![]() Check out the cookbook for really good examples. Combining hosts, using different keys, whatever. There are lots of ways you can combine options to suit nearly any workflow. The simplest method is like this: ssh -o Prox圜ommand='ssh -W %h:%p make this easier (and to make it also work for other tools like scp or rsync), you can edit your ~/.ssh/config file to define the proxy command and other params. In other words, the SSH connection is still started on your computer and terminated at the target the bastion becomes just a proxy. This example shows the prompt from PuTTY's pageant. The user is prompted for the passphrase to unlock the private key. The agent, rather than ssh itself, opens the user's private key and discovers that it's protected by a passphrase. This is where you connect via SSH to the bastion host, and then open another SSH connection from your computer to the target server through the bastion. The ssh client receives the key challenge, and forwards it to the waiting agent. So the better option I’ve found is to use SSH proxying. With agent forwarding on in clients, an SSH bastion does far more harm than good. If you have more than a few keys, then this tends to result in failures because many hosts auto-disconnect you after too many attempts. Similar to SSH tunnels, port forwarding enables you to forward traffic. One other problem is that with ssh forwarding, the agent just dumbly attempts every key, one by one. If your bastion host were ever compromised, then an attacker could use it to gain access to anything else you connected to. The most common or “popular” is to use an SSH agent with ssh forwarding. There are a few solutions to this problem. Having a single bastion server with the keys to the castle is a pretty big risk. This presents a problem: Your bastion server needs the keys to any internal server. You > Bastion > Serverįor the best security, you typically have SSH configured for key-only authentication. I have tested and the bastion host is able to connect to the internal host name on the Redis port.A bastion host is a server that sits on a public network whose sole purpose is to provide access to an inner private network.įor example, if you use AWS and have instances on a private VPC subnet, then the only way you can gain SSH access to them is to use a bastion host as a kind of proxy. The only difference is that, with the HostName parameter, the connection fails after ~2min instead of 15s. How can I reuse those values but also have a Host configured for when I want the tunnel? This answer seems to say that I should be able to just add HostName to the second Host and it should work, but I get the same error in that case. for this special case of tunneling to the Redis server. I don't want to have to duplicate all the HostName, IdentityFile, etc. ![]() However, it can still be useful to use different keys for different purposes as the article explains, by default, ssh presents all your public keys to the remote server so. I have no idea why it's complaining about that MAXINT port number… You can use SOCKS forwarding or static port forwarding in an ssh session to the bastion host, then a Prox圜ommand option to tell the second ssh to tunnel over the first ssh. This assumes a further config file on the bastion to define host private from there. Kex_exchange_identification: Connection closed by remote host The only way around this Ive found is to abandon the Prox圜ommand and use a 2 step ssh like so, extending the direct Host section for the bastion itself. This doesn't work, and fails with: channel 0: open failed: connect failed: Temporary failure in name resolution You connect to the Bastion server using the SSH key bastion.pem You connect to the Application server using the SSH key app.pem Both SSH keys are stored on the home laptop. (I'm happy to devote a terminal tab to it, although I will try -N -f to see if I prefer that.) The host name won't change, and the tunnel needs to go via the bastion. This works: ssh -L 6000::6379 bastionīut I want a config Host shortcut so I can just type ssh redis and have the tunnel set up. Now I have a Redis instance inside the firewall which I would like to forward a local port to. I am presently able to SSH to the bastion with ssh bastion using this in my ~/.ssh/config: Host bastion I have a publicly-accessible bastion host.
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