Severity HIGH. The /transcript route in main.py used `if expected:`
around the bearer-token compare, so `get_token()` returning None (no
/configs/.auth_token on disk — bootstrap window, deleted file, OSError)
silently skipped the entire auth check. Any container on
molecule-monorepo-net could GET /transcript during the provisioning
window and walk away with the full session log (user messages, Claude
tool calls, assistant replies).
The platform's TranscriptHandler always has a valid token (it acquired
one at workspace registration), so tightening this gate has no
legitimate-caller impact. Only unauthenticated sniffers lose access,
which was never the intended contract of #287.
Fix:
1. Extracted the auth gate into `workspace-template/transcript_auth.py`
— a 20-line module with no heavy imports so the security-critical
code is unit-testable without standing up the full uvicorn/a2a/httpx
stack (the former inline guard could only be tested end-to-end,
which explains why the regression shipped in #287).
2. `transcript_authorized(expected, auth_header)` returns False when
`expected` is None or empty — the #328 fix — and otherwise does
strict equality against "Bearer <expected>".
3. main.py's inline handler calls the extracted function:
if not _transcript_authorized(get_token(), auth_header):
return 401
4. New tests/test_transcript_auth.py covers: None token, empty token,
valid bearer, wrong bearer, missing header, case-sensitive prefix,
whitespace fuzzing. All 7 pass.
Closes#328
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
