4. FAQ o Win API

 Q> Как SID привести к текстовому виду(например для загрузки HKEY_USERS)?
 A> См.исходник:

// nearly straight from the SDK
BOOL Sid2Text( PSID ps, char *buf, int bufSize )
{
 PSID_IDENTIFIER_AUTHORITY psia;
 DWORD dwSubAuthorities;
 DWORD dwSidRev = SID_REVISION;
 DWORD i;
 int n, size;
 char *p;

 // Validate the binary SID.

 if ( ! IsValidSid( ps ) )
  return FALSE;

 // Get the identifier authority value from the SID.

 psia = GetSidIdentifierAuthority( ps );

 // Get the number of subauthorities in the SID.

 dwSubAuthorities = *GetSidSubAuthorityCount( ps );

 // Compute the buffer length.
 // S-SID_REVISION- + IdentifierAuthority- + subauthorities- + NULL

 size = 15 + 12 + ( 12 * dwSubAuthorities ) + 1;

 // Check input buffer length.
 // If too small, indicate the proper size and set last error.

 if ( bufSize < size )
 {
  SetLastError( ERROR_INSUFFICIENT_BUFFER );
  return FALSE;
 }

 // Add 'S' prefix and revision number to the string.

 size = wsprintf( buf, "S-%lu-", dwSidRev );
 p = buf + size;

 // Add SID identifier authority to the string.

 if ( psia->Value[0] != 0 || psia->Value[1] != 0 )
 {
  n = wsprintf( p, "0x%02hx%02hx%02hx%02hx%02hx%02hx",
  (USHORT) psia->Value[0], (USHORT) psia->Value[1],
  (USHORT) psia->Value[2], (USHORT) psia->Value[3],
  (USHORT) psia->Value[4], (USHORT) psia->Value[5] );
  size += n;
  p += n;
 }
 else
 {
  n = wsprintf( p, "%lu", ( (ULONG) psia->Value[5] ) +
  ( (ULONG) psia->Value[4] << 8 ) + ( (ULONG) psia->Value[3] << 16 ) +
  ( (ULONG) psia->Value[2] << 24 ) );
  size += n;
  p += n;
 }

 // Add SID subauthorities to the string.

 for ( i = 0; i < dwSubAuthorities; ++ i )
 {
  n = wsprintf( p, "-%lu", *GetSidSubAuthority( ps, i ) );
  size += n;
  p += n;
 }

 return TRUE;
}

2000(c) DM

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