run/fail2ban/fail2ban.pid";
Restart = "always";
ReadOnlyDirectories = "/"; serviceConfig = {
ReadWriteDirectories = "/run/fail2ban /var/tmp /var/lib"; Type = "forking";
PrivateTmp = "true"; ExecStart = "${cfg.package}/bin/fail2ban-server -xf start";
RuntimeDirectory = "fail2ban"; ExecStop = "${cfg.package}/bin/fail2ban-server stop";
CapabilityBoundingSet = "CAP_DAC_READ_SEARCH CAP_NET_ADMIN CAP_NET_RAW"; ExecReload = "${cfg.package}/bin/fail2ban-server reload";
}; PIDFile = "/run/fail2ban/fail2ban.pid";
Restart = "always";
ReadOnlyDirectories = "/";
ReadWriteDirectories = "/run/fail2ban /var/tmp /var/lib";
PrivateTmp = "true";
RuntimeDirectory = "fail2ban";
CapabilityBoundingSet = "CAP_DAC_READ_SEARCH CAP_NET_ADMIN CAP_NET_RAW";
}; };
};
# Add some reasonable default jails. The special "DEFAULT" jail # Add some reasonable default jails. The special "DEFAULT" jail
# sets default values for all other jails. # sets default values for all other jails.
services.fail2ban.jails.DEFAULT = services.fail2ban.jails.DEFAULT = ''
'' # Miscellaneous options
ignoreip = 127.0.0.1/8 ignoreip = 127.0.0.1/8 ${optionalString config.networking.enableIPv6 "::1"}
bantime = 600 maxretry = 3
findtime = 600 backend = systemd
maxretry = 3 '';
backend = systemd
enabled = true
'';
# Block SSH if there are too many failing connection attempts. # Block SSH if there are too many failing connection attempts.
services.fail2ban.jails.ssh-iptables = services.fail2ban.jails.sshd = mkDefault ''
'' enabled = true
filter = sshd port = ${concatMapStringsSep "," (p: toString p) config.services.openssh.ports}
action = iptables-multiport[name=SSH, port="${concatMapStringsSep "," (p: toString p) config.services.openssh.ports}", protocol=tcp] '';
maxretry = 5
'';
}; };
} }