kfwlogon corrections for XP

This patch addresses a problem discovered on some XP systems.
After rundll32.exe starts, the CreateProcess can fail to 
start kfwcpcc.exe if the current directory is not %WinDir%\System32.
CreateProcess() should be called with the lpApplicationName parameter
set to NULL in order to permit the use of the PATH.

Also, in ConfigureLogonScript ensure that the trailing NUL of the
constructed command line is processed when producing the wide 
character version of the string.

ticket: new
component: windows
tags: pullup

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@19488 dc483132-0cff-0310-8789-dd5450dbe970

1 files changed, 11 insertions, 9 deletions

diff --git a/src/windows/kfwlogon/kfwlogon.c b/src/windows/kfwlogon/kfwlogon.c
index f76da3cab3..8422f58b11 100644
--- a/src/windows/kfwlogon/kfwlogon.c
+++ b/src/windows/kfwlogon/kfwlogon.c
@@ -136,6 +136,8 @@ is_windows_vista(void)
 /* Construct a Logon Script that will cause the LogonEventHandler to be executed

  * under in the logon session 

  */

+

+#define RUNDLL32_CMDLINE "rundll32.exe kfwlogon.dll,LogonEventHandler "

 VOID 

 ConfigureLogonScript(LPWSTR *lpLogonScript, char * filename) {

     DWORD dwLogonScriptLen;

@@ -149,23 +151,20 @@ ConfigureLogonScript(LPWSTR *lpLogonScript, char * filename) {
     if (!filename)

 	return;

 

-    dwLogonScriptLen = strlen("rundll32.exe kfwlogon.dll,LogonEventHandler ") + strlen(filename) + 1;

+    dwLogonScriptLen = strlen(RUNDLL32_CMDLINE) + strlen(filename) + 2;

     lpTemp = (LPSTR) malloc(dwLogonScriptLen); 

     if (!lpTemp)

 	return;

 

-    _snprintf(lpTemp, dwLogonScriptLen, 

-	     "rundll32.exe kfwlogon.dll,LogonEventHandler %s",

-	     filename);

+    _snprintf(lpTemp, dwLogonScriptLen, "%s%s", RUNDLL32_CMDLINE, filename);

 

     SetLastError(0);

-    dwLogonScriptLen = MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, lpTemp, strlen(lpTemp), NULL, 0);

+    dwLogonScriptLen = MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, lpTemp, -1, NULL, 0);

     DebugEvent("ConfigureLogonScript %s requires %d bytes gle=0x%x", lpTemp, dwLogonScriptLen, GetLastError());

 

     lpScript = LocalAlloc(LMEM_ZEROINIT, dwLogonScriptLen * 2);

     if (lpScript) {

-	if (MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, lpTemp, strlen(lpTemp), 

-				 lpScript, 2 * dwLogonScriptLen))

+	if (MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, lpTemp, -1, lpScript, 2 * dwLogonScriptLen))

 	    *lpLogonScript = lpScript;

 	else {

 	    DebugEvent("ConfigureLogonScript - MultiByteToWideChar failed gle = 0x%x", GetLastError());

@@ -605,7 +604,8 @@ LogonEventHandlerA(HWND hwnd, HINSTANCE hinst, LPSTR lpszCmdLine, int nCmdShow)
     _snprintf(commandline, sizeof(commandline), "kfwcpcc.exe \"%s\"", lpszCmdLine);

 

     GetStartupInfo(&startupinfo);

-    if (CreateProcess( "kfwcpcc.exe",

+    SetLastError(0);

+    if (CreateProcess( NULL,

 		       commandline,

 		       NULL,

 		       NULL,

@@ -623,7 +623,9 @@ LogonEventHandlerA(HWND hwnd, HINSTANCE hinst, LPSTR lpszCmdLine, int nCmdShow)
 	CloseHandle(procinfo.hThread);

 	CloseHandle(procinfo.hProcess);

     } else {

-	DebugEvent0("KFW_Logon_Event - CreateProcessFailed");

+	DebugEvent("KFW_Logon_Event - CreateProcessFailed \"%s\" GLE 0x%x", 

+                     commandline, GetLastError());

+        DebugEvent("KFW_Logon_Event PATH %s", getenv("PATH"));

     }

 

     DeleteFile(lpszCmdLine);