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django-cas-server
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Add logging capabilities

This commit is contained in:
Valentin Samir 2015-12-13 13:50:29 +01:00
parent cd4b9846cd
commit 20aa4c0d74
3 changed files with 208 additions and 10 deletions
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68
README.rst
View File

@ -161,3 +161,71 @@ Authentication backend
This is the default backend. The returned attributes are the fields available on the user model.
* mysql backend ``cas_server.auth.MysqlAuthUser``: see the 'Mysql backend settings' section.
The returned attributes are those return by sql query ``CAS_SQL_USER_QUERY``.
Logs
----
``django-cas-server`` logs most of its actions. To enable login, you must set the ``LOGGING``
(https://docs.djangoproject.com/en/dev/topics/logging) variable is ``settings.py``.
Users successful actions (login, logout) are logged with the level ``INFO``, failures are logged
with the level ``WARNING`` and user attributes transmitted to a service are logged with the level ``DEBUG``.
For exemple to log to syslog you can use :
.. code-block:: python
LOGGING = {
'version': 1,
'disable_existing_loggers': False,
'formatters': {
'cas_syslog': {
'format': 'cas: %(levelname)s %(message)s'
},
},
'handlers': {
'cas_syslog': {
'level': 'INFO',
'class': 'logging.handlers.SysLogHandler',
'address': '/dev/log',
'formatter': 'cas_syslog',
},
},
'loggers': {
'cas_server': {
'handlers': ['cas_syslog'],
'level': 'INFO',
'propagate': True,
},
},
}
Or to log to a file:
.. code-block:: python
LOGGING = {
'version': 1,
'disable_existing_loggers': False,
'formatters': {
'cas_file': {
'format': '%(asctime)s %(levelname)s %(message)s'
},
},
'handlers': {
'cas_file': {
'level': 'INFO',
'class': 'logging.FileHandler',
'filename': '/tmp/cas_server.log',
'formatter': 'cas_file',
},
},
'loggers': {
'cas_server': {
'handlers': ['cas_file'],
'level': 'INFO',
'propagate': True,
},
},
}

44
cas_server/models.py
View File

@ -22,6 +22,7 @@ from picklefield.fields import PickledObjectField
import re
import os
import sys
import logging
from importlib import import_module
from datetime import timedelta
from concurrent.futures import ThreadPoolExecutor
@ -31,6 +32,8 @@ import cas_server.utils as utils
SessionStore = import_module(settings.SESSION_ENGINE).SessionStore
logger = logging.getLogger(__name__)
class User(models.Model):
"""A user logged into the CAS"""
@ -82,6 +85,12 @@ class User(models.Model):
try:
future.result()
except Exception as error:
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(
@ -125,6 +134,7 @@ class User(models.Model):
after a Service Ticket has been generated"""
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
@ -220,6 +230,7 @@ class ServicePattern(models.Model):
def check_user(self, user):
"""Check if `user` if allowed to use theses services"""
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):
@ -230,12 +241,28 @@ class ServicePattern(models.Model):
if re.match(filtre.pattern, str(value)):
break
else:
logger.warning(
"User constraint failed for %s, service %s: %s do not match %s %s." % (
user.username,
self.name,
filtre.pattern,
filtre.attribut,
user.attributs.get(filtre.attribut)
)
)
raise BadFilter('%s do not match %s %s' % (
filtre.pattern,
filtre.attribut,
user.attributs.get(filtre.attribut)
))
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
@ -246,6 +273,7 @@ class ServicePattern(models.Model):
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()
@ -378,6 +406,7 @@ class Ticket(models.Model):
try:
future.result()
except Exception as error:
logger.warning("Error durring SLO %s" % error)
sys.stderr.write("%r\n" % error)
def logout(self, request, session, async_list=None):
@ -386,6 +415,12 @@ class Ticket(models.Model):
self.validate = True
self.save()
if self.validate and self.single_log_out:
logger.info(
"Sending SLO requests to service %s for user %s" % (
self.service,
self.user.username
)
)
try:
xml = u"""<samlp:LogoutRequest xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"
ID="%(id)s" Version="2.0" IssueInstant="%(datetime)s">
@ -409,8 +444,15 @@ class Ticket(models.Model):
)
)
except Exception as error:
error = utils.unpack_nested_exception(error)
logger.warning(
"Error durring SLO for user %s on service %s: %s" % (
self.user.username,
self.service,
error
)
)
if request is not None:
error = utils.unpack_nested_exception(error)
messages.add_message(
request,
messages.WARNING,

106
cas_server/views.py
View File

@ -23,6 +23,8 @@ from django.views.decorators.csrf import csrf_exempt
from django.views.generic import View
import logging
import pprint
import requests
from lxml import etree
from datetime import timedelta
@ -38,6 +40,8 @@ from .models import ServicePattern
SessionStore = import_module(settings.SESSION_ENGINE).SessionStore
logger = logging.getLogger(__name__)
class AttributesMixin(object):
"""mixin for the attributs methode"""
@ -60,9 +64,14 @@ class LogoutMixin(object):
"""destroy CAS session utils"""
def logout(self, all=False):
"""effectively destroy CAS session"""
username = self.request.session.get("username")
if username:
if all:
logger.info("Logging out user %s from all of they sessions." % username)
else:
logger.info("Logging out user %s." % username)
# logout the user from the current session
try:
username = self.request.session.get("username")
user = models.User.objects.get(
username=username,
session_key=self.request.session.session_key
@ -81,6 +90,7 @@ class LogoutMixin(object):
session.flush()
user.logout(self.request)
user.delete()
logger.info("User %s logged out" % username)
class LogoutView(View, LogoutMixin):
@ -97,6 +107,7 @@ class LogoutView(View, LogoutMixin):
def get(self, request, *args, **kwargs):
"""methode called on GET request on this view"""
logger.info("logout requested")
self.init_get(request)
self.logout(self.request.GET.get("all"))
# if service is set, redirect to service after logout
@ -212,6 +223,7 @@ class LoginView(View, LogoutMixin):
# if not set a new LT and fail
values['lt'] = self.request.session['lt'][-1]
self.init_form(values)
logger.warning("Receive an invalid login ticket")
return self.INVALID_LOGIN_TICKET
elif not self.request.session.get("authenticated") or self.renew:
self.init_form(self.request.POST)
@ -222,10 +234,13 @@ class LoginView(View, LogoutMixin):
self.request.session["authenticated"] = True
self.renewed = True
self.warned = True
logger.info("User %s successfully authenticated" % self.request.session["username"])
return self.USER_LOGIN_OK
else:
logger.warning("A logging attemps failed")
return self.USER_LOGIN_FAILURE
else:
logger.warning("Receuve a logging attempt whereas the user is already logged")
return self.USER_ALREADY_LOGGED
def init_get(self, request):
@ -356,6 +371,11 @@ class LoginView(View, LogoutMixin):
session_key=self.request.session.session_key
)
except models.User.DoesNotExist:
logger.warning(
"User %s seems authenticated but is not found in the database." % (
self.request.session.get("username"),
)
)
self.logout()
if self.ajax:
data = {
@ -503,10 +523,27 @@ class Validate(View):
)
ticket.validate = True
ticket.save()
logger.info(
"Validate: Service ticket %s validated, user %s authenticated on service %s" % (
ticket.value,
ticket.user.username,
ticket.service
)
)
return HttpResponse("yes\n", content_type="text/plain")
except ServiceTicket.DoesNotExist:
logger.warning(
(
"Validate: Service ticket %s not found or "
"already validated, auth to %s failed"
) % (
ticket,
service
)
)
return HttpResponse("no\n", content_type="text/plain")
else:
logger.warning("Validate: service or ticket missing")
return HttpResponse("no\n", content_type="text/plain")
@ -548,6 +585,7 @@ class ValidateService(View, AttributesMixin):
self.renew = True if request.GET.get('renew') else False
if not self.service or not self.ticket:
logger.warning("ValidateService: missing ticket or service")
return ValidateError(
'INVALID_REQUEST',
"you must specify a service and a ticket"
@ -568,6 +606,18 @@ class ValidateService(View, AttributesMixin):
if self.pgt_url and self.pgt_url.startswith("https://"):
return self.process_pgturl(params)
else:
logger.info(
"ValidateService: ticket %s validated for user %s on service %s." % (
self.ticket.value,
self.ticket.user.username,
self.ticket.service
)
)
logger.debug(
"ValidateService: User attributs are:\n%s" % (
pprint.pformat(self.ticket.attributs),
)
)
return render(
request,
"cas_server/serviceValidate.xml",
@ -575,6 +625,9 @@ class ValidateService(View, AttributesMixin):
content_type="text/xml; charset=utf-8"
)
except ValidateError as error:
logger.warning(
"ValidateService: validation error: %s %s" % (error.code, error.msg)
)
return error.render(request)
def process_ticket(self):
@ -598,11 +651,11 @@ class ValidateService(View, AttributesMixin):
for prox in ticket.proxies.all():
proxies.append(prox.url)
else:
raise ValidateError('INVALID_TICKET')
raise ValidateError('INVALID_TICKET', self.ticket)
ticket.validate = True
ticket.save()
if ticket.service != self.service:
raise ValidateError('INVALID_SERVICE')
raise ValidateError('INVALID_SERVICE', self.service)
return ticket, proxies
except (ServiceTicket.DoesNotExist, ProxyTicket.DoesNotExist):
raise ValidateError('INVALID_TICKET', 'ticket not found')
@ -626,6 +679,22 @@ class ValidateService(View, AttributesMixin):
params['proxyGrantingTicket'] = proxyid
else:
pticket.delete()
logger.info(
(
"ValidateService: ticket %s validated for user %s on service %s. "
"Proxy Granting Ticket transmited to %s."
) % (
self.ticket.value,
self.ticket.user.username,
self.ticket.service,
self.pgt_url
)
)
logger.debug(
"ValidateService: User attributs are:\n%s" % (
pprint.pformat(self.ticket.attributs),
)
)
return render(
self.request,
"cas_server/serviceValidate.xml",
@ -668,6 +737,7 @@ class Proxy(View):
"you must specify and pgt and targetService"
)
except ValidateError as error:
logger.warning("Proxy: validation error: %s %s" % (error.code, error.msg))
return error.render(request)
def process_proxy(self):
@ -678,7 +748,7 @@ class Proxy(View):
if not pattern.proxy:
raise ValidateError(
'UNAUTHORIZED_SERVICE',
'the service do not allow proxy ticket'
'the service %s do not allow proxy ticket' % self.target_service
)
# is the proxy granting ticket valid
ticket = ProxyGrantingTicket.objects.get(
@ -694,6 +764,12 @@ class Proxy(View):
pattern,
renew=False)
models.Proxy.objects.create(proxy_ticket=pticket, url=ticket.service)
logger.info(
"Proxy ticket created for user %s on service %s." % (
ticket.user.username,
self.target_service
)
)
return render(
self.request,
"cas_server/proxy.xml",
@ -701,9 +777,9 @@ class Proxy(View):
content_type="text/xml; charset=utf-8"
)
except ProxyGrantingTicket.DoesNotExist:
raise ValidateError('INVALID_TICKET', 'PGT not found')
raise ValidateError('INVALID_TICKET', 'PGT %s not found' % self.pgt)
except ServicePattern.DoesNotExist:
raise ValidateError('UNAUTHORIZED_SERVICE')
raise ValidateError('UNAUTHORIZED_SERVICE', self.target_service)
except (models.BadUsername, models.BadFilter, models.UserFieldNotDefined):
raise ValidateError(
'UNAUTHORIZED_USER',
@ -771,6 +847,17 @@ class SamlValidate(View, AttributesMixin):
params['username'] = self.ticket.user.attributs.get(
self.ticket.service_pattern.user_field
)
logger.info(
"SamlValidate: ticket %s validated for user %s on service %s." % (
self.ticket.value,
self.ticket.user.username,
self.ticket.service
)
)
logger.debug(
"SamlValidate: User attributs are:\n%s" % pprint.pformat(self.ticket.attributs)
)
return render(
request,
"cas_server/samlValidate.xml",
@ -778,6 +865,7 @@ class SamlValidate(View, AttributesMixin):
content_type="text/xml; charset=utf-8"
)
except SamlValidateError as error:
logger.warning("SamlValidate: validation error: %s %s" % (error.code, error.msg))
return error.render(request)
def process_ticket(self):
@ -800,17 +888,17 @@ class SamlValidate(View, AttributesMixin):
else:
raise SamlValidateError(
'AuthnFailed',
'ticket should begin with PT- or ST-'
'ticket %s should begin with PT- or ST-' % ticket
)
ticket.validate = True
ticket.save()
if ticket.service != self.target:
raise SamlValidateError(
'AuthnFailed',
'TARGET do not match ticket service'
'TARGET %s do not match ticket service' % self.target
)
return ticket
except (IndexError, KeyError):
raise SamlValidateError('VersionMismatch')
except (ServiceTicket.DoesNotExist, ProxyTicket.DoesNotExist):
raise SamlValidateError('AuthnFailed', 'ticket not found')
raise SamlValidateError('AuthnFailed', 'ticket %s not found' % ticket)