AnonSec Shell

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    name: powershell
    plugin_type: shell
    version_added: ""
    short_description: Windows Powershell
    description:
      - The only option when using 'winrm' as a connection plugin
    options:
      remote_tmp:
        description:
        - Temporary directory to use on targets when copying files to the host.
        default: '%TEMP%'
        ini:
        - section: powershell
          key: remote_tmp
        vars:
        - name: ansible_remote_tmp
      set_module_language:
        description:
        - Controls if we set the locale for moduels when executing on the
          target.
        - Windows only supports C(no) as an option.
        type: bool
        default: 'no'
        choices:
        - 'no'
      environment:
        description:
        - Dictionary of environment variables and their values to use when
          executing commands.
        type: dict
        default: {}
N(tAnsibleError(tto_text(t	ShellBaset
PowerShells
-NoProfiles-NonInteractives-ExecutionPolicytUnrestrictedtPOWERSHELL_VERSIONs-Versionis
begin {
    $DebugPreference = "Continue"
    $ErrorActionPreference = "Stop"
    Set-StrictMode -Version 2

    function ConvertTo-HashtableFromPsCustomObject ($myPsObject){
        $output = @{};
        $myPsObject | Get-Member -MemberType *Property | % {
            $val = $myPsObject.($_.name);
            If ($val -is [psobject]) {
                $val = ConvertTo-HashtableFromPsCustomObject $val
            }
            $output.($_.name) = $val
        }
        return $output;
    }
    # stream JSON including become_pw, ps_module_payload, bin_module_payload, become_payload, write_payload_path, preserve directives
    # exec runspace, capture output, cleanup, return module output

    # only init and stream in $json_raw if it wasn't set by the enclosing scope
    if (-not $(Get-Variable "json_raw" -ErrorAction SilentlyContinue)) {
        $json_raw = ''
    }
}
process {
    $input_as_string = [string]$input

    $json_raw += $input_as_string
}
end {
    If (-not $json_raw) {
        Write-Error "no input given" -Category InvalidArgument
    }
    $payload = ConvertTo-HashtableFromPsCustomObject (ConvertFrom-Json $json_raw)

    # TODO: handle binary modules
    # TODO: handle persistence

    $min_os_version = [version]$payload.min_os_version
    if ($min_os_version -ne $null) {
        $actual_os_version = [System.Environment]::OSVersion.Version
        if ($actual_os_version -lt $min_os_version) {
            $msg = "This module cannot run on this OS as it requires a minimum version of $min_os_version, actual was $actual_os_version"
            Write-Output (ConvertTo-Json @{failed=$true;msg=$msg})
            exit 1
        }
    }

    $min_ps_version = [version]$payload.min_ps_version
    if ($min_ps_version -ne $null) {
        $actual_ps_version = $PSVersionTable.PSVersion
        if ($actual_ps_version -lt $min_ps_version) {
            $msg = "This module cannot run as it requires a minimum PowerShell version of $min_ps_version, actual was $actual_ps_version"
            Write-Output (ConvertTo-Json @{failed=$true;msg=$msg})
            exit 1
        }
    }

    $actions = $payload.actions

    # pop 0th action as entrypoint
    $entrypoint = $payload.($actions[0])
    $payload.actions = $payload.actions[1..99]

    $entrypoint = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($entrypoint))

    # load the current action entrypoint as a module custom object with a Run method
    $entrypoint = New-Module -ScriptBlock ([scriptblock]::Create($entrypoint)) -AsCustomObject

    Set-Variable -Scope global -Name complex_args -Value $payload["module_args"] | Out-Null

    # dynamically create/load modules
    ForEach ($mod in $payload.powershell_modules.GetEnumerator()) {
        $decoded_module = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($mod.Value))
        New-Module -ScriptBlock ([scriptblock]::Create($decoded_module)) -Name $mod.Key | Import-Module -WarningAction SilentlyContinue | Out-Null
    }

    $output = $entrypoint.Run($payload)

    Write-Output $output
}

s

Function Run($payload) {
    $entrypoint = $payload.module_entry

    $entrypoint = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($entrypoint))

    $ps = [powershell]::Create()

    $ps.AddStatement().AddCommand("Set-Variable").AddParameters(@{Scope="global";Name="complex_args";Value=$payload.module_args}) | Out-Null
    $ps.AddCommand("Out-Null") | Out-Null

    # redefine Write-Host to dump to output instead of failing- lots of scripts use it
    $ps.AddStatement().AddScript("Function Write-Host(`$msg){ Write-Output `$msg }") | Out-Null

    ForEach ($env_kv in $payload.environment.GetEnumerator()) {
        # need to escape ' in both the key and value
        $env_key = $env_kv.Key.ToString().Replace("'", "''")
        $env_value = $env_kv.Value.ToString().Replace("'", "''")
        $escaped_env_set = "[System.Environment]::SetEnvironmentVariable('{0}', '{1}')" -f $env_key, $env_value
        $ps.AddStatement().AddScript($escaped_env_set) | Out-Null
    }

    # dynamically create/load modules
    ForEach ($mod in $payload.powershell_modules.GetEnumerator()) {
        $decoded_module = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($mod.Value))
        $ps.AddStatement().AddCommand("New-Module").AddParameters(@{ScriptBlock=([scriptblock]::Create($decoded_module));Name=$mod.Key}) | Out-Null
        $ps.AddCommand("Import-Module").AddParameters(@{WarningAction="SilentlyContinue"}) | Out-Null
        $ps.AddCommand("Out-Null") | Out-Null
    }

    # force input encoding to preamble-free UTF8 so PS sub-processes (eg,
    # Start-Job) don't blow up. This is only required for WinRM, a PSRP
    # runspace doesn't have a host console and this will bomb out
    if ($host.Name -eq "ConsoleHost") {
        $ps.AddStatement().AddScript("[Console]::InputEncoding = New-Object Text.UTF8Encoding `$false") | Out-Null
    }

    $ps.AddStatement().AddScript($entrypoint) | Out-Null

    $output = $ps.Invoke()

    $output

    # PS3 doesn't properly set HadErrors in many cases, inspect the error stream as a fallback
    If ($ps.HadErrors -or ($PSVersionTable.PSVersion.Major -lt 4 -and $ps.Streams.Error.Count -gt 0)) {
        $host.UI.WriteErrorLine($($ps.Streams.Error | Out-String))
        $exit_code = $ps.Runspace.SessionStateProxy.GetVariable("LASTEXITCODE")
        If(-not $exit_code) {
            $exit_code = 1
        }
        # need to use this instead of Exit keyword to prevent runspace from crashing with dynamic modules
        $host.SetShouldExit($exit_code)
    }
}
s�
Set-StrictMode -Version 2
$ErrorActionPreference = "Stop"

$helper_def = @"
using Microsoft.Win32.SafeHandles;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.ConstrainedExecution;
using System.Runtime.InteropServices;
using System.Security.AccessControl;
using System.Security.Principal;
using System.Text;
using System.Threading;

namespace AnsibleBecome
{
    [StructLayout(LayoutKind.Sequential)]
    public class SECURITY_ATTRIBUTES
    {
        public int nLength;
        public IntPtr lpSecurityDescriptor;
        public bool bInheritHandle = false;
        public SECURITY_ATTRIBUTES()
        {
            nLength = Marshal.SizeOf(this);
        }
    }

    [StructLayout(LayoutKind.Sequential)]
    public class STARTUPINFO
    {
        public Int32 cb;
        public IntPtr lpReserved;
        public IntPtr lpDesktop;
        public IntPtr lpTitle;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 28)]
        public byte[] _data1;
        public Int32 dwFlags;
        public Int16 wShowWindow;
        public Int16 cbReserved2;
        public IntPtr lpReserved2;
        public SafeFileHandle hStdInput;
        public SafeFileHandle hStdOutput;
        public SafeFileHandle hStdError;
        public STARTUPINFO()
        {
            cb = Marshal.SizeOf(this);
        }
    }

    [StructLayout(LayoutKind.Sequential)]
    public class STARTUPINFOEX
    {
        public STARTUPINFO startupInfo;
        public IntPtr lpAttributeList;
        public STARTUPINFOEX()
        {
            startupInfo = new STARTUPINFO();
            startupInfo.cb = Marshal.SizeOf(this);
        }
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct LUID
    {
        public UInt32 LowPart;
        public Int32 HighPart;

        public static explicit operator UInt64(LUID l)
        {
            return (UInt64)((UInt64)l.HighPart << 32) | (UInt64)l.LowPart;
        }
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct LUID_AND_ATTRIBUTES
    {
        public LUID Luid;
        public UInt32 Attributes;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct PROCESS_INFORMATION
    {
        public IntPtr hProcess;
        public IntPtr hThread;
        public int dwProcessId;
        public int dwThreadId;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct SID_AND_ATTRIBUTES
    {
        public IntPtr Sid;
        public int Attributes;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct TOKEN_PRIVILEGES
    {
        public UInt32 PrivilegeCount;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 1)]
        public LUID_AND_ATTRIBUTES[] Privileges;
    }

    public struct TOKEN_USER
    {
        public SID_AND_ATTRIBUTES User;
    }

    [Flags]
    public enum StartupInfoFlags : uint
    {
        USESTDHANDLES = 0x00000100
    }

    [Flags]
    public enum CreationFlags : uint
    {
        CREATE_BREAKAWAY_FROM_JOB = 0x01000000,
        CREATE_DEFAULT_ERROR_MODE = 0x04000000,
        CREATE_NEW_CONSOLE = 0x00000010,
        CREATE_SUSPENDED = 0x00000004,
        CREATE_UNICODE_ENVIRONMENT = 0x00000400,
        EXTENDED_STARTUPINFO_PRESENT = 0x00080000
    }

    public enum HandleFlags : uint
    {
        None = 0,
        INHERIT = 1
    }

    [Flags]
    public enum LogonFlags
    {
        LOGON_WITH_PROFILE = 0x00000001,
        LOGON_NETCREDENTIALS_ONLY = 0x00000002
    }

    public enum LogonType
    {
        LOGON32_LOGON_INTERACTIVE = 2,
        LOGON32_LOGON_NETWORK = 3,
        LOGON32_LOGON_BATCH = 4,
        LOGON32_LOGON_SERVICE = 5,
        LOGON32_LOGON_UNLOCK = 7,
        LOGON32_LOGON_NETWORK_CLEARTEXT = 8,
        LOGON32_LOGON_NEW_CREDENTIALS = 9
    }

    public enum LogonProvider
    {
        LOGON32_PROVIDER_DEFAULT = 0,
    }

    public enum TokenInformationClass
    {
        TokenUser = 1,
        TokenPrivileges = 3,
        TokenType = 8,
        TokenImpersonationLevel = 9,
        TokenElevationType = 18,
        TokenLinkedToken = 19,
    }

    public enum TokenElevationType
    {
        TokenElevationTypeDefault = 1,
        TokenElevationTypeFull,
        TokenElevationTypeLimited
    }

    [Flags]
    public enum ProcessAccessFlags : uint
    {
        PROCESS_QUERY_INFORMATION = 0x00000400,
    }

    public enum SECURITY_IMPERSONATION_LEVEL
    {
        SecurityImpersonation,
    }

    public enum TOKEN_TYPE
    {
        TokenPrimary = 1,
        TokenImpersonation
    }

    class NativeWaitHandle : WaitHandle
    {
        public NativeWaitHandle(IntPtr handle)
        {
            this.SafeWaitHandle = new SafeWaitHandle(handle, false);
        }
    }

    class SafeMemoryBuffer : SafeHandleZeroOrMinusOneIsInvalid
    {
        public SafeMemoryBuffer() : base(true) { }
        public SafeMemoryBuffer(int cb) : base(true)
        {
            base.SetHandle(Marshal.AllocHGlobal(cb));
        }
        public SafeMemoryBuffer(IntPtr handle) : base(true)
        {
            base.SetHandle(handle);
        }

        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
        protected override bool ReleaseHandle()
        {
            Marshal.FreeHGlobal(handle);
            return true;
        }
    }

    public class Win32Exception : System.ComponentModel.Win32Exception
    {
        private string _msg;
        public Win32Exception(string message) : this(Marshal.GetLastWin32Error(), message) { }
        public Win32Exception(int errorCode, string message) : base(errorCode)
        {
            _msg = String.Format("{0} ({1}, Win32ErrorCode {2})", message, base.Message, errorCode);
        }
        public override string Message { get { return _msg; } }
        public static explicit operator Win32Exception(string message) { return new Win32Exception(message); }
    }

    public class CommandResult
    {
        public string StandardOut { get; internal set; }
        public string StandardError { get; internal set; }
        public uint ExitCode { get; internal set; }
    }

    public class BecomeUtil
    {
        [DllImport("advapi32.dll", SetLastError = true)]
        private static extern bool LogonUser(
            string lpszUsername,
            string lpszDomain,
            string lpszPassword,
            LogonType dwLogonType,
            LogonProvider dwLogonProvider,
            out IntPtr phToken);

        [DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
        private static extern bool CreateProcessWithTokenW(
            IntPtr hToken,
            LogonFlags dwLogonFlags,
            [MarshalAs(UnmanagedType.LPTStr)]
            string lpApplicationName,
            StringBuilder lpCommandLine,
            CreationFlags dwCreationFlags,
            IntPtr lpEnvironment,
            [MarshalAs(UnmanagedType.LPTStr)]
            string lpCurrentDirectory,
            STARTUPINFOEX lpStartupInfo,
            out PROCESS_INFORMATION lpProcessInformation);

        [DllImport("kernel32.dll")]
        private static extern bool CreatePipe(
            out SafeFileHandle hReadPipe,
            out SafeFileHandle hWritePipe,
            SECURITY_ATTRIBUTES lpPipeAttributes,
            uint nSize);

        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern bool SetHandleInformation(
            SafeFileHandle hObject,
            HandleFlags dwMask,
            int dwFlags);

        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern bool GetExitCodeProcess(
            IntPtr hProcess,
            out uint lpExitCode);

        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern bool CloseHandle(
            IntPtr hObject);

        [DllImport("user32.dll", SetLastError = true)]
        private static extern IntPtr GetProcessWindowStation();

        [DllImport("user32.dll", SetLastError = true)]
        private static extern IntPtr GetThreadDesktop(
            int dwThreadId);

        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern int GetCurrentThreadId();

        [DllImport("advapi32.dll", SetLastError = true)]
        private static extern bool GetTokenInformation(
            IntPtr TokenHandle,
            TokenInformationClass TokenInformationClass,
            SafeMemoryBuffer TokenInformation,
            uint TokenInformationLength,
            out uint ReturnLength);

        [DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
        public static extern bool LookupPrivilegeNameW(
            string lpSystemName,
            ref LUID lpLuid,
            StringBuilder lpName,
            ref UInt32 cchName);

        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern IntPtr OpenProcess(
            ProcessAccessFlags processAccess,
            bool bInheritHandle,
            UInt32 processId);

        [DllImport("advapi32.dll", SetLastError = true)]
        private static extern bool OpenProcessToken(
            IntPtr ProcessHandle,
            TokenAccessLevels DesiredAccess,
            out IntPtr TokenHandle);

        [DllImport("advapi32", SetLastError = true)]
        private static extern bool DuplicateTokenEx(
            IntPtr hExistingToken,
            TokenAccessLevels dwDesiredAccess,
            IntPtr lpTokenAttributes,
            SECURITY_IMPERSONATION_LEVEL ImpersonationLevel,
            TOKEN_TYPE TokenType,
            out IntPtr phNewToken);

        [DllImport("advapi32.dll", SetLastError = true)]
        private static extern bool ImpersonateLoggedOnUser(
            IntPtr hToken);

        [DllImport("advapi32.dll", SetLastError = true)]
        private static extern bool RevertToSelf();

        public static CommandResult RunAsUser(string username, string password, string lpCommandLine,
            string lpCurrentDirectory, string stdinInput, LogonFlags logonFlags, LogonType logonType)
        {
            SecurityIdentifier account = null;
            if (logonType != LogonType.LOGON32_LOGON_NEW_CREDENTIALS)
            {
                account = GetBecomeSid(username);
            }

            STARTUPINFOEX si = new STARTUPINFOEX();
            si.startupInfo.dwFlags = (int)StartupInfoFlags.USESTDHANDLES;

            SECURITY_ATTRIBUTES pipesec = new SECURITY_ATTRIBUTES();
            pipesec.bInheritHandle = true;

            // Create the stdout, stderr and stdin pipes used in the process and add to the startupInfo
            SafeFileHandle stdout_read, stdout_write, stderr_read, stderr_write, stdin_read, stdin_write;
            if (!CreatePipe(out stdout_read, out stdout_write, pipesec, 0))
                throw new Win32Exception("STDOUT pipe setup failed");
            if (!SetHandleInformation(stdout_read, HandleFlags.INHERIT, 0))
                throw new Win32Exception("STDOUT pipe handle setup failed");

            if (!CreatePipe(out stderr_read, out stderr_write, pipesec, 0))
                throw new Win32Exception("STDERR pipe setup failed");
            if (!SetHandleInformation(stderr_read, HandleFlags.INHERIT, 0))
                throw new Win32Exception("STDERR pipe handle setup failed");

            if (!CreatePipe(out stdin_read, out stdin_write, pipesec, 0))
                throw new Win32Exception("STDIN pipe setup failed");
            if (!SetHandleInformation(stdin_write, HandleFlags.INHERIT, 0))
                throw new Win32Exception("STDIN pipe handle setup failed");

            si.startupInfo.hStdOutput = stdout_write;
            si.startupInfo.hStdError = stderr_write;
            si.startupInfo.hStdInput = stdin_read;

            // Setup the stdin buffer
            UTF8Encoding utf8_encoding = new UTF8Encoding(false);
            FileStream stdin_fs = new FileStream(stdin_write, FileAccess.Write, 32768);
            StreamWriter stdin = new StreamWriter(stdin_fs, utf8_encoding, 32768);

            // Create the environment block if set
            IntPtr lpEnvironment = IntPtr.Zero;

            CreationFlags startup_flags = CreationFlags.CREATE_UNICODE_ENVIRONMENT;

            PROCESS_INFORMATION pi = new PROCESS_INFORMATION();

            // Get the user tokens to try running processes with
            List<IntPtr> tokens = GetUserTokens(account, username, password, logonType);

            bool launch_success = false;
            foreach (IntPtr token in tokens)
            {
                if (CreateProcessWithTokenW(
                    token,
                    logonFlags,
                    null,
                    new StringBuilder(lpCommandLine),
                    startup_flags,
                    lpEnvironment,
                    lpCurrentDirectory,
                    si,
                    out pi))
                {
                    launch_success = true;
                    break;
                }
            }

            if (!launch_success)
                throw new Win32Exception("Failed to start become process");

            CommandResult result = new CommandResult();
            // Setup the output buffers and get stdout/stderr
            FileStream stdout_fs = new FileStream(stdout_read, FileAccess.Read, 4096);
            StreamReader stdout = new StreamReader(stdout_fs, utf8_encoding, true, 4096);
            stdout_write.Close();

            FileStream stderr_fs = new FileStream(stderr_read, FileAccess.Read, 4096);
            StreamReader stderr = new StreamReader(stderr_fs, utf8_encoding, true, 4096);
            stderr_write.Close();

            stdin.WriteLine(stdinInput);
            stdin.Close();

            string stdout_str, stderr_str = null;
            GetProcessOutput(stdout, stderr, out stdout_str, out stderr_str);
            UInt32 rc = GetProcessExitCode(pi.hProcess);

            result.StandardOut = stdout_str;
            result.StandardError = stderr_str;
            result.ExitCode = rc;

            return result;
        }

        private static SecurityIdentifier GetBecomeSid(string username)
        {
            NTAccount account = new NTAccount(username);
            try
            {
                SecurityIdentifier security_identifier = (SecurityIdentifier)account.Translate(typeof(SecurityIdentifier));
                return security_identifier;
            }
            catch (IdentityNotMappedException ex)
            {
                throw new Exception(String.Format("Unable to find become user {0}: {1}", username, ex.Message));
            }
        }

        private static List<IntPtr> GetUserTokens(SecurityIdentifier account, string username, string password, LogonType logonType)
        {
            List<IntPtr> tokens = new List<IntPtr>();
            List<String> service_sids = new List<String>()
            {
                "S-1-5-18", // NT AUTHORITY\SYSTEM
                "S-1-5-19", // NT AUTHORITY\LocalService
                "S-1-5-20"  // NT AUTHORITY\NetworkService
            };

            IntPtr hSystemToken = IntPtr.Zero;
            string account_sid = "";
            if (logonType != LogonType.LOGON32_LOGON_NEW_CREDENTIALS)
            {
                GrantAccessToWindowStationAndDesktop(account);
                // Try to get SYSTEM token handle so we can impersonate to get full admin token
                hSystemToken = GetSystemUserHandle();
                account_sid = account.ToString();
            }
            bool impersonated = false;

            try
            {
                if (hSystemToken == IntPtr.Zero && service_sids.Contains(account_sid))
                {
                    // We need the SYSTEM token if we want to become one of those accounts, fail here
                    throw new Win32Exception("Failed to get token for NT AUTHORITY\\SYSTEM");
                }
                else if (hSystemToken != IntPtr.Zero)
                {
                    // If SYSTEM impersonation failed but we're trying to become a regular user, just proceed;
                    // might get a limited token in UAC-enabled cases, but better than nothing...
                    if (ImpersonateLoggedOnUser(hSystemToken))
                        impersonated = true;
                    else if (service_sids.Contains(account_sid))
                        throw new Win32Exception("Failed to impersonate as SYSTEM account");

                }

                string domain = null;

                if (service_sids.Contains(account_sid))
                {
                    // We're using a well-known service account, do a service logon instead of the actual flag set
                    logonType = LogonType.LOGON32_LOGON_SERVICE;
                    domain = "NT AUTHORITY";
                    password = null;
                    switch (account_sid)
                    {
                        case "S-1-5-18":
                            tokens.Add(hSystemToken);
                            return tokens;
                        case "S-1-5-19":
                            username = "LocalService";
                            break;
                        case "S-1-5-20":
                            username = "NetworkService";
                            break;
                    }
                }
                else
                {
                    // We are trying to become a local or domain account
                    if (username.Contains(@"\"))
                    {
                        var user_split = username.Split(Convert.ToChar(@"\"));
                        domain = user_split[0];
                        username = user_split[1];
                    }
                    else if (username.Contains("@"))
                        domain = null;
                    else
                        domain = ".";
                }

                IntPtr hToken = IntPtr.Zero;
                if (!LogonUser(
                    username,
                    domain,
                    password,
                    logonType,
                    LogonProvider.LOGON32_PROVIDER_DEFAULT,
                    out hToken))
                {
                    throw new Win32Exception("LogonUser failed");
                }

                if (!service_sids.Contains(account_sid))
                {
                    // Try and get the elevated token for local/domain account
                    IntPtr hTokenElevated = GetElevatedToken(hToken);
                    tokens.Add(hTokenElevated);
                }

                // add the original token as a fallback
                tokens.Add(hToken);
            }
            finally
            {
                if (impersonated)
                    RevertToSelf();
            }

            return tokens;
        }

        private static IntPtr GetSystemUserHandle()
        {
            // According to CreateProcessWithTokenW we require a token with
            //  TOKEN_QUERY, TOKEN_DUPLICATE and TOKEN_ASSIGN_PRIMARY
            // Also add in TOKEN_IMPERSONATE so we can get an impersontated token
            TokenAccessLevels desired_access = TokenAccessLevels.Query |
                TokenAccessLevels.Duplicate |
                TokenAccessLevels.AssignPrimary |
                TokenAccessLevels.Impersonate;

            foreach (System.Diagnostics.Process process in System.Diagnostics.Process.GetProcesses())
            {
                using (process)
                {
                    IntPtr hProcess = OpenProcess(ProcessAccessFlags.PROCESS_QUERY_INFORMATION, false, (UInt32)process.Id);
                    if (hProcess == IntPtr.Zero)
                        continue;

                    try
                    {
                        IntPtr hToken = IntPtr.Zero;
                        if (!OpenProcessToken(hProcess, desired_access, out hToken))
                            continue;

                        try
                        {
                            string sid = GetTokenUserSID(hToken);
                            if (sid != "S-1-5-18")
                                continue;

                            // Make sure the SYSTEM token we are checking contains the SeTcbPrivilege required for
                            // escalation. Some SYSTEM tokens have this privilege stripped out.
                            List<string> actualPrivileges = GetTokenPrivileges(hToken);
                            if (!actualPrivileges.Contains("SeTcbPrivilege"))
                                continue;

                            IntPtr dupToken = IntPtr.Zero;
                            if (!DuplicateTokenEx(hToken, TokenAccessLevels.MaximumAllowed, IntPtr.Zero,
                                SECURITY_IMPERSONATION_LEVEL.SecurityImpersonation, TOKEN_TYPE.TokenPrimary,
                                out dupToken))
                            {
                                continue;
                            }
                            return dupToken;
                        }
                        finally
                        {
                            CloseHandle(hToken);
                        }
                    }
                    finally
                    {
                        CloseHandle(hProcess);
                    }
                }
            }

            return IntPtr.Zero;
        }

        private static string GetTokenUserSID(IntPtr hToken)
        {
            using (SafeMemoryBuffer tokenInfo = GetTokenInformation(hToken, TokenInformationClass.TokenUser))
            {
                TOKEN_USER tokenUser = (TOKEN_USER)Marshal.PtrToStructure(tokenInfo.DangerousGetHandle(),
                    typeof(TOKEN_USER));
                return new SecurityIdentifier(tokenUser.User.Sid).Value;
            }
        }

        private static void GetProcessOutput(StreamReader stdoutStream, StreamReader stderrStream, out string stdout, out string stderr)
        {
            var sowait = new EventWaitHandle(false, EventResetMode.ManualReset);
            var sewait = new EventWaitHandle(false, EventResetMode.ManualReset);
            string so = null, se = null;
            ThreadPool.QueueUserWorkItem((s) =>
            {
                so = stdoutStream.ReadToEnd();
                sowait.Set();
            });
            ThreadPool.QueueUserWorkItem((s) =>
            {
                se = stderrStream.ReadToEnd();
                sewait.Set();
            });
            foreach (var wh in new WaitHandle[] { sowait, sewait })
                wh.WaitOne();
            stdout = so;
            stderr = se;
        }

        private static uint GetProcessExitCode(IntPtr processHandle)
        {
            new NativeWaitHandle(processHandle).WaitOne();
            uint exitCode;
            if (!GetExitCodeProcess(processHandle, out exitCode))
                throw new Win32Exception("Error getting process exit code");
            return exitCode;
        }

        private static IntPtr GetElevatedToken(IntPtr hToken)
        {
            // First determine if the current token is a limited token
            using (SafeMemoryBuffer tokenInfo = GetTokenInformation(hToken, TokenInformationClass.TokenElevationType))
            {
                TokenElevationType tet = (TokenElevationType)Marshal.ReadInt32(tokenInfo.DangerousGetHandle());
                // We already have the best token we can get, just use it
                if (tet != TokenElevationType.TokenElevationTypeLimited)
                    return hToken;
            }

            // We have a limited token, get the linked elevated token
            using (SafeMemoryBuffer tokenInfo = GetTokenInformation(hToken, TokenInformationClass.TokenLinkedToken))
                return Marshal.ReadIntPtr(tokenInfo.DangerousGetHandle());
        }

        private static List<string> GetTokenPrivileges(IntPtr hToken)
        {
            using (SafeMemoryBuffer tokenInfo = GetTokenInformation(hToken, TokenInformationClass.TokenPrivileges))
            {
                TOKEN_PRIVILEGES tokenPrivileges = (TOKEN_PRIVILEGES)Marshal.PtrToStructure(
                    tokenInfo.DangerousGetHandle(), typeof(TOKEN_PRIVILEGES));

                LUID_AND_ATTRIBUTES[] luidAndAttributes = new LUID_AND_ATTRIBUTES[tokenPrivileges.PrivilegeCount];
                PtrToStructureArray(luidAndAttributes, IntPtr.Add(tokenInfo.DangerousGetHandle(), Marshal.SizeOf(tokenPrivileges.PrivilegeCount)));

                return luidAndAttributes.Select(x => GetPrivilegeName(x.Luid)).ToList();
            }
        }

        private static SafeMemoryBuffer GetTokenInformation(IntPtr hToken, TokenInformationClass tokenClass)
        {
            UInt32 tokenLength;
            bool res = GetTokenInformation(hToken, tokenClass, new SafeMemoryBuffer(IntPtr.Zero), 0, out tokenLength);
            if (!res && tokenLength == 0)  // res will be false due to insufficient buffer size, we ignore if we got the buffer length
                throw new Win32Exception(String.Format("GetTokenInformation({0}) failed to get buffer length", tokenClass.ToString()));

            SafeMemoryBuffer tokenInfo = new SafeMemoryBuffer((int)tokenLength);
            if (!GetTokenInformation(hToken, tokenClass, tokenInfo, tokenLength, out tokenLength))
                throw new Win32Exception(String.Format("GetTokenInformation({0}) failed", tokenClass.ToString()));

            return tokenInfo;
        }

        private static string GetPrivilegeName(LUID luid)
        {
            UInt32 nameLen = 0;
            LookupPrivilegeNameW(null, ref luid, null, ref nameLen);

            StringBuilder name = new StringBuilder((int)(nameLen + 1));
            if (!LookupPrivilegeNameW(null, ref luid, name, ref nameLen))
                throw new Win32Exception("LookupPrivilegeNameW() failed");

            return name.ToString();
        }

        private static void PtrToStructureArray<T>(T[] array, IntPtr ptr)
        {
            IntPtr ptrOffset = ptr;
            for (int i = 0; i < array.Length; i++, ptrOffset = IntPtr.Add(ptrOffset, Marshal.SizeOf(typeof(T))))
                array[i] = (T)Marshal.PtrToStructure(ptrOffset, typeof(T));
        }

        private static void GrantAccessToWindowStationAndDesktop(SecurityIdentifier account)
        {
            const int WindowStationAllAccess = 0x000f037f;
            GrantAccess(account, GetProcessWindowStation(), WindowStationAllAccess);
            const int DesktopRightsAllAccess = 0x000f01ff;
            GrantAccess(account, GetThreadDesktop(GetCurrentThreadId()), DesktopRightsAllAccess);
        }

        private static void GrantAccess(SecurityIdentifier account, IntPtr handle, int accessMask)
        {
            SafeHandle safeHandle = new NoopSafeHandle(handle);
            GenericSecurity security =
                new GenericSecurity(false, ResourceType.WindowObject, safeHandle, AccessControlSections.Access);
            security.AddAccessRule(
                new GenericAccessRule(account, accessMask, AccessControlType.Allow));
            security.Persist(safeHandle, AccessControlSections.Access);
        }

        private class GenericSecurity : NativeObjectSecurity
        {
            public GenericSecurity(bool isContainer, ResourceType resType, SafeHandle objectHandle, AccessControlSections sectionsRequested)
                : base(isContainer, resType, objectHandle, sectionsRequested) { }
            public new void Persist(SafeHandle handle, AccessControlSections includeSections) { base.Persist(handle, includeSections); }
            public new void AddAccessRule(AccessRule rule) { base.AddAccessRule(rule); }
            public override Type AccessRightType { get { throw new NotImplementedException(); } }
            public override AccessRule AccessRuleFactory(System.Security.Principal.IdentityReference identityReference, int accessMask, bool isInherited,
                InheritanceFlags inheritanceFlags, PropagationFlags propagationFlags, AccessControlType type)
            { throw new NotImplementedException(); }
            public override Type AccessRuleType { get { return typeof(AccessRule); } }
            public override AuditRule AuditRuleFactory(System.Security.Principal.IdentityReference identityReference, int accessMask, bool isInherited,
                InheritanceFlags inheritanceFlags, PropagationFlags propagationFlags, AuditFlags flags)
            { throw new NotImplementedException(); }
            public override Type AuditRuleType { get { return typeof(AuditRule); } }
        }

        private class NoopSafeHandle : SafeHandle
        {
            public NoopSafeHandle(IntPtr handle) : base(handle, false) { }
            public override bool IsInvalid { get { return false; } }
            protected override bool ReleaseHandle() { return true; }
        }

        private class GenericAccessRule : AccessRule
        {
            public GenericAccessRule(IdentityReference identity, int accessMask, AccessControlType type) :
                base(identity, accessMask, false, InheritanceFlags.None, PropagationFlags.None, type)
            { }
        }
    }
}
"@

# due to the command line size limitations of CreateProcessWithTokenW, we
# execute a simple PS script that executes our full exec_wrapper so no files
# touch the disk
$become_exec_wrapper = {
    chcp.com 65001 > $null
    $ProgressPreference = "SilentlyContinue"
    $raw = [System.Console]::In.ReadToEnd()
    $split_parts = $raw.Split(@("`0`0`0`0"), 0)
    If (-not $split_parts.Length -eq 2) { throw "invalid payload" }
    $json_raw = $split_parts[1]
    &([ScriptBlock]::Create($split_parts[0]))
}

$exec_wrapper = {
    &chcp.com 65001 > $null
    Set-StrictMode -Version 2
    $DebugPreference = "Continue"
    $ErrorActionPreference = "Stop"

    Function ConvertTo-HashtableFromPsCustomObject($myPsObject) {
        $output = @{}
        $myPsObject | Get-Member -MemberType *Property | % {
            $val = $myPsObject.($_.name)
            if ($val -is [psobject]) {
                $val = ConvertTo-HashtableFromPsCustomObject -myPsObject $val
            }
            $output.($_.name) = $val
        }
        return $output
    }

    # stream JSON including become_pw, ps_module_payload, bin_module_payload, become_payload, write_payload_path, preserve directives
    # exec runspace, capture output, cleanup, return module output. Do not change this as it is set become before being passed to the
    # become process.

    if (-not $(Get-Variable "json_raw" -ErrorAction SilentlyContinue)) {
        Write-Error "no payload supplied" -Category InvalidArgument
    }

    $payload = ConvertTo-HashtableFromPsCustomObject -myPsObject (ConvertFrom-Json $json_raw)

    # TODO: handle binary modules
    # TODO: handle persistence

    $actions = $payload.actions

    # pop 0th action as entrypoint
    $entrypoint = $payload.($actions[0])
    $payload.actions = $payload.actions[1..99]

    $entrypoint = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($entrypoint))

    # load the current action entrypoint as a module custom object with a Run method
    $entrypoint = New-Module -ScriptBlock ([scriptblock]::Create($entrypoint)) -AsCustomObject

    Set-Variable -Scope global -Name complex_args -Value $payload["module_args"] | Out-Null

    # dynamically create/load modules
    ForEach ($mod in $payload.powershell_modules.GetEnumerator()) {
        $decoded_module = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($mod.Value))
        New-Module -ScriptBlock ([scriptblock]::Create($decoded_module)) -Name $mod.Key | Import-Module -WarningAction SilentlyContinue | Out-Null
    }

    $output = $entrypoint.Run($payload)
    # base64 encode the output so the non-ascii characters are preserved
    Write-Output ([System.Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes((Write-Output $output))))
} # end exec_wrapper

Function Dump-Error ($excep, $msg=$null) {
    $eo = @{failed=$true}

    $exception_message = $excep.Exception.Message
    if ($null -ne $msg) {
        $exception_message = "$($msg): $exception_message"
    }
    $eo.msg = $exception_message
    $eo.exception = $excep | Out-String
    $host.SetShouldExit(1)

    $eo | ConvertTo-Json -Depth 10 -Compress
}

Function Parse-EnumValue($enum, $flag_type, $value, $prefix) {
    $raw_enum_value = "$prefix$($value.ToUpper())"
    try {
        $enum_value = [Enum]::Parse($enum, $raw_enum_value)
    } catch [System.ArgumentException] {
        $valid_options = [Enum]::GetNames($enum) | ForEach-Object { $_.Substring($prefix.Length).ToLower() }
        throw "become_flags $flag_type value '$value' is not valid, valid values are: $($valid_options -join ", ")"
    }
    return $enum_value
}

Function Parse-BecomeFlags($flags) {
    $logon_type = [AnsibleBecome.LogonType]::LOGON32_LOGON_INTERACTIVE
    $logon_flags = [AnsibleBecome.LogonFlags]::LOGON_WITH_PROFILE

    if ($flags -eq $null -or $flags -eq "") {
        $flag_split = @()
    } elseif ($flags -is [string]) {
        $flag_split = $flags.Split(" ")
    } else {
        throw "become_flags must be a string, was $($flags.GetType())"
    }

    foreach ($flag in $flag_split) {
        $split = $flag.Split("=")
        if ($split.Count -ne 2) {
            throw "become_flags entry '$flag' is in an invalid format, must be a key=value pair"
        }
        $flag_key = $split[0]
        $flag_value = $split[1]
        if ($flag_key -eq "logon_type") {
            $enum_details = @{
                enum = [AnsibleBecome.LogonType]
                flag_type = $flag_key
                value = $flag_value
                prefix = "LOGON32_LOGON_"
            }
            $logon_type = Parse-EnumValue @enum_details
        } elseif ($flag_key -eq "logon_flags") {
            $logon_flag_values = $flag_value.Split(",")
            $logon_flags = 0 -as [AnsibleBecome.LogonFlags]
            foreach ($logon_flag_value in $logon_flag_values) {
                if ($logon_flag_value -eq "") {
                    continue
                }
                $enum_details = @{
                    enum = [AnsibleBecome.LogonFlags]
                    flag_type = $flag_key
                    value = $logon_flag_value
                    prefix = "LOGON_"
                }
                $logon_flag = Parse-EnumValue @enum_details
                $logon_flags = $logon_flags -bor $logon_flag
            }
        } else {
            throw "become_flags key '$flag_key' is not a valid runas flag, must be 'logon_type' or 'logon_flags'"
        }
    }

    return $logon_type, [AnsibleBecome.LogonFlags]$logon_flags
}

Function Run($payload) {
    # NB: action popping handled inside subprocess wrapper

    $original_tmp = $env:TMP
    $remote_tmp = $payload["module_args"]["_ansible_remote_tmp"]
    $remote_tmp = [System.Environment]::ExpandEnvironmentVariables($remote_tmp)
    if ($null -eq $remote_tmp) {
        $remote_tmp = $original_tmp
    }

    # become process is run under a different console to the WinRM one so we
    # need to set the UTF-8 codepage again
    $env:TMP = $remote_tmp
    Add-Type -TypeDefinition $helper_def -Debug:$false
    $env:TMP = $original_tmp

    $username = $payload.become_user
    $password = $payload.become_password
    try {
        $logon_type, $logon_flags = Parse-BecomeFlags -flags $payload.become_flags
    } catch {
        Dump-Error -excep $_ -msg "Failed to parse become_flags '$($payload.become_flags)'"
        return $null
    }

    # NB: CreateProcessWithTokenW commandline maxes out at 1024 chars, must bootstrap via small
    # wrapper which calls our read wrapper passed through stdin. Cannot use 'powershell -' as
    # the $ErrorActionPreference is always set to Stop and cannot be changed
    $payload_string = $payload | ConvertTo-Json -Depth 99 -Compress
    $exec_wrapper = $exec_wrapper.ToString() + "`0`0`0`0" + $payload_string
    $rc = 0

    $exec_command = [Convert]::ToBase64String([System.Text.Encoding]::Unicode.GetBytes($become_exec_wrapper.ToString()))
    $lp_command_line = New-Object System.Text.StringBuilder @("powershell.exe -NonInteractive -NoProfile -ExecutionPolicy Bypass -EncodedCommand $exec_command")
    $lp_current_directory = "$env:SystemRoot"

    Try {
        $result = [AnsibleBecome.BecomeUtil]::RunAsUser($username, $password, $lp_command_line, $lp_current_directory, $exec_wrapper, $logon_flags, $logon_type)
        $stdout = $result.StandardOut
        $stdout = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($stdout.Trim()))
        $stderr = $result.StandardError
        $rc = $result.ExitCode

        $host.UI.WriteLine($stdout)
        $host.UI.WriteErrorLine($stderr.Trim())
    } Catch {
        $excep = $_
        Dump-Error -excep $excep -msg "Failed to become user $username"
    }
    $host.SetShouldExit($rc)
}
s�
Set-StrictMode -Version 2
$ErrorActionPreference = "Stop"

# build exec_wrapper encoded command
# start powershell with breakaway running exec_wrapper encodedcommand
# stream payload to powershell with normal exec, but normal exec writes results to resultfile instead of stdout/stderr
# return asyncresult to controller

$exec_wrapper = {
    # help to debug any errors in the exec_wrapper or async_watchdog by generating
    # an error log in case of a terminating error
    trap {
        $log_path = "$($env:TEMP)\async-exec-wrapper-$(Get-Date -Format "yyyy-MM-ddTHH-mm-ss.ffffZ")-error.txt"
        $error_msg = "Error while running the async exec wrapper`r`n$_`r`n$($_.ScriptStackTrace)"
        Set-Content -Path $log_path -Value $error_msg
        throw $_
    }

    &chcp.com 65001 > $null
    $DebugPreference = "Continue"
    $ErrorActionPreference = "Stop"
    Set-StrictMode -Version 2

    function ConvertTo-HashtableFromPsCustomObject ($myPsObject){
        $output = @{};
        $myPsObject | Get-Member -MemberType *Property | % {
            $val = $myPsObject.($_.name);
            If ($val -is [psobject]) {
                $val = ConvertTo-HashtableFromPsCustomObject $val
            }
            $output.($_.name) = $val
        }
        return $output;
    }

    # store the pipe name and no. of bytes to read, these are populated by the
    # Run function before being run - do not remove or change
    $pipe_name = ""
    $bytes_length = 0

    # stream JSON including become_pw, ps_module_payload, bin_module_payload, become_payload, write_payload_path, preserve directives
    # exec runspace, capture output, cleanup, return module output
    $input_bytes = New-Object -TypeName byte[] -ArgumentList $bytes_length
    $pipe = New-Object -TypeName System.IO.Pipes.NamedPipeClientStream -ArgumentList @(
        ".",  # localhost
        $pipe_name,
        [System.IO.Pipes.PipeDirection]::In,
        [System.IO.Pipes.PipeOptions]::None,
        [System.Security.Principal.TokenImpersonationLevel]::Anonymous
    )
    try {
        $pipe.Connect()
        $pipe.Read($input_bytes, 0, $bytes_length) > $null
    } finally {
        $pipe.Close()
    }
    $json_raw = [System.Text.Encoding]::UTF8.GetString($input_bytes)

    If (-not $json_raw) {
        Write-Error "no input given" -Category InvalidArgument
    }

    $payload = ConvertTo-HashtableFromPsCustomObject (ConvertFrom-Json $json_raw)

    # TODO: handle binary modules
    # TODO: handle persistence

    $actions = $payload.actions

    # pop 0th action as entrypoint
    $entrypoint = $payload.($actions[0])
    $payload.actions = $payload.actions[1..99]

    $entrypoint = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($entrypoint))

    # load the current action entrypoint as a module custom object with a Run method
    $entrypoint = New-Module -ScriptBlock ([scriptblock]::Create($entrypoint)) -AsCustomObject

    Set-Variable -Scope global -Name complex_args -Value $payload["module_args"] | Out-Null

    # dynamically create/load modules
    ForEach ($mod in $payload.powershell_modules.GetEnumerator()) {
        $decoded_module = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($mod.Value))
        New-Module -ScriptBlock ([scriptblock]::Create($decoded_module)) -Name $mod.Key | Import-Module -WarningAction SilentlyContinue | Out-Null
    }

    $output = $entrypoint.Run($payload)

    Write-Output $output
} # end exec_wrapper


Function Run($payload) {
    $remote_tmp = $payload["module_args"]["_ansible_remote_tmp"]
    $remote_tmp = [System.Environment]::ExpandEnvironmentVariables($remote_tmp)

    # calculate the result path so we can include it in the worker payload
    $jid = $payload.async_jid
    $local_jid = $jid + "." + $pid

    $results_path = [System.IO.Path]::Combine($remote_tmp, ".ansible_async", $local_jid)

    $payload.async_results_path = $results_path

    [System.IO.Directory]::CreateDirectory([System.IO.Path]::GetDirectoryName($results_path)) | Out-Null

    # can't use anonymous pipes as the spawned process will not be a child due to
    # the way WMI works, use a named pipe with a random name instead and set to
    # only allow current user to read from the pipe
    $pipe_name = "ansible-async-$jid-$([guid]::NewGuid())"
    $current_user = ([Security.Principal.WindowsIdentity]::GetCurrent()).User
    $payload_string = $payload | ConvertTo-Json -Depth 99 -Compress
    $payload_bytes = [System.Text.Encoding]::UTF8.GetBytes($payload_string)

    $pipe_sec = New-Object -TypeName System.IO.Pipes.PipeSecurity
    $pipe_ar = New-Object -TypeName System.IO.Pipes.PipeAccessRule -ArgumentList @(
        $current_user,
        [System.IO.Pipes.PipeAccessRights]::Read,
        [System.Security.AccessControl.AccessControlType]::Allow
    )
    $pipe_sec.AddAccessRule($pipe_ar)
    $pipe = New-Object -TypeName System.IO.Pipes.NamedPipeServerStream -ArgumentList @(
        $pipe_name,
        [System.IO.Pipes.PipeDirection]::Out,
        1,
        [System.IO.Pipes.PipeTransmissionMode]::Byte,
        [System.IO.Pipes.PipeOptions]::Asynchronous,
        0,
        0,
        $pipe_sec
    )

    try {
        $exec_wrapper_str = $exec_wrapper.ToString()
        $exec_wrapper_str = $exec_wrapper_str.Replace('$pipe_name = ""', "`$pipe_name = `"$pipe_name`"")
        $exec_wrapper_str = $exec_wrapper_str.Replace('$bytes_length = 0', "`$bytes_length = $($payload_bytes.Count)")

        $encoded_command = [Convert]::ToBase64String([System.Text.Encoding]::Unicode.GetBytes($exec_wrapper_str))
        $exec_args = "powershell.exe -NonInteractive -NoProfile -ExecutionPolicy Bypass -EncodedCommand $encoded_command"

        # not all connection plugins support breakaway from job that is required
        # for async, Win32_Process.Create() is still able to escape so we use
        # that here
        $process = Invoke-CimMethod -ClassName Win32_Process -Name Create -Arguments @{CommandLine=$exec_args}
        $rc = $process.ReturnValue
        if ($rc -ne 0) {
            $error_msg = switch($rc) {
                2 { "Access denied" }
                3 { "Insufficient privilege" }
                8 { "Unknown failure" }
                9 { "Path not found" }
                21 { "Invalid parameter" }
                default { "Other" }
            }
            throw "Failed to start async process: $rc ($error_msg)"
        }
        $watchdog_pid = $process.ProcessId

        # populate initial results before we send the async data to avoid result race
        $result = @{
            started = 1;
            finished = 0;
            results_file = $results_path;
            ansible_job_id = $local_jid;
            _ansible_suppress_tmpdir_delete = $true;
            ansible_async_watchdog_pid = $watchdog_pid
        }

        $result_json = ConvertTo-Json $result
        Set-Content $results_path -Value $result_json

        # wait until the client connects, throw an error if the timeout is reached
        $wait_async = $pipe.BeginWaitForConnection($null, $null)
        $wait_async.AsyncWaitHandle.WaitOne(5000) > $null
        if (-not $wait_async.IsCompleted) {
            throw "timeout while waiting for child process to connect to named pipe"
        }
        $pipe.EndWaitForConnection($wait_async)

        # write the exec manifest to the child process
        $pipe.Write($payload_bytes, 0, $payload_bytes.Count)
        $pipe.Flush()
        $pipe.WaitForPipeDrain()
    } finally {
        $pipe.Close()
    }

    return $result_json
}

s�
Set-StrictMode -Version 2
$ErrorActionPreference = "Stop"

Add-Type -AssemblyName System.Web.Extensions

Function Log {
    Param(
        [string]$msg
    )

    If(Get-Variable -Name log_path -ErrorAction SilentlyContinue) {
        Add-Content $log_path $msg
    }
}

Function Deserialize-Json {
    Param(
        [Parameter(ValueFromPipeline=$true)]
        [string]$json
    )

    # FUTURE: move this into module_utils/powershell.ps1 and use for everything (sidestep PSCustomObject issues)
    # FUTURE: won't work w/ Nano Server/.NET Core- fallback to DataContractJsonSerializer (which can't handle dicts on .NET 4.0)

    Log "Deserializing:`n$json"

    $jss = New-Object System.Web.Script.Serialization.JavaScriptSerializer
    return $jss.DeserializeObject($json)
}

Function Write-Result {
    Param(
        [hashtable]$result,
        [string]$resultfile_path
    )

    $result | ConvertTo-Json | Set-Content -Path $resultfile_path
}

Function Run($payload) {
    $actions = $payload.actions

    # pop 0th action as entrypoint
    $entrypoint = $payload.($actions[0])
    $entrypoint = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($entrypoint))

    $payload.actions = $payload.actions[1..99]

    $resultfile_path = $payload.async_results_path
    $max_exec_time_sec = $payload.async_timeout_sec

    Log "deserializing existing resultfile args"
    # read in existing resultsfile to merge w/ module output (it should be written by the time we're unsuspended and running)
    $result = Get-Content $resultfile_path -Raw | Deserialize-Json

    Log "deserialized result is $($result | Out-String)"

    Log "creating runspace"

    $rs = [runspacefactory]::CreateRunspace()
    $rs.Open()

    Log "creating Powershell object"

    $job = [powershell]::Create()
    $job.Runspace = $rs

    $job.AddScript($entrypoint) | Out-Null
    $job.AddStatement().AddCommand("Run").AddArgument($payload) | Out-Null

    Log "job BeginInvoke()"

    $job_asyncresult = $job.BeginInvoke()

    Log "waiting $max_exec_time_sec seconds for job to complete"

    $signaled = $job_asyncresult.AsyncWaitHandle.WaitOne($max_exec_time_sec * 1000)

    $result["finished"] = 1

    If($job_asyncresult.IsCompleted) {
        Log "job completed, calling EndInvoke()"

        $job_output = $job.EndInvoke($job_asyncresult)
        $job_error = $job.Streams.Error

        Log "raw module stdout: \r\n$job_output"
        If($job_error) {
            Log "raw module stderr: \r\n$job_error"
        }

        # write success/output/error to result object

        # TODO: cleanse leading/trailing junk
        Try {
            $module_result = Deserialize-Json $job_output
            # TODO: check for conflicting keys
            $result = $result + $module_result
        }
        Catch {
            $excep = $_

            $result.failed = $true
            $result.msg = "failed to parse module output: $excep"
            # return the output back to Ansible to help with debugging errors
            $result.stdout = $job_output | Out-String
            $result.stderr = $job_error | Out-String
        }

        # TODO: determine success/fail, or always include stderr if nonempty?
        Write-Result $result $resultfile_path

        Log "wrote output to $resultfile_path"
    }
    Else {
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