firewall: - allow multiple ports, protocols, macs, icmp types per rule - implement "limit" and "limit_burst" options for rules - implement "extra" option to rules and redirects for passing arbritary flags to iptables - implement negations for "src_port", "dest_port", "src_dport", "src_mac", "proto" and "icmp_type" options - allow wildcard (*) "src" and "dest" options in rules to allow specifying "any" source or destination - validate symbolic icmp-type names against the selected iptables binary - properly handle forwarded ICMPv6 traffic in the default configuration
SVN-Revision: 27317
This commit is contained in:
Jo-Philipp Wich
parent
8976fa2622
commit
68a1c8e1e3
6 changed files with 219 additions and 73 deletions
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@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
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PKG_NAME:=firewall
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PKG_VERSION:=2
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PKG_RELEASE:=26
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PKG_RELEASE:=27
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include $(INCLUDE_DIR)/package.mk
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@ -35,13 +35,40 @@ config rule
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option target ACCEPT
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option family ipv4
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#Allow ping
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# Allow IPv4 ping
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config rule
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option src wan
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option proto icmp
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option icmp_type echo-request
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option family ipv4
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option target ACCEPT
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# Allow essential incoming IPv6 ICMP traffic
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config rule
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option src wan
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option dest *
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option proto icmp
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list icmp_type router-solicitation
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list icmp_type router-advertisement
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list icmp_type neighbour-solicitation
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list icmp_type neighbour-advertisement
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list icmp_type echo-request
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list icmp_type destination-unreachable
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list icmp_type packet-too-big
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list icmp_type time-exceeded
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option limit 1000/sec
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option family ipv6
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option target ACCEPT
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# Drop leaking router advertisements on WAN
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config rule
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option src *
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option dest wan
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option proto icmp
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option icmp_type router-advertisement
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option family ipv6
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option target DROP
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# include a file with users custom iptables rules
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config include
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option path /etc/firewall.user
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@ -13,11 +13,11 @@ fw_config_get_redirect() {
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string src_dport "" \
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string dest "" \
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ipaddr dest_ip "" \
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string dest_mac "" \
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string dest_port "" \
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string proto "tcpudp" \
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string family "" \
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string target "DNAT" \
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string extra "" \
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} || return
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[ -n "$redirect_name" ] || redirect_name=$redirect__name
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}
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@ -29,26 +29,27 @@ fw_load_redirect() {
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local fwdchain natchain natopt nataddr natports srcdaddr srcdports
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if [ "$redirect_target" == "DNAT" ]; then
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[ -n "$redirect_src" -a -n "$redirect_dest_ip$redirect_dest_port" ] || {
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[ -n "${redirect_src#*}" -a -n "$redirect_dest_ip$redirect_dest_port" ] || {
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fw_log error "DNAT redirect ${redirect_name}: needs src and dest_ip or dest_port, skipping"
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return 0
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}
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fwdchain="zone_${redirect_src}${redirect_dest_ip:+_forward}"
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fwdchain="zone_${redirect_src}_forward"
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natopt="--to-destination"
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natchain="zone_${redirect_src}_prerouting"
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nataddr="$redirect_dest_ip"
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fw_get_port_range natports "$redirect_dest_port" "-"
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fw_get_port_range natports "${redirect_dest_port#!}" "-"
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fw_get_negation srcdaddr '-d' "${redirect_src_dip:+$redirect_src_dip/$redirect_src_dip_prefixlen}"
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fw_get_port_range srcdports "$redirect_src_dport" ":"
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fw_get_negation srcdports '--dport' "$srcdports"
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list_contains FW_CONNTRACK_ZONES $redirect_src || \
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append FW_CONNTRACK_ZONES $redirect_src
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elif [ "$redirect_target" == "SNAT" ]; then
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[ -n "$redirect_dest" -a -n "$redirect_src_dip" ] || {
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[ -n "${redirect_dest#*}" -a -n "$redirect_src_dip" ] || {
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fw_log error "SNAT redirect ${redirect_name}: needs dest and src_dip, skipping"
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return 0
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}
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@ -58,10 +59,11 @@ fw_load_redirect() {
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natopt="--to-source"
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natchain="zone_${redirect_dest}_nat"
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nataddr="$redirect_src_dip"
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fw_get_port_range natports "$redirect_src_dport" "-"
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fw_get_port_range natports "${redirect_src_dport#!}" "-"
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fw_get_negation srcdaddr '-d' "${redirect_dest_ip:+$redirect_dest_ip/$redirect_dest_ip_prefixlen}"
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fw_get_port_range srcdports "$redirect_dest_port" ":"
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fw_get_negation srcdports '--dport' "$srcdports"
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list_contains FW_CONNTRACK_ZONES $redirect_dest || \
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append FW_CONNTRACK_ZONES $redirect_dest
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@ -79,35 +81,39 @@ fw_load_redirect() {
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local srcports
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fw_get_port_range srcports "$redirect_src_port" ":"
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fw_get_negation srcports '--sport' "$srcports"
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local destaddr
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fw_get_negation destaddr '-d' "${redirect_dest_ip:+$redirect_dest_ip/$redirect_dest_ip_prefixlen}"
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local destports
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fw_get_port_range destports "${redirect_dest_port:-$redirect_src_dport}" ":"
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fw_get_negation destports '--dport' "$destports"
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[ "$redirect_proto" == "tcpudp" ] && redirect_proto="tcp udp"
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for redirect_proto in $redirect_proto; do
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local pos
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eval 'pos=$((++FW__REDIR_COUNT_'${mode#G}'_'$natchain'))'
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fw add $mode n $natchain $redirect_target $pos { $redirect_src_ip $redirect_dest_ip } { \
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$srcaddr $srcdaddr \
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${redirect_proto:+-p $redirect_proto} \
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${srcports:+--sport $srcports} \
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${srcdports:+--dport $srcdports} \
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${redirect_src_mac:+-m mac --mac-source $redirect_src_mac} \
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fw_get_negation redirect_proto '-p' "$redirect_proto"
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for redirect_src_mac in ${redirect_src_mac:-""}; do
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fw_get_negation redirect_src_mac '--mac-source' "$redirect_src_mac"
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fw add $mode n $natchain $redirect_target + \
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{ $redirect_src_ip $redirect_dest_ip } { \
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$srcaddr $srcdaddr $redirect_proto \
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$srcports $srcdports \
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${redirect_src_mac:+-m mac $redirect_src_mac} \
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$natopt $nataddr${natports:+:$natports} \
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$redirect_options \
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}
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fw add $mode f ${fwdchain:-forward} ACCEPT ^ { $redirect_src_ip $redirect_dest_ip } { \
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$srcaddr ${destaddr:--m conntrack --ctstate DNAT} \
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${redirect_proto:+-p $redirect_proto} \
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${srcports:+--sport $srcports} \
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${destports:+--dport $destports} \
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${redirect_src_mac:+-m mac --mac-source $redirect_src_mac} \
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[ -n "$destaddr" ] && \
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fw add $mode f ${fwdchain:-forward} ACCEPT + \
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{ $redirect_src_ip $redirect_dest_ip } { \
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$srcaddr $destaddr $redirect_proto \
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$srcports $destports \
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$redirect_src_mac \
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$redirect_extra \
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}
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done
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done
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fw_callback post redirect
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}
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@ -16,24 +16,23 @@ fw_config_get_rule() {
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string proto "tcpudp" \
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string target "" \
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string family "" \
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string limit "" \
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string limit_burst "" \
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string extra "" \
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} || return
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[ -n "$rule_name" ] || rule_name=$rule__name
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[ "$rule_proto" == "icmp" ] || rule_icmp_type=
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}
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fw_load_rule() {
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fw_config_get_rule "$1"
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[ "$rule_target" != "NOTRACK" ] || [ -n "$rule_src" ] || {
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[ "$rule_target" != "NOTRACK" ] || [ -n "$rule_src" ] || [ "$rule_src" != "*" ] || {
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fw_log error "NOTRACK rule ${rule_name}: needs src, skipping"
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return 0
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}
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fw_callback pre rule
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fw_get_port_range rule_src_port $rule_src_port
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fw_get_port_range rule_dest_port $rule_dest_port
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local table=f
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local chain=input
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local target="${rule_target:-REJECT}"
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@ -41,8 +40,22 @@ fw_load_rule() {
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table=r
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chain="zone_${rule_src}_notrack"
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else
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[ -n "$rule_src" ] && chain="zone_${rule_src}${rule_dest:+_forward}"
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[ -n "$rule_dest" ] && target="zone_${rule_dest}_${target}"
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if [ -n "$rule_src" ]; then
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if [ "$rule_src" != "*" ]; then
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chain="zone_${rule_src}${rule_dest:+_forward}"
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else
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chain="${rule_dest:+forward}"
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chain="${chain:-input}"
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fi
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fi
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if [ -n "$rule_dest" ]; then
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if [ "$rule_dest" != "*" ]; then
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target="zone_${rule_dest}_${target}"
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elif [ "$target" = REJECT ]; then
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target=reject
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fi
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fi
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fi
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local mode
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@ -54,18 +67,32 @@ fw_load_rule() {
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[ "$rule_proto" == "tcpudp" ] && rule_proto="tcp udp"
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for rule_proto in $rule_proto; do
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local rule_pos
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eval 'rule_pos=$((++FW__RULE_COUNT_'${mode#G}'_'$chain'))'
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fw add $mode $table $chain $target $rule_pos { $rule_src_ip $rule_dest_ip } { \
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$src_spec $dest_spec \
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${rule_proto:+-p $rule_proto} \
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${rule_src_port:+--sport $rule_src_port} \
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${rule_src_mac:+-m mac --mac-source $rule_src_mac} \
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${rule_dest_port:+--dport $rule_dest_port} \
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fw_get_negation rule_proto '-p' "$rule_proto"
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for rule_src_port in ${rule_src_port:-""}; do
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fw_get_port_range rule_src_port $rule_src_port
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fw_get_negation rule_src_port '--sport' "$rule_src_port"
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for rule_dest_port in ${rule_dest_port:-""}; do
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fw_get_port_range rule_dest_port $rule_dest_port
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fw_get_negation rule_dest_port '--dport' "$rule_dest_port"
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for rule_src_mac in ${rule_src_mac:-""}; do
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fw_get_negation rule_src_mac '--mac-source' "$rule_src_mac"
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for rule_icmp_type in ${rule_icmp_type:-""}; do
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[ "$rule_proto" = "-p icmp" ] || rule_icmp_type=""
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fw add $mode $table $chain $target + \
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{ $rule_src_ip $rule_dest_ip } { \
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$src_spec $dest_spec $rule_proto \
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$rule_src_port $rule_dest_port \
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${rule_src_mac:+-m mac $rule_src_mac} \
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${rule_icmp_type:+--icmp-type $rule_icmp_type} \
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${rule_limit:+-m limit --limit $rule_limit \
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${rule_limit_burst:+--limit-burst $rule_limit_burst}} \
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$rule_extra \
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}
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done
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done
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done
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done
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done
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fw_callback post rule
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}
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@ -137,10 +137,13 @@ fw__exec() { # <action> <family> <table> <chain> <target> <position> { <rules> }
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case "$tgt" in
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-) tgt= ;;
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esac
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local rule_offset
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case "$pos" in
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^) pos=1 ;;
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$) pos= ;;
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-) pos= ;;
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+) eval "rule_offset=\${FW__RULE_OFS_${app}_${tab}_${chn}:-1}" ;;
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esac
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if ! fw__has - family || ! fw__has $tab ; then
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@ -159,13 +162,29 @@ fw__exec() { # <action> <family> <table> <chain> <target> <position> { <rules> }
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fi
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fi
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local cmdline="$app --table ${tab} --${cmd} ${chn} ${pol} ${pos} ${tgt:+--jump "$tgt"}"
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local cmdline="$app --table ${tab} --${cmd} ${chn} ${pol} ${rule_offset:-${pos}} ${tgt:+--jump "$tgt"}"
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while [ $# -gt 1 ]; do
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case "$app:$1" in
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ip6tables:--icmp-type) cmdline="$cmdline --icmpv6-type" ;;
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ip6tables:icmp|ip6tables:ICMP) cmdline="$cmdline icmpv6" ;;
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iptables:--icmpv6-type) cmdline="$cmdline --icmp-type" ;;
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iptables:icmpv6) cmdline="$cmdline icmp" ;;
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# special parameter handling
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case "$1:$2" in
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-p:icmp*|--protocol:icmp*)
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[ "$app" = ip6tables ] && \
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cmdline="$cmdline -p icmpv6" || \
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cmdline="$cmdline -p icmp"
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shift
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;;
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--icmp-type:*|--icmpv6-type:*)
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local icmp_type
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if [ "$app" = ip6tables ] && fw_check_icmptype6 icmp_type "$2"; then
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cmdline="$cmdline $icmp_type"
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elif [ "$app" = iptables ] && fw_check_icmptype4 icmp_type "$2"; then
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cmdline="$cmdline $icmp_type"
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else
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local fam=IPv4; [ "$app" = ip6tables ] && fam=IPv6
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fw_log info "ICMP type '$2' is not valid for $fam address family, skipping rule"
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return 1
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fi
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shift
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;;
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*) cmdline="$cmdline $1" ;;
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esac
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shift
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@ -175,7 +194,10 @@ fw__exec() { # <action> <family> <table> <chain> <target> <position> { <rules> }
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$cmdline
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fw__rc $?
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local rv=$?
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[ $rv -eq 0 ] && [ -n "$rule_offset" ] && \
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export -- "FW__RULE_OFS_${app}_${tab}_${chn}=$(($rule_offset + 1))"
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fw__rc $rv
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}
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fw_get_port_range() {
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@ -189,8 +211,8 @@ fw_get_port_range() {
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local _first=${_ports%-*}
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local _last=${_ports#*-}
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if [ "$_first" != "$_last" ]; then
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export -- "$_var=$_first$_delim$_last"
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if [ "${_first#!}" != "${_last#!}" ]; then
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export -- "$_var=$_first$_delim${_last#!}"
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else
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export -- "$_var=$_first"
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fi
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@ -221,11 +243,11 @@ fw_get_family_mode() {
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fw_get_negation() {
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local _var="$1"
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local _flag="$2"
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local _ipaddr="$3"
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local _value="$3"
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[ "${_ipaddr#!}" != "$_ipaddr" ] && \
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export -n -- "$_var=! $_flag ${_ipaddr#!}" || \
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export -n -- "$_var=${_ipaddr:+$_flag $_ipaddr}"
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[ "${_value#!}" != "$_value" ] && \
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export -n -- "$_var=! $_flag ${_value#!}" || \
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export -n -- "$_var=${_value:+$_flag $_value}"
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}
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fw_get_subnet4() {
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@ -245,3 +267,66 @@ fw_get_subnet4() {
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*) export -n -- "$_var=" ;;
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esac
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}
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fw_check_icmptype4() {
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local _var="$1"
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local _type="$2"
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case "$_type" in
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![0-9]*) export -n -- "$_var=! --icmp-type ${_type#!}"; return 0 ;;
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[0-9]*) export -n -- "$_var=--icmp-type $_type"; return 0 ;;
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esac
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[ -z "$FW_ICMP4_TYPES" ] && \
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export FW_ICMP4_TYPES=$(
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iptables -p icmp -h 2>/dev/null | \
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sed -n -e '/^Valid ICMP Types:/ {
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n; :r;
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/router-advertisement/d;
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/router-solicitation/d;
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s/[()]/ /g; s/[[:space:]]\+/\n/g; p; n; b r
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}' | sort -u
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)
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local _check
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for _check in $FW_ICMP4_TYPES; do
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if [ "$_check" = "${_type#!}" ]; then
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[ "${_type#!}" != "$_type" ] && \
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export -n -- "$_var=! --icmp-type ${_type#!}" || \
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export -n -- "$_var=--icmp-type $_type"
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return 0
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fi
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done
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export -n -- "$_var="
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return 1
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}
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fw_check_icmptype6() {
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local _var="$1"
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local _type="$2"
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case "$_type" in
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![0-9]*) export -n -- "$_var=! --icmpv6-type ${_type#!}"; return 0 ;;
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[0-9]*) export -n -- "$_var=--icmpv6-type $_type"; return 0 ;;
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esac
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[ -z "$FW_ICMP6_TYPES" ] && \
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export FW_ICMP6_TYPES=$(
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ip6tables -p icmpv6 -h 2>/dev/null | \
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sed -n -e '/^Valid ICMPv6 Types:/ {
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n; :r; s/[()]/ /g; s/[[:space:]]\+/\n/g; p; n; b r
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}' | sort -u
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)
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local _check
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for _check in $FW_ICMP6_TYPES; do
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if [ "$_check" = "${_type#!}" ]; then
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[ "${_type#!}" != "$_type" ] && \
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export -n -- "$_var=! --icmpv6-type ${_type#!}" || \
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export -n -- "$_var=--icmpv6-type $_type"
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return 0
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fi
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done
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|
||||
export -n -- "$_var="
|
||||
return 1
|
||||
}
|
||||
|
|
|
|||
|
|
@ -56,6 +56,7 @@ if [ "$ACTION" = "add" ] && [ "$INTERFACE" = "wan" ]; then
|
|||
[ "$src" = wan ] && [ "$target" = DNAT ] && {
|
||||
local dest
|
||||
config_get dest "$cfg" dest "lan"
|
||||
[ "$dest" != "*" ] || return
|
||||
|
||||
local net
|
||||
for net in $(find_networks "$dest"); do
|
||||
|
|
|
|||
Loading…
Reference in a new issue