Linux sicherheit: Unterschied zwischen den Versionen
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F (Diskussion | Beiträge) |
F (Diskussion | Beiträge) (→fail2ban) |
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| (8 dazwischenliegende Versionen desselben Benutzers werden nicht angezeigt) | |||
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| + | = allgemein = | ||
| + | |||
| + | * https://vosp.netz.coop/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 28. März 2022, 10:29 Uhr
Inhaltsverzeichnis
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
