Raspberry Pi + Owncloud + Iptables

J'ai un Raspberry Pi que j'utilise pour stocker mes fichiers privés dans un nuage (comme Dropbox).

J'ai utilisé l'ensemble de ce tutoriel pour configurer le Pi https://www.pestmeester.nl/

les tables Ip ont été configurées conformément au tutoriel :

*filter 
#  Allow all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0
-A INPUT -i lo -j ACCEPT
-A INPUT -d 127.0.0.0/8 -j REJECT

#  Accept all established inbound connections
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
#  Allow all outbound traffic - you can modify this to only allow certain traffic
-A OUTPUT -j ACCEPT

#  Allow HTTP and HTTPS connections from anywhere (the normal ports for websites and SSL).
-A INPUT -p tcp --dport 80 -j ACCEPT
-A INPUT -p tcp --dport 443 -j ACCEPT

# Allows SMTP access
-A INPUT -p tcp --dport 25 -j ACCEPT
-A INPUT -p tcp --dport 465 -j ACCEPT
-A INPUT -p tcp --dport 587 -j ACCEPT

# Allows pop and pops connections
# -A INPUT -p tcp --dport 110 -j ACCEPT
# -A INPUT -p tcp --dport 995 -j ACCEPT

# Allows imap and imaps connections
-A INPUT -p tcp --dport 143 -j ACCEPT
-A INPUT -p tcp --dport 993 -j ACCEPT

#  Allow SSH connections
#  The -dport number should be the same port number you set in     sshd_config
-A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT

#  Allow ping
-A INPUT -p icmp --icmp-type echo-request -j ACCEPT

#  Log iptables denied calls
-A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7

#  Drop all other inbound - default deny unless explicitly allowed policy
-A INPUT -j DROP
-A FORWARD -j DROP

COMMIT

I Chaîne INPUT (politique ACCEPT) target prot opt source destination fail2ban-ssh tcp -- n'importe où n'importe où ACCEPT tous -- n'importe où n'importe où REJECT all -- anywhere loopback/8 reject-with icmp-port-unreachable ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED ACCEPT tcp -- anywhere anywhere anywhere ACCEPT tcp -- anywhere anywhere tcp dpt:https ACCEPT tcp -- anywhere anywhere tcp dpt:smtp ACCEPT tcp -- anywhere anywhere tcp dpt:urd ACCEPT tcp -- anywhere anywhere tcp dpt:submission ACCEPT tcp -- anywhere anywhere tcp dpt:imap2 ACCEPT tcp -- anywhere anywhere tcp dpt:imaps ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ssh ACCEPT icmp -- n'importe où n'importe où icmp echo-request LOG all -- anywhere anywhere limit : avg 5/min burst 5 LOG level debug prefix "iptables denied : [ ] DROP tous -- n'importe où n'importe où

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
DROP       all  --  anywhere             anywhere

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere

Chain fail2ban-ssh (1 references)
target     prot opt source               destination
RETURN     all  --  anywhere             anywhere

et iptables-save

# Generated by iptables-save v1.4.21 on Fri Jun 30 12:43:24 2017
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:fail2ban-ssh - [0:0]
-A INPUT -p tcp -m multiport --dports 22 -j fail2ban-ssh
-A INPUT -i lo -j ACCEPT
-A INPUT -d 127.0.0.0/8 -j REJECT --reject-with icmp-port-unreachable
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 443 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 25 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 465 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 587 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 143 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 993 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT
-A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: "                     --log-level 7
-A INPUT -j DROP
-A FORWARD -j DROP
-A OUTPUT -j ACCEPT
-A fail2ban-ssh -j RETURN
COMMIT

J'en viens maintenant à mon problème : dans le syslog, j'ai beaucoup d'entrées de ce type : Jun 30 12:00:46 raspberrypi kernel: [6978137.058941] iptables denied: IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:c8:1f:66:21:0d:62:08:00:45:00:01:9b:16:66:00:00:80:11:af:dc SRC=192.168.178.103 DST=255.255.255.255 LEN=411 TOS=0x00 PREC=0x00 TTL=128 ID=5734 PROTO=UDP SPT=17500 DPT=17500 LEN=391 Jun 30 12:01:10 raspberrypi kernel: [6978160.864968] iptables denied: IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:00:19:99:b5:ec:e0:08:00:45:00:01:9b:47:8b:00:00:80:11:7f:06 SRC=192.168.178.24 DST=255.255.255.255 LEN=411 TOS=0x00 PREC=0x00 TTL=128 ID=18315 PROTO=UDP SPT=17500 DPT=17500 LEN=391 Jun 30 12:01:10 raspberrypi kernel: [6978160.865463] iptables denied: IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:00:19:99:b5:ec:e0:08:00:45:00:01:9b:6f:9b:00:00:80:11:e3:4d SRC=192.168.178.24 DST=192.168.178.255 LEN=411 TOS=0x00 PREC=0x00 TTL=128 ID=28571 PROTO=UDP SPT=17500 DPT=17500 LEN=391 Jun 30 12:01:40 raspberrypi kernel: [6978190.866330] iptables denied: IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:00:19:99:b5:ec:e0:08:00:45:00:01:9b:47:8c:00:00:80:11:7f:05 SRC=192.168.178.24 DST=255.255.255.255 LEN=411 TOS=0x00 PREC=0x00 TTL=128 ID=18316 PROTO=UDP SPT=17500 DPT=17500 LEN=391 Jun 30 12:01:40 raspberrypi kernel: [6978190.866884] iptables denied: IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:00:19:99:b5:ec:e0:08:00:45:00:01:9b:6f:ae:00:00:80:11:e3:3a SRC=192.168.178.24 DST=192.168.178.255 LEN=411 TOS=0x00 PREC=0x00 TTL=128 ID=28590 PROTO=UDP SPT=17500 DPT=17500 LEN=391 Jun 30 12:01:46 raspberrypi kernel: [6978197.138692] iptables denied: IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:c8:1f:66:21:0d:62:08:00:45:00:01:9b:16:6e:00:00:80:11:af:d4 SRC=192.168.178.103 DST=255.255.255.255 LEN=411 TOS=0x00 PREC=0x00 TTL=128 ID=5742 PROTO=UDP SPT=17500 DPT=17500 LEN=391 Jun 30 12:02:10 raspberrypi kernel: [6978220.883154] iptables denied: IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:00:19:99:b5:ec:e0:08:00:45:00:01:9b:47:8d:00:00:80:11:7f:04 SRC=192.168.178.24 DST=255.255.255.255 LEN=411 TOS=0x00 PREC=0x00 TTL=128 ID=18317 PROTO=UDP SPT=17500 DPT=17500 LEN=391

de temps en temps le pi perd sa connexion et la seule chose qui rétablit la connexion est le redémarrage du superviseur de service Je ne sais pas si ces 2 problèmes sont liés l'un à l'autre. Comment faire pour configurer correctement les tables d'ip ? Avec un log avec autant d'entrées, je ne suis pas vraiment capable de détecter le problème qu'a owncloud.

J'espère vraiment que quelqu'un pourra m'aider.