Commit Graph

80 Commits (1f22507c06c8b700fbed191e494f886785571bd4)

Author SHA1 Message Date
Josh Bleecher Snyder 97a01b7b17 util/deephash: remove Tailscale toolchain compatibility shim
The future is now.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
3 years ago
Josh Bleecher Snyder 463728a885 util/netconv: add package to convert between netip and netaddr types
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
3 years ago
Aaron Klotz 82cd98609f util/winutil: migrate corp's winutil into OSS.
It makes the most sense to have all our utility functions reside in one place.
There was nothing in corp that could not reasonably live in OSS.

I also updated `StartProcessAsChild` to no longer depend on `futureexec`,
thus reducing the amount of code that needed migration. I tested this change
with `tswin` and it is working correctly.

I have a follow-up PR to remove the corresponding code from corp.

The migrated code was mostly written by @alexbrainman.
Sourced from corp revision 03e90cfcc4dd7b8bc9b25eb13a26ec3a24ae0ef9

Signed-off-by: Aaron Klotz <aaron@tailscale.com>
3 years ago
Aaron Klotz 3a74f2d2d7 cmd/tailscaled, util/winutil: add accessor functions for Windows system policies.
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>
3 years ago
Brad Fitzpatrick 0626cf4183 util/winutil: fix build
It was broken on Windows:

Error: util\winutil\winutil_windows.go:15:7: regBase redeclared in this block
Error:                                       D:\a\tailscale\tailscale\util\winutil\winutil_notwindows.go:7:17: previous declaration
Error: util\winutil\winutil_windows.go:29:6: getRegString redeclared in this block
Error:                                       D:\a\tailscale\tailscale\util\winutil\winutil_notwindows.go:9:40: previous declaration
Error: util\winutil\winutil_windows.go:47:6: getRegInteger redeclared in this block
Error:                                       D:\a\tailscale\tailscale\util\winutil\winutil_notwindows.go:11:48: previous declaration
Error: util\winutil\winutil_windows.go:77:6: isSIDValidPrincipal redeclared in this block
Error:                                       D:\a\tailscale\tailscale\util\winutil\winutil_notwindows.go:13:38: previous declaration

Change-Id: Ib1ce4b647f5711547840c736b933a6c42bf09583
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Aaron Klotz d7962e3bcf ipn/ipnserver, util/winutil: update workaround for os/user.LookupId failures on Windows to reject SIDs from deleted/invalid security principals.
Our current workaround made the user check too lax, thus allowing deleted
users. This patch adds a helper function to winutil that checks that the
uid's SID represents a valid Windows security principal.

Now if `lookupUserFromID` determines that the SID is invalid, we simply
propagate the error.

Updates https://github.com/tailscale/tailscale/issues/869

Signed-off-by: Aaron Klotz <aaron@tailscale.com>
3 years ago
Brad Fitzpatrick 486059589b all: gofmt -w -s (simplify) tests
And it updates the build tag style on a couple files.

Change-Id: I84478d822c8de3f84b56fa1176c99d2ea5083237
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 0de1b74fbb util/clientmetric: add tests omitted from earlier commit
These were supposed to be part of
3b541c833e but I guess I forgot to "git
add" them. Whoops.

Updates #3307

Change-Id: I8c768a61ec7102a01799e81dc502a22399b9e9f0
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 5b5f032c9a util/clientmetric: optimize memory layout for finding updates
Updates #3307

Change-Id: I2840b190583467cc3f00688b96ce3d170df46a46
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 3b541c833e util/clientmetric, logtail: log metric changes
Updates #3307

Change-Id: I1399ebd786f6ff7defe6e11c0eb651144c071574
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 57b039c51d util/clientmetrics: add new package to add metrics to the client
And annotate magicsock as a start.

And add localapi and debug handlers with the Prometheus-format
exporter.

Updates #3307

Change-Id: I47c5d535fe54424741df143d052760387248f8d3
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
David Anderson 0532eb30db all: replace tailcfg.DiscoKey with key.DiscoPublic.
Signed-off-by: David Anderson <danderson@tailscale.com>
3 years ago
Josh Bleecher Snyder 3fd5f4380f util/multierr: new package
github.com/go-multierror/multierror served us well.
But we need a few feature from it (implement Is),
and it's not worth maintaining a fork of such a small module.

Instead, I did a clean room implementation inspired by its API.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
3 years ago
David Anderson a9c78910bd wgengine/wgcfg: convert to use new node key type.
Updates #3206

Signed-off-by: David Anderson <danderson@tailscale.com>
3 years ago
Aaron Klotz c6ea282b3f utils/winutil utils/winutil/vss: add utility function for extracting data from Windows System Restore Point backups.
utils/winutil/vss contains just enough COM wrapping to query the Volume Shadow Copy service for snapshots.
WalkSnapshotsForLegacyStateDir is the friendlier interface that adds awareness of our actual use case,
mapping the snapshots and locating our legacy state directory.

Updates #3011

Signed-off-by: Aaron Klotz <aaron@tailscale.com>
3 years ago
Brad Fitzpatrick 0410f1a35a util/groupmember: adjust build tags for osusergo
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 2a0d3f72c5 util/groupmember: fix typo of package's name in its package doc
And canonicalize a func comment while I'm here.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Aaron Klotz 3386a86fe5 util/winutil: add GetRegInteger
This helper allows us to retrieve `DWORD` and `QWORD` values from the Tailscale key in the Windows registry.

Signed-off-by: Aaron Klotz <aaron@tailscale.com>
3 years ago
Josh Bleecher Snyder b14db5d943 util/codegen: reorder AssertStructUnchanged args
The fully qualified name of the type is thisPkg.tname,
so write the args like that too.

Suggested-by: Joe Tsai <joetsai@digital-static.net>
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
3 years ago
Josh Bleecher Snyder 3cd85c0ca6 util/codegen: add ContainsPointers
And use it in cmd/cloner.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
3 years ago
Josh Bleecher Snyder d8a8f70000 util/codegen: add NamedTypes
And use it in cmd/cloner.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
3 years ago
Josh Bleecher Snyder 618376dbc0 util/codegen: add AssertStructUnchanged
Refactored out from cmd/cloner.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
3 years ago
Josh Bleecher Snyder fb66ff7c78 util/codegen: add package
This is a package for shared utilities used in doing codegen programs.
The inaugural API is for writing gofmt'd code to a file.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
3 years ago
David Anderson bb10443edf wgengine/wgcfg: use just the hexlified node key as the WireGuard endpoint.
The node key is all magicsock needs to find the endpoint that WireGuard
needs.

Updates #2752

Signed-off-by: David Anderson <danderson@tailscale.com>
3 years ago
David Anderson 54bc3b7d97 util/deephash: remove soon to be deleted field from wgcfg.
Signed-off-by: David Anderson <danderson@tailscale.com>
3 years ago
Joe Tsai 3f1317e3e5
util/deephash: fix TestArrayAllocs
Unfortunately this test fails on certain architectures.
The problem comes down to inconsistencies in the Go escape analysis
where specific variables are marked as escaping on certain architectures.
The variables escaping to the heap are unfortunately in crypto/sha256,
which makes it impossible to fixthis locally in deephash.

For now, fix the test by compensating for the allocations that
occur from calling sha256.digest.Sum.

See golang/go#48055

Fixes #2727

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
3 years ago
slowy07 ac0353e982 fix: typo spelling grammar
Signed-off-by: slowy07 <slowy.arfy@gmail.com>
3 years ago
David Crawshaw 360223fccb types/dnstype: introduce new package for Resolver
So the type can be used in net/dns without introducing a tailcfg
dependency.

For #2596

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
3 years ago
Josh Bleecher Snyder a5da4ed981 all: gofmt with Go 1.17
This adds "//go:build" lines and tidies up existing "// +build" lines.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
3 years ago
Joe Tsai 9d0c86b6ec
util/deephash: remove unnecessary formatting for structs and slices (#2571)
The index for every struct field or slice element and
the number of fields for the struct is unncessary.

The hashing of Go values is unambiguous because every type (except maps)
encodes in a parsable manner. So long as we know the type information,
we could theoretically decode every value (except for maps).

At a high level:
* numbers are encoded as fixed-width records according to precision.
* strings (and AppendTo output) are encoded with a fixed-width length,
followed by the contents of the buffer.
* slices are prefixed by a fixed-width length, followed by the encoding
of each value. So long as we know the type of each element, we could
theoretically decode each element.
* arrays are encoded just like slices, but elide the length
since it is determined from the Go type.
* maps are encoded first with a byte indicating whether it is a cycle.
If a cycle, it is followed by a fixed-width index for the pointer,
otherwise followed by the SHA-256 hash of its contents. The encoding of maps
is not decodeable, but a SHA-256 hash is sufficient to avoid ambiguities.
* interfaces are encoded first with a byte indicating whether it is nil.
If not nil, it is followed by a fixed-width index for the type,
and then the encoding for the underlying value. Having the type be encoded
first ensures that the value could theoretically be decoded next.
* pointers are encoded first with a byte indicating whether it is
1) nil, 2) a cycle, or 3) newly seen. If a cycle, it is followed by
a fixed-width index for the pointer. If newly seen, it is followed by
the encoding for the pointed-at value.

Removing unnecessary details speeds up hashing:

	name              old time/op    new time/op    delta
	Hash-8              76.0µs ± 1%    55.8µs ± 2%  -26.62%        (p=0.000 n=10+10)
	HashMapAcyclic-8    61.9µs ± 0%    62.0µs ± 0%     ~             (p=0.666 n=9+9)
	TailcfgNode-8       10.2µs ± 1%     7.5µs ± 1%  -26.90%         (p=0.000 n=10+9)
	HashArray-8         1.07µs ± 1%    0.70µs ± 1%  -34.67%         (p=0.000 n=10+9)

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
3 years ago
Joe Tsai d8fbce7eef
util/deephash: hash uint{8,16,32,64} explicitly (#2502)
Instead of hashing the humanly formatted forms of a number,
hash the native machine bits of the integers themselves.

There is a small performance gain for this:
	name              old time/op    new time/op    delta
	Hash-8              75.7µs ± 1%    76.0µs ± 2%    ~            (p=0.315 n=10+9)
	HashMapAcyclic-8    63.1µs ± 3%    61.3µs ± 1%  -2.77%        (p=0.000 n=10+10)
	TailcfgNode-8       10.3µs ± 1%    10.2µs ± 1%  -1.48%        (p=0.000 n=10+10)
	HashArray-8         1.07µs ± 1%    1.05µs ± 1%  -1.79%        (p=0.000 n=10+10)

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
3 years ago
Joe Tsai 01d4dd331d
util/deephash: simplify hasher.hashMap (#2503)
The swapping of bufio.Writer between hasher and mapHasher is subtle.
Just embed a hasher in mapHasher to avoid complexity here.

No notable change in performance:
	name              old time/op    new time/op    delta
	Hash-8              76.7µs ± 1%    77.0µs ± 1%    ~            (p=0.182 n=9+10)
	HashMapAcyclic-8    62.4µs ± 1%    62.5µs ± 1%    ~            (p=0.315 n=10+9)
	TailcfgNode-8       10.3µs ± 1%    10.3µs ± 1%  -0.62%         (p=0.004 n=10+9)
	HashArray-8         1.07µs ± 1%    1.06µs ± 1%  -0.98%          (p=0.001 n=8+9)

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
3 years ago
Joe Tsai d145c594ad
util/deephash: improve cycle detection (#2470)
The previous algorithm used a map of all visited pointers.
The strength of this approach is that it quickly prunes any nodes
that we have ever visited before. The detriment of the approach
is that pruning is heavily dependent on the order that pointers
were visited. This is especially relevant for hashing a map
where map entries are visited in a non-deterministic manner,
which would cause the map hash to be non-deterministic
(which defeats the point of a hash).

This new algorithm uses a stack of all visited pointers,
similar to how github.com/google/go-cmp performs cycle detection.
When we visit a pointer, we push it onto the stack, and when
we leave a pointer, we pop it from the stack.
Before visiting a pointer, we first check whether the pointer exists
anywhere in the stack. If yes, then we prune the node.
The detriment of this approach is that we may hash a node more often
than before since we do not prune as aggressively.

The set of visited pointers up until any node is only the
path of nodes up to that node and not any other pointers
that may have been visited elsewhere. This provides us
deterministic hashing regardless of visit order.
We can now delete hashMapFallback and associated complexity,
which only exists because the previous approach was non-deterministic
in the presence of cycles.

This fixes a failure of the old algorithm where obviously different
values are treated as equal because the pruning was too aggresive.
See https://github.com/tailscale/tailscale/issues/2443#issuecomment-883653534

The new algorithm is slightly slower since it prunes less aggresively:
	name              old time/op    new time/op    delta
	Hash-8              66.1µs ± 1%    68.8µs ± 1%   +4.09%        (p=0.000 n=19+19)
	HashMapAcyclic-8    63.0µs ± 1%    62.5µs ± 1%   -0.76%        (p=0.000 n=18+19)
	TailcfgNode-8       9.79µs ± 2%    9.88µs ± 1%   +0.95%        (p=0.000 n=19+17)
	HashArray-8          643ns ± 1%     653ns ± 1%   +1.64%        (p=0.000 n=19+19)
However, a slower but more correct algorithm seems
more favorable than a faster but incorrect algorithm.

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
3 years ago
Joe Tsai d666bd8533
util/deephash: disambiguate hashing of AppendTo (#2483)
Prepend size to AppendTo output.

Fixes #2443

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
3 years ago
Joe Tsai 23ad028414
util/deephash: include type as part of hash for interfaces (#2476)
A Go interface may hold any number of different concrete types.
Just because two underlying values hash to the same thing
does not mean the two values are identical if they have different
concrete types. As such, include the type in the hash.
3 years ago
Joe Tsai a5fb8e0731
util/deephash: introduce deliberate instability (#2477)
Seed the hash upon first use with the current time.
This ensures that the stability of the hash is bounded within
the lifetime of one program execution.
Hopefully, this prevents future bugs where someone assumes that
this hash is stable.

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
3 years ago
Joe Tsai 9a0c8bdd20 util/deephash: make hash type opaque
The fact that Hash returns a [sha256.Size]byte leaks details about
the underlying hash implementation. This could very well be any other
hashing algorithm with a possible different block size.

Abstract this implementation detail away by declaring an opaque type
that is comparable. While we are changing the signature of UpdateHash,
rename it to just Update to reduce stutter (e.g., deephash.Update).

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
3 years ago
Brad Fitzpatrick ddb8726c98 util/deephash: don't reflect.Copy if element type is a defined uint8
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick df176c82f5 util/deephash: skip alloc test under race detector
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 6dc38ff25c util/deephash: optimize hashing of byte arrays, reduce allocs in Hash
name              old time/op    new time/op    delta
Hash-6               173µs ± 4%     101µs ± 3%   -41.69%  (p=0.000 n=10+9)
HashMapAcyclic-6     101µs ± 5%     105µs ± 3%    +3.52%  (p=0.001 n=9+10)
TailcfgNode-6       29.4µs ± 2%    16.4µs ± 3%   -44.25%  (p=0.000 n=8+10)

name              old alloc/op   new alloc/op   delta
Hash-6              3.60kB ± 0%    1.13kB ± 0%   -68.70%  (p=0.000 n=10+10)
HashMapAcyclic-6    2.53kB ± 0%    2.53kB ± 0%      ~     (p=0.137 n=10+8)
TailcfgNode-6         528B ± 0%        0B       -100.00%  (p=0.000 n=10+10)

name              old allocs/op  new allocs/op  delta
Hash-6                84.0 ± 0%      40.0 ± 0%   -52.38%  (p=0.000 n=10+10)
HashMapAcyclic-6       202 ± 0%       202 ± 0%      ~     (all equal)
TailcfgNode-6         11.0 ± 0%       0.0       -100.00%  (p=0.000 n=10+10)

Updates tailscale/corp#2130

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 3962744450 util/deephash: prevent infinite loop on map cycle
Fixes #2340

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick aceaa70b16 util/deephash: move funcs to methods
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 14f901da6d util/deephash: fix sync.Pool usage
Whoops.

From yesterday's 9ae3bd0939 (not yet
used by anything, fortunately)

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick e0258ffd92 util/deephash: use keyed struct literal, fix vet
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick bf9f279768 util/deephash: optimize CPU a bit by by avoiding fmt in more places
name              old time/op    new time/op    delta
Hash-6               179µs ± 5%     173µs ± 4%   -3.12%  (p=0.004 n=10+10)
HashMapAcyclic-6     115µs ± 3%     101µs ± 5%  -11.51%  (p=0.000 n=9+9)
TailcfgNode-6       30.8µs ± 4%    29.4µs ± 2%   -4.51%  (p=0.000 n=10+8)

name              old alloc/op   new alloc/op   delta
Hash-6              3.60kB ± 0%    3.60kB ± 0%     ~     (p=0.445 n=9+10)
HashMapAcyclic-6    2.53kB ± 0%    2.53kB ± 0%     ~     (p=0.065 n=9+10)
TailcfgNode-6         528B ± 0%      528B ± 0%     ~     (all equal)

name              old allocs/op  new allocs/op  delta
Hash-6                84.0 ± 0%      84.0 ± 0%     ~     (all equal)
HashMapAcyclic-6       202 ± 0%       202 ± 0%     ~     (all equal)
TailcfgNode-6         11.0 ± 0%      11.0 ± 0%     ~     (all equal)

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 58f2ef6085 util/deephash: add a benchmark and some benchmark data
No code changes.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 9ae3bd0939 util/deephash: export a Hash func for use by the control plane
name              old time/op    new time/op    delta
Hash-6              69.4µs ± 6%    68.4µs ± 4%     ~     (p=0.286 n=9+9)
HashMapAcyclic-6     115µs ± 5%     115µs ± 4%     ~     (p=1.000 n=10+10)

name              old alloc/op   new alloc/op   delta
Hash-6              2.29kB ± 0%    1.88kB ± 0%  -18.13%  (p=0.000 n=10+10)
HashMapAcyclic-6    2.53kB ± 0%    2.53kB ± 0%     ~     (all equal)

name              old allocs/op  new allocs/op  delta
Hash-6                58.0 ± 0%      54.0 ± 0%   -6.90%  (p=0.000 n=10+10)
HashMapAcyclic-6       202 ± 0%       202 ± 0%     ~     (all equal)

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 700badd8f8 util/deephash: move internal/deephash to util/deephash
No code changes. Just a minor package doc addition about lack of API
stability.
3 years ago
David Crawshaw 6b9f8208f4 net/dns: do not run wsl.exe as LocalSystem
It doesn't work. It needs to run as the user.

	https://github.com/microsoft/WSL/issues/4803

The mechanism for doing this was extracted from:

	https://web.archive.org/web/20101009012531/http://blogs.msdn.com/b/winsdk/archive/2009/07/14/launching-an-interactive-process-from-windows-service-in-windows-vista-and-later.aspx

While here, we also reclaculate WSL distro set on SetDNS.
This accounts for:

	1. potential inability to access wsl.exe on startup
	2. WSL being installed while Tailscale is running
	3. A new WSL distrobution being installed

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
3 years ago
Maisem Ali f944614c5c cmd/tailscale/web: add support for QNAP
Signed-off-by: Maisem Ali <maisem@tailscale.com>
3 years ago