2013-07-04 20:56:19 +00:00
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/*
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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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2013-07-17 18:10:44 +00:00
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#include <stdlib.h>
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#include <stdint.h>
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2013-07-04 20:56:19 +00:00
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#include <memory>
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#include <string>
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2013-07-17 18:10:44 +00:00
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#include <openssl/sha.h>
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2013-07-04 20:56:19 +00:00
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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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2013-07-17 18:10:44 +00:00
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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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2013-07-04 20:56:19 +00:00
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namespace ZeroTier {
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2013-07-17 18:10:44 +00:00
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NodeConfig::NodeConfig(const RuntimeEnvironment *renv,const char *authToken)
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throw(std::runtime_error) :
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2013-07-04 20:56:19 +00:00
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_r(renv),
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2013-07-17 18:10:44 +00:00
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_controlSocket(true,ZT_CONTROL_UDP_PORT,false,&_CBcontrolPacketHandler,this)
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2013-07-04 20:56:19 +00:00
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{
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2013-07-17 18:10:44 +00:00
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SHA256_CTX sha;
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SHA256_Init(&sha);
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2013-07-18 15:43:46 +00:00
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SHA256_Update(&sha,authToken,strlen(authToken));
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SHA256_Final(_controlSocketKey,&sha);
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2013-07-04 20:56:19 +00:00
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}
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NodeConfig::~NodeConfig()
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{
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}
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2013-07-17 14:01:46 +00:00
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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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2013-07-30 15:14:53 +00:00
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void NodeConfig::cleanAllNetworks()
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{
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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->clean();
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}
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2013-07-17 18:10:44 +00:00
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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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2013-07-04 20:56:19 +00:00
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{
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2013-07-17 18:10:44 +00:00
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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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2013-07-04 20:56:19 +00:00
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2013-07-17 18:10:44 +00:00
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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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2013-07-04 20:56:19 +00:00
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2013-07-17 18:10:44 +00:00
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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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2013-07-29 17:56:20 +00:00
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(nw->second->isOpen() ? "public" : "private"));
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2013-07-17 18:10:44 +00:00
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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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2013-07-04 20:56:19 +00:00
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2013-07-17 18:10:44 +00:00
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return r;
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2013-07-04 20:56:19 +00:00
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}
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2013-07-18 15:43:46 +00:00
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std::vector< Buffer<ZT_NODECONFIG_MAX_PACKET_SIZE> > NodeConfig::encodeControlMessage(const void *key,unsigned long conversationId,const std::vector<std::string> &payload)
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throw(std::out_of_range)
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2013-07-04 20:56:19 +00:00
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{
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2013-07-17 18:10:44 +00:00
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char hmac[32];
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2013-07-18 15:43:46 +00:00
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char keytmp[32];
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std::vector< Buffer<ZT_NODECONFIG_MAX_PACKET_SIZE> > packets;
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Buffer<ZT_NODECONFIG_MAX_PACKET_SIZE> packet;
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2013-07-04 20:56:19 +00:00
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2013-07-18 15:43:46 +00:00
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packet.setSize(16); // HMAC and IV
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packet.append((uint32_t)(conversationId & 0xffffffff));
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for(unsigned int i=0;i<payload.size();++i) {
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packet.append(payload[i]); // will throw if too big
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packet.append((unsigned char)0);
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if (((i + 1) >= payload.size())||((packet.size() + payload[i + 1].length() + 1) >= packet.capacity())) {
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Utils::getSecureRandom(packet.field(8,8),8);
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2013-07-18 17:27:46 +00:00
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Salsa20 s20(key,256,packet.field(8,8));
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s20.encrypt(packet.field(16,packet.size() - 16),packet.field(16,packet.size() - 16),packet.size() - 16);
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2013-07-18 15:43:46 +00:00
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memcpy(keytmp,key,32);
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for(unsigned int i=0;i<32;++i)
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keytmp[i] ^= 0x77; // use a different permutation of key for HMAC than for Salsa20
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HMAC::sha256(keytmp,32,packet.field(16,packet.size() - 16),packet.size() - 16,hmac);
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memcpy(packet.field(0,8),hmac,8);
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packets.push_back(packet);
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packet.setSize(16); // HMAC and IV
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packet.append((uint32_t)(conversationId & 0xffffffff));
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2013-07-04 20:56:19 +00:00
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}
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2013-07-18 15:43:46 +00:00
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}
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2013-07-04 20:56:19 +00:00
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2013-07-18 15:43:46 +00:00
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return packets;
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}
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2013-07-04 20:56:19 +00:00
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2013-07-18 15:43:46 +00:00
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bool NodeConfig::decodeControlMessagePacket(const void *key,const void *data,unsigned int len,unsigned long &conversationId,std::vector<std::string> &payload)
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{
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char hmac[32];
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char keytmp[32];
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2013-07-04 20:56:19 +00:00
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2013-07-18 15:43:46 +00:00
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try {
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if (len < 20)
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return false;
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Buffer<ZT_NODECONFIG_MAX_PACKET_SIZE> packet(data,len);
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memcpy(keytmp,key,32);
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for(unsigned int i=0;i<32;++i)
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keytmp[i] ^= 0x77; // use a different permutation of key for HMAC than for Salsa20
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HMAC::sha256(keytmp,32,packet.field(16,packet.size() - 16),packet.size() - 16,hmac);
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if (memcmp(packet.field(0,8),hmac,8))
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return false;
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Salsa20 s20(key,256,packet.field(8,8));
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s20.decrypt(packet.field(16,packet.size() - 16),packet.field(16,packet.size() - 16),packet.size() - 16);
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conversationId = packet.at<uint32_t>(16);
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const char *pl = ((const char *)packet.data()) + 20;
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unsigned int pll = packet.size() - 20;
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for(unsigned int i=0;i<pll;) {
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unsigned int eos = i;
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while ((eos < pll)&&(pl[eos]))
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++eos;
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if (eos > i) {
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payload.push_back(std::string(pl + i,eos - i));
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i = eos + 1;
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} else break;
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}
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2013-07-17 21:35:19 +00:00
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2013-07-18 15:43:46 +00:00
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return true;
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2013-07-17 18:10:44 +00:00
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} catch ( ... ) {
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2013-07-18 15:43:46 +00:00
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return false;
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2013-07-17 18:10:44 +00:00
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}
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2013-07-04 20:56:19 +00:00
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}
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2013-07-18 15:43:46 +00:00
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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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2013-07-18 20:35:52 +00:00
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NodeConfig *nc = (NodeConfig *)arg;
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2013-07-20 22:24:56 +00:00
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const RuntimeEnvironment *_r = nc->_r;
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2013-07-18 20:35:52 +00:00
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try {
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unsigned long convId = 0;
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std::vector<std::string> commands;
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2013-07-20 22:24:56 +00:00
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if (!decodeControlMessagePacket(nc->_controlSocketKey,data,len,convId,commands)) {
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TRACE("control bus packet from %s failed decode, discarded",remoteAddr.toString().c_str());
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2013-07-18 20:35:52 +00:00
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return;
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2013-07-20 22:24:56 +00:00
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}
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TRACE("control bus packet from %s, contains %d commands",remoteAddr.toString().c_str(),(int)commands.size());
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2013-07-18 20:35:52 +00:00
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for(std::vector<std::string>::iterator c(commands.begin());c!=commands.end();++c) {
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std::vector< Buffer<ZT_NODECONFIG_MAX_PACKET_SIZE> > resultPackets(encodeControlMessage(nc->_controlSocketKey,convId,nc->execute(c->c_str())));
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for(std::vector< Buffer<ZT_NODECONFIG_MAX_PACKET_SIZE> >::iterator p(resultPackets.begin());p!=resultPackets.end();++p)
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sock->send(remoteAddr,p->data(),p->size(),-1);
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}
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2013-08-05 20:06:16 +00:00
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} catch (std::exception &exc) {
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TRACE("exception handling control bus packet from %s: %s",remoteAddr.toString().c_str(),exc.what());
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2013-07-24 00:21:34 +00:00
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} catch ( ... ) {
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2013-08-05 20:06:16 +00:00
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TRACE("exception handling control bus packet from %s: (unknown)",remoteAddr.toString().c_str());
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2013-07-24 00:21:34 +00:00
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}
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2013-07-18 15:43:46 +00:00
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}
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2013-07-04 20:56:19 +00:00
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} // namespace ZeroTier
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