Riki Baruchel

And accessing them from a Node.js app…

If your application needs to SSH to an EC2 instance and run some shell commands, you will need to use the SSH Private Key to access the instance.

The question is where do you store the SSH Key? Would you store the SSH key alongside your code and commit it to your repository? With a public repository, you would be exposing your key to the world. But even if your repository is private you would be allowing the key to be retrieved by anyone that has access to the repository. The secure and recommended way to store the key is to use the AWS Secrets Manager where the SSH key would be stored encrypted and would only ever be retrieved and used by your application during run-time, and never written to disk.

Here are the steps to accomplish this:

#1 Create the Secret

In the AWS Management Console, navigate to the AWS Secrets Manager Service and click on Store a new secret.

Select ‘Other type of secrets’. Select the Plaintext tab and paste the SSH Key from your .pem file into the text area. (Make sure you clear the {“”:””} json format first; the JSON parser returns a token error if the key is stored in json format and parsed out in the code).

Leave the DefaultEncryptionKey to encrypt your SSH Key secret.

Give a name to your secret, add tags, leave the rotation disabled, and store the secret.

#2 Create the EC2 Instance role with the Secrets Manager Access Policy

You can create a custom policy instead, with access to the specific Secret instead of the generic role provided by AWS.

Click on Create.

#3 Attach the Role to the EC2 Instance host from where you will be running your applicationNavigate to the EC2 service, select your EC2 Instance, Actions, Instance Settings, Modify IAM role.

Select the EC2SecretsAccessRole that you created in the previous step and save it.

This EC2 instance will now have the permissions to access the Secret that you created.

#4 Create your application

The Node.js application will uses the ssh2 library and aws-sdk.

The EC2 instance we are connecting to is in the same VPC as the EC2 host where the Node.js application is running and has the necessary security rules in place.

You can fork the code for the application from the following GitHub repo: https://github.com/nil0blue/SecretsManagerSSHKey

Below is the output from a sample run:

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