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Version: 16.x

AWS Cross-Account Database Access

You can deploy the Teleport Database Service with AWS IAM credentials in one AWS account and use an AWS IAM role to grant Teleport access to databases in another AWS account.

AWS cross-account database access is available starting from Teleport 13.0.

When the Teleport Database Service needs to discover, configure, or retrieve short-lived authentication tokens for AWS databases, it uses credentials for an AWS IAM identity to make requests to the AWS API. To access resources across AWS accounts, you can configure the Teleport Database Service to assume an AWS role in another account before it uses the AWS API for further actions.

This is not limited to a single AWS role: the Teleport Database Service can be configured to connect to databases in its own AWS account and multiple external AWS accounts at the same time.

You will need to configure the Teleport Database Service to assume an AWS IAM role and ensure that AWS IAM permissions are configured to allow the sts:AssumeRole call.

note

You should also check that your network configuration in AWS allows the Teleport Database Service to connect to the databases.

This guide does not cover AWS network configuration, because it depends on your specific AWS network setup and the kind(s) of AWS databases you wish to connect to Teleport. For more information, see how to connect your database.

Teleport configuration​

The Teleport Database Service must be configured to assume an external AWS IAM role and, optionally, pass an external ID when it assumes that role. The configured AWS IAM role will be assumed via an AWS STS AssumeRole call before the Teleport Database Service uses the AWS API to discover, configure, or retrieve short-lived authentication tokens for AWS databases.

An "external ID" is used to address what AWS calls the confused deputy problem. When you configure the Teleport Database Service to use an external ID, it will include that external ID when it calls AWS STS AssumeRole. The external AWS IAM role's trust policy will be used to verify that the correct external ID was provided in the AssumeRole call. For information about when you should use an external ID, see: purpose of an AWS external ID.

AWS database discovery config, static database config, and dynamic database config all support the assume_role_arn and external_id settings.

Modify your Teleport Database Service configuration file to assume an external AWS IAM role when it is discovering AWS databases.

# This example configuration will discover AWS RDS databases in us-west-1
# within AWS account `222222222222` by assuming the external AWS IAM role
# "example-role".
db_service:
  enabled: "yes"
  aws:
    - types: ["rds"]
      regions: ["us-west-1"]
      assume_role_arn: "arn:aws:iam::222222222222:role/example-role"
      external_id: "example-external-id"

Restart the Teleport Database Service for the configuration file changes to take effect.

note

The AWS IAM role used to discover a database will also be used by the Teleport Database Service to provide access to that database.

Teleport AWS IAM identity​

In order to assume an AWS IAM role, the Teleport Database Service will need credentials for an AWS IAM identity of its own.

Grant the Database Service access to credentials that it can use to authenticate to AWS.

  • If you are running the Database Service on an EC2 instance, you may use the EC2 Instance Metadata Service method
  • If you are running the Database Service in Kubernetes, you can use IAM Roles for Service Accounts (IRSA)
  • Otherwise, you must use environment variables

Teleport will detect when it is running on an EC2 instance and use the Instance Metadata Service to fetch credentials.

The EC2 instance should be configured to use an EC2 instance profile. For more information, see: Using Instance Profiles.

Have multiple sources of AWS credentials?

Teleport's AWS client loads credentials from different sources in the following order:

  • Environment Variables
  • Shared credentials file
  • Shared configuration file (Teleport always enables shared configuration)
  • EC2 Instance Metadata (credentials only)

While you can provide AWS credentials via a shared credentials file or shared configuration file, you will need to run the Database Service with the AWS_PROFILE environment variable assigned to the name of your profile of choice.

If you have a specific use case that the instructions above do not account for, consult the documentation for the AWS SDK for Go for a detailed description of credential loading behavior.

AWS IAM permissions​

AWS IAM policies must be configured for both the Teleport Database Service's AWS IAM identity and the external AWS IAM role:

  • The Teleport Database Service's AWS IAM identity must have permission to assume the external role.
  • The external AWS IAM role's trust policy must trust the Teleport Database Service's AWS IAM identity.
Why are both required?

Unlike assuming a role within the same AWS account, when an AWS IAM role is in a different AWS account than the IAM identity that attempts to assume it, the role's trust policy alone is not sufficient to allow assuming the role.

For more details, see: AWS cross-account policy evaluation.

Database Service IAM policy​

Attach the following permission policy to the Teleport Database Service's AWS IAM identity:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "sts:AssumeRole",
            "Resource": "arn:aws:iam::222222222222:role/example-role"
        }
    ]
}

External AWS IAM permission policy​

You will also need to configure permissions for the external AWS IAM role, specific to the type of database(s) that it will be used to access.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "DocumentDBConnectAsIAMRole",
            "Effect": "Allow",
            "Action": "sts:AssumeRole",
            "Resource": [
                "arn:aws:iam::aws-account-id:role/DatabaseUserRole"
            ]
        },
        {
            "Sid": "DocumentDBCheckDomainURL",
            "Effect": "Allow",
            "Action": "rds:DescribeDBClusters",
            "Resource": "*"
        }
    ]
}
StatementPurpose
DocumentDBConnectAsIAMRoleAssume an IAM role to connect to a DocumentDB cluster with IAM authentication.
DocumentDBCheckDomainURLValidate a domain's URL if it was auto-discovered by the Discovery Service.

External AWS IAM trust policy​

Modify the external AWS IAM role's trust policy to allow the Teleport Database Service's AWS IAM identity as a trusted principal. If you require an external ID, provide a condition in the statement that allows the action only when the correct external ID is given.

For example, if the Teleport Database Service will be deployed to an EC2 instance with an attached role teleport-db-service in AWS account 123456789012, and you want to require an external ID to assume the external role, then the trust policy might look like:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "Statement1",
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::123456789012:role/teleport-db-service"
            },
            "Action": "sts:AssumeRole",
            "Condition": {
                "StringEquals": {
                    "sts:ExternalId": "example-external-id"
                }
            }
        }
    ]
}

Next steps​