unbound: bugfix init race condition invalid FQDN
options 'add_local_fqdn' and 'add_wan_fqdn' can be affected by race conditions when they are at level 4. Interface name may not be returned by network tools. The conf file has bad record formats and Unbound just will not load. Detect this and fall back to only the host FQDN (level 3). squash: improve documentation wording and format codes. Signed-off-by: Eric Luehrsen <ericluehrsen@hotmail.com>
This commit is contained in:
Eric Luehrsen
parent
0413f84f28
commit
ab0be4f26c
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@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
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PKG_NAME:=unbound
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PKG_VERSION:=1.6.1
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PKG_RELEASE:=2
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PKG_RELEASE:=3
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PKG_LICENSE:=BSD-3-Clause
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PKG_LICENSE_FILES:=LICENSE
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@ -1,15 +1,15 @@
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# Unbound Recursive DNS Server with UCI
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## Unbound Description
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Unbound is a validating, recursive, and caching DNS resolver. The C implementation of Unbound is developed and maintained by [NLnet Labs](https://www.unbound.net/). It is based on ideas and algorithms taken from a java prototype developed by Verisign labs, Nominet, Kirei and ep.net. Unbound is designed as a set of modular components, so that also DNSSEC (secure DNS) validation and stub-resolvers (that do not run as a server, but are linked into an application) are easily possible.
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[Unbound](https://www.unbound.net/) is a validating, recursive, and caching DNS resolver. The C implementation of Unbound is developed and maintained by [NLnet Labs](https://www.nlnetlabs.nl/). It is based on ideas and algorithms taken from a java prototype developed by Verisign labs, Nominet, Kirei and ep.net. Unbound is designed as a set of modular components, so that also DNSSEC (secure DNS) validation and stub-resolvers (that do not run as a server, but are linked into an application) are easily possible.
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## Package Overview
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Unbound may be useful on consumer grade embedded hardware. It is *intended* to be a recursive resolver only. [NLnet Labs NSD](https://www.nlnetlabs.nl/projects/nsd/) is *intended* for the authoritative task. This is different than [ISC Bind](https://www.isc.org/downloads/bind/) and its inclusive functions. Unbound configuration effort and memory consumption may be easier to control. A consumer could have their own recursive resolver, and remove potential issues from forwarding resolvers outside of their control.
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Unbound may be useful on consumer grade embedded hardware. It is _intended_ to be a recursive resolver only. [NLnet Labs NSD](https://www.nlnetlabs.nl/projects/nsd/) is _intended_ for the authoritative task. This is different than [ISC Bind](https://www.isc.org/downloads/bind/) and its inclusive functions. Unbound configuration effort and memory consumption may be easier to control. A consumer could have their own recursive resolver with 8/64 MB router, and remove potential issues from forwarding resolvers outside of their control.
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This package builds on Unbounds capabilities with OpenWrt UCI. Not every Unbound option is in UCI, but rather, UCI simplifies the combination of related options. Unbounds native options are bundled and balanced within a smaller set of choices. Options include resources, DNSSEC, access control, and some TTL tweaking. The UCI also provides an escape option and work at the raw "unbound.conf" level.
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## Adblocking
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The UCI scripts will work with OpenWrt/pacakages/net/adblock (2.3.0 and above) if it is installed and enabled. Its all detected and integrated automatically. In brief, the adblock scripts create distinct local-zone files that are simply included in the unbound conf file during UCI generation. If you don't want this, then disable adblock or reconfigure adblock to not send these files to Unbound.
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## HOW TO Adblocking
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The UCI scripts will work with [net/adblock 2.3+](https://github.com/openwrt/packages/blob/master/net/adblock/files/README.md), if it is installed and enabled. Its all detected and integrated automatically. In brief, the adblock scripts create distinct local-zone files that are simply included in the unbound conf file during UCI generation. If you don't want this, then disable adblock or reconfigure adblock to not send these files to Unbound.
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## HOW TO Integrate with DHCP
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Some UCI options and scripts help Unbound to work with DHCP servers to load the local DNS. The examples provided here are serial dnsmasq-unbound, parallel dnsmasq-unbound, and unbound scripted with odhcpd.
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@ -19,93 +19,105 @@ In this case, dnsmasq is not changed *much* with respect to the default OpenWRT/
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**/etc/config/unbound**:
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config unbound
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option add_local_fqdn '0'
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option add_wan_fqdn '0'
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option dhcp_link 'none'
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# dnsmasq should not forward your domain to unbound, but if...
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option domain 'yourdomain'
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option domain_type 'refuse'
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option listen_port '1053'
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...
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```
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config unbound
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option add_local_fqdn '0'
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option add_wan_fqdn '0'
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option dhcp_link 'none'
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# dnsmasq should not forward your domain to unbound, but if...
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option domain 'yourdomain'
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option domain_type 'refuse'
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option listen_port '1053'
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...
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```
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**/etc/config/dhcp**:
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config dnsmasq
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option domain 'yourdomain'
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option noresolv '1'
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option resolvfile '/tmp/resolv.conf.auto'
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option port '53'
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list server '127.0.0.1#1053'
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list server '::1#1053'
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...
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```
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config dnsmasq
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option domain 'yourdomain'
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option noresolv '1'
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option resolvfile '/tmp/resolv.conf.auto'
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option port '53'
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list server '127.0.0.1#1053'
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list server '::1#1053'
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...
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```
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### Parallel dnsmasq
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In this case, Unbound serves your local network directly for all purposes. It will look over to dnsmasq for DHCP-DNS resolution. Unbound is generally accessible on port 53, and dnsmasq is only accessed at 127.0.0.1:1053 by Unbound. Although you can dig/drill/nslookup remotely with the proper directives.
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**/etc/config/unbound**:
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config unbound
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option dhcp_link 'dnsmasq'
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option listen_port '53'
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...
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```
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config unbound
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option dhcp_link 'dnsmasq'
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option listen_port '53'
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...
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```
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**/etc/config/dhcp**:
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config dnsmasq
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option domain 'yourdomain'
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option noresolv '1'
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option resolvfile '/tmp/resolv.conf.auto'
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option port '1053'
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...
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```
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config dnsmasq
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option domain 'yourdomain'
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option noresolv '1'
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option resolvfile '/tmp/resolv.conf.auto'
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option port '1053'
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...
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config dhcp 'lan'
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# dnsmasq may not issue DNS option if not std. configuration
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list dhcp_option 'option:dns-server,0.0.0.0'
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...
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config dhcp 'lan'
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# dnsmasq may not issue DNS option if not std. configuration
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list dhcp_option 'option:dns-server,0.0.0.0'
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...
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```
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### Only odhcpd
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Why use dnsmasq you might ask? Well test, try, and review. You can have Unbound and odhcpd only. When odhcpd configures each DHCP lease, it will call a script. The script provided with Unbound will read the lease file and enter DHCP-DNS records as much as dnsmasq once did. You **must install** `unbound-control`, because the lease records are added and removed without starting, stopping, flushing cache, or re-writing conf files.
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### Unbound and odhcpd
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You may ask can Unbound replace dnsmasq? You can have DHCP-DNS records with Unbound and odhcpd only. The UCI scripts will allow Unbound to act like dnsmasq. When odhcpd configures each DHCP lease, it will call a script. The script provided with Unbound will read the lease file for DHCP-DNS records. You **must install** `unbound-control`, because the lease records are added and removed without starting, stopping, flushing cache, or re-writing conf files. (_restart overhead can be excessive with even a few mobile devices._)
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*note: if you run the default LEDE/OpenWrt setup with dnsmasq and odhcpd, then use the link to dnsmasq. Unbound will pole dnsmasq. dnsmasq merges its lease file and odhcpd lease file.*
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Don't forget to disable or uninstall dnsmasq when you don't intend to use it. Strange results may occur. If you want to use default dnsmasq+odhcpd and add Unbound on top, then use the dnsmasq-serial or dnsmasq-parallel methods above.
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**/etc/config/unbound**:
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config unbound
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# name your router in DNS
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option add_local_fqdn '1'
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option add_wan_fqdn '1'
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option dhcp_link 'odhcpd'
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# add SLAAC inferred from DHCPv4
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option dhcp4_slaac6 '1'
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option domain 'lan'
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option domain_type 'static'
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option listen_port '53'
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option rebind_protection '1'
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# install unbound-control and set this
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option unbound_control '1'
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...
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```
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config unbound
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# name your router in DNS
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option add_local_fqdn '1'
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option add_wan_fqdn '1'
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option dhcp_link 'odhcpd'
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# add SLAAC inferred from DHCPv4
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option dhcp4_slaac6 '1'
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option domain 'lan'
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option domain_type 'static'
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option listen_port '53'
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option rebind_protection '1'
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# install unbound-control and set this
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option unbound_control '1'
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...
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```
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**/etc/config/dhcp**:
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config dhcp 'lan'
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option dhcpv4 'server'
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option dhcpv6 'server'
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option interface 'lan'
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# short times help renew events to refresh dns
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option leasetime '4h'
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option ra 'server'
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option ra_management '1'
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# issue your ULA and avoid default [fe80::]
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list dns 'fdxx:xxxx:xxxx::1'
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```
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config dhcp 'lan'
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option dhcpv4 'server'
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option dhcpv6 'server'
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option interface 'lan'
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option leasetime '12h'
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option ra 'server'
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option ra_management '1'
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# issue your ULA and avoid default [fe80::]
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list dns 'fdxx:xxxx:xxxx::1'
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...
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config odhcpd 'odhcpd'
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option maindhcp '1'
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option leasefile '/var/lib/odhcpd/dhcp.leases'
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# this is where the magic happens
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option leasetrigger '/usr/lib/unbound/odhcpd.sh'
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config odhcpd 'odhcpd'
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option maindhcp '1'
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option leasefile '/var/lib/odhcpd/dhcp.leases'
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# this is where the magic happens
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option leasetrigger '/usr/lib/unbound/odhcpd.sh'
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```
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## Back to Manual Configuration
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## HOW TO Manual Override
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Yes, there is a UCI to disable the rest of Unbound UCI. However, OpenWrt or LEDE are targeted at embedded machines with flash ROM. The initialization scripts do a few things to protect flash ROM.
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### Completely Manual (almost)
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@ -115,150 +127,153 @@ Keep the DNSKEY updated with your choice of flash activity. `root.key` maintenan
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**/etc/config/unbound**:
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config unbound
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option manual_conf '1'
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option root_age '9'
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```
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config unbound
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option manual_conf '1'
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option root_age '9'
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# end
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```
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### Hybrid Manual/UCI
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You like the UCI. Yet, you need to add some difficult to standardize options, or just are not ready to make a UCI request yet. The files `/etc/unbound/unbound_srv.conf` and `/etc/unbound/unbound_ext.conf` will be copied to Unbounds chroot directory and included during auto generation.
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You like the UCI. Yet, you need to add some difficult to standardize options, or just are not ready to make a UCI request yet. The files `/etc/unbound/unbound_srv.conf` and `/etc/unbound/unbound_ext.conf` will be copied to Unbounds chroot directory and included during auto generation.
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The former will be added to the end of the `server:` clause. The later will be added to the end of the file for extended `forward:` and `view:` clauses. You can also disable unbound-control in the UCI which only allows "localhost" connections unencrypted, and then add an encrypted remote `control:` clause.
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## Complete List of UCI Options
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**/etc/config/unbound**:
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config unbound
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Currently only one instance is supported.
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```
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config unbound
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Currently only one instance is supported.
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option add_local_fqdn '0'
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Level. This puts your routers host name in the LAN (local) DNS.
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Each level is more detailed and comprehensive.
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0 - Disabled
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1 - Host Name on only the primary address
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2 - Host Name on all addresses found (except link)
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3 - FQDN and host name on all addresses (except link)
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4 - Above and interfaces named <iface>.<hostname>.<domain>
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option add_local_fqdn '0'
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Level. This puts your routers host name in the LAN (local) DNS.
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Each level is more detailed and comprehensive.
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0 - Disabled
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1 - Host Name on only the primary address
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2 - Host Name on all addresses found (except link)
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3 - FQDN and host name on all addresses (except link)
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4 - Above and interfaces named <iface>.<hostname>.<domain>
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option add_wan_fqdn '0'
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Level. Same as previous option only this applies to the WAN. WAN
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are inferred by a UCI `config dhcp` entry that contains the line
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option ignore '1'.
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option add_wan_fqdn '0'
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Level. Same as previous option only this applies to the WAN. WAN
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are inferred by a UCI `config dhcp` entry that contains the line
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option ignore '1'.
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option dns64 '0'
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Boolean. Enable DNS64 through Unbound in order to bridge networks
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that are IPV6 only and IPV4 only (see RFC6052).
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option dns64 '0'
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Boolean. Enable DNS64 through Unbound in order to bridge networks
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that are IPV6 only and IPV4 only (see RFC6052).
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option dns64_prefix '64:ff9b::/96'
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IPV6 Prefix. The IPV6 prefix wrapped on the IPV4 address for DNS64.
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You should use RFC6052 "well known" address, unless you also
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redirect to a proxy or gateway for your NAT64.
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option dns64_prefix '64:ff9b::/96'
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IPV6 Prefix. The IPV6 prefix wrapped on the IPV4 address for DNS64.
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You should use RFC6052 "well known" address, unless you also
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redirect to a proxy or gateway for your NAT64.
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option dhcp_link 'none'
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Program Name. Link to one of the supported programs we have scripts
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for. You may also need to install a trigger script in the DHCP
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servers configuration. See HOW TO above.
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option dhcp_link 'none'
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Program Name. Link to one of the supported programs we have scripts
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for. You may also need to install a trigger script in the DHCP
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servers configuration. See HOW TO above.
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option dhcp4_slaac6 '0'
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Boolean. Some DHCP servers do this natively (dnsmasq). Otherwise
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the script provided with this package will try to fabricate SLAAC
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IP6 addresses from DHCPv4 MAC records.
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option dhcp4_slaac6 '0'
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Boolean. Some DHCP servers do this natively (dnsmasq). Otherwise
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the script provided with this package will try to fabricate SLAAC
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IP6 addresses from DHCPv4 MAC records.
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option domain 'lan'
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Unbound local-zone: <domain> <type>. This is used to suffix all
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host records, and maintain a local zone. When dnsmasq is dhcp_link
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however, then this option is ignored (dnsmasq does it all).
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option domain 'lan'
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Unbound local-zone: <domain> <type>. This is used to suffix all
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host records, and maintain a local zone. When dnsmasq is dhcp_link
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however, then this option is ignored (dnsmasq does it all).
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option domain_type 'static'
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Unbound local-zone: <domain> <type>. This allows you to lock
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down or allow forwarding of your domain, your router host name
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without suffix, and leakage of RFC6762 "local."
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option domain_type 'static'
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Unbound local-zone: <domain> <type>. This allows you to lock
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down or allow forwarding of your domain, your router host name
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without suffix, and leakage of RFC6762 "local."
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option edns_size '1280'
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Bytes. Extended DNS is necessary for DNSSEC. However, it can run
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into MTU issues. Use this size in bytes to manage drop outs.
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option edns_size '1280'
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Bytes. Extended DNS is necessary for DNSSEC. However, it can run
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into MTU issues. Use this size in bytes to manage drop outs.
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option hide_binddata '1'
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Boolean. If enabled version.server, version.bind, id.server, and
|
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hostname.bind queries are refused.
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option hide_binddata '1'
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Boolean. If enabled version.server, version.bind, id.server, and
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hostname.bind queries are refused.
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option listen_port '53'
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Port. Incoming. Where Unbound will listen for queries.
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option listen_port '53'
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Port. Incoming. Where Unbound will listen for queries.
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option localservice '1'
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Boolean. Prevent DNS amplification attacks. Only provide access to
|
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Unbound from subnets this machine has interfaces on.
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option localservice '1'
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Boolean. Prevent DNS amplification attacks. Only provide access to
|
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Unbound from subnets this machine has interfaces on.
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option manual_conf '0'
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Boolean. Skip all this UCI nonsense. Manually edit the
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configuration. Make changes to /etc/unbound/unbound.conf.
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option manual_conf '0'
|
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Boolean. Skip all this UCI nonsense. Manually edit the
|
||||
configuration. Make changes to /etc/unbound/unbound.conf.
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option protocol 'mixed'
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Unbound can limit its protocol used for recursive queries.
|
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Set 'ip4_only' to avoid issues if you do not have native IP6.
|
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Set 'ip6_prefer' to possibly improve performance as well as
|
||||
not consume NAT paths for the client computers.
|
||||
Do not use 'ip6_only' unless testing.
|
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option protocol 'mixed'
|
||||
Unbound can limit its protocol used for recursive queries.
|
||||
Set 'ip4_only' to avoid issues if you do not have native IP6.
|
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Set 'ip6_prefer' to possibly improve performance as well as
|
||||
not consume NAT paths for the client computers.
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||||
Do not use 'ip6_only' unless testing.
|
||||
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option query_minimize '0'
|
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Boolean. Enable a minor privacy option. Don't let each server know
|
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the next recursion. Query one piece at a time.
|
||||
option query_minimize '0'
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||||
Boolean. Enable a minor privacy option. Don't let each server know
|
||||
the next recursion. Query one piece at a time.
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||||
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||||
option query_min_strict '0'
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Boolean. Query minimize is best effort and will fall back to normal
|
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when it must. This option prevents the fall back, but less than
|
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standard name servers will fail to resolve their domains.
|
||||
option query_min_strict '0'
|
||||
Boolean. Query minimize is best effort and will fall back to normal
|
||||
when it must. This option prevents the fall back, but less than
|
||||
standard name servers will fail to resolve their domains.
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||||
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||||
option rebind_localhost '0'
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Boolean. Prevent loopback "127.0.0.0/8" or "::1/128" responses.
|
||||
These may used by black hole servers for good purposes like
|
||||
ad-blocking or parental access control. Obviously these responses
|
||||
also can be used to for bad purposes.
|
||||
option rebind_localhost '0'
|
||||
Boolean. Prevent loopback "127.0.0.0/8" or "::1/128" responses.
|
||||
These may used by black hole servers for good purposes like
|
||||
ad-blocking or parental access control. Obviously these responses
|
||||
also can be used to for bad purposes.
|
||||
|
||||
option rebind_protection '1'
|
||||
Boolean. Prevent RFC 1918 Reponses from global DNS. Example a
|
||||
poisoned reponse within "192.168.0.0/24" could be used to turn a
|
||||
local browser into an external attack proxy server.
|
||||
option rebind_protection '1'
|
||||
Boolean. Prevent RFC 1918 Reponses from global DNS. Example a
|
||||
poisoned reponse within "192.168.0.0/24" could be used to turn a
|
||||
local browser into an external attack proxy server.
|
||||
|
||||
option recursion 'passive'
|
||||
Unbound has numerous options for how it recurses. This UCI combines
|
||||
them into "passive," "aggressive," or Unbound's own "default."
|
||||
Passive is easy on resources, but slower until cache fills.
|
||||
option recursion 'passive'
|
||||
Unbound has numerous options for how it recurses. This UCI combines
|
||||
them into "passive," "aggressive," or Unbound's own "default."
|
||||
Passive is easy on resources, but slower until cache fills.
|
||||
|
||||
option resource 'small'
|
||||
Unbound has numerous options for resources. This UCI gives "tiny,"
|
||||
"small," "medium," and "large." Medium is most like the compiled
|
||||
defaults with a bit of balancing. Tiny is close to the published
|
||||
memory restricted configuration. Small 1/2 medium, and large 2x.
|
||||
option resource 'small'
|
||||
Unbound has numerous options for resources. This UCI gives "tiny,"
|
||||
"small," "medium," and "large." Medium is most like the compiled
|
||||
defaults with a bit of balancing. Tiny is close to the published
|
||||
memory restricted configuration. Small 1/2 medium, and large 2x.
|
||||
|
||||
option root_age '9'
|
||||
Days. >90 Disables. Age limit for Unbound root data like root
|
||||
DNSSEC key. Unbound uses RFC 5011 to manage root key. This could
|
||||
harm flash ROM. This activity is mapped to "tmpfs," but every so
|
||||
often it needs to be copied back to flash for the next reboot.
|
||||
option root_age '9'
|
||||
Days. >90 Disables. Age limit for Unbound root data like root
|
||||
DNSSEC key. Unbound uses RFC 5011 to manage root key. This could
|
||||
harm flash ROM. This activity is mapped to "tmpfs," but every so
|
||||
often it needs to be copied back to flash for the next reboot.
|
||||
|
||||
option ttl_min '120'
|
||||
Seconds. Minimum TTL in cache. Recursion can be expensive without
|
||||
cache. A low TTL is normal for server migration. A low TTL can be
|
||||
abused for snoop-vertising (DNS hit counts; recording query IP).
|
||||
Typical to configure maybe 0~300, but 1800 is the maximum accepted.
|
||||
option ttl_min '120'
|
||||
Seconds. Minimum TTL in cache. Recursion can be expensive without
|
||||
cache. A low TTL is normal for server migration. A low TTL can be
|
||||
abused for snoop-vertising (DNS hit counts; recording query IP).
|
||||
Typical to configure maybe 0~300, but 1800 is the maximum accepted.
|
||||
|
||||
option unbound_control '0'
|
||||
Boolean. Enables unbound-control application access ports. Enabling
|
||||
this without the unbound-control package installed is robust.
|
||||
option unbound_control '0'
|
||||
Boolean. Enables unbound-control application access ports. Enabling
|
||||
this without the unbound-control package installed is robust.
|
||||
|
||||
option validator '0'
|
||||
Boolean. Enable DNSSEC. Unbound names this the "validator" module.
|
||||
option validator '0'
|
||||
Boolean. Enable DNSSEC. Unbound names this the "validator" module.
|
||||
|
||||
option validator_ntp '1'
|
||||
Boolean. Disable DNSSEC time checks at boot. Once NTP confirms
|
||||
global real time, then DNSSEC is restarted at full strength. Many
|
||||
embedded devices don't have a real time power off clock. NTP needs
|
||||
DNS to resolve servers. This works around the chicken-and-egg.
|
||||
option validator_ntp '1'
|
||||
Boolean. Disable DNSSEC time checks at boot. Once NTP confirms
|
||||
global real time, then DNSSEC is restarted at full strength. Many
|
||||
embedded devices don't have a real time power off clock. NTP needs
|
||||
DNS to resolve servers. This works around the chicken-and-egg.
|
||||
|
||||
list domain_insecure
|
||||
List. Domains or pointers that you wish to skip DNSSEC. Your DHCP
|
||||
domains and pointers in dnsmasq will get this automatically.
|
||||
list domain_insecure
|
||||
List. Domains or pointers that you wish to skip DNSSEC. Your DHCP
|
||||
domains and pointers in dnsmasq will get this automatically.
|
||||
```
|
||||
|
||||
## Deprecated UCI
|
||||
The dnsmasq specific UCI will still work as well as they did, but please use `option dhcp_link 'dnsmasq'` above. Local host name and WAN host name will be lifted and configured from DHCP UCI subpart dnsmasq. (`dnsmasq_gate_name`, `dnsmasq_link_dns`, `dnsmasq_only_local`)
|
||||
|
||||
|
|
|
|||
|
|
@ -115,7 +115,6 @@ create_interface_dns() {
|
|||
|
||||
if [ "$ignore" -gt 0 ] ; then
|
||||
mode="$UNBOUND_D_WAN_FQDN"
|
||||
|
||||
else
|
||||
mode="$UNBOUND_D_LAN_FQDN"
|
||||
fi
|
||||
|
|
@ -128,8 +127,15 @@ create_interface_dns() {
|
|||
;;
|
||||
|
||||
4)
|
||||
mode_ptr="$if_fqdn"
|
||||
names="$if_fqdn $host_fqdn $UNBOUND_TXT_HOSTNAME"
|
||||
if [ -z "$ifdashname" ] ; then
|
||||
# race conditions at init can rarely cause a blank device return
|
||||
# the record format is invalid and Unbound won't load the conf file
|
||||
mode_ptr="$host_fqdn"
|
||||
names="$host_fqdn $UNBOUND_TXT_HOSTNAME"
|
||||
else
|
||||
mode_ptr="$if_fqdn"
|
||||
names="$if_fqdn $host_fqdn $UNBOUND_TXT_HOSTNAME"
|
||||
fi
|
||||
;;
|
||||
|
||||
*)
|
||||
|
|
@ -297,14 +303,14 @@ unbound_mkdir() {
|
|||
fi
|
||||
fi
|
||||
|
||||
|
||||
|
||||
if [ -f $UNBOUND_KEYFILE.keep ] ; then
|
||||
# root.key.keep is reused if newest
|
||||
cp -u $UNBOUND_KEYFILE.keep $UNBOUND_KEYFILE
|
||||
rm -f $UNBOUND_KEYFILE.keep
|
||||
fi
|
||||
|
||||
|
||||
|
||||
|
||||
# Ensure access and prepare to jail
|
||||
chown -R unbound:unbound $UNBOUND_VARDIR
|
||||
chmod 775 $UNBOUND_VARDIR
|
||||
|
|
|
|||
Loading…
Reference in New Issue