src/sandbox/win/src/interception_unittest.cc

   1 // Copyright (c) 2011 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 // This file contains unit tests for InterceptionManager.
   6 // The tests require private information so the whole interception.cc file is
   7 // included from this file.
   8
   9 #include <windows.h>
  10
  11 #include "base/memory/scoped_ptr.h"
  12 #include "sandbox/win/src/interception.h"
  13 #include "sandbox/win/src/interceptors.h"
  14 #include "sandbox/win/src/interception_internal.h"
  15 #include "sandbox/win/src/target_process.h"
  16 #include "testing/gtest/include/gtest/gtest.h"
  17
  18 namespace sandbox {
  19
  20 // Walks the settings buffer, verifying that the values make sense and counting
  21 // objects.
  22 // Arguments:
  23 // buffer (in): the buffer to walk.
  24 // size (in): buffer size
  25 // num_dlls (out): count of the dlls on the buffer.
  26 // num_function (out): count of intercepted functions.
  27 // num_names (out): count of named interceptor functions.
  28 void WalkBuffer(void* buffer, size_t size, int* num_dlls, int* num_functions,
  29                 int* num_names) {
  30   ASSERT_TRUE(NULL != buffer);
  31   ASSERT_TRUE(NULL != num_functions);
  32   ASSERT_TRUE(NULL != num_names);
  33   *num_dlls = *num_functions = *num_names = 0;
  34   SharedMemory *memory = reinterpret_cast<SharedMemory*>(buffer);
  35
  36   ASSERT_GT(size, sizeof(SharedMemory));
  37   DllPatchInfo *dll = &memory->dll_list[0];
  38
  39   for (int i = 0; i < memory->num_intercepted_dlls; i++) {
  40     ASSERT_NE(0u, wcslen(dll->dll_name));
  41     ASSERT_EQ(0u, dll->record_bytes % sizeof(size_t));
  42     ASSERT_EQ(0u, dll->offset_to_functions % sizeof(size_t));
  43     ASSERT_NE(0, dll->num_functions);
  44
  45     FunctionInfo *function = reinterpret_cast<FunctionInfo*>(
  46       reinterpret_cast<char*>(dll) + dll->offset_to_functions);
  47
  48     for (int j = 0; j < dll->num_functions; j++) {
  49       ASSERT_EQ(0u, function->record_bytes % sizeof(size_t));
  50
  51       char* name = function->function;
  52       size_t length = strlen(name);
  53       ASSERT_NE(0u, length);
  54       name += length + 1;
  55
  56       // look for overflows
  57       ASSERT_GT(reinterpret_cast<char*>(buffer) + size, name + strlen(name));
  58
  59       // look for a named interceptor
  60       if (strlen(name)) {
  61         (*num_names)++;
  62         EXPECT_TRUE(NULL == function->interceptor_address);
  63       } else {
  64         EXPECT_TRUE(NULL != function->interceptor_address);
  65       }
  66
  67       (*num_functions)++;
  68       function = reinterpret_cast<FunctionInfo*>(
  69         reinterpret_cast<char*>(function) + function->record_bytes);
  70     }
  71
  72     (*num_dlls)++;
  73     dll = reinterpret_cast<DllPatchInfo*>(reinterpret_cast<char*>(dll) +
  74                                           dll->record_bytes);
  75   }
  76 }
  77
  78 TEST(InterceptionManagerTest, BufferLayout1) {
  79   wchar_t exe_name[MAX_PATH];
  80   ASSERT_NE(0u, GetModuleFileName(NULL, exe_name, MAX_PATH - 1));
  81
  82   TargetProcess *target = MakeTestTargetProcess(::GetCurrentProcess(),
  83                                                 ::GetModuleHandle(exe_name));
  84
  85   InterceptionManager interceptions(target, true);
  86
  87   // Any pointer will do for a function pointer.
  88   void* function = &interceptions;
  89
  90   // We don't care about the interceptor id.
  91   interceptions.AddToPatchedFunctions(L"ntdll.dll", "NtCreateFile",
  92                                       INTERCEPTION_SERVICE_CALL, function,
  93                                       OPEN_KEY_ID);
  94   interceptions.AddToPatchedFunctions(L"kernel32.dll", "CreateFileEx",
  95                                       INTERCEPTION_EAT, function, OPEN_KEY_ID);
  96   interceptions.AddToPatchedFunctions(L"kernel32.dll", "SomeFileEx",
  97                                       INTERCEPTION_SMART_SIDESTEP, function,
  98                                       OPEN_KEY_ID);
  99   interceptions.AddToPatchedFunctions(L"user32.dll", "FindWindow",
 100                                       INTERCEPTION_EAT, function, OPEN_KEY_ID);
 101   interceptions.AddToPatchedFunctions(L"kernel32.dll", "CreateMutex",
 102                                       INTERCEPTION_EAT, function, OPEN_KEY_ID);
 103   interceptions.AddToPatchedFunctions(L"user32.dll", "PostMsg",
 104                                       INTERCEPTION_EAT, function, OPEN_KEY_ID);
 105   interceptions.AddToPatchedFunctions(L"user32.dll", "PostMsg",
 106                                       INTERCEPTION_EAT, "replacement",
 107                                       OPEN_KEY_ID);
 108   interceptions.AddToPatchedFunctions(L"comctl.dll", "SaveAsDlg",
 109                                       INTERCEPTION_EAT, function, OPEN_KEY_ID);
 110   interceptions.AddToPatchedFunctions(L"ntdll.dll", "NtClose",
 111                                       INTERCEPTION_SERVICE_CALL, function,
 112                                       OPEN_KEY_ID);
 113   interceptions.AddToPatchedFunctions(L"ntdll.dll", "NtOpenFile",
 114                                       INTERCEPTION_SIDESTEP, function,
 115                                       OPEN_KEY_ID);
 116   interceptions.AddToPatchedFunctions(L"some.dll", "Superfn",
 117                                       INTERCEPTION_EAT, function, OPEN_KEY_ID);
 118   interceptions.AddToPatchedFunctions(L"comctl.dll", "SaveAsDlg",
 119                                       INTERCEPTION_EAT, "a", OPEN_KEY_ID);
 120   interceptions.AddToPatchedFunctions(L"comctl.dll", "SaveAsDlg",
 121                                       INTERCEPTION_SIDESTEP, "ab", OPEN_KEY_ID);
 122   interceptions.AddToPatchedFunctions(L"comctl.dll", "SaveAsDlg",
 123                                       INTERCEPTION_EAT, "abc", OPEN_KEY_ID);
 124   interceptions.AddToPatchedFunctions(L"a.dll", "p",
 125                                       INTERCEPTION_EAT, function, OPEN_KEY_ID);
 126   interceptions.AddToPatchedFunctions(L"b.dll",
 127                                       "TheIncredibleCallToSaveTheWorld",
 128                                       INTERCEPTION_EAT, function, OPEN_KEY_ID);
 129   interceptions.AddToPatchedFunctions(L"a.dll", "BIsLame",
 130                                       INTERCEPTION_EAT, function, OPEN_KEY_ID);
 131   interceptions.AddToPatchedFunctions(L"a.dll", "ARules",
 132                                       INTERCEPTION_EAT, function, OPEN_KEY_ID);
 133
 134   // Verify that all interceptions were added
 135   ASSERT_EQ(18, interceptions.interceptions_.size());
 136
 137   size_t buffer_size = interceptions.GetBufferSize();
 138   scoped_ptr<BYTE[]> local_buffer(new BYTE[buffer_size]);
 139
 140   ASSERT_TRUE(interceptions.SetupConfigBuffer(local_buffer.get(),
 141                                               buffer_size));
 142
 143   // At this point, the interceptions should have been separated into two
 144   // groups: one group with the local ("cold") interceptions, consisting of
 145   // everything from ntdll and stuff set as INTRECEPTION_SERVICE_CALL, and
 146   // another group with the interceptions belonging to dlls that will be "hot"
 147   // patched on the client. The second group lives on local_buffer, and the
 148   // first group remains on the list of interceptions (inside the object
 149   // "interceptions"). There are 3 local interceptions (of ntdll); the
 150   // other 15 have to be sent to the child to be performed "hot".
 151   EXPECT_EQ(3, interceptions.interceptions_.size());
 152
 153   int num_dlls, num_functions, num_names;
 154   WalkBuffer(local_buffer.get(), buffer_size, &num_dlls, &num_functions,
 155              &num_names);
 156
 157   // The 15 interceptions on the buffer (to the child) should be grouped on 6
 158   // dlls. Only four interceptions are using an explicit name for the
 159   // interceptor function.
 160   EXPECT_EQ(6, num_dlls);
 161   EXPECT_EQ(15, num_functions);
 162   EXPECT_EQ(4, num_names);
 163 }
 164
 165 TEST(InterceptionManagerTest, BufferLayout2) {
 166   wchar_t exe_name[MAX_PATH];
 167   ASSERT_NE(0u, GetModuleFileName(NULL, exe_name, MAX_PATH - 1));
 168
 169   TargetProcess *target = MakeTestTargetProcess(::GetCurrentProcess(),
 170                                                 ::GetModuleHandle(exe_name));
 171
 172   InterceptionManager interceptions(target, true);
 173
 174   // Any pointer will do for a function pointer.
 175   void* function = &interceptions;
 176   interceptions.AddToUnloadModules(L"some01.dll");
 177   // We don't care about the interceptor id.
 178   interceptions.AddToPatchedFunctions(L"ntdll.dll", "NtCreateFile",
 179                                       INTERCEPTION_SERVICE_CALL, function,
 180                                       OPEN_FILE_ID);
 181   interceptions.AddToPatchedFunctions(L"kernel32.dll", "CreateFileEx",
 182                                       INTERCEPTION_EAT, function, OPEN_FILE_ID);
 183   interceptions.AddToUnloadModules(L"some02.dll");
 184   interceptions.AddToPatchedFunctions(L"kernel32.dll", "SomeFileEx",
 185                                       INTERCEPTION_SMART_SIDESTEP, function,
 186                                       OPEN_FILE_ID);
 187   // Verify that all interceptions were added
 188   ASSERT_EQ(5, interceptions.interceptions_.size());
 189
 190   size_t buffer_size = interceptions.GetBufferSize();
 191   scoped_ptr<BYTE[]> local_buffer(new BYTE[buffer_size]);
 192
 193   ASSERT_TRUE(interceptions.SetupConfigBuffer(local_buffer.get(),
 194                                               buffer_size));
 195
 196   // At this point, the interceptions should have been separated into two
 197   // groups: one group with the local ("cold") interceptions, and another
 198   // group with the interceptions belonging to dlls that will be "hot"
 199   // patched on the client. The second group lives on local_buffer, and the
 200   // first group remains on the list of interceptions, in this case just one.
 201   EXPECT_EQ(1, interceptions.interceptions_.size());
 202
 203   int num_dlls, num_functions, num_names;
 204   WalkBuffer(local_buffer.get(), buffer_size, &num_dlls, &num_functions,
 205              &num_names);
 206
 207   EXPECT_EQ(3, num_dlls);
 208   EXPECT_EQ(4, num_functions);
 209   EXPECT_EQ(0, num_names);
 210 }
 211
 212 }  // namespace sandbox