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Message marshalling makes use of BytesOrPanic a lot, under the
assumption that it will never panic. This assumption was incorrect, and
specifically crafted handshakes could trigger panics. Rather than just
surgically replacing the usages of BytesOrPanic in paths that could
panic, replace all usages of it with proper error returns in case there
are other ways of triggering panics which we didn't find.
In one specific case, the tree routed by expandLabel, we replace the
usage of BytesOrPanic, but retain a panic. This function already
explicitly panicked elsewhere, and returning an error from it becomes
rather painful because it requires changing a large number of APIs.
The marshalling is unlikely to ever panic, as the inputs are all either
fixed length, or already limited to the sizes required. If it were to
panic, it'd likely only be during development. A close inspection shows
no paths for a user to cause a panic currently.
This patches ends up being rather large, since it requires routing
errors back through functions which previously had no error returns.
Where possible I've tried to use helpers that reduce the verbosity
of frequently repeated stanzas, and to make the diffs as minimal as
possible.
Thanks to Marten Seemann for reporting this issue.
Fixes #58001
Fixes CVE-2022-41724
Change-Id: Ieb55867ef0a3e1e867b33f09421932510cb58851
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1679436
Reviewed-by: Julie Qiu <julieqiu@google.com>
TryBot-Result: Security TryBots <security-trybots@go-security-trybots.iam.gserviceaccount.com>
Run-TryBot: Roland Shoemaker <bracewell@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/468125
Run-TryBot: Michael Pratt <mpratt@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Michael Pratt <mpratt@google.com>
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Change-Id: I06f85f78c4c802142fc9207b100753decd568274
GitHub-Last-Rev: 4ad4c0f5e93df9ea83deb86b814167e661bba0ff
GitHub-Pull-Request: golang/go#55945
Reviewed-on: https://go-review.googlesource.com/c/go/+/436639
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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We use crypto/internal/edwards25519/field to implement X25519 directly,
so that golang.org/x/crypto/curve25519 can be dropped from the src
module dependencies, and eventually replaced with a crypto/ecdh wrapper,
removing the need to keep golang.org/x/crypto/curve25519/internal/field
in sync with crypto/internal/edwards25519/field.
In crypto/internal/nistec, we add BytesX to serialize only the x
coordinate, which we'll need for the horrible ECDSA x-coord-to-scalar
operation, too.
In crypto/tls, we replace the ECDHE implementation with crypto/ecdh,
dropping the X25519 special cases and related scaffolding.
Finally, FINALLY, we deprecate the ~white whale~ big.Int-based APIs of
the crypto/elliptic package. •_•) ( •_•)>⌐■-■ (⌐■_■)
Fixes #52182
Fixes #34648
Fixes #52221
Change-Id: Iccdda210319cc892e96bb28a0e7b7123551982c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/398914
Reviewed-by: Fernando Lobato Meeser <felobato@google.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
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Replaced almost every use of Bytes with FillBytes.
Note that the approved proposal was for
func (*Int) FillBytes(buf []byte)
while this implements
func (*Int) FillBytes(buf []byte) []byte
because the latter was far nicer to use in all callsites.
Fixes #35833
Change-Id: Ia912df123e5d79b763845312ea3d9a8051343c0a
Reviewed-on: https://go-review.googlesource.com/c/go/+/230397
Reviewed-by: Robert Griesemer <gri@golang.org>
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Change-Id: Icd5006e37861d892a5f3d4397c3826179c1b12ad
Reviewed-on: https://go-review.googlesource.com/c/go/+/206657
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
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The RFC recommends checking the X25519 output to ensure it's not the
zero value, to guard against peers trying to remove contributory
behavior.
In TLS there should be enough transcript involvement to mitigate any
attack, and the RSA key exchange would suffer from the same issues by
design, so not proposing a backport.
See #31846
Change-Id: I8e657f8ee8aa72c3f8ca3b124555202638c53f5e
Reviewed-on: https://go-review.googlesource.com/c/go/+/183039
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
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This also updates the vendored-in versions of several packages: 'go
mod vendor' selects a consistent version of each module, but we had
previously vendored an ad-hoc selection of packages.
Notably, x/crypto/hkdf was previously vendored in at a much newer
commit than the rest of x/crypto. Bringing the rest of x/crypto up to
that commit introduced an import of golang.org/x/sys/cpu, which broke
the js/wasm build, requiring an upgrade of x/sys to pick up CL 165749.
Updates #30228
Updates #30241
Updates #25822
Change-Id: I5b3dbc232b7e6a048a158cbd8d36137af1efb711
Reviewed-on: https://go-review.googlesource.com/c/go/+/164623
Reviewed-by: Filippo Valsorda <filippo@golang.org>
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Packages in vendor/ directories have a "vendor/" path prefix in GOPATH
mode, but intentionally do not in module mode. Since the import path
is embedded in the compiled output, changing that path invalidates
cache entries and causes cmd/go to try to rebuild (and reinstall) the
vendored libraries, which will fail if the directory containing those
libraries is read-only.
If I understood correctly, this is the approach Russ suggested as an
alternative to https://golang.org/cl/136138.
Fixes #27285
Fixes #26988
Change-Id: I8a2507fa892b84cde0a803aaa79e460723da572b
Reviewed-on: https://go-review.googlesource.com/c/147443
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
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Also check original certificate validity when resuming TLS 1.0–1.2. Will
refuse to resume a session if the certificate is expired or if the
original connection had InsecureSkipVerify and the resumed one doesn't.
Support only PSK+DHE to protect forward secrecy even with lack of a
strong session ticket rotation story.
Tested with NSS because s_server does not provide any way of getting the
same session ticket key across invocations. Will self-test like TLS
1.0–1.2 once server side is implemented.
Incorporates CL 128477 by @santoshankr.
Fixes #24919
Updates #9671
Change-Id: Id3eaa5b6c77544a1357668bf9ff255f3420ecc34
Reviewed-on: https://go-review.googlesource.com/c/147420
Reviewed-by: Adam Langley <agl@golang.org>
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Implement a basic TLS 1.3 client handshake, only enabled if explicitly
requested with MaxVersion.
This CL intentionally leaves for future CLs:
- PSK modes and resumption
- client authentication
- post-handshake messages
- downgrade protection
- KeyLogWriter support
Updates #9671
Change-Id: Ieb6130fb6f25aea4f0d39e3a2448dfc942e1de7a
Reviewed-on: https://go-review.googlesource.com/c/146559
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
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Vendors golang.org/x/crypto/hkdf at e84da0312774c21d64ee2317962ef669b27ffb41
Updates #9671
Change-Id: I2610c4a66756e2a6f21f9823dcbe39edd9c9ea21
Reviewed-on: https://go-review.googlesource.com/c/145298
Reviewed-by: Adam Langley <agl@golang.org>
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