Public bug reported:

Seen on 18.04.1 with openssl/libssl 1.1.0g-2ubuntu4.1

As per the issue on the openssl github at
https://github.com/openssl/openssl/issues/5521 - 1.1.0 is overzealous
about parsing common names as hostnames and this can lead to incorrectly
rejecting client certificates from CAs with DNS name constraints. This
is reportedly fixed in 1.1.1.

Specifically this is an issue in my case because I run an apache2 server
that verifies client certificates on https connections and have
discovered that some certificates are being rejected because an
intermediate CA has DNS name constraints which are being unexpectedly
applied to the CN of client certificates.

** Affects: openssl (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bionic

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https://bugs.launchpad.net/bugs/1802125

Title:
  openssl 1.1.0 incorrectly verifies certificates with permitted name
  constraints

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