121 lines
5.1 KiB
Python
121 lines
5.1 KiB
Python
from django.utils import httpwrappers
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from django.core import template_loader
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from django.core.extensions import DjangoContext as Context
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from django.models.auth import sessions, users
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from django.views.registration import passwords
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import base64, md5
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import cPickle as pickle
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# secret used in pickled data to guard against tampering
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TAMPER_SECRET = '09VJWE9_RIZZO_j0jwfe09j'
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ERROR_MESSAGE = "Please enter a correct username and password. Note that both fields are case-sensitive."
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class AdminUserRequired:
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"""
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Admin middleware. If this is enabled, access to the site will be granted only
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to valid users with the "is_staff" flag set.
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"""
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def process_view(self, request, view_func, param_dict):
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"""
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Make sure the user is logged in and is a valid admin user before
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allowing any access.
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Done at the view point because we need to know if we're running the
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password reset function.
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"""
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# If this is the password reset view, we don't want to require login
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# Otherwise the password reset would need its own entry in the httpd
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# conf, which is a little uglier than this.
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if view_func == passwords.password_reset or view_func == passwords.password_reset_done:
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return
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# Check for a logged in, valid user
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if self.user_is_valid(request.user):
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return
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# If this isn't alreay the login page, display it
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if not request.POST.has_key('this_is_the_login_form'):
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if request.POST:
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message = "Please log in again, because your session has expired. "\
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"Don't worry: Your submission has been saved."
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else:
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message = ""
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return self.display_login_form(request, message)
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# Check the password
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username = request.POST.get('username', '')
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try:
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user = users.get_object(username__exact=username)
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except users.UserDoesNotExist:
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message = ERROR_MESSAGE
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if '@' in username:
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# Mistakenly entered e-mail address instead of username? Look it up.
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try:
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user = users.get_object(email__exact=username)
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except users.UserDoesNotExist:
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message = "Usernames cannot contain the '@' character."
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else:
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message = "Your e-mail address is not your username. Try '%s' instead." % user.username
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return self.display_login_form(request, message)
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# The user data is correct; log in the user in and continue
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else:
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if self.authenticate_user(user, request.POST.get('password', '')):
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if request.POST.has_key('post_data'):
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post_data = decode_post_data(request.POST['post_data'])
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if post_data and not post_data.has_key('this_is_the_login_form'):
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# overwrite request.POST with the saved post_data, and continue
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request.POST = post_data
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request.user = user
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request.session = sessions.create_session(user.id)
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return
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else:
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response = httpwrappers.HttpResponseRedirect(request.path)
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sessions.start_web_session(user.id, request, response)
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return response
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else:
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return self.display_login_form(request, ERROR_MESSAGE)
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def display_login_form(self, request, error_message=''):
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if request.POST and request.POST.has_key('post_data'):
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# User has failed login BUT has previously saved 'post_data'
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post_data = request.POST['post_data']
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elif request.POST:
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# User's session must have expired; save their post data
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post_data = encode_post_data(request.POST)
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else:
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post_data = encode_post_data({})
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t = template_loader.get_template(self.get_login_template_name())
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c = Context(request, {
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'title': 'Log in',
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'app_path': request.path,
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'post_data': post_data,
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'error_message': error_message
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})
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return httpwrappers.HttpResponse(t.render(c))
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def authenticate_user(self, user, password):
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return user.check_password(password) and user.is_staff
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def user_is_valid(self, user):
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return not user.is_anonymous() and user.is_staff
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def get_login_template_name(self):
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return "login"
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def encode_post_data(post_data):
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pickled = pickle.dumps(post_data)
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pickled_md5 = md5.new(pickled + TAMPER_SECRET).hexdigest()
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return base64.encodestring(pickled + pickled_md5)
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def decode_post_data(encoded_data):
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encoded_data = base64.decodestring(encoded_data)
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pickled, tamper_check = encoded_data[:-32], encoded_data[-32:]
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if md5.new(pickled + TAMPER_SECRET).hexdigest() != tamper_check:
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from django.core.exceptions import SuspiciousOperation
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raise SuspiciousOperation, "User may have tampered with session cookie."
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return pickle.loads(pickled)
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