![]() ![]() ![]() In this tutorial, you’ll review the different protections the CSP header offers by implementing one in an example Node.js application. Any code that is not from the approved sources, will be blocked from executing, which makes it considerably more difficult for an attacker to inject content and siphon data. ![]() ![]() With the CSP header, you can specify approved sources for content on your site that the browser can load. It also reports any policy violations to a URL of your choice, so that you can keep abreast of potential security attacks. It facilitates the creation of an “allowlist” of trusted content and blocks the execution of code from sources not present in the allowlist. These situations are where a Content Security Policy (CSP) can provide protection.Ī CSP is an HTTP header that provides an extra layer of security against code-injection attacks, such as cross-site scripting (XSS), clickjacking, and other similar exploits. Attackers use this exploit to maliciously inject scripts to the page, which are then executed because the browser has no way of determining if the content is harmful. By default, the browser does not distinguish between the two and executes any code requested by a page regardless of the source. The code could be from the same origin as the root document, or a different origin. When the browser loads a page, it executes a lot of code to render the content. The author selected the Free Software Foundation to receive a donation as part of the Write for DOnations program. ![]()
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