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have nsd bind to the network interaface that is connected to the Internet, rather than all non-loopback network interfaces
hopefully fixes #121; thanks for the help @sfPlayer1
This commit is contained in:
Joshua Tauberer
parent
c74bef12d2
commit
168c06939d
@ -104,7 +104,7 @@ def do_dns_update(env):
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zonefiles[i][1] += ".signed"
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# Write the main nsd.conf file.
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if write_nsd_conf(zonefiles):
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if write_nsd_conf(zonefiles, env):
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# Make sure updated_domains contains *something* if we wrote an updated
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# nsd.conf so that we know to restart nsd.
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if len(updated_domains) == 0:
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@ -383,7 +383,7 @@ $TTL 86400 ; default time to live
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########################################################################
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def write_nsd_conf(zonefiles):
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def write_nsd_conf(zonefiles, env):
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# Basic header.
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nsdconf = """
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server:
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@ -397,15 +397,13 @@ server:
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"""
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# Since we have bind9 listening on localhost for locally-generated
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# DNS queries that require a recursive nameserver, we must have
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# nsd listen only on public network interfaces. Those interfaces
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# may have addresses different from the public IP address that the
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# Internet sees this machine on. Get those interface addresses
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# from `hostname -i` (which omits all localhost addresses).
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for ipaddr in shell("check_output", ["/bin/hostname", "-I"]).strip().split(" "):
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# DNS queries that require a recursive nameserver, and the system
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# might have other network interfaces for e.g. tunnelling, we have
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# to be specific about the network interfaces that nsd binds to.
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for ipaddr in (env.get("PRIVATE_IP", "") + " " + env.get("PRIVATE_IPV6", "")).split(" "):
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if ipaddr == "": continue
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nsdconf += " ip-address: %s\n" % ipaddr
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# Append the zones.
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for domain, zonefile in zonefiles:
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nsdconf += """
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@ -77,62 +77,58 @@ function get_default_publicip {
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# API, but if that fails (maybe we don't have Internet access
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# right now) then use the IP address that this machine knows
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# itself as.
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get_publicip_from_web_service || get_publicip_fallback
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get_publicip_from_web_service 4 || get_default_privateip 4
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}
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function get_default_publicipv6 {
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get_publicipv6_from_web_service || get_publicipv6_fallback
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get_publicip_from_web_service 6 || get_default_privateip 6
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}
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function get_publicip_from_web_service {
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# This seems to be the most reliable way to determine the
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# machine's public IP address: asking a very nice web API
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# for how they see us. Thanks go out to icanhazip.com.
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curl -4 --fail --silent icanhazip.com 2>/dev/null
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# See: https://major.io/icanhazip-com-faq/
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#
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# Pass '4' or '6' as an argument to this function to specify
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# what type of address to get (IPv4, IPv6).
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curl -$1 --fail --silent icanhazip.com 2>/dev/null
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}
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function get_publicipv6_from_web_service {
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curl -6 --fail --silent icanhazip.com 2>/dev/null
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}
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function get_default_privateip {
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# Return the IP address of the network interface connected
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# to the Internet.
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#
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# We used to use `hostname -I` and then filter for either
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# IPv4 or IPv6 addresses. However if there are multiple
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# network interfaces on the machine, not all may be for
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# reaching the Internet.
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#
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# Instead use `ip route get` which asks the kernel to use
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# the system's routes to select which interface would be
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# used to reach a public address. We'll use 8.8.8.8 as
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# the destination. It happens to be Google Public DNS, but
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# no connection is made. We're just seeing how the box
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# would connect to it. There many be multiple IP addresses
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# assigned to an interface. `ip route get` reports the
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# preferred. That's good enough for us. See issue #121.
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#
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# Also see ae67409603c49b7fa73c227449264ddd10aae6a9 and
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# issue #3 for why/how we originally added IPv6.
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#
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# Pass '4' or '6' as an argument to this function to specify
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# what type of address to get (IPv4, IPv6).
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function get_publicip_fallback {
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# Return the IP address that this machine knows itself as.
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# It certainly may not be the IP address that this machine
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# operates as on the public Internet. The machine might
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# have multiple addresses if it has multiple network adapters.
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set -- $(hostname --ip-address 2>/dev/null) \
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$(hostname --all-ip-addresses 2>/dev/null)
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while (( $# )) && { ! is_ipv4 "$1" || is_loopback_ip "$1"; }; do
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shift
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done
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printf '%s\n' "$1" # return this value
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}
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target=8.8.8.8
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function get_publicipv6_fallback {
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set -- $(hostname --ip-address 2>/dev/null) \
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$(hostname --all-ip-addresses 2>/dev/null)
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while (( $# )) && { ! is_ipv6 "$1" || is_loopback_ipv6 "$1"; }; do
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shift
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done
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printf '%s\n' "$1" # return this value
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}
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# For the IPv6 route, use the corresponding IPv6 address
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# of Google Public DNS. Again, it doesn't matter so long
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# as it's an address on the public Internet.
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if [ "$1" == "6" ]; then target=2001:4860:4860::8888; fi
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function is_ipv4 {
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# helper for get_publicip_fallback
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[[ "$1" == *.*.*.* ]]
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}
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function is_ipv6 {
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[[ "$1" == *:*:* ]]
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}
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function is_loopback_ip {
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# helper for get_publicip_fallback
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[[ "$1" == 127.* ]]
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}
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function is_loopback_ipv6 {
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[[ "$1" == ::1 ]]
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ip -$1 -o route get $target \
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| grep -v unreachable \
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| sed "s/.* src \([^ ]*\).*/\1/"
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}
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function ufw_allow {
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@ -136,6 +136,26 @@ if [ -z "$PUBLIC_IPV6" ]; then
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read -e -i "$DEFAULT_PUBLIC_IPV6" -p "Public IPv6: " PUBLIC_IPV6
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fi
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# Get the IP addresses of the local network interface(s) that are connected
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# to the Internet. We need these when we want to have services bind only to
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# the public network interfaces (not loopback, not tunnel interfaces).
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if [ -z "$PRIVATE_IP" ]; then
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PRIVATE_IP=$(get_default_privateip 4)
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fi
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if [ -z "$PRIVATE_IPV6" ]; then
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PRIVATE_IPV6=$(get_default_privateip 6)
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fi
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if [[ -z "$PRIVATE_IP" && -z "$PRIVATE_IPV6" ]]; then
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echo
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echo "I could not determine the IP or IPv6 address of the network inteface"
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echo "for connecting to the Internet. Setup must stop."
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echo
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hostname -I
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route
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echo
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exit
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fi
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# We need a country code to generate a certificate signing request. However
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# if a CSR already exists then we won't be generating a new one and there's
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# no reason to ask for the country code now. $STORAGE_ROOT has not yet been
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@ -199,6 +219,8 @@ STORAGE_ROOT=$STORAGE_ROOT
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PRIMARY_HOSTNAME=$PRIMARY_HOSTNAME
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PUBLIC_IP=$PUBLIC_IP
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PUBLIC_IPV6=$PUBLIC_IPV6
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PRIVATE_IP=$PRIVATE_IP
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PRIVATE_IPV6=$PRIVATE_IPV6
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CSR_COUNTRY=$CSR_COUNTRY
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MIGRATIONID=$MIGRATIONID
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EOF
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