![]() Refer to the simple python example below. AWS provides the Simple Systems Manager (SSM) using which you can run commands on the EC2 instances. But in the case of AWS EC2 instances, the AWS SDK provides the ability to do so in their API. In a usual case, you would use a remoting library and connect via SSH to a remote machine, and execute commands. Remoting on machines in AWS works a little different. (NOTE: To allow access to a set of IPs in a private corporate network, you should setup VPN connection with the corporate data center, and allow access to only the system admin team’s IP address range).ĪWS Setup Bastion Host SSH tunnel AWS EC2 instance remote access using AWS SDK ![]() In this example, the access is open to all IP addresses, but in a real scenario, you should restrict the IP addresses who can access to a range of IP addresses which you know are white-listed. Bastion host needs to be accessible from the internet so the system admins can log in.If it’s not a default NACL, you will have to configure the NACL to allow access too.) (NOTE: Assumption here is that you are using the default Network Access Control List(NACL) for the subnets which allows all the traffic. The other accesses will still be the same for both security groups. As an alternative, you can have a security group for windows with only RDP port 3389 access, and another security group for linux with only SSH port 22 access. For this example, I have created one security group for both types of instances. ![]() Bastion host needs access to the SSH port 22 on linux server and RDS port 3389 on the windows server so that it can be used for remote access to these machines. Assuming that the web servers on these windows and linux machines are running on default ports, we need to enable public access to port 80.Say, for example, your windows and linux server instances in the private subnet are running a web server. Here, we have one VPC with a public and a private subnet. In this section, I will go over the architecture example shown in the picture below. For most IT applications, it is used for adding encryption to legacy applications, going through firewalls, and for opening backdoors into the internal network from their local network or corporate network machines. SSH tunneling or port forwarding is a mechanism in SSH for connecting application ports from the client machine to the server machine or vice versa. What is SSH Tunneling? or What is Port Forwarding vis SSH? System admins can use this machine to connect to other instances in the backend infrastructure via secure authentication mechanisms. This is usually a powerful server box with high network security as this is the only host which is allowed public access. The other common name used for a bastion host is ‘Jump Box’. In very simple terms, a bastion host is the only host or computer which is allowed public network access. In this post, I will go over some basics and show how you can access your backend infrastructure by SSH tunneling through a bastion host. Using a bastion host in such cases comes very handy, and is used very frequently. The AWS Shared Responsibility model requires you as a user to ensure that your resources and data are secure. A public cloud environment is different than a normal On-Prem environment as it has a greater possibility of getting hacked since it does not sit behind an IT-controlled firewall like in most corporate data centers. The database access should be limited to the developers and the instance level access only to the Administrators. At network or VPC level, you should consider a tiered approach wherein only the application layer or web UI console is accessible to the customers. To achieve that in AWS, you can use hardened AMIs allowing only controlled access at the OS and application level. In real scenarios of cloud deployment, it is recommended to secure the infrastructure with tight network security.
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