A rewritten version of flavorQuery avoids injection attacks by using XPath variables in Java

Drawer Code 39 in Java A rewritten version of flavorQuery avoids injection attacks by using XPath variables
Example 107 A rewritten version of flavorQuery avoids injection attacks by using XPath variables
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public String flavorQuery(String id, String name, String xmlFile) throws XPathExpressionException { XPathFactory xfac = XPathFactorynewInstance(); XPath xp = xfacnewXPath(); InputSource input = new InputSource(xmlFile); XPathBindVariables bv = new XPathBindVariables(); xpsetXPathVariableResolver(bv); bvbindVar("ID", id); bvbindVar("NAME", name); String query = "//orders/order[@id=$ID and @name=$NAME]"; xpevaluate(query, input); return xpevaluate(query, input); }
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10 XML and Web Services
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Now there is no need to trust (or to validate) the values of id and name Regardless of the values, the query will carry out the expected logic
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102 Using Web Services
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The most cynical among the software security crowd see Web Services as nothing more than a way to bypass the restrictions rewalls impose In the bad old days, administrators could use a rewall to regulate network applications by controlling which ports were open to the outside world This worked because most applications communicated on different ports (Firewall rules could specify that inbound SMTP is okay, but no Telnet, and certainly no speaking the Network File System (NFS) protocol with the Internet at large) Because all Web Services traf c can easily ow over port 80, there is no need to go talk to the network administrator to introduce a new application We stop short of accusing anyone of harboring ulterior motives, but it is certainly true that uttering Web Services is the tersest verbiage one might use to explain why installing a rewall is an insuf cient security plan Proponents of Web Services are certainly aware that security is a concern, but they often fall into the trap of equating security features with secure features In this vein, a favorite excuse for an otherwise insecure Web Services implementation is the use of the WS-* family of standards, which were created to address security features such as authentication, authorization, encryption, and digital signatures Specialized software (and hardware) exists to broker Web Services transactions to make all these details easy for the application developer Of course, even if all the security features are done right, there is still plenty of room for security mishaps in the form of defects and surprises buried in the code that has been Web Service enabled In keeping with the theme of the book, we do not discuss Web Services security features Instead, we focus on all the security problems that occur in the code that isn t focused on security Input Validation Web Services frameworks try to make it as easy as possible to push a button and get a Web Service Here s how the Apache Axis project describes getting started in creating a SOAP-enabled Web Service [Axis, 2007]
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102 Using Web Services
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Let s say we have a simple class like the following:
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public class Calculator { public int add(int i1, int i2) { return i1 + i2; } public int subtract(int i1, int i2) { return i1 - i2; } }
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How do we go about making this class available via SOAP There are a couple of answers to that question, but we begin with the easiest way Axis provides to do this, which takes almost no effort at all! JWS (Java Web Service) Files Instant Deployment OK, here s step 1: copy the above java le into your webapp directory, and rename it Calculatorjws So you might do something like this:
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% copy Calculatorjava <your-webapp-root>/axis/Calculatorjws
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Now for step 2 Wait a minute, you re done! You should now be able to access the service at the following URL (assuming your Axis web application is on port 8080): http://localhost:8080/axis/Calculatorjws
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So it s easy to expose methods that might have previously been the guts of the application But if those guts contain vulnerabilities that were previously mitigated by the outer layer of code, the system is now vulnerable Consider Example 108 It s a method taken from DionySOA, a project that advertises itself as a Reseller/Broker service platform built using SOA and Web Services The method is exposed through a Web Service (You get a hint that it might be externally accessible when you see that it throws javarmiRemoteException Knowing for sure requires looking at the application s configuration files) The method contains a blatant SQL injection vulnerability It concatenates a user-controlled parameter into a SQL query string and executes the query Although it is possible to make this kind of mistake without any Web Services in sight, we can t help but believe that the Web Services setup made it easier to forget about
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