win_become: get admin token and fix async (#32485)

* win_become: make it easier to become with an admin token

* Fixed up pep8 whitespace

* fix for Server 2008

* Added support for async and become on newer hosts and fix warnings

lib/ansible/plugins/shell/powershell.py

@@ -171,9 +171,12 @@ 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.InteropServices;
 using System.Security.AccessControl;
 using System.Security.Principal;
@@ -212,9 +215,9 @@ namespace Ansible
         public Int16 wShowWindow;
         public Int16 cbReserved2;
         public IntPtr lpReserved2;
-        public IntPtr hStdInput;
-        public IntPtr hStdOutput;
-        public IntPtr hStdError;
+        public SafeFileHandle hStdInput;
+        public SafeFileHandle hStdOutput;
+        public SafeFileHandle hStdError;
         public STARTUPINFO()
         {
             cb = Marshal.SizeOf(this);
@@ -254,6 +257,42 @@ namespace Ansible
         public SID_AND_ATTRIBUTES User;
     }
 
+    [StructLayout(LayoutKind.Sequential)]
+    public struct IO_COUNTERS
+    {
+        public UInt64 ReadOperationCount;
+        public UInt64 WriteOperationCount;
+        public UInt64 OtherOperationCount;
+        public UInt64 ReadTransferCount;
+        public UInt64 WriteTransferCount;
+        public UInt64 OtherTransferCount;
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    public struct JOBOBJECT_BASIC_LIMIT_INFORMATION
+    {
+        public UInt64 PerProcessUserTimeLimit;
+        public UInt64 PerJobUserTimeLimit;
+        public LimitFlags LimitFlags;
+        public UIntPtr MinimumWorkingSetSize;
+        public UIntPtr MaximumWorkingSetSize;
+        public UInt32 ActiveProcessLimit;
+        public UIntPtr Affinity;
+        public UInt32 PriorityClass;
+        public UInt32 SchedulingClass;
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    public struct JOBOBJECT_EXTENDED_LIMIT_INFORMATION
+    {
+        public JOBOBJECT_BASIC_LIMIT_INFORMATION BasicLimitInformation;
+        public IO_COUNTERS IoInfo;
+        public UIntPtr ProcessMemoryLimit;
+        public UIntPtr JobMemoryLimit;
+        public UIntPtr PeakProcessMemoryUsed;
+        public UIntPtr PeakJobMemoryUsed;
+    }
+
     [Flags]
     public enum StartupInfoFlags : uint
     {
@@ -263,6 +302,7 @@ namespace Ansible
     [Flags]
     public enum CreationFlags : uint
     {
+        CREATE_BREAKAWAY_FROM_JOB = 0x01000000,
         CREATE_DEFAULT_ERROR_MODE = 0x04000000,
         CREATE_NEW_CONSOLE = 0x00000010,
         CREATE_NEW_PROCESS_GROUP = 0x00000200,
@@ -353,11 +393,35 @@ namespace Ansible
         TokenImpersonation
     }
 
+    enum JobObjectInfoType
+    {
+        AssociateCompletionPortInformation = 7,
+        BasicLimitInformation = 2,
+        BasicUIRestrictions = 4,
+        EndOfJobTimeInformation = 6,
+        ExtendedLimitInformation = 9,
+        SecurityLimitInformation = 5,
+        GroupInformation = 11
+    }
+
+    [Flags]
+    enum ThreadAccessRights : uint
+    {
+        SUSPEND_RESUME = 0x0002
+    }
+
+    [Flags]
+    public enum LimitFlags : uint
+    {
+        JOB_OBJECT_LIMIT_BREAKAWAY_OK = 0x00000800,
+        JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE = 0x00002000
+    }
+
     class NativeWaitHandle : WaitHandle
     {
         public NativeWaitHandle(IntPtr handle)
         {
-            this.Handle = handle;
+            this.SafeWaitHandle = new SafeWaitHandle(handle, false);
         }
     }
 
@@ -380,6 +444,69 @@ namespace Ansible
         public uint ExitCode { get; internal set; }
     }
 
+    public class Job : IDisposable
+    {
+        [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
+        private static extern IntPtr CreateJobObject(
+            IntPtr lpJobAttributes,
+            string lpName);
+
+        [DllImport("kernel32.dll", SetLastError = true)]
+        private static extern bool SetInformationJobObject(
+            IntPtr hJob,
+            JobObjectInfoType JobObjectInfoClass,
+            IntPtr lpJobObjectInfo,
+            UInt32 cbJobObjectInfoLength);
+
+        [DllImport("kernel32.dll", SetLastError = true)]
+        private static extern bool AssignProcessToJobObject(
+            IntPtr hJob,
+            IntPtr hProcess);
+
+        [DllImport("kernel32.dll")]
+        private static extern bool CloseHandle(
+            IntPtr hObject);
+
+        private IntPtr handle;
+
+        public Job()
+        {
+            handle = CreateJobObject(IntPtr.Zero, null);
+            if (handle == IntPtr.Zero)
+                throw new Win32Exception("CreateJobObject() failed");
+
+            JOBOBJECT_BASIC_LIMIT_INFORMATION jobInfo = new JOBOBJECT_BASIC_LIMIT_INFORMATION();
+            jobInfo.LimitFlags = LimitFlags.JOB_OBJECT_LIMIT_BREAKAWAY_OK | LimitFlags.JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE;
+
+            JOBOBJECT_EXTENDED_LIMIT_INFORMATION extendedJobInfo = new JOBOBJECT_EXTENDED_LIMIT_INFORMATION();
+            extendedJobInfo.BasicLimitInformation = jobInfo;
+
+            int length = Marshal.SizeOf(typeof(JOBOBJECT_EXTENDED_LIMIT_INFORMATION));
+            IntPtr pExtendedJobInfo = Marshal.AllocHGlobal(length);
+            Marshal.StructureToPtr(extendedJobInfo, pExtendedJobInfo, false);
+
+            if (!SetInformationJobObject(handle, JobObjectInfoType.ExtendedLimitInformation, pExtendedJobInfo, (UInt32)length))
+                throw new Win32Exception("SetInformationJobObject() failed");
+        }
+
+        public void AssignProcess(IntPtr processHandle)
+        {
+            if (!AssignProcessToJobObject(handle, processHandle))
+                throw new Win32Exception("AssignProcessToJobObject() failed");
+        }
+
+        public void Dispose()
+        {
+            if (handle != IntPtr.Zero)
+            {
+                CloseHandle(handle);
+                handle = IntPtr.Zero;
+            }
+
+            GC.SuppressFinalize(this);
+        }
+    }
+
     public class BecomeUtil
     {
         [DllImport("advapi32.dll", SetLastError = true)]
@@ -407,14 +534,14 @@ namespace Ansible
 
         [DllImport("kernel32.dll")]
         private static extern bool CreatePipe(
-            out IntPtr hReadPipe,
-            out IntPtr hWritePipe,
+            out SafeFileHandle hReadPipe,
+            out SafeFileHandle hWritePipe,
             SECURITY_ATTRIBUTES lpPipeAttributes,
             uint nSize);
 
         [DllImport("kernel32.dll", SetLastError = true)]
         private static extern bool SetHandleInformation(
-            IntPtr hObject,
+            SafeFileHandle hObject,
             HandleFlags dwMask,
             int dwFlags);
 
@@ -431,7 +558,8 @@ namespace Ansible
         private static extern IntPtr GetProcessWindowStation();
 
         [DllImport("user32.dll", SetLastError = true)]
-        private static extern IntPtr GetThreadDesktop(int dwThreadId);
+        private static extern IntPtr GetThreadDesktop(
+            int dwThreadId);
 
         [DllImport("kernel32.dll", SetLastError = true)]
         private static extern int GetCurrentThreadId();
@@ -480,17 +608,27 @@ namespace Ansible
             out IntPtr phNewToken);
 
         [DllImport("advapi32.dll", SetLastError = true)]
-        public static extern bool ImpersonateLoggedOnUser(
+        private static extern bool ImpersonateLoggedOnUser(
             IntPtr hToken);
 
         [DllImport("advapi32.dll", SetLastError = true)]
-        public static extern bool RevertToSelf();
+        private static extern bool RevertToSelf();
+
+        [DllImport("kernel32.dll", SetLastError = true)]
+        private static extern SafeFileHandle OpenThread(
+            ThreadAccessRights dwDesiredAccess,
+            bool bInheritHandle,
+            int dwThreadId);
+
+        [DllImport("kernel32.dll", SetLastError = true)]
+        private static extern int ResumeThread(
+            SafeHandle hThread);
 
         public static CommandResult RunAsUser(string username, string password, string lpCommandLine, string lpCurrentDirectory, string stdinInput)
         {
             SecurityIdentifier account = GetBecomeSid(username);
 
-            CreationFlags startup_flags = CreationFlags.CREATE_UNICODE_ENVIRONMENT;
+            CreationFlags startup_flags = CreationFlags.CREATE_UNICODE_ENVIRONMENT | CreationFlags.CREATE_BREAKAWAY_FROM_JOB | CreationFlags.CREATE_SUSPENDED;
 
             STARTUPINFOEX si = new STARTUPINFOEX();
             si.startupInfo.dwFlags = (int)StartupInfoFlags.USESTDHANDLES;
@@ -499,7 +637,7 @@ namespace Ansible
             pipesec.bInheritHandle = true;
 
             // Create the stdout, stderr and stdin pipes used in the process and add to the startupInfo
-            IntPtr stdout_read, stdout_write, stderr_read, stderr_write, stdin_read, stdin_write = IntPtr.Zero;
+            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))
@@ -521,7 +659,7 @@ namespace Ansible
 
             // Setup the stdin buffer
             UTF8Encoding utf8_encoding = new UTF8Encoding(false);
-            FileStream stdin_fs = new FileStream(stdin_write, FileAccess.Write, true, 32768);
+            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
@@ -554,26 +692,44 @@ namespace Ansible
             if (!launch_success)
                 throw new Win32Exception("Failed to start become process");
 
-            // Setup the output buffers and get stdout/stderr
-            FileStream stdout_fs = new FileStream(stdout_read, FileAccess.Read, true, 4096);
-            StreamReader stdout = new StreamReader(stdout_fs, utf8_encoding, true, 4096);
-            CloseHandle(stdout_write);
-
-            FileStream stderr_fs = new FileStream(stderr_read, FileAccess.Read, true, 4096);
-            StreamReader stderr = new StreamReader(stderr_fs, utf8_encoding, true, 4096);
-            CloseHandle(stderr_write);
-
-            stdin.WriteLine(stdinInput);
-            stdin.Close();
-
-            string stdout_str, stderr_str = null;
-            GetProcessOutput(stdout, stderr, out stdout_str, out stderr_str);
-            uint rc = GetProcessExitCode(pi.hProcess);
+            // If 2012/8+ OS, create new job with JOB_OBJECT_LIMIT_BREAKAWAY_OK
+            // so that async can work
+            Job job = null;
+            if (Environment.OSVersion.Version >= new Version("6.2"))
+            {
+                job = new Job();
+                job.AssignProcess(pi.hProcess);
+            }
+            ResumeProcessById(pi.dwProcessId);
 
             CommandResult result = new CommandResult();
-            result.StandardOut = stdout_str;
-            result.StandardError = stderr_str;
-            result.ExitCode = rc;
+            try
+            {
+                // 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;
+            }
+            finally
+            {
+                if (job != null)
+                    job.Dispose();
+            }
 
             return result;
         }
@@ -604,71 +760,64 @@ namespace Ansible
 
             GrantAccessToWindowStationAndDesktop(account);
             string account_sid = account.ToString();
+            bool impersonated = false;
+            IntPtr hSystemTokenDup = IntPtr.Zero;
 
+            // Try to get SYSTEM token handle so we can impersonate to get full admin token
+            IntPtr hSystemToken = GetSystemUserHandle();
+            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)
+            {
+                // We have the token, need to duplicate and impersonate
+                bool dupResult = DuplicateTokenEx(
+                    hSystemToken,
+                    TokenAccessLevels.MaximumAllowed,
+                    IntPtr.Zero,
+                    SECURITY_IMPERSONATION_LEVEL.SecurityImpersonation,
+                    TOKEN_TYPE.TokenPrimary,
+                    out hSystemTokenDup);
+                int lastError = Marshal.GetLastWin32Error();
+                CloseHandle(hSystemToken);
+
+                if (!dupResult && service_sids.Contains(account_sid))
+                    throw new Win32Exception(lastError, "Failed to duplicate token for NT AUTHORITY\\SYSTEM");
+                else if (dupResult && account_sid != "S-1-5-18")
+                {
+                    if (ImpersonateLoggedOnUser(hSystemTokenDup))
+                        impersonated = true;
+                    else if (service_sids.Contains(account_sid))
+                        throw new Win32Exception("Failed to impersonate as SYSTEM account");
+                }
+            }
+
+            LogonType logonType;
+            string domain = null;
             if (service_sids.Contains(account_sid))
             {
-                // We are trying to become to a service account
-                IntPtr hToken = GetUserHandle();
-                if (hToken == IntPtr.Zero)
-                    throw new Exception("Failed to get token for NT AUTHORITY\\SYSTEM");
-
-                IntPtr hTokenDup = IntPtr.Zero;
-                try
-                {
-                    if (!DuplicateTokenEx(
-                        hToken,
-                        TokenAccessLevels.MaximumAllowed,
-                        IntPtr.Zero,
-                        SECURITY_IMPERSONATION_LEVEL.SecurityImpersonation,
-                        TOKEN_TYPE.TokenPrimary,
-                        out hTokenDup))
-                    {
-                        throw new Win32Exception("Failed to duplicate the SYSTEM account token");
-                    }
-                }
-                finally
-                {
-                    CloseHandle(hToken);
-                }
-
-                string lpszDomain = "NT AUTHORITY";
-                string lpszUsername = null;
+                logonType = LogonType.LOGON32_LOGON_SERVICE;
+                domain = "NT AUTHORITY";
+                password = null;
                 switch (account_sid)
                 {
                     case "S-1-5-18":
-                        tokens.Add(hTokenDup);
+                        tokens.Add(hSystemTokenDup);
                         return tokens;
                     case "S-1-5-19":
-                        lpszUsername = "LocalService";
+                        username = "LocalService";
                         break;
                     case "S-1-5-20":
-                        lpszUsername = "NetworkService";
+                        username = "NetworkService";
                         break;
                 }
-
-                if (!ImpersonateLoggedOnUser(hTokenDup))
-                    throw new Win32Exception("Failed to impersonate as SYSTEM account");
-
-                IntPtr newToken = IntPtr.Zero;
-                if (!LogonUser(
-                    lpszUsername,
-                    lpszDomain,
-                    null,
-                    LogonType.LOGON32_LOGON_SERVICE,
-                    LogonProvider.LOGON32_PROVIDER_DEFAULT,
-                    out newToken))
-                {
-                    throw new Win32Exception("LogonUser failed");
-                }
-
-                RevertToSelf();
-                tokens.Add(newToken);
-                return tokens;
             }
             else
             {
                 // We are trying to become a local or domain account
-                string domain = null;
+                logonType = LogonType.LOGON32_LOGON_INTERACTIVE;
                 if (username.Contains(@"\"))
                 {
                     var user_split = username.Split(Convert.ToChar(@"\"));
@@ -679,31 +828,35 @@ namespace Ansible
                     domain = null;
                 else
                     domain = ".";
-
-                // Logon and get the token
-                IntPtr hToken = IntPtr.Zero;
-                if (!LogonUser(
-                    username,
-                    domain,
-                    password,
-                    LogonType.LOGON32_LOGON_INTERACTIVE,
-                    LogonProvider.LOGON32_PROVIDER_DEFAULT,
-                    out hToken))
-                {
-                    throw new Win32Exception("LogonUser failed");
-                }
-
-                // Get the elevate token
-                IntPtr hTokenElevated = GetElevatedToken(hToken);
-
-                tokens.Add(hTokenElevated);
-                tokens.Add(hToken);
-
-                return tokens;
             }
+
+            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);
+            }
+            tokens.Add(hToken);
+
+            if (impersonated)
+                RevertToSelf();
+
+            return tokens;
         }
 
-        private static IntPtr GetUserHandle()
+        private static IntPtr GetSystemUserHandle()
         {
             uint array_byte_size = 1024 * sizeof(uint);
             IntPtr[] pids = new IntPtr[1024];
@@ -864,6 +1017,44 @@ namespace Ansible
             security.Persist(safeHandle, AccessControlSections.Access);
         }
 
+        private static void ResumeThreadById(int threadId)
+        {
+            var threadHandle = OpenThread(ThreadAccessRights.SUSPEND_RESUME, false, threadId);
+            if (threadHandle.IsInvalid)
+                throw new Win32Exception(String.Format("Thread ID {0} is invalid", threadId));
+
+            try
+            {
+                if (ResumeThread(threadHandle) == -1)
+                    throw new Win32Exception(String.Format("Thread ID {0} cannot be resumed", threadId));
+            }
+            finally
+            {
+                threadHandle.Dispose();
+            }
+        }
+
+        private static void ResumeProcessById(int pid)
+        {
+            var proc = Process.GetProcessById(pid);
+
+            // wait for at least one suspended thread in the process (this handles possible slow startup race where
+            // primary thread of created-suspended process has not yet become runnable)
+            var retryCount = 0;
+            while (!proc.Threads.OfType<ProcessThread>().Any(t => t.ThreadState == System.Diagnostics.ThreadState.Wait &&
+                 t.WaitReason == ThreadWaitReason.Suspended))
+            {
+                proc.Refresh();
+                Thread.Sleep(50);
+                if (retryCount > 100)
+                    throw new InvalidOperationException(String.Format("No threads were suspended in target PID {0} after 5s", pid));
+            }
+
+            foreach (var thread in proc.Threads.OfType<ProcessThread>().Where(t => t.ThreadState == System.Diagnostics.ThreadState.Wait &&
+                 t.WaitReason == ThreadWaitReason.Suspended))
+                ResumeThreadById(thread.Id);
+        }
+
         private class GenericSecurity : NativeObjectSecurity
         {
             public GenericSecurity(bool isContainer, ResourceType resType, SafeHandle objectHandle, AccessControlSections sectionsRequested)
@@ -969,8 +1160,7 @@ Function Run($payload) {
     $username = $payload.become_user
     $password = $payload.become_password
 
-    # FUTURE: convert to SafeHandle so we can stop ignoring warnings?
-    Add-Type -TypeDefinition $helper_def -Debug:$false -IgnoreWarnings
+    Add-Type -TypeDefinition $helper_def -Debug:$false
 
     # NB: CreateProcessWithTokenW commandline maxes out at 1024 chars, must bootstrap via filesystem
     $temp = [System.IO.Path]::Combine([System.IO.Path]::GetTempPath(), [System.IO.Path]::GetRandomFileName() + ".ps1")

test/integration/targets/win_become/tasks/main.yml

@@ -1,5 +1,6 @@
 - set_fact:
     become_test_username: ansible_become_test
+    become_test_admin_username: ansible_become_admin
     gen_pw: password123! + {{ lookup('password', '/dev/null chars=ascii_letters,digits length=8') }}
 
 - name: create unprivileged user
@@ -9,16 +10,19 @@
     update_password: always
     groups: Users
 
+- name: create a privileged user
+  win_user:
+    name: "{{ become_test_admin_username }}"
+    password: "{{ gen_pw }}"
+    update_password: always
+    groups: Administrators
+
 - name: execute tests and ensure that test user is deleted regardless of success/failure
   block:
   - name: ensure current user is not the become user
     win_shell: whoami
     register: whoami_out
-
-  - name: verify output
-    assert:
-      that:
-      - not whoami_out.stdout_lines[0].endswith(become_test_username)
+    failed_when: whoami_out.stdout_lines[0].endswith(become_test_username) or whoami_out.stdout_lines[0].endswith(become_test_admin_username)
 
   - name: get become user profile dir so we can clean it up later
     vars: &become_vars
@@ -34,7 +38,21 @@
       that:
       - become_test_username in profile_dir_out.stdout_lines[0]
 
-  - name: test become runas via task vars
+  - name: get become admin user profile dir so we can clean it up later
+    vars: &admin_become_vars
+      ansible_become_user: "{{ become_test_admin_username }}"
+      ansible_become_password: "{{ gen_pw }}"
+      ansible_become_method: runas
+      ansible_become: yes
+    win_shell: $env:USERPROFILE
+    register: admin_profile_dir_out
+
+  - name: ensure profile dir contains admin test username
+    assert:
+      that:
+      - become_test_admin_username in admin_profile_dir_out.stdout_lines[0]
+
+  - name: test become runas via task vars (underprivileged user)
     vars: *become_vars
     win_shell: whoami
     register: whoami_out
@@ -44,6 +62,36 @@
       that:
       - whoami_out.stdout_lines[0].endswith(become_test_username)
 
+  - name: test become runas to ensure underprivileged user has medium integrity level
+    vars: *become_vars
+    win_shell: whoami /groups
+    register: whoami_out
+  
+  - name: verify output
+    assert:
+      that:
+      - '"Mandatory Label\Medium Mandatory Level" in whoami_out.stdout'
+
+  - name: test become runas via task vars (privileged user)
+    vars: *admin_become_vars
+    win_shell: whoami
+    register: whoami_out
+  
+  - name: verify output
+    assert:
+      that:
+      - whoami_out.stdout_lines[0].endswith(become_test_admin_username)
+
+  - name: test become runas to ensure privileged user has high integrity level
+    vars: *admin_become_vars
+    win_shell: whoami /groups
+    register: whoami_out
+  
+  - name: verify output
+    assert:
+      that:
+      - '"Mandatory Label\High Mandatory Level" in whoami_out.stdout'
+
   - name: test become runas via task keywords
     vars:
       ansible_become_password: "{{ gen_pw }}"
@@ -51,7 +99,6 @@
     become_method: runas
     become_user: "{{ become_test_username }}"
     win_shell: whoami
-
     register: whoami_out
 
   - name: verify output
@@ -111,17 +158,54 @@
       that:
       - whoami_out.stdout_lines[0] == "nt authority\\local service"
 
+  # Test out Async on Windows Server 2012+
+  - name: get OS version
+    win_shell: if ([System.Environment]::OSVersion.Version -ge [Version]"6.2") { $true } else { $false }
+    register: os_version
+  
+  - name: test become + async on older hosts
+    vars: *become_vars
+    win_command: whoami
+    async: 10
+    register: whoami_out
+    ignore_errors: yes
+  
+  - name: verify older hosts failed with become + async
+    assert:
+      that:
+      - whoami_out|failed
+    when: os_version.stdout_lines[0] == "False"
+
+  - name: verify newer hosts worked with become + async
+    assert:
+      that:
+      - whoami_out|success
+    when: os_version.stdout_lines[0] == "True"
+
 # FUTURE: test raw + script become behavior once they're running under the exec wrapper again
 # FUTURE: add standalone playbook tests to include password prompting and play become keywords
 
   always:
-  - name: ensure test user is deleted
+  - name: ensure underprivileged test user is deleted
     win_user:
       name: "{{ become_test_username }}"
       state: absent
-  - name: ensure test user profile is deleted
+  
+  - name: ensure privileged test user is deleted
+    win_user:
+      name: "{{ become_test_admin_username }}"
+      state: absent
+
+  - name: ensure underprivileged test user profile is deleted
     # NB: have to work around powershell limitation of long filenames until win_file fixes it
     win_shell: rmdir /S /Q {{ profile_dir_out.stdout_lines[0] }}
     args:
       executable: cmd.exe
     when: become_test_username in profile_dir_out.stdout_lines[0]
+  
+  - name: ensure privileged test user profile is deleted
+    # NB: have to work around powershell limitation of long filenames until win_file fixes it
+    win_shell: rmdir /S /Q {{ admin_profile_dir_out.stdout_lines[0] }}
+    args:
+      executable: cmd.exe
+    when: become_test_admin_username in admin_profile_dir_out.stdout_lines[0]