feat: Implement session management and limits (#142)#159
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- Add SessionConfig for configurable session limits: - max_sessions_per_user: Limit concurrent sessions per user - max_total_sessions: Limit total concurrent sessions - idle_timeout: Detect idle sessions - session_timeout: Optional maximum session duration - Enhance SessionManager with per-user tracking: - user_sessions HashMap for tracking sessions by username - authenticate_session() method with per-user limit enforcement - touch() method for updating last_activity timestamp - get_idle_sessions() for timeout detection - get_stats() for session statistics - list_sessions() / list_user_sessions() for admin operations - kill_session() / kill_user_sessions() for forced disconnect - Add SessionError and SessionStats types - Enhance SessionInfo with activity tracking: - last_activity field for idle detection - idle_secs() and is_idle() methods - is_expired() for session timeout checks - Integrate per-user limits in SSH handler: - Check per-user session limits during authentication - Reject authentication if user has too many sessions - Update SessionManager's user tracking on auth success - Add session config to ServerConfig: - max_sessions_per_user field - session_timeout_secs field - session_config() helper method - Comprehensive test coverage (30+ new tests)
- Fix HIGH: Race condition in Drop - add retry mechanism with exponential backoff to ensure session cleanup under lock contention - Fix MEDIUM: Add input validation for SessionConfig - clamp max_sessions_per_user and max_total_sessions to minimum of 1 to prevent misconfiguration that could deny all connections - Add validate() method to SessionConfig for detecting potentially problematic configuration combinations - Fix MEDIUM: Atomic ordering - change SessionId counter from Ordering::Relaxed to Ordering::SeqCst for stricter ordering guarantees and consistent logging - Add tests for config validation and clamping behavior
- Fix code formatting issues (handler.rs, session.rs) - Fix unused variable warning in test (s2 -> _s2) - Add comprehensive session management documentation - Document session_timeout configuration option - Add session management API examples
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Merge origin/main into feat/session-management-142. Both branches added new builder methods - kept all three: - scp_enabled (from main) - max_sessions_per_user (from current branch) - session_timeout_secs (from current branch)
inureyes
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priority:medium
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Summary
Implements session management features including per-user session limits, idle timeout detection, and session tracking.
Changes
SessionConfig: Configurable session limits
max_sessions_per_user: Limit concurrent sessions per user (default: 10)max_total_sessions: Limit total concurrent sessions (default: 1000)idle_timeout: Duration for idle detection (default: 1 hour)session_timeout: Optional maximum session durationSessionManager enhancements:
user_sessionsHashMapauthenticate_session()with per-user limit enforcementtouch()for updating last activity timestampget_idle_sessions()for timeout detectionSessionInfo activity tracking:
last_activityfield for idle detectionidle_secs(),is_idle(),is_expired()methodsSSH handler integration:
Configuration:
max_sessions_per_user,session_timeout_secssession_config()helper for creating SessionConfigTest plan
Closes #142