Fixed #14881 -- Modified password reset to work with a non-integer UserModel.pk.

uid is now base64 encoded in password reset URLs/views. A backwards compatible
password_reset_confirm view/URL will allow password reset links generated before
this change to continue to work. This view will be removed in Django 1.7.

Thanks jonash for the initial patch and claudep for the review.

django/contrib/admin/templates/registration/password_reset_email.html

@@ -3,7 +3,7 @@
 
 {% trans "Please go to the following page and choose a new password:" %}
 {% block reset_link %}
-{{ protocol }}://{{ domain }}{% url 'password_reset_confirm' uidb36=uid token=token %}
+{{ protocol }}://{{ domain }}{% url 'password_reset_confirm' uidb64=uid token=token %}
 {% endblock %}
 {% trans "Your username, in case you've forgotten:" %} {{ user.get_username }}
 

django/contrib/auth/forms.py

@@ -6,8 +6,9 @@ from django import forms
 from django.forms.util import flatatt
 from django.template import loader
 from django.utils.datastructures import SortedDict
+from django.utils.encoding import force_bytes
 from django.utils.html import format_html, format_html_join
-from django.utils.http import int_to_base36
+from django.utils.http import urlsafe_base64_encode
 from django.utils.safestring import mark_safe
 from django.utils.text import capfirst
 from django.utils.translation import ugettext, ugettext_lazy as _
@@ -243,7 +244,7 @@ class PasswordResetForm(forms.Form):
                 'email': user.email,
                 'domain': domain,
                 'site_name': site_name,
-                'uid': int_to_base36(user.pk),
+                'uid': urlsafe_base64_encode(force_bytes(user.pk)),
                 'user': user,
                 'token': token_generator.make_token(user),
                 'protocol': 'https' if use_https else 'http',

django/contrib/auth/tests/templates/registration/password_reset_email.html

@@ -1 +1 @@
-{{ protocol }}://{{ domain }}/reset/{{ uid }}-{{ token }}/
+{{ protocol }}://{{ domain }}/reset/{{ uid }}/{{ token }}/

django/contrib/auth/tests/test_views.py

@@ -13,7 +13,7 @@ from django.core import mail
 from django.core.urlresolvers import reverse, NoReverseMatch
 from django.http import QueryDict, HttpRequest
 from django.utils.encoding import force_text
-from django.utils.http import urlquote
+from django.utils.http import int_to_base36, urlsafe_base64_decode, urlquote
 from django.utils._os import upath
 from django.test import TestCase
 from django.test.utils import override_settings, patch_logger
@@ -91,7 +91,7 @@ class AuthViewNamedURLTests(AuthViewsTestCase):
             ('password_reset', [], {}),
             ('password_reset_done', [], {}),
             ('password_reset_confirm', [], {
-                'uidb36': 'aaaaaaa',
+                'uidb64': 'aaaaaaa',
                 'token': '1111-aaaaa',
             }),
             ('password_reset_complete', [], {}),
@@ -193,6 +193,16 @@ class PasswordResetTest(AuthViewsTestCase):
         # redirect to a 'complete' page:
         self.assertContains(response, "Please enter your new password")
 
+    def test_confirm_valid_base36(self):
+        # Remove in Django 1.7
+        url, path = self._test_confirm_start()
+        path_parts = path.strip("/").split("/")
+        # construct an old style (base36) URL by converting the base64 ID
+        path_parts[1] = int_to_base36(int(urlsafe_base64_decode(path_parts[1])))
+        response = self.client.get("/%s/%s-%s/" % tuple(path_parts))
+        # redirect to a 'complete' page:
+        self.assertContains(response, "Please enter your new password")
+
     def test_confirm_invalid(self):
         url, path = self._test_confirm_start()
         # Let's munge the token in the path, but keep the same length,
@@ -204,11 +214,21 @@ class PasswordResetTest(AuthViewsTestCase):
 
     def test_confirm_invalid_user(self):
         # Ensure that we get a 200 response for a non-existant user, not a 404
+        response = self.client.get('/reset/123456/1-1/')
+        self.assertContains(response, "The password reset link was invalid")
+
+    def test_confirm_invalid_user_base36(self):
+        # Remove in Django 1.7
         response = self.client.get('/reset/123456-1-1/')
         self.assertContains(response, "The password reset link was invalid")
 
     def test_confirm_overflow_user(self):
         # Ensure that we get a 200 response for a base36 user id that overflows int
+        response = self.client.get('/reset/zzzzzzzzzzzzz/1-1/')
+        self.assertContains(response, "The password reset link was invalid")
+
+    def test_confirm_overflow_user_base36(self):
+        # Remove in Django 1.7
         response = self.client.get('/reset/zzzzzzzzzzzzz-1-1/')
         self.assertContains(response, "The password reset link was invalid")
 

django/contrib/auth/tests/urls.py

@@ -67,10 +67,10 @@ urlpatterns = urlpatterns + patterns('',
     (r'^password_reset_from_email/$', 'django.contrib.auth.views.password_reset', dict(from_email='staffmember@example.com')),
     (r'^password_reset/custom_redirect/$', 'django.contrib.auth.views.password_reset', dict(post_reset_redirect='/custom/')),
     (r'^password_reset/custom_redirect/named/$', 'django.contrib.auth.views.password_reset', dict(post_reset_redirect='password_reset')),
-    (r'^reset/custom/(?P<uidb36>[0-9A-Za-z]{1,13})-(?P<token>[0-9A-Za-z]{1,13}-[0-9A-Za-z]{1,20})/$',
+    (r'^reset/custom/(?P<uidb64>[0-9A-Za-z_\-]+)/(?P<token>[0-9A-Za-z]{1,13}-[0-9A-Za-z]{1,20})/$',
         'django.contrib.auth.views.password_reset_confirm',
         dict(post_reset_redirect='/custom/')),
-    (r'^reset/custom/named/(?P<uidb36>[0-9A-Za-z]{1,13})-(?P<token>[0-9A-Za-z]{1,13}-[0-9A-Za-z]{1,20})/$',
+    (r'^reset/custom/named/(?P<uidb64>[0-9A-Za-z_\-]+)/(?P<token>[0-9A-Za-z]{1,13}-[0-9A-Za-z]{1,20})/$',
         'django.contrib.auth.views.password_reset_confirm',
         dict(post_reset_redirect='password_reset')),
     (r'^password_change/custom/$', 'django.contrib.auth.views.password_change', dict(post_change_redirect='/custom/')),
@@ -88,4 +88,3 @@ urlpatterns = urlpatterns + patterns('',
     (r'^custom_request_auth_login/$', custom_request_auth_login),
     url(r'^userpage/(.+)/$', userpage, name="userpage"),
 )
-

django/contrib/auth/urls.py

@@ -12,7 +12,10 @@ urlpatterns = patterns('',
     url(r'^password_change/done/$', 'django.contrib.auth.views.password_change_done', name='password_change_done'),
     url(r'^password_reset/$', 'django.contrib.auth.views.password_reset', name='password_reset'),
     url(r'^password_reset/done/$', 'django.contrib.auth.views.password_reset_done', name='password_reset_done'),
+    # Support old style base36 password reset links; remove in Django 1.7
     url(r'^reset/(?P<uidb36>[0-9A-Za-z]{1,13})-(?P<token>[0-9A-Za-z]{1,13}-[0-9A-Za-z]{1,20})/$',
+        'django.contrib.auth.views.password_reset_confirm_uidb36'),
+    url(r'^reset/(?P<uidb64>[0-9A-Za-z_\-]+)/(?P<token>[0-9A-Za-z]{1,13}-[0-9A-Za-z]{1,20})/$',
         'django.contrib.auth.views.password_reset_confirm',
         name='password_reset_confirm'),
     url(r'^reset/done/$', 'django.contrib.auth.views.password_reset_complete', name='password_reset_complete'),

django/contrib/auth/views.py

@@ -7,9 +7,10 @@ from django.conf import settings
 from django.core.urlresolvers import reverse
 from django.http import HttpResponseRedirect, QueryDict
 from django.template.response import TemplateResponse
-from django.utils.http import base36_to_int, is_safe_url
+from django.utils.http import base36_to_int, is_safe_url, urlsafe_base64_decode, urlsafe_base64_encode
 from django.utils.translation import ugettext as _
 from django.shortcuts import resolve_url
+from django.utils.encoding import force_bytes, force_text
 from django.views.decorators.debug import sensitive_post_parameters
 from django.views.decorators.cache import never_cache
 from django.views.decorators.csrf import csrf_protect
@@ -184,7 +185,7 @@ def password_reset_done(request,
 # Doesn't need csrf_protect since no-one can guess the URL
 @sensitive_post_parameters()
 @never_cache
-def password_reset_confirm(request, uidb36=None, token=None,
+def password_reset_confirm(request, uidb64=None, token=None,
                            template_name='registration/password_reset_confirm.html',
                            token_generator=default_token_generator,
                            set_password_form=SetPasswordForm,
@@ -195,15 +196,15 @@ def password_reset_confirm(request, uidb36=None, token=None,
     form for entering a new password.
     """
     UserModel = get_user_model()
-    assert uidb36 is not None and token is not None  # checked by URLconf
+    assert uidb64 is not None and token is not None  # checked by URLconf
     if post_reset_redirect is None:
         post_reset_redirect = reverse('password_reset_complete')
     else:
         post_reset_redirect = resolve_url(post_reset_redirect)
     try:
-        uid_int = base36_to_int(uidb36)
-        user = UserModel._default_manager.get(pk=uid_int)
-    except (ValueError, OverflowError, UserModel.DoesNotExist):
+        uid = urlsafe_base64_decode(uidb64)
+        user = UserModel._default_manager.get(pk=uid)
+    except (TypeError, ValueError, OverflowError, UserModel.DoesNotExist):
         user = None
 
     if user is not None and token_generator.check_token(user, token):
@@ -227,6 +228,14 @@ def password_reset_confirm(request, uidb36=None, token=None,
     return TemplateResponse(request, template_name, context,
                             current_app=current_app)
 
+def password_reset_confirm_uidb36(request, uidb36=None, **kwargs):
+    # Support old password reset URLs that used base36 encoded user IDs.
+    # Remove in Django 1.7
+    try:
+      uidb64 = force_text(urlsafe_base64_encode(force_bytes(base36_to_int(uidb36))))
+    except ValueError:
+      uidb64 = '1' # dummy invalid ID (incorrect padding for base64)
+    return password_reset_confirm(request, uidb64=uidb64, **kwargs)
 
 def password_reset_complete(request,
                             template_name='registration/password_reset_complete.html',

django/utils/http.py

@@ -1,5 +1,6 @@
 from __future__ import unicode_literals
 
+import base64
 import calendar
 import datetime
 import re
@@ -11,7 +12,7 @@ except ImportError:     # Python 2
     import urlparse
     urllib_parse.urlparse = urlparse.urlparse
 
-
+from binascii import Error as BinasciiError
 from email.utils import formatdate
 
 from django.utils.datastructures import MultiValueDict
@@ -202,6 +203,24 @@ def int_to_base36(i):
         factor -= 1
     return ''.join(base36)
 
+def urlsafe_base64_encode(s):
+    """
+    Encodes a bytestring in base64 for use in URLs, stripping any trailing
+    equal signs.
+    """
+    return base64.urlsafe_b64encode(s).rstrip(b'\n=')
+
+def urlsafe_base64_decode(s):
+    """
+    Decodes a base64 encoded string, adding back any trailing equal signs that
+    might have been stripped.
+    """
+    s = s.encode('utf-8') # base64encode should only return ASCII.
+    try:
+        return base64.urlsafe_b64decode(s.ljust(len(s) + len(s) % 4, b'='))
+    except (LookupError, BinasciiError) as e:
+        raise ValueError(e)
+
 def parse_etags(etag_str):
     """
     Parses a string with one or several etags passed in If-None-Match and

docs/internals/deprecation.txt

@@ -326,6 +326,14 @@ these changes.
   remove calls to this method, and instead ensure that their auth related views
   are CSRF protected, which ensures that cookies are enabled.
 
+* The version of :func:`django.contrib.auth.views.password_reset_confirm` that
+  supports base36 encoded user IDs
+  (``django.contrib.auth.views.password_reset_confirm_uidb36``) will be
+  removed. If your site has been running Django 1.6 for more than
+  :setting:`PASSWORD_RESET_TIMEOUT_DAYS`, this change will have no effect. If
+  not, then any password reset links generated before you upgrade to Django 1.7
+  won't work after the upgrade.
+
 1.8
 ---
 

docs/ref/contrib/admin/index.txt

@@ -2278,9 +2278,14 @@ your URLconf. Specifically, add these four patterns:
 
     url(r'^admin/password_reset/$', 'django.contrib.auth.views.password_reset', name='admin_password_reset'),
     url(r'^admin/password_reset/done/$', 'django.contrib.auth.views.password_reset_done', name='password_reset_done'),
-    url(r'^reset/(?P<uidb36>[0-9A-Za-z]+)-(?P<token>.+)/$', 'django.contrib.auth.views.password_reset_confirm', name='password_reset_confirm'),
+    url(r'^reset/(?P<uidb64>[0-9A-Za-z_\-]+)/(?P<token>.+)/$', 'django.contrib.auth.views.password_reset_confirm', name='password_reset_confirm'),
     url(r'^reset/done/$', 'django.contrib.auth.views.password_reset_complete', name='password_reset_complete'),
 
+.. versionchanged:: 1.6
+
+    The pattern for :func:`~django.contrib.auth.views.password_reset_confirm`
+    changed as the ``uid`` is now base 64 encoded.
+
 (This assumes you've added the admin at ``admin/`` and requires that you put
 the URLs starting with ``^admin/`` before the line that includes the admin app
 itself).

docs/ref/utils.txt

@@ -649,6 +649,20 @@ escaping HTML.
     Converts a positive integer to a base 36 string. On Python 2 ``i`` must be
     smaller than :data:`sys.maxint`.
 
+.. function:: urlsafe_base64_encode(s)
+
+    .. versionadded:: 1.6
+
+    Encodes a bytestring in base64 for use in URLs, stripping any trailing
+    equal signs.
+
+.. function::  urlsafe_base64_decode(s)
+
+    .. versionadded:: 1.6
+
+    Decodes a base64 encoded string, adding back any trailing equal signs that
+    might have been stripped.
+
 ``django.utils.module_loading``
 ===============================
 

docs/releases/1.6.txt

@@ -656,6 +656,59 @@ rely on the previous URLs. If you want to revert to the original behavior you
 can set the
 :attr:`~django.contrib.admin.ModelAdmin.preserve_filters` attribute to ``False``.
 
+``django.contrib.auth`` password reset uses base 64 encoding of ``User`` PK
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Past versions of Django used base 36 encoding of the ``User`` primary key in
+the password reset views and URLs
+(:func:`django.contrib.auth.views.password_reset_confirm`). Base 36 encoding is
+sufficient if the user primary key is an integer, however, with the
+introduction of custom user models in Django 1.5, that assumption may no longer
+be true.
+
+:func:`django.contrib.auth.views.password_reset_confirm` has been modified to
+take a ``uidb64`` parameter instead of ``uidb36``. If you are reversing this
+view, for example in a custom ``password_reset_email.html`` template, be sure
+to update your code.
+
+A temporary shim for :func:`django.contrib.auth.views.password_reset_confirm`
+that will allow password reset links generated prior to Django 1.6 to continue
+to work has been added to provide backwards compatibility; this will be removed
+in Django 1.7. Thus, as long as your site has been running Django 1.6 for more
+than :setting:`PASSWORD_RESET_TIMEOUT_DAYS`, this change will have no effect.
+If not (for example, if you upgrade directly from Django 1.5 to Django 1.7),
+then any password reset links generated before you upgrade to Django 1.7 or
+later won't work after the upgrade.
+
+In addition, if you have any custom password reset URLs, you will need to
+update them by replacing ``uidb36`` with ``uidb64`` and the dash that follows
+that pattern with a slash. Also add ``_\-`` to the list of characters that may
+match the ``uidb64`` pattern.
+
+For example::
+
+    url(r'^reset/(?P<uidb36>[0-9A-Za-z]+)-(?P<token>.+)/$',
+        'django.contrib.auth.views.password_reset_confirm',
+        name='password_reset_confirm'),
+
+becomes::
+
+    url(r'^reset/(?P<uidb64>[0-9A-Za-z_\-]+)/(?P<token>.+)/$',
+        'django.contrib.auth.views.password_reset_confirm',
+        name='password_reset_confirm'),
+
+You may also want to add the shim to support the old style reset links. Using
+the example above, you would modify the existing url by replacing
+``django.contrib.auth.views.password_reset_confirm`` with
+``django.contrib.auth.views.password_reset_confirm_uidb36`` and also remove
+the ``name`` argument so it doesn't conflict with the new url::
+
+    url(r'^reset/(?P<uidb36>[0-9A-Za-z]+)-(?P<token>.+)/$',
+        'django.contrib.auth.views.password_reset_confirm_uidb36'),
+
+You can remove this url pattern after your app has been deployed with Django
+1.6 for :setting:`PASSWORD_RESET_TIMEOUT_DAYS`.
+
 Miscellaneous
 ~~~~~~~~~~~~~
 

docs/topics/auth/default.txt

@@ -817,7 +817,7 @@ patterns.
 
     * ``protocol``: http or https
 
-    * ``uid``: The user's id encoded in base 36.
+    * ``uid``: The user's primary key encoded in base 64.
 
     * ``token``: Token to check that the reset link is valid.
 
@@ -826,7 +826,12 @@ patterns.
     .. code-block:: html+django
 
         Someone asked for password reset for email {{ email }}. Follow the link below:
-        {{ protocol}}://{{ domain }}{% url 'password_reset_confirm' uidb36=uid token=token %}
+        {{ protocol}}://{{ domain }}{% url 'password_reset_confirm' uidb64=uid token=token %}
+
+    .. versionchanged:: 1.6
+
+      Reversing ``password_reset_confirm`` takes a ``uidb64`` argument instead
+      of ``uidb36``.
 
     The same template context is used for subject template. Subject must be
     single line plain text string.
@@ -846,7 +851,7 @@ patterns.
       Defaults to :file:`registration/password_reset_done.html` if not
       supplied.
 
-.. function:: password_reset_confirm(request[, uidb36, token, template_name, token_generator, set_password_form, post_reset_redirect])
+.. function:: password_reset_confirm(request[, uidb64, token, template_name, token_generator, set_password_form, post_reset_redirect])
 
     Presents a form for entering a new password.
 
@@ -854,7 +859,12 @@ patterns.
 
     **Optional arguments:**
 
-    * ``uidb36``: The user's id encoded in base 36. Defaults to ``None``.
+    * ``uidb64``: The user's id encoded in base 64. Defaults to ``None``.
+
+      .. versionchanged:: 1.6
+
+          The ``uidb64`` parameter was previously base 36 encoded and named
+          ``uidb36``.
 
     * ``token``: Token to check that the password is valid. Defaults to
       ``None``.
@@ -877,8 +887,8 @@ patterns.
     * ``form``: The form (see ``set_password_form`` above) for setting the
       new user's password.
 
-    * ``validlink``: Boolean, True if the link (combination of uidb36 and
-      token) is valid or unused yet.
+    * ``validlink``: Boolean, True if the link (combination of ``uidb64`` and
+      ``token``) is valid or unused yet.
 
 .. function:: password_reset_complete(request[,template_name])