teleport/docs/4.4/aws-oss-guide.md

title	description
Running Teleport on AWS	How to install and configure Gravitational Teleport on AWS for SSH and Kubernetes access.

Running Teleport on AWS

We've created this guide to give customers a high level overview of how to use Teleport on Amazon Web Services (AWS). This guide provides a high level introduction leading to a deep dive into how to setup and run Teleport in production.

We have split this guide into:

• Teleport on AWS FAQ
• Authenticating to EKS Using GitHub Credentials with Teleport Community Edition
• Setting up Teleport Enterprise on AWS
• Teleport AWS Tips & Tricks
• AWS HA with Terraform

Teleport on AWS FAQ

Why would you want to use Teleport with AWS?

At some point you'll want to log into the system using SSH to help test, debug and troubleshoot a problem box. For EC2, AWS recommends creating 'Key Pairs' and has a range of other tips for securing EC2 instances.

This approach has a number of limitations:

1. As your organization grows, keeping track of end users' public/private keys becomes an administrative nightmare.
2. Using SSH public/private keys has a number of limitations. Read why SSH Certificates are better.
3. Once a machine has been bootstrapped with SSH Keys, there isn't an easy way to add new keys and delegate access.

Which Services can I use Teleport with?

You can use Teleport for all the services that you would SSH into. This guide is focused on EC2. We have a short blog post on using Teleport with EKS. We plan to expand the guide based on feedback but will plan to add instructions for the below.

• RDS
• Detailed EKS
• Lightsail
• Fargate
• AWS ECS

Teleport Introduction

This guide will cover how to setup, configure and run Teleport on AWS.

AWS Services required to run Teleport in HA

• EC2 / Autoscale
• DynamoDB
• S3
• Route53
• NLB
• IAM
• ACM
• SSM

We recommend setting up Teleport in high availability mode (HA). In HA mode DynamoDB stores the state of the system and S3 will store audit logs.

EC2 / Autoscale

To run Teleport in a HA configuration we recommend using m4.large instances. It's best practice to separate the proxy and authentication server, using autoscaling groups for both machines. We have pre-built AMIs for both Teleport OSS and Enterprise editions. Instructions on using these AMIs are below.

DynamoDB

DynamoDB is a key-value and document database that delivers single-digit millisecond performance at any scale. For large clusters you can provision usage but for smaller deployments you can leverage DynamoDB's autoscaling.

Teleport 4.0 leverages DynamoDB's streaming feature. When turning this on, you'll need to specify New Image from the streaming options. DynamoDB back-end supports two types of Teleport data:

• Cluster state
• Cluster events

See DynamoDB Admin Guide for more information

Setting Stream to NEW IMAGE

For maintainability and ease of use, we recommend following our Terraform example but below are high level definitions for the tables required to run Teleport.

DynamoDB Table A - Teleport Cluster State:

Table name	teleport-cluster-name
Primary partition key	HashKey (String)
Primary sort key	FullPath (String)

DynamoDB Table B - Teleport Cluster Events:

Table name	teleport-cluster-name-events
Primary partition key	SessionID (String)
Primary sort key	EventIndex (Number)

Indexes - timesearch	teleport-cluster-name-events
Primary partition key	EventNamespace (String)
Primary sort key	CreatedAt (Number)
Attributes	ALL

S3

Amazon Simple Storage Service (Amazon S3) is an object storage service that offers industry-leading scalability, data availability, security, and performance. In this Teleport setup, S3 will provide storage for recorded sessions.

We recommend using Amazon S3 Standard.

!!! tip "Tip"

S3 provides [Amazon S3 Object Lock](https://docs.aws.amazon.com/AmazonS3/latest/dev/object-lock.html),
which is useful for customers deploying Teleport in regulated environments.

Route53

Route53 is a highly available Domain Name System (DNS) provided by AWS. It'll be needed to setup a URL for the proxy - we recommend using a subdomain.

e.g. teleport.acmeinc.com

NLB: Network Load Balancer

AWS provides many different load balancers. To setup Teleport, we recommend using a Network Load Balancer. Network Load Balancers provides TLS for the Teleport proxy and provides the TCP connections needed for Teleport proxy SSH connections.

IAM

IAM is the recommended tool for creating service access. This guide will follow the best practice of principle of least privilege (PoLP).

IAM for Amazon S3

In order to grant an IAM user in your AWS account access to one of your buckets, example.s3.bucket you will need to grant the following permissions: s3:ListBucket, s3:ListBucketVersions, s3:PutObject, s3:GetObject, s3:GetObjectVersion

An example policy is shown below:

{
   "Version": "2012-10-17",
   "Statement": [
     {
       "Effect": "Allow",
       "Action": [
         "s3:ListBucket",
         "s3:ListBucketVersions"
        ],
       "Resource": ["arn:aws:s3:::example.s3.bucket"]
     },
     {
       "Effect": "Allow",
       "Action": [
         "s3:PutObject",
         "s3:GetObject",
         "s3:GetObjectVersion"
       ],
       "Resource": ["arn:aws:s3:::example.s3.bucket/*"]
     }
   ]
 }

!!! note "Note"

`example.s3.bucket` will need to be replaced with your bucket name.

IAM for DynamoDB

In order to grant an IAM user access to DynamoDB make sure that the IAM role assigned to Teleport is configured with proper permissions.

An example policy is shown below:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "AllAPIActionsOnTeleportClusterState",
            "Effect": "Allow",
            "Action": "dynamodb:*",
            "Resource": "arn:aws:dynamodb:REGION:ACCOUNTID:table/DYNAMODB-RESOURCE-A"
        },
        {
            "Sid": "AllAPIActionsOnTeleportClusterStateStreams",
            "Effect": "Allow",
            "Action": "dynamodb:*",
            "Resource": "arn:aws:dynamodb:REGION:ACCOUNTID:table/DYNAMODB-RESOURCE-A/stream/*"
        },
        {
            "Sid": "AllAPIActionsOnTeleportClusterEvents",
            "Effect": "Allow",
            "Action": "dynamodb:*",
            "Resource": "arn:aws:dynamodb:REGION:ACCOUNTID:table/DYNAMODB-RESOURCE-B"
        },
        {
            "Sid": "AllAPIActionsOnTeleportClusterEventsStreams",
            "Effect": "Allow",
            "Action": "dynamodb:*",
            "Resource": "arn:aws:dynamodb:REGION:ACCOUNTID:table/DYNAMODB-RESOURCE-B/stream/*"
        },
        {
            "Sid": "AllAPIActionsOnTeleportClusterEventIndex",
            "Effect": "Allow",
            "Action": "dynamodb:*",
            "Resource": "arn:aws:dynamodb:REGION:ACCOUNTID:table/DYNAMODB-RESOURCE-B/index/*"
        },
    ]
}

!!! note "Note"

`arn:aws:dynamodb:REGION:ACCOUNTID:table/DYNAMODB-RESOURCE-A` and `RESOURCE-B` will need to be replaced with your two DynamoDB tables.

ACM

With AWS Certificate Manager, you can quickly request SSL/TLS certificates.

• TLS Cert: Used to provide SSL for the proxy.
• SSH Certs (not in ACM): Created and self signed by the authentication server and are used to delegate access to Teleport nodes.

AWS Systems Manager Parameter Store

To add new nodes to a Teleport Cluster, we recommend using a strong static token. SSM can be also used to store the enterprise licence.

Setting up a HA Teleport Cluster

Teleport's config based setup offers a wide range of customization for customers. This guide offers a range of setup options for AWS. If you have a very large account, multiple accounts, or over 10k users we would recommend getting in touch. We are more than happy to help you architect, setup and deploy Teleport into your environment.

We have these options for you.

• Deploying with CloudFormation
• Deploying with Terraform HA + Monitoring

Deploying with CloudFormation

We are currently working on an updated CloudFormation guide but you can start with our AWS AMI example. It requires a VPC, but we expect customers to deploy within an already existing VPC.

Deploying with Terraform

To deploy Teleport in AWS using Terraform look at our AWS Guide.

Installing Teleport to EC2 Server

Customers run many workloads within EC2 and depending on how you work there are many ways to integrate Teleport onto your servers. We recommend looking at our Admin manual.

In short, to add new nodes / EC2 servers that you can "SSH into" you'll need to

1. Install the Teleport Binary on the Server

• Run Teleport, we recommend using SystemD
• Set the correct settings in /etc/teleport.yaml
• Add EC2 nodes to the Teleport cluster

Upgrading

To upgrade to a newer version of Teleport:

• Back up /etc/teleport.yaml, /etc/teleport.d/ and the contents of /var/lib/teleport
• Launch a new instance with the correct AMI for a newer version of Teleport
• Copy /etc/teleport.yaml, /etc/teleport.d/ and /var/lib/teleport to the new instance, overwriting anything that already exists
• Backup the contents and copy them over to the new instance.
• Either restart the instance, or log in via SSH and run sudo systemctl restart teleport.service

Using Teleport with EKS

In this section, we will set Kubernetes RBAC permissions needed by Teleport and configure the EC2 instance running Teleport to map to those permissions.

Prerequisites

You’ll need a functioning EKS cluster, we recommend version 1.16. If you’re unfamiliar with creating an EKS cluster, view AWS EKS getting started guide.

• EKS Version: The below guide has been tested with Kubernetes 1.16
• eksctl. Make sure you have eksctl version 0.22.0.
• jq installed on your local machine.
• An AWS Account with Root Access

Create cluster role and role binding

The first step is to create a cluster role and role binding that will allow the Teleport EC2 instance to relay user requests to the Kubernetes API.

The below command is ran on a machine with kubectl access to the cluster.

$ cat << 'EOF' | kubectl apply -f -
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: teleport-impersonation
rules:
- apiGroups:
  - ""
  resources:
  - users
  - groups
  - serviceaccounts
  verbs:
  - impersonate
- apiGroups:
  - "authorization.k8s.io"
  resources:
  - selfsubjectaccessreviews
  verbs:
  - create
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: teleport-crb
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: teleport-impersonation
subjects:
- kind: Group
  name: teleport-group
EOF

If successful the terminal should output:

# clusterrole.rbac.authorization.k8s.io/teleport-impersonation created
# clusterrolebinding.rbac.authorization.k8s.io/teleport-crb created

Create IAM trust policy document

This is the trust policy that allows the Teleport EC2 instance to assume a role.

$ cat > teleport_assume_role.json << 'EOF'
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Service": "ec2.amazonaws.com"
      },
      "Action": "sts:AssumeRole"
    }
  ]
}
EOF

This will create a .json file locally, the below command should then be run to create the role.

$ aws iam create-role --role-name teleport-role --assume-role-policy-document file://teleport_assume_role.json

Create IAM policy granting list-clusters and describe-cluster permissions (optional)

This policy is necessary to create a kubeconfig file using the aws eks update-kubeconfig command. If you have another mechanism to create a kubeconfig file on the instance that runs Teleport, this step is not required.

cat > teleport_eks_desc_and_list.json << 'EOF'
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": [
                "eks:DescribeCluster",
                "eks:ListClusters"
            ],
            "Resource": "*"
        }
    ]
}
EOF
POLICY_ARN=$(aws iam create-policy --policy-name teleport-policy --policy-document file://teleport_eks_desc_and_list.json | jq -r '.Policy.Arn')
aws iam attach-role-policy --role-name teleport-role --policy-arn $POLICY_ARN

Map IAM role to Kubernetes group

This maps the IAM role teleport-role to the Kubernetes group teleport-group.

!!! note

If you used eksctl to create your cluster, you may need to add the mapUsers section to the aws-auth ConfigMap before executing these commands.

```
eksctl create iamidentitymapping --cluster [cluster-name] --arn arn:aws:iam::[account-id]:role/teleport-role --group teleport-group --username teleport
```

ROLE="    - userarn: arn:aws:iam::[account-id]:role/teleport-role\n      username: teleport\n      groups:\n        - teleport-group"
kubectl get -n kube-system configmap/aws-auth -o yaml | awk "/mapRoles: \|/{print;print \"$ROLE\";next}1" > /tmp/aws-auth-patch.yml
kubectl patch configmap/aws-auth -n kube-system --patch "$(cat /tmp/aws-auth-patch.yml)"

To check, run kubectl describe configmap -n kube-system aws-auth

Installing Teleport

Create EC2 instance

Create an EC2 instance using the Teleport Community AMI on a public subnet in your VPC. Modify the security group associated with that instance to allow port 22 inbound, so you can SSH to the instance after it’s running. You will need security group rules to allow access to ports 3080 and 3022-3026 so that users can access the Teleport server from the Internet.

This will allow GitHub to post a response back to the Teleport server. You’ll need to open port 80 to allow Let’s Encrypt to complete HTTP validation when using SSL certificates/unless you provide pre-provisioned TLS certificates.

Type	Protocol	Port Range	Source
Custom	TCP	3022-3026	0.0.0.0/0
Custom	TCP	3080	0.0.0.0/0
HTTP	TCP	80	0.0.0.0/0
SSH	TCP	22	your IP

You must modify the EKS control plane security group to allow port 443 inbound from the Teleport security group, to allow your Teleport instance to communicate with the Kubernetes API.

Assign role to instance:

aws iam create-instance-profile --instance-profile-name teleport-role
aws iam add-role-to-instance-profile --instance-profile-name teleport-role --role-name teleport-role
aws ec2 associate-iam-instance-profile --iam-instance-profile Name=teleport-role --instance-id [instance_id]
# instance_id should be replaced with the instance id of the instance where you intend to install Teleport.

Install Teleport.

1. Download and Install Teleport
2. Setup systemd
3. Setup Teleport config file. sudo cp teleport.yaml /etc/teleport.yaml. An example is below.

{!examples/aws/eks/teleport.yaml!}

Download Kubectl on Teleport Server

Kubectl is required to obtain the correct kubeconfig, so Teleport can access the EKS Cluster.

Instructions are below, or can be found on AWS Docs.

# Download the Amazon EKS-vended kubectl binary for your cluster's Kubernetes version from Amazon S3:
curl -o kubectl https://amazon-eks.s3.us-west-2.amazonaws.com/1.16.8/2020-04-16/bin/linux/amd64/kubectl
# (Optional) Verify the downloaded binary with the SHA-256 sum for your binary.
curl -o kubectl.sha256 https://amazon-eks.s3.us-west-2.amazonaws.com/1.16.8/2020-04-16/bin/linux/amd64/kubectl.sha256
# Check the SHA-256 sum for your downloaded binary.
openssl sha256 kubectl
# Apply execute permissions to the binary.
chmod +x ./kubectl
# Copy the binary to a folder in your PATH. If you have already installed a version of kubectl, then we recommend creating a $HOME/bin/kubectl and ensuring that $HOME/bin comes first in your $PATH.
sudo mv ./kubectl /usr/local/bin
# After you install kubectl, you can verify its version with the following command:
kubectl version --short --client

Create kubeconfig:

aws eks update-kubeconfig --name [teleport-cluster] --region us-west-2
# Added new context arn:aws:eks:us-west-2:480176057099:cluster/teleport-eks-cluster to /home/ec2-user/.kube/config

Creating TLS certificate for Teleport

Create TLS certificate for HTTPs. It is absolutely crucial to properly configure TLS for HTTPS when you use Teleport Proxy in production. For simplicity, we are using Let’s Encrypt to issue certificates and simple DNS resolution.

However, using an Elastic IP and a Route53 domain name would be appropriate for production use cases.

Install certbot:

# Install the EPEL release package for RHEL 7 and enable the EPEL repository.
sudo yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
sudo yum install -y certbot python-certbot-nginx

Run Certbot

export TELEPORT_PUBLIC_DNS_NAME=[teleport-proxy-url]
echo $TELEPORT_PUBLIC_DNS_NAME
export EMAIL=[email-for-letsencrypt]

sudo certbot certonly --standalone \
             --preferred-challenges http \
                      -d $TELEPORT_PUBLIC_DNS_NAME \
                      -n \
                      --agree-tos \
                      --email=$EMAIL

Setup Github Auth

Run this on the Teleport EC2 Host, see Github Auth for more info.

export TELEPORT_PUBLIC_DNS_NAME="[teleport-proxy-url]"
export GH_CLIENT_ID="[github-client-id]"
export GH_SECRET="[github-oauth-secret]"
export GH_ORG="[github-org]"
export GH_TEAM="[github-team]"

cat > github.yaml << EOF
kind: github
version: v3
metadata:
  # connector name that will be used with 'tsh --auth=github login'
  name: github
spec:
  # client ID of Github OAuth app
  client_id: $GH_CLIENT_ID
  # client secret of Github OAuth app
  client_secret: $GH_SECRET
  # connector display name that will be shown on web UI login screen
  display: Github
  # callback URL that will be called after successful authentication
  redirect_url: https://$TELEPORT_PUBLIC_DNS_NAME:3080/v1/webapi/github/callback
  # mapping of org/team memberships onto allowed logins and roles
  teams_to_logins:
  - kubernetes_groups:
  # change this to restrict the access of users logging in via GitHub;
  # system:masters gives everyone full access to the entire cluster
    - system:masters
    logins:
    - github
    - ec2-user
    organization: $GH_ORG
    team: $GH_TEAM
EOF

Use tctl to create the github auth connector.

sudo /usr/local/bin/tctl create -f ./github.yaml

Testing Teleport & EKS Setup

➜  ~ tsh login --proxy=[teleport-proxy-url].practice.io:3080
If browser window does not open automatically, open it by clicking on the link:
 http://127.0.0.1:64467/54e5d06a-c509-4077-bf54-fb27fd1b8d50
> Profile URL:  https://[teleport-proxy-url].practice.io:3080
  Logged in as: benarent
  Cluster:      teleport-eks
  Roles:        admin*
  Logins:       github, ec2-user
  Valid until:  2020-06-30 02:12:54 -0700 PDT [valid for 12h0m0s]
  Extensions:   permit-agent-forwarding, permit-port-forwarding, permit-pty


* RBAC is only available in Teleport Enterprise
  https://gravitational.com/teleport/docs/enterprise

On your local machine test using kubectl get pods --all-namespaces

➜  ~ kubectl get pods --all-namespaces
NAMESPACE     NAME                       READY   STATUS    RESTARTS   AGE
kube-system   aws-node-56p6g             1/1     Running   0          5h28m
kube-system   aws-node-7dv5j             1/1     Running   0          5h28m
kube-system   coredns-5c97f79574-69m6k   1/1     Running   0          5h36m
kube-system   coredns-5c97f79574-dq54w   1/1     Running   0          5h36m
kube-system   kube-proxy-7w4z4           1/1     Running   0          5h28m
kube-system   kube-proxy-c5nv2           1/1     Running   0          5h28m

Running Teleport Enterprise on AWS

Most of this guide has been designed for OSS Teleport. Most of this guide also applies to Teleport Enterprise with a few extra notes around adding a license and getting the correct binary.

We've a few other resources for Enterprise customers such as our

• Running Teleport Enterprise in HA mode on AWS using Terraform
• Teleport Enterprise Quickstart

If you would like help setting up Teleport Enterprise on AWS, please mail us at info@gravitational.com

Teleport AWS Tips & Tricks

Generating labels from AWS tags

Labels can be a useful addition to the Teleport UI. Simply add some or all of the below to Teleport Nodes in etc/teleport.yaml to have helpful labels in the Teleport UI.

    commands:
      - name: arch
        command: [uname, -p]
        period: 1h0m0s
      - name: kernel
        command: [uname, -r]
        period: 1h0m0s
      - name: uptime
        command: [uptime, -p]
        period: 1h0m0s
      - name: internal
        command: [curl, "http://169.254.169.254/latest/meta-data/local-ipv4"]
        period: 1h0m0s
      - name: external
        command: [curl, "http://169.254.169.254/latest/meta-data/public-ipv4"]
        period: 1h0m0s

Create labels based on EC2 Tags.