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Drawing QR in Java PART II

PART II
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@ManagedBean @RequestScoped public class SecurityBacking { public String logout() { String result = "/login faces-redirect=true"; FacesContext context = FacesContextgetCurrentInstance(); HttpServletRequest request = (HttpServletRequest) context getExternalContext()getRequest(); try { requestlogout( ); } catch (ServletException ex) { LoggergetLogger(SecurityBackingclassgetName()) log(LevelSEVERE, null, ex); result = "/loginError faces-redirect=true"; } return result; } }
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The only interesting thing about this page is the call to requestlogout( ) This method will make the container unaware of the authentication credentials, thus requiring the container to forward the user to the login page when that user tries to access a forbidden page
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Certificate Authentication
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Client certificate authentication is the most secure of the standard forms of containermanaged security Unfortunately, even though parts of setting up certificate authentication are standardized, a complete implementation requires significant vendor-specific configuration steps Therefore, this section presents a higher-level view of performing authentication using certificates than was provided for basic or form-based authentication We must first introduce the concept of public key cryptography before we can explain the concept of an identity certificate The easiest way to share data securely is to encrypt it using some scheme and share the password with the party with whom you want to share the data Of course, the matter of sharing the password securely is a problem, but let s just say you can tell the person directly While the shared password scheme is easy to understand and implement, it doesn t scale to large numbers of users without compromising security
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Part II:
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Extending JavaServer Faces
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Public key cryptography, also called public key infrastructure, or PKI, solves the problem by breaking the concept of a password into two parts, a public key and a private key The archetypal analogy to describe PKI involves two people Alice and Bob who want to send messages to each other through the postal mail In order for Alice to send a message to Bob securely, Alice asks Bob to send her his open padlock, to which only Bob has the key Alice then puts the message in the box and locks it with Bob s padlock, sending it in the mail When Bob receives the box he can open the box with his key and see the message Conversely, when Bob wants to send a message to Alice, he needs Alice s open padlock In PKI, the padlock is the public key, and the key for the padlock is the private key This situation is depicted in Figure 14-2 In order to share data with someone, you need their public key and your private key; therefore, it is desirable to distribute your public key as widely as possible That s where the infrastructure in public key infrastructure really comes in When padlocks (public keys)
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Bob s padlock From: Bob To: Alice
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>Click! From: Alice To: Bob
Public key Secret message Bob s private key Private key
FIGURE 14-2
Public key infrastructure
14:
Securing JavaServer Faces Applications
are freely distributed, the problem is verifying that Alice s padlock really belongs to Alice and not some malicious postman who opened the mail and replaced Alice s padlock with his own, only to intercept the return package and open the box The authenticity of a public key is determined using an identity certificate When speaking of Internet security, an identity certificate is an electronic document originating from a trusted source that vouches for the authenticity of a public key The source from which the certificate originates is known as the certificate authority (CA), and there are a handful of such bodies in business around the world today CACert, Thawte, and VeriSign are three popular CAs To bring the matter back to Web applications, servers and clients may possess their own public keys, and identity certificates to vouch for them, to encrypt all the traffic between client and server Because Web applications are by nature interactive, clients must authenticate themselves to servers as well as servers to clients This is known as two-way authentication and is the standard practice when using client certificate authentication Once the certificates have been authenticated, the public keys are used to establish a secure transport connection, such as with the Secure Sockets Layer (SSL) Whenever you see a URL that begins with https:, you re using SSL To enable client certificate authentication, you need to put the following in your loginconfig element:
<login-method> <auth-method>CLIENT-CERT</auth-method> <realm-name>admin-realm</realm-name> </login-method>
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