How to configure Nginx cross-domain access and anti-leeching-Nginx-php.cn

How to configure Nginx cross-domain access and anti-leeching

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Release： 2023-05-13 18:31:12

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Cross-domain access control

Cross-domain access

How to configure Nginx cross-domain access and anti-leeching

##Why does the browser prohibit cross-domain access

Not safe, prone to CSRF attacks!

How to configure Nginx cross-domain access and anti-leeching

If website b controlled by a hacker adds malicious information in the response header to allow the client to access website a, a csrf attack will occur

How nginx configures cross-domain access

add_header syntax

syntax:add_header name value [always];
default:—
context:http, server, location, if in location

Syntax explanation:

add_header name value [always];
name represents the key returned by the response header
value represents the response header The value corresponding to the returned key
add_header cross-domain configuration

location ~ .*\.(htm|html)$ {
  add_header access-control-allow-origin *;
  add_header access-control-allow-methods get,post,put,delete,options;
  root /opt/app/code;
}

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Anti-hotlinking

Anti-hotlinking purpose

#Prevent resources from being misappropriated.
Prevent abnormal user access, occupy website resources, affect website performance, and will inevitably affect normal user access

Based on http_referer anti-hotlinking Configuration module

ngx_http_referer_module module is used to prevent requests with invalid values in the "referer" header field from accessing the site.

Example

valid_referers none blocked server_names
 
        *.example.com example.* www.example.org/galleries/
 
        ~\.google\.;
 
if ($invalid_referer) {
 
  return 403;
 
}

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referer_hash_bucket_size syntax

referer_hash_bucket_size size; indicates that the setting is valid The storage size of the reference hash table.

referer_hash_max_size Syntax

referer_hash_max_size size; means setting the maximum size of the effective referrer hash table .

valid_referers syntax

## Syntax explanation:

valid_referers none | blocked | server_names | string ...;

none indicates that the "referer" field is missing in the request header;
blocked means that the "referer" field appears in the request header, but its value has been removed by the firewall or proxy server; these values are strings that do not begin with "http://" or "https://";
server_names means the "referer" request header field contains a server name;
string means defining the server name and optional uri prefix. The server name can contain "*" at the beginning or end. The server port in the "referer" field was ignored during the check;

touch test_referer.html (In the /op/app/code directory)

<html>
<head>
  <meta charset="utf-8">
  <title>imooc1</title>
</head>
<body style="background-color:red;"><br data-filtered="filtered">　　 <h1>张彪</h1>
  <img  src="http://192.168.1.112/wei.png"/ alt="How to configure Nginx cross-domain access and anti-leeching" >
</body>
</html>

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If the anti-hotlink configuration is not transferred from the www.zhangbiao.com domain name, an error will be reported How to configure Nginx cross-domain access and anti-leeching

location ~ .*\.(jpg|gif|png)$ {
  valid_referers none blocked www.zhangbiao.com;
  if ($invalid_referer) {
    return 403;
  }
  root /opt/app/code/images;
}
location ~ /test_refer.html {
  root /opt/app/code;
 
}

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Access

http://192.168.1.112/test_refer.html

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##Access

http://www.zhangbiao.com/test_refer.html

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##Allow other websites to access your website resource configuration

How to configure Nginx cross-domain access and anti-leeching

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