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Maintaining a separate password file to specify the names of users who can access certain directories on your web server is not the most practical way of implementing decent web server security. It is much more useful if you can maintain the user database somewhere external. One but by far not the only option you can use for this purpose is LDAP authentication. Now, Apache is not aware of any LDAP server by itself; fortunately, it isn t that hard to teach Apache that it should use LDAP for authentication purposes. To do this, you first need to make sure two modules are used with your Apache web server: mod_ldap and mod_auth_ldap. To use mod_auth_ldap for LDAP-based authentication, you need to make sure both of the LDAP modules are loaded. On SUSE Linux Enterprise Server, you can handle this from the module s configuration file, which is /etc/apache2/sysconfig.d/loadmodule.conf. In this file, make sure the following two lines appear somewhere (of course after verifying that both modules are really present in the /usr/lib/apache2-prefork directory): LoadModule mod_ldap LoadModule mod_auth_ldap /usr/lib/apache2-perfork/mod_ldap.so /usr/lib/apache2-prefork/mod_auth_ldap.so

Network: Administrators can now disable Internet Sharing, AirPort, and Bluetooth for client computers Parental Controls: Administrators can hide profanity in the dictionary, control access to web sites, set the amount of time per day that a computer is allowed to be used, and set times when login is not allowed in this new managed preference Printing: Users can be forced to put their username, date, and/or MAC address in a page that is sent with each print job System Preferences: Users can be allowed or denied access to each system preference You can enforce these managed preferences on systems that use Active Directory by modifying the LDAP schema in Active Directory Once the schema has been modified, you will be able to use Workgroup Manager to configure managed preferences as you do with Mac OS X Server.

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if you need to ensure that a reference is immutable, then mark the reference as final. However, this might make the code harder to test, as it means that the unit test code won t be able to substitute its own mock implementation. One way around this is to assign the complex type on construction: public class DBManager { private final DBConnectionManager dbManager; public DBManager(DBConnectionManager dbManager) { this.dbManager = dbManager; }

Once you have enabled both modules, you need to include some code that handles the proper security settings. For LDAP-based authentication, it is common to use the Location directive as an alternative to the Directory directive. The related code can look like Listing 22-8.

Third-party applications, such as Thursby s ADmitMac, will store this managed preference data outside of Active Directory, allowing you to manage your Mac OS X clients without modifying your Active Directory infrastructure (which most Active Directory administrators are not going to want to do) Other third-party directory clients, such as Centrify s DirectControl or Likewise, rely primarily on custom code for preference management..

Listing 22-8. Working with LDAP-Based Authentication <Location "/internal"> AuthName "confidential data" AuthType Basic AuthLDAPHosts "ldapserver someserver:636" AuthLDAPBaseDN "type=user, o=somewhere,c=nl" AuthLDAPSearchScope base AuthLDAPUserKey webuser AuthLDAPPassKey webpassword require group accountants require valid-user </Location> In the previous example, you can see that a location is defined. This is a directory that is under the document root. Next, certain sections specify where and what should be searched for in the directory. In this example, the search is for users in the container o=somewhere,c=nl. These users use the webuser property for their username and the webpassword property for the password. Of course, you can use any other valid property from the LDAP directory for this purpose as well. Check 17 for more details about LDAP.

This will allow a test to still pass in its own mock implementation assuming that it s instantiating this particular object directly.

NOTE: Most Active Directory administrators are generally hesitant to modify the LDAP schema, because schema extensions cannot be undone in Active Directory.

By default, the Apache web server sends all its traffic unencrypted Therefore, if someone is listening with a sniffer and you send sensitive information, they could capture and read that information To protect against this, you can use SSL encryption In 21 you can read all about this encryption technique; therefore, in this chapter I won t go through the entire process of creating certificates and signing them I ll just discuss how to create a test certificate and use that with the Apache web server The resulting communication is as follows: 1 The user connects to a web address where the URL starts with https:// and connects to the default SSL port of the web server, which is port 443 2 The web browser requests the server for its public key, and the web server sends it 3.

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