mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-27 16:28:52 +00:00
329 lines
11 KiB
C++
329 lines
11 KiB
C++
/*
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* ZeroTier One - Global Peer to Peer Ethernet
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* Copyright (C) 2012-2013 ZeroTier Networks LLC
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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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* --
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*
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* ZeroTier may be used and distributed under the terms of the GPLv3, which
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* are available at: http://www.gnu.org/licenses/gpl-3.0.html
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*
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* If you would like to embed ZeroTier into a commercial application or
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* redistribute it in a modified binary form, please contact ZeroTier Networks
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* LLC. Start here: http://www.zerotier.com/
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <math.h>
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#include <openssl/sha.h>
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#include "RuntimeEnvironment.hpp"
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#include "NodeConfig.hpp"
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#include "Network.hpp"
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#include "Switch.hpp"
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#include "Packet.hpp"
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#include "Utils.hpp"
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namespace ZeroTier {
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void Network::Certificate::_shaForSignature(unsigned char *dig) const
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{
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SHA256_CTX sha;
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SHA256_Init(&sha);
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unsigned char zero = 0;
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for(const_iterator i(begin());i!=end();++i) {
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SHA256_Update(&sha,&zero,1);
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SHA256_Update(&sha,(const unsigned char *)i->first.data(),i->first.length());
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SHA256_Update(&sha,&zero,1);
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SHA256_Update(&sha,(const unsigned char *)i->second.data(),i->second.length());
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SHA256_Update(&sha,&zero,1);
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}
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SHA256_Final(dig,&sha);
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}
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static const std::string _DELTA_PREFIX("~");
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bool Network::Certificate::qualifyMembership(const Network::Certificate &mc) const
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{
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// Note: optimization probably needed here, probably via some kind of
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// memoization / dynamic programming. But make it work first, then make
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// it fast.
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for(const_iterator myField(begin());myField!=end();++myField) {
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if (!((myField->first.length() > 1)&&(myField->first[0] == '~'))) { // ~fields are max delta range specs
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// If they lack the same field, comparison fails.
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const_iterator theirField(mc.find(myField->first));
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if (theirField == mc.end())
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return false;
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const_iterator deltaField(find(_DELTA_PREFIX + myField->first));
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if (deltaField == end()) {
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// If there is no delta, compare on simple equality
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if (myField->second != theirField->second)
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return false;
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} else {
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// Otherwise compare range with max delta. Presence of a dot in delta
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// indicates a floating point comparison. Otherwise an integer
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// comparison occurs.
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if (deltaField->second.find('.') != std::string::npos) {
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double my = strtod(myField->second.c_str(),(char **)0);
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double their = strtod(theirField->second.c_str(),(char **)0);
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double delta = strtod(deltaField->second.c_str(),(char **)0);
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if (fabs(my - their) > delta)
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return false;
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} else {
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#ifdef __WINDOWS__
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int64_t my = _strtoi64(myField->second.c_str(),(char **)0,10);
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int64_t their = _strtoi64(theirField->second.c_str(),(char **)0,10);
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int64_t delta = _strtoi64(deltaField->second.c_str(),(char **)0,10);
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#else
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int64_t my = strtoll(myField->second.c_str(),(char **)0,10);
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int64_t their = strtoll(theirField->second.c_str(),(char **)0,10);
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int64_t delta = strtoll(deltaField->second.c_str(),(char **)0,10);
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#endif
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if (my > their) {
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if ((my - their) > delta)
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return false;
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} else {
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if ((their - my) > delta)
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return false;
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}
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}
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}
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}
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}
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return true;
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}
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// A low default global rate, fast enough for something like ARP
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const Network::MulticastRates::Rate Network::MulticastRates::GLOBAL_DEFAULT_RATE(256.0,-32.0,256.0,64.0);
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const char *Network::statusString(const Status s)
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throw()
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{
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switch(s) {
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case NETWORK_WAITING_FOR_FIRST_AUTOCONF: return "WAITING_FOR_FIRST_AUTOCONF";
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case NETWORK_OK: return "OK";
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case NETWORK_ACCESS_DENIED: return "ACCESS_DENIED";
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}
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return "(invalid)";
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}
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Network::~Network()
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{
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delete _tap;
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if (_destroyOnDelete) {
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std::string confPath(_r->homePath + ZT_PATH_SEPARATOR_S + "networks.d" + ZT_PATH_SEPARATOR_S + toString() + ".conf");
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std::string mcdbPath(_r->homePath + ZT_PATH_SEPARATOR_S + "networks.d" + ZT_PATH_SEPARATOR_S + toString() + ".mcerts");
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Utils::rm(confPath);
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Utils::rm(mcdbPath);
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} else {
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// Causes flush of membership certs to disk
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clean();
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}
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}
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SharedPtr<Network> Network::newInstance(const RuntimeEnvironment *renv,uint64_t id)
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throw(std::runtime_error)
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{
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char tag[32];
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Utils::snprintf(tag,sizeof(tag),"%.16llx",(unsigned long long)id);
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// We construct Network via a static method to ensure that it is immediately
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// wrapped in a SharedPtr<>. Otherwise if there is traffic on the Ethernet
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// tap device, a SharedPtr<> wrap can occur in the Ethernet frame handler
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// that then causes the Network instance to be deleted before it is finished
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// being constructed. C++ edge cases, how I love thee.
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SharedPtr<Network> nw(new Network());
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nw->_ready = false; // disable handling of Ethernet frames during construct
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nw->_r = renv;
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nw->_tap = new EthernetTap(renv,tag,renv->identity.address().toMAC(),ZT_IF_MTU,&_CBhandleTapData,nw.ptr());
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memset(nw->_etWhitelist,0,sizeof(nw->_etWhitelist));
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nw->_id = id;
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nw->_lastConfigUpdate = 0;
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nw->_destroyOnDelete = false;
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if (nw->controller() == renv->identity.address()) // sanity check, this isn't supported for now
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throw std::runtime_error("cannot add a network for which I am the netconf master");
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nw->_restoreState();
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nw->_ready = true; // enable handling of Ethernet frames
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nw->requestConfiguration();
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return nw;
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}
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void Network::setConfiguration(const Network::Config &conf)
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{
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Mutex::Lock _l(_lock);
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try {
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if (conf.networkId() == _id) { // sanity check
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//TRACE("network %.16llx got netconf:\n%s",(unsigned long long)_id,conf.toString().c_str());
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_configuration = conf;
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_myCertificate = conf.certificateOfMembership();
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_lastConfigUpdate = Utils::now();
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_tap->setIps(conf.staticAddresses());
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_tap->setDisplayName((std::string("ZeroTier One [") + conf.name() + "]").c_str());
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memset(_etWhitelist,0,sizeof(_etWhitelist));
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std::set<unsigned int> wl(conf.etherTypes());
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for(std::set<unsigned int>::const_iterator t(wl.begin());t!=wl.end();++t)
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_etWhitelist[*t / 8] |= (unsigned char)(1 << (*t % 8));
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std::string confPath(_r->homePath + ZT_PATH_SEPARATOR_S + "networks.d" + ZT_PATH_SEPARATOR_S + toString() + ".conf");
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if (!Utils::writeFile(confPath.c_str(),conf.toString())) {
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LOG("error: unable to write network configuration file at: %s",confPath.c_str());
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}
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}
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} catch ( ... ) {
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_configuration = Config();
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_myCertificate = Certificate();
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_lastConfigUpdate = 0;
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LOG("unexpected exception handling config for network %.16llx, retrying fetch...",(unsigned long long)_id);
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}
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}
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void Network::requestConfiguration()
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{
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if (controller() == _r->identity.address()) {
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LOG("unable to request network configuration for network %.16llx: I am the network master, cannot query self",(unsigned long long)_id);
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return;
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}
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TRACE("requesting netconf for network %.16llx from netconf master %s",(unsigned long long)_id,controller().toString().c_str());
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Packet outp(controller(),_r->identity.address(),Packet::VERB_NETWORK_CONFIG_REQUEST);
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outp.append((uint64_t)_id);
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outp.append((uint16_t)0); // no meta-data
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_r->sw->send(outp,true);
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}
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void Network::addMembershipCertificate(const Address &peer,const Certificate &cert)
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{
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Mutex::Lock _l(_lock);
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if (!_configuration.isOpen())
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_membershipCertificates[peer] = cert;
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}
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bool Network::isAllowed(const Address &peer) const
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{
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// Exceptions can occur if we do not yet have *our* configuration.
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try {
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Mutex::Lock _l(_lock);
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if (_configuration.isOpen())
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return true;
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std::map<Address,Certificate>::const_iterator pc(_membershipCertificates.find(peer));
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if (pc == _membershipCertificates.end())
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return false;
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return _myCertificate.qualifyMembership(pc->second);
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} catch (std::exception &exc) {
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TRACE("isAllowed() check failed for peer %s: unexpected exception: %s",peer.toString().c_str(),exc.what());
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} catch ( ... ) {
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TRACE("isAllowed() check failed for peer %s: unexpected exception: unknown exception",peer.toString().c_str());
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}
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return false;
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}
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void Network::clean()
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{
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std::string mcdbPath(_r->homePath + ZT_PATH_SEPARATOR_S + "networks.d" + ZT_PATH_SEPARATOR_S + toString() + ".mcerts");
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Mutex::Lock _l(_lock);
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if (_configuration.isOpen()) {
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_membershipCertificates.clear();
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Utils::rm(mcdbPath);
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} else {
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FILE *mcdb = fopen(mcdbPath.c_str(),"wb");
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bool writeError = false;
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if (!mcdb) {
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LOG("error: unable to open membership cert database at: %s",mcdbPath.c_str());
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} else {
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if ((writeError)||(fwrite("MCDB0",5,1,mcdb) != 1)) // version
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writeError = true;
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}
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for(std::map<Address,Certificate>::iterator i=(_membershipCertificates.begin());i!=_membershipCertificates.end();) {
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if (_myCertificate.qualifyMembership(i->second)) {
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if ((!writeError)&&(mcdb)) {
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char tmp[ZT_ADDRESS_LENGTH];
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i->first.copyTo(tmp,ZT_ADDRESS_LENGTH);
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if ((writeError)||(fwrite(tmp,ZT_ADDRESS_LENGTH,1,mcdb) != 1))
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writeError = true;
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std::string c(i->second.toString());
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uint32_t cl = Utils::hton((uint32_t)c.length());
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if ((writeError)||(fwrite(&cl,sizeof(cl),1,mcdb) != 1))
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writeError = true;
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if ((writeError)||(fwrite(c.data(),c.length(),1,mcdb) != 1))
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writeError = true;
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}
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++i;
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} else _membershipCertificates.erase(i++);
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}
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if (mcdb)
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fclose(mcdb);
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if (writeError) {
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Utils::rm(mcdbPath);
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LOG("error: unable to write to membership cert database at: %s",mcdbPath.c_str());
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}
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}
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}
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Network::Status Network::status() const
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{
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Mutex::Lock _l(_lock);
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if (_configuration)
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return NETWORK_OK;
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return NETWORK_WAITING_FOR_FIRST_AUTOCONF;
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}
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void Network::_CBhandleTapData(void *arg,const MAC &from,const MAC &to,unsigned int etherType,const Buffer<4096> &data)
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{
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if (!((Network *)arg)->_ready)
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return;
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const RuntimeEnvironment *_r = ((Network *)arg)->_r;
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if (_r->shutdownInProgress)
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return;
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try {
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_r->sw->onLocalEthernet(SharedPtr<Network>((Network *)arg),from,to,etherType,data);
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} catch (std::exception &exc) {
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TRACE("unexpected exception handling local packet: %s",exc.what());
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} catch ( ... ) {
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TRACE("unexpected exception handling local packet");
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}
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}
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void Network::_restoreState()
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{
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std::string confPath(_r->homePath + ZT_PATH_SEPARATOR_S + "networks.d" + ZT_PATH_SEPARATOR_S + toString() + ".conf");
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std::string confs;
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if (Utils::readFile(confPath.c_str(),confs)) {
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try {
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if (confs.length())
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setConfiguration(Config(confs));
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} catch ( ... ) {} // ignore invalid config on disk, we will re-request
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} else {
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// If the conf file isn't present, "touch" it so we'll remember
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// the existence of this network.
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FILE *tmp = fopen(confPath.c_str(),"w");
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if (tmp)
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fclose(tmp);
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}
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// TODO: restore membership certs
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}
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} // namespace ZeroTier
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