Estoy tratando de descubrir por quéFail2BanNo parece estar haciendo nada en mi servidor.
Este es un servidor Ubuntu 14.04:
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.5 LTS
Release: 14.04
Codename: trusty
Fail2Ban v0.8.11 instalado desde los repositorios de Ubuntu/Debian:
$ fail2ban-client --version
Fail2Ban v0.8.11
...
Fail2Ban parece estar ejecutándose:
$ sudo fail2ban-client status
Status
|- Number of jail: 3
`- Jail list: pam-generic, ssh-ddos, ssh
Pero si sshentro en una máquina virtual de Digital Ocean y desde allí intento repetidamente y falla sshel acceso al servidor, no parece prohibirme. Puedo hacer esto tantas veces como quiera:
$ ssh -p 6879 ubuntu@my_server.net
Permission denied (publickey).
No veo nada en los registros de fail2ban aparte de mensajes sobre su inicio:
$ sudo tail -n 10 /var/log/fail2ban.log
2018-02-26 14:48:42,691 fail2ban.jail : INFO Creating new jail 'ssh-ddos'
2018-02-26 14:48:42,691 fail2ban.jail : INFO Jail 'ssh-ddos' uses pyinotify
2018-02-26 14:48:42,694 fail2ban.jail : INFO Initiated 'pyinotify' backend
2018-02-26 14:48:42,694 fail2ban.filter : INFO Added logfile = /var/log/auth.log
2018-02-26 14:48:42,695 fail2ban.filter : INFO Set maxRetry = 6
2018-02-26 14:48:42,696 fail2ban.filter : INFO Set findtime = 600
2018-02-26 14:48:42,696 fail2ban.actions: INFO Set banTime = 86400
2018-02-26 14:48:42,700 fail2ban.jail : INFO Jail 'ssh' started
2018-02-26 14:48:42,702 fail2ban.jail : INFO Jail 'pam-generic' started
2018-02-26 14:48:42,703 fail2ban.jail : INFO Jail 'ssh-ddos' started
Mi configuración de fail2ban es justo lo que viene empaquetado con Ubuntu/Debian, además de un jail.localarchivo propio.
Aquí está mi /etc/fail2ban/jail.localarchivo (nota: he intentado cambiarlo [ssh]y [sshd]agregarle filter=sshd, logpath = /var/log/auth.logno hay diferencia):
[DEFAULT]
ignoreip = 127.0.0.1 10.1.3.105
bantime = 86400
destemail = <MY EMAIL>
banaction = iptables-multiport
action = %(action_)s
# JAILS
[ssh]
enabled = true
maxretry = 3
port = 6879
[pam-generic]
enabled = true
banaction = iptables-allports
[ssh-ddos]
enabled = true
Y aquí está mi /etc/fail2ban/jail.confarchivo, que no ha sido modificado con respecto a lo que viene empaquetado con Ubuntu 14.04:
# 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.
#
# Comments: use '#' for comment lines and ';' for inline comments
#
# To avoid merges during upgrades DO NOT MODIFY THIS FILE
# and rather provide your changes in /etc/fail2ban/jail.local
#
# The DEFAULT allows a global definition of the options. They can be overridden
# in each jail afterwards.
[DEFAULT]
# "ignoreip" can be an IP address, a CIDR mask or a DNS host. Fail2ban will not
# ban a host which matches an address in this list. Several addresses can be
# defined using space separator.
ignoreip = 127.0.0.1/8
# "bantime" is the number of seconds that a host is banned.
bantime = 600
# A host is banned if it has generated "maxretry" during the last "findtime"
# seconds.
findtime = 600
maxretry = 3
# "backend" specifies the backend used to get files modification.
# Available options are "pyinotify", "gamin", "polling" and "auto".
# This option can be overridden in each jail as well.
#
# pyinotify: requires pyinotify (a file alteration monitor) to be installed.
# If pyinotify is not installed, Fail2ban will use auto.
# gamin: requires Gamin (a file alteration monitor) to be installed.
# If Gamin is not installed, Fail2ban will use auto.
# polling: uses a polling algorithm which does not require external libraries.
# auto: will try to use the following backends, in order:
# pyinotify, gamin, polling.
backend = auto
# "usedns" specifies if jails should trust hostnames in logs,
# warn when reverse DNS lookups are performed, or ignore all hostnames in logs
#
# yes: if a hostname is encountered, a reverse DNS lookup will be performed.
# warn: if a hostname is encountered, a reverse DNS lookup will be performed,
# but it will be logged as a warning.
# no: if a hostname is encountered, will not be used for banning,
# but it will be logged as info.
usedns = warn
#
# Destination email address used solely for the interpolations in
# jail.{conf,local} configuration files.
destemail = root@localhost
#
# Name of the sender for mta actions
sendername = Fail2Ban
#
# ACTIONS
#
# Default banning action (e.g. iptables, iptables-new,
# iptables-multiport, shorewall, etc) It is used to define
# action_* variables. Can be overridden 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
# Specify chain where jumps would need to be added in iptables-* actions
chain = INPUT
#
# 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", chain="%(chain)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", chain="%(chain)s"]
%(mta)s-whois[name=%(__name__)s, dest="%(destemail)s", protocol="%(protocol)s", chain="%(chain)s", sendername="%(sendername)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", chain="%(chain)s"]
%(mta)s-whois-lines[name=%(__name__)s, dest="%(destemail)s", logpath=%(logpath)s, chain="%(chain)s", sendername="%(sendername)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 = 6
[dropbear]
enabled = false
port = ssh
filter = dropbear
logpath = /var/log/auth.log
maxretry = 6
# 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 = false
port = ssh
filter = sshd-ddos
logpath = /var/log/auth.log
maxretry = 6
# Here we use blackhole routes for not requiring any additional kernel support
# to store large volumes of banned IPs
[ssh-route]
enabled = false
filter = sshd
action = route
logpath = /var/log/sshd.log
maxretry = 6
# Here we use a combination of Netfilter/Iptables and IPsets
# for storing large volumes of banned IPs
#
# IPset comes in two versions. See ipset -V for which one to use
# requires the ipset package and kernel support.
[ssh-iptables-ipset4]
enabled = false
port = ssh
filter = sshd
banaction = iptables-ipset-proto4
logpath = /var/log/sshd.log
maxretry = 6
[ssh-iptables-ipset6]
enabled = false
port = ssh
filter = sshd
banaction = iptables-ipset-proto6
logpath = /var/log/sshd.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
# Ban attackers that try to use PHP's URL-fopen() functionality
# through GET/POST variables. - Experimental, with more than a year
# of usage in production environments.
[php-url-fopen]
enabled = false
port = http,https
filter = php-url-fopen
logpath = /var/www/*/logs/access_log
# A simple PHP-fastcgi jail which works with lighttpd.
# If you run a lighttpd server, then you probably will
# find these kinds of messages in your error_log:
# ALERT – tried to register forbidden variable ‘GLOBALS’
# through GET variables (attacker '1.2.3.4', file '/var/www/default/htdocs/index.php')
[lighttpd-fastcgi]
enabled = false
port = http,https
filter = lighttpd-fastcgi
logpath = /var/log/lighttpd/error.log
# Same as above for mod_auth
# It catches wrong authentifications
[lighttpd-auth]
enabled = false
port = http,https
filter = suhosin
logpath = /var/log/lighttpd/error.log
[nginx-http-auth]
enabled = false
filter = nginx-http-auth
port = http,https
logpath = /var/log/nginx/error.log
# Monitor roundcube server
[roundcube-auth]
enabled = false
filter = roundcube-auth
port = http,https
logpath = /var/log/roundcube/userlogins
[sogo-auth]
enabled = false
filter = sogo-auth
port = http, https
# without proxy this would be:
# port = 20000
logpath = /var/log/sogo/sogo.log
#
# 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
[pure-ftpd]
enabled = false
port = ftp,ftp-data,ftps,ftps-data
filter = pure-ftpd
logpath = /var/log/syslog
maxretry = 6
[wuftpd]
enabled = false
port = ftp,ftp-data,ftps,ftps-data
filter = wuftpd
logpath = /var/log/syslog
maxretry = 6
#
# Mail servers
#
[postfix]
enabled = false
port = smtp,ssmtp,submission
filter = postfix
logpath = /var/log/mail.log
[couriersmtp]
enabled = false
port = smtp,ssmtp,submission
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,submission,imap2,imap3,imaps,pop3,pop3s
filter = courierlogin
logpath = /var/log/mail.log
[sasl]
enabled = false
port = smtp,ssmtp,submission,imap2,imap3,imaps,pop3,pop3s
filter = postfix-sasl
# You might consider monitoring /var/log/mail.warn instead if you are
# running postfix since it would provide the same log lines at the
# "warn" level but overall at the smaller filesize.
logpath = /var/log/mail.log
[dovecot]
enabled = false
port = smtp,ssmtp,submission,imap2,imap3,imaps,pop3,pop3s
filter = dovecot
logpath = /var/log/mail.log
# To log wrong MySQL access attempts add to /etc/my.cnf:
# log-error=/var/log/mysqld.log
# log-warning = 2
[mysqld-auth]
enabled = false
filter = mysqld-auth
port = 3306
logpath = /var/log/mysqld.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 connection-less protocol, spoofing of IP and imitation
# 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
# Multiple jails, 1 per protocol, are necessary ATM:
# see https://github.com/fail2ban/fail2ban/issues/37
[asterisk-tcp]
enabled = false
filter = asterisk
port = 5060,5061
protocol = tcp
logpath = /var/log/asterisk/messages
[asterisk-udp]
enabled = false
filter = asterisk
port = 5060,5061
protocol = udp
logpath = /var/log/asterisk/messages
# Jail for more extended banning of persistent abusers
# !!! WARNING !!!
# Make sure that your loglevel specified in fail2ban.conf/.local
# is not at DEBUG level -- which might then cause fail2ban to fall into
# an infinite loop constantly feeding itself with non-informative lines
[recidive]
enabled = false
filter = recidive
logpath = /var/log/fail2ban.log
action = iptables-allports[name=recidive]
sendmail-whois-lines[name=recidive, logpath=/var/log/fail2ban.log]
bantime = 604800 ; 1 week
findtime = 86400 ; 1 day
maxretry = 5
Respuesta1
El siguiente número puede resultar útil para obtener más información:https://github.com/fail2ban/fail2ban/issues/2765, aunque se relaciona con versiones más recientes de fail2ban que la mencionada en la pregunta.
De forma predeterminada, el sshdfiltro no prohíbe los repetidos intentos fallidos de inicio de sesión con contraseña para un usuario existente/válido.
En másversiones recientes(aunque aún no está disponible en 0.11.1), el sshdfiltro tiene un publickeyparámetro que se puede configurar anypara capturar estos intentos fallidos:
[sshd]
publickey = any
...
De lo contrario, existe la opción de usar ddos(¿equivalente a su ssh-dosfiltro anterior?) o aggressivemodo para el sshdfiltro (que detectaría las entradas del registro de "conexión cerrada" seguidas de intentos fallidos de inicio de sesión):
[sshd]
mode = aggressive
...
Finalmente (y esto debería ser útil en cualquier versión de fail2ban que no tenga el publickeyparámetro en el sshdfiltro), puede agregar la siguiente expresión regular a su filtrocomo se sugiere aquí:
[sshd]
failregex = %(known/failregex)s
^Failed publickey for <F-USER>.+</F-USER> from <HOST>
Respuesta2
Esto funcionó para mí en Debian 10.
[sshd]
failregex = %(known/failregex)s
^.*Connection closed by authenticating user [a-z][-a-z0-9_]* <HOST> port \d+ \[preauth\]
Respuesta3
Debe verificar si garmin o pyinotify están instalados. Fail2ban necesita que al menos uno de ellos lea el registro /var/log/secureperiódicamente.
pip list |grep garmin
pip list |grep pyinotify