![]() ![]() document-name AWS-StartPortForwardingSessionToRemoteHost \ With a command like the following, we create a tunnel from your computer passing through the bastion host, directly to the RDS instance into the correct port. In this case, we will use AWS-StartPortForwardingSessionToRemoteHost which reflects exactly the action we need. The most powerful components of the tool are the System Management Documents which describe actions that can be performed inside the managed system. Can you see where are we going with it? It just requires to have the SSM Agent installed into the bastion host and all inbound ports closed by the security group. This tool has CLI connection capabilities similar to those already provided by SSH, but without the downsides of requiring inbounds ports open nor maintenance of key pairs. And needless to say that IAM creation permissions should not be granted to anyone.Īlso, we will use the SSM console access feature provided by the AWS System Manager Session Manager tool. To bring temporary access key id and its correspondent secret access key from the SSO service we use SAML2AWS. It is very important to do not use IAM users. A better approachĪ respected company must have SSO access to authorize users into AWS accounts with very specific roles. And if it fails, the person will still have access to the database instance. What happens when that user finishes her services with the company? Those keys need to be removed from every bastion host and any other key she had contact with its correspondent private key must be rotated. We know every key must be rotated periodically and the comply of this security measure depends on humans therefore, it is very common that you find very old keys which are still in use.Besides the host, the user and the database password she needs to have the private keys that matches the public keys of the bastion already configured.The user uses some database client software that can manage tunneling, or creates the tunnel manually right before the SQL connection and engage the task.The SSH server requires public keys of the users that will connect to it.This bastion has an Ubuntu or an Amazon Linux, and the 22 port open to an SSH server.It can even be turned on and off to save some money. A bastion host instance is added into the same subnet like the backend instances but with a very small instance size.The most common scenario is something like this: The daily basis tasks requires to get connected to the database to tweak some data, so how do we do that? The way the backend is connected with the frontend would vary a lot, so to simplify it, lets just put an arrow from users. It means the database is inside a private subnet that can be accessed only by the backend. If we add some fences, it looks more like this. However, you can think of many scenarios/use cases, where developer needs to access the databases from outside the VPC, for example: for development/debug purposes, the access from the local developer machine is needed. no access to/from the internet by default, and the only allowed inbound access is from the deployed application in the same VPC. What scenario do we have?įollowing best practices, database must always be inside the private subnet, i.e. Interesting, right? Keep reading to know more. The title might sounds weird because, how it is supposed to connect to an SQL service without a port, right? Well the catch is that there IS a port, but it is not an inbound port, therefore nothing is exposed. ![]()
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