nixpkgs/nixos/modules/services/networking/xrdp.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.xrdp;
confDir = pkgs.runCommand "xrdp.conf" { } ''
mkdir $out
cp ${cfg.package}/etc/xrdp/{km-*,xrdp,sesman,xrdp_keyboard}.ini $out
cat > $out/startwm.sh <<EOF
#!/bin/sh
. /etc/profile
${cfg.defaultWindowManager}
EOF
chmod +x $out/startwm.sh
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substituteInPlace $out/xrdp.ini \
--replace "#rsakeys_ini=" "rsakeys_ini=/var/run/xrdp/rsakeys.ini" \
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--replace "certificate=" "certificate=${cfg.sslCert}" \
--replace "key_file=" "key_file=${cfg.sslKey}" \
--replace LogFile=xrdp.log LogFile=/dev/null \
--replace EnableSyslog=true EnableSyslog=false
substituteInPlace $out/sesman.ini \
--replace LogFile=xrdp-sesman.log LogFile=/dev/null \
--replace EnableSyslog=1 EnableSyslog=0
'';
in
{
###### interface
options = {
services.xrdp = {
enable = mkEnableOption "Whether xrdp should be run on startup.";
package = mkOption {
type = types.package;
default = pkgs.xrdp;
defaultText = "pkgs.xrdp";
description = ''
The package to use for the xrdp daemon's binary.
'';
};
port = mkOption {
type = types.int;
default = 3389;
description = ''
Specifies on which port the xrdp daemon listens.
'';
};
sslKey = mkOption {
type = types.str;
default = "/etc/xrdp/key.pem";
example = "/path/to/your/key.pem";
description = ''
ssl private key path
A self-signed certificate will be generated if file not exists.
'';
};
sslCert = mkOption {
type = types.str;
default = "/etc/xrdp/cert.pem";
example = "/path/to/your/cert.pem";
description = ''
ssl certificate path
A self-signed certificate will be generated if file not exists.
'';
};
defaultWindowManager = mkOption {
type = types.str;
default = "xterm";
example = "xfce4-session";
description = ''
The script to run when user log in, usually a window manager, e.g. "icewm", "xfce4-session"
This is per-user overridable, if file ~/startwm.sh exists it will be used instead.
'';
};
};
};
###### implementation
config = mkIf cfg.enable {
# copied from <nixos/modules/services/x11/xserver.nix>
# xrdp can run X11 program even if "services.xserver.enable = false"
environment.pathsToLink =
[ "/etc/xdg" "/share/xdg" "/share/applications" "/share/icons" "/share/pixmaps" ];
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systemd = {
services.xrdp = {
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
description = "xrdp daemon";
requires = [ "xrdp-sesman.service" ];
preStart = ''
# prepare directory for unix sockets (the sockets will be owned by loggedinuser:xrdp)
mkdir -p /tmp/.xrdp || true
chown xrdp:xrdp /tmp/.xrdp
chmod 3777 /tmp/.xrdp
# generate a self-signed certificate
if [ ! -s ${cfg.sslCert} -o ! -s ${cfg.sslKey} ]; then
mkdir -p $(dirname ${cfg.sslCert}) || true
mkdir -p $(dirname ${cfg.sslKey}) || true
${pkgs.openssl.bin}/bin/openssl req -x509 -newkey rsa:2048 -sha256 -nodes -days 365 \
-subj /C=US/ST=CA/L=Sunnyvale/O=xrdp/CN=www.xrdp.org \
-config ${cfg.package}/share/xrdp/openssl.conf \
-keyout ${cfg.sslKey} -out ${cfg.sslCert}
chown root:xrdp ${cfg.sslKey} ${cfg.sslCert}
chmod 440 ${cfg.sslKey} ${cfg.sslCert}
fi
if [ ! -s /var/run/xrdp/rsakeys.ini ]; then
mkdir -p /var/run/xrdp
${cfg.package}/bin/xrdp-keygen xrdp /var/run/xrdp/rsakeys.ini
fi
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'';
serviceConfig = {
User = "xrdp";
Group = "xrdp";
PermissionsStartOnly = true;
ExecStart = "${cfg.package}/bin/xrdp --nodaemon --port ${toString cfg.port} --config ${confDir}/xrdp.ini";
};
};
services.xrdp-sesman = {
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
description = "xrdp session manager";
restartIfChanged = false; # do not restart on "nixos-rebuild switch". like "display-manager", it can have many interactive programs as children
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serviceConfig = {
ExecStart = "${cfg.package}/bin/xrdp-sesman --nodaemon --config ${confDir}/sesman.ini";
ExecStop = "${pkgs.coreutils}/bin/kill -INT $MAINPID";
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};
};
};
users.users.xrdp = {
description = "xrdp daemon user";
isSystemUser = true;
group = "xrdp";
};
users.groups.xrdp = {};
security.pam.services.xrdp-sesman = { allowNullPassword = true; startSession = true; };
};
}