User email verifications: Add rate limiting (Z#23232834) (#6219)

* User email verifications: Add rate limiting (Z#23232834)

Also, refactor rate limiting into a central utility

* Make ip block work in dev

* Review notes

* Update src/pretix/base/forms/user.py

Co-authored-by: luelista <weller@rami.io>

* Apply suggestions from code review

Co-authored-by: luelista <mira@teamwiki.de>

* Add rate limit reset

---------

Co-authored-by: luelista <weller@rami.io>
Co-authored-by: luelista <mira@teamwiki.de>

src/pretix/control/views/user.py

@@ -80,6 +80,7 @@ from pretix.control.permissions import (
 )
 from pretix.control.views.auth import get_u2f_appid, get_webauthn_rp_id
 from pretix.helpers.http import redirect_to_url
+from pretix.helpers.ratelimit import rate_limit, rate_limit_reset
 from pretix.helpers.security import session_reauth
 from pretix.helpers.u2f import websafe_encode
 
@@ -849,6 +850,7 @@ class UserPasswordChangeView(FormView):
             msgs = []
             msgs.append(_('Your password has been changed.'))
             self.request.user.send_security_notice(msgs)
+            rate_limit_reset("pwreset", self.request.user.pk)
 
             self.request.user.log_action('pretix.user.settings.changed', user=self.request.user, data={'new_pw': True})
 
@@ -879,6 +881,7 @@ class UserEmailChangeView(RecentAuthenticationRequiredMixin, FormView):
 
         return {
             **super().get_form_kwargs(),
+            "request": self.request,
             "user": self.request.user,
         }
 
@@ -908,6 +911,10 @@ class UserEmailVerifyView(View):
             messages.success(self.request, _('Your email address was already verified.'))
             return redirect(reverse('control:user.settings', kwargs={}))
 
+        if rate_limit("emailverify", self.request.user.pk, max_num=2, expire_time=300):
+            messages.error(self.request, _("For security reasons, please wait 5 minutes before you try again."))
+            return redirect(reverse('control:user.settings', kwargs={}))
+
         self.request.user.send_confirmation_code(
             session=self.request.session,
             reason='email_verify',