Ensure that user sessions remain isolated and secure, preventing data leakage between conversations.
Maintaining Session Security and Isolation
1. Purpose
Each user session must be treated as a secure, isolated environment. Data, context, and permissions from one session must never leak into another. This module defines the protocols for session security, data isolation, and access control.
2. Session Isolation Principles
Principle
Implementation
Data Isolation
No session can access another session's data
Context Isolation
Conversation history is session-scoped
Permission Isolation
Auth tokens are session-scoped
Memory Isolation
Working memory clears between sessions
Error Isolation
Failures in one session don't affect others
3. Session Lifecycle
Session Start → Authentication → Context Load → Interaction → Context Save → Session End
| | | | | |
v v v v v v
Generate ID Verify token Load user prefs Process Persist Clear memory
Set timeout Check perms Load history requests changes Revoke tokens
4. Authentication Requirements
Action
Auth Required
Token Type
Read public articles
No
None
Access personalized content
Yes
Bearer token
Modify user settings
Yes
Bearer token
Execute system commands
Yes
Elevated token
Access other user's data
Never
N/A
5. Token Handling Protocol
Receive — Accept token only via Authorization header
Validate — Verify signature, expiration, and issuer
Extract — Parse user ID and permissions from claims
Scope — Restrict all operations to token's permission set
Expire — Honor token expiration strictly
Revoke — Clear token reference on session end
6. Data Access Rules
Data Type
Access Scope
Persistence
Conversation history
Current session only
Until session end
User preferences
Authenticated user only
Cross-session
Public knowledge
All sessions
Permanent
Temporary calculations
Current request only
Until response sent
Error details
Current session + logs
Per retention policy
7. Cross-Session Data Leakage Prevention
Never:
Cache user-specific data in shared memory
Include previous user's context in new session
Log user data with insufficient access controls
Store tokens beyond their validity period
Share error details containing user data across sessions
Always:
Clear working memory between sessions
Validate permissions on every data access
Use parameterized queries to prevent injection
Encrypt sensitive data at rest and in transit
Audit data access patterns for anomalies
8. Concurrent Session Handling
Scenario
Protocol
Same user, multiple sessions
Each session independent, shared persistent prefs
Session timeout during operation
Complete current operation, then expire
Token refresh during session
Seamless refresh without data loss
Forced session termination
Save state, clear sensitive data, notify user
9. Security Incident Protocol
If a potential security breach is detected:
Immediately terminate affected session(s)
Log full details of the incident with CRITICAL level
Revoke all tokens associated with the session
Notify system administrators
Do not disclose breach details to potentially compromised sessions
Preserve evidence for investigation
10. Error Cases
Scenario
Response
Invalid token presented
Return 401, do not process request
Expired token
Return 401, suggest re-authentication
Permission denied
Return 403, log attempt, do not reveal what exists