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i486 · Mar 26, 2022 · edc8b7d · edc8b7d
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diff --git a/ChangeLog.txt b/ChangeLog.txt
diff --git a/KexCfg/KexCfg.c b/KexCfg/KexCfg.c
@@ -0,0 +1,161 @@
+#include <Windows.h>
+#include <Shlwapi.h>
+#include <ShlObj.h>
+#include <winternl.h>
+#include <KexComm.h>
+
+#define APPNAME T("KexCfg")
+#define FRIENDLYAPPNAME T("VxKex Configuration Tool")
+
+#pragma comment(linker,"\"/manifestdependency:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"")
+
+// KexCfg is a helper program which is used to enable or disable VxKex for
+// specific .EXE files. It is only meant to be invoked by the configuration
+// shell extension or other programs which are associated with VxKex. The
+// reason why we need a helper program is because this program might need to
+// be restarted with administrator privileges in order to change the IFEO
+// registry options.
+//
+// The command line must be in the following format:
+// A STR parameter is a quoted string. The string must be double quoted.
+// There is no escape character and therefore STR parameters cannot contain
+// double quotes.
+// A BOOL parameter is an unquoted number either 1 or 0.
+//
+//   <<STR1>> <BOOL1> <STR2> <BOOL2> <BOOL3> <BOOL4> <BOOL5>
+//
+// STR1 parameter indicates the full path of the .exe file of the program
+// which configuration is being set for.
+// BOOL1 parameter is whether or not to enable VxKex for this program.
+// STR2 parameter may consist of the following values and determines whether
+// the Windows version reported to the application will be spoofed:
+//   NONE - no spoofing
+//   WIN8 - Windows 8
+//   WIN81 - Windows 8.1
+//   WIN10 - Windows 10
+//   WIN11 - Windows 11
+// Any unrecognized value is equivalent to NONE.
+// BOOL2 parameter is whether debugging information will always be shown.
+// BOOL3 parameter is whether VxKex will be disabled for child processes.
+// BOOL4 parameter is whether all app-specific hacks will be disabled.
+// BOOL5 parameter is whether the VxKexLdr will wait for its child to exit
+// before itself exiting.
+//
+// The behavior of the program when arguments are provided but do not match
+// the template is undefined.
+
+INT APIENTRY tWinMain(
+	IN	HINSTANCE	hInstance,
+	IN	HINSTANCE	hPrevInstance,
+	IN	LPTSTR		lpszCmdLine,
+	IN	INT			iCmdShow)
+{
+	BOOL bRetryAsAdminOnFailure = FALSE;
+	TCHAR szExePath[MAX_PATH];
+	TCHAR szExeName[MAX_PATH];
+	TCHAR szWinVerSpoof[6];
+	TCHAR szVxKexLdrPath[MAX_PATH];
+	TCHAR szIfeoKey[74 + MAX_PATH] = T("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Image File Execution Options\\");
+	TCHAR szKexIfeoKey[54 + MAX_PATH] = T("SOFTWARE\\VXsoft\\VxKexLdr\\Image File Execution Options\\");
+	TCHAR szSystem32Path[MAX_PATH];
+
+	DWORD dwEnableVxKex;
+	DWORD dwAlwaysShowDebug;
+	DWORD dwDisableForChild;
+	DWORD dwDisableAppSpecific;
+	DWORD dwWaitForChild;
+
+	SetFriendlyAppName(FRIENDLYAPPNAME);
+
+	if (lpszCmdLine == NULL || strlen(lpszCmdLine) == 0) {
+		// TODO: display something more useful to the user here e.g. a global configuration panel
+		InfoBoxF(T("This application is not intended to be used standalone. To configure VxKex for a program, ")
+				 T("open the Properties dialog for that program and select the 'VxKex' tab."));
+		ExitProcess(0);
+	}
+
+	sscanf_s(lpszCmdLine, T("\"%259[^\"]\" %I32u \"%5[^\"]\" %I32u %I32u %I32u %I32u"),
+			 szExePath,				ARRAYSIZE(szExePath),
+			 &dwEnableVxKex,
+			 szWinVerSpoof,			ARRAYSIZE(szWinVerSpoof),
+			 &dwAlwaysShowDebug,
+			 &dwDisableForChild,
+			 &dwDisableAppSpecific,
+			 &dwWaitForChild);
+
+	if (PathIsRelative(szExePath)) {
+		CriticalErrorBoxF(T("An absolute path must be passed to ") APPNAME T("."));
+	}
+
+	strcpy_s(szExeName, ARRAYSIZE(szExeName), szExePath);
+	PathStripPath(szExeName);
+	strcat_s(szIfeoKey, ARRAYSIZE(szIfeoKey), szExeName);
+	strcat_s(szKexIfeoKey, ARRAYSIZE(szKexIfeoKey), szExePath);
+	CHECKED(RegReadSz(HKEY_LOCAL_MACHINE, T("SOFTWARE\\VXsoft\\VxKexLdr"), T("KexDir"), szVxKexLdrPath, ARRAYSIZE(szVxKexLdrPath)));
+	strcat_s(szVxKexLdrPath, ARRAYSIZE(szVxKexLdrPath), T("\\VxKexLdr.exe"));
+	CHECKED(GetSystemDirectory(szSystem32Path, ARRAYSIZE(szSystem32Path)));
+	bRetryAsAdminOnFailure = TRUE;
+
+	if (dwEnableVxKex) {
+		TCHAR szOldDebugger[MAX_PATH];
+
+		if (RegReadSz(HKEY_LOCAL_MACHINE, szIfeoKey, T("Debugger"), szOldDebugger, ARRAYSIZE(szOldDebugger)) &&
+			!lstrcmpi(szOldDebugger, szVxKexLdrPath)) {
+			// no need to try to write anything to the "Debugger" value
+			// do nothing
+		} else {
+			CHECKED(RegWriteSz(HKEY_LOCAL_MACHINE, szIfeoKey, T("Debugger"), szVxKexLdrPath));
+		}
+	} else {
+		TCHAR szOldDebugger[MAX_PATH];
+
+		// Likewise, only delete the registry key if it exists. This helps avoid spurious
+		// UAC prompts.
+		if (RegReadSz(HKEY_LOCAL_MACHINE, szIfeoKey, T("Debugger"), szOldDebugger, ARRAYSIZE(szOldDebugger))) {
+			// Don't use CHECKED() here because it will sometimes fail wrongly
+			// when the "Debugger" value doesn't exist (e.g. if you disable VxKex twice in a row)
+			if (!RegDelValue(HKEY_LOCAL_MACHINE, szIfeoKey, T("Debugger")) && GetLastError() != ERROR_FILE_NOT_FOUND) {
+				goto Error;
+			}
+		}
+	}
+
+	// This creates a tree structure under the kex IFEO key.
+	// VxKexLdr
+	//   Image File Execution Options
+	//     C:
+	//       Users
+	//         Bob
+	//           Programs
+	//             program.exe
+	//               EnableVxKex(REG_DWORD) = 1
+	//               WinVerSpoof(REG_SZ) = "WIN10"
+	// etc., since backslashes aren't permitted in registry key names.
+	CHECKED(RegWriteDw(HKEY_CURRENT_USER, szKexIfeoKey, T("EnableVxKex"), dwEnableVxKex));
+	CHECKED(RegWriteSz(HKEY_CURRENT_USER, szKexIfeoKey, T("WinVerSpoof"), szWinVerSpoof));
+	CHECKED(RegWriteDw(HKEY_CURRENT_USER, szKexIfeoKey, T("AlwaysShowDebug"), dwAlwaysShowDebug));
+	CHECKED(RegWriteDw(HKEY_CURRENT_USER, szKexIfeoKey, T("DisableForChild"), dwDisableForChild));
+	CHECKED(RegWriteDw(HKEY_CURRENT_USER, szKexIfeoKey, T("DisableAppSpecific"), dwDisableAppSpecific));
+	CHECKED(RegWriteDw(HKEY_CURRENT_USER, szKexIfeoKey, T("WaitForChild"), dwWaitForChild));
+
+	ExitProcess(0);
+
+Error:
+	if (bRetryAsAdminOnFailure && GetLastError() == ERROR_ACCESS_DENIED) {
+		TCHAR szSelfPath[MAX_PATH];
+
+		// if a CHECKED statement fails in here, we will effectively "fall through" to the
+		// other code path which just gives up.
+		bRetryAsAdminOnFailure = FALSE;
+
+		CHECKED(GetModuleFileName(NULL, szSelfPath, ARRAYSIZE(szSelfPath)));
+		CHECKED(ShellExecute(NULL, T("runas"), szSelfPath, lpszCmdLine, NULL, 0) > (HINSTANCE) 32);
+		ExitProcess(0);
+	} else if (GetLastError() == ERROR_CANCELLED) {
+		// don't display an unnecessary warning box if the user simply clicked no on the UAC box
+		ExitProcess(0);
+	} else {
+		CriticalErrorBoxF(T("A critical error was encountered while attempting to operate on %s.\nError code: %#010I32x: %s"),
+						  szExePath, GetLastError(), GetLastErrorAsString());
+	}
+}
diff --git a/KexCfg/KexCfg.vcxproj b/KexCfg/KexCfg.vcxproj
@@ -0,0 +1,155 @@
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+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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+      <Platform>x64</Platform>
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+    <ProjectGuid>{3E126701-0D6C-404F-821D-F51F2B1BB0FB}</ProjectGuid>
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diff --git a/KexCfg/KexCfg.vcxproj.filters b/KexCfg/KexCfg.vcxproj.filters
@@ -0,0 +1,22 @@
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diff --git a/KexCfg/KexCfg.vcxproj.user b/KexCfg/KexCfg.vcxproj.user
@@ -0,0 +1,7 @@
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