dnsmasq v2.83 has a bug in handling duplicate queries which means it may
try to reply using the incorrect network socket. This is especially
noticeable in dual stack environments where replies may be mis-directed to
IPv4 addresses on an IPv6 socket or IPv6 addresses on an IPv4 socket.
This results in system log spam such as:
dnsmasq[16020]: failed to send packet: Network unreachable
dnsmasq[16020]: failed to send packet: Address family not supported by protocol
dnsmasq v2.84test3 resolves these issues.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
This fixes the following security problems in dnsmasq:
* CVE-2020-25681:
Dnsmasq versions before 2.83 is susceptible to a heap-based buffer
overflow in sort_rrset() when DNSSEC is used. This can allow a remote
attacker to write arbitrary data into target device's memory that can
lead to memory corruption and other unexpected behaviors on the target
device.
* CVE-2020-25682:
Dnsmasq versions before 2.83 is susceptible to buffer overflow in
extract_name() function due to missing length check, when DNSSEC is
enabled. This can allow a remote attacker to cause memory corruption
on the target device.
* CVE-2020-25683:
Dnsmasq version before 2.83 is susceptible to a heap-based buffer
overflow when DNSSEC is enabled. A remote attacker, who can create
valid DNS replies, could use this flaw to cause an overflow in a heap-
allocated memory. This flaw is caused by the lack of length checks in
rtc1035.c:extract_name(), which could be abused to make the code
execute memcpy() with a negative size in get_rdata() and cause a crash
in Dnsmasq, resulting in a Denial of Service.
* CVE-2020-25684:
A lack of proper address/port check implemented in Dnsmasq version <
2.83 reply_query function makes forging replies easier to an off-path
attacker.
* CVE-2020-25685:
A lack of query resource name (RRNAME) checks implemented in Dnsmasq's
versions before 2.83 reply_query function allows remote attackers to
spoof DNS traffic that can lead to DNS cache poisoning.
* CVE-2020-25686:
Multiple DNS query requests for the same resource name (RRNAME) by
Dnsmasq versions before 2.83 allows for remote attackers to spoof DNS
traffic, using a birthday attack (RFC 5452), that can lead to DNS
cache poisoning.
* CVE-2020-25687:
Dnsmasq versions before 2.83 is vulnerable to a heap-based buffer
overflow with large memcpy in sort_rrset() when DNSSEC is enabled. A
remote attacker, who can create valid DNS replies, could use this flaw
to cause an overflow in a heap-allocated memory. This flaw is caused
by the lack of length checks in rtc1035.c:extract_name(), which could
be abused to make the code execute memcpy() with a negative size in
sort_rrset() and cause a crash in dnsmasq, resulting in a Denial of
Service.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Allow configuring ipsets with dedicated config sections:
config ipset
list name 'ss_rules_dst_forward'
list name 'ss_rules6_dst_forward'
list domain 't.me'
list domain 'telegram.org'
instead of current, rather inconvenient syntax:
config dnsmasq
...
list ipset '/t.me/telegram.org/ss_rules_dst_forward,ss_rules6_dst_forward'
Current syntax will still continue to work though.
With this change, a LuCI GUI for DNS ipsets should be easy to implement.
Signed-off-by: Aleksandr Mezin <mezin.alexander@gmail.com>
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com> [PKG_RELEASE increase]
/etc/hotplug.d/ntp/25-dnsmasqsec is being sourced by /sbin/hotplug-call
running as ntpd user. For that to work the file needs to be readable by
that user.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
For IPv6 native connections when using IPv6 DNS lookups, there is no
valid default resolver if ignoring WAN DHCP provided nameservers.
This uses a runtime check to determine if IPv6 is supported on the host.
Signed-off-by: Joel Johnson <mrjoel@lixil.net>
ntpd in packages feed had already a user 'ntp' with UID 123 declared.
Rename the username of busybox-ntpd to be 'ntp' instead of 'ntpd' so
it doesn't clash.
Reported-by: Etienne Champetier <champetier.etienne@gmail.com>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
It should return false to indicate that the option should not be ignored
Fixes 064dc1e8 ("dnsmasq: abort when dnssec requested but not
available")
Reported-by: Sami Olmari <sami@olmari.fi>
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
The TFTP server provided by dnsmasq supports serving a select boot image
based on the client's MAC or IP address. This allows an administrator
to activate this feature in /etc/config/dhcp. Here is an example
/etc/config/dhcp that configures dnsmasq with --tftp-unique-root=mac:
...
config dnsmasq
option enable_tftp 1
option tftp_root /usr/libexec/tftpboot
option tftp_unique_root mac
config boot router
option serveraddress 192.168.1.1
option servername tftp.example.com
option filename openwrt-initramfs-kernel.bin
...
With this configuration, dnsmasq will serve
/usr/libexec/tftpboot/00-11-22-33-44-55/openwrt-initramfs-kernel.bin to
the client with MAC address 00:11:22:33:44:55.
Signed-off-by: W. Michael Petullo <mike@flyn.org>
Abort the dhcp-check based on the interface instead of the carrier
state. In cases where the interface is up but the carrier is down,
netifd won't cause a dnsmasq reload, thus dhcp won't become active
on this interface.
Signed-off-by: David Bauer <mail@david-bauer.net>
Before this commit, if uci option "dnssec" was set, we pass "--dnssec"
and friends to dnsmasq, let it start and decide whether to quit and
whether to emit message for diagnosis
# dnsmasq --dnssec; echo $?
dnsmasq: DNSSEC not available: set HAVE_DNSSEC in src/config.h
1
DNSSEC as a feature is different from others like dhcp, tftp in that
it's a security feature. Better be explicit. With this change
committed, we make it so by not allowing it in the first in the
initscript, should dnsmasq later decides to not quit (not likely) or
quit without above explicit error (unlikely but less so ;)
So this is just being proactive. on/off choices with uci option
"dnssec" are still available like before
Link: https://github.com/openwrt/openwrt/pull/3265#issuecomment-667795302
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
This fixes a nasty problem introduced in 2.81 which causes random
crashes on systems where there's significant DNS activity over TCP. It
also fixes DNSSEC validation problems with zero-TTL DNSKEY and DS
records.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Hotplug scripts are sourced so the #!/bin/sh is superfluous/deceptive.
Re-arrange script to only source 'procd' if we get to the stage of
needing to signal the process, reduce hotplug processing load a little.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Init script checks for an already active DHCP server on the interface
and if such DHCP server is found, then it logs "refusing to start DHCP"
message, starts dnsmasq without DHCP service unless `option force 1` is
set and caches the DHCP server check result.
Each consecutive service start then uses this cached DHCP server check
result, but doesn't provide log feedback about disabled DHCP service
anymore.
So this patch ensures, that the log message about disabled DHCP service
on particular interface is always provided.
Acked-by: Hans Dedecker <dedeckeh@gmail.com>
Signed-off-by: Petr Štetiar <ynezz@true.cz>
Bump to 2.81rc5 and re-work ipset-remove-old-kernel-support.
More runtime kernel version checking is done in 2.81rc5 in various parts
of the code, so expand the ipset patch' scope to inlude those new areas
and rename to something a bit more generic.:wq
Upstream changes from rc4
532246f Tweak to DNSSEC logging.
8caf3d7 Fix rare problem allocating frec for DNSSEC.
d162bee Allow overriding of ubus service name.
b43585c Fix nameserver list in auth mode.
3f60ecd Fixed resource leak on ubus_init failure.
0506a5e Handle old kernels that don't do NETLINK_NO_ENOBUFS.
e7ee1aa Extend stop-dns-rebind to reject IPv6 LL and ULA addresses. We also reject the loopback address if rebind-localhost-ok is NOT set.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Fix the test for an enabled sysntp initscript in dnsmasq.init, and get
rid of "test -o" while at it.
Issue reproduced on openwrt-19.07 with the help of pool.ntp.br and an
RTC-less ath79 router. dnssec-no-timecheck would be clearly missing
from /var/etc/dnsmasq.conf.* while the router was still a few days in
the past due to non-working DNSSEC + DNS-based NTP server config.
The fix was tested with the router in the "DNSSEC broken state": it
properly started dnsmasq in dnssec-no-timecheck mode, and eventually ntp
was able to resolve the server name to an IP address, and set the system
time. DNSSEC was then enabled by SIGINT through the ntp hotplug hook,
as expected.
A missing system.ntp.enabled UCI node is required for the bug to show
up. The reasons for why it would be missing in the first place were not
investigated.
Signed-off-by: Henrique de Moraes Holschuh <henrique@nic.br>
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com> [PKG_RELEASE increase]
Refer to shellcheck SC2166. There are just too many caveats that are
shell-dependent on test -a and test -o to use them.
Signed-off-by: Henrique de Moraes Holschuh <henrique@nic.br>
Add option 'scriptarp' to uci dnsmasq config to enable --script-arp functions.
The default setting is false, meaning any scripts in `/etc/hotplug.d/neigh` intended
to be triggered by `/usr/lib/dnsmasq/dhcp-script.sh` will fail to execute.
Also enable --script-arp if has_handlers returns true.
Signed-off-by: Jordan Sokolic <oofnik@gmail.com>
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com> [PKG_RELEASE increase]
Bump to latest release candidate and drop 2 local patches that have been
upstreamed.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Bump to dnsmasq 2.81rc2. In the process discovered several compiler
warnings one with a logical error.
2 relevant patches sent upstream, added as 2 local patches for OpenWrt
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
1st release candidate for v2.81 after 18 months.
Refresh patches & remove all upstreamed leaving:
110-ipset-remove-old-kernel-support.patch
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
A file, package/network/services/dnsmasq/files/50-dnsmasq-migrate-resolv-conf-auto.sh,
was added in commit 6a28552120, but it
does not exit in a way that tells the uci-defaults mechanism that it
succeeded, and so it is not cleaned up after running successfully. Add
an exit 0 to the end to correct that.
Signed-off-by: Russell Senior <russell@personaltelco.net>
This activates PIE ASLR support by default when the regular option is
selected.
This increases the binary size by 37% uncompressed and 18% compressed
on MIPS BE.
old:
146,933 /usr/sbin/dnsmasq
101,837 dnsmasq_2.80-14_mips_24kc.ipk
new:
202,020 /usr/sbin/dnsmasq
120,577 dnsmasq_2.80-14_mips_24kc.ipk
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Acked-by: Petr Štetiar <ynezz@true.cz>
When running sysupgrade from an existing configuration, UCI option
dhcp.@dnsmasq[0].resolvfile needs to be modified in case it has not
been changed from it's original value.
Accomplish that using a uci-defaults script.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Previous commit should have bumped PKG_RELEASE, but git add was
forgotten... Add it now.
Fixes: cd48d8d342 ("dnsmasq: switch to /tmp/resolv.conf.d/resolv.conf.auto")
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Mount-bind directory instead of resolv.conf.auto file in jail to
avoid problems when the file is deleted/replaced.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This is a backport from the dnsmasq master which should fix a bug which
could cause a crash in dnsmasq.
I saw the following crashes in my log:
[522413.117215] do_page_fault(): sending SIGSEGV to dnsmasq for invalid read access from 2a001450
[522413.124464] epc = 004197f1 in dnsmasq[400000+23000]
[522413.129459] ra = 004197ef in dnsmasq[400000+23000]
This is happening in blockdata_write() when block->next is
dereferenced, but I am not sure if this is related to this problem or if
this is a different problem. I am unable to reproduce this problem.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
dnsmasq v2.80 made 'dnssec-check-unsigned' the default, thus the uci
option was rendered ineffectual: we checked unsigned zones no matter the
setting.
Disabling the checking of unsigned zones is now achieve with the
"--dnssec-check-unsigned=no" dnsmasq option.
Update init script to pass required option in the disabled case.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
This decreases the binary size when PIE ASLR is activated by 8% on MIPS BE.
old:
202,020 /usr/sbin/dnsmasq
new:
185,676 /usr/sbin/dnsmasq
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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>
