With the popularity of the Internet and the diversification of applications, the security of websites has become the focus of attention. Nginx, an efficient and flexible web server and reverse proxy server, also serves as an important component to ensure website security. This article will focus on HTTP access control and common security vulnerabilities in Nginx.

1. HTTP access control

1. Reverse proxy

In actual operations, we often find that some requirements require the use of reverse proxy for access control. Nginx's reverse proxy is a powerful and flexible function that can transmit data between the internal network and the public network.

For example, when a company needs to access an external website, access control can be performed through Nginx, and only IPs within the company are allowed to access the website. This method can effectively eliminate attacks from the public network and enhance website security.

2. Authentication and authorization

Nginx also supports HTTP basic authentication and digest authentication. HTTP basic authentication ensures that only authorized users can access target resources by setting a username and password. HTTP digest authentication uses a digest algorithm to encrypt the password, making it more secure and reliable.

For example, we can add the following code to the Nginx configuration file to implement basic authentication:

location /private {
    auth_basic           "closed site";
    auth_basic_user_file conf/users;
}

where conf/users specifies the user's authentication information and password. This way, only users who can provide the correct username and password can access the /private path.

3.IP access control

Nginx also provides corresponding control mechanisms for access from specific IPs. For example, you can limit access to only IP addresses within the company's intranet.

For example, we can add the following code to the Nginx configuration file to implement IP access control:

location /private {
    deny all;
    allow 192.168.1.0/24;
    allow 10.0.0.0/8;
    allow 172.16.0.0/12;
    allow 127.0.0.1;
    allow ::1;
    deny all;
}

Here, the access rights are limited to the IP range of the company's internal network, that is, 10.0.0.0 /8, 172.16.0.0/12 and 192.168.1.0/24, while allowing access from the trusted IP addresses 127.0.0.1 and ::1.

2. Common security vulnerabilities

1. Improper configuration

Improper configuration is one of the common causes of web server security vulnerabilities. The Nginx server does not fix all security vulnerabilities by default. If sufficient security measures are not taken in the configuration file, an attacker may obtain server permissions from malicious requests and then take control of the entire server.

2. SQL injection

SQL injection is also a common web security vulnerability. The attacker injects SQL code into the parameters and passes malicious statements to the database to gain illegal access.

In order to prevent security vulnerabilities such as SQL injection, user input can be checked through regular expressions to filter malicious code. At the same time, using a Web Application Firewall (WAF) is also a more effective preventive measure.

3. XSS Vulnerability

Cross-site scripting attack (XSS) is a security vulnerability that causes network attacks by submitting illegal code. By injecting specific HTML and JavaScript code into web forms, attackers can completely control the target website to steal users' private data or perform other illegal activities.

The method to prevent XSS vulnerabilities is very simple. You only need to restrict user input in web forms and use secure encoding technology in the returned HTML page.

4. CSRF attack

CSRF (Cross-Site Request Forgery) cross-site request forgery attack is a type of attack that uses malicious code to falsely request a website to conceal the identity of the attacker. The security mechanism of the target website, resulting in an attack method that leads to security vulnerabilities.

Generally speaking, to prevent CSRF attacks, you can add a random token to the web form to ensure that the request comes from the user himself.

Summary

In order to ensure the security of the Nginx server, we must not only manage HTTP access control, but also pay attention to the prevention of common Web security vulnerabilities. Among them, improper configuration, SQL injection, XSS attacks and CSRF attacks are relatively common security issues. When developing, testing, and publishing web applications, be sure to take necessary security measures to protect the web server from always working in a safe state.

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