// Copyright (c) 2006-2008 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 "sandbox/win/src/sync_interception.h"

#include "sandbox/win/src/crosscall_client.h"
#include "sandbox/win/src/ipc_tags.h"
#include "sandbox/win/src/policy_params.h"
#include "sandbox/win/src/policy_target.h"
#include "sandbox/win/src/sandbox_factory.h"
#include "sandbox/win/src/sandbox_nt_util.h"
#include "sandbox/win/src/sharedmem_ipc_client.h"
#include "sandbox/win/src/target_services.h"

namespace sandbox {

ResultCode ProxyCreateEvent(LPCWSTR name,
                            BOOL initial_state,
                            BOOL manual_reset,
                            CrossCallReturn* answer) {
  void* memory = GetGlobalIPCMemory();
  if (!memory)
    return SBOX_ERROR_GENERIC;

  CountedParameterSet<NameBased> params;
  params[NameBased::NAME] = ParamPickerMake(name);

  if (!QueryBroker(IPC_CREATEEVENT_TAG, params.GetBase()))
    return SBOX_ERROR_GENERIC;

  SharedMemIPCClient ipc(memory);
  ResultCode code = CrossCall(ipc, IPC_CREATEEVENT_TAG, name, manual_reset,
                              initial_state, answer);
  return code;
}

ResultCode ProxyOpenEvent(LPCWSTR name,
                          ACCESS_MASK desired_access,
                          BOOL inherit_handle,
                          CrossCallReturn* answer) {
  void* memory = GetGlobalIPCMemory();
  if (!memory)
    return SBOX_ERROR_GENERIC;

  uint32 inherit_handle_ipc = inherit_handle;
  CountedParameterSet<OpenEventParams> params;
  params[OpenEventParams::NAME] = ParamPickerMake(name);
  params[OpenEventParams::ACCESS] = ParamPickerMake(desired_access);

  if (!QueryBroker(IPC_OPENEVENT_TAG, params.GetBase()))
    return SBOX_ERROR_GENERIC;

  SharedMemIPCClient ipc(memory);
  ResultCode code = CrossCall(ipc, IPC_OPENEVENT_TAG, name, desired_access,
                              inherit_handle_ipc, answer);

  return code;
}

HANDLE WINAPI TargetCreateEventW(CreateEventWFunction orig_CreateEvent,
                                 LPSECURITY_ATTRIBUTES security_attributes,
                                 BOOL manual_reset,
                                 BOOL initial_state,
                                 LPCWSTR name) {
  // Check if the process can create it first.
  HANDLE handle = orig_CreateEvent(security_attributes, manual_reset,
                                   initial_state, name);
  if (handle || !name)
    return handle;

  DWORD original_error = ::GetLastError();

  // We don't trust that the IPC can work this early.
  if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
    return NULL;

  CrossCallReturn answer = {0};
  ResultCode code = ProxyCreateEvent(name, initial_state, manual_reset,
                                     &answer);

  if (code == SBOX_ALL_OK) {
    ::SetLastError(answer.win32_result);
    return answer.handle;
  }
  ::SetLastError(original_error);
  return NULL;
}

HANDLE WINAPI TargetCreateEventA(CreateEventAFunction orig_CreateEvent,
                                 LPSECURITY_ATTRIBUTES security_attributes,
                                 BOOL manual_reset,
                                 BOOL initial_state,
                                 LPCSTR name) {
  // Check if the process can create it first.
  HANDLE handle = orig_CreateEvent(security_attributes, manual_reset,
                                   initial_state, name);
  if (handle || !name)
    return handle;

  DWORD original_error = ::GetLastError();

  // We don't trust that the IPC can work this early.
  if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
    return NULL;

  UNICODE_STRING* wide_name = AnsiToUnicode(name);
  if (!wide_name)
    return NULL;

  CrossCallReturn answer = {0};
  ResultCode code = ProxyCreateEvent(wide_name->Buffer, initial_state,
                                     manual_reset, &answer);
  operator delete(wide_name, NT_ALLOC);

  if (code == SBOX_ALL_OK) {
    ::SetLastError(answer.win32_result);
    return answer.handle;
  }
  ::SetLastError(original_error);
  return NULL;
}

// Interception of OpenEventW on the child process.
// It should never be called directly
HANDLE WINAPI TargetOpenEventW(OpenEventWFunction orig_OpenEvent,
                               ACCESS_MASK desired_access,
                               BOOL inherit_handle,
                               LPCWSTR name) {
  // Check if the process can open it first.
  HANDLE handle = orig_OpenEvent(desired_access, inherit_handle, name);
  if (handle || !name)
    return handle;

  DWORD original_error = ::GetLastError();

  // We don't trust that the IPC can work this early.
  if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
    return NULL;

  CrossCallReturn answer = {0};

  ResultCode code = ProxyOpenEvent(name, desired_access, inherit_handle,
                                   &answer);
  if (code == SBOX_ALL_OK) {
    ::SetLastError(answer.win32_result);
    return answer.handle;
  }
  ::SetLastError(original_error);
  return NULL;
}

HANDLE WINAPI TargetOpenEventA(OpenEventAFunction orig_OpenEvent,
                               ACCESS_MASK desired_access,
                               BOOL inherit_handle,
                               LPCSTR name) {
  // Check if the process can open it first.
  HANDLE handle = orig_OpenEvent(desired_access, inherit_handle, name);
  if (handle || !name)
    return handle;

  DWORD original_error = ::GetLastError();

  // We don't trust that the IPC can work this early.
  if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
    return NULL;

  UNICODE_STRING* wide_name = AnsiToUnicode(name);
  if (!wide_name)
    return NULL;

  CrossCallReturn answer = {0};
  ResultCode code = ProxyOpenEvent(wide_name->Buffer, desired_access,
                                   inherit_handle, &answer);
  operator delete(wide_name, NT_ALLOC);

  if (code == SBOX_ALL_OK) {
    ::SetLastError(answer.win32_result);
    return answer.handle;
  }
  ::SetLastError(original_error);
  return NULL;
}

}  // namespace sandbox