327 lines
8.9 KiB
C++
327 lines
8.9 KiB
C++
/*
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* synergy-plus -- mouse and keyboard sharing utility
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* Copyright (C) 2010 The Synergy+ Project
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*
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* This package is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* found in the file COPYING that should have accompanied this file.
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*
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* This package is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "CMSWindowsRelauncher.h"
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#include "CThread.h"
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#include "TMethodJob.h"
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#include "CLog.h"
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#include "CArch.h"
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#include "Version.h"
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#include "CArchDaemonWindows.h"
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#include <Tlhelp32.h>
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#include <UserEnv.h>
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#include <sstream>
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CMSWindowsRelauncher::CMSWindowsRelauncher() :
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m_thread(NULL)
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{
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}
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CMSWindowsRelauncher::~CMSWindowsRelauncher()
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{
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delete m_thread;
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}
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void
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CMSWindowsRelauncher::startAsync()
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{
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m_thread = new CThread(new TMethodJob<CMSWindowsRelauncher>(
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this, &CMSWindowsRelauncher::startThread, nullptr));
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}
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void
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CMSWindowsRelauncher::startThread(void*)
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{
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LOG((CLOG_NOTE "starting relaunch service"));
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int ret = relaunchLoop();
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// HACK: this actually throws an exception to exit with 0 (nasty)
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ARCH->util().app().m_bye(ret);
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}
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// this still gets the physical session (the one the keyboard and
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// mouse is connected to), sometimes this returns -1 but not sure why
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DWORD
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CMSWindowsRelauncher::getSessionId()
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{
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return WTSGetActiveConsoleSessionId();
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}
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BOOL
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CMSWindowsRelauncher::winlogonInSession(DWORD sessionId, PHANDLE process)
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{
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// first we need to take a snapshot of the running processes
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HANDLE snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
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if (snapshot == INVALID_HANDLE_VALUE) {
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LOG((CLOG_ERR "could not get process snapshot (error: %i)",
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GetLastError()));
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return 0;
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}
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PROCESSENTRY32 entry;
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entry.dwSize = sizeof(PROCESSENTRY32);
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// get the first process, and if we can't do that then it's
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// unlikely we can go any further
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BOOL gotEntry = Process32First(snapshot, &entry);
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if (!gotEntry) {
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LOG((CLOG_ERR "could not get first process entry (error: %i)",
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GetLastError()));
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return 0;
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}
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// used to record process names for debug info
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std::list<std::string> nameList;
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// now just iterate until we can find winlogon.exe pid
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DWORD pid = 0;
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while(gotEntry) {
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// make sure we're not checking the system process
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if (entry.th32ProcessID != 0) {
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DWORD processSessionId;
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BOOL pidToSidRet = ProcessIdToSessionId(
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entry.th32ProcessID, &processSessionId);
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if (!pidToSidRet) {
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LOG((CLOG_ERR "could not get session id for process id %i (error: %i)",
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entry.th32ProcessID, GetLastError()));
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return 0;
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}
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// only pay attention to processes in the active session
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if (processSessionId == sessionId) {
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// store the names so we can record them for debug
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nameList.push_back(entry.szExeFile);
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if (_stricmp(entry.szExeFile, "winlogon.exe") == 0) {
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pid = entry.th32ProcessID;
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break;
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}
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}
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}
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// now move on to the next entry (if we're not at the end)
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gotEntry = Process32Next(snapshot, &entry);
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if (!gotEntry) {
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DWORD err = GetLastError();
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if (err != ERROR_NO_MORE_FILES) {
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// only worry about error if it's not the end of the snapshot
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LOG((CLOG_ERR "could not get subsiquent process entry (error: %i)",
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GetLastError()));
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return 0;
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}
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}
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}
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std::string nameListJoin;
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for(std::list<std::string>::iterator it = nameList.begin();
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it != nameList.end(); it++) {
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nameListJoin.append(*it);
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nameListJoin.append(", ");
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}
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LOG((CLOG_DEBUG "checked processes while looking for winlogon.exe: %s",
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nameListJoin.c_str()));
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CloseHandle(snapshot);
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if (pid) {
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// now get the process so we can get the process, with which
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// we'll use to get the process token.
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*process = OpenProcess(MAXIMUM_ALLOWED, FALSE, pid);
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return true;
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}
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else {
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LOG((CLOG_DEBUG "could not find winlogon.exe in session %i", sessionId));
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return false;
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}
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}
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// gets the current user (so we can launch under their session)
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HANDLE
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CMSWindowsRelauncher::getCurrentUserToken(DWORD sessionId, LPSECURITY_ATTRIBUTES security)
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{
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HANDLE currentToken;
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HANDLE winlogonProcess;
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if (winlogonInSession(sessionId, &winlogonProcess)) {
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LOG((CLOG_DEBUG "session %i has winlogon.exe", sessionId));
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// get the token, so we can re-launch with this token
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// -- do we really need all these access bits?
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BOOL tokenRet = OpenProcessToken(
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winlogonProcess,
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TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY |
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TOKEN_DUPLICATE | TOKEN_ASSIGN_PRIMARY |
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TOKEN_ADJUST_SESSIONID | TOKEN_READ | TOKEN_WRITE,
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¤tToken);
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}
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else {
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LOG((CLOG_ERR "session %i does not have winlogon.exe "
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"which is needed for re-launch", sessionId));
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return 0;
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}
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HANDLE primaryToken;
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BOOL duplicateRet = DuplicateTokenEx(
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currentToken, MAXIMUM_ALLOWED, security,
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SecurityImpersonation, TokenPrimary, &primaryToken);
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if (!duplicateRet) {
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LOG((CLOG_ERR "could not duplicate token %i (error: %i)",
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currentToken, GetLastError()));
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return 0;
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}
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return primaryToken;
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}
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int
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CMSWindowsRelauncher::relaunchLoop()
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{
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// start with invalid id (gets re-assigned on first loop)
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DWORD sessionId = -1;
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// keep here so we can check if proc running -- huh?
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PROCESS_INFORMATION pi;
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ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));
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int returnCode = kExitSuccess;
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bool launched = false;
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// TODO: fix this hack BEFORE release; we need to exit gracefully instead
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// of being force killed!
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bool loopRunning = true;
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while (loopRunning) {
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DWORD newSessionId = getSessionId();
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// only enter here when id changes, and the session isn't -1, which
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// may mean that there is no active session.
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if ((newSessionId != sessionId) && (newSessionId != -1)) {
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// HACK: doesn't close process in a nice way
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// TODO: use CloseMainWindow instead
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if (launched) {
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TerminateProcess(pi.hProcess, kExitSuccess);
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LOG((CLOG_DEBUG "terminated existing process to make way for new one"));
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launched = false;
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}
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// ok, this is now the active session (forget the old one if any)
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sessionId = newSessionId;
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SECURITY_ATTRIBUTES sa;
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ZeroMemory(&sa, sizeof(SECURITY_ATTRIBUTES));
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// get the token for the user in active session, which is the
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// one receiving input from mouse and keyboard.
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HANDLE userToken = getCurrentUserToken(sessionId, &sa);
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if (userToken != 0) {
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LOG((CLOG_DEBUG "got user token to launch new process"));
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std::string cmd = getCommand();
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// in case reusing process info struct
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ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));
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STARTUPINFO si;
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ZeroMemory(&si, sizeof(STARTUPINFO));
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si.cb = sizeof(STARTUPINFO);
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si.lpDesktop = "winsta0\\default";
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LPVOID environment;
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BOOL blockRet = CreateEnvironmentBlock(&environment, userToken, FALSE);
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if (!blockRet) {
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LOG((CLOG_ERR "could not create environment block (error: %i)",
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GetLastError()));
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returnCode = kExitFailed;
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loopRunning = false; // stop loop
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}
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else {
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DWORD creationFlags =
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NORMAL_PRIORITY_CLASS |
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CREATE_NO_WINDOW |
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CREATE_UNICODE_ENVIRONMENT;
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// re-launch in current active user session
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BOOL createRet = CreateProcessAsUser(
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userToken, NULL, LPSTR(cmd.c_str()),
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&sa, NULL, TRUE, creationFlags,
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environment, NULL, &si, &pi);
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DestroyEnvironmentBlock(environment);
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CloseHandle(userToken);
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if (!createRet) {
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LOG((CLOG_ERR "could not launch (error: %i)", GetLastError()));
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returnCode = kExitFailed;
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loopRunning = false;
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}
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else {
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LOG((CLOG_DEBUG "launched in session %i (cmd: %s)",
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sessionId, cmd.c_str()));
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launched = true;
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}
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}
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}
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}
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// check for session change every second
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ARCH->sleep(1);
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}
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if (launched) {
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// HACK: kill just in case process it has survived somehow
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TerminateProcess(pi.hProcess, kExitSuccess);
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}
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return kExitSuccess;
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}
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std::string CMSWindowsRelauncher::getCommand()
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{
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// seems like a fairly convoluted way to get the process name
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const char* launchName = ARCH->util().app().argsBase().m_pname;
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std::string args = ((CArchDaemonWindows&)ARCH->daemon()).commandLine();
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// build up a full command line
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std::stringstream cmdTemp;
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cmdTemp << launchName << /*" --debug-data session-" << sessionId <<*/ args;
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std::string cmd = cmdTemp.str();
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size_t i;
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std::string find = "--relaunch";
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while((i = cmd.find(find)) != std::string::npos) {
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cmd.replace(i, find.length(), "");
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}
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return cmd;
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}
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