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POJava website protection solutions (especially XSS)
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copied!<p>I'm developing a web application, and facing some security problems.</p> <p>In my app users can send messages and see other's (a bulletin board like app). I'm validating all the form fields that users can send to my app.</p> <p>There are some very easy fields, like "nick name", that can be 6-10 alpabetical characters, or message sending time, which is sended to the users as a string, and then (when users ask for messages, that are "younger" or "older" than a date) I parse this with SimpleDateFormat (I'm developing in java, but my question is not related to only java).</p> <p>The big problem is the message field. I can't restrict it to only alphabetical characters (upper or lowercase), because I have to deal with some often use characters like ",',/,{,} etc... (users would not be satisfied if the system didn't allow them to use these stuff)</p> <p>According to this <a href="http://ha.ckers.org/xss.html" rel="nofollow noreferrer">http://ha.ckers.org/xss.html</a>, there are a lot of ways people can "hack" my site. But I'm wondering, is there any way I can do to prevent that? Not all, because there is no 100% protection, but I'd like a solution that can protect my site.</p> <p>I'm using servlets on the server side, and jQuery, on the client side. My app is "full" AJAX, so users open 1 JSP, then all the data is downloaded and rendered by jQuery using JSON. (yeah, I know it's not "users-without-javascript" friendly, but it's 2010, right? :-) ) I know front end validation is not enough. I'd like to use 3 layer validation: - 1. front end, javascript validate the data, then send to the server - 2. server side, the same validation, if there is anything, that shouldn't be there (because of client side javascript), I BAN the user - 3. if there is anything that I wasn't able to catch earlier, the rendering process handle and render appropriately</p> <p>Is there any "out of the box" solution, especially for java? Or other solution that I can use?</p>

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