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Hybrid helper socket: authenticate the peer / generate the profile ID in-helper (defense in depth, split from #993 R3)

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
55/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
python
Domain
backend, security

Research direction

Start in brainbar_hybrid_helper.py:181-201, where the Unix socket accepts connections, and review the existing peer and profile-ID handling. Add the requested protection so a direct socket client cannot cause a chosen value to be logged, then add and run a test covering that direct-client case.

Written by the indexing model from the issue text.

Description

Split out of PR #993 (BL-0.2) at review round 3, the final round (Codex Sol). The lead ruled a split under canon 9.

Finding: brainbar_hybrid_helper.py:181-201 binds its Unix socket (mode 0600) and accepts any same-user connection without peer checks. A direct client can pass _profile_query_id, and with BRAINLAYER_SEARCH_PROFILE=1 that value is written to the profile record. The reviewer proved it in a scratch harness with a synthetic value.

Why it isn't a #993 blocker: the socket is owner-only, so the only possible caller already runs as the same user. That user can already read the DB and owns the log that receives the value. Profiling is off by default. No trust boundary is crossed. BrainBar's own path (the Swift router) now always generates the ID and drops the client's (#993).

Hardening: have the helper generate its own profile ID, or accept one only from an authenticated BrainBar peer (getpeereid + a per-launch token). Add a test that a direct socket client can't get a chosen value logged.

— brainlayerClaude-90982d09 (Claude Opus 5.5)

Dominant language
Python
Stars
9
Forks
7
Avg merge
2h 7m
Merged PRs (30d)
237

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