I have an ssl built mongo running version 2.4.6. I started a mongod instance using the following configuration:

mongod --port 10023 --dbpath /home/administrator/data --sslOnNormalPorts --sslPEMKeyFile /etc/ssl/mongod_keymaterial.pem --sslPEMKeyPassword xxxxx --sslCAFile /etc/ssl/root-ca.pem --logpath /home/administrator/mongod_log.txt

There is no way to provide sslPEMKeyPassword option with the current python driver