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// Copyright (c) 2011 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_policy.h"
#include <stdint.h>
#include <string>
#include "base/memory/free_deleter.h"
#include "base/memory/scoped_ptr.h"
#include "sandbox/win/src/ipc_tags.h"
#include "sandbox/win/src/nt_internals.h"
#include "sandbox/win/src/policy_engine_opcodes.h"
#include "sandbox/win/src/policy_params.h"
#include "sandbox/win/src/sandbox_types.h"
#include "sandbox/win/src/win_utils.h"
namespace {
// These are the only safe rights that can be given to a sandboxed
// process for the process created by the broker. All others are potential
// vectors of privilege elevation.
const DWORD kProcessRights = SYNCHRONIZE |
PROCESS_QUERY_INFORMATION |
PROCESS_QUERY_LIMITED_INFORMATION |
PROCESS_TERMINATE |
PROCESS_SUSPEND_RESUME;
const DWORD kThreadRights = SYNCHRONIZE |
THREAD_TERMINATE |
THREAD_SUSPEND_RESUME |
THREAD_QUERY_INFORMATION |
THREAD_QUERY_LIMITED_INFORMATION |
THREAD_SET_LIMITED_INFORMATION;
// Creates a child process and duplicates the handles to 'target_process'. The
// remaining parameters are the same as CreateProcess().
BOOL CreateProcessExWHelper(HANDLE target_process, BOOL give_full_access,
LPCWSTR lpApplicationName, LPWSTR lpCommandLine,
LPSECURITY_ATTRIBUTES lpProcessAttributes,
LPSECURITY_ATTRIBUTES lpThreadAttributes,
BOOL bInheritHandles, DWORD dwCreationFlags,
LPVOID lpEnvironment, LPCWSTR lpCurrentDirectory,
LPSTARTUPINFOW lpStartupInfo,
LPPROCESS_INFORMATION lpProcessInformation) {
if (!::CreateProcessW(lpApplicationName, lpCommandLine, lpProcessAttributes,
lpThreadAttributes, bInheritHandles, dwCreationFlags,
lpEnvironment, lpCurrentDirectory, lpStartupInfo,
lpProcessInformation)) {
return FALSE;
}
DWORD process_access = kProcessRights;
DWORD thread_access = kThreadRights;
if (give_full_access) {
process_access = PROCESS_ALL_ACCESS;
thread_access = THREAD_ALL_ACCESS;
}
if (!::DuplicateHandle(::GetCurrentProcess(), lpProcessInformation->hProcess,
target_process, &lpProcessInformation->hProcess,
process_access, FALSE, DUPLICATE_CLOSE_SOURCE)) {
::CloseHandle(lpProcessInformation->hThread);
return FALSE;
}
if (!::DuplicateHandle(::GetCurrentProcess(), lpProcessInformation->hThread,
target_process, &lpProcessInformation->hThread,
thread_access, FALSE, DUPLICATE_CLOSE_SOURCE)) {
return FALSE;
}
return TRUE;
}
}
namespace sandbox {
bool ProcessPolicy::GenerateRules(const wchar_t* name,
TargetPolicy::Semantics semantics,
LowLevelPolicy* policy) {
scoped_ptr<PolicyRule> process;
switch (semantics) {
case TargetPolicy::PROCESS_MIN_EXEC: {
process.reset(new PolicyRule(GIVE_READONLY));
break;
};
case TargetPolicy::PROCESS_ALL_EXEC: {
process.reset(new PolicyRule(GIVE_ALLACCESS));
break;
};
default: {
return false;
};
}
if (!process->AddStringMatch(IF, NameBased::NAME, name, CASE_INSENSITIVE)) {
return false;
}
if (!policy->AddRule(IPC_CREATEPROCESSW_TAG, process.get())) {
return false;
}
return true;
}
NTSTATUS ProcessPolicy::OpenThreadAction(const ClientInfo& client_info,
uint32_t desired_access,
uint32_t thread_id,
HANDLE* handle) {
*handle = NULL;
NtOpenThreadFunction NtOpenThread = NULL;
ResolveNTFunctionPtr("NtOpenThread", &NtOpenThread);
OBJECT_ATTRIBUTES attributes = {0};
attributes.Length = sizeof(attributes);
CLIENT_ID client_id = {0};
client_id.UniqueProcess = reinterpret_cast<PVOID>(
static_cast<ULONG_PTR>(client_info.process_id));
client_id.UniqueThread =
reinterpret_cast<PVOID>(static_cast<ULONG_PTR>(thread_id));
HANDLE local_handle = NULL;
NTSTATUS status = NtOpenThread(&local_handle, desired_access, &attributes,
&client_id);
if (NT_SUCCESS(status)) {
if (!::DuplicateHandle(::GetCurrentProcess(), local_handle,
client_info.process, handle, 0, FALSE,
DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS)) {
return STATUS_ACCESS_DENIED;
}
}
return status;
}
NTSTATUS ProcessPolicy::OpenProcessAction(const ClientInfo& client_info,
uint32_t desired_access,
uint32_t process_id,
HANDLE* handle) {
*handle = NULL;
NtOpenProcessFunction NtOpenProcess = NULL;
ResolveNTFunctionPtr("NtOpenProcess", &NtOpenProcess);
if (client_info.process_id != process_id)
return STATUS_ACCESS_DENIED;
OBJECT_ATTRIBUTES attributes = {0};
attributes.Length = sizeof(attributes);
CLIENT_ID client_id = {0};
client_id.UniqueProcess = reinterpret_cast<PVOID>(
static_cast<ULONG_PTR>(client_info.process_id));
HANDLE local_handle = NULL;
NTSTATUS status = NtOpenProcess(&local_handle, desired_access, &attributes,
&client_id);
if (NT_SUCCESS(status)) {
if (!::DuplicateHandle(::GetCurrentProcess(), local_handle,
client_info.process, handle, 0, FALSE,
DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS)) {
return STATUS_ACCESS_DENIED;
}
}
return status;
}
NTSTATUS ProcessPolicy::OpenProcessTokenAction(const ClientInfo& client_info,
HANDLE process,
uint32_t desired_access,
HANDLE* handle) {
*handle = NULL;
NtOpenProcessTokenFunction NtOpenProcessToken = NULL;
ResolveNTFunctionPtr("NtOpenProcessToken", &NtOpenProcessToken);
if (CURRENT_PROCESS != process)
return STATUS_ACCESS_DENIED;
HANDLE local_handle = NULL;
NTSTATUS status = NtOpenProcessToken(client_info.process, desired_access,
&local_handle);
if (NT_SUCCESS(status)) {
if (!::DuplicateHandle(::GetCurrentProcess(), local_handle,
client_info.process, handle, 0, FALSE,
DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS)) {
return STATUS_ACCESS_DENIED;
}
}
return status;
}
NTSTATUS ProcessPolicy::OpenProcessTokenExAction(const ClientInfo& client_info,
HANDLE process,
uint32_t desired_access,
uint32_t attributes,
HANDLE* handle) {
*handle = NULL;
NtOpenProcessTokenExFunction NtOpenProcessTokenEx = NULL;
ResolveNTFunctionPtr("NtOpenProcessTokenEx", &NtOpenProcessTokenEx);
if (CURRENT_PROCESS != process)
return STATUS_ACCESS_DENIED;
HANDLE local_handle = NULL;
NTSTATUS status = NtOpenProcessTokenEx(client_info.process, desired_access,
attributes, &local_handle);
if (NT_SUCCESS(status)) {
if (!::DuplicateHandle(::GetCurrentProcess(), local_handle,
client_info.process, handle, 0, FALSE,
DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS)) {
return STATUS_ACCESS_DENIED;
}
}
return status;
}
DWORD ProcessPolicy::CreateProcessWAction(EvalResult eval_result,
const ClientInfo& client_info,
const base::string16 &app_name,
const base::string16 &command_line,
PROCESS_INFORMATION* process_info) {
// The only action supported is ASK_BROKER which means create the process.
if (GIVE_ALLACCESS != eval_result && GIVE_READONLY != eval_result) {
return ERROR_ACCESS_DENIED;
}
STARTUPINFO startup_info = {0};
startup_info.cb = sizeof(startup_info);
scoped_ptr<wchar_t, base::FreeDeleter>
cmd_line(_wcsdup(command_line.c_str()));
BOOL should_give_full_access = (GIVE_ALLACCESS == eval_result);
if (!CreateProcessExWHelper(client_info.process, should_give_full_access,
app_name.c_str(), cmd_line.get(), NULL, NULL,
FALSE, 0, NULL, NULL, &startup_info,
process_info)) {
return ERROR_ACCESS_DENIED;
}
return ERROR_SUCCESS;
}
DWORD ProcessPolicy::CreateThreadAction(
const ClientInfo& client_info,
const SIZE_T stack_size,
const LPTHREAD_START_ROUTINE start_address,
const LPVOID parameter,
const DWORD creation_flags,
LPDWORD thread_id,
HANDLE* handle) {
HANDLE local_handle =
::CreateRemoteThread(client_info.process, nullptr, stack_size,
start_address, parameter, creation_flags, thread_id);
if (!local_handle) {
return ::GetLastError();
}
if (!::DuplicateHandle(::GetCurrentProcess(), local_handle,
client_info.process, handle, 0, FALSE,
DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS)) {
return ERROR_ACCESS_DENIED;
}
return ERROR_SUCCESS;
}
} // namespace sandbox
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