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// Copyright 2019 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/signed_policy.h"
#include <stdint.h>
#include <string>
#include "sandbox/win/src/ipc_tags.h"
#include "sandbox/win/src/policy_engine_opcodes.h"
#include "sandbox/win/src/policy_params.h"
#include "sandbox/win/src/sandbox_policy.h"
#include "sandbox/win/src/sandbox_utils.h"
#include "sandbox/win/src/win_utils.h"
namespace {
bool IsValidNtPath(const base::FilePath& name) {
UNICODE_STRING uni_name;
OBJECT_ATTRIBUTES obj_attr;
sandbox::InitObjectAttribs(name.value(), OBJ_CASE_INSENSITIVE, nullptr,
&obj_attr, &uni_name, nullptr);
NtQueryAttributesFileFunction NtQueryAttributesFile = nullptr;
ResolveNTFunctionPtr("NtQueryAttributesFile", &NtQueryAttributesFile);
FILE_BASIC_INFORMATION file_info;
return NtQueryAttributesFile &&
NT_SUCCESS(NtQueryAttributesFile(&obj_attr, &file_info));
}
} // namespace
namespace sandbox {
bool SignedPolicy::GenerateRules(const wchar_t* name,
TargetPolicy::Semantics semantics,
LowLevelPolicy* policy) {
// Only support one semantic.
if (TargetPolicy::SIGNED_ALLOW_LOAD != semantics) {
return false;
}
base::FilePath file_path(name);
base::FilePath nt_filename;
std::wstring nt_path_name;
if (GetNtPathFromWin32Path(file_path.DirName().value().c_str(),
&nt_path_name)) {
base::FilePath nt_path(nt_path_name);
nt_filename = nt_path.Append(file_path.BaseName());
} else if (IsValidNtPath(file_path)) {
nt_filename = std::move(file_path);
} else {
return false;
}
// Create a rule to ASK_BROKER if name matches.
PolicyRule signed_policy(ASK_BROKER);
if (!signed_policy.AddStringMatch(
IF, NameBased::NAME, nt_filename.value().c_str(), CASE_INSENSITIVE)) {
return false;
}
if (!policy->AddRule(IpcTag::NTCREATESECTION, &signed_policy)) {
return false;
}
return true;
}
NTSTATUS SignedPolicy::CreateSectionAction(
EvalResult eval_result,
const ClientInfo& client_info,
const base::win::ScopedHandle& local_file_handle,
HANDLE* target_section_handle) {
NtCreateSectionFunction NtCreateSection = nullptr;
ResolveNTFunctionPtr("NtCreateSection", &NtCreateSection);
// The only action supported is ASK_BROKER which means create the requested
// section as specified.
if (ASK_BROKER != eval_result)
return false;
HANDLE local_section_handle = nullptr;
NTSTATUS status = NtCreateSection(&local_section_handle,
SECTION_QUERY | SECTION_MAP_WRITE |
SECTION_MAP_READ | SECTION_MAP_EXECUTE,
nullptr, 0, PAGE_EXECUTE, SEC_IMAGE,
local_file_handle.Get());
if (!local_section_handle)
return status;
// Duplicate section handle back to the target.
if (!::DuplicateHandle(::GetCurrentProcess(), local_section_handle,
client_info.process, target_section_handle, 0, false,
DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS)) {
return STATUS_ACCESS_DENIED;
}
return status;
}
} // namespace sandbox
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