How Teleport Works
Teleport is an identity-aware, multi-protocol access proxy which implements protocols such as SSH, RDP, HTTPS, Kubernetes API, MySQL, PostgreSQL and others. It is completely transparent to client-side tools and designed to work with everything in today's DevOps ecosystem.
Inside the downloaded tarball, you will find three
teleport daemon, the
tsh client, and the
tctl administration tool.
They are dependency-free, written in a compiled language. Teleport is
open source and the source code is available on Github.
The key concept of Teleport architecture is a "cluster". A Teleport cluster is a collection of resources such as servers, remote devices, databases, Kubernetes clusters or internal web apps.
Clients must authenticate with Teleport and receive a client certificate which
automatically works for all resources in a cluster, i.e. after authentication
mysql and other remote access commands will be
configured with user's identity.
Teleport offers a built-in database of users but for production use we recommend integrating it with enterprise SSO based on Okta, Github, Google Apps, Active Directory and other identity providers.
To create a minimal Teleport cluster, you must launch three services:
- Teleport Auth Service. The certificate authority of the cluster. It issues certificates to clients and maintains the audit log.
- Teleport Proxy Service. The proxy allows access to cluster resources from the outside. Typically it is the only service available from the public network.
- Teleport Node. A Teleport node is like "sshd on steroids". The node service runs near a target resource and speaks its native protocol such as SSH, Kubernetes API, HTTPS, PostgreSQL or MySQL wire protocols. Think a "smart sidecar" which routes user requests from a proxy to its target resource.
The diagram below is interactive, try clicking on individual components:
How Teleport Works
To learn more about how Teleport works, click on different areas of the diagram.
- User Connections
- Audit Information
teleport binary provides all three services. They can be enabled or
disabled via configuration or command line flags. To create a single-node
cluster, launch a single instance of the
teleport daemon with all services
How Teleport Cluster Works
The concept of a cluster is the foundation of the Teleport security model.
- Users and servers all must join the same cluster before access can be granted.
- To join a cluster, both users and servers must authenticate and receive certificates.
- The Teleport auth service is the CA of the cluster, which issues certificates for all supported protocols.
This model prevents honeypot attacks and eliminates the issue of trust on first use. This also allows users to enumerate all servers and other resources that are currently online.
Teleport clusters can be configured to trust each other. This allows users from one organization to access designated servers inside of another organization’s cloud or on-premise environment.
Users of Teleport Desktop access simply use a browser to access Windows hosts.
Teleport users of SSH, Kubernetes, and other command line-based clients, must
authenticate first by executing the
tsh login command. This command opens a
web browser to authenticate and exits upon successful authentication. This configures
users' CLI environment with short-lived certificates for access.
After that, users will be able to access their SSH servers, Kubernetes clusters,
web applications or databases. Teleport is backward compliant with existing
client tools so users can continue to use
commands as usual:
# First, 'tsh' commands authenticates users and configures other # CLI tools with a client's certificate: $ tsh login --proxy=proxy.example.com # SSH access as usual: $ ssh [email protected] # Kubernetes access as usual: $ kubectl get pods # Database access as usual: $ psql
How Authentication Works
Teleport proxy serves the login screen on
where users are asked for their username, password, and a 2nd factor. If a 3rd
party identity such as Github is used, the proxy forwards the user to Github
The proxy sends the user’s identity to the Teleport auth service. In turn, the auth service issues certificates for SSH, Kubernetes, and other resources in a cluster, and sends them back to the client via the proxy.
The client receives the certificates from the proxy, stores them in the user’s
~/.tsh directory, and loads them into the ssh-agent if one is running.
To learn more, check out the guide for the certificate-based SSH authentication.
The Teleport Auth service maintains the audit log of everything happening inside the environment. The audit log consists of two components:
- The event log. It consists of well-documented JSON records of security events. Examples of such events include login attempts, file transfers, code execution, filesystem changes, or network activity.
- The recorded sessions. All users’ interactive sessions to cluster nodes via the ssh and kubectl commands are recorded for future replay.
The Auth service stores both types of audit on a local file system by default, but can be configured to use S3, DynamoDB, and other suitable data stores.
The recorded sessions are stored as flat ASCII files and can be easily analyzed
by 3rd party software. For example, one can “replay” a session by dumping a
session file to stdout using
To learn more, check out the guide for the audit logging for the supported protocols.
Access for Edge Networks
Teleport allows users to access resources running on devices that are located anywhere in the world, for example devices on 3rd party networks or via a cellular connection. Examples of this include self-driving vehicles, network equipment, retail locations, medical devices, etc.
To make this work, each remote device must be configured to point at a Teleport
Proxy public address, like
proxy.example.com. This allows each device to
establish and maintain a permanent reverse tunnel to the cluster to which it
belongs. This tunnel is used to proxy user connections into devices. The tunnel
is automatically re-established if the network connectivity is intermittent.
Reverse tunnels enable Teleport users to:
- Manage IoT devices via SSH.
- Access Kubernetes clusters located on edge or IoT platforms.
- Access Web applications running on 3rd party private networks.
- Access MySQL and PostgreSQL databases running in remote environments.
To learn more, check out the guide for the Edge Access