CODEWITHSUNDEEP
c#c++winapieventsevent-handling
Alexandru
Alexandru

Reputation: 12912

How do I create a manual reset event that only allows access to particular user accounts in C++?

I am fairly new to C++...I have the CreateEvent working okay with this code:

HANDLE result = CreateEvent(NULL,                     // No security.
                            TRUE,                     // Manual-reset event.
                            FALSE,                    // Not signaled.
                            L"Global\\MyResetEvent"); // Event name.

But what do I have to do with the security attributes to have an equivalent of the following in C#?

SecurityIdentifier localSystemUsers = new SecurityIdentifier(WellKnownSidType.LocalSystemSid, null);
SecurityIdentifier adminUsers = new SecurityIdentifier(WellKnownSidType.BuiltinAdministratorsSid, null);
EventWaitHandleAccessRule localSystemRule = new EventWaitHandleAccessRule(localSystemUsers, EventWaitHandleRights.FullControl, AccessControlType.Allow);
EventWaitHandleAccessRule adminRule = new EventWaitHandleAccessRule(adminUsers, EventWaitHandleRights.Synchronize | EventWaitHandleRights.Modify, AccessControlType.Allow);
EventWaitHandleSecurity security = new EventWaitHandleSecurity();
security.AddAccessRule(localSystemRule);
security.AddAccessRule(adminRule);
bool createdNew;
event = new EventWaitHandle(false, EventResetMode.ManualReset, MyEventName, out createdNew, security);

Upvotes: 0

Views: 571

Answers (1)

Alexandru
Alexandru

Reputation: 12912

I think this should do it, in the end, thanks to this link:

    TCHAR *szSD = TEXT("D:")        // Discretionary ACL.
        TEXT("(A;OICI;GA;;;BA)");   // Allow full control to administrators.
        TEXT("(A;OICI;GA;;;SY)");   // Allow full control to the local system.
    SECURITY_ATTRIBUTES sa;
    sa.nLength = sizeof(SECURITY_ATTRIBUTES);
    sa.bInheritHandle = FALSE;
    ConvertStringSecurityDescriptorToSecurityDescriptor(szSD, SDDL_REVISION_1, &((&sa)->lpSecurityDescriptor), NULL);
    HANDLE result = CreateEvent(&sa, TRUE, FALSE, L"Global\\CustomManualResetEvent");

Upvotes: 1

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