# INSTALLATION
#
# # cp <script> /etc/init.d/nddconfig
# # chmod 744 /etc/init.d/nddconfig
# # chown root:sys /etc/init.d/nddconfig
# # ln /etc/init.d/nddconfig /etc/rc2.d/S70nddconfig
#
PATH=/usr/bin:/usr/sbin
#
# A note about parameter values:
# '0' == false/off/disable
# '1' == true/on/enable
#
#
# verbose
#
# This option enables verbose output generated by this script.
#
verbose=1
#
# arp_cleanup_interval
#
# This option determines the period of time the Address Resolution
# Protocol (ARP) cache maintains entries. ARP attacks may be effective
# with the default interval. Shortening the timeout interval should
# reduce the effectiveness of such an attack.
# The default value is 300000 milliseconds (5 minutes).
#
arp_cleanup_interval=60000
#
# ip_forward_directed_broadcasts
#
# This option determines whether to forward broadcast packets directed
# to a specific net or subnet, if that net or subnet is directly
# connected to the machine. If the system is acting as a router, this
# option can be exploited to generate a great deal of broadcast network
# traffic. Turning this option off will help prevent broadcast traffic
# attacks.
# The default value is 1 (true).
#
ip_forward_directed_broadcasts=0
#
# ip_forward_src_routed
# ip6_forward_src_routed (Solaris 8)
#
# This option determines whether to forward packets that are source
# routed. These packets define the path the packet should take instead
# of allowing network routers to define the path.
# The default value is 1 (true).
#
ip_forward_src_routed=0
ip6_forward_src_routed=0
#
# ip_ignore_redirect
# ip6_ignore_redirect (Solaris 8)
#
# This option determines whether to ignore Internet Control Message
# Protocol (ICMP) packets that define new routes. If the system is
# acting as a router, an attacker may send redirect messages to alter
# routing tables as part of sophisticated attack (man in the middle
# attack) or a simple denial of service.
# The default value is 0 (false).
#
ip_ignore_redirect=1
ip6_ignore_redirect=1
#
# ip_ire_flush_interval (Solaris 2.5.1, 2.6, and 7)
# ip_ire_arp_interval (Solaris 8)
#
# This option determines the period of time at which a specific route
# will be kept, even if currently in use. ARP attacks may be effective
# with the default interval. Shortening the time interval may reduce
# the effectiveness of attacks.
# The default interval is 1200000 milliseconds (20 minutes).
#
ip_ire_flush_interval=60000
ip_ire_arp_interval=60000
#
# ip_respond_to_address_mask_broadcast
#
# This options determines whether to respond to ICMP netmask requests
# which are typically sent by diskless clients when booting. An
# attacker may use the netmask information for determining network
# topology or the broadcast address for the subnet.
# The default value is 0 (false).
#
ip_respond_to_address_mask_broadcast=0
#
# ip_respond_to_echo_broadcast
# ip6_respond_to_echo_multicast (Solaris 8)
#
# This option determines whether to respond to ICMP broadcast echo
# requests (ping). An attacker may try to create a denial of service
# attack on subnets by sending many broadcast echo requests to which all
# systems will respond. This also provides information on systems that
# are available on the network.
# The default value is 1 (true).
#
ip_respond_to_echo_broadcast=0
ip6_respond_to_echo_multicast=0
#
# ip_respond_to_timestamp
#
# This option determines whether to respond to ICMP timestamp requests
# which some systems use to discover the time on a remote system. An
# attacker may use the time information to schedule an attack at a
# period of time when the system may run a cron job (or other time-
# based event) or otherwise be busy. It may also be possible predict
# ID or sequence numbers that are based on the time of day for spoofing
# services.
# The default value is 1 (true).
#
ip_respond_to_timestamp=0
#
# ip_respond_to_timestamp_broadcast
#
# This option determines whether to respond to ICMP broadcast timestamp
# requests which are used to discover the time on all systems in the
# broadcast range. This option is dangerous for the same reasons as
# responding to a single timestamp request. Additionally, an attacker
# may try to create a denial of service attack by generating many
# broadcast timestamp requests.
# The default value is 1 (true).
#
ip_respond_to_timestamp_broadcast=0
#
# ip_send_redirects
# ip6_send_redirects (Solaris 8)
#
# This option determines whether to send ICMP redirect messages which
# can introduce changes into remote system's routing table. It should
# only be used on systems that act as routers.
# The default value is 1 (true).
#
ip_send_redirects=0
ip6_send_redirects=0
#
# ip_strict_dst_multihoming
# ip6_strict_dst_multihoming (Solaris 8)
#
# This option determines whether to enable strict destination
# multihoming. If this is set to 1 and ip_forwarding is set to 0, then
# a packet sent to an interface from which it did not arrive will be
# dropped. This setting prevents an attacker from passing packets across
# a machine with multiple interfaces that is not acting a router.
# The default value is 0 (false).
#
ip_strict_dst_multihoming=1
ip6_strict_dst_multihoming=1
#
# tcp_conn_req_max_q0
#
# This option sets the size of the queue containing unestablished
# connections. This queue is part of a protection mechanism against
# SYN flood attacks. The queue size default is adequate for most
# systems but should be increased for busy servers.
# The default value is 1024.
#
tcp_conn_req_max_q0=4096
#
# tcp_conn_req_max_q
#
# This option sets the maximum number fully established connections.
# Increasing the size of this queue provides some limited protection
# against resource consumption attacks. The queue size default is
# adequate for most systems but should be increased for busy servers.
# The default value is 128.
#
tcp_conn_req_max_q=1024
#
# tcp_rev_src_routes (Solaris 8)
#
# This option determines whether the specified route in a source
# routed packet will be used in returned packets. TCP source routed
# packets may be used in spoofing attacks, so the reverse route should
# not be used.
# The default value is 0 (false).
#
tcp_rev_src_routes=0
#
# Adding specific privileged ports (Solaris 2.6, 7, and 8)
#
# These options define additional TCP and UDP privileged ports outside
# of the 1-1023 range. Any program that attempts to bind the ports
# listed here must run as root. This prevents normal users from
# starting server processes on specific ports. Multiple ports can be
# specifed by quoting and separating them with spaces.
#
# Defaults values:
# tcp_extra_priv_ports: 2049 (nfsd) 4045 (lockd)
# udp_extra_priv_ports: 2049 (nfsd) 4045 (lockd)
#
tcp_extra_priv_ports_add="6112"
udp_extra_priv_ports_add=""
#
# Ephemeral port range adjustment (Solaris 2.5.1, 2.6, 7, and 8)
#
# These options define the upper and lower bounds on ephemeral ports.
# Ephemeral (means short-lived) ports are used when establishing
# outbound network connections.
#
# Defaults values:
# tcp_smallest_anon_port=32768
# tcp_largest_anon_port=65535
# udp_smallest_anon_port=32768
# udp_largest_anon_port=65535
#
tcp_smallest_anon_port=32768
tcp_largest_anon_port=65535
udp_smallest_anon_port=32768
udp_largest_anon_port=65535
#
# Nonprivileged port range adjustment (Solaris 2.5.1, 2.6, 7, and 8)
#
# These options define the start of nonprivileged TCP and UDP ports.
# The nonprivileged port range normally starts at 1024. Any program
# that attempts to bind a nonprivileged port does not have to run as
# root.
#
# Defaults values:
# tcp_smallest_nonpriv_port=1024
# udp_smallest_nonpriv_port=1024
#
tcp_smallest_nonpriv_port=1024
udp_smallest_nonpriv_port=1024
# +-----------------------------------------+
# | No modification needed below this line. |
# +-----------------------------------------+
#
# base parameters (the same across the 2.5.1, 2.6, 7, 8, and 9 (alpha)
# releases)
#
base_parameters="arp_cleanup_interval
ip_forward_directed_broadcasts
ip_forward_src_routed
ip_ignore_redirect
ip_respond_to_address_mask_broadcast
ip_respond_to_echo_broadcast
ip_respond_to_timestamp
ip_respond_to_timestamp_broadcast
ip_send_redirects
ip_strict_dst_multihoming
tcp_conn_req_max_q0
tcp_conn_req_max_q
tcp_smallest_anon_port
tcp_largest_anon_port
udp_smallest_anon_port
udp_largest_anon_port
tcp_smallest_nonpriv_port
udp_smallest_nonpriv_port"
#
# OS_revision specific parameters
#
# Solaris 2.5.1 specific parameters
SunOS5_5_1="ip_ire_flush_interval"
# Solaris 2.6 specific parameters
SunOS5_6="ip_ire_flush_interval
tcp_extra_priv_ports_add
udp_extra_priv_ports_add"
# Solaris 7 specific parameters
SunOS5_7="ip_ire_flush_interval
tcp_extra_priv_ports_add
udp_extra_priv_ports_add"
# Solaris 8 specific parameters
SunOS5_8="ip_ire_arp_interval
tcp_extra_priv_ports_add
udp_extra_priv_ports_add
tcp_rev_src_routes"
# Solaris 9 (alpha) specific parameters
SunOS5_9="ip_ire_arp_interval
tcp_extra_priv_ports_add
udp_extra_priv_ports_add
tcp_rev_src_routes"
#
# IPv6 parameters (apply to Solaris 8 and 9 (alpha))
#
ip6_parameters="ip6_forward_src_routed
ip6_respond_to_echo_multicast
ip6_send_redirects
ip6_ignore_redirect
ip6_strict_dst_multihoming"
#
# system privilege ports defaults
#
extra_priv_ports_defaults="2049 4045 "
#
# get OS name and revision information
#
os=`uname -s`
revision=`uname -r`
OSRev=$os`echo $revision | sed -e 's/./_/g'`
#
# check if IPv6 is enabled
#
ip6_interfaces="`echo /etc/hostname6.*[0-9] 2> /dev/null`"
[ "$ip6_interfaces" != "/etc/hostname6.*[0-9]" ] && ip6_enabled=true
#
# do_in_order -- This function executes the specified functions with
# the appropriate parameters for the local OS, revision, and
# configuration. Currently it acts on a specific base set of
# parameters, OS and revision specific parameters, and IPv6
# parameters.
#
do_in_order() { # function_name
function_name=$1
# handle the base parameters
for param in $base_parameters; do
$function_name $param
done
# handle the OS/revision specific parameters
eval OSRev_params=$$OSRev
for param in $OSRev_params; do
$function_name $param
done
# handle IPv6 parameters
if [ "$ip6_enabled" = "true" ]; then
for param in $ip6_parameters; do
$function_name $param
done
fi
}
#
# set_parameter -- This function uses ndd to set a parameter.
# The supplied parameter name has a shell variable with the same
# name which contains the value for the parameter.
#
set_parameter() { # parameter
# definition for local variable
param=$1
# determine the driver from the first substring in the parameter name
driver=/dev/`echo $param | sed -e 's/_.*//'`
eval values=$$param
# First check that a value for the parameter exists. If not, skip it.
if [ -n "$values" ]; then
# Some parameters may have multiple values specified in one
# assignment further up in the script. ndd only accepts one
# parameter at a time. Loop through and set each value.
for value in $values; do
[ "$verbose" = "1" ] &&
echo "Setting $driver $param to $value"
ndd -set $driver $param $value
done
fi
}
#
# display_parameter -- This function uses ndd to extract the value of
# a parameter and display it.
#
display_parameter() { # parameter
# definition for local variable
param=$1
# hack for the "write only" extra privileged ports parameters
param=`echo $param | sed -e 's/_add$//'`
# determine the driver from the first substring in the parameter name
driver=/dev/`echo $param | sed -e 's/_.*//'`
# execute the ndd command to retrieve settings and remove newlines
value=`ndd $driver $param | tr -d 'n'`
# print parameter value
echo " $driver $param = '$value'"
}
#
# compare_parameter -- This function uses ndd to extract the value of
# a parameter. It compares the current parameter value to the one
# defined in this script.
#
compare_parameter() { # parameter
# definition for local variable
originalParam=$1
# hack for the "write only" extra privileged ports parameters
modifiedParam=`echo $originalParam | sed -e 's/_add$//'`
# determine the driver from the first substring in the parameter name
driver=/dev/`echo $modifiedParam | sed -e 's/_.*//'`
# execute the ndd command to retrieve settings and remove newlines
currentValue=`ndd $driver $modifiedParam | tr -d 'n'`
eval intendedValue="$$originalParam"
# if the modified parameter name is different from the original
# parameter, then we are dealing with the privileged port parameters
if [ "$modifiedParam" != "$originalParam" ]; then
# the privileged port parameters have system defaults that must
# be accounted for in the comparison
if [ -n "$intendedValue" ]; then
intendedValue="$extra_priv_ports_defaults$intendedValue "
else
intendedValue="$extra_priv_ports_defaults"
fi
fi
# print parameter value and note all deviations
echo " $driver $modifiedParam = '$currentValue'c"
if [ "$intendedValue" != "$currentValue" ]; then
echo " (should be '$intendedValue')"
else
echo " (ok)"
fi
}
# Process the command argument
case "$1" in
'start')
# set the parameters in the defined order
do_in_order set_parameter
;;
'show')
echo "Current ndd parameter settings:"
do_in_order display_parameter
;;
'compare')
echo "Comparison of ndd parameter settings:"
do_in_order compare_parameter
;;
'stop')
# ignored
[ "$verbose" = "1" ] &&
echo "$0: 'stop' ignored. No network changes applied."
;;
*)
echo "Usage: $0 { start | stop | show | compare }"
exit 1
;;
esac
exit 0
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