| Age | Commit message (Collapse) | Author |
|---|
|
When either the server or client are lacking hardware support for
AES-GCM ciphers, indicated by the server lacking the relevant
instructions and by the client not putting AES-GCM ciphers at the top
of its preference list, reorder the preference list to de-prioritize
AES-GCM based ciphers when they are adjacent to other AEAD ciphers.
Also updates a number of recorded openssl TLS tests which previously
only specified TLS 1.2 cipher preferences (using -cipher), but not
TLS 1.3 cipher preferences (using -ciphersuites), to specify both
preferences, making these tests more predictable.
Fixes #41181.
Change-Id: Ied896c96c095481e755aaff9ff0746fb4cb9568e
Reviewed-on: https://go-review.googlesource.com/c/go/+/262857
Run-TryBot: Roland Shoemaker <roland@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Trust: Roland Shoemaker <roland@golang.org>
Trust: Katie Hockman <katie@golang.org>
|
|
TLS 1.3, which requires RSA-PSS, is now enabled without a GODEBUG
opt-out, and with the introduction of
Certificate.SupportedSignatureAlgorithms (#28660) there is a
programmatic way to avoid RSA-PSS (disable TLS 1.3 with MaxVersion and
use that field to specify only PKCS#1 v1.5 SignatureSchemes).
This effectively reverts 0b3a57b5374bba3fdf88258e2be4c8be65e6a5de,
although following CL 205061 all of the signing-side logic is
conveniently centralized in signatureSchemesForCertificate.
Fixes #32425
Change-Id: I7c9a8893bb5d518d86eae7db82612b9b2cd257d7
Reviewed-on: https://go-review.googlesource.com/c/go/+/205063
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
|
|
Follow the recommandation from RFC 8422, section 5.1.2 of sending back the
ec_points_format extension when requested by the client. This is to fix
some clients declining the handshake if omitted.
Fixes #31943
Change-Id: I7b04dbac6f9af75cda094073defe081e1e9a295d
Reviewed-on: https://go-review.googlesource.com/c/go/+/176418
Run-TryBot: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Olivier Poitrey <rs@rhapsodyk.net>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
|
|
Signing with RSA-PSS can uncover faulty crypto.Signer implementations,
and it can fail for (broken) small keys. We'll have to take that
breakage eventually, but it would be nice for it to be opt-out at first.
TLS 1.3 requires RSA-PSS and is opt-out in Go 1.13. Instead of making a
TLS 1.3 opt-out influence a TLS 1.2 behavior, let's wait to add RSA-PSS
to TLS 1.2 until TLS 1.3 is on without opt-out.
Note that since the Client Hello is sent before a protocol version is
selected, we have to advertise RSA-PSS there to support TLS 1.3.
That means that we still support RSA-PSS on the client in TLS 1.2 for
verifying server certificates, which is fine, as all issues arise on the
signing side. We have to be careful not to pick (or consider available)
RSA-PSS on the client for client certificates, though.
We'd expect tests to change only in TLS 1.2:
* the server won't pick PSS to sign the key exchange
(Server-TLSv12-* w/ RSA, TestHandshakeServerRSAPSS);
* the server won't advertise PSS in CertificateRequest
(Server-TLSv12-ClientAuthRequested*, TestClientAuth);
* and the client won't pick PSS for its CertificateVerify
(Client-TLSv12-ClientCert-RSA-*, TestHandshakeClientCertRSAPSS,
Client-TLSv12-Renegotiate* because "R" requests a client cert).
Client-TLSv13-ClientCert-RSA-RSAPSS was updated because of a fix in the test.
This effectively reverts 88343530720a52c96b21f2bd5488c8fb607605d7.
Testing was made more complex by the undocumented semantics of OpenSSL's
-[client_]sigalgs (see openssl/openssl#9172).
Updates #32425
Change-Id: Iaddeb2df1f5c75cd090cc8321df2ac8e8e7db349
Reviewed-on: https://go-review.googlesource.com/c/go/+/182339
Reviewed-by: Adam Langley <agl@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>
|
|
To disable TLS 1.3, simply remove VersionTLS13 from supportedVersions,
as tested by TestEscapeRoute, and amend documentation. To make it
opt-in, revert the change to (*Config).supportedVersions from this CL.
I did not have the heart to implement the early data skipping feature
when I realized that it did not offer a choice between two
abstraction-breaking options, but demanded them both (look for handshake
type in case of HelloRetryRequest, trial decryption otherwise). It's a
lot of complexity for an apparently small gain, but if anyone has strong
opinions about it let me know.
Note that in TLS 1.3 alerts are encrypted, so the close_notify peeking
to return (n > 0, io.EOF) from Read doesn't work. If we are lucky, those
servers that unexpectedly close connections after serving a single
request will have stopped (maybe thanks to H/2) before they got updated
to TLS 1.3.
Relatedly, session tickets are now provisioned on the client first Read
instead of at Handshake time, because they are, well, post-handshake
messages. If this proves to be a problem we might try to peek at them.
Doubled the tests that cover logic that's different in TLS 1.3.
The benchmarks for TLS 1.2 compared to be0f3c286b5 (before TLS 1.3 and
its refactors, after CL 142817 changed them to use real connections)
show little movement.
name old time/op new time/op delta
HandshakeServer/RSA-8 795µs ± 1% 798µs ± 1% ~ (p=0.057 n=10+18)
HandshakeServer/ECDHE-P256-RSA-8 903µs ± 0% 909µs ± 1% +0.68% (p=0.000 n=8+17)
HandshakeServer/ECDHE-P256-ECDSA-P256-8 198µs ± 0% 204µs ± 1% +3.24% (p=0.000 n=9+18)
HandshakeServer/ECDHE-X25519-ECDSA-P256-8 202µs ± 3% 208µs ± 1% +2.98% (p=0.000 n=9+20)
HandshakeServer/ECDHE-P521-ECDSA-P521-8 15.5ms ± 1% 15.9ms ± 2% +2.49% (p=0.000 n=10+20)
Throughput/MaxPacket/1MB-8 5.81ms ±23% 6.14ms ±44% ~ (p=0.605 n=8+18)
Throughput/MaxPacket/2MB-8 8.91ms ±22% 8.74ms ±33% ~ (p=0.498 n=9+19)
Throughput/MaxPacket/4MB-8 12.8ms ± 3% 14.0ms ±10% +9.74% (p=0.000 n=10+17)
Throughput/MaxPacket/8MB-8 25.1ms ± 7% 24.6ms ±16% ~ (p=0.129 n=9+19)
Throughput/MaxPacket/16MB-8 46.3ms ± 4% 45.9ms ±12% ~ (p=0.340 n=9+20)
Throughput/MaxPacket/32MB-8 88.5ms ± 4% 86.0ms ± 4% -2.82% (p=0.004 n=10+20)
Throughput/MaxPacket/64MB-8 173ms ± 2% 167ms ± 7% -3.42% (p=0.001 n=10+19)
Throughput/DynamicPacket/1MB-8 5.88ms ± 4% 6.59ms ±64% ~ (p=0.232 n=9+18)
Throughput/DynamicPacket/2MB-8 9.08ms ±12% 8.73ms ±21% ~ (p=0.408 n=10+18)
Throughput/DynamicPacket/4MB-8 14.2ms ± 5% 14.0ms ±11% ~ (p=0.188 n=9+19)
Throughput/DynamicPacket/8MB-8 25.1ms ± 6% 24.0ms ± 7% -4.39% (p=0.000 n=10+18)
Throughput/DynamicPacket/16MB-8 45.6ms ± 3% 43.3ms ± 1% -5.22% (p=0.000 n=10+8)
Throughput/DynamicPacket/32MB-8 88.4ms ± 3% 84.8ms ± 2% -4.06% (p=0.000 n=10+10)
Throughput/DynamicPacket/64MB-8 175ms ± 3% 167ms ± 2% -4.63% (p=0.000 n=10+10)
Latency/MaxPacket/200kbps-8 694ms ± 0% 694ms ± 0% -0.02% (p=0.000 n=9+9)
Latency/MaxPacket/500kbps-8 279ms ± 0% 279ms ± 0% -0.09% (p=0.000 n=10+10)
Latency/MaxPacket/1000kbps-8 140ms ± 0% 140ms ± 0% -0.15% (p=0.000 n=10+9)
Latency/MaxPacket/2000kbps-8 71.1ms ± 0% 71.0ms ± 0% -0.09% (p=0.001 n=8+9)
Latency/MaxPacket/5000kbps-8 30.5ms ± 6% 30.1ms ± 6% ~ (p=0.905 n=10+9)
Latency/DynamicPacket/200kbps-8 134ms ± 0% 134ms ± 0% ~ (p=0.796 n=9+9)
Latency/DynamicPacket/500kbps-8 54.8ms ± 0% 54.7ms ± 0% -0.18% (p=0.000 n=8+10)
Latency/DynamicPacket/1000kbps-8 28.5ms ± 0% 29.1ms ± 8% ~ (p=0.173 n=8+10)
Latency/DynamicPacket/2000kbps-8 15.3ms ± 6% 15.9ms ±10% ~ (p=0.905 n=9+10)
Latency/DynamicPacket/5000kbps-8 9.14ms ±21% 9.65ms ±82% ~ (p=0.529 n=10+10)
name old speed new speed delta
Throughput/MaxPacket/1MB-8 175MB/s ±13% 167MB/s ±64% ~ (p=0.646 n=7+20)
Throughput/MaxPacket/2MB-8 241MB/s ±25% 241MB/s ±40% ~ (p=0.660 n=9+20)
Throughput/MaxPacket/4MB-8 328MB/s ± 3% 300MB/s ± 9% -8.70% (p=0.000 n=10+17)
Throughput/MaxPacket/8MB-8 335MB/s ± 7% 340MB/s ±17% ~ (p=0.212 n=9+20)
Throughput/MaxPacket/16MB-8 363MB/s ± 4% 367MB/s ±11% ~ (p=0.340 n=9+20)
Throughput/MaxPacket/32MB-8 379MB/s ± 4% 390MB/s ± 4% +2.93% (p=0.004 n=10+20)
Throughput/MaxPacket/64MB-8 388MB/s ± 2% 401MB/s ± 7% +3.25% (p=0.004 n=10+20)
Throughput/DynamicPacket/1MB-8 178MB/s ± 4% 157MB/s ±73% ~ (p=0.127 n=9+20)
Throughput/DynamicPacket/2MB-8 232MB/s ±11% 243MB/s ±18% ~ (p=0.415 n=10+18)
Throughput/DynamicPacket/4MB-8 296MB/s ± 5% 299MB/s ±15% ~ (p=0.295 n=9+20)
Throughput/DynamicPacket/8MB-8 334MB/s ± 6% 350MB/s ± 7% +4.58% (p=0.000 n=10+18)
Throughput/DynamicPacket/16MB-8 368MB/s ± 3% 388MB/s ± 1% +5.48% (p=0.000 n=10+8)
Throughput/DynamicPacket/32MB-8 380MB/s ± 3% 396MB/s ± 2% +4.20% (p=0.000 n=10+10)
Throughput/DynamicPacket/64MB-8 384MB/s ± 3% 403MB/s ± 2% +4.83% (p=0.000 n=10+10)
Comparing TLS 1.2 and TLS 1.3 at tip shows a slight (~5-10%) slowdown of
handshakes, which might be worth looking at next cycle, but the latency
improvements are expected to overshadow that.
name old time/op new time/op delta
HandshakeServer/ECDHE-P256-RSA-8 909µs ± 1% 963µs ± 0% +5.87% (p=0.000 n=17+18)
HandshakeServer/ECDHE-P256-ECDSA-P256-8 204µs ± 1% 225µs ± 2% +10.20% (p=0.000 n=18+20)
HandshakeServer/ECDHE-X25519-ECDSA-P256-8 208µs ± 1% 230µs ± 2% +10.35% (p=0.000 n=20+18)
HandshakeServer/ECDHE-P521-ECDSA-P521-8 15.9ms ± 2% 15.9ms ± 1% ~ (p=0.444 n=20+19)
Throughput/MaxPacket/1MB-8 6.14ms ±44% 7.07ms ±46% ~ (p=0.057 n=18+19)
Throughput/MaxPacket/2MB-8 8.74ms ±33% 8.61ms ± 9% ~ (p=0.552 n=19+17)
Throughput/MaxPacket/4MB-8 14.0ms ±10% 14.1ms ±12% ~ (p=0.707 n=17+20)
Throughput/MaxPacket/8MB-8 24.6ms ±16% 25.6ms ±14% ~ (p=0.107 n=19+20)
Throughput/MaxPacket/16MB-8 45.9ms ±12% 44.7ms ± 6% ~ (p=0.607 n=20+19)
Throughput/MaxPacket/32MB-8 86.0ms ± 4% 87.9ms ± 8% ~ (p=0.113 n=20+19)
Throughput/MaxPacket/64MB-8 167ms ± 7% 169ms ± 2% +1.26% (p=0.011 n=19+19)
Throughput/DynamicPacket/1MB-8 6.59ms ±64% 6.79ms ±43% ~ (p=0.480 n=18+19)
Throughput/DynamicPacket/2MB-8 8.73ms ±21% 9.58ms ±13% +9.71% (p=0.006 n=18+20)
Throughput/DynamicPacket/4MB-8 14.0ms ±11% 13.9ms ±10% ~ (p=0.687 n=19+20)
Throughput/DynamicPacket/8MB-8 24.0ms ± 7% 24.6ms ± 8% +2.36% (p=0.045 n=18+17)
Throughput/DynamicPacket/16MB-8 43.3ms ± 1% 44.3ms ± 2% +2.48% (p=0.001 n=8+9)
Throughput/DynamicPacket/32MB-8 84.8ms ± 2% 86.7ms ± 2% +2.27% (p=0.000 n=10+10)
Throughput/DynamicPacket/64MB-8 167ms ± 2% 170ms ± 3% +1.89% (p=0.005 n=10+10)
Latency/MaxPacket/200kbps-8 694ms ± 0% 699ms ± 0% +0.65% (p=0.000 n=9+10)
Latency/MaxPacket/500kbps-8 279ms ± 0% 280ms ± 0% +0.68% (p=0.000 n=10+10)
Latency/MaxPacket/1000kbps-8 140ms ± 0% 141ms ± 0% +0.59% (p=0.000 n=9+9)
Latency/MaxPacket/2000kbps-8 71.0ms ± 0% 71.3ms ± 0% +0.42% (p=0.000 n=9+9)
Latency/MaxPacket/5000kbps-8 30.1ms ± 6% 30.7ms ±10% +1.93% (p=0.019 n=9+9)
Latency/DynamicPacket/200kbps-8 134ms ± 0% 138ms ± 0% +3.22% (p=0.000 n=9+10)
Latency/DynamicPacket/500kbps-8 54.7ms ± 0% 56.3ms ± 0% +3.03% (p=0.000 n=10+8)
Latency/DynamicPacket/1000kbps-8 29.1ms ± 8% 29.1ms ± 0% ~ (p=0.173 n=10+8)
Latency/DynamicPacket/2000kbps-8 15.9ms ±10% 16.4ms ±36% ~ (p=0.633 n=10+8)
Latency/DynamicPacket/5000kbps-8 9.65ms ±82% 8.32ms ± 8% ~ (p=0.573 n=10+8)
name old speed new speed delta
Throughput/MaxPacket/1MB-8 167MB/s ±64% 155MB/s ±55% ~ (p=0.224 n=20+19)
Throughput/MaxPacket/2MB-8 241MB/s ±40% 244MB/s ± 9% ~ (p=0.407 n=20+17)
Throughput/MaxPacket/4MB-8 300MB/s ± 9% 298MB/s ±11% ~ (p=0.707 n=17+20)
Throughput/MaxPacket/8MB-8 340MB/s ±17% 330MB/s ±13% ~ (p=0.201 n=20+20)
Throughput/MaxPacket/16MB-8 367MB/s ±11% 375MB/s ± 5% ~ (p=0.607 n=20+19)
Throughput/MaxPacket/32MB-8 390MB/s ± 4% 382MB/s ± 8% ~ (p=0.113 n=20+19)
Throughput/MaxPacket/64MB-8 401MB/s ± 7% 397MB/s ± 2% -0.96% (p=0.030 n=20+19)
Throughput/DynamicPacket/1MB-8 157MB/s ±73% 156MB/s ±39% ~ (p=0.738 n=20+20)
Throughput/DynamicPacket/2MB-8 243MB/s ±18% 220MB/s ±14% -9.65% (p=0.006 n=18+20)
Throughput/DynamicPacket/4MB-8 299MB/s ±15% 303MB/s ± 9% ~ (p=0.512 n=20+20)
Throughput/DynamicPacket/8MB-8 350MB/s ± 7% 342MB/s ± 8% -2.27% (p=0.045 n=18+17)
Throughput/DynamicPacket/16MB-8 388MB/s ± 1% 378MB/s ± 2% -2.41% (p=0.001 n=8+9)
Throughput/DynamicPacket/32MB-8 396MB/s ± 2% 387MB/s ± 2% -2.21% (p=0.000 n=10+10)
Throughput/DynamicPacket/64MB-8 403MB/s ± 2% 396MB/s ± 3% -1.84% (p=0.005 n=10+10)
Fixes #9671
Change-Id: Ieb57c5140eb2c083b8be0d42b240cd2eeec0dcf6
Reviewed-on: https://go-review.googlesource.com/c/147638
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
|
|
crypto/x509 already supports PSS signatures (with rsaEncryption OID),
and crypto/tls support was added in CL 79736. Advertise support for the
algorithms and accept them as a peer.
Note that this is about PSS signatures from regular RSA public keys.
RSA-PSS only public keys (with RSASSA-PSS OID) are supported in neither
crypto/tls nor crypto/x509. See RFC 8446, Section 4.2.3.
testdata/Server-TLSv12-ClientAuthRequested* got modified because the
CertificateRequest carries the supported signature algorithms.
The net/smtp tests changed because 512 bits keys are too small for PSS.
Based on Peter Wu's CL 79738, who did all the actual work in CL 79736.
Updates #9671
Change-Id: I4a31e9c6e152ff4c50a5c8a274edd610d5fff231
Reviewed-on: https://go-review.googlesource.com/c/146258
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
|
|
This is the equivalent change to 1c105980 but for SHA-512.
SHA-512 certificates are already supported by default since b53bb2ca,
but some servers will refuse connections if the algorithm is not
advertised in the overloaded signatureAndHash extension (see 09b238f1).
This required adding support for SHA-512 signatures on CertificateVerify
and ServerKeyExchange messages, because of said overloading.
Some testdata/Client-TLSv1{0,1} files changed because they send a 1.2
ClientHello even if the server picks a lower version.
Closes #22422
Change-Id: I16282d03a3040260d203711ec21e6b20a0e1e105
Reviewed-on: https://go-review.googlesource.com/74950
Run-TryBot: Filippo Valsorda <hi@filippo.io>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
|
|
This change enables the ChaCha20-Poly1305 cipher suites by default. This
changes the default ClientHello and thus requires updating all the
tests.
Change-Id: I6683a2647caaff4a11f9e932babb6f07912cad94
Reviewed-on: https://go-review.googlesource.com/30958
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
|
|
Since this changes the offered curves in the ClientHello, all the test
data needs to be updated too.
Change-Id: I227934711104349c0f0eab11d854e5a2adcbc363
Reviewed-on: https://go-review.googlesource.com/30825
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
|
|
We will need OpenSSL 1.1.0 in order to test some of the features
expected for Go 1.8. However, 1.1.0 also disables (by default) some
things that we still want to test, such as RC4, 3DES and SSLv3. Thus
developers wanting to update the crypto/tls test data will need to build
OpenSSL from source.
This change updates the test data with transcripts generated by 1.1.0
(in order to reduce future diffs) and also causes a banner to be printed
if 1.1.0 is not used when updating.
(The test for an ALPN mismatch is removed because OpenSSL now terminates
the connection with a fatal alert if no known ALPN protocols are
offered. There's no point testing against this because it's an OpenSSL
behaviour.)
Change-Id: I957516975e0b8c7def84184f65c81d0b68f1c551
Reviewed-on: https://go-review.googlesource.com/30821
Run-TryBot: Adam Langley <agl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
|
|
The RFC is clear that the Parameters in an AlgorithmIdentifer for an RSA
public key must be NULL. BoringSSL enforces this so we have strong
evidence that this is a widely compatible change.
Embarrassingly enough, the major source of violations of this is us. Go
used to get this correct in only one of two places. This was only fixed
in 2013 (with 4874bc9b). That's why lots of test certificates are
updated in this change.
Fixes #16166.
Change-Id: Ib9a4551349354c66e730d44eb8cee4ec402ea8ab
Reviewed-on: https://go-review.googlesource.com/27312
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
|
|
TLS_RSA_WITH_AES_256_GCM_SHA384 cipher suites
Fixes #9894.
Change-Id: I9c7ce771df2e2d1c99a06f800dce63c4e1875993
Reviewed-on: https://go-review.googlesource.com/16924
Run-TryBot: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
|
|
This change alters the certificate used in many tests so that it's no
longer self-signed. This allows some tests to exercise the standard
certificate verification paths in the future.
Change-Id: I9c3fcd6847eed8269ff3b86d9b6966406bf0642d
Reviewed-on: https://go-review.googlesource.com/13244
Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: Adam Langley <agl@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
|
|
This is the second in a two-part change. See https://golang.org/cl/9415
for details of the overall change.
This change updates the supported signature algorithms to include
SHA-384 and updates all the testdata/ files accordingly. Even some of
the testdata/ files named “TLS1.0” and “TLS1.1” have been updated
because they have TLS 1.2 ClientHello's even though the server picks a
lower version.
Fixes #9757.
Change-Id: Ia76de2b548d3b39cd4aa3f71132b0da7c917debd
Reviewed-on: https://go-review.googlesource.com/9472
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
|
|
Prior to TLS 1.2, the handshake had a pleasing property that one could
incrementally hash it and, from that, get the needed hashes for both
the CertificateVerify and Finished messages.
TLS 1.2 introduced negotiation for the signature and hash and it became
possible for the handshake hash to be, say, SHA-384, but for the
CertificateVerify to sign the handshake with SHA-1. The problem is that
one doesn't know in advance which hashes will be needed and thus the
handshake needs to be buffered.
Go ignored this, always kept a single handshake hash, and any signatures
over the handshake had to use that hash.
However, there are a set of servers that inspect the client's offered
signature hash functions and will abort the handshake if one of the
server's certificates is signed with a hash function outside of that
set. https://robertsspaceindustries.com/ is an example of such a server.
Clearly not a lot of thought happened when that server code was written,
but its out there and we have to deal with it.
This change decouples the handshake hash from the CertificateVerify
hash. This lays the groundwork for advertising support for SHA-384 but
doesn't actually make that change in the interests of reviewability.
Updating the advertised hash functions will cause changes in many of the
testdata/ files and some errors might get lost in the noise. This change
only needs to update four testdata/ files: one because a SHA-384-based
handshake is now being signed with SHA-256 and the others because the
TLS 1.2 CertificateRequest message now includes SHA-1.
This change also has the effect of adding support for
client-certificates in SSLv3 servers. However, SSLv3 is now disabled by
default so this should be moot.
It would be possible to avoid much of this change and just support
SHA-384 for the ServerKeyExchange as the SKX only signs over the nonces
and SKX params (a design mistake in TLS). However, that would leave Go
in the odd situation where it advertised support for SHA-384, but would
only use the handshake hash when signing client certificates. I fear
that'll just cause problems in the future.
Much of this code was written by davidben@ for the purposes of testing
BoringSSL.
Partly addresses #9757
Change-Id: I5137a472b6076812af387a5a69fc62c7373cd485
Reviewed-on: https://go-review.googlesource.com/9415
Run-TryBot: Adam Langley <agl@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
|
|
Preparation was in CL 134570043.
This CL contains only the effect of 'hg mv src/pkg/* src'.
For more about the move, see golang.org/s/go14nopkg.
|
