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#!/bin/sh
# $Id: fail2ban.sh 2815 2020-05-03 22:10:04Z rexy $

JAIL_CONF="/etc/fail2ban/jail.conf"
DIR_FILTER="/etc/fail2ban/filter.d/"
ACTION_ALLPORTS="/etc/fail2ban/action.d/iptables-allports.conf"

#########################################################
## Mise à jour de la configuration de jail de fail2ban ##
#########################################################
[ -f $JAIL_CONF ] && [ ! -e $JAIL_CONF.default ] && mv $JAIL_CONF $JAIL_CONF.default
cat << EOF > $JAIL_CONF

# Fail2Ban configuration file
#
# Author: Cyril Jaquier
# Adapted by ALCASAR team


# 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  = 180

# A host is banned if it has generated "maxretry" during the last "findtime" seconds.
# Un client est banni s'il génere "maxretry" requêtes pendant "findtime" (en secondes)
# Pour ALCASAR : 5 requetes pour chaque filtres en 60 secondes
findtime  = 60

# "maxretry" is the number of failures before a host get banned.
maxretry = 5

# "backend" specifies the backend used to get files modification. Available
# options are "gamin", "polling" and "auto". This option can be overridden in
# each jail too (use "gamin" for a jail and "polling" for another).
#
# gamin:   requires Gamin (a file alteration monitor) to be installed. If Gamin
#          is not installed, Fail2ban will use polling.
# polling: uses a polling algorithm which does not require external libraries.
# auto:    will choose Gamin if available and polling otherwise.
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.
usedns = warn

# Bannissement sur tous les ports après 3 refus du serveur WEB (tentative d'accès sur des pages inexistentes)
[alcasar_mod-evasive]

#enabled = true
enabled = false
backend = auto
filter = alcasar_mod-evasive
action = iptables-allports[name=alcasar_mod-evasive]
logpath = /var/log/lighttpd/access.log
maxretry = 3

# Bannissement sur tout les ports après 3 refus de SSH (tentative d'accès par brute-force)
[ssh-iptables]

enabled = true
#enabled  = false
filter   = sshd
action   = iptables-allports[name=SSH]
logpath  = /var/log/auth.log
maxretry = 3

# Bannissement sur tous les ports après 5 échecs de connexion sur le centre de contrôle (ACC)
[alcasar_acc]

enabled = true
#enabled = false
backend = auto
filter = alcasar_acc
action = iptables-allports[name=alcasar_acc]
logpath = /var/log/lighttpd/access.log
maxretry = 6

# Bannissement sur tout les ports après 5 echecs de connexion pour un usager
[alcasar_intercept]

enabled = true
#enabled = false
backend = auto
filter = alcasar_intercept
action = iptables-allports[name=alcasar_intercept]
logpath = /var/log/lighttpd/access.log
maxretry = 5

# Bannissement sur tout les port après 5 échecs de changement de mot de passe
# 5 POST pour changer le mot de passe que le POST soit ok ou non.
[alcasar_change-pwd]

enabled = true
#enabled = false
backend = auto
filter = alcasar_change-pwd
action = iptables-allports[name=alcasar_change-pwd]
logpath = /var/log/lighttpd/access.log
maxretry = 5

EOF

##################################################
## Mise en place des filtres spécifiques       ##
## - Mod_evasive.conf                           ##
## - acc-htdigest.conf                          ##
## - intercept.conf                             ##
## - change-pwd.conf                            ##
##################################################

######################
## MOD-EVASIVE.CONF ##
######################
cat << EOF > $DIR_FILTER/alcasar_mod-evasive.conf
# Fail2Ban configuration file
#
# Author: Cyril Jaquier
# Adapted by ALCASAR team

[Definition]

# Option:  failregex
# Notes.:  regex to match the password failure messages in the logfile. The
#          host must be matched by a group named "host". The tag "<HOST>" can
#          be used for standard IP/hostname matching and is only an alias for
#          (?:::f{4,6}:)?(?P<host>[\w\-.^_]+)
# Values:  TEXT
#
failregex =  <HOST> .+\] "[^"]+" 403

# Option:  ignoreregex
# Notes.:  regex to ignore. If this regex matches, the line is ignored.
# Values:  TEXT
#
ignoreregex =
EOF

#######################
## ACC-HTDIGEST.CONF ##
#######################
cat << EOF > $DIR_FILTER/alcasar_acc.conf
# Fail2Ban configuration file
#
# Author: Cyril Jaquier
# Adapted by ALCASAR team

[Definition]

# Option:  failregex
# Notes.:  regex to match the password failure messages in the logfile. The
#          host must be matched by a group named "
host". The tag "<HOST>" can
#          be used for standard IP/hostname matching and is only an alias for
#          (?:::f{4,6}:)?(?P<host>[\w\-.^_]+)
# Values:  TEXT
#
failregex =  <HOST> .+\] "
[^"]+" 401

#[[]auth_digest:error[]] [[]client <HOST>:[0-9]\{1,5\}[]]

# Option:  ignoreregex
# Notes.:  regex to ignore. If this regex matches, the line is ignored.
# Values:  TEXT
#
ignoreregex =
EOF

####################
## INTERCEPT.CONF ##
####################
cat << EOF > $DIR_FILTER/alcasar_intercept.conf
# Fail2Ban configuration file
#
# Author: Cyril Jaquier
# Adapted by ALCASAR team

[Definition]

# Option:  failregex
# Notes.:  regex to match the password failure messages in the logfile. The
#          host must be matched by a group named "host". The tag "<HOST>" can
#          be used for standard IP/hostname matching and is only an alias for
#          (?:::f{4,6}:)?(?P<host>[\w\-.^_]+)
# Values:  TEXT
#
failregex = <HOST> .* \"GET \/intercept\.php\?res=failed\&reason=reject

# Option:  ignoreregex
# Notes.:  regex to ignore. If this regex matches, the line is ignored.
# Values:  TEXT
#
ignoreregex =
EOF

#####################
## CHANGE-PWD.CONF ##
#####################
cat << EOF > $DIR_FILTER/alcasar_change-pwd.conf

# Fail2Ban configuration file
#
# Author: Cyril Jaquier
# Adapted by ALCASAR team

[Definition]

# Option:  failregex
# Notes.:  regex to match the password failure messages in the logfile. The
#          host must be matched by a group named "host". The tag "<HOST>" can
#          be used for standard IP/hostname matching and is only an alias for
#          (?:::f{4,6}:)?(?P<host>[\w\-.^_]+)
# Values:  TEXT
#
failregex = <HOST> .* \"POST \/password\.php


# Option:  ignoreregex
# Notes.:  regex to ignore. If this regex matches, the line is ignored.
# Values:  TEXT
#
ignoreregex =
EOF

##############################################
##   Log sur ULOG quand iptables-allports   ##
##############################################
[ -f $ACTION_ALLPORTS ] && [ ! -e $ACTION_ALLPORTS.default ] && mv $ACTION_ALLPORTS $ACTION_ALLPORTS.default
cat << EOF > $ACTION_ALLPORTS
# Fail2Ban configuration file
#
# Author: Cyril Jaquier
# Modified: Yaroslav O. Halchenko <debian@onerussian.com>
#                       made active on all ports from original iptables.conf
# Adapted by ALCASAR team

[Definition]

# Option:  actionstart
# Notes.:  command executed once at the start of Fail2Ban.
# Values:  CMD
#
actionstart = iptables -N fail2ban-<name>
              iptables -A fail2ban-<name> -j RETURN
              iptables -I <chain> -p <protocol> -j fail2ban-<name>

# Option:  actionstop
# Notes.:  command executed once at the end of Fail2Ban
# Values:  CMD
#
actionstop = iptables -D <chain> -p <protocol> -j fail2ban-<name>
             iptables -F fail2ban-<name>
             iptables -X fail2ban-<name>

# Option:  actioncheck
# Notes.:  command executed once before each actionban command
# Values:  CMD
#
actioncheck = iptables -n -L <chain> | grep -q fail2ban-<name>

# Option:  actionban
# Notes.:  command executed when banning an IP. Take care that the
#          command is executed with Fail2Ban user rights.
# Tags:    <ip>  IP address
#          <failures>  number of failures
#          <time>  unix timestamp of the ban time
# Values:  CMD

actionban = iptables -I fail2ban-<name> 1 -s <ip> -j DROP

# Option:  actionunban
# Notes.:  command executed when unbanning an IP. Take care that the
#          command is executed with Fail2Ban user rights.
# Tags:    <ip>  IP address
#          <failures>  number of failures
#          <time>  unix timestamp of the ban time
# Values:  CMD
#
actionunban = iptables -D fail2ban-<name> -s <ip> -j DROP

[Init]

# Defaut name of the chain
#
name = default

# Option:  protocol
# Notes.:  internally used by config reader for interpolations.
# Values:  [ tcp | udp | icmp | all ] Default: tcp
#
protocol = tcp

# Option:  chain
# Notes    specifies the iptables chain to which the fail2ban rules should be
#          added
# Values:  STRING  Default: INPUT
chain = INPUT

EOF