ZeroTierOne/node/NodeConfig.cpp

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/*
* ZeroTier One - Global Peer to Peer Ethernet
* Copyright (C) 2012-2013 ZeroTier Networks LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* --
*
* ZeroTier may be used and distributed under the terms of the GPLv3, which
* are available at: http://www.gnu.org/licenses/gpl-3.0.html
*
* If you would like to embed ZeroTier into a commercial application or
* redistribute it in a modified binary form, please contact ZeroTier Networks
* LLC. Start here: http://www.zerotier.com/
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <memory>
#include <string>
#include <map>
#include <set>
#include <openssl/sha.h>
#include "NodeConfig.hpp"
#include "RuntimeEnvironment.hpp"
#include "Defaults.hpp"
#include "Utils.hpp"
#include "Logger.hpp"
#include "Topology.hpp"
#include "Demarc.hpp"
#include "InetAddress.hpp"
#include "Peer.hpp"
#include "Salsa20.hpp"
#include "HMAC.hpp"
namespace ZeroTier {
NodeConfig::NodeConfig(const RuntimeEnvironment *renv,const char *authToken)
throw(std::runtime_error) :
_r(renv),
_controlSocket(true,ZT_CONTROL_UDP_PORT,false,&_CBcontrolPacketHandler,this)
{
SHA256_CTX sha;
SHA256_Init(&sha);
SHA256_Update(&sha,authToken,strlen(authToken));
SHA256_Final(_controlSocketKey,&sha);
std::map<std::string,bool> networksDotD(Utils::listDirectory((_r->homePath + ZT_PATH_SEPARATOR_S + "networks.d").c_str()));
std::set<uint64_t> nwids;
for(std::map<std::string,bool>::iterator d(networksDotD.begin());d!=networksDotD.end();++d) {
if (!d->second) {
std::string::size_type dot = d->first.rfind(".conf");
if (dot != std::string::npos) {
uint64_t nwid = strtoull(d->first.substr(0,dot).c_str(),(char **)0,16);
if (nwid > 0)
nwids.insert(nwid);
}
}
}
// TODO:
// This might go away eventually. This causes the LAN called Earth to be
// automatically joined if there are no other networks. This is for backward
// compatibility with the expectations of previous alpha users.
if (nwids.empty())
nwids.insert(0x6c92786fee000001ULL);
for(std::set<uint64_t>::iterator nwid(nwids.begin());nwid!=nwids.end();++nwid) {
try {
SharedPtr<Network> nw(Network::newInstance(_r,*nwid));
_networks[*nwid] = nw;
} catch (std::exception &exc) {
LOG("unable to create network %.16llx: %s",(unsigned long long)*nwid,exc.what());
} catch ( ... ) {
LOG("unable to create network %.16llx: (unknown exception)",(unsigned long long)*nwid);
}
}
}
NodeConfig::~NodeConfig()
{
}
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void NodeConfig::whackAllTaps()
{
std::vector< SharedPtr<Network> > nwlist;
Mutex::Lock _l(_networks_m);
for(std::map< uint64_t,SharedPtr<Network> >::const_iterator n(_networks.begin());n!=_networks.end();++n)
n->second->tap().whack();
}
void NodeConfig::clean()
{
Mutex::Lock _l(_networks_m);
for(std::map< uint64_t,SharedPtr<Network> >::const_iterator n(_networks.begin());n!=_networks.end();++n)
n->second->clean();
}
// Macro used in execute()
#undef _P
#define _P(f,...) { r.push_back(std::string()); Utils::stdsprintf(r.back(),(f),##__VA_ARGS__); }
// Used with Topology::eachPeer to dump peer stats
class _DumpPeerStatistics
{
public:
_DumpPeerStatistics(std::vector<std::string> &out) :
r(out),
_now(Utils::now())
{
}
inline void operator()(Topology &t,const SharedPtr<Peer> &p)
{
InetAddress v4(p->ipv4ActivePath(_now));
InetAddress v6(p->ipv6ActivePath(_now));
_P("200 listpeers %s %s %s %u %s",
p->address().toString().c_str(),
((v4) ? v4.toString().c_str() : "-"),
((v6) ? v6.toString().c_str() : "-"),
(((v4)||(v6)) ? p->latency() : 0),
p->remoteVersion().c_str());
}
private:
std::vector<std::string> &r;
uint64_t _now;
};
std::vector<std::string> NodeConfig::execute(const char *command)
{
std::vector<std::string> r;
std::vector<std::string> cmd(Utils::split(command,"\r\n \t","\\","'"));
//
// Not coincidentally, response type codes correspond with HTTP
// status codes.
//
if ((cmd.empty())||(cmd[0] == "help")) {
_P("200 help help");
_P("200 help listpeers");
_P("200 help listnetworks");
_P("200 help join <network ID>");
_P("200 help leave <network ID>");
} else if (cmd[0] == "listpeers") {
_P("200 listpeers <ztaddr> <ipv4> <ipv6> <latency> <version>");
_r->topology->eachPeer(_DumpPeerStatistics(r));
} else if (cmd[0] == "listnetworks") {
Mutex::Lock _l(_networks_m);
_P("200 listnetworks <nwid> <status> <type> <dev> <ips>");
for(std::map< uint64_t,SharedPtr<Network> >::const_iterator nw(_networks.begin());nw!=_networks.end();++nw) {
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std::string tmp;
std::set<InetAddress> ips(nw->second->tap().ips());
for(std::set<InetAddress>::iterator i(ips.begin());i!=ips.end();++i) {
if (tmp.length())
tmp.push_back(',');
tmp.append(i->toString());
}
// TODO: display network status, such as "permission denied to closed
// network" or "waiting".
_P("200 listnetworks %.16llx %s %s %s %s",
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(unsigned long long)nw->first,
Network::statusString(nw->second->status()),
(nw->second->isOpen() ? "open" : "private"),
nw->second->tap().deviceName().c_str(),
((tmp.length() > 0) ? tmp.c_str() : "-"));
}
} else if (cmd[0] == "join") {
if (cmd.size() > 1) {
uint64_t nwid = strtoull(cmd[1].c_str(),(char **)0,16);
if (nwid > 0) {
Mutex::Lock _l(_networks_m);
if (_networks.count(nwid)) {
_P("400 already a member of %.16llx",(unsigned long long)nwid);
} else {
try {
SharedPtr<Network> nw(Network::newInstance(_r,nwid));
_networks[nwid] = nw;
_P("200 join %.16llx OK",(unsigned long long)nwid);
} catch (std::exception &exc) {
_P("500 join %.16llx ERROR: %s",(unsigned long long)nwid,exc.what());
} catch ( ... ) {
_P("500 join %.16llx ERROR: (unknown exception)",(unsigned long long)nwid);
}
}
} else {
_P("400 join requires a network ID (>0) in hexadecimal format");
}
} else {
_P("400 join requires a network ID (>0) in hexadecimal format");
}
} else if (cmd[0] == "leave") {
if (cmd.size() > 1) {
Mutex::Lock _l(_networks_m);
uint64_t nwid = strtoull(cmd[1].c_str(),(char **)0,16);
std::map< uint64_t,SharedPtr<Network> >::iterator nw(_networks.find(nwid));
if (nw == _networks.end()) {
_P("404 leave %.16llx ERROR: not a member of that network",(unsigned long long)nwid);
} else {
nw->second->destroyOnDelete();
_networks.erase(nw);
}
} else {
_P("400 leave requires a network ID (>0) in hexadecimal format");
}
} else {
_P("404 %s No such command. Use 'help' for help.",cmd[0].c_str());
}
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r.push_back(std::string()); // terminate with empty line
return r;
}
std::vector< Buffer<ZT_NODECONFIG_MAX_PACKET_SIZE> > NodeConfig::encodeControlMessage(const void *key,unsigned long conversationId,const std::vector<std::string> &payload)
throw(std::out_of_range)
{
char hmac[32];
char keytmp[32];
std::vector< Buffer<ZT_NODECONFIG_MAX_PACKET_SIZE> > packets;
Buffer<ZT_NODECONFIG_MAX_PACKET_SIZE> packet;
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packet.setSize(16); // room for HMAC and IV
packet.append((uint32_t)(conversationId & 0xffffffff));
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for(unsigned int i=0;i<payload.size();++i) {
packet.append(payload[i]); // will throw if too big
packet.append((unsigned char)0);
if (((i + 1) >= payload.size())||((packet.size() + payload[i + 1].length() + 1) >= packet.capacity())) {
Utils::getSecureRandom(packet.field(8,8),8);
Salsa20 s20(key,256,packet.field(8,8));
s20.encrypt(packet.field(16,packet.size() - 16),packet.field(16,packet.size() - 16),packet.size() - 16);
memcpy(keytmp,key,32);
for(unsigned int i=0;i<32;++i)
keytmp[i] ^= 0x77; // use a different permutation of key for HMAC than for Salsa20
HMAC::sha256(keytmp,32,packet.field(16,packet.size() - 16),packet.size() - 16,hmac);
memcpy(packet.field(0,8),hmac,8);
packets.push_back(packet);
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packet.setSize(16); // room for HMAC and IV
packet.append((uint32_t)(conversationId & 0xffffffff));
}
}
return packets;
}
bool NodeConfig::decodeControlMessagePacket(const void *key,const void *data,unsigned int len,unsigned long &conversationId,std::vector<std::string> &payload)
{
char hmac[32];
char keytmp[32];
try {
if (len < 20)
return false;
Buffer<ZT_NODECONFIG_MAX_PACKET_SIZE> packet(data,len);
memcpy(keytmp,key,32);
for(unsigned int i=0;i<32;++i)
keytmp[i] ^= 0x77; // use a different permutation of key for HMAC than for Salsa20
HMAC::sha256(keytmp,32,packet.field(16,packet.size() - 16),packet.size() - 16,hmac);
if (memcmp(packet.field(0,8),hmac,8))
return false;
Salsa20 s20(key,256,packet.field(8,8));
s20.decrypt(packet.field(16,packet.size() - 16),packet.field(16,packet.size() - 16),packet.size() - 16);
conversationId = packet.at<uint32_t>(16);
const char *pl = ((const char *)packet.data()) + 20;
unsigned int pll = packet.size() - 20;
for(unsigned int i=0;i<pll;) {
unsigned int eos = i;
while ((eos < pll)&&(pl[eos]))
++eos;
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if (eos >= i) {
payload.push_back(std::string(pl + i,eos - i));
i = eos + 1;
} else break;
}
return true;
} catch ( ... ) {
return false;
}
}
void NodeConfig::_CBcontrolPacketHandler(UdpSocket *sock,void *arg,const InetAddress &remoteAddr,const void *data,unsigned int len)
{
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NodeConfig *nc = (NodeConfig *)arg;
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const RuntimeEnvironment *_r = nc->_r;
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try {
unsigned long convId = 0;
std::vector<std::string> commands;
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if (!decodeControlMessagePacket(nc->_controlSocketKey,data,len,convId,commands)) {
TRACE("control bus packet from %s failed decode, discarded",remoteAddr.toString().c_str());
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return;
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}
TRACE("control bus packet from %s, contains %d commands",remoteAddr.toString().c_str(),(int)commands.size());
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for(std::vector<std::string>::iterator c(commands.begin());c!=commands.end();++c) {
std::vector< Buffer<ZT_NODECONFIG_MAX_PACKET_SIZE> > resultPackets(encodeControlMessage(nc->_controlSocketKey,convId,nc->execute(c->c_str())));
for(std::vector< Buffer<ZT_NODECONFIG_MAX_PACKET_SIZE> >::iterator p(resultPackets.begin());p!=resultPackets.end();++p)
sock->send(remoteAddr,p->data(),p->size(),-1);
}
} catch (std::exception &exc) {
TRACE("exception handling control bus packet from %s: %s",remoteAddr.toString().c_str(),exc.what());
} catch ( ... ) {
TRACE("exception handling control bus packet from %s: (unknown)",remoteAddr.toString().c_str());
}
}
} // namespace ZeroTier