SSH's AllowTCPForwarding option must be set to yes for this to work-and that's the default. I pay $5/month for it, use it to host some websites, and it also gets assigned a static public IP address, so I can point a domain at it, like On that VPS, I needed to configure SSH so it could work as a tunnel server: So I chose to use one of my existing DigitalOcean VPSes for the task. Sometimes they are easier for specific needs, but as I mentioned, I just wanted two open ports. Paid services like VPNs and ngrok run their own servers, but can cost upwards of $10-20/month if you want to run a lot of traffic through them. You're responsible for your own security, and if you don't have a good grasp on fundamental Linux and SSH security, you might not want to do this. Security Warning: Punching a hole through to any network-especially to expose something like a Raspberry Pi to the public Internet, increases your network's attack surface. There are a few different ways people have traditionally dealt with accessing devices running through CG-NAT connections:Īnd after weighing the pros and cons, I decided to go with option 3, since-for my needs-I want to have two ports open back to the Raspberry Pi: What this means is there's no publicly routable address for the Pi-you can't access it from the public Internet, since it's only visible inside the cell network's private network. This modem is on AT&T's network, but regardless of the provider, unless you're willing to pay hundreds or thousands of dollars a month for a SIM with a public IP address, the Internet connection will be running behind CG-NAT. You can replace ssh-pool with any name.For a project I'm working on, I'll have a Raspberry Pi sitting behind a 4G LTE modem: Next, create a new Tunnel with the following command. Cloudflare Tunnel, powered by its cloudflared daemon, will create an outbound-only connection from your environment and send SSH connections from users to protected resources once authorized.įirst, install and authenticate an instance of cloudflared in a location that can address the resources you are connecting to Cloudflare. You can now connect the host to Cloudflare with Cloudflare Tunnel. In this case, the group specified includes rules that enforce Okta group membership and country location. You can use Access Groups to build reuseable policies. This will be the host that users configure in their SSH configuration file to reach the protected resources.īuild a policy to determine who will be able to reach these resources. Name the application using a subdomain of a domain active in your Cloudflare account. In the Zero Trust dashboard, open the Applications page of the Access section. Building the Zero Trust policy first ensures that resources are not connected to Cloudflare for a period of time before a Zero Trust policy can be added. Change your domain nameservers to Cloudflare External link icon Open external linkįirst, build a Zero Trust policy to enforce rules whenever any user attempts to connect to the resources being protected.Replace long-lived SSH keys with short-lived certificates to authenticate users to the host.Build Zero Trust rules to protect that resource.Connect a host to Cloudflare’s network that users can reach over SSH.Users do not have to add SSH keys to their onboarding instead, only the identity provider is required.The keys used to authenticate are automatically rotating.Revocation at the identity provider extends to SSH key.API keys are not left lingering on machines.Replacing long-lived API keys with short-lived certificates offers the following advantages: The certificates are generated from the user’s login to your identity provider and will authorize the user to the SSH server. Cloudflare’s network will enforce Zero Trust rules and prompt users to authenticate with your organization’s identity provider and multifactor options.Īdditionally, Access can help your team replace long-lived SSH keys with short-lived certificates External link icon Open external link. Cloudflare Access can secure resources that users connect to over SSH.
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