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Skript kiddies und SSH

Anzahl an fehlerhaften Logins ausgeben:

cat /var/logauth.log | grep invalid | wc -l

Für einen Server, der in halbes Jahr im Netz läuft finde ich 68350 Versuche.

Ein Auszug von /var/logauth.log
Jun 3 00:12:02 uhweb69144 sshd[11470]: Invalid user hilary from
201.147.235.91
Jun 3 00:12:02 uhweb69144 sshd[11470]: reverse mapping checking
getaddrinfo for static.customer-201-147-235-91.uninet-ide.com.mx failed
- POSSIBLE BREAK-IN ATTEMPT!
Jun 3 00:12:02 uhweb69144 sshd[11470]: (pam_unix) check pass; user unknown
Jun 3 00:12:02 uhweb69144 sshd[11470]: (pam_unix) authentication
failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=201.147.235.91
Jun 3 00:12:04 uhweb69144 sshd[11470]: Failed password for invalid user
hilary from 201.147.235.91 port 49507 ssh2
Jun 3 00:12:09 uhweb69144 sshd[11530]: Invalid user howard from
201.147.235.91
Jun 3 00:12:09 uhweb69144 sshd[11530]: reverse mapping checking
getaddrinfo for static.customer-201-147-235-91.uninet-ide.com.mx failed
- POSSIBLE BREAK-IN ATTEMPT!
Jun 3 00:12:09 uhweb69144 sshd[11530]: (pam_unix) check pass; user unknown
Jun 3 00:12:09 uhweb69144 sshd[11530]: (pam_unix) authentication
failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=201.147.235.91
Jun 3 00:12:11 uhweb69144 sshd[11530]: Failed password for invalid user
howard from 201.147.235.91 port 49717 ssh2
Jun 3 00:12:13 uhweb69144 sshd[11544]: Invalid user irene from
201.147.235.91
Jun 3 00:12:13 uhweb69144 sshd[11544]: reverse mapping checking
getaddrinfo for static.customer-201-147-235-91.uninet-ide.com.mx failed
- POSSIBLE BREAK-IN ATTEMPT!
Jun 3 00:12:13 uhweb69144 sshd[11544]: (pam_unix) check pass; user unknown
Jun 3 00:12:13 uhweb69144 sshd[11544]: (pam_unix) authentication
failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=201.147.235.91
Jun 3 00:12:15 uhweb69144 sshd[11544]: Failed password for invalid user
irene from 201.147.235.91 port 49891 ssh2
Jun 3 00:12:17 uhweb69144 sshd[11556]: Invalid user isaac from
201.147.235.91
Jun 3 00:12:17 uhweb69144 sshd[11556]: reverse mapping checking
getaddrinfo for static.customer-201-147-235-91.uninet-ide.com.mx failed
- POSSIBLE BREAK-IN ATTEMPT!
Jun 3 00:12:17 uhweb69144 sshd[11556]: (pam_unix) check pass; user unknown
Jun 3 00:12:17 uhweb69144 sshd[11556]: (pam_unix) authentication
failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=201.147.235.91
Jun 3 00:12:19 uhweb69144 sshd[11556]: Failed password for invalid user
isaac from 201.147.235.91 port 49989 ssh2
Jun 3 00:12:21 uhweb69144 sshd[11574]: Invalid user isabel from
201.147.235.91
Jun 3 00:12:21 uhweb69144 sshd[11574]: reverse mapping checking
getaddrinfo for static.customer-201-147-235-91.uninet-ide.com.mx failed
- POSSIBLE BREAK-IN ATTEMPT!
Jun 3 00:12:21 uhweb69144 sshd[11574]: (pam_unix) check pass; user unknown
Jun 3 00:12:21 uhweb69144 sshd[11574]: (pam_unix) authentication
failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=201.147.235.91
Jun 3 00:12:23 uhweb69144 sshd[11574]: Failed password for invalid user
isabel from 201.147.235.91 port 50115 ssh2
Jun 3 00:12:25 uhweb69144 sshd[11592]: Invalid user isabella from
201.147.235.91
Jun 3 00:12:25 uhweb69144 sshd[11592]: reverse mapping checking
getaddrinfo for static.customer-201-147-235-91.uninet-ide.com.mx failed
- POSSIBLE BREAK-IN ATTEMPT!
Jun 3 00:12:25 uhweb69144 sshd[11592]: (pam_unix) check pass; user unknown
Jun 3 00:12:25 uhweb69144 sshd[11592]: (pam_unix) authentication
failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=201.147.235.91
Jun 3 00:12:26 uhweb69144 sshd[11592]: Failed password for invalid user
isabella from 201.147.235.91 port 50234 ssh2
Jun 3 00:12:28 uhweb69144 sshd[11611]: Invalid user jack from
201.147.235.91
Jun 3 00:12:28 uhweb69144 sshd[11611]: reverse mapping checking
getaddrinfo for static.customer-201-147-235-91.uninet-ide.com.mx failed
- POSSIBLE BREAK-IN ATTEMPT!
Jun 3 00:12:28 uhweb69144 sshd[11611]: (pam_unix) check pass; user unknown
Jun 3 00:12:28 uhweb69144 sshd[11611]: (pam_unix) authentication
failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=201.147.235.91
Jun 3 00:12:30 uhweb69144 sshd[11611]: Failed password for invalid user
jack from 201.147.235.91 port 50336 ssh2
Jun 3 00:12:32 uhweb69144 sshd[11627]: Invalid user jacob from
201.147.235.91
Jun 3 00:12:32 uhweb69144 sshd[11627]: reverse mapping checking
getaddrinfo for static.customer-201-147-235-91.uninet-ide.com.mx failed
- POSSIBLE BREAK-IN ATTEMPT!
Jun 3 00:12:32 uhweb69144 sshd[11627]: (pam_unix) check pass; user unknown


Paket zum Bannen von den Bösen:
fail2ban

Befehle:
faillog

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