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Tightening Security with SSL
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Secure Sockets Layer (SSL) began appearing on commerce servers on the Web in the mid-tolate 90s as a means to securely submit confidential financial data over the Web. This high-level open source security protocol is now an industry standard and has recently been expanded for use with various mail protocols, instant messaging protocols, and web sites. SSL is based on RSA Data Security s public-key cryptography algorithms and is denoted by the letter S in the
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CHAPTER 11 WEB S IT E S ECU RIT Y
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https part of a web site s URL. By default, SSL operates over port 443, although this can be customized. OpenSSL is the package that provides the SSL service for Mac OS X and Mac OS X Server. The current version of OpenSSL that is running on a system can be found by using the interactive command-line OpenSSL tool. To do this, use the following command: openssl version The openssl command then responds with an output equaling the following, showing the exact version of OpenSSL being run on the system: OpenSSL 0.9.7l 28 Sep 2006 OpenSSL uses a shared key that is stored in the form of an X.509 certificate to encrypt communication between servers and clients.
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Implementing Digital Certificates
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Data that is transported back and forth from the web server to the web browser needs to be secured. All too often, this data is sent across the Internet unencrypted and exposed to anyone who has the ability to intercept it. Digital certificates such as SSL and TSL certificates were invented to cut down on this kind of information hijacking. When a digital certificate is used, an encrypted handshake is initiated with the server and browser. These certificates can be created using open source tools such as OpenSSL, or they can be purchased from companies such as VeriSign or Thawte, which offer many different configuration options for the certificate. There are two ways to implement certificates. The first, and the least expensive route, is to use a self-assigned certificate. This option uses the built-in SSL feature of your server to create the certificate (more on this in 13). The second option is to purchase one from a trusted authority such as Thawte or VeriSign. The key difference to using the prebuilt SSL is whether the web site administrator will want to force the end user of a site to click the OK button when their traffic goes from HTTP-based traffic to HTTPS-based traffic. Implementing a third-party SSL certificate will enforce that procedure and make the acceptance of the certificate more streamlined for your visitors. When considering whether to use SSL to protect your web site, it is important to consider whether you will have users interacting with web sites in such a way that they want their privacy to be protected. For example, if you have a very small web site that only provides data for users but does not have any forms or ways for users to actually enter data into your site, then you probably do not need SSL implemented on the web server. The certificate and infrastructure that is required for the use of SSL would simply not be worth the expense.
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Protecting the Privacy of Your Information
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It is important to protect your privacy. If you were interested in finding out who owns a site, you could perform a WHOIS lookup for the domain to find out more information about the
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site, including the name, phone number, physical address, e-mail address, and DNS servers of the domain, which could then be used for social engineering purposes. Many domain registrars, such as Network Solutions, even provide information about domain names by using a WHOIS button on their front pages. But it s not just Network Solutions that will provide this information; almost every domain registration web site will give the inquisitor access to a WHOIS database to look up information about a site. The WHOIS database is even accessible via the Network Utility in Mac OS X (see Figure 11-3).
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Figure 11-3. Network Utility Lookup tab Once you know the IP address of a server, it is also possible to query ARIN within the Network Utility to discover more information about the owner of the web site (see Figure 11-4). Established in December 1997, ARIN is a nonprofit that allocates IP addresses and develops policies used to govern how they are used. So, how can you protect your web site from displaying this information To protect this sensitive information, many registrars offer an add-on service that allows you to hide your information from others, thus repelling a variety of spam and the discovery of other information.
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