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95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "sandbox/win/src/handle_policy.h"
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#include <string>
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#include "base/win/scoped_handle.h"
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#include "sandbox/win/src/broker_services.h"
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#include "sandbox/win/src/ipc_tags.h"
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#include "sandbox/win/src/policy_engine_opcodes.h"
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#include "sandbox/win/src/policy_params.h"
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#include "sandbox/win/src/sandbox_types.h"
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#include "sandbox/win/src/sandbox_utils.h"
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namespace sandbox {
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bool HandlePolicy::GenerateRules(const wchar_t* type_name,
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TargetPolicy::Semantics semantics,
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LowLevelPolicy* policy) {
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PolicyRule duplicate_rule(ASK_BROKER);
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switch (semantics) {
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case TargetPolicy::HANDLES_DUP_ANY: {
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if (!duplicate_rule.AddNumberMatch(IF_NOT, HandleTarget::TARGET,
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::GetCurrentProcessId(), EQUAL)) {
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return false;
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}
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break;
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}
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case TargetPolicy::HANDLES_DUP_BROKER: {
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if (!duplicate_rule.AddNumberMatch(IF, HandleTarget::TARGET,
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::GetCurrentProcessId(), EQUAL)) {
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return false;
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}
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break;
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}
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default:
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return false;
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}
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if (!duplicate_rule.AddStringMatch(IF, HandleTarget::NAME, type_name,
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CASE_INSENSITIVE)) {
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return false;
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}
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if (!policy->AddRule(IPC_DUPLICATEHANDLEPROXY_TAG, &duplicate_rule)) {
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return false;
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}
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return true;
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}
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DWORD HandlePolicy::DuplicateHandleProxyAction(EvalResult eval_result,
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const ClientInfo& client_info,
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HANDLE source_handle,
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DWORD target_process_id,
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HANDLE* target_handle,
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DWORD desired_access,
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DWORD options) {
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// The only action supported is ASK_BROKER which means duplicate the handle.
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if (ASK_BROKER != eval_result) {
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return ERROR_ACCESS_DENIED;
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}
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base::win::ScopedHandle remote_target_process;
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if (target_process_id != ::GetCurrentProcessId()) {
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// Sandboxed children are dynamic, so we check that manually.
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if (!BrokerServicesBase::GetInstance()->IsActiveTarget(target_process_id)) {
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return ERROR_ACCESS_DENIED;
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}
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remote_target_process.Set(::OpenProcess(PROCESS_DUP_HANDLE, FALSE,
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target_process_id));
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if (!remote_target_process.IsValid())
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return ::GetLastError();
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}
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// If the policy didn't block us and we have no valid target, then the broker
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// (this process) is the valid target.
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HANDLE target_process = remote_target_process.IsValid() ?
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remote_target_process.Get() : ::GetCurrentProcess();
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DWORD result = ERROR_SUCCESS;
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if (!::DuplicateHandle(client_info.process, source_handle, target_process,
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target_handle, desired_access, FALSE,
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options)) {
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return ::GetLastError();
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}
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return ERROR_SUCCESS;
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}
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} // namespace sandbox
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