OpenID-eID

Here are my attempts to create an OpenID provider based on the Belgian eID

Install packages

Let's get apache2, php5 and openssl stuff:

apt-get install apache2-utils apache2-mpm-prefork libapache2-mod-php5 php5 openssl ssl-cert

Setup apache server with SSL

Create self-signed certificate

make-ssl-cert /usr/share/ssl-cert/ssleay.cnf /etc/apache2/ssl/apache.pem

Little problem: by default the certificate is valid only 30 days, you've to edit make-ssl-cert script and add "-days" options, e.g:

openssl req -days 1024 ...

Verify generated certificate

openssl x509 -text -in /etc/apache2/ssl/apache.pem

Start from ssl example config

zcat /usr/share/doc/apache2.2-common/examples/apache2/extra/httpd-ssl.conf.gz \
  > /etc/apache2/sites-available/default-ssl

Activates ssl module

a2enmod ssl

Activates ssl virtualhost

a2ensite default-ssl

Edit /etc/apache2/sites-available/default-ssl

SSLCertificateFile /etc/apache2/ssl/apache.pem
#SSLCertificateKeyFile not required as apache.pem contains also the key

And the usual stuff

DocumentRoot "/var/www"
ServerName ...
ServerAdmin ...
ErrorLog /var/log/apache2/error.log
TransferLog /var/log/apache2/access.log

To activate only the secure ciphers:

SSLCipherSuite HIGH:MEDIUM:!ADH
SSLProtocol -ALL +SSLv3 +TLSv1

Adding Belgian Government Root certificates

You can extract the Belgium Root CA and the Citizen CA from your eID:

pkcs15-tool --read-certificate 04 > /etc/apache2/ssl/ca/belgium.crt
pkcs15-tool --read-certificate 06 >> /etc/apache2/ssl/ca/belgium.crt

Then add client certificate requirements to /etc/apache2/sites-available/default-ssl

SSLCACertificateFile /etc/apache2/ssl/ca/belgium.crt
SSLOptions +StrictRequire
SSLVerifyClient require
SSLVerifyDepth  10
<Location />
 # accept only certificates emitted by Citizen CA:
 SSLRequire %{SSL_CLIENT_I_DN_C} eq "BE" \
   and %{SSL_CLIENT_I_DN_CN} in {"Citizen CA"}
</Location>

According to the doc, because of a bug in Internet Explorer, you also need to add GlobalSign Root certificate...

Retrieving citizens' certificate information

The REMOTE_USER header can be used.
To set it to the user's distinguish name:

SSLUserName SSL_CLIENT_S_DN

Or the user's national number:

SSLUserName SSL_CLIENT_S_DN_serialNumber

TODO: cf apache SSL reverse proxy proposed by the government

• OCSP support for mod_ssl

Add to /etc/apache2/sites-available/default-ssl:

SSLUseOCSP         on
SSLForceValidation on

• Certificate validation problems trapping

Add to /etc/apache2/sites-available/default-ssl:

SSL_Error_DefaultURL "/error/invalid.html"
SSL_Error_URL  23   "/error/revoked.html"
SSL_Error_URL  10   "/error/expired.html"

Hacking phpMyID

Details on the patch

• remove HTTP Digest for the authorization step
• redirect authorization to HTTPS as we'll deal with SSL client certificates