Julien Infra Hostinger Security

Hostinger Security Management

Security infrastructure for srv759970.hstgr.cloud.

Server Info

Observability

First: At the start of execution, display:

🔧 Skill "julien-infra-hostinger-security" activated

1. Fail2ban Management

Tous les Jails Actifs

ATTENTION: Le jail opcode-auth bannit les IPs qui recoivent trop de 401. Si tu accèdes à un site protégé sans credentials, tu peux te faire bannir !

Status Check

ssh srv759970 'sudo fail2ban-client status'
ssh srv759970 'sudo fail2ban-client status wordpress-auth'
ssh srv759970 'sudo fail2ban-client status opcode-auth'

Ban/Unban IP (via fail2ban)

# Ban
ssh srv759970 'sudo fail2ban-client set wordpress-auth banip 1.2.3.4'

# Unban
ssh srv759970 'sudo fail2ban-client set wordpress-auth unbanip 1.2.3.4'

# Unban from all jails
ssh srv759970 'sudo fail2ban-client unban 1.2.3.4'

View Recent Attacks

ssh srv759970 'sudo grep "Ban" /var/log/fail2ban.log | tail -20'

2. nftables (Mécanisme de ban réel)

IMPORTANT: Fail2ban utilise nftables (pas iptables). Les bans sont stockés dans nftables !

Voir toutes les IPs bannies

# Voir la structure complète
ssh srv759970 'nft list ruleset | head -40'

# Voir les IPs bannies par jail spécifique
ssh srv759970 'nft list set inet f2b-table addr-set-opcode-auth'
ssh srv759970 'nft list set inet f2b-table addr-set-sshd'

Débannir une IP manuellement (nftables)

# Débannir de opcode-auth
ssh srv759970 'nft delete element inet f2b-table addr-set-opcode-auth { 1.2.3.4 }'

# Débannir de sshd
ssh srv759970 'nft delete element inet f2b-table addr-set-sshd { 1.2.3.4 }'

3. Whitelist (ignoreip)

Voir la whitelist actuelle

ssh srv759970 'grep ignoreip /etc/fail2ban/jail.local'

Ajouter une IP à la whitelist

# 1. Éditer le fichier
ssh srv759970 'sudo nano /etc/fail2ban/jail.local'
# Modifier la ligne ignoreip = ... en ajoutant l'IP

# 2. Recharger fail2ban
ssh srv759970 'sudo fail2ban-client reload'

4. Troubleshooting: Port 443 bloqué intermittent

Symptômes: Le site fonctionne quelques minutes puis devient inaccessible (timeout).

Cause probable: Ton IP est bannie par fail2ban (trop de 401).

Diagnostic rapide

# 1. Test port local vs externe
ssh srv759970 'curl -sk https://localhost -o /dev/null -w "%{http_code}"'  # Doit retourner 200/401
curl -sk https://69.62.108.82 -o /dev/null -w "%{http_code}"               # Si timeout = banni

# 2. Vérifier si ton IP est dans nftables
ssh srv759970 'nft list ruleset | grep -E "91\.164|TON_IP"'

# 3. Si trouvée, débannir
ssh srv759970 'nft delete element inet f2b-table addr-set-opcode-auth { TON_IP }'

# 4. Ajouter à whitelist (permanent)
# Éditer /etc/fail2ban/jail.local, ajouter IP à ignoreip
ssh srv759970 'sudo fail2ban-client reload'

Checklist diagnostic complet

# UFW status (devrait être inactif ou autoriser 443)
ssh srv759970 'ufw status'

# Nginx écoute sur 443 ?
ssh srv759970 'ss -tulpn | grep :443'

# Règles nftables (chercher DROP/REJECT)
ssh srv759970 'nft list ruleset | grep -E "reject|drop"'

# Fail2ban jails actifs
ssh srv759970 'fail2ban-client status'

5. WordPress Security Audit

Scoring System

7 Audit Categories (30 checks)

1. Nginx Security (8 checks, 25%)
2. File Permissions (6 checks, 15%)
3. WordPress Config (5 checks, 20%)
4. Users & Auth (4 checks, 15%)
5. Plugins & Themes (3 checks, 10%)
6. Database (2 checks, 10%)
7. Fail2ban (2 checks, 5%)

Quick Security Checks

# Nginx security headers
ssh srv759970 'curl -sI https://site.srv759970.hstgr.cloud | grep -iE "x-frame|x-content|strict-transport"'

# Server info exposure
ssh srv759970 'curl -sI https://site.srv759970.hstgr.cloud | grep -iE "server:|x-powered"'

# wp-config.php permissions
ssh srv759970 'ls -la /opt/wordpress-site/wp-config.php'

# Admin users
ssh srv759970 'docker exec wp-cli-site wp user list --role=administrator'

# Plugin updates
ssh srv759970 'docker exec wp-cli-site wp plugin list --update=available'

6. Infrastructure Audit

What It Discovers

• Docker containers and images
• Scripts (150+ locations)
• Cron jobs
• Systemd services
• PM2 processes
• Orphan resources

Quick Audit Commands

# All containers
ssh srv759970 'docker ps -a --format "table {{.Names}}\t{{.Status}}"'

# Docker disk usage
ssh srv759970 'docker system df'

# Orphan volumes
ssh srv759970 'docker volume ls -f dangling=true'

# Orphan images
ssh srv759970 'docker images -f dangling=true'

# Cron jobs
ssh srv759970 'crontab -l && sudo crontab -l'

# PM2 processes
ssh srv759970 'pm2 list'

7. Security Hardening

Nginx Security Headers

Add to server block:

add_header X-Frame-Options "SAMEORIGIN" always;
add_header X-Content-Type-Options "nosniff" always;
add_header X-XSS-Protection "1; mode=block" always;
add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
add_header Referrer-Policy "strict-origin-when-cross-origin" always;

Hide Server Info

# In /etc/nginx/nginx.conf
server_tokens off;

WordPress Hardening

# Disable file editing
ssh srv759970 'docker exec wp-cli-site wp config set DISALLOW_FILE_EDIT true'

# Set secure permissions
ssh srv759970 'docker exec -u root wordpress-site chmod 640 /var/www/html/wp-config.php'

8. Emergency Response

Under Attack

# Check who's attacking
ssh srv759970 'sudo grep "Ban" /var/log/fail2ban.log | tail -50'
ssh srv759970 'sudo tail -f /var/log/nginx/access.log | grep -E "wp-login|xmlrpc"'

# Ban attacker
ssh srv759970 'sudo fail2ban-client set wordpress-hard banip ATTACKER_IP'

# Check banned IPs
ssh srv759970 'sudo fail2ban-client status wordpress-auth'

Suspected Breach

# Check admin users
ssh srv759970 'docker exec wp-cli-site wp user list --role=administrator'

# Check recent logins
ssh srv759970 'docker exec wp-cli-site wp user list --field=user_login,user_registered'

# Check modified files
ssh srv759970 'find /opt/wordpress-site -mtime -1 -type f | head -50'

Quick Reference

# === FAIL2BAN ===
ssh srv759970 'sudo fail2ban-client status'                    # Status tous jails
ssh srv759970 'sudo fail2ban-client status opcode-auth'        # Status jail spécifique
ssh srv759970 'sudo fail2ban-client set wordpress-auth banip X.X.X.X'   # Ban IP
ssh srv759970 'sudo fail2ban-client unban X.X.X.X'             # Unban de tous les jails

# === NFTABLES (bans réels) ===
ssh srv759970 'nft list set inet f2b-table addr-set-opcode-auth'  # Voir IPs bannies
ssh srv759970 'nft delete element inet f2b-table addr-set-opcode-auth { X.X.X.X }'  # Débannir

# === WHITELIST ===
ssh srv759970 'grep ignoreip /etc/fail2ban/jail.local'         # Voir whitelist
# Pour ajouter: éditer jail.local puis fail2ban-client reload

# === DIAGNOSTIC PORT 443 ===
ssh srv759970 'curl -sk https://localhost -w "%{http_code}"'   # Test local (doit marcher)
curl -sk https://69.62.108.82 -w "%{http_code}"                # Test externe (si timeout = banni)
ssh srv759970 'nft list ruleset | grep -E "91\.164|TON_IP"'    # Chercher ton IP dans bans

# === AUTRES ===
ssh srv759970 'curl -sI https://site.com | grep -iE "x-frame|x-content|strict"'  # Headers
ssh srv759970 'sudo grep "Ban" /var/log/fail2ban.log | tail -20'                 # Attaques récentes