BreadCrumbs: Fail2ban
Fail2ban
From Luke Jackson
(Difference between revisions)
| Revision as of 05:04, 18 November 2020 (edit) Ljackson (Talk | contribs) (→Filter and visualize 7 columns on space-padded single digit day-of-month (SDDOM) log files) ← Previous diff |
Current revision (05:16, 18 November 2020) (edit) Ljackson (Talk | contribs) (→Extract Frequent Bans from Messages/Fail2ban.log) |
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| Sep 18 00:55:38 core fail2ban.actions: WARNING [sasl-iptables] Ban 212.70.149.4 | Sep 18 00:55:38 core fail2ban.actions: WARNING [sasl-iptables] Ban 212.70.149.4 | ||
| </pre> | </pre> | ||
| + | |||
| + | === Extract >6 count offender IP addresses and generate iptables rules to file === | ||
| + | |||
| + | cat /var/log/messages* | grep Ban | cut -d']' -f 2- | cut -d' ' -f 3 | sort | uniq -c | sort -rn | awk -F' ' '{if($1>6)print$2}' | xargs -IX echo '-A INPUT -s X -j DROP -m comment --comment "Fail2ban PermaBan!!"' > ips.txt | ||
| Generate iptables rules (copy/paste IP addresses based on sorted list) [Mac OSX] | Generate iptables rules (copy/paste IP addresses based on sorted list) [Mac OSX] | ||
Current revision
[edit]
Filter full text rows on space-padded single digit day-of-month (SDDOM) log files
Zero-padded for last 3 days, sort results by text and filter through more
awk '{$2 = sprintf("%02d", $2); print}' secure* | awk -F'[: ]' 'BEGIN{ mths=" JanFebMarAprMayJunJulAugSepOctNovDec"; tt=systime()-(60*60*24*10) } mktime(strftime("%Y")" "index(mths,$1)/3" "$2" "$3" "$4" "$5) >= tt {print $0}' | sort | more
[edit]
Filter and visualize 7 columns on space-padded single digit day-of-month (SDDOM) log files
Zero-padded for last 3 days, sort results by text and filter through more
awk '{$2 = sprintf("%02d", $2); print}' secure* | awk -F'[: ]' 'BEGIN{ mths=" JanFebMarAprMayJunJulAugSepOctNovDec"; tt=systime()-(60*60*24*3) } mktime(strftime("%Y")" "index(mths,$1)/3" "$2" "$3" "$4" "$5) >= tt {for (i=1; i<8; i++) printf $i"\t"; if (i = NF) print "Cols:"NF;}' | sort | more
[edit]
Extract Frequent Bans from Messages/Fail2ban.log
Extract frequent offender IP addresses
cat /var/log/messages | grep Ban | cut -d']' -f 2- | cut -d' ' -f 3 | sort | uniq -c | sort -n | cut -c 9-
Logfile excerpt:
Sep 17 23:42:40 core fail2ban.actions: WARNING [sasl-iptables] Ban 212.70.149.20 Sep 17 23:43:38 core fail2ban.actions: WARNING [sasl-iptables] Ban 45.142.120.83 Sep 17 23:44:14 core fail2ban.actions: WARNING [sasl-iptables] Ban 212.70.149.83 Sep 17 23:45:40 core fail2ban.actions: WARNING [sasl-iptables] Ban 212.70.149.52 Sep 18 00:02:05 core fail2ban.actions: WARNING [ssh-iptables] Ban 64.235.45.41 Sep 18 00:22:15 core fail2ban.actions: WARNING [sasl-iptables] Ban 193.169.253.168 Sep 18 00:39:59 core fail2ban.actions: WARNING [sasl-iptables] Ban 78.128.113.120 Sep 18 00:55:38 core fail2ban.actions: WARNING [sasl-iptables] Ban 212.70.149.4
[edit]
Extract >6 count offender IP addresses and generate iptables rules to file
cat /var/log/messages* | grep Ban | cut -d']' -f 2- | cut -d' ' -f 3 | sort | uniq -c | sort -rn | awk -F' ' '{if($1>6)print$2}' | xargs -IX echo '-A INPUT -s X -j DROP -m comment --comment "Fail2ban PermaBan!!"' > ips.txt
Generate iptables rules (copy/paste IP addresses based on sorted list) [Mac OSX]
for i in `pbpaste`; do echo '-A INPUT -s '$i' -j DROP -m comment --comment "Fail2ban PermaBan!!"'; done
[edit]
Service Names and Port Numbers
Lookup via /etc/services
cat /etc/services | grep -E ' (25|465|110|995|143|993)\/'
Service Name Data Table
# service-name port/protocol [aliases ...] [# comment] smtp 25/tcp mail smtp 25/udp mail pop3 110/tcp pop-3 # POP version 3 pop3 110/udp pop-3 imap 143/tcp imap2 # Interim Mail Access Proto v2 imap 143/udp imap2 imaps 993/tcp # IMAP over SSL imaps 993/udp # IMAP over SSL pop3s 995/tcp # POP-3 over SSL pop3s 995/udp # POP-3 over SSL urd 465/tcp smtps # URL Rendesvous Directory for SSM / SMTP over SSL (TLS) igmpv3lite 465/udp # IGMP over UDP for SSM