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Editor to share with you web security to prevent SQL injection methods, I believe that most people do not know much about it, so share this article for your reference, I hope you will learn a lot after reading this article, let's go to know it!

SQL injection is to deceive the server into executing malicious SQL commands by inserting SQL commands into the Web form to submit or enter the query string of the domain name or page request. For example, many previous film and television websites leak the VIP member password mostly through the WEB form to submit query characters, this kind of form is particularly vulnerable to SQL injection attacks.

SQL injection principle

A sql injection attack occurs when an application uses input to construct a dynamic sql statement to access the database. Sql injection also occurs if your code uses stored procedures that are passed as strings containing unfiltered user input.

Sql injection could cause an attacker to use an application login to execute commands in the database. This problem can become serious if the application uses an overprivileged account to connect to the database. In some forms, where user input is directly used to construct dynamic sql commands or as input parameters to stored procedures, these forms are particularly vulnerable to sql injection. However, when many website programs are written, they do not judge the legitimacy of the user input or improperly handle the variables in the program, so that the application program has security risks. In this way, the user can submit the code for a database query, obtain some sensitive information or control the entire server according to the results returned by the program, and sql injection occurs.

How to prevent SQL injection? Never trust the user's input. The user's input can be checked by regular expressions or by limiting the length, and then sensitive symbols such as single quotation marks and double "-" can be converted. Instead of using dynamic assembly sql, you can use parameterized sql or directly use stored procedures for data query and access. Never use database connections with administrator privileges, use separate database connections with limited permissions for each application, and do not store, encrypt, or hash secret information directly and remove passwords and sensitive information.

The applied exception information should give as few hints as possible, and it is best to wrap the original error message with custom error messages.

The above is all the contents of web security methods to prevent SQL injection, thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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