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hunchentoot-auth

This package is for implementing user authentication with passwords
for the hunchentoot Common Lisp web server.

The core unit of hunchentoot-auth is the realm. Currently a realm is
just a persistent "bag" for holding users and their associated (hashed)
passwords, along with the beginnings of support for groups. 

In the initial incarnation, realms use the cl-store module for storing
the users and groups information for the realm. This is clearly not
the most efficient approach, but works well enough for a small number
of users.

To create a realm, one can use a lisp expression such as:


  (defparamter *test-realm-directory "/tmp/myrealm/")

  (ensure-directories-exist *test-realm-directory*)

  (defparameter *test-realm*
    (make-instance 'ht-auth:realm
                   :user-storage-path
                   (merge-pathnames "users.store"
                                    *test-realm-directory*)
                   :group-storage-path
                   (merge-pathnames "groups.store"
                                    *test-realm-directory*)))


Then to add users to the realm, one would use the following code:


  (ht-auth:add-user *test-realm* "alice" "secret1")


This would add the user "alice" to the realm with the password
"secret1". Note that the password is not directly stored in the
persistent storage, but rather the password is appended to a random
(per-user) salt (which is stored in the persistent database) and this
salted uesr name is then hashed using the MD5 hashing algorithm. The
hash of the salted password is stored in the database. To subsequently
verify if a given password matches that of the user, the (per-user)
salt is prepened to the candidate password, this string is then hashed
and compared to the hash stored in the realm.

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