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160 Lotus Security Handbook The last step in our design model process is to analyze the design’s possible data flows and data access to ensure the design meets our security policy. The primary focus of the design validation review is to ensure: 1. Adherence to our flow control policy tables in the previous section. This means that we need to examine all client-server and server-to-server network data flows. 2. Data access methods used match the data classification assigned to the data. Next we will walk through an example of an application data flow review. 4.3.1 Data flow example In this section we describe a fictitious infrastructure design that incorporates our different security architecture concepts. The Acme company is designing a Web portal for external suppliers. One part of the portal content is being served by a Lotus Domino application. Other content will be provided by WebSphere Application Server. The suppliers will be issued user IDs, and the credentials (passwords) will be stored in an LDAP directory. Tivoli Access Manager will be used for access controls to different portal content back-end URLs. Based on the data classification policies at Acme, any data deemed “sensitive” that is accessed from any network other than the internal network (Intranet) must provide minimal access control of simple authentication with encryption. Data deemed “confidential” that is accessed from any network other than the internal network (Intranet) must provide minimal access control of strong authentication with encryption. We have classified the supplier directory information as “confidential,” and the portal content as “sensitive.” Figure 4-11 depicts our logical architecture.
Supplier (end-user) WebSeal Proxy WebSeal Proxy Proxy Zone 1 7 Websphere Portal Server IP Load Balancer Figure 4-11 Data flow example 8 8 Websphere Application Server 3 Domino Server (content) Internet Zone Zone boundary router/ firewall 1 6 Tivoli Access Manager Zone boundary router/firewall 11 Zone boundary router/firewall Intranet Zone 2 4 Websphere Server (staging) Domino Server (staging) 10 9 Administrator External DNS Proxy Zone 2 <strong>IBM</strong> Directory Server (LDAP) Data Access Zone 1 Data Access Zone 2 Data Access Zone 3 Chapter 4. Security components and layers 161 12 5
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* Notes SDK include files */ #inclu
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} /*--- * filter termination */ uns
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* *********************************
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Hostname="localhost.dotnsf.com" Por
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