Re: mod_ssl, client certificates and r->username

Martin Kuba <makub@xxxxxxxxxxx> · Fri, 21 Jan 2011 12:07:19 +0100

Hi Tom,

the normal access log does not contain SSL information. If you want it,
create a special log using the directive CustomLog, i.e.

CustomLog "|/usr/bin/cronolog /var/log/apache2/%Y/%m/%d/ssl_request.log" "%v:%p %h %l %u %t \"%r\" %>s %b \"%{User-Agent}i\" SSL_PROTOCOL=%{SSL_PROTOCOL}x SSL_CLIENT_S_DN=\"%{SSL_CLIENT_S_DN}x\" 

SSL_CLIENT_I_DN=\"%{SSL_CLIENT_I_DN}x\" SSL_CLIENT_VERIFY=\"%{SSL_CLIENT_VERIFY}x\""

See http://httpd.apache.org/docs/2.2/mod/mod_log_config.html#formats  for details.

By the way, I suggest you to replace the "SSLVerifyClient require" with

SSLVerifyClient optional
SSLRequire %{SSL_CLIENT_VERIFY} eq "SUCCESS"
ErrorDocument 403 /certneedederror.html

The big advantage is that when something goes wrong, the user will get
a web page with a nice error message you have written, instead of some weird
browser popup dialog window with an internal SSL error code.

Best regards

Martin

Dne 21.1.2011 11:24, Tom Evans napsal(a):

Hi all

Apache/2.2.17 (FreeBSD)

I'm trying to use client certificates to authenticate my few users. I
created a self-signed CA, server certificates and user certificates,
and installed them in the appropriate places. I then created a vhost:

<VirtualHost *:443>
     ServerName rc.ketbun.com
     SSLEngine on
     SSLCertificateFile /etc/ssl/ketbun/star.ketbun.com/apache.crt
     SSLCertificateKeyFile /etc/ssl/ketbun/star.ketbun.com/apache.key
     SSLCACertificateFile /etc/ssl/ketbun/ca.crt
     SSLVerifyClient require
     SSLVerifyDepth 1
     SSLCARevocationFile /etc/ssl/ketbun/ca.crl
     SSLOptions +FakeBasicAuth +StdEnvVars
     RequestHeader set X-Username %{SSL_CLIENT_S_DN_Email}s
</VirtualHost>

This all works nicely, and users can only access if they have been
issued with keys/certificates and installed them in their browser.
However, I can't seem to get any of these details to be logged.

Without creating phony .htpasswd files listing all my users with dummy
passwords, is there any way to extract an attribute from the client
certificate's DN and use that to populate r->username? FakeBasicAuth
doesn't seem to want to do anything without the dummy .htpasswd, and
whilst I can pass the information easily enough to the webapps without
this (adding it as a request header), this doesn't help me get the
info into the access logs.

Any ideas?

Cheers

Tom

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