OpenBSD has introduced a new daemon named resolvd(8) to manage
resolv.conf. This creates problems with the old "horrible way" of
completely replacing resolv.conf. Resolvd will attempt to merge manual
changes with DNS servers discovered through dhcpleased(8) and slaacd(8).
Unfortunately, resolvd puts any manual modifications at the end of
resolv.conf, meaning that the wg-quick name servers will be queried
last.
The process for handling multiple name servers (at least with libc) is
to try a name server, and if the query times out, try the next, until
out of name servers, then repeat trying all name servers until a maximum
number of retries are performed. The name servers are queried in the
order listed in resolv.conf and the timeout is 5 seconds.
With this patch, we ensure the wg-quick name server is first in
resolv.conf (as route creates the name server with "static" priority),
but cannot ensure it is exclusive. Therfore, it may be possible that
queries are leaked to other name servers if the wg-quick name server
doesn't respond within 5 seconds.
We have another problem however, and that is if resolvd detects unwind
is running, it will set 127.0.0.1 as the only name server in
resolv.conf. unwind does not have deterministic name server selection in
the default configuration. This means, all a user would need to do to
inadvertently cause persistent query leaks would be to run `rcctl enable
unwind`.
There are warnings added when these situations may occur.
The next step is to add an exclusive flag and search to route and
resolvd.
Reported-by: Matthieu Herrb <matthieu@herrb.eu>
Signed-off-by: Matt Dunwoodie <ncon@noconroy.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
On macOS, under specific configurations, the `netstat -nr -f inet` and
`netstat -nr -f inet6` outputs break gateway collection.
Signed-off-by: Laura Hausmann <laura@hausmann.dev>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
If the route monitor doesn't attempt to write more to stdout, then this
leaves a process hanging around. Kill it explicitly. We also switch to
using exec in the process substitution, to reduce a bash process.
Closes: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255286
Reported-by: Christos Chatzaras <chris@cretaforce.gr>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
We no longer need the arp hack, as these bugs have been fixed in the
FreeBSD kernel.
This partially reverts 090639ae90.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
FreeBSD's bash doesn't handle <(...) safely, creating a temporary file
instead of using /proc/self/fd/N like on Linux. Work around this by
using a simple pipeline with /dev/stdin.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
If we execute `wg --version` we get a different version string that does
not match with the version string in the openwrt makefile.
Current version string:
`wireguard-tools vreboot-13159-gac5caa2718 -https://git.zx2c4.com/wireguard-tools/`
Corrected versions string:
`wireguard-tools v1.0.20200319 -https://git.zx2c4.com/wireguard-tools/`
Signed-off-by: Florian Eckert <fe@dev.tdt.de>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
If the stream is not closed, then this winds up hanging forever. So
remove the trailing \n\n and check manually after.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
With alignment between the kernel and userspace, along with userspace
packages, we can now rely on the kernel in the future always having
wg(4).
This also simplifies the interface selection logic, and stores the
wg-quick interface name as the description.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This reverts commit 26683f6c9a, which
means the old problem comes back. That's an issue. But waiting on
process substitutions is not available with commonly used bash versions:
# wg-quick up demo
[#] ip link add demo type wireguard
[#] wg setconf demo /dev/fd/63
/usr/bin/wg-quick: line 251: wait: pid 2955 is not a child of this shell
[#] ip link delete dev demo
This means we have to wait a few years before fixing this issue. IOW,
bash limitation; can't fix.
Reported-by: Theodore Mozzo <theodore.mozzo@gmail.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Android 11's ndc regresses even more, but it turns out that netd doesn't
need to track up/down state via direct invocation, so just set the
interface up by way of normal iproute2.
Reported-by: Harsh Shandilya <me@msfjarvis.dev>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Bash does not propagate error values, which is a bummer, but process
substitutions are a useful feature. Introduce a new idiom to deal with
this: either "; wait $!" after the line to propagate the error, or "||
true" to indicate explicitly that we don't care about the error.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
We also make these constant time, even though we're never distinguishing
between bits of a secret using them. From that perspective, though, this
is markedly better than the locale-specific table lookups in glibc, even
though base64 characters span two cache lines and valid private keys
must hit both.
Co-authored-by: Samuel Neves <sneves@dei.uc.pt>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Samuel Neves <sneves@dei.uc.pt>
Users can now run `systemctl reload wg-quick@wgnet0`, as described in
the wg-quick(8) man page. Note that this won't adjust Address=, DNS=, or
the various other non-wg(8) fields.
Signed-off-by: Domonkos P. Tomcsanyi <domi@tomcsanyi.net>
[zx2c4: use exec for bash commands to reduce excess forks, and rewrite
commit message]
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Matt Dunwoodie
Jason A. Donenfeld
Laura Hausmann
Hangbin Liu
Kyle Evans
Florian Eckert
Domonkos P. Tomcsanyi