* Predrag Punosevac <[email protected]> le [23-10-2016 20:18:27 -0400]:
> Op 23-10-2016 om 17:01 schreef Thuban:
> > Hi,
> > I have an openvpn server running and working, but can't
> > go "outside" the server to access the web.
> >
> > To configure the server, I followed this :
> > http://2f30.org/guides/openvpn.html
> >
> > So ip forwarding is ative, vpn port is open, clients can connect to
> the
> > vpn. But they can't access wwweb.
> >
> > I guess the problem comes from this pf rule :
> >
> > pass out on $ext_if from 10.8.0.0/24 to any nat-to ($ext_if)
> >
> > I've been on this issue for too many hours to have a clear mind on
> this.
> > Any advice to find why I'm stuck on the server?
> >
> > Regards.
> >
> >
>
> Hi,
>
> I saw your e-mail this morning but I had no idea what to make out of it
> as I am confused about your network topology. I was also not impressed
> that you were following some howto from the internet. Both PF and
> OpenVPN are well documented. Grab the books and read it.
>
The link to the howto was to avoid long explanations. Anyway, here is
some more information. I'm pretty sure I'm wrong to redirect packets.
What I want is this :
VPN
Clients -----> Server -----> Web
simply.
openvpn configuration :
dev tun0
server 10.8.0.0 255.255.255.0
push "dhcp-option DNS 80.67.169.12"
push "redirect-gateway def1"
ca /etc/openvpn/certs/ca.crt
cert /etc/openvpn/certs/server.crt
key /etc/openvpn/private/server.key
dh /etc/openvpn/dh.pem
crl-verify /etc/openvpn/crl.pem
daemon openvpn
group _openvpn
user _openvpn
keepalive 10 120
management 127.0.0.1 1195 /etc/openvpn/private/mgmt.pwd
max-clients 100
persist-key
persist-tun
port 1194
proto udp
comp-lzo
client-cert-not-required
username-as-common-name
script-security 3 system
auth-user-pass-verify /usr/local/libexec/openvpn_bsdauth via-env
auth-nocache
log-append /var/log/openvpn/openvpn.log
status /var/log/openvpn/openvpn-status.log
verb 3
/etc/pf.conf :
ext_if = "re0" # interface
ssh_port = "2222" # port ssh
http_ports = "{ www https }" # ports http(s)
mail_ports = "{ submission imaps }" # ports mails
tcp_pass = "{ gopher ipp 8000 }" # ports tcp
ouverts
udp_pass = "{ 1194 }" # ports udp ouverts
set block-policy drop # bloque
silencieusement
set skip on lo # Pas de filtre en
local
set limit table-entries 400000
## tables pour les vilains bruteforceurs
table <ssh_abuse> persist
table <http_abuse> persist
table <mail_abuse> persist
# antispam avec greylisting
table <spamd-white> persist
table <nospamd> persist file "/etc/mail/nospamd"
table <bgp-spamd-bypass> persist
## Traitement des paquets ##
match in all scrub (no-df) # Paquets
partiels
block in quick from urpf-failed
## Les règles du parefeu ##
# on bloque tout par défaut
block log all
# on bloque les ip blacklistées
block in log quick proto tcp from <http_abuse> to any port $http_ports
block in log quick proto tcp from <ssh_abuse> to any port $ssh_port
# antispam
pass in on $ext_if proto tcp from any to any port smtp \
divert-to 127.0.0.1 port spamd
pass in on $ext_if proto tcp from <nospamd> to any port smtp
pass in on $ext_if proto tcp from <spamd-white> to any port smtp
pass in quick on $ext_if proto tcp from <bgp-spamd-bypass> to any port
smtp
# Si + de 3 connections toutes les 60 secondes sur le port ssh
# on rajoute l'ip pour la bloquer.
pass in on $ext_if proto tcp to any port $ssh_port flags S/SA keep state
\
(max-src-conn-rate 5/60, overload <ssh_abuse> flush global)
# Si + de 50 connections toutes les 5 secondes sur les ports http(s)
# ou si elle essaie de se connecter + de 100 fois
# on rajoute l'ip pour la bloquer.
pass in on $ext_if proto tcp to any port $http_ports flags S/SA keep state
\
(max-src-conn-rate 50/5, overload <http_abuse> flush)
# Protection bruteforce pour les mails
pass in on $ext_if proto tcp to any port $mail_ports flags S/SA keep state
\
(max-src-conn-rate 10/60, overload <mail_abuse> flush global)
# on autorise le ping
pass quick inet6 proto ipv6-icmp all icmp6-type { echoreq, unreach
}
pass quick inet proto icmp all icmp-type { echoreq, unreach
}
# on ouvre les autres ports
pass in quick on $ext_if proto tcp to any port $tcp_pass keep state
pass in quick on $ext_if proto udp to any port $udp_pass keep state
# vpn
pass out on $ext_if from 10.8.0.0/24 to any nat-to ($ext_if)
# tout ouvert en sortie
pass out on $ext_if proto { tcp udp icmp } all modulate state
Regards.
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