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Version: 17.x (unreleased)

Database Access with Self-Hosted CockroachDB

Teleport can provide secure access to CockroachDB 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 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 chosen by the user.

In this guide, you will:

  1. Configure your CockroachDB 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 CockroachDB database using mutual TLS. CockroachDB 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.

Prerequisites​

  • A running Teleport cluster version 17.0.0-dev 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.

  • CockroachDB cluster.

  • A host, e.g., an Amazon EC2 instance, where you will run the Teleport Database Service.

  • 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@example.com
    $ tctl status
    # Cluster  teleport.example.com
    # Version  17.0.0-dev
    # 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.

  • A certificate authority to issue CockroachDB certificates for nodes in your CockroachDB cluster.

    Why do I need my own CA?

    Distributed databases like CockroachDB 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 CockroachDB node connects to another CockroachDB 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.

Step 1/4. 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:

Install Teleport on your Linux server:

  1. Assign edition to one of the following, depending on your Teleport edition:

    EditionValue
    Teleport Enterprise Cloudcloud
    Teleport Enterprise (Self-Hosted)enterprise
    Teleport Community Editionoss

  2. Get the version of Teleport to install. If you have automatic agent updates enabled in your cluster, query the latest Teleport version that is compatible with the updater:

    $ TELEPORT_DOMAIN=example.teleport.com
    $ TELEPORT_VERSION="$(curl https://$TELEPORT_DOMAIN/v1/webapi/automaticupgrades/channel/default/version | sed 's/v//')"

    Otherwise, get the version of your Teleport cluster:

    $ TELEPORT_DOMAIN=example.teleport.com
    $ TELEPORT_VERSION="$(curl https://$TELEPORT_DOMAIN/v1/webapi/ping | jq -r '.server_version')"

  3. Install Teleport on your Linux server:

    $ curl https://cdn.teleport.dev/install-v15.4.11.sh | bash -s ${TELEPORT_VERSION} edition

    The installation script detects the package manager on your Linux server and uses it to install Teleport binaries. To customize your installation, learn about the Teleport package repositories in the installation guide.

On the host where you will run the Teleport Database Service, start Teleport with the appropriate configuration.

Note that a single Teleport process can run multiple different services, for example multiple Database Service agents as well as the SSH Service or Application Service. The step below will overwrite an existing configuration file, so if you're running multiple services add --output=stdout to print the config in your terminal, and manually adjust /etc/teleport.yaml.

Generate a configuration file at /etc/teleport.yaml for the Database Service:

$ sudo teleport db configure create \
   -o file \
   --token=/tmp/token \
   --proxy=teleport.example.com:443 \
   --name=roach \
   --protocol=cockroachdb \
   --uri=roach.example.com:26257 \
   --labels=env=dev

Configure the Teleport Database Service to start automatically when the host boots up by creating a systemd service for it. The instructions depend on how you installed the Teleport Database Service.

On the host where you will run the Teleport Database Service, enable and start Teleport:

$ sudo systemctl enable teleport
$ sudo systemctl start teleport

You can check the status of the Teleport Database Service with systemctl status teleport and view its logs with journalctl -fu teleport.

Tip

A single Teleport process can run multiple services, for example multiple Database Service instances as well as other services such the SSH Service or Application Service.

Step 2/4. Create a Teleport user​

tip

To modify an existing user to provide access to the Database Service, see Database Access Controls

Create a local Teleport user with the built-in access role:

$ tctl users add \
  --roles=access \
  --db-users="*" \
  --db-names="*" \
  alice
FlagDescription
--rolesList of roles to assign to the user. The builtin access role allows them to connect to any database server registered with Teleport.
--db-usersList of database usernames the user will be allowed to use when connecting to the databases. A wildcard allows any user.
--db-namesList of logical databases (aka schemas) the user will be allowed to connect to within a database server. A wildcard allows any database.
warning

Database names are only enforced for PostgreSQL, MongoDB, and Cloud Spanner databases.

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

Step 3/4. Configure CockroachDB​

Create a CockroachDB user​

Teleport uses mutual TLS authentication with CockroachDB. Client certificate authentication is available to all CockroachDB users. If you don't have one, connect to your Cockroach cluster and create it:

CREATE USER alice WITH PASSWORD NULL;

The WITH PASSWORD NULL clause prevents the user from using password auth and mandates client certificate auth.

Make sure to assign the user proper permissions within the database cluster. Refer to Create User in the CockroachDB documentation for more information.

Set up mutual TLS​

To set up mutual TLS authentication, you need to make sure that:

  • Teleport trusts certificates presented by CockroachDB nodes.
  • CockroachDB nodes trust client certificates signed by both your CockroachDB CA and your Teleport cluster's db_client CA.

CockroachDB nodes need to trust the Teleport db_client CA so that Teleport users can authenticate to your CockroachDB cluster as clients.

The CockroachDB CA needs to be trusted by each CockroachDB node so that nodes can authenticate themselves as clients to other nodes in the CockroachDB cluster. This is because CockroachDB uses mTLS for node-to-node communication.

In this configuration, your CockroachDB CA will be used to issue the server cert node.crt for each CockroachDB node.

This configuration is simpler to set up, because an existing CockroachDB cluster already has node.crt issued for each node and you only need to configure the CockroachDB nodes to trust your Teleport db_client CA. Another benefit is that your CockroachDB nodes will continue to serve the same CockroachDB CA-issued cert, rather than serving a new cert signed by Teleport's db CA, so you don't have to configure other clients to trust a new CA.

Copy your CockroachDB CA cert to ca-client.crt in the certs directory of each CockroachDB node:

$ CERTS_DIR=/path/to/cockroachdb/certs/dir
$ cp "${CERTS_DIR}/ca.crt" "${CERTS_DIR}/ca-client.crt"

Next, for each CockroachDB node, export Teleport's db_client CA using tctl (or export it once and copy it to each node) and append the certificate to ca-client.crt:

$ tctl auth export --type=db-client >> /path/to/cockroachdb/certs/dir/ca-client.crt

Modify the Teleport Database Service to trust your CockroachDB CA:

  databases:
  - name: "example-cockroachdb"
    protocol: "cockroachdb"
    uri: "cockroachdb.example.com:26257"
    static_labels:
      "env": "example"
    tls:
      ca_cert_file: "undefined"

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

Restart your CockroachDB nodes, passing them the directory with generated secrets via the --certs-dir flag:

$ cockroach start \
    --certs-dir=/path/to/cockroachdb/certs/dir \
    # other flags...

Alternatively, if the nodes were already started with --certs-dir=<Var name="/path/to/cockroachdb/certs/dir" />, you can send a SIGHUP signal to the cockroach process to reload certificates without restarting the node. You must send SIGHUP as the same user that started the cockroach process:

$ pkill -SIGHUP -x cockroach

Step 4/4. Connect​

Log in to your Teleport cluster. Your CockroachDB cluster should appear in the list of available databases:

$ tsh login --proxy=teleport.example.com --user=alice
$ tsh db ls
# Name  Description         Labels
# ----- ------------------- -------
# roach Example CockroachDB env=dev

To retrieve credentials for a database and connect to it:

$ tsh db connect roach

You can optionally specify the database name and the user to use by default when connecting to the database server:

$ tsh db connect --db-user=alice roach
note

Either the cockroach or psql command-line client should be available in PATH in order to be able to connect.

To log out of the database and remove credentials:

$ tsh db logout roach

Troubleshooting​

Unimplemented client encoding error​

You may encounter the unimplemented client encoding: "sqlascii" error when connecting to your CockroachDB database if your psql uses SQL_ASCII encoding.

CockroachDB supports only UTF8 client encoding. To enforce the encoding, set the following environment variable in the shell running tsh db connect:

export PGCLIENTENCODING='utf-8'

If you are connecting the CockroachDB database with Teleport Connect, add the environment variable to your shell startup scripts and restart the Teleport Connect app.

Unable to cancel a query​

If you use a PostgreSQL cli client like psql, and you try to cancel a query with ctrl+c, but it doesn't cancel the query, then you need to connect using a tsh local proxy instead. When psql cancels a query, it establishes a new connection without TLS certificates, however Teleport requires TLS certificates not only for authentication, but also to route database connections.

If you enable TLS Routing in Teleport then tsh db connect will automatically start a local proxy for every connection. Alternatively, you can connect via Teleport Connect which also uses a local proxy. Otherwise, you need to start a tsh local proxy manually using tsh proxy db and connect via the local proxy.

If you have already started a long-running query in a psql session that you cannot cancel with ctrl+c, you can start a new client session to cancel that query manually:

First, find the query's process identifier (PID):

SELECT pid,usename,backend_start,query FROM pg_stat_activity WHERE state = 'active';

Next, gracefully cancel the query using its PID. This will send a SIGINT signal to the postgres backend process for that query:

SELECT pg_cancel_backend(<PID>);

You should always try to gracefully terminate a query first, but if graceful cancellation is taking too long, then you can forcefully terminate the query instead. This will send a SIGTERM signal to the postgres backend process for that query:

SELECT pg_terminate_backend(<PID>);

See the PostgreSQL documentation on admin functions for more information about the pg_cancel_backend and pg_terminate_backend functions.

Next steps​

  • Take a look at the YAML configuration reference.