Access Control for Existing or New Applications in Java

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In the past, application developers were always faced with decisions on how to control access to their code, and often they ended up building access control into their application code As a result, many of these applications required each user to be entered into a table or le With LDAP, applications or processes can validate against the directory Some simple pseudocode to handle this function is as follows:
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obtain user ID and password search for the entry with the specified user ID if found, authenticate using the DN of the entry and the supplied password if authentication failed, user is not authorized check if user is allowed access to the application entry by attempting to read it if allowed, continue the operation
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Encapsulating this functionality into a JavaBean, class library, or EJB (Enterprise JavaBean) on the network that communicates with the directory to handle authentication information can make this a one-line check for the Java developer The SDK code to authenticate against the directory is very short (shown here as a snippet, with error handling omitted for brevity):
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LDAPConnection ldap_conn = new LDAPConnection(); try { ldap_connconnect( HOSTNAME,PORT); String[] attrs = { ldap_connNO_ATTRS }; LDAPSearchResults res = ldap_connsearch( BASE, ldap_connSCOPE_SUB, "uid=" + uid, attrs, false); // Need the DN for authentication String dn = resnext()getDN(); // Attempt validation ldap_connauthenticate( dn, pwd ); // User authenticated } catch (LDAPException e) { // User not validated } if ( ( ld != null ) && ldisConnected() ) { try { lddisconnect(); } catch ( LDAPException e ) { Systemoutprintln( etoString() ); } }
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The SDK and SDK source code included on the CD-ROM are version 40 of Directory SDK for Java To obtain the latest version of this software, visit the Netscape developer site at http://developernetscapecom/tech/directory/downloadshtml You will be presented with a choice to download the software If the version on the Web site is newer than 40, download the latest Directory SDK for Java The complete source code to the SDK is also available at http://wwwmozillaorg/directory/ Directory SDK for Java works with Java Development Kit (JDK) 11 or higher The GUI examples in this book require JDK 12 or higher because they use Swing 11
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After downloading and expanding the compressed le in a location of your choice, you will have a series of subdirectories To make it easier to follow the examples in the book, we recommend installing the les in the following location:
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c:\netscape\ldapjava (Windows) /usr/opt/netscape/ldapjava (UNIX)
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The directory that contains ldapjava will be referred to in the text as <LDAPSDKHOME> For example, <LDAPSDKHOME>/doc refers to the doc directory of the SDK Figure 3-3 illustrates the directory structure of the SDK installation <LDAPSDKHOME>/doc contains the entire documentation set for the SDK in HTML format To use the documentation, point your browser at the indexhtml le <LDAPSDKHOME>/examples contains many code samples, including code that calls the SDK from JavaScript and code that uses LDAP JavaBeans <LDAPSDKHOME>/tools contains command-line tools source code that implements the functionality of the platform-native command-line tools included with Netscape Directory Server <LDAPSDKHOME>/beans contains LDAP JavaBean class les <LDAPSDKHOME>/packages contains two JAR les that contain the classes of the SDK Make sure you also have a Java compiler (javac) in your PATH The compiler must be version 11 or later (12 or later for the GUI examples) The next step is to set up your Java CLASSPATH environment variable to include the two JAR les in the <LDAPSDKHOME>/packages directory These les are ldapjdkjar and ldapfiltjar The CLASSPATH settings shown in the examples that follow should be applied so that they take effect for all windows opened (de ned in your cshrc or autoexecbat les, or in Control Panel/System/Environment) In UNIX with csh or tcsh, use the following command:
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