varnish with apache mod_auth

[Andrei]

Does the CDN not provide the IP you want in a separate header? Typically
CDN's have custom headers for just that which you can use as well

On Fri, Mar 17, 2017 at 3:31 PM, Guillaume Quintard <
guillaume at varnish-software.com> wrote:

> If you have the ability to compile a vmod, you can use split() from
> vmod-str (disclaimer: I wrote that) https://github.com/
> gquintard/libvmod-str/blob/master/src/vmod_str.vcc
>
> otherwise, to get the second ip, something like :
>
> regsub(req.http.xff, "([^,]+), *([^ ,]+)[ ,]?.*", "\2")
>
> should work. Fell free to test, using regex101.com for example. or
> better, a Varnish Test case Case: https://gist.github.com/gquintard/
> ee47432bb8b5c97b615d973b57b6338e
> test it using: varnishtest foo.vtc
>
> --
> Guillaume Quintard
>
> On Fri, Mar 17, 2017 at 1:33 PM, Hernán Marsili <hernan at cmsmedios.com>
> wrote:
>
>> Thank you! so, I figure I can parse the x-forwarded-for in which I have 3
>> ips. The first one is the customer, the second one is the one 1 need (the
>> CDN) and the third I think is the load balancer.
>>
>> I can assign it to a new header x-cdn-ip and use apache_remoteip to use
>> that ip as the connecting ip.
>>
>> What do you think?
>>
>> Only problem here is to parse the second iP. I have something like this:
>>
>> set req.http.x-cdn-ip = regsub(req.http.X-Forwarded-For,
>> "^([^,]+),?.*$", "\1");
>>
>> I was able to get the first IP but not the second only which is the one I
>> need. Any one can point me in the right direction with the regsub?
>>
>> Thank you!
>>
>> On Fri, Mar 17, 2017 at 4:43 AM Andrei <lagged at gmail.com> wrote:
>>
>>> Authenticated requests should typically bypass cache, unless you want to
>>> hash the related session id(s), however that can get "interesting". I
>>> suggest using an Apache module such as rpaf or remoteip in order for Apache
>>> to set the client IP from the X-Forwarded-For header set by Varnish. This
>>> way, you will not need to worry about whitelisting localhost, or other
>>> cucumbersome iptables rules, and your IP restrictions will work as intended.
>>>
>>> On Fri, Mar 17, 2017 at 1:32 AM, Jason Price <japrice at gmail.com> wrote:
>>>
>>> I don't believe there's a trivial way to do this.
>>>
>>> Varnish will return the cached response to any IP address that comes
>>> calling.  Even if the first request comes from a valid IP, which gets
>>> passed through via X-Forward or similar, and mod_auth is tweaked to respond
>>> to that, any subsequent request will not be seen by either apache or
>>> mod_auth at all.
>>>
>>> You have a few options:
>>> 1) IP Whitelists are a rather poor means of authentication.  Moving to
>>> something else might be prudent.  But that's not easy.
>>> 2) There are probably VMODs that do something similar.  If not and if
>>> the list of IPs isn't too long, you could limit the IPs in VCL rather than
>>> mod_auth.
>>> 3) Push the list of IP addresses that can connect to the external port
>>> down to IPTables or similar.
>>> 4) Push the list of IP addresses to external Firewall, or Security Group
>>> or whatever.
>>>
>>>
>>>
>>> On Thu, Mar 16, 2017 at 5:46 PM, Hernán Marsili <hernan at cmsmedios.com>
>>> wrote:
>>>
>>> Hi,
>>>
>>> We are having an issue with VARNISH and apache mod_auth. Varnish is on
>>> port 80 serving users and Apache is the backend.
>>>
>>> We have servers restricting access only to authenticated users or
>>> certain IP addresses. Since we installed Varnish the issue is that we need
>>> to enable 127.0.0.1 as a permitted IP (required ip rule) so the Varnish can
>>> fetch content. The problem, is that the real IP is not used and all the
>>> other rules does not apply.
>>>
>>> Bottom line, how can we still control who is requesting using MOD_AUTH
>>> and having Varnish?
>>>
>>> Regards
>>> Hernán.
>>>
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>>>
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