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Anit Gandhi 62a994837a crypto/tls: improve client auth failure alerts 
This change makes it easier for clients to debug mutual TLS connection failures. Currently, there are a few situations where invalid client auth leads to a generic "bad certificate" alert. 3 specific situations have a more appropriate TLS alert code, based on the alert descriptions in the appendix of both RFC5246 and RFC8446.
  1. The server is configured to require client auth, but no client cert was provided; the appropriate alert is "certificate required". This applies only to TLS 1.3, which first defined the certificate_required alert code.
  2. The client provided a cert that was signed by an authority that is not in the server's trusted set of CAs; the appropriate alert is "unknown certificate authority".
  3. The client provided an expired (or not yet valid) cert; the appropriate alert is "expired certificate".
Otherwise, we still fall back to "bad certificate".

Fixes #52113

Change-Id: I7d5860fe911cad8a1615f16bfe488a37e936dc36
GitHub-Last-Rev: 34eeab587b
GitHub-Pull-Request: golang/go#53251
Reviewed-on: https://go-review.googlesource.com/c/go/+/410496
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Run-TryBot: Roland Shoemaker <roland@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Roland Shoemaker <roland@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
2023-01-20 16:19:42 +00:00
.github .github: suggest using private browsing in pkgsite template 2023-01-03 18:52:47 +00:00
api runtime: replace panic(nil) with panic(new(runtime.PanicNilError)) 2023-01-19 22:21:50 +00:00
doc runtime: replace panic(nil) with panic(new(runtime.PanicNilError)) 2023-01-19 22:21:50 +00:00
lib/time time/tzdata: generate zip constant during cmd/dist 2023-01-17 22:30:53 +00:00
misc all: fix typos in go file comments 2023-01-20 03:27:26 +00:00
src crypto/tls: improve client auth failure alerts 2023-01-20 16:19:42 +00:00
test cmd/compile: AMD64v3 remove unnecessary TEST comparision in isPowerOfTwo 2023-01-20 04:58:59 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore time/tzdata: generate zip constant during cmd/dist 2023-01-17 22:30:53 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md
go.env cmd/go: introduce GOROOT/go.env and move proxy/sumdb config there 2023-01-17 23:10:39 +00:00
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README.md README: update from CC-BY-3.0 to CC-BY-4.0 2022-11-02 20:14:56 +00:00
SECURITY.md SECURITY.md: replace golang.org with go.dev 2022-04-26 19:59:47 +00:00

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