![]() ![]() This way, they can also connect to the target service through the port open on your computer, so what then? The solution is to use the gateway mode ( -g) and your colleagues will be grateful: Let’s consider your willing to contribute to others: you decide you want to share the connection you have created through the SSH tunnel with other computers connected to the network. Since this port is associated to the loopback interface (127.0.0.1), it will only be accessible from your own computer in which the SSH tunnel has been run. $ sudo ssh -L 80::80 establishing the SSH tunnel, you can connect to the target service through the port that you have specified as parameter, which is open on your computer (localhost). ![]() $ ssh -L 54321::5432 Connection from port 80 of your computer to a web service protected by IP whitelist, through a server with access to that service # Connection from port 54321 of your computer to internal RDS instance with PostgreSQL, through a public EC2 instance with access to the RDS instance Well, as simple as using the intermediate server as a hop machine via the following SSH tunnel: Surely on more than one occasion you have seen it for yourself in some similar situation to the aforementioned, or if you have wanted to request a web service protected by IP whitelist from the network where your computer is connected, whose public IP is not included in that list, knowing that you have SSH access to an intermediate server whose public IP is contained in the whitelist. If you have ever seen yourself in this kind of trouble, then I encourage you to continue reading since you will find the weapons you need to become a true ninja of the tunneled connections in this post.īelow are the most frequent use cases we can deal with, presented from the least to the greatest complexity. What has not happened, for instance, to have wanted to connect from a client installed on its computer to a remote database, which did not have a direct connection but does through another intermediate server (for example a bastion host)? Information security established as best practice, that accesses between different platform components or system must be implemented using the principle of least privilege. Tutorial and script to use SSH tunneling like a ninja. Hostname ec2-y.y.y.y. Tunneling | Tutorial and script to use SSH tunneling like a ninja SSH Tunneling Tutorial and script to use SSH tunneling like a ninja View on GitHub SSH Tunneling ![]() I've read this interesting document: but in that case we would need to create an SSH tunnel each instance we want to connect and keep track of the local ports, I don't think it's feasible if we want to connect to a remote instance on the fly like we do now with this ssh config: Host bastion So I'm thinking to something like this:ĬLIENT-ssm_session-BASTION-ssh-INSTANCE SSH TUNNEL THROUGH BASTION HOST INSTALLWe would like to get rid of SSH of course, but we still want to use the bastion to connect to the instances, since for a number of reasons we can't/don't want to install the SSM agent on them. Something like this: CLIENT-ssh-BASTION-ssh-INSTANCE We currently have a classic setup with a SSH bastion host and a bunch of instances we connect to through this bastion host. ![]()
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