Re: Most secure way of authentication

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On Thu 2007-05-03 14:36:39 -0400, Rainer Sokoll wrote:

> On Thu, May 03, 2007 at 10:49:21AM -0700, Don Russell wrote:
>> Rainer Sokoll wrote:
>
>> >   RedirectMatch permanent ^/(.*) https://webmail.example.com/$1
>
>> Though that may work in many cases, the reason I do not like it is 
>> because the issue is not to change a request on port 80 to port 443,the 
>> point is to ensure https is being used.
>
> This is exactly what Redirect does: Forcing the use of https. I do not
> understand your objection - maybe I'm missing something obvious?

Don is pointing out that the case where this is triggered (inside the
VirtualHost :80 container) doesn't guarantee that https is actually
not being used.

That is, activity on port 80 implies (but does not guarantee) that TLS
is not in use.  And activity on port 443 implies (but does not
guarantee) that TLS *is* in use.  Testing that the HTTPS environment
variable provided by mod_ssl is set to "on" guarantees that TLS is
actually in use.

In practice, those implications are usually correct (and as a server
admin, you can enforce them if you choose to).  But the snippet as a
generic snippet isn't guaranteed to do the right thing in all cases.

hth,

        --dkg
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