On Windows, the idiomatic way to check access on a named pipe is for
the server to impersonate the client on its current OS thread, perform
access checks using the client's access token, and then revert the OS
thread's access token back to its true self.
The access token is a better representation of the client's rights than just
a username/userid check, as it represents the client's effective rights
at connection time, which might differ from their normal rights.
This patch updates safesocket to do the aforementioned impersonation,
extract the token handle, and then revert the impersonation. We retain
the token handle for the remaining duration of the connection (the token
continues to be valid even after we have reverted back to self).
Since the token is a property of the connection, I changed ipnauth to wrap
the concrete net.Conn to include the token. I then plumbed that change
through ipnlocal, ipnserver, and localapi as necessary.
I also added a PermitLocalAdmin flag to the localapi Handler which I intend
to use for controlling access to a few new localapi endpoints intended
for configuring auto-update.
Updates https://github.com/tailscale/tailscale/issues/755
Signed-off-by: Aaron Klotz <aaron@tailscale.com>
PR #9217 attempted to fix the same issue, but suffered from not letting the
user connect to non-oss tailscaled if something was listening on the socket, as
the --socket flag doesn't let you select the mac apps.
Rather than leave the user unable to choose, we keep the mac/socket preference
order the same and check a bit harder whether the macsys version really is
running. Now, we prefer the App Store Tailscale (even if it's Stopped) and you
can use --socket to sswitch. But if you quit the App Store Tailscale, we'll try
the socket without needing the flag.
Fixes#5761
Signed-off-by: Paul Scott <408401+icio@users.noreply.github.com>
I manually tested that the code path that relaxes pipe permissions is
not executed when run with elevated priviliges, and the test also passes
in that case.
Updates #7876
Signed-off-by: James Tucker <jftucker@gmail.com>
We accidentally switched to ./tool/go in
4022796484 which resulted in no longer
running Windows builds, as this is attempting to run a bash script.
I was unable to quickly fix the various tests that have regressed, so
instead I've added skips referencing #7876, which we need to back and
fix.
Updates #7262
Updates #7876
Signed-off-by: James Tucker <james@tailscale.com>
This updates all source files to use a new standard header for copyright
and license declaration. Notably, copyright no longer includes a date,
and we now use the standard SPDX-License-Identifier header.
This commit was done almost entirely mechanically with perl, and then
some minimal manual fixes.
Updates #6865
Signed-off-by: Will Norris <will@tailscale.com>
The //go:build syntax was introduced in Go 1.17:
https://go.dev/doc/go1.17#build-lines
gofmt has kept the +build and go:build lines in sync since
then, but enough time has passed. Time to remove them.
Done with:
perl -i -npe 's,^// \+build.*\n,,' $(git grep -l -F '+build')
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
The io/ioutil package has been deprecated as of Go 1.16 [1]. This commit
replaces the existing io/ioutil functions with their new definitions in
io and os packages.
Reference: https://golang.org/doc/go1.16#ioutil
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
Tested three macOS Tailscale daemons:
- App Store (Network Extension)
- Standalone (macsys)
- tailscaled
And two types of local IPC each:
- IPN
- HTTP
And two CLI modes:
- sandboxed (running the GUI binary as the CLI; normal way)
- open source CLI hitting GUI (with #4525)
Bonus: simplifies the code.
Fixestailscale/corp#4559
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>
Instead of logging lsof execution failures to stdout,
incorporate them into the returned error.
While we're here, make it clear that the file
success case always returns a nil error.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This allows the test to be run inside a mounted filesystem,
which I'm doing now as a I develop on a linux VM.
Fixes#2367.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
Without this, `tailscale status` ignores the --socket flag on macOS and
always talks to the IPNExtension, even if you wanted it to inspect a
userspace tailscaled.
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
Previously the CLI could only find the HTTP auth token when running
the CLI outside the sandbox, not like
/Applications/Tailscale.app/Contents/MacOS/Tailscale when that was
from the App Store.
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
And open up socket permissions like Linux, now that we know who
connections are from.
This uses the new inet.af/peercred that supports Linux and Darwin at
the moment.
Fixes#1347Fixes#1348
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Continuation of earlier two umask changes,
5611f290eb and
d6e9fb1df0.
This change mostly affects us, running tailscaled as root by hand (wit
a umask of 0077), not under systemd. End users running tailscaled
under systemd won't have a umask.
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This partially reverts d6e9fb1df0, which modified the permissions
on the tailscaled Unix socket and thus required "sudo tailscale" even
for "tailscale status".
Instead, open the permissions back up (on Linux only) but have the
server look at the peer creds and only permit read-only actions unless
you're root.
In the future we'll also have a group that can do mutable actions.
On OpenBSD and FreeBSD, the permissions on the socket remain locked
down to 0600 from d6e9fb1df0.
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Brad Fitzpatrick
Aaron Klotz
Skip Tavakkolian
Paul Scott
James Tucker
James Tucker
Maisem Ali
Will Norris
Eng Zer Jun
Mihai Parparita
Josh Bleecher Snyder
slowy07
Josh Bleecher Snyder
David Crawshaw
Denton Gentry
Brad Fitzpatrick