source: mauRepo/dj_security/trunk/dj_security/middleware.py @ 8714

Subversion URL: http://proj.badc.rl.ac.uk/svn/ndg/mauRepo/dj_security/trunk/dj_security/middleware.py@8714
Revision 8714, 4.8 KB checked in by mnagni, 6 years ago (diff)

Incomplete - # 22626: [CEDA Site Python Port] security middleware - add accountid to session info passed
 http://team.ceda.ac.uk/trac/ceda/ticket/22626

  • Property svn:mime-type set to text/plain
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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
37
38from userdb_model.models import User
39
40import socket
41import urlparse
42import base64
43import logging
44
45# Get an instance of a logger
46LOGGER = logging.getLogger(__name__)
47
48class DJS_Middleware(object):
49    """
50        Validates if the actual user is authenticated agains a
51        given authentication service.
52        Actually the middleware intercepts all the requests submitted
53        to the underlying Django application and verifies if the presence
54        or not of a valid paste cookie in the request.
55    """           
56   
57    def process_request(self, request):
58        pass
59   
60    def process_response(self, request, response):
61        LOGGER.debug("responding to request.path: %s" % (request.path))
62        session = getattr(request, 'session', None)
63       
64        if not session:       
65            return response
66       
67        if request.GET.get('r') and getattr(request, 'session', None):
68            request.session['r'] = request.GET.get('r')
69
70        if request.path.endswith('account/register/'):
71            return _encode_authenticated_response(request, response)
72       
73        return response
74       
75   
76def _calculate_remote_ip(url_path):   
77    remote_url = urlparse.urlparse(url_path)
78    LOGGER.debug("calculating remote_ip for %s" % (str(remote_url)))
79    port = 80
80    host = None
81    if remote_url.netloc:
82        host = remote_url.netloc
83    elif remote_url.path:
84        host = remote_url.path
85       
86    if not host:
87        return None
88   
89    if ':' in host:
90        host, port = host.split(':')
91    addrinfo = socket.getaddrinfo(host, int(port))
92    LOGGER.info("%s has remote_ip %s" % (url_path, addrinfo[0][-1][0]))                                 
93    return addrinfo[0][-1][0]
94
95def get_user_byopenid(openid):
96    """
97        Returns a tbusers row specified by `openid`
98    - String **userkey**
99        a user
100    """
101    try:
102        return User.objects.get(openid=openid)
103    except DatabaseError as ex:
104        logging.error("Openid: %s - Not Found" % openid)
105        raise DSJOpenIDNotFoundError(ex) 
106
107def _encode_authenticated_response(request, response):
108    remote_ip = _calculate_remote_ip(base64.b64decode(
109                                      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", "accountid": "%s"}'
119                % (user.userkey, getattr("user", "accountid", "NotAssigned")))               
120    LOGGER.info("Created authTicket for %s from %s" % (username, remote_ip))
121    response.set_cookie('auth_tkt',
122                        token.cookie_value(),
123                        domain = getattr(settings, 'COOKIE_DOMAIN', None))
124    LOGGER.debug("Set authTicket in response for %s from %s"
125                 % (username, remote_ip))
126    return response
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