Generate a plone.session cookie for an arbitrary user, given access to the server

login.py

import binascii
session = app.site.acl_users.session

while True:
    username = raw_input("User ID: ")
    if not username:
        break
    if app.site.acl_users.getUserById(username) is None:
        print "User not found"
        continue
    ticket = session.source.createIdentifier(username)
    cookie = binascii.b2a_base64(ticket).rstrip()
    print "document.cookie = '%s=%s'" % (session.cookie_name, cookie)

I love you for this.