sso: Fixes for regressions after adding captcha and axes

- Change sso refresh url to refresh-pubtkt since refresh was conflicting with
  captcha's image refresh url.
- Fix datetime.timedelta calculation for refresh interval. Now validity of
  ticket is 30 seconds as it was intended to be. It was wrongly set to 30 days
  earlier.

Signed-off-by: Joseph Nuthalapati <njoseph@thoughtworks.com>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

actions/auth-pubtkt

@@ -89,18 +89,21 @@ def subcommand_create_key_pair(_):
             os.chmod(fil, 0o440)
 
 
-def create_ticket(pkey, uid, validuntil, ip=None, tokens=None,
-                  udata=None, graceperiod=None, extra_fields=None):
+def create_ticket(pkey,
+                  uid,
+                  validuntil,
+                  ip=None,
+                  tokens=None,
+                  udata=None,
+                  graceperiod=None,
+                  extra_fields=None):
     """Create and return a signed mod_auth_pubtkt ticket."""
     fields = [
-        'uid={}'.format(uid),
-        'validuntil={}'.format(validuntil, type='d'),
-        ip and 'cip={}'.format(ip),
-        tokens and 'tokens={}'.format(tokens),
-        graceperiod and 'graceperiod={}'.format(graceperiod, type='d'),
-        udata and 'udata={}'.format(udata),
-        extra_fields and ';'.join(
-            ['{}={}'.format(k, v) for k, v in extra_fields])
+        'uid={}'.format(uid), 'validuntil={}'.format(validuntil, type='d'), ip
+        and 'cip={}'.format(ip), tokens and 'tokens={}'.format(tokens),
+        graceperiod and 'graceperiod={}'.format(graceperiod, type='d'), udata
+        and 'udata={}'.format(udata), extra_fields
+        and ';'.join(['{}={}'.format(k, v) for k, v in extra_fields])
     ]
     data = ';'.join(filter(None, fields))
     signature = 'sig={}'.format(sign(pkey, data))
@@ -120,15 +123,22 @@ def subcommand_generate_ticket(arguments):
     tokens = arguments.tokens
     with open(private_key_file, 'r') as fil:
         pkey = crypto.load_privatekey(crypto.FILETYPE_PEM, fil.read().encode())
-    valid_until = minutes_from_now(30)
-    grace_period = minutes_from_now(25)
+    valid_until = seconds_from_now(30)
+    grace_period = seconds_from_now(25)
     print(create_ticket(
         pkey, uid, valid_until, tokens=tokens, graceperiod=grace_period))
 
 
-def minutes_from_now(minutes):
-    """Return a timestamp at the given number of minutes from now."""
-    return (datetime.datetime.now() + datetime.timedelta(minutes)).timestamp()
+# def minutes_from_now(minutes):
+#     """Return a timestamp at the given number of minutes from now."""
+#     return (datetime.datetime.now() + datetime.timedelta(
+#         0, minutes * 60)).timestamp()
+
+
+def seconds_from_now(seconds):
+    """Return a timestamp at the given number of seconds from now."""
+    return (
+        datetime.datetime.now() + datetime.timedelta(0, seconds)).timestamp()
 
 
 def main():

data/etc/apache2/includes/freedombox-single-sign-on.conf

@@ -3,7 +3,7 @@
     TKTAuthLoginURL /plinth/accounts/sso/login/
     TKTAuthBackArgName next
     TKTAuthDigest SHA512
-    TKTAuthRefreshURL /plinth/accounts/sso/refresh/
+    TKTAuthRefreshURL /plinth/accounts/sso/refresh-pubtkt/
     TKTAuthUnauthURL /plinth
     AuthType mod_auth_pubtkt
     AuthName "FreedomBox Single Sign On"

plinth/modules/sso/urls.py

@@ -20,11 +20,15 @@ URLs for the Single Sign On module.
 
 from django.conf.urls import url
 
-
 from .views import SSOLoginView, refresh
 from stronghold.decorators import public
+from plinth.utils import non_admin_view
 
 urlpatterns = [
-    url(r'^accounts/sso/login/$', public(SSOLoginView.as_view()), name='sso-login'),
-    url(r'^accounts/sso/refresh/$', refresh, name='sso-refresh'),
+    url(r'^accounts/sso/login/$',
+        public(SSOLoginView.as_view()),
+        name='sso-login'),
+    url(r'^accounts/sso/refresh-pubtkt/$',
+        non_admin_view(refresh),
+        name='sso-refresh'),
 ]

plinth/modules/sso/views.py

@@ -23,7 +23,6 @@ import os
 import urllib
 
 from django.contrib.auth import REDIRECT_FIELD_NAME
-from django.contrib.auth.decorators import login_required
 from django.contrib.auth.views import LoginView, LogoutView
 from django.http import HttpResponseRedirect
 
@@ -112,10 +111,11 @@ class SSOLogoutView(LogoutView):
         return response
 
 
-@login_required
 def refresh(request):
     """Simulate cookie refresh - redirect logged in user with a new cookie"""
     redirect_url = request.GET.get(REDIRECT_FIELD_NAME, '')
     response = HttpResponseRedirect(redirect_url)
     response.delete_cookie(SSO_COOKIE_NAME)
+    # Redirect with cookie doesn't work with 300 series
+    response.status_code = 200
     return set_ticket_cookie(request.user, response)

plinth/urls.py

@@ -34,11 +34,13 @@ urlpatterns = [
 
     # captcha urls are public
     url(r'image/(?P<key>\w+)/$',
-        public(cviews.captcha_image), name='captcha-image',
-        kwargs={'scale': 1}),
+        public(cviews.captcha_image), name='captcha-image', kwargs={
+            'scale': 1
+        }),
     url(r'image/(?P<key>\w+)@2/$',
-        public(cviews.captcha_image), name='captcha-image-2x',
-        kwargs={'scale': 2}),
+        public(cviews.captcha_image), name='captcha-image-2x', kwargs={
+            'scale': 2
+        }),
     url(r'audio/(?P<key>\w+)/$',
         public(cviews.captcha_audio), name='captcha-audio'),
     url(r'refresh/$', public(cviews.captcha_refresh), name='captcha-refresh'),