IPC on Vista (service and application)

Question

I am creating an appcation on Vista,which include a service and a Console application .Both running in same user account In service i am creating an event and waits for that event.In console application i am opening the same event (problem starts here) and calling SetEvent function. I can not open the event (getting error 5,Access is denied) in the console application.I searched in the net and saw something about integrity level (I am not sure that the problem is related to integrity level).Its telling that service and applicaation got differnt integrity levels. here is the part of the code,where IPC occures service DWORD WINAPI IpcThread(LPVOID lpParam) { HANDLE ghRequestEvent = NULL ; ghRequestEvent = CreateEvent(NULL, FALSE, FALSE, "Global\\Event1") ; //creating the event if(NULL == ghRequestEvent) { //error } while(1) { WaitForSingleObject(ghRequestEvent, INFINITE) //waiting for the event //here some action related to event } } Console Application Here in application ,opening the event and seting the event unsigned int event_notification() { HANDLE ghRequestEvent = NULL ; ghRequestEvent = OpenEvent(SYNCHRONIZE|EVENT_MODIFY_STATE, FALSE, "Global\\Event1") ; if(NULL == ghRequestEvent) { //error } SetEvent(ghRequestEvent) ; } I am running both application (serivce and console application) with administrative privilege (i logged in as Administraor and running the console application by right clicking and using the option "run as administrator") . The error i am getting in console application (where i am opening the event) is error no 5(Access is denied. ) . So it will be very helpfull if you tell how to do the IPC between a service and an application in Vista Thanks in advance Navaneeth JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

Are the service and the application running as the same user with different integrity levels, or are they running as different users? If it is the former, then this article from MSDN which talks about integrity levels might help. They have some sample code for lowering the integrity level of a file. I'm not sure that this could be relevant for an event though. #include #include #include void SetLowLabelToFile() { // The LABEL_SECURITY_INFORMATION SDDL SACL to be set for low integrity #define LOW_INTEGRITY_SDDL_SACL_W L"S:(ML;;NW;;;LW)" DWORD dwErr = ERROR_SUCCESS; PSECURITY_DESCRIPTOR pSD = NULL; PACL pSacl = NULL; // not allocated BOOL fSaclPresent = FALSE; BOOL fSaclDefaulted = FALSE; LPCWSTR pwszFileName = L"Sample.txt"; if (ConvertStringSecurityDescriptorToSecurityDescriptorW( LOW_INTEGRITY_SDDL_SACL_W, SDDL_REVISION_1, &pSD;, NULL)) { if (GetSecurityDescriptorSacl(pSD, &fSaclPresent;, &pSacl;, &fSaclDefaulted;)) { // Note that psidOwner, psidGroup, and pDacl are // all NULL and set the new LABEL_SECURITY_INFORMATION dwErr = SetNamedSecurityInfoW((LPWSTR) pwszFileName, SE_FILE_OBJECT, LABEL_SECURITY_INFORMATION, NULL, NULL, NULL, pSacl); } LocalFree(pSD); } } If it is the latter you might look at this link which suggests creating a NULL ACL and associating it with the object (in the example it is a named pipe, but the approach is similar for an event I'm sure: BYTE sd[SECURITY_DESCRIPTOR_MIN_LENGTH]; SECURITY_ATTRIBUTES sa; sa.nLength = sizeof(sa); sa.bInheritHandle = TRUE; sa.lpSecurityDescriptor = &sd; InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION); SetSecurityDescriptorDacl(&sd, TRUE, (PACL) 0, FALSE); CreateNamedPipe(..., &sa);