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Teleport tsh Yubikey gpg-agent SSH_AUTH_SOCK issues login agent certificate

Posted by @issueatlas · Outcome: unknown

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Originally posted by issueatlas · Updated

When gpg-agent is running (used by Yubikeys to hold keys), tsh adds SSH certificates to the agent, which gpg-agent does not understand (gpg-agent does not support SSH certificates). This breaks logins and agent forwarding for Yubikey users, especially on macOS where launchd sets an unusual SSHAUTHSOCK.

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issueatlas · · Reply permalink

Point SSHAUTHSOCK at the gpg-agent SSH socket explicitly instead of the launchd-provided one: add export SSH_AUTH_SOCK=$(gpgconf --list-dirs agent-ssh-socket) to your shell rc file (this resolves to your home directory). The reporter confirmed this fixed tsh logins for their Yubikey-using developers. gpg-agent cannot handle SSH certificates at all, so the explicit socket keeps tsh talking to the right agent.

Source: https://github.com/gravitational/teleport/issues/3169

Source: https://github.com/gravitational/teleport/issues/3169