![]() The computer generally hosts a single application, for example, a proxy server, and all other services are removed or limited to reduce the threat to the computer. □ ~ Sourabh Step 1: Set up Linux Bastion HostĪ bastion host is a special-purpose computer on a network specifically designed and configured to withstand attacks. Messing with SSH is good, only genius people can able to lock themselves out of servers. The instructions may work for other flavors of Linux but is intended for Ubuntu 16.04 LTS. Also, It will help you to understand how to define security and access policies to your production environments. This post will walk you though some of the options available to harden OpenSSH. Log each and every activity performed by user on servers.Use Multi Factor Authentications (MFA).Prevent your production servers from exposing it to public networks.Under Node Management in the AWS Systems Manager navigation menu, browse to the Session Manager console and start a session on the Windows instance.What if your servers are open to a public network and unauthorized tunneling occurred ? or if someone used rm -rf command and accidentally deleted your project root directory on production but you don't have any clue what just happened? Follow the steps below to create a new Remote Desktop user in the windows instance:Ī. You can skip this step of creating windows local users if your EC2 instance is joined to an Active Directory domain, this will be your Active Directory credentials. This can be achieved using the below SSM command : aws ssm start-session -target -document-name AWS-StartPortForwardingSession -parameters “localPortNumber=55678,portNumber=3389” 3- Create a Windows OS user The user can then use any RDP client to connect to the forwarded port on their local machine to access the instance in AWS. This allows a user to forward the traditional Remote Desktop Protocol (RDP) port (3389/tcp) to an available port on their local machine (e.g., 55678/tcp). With port forwarding, you can forward a port on a remote instance to a port on your local machine. You can tunnel Remote Desktop Protocol (RDP) using the port forwarding feature of session manager to get access to the remote Windows instance without opening an inbound port 3389 (default RDP port) on the remote instance. The article will show you how to securely use the SSM agent along with the Systems Manager API to use port forwarding via a tunnel to connect into your private Windows EC2 instance without running bastion hosts/jump boxes and without opening any inbound ports to the instance. The SSM Agent is pre-installed onto the Windows Server 2016/2019 AMIs. Session Manager removes the need to open inbound ports, manage SSH keys, or use bastion hosts.ĪWS SSM uses the Systems Manager Agent (SSM Agent) on the instance to initiate a connection between the instance and the host’s machine. The latest version of the Session Manager Plugin for the AWS CLI installed on your local machine.ĪWS Systems Manager Session Manager is a new interactive shell and CLI that helps to provide secure, access-controlled, and audited Windows and Linux EC2 instance management.AWS CLI installed and configured on your local machine.SSM Agent installed and running on the instance.An IAM instance profile assigned to the instance that has the AmazonSSMManagedInstanceCore managed policy attached (or similar permissions).An EC2 instance with internet connectivity (via NAT gateway) or in a subnet that has VPC endpoints configured for SSM. ![]() The following sections are included in this article:ġ- Prerequisites 2- AWS Systems Manager (SSM) 3- Create a Windows OS user 4- RDP to EC2 instance 5- Summary 6- References 1- Prerequisites In this article, I’ll introduce the use of AWS SSM and tunnel RDP using the port forwarding feature of session manager to get access to the remote Windows instance. To remove the burden of a bastion host, AWS provides AWS Systems Manager (SSM) that allows you to securely connect to your EC2 instances, without the need to run and to operate your own bastion hosts and without the need to run SSH on your EC2 instances. To connect to your EC2 instance, you first Remote Desktop Protocol (RDP) into the bastion host and, from there, to the destination EC2 instance. Bastion is a special purpose EC2 instance designed to be the primary access point from the Internet and acts as a proxy to the other EC2 instances. Traditionally, we require a bastion host for connecting EC2 private instances for secure connection or to reduce the surface of an attack, AWS recommends using a bastion host, also known as a jump host. Secure RDP to EC2 Private Instance Using AWS SSM Introduction
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