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 user's distinguish name can be retrieved from php with

$_SERVER['SSL_CLIENT_S_DN']

And the user's name with

$_SERVER['SSL_CLIENT_S_DN_CN']

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

Enable ssl_error_module:

LoadModule ssl_error_module modules/mod_ssl_error.so

And add to /etc/apache2/sites-available/default-ssl:

<IfModule mod_ssl_error.c>
SSL_Error_DefaultURL "/error/invalid.html"
SSL_Error_URL  23   "/error/revoked.html"
SSL_Error_URL  10   "/error/expired.html"
</IfModule>

cf doc...

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
• TODO

Status:

• I could validate the client certificate against the root CA and I could extract the data of the certificate
• I could create various OpenIDs based on the certificate data
  Everything is extracted only from the names and RRN, not on the serial nr of the certificate or any part prone to be changed if you've to renew your ID card! (unless they change the way they write your name on the certificate...)
• I added a discover mode which tells you what are your OpenIDs given your own eID, you can try here:

http://id.yobi.be/?openid.mode=discover

Note that the proposed OpenIDs are not yet working but you can try them manually with e.g. for mine:

http://id.yobi.be/?openid.mode=login&id=ae96fba0cd9515cd
http://id.yobi.be/?openid.mode=login&id=philippe.teuwen.159
http://id.yobi.be/?openid.mode=login&id=philippe.yvon.teuwen

Estonian counterpart plans to provide simply firstname.lastname and to build an index in case of clashes.
But this requires to have a stateful server and I don't want that, I want anybody to build his own service and the generated OpenIDs will always be the same, only depending on the certificate data, not on "who came first".

Todo:

• Find a way to incorporate the id in the OpenID string and to extract it
• Maybe we'll need to fix the links embedded in the openid server & delegate
• Test it with http://www.openidenabled.com/resources/openid-test/checkup
• CRL & cf TODO patches above
• Security: given the name and hash can we guess the RNN?