Ubuntu 20.04. Tengo una gran cantidad de registros en mi /var/log/nginx/access.log que se ven así:
85.249.25.218 - - [15/Dec/2020:08:12:15 +0300] "POST /api/v1/device/analytics HTTP/1.1" 404 162 "-" "okhttp/4.8.1"
He instalado fail2ban, el contenido de mi /etc/fail2ban/jail.local es:
[sshd]
enabled = true
maxretry = 3
findtime = 1w
bantime = 4w
protocol = all
port = all
banaction = iptables-allports
[nginx-botsearch]
enabled = true
maxretry = 3
findtime = 1w
bantime = 4w
protocol = all
port = all
logpath = %(nginx_error_log)s
banaction = iptables-allports
[nginx-custom2]
enabled = true
maxretry = 3
findtime = 1w
bantime = 4w
protocol = all
port = all
logpath = %(nginx_access_log)s
banaction = iptables-allports
Filtrar /etc/fail2ban/filter.d/nginx-custom2.conf:
[Definition]
failregex = ^<HOST>.*GET \/api\/v1\/device\/.*
^<HOST>.*POST \/api\/v1\/device\/.*
^<HOST>.*PUT \/api\/v1\/device\/.*
ignoreregex =
Fail2ban prohíbe las IP que me interesan y las coloca en iptables, mi resultado de fail2ban-client -v status nginx-custom2 es:
Status for the jail: nginx-custom2
|- Filter
| |- Currently failed: 11
| |- Total failed: 2962
| `- File list: /var/log/nginx/access.log
`- Actions
|- Currently banned: 88
|- Total banned: 88
`- Banned IP list: 176.59.129.174 176.59.129.44 176.59.130.124 176.59.132.106 176.59.133.195 176.59.134.14 176.59.142.78 176.59.146.203 176.59.151.46 176.59.193.194 176.59.194.205 176.59.200.101 176.59.200.92 176.59.201.16 176.59.201.174 176.59.32.58 176.59.32.99 176.59.33.4 176.59.33.43 176.59.33.86 176.59.34.97 176.59.38.189 176.59.39.47 176.59.43.227 176.59.46.102 176.59.46.210 176.59.49.240 176.59.52.215 176.59.68.151 176.99.82.18 178.176.48.132 178.67.194.209 178.67.196.94 188.113.141.148 213.234.251.192 213.27.48.88 213.87.250.113 217.118.64.2 217.118.93.139 31.13.144.102 31.173.241.11 31.173.80.23 37.29.40.213 37.29.41.108 37.29.41.208 46.187.12.73 46.45.200.129 62.133.162.154 80.83.237.30 80.83.237.34 83.149.21.218 83.234.120.247 85.115.243.47 85.115.248.16 85.115.248.250 85.140.0.111 85.140.0.159 85.140.0.9 85.140.1.20 85.140.1.225 85.140.12.183 85.140.19.132 85.140.2.127 85.140.4.36 85.140.4.92 85.174.194.255 85.174.198.90 85.249.163.166 85.249.25.218 85.26.164.108 85.26.164.151 85.26.165.234 85.26.165.238 85.26.232.91 85.26.233.73 85.26.235.207 89.113.138.149 89.113.138.255 89.113.139.227 89.113.140.202 89.178.132.99 93.88.25.3 95.153.129.19 95.153.129.237 109.197.205.118 85.115.248.36 176.59.140.152 176.59.68.199
Y la salida de iptables -L -n -v es:
Chain INPUT (policy ACCEPT 419 packets, 175K bytes)
pkts bytes target prot opt in out source destination
23438 6327K f2b-nginx-custom2 all -- * * 0.0.0.0/0 0.0.0.0/0
22460 6268K f2b-nginx-botsearch all -- * * 0.0.0.0/0 0.0.0.0/0
22460 6268K f2b-sshd all -- * * 0.0.0.0/0 0.0.0.0/0
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 412 packets, 60919 bytes)
pkts bytes target prot opt in out source destination
Chain f2b-nginx-botsearch (1 references)
pkts bytes target prot opt in out source destination
0 0 REJECT all -- * * 87.26.121.231 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 8.129.209.71 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 47.98.190.243 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 171.244.49.242 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 157.131.240.194 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 149.129.137.131 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 128.106.166.8 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 103.76.228.45 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 103.44.245.166 0.0.0.0/0 reject-with icmp-port-unreachable
22460 6268K RETURN all -- * * 0.0.0.0/0 0.0.0.0/0
Chain f2b-nginx-custom2 (1 references)
pkts bytes target prot opt in out source destination
117 7020 REJECT all -- * * 176.59.68.199 0.0.0.0/0 reject-with icmp-port-unreachable
58 3480 REJECT all -- * * 176.59.140.152 0.0.0.0/0 reject-with icmp-port-unreachable
72 4320 REJECT all -- * * 85.115.248.36 0.0.0.0/0 reject-with icmp-port-unreachable
7 420 REJECT all -- * * 109.197.205.118 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 95.153.129.237 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 95.153.129.19 0.0.0.0/0 reject-with icmp-port-unreachable
23 1380 REJECT all -- * * 93.88.25.3 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 89.178.132.99 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 89.113.140.202 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 89.113.139.227 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 89.113.138.255 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 89.113.138.149 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.26.235.207 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.26.233.73 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.26.232.91 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.26.165.238 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.26.165.234 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.26.164.151 0.0.0.0/0 reject-with icmp-port-unreachable
17 1020 REJECT all -- * * 85.26.164.108 0.0.0.0/0 reject-with icmp-port-unreachable
32 1920 REJECT all -- * * 85.249.25.218 0.0.0.0/0 reject-with icmp-port-unreachable
189 11340 REJECT all -- * * 85.249.163.166 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.174.198.90 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.174.194.255 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.140.4.92 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.140.4.36 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.140.2.127 0.0.0.0/0 reject-with icmp-port-unreachable
15 900 REJECT all -- * * 85.140.19.132 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.140.12.183 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.140.1.225 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.140.1.20 0.0.0.0/0 reject-with icmp-port-unreachable
40 2400 REJECT all -- * * 85.140.0.9 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.140.0.159 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.140.0.111 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.115.248.250 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.115.248.16 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 85.115.243.47 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 83.234.120.247 0.0.0.0/0 reject-with icmp-port-unreachable
66 3960 REJECT all -- * * 83.149.21.218 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 80.83.237.34 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 80.83.237.30 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 62.133.162.154 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 46.45.200.129 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 46.187.12.73 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 37.29.41.208 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 37.29.41.108 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 37.29.40.213 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 31.173.80.23 0.0.0.0/0 reject-with icmp-port-unreachable
12 720 REJECT all -- * * 31.173.241.11 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 31.13.144.102 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 217.118.93.139 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 217.118.64.2 0.0.0.0/0 reject-with icmp-port-unreachable
7 420 REJECT all -- * * 213.87.250.113 0.0.0.0/0 reject-with icmp-port-unreachable
4 240 REJECT all -- * * 213.27.48.88 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 213.234.251.192 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 188.113.141.148 0.0.0.0/0 reject-with icmp-port-unreachable
210 12600 REJECT all -- * * 178.67.196.94 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 178.67.194.209 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 178.176.48.132 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.99.82.18 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.68.151 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.52.215 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.49.240 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.46.210 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.46.102 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.43.227 0.0.0.0/0 reject-with icmp-port-unreachable
7 420 REJECT all -- * * 176.59.39.47 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.38.189 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.34.97 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.33.86 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.33.43 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.33.4 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.32.99 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.32.58 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.201.174 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.201.16 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.200.92 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.200.101 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.194.205 0.0.0.0/0 reject-with icmp-port-unreachable
102 6120 REJECT all -- * * 176.59.193.194 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.151.46 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.146.203 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.142.78 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.134.14 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.133.195 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.132.106 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.130.124 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.129.44 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 176.59.129.174 0.0.0.0/0 reject-with icmp-port-unreachable
22460 6268K RETURN all -- * * 0.0.0.0/0 0.0.0.0/0
Chain f2b-sshd (1 references)
pkts bytes target prot opt in out source destination
9 724 REJECT all -- * * 110.16.95.6 0.0.0.0/0 reject-with icmp-port-unreachable
18 1384 REJECT all -- * * 113.190.235.28 0.0.0.0/0 reject-with icmp-port-unreachable
45 3192 REJECT all -- * * 94.191.38.203 0.0.0.0/0 reject-with icmp-port-unreachable
20 1556 REJECT all -- * * 14.232.214.138 0.0.0.0/0 reject-with icmp-port-unreachable
18 1424 REJECT all -- * * 222.252.30.29 0.0.0.0/0 reject-with icmp-port-unreachable
31 2268 REJECT all -- * * 146.59.157.181 0.0.0.0/0 reject-with icmp-port-unreachable
11 660 REJECT all -- * * 110.35.79.23 0.0.0.0/0 reject-with icmp-port-unreachable
20 1512 REJECT all -- * * 190.202.32.2 0.0.0.0/0 reject-with icmp-port-unreachable
23 1732 REJECT all -- * * 190.79.227.81 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 103.127.108.96 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 103.123.246.130 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 101.36.110.215 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 101.109.245.158 0.0.0.0/0 reject-with icmp-port-unreachable
0 0 REJECT all -- * * 1.245.61.144 0.0.0.0/0 reject-with icmp-port-unreachable
21387 6197K RETURN all -- * * 0.0.0.0/0 0.0.0.0/0
Chain ispmgr_allow_ip (0 references)
pkts bytes target prot opt in out source destination
Chain ispmgr_allow_sub (0 references)
pkts bytes target prot opt in out source destination
Chain ispmgr_deny_ip (0 references)
pkts bytes target prot opt in out source destination
Chain ispmgr_deny_sub (0 references)
pkts bytes target prot opt in out source destination
Chain ufw-after-forward (0 references)
pkts bytes target prot opt in out source destination
Chain ufw-after-input (0 references)
pkts bytes target prot opt in out source destination
Chain ufw-after-logging-forward (0 references)
pkts bytes target prot opt in out source destination
Chain ufw-after-logging-input (0 references)
pkts bytes target prot opt in out source destination
Chain ufw-after-logging-output (0 references)
pkts bytes target prot opt in out source destination
Chain ufw-after-output (0 references)
pkts bytes target prot opt in out source destination
Chain ufw-before-forward (0 references)
pkts bytes target prot opt in out source destination
Chain ufw-before-input (0 references)
pkts bytes target prot opt in out source destination
Chain ufw-before-logging-forward (0 references)
pkts bytes target prot opt in out source destination
Chain ufw-before-logging-input (0 references)
pkts bytes target prot opt in out source destination
Chain ufw-before-logging-output (0 references)
pkts bytes target prot opt in out source destination
Chain ufw-before-output (0 references)
pkts bytes target prot opt in out source destination
Chain ufw-reject-forward (0 references)
pkts bytes target prot opt in out source destination
Chain ufw-reject-input (0 references)
pkts bytes target prot opt in out source destination
Chain ufw-reject-output (0 references)
pkts bytes target prot opt in out source destination
Chain ufw-track-forward (0 references)
pkts bytes target prot opt in out source destination
Chain ufw-track-input (0 references)
pkts bytes target prot opt in out source destination
Chain ufw-track-output (0 references)
pkts bytes target prot opt in out source destination
PERO, todavía recibo registros en mi /var/log/nginx/access.log de IP que ya están prohibidas. También obtengo muchos registros en mi /var/log/fail2ban.log que se ven así:
2020-12-15 08:23:38,156 fail2ban.actions [2803]: WARNING [nginx-custom2] 83.149.21.218 already banned
Por favor ayúdenme a entender a dónde ir desde aquí.
Respuesta1
Veo ufwcadenas en tu iptablessalida. ¿Podría ser que el backend de filtro de red que ufwutiliza sea un nftables? Si no recuerdo mal, el cambio de backend está planeado para Ubuntu en 20.10, pero tal vez usted mismo lo cambió o algún servicio instalado (en este caso, será mejor que cambie a la acción de prohibición de nftables).
Aunque no sería demasiado falso usar un filtro de red de bajo nivel, pero si usa ufw, ¿qué habla en contra del uso de la acción de prohibición de ufw en fail2ban?
Y parece que todavía hay un ispmanager...
De todos modos, veo todas las cadenas ( ispmgr_*y ufw-*) en iptables pero no hay referencias a ellas. Entonces, o está configurado de manera extraña o hay algún problema con el subsistema de firewall de este sistema.
¿Es una máquina virtual? (En caso afirmativo, ¿cuál?)...
¿Se utiliza (permite) el módulo kernel de iptables en su sistema?
¿Y cuál es exactamente tu backend de ufw?