I want to set a mutex in one windows account and allow another windows account to access this mutex.
For testing I have two forms that create a mutex using the C# mutex class. I am logging into Windows XP as "User1" and creating and locking the mutex from "User1" using the 1st form. I then use the "switch users" function to log in as "User2" and run the 2nd form and attempt to create the mutex (using the same name). When I try this I get access denied.
I have then tried to use the Win32 classes (as below) but still not working (same problem "access denied"). Any ideas?
namespace MyWin32API
{
// Required SecurityAttributes Structure LPSECURITY_ATTRIBUTES
[StructLayout(LayoutKind.Sequential)]
public class SecurityAttributes
{
public int nLength = Marshal.SizeOf(typeof(SecurityAttributes));
public long lpSecurityDescriptor;
public bool bInheritHandle;
}
public class CWin32
{
// Security Rights Constants - See Winnt.h
public const UInt32 SYNCHRONIZE = 0x00100000;
public const UInt32 STANDARD_RIGHTS_REQUIRED = 0x000F0000;
public const UInt32 MUTANT_QUERY_STATE = 0x0001;
// Security Rights Constants - See winbase.h and winnt.h
public static UInt32 MUTEX_ALL_ACCESS = (SYNCHRONIZE |
STANDARD_RIGHTS_REQUIRED | MUTANT_QUERY_STATE);
//CreateMutex
[DllImport("kernel32.dll", SetLastError=true)]
private static extern UInt32 CreateMutex(SecurityAttributes
lpMutexAttributes, bool InitialOwner, string MutexName);
// Win 32 Masked Method - does not use return handle currently
public UInt32 Win32CreateMutex(bool InitialOwner, string MutexName)
{
SecurityAttributes sa = new SecurityAttributes();
sa.bInheritHandle = false;
sa.lpSecurityDescriptor = CWin32.MUTEX_ALL_ACCESS;
return CWin32.CreateMutex(sa,InitialOwner,MutexName);
}
}
Thank you,
Kris 2 7023
You need to create a DACL containing an ACE's for all trustee's you want to
access the Mutex object, and set the DACL's address in the
SecurityAttributes lpSecurityDescriptor member.
Willy.
"Kris" <an*******@discussions.microsoft.com> wrote in message
news:F8**********************************@microsof t.com... I want to set a mutex in one windows account and allow another windows account to access this mutex.
For testing I have two forms that create a mutex using the C# mutex class. I am logging into Windows XP as "User1" and creating and locking the mutex from "User1" using the 1st form. I then use the "switch users" function to log in as "User2" and run the 2nd form and attempt to create the mutex (using the same name). When I try this I get access denied.
I have then tried to use the Win32 classes (as below) but still not working (same problem "access denied"). Any ideas?
namespace MyWin32API {
// Required SecurityAttributes Structure LPSECURITY_ATTRIBUTES [StructLayout(LayoutKind.Sequential)] public class SecurityAttributes { public int nLength = Marshal.SizeOf(typeof(SecurityAttributes)); public long lpSecurityDescriptor; public bool bInheritHandle; } public class CWin32 {
// Security Rights Constants - See Winnt.h public const UInt32 SYNCHRONIZE = 0x00100000; public const UInt32 STANDARD_RIGHTS_REQUIRED = 0x000F0000; public const UInt32 MUTANT_QUERY_STATE = 0x0001;
// Security Rights Constants - See winbase.h and winnt.h public static UInt32 MUTEX_ALL_ACCESS = (SYNCHRONIZE | STANDARD_RIGHTS_REQUIRED | MUTANT_QUERY_STATE); //CreateMutex [DllImport("kernel32.dll", SetLastError=true)] private static extern UInt32 CreateMutex(SecurityAttributes lpMutexAttributes, bool InitialOwner, string MutexName);
// Win 32 Masked Method - does not use return handle currently public UInt32 Win32CreateMutex(bool InitialOwner, string MutexName) { SecurityAttributes sa = new SecurityAttributes(); sa.bInheritHandle = false; sa.lpSecurityDescriptor = CWin32.MUTEX_ALL_ACCESS;
return CWin32.CreateMutex(sa,InitialOwner,MutexName); } }
Thank you,
Kris
You need to create a DACL containing an ACE's for all trustee's you want to
access the Mutex object, and set the DACL's address in the
SecurityAttributes lpSecurityDescriptor member.
Willy.
"Kris" <an*******@discussions.microsoft.com> wrote in message
news:F8**********************************@microsof t.com... I want to set a mutex in one windows account and allow another windows account to access this mutex.
For testing I have two forms that create a mutex using the C# mutex class. I am logging into Windows XP as "User1" and creating and locking the mutex from "User1" using the 1st form. I then use the "switch users" function to log in as "User2" and run the 2nd form and attempt to create the mutex (using the same name). When I try this I get access denied.
I have then tried to use the Win32 classes (as below) but still not working (same problem "access denied"). Any ideas?
namespace MyWin32API {
// Required SecurityAttributes Structure LPSECURITY_ATTRIBUTES [StructLayout(LayoutKind.Sequential)] public class SecurityAttributes { public int nLength = Marshal.SizeOf(typeof(SecurityAttributes)); public long lpSecurityDescriptor; public bool bInheritHandle; } public class CWin32 {
// Security Rights Constants - See Winnt.h public const UInt32 SYNCHRONIZE = 0x00100000; public const UInt32 STANDARD_RIGHTS_REQUIRED = 0x000F0000; public const UInt32 MUTANT_QUERY_STATE = 0x0001;
// Security Rights Constants - See winbase.h and winnt.h public static UInt32 MUTEX_ALL_ACCESS = (SYNCHRONIZE | STANDARD_RIGHTS_REQUIRED | MUTANT_QUERY_STATE); //CreateMutex [DllImport("kernel32.dll", SetLastError=true)] private static extern UInt32 CreateMutex(SecurityAttributes lpMutexAttributes, bool InitialOwner, string MutexName);
// Win 32 Masked Method - does not use return handle currently public UInt32 Win32CreateMutex(bool InitialOwner, string MutexName) { SecurityAttributes sa = new SecurityAttributes(); sa.bInheritHandle = false; sa.lpSecurityDescriptor = CWin32.MUTEX_ALL_ACCESS;
return CWin32.CreateMutex(sa,InitialOwner,MutexName); } }
Thank you,
Kris This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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