Author: Zen and the Art of Computer Programming
1 Introduction
Security is an important aspect that all web developers need to pay attention to, because there are various hidden dangers when information is transmitted over the Internet. Attackers take advantage of these vulnerabilities to cause damage to our website and even cause the server to be compromised. Therefore, during the web development process, we need to remain vigilant about security issues and take necessary measures to ensure the security of our websites and applications.
This article starts from the perspective of front-end security and leads readers to understand common web attacks, attack methods, defense methods and other knowledge. The article focuses on the key principles and six elements of front-end security protection, such as cross-site request forgery (CSRF), incomplete input validation (Input Validation), clickjacking (Clickjacking), XSS cross-site scripting attack, SQL injection, session Manage security, etc. Through practical cases, analysis tools, and technical solutions, the author summarizes the protection mechanisms and strategies for these security vulnerabilities in detail. We hope to provide readers with more systematic and comprehensive knowledge.
2. Explanation of basic concepts and terms
First, let’s introduce some basic concepts and terminology of front-end security:
CSRF (Cross-site request forgery) cross-site request forgery
CSRF is a well-known web security vulnerability. This vulnerability occurs when a trusted user performs certain operations, using a web page to embed a request link or image from a malicious third-party website, and uses the victim user's cookie to perform illegal operations.
solution:
- Check the request address: Determine whether it is a legal request based on the request address. For example, check whether the request address points to the page or API under the domain name of this website;
- Add verification code: When submitting the form, add a verification code. Only when the verification code is entered correctly can the form be submitted. Verification code