eefafb54ef
Before:
$ ps aux | grep upterm
root 2575046 0.0 0.0 1085080 6968 ? Ssl 07:03 0:00 /nix/store/ci97r1lqx4128w75k7dcsw82j5bl0n3g-upterm-0.8.2/bin/uptermd --ssh-addr [::]:2323 --private-key ssh_host_ed25519_key
After
$ ps aux | grep upterm
uptermd 2832993 0.4 0.0 1158812 6856 ? Ssl 07:08 0:00 /nix/store/ci97r1lqx4128w75k7dcsw82j5bl0n3g-upterm-0.8.2/bin/uptermd --ssh-addr [::]:2323 --private-key ssh_host_ed25519_key
110 lines
3.0 KiB
Nix
110 lines
3.0 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.uptermd;
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in
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{
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options = {
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services.uptermd = {
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enable = mkEnableOption "uptermd";
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openFirewall = 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 open the firewall for the port in <option>services.uptermd.port</option>.
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'';
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};
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port = mkOption {
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type = types.port;
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default = 2222;
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description = ''
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Port the server will listen on.
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'';
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};
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listenAddress = mkOption {
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type = types.str;
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default = "[::]";
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example = "127.0.0.1";
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description = ''
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Address the server will listen on.
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'';
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};
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hostKey = mkOption {
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type = types.nullOr types.path;
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default = null;
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example = "/run/keys/upterm_host_ed25519_key";
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description = ''
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Path to SSH host key. If not defined, an ed25519 keypair is generated automatically.
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'';
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};
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extraFlags = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "--debug" ];
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description = ''
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Extra flags passed to the uptermd command.
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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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networking.firewall = mkIf cfg.openFirewall {
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allowedTCPPorts = [ cfg.port ];
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};
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systemd.services.uptermd = {
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description = "Upterm Daemon";
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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path = [ pkgs.openssh ];
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preStart = mkIf (cfg.hostKey == null) ''
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if ! [ -f ssh_host_ed25519_key ]; then
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ssh-keygen \
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-t ed25519 \
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-f ssh_host_ed25519_key \
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-N ""
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fi
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'';
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serviceConfig = {
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StateDirectory = "uptermd";
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WorkingDirectory = "/var/lib/uptermd";
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ExecStart = "${pkgs.upterm}/bin/uptermd --ssh-addr ${cfg.listenAddress}:${toString cfg.port} --private-key ${if cfg.hostKey == null then "ssh_host_ed25519_key" else cfg.hostKey} ${concatStringsSep " " cfg.extraFlags}";
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# Hardening
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AmbientCapabilities = mkIf (cfg.port < 1024) [ "CAP_NET_BIND_SERVICE" ];
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CapabilityBoundingSet = mkIf (cfg.port < 1024) [ "CAP_NET_BIND_SERVICE" ];
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PrivateUsers = cfg.port >= 1024;
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DynamicUser = true;
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LockPersonality = true;
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MemoryDenyWriteExecute = true;
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PrivateDevices = true;
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ProtectClock = true;
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ProtectControlGroups = true;
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ProtectHome = true;
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ProtectHostname = true;
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ProtectKernelLogs = true;
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ProtectKernelModules = true;
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ProtectKernelTunables = true;
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ProtectProc = "invisible";
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# AF_UNIX is for ssh-keygen, which relies on nscd to resolve the uid to a user
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RestrictAddressFamilies = [ "AF_INET" "AF_INET6" "AF_UNIX" ];
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RestrictNamespaces = true;
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RestrictRealtime = true;
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SystemCallArchitectures = "native";
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SystemCallFilter = "@system-service";
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};
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};
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};
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}
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