No More Backdoors: Know Who Has Access to What, Right Now
Jun 13
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Teleport

Networking

Public address

All Teleport services (e.g., the Proxy Service, Auth Service, and agents) have an optional public_addr property that you can modify in each service's configuration file. The public address can take an IP or a DNS name. It can also be a list of values:

public_addr: ["proxy-one.example.com", "proxy-two.example.com"]

Specifying a public address for a Teleport service may be useful in the following use cases:

  • You have multiple identical services, e.g., Proxy Service instances, behind a load balancer.
  • You want Teleport to issue an SSH certificate for the service with additional principals, e.g., host names.

All Teleport services (e.g., the Application Service and Database Service) have an optional public_addr property that you can modify in each service's configuration file. The public address can take an IP or a DNS name. It can also be a list of values:

public_addr: ["service-one.example.com", "service-two.example.com"]

Specifying a public address for a Teleport agent may be useful in the following use cases:

  • You have multiple identical services behind a load balancer.
  • You want Teleport to issue an SSH certificate for the service with additional principals, e.g., host names.

HTTP CONNECT proxies

Some networks funnel all connections through a proxy server where they can be audited and access control rules can be applied. For these scenarios, Teleport supports HTTP CONNECT tunneling. HTTP CONNECT applies to:

  • tsh in all cases.
  • Teleport services, such as the SSH Service and Database Service, that dial back to the Teleport Proxy Service.

To use HTTP CONNECT tunneling, set the HTTPS_PROXY and HTTP_PROXY environment variables when running Teleport. You can also optionally set the NO_PROXY environment variable to avoid use of the proxy when accessing specified hosts/netmasks/ports.

By default, Teleport installations based on package managers (such as apt and yum) configure The teleport systemd unit to read environment variables from the file /etc/default/teleport by using the EnvironmentFile field:

[Unit]
Description=Teleport Service
After=network.target

[Service]
Type=simple
Restart=always
RestartSec=5
EnvironmentFile=-/etc/default/teleport
ExecStart=/usr/local/bin/teleport start --config /etc/teleport.yaml --pid-file=/run/teleport.pid
# systemd before 239 needs an absolute path
ExecReload=/bin/sh -c "exec pkill -HUP -L -F /run/teleport.pid"
PIDFile=/run/teleport.pid
LimitNOFILE=524288

[Install]
WantedBy=multi-user.target

To configure HTTP CONNECT tunneling, you can assign these environment variables within /etc/default/teleport on machines that run Teleport binaries. Use the following example, replacing proxy.example.com with the address of your proxy:

HTTP_PROXY=http://proxy.example.com:8080/
HTTPS_PROXY=http://proxy.example.com:8080/
NO_PROXY=localhost,127.0.0.1,192.168.0.0/16,172.16.0.0/12,10.0.0.0/8

When Teleport builds and establishes the reverse tunnel to the main cluster, it will funnel all traffic through the proxy. Specifically, if using the default configuration, Teleport will tunnel ports 3024 (SSH, reverse tunnel) and 3080 (HTTPS, establishing trust) through the proxy. If you don't want to proxy some of this traffic (for example, proxying HTTPS but not SSH), assign NO_PROXY to the address of the Teleport Proxy Service endpoint you want to exclude from HTTP_CONNECT tunneling in host:port format.

For example, you can modify the environment file at /etc/default/teleport on each machine that runs a Teleport binary to resemble the following:

HTTP_PROXY=http://httpproxy.example.com:8080/
HTTPS_PROXY=http://httpproxy.example.com:8080/
NO_PROXY=teleportproxy.example.com:3024

The value of HTTPS_PROXY or HTTP_PROXY should be in the format scheme://[user[:password]@]host:port where scheme is either https or http . If the value is host:port , Teleport will prepend http .

Note

localhost and 127.0.0.1 are invalid values for the proxy host. If for some reason your proxy runs locally, you'll need to provide some other DNS name or a private IP address for it.

Note

The proxy service also respects HTTPS_PROXY and HTTP_PROXY when connecting to a local kubernetes cluster, which may not work. To fix this, add kube.teleport.cluster.local to NO_PROXY.

Ports

This section describes the ports you should open on your Teleport instances.

Proxy Service ports

Note

To get a listing of the assigned ports for an instance of the Teleport Proxy Service, use the following command:

curl https://teleport.example.com:443/webapi/ping | jq

Note that if auth_service.proxy_listener_mode is set to multiplex in your Teleport configuration, that means only a single port is used for multiple services through the Proxy.

Ports with TLS routing

TLS routing is enabled by default. In this mode, all connections to a Teleport service (e.g., the Teleport SSH Service or Kubernetes) are routed through the Proxy Service's public web address.

Read more in our TLS Routing guide.

PortDownstream ServiceDescription
443Proxy ServiceIn TLS Routing mode, the Proxy handles all protocols, including Web UI, HTTPS, Kubernetes, SSH, and all databases on a single port.
3021Proxy ServicePort used by Teleport Proxy Service instances to dial agents in Proxy Peering mode.

Ports without TLS routing

In some cases, administrators may want to use separate ports for different services. In those cases, they can set up separate listeners in the config file.

PortDownstream ServiceDescription
3021Proxy ServicePort used by Teleport Proxy Service instances to dial agents in Proxy Peering mode.
3023All clientsSSH port clients connect to. The Proxy Service will forward this connection to port 3022 on the destination service.
3024Auth ServiceSSH port used to create reverse SSH tunnels from behind-firewall environments into a trusted Proxy Service instance.
3080 or 443Proxy ServiceHTTPS connection to authenticate tsh users into the cluster. The same connection is used to serve a Web UI.
3036Database ServiceTraffic to MySQL databases.
5432Database ServiceTraffic to Postgres databases.
27017Database ServiceTraffic to MongoDB instances.
6379Database ServiceTraffic to Redis instances.

Auth Service ports

PortDownstream ServiceDescription
3025All Teleport servicesTLS port used by the Auth Service to serve its gRPC API to other Teleport services in a cluster.

Proxy Service ports

Cloud-hosted Teleport deployments allocate a different set of ports to each tenant's Proxy Service. To see which ports are available for your Teleport tenant, run a command similar to the following, replacing mytenant.teleport.sh with your tenant domain:

curl https://mytenant.teleport.sh/webapi/ping | jq '.proxy'

The output should resemble the following, including the unique ports assigned to your tenant:

{
  "kube": {
    "enabled": true,
    "public_addr": "mytenant.teleport.sh:11107",
    "listen_addr": "0.0.0.0:3026"
  },
  "ssh": {
    "listen_addr": "[::]:3023",
    "tunnel_listen_addr": "0.0.0.0:3024",
    "public_addr": "mytenant.teleport.sh:443",
    "ssh_public_addr": "mytenant.teleport.sh:11105",
    "ssh_tunnel_public_addr": "mytenant.teleport.sh:11106"
  },
  "db": {
    "postgres_public_addr": "mytenant.teleport.sh:11109",
    "mysql_listen_addr": "0.0.0.0:3036",
    "mysql_public_addr": "mytenant.teleport.sh:11108"
  },
  "tls_routing_enabled": true
}

This output also indicates whether TLS routing is enabled for your tenant. When TLS routing is enabled, connections to a Teleport service (e.g., the Teleport SSH Service) are routed through the Proxy Service's public web address, rather than through a port allocated to that service.

In this case, you can see that TLS routing is enabled, and that the Proxy Service's public web address (ssh.public_addr) is mytenant.teleport.sh:443.

Read more in our TLS Routing guide.

Agent ports

Teleport agents dial the Teleport Proxy Service to establish a reverse tunnel. Client traffic flows via the Proxy Service to the agent, and the agent forwards traffic to resources in your infrastructure.

As a result, for Teleport processes running agents, e.g., instances of the SSH Service, Kubernetes Service, and other services that protect resources in your infrastructure, there is no need to open ports on the machines running the agents to the public internet.

Some Teleport services listen for traffic to one of their proxied resources, meaning that you can expose ports on that service's host directly to clients. This is useful when you need to connect to resources directly if the Proxy Service becomes unavailable.

Note

In Teleport Cloud, the Auth and Proxy Services run in Teleport-owned infrastructure. For this reason, Teleport Cloud customers must connect their resources via reverse tunnels. Exposing ports for direct dial is only supported in self-hosted deployments.

The table below describes the ports that each Teleport Service opens for proxied traffic:

PortServiceTraffic Type
3022SSH ServiceIncoming SSH connections.
3026Kubernetes ServiceHTTPS traffic to a Kubernetes API server.
3028Windows Desktop ServiceTeleport Desktop Protocol traffic from Teleport clients.

You can only access enrolled applications and databases through the Teleport Proxy Service. The Teleport Application Service and Teleport Database Service use reverse tunnel connections through the Teleport Proxy Service and cannot expose ports directly.