mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2025-04-16 20:16:54 +02:00
206 lines
6 KiB
C++
206 lines
6 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 <stdint.h>
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#include <memory>
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#include <string>
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#include <openssl/sha.h>
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#include "NodeConfig.hpp"
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#include "RuntimeEnvironment.hpp"
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#include "Defaults.hpp"
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#include "Utils.hpp"
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#include "Logger.hpp"
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#include "Topology.hpp"
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#include "Demarc.hpp"
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#include "InetAddress.hpp"
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#include "Peer.hpp"
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#include "Salsa20.hpp"
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#include "HMAC.hpp"
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namespace ZeroTier {
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NodeConfig::NodeConfig(const RuntimeEnvironment *renv,const char *authToken)
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throw(std::runtime_error) :
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_r(renv),
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_authToken(authToken),
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_controlSocket(true,ZT_CONTROL_UDP_PORT,false,&_CBcontrolPacketHandler,this)
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{
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SHA256_CTX sha;
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SHA256_Init(&sha);
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SHA256_Update(&sha,_authToken.data(),_authToken.length());
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SHA256_Final(_keys,&sha); // first 32 bytes of keys[]: Salsa20 key
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SHA256_Init(&sha);
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SHA256_Update(&sha,_keys,32);
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SHA256_Update(&sha,_authToken.data(),_authToken.length());
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SHA256_Final(_keys + 32,&sha); // second 32 bytes of keys[]: HMAC key
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}
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NodeConfig::~NodeConfig()
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{
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}
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void NodeConfig::whackAllTaps()
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{
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std::vector< SharedPtr<Network> > nwlist;
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Mutex::Lock _l(_networks_m);
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for(std::map< uint64_t,SharedPtr<Network> >::const_iterator n(_networks.begin());n!=_networks.end();++n)
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n->second->tap().whack();
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}
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// Macro used in execute()
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#undef _P
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#define _P(f,...) { r.push_back(std::string()); Utils::stdsprintf(r.back(),(f),##__VA_ARGS__); }
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// Used with Topology::eachPeer to dump peer stats
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class _DumpPeerStatistics
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{
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public:
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_DumpPeerStatistics(std::vector<std::string> &out) :
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r(out),
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_now(Utils::now())
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{
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}
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inline void operator()(Topology &t,const SharedPtr<Peer> &p)
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{
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InetAddress v4(p->ipv4ActivePath(_now));
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InetAddress v6(p->ipv6ActivePath(_now));
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_P("200 listpeers %s %s %s %u",
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p->address().toString().c_str(),
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((v4) ? v4.toString().c_str() : "(none)"),
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((v6) ? v6.toString().c_str() : "(none)"),
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(((v4)||(v6)) ? p->latency() : 0));
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}
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private:
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std::vector<std::string> &r;
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uint64_t _now;
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};
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std::vector<std::string> NodeConfig::execute(const char *command)
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{
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std::vector<std::string> r;
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std::vector<std::string> cmd(Utils::split(command,"\r\n \t","\\","'"));
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//
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// Not coincidentally, response type codes correspond with HTTP
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// status codes.
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//
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if ((cmd.empty())||(cmd[0] == "help")) {
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_P("200 help help");
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_P("200 help listpeers");
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_P("200 help listnetworks");
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_P("200 help join <network ID> [<network invitation code>]");
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_P("200 help leave <network ID>");
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} else if (cmd[0] == "listpeers") {
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_r->topology->eachPeer(_DumpPeerStatistics(r));
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} else if (cmd[0] == "listnetworks") {
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Mutex::Lock _l(_networks_m);
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for(std::map< uint64_t,SharedPtr<Network> >::const_iterator nw(_networks.begin());nw!=_networks.end();++nw) {
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_P("200 listnetworks %llu %s %s",
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nw->first,
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nw->second->tap().deviceName().c_str(),
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(nw->second->open() ? "public" : "private"));
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}
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} else if (cmd[0] == "join") {
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_P("404 join Not implemented yet.");
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} else if (cmd[0] == "leave") {
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_P("404 leave Not implemented yet.");
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} else {
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_P("404 %s No such command. Use 'help' for help.",cmd[0].c_str());
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}
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return r;
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}
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void NodeConfig::_CBcontrolPacketHandler(UdpSocket *sock,void *arg,const InetAddress &remoteAddr,const void *data,unsigned int len)
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{
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char hmacKey[32];
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char hmac[32];
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char buf[131072];
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NodeConfig *nc = (NodeConfig *)arg;
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const RuntimeEnvironment *_r = nc->_r;
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try {
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// Minimum length
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if (len < 24)
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return;
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if (len >= sizeof(buf)) // only up to len - 24 bytes are used on receive/decrypt
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return;
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// Compare first 16 bytes of HMAC, which is after IV in packet
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memcpy(hmacKey,nc->_keys + 32,32);
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*((uint64_t *)hmacKey) ^= *((const uint64_t *)data); // include IV in HMAC
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HMAC::sha256(hmacKey,32,((const unsigned char *)data) + 24,len - 24,hmac);
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if (memcmp(hmac,((const unsigned char *)data) + 8,16))
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return;
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// Decrypt payload if we passed HMAC
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Salsa20 s20(nc->_keys,256,data); // first 64 bits of data are IV
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s20.decrypt(((const unsigned char *)data) + 24,buf,len - 24);
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// Null-terminate string for execute()
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buf[len - 24] = (char)0;
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// Execute command
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std::vector<std::string> r(nc->execute(buf));
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// Result packet contains a series of null-terminated results
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unsigned int resultLen = 24;
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for(std::vector<std::string>::iterator i(r.begin());i!=r.end();++i) {
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if ((resultLen + i->length() + 1) >= sizeof(buf))
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return; // result too long
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memcpy(buf + resultLen,i->c_str(),i->length() + 1);
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resultLen += i->length() + 1;
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}
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// Generate result packet IV
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Utils::getSecureRandom(buf,8);
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// Generate result packet HMAC
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memcpy(hmacKey,nc->_keys + 32,32);
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*((uint64_t *)hmacKey) ^= *((const uint64_t *)buf); // include IV in HMAC
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HMAC::sha256(hmacKey,32,((const unsigned char *)buf) + 24,resultLen - 24,hmac);
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memcpy(buf + 8,hmac,16);
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// Send encrypted result back to requester
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sock->send(remoteAddr,buf,resultLen,-1);
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} catch ( ... ) {
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TRACE("unexpected exception parsing control packet or generating response");
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}
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}
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} // namespace ZeroTier
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