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281 lines
11 KiB
Plaintext
281 lines
11 KiB
Plaintext
4 years ago
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#
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# Copyright 2018 devolo AG
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#
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SCRIPT=/usr/sbin/wifi_guest.sh
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_rm_cron_script(){
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crontab -l | grep -v "$1" | sort -u | crontab -
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}
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_rm_and_add_cron_script(){
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(crontab -l | grep -v "$1"; [ -n "$2" ] && echo "$2") | sort -u | crontab -
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}
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set_delos_guestwifi() {
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#local EBLOG=--log
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# determine new guest interfaces (from tmpfile written by a wifi hook)
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[ -f /tmp/guestwifi-ifs ] && . /tmp/guestwifi-ifs || GUEST_IFS=
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# determine new GW addresses (from tmpfile written by a dhcp hook)
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[ -f /tmp/guestwifi-ipv4 ] && . /tmp/guestwifi-ipv4 || GW4_IP= GW4_MAC=
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[ -f /tmp/guestwifi-ipv6 ] && . /tmp/guestwifi-ipv6 || GW6_IP= GW6_MAC=
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# read saved interfaces and GW addresses of the installed rules
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[ -f /var/run/guest-wifi-restricted ] && . /var/run/guest-wifi-restricted ||
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CUR_GUEST_IFS= CUR_GW4_IP= CUR_GW4_MAC= CUR_GW6_IP= CUR_GW6_MAC=
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# check if new parameters are same as last used
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[ "$GUEST_IFS/$GW4_IP/$GW4_MAC/$GW6_IP/$GW6_MAC" = "$CUR_GUEST_IFS/$CUR_GW4_IP/$CUR_GW4_MAC/$CUR_GW6_IP/$CUR_GW6_MAC" ] &&
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return
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# reinstall rules only if changed
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# throw away current user-defined chains
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for iface in $CUR_GUEST_IFS; do
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ebtables -D INPUT -i $iface -j i-guestwifi $EBLOG 2>/dev/null
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ebtables -D OUTPUT -o $iface -j o-guestwifi $EBLOG 2>/dev/null
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ebtables -D FORWARD -i $iface -j fi-guestwifi $EBLOG 2>/dev/null
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ebtables -D FORWARD -o $iface -j fo-guestwifi $EBLOG 2>/dev/null
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done
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ebtables -X i-guestwifi 2>/dev/null
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ebtables -X o-guestwifi 2>/dev/null
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ebtables -X fi-guestwifi 2>/dev/null
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ebtables -X fo-guestwifi 2>/dev/null
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# but don't install new rules when there are no restricted interfaces
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[ -z "$GUEST_IFS" ] && {
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rm -f /var/run/guest-wifi-restricted
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return
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}
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# use user-defined chains to group rules for easier deletion
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ebtables -N i-guestwifi -P RETURN
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ebtables -N o-guestwifi -P RETURN
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ebtables -N fi-guestwifi -P RETURN
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ebtables -N fo-guestwifi -P RETURN
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for iface in $GUEST_IFS; do
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ebtables -A INPUT -i $iface -j i-guestwifi $EBLOG 2>/dev/null
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ebtables -A OUTPUT -o $iface -j o-guestwifi $EBLOG 2>/dev/null
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ebtables -A FORWARD -i $iface -j fi-guestwifi $EBLOG 2>/dev/null
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ebtables -A FORWARD -o $iface -j fo-guestwifi $EBLOG 2>/dev/null
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done
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# save current rule parameters for later
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cat >/var/run/guest-wifi-restricted <<-EOF
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CUR_GUEST_IFS="$GUEST_IFS"
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CUR_GW4_IP="$GW4_IP"
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CUR_GW4_MAC="$GW4_MAC"
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CUR_GW6_IP="$GW6_IP"
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CUR_GW6_MAC="$GW6_MAC"
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EOF
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# actual rules
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# We return but don't accept so that more chains after ours are considered
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#allow EAPOL frames destined to the adapter itself (needed for wifi authentication)
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ebtables -A i-guestwifi -p 0x888e -j RETURN $EBLOG
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#allow ARP frames destinated to the adapter itself
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ebtables -A i-guestwifi -p ARP -j RETURN $EBLOG
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#deny any other frame destined to the adapter itself
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# TODO use DROP policy instead of using this rule as the last one everywhere!?
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ebtables -A i-guestwifi -j DROP $EBLOG
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#allow EAPOL frames originating from the adapter itself (needed for wifi authentication)
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ebtables -A o-guestwifi -p 0x888e -j RETURN $EBLOG
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#allow ARP frames originationg from the adapter itself
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ebtables -A o-guestwifi -p ARP -j RETURN $EBLOG
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#deny any frame originating from the adapter itself being destined to a guest account station
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ebtables -A o-guestwifi -j DROP $EBLOG
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# some IP-based restrictions to strengthen security
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# FIXME what if no MAC? leave it out and use IP only?
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[ -n "$GW4_IP" ] && {
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#allow DHCP, DNS and ICMP unicast packets destined to the current default gateway
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ebtables -A fi-guestwifi -d $GW4_MAC -p IPv4 --ip-dst $GW4_IP --ip-proto tcp --ip-dport 53 -j RETURN $EBLOG
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ebtables -A fi-guestwifi -d $GW4_MAC -p IPv4 --ip-dst $GW4_IP --ip-proto udp --ip-dport 53 -j RETURN $EBLOG
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ebtables -A fi-guestwifi -d $GW4_MAC -p IPv4 --ip-dst $GW4_IP --ip-proto udp --ip-dport 67 -j RETURN $EBLOG
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ebtables -A fi-guestwifi -d $GW4_MAC -p IPv4 --ip-dst $GW4_IP --ip-proto icmp -j RETURN $EBLOG
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#deny any other IP unicast packets destined to the current default gateway
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ebtables -A fi-guestwifi -d $GW4_MAC -p IPv4 --ip-dst $GW4_IP -j DROP $EBLOG
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}
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#allow DHCP broadcast packets originating from a guest account station
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ebtables -A fi-guestwifi -p IPv4 --ip-dst 255.255.255.255 --ip-proto udp --ip-dport 67 -j RETURN $EBLOG
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#deny any other IP broadcast packets originating from a guest account station
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ebtables -A fi-guestwifi -p IPv4 --ip-dst 255.255.255.255 -j DROP $EBLOG
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[ -n "$GW4_IP" ] && {
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#allow DHCP, DNS and ICMP packets originating from the current default gateway
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ebtables -A fo-guestwifi -s $GW4_MAC -p IPv4 --ip-src $GW4_IP --ip-proto tcp --ip-sport 53 -j RETURN $EBLOG
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ebtables -A fo-guestwifi -s $GW4_MAC -p IPv4 --ip-src $GW4_IP --ip-proto udp --ip-sport 53 -j RETURN $EBLOG
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ebtables -A fo-guestwifi -s $GW4_MAC -p IPv4 --ip-src $GW4_IP --ip-proto udp --ip-sport 67 -j RETURN $EBLOG
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ebtables -A fo-guestwifi -s $GW4_MAC -p IPv4 --ip-src $GW4_IP --ip-proto icmp -j RETURN $EBLOG
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#deny any other IP packets originating from the current default gateway
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ebtables -A fo-guestwifi -s $GW4_MAC -p IPv4 --ip-src $GW4_IP -j DROP $EBLOG
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}
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#if GW6_IP isn't known then deny all IPv6 frames originating from or destined to a guest account station
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[ -z "$GW6_IP" ] && {
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ebtables -A fo-guestwifi -p IPv6 -j DROP $EBLOG
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ebtables -A fi-guestwifi -p IPv6 -j DROP $EBLOG
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}
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# some IPv6-based restrictions to strengthen security
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[ -n "$GW6_IP" ] && {
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#allow DNS packets destined to the current default gateway
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ebtables -A fi-guestwifi -d $GW6_MAC -p IPv6 --ip6-dst $GW6_IP --ip6-proto tcp --ip6-dport 53 -j RETURN $EBLOG
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ebtables -A fi-guestwifi -d $GW6_MAC -p IPv6 --ip6-dst $GW6_IP --ip6-proto udp --ip6-dport 53 -j RETURN $EBLOG
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#allow DHCPv6 packets (using multicast)
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ebtables -A fi-guestwifi -p IPv6 --ip6-proto udp --ip6-sport 546 --ip6-dport 547 -j RETURN $EBLOG
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#allow ipv6-icmp type router-solicitation, router-advertisement, neighbour-solicitation, neighbour-advertisement
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ebtables -A fi-guestwifi -p IPv6 --ip6-proto ipv6-icmp --ip6-icmp-type router-solicitation -j RETURN $EBLOG
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ebtables -A fi-guestwifi -p IPv6 --ip6-proto ipv6-icmp --ip6-icmp-type router-advertisement -j RETURN $EBLOG
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ebtables -A fi-guestwifi -p IPv6 --ip6-proto ipv6-icmp --ip6-icmp-type neighbour-solicitation -j RETURN $EBLOG
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ebtables -A fi-guestwifi -p IPv6 --ip6-proto ipv6-icmp --ip6-icmp-type neighbour-advertisement -j RETURN $EBLOG
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#deny any other IPv6 packets destined to the current default gateway
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ebtables -A fi-guestwifi -d $GW6_MAC -p IPv6 --ip6-dst $GW6_IP -j DROP $EBLOG
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}
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[ -n "$GW6_IP" ] && {
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#allow DNS packets originating from the current default gateway
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ebtables -A fo-guestwifi -s $GW6_MAC -p IPv6 --ip6-src $GW6_IP --ip6-proto tcp --ip6-sport 53 -j RETURN $EBLOG
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ebtables -A fo-guestwifi -s $GW6_MAC -p IPv6 --ip6-src $GW6_IP --ip6-proto udp --ip6-sport 53 -j RETURN $EBLOG
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#allow DHCPv6 reply packets
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ebtables -A fo-guestwifi -p IPv6 --ip6-proto udp --ip6-sport 547 --ip6-dport 546 -j RETURN $EBLOG
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#allow ipv6-icmp type router-solicitation, router-advertisement, neighbour-solicitation, neighbour-advertisement
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ebtables -A fo-guestwifi -p IPv6 --ip6-proto ipv6-icmp --ip6-icmp-type router-solicitation -j RETURN $EBLOG
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ebtables -A fo-guestwifi -p IPv6 --ip6-proto ipv6-icmp --ip6-icmp-type router-advertisement -j RETURN $EBLOG
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ebtables -A fo-guestwifi -p IPv6 --ip6-proto ipv6-icmp --ip6-icmp-type neighbour-solicitation -j RETURN $EBLOG
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ebtables -A fo-guestwifi -p IPv6 --ip6-proto ipv6-icmp --ip6-icmp-type neighbour-advertisement -j RETURN $EBLOG
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#deny any other IP packets originating from the current default gateway
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ebtables -A fo-guestwifi -s $GW6_MAC -p IPv6 --ip6-src $GW6_IP -j DROP $EBLOG
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}
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#allow all broadcast frames transporting plausible protocols for Internet usage (e.g. no MMEs)
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ebtables -A fi-guestwifi -p ARP -d FF:FF:FF:FF:FF:FF -j RETURN $EBLOG
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ebtables -A fi-guestwifi -p IPv4 -d FF:FF:FF:FF:FF:FF -j RETURN $EBLOG
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#allow all frames destined to the current default gateway (and thus, most likely to the Internet)
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[ -n "$GW4_MAC" ] && {
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ebtables -A fi-guestwifi -d $GW4_MAC -j RETURN $EBLOG
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}
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[ -n "$GW6_MAC" ] && {
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ebtables -A fi-guestwifi -d $GW6_MAC -j RETURN $EBLOG
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}
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#deny all frames originating from a guest account station, that have not been allowed already
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ebtables -A fi-guestwifi -j DROP $EBLOG
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#allow all frames originating from the current default gateway destined to a guest account station
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[ -n "$GW4_MAC" ] && {
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ebtables -A fo-guestwifi -s $GW4_MAC -j RETURN $EBLOG
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}
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[ -n "$GW6_MAC" ] && {
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ebtables -A fo-guestwifi -s $GW6_MAC -j RETURN $EBLOG
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}
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#deny all still unallowed frames destined to a guest account station
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ebtables -A fo-guestwifi -j DROP $EBLOG
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}
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delos_wifi_guest_timer() {
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local auto_switch_off=
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config_get_bool auto_switch_off guest_wifi auto_switch_off 0
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if [ "$auto_switch_off" = "1" ]; then
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local starttime=
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local stoptime=
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local interval=
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config_get interval guest_wifi interval '00:30'
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config_get starttime guest_wifi starttime
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if [ -n "$starttime" -a ${interval//:} -gt 0 ]; then
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stoptime=$(($starttime + $(echo $interval | awk -F: '{ print ($1 * 3600) + ($2 * 60) + 60 }')))
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_rm_and_add_cron_script "${SCRIPT}" "$(date -D %s -d ${stoptime} "+%M %H %d %m %a ${SCRIPT} stop")"
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fi
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else
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_rm_cron_script "${SCRIPT}"
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fi
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}
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delos_wifi_guest_post() {
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local action=$1; shift # enable/disable
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local iface_list
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local ifname
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case "$action" in
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enable)
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check_access() {
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# check guest wifi restriction option
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[ "$(config_get $1 disabled)" != "1" ] &&
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[ "$(config_get $(config_get $1 device) disabled)" != "1" ] &&
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[ "$(config_get $1 dvl_guest)" = "1" ] || return
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local dvl_unrestricted_access
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config_get dvl_unrestricted_access $1 dvl_unrestricted_access 0
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[ "$dvl_unrestricted_access" = "0" ] &&
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ifname=$(uci_get_state wireless $1 ifname 2>/dev/null) &&
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echo $ifname
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}
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iface_list=$(config_foreach check_access wifi-iface | sort)
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iface_list="$(echo $iface_list)"
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delos_wifi_guest_timer
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;;
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disable)
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iface_list=
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;;
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*)
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return
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;;
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esac
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if [ -n "$iface_list" ]; then (
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# subshell for new trap context
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TMP=
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trap '[ -n "$TMP" ] && rm -f "$TMP"; TMP=' EXIT HUP INT QUIT TERM
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TMP=$(mktemp)
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cat >$TMP <<-EOF
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GUEST_IFS="$iface_list"
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EOF
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# if changed:
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cmp -s /tmp/guestwifi-ifs $TMP || {
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mv $TMP /tmp/guestwifi-ifs
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TMP=
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( set_delos_guestwifi )
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}
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) else
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# if removed:
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rm /tmp/guestwifi-ifs 2>/dev/null && {
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( set_delos_guestwifi )
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}
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fi
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}
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# is DELOS_WIFI_DRIVERS defined at all (empty or non-empty)? (force exit code 0 if empty,
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# don't exit current script if not defined)
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if (: ${DELOS_WIFI_DRIVERS?}) 2>/dev/null; then
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# we were sourced to register as a plugin
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delos_wifi_driver_guest() {
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type=$1; shift
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type delos_wifi_guest_$type >/dev/null 2>/dev/null && delos_wifi_guest_$type "$@"
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}
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append DELOS_WIFI_DRIVERS delos_wifi_driver_guest
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fi
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