fix(p2p): harden hello payload validation against malformed payloads … - #140
fix(p2p): harden hello payload validation against malformed payloads …#140shantanushok wants to merge 1 commit into
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WalkthroughThe network handler now rejects malformed hello payloads and invalid ChangesHello validation
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟠 High · up to The PR hardens malformed hello payload handling, but malformed chain request or response payloads can still terminate P2P message processing and leave the node unable to process further network traffic; this validation gap should be fixed before merge. Minor follow-up issues also remain around negative peer tip values and success logging before final validation. Possibly related PRs
Suggested labels: Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Pull request overview
This PR hardens the P2P network message handler by adding stricter validation for incoming hello messages to prevent malformed peer data from crashing the node’s asyncio reader loop.
Changes:
- Added a type guard to ensure
hellopayloads are dictionaries before accessing.get(...). - Added validation to ensure
latest_block_indexis a true integer (rejecting non-ints andbool).
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| if payload is None and msg_type in ("chain_request", "chain_response"): | ||
| return | ||
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| # Note: a null payload in a hello message deliberately falls through | ||
| # to the isinstance(payload, dict) guard below, which disconnects the peer. |
| logger.info("🔄 Handshake successful with %s", peer_addr) | ||
| peer_tip = payload.get("latest_block_index", 0) | ||
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| if not isinstance(peer_tip, int) or isinstance(peer_tip, bool): | ||
| logger.warning( | ||
| "Malformed hello from %s: latest_block_index is not an integer (got %s). Disconnecting.", | ||
| peer_addr, type(peer_tip).__name__ | ||
| ) | ||
| asyncio.create_task(network.disconnect_peer(peer_addr)) | ||
| return ValidationStatus.MALFORMED |
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Actionable comments posted: 4
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Inline comments:
In `@main.py`:
- Around line 225-231: Move the “Handshake successful” log in the hello-handling
flow to after the latest_block_index validation guard, so it is emitted only
when validation passes; keep the malformed-peer disconnect and
ValidationStatus.MALFORMED return behavior unchanged.
- Around line 225-231: Update the peer_tip validation in the hello-handling path
to also reject negative integers, while continuing to reject non-integers and
booleans. Route negative values through the existing malformed warning,
disconnect, and ValidationStatus.MALFORMED flow.
- Line 197: Update the ignored-message branch in the handler to use an explicit
return of None instead of a bare return, while preserving the existing
ValidationStatus returns in the hello branches.
- Around line 196-197: Update the chain_request and chain_response handling near
the existing payload guard to reject any non-dictionary payload, including
values other than None, before invoking code that calls payload.get(). Preserve
the current behavior for None and valid dictionary payloads so malformed
messages cannot terminate the P2P reader task.
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main.py
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@SIDDHANTCOOKIE can you help me understand why the job is failing is it due to my fault because I have only made changes on main.py ? edit: |
yeah its because of a forked pr im making changes to the workflow but would be effective from next pr |
SIDDHANTCOOKIE
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Separate from the hello fix above chain_request has the identical gap, just not touched by this PR (start_index < len(chain.chain)) only gets a dict-container check, not int-validation on start_index/limit. Same crash: {"type":"chain_request","data":{"start_index":"0"}} kills _asyncio_reader the same way the old hello payload did. Might be worth the same treatment, either here or as a follow-up.
Addressed Issues:
Description:
Bug: A connected peer could send a syntactically valid JSON hello message with a non-dict data field (e.g. a list, string, or integer). The handler in make_network_handler called payload.get("chain_id") without first verifying that payload is a dict. For any non-dict payload, this raises AttributeError.
Impact:
The AttributeError propagated out of _asyncio_reader in p2p.py (line 228), which has no try/except wrapper around the handler callback dispatch. The asyncio task died silently - the node remained online with all peer connections intact, but permanently stopped processing any further P2P messages (blocks, transactions, chain sync requests) for the rest of the session. This is a remotely-triggerable denial-of-service requiring a single 35-byte packet.
Fix:
Added an isinstance(payload, dict) guard as the first statement inside the hello branch, before any payload.get() call. Non-dict payloads now return ValidationStatus.MALFORMED and schedule a peer disconnection cleanly - no exception propagates and hardened extension and implemented a check for peer_tip (bool datatype) too.
Screenshots/Recordings:
Not applicable - this is a network message handler bug with no visual interface. The fix was validated with a self-contained test that confirmed :
1] All 5 non-dict payload types (list, string, int, float, bool) trigger AttributeError in the unfixed handler.
2] The AttributeError propagates out of the simulated _asyncio_reader loop and kills the task.
3] The fixed handler returns MALFORMED cleanly, the task stays alive, and subsequent messages are processed normally.
AI Usage Disclosure:
I have read the AI Usage Policy and this PR complies with this policy. I have tested the code locally and I am responsible for it.
I have used the following AI models and tools: Antigravity IDE (Claude Sonnet 4.6 ) and CodeRabbit used for code review, root cause tracing. The fix was reviewed, understood, and verified locally before submission.
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