django-cas-server/cas_server/models.py

1117 lines
42 KiB
Python

# -*- coding: utf-8 -*-
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License version 3 for
# more details.
#
# You should have received a copy of the GNU General Public License version 3
# along with this program; if not, write to the Free Software Foundation, Inc., 51
# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# (c) 2015-2016 Valentin Samir
"""models for the app"""
from .default_settings import settings, SessionStore
from django.db import models
from django.db.models import Q
from django.contrib import messages
from django.utils.translation import ugettext_lazy as _
from django.utils import timezone
from django.utils.encoding import python_2_unicode_compatible
from django.core.mail import send_mail
import re
import sys
import smtplib
import logging
from datetime import timedelta
from concurrent.futures import ThreadPoolExecutor
from requests_futures.sessions import FuturesSession
from cas_server import utils
from . import VERSION
#: logger facility
logger = logging.getLogger(__name__)
class JsonAttributes(models.Model):
"""
Bases: :class:`django.db.models.Model`
A base class for models storing attributes as a json
"""
class Meta:
abstract = True
#: The attributes json encoded
_attributs = models.TextField(default=None, null=True, blank=True)
@property
def attributs(self):
"""The attributes"""
if self._attributs is not None:
return utils.json.loads(self._attributs)
@attributs.setter
def attributs(self, value):
"""attributs property setter"""
self._attributs = utils.json_encode(value)
@python_2_unicode_compatible
class FederatedIendityProvider(models.Model):
"""
Bases: :class:`django.db.models.Model`
An identity provider for the federated mode
"""
class Meta:
verbose_name = _(u"identity provider")
verbose_name_plural = _(u"identity providers")
#: Suffix append to backend CAS returned username: ``returned_username`` @ ``suffix``.
#: it must be unique.
suffix = models.CharField(
max_length=30,
unique=True,
verbose_name=_(u"suffix"),
help_text=_(
u"Suffix append to backend CAS returned "
u"username: ``returned_username`` @ ``suffix``."
)
)
#: URL to the root of the CAS server application. If login page is
#: https://cas.example.net/cas/login then :attr:`server_url` should be
#: https://cas.example.net/cas/
server_url = models.CharField(max_length=255, verbose_name=_(u"server url"))
#: Version of the CAS protocol to use when sending requests the the backend CAS.
cas_protocol_version = models.CharField(
max_length=30,
choices=[
("1", "CAS 1.0"),
("2", "CAS 2.0"),
("3", "CAS 3.0"),
("CAS_2_SAML_1_0", "SAML 1.1")
],
verbose_name=_(u"CAS protocol version"),
help_text=_(
u"Version of the CAS protocol to use when sending requests the the backend CAS."
),
default="3"
)
#: Name for this identity provider displayed on the login page.
verbose_name = models.CharField(
max_length=255,
verbose_name=_(u"verbose name"),
help_text=_(u"Name for this identity provider displayed on the login page.")
)
#: Position of the identity provider on the login page. Identity provider are sorted using the
#: (:attr:`pos`, :attr:`verbose_name`, :attr:`suffix`) attributes.
pos = models.IntegerField(
default=100,
verbose_name=_(u"position"),
help_text=_(
(
u"Position of the identity provider on the login page. "
u"Identity provider are sorted using the "
u"(position, verbose name, suffix) attributes."
)
)
)
#: Display the provider on the login page. Beware that this do not disable the identity
#: provider, it just hide it on the login page. User will always be able to log in using this
#: provider by fetching ``/federate/suffix``.
display = models.BooleanField(
default=True,
verbose_name=_(u"display"),
help_text=_("Display the provider on the login page.")
)
def __str__(self):
return self.verbose_name
@staticmethod
def build_username_from_suffix(username, suffix):
"""
Transform backend username into federated username using ``suffix``
:param unicode username: A CAS backend returned username
:param unicode suffix: A suffix identifying the CAS backend
:return: The federated username: ``username`` @ ``suffix``.
:rtype: unicode
"""
return u'%s@%s' % (username, suffix)
def build_username(self, username):
"""
Transform backend username into federated username
:param unicode username: A CAS backend returned username
:return: The federated username: ``username`` @ :attr:`suffix`.
:rtype: unicode
"""
return u'%s@%s' % (username, self.suffix)
@python_2_unicode_compatible
class FederatedUser(JsonAttributes):
"""
Bases: :class:`JsonAttributes`
A federated user as returner by a CAS provider (username and attributes)
"""
class Meta:
unique_together = ("username", "provider")
verbose_name = _("Federated user")
verbose_name_plural = _("Federated users")
#: The user username returned by the CAS backend on successful ticket validation
username = models.CharField(max_length=124)
#: A foreign key to :class:`FederatedIendityProvider`
provider = models.ForeignKey(FederatedIendityProvider, on_delete=models.CASCADE)
#: The last ticket used to authenticate :attr:`username` against :attr:`provider`
ticket = models.CharField(max_length=255)
#: Last update timespampt. Usually, the last time :attr:`ticket` has been set.
last_update = models.DateTimeField(auto_now=True)
def __str__(self):
return self.federated_username
@property
def federated_username(self):
"""The federated username with a suffix for the current :class:`FederatedUser`."""
return self.provider.build_username(self.username)
@classmethod
def get_from_federated_username(cls, username):
"""
:return: A :class:`FederatedUser` object from a federated ``username``
:rtype: :class:`FederatedUser`
"""
if username is None:
raise cls.DoesNotExist()
else:
component = username.split('@')
username = '@'.join(component[:-1])
suffix = component[-1]
try:
provider = FederatedIendityProvider.objects.get(suffix=suffix)
return cls.objects.get(username=username, provider=provider)
except FederatedIendityProvider.DoesNotExist:
raise cls.DoesNotExist()
@classmethod
def clean_old_entries(cls):
"""remove old unused :class:`FederatedUser`"""
federated_users = cls.objects.filter(
last_update__lt=(timezone.now() - timedelta(seconds=settings.CAS_TICKET_TIMEOUT))
)
known_users = {user.username for user in User.objects.all()}
for user in federated_users:
if user.federated_username not in known_users:
user.delete()
class FederateSLO(models.Model):
"""
Bases: :class:`django.db.models.Model`
An association between a CAS provider ticket and a (username, session) for processing SLO
"""
class Meta:
unique_together = ("username", "session_key", "ticket")
#: the federated username with the ``@``component
username = models.CharField(max_length=30)
#: the session key for the session :attr:`username` has been authenticated using :attr:`ticket`
session_key = models.CharField(max_length=40, blank=True, null=True)
#: The ticket used to authenticate :attr:`username`
ticket = models.CharField(max_length=255, db_index=True)
@classmethod
def clean_deleted_sessions(cls):
"""remove old :class:`FederateSLO` object for which the session do not exists anymore"""
for federate_slo in cls.objects.all():
if not SessionStore(session_key=federate_slo.session_key).get('authenticated'):
federate_slo.delete()
@python_2_unicode_compatible
class UserAttributes(JsonAttributes):
"""
Bases: :class:`JsonAttributes`
Local cache of the user attributes, used then needed
"""
class Meta:
verbose_name = _("User attributes cache")
verbose_name_plural = _("User attributes caches")
#: The username of the user for which we cache attributes
username = models.CharField(max_length=155, unique=True)
def __str__(self):
return self.username
@classmethod
def clean_old_entries(cls):
"""Remove :class:`UserAttributes` for which no more :class:`User` exists."""
for user in cls.objects.all():
if User.objects.filter(username=user.username).count() == 0:
user.delete()
@python_2_unicode_compatible
class User(models.Model):
"""
Bases: :class:`django.db.models.Model`
A user logged into the CAS
"""
class Meta:
unique_together = ("username", "session_key")
verbose_name = _("User")
verbose_name_plural = _("Users")
#: The session key of the current authenticated user
session_key = models.CharField(max_length=40, blank=True, null=True)
#: The username of the current authenticated user
username = models.CharField(max_length=250)
#: Last time the authenticated user has do something (auth, fetch ticket, etc…)
date = models.DateTimeField(auto_now=True)
#: last time the user logged
last_login = models.DateTimeField(auto_now_add=True)
def delete(self, *args, **kwargs):
"""
Remove the current :class:`User`. If ``settings.CAS_FEDERATE`` is ``True``, also delete
the corresponding :class:`FederateSLO` object.
"""
if settings.CAS_FEDERATE:
FederateSLO.objects.filter(
username=self.username,
session_key=self.session_key
).delete()
super(User, self).delete(*args, **kwargs)
@classmethod
def clean_old_entries(cls):
"""
Remove :class:`User` objects inactive since more that
:django:setting:`SESSION_COOKIE_AGE` and send corresponding SingleLogOut requests.
"""
filter = Q(date__lt=(timezone.now() - timedelta(seconds=settings.SESSION_COOKIE_AGE)))
if settings.CAS_TGT_VALIDITY is not None:
filter |= Q(
last_login__lt=(timezone.now() - timedelta(seconds=settings.CAS_TGT_VALIDITY))
)
users = cls.objects.filter(filter)
for user in users:
user.logout()
users.delete()
@classmethod
def clean_deleted_sessions(cls):
"""Remove :class:`User` objects where the corresponding session do not exists anymore."""
for user in cls.objects.all():
if not SessionStore(session_key=user.session_key).get('authenticated'):
user.logout()
user.delete()
@property
def attributs(self):
"""
Property.
A fresh :class:`dict` for the user attributes, using ``settings.CAS_AUTH_CLASS`` if
possible, and if not, try to fallback to cached attributes (actually only used for ldap
auth class with bind password check mthode).
"""
try:
return utils.import_attr(settings.CAS_AUTH_CLASS)(self.username).attributs()
except NotImplementedError:
try:
user = UserAttributes.objects.get(username=self.username)
attributes = user.attributs
if attributes is not None:
return attributes
else:
return {}
except UserAttributes.DoesNotExist:
return {}
def __str__(self):
return u"%s - %s" % (self.username, self.session_key)
def logout(self, request=None):
"""
Send SLO requests to all services the user is logged in.
:param request: The current django HttpRequest to display possible failure to the user.
:type request: :class:`django.http.HttpRequest` or :obj:`NoneType<types.NoneType>`
"""
ticket_classes = [ProxyGrantingTicket, ServiceTicket, ProxyTicket]
for error in Ticket.send_slos(
[ticket_class.objects.filter(user=self) for ticket_class in ticket_classes]
):
logger.warning(
"Error during SLO for user %s: %s" % (
self.username,
error
)
)
if request is not None:
error = utils.unpack_nested_exception(error)
messages.add_message(
request,
messages.WARNING,
_(u'Error during service logout %s') % error
)
def get_ticket(self, ticket_class, service, service_pattern, renew):
"""
Generate a ticket using ``ticket_class`` for the service
``service`` matching ``service_pattern`` and asking or not for
authentication renewal with ``renew``
:param type ticket_class: :class:`ServiceTicket` or :class:`ProxyTicket` or
:class:`ProxyGrantingTicket`.
:param unicode service: The service url for which we want a ticket.
:param ServicePattern service_pattern: The service pattern matching ``service``.
Beware that ``service`` must match :attr:`ServicePattern.pattern` and the current
:class:`User` must pass :meth:`ServicePattern.check_user`. These checks are not done
here and you must perform them before calling this method.
:param bool renew: Should be ``True`` if authentication has been renewed. Must be
``False`` otherwise.
:return: A :class:`Ticket` object.
:rtype: :class:`ServiceTicket` or :class:`ProxyTicket` or
:class:`ProxyGrantingTicket`.
"""
attributs = dict(
(a.name, a.replace if a.replace else a.name) for a in service_pattern.attributs.all()
)
replacements = dict(
(a.attribut, (a.pattern, a.replace)) for a in service_pattern.replacements.all()
)
service_attributs = {}
for (key, value) in self.attributs.items():
if key in attributs or '*' in attributs:
if key in replacements:
if isinstance(value, list):
for index, subval in enumerate(value):
value[index] = re.sub(
replacements[key][0],
replacements[key][1],
subval
)
else:
value = re.sub(replacements[key][0], replacements[key][1], value)
service_attributs[attributs.get(key, key)] = value
ticket = ticket_class.objects.create(
user=self,
attributs=service_attributs,
service=service,
renew=renew,
service_pattern=service_pattern,
single_log_out=service_pattern.single_log_out
)
ticket.save()
self.save()
return ticket
def get_service_url(self, service, service_pattern, renew):
"""
Return the url to which the user must be redirected to
after a Service Ticket has been generated
:param unicode service: The service url for which we want a ticket.
:param ServicePattern service_pattern: The service pattern matching ``service``.
Beware that ``service`` must match :attr:`ServicePattern.pattern` and the current
:class:`User` must pass :meth:`ServicePattern.check_user`. These checks are not done
here and you must perform them before calling this method.
:param bool renew: Should be ``True`` if authentication has been renewed. Must be
``False`` otherwise.
:return unicode: The service url with the ticket GET param added.
:rtype: unicode
"""
ticket = self.get_ticket(ServiceTicket, service, service_pattern, renew)
url = utils.update_url(service, {'ticket': ticket.value})
logger.info("Service ticket created for service %s by user %s." % (service, self.username))
return url
class ServicePatternException(Exception):
"""
Bases: :class:`exceptions.Exception`
Base exception of exceptions raised in the ServicePattern model"""
pass
class BadUsername(ServicePatternException):
"""
Bases: :class:`ServicePatternException`
Exception raised then an non allowed username try to get a ticket for a service
"""
pass
class BadFilter(ServicePatternException):
"""
Bases: :class:`ServicePatternException`
Exception raised then a user try to get a ticket for a service and do not reach a condition
"""
pass
class UserFieldNotDefined(ServicePatternException):
"""
Bases: :class:`ServicePatternException`
Exception raised then a user try to get a ticket for a service using as username
an attribut not present on this user
"""
pass
@python_2_unicode_compatible
class ServicePattern(models.Model):
"""
Bases: :class:`django.db.models.Model`
Allowed services pattern against services are tested to
"""
class Meta:
ordering = ("pos", )
verbose_name = _("Service pattern")
verbose_name_plural = _("Services patterns")
#: service patterns are sorted using the :attr:`pos` attribute
pos = models.IntegerField(
default=100,
verbose_name=_(u"position"),
help_text=_(u"service patterns are sorted using the position attribute")
)
#: A name for the service (this can bedisplayed to the user on the login page)
name = models.CharField(
max_length=255,
unique=True,
blank=True,
null=True,
verbose_name=_(u"name"),
help_text=_(u"A name for the service")
)
#: A regular expression matching services. "Will usually looks like
#: '^https://some\\.server\\.com/path/.*$'. As it is a regular expression, special character
#: must be escaped with a '\\'.
pattern = models.CharField(
max_length=255,
unique=True,
verbose_name=_(u"pattern"),
help_text=_(
"A regular expression matching services. "
"Will usually looks like '^https://some\\.server\\.com/path/.*$'."
"As it is a regular expression, special character must be escaped with a '\\'."
),
validators=[utils.regexpr_validator]
)
#: Name of the attribute to transmit as username, if empty the user login is used
user_field = models.CharField(
max_length=255,
default="",
blank=True,
verbose_name=_(u"user field"),
help_text=_("Name of the attribute to transmit as username, empty = login")
)
#: A boolean allowing to limit username allowed to connect to :attr:`usernames`.
restrict_users = models.BooleanField(
default=False,
verbose_name=_(u"restrict username"),
help_text=_("Limit username allowed to connect to the list provided bellow")
)
#: A boolean allowing to deliver :class:`ProxyTicket` to the service.
proxy = models.BooleanField(
default=False,
verbose_name=_(u"proxy"),
help_text=_("Proxy tickets can be delivered to the service")
)
#: A boolean allowing the service to be used as a proxy callback (via the pgtUrl GET param)
#: to deliver :class:`ProxyGrantingTicket`.
proxy_callback = models.BooleanField(
default=False,
verbose_name=_(u"proxy callback"),
help_text=_("can be used as a proxy callback to deliver PGT")
)
#: Enable SingleLogOut for the service. Old validaed tickets for the service will be kept
#: until ``settings.CAS_TICKET_TIMEOUT`` after what a SLO request is send to the service and
#: the ticket is purged from database. A SLO can be send earlier if the user log-out.
single_log_out = models.BooleanField(
default=False,
verbose_name=_(u"single log out"),
help_text=_("Enable SLO for the service")
)
#: An URL where the SLO request will be POST. If empty the service url will be used.
#: This is usefull for non HTTP proxied services like smtp or imap.
single_log_out_callback = models.CharField(
max_length=255,
default="",
blank=True,
verbose_name=_(u"single log out callback"),
help_text=_(u"URL where the SLO request will be POST. empty = service url\n"
u"This is usefull for non HTTP proxied services.")
)
def __str__(self):
return u"%s: %s" % (self.pos, self.pattern)
def check_user(self, user):
"""
Check if ``user`` if allowed to use theses services. If ``user`` is not allowed,
raises one of :class:`BadFilter`, :class:`UserFieldNotDefined`, :class:`BadUsername`
:param User user: a :class:`User` object
:raises BadUsername: if :attr:`restrict_users` if ``True`` and :attr:`User.username`
is not within :attr:`usernames`.
:raises BadFilter: if a :class:`FilterAttributValue` condition of :attr:`filters`
connot be verified.
:raises UserFieldNotDefined: if :attr:`user_field` is defined and its value is not
within :attr:`User.attributs`.
:return: ``True``
:rtype: bool
"""
if self.restrict_users and not self.usernames.filter(value=user.username):
logger.warning("Username %s not allowed on service %s" % (user.username, self.name))
raise BadUsername()
for filtre in self.filters.all():
if isinstance(user.attributs.get(filtre.attribut, []), list):
attrs = user.attributs.get(filtre.attribut, [])
else:
attrs = [user.attributs[filtre.attribut]]
for value in attrs:
if re.match(filtre.pattern, str(value)):
break
else:
bad_filter = (filtre.pattern, filtre.attribut, user.attributs.get(filtre.attribut))
logger.warning(
"User constraint failed for %s, service %s: %s do not match %s %s." % (
(user.username, self.name) + bad_filter
)
)
raise BadFilter('%s do not match %s %s' % bad_filter)
if self.user_field and not user.attributs.get(self.user_field):
logger.warning(
"Cannot use %s a loggin for user %s on service %s because it is absent" % (
self.user_field,
user.username,
self.name
)
)
raise UserFieldNotDefined()
return True
@classmethod
def validate(cls, service):
"""
Get a :class:`ServicePattern` intance from a service url.
:param unicode service: A service url
:return: A :class:`ServicePattern` instance matching ``service``.
:rtype: :class:`ServicePattern`
:raises ServicePattern.DoesNotExist: if no :class:`ServicePattern` is matching
``service``.
"""
for service_pattern in cls.objects.all().order_by('pos'):
if re.match(service_pattern.pattern, service):
return service_pattern
logger.warning("Service %s not allowed." % service)
raise cls.DoesNotExist()
@python_2_unicode_compatible
class Username(models.Model):
"""
Bases: :class:`django.db.models.Model`
A list of allowed usernames on a :class:`ServicePattern`
"""
#: username allowed to connect to the service
value = models.CharField(
max_length=255,
verbose_name=_(u"username"),
help_text=_(u"username allowed to connect to the service")
)
#: ForeignKey to a :class:`ServicePattern`. :class:`Username` instances for a
#: :class:`ServicePattern` are accessible thought its :attr:`ServicePattern.usernames`
#: attribute.
service_pattern = models.ForeignKey(
ServicePattern,
related_name="usernames",
on_delete=models.CASCADE
)
def __str__(self):
return self.value
@python_2_unicode_compatible
class ReplaceAttributName(models.Model):
"""
Bases: :class:`django.db.models.Model`
A replacement of an attribute name for a :class:`ServicePattern`. It also tell to transmit
an attribute of :attr:`User.attributs` to the service. An empty :attr:`replace` mean
to use the original attribute name.
"""
class Meta:
unique_together = ('name', 'replace', 'service_pattern')
#: Name the attribute: a key of :attr:`User.attributs`
name = models.CharField(
max_length=255,
verbose_name=_(u"name"),
help_text=_(u"name of an attribute to send to the service, use * for all attributes")
)
#: The name of the attribute to transmit to the service. If empty, the value of :attr:`name`
#: is used.
replace = models.CharField(
max_length=255,
blank=True,
verbose_name=_(u"replace"),
help_text=_(u"name under which the attribute will be show "
u"to the service. empty = default name of the attribut")
)
#: ForeignKey to a :class:`ServicePattern`. :class:`ReplaceAttributName` instances for a
#: :class:`ServicePattern` are accessible thought its :attr:`ServicePattern.attributs`
#: attribute.
service_pattern = models.ForeignKey(
ServicePattern,
related_name="attributs",
on_delete=models.CASCADE
)
def __str__(self):
if not self.replace:
return self.name
else:
return u"%s%s" % (self.name, self.replace)
@python_2_unicode_compatible
class FilterAttributValue(models.Model):
"""
Bases: :class:`django.db.models.Model`
A filter on :attr:`User.attributs` for a :class:`ServicePattern`. If a :class:`User` do not
have an attribute :attr:`attribut` or its value do not match :attr:`pattern`, then
:meth:`ServicePattern.check_user` will raises :class:`BadFilter` if called with that user.
"""
#: The name of a user attribute
attribut = models.CharField(
max_length=255,
verbose_name=_(u"attribute"),
help_text=_(u"Name of the attribute which must verify pattern")
)
#: A regular expression the attribute :attr:`attribut` value must verify. If :attr:`attribut`
#: if a list, only one of the list values needs to match.
pattern = models.CharField(
max_length=255,
verbose_name=_(u"pattern"),
help_text=_(u"a regular expression"),
validators=[utils.regexpr_validator]
)
#: ForeignKey to a :class:`ServicePattern`. :class:`FilterAttributValue` instances for a
#: :class:`ServicePattern` are accessible thought its :attr:`ServicePattern.filters`
#: attribute.
service_pattern = models.ForeignKey(
ServicePattern,
related_name="filters",
on_delete=models.CASCADE
)
def __str__(self):
return u"%s %s" % (self.attribut, self.pattern)
@python_2_unicode_compatible
class ReplaceAttributValue(models.Model):
"""
Bases: :class:`django.db.models.Model`
A replacement (using a regular expression) of an attribute value for a
:class:`ServicePattern`.
"""
#: Name the attribute: a key of :attr:`User.attributs`
attribut = models.CharField(
max_length=255,
verbose_name=_(u"attribute"),
help_text=_(u"Name of the attribute for which the value must be replace")
)
#: A regular expression matching the part of the attribute value that need to be changed
pattern = models.CharField(
max_length=255,
verbose_name=_(u"pattern"),
help_text=_(u"An regular expression maching whats need to be replaced"),
validators=[utils.regexpr_validator]
)
#: The replacement to what is mached by :attr:`pattern`. groups are capture by \\1, \\2 …
replace = models.CharField(
max_length=255,
blank=True,
verbose_name=_(u"replace"),
help_text=_(u"replace expression, groups are capture by \\1, \\2 …")
)
#: ForeignKey to a :class:`ServicePattern`. :class:`ReplaceAttributValue` instances for a
#: :class:`ServicePattern` are accessible thought its :attr:`ServicePattern.replacements`
#: attribute.
service_pattern = models.ForeignKey(
ServicePattern,
related_name="replacements",
on_delete=models.CASCADE
)
def __str__(self):
return u"%s %s %s" % (self.attribut, self.pattern, self.replace)
@python_2_unicode_compatible
class Ticket(JsonAttributes):
"""
Bases: :class:`JsonAttributes`
Generic class for a Ticket
"""
class Meta:
abstract = True
#: ForeignKey to a :class:`User`.
user = models.ForeignKey(User, related_name="%(class)s", on_delete=models.CASCADE)
#: A boolean. ``True`` if the ticket has been validated
validate = models.BooleanField(default=False)
#: The service url for the ticket
service = models.TextField()
#: ForeignKey to a :class:`ServicePattern`. The :class:`ServicePattern` corresponding to
#: :attr:`service`. Use :meth:`ServicePattern.validate` to find it.
service_pattern = models.ForeignKey(
ServicePattern,
related_name="%(class)s",
on_delete=models.CASCADE
)
#: Date of the ticket creation
creation = models.DateTimeField(auto_now_add=True)
#: A boolean. ``True`` if the user has just renew his authentication
renew = models.BooleanField(default=False)
#: A boolean. Set to :attr:`service_pattern` attribute
#: :attr:`ServicePattern.single_log_out` value.
single_log_out = models.BooleanField(default=False)
#: Max duration between ticket creation and its validation. Any validation attempt for the
#: ticket after :attr:`creation` + VALIDITY will fail as if the ticket do not exists.
VALIDITY = settings.CAS_TICKET_VALIDITY
#: Time we keep ticket with :attr:`single_log_out` set to ``True`` before sending SingleLogOut
#: requests.
TIMEOUT = settings.CAS_TICKET_TIMEOUT
class DoesNotExist(Exception):
"""raised in :meth:`Ticket.get` then ticket prefix and ticket classes mismatch"""
pass
def __str__(self):
return u"Ticket-%s" % self.pk
@staticmethod
def send_slos(queryset_list):
"""
Send SLO requests to each ticket of each queryset of ``queryset_list``
:param list queryset_list: A list a :class:`Ticket` queryset
:return: A list of possibly encoutered :class:`Exception`
:rtype: list
"""
# sending SLO to timed-out validated tickets
async_list = []
session = FuturesSession(
executor=ThreadPoolExecutor(max_workers=settings.CAS_SLO_MAX_PARALLEL_REQUESTS)
)
errors = []
for queryset in queryset_list:
for ticket in queryset:
ticket.logout(session, async_list)
queryset.delete()
for future in async_list:
if future: # pragma: no branch (should always be true)
try:
future.result()
except Exception as error:
errors.append(error)
return errors
@classmethod
def clean_old_entries(cls):
"""Remove old ticket and send SLO to timed-out services"""
# removing old validated ticket and non validated expired tickets
cls.objects.filter(
(
Q(single_log_out=False) & Q(validate=True)
) | (
Q(validate=False) &
Q(creation__lt=(timezone.now() - timedelta(seconds=cls.VALIDITY)))
)
).delete()
queryset = cls.objects.filter(
creation__lt=(timezone.now() - timedelta(seconds=cls.TIMEOUT))
)
for error in cls.send_slos([queryset]):
logger.warning("Error durring SLO %s" % error)
sys.stderr.write("%r\n" % error)
def logout(self, session, async_list=None):
"""Send a SLO request to the ticket service"""
# On logout invalidate the Ticket
self.validate = True
self.save()
if self.validate and self.single_log_out: # pragma: no branch (should always be true)
logger.info(
"Sending SLO requests to service %s for user %s" % (
self.service,
self.user.username
)
)
xml = utils.logout_request(self.value)
if self.service_pattern.single_log_out_callback:
url = self.service_pattern.single_log_out_callback
else:
url = self.service
async_list.append(
session.post(
url.encode('utf-8'),
data={'logoutRequest': xml.encode('utf-8')},
timeout=settings.CAS_SLO_TIMEOUT
)
)
@staticmethod
def get_class(ticket, classes=None):
"""
Return the ticket class of ``ticket``
:param unicode ticket: A ticket
:param list classes: Optinal arguement. A list of possible :class:`Ticket` subclasses
:return: The class corresponding to ``ticket`` (:class:`ServiceTicket` or
:class:`ProxyTicket` or :class:`ProxyGrantingTicket`) if found among ``classes,
``None`` otherwise.
:rtype: :obj:`type` or :obj:`NoneType<types.NoneType>`
"""
if classes is None: # pragma: no cover (not used)
classes = [ServiceTicket, ProxyTicket, ProxyGrantingTicket]
for ticket_class in classes:
if ticket.startswith(ticket_class.PREFIX):
return ticket_class
def username(self):
"""
The username to send on ticket validation
:return: The value of the corresponding user attribute if
:attr:`service_pattern`.user_field is set, the user username otherwise.
"""
if self.service_pattern.user_field and self.user.attributs.get(
self.service_pattern.user_field
):
username = self.user.attributs[self.service_pattern.user_field]
if isinstance(username, list):
# the list is not empty because we wont generate a ticket with a user_field
# that evaluate to False
username = username[0]
else:
username = self.user.username
return username
def attributs_flat(self):
"""
generate attributes list for template rendering
:return: An list of (attribute name, attribute value) of all user attributes flatened
(no nested list)
:rtype: :obj:`list` of :obj:`tuple` of :obj:`unicode`
"""
attributes = []
for key, value in self.attributs.items():
if isinstance(value, list):
for elt in value:
attributes.append((key, elt))
else:
attributes.append((key, value))
return attributes
@classmethod
def get(cls, ticket, renew=False, service=None):
"""
Search the database for a valid ticket with provided arguments
:param unicode ticket: A ticket value
:param bool renew: Is authentication renewal needed
:param unicode service: Optional argument. The ticket service
:raises Ticket.DoesNotExist: if no class is found for the ticket prefix
:raises cls.DoesNotExist: if ``ticket`` value is not found in th database
:return: a :class:`Ticket` instance
:rtype: Ticket
"""
# If the method class is the ticket abstract class, search for the submited ticket
# class using its prefix. Assuming ticket is a ProxyTicket or a ServiceTicket
if cls == Ticket:
ticket_class = cls.get_class(ticket, classes=[ServiceTicket, ProxyTicket])
# else use the method class
else:
ticket_class = cls
# If ticket prefix is wrong, raise DoesNotExist
if cls != Ticket and not ticket.startswith(cls.PREFIX):
raise Ticket.DoesNotExist()
if ticket_class:
# search for the ticket that is not yet validated and is still valid
ticket_queryset = ticket_class.objects.filter(
value=ticket,
validate=False,
creation__gt=(timezone.now() - timedelta(seconds=ticket_class.VALIDITY))
)
# if service is specified, add it the the queryset
if service is not None:
ticket_queryset = ticket_queryset.filter(service=service)
# only require renew if renew is True, otherwise it do not matter if renew is True
# or False.
if renew:
ticket_queryset = ticket_queryset.filter(renew=True)
# fetch the ticket ``MultipleObjectsReturned`` is never raised as the ticket value
# is unique across the database
ticket = ticket_queryset.get()
# For ServiceTicket and Proxyticket, mark it as validated before returning
if ticket_class != ProxyGrantingTicket:
ticket.validate = True
ticket.save()
return ticket
# If no class found for the ticket, raise DoesNotExist
else:
raise Ticket.DoesNotExist()
@python_2_unicode_compatible
class ServiceTicket(Ticket):
"""
Bases: :class:`Ticket`
A Service Ticket
"""
#: The ticket prefix used to differentiate it from other tickets types
PREFIX = settings.CAS_SERVICE_TICKET_PREFIX
#: The ticket value
value = models.CharField(max_length=255, default=utils.gen_st, unique=True)
def __str__(self):
return u"ServiceTicket-%s" % self.pk
@python_2_unicode_compatible
class ProxyTicket(Ticket):
"""
Bases: :class:`Ticket`
A Proxy Ticket
"""
#: The ticket prefix used to differentiate it from other tickets types
PREFIX = settings.CAS_PROXY_TICKET_PREFIX
#: The ticket value
value = models.CharField(max_length=255, default=utils.gen_pt, unique=True)
def __str__(self):
return u"ProxyTicket-%s" % self.pk
@python_2_unicode_compatible
class ProxyGrantingTicket(Ticket):
"""
Bases: :class:`Ticket`
A Proxy Granting Ticket
"""
#: The ticket prefix used to differentiate it from other tickets types
PREFIX = settings.CAS_PROXY_GRANTING_TICKET_PREFIX
#: ProxyGranting ticket are never validated. However, they can be used during :attr:`VALIDITY`
#: to get :class:`ProxyTicket` for :attr:`user`
VALIDITY = settings.CAS_PGT_VALIDITY
#: The ticket value
value = models.CharField(max_length=255, default=utils.gen_pgt, unique=True)
def __str__(self):
return u"ProxyGrantingTicket-%s" % self.pk
@python_2_unicode_compatible
class Proxy(models.Model):
"""
Bases: :class:`django.db.models.Model`
A list of proxies on :class:`ProxyTicket`
"""
class Meta:
ordering = ("-pk", )
#: Service url of the PGT used for getting the associated :class:`ProxyTicket`
url = models.CharField(max_length=255)
#: ForeignKey to a :class:`ProxyTicket`. :class:`Proxy` instances for a
#: :class:`ProxyTicket` are accessible thought its :attr:`ProxyTicket.proxies`
#: attribute.
proxy_ticket = models.ForeignKey(ProxyTicket, related_name="proxies", on_delete=models.CASCADE)
def __str__(self):
return self.url
class NewVersionWarning(models.Model):
"""
Bases: :class:`django.db.models.Model`
The last new version available version sent
"""
version = models.CharField(max_length=255)
@classmethod
def send_mails(cls):
"""
For each new django-cas-server version, if the current instance is not up to date
send one mail to ``settings.ADMINS``.
"""
if settings.CAS_NEW_VERSION_EMAIL_WARNING and settings.ADMINS:
try:
obj = cls.objects.get()
except cls.DoesNotExist:
obj = NewVersionWarning.objects.create(version=VERSION)
LAST_VERSION = utils.last_version()
if LAST_VERSION is not None and LAST_VERSION != obj.version:
if utils.decode_version(VERSION) < utils.decode_version(LAST_VERSION):
try:
send_mail(
(
'%sA new version of django-cas-server is available'
) % settings.EMAIL_SUBJECT_PREFIX,
u'''
A new version of the django-cas-server is available.
Your version: %s
New version: %s
Upgrade using:
* pip install -U django-cas-server
* fetching the last release on
https://github.com/nitmir/django-cas-server/ or on
https://pypi.org/project/django-cas-server/
After upgrade, do not forget to run:
* ./manage.py migrate
* ./manage.py collectstatic
and to reload your wsgi server (apache2, uwsgi, gunicord, etc…)
--\u0020
django-cas-server
'''.strip() % (VERSION, LAST_VERSION),
settings.SERVER_EMAIL,
["%s <%s>" % admin for admin in settings.ADMINS],
fail_silently=False,
)
obj.version = LAST_VERSION
obj.save()
except smtplib.SMTPException as error: # pragma: no cover (should not happen)
logger.error("Unable to send new version mail: %s" % error)