__init__.py

   1 import subprocess
   2 import ldap
   3 import ldap.filter
   4
   5 from django.contrib.auth.middleware import RemoteUserMiddleware
   6 from django.contrib.auth.backends import RemoteUserBackend
   7 from django.contrib.auth.views import login
   8 from django.contrib.auth import REDIRECT_FIELD_NAME
   9 from django.http import HttpResponseRedirect
  10 from django.contrib import auth
  11 from django.core.exceptions import ObjectDoesNotExist
  12 from django.core.validators import URLValidator, ValidationError
  13
  14 import settings
  15
  16 def zephyr(msg, clas='message', instance='log', rcpt='nobody',):
  17     proc = subprocess.Popen(
  18         ['zwrite', '-d', '-n', '-c', clas, '-i', instance, rcpt, ],
  19         stdin=subprocess.PIPE, stdout=subprocess.PIPE
  20     )
  21     proc.communicate(msg)
  22
  23 def UrlOrAfsValidator(value):
  24     if value.startswith('/mit/') or value.startswith('/afs/'):
  25         return
  26     else:
  27         try:
  28             URLValidator()(value)
  29         except ValidationError:
  30             raise ValidationError('Provide a valid URL or AFS path')
  31
  32 class ScriptsRemoteUserMiddleware(RemoteUserMiddleware):
  33     header = 'SSL_CLIENT_S_DN_Email'
  34
  35 class ScriptsRemoteUserBackend(RemoteUserBackend):
  36     def clean_username(self, username, ):
  37         if '@' in username:
  38             name, domain = username.split('@')
  39             assert domain.upper() == 'MIT.EDU'
  40             return name
  41         else:
  42             return username
  43     def configure_user(self, user, ):
  44         username = user.username
  45         user.password = "ScriptsSSLAuth"
  46         con = ldap.open('ldap-too.mit.edu')
  47         con.simple_bind_s("", "")
  48         dn = "dc=mit,dc=edu"
  49         fields = ['cn', 'sn', 'givenName', 'mail', ]
  50         userfilter = ldap.filter.filter_format('uid=%s', [username])
  51         result = con.search_s('dc=mit,dc=edu', ldap.SCOPE_SUBTREE, userfilter, fields)
  52         if len(result) == 1:
  53             user.first_name = result[0][1]['givenName'][0]
  54             user.last_name = result[0][1]['sn'][0]
  55             try:
  56                 user.email = result[0][1]['mail'][0]
  57             except KeyError:
  58                 user.email = username + '@mit.edu'
  59             try:
  60                 user.groups.add(auth.models.Group.objects.get(name='mit'))
  61             except ObjectDoesNotExist:
  62                 print "Failed to retrieve mit group"
  63         else:
  64             raise ValueError, ("Could not find user with username '%s' (filter '%s')"%(username, userfilter))
  65         try:
  66             user.groups.add(auth.models.Group.objects.get(name='autocreated'))
  67         except ObjectDoesNotExist:
  68             print "Failed to retrieve autocreated group"
  69         user.save()
  70         return user
  71
  72 def get_or_create_mit_user(username, ):
  73     """
  74     Given an MIT username, return a Django user object for them.
  75     If necessary, create (and save) the Django user for them.
  76     If the MIT user doesn't exist, raises ValueError.
  77     """
  78     user, created = auth.models.User.objects.get_or_create(username=username, )
  79     if created:
  80         backend = ScriptsRemoteUserBackend()
  81         # Raises ValueError if the user doesn't exist
  82         try:
  83             return backend.configure_user(user), created
  84         except ValueError:
  85             user.delete()
  86             raise
  87     else:
  88         return user, created
  89
  90 def scripts_login(request, **kwargs):
  91     host = request.META['HTTP_HOST'].split(':')[0]
  92     if host == 'localhost':
  93         return login(request, **kwargs)
  94     elif request.META['SERVER_PORT'] == '444':
  95         if request.user.is_authenticated():
  96             # They're already authenticated --- go ahead and redirect
  97             if 'redirect_field_name' in kwargs:
  98                 redirect_field_name = kwargs['redirect_field_names']
  99             else:
 100                 from django.contrib.auth import REDIRECT_FIELD_NAME
 101                 redirect_field_name = REDIRECT_FIELD_NAME
 102             redirect_to = request.REQUEST.get(redirect_field_name, '')
 103             if not redirect_to or '//' in redirect_to or ' ' in redirect_to:
 104                 redirect_to = settings.LOGIN_REDIRECT_URL
 105             return HttpResponseRedirect(redirect_to)
 106         else:
 107             return login(request, **kwargs)
 108     else:
 109         # Move to port 444
 110         redirect_to = "https://%s:444%s" % (host, request.META['REQUEST_URI'], )
 111         return HttpResponseRedirect(redirect_to)