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While reading the explanation of filters, you may have been puzzled by the term thread context and may have expected the authentication information to be stored within the request context. Storing the authentication information within the request context makes perfect sense for a web application when you are concerned with restricting access to URLs and otherwise carrying out web-oriented security operations, but there is more to security than preventing access to URLs. You may wish to write code that is aware of the specifics of the user currently accessing the database. In our example application, a typical example of this requirement is the need to ensure that a specific user does not access other users timesheets. The URL concerns cannot help us: all users access the timesheet application by the same means, so we need to ensure that a user who manages to get a request for another user s timesheet past the filters cannot actually access the data in question. The simplest way to prevent this access is to check the authenticated user s name against the request for the data. To do so, we need to access the information in layers of the software that should not have access to a servlet request object. These layers should work equally well in a stand-alone Swing application that carries out its authentication by using a dialog box. The authentication and authorization information is therefore stored in a thread-local variable that is accessible through a static method on the SecurityContextHolder class. A call to this getContext() method allows the authentication object established elsewhere to be retrieved, as shown in Listing 7-21.

Usually comparing the data in a column to a value or comparing the values from two columns returns either TRUE or FALSE. If the expression evaluates to TRUE, then the row is returned. If the expression evaluates to FALSE, then the row is not returned. If a value in the expression contains NULL, then the expression is resolved to UNKNOWN. In some ways, the behavior is like FALSE. When an expression resolves to UNKNOWN, the row is not returned. The problems begin when using any operator except for equal to (=). The opposite of FALSE is TRUE, but the opposite of UNKNOWN is still UNKNOWN. Neglecting to take possible NULL values into consideration can often cause incorrect results. Always remember to think about NULL values, especially whenever writing any expression containing NOT. Do the NULL values belong in the results If so, you will have to check for NULL. You will also need to keep NULL values in mind when using less than. NULL values will be left out of those results as well. 3 will show you some other options for working with NULL. Understanding how NULL values can affect the results of your queries is one of the most important skills you will learn. Even experienced T-SQL developers struggle from time to time when working with NULL values. Be sure to complete Exercise 2-5 to practice what you have just learned.

Click one of the packets to display more detail. For every packet that s captured, you can analyze all its layers. The top part of the Wireshark capture result window displays just the list of packets, but, after selecting a packet in the lower part, you ll see the packet s different headers. If you really need to see details of any of these parts, click the part you want to zoom in on to display its contents. You may even see passwords being sent in plain text over the network.

Exercise 2-5

The essence of SSH is its security, and public and private keys naturally play an important role in it On first making contact, the client and the server exchange public and private keys In this communication, the server creates a key based on its private key the so-called host key and uses this as its proof of identity When connecting, the server sends its public key to the client If this is the first time the client has connected to this host, the host replies with the message that shown in Listing 8-18 Listing 8-18 Establishing an SSH Session with an Unknown Host root@ZNA:~# ssh 192168170 The authenticity of host '192168170 (192168170)' can't be established RSA key fingerprint is fd:07:f6:ce:5d:df:6f:a2:84:38:c7:89:f1:3a:a6:34 Are you sure you want to continue connecting (yes/no) yes Warning: Permanently added '1921681.