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cross users named pipes

Posted on 1998-11-26
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Last Modified: 2013-12-03
I tried running a simple-client server
program using named pipes, when different users are
running the client and the server.
I got ACCESS_DENIED error when the client used CreateFile
to connect to the pipe.
Should the server change the sercurity attributes of the
named pipe ?
I created the pipe with default security attributes.

Could you tell me exactly how to allow a client to
connect to a named pipe (a short working piece of code
will be welcomed).

thanks in advance,
Avi.
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Question by:kavas
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4 Comments
 
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Expert Comment

by:lortega
ID: 1416379
both users must have running windows NT, windows 95 just can't create a server side of a named pipe...
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Author Comment

by:kavas
ID: 1416380
Both of my client and server are running windows NT.

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Author Comment

by:kavas
ID: 1416381
Adjusted points to 150
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LVL 3

Accepted Solution

by:
stefanr earned 450 total points
ID: 1416382
Create a NULL DACL, that will allow all access to the named pipe:

PSECURITY_DESCRIPTOR pSecurityDescriptor = PSECURITY_DESCRIPTOR(new BYTE[SECURITY_DESCRIPTOR_MIN_LENGTH]);

::InitializeSecurityDescriptor(pSecurityDescriptor, SECURITY_DESCRIPTOR_REVISION);
::SetSecurityDescriptorDacl(pSecurityDescriptor, TRUE, NULL, FALSE);

SECURITY_ATTRIBUTES SecurityAttributes = { 0 };

SecurityAttributes.nLength = sizeof(SECURITY_ATTRIBUTES);
SecurityAttributes.lpSecurityDescriptor = pSecurityDescriptor;
SecurityAttributes.bInheritHandle = FALSE;

HANDLE hFile =
      ::CreateFile(
         sPipeName,                 // LPCTSTR lpFileName: pointer to name of the file
         dwDesiredAccess,           // DWORD dwDesiredAccess: access (read-write) mode
         dwShareMode,               // DWORD dwShareMode: share mode
         &SecurityAttributes, // LPSECURITY_ATTRIBUTES lpSecurityAttributes: pointer to security attributes
         dwCreationDisposition,     // DWORD dwCreationDisposition: how to create
         dwFlagsAndAttributes,      // DWORD dwFlagsAndAttributes: file attributes
         NULL                       // HANDLE hTemplateFile: handle to file with attributes to copy
      );

delete pSecurityDescriptor;

if (INVALID_HANDLE_VALUE == hFile)
   return FALSE;

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