# Security Policy for Collaboration Module

## Overview

The Collaboration module enables multi-user and multi-agent interactions. Security is paramount as this module handles shared state, permissions, and inter-entity communication.

## Security Considerations

### Access Control

1. **Entity Authentication**: Verify identity of all collaborating entities (users, agents).
2. **Permission Management**: Implement granular permissions for shared resources.
3. **Session Security**: Secure collaboration sessions with proper lifecycle management.
4. **Role Separation**: Distinguish between observers, contributors, and administrators.

### Communication Security

1. **Channel Encryption**: Encrypt all collaboration channels.
2. **Message Integrity**: Verify message integrity to prevent tampering.
3. **Origin Validation**: Validate the source of all incoming messages.
4. **Replay Prevention**: Implement nonce or timestamp checks to prevent replay attacks.

### Data Protection

1. **Shared Resource Access**: Apply least-privilege access to shared resources.
2. **State Synchronization**: Secure state sync mechanisms against race conditions.
3. **Conflict Resolution**: Handle conflicts securely without data loss or corruption.
4. **Audit Trail**: Maintain comprehensive logs of all collaboration activities.

## Threat Model

| Threat | Impact | Mitigation |
|--------|--------|------------|
| Unauthorized entity joining | Data exposure | Entity authentication, invitation-only sessions |
| Message interception | Information disclosure | End-to-end encryption |
| Privilege escalation | Unauthorized actions | Strict permission enforcement |
| Session hijacking | Account compromise | Secure session tokens, timeout policies |
| State corruption | Data integrity loss | Atomic operations, conflict detection |

## Secure Implementation Patterns

```python
# Example: Secure collaboration session
class SecureCollaborationSession:
    def __init__(self, session_id: str, creator: Entity):
        self.session_id = session_id
        self.creator = creator
        self.participants: Dict[str, ParticipantRole] = {}
        self._lock = asyncio.Lock()

    async def add_participant(self, entity: Entity, role: ParticipantRole) -> bool:
        """Securely add a participant to the session."""
        async with self._lock:
            # Verify entity is authenticated
            if not entity.is_authenticated:
                logger.warning(f"Unauthenticated entity attempted join: {entity.id}")
                return False

            # Check if session accepts new participants
            if not self._can_accept_participants():
                return False

            # Verify invitation or permission
            if not self._has_join_permission(entity):
                audit_log.record_unauthorized_access(entity, self.session_id)
                return False

            self.participants[entity.id] = role
            audit_log.record_participant_joined(entity, self.session_id, role)
            return True
```

## Compliance

- All collaboration activities must be auditable
- Participant identities must be verifiable
- Shared data access must follow least-privilege principles

## Incident Response

1. **Session Compromise**: Immediately terminate affected sessions
2. **Unauthorized Access**: Revoke access and notify affected participants
3. **Data Breach**: Follow data breach notification procedures

## Vulnerability Reporting

Report security vulnerabilities via the main project's security reporting process.
