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// Copyright (c) 2006-2008 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 <string>
#include "sandbox/src/sync_policy.h"
#include "base/logging.h"
#include "sandbox/src/ipc_tags.h"
#include "sandbox/src/policy_engine_opcodes.h"
#include "sandbox/src/policy_params.h"
#include "sandbox/src/sandbox_types.h"
#include "sandbox/src/sandbox_utils.h"
namespace sandbox {
bool SyncPolicy::GenerateRules(const wchar_t* name,
TargetPolicy::Semantics semantics,
LowLevelPolicy* policy) {
std::wstring mod_name(name);
if (mod_name.empty()) {
return false;
}
if (TargetPolicy::EVENTS_ALLOW_ANY != semantics &&
TargetPolicy::EVENTS_ALLOW_READONLY != semantics) {
// Other flags are not valid for sync policy yet.
NOTREACHED();
return false;
}
// Add the open rule.
EvalResult result = ASK_BROKER;
PolicyRule open(result);
if (!open.AddStringMatch(IF, OpenEventParams::NAME, name, CASE_INSENSITIVE))
return false;
if (TargetPolicy::EVENTS_ALLOW_READONLY == semantics) {
// We consider all flags that are not known to be readonly as potentially
// used for write.
DWORD allowed_flags = SYNCHRONIZE | GENERIC_READ | READ_CONTROL;
DWORD restricted_flags = ~allowed_flags;
open.AddNumberMatch(IF_NOT, OpenEventParams::ACCESS, restricted_flags, AND);
}
if (!policy->AddRule(IPC_OPENEVENT_TAG, &open))
return false;
// If it's not a read only, add the create rule.
if (TargetPolicy::EVENTS_ALLOW_READONLY != semantics) {
PolicyRule create(result);
if (!create.AddStringMatch(IF, NameBased::NAME, name, CASE_INSENSITIVE))
return false;
if (!policy->AddRule(IPC_CREATEEVENT_TAG, &create))
return false;
}
return true;
}
DWORD SyncPolicy::CreateEventAction(EvalResult eval_result,
const ClientInfo& client_info,
const std::wstring &event_name,
uint32 manual_reset,
uint32 initial_state,
HANDLE *handle) {
// The only action supported is ASK_BROKER which means create the requested
// file as specified.
if (ASK_BROKER != eval_result)
return false;
HANDLE local_handle = ::CreateEvent(NULL, manual_reset, initial_state,
event_name.c_str());
if (NULL == local_handle)
return ::GetLastError();
if (!::DuplicateHandle(::GetCurrentProcess(), local_handle,
client_info.process, handle, 0, FALSE,
DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS)) {
::CloseHandle(local_handle);
return ERROR_ACCESS_DENIED;
}
return ERROR_SUCCESS;
}
DWORD SyncPolicy::OpenEventAction(EvalResult eval_result,
const ClientInfo& client_info,
const std::wstring &event_name,
uint32 desired_access,
uint32 inherit_handle,
HANDLE *handle) {
// The only action supported is ASK_BROKER which means create the requested
// file as specified.
if (ASK_BROKER != eval_result)
return false;
HANDLE local_handle = ::OpenEvent(desired_access, FALSE,
event_name.c_str());
if (NULL == local_handle)
return ::GetLastError();
if (!::DuplicateHandle(::GetCurrentProcess(), local_handle,
client_info.process, handle, 0, inherit_handle,
DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS)) {
::CloseHandle(local_handle);
return ERROR_ACCESS_DENIED;
}
return ERROR_SUCCESS;
}
} // namespace sandbox
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