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CHAPTER 8 s INTEGRATING OPENLDAP WITH APPLICATIONS, USER SYSTEMS, AND CLIENT TOOLS
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The gateway is configured and turned on by default. This configuration works well in the simplest of environments, but requires additional configuration when your LDAP environment is customized. You ll need to configure the authentication methods that users will use to securely access the directory. The authentication methods available to you are as follows: Clear text Clear text with SSL Both If you require secure access to your directory, you should enable SSL access only. To enable SSL, you must register your Exchange Server and obtain a certificate from a certificate authority (CA), which can be a local or enterprise CA or a third party, such as VeriSign. Next, you have to decide whether to permit anonymous access from users outside the organization. Depending on the configuration of your LDAP environment, critical data may or may not be exposed via an anonymous search. For example, if telephone numbers are considered intellectual property or have different security requirements, that may require authentication to see. Make sure all your LDAP clients follow security rules set within your company. With Exchange, you can t control overall access to the directory based on username and password, but you can selectively control access to attributes by anonymous or authenticated users or replicated sites. So an anonymous user could see the directory, but they ll see only the selected information. Other LDAP implementations offer more robust authentication. The ideal security would be public key, but this isn t available in current LDAP implementations. You ll need to configure the search types that determine how the directory will treat substring searches that is, partial and wildcard searches. Depending on your back-end server configurations, certain searches that contain wildcards aren t indexed and will cause significant delay on the client and server. For example, if a username search for uid=tjackiewicz will append an asterisk to the end of it, the search becomes uid=tjackiewicz*. Despite you inputting the entire search and not expecting a wildcard to be performed, the server will interpret the * as a wildcard search and take significantly longer to return results. The default treats any substring search as an initial search, providing better response to the user. Other default options involve allowing only initial searches (fast) or all substring searches (slow). Within this configuration, you can specify the maximum number of search results returned by the directory to the user. The default value is 100. You can raise or lower this number depending on how many directory entries you have or how much data you want to transmit to the user. In Exchange 5.5, you can configure the directory to return search results in chunks, such as 100 entries at a time. The final step during your configuration is to select the idle timeout interval for LDAP connections. The default setting in Exchange 5.0 is ten minutes. This is extremely high, and you should change this to a small value (such as 30 seconds) to improve directory access and query response times. For the sake of security, you ll need to access the Exchange Site Addressing configuration area to select which attributes you want internal users and the public to see in their search results. This is where you permit or deny access by attributing and publishing a subset of the Exchange global address list to the Internet as white pages, which are accessed by LDAP clients. (You can compare this feature to a meta-directory that serves as an intermediate layer between your authoritative data and a published set of information that exists on another server.)
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CHAPTER 8 s INTEGRATING OPENLDAP WITH APPLICATIONS, USER SYSTEMS, AND CLIENT TOOLS
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Exchange doesn t permit you to dynamically extend your directory schema in 5.0, but it does provide ten custom directory attributes. More features will be available as the LDAP interoperability matures and becomes more standardized. You ll need to make various decisions based on information available from your directory. For example, what will you do about users with several e-mail addresses in the directory One solution is to publish only the user s Internet mail address to anonymous users. For internal users, you can publish all the addresses (cc:Mail, Microsoft Mail, X.400) if you re certain this wouldn t cause too much confusion. Senders would select the one address that would be handled correctly by their own messaging system. You can select any or all of the attributes in Exchange for public view, but be aware that not all LDAP clients support all attributes. In addition, some expect only certain attribute names or have other limitations that will prevent them from appropriately dealing with the information you provide. Most of the current LDAP-compliant clients can search and view Exchange s attributes, but may not fully support all the basic or extended operations. For example, the Exchange 5.0 LDAP server doesn t support sounds like or Boolean searching. If a client tries to invoke these methods, Exchange Server returns a protocol error to the user. Although you can specify which attributes can be seen by anonymous or authenticated users and for intersite replication, you can t restrict a specific user or group from accessing the directory. Listing 8-12 is an example of how to identify and fetch user data in Internet Information Services (IIS) using Exchange and LDAP . Listing 8-12. Identifying and Fetching User Data in IIS <% Dim LUser, strQuery, strServerName, oConn, oRS, GreetName, ITuser LUser = Request.QueryString("LogonUser") strServerName = Put here your Exchange Server Name strQuery = "<LDAP://" & strServerName & ">;(uid=" & LUser & "); adspath,cn;subtree" 'Create ADO connection and set its properties Set oConn = Server.CreateObject("ADODB.Connection") oConn.Provider = "ADsDSOOBJECT" 'Pass the credentials to Exchange Server. oConn.Properties("User_ID") = "IUSR_MAIL" oConn.Properties("Password") = "IUSR_MAIL" oConn.Properties("Encrypt Password") = False oConn.Open "Active Directory Provider" Set oRS = oConn.Execute(strQuery) If oRS.BOF OR oRS.EOF Then Response.Write "Unable to retrieve information." Else Response.Write "CN: " & oRS.Fields("cn").Value End If
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