Source code for openstack_auth.views

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import datetime
import functools
import logging

from django.conf import settings
from django.contrib import auth
from django.contrib.auth.decorators import login_required
from django.contrib.auth import views as django_auth_views
from django.contrib import messages
from django import http as django_http
from django.middleware import csrf
from django import shortcuts
from django.urls import reverse
from django.utils import http
from django.utils.translation import gettext_lazy as _
from django.views.decorators.cache import never_cache
from django.views.decorators.csrf import csrf_exempt
from django.views.decorators.csrf import csrf_protect
from django.views.decorators.debug import sensitive_post_parameters
from django.views.generic import edit as edit_views
from keystoneauth1 import exceptions as keystone_exceptions

from openstack_auth import exceptions
from openstack_auth import forms
from openstack_auth import plugin

# This is historic and is added back in to not break older versions of
# Horizon, fix to Horizon to remove this requirement was committed in
# Juno
# pylint: disable=unused-import
from openstack_auth.forms import Login  # noqa:F401
from openstack_auth import user as auth_user
from openstack_auth import utils


LOG = logging.getLogger(__name__)


def get_csrf_reason(reason):
    if not reason:
        return

    if reason not in [csrf.REASON_NO_REFERER,
                      csrf.REASON_BAD_REFERER,
                      csrf.REASON_NO_CSRF_COOKIE,
                      csrf.REASON_BAD_TOKEN,
                      csrf.REASON_MALFORMED_REFERER,
                      csrf.REASON_INSECURE_REFERER]:
        reason = ""
    else:
        reason += " "
    reason += str(_("Cookies may be turned off. "
                    "Make sure cookies are enabled and try again."))
    return reason


def set_logout_reason(res, msg):
    msg = msg.encode('unicode_escape').decode('ascii')
    res.set_cookie('logout_reason', msg, max_age=10)


def is_ajax(request):
    # See horizon.utils.http.is_ajax() for more detail.
    # NOTE: openstack_auth does not import modules from horizon to avoid
    # import loops, so we copy the logic from horizon.utils.http.
    return request.headers.get('x-requested-with') == 'XMLHttpRequest'


# TODO(stephenfin): Migrate to CBV
[docs]@sensitive_post_parameters() @csrf_protect @never_cache def login(request): """Logs a user in using the :class:`~openstack_auth.forms.Login` form.""" # If the user enabled websso and the default redirect # redirect to the default websso url if (request.method == 'GET' and settings.WEBSSO_ENABLED and settings.WEBSSO_DEFAULT_REDIRECT): protocol = settings.WEBSSO_DEFAULT_REDIRECT_PROTOCOL region = settings.WEBSSO_DEFAULT_REDIRECT_REGION origin = utils.build_absolute_uri(request, '/auth/websso/') url = ('%s/auth/OS-FEDERATION/websso/%s?origin=%s' % (region, protocol, origin)) return shortcuts.redirect(url) # If the user enabled websso and selects default protocol # from the dropdown, We need to redirect user to the websso url if request.method == 'POST': auth_type = request.POST.get('auth_type', 'credentials') request.session['auth_type'] = auth_type if settings.WEBSSO_ENABLED and auth_type != 'credentials': region_id = request.POST.get('region') auth_url = getattr(settings, 'WEBSSO_KEYSTONE_URL', None) if auth_url is None: auth_url = forms.get_region_endpoint(region_id) url = utils.get_websso_url(request, auth_url, auth_type) return shortcuts.redirect(url) if not is_ajax(request): # If the user is already authenticated, redirect them to the # dashboard straight away, unless the 'next' parameter is set as it # usually indicates requesting access to a page that requires different # permissions. if (request.user.is_authenticated and auth.REDIRECT_FIELD_NAME not in request.GET and auth.REDIRECT_FIELD_NAME not in request.POST): return shortcuts.redirect(settings.LOGIN_REDIRECT_URL) # Get our initial region for the form. initial = {} current_region = request.session.get('region_endpoint', None) requested_region = request.GET.get('region', None) regions = dict(settings.AVAILABLE_REGIONS) if requested_region in regions and requested_region != current_region: initial.update({'region': requested_region}) if request.method == "POST": form = functools.partial(forms.Login) else: form = functools.partial(forms.Login, initial=initial) choices = settings.WEBSSO_CHOICES reason = get_csrf_reason(request.GET.get('csrf_failure')) logout_reason = request.COOKIES.get( 'logout_reason', '').encode('ascii').decode('unicode_escape') logout_status = request.COOKIES.get('logout_status') extra_context = { 'redirect_field_name': auth.REDIRECT_FIELD_NAME, 'csrf_failure': reason, 'show_sso_opts': settings.WEBSSO_ENABLED and len(choices) > 1, 'classes': { 'value': '', 'single_value': '', 'label': '', }, 'logout_reason': logout_reason, 'logout_status': logout_status, } if is_ajax(request): template_name = 'auth/_login.html' extra_context['hide'] = True else: template_name = 'auth/login.html' try: res = django_auth_views.LoginView.as_view( template_name=template_name, redirect_field_name=auth.REDIRECT_FIELD_NAME, form_class=form, extra_context=extra_context, redirect_authenticated_user=False)(request) except exceptions.KeystonePassExpiredException as exc: res = django_http.HttpResponseRedirect( reverse('password', args=[exc.user_id])) msg = _("Your password has expired. Please set a new password.") set_logout_reason(res, msg) # Save the region in the cookie, this is used as the default # selected region next time the Login form loads. if request.method == "POST": utils.set_response_cookie(res, 'login_region', request.POST.get('region', '')) utils.set_response_cookie(res, 'login_domain', request.POST.get('domain', '')) # Set the session data here because django's session key rotation # will erase it if we set it earlier. if request.user.is_authenticated: auth_user.set_session_from_user(request, request.user) regions = dict(forms.get_region_choices()) region = request.user.endpoint login_region = request.POST.get('region') region_name = regions.get(login_region) request.session['region_endpoint'] = region request.session['region_name'] = region_name expiration_time = request.user.time_until_expiration() threshold_days = settings.PASSWORD_EXPIRES_WARNING_THRESHOLD_DAYS if (expiration_time is not None and expiration_time.days <= threshold_days and expiration_time > datetime.timedelta(0)): expiration_time = str(expiration_time).rsplit(':', 1)[0] msg = (_('Please consider changing your password, it will expire' ' in %s minutes') % expiration_time).replace(':', ' Hours and ') messages.warning(request, msg) return res
# TODO(stephenfin): Migrate to CBV
[docs]@sensitive_post_parameters() @csrf_exempt @never_cache def websso(request): """Logs a user in using a token from Keystone's POST.""" if settings.WEBSSO_USE_HTTP_REFERER: referer = request.META.get('HTTP_REFERER', settings.OPENSTACK_KEYSTONE_URL) auth_url = utils.clean_up_auth_url(referer) else: auth_url = settings.OPENSTACK_KEYSTONE_URL token = request.POST.get('token') try: request.user = auth.authenticate(request, auth_url=auth_url, token=token) except exceptions.KeystoneAuthException as exc: if settings.WEBSSO_DEFAULT_REDIRECT: res = django_http.HttpResponseRedirect(settings.LOGIN_ERROR) else: msg = 'Login failed: %s' % exc res = django_http.HttpResponseRedirect(settings.LOGIN_URL) set_logout_reason(res, msg) return res auth_user.set_session_from_user(request, request.user) auth.login(request, request.user) if request.session.test_cookie_worked(): request.session.delete_test_cookie() return django_http.HttpResponseRedirect(settings.LOGIN_REDIRECT_URL)
# TODO(stephenfin): Migrate to CBV
[docs]def logout(request, login_url=None, **kwargs): """Logs out the user if he is logged in. Then redirects to the log-in page. :param login_url: Once logged out, defines the URL where to redirect after login :param kwargs: see django.contrib.auth.views.logout_then_login extra parameters. """ msg = 'Logging out user "%(username)s".' % \ {'username': request.user.username} LOG.info(msg) """ Securely logs a user out. """ if (settings.WEBSSO_ENABLED and settings.WEBSSO_DEFAULT_REDIRECT and settings.WEBSSO_DEFAULT_REDIRECT_LOGOUT): auth_user.unset_session_user_variables(request) return django_http.HttpResponseRedirect( settings.WEBSSO_DEFAULT_REDIRECT_LOGOUT) return django_auth_views.logout_then_login(request, login_url=login_url, **kwargs)
# TODO(stephenfin): Migrate to CBV
[docs]@login_required def switch(request, tenant_id, redirect_field_name=auth.REDIRECT_FIELD_NAME): """Switches an authenticated user from one project to another.""" LOG.debug('Switching to tenant %s for user "%s".', tenant_id, request.user.username) endpoint, __ = utils.fix_auth_url_version_prefix(request.user.endpoint) client_ip = utils.get_client_ip(request) session = utils.get_session(original_ip=client_ip) # Keystone can be configured to prevent exchanging a scoped token for # another token. Always use the unscoped token for requesting a # scoped token. unscoped_token = request.user.unscoped_token auth = utils.get_token_auth_plugin(auth_url=endpoint, token=unscoped_token, project_id=tenant_id) try: auth_ref = auth.get_access(session) msg = 'Project switch successful for user "%(username)s".' % \ {'username': request.user.username} LOG.info(msg) except keystone_exceptions.ClientException: msg = ( _('Project switch failed for user "%(username)s".') % {'username': request.user.username}) messages.error(request, msg) auth_ref = None LOG.exception('An error occurred while switching sessions.') # Ensure the user-originating redirection url is safe. # Taken from django.contrib.auth.views.login() redirect_to = request.GET.get(redirect_field_name, '') if (not http.url_has_allowed_host_and_scheme( url=redirect_to, allowed_hosts=[request.get_host()])): redirect_to = settings.LOGIN_REDIRECT_URL if auth_ref: user = auth_user.create_user_from_token( request, auth_user.Token(auth_ref, unscoped_token=unscoped_token), endpoint) auth_user.set_session_from_user(request, user) message = ( _('Switch to project "%(project_name)s" successful.') % {'project_name': request.user.project_name}) messages.success(request, message) response = shortcuts.redirect(redirect_to) utils.set_response_cookie(response, 'recent_project', request.user.project_id) return response
# TODO(stephenfin): Migrate to CBV
[docs]@login_required def switch_region(request, region_name, redirect_field_name=auth.REDIRECT_FIELD_NAME): """Switches the user's region for all services except Identity service. The region will be switched if the given region is one of the regions available for the scoped project. Otherwise the region is not switched. """ if region_name in request.user.available_services_regions: request.session['services_region'] = region_name LOG.debug('Switching services region to %s for user "%s".', region_name, request.user.username) redirect_to = request.GET.get(redirect_field_name, '') if (not http.url_has_allowed_host_and_scheme( url=redirect_to, allowed_hosts=[request.get_host()])): redirect_to = settings.LOGIN_REDIRECT_URL response = shortcuts.redirect(redirect_to) utils.set_response_cookie(response, 'services_region', request.session['services_region']) return response
# TODO(stephenfin): Migrate to CBV
[docs]@login_required def switch_keystone_provider(request, keystone_provider=None, redirect_field_name=auth.REDIRECT_FIELD_NAME): """Switches the user's keystone provider using K2K Federation If keystone_provider is given then we switch the user to the keystone provider using K2K federation. Otherwise if keystone_provider is None then we switch the user back to the Identity Provider Keystone which a non federated token auth will be used. """ base_token = request.session.get('k2k_base_unscoped_token', None) k2k_auth_url = request.session.get('k2k_auth_url', None) keystone_providers = request.session.get('keystone_providers', None) recent_project = request.COOKIES.get('recent_project') if not base_token or not k2k_auth_url: msg = _('K2K Federation not setup for this session') raise exceptions.KeystoneAuthException(msg) redirect_to = request.GET.get(redirect_field_name, '') if (not http.url_has_allowed_host_and_scheme( url=redirect_to, allowed_hosts=[request.get_host()])): redirect_to = settings.LOGIN_REDIRECT_URL unscoped_auth_ref = None keystone_idp_id = settings.KEYSTONE_PROVIDER_IDP_ID if keystone_provider == keystone_idp_id: current_plugin = plugin.TokenPlugin() unscoped_auth = current_plugin.get_plugin(auth_url=k2k_auth_url, token=base_token) else: # Switch to service provider using K2K federation plugins = [plugin.TokenPlugin()] current_plugin = plugin.K2KAuthPlugin() unscoped_auth = current_plugin.get_plugin( auth_url=k2k_auth_url, service_provider=keystone_provider, plugins=plugins, token=base_token, recent_project=recent_project) try: # Switch to identity provider using token auth unscoped_auth_ref = current_plugin.get_access_info(unscoped_auth) except exceptions.KeystoneAuthException as exc: msg = 'Switching to Keystone Provider %s has failed. %s' \ % (keystone_provider, exc) messages.error(request, msg) if unscoped_auth_ref: try: request.user = auth.authenticate( request, auth_url=unscoped_auth.auth_url, token=unscoped_auth_ref.auth_token) except exceptions.KeystoneAuthException as exc: msg = 'Keystone provider switch failed: %s' % exc res = django_http.HttpResponseRedirect(settings.LOGIN_URL) set_logout_reason(res, msg) return res auth.login(request, request.user) auth_user.set_session_from_user(request, request.user) request.session['keystone_provider_id'] = keystone_provider request.session['keystone_providers'] = keystone_providers request.session['k2k_base_unscoped_token'] = base_token request.session['k2k_auth_url'] = k2k_auth_url message = ( _('Switch to Keystone Provider "%(keystone_provider)s" ' 'successful.') % {'keystone_provider': keystone_provider}) messages.success(request, message) response = shortcuts.redirect(redirect_to) return response
# TODO(stephenfin): Migrate to CBV
[docs]@login_required def switch_system_scope(request, redirect_field_name=auth.REDIRECT_FIELD_NAME): """Switches an authenticated user from one system to another.""" LOG.debug('Switching to system scope for user "%s".', request.user.username) endpoint, __ = utils.fix_auth_url_version_prefix(request.user.endpoint) client_ip = utils.get_client_ip(request) session = utils.get_session(original_ip=client_ip) # Keystone can be configured to prevent exchanging a scoped token for # another token. Always use the unscoped token for requesting a # scoped token. unscoped_token = request.user.unscoped_token auth = utils.get_token_auth_plugin(auth_url=endpoint, token=unscoped_token, system_scope='all') try: auth_ref = auth.get_access(session) except keystone_exceptions.ClientException: msg = ( _('System switch failed for user "%(username)s".') % {'username': request.user.username}) messages.error(request, msg) auth_ref = None LOG.exception('An error occurred while switching sessions.') else: msg = 'System switch successful for user "%(username)s".' % \ {'username': request.user.username} LOG.info(msg) # Ensure the user-originating redirection url is safe. # Taken from django.contrib.auth.views.login() redirect_to = request.GET.get(redirect_field_name, '') if (not http.url_has_allowed_host_and_scheme( url=redirect_to, allowed_hosts=[request.get_host()])): redirect_to = settings.LOGIN_REDIRECT_URL if auth_ref: user = auth_user.create_user_from_token( request, auth_user.Token(auth_ref, unscoped_token=unscoped_token), endpoint) auth_user.set_session_from_user(request, user) message = _('Switch to system scope successful.') messages.success(request, message) response = shortcuts.redirect(redirect_to) return response
[docs]class PasswordView(edit_views.FormView): """Changes user's password when it's expired or otherwise inaccessible.""" template_name = 'auth/password.html' form_class = forms.Password success_url = settings.LOGIN_URL
[docs] def get_initial(self): return { 'user_id': self.kwargs['user_id'], 'region': self.request.COOKIES.get('login_region'), }
[docs] def form_valid(self, form): # We have no session here, so regular messages don't work. msg = _('Password changed. Please log in to continue.') res = django_http.HttpResponseRedirect(self.success_url) set_logout_reason(res, msg) return res