[Bug 1576799] Re: Regression: 2:4.3.8+dfsg-0ubuntu0.14.04.2 Failed to Issue the StartTLS instruction

[Andreas Hasenack]

Xenial samba packages with the mentioned change reversed are currently
building in this PPA:

https://launchpad.net/~ahasenack/+archive/ubuntu/samba-tls-
regression-1576799

Once it's done, and if you are willing to test it, you can add the ppa
to your system following the instructions from that page and
install/upgrade the packages.

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https://bugs.launchpad.net/bugs/1576799

Title:
  Regression: 2:4.3.8+dfsg-0ubuntu0.14.04.2 Failed to Issue the StartTLS
  instruction

Status in samba package in Ubuntu:
  Confirmed

Bug description:
  With the recent samba upgrade to 2:4.3.8+dfsg-0ubuntu0.14.04.2, we
  were seeing regression with authentication:

  /var/log/syslog
  Apr 28 17:45:52 hostname winbindd[769]: [2016/04/28 17:45:52.415470,  0] ../source3/lib/smbldap.c:575(smbldap_start_tls)
  Apr 28 17:45:52 hostname winbindd[769]:   Failed to issue the StartTLS instruction: Connect error
  Apr 28 17:45:52 hostname winbindd[769]: [2016/04/28 17:45:52.898408,  0] ../source3/lib/smbldap.c:575(smbldap_start_tls)
  Apr 28 17:45:52 hostname winbindd[769]:   Failed to issue the StartTLS instruction: Connect error

  
  We had to rollback to: 2:4.1.6+dfsg-1ubuntu2.14.04.13 and everything worked again.

  Here's a basic samba config that reproduces the issue:

  Perfectly reproducible with this:
    realm = AD.DOMAIN.COM
    security = ads
    ldap ssl = start_tls
    ldap ssl ads = yes

  [LDAP] TLS: hostname (172.12.12.12) does not match common name in certificate (hostname).
  [LDAP] ldap_err2string
  Failed to issue the StartTLS instruction: Connect error

  Samba seems to construct the LDAP URL with the IP of the AD controller
  in it instead of the hostname and then because our ldap.conf requires
  it, the server cert validation fails

  Please let me know if there are any other logs I can provide

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