Implement sandbox hooks to forward OPM related GDI system calls.

sandbox/win/src/process_mitigations_win32k_policy.cc

 // Copyright 2014 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 <stddef.h>
+
+#include "sandbox/win/src/process_mitigations_win32k_interception.h"
 #include "sandbox/win/src/process_mitigations_win32k_policy.h"
 
 namespace sandbox {
 
+namespace {
+
+// Define GUIDs for OPM APIs
+const GUID DXGKMDT_OPM_GET_CONNECTOR_TYPE = {
+    0x81d0bfd5,
+    0x6afe,
+    0x48c2,
+    {0x99, 0xc0, 0x95, 0xa0, 0x8f, 0x97, 0xc5, 0xda}};
+const GUID DXGKMDT_OPM_GET_SUPPORTED_PROTECTION_TYPES = {
+    0x38f2a801,
+    0x9a6c,
+    0x48bb,
+    {0x91, 0x07, 0xb6, 0x69, 0x6e, 0x6f, 0x17, 0x97}};
+const GUID DXGKMDT_OPM_GET_VIRTUAL_PROTECTION_LEVEL = {
+    0xb2075857,
+    0x3eda,
+    0x4d5d,
+    {0x88, 0xdb, 0x74, 0x8f, 0x8c, 0x1a, 0x05, 0x49}};
+const GUID DXGKMDT_OPM_GET_ACTUAL_PROTECTION_LEVEL = {
+    0x1957210a,
+    0x7766,
+    0x452a,
+    {0xb9, 0x9a, 0xd2, 0x7a, 0xed, 0x54, 0xf0, 0x3a}};
+const GUID DXGKMDT_OPM_SET_PROTECTION_LEVEL = {
+    0x9bb9327c,
+    0x4eb5,
+    0x4727,
+    {0x9f, 0x00, 0xb4, 0x2b, 0x09, 0x19, 0xc0, 0xda}};
+
+void StringToUnicodeString(PUNICODE_STRING unicode_string,
+                           const base::string16& device_name) {
+  static RtlInitUnicodeStringFunction RtlInitUnicodeString;
+  if (!RtlInitUnicodeString) {
+    HMODULE ntdll = ::GetModuleHandle(kNtdllName);
+    RtlInitUnicodeString = reinterpret_cast<RtlInitUnicodeStringFunction>(
+        GetProcAddress(ntdll, "RtlInitUnicodeString"));
+    DCHECK(!!RtlInitUnicodeString);
+  }
+  RtlInitUnicodeString(unicode_string, device_name.c_str());
+}
+
+struct MonitorListState {
+  HMONITOR* monitor_list;
+  uint32_t monitor_list_size;
+  uint32_t monitor_list_pos;
+};
+
+BOOL CALLBACK DisplayMonitorEnumProc(HMONITOR monitor,
+                                     HDC hdc_monitor,
+                                     LPRECT rect_monitor,
+                                     LPARAM data) {
+  MonitorListState* state = reinterpret_cast<MonitorListState*>(data);
+  if (state->monitor_list_pos >= state->monitor_list_size)
+    return FALSE;
+  state->monitor_list[state->monitor_list_pos++] = monitor;
+  return TRUE;
+}
+
+template <typename T>
+T GetGdi32Func(const char* name) {
+  static T func = nullptr;
+  if (!func) {
+    func = reinterpret_cast<T>(
+        ::GetProcAddress(::GetModuleHandle(L"gdi32.dll"), name));
+    DCHECK(!!func);
+  }
+  return func;
+}
+
+#define GDIFUNC(name) GetGdi32Func<name##Function>(#name)
+
+}  // namespace
+
 bool ProcessMitigationsWin32KLockdownPolicy::GenerateRules(
     const wchar_t* name,
     TargetPolicy::Semantics semantics,
     LowLevelPolicy* policy) {
   PolicyRule rule(FAKE_SUCCESS);
   if (!policy->AddRule(IPC_GDI_GDIDLLINITIALIZE_TAG, &rule))
     return false;
   if (!policy->AddRule(IPC_GDI_GETSTOCKOBJECT_TAG, &rule))
     return false;
   if (!policy->AddRule(IPC_USER_REGISTERCLASSW_TAG, &rule))
     return false;
+  if (semantics != TargetPolicy::IMPLEMENT_OPM_APIS)
+    return true;
+  if (!policy->AddRule(IPC_USER_ENUMDISPLAYMONITORS_TAG, &rule))
+    return false;
+  if (!policy->AddRule(IPC_USER_ENUMDISPLAYDEVICES_TAG, &rule))
+    return false;
+  if (!policy->AddRule(IPC_USER_GETMONITORINFO_TAG, &rule))
+    return false;
+  if (!policy->AddRule(IPC_GDI_CREATEOPMPROTECTEDOUTPUTS_TAG, &rule))
+    return false;
+  if (!policy->AddRule(IPC_GDI_GETCERTIFICATE_TAG, &rule))
+    return false;
+  if (!policy->AddRule(IPC_GDI_GETCERTIFICATESIZE_TAG, &rule))
+    return false;
+  if (!policy->AddRule(IPC_GDI_DESTROYOPMPROTECTEDOUTPUT_TAG, &rule))
+    return false;
+  if (!policy->AddRule(IPC_GDI_CONFIGUREOPMPROTECTEDOUTPUT_TAG, &rule))
+    return false;
+  if (!policy->AddRule(IPC_GDI_GETOPMINFORMATION_TAG, &rule))
+    return false;
+  if (!policy->AddRule(IPC_GDI_GETOPMRANDOMNUMBER_TAG, &rule))
+    return false;
+  if (!policy->AddRule(IPC_GDI_GETSUGGESTEDOPMPROTECTEDOUTPUTARRAYSIZE_TAG,
+                       &rule))
+    return false;
+  if (!policy->AddRule(IPC_GDI_SETOPMSIGNINGKEYANDSEQUENCENUMBERS_TAG, &rule))
+    return false;
   return true;
 }
 
+uint32_t ProcessMitigationsWin32KLockdownPolicy::EnumDisplayMonitorsAction(
+    const ClientInfo& client_info,
+    HMONITOR* monitor_list,
+    uint32_t monitor_list_size) {
+  MonitorListState state = {monitor_list, monitor_list_size, 0};
+  EnumDisplayMonitors(nullptr, nullptr, DisplayMonitorEnumProc,
+                      reinterpret_cast<LPARAM>(&state));
+  return state.monitor_list_pos;
+}
+
+NTSTATUS ProcessMitigationsWin32KLockdownPolicy::
+    GetSuggestedOPMProtectedOutputArraySizeAction(
+        const ClientInfo& client_info,
+        const base::string16& device_name,
+        uint32_t* suggested_array_size) {
+  UNICODE_STRING unicode_device_name;
+  StringToUnicodeString(&unicode_device_name, device_name);
+  return GDIFUNC(GetSuggestedOPMProtectedOutputArraySize)(
+      &unicode_device_name, reinterpret_cast<DWORD*>(suggested_array_size));
+}
+
+NTSTATUS
+ProcessMitigationsWin32KLockdownPolicy::CreateOPMProtectedOutputsAction(
+    const ClientInfo& client_info,
+    const base::string16& device_name,
+    HANDLE* protected_outputs,
+    uint32_t array_input_size,
+    uint32_t* array_output_size) {
+  UNICODE_STRING unicode_device_name;
+  StringToUnicodeString(&unicode_device_name, device_name);
+  DWORD output_size = 0;
+
+  NTSTATUS status = GDIFUNC(CreateOPMProtectedOutputs)(
+      &unicode_device_name, DXGKMDT_OPM_VOS_OPM_SEMANTICS, array_input_size,
+      &output_size,
+      reinterpret_cast<OPM_PROTECTED_OUTPUT_HANDLE*>(protected_outputs));
+  if (!status)
+    *array_output_size = output_size;
+  return status;
+}
+
+NTSTATUS ProcessMitigationsWin32KLockdownPolicy::GetCertificateSizeAction(
+    const ClientInfo& client_info,
+    const base::string16& device_name,
+    uint32_t* cert_size) {
+  UNICODE_STRING unicode_device_name;
+  StringToUnicodeString(&unicode_device_name, device_name);
+
+  return GDIFUNC(GetCertificateSize)(&unicode_device_name,
+                                     DXGKMDT_OPM_CERTIFICATE,
+                                     reinterpret_cast<DWORD*>(cert_size));
+}
+
+NTSTATUS ProcessMitigationsWin32KLockdownPolicy::GetCertificateAction(
+    const ClientInfo& client_info,
+    const base::string16& device_name,
+    BYTE* cert_data,
+    uint32_t cert_size) {
+  UNICODE_STRING unicode_device_name;
+  StringToUnicodeString(&unicode_device_name, device_name);
+
+  return GDIFUNC(GetCertificate)(&unicode_device_name, DXGKMDT_OPM_CERTIFICATE,
+                                 cert_data, cert_size);
+}
+
+NTSTATUS ProcessMitigationsWin32KLockdownPolicy::GetOPMRandomNumberAction(
+    const ClientInfo& client_info,
+    HANDLE protected_output,
+    void* random_number) {
+  return GDIFUNC(GetOPMRandomNumber)(
+      protected_output, static_cast<DXGKMDT_OPM_RANDOM_NUMBER*>(random_number));

[Will Harris, 2016/04/05 03:49:02]

reinterpret_cast

[Will Harris, 2016/04/11 21:23:02]

actually static_cast here is fine.

+}
+
+NTSTATUS ProcessMitigationsWin32KLockdownPolicy::
+    SetOPMSigningKeyAndSequenceNumbersAction(const ClientInfo& client_info,
+                                             HANDLE protected_output,
+                                             void* parameters) {
+  return GDIFUNC(SetOPMSigningKeyAndSequenceNumbers)(
+      protected_output,
+      static_cast<DXGKMDT_OPM_ENCRYPTED_PARAMETERS*>(parameters));
+}
+
+NTSTATUS
+ProcessMitigationsWin32KLockdownPolicy::ConfigureOPMProtectedOutputAction(
+    const ClientInfo& client_info,
+    HANDLE protected_output,
+    void* parameters) {
+  DXGKMDT_OPM_CONFIGURE_PARAMETERS config;
+  memcpy(&config, parameters, sizeof(DXGKMDT_OPM_CONFIGURE_PARAMETERS));
+  if (config.guidSetting != DXGKMDT_OPM_SET_PROTECTION_LEVEL ||
+      config.cbParametersSize !=
+          sizeof(DXGKMDT_OPM_SET_PROTECTION_LEVEL_PARAMETERS)) {
+    return STATUS_INVALID_PARAMETER;
+  }
+
+  DXGKMDT_OPM_SET_PROTECTION_LEVEL_PARAMETERS params;
+  memcpy(&params, config.abParameters,
+         sizeof(DXGKMDT_OPM_SET_PROTECTION_LEVEL_PARAMETERS));
+  if (params.Reserved || params.Reserved2)
+    return STATUS_INVALID_PARAMETER;
+
+  if (params.ulProtectionType != DXGKMDT_OPM_PROTECTION_TYPE_HDCP &&
+      params.ulProtectionType != DXGKMDT_OPM_PROTECTION_TYPE_DPCP) {
+    return STATUS_INVALID_PARAMETER;
+  }
+
+  // Protection levels are same for HDCP and DPCP.
+  if (params.ulProtectionLevel != DXGKMDT_OPM_HDCP_OFF &&
+      params.ulProtectionLevel != DXGKMDT_OPM_HDCP_ON) {
+    return STATUS_INVALID_PARAMETER;
+  }
+
+  return GDIFUNC(ConfigureOPMProtectedOutput)(protected_output, &config, 0,
+                                              nullptr);
+}
+
+NTSTATUS ProcessMitigationsWin32KLockdownPolicy::GetOPMInformationAction(
+    const ClientInfo& client_info,
+    HANDLE protected_output,
+    void* parameters,
+    void* requested_information) {
+  DXGKMDT_OPM_GET_INFO_PARAMETERS params;
+  memcpy(&params, parameters, sizeof(DXGKMDT_OPM_GET_INFO_PARAMETERS));
+
+  bool valid_parameters = false;
+  // Validate sizes based on the type being requested.
+  if ((params.guidInformation == DXGKMDT_OPM_GET_CONNECTOR_TYPE ||
+       params.guidInformation == DXGKMDT_OPM_GET_SUPPORTED_PROTECTION_TYPES) &&
+      params.cbParametersSize == 0) {
+    valid_parameters = true;
+  } else if ((params.guidInformation ==
+                  DXGKMDT_OPM_GET_VIRTUAL_PROTECTION_LEVEL ||
+              params.guidInformation ==
+                  DXGKMDT_OPM_GET_ACTUAL_PROTECTION_LEVEL) &&
+             params.cbParametersSize == sizeof(uint32_t)) {
+    uint32_t param_value;
+    memcpy(&param_value, params.abParameters, sizeof(uint32_t));
+    if (param_value == DXGKMDT_OPM_PROTECTION_TYPE_HDCP ||
+        param_value == DXGKMDT_OPM_PROTECTION_TYPE_DPCP) {
+      valid_parameters = true;
+    }
+  }
+  if (!valid_parameters)
+    return STATUS_INVALID_PARAMETER;
+
+  return GDIFUNC(GetOPMInformation)(
+      protected_output, &params,
+      static_cast<DXGKMDT_OPM_REQUESTED_INFORMATION*>(requested_information));
+}
+
+NTSTATUS
+ProcessMitigationsWin32KLockdownPolicy::DestroyOPMProtectedOutputAction(
+    HANDLE protected_output) {
+  return GDIFUNC(DestroyOPMProtectedOutput)(protected_output);
+}
+
 }  // namespace sandbox