Also, add Version to CertificateRequestInfo, as the semantics of
SignatureSchemes change based on version: the ECDSA SignatureSchemes are
only constrained to a specific curve in TLS 1.3.
Fixes#32426
Change-Id: I7a551bea864799e98118349ac2476162893d1ffd
Reviewed-on: https://go-review.googlesource.com/c/go/+/205058
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
This refactors a lot of the certificate support logic to make it cleaner
and reusable where possible. These changes will make the following CLs
much simpler.
In particular, the heavily overloaded pickSignatureAlgorithm is gone.
That function used to cover both signing and verifying side, would work
both for pre-signature_algorithms TLS 1.0/1.1 and TLS 1.2, and returned
sigalg, type and hash.
Now, TLS 1.0/1.1 and 1.2 are differentiated at the caller, as they have
effectively completely different logic. TLS 1.0/1.1 simply use
legacyTypeAndHashFromPublicKey as they employ a fixed hash function and
signature algorithm for each public key type. TLS 1.2 is instead routed
through selectSignatureScheme (on the signing side) or
isSupportedSignatureAlgorithm (on the verifying side) and
typeAndHashFromSignatureScheme, like TLS 1.3.
On the signing side, signatureSchemesForCertificate was already version
aware (for PKCS#1 v1.5 vs PSS support), so selectSignatureScheme just
had to learn the Section 7.4.1.4.1 defaults for a missing
signature_algorithms to replace pickSignatureAlgorithm.
On the verifying side, pickSignatureAlgorithm was also checking the
public key type, while isSupportedSignatureAlgorithm +
typeAndHashFromSignatureScheme are not, but that check was redundant
with the one in verifyHandshakeSignature.
There should be no major change in behavior so far. A few minor changes
came from the refactor: we now correctly require signature_algorithms in
TLS 1.3 when using a certificate; we won't use Ed25519 in TLS 1.2 if the
client didn't send signature_algorithms; and we don't send
ec_points_format in the ServerHello (a compatibility measure) if we are
not doing ECDHE anyway because there are no mutually supported curves.
The tests also got simpler because they test simpler functions. The
caller logic switching between TLS 1.0/1.1 and 1.2 is tested by the
transcript tests.
Updates #32426
Change-Id: Ice9dcaea78d204718f661f8d60efdb408ba41577
Reviewed-on: https://go-review.googlesource.com/c/go/+/205061
Reviewed-by: Katie Hockman <katie@golang.org>
Also, fix the alert value sent when a signature by a client certificate
is invalid in TLS 1.0-1.2.
Fixes#35190
Change-Id: I2ae1d5593dfd5ee2b4d979664aec74aab4a8a704
Reviewed-on: https://go-review.googlesource.com/c/go/+/204157
Reviewed-by: Katie Hockman <katie@golang.org>
Support for Ed25519 certificates was added in CL 175478, this wires them
up into the TLS stack according to RFC 8422 (TLS 1.2) and RFC 8446 (TLS 1.3).
RFC 8422 also specifies support for TLS 1.0 and 1.1, and I initially
implemented that, but even OpenSSL doesn't take the complexity, so I
just dropped it. It would have required keeping a buffer of the
handshake transcript in order to do the direct Ed25519 signatures. We
effectively need to support TLS 1.2 because it shares ClientHello
signature algorithms with TLS 1.3.
While at it, reordered the advertised signature algorithms in the rough
order we would want to use them, also based on what curves have fast
constant-time implementations.
Client and client auth tests changed because of the change in advertised
signature algorithms in ClientHello and CertificateRequest.
Fixes#25355
Change-Id: I9fdd839afde4fd6b13fcbc5cc7017fd8c35085ee
Reviewed-on: https://go-review.googlesource.com/c/go/+/177698
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
signatureSchemesForCertificate was written to be used with TLS 1.3, but
ended up used for TLS 1.2 client certificates in a refactor. Since it
only supported TLS 1.3 signature algorithms, it would lead to no RSA
client certificates being sent to servers that didn't support RSA-PSS.
TestHandshakeClientCertRSAPKCS1v15 was testing *specifically* for this,
but alas the OpenSSL flag -verify accepts an empty certificates list as
valid, as opposed to -Verify...
Fixes#28925
Change-Id: I61afc02ca501d3d64ab4ad77bbb4cf10931e6f93
Reviewed-on: https://go-review.googlesource.com/c/151660
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
Note that the SignatureSchemes passed to GetClientCertificate in TLS 1.2
are now filtered by the requested certificate type. This feels like an
improvement anyway, and the full list can be surfaced as well when
support for signature_algorithms_cert is added, which actually matches
the semantics of the CertificateRequest signature_algorithms in TLS 1.2.
Also, note a subtle behavior change in server side resumption: if a
certificate is requested but not required, and the resumed session did
not include one, it used not to invoke VerifyPeerCertificate. However,
if the resumed session did include a certificate, it would. (If a
certificate was required but not in the session, the session is rejected
in checkForResumption.) This inconsistency could be unexpected, even
dangerous, so now VerifyPeerCertificate is always invoked. Still not
consistent with the client behavior, which does not ever invoke
VerifyPeerCertificate on resumption, but it felt too surprising to
entirely change either.
Updates #9671
Change-Id: Ib2b0dbc30e659208dca3ac07d6c687a407d7aaaf
Reviewed-on: https://go-review.googlesource.com/c/147599
Reviewed-by: Adam Langley <agl@golang.org>
Added some assertions to testHandshake, but avoided checking the error
of one of the Close() because the one that would lose the race would
write the closeNotify to a connection closed on the other side which is
broken on js/wasm (#28650). Moved that Close() after the chan sync to
ensure it happens second.
Accepting a ticket with client certificates when NoClientCert is
configured is probably not a problem, and we could hide them to avoid
confusing the application, but the current behavior is to skip the
ticket, and I'd rather keep behavior changes to a minimum.
Updates #9671
Change-Id: I93b56e44ddfe3d48c2bef52c83285ba2f46f297a
Reviewed-on: https://go-review.googlesource.com/c/147445
Reviewed-by: Adam Langley <agl@golang.org>
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>
Looks like the introduction of CCS records in the client second flight
gave time to s_server to send NewSessionTicket messages in between the
client application data and close_notify. There seems to be no way of
turning NewSessionTicket messages off, neither by not sending a
psk_key_exchange_modes extension, nor by command line flag.
Interleaving the client write like that tickled an issue akin to #18701:
on Windows, the client reaches Close() before the last record is drained
from the send buffer, the kernel notices and resets the connection,
cutting short the last flow. There is no good way of synchronizing this,
so we sleep for a RTT before calling close, like in CL 75210. Sigh.
Updates #9671
Change-Id: I44dc1cca17b373695b5a18c2741f218af2990bd1
Reviewed-on: https://go-review.googlesource.com/c/147419
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
Also, add support for the SSLKEYLOGFILE environment variable to the
tests, to simplify debugging of unexpected failures.
Updates #9671
Change-Id: I20a34a5824f083da93097b793d51e796d6eb302b
Reviewed-on: https://go-review.googlesource.com/c/147417
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
