Tailscale uses policy routing to enable certain traffic to bypass
routes that lead into the Tailscale mesh. NixOS's reverse path
filtering setup doesn't understand the policy routing at play,
and so incorrectly interprets some of this traffic as spoofed.
Since this only breaks some features of Tailscale, merely warn
users about it, rather than make it a hard error.
Updates tailscale/tailscale#4432
Signed-off-by: David Anderson <dave@natulte.net>
For some features, tailscaled uses getent(1) to get the shell
of OS users. getent(1) is in the glibc derivation. Without this
derivation in the path, tailscale falls back to /bin/sh for all
users.
Signed-off-by: David Anderson <dave@natulte.net>
This avoids the scenario where you activate a new config over Tailscale,
and a long delay between the "stop services" and "start services" phases
of the activation script lead to your terminal freezing for tens of
seconds, until tailscaled finally gets started again and the session
recovers.
Per the documentation of stopIfChanged, this is only safe to do if the
service definition is robust to stopping the old process using the new
service definition. As the maintainer of the upstream systemd unit, I
can confirm that Tailscale is robust to this scenario: it has to be
in order to work right on several other distros that just do
unpack-then-restart, rather than the more complex stop-unpack-start
dance.
Signed-off-by: David Anderson <dave@natulte.net>
tailscale allows to specify the interface name.
The upstream systemd unit does not expose it directly however, only
via the `FLAGS` environment variable.
I can’t be 100% sure that the escaping is correct, but this is as good
as we can do for now, unless upstream changes their unit file.
Currently tailscaled expects `sysctl` (from package procps) to be present
in the path when running on Linux. It can function without the `sysctl`
command present but it prints an error about it. This fixes that error.
Warning: couldn't check net.ipv4.ip_forward (exec: "sysctl":
executable file not found in $PATH).
Signed-off-by: Christine Dodrill <me@christine.website>
This simplifies testing changes to the tailscale service on a local
machine. You can use this as such:
```nix
let
tailscale_patched = magic {};
in {
services.tailscale = {
enable = true;
package = tailscale_patched;
};
};
```
Signed-off-by: Christine Dodrill <me@christine.website>
These were broken since 2016:
f0367da7d1
since StartLimitIntervalSec got moved into [Unit] from [Service].
StartLimitBurst has also been moved accordingly, so let's fix that one
too.
NixOS systems have been producing logs such as:
/nix/store/wf98r55aszi1bkmln1lvdbp7znsfr70i-unit-caddy.service/caddy.service:31:
Unknown key name 'StartLimitIntervalSec' in section 'Service', ignoring.
I have also removed some unnecessary duplication in units disabling
rate limiting since setting either interval or burst to zero disables it
(ad16158c10/src/basic/ratelimit.c (L16))
Use of Tailscale requires using the `tailscale` CLI to talk to the
daemon. If the CLI isn't in systemPackages, the resulting user experience
is confusing as the Tailscale daemon does nothing.
Signed-off-by: David Anderson <dave@natulte.net>
