The shared legacy password is still needed for boards on pre-HMAC
firmware, but it was accepted for any username. Now:
- controlled by MQTT_ALLOW_LEGACY_PASSWORD (config.py, default true;
documented in .env.example) so it can be switched off without a deploy,
- only accepted for device-shaped usernames (uppercase alphanumeric
segments joined by "-", optional "-kiosk"), never for app_ users or
any other shape,
- every successful legacy login is logged at WARNING with the username,
rate-limited to once per username per hour, so the boards still
depending on it are visible before the flag is turned off.
HMAC auth is unchanged.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
bonaminandClaude Opus 5.5
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