Fail2ban für Nextcloud

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apt update && apt install fail2ban -y

Filter erstellen

vi /etc/fail2ban/filter.d/nextcloud.conf
[Definition]
failregex=^{"reqId":".*","remoteAddr":".*","app":"core","message":"Login failed: '.*' \(Remote IP: '<HOST>'\)","level":2,"time":".*"}$
            ^{"reqId":".*","level":2,"time":".*","remoteAddr":".*","app":"core".*","message":"Login failed: '.*' \(Remote IP: '<HOST>'\)".*}$
            ^.*\"remoteAddr\":\"<HOST>\".*Trusted domain error.*$

Jail erstellen

Für jede Nextcloud-Instanz einen eigenen Jail erstellen und logpath anpassen.

vi /etc/fail2ban/jail.d/nextcloud.domain.xx.local
[nextcloud.domain.xx]
# gleichnamige Datei in /etc/fail2ban/filter.d
filter = nextcloud

# Zeit in Sekunden
# -1 für permanentes Sperren
bantime = 3600

findtime = 3600
maxretry = 3
backend = auto
enabled = true
port = 80,443
protocol = tcp
logpath = /var/nextcloud-data/nextcloud.domain.xx/nextcloud.log

# Fail2ban-Admin per E-Mail benachrichtigen
#action = %(action_mwl)s

# Enablen für ngix
#[nginx-http-auth]
#enabled = true

Fail2ban neu starten

service fail2ban restart

Test

fail2ban-regex /var/nextcloud-data/nextcloud.domain.xx/nextcloud.log /etc/fail2ban/filter.d/nextcloud.conf
Running tests
=============

Use   failregex filter file : nextcloud, basedir: /etc/fail2ban
Use         log file : fail2ban-regex /var/nextcloud-data/nextcloud.domain.xx/nextcloud.log
Use         encoding : UTF-8


Results
=======

Failregex: 73 total
|-  #) [# of hits] regular expression
|   2) [73] ^{"reqId":".*","level":2,"time":".*","remoteAddr":".*","app":"core".*","message":"Login failed: '.*' \(Remote IP: '<HOST>'\)".*}$
`-

Ignoreregex: 0 total

Date template hits:
|- [# of hits] date format
|  [904] ExYear(?P<_sep>[-/.])Month(?P=_sep)Day(?:T|  ?)24hour:Minute:Second(?:[.,]Microseconds)?(?:\s*Zone offset)?
`-


Lines: 904 lines, 0 ignored, 73 matched, 831 missed
[processed in 0.34 sec]

Missed line(s): too many to print.  Use --print-all-missed to print all 831 lines

Status

fail2ban-client status nextcloud.domain.xx

Unban

fail2ban-client set nextcloud.domain.xx unbanip <IP>

Siehe auch