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Frédéric,

On 4/22/14, 12:38 PM, Frédéric Poliquin wrote:
> Passwords are protected using standard SSL. Eventually, the plan
> is to move towards OAuth 2.0 with a cookie/security token but until
> then I needed a quick solution...
> 
> For the other question, Apache httpd has an authentication cache 
> which prevents going to Active Directory every time which is not 
> linked to any session. It is documented here: 
> http://httpd.apache.org/docs/current/mod/mod_ldap.html#cache

For those readers who don't feel like reading/understanding the
documentation, what Frédéric is leaving unsaid is that mod_ldap caches
the results of various lookups. It's somewhat important to note that
the authentication information itself is not cached: there is no LDAP
token or anything like that that survives across individual requests
from a client. Instead, the result of a particular lookup are cached.

This means that if the user changes their password or the
group-membership changes on the LDAP side, httpd won't know about
those changes and therefore old credentials are still valid, old
group-based authentication checks will yield invalid authentication
decisions based upon the canonical LDAP service's view of the world.

This may not be a big deal to you, but it's important to note that it
is a side-effect of such caching.

- -chris
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