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using Microsoft.Win32.TaskScheduler;
using PKISharp.WACS.Configuration;
using PKISharp.WACS.Extensions;
using System;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
namespace PKISharp.WACS.Services
{
internal class TaskSchedulerService
{
private readonly MainArguments _arguments;
private readonly ISettingsService _settings;
private readonly IInputService _input;
private readonly ILogService _log;
public TaskSchedulerService(
ISettingsService settings,
IArgumentsService arguments,
IInputService input,
ILogService log)
{
_arguments = arguments.MainArguments;
_settings = settings;
_input = input;
_log = log;
}
private string TaskName(string clientName) => $"{clientName} renew ({_settings.BaseUri.CleanUri()})";
private string WorkingDirectory => Path.GetDirectoryName(_settings.ExePath);
private string ExecutingFile => Path.GetFileName(_settings.ExePath);
private Task? ExistingTask
{
get
{
using (var taskService = new TaskService())
{
var taskName = TaskName(_settings.Client.ClientName);
var existingTask = taskService.GetTask(taskName);
if (existingTask != null)
{
return existingTask;
}
}
return null;
}
}
public bool ConfirmTaskScheduler()
{
var existingTask = ExistingTask;
if (existingTask != null)
{
return IsHealthy(existingTask);
}
else
{
_log.Warning("Scheduled task not configured yet");
return false;
}
}
private bool IsHealthy(Task task)
{
var healthy = true;
if (!task.Definition.Actions.OfType<ExecAction>().Any(action =>
string.Equals(action.Path, _settings.ExePath, StringComparison.OrdinalIgnoreCase) &&
string.Equals(action.WorkingDirectory, WorkingDirectory, StringComparison.OrdinalIgnoreCase)))
{
healthy = false;
_log.Warning("Scheduled task points to different location for .exe and/or working directory");
}
if (!task.Enabled)
{
healthy = false;
_log.Warning("Scheduled task is disabled");
}
if (healthy)
{
_log.Information("Scheduled task looks healthy");
return true;
}
else
{
_log.Warning("Scheduled task exists but does not look healthy");
return false;
}
}
public async System.Threading.Tasks.Task EnsureTaskScheduler(RunLevel runLevel, bool offerRecreate)
{
string taskName;
var existingTask = ExistingTask;
taskName = existingTask != null ?
existingTask.Name :
TaskName(_settings.Client.ClientName);
using var taskService = new TaskService();
if (existingTask != null)
{
var healthy = IsHealthy(existingTask);
var recreate = false;
if (runLevel.HasFlag(RunLevel.Interactive))
{
if (offerRecreate || !healthy)
{
recreate = await _input.PromptYesNo($"Do you want to replace the existing task?", false);
}
}
if (!recreate)
{
if (!healthy)
{
_log.Error("Proceeding with unhealthy scheduled task, automatic renewals may not work until this is addressed");
}
return;
}
_log.Information("Deleting existing task {taskName} from Windows Task Scheduler.", taskName);
taskService.RootFolder.DeleteTask(taskName, false);
}
var actionString = $"--{nameof(MainArguments.Renew).ToLowerInvariant()} --{nameof(MainArguments.BaseUri).ToLowerInvariant()} \"{_settings.BaseUri}\"";
_log.Information("Adding Task Scheduler entry with the following settings", taskName);
_log.Information("- Name {name}", taskName);
_log.Information("- Path {action}", WorkingDirectory);
_log.Information("- Command {exec} {action}", ExecutingFile, actionString);
_log.Information("- Start at {start}", _settings.ScheduledTask.StartBoundary);
if (_settings.ScheduledTask.RandomDelay.TotalMinutes > 0)
{
_log.Information("- Random delay {delay}", _settings.ScheduledTask.RandomDelay);
}
_log.Information("- Time limit {limit}", _settings.ScheduledTask.ExecutionTimeLimit);
// Create a new task definition and assign properties
var task = taskService.NewTask();
task.RegistrationInfo.Description = "Check for renewal of ACME certificates.";
var now = DateTime.Now;
var runtime = new DateTime(now.Year, now.Month, now.Day,
_settings.ScheduledTask.StartBoundary.Hours,
_settings.ScheduledTask.StartBoundary.Minutes,
_settings.ScheduledTask.StartBoundary.Seconds);
task.Triggers.Add(new DailyTrigger
{
DaysInterval = 1,
StartBoundary = runtime,
RandomDelay = _settings.ScheduledTask.RandomDelay
});
task.Settings.ExecutionTimeLimit = _settings.ScheduledTask.ExecutionTimeLimit;
task.Settings.MultipleInstances = TaskInstancesPolicy.IgnoreNew;
task.Settings.RunOnlyIfNetworkAvailable = true;
task.Settings.DisallowStartIfOnBatteries = false;
task.Settings.StopIfGoingOnBatteries = false;
task.Settings.StartWhenAvailable = true;
// Create an action that will launch the app with the renew parameters whenever the trigger fires
task.Actions.Add(new ExecAction(_settings.ExePath, actionString, WorkingDirectory));
task.Principal.RunLevel = TaskRunLevel.Highest;
while (true)
{
try
{
if (!_arguments.UseDefaultTaskUser &&
runLevel.HasFlag(RunLevel.Interactive | RunLevel.Advanced) &&
await _input.PromptYesNo($"Do you want to specify the user the task will run as?", false))
{
// Ask for the login and password to allow the task to run
var username = await _input.RequestString("Enter the username (Domain\\username)");
var password = await _input.ReadPassword("Enter the user's password");
_log.Debug("Creating task to run as {username}", username);
try
{
taskService.RootFolder.RegisterTaskDefinition(
taskName,
task,
TaskCreation.Create,
username,
password,
TaskLogonType.Password);
}
catch (UnauthorizedAccessException)
{
_log.Error("Unable to register scheduled task, please run as administrator or equivalent");
}
}
else if (existingTask != null)
{
_log.Debug("Creating task to run with previously chosen credentials");
string? password = null;
string? username = null;
if (existingTask.Definition.Principal.LogonType == TaskLogonType.Password)
{
username = existingTask.Definition.Principal.UserId;
password = await _input.ReadPassword($"Password for {username}");
}
task.Principal.UserId = existingTask.Definition.Principal.UserId;
task.Principal.LogonType = existingTask.Definition.Principal.LogonType;
try
{
taskService.RootFolder.RegisterTaskDefinition(
taskName,
task,
TaskCreation.CreateOrUpdate,
username,
password,
existingTask.Definition.Principal.LogonType);
}
catch (UnauthorizedAccessException)
{
_log.Error("Unable to register scheduled task, please run as administrator or equivalent");
}
}
else
{
_log.Debug("Creating task to run as system user");
task.Principal.UserId = "SYSTEM";
task.Principal.LogonType = TaskLogonType.ServiceAccount;
try
{
taskService.RootFolder.RegisterTaskDefinition(
taskName,
task,
TaskCreation.CreateOrUpdate,
null,
null,
TaskLogonType.ServiceAccount);
}
catch (UnauthorizedAccessException)
{
_log.Error("Unable to register scheduled task, please run as administrator or equivalent");
}
}
break;
}
catch (COMException cex)
{
if (cex.HResult == -2147023570)
{
_log.Warning("Invalid username/password, please try again");
}
else
{
_log.Error(cex, "Failed to create task");
break;
}
}
catch (Exception ex)
{
_log.Error(ex, "Failed to create task");
break;
}
}
}
}
}
|
