Fail2Ban (Linux): Unterschied zwischen den Versionen
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Zeile 92: | Zeile 92: | ||
[DEFAULT] | [DEFAULT] | ||
# Destination email for action that send you an email | # Destination email for action that send you an email | ||
destemail = | destemail = admin@<domain> | ||
# Sender email. Warning: not all actions take this into account. Make sure to test if you rely on this | # Sender email. Warning: not all actions take this into account. Make sure to test if you rely on this | ||
sender = | sender = admin@<domain> | ||
# Default action. Will block user and send you an email with whois content and log lines. | # Default action. Will block user and send you an email with whois content and log lines. | ||
Zeile 103: | Zeile 103: | ||
banaction = nftables-multiport | banaction = nftables-multiport | ||
chain = input | chain = input | ||
</pre> | </pre> | ||
Version vom 31. März 2020, 16:56 Uhr
Noch in Bearbeitung
Installation
iptables-
verhindert das iptables mitinstalliert wird.
sudo apt-get install fail2ban iptables-
Konfiguration
/etc/nftables/fail2ban.conf
Das Verzeichnis /etc/nftables/ existiert nicht und muss erst angelegt werden:
sudo mkdir /etc/nftables/
Danach die Datei
sudo vi /etc/nftables/fail2ban.conf
erstellen und mit folgendem Inhalt befüllen:
#!/usr/sbin/nft -f # Use ip as fail2ban doesn't support ipv6 yet table ip fail2ban { chain input { # Assign a high priority to reject as fast as possible and avoid more complex rule evaluation type filter hook input priority 100; } }
Die zuvor erstellte Datei in
sudo vi /etc/nftables.conf
direkt nach flush ruleset
inkludieren:
#!/usr/sbin/nft -f flush ruleset include "/etc/nftables/fail2ban.conf" ...
Damit die neue Tabelle aktiv wird, muss die Konfiguration nochmals neu geladen werden:
sudo systemctl reload nftables.service
/etc/fail2ban/action.d/nftables-common.local
sudo vi /etc/fail2ban/action.d/nftables-common.local
[Init] # Definition of the table used nftables_family = ip nftables_table = fail2ban # Drop packets blocktype = drop # Remove nftables prefix. Set names are limited to 15 char so we want them all nftables_set_prefix =
/etc/fail2ban/jail.local
sudo vi /etc/fail2ban/jail.local
[DEFAULT] # Destination email for action that send you an email destemail = admin@<domain> # Sender email. Warning: not all actions take this into account. Make sure to test if you rely on this sender = admin@<domain> # Default action. Will block user and send you an email with whois content and log lines. action = %(action_mwl)s # configure nftables banaction = nftables-multiport chain = input
Links
https://wiki.meurisse.org/wiki/Fail2Ban
https://wiki.ubuntuusers.de/fail2ban/
https://peters-christoph.de/blog/server/sicherheit-mit-fail2ban-erhoehen-postfix-ssh/
https://www.thomas-krenn.com/de/wiki/SSH_Login_unter_Debian_mit_fail2ban_absichern
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