Linux sicherheit: Unterschied zwischen den Versionen
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| (9 dazwischenliegende Versionen desselben Benutzers werden nicht angezeigt) | |||
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= allgemein = | |||
* https://vosp.info/index.php/Ssh#sshd | |||
= Live Überwachen = | |||
<source lang=bash> | |||
# htop - bessere form von top | |||
htop | |||
# uptime - wie lange der rechner online ist und wieviele cpu kerne seit 1m/5m/15m durchschnittlich genutzt wurden | |||
uptime | |||
# letzte neustarts | |||
last reboot | |||
</source> | |||
=Programme= | |||
* chkrootkit - Linux rootkit scanner | * chkrootkit - Linux rootkit scanner | ||
* Lynis - Universal security auditing tool and rootkit scanner | * Lynis - Universal security auditing tool and rootkit scanner | ||
| Zeile 16: | Zeile 31: | ||
* https://www.howtoforge.com/tutorial/how-to-scan-linux-for-malware-and-rootkits/ | * https://www.howtoforge.com/tutorial/how-to-scan-linux-for-malware-and-rootkits/ | ||
* https://www.howtoforge.com/faq/how-to-scan-linux-for-malware | * https://www.howtoforge.com/faq/how-to-scan-linux-for-malware | ||
= fail2ban= | |||
== installation / konfiguration == | |||
den server absichern gegen DoS Angriffe | |||
<source lang=bash> | |||
apt install fail2ban | |||
sudo cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local | |||
</source> | |||
* wichtig sind die einträge zu verändern, z.B. | |||
<source lang=bash> | |||
# "bantime" is the number of seconds that a host is banned. | |||
bantime = 30m | |||
# A host is banned if it has generated "maxretry" during the last "findtime" | |||
# seconds. | |||
findtime = 20m | |||
# "maxretry" is the number of failures before a host get banned. | |||
maxretry = 2 | |||
</source> | |||
* Befehle | |||
<source lang=bash> | |||
systemctl restart fail2ban.service | |||
fail2ban-client status sshd | |||
tail -f /var/log/fail2ban.log | |||
</source> | |||
* https://www.thomas-krenn.com/de/wiki/SSH_Login_unter_Debian_mit_fail2ban_absichern | |||
* https://wiki.ubuntuusers.de/fail2ban/ | |||
== gebannte == | |||
* https://www.fail2ban.org/wiki/index.php/Whitelist | |||
=== zeige gebannte === | |||
<source lang=bash> | |||
zgrep 'Ban' /var/log/fail2ban.log* | |||
</source> | |||
=== unban === | |||
<source lang=bash> | |||
#fail2ban-client set YOURJAILNAMEHERE unbanip IPADDRESSHERE | |||
fail2ban-client set sshd unbanip 8.1.8.1 | |||
</source> | |||
Aktuelle Version vom 11. Januar 2025, 11:03 Uhr
allgemein
Live Überwachen
# htop - bessere form von top
htop
# uptime - wie lange der rechner online ist und wieviele cpu kerne seit 1m/5m/15m durchschnittlich genutzt wurden
uptime
# letzte neustarts
last reboot
Programme
- chkrootkit - Linux rootkit scanner
- Lynis - Universal security auditing tool and rootkit scanner
lynis update info
lynis audit system
- rkhunter
rkhunter --update
rkhunter -c
Quellen
- https://www.howtoforge.com/tutorial/how-to-scan-linux-for-malware-and-rootkits/
- https://www.howtoforge.com/faq/how-to-scan-linux-for-malware
fail2ban
installation / konfiguration
den server absichern gegen DoS Angriffe
apt install fail2ban
sudo cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local
- wichtig sind die einträge zu verändern, z.B.
# "bantime" is the number of seconds that a host is banned.
bantime = 30m
# A host is banned if it has generated "maxretry" during the last "findtime"
# seconds.
findtime = 20m
# "maxretry" is the number of failures before a host get banned.
maxretry = 2
- Befehle
systemctl restart fail2ban.service
fail2ban-client status sshd
tail -f /var/log/fail2ban.log
- https://www.thomas-krenn.com/de/wiki/SSH_Login_unter_Debian_mit_fail2ban_absichern
- https://wiki.ubuntuusers.de/fail2ban/
gebannte
zeige gebannte
zgrep 'Ban' /var/log/fail2ban.log*
unban
#fail2ban-client set YOURJAILNAMEHERE unbanip IPADDRESSHERE
fail2ban-client set sshd unbanip 8.1.8.1