/// <summary>
/// Do an access check between a security descriptor and a token to determine the allowed access.
/// </summary>
/// <param name="sd">The security descriptor</param>
/// <param name="token">The access token.</param>
/// <param name="access_rights">The set of access rights to check against</param>
/// <param name="generic_mapping">The type specific generic mapping (get from corresponding NtType entry).</param>
/// <returns>The allowed access mask as a unsigned integer.</returns>
/// <exception cref="NtException">Thrown if an error occurred in the access check.</exception>
public static uint GetAllowedAccess(SecurityDescriptor sd, NtToken token, GenericAccessRights access_rights, GenericMapping generic_mapping)
{
if (sd == null)
{
throw new ArgumentNullException("sd");
}
if (token == null)
{
throw new ArgumentNullException("token");
}
using (var sd_buffer = sd.ToSafeBuffer())
{
using (NtToken imp_token = token.DuplicateToken(SecurityImpersonationLevel.Identification))
{
uint granted_access;
NtStatus result_status;
using (var privs = new SafePrivilegeSetBuffer())
{
int buffer_length = privs.Length;
NtSystemCalls.NtAccessCheck(sd_buffer, imp_token.Handle, (uint)access_rights,
ref generic_mapping, privs, ref buffer_length, out granted_access, out result_status).ToNtException();
if (result_status.IsSuccess())
{
return(granted_access);
}
return(0);
}
}
}
}
