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libmodsecurity bajo FreeBSD + Nginx

 ·  🎃 kr0m

Como ya explicamos en artículos anteriores libmodsecurity es un WAF(Web Application Firewall), este nos permite detectar ciertos tipos de ataques en base a unas reglas predefinidas, mediante estas firmas podremos detectar inyecciones SQL, XSS, LFI, RFI. En esta ocasión vamos a montar un sistema en el que seremos noficiados vía Telegram cuando se detecte un ataque, se aplicarán reglas de PF y se mostrará una web donde se informará del motivo del baneo.

El artículo se divide en varias secciones:


Compilación de Nginx

Si ya tenemos instalado Nginx debemos consultar si fué compilado con soporte para libmodsecurity:

pkg info nginx|grep MODSECURITY3

 MODSECURITY3 : off

NOTA: La versión full(nginx-full) tampoco lleva la opción habilitada.


En versiones anteriores a 03 Jun 2020 18:49:04 Nginx debía ser compilado con soporte para modsecurity3, tener la librería modsecurity3 y además instalar el conector modsecurity3-nginx, en versiones posteriores a dicha fecha si compilamos Nginx con soporte para modsecurity3 ya lleva incorporado el conector, pero debemos añadir la orden de carga del módulo en la configuración de Nginx, en la versión vieja este paso era innecesario.

r537834 | joneum | 2020-06-03 20:49:04 +0200 (Wed, 03 Jun 2020) | 11 lines

Merge r532727 from www/nginx-devel:

Convert the following third-party modules to dynamic:

o) accept_language
o) modsecurity3-nginx

Fix the third-party auth_krb5 module build.

Sponsored by: Netzkommune GmbH

Si instalamos modsecurity3-nginx con la versión nueva de Nginx y cargamos el módulo desde la configuación de Nginx veremos el siguiente error:

2020/06/06 14:46:36 [emerg] 24011#101851: module "/usr/local/libexec/nginx/ngx_http_modsecurity_module.so" is not binary compatible in /usr/local/etc/nginx/nginx.conf:4

Además pkg nos advertirá de que el paquete modsecurity3-nginx y nginx entran en conflicto ya que los dos intentan instalar el mismo conector.


Compilamos mediante ports con las opciones que deseemos, nos aseguramos de habilitar modsecurity3 y recordad que una vez se dá el paso a ports hay que gestionar todos los paquetes desde ports, podéis encontrar mas información en este artículo anterior.

Antes de compilar e intalar Nginx desde los ports desinstalamos la versión actual.

pkg delete nginx

Preparamos el sistema de ports:

portsnap fetch extract
cd /usr/ports
make fetchindex

Realizamos una búsqueda:

make search name=nginx

Port:	nginx-1.22.1_5,3
Path:	/usr/ports/www/nginx
Info:	Robust and small WWW server
Maint:	joneum@FreeBSD.org
B-deps:	pcre-8.45_3
R-deps:	pcre-8.45_3
WWW:	https://nginx.com/

Configuramos las opciones:

cd /usr/ports/www/nginx
make config

Compilamos e instalamos:

make -j2
make install

Limpiamos ficheros temporales:

make clean


Instalación de libmodsecurity

Instalamos la librería libmodsecurity:

cd /usr/ports/security/modsecurity3
make config
make
make install
make clean

Nos bajamos las reglas de OWASP:

cd /usr/local
git clone https://github.com/SpiderLabs/owasp-modsecurity-crs.git
cd owasp-modsecurity-crs
cp crs-setup.conf.example crs-setup.conf

Nos bajamos el fichero de configuración base de libmodsecurity:

Nos aseguramos de tener ciertos parámetros con los valores indicados:

vi /usr/local/etc/modsec/modsecurity.conf

SecRuleEngine On
SecAuditLogFormat json
SecAuditEngine RelevantOnly
SecAuditLog /var/log/modsec_audit.log

Incluimos en la configuración principal el fichero base y las reglas de OWASP:

vi /usr/local/etc/modsec/main.conf

# Include the recommended configuration
Include /usr/local/etc/modsec/modsecurity.conf

# OWASP CRS v3 rules
Include /usr/local/owasp-modsecurity-crs/crs-setup.conf
Include /usr/local/owasp-modsecurity-crs/rules/*.conf

Habilitamos libmodsecurity en la configuración de Nginx añadiendo como primera línea el load del módulo:

vi /usr/local/etc/nginx/nginx.conf

load_module /usr/local/libexec/nginx/ngx_http_modsecurity_module.so;
vi /usr/local/etc/nginx/alfaexploit.conf
server {
 ...
 modsecurity on;
 modsecurity_rules_file /usr/local/etc/modsec/main.conf;

Reiniciamos el servicio:

service nginx restart

Probamos cualquier tipo de ataque, en mi caso una inyección MySQL con el siguiente payload:

' or '1==1'; --

Veremos una entrada nueva en el log y la petición web habrá sido bloqueada con un 403 Forbidden:

tail -f /var/log/modsec_audit.log

Si vamos a generar muchas entradas en el log es preferible escribirlas en formato concurrent, de este modo no se logearán en un fichero de texto de forma serializada, si no que se hará en distintos ficheros de forma paralela:

vi /usr/local/etc/modsec/modsecurity.conf

#SecAuditLogType Serial
SecAuditLogType Concurrent
#SecAuditLog /var/log/modsec_audit.log
SecAuditLogStorageDir /opt/modsecurity/var/audit

Reiniciamos el servicio:

service nginx restart

Creamos el directorio donde almacenar las entradas de log:

mkdir -p /opt/modsecurity/var/audit/
chown -R www:www /opt/modsecurity/var/audit/
chmod 775 /opt/modsecurity/var/audit/

Instalamos la herramienta jq, esta nos será útil para visualizar la información de los logs de forma mas cómoda:

cd /usr/ports/textproc/jq
make config
make
make install
make clean

Consultamos el campo message de una de las entradas:

cat /opt/modsecurity/var/audit/20230225/20230225-0902/20230225-090220-167731214042.620793 | jq ‘.transaction.messages[].message’

"SQL Injection Attack Detected via libinjection"
"Inbound Anomaly Score Exceeded (Total Score: 5)"

NOTA: No es necsario filtrar si queremos ver la información completa simplemente empipamos la salida del cat a un jq sin parámetros.


Whitelistear URLs

Si en nuestra aplicación web hay alguna funcionalidad que requiera un comportamiento un poco fuera de lo normal podemos whitelistearla para que las reglas no salten cuando se trate de esa sección:

cp /usr/local/owasp-modsecurity-crs/rules/REQUEST-900-EXCLUSION-RULES-BEFORE-CRS.conf.example /usr/local/owasp-modsecurity-crs/rules/REQUEST-900-EXCLUSION-RULES-BEFORE-CRS.conf
vi /usr/local/owasp-modsecurity-crs/rules/REQUEST-900-EXCLUSION-RULES-BEFORE-CRS.conf

SecRule REQUEST_URI "@beginsWith /CUSTOM_WEB_PATH" \
    "id:1001,\
    phase:1,\
    pass,\
    nolog,\
    ctl:ruleEngine=Off"

Deshabilitar reglas

Si por otro lado queremos deshabilitar alguna regla en concreto podemos utilizar la directiva SecRuleRemoveById

NOTA : Esta directiva debe ser especificada después de la regla que se esté deshabilitando.

En mi caso estaba teniendo problemas con la regla:

CGI source code leakage
"ruleId": "950140",
          "file": "/usr/local/owasp-modsecurity-crs/rules/RESPONSE-950-DATA-LEAKAGES.conf",
          "lineNumber": "66",

Al mostrar código por la web la alarma salta por pensar que se está filtrando código fuente de la propia página, añadimos el fichero de reglas deshabilitadas:

vi /usr/local/etc/modsec/main.conf

# Include the recommended configuration
Include /usr/local/etc/modsec/modsecurity.conf

# OWASP CRS v3 rules
Include /usr/local/owasp-modsecurity-crs/crs-setup.conf
Include /usr/local/owasp-modsecurity-crs/rules/*.conf

# Disabled rules
Include /usr/local/etc/modsec/disabledRules.conf

Indicamos que regla deshabilitar:

vi /usr/local/etc/modsec/disabledRules.conf

SecRuleRemoveById 950140

En cambio si queremos deshabilitarla solo para una IP(necesario si habilitamos el check en un Ha-Proxy):

vi /usr/local/etc/modsec/disabledRules.conf

SecRule REMOTE_ADDR "@ipMatch IP_ADDRESS" "id:1,phase:1,t:none,nolog,pass,ctl:ruleRemoveById=920280"
service nginx restart

Limpieza de logs

Una buena idea es eliminar los logs de libmodsecurity cada X tiempo, para ello yo tengo el siguiente CRON habilitado:

00 11 * * * /bin/rm -rf /usr/local/bastille/jails/MetaCortex/root/opt/modsecurity/var/audit/* >/dev/null 2>&1

Sistema de análisis de logs y baneo

El sistema se compone de un servidor Redis central y varios programas escritos en Go:

Según la función del servidor este deberá ejecutar un software u otro:

  • Nginx con libmodsecurity instalado: modsecurityanalizer
  • Servidor físico de jails: modsecuritynotifier

La idea es que los Nginx que estarán repartidos por varios servidores físicos en forma de jail, escriban en el Redis central.
Y los servidores físicos reconfiguren PF y los HaProxys(uno por servidor físico) en base a la información del Redis.

NOTA: En mi caso solo tengo un servidor físico, así que lo ejecutaré todo en el servidor padre y configuraré los paths para que se busquen los ficheros dentro del path de las jails(/usr/local/bastille/jails).


Instalación de Redis

Para que los distintos scripts puedan comunicarse, instalaremos un servidor Redis:

pkg install -y redis

Lo bindeamos a su ip y asignamos un password:

vi /usr/local/etc/redis.conf

bind 192.168.69.2
requirepass XXXXXXXXXX

Habilitamos y arrancamos el servicio:

sysrc redis_enable=yes
service redis start

Consultamos el estado del redis:

redis-cli -h 192.168.69.2 -a XXXXXXXXXX info

# Server
redis_version:7.0.8
redis_git_sha1:00000000
redis_git_dirty:0
redis_build_id:8e3f49544e856f48
redis_mode:standalone
os:FreeBSD 13.1-RELEASE-p5 amd64
.......

modsecurityAnalizer

Mediante este programa analizaremos los logs generados por libmodsecurity y generaremos las keys asociadas en Redis.

mkdir modsecurityAnalizer
cd modsecurityAnalizer
go mod init modsecurityAnalizer
go get github.com/fsnotify/fsnotify
go get github.com/redis/go-redis/v9

vi modsecurityAnalizer.go

package main
import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"time"
	"github.com/fsnotify/fsnotify"
	"github.com/redis/go-redis/v9"
)
const (
	apiKey      = "XXXXXXX"
	telegramURL = "https://api.telegram.org/bot%s/sendMessage"
	userID      = "XXXXXXX"
	haproxyIP   = "192.168.69.19"
	redisAddr   = "192.168.69.2:6379"
	redisPass   = "XXXXXXX"
	auditPath   = "/usr/local/bastille/jails/MetaCortex/root/opt/modsecurity/var/audit/"
)
var (
	ctx = context.Background()
	rdb *redis.Client
)
type ModSecLog struct {
	Transaction struct {
		TimeStamp string `json:"time_stamp"`
		ClientIP  string `json:"client_ip"`
		Request   struct {
			Method  string            `json:"method"`
			URI     string            `json:"uri"`
			Headers map[string]string `json:"headers"`
		} `json:"request"`
		Messages []struct {
			Message string `json:"message"`
			Details struct {
				Data string `json:"data"`
			} `json:"details"`
		} `json:"messages"`
	} `json:"transaction"`
}
func sendTelegram(msg string) {
	url := fmt.Sprintf(telegramURL, apiKey)
	payload, _ := json.Marshal(map[string]string{
		"chat_id": userID,
		"text":    msg,
	})
	resp, err := http.Post(url, "application/json", bytes.NewBuffer(payload))
	if err != nil {
		fmt.Printf("++ Error sending telegram: %v\n", err)
		return
	}
	defer resp.Body.Close()
}
func processFile(path string) {
	// Short pause for ModSecurity to finish writing in FreeBSD
	time.Sleep(250 * time.Millisecond)
	content, err := os.ReadFile(path)
	if err != nil || len(content) == 0 {
		return
	}
	// Clean possible null characters at the end of the JSON
	content = bytes.Trim(content, "\x00")
	var log ModSecLog
	if err := json.Unmarshal(content, &log); err != nil {
		// Retry: ModSecurity sometimes wraps the JSON in an array []
		var logs []ModSecLog
		if err2 := json.Unmarshal(content, &logs); err2 == nil && len(logs) > 0 {
			log = logs[0]
		} else {
			return
		}
	}
	foundAlert := false
	for _, msgLine := range log.Transaction.Messages {
		message := msgLine.Message
		if message == "" || strings.Contains(message, "Anomaly Score Exceeded") {
			continue
		}
		attacker := log.Transaction.Request.Headers["x-forwarded-for"]
		if attacker == "" {
			attacker = log.Transaction.ClientIP
		}
		// Ignore if the attacker is our own HAProxy or is empty
		if attacker == haproxyIP || attacker == "" {
			continue
		}
		foundAlert = true
		fmt.Printf("[%s] ATTACK DETECTED: %s -> %s\n", time.Now().Format("15:04:05"), attacker, message)
		// Increment counter in Redis
		rdb.Incr(ctx, attacker)
		rdb.Expire(ctx, attacker, time.Hour)
		// Save detailed data
		data := []string{
			log.Transaction.TimeStamp,
			attacker,
			log.Transaction.Request.Headers["sec-ch-ua-platform"],
			log.Transaction.Request.Headers["user-agent"],
			message,
			log.Transaction.Request.Headers["host"],
			log.Transaction.Request.URI,
			log.Transaction.Request.Method,
			msgLine.Details.Data,
		}
		rdb.Set(ctx, "data"+attacker, strings.Join(data, "++"), time.Hour)
	}
	if !foundAlert {
		fmt.Printf("[-] File processed (no alerts): %s\n", filepath.Base(path))
	}
}
func main() {
	rdb = redis.NewClient(&redis.Options{
		Addr:     redisAddr,
		Password: redisPass,
		DB:       0,
	})
	if err := rdb.Ping(ctx).Err(); err != nil {
		fmt.Println("++ ERROR: Cannot connect to Redis")
		os.Exit(1)
	}
	watcher, err := fsnotify.NewWatcher()
	if err != nil {
		panic(err)
	}
	defer watcher.Close()
	// Function to add folders to the monitoring system (kqueue)
	watchDir := func(path string) {
		err := watcher.Add(path)
		if err == nil {
			fmt.Printf("[*] Monitoring: %s\n", path)
		}
	}
	// Initial scan of the entire audit structure
	filepath.Walk(auditPath, func(path string, info os.FileInfo, err error) error {
		if err == nil && info.IsDir() {
			watchDir(path)
		}
		return nil
	})
	fmt.Println("\n-- ModSecurity Analyzer online. Waiting for attacks...")
	for {
		select {
		case event, ok := <-watcher.Events:
			if !ok {
				return
			}
			// Capture creation of folders or files
			if event.Has(fsnotify.Create) || event.Has(fsnotify.Write) {
				info, err := os.Stat(event.Name)
				if err != nil {
					continue
				}
				if info.IsDir() {
					// If ModSecurity creates a subfolder (e.g.: 20260228-1250), we monitor it right away
					watchDir(event.Name)
					
					// Preventive scan in case ModSecurity created files before Go reacted
					filepath.Walk(event.Name, func(p string, i os.FileInfo, e error) error {
						if e == nil && !i.IsDir() {
							processFile(p)
						} else if e == nil && i.IsDir() && p != event.Name {
							watchDir(p)
						}
						return nil
					})
				} else {
					// It's a JSON log file: to be processed
					processFile(event.Name)
				}
			}
		case err, ok := <-watcher.Errors:
			if !ok {
				return
			}
			fmt.Printf("Watcher Error: %v\n", err)
		}
	}
}

Compilamos y copiamos el binario al sistema:

go build
cp modsecurityAnalizer /usr/local/bin

El script RC de gestión del servicio quedaría del siguiente modo:

vi /usr/local/etc/rc.d/modsecurityAnalizer

#!/bin/sh
#
# PROVIDE: modsecurityAnalizer
# REQUIRE: DAEMON
# KEYWORD: shutdown
. /etc/rc.subr
name=modsecurityAnalizer
rcvar=modsecurityAnalizer_enable
command="/usr/local/bin/modsecurityAnalizer"
start_cmd="modsecurityAnalizer_start"
stop_cmd="${name}_stop"
status_cmd="${name}_status"
pidfile="/var/run/${name}.pid"
modsecurityAnalizer_start(){
    echo "Starting modsecurityAnalizer (Go version)."
    /usr/sbin/daemon -c -f -p ${pidfile} ${command}
}
modsecurityAnalizer_stop(){
    if [ -f ${pidfile} ]; then
        echo "Stopping service: ${name}"
        kill -s TERM $(cat ${pidfile})
        rm -f ${pidfile}
        sleep 3
    else
        echo "It appears ${name} is not running."
    fi
}
modsecurityAnalizer_status(){
    if [ -f ${pidfile} ] && kill -0 $(cat ${pidfile}) 2>/dev/null; then
        echo "${name} running with PID: $(cat ${pidfile})"
    else
        echo "It appears ${name} is not running."
        [ -f ${pidfile} ] && rm -f ${pidfile}
    fi
}
load_rc_config $name
run_rc_command "$1"

Asignamos permisos:

chmod 655 /usr/local/etc/rc.d/modsecurityAnalizer
chown root:wheel /usr/local/etc/rc.d/modsecurityAnalizer

Habilitamos el servicio y lo arrancamos:

sysrc modsecurityAnalizer_enable=“yes”
service modsecurityAnalizer start


modsecurityNotifier

Este programa consultará el Redis, avisará vía Telegram de los ataques recibidos, configurará reglas PF y mantendrá una ACL-RAM y una lista de HaProxy con las ips de los atacantes.

La razón por la que configuraremos ACLs y listas simultáneamente es porque las ACLs se insertarán por SocketAdmin de HaProxy, al reiniciar el HaProxy las ACLs desaparecen, para evitar esto mantendremos también la lista /usr/local/etc/badguys.list de este modo en caso de reinicio la lista contendrá las mismas ips que habían en la ACL.

mkdir modsecurityNotifier
cd modsecurityNotifier/
go mod init modsecurityNotifier
go get github.com/redis/go-redis/v9
vi modsecurityNotifier.go
package main
import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"github.com/redis/go-redis/v9"
	"io"
	"net"
	"net/http"
	"os"
	"os/exec"
	"path/filepath"
	"regexp"
	"strconv"
	"strings"
	"time"
)
const (
	ApiKey                = "XXXXXXXXXXXXXX"
	TelegramUrl           = "https://api.telegram.org/bot" + ApiKey + "/sendMessage"
	UserId                = "XXXXXXXXXXXXXX"
	HaProxyBlacklistFile  = "/usr/local/bastille/jails/Atlas/root/usr/local/etc/badguys.list"
	HaProxyAdminSocketDir = "/usr/local/bastille/jails/Atlas/root/var/run/"
	BadguysAclPattern     = `.*\(/usr/local/etc/badguys\.list\) pattern loaded from file '/usr/local/etc/badguys\.list'.*`
)
var ctx = context.Background()
type TelegramPayload struct {
	ChatID string `json:"chat_id"`
	Text   string `json:"text"`
}
func sendTelegram(text string) {
	payload := TelegramPayload{
		ChatID: UserId,
		Text:   text,
	}
	jsonData, _ := json.Marshal(payload)
	resp, err := http.Post(TelegramUrl, "application/json", bytes.NewBuffer(jsonData))
	if err != nil {
		fmt.Printf("++ Error sending telegram message: %v\n", err)
		return
	}
	defer resp.Body.Close()
}
func getPFBannedHosts() []string {
	cmd := exec.Command("pfctl", "-t", "badguys", "-T", "show")
	output, err := cmd.Output()
	if err != nil {
		return []string{}
	}
	lines := strings.Split(string(output), "\n")
	var hosts []string
	for _, line := range lines {
		trimmed := strings.TrimSpace(line)
		if trimmed != "" {
			hosts = append(hosts, trimmed)
		}
	}
	return hosts
}
// Interacting with HAProxy via Unix Socket
func haproxyCommand(cmd string) (string, error) {
	// Look for the socket in the specified directory
	files, _ := filepath.Glob(filepath.Join(HaProxyAdminSocketDir, "*.sock"))
	if len(files) == 0 {
		// Try direct path if no dynamic .sock files are found
		files = append(files, filepath.Join(HaProxyAdminSocketDir, "haproxy.sock"))
	}
	var lastErr error
	for _, socketPath := range files {
		conn, err := net.Dial("unix", socketPath)
		if err != nil {
			lastErr = err
			continue
		}
		defer conn.Close()
		fmt.Fprintf(conn, cmd+"\n")
		var buf bytes.Buffer
		io.Copy(&buf, conn)
		return buf.String(), nil
	}
	return "", fmt.Errorf("cant connect with HAProxy socket: %v", lastErr)
}
func main() {
	rdb := redis.NewClient(&redis.Options{
		Addr:     "192.168.69.2:6379",
		Password: "XXXXXXXXXXXXXX",
		DB:       0,
	})
	if err := rdb.Ping(ctx).Err(); err != nil {
		hostname, _ := os.Hostname()
		msg := fmt.Sprintf("ERROR %s (modsecurityNotifier.go): Cant connect to redis server", hostname)
		fmt.Println("++ " + msg)
		sendTelegram(msg)
		os.Exit(1)
	}
	for {
		fmt.Println("\n------------------------------------------------")
		fmt.Println(">> Checking REDIS content")
		fmt.Println("------------------------------------------------")
		iter := rdb.Scan(ctx, 0, "*", 0).Iterator()
		for iter.Next(ctx) {
			attacker := iter.Val()
			if strings.HasPrefix(attacker, "data") || strings.HasPrefix(attacker, "geoipdata") {
				continue
			}
			// Always ignore localhost
			if attacker == "127.0.0.1" || attacker == "::1" {
				continue
			}
			rediscounter, _ := rdb.Get(ctx, attacker).Result()
			count, _ := strconv.Atoi(rediscounter)
			if count >= 5 {
				dataStr, err := rdb.Get(ctx, "data"+attacker).Result()
				if err == nil {
					parts := strings.Split(dataStr, "++")
					if len(parts) >= 9 {
						timestamp := parts[0]
						ip := parts[1]
						uaPlatform := parts[2]
						ua := parts[3]
						message := parts[4]
						host := parts[5]
						url := parts[6]
						method := parts[7]
						payload := parts[8]
						fmt.Printf("Attacker: %s Counter: %s\n", attacker, rediscounter)
						fmt.Printf("timestamp: %s\nattacker: %s\nmethod: %s\n", timestamp, ip, method)
						
						// PF Ban check
						bannedHosts := getPFBannedHosts()
						isBanned := false
						for _, bh := range bannedHosts {
							if bh == ip {
								isBanned = true
								break
							}
						}
						if !isBanned {
							fmt.Printf("-- Banning time for: %s\n", ip)
							exec.Command("/sbin/pfctl", "-t", "badguys", "-T", "add", ip).Run()
							exec.Command("/sbin/pfctl", "-k", ip).Run()
							
							// Update HAProxy File
							f, err := os.OpenFile(HaProxyBlacklistFile, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
							if err == nil {
								f.WriteString(ip + "\n")
								f.Close()
							}
							
							// Update HAProxy Runtime ACL
							aclResp, err := haproxyCommand("show acl")
							if err == nil {
								re := regexp.MustCompile(BadguysAclPattern)
								lines := strings.Split(aclResp, "\n")
								aclID := ""
								for _, line := range lines {
									if re.MatchString(line) {
										fields := strings.Fields(line)
										if len(fields) > 0 {
											aclID = strings.TrimPrefix(fields[0], "#")
											break
										}
									}
								}
								if aclID != "" {
									haproxyCommand(fmt.Sprintf("add acl #%s %s", aclID, ip))
								}
							}
							
							// Send Telegram Alerts
							sendTelegram("-- Banning time for: " + ip + " https://badguys.alfaexploit.com/")
							alertMsg := fmt.Sprintf("Date: %s\nAttacker: %s\nUA Platform: %s\nUA: %s\nHost: %s\nUrl: %s\nAlert: %s\nPayload: %s",
								timestamp, ip, uaPlatform, ua, host, url, message, payload)
							sendTelegram(alertMsg)
						}
					}
				}
			}
		}
		
		// Cleanup PF
		pfHosts := getPFBannedHosts()
		for _, bh := range pfHosts {
			exists, _ := rdb.Exists(ctx, bh).Result()
			if exists == 0 {
				fmt.Printf(">> PF Unbanning: %s\n", bh)
				exec.Command("/sbin/pfctl", "-t", "badguys", "-T", "delete", bh).Run()
			}
		}
		
		// Cleanup HAProxy File
		if _, err := os.Stat(HaProxyBlacklistFile); err == nil {
			input, _ := os.ReadFile(HaProxyBlacklistFile)
			lines := strings.Split(string(input), "\n")
			var newLines []string
			for _, line := range lines {
				ip := strings.TrimSpace(line)
				if ip == "" {
					continue
				}
				exists, _ := rdb.Exists(ctx, ip).Result()
				if exists > 0 {
					newLines = append(newLines, ip)
				} else {
					fmt.Printf(">> Unblacklisting HAProxy (file): %s\n", ip)
				}
			}
			os.WriteFile(HaProxyBlacklistFile, []byte(strings.Join(newLines, "\n")+"\n"), 0644)
		}
		
		// Cleanup HAProxy Runtime ACL
		aclResp, err := haproxyCommand("show acl")
		if err == nil {
			re := regexp.MustCompile(BadguysAclPattern)
			lines := strings.Split(aclResp, "\n")
			for _, line := range lines {
				if re.MatchString(line) {
					fields := strings.Fields(line)
					id := strings.TrimPrefix(fields[0], "#")
					content, _ := haproxyCommand("show acl #" + id)
					contentLines := strings.Split(content, "\n")
					for _, cLine := range contentLines {
						cFields := strings.Fields(cLine)
						if len(cFields) >= 2 {
							entryIP := cFields[1]
							exists, _ := rdb.Exists(ctx, entryIP).Result()
							if exists == 0 {
								// Do not unban localhost
								if entryIP != "127.0.0.1" && entryIP != "::1" {
									fmt.Printf(">> Unblacklisting HAProxy (RAM-ACL): %s\n", entryIP)
									haproxyCommand(fmt.Sprintf("del acl #%s %s", id, entryIP))
								}
							}
						}
					}
				}
			}
		}
		time.Sleep(5 * time.Second)
	}
}

Compilamos y copiamos el binario al sistema:

go build
cp modsecurityNotifier /usr/local/bin

El script RC de gestión del servicio quedaría del siguiente modo:

vi /usr/local/etc/rc.d/modsecurityNotifier

#!/bin/sh
#
# PROVIDE: modsecurityNotifier
# REQUIRE: DAEMON
# KEYWORD: shutdown
. /etc/rc.subr
name=modsecurityNotifier
rcvar=modsecurityNotifier_enable
command="/usr/local/bin/modsecurityNotifier"
pidfile="/var/run/${name}.pid"
start_cmd="modsecurityNotifier_start"
stop_cmd="modsecurityNotifier_stop"
status_cmd="modsecurityNotifier_status"
modsecurityNotifier_start() {
    if [ -f "${pidfile}" ] && kill -0 $(cat "${pidfile}") 2>/dev/null; then
        echo "${name} already running."
    else
        echo "Starting ${name}..."
        /usr/sbin/daemon -c -f -p ${pidfile} ${command}
    fi
}
modsecurityNotifier_stop() {
    if [ -f "${pidfile}" ]; then
        echo "Stopping ${name}..."
        kill -s INT $(cat ${pidfile})
        rm -f ${pidfile}
        echo "Stopped."
    else
        echo "${name} is not running."
    fi
}
modsecurityNotifier_status() {
    if [ -f "${pidfile}" ] && kill -0 $(cat "${pidfile}") 2>/dev/null; then
        echo "${name} is running with PID: $(cat ${pidfile})"
    else
        echo "${name} is not running."
    fi
}
load_rc_config $name
run_rc_command "$1"

Asignamos permisos:

chmod 655 /usr/local/etc/rc.d/modsecurityNotifier
chown root:wheel /usr/local/etc/rc.d/modsecurityNotifier

Habilitamos y arrancamos el servicio:

sysrc modsecurityNotifier_enable=yes
service modsecurityNotifier start


Reglas de filtrado PF

Para bloquear el tráfico desde PF utilizaremos una tabla llamada badguys, todo el tráfico proveniente de estas ips será bloqueado con la excepción del puerto 80/443:

vi /etc/pf.conf

ext_if = "nfe0"

set block-policy return
scrub in on $ext_if all fragment reassemble
set skip on lo

table <badguys> persist
table <jails> persist

nat on $ext_if from <jails> to any -> ($ext_if:0)
rdr-anchor "rdr/*"

antispoof for $ext_if inet

block log all
pass out quick

pass in proto tcp to 192.168.69.2 port 7777

# SMTP -> HellStorm
pass in proto tcp to 192.168.69.17 port 25

# HTTP/HTTPS -> Atlas
pass in proto tcp to 192.168.69.19 port 80
pass in proto tcp to 192.168.69.19 port 443

# Continue attending badguys in HA-Proxy, we have a surprise for them:
pass in quick proto tcp from <badguys> to 192.168.69.19 port 80
pass in quick proto tcp from <badguys> to 192.168.69.19 port 443

# Xbox -> Paradox
pass in proto tcp from 192.168.69.196 to 192.168.69.18 port 80
# TARS -> Paradox
pass in proto tcp from 192.168.69.198 to 192.168.69.18 port 80
# Garrus -> Paradox, testing purpose
pass in proto tcp from 192.168.69.4 to 192.168.69.18 port 80

pass in proto tcp to any port 22

# Block all traffic from badguys, except 80,443 that was allowed previously:
block in from <badguys>

Configuración Ha-Proxy

Como ya hemos comentado, la idea es mantener sincronizadas las ACLs de HA-Proxy en running-config utilizando el AdminSocket y una lista de ips en un fichero en el sistema de ficheros, de este modo si se reinicia el Ha-Proxy todo seguirá funcionando, ya que leerá el fichero que también tiene la lista de ips.

La configuración del Ha-Proxy quedaría del siguiente modo:

vi /usr/local/etc/haproxy.conf

global
    daemon
    maxconn 5000
    log 192.168.69.19:514 local1
    user nobody
    group nobody
    stats socket /var/run/haproxy.sock user nobody group nobody mode 660 level admin

    ssl-default-bind-ciphers ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256
    ssl-default-bind-options ssl-min-ver TLSv1.2 no-tls-tickets
    
defaults
    timeout connect 10s
    timeout client 30s
    timeout server 30s
    mode http
    # ENABLE LOGGING:
    # TCP connections
    #log global
    # Backend connections
    #option httplog

listen stats
    bind *:8404
    stats enable
    stats uri /stats
    stats refresh 5s
    stats auth kr0m:8XEn3EL1aYIeKI

frontend HTTP
    bind :80
    # Allow LetsEncrypt certificate renew and redirect to HTTPS all other requests:
    acl letsencrypt path_beg /.well-known/acme-challenge/
    http-request redirect scheme https unless letsencrypt
    use_backend letsencrypt-backend if letsencrypt

frontend HTTP-SSL
    bind :443 ssl crt /usr/local/etc/haproxy_certs.pem
    http-request add-header X-Forwarded-Proto https

    acl mail hdr_dom(host) mail.alfaexploit.com
    acl prometheus hdr_dom(host) prometheus.alfaexploit.com
    acl grafana hdr_dom(host) grafana.alfaexploit.com
    acl gdrive hdr_dom(host) gdrive.alfaexploit.com
    acl www_alfaexploit hdr_dom(host) www.alfaexploit.com
    acl badguys_alfaexploit hdr_dom(host) badguys.alfaexploit.com
    acl alfaexploit hdr_dom(host) alfaexploit.com

    http-request deny deny_status 400 if !mail !prometheus !grafana !gdrive !www_alfaexploit !badguys_alfaexploit !alfaexploit

    # Show banned list to anyone who wants to view it
    use_backend badguys if badguys_alfaexploit

    # Route Badguys traffic:
    acl badguy_ips src -f /usr/local/etc/badguys.list
    use_backend badguys if badguy_ips

    # Order matters because acl alfaexploit -> alfaexploit.com is the most generic that covers all of them
    use_backend mail if mail
    use_backend prometheus if prometheus
    use_backend prometheus if grafana
    use_backend gdrive if gdrive
    use_backend alfaexploit if www_alfaexploit
    use_backend alfaexploit if alfaexploit

backend letsencrypt-backend
    server letsencrypt 192.168.69.19:88

backend mail
    server HellStorm 192.168.69.17:80 check send-proxy-v2

backend prometheus
    server RECLog 192.168.69.21:80 check send-proxy-v2

backend gdrive
    server Paradox 192.168.69.18:8080 check send-proxy-v2

backend alfaexploit
    server MetaCortex 192.168.69.20:80 check send-proxy-v2

backend badguys
    http-request set-path / unless { path_beg /images }
    server Atlas 192.168.69.19:8888 check send-proxy-v2

Dashboard atacantes

En el servidor donde tendremos la dashboard de atacantes instalaremos Nginx y PHP:

pkg install nginx php82 php82-pecl-redis

Habilitamos y arrancamos el servicio PHP:

sysrc php_fpm_enable=yes
service php-fpm start

Incluimos nuestra configuración desde el fichero global de Nginx:

vi /usr/local/etc/nginx/nginx.conf

http {
    include       badguys.conf;
vi /usr/local/etc/nginx/badguys.conf
server {
    listen 192.168.69.19:8888 proxy_protocol;
    server_name badguys.alfaexploit.com;

    set_real_ip_from 192.168.69.19;
    real_ip_header proxy_protocol;

    root   /usr/local/www/nginx;
    index index.php;

    location ~ \.php$ {
      try_files $uri =404;
      include fastcgi_params;
      fastcgi_index index.php;
      fastcgi_split_path_info ^(.+\.php)(.*)$;
      fastcgi_keep_conn on;
      fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
      fastcgi_pass 127.0.0.1:9000;
    }
}

Habilitamos y arrancamos el servicio Nginx:

sysrc nginx_enable=yes
service nginx start

Creamos el directorio donde almacenar los logos de los sistemas operativos:

mkdir /usr/local/www/nginx/images

Nos bajamos los logos de los sistemas operativos:

cd /usr/local/www/nginx/images
wget https://alfaexploit.com/files/libmodSecurityFreeBSD/images.tar.gz
tar xvzf images.tar.gz<>

El código de la dashboard sería el siguiente:

vi /usr/local/www/nginx/index.php

<?php
$os_array = [
    'windows nt 10'                              =>  'WindowsNT',
    'windows nt 6.3'                             =>  'WindowsNT',
    'windows nt 6.2'                             =>  'WindowsNT',
    'windows nt 6.1|windows nt 7.0'              =>  'WindowsNT',
    'windows nt 6.0'                             =>  'WindowsNT',
    'windows nt 5.2'                             =>  'WindowsNT',
    'windows nt 5.1'                             =>  'WindowsNT',
    'windows xp'                                 =>  'WindowsXP',
    'windows nt 5.0|windows nt5.1|windows 2000'  =>  'WindowsNT',
    'windows me'                                 =>  'WindowsME',
    'windows nt 4.0|winnt4.0'                    =>  'WindowsNT',
    'windows ce'                                 =>  'WindowsCE',
    'windows 98|win98'                           =>  'Windows98',
    'windows 95|win95'                           =>  'Windows95',
    'win16'                                      =>  'Windows16',
    'mac os x 10.1[^0-9]'                        =>  'MacOS',
    'macintosh|mac os x'                         =>  'MacOS',
    'mac_powerpc'                                =>  'MacOS',
    'ubuntu'                                     =>  'Linux',
    'iphone'                                     =>  'iPhone',
    'ipod'                                       =>  'iPod',
    'ipad'                                       =>  'iPad',
    'android'                                    =>  'Android',
    'blackberry'                                 =>  'BlackBerry',
    'webos'                                      =>  'WebOS',
    'linux'                                      =>  'Linux',

    '(media center pc).([0-9]{1,2}\.[0-9]{1,2})'=>'WindowsMediaCenter',
    '(win)([0-9]{1,2}\.[0-9x]{1,2})'=>'Windows',
    '(win)([0-9]{2})'=>'Windows',
    '(windows)([0-9x]{2})'=>'Windows',

    'Win 9x 4.90'=>'WindowsME',
    '(windows)([0-9]{1,2}\.[0-9]{1,2})'=>'Windows',
    'win32'=>'Windows',
    '(java)([0-9]{1,2}\.[0-9]{1,2}\.[0-9]{1,2})'=>'Java',
    '(Solaris)([0-9]{1,2}\.[0-9x]{1,2}){0,1}'=>'Solaris',
    'dos x86'=>'DOS',
    'Mac OS X'=>'MacOS',
    'Mac_PowerPC'=>'MacOS',
    '(mac|Macintosh)'=>'MacOS',
    '(sunos)([0-9]{1,2}\.[0-9]{1,2}){0,1}'=>'SunOS',
    '(beos)([0-9]{1,2}\.[0-9]{1,2}){0,1}'=>'BeOS',
    '(risc os)([0-9]{1,2}\.[0-9]{1,2})'=>'RISCOS',
    'unix'=>'Unix',
    'os/2'=>'OS2',
    'freebsd'=>'FreeBSD',
    'openbsd'=>'OpenBSD',
    'netbsd'=>'NetBSD',
    'irix'=>'IRIX',
    'plan9'=>'Plan9',
    'aix'=>'AIX',
    'GNU Hurd'=>'GNUHurd',
    '(fedora)'=>'Linux',
    '(kubuntu)'=>'Linux',
    '(ubuntu)'=>'Linux',
    '(debian)'=>'Linux',
    '(CentOS)'=>'Linux',
    '(Mandriva).([0-9]{1,3}(\.[0-9]{1,3})?(\.[0-9]{1,3})?)'=>'Linux',
    '(SUSE).([0-9]{1,3}(\.[0-9]{1,3})?(\.[0-9]{1,3})?)'=>'Linux',
    '(Dropline)'=>'Linux',
    '(ASPLinux)'=>'Linux',
    '(Red Hat)'=>'Linux',
    '(linux)'=>'Linux',
    '(amigaos)([0-9]{1,2}\.[0-9]{1,2})'=>'AmigaOS',
    'amiga-aweb'=>'AmigaOS',
    'amiga'=>'AmigaOS',
    'AvantGo'=>'PalmOS',
    '[0-9]{1,2}\.[0-9]{1,2}\.[0-9]{1,3}'=>'Linux',
    '(webtv)/([0-9]{1,2}\.[0-9]{1,2})'=>'WebTV',
    'Dreamcast'=>'DreamcastOS',
    'GetRight'=>'Windows',
    'go!zilla'=>'Windows',
    'gozilla'=>'Windows',
    'gulliver'=>'Windows',
    'ia archiver'=>'Windows',
    'NetPositive'=>'Windows',
    'mass downloader'=>'Windows',
    'microsoft'=>'Windows',
    'offline explorer'=>'Windows',
    'teleport'=>'Windows',
    'web downloader'=>'Windows',
    'webcapture'=>'Windows',
    'webcollage'=>'Windows',
    'webcopier'=>'Windows',
    'webstripper'=>'Windows',
    'webzip'=>'Windows',
    'wget'=>'Wget',
    'Java'=>'Java',
    'flashget'=>'FlashGet',

    'MS FrontPage'=>'Windows',
    '(msproxy)/([0-9]{1,2}.[0-9]{1,2})'=>'Windows',
    '(msie)([0-9]{1,2}.[0-9]{1,2})'=>'Windows',
    'libwww-perl'=>'Perl',
    'UP.Browser'=>'WindowsCE',
    'NetAnts'=>'Windows',
];

function user_agent_os($user_agent, $os_array) {
    foreach ($os_array as $regex => $value) {
        if (preg_match('{\b('.$regex.')\b}i', $user_agent)) {
            return $value;
            #$key = array_rand($os_array);
            #$value = $os_array[$key];
            #return $value;
        }
    }
    return 'Unknown';
}

function secs_to_str ($duration) {
    $periods = array(
        'day' => 86400,
        'hour' => 3600,
        'minute' => 60,
        'second' => 1
    );
 
    $parts = array();
 
    foreach ($periods as $name => $dur) {
        $div = floor($duration / $dur);
 
        if ($div == 0)
            continue;
        else
            if ($div == 1)
                $parts[] = $div . " " . $name;
            else
                $parts[] = $div . " " . $name . "s";
        $duration %= $dur;
    }
 
    $last = array_pop($parts);
 
    if (empty($parts))
        return $last;
    else
        return join(', ', $parts) . " and " . $last;
}

if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
    $ip_address = $_SERVER['HTTP_CLIENT_IP'];
}
elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
    $ip_address = $_SERVER['HTTP_X_FORWARDED_FOR'];
}
else {
    $ip_address = $_SERVER['REMOTE_ADDR'];
}

$redis = new Redis();
$redis->connect('192.168.69.2', 6379);
$redis->auth('XXXXXXXX');

$allKeys = $redis->keys('*');

echo "<!DOCTYPE html>";
echo "<html>";
echo "<head>";

echo "<style>";
echo ".attacker_data {";
echo "position: relative;";
echo "top: -6px;";
echo "padding-left: 8px;";
echo "}";

echo "table, td, th {";
echo "border: 1px solid black;";
echo "margin-bottom: 15px;";
echo "}";

echo "table {";
echo "  border-collapse: collapse;";
echo "  width: 100%;";
echo "}";

echo "td {";
echo "  text-align: center;";
echo "}";
echo "</style>";

echo "</head>";
echo "<body>";

echo "<table>";
echo "<tr>";
echo "<td>Date</td>";
echo "<td>IP</td>";
echo "<td>I'm watching you</td>";
echo "<td>Attack</td>";
echo "<td>Unban remaining time</td>";
echo "</tr>";
foreach ($allKeys as $key) {
    $attacker_data = array();
    if (str_starts_with($key, 'data')) {
        $counter_key = substr($key, 4);
        $counter = $redis->get($counter_key);
        if ($counter >= 5){
            $ttl = $redis->ttl($key);
            $ttl_human = secs_to_str($ttl);
            $raw_data = $redis->get($key);
            $data = explode("++", $raw_data);
            $i = 0;
            # We are iterating Redis data: 0-> Date, 1 -> attacker_ip, 2 -> useragent_platform, 3 -> useragent, 4 -> message
            $get_os_from_useragent = False;
            foreach ($data as $field) {
                $field = trim($field);
                if ($i == 0) {
                    $attacker_data[] = $field;
                } elseif ($i == 1) {
                    $attacker_ip = $field;

                    ## We have limits requesting /ip-api.com url so we try to cache it
                    if ($redis->exists('geoipdata'.$attacker_ip)) {
                        $geoipdata = ($redis->get('geoipdata'.$attacker_ip));
                        $attacker_data[] = $geoipdata;
                    } else {
                        $ips = array();
                        $ips[] = $field;
                        $endpoint = 'http://ip-api.com/batch';
                        $options = [
                            'http' => [
                                    'method' => 'POST',
                                    'user_agent' => 'AlfaExploit/1.0',
                                    'header' => 'Content-Type: application/json',
                                    'content' => json_encode($ips)
                            ]
                        ];
                        
                        if (($response = @file_get_contents($endpoint, false, stream_context_create($options))) === false) {
                            $attacker_data[] = 'UNKNOWN';
                            # Cache data: 3600s -> 1h
                            $redis->set('geoipdata'.$attacker_ip, 'UNKNOWN');
                            $redis->expire('geoipdata'.$attacker_ip, 3600);
                        } else {
                            $array = json_decode($response, true);
                            $status = $array[0]['status'];
                            if ($status == 'fail' ){
                               $attacker_data[] = $array[0]['message'];
                               # Cache data: 3600s -> 1h
                               $redis->set('geoipdata'.$attacker_ip, $array[0]['message']);
                               $redis->expire('geoipdata'.$attacker_ip, 3600);
                            } else {
                               $country = $array[0]['country'];
                               $regionName = $array[0]['regionName'];
                               $lat = $array[0]['lat'];
                               $lon = $array[0]['lon'];
                               $isp = $array[0]['isp'];
                               $attacker_data[] = $country.'/'.$regionName.'('.$lat.' '.$lon.')'. $isp;
                               # Cache data: 3600s -> 1h
                               $redis->set('geoipdata'.$attacker_ip, $country.'/'.$regionName.'('.$lat.' '.$lon.')'. $isp);
                               $redis->expire('geoipdata'.$attacker_ip, 3600);
                            }
                        }
                   }
                } elseif ($i == 2) {
                    # useragent_platform is NULL, continue, we will try to get it from user-agent
                    if ($field == 'NULL') {
                        $get_os_from_useragent = True;
                    } else {
                        $attacker_data[] = str_replace('"', '', $field);;
                    }
                } elseif ($i == 3 && $get_os_from_useragent) {
                    # Try to get OS from user-agent
                    $attacker_data[] = user_agent_os($field, $os_array);
                } elseif ($i == 4) {
                    $attacker_data[] = $field;
                }
                $i = $i + 1;
            }

            # Print table data
            echo "<tr>";
            # DATE:
            echo "<td>$attacker_data[0]</td>";
            # IP:
            if ($ip_address == $attacker_ip) {
                echo "<td><span style=\"color:#E20D41;\">$attacker_ip</span></td>";
            } else {
                echo "<td>$attacker_ip</td>";
            }
            # ATTACKER DATA
            echo "<td><img src=/images/$attacker_data[2].png><span class='attacker_data'>$attacker_data[1]</span></td>";
            echo "<td>$attacker_data[3]</td>";
            echo "<td>$ttl_human</td>";
            echo "</tr>";
        }
    }
}
echo "</table>";
echo '<a href="https://t.me/AlfaExploia">Telegram channel</a> Email: echo \'a3IwbSAoYXQpIGFsZmFleHBsb2l0IChkb3QpIGNvbQo=\' | base64 -d';
echo '<form action="https://alfaexploit.com">';
echo '<button type="submit">AlfaExploit</button>';
echo '</form>';
echo "</body>";
echo "</html>";

Programas útiles

Este programa nos permitirá ver de forma rápida los atacantes baneados:

mkdir showBadGuys
cd showBadGuys
go mod init showBadGuys
go get github.com/redis/go-redis/v9

vi showBadGuys.go
package main
import (
	"bufio"
	"bytes"
	"context"
	"fmt"
	"io"
	"net"
	"os"
	"os/exec"
	"path/filepath"
	"regexp"
	"strings"
	"time"
	"github.com/redis/go-redis/v9"
)
const (
	HaProxyBlacklistFile  = "/usr/local/bastille/jails/Atlas/root/usr/local/etc/badguys.list"
	HaProxyAdminSocketDir = "/usr/local/bastille/jails/Atlas/root/var/run/"
	BadguysAclPattern     = `.*\(/usr/local/etc/badguys\.list\) pattern loaded from file '/usr/local/etc/badguys\.list'.*`
)
var ctx = context.Background()
// Function to interact with HAProxy via Unix Socket
func haproxyCommand(cmd string) (string, error) {
	files, _ := filepath.Glob(filepath.Join(HaProxyAdminSocketDir, "*.sock"))
	if len(files) == 0 {
		files = append(files, filepath.Join(HaProxyAdminSocketDir, "haproxy.sock"))
	}
	var lastErr error
	for _, socketPath := range files {
		conn, err := net.Dial("unix", socketPath)
		if err != nil {
			lastErr = err
			continue
		}
		defer conn.Close()
		fmt.Fprintf(conn, cmd+"\n")
		var buf bytes.Buffer
		io.Copy(&buf, conn)
		return buf.String(), nil
	}
	return "", fmt.Errorf("could not connect to socket: %v", lastErr)
}
// Format seconds to H:MM:SS
func formatDuration(d time.Duration) string {
	d = d.Round(time.Second)
	h := d / time.Hour
	d -= h * time.Hour
	m := d / time.Minute
	d -= m * time.Minute
	s := d / time.Second
	return fmt.Sprintf("%02d:%02d:%02d", h, m, s)
}
func main() {
	// 1. REDIS Connection
	rdb := redis.NewClient(&redis.Options{
		Addr:     "192.168.69.2:6379",
		Password: "XXXXXXXXXXX",
		DB:       0,
	})
	if err := rdb.Ping(ctx).Err(); err != nil {
		fmt.Println("++ ERROR: Cannot connect to Redis server")
		return
	}
	fmt.Println("\n---------------")
	fmt.Println(">> REDIS")
	fmt.Println("---------------")
	iter := rdb.Scan(ctx, 0, "*", 0).Iterator()
	for iter.Next(ctx) {
		attacker := iter.Val()
		if strings.HasPrefix(attacker, "data") || strings.HasPrefix(attacker, "geoipdata") {
			continue
		}
		rediscounter, _ := rdb.Get(ctx, attacker).Result()
		ttl, _ := rdb.TTL(ctx, attacker).Result()
		
		fmt.Printf("> Attacker: %s Counter: %s\n", attacker, rediscounter)
		fmt.Printf("TTL: %d RemainingTime: %s\n", int(ttl.Seconds()), formatDuration(ttl))
		if count := 0; count >= 0 { // Banned logic
			c, _ := fmt.Sscanf(rediscounter, "%d", &count)
			if c > 0 && count >= 5 {
				fmt.Println("Banned: YES")
			} else {
				fmt.Println("Banned: NO")
			}
		}
		// Additional data (data+attacker)
		dataStr, err := rdb.Get(ctx, "data"+attacker).Result()
		if err == nil {
			parts := strings.Split(dataStr, "++")
			if len(parts) >= 9 {
				fmt.Printf("timestamp: %s\n", parts[0])
				fmt.Printf("useragent_platform: %s\n", parts[2])
				fmt.Printf("useragent: %s\n", parts[3])
				fmt.Printf("message: %s\n", parts[4])
				fmt.Printf("host: %s\n", parts[5])
				fmt.Printf("url: %s\n", parts[6])
				fmt.Printf("method: %s\n", parts[7])
			}
		}
	}
	// 2. PF Section
	fmt.Println("\n---------------")
	fmt.Println(">> PF")
	fmt.Println("---------------")
	pfCmd := exec.Command("pfctl", "-t", "badguys", "-T", "show")
	pfOut, _ := pfCmd.Output()
	fmt.Printf("PF Banned hosts: \n%s", string(pfOut))
	
	// 3. HA-Proxy FILE Section
	fmt.Println("\n----------------")
	fmt.Println(">> HA-Proxy FILE")
	fmt.Println("----------------")
	if _, err := os.Stat(HaProxyBlacklistFile); err == nil {
		file, _ := os.Open(HaProxyBlacklistFile)
		scanner := bufio.NewScanner(file)
		for scanner.Scan() {
			fmt.Println(scanner.Text())
		}
		file.Close()
	}
	// 4. HA-Proxy ACL Section
	fmt.Println("\n----------------")
	fmt.Println(">> HA-Proxy ACL")
	fmt.Println("---------------")
	
	aclResp, err := haproxyCommand("show acl")
	if err != nil {
		fmt.Printf("ERROR: %v\n", err)
	} else {
		re := regexp.MustCompile(BadguysAclPattern)
		lines := strings.Split(aclResp, "\n")
		aclID := ""
		for _, line := range lines {
			if re.MatchString(line) {
				fields := strings.Fields(line)
				if len(fields) > 0 {
					aclID = strings.TrimPrefix(fields[0], "#")
					break
				}
			}
		}
		if aclID != "" {
			content, _ := haproxyCommand("show acl #" + aclID)
			cLines := strings.Split(content, "\n")
			for _, cLine := range cLines {
				cFields := strings.Fields(cLine)
				if len(cFields) >= 2 {
					fmt.Println(cFields[1]) // The second field is the IP/Pattern
				}
			}
		}
	}
}

Compilamos y copiamos el binario al sistema:

go build
cp showBadGuys /usr/local/bin/

Al ejecutarlo veremos la siguiente salida:

---------------
>> REDIS
---------------
> Attacker: 192.168.69.202 Counter: 19
TTL: 3522 RemainingTime: 0:58:42
Banned: YES
timestamp: Sat Feb 25 12:56:26 2023
useragent_platform: "Linux"
useragent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36
message: SQL Injection Attack Detected via libinjection

---------------
>> PF
---------------
PF Banned hosts: 
   192.168.69.202


----------------
>> HA-Proxy FILE
----------------
192.168.69.202

----------------
>> HA-Proxy ACL
---------------
192.168.69.202

Otra función realmente útil es poder flushear todos los baneos:

mkdir flushBadGuys
cd flushBadGuys
go mod init flushBadGuys
go get github.com/redis/go-redis/v9

vi flushBadGuys.go
package main
import (
	"bytes"
	"context"
	"fmt"
	"io"
	"net"
	"os"
	"os/exec"
	"path/filepath"
	"regexp"
	"strings"
	"github.com/redis/go-redis/v9"
)
const (
	HaProxyBlacklistFile  = "/usr/local/bastille/jails/Atlas/root/usr/local/etc/badguys.list"
	HaProxyAdminSocketDir = "/usr/local/bastille/jails/Atlas/root/var/run/"
	BadguysAclPattern     = `badguys\.list`
)
var ctx = context.Background()
// haproxyExecute handles multiple commands in a single session
func haproxyExecute(commands []string) (string, error) {
	files, _ := filepath.Glob(filepath.Join(HaProxyAdminSocketDir, "*.sock"))
	if len(files) == 0 {
		files = append(files, filepath.Join(HaProxyAdminSocketDir, "haproxy.sock"))
	}
	var lastErr error
	for _, socketPath := range files {
		conn, err := net.Dial("unix", socketPath)
		if err != nil {
			lastErr = err
			continue
		}
		defer conn.Close()
		for _, cmd := range commands {
			fmt.Fprintf(conn, cmd+"\n")
		}
		var buf bytes.Buffer
		io.Copy(&buf, conn)
		return buf.String(), nil
	}
	return "", fmt.Errorf("no connection to HAProxy socket: %v", lastErr)
}
func main() {
	// 1. REDIS FLUSH
	rdb := redis.NewClient(&redis.Options{Addr: "192.168.69.2:6379", Password: "XXXXXXXX", DB: 0})
	fmt.Println("\n>> REDIS: Flushing database...")
	if err := rdb.FlushDB(ctx).Err(); err != nil {
		fmt.Printf("   Error: %v\n", err)
	} else {
		fmt.Println("   Success: Redis database cleared.")
	}
	// 2. PF FLUSH
	fmt.Println("\n>> PF: Flushing table 'badguys'...")
	if err := exec.Command("pfctl", "-t", "badguys", "-T", "flush").Run(); err != nil {
		fmt.Printf("   Error: %v\n", err)
	} else {
		fmt.Println("   Success: PF table cleared.")
	}
	// 3. FILE TRUNCATE
	fmt.Println("\n>> FILE: Truncating 'badguys.list'...")
	if err := os.WriteFile(HaProxyBlacklistFile, []byte(""), 0644); err != nil {
		fmt.Printf("   Error: %v\n", err)
	} else {
		fmt.Println("   Success: File truncated.")
	}
	// 4. HA-PROXY ACL FLUSH
	fmt.Println("\n>> HA-PROXY: Searching for ACL-Badguys...")
	resp, err := haproxyExecute([]string{"show acl"})
	if err != nil {
		fmt.Printf("   Socket Error: %v\n", err)
		return
	}
	re := regexp.MustCompile(BadguysAclPattern)
	lines := strings.Split(resp, "\n")
	var targetAcls []string
	for _, line := range lines {
		if re.MatchString(line) {
			fields := strings.Fields(line)
			if len(fields) > 0 {
				// Your HAProxy returns ID as the first field (e.g., "12")
				id := strings.TrimPrefix(fields[0], "#")
				targetAcls = append(targetAcls, id)
			}
		}
	}
	if len(targetAcls) == 0 {
		fmt.Println("   Notice: No ACL linked to 'badguys.list' was found.")
		return
	}
	for _, id := range targetAcls {
		fmt.Printf("   Action: Cleaning entries for ACL-Badguys (ID: %s)...\n", id)
		
		// Attempting fast clear (HAProxy 2.2+)
		clearResp, _ := haproxyExecute([]string{fmt.Sprintf("clear acl #%s", id)})
		
		// Fallback to manual deletion if 'clear' is unsupported
		if strings.Contains(clearResp, "Unknown command") {
			fmt.Println("   Fallback: 'clear' command unsupported. Deleting entries manually...")
			content, _ := haproxyExecute([]string{fmt.Sprintf("show acl #%s", id)})
			cLines := strings.Split(content, "\n")
			
			var delCmds []string
			count := 0
			for _, cLine := range cLines {
				cFields := strings.Fields(cLine)
				// Format: [reference] [value/IP]
				if len(cFields) >= 2 {
					ip := cFields[1]
					delCmds = append(delCmds, fmt.Sprintf("del acl #%s %s", id, ip))
					count++
				}
			}
			
			if len(delCmds) > 0 {
				haproxyExecute(delCmds)
				fmt.Printf("   Success: %d entries removed from ACL-Badguys.\n", count)
			} else {
				fmt.Println("   Notice: ACL-Badguys was already empty.")
			}
		} else {
			fmt.Println("   Success: ACL-Badguys flushed via 'clear acl'.")
		}
	}
	fmt.Println("\n>> Cleanup process completed successfully.")
}

Compilamos y copiamos el binario al sistema:

go build
cp flushBadGuys /usr/local/bin/

Al ejecutarlo veremos la siguiente salida:

>> REDIS: Flushing database...
   Success: Redis database cleared.

>> PF: Flushing table 'badguys'...
   Success: PF table cleared.

>> FILE: Truncating 'badguys.list'...
   Success: File truncated.

>> HA-PROXY: Searching for ACL-Badguys...
   Action: Cleaning entries for ACL-Badguys (ID: 12)...
   Success: ACL-Badguys flushed via 'clear acl'.

>> Cleanup process completed successfully.

Resultado final

Las notificaciones en Telegram tendrán este aspecto:

Y el dashboard este: