1 Commits

Include renames

Author	SHA1	Message	Date
jaap-jan	82966af37b	Let a connection be reached through a proxy on this machine's loopback ... Step 1 of docs/reaching-a-host-you-cannot-dial.md, and it is not the step that document said it was. SshConnectionRequest carries an optional SshLoopbackProxy and BuildConnectionInfo hands SSH.NET its proxy ConnectionInfo when there is one. Nothing passes one yet: the callers are jump hosts and the relay, which are steps 2 and 3. ◆ THE BRIDGE WAS THE WRONG FIRST STEP, AND BUILDING IT WOULD HAVE BEEN THE MISTAKE THIS DOCUMENT IS ABOUT. ADR 0004 says the relay's loopback bridge "also provides ProxyJump via a SOCKS5 dynamic forward — one mechanism, two features", and the plan took that to mean the bridge was the shared foundation. It is not: ForwardedPortDynamic *is* the listener for a jump host — SSH.NET accepts on it, speaks SOCKS5 on it and tunnels through the bastion — so nothing is left for a bridge of ours to do on that path. The relay is the case with no SshClient to hang a forward off, so it is the bridge's only consumer, and the bridge belongs in the commit that uses it. What the two actually share is one level down and a tenth of the size: being told to reach a target through a loopback proxy while staying about the target. That is what this is. Three properties, one test each. A port and nothing else, so a proxy anywhere but loopback cannot be expressed. The failure that shape rules out is an open SOCKS proxy on the user's network for the life of a shell, which nothing would report — so it is made unrepresentable rather than validated, on the same grounds AuthenticationChoice carries a kind. SOCKS5 rather than a dumb pipe, which is what keeps host key pinning honest. The target's own name and port stay in the request, travel to the proxy in the CONNECT, and are what the gate pins — so a machine reached through a bastion is pinned under its own name instead of under 127.0.0.1 on whatever ephemeral port that day's forward got, which is not an identity at all. A pipe would have meant handing SSH.NET a stand-in and remembering everywhere else that it was one. And a proxy that is not listening fails as a connection error rather than as an unknown host key. The gate turns "no host key seen" into a fingerprint prompt, and a connection that never reached a server has seen none either; the prompt would offer to fix the wrong thing, with no fingerprint to show. TWO THINGS THE TESTS MEASURED RATHER THAN ASSUMED, both found by the first run failing. The target is resolved at the *bastion*, not here — a SOCKS CONNECT names it and the far end looks it up. So the test asks for localhost:2222, the address inside the container, and the published port this host would use means nothing there. That is not a quirk of the fixture; it is what ProxyJump means, and it is why an ssh_config writes the target's internal address beside its jump host. Getting it wrong is a SOCKS "general failure" that names neither end. And the test server refuses forwarding. linuxserver/openssh-server ships AllowTcpForwarding no, which a dynamic forward does not notice — opening one asks the server nothing — so every connection through it is refused at channel-open and reported as the same general failure. The fixture patches it and HUPs sshd. There are two sshd_config files in that image and the running server uses /config/sshd/sshd_config; the first attempt patched /etc/ssh/sshd_config, which is the one a search finds first, changed the text and nothing else, and left the failure exactly where it was. VERIFIED. Build clean with no new warnings, 85 tests in Client.Ssh.Tests against the real sshd, and the solution builds. The proxy test was seen to fail — proxy.Port + 1 in BuildConnectionInfo — and seen green again. An earlier mutation attempt did not compile, and the log said 85 passing because the run never started and the previous log was still on disk; the second attempt deletes the log first, which is worth copying whenever a mutation "passes". dotnet format reports one pre-existing IDE1006 in DodoSSH.Api/Features/Events/EventsEndpoint.cs, in a project nothing here touches. Left alone.	2026-08-07 13:48:15 +02:00