How To Install Redis And Configure Security Settings on Linux

For Debian-based systems, run the following commands:

user@localhost: ~ sudo apt update

Optional:

user@localhost: ~ sudo apt upgrade

user@localhost: ~ sudo apt install redis-server

For RedHat-based systems, you can connect a remi repository, and run the following commands:

user@localhost: ~ sudo yum install epel-release yum-utils

user@localhost: ~ sudo yum install http://rpms.remirepo.net/enterprise/remi-release-7.rpm

user@localhost: ~ sudo yum-config-manager --enable remi

user@localhost: ~ sudo yum install redis

user@localhost: ~ sudo systemctl start redis

user@localhost: ~ sudo systemctl enable redis

Check

netstat -plant | grep -i redis

tcp 0 0 127.0.0.1:6379 0.0.0.0:* LISTEN 1035/redis-server 1

If all goes well, Redis is listening on port 6379.

Security setting

Run redis-server only on localhost

In some Linux distributions, redis accepts requests on all interfaces after installation, which is not allowed for security reasons because redis access is not password protected by default.

Therefore, check the file /etc/redis/redis.conf contains the following line

bind 127.0.0.1

If it is not, enter it there.

Next, if prescribed, then restart Redis:

user@localhost: ~ sudo systemctl restart redis-server

– Put a password to access redis-server:

by default, anyone can connect to redis without a password, for example:

redis-cli info | grep redis_versio

Therefore, create a password of 32 characters:

user@localhost: ~ openssl rand -base64 32

get in the console something type Iouwokmsduhxvqj9fvz1tex9+VX0B1OG9r7sjAeuJY=

And in /etc/redis/redis.conf write on:

requirepass Iouwokmsduhxvqj9fvz1tex9+VX0B1OG9r7sjAeuJY=

Next, if prescribed, then restart Redis:

user@localhost: ~ sudo systemctl restart redis-server

Now when you try to do:

user@localhost: ~ redis-cli info | grep redis_version

if everything is configured correctly, anonymous access is denied and we will not see any information

Connect need now so

redis-cli

127.0.0.1:6379> info

NOAUTH Authentication required.

127.0.0.1:6379> AUTH IoUwOKmsDuHXvqj9FVVz1TEx9+VX0B1OG9r7sjAeuJY=

OK

127.0.0.1:6379> info

# Server

redis_version:2.8.17

redis_git_sha1:00000000

redis_git_dirty:0

redis_build_id:4c1d5710660b9479

redis_mode:standalone

os:Linux 3.16.0-4-amd64 x86_64

....

127.0.0.1:6379> quit

ATTENTION! By running redis-cli and entering commands in it, including AUTH with a password, the history of these commands is saved in the ~/file.rediscli_history. If an attacker gains access to it, they will be able to learn the password.

Certainly./~ rediscli_history is only available to the current user, such as root, and no one else will read it, but it’s better to know. The password is also stored in the /etc/redis/redis file.conf and by default this file is read by all users of the server, which is completely wrong and we will fix it further.

– Rename and disable important commands

Here’s a dangerous command Redis FLUSHDB, FLUSHALL, KEYS, PEXPIRE, DEL, CONFIG, SHUTDOWN, BGREWRITEAOF, BGSAVE, SAVE, SPOP, SREM, RENAME and DEBUG

To do this, use the /etc/redis/redis file.conf write on:

  • rename-command FLUSHDB “”
  • rename-command FLUSHALL “”
  • rename-command DEBUG “”
  • rename-command SHUTDOWN SHUTDOWN_SECRETCMD
  • rename-command CONFIG CONFIG_SECRETCMD

Next, if prescribed, then restart Redis:

user@localhost: ~ sudo systemctl restart redis-server

– Change the rights to the directory with the database and configuration file

Look at the default rights to the directory with the database:

ls -ld /var/lib/redis

drwxr-xr-x 2 redis redis 4096 Sep 9 10:14 redis

Change

chmod 700 /var/lib/redis

Look right in the default configuration file

ls -l /etc/redis/redis.conf

-rw-r--r-- 1 root root 33004 Sep 9 10:15 /etc/redis/redis.conf

Change

chown redis:root /etc/redis/redis.conf

chmod 600 /etc/redis/redis.conf

Next, if all done, then restart Redis:

user@localhost: ~ sudo systemctl restart redis-server

This completes the basic redis setup

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