No one really cares. Its cost outweighs its usefulness.
name old time/op new time/op delta
HandleBootstrapDNS-10 105ns ± 4% 65ns ± 2% -37.68% (p=0.000 n=15+14)
name old alloc/op new alloc/op delta
HandleBootstrapDNS-10 416B ± 0% 0B -100.00% (p=0.000 n=15+15)
name old allocs/op new allocs/op delta
HandleBootstrapDNS-10 3.00 ± 0% 0.00 -100.00% (p=0.000 n=15+15)
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
Do json formatting once, rather than on every request.
Use an atomic.Value.
name old time/op new time/op delta
HandleBootstrapDNS-10 6.35µs ± 0% 0.10µs ± 4% -98.35% (p=0.000 n=14+15)
name old alloc/op new alloc/op delta
HandleBootstrapDNS-10 3.20kB ± 0% 0.42kB ± 0% -86.99% (p=0.000 n=12+15)
name old allocs/op new allocs/op delta
HandleBootstrapDNS-10 41.0 ± 0% 3.0 ± 0% -92.68% (p=0.000 n=15+15)
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
A large influx of new connections can bring down DERP
since it spins off a new goroutine for each connection,
where each routine may do significant amount of work
(e.g., allocating memory and crunching numbers for TLS crypto).
The momentary spike can cause the process to OOM.
This commit sets the groundwork for limiting connections,
but leaves the limit at infinite by default.
Signed-off-by: Joe Tsai <joetsai@digital-static.net>
This patch adds new functions to be used when accessing system policies,
and revises callers to use the new functions. They first attempt the new
registry path for policies, and if that fails, attempt to fall back to the
legacy path.
We keep non-policy variants of these functions because we should be able to
retain the ability to read settings from locations that are not exposed to
sysadmins for group policy edits.
The remaining changes will be done in corp.
Updates https://github.com/tailscale/tailscale/issues/3584
Signed-off-by: Aaron Klotz <aaron@tailscale.com>
Also fix a somewhat related printing bug in the process where
some paths would print "Success." inconsistently even
when there otherwise was no output (in the EditPrefs path)
Fixes#3830
Updates #3702 (which broke it once while trying to fix it)
Change-Id: Ic51e14526ad75be61ba00084670aa6a98221daa5
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Now that Go 1.17 has module graph pruning
(https://go.dev/doc/go1.17#go-command), we should be able to use
upstream netstack without breaking our private repo's build
that then depends on the tailscale.com Go module.
This is that experiment.
Updates #1518 (the original bug to break out netstack to own module)
Updates #2642 (this updates netstack, but doesn't remove workaround)
Change-Id: I27a252c74a517053462e5250db09f379de8ac8ff
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
So Linux/etc CLI users get helpful advice to run tailscale
with --operator=$USER when they try to 'tailscale file {cp,get}'
but are mysteriously forbidden.
Signed-off-by: David Eger <eger@google.com>
Signed-off-by: David Eger <david.eger@gmail.com>
Disabled by default.
To use, run tailscaled with:
TS_SSH_ALLOW_LOGIN=you@bar.com
And enable with:
$ TAILSCALE_USE_WIP_CODE=true tailscale up --ssh=true
Then ssh [any-user]@[your-tailscale-ip] for a root bash shell.
(both the "root" and "bash" part are temporary)
Updates #3802
Change-Id: I268f8c3c95c8eed5f3231d712a5dc89615a406f0
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
A new package can also later record/report which knobs are checked and
set. It also makes the code cleaner & easier to grep for env knobs.
Change-Id: Id8a123ab7539f1fadbd27e0cbeac79c2e4f09751
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Surveying the fleet prior to turning off old/unused/insecure
TLS versions.
Updates tailscale/corp#3615
Signed-off-by: David Anderson <danderson@tailscale.com>
The GitHub code scanner flagged this as a security vulnerability.
I don't believe it was, but I couldn't convince myself of it 100%.
Err on the safe side and use html/template to generate the HTML,
with all necessary escaping.
Fixestailscale/corp#2698
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
The --reset shouldn't imply that a Backend.Start is necessary. With
this, it can do a Backend.EditPrefs instead, which then doesn't do all
the heavy work that Start does. Also, Start on Windows behaves
slightly differently than Linux etc in some cases because of tailscaled
running in client mode on Windows (where the GUI supplies the prefs).
Fixes#3702
Change-Id: I75c9f08d5e0052bf623074030a3a7fcaa677abf6
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
I apparently only did HTTP before, not HTTPS.
Updates tailscale/corp#1327
Change-Id: I7d5265a0a25fcab5b142c8c3f21a0920f6cae39f
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
But still support hello.ipn.dev for a bit.
Updates tailscale/corp#1327
Change-Id: Iab59cca0b260d69858af16f4e42677e54f9fe54a
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Treat UDP send EPERM errors as a lost UDP packet, not something super
fatal. That's just the Linux firewall preventing it from going out.
And add a leaf package net/neterror for that (and future) policy that
all three packages can share, with tests.
Updates #3619
Change-Id: Ibdb838c43ee9efe70f4f25f7fc7fdf4607ba9c1d
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This is for use by the Windows GUI client to log via when an
exit node is in use, so the logs don't go out via the exit node and
instead go directly, like tailscaled's. The dialer tried to do that
in the unprivileged GUI by binding to a specific interface, but the
"Internet Kill Switch" installed by tailscaled for exit nodes
precludes that from working and instead the GUI fails to dial out.
So, go through tailscaled (with a CONNECT request) instead.
Fixestailscale/corp#3169
Change-Id: I17a8efdc1d4b8fed53a29d1c19995592b651b215
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This moves the Windows-only initialization of the filelogger into
logpolicy. Previously we only did it when babysitting the tailscaled
subprocess, but this meant that log messages from the service itself
never made it to disk. Examples that weren't logged to disk:
* logtail unable to dial out,
* DNS flush messages from the service
* svc.ChangeRequest messages (#3581)
This is basically the same fix as #3571 but staying in the Logf type,
and avoiding build-tagged file (which wasn't quite a goal, but
happened and seemed nice)
Fixes#3570
Co-authored-by: Aaron Klotz <aaron@tailscale.com>
Change-Id: Iacd80c4720b7218365ec80ae143339d030842702
I broke it in 1.17.x sometime while rewiring some logs stuff,
mostly in 0653efb092 (but with a handful
of logs-related changes around that time)
Fixestailscale/corp#3265
Change-Id: Icb5c07412dc6d55f1d9244c5d0b51dceca6a7e34
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
One of the most annoying parts of using the Tailscale CLI on Windows
and the macOS GUI is that Tailscale's GUIs default to running with
"Route All" (accept all non-exitnode subnet routes) but the CLI--being
originally for Linux--uses the Linux default, which is to not accept
subnets.
Which means if a Windows user does, e.g.:
tailscale up --advertise-exit-node
Or:
tailscale up --shields-up
... then it'd warn about reverting the --accept-routes option, which the user
never explicitly used.
Instead, make the CLI's default match the platform/GUI's default.
Change-Id: I15c804b3d9b0266e9ca8651e0c09da0f96c9ef8d
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
fee2d9fad added support for cmd/tailscale to connect to IPNExtension.
It came in two parts: If no socket was provided, dial IPNExtension first,
and also, if dialing the socket failed, fall back to IPNExtension.
The second half of that support caused the integration tests to fail
when run on a machine that was also running IPNExtension.
The integration tests want to wait until the tailscaled instances
that they spun up are listening. They do that by dialing the new
instance. But when that dial failed, it was falling back to IPNExtension,
so it appeared (incorrectly) that tailscaled was running.
Hilarity predictably ensued.
If a user (or a test) explicitly provides a socket to dial,
it is a reasonable assumption that they have a specific tailscaled
in mind and don't want to fall back to IPNExtension.
It is certainly true of the integration tests.
Instead of adding a bool to Connect, split out the notion of a
connection strategy. For now, the implementation remains the same,
but with the details hidden a bit. Later, we can improve that.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This is enough to handle the DNS queries as generated by Go's
net package (which our HTTP/SOCKS client uses), and the responses
generated by the ExitDNS DoH server.
This isn't yet suitable for putting on 100.100.100.100 where a number
of different DNS clients would hit it, as this doesn't yet do
EDNS0. It might work, but it's untested and likely incomplete.
Likewise, this doesn't handle anything about truncation, as the
exchanges are entirely in memory between Go or DoH. That would also
need to be handled later, if/when it's hooked up to 100.100.100.100.
Updates #3507
Change-Id: I1736b0ad31eea85ea853b310c52c5e6bf65c6e2a
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
The caller of func run said:
// No need to log; the func already did
But that wasn't true. Some return paths didn't log.
So instead, return rich errors and have func main do the logging,
so we can't miss anything in the future.
Prior to this, safesocket.Listen for instance was causing tailscaled
to os.Exit(1) on failure without any clue as to why.
Change-Id: I9d71cc4d73d0fed4aa1b1902cae199f584f25793
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
To make ExitDNS cheaper.
Might not finish client-side support in December before 1.20, but at
least server support can start rolling out ahead of clients being
ready for it.
Tested with curl against peerapi.
Updates #1713
Change-Id: I676fed5fb1aef67e78c542a3bc93bddd04dd11fe
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
And simplify, unexport some tsdial/netstack stuff in the the process.
Fixes#3475
Change-Id: I186a5a5cbd8958e25c075b4676f7f6e70f3ff76e
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Before:
failed to connect to local tailscaled (which appears to be running). Got error: Get "http://local-tailscaled.sock/localapi/v0/status": EOF
After:
failed to connect to local tailscaled (which appears to be running as IPNExtension, pid 2118). Got error: Get "http://local-tailscaled.sock/localapi/v0/status": EOF
This was useful just now, as it made it clear that tailscaled I thought
I was connecting to might not in fact be running; there was
a second tailscaled running that made the error message slightly misleading.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
It was using the wrong prefs (intended vs current) to map the current
exit node ID to an IP.
Fixes#3480
Change-Id: I9f117d99a84edddb4cd1cb0df44a2f486abde6c2
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
If you're online, let tailscale up --exit-node=NAME map NAME to its IP.
We don't store the exit node name server-side in prefs, avoiding
the concern raised earlier.
Fixes#3062
Change-Id: Ieea5ceec1a30befc67e9d6b8a530b3cb047b6b40
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This starts to refactor tsdial.Dialer's name resolution to have
different stages: in-memory MagicDNS vs system resolution. A future
change will plug in ExitDNS resolution.
This also plumbs a Dialer into netstack and unexports the dnsMap
internals.
And it removes some of the async AddNetworkMapCallback usage and
replaces it with synchronous updates of the Dialer's netmap
from LocalBackend, since the LocalBackend has the Dialer too.
Updates #3475
Change-Id: Idcb7b1169878c74f0522f5151031ccbc49fe4cb4
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
