forked from extern/shorewall_code
841 lines
18 KiB
Plaintext
841 lines
18 KiB
Plaintext
# This program is under GPL [http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt]
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#
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# (c) 1999-2011- Tom Eastep (teastep@shorewall.net)
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#
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# Options are:
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#
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# -n Don't alter Routing
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# -v and -q Standard Shorewall Verbosity control
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# -t Timestamp progress messages
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# -p Purge conntrack table
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# -r Recover from failed start/restart
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# -V <verbosity> Set verbosity level explicitly
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# -R <restore> Overrides RESTOREFILE setting
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#
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# Commands are:
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#
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# start Starts the firewall
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# refresh Refresh the firewall
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# restart Restarts the firewall
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# reload Reload the firewall
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# clear Removes all firewall rules
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# stop Stops the firewall
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# status Displays firewall status
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# version Displays the version of Shorewall that
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# generated this program
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#
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################################################################################
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# Functions imported from /usr/share/shorewall/prog.header6
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################################################################################
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#
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# Conditionally produce message
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#
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progress_message() # $* = Message
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{
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local timestamp
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timestamp=
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if [ $VERBOSITY -gt 1 ]; then
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[ -n "$g_timestamp" ] && timestamp="$(date +%H:%M:%S) "
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echo "${timestamp}$@"
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fi
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if [ $LOG_VERBOSITY -gt 1 ]; then
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timestamp="$(date +'%b %_d %T') "
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echo "${timestamp}$@" >> $STARTUP_LOG
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fi
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}
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progress_message2() # $* = Message
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{
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local timestamp
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timestamp=
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if [ $VERBOSITY -gt 0 ]; then
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[ -n "$g_timestamp" ] && timestamp="$(date +%H:%M:%S) "
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echo "${timestamp}$@"
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fi
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if [ $LOG_VERBOSITY -gt 0 ]; then
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timestamp="$(date +'%b %_d %T') "
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echo "${timestamp}$@" >> $STARTUP_LOG
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fi
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}
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progress_message3() # $* = Message
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{
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local timestamp
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timestamp=
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if [ $VERBOSITY -ge 0 ]; then
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[ -n "$g_timestamp" ] && timestamp="$(date +%H:%M:%S) "
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echo "${timestamp}$@"
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fi
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if [ $LOG_VERBOSITY -ge 0 ]; then
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timestamp="$(date +'%b %_d %T') "
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echo "${timestamp}$@" >> $STARTUP_LOG
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fi
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}
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#
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# Set a standard chain's policy
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#
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setpolicy() # $1 = name of chain, $2 = policy
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{
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run_iptables -P $1 $2
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}
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#
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# Generate a list of all network interfaces on the system
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#
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find_all_interfaces() {
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${IP:-ip} link list | egrep '^[[:digit:]]+:' | cut -d ' ' -f2 | sed -r 's/(@.*)?:$//'
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}
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#
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# Generate a list of all network interfaces on the system that have an ipv6 address
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#
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find_all_interfaces1() {
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${IP:-ip} -6 addr list | egrep '^[[:digit:]]+:' | cut -d ' ' -f2 | sed -r 's/(@.*)?:$//'
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}
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#
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# Find the value 'dev' in the passed arguments then echo the next value
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#
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find_device() {
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while [ $# -gt 1 ]; do
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[ "x$1" = xdev ] && echo $2 && return
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shift
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done
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}
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#
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# Find the value 'via' in the passed arguments then echo the next value
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#
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find_gateway() {
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while [ $# -gt 1 ]; do
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[ "x$1" = xvia ] && echo $2 && return
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shift
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done
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}
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#
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# Find the value 'mtu' in the passed arguments then echo the next value
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#
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find_mtu() {
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while [ $# -gt 1 ]; do
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[ "x$1" = xmtu ] && echo $2 && return
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shift
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done
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}
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#
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# Find the value 'peer' in the passed arguments then echo the next value up to
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# "/"
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#
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find_peer() {
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while [ $# -gt 1 ]; do
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[ "x$1" = xpeer ] && echo ${2%/*} && return
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shift
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done
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}
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#
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# Try to find the gateway through an interface looking for 'nexthop'
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find_nexthop() # $1 = interface
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{
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echo $(find_gateway `$IP -6 route list | grep "[[:space:]]nexthop.* $1"`)
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}
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#
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# Find the default route's interface
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#
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find_default_interface() {
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$IP -6 route list | while read first rest; do
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[ "$first" = default ] && echo $(find_device $rest) && return
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done
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}
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#
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# Determine if Interface is up
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#
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interface_is_up() {
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[ -n "$($IP -6 link list dev $1 2> /dev/null | grep -e '[<,]UP[,>]')" ]
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}
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#
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# Determine if interface is usable from a Netfilter prespective
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#
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interface_is_usable() # $1 = interface
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{
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[ "$1" = lo ] && return 0
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interface_is_up $1 && [ "$(find_first_interface_address_if_any $1)" != :: ] && run_isusable_exit $1
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}
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#
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# Find interface addresses--returns the set of addresses assigned to the passed
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# device
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#
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find_interface_addresses() # $1 = interface
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{
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$IP -f inet6 addr show $1 2> /dev/null | grep 'inet6 2' | sed 's/\s*inet6 //;s/\/.*//;s/ peer.*//'
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}
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#
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# Get all interface addresses with VLSMs
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#
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find_interface_full_addresses() # $1 = interface
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{
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$IP -f inet6 addr show $1 2> /dev/null | grep 'inet6 ' | sed 's/\s*inet6 //;s/ scope.*//;s/ peer.*//'
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}
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#
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# echo the list of networks routed out of a given interface
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#
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get_routed_networks() # $1 = interface name, $2-n = Fatal error message
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{
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local address
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local rest
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$IP -6 route show dev $1 2> /dev/null |
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while read address rest; do
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case "$address" in
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default)
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if [ $# -gt 1 ]; then
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shift
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fatal_error "$@"
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else
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echo "WARNING: default route ignored on interface $1" >&2
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fi
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;;
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multicast|broadcast|prohibit|nat|throw|nexthop)
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;;
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2*)
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[ "$address" = "${address%/*}" ] && address="${address}/128"
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echo $address
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;;
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esac
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done
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}
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#
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# Normalize an IPv6 Address by compressing out consecutive zero elements
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#
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normalize_address() # $1 = valid IPv6 Address
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{
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local address
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address=$1
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local j
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while true; do
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case $address in
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::*)
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address=0$address
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;;
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*::*)
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list_count $(split $address)
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j=$?
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if [ $j -eq 7 ]; then
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address=${address%::*}:0:${address#*::}
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elif [ $j -eq 8 ]; then
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$address=${address%::*}:${address#*::}
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break 2
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else
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address=${address%::*}:0::${address#*::}
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fi
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;;
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*)
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echo $address
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break 2
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;;
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esac
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done
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}
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#
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# Reads correctly-formed and fully-qualified host and subnet addresses from STDIN. For each
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# that defines a /120 or larger network, it sends to STDOUT:
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#
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# The corresponding subnet-router anycast address (all host address bits are zero)
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# The corresponding anycast addresses defined by RFC 2526 (the last 128 addresses in the subnet)
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#
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convert_to_anycast() {
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local address
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local badress
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local vlsm
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local host
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local o
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local m
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m=
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local z
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z=65535
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local l
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while read address; do
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case $address in
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2*|3*)
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vlsm=${address#*/}
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vlsm=${vlsm:=128}
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if [ $vlsm -le 120 ]; then
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#
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# Defines a viable subnet -- first get the subnet-router anycast address
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#
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host=$((128 - $vlsm))
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address=$(normalize_address ${address%/*})
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while [ $host -ge 16 ]; do
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address=${address%:*}
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host=$(($host - 16))
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done
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if [ $host -gt 0 ]; then
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#
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# VLSM is not a multiple of 16
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#
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host=$((16 - $host))
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o=$((0x${address##*:}))
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m=0
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while [ $host -gt 0 ]; do
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m=$((($m >> 1) | 0x8000))
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z=$(($z >> 1))
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host=$(($host - 1))
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done
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o=$(($o & $m))
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badress=${address%:*}
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address=$badress:$(printf %04x $o)
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z=$(($o | $z))
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if [ $vlsm -gt 112 ]; then
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z=$(($z & 0xff80))
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fi
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badress=$badress:$(printf %04x $z)
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else
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badress=$address
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fi
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#
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# Note: at this point $address and $badress are the same except possibly for
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# the contents of the last half-word
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#
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list_count $(split $address)
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l=$?
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#
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# Now generate the anycast addresses defined by RFC 2526
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#
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if [ $l -lt 8 ]; then
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#
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# The subnet-router address
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#
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echo $address::
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while [ $l -lt 8 ]; do
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badress=$badress:ffff
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l=$(($l + 1 ))
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done
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else
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#
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# The subnet-router address
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#
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echo $address
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fi
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#
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# And the RFC 2526 addresses
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#
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echo $badress/121
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fi
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;;
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esac
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done
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}
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#
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# Generate a list of anycast addresses for a given interface
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#
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get_interface_acasts() # $1 = interface
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{
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local addresses
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addresses=
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find_interface_full_addresses $1 | convert_to_anycast | sort -u
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}
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#
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# Get a list of all configured anycast addresses on the system
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#
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get_all_acasts()
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{
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find_interface_full_addresses | convert_to_anycast | sort -u
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}
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#
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# Detect the gateway through an interface
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#
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detect_gateway() # $1 = interface
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{
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local interface
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interface=$1
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#
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# First assume that this is some sort of point-to-point interface
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#
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gateway=$( find_peer $($IP -6 addr list $interface ) )
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#
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# Maybe there's a default route through this gateway already
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#
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[ -n "$gateway" ] || gateway=$(find_gateway $($IP -6 route list dev $interface | grep '^default'))
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#
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# Last hope -- is there a load-balancing route through the interface?
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#
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[ -n "$gateway" ] || gateway=$(find_nexthop $interface)
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#
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# Be sure we found one
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#
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[ -n "$gateway" ] && echo $gateway
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}
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delete_tc1()
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{
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clear_one_tc() {
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$TC qdisc del dev $1 root 2> /dev/null
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$TC qdisc del dev $1 ingress 2> /dev/null
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}
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run_tcclear_exit
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run_ip link list | \
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while read inx interface details; do
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case $inx in
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[0-9]*)
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clear_one_tc ${interface%:}
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;;
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*)
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;;
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esac
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done
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}
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#
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# Detect a device's MTU -- echos the passed device's MTU
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#
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get_device_mtu() # $1 = device
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{
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local output
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output="$($IP link list dev $1 2> /dev/null)" # quotes required for /bin/ash
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if [ -n "$output" ]; then
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echo $(find_mtu $output)
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else
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echo 1500
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fi
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}
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#
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# Version of the above that doesn't generate any output for MTU 1500.
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# Generates 'mtu <mtu+>' otherwise, where <mtu+> is the device's MTU + 100
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#
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get_device_mtu1() # $1 = device
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{
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local output
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output="$($IP link list dev $1 2> /dev/null)" # quotes required for /bin/ash
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local mtu
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if [ -n "$output" ]; then
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mtu=$(find_mtu $output)
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if [ -n "$mtu" ]; then
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[ $mtu = 1500 ] || echo mtu $(($mtu + 100))
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fi
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fi
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}
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#
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# Undo changes to routing
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#
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undo_routing() {
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if [ -z "$g_noroutes" ]; then
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#
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# Restore rt_tables database
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#
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if [ -f ${VARDIR}/rt_tables ]; then
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[ -w /etc/iproute2/rt_table -a -z "$KEEP_RT_TABLES" ] && cp -f ${VARDIR}/rt_tables /etc/iproute2/ && progress_message "/etc/iproute2/rt_tables database restored"
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rm -f ${VARDIR}/rt_tables
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fi
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#
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# Restore the rest of the routing table
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#
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if [ -f ${VARDIR}/undo_routing ]; then
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. ${VARDIR}/undo_routing
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progress_message "Shorewall-generated routing tables and routing rules removed"
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rm -f ${VARDIR}/undo_*routing
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fi
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fi
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}
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#
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# Save the default route
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#
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save_default_route() {
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awk \
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'BEGIN {defroute=0;};
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/^default / {defroute=1; print; next};
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/nexthop/ {if (defroute == 1 ) {print ; next} };
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{ defroute=0; };'
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}
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#
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# Restore the default route that was in place before the initial 'shorewall start'
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#
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replace_default_route() # $1 = USE_DEFAULT_RT
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{
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#
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# default_route and result are inherited from the caller
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#
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if [ -n "$default_route" ]; then
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case "$default_route" in
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*metric*)
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#
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# Don't restore a default route with a metric unless USE_DEFAULT_RT=Yes. Otherwise, we only replace the one with metric 0
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#
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[ -n "$1" ] && qt $IP -6 route replace $default_route && progress_message "Default Route (${default_route# }) restored"
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default_route=
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;;
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*)
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qt $IP -6 route replace $default_route && progress_message "Default Route (${default_route# }) restored"
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result=0
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default_route=
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;;
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esac
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fi
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}
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restore_default_route() # $1 = USE_DEFAULT_RT
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{
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local result
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result=1
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if [ -z "$g_noroutes" -a -f ${VARDIR}/default_route ]; then
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local default_route
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default_route=
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local route
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while read route ; do
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case $route in
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default*)
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replace_default_route $1
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default_route="$default_route $route"
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;;
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*)
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default_route="$default_route $route"
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;;
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esac
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done < ${VARDIR}/default_route
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replace_default_route $1
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if [ $result = 1 ]; then
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#
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# We didn't restore a default route with metric 0
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#
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if $IP -6 -o route list 2> /dev/null | fgrep default | fgrep -qv metric; then
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#
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# But we added a default route with metric 0
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#
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qt $IP -6 route del default metric 0 && progress_message "Default route with metric 0 deleted"
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fi
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fi
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rm -f ${VARDIR}/default_route
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fi
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return $result
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}
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#
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# Determine how to do "echo -e"
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#
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find_echo() {
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local result
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result=$(echo "a\tb")
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[ ${#result} -eq 3 ] && { echo echo; return; }
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result=$(echo -e "a\tb")
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[ ${#result} -eq 3 ] && { echo "echo -e"; return; }
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result=$(which echo)
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[ -n "$result" ] && { echo "$result -e"; return; }
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echo echo
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}
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#
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# Flush the conntrack table if $g_purge is non-empty
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#
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conditionally_flush_conntrack() {
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if [ -n "$g_purge" ]; then
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if [ -n $(which conntrack) ]; then
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conntrack -F
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else
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error_message "WARNING: The '-p' option requires the conntrack utility which does not appear to be installed on this system"
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fi
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fi
|
|
}
|
|
|
|
#
|
|
# Clear Proxy NDP
|
|
#
|
|
delete_proxyndp() {
|
|
if [ -f ${VARDIR}/proxyndp ]; then
|
|
while read address interface external haveroute; do
|
|
qt $IP -6 neigh del proxy $address dev $external
|
|
[ -z "${haveroute}${g_noroutes}" ] && qt $IP -6 route del $address/128 dev $interface
|
|
f=/proc/sys/net/ipv6/conf/$interface/proxy_ndp
|
|
[ -f $f ] && echo 0 > $f
|
|
done < ${VARDIR}/proxyndp
|
|
|
|
rm -f ${VARDIR}/proxyndp
|
|
fi
|
|
}
|
|
|
|
#
|
|
# Remove all Shorewall-added rules
|
|
#
|
|
clear_firewall() {
|
|
stop_firewall
|
|
|
|
setpolicy INPUT ACCEPT
|
|
setpolicy FORWARD ACCEPT
|
|
setpolicy OUTPUT ACCEPT
|
|
|
|
run_iptables -F
|
|
qt $IP6TABLES -t raw -F
|
|
|
|
echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
|
|
|
|
run_clear_exit
|
|
|
|
set_state "Cleared"
|
|
|
|
logger -p kern.info "$g_product Cleared"
|
|
}
|
|
|
|
#
|
|
# Issue a message and stop/restore the firewall
|
|
#
|
|
fatal_error()
|
|
{
|
|
echo " ERROR: $@" >&2
|
|
|
|
if [ $LOG_VERBOSITY -gt 1 ]; then
|
|
timestamp="$(date +'%_b %d %T') "
|
|
echo "${timestamp} ERROR: $@" >> $STARTUP_LOG
|
|
fi
|
|
|
|
stop_firewall
|
|
[ -n "$TEMPFILE" ] && rm -f $TEMPFILE
|
|
exit 2
|
|
}
|
|
|
|
#
|
|
# Issue a message and stop
|
|
#
|
|
startup_error() # $* = Error Message
|
|
{
|
|
echo " ERROR: $@: Firewall state not changed" >&2
|
|
|
|
if [ $LOG_VERBOSITY -ge 0 ]; then
|
|
timestamp="$(date +'%_b %d %T') "
|
|
echo "${timestamp} ERROR: $@" >> $STARTUP_LOG
|
|
fi
|
|
|
|
case $COMMAND in
|
|
start)
|
|
logger -p kern.err "ERROR:$g_product start failed:Firewall state not changed"
|
|
;;
|
|
restart)
|
|
logger -p kern.err "ERROR:$g_product restart failed:Firewall state not changed"
|
|
;;
|
|
restore)
|
|
logger -p kern.err "ERROR:$g_product restore failed:Firewall state not changed"
|
|
;;
|
|
esac
|
|
|
|
if [ $LOG_VERBOSITY -gt 1 ]; then
|
|
timestamp="$(date +'%_b %d %T') "
|
|
|
|
case $COMMAND in
|
|
start)
|
|
echo "${timestamp} ERROR:$g_product start failed:Firewall state not changed" >> $STARTUP_LOG
|
|
;;
|
|
restart)
|
|
echo "${timestamp} ERROR:$g_product restart failed:Firewall state not changed" >> $STARTUP_LOG
|
|
;;
|
|
restore)
|
|
echo "${timestamp} ERROR:$g_product restore failed:Firewall state not changed" >> $STARTUP_LOG
|
|
;;
|
|
esac
|
|
fi
|
|
|
|
kill $$
|
|
exit 2
|
|
}
|
|
|
|
#
|
|
# Run iptables and if an error occurs, stop/restore the firewall
|
|
#
|
|
run_iptables()
|
|
{
|
|
local status
|
|
|
|
while [ 1 ]; do
|
|
$IP6TABLES $@
|
|
status=$?
|
|
[ $status -ne 4 ] && break
|
|
done
|
|
|
|
if [ $status -ne 0 ]; then
|
|
error_message "ERROR: Command \"$IP6TABLES $@\" Failed"
|
|
stop_firewall
|
|
exit 2
|
|
fi
|
|
}
|
|
|
|
#
|
|
# Run iptables retrying exit status 4
|
|
#
|
|
do_iptables()
|
|
{
|
|
local status
|
|
|
|
while [ 1 ]; do
|
|
$IP6TABLES $@
|
|
status=$?
|
|
[ $status -ne 4 ] && return $status;
|
|
done
|
|
}
|
|
|
|
#
|
|
# Run iptables and if an error occurs, stop/restore the firewall
|
|
#
|
|
run_ip()
|
|
{
|
|
if ! $IP -6 $@; then
|
|
error_message "ERROR: Command \"$IP -6 $@\" Failed"
|
|
stop_firewall
|
|
exit 2
|
|
fi
|
|
}
|
|
|
|
#
|
|
# Run tc and if an error occurs, stop/restore the firewall
|
|
#
|
|
run_tc() {
|
|
if ! $TC $@ ; then
|
|
error_message "ERROR: Command \"$TC $@\" Failed"
|
|
stop_firewall
|
|
exit 2
|
|
fi
|
|
}
|
|
|
|
#
|
|
# Run the .iptables_restore_input as a set of discrete iptables commands
|
|
#
|
|
debug_restore_input() {
|
|
local first second rest table chain
|
|
#
|
|
# Clear the ruleset
|
|
#
|
|
qt1 $IP6TABLES -t mangle -F
|
|
qt1 $IP6TABLES -t mangle -X
|
|
|
|
for chain in PREROUTING INPUT FORWARD POSTROUTING; do
|
|
qt1 $IP6TABLES -t mangle -P $chain ACCEPT
|
|
done
|
|
|
|
qt1 $IP6TABLES -t raw -F
|
|
qt1 $IP6TABLES -t raw -X
|
|
|
|
for chain in PREROUTING OUTPUT; do
|
|
qt1 $IP6TABLES -t raw -P $chain ACCEPT
|
|
done
|
|
|
|
qt1 $IP6TABLES -t filter -F
|
|
qt1 $IP6TABLES -t filter -X
|
|
|
|
for chain in INPUT FORWARD OUTPUT; do
|
|
qt1 $IP6TABLES -t filter -P $chain -P ACCEPT
|
|
done
|
|
|
|
while read first second rest; do
|
|
case $first in
|
|
-*)
|
|
#
|
|
# We can't call run_iptables() here because the rules may contain quoted strings
|
|
#
|
|
eval $IP6TABLES -t $table $first $second $rest
|
|
|
|
if [ $? -ne 0 ]; then
|
|
error_message "ERROR: Command \"$IP6TABLES $first $second $rest\" Failed"
|
|
stop_firewall
|
|
exit 2
|
|
fi
|
|
;;
|
|
:*)
|
|
chain=${first#:}
|
|
|
|
if [ "x$second" = x- ]; then
|
|
do_iptables -t $table -N $chain
|
|
else
|
|
do_iptables -t $table -P $chain $second
|
|
fi
|
|
|
|
if [ $? -ne 0 ]; then
|
|
error_message "ERROR: Command \"$IP6TABLES $first $second $rest\" Failed"
|
|
stop_firewall
|
|
exit 2
|
|
fi
|
|
;;
|
|
#
|
|
# This grotesque hack with the table names works around a bug/feature with ash
|
|
#
|
|
'*'raw)
|
|
table=raw
|
|
;;
|
|
'*'mangle)
|
|
table=mangle
|
|
;;
|
|
'*'nat)
|
|
table=nat
|
|
;;
|
|
'*'filter)
|
|
table=filter
|
|
;;
|
|
esac
|
|
done
|
|
}
|
|
|
|
################################################################################
|
|
# End of functions imported from /usr/share/shorewall/prog.header6
|
|
################################################################################
|