forked from extern/shorewall_code
Move DNAT/REDIRECT processing code to lib.nat
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@4817 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
This commit is contained in:
teastep
parent
71b29cfe99
commit
bad66d0f1a
@ -15,6 +15,8 @@ Changes in 3.3.4
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7) Fix whitespace in LOGFORMAT.
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8) Move DNAT/REDIRECT code to lib.base.
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Changes in 3.3.4
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1) Make exclusion work with "show zones"
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@ -1596,195 +1596,6 @@ __EOF__
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done
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}
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#
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# Add a NAT rule - Helper function for the rules file processor
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#
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# The caller has established the following variables:
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# cli = Source IP, interface or MAC Specification
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# serv = Destination IP Specification
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# servport = Port the server is listening on
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# dest_interface = Destination Interface Specification
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# proto = Protocol Specification
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# addr = Original Destination Address
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# dports = Destination Port Specification. 'dports' may be changed
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# by this function
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# cport = Source Port Specification
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# multiport = String to invoke multiport match if appropriate
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# ratelimit = Optional rate limiting clause
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# userandgroup = -m owner match to limit the rule to a particular user and/or group
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# logtag = Log tag
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# excludesource = Source Exclusion List
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#
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add_nat_rule() {
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local chain
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local excludedests=
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# Be sure we can NAT
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if [ -z "$NAT_ENABLED" ]; then
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fatal_error "Rule \"$rule\" requires NAT which is disabled"
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fi
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# Parse SNAT address if any
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if [ "$addr" != "${addr%:*}" ]; then
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fatal_error "SNAT may no longer be specified in a DNAT rule; use ${CONFDIR}/masq instead"
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fi
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# Set original destination address
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case $addr in
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all)
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addr=
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;;
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detect)
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eval interfaces=\$${source}_interfaces
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if [ -n "$DETECT_DNAT_IPADDRS" -a "$source" != "$FW" ]; then
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save_command
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if [ $(list_count1 $interfaces) -eq 1 ]; then
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save_command "addr=\$(find_first_interface_address $interfaces)"
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else
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save_command "addr="
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for interface in $interfaces; do
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ident >&3 << __EOF__
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addr="\$addr \$(find_first_interface_address $interface)"
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__EOF__
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done
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fi
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else
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addr=
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fi
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;;
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!*)
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if [ $(list_count $addr) -gt 1 ]; then
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excludedests="${addr#\!}"
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addr=
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fi
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;;
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esac
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addr=${addr:-0.0.0.0/0}
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# Select target
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if [ "$logtarget" = SAME ]; then
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[ -n "$servport" ] && fatal_error "Port mapping not allowed in SAME rules"
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serv1=
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for srv in $(separate_list $serv); do
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serv1="$serv1 --to ${srv}"
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done
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target1="SAME $serv1"
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elif [ -n "$serv" ]; then
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servport="${servport:+:$servport}"
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serv1=
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for srv in $(separate_list $serv); do
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serv1="$serv1 --to-destination ${srv}${servport}"
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done
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target1="DNAT $serv1"
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else
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target1="REDIRECT --to-port $servport"
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fi
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# Generate nat table rules
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if [ "$source" = "$FW" ]; then
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if [ -n "${excludesource}${excludedests}" ]; then
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build_exclusion_chain chain nat "$excludesource" $excludedests
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for adr in $(separate_list $addr); do
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run_iptables2 -t nat -A OUTPUT $cli $proto $userandgroup $multiport $sports $dports $(dest_ip_range $adr) -j $chain
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done
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if [ -n "$loglevel" ]; then
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log_rule_limit $loglevel $chain OUTPUT $logtarget "$ratelimit" "$logtag" -A -t nat
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fi
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addnatrule $chain $ratelimit $proto -j $target1 # Protocol is necessary for port redirection
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else
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for adr in $(separate_list $addr); do
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if [ -n "$loglevel" ]; then
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log_rule_limit $loglevel OUTPUT OUTPUT $logtarget "$ratelimit" "$logtag" -A -t nat \
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$(fix_bang $proto $cli $sports $userandgroup $(dest_ip_range $adr) $multiport $dports)
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fi
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run_iptables2 -t nat -A OUTPUT $ratelimit $proto $sports $userandgroup $(dest_ip_range $adr) $multiport $dports -j $target1
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done
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fi
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else
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if [ -n "${excludesource}${excludedests}" ]; then
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build_exclusion_chain chain nat "$excludesource" $excludedests
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if [ $addr = detect ]; then
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ensurenatchain $(dnat_chain $source)
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#
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# The 'for loops' begun below are completed in add_a_rule() whose declaration follows
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#
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indent >&3 << __EOF__
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for adr in \$addr; do
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run_iptables -t nat -A $(fix_bang $(dnat_chain $source) $cli $proto $multiport $sports $dports) -d \$adr -j $chain
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__EOF__
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else
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for adr in $(separate_list $addr); do
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addnatrule $(dnat_chain $source) $cli $proto $multiport $sports $dports $(dest_ip_range $adr) -j $chain
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done
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fi
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if [ -n "$loglevel" ]; then
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log_rule_limit $loglevel $chain $(dnat_chain $source) $logtarget "$ratelimit" "$logtag" -A -t nat
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fi
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addnatrule $chain $ratelimit $proto -j $target1 # Protocol is necessary for port redirection
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else
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chain=$(dnat_chain $source)
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if [ $addr = detect ]; then
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ensurenatchain $chain
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indent >&3 << __EOF__
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for adr in \$addr; do
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__EOF__
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if [ -n "$loglevel" ]; then
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indent >&3 << __EOF__
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log_rule_limit $loglevel $chain $chain $logtarget "$ratelimit" "$logtag" -A -t nat $(fix_bang $proto $cli $sports $multiport $dports) -d \$adr
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__EOF__
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fi
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indent >&3 << __EOF__
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run_iptables -t nat -A $chain $(fix_bang $proto $ratelimit $cli $sports $multiport $dports) -d \$adr -j $target1
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__EOF__
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else
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for adr in $(separate_list $addr); do
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if [ -n "$loglevel" ]; then
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ensurenatchain $chain
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log_rule_limit $loglevel $chain $chain $logtarget "$ratelimit" "$logtag" -A -t nat \
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$(fix_bang $proto $cli $sports $(dest_ip_range $adr) $multiport $dports)
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fi
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addnatrule $chain $proto $ratelimit $cli $sports \
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-d $adr $multiport $dports -j $target1
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done
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fi
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fi
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fi
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# Replace destination port by the new destination port
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if [ -n "$servport" ]; then
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if [ -z "$multiport" ]; then
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dports="--dport ${servport#*:}"
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else
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dports="--dports ${servport#*:}"
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fi
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fi
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[ "x$addr" = "x0.0.0.0/0" ] && addr=
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ratelimit=
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}
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#
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# Add one Filter Rule
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#
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@ -2028,6 +1839,7 @@ add_a_rule() {
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# A specific server or server port given
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if [ -n "$natrule" ]; then
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lib_load nat "$logtarget Rules"
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add_nat_rule
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[ $policy = ACCEPT ] && return
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elif [ -n "$servport" -a "$servport" != "$port" ]; then
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@ -22,7 +22,8 @@
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# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA
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#
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# This library is loaded by /usr/share/shorewall/compiler when any of the following
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# configuration files are non-empty: masq, nat, netmap
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# configuration files are non-empty: masq, nat, netmap; or when there are
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# DNAT/REDIRECT rules in the /etc/shorewall/rules file.
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#
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#
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@ -580,3 +581,192 @@ setup_netmap() {
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done < $TMP_DIR/netmap
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}
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#
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# Add a NAT rule - Helper function for the rules file processor
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#
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# The caller has established the following variables:
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# cli = Source IP, interface or MAC Specification
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# serv = Destination IP Specification
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# servport = Port the server is listening on
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# dest_interface = Destination Interface Specification
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# proto = Protocol Specification
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# addr = Original Destination Address
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# dports = Destination Port Specification. 'dports' may be changed
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# by this function
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# cport = Source Port Specification
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# multiport = String to invoke multiport match if appropriate
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# ratelimit = Optional rate limiting clause
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# userandgroup = -m owner match to limit the rule to a particular user and/or group
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# logtag = Log tag
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# excludesource = Source Exclusion List
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#
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add_nat_rule() {
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local chain
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local excludedests=
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# Be sure we can NAT
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if [ -z "$NAT_ENABLED" ]; then
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fatal_error "Rule \"$rule\" requires NAT which is disabled"
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fi
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# Parse SNAT address if any
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if [ "$addr" != "${addr%:*}" ]; then
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fatal_error "SNAT may no longer be specified in a DNAT rule; use ${CONFDIR}/masq instead"
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fi
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# Set original destination address
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case $addr in
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all)
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addr=
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;;
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detect)
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eval interfaces=\$${source}_interfaces
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if [ -n "$DETECT_DNAT_IPADDRS" -a "$source" != "$FW" ]; then
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save_command
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if [ $(list_count1 $interfaces) -eq 1 ]; then
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save_command "addr=\$(find_first_interface_address $interfaces)"
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else
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save_command "addr="
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for interface in $interfaces; do
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ident >&3 << __EOF__
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addr="\$addr \$(find_first_interface_address $interface)"
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__EOF__
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done
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fi
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else
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addr=
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fi
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;;
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!*)
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if [ $(list_count $addr) -gt 1 ]; then
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excludedests="${addr#\!}"
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addr=
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fi
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;;
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esac
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addr=${addr:-0.0.0.0/0}
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# Select target
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if [ "$logtarget" = SAME ]; then
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[ -n "$servport" ] && fatal_error "Port mapping not allowed in SAME rules"
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serv1=
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for srv in $(separate_list $serv); do
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serv1="$serv1 --to ${srv}"
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done
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target1="SAME $serv1"
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elif [ -n "$serv" ]; then
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servport="${servport:+:$servport}"
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serv1=
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for srv in $(separate_list $serv); do
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serv1="$serv1 --to-destination ${srv}${servport}"
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done
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target1="DNAT $serv1"
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else
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target1="REDIRECT --to-port $servport"
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fi
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# Generate nat table rules
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if [ "$source" = "$FW" ]; then
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if [ -n "${excludesource}${excludedests}" ]; then
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build_exclusion_chain chain nat "$excludesource" $excludedests
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for adr in $(separate_list $addr); do
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run_iptables2 -t nat -A OUTPUT $cli $proto $userandgroup $multiport $sports $dports $(dest_ip_range $adr) -j $chain
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done
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if [ -n "$loglevel" ]; then
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log_rule_limit $loglevel $chain OUTPUT $logtarget "$ratelimit" "$logtag" -A -t nat
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fi
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addnatrule $chain $ratelimit $proto -j $target1 # Protocol is necessary for port redirection
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else
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for adr in $(separate_list $addr); do
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if [ -n "$loglevel" ]; then
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log_rule_limit $loglevel OUTPUT OUTPUT $logtarget "$ratelimit" "$logtag" -A -t nat \
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$(fix_bang $proto $cli $sports $userandgroup $(dest_ip_range $adr) $multiport $dports)
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fi
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run_iptables2 -t nat -A OUTPUT $ratelimit $proto $sports $userandgroup $(dest_ip_range $adr) $multiport $dports -j $target1
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done
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fi
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else
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if [ -n "${excludesource}${excludedests}" ]; then
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build_exclusion_chain chain nat "$excludesource" $excludedests
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if [ $addr = detect ]; then
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ensurenatchain $(dnat_chain $source)
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#
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# The 'for loops' begun below are completed in add_a_rule() whose declaration follows
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#
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indent >&3 << __EOF__
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for adr in \$addr; do
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run_iptables -t nat -A $(fix_bang $(dnat_chain $source) $cli $proto $multiport $sports $dports) -d \$adr -j $chain
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__EOF__
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else
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for adr in $(separate_list $addr); do
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addnatrule $(dnat_chain $source) $cli $proto $multiport $sports $dports $(dest_ip_range $adr) -j $chain
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done
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fi
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if [ -n "$loglevel" ]; then
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log_rule_limit $loglevel $chain $(dnat_chain $source) $logtarget "$ratelimit" "$logtag" -A -t nat
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fi
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addnatrule $chain $ratelimit $proto -j $target1 # Protocol is necessary for port redirection
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else
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chain=$(dnat_chain $source)
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if [ $addr = detect ]; then
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ensurenatchain $chain
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indent >&3 << __EOF__
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for adr in \$addr; do
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__EOF__
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if [ -n "$loglevel" ]; then
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indent >&3 << __EOF__
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log_rule_limit $loglevel $chain $chain $logtarget "$ratelimit" "$logtag" -A -t nat $(fix_bang $proto $cli $sports $multiport $dports) -d \$adr
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__EOF__
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fi
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indent >&3 << __EOF__
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run_iptables -t nat -A $chain $(fix_bang $proto $ratelimit $cli $sports $multiport $dports) -d \$adr -j $target1
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__EOF__
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else
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for adr in $(separate_list $addr); do
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if [ -n "$loglevel" ]; then
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ensurenatchain $chain
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log_rule_limit $loglevel $chain $chain $logtarget "$ratelimit" "$logtag" -A -t nat \
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$(fix_bang $proto $cli $sports $(dest_ip_range $adr) $multiport $dports)
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fi
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addnatrule $chain $proto $ratelimit $cli $sports \
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-d $adr $multiport $dports -j $target1
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done
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fi
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fi
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fi
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# Replace destination port by the new destination port
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if [ -n "$servport" ]; then
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if [ -z "$multiport" ]; then
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dports="--dport ${servport#*:}"
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else
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dports="--dports ${servport#*:}"
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fi
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fi
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[ "x$addr" = "x0.0.0.0/0" ] && addr=
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ratelimit=
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}
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@ -122,7 +122,8 @@ New Features:
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option in /etc/shorewall/interfaces or /etc/shorewall/hosts.
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- lib.nat. Must be available if you have entries in
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/etc/shorewall/masq, /etc/shorewall/nat or /etc/shorewall/netmap.
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/etc/shorewall/masq, /etc/shorewall/nat or /etc/shorewall/netmap
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or if you use DNAT or REDIRECT rules.
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- lib.providers. Must be available if you have entries in
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/etc/shorewall/providers.
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