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Sunday, March 30, 2008

Creating DACL

Creating a DACL
Creating a proper discretionary access control list (DACL) is a necessary and important part of application development. Because a NULL DACL permits all types of access to all users, do not use NULL DACLs.
The following example shows how to properly create a DACL. The example contains a function, CreateMyDACL, that uses the security descriptor definition language (SDDL) to define the granted and denied access control in a DACL. To provide different access for your application's objects, modify the CreateMyDACL function as needed.
In the example:
The main function passes an address of a SECURITY_ATTRIBUTES structure to the CreateMyDACL function.
The CreateMyDACL function uses SDDL strings to:
Deny access to guest and anonymous logon users.
Allow read/write/execute access to authenticated users.
Allow full control to administrators. For more information about the SDDL string formats, see Security Descriptor String Format.
The CreateMyDACL function calls the ConvertStringSecurityDescriptorToSecurityDescriptor function to convert the SDDL strings to a security descriptor. The security descriptor is pointed to by the lpSecurityDescriptor member of the SECURITY_ATTRIBUTES structure. CreateMyDACL sends the return value from ConvertStringSecurityDescriptorToSecurityDescriptor to the main function.
The main function uses the updated SECURITY_ATTRIBUTES structure to specify the DACL for a new folder that is created by the CreateDirectory function.
When the main function is finished using the SECURITY_ATTRIBUTES structure, the main function frees the memory allocated for the lpSecurityDescriptor member by calling the LocalFree function.
Note To successfully compile SDDL functions such as ConvertStringSecurityDescriptorToSecurityDescriptor, you must define the _WIN32_WINNT constant as 0x0500 or greater.
Copy Code
#define _WIN32_WINNT 0x0500
#include <windows.h>
#include <sddl.h>
#include <stdio.h>
BOOL CreateMyDACL(SECURITY_ATTRIBUTES *);
void main()
{

SECURITY_ATTRIBUTES sa;
sa.nLength = sizeof(SECURITY_ATTRIBUTES);
sa.bInheritHandle = FALSE;
// Call function to set the DACL. The DACL
// is set in the SECURITY_ATTRIBUTES
// lpSecurityDescriptor member.
if (!CreateMyDACL(&sa))
{
// Error encountered; generate message and exit.
printf("Failed CreateMyDACL\n");
exit(1);
}
// Use the updated SECURITY_ATTRIBUTES to specify
// security attributes for securable objects.
// This example uses security attributes during
// creation of a new directory.
if (0 == CreateDirectory(TEXT("C:\\MyFolder"), &sa))
{
// Error encountered; generate message and exit.
printf("Failed CreateDirectory\n");
exit(1);
}
// Free the memory allocated for the SECURITY_DESCRIPTOR.
if (NULL != LocalFree(sa.lpSecurityDescriptor))
{
// Error encountered; generate message and exit.
printf("Failed LocalFree\n");
exit(1);
}
}
// CreateMyDACL.
// Create a security descriptor that contains the DACL
// you want.
// This function uses SDDL to make Deny and Allow ACEs.
//
// Parameter:
// SECURITY_ATTRIBUTES * pSA
// Pointer to a SECURITY_ATTRIBUTES structure. It is your
// responsibility to properly initialize the
// structure and to free the structure's
// lpSecurityDescriptor member when you have
// finished using it. To free the structure's
// lpSecurityDescriptor member, call the
// LocalFree function.
//
// Return value:
// FALSE if the address to the structure is NULL.
// Otherwise, this function returns the value from the
// ConvertStringSecurityDescriptorToSecurityDescriptor
// function.

BOOL CreateMyDACL(SECURITY_ATTRIBUTES * pSA)
{

// Define the SDDL for the DACL. This example sets
// the following access:
// Built-in guests are denied all access.
// Anonymous logon is denied all access.
// Authenticated users are allowed
// read/write/execute access.
// Administrators are allowed full control.
// Modify these values as needed to generate the proper
// DACL for your application.
TCHAR * szSD = TEXT("D:"); // Discretionary ACL
TEXT("(D;OICI;GA;;;BG)"); // Deny access to
// built-in guests
TEXT("(D;OICI;GA;;;AN)"); // Deny access to
// anonymous logon
TEXT("(A;OICI;GRGWGX;;;AU)") ;
// Allow read/write/execute
// to authenticated users
TEXT("(A;OICI;GA;;;BA)"); // Allow full control
// to administrators
if (NULL == pSA)
return FALSE;
return ConvertStringSecurityDescriptorToSecurityDescriptor(
szSD,
SDDL_REVISION_1,
&(pSA->lpSecurityDescriptor),
NULL);


}

Origin Article : http://msdn2.microsoft.com/en-us/library/ms717798(VS.85).aspx

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