FAIL2BANとは何ですか？
Fail2banはログファイルをスキャンし、悪意のある兆候を示すIPを禁止します—パスワードの失敗が多すぎる、エクスプロイトを探すなど。通常、Fail2Banを使用してファイアウォールルールを更新し、指定された期間IPアドレスを拒否します。 （例：メールの送信）も設定できます。すぐに使用できるFail2Banには、さまざまなサービス（apache、courier、sshなど）用のフィルターが付属しています。
インストール方法は？
sudo apt-get install fail2ban
Code language: Bash (bash)
設定方法は？
1.無視するIPを追加します
fail2ban-client set sshd addignoreip 151.237.48.31
Code language: Bash (bash)2.禁止時間を永続的に設定するか、10分程度の場合は3600に設定します
fail2ban-client set sshd bantime -1
Code language: Bash (bash)3.再起動
service fail2ban restart
Code language: Bash (bash)IPを禁止する方法は？
fail2ban-client set sshd banip 151.237.48.31
Code language: Bash (bash)IPの禁止を解除するにはどうすればよいですか？
fail2ban-client set sshd unbanip 151.237.48.31
Code language: Bash (bash)刑務所リストを確認するにはどうすればよいですか？
fail2ban-client status
Code language: Bash (bash)禁止されたIPを一覧表示するにはどうすればよいですか？
iptables -nL
Code language: Bash (bash)cd /etc/fail2ban
sudo cp jail.conf jail.local
sudo nano jail.local
Code language: Bash (bash)#
# WARNING: heavily refactored in 0.9.0 release. Please review and
# customize settings for your setup.
#
# Changes: in most of the cases you should not modify this
# file, but provide customizations in jail.local file,
# or separate .conf files under jail.d/ directory, e.g.:
#
# HOW TO ACTIVATE JAILS:
#
# YOU SHOULD NOT MODIFY THIS FILE.
#
# It will probably be overwritten or improved in a distribution update.
#
# Provide customizations in a jail.local file or a jail.d/customisation.local.
# For example to change the default bantime for all jails and to enable the
# ssh-iptables jail the following (uncommented) would appear in the .local file.
# See man 5 jail.conf for details.
#
# [DEFAULT]
# bantime = 3600
#
# [sshd]
#enabled = true
#
# See jail.conf(5) man page for more information
# Comments: use '#' for comment lines and ';' (following a space) for inline comments
[INCLUDES]
#before = paths-distro.conf
before = paths-debian.conf
# The DEFAULT allows a global definition of the options. They can be overridden
# in each jail afterwards.
[DEFAULT]
#
# MISCELLANEOUS OPTIONS
#
# "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 (and/or comma) separator.
ignoreip = 127.0.0.1/8 212.122.165.163
# External command that will take an tagged arguments to ignore, e.g. <ip>,
# and return true if the IP is to be ignored. False otherwise.
#
# ignorecommand = /path/to/command <ip>
ignorecommand =
# "bantime" is the number of seconds that a host is banned.
bantime = -1
# A host is banned if it has generated "maxretry" during the last "findtime"
# seconds.
findtime = 600
# "maxretry" is the number of failures before a host get banned.
maxretry = 1
# "backend" specifies the backend used to get files modification.
# Available options are "pyinotify", "gamin", "polling", "systemd" 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.
# systemd: uses systemd python library to access the systemd journal.
# Specifying "logpath" is not valid for this backend.
# See "journalmatch" in the jails associated filter config
# auto: will try to use the following backends, in order:
# pyinotify, gamin, polling.
#
# Note: if systemd backend is chosen as the default but you enable a jail
# for which logs are present only in its own log files, specify some other
# backend for that jail (e.g. polling) and provide empty value for
# journalmatch. See https://github.com/fail2ban/fail2ban/issues/959#issuecomment-74901200
backend = auto
# "usedns" specifies if jails should trust hostnames in logs,
# warn when DNS lookups are performed, or ignore all hostnames in logs
#
# yes: if a hostname is encountered, a DNS lookup will be performed.
# warn: if a hostname is encountered, a 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.
# raw: use raw value (no hostname), allow use it for no-host filters/actions (example user)
usedns = warn
# "logencoding" specifies the encoding of the log files handled by the jail
# This is used to decode the lines from the log file.
# Typical examples: "ascii", "utf-8"
#
# auto: will use the system locale setting
logencoding = auto
# "enabled" enables the jails.
# By default all jails are disabled, and it should stay this way.
# Enable only relevant to your setup jails in your .local or jail.d/*.conf
#
# true: jail will be enabled and log files will get monitored for changes
# false: jail is not enabled
enabled = false
# "filter" defines the filter to use by the jail.
# By default jails have names matching their filter name
#
filter = %(__name__)s
#
# ACTIONS
#
# Some options used for actions
# Destination email address used solely for the interpolations in
# jail.{conf,local,d/*} configuration files.
destemail = root@localhost
# Sender email address used solely for some actions
sender = root@localhost
# E-mail action. Since 0.8.1 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
# Ports to be banned
# Usually should be overridden in a particular jail
port = 0:65535
# Format of user-agent https://tools.ietf.org/html/rfc7231#section-5.5.3
fail2ban_agent = Fail2Ban/%(fail2ban_version)s
#
# Action shortcuts. To be used to define action parameter
# 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
banaction_allports = iptables-allports
# The simplest action to take: ban only
action_ = %(banaction)s[name=%(__name__)s, bantime="%(bantime)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, bantime="%(bantime)s", port="%(port)s", protocol="%(protocol)s", chain="%(chain)s"]
%(mta)s-whois[name=%(__name__)s, sender="%(sender)s", dest="%(destemail)s", protocol="%(protocol)s", chain="%(chain)s"]
# ban & send an e-mail with whois report and relevant log lines
# to the destemail.
action_mwl = %(banaction)s[name=%(__name__)s, bantime="%(bantime)s", port="%(port)s", protocol="%(protocol)s", chain="%(chain)s"]
%(mta)s-whois-lines[name=%(__name__)s, sender="%(sender)s", dest="%(destemail)s", logpath=%(logpath)s, chain="%(chain)s"]
# See the IMPORTANT note in action.d/xarf-login-attack for when to use this action
#
# ban & send a xarf e-mail to abuse contact of IP address and include relevant log lines
# to the destemail.
action_xarf = %(banaction)s[name=%(__name__)s, bantime="%(bantime)s", port="%(port)s", protocol="%(protocol)s", chain="%(chain)s"]
xarf-login-attack[service=%(__name__)s, sender="%(sender)s", logpath=%(logpath)s, port="%(port)s"]
# ban IP on CloudFlare & send an e-mail with whois report and relevant log lines
# to the destemail.
action_cf_mwl = cloudflare[cfuser="%(cfemail)s", cftoken="%(cfapikey)s"]
%(mta)s-whois-lines[name=%(__name__)s, sender="%(sender)s", dest="%(destemail)s", logpath=%(logpath)s, chain="%(chain)s"]
# Report block via blocklist.de fail2ban reporting service API
#
# See the IMPORTANT note in action.d/blocklist_de.conf for when to
# use this action. Create a file jail.d/blocklist_de.local containing
# [Init]
# blocklist_de_apikey = {api key from registration]
#
action_blocklist_de = blocklist_de[email="%(sender)s", service=%(filter)s, apikey="%(blocklist_de_apikey)s", agent="%(fail2ban_agent)s"]
# Report ban via badips.com, and use as blacklist
#
# See BadIPsAction docstring in config/action.d/badips.py for
# documentation for this action.
#
# NOTE: This action relies on banaction being present on start and therefore
# should be last action defined for a jail.
#
action_badips = badips.py[category="%(__name__)s", banaction="%(banaction)s", agent="%(fail2ban_agent)s"]
#
# Report ban via badips.com (uses action.d/badips.conf for reporting only)
#
action_badips_report = badips[category="%(__name__)s", agent="%(fail2ban_agent)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
#
#
# SSH servers
#
[sshd]
enabled = true
port = 0:65535
logpath = %(sshd_log)s
backend = %(sshd_backend)s
banaction = iptables-multiport
[sshd-ddos]
# This jail corresponds to the standard configuration in Fail2ban.
# The mail-whois action send a notification e-mail with a whois request
# in the body.
enabled = true
port = 0:65535
logpath = %(sshd_log)s
backend = %(sshd_backend)s
[dropbear]
port = ssh
logpath = %(dropbear_log)s
backend = %(dropbear_backend)s
[selinux-ssh]
port = ssh
logpath = %(auditd_log)s
#
# HTTP servers
#
[apache]
enabled = true
port = 0:65535
filter = apache-auth
logpath = /var/log/apache2/*error.log
maxretry = 3
findtime = 600
#ignoreip = 192.168.1.227
[apache-auth]
enabled = true
port = 0:65535
logpath = %(apache_error_log)s
[apache-badbots]
# Ban hosts which agent identifies spammer robots crawling the web
# for email addresses. The mail outputs are buffered.
enabled = true
port = 0:65535
logpath = %(apache_access_log)s
bantime = -1
maxretry = 1
[apache-noscript]
enabled = true
port = http,https
logpath = %(apache_error_log)s
[apache-overflows]
enabled = true
port = 0:65535
logpath = %(apache_error_log)s
maxretry = 2
[apache-nohome]
enabled = true
port = 0:65535
logpath = %(apache_error_log)s
maxretry = 2
[apache-botsearch]
enabled = true
port = 0:65535
logpath = %(apache_error_log)s
maxretry = 2
[apache-fakegooglebot]
enabled = true
port = 0:65535
logpath = %(apache_access_log)s
maxretry = 1
ignorecommand = %(ignorecommands_dir)s/apache-fakegooglebot <ip>
[apache-modsecurity]
enabled = true
port = 0:65535
logpath = %(apache_error_log)s
maxretry = 2
[apache-shellshock]
enabled = true
port = 0:65535
logpath = %(apache_error_log)s
maxretry = 1
[openhab-auth]
filter = openhab
action = iptables-allports[name=NoAuthFailures]
logpath = /opt/openhab/logs/request.log
[nginx-http-auth]
port = http,https
logpath = %(nginx_error_log)s
# To use 'nginx-limit-req' jail you should have `ngx_http_limit_req_module`
# and define `limit_req` and `limit_req_zone` as described in nginx documentation
# http://nginx.org/en/docs/http/ngx_http_limit_req_module.html
# or for example see in 'config/filter.d/nginx-limit-req.conf'
[nginx-limit-req]
port = http,https
logpath = %(nginx_error_log)s
[nginx-botsearch]
port = http,https
logpath = %(nginx_error_log)s
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 = true
port = http,https
logpath = %(nginx_access_log)s
%(apache_access_log)s
[suhosin]
port = http,https
logpath = %(suhosin_log)s
[lighttpd-auth]
# Same as above for Apache's mod_auth
# It catches wrong authentifications
port = http,https
logpath = %(lighttpd_error_log)s
#
# Webmail and groupware servers
#
[roundcube-auth]
port = http,https
logpath = %(roundcube_errors_log)s
[openwebmail]
port = http,https
logpath = /var/log/openwebmail.log
[horde]
port = http,https
logpath = /var/log/horde/horde.log
[groupoffice]
port = http,https
logpath = /home/groupoffice/log/info.log
[sogo-auth]
# Monitor SOGo groupware server
# without proxy this would be:
# port = 20000
port = http,https
logpath = /var/log/sogo/sogo.log
[tine20]
logpath = /var/log/tine20/tine20.log
port = http,https
#
# Web Applications
#
#
[drupal-auth]
port = http,https
logpath = %(syslog_daemon)s
backend = %(syslog_backend)s
[guacamole]
port = http,https
logpath = /var/log/tomcat*/catalina.out
[monit]
#Ban clients brute-forcing the monit gui login
port = 2812
logpath = /var/log/monit
[webmin-auth]
port = 10000
logpath = %(syslog_authpriv)s
backend = %(syslog_backend)s
[froxlor-auth]
port = http,https
logpath = %(syslog_authpriv)s
backend = %(syslog_backend)s
#
# HTTP Proxy servers
#
#
[squid]
port = 80,443,3128,8080
logpath = /var/log/squid/access.log
[3proxy]
port = 3128
logpath = /var/log/3proxy.log
#
# FTP servers
#
[proftpd]
port = ftp,ftp-data,ftps,ftps-data
logpath = %(proftpd_log)s
backend = %(proftpd_backend)s
[pure-ftpd]
port = ftp,ftp-data,ftps,ftps-data
logpath = %(pureftpd_log)s
backend = %(pureftpd_backend)s
[gssftpd]
port = ftp,ftp-data,ftps,ftps-data
logpath = %(syslog_daemon)s
backend = %(syslog_backend)s
[wuftpd]
port = ftp,ftp-data,ftps,ftps-data
logpath = %(wuftpd_log)s
backend = %(wuftpd_backend)s
[vsftpd]
# or overwrite it in jails.local to be
# logpath = %(syslog_authpriv)s
# if you want to rely on PAM failed login attempts
# vsftpd's failregex should match both of those formats
port = ftp,ftp-data,ftps,ftps-data
logpath = %(vsftpd_log)s
#
# Mail servers
#
# ASSP SMTP Proxy Jail
[assp]
port = smtp,465,submission
logpath = /root/path/to/assp/logs/maillog.txt
[courier-smtp]
port = smtp,465,submission
logpath = %(syslog_mail)s
backend = %(syslog_backend)s
[postfix]
port = smtp,465,submission
logpath = %(postfix_log)s
backend = %(postfix_backend)s
[postfix-rbl]
port = smtp,465,submission
logpath = %(postfix_log)s
backend = %(postfix_backend)s
maxretry = 1
[sendmail-auth]
port = submission,465,smtp
logpath = %(syslog_mail)s
backend = %(syslog_backend)s
[sendmail-reject]
port = smtp,465,submission
logpath = %(syslog_mail)s
backend = %(syslog_backend)s
[qmail-rbl]
filter = qmail
port = smtp,465,submission
logpath = /service/qmail/log/main/current
# dovecot defaults to logging to the mail syslog facility
# but can be set by syslog_facility in the dovecot configuration.
[dovecot]
port = pop3,pop3s,imap,imaps,submission,465,sieve
logpath = %(dovecot_log)s
backend = %(dovecot_backend)s
[sieve]
port = smtp,465,submission
logpath = %(dovecot_log)s
backend = %(dovecot_backend)s
[solid-pop3d]
port = pop3,pop3s
logpath = %(solidpop3d_log)s
[exim]
port = smtp,465,submission
logpath = %(exim_main_log)s
[exim-spam]
port = smtp,465,submission
logpath = %(exim_main_log)s
[kerio]
port = imap,smtp,imaps,465
logpath = /opt/kerio/mailserver/store/logs/security.log
#
# Mail servers authenticators: might be used for smtp,ftp,imap servers, so
# all relevant ports get banned
#
[courier-auth]
port = smtp,465,submission,imap3,imaps,pop3,pop3s
logpath = %(syslog_mail)s
backend = %(syslog_backend)s
[postfix-sasl]
port = smtp,465,submission,imap3,imaps,pop3,pop3s
# 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 = %(postfix_log)s
backend = %(postfix_backend)s
[perdition]
port = imap3,imaps,pop3,pop3s
logpath = %(syslog_mail)s
backend = %(syslog_backend)s
[squirrelmail]
port = smtp,465,submission,imap2,imap3,imaps,pop3,pop3s,http,https,socks
logpath = /var/lib/squirrelmail/prefs/squirrelmail_access_log
[cyrus-imap]
port = imap3,imaps
logpath = %(syslog_mail)s
backend = %(syslog_backend)s
[uwimap-auth]
port = imap3,imaps
logpath = %(syslog_mail)s
backend = %(syslog_backend)s
#
#
# DNS servers
#
# !!! 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.
#
# IMPORTANT: see filter.d/named-refused for instructions to enable logging
# This jail blocks UDP traffic for DNS requests.
# [named-refused-udp]
#
# filter = named-refused
# port = domain,953
# protocol = udp
# logpath = /var/log/named/security.log
# IMPORTANT: see filter.d/named-refused for instructions to enable logging
# This jail blocks TCP traffic for DNS requests.
[named-refused]
port = domain,953
logpath = /var/log/named/security.log
[nsd]
port = 53
action = %(banaction)s[name=%(__name__)s-tcp, port="%(port)s", protocol="tcp", chain="%(chain)s", actname=%(banaction)s-tcp]
%(banaction)s[name=%(__name__)s-udp, port="%(port)s", protocol="udp", chain="%(chain)s", actname=%(banaction)s-udp]
logpath = /var/log/nsd.log
#
# Miscellaneous
#
[asterisk]
port = 5060,5061
action = %(banaction)s[name=%(__name__)s-tcp, port="%(port)s", protocol="tcp", chain="%(chain)s", actname=%(banaction)s-tcp]
%(banaction)s[name=%(__name__)s-udp, port="%(port)s", protocol="udp", chain="%(chain)s", actname=%(banaction)s-udp]
%(mta)s-whois[name=%(__name__)s, dest="%(destemail)s"]
logpath = /var/log/asterisk/messages
maxretry = 10
[freeswitch]
port = 5060,5061
action = %(banaction)s[name=%(__name__)s-tcp, port="%(port)s", protocol="tcp", chain="%(chain)s", actname=%(banaction)s-tcp]
%(banaction)s[name=%(__name__)s-udp, port="%(port)s", protocol="udp", chain="%(chain)s", actname=%(banaction)s-udp]
%(mta)s-whois[name=%(__name__)s, dest="%(destemail)s"]
logpath = /var/log/freeswitch.log
maxretry = 10
# To log wrong MySQL access attempts add to /etc/my.cnf in [mysqld] or
# equivalent section:
# log-warning = 2
#
# for syslog (daemon facility)
# [mysqld_safe]
# syslog
#
# for own logfile
# [mysqld]
# log-error=/var/log/mysqld.log
[mysqld-auth]
#enabled = true
port = 3306
logpath = %(mysql_log)s
backend = %(mysql_backend)s
# Log wrong MongoDB auth (for details see filter 'filter.d/mongodb-auth.conf')
[mongodb-auth]
# change port when running with "--shardsvr" or "--configsvr" runtime operation
port = 27017
logpath = /var/log/mongodb/mongodb.log
# Jail for more extended banning of persistent abusers
# !!! WARNINGS !!!
# 1. 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
# 2. Increase dbpurgeage defined in fail2ban.conf to e.g. 648000 (7.5 days)
# to maintain entries for failed logins for sufficient amount of time
[recidive]
logpath = /var/log/fail2ban.log
banaction = %(banaction_allports)s
bantime = 604800 ; 1 week
findtime = 86400 ; 1 day
# Generic filter for PAM. Has to be used with action which bans all
# ports such as iptables-allports, shorewall
[pam-generic]
# pam-generic filter can be customized to monitor specific subset of 'tty's
banaction = %(banaction_allports)s
logpath = %(syslog_authpriv)s
backend = %(syslog_backend)s
[xinetd-fail]
banaction = iptables-multiport-log
logpath = %(syslog_daemon)s
backend = %(syslog_backend)s
maxretry = 2
# stunnel - need to set port for this
[stunnel]
logpath = /var/log/stunnel4/stunnel.log
[ejabberd-auth]
port = 5222
logpath = /var/log/ejabberd/ejabberd.log
[counter-strike]
logpath = /opt/cstrike/logs/L[0-9]*.log
# Firewall: http://www.cstrike-planet.com/faq/6
tcpport = 27030,27031,27032,27033,27034,27035,27036,27037,27038,27039
udpport = 1200,27000,27001,27002,27003,27004,27005,27006,27007,27008,27009,27010,27011,27012,27013,27014,27015
action = %(banaction)s[name=%(__name__)s-tcp, port="%(tcpport)s", protocol="tcp", chain="%(chain)s", actname=%(banaction)s-tcp]
%(banaction)s[name=%(__name__)s-udp, port="%(udpport)s", protocol="udp", chain="%(chain)s", actname=%(banaction)s-udp]
# consider low maxretry and a long bantime
# nobody except your own Nagios server should ever probe nrpe
[nagios]
logpath = %(syslog_daemon)s ; nrpe.cfg may define a different log_facility
backend = %(syslog_backend)s
maxretry = 1
[oracleims]
# see "oracleims" filter file for configuration requirement for Oracle IMS v6 and above
logpath = /opt/sun/comms/messaging64/log/mail.log_current
banaction = %(banaction_allports)s
[directadmin]
logpath = /var/log/directadmin/login.log
port = 2222
[portsentry]
logpath = /var/lib/portsentry/portsentry.history
maxretry = 1
[pass2allow-ftp]
# this pass2allow example allows FTP traffic after successful HTTP authentication
port = ftp,ftp-data,ftps,ftps-data
# knocking_url variable must be overridden to some secret value in jail.local
knocking_url = /knocking/
filter = apache-pass[knocking_url="%(knocking_url)s"]
# access log of the website with HTTP auth
logpath = %(apache_access_log)s
blocktype = RETURN
returntype = DROP
bantime = 3600
maxretry = 1
findtime = 1
[murmur]
# AKA mumble-server
port = 64738
action = %(banaction)s[name=%(__name__)s-tcp, port="%(port)s", protocol=tcp, chain="%(chain)s", actname=%(banaction)s-tcp]
%(banaction)s[name=%(__name__)s-udp, port="%(port)s", protocol=udp, chain="%(chain)s", actname=%(banaction)s-udp]
logpath = /var/log/mumble-server/mumble-server.log
[screensharingd]
# For Mac OS Screen Sharing Service (VNC)
logpath = /var/log/system.log
logencoding = utf-8
[haproxy-http-auth]
# HAProxy by default doesn't log to file you'll need to set it up to forward
# logs to a syslog server which would then write them to disk.
# See "haproxy-http-auth" filter for a brief cautionary note when setting
# maxretry and findtime.
logpath = /var/log/haproxy.log
[slapd]
port = ldap,ldaps
filter = slapd
logpath = /var/log/slapd.log
Code language: Basic (basic)この後、サービスfail2banrestartを使用してfail2banを再起動し、すべてのjailが次の方法でロードされているかどうかを確認する必要があります。
fail2ban-client status status
Code language: Bash (bash)