Bug fixes

[hcoop/zz_old/fwtool.git] / closed.conf

option clearall
option createchains
option automod

############# Define variables
def $IFCONFIG = "/sbin/ifconfig";
def $AWK      = "/usr/bin/awk";
def $GREP     = "/bin/grep";
def $CAT      = "/bin/cat";
def $SED      = "/bin/sed";

def $MASK     = 29;  # Our netmask is /29 = 255.255.255.248
def $IPS      = 64.20.38.170;
def $IFS      = eth0;
def $IPSPEC   = "64.20.38.170/$MASK";
def $WE       = (127.0.0.1/8 $IPSPEC);

def $NSIP     = `/bin/cat /etc/resolv.conf | /bin/grep nameserver | /usr/bin/awk '{print $2}'`;
#set NTPIP	   `$CAT /etc/ntp.conf | $GREP server | $AWK '{print $2}'`

def $BADGUYS  = `/etc/firewall/print_badguys`;

############# Port/protocol combinations we allow in and out
def $TCP_IN              = (ssh smtp 26 auth www ssmtp https imap imaps pop3 pop3s 10000 20000);
# 10000 is webmin; 20000 is usermin
def $TCP_OUT_DELAY       = (ssh ftp auth);
def $TCP_OUT_RELIABILITY = (http nntp smtp pop3 auth domain);
def $TCP_OUT_THROUGHPUT  = (ftp-data);
#set TCP_OUT_COST	   ""

def $UDP_IN              = (ntp domain);
def $UDP_OUT             = 1:65535;

def $ICMP_IN             = (ping pong destination-unreachable source-quench time-exceeded parameter-problem);
def $ICMP_OUT            = (ping pong fragmentation-needed source-quench parameter-problem);


# Make us insensitive to the environment
table mangle chain FORWARD policy DROP;
table filter chain FORWARD policy DROP;
table filter chain (INPUT OUTPUT) policy DROP;

# Allow traffic in areas outside of our scope
table mangle chain (PREROUTING INPUT OUTPUT POSTROUTING) policy ACCEPT;
table nat    chain (PREROUTING OUTPUT POSTROUTING) policy ACCEPT;

######################################################################
# Built-in chains that jump to our custom ones

chain INPUT {
	state INVALID goto ldrop;
	fragment goto ldrop;
#	goto IANA_BAN;
#	goto LOCAL_BAN;
	#goto PORTSCAN; # Do we need this? There are better, dedicated tools

	state (ESTABLISHED RELATED) ACCEPT;

	proto tcp if lo saddr 127.0.0.1/8 sport :1023 daddr 127.0.0.1/8 ACCEPT;
	proto tcp if lo saddr 127.0.0.1/8 daddr 127.0.0.1/8 dport :1023 ACCEPT;
	proto (tcp udp) saddr 127.0.0.1/8 daddr 127.0.0.1/8 mod owner uid-owner 0 ACCEPT;
	if lo saddr $IPSPEC     daddr $IPSPEC     ACCEPT;
#	if lo goto ldrop;

	#incoming traffic
	goto badguys;
	protocol tcp goto fw_tcp;
	protocol udp goto fw_udp;
	protocol icmp goto fw_icmp;

	goto ldrop;
}

chain OUTPUT {
	state INVALID goto lreject;
	fragment goto lreject;

	state (ESTABLISHED RELATED) ACCEPT;

	proto tcp of lo saddr 127.0.0.1/8 daddr 127.0.0.1/8 ACCEPT;
	saddr 127.0.0.1/8 daddr 127.0.0.1/8 mod owner uid-owner 0 ACCEPT;
	of lo saddr $IPSPEC                       ACCEPT;
#	of lo goto lreject;

	# queueing goes here, maybe some special fw rules as well
	proto tcp goto tosqueue; # ACCEPT must be handled here

	proto udp dport $UDP_OUT ACCEPT;
	proto icmp icmp-type $ICMP_OUT ACCEPT;

	goto lreject;
}

#####################################################################
# Deal with known offenders right away
# Make difference between notorious ones and unusual ones
chain badguys {
	saddr $BADGUYS REJECT;
}

#####################################################################
# TCP traffic
chain fw_tcp proto tcp {
	# Standard allowances
	syn dport $TCP_IN sport 1024: {
		limit 5/s ACCEPT;
		limit 20/m LOG log-prefix "SYN flood attack:";
		goto ldrop;
	}

	# deny scanning via DNS port
	sport domain {
		dport domain ACCEPT;
		syn goto ldrop;
	}

	# special case to allow active ftp transfers to our machine!
	sport ftp-data dport 1024: {
		ACCEPT;
	}

	include 'users_tcp_in.conf';

	# awkward incoming connections
	syn {
		goto ldrop;
	}
}

#####################################################################
# UDP traffic
chain fw_udp proto udp {
	# Standard allowances
	dport $UDP_IN sport 1024: {
		ACCEPT;
	}

	# again no dns fumbling around
	sport domain dport domain saddr $NSIP {
		ACCEPT;
	}
}


#####################################################################
# ICMP traffic
chain fw_icmp proto icmp {
	# Standard allowances
	icmp-type $ICMP_IN {
		ACCEPT;
	}

	#icmp-type echo-request limit 1/s ACCEPT;
	#icmptype ( ping pong destination-unreachable time-exceeded) {
	#	ACCEPT;
	#}
	# never seen hits on this one:
}


#####################################################################
# TOS (Type-of-service) adjustments
chain tosqueue {
	protocol tcp {
		# rapid response protocols
#		dport $TCP_OUT_DELAY settos min-delay ACCEPT;
		dport $TCP_OUT_DELAY ACCEPT;
		sport $TCP_OUT_DELAY ACCEPT;
		# keep these from timing out
#		dport $TCP_OUT_RELIABILITY settos max-reliability ACCEPT;
		dport $TCP_OUT_RELIABILITY ACCEPT;
		sport $TCP_OUT_RELIABILITY ACCEPT;
		# bulk stuff
#		dport $TCP_OUT_THROUGHPUT settos max-throughput ACCEPT;
		dport $TCP_OUT_THROUGHPUT ACCEPT;
		sport $TCP_OUT_THROUGHPUT ACCEPT;
#    dport (ftp-data 8888 6699) settos max-throughput ACCEPT;
    dport (ftp-data 8888 6699) ACCEPT;
    sport (ftp-data 8888 6699) ACCEPT;
	}

#	proto tcp dport $TCP_OUT_COST settos min-cost ACCEPT;

	include 'users_tcp_out.conf';

	goto lreject;
}

#####################################################################
# Supporting targets
chain ldrop {
	LOG {
		log-level info log-prefix "Dropped";
		log-level warn fragment log-prefix "FRAGMENT Dropped";
	}
	REJECT;
}

chain lreject {
	LOG {
		log-level info proto tcp log-prefix "Denied";
		log-level warn fragment log-prefix "FRAGMENT Denied";
	}
	REJECT;
}

include 'users.conf';