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how to use teleport bot to issue certificate and save it into aws secret manager?

January 21, 2025 by walter

To use Teleport (a popular tool for secure access to infrastructure) to issue a certificate and save it into AWS Secrets Manager, follow these steps:

Prerequisites:

1. Teleport Setup: Ensure you have Teleport installed and configured. A Teleport bot must be running and properly authenticated to issue certificates.
2. AWS CLI: Ensure the AWS CLI is installed and configured with credentials that have permissions to access AWS Secrets Manager.
3. AWS Secrets Manager Permissions:
   • Ensure your IAM user or role has the necessary permissions to create secrets in AWS Secrets Manager.
     Example policy:

     {
     "Version": "2012-10-17",
     "Statement": [
     {
      "Effect": "Allow",
      "Action": [
        "secretsmanager:CreateSecret",
        "secretsmanager:PutSecretValue"
      ],
      "Resource": "*"
     }
     ]
     }

Steps:

Step 1: Use Teleport Bot to Issue a Certificate

Teleport bots can issue certificates using the tbot command-line tool. Run the following command:

tbot issue --output-dir=/tmp/certs

• --output-dir=/tmp/certs: Specifies the directory where the certificate files will be saved. Replace /tmp/certs with your preferred location.

The output directory typically contains:

• cert.pem: The issued certificate.
• key.pem: The private key.
• ca.pem: The Certificate Authority (CA) certificate.

Step 2: Combine the Certificate and Key (Optional)

Some tools require the certificate and private key to be in the same file. You can combine them:

cat /tmp/certs/cert.pem /tmp/certs/key.pem > /tmp/certs/cert-key-combined.pem

Step 3: Save the Certificate in AWS Secrets Manager

Use the AWS CLI to save the certificate and key into a secret in AWS Secrets Manager.

aws secretsmanager create-secret \
    --name "my-teleport-cert" \
    --description "Teleport issued certificate and key" \
    --secret-string file:///tmp/certs/cert-key-combined.pem \
    --region us-east-1

• --name "my-teleport-cert": Specifies the name of the secret.
• --description: Provides a description for the secret.
• --secret-string: Specifies the secret content.
• file:///tmp/certs/cert-key-combined.pem: Reads the combined certificate and private key from the file.
• --region us-east-1: Specifies the AWS region. Replace with your desired region.

Step 4: Verify the Secret in AWS Secrets Manager

To verify that the secret was saved correctly:

aws secretsmanager get-secret-value --secret-id "my-teleport-cert" --region us-east-1 --query SecretString --output text

Automating the Process

You can create a shell script to automate these steps:

#!/bin/bash

# Directory for storing certificates
CERT_DIR="/tmp/certs"
SECRET_NAME="my-teleport-cert"
REGION="us-east-1"

# Issue certificate using Teleport bot
tbot issue --output-dir="$CERT_DIR"

# Combine certificate and key
cat "$CERT_DIR/cert.pem" "$CERT_DIR/key.pem" > "$CERT_DIR/cert-key-combined.pem"

# Save to AWS Secrets Manager
aws secretsmanager create-secret \
    --name "$SECRET_NAME" \
    --description "Teleport issued certificate and key" \
    --secret-string file://"$CERT_DIR/cert-key-combined.pem" \
    --region "$REGION"

echo "Certificate saved to AWS Secrets Manager with name: $SECRET_NAME"

Make the script executable and run it:

chmod +x save_teleport_cert.sh
./save_teleport_cert.sh

Notes:

• Replace placeholder values (e.g., my-teleport-cert, us-east-1) with your actual values.
• If you want to update an existing secret instead of creating a new one, use the put-secret-value command:

  aws secretsmanager put-secret-value --secret-id "my-teleport-cert" --secret-string file:///tmp/certs/cert-key-combined.pem --region us-east-1

• Ensure that your Teleport bot configuration and AWS credentials are securely managed.

Let me know if you need further clarification!

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