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//****************************************************************************
//
// Module: UNIMDM
// File: SEC.C
//
// Copyright (c) 1992-1996, Microsoft Corporation, all rights reserved
//
// Revision History
//
//
// 3/27/96 JosephJ Created
//
//
// Description: Security-related helper functions
//
//****************************************************************************
#define UNICODE
#include <windows.h>
#include <stdio.h>
#include "sec.h"
#define DPRINTF2(_format, _a1, _a2) printf(_format, _a1, _a2)
#define ASSERT(_c) \
((_c) ? 0: DPRINTF2("Assertion failed in %s:%d\n", __FILE__, __LINE__))
//****************************************************************************
// Description: This procedure will allocate and initialize a security
// descriptor with the specificed attributes.
//
// Returns: pointer to an allocated and initialized security descriptor.
// If NULL, GetLastError() will return the appropriate error code.
//
// History:
// 3/27/96 JosephJ Created
//****************************************************************************/
//
PSECURITY_DESCRIPTOR AllocateSecurityDescriptor (
PSID_IDENTIFIER_AUTHORITY pSIA,
DWORD dwRID,
DWORD dwRights,
PSID pSidOwner,
PSID pSidGroup
)
{
PSID pObjSid = NULL;
PACL pDacl = NULL;
PSECURITY_DESCRIPTOR pSD = NULL;
pSD = LocalAlloc(LPTR, SECURITY_DESCRIPTOR_MIN_LENGTH+256);
if (!pSD) goto end_fail;
// Set up the SID for the admins that will be allowed to have
// access. This SID will have 1 sub-authority
if (!AllocateAndInitializeSid(
pSIA,
1,
dwRID, 0, 0, 0, 0, 0, 0, 0,
&pObjSid
))
{
goto end_fail;
}
// Set up the DACL that will allow all processes with the above SID
// access specified in dwRights. It should be large enough to hold all ACEs.
//
{
DWORD cbDaclSize = sizeof(ACCESS_ALLOWED_ACE) +
GetLengthSid(pObjSid) +
sizeof(ACL);
pDacl = (PACL)LocalAlloc( LPTR, cbDaclSize );
if (!pDacl)
{
goto end_fail;
}
if ( !InitializeAcl( pDacl, cbDaclSize, ACL_REVISION2 ) )
{
goto end_fail;
}
}
// Add the ACE to the DACL
//
if ( !AddAccessAllowedAce( pDacl, ACL_REVISION2, dwRights, pObjSid))
{
goto end_fail;
}
// Create the security descriptor and put the DACL in it.
//
if ( !InitializeSecurityDescriptor(pSD, SECURITY_DESCRIPTOR_REVISION ))
{
goto end_fail;
}
if ( !SetSecurityDescriptorDacl(pSD, TRUE, pDacl, FALSE ) )
{
goto end_fail;
}
// Set owner for the descriptor
//
if ( !SetSecurityDescriptorOwner( pSD, pSidOwner, FALSE) )
{
goto end_fail;
}
// Set group for the descriptor
//
if ( !SetSecurityDescriptorGroup( pSD, pSidGroup, FALSE) )
{
goto end_fail;
}
FreeSid(pObjSid);
return pSD;
end_fail:
{
DWORD dwRetCode = GetLastError();
if (pDacl) { LocalFree(pDacl); pDacl=0;}
if (pObjSid) { FreeSid(pObjSid); pObjSid=0;}
if (pSD) { LocalFree(pSD); pSD=0;}
SetLastError(dwRetCode);
}
return NULL;
}
//****************************************************************************
// Description: Frees a security descriptor previously allocated by
// AllocateSecurityDescriptor.
//
// History:
// 3/27/96 JosephJ Created
//****************************************************************************/
void FreeSecurityDescriptor(PSECURITY_DESCRIPTOR pSD)
{
PSID pObjSid = NULL;
PACL pDacl = NULL;
BOOL fGotAcl=FALSE, fByDefault=FALSE;
// Free Dacl, if user had allocated it.
if (GetSecurityDescriptorDacl(pSD, &fGotAcl, &pDacl, &fByDefault ))
{
if (fGotAcl && !fByDefault && pDacl)
{
LocalFree(pDacl);
}
}
else
{
ASSERT(FALSE); // We should not be calling this function with such
// an pSD.
}
LocalFree(pSD);
}
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