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Is there any built-in support for validating malicious input within the Web API, similar to forms with MVC?
If not, could anyone suggest a "global" filter/message inpector/whatever to validate against malicious input? I'm trying to avoid validating all of my models/parameters individually...
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Parameters in a REST API may be saved which means they are returned from subsequent requests or the results may be reflected back to the user in the request. This means that you can get both reflected and stored XSS attacks. You also need to be careful about DOM Based XSS attacks.
In this article Cross-Site Scripting (XSS) is a security vulnerability which enables an attacker to place client side scripts (usually JavaScript) into web pages.
XSS occurs when a web application makes use of unvalidated or unencoded user input within the output it generates. Some ASP.NET web applications that use the Control. ResolveUrl method to resolve app-root-relative paths are vulnerable to XSS.
XSS occurs when a user-manipulatable value is displayed on a web page without escaping it, allowing someone to inject Javascript or HTML into the page. Calls to Hash#to_json can be used to trigger XSS.
No, I don't believe there is such support. Here's why. The input validation support with Web Forms/MVC was a stopgap measure. But encoding output is the better XSS fix; validating input doesn't work perfectly, as what input is "bad" depends on how you'll be outputting it (as part of HTML element source, as part of JS source, in an HTML attribute value, as part of a SQL query, etc.).
So I'd recommend against generic, global input validation as the solution to XSS concerns. Instead, make sure you're always encoding input correctly before outputting it (or passing it on to another layer, such as a SQL DB). For output, if you're using the normal Web API mechanisms for returning data (model classes with content negotiation/formatters), the formatters should handle the content type-specific encoding for you.
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