![]() Tailscale uses netstack port interception and just-in-time automatic configuration of the client known_hosts file to make ssh myhost work without any new binary or config file. Tailscale will only authorize the two devices to connect if the ACLs in the tailnet allow it. The SSH client and server will still create an SSH connection, but during the SSH protocol’s authentication phase, the Tailscale SSH server already knows who the remote party is and takes over, not requiring the SSH client to provide further proof (using the SSH authentication type none). With Tailscale SSH, Tailscale will authenticate and encrypt the connection over WireGuard, using Tailscale node keys. Normally, to establish an SSH connection, the local SSH client you use will connect to the SSH server on the machine you’re trying to reach. ![]() With Tailscale SSH, based on the ACLs in your tailnet, you can allow devices to connect over SSH and rely on Tailscale for authentication instead of public key authentication.Ĭompared to using SSH keys, using Tailscale SSH changes how authentication of your connections, key generation and distribution, and user revocation work. This routes SSH traffic for the device from the Tailscale network to an SSH server run by Tailscale, instead of your standard SSH server. When you enable Tailscale SSH, Tailscale claims port 22 for the Tailscale IP address (that is, only for traffic coming from your tailnet) on the devices for which you have enabled Tailscale SSH. Tailscale also knows your identity, since that’s how you connected to your tailnet. With Tailscale, you can already connect machines in your network, and encrypt communications end-to-end from one point to another-and this includes, for example, SSHing from your work laptop to your work desktop. This lets the server authenticate communication from the client. Historically, to secure an SSH connection, you generate a keypair on the machine you are connecting from (known as the client), with the private key stored on the client, and the public key distributed to the device you want to connect to (known as the server). Your SSH config ( /etc/ssh/sshd_config) and keys ( ~/.ssh/authorized_keys) files will not be modified, which means that other SSH connections to the same host, not made over Tailscale, will still work. This allows the user to access these high-risk applications for the next 12 hours or for a specified check period before re-authenticating again. Optionally require certain connections, or connections as certain users (e.g., root), to re-authenticate before connecting. Verify high-risk connections with check mode.The SSH client and server will still create an encrypted SSH connection, but it will not be further authenticated. ![]() Tailscale will authenticate and encrypt the connection over WireGuard, using Tailscale node keys. With Tailscale SSH, Tailscale takes over port 22 for SSH connections incoming from the Tailscale network.
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