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devilutionX-ZeroTierOne/service/SoftwareUpdater.cpp

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*
* (c) ZeroTier, Inc.
* https://www.zerotier.com/
*/
#include "../node/Constants.hpp"
#include "../version.h"
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef __WINDOWS__
#include <iphlpapi.h>
#include <netioapi.h>
#include <shlobj.h>
#include <windows.h>
#include <winsock2.h>
#else
#include <ifaddrs.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#endif
#include "../node/Buffer.hpp"
#include "../node/Node.hpp"
#include "../node/SHA512.hpp"
#include "../node/Utils.hpp"
#include "../osdep/OSUtils.hpp"
#include "SoftwareUpdater.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() == 64) && (OSUtils::readFile(binPath.c_str(), d.bin))) {
std::array<uint8_t, 64> sha512;
SHA512(sha512.data(), d.bin.data(), (unsigned int)d.bin.length());
if (! memcmp(sha512.data(), metaHash.data(), 64)) { // 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.empty()) {
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.empty())) {
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[64];
SHA512(sha512, _download.data(), (unsigned int)_download.length());
char hexbuf[(64 * 2) + 2];
if (OSUtils::jsonString(_latestMeta[ZT_SOFTWARE_UPDATE_JSON_UPDATE_HASH], "") == Utils::hex(sha512, 64, 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