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Protecting confidential data
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correct password for that user from its database, append the random term, encrypt it, and compare the results. If they match, it lets us in. If they don t (say we mistype our password), it presents the login form again, but with a different random string this time. Let s say that the server transmits the string abcd . The MD5 digest of Ajax in actionabcd is e992dc25b473842023f06a61f03f3787. On the next request, it transmits the string wxyz , for which we generate a completely different digest, 3f2da3b3ee2795806793c56bf00a8b94. A malicious entity can see each random string, and match them to the encrypted hashes, but has no way of deducing the password from these pairs of data. So, unless it gets lucky enough to be snooping a message whose random string it has seen before, it will be unable to hijack the login request. The random string is the public key. It is visible to all, and disposable. Our password is the private key. It is long-lived, and is never made visible. A JavaScript implementation Implementing this solution requires an MD5 generator at both the client and the server. On the client, Paul Johnston has written a freely available generator library in JavaScript (see the Resources section). Using his code is just a matter of including the library and invoking a simple function:
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<script type='text/javascript' src='md5.js'></script> <script type='text/javascript'> var encrypted=str_md5('Ajax in action'); //now do something with it... </script>
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On the server tier, MD5 algorithms are available for most popular languages. PHP has had a built-in md5() function since version 3. The java.security.MessageDigest class provides a base implementation for Java encryption algorithms and implementations of a number of common algorithms, including MD5. The .NET Framework provides a System.Security.Cryptography.MD5 class. This technique has limited usefulness, since the server must already know the data being encrypted in order to facilitate a comparison. It is ideal as a means of providing secure login capabilities without recourse to HTTPS, although it can t substitute for HTTPS as an all-around secure transmission system. Let s review where are now. The server of origin policy is safeguarding our users computers from malicious code. Data exchanged between the client and the server is protected from man-in-the-middle attacks by HTTPS. In the final section, let s look at a third point of attack, the server itself. You ll learn how to secure your own web services from unwanted visitors.
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Security and Ajax
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7.4 Policing access to Ajax data streams
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Let s begin by reviewing the standard Ajax architecture, in order to identify the vulnerability that we ll discuss in this section. The client, once it is running in the user s browser, makes requests to the server using HTTP. These requests are serviced by web server processes (servlets, dynamic pages, or whatever) that return streams of data to the client, which it parses. Figure 7.8 summarizes the situation. The web services or pages are accessible by external entities, without any additional work on our part that s just how the Internet works. It may be that we encourage outsiders to use our web services in this way, and we may even publish an API, as eBay, Amazon, and Google, among others, have done. Even in this case, though, we need to keep security in mind. There are two things we can do, which we discuss in the following two sections. First, we can design our web services interface, or API, in such a way that external entities cannot subvert the purpose of our web application say, by ordering goods without paying for them. Second, we look at techniques to restrict access to the web services to particular parties.
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7.4.1 Designing a secure web tier
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When we design a web application, we typically have an end-to-end workflow in mind. In a shopping site, for example, the users will browse the store, adding items to their baskets, and then proceed to checkout. The checkout process itself will
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