Writing LDAP Applets for Netscape Navigator 207 in Java

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Writing LDAP Applets for Netscape Navigator 207
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to grant privileges when your applet needs to connect to the LDAP server In the latter case, the user will be prompted to grant privileges when the applet loads The netscapesecurityPrivilegeManager class is in the java40jar le that comes with Netscape Navigator To compile code that references the class, you will need to add the JAR le to your CLASSPATH In Windows NT, for example, use the following command:
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set CLASSPATH=%CLASSPATH%;"c:\Program Files\Netscape\Communicator\Program\Java\Classes\java40jar"
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You can also have your code invoke enablePrivilege dynamically (using re ection) to avoid including java40jar in your CLASSPATH:
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javalangreflectMethod getEnabler() throws ClassNotFoundException { SecurityManager sec = SystemgetSecurityManager(); if ( (sec == null) || sectoString()startsWith( "javalangNullSecurityManager") ) { /* Not an applet; we can do what we want to */ return null; } else if (sectoString()startsWith( "netscapesecurityAppletSecurity")) { /* Running as applet PrivilegeManager around */ Class c = ClassforName( "netscapesecurityPrivilegeManager"); javalangreflectMethod[] m = cgetMethods(); for( int i = 0; i < mlength; i++ ) { if ( m[i]getName()equals("enablePrivilege") ) { return m[i]; } } } return null; } // Time to request network connection privileges try { javalangreflectMethod m = getEnabler(); if (m != null) { Object[] args = new Object[1];
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208 More Power to the Browser: An Applet That Speaks LDAP
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args[0] = new String("UniversalConnect"); minvoke( null, args); } catch (Exception ie) { Systemerrprintln( "Invoking enablePrivilege: " + ietoString() ); }
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Be careful where you invoke the enablePrivilege method You should not invoke this method within a public helper method (for example, a public method to open network connections) that another applet could subvert If you want to restrict the amount of your code that allows network connections, you can invoke the revertPrivilege method of the PrivilegeManager class after you are done with the network connection After you invoke this method, the privilege is no longer enabled Note, however, that the privilege is still granted by the user, which means that you can invoke the enablePrivilege method again without prompting the user again for permission The Privilege Manager inserts security information into the stack of the caller This means that the application retains any privileges only until it returns from the method where they were acquired If you create a method that just calls netscapesecurityPrivilegeManagerenablePrivilege and then returns, the privileges will have been relinquished by the time the caller of the method regains control:
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void callEnable() { netscapesecurityPrivilegeManagerenablePrivilege( "UniversalConnect" ); } void mainMethod() { callEnable(); // Request privileges try { ldcconnect( "myhostairiuscom", 389 ); // The call will fail with a Navigator exception // because the privileges were released on return from // callEnable()
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For more information on privileges and the capabilities model, see the following references: Introduction to the Capabilities Classes (at http://developer netscapecom/docs/manuals/signedobj/capabilities/indexhtml) Netscape System Targets (at http://developernetscapecom/docs/ manuals/signedobj/targets/indexhtm)
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Writing LDAP Applets for Netscape Navigator 209
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When you are ready to test your applet, you should sign your code with your digital certi cate and package your code with the digital signatures and certi cates into a JAR le To sign your code, you need the following: An object-signing certi cate and the corresponding private key (you can request the certi cate from your company s certi cate authority or from an independent authority, such as VeriSign) The certi cate of the certi cate authority who issued your object-signing certi cate Netscape Signing Tool (download from http://developernetscapecom/ software/signedobj/indexhtml content=jarpackhtml) There is valuable information on using the SigningTool in Signing Software with the Netscape Signing Tool Before you sign your code, read the documentation at http://developernetscapecom/docs/manuals/signedobj/signtool/indexhtm If you have not received your object-signing certi cate but you want to test your applet, you have the following options: You can use Netscape Signing Tool to generate a test public-private key pair and a self-signed certi cate for object signing You can set up your copy of Netscape Navigator to allow the codebase of the applet (the HTTP or le URL) to serve as the principal (rather than the signing certi cate) If you do this, you do not need to use Netscape Signing Tool to sign your code For more details, see the section Using the Codebase as a Principal later in the chapter
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