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. Roles/iap.tunnelResourceAccessor (project or VM)įor complete reference you can check this documentation on IAP for TCP forwarding and Troubleshooting SSH.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 It is recommended granting the following roles for trusted administrators: You can also check you IAM to grant permission to use IAP TCP forwarding. Protocols and ports: Select TCP and enter 22 to allow SSH. On the Firewall Rules page, click Create firewall rule. You can also follow the steps below to allow SSH access on your VM instances: As you have mention from your firewall rules that their is port 22 for SSH as this is also a requirement to allow connection for SSH. This range will contain all the IP addresses that the IAP uses for TCP forwarding. You can allow IAP to connect to your VM instance by creating a firewall rule that will apply to all the VM instances that you want to be accessible using IAP. Note that this entire Google Cloud account was created solely for this project - so this is a brand new, plain vanilla account and instance.īased from the error message you are getting, the error 1006 appears in the GCP Console UI after 1 hour of inactivity of the SSH session via IAP with VMs using the Internal IP, and this is a session timeout on the Google side. Note that I'm using the GC account admin as the user. I've gone into the IAP configuration for the instance and confirmed that the principal I am connecting with is listed as an IAP Secured Tunnel user. Adjust the ingress firewall rule with the IAP IP address to allow all ports.Add an ingress firewall rule with the IAP IP address (there is already a firewall rule allowing port 22 traffic from all IP addresses, so I didn't think this would make a difference - but I tried anyway) - this did not make a difference.What I've tried so far based on suggestions below: I've deleted the instance and recreated it, and the behavior is the same. I can connect to the instance using the gcloud console. I have checked firewall rules, and there is an all-ip ingress rule for port 22. Then about 1 second later, the error screen flips to this:Ĭode: 1006 Please ensure you can make a proper https connection to the IAP for TCP hostname: You may be able to connect without using the Cloud Identity-Aware Proxy. You cannot connect to the VM instance because of an unexpected error. When I attempt to SSH using the web console, I the pop up window has an error: I created a new Google Cloud business account.
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