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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
*/
var wsh = new ActiveXObject("WScript.Shell");
var shl = new ActiveXObject("Shell.Application");
var fso = new ActiveXObject("Scripting.FileSystemObject");
function logMessage(msg) {
var record = Installer.CreateRecord(1);
record.StringData(0) = "Custom action: [1]";
record.StringData(1) = msg.toString();
Session.Message(0x04000000, record);
}
// I'd rather use wsh.Exec, so that we can just do ".Stdout.ReadAll()", but
// this results in a scary flashing command window. The below is the best
// workaround we can find yet. We'll keep searching for more clever tricks.
function runWithNoWindowFlash(command) {
//TODO: Seems pretty unlikely that this temp file is secure...
var tmpfile = fso.BuildPath(fso.GetSpecialFolder(2), fso.GetTempName());
try {
//TODO: Obviously cmd and tmpfile are unescaped here...
var cmd = fso.BuildPath(fso.GetSpecialFolder(1), "cmd.exe") + " /c " + command + " > \"" + tmpfile + "\"";
var ret = wsh.Run(cmd, 0, true);
if (ret != 0) {
logMessage("Command " + cmd + " exited with error " + ret.toString());
return "";
}
var txt;
try {
var file = fso.OpenTextFile(tmpfile, 1);
txt = file.ReadAll();
file.Close();
} catch (e) {
logMessage("Unable to read temporary file " + tmpfile + " for command " + cmd + ": " + e.message);
return "";
}
return txt;
} finally {
try {
fso.DeleteFile(tmpfile);
} catch (e) {}
}
}
function EvaluateWireGuardServices() {
var inst = Session.Installer;
var db = Session.Database;
var view = db.OpenView("INSERT INTO `ServiceControl` (`ServiceControl`, `Name`, `Event`, `Component_`, `Wait`) VALUES(?, ?, ?, ?, ?) TEMPORARY");
var rec = inst.CreateRecord(5);
var serviceKey = "HKEY_LOCAL_MACHINE\\System\\CurrentControlSet\\Services";
var servicePrefix = "WireGuardTunnel$";
var serviceKeyPrefix = serviceKey + "\\" + servicePrefix;
var allowedNameFormat = new RegExp("^[a-zA-Z0-9_=+.-]{1,32}$");
var msiOperators = new RegExp("[=+-]", "g");
var index = 0;
function insertServiceControl(serviceName) {
logMessage("Scheduling stop on upgrade or removal on uninstall of service " + serviceName);
rec.StringData (1/*ServiceControl*/) = "stop_" + serviceName.replace(msiOperators, "_") + (index++).toString();
rec.StringData (2/*Name */) = serviceName;
rec.IntegerData(3/*Event */) = 0x2/*msidbServiceControlEventStop*/ | 0x20/*msidbServiceControlEventUninstallStop*/ | 0x80/*msidbServiceControlEventUninstallDelete*/;
rec.StringData (4/*Component_ */) = "WireGuardExecutable";
rec.IntegerData(5/*Wait */) = 1; /* Waits 30 seconds. */
view.Execute(rec);
if (!shl.IsServiceRunning(serviceName))
return;
logMessage("Scheduling start on upgrade of service " + serviceName);
rec.StringData (1/*ServiceControl*/) = "start_" + serviceName.replace(msiOperators, "_") + (index++).toString();
rec.StringData (2/*Name */) = serviceName;
rec.IntegerData(3/*Event */) = 0x1/*msidbServiceControlEventStart*/;
rec.StringData (4/*Component_ */) = "WireGuardExecutable";
rec.IntegerData(5/*Wait */) = 0; /* No wait, so that failure to restart again isn't fatal. */
view.Execute(rec);
}
insertServiceControl("WireGuardManager");
var txt = runWithNoWindowFlash(fso.BuildPath(fso.GetSpecialFolder(1), "reg.exe") + " query \"" + serviceKey + "\"");
var lines = txt.split(new RegExp("\r?\n", "g"));
for (var i = 0; i < lines.length; ++i) {
if (lines[i].length > serviceKeyPrefix.length && lines[i].substring(0, serviceKeyPrefix.length) == serviceKeyPrefix) {
var tunnelName = lines[i].substring(serviceKeyPrefix.length);
if (tunnelName.match(allowedNameFormat) != null)
insertServiceControl(servicePrefix + tunnelName);
}
}
}
function RemoveConfigFolder() {
try {
var path = wsh.RegRead("HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\ProfileList\\S-1-5-18\\ProfileImagePath");
path = wsh.ExpandEnvironmentStrings(path.toString());
fso.DeleteFolder(fso.BuildPath(path, "AppData\\Local\\WireGuard"), true);
} catch(e) {
logMessage("Failed to remove configuration on uninstall: " + e.message);
}
}
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