Not so long ago, Kaeru pointed me to a zope script for such purpose, however, the script fails to extract passwords from Plone3.0 mainly due to passwords are now managed by the PluggableAuthService - which made getPassword() to return None and _getPassword() to raise NotImplementedError. I don't know whether somebody forgot to implement those functions into PAS or it was purposely done. Googling lead me to this page in plone.org and from there, to this other script. Again, none of them able to extract the password hashes. I lost hope with google, and to the source I went.
After a whole night digging through the plone source, at last, I managed to found the method to extract the hash. So, heres the External Script which I wrote to extract stuff I want.
# Memberdata export script for Plone 3.0
# based on:
# None of the scripts above can extract password hashes on Plone3.0,
# BUT THIS ONE CAN!!!
# Execute this as normal External Script, and DON'T make it public accessible
# (unless you don't mind people having your hashes). You have been warned.
# Have fun (^,^)
from StringIO import StringIO
request = self.REQUEST
text = StringIO()
writer = csv.writer(text)
# core properties (username/password)
core_properties = ['member_id','password']
# extra portal_memberdata properties
extra_properties = ['fullname',
properties = core_properties + extra_properties
for memberId in membership.listMemberIds():
row = 
for property in properties:
if property == 'member_id':
elif property == 'password':
member = membership.getMemberById(memberId)
Have fun (^.^)