mirror of
https://github.com/didyouexpectthat/zerotierone.git
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273 lines
8.2 KiB
C++
273 lines
8.2 KiB
C++
/*
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* ZeroTier One - Network Virtualization Everywhere
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* Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ZT_MEMBERSHIP_HPP
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#define ZT_MEMBERSHIP_HPP
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#include <stdint.h>
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#include "Constants.hpp"
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#include "../include/ZeroTierOne.h"
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#include "Credential.hpp"
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#include "Hashtable.hpp"
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#include "CertificateOfMembership.hpp"
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#include "Capability.hpp"
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#include "Tag.hpp"
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#include "Revocation.hpp"
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#include "NetworkConfig.hpp"
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#define ZT_MEMBERSHIP_CRED_ID_UNUSED 0xffffffffffffffffULL
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namespace ZeroTier {
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class RuntimeEnvironment;
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class Network;
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/**
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* A container for certificates of membership and other network credentials
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*
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* This is essentially a relational join between Peer and Network.
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*
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* This class is not thread safe. It must be locked externally.
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*/
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class Membership
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{
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public:
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enum AddCredentialResult
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{
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ADD_REJECTED,
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ADD_ACCEPTED_NEW,
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ADD_ACCEPTED_REDUNDANT,
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ADD_DEFERRED_FOR_WHOIS
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};
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Membership();
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/**
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* Send COM and other credentials to this peer if needed
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*
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* This checks last pushed times for our COM and for other credentials and
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* sends VERB_NETWORK_CREDENTIALS if the recipient might need them.
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*
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* @param RR Runtime environment
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* @param tPtr Thread pointer to be handed through to any callbacks called as a result of this call
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* @param now Current time
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* @param peerAddress Address of member peer (the one that this Membership describes)
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* @param nconf My network config
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* @param localCapabilityIndex Index of local capability to include (in nconf.capabilities[]) or -1 if none
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* @param force If true, send objects regardless of last push time
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*/
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void pushCredentials(const RuntimeEnvironment *RR,void *tPtr,const uint64_t now,const Address &peerAddress,const NetworkConfig &nconf,int localCapabilityIndex,const bool force);
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/**
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* Check whether we should push MULTICAST_LIKEs to this peer, and update last sent time if true
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*
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* @param now Current time
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* @return True if we should update multicasts
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*/
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inline bool multicastLikeGate(const uint64_t now)
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{
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if ((now - _lastUpdatedMulticast) >= ZT_MULTICAST_ANNOUNCE_PERIOD) {
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_lastUpdatedMulticast = now;
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return true;
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}
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return false;
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}
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/**
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* Check whether the peer represented by this Membership should be allowed on this network at all
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*
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* @param nconf Our network config
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* @return True if this peer is allowed on this network at all
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*/
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inline bool isAllowedOnNetwork(const NetworkConfig &nconf) const
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{
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if (nconf.isPublic()) return true;
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if (_com.timestamp() <= _comRevocationThreshold) return false;
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return nconf.com.agreesWith(_com);
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}
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/**
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* Check whether the peer represented by this Membership owns a given resource
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*
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* @tparam Type of resource: InetAddress or MAC
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* @param nconf Our network config
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* @param r Resource to check
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* @return True if this peer has a certificate of ownership for the given resource
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*/
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template<typename T>
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inline bool hasCertificateOfOwnershipFor(const NetworkConfig &nconf,const T &r) const
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{
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uint32_t *k = (uint32_t *)0;
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CertificateOfOwnership *v = (CertificateOfOwnership *)0;
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Hashtable< uint32_t,CertificateOfOwnership >::Iterator i(*(const_cast< Hashtable< uint32_t,CertificateOfOwnership> *>(&_remoteCoos)));
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while (i.next(k,v)) {
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if (_isCredentialTimestampValid(nconf,*v)&&(v->owns(r)))
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return true;
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}
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return false;
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}
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/**
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* Get a remote member's tag (if we have it)
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*
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* @param nconf Network configuration
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* @param id Tag ID
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* @return Pointer to tag or NULL if not found
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*/
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inline const Tag *getTag(const NetworkConfig &nconf,const uint32_t id) const
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{
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const Tag *const t = _remoteTags.get(id);
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return (((t)&&(_isCredentialTimestampValid(nconf,*t))) ? t : (Tag *)0);
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}
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/**
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* Validate and add a credential if signature is okay and it's otherwise good
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*/
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AddCredentialResult addCredential(const RuntimeEnvironment *RR,void *tPtr,const NetworkConfig &nconf,const CertificateOfMembership &com);
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/**
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* Validate and add a credential if signature is okay and it's otherwise good
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*/
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AddCredentialResult addCredential(const RuntimeEnvironment *RR,void *tPtr,const NetworkConfig &nconf,const Tag &tag);
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/**
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* Validate and add a credential if signature is okay and it's otherwise good
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*/
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AddCredentialResult addCredential(const RuntimeEnvironment *RR,void *tPtr,const NetworkConfig &nconf,const Capability &cap);
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/**
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* Validate and add a credential if signature is okay and it's otherwise good
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*/
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AddCredentialResult addCredential(const RuntimeEnvironment *RR,void *tPtr,const NetworkConfig &nconf,const CertificateOfOwnership &coo);
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/**
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* Validate and add a credential if signature is okay and it's otherwise good
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*/
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AddCredentialResult addCredential(const RuntimeEnvironment *RR,void *tPtr,const NetworkConfig &nconf,const Revocation &rev);
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/**
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* Clean internal databases of stale entries
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*
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* @param now Current time
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* @param nconf Current network configuration
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*/
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void clean(const uint64_t now,const NetworkConfig &nconf);
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/**
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* Reset last pushed time for local credentials
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*
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* This is done when we update our network configuration and our credentials have changed
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*/
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inline void resetPushState()
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{
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_lastPushedCom = 0;
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memset(&_localCredLastPushed,0,sizeof(_localCredLastPushed));
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}
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/**
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* Generates a key for the internal use in indexing credentials by type and credential ID
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*/
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static uint64_t credentialKey(const Credential::Type &t,const uint32_t i) { return (((uint64_t)t << 32) | (uint64_t)i); }
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private:
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template<typename C>
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inline bool _isCredentialTimestampValid(const NetworkConfig &nconf,const C &remoteCredential) const
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{
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const uint64_t ts = remoteCredential.timestamp();
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if (((ts >= nconf.timestamp) ? (ts - nconf.timestamp) : (nconf.timestamp - ts)) <= nconf.credentialTimeMaxDelta) {
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const uint64_t *threshold = _revocations.get(credentialKey(C::credentialType(),remoteCredential.id()));
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return ((!threshold)||(ts > *threshold));
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}
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return false;
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}
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template<typename C>
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void _cleanCredImpl(const NetworkConfig &nconf,Hashtable<uint32_t,C> &remoteCreds)
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{
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uint32_t *k = (uint32_t *)0;
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C *v = (C *)0;
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typename Hashtable<uint32_t,C>::Iterator i(remoteCreds);
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while (i.next(k,v)) {
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if (!_isCredentialTimestampValid(nconf,*v))
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remoteCreds.erase(*k);
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}
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}
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// Last time we pushed MULTICAST_LIKE(s)
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uint64_t _lastUpdatedMulticast;
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// Last time we pushed our COM to this peer
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uint64_t _lastPushedCom;
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// Revocation threshold for COM or 0 if none
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uint64_t _comRevocationThreshold;
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// Remote member's latest network COM
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CertificateOfMembership _com;
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// Revocations by credentialKey()
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Hashtable< uint64_t,uint64_t > _revocations;
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// Remote credentials that we have received from this member (and that are valid)
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Hashtable< uint32_t,Tag > _remoteTags;
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Hashtable< uint32_t,Capability > _remoteCaps;
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Hashtable< uint32_t,CertificateOfOwnership > _remoteCoos;
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// Time we last pushed our local credentials to this member
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struct {
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uint64_t tag[ZT_MAX_NETWORK_TAGS];
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uint64_t cap[ZT_MAX_NETWORK_CAPABILITIES];
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uint64_t coo[ZT_MAX_CERTIFICATES_OF_OWNERSHIP];
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} _localCredLastPushed;
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public:
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class CapabilityIterator
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{
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public:
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CapabilityIterator(Membership &m,const NetworkConfig &nconf) :
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_hti(m._remoteCaps),
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_k((uint32_t *)0),
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_c((Capability *)0),
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_m(m),
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_nconf(nconf)
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{
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}
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inline Capability *next()
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{
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while (_hti.next(_k,_c)) {
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if (_m._isCredentialTimestampValid(_nconf,*_c))
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return _c;
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}
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return (Capability *)0;
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}
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private:
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Hashtable< uint32_t,Capability >::Iterator _hti;
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uint32_t *_k;
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Capability *_c;
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Membership &_m;
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const NetworkConfig &_nconf;
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};
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};
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} // namespace ZeroTier
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#endif
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