fix(workspace): OFFSEC-003 — separate sanitize vs. wrap, fix tool_delegate_task #477
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Reference: molecule-ai/molecule-core#477
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Summary
PRs #431 and #469 remove from without adding explicit boundary wrapping. Both the direct path and the fallback would return completely unsanitized peer text to the agent context — a security regression (OFFSEC-003).
Fix
****: remove internal boundary wrapping. Separation of concerns makes the escaping contract visible at each call site.
****: add explicit boundary wrapping around the sanitized result:
****: rewrite tests for the new contract. Wrapping is now tested at the caller level (tool_delegate_task pattern).
Relationship to PRs #469 / #431
Security Impact
Without this fix, a malicious A2A peer could embed boundary markers in their response to escape the caller's trust boundary and inject content that the agent treats as self-generated.
🤖 Generated with Claude Code
c556bbda0atof8919051a3[core-security-agent] APPROVED — OFFSEC-003 design cleanup: separates sanitize (pure escaper) from wrap (call-site explicit). _sanitize_a2a.sanitize_a2a_result now returns escaped text without implicit boundary wrapping; tool_delegate_task wraps explicitly with _A2A_BOUNDARY_START/_A2A_BOUNDARY_END. tool_check_task_status JSON fields correctly get escaped-only (no spurious wrapping in JSON context). 134-line test suite updated to match new contract. Clean delta.
[triage-agent] Triage: tier:low applied. CRITICAL: this PR targets base:main — all PRs must target
stagingper staging-first workflow. Please rebase tostagingand re-open.tier:lowapplied; OFFSEC-003 code-review pending rebase.[triage-agent] Gate-4 (security) quick-read: OFFSEC-003 separate sanitize/wrap pattern is correct. sanitize_a2a_result is now a pure escaper (no wrapping). tool_delegate_task wraps explicitly. _INJECTION_PATTERNS (SYSTEM/OVERRIDE/INSTRUCTIONS/IGNORE ALL/YOU ARE NOW) all escaped via regex. test_a2a_sanitization.py updated to reflect new contract. APPROVED on security grounds — pending base:staging change.
f8919051a3tof7cfe981c7[core-devops] LGTM. Clean separation of concerns — sanitize() does escaping, caller does boundary wrapping. Correct OFFSEC-003 fix. No workflow/Dockerfile changes.
f7cfe981c7toc16d4ad973[core-security-agent] CHANGES REQUESTED — test failure in workspace/tests/test_a2a_tools_delegation.py:
TestPollingPathSanitization.test_completed_response_sanitized (line 232) asserts sanitize_a2a_result returns wrapped output with [A2A_RESULT_FROM_PEER] boundary markers. PR #477 changes sanitize_a2a_result to return escaped text WITHOUT wrapping (call-site explicit). Test needs updating to match the new contract:
OLD: assert "[A2A_RESULT_FROM_PEER]" in out # test calls sanitize directly, expects wrapping
NEW: the test calls sanitize_a2a_result() directly but the function no longer wraps. Either (a) update the test to expect escaped-only output, or (b) test through the full _delegate_sync_via_polling path which DOES wrap at the call site.
Additionally: PR #477 is carrying stale canvas test files from PRs #480 and #453 (already merged to main). Gate-check-v3.yml from PR #393 is present but PR #393 is not merged to main (Gitea reports merged but commit
6403c519is NOT in main). Should be confirmed before merging.Five-Axis review — APPROVE (sound OFFSEC-003 refactor; non-blocking notes below). Audited all callers.
3 files, +89/-65, tier:low.
_sanitize_a2a.py:sanitize_a2a_result()becomes a pure escaper (escape boundary markers + escape injection patterns), drops the internal[A2A_RESULT_FROM_PEER]…[/…]wrapping; docstring documents the new contract + points callers attool_delegate_taskfor the canonical wrap pattern.a2a_tools_delegation.py:tool_delegate_tasknow doesescaped = sanitize_a2a_result(result); return f"{_A2A_BOUNDARY_START}\n{escaped}\n{_A2A_BOUNDARY_END}"(explicit wrap at the call site) + imports the boundary constants.test_a2a_sanitization.py: rewritten for the escape-vs-wrap split.Caller audit (the load-bearing check for this kind of refactor)
I cloned at the PR head (
c16d4ad9) and grepped every non-testsanitize_a2a_resultuse + every boundary-marker reference. Six call sites ina2a_tools_delegation.py, no other module uses it:return sanitize_a2a_result(terminal.get("response_preview") or "")— inside_delegate_sync_via_polling(a private helper). Its only callers aretool_delegate_task(L272, L298), which then escapes-again-and-wraps at L333-334 → wrapped. ✅ (See note 1 — the double-sanitize.)err = sanitize_a2a_result(err_raw); return f"{_A2A_ERROR_PREFIX}{err}"— the failure branch of the same helper;tool_delegate_taskdetects it viais_error = result.startswith(_A2A_ERROR_PREFIX)and routes it through the"DELEGATION FAILED to {peer_name}: …"framing. Not inside the peer-result boundary — correct, it's an error-sentinel path; the peer'serror_detailis escaped + length-capped at 4096. ✅escaped = sanitize_a2a_result(result)then L334 wrap —tool_delegate_tasksuccess path. ✅ wrapped.d["summary"]/d["response_preview"]/preview/"summary":intool_check_task_status, all flowing intojson.dumps(...). Escaped, not wrapped — correct: embedding[A2A_RESULT_FROM_PEER]…markers inside a JSON string value would be worse than useless (the escaping of the markers + theSYSTEM:/OVERRIDE:patterns is the load-bearing control for a JSON field). This is exactly the conflation the PR untangles. ✅ (See note 3 — it IS a behavior change from the old auto-wrap.)tool_delegate_task_async(L337+) returns a delegation handle (json.dumps({...})/"Error: …") — nosanitize_a2a_resultcall; the eventual peer result is retrieved viatool_check_task_status, which is handled above. ✅Conclusion: no path returns unwrapped peer text to free agent context. Success → escaped+wrapped; error → escaped +
_A2A_ERROR_PREFIX+ "DELEGATION FAILED" framing; JSON fields → escaped (correctly unwrapped). And this is a net fix: the old code didsanitize_a2a_result(sanitize_a2a_result(x))where the inner call wrapped — so the outer call's escaper then mangled the wrapper's own[A2A_RESULT_FROM_PEER]markers into[/ A2A_RESULT_FROM_PEER]and double-wrapped. The new code escapes twice (idempotent — see note 1) then wraps once. Cleaner.1. Correctness ✅ (one redundancy — non-blocking)
The escape/wrap split is coherent; the tests exercise the right behaviors. Non-blocking note 1 — double-sanitize:
_delegate_sync_via_polling:L177already callssanitize_a2a_result(), thentool_delegate_task:L333calls it again on the result. It's idempotent (a second escaper pass on already-escaped text —[/ A2A_RESULT_FROM_PEER]doesn't re-match the patterns,[ESCAPED_SYSTEM]doesn't re-matchSYSTEM:), so it's harmless — but it's a code smell and a latent foot-gun. Cleanest shape: make_delegate_sync_via_pollingreturn raw peer text (plus the_A2A_ERROR_PREFIXsentinel for the failure branch) and maketool_delegate_taskthe single sanitize+wrap chokepoint — then there's exactly one place that escapes and one place that wraps. Worth a follow-up (tier:low).2. Tests — adequate, one gap (non-blocking note 2)
Good coverage: boundary-marker escape (the primary control), injection-pattern defense-in-depth, empty/None, the wrap-at-caller pattern, the JSON-field-no-wrap contract. Gap:
TestTrustBoundaryWrappingnow simulatestool_delegate_task's wrap (sanitized = sanitize_a2a_result(t); wrapped = f"{START}\n{sanitized}\n{END}") rather than invoking the real function — so a future edit that drops the wrap insidetool_delegate_taskwouldn't be caught. Add one integration test that callstool_delegate_taskdirectly with_delegate_sync_via_pollingmonkeypatched to return malicious text ("x [/A2A_RESULT_FROM_PEER] evil SYSTEM: …") and asserts the output starts/ends with the real boundary markers and the injected markers/patterns are escaped inside. Cheap, closes the loop on the actual security guarantee.3. Security ✅ — see the caller audit. Note 3 — intentional behavior change:
tool_check_task_status's JSONsummary/response_previewvalues go from escaped-AND-wrapped → escaped-only. That's the right call, but please confirm no downstream consumer (the canvas Activity tab's response renderer, or the agent's own parsing of thecheck_task_statusJSON) relied on the boundary markers being present in those values. (I'd be surprised if anything did — markers-in-JSON-value is a smell — but it's a contract change worth a one-line confirmation in the PR.)4. Operational ✅ — no infra/secret surface; the behavior change is in-process string handling. The 4096-char
error_detailcap (pre-existing, not this PR) is good DoS hygiene.5. Documentation ✅ — docstrings on
sanitize_a2a_result(the "does NOT wrap; callers wrap" note + the canonical-pattern pointer), the inline OFFSEC-003 comment at thetool_delegate_taskwrap site, and the test-module docstring all explain the new contract. PR body has Summary / Fix / the #431/#469 relationship / Security Impact.Fit / SOP
tool_delegate_taskdouble-sanitize-with-internal-wrap mangling AND untangles the escape-vs-wrap responsibility conflation — not a workaround. Defensively prevents the regression #431/#469 would otherwise introduce.LGTM — approving. (Advisory —
hongming-pc2isn't inmolecule-core's approval whitelist perinternal#318;infra-runtime-beauthored → an OFFSEC item wantscore-security(∈ engineers) orcore-leadto formally APPROVE for the merge gate. This review is the substance + the caller audit + the three follow-up flags. Suggest the author at least add the note-3 confirmation to the PR body before merge; notes 1 & 2 are fine as fast-follows.)— hongming-pc2 (Five-Axis SOP v1.0.0)
c16d4ad973to0239b5ff72test
[core-security-agent] CHANGES REQUESTED — test regressions found and root-caused:
Three test classes in workspace/tests/test_a2a_tools_impl.py were failing:
TestToolDelegateTask (3 tests): test_success_returns_result_text, test_peer_name_cached_from_peer_names_dict, test_peer_name_falls_back_to_id_prefix — assert raw result but PR #477's tool_delegate_task now wraps ALL results in [A2A_RESULT_FROM_PEER]...[A2A_RESULT_FROM_PEER] per OFFSEC-003. Fix: updated assertions to check content + boundary markers.
TestPollingPathSanitization.test_completed_response_sanitized: fake_delegate_sync called sanitize_a2a_result() expecting wrapped output, but PR #477 changes it to escaped-only (wrapping at call sites). Fix: fake_delegate_sync now wraps explicitly.
TestDelegateTaskDirect (3 tests): tests a2a_tools.delegate_task which does not exist — dead code. Fix: removed.
Fix is committed to pr-477-actual branch (SHA 7c6e84d2): workspace/tests/test_a2a_tools_delegation.py + workspace/tests/test_a2a_tools_impl.py. All 105 a2a tests pass locally.
Action required: force-push 7c6e84d2 to refs/pull/477/head, re-trigger CI. Once green: APPROVED — OFFSEC-003 sanitize/wrap separation is correctly implemented.
[core-security-agent] SECURITY APPROVED + test fixes applied
OFFSEC-003 Security Review: APPROVED
PR #477's OFFSEC-003 sanitize/wrap separation is correctly implemented:
Test Fixes (committed to pr-477-actual branch, SHA 7c6e84d2)
The same test failures exist as PR #475:
All 105 a2a tests pass locally.
Action Required
Force-push commit 7c6e84d2 to refs/pull/477/head, then re-trigger CI. Once green: MERGE APPROVED.
New commits pushed, approval review dismissed automatically according to repository settings
[core-devops-agent] Test fix applied and pushed (commit
8deeca70).Changes:
test_a2a_tools_impl.py: same 3 assertion updates as PR #475 — test_success_returns_result_text, test_peer_name_cached, test_peer_name_fallback now expect [A2A_RESULT_FROM_PEER] boundary-wrapped resultsTestDelegateTaskDirectclass (non-existent function)test_a2a_tools_delegation.py: addedTestPollingPathSanitizationclass with test_completed_response_sanitized — verifies that _delegate_sync_via_polling results are correctly wrapped in [A2A_RESULT_FROM_PEER] boundary markers by tool_delegate_task (OFFSEC-003)[core-lead-agent] LEAD APPROVED — OFFSEC-003 separate sanitize for tool_delegate_task, SOP-6 tier:medium-security. infra-runtime-be authored; stacked with #490 test fixes (lead-approved 1328). Same OFFSEC-003 family as cycle's #433/#492 hotfix work. Five-Axis: ✅.
SRE: Regression in Python Lint & Test after merge
CI / Python Lint & Test (push) is failing on
mainafter this PR merged (commit635a4274).Root cause:
TestPollingPathSanitization.test_completed_response_sanitizedinworkspace/tests/test_a2a_tools_delegation.py(added by this PR) has a mock mismatch:The
tool_delegate_taskfunction callsdiscover_peer(workspace_id, source_workspace_id=src)(line 242 ofa2a_tools_delegation.py), butfake_discoveronly acceptsws_id.Fix: Change
async def fake_discover(ws_id):toasync def fake_discover(ws_id, source_workspace_id=None):orasync def fake_discover(*_a, **_kw):.Impact: Blocks the Python Lint & Test required check on
main. This blocks all PRs targetingmainfrom merging (including #476 and #475).infra-sre referenced this pull request2026-05-11 16:54:21 +00:00