Backport upstream patches pre 2.81rc for testing purposes.
Let's see what falls out!
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
This is to make life easier for users with customized build of
dnsmasq-full variant. Currently dnsmasq config generated by current
service script will be rejected by dnsmasq build lacking DHCP feature
- Options like --dhcp-leasefile have default values. Deleting them
from uci config or setting them to empty value will make them take on
default value in the end
- Options like --dhcp-broadcast are output unconditionally
Tackle this by
- Check availablility of features from output of "dnsmasq --version"
- Make a list of options guarded by HAVE_xx macros in src/options.c of
dnsmasq source code
- Ignore these options in xappend()
Two things to note in this implementation
- The option list is not exhaustive. Supposedly only those options that
may cause dnsmasq to reject with "unsupported option (check that
dnsmasq was compiled with DHCP/TFTP/DNSSEC/DBus support)" are taken
into account here
- This provides a way out but users' cooperation is still needed. E.g.
option dnssec needs to be turned off, otherwise the service script
will try to add --conf-file pointing to dnssec specific anchor file
which dnsmasq lacking dnssec support will reject
Resolves FS#2281
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
max_ttl - limit the ttl in the dns answer if greater as $max_ttl
min_cache_ttl - force caching of dns answers even the ttl in the answer
is lower than the $min_cache_ttl
max_cache_ttl - cache only dns answer for $max_cache_ttl.
Signed-off-by: Alexander Couzens <lynxis@fe80.eu>
This makes it clear that localuse when explicitly specified in the
config will have its final say on whether or not the initscript should
touch /etc/resolv.conf, no matter whatever the result of previous
guesswork would be
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
Currently it seems impossible to configure /etc/config/dhcp to achieve
the following use case
- run dnsmasq with no-resolv
- re-generate /etc/resolv.conf with "nameserver 127.0.0.1"
Before this change, we have to set resolvfile to /tmp/resolv.conf.auto
to achive the 2nd effect above, but setting resolvfile requires noresolv
being false.
A new boolean option "localuse" is added to indicate that we intend to
use dnsmasq as the local dns resolver. It's false by default and to
align with old behaviour it will be true automatically if resolvfile is
set to /tmp/resolv.conf.auto
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
Acked-by: Hans Dedecker <dedeckeh@gmail.com>
Opkg treats text after a version number as higher than without:
~# opkg compare-versions "2.80rc1" "<<" "2.80"; echo $?
1
~# opkg compare-versions "2.80rc1" ">>" "2.80"; echo $?
0
This causes opkg not offering final release as upgradable version, and
even refusing to update, since it thinks the installed version is
higher.
This can be mitigated by adding ~ between the version and the text, as ~
will order as less than everything except itself. Since 'r' < 't', to
make sure that test will be treated as lower than rc we add a second ~
before the test tag. That way, the ordering becomes
2.80~~test < 2.80~rc < 2.80
which then makes opkg properly treat prerelease versions as lower.
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
f52bb5b fix previous commit
18eac67 Fix entries in /etc/hosts disabling static leases.
f8c77ed Fix removal of DHCP_CLIENT_MAC options from DHCPv6 relay replies.
4bf62f6 Tidy cache_blockdata_free()
9c0d445 Fix e7bfd556c079c8b5e7425aed44abc35925b24043 to actually work.
2896e24 Check for not(DS or DNSKEY) in is_outdated_cname_pointer()
a90f09d Fix crash freeing negative SRV cache entries.
5b99eae Cache SRV records.
2daca52 Fix typo in ra-param man page section.
2c59473 File logic bug in cache-marshalling code. Introduced a couple of commits back.
cc921df Remove nested struct/union in cache records and all_addr.
ab194ed Futher address union tidying.
65a01b7 Tidy address-union handling: move class into explicit argument.
bde4647 Tidy all_addr union, merge log and rcode fields.
e7bfd55 Alter DHCP address selection after DECLINE in consec-addr mode. Avoid offering the same address after a recieving a DECLINE message to stop an infinite protocol loop. This has long been done in default address allocation mode: this adds similar behaviour when allocaing addresses consecutively.
The most relevant fix for openwrt is 18eac67 (& my own local f52bb5b
which fixes a missing bracket silly) To quote the patch:
It is possible for a config entry to have one address family specified by a
dhcp-host directive and the other added from /etc/hosts. This is especially
common on OpenWrt because it uses odhcpd for DHCPv6 and IPv6 leases are
imported into dnsmasq via a hosts file.
To handle this case there need to be separate *_HOSTS flags for IPv4 and IPv6.
Otherwise when the hosts file is reloaded it will clear the CONFIG_ADDR(6) flag
which was set by the dhcp-host directive.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
The above options were incorrectly changed to required tags. Make them
optional again.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
During upstream removal of conditional ipv6 support an order swap error
was made in a ternary operator usage.
This patch sent upstream.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Backport upstream commits. Most interesting 122392e which changes how
SERVFAIL is handled especially in event of genuine server down/failure
scenarios with multiple servers. a799ca0 also interesting in that
answered received via TCP are now cached, DNSSEC typically using TCP
meant until now answers weren't cached, hence reducing performance.
59e4703 Free config file values on parsing errors.
48d12f1 Remove the NO_FORK compile-time option, and support for uclinux.
122392e Revert 68f6312d4bae30b78daafcd6f51dc441b8685b1e
3a5a84c Fix Makefile lines generating UBUS linker config.
24b8760 Do not rely on dead code elimination, use array instead. Make options bits derived from size and count. Use size of option bits and last supported bit in computation. No new change would be required when new options are added. Just change OPT_LAST constant.
6f7812d Fix spurious AD flags in some DNS replies from local config.
cbb5b17 Fix logging in cf5984367bc6a949e3803a576512c5a7bc48ebab
cf59843 Don't forward *.bind/*.server queries upstream
ee87504 Remove ability to compile without IPv6 support.
a220545 Ensure that AD bit is reset on answers from --address=/<domain>/<address>.
a799ca0 Impove cache behaviour for TCP connections.
Along with an additional patch to fix compilation without DHCPv6, sent
upstream.
I've been running this for aaaages without obvious issue hence brave
step of opening to wider openwrt community.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
This reverts commit a6a8fe0be5.
buildbot found an error
option.c: In function 'dhcp_context_free':
option.c:1042:15: error: 'struct dhcp_context' has no member named 'template_interface'
free(ctx->template_interface);
revert for the moment
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Backport upstream commits. Most interesting 122392e which changes how
SERVFAIL is handled especially in event of genuine server down/failure
scenarios with multiple servers. a799ca0 also interesting in that
answered received via TCP are now cached, DNSSEC typically using TCP
meant until now answers weren't cached, hence reducing performance.
59e4703 Free config file values on parsing errors.
48d12f1 Remove the NO_FORK compile-time option, and support for uclinux.
122392e Revert 68f6312d4bae30b78daafcd6f51dc441b8685b1e
3a5a84c Fix Makefile lines generating UBUS linker config.
24b8760 Do not rely on dead code elimination, use array instead. Make options bits derived from size and count. Use size of option bits and last supported bit in computation. No new change would be required when new options are added. Just change OPT_LAST constant.
6f7812d Fix spurious AD flags in some DNS replies from local config.
cbb5b17 Fix logging in cf5984367bc6a949e3803a576512c5a7bc48ebab
cf59843 Don't forward *.bind/*.server queries upstream
ee87504 Remove ability to compile without IPv6 support.
a220545 Ensure that AD bit is reset on answers from --address=/<domain>/<address>.
a799ca0 Impove cache behaviour for TCP connections.
I've been running this for aaaages without obvious issue hence brave
step of opening to wider openwrt community.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Openwrt no longer uses and has not used since 5acfe55d71 Jun 2016 the
timestamp file (/etc/dnsmasq.time) method of resolving the dnssec/ntp
dnslookup chicken/egg problem, having used signals from ntp since that
change.
Drop the 'dnssec-improve-timestamp-heuristic' patch since it is neither
used nor sent upstream. One less thing to refresh & maintain.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Install following as config files (600) perms instead of as data (644)
/usr/share/dnsmasq/dhcpbogushostname.conf
/usr/share/dnsmasq/trust-anchors.conf
/usr/share/dnsmasq/rfc6761.conf
/etc/hotplug.d/ntp/25-dnsmasqsec
/etc/config/dhcp
/etc/dnsmasq.conf
dnsmasq reads relevant config files before dropping root privilege and
running as dnsmasq:dnsmasq
ntpd runs as root so the hotplug script is still accessible
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
This patch fixes jailed dnsmasq running into the following issue:
|dnsmasq[1]: cannot read /usr/share/dnsmasq/dhcpbogushostname.conf: No such file or directory
|dnsmasq[1]: FAILED to start up
|procd: Instance dnsmasq::cfg01411c s in a crash loop 6 crashes, 0 seconds since last crash
Fixes: a45f4f50e1 ("dnsmasq: add dhcp-ignore-names support - CERT VU#598349")
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
[bump package release]
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
53792c9 fix typo
df07182 Update German translation.
Remove local patch 001-fix-typo which is a backport of the above 53792c9
There is no practical difference between our test8 release and this rc
release, but this does at least say 'release candidate'
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
dnsmasq v2.80test8 adds the ability to ignore dhcp client's requests for
specific hostnames. Clients claiming certain hostnames and thus
claiming DNS namespace represent a potential security risk. e.g. a
malicious host could claim 'wpad' for itself and redirect other web
client requests to it for nefarious purpose. See CERT VU#598349 for more
details.
Some Samsung TVs are claiming the hostname 'localhost', it is believed
not (yet) for nefarious purposes.
/usr/share/dnsmasq/dhcpbogushostname.conf contains a list of hostnames
in correct syntax to be excluded. e.g.
dhcp-name-match=set:dhcp_bogus_hostname,localhost
Inclusion of this file is controlled by uci option dhcpbogushostname
which is enabled by default.
To be absolutely clear, DHCP leases to these requesting hosts are still
permitted, but they do NOT get to claim ownership of the hostname
itself and hence put into DNS for other hosts to be confused/manipulate by.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
e1791f3 Fix logging of DNSSEC queries in TCP mode. Destination server address was misleading.
0fdf3c1 Fix dhcp-match-name to match hostname, not complete FQDN.
ee1df06 Tweak strategy for confirming SLAAC addresses.
1e87eba Clarify manpage for --auth-sec-servers
0893347 Make interface spec optional in --auth-server.
7cbf497 Example config file fix for CERT Vulnerability VU#598349.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Bump to latest test release:
3a610a0 Finesse allocation of memory for "struct crec" cache entries.
48b090c Fix b6f926fbefcd2471699599e44f32b8d25b87b471 to not SEGV on startup (rarely).
4139298 Change behavior when RD bit unset in queries.
51cc10f Add warning about 0.0.0.0 and :: addresses to man page.
ea6cc33 Handle memory allocation failure in make_non_terminals()
ad03967 Add debian/tmpfiles.conf
f4fd07d Debian bugfix.
e3c08a3 Debian packaging fix. (restorecon)
118011f Debian packaging fix. (tmpfiles.d)
Delete our own backports of ea6cc33 & 4139298, so the only real changes
here, since we don't care about the Debian stuff are 48b090c & 3a610a0
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Backport upstream commit
Change anti cache-snooping behaviour with queries with the
recursion-desired bit unset. Instead to returning SERVFAIL, we
now always forward, and never answer from the cache. This
allows "dig +trace" command to work.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Refresh patches
Changes since latest bump:
af3bd07 Man page typo.
d682099 Picky changes to 47b45b2967c931fed3c89a2e6a8df9f9183a5789
47b45b2 Fix lengths of interface names
2b38e38 Minor improvements in lease-tools
282eab7 Mark die function as never returning
c346f61 Handle ANY queries in context of da8b6517decdac593e7ce24bde2824dd841725c8
03212e5 Manpage typo.
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
The dnsmasq variants should provide dnsmasq, otherwise it is impossible
to include them in the image.
This change allows one to have CONFIG_PACKAGE_dnsmasq=m and
CONFIG_PACKAGE_dnsmasq-full=y, e.g. because you want DNSSEC support, or
IPSETs suport on your 3000-devices fleet ;-)
Signed-off-by: Henrique de Moraes Holschuh <henrique@nic.br>
Refresh patches
Remove 240-ubus patch as upstream accepted.
Add uci option ubus which allows to enable/disable ubus support (enabled
by default)
Upstream commits since last bump:
da8b651 Implement --address=/example.com/#
c5db8f9 Tidy 7f876b64c22b2b18412e2e3d8506ee33e42db7c
974a6d0 Add --caa-record
b758b67 Improve logging of RRs from --dns-rr.
9bafdc6 Tidy up file parsing code.
97f876b Properly deal with unaligned addresses in DHCPv6 packets.
cbfbd17 Fix broken DNSSEC records in previous.
b6f926f Don't return NXDOMAIN to empty non-terminals.
c822620 Add --dhcp-name-match
397c050 Handle case of --auth-zone but no --auth-server.
1682d15 Add missing EDNS0 section. EDNS0 section missing in replies to EDNS0-containing queries where answer generated from --local=/<domain>/
dd33e98 Fix crash parsing a --synth-domain with no prefix. Problem introduced in 2.79/6b2b564ac34cb3c862f168e6b1457f9f0b9ca69c
c16d966 Add copyright to src/metrics.h
1dfed16 Remove C99 only code.
6f835ed Format fixes - ubus.c
9d6fd17 dnsmasq.c fix OPT_UBUS option usage
8c1b6a5 New metrics and ubus files.
8dcdb33 Add --enable-ubus option.
aba8bbb Add collection of metrics
caf4d57 Add OpenWRT ubus patch
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
Remove creation of file /etc/ethers in dnsmasq init script as the
file is now created by default in the base-files package by
commit fa3301a28e
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
Refresh patches
Upstream commits since last bump:
3b6eb19 Log DNSSEC trust anchors at startup.
f3e5787 Trivial comment change.
c851c69 Log failure to confirm an address in DHCPv6.
a3bd7e7 Fix missing fatal errors when parsing some command-line/config options.
ab5ceaf Document the --help option in the french manual
1f2f69d Fix recurrent minor spelling mistake in french manual
f361b39 Fix some mistakes in french translation of the manual
eb1fe15 When replacing cache entries, preserve CNAMES which target them.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
As dnsmasq is started earlier than netifd usage of network.sh functions
at boottime will fail; therefore don't call at boottime the functions
which construct the dhcp pool/relay info.
As interface triggers are installed the dhcp pool/relay info will be
constructed when the interface gets reported as up by netifd.
At the same time also register interface triggers based on DHCP relay
config.
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
Refresh patches and backport upstream to current HEAD:
a997ca0 Fix sometimes missing DNSSEC RRs when DNSSEC validation not enabled.
51e4eee Fix address-dependent domains for IPv6.
05ff659 Fix stupid infinite loop introduced by preceding commit.
db0f488 Handle some corner cases in RA contructed interfaces with addresses changing interface.
7dcca6c Warn about the impact of cache-size on performance.
090856c Allow zone transfer in authoritative mode whenever auth-peer is specified.
cc5cc8f Sane error message when pcap file header is wrong.
c488b68 Handle standard and contructed dhcp-ranges on the same interface.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Commit ecd954d530 installs specific interface triggers which rewrites the dnsmasq config
file and restarts dnsmasq if the network interface becomes active for which a trigger
has been installed.
In case no dhcp sections are specified or ignore is set to 1 dnsmasq will not be started
at startup which breaks DNS resolving.
Fix this by ditching the BOOT check in start_service and always start dnsmasq at startup.
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
Fix condir option processing allowing to use the format
"<directory>[,<file-extension>......]," as documented on the dnsmasq man
page which previously resulted into bogus dir being created.
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
Refresh patches and backport upstream to current HEAD:
1f1873a Log warning on very large cachesize config, instead of truncating it.
0a496f0 Do unsolicited RAs for interfaces which appear after dnsmasq startup.
e27825b Fix logging in previous.
1f60a18 Retry SERVFAIL DNSSEC queries to a different server, if possible.
a0088e8 Handle query retry on REFUSED or SERVFAIL for DNSSEC-generated queries.
34e26e1 Retry query to other servers on receipt of SERVFAIL rcode.
6b17335 Add packet-dump debugging facility.
07ed585 Add logging for DNS error returns from upstream and local configuration.
0669ee7 Fix DHCP broken-ness when --no-ping AND --dhcp-sequential-ip are set.
f84e674 Be persistent with broken-upstream-DNSSEC warnings.
Compile & run tested: ar71xx Archer C7 v2
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Right now interface.update events are sent out by netifd upon interface state,
route, address (lifetime), prefix lifetime changes.
Dnsmasq is only interested in interface state changes and currently adds an
interface trigger for all the "interface.*" events.
In combination with commit 23bba9cb33, which triggers a SIGHUP signal to dnsmasq,
IPv6 address/prefix lifetime changes on the wan will trigger dnsmasq reloads which
can become frequent in case of shorter lifetimes.
To avoid frequent dnsmasq reload, this patch adds specific interface triggers.
During dnsmasq init it loops dhcp uci section; if the value of the ignore option
is set to 0, then the corresponding interface trigger is not installed.
Otherwise, if the ignore option value is 1, then procd_add_interface_trigger is
called which adds the interface trigger.
Signed-off-by: hux <xinxing.huchn@gmail.com>
RFC6771 does not exclude the forwarding of the example domain as it
states : "Caching DNS servers SHOULD NOT recognize example names as
special and SHOULD resolve them normally."
Example domains cannot be assigned to any user or person by DNS
registrars as they're registered in perpetuity to IANA meaning
they can be resolved; therefore let's remove the example domains
from the rfc6761.conf file.
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
Improve portability of init script by declaring resolvfile as local
in dnsmasq_stop function.
Fixes resolvfile being set for older busybox versions in dnsmasq_start
in a multi dnsmasq instance config when doing restart; this happens when
the last instance has a resolvfile configured while the first instance
being started has noresolv set to 1.
Base on a patch by "Phil"
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
94b6878 Tidy crypto.c of old library compat. Now need libnettle 3.
8b96552 Fix compiler warning.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
1721453 Remove special handling of A-for-A queries.
499d8dd Fix boundary for test introduced in 3e3f1029c9ec6c63e430ff51063a6301d4b2262
6f1cbfd Fix debian/readme typo.
55ecde7 Inotify: Ignore backup files created by editors
6b54d69 Make failure to chown() pidfile a warning.
246a31c Change ownership of pid file, to keep systemd happy.
83e4b73 Remove confusion between --user and --script-user.
6340ca7 Tweak heuristic for initial DNSSEC memory allocation.
baf553d Default min-port to 1024 to avoid reserved ports.
486bcd5 Simplify and correct bindtodevice().
be9a74d Close Debian bug for CVE-2017-15107.
ffcbc0f Example config typo fixes.
a969ba6 Special case NSEC processing for root DS record, to avoid spurious BOGUS.
f178172 Add homepage to Debian control file.
cd7df61 Fix DNSSEC validation errors introduced in 4fe6744a220eddd3f1749b40cac3dfc510787de6
c1a4e25 Try to be a little more clever at falling back to smaller DNS packet sizes.
4fe6744 DNSSEC fix for wildcard NSEC records. CVE-2017-15107 applies.
3bd4c47 Remove limit on length of command-line options.
98196c4 Typo fix.
22cd860 Allow more than one --bridge-interface option to refer to an interface.
3c973ad Use SIGINT (instead of overloading SIGHUP) to turn on DNSSEC time validation.
faaf306 Spelling fixes.
c7e6aea Change references to gPXE to iPXE. Development of EtherBoot gPXE was always development of iPXE core developer Michael Brown.
e541245 Handle duplicate RRs in DNSSEC validation.
84a01be Bump year in Debian copyright notice.
d1ced3a Update copyrights to 2018.
a6cee69 Fix exit code from dhcp_release6.
0039920 Severely fix code formating of contrib/lease-tools/dhcp_release6.c
39d8550 Run Debian startup regex in "C" locale.
ef3d137 Fix infinite retries in strict-order mode.
8c707e1 Make 373e91738929a3d416e6292e65824184ba8428a6 compile without DNSSEC.
373e917 Fix a6004d7f17687ac2455f724d0b57098c413f128d to cope with >256 RRs in answer section.
74f0f9a Commment language tweaks.
ed6bdb0 Man page typos.
c88af04 Modify doc.html to mention git-over-http is now available.
ae0187d Fix trust-anchor regexp in Debian init script.
0c50e3d Bump version in Debian package.
075366a Open inotify socket only when used.
8e8b2d6 Release notes update.
087eb76 Always return a SERVFAIL response to DNS queries with RD=0.
ebedcba Typo in printf format string added in 22dee512f3738f87539a79aeb52b9e670b3bd104
0954a97 Remove RSA/MD5 DNSSEC algorithm.
b77efc1 Tidy DNSSEC algorithm table use.
3b0cb34 Fix manpage which said ZSK but meant KSK.
aa6f832 Add a few DNS RRs to the table.
ad9c6f0 Add support for Ed25519 DNSSEC signature algorithm.
a6004d7 Fix caching logic for validated answers.
c366717 Tidy up add_resource_record() buffer size checks.
22dee51 Log DNS server max packet size reduction.
6fd5d79 Fix logic on EDNS0 headers.
9d6918d Use IP[V6]_UNICAST_IF socket option instead of SO_BINDTODEVICE for DNS.
a49c5c2 Fix search_servers() segfault with DNSSEC.
30858e3 Spaces in CNAME options break parsing.
Refresh patches.
Remove upstreamed patches:
250-Fix-infinite-retries-in-strict-order-mode.patch
260-dnssec-SIGINT.patch
270-dnssec-wildcards.patch
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
A DNSSEC validation error was introduced in the fix for CVE-2017-15107
Backport the upstream fix to the fix (a simple typo)
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
CVE-2017-15107
An interesting problem has turned up in DNSSEC validation. It turns out
that NSEC records expanded from wildcards are allowed, so a domain can
include an NSEC record for *.example.org and an actual query reply could
expand that to anything in example.org and still have it signed by the
signature for the wildcard. So, for example
!.example.org NSEC zz.example.org
is fine.
The problem is that most implementers (your author included, but also
the Google public DNS people, powerdns and Unbound) then took that
record to prove the nothing exists between !.example.org and
zz.example.org, whereas in fact it only provides that proof between
*.example.org and zz.example.org.
This gives an attacker a way to prove that anything between
!.example.org and *.example.org doesn't exists, when it may well do so.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Dnsmasq used SIGHUP to do too many things: 1) set dnssec time validation
enabled, 2) bump SOA zone serial, 3) clear dns cache, 4) reload hosts
files, 5) reload resolvers/servers files.
Many subsystems within LEDE can send SIGHUP to dnsmasq: 1) ntpd hotplug
(to indicate time is valid for dnssec) 2) odhcpd (to indicate a
new/removed host - typically DHCPv6 leases) 3) procd on interface state
changes 4) procd on system config state changes, 5) service reload.
If dnssec time validation is enabled before the system clock has been
set to a sensible time, name resolution will fail. Because name
resolution fails, ntpd is unable to resolve time server names to
addresses, so is unable to set time. Classic chicken/egg.
Since commits 23bba9cb33 (service reload) &
4f02285d8b (system config) make it more
likely a SIGHUP will be sent for events other than 'ntpd has set time'
it is more likely that an errant 'name resolution is failing for
everything' situation will be encountered.
Fortunately the upstream dnsmasq people agree and have moved 'check
dnssec timestamp enable' from SIGHUP handler to SIGINT.
Backport the upstream patch to use SIGINT.
ntpd hotplug script updated to use SIGINT.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Send a SIGHUP signal via procd to the dnsmasq service so the instance(s)
re-read(s) the /tmp/hosts/dhcp config.
Signed-off-by: Florian Eckert <fe@dev.tdt.de>
