![]() ![]() We have a supplementary script burrmill-ssh-Prox圜ommand, which attempts to locate the host name you pass in ssh command line from multiple sources. Another is that you need to pass the command the zone name (you can have the default zone set in the local configuration on any given machine), but I wanted something more flexible. I do not know about you, but I am very meticulous when it comes to managing the SSH keys kept on all machines I use, and for this task am grouping the keys and other files together. For one, it may create an SSH key for you. gcloud compute ssh is convenient but has its own drawbacks. It’s not documented but is not likely to go away: gcloud compute ssh uses this command internally, and it has to persist in one for or another. If you peeked at the documentation page liked to above, and wonder which of the two options we use: the third. If you add other accounts but do not grant them the Project Owner role, you’ll need to grant them access to tunneling, but this goes beyond our current walkthrough. As long as you are authenticated the Cloud SDK, you, as the owner of your project, are automatically granted access to the tunneling feature. ![]() We created a firewall rule to allow this IP range to connect to the SSH port 22 to any instance on the network. Connections are established from a narrow range of IP addresses, guarded by Google, so that you do not need commonly used “bastion hosts” to protect your network. ![]() To access machines inside, GCP offers an option of Identity-Aware Proxy (IAP) Tunneling. None of the VMs on your network are accessible from the Internet: this is the default firewall settings, and we did not open any ports to the whole world. Roles/iap.tunnelResourceAccessorto a user if the Access List evaluates to true (Eg.In this part we’ll go through IAP tunneling feature of GCP, OS Login and its key management, and some ideas of SSH setup that will make connecting to the cluster easier. Resource "google_compute_instance" "my-instance" Create the conditional IAM policy assigning the role With all this in place, we will be able to securely establish a remote access connection!Ĭreate a Linux VM in the project and enable OS Login # Create an instance This will require a firewall rule in the VPC allowing incoming connections to the VM from the IAP servers subnet. Once the user has been authenticated and had their IAM policy checked to ensure the user is authorised to access the service, the next step is to make a connection from the IAP servers to the VM. In this case, we will be using a conditional IAM role whereby the incoming connection will be checked against an Access List (Access Context Manager) to ensure that the IP address range the client device is on is within the range specified and if this evaluates to true the user will be granted the required role: roles/iap.tunnelResourceAccessor (The IAP servers sit in this IP address range 35.235.240.0/20) Then GCP will check the IAM policy to see if it user has the required permission ( roles/iap.tunnelResourceAccessor) to establish an IAP tunnel to the IAP servers. What this command will do, is to first attempt to authenticate the user to GCP. Gcloud compute ssh \ -tunnel-through-iap -project = \ -zone = We will use Google’s IAP (Identity Aware Proxy) service to provide authentication and then leverage Google’s conditional IAM policies with an ‘Access Level’ defined in Google’s Access Context Manager to restrict access to a specific region, source IP address or IP address range.įirst, we will run through the problem, some simple diagrams to illustrate it, and finally, how we will go about using Google’s services mentioned above to solve the problem.Īt the end of the post will be some example Terraform code that will show how to create the resources required for this solution. This will enable you to establish secure remote access to VM’s over protocols such as SSH, RDP or VNC.Īs part of this process, we will use also use a conditional IAM policy that will ensure that access to the VM is secured based upon the source IP address range. This post will detail how to create a secure IAP (Identity Aware Proxy) tunnel to a VM (Virtual Machine) inside a VPC without requiring a public IP address or VPN
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