This should work even if root login has been disabled, since stunnel forwards the traffic to ssh and therefore it appears to SSH as local and not external traffic. Now you can test that your SSH connection is being forwarded via stunnel: See Stunnel/Client and Stunnel/Server pages for how to check if stunnel is operating correctly on client and server ends, respectively. Run stunnel on both machines, check that everything is operating correctly. # traffic will be decrypted and forwarded to local port 22 # stunnel server will listen for stunnel clients connecting on port 443 In this way, the SSH connection happens on an entirely different port from either 2222 (on the client) or 22 (on the server) - it happens on 443. This configuration will set up an stunnel server that listens on port 443 for stunnel client connections, and forwards any traffic received on to local port 22 (a local SSH service). # ssh -p 443 stunnel client connects to remote stunnel server at IP A.B.C.D over external port 443 Port 2222 (local ssh) -> Port 443 (stunnel client) Stunnel is a proxy designed to add TLS encryption functionality to existing clients and servers without any changes in the programs code. This guide will cover how to get an stunnel client and stunnel server to create an encrypted connection on an arbitrary port, and how to forward SSH traffic. This is a way to bypass firewalls that only accept HTTP and HTTPS traffic - wrap the SSH traffic in an HTTPS layer that the firewall can't inspect. The following sets up the client to listen for SSH connections on local port 2222, and forward them to port 443. No information about the server needs to be specified - the connection happens transparently on the networking layer. In that way, the client transparently sees: We will use a specific example here: the client wants to be able to SSH to a local port, say port 2222, and have this transparently forwarded to another local port on the server, say port 22. secondsĪug 08 19:04:32 login dhcpcd: ens18: adding route to 192.168.50.0/24Īug 08 19:04:32 login dhcpcd: ens18: adding default route via 192.168.50.1Īug 08 19:04:31 login stunnel: Binding service to 192.168.50.56:8443: Cannot assign requested address (99)Īug 08 19:04:31 login stunnel: Binding service failedĪug 08 19:04:31 login stunnel: Deallocating section defaultsĪug 08 19:04:31 login stunnel: Unbinding service Īug 08 19:04:31 login stunnel: Service closedĪug 08 19:04:31 login stunnel: Deallocating section Īug 08 19:04:31 login systemd: rvice: Control process exited, code=exited, status=1/FAILUREĪug 08 19:04:31 login systemd: rvice: Failed with result 'exit-code'.Īug 08 19:04:31 login systemd: Failed to start TLS tunnel for network daemons.This guide will cover how to get an stunnel client and stunnel server to create an encrypted connection on an arbitrary port, and how to forward SSH traffic from any local port on the client end through that encrypted tunnel and on to any local port on the server end. * After=syslog.target network.target > After=syslog.target network-online.target Using systemd stunnel service, stunnel starts before the network interface gets assigned an ip since =network.target is used instead of network-online.target in the service file
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