[release-branch.go1.11] crypto/x509: consider parents by Subject if AKID has no match
If a certificate somehow has an AKID, it should still chain successfully
to a parent without a SKID, even if the latter is invalid according to
RFC 5280, because only the Subject is authoritative.
This reverts to the behavior before #29233 was fixed in
770130659. Roots
with the right subject will still be shadowed by roots with the right
SKID and the wrong subject, but that's been the case for a long time, and
is left for a more complete fix in Go 1.13.
Updates #30079
Fixes #30081
Change-Id: If8ab0179aca86cb74caa926d1ef93fb5e416b4bb
Reviewed-on: https://go-review.googlesource.com/c/161097
Reviewed-by: Adam Langley <agl@golang.org>
(cherry picked from commit
95e5b07cf5fdf3352f04f5557df38f22c55ce8e8)
Reviewed-on: https://go-review.googlesource.com/c/163739
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>