Added implementations for *io/fs.subFS, os.DirFS, and testing/fstest.MapFS.
Amended testing/fstest.TestFS to check behavior.
Addressed TODOs in archive/tar and os.CopyFS around symbolic links.
I am deliberately not changing archive/zip in this CL,
since it currently does not resolve symlinks
as part of its filesystem implementation.
I am unsure of the compatibility restrictions on doing so,
so figured it would be better to address independently.
testing/fstest.MapFS now includes resolution of symlinks,
with MapFile.Data storing the symlink data.
The behavior change there seemed less intrusive,
especially given its intended usage in tests,
and it is especially helpful in testing the io/fs function implementations.
Fixes#49580
Change-Id: I58ec6915e8cc97341cdbfd9c24c67d1b60139447
Reviewed-on: https://go-review.googlesource.com/c/go/+/385534
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Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: Funda Secgin <fundasecgin33@gmail.com>
This updates the new version API for the discussion on #63952.
Note that the current tests do not have symbols with hidden versions.
Leaving that for later.
For #63952
Change-Id: I1ad4b1e485429a216ba8e5b68f7f4299d120628f
Reviewed-on: https://go-review.googlesource.com/c/go/+/637235
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Austin Clements <austin@google.com>
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This updates the new version API for the discussion on #63952.
This change reveals that in fact none of the tests set the
VERSYM_HIDDEN bit. The code before this CL set the hidden flag
for symbols that appear in DynamicVersionNeed, but that is not
an accurate representation of the ELF. The readelf program
does print undefined symbols that way (with a single '@'),
but that doesn't mean that the hidden flag is set.
Leaving tests with the hidden bit set for later.
For #63952
Change-Id: Ida60831e0c9922dfc10f10c7a64bc76a2b197537
Reviewed-on: https://go-review.googlesource.com/c/go/+/635079
Reviewed-by: Austin Clements <austin@google.com>
Commit-Queue: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
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This makes three related changes that work particularly well together
and would require significant extra work to do separately: it replaces
X25519Kyber768Draft00 with X25519MLKEM768, it makes CurvePreferences
ordering crypto/tls-selected, and applies a preference to PQ key
exchange methods over key shares (to mitigate downgrades).
TestHandshakeServerUnsupportedKeyShare was removed because we are not
rejecting unsupported key shares anymore (nor do we select them, and
rejecting them actively is a MAY). It would have been nice to keep the
test to check we still continue successfully, but testClientHelloFailure
is broken in the face of any server-side behavior which requires writing
any other messages back to the client, or reading them.
Updates #69985Fixes#69393
Change-Id: I58de76f5b8742a9bd4543fd7907c48e038507b19
Reviewed-on: https://go-review.googlesource.com/c/go/+/630775
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
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This commit exposes the crypto/internal/mlkem package as a public crypto
package based on the linked proposal. Since we've already implemented
this internal to the FIPS boundary this largely defers to that
implementation.
Updates #70122
Change-Id: I5ec9c2783c4d44583244c6d16597704a51e9b738
Reviewed-on: https://go-review.googlesource.com/c/go/+/630240
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
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This package holds only the Enabled() function.
Updates #70123
Change-Id: If0e731724d9997001fa52002fa6ae72df4eb16ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/631017
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
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Reviewed-by: Daniel McCarney <daniel@binaryparadox.net>
Implement the SHA-3 hash algorithms and the SHAKE extendable output
functions defined in FIPS 202.
This is a wrapper for crypto/internal/fips/sha3 which in turn was ported
from x/crypto/sha3 in CL 616717 as part of #65269.
Fixes#69982
Change-Id: I64ce7f362c1a773f7f5b05f7e0acb4110e52a329
Reviewed-on: https://go-review.googlesource.com/c/go/+/629176
Reviewed-by: Russ Cox <rsc@golang.org>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
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Implement support for parsing the various policy related extensions,
and for validating the policy graph for chains.
Policy validation is only run if VerifyOptions.CertificatePolicies is
set. Policy validation is run after chains are built. If the computed
policy graph for a chain is invalid, the chain is removed from the set
of returned chains.
This implements the RFC 5280 algorithm as updated by
RFC 9618 [0].
Fixes#68484
[0] https://www.rfc-editor.org/rfc/rfc9618.html
Change-Id: I576432a47ddc404cba966c2b1995365944b8bd26
Reviewed-on: https://go-review.googlesource.com/c/go/+/628616
Auto-Submit: Roland Shoemaker <roland@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Daniel McCarney <daniel@binaryparadox.net>
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Add an UnencryptedHTTP2 protocol value.
Both Server and Transport implement "HTTP/2 with prior knowledge"
as described in RFC 9113, section 3.3. Neither supports the
deprecated HTTP/2 upgrade mechanism (RFC 7540, section 3.2 "h2c").
For Server, UnencryptedHTTP2 controls whether the server
will accept HTTP/2 connections on unencrypted ports.
When enabled, the server checks new connections for
the HTTP/2 preface and routes them appropriately.
For Transport, enabling UnencryptedHTTP2 and disabling HTTP1
causes http:// requests to be made over unencrypted HTTP/2
connections.
For #67816
Change-Id: I2763c4cdec1c2bc6bb8157edb93b94377de8a59b
Reviewed-on: https://go-review.googlesource.com/c/go/+/622976
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Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit imports the x/crypto/hkdf package as a public crypto package
based on the linked proposal. Since we've already implemented this
internal to the FIPS boundary (mod some small changes based on the
proposal discussion) this largely defers to that implementation.
Updates #61477
Change-Id: Ie3dcee75314dfbe22eec8b31c43c926fe80637bb
Reviewed-on: https://go-review.googlesource.com/c/go/+/630296
Reviewed-by: Filippo Valsorda <filippo@golang.org>
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Reviewed-by: Russ Cox <rsc@golang.org>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
Adds support for server-side ECH.
We make a couple of implementation decisions that are not completely
in-line with the spec. In particular, we don't enforce that the SNI
matches the ECHConfig public_name, and we implement a hybrid
shared/backend mode (rather than shared or split mode, as described in
Section 7). Both of these match the behavior of BoringSSL.
The hybrid server mode will either act as a shared mode server, where-in
the server accepts "outer" client hellos and unwraps them before
processing the "inner" hello, or accepts bare "inner" hellos initially.
This lets the server operate either transparently as a shared mode
server, or a backend server, in Section 7 terminology. This seems like
the best implementation choice for a TLS library.
Fixes#68500
Change-Id: Ife69db7c1886610742e95e76b0ca92587e6d7ed4
Reviewed-on: https://go-review.googlesource.com/c/go/+/623576
Reviewed-by: Filippo Valsorda <filippo@golang.org>
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Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
This commit imports the x/crypto/pbkdf2 package as described in the
linked proposal. The code is unchanged with the exception of a few
small updates to reflect feedback from the proposal comment period:
* the Key function is made generic over a hash.Hash
* the h function is moved to be the first argument
* keyLen is renamed to keyLength
* an error return is added
* the unit tests were moved to the pbkdf2_test package
Updates #69488
Change-Id: If72f854daeb65a5c7fbe45ebd341e63a33340624
Reviewed-on: https://go-review.googlesource.com/c/go/+/628135
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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For #67002
Change-Id: If919ee8a5e3d90e91c7848330762e3254245fba1
Reviewed-on: https://go-review.googlesource.com/c/go/+/629555
Reviewed-by: Ian Lance Taylor <iant@google.com>
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For #67002
Change-Id: Ib687c92d645b9172677e5781a3e51ef1a0427c30
Reviewed-on: https://go-review.googlesource.com/c/go/+/629518
Reviewed-by: Ian Lance Taylor <iant@google.com>
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For #67002
Change-Id: I0903f45dbb4c44ea0280c340c96c5f3c3c0781be
Reviewed-on: https://go-review.googlesource.com/c/go/+/627475
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Quim Muntal <quimmuntal@gmail.com>
For #67002
Change-Id: Ibbf44c0bf62f53695a7399ba0dae5b84d5efd374
Reviewed-on: https://go-review.googlesource.com/c/go/+/627076
Reviewed-by: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Add os.Root, a type which represents a directory and permits performing
file operations within that directory.
For #67002
Change-Id: I863f4f1bc320a89b1125ae4237761f3e9320a901
Reviewed-on: https://go-review.googlesource.com/c/go/+/612136
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Quim Muntal <quimmuntal@gmail.com>
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Add a new function, WithDataIndependentTiming, which takes a function as
an argument, and encloses it with calls to set/unset the DIT PSTATE bit
on Arm64.
Since DIT is OS thread-local, for the duration of the execution of
WithDataIndependentTiming, we lock the goroutine to the OS thread, using
LockOSThread. For long running operations, this is likely to not be
performant, but we expect this to be tightly scoped around cryptographic
operations that have bounded execution times.
If locking to the OS thread turns out to be too slow, another option is
to add a bit to the g state indicating if a goroutine has DIT enabled,
and then have the scheduler enable/disable DIT when scheduling a g.
Additionally, we add a new GODEBUG, dataindependenttiming, which allows
setting DIT for an entire program. Running a program with
dataindependenttiming=1 enables DIT for the program during
initialization. In an ideal world PSTATE.DIT would be inherited from
the parent thread, so we'd only need to set it in the main thread and
then all subsequent threads would inherit the value. While this does
happen in the Linux kernel [0], it is not the case for darwin [1].
Rather than add complex logic to only set it on darwin for each new
thread, we just unconditionally set it in mstart1 and cgocallbackg1
regardless of the OS. DIT will already impose some overhead, and the
cost of setting the bit is only ~two instructions (CALL, MSR), so it
should be cheap enough.
Fixes#66450
Updates #49702
[0] e8bdb3c8be/arch/arm64/kernel/process.c (L373)
[1] 8d741a5de7/osfmk/arm64/status.c (L1666)
Change-Id: I78eda691ff9254b0415f2b54770e5850a0179749
Reviewed-on: https://go-review.googlesource.com/c/go/+/598336
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
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The updates are:
- API documentation changes.
- Removal of the old package documentation discouraging linkname.
- Addition of new package documentation with some advice.
- Renaming of weak.Pointer.Strong -> weak.Pointer.Value.
Fixes#67552.
Change-Id: Ifad7e629b6d339dacaf2ca37b459d7f903e31bf8
Reviewed-on: https://go-review.googlesource.com/c/go/+/628455
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Auto-Submit: Michael Knyszek <mknyszek@google.com>
This change introduces AddCleanup to the runtime package. AddCleanup attaches
a cleanup function to an pointer to an object.
The Stop method on Cleanups will be implemented in a followup CL.
AddCleanup is intended to be an incremental improvement over
SetFinalizer and will result in SetFinalizer being deprecated.
For #67535
Change-Id: I99645152e3fdcee85fcf42a4f312c6917e8aecb1
Reviewed-on: https://go-review.googlesource.com/c/go/+/627695
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This adds a package-level variable, slog.DiscardHandler, which is a
slog.Handler which performs no output. This serves a similar purpose
to io.Discard.
Fixes#62005
Change-Id: Ia8babc55f860dec9b663a5c400090a7669608fd5
GitHub-Last-Rev: 0a611174ee8819a2f4e1b8e196a60d5acc6ef9f7
GitHub-Pull-Request: golang/go#70296
Reviewed-on: https://go-review.googlesource.com/c/go/+/626486
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
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Fixes#63952
Change-Id: Icf93e57e62243d9c3306d4e1c5dadb3f62747710
GitHub-Last-Rev: 5c2952760063474f3aac338fe5bdb65bde238ab6
GitHub-Pull-Request: golang/go#69850
Reviewed-on: https://go-review.googlesource.com/c/go/+/619077
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: David Chase <drchase@google.com>
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Support configuring which HTTP version(s) a server or client use
via an explicit set of protocols. The Protocols field takes
precedence over TLSNextProto and ForceAttemptHTTP2.
Fixes#67814
Change-Id: I09ece88f78ad4d98ca1f213157b5f62ae11e063f
Reviewed-on: https://go-review.googlesource.com/c/go/+/607496
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Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Default, use hash function in the runtime package.
If the build tag is purego or raw memory cannot be hash directly,
use reflect get each field to hash separately.
Fixes#54670
Change-Id: Ic968864c9c3c51883967d4f6dc24432385c7dc79
GitHub-Last-Rev: 5ae8a28834c8b809a52c74617e2a8530acec8095
GitHub-Pull-Request: golang/go#69166
Reviewed-on: https://go-review.googlesource.com/c/go/+/609761
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
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Initial implementation for testing.B.Loop,
right now the calculation of b.N are still done in the old fasion way,
as of now b.Loop is merely an alias for the old loop over b.N.
For #61515.
Change-Id: If211d0acc5f0c33df530096dceafe0b947ab0c8e
Reviewed-on: https://go-review.googlesource.com/c/go/+/608798
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Add a field to Server and Transport containing HTTP/2 configuration
parameters.
This field will have no effect until golang.org/x/net/http2 is updated
to make use of it, and h2_bundle.go is updated with the new http2
package.
For #67813
Change-Id: I81d7f8e9ddea78f9666383983aec43e3884c13ed
Reviewed-on: https://go-review.googlesource.com/c/go/+/602175
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Fixes#51473.
Change-Id: Ic868790f480b21b472c98b39be797bcffb1fa892
Reviewed-on: https://go-review.googlesource.com/c/go/+/564142
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
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Adds a new Context method to testing.T, that returns a context, that is
canceled before the end of its test function.
Fixes#36532.
Change-Id: I9315ad4dad25529d0b5be809e2d9db4e7528b5f2
GitHub-Last-Rev: 1c3fd6c4d8a9cc68a61f2df284d04d3d080216be
GitHub-Pull-Request: golang/go#68828
Reviewed-on: https://go-review.googlesource.com/c/go/+/603959
Auto-Submit: Alan Donovan <adonovan@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
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Reviewed-by: Damien Neil <dneil@google.com>
Some tests need to use os.Chdir, but the use is complicated because
- they must change back to the old working directory;
- they must not use t.Parallel.
Add Chdir that covers these cases, and sets PWD environment variable
to the new directory for the duration of the test for Unix platforms.
Unify the panic message when t.Parallel is used together with t.Setenv
or t.Chdir.
Add some tests.
For #62516.
Change-Id: Ib050d173b26eb28a27dba5a206b2d0d877d761c1
Reviewed-on: https://go-review.googlesource.com/c/go/+/529895
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Auto-Submit: Ian Lance Taylor <iant@google.com>
For #62384
Change-Id: I1557704c6a0f9c6f3b9aad001374dd5cdbc99065
GitHub-Last-Rev: c258d18ccedab5feeb481a2431d5647bde7e5c58
GitHub-Pull-Request: golang/go#68893
Reviewed-on: https://go-review.googlesource.com/c/go/+/605758
Reviewed-by: Ian Lance Taylor <iant@google.com>
Commit-Queue: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
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Fixes#61901.
Change-Id: I4db21c91fd21079f2aa3bc81fb03dd6f40423a38
GitHub-Last-Rev: ed3df560a40ea10cdcb8ad476ba6849463f3c761
GitHub-Pull-Request: golang/go#67543
Reviewed-on: https://go-review.googlesource.com/c/go/+/587095
Auto-Submit: Ian Lance Taylor <iant@google.com>
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For #62384
Change-Id: I10df580ef966e497ff8da4efde6dd6ce1ccb17b4
GitHub-Last-Rev: 5ad8e2e0473ff509b48e525f6c7328f6281766a3
GitHub-Pull-Request: golang/go#68855
Reviewed-on: https://go-review.googlesource.com/c/go/+/605056
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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This enables JA3 and JA4 TLS fingerprinting to be implemented from
the GetCertificate callback, similar to what BoringSSL provides with
its SSL_CTX_set_dos_protection_cb hook.
fixes#32936
Change-Id: Idb54ebcb43075582fcef0ac6438727f494543424
Reviewed-on: https://go-review.googlesource.com/c/go/+/471396
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
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For #62384
Change-Id: I61529efe3a59b13606479b74af6cbff61c9efb6e
GitHub-Last-Rev: f188b91978711c55aa2daf2c72277990d25bc328
GitHub-Pull-Request: golang/go#68763
Reviewed-on: https://go-review.googlesource.com/c/go/+/603815
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These methods will not be mirrored in types2 until the
bootstrap compiler reaches go1.23; therefore range-over-func
statements must not be used in code common to types + types2.
Fixes#66626
Change-Id: I3c2c15e3652ee95d9aff208d8a188b912ed5bc9a
Reviewed-on: https://go-review.googlesource.com/c/go/+/575455
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
For #62384
Change-Id: I54707a29653df72ad9cd5633f434b87e0f630b94
GitHub-Last-Rev: 4f78947ac563d78f862c5c8de1c2e1578a8d6e08
GitHub-Pull-Request: golang/go#68620
Reviewed-on: https://go-review.googlesource.com/c/go/+/601595
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Go 1.23 adds two new events to QUICConns: QUICStoreSessionEvent and
QUICResumeSessionEvent. We added a QUICConfig.EnableStoreSessionEvent
flag to control whether the store-session event is provided or not,
because receiving this event requires additional action from the caller:
the session must be explicitly stored with QUICConn.StoreSession.
We did not add a control for whether the resume-session event is
provided, because this event requires no action and the caller is
expected to ignore unknown events.
However, we never documented the expectation that callers ignore
unknown events, and quic-go produces an error when receiving an
unexpected event. So change the EnableStoreSessionEvent flag to
apply to both new events.
Fixes#68124
For #63691
Change-Id: I84af487e52b3815f7b648e09884608f8915cd645
Reviewed-on: https://go-review.googlesource.com/c/go/+/594475
Reviewed-by: Marten Seemann <martenseemann@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
The EBADMSG, ENOTRECOVERABLE, EOWNERDEAD and EPROTO Errno are missing
on openbsd/386, openbsd/arm and openbsd/amd64. These are the earliest
OpenBSD ports and they did not exist in the system headers when the
relevant zerror_* file was generated.
These exist for all other ports, hence it makes sense to add them
for consistency. Update error and signal strings so that they are
also consistent across OpenBSD ports.
Fixes#67998
Change-Id: I948857ef5bddcfbcdfb102c95e571d9cee009e77
Reviewed-on: https://go-review.googlesource.com/c/go/+/592795
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Commit-Queue: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
This CL adds a (very opinionated) client-side ECH implementation.
In particular, if a user configures a ECHConfigList, by setting the
Config.EncryptedClientHelloConfigList, but we determine that none of
the configs are appropriate, we will not fallback to plaintext SNI, and
will instead return an error. It is then up to the user to decide if
they wish to fallback to plaintext themselves (by removing the config
list).
Additionally if Config.EncryptedClientHelloConfigList is provided, we
will not offer TLS support lower than 1.3, since negotiating any other
version, while offering ECH, is a hard error anyway. Similarly, if a
user wishes to fallback to plaintext SNI by using 1.2, they may do so
by removing the config list.
With regard to PSK GREASE, we match the boringssl behavior, which does
not include PSK identities/binders in the outer hello when doing ECH.
If the server rejects ECH, we will return a ECHRejectionError error,
which, if provided by the server, will contain a ECHConfigList in the
RetryConfigList field containing configs that should be used if the user
wishes to retry. It is up to the user to replace their existing
Config.EncryptedClientHelloConfigList with the retry config list.
Fixes#63369
Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest
Change-Id: I9bc373c044064221a647a388ac61624efd6bbdbf
Reviewed-on: https://go-review.googlesource.com/c/go/+/578575
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Auto-Submit: Roland Shoemaker <roland@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Add synchronous management of stored sessions to QUICConn.
This adds QUICStoreSession and QUICResumeSession events,
permitting a QUIC implementation to handle session resumption
as part of its regular event loop processing.
Fixes#63691
Change-Id: I9fe16207cc1986eac084869675bc36e227cbf3f0
Reviewed-on: https://go-review.googlesource.com/c/go/+/536935
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Marten Seemann <martenseemann@gmail.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
