Redis is an open source in-memory database. Due to its high performance, scalability and ease of use, it is increasingly favored by developers in practical applications. However, when using Redis, due to its large number of configuration options and powerful command set, if security is not hardened, you may face various security threats and attack risks. This article will focus on the practical application of Redis in security reinforcement and protection.

1. Common Redis attack methods

When applying Redis, in order to protect the Redis instance from being attacked and illegally operated, we need to pay attention to the following aspects:

1 .Unauthorized access: Redis does not enable access control by default. If no authorization mechanism such as password is set, then anyone can connect to the Redis instance through the Redis client and perform read and write operations and other sensitive operations. This attack method is relatively common.

2. Command injection attack: The command set of Redis is very powerful. If illegal parameters or data formats are passed, command injection attacks may occur. This attack method is also very common.

3. Code injection attack: Redis supports executing Lua scripts. If the passed script is not secure, it may lead to code injection attacks. This attack method may cause the Redis instance to be completely controlled, causing serious consequences.

2. Common methods of Redis security reinforcement

To ensure the security of Redis, we can use the following common security reinforcement methods:

1. Use password authentication: for Redis Setting a password is the simplest and most common security reinforcement method to prevent unauthorized access.

Find the following configuration items in the redis.conf file:

# requirepass foobared

Change the following foobared to your own password to complete Password setting. After setting the password, Redis can only be accessed after entering the correct password.

2. Prohibit public network access: Redis’s access control mechanism is relatively simple. If public network access is directly allowed, then anyone can connect to the Redis instance in a simple way. Therefore, we can only allow specific IPs to access Redis by configuring the bind option of Redis.

Find the following configuration items in the redis.conf file:

# bind 127.0.0.1

Change 127.0.0.1 to your own IP address , so that the Redis instance will only accept connection requests from the specified IP.

3. Limit command operations: Redis provides a complete set of commands, which also means that attackers can inject illegal commands in various ways, so we need to limit the commands that a Redis instance can execute.

Find the following configuration items in the redis.conf file:

# rename-command CONFIG ""

Here is an example of disabling the CONFIG command. Remove the # sign in front of the configuration command and restart the Redis instance to take effect. In the same way, dangerous commands can be disabled to limit the operating scope of the Redis instance.

4. Set the timeout: Redis supports setting the connection timeout and command execution timeout, so that even if the user forgets to close the connection or the executed command has security risks, the connection can be automatically closed or terminated after the timeout is reached. Command execution, thereby reducing security risks.

Find the following configuration items in the redis.conf file:

timeout 0

Change 0 to the timeout you need.

5. Protection at the network layer: No matter which method is used to protect the Redis instance, attention must be paid to protecting against network attacks, such as using network layer security mechanisms for protection, such as firewalls and other tools.

3. Redis practical security application example

The following is a simple Redis security practical application example to better understand the practicality of Redis in security protection.

1. Use the master-slave architecture to provide high availability: Using the master-slave architecture can increase the availability of the Redis instance, and at the same time set passwords in the master node and the slave node respectively, thereby improving the security of the Redis instance.

2. Set persistence: You can persist the data in Redis to the hard disk by setting the persistence mechanism to prevent data loss. At the same time, data security can also be improved through regular backups!

3. Use SSL/TLS protocol for encryption: SSL/TLS protocol can protect sensitive data during Redis communication, and the data is encrypted during the communication process. , preventing attackers in the network from stealing data, thus increasing the security of Redis.

4. Conclusion

When using Redis, if necessary security measures cannot be taken, you may face a variety of attacks and security risks, including unauthorized access, command injection attacks, and code injection. Attack etc.

Methods for security hardening of Redis include setting password authentication, prohibiting public network access, restricting command operations, setting timeouts, and performing network layer protection.

Ultimately, we need to choose the appropriate security reinforcement method based on the actual situation to protect the security of the Redis instance. During the Redis application process, we should fully understand the security risks of Redis and take appropriate security measures to ensure the security and stability of the Redis system.

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