Database Access with Redis Cluster

If you want to configure Redis Standalone, please read Database Access with Redis.

Teleport can provide secure access to Redis cluster via the Teleport Database Service. This allows for fine-grained access control through the Teleport RBAC system.

The Teleport Database Service proxies traffic from database clients to self-hosted databases in your infrastructure. Teleport maintains a certificate authority (CA) for database clients. You configure your database to trust the Teleport database client CA, and the Teleport Database Service presents certificates signed by this CA when proxying user traffic. With this setup, there is no need to store long-lived credentials for self-hosted databases.

Meanwhile, the Teleport Database Service verifies self-hosted databases by checking their TLS certificates against either the Teleport database CA or a custom CA used with the database.

In this guide, you will:

1. Configure your Redis cluster database for Teleport access.
2. Add the database to your Teleport cluster.
3. Connect to the database via Teleport.

How it works

The Teleport Database Service authenticates to your self-hosted Redis cluster database using mutual TLS. Redis cluster trusts the Teleport certificate authority for database clients, and presents a certificate signed by either the Teleport database CA or a custom CA. When a user initiates a database session, the Teleport Database Service presents a certificate signed by Teleport. The authenticated connection then proxies client traffic from the user.

• Self-Hosted
• Teleport Cloud

Prerequisites

• A running Teleport cluster version 16.4.12 or above. If you want to get started with Teleport, sign up for a free trial or set up a demo environment.

• The tctl admin tool and tsh client tool.

  Visit Installation for instructions on downloading tctl and tsh.

• Redis version 6.0 or newer.

  Note

  RESP3 (REdis Serialization Protocol) is currently not supported.

• redis-cli version 6.2 or newer installed and added to your system's PATH environment variable.

• A host where you will run the Teleport Database Service.

• A certificate authority to issue server certificates for nodes in your Redis Cluster.

  Why do I need my own CA?

  Distributed databases like Redis Cluster use mTLS for node-to-node communication. Teleport requires that you have your own CA to issue certificates for node-to-node mTLS communication.

  Teleport uses a split-CA architecture for database access. The Teleport db CA issues server certificates and the db_client CA issues client certificates.

  Databases are configured to trust the Teleport db_client CA for client authentication, but not the db CA. Additionally, Teleport only issues ephemeral db_client CA certificates.

  When a Redis Cluster node connects to another Redis Cluster node, it must present a certificate that the other node trusts for client authentication. Since Teleport does not issue long-lived db_client certificates, the node needs to have a long-lived certificate issued by another CA that its peer node trusts.

  The split db and db_client CA architecture was introduced as a security fix in Teleport versions: 13.4.17, 14.3.7, and 15.

  See Database CA Migrations for more information.

• To check that you can connect to your Teleport cluster, sign in with tsh login, then verify that you can run tctl commands using your current credentials.

  For example:

  tsh login --proxy=teleport.example.com --user=[email protected]
  tctl status
  Cluster  teleport.example.com
  Version  16.4.12
  CA pin   sha256:abdc1245efgh5678abdc1245efgh5678abdc1245efgh5678abdc1245efgh5678

  If you can connect to the cluster and run the tctl status command, you can use your current credentials to run subsequent tctl commands from your workstation. If you host your own Teleport cluster, you can also run tctl commands on the computer that hosts the Teleport Auth Service for full permissions.

Step 1/6. Set up the Teleport Database Service

The Database Service requires a valid join token to join your Teleport cluster. Run the following tctl command and save the token output in /tmp/token on the server that will run the Database Service:

tctl tokens add --type=db --format=text
abcd123-insecure-do-not-use-this

Install and configure Teleport where you will run the Teleport Database Service:

sudo teleport db configure create \   -o file \   --token=/tmp/token \   --proxy=teleport.example.com:443 \   --name=example-redis \   --protocol=redis \   --uri=rediss://redis.example.com:6379?mode=cluster \   --labels=env=dev 

sudo teleport db configure create \   -o file \   --token=/tmp/token \   --proxy=mytenant.teleport.sh:443 \   --name=example-redis \   --protocol=redis \   --uri=rediss://redis.example.com:6379?mode=cluster \   --labels=env=dev

sudo systemctl enable teleport
sudo systemctl start teleport

sudo teleport install systemd -o /etc/systemd/system/teleport.service
sudo systemctl enable teleport
sudo systemctl start teleport

helm repo add teleport https://charts.releases.teleport.dev

helm repo update

JOIN_TOKEN=$(cat /tmp/token)
helm install teleport-kube-agent teleport/teleport-kube-agent \  --create-namespace \  --namespace teleport-agent \  --set roles=db \  --set proxyAddr=teleport.example.com:443 \  --set authToken=${JOIN_TOKEN?} \  --set "databases[0].name=example-redis" \  --set "databases[0].uri=rediss://redis.example.com:6379?mode=cluster" \  --set "databases[0].protocol=redis" \  --set "databases[0].static_labels.env=dev" \  --version 16.4.12

JOIN_TOKEN=$(cat /tmp/token)
helm install teleport-kube-agent teleport/teleport-kube-agent \  --create-namespace \  --namespace teleport-agent \  --set roles=db \  --set proxyAddr=mytenant.teleport.sh:443 \  --set authToken=${JOIN_TOKEN?} \  --set "databases[0].name=example-redis" \  --set "databases[0].uri=rediss://redis.example.com:6379?mode=cluster" \  --set "databases[0].protocol=redis" \  --set "databases[0].static_labels.env=dev" \  --version 16.4.9

kubectl -n teleport-agent get pods
NAME                    READY   STATUS    RESTARTS   AGEteleport-kube-agent-0   1/1     Running   0          32s

Step 2/6. Create a Teleport user

tctl users add \  --roles=access \  --db-users="*" \  --db-names="*" \  alice

tctl users add \  --roles=access,requester \  --db-users="*" \  --db-names="*" \  alice

For more detailed information about database access controls and how to restrict access see RBAC documentation.

Step 3/6. Create Redis users

Each Redis user must be protected by a strong password. We recommend using OpenSSL to generate passwords:

openssl rand -hex 32

ACL GENPASS

Create a users.acl file, which defines users for your Redis deployment, passwords required to log in as a given user, and sets of ACL rules. Redis allows you to provide passwords in plaintext or an SHA256 hash. We strongly recommend using an SHA256 hash instead of plaintext passwords.

You can use the command below to generate an SHA256 hash from a password.

echo -n STRONG_GENERATED_PASSWORD | sha256sum

user alice on #57639ed88a85996453555f22f5aa4147b4c9614056585d931e5d976f610651e9 allcommands allkeys
user default off

For more ACL examples refer to the Redis documentation.

Step 4/6. Set up mutual TLS

Export your Teleport cluster's db_client CA cert and concatenate it with your Redis Cluster's CA cert (in PEM format):

tctl auth export --type=db-client > db-client-ca.crt
cat /path/to/your/ca.crt db-client-ca.crt > pem-bundle.cas

Using your Redis Cluster's CA, issue server.crt for each of your Redis Cluster nodes and enable mutual TLS in your redis.conf configuration file, then restart each node:

tls-port 7001
port 0
cluster-enabled yes
tls-replication yes
tls-cluster yes
aclfile /path/to/users.acl
masterauth GENERATED_STRONG_PASSWORD
masteruser replica-user
tls-cert-file /usr/local/etc/redis/certs/server.crt
tls-key-file /usr/local/etc/redis/certs/server.key
tls-ca-cert-file /usr/local/etc/redis/certs/pem-bundle.cas
tls-protocols "TLSv1.2 TLSv1.3"

Once mutual TLS has been enabled, you will no longer be able to connect to the cluster without providing a valid client certificate. You can use the tls-auth-clients optional setting to allow connections from clients that do not present a certificate.

See TLS Support in the Redis documentation for more details.

Modify the Teleport Database Service to trust your Redis Cluster CA:

  databases:
  - name: "example-redis"
    protocol: "redis"
    uri: "rediss://redis.example.com:6379?mode=cluster"
    static_labels:
      "env": "example"
    tls:
      ca_cert_file: "/path/to/your/ca.crt"

Now the Teleport Database Service will trust certificates presented by your Redis Cluster.

Step 5/6. Create a cluster

To create the cluster after mutual TLS is enabled, you will need to use a certificate that the Redis nodes trust for client authentication. You can use a certificate that you already issued for one of the nodes, i.e. server.crt or you can issue a new client certificate using your Redis Cluster CA.

Use the following command to create the cluster. Please note redis-cli --cluster create accepts only IP addresses.

export REDISCLI_AUTH=STRONG_GENERATED_PASSWORD
export CERTS_DIR=/path/to/certs/
export IP1=10.0.0.1 # update with the real node 1 IP
export IP2=10.0.0.2 # update with the real node 2 IP
export IP3=10.0.0.3 # update with the real node 3 IP
export IP4=10.0.0.4 # update with the real node 4 IP
export IP5=10.0.0.5 # update with the real node 5 IP
export IP6=10.0.0.6 # update with the real node 6 IP
redis-cli --user alice --cluster-replicas 1 --tls --cluster-yes \  --cluster create ${IP1}:7001 ${IP2}:7002 ${IP3}:7003 ${IP4}:7004 ${IP5}:7005 ${IP6}:7006 \  --cacert ${CERTS_DIR}/ca.crt --key ${CERTS_DIR}/server.key --cert ${CERTS_DIR}/server.crt

Step 6/6. Connect

To enable Redis cluster mode in Teleport, add the mode=cluster parameter to the connection URI in your Teleport Database Service config file.

databases:
  - name: "redis-cluster"
    uri: "rediss://redis.example.com:6379?mode=cluster"

Log into your Teleport cluster and see available databases:

tsh login --proxy=teleport.example.com --user=alice
tsh db ls
Name          Description     Labels
------------- --------------- --------
example-redis Example Redis   env=dev

tsh login --proxy=mytenant.teleport.sh --user=alice
tsh db ls
Name          Description     Labels
------------- --------------- --------
example-redis Example Redis   env=dev

To connect to a particular database instance:

tsh db connect example-redis

You can optionally specify the database user to use by default when connecting to the database instance:

tsh db connect --db-user=alice example-redis

If flag --db-user is not provided, Teleport logs in as the default user.

Now you can log in as the previously created user using the below command:

AUTH alice STRONG_GENERATED_PASSWORD

To log out of the database and remove credentials:

Remove credentials for a particular database instance.
tsh db logout example-redis
Remove credentials for all database instances.
tsh db logout

Supported Redis Cluster commands

Redis in cluster mode does not support the following commands. If one of the listed commands above is called Teleport returns the ERR Teleport: command not supported error.

Teleport conducts additional processing on the following commands before communicating with Redis Cluster:

Next steps

• Learn how to restrict access to certain users and databases.

• View the High Availability (HA) guide.

• Take a look at the YAML configuration reference.

• See the full CLI reference.