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123 lines
3.7 KiB
Nix
123 lines
3.7 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.shellinabox;
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# If a certificate file is specified, shellinaboxd requires
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# a file descriptor to retrieve it
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fd = "3";
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createFd = optionalString (cfg.certFile != null) "${fd}<${cfg.certFile}";
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# Command line arguments for the shellinabox daemon
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args = [ "--background" ]
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++ optional (! cfg.enableSSL) "--disable-ssl"
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++ optional (cfg.certFile != null) "--cert-fd=${fd}"
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++ optional (cfg.certDirectory != null) "--cert=${cfg.certDirectory}"
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++ cfg.extraOptions;
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# Command to start shellinaboxd
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cmd = "${pkgs.shellinabox}/bin/shellinaboxd ${concatStringsSep " " args}";
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# Command to start shellinaboxd if certFile is specified
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wrappedCmd = "${pkgs.bash}/bin/bash -c 'exec ${createFd} && ${cmd}'";
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in
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{
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###### interface
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options = {
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services.shellinabox = {
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enable = mkEnableOption "shellinabox daemon";
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user = mkOption {
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type = types.str;
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default = "root";
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description = ''
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User to run shellinaboxd as. If started as root, the server drops
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privileges by changing to nobody, unless overridden by the
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<literal>--user</literal> option.
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'';
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};
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enableSSL = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether or not to enable SSL (https) support.
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'';
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};
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certDirectory = mkOption {
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type = types.nullOr types.path;
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default = null;
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example = "/var/certs";
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description = ''
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The daemon will look in this directory far any certificates.
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If the browser negotiated a Server Name Identification the daemon
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will look for a matching certificate-SERVERNAME.pem file. If no SNI
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handshake takes place, it will fall back on using the certificate in the
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certificate.pem file.
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If no suitable certificate is installed, shellinaboxd will attempt to
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create a new self-signed certificate. This will only succeed if, after
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dropping privileges, shellinaboxd has write permissions for this
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directory.
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'';
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};
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certFile = mkOption {
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type = types.nullOr types.path;
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default = null;
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example = "/var/certificate.pem";
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description = "Path to server SSL certificate.";
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};
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extraOptions = mkOption {
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type = types.listOf types.str;
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default = [ ];
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example = [ "--port=443" "--service /:LOGIN" ];
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description = ''
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A list of strings to be appended to the command line arguments
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for shellinaboxd. Please see the manual page
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<link xlink:href="https://code.google.com/p/shellinabox/wiki/shellinaboxd_man"/>
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for a full list of available arguments.
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'';
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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assertions =
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[ { assertion = cfg.enableSSL == true
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-> cfg.certDirectory != null || cfg.certFile != null;
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message = "SSL is enabled for shellinabox, but no certDirectory or certFile has been specefied."; }
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{ assertion = ! (cfg.certDirectory != null && cfg.certFile != null);
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message = "Cannot set both certDirectory and certFile for shellinabox."; }
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];
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systemd.services.shellinaboxd = {
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description = "Shellinabox Web Server Daemon";
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wantedBy = [ "multi-user.target" ];
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requires = [ "sshd.service" ];
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after = [ "sshd.service" ];
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serviceConfig = {
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Type = "forking";
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User = "${cfg.user}";
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ExecStart = "${if cfg.certFile == null then "${cmd}" else "${wrappedCmd}"}";
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ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
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};
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};
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};
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}
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