RE: [users@httpd] Authorization header without password for basic authentication on a reverse proxy

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> -----Original Message-----
> From: Hayo Schmidt [mailto:strato@xxxxxxx] 
> Sent: Donnerstag, 9. Februar 2006 12:16
> To: users@xxxxxxxxxxxxxxxx
> Subject: [users@httpd] Authorization header without password 
> for basic authentication on a reverse proxy 
> 
> I have set up a reverse proxy (mod_proxy) on Apache 2.0.53 on 
> SuSE Linux 
> 9.3. The reverse proxy successfully handles basic authentication and 
> then forwards to the protected web server. The authentication 
> is handled 
> by mod_auth_ldap against a M$ Active Directory Server.
> 
> The user and password are transferred by standard apache 
> functionality 
> in a http request header parameter called 'authorization'. 
> The value of 
> the parameter looks something like this:  'Basic 
> WErwSrweW4Dsaf3_'. The 
> first means basic authentication, the latter is 
> '<userid>:<password>' in 
> a Base64-encoded format. I trust the authentication on Apache 
> and would 
> like to remove this unencrypted password, so that only the userid is 
> transferred to the web server. It is a security issue not to disclose 
> the password to anyone behind the reverse proxy.
> 
> Is there any configuration where this can be set?

It is the browser that forms the "Authorization" header. The apache proxy simply forwards the header (along with all the other headers in the request) to the backend server. 

If you don't want to pass this header in the proxy-backend network, you could protect the realm in the proxy and have it open in the backend; eg:

In proxy:

<Location /path/to/realm>
  Auth directives
  Require valid-user
</Location>

ProxyPass /path/to/realm http://backend-server
ProxyPassReverse /path/to/realm http://backend-server

In backend:

- remove Auth directives


Rgds,
Owen Boyle
Disclaimer: Any disclaimer attached to this message may be ignored. 


> 
> In case it cannot be configured: Which module of apache 
> handles setting 
> the authorization header? I did not find anything in the 2.0 sources 
> (mod_proxy.c; mod_proxy_util.c; 
> mod_proxy_http.c;mod_auth_ldap.c....). 
> Are there useful changes with Apache 2.2?
> 
> Hayo Schmidt
> 
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