Josh Patterson
21222ff119
These accounts existed only for container UID mapping and filesystem ownership, but user.present omitted shell:, so Salt fell through to the platform useradd default and every one of them got /bin/bash. Pin them to /sbin/nologin so none can be used as an interactive login or `su -` target. socore keeps /bin/bash: `su socore -c '/usr/sbin/so-repo-sync'` in soup and so-kernel-upgrade execs the account's passwd shell, and operator docs tell users to su to socore. soqemussh keeps /bin/bash as an SSH login account. elastic-agent, elastic-agent-pr and kafka are included alongside the accounts named in the issue, being the same class with the same unset shell, so the default is uniform. Cron is unaffected: cronie runs jobs via the crontab SHELL (default /bin/sh), not the passwd shell. suricata is the only account changed here that owns a crontab, and somon has shipped as nologin with a working cron job already. The zeek `runuser -l zeek` calls all run inside so-zeek via docker.run/exec, so they resolve the shell from the image, not the host. Verified on a 3.4.0 managersearch + sensor grid: highstate converges with the shell as the only change and no failures, is idempotent on a second run, all containers stay up, SOC still issues a Kratos login flow, and the suricata surilogcompress cron job runs post-change ((suricata) CMD/CMDEND in /var/log/cron) while `su - suricata` is now refused. Closes #16256
Security Onion
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