keystone/releasenotes/notes/bug-1649138-c53974f6bb0eab14.yaml
Colleen Murphy f8ee249bf0 Add anonymous bind to get_connection method
If no username and password is specified in the keystone ldap
configuration, it may still be possible to bind to an LDAP server
anonymously if the LDAP server is configured to allow it. Currently,
upon creating a connection object, keystone only attempts to bind to
the LDAP server if a username and password has been provided to it.
This would rarely be an issue because pyldap attempts a reconnect upon
executing any ldap command, if necessary, and hence the anonymous bind
just happens later. It is a problem now because logic was added[1] to
check if the server errored during that initial connection, and for it
to work correctly the initial connection needs to happen in a
predictable place. This patch adds an anonymous bind to the
get_connection method so that no matter the credential configuration
the initial connection is consistent.

This required adding mocks to many of the LDAP backend tests since
every LDAP interaction now attempts a simple_bind_s() regardless of
whether credentials are configured in keystone.

[1] https://review.openstack.org/#/c/390948

Closes-bug: #1649138

Change-Id: I193c9537c107092e48f7ea1d25ff9c17f872c15b
2017-01-12 04:02:24 +00:00

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---
fixes:
- >
[`bug 1649138 <https://bugs.launchpad.net/keystone/+bug/1649138>`_]
When using LDAP as an identity backend, the initial bind will now
occur upon creation of a connection object, i.e. early on when
performing LDAP queries, no matter whether the bind is
authenticated or anonymous, so that any connection errors can be
handled correctly and early.