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fix-forward #2633: identity-only auth ignores the token rotation cutoff (tsk-sonaie) - #2799

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fix-forward #2633: identity-only auth ignores the token rotation cutoff (tsk-sonaie)#2799
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@jaylfc jaylfc commented Sep 5, 2026

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CARD TITLE (intent, not commit subject): fix-forward #2633: the dead-credential 404 fires on existing off-allowlist routes and the garbage-credential control is inert

Autonomous build of board card tsk-sonaie.

BASE: origin/dev. Supersedes #2792 (and, transitively, the abandoned exec/tsk-iqk2bn line behind it).

Read this first: most of the card is already fixed on dev

The card was written against exec/tsk-iqk2bn, whose parent commits never
reached dev. In the meantime dev solved the same problem independently, via
ae71bb203 (fix-forward tsk-okf4cz, PR #2716 on top of #2698/#2702). Measured
on clean origin/dev @ b8f7726ea:

$ python -m pytest tests/test_a2a_bus_agent_auth.py::TestBusAgentAuth::test_skeleton_key_guard_agent_token_rejected_off_allowlist \
    tests/test_agent_scope_requests.py::test_agent_cannot_approve_its_own_request \
    tests/test_agent_scope_requests.py::test_agent_cannot_deny_its_own_request \
    "tests/test_auth_middleware.py::TestRegistryJwtRouteResolution" -q -p no:cacheprovider
8 passed in 25.67s

So, against current dev:

  • Card item 1 (404 on existing off-allowlist routes) — already fixed. The
    three guard tests are green, and dev's _any_route_matches consults the
    router before answering 404. It also handles {x:path} converters, which the
    abandoned branch did not.
  • Card item 2 (garbage-credential control inert) — not applicable. dev has
    no _looks_like_registry_jwt; a garbage bearer reaches
    check_agent_identity, which raises on a bad signature, so it 401s. Revoked
    identities 401 too.

Rebasing the old branch would have re-landed a duplicate, dead second 404 branch
next to dev's (the section-2 branch fires first for any registry JWT), so this
PR is cut fresh from dev and carries only the part of the chain that is still
a live defect.

What changed

check_agent_identity did not honour the token rotation cutoff.

check_agent_scope (agent_token_auth.py:115-119) and
check_agent_scope_for_project (:291-294) both reject a token whose iat
predates the identity's token_min_iat. check_agent_identity verified the
signature and status == "active" and stopped there.

That function is the only auth on every surface that needs no scope grant:

  • POST /api/agents/registry/{cid}/scope-requests — the one route whose whole
    purpose is asking for MORE privilege
  • the agent decisions routes (routes/decisions.py:201,425)
  • container-provisioning requests (routes/container_requests.py:90,181,251,284)
  • the auth-request flow (routes/agent_auth_requests.py:1059)

rotate-tokens is the single lever for killing a leaked agent token without
deleting the identity, and on all of those it revoked nothing. Before this fix a
rotated token POSTing a scope request returned 200 and left a live pending
row behind.

Second symptom, same cause: the middleware asks check_agent_identity whether
the caller is live before answering the wrong-URL 404, so a rotated token on an
unrouted path was told its URL was wrong rather than that its credential was
dead — the exact distinction this card chain exists to protect.

The test double that hid it. _request() in tests/test_auth_middleware.py
built req.headers as a plain dict, but a real Request's headers are
case-insensitive. The middleware reads "authorization"; check_agent_identity
reads "Authorization". On a dict the real credential check therefore saw no
header at all
and returned None instead of raising — which is why every arm
in that module has to patch check_agent_identity to observe anything. It now
builds starlette.datastructures.Headers, and the two new arms run the real
liveness chain unpatched.

RED FIRST (pasted)

At origin/dev (b8f7726ea) with these tests applied and
tinyagentos/agent_token_auth.py untouched:

$ python -m pytest "tests/test_token_rotation.py::TestTokenMinIatIdentity" \
    "tests/test_auth_middleware.py::TestRegistryJwtRouteResolution" \
    tests/test_agent_scope_requests.py::test_agent_cannot_self_request_with_rotated_token \
    -q -p no:cacheprovider

FAILED tests/test_token_rotation.py::TestTokenMinIatIdentity::test_rotated_token_rejected
FAILED tests/test_auth_middleware.py::TestRegistryJwtRouteResolution::test_rotated_registry_jwt_unknown_route_returns_401_not_404
FAILED tests/test_agent_scope_requests.py::test_agent_cannot_self_request_with_rotated_token
3 failed, 8 passed in 12.79s

The real-caller arm is the one that shows the bite — a superseded token creating
a scope request anyway:

>           assert resp.status_code == 404, resp.text
E           AssertionError: {"request_id":"6eeb1b6860e74e98a2cbc5c9e78d3121","status":"pending"}
E           assert 200 == 404

and the middleware arm:

>       assert resp.status_code == 401
E       assert 404 == 401
E        +  where 404 = <starlette.responses.JSONResponse object at ...>.status_code

Both controls were RED-checked in the same run and stay green throughout:
test_token_minted_after_bump_still_proves_identity (rotation must not lock out
the replacement) and test_default_zero_cutoff_keeps_identity_valid (the
migration default must not lock out live tokens).

The 404 side is guarded against over-correction by
test_live_registry_jwt_unknown_route_still_returns_404, which runs the same
unpatched liveness chain with a live record and still expects the wrong-URL 404
— narrowing must not become removal.

GREEN

$ python -m pytest tests/test_token_rotation.py tests/test_auth_middleware.py \
    tests/test_agent_scope_requests.py tests/test_agent_token_auth.py -q -p no:cacheprovider
136 passed in 251.05s (0:04:11)

Full suite (pytest tests/ --ignore=tests/e2e -n auto, the CI invocation) is running locally; this section is updated with its summary line, and CI runs the same suite sharded 4 ways.

Note on the route status: the rotated-token scope-request arm asserts 404,
not 401. _authorize_scope_request_creation deliberately folds every
bad-credential outcome into the existence-hiding not-found body so that
(unknown target 404, existing target 401/403) cannot be used as an existence
oracle. The load-bearing assertion in that test is that nothing was created.

Docs

  • docs/agent-coordination.md, "Agent API surface (scoped registry JWT)" — the
    refused-request contract now states the three-way split explicitly: no route
    matches -> 404; route exists but the token is not authorised -> 401; the
    credential is dead (revoked, or superseded by rotate-tokens) -> 401 on every
    path. Anonymous callers get 401 everywhere, so status codes cannot enumerate
    routes.
  • docs/agent-coordination.md, "Requesting more scope for an existing identity"
    — records that the bearer must be LIVE, and why it matters most on that route.
  • changelog.d/tsk-sonaie-identity-honours-token-rotation.md — new fragment
    (### Security).
  • python scripts/check_doc_gate.py invariants -> doc-gate: clean.

Scoped out of the card, with evidence

  • "Correct the changelog fragments"changelog.d/tsk-hbzm7l-*,
    tsk-vylg2y-* and tsk-iqk2bn-* exist only on the abandoned
    exec/tsk-iqk2bn branch; none of them is on dev. There is nothing to
    correct here.
  • The garbage-credential fixture fix — that control lived in the abandoned
    branch's _looks_like_registry_jwt tests, which have no counterpart on dev.
    The equivalent path on dev (check_agent_identity raising on a bad
    signature) is exercised by the arms in TestRegistryJwtRouteResolution.

Summary by CodeRabbit

  • Bug Fixes

    • Rotated agent tokens are now rejected consistently across identity-authenticated routes.
    • Superseded tokens return the appropriate unauthorized response instead of appearing valid or producing an incorrect route-not-found response.
    • Live tokens continue to work normally, while rotated tokens can no longer create scope requests.
    • Concurrent scope requests now enforce pending-request limits reliably.
  • Documentation

    • Clarified authentication status codes and token-rotation behavior for agent API requests.

…sonaie)

check_agent_identity verified the signature and the registry status but not
token_min_iat, the cutoff that check_agent_scope and
check_agent_scope_for_project both enforce. It is the ONLY auth on the surfaces
that need no scope grant, so rotate-tokens -- the single lever for killing a
leaked agent token without deleting the identity -- did not actually revoke
anything on them: creating a scope request, the agent decisions routes,
container-provisioning requests and the auth-request flow all still accepted a
superseded token. Measured before the fix: a rotated token POSTing to
.../scope-requests returned 200 and left a live pending row behind, on the one
route whose whole purpose is asking for MORE privilege.

Second symptom, same cause: the middleware's unknown-route branch asks
check_agent_identity whether the caller is live before answering the wrong-URL
404, so a rotated token on an unrouted path was told its URL was wrong rather
than that its credential was dead.

Also fixes the test double that hid this. _request() in test_auth_middleware
built req.headers as a plain dict, but a real Request's headers are
case-insensitive: the middleware reads "authorization" while check_agent_identity
reads "Authorization", so on a dict the real credential check saw no header and
returned None. Every arm in that module had to patch check_agent_identity to
observe anything. It now builds starlette Headers, and the two new arms run the
real liveness chain unpatched -- one rotated (401) and one live (404), so
narrowing cannot silently become removal.
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coderabbitai Bot commented Sep 5, 2026

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Review Change Stack

📝 Walkthrough

Walkthrough

Changes

Identity token rotation enforcement

Layer / File(s) Summary
Identity liveness cutoff
tinyagentos/agent_token_auth.py, tests/test_token_rotation.py
check_agent_identity now uses a shared cutoff check and rejects tokens older than token_min_iat. Tests cover boundary, missing-value, superseded, current, and default-cutoff cases.
Route resolution for dead credentials
tests/test_auth_middleware.py, changelog.d/..., docs/agent-coordination.md
Middleware tests verify 401 for rotated tokens and 404 for live tokens on unknown routes. Documentation records the status-code behavior.
Scope-request enforcement and pending caps
tests/test_agent_scope_requests.py, docs/agent-coordination.md
Scope-request creation rejects superseded tokens. Tests cover atomic pending-cap enforcement, slot reuse, and per-agent isolation.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to b7a79

Token rotation now prevents superseded identity-only tokens from accessing protected flows while preserving the scope-request route’s existing credential-hiding response behavior. No actionable current-head merge risk remains.

Suggested reviewers: hognek

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 75.86% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 29 functions across 4 files. (2 skipped: … Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (4 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly identifies the fix: identity-only authentication now respects the token rotation cutoff. It is specific to the main change.
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage

Explanation

Docstring coverage is 75.86% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 29 functions across 4 files. (2 skipped: 2 unsupported.)

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Comment thread tinyagentos/agent_token_auth.py Outdated
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Code Review Summary

Status: 2 Issues Found | Recommendation: Address before merge

Overview

Severity Count
CRITICAL 0
WARNING 1
SUGGESTION 1
Issue Details (click to expand)

WARNING

File Line Issue
tinyagentos/agent_token_auth.py 210 Token-rotation cutoff block is now triplicated across _verify_agent_scope, check_agent_identity, and check_agent_project_grants; any future tweak (clock-skew tolerance, error detail, status code) must be applied to all three sites or one will silently disagree. Extract a _enforce_rotation_cutoff(record, payload) helper.

SUGGESTION

File Line Issue
tinyagentos/agent_token_auth.py 211 payload.get("iat") or 0 silently treats a JWT with no iat claim (or iat=0) as epoch-0, which is "superseded" by any identity whose token_min_iat > 0. The pattern is consistent across all three cutoff sites but undocumented; either add a one-line comment or raise HTTPException(401, "token missing iat") when iat is absent.
Files Reviewed (6 files)
  • changelog.d/tsk-sonaie-identity-honours-token-rotation.md - 0 issues
  • docs/agent-coordination.md - 0 issues
  • tests/test_agent_scope_requests.py - 0 issues
  • tests/test_auth_middleware.py - 0 issues
  • tests/test_token_rotation.py - 0 issues
  • tinyagentos/agent_token_auth.py - 2 issues

Fix these issues in Kilo Cloud


Reviewed by minimax-m3:free · Input: 42.3K · Output: 10K · Cached: 539.9K

Docs-Reviewed: merge only, no new installer behavior introduced by this branch
… document the iat/token_min_iat zero-default policy

kilo-code-bot found the token_min_iat check copy-pasted into _verify_agent_scope,
check_agent_identity, and check_agent_project_grants -- any future change to
the cutoff semantics had to be applied in three places or one would silently
disagree. Extracted _enforce_rotation_cutoff and pointed all three call sites
at it, plus documented why a missing token_min_iat or iat defaults to 0
instead of being rejected outright.

Docs-Reviewed: pure internal refactor, no behavior/agent-facing change -- the rotation-cutoff semantics documented in docs/agent-coordination.md are unchanged, only the implementation is now a single shared helper
@jaylfc

jaylfc commented Sep 6, 2026

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Fold pass 2026-09-06

Merged origin/dev into exec/tsk-sonaie.

Conflicts resolved (both intents kept):

  • docs/agent-coordination.md: two additive paragraphs on the same scope-request bullet (this PR's token-rotation note, dev's pending-cap note) -- kept both, rotation note first.
  • tests/test_agent_scope_requests.py: two independent new tests (test_agent_cannot_self_request_with_rotated_token from this PR, test_concurrent_self_requests_cannot_bypass_pending_cap from dev) plus an import-line conflict (time vs asyncio) -- kept both tests and both imports.

Tests: tests/test_agent_scope_requests.py tests/test_auth_middleware.py tests/test_token_rotation.py tests/test_routes_agent_auth_requests.py -- 205 passed, 0 failed.

Findings:

  • Fixed: kilo-code-bot flagged the token_min_iat rotation-cutoff check triplicated across _verify_agent_scope, check_agent_identity, and check_agent_project_grants in tinyagentos/agent_token_auth.py. RED: added TestEnforceRotationCutoffHelper in tests/test_token_rotation.py importing _enforce_rotation_cutoff, which did not exist -- ImportError: cannot import name '_enforce_rotation_cutoff'. Fixed by extracting the helper and pointing all three call sites at it. Green: 131 passed (127 + 4 new).
  • Fixed: kilo-code-bot's companion suggestion to document the payload.get("iat") or 0 / token_min_iat or 0 default policy -- now documented in the new helper's docstring (safe-by-default: a never-rotated identity has no cutoff, a token missing iat is treated as infinitely old rather than exempt).

New head: b7a79a706

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Actionable comments posted: 1

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.

Inline comments:
In `@docs/agent-coordination.md`:
- Around line 759-760: Update the documentation around check_agent_identity to
state that rotation-superseded or dead credentials receive HTTP 401, replacing
the incorrect 404 reference while preserving the existing existence-hiding
behavior description.

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  • changelog.d/tsk-sonaie-identity-honours-token-rotation.md
  • docs/agent-coordination.md
  • tests/test_agent_scope_requests.py
  • tests/test_token_rotation.py
  • tinyagentos/agent_token_auth.py
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Comment thread docs/agent-coordination.md
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jaylfc merged commit 4880e34 into dev Sep 6, 2026
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