Note: It is a best practice to harden your bastion host because it is a critical point of network security. You configure the solution by running commands at launch as the root user on an Amazon Linux instance. This blog post’s solution for recording SSH sessions resides on the bastion host only and requires no specific configuration of Linux instances. What matters is that the bastion host remains the only source of SSH traffic to your Linux instances. For example, you could have the bastion host in a separate Amazon VPC and a VPC peering connection between the two Amazon VPCs. You can adapt this architecture to meet your own requirements. Bastion host users connect to the bastion host to connect to the Linux instances, as illustrated in the following diagram. Linux instances are in a subnet that is not publicly accessible, and they are set up with a security group that allows SSH access from the security group attached to the underlying EC2 instance running the bastion host. The bastion host runs on an Amazon EC2 instance that is typically in a public subnet of your Amazon VPC. Later in this post, I provide instructions about how to implement and test the solution.Īmazon VPC enables you to launch AWS resources on a virtual private network that you have defined. In this section, I present the architecture of this solution and explain how you can configure the bastion host to record SSH sessions. Recording SSH sessions enables auditing and can help in your efforts to comply with regulatory requirements. In this blog post, I will show you how to leverage a bastion host to record all SSH sessions established with Linux instances. For example, you can use a bastion host to mitigate the risk of allowing SSH connections from an external network to the Linux instances launched in a private subnet of your Amazon Virtual Private Cloud (VPC). Because of its exposure to potential attack, a bastion host must minimize the chances of penetration. Port forward to the db host.A bastion host is a server whose purpose is to provide access to a private network from an external network, such as the Internet. Tunnel goes up to the host db access via the proxy command.Įncapsulated in the tunnel runs plink and establishes the The connection looks like the ASCII art below. The comments, agent forwarding must be enabled on the bastion hosts to ![]() Host and have the appropriate keys loaded. L 6035:DBHOST:3306 For a password less login peagent must be running on the desktop With the -nc option to create a tunnel up to the db access host.įor your topology the command executed on desktop machines this on theĬommand prompt looks like this: plink -A ^ ![]() It doesĮxecute a local command and uses it as a proxy. Unfortunately there is not much help for the -proxycmd option. Using this new functionality yields a more robust less L $ the release of PuTTY 0.68 plink got a new command line optionĬalled -proxycmd. I am looking for a putty/plink solution for use for access from windows boxes. I am able to connect to it with ssh from my Mac (code shown below), so I know that the current configuration of the boxes permits this kind of access. What is the (probably very lengthy) putty and/or plink command line that will enable this?įrom my interpretation of the manual, I've tried this: plink -ssh -2 -i C:\temp\key.ppk -agent -A -t -l user -L 6035:127.0.0.1:6035 ssh -v -L 6035:DBHOST:3306 gets me to the bastion, but it then looks for a private key on the bastion to make the connection to db access. ppk files for the private keys that the script can refer to. To make this as easy to deploy as possible, I want to specify all the configuration on the command line without referring to any saved session data configured in the Putty UI. My co-workers will then use this connection in a desktop db query tool. I need to write a script for some co-workers to connect over the following topology, using a private key for authentication (the same key for each person works on both bastion and db access): ┌────────────┐ ┌────────────┐ ┌────────────┐ ┌────────────┐
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