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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// This file contains unit tests for InterceptionManager.
// The tests require private information so the whole interception.cc file is
// included from this file.
#include "base/scoped_ptr.h"
#include "sandbox/src/interception.cc"
#include "testing/gtest/include/gtest/gtest.h"
namespace sandbox {
// Walks the settings buffer, verifying that the values make sense and counting
// objects.
// Arguments:
// buffer (in): the buffer to walk.
// size (in): buffer size
// num_dlls (out): count of the dlls on the buffer.
// num_function (out): count of intercepted functions.
// num_names (out): count of named interceptor functions.
void WalkBuffer(void* buffer, size_t size, int* num_dlls, int* num_functions,
int* num_names) {
ASSERT_TRUE(NULL != buffer);
ASSERT_TRUE(NULL != num_functions);
ASSERT_TRUE(NULL != num_names);
*num_dlls = *num_functions = *num_names = 0;
SharedMemory *memory = reinterpret_cast<SharedMemory*>(buffer);
ASSERT_GT(size, sizeof(SharedMemory));
DllPatchInfo *dll = &memory->dll_list[0];
for (int i = 0; i < memory->num_intercepted_dlls; i++) {
ASSERT_NE(0, wcslen(dll->dll_name));
ASSERT_EQ(0, dll->record_bytes % sizeof(size_t));
ASSERT_EQ(0, dll->offset_to_functions % sizeof(size_t));
ASSERT_NE(0, dll->num_functions);
FunctionInfo *function = reinterpret_cast<FunctionInfo*>(
reinterpret_cast<char*>(dll) + dll->offset_to_functions);
for (int j = 0; j < dll->num_functions; j++) {
ASSERT_EQ(0, function->record_bytes % sizeof(size_t));
char* name = function->function;
size_t length = strlen(name);
ASSERT_NE(0, length);
name += length + 1;
// look for overflows
ASSERT_GT(reinterpret_cast<char*>(buffer) + size, name + strlen(name));
// look for a named interceptor
if (strlen(name)) {
(*num_names)++;
EXPECT_TRUE(NULL == function->interceptor_address);
} else {
EXPECT_TRUE(NULL != function->interceptor_address);
}
(*num_functions)++;
function = reinterpret_cast<FunctionInfo*>(
reinterpret_cast<char*>(function) + function->record_bytes);
}
(*num_dlls)++;
dll = reinterpret_cast<DllPatchInfo*>(reinterpret_cast<char*>(dll) +
dll->record_bytes);
}
}
TEST(InterceptionManagerTest, BufferLayout) {
wchar_t exe_name[MAX_PATH];
ASSERT_NE(0, GetModuleFileName(NULL, exe_name, MAX_PATH - 1));
TargetProcess *target = MakeTestTargetProcess(::GetCurrentProcess(),
::GetModuleHandle(exe_name));
InterceptionManager interceptions(target, true);
// Any pointer will do for a function pointer.
void* function = &interceptions;
interceptions.AddToPatchedFunctions(L"ntdll.dll", "NtCreateFile",
INTERCEPTION_SERVICE_CALL, function);
interceptions.AddToPatchedFunctions(L"kernel32.dll", "CreateFileEx",
INTERCEPTION_EAT, function);
interceptions.AddToPatchedFunctions(L"kernel32.dll", "SomeFileEx",
INTERCEPTION_SMART_SIDESTEP, function);
interceptions.AddToPatchedFunctions(L"user32.dll", "FindWindow",
INTERCEPTION_EAT, function);
interceptions.AddToPatchedFunctions(L"kernel32.dll", "CreateMutex",
INTERCEPTION_EAT, function);
interceptions.AddToPatchedFunctions(L"user32.dll", "PostMsg",
INTERCEPTION_EAT, function);
interceptions.AddToPatchedFunctions(L"user32.dll", "PostMsg",
INTERCEPTION_EAT, "replacement");
interceptions.AddToPatchedFunctions(L"comctl.dll", "SaveAsDlg",
INTERCEPTION_EAT, function);
interceptions.AddToPatchedFunctions(L"ntdll.dll", "NtClose",
INTERCEPTION_SERVICE_CALL, function);
interceptions.AddToPatchedFunctions(L"ntdll.dll", "NtOpenFile",
INTERCEPTION_SIDESTEP, function);
interceptions.AddToPatchedFunctions(L"some.dll", "Superfn",
INTERCEPTION_EAT, function);
interceptions.AddToPatchedFunctions(L"comctl.dll", "SaveAsDlg",
INTERCEPTION_EAT, "a");
interceptions.AddToPatchedFunctions(L"comctl.dll", "SaveAsDlg",
INTERCEPTION_SIDESTEP, "ab");
interceptions.AddToPatchedFunctions(L"comctl.dll", "SaveAsDlg",
INTERCEPTION_EAT, "abc");
interceptions.AddToPatchedFunctions(L"a.dll", "p",
INTERCEPTION_EAT, function);
interceptions.AddToPatchedFunctions(L"b.dll",
"TheIncredibleCallToSaveTheWorld", INTERCEPTION_EAT, function);
interceptions.AddToPatchedFunctions(L"a.dll", "BIsLame",
INTERCEPTION_EAT, function);
interceptions.AddToPatchedFunctions(L"a.dll", "ARules",
INTERCEPTION_EAT, function);
// Verify that all interceptions were added
ASSERT_EQ(18, interceptions.interceptions_.size());
size_t buffer_size = interceptions.GetBufferSize();
scoped_ptr<BYTE> local_buffer(new BYTE[buffer_size]);
ASSERT_TRUE(interceptions.SetupConfigBuffer(local_buffer.get(),
buffer_size));
// At this point, the interceptions should have been separated into two
// groups: one group with the local ("cold") interceptions, consisting of
// everything from ntdll and stuff set as INTRECEPTION_SERVICE_CALL, and
// another group with the interceptions belonging to dlls that will be "hot"
// patched on the client. The second group lives on local_buffer, and the
// first group remains on the list of interceptions (inside the object
// "interceptions"). There are 3 local interceptions (of ntdll); the
// other 15 have to be sent to the child to be performed "hot".
EXPECT_EQ(3, interceptions.interceptions_.size());
int num_dlls, num_functions, num_names;
WalkBuffer(local_buffer.get(), buffer_size, &num_dlls, &num_functions,
&num_names);
// The 15 interceptions on the buffer (to the child) should be grouped on 6
// dlls. Only four interceptions are using an explicit name for the
// interceptor function.
EXPECT_EQ(6, num_dlls);
EXPECT_EQ(15, num_functions);
EXPECT_EQ(4, num_names);
}
} // namespace sandbox
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