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Filippo Valsorda 4f9ec2c756 crypto/x509: ignore Common Name when it does not parse as a hostname
The Common Name is used as a hostname when there are no Subject
Alternative Names, but it is not restricted by name constraints. To
protect against a name constraints bypass, we used to require SANs for
constrained chains. See the NameConstraintsWithoutSANs error.

This change ignores the CN when it does not look like a hostname, so we
can avoid returning NameConstraintsWithoutSANs.

This makes it possible to validate certificates with non-hostname CN
against chains that use name constraints to disallow all names, like the
Estonian IDs.

Updates #24151

Change-Id: I798d797990720a01ad9b5a13336756cc472ebf44
Reviewed-on: https://go-review.googlesource.com/123355
Reviewed-by: Adam Langley <agl@golang.org>
2018-07-16 19:30:08 +00:00
.github .github: use HTTPS for Stack Overflow link in SUPPORT.md 2018-06-12 11:08:14 +00:00
api syscall: convert Windows AddrinfoW.Addr from uintptr to syscall.Pointer 2018-07-12 15:36:15 +00:00
doc doc: move the go1.11 "all" section elsewhere, add os/signal.Ignored, GOMIPS64 2018-07-16 18:38:30 +00:00
lib/time lib/time: update vendored tzdata to release 2018e 2018-06-11 14:47:06 +00:00
misc misc/cgo: fix darwin test, again 2018-07-16 19:14:30 +00:00
src crypto/x509: ignore Common Name when it does not parse as a hostname 2018-07-16 19:30:08 +00:00
test cmd/compile: handle degenerate write barrier case 2018-07-12 19:06:09 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: add additional email address 2018-07-06 02:04:28 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS CONTRIBUTORS: replace old e-mail address 2018-07-06 09:33:50 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
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README.md README: linkify some paths 2018-06-06 18:07:01 +00:00
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