![]() We also insert a function called indexToLiteral in the AST of the script. In the src/ directory, we create a file called SimpleFingerprintCollector.js.Ĭlass SimpleFingerprintCollector )) We use a simple fingerprinting script with few attributes so that it is easier to understand. Nevertheless, one should be careful when using obfuscation since it is not perfect with enough time and effort, attackers can often understand Thus, attackers can look at the content of the script, hence the need for obfuscation. Indeed, since JavaScript is executed in the browser, it needs to be sent to the user’s machine to be executed. ![]() So that attackers can’t too easily understand the different attributes collected. In the case fingerprinting is used in a security context, companies often tend to obfuscate the content of their script Note: a key strength of SpamSpan is that it uses JavaScript. In this post, we’ll only focus on the JavaScript part of fingerprinting.īrowser fingerprinting can be used both for tracking as a way to regenerate cookies or for security,Īs a mechanism to detect bots and crawlers, as well as to enhance authentication. Now what this module here does is obfuscate email addresses so that spambots cant collect them. To collect these attributes, we can leverage the HTTP headers sent by the browser as well as JavaScript APIs. Nevertheless, I provide a brief explanation of what’s browser fingerprinting.īrowser fingerprinting is a technique that collects a set of attributes related to the user device and browser. No knowledge of browser fingerprinting is required to understand the remainder of this post. To better understand the obfuscation transformations, we use a short browser fingerprinting script as an example on this blog post. Nevertheless, if you’re just interested in the obfuscation part, you can skip the next section. In this blog post, I try to provide a complete working example. Drupal Email Obfuscator Module is used to search everywhere and obfuscate all emails within Drupal using a Middleware. Transpiled or obfuscated versions of these files.įinally, the test/ directory will contain files used to test if our code still works after obfuscation. For selecting the font family, you need to upload the font and click Save firstĪnd then only the font will appear in the font list.The src/ directory will contain the source of the JavaScript files we write, while the dist/ directory will contain.But with a bit of JavaScript, you can quite easily hide it. HTML code for adding a clickable email address is as follows: Your Name Since the address is exposed, it’s extremely easy for bots to find and save it.Install the module and go to configuration page and select the fields in which Obfuscating emails with JavaScript requires adding a simple code to your website.If support for non Javascript browser is enabled, GD library is a must which will usually be installed on server.Select the field types you need to be processed: admin/config/content/spamfree_email.If non Js browser support is needed Gd library should be enabled, which will be on in most cases. Should work on any Drupal 7 installation. ![]() Var eWNnEZVIu = new = eWNnEZVIu+eWNnEZVIu+eWNnEZVIu ĭocument.getElementById('YvynIpoMZ').href = 'mailto:'+eWNnEZVIu+eWNnEZVIu+eWNnEZVIu Īdditional feature to handle non JS environment, can be turned off from admin side. WorkingĪfter obfuscation, this email address: turns into this, but only for bots: Spamfree Email does not use any common css class names or ids making it further difficult for the bots to grab the text within that. Every time the email generated javascript array will change making it difficult for the bots to do any guess work. This prevents non-javascript capable bots from harvesting email addresses. A javascript array of the original email address is generated and is parsed back to HTML, this way it is shown in Javascript-enabled browser, at the same time for non JS browsers an image of the email address (using Gd library) is generated and displayed. The Email address given in content type fields like (body, summary etc,) are converted into corresponding mailto links and provides email obfuscation to protect email addresses from harvesting bots. Spamfree Email module works on Javascript enabled and disabled browsers preventing email harvesting.
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