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Do notice, however, that you need to repeat this procedure for every key-secured server with which you want to be able to establish a session Working with keys as described in these steps is an excellent way to make SSH authentication more secure But there s a drawback: if you need to establish an SSH session automatically from a shell script or cron job, it s not very handy if you re first prompted for a key Therefore, some method is needed to execute such jobs automatically One solution is to create a special user account with limited permissions and without a passphrase on its private key Another solution is to run ssh-agent, which caches the keys before they are used, and you ll learn how to do this in the next section..

that do not understand binary data. In the early days of e-mail transmissions, not all mail servers would correctly handle binary files and so the encoding was necessary. Although the mechanism is no longer necessary for this specific reason, MIME has become the accepted standard and must therefore be used for sending binary data by e-mail. The standard has also been adopted in other circumstances, and related parts of the standard are used for other purposes, notably for identifying file types. As a result, the acronym does not automatically indicate any connection with e-mail when used in other contexts.

Figure 2-22. The actual execution plans generated from Listing 2-24

You can use ssh-agent to save yourself from constantly having to enter private keys. With this program, you can cache keys for a given shell environment. After starting ssh-agent from a shell prompt, you need to add the passphrase for the private key that belongs to it. This is something that you ll do for a specific shell, so, after you close that specific shell or load another shell, you ll need to add the passphrase to that shell again. After adding a passphrase to ssh-agent, the passphrase is stored in RAM, and only the user who added the key to RAM is able to read it from there. Also, ssh-agent listens only to ssh and scp commands that you ve started locally, so there s no way that you can access a key that is kept by ssh-agent over the network. So you can be sure that using ssh-agent is pretty secure. Apart from being secure, it s pretty easy as well. Enabling ssh-agent and adding a passphrase to it is a simple two-step procedure:

Viewing and understanding execution plans will help you learn how writing queries will affect the performance of your applications and reports. Don t rush to your database administrator demanding changes to the database indexes in your production database; this section doesn t intend to teach index tuning. Think of execution plans as another tool you can use to write better code. To learn more about how execution plans affect performance, complete Exercise 2-8.

1. From the shell prompt, use ssh-agent followed by the name of the shell you want to use it from. For example, use ssh-agent /bin/bash to activate ssh-agent for the Bash shell. 2. Now type ssh-add. You ll be prompted for the passphrase of your current private key, and you ll then see the message identity added, followed by the private key whose passphrase is added to ssh-agent.

The interface is shown in Listing 8-4 and is mostly concerned with the manipulation of MIME messages. However, it extends MailSender, so as a matter of convenience you can use a JavaMailSender implementation in any context where you need a MailSender implementation.

Secure Shell is a great way of accessing other hosts. But did you know that you can also use it to Tip

Exercise 2-8

public interface JavaMailSender extends MailSender { MimeMessage createMimeMessage(); MimeMessage createMimeMessage(InputStream contentStream) throws MailException; void send(MimeMessage mimeMessage) throws MailException; void send(MimeMessage[] mimeMessages) throws MailException; void send(MimeMessagePreparator mimeMessagePreparator) throws MailException; void send(MimeMessagePreparator[] mimeMessagePreparators) throws MailException; } All of the examples in this chapter use the JavaMailSenderImpl implementation of the JavaMailSender interface. Listing 8-5 shows the configuration of this bean in the application context configuration file.