openclaw - 💡(How to fix) Fix Feature: HMAC/token-based mutual auth for inter-agent sessions_send [1 participants]

Fix Plan

To address the issue, we will implement a per-session signing token or HMAC on outgoing sessions_send payloads. This will enable receiving agents to verify the message's origin.

Step-by-Step Solution

1. Generate a secret key for each agent and store it securely.
2. Create a signing function that takes the payload and secret key as input and returns a signed token.
3. Modify the sessions_send function to include the signed token in the payload.
4. Implement verification on the receiving agent to check the signed token.

Example Code (Python)

import hmac
import hashlib

def generate_secret_key():
    # Generate a secret key for each agent
    return hashlib.sha256(str.encode("agent_secret")).digest()

def sign_payload(payload, secret_key):
    # Create a signed token using HMAC
    return hmac.new(secret_key, payload.encode(), hashlib.sha256).hexdigest()

def verify_payload(payload, signed_token, secret_key):
    # Verify the signed token
    expected_token = sign_payload(payload, secret_key)
    return hmac.compare_digest(expected_token, signed_token)

# Example usage
secret_key = generate_secret_key()
payload = "example_message"
signed_token = sign_payload(payload, secret_key)

# Send the payload with the signed token
# ...

# Verify the payload on the receiving agent
if verify_payload(payload, signed_token, secret_key):
    print("Payload is valid")
else:
    print("Payload is invalid")

Verification

To verify the fix, test the following scenarios:

• Send a valid payload with a signed token and verify that it is accepted by the receiving agent.
• Send a tampered payload with an invalid signed token and verify that it is rejected by the receiving agent.
• Test with different agents and secret keys to ensure the solution is scalable and secure.

Extra Tips

• Use a secure method to store and manage secret keys.
• Consider implementing a key rotation mechanism to update secret keys periodically.
• Monitor and analyze logs to detect potential security incidents.