WolfEric
23.06.06, 16:49
Hallo,
beim starten des firewall-scripts passiert folgendes:
bash-3.00# /etc/rc.d/rc.firewall start
Starte IP-Paketfilter
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `nat': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `mangle': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `nat': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `mangle': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
bash-3.00#
Er findet offenbar das Modul ip_tables nicht. Jetzt habe ich mir grade mal meine Kernel Config (2.6.16.18) angeschaut und nach dem Modul ip_tables gesucht, aber keines gefunden. Kann mir jemand sagen, wo genau das sein soll - in der Section Network habe ich keinen Eintrag gefunden.
Vielleicht bin ich auch einfach nur zu blind.
Das Script für die Firewall lieferte mir Harrys Firewall Generator (genauen Namen habe ich jetzt nicht im Kopf, aber der ist ja bekannt).
Hier das Script falls von Belang:
bash-3.00$ cat /etc/rc.d/rc.firewall
#!/bin/bash
# ---------------------------------------------------------------------
# Linux-iptables-Firewallskript, Copyright (c) 2006 under the GPL
# Autogenerated by iptables Generator v1.20 (c) 2002-2005 by Harald Bertram
# Please visit http://www.harry.homelinux.org for new versions of
# the iptables Generator (c).
#
# This Script was generated by request from:
# xxx@xxx on: 2006-4-2 20:18.35 MET.
#
# If you have questions about the iptables Generator or about
# your Firewall-Skript feel free to take a look at out website or
# send me an E-Mail to webmaster@harry.homelinux.org.
#
# My special thanks are going to Lutz Heinrich (trinitywork at hotmail dot com)
# who made lots of Beta-Testing and gave me lots of well qualified
# Feedback that made me able to improve the iptables Generator.
# --------------------------------------------------------------------
#
### BEGIN INIT INFO
# Provides: IP-Paketfilter
# Required-Start: $network $local_fs
# Required-Stop: $local_fs
# Default-Start: 3 5
# Default-Stop: 0 1 2 4 6
# Short-Description: Harry's IP-Paketfilter
# Description: Harry's IP-Paketfilter provides reasonable
# IP-Security for Home-Computers and small networks
### END INIT INFO
#
case "$1" in
start)
echo "Starte IP-Paketfilter"
# iptables-Modul
# modprobe ip_tables
# Connection-Tracking-Module
modprobe ip_conntrack
# Das Modul ip_conntrack_irc ist erst bei Kerneln >= 2.4.19 verfuegbar
modprobe ip_conntrack_irc
modprobe ip_conntrack_ftp
# Tabelle flushen
iptables -F
iptables -t nat -F
iptables -t mangle -F
iptables -X
iptables -t nat -X
iptables -t mangle -X
# Default-Policies setzen
iptables -P INPUT DROP
iptables -P OUTPUT DROP
iptables -P FORWARD DROP
# MY_REJECT-Chain
iptables -N MY_REJECT
# MY_REJECT fuellen
iptables -A MY_REJECT -p tcp -m limit --limit 7200/h -j LOG --log-prefix "REJECT TCP "
iptables -A MY_REJECT -p tcp -j REJECT --reject-with tcp-reset
iptables -A MY_REJECT -p udp -m limit --limit 7200/h -j LOG --log-prefix "REJECT UDP "
iptables -A MY_REJECT -p udp -j REJECT --reject-with icmp-port-unreachable
iptables -A MY_REJECT -p icmp -m limit --limit 7200/h -j LOG --log-prefix "DROP ICMP "
iptables -A MY_REJECT -p icmp -j DROP
iptables -A MY_REJECT -m limit --limit 7200/h -j LOG --log-prefix "REJECT OTHER "
iptables -A MY_REJECT -j REJECT --reject-with icmp-proto-unreachable
# MY_DROP-Chain
iptables -N MY_DROP
iptables -A MY_DROP -m limit --limit 7200/h -j LOG --log-prefix "PORTSCAN DROP "
iptables -A MY_DROP -j DROP
# Alle verworfenen Pakete protokollieren
iptables -A INPUT -m state --state INVALID -m limit --limit 7200/h -j LOG --log-prefix "INPUT INVALID "
iptables -A OUTPUT -m state --state INVALID -m limit --limit 7200/h -j LOG --log-prefix "OUTPUT INVALID "
# Korrupte Pakete zurueckweisen
iptables -A INPUT -m state --state INVALID -j DROP
iptables -A OUTPUT -m state --state INVALID -j DROP
# Stealth Scans etc. DROPpen
# Keine Flags gesetzt
iptables -A INPUT -p tcp --tcp-flags ALL NONE -j MY_DROP
# SYN und FIN gesetzt
iptables -A INPUT -p tcp --tcp-flags SYN,FIN SYN,FIN -j MY_DROP
# SYN und RST gleichzeitig gesetzt
iptables -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j MY_DROP
# FIN und RST gleichzeitig gesetzt
iptables -A INPUT -p tcp --tcp-flags FIN,RST FIN,RST -j MY_DROP
# FIN ohne ACK
iptables -A INPUT -p tcp --tcp-flags ACK,FIN FIN -j MY_DROP
# PSH ohne ACK
iptables -A INPUT -p tcp --tcp-flags ACK,PSH PSH -j MY_DROP
# URG ohne ACK
iptables -A INPUT -p tcp --tcp-flags ACK,URG URG -j MY_DROP
# Loopback-Netzwerk-Kommunikation zulassen
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT
# Connection-Tracking aktivieren
iptables -A OUTPUT -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
# Default-Policies mit REJECT
iptables -A INPUT -j MY_REJECT
iptables -A OUTPUT -j MY_REJECT
# Max. 500/Sekunde (5/Jiffie) senden
echo 5 > /proc/sys/net/ipv4/icmp_ratelimit
# Speicherallozierung und -timing für IP-De/-Fragmentierung
echo 262144 > /proc/sys/net/ipv4/ipfrag_high_thresh
echo 196608 > /proc/sys/net/ipv4/ipfrag_low_thresh
echo 30 > /proc/sys/net/ipv4/ipfrag_time
# TCP-FIN-Timeout zum Schutz vor DoS-Attacken setzen
echo 30 > /proc/sys/net/ipv4/tcp_fin_timeout
# Maximal 3 Antworten auf ein TCP-SYN
echo 3 > /proc/sys/net/ipv4/tcp_retries1
# TCP-Pakete maximal 15x wiederholen
echo 15 > /proc/sys/net/ipv4/tcp_retries2
;;
stop)
echo "Stoppe IP-Paketfilter"
# Tabelle flushen
iptables -F
iptables -t nat -F
iptables -t mangle -F
iptables -X
iptables -t nat -X
iptables -t mangle -X
# Default-Policies setzen
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT
;;
status)
echo "Tabelle filter"
iptables -L -vn
echo "Tabelle nat"
iptables -t nat -L -vn
echo "Tabelle mangle"
iptables -t mangle -L -vn
;;
*)
echo "Fehlerhafter Aufruf"
echo "Syntax: $0 {start|stop|status}"
exit 1
;;
esac
bash-3.00$
Für einen Tipp wäre ich dankbar.
iptables ist in Version 1.3.3 installiert (das in Slackware 10.2 mitgelieferte)
WolfEric
beim starten des firewall-scripts passiert folgendes:
bash-3.00# /etc/rc.d/rc.firewall start
Starte IP-Paketfilter
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `nat': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `mangle': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `nat': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `mangle': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
FATAL: Module ip_tables not found.
iptables v1.3.3: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
bash-3.00#
Er findet offenbar das Modul ip_tables nicht. Jetzt habe ich mir grade mal meine Kernel Config (2.6.16.18) angeschaut und nach dem Modul ip_tables gesucht, aber keines gefunden. Kann mir jemand sagen, wo genau das sein soll - in der Section Network habe ich keinen Eintrag gefunden.
Vielleicht bin ich auch einfach nur zu blind.
Das Script für die Firewall lieferte mir Harrys Firewall Generator (genauen Namen habe ich jetzt nicht im Kopf, aber der ist ja bekannt).
Hier das Script falls von Belang:
bash-3.00$ cat /etc/rc.d/rc.firewall
#!/bin/bash
# ---------------------------------------------------------------------
# Linux-iptables-Firewallskript, Copyright (c) 2006 under the GPL
# Autogenerated by iptables Generator v1.20 (c) 2002-2005 by Harald Bertram
# Please visit http://www.harry.homelinux.org for new versions of
# the iptables Generator (c).
#
# This Script was generated by request from:
# xxx@xxx on: 2006-4-2 20:18.35 MET.
#
# If you have questions about the iptables Generator or about
# your Firewall-Skript feel free to take a look at out website or
# send me an E-Mail to webmaster@harry.homelinux.org.
#
# My special thanks are going to Lutz Heinrich (trinitywork at hotmail dot com)
# who made lots of Beta-Testing and gave me lots of well qualified
# Feedback that made me able to improve the iptables Generator.
# --------------------------------------------------------------------
#
### BEGIN INIT INFO
# Provides: IP-Paketfilter
# Required-Start: $network $local_fs
# Required-Stop: $local_fs
# Default-Start: 3 5
# Default-Stop: 0 1 2 4 6
# Short-Description: Harry's IP-Paketfilter
# Description: Harry's IP-Paketfilter provides reasonable
# IP-Security for Home-Computers and small networks
### END INIT INFO
#
case "$1" in
start)
echo "Starte IP-Paketfilter"
# iptables-Modul
# modprobe ip_tables
# Connection-Tracking-Module
modprobe ip_conntrack
# Das Modul ip_conntrack_irc ist erst bei Kerneln >= 2.4.19 verfuegbar
modprobe ip_conntrack_irc
modprobe ip_conntrack_ftp
# Tabelle flushen
iptables -F
iptables -t nat -F
iptables -t mangle -F
iptables -X
iptables -t nat -X
iptables -t mangle -X
# Default-Policies setzen
iptables -P INPUT DROP
iptables -P OUTPUT DROP
iptables -P FORWARD DROP
# MY_REJECT-Chain
iptables -N MY_REJECT
# MY_REJECT fuellen
iptables -A MY_REJECT -p tcp -m limit --limit 7200/h -j LOG --log-prefix "REJECT TCP "
iptables -A MY_REJECT -p tcp -j REJECT --reject-with tcp-reset
iptables -A MY_REJECT -p udp -m limit --limit 7200/h -j LOG --log-prefix "REJECT UDP "
iptables -A MY_REJECT -p udp -j REJECT --reject-with icmp-port-unreachable
iptables -A MY_REJECT -p icmp -m limit --limit 7200/h -j LOG --log-prefix "DROP ICMP "
iptables -A MY_REJECT -p icmp -j DROP
iptables -A MY_REJECT -m limit --limit 7200/h -j LOG --log-prefix "REJECT OTHER "
iptables -A MY_REJECT -j REJECT --reject-with icmp-proto-unreachable
# MY_DROP-Chain
iptables -N MY_DROP
iptables -A MY_DROP -m limit --limit 7200/h -j LOG --log-prefix "PORTSCAN DROP "
iptables -A MY_DROP -j DROP
# Alle verworfenen Pakete protokollieren
iptables -A INPUT -m state --state INVALID -m limit --limit 7200/h -j LOG --log-prefix "INPUT INVALID "
iptables -A OUTPUT -m state --state INVALID -m limit --limit 7200/h -j LOG --log-prefix "OUTPUT INVALID "
# Korrupte Pakete zurueckweisen
iptables -A INPUT -m state --state INVALID -j DROP
iptables -A OUTPUT -m state --state INVALID -j DROP
# Stealth Scans etc. DROPpen
# Keine Flags gesetzt
iptables -A INPUT -p tcp --tcp-flags ALL NONE -j MY_DROP
# SYN und FIN gesetzt
iptables -A INPUT -p tcp --tcp-flags SYN,FIN SYN,FIN -j MY_DROP
# SYN und RST gleichzeitig gesetzt
iptables -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j MY_DROP
# FIN und RST gleichzeitig gesetzt
iptables -A INPUT -p tcp --tcp-flags FIN,RST FIN,RST -j MY_DROP
# FIN ohne ACK
iptables -A INPUT -p tcp --tcp-flags ACK,FIN FIN -j MY_DROP
# PSH ohne ACK
iptables -A INPUT -p tcp --tcp-flags ACK,PSH PSH -j MY_DROP
# URG ohne ACK
iptables -A INPUT -p tcp --tcp-flags ACK,URG URG -j MY_DROP
# Loopback-Netzwerk-Kommunikation zulassen
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT
# Connection-Tracking aktivieren
iptables -A OUTPUT -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
# Default-Policies mit REJECT
iptables -A INPUT -j MY_REJECT
iptables -A OUTPUT -j MY_REJECT
# Max. 500/Sekunde (5/Jiffie) senden
echo 5 > /proc/sys/net/ipv4/icmp_ratelimit
# Speicherallozierung und -timing für IP-De/-Fragmentierung
echo 262144 > /proc/sys/net/ipv4/ipfrag_high_thresh
echo 196608 > /proc/sys/net/ipv4/ipfrag_low_thresh
echo 30 > /proc/sys/net/ipv4/ipfrag_time
# TCP-FIN-Timeout zum Schutz vor DoS-Attacken setzen
echo 30 > /proc/sys/net/ipv4/tcp_fin_timeout
# Maximal 3 Antworten auf ein TCP-SYN
echo 3 > /proc/sys/net/ipv4/tcp_retries1
# TCP-Pakete maximal 15x wiederholen
echo 15 > /proc/sys/net/ipv4/tcp_retries2
;;
stop)
echo "Stoppe IP-Paketfilter"
# Tabelle flushen
iptables -F
iptables -t nat -F
iptables -t mangle -F
iptables -X
iptables -t nat -X
iptables -t mangle -X
# Default-Policies setzen
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT
;;
status)
echo "Tabelle filter"
iptables -L -vn
echo "Tabelle nat"
iptables -t nat -L -vn
echo "Tabelle mangle"
iptables -t mangle -L -vn
;;
*)
echo "Fehlerhafter Aufruf"
echo "Syntax: $0 {start|stop|status}"
exit 1
;;
esac
bash-3.00$
Für einen Tipp wäre ich dankbar.
iptables ist in Version 1.3.3 installiert (das in Slackware 10.2 mitgelieferte)
WolfEric