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// Copyright (c) 2013 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_thread_interception.h"
#include <stdint.h>
#include "sandbox/win/src/crosscall_client.h"
#include "sandbox/win/src/ipc_tags.h"
#include "sandbox/win/src/policy_params.h"
#include "sandbox/win/src/policy_target.h"
#include "sandbox/win/src/sandbox_factory.h"
#include "sandbox/win/src/sandbox_nt_util.h"
#include "sandbox/win/src/sharedmem_ipc_client.h"
#include "sandbox/win/src/target_services.h"
#include "mozilla/sandboxing/sandboxLogging.h"
namespace sandbox {
SANDBOX_INTERCEPT NtExports g_nt;
// Hooks NtOpenThread and proxy the call to the broker if it's trying to
// open a thread in the same process.
NTSTATUS WINAPI TargetNtOpenThread(NtOpenThreadFunction orig_OpenThread,
PHANDLE thread, ACCESS_MASK desired_access,
POBJECT_ATTRIBUTES object_attributes,
PCLIENT_ID client_id) {
NTSTATUS status = orig_OpenThread(thread, desired_access, object_attributes,
client_id);
if (NT_SUCCESS(status))
return status;
mozilla::sandboxing::LogBlocked("NtOpenThread");
do {
if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
break;
if (!client_id)
break;
uint32_t thread_id = 0;
bool should_break = false;
__try {
// We support only the calls for the current process
if (NULL != client_id->UniqueProcess)
should_break = true;
// Object attributes should be NULL or empty.
if (!should_break && NULL != object_attributes) {
if (0 != object_attributes->Attributes ||
NULL != object_attributes->ObjectName ||
NULL != object_attributes->RootDirectory ||
NULL != object_attributes->SecurityDescriptor ||
NULL != object_attributes->SecurityQualityOfService) {
should_break = true;
}
}
thread_id = static_cast<uint32_t>(
reinterpret_cast<ULONG_PTR>(client_id->UniqueThread));
} __except(EXCEPTION_EXECUTE_HANDLER) {
break;
}
if (should_break)
break;
if (!ValidParameter(thread, sizeof(HANDLE), WRITE))
break;
void* memory = GetGlobalIPCMemory();
if (NULL == memory)
break;
SharedMemIPCClient ipc(memory);
CrossCallReturn answer = {0};
ResultCode code = CrossCall(ipc, IPC_NTOPENTHREAD_TAG, desired_access,
thread_id, &answer);
if (SBOX_ALL_OK != code)
break;
if (!NT_SUCCESS(answer.nt_status))
// The nt_status here is most likely STATUS_INVALID_CID because
// in the broker we set the process id in the CID (client ID) param
// to be the current process. If you try to open a thread from another
// process you will get this INVALID_CID error. On the other hand, if you
// try to open a thread in your own process, it should return success.
// We don't want to return STATUS_INVALID_CID here, so we return the
// return of the original open thread status, which is most likely
// STATUS_ACCESS_DENIED.
break;
__try {
// Write the output parameters.
*thread = answer.handle;
} __except(EXCEPTION_EXECUTE_HANDLER) {
break;
}
mozilla::sandboxing::LogAllowed("NtOpenThread");
return answer.nt_status;
} while (false);
return status;
}
// Hooks NtOpenProcess and proxy the call to the broker if it's trying to
// open the current process.
NTSTATUS WINAPI TargetNtOpenProcess(NtOpenProcessFunction orig_OpenProcess,
PHANDLE process, ACCESS_MASK desired_access,
POBJECT_ATTRIBUTES object_attributes,
PCLIENT_ID client_id) {
NTSTATUS status = orig_OpenProcess(process, desired_access, object_attributes,
client_id);
if (NT_SUCCESS(status))
return status;
do {
if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
break;
if (!client_id)
break;
uint32_t process_id = 0;
bool should_break = false;
__try {
// Object attributes should be NULL or empty.
if (!should_break && NULL != object_attributes) {
if (0 != object_attributes->Attributes ||
NULL != object_attributes->ObjectName ||
NULL != object_attributes->RootDirectory ||
NULL != object_attributes->SecurityDescriptor ||
NULL != object_attributes->SecurityQualityOfService) {
should_break = true;
}
}
process_id = static_cast<uint32_t>(
reinterpret_cast<ULONG_PTR>(client_id->UniqueProcess));
} __except(EXCEPTION_EXECUTE_HANDLER) {
break;
}
if (should_break)
break;
if (!ValidParameter(process, sizeof(HANDLE), WRITE))
break;
void* memory = GetGlobalIPCMemory();
if (NULL == memory)
break;
SharedMemIPCClient ipc(memory);
CrossCallReturn answer = {0};
ResultCode code = CrossCall(ipc, IPC_NTOPENPROCESS_TAG, desired_access,
process_id, &answer);
if (SBOX_ALL_OK != code)
break;
if (!NT_SUCCESS(answer.nt_status))
return answer.nt_status;
__try {
// Write the output parameters.
*process = answer.handle;
} __except(EXCEPTION_EXECUTE_HANDLER) {
break;
}
return answer.nt_status;
} while (false);
return status;
}
NTSTATUS WINAPI TargetNtOpenProcessToken(
NtOpenProcessTokenFunction orig_OpenProcessToken, HANDLE process,
ACCESS_MASK desired_access, PHANDLE token) {
NTSTATUS status = orig_OpenProcessToken(process, desired_access, token);
if (NT_SUCCESS(status))
return status;
mozilla::sandboxing::LogBlocked("NtOpenProcessToken");
do {
if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
break;
if (CURRENT_PROCESS != process)
break;
if (!ValidParameter(token, sizeof(HANDLE), WRITE))
break;
void* memory = GetGlobalIPCMemory();
if (NULL == memory)
break;
SharedMemIPCClient ipc(memory);
CrossCallReturn answer = {0};
ResultCode code = CrossCall(ipc, IPC_NTOPENPROCESSTOKEN_TAG, process,
desired_access, &answer);
if (SBOX_ALL_OK != code)
break;
if (!NT_SUCCESS(answer.nt_status))
return answer.nt_status;
__try {
// Write the output parameters.
*token = answer.handle;
} __except(EXCEPTION_EXECUTE_HANDLER) {
break;
}
mozilla::sandboxing::LogAllowed("NtOpenProcessToken");
return answer.nt_status;
} while (false);
return status;
}
NTSTATUS WINAPI TargetNtOpenProcessTokenEx(
NtOpenProcessTokenExFunction orig_OpenProcessTokenEx, HANDLE process,
ACCESS_MASK desired_access, ULONG handle_attributes, PHANDLE token) {
NTSTATUS status = orig_OpenProcessTokenEx(process, desired_access,
handle_attributes, token);
if (NT_SUCCESS(status))
return status;
mozilla::sandboxing::LogBlocked("NtOpenProcessTokenEx");
do {
if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
break;
if (CURRENT_PROCESS != process)
break;
if (!ValidParameter(token, sizeof(HANDLE), WRITE))
break;
void* memory = GetGlobalIPCMemory();
if (NULL == memory)
break;
SharedMemIPCClient ipc(memory);
CrossCallReturn answer = {0};
ResultCode code = CrossCall(ipc, IPC_NTOPENPROCESSTOKENEX_TAG, process,
desired_access, handle_attributes, &answer);
if (SBOX_ALL_OK != code)
break;
if (!NT_SUCCESS(answer.nt_status))
return answer.nt_status;
__try {
// Write the output parameters.
*token = answer.handle;
} __except(EXCEPTION_EXECUTE_HANDLER) {
break;
}
mozilla::sandboxing::LogAllowed("NtOpenProcessTokenEx");
return answer.nt_status;
} while (false);
return status;
}
BOOL WINAPI TargetCreateProcessW(CreateProcessWFunction orig_CreateProcessW,
LPCWSTR application_name, LPWSTR command_line,
LPSECURITY_ATTRIBUTES process_attributes,
LPSECURITY_ATTRIBUTES thread_attributes,
BOOL inherit_handles, DWORD flags,
LPVOID environment, LPCWSTR current_directory,
LPSTARTUPINFOW startup_info,
LPPROCESS_INFORMATION process_information) {
if (SandboxFactory::GetTargetServices()->GetState()->IsCsrssConnected() &&
orig_CreateProcessW(application_name, command_line, process_attributes,
thread_attributes, inherit_handles, flags,
environment, current_directory, startup_info,
process_information)) {
return TRUE;
}
mozilla::sandboxing::LogBlocked("CreateProcessW", application_name);
// We don't trust that the IPC can work this early.
if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
return FALSE;
// Don't call GetLastError before InitCalled() succeeds because kernel32 may
// not be mapped yet.
DWORD original_error = ::GetLastError();
do {
if (!ValidParameter(process_information, sizeof(PROCESS_INFORMATION),
WRITE))
break;
void* memory = GetGlobalIPCMemory();
if (NULL == memory)
break;
const wchar_t* cur_dir = NULL;
wchar_t current_directory[MAX_PATH];
DWORD result = ::GetCurrentDirectory(MAX_PATH, current_directory);
if (0 != result && result < MAX_PATH)
cur_dir = current_directory;
SharedMemIPCClient ipc(memory);
CrossCallReturn answer = {0};
InOutCountedBuffer proc_info(process_information,
sizeof(PROCESS_INFORMATION));
ResultCode code = CrossCall(ipc, IPC_CREATEPROCESSW_TAG, application_name,
command_line, cur_dir, proc_info, &answer);
if (SBOX_ALL_OK != code)
break;
::SetLastError(answer.win32_result);
if (ERROR_SUCCESS != answer.win32_result)
return FALSE;
mozilla::sandboxing::LogAllowed("CreateProcessW", application_name);
return TRUE;
} while (false);
::SetLastError(original_error);
return FALSE;
}
BOOL WINAPI TargetCreateProcessA(CreateProcessAFunction orig_CreateProcessA,
LPCSTR application_name, LPSTR command_line,
LPSECURITY_ATTRIBUTES process_attributes,
LPSECURITY_ATTRIBUTES thread_attributes,
BOOL inherit_handles, DWORD flags,
LPVOID environment, LPCSTR current_directory,
LPSTARTUPINFOA startup_info,
LPPROCESS_INFORMATION process_information) {
if (orig_CreateProcessA(application_name, command_line, process_attributes,
thread_attributes, inherit_handles, flags,
environment, current_directory, startup_info,
process_information)) {
return TRUE;
}
mozilla::sandboxing::LogBlocked("CreateProcessA", application_name);
// We don't trust that the IPC can work this early.
if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
return FALSE;
// Don't call GetLastError before InitCalled() succeeds because kernel32 may
// not be mapped yet.
DWORD original_error = ::GetLastError();
do {
if (!ValidParameter(process_information, sizeof(PROCESS_INFORMATION),
WRITE))
break;
void* memory = GetGlobalIPCMemory();
if (NULL == memory)
break;
// Convert the input params to unicode.
UNICODE_STRING *cmd_unicode = NULL;
UNICODE_STRING *app_unicode = NULL;
if (command_line) {
cmd_unicode = AnsiToUnicode(command_line);
if (!cmd_unicode)
break;
}
if (application_name) {
app_unicode = AnsiToUnicode(application_name);
if (!app_unicode) {
operator delete(cmd_unicode, NT_ALLOC);
break;
}
}
const wchar_t* cmd_line = cmd_unicode ? cmd_unicode->Buffer : NULL;
const wchar_t* app_name = app_unicode ? app_unicode->Buffer : NULL;
const wchar_t* cur_dir = NULL;
wchar_t current_directory[MAX_PATH];
DWORD result = ::GetCurrentDirectory(MAX_PATH, current_directory);
if (0 != result && result < MAX_PATH)
cur_dir = current_directory;
SharedMemIPCClient ipc(memory);
CrossCallReturn answer = {0};
InOutCountedBuffer proc_info(process_information,
sizeof(PROCESS_INFORMATION));
ResultCode code = CrossCall(ipc, IPC_CREATEPROCESSW_TAG, app_name,
cmd_line, cur_dir, proc_info, &answer);
operator delete(cmd_unicode, NT_ALLOC);
operator delete(app_unicode, NT_ALLOC);
if (SBOX_ALL_OK != code)
break;
::SetLastError(answer.win32_result);
if (ERROR_SUCCESS != answer.win32_result)
return FALSE;
mozilla::sandboxing::LogAllowed("CreateProcessA", application_name);
return TRUE;
} while (false);
::SetLastError(original_error);
return FALSE;
}
} // namespace sandbox
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