When the World Wide Web started, it was just a bunch of static HTML pages which are interconnected by hyperlinks. More importantly, each website had content which was loaded from its own server (technically speaking, no cross origin content). Today, the web we browse daily has content which originates from various origins. People use several buzzwords such as "Mashups", "Web 2.0", "Social Web" etc. while referring to the present day's dyanmic web.
By definition, paradoxes are arguments which give rise to inconsistencies. e.g., answer this seemingly simple question with Yes/No:- Is the answer to this question "No"?
Irrespective of what you answer is, you will see that you are contradicting yourself.
If you closely observe, most of the problems on the web are paradoxes. Whether you judge the below factors as safe/unsafe, you will be contradicting yourself :-)
Paradox 1: Content inclusions
"_ _ _, third party scripts are not safe" [Fill in the blank with "Yes"/"No"]
Do we have a robust solution for safe content inclusions? Well, after several proposals such as input sanitization, automatic analysis of content, Content Security Policy has gained acceptance. Yet, the 'trust' factor is still present.
Paradox 2: Content requests
Even before third party content is included, technically speaking, a HTTP request is what happens before. A request, even without a valid response, is just sufficient to do both good and bad. HTML elements such as <img>, <script>, <iframe>, <form> etc which have src/href/action attributes take any URL and trigger a HTTP request. Note that these requests are not restricted to same origin (otherwise, we will not be able to see images.google.com loading images from multiple websites). However, as we know, there could be malicious cross origin requests as well (Hello CSRF!) and browsers do not have any way of differentiating between the two.
Do we have any way of differentiating between safe/unsafe requests? Should we block all cross origin requests with cookies? Breaks almost entire Web. Should we block cross origin requests with parameters? API's will not work. Should we block cross origin POST? Paypal/Like/Tweet/OpenId workflows will not work. Should we use HTTP headers, tokens to differentiate? Many use today, but this is not robust. The scenario turns complex even without discussing techniques such as JSONP, HTML5 CORS and complex access control policies. So the below paradox holds good here as well.
"_ _ _, one cannot differentiate between genuine and malicious cross origin requests" [Fill in the blank with "Yes"/"No"]
Paradox 3: Social plugins
This case is even more problematic. Technically speaking, social plugins (such as Facebook "Like", Twitter's "Tweet", Google's "+1" etc) are third party content embeded in <iframe> tags. Framing third party content in iframes is an important step towards security. If the third party content is not framed, it has complete access to DOM, storage, network of a website, which is dangerous. Content in cross origin iframes cannot access the content of parent web pages due to Same Origin Policy restrictions. However, framing content leads to another dangerous attack called "Clickjacking". Though clickjacking has defenses such as X-Frame-Options, Frame busting etc, they cannot be applied to social plugins, as they defeat the whole purpose of wrapping third party content in iframes. A more detailed explanation of this problem is stated in one of my previous posts.
"_ _ _, social plugins cannot exist without iframes" [Fill in the blank with "Yes"/"No"]
Paradox 4: Sandbox Iframes [HTML5]
"Sandboxed iframes do not allow scripts. Yes or No?". Implies, sandbox breaks clickjacking.
Conclusion? The web is not short of contradictions. We have more hacks than solutions and several solutions contradict themselves, as seen above. The bigger problem today is not solving several of these well known problems, but solving them effectively, without breaking millions of websites. More about some of the interesting proposals to solve these problems in my upcoming posts.
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