sandbox/win/src/sync_interception.cc

   1 // Copyright (c) 2006-2008 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/sync_interception.h"
   6
   7 #include "sandbox/win/src/crosscall_client.h"
   8 #include "sandbox/win/src/ipc_tags.h"
   9 #include "sandbox/win/src/policy_params.h"
  10 #include "sandbox/win/src/policy_target.h"
  11 #include "sandbox/win/src/sandbox_factory.h"
  12 #include "sandbox/win/src/sandbox_nt_util.h"
  13 #include "sandbox/win/src/sharedmem_ipc_client.h"
  14 #include "sandbox/win/src/target_services.h"
  15
  16 namespace sandbox {
  17
  18 ResultCode ProxyCreateEvent(LPCWSTR name,
  19                             BOOL initial_state,
  20                             EVENT_TYPE event_type,
  21                             void* ipc_memory,
  22                             CrossCallReturn* answer) {
  23   CountedParameterSet<NameBased> params;
  24   params[NameBased::NAME] = ParamPickerMake(name);
  25
  26   if (!QueryBroker(IPC_CREATEEVENT_TAG, params.GetBase()))
  27     return SBOX_ERROR_GENERIC;
  28
  29   SharedMemIPCClient ipc(ipc_memory);
  30   ResultCode code = CrossCall(ipc, IPC_CREATEEVENT_TAG, name, event_type,
  31                               initial_state, answer);
  32   return code;
  33 }
  34
  35 ResultCode ProxyOpenEvent(LPCWSTR name,
  36                           ACCESS_MASK desired_access,
  37                           void* ipc_memory,
  38                           CrossCallReturn* answer) {
  39   CountedParameterSet<OpenEventParams> params;
  40   params[OpenEventParams::NAME] = ParamPickerMake(name);
  41   params[OpenEventParams::ACCESS] = ParamPickerMake(desired_access);
  42
  43   if (!QueryBroker(IPC_OPENEVENT_TAG, params.GetBase()))
  44     return SBOX_ERROR_GENERIC;
  45
  46   SharedMemIPCClient ipc(ipc_memory);
  47   ResultCode code = CrossCall(ipc, IPC_OPENEVENT_TAG, name, desired_access,
  48                               answer);
  49
  50   return code;
  51 }
  52
  53 NTSTATUS WINAPI TargetNtCreateEvent(NtCreateEventFunction orig_CreateEvent,
  54                                     PHANDLE event_handle,
  55                                     ACCESS_MASK desired_access,
  56                                     POBJECT_ATTRIBUTES object_attributes,
  57                                     EVENT_TYPE event_type,
  58                                     BOOLEAN initial_state) {
  59   NTSTATUS status = orig_CreateEvent(event_handle, desired_access,
  60                                      object_attributes, event_type,
  61                                      initial_state);
  62   if (status != STATUS_ACCESS_DENIED || !object_attributes)
  63     return status;
  64
  65   // We don't trust that the IPC can work this early.
  66   if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
  67     return status;
  68
  69   do {
  70     if (!ValidParameter(event_handle, sizeof(HANDLE), WRITE))
  71       break;
  72
  73     void* memory = GetGlobalIPCMemory();
  74     if (memory == NULL)
  75       break;
  76
  77     OBJECT_ATTRIBUTES object_attribs_copy = *object_attributes;
  78     // The RootDirectory points to BaseNamedObjects. We can ignore it.
  79     object_attribs_copy.RootDirectory = NULL;
  80
  81     wchar_t* name = NULL;
  82     uint32 attributes = 0;
  83     NTSTATUS ret = AllocAndCopyName(&object_attribs_copy, &name, &attributes,
  84                                     NULL);
  85     if (!NT_SUCCESS(ret) || name == NULL)
  86       break;
  87
  88     CrossCallReturn answer = {0};
  89     answer.nt_status = status;
  90     ResultCode code = ProxyCreateEvent(name, initial_state, event_type, memory,
  91                                        &answer);
  92     operator delete(name, NT_ALLOC);
  93
  94     if (code != SBOX_ALL_OK) {
  95       status = answer.nt_status;
  96       break;
  97     }
  98     __try {
  99       *event_handle = answer.handle;
 100       status = STATUS_SUCCESS;
 101     } __except(EXCEPTION_EXECUTE_HANDLER) {
 102       break;
 103     }
 104   } while (false);
 105
 106   return status;
 107 }
 108
 109 NTSTATUS WINAPI TargetNtOpenEvent(NtOpenEventFunction orig_OpenEvent,
 110                                   PHANDLE event_handle,
 111                                   ACCESS_MASK desired_access,
 112                                   POBJECT_ATTRIBUTES object_attributes) {
 113   NTSTATUS status = orig_OpenEvent(event_handle, desired_access,
 114                                    object_attributes);
 115   if (status != STATUS_ACCESS_DENIED || !object_attributes)
 116     return status;
 117
 118   // We don't trust that the IPC can work this early.
 119   if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
 120     return status;
 121
 122   do {
 123     if (!ValidParameter(event_handle, sizeof(HANDLE), WRITE))
 124       break;
 125
 126     void* memory = GetGlobalIPCMemory();
 127     if (memory == NULL)
 128       break;
 129
 130     OBJECT_ATTRIBUTES object_attribs_copy = *object_attributes;
 131     // The RootDirectory points to BaseNamedObjects. We can ignore it.
 132     object_attribs_copy.RootDirectory = NULL;
 133
 134     wchar_t* name = NULL;
 135     uint32 attributes = 0;
 136     NTSTATUS ret = AllocAndCopyName(&object_attribs_copy, &name, &attributes,
 137                                     NULL);
 138     if (!NT_SUCCESS(ret) || name == NULL)
 139       break;
 140
 141     CrossCallReturn answer = {0};
 142     answer.nt_status = status;
 143     ResultCode code = ProxyOpenEvent(name, desired_access, memory, &answer);
 144     operator delete(name, NT_ALLOC);
 145
 146     if (code != SBOX_ALL_OK) {
 147       status = answer.nt_status;
 148       break;
 149     }
 150     __try {
 151       *event_handle = answer.handle;
 152       status = STATUS_SUCCESS;
 153     } __except(EXCEPTION_EXECUTE_HANDLER) {
 154       break;
 155     }
 156   } while (false);
 157
 158   return status;
 159 }
 160
 161 }  // namespace sandbox