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feat(auth): every accepted request names the path that granted it 
Closes #60. Closes #58 (fixed in mcp-chassis v0.7.0, consumed here).

Three auth paths reach this server and none of them said so on success.

PassthroughMiddleware logged nothing at all, success or failure. While verifying
#59 end to end there was no way to confirm from the logs whether calls were
using the new PAT pass-through — the caller's own Gitea PAT, the caller's own
identity — or falling through to the shared JWT/static path. The only available
reasoning was inference from which failures were absent.

    INFO mcp auth accepted auth_path=passthrough caller=alice token_fp=...
    INFO mcp auth accepted auth_path=jwt        caller=mathiasbq token_fp=...
    INFO mcp auth accepted auth_path=static     token_fp=...

The first line matters more than the other two. Pass-through is the path where a
request acts as a SPECIFIC Gitea user; an audit trail that cannot say which
identity performed a write is not an audit trail.

chassisauth.Fingerprint, not a local equivalent. The chassis emits token_fp on
its own accepted and rejected lines, and two different fingerprints for the same
token cannot be correlated — which is the only reason the field exists. Exported
from the chassis in v0.7.1 for exactly this.

A token that is not a valid PAT still falls through SILENTLY. The chassis owns
the verdict, and logging here as well would double-count every static-token
request, since all of them reach this middleware first. Asserted, because "logs
nothing on the failure path" is indistinguishable from "was never called".

Also lands #58 by consuming mcp-chassis v0.7.0: a JWT presented to a server with
no JWT auth configured now reports jwt_auth_not_configured rather than
static_token_mismatch. That log line is what sent a debugging session into
re-running the OAuth flow while the credentials were valid the whole time.

Verified: task check EXIT=0.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-09-14 20:59:04 +02:00

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