forked from mirrors/nixpkgs
c784d3ab76
Refactor the systemd service definition for the haproxy reverse proxy, using the upstream systemd service definition. This allows the service to be reloaded on changes, preserving existing server state, and adds some hardening options.
113 lines
3.2 KiB
Nix
113 lines
3.2 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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cfg = config.services.haproxy;
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haproxyCfg = pkgs.writeText "haproxy.conf" ''
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global
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# needed for hot-reload to work without dropping packets in multi-worker mode
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stats socket /run/haproxy/haproxy.sock mode 600 expose-fd listeners level user
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${cfg.config}
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'';
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in
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with lib;
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{
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options = {
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services.haproxy = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable HAProxy, the reliable, high performance TCP/HTTP
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load balancer.
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'';
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};
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user = mkOption {
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type = types.str;
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default = "haproxy";
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description = "User account under which haproxy runs.";
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};
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group = mkOption {
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type = types.str;
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default = "haproxy";
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description = "Group account under which haproxy runs.";
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};
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config = mkOption {
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type = types.nullOr types.lines;
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default = null;
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description = ''
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Contents of the HAProxy configuration file,
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<filename>haproxy.conf</filename>.
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'';
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};
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};
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};
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config = mkIf cfg.enable {
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assertions = [{
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assertion = cfg.config != null;
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message = "You must provide services.haproxy.config.";
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}];
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# configuration file indirection is needed to support reloading
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environment.etc."haproxy.cfg".source = haproxyCfg;
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systemd.services.haproxy = {
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description = "HAProxy";
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after = [ "network.target" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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User = cfg.user;
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Group = cfg.group;
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Type = "notify";
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ExecStartPre = [
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# when the master process receives USR2, it reloads itself using exec(argv[0]),
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# so we create a symlink there and update it before reloading
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"${pkgs.coreutils}/bin/ln -sf ${pkgs.haproxy}/sbin/haproxy /run/haproxy/haproxy"
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# when running the config test, don't be quiet so we can see what goes wrong
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"/run/haproxy/haproxy -c -f ${haproxyCfg}"
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];
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ExecStart = "/run/haproxy/haproxy -Ws -f /etc/haproxy.cfg -p /run/haproxy/haproxy.pid";
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# support reloading
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ExecReload = [
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"${pkgs.haproxy}/sbin/haproxy -c -f ${haproxyCfg}"
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"${pkgs.coreutils}/bin/ln -sf ${pkgs.haproxy}/sbin/haproxy /run/haproxy/haproxy"
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"${pkgs.coreutils}/bin/kill -USR2 $MAINPID"
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];
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KillMode = "mixed";
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SuccessExitStatus = "143";
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Restart = "always";
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RuntimeDirectory = "haproxy";
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# upstream hardening options
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NoNewPrivileges = true;
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ProtectHome = true;
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ProtectSystem = "strict";
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ProtectKernelTunables = true;
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ProtectKernelModules = true;
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ProtectControlGroups = true;
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SystemCallFilter= "~@cpu-emulation @keyring @module @obsolete @raw-io @reboot @swap @sync";
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# needed in case we bind to port < 1024
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AmbientCapabilities = "CAP_NET_BIND_SERVICE";
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};
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};
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users.users = optionalAttrs (cfg.user == "haproxy") {
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haproxy = {
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group = cfg.group;
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isSystemUser = true;
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};
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};
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users.groups = optionalAttrs (cfg.group == "haproxy") {
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haproxy = {};
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};
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};
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}
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