The web SSH terminal and the credential API reported `ctfuser` for all 16
challenges, but only the 6 native GEMASTIK XVIII images provision ctfuser.
Every imported XVI/XVII image does `RUN echo root:${PASSWORD} | chpasswd`,
so 10 of 16 participant logins were refused with "Permission denied".
Root causes (all the same class of bug - login hardcoded in the wrong layer):
- main.py websocket ssh handler read st["ssh_user"], a single team-wide value
defaulting to ctfuser, instead of the per-challenge registry field
- /api/credential proxied the global receiver on :18080, which only knows the
6 native challenges, so the other 10 returned "Invalid challenge"
- team.html hardcoded the challenge picker to those same 6 challenges, making
the other 10 unreachable from the terminal entirely
- index.html rendered `<b>ctfuser</b>` and a stale hardcoded SSH port table
Fixes:
- orch.challenge_credential()/all_teams() read the TEAM's state.json, which
holds the same per-challenge password the panel chpasswds
- gen_receiver_services.py injects SSH_USER_<port> from the registry so the
receiver's /credential endpoint agrees with the panel
- receiver Challenge.credentials() honours SSH_USER_<port> (ctfuser fallback)
- new /api/team/{idx}/own-challenges feeds the picker; targets now carry
challenge + ssh_user
- UI takes user and port from the server instead of hardcoding them
Verified: 32/32 credential payloads correct across teams 1-2, and 32/32 real
paramiko SSH logins succeed with whoami confirming the expected account.
Also adds bulk team delete: POST /api/teams/bulk-delete runs one background
thread and is polled via GET /api/teams/bulk-delete/{job_id}, plus per-team
checkboxes with select-all/clear in the UI. Deletion must stay sequential
because delete_team() regenerates shared artifacts at the end.
Passwords failed on 10/16 challenges while state.json looked correct:
- only the 6 native GEMASTIK XVIII images provision 'ctfuser'; every imported
XVI/XVII image does 'echo root:${PASSWORD} | chpasswd' and logs in as root.
set_ssh_passwords() hardcoded ctfuser, so chpasswd set a password on an
account nobody uses -> 'Permission denied' everywhere.
Registry gains a per-challenge 'ssh_user'; chpasswd now targets the real
login (and ctfuser/ctf when present) and reports failures loudly.
- phew checker: chall.py block-buffers stdout through the docker exec pipe
(PYTHONUNBUFFERED now set) and leaks chall.py inside the container on
timeout (26 orphans, container saturated) -> reaps the whole exec process
group. Startup does a fresh Pailier keygen (~12 s) so crypto reads need
_CRYPTO_TIMEOUT, not the 5 s prompt default.
Adds panel/verify_ssh_creds.py (proves the state->container binding from
inside via a real login), audit_ssh_users.sh, reset_runtime.sh.
root
Cyrene
MythEclipse