sandbox/win/src/handle_dispatcher.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "sandbox/win/src/handle_dispatcher.h"
   6
   7 #include "base/win/scoped_handle.h"
   8 #include "sandbox/win/src/handle_interception.h"
   9 #include "sandbox/win/src/handle_policy.h"
  10 #include "sandbox/win/src/ipc_tags.h"
  11 #include "sandbox/win/src/policy_broker.h"
  12 #include "sandbox/win/src/policy_params.h"
  13 #include "sandbox/win/src/sandbox.h"
  14 #include "sandbox/win/src/sandbox_nt_util.h"
  15 #include "sandbox/win/src/sandbox_types.h"
  16 #include "sandbox/win/src/sandbox_utils.h"
  17
  18 namespace sandbox {
  19
  20 HandleDispatcher::HandleDispatcher(PolicyBase* policy_base)
  21     : policy_base_(policy_base) {
  22   static const IPCCall duplicate_handle_proxy = {
  23     {IPC_DUPLICATEHANDLEPROXY_TAG, VOIDPTR_TYPE, ULONG_TYPE, ULONG_TYPE,
  24      ULONG_TYPE},
  25     reinterpret_cast<CallbackGeneric>(&HandleDispatcher::DuplicateHandleProxy)
  26   };
  27
  28   ipc_calls_.push_back(duplicate_handle_proxy);
  29 }
  30
  31 bool HandleDispatcher::SetupService(InterceptionManager* manager,
  32                                     int service) {
  33   // We perform no interceptions for handles right now.
  34   switch (service) {
  35     case IPC_DUPLICATEHANDLEPROXY_TAG:
  36     return true;
  37   }
  38
  39   return false;
  40 }
  41
  42 bool HandleDispatcher::DuplicateHandleProxy(IPCInfo* ipc,
  43                                             HANDLE source_handle,
  44                                             DWORD target_process_id,
  45                                             DWORD desired_access,
  46                                             DWORD options) {
  47   NTSTATUS error;
  48   static NtQueryObject QueryObject = NULL;
  49   if (!QueryObject)
  50     ResolveNTFunctionPtr("NtQueryObject", &QueryObject);
  51
  52   // Get a copy of the handle for use in the broker process.
  53   HANDLE handle_temp;
  54   if (!::DuplicateHandle(ipc->client_info->process, source_handle,
  55                          ::GetCurrentProcess(), &handle_temp,
  56                          0, FALSE, DUPLICATE_SAME_ACCESS)) {
  57     ipc->return_info.win32_result = ::GetLastError();
  58     return false;
  59   }
  60   base::win::ScopedHandle handle(handle_temp);
  61
  62   // Get the object type (32 characters is safe; current max is 14).
  63   BYTE buffer[sizeof(OBJECT_TYPE_INFORMATION) + 32 * sizeof(wchar_t)];
  64   OBJECT_TYPE_INFORMATION* type_info =
  65       reinterpret_cast<OBJECT_TYPE_INFORMATION*>(buffer);
  66   ULONG size = sizeof(buffer) - sizeof(wchar_t);
  67   error = QueryObject(handle, ObjectTypeInformation, type_info, size, &size);
  68   if (!NT_SUCCESS(error)) {
  69     ipc->return_info.win32_result = error;
  70     return false;
  71   }
  72   type_info->Name.Buffer[type_info->Name.Length / sizeof(wchar_t)] = L'\0';
  73
  74   CountedParameterSet<HandleTarget> params;
  75   params[HandleTarget::NAME] = ParamPickerMake(type_info->Name.Buffer);
  76   params[HandleTarget::TARGET] = ParamPickerMake(target_process_id);
  77
  78   EvalResult eval = policy_base_->EvalPolicy(IPC_DUPLICATEHANDLEPROXY_TAG,
  79                                              params.GetBase());
  80   ipc->return_info.win32_result =
  81       HandlePolicy::DuplicateHandleProxyAction(eval, *ipc->client_info,
  82                                                source_handle,
  83                                                target_process_id,
  84                                                &ipc->return_info.handle,
  85                                                desired_access, options);
  86   return true;
  87 }
  88
  89 }  // namespace sandbox
  90