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In this model, the client and the service do not attempt to authenticate each other directly. They use an intermediary that validates the client s identity and then provides a security token as proof of successful authentication. The client attaches this token to the request and the service uses this token to authenticate the client. In the real world this is equivalent to a passport or a driver s license, which is tamperproof and secure enough to be trusted. There are government agencies responsible for the validation of the person s identity and, in the case of the driver s license, validation of the person s driving skills. These agencies require different documentation to validate the person s identity. Once the license or passport is issued, the person can use it to identify himself at places such as banking institutions. Similar to this analogy, authentication brokers, such as VeriSign or Windows Active Directory, require the entity to provide enough information to validate its identity. In the case of VeriSign, it requires documentation to validate whether the organization is registered and legitimate and still active. Security tokens have a duration period; some of them, such as X.509 certificates, can last years, and some others, such as Kerberos tickets, can last only minutes or hours. The duration of an X.509 certificate depends on the criteria used by the certificate authority when it extends the certificate. In the case of VeriSign, it extends for a limited number of years, because with every renewal it wants to reverify whether your corporation is in good standing. An Active Directory Kerberos ticket has a default duration of ten hours; this value can be modified using the Group Policy Object Editor at the domain level. The diagram in Figure 7-2 shows a client that requests a security token and then uses it to communicate with two services. You can notice that the client only needs to request the token once during this session, which helps reduce the transaction time. Another important aspect of the diagram is that two services are using the same authentication broker. This is one of the main advantages of this model, because it provides a centralized authentication authority and it allows for easier management of the identity store.
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CHAPTER 7 EXTENDED WEB SERVICES SECURITY WITH WS-SECURITY AND WS-SECURE CONVERSATION
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Figure 7-2. A brokered authentication model
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Advantages and Disadvantages of Brokered Authentication
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The main advantages of brokered authentication are as follows: Centralized authentication: Having a single source for authentication simplifies the management of the identity information. The services won t need to create and manage their own set of users; they can rely upon the centralized identity broker to perform these tasks. Single sign-on (SSO) capabilities: This model allows clients to authenticate once and then use the same token for different services within the organization. Stronger security: Brokered authentication relies on robust authentication mechanisms such as X.509 certificates and Kerberos. The storage of passwords and the protection mechanisms are more reliable than those that could be implemented by a developer that follows a direct authentication pattern. Direct trust: In this scenario the client and the service don t need to trust each other directly. This means that the services can rely on somebody else to add, remove, and update the identity information from their client base.
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CHAPTER 7 EXTENDED WEB SERVICES SECURITY WITH WS-SECURITY AND WS-SECURE CONVERSATION
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The main disadvantages of brokered authentication are as follows: Single point of failure: If for any reason the authentication broker is not available or its security is compromised there could be a negative effect on the clients and services that rely upon it for identity management. This means that while the broker is not available, all the services that depend on it for authentication will not be accessible to process secure messages. This risk can be mitigated by having a backup server. If the security of the broker is compromised, the client or the service could be tricked to believe that it is communicating with an authorized entity. Existing infrastructure: Using brokered authentication requires existing infrastructure such as Active Directory or a PKI. If an organization does not have access to these resources it will need to obtain it before the implementation of this security model.
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