Teleport also supports identity-based access for other AWS managed services such as Amazon RDS, Amazon EKS, and even RDP for Windows. A robust bastion host that goes beyond supporting only SSH for Linux hosts.While Teleport provides the same advantages of using a traditional bastion host, it has a number of advantages for securing your AWS infrastructure over the bastion host instances alone. This tutorial will describe how to create a bastion host in AWS using the open-source solution Teleport. To understand why this approach is important to improve infrastructure access security, read our blog on why you still need a bastion host for more details. The bastion host or jump server provides secure access to private instances by limiting the exposure from public IPs. To access and manage Amazon EC2 instances running in a private subnet, a bastion host is deployed in the public subnet. For example, a database backend is typically provisioned within a private subnet while web servers connected to a load balancer are launched in a public subnet. One of the best practices for running secure workloads on Amazon Web Services is to isolate the instances into private and public subnets of a Virtual Private Cloud (VPC). In subsequent tutorials, we will explore topics such as IAM joining, accessing services across availability zones of the AWS cloud, managing access with multiple AWS accounts, and more. In the first part of the series, we will explore how to replace a traditional bastion host with a secure Teleport proxy and authentication server. Part 1: Protect AWS ec2 SSH access with Teleport as a bastion host. We will demonstrate these use cases using Teleport, an open-source, identity-based access solution that unifies access for AWS services such as EC2, RDS, EKS, and more. This multi-part tutorial will show how DevOps teams can secure their AWS services using a zero-trust, identity-based approach that not only increases security, but improves developer productivity. Protecting these mission-critical applications from potential attacks requires moving beyond typical security approaches such as using only a jump box or firewall to control access. However, since the targets do not have a public IP address at all in this case, you still need to use a bastion host, so there is connectivity to and from them.More and more business-critical applications run on Amazon Web Services. This could be much simpler if your target instances are not fussy about where you connect from and how many keys you present during authentication. Accessing a host without a public IP through the Bastion Ssh -J you manage to lock yourselves out of a DiscrimiNAT instance due to repeated authentication failures, either terminate the instance and let the AutoScaling Group bring back a new one, or wait 15 minutes. Ssh -J example of a fully formed command from the example deployment in the screenshots is: You will need the public IP address of the bastion, the private IP address of the target DiscrimiNAT instance, and this command: within the VPC), so you cannot connect to it from a public IP. This is needed because DiscrimiNAT will only allow SSH connections from private IPs (i.e. The username to use for login will depend on the Linux image chosen for this function.Ĭontact our DevSecOps Support for help with the usernames.įinally, SSH into the DiscrimiNAT instance using the bastion host as ProxyJump. To add a specific private key to the SSH Agent, run the command:Īnd then check with ssh-add -L whether only one line in the output is present. ssh directory in your home directory for unexpected private key files. If the previous command still shows some lines, check the. If the output shows more than one line, you may clear all of them out with the command ssh-add -D. So it's safer to just have the one identity that will work. This is to prevent it from trying one identity after another to the server, causing the server to block the user after too many failures. The SSH Agent should have only one identity loaded. Let's check with a few commands on your machine: Therefore, SSH access to it requires your posture to be sound and secure. The DiscrimiNAT image is hardened per CIS Benchmark for Ubuntu Linux 18.04 LTS Benchmark v1.0.0 Level 2 Server. If DiscrimiNAT was deployed via the provided CloudFormation templates or Terraform modules, an SSH Key Pair should've been set at that stage otherwise, you won't be able to authenticate into its instances.
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