Remove sandbox on Windows.

sandbox/win/src/process_mitigations.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 "sandbox/win/src/process_mitigations.h"
-
-#include <stddef.h>
-
-#include <algorithm>
-
-#include "base/win/windows_version.h"
-#include "sandbox/win/src/nt_internals.h"
-#include "sandbox/win/src/restricted_token_utils.h"
-#include "sandbox/win/src/sandbox_rand.h"
-#include "sandbox/win/src/win_utils.h"
-
-namespace {
-
-// Functions for enabling policies.
-typedef BOOL (WINAPI *SetProcessDEPPolicyFunction)(DWORD dwFlags);
-
-typedef BOOL (WINAPI *SetProcessMitigationPolicyFunction)(
-    PROCESS_MITIGATION_POLICY mitigation_policy,
-    PVOID buffer,
-    SIZE_T length);
-
-typedef BOOL (WINAPI *SetDefaultDllDirectoriesFunction)(
-    DWORD DirectoryFlags);
-
-}  // namespace
-
-namespace sandbox {
-
-bool ApplyProcessMitigationsToCurrentProcess(MitigationFlags flags) {
-  if (!CanSetProcessMitigationsPostStartup(flags))
-    return false;
-
-  base::win::Version version = base::win::GetVersion();
-  HMODULE module = ::GetModuleHandleA("kernel32.dll");
-
-  if (flags & MITIGATION_DLL_SEARCH_ORDER) {
-    SetDefaultDllDirectoriesFunction set_default_dll_directories =
-        reinterpret_cast<SetDefaultDllDirectoriesFunction>(
-            ::GetProcAddress(module, "SetDefaultDllDirectories"));
-
-    // Check for SetDefaultDllDirectories since it requires KB2533623.
-    if (set_default_dll_directories) {
-      if (!set_default_dll_directories(LOAD_LIBRARY_SEARCH_DEFAULT_DIRS) &&
-          ERROR_ACCESS_DENIED != ::GetLastError()) {
-        return false;
-      }
-    }
-  }
-
-  // Set the heap to terminate on corruption
-  if (flags & MITIGATION_HEAP_TERMINATE) {
-    if (!::HeapSetInformation(NULL, HeapEnableTerminationOnCorruption,
-                              NULL, 0) &&
-        ERROR_ACCESS_DENIED != ::GetLastError()) {
-      return false;
-    }
-  }
-
-  if (flags & MITIGATION_HARDEN_TOKEN_IL_POLICY) {
-      DWORD error = HardenProcessIntegrityLevelPolicy();
-      if ((error != ERROR_SUCCESS) && (error != ERROR_ACCESS_DENIED))
-        return false;
-  }
-
-#if !defined(_WIN64)  // DEP is always enabled on 64-bit.
-  if (flags & MITIGATION_DEP) {
-    DWORD dep_flags = PROCESS_DEP_ENABLE;
-
-    if (flags & MITIGATION_DEP_NO_ATL_THUNK)
-      dep_flags |= PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION;
-
-    SetProcessDEPPolicyFunction set_process_dep_policy =
-        reinterpret_cast<SetProcessDEPPolicyFunction>(
-            ::GetProcAddress(module, "SetProcessDEPPolicy"));
-    if (set_process_dep_policy) {
-      if (!set_process_dep_policy(dep_flags) &&
-        ERROR_ACCESS_DENIED != ::GetLastError()) {
-        return false;
-      }
-    } else
-      return false;
-  }
-#endif
-
-  // This is all we can do in Win7 and below.
-  if (version < base::win::VERSION_WIN8)
-    return true;
-
-  SetProcessMitigationPolicyFunction set_process_mitigation_policy =
-      reinterpret_cast<SetProcessMitigationPolicyFunction>(
-          ::GetProcAddress(module, "SetProcessMitigationPolicy"));
-  if (!set_process_mitigation_policy)
-    return false;
-
-  // Enable ASLR policies.
-  if (flags & MITIGATION_RELOCATE_IMAGE) {
-    PROCESS_MITIGATION_ASLR_POLICY policy = {};
-    policy.EnableForceRelocateImages = true;
-    policy.DisallowStrippedImages = (flags &
-        MITIGATION_RELOCATE_IMAGE_REQUIRED) ==
-        MITIGATION_RELOCATE_IMAGE_REQUIRED;
-
-    if (!set_process_mitigation_policy(ProcessASLRPolicy, &policy,
-                                       sizeof(policy)) &&
-        ERROR_ACCESS_DENIED != ::GetLastError()) {
-      return false;
-    }
-  }
-
-  // Enable strict handle policies.
-  if (flags & MITIGATION_STRICT_HANDLE_CHECKS) {
-    PROCESS_MITIGATION_STRICT_HANDLE_CHECK_POLICY policy = {};
-    policy.HandleExceptionsPermanentlyEnabled =
-        policy.RaiseExceptionOnInvalidHandleReference = true;
-
-    if (!set_process_mitigation_policy(ProcessStrictHandleCheckPolicy, &policy,
-                                       sizeof(policy)) &&
-        ERROR_ACCESS_DENIED != ::GetLastError()) {
-      return false;
-    }
-  }
-
-  // Enable system call policies.
-  if (flags & MITIGATION_WIN32K_DISABLE) {
-    PROCESS_MITIGATION_SYSTEM_CALL_DISABLE_POLICY policy = {};
-    policy.DisallowWin32kSystemCalls = true;
-
-    if (!set_process_mitigation_policy(ProcessSystemCallDisablePolicy, &policy,
-                                       sizeof(policy)) &&
-        ERROR_ACCESS_DENIED != ::GetLastError()) {
-      return false;
-    }
-  }
-
-  // Enable dll extension policies.
-  if (flags & MITIGATION_EXTENSION_DLL_DISABLE) {
-    PROCESS_MITIGATION_EXTENSION_POINT_DISABLE_POLICY policy = {};
-    policy.DisableExtensionPoints = true;
-
-    if (!set_process_mitigation_policy(ProcessExtensionPointDisablePolicy,
-                                       &policy, sizeof(policy)) &&
-        ERROR_ACCESS_DENIED != ::GetLastError()) {
-      return false;
-    }
-  }
-
-  if (version < base::win::VERSION_WIN10)
-    return true;
-
-  // Enable font policies.
-  if (flags & MITIGATION_NONSYSTEM_FONT_DISABLE) {
-    PROCESS_MITIGATION_FONT_DISABLE_POLICY policy = {};
-    policy.DisableNonSystemFonts = true;
-
-    if (!set_process_mitigation_policy(ProcessFontDisablePolicy, &policy,
-                                       sizeof(policy)) &&
-        ERROR_ACCESS_DENIED != ::GetLastError()) {
-      return false;
-    }
-  }
-
-  if (version < base::win::VERSION_WIN10_TH2)
-    return true;
-
-  // Enable image load policies.
-  if (flags & MITIGATION_IMAGE_LOAD_NO_REMOTE ||
-      flags & MITIGATION_IMAGE_LOAD_NO_LOW_LABEL) {
-    PROCESS_MITIGATION_IMAGE_LOAD_POLICY policy = {};
-    if (flags & MITIGATION_IMAGE_LOAD_NO_REMOTE)
-      policy.NoRemoteImages = true;
-    if (flags & MITIGATION_IMAGE_LOAD_NO_LOW_LABEL)
-      policy.NoLowMandatoryLabelImages = true;
-
-    if (!set_process_mitigation_policy(ProcessImageLoadPolicy, &policy,
-                                       sizeof(policy)) &&
-        ERROR_ACCESS_DENIED != ::GetLastError()) {
-      return false;
-    }
-  }
-
-  return true;
-}
-
-void ConvertProcessMitigationsToPolicy(MitigationFlags flags,
-                                       DWORD64* policy_flags,
-                                       size_t* size) {
-  base::win::Version version = base::win::GetVersion();
-
-  *policy_flags = 0;
-#if defined(_WIN64)
-  *size = sizeof(*policy_flags);
-#elif defined(_M_IX86)
-  // A 64-bit flags attribute is illegal on 32-bit Win 7 and below.
-  if (version < base::win::VERSION_WIN8)
-    *size = sizeof(DWORD);
-  else
-    *size = sizeof(*policy_flags);
-#else
-#error This platform is not supported.
-#endif
-
-  // DEP and SEHOP are not valid for 64-bit Windows
-#if !defined(_WIN64)
-  if (flags & MITIGATION_DEP) {
-    *policy_flags |= PROCESS_CREATION_MITIGATION_POLICY_DEP_ENABLE;
-    if (!(flags & MITIGATION_DEP_NO_ATL_THUNK))
-      *policy_flags |= PROCESS_CREATION_MITIGATION_POLICY_DEP_ATL_THUNK_ENABLE;
-  }
-
-  if (flags & MITIGATION_SEHOP)
-    *policy_flags |= PROCESS_CREATION_MITIGATION_POLICY_SEHOP_ENABLE;
-#endif
-
-  // Win 7
-  if (version < base::win::VERSION_WIN8)
-    return;
-
-  if (flags & MITIGATION_RELOCATE_IMAGE) {
-    *policy_flags |=
-        PROCESS_CREATION_MITIGATION_POLICY_FORCE_RELOCATE_IMAGES_ALWAYS_ON;
-    if (flags & MITIGATION_RELOCATE_IMAGE_REQUIRED) {
-      *policy_flags |=
-          PROCESS_CREATION_MITIGATION_POLICY_FORCE_RELOCATE_IMAGES_ALWAYS_ON_REQ_RELOCS;
-    }
-  }
-
-  if (flags & MITIGATION_HEAP_TERMINATE) {
-    *policy_flags |=
-        PROCESS_CREATION_MITIGATION_POLICY_HEAP_TERMINATE_ALWAYS_ON;
-  }
-
-  if (flags & MITIGATION_BOTTOM_UP_ASLR) {
-    *policy_flags |=
-        PROCESS_CREATION_MITIGATION_POLICY_BOTTOM_UP_ASLR_ALWAYS_ON;
-  }
-
-  if (flags & MITIGATION_HIGH_ENTROPY_ASLR) {
-    *policy_flags |=
-        PROCESS_CREATION_MITIGATION_POLICY_HIGH_ENTROPY_ASLR_ALWAYS_ON;
-  }
-
-  if (flags & MITIGATION_STRICT_HANDLE_CHECKS) {
-    *policy_flags |=
-        PROCESS_CREATION_MITIGATION_POLICY_STRICT_HANDLE_CHECKS_ALWAYS_ON;
-  }
-
-  if (flags & MITIGATION_WIN32K_DISABLE) {
-    *policy_flags |=
-        PROCESS_CREATION_MITIGATION_POLICY_WIN32K_SYSTEM_CALL_DISABLE_ALWAYS_ON;
-  }
-
-  if (flags & MITIGATION_EXTENSION_DLL_DISABLE) {
-    *policy_flags |=
-        PROCESS_CREATION_MITIGATION_POLICY_EXTENSION_POINT_DISABLE_ALWAYS_ON;
-  }
-
-  if (version < base::win::VERSION_WIN10)
-    return;
-
-  if (flags & MITIGATION_NONSYSTEM_FONT_DISABLE) {
-    *policy_flags |= PROCESS_CREATION_MITIGATION_POLICY_FONT_DISABLE_ALWAYS_ON;
-  }
-
-  if (version < base::win::VERSION_WIN10_TH2)
-    return;
-
-  if (flags & MITIGATION_IMAGE_LOAD_NO_REMOTE) {
-    *policy_flags |=
-        PROCESS_CREATION_MITIGATION_POLICY_IMAGE_LOAD_NO_REMOTE_ALWAYS_ON;
-  }
-
-  if (flags & MITIGATION_IMAGE_LOAD_NO_LOW_LABEL) {
-    *policy_flags |=
-        PROCESS_CREATION_MITIGATION_POLICY_IMAGE_LOAD_NO_LOW_LABEL_ALWAYS_ON;
-  }
-}
-
-MitigationFlags FilterPostStartupProcessMitigations(MitigationFlags flags) {
-  base::win::Version version = base::win::GetVersion();
-
-  // Windows 7.
-  if (version < base::win::VERSION_WIN8) {
-    return flags & (MITIGATION_BOTTOM_UP_ASLR |
-                    MITIGATION_DLL_SEARCH_ORDER |
-                    MITIGATION_HEAP_TERMINATE);
-  }
-
-  // Windows 8 and above.
-  return flags & (MITIGATION_BOTTOM_UP_ASLR |
-                  MITIGATION_DLL_SEARCH_ORDER);
-}
-
-bool ApplyProcessMitigationsToSuspendedProcess(HANDLE process,
-                                               MitigationFlags flags) {
-// This is a hack to fake a weak bottom-up ASLR on 32-bit Windows.
-#if !defined(_WIN64)
-  if (flags & MITIGATION_BOTTOM_UP_ASLR) {
-    unsigned int limit;
-    GetRandom(&limit);
-    char* ptr = 0;
-    const size_t kMask64k = 0xFFFF;
-    // Random range (512k-16.5mb) in 64k steps.
-    const char* end = ptr + ((((limit % 16384) + 512) * 1024) & ~kMask64k);
-    while (ptr < end) {
-      MEMORY_BASIC_INFORMATION memory_info;
-      if (!::VirtualQueryEx(process, ptr, &memory_info, sizeof(memory_info)))
-        break;
-      size_t size = std::min((memory_info.RegionSize + kMask64k) & ~kMask64k,
-                             static_cast<SIZE_T>(end - ptr));
-      if (ptr && memory_info.State == MEM_FREE)
-        ::VirtualAllocEx(process, ptr, size, MEM_RESERVE, PAGE_NOACCESS);
-      ptr += size;
-    }
-  }
-#endif
-
-  return true;
-}
-
-bool CanSetProcessMitigationsPostStartup(MitigationFlags flags) {
-  // All of these mitigations can be enabled after startup.
-  return !(
-      flags &
-      ~(MITIGATION_HEAP_TERMINATE |
-        MITIGATION_DEP |
-        MITIGATION_DEP_NO_ATL_THUNK |
-        MITIGATION_RELOCATE_IMAGE |
-        MITIGATION_RELOCATE_IMAGE_REQUIRED |
-        MITIGATION_BOTTOM_UP_ASLR |
-        MITIGATION_STRICT_HANDLE_CHECKS |
-        MITIGATION_EXTENSION_DLL_DISABLE |
-        MITIGATION_DLL_SEARCH_ORDER |
-        MITIGATION_HARDEN_TOKEN_IL_POLICY |
-        MITIGATION_WIN32K_DISABLE |
-        MITIGATION_NONSYSTEM_FONT_DISABLE |
-        MITIGATION_IMAGE_LOAD_NO_REMOTE |
-        MITIGATION_IMAGE_LOAD_NO_LOW_LABEL));
-}
-
-bool CanSetProcessMitigationsPreStartup(MitigationFlags flags) {
-  // These mitigations cannot be enabled prior to startup.
-  return !(flags & (MITIGATION_STRICT_HANDLE_CHECKS |
-                    MITIGATION_DLL_SEARCH_ORDER));
-}
-
-}  // namespace sandbox
-