1/4/2024 0 Comments Ssh bastion hardeningIn short it is intended to breach the gap between two security zones. In other words, it is an intermediary host or an SSH gateway to a remote network, through which a connection can be made to another host in a dissimilar security zone, for example a demilitarized zone (DMZ2). It is then possible to jump from this host to greater security zones. Therefore, a SSH bastion host is a server inside a secure zone, which can be accessed from a less secure zone. Sometimes called a SSH Jump host, or SSH Jump Server ssh gateway or a relay host, it’s simply a server that all of your users can log into and use as a relay server to connect to other Linux servers, Routers, Switches and more. What is an SSH Bastion Host?Īn SSH Bastion host is simply a single, hardened server that you “jump” through in order to access other servers or devices on the inner network. This need led to the emergence of the SSH Bastion host concept. More so, is the need for multiple manage SSH access to the company’s Linux servers, Routers, Switches, while meeting regulatory and security compliance. You cannot use NAT Gateway.In recent times, there is an increasing need for organizations to give employees access to their IT facilities due to the ongoing Covid restrictions ( such as work from home ) in place and in other cases grant access to external parties like clients, vendors who want to troubleshoot and fix issues with the IT Infrastructure remotely. If you SSH or RDP to an instance in a private subnet, you need to configure a Bastion host. You cannot use NAT Gateway as a Bastion host.Bastion hosts are also known as jump boxes in Australia. A Bastion host is used to to administer EC2 instances using SSH or RDP securely.It provides security by reducing the attacks on your infrastructure.Bastion Host is launched in Public subnets and acts as a proxy to the instances in a private subnet.Hardening a Bastion host reduces the surface area that we want to harden. We need to harden the Basten host and harden the Basten host as strong as possible, then we do not have to worry about hardening our instances as long as Bastion host is hardened. Bastion server creates a connection to a private EC2 instance through SSH or RDP. It is going through internet gateway, router, route table, network ACL, security group, and finally to the Bastion server. We have got SSH or RDP where SSH is for Linux and RDP is for windows. Now, if we want to administer an environment, what typically happens?. When an instance in a private subnet wants to access the internet, they do so either by NAT instance or NAT Gateway. NAT instance exists behind the security group, and NAT Gateway exists after the security group as NAT instance is configured with the security group while NAT Gateway does not require any security group and it is also redundant. In the above architecture, we have public and private subnet. A Bastion host is hardened due to its location and purpose, which is either on the outside of a firewall or demilitarized zone, i.e., public subnet and it usually accesses from untrusted networks or computers. The computer hosts a single application, for example, a proxy server and all the other services are removed to reduce the threat to the computer.A Bastion Host is a special purpose computer on a host designed and configured to withstand attacks.
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