aboutsummaryrefslogtreecommitdiff
blob: 2db99812a5ec37584cfa2fa647955ad28afe080c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
# vim:fileencoding=utf8:et:ts=4:sts=4:sw=4:ft=python

from django.conf import settings
from django.contrib import messages
from django.contrib.auth import (login as _login, logout as _logout,
                                 authenticate)
from django.core.mail import send_mail
from django.core.urlresolvers import reverse
from django.db import IntegrityError
from django.forms.models import model_to_dict
from django.http import (HttpResponse, HttpResponseForbidden,
                         HttpResponseBadRequest)
from django.views.decorators.cache import cache_page
from django.shortcuts import redirect, render
from django.utils.html import format_html
from django.views.decorators.csrf import csrf_exempt
from django.views.decorators.http import require_POST
from django_otp.decorators import otp_required

from openid.extensions.ax import FetchRequest, FetchResponse
from openid.extensions.sreg import SRegRequest, SRegResponse
from openid.server.server import (Server, ProtocolError, EncodingError,
                                  CheckIDRequest, ENCODE_URL,
                                  ENCODE_KVFORM, ENCODE_HTML_FORM)
from passlib.hash import ldap_md5_crypt
from urlparse import urljoin

from okupy import OkupyError
from okupy.accounts.forms import (LoginForm, OpenIDLoginForm, SSLCertLoginForm,
                                  OTPForm, SignupForm, SiteAuthForm,
                                  StrongAuthForm, ProfileSettingsForm,
                                  ContactSettingsForm, EmailSettingsForm,
                                  GentooAccountSettingsForm, PasswordSettingsForm)
from okupy.accounts.models import LDAPUser, OpenID_Attributes, Queue
from okupy.accounts.openid_store import DjangoDBOpenIDStore
from okupy.common.ldap_helpers import (get_bound_ldapuser,
                                       set_secondary_password,
                                       remove_secondary_password)
from okupy.common.decorators import strong_auth_required, anonymous_required
from okupy.common.log import log_extra_data
from okupy.crypto.ciphers import sessionrefcipher
from okupy.crypto.models import RevokedToken
from okupy.otp import init_otp
from okupy.otp.sotp.models import SOTPDevice
from okupy.otp.totp.models import TOTPDevice

# the following two are for exceptions
import openid.yadis.discover
import openid.fetchers
import django_otp
import io
import ldap
import logging
import qrcode

logger = logging.getLogger('okupy')
logger_mail = logging.getLogger('mail_okupy')


@cache_page(60 * 20)
def lists(request, acc_list):
    devlist = LDAPUser.objects.all()
    if acc_list == 'devlist':
        devlist = devlist.filter(is_developer=True)
    elif acc_list == 'former-devlist':
        devlist = devlist.filter(is_retired=True)
    elif acc_list == 'foundation-members':
        devlist = devlist.filter(is_foundation=True)
    return render(request, '%s.html' % acc_list, {'devlist': devlist})


@otp_required
def index(request):
    ldb_user = LDAPUser.objects.filter(username=request.user.username)
    return render(request, 'index.html', {
        'ldb_user': ldb_user,
    })


def login(request):
    """ The login page """
    user = None
    oreq = request.session.get('openid_request', None)
    # this can be POST or GET, and can be null or empty
    next = request.REQUEST.get('next') or reverse(index)
    is_otp = False
    login_form = None
    strong_auth_req = 'strong_auth_requested' in request.session

    if oreq:
        login_form_class = OpenIDLoginForm
    elif ('strong_auth_requested' in request.session
            and request.user.is_authenticated()):
        login_form_class = StrongAuthForm
    else:
        login_form_class = LoginForm

    try:
        if request.method != 'POST':
            pass
        elif 'cancel' in request.POST:
            # note: this wipes request.session
            _logout(request)
            if oreq is not None:
                oresp = oreq.answer(False)
                return render_openid_response(request, oresp)
        elif 'otp_token' in request.POST:
            # if user's not authenticated, go back to square one
            if not request.user.is_authenticated():
                raise OkupyError('OTP verification timed out')

            is_otp = True
            otp_form = OTPForm(request.POST)
            if otp_form.is_valid():
                token = otp_form.cleaned_data['otp_token']
            else:
                raise OkupyError('OTP verification failed')

            # prevent replay attacks and race conditions
            if not RevokedToken.add(token, request.user):
                raise OkupyError('OTP verification failed')
            dev = django_otp.match_token(request.user, token)
            if not dev:
                raise OkupyError('OTP verification failed')
            django_otp.login(request, dev)
        else:
            login_form = login_form_class(request.POST)
            if login_form.is_valid():
                if login_form_class != StrongAuthForm:
                    username = login_form.cleaned_data['username']
                else:
                    username = request.user.username
                password = login_form.cleaned_data['password']
            else:
                raise OkupyError('Login failed')
            """
            Perform authentication, if it retrieves a user object then
            it was successful. If it retrieves None then it failed to login
            """
            try:
                user = authenticate(username=username, password=password)
            except Exception as error:
                logger.critical(error, extra=log_extra_data(request))
                logger_mail.exception(error)
                raise OkupyError(
                    "Can't contact the LDAP server or the database")
            if not user:
                raise OkupyError('Login failed')

            if oreq:
                request.session['auto_logout'] = (
                    login_form.cleaned_data['auto_logout'])
    except OkupyError as error:
        messages.error(request, str(error))

    if user and user.is_active:
        _login(request, user)
        # prepare devices, and see if OTP is enabled
        init_otp(request)
        set_secondary_password(request=request, password=password)
    if request.user.is_authenticated():
        if (strong_auth_req
                and not 'secondary_password' in request.session):
            if request.method != 'POST':
                messages.info(request, 'You need to type in your password'
                              + ' again to perform this action')
        else:
            if request.user.is_verified():
                return redirect(next)
            login_form = OTPForm()
            is_otp = True
    if login_form is None:
        login_form = login_form_class()

    if is_otp or strong_auth_req:
        ssl_auth_form = None
        ssl_auth_uri = None
        ssh_auth_command = None
    else:
        encrypted_id = sessionrefcipher.encrypt(request.session)

        # TODO: it fails when:
        # 1. site is accessed via IP (auth.127.0.0.1),
        # 2. HTTP used on non-standard port (https://...:8000).
        ssl_auth_form = SSLCertLoginForm({
            'session': encrypted_id,
            'next': request.build_absolute_uri(next),
            'login_uri': request.build_absolute_uri(request.get_full_path()),
        })

        ssl_auth_host = 'auth.' + request.get_host()
        ssl_auth_path = reverse(ssl_auth)
        ssl_auth_uri = urljoin('https://' + ssl_auth_host, ssl_auth_path)

        if settings.SSH_BIND[1] == 22:
            ssh_port_opt = ''
        else:
            ssh_port_opt = '-p %d ' % settings.SSH_BIND[1]

        ssh_auth_command = 'ssh %sauth+%s@%s' % (
            ssh_port_opt,
            encrypted_id,
            request.get_host().split(':')[0])

    return render(request, 'login.html', {
        'login_form': login_form,
        'openid_request': oreq,
        'next': next,
        'ssl_auth_uri': ssl_auth_uri,
        'ssl_auth_form': ssl_auth_form,
        'ssh_auth_command': ssh_auth_command,
        'is_otp': is_otp,
    })


@csrf_exempt
@require_POST
def ssl_auth(request):
    """ SSL certificate authentication. """

    ssl_auth_form = SSLCertLoginForm(request.POST)
    if not ssl_auth_form.is_valid():
        return HttpResponseBadRequest('400 Bad Request')

    session = ssl_auth_form.cleaned_data['session']
    next_uri = ssl_auth_form.cleaned_data['login_uri']

    user = authenticate(request=request)
    if user and user.is_active:
        _login(request, user)
        init_otp(request)
        if request.user.is_verified():  # OTP disabled
            next_uri = ssl_auth_form.cleaned_data['next']
    else:
        messages.error(request, 'Certificate authentication failed')

    # so, django will always start a new session for us. we need to copy
    # the data to the original session and preferably flush the new one.
    session.update(request.session)

    # always logout automatically from SSL-based auth
    # it's easy enough to log back in anyway
    if 'openid_request' in session:
        session['auto_logout'] = True

    session.save()
    request.session.flush()
    return redirect(next_uri)


def logout(request):
    """ The logout page """
    try:
        remove_secondary_password(request)
    except Exception as error:
        logger.critical(error, extra=log_extra_data(request))
        logger_mail.exception(error)
    finally:
        _logout(request)
    return redirect(login)


@anonymous_required
def signup(request):
    """ The signup page """
    signup_form = None
    if request.method == "POST":
        signup_form = SignupForm(request.POST)
        if signup_form.is_valid():
            try:
                try:
                    LDAPUser.objects.get(
                        username=signup_form.cleaned_data['username'])
                except LDAPUser.DoesNotExist:
                    pass
                except Exception as error:
                    logger.critical(error, extra=log_extra_data(request))
                    logger_mail.exception(error)
                    raise OkupyError("Can't contact LDAP server")
                else:
                    raise OkupyError('Username already exists')
                try:
                    LDAPUser.objects.get(
                        email__contains=signup_form.cleaned_data['email'])
                except LDAPUser.DoesNotExist:
                    pass
                else:
                    raise OkupyError('Email already exists')
                queued_user = Queue(
                    username=signup_form.cleaned_data['username'],
                    first_name=signup_form.cleaned_data['first_name'],
                    last_name=signup_form.cleaned_data['last_name'],
                    email=signup_form.cleaned_data['email'],
                    password=signup_form.cleaned_data['password_origin'],
                )
                try:
                    queued_user.save()
                except IntegrityError:
                    raise OkupyError('Account is already pending activation')
                except Exception as error:
                    logger.critical(error, extra=log_extra_data(request))
                    logger_mail.exception(error)
                    raise OkupyError("Can't contact the database")
                send_mail(
                    '%sAccount Activation' % settings.EMAIL_SUBJECT_PREFIX,
                    'To confirm your email address, please click the \
                    following link:\n%s' % queued_user.encrypted_id,
                    '%s' % settings.SERVER_EMAIL,
                    [signup_form.cleaned_data['email']]
                )
                messages.info(
                    request, "You will shortly receive an activation mail")
                return redirect(login)
            except OkupyError as error:
                messages.error(request, str(error))
    else:
        signup_form = SignupForm()
    return render(request, 'signup.html', {
        'signup_form': signup_form,
    })


@anonymous_required
def activate(request, token):
    """
    The page that users get to activate their accounts
    It is in the form /activate/$TOKEN
    """
    try:
        try:
            queued = Queue.objects.get(encrypted_id=token)
        except (Queue.DoesNotExist, OverflowError, TypeError, ValueError):
            raise OkupyError('Invalid URL')
        except Exception as error:
            logger.critical(error, extra=log_extra_data(request))
            logger_mail.exception(error)
            raise OkupyError("Can't contact the database")
        # get max uidNumber
        try:
            uidnumber = LDAPUser.objects.latest('uid').uid + 1
        except LDAPUser.DoesNotExist:
            uidnumber = 1
        except Exception as error:
            logger.critical(error, extra=log_extra_data(request))
            logger_mail.exception(error)
            raise OkupyError("Can't contact LDAP server")
        # add account to ldap
        new_user = LDAPUser(
            object_class=settings.AUTH_LDAP_USER_OBJECTCLASS,
            last_name=queued.last_name,
            full_name='%s %s' % (queued.first_name, queued.last_name),
            password=[ldap_md5_crypt.encrypt(queued.password)],
            first_name=queued.first_name,
            email=[queued.email],
            username=queued.username,
            uid=uidnumber,
            gid=100,
            gecos='%s %s' % (queued.first_name, queued.last_name),
            home_directory='/home/%s' % queued.username,
            ACL=['user.group'],
        )
        new_user.save()
        # remove queued account from DB
        queued.delete()
        messages.success(
            request, "Your account has been activated successfully")
    except OkupyError as error:
        messages.error(request, str(error))
    return redirect(login)


# Settings

@strong_auth_required
@otp_required
def profile_settings(request):
    """ Primary account settings, """
    user_profile_info = get_bound_ldapuser(request)
    profile_settings = None
    if request.method == "POST":
        profile_settings = ProfileSettingsForm(request.POST)
        if profile_settings.is_valid():
            try:
                #birthday = profile_settings.cleaned_data['birthday']
                first_name = profile_settings.cleaned_data['first_name']
                last_name = profile_settings.cleaned_data['last_name']

                if user_profile_info.first_name != first_name:
                    user_profile_info.first_name = first_name

                if user_profile_info.last_name != last_name:
                    user_profile_info.last_name = last_name

                user_profile_info.full_name = '%s %s' % (first_name, last_name)
                user_profile_info.gecos = '%s %s' % (first_name, last_name)

                """
                if user_profile_info.birthday != birthday:
                    user_profile_info.birthday = birthday
                """
                try:
                    user_profile_info.save()
                except IntegrityError:
                    pass
            except ldap.TYPE_OR_VALUE_EXISTS:
                pass
            except Exception as error:
                logger.critical(error, extra=log_extra_data(request))
                logger_mail.exception(error)
                raise OkupyError("Can't contact LDAP server")
    else:
        profile_settings = ProfileSettingsForm()

    return render(request, 'settings-profile.html', {
        'profile_settings': profile_settings,
        'user_profile_info': user_profile_info,
    })


@strong_auth_required
@otp_required
def password_settings(request):
    """ Password settings """
    user_profile_info = get_bound_ldapuser(request)
    password_settings = None
    if request.method == "POST":
        password_settings = PasswordSettingsForm(request.POST)
        if password_settings.is_valid():
            try:
                new_password = password_settings.cleaned_data['new_password']
                new_password_verify = password_settings.cleaned_data['new_password_verify']
                old_password = password_settings.cleaned_data['old_password']

                if old_password and (new_password == new_password_verify):
                    for hash in list(user_profile_info.password):
                        print hash
                        try:
                            if ldap_md5_crypt.verify(old_password, hash):
                                user_profile_info.password.append(ldap_md5_crypt.encrypt(new_password_verify))
                                user_profile_info.password.remove(hash)
                                break
                        except ValueError:
                            # ignore unknown hashes
                            pass
                try:
                    user_profile_info.save()
                except IntegrityError:
                    pass
            except ldap.TYPE_OR_VALUE_EXISTS:
                pass
            except Exception as error:
                logger.critical(error, extra=log_extra_data(request))
                logger_mail.exception(error)
                raise OkupyError("Can't contact LDAP server")
    else:
        password_settings = PasswordSettingsForm()

    return render(request, 'settings-password.html', {
        'password_settings': password_settings,
        'user_profile_info': user_profile_info,
    })


@strong_auth_required
@otp_required
def email_settings(request):
    """ Email Settings """
    user_profile_info = get_bound_ldapuser(request)
    email_settings = None
    if request.method == "POST":
        email_settings = EmailSettingsForm(request.POST)
        if email_settings.is_valid():
            try:
                email = email_settings.cleaned_data['email']

                if request.POST.get('delete'):
                    user_profile_info.email.remove(email)
                else:
                    user_profile_info.email.append(email)

                try:
                    user_profile_info.save()
                except IntegrityError:
                    pass
            except ldap.TYPE_OR_VALUE_EXISTS:
                pass
            except Exception as error:
                logger.critical(error, extra=log_extra_data(request))
                logger_mail.exception(error)
                raise OkupyError("Can't contact LDAP server")
    else:
        email_settings = EmailSettingsForm()

    return render(request, 'settings-email.html', {
        'email_settings': email_settings,
        'user_profile_info': user_profile_info,
    })


@strong_auth_required
@otp_required
def contact_settings(request):
    """ Contact details """
    user_profile_info = get_bound_ldapuser(request)
    contact_settings = None
    if request.method == "POST":
        contact_settings = ContactSettingsForm(request.POST)
        if contact_settings.is_valid():
            try:
                gpg_fingerprint = contact_settings.cleaned_data['gpg_fingerprint']
                im = contact_settings.cleaned_data['im']
                latitude = contact_settings.cleaned_data['latitude']
                location = contact_settings.cleaned_data['location']
                longitude = contact_settings.cleaned_data['longitude']
                phone = contact_settings.cleaned_data['phone']
                website = contact_settings.cleaned_data['website']

                if user_profile_info.location != location:
                    user_profile_info.location = location

                if user_profile_info.phone != phone:
                    user_profile_info.phone = phone

                if user_profile_info.website != website:
                    user_profile_info.website.pop()
                    user_profile_info.website.append(website)

                if user_profile_info.im != im:
                    user_profile_info.im.pop()
                    user_profile_info.im.append(im)

                if user_profile_info.longitude != longitude:
                    user_profile_info.longitude = longitude

                if user_profile_info.latitude != latitude:
                    user_profile_info.latitude = latitude

                if user_profile_info.gpg_fingerprint != gpg_fingerprint:
                    user_profile_info.gpg_fingerprint.pop()
                    user_profile_info.gpg_fingerprint.append(gpg_fingerprint)

                try:
                    user_profile_info.save()
                except IntegrityError:
                    pass
            except ldap.TYPE_OR_VALUE_EXISTS:
                pass
            except Exception as error:
                logger.critical(error, extra=log_extra_data(request))
                logger_mail.exception(error)
                raise OkupyError("Can't contact LDAP server")
    else:
        contact_settings = ContactSettingsForm()

    return render(request, 'settings-contact.html', {
        'contact_settings': contact_settings,
        'user_profile_info': user_profile_info,
    })


@strong_auth_required
@otp_required
def gentoo_dev_settings(request):
    """ Gentoo related information """
    user_profile_info = get_bound_ldapuser(request)
    gentoo_account_settings = None
    if request.method == "POST":
        gentoo_account_settings = GentooAccountSettingsForm(request.POST)
        if gentoo_account_settings.is_valid():
            try:
                devbug = gentoo_account_settings.cleaned_data['developer_bug']
                gentoo_join_date = gentoo_account_settings.cleaned_data['gentoo_join_date']
                gentoo_mentor = gentoo_account_settings.cleaned_data['mentor']
                ssh_pubkey = gentoo_account_settings.cleaned_data['ssh_key']

                if user_profile_info.developer_bug != devbug:
                    user_profile_info.developer_bug.append(devbug)

                if user_profile_info.gentoo_join_date != gentoo_join_date:
                    user_profile_info.gentoo_join_date.append(gentoo_join_date)

                if user_profile_info.mentor != gentoo_mentor:
                    user_profile_info.mentor.append(gentoo_mentor)

                if ssh_pubkey:
                    user_profile_info.ssh_key.append(ssh_pubkey)

                if user_profile_info.is_retired or user_profile_info.gentoo_retire_date:
                    gentoo_retire_date = gentoo_account_settings.cleaned_data['gentoo_retire_date']
                    if user_profile_info.gentoo_retire_date != gentoo_retire_date:
                        user_profile_info.gentoo_retire_date.append(
                            gentoo_retire_date)

                try:
                    user_profile_info.save()
                except IntegrityError:
                    pass
            except ldap.TYPE_OR_VALUE_EXISTS:
                pass
            except Exception as error:
                logger.critical(error, extra=log_extra_data(request))
                logger_mail.exception(error)
                raise OkupyError("Can't contact LDAP server")
    else:
        gentoo_account_settings = GentooAccountSettingsForm()

    return render(request, 'settings-gentoo.html', {
        'gentoo_account_settings': gentoo_account_settings,
        'user_profile_info': user_profile_info,
    })


@strong_auth_required
@otp_required
def otp_setup(request):
    dev = TOTPDevice.objects.get(user=request.user)
    secret = None
    conf_form = None
    skeys = None
    user = get_bound_ldapuser(request)

    if request.method == 'POST':
        if 'disable' in request.POST:
            dev.disable(user)
        elif 'confirm' in request.POST and 'otp_secret' in request.session:
            secret = request.session['otp_secret']
            conf_form = OTPForm(request.POST)
            try:
                if not conf_form.is_valid():
                    raise OkupyError()
                token = conf_form.cleaned_data['otp_token']

                # prevent reusing the same token to login
                if not RevokedToken.add(token, request.user):
                    raise OkupyError()
                if not dev.verify_token(token, secret):
                    raise OkupyError()
            except OkupyError:
                messages.error(request, 'Token verification failed.')
                conf_form = OTPForm()
            else:
                dev.enable(user, secret)
                secret = None
                conf_form = None
                sdev = SOTPDevice.objects.get(user=request.user)
                skeys = sdev.gen_keys(user)
                messages.info(request, 'The new secret has been set.')
        elif 'enable' in request.POST:
            secret = dev.gen_secret()
            request.session['otp_secret'] = secret
            conf_form = OTPForm()
        elif 'recovery' in request.POST:
            sdev = SOTPDevice.objects.get(user=request.user)
            skeys = sdev.gen_keys(user)
            messages.info(request, 'Your old recovery keys have been revoked.')
        elif 'cancel' in request.POST:
            messages.info(request, 'Secret change aborted. Previous settings'
                          'are in effect.')

    if secret:
        # into groups of four characters
        secret = ' '.join([secret[i:i + 4]
                           for i in range(0, len(secret), 4)])
    if skeys:
        # xxx xx xxx
        def group_key(s):
            return ' '.join([s[0:3], s[3:5], s[5:8]])
        skeys = list([group_key(k) for k in skeys])

    return render(request, 'otp-setup.html', {
        'otp_enabled': dev.is_enabled(),
        'secret': secret,
        'conf_form': conf_form,
        'skeys': skeys,
    })


def otp_qrcode(request):
    dev = TOTPDevice()
    secret = request.session.get('otp_secret')
    if not secret:
        return HttpResponseForbidden()

    qr = qrcode.make(dev.get_uri(secret), box_size=5)
    f = io.BytesIO()
    qr.save(f, 'PNG')

    return HttpResponse(f.getvalue(), content_type='image/png')


# OpenID-specific


def endpoint_url(request):
    return request.build_absolute_uri(reverse(openid_endpoint))


def get_openid_server(request):
    store = DjangoDBOpenIDStore()
    return Server(store, endpoint_url(request))


def render_openid_response(request, oresp, srv=None):
    if srv is None:
        srv = get_openid_server(request)

    try:
        eresp = srv.encodeResponse(oresp)
    except EncodingError as e:
        # TODO: do we want some different heading for it?
        return render(request, 'openid_endpoint.html', {
            'error': str(e),
        }, status=500)

    dresp = HttpResponse(eresp.body, status=eresp.code)
    for h, v in eresp.headers.items():
        dresp[h] = v

    return dresp


@csrf_exempt
def openid_endpoint(request):
    if request.method == 'POST':
        req = request.POST
    else:
        req = request.GET

    srv = get_openid_server(request)

    try:
        oreq = srv.decodeRequest(req)
    except ProtocolError as e:
        if e.whichEncoding() == ENCODE_URL:
            return redirect(e.encodeToURL())
        elif e.whichEncoding() == ENCODE_HTML_FORM:
            return HttpResponse(e.toHTML())
        elif e.whichEncoding() == ENCODE_KVFORM:
            return HttpResponse(e.encodeToKVForm(), status=400)
        else:
            return render(request, 'openid_endpoint.html', {
                'error': str(e)
            }, status=400)

    if oreq is None:
        return render(request, 'openid_endpoint.html')

    if isinstance(oreq, CheckIDRequest):
        # immediate requests not supported yet, so immediately
        # reject them.
        if oreq.immediate:
            oresp = oreq.answer(False)
        else:
            request.session['openid_request'] = oreq
            return redirect(openid_auth_site)
    else:
        oresp = srv.handleRequest(oreq)

    return render_openid_response(request, oresp, srv)


def user_page(request, username):
    return render(request, 'user-page.html', {
        'endpoint_uri': endpoint_url(request),
    })


openid_ax_attribute_mapping = {
    # http://web.archive.org/web/20110714025426/http://www.axschema.org/types/
    'http://axschema.org/namePerson/friendly': 'nickname',
    'http://axschema.org/contact/email': 'email',
    'http://axschema.org/namePerson': 'fullname',
    'http://axschema.org/birthDate': 'dob',
    'http://axschema.org/person/gender': 'gender',
    'http://axschema.org/contact/postalCode/home': 'postcode',
    'http://axschema.org/contact/country/home': 'country',
    'http://axschema.org/pref/language': 'language',
    'http://axschema.org/pref/timezone': 'timezone',

    # TODO: provide further attributes
}


@otp_required
def openid_auth_site(request):
    try:
        oreq = request.session['openid_request']
    except KeyError:
        return render(request, 'openid-auth-site.html', {
            'error': 'No OpenID request associated. The request may have \
            expired.',
        }, status=400)

    sreg = SRegRequest.fromOpenIDRequest(oreq)
    ax = FetchRequest.fromOpenIDRequest(oreq)

    sreg_fields = set(sreg.allRequestedFields())
    if ax:
        for uri in ax.requested_attributes:
            k = openid_ax_attribute_mapping.get(uri)
            if k:
                sreg_fields.add(k)

    ldap_user = LDAPUser.objects.get(username=request.user.username)
    if sreg_fields:
        sreg_data = {
            'nickname': ldap_user.username,
            'email': ldap_user.email,
            'fullname': ldap_user.full_name,
            'dob': ldap_user.birthday,
        }

        for k in list(sreg_data):
            if not sreg_data[k]:
                del sreg_data[k]
    else:
        sreg_data = {}
    sreg_fields = sreg_data.keys()

    # Read preferences from the db.
    try:
        saved_pref = OpenID_Attributes.objects.get(
            uid=ldap_user.uid,
            trust_root=oreq.trust_root,
        )
    except OpenID_Attributes.DoesNotExist:
        saved_pref = None
        auto_auth = False
    else:
        auto_auth = saved_pref.always_auth

    if auto_auth or request.POST:
        if auto_auth:
            # TODO: can we do this nicer?
            form_inp = model_to_dict(saved_pref)
        else:
            form_inp = request.POST
        form = SiteAuthForm(form_inp, instance=saved_pref)
        # can it be invalid somehow?
        assert(form.is_valid())
        attrs = form.save(commit=False)

        # nullify fields that were not requested
        for fn in form.cleaned_data:
            if fn in ('always_auth',):
                pass
            elif hasattr(attrs, fn) and fn not in sreg_fields:
                setattr(attrs, fn, None)

        if auto_auth or 'accept' in request.POST:
            # prepare sreg response
            for fn, send in form.cleaned_data.items():
                if fn not in sreg_data:
                    pass
                elif not send:
                    del sreg_data[fn]
                elif isinstance(sreg_data[fn], list):
                    form_key = 'which_%s' % fn
                    val = form.cleaned_data[form_key]
                    if val not in sreg_data[fn]:
                        raise NotImplementedError(
                            'Changing choices not implemented yet')
                    sreg_data[fn] = val
                    if not auto_auth:
                        setattr(attrs, form_key, val)

            if not auto_auth:
                # save prefs in the db
                # (if auto_auth, then nothing changed)
                attrs.uid = ldap_user.uid
                attrs.trust_root = oreq.trust_root
                attrs.save()

            oresp = oreq.answer(True, identity=request.build_absolute_uri(
                reverse(user_page, args=(request.user.username,))))

            sreg_resp = SRegResponse.extractResponse(sreg, sreg_data)
            oresp.addExtension(sreg_resp)

            if ax:
                ax_resp = FetchResponse(ax)
                for uri in ax.requested_attributes:
                    k = openid_ax_attribute_mapping.get(uri)
                    if k and k in sreg_data:
                        ax_resp.addValue(uri, sreg_data[k])
                oresp.addExtension(ax_resp)
        elif 'reject' in request.POST:
            oresp = oreq.answer(False)
        else:
            return render(request, 'openid-auth-site.html', {
                'error': 'Invalid request submitted.',
            }, status=400)

        if request.session.get('auto_logout', False):
            # _logout clears request.session
            _logout(request)
        else:
            del request.session['openid_request']
        return render_openid_response(request, oresp)

    form = SiteAuthForm(instance=saved_pref)
    sreg_form = {}
    # Fill in lists for choices
    for f in sreg_fields:
        if f not in sreg_data:
            pass
        elif isinstance(sreg_data[f], list):
            form.fields['which_%s' % f].widget.choices = [
                (x, x) for x in sreg_data[f]
            ]
            sreg_form[f] = form['which_%s' % f]
        else:
            sreg_form[f] = format_html("<input type='text'"
                                       + " readonly='readonly'"
                                       + " value='{0}' />",
                                       sreg_data[f])

    try:
        # TODO: cache it
        if oreq.returnToVerified():
            tr_valid = 'Return-To valid and trusted'
        else:
            tr_valid = 'Return-To untrusted'
    except openid.yadis.discover.DiscoveryFailure:
        tr_valid = 'Unable to verify trust (Yadis unsupported)'
    except openid.fetchers.HTTPFetchingError:
        tr_valid = 'Unable to verify trust (HTTP error)'

    return render(request, 'openid-auth-site.html', {
        'openid_request': oreq,
        'return_to_valid': tr_valid,
        'form': form,
        'sreg': sreg_fields,
        'sreg_form': sreg_form,
        'policy_url': sreg.policy_url,
    })