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From Igor Cicimov <icici...@gmail.com>
Subject Re: [users@httpd] Conditionally strip/remove a specific cookie from request
Date Mon, 10 Dec 2012 04:04:03 GMT
On Mon, Dec 10, 2012 at 2:10 PM, <ohaya@cox.net> wrote:

>
> ---- Igor Cicimov <icicimov@gmail.com> wrote:
> > On Mon, Dec 10, 2012 at 11:02 AM, <ohaya@cox.net> wrote:
> >
> > >
> > > ---- Igor Cicimov <icicimov@gmail.com> wrote:
> > > > On Mon, Dec 10, 2012 at 9:02 AM, <ohaya@cox.net> wrote:
> > > >
> > > > >
> > > > > ---- Igor Cicimov <icicimov@gmail.com> wrote:
> > > > > > On Mon, Dec 10, 2012 at 7:19 AM, <ohaya@cox.net> wrote:
> > > > > >
> > > > > > > Hi,
> > > > > > >
> > > > > > > We are trying to have an Apache (acting as a proxy)
> conditionally
> > > > > > > strip/remove a cookie from the incoming request, before
it
> proxies
> > > the
> > > > > > > request.
> > > > > > >
> > > > > > > The condition is that, on the incoming request:
> > > > > > >
> > > > > > > - there is a specific HTTP header, MYHEADER, with a value
of
> > > > > > > "MYHEADERVALUE", and
> > > > > > > - the root of the request URL's hostname (e.g., if hostname
in
> the
> > > > > request
> > > > > > > URL is "www.foo.com", then root is ".foo.com") matches
a
> certain
> > > > > string,
> > > > > > > e.g., ".whatever.com"
> > > > > > >
> > > > > > > If the conditions above are true, then we want to remove
a
> cookie
> > > named
> > > > > > > "MYCOOKIE" from the incoming request, before forwarding
the
> request
> > > > > onto
> > > > > > > the proxied host.
> > > > > > >
> > > > > > > I think that if the conditions match, according to this:
> > > > > > >
> > > > > > >
> > > > >
> > >
> http://stackoverflow.com/questions/1798431/how-to-remove-a-cookie-in-apache
> > > > > > >
> > > > > > > something like:
> > > > > > >
> > > > > > > RequestHeader add Cookie "MYCOOKIE='';expires='SOME_PAST_DATE';
> > > > > > > Path=COOKIE_PATH"
> > > > > > >
> > > > > > > would remove the cookie, but I'm not sure how to construct
the
> > > > > > > expression/expr that says something like this:
> > > > > > >
> > > > > > > <If hostname_root==whatever.com && MYHEADER=<some_string>>
> > > > > > >         RequestHeader add Cookie
> > > "MYCOOKIE=';expires='SOME_PAST_DATE';
> > > > > > > Path=COOKIE_PATH"
> > > > > > > </If>
> > > > > > >
> > > > > > > Also, I'm not sure what that "SOME_PAST_DATE" should be.
> > > > > > >
> > > > > > > Can anyone here tell me?
> > > > > > >
> > > > > > > Thanks,
> > > > > > > Jim
> > > > > > >
> > > > > > >
> > > ---------------------------------------------------------------------
> > > > > > > To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> > > > > > > For additional commands, e-mail: users-help@httpd.apache.org
> > > > > > >
> > > > > > >
> > > > > > Use SetEnvIf
> > > > >
> > > > >
> > > > > Igor,
> > > > >
> > > > > I think that I can use SetEnvIf to set environment variables for
> each
> > > of
> > > > > the two conditions, but doesn't the RequestHeader directive only
> take
> > > only
> > > > > a single condition, e.g., "env=condition1"?
> > > > >
> > > > > Jim
> > > > >
> > > > >
> ---------------------------------------------------------------------
> > > > > To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> > > > > For additional commands, e-mail: users-help@httpd.apache.org
> > > > >
> > > > > True, so how about this ... You set the cookie if "env =
> condition1"
> > > and
> > > > then edit/unset/merge/ or do whatever if "env != condition2"
> > >
> > >
> > > Hi,
> > >
> > > Thanks for the suggestion.  I guess that I'd really rather not set the
> > > cookie then possibly have to unset it later.  That seems a little too
> > > convoluted.
> > >
> > > What I was trying to find out with this post is about how something
> like
> > > SetEnvIfExpr:
> > >
> > > http://httpd.apache.org/docs/trunk/mod/mod_setenvif.html#setenvifexpr
> > >
> >
> > That link has the word "trunk" in it which usually means "current
> > development version". And if you check the bread crumbs in the top of the
> > page you'll see
> >
> > [image: <-] <http://httpd.apache.org/docs/trunk/mod/>
> >  Apache <http://www.apache.org/> > HTTP Server <http://httpd.apache.org/>
> >
> > Documentation <http://httpd.apache.org/docs/> > Version
> > 2.5<http://httpd.apache.org/docs/trunk/>>
> > Modules <http://httpd.apache.org/docs/trunk/mod/>
> >
> > it is a Apache 2.5 module. If you need to use this feature AND <If> tags
> > you need Apache 2.4
> >
> >
> > >
> > > might be used.
> > >
> > > Apparently this SetEnvIfExpr is available in Apache 2.2.9+?
> > >
> > > That page has some examples of using SetEnvIfExpr, e.g.:
> > >
> > > SetEnvIfExpr "tolower(req('X-Sendfile')) == 'd:\images\very_big.iso')"
> > > iso_delivered
> > >
> > > plus, it links to this other page on expressions in Apache:
> > >
> > > http://httpd.apache.org/docs/trunk/expr.html
> > >
> > > which has examples of expressions:
> > >
> > > # Compare the host name to example.com and redirect to www.example.comif
> > > it matches
> > > <If "%{HTTP_HOST} == 'example.com'">
> > >     Redirect permanent / http://www.example.com
> > > </If>
> > >
> > > So I was thinking I could use something like that, but I'm not familiar
> > > with these "expressions", so I was hoping that someone here could tell
> me
> > > (or point the way to) the expression that I'd need to do what I
> described
> > > in my original post.
> > >
> > > Also, BTW, I'm having problems with what was suggested in the message
> > > thread on Stackoverflow.com in my original post.  I tried the suggested
> > > RequestHeader, to try to remove a cookie in an incoming request, but
> it's
> > > not working.  Rather it looks like it just replaces the entire
> "Cookie:"
> > > header altogether.  FYI, for this testing, I have my Apache proxying
> > > (ProxyPass/ProxyPassReverse) a Tomcat instance.
> > >
> > > Thanks,
> > > Jim
> > >
> > >
> > >
> > > ---------------------------------------------------------------------
> > > To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> > > For additional commands, e-mail: users-help@httpd.apache.org
> > >
> > >
>
>
> Hi Igor,
>
> I realized that a little while ago, and just built 2.4.3, and yes, the
> <If> works, or at least it doesn't throw and error with that.
>
> Any idea on what the expr should look like to do what I was asking about?
>  I'm still trying to figure that out.  If anyone knows, or maybe give me
> some hints, I'd appreciate that.
>
> Thanks,
> Jim
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org
>
>
Try this (completely untested):

SetEnvIfNoCase ^My_Header$ MYHEADERVALUE has_the_header
SetEnvIfNoCase %{HTTP_HOST} ^(www.)?example.com" has_the_hostname
<If env('has_the_header') && env('has_the_hostname')>
   RequestHeader unset Cookie
</If>

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