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I’m currently working around the touch events of IE10 and even if I’m lucky enough to have a Windows 8 tablet, I was looking for a simpler way to do basic tests on my classical laptop without switching to the tablet each time. While looking for that, I’ve discovered several tips & tricks that may help you debugging the IE10 touch events in your code without even using a touch device. Nice side effect: the same approach will also help you to test & debug your responsive web design!
Pre-requisites: to follow this tutorial, you need first to:
1 – Download & install Windows 8 Release Preview on your machine: http://preview.windows.com
2 – Download & install Visual Studio 2012 RC Express for Windows 8: http://msdn.microsoft.com/en-us/windows/apps/br229516
The touch events model of Internet Explorer 10
If you don’t know yet how our touch implementation works, you should first read these 3 articles:
As a complement resource, you may have a look to the Pointer.JS library that mimics the IE10 model for the other browsers.
The Windows 8 Simulator to simulate touch
The Windows Simulator is installed with the development tools and is normally designed to help you testing & debugging your Metro Style Apps. You may learn a bit more details here: First look at Windows Simulator
Still, nothing prevents us to use it for debugging web applications running inside IE10 in the simulator. Let me show you how.
1 – Launch the simulator by launching the Microsoft.Windows.Simulator.exe located inside “Program Files (x86)\Common Files\Microsoft Shared\Windows Simulator\11.0”
And click on the desktop icon.
2 – Launch IE10, navigate to the “Internet Options” and “Advanced” tab. Check that both “Disable script debugging (Internet Explorer)” & “Disable script debugging (Other)” are not checked: Read the rest of this entry »
In the final article in this series, we move from content isolation and validation to an examination of how modern browsers protect your mashup’s users. By the end of this article, you’ll understand some of the safety measures that browsers provide against malicious input from mashup providers and see how a strategy that incorporates all the elements I’ve covered leads to a more secure mashup.
The Window into Your World
In the previous articles, I described building a mashup application for the fictional Contoso company. This mashup creates a world in which data from various locations interacts to create a sum greater than its parts. All the components run inside a Web browser window that users interact with to gain access to this world. These windows help protect users the same way that real windows protect us from the cold, UV light, theft, and other conditions. And just like with real windows, the level of protection you get depends on quality—in this case, the quality of your browser.
Let’s examine three protections that browsers offer to mashups that require very little or no interaction from users. This ambient protection doesn’t need a user to activate it. It’s ready when it’s needed.
Seeds in Your Heap
Imagine in our mashup application that the Physical Security department’s JSONP travel-alert data feed is compromised. The attacker who compromised the feed embedded a heap spray that will be delivered when the JSONP method is executed to return the JSON object. This attack vector could spell disaster for your users if their browser is not protecting them. Read the rest of this entry »
Working with CSS in Web documents, we often find ourselves using the fundamental screen unit, the pixel—a square, nondivisible part of every display device (well, visual screens anyway) that distributes little sources of light in a regular, perpendicular grid.Because the majority of Web developers’ work focuses on creating pixel-perfect manifestations of designs delivered in pixel-based, noninteractive image formats, we tend to forget that the Web offers more than just pixel values for expressing lengths and sizes with CSS. This knowledge is fundamental for dealing with responsive Web design, where understanding how CSS length units work is crucial to correctly assigning sizes to objects and aligning elements on the page.
In this article, I’ll look at these units of measure and describe how they behave and apply to elements in documents. (Keep in mind that a fair bit of book typesetting is done in CSS as well, so it’s not just HTML documents we’re dealing with.)
Relative vs. Absolute Units
In terms of measurement, every length is expressed in relation to some basic unit. All measurement systems provide a standard set of units with which to compare and calibrate all other units and measurement devices.
Units (as far as CSS goes) can be absolute or relative, depending on whether their basic unit depends on the context within which it’s used. For computer displays, the basic unit is the pixel, to which all other units are recalculated when objects are finally rendered to the screen. Although the pixel is treated as a relative unit, it is nevertheless dependent on two parameters: the screen’s physical size and its resolution. I’ll cover how pixels relate to physical units later in the article.
Other units, such as percentages (denoted by the % symbol), are dependent on the context of their use. They can express a proportion of a container’s width or height or a proportion of the current font size or line height.
First, let’s cover absolute CSS units. Read the rest of this entry »
In the first article in this series, I covered cross-origin resource sharing (CORS) and building iframe sandboxes and described how to use these techniques in mashup applications to consume data from other domains and provide a layer to a defense-in-depth strategy. In this article, I’ll start exploring how to consume data from CORS connections (or any Ajax connection) by defining a level of trust and then sanitizing accordingly. To do this, I’ll build on top of the guidance provided by Project Silk. First, let’s discuss trust and how mashup applications in the enterprise provide a unique challenge to the existing paradigm.
Trust or the Lack Thereof
In Writing Secure Code, the authors put forth an excellent mantra: “All input is evil.” In the world of enterprise mashup applications, this is true, but some input is more evil than others. As an example, does a data feed from your company’s human resources system pose the same threat as a data feed from Twitter? Another common expression about software security is “all external systems pose a threat.” Again, this is true, but security is about risk management, which needs to stay a central focus in your mashup development process. Risk is a combination of the impact of a threat (a threat is an exploitation of a vulnerability in the system) and its probability of execution. The types of threats that a HR data feed present probably have a lower impact than threats that could be realized by consuming a Twitter feed. A Twitter feed can be any text content provided by any user, while the HR feed would be a structured set of data points provided and verified by members of the HR department. This gives the HR system a lower risk (assuming the probability of execution is lower or equal to Twitter). When considering the trust of systems, extend your vision of input to include the content coming from your mashup providers and also weigh trust for internal vs. external providers.
Here are some questions to consider when building your input validation for mashup providers:
- What is your organization’s culture toward risk? Are you risk adverse or less concerned about risk when functionality is at stake?
- What is the history of the provider? As an example, if you know that an internal provider has had malicious code posted to its site by disgruntled employees, you would obviously want to keep an eye on this provider.
- What kind of data are you receiving from the provider? Take Twitter vs. Bing Maps, for example. The type of content coming from Bing Maps is different from the content coming from Twitter (depending on the API). How does that impact your trust of the provider?
- Does the data cross a trust boundary in your threat model?
Mashup Data = Input
Overall, your goal is to securely consume data from various sources, some trusted and others not as trusted. “Data from various sources” is a long way of saying “input,” which means you need to consider the three elements of input validation: constrain, reject and sanitize. Constraining input is not only limiting what is permitted. It also means reducing the possible entry points into the system. (In information security, we call this “reducing the attack surface.”) You need an input chokepoint through which all consumed data must pass. Fortunately, the nice folks at Microsoft patterns & practices have provided a great design to do just that with the Data Manager in Project Silk. Read the rest of this entry »
One of the most stubbornly persistent misconceptions about HTML5 is that it’s effectively unusable for years to come. With that myth and the uncertainty over fragmented browser support for HTML5’s new features, it’s easy to find someone with reasons for avoiding HTML5 right now.
But while some features are legitimately not ready for use in production, many of the new APIs in HTML5 have solidified enough to be relied on in newer browsers like Chrome, Firefox 4 and Internet
Explorer 9. In fact, even Internet Explorer 6 includes support for one of HTML5’s “new” features, contentEditable. More importantly, many of the new features in HTML5 are compelling enough that waiting another decade to begin using them doesn’t make sense.
The most nagging issue with making the leap to HTML5 is that most of us have no choice but to support a variety of older browsers that have little or no support for the most useful new APIs. The thought of adopting a new Web technology conjures up nightmares of cross-browser inconsistencies, unmaintainable branching code, browser sniffing and a host of other problems. However, there’s an underappreciated technique that can entirely mitigate those problems for certain new features of HTML5 and still allow you to develop against the new APIs as though all your users had upgraded their browsers overnight: polyfills.
Polyfilling is a term coined by Remy Sharp to describe an approach for backfilling missing functionality in a way that duplicates the missing API. Using this technique allows you to write application-specific code without worrying about whether or not each user’s browser implements it natively. In fact, polyfills aren’t a new technique or tied to HTML5. We’ve been using polyfills such as json2.js, ie7-js, and the various fallbacks for providing transparent PNG support in Internet Explorer for years. The difference is the proliferation of HTML5 polyfills in the last year. Read the rest of this entry »
Beyond the buzz of Web 2.0, mashup applications (also called hybrid or situational applications) bring the promise of creating meaningful experiences by feeding other people’s data to your application. For businesses, this means consuming data without the overhead of infrastructure or data storage and being able to tap into established technology vendors such as Bing Maps, LinkedIn or Twitter. While combining components from all over the web can help you quickly build a powerful application, it can also expose your users to malicious content that sneaks into your application from your providers. How can you protect your users and still realize the potential of mashup applications for the enterprise?
In this series, I’ll investigate how to mitigate security issues that can come along with a mashup application. To frame the discussion, we’ll build an application for the fictional Vision Sciences Corporation, leveraging risk management, good-old input validation and the muscle of modern browsers to keep users safe. Each article will focus on one of these elements, starting in this article, where I’ll examine how modern browsers help isolate content. At the end of this article, you’ll understand how the browser is the first layer in your defense-in-depth strategy against malicious mashup madness.
What Are We Building?
I always find a sample project helpful to illustrate development issues. Talking about the sample lets me dive into a narrative, not just detached code. So to start, imagine the following scenario:
You are a developer at Vision Science Corporation, and your product team has requested that you build an HTML5 application for the company’s office locations around the world that shows news about health and safety risks combined with medical information distilled from Twitter.
Being a savvy developer, you know that you can get this data from a variety of sources in your organization and through external providers like Bing Maps and Twitter. Here is a breakdown of the data sources and systems for the application: Read the rest of this entry »
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