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Connection doesn't work after workspace restart #427

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dimm0 opened this issue Jan 22, 2025 · 1 comment
Open

Connection doesn't work after workspace restart #427

dimm0 opened this issue Jan 22, 2025 · 1 comment

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@dimm0
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dimm0 commented Jan 22, 2025

Opening VSCode from coder works on the first load. If the workspace restarts, the host ssh key changes, and connection doesn't work anymore with the error:

[13:30:19.033] stderr> debug1: Server host key: ssh-rsa SHA256:Q7o4526ZRT7PXLhauYV2lr6TgfJyD+ll1uk7HlVI03M
[13:30:19.034] stderr> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
[13:30:19.034] stderr> @    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
[13:30:19.034] stderr> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
[13:30:19.034] stderr> IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
[13:30:19.034] stderr> Someone could be eavesdropping on you right now (man-in-the-middle attack)!
[13:30:19.034] stderr> It is also possible that a host key has just been changed.
[13:30:19.034] stderr> The fingerprint for the RSA key sent by the remote host is
[13:30:19.034] stderr> SHA256:Q7o4526ZRT7PXLhauYV2lr6TgfJyD+ll1uk7HlVI03M.
[13:30:19.034] stderr> Please contact your system administrator.

Manually deleting the existing host key from ssh known_hosts fixes this and makes it work again until the next restart.

Latest version of coder and all below.
@coder-labeler coder-labeler bot added customer-reported help wanted Extra attention is needed labels Jan 22, 2025
@matifali matifali removed help wanted Extra attention is needed customer-reported labels Feb 5, 2025
@ethanndickson
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ethanndickson commented May 1, 2025 •
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This is strange, as the SSH config the VS Code extension generates sets:

StrictHostKeyChecking no

Can you double check that's the case in your SSH config? The default location is ~/.ssh/config, and you're looking for the block starting with:

# --- START CODER VSCODE coder.example.com ---

In any case, we recently made the host key of Coder workspaces deterministic, seeded by the workspace owner username, and the name of the workspace (coder/coder#16626 coder/coder#17258). That means this will stop happening, even with strict host key checking enabled.

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@dimm0 @matifali @ethanndickson