fix: dont leak session data / implement client HELLO

[JarbasAl]

closes #35

Summary by CodeRabbit

• New Features

  • Enhanced client connection protocol with public key support
  • Improved message handling for client handshake and session management

• Bug Fixes

  • Refined HELLO message processing to ensure more robust client interactions

• Chores

  • Updated logging for better debugging and clarity

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📥 Commits

Reviewing files that changed from the base of the PR and between 2340b1c and 08a06a2.

📒 Files selected for processing (1)

• hivemind_core/protocol.py (6 hunks)

Walkthrough

The pull request modifies the hivemind_core/protocol.py file to enhance the client connection protocol. A new optional pub_key field is introduced in the HiveMindClientConnection class to store the client's public key. A new handle_hello_message method is added to the HiveMindListenerProtocol class to process HELLO messages, updating client session and site ID information. The changes improve message handling by explicitly managing HELLO messages and adjusting the handshake process logging.

Changes

File	Change Summary
hivemind_core/protocol.py	- Added pub_key: Optional[str] to HiveMindClientConnection - Introduced handle_hello_message method in HiveMindListenerProtocol - Modified handle_handshake_message to improve session handling - Updated logging statements

Assessment against linked issues

Objective	Addressed	Explanation
Secure session transmission [#35]	❓	Partial implementation of session handling, but full security mechanism not clearly evident

Possibly related PRs

• fix: bind hm_protocol to agent_protocol #26: Modifications to HiveMindListenerProtocol message handling logic in the same file

Suggested labels

fix

Poem

🐰 A rabbit's tale of protocol delight,
Where messages dance with security's might,
Public keys whisper, sessions take flight,
Handshakes now safer, no secrets in sight,
Code evolves, making connections just right! 🔒

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[coderabbitai]

Actionable comments posted: 1

🧹 Nitpick comments (3)

hivemind_core/protocol.py (3)

69-70: Address the “TODO” to store pub_key in the database.
This field is currently a placeholder. Consider persisting the public key to a secure location for auditing, key rotation, or verification.

I can help draft a migration script or propose an ORM change to integrate database persistence if needed.

---

367-368: Validate the HELLO message flow.
Now that HELLO messages are explicitly handled, consider verifying clients have completed or initiated a valid handshake before further processing. This helps ensure no premature or malicious session data injection.

---

508-508: Consider disconnecting or handling uninitialized sessions.
When the client fails to provide a session, relying solely on a warning log may lead to insecure scenarios or unexpected state. Ensure this condition doesn’t persist undetected and take corrective action if needed.

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📥 Commits

Reviewing files that changed from the base of the PR and between 136f64f and 2340b1c.

📒 Files selected for processing (1)

• hivemind_core/protocol.py (4 hunks)

🔇 Additional comments (1)

hivemind_core/protocol.py (1)

489-491: Ensure handshake payload does not inadvertently leak data.
Although sending this message helps the client recreate the crypto key, verify no sensitive data (e.g., unencrypted session contents) are logged or included in the packet at debug or trace levels.