1 files changed, 118 insertions, 0 deletions
diff --git a/sandbox/src/policy_broker.cc b/sandbox/src/policy_broker.cc
new file mode 100644
index 0000000..61c64c6
--- /dev/null
+++ b/sandbox/src/policy_broker.cc
@@ -0,0 +1,118 @@
+// 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 <map>
+
+#include "sandbox/src/policy_broker.h"
+
+#include "base/logging.h"
+#include "base/win/pe_image.h"
+#include "base/win/windows_version.h"
+#include "sandbox/src/interception.h"
+#include "sandbox/src/interceptors.h"
+#include "sandbox/src/policy_target.h"
+#include "sandbox/src/process_thread_interception.h"
+#include "sandbox/src/sandbox.h"
+#include "sandbox/src/sandbox_nt_types.h"
+#include "sandbox/src/sandbox_types.h"
+#include "sandbox/src/sandbox_utils.h"
+#include "sandbox/src/target_process.h"
+
+// This code executes on the broker side, as a callback from the policy on the
+// target side (the child).
+
+namespace sandbox {
+
+// This is the list of all imported symbols from ntdll.dll.
+SANDBOX_INTERCEPT NtExports g_nt;
+
+#define INIT_GLOBAL_NT(member) \
+  g_nt.member = reinterpret_cast<Nt##member##Function>( \
+                      ntdll_image.GetProcAddress("Nt" #member)); \
+  if (NULL == g_nt.member) \
+    return false
+
+#define INIT_GLOBAL_RTL(member) \
+  g_nt.member = reinterpret_cast<member##Function>( \
+                      ntdll_image.GetProcAddress(#member)); \
+  if (NULL == g_nt.member) \
+    return false
+
+bool SetupNtdllImports(TargetProcess *child) {
+  HMODULE ntdll = ::GetModuleHandle(kNtdllName);
+  base::win::PEImage ntdll_image(ntdll);
+
+  // Bypass purify's interception.
+  wchar_t* loader_get = reinterpret_cast<wchar_t*>(
+                            ntdll_image.GetProcAddress("LdrGetDllHandle"));
+  if (loader_get) {
+    GetModuleHandleHelper(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |
+                              GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
+                          loader_get, &ntdll);
+  }
+
+  INIT_GLOBAL_NT(AllocateVirtualMemory);
+  INIT_GLOBAL_NT(Close);
+  INIT_GLOBAL_NT(DuplicateObject);
+  INIT_GLOBAL_NT(FreeVirtualMemory);
+  INIT_GLOBAL_NT(MapViewOfSection);
+  INIT_GLOBAL_NT(ProtectVirtualMemory);
+  INIT_GLOBAL_NT(QueryInformationProcess);
+  INIT_GLOBAL_NT(QueryObject);
+  INIT_GLOBAL_NT(QuerySection);
+  INIT_GLOBAL_NT(QueryVirtualMemory);
+  INIT_GLOBAL_NT(UnmapViewOfSection);
+
+  INIT_GLOBAL_RTL(RtlAllocateHeap);
+  INIT_GLOBAL_RTL(RtlAnsiStringToUnicodeString);
+  INIT_GLOBAL_RTL(RtlCompareUnicodeString);
+  INIT_GLOBAL_RTL(RtlCreateHeap);
+  INIT_GLOBAL_RTL(RtlCreateUserThread);
+  INIT_GLOBAL_RTL(RtlDestroyHeap);
+  INIT_GLOBAL_RTL(RtlFreeHeap);
+  INIT_GLOBAL_RTL(_strnicmp);
+  INIT_GLOBAL_RTL(strlen);
+  INIT_GLOBAL_RTL(wcslen);
+
+#ifndef NDEBUG
+  // Verify that the structure is fully initialized.
+  for (size_t i = 0; i < sizeof(g_nt)/sizeof(void*); i++)
+    DCHECK(reinterpret_cast<char**>(&g_nt)[i]);
+#endif
+  ResultCode ret = child->TransferVariable("g_nt", &g_nt, sizeof(g_nt));
+
+  return SBOX_ALL_OK == ret ? true : false;
+}
+
+#undef INIT_GLOBAL_NT
+#undef INIT_GLOBAL_RTL
+
+bool SetupBasicInterceptions(InterceptionManager* manager) {
+  // Interceptions provided by process_thread_policy, without actual policy.
+  if (!INTERCEPT_NT(manager, NtOpenThread, OPEN_TREAD_ID, 20) ||
+      !INTERCEPT_NT(manager, NtOpenProcess, OPEN_PROCESS_ID, 20) ||
+      !INTERCEPT_NT(manager, NtOpenProcessToken, OPEN_PROCESS_TOKEN_ID, 16))
+    return false;
+
+  // Interceptions with neither policy nor IPC.
+  if (!INTERCEPT_NT(manager, NtSetInformationThread, SET_INFORMATION_THREAD_ID,
+                    20) ||
+      !INTERCEPT_NT(manager, NtOpenThreadToken, OPEN_THREAD_TOKEN_ID, 20))
+    return false;
+
+  if (base::win::GetVersion() >= base::win::VERSION_XP) {
+    // Bug 27218: We don't have dispatch for some x64 syscalls.
+    // This one is also provided by process_thread_policy.
+    if (!INTERCEPT_NT(manager, NtOpenProcessTokenEx, OPEN_PROCESS_TOKEN_EX_ID,
+                      20))
+      return false;
+
+    return INTERCEPT_NT(manager, NtOpenThreadTokenEx, OPEN_THREAD_TOKEN_EX_ID,
+                        24);
+  }
+
+  return true;
+}
+
+}  // namespace sandbox