Re: Authenticating users based on S/MIME certificate

[Matt Stevenson]

Hi,

Have a look at mod_authz_ldap (ldap baseed white listing,
http://authzldap.othello.ch/). Probably far more than you need but it
does things along the same lines and has some nice notes how to do
various bits and pieces.

You can add env vars that you can use php have a look at  SSLOptions 
+StdEnvVars  and +ExportCertData.

Regards
Matt



- Original Message 
From: Gunnar Vestergaard <[EMAIL PROTECTED]>
To: modssl-users@modssl.org
Sent: Sunday, September 21, 2008 12:10:16 AM
Subject: Authenticating users based on S/MIME certificate

Hi. I am an administrator of a user account at an Apache web server. 
Currently the server is running Apache 1.3.37. My hosting provider plans 
on switching to new hardware with possibly new software. So I don't know 
if my web server will be run on Apache 1.3.37 or Apache 2.0.

My goal is to let visitors of my web site authenticate themselves to my 
web server using some certificate, possibly S/MIME certificates.

Now, my current S/MIME certificate for personal e-mail is approved for 
the following purposes:
Email Signer Certificate
Email Recipient Certificate

Is it possible to have such a certificate authenticate its user towards 
an SSL web server? In any case I want to have a limited crowd of users 
seeing a subdirectory of pages without bothering the user with a user 
name/password dialog. Just their personal certificate lets them see 
pages in a certain subdirectory.

As I understand the documentation for PHP, there is no means whereby PHP 
can read and interpret an SSL client certificate. Is that correct?

Gunnar
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Re: Authenticating users based on S/MIME certificate

[Dave Sparks]

Gunnar Vestergaard wrote:

> My goal is to let visitors of my web site authenticate themselves to
> my web server using some certificate, possibly S/MIME certificates.

> As I understand the documentation for PHP, there is no means whereby
> PHP can read and interpret an SSL client certificate. Is that correct?

It's possible to configure Apache 2 to add the client certificate to a 
request header.  From one of my configuration files:


  RewriteCond ${ESC:%{SSL:SSL_CLIENT_CERT}} \
^.*(-BEGIN%20(X509%20|TRUSTED%20|)CERTIFICATE-(%0[Dd])?%0[Aa].*%0[Aa]-END%20\2CERTIFICATE-(%0[Dd])?%0[Aa]).*$
  RewriteRule ^.*$ - [E=CLIENT_CERT:%1]

  RequestHeader unset L-ClientCert

  RequestHeader set L-ClientCert %{CLIENT_CERT}e env=CLIENT_CERT

The certificate is %-encoded to avoid problems with newline characters. 
 Presumably PHP can use the string in the header to match the 
certificate against a list of known certificates.


The certificate digest would be less unwieldy than the entire 
certificate, but mod_ssl would need some simple changes to make the 
digest available and I would be reluctant to use a hosting provider who 
allowed customers to use a modified mod_ssl.



Dave Sparks

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