Removing WinXP and Vista specific code from Chromoting.

remoting/host/win/launch_process_with_token.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/host/win/launch_process_with_token.h"
 
 #include <windows.h>
-#include <stddef.h>
-#include <winternl.h>
 
-#include <limits>
-#include <memory>
 #include <utility>
 
 #include "base/logging.h"
-#include "base/rand_util.h"
-#include "base/scoped_native_library.h"
-#include "base/strings/string16.h"
-#include "base/strings/stringprintf.h"
-#include "base/strings/utf_string_conversions.h"
 #include "base/win/scoped_handle.h"
 #include "base/win/scoped_process_information.h"
-#include "base/win/windows_version.h"
 
 using base::win::ScopedHandle;
 
 namespace {
 
-const char kCreateProcessDefaultPipeNameFormat[] =
-    "\\\\.\\Pipe\\TerminalServer\\SystemExecSrvr\\%d";
-
-// Undocumented WINSTATIONINFOCLASS value causing
-// winsta!WinStationQueryInformationW() to return the name of the pipe for
-// requesting cross-session process creation.
-const WINSTATIONINFOCLASS kCreateProcessPipeNameClass =
-    static_cast<WINSTATIONINFOCLASS>(0x21);
-
-const int kPipeBusyWaitTimeoutMs = 2000;
-const int kPipeConnectMaxAttempts = 3;
-
-// Terminates the process and closes process and thread handles in
-// |process_information| structure.
-void CloseHandlesAndTerminateProcess(PROCESS_INFORMATION* process_information) {
-  if (process_information->hThread) {
-    CloseHandle(process_information->hThread);
-    process_information->hThread = nullptr;
-  }
-
-  if (process_information->hProcess) {
-    TerminateProcess(process_information->hProcess, CONTROL_C_EXIT);
-    CloseHandle(process_information->hProcess);
-    process_information->hProcess = nullptr;
-  }
-}
-
-// Connects to the executor server corresponding to |session_id|.
-bool ConnectToExecutionServer(uint32_t session_id,
-                              base::win::ScopedHandle* pipe_out) {
-  base::string16 pipe_name;
-
-  // Use winsta!WinStationQueryInformationW() to determine the process creation
-  // pipe name for the session.
-  base::FilePath winsta_path(
-      base::GetNativeLibraryName(base::UTF8ToUTF16("winsta")));
-  base::ScopedNativeLibrary winsta(winsta_path);
-  if (winsta.is_valid()) {
-    PWINSTATIONQUERYINFORMATIONW win_station_query_information =
-        reinterpret_cast<PWINSTATIONQUERYINFORMATIONW>(
-            winsta.GetFunctionPointer("WinStationQueryInformationW"));
-    if (win_station_query_information) {
-      wchar_t name[MAX_PATH];
-      ULONG name_length;
-      if (win_station_query_information(0,
-                                        session_id,
-                                        kCreateProcessPipeNameClass,
-                                        name,
-                                        sizeof(name),
-                                        &name_length)) {
-        pipe_name.assign(name);
-      }
-    }
-  }
-
-  // Use the default pipe name if we couldn't query its name.
-  if (pipe_name.empty()) {
-    pipe_name = base::UTF8ToUTF16(
-        base::StringPrintf(kCreateProcessDefaultPipeNameFormat, session_id));
-  }
-
-  // Try to connect to the named pipe.
-  base::win::ScopedHandle pipe;
-  for (int i = 0; i < kPipeConnectMaxAttempts; ++i) {
-    pipe.Set(CreateFile(pipe_name.c_str(),
-                        GENERIC_READ | GENERIC_WRITE,
-                        0,
-                        nullptr,
-                        OPEN_EXISTING,
-                        0,
-                        nullptr));
-    if (pipe.IsValid()) {
-      break;
-    }
-
-    // Cannot continue retrying if error is something other than
-    // ERROR_PIPE_BUSY.
-    if (GetLastError() != ERROR_PIPE_BUSY) {
-      break;
-    }
-
-    // Cannot continue retrying if wait on pipe fails.
-    if (!WaitNamedPipe(pipe_name.c_str(), kPipeBusyWaitTimeoutMs)) {
-      break;
-    }
-  }
-
-  if (!pipe.IsValid()) {
-    PLOG(ERROR) << "Failed to connect to '" << pipe_name << "'";
-    return false;
-  }
-
-  *pipe_out = std::move(pipe);
-  return true;
-}
-
 // Copies the process token making it a primary impersonation token.
 // The returned handle will have |desired_access| rights.
 bool CopyProcessToken(DWORD desired_access, ScopedHandle* token_out) {
   HANDLE temp_handle;
   if (!OpenProcessToken(GetCurrentProcess(),
                         TOKEN_DUPLICATE | desired_access,
                         &temp_handle)) {
     PLOG(ERROR) << "Failed to open process token";
     return false;
   }
@@ skipping 35 matching lines @@
   if (!AdjustTokenPrivileges(privileged_token.Get(), FALSE, &state, 0, nullptr,
                              0)) {
     PLOG(ERROR) << "Failed to enable SE_TCB_NAME privilege in a token";
     return false;
   }
 
   *token_out = std::move(privileged_token);
   return true;
 }
 
-// Fills the process and thread handles in the passed |process_information|
-// structure and resume the process if the caller didn't want to suspend it.
-bool ProcessCreateProcessResponse(DWORD creation_flags,
-                                  PROCESS_INFORMATION* process_information) {
-  // The execution server does not return handles to the created process and
-  // thread.
-  if (!process_information->hProcess) {
-    // N.B. PROCESS_ALL_ACCESS is different in XP and Vista+ versions of
-    // the SDK. |desired_access| below is effectively PROCESS_ALL_ACCESS from
-    // the XP version of the SDK.
-    DWORD desired_access =
-        STANDARD_RIGHTS_REQUIRED |
-        SYNCHRONIZE |
-        PROCESS_TERMINATE |
-        PROCESS_CREATE_THREAD |
-        PROCESS_SET_SESSIONID |
-        PROCESS_VM_OPERATION |
-        PROCESS_VM_READ |
-        PROCESS_VM_WRITE |
-        PROCESS_DUP_HANDLE |
-        PROCESS_CREATE_PROCESS |
-        PROCESS_SET_QUOTA |
-        PROCESS_SET_INFORMATION |
-        PROCESS_QUERY_INFORMATION |
-        PROCESS_SUSPEND_RESUME;
-    process_information->hProcess =
-        OpenProcess(desired_access,
-                    FALSE,
-                    process_information->dwProcessId);
-    if (!process_information->hProcess) {
-      PLOG(ERROR) << "Failed to open the process "
-                  << process_information->dwProcessId;
-      return false;
-    }
-  }
-
-  if (!process_information->hThread) {
-    // N.B. THREAD_ALL_ACCESS is different in XP and Vista+ versions of
-    // the SDK. |desired_access| below is effectively THREAD_ALL_ACCESS from
-    // the XP version of the SDK.
-    DWORD desired_access =
-        STANDARD_RIGHTS_REQUIRED |
-        SYNCHRONIZE |
-        THREAD_TERMINATE |
-        THREAD_SUSPEND_RESUME |
-        THREAD_GET_CONTEXT |
-        THREAD_SET_CONTEXT |
-        THREAD_QUERY_INFORMATION |
-        THREAD_SET_INFORMATION |
-        THREAD_SET_THREAD_TOKEN |
-        THREAD_IMPERSONATE |
-        THREAD_DIRECT_IMPERSONATION;
-    process_information->hThread =
-        OpenThread(desired_access,
-                   FALSE,
-                   process_information->dwThreadId);
-    if (!process_information->hThread) {
-      PLOG(ERROR) << "Failed to open the thread "
-                  << process_information->dwThreadId;
-      return false;
-    }
-  }
-
-  // Resume the thread if the caller didn't want to suspend the process.
-  if ((creation_flags & CREATE_SUSPENDED) == 0) {
-    if (!ResumeThread(process_information->hThread)) {
-      PLOG(ERROR) << "Failed to resume the thread "
-                  << process_information->dwThreadId;
-      return false;
-    }
-  }
-
-  return true;
-}
-
-// Receives the response to a remote process create request.
-bool ReceiveCreateProcessResponse(
-    HANDLE pipe,
-    PROCESS_INFORMATION* process_information_out) {
-  struct CreateProcessResponse {
-    DWORD size;
-    BOOL success;
-    DWORD last_error;
-    PROCESS_INFORMATION process_information;
-  };
-
-  DWORD bytes;
-  CreateProcessResponse response;
-  if (!ReadFile(pipe, &response, sizeof(response), &bytes, nullptr)) {
-    PLOG(ERROR) << "Failed to receive CreateProcessAsUser response";
-    return false;
-  }
-
-  // The server sends the data in one chunk so if we didn't received a complete
-  // answer something bad happend and there is no point in retrying.
-  if (bytes != sizeof(response)) {
-    SetLastError(ERROR_RECEIVE_PARTIAL);
-    return false;
-  }
-
-  if (!response.success) {
-    SetLastError(response.last_error);
-    return false;
-  }
-
-  *process_information_out = response.process_information;
-  return true;
-}
-
-// Sends a remote process create request to the execution server.
-bool SendCreateProcessRequest(
-    HANDLE pipe,
-    const base::FilePath::StringType& application_name,
-    const base::CommandLine::StringType& command_line,
-    DWORD creation_flags,
-    const base::char16* desktop_name) {
-  // |CreateProcessRequest| structure passes the same parameters to
-  // the execution server as CreateProcessAsUser() function does. Strings are
-  // stored as wide strings immediately after the structure. String pointers are
-  // represented as byte offsets to string data from the beginning of
-  // the structure.
-  struct CreateProcessRequest {
-    DWORD size;
-    DWORD process_id;
-    BOOL use_default_token;
-    HANDLE token;
-    LPWSTR application_name;
-    LPWSTR command_line;
-    SECURITY_ATTRIBUTES process_attributes;
-    SECURITY_ATTRIBUTES thread_attributes;
-    BOOL inherit_handles;
-    DWORD creation_flags;
-    LPVOID environment;
-    LPWSTR current_directory;
-    STARTUPINFOW startup_info;
-    PROCESS_INFORMATION process_information;
-  };
-
-  base::string16 desktop;
-  if (desktop_name)
-    desktop = desktop_name;
-
-  // Allocate a large enough buffer to hold the CreateProcessRequest structure
-  // and three nullptr-terminated string parameters.
-  size_t size = sizeof(CreateProcessRequest) + sizeof(wchar_t) *
-      (application_name.size() + command_line.size() + desktop.size() + 3);
-  std::unique_ptr<char[]> buffer(new char[size]);
-  memset(buffer.get(), 0, size);
-
-  // Marshal the input parameters.
-  CreateProcessRequest* request =
-      reinterpret_cast<CreateProcessRequest*>(buffer.get());
-  request->size = size;
-  request->process_id = GetCurrentProcessId();
-  request->use_default_token = TRUE;
-  // Always pass CREATE_SUSPENDED to avoid a race between the created process
-  // exiting too soon and OpenProcess() call below.
-  request->creation_flags = creation_flags | CREATE_SUSPENDED;
-  request->startup_info.cb = sizeof(request->startup_info);
-
-  size_t buffer_offset = sizeof(CreateProcessRequest);
-
-  request->application_name = reinterpret_cast<LPWSTR>(buffer_offset);
-  std::copy(application_name.begin(),
-            application_name.end(),
-            reinterpret_cast<wchar_t*>(buffer.get() + buffer_offset));
-  buffer_offset += (application_name.size() + 1) * sizeof(wchar_t);
-
-  request->command_line = reinterpret_cast<LPWSTR>(buffer_offset);
-  std::copy(command_line.begin(),
-            command_line.end(),
-            reinterpret_cast<wchar_t*>(buffer.get() + buffer_offset));
-  buffer_offset += (command_line.size() + 1) * sizeof(wchar_t);
-
-  request->startup_info.lpDesktop =
-      reinterpret_cast<LPWSTR>(buffer_offset);
-  std::copy(desktop.begin(),
-            desktop.end(),
-            reinterpret_cast<wchar_t*>(buffer.get() + buffer_offset));
-
-  // Pass the request to create a process in the target session.
-  DWORD bytes;
-  if (!WriteFile(pipe, buffer.get(), size, &bytes, nullptr)) {
-    PLOG(ERROR) << "Failed to send CreateProcessAsUser request";
-    return false;
-  }
-
-  return true;
-}
-
-// Requests the execution server to create a process in the specified session
-// using the default (i.e. Winlogon) token. This routine relies on undocumented
-// OS functionality and will likely not work on anything but XP or W2K3.
-bool CreateRemoteSessionProcess(
-    uint32_t session_id,
-    const base::FilePath::StringType& application_name,
-    const base::CommandLine::StringType& command_line,
-    DWORD creation_flags,
-    const base::char16* desktop_name,
-    PROCESS_INFORMATION* process_information_out) {
-  DCHECK_LT(base::win::GetVersion(), base::win::VERSION_VISTA);
-
-  base::win::ScopedHandle pipe;
-  if (!ConnectToExecutionServer(session_id, &pipe))
-    return false;
-
-  if (!SendCreateProcessRequest(pipe.Get(), application_name, command_line,
-                                creation_flags, desktop_name)) {
-    return false;
-  }
-
-  PROCESS_INFORMATION process_information;
-  if (!ReceiveCreateProcessResponse(pipe.Get(), &process_information))
-    return false;
-
-  if (!ProcessCreateProcessResponse(creation_flags, &process_information)) {
-    CloseHandlesAndTerminateProcess(&process_information);
-    return false;
-  }
-
-  *process_information_out = process_information;
-  return true;
-}
-
 }  // namespace
 
 namespace remoting {
 
 base::LazyInstance<base::Lock>::Leaky g_inherit_handles_lock =
     LAZY_INSTANCE_INITIALIZER;
 
 // Creates a copy of the current process token for the given |session_id| so
 // it can be used to launch a process in that session.
 bool CreateSessionToken(uint32_t session_id, ScopedHandle* token_out) {
@@ skipping 59 matching lines @@
                                     const_cast<LPWSTR>(command_line.c_str()),
                                     process_attributes,
                                     thread_attributes,
                                     inherit_handles,
                                     creation_flags,
                                     nullptr,
                                     nullptr,
                                     &startup_info,
                                     &temp_process_info);
 
-  // CreateProcessAsUser will fail on XP and W2K3 with ERROR_PIPE_NOT_CONNECTED
-  // if the user hasn't logged to the target session yet. In such a case
-  // we try to talk to the execution server directly emulating what
-  // the undocumented and not-exported advapi32!CreateRemoteSessionProcessW()
-  // function does. The created process will run under Winlogon'a token instead
-  // of |user_token|. Since Winlogon runs as SYSTEM, this suits our needs.
-  if (!result &&
-      GetLastError() == ERROR_PIPE_NOT_CONNECTED &&
-      base::win::GetVersion() < base::win::VERSION_VISTA) {
-    DWORD session_id;
-    DWORD return_length;
-    result = GetTokenInformation(user_token,
-                                 TokenSessionId,
-                                 &session_id,
-                                 sizeof(session_id),
-                                 &return_length);
-    if (result && session_id != 0) {
-      result = CreateRemoteSessionProcess(session_id,
-                                          application_name,
-                                          command_line,
-                                          creation_flags,
-                                          desktop_name,
-                                          &temp_process_info);
-    } else {
-      // Restore the error status returned by CreateProcessAsUser().
-      result = FALSE;
-      SetLastError(ERROR_PIPE_NOT_CONNECTED);
-    }
-  }
-
   if (!result) {
     PLOG(ERROR) << "Failed to launch a process with a user token";
     return false;
   }
 
   base::win::ScopedProcessInformation process_info(temp_process_info);
 
   CHECK(process_info.IsValid());
   process_out->Set(process_info.TakeProcessHandle());
   thread_out->Set(process_info.TakeThreadHandle());
   return true;
 }
 
 }  // namespace remoting