[users@httpd] Environment Variable contamination between vhosts - 1.3.33

[Marc Powell <ma...@ena.com>]

Hi all,

First time poster here so I apologize in advance for any gaffs. I've
Googled, searched the archives and the FAQ but can't find anything close
to what I'm experiencing.

I have apache-1.3.33, mod_ssl-2.8.22 (with patches), php-4.3.2 (with
patches), mod_perl-1.29-5 (with patches) running with the following
additional modules --

mod_jk.c, mod_ssl.c, mod_php4.c, mod_perl.c, mod_setenvif.c, mod_so.c,
mod_unique_id.c, mod_headers.c, mod_expires.c, mod_auth_db.c,
mod_auth_anon.c, mod_auth.c, mod_access.c, mod_rewrite.c, mod_alias.c,
mod_userdir.c, mod_actions.c, mod_imap.c, mod_asis.c, mod_cgi.c,
mod_dir.c, mod_autoindex.c, mod_include.c, mod_info.c, mod_status.c,
mod_negotiation.c, mod_mime.c, mod_log_referer.c, mod_log_agent.c,
mod_log_config.c, mod_env.c, mod_vhost_alias.c, http_core.c

This server is handling a half dozen HTTP/HTTPS vhost pairs. Each vhost
is running on a separate IP ala --

Listen 1.1.1.1:80
Listen 1.1.1.1:443
<VirtualHost 1.1.1.1:80>
...
</VirtualHost>
<VirtualHost 1.1.1.1:443>
...
</VirtualHost>

Listen 1.1.1.2:80
Listen 1.1.1.2:443
<VirtualHost 1.1.1.2:80>
...
</VirtualHost>
<VirtualHost 1.1.1.2:443>
...
</VirtualHost>

And so forth... We discovered a problem where the HTTPS environment
variable was incorrectly being set to ON for normal HTTP requests for
one of our vhosts running SquirrelMail. Further investigation revealed
that a number of environment variables were being cross-contaminated
between virtual hosts. For example, running phpinfo() under VirtualHost
1.1.1.1 would yield the following on one request (with no contamination)
--

_SERVER["REMOTE_ADDR"]	172.27.a.a
_SERVER["REMOTE_PORT"]	3477
_SERVER["SCRIPT_FILENAME"]	/path/to/phpinfo.php
_SERVER["SERVER_ADDR"]	1.1.1.1
_SERVER["SERVER_ADMIN"]	noc@ena.com
_SERVER["SERVER_NAME"]	my.vhost1.foo
_SERVER["SERVER_PORT"]	80
_SERVER["SERVER_SIGNATURE"]	no value
_SERVER["SERVER_SOFTWARE"]	Apache
_SERVER["UNIQUE_ID"]	QvPfa38AAAEAAEgoDnc
_SERVER["GATEWAY_INTERFACE"]	CGI/1.1
_SERVER["SERVER_PROTOCOL"]	HTTP/1.0
_SERVER["REQUEST_METHOD"]	GET
_SERVER["QUERY_STRING"]	no value
_SERVER["REQUEST_URI"]	/phpinfo.php
_SERVER["SCRIPT_NAME"]	/phpinfo.php
_SERVER["PATH_TRANSLATED"]	/path/to/phpinfo.php
_SERVER["PHP_SELF"]	/phpinfo.php

And a few _ENV[] variables set such as HOSTNAME, etc... A refresh
however might return the following additions --

_SERVER["REMOTE_ADDR"] 172.27.a.a 
_SERVER["REMOTE_PORT"] 2901 
_SERVER["SCRIPT_FILENAME"] /path/to/phpinfo.php 
_SERVER["SERVER_ADDR"] 1.1.1.1 
_SERVER["SERVER_ADMIN"] noc@ena.com 
_SERVER["SERVER_NAME"] my.vhost1.foo 
_SERVER["SERVER_PORT"] 80
_ENV["HTTPS"]	on
_ENV["REMOTE_ADDR"]	66.5.b.b
_ENV["REMOTE_PORT"]	4947
_ENV["SCRIPT_FILENAME"]	/path/to/some/other/site/login
_ENV["SERVER_ADDR"]	1.1.1.2
_ENV["SERVER_ADMIN"]	noc@ena.com
_ENV["SERVER_NAME"]	my.vhost2.foo
_ENV["SERVER_PORT"]	443
_ENV["SERVER_SIGNATURE"]	no value
_ENV["SERVER_SOFTWARE"]	Apache
_ENV["ssl-unclean-shutdown"]	1
_ENV["UNIQUE_ID"]	QvPfr38AAAEAAEgqEyQ
_ENV["GATEWAY_INTERFACE"]	CGI-Perl/1.1
_ENV["SERVER_PROTOCOL"]	HTTP/1.1
_ENV["REQUEST_METHOD"]	POST
_ENV["QUERY_STRING"]	no value
_ENV["REQUEST_URI"]	/login
_ENV["SCRIPT_NAME"]	/login

Essentially, I am seeing the environment variables (at the least) for
someone else's request to a completely different vhost on a completely
different Listen IP. Has anyone seen this before? Any direction where to
look? I've tried disabling mod_env just to see if that was it but it had
no effect. I can't easily disable mod_perl or mod_php for testing
purposes as this is a production machine. I actually have two machines
that are experiencing this. Both are identical. I've been searching for
a couple of days now but I apparently can't hit on the right combination
of terms ;) In 8 years of using Apache this is the first time I've seen
anything like this. I'm not convinced this is an apache _daemon_ issue
so feel free to direct me somewhere else more appropriate (i.e.
mod_perl, etc).

Any hints or guidance would really be appreciated.

Thanks.

--
Marc Powell
Senior Systems Engineer
ENA/ConnecTEN
marc@ena.com

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Re: [users@httpd] Environment Variable contamination between vhosts - 1.3.33

[Joshua Slive <js...@gmail.com>]

On 8/5/05, Marc Powell <ma...@ena.com> wrote:
> And so forth... We discovered a problem where the HTTPS environment
> variable was incorrectly being set to ON for normal HTTP requests for
> one of our vhosts running SquirrelMail. Further investigation revealed
> that a number of environment variables were being cross-contaminated
> between virtual hosts. For example, running phpinfo() under VirtualHost
> 1.1.1.1 would yield the following on one request (with no contamination)

The first thing to do is to repeat this test with a standard CGI
script that dumps the environment (one is included with apache httpd).
 This will help you figure out if it is a php problem or a general
apache problem.

Joshua.

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