Na moim serwerze port ssh nie jest standardem 22. Ustawiłem inny. Jeśli skonfiguruję fail2ban, czy będzie w stanie wykryć ten port? Jak mogę nakazać sprawdzenie tego portu zamiast portu 22?
Dane wyjściowe iptables -L -v -n:
Chain fail2ban-ssh (1 references)
pkts bytes target prot opt in out source destination
0 0 DROP all -- * * 119.235.2.158 0.0.0.0/0
0 0 RETURN all -- * * 0.0.0.0/0 0.0.0.0/0
Chain fail2ban-ssh-ddos (0 references)
pkts bytes target prot opt in out source destination
Stan wyjściowy usługi iptables:
iptables: unrecognized service
Podsumowanie fail2ban-regex /var/log/auth.log /etc/fail2ban/filter.d/sshd.conf:
Summary
=======
Addresses found:
[1]
[2]
[3]
113.59.222.240 (Wed Mar 21 18:24:47 2012)
113.59.222.240 (Wed Mar 21 18:24:52 2012)
119.235.14.153 (Wed Mar 21 21:52:53 2012)
113.59.222.21 (Thu Mar 22 07:50:44 2012)
176.9.57.203 (Fri Mar 23 19:34:29 2012)
176.9.57.203 (Fri Mar 23 19:34:42 2012)
113.59.222.56 (Sat Mar 31 14:23:52 2012)
113.59.222.56 (Sat Mar 31 14:24:05 2012)
119.235.14.183 (Mon Apr 02 20:49:13 2012)
119.235.14.168 (Sat Apr 21 09:58:56 2012)
119.235.2.158 (Wed Apr 25 13:11:03 2012)
119.235.2.158 (Wed Apr 25 13:11:40 2012)
119.235.2.158 (Wed Apr 25 13:11:43 2012)
119.235.2.158 (Wed Apr 25 13:11:47 2012)
119.235.2.158 (Wed Apr 25 13:12:49 2012)
119.235.2.158 (Wed Apr 25 13:12:52 2012)
119.235.2.158 (Wed Apr 25 13:12:55 2012)
119.235.2.158 (Wed Apr 25 13:12:58 2012)
119.235.2.158 (Wed Apr 25 13:13:02 2012)
119.235.2.158 (Wed Apr 25 13:13:04 2012)
119.235.2.158 (Wed Apr 25 13:13:25 2012)
119.235.2.158 (Wed Apr 25 13:19:18 2012)
119.235.2.158 (Wed Apr 25 13:19:52 2012)
119.235.2.158 (Wed Apr 25 13:19:55 2012)
119.235.2.158 (Wed Apr 25 13:19:55 2012)
119.235.2.158 (Wed Apr 25 13:19:58 2012)
119.235.2.158 (Wed Apr 25 13:20:02 2012)
119.235.2.158 (Wed Apr 25 13:20:05 2012)
119.235.2.158 (Wed Apr 25 13:40:16 2012)
[4]
[5]
119.235.2.158 (Wed Apr 25 13:11:38 2012)
119.235.2.158 (Wed Apr 25 13:12:46 2012)
119.235.2.158 (Wed Apr 25 13:19:49 2012)
[6]
119.235.2.155 (Wed Mar 21 13:13:30 2012)
113.59.222.240 (Wed Mar 21 18:24:43 2012)
119.235.14.153 (Wed Mar 21 21:52:51 2012)
176.9.57.203 (Fri Mar 23 19:34:26 2012)
119.235.2.158 (Wed Apr 25 13:19:15 2012)
[7]
[8]
[9]
[10]
Date template hits:
1169837 hit(s): MONTH Day Hour:Minute:Second
0 hit(s): WEEKDAY MONTH Day Hour:Minute:Second Year
0 hit(s): WEEKDAY MONTH Day Hour:Minute:Second
0 hit(s): Year/Month/Day Hour:Minute:Second
0 hit(s): Day/Month/Year Hour:Minute:Second
0 hit(s): Day/Month/Year Hour:Minute:Second
0 hit(s): Day/MONTH/Year:Hour:Minute:Second
0 hit(s): Month/Day/Year:Hour:Minute:Second
0 hit(s): Year-Month-Day Hour:Minute:Second
0 hit(s): Day-MONTH-Year Hour:Minute:Second[.Millisecond]
0 hit(s): Day-Month-Year Hour:Minute:Second
0 hit(s): TAI64N
0 hit(s): Epoch
0 hit(s): ISO 8601
0 hit(s): Hour:Minute:Second
0 hit(s): <Month/Day/Year@Hour:Minute:Second>
Success, the total number of match is 37
However, look at the above section 'Running tests' which could contain important
information.
jail.conf:
# Fail2Ban configuration file.
#
# This file was composed for Debian systems from the original one
# provided now under /usr/share/doc/fail2ban/examples/jail.conf
# for additional examples.
#
# To avoid merges during upgrades DO NOT MODIFY THIS FILE
# and rather provide your changes in /etc/fail2ban/jail.local
#
# Author: Yaroslav O. Halchenko <[email protected]>
#
# $Revision: 281 $
#
# The DEFAULT allows a global definition of the options. They can be override
# in each jail afterwards.
[DEFAULT]
# "ignoreip" can be an IP address, a CIDR mask or a DNS host
ignoreip = 127.0.0.1
bantime = 14400
maxretry = 3
# "backend" specifies the backend used to get files modification. Available
# options are "gamin", "polling" and "auto".
# yoh: For some reason Debian shipped python-gamin didn't work as expected
# This issue left ToDo, so polling is default backend for now
backend = polling
#
# Destination email address used solely for the interpolations in
# jail.{conf,local} configuration files.
destemail = root@localhost
#
# ACTIONS
#
# Default banning action (e.g. iptables, iptables-new,
# iptables-multiport, shorewall, etc) It is used to define
# action_* variables. Can be overriden globally or per
# section within jail.local file
banaction = iptables-multiport
# email action. Since 0.8.1 upstream fail2ban uses sendmail
# MTA for the mailing. Change mta configuration parameter to mail
# if you want to revert to conventional 'mail'.
mta = sendmail
# Default protocol
protocol = tcp
#
# Action shortcuts. To be used to define action parameter
# The simplest action to take: ban only
action_ = %(banaction)s[name=%(__name__)s, port="%(port)s", protocol="%(protocol)s]
# ban & send an e-mail with whois report to the destemail.
action_mw = %(banaction)s[name=%(__name__)s, port="%(port)s", protocol="%(protocol)s]
%(mta)s-whois[name=%(__name__)s, dest="%(destemail)s", protocol="%(protocol)s]
# ban & send an e-mail with whois report and relevant log lines
# to the destemail.
action_mwl = %(banaction)s[name=%(__name__)s, port="%(port)s", protocol="%(protocol)s]
%(mta)s-whois-lines[name=%(__name__)s, dest="%(destemail)s", logpath=%(logpath)s]
# Choose default action. To change, just override value of 'action' with the
# interpolation to the chosen action shortcut (e.g. action_mw, action_mwl, etc) in jail.local
# globally (section [DEFAULT]) or per specific section
action = %(action_)s
#
# JAILS
#
# Next jails corresponds to the standard configuration in Fail2ban 0.6 which
# was shipped in Debian. Enable any defined here jail by including
#
# [SECTION_NAME]
# enabled = true
#
# in /etc/fail2ban/jail.local.
#
# Optionally you may override any other parameter (e.g. banaction,
# action, port, logpath, etc) in that section within jail.local
[ssh]
enabled = true
port = ssh
filter = sshd
logpath = /var/log/auth.log
maxretry = 4
# Generic filter for pam. Has to be used with action which bans all ports
# such as iptables-allports, shorewall
[pam-generic]
enabled = false
# pam-generic filter can be customized to monitor specific subset of 'tty's
filter = pam-generic
# port actually must be irrelevant but lets leave it all for some possible uses
port = all
banaction = iptables-allports
port = anyport
logpath = /var/log/auth.log
maxretry = 6
[xinetd-fail]
enabled = false
filter = xinetd-fail
port = all
banaction = iptables-multiport-log
logpath = /var/log/daemon.log
maxretry = 2
[ssh-ddos]
enabled = true
port = ssh
filter = sshd-ddos
logpath = /var/log/auth.log
maxretry = 6
#
# HTTP servers
#
[apache]
enabled = false
port = http,https
filter = apache-auth
logpath = /var/log/apache*/*error.log
maxretry = 6
# default action is now multiport, so apache-multiport jail was left
# for compatibility with previous (<0.7.6-2) releases
[apache-multiport]
enabled = false
port = http,https
filter = apache-auth
logpath = /var/log/apache*/*error.log
maxretry = 6
[apache-noscript]
enabled = false
port = http,https
filter = apache-noscript
logpath = /var/log/apache*/*error.log
maxretry = 6
[apache-overflows]
enabled = false
port = http,https
filter = apache-overflows
logpath = /var/log/apache*/*error.log
maxretry = 2
[nginx-auth]
enabled = true
filter = nginx-auth
action = iptables-multiport[name=NoAuthFailures, port="http,https"]
logpath = /var/log/nginx*/*error*.log
bantime = 600 # 10 minutes
maxretry = 6
[nginx-login]
enabled = true
filter = nginx-login
action = iptables-multiport[name=NoLoginFailures, port="http,https"]
logpath = /var/log/nginx*/*access*.log
bantime = 600 # 10 minutes
maxretry = 6
[nginx-badbots]
enabled = true
filter = apache-badbots
action = iptables-multiport[name=BadBots, port="http,https"]
logpath = /var/log/nginx*/*access*.log
bantime = 86400 # 1 day
maxretry = 1
[nginx-noscript]
enabled = true
action = iptables-multiport[name=NoScript, port="http,https"]
filter = nginx-noscript
logpath = /var/log/nginx*/*access*.log
maxretry = 6
bantime = 86400 # 1 day
[nginx-proxy]
enabled = true
action = iptables-multiport[name=NoProxy, port="http,https"]
filter = nginx-proxy
logpath = /var/log/nginx*/*access*.log
maxretry = 0
bantime = 86400 # 1 day
#
# FTP servers
#
[vsftpd]
enabled = false
port = ftp,ftp-data,ftps,ftps-data
filter = vsftpd
logpath = /var/log/vsftpd.log
# or overwrite it in jails.local to be
# logpath = /var/log/auth.log
# if you want to rely on PAM failed login attempts
# vsftpd's failregex should match both of those formats
maxretry = 6
[proftpd]
enabled = false
port = ftp,ftp-data,ftps,ftps-data
filter = proftpd
logpath = /var/log/proftpd/proftpd.log
maxretry = 6
[wuftpd]
enabled = false
port = ftp,ftp-data,ftps,ftps-data
filter = wuftpd
logpath = /var/log/auth.log
maxretry = 6
#
# Mail servers
#
[postfix]
enabled = false
port = smtp,ssmtp
filter = postfix
logpath = /var/log/mail.log
[couriersmtp]
enabled = false
port = smtp,ssmtp
filter = couriersmtp
logpath = /var/log/mail.log
#
# Mail servers authenticators: might be used for smtp,ftp,imap servers, so
# all relevant ports get banned
#
[courierauth]
enabled = false
port = smtp,ssmtp,imap2,imap3,imaps,pop3,pop3s
filter = courierlogin
logpath = /var/log/mail.log
[sasl]
enabled = false
port = smtp,ssmtp,imap2,imap3,imaps,pop3,pop3s
filter = sasl
# You might consider monitoring /var/log/warn.log instead
# if you are running postfix. See http://bugs.debian.org/507990
logpath = /var/log/mail.log
# DNS Servers
# These jails block attacks against named (bind9). By default, logging is off
# with bind9 installation. You will need something like this:
#
# logging {
# channel security_file {
# file "/var/log/named/security.log" versions 3 size 30m;
# severity dynamic;
# print-time yes;
# };
# category security {
# security_file;
# };
# };
#
# in your named.conf to provide proper logging
# !!! WARNING !!!
# Since UDP is connectionless protocol, spoofing of IP and immitation
# of illegal actions is way too simple. Thus enabling of this filter
# might provide an easy way for implementing a DoS against a chosen
# victim. See
# http://nion.modprobe.de/blog/archives/690-fail2ban-+-dns-fail.html
# Please DO NOT USE this jail unless you know what you are doing.
#[named-refused-udp]
#
#enabled = false
#port = domain,953
#protocol = udp
#filter = named-refused
#logpath = /var/log/named/security.log
[named-refused-tcp]
enabled = false
port = domain,953
protocol = tcp
filter = named-refused
logpath = /var/log/named/security.log
Właśnie zauważyłem błąd w fail2ban log:
2012-04-25 14: 57: 29 359 fail2ban.actions.action: ERROR iptables -N fail2ban-ssh-ddos
/etc/init.d/iptables statusufw enable?Odpowiedzi:
Fail2Ban używa pliku
/etc/fail2ban/jail.locali poszukaj[ssh]sekcji, możesz tam zmienić port.Możesz zmienić
portwartość na dowolną dodatnią liczbę całkowitą.Jeśli to nie działa i chcesz spojrzeć dalej, spójrz
/etc/fail2ban/jail.conf, powinno być coś takiego:Właśnie tego używa fail2ban do wykrywania fałszywych danych logowania.
Jeśli to nie działa poprawnie, możesz wypróbować kilka rzeczy, aby wskazać problem. Zacznij od sprawdzenia, czy jest zainstalowany:
Sprawdź, czy usługa jest uruchomiona:
Sprawdź, czy skonfigurowano więzienie SSH:
Sprawdź plik dziennika:
Sprawdź swoją datę / godzinę:
(Najpierw należy
auth.logpodać datę, a następnie ostatnie wiersze . Jeśli nadal nie możesz wskazać błędu, dodaj plik konfiguracyjny do posta.źródło
iptables -L -v -ni / lubservice iptables statusfail2ban wykryje próby logowania z zawartością dziennika. fail2ban nie używa portów do wykrywania, tylko do blokowania.
Aby zablokować właściwy port, musisz powiedzieć fail2ban, który z nich, aby poprawnie skonfigurować iptable.
W
/etc/fail2ban/jail.local:Inną metodą jest zablokowanie wszystkiego od szkodliwych hostów. Iptable zrzuci z nich wszystkie parkiety, nie tylko ssh.
Na początku
/etc/fail2ban/jail.local:Dzięki
iptables-allportsnie musisz martwić się o porty. Po prostu zostaw te domyślne.źródło
W skrócie: jeśli zmieniłeś numer portu ssh, musisz go dodać w
jail.localpliku!Na przykład: (Używam SSH, SFTP na porcie 1234)
w
jail.local:źródło
Wiem, że nie jest to jednoznaczna odpowiedź na pytanie, ale w każdym razie ...
Jako inny sposób rozwiązania problemu można rozważyć zachowanie standardowych portów w konfiguracji serwera, a następnie wykonanie translacji NAT w routerze.
Na przykład w mojej konfiguracji nie używam również standardowego portu dla ssh z zewnątrz, ale moja konfiguracja serwera jest standardowa dla ssh (podobnie jak dla ftp, VPN itp.) Po prostu otwieram niestandardowe porty w routerze i przekaż je do standardowego portu.
Ten sposób robienia tego oszczędza mi sporo czasu podczas konfigurowania konfiguracji.
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Wiem, że to stary wątek, ale to pojawia się podczas wyszukiwania google w tym temacie. Nie widziałem, żeby ktokolwiek udzielił najbardziej poprawnej odpowiedzi (imo), więc oto jest.
Aby globalnie zmienić definicję portu o nazwie Linux, przejdź do
/etc/servicesNie ma potrzeby zmiany czegokolwiek w konfiguracji fail2ban ani w żadnej innej aplikacji korzystającej z portów o nazwie Linux.
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