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Instant messaging is very quickly becoming one of the cornerstones of modern communication, or at the very least, it is making great strides and doesn t show any signs of slowing down.
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C HAPTE R 13 SERV ER S ECURITY
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With its heavy presence in the modern workplace, it has become common for business-related communications to be sent over IM. Because of its humble consumer upbringings, these communications are often not encrypted at all. Many modern packet sniffers have plug-ins or filters specifically designed for tracking session data such as connection passwords and chat transcripts. Because of IM s prevalence and its potential for eavesdropping, securing your IM communication by way of an encrypted chat server should be a top priority. The Leopard iChat Server uses the XMPP protocol with an available option to enable SSL. You can use the default SSL certificate created when your Mac OS X Server was first configured, or you can choose to import your own. If you opt not to purchase a SSL certificate from one of the public CAs, make sure to generate your own certificates for distribution to your clients, as covered in the previous section on SSL. Customizing the welcome message to new users of your iChat Server is a fairly simple task, and from a security context it allows an administrator to push out an acceptable use policy for their iChat environment. For this, we ll cover the Jabber configuration because Jabber is the open source package on which iChat Server is built. When you first set up Jabber, the /etc/jabber directory will be created. Inside this folder is a file called jabber.xml. Open the jabber.xml file, and look for the welcome tag. Then, any data between "welcome" and "/welcome" will be the information that is shown in a welcome screen when a new user signs onto the iChat Server.
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Tip Before you edit the /etc/jaber/jabber.xml file, make sure to back it up.
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For this example, we will have all new users receive a message that says Welcome to the 318 iChat Server. To do this, delete or comment out the information between the existing welcome tags, and add the following information: "welcome" "subject"to our iChat Server"/subject" "body "Welcome to the 318 iChat Server"/body" "/welcome" Save the jabber.xml file, and you ve now customized the welcome message for your iChat Server.
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Note For the purpose of this chapter, the < and > have been replaced with quotes ("). However, you will
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need to use the < and > in your environment while using the jabber.xml file.
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Securing the Mail Server
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The mail server in Mac OS X Server has a few settings designed specifically for security. In 5 we discussed using the SpamAssassin and ClamAV features to limit mail that SpamAssassin and ClamAV identify as potentially sent from a spammer or system that has been infected with viruses. But what if your server is hijacked and set up as an open relay used
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CHAPTER 13 S ERVER S EC URIT Y
to send spam An open relay is a server that allows any user to relay mail through it. To verify your system isn t being used as an open relay, follow these steps: 1. Open Server Admin. 2. Click Mail. 3. Click Settings. 4. Click the Relay tab. 5. Remove servers not in your local network from the Accept SMTP Relays from These Hosts and Networks box.
Limiting the Protocols on Your Server
To reduce the footprint of mail services, you should also limit the number of protocols in use on your server. To do so, click the Settings tab for the Mail service in Server Admin, and verify you are using only the services you need (see Figure 13-27). For example, many environments will use only POP or IMAP. If you aren t using one of the two protocols, then disable the other (for a more in-depth discussion of POP, IMAP, or SMTP, see 5).
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