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Because Active Directory is an LDAP-compliant directory service, network clients use LDAP to query the Active Directory database. Every object in Active Directory is iden tified by a name, and LDAP standards determine how the objects are named. Active Directory uses a variety of object naming conventions: distinguished names, relative distinguished names, globally unique identifiers, and user principal names.

To read more about LDAP launch an Internet search engine and run a search for , RFC 1779, RFC 2247, and RFC 2251. RFC 1779 is entitled A String Representation of Distin guished Names, RFC 2247 is entitled Using Domains in LDAP/X.500 Distinguished Names, and RFC 2251 is entitled Lightweight Directory Access Protocol (v3).

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/** * Represents a school holding doors which may be * opened by various users. Using the EJB Security model, * access to open a particular door may be blocked * to certain users. * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> * @version $Revision: $ */ public interface SecureSchoolLocalBusiness { /** * Closes the school for business. At this point the * front door will be unlocked for all. * This method may only be called by users in role * {@link Roles#ADMIN}. */ void open(); /** * Closes the school for business. At this point the * front door will be locked for all but users * in role {@link Roles#ADMIN} * This method may only be called by admins. */ void close(); /** * Opens the front door. While school is open,

Follow these guidelines for encrypting communications:

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Every object in Active Directory has a distinguished name (DN) that uniquely identifies the object and contains sufficient information for a client to retrieve the object from the directory. The DN includes the name of the domain that holds the object, as well as the complete path through the container hierarchy to the object. For example, the follow ing DN identifies the user object Scott Cooper in the microsoft.com domain:

Use SSL to encrypt application data and authentication credentials for connections between clients and IIS. Use SSL or IPSec to secure data connections between IIS and databases or other server resources and IIS. Use IPSec or a VPN to secure authentication credentials and encrypt data connec tions between administrative workstations and IIS and between clients used for content management and IIS.

* any authenticated user may open the door, else * only the {@link Roles#ADMIN} may open. * * @throws SchoolClosedException If the current user * is not in {@link Roles#ADMIN} and is attempting to open * the door while {@link SecureSchoolLocalBusiness#isOpen()} * is false. */ void openFrontDoor() throws SchoolClosedException; /** * Opens the service door. Users in {@link Roles#STUDENT} * role may not open this door, but {@link Roles#ADMIN} * and {@link Roles#JANITOR} may. */ void openServiceDoor(); /** * Returns whether or not the school is open. When closed, only * the {@link Roles#ADMIN} is allowed access to all doors. Anyone, * even unauthenticated users, may check if school is open. * @return */ boolean isOpen(); }

In the DN, three LDAP abbreviations, CN, OU, and DC, are used for the naming attribute. CN indicates the object s common name, OU indicates the organizational unit name, and DC indicates the domain component name. DNs must be unique, because Active Directory does not allow duplicate DNs.

There are those who say that all Web servers should be administered only from the console to avoid possible compromise via remote administration methodologies. However, for large Web sites and organizations with multiple Web servers, administration via the console is impractical (although such organizations might consider it for spe cific sensitive IIS servers). Instead, remote administration is done via the Internet Infor mation Services Manger or terminal services. A third option, using the Remote Administration (HTML) tool, is generally avoided because it offers too many possibili ties for remote compromise. The rationale is that HTML access to the server from the Internet must be possible (unless, of course, it is an intranet-only Web server); therefore, the administration tool might be used in an attack. On the other hand, access via other administrative tools such as terminal services or the Internet Information Ser vices Manager can be blocked at the firewall. Follow these guidelines when designing secure remote administration: