However, once you have connected to your bastion host, logging in to your private instances from the bastion would require having their private keys on the bastion. This does not pose a problem when you are trying to connect to your bastion host from your local machine, as you can easily store the private key locally. SSH and RDP connections require private and public key access to authenticate. An easy way to do this is to populate the ‘Destination’ field with the ID of the security group you’re using for your private instances. Your outbound connection should again be restricted to SSH or RDP access to the private instances of your AWS infrastructure. You definitely want to avoid allowing wide open access (0.0.0.0/0). The inbound rule base should accept SSH or RDP connections only from the specific IP addresses (usually those of your administrators). Inbound and outbound traffic must be restricted at the protocol level as much as possible. Next, create a security group to be applied to your bastion host. Apply this group to all of your private instances that require connectivity. This SG should only accept SSH or RDP inbound requests from your bastion hosts across your Availability Zones (AZ). First, create a SG that will be used to allow bastion connectivity for your existing private instances. Security groups are essential for maintaining tight security and play a big part in making this solution work (you can read more about AWS security groups here). Deploy an AWS bastion host in each of the Availability Zones you’re using.Implement either SSH-agent forwarding (Linux connectivity) or Remote Desktop Gateway (Windows connectivity).Set up the appropriate security groups (SG).Launch an EC2 instance as you normally would for any other instance.Here are the basic steps for creating a bastion host for your AWS infrastructure: Instead, I would suggest that you look into hardening your chosen operating system for even tighter security. When designing the bastion host for your AWS infrastructure, you shouldn’t use it for any other purpose, as this could open unnecessary security holes. This diagram shows connectivity flowing from an end user to resources on a private subnet through a bastion host: You may ask yourself, do I need a bastion host in my environment? If you require remote connectivity with your private instances over the public internet, the answer is yes! When properly configured through the use of security groups and Network ACLs (NACLs), the bastion essentially acts as a bridge to your private instances via the internet. Once remote connectivity has been established with the bastion host, it then acts as a ‘jump’ server, allowing you to use SSH or RDP to log in to other instances (within private subnets) deeper within your VPC. What is a bastion host, and do I need one?īastion hosts are instances that sit within your public subnet and are typically accessed using SSH or RDP.
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