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// Copyright (c) 2012 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/handle_policy.h"
#include <string>
#include "base/win/scoped_handle.h"
#include "sandbox/win/src/broker_services.h"
#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_types.h"
#include "sandbox/win/src/sandbox_utils.h"
namespace sandbox {
bool HandlePolicy::GenerateRules(const wchar_t* type_name,
TargetPolicy::Semantics semantics,
LowLevelPolicy* policy) {
PolicyRule duplicate_rule(ASK_BROKER);
switch (semantics) {
case TargetPolicy::HANDLES_DUP_ANY: {
if (!duplicate_rule.AddNumberMatch(IF_NOT, HandleTarget::TARGET,
::GetCurrentProcessId(), EQUAL)) {
return false;
}
break;
}
case TargetPolicy::HANDLES_DUP_BROKER: {
if (!duplicate_rule.AddNumberMatch(IF, HandleTarget::TARGET,
::GetCurrentProcessId(), EQUAL)) {
return false;
}
break;
}
default:
return false;
}
if (!duplicate_rule.AddStringMatch(IF, HandleTarget::NAME, type_name,
CASE_INSENSITIVE)) {
return false;
}
if (!policy->AddRule(IpcTag::DUPLICATEHANDLEPROXY, &duplicate_rule)) {
return false;
}
return true;
}
DWORD HandlePolicy::DuplicateHandleProxyAction(EvalResult eval_result,
HANDLE source_handle,
DWORD target_process_id,
HANDLE* target_handle,
DWORD desired_access,
DWORD options) {
// The only action supported is ASK_BROKER which means duplicate the handle.
if (ASK_BROKER != eval_result) {
return ERROR_ACCESS_DENIED;
}
base::win::ScopedHandle remote_target_process;
if (target_process_id != ::GetCurrentProcessId()) {
// Sandboxed children are dynamic, so we check that manually.
if (!BrokerServicesBase::GetInstance()->IsSafeDuplicationTarget(
target_process_id)) {
return ERROR_ACCESS_DENIED;
}
remote_target_process.Set(::OpenProcess(PROCESS_DUP_HANDLE, FALSE,
target_process_id));
if (!remote_target_process.IsValid())
return ::GetLastError();
}
// If the policy didn't block us and we have no valid target, then the broker
// (this process) is the valid target.
HANDLE target_process = remote_target_process.IsValid() ?
remote_target_process.Get() : ::GetCurrentProcess();
if (!::DuplicateHandle(::GetCurrentProcess(), source_handle, target_process,
target_handle, desired_access, FALSE,
options)) {
return ::GetLastError();
}
return ERROR_SUCCESS;
}
} // namespace sandbox
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