Added all of the existing code

security_enhancements.go

@@ -0,0 +1,106 @@
+package main
+
+import (
+	"crypto/tls"
+	"net"
+	"time"
+)
+
+// Advanced security and authentication
+type SecurityConfig struct {
+	RateLimit struct {
+		Enable      bool `json:"enable"`
+		MaxRequests int  `json:"max_requests"`
+		Window      int  `json:"window_seconds"`
+		BanDuration int  `json:"ban_duration"`
+	} `json:"rate_limit"`
+
+	GeoBlocking struct {
+		Enable    bool     `json:"enable"`
+		Whitelist []string `json:"whitelist_countries"`
+		Blacklist []string `json:"blacklist_countries"`
+	} `json:"geo_blocking"`
+
+	TwoFactor struct {
+		Enable   bool     `json:"enable"`
+		Methods  []string `json:"methods"` // totp, sms, email
+		Required bool     `json:"required_for_opers"`
+	} `json:"two_factor"`
+
+	SASL struct {
+		Enable     bool     `json:"enable"`
+		Mechanisms []string `json:"mechanisms"` // PLAIN, EXTERNAL, SCRAM-SHA-256
+		Required   bool     `json:"required"`
+	} `json:"sasl"`
+}
+
+// Rate limiting per IP/user
+type RateLimiter struct {
+	connections map[string]*ConnectionLimit
+	messages    map[string]*MessageLimit
+}
+
+type ConnectionLimit struct {
+	IP       net.IP
+	Count    int
+	LastSeen time.Time
+	Banned   bool
+	BanUntil time.Time
+}
+
+type MessageLimit struct {
+	Count      int
+	LastReset  time.Time
+	Violations int
+}
+
+// Certificate-based authentication
+type CertAuth struct {
+	Enable      bool              `json:"enable"`
+	RequiredCAs []string          `json:"required_cas"`
+	UserMapping map[string]string `json:"user_mapping"` // cert fingerprint -> username
+	AutoOper    bool              `json:"auto_oper"`
+}
+
+// OAuth integration
+type OAuthConfig struct {
+	Providers map[string]OAuthProvider `json:"providers"`
+}
+
+type OAuthProvider struct {
+	ClientID     string `json:"client_id"`
+	ClientSecret string `json:"client_secret"`
+	AuthURL      string `json:"auth_url"`
+	TokenURL     string `json:"token_url"`
+	UserInfoURL  string `json:"user_info_url"`
+}
+
+// DDoS protection
+type DDoSProtection struct {
+	Enable             bool `json:"enable"`
+	MaxConnections     int  `json:"max_connections_per_ip"`
+	ConnectionRate     int  `json:"max_connections_per_minute"`
+	SynFloodProtection bool `json:"syn_flood_protection"`
+}
+
+// Implement security features
+func (s *Server) CheckRateLimit(ip net.IP) bool {
+	// Check if IP is rate limited
+	return true
+}
+
+func (s *Server) ValidateCertificate(cert *tls.Certificate) bool {
+	// Validate client certificate
+	return true
+}
+
+func (s *Server) AuthenticateOAuth(provider, token string) (*UserInfo, error) {
+	// OAuth authentication
+	return nil, nil
+}
+
+type UserInfo struct {
+	Username string
+	Email    string
+	Verified bool
+}