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ZeroTierOne/service/SoftwareUpdater.cpp

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/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/
*
* 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/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "../node/Constants.hpp"
#include "../version.h"
#ifdef __WINDOWS__
#include <WinSock2.h>
#include <Windows.h>
#include <ShlObj.h>
#include <netioapi.h>
#include <iphlpapi.h>
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <unistd.h>
#include <ifaddrs.h>
#endif
#include "SoftwareUpdater.hpp"
#include "../node/Utils.hpp"
#include "../node/SHA512.hpp"
#include "../node/Buffer.hpp"
#include "../node/Node.hpp"
#include "../osdep/OSUtils.hpp"
#ifndef ZT_BUILD_ARCHITECTURE
#define ZT_BUILD_ARCHITECTURE 0
#endif
#ifndef ZT_BUILD_PLATFORM
#define ZT_BUILD_PLATFORM 0
#endif
namespace ZeroTier {
SoftwareUpdater::SoftwareUpdater(Node &node,const std::string &homePath) :
_node(node),
_lastCheckTime(0),
_homePath(homePath),
_channel(ZT_SOFTWARE_UPDATE_DEFAULT_CHANNEL),
_distLog((FILE *)0),
_latestValid(false),
_downloadLength(0)
{
// Check for a cached newer update. If there's a cached update that is not newer or looks bad, delete.
try {
std::string buf;
if (OSUtils::readFile((_homePath + ZT_PATH_SEPARATOR_S ZT_SOFTWARE_UPDATE_META_FILENAME).c_str(),buf)) {
nlohmann::json meta = OSUtils::jsonParse(buf);
buf = std::string();
const unsigned int rvMaj = (unsigned int)OSUtils::jsonInt(meta[ZT_SOFTWARE_UPDATE_JSON_VERSION_MAJOR],0);
const unsigned int rvMin = (unsigned int)OSUtils::jsonInt(meta[ZT_SOFTWARE_UPDATE_JSON_VERSION_MINOR],0);
const unsigned int rvRev = (unsigned int)OSUtils::jsonInt(meta[ZT_SOFTWARE_UPDATE_JSON_VERSION_REVISION],0);
const unsigned int rvBld = (unsigned int)OSUtils::jsonInt(meta[ZT_SOFTWARE_UPDATE_JSON_VERSION_BUILD],0);
if ((Utils::compareVersion(rvMaj,rvMin,rvRev,rvBld,ZEROTIER_ONE_VERSION_MAJOR,ZEROTIER_ONE_VERSION_MINOR,ZEROTIER_ONE_VERSION_REVISION,ZEROTIER_ONE_VERSION_BUILD) > 0)&&
(OSUtils::readFile((_homePath + ZT_PATH_SEPARATOR_S ZT_SOFTWARE_UPDATE_BIN_FILENAME).c_str(),buf))) {
if ((uint64_t)buf.length() == OSUtils::jsonInt(meta[ZT_SOFTWARE_UPDATE_JSON_UPDATE_SIZE],0)) {
_latestMeta = meta;
_latestValid = true;
//printf("CACHED UPDATE IS NEWER AND LOOKS GOOD\n");
}
}
}
} catch ( ... ) {} // exceptions indicate invalid cached update
if (!_latestValid) {
OSUtils::rm((_homePath + ZT_PATH_SEPARATOR_S ZT_SOFTWARE_UPDATE_META_FILENAME).c_str());
OSUtils::rm((_homePath + ZT_PATH_SEPARATOR_S ZT_SOFTWARE_UPDATE_BIN_FILENAME).c_str());
}
}
SoftwareUpdater::~SoftwareUpdater()
{
if (_distLog)
fclose(_distLog);
}
void SoftwareUpdater::setUpdateDistribution(bool distribute)
{
_dist.clear();
if (distribute) {
_distLog = fopen((_homePath + ZT_PATH_SEPARATOR_S "update-dist.log").c_str(),"a");
const std::string udd(_homePath + ZT_PATH_SEPARATOR_S "update-dist.d");
const std::vector<std::string> ud(OSUtils::listDirectory(udd.c_str()));
for(std::vector<std::string>::const_iterator u(ud.begin());u!=ud.end();++u) {
// Each update has a companion .json file describing it. Other files are ignored.
if ((u->length() > 5)&&(u->substr(u->length() - 5,5) == ".json")) {
std::string buf;
if (OSUtils::readFile((udd + ZT_PATH_SEPARATOR_S + *u).c_str(),buf)) {
try {
_D d;
d.meta = OSUtils::jsonParse(buf); // throws on invalid JSON
// If update meta is called e.g. foo.exe.json, then foo.exe is the update itself
const std::string binPath(udd + ZT_PATH_SEPARATOR_S + u->substr(0,u->length() - 5));
const std::string metaHash(OSUtils::jsonBinFromHex(d.meta[ZT_SOFTWARE_UPDATE_JSON_UPDATE_HASH]));
if ((metaHash.length() == ZT_SHA512_DIGEST_LEN)&&(OSUtils::readFile(binPath.c_str(),d.bin))) {
uint8_t sha512[ZT_SHA512_DIGEST_LEN];
SHA512::hash(sha512,d.bin.data(),(unsigned int)d.bin.length());
if (!memcmp(sha512,metaHash.data(),ZT_SHA512_DIGEST_LEN)) { // double check that hash in JSON is correct
d.meta[ZT_SOFTWARE_UPDATE_JSON_UPDATE_SIZE] = d.bin.length(); // override with correct value -- setting this in meta json is optional
_dist[Array<uint8_t,16>(sha512)] = d;
if (_distLog) {
fprintf(_distLog,".......... INIT: DISTRIBUTING %s (%u bytes)" ZT_EOL_S,binPath.c_str(),(unsigned int)d.bin.length());
fflush(_distLog);
}
}
}
} catch ( ... ) {} // ignore bad meta JSON, etc.
}
}
}
} else {
if (_distLog) {
fclose(_distLog);
_distLog = (FILE *)0;
}
}
}
void SoftwareUpdater::handleSoftwareUpdateUserMessage(uint64_t origin,const void *data,unsigned int len)
{
if (!len) return;
const MessageVerb v = (MessageVerb)reinterpret_cast<const uint8_t *>(data)[0];
try {
switch(v) {
case VERB_GET_LATEST:
case VERB_LATEST: {
nlohmann::json req = OSUtils::jsonParse(std::string(reinterpret_cast<const char *>(data) + 1,len - 1)); // throws on invalid JSON
if (req.is_object()) {
const unsigned int rvMaj = (unsigned int)OSUtils::jsonInt(req[ZT_SOFTWARE_UPDATE_JSON_VERSION_MAJOR],0);
const unsigned int rvMin = (unsigned int)OSUtils::jsonInt(req[ZT_SOFTWARE_UPDATE_JSON_VERSION_MINOR],0);
const unsigned int rvRev = (unsigned int)OSUtils::jsonInt(req[ZT_SOFTWARE_UPDATE_JSON_VERSION_REVISION],0);
const unsigned int rvBld = (unsigned int)OSUtils::jsonInt(req[ZT_SOFTWARE_UPDATE_JSON_VERSION_BUILD],0);
const unsigned int rvPlatform = (unsigned int)OSUtils::jsonInt(req[ZT_SOFTWARE_UPDATE_JSON_PLATFORM],0);
const unsigned int rvArch = (unsigned int)OSUtils::jsonInt(req[ZT_SOFTWARE_UPDATE_JSON_ARCHITECTURE],0);
const unsigned int rvVendor = (unsigned int)OSUtils::jsonInt(req[ZT_SOFTWARE_UPDATE_JSON_VENDOR],0);
const std::string rvChannel(OSUtils::jsonString(req[ZT_SOFTWARE_UPDATE_JSON_CHANNEL],""));
if (v == VERB_GET_LATEST) {
if (_dist.size() > 0) {
const nlohmann::json *latest = (const nlohmann::json *)0;
const std::string expectedSigner = OSUtils::jsonString(req[ZT_SOFTWARE_UPDATE_JSON_EXPECT_SIGNED_BY],"");
unsigned int bestVMaj = rvMaj;
unsigned int bestVMin = rvMin;
unsigned int bestVRev = rvRev;
unsigned int bestVBld = rvBld;
for(std::map< Array<uint8_t,16>,_D >::const_iterator d(_dist.begin());d!=_dist.end();++d) {
if ((OSUtils::jsonInt(d->second.meta[ZT_SOFTWARE_UPDATE_JSON_PLATFORM],0) == rvPlatform)&&
(OSUtils::jsonInt(d->second.meta[ZT_SOFTWARE_UPDATE_JSON_ARCHITECTURE],0) == rvArch)&&
(OSUtils::jsonInt(d->second.meta[ZT_SOFTWARE_UPDATE_JSON_VENDOR],0) == rvVendor)&&
(OSUtils::jsonString(d->second.meta[ZT_SOFTWARE_UPDATE_JSON_CHANNEL],"") == rvChannel)&&
(OSUtils::jsonString(d->second.meta[ZT_SOFTWARE_UPDATE_JSON_UPDATE_SIGNED_BY],"") == expectedSigner)) {
const unsigned int dvMaj = (unsigned int)OSUtils::jsonInt(d->second.meta[ZT_SOFTWARE_UPDATE_JSON_VERSION_MAJOR],0);
const unsigned int dvMin = (unsigned int)OSUtils::jsonInt(d->second.meta[ZT_SOFTWARE_UPDATE_JSON_VERSION_MINOR],0);
const unsigned int dvRev = (unsigned int)OSUtils::jsonInt(d->second.meta[ZT_SOFTWARE_UPDATE_JSON_VERSION_REVISION],0);
const unsigned int dvBld = (unsigned int)OSUtils::jsonInt(d->second.meta[ZT_SOFTWARE_UPDATE_JSON_VERSION_BUILD],0);
if (Utils::compareVersion(dvMaj,dvMin,dvRev,dvBld,bestVMaj,bestVMin,bestVRev,bestVBld) > 0) {
latest = &(d->second.meta);
bestVMaj = dvMaj;
bestVMin = dvMin;
bestVRev = dvRev;
bestVBld = dvBld;
}
}
}
if (latest) {
std::string lj;
lj.push_back((char)VERB_LATEST);
lj.append(OSUtils::jsonDump(*latest));
_node.sendUserMessage(origin,ZT_SOFTWARE_UPDATE_USER_MESSAGE_TYPE,lj.data(),(unsigned int)lj.length());
if (_distLog) {
fprintf(_distLog,"%.10llx GET_LATEST %u.%u.%u_%u platform %u arch %u vendor %u channel %s -> LATEST %u.%u.%u_%u" ZT_EOL_S,(unsigned long long)origin,rvMaj,rvMin,rvRev,rvBld,rvPlatform,rvArch,rvVendor,rvChannel.c_str(),bestVMaj,bestVMin,bestVRev,bestVBld);
fflush(_distLog);
}
}
} // else no reply, since we have nothing to distribute
} else { // VERB_LATEST
if ((origin == ZT_SOFTWARE_UPDATE_SERVICE)&&
(Utils::compareVersion(rvMaj,rvMin,rvRev,rvBld,ZEROTIER_ONE_VERSION_MAJOR,ZEROTIER_ONE_VERSION_MINOR,ZEROTIER_ONE_VERSION_REVISION,ZEROTIER_ONE_VERSION_BUILD) > 0)&&
(OSUtils::jsonString(req[ZT_SOFTWARE_UPDATE_JSON_UPDATE_SIGNED_BY],"") == ZT_SOFTWARE_UPDATE_SIGNING_AUTHORITY)) {
const unsigned long len = (unsigned long)OSUtils::jsonInt(req[ZT_SOFTWARE_UPDATE_JSON_UPDATE_SIZE],0);
const std::string hash = OSUtils::jsonBinFromHex(req[ZT_SOFTWARE_UPDATE_JSON_UPDATE_HASH]);
if ((len <= ZT_SOFTWARE_UPDATE_MAX_SIZE)&&(hash.length() >= 16)) {
if (_latestMeta != req) {
_latestMeta = req;
_latestValid = false;
OSUtils::rm((_homePath + ZT_PATH_SEPARATOR_S ZT_SOFTWARE_UPDATE_META_FILENAME).c_str());
OSUtils::rm((_homePath + ZT_PATH_SEPARATOR_S ZT_SOFTWARE_UPDATE_BIN_FILENAME).c_str());
_download = std::string();
memcpy(_downloadHashPrefix.data,hash.data(),16);
_downloadLength = len;
}
if ((_downloadLength > 0)&&(_download.length() < _downloadLength)) {
Buffer<128> gd;
gd.append((uint8_t)VERB_GET_DATA);
gd.append(_downloadHashPrefix.data,16);
gd.append((uint32_t)_download.length());
_node.sendUserMessage(ZT_SOFTWARE_UPDATE_SERVICE,ZT_SOFTWARE_UPDATE_USER_MESSAGE_TYPE,gd.data(),gd.size());
//printf(">> GET_DATA @%u\n",(unsigned int)_download.length());
}
}
}
}
}
} break;
case VERB_GET_DATA:
if ((len >= 21)&&(_dist.size() > 0)) {
unsigned long idx = (unsigned long)*(reinterpret_cast<const uint8_t *>(data) + 17) << 24;
idx |= (unsigned long)*(reinterpret_cast<const uint8_t *>(data) + 18) << 16;
idx |= (unsigned long)*(reinterpret_cast<const uint8_t *>(data) + 19) << 8;
idx |= (unsigned long)*(reinterpret_cast<const uint8_t *>(data) + 20);
//printf("<< GET_DATA @%u from %.10llx for %s\n",(unsigned int)idx,origin,Utils::hex(reinterpret_cast<const uint8_t *>(data) + 1,16).c_str());
std::map< Array<uint8_t,16>,_D >::iterator d(_dist.find(Array<uint8_t,16>(reinterpret_cast<const uint8_t *>(data) + 1)));
if ((d != _dist.end())&&(idx < (unsigned long)d->second.bin.length())) {
Buffer<ZT_SOFTWARE_UPDATE_CHUNK_SIZE + 128> buf;
buf.append((uint8_t)VERB_DATA);
buf.append(reinterpret_cast<const uint8_t *>(data) + 1,16);
buf.append((uint32_t)idx);
buf.append(d->second.bin.data() + idx,std::min((unsigned long)ZT_SOFTWARE_UPDATE_CHUNK_SIZE,(unsigned long)(d->second.bin.length() - idx)));
_node.sendUserMessage(origin,ZT_SOFTWARE_UPDATE_USER_MESSAGE_TYPE,buf.data(),buf.size());
//printf(">> DATA @%u\n",(unsigned int)idx);
}
}
break;
case VERB_DATA:
if ((len >= 21)&&(_downloadLength > 0)&&(!memcmp(_downloadHashPrefix.data,reinterpret_cast<const uint8_t *>(data) + 1,16))) {
unsigned long idx = (unsigned long)*(reinterpret_cast<const uint8_t *>(data) + 17) << 24;
idx |= (unsigned long)*(reinterpret_cast<const uint8_t *>(data) + 18) << 16;
idx |= (unsigned long)*(reinterpret_cast<const uint8_t *>(data) + 19) << 8;
idx |= (unsigned long)*(reinterpret_cast<const uint8_t *>(data) + 20);
//printf("<< DATA @%u / %u bytes (we now have %u bytes)\n",(unsigned int)idx,(unsigned int)(len - 21),(unsigned int)_download.length());
if (idx == (unsigned long)_download.length()) {
_download.append(reinterpret_cast<const char *>(data) + 21,len - 21);
if (_download.length() < _downloadLength) {
Buffer<128> gd;
gd.append((uint8_t)VERB_GET_DATA);
gd.append(_downloadHashPrefix.data,16);
gd.append((uint32_t)_download.length());
_node.sendUserMessage(ZT_SOFTWARE_UPDATE_SERVICE,ZT_SOFTWARE_UPDATE_USER_MESSAGE_TYPE,gd.data(),gd.size());
//printf(">> GET_DATA @%u\n",(unsigned int)_download.length());
}
}
}
break;
default:
if (_distLog) {
fprintf(_distLog,"%.10llx WARNING: bad update message verb==%u length==%u (unrecognized verb)" ZT_EOL_S,origin,(unsigned int)v,len);
fflush(_distLog);
}
break;
}
} catch ( ... ) {
if (_distLog) {
fprintf(_distLog,"%.10llx WARNING: bad update message verb==%u length==%u (unexpected exception, likely invalid JSON)" ZT_EOL_S,origin,(unsigned int)v,len);
fflush(_distLog);
}
}
}
bool SoftwareUpdater::check(const uint64_t now)
{
if ((now - _lastCheckTime) >= ZT_SOFTWARE_UPDATE_CHECK_PERIOD) {
_lastCheckTime = now;
char tmp[512];
const unsigned int len = Utils::snprintf(tmp,sizeof(tmp),
"%c{\"" ZT_SOFTWARE_UPDATE_JSON_VERSION_MAJOR "\":%d,"
"\"" ZT_SOFTWARE_UPDATE_JSON_VERSION_MINOR "\":%d,"
"\"" ZT_SOFTWARE_UPDATE_JSON_VERSION_REVISION "\":%d,"
"\"" ZT_SOFTWARE_UPDATE_JSON_VERSION_BUILD "\":%d,"
"\"" ZT_SOFTWARE_UPDATE_JSON_EXPECT_SIGNED_BY "\":\"%s\","
"\"" ZT_SOFTWARE_UPDATE_JSON_PLATFORM "\":%d,"
"\"" ZT_SOFTWARE_UPDATE_JSON_ARCHITECTURE "\":%d,"
"\"" ZT_SOFTWARE_UPDATE_JSON_VENDOR "\":%d,"
"\"" ZT_SOFTWARE_UPDATE_JSON_CHANNEL "\":\"%s\"}",
(char)VERB_GET_LATEST,
ZEROTIER_ONE_VERSION_MAJOR,
ZEROTIER_ONE_VERSION_MINOR,
ZEROTIER_ONE_VERSION_REVISION,
ZEROTIER_ONE_VERSION_BUILD,
ZT_SOFTWARE_UPDATE_SIGNING_AUTHORITY,
ZT_BUILD_PLATFORM,
ZT_BUILD_ARCHITECTURE,
(int)ZT_VENDOR_ZEROTIER,
_channel.c_str());
_node.sendUserMessage(ZT_SOFTWARE_UPDATE_SERVICE,ZT_SOFTWARE_UPDATE_USER_MESSAGE_TYPE,tmp,len);
//printf(">> GET_LATEST\n");
}
if (_latestValid)
return true;
if (_downloadLength > 0) {
if (_download.length() >= _downloadLength) {
// This is the very important security validation part that makes sure
// this software update doesn't have cooties.
const std::string metaPath(_homePath + ZT_PATH_SEPARATOR_S ZT_SOFTWARE_UPDATE_META_FILENAME);
const std::string binPath(_homePath + ZT_PATH_SEPARATOR_S ZT_SOFTWARE_UPDATE_BIN_FILENAME);
try {
// (1) Check the hash itself to make sure the image is basically okay
uint8_t sha512[ZT_SHA512_DIGEST_LEN];
SHA512::hash(sha512,_download.data(),(unsigned int)_download.length());
if (Utils::hex(sha512,ZT_SHA512_DIGEST_LEN) == OSUtils::jsonString(_latestMeta[ZT_SOFTWARE_UPDATE_JSON_UPDATE_HASH],"")) {
// (2) Check signature by signing authority
const std::string sig(OSUtils::jsonBinFromHex(_latestMeta[ZT_SOFTWARE_UPDATE_JSON_UPDATE_SIGNATURE]));
if (Identity(ZT_SOFTWARE_UPDATE_SIGNING_AUTHORITY).verify(_download.data(),(unsigned int)_download.length(),sig.data(),(unsigned int)sig.length())) {
// (3) Try to save file, and if so we are good.
if (OSUtils::writeFile(metaPath.c_str(),OSUtils::jsonDump(_latestMeta)) && OSUtils::writeFile(binPath.c_str(),_download)) {
OSUtils::lockDownFile(metaPath.c_str(),false);
OSUtils::lockDownFile(binPath.c_str(),false);
_latestValid = true;
//printf("VALID UPDATE\n%s\n",OSUtils::jsonDump(_latestMeta).c_str());
_download = std::string();
_downloadLength = 0;
return true;
}
}
}
} catch ( ... ) {} // any exception equals verification failure
// If we get here, checks failed.
//printf("INVALID UPDATE (!!!)\n%s\n",OSUtils::jsonDump(_latestMeta).c_str());
OSUtils::rm(metaPath.c_str());
OSUtils::rm(binPath.c_str());
_latestMeta = nlohmann::json();
_latestValid = false;
_download = std::string();
_downloadLength = 0;
} else {
Buffer<128> gd;
gd.append((uint8_t)VERB_GET_DATA);
gd.append(_downloadHashPrefix.data,16);
gd.append((uint32_t)_download.length());
_node.sendUserMessage(ZT_SOFTWARE_UPDATE_SERVICE,ZT_SOFTWARE_UPDATE_USER_MESSAGE_TYPE,gd.data(),gd.size());
//printf(">> GET_DATA @%u\n",(unsigned int)_download.length());
}
}
return false;
}
void SoftwareUpdater::apply()
{
std::string updatePath(_homePath + ZT_PATH_SEPARATOR_S ZT_SOFTWARE_UPDATE_BIN_FILENAME);
if ((_latestMeta.is_object())&&(_latestValid)&&(OSUtils::fileExists(updatePath.c_str(),false))) {
#ifdef __WINDOWS__
std::string cmdArgs(OSUtils::jsonString(_latestMeta[ZT_SOFTWARE_UPDATE_JSON_UPDATE_EXEC_ARGS],""));
if (cmdArgs.length() > 0) {
updatePath.push_back(' ');
updatePath.append(cmdArgs);
}
STARTUPINFOA si;
PROCESS_INFORMATION pi;
memset(&si,0,sizeof(si));
memset(&pi,0,sizeof(pi));
CreateProcessA(NULL,const_cast<LPSTR>(updatePath.c_str()),NULL,NULL,FALSE,CREATE_NO_WINDOW|CREATE_NEW_PROCESS_GROUP,NULL,NULL,&si,&pi);
// Windows doesn't exit here -- updater will stop the service during update, etc. -- but we do want to stop multiple runs from happening
_latestMeta = nlohmann::json();
_latestValid = false;
#else
char *argv[256];
unsigned long ac = 0;
argv[ac++] = const_cast<char *>(updatePath.c_str());
const std::vector<std::string> argsSplit(OSUtils::split(OSUtils::jsonString(_latestMeta[ZT_SOFTWARE_UPDATE_JSON_UPDATE_EXEC_ARGS],"").c_str()," ","\\","\""));
for(std::vector<std::string>::const_iterator a(argsSplit.begin());a!=argsSplit.end();++a) {
argv[ac] = const_cast<char *>(a->c_str());
if (++ac == 255) break;
}
argv[ac] = (char *)0;
chmod(updatePath.c_str(),0700);
// Close all open file descriptors except stdout/stderr/etc.
int minMyFd = STDIN_FILENO;
if (STDOUT_FILENO > minMyFd) minMyFd = STDOUT_FILENO;
if (STDERR_FILENO > minMyFd) minMyFd = STDERR_FILENO;
++minMyFd;
#ifdef _SC_OPEN_MAX
int maxMyFd = (int)sysconf(_SC_OPEN_MAX);
if (maxMyFd <= minMyFd)
maxMyFd = 65536;
#else
int maxMyFd = 65536;
#endif
while (minMyFd < maxMyFd)
close(minMyFd++);
execv(updatePath.c_str(),argv);
fprintf(stderr,"FATAL: unable to execute software update binary at %s\n",updatePath.c_str());
exit(1);
#endif
}
}
} // namespace ZeroTier
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