django-cas-server/cas_server/models.py

206 lines
8.9 KiB
Python

# ⁻*- coding: utf-8 -*-
import default_settings
from django.conf import settings
from django.db import models
from django.contrib import messages
from picklefield.fields import PickledObjectField
from django.utils.translation import ugettext as _
import re
import os
import time
import random
import string
from concurrent.futures import ThreadPoolExecutor
from requests_futures.sessions import FuturesSession
import utils
def _gen_ticket(prefix):
return '%s-%s' % (prefix, ''.join(random.choice(string.ascii_letters + string.digits) for _ in range(settings.CAS_ST_LEN)))
def _gen_st():
return _gen_ticket('ST')
def _gen_pt():
return _gen_ticket('PT')
def _gen_pgt():
return _gen_ticket('PGT')
class User(models.Model):
username = models.CharField(max_length=30, unique=True)
attributs = PickledObjectField()
date = models.DateTimeField(auto_now_add=True, auto_now=True)
def __unicode__(self):
return self.username
def logout(self, request):
async_list = []
session = FuturesSession(executor=ThreadPoolExecutor(max_workers=10))
for ticket in ServiceTicket.objects.filter(user=self):
async_list.append(ticket.logout(request, session))
ticket.delete()
for ticket in ProxyTicket.objects.filter(user=self):
async_list.append(ticket.logout(request, session))
ticket.delete()
for ticket in ProxyGrantingTicket.objects.filter(user=self):
async_list.append(ticket.logout(request, session))
ticket.delete()
for future in async_list:
try:
future.result()
except Exception as e:
messages.add_message(request, messages.WARNING, _(u'Error during service logout %s') % e)
def delete(self):
super(User, self).delete()
def get_ticket(self, TicketClass, service, service_pattern, renew):
attributs = dict((a.name, a.replace if a.replace else a.name) for a in service_pattern.attributs.all())
replacements = dict((a.name, (a.pattern, a.replace)) for a in service_pattern.replacements.all())
service_attributs = {}
for (k,v) in self.attributs.items():
if k in attributs:
if k in replacements:
v = re.sub(replacements[k][0], replacements[k][1], v)
service_attributs[attributs[k]] = v
ticket = TicketClass.objects.create(user=self, attributs = service_attributs, service=service, renew=renew, service_pattern=service_pattern)
ticket.save()
return ticket
def get_service_url(self, service, service_pattern, renew):
ticket = self.get_ticket(ServiceTicket, service, service_pattern, renew)
url = utils.update_url(service, {'ticket':ticket.value})
return url
class BadUsername(Exception):
pass
class BadFilter(Exception):
pass
class UserFieldNotDefined(Exception):
pass
class ServicePattern(models.Model):
class Meta:
ordering = ("pos", )
pos = models.IntegerField(default=100)
name = models.CharField(max_length=255, unique=True, blank=True, null=True, help_text="Un nom pour le service")
pattern = models.CharField(max_length=255, unique=True)
user_field = models.CharField(max_length=255, default="", blank=True, help_text="Nom de l'attribut transmit comme username, vide = login")
#usernames = models.CharField(max_length=255, default="", blank=True, help_text="Liste d'utilisateurs acceptés séparé par des virgules, vide = tous les utilisateur")
#attributs = models.CharField(max_length=255, default="", blank=True, help_text="Liste des nom d'attributs à transmettre au service, séparé par une virgule. vide = aucun")
restrict_users = models.BooleanField(default=False, help_text="Limiter les utilisateur autorisé a se connecté a ce service à celle ci-dessous")
proxy = models.BooleanField(default=False, help_text="Un ProxyGrantingTicket peut être délivré au service pour s'authentifier en temps que l'utilisateur sur d'autres services")
#filter = models.CharField(max_length=255, default="", blank=True, help_text="Une lambda fonction pour filtrer sur les utilisateur où leurs attribut, arg1: username, arg2:attrs_dict. vide = pas de filtre")
def __unicode__(self):
return u"%s: %s" % (self.pos, self.pattern)
def check_user(self, user):
if self.restrict_users and not self.usernames.filter(value=user.username):
raise BadUsername()
for f in self.filters.all():
if isinstance(user.attributs[f.attribut], list):
l = user.attributs[f.attribut]
else:
l = [user.attributs[f.attribut]]
for v in l:
if re.match(f.pattern, str(v)):
break
else:
raise BadFilter('%s do not match %s %s' % (f.pattern, f.attribut, user.attributs[f.attribut]) )
if self.user_field and not user.attributs.get(self.user_field):
raise UserFieldNotDefined()
return True
@classmethod
def validate(cls, service):
for s in cls.objects.all().order_by('pos'):
if re.match(s.pattern, service):
return s
raise cls.DoesNotExist()
class Usernames(models.Model):
value = models.CharField(max_length=255)
service_pattern = models.ForeignKey(ServicePattern, related_name="usernames")
class ReplaceAttributName(models.Model):
class Meta:
unique_together = ('name', 'replace', 'service_pattern')
name = models.CharField(max_length=255, help_text=u"nom d'un attributs à transmettre au service")
replace = models.CharField(max_length=255, blank=True, help_text=u"nom sous lequel l'attribut sera présenté au service. vide = inchangé")
service_pattern = models.ForeignKey(ServicePattern, related_name="attributs")
def __unicode__(self):
if not self.replace:
return self.name
else:
return u"%s%s" % (self.name, self.replace)
class FilterAttributValue(models.Model):
attribut = models.CharField(max_length=255, help_text=u"Nom de l'attribut devant vérifier pattern")
pattern = models.CharField(max_length=255, help_text=u"Une expression régulière")
service_pattern = models.ForeignKey(ServicePattern, related_name="filters")
def __unicode__(self):
return u"%s %s" % (self.attribut, self.pattern)
class ReplaceAttributValue(models.Model):
attribut = models.CharField(max_length=255, help_text=u"Nom de l'attribut dont la valeur doit être modifié")
pattern = models.CharField(max_length=255, help_text=u"Une expression régulière de ce qui doit être modifié")
replace = models.CharField(max_length=255, blank=True, help_text=u"Par quoi le remplacer, les groupes sont capturé par \\1, \\2 …")
service_pattern = models.ForeignKey(ServicePattern, related_name="replacements")
def __unicode__(self):
return u"%s %s %s" % (self.attribut, self.pattern, self.replace)
class Ticket(models.Model):
class Meta:
abstract = True
user = models.ForeignKey(User, related_name="%(class)s")
attributs = PickledObjectField()
validate = models.BooleanField(default=False)
service = models.TextField()
service_pattern = models.ForeignKey(ServicePattern, related_name="%(class)s")
creation = models.DateTimeField(auto_now_add=True)
renew = models.BooleanField(default=False)
def __unicode__(self):
return u"%s: %s %s" % (self.user, self.value, self.service)
def logout(self, request, session):
#if self.validate:
xml = """<samlp:LogoutRequest xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"
ID="%(id)s" Version="2.0" IssueInstant="%(datetime)s">
<saml:NameID xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"></saml:NameID>
<samlp:SessionIndex>%(ticket)s</samlp:SessionIndex>
</samlp:LogoutRequest>""" % {'id' : os.urandom(20).encode("hex"), 'datetime' : int(time.time()), 'ticket': self.value}
headers = {'Content-Type': 'text/xml'}
try:
return session.post(self.service.encode('utf-8'), data=xml.encode('utf-8'), headers=headers)
except Exception as e:
messages.add_message(request, messages.WARNING, _(u'Error during service logout %(service)s:\n%(error)s') % {'service': self.service, 'error':e})
class ServiceTicket(Ticket):
value = models.CharField(max_length=255, default=_gen_st, unique=True)
class ProxyTicket(Ticket):
value = models.CharField(max_length=255, default=_gen_pt, unique=True)
class ProxyGrantingTicket(Ticket):
value = models.CharField(max_length=255, default=_gen_pgt, unique=True)
#class ProxyGrantingTicketIOU(Ticket):
# value = models.CharField(max_length=255, default=lambda:_gen_ticket('PGTIOU'), unique=True)
class Proxy(models.Model):
class Meta:
ordering = ("-pk", )
url = models.CharField(max_length=255)
proxy_ticket = models.ForeignKey(ProxyTicket, related_name="proxies")