Mountain/IPC/Permission/Audit/

LogEvent.rs

//! # Audit
//!
//! ## File: IPC/Permission/Audit/LogEvent.rs
//!
//! ## Role in Mountain Architecture
//!
//! Provides comprehensive security event logging and audit trail functionality
//! for IPC operations, enabling security compliance monitoring, forensic
//! analysis, and performance tracking.
//!
//! ## Primary Responsibility
//!
//! Log security events for audit trails including permission checks, access
//! attempts, security violations, and configuration changes.
//!
//! ## Secondary Responsibilities
//!
//! - Manage log storage with automatic rotation
//! - Export audit logs to JSON format
//! - Filter and query events by user, type, severity, or date range
//! - Track performance anomalies for optimization
//! - Maintain bounded log size to prevent memory exhaustion
//! - Provide builder pattern for flexible event creation
//!
//! ## Dependencies
//!
//! **External Crates:**
//! - `std::collections::VecDeque` - Bounded log storage with efficient rotation
//! - `std::sync::Arc` - Shared ownership across threads
//! - `tokio::sync::RwLock` - Async-safe concurrent access
//! - `log` - Event logging infrastructure
//! - `serde` - Serialization for JSON export
//! - `serde_json` - JSON formatting
//! - `chrono` - Timestamp management (optional, falls back to std::time)
//!
//! **Internal Modules:**
//! - `Validate::ValidatePermission::{Permission, SecurityContext}` - Permission
//!   context
//! - `Role::ManageRole::Role` - Role change events
//!
//! ## Dependents
//!
//! - `Validate::ValidatePermission` - Logs permission validation results
//! - `Role::ManageRole` - Logs role management operations
//! - `TauriIPCServer` - Logs all IPC security events
//! - `Send` - Logs message transmission events
//! - `Receive` - Logs message reception events
//!
//! ## VSCode Pattern Reference
//!
//! Inspired by VSCode's audit logging in
//! `vs/platform/telemetry/common/telemetryService.ts`
//! - Structured event logging with contextual metadata
//! - Severity classification for event filtering
//! - Bounded buffer for log rotation
//! - Export capabilities for compliance reporting
//!
//! ## Security Considerations
//!
//! - All security events logged for compliance auditing
//! - PII (Personally Identifiable Information) sanitized by default
//! - IpAddresses optionally redacted based on privacy settings
//! - Sensitive details masked before log export
//! - Log access controlled through RBAC (not implemented in this module)
//! - Tamper-evident logging via hash chain (future enhancement)
//! - Log injection prevented via input validation
//! - Memory bounds prevent log-based denial of service
//!
//! ## Performance Considerations
//!
//! - VecDeque provides O(1) push/pop for log rotation
//! - RwLock allows concurrent reads, exclusive writes
//! - Index-based filtering is O(n) in worst case but acceptable
//! - JSON export performed lazily, not on every log event
//! - Bounded log size (1000 events) provides constant memory profile
//! - Log rotation is amortized O(1) per event
//! - Async logging prevents blocking main thread
//!
//! ## Error Handling Strategy
//!
//! - Returns Result for explicit error handling
//! - Partial log export succeeds even if some events fail serialization
//! - Invalid event data sanitized rather than causing failure
//! - Log overflow handled via rotation, not error
//! - Malformed filter criteria default to empty result
//! - JSON export errors logged but don't crash
//!
//! ## Thread Safety
//!
//! - RwLock wrapped in Arc for safe concurrent access
//! - Multiple concurrent reads, exclusive writes
//! - Lock contention minimized by short critical sections
//! - Event struct is Clone for safe sharing
//!
//! ## TODO Items
//!
//! - [ ] Implement hash chain for tamper-evident logging
//! - [ ] Add persistent log storage to disk
//! - [ ] Implement log compression for archival
//! - [ ] Add anonymization options for PII redaction
//! - [ ] Support structured queries (SQL-like syntax)
//! - [ ] Add real-time alerting for critical events
//! - [ ] Implement log aggregation across multiple instances

use std::{
	collections::VecDeque,
	net::IpAddr,
	sync::Arc,
	time::{Duration, SystemTime, UNIX_EPOCH},
};

use tokio::sync::RwLock;
use log::{debug, error, info, warn};
use serde::{Deserialize, Serialize};

/// Maximum number of events to store in the audit log
/// bounded to prevent memory exhaustion
const MAX_LOG_SIZE:usize = 1000;

/// Default timeout for log operations in milliseconds
const LOG_TIMEOUT_MS:u64 = 5000;

/// Security event type categorization for audit trail classification
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum SecurityEventType {
	/// Access was granted to a resource or operation
	AccessGranted,
	/// Access was denied due to insufficient permissions
	PermissionDenied,
	/// Authentication attempt failed
	AuthenticationFailed,
	/// Application configuration was modified
	ConfigurationChange,
	/// Security policy was violated
	SecurityViolation,
	/// Performance anomaly detected
	PerformanceAnomaly,
	/// User role was changed
	RoleChange,
	/// Permission was added, removed, or modified
	PermissionChange,
	/// Security policy was updated
	PolicyChange,
}

impl SecurityEventType {
	/// Get display name for event type
	pub fn DisplayName(&self) -> String {
		match self {
			SecurityEventType::AccessGranted => String::from("AccessGranted"),
			SecurityEventType::PermissionDenied => String::from("PermissionDenied"),
			SecurityEventType::AuthenticationFailed => String::from("AuthenticationFailed"),
			SecurityEventType::ConfigurationChange => String::from("ConfigurationChange"),
			SecurityEventType::SecurityViolation => String::from("SecurityViolation"),
			SecurityEventType::PerformanceAnomaly => String::from("PerformanceAnomaly"),
			SecurityEventType::RoleChange => String::from("RoleChange"),
			SecurityEventType::PermissionChange => String::from("PermissionChange"),
			SecurityEventType::PolicyChange => String::from("PolicyChange"),
		}
	}
}