139 lines
4.0 KiB
Bash
Executable File
139 lines
4.0 KiB
Bash
Executable File
#!/bin/sh
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. ./myserver.conf
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install_package(){
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pkg_add ssh_guard curl
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useradd -s /sbin/nologin -d /var/empty _pfbadhost
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ftp https://geoghegan.ca/pub/pf-badhost/0.5/pf-badhost.sh
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install -m 755 -o root -g bin pf-badhost.sh /usr/local/bin/pf-badhost
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install -m 640 -o _pfbadhost -g wheel /dev/null /etc/pf-badhost.txt
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install -d -m 755 -o root -g wheel /var/log/pf-badhost
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install -m 640 -o _pfbadhost -g wheel /dev/null /var/log/pf-badhost/pf-badhost.log
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install -m 640 -o _pfbadhost -g wheel /dev/null /var/log/pf-badhost/pf-badhost.log.0.gz
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cp -v /etc/doas.conf /etc/doas.conf.old
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egrep -v "_pfbadhost" /etc/doas.conf > /tmp/doas.conf
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cat >> /tmp/doas.conf <<EOF
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# Pf badhost
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permit nopass _pfbadhost as root cmd /sbin/pfctl args -nf /etc/pf.conf
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permit nopass _pfbadhost as root cmd /sbin/pfctl args -t pfbadhost -T replace -f /etc/pf-badhost.txt
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permit nopass _pfbadhost as root cmd /usr/bin/zcat args -f /var/log/authlog /var/log/authlog.0.gz
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EOF
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mv /tmp/doas.conf /etc/doas.conf
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cat > /var/cron/tabs/_pfbadhost <<EOF
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# (Cron version V5.0)
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~ 0~1 * * * -s pf-badhost -O openbsd
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EOF
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chown _pfbadhost:crontab /var/cron/tabs/_pfbadhost
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chmod 600 /var/cron/tabs/_pfbadhost
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}
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set_basic_configuration(){
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cat > my_configuration/pf.conf <<EOF
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#Filtres badhosts et sshguard
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table <pfbadhost> persist file "/etc/pf-badhost.txt"
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table <sshguard> persist
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## Table pour les batards de bruteforceurs
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table <bruteforce> persist
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set block-policy drop # bloque silencieusement
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set skip on lo # En local on s'en fou on surveille rien
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set limit table-entries 400000
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set limit states 100000
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## Traitement des paquets ##
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# Paquets partiels on vire
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match all scrub (max-mss 1440 no-df random-id reassemble tcp)
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antispoof quick for egress # Protection vol d'ip
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antispoof quick for lo0 # Protection vol d'ip
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# Port build user does not need network
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block return out log proto {tcp udp} user _pbuild
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# On bloque tout par défault
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block
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block quick on egress from <pfbadhost>
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block in from <sshguard>
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block log quick from <bruteforce> label "brutes"
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pass out on egress proto { tcp udp icmp ipv6-icmp } modulate state
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EOF
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}
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set_open_service(){
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cat >> my_configuration/pf.conf <<EOF
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#déclaration des variables
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web_ports = "{ http https }"
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EOF
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if [ "$SERVICE_MAIL" == "yes" ]; then
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echo "mail_ports = \"{ smtp submission imap }\"" >> default_configuration/pf.conf
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fi
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if [ "$SERVICE_XMPP" == "yes" ]; then
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echo "xmmp_ports = \"{ 5222 5269 }\"" >> default_configuration/pf.conf
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fi
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echo "ssh_port = \"$SSH_PORT\"" >> default_configuration/pf.conf
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cat >> my_configuration/pf.conf <<EOF
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## Anti bruteforce
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### SSH
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#### Limit 5 connexions simultanne par IP source
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#### Limit 15 tentatives de connexion toutes les 5 minutes
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pass in on egress proto tcp to port \$ssh_port modulate state \\
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(max-src-conn 5, max-src-conn-rate 15/5, overload <bruteforce> flush global)
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#web
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pass in on egress proto tcp to port \$web_ports modulate state \\
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(max-src-conn 60, max-src-conn-rate 60/1, overload <bruteforce> flush global)
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EOF
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if [ "$SERVICE_MAIL" == "yes" ]; then
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cat >> my_configuration/pf.conf <<EOF
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# mails
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## antispam
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pass in on egress proto tcp to port \$mail_ports modulate state \\
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(max-src-conn-rate 20/5, overload <bruteforce> flush global)
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pass out log on egress proto tcp to any port smtp
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EOF
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fi
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if [ "$SERVICE_XMPP" == "yes" ]; then
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cat >> my_configuration/pf.conf <<EOF
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# XMPP
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pass in on egress proto tcp to port \$xmpp_ports modulate state \\
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(max-src-conn 15, max-src-conn-rate 15/5, overload <bruteforce> flush global)
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EOF
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fi
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}
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install_pf_and_enable(){
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pfctl -nf my_configuration/pf.conf
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if [ $? == 0 ]; then
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cp -v /etc/pf.conf /etc/pf.old
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cp -v my_configuration/pf.conf /etc/pf.conf
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pfctl -f /etc/pf.conf
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else
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echo "Il y a un problème dans la configuration du firewall"
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fi
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}
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set_basic_configuration
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set_open_service
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