source: mauRepo/dj_security/trunk/dj_security/middleware.py @ 8712

Subversion URL: http://proj.badc.rl.ac.uk/svn/ndg/mauRepo/dj_security/trunk/dj_security/middleware.py@8712
Revision 8712, 4.7 KB checked in by mnagni, 6 years ago (diff)

corrects the previous (wrong) workflow

  • Property svn:mime-type set to text/plain
Line 
1'''
2BSD Licence
3Copyright (c) 2012, Science & Technology Facilities Council (STFC)
4All rights reserved.
5
6Redistribution and use in source and binary forms, with or without modification,
7are permitted provided that the following conditions are met:
8
9    * Redistributions of source code must retain the above copyright notice,
10        this list of conditions and the following disclaimer.
11    * Redistributions in binary form must reproduce the above copyright notice,
12        this list of conditions and the following disclaimer in the documentation
13        and/or other materials provided with the distribution.
14    * Neither the name of the Science & Technology Facilities Council (STFC)
15        nor the names of its contributors may be used to endorse or promote
16        products derived from this software without specific prior written permission.
17
18THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
20THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
22BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
23OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
26OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29Created on 2 Nov 2012
30
31@author: mnagni
32'''
33from paste.auth.auth_tkt import AuthTicket
34from django.conf import settings
35from django.db.utils import DatabaseError
36from dj_security.exception import DSJOpenIDNotFoundError
37from django.shortcuts import render_to_response
38
39from userdb_model.models import User
40
41import socket
42import urlparse
43import base64
44import logging
45
46# Get an instance of a logger
47LOGGER = logging.getLogger(__name__)
48
49class DJS_Middleware(object):
50    """
51        Validates if the actual user is authenticated agains a
52        given authentication service.
53        Actually the middleware intercepts all the requests submitted
54        to the underlying Django application and verifies if the presence
55        or not of a valid paste cookie in the request.
56    """           
57   
58    def process_request(self, request):
59        pass
60   
61    def process_response(self, request, response):
62        LOGGER.debug("responding to request.path: %s" % (request.path))
63        session = getattr(request, 'session', None)
64       
65        if not session:       
66            return response
67       
68        if request.GET.get('r') and getattr(request, 'session', None):
69            request.session['r'] = request.GET.get('r')
70
71        if request.path.endswith('account/register/'):
72            return _encode_authenticated_response(request, response)
73       
74        return response
75       
76   
77def _calculate_remote_ip(url_path):   
78    remote_url = urlparse.urlparse(url_path)
79    LOGGER.debug("calculating remote_ip for %s" % (str(remote_url)))
80    port = 80
81    host = None
82    if remote_url.netloc:
83        host = remote_url.netloc
84    elif remote_url.path:
85        host = remote_url.path
86       
87    if not host:
88        return None
89   
90    if ':' in host:
91        host, port = host.split(':')
92    addrinfo = socket.getaddrinfo(host, int(port))
93    LOGGER.info("%s has remote_ip %s" % (url_path, addrinfo[0][-1][0]))                                 
94    return addrinfo[0][-1][0]
95
96def get_user_byopenid(openid):
97    """
98        Returns a tbusers row specified by `openid`
99    - String **userkey**
100        a user
101    """
102    try:
103        return User.objects.get(openid=openid)
104    except DatabaseError as ex:
105        logging.error("Openid: %s - Not Found" % openid)
106        raise DSJOpenIDNotFoundError(ex) 
107
108def _encode_authenticated_response(request, response):
109    remote_ip = _calculate_remote_ip(base64.b64decode(request.session.get('r')))
110    LOGGER.info("responding to remote_ip: %s" % (remote_ip))
111    username = request.session.get('openid').openid
112    user = get_user_byopenid(username)
113   
114    token = AuthTicket(
115                getattr(settings, 'SHARED_SECRET', 'sharedsecret'),
116                username,
117                remote_ip,
118                user_data = '{"userkey": "%s"}' % (user.userkey))               
119    LOGGER.info("Created authTicket for %s from %s" % (username, remote_ip))
120    response.set_cookie('auth_tkt',
121                        token.cookie_value(),
122                        domain = getattr(settings, 'COOKIE_DOMAIN', None))
123    LOGGER.debug("Set authTicket in response for %s from %s"
124                 % (username, remote_ip))
125    return response
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