Problem - Kevin Tafuro

Sid
Buffer containing the SID to look up. This argument may not be specified as
NULL.
Name
Buffer into which the name will be written. Initially, you may specify this argument
as NULL to determine how large a buffer is required to hold the name.
cbName
Pointer to an integer that both specifies the size of the buffer to receive the name,
and receives the size of the buffer required for the name.
ReferencedDomainName
Buffer into which the domain name where the SID was found is to be written.
Initially, you may specify this argument as NULL to determine how large a buffer
is required to hold the domain name.
cbReferencedDomainName
Pointer to an integer that both specifies the size of the buffer to receive the
domain name, and receives the size of the buffer required for the domain name.
peUse
Pointer to an enumeration that receives the type of SID to which the looked-up
SID corresponds. The most commonly returned values are SidTypeUser (1) and
SidTypeGroup (2).
The following function, SpcLookupSid( ), is essentially a wrapper around
LookupAccountSid( ). It handles the nuances of performing SID lookup, including
allocating the necessary buffers and error conditions. If the SID is successfully found,
the return will be a pointer to a dynamically allocated buffer containing the user or
group name, which you must later free using LocalFree( ). If the SID could not be
found, NULL will be returned, and GetLastError( ) will return ERROR_NONE_MAPPED. If
any other kind of error occurs, SpcLookupSid( ) will return NULL, and GetLastError( )
will return the relevant error code.
#include
LPTSTR SpcLookupSid(LPCTSTR lpszSystemName, PSID Sid) {
DWORD cbName, cbReferencedDomainName;
LPTSTR lpszName, ReferencedDomainName;
SID_NAME_USE eUse;
cbName = cbReferencedDomainName = 0;
if (LookupAccountSid(lpszSystemName, Sid, 0, &cbName,
0, &cbReferencedDomainName, &eUse)) {
SetLastError(ERROR_NONE_MAPPED);
return 0;
}
if (GetLastError( ) != ERROR_INSUFFICIENT_BUFFER) return 0;
if (!(lpszName = (LPTSTR)LocalAlloc(LMEM_FIXED, cbName))) return 0;
378 | Chapter 8: Authentication and Key Exchange
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