You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
121 lines
4.0 KiB
121 lines
4.0 KiB
4 months ago
|
/*
|
||
|
|
* Copyright (C) 2012 The Android Open Source Project
|
||
|
|
*
|
||
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
* you may not use this file except in compliance with the License.
|
||
|
|
* You may obtain a copy of the License at
|
||
|
|
*
|
||
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
*
|
||
|
|
* Unless required by applicable law or agreed to in writing, software
|
||
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
* See the License for the specific language governing permissions and
|
||
|
|
* limitations under the License.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef _FIREWALL_CONTROLLER_H
|
||
|
|
#define _FIREWALL_CONTROLLER_H
|
||
|
|
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <mutex>
|
||
|
|
#include <set>
|
||
|
|
#include <string>
|
||
|
|
#include <vector>
|
||
|
|
|
||
|
|
#include "android/net/INetd.h"
|
||
|
|
|
||
|
|
#include "NetdConstants.h"
|
||
|
|
#include "bpf/BpfUtils.h"
|
||
|
|
|
||
|
|
namespace android {
|
||
|
|
namespace net {
|
||
|
|
|
||
|
|
enum FirewallRule { ALLOW = INetd::FIREWALL_RULE_ALLOW, DENY = INetd::FIREWALL_RULE_DENY };
|
||
|
|
|
||
|
|
// ALLOWLIST means the firewall denies all by default, uids must be explicitly ALLOWed
|
||
|
|
// DENYLIST means the firewall allows all by default, uids must be explicitly DENYed
|
||
|
|
|
||
|
|
enum FirewallType { ALLOWLIST = INetd::FIREWALL_ALLOWLIST, DENYLIST = INetd::FIREWALL_DENYLIST };
|
||
|
|
|
||
|
|
enum ChildChain {
|
||
|
|
NONE = INetd::FIREWALL_CHAIN_NONE,
|
||
|
|
DOZABLE = INetd::FIREWALL_CHAIN_DOZABLE,
|
||
|
|
STANDBY = INetd::FIREWALL_CHAIN_STANDBY,
|
||
|
|
POWERSAVE = INetd::FIREWALL_CHAIN_POWERSAVE,
|
||
|
|
RESTRICTED = INetd::FIREWALL_CHAIN_RESTRICTED,
|
||
|
|
INVALID_CHAIN
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Simple firewall that drops all packets except those matching explicitly
|
||
|
|
* defined ALLOW rules.
|
||
|
|
*
|
||
|
|
* Methods in this class must be called when holding a write lock on |lock|, and may not call
|
||
|
|
* any other controller without explicitly managing that controller's lock. There are currently
|
||
|
|
* no such methods.
|
||
|
|
*/
|
||
|
|
class FirewallController {
|
||
|
|
public:
|
||
|
|
FirewallController();
|
||
|
|
|
||
|
|
int setupIptablesHooks(void);
|
||
|
|
|
||
|
|
int setFirewallType(FirewallType);
|
||
|
|
int resetFirewall(void);
|
||
|
|
int isFirewallEnabled(void);
|
||
|
|
|
||
|
|
/* Match traffic going in/out over the given iface. */
|
||
|
|
int setInterfaceRule(const char*, FirewallRule);
|
||
|
|
/* Match traffic owned by given UID. This is specific to a particular chain. */
|
||
|
|
int setUidRule(ChildChain, int, FirewallRule);
|
||
|
|
|
||
|
|
int enableChildChains(ChildChain, bool);
|
||
|
|
|
||
|
|
int replaceUidChain(const std::string&, bool, const std::vector<int32_t>&);
|
||
|
|
|
||
|
|
static std::string makeCriticalCommands(IptablesTarget target, const char* chainName);
|
||
|
|
static uid_t discoverMaximumValidUid(const std::string& fileName);
|
||
|
|
|
||
|
|
static const char* TABLE;
|
||
|
|
|
||
|
|
static const char* LOCAL_INPUT;
|
||
|
|
static const char* LOCAL_OUTPUT;
|
||
|
|
static const char* LOCAL_FORWARD;
|
||
|
|
|
||
|
|
static const char* LOCAL_DOZABLE;
|
||
|
|
static const char* LOCAL_STANDBY;
|
||
|
|
static const char* LOCAL_POWERSAVE;
|
||
|
|
static const char* LOCAL_RESTRICTED;
|
||
|
|
|
||
|
|
static const char* ICMPV6_TYPES[];
|
||
|
|
|
||
|
|
std::mutex lock;
|
||
|
|
|
||
|
|
protected:
|
||
|
|
friend class FirewallControllerTest;
|
||
|
|
std::string makeUidRules(IptablesTarget target, const char* name, bool isAllowlist,
|
||
|
|
const std::vector<int32_t>& uids);
|
||
|
|
static int (*execIptablesRestore)(IptablesTarget target, const std::string& commands);
|
||
|
|
|
||
|
|
private:
|
||
|
|
// Netd supports two cases, in both of which mMaxUid that derives from the uid mapping is const:
|
||
|
|
// - netd runs in a root namespace which contains all UIDs.
|
||
|
|
// - netd runs in a user namespace where the uid mapping is written once before netd starts.
|
||
|
|
// In that case, an attempt to write more than once to a uid_map file in a user namespace
|
||
|
|
// fails with EPERM. Netd can therefore assumes the max valid uid to be const.
|
||
|
|
const uid_t mMaxUid;
|
||
|
|
FirewallType mFirewallType;
|
||
|
|
bool mUseBpfOwnerMatch;
|
||
|
|
std::set<std::string> mIfaceRules;
|
||
|
|
int attachChain(const char*, const char*);
|
||
|
|
int detachChain(const char*, const char*);
|
||
|
|
int createChain(const char*, FirewallType);
|
||
|
|
FirewallType getFirewallType(ChildChain);
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace net
|
||
|
|
} // namespace android
|
||
|
|
|
||
|
|
#endif
|