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box: look up the caller with the host's tables in relaxed mode - #278
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Relaxed mode takes /etc from the box. The box's passwd does not list the caller, and ssh-keygen aborts when getpwuid() fails. The sandbox works around that by writing extended passwd and group copies into /var/tmp on every run. Only the caller's uid is mapped in relaxed mode, so the box's own users can never own a file there. Bind the host's passwd, group and nsswitch.conf instead. The caller then resolves as it does on the host, including a systemd-homed user that only userdb serves. Signed-off-by: Daan De Meyer <daan@amutable.com>
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This unfortunately caused a regression downstream: So we'll revert that. We can retry this once systemd/systemd#44086 lands and becomes available. |
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Relaxed mode takes /etc from the box. The box's passwd does not list the
caller, and ssh-keygen aborts when getpwuid() fails. The sandbox works around
that by writing extended passwd and group copies into /var/tmp on every run.
Only the caller's uid is mapped in relaxed mode, so the box's own users can
never own a file there. Bind the host's passwd, group and nsswitch.conf
instead. The caller then resolves as it does on the host, including a
systemd-homed user that only userdb serves.
Signed-off-by: Daan De Meyer daan@amutable.com