Log: Add MaskAddress option to hide IP addresses (#3783)

* Log: Add maskAddress option

* Correct IPv6 subnet

app/log/config.pb.go

@@ -84,6 +84,7 @@ type Config struct {
 	AccessLogType LogType      `protobuf:"varint,4,opt,name=access_log_type,json=accessLogType,proto3,enum=xray.app.log.LogType" json:"access_log_type,omitempty"`
 	AccessLogPath string       `protobuf:"bytes,5,opt,name=access_log_path,json=accessLogPath,proto3" json:"access_log_path,omitempty"`
 	EnableDnsLog  bool         `protobuf:"varint,6,opt,name=enable_dns_log,json=enableDnsLog,proto3" json:"enable_dns_log,omitempty"`
+	MaskAddress   string       `protobuf:"bytes,7,opt,name=mask_address,json=maskAddress,proto3" json:"mask_address,omitempty"`
 }
 
 func (x *Config) Reset() {
@@ -160,13 +161,20 @@ func (x *Config) GetEnableDnsLog() bool {
 	return false
 }
 
+func (x *Config) GetMaskAddress() string {
+	if x != nil {
+		return x.MaskAddress
+	}
+	return ""
+}
+
 var File_app_log_config_proto protoreflect.FileDescriptor
 
 var file_app_log_config_proto_rawDesc = []byte{
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@@ -186,15 +194,18 @@ var file_app_log_config_proto_rawDesc = []byte{
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+	0x6f, 0x33,
 }
 
 var (

app/log/config.proto

@@ -23,4 +23,5 @@ message Config {
   LogType access_log_type = 4;
   string access_log_path = 5;
   bool enable_dns_log = 6;
+  string mask_address= 7;
 }

app/log/log.go

@@ -4,6 +4,9 @@ package log
 
 import (
 	"context"
+	"fmt"
+	"regexp"
+	"strings"
 	"sync"
 
 	"github.com/xtls/xray-core/common"
@@ -101,18 +104,25 @@ func (g *Instance) Handle(msg log.Message) {
 		return
 	}
 
+	var Msg log.Message
+	if g.config.MaskAddress != "" {
+		Msg = &MaskedMsgWrapper{Message: msg, config: g.config}
+	} else {
+		Msg = msg
+	}
+
 	switch msg := msg.(type) {
 	case *log.AccessMessage:
 		if g.accessLogger != nil {
-			g.accessLogger.Handle(msg)
+			g.accessLogger.Handle(Msg)
 		}
 	case *log.DNSLog:
 		if g.dns && g.accessLogger != nil {
-			g.accessLogger.Handle(msg)
+			g.accessLogger.Handle(Msg)
 		}
 	case *log.GeneralMessage:
 		if g.errorLogger != nil && msg.Severity <= g.config.ErrorLogLevel {
-			g.errorLogger.Handle(msg)
+			g.errorLogger.Handle(Msg)
 		}
 	default:
 		// Swallow
@@ -141,6 +151,56 @@ func (g *Instance) Close() error {
 	return nil
 }
 
+// MaskedMsgWrapper is to wrap the string() method to mask IP addresses in the log.
+type MaskedMsgWrapper struct {
+	log.Message
+	config *Config
+}
+
+func (m *MaskedMsgWrapper) String() string {
+	str := m.Message.String()
+
+	ipv4Regex := regexp.MustCompile(`(\d{1,3}\.){3}\d{1,3}`)
+	ipv6Regex := regexp.MustCompile(`((?:[\da-fA-F]{0,4}:[\da-fA-F]{0,4}){2,7})(?:[\/\\%](\d{1,3}))?`)
+
+	// Process ipv4
+	maskedMsg := ipv4Regex.ReplaceAllStringFunc(str, func(ip string) string {
+		parts := strings.Split(ip, ".")
+		switch m.config.MaskAddress {
+		case "half":
+			return fmt.Sprintf("%s.%s.*.*", parts[0], parts[1])
+		case "quarter":
+			return fmt.Sprintf("%s.*.*.*", parts[0])
+		case "full":
+			return "[Masked IPv4]"
+		default:
+			return ip
+		}
+	})
+
+	// process ipv6
+	maskedMsg = ipv6Regex.ReplaceAllStringFunc(maskedMsg, func(ip string) string {
+		parts := strings.Split(ip, ":")
+		switch m.config.MaskAddress {
+		case "half":
+			if len(parts) >= 2 {
+				return fmt.Sprintf("%s:%s::/32", parts[0], parts[1])
+			}
+		case "quarter":
+			if len(parts) >= 1 {
+				return fmt.Sprintf("%s::/16", parts[0])
+			}
+		case "full":
+			return "Masked IPv6" // Do not use [Masked IPv6] like ipv4, or you will get "[[Masked IPv6]]" (v6 address already has [])
+		default:
+			return ip
+		}
+		return ip
+	})
+
+	return maskedMsg
+}
+
 func init() {
 	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
 		return New(ctx, config.(*Config))

infra/conf/log.go

@@ -20,6 +20,7 @@ type LogConfig struct {
 	ErrorLog    string `json:"error"`
 	LogLevel    string `json:"loglevel"`
 	DNSLog      bool   `json:"dnsLog"`
+	MaskAddress string `json:"maskAddress"`
 }
 
 func (v *LogConfig) Build() *log.Config {
@@ -59,5 +60,6 @@ func (v *LogConfig) Build() *log.Config {
 	default:
 		config.ErrorLogLevel = clog.Severity_Warning
 	}
+	config.MaskAddress = v.MaskAddress
 	return config
 }