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-rw-r--r--service/SoftwareUpdater.cpp439
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diff --git a/service/SoftwareUpdater.cpp b/service/SoftwareUpdater.cpp
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+++ b/service/SoftwareUpdater.cpp
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+/*
+ * ZeroTier One - Network Virtualization Everywhere
+ * Copyright (C) 2011-2018 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/>.
+ *
+ * --
+ *
+ * You can be released from the requirements of the license by purchasing
+ * a commercial license. Buying such a license is mandatory as soon as you
+ * develop commercial closed-source software that incorporates or links
+ * directly against ZeroTier software without disclosing the source code
+ * of your own application.
+ */
+
+#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"
+
+namespace ZeroTier {
+
+static int _compareVersion(unsigned int maj1,unsigned int min1,unsigned int rev1,unsigned int b1,unsigned int maj2,unsigned int min2,unsigned int rev2,unsigned int b2)
+{
+ if (maj1 > maj2) {
+ return 1;
+ } else if (maj1 < maj2) {
+ return -1;
+ } else {
+ if (min1 > min2) {
+ return 1;
+ } else if (min1 < min2) {
+ return -1;
+ } else {
+ if (rev1 > rev2) {
+ return 1;
+ } else if (rev1 < rev2) {
+ return -1;
+ } else {
+ if (b1 > b2) {
+ return 1;
+ } else if (b1 < b2) {
+ return -1;
+ } else {
+ return 0;
+ }
+ }
+ }
+ }
+}
+
+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)
+{
+ 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))) {
+ std::array<uint8_t,ZT_SHA512_DIGEST_LEN> sha512;
+ SHA512::hash(sha512.data(),d.bin.data(),(unsigned int)d.bin.length());
+ if (!memcmp(sha512.data(),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
+ std::array<uint8_t,16> shakey;
+ memcpy(shakey.data(),sha512.data(),16);
+ _dist[shakey] = 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< std::array<uint8_t,16>,_D >::const_iterator d(_dist.begin());d!=_dist.end();++d) {
+ // The arch field in update description .json files can be an array for e.g. multi-arch update files
+ const nlohmann::json &dvArch2 = d->second.meta[ZT_SOFTWARE_UPDATE_JSON_ARCHITECTURE];
+ std::vector<unsigned int> dvArch;
+ if (dvArch2.is_array()) {
+ for(unsigned long i=0;i<dvArch2.size();++i)
+ dvArch.push_back((unsigned int)OSUtils::jsonInt(dvArch2[i],0));
+ } else {
+ dvArch.push_back((unsigned int)OSUtils::jsonInt(dvArch2,0));
+ }
+
+ if ((OSUtils::jsonInt(d->second.meta[ZT_SOFTWARE_UPDATE_JSON_PLATFORM],0) == rvPlatform)&&
+ (std::find(dvArch.begin(),dvArch.end(),rvArch) != dvArch.end())&&
+ (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 (_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((void *)0,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)&&
+ (_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_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((void *)0,ZT_SOFTWARE_UPDATE_SERVICE,ZT_SOFTWARE_UPDATE_USER_MESSAGE_TYPE,gd.data(),gd.size());
+ }
+ }
+ }
+ }
+
+ }
+ } 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);
+ std::array<uint8_t,16> shakey;
+ memcpy(shakey.data(),reinterpret_cast<const uint8_t *>(data) + 1,16);
+ std::map< std::array<uint8_t,16>,_D >::iterator d(_dist.find(shakey));
+ 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((void *)0,origin,ZT_SOFTWARE_UPDATE_USER_MESSAGE_TYPE,buf.data(),buf.size());
+ }
+ }
+ 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);
+ 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((void *)0,ZT_SOFTWARE_UPDATE_SERVICE,ZT_SOFTWARE_UPDATE_USER_MESSAGE_TYPE,gd.data(),gd.size());
+ }
+ }
+ }
+ break;
+
+ default:
+ if (_distLog) {
+ fprintf(_distLog,"%.10llx WARNING: bad update message verb==%u length==%u (unrecognized verb)" ZT_EOL_S,(unsigned long long)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,(unsigned long long)origin,(unsigned int)v,len);
+ fflush(_distLog);
+ }
+ }
+}
+
+bool SoftwareUpdater::check(const int64_t now)
+{
+ if ((now - _lastCheckTime) >= ZT_SOFTWARE_UPDATE_CHECK_PERIOD) {
+ _lastCheckTime = now;
+ char tmp[512];
+ const unsigned int len = OSUtils::ztsnprintf(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((void *)0,ZT_SOFTWARE_UPDATE_SERVICE,ZT_SOFTWARE_UPDATE_USER_MESSAGE_TYPE,tmp,len);
+ }
+
+ 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 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());
+ char hexbuf[(ZT_SHA512_DIGEST_LEN * 2) + 2];
+ if (OSUtils::jsonString(_latestMeta[ZT_SOFTWARE_UPDATE_JSON_UPDATE_HASH],"") == Utils::hex(sha512,ZT_SHA512_DIGEST_LEN,hexbuf)) {
+ // (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.
+ OSUtils::rm(binPath.c_str());
+ if (OSUtils::writeFile(binPath.c_str(),_download)) {
+ OSUtils::lockDownFile(binPath.c_str(),false);
+ _latestValid = true;
+ _download = std::string();
+ _downloadLength = 0;
+ return true;
+ }
+ }
+ }
+ } catch ( ... ) {} // any exception equals verification failure
+
+ // If we get here, checks failed.
+ 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((void *)0,ZT_SOFTWARE_UPDATE_SERVICE,ZT_SOFTWARE_UPDATE_USER_MESSAGE_TYPE,gd.data(),gd.size());
+ }
+ }
+
+ 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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