Putting the main binary back together...

1 files changed, 328 insertions, 0 deletions

diff --git a/updater/SoftwareUpdater.cpp b/updater/SoftwareUpdater.cpp
new file mode 100644
index 00000000..e3789bcb
--- /dev/null
+++ b/updater/SoftwareUpdater.cpp
@@ -0,0 +1,328 @@
+/*
+ * ZeroTier One - Network Virtualization Everywhere
+ * Copyright (C) 2011-2015  ZeroTier, Inc.
+ *
+ * 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 <stdlib.h>
+#include <string.h>
+
+#include <stdexcept>
+
+#include "../version.h"
+
+#include "Constants.hpp"
+#include "SoftwareUpdater.hpp"
+#include "Dictionary.hpp"
+#include "C25519.hpp"
+#include "Identity.hpp"
+#include "Logger.hpp"
+#include "RuntimeEnvironment.hpp"
+#include "Thread.hpp"
+#include "Node.hpp"
+#include "Utils.hpp"
+#include "HttpClient.hpp"
+
+#ifdef __UNIX_LIKE__
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#endif
+
+namespace ZeroTier {
+
+static inline std::map< Address,Identity > _mkUpdateAuth()
+{
+	std::map< Address,Identity > ua;
+
+	{ // 0001
+		Identity id("e9bc3707b5:0:c4cef17bde99eadf9748c4fd11b9b06dc5cd8eb429227811d2c336e6b96a8d329e8abd0a4f45e47fe1bcebf878c004c822d952ff77fc2833af4c74e65985c435");
+		ua[id.address()] = id;
+	}
+	{ // 0002
+		Identity id("56520eaf93:0:7d858b47988b34399a9a31136de07b46104d7edb4a98fa1d6da3e583d3a33e48be531532b886f0b12cd16794a66ab9220749ec5112cbe96296b18fe0cc79ca05");
+		ua[id.address()] = id;
+	}
+	{ // 0003
+		Identity id("7c195de2e0:0:9f659071c960f9b0f0b96f9f9ecdaa27c7295feed9c79b7db6eedcc11feb705e6dd85c70fa21655204d24c897865b99eb946b753a2bbcf2be5f5e006ae618c54");
+		ua[id.address()] = id;
+	}
+	{ // 0004
+		Identity id("415f4cfde7:0:54118e87777b0ea5d922c10b337c4f4bd1db7141845bd54004b3255551a6e356ba6b9e1e85357dbfafc45630b8faa2ebf992f31479e9005f0472685f2d8cbd6e");
+		ua[id.address()] = id;
+	}
+
+	return ua;
+}
+
+static inline const char *_mkUpdateUrl()
+{
+#if defined(__LINUX__) && ( defined(__i386__) || defined(__x86_64) || defined(__x86_64__) || defined(__amd64) || defined(__i386) )
+	if (sizeof(void *) == 8)
+		return "http://download.zerotier.com/ZeroTierOneInstaller-linux-x64-LATEST.nfo";
+	else return "http://download.zerotier.com/ZeroTierOneInstaller-linux-x86-LATEST.nfo";
+#define GOT_UPDATE_URL
+#endif
+
+#ifdef __APPLE__
+	return "http://download.zerotier.com/ZeroTierOneInstaller-mac-combined-LATEST.nfo";
+#define GOT_UPDATE_URL
+#endif
+
+#ifdef __WINDOWS__
+	return "http://download.zerotier.com/ZeroTierOneInstaller-windows-intel-LATEST.nfo";
+#define GOT_UPDATE_URL
+#endif
+
+#ifndef GOT_UPDATE_URL
+	return "";
+#endif
+}
+
+SoftwareUpdater::SoftwareUpdater(const RuntimeEnvironment *renv) :
+	RR(renv),
+	_myVersion(packVersion(ZEROTIER_ONE_VERSION_MAJOR,ZEROTIER_ONE_VERSION_MINOR,ZEROTIER_ONE_VERSION_REVISION)),
+	_lastUpdateAttempt(0),
+	_status(UPDATE_STATUS_IDLE),
+	_die(false),
+	_lock()
+{
+}
+
+SoftwareUpdater::~SoftwareUpdater()
+{
+	_die = true;
+	for(;;) {
+		_lock.lock();
+		bool ip = (_status != UPDATE_STATUS_IDLE);
+		_lock.unlock();
+		if (ip)
+			Thread::sleep(500);
+		else break;
+	}
+}
+
+void SoftwareUpdater::cleanOldUpdates()
+{
+	std::string updatesDir(RR->homePath + ZT_PATH_SEPARATOR_S + "updates.d");
+	std::map<std::string,bool> dl(Utils::listDirectory(updatesDir.c_str()));
+	for(std::map<std::string,bool>::iterator i(dl.begin());i!=dl.end();++i) {
+		if (!i->second)
+			Utils::rm((updatesDir + ZT_PATH_SEPARATOR_S + i->first).c_str());
+	}
+}
+
+void SoftwareUpdater::sawRemoteVersion(unsigned int vmaj,unsigned int vmin,unsigned int rev)
+{
+	const uint64_t tmp = packVersion(vmaj,vmin,rev);
+	if (tmp > _myVersion) {
+		Mutex::Lock _l(_lock);
+		if ((_status == UPDATE_STATUS_IDLE)&&(!_die)&&(ZT_DEFAULTS.updateLatestNfoURL.length())) {
+			const uint64_t now = Utils::now();
+			if ((now - _lastUpdateAttempt) >= ZT_UPDATE_MIN_INTERVAL) {
+				_lastUpdateAttempt = now;
+				_status = UPDATE_STATUS_GETTING_NFO;
+				RR->http->GET(ZT_DEFAULTS.updateLatestNfoURL,HttpClient::NO_HEADERS,ZT_UPDATE_HTTP_TIMEOUT,&_cbHandleGetLatestVersionInfo,this);
+			}
+		}
+	}
+}
+
+void SoftwareUpdater::checkNow()
+{
+	Mutex::Lock _l(_lock);
+	if (_status == UPDATE_STATUS_IDLE) {
+		_lastUpdateAttempt = Utils::now();
+		_status = UPDATE_STATUS_GETTING_NFO;
+		RR->http->GET(ZT_DEFAULTS.updateLatestNfoURL,HttpClient::NO_HEADERS,ZT_UPDATE_HTTP_TIMEOUT,&_cbHandleGetLatestVersionInfo,this);
+	}
+}
+
+const char *SoftwareUpdater::parseNfo(
+	const char *nfoText,
+	unsigned int &vMajor,
+	unsigned int &vMinor,
+	unsigned int &vRevision,
+	Address &signedBy,
+	std::string &signature,
+	std::string &url)
+{
+	try {
+		Dictionary nfo(nfoText);
+
+		vMajor = Utils::strToUInt(nfo.get("vMajor").c_str());
+		vMinor = Utils::strToUInt(nfo.get("vMinor").c_str());
+		vRevision = Utils::strToUInt(nfo.get("vRevision").c_str());
+		signedBy = nfo.get("signedBy");
+		signature = Utils::unhex(nfo.get("ed25519"));
+		url = nfo.get("url");
+
+		if (signature.length() != ZT_C25519_SIGNATURE_LEN)
+			return "bad ed25519 signature, invalid length";
+		if ((url.length() <= 7)||(url.substr(0,7) != "http://"))
+			return "invalid URL, must begin with http://";
+
+		return (const char *)0;
+	} catch ( ... ) {
+		return "invalid NFO file format or one or more required fields missing";
+	}
+}
+
+bool SoftwareUpdater::validateUpdate(
+	const void *data,
+	unsigned int len,
+	const Address &signedBy,
+	const std::string &signature)
+{
+	std::map< Address,Identity >::const_iterator updateAuthority = ZT_DEFAULTS.updateAuthorities.find(signedBy);
+	if (updateAuthority == ZT_DEFAULTS.updateAuthorities.end())
+		return false;
+	return updateAuthority->second.verify(data,len,signature.data(),(unsigned int)signature.length());
+}
+
+void SoftwareUpdater::_cbHandleGetLatestVersionInfo(void *arg,int code,const std::string &url,const std::string &body)
+{
+	SoftwareUpdater *upd = (SoftwareUpdater *)arg;
+	const RuntimeEnvironment *RR = (const RuntimeEnvironment *)upd->RR;
+	Mutex::Lock _l(upd->_lock);
+
+	if ((upd->_die)||(upd->_status != UPDATE_STATUS_GETTING_NFO)) {
+		upd->_status = UPDATE_STATUS_IDLE;
+		return;
+	}
+
+	if (code != 200) {
+		LOG("software update check failed: server responded with code %d",code);
+		upd->_status = UPDATE_STATUS_IDLE;
+		return;
+	}
+
+	try {
+		unsigned int vMajor = 0,vMinor = 0,vRevision = 0;
+		Address signedBy;
+		std::string signature,url;
+
+		const char *err = parseNfo(body.c_str(),vMajor,vMinor,vRevision,signedBy,signature,url);
+
+		if (err) {
+			LOG("software update check aborted: .nfo file parse error: %s",err);
+			upd->_status = UPDATE_STATUS_IDLE;
+			return;
+		}
+
+		if (!ZT_DEFAULTS.updateAuthorities.count(signedBy)) {
+			LOG("software update check aborted: .nfo file specifies unknown signing authority");
+			upd->_status = UPDATE_STATUS_IDLE;
+			return;
+		}
+
+#ifndef ZT_ALWAYS_UPDATE /* for testing */
+		if (packVersion(vMajor,vMinor,vRevision) <= upd->_myVersion) {
+			TRACE("software update check complete: version on update site is not newer than my version, no update necessary");
+			upd->_status = UPDATE_STATUS_IDLE;
+			return;
+		}
+#endif
+
+		upd->_status = UPDATE_STATUS_GETTING_FILE;
+		upd->_signedBy = signedBy;
+		upd->_signature = signature;
+
+		RR->http->GET(url,HttpClient::NO_HEADERS,ZT_UPDATE_HTTP_TIMEOUT,&_cbHandleGetLatestVersionBinary,arg);
+	} catch ( ... ) {
+		LOG("software update check failed: .nfo file invalid or missing field(s)");
+		upd->_status = UPDATE_STATUS_IDLE;
+	}
+}
+
+void SoftwareUpdater::_cbHandleGetLatestVersionBinary(void *arg,int code,const std::string &url,const std::string &body)
+{
+	SoftwareUpdater *upd = (SoftwareUpdater *)arg;
+	const RuntimeEnvironment *RR = (const RuntimeEnvironment *)upd->RR;
+	Mutex::Lock _l(upd->_lock);
+
+	if (!validateUpdate(body.data(),(unsigned int)body.length(),upd->_signedBy,upd->_signature)) {
+		LOG("software update failed: update fetched from '%s' failed signature check (image size: %u)",url.c_str(),(unsigned int)body.length());
+		upd->_status = UPDATE_STATUS_IDLE;
+		return;
+	}
+
+	size_t lastSlash = url.rfind('/');
+	if (lastSlash == std::string::npos) { // sanity check, shouldn't happen
+		LOG("software update failed: invalid URL");
+		upd->_status = UPDATE_STATUS_IDLE;
+		return;
+	}
+	std::string updatesDir(RR->homePath + ZT_PATH_SEPARATOR_S + "updates.d");
+	std::string updateFilename(url.substr(lastSlash + 1));
+	if ((updateFilename.length() < 3)||(updateFilename.find("..") != std::string::npos)) {
+		LOG("software update failed: invalid URL: filename contains invalid characters");
+		upd->_status = UPDATE_STATUS_IDLE;
+		return;
+	}
+	for(std::string::iterator c(updateFilename.begin());c!=updateFilename.end();++c) {
+		// Only allow a list of whitelisted characters to make up the filename to prevent any
+		// path shenanigans, esp on Windows where / is not the path separator.
+		if (!strchr("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_.0123456789",*c)) {
+			LOG("software update failed: invalid URL: filename contains invalid characters");
+			upd->_status = UPDATE_STATUS_IDLE;
+			return;
+		}
+	}
+	std::string updatePath(updatesDir + ZT_PATH_SEPARATOR_S + updateFilename);
+#ifdef __WINDOWS__
+	CreateDirectoryA(updatesDir.c_str(),NULL);
+#else
+	mkdir(updatesDir.c_str(),0755);
+#endif
+
+	FILE *upf = fopen(updatePath.c_str(),"wb");
+	if (!upf) {
+		LOG("software update failed: unable to open %s for writing",updatePath.c_str());
+		upd->_status = UPDATE_STATUS_IDLE;
+		return;
+	}
+	if (fwrite(body.data(),body.length(),1,upf) != 1) {
+		LOG("software update failed: unable to write to %s",updatePath.c_str());
+		upd->_status = UPDATE_STATUS_IDLE;
+		fclose(upf);
+		Utils::rm(updatePath);
+		return;
+	}
+	fclose(upf);
+
+#ifdef __UNIX_LIKE__
+	::chmod(updatePath.c_str(),0755);
+#endif
+
+	// We exit with this reason code and the path as the text. It is the
+	// caller's responsibility (main.c) to pick this up and do the right
+	// thing.
+	upd->_status = UPDATE_STATUS_IDLE;
+	RR->node->terminate(Node::NODE_RESTART_FOR_UPGRADE,updatePath.c_str());
+}
+
+} // namespace ZeroTier