We recently ran into a payload in production that didn't contain
an event type at all. A payload where we can't figure out the event
type is quite rare. Instead of letting these payloads run amok, we
should raise a more informative exception for such unusual payloads.
If we encounter too many of these, then we can choose to conduct a
deeper investigation on a case-by-case basis.
With some changes by Tim Abbott.
TOR users are legitimate users of the system; however, that system can
also be used for abuse -- specifically, by evading IP-based
rate-limiting.
For the purposes of IP-based rate-limiting, add a
RATE_LIMIT_TOR_TOGETHER flag, defaulting to false, which lumps all
requests from TOR exit nodes into the same bucket. This may allow a
TOR user to deny other TOR users access to the find-my-account and
new-realm endpoints, but this is a low cost for cutting off a
significant potential abuse vector.
If enabled, the list of TOR exit nodes is fetched from their public
endpoint once per hour, via a cron job, and cached on disk. Django
processes load this data from disk, and cache it in memcached.
Requests are spared from the burden of checking disk on failure via a
circuitbreaker, which trips of there are two failures in a row, and
only begins trying again after 10 minutes.
For users who are not logged in and for those who don't have
'prefers_web_public_view' set in session, we redirect them
to the default login page where they can choose to login
as spectator or authenticated user.
This utilizes the generic `BaseNotes` we added for multipurpose
patching. With this migration as an example, we can further support
more types of notes to replace the monkey-patching approach we have used
throughout the codebase for type safety.
As we only return the actual decorator as-is only if `function` is
`None`, we can use `@overload` to accurately annotate the return type
for the decorator.
This commit adds moderators and full members options for
user_group_edit_policy by using COMMON_POLICY_TYPES.
Moderators do not require to be a member of user group in
order to edit or remove the user group if they are allowed
to do so according to user_group_edit_policy.
But full members need to be a member of user group to edit
or remove the user group.
This concludes the HttpRequest migration to eliminate arbitrary
attributes (except private ones that are belong to django) attached
to the request object during runtime and migrated them to a
separate data structure dedicated for the purpose of adding
information (so called notes) to a HttpRequest.
This includes the migration of fields that require trivial changes
to be migrated to be stored with ZulipRequestNotes.
Specifically _requestor_for_logs, _set_language, _query, error_format,
placeholder_open_graph_description, saveed_response, which were all
previously set on the HttpRequest object at some point. This migration
allows them to be typed.
We don't want this rate limit to affect legitimate users so it being hit
should be abnormal - thus worth logging so that we can spot if we're
rate limiting legitimate users and can know to increase the limit.
If the user is logged in, we'll stick to rate limiting by the
UserProfile. In case of requests without authentication, we'll apply the
same limits but to the IP address.
This option of specifying a different domain isn't used anywhere as of
now and we don't have a concrete way it could be used in the near
future. It's also getting in the way of how we want to do rate limiting
by IP, for which we'll want to apply a new domain 'api_by_ip'. That's
incompatible with how this decorator wants to determine the domain based
on the argument it receives when called to decorate a view function.
If in the future we want to have more granular control over API domains,
this can be refactored to be more general, but as of now it's just
imposing restrictions on how we can write the rate limiting code inside
it.
In addition to event filtering, we add support for registering supported
events for a webhook integration using the webhook_view decorator.
The event types are stored in the view function directly as a function
attribute, and can be later accessed via the module path and the view
function name are given (which is already specified the integrations.py)
Note that the WebhookTestCase doesn't know the name of the view function
and the module of the webhook. WEBHOOK_DIR_NAME needs to be overridden
if we want exceptions to raised when one of our test functions triggered
a unspecified event, but this practice is not enforced.
all_event_type does not need to be given even if event filters are used
in the webhook. But if a list of event types is given, it will be possible
for us to include it in the documentation while ensuring that all the
tested events are included (but not vice versa at the current stage, as
we yet not required all the events included in the list to be tested)
This guarantees that we can always access the list of all the tested
events of a webhook. This feature will be later plumbed to marcos to
display all event types dynamically in doc.md.
JsonableError has two major benefits over json_error:
* It can be raised from anywhere in the codebase, rather than
being a return value, which is much more convenient for refactoring,
as one doesn't potentially need to change error handling style when
extracting a bit of view code to a function.
* It is guaranteed to contain the `code` property, which is helpful
for API consistency.
Various stragglers are not updated because JsonableError requires
subclassing in order to specify custom data or HTTP status codes.
This avoids calling parse_user_agent twice when dealing with official
Zulip clients, and also makes the logical flow hopefully easier to read.
We move get_client_name out of decorator.py, since it no longer
belongs there, and give it a nicer name.
This ensures it is present for all requests; while that was already
essentially true via process_client being called from every standard
decorator, this allows middleware and other code to rely on this
having been set.
django.utils.translation.ugettext is a deprecated alias of
django.utils.translation.gettext as of Django 3.0, and will be removed
in Django 4.0.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
In `validate_account_and_subdomain` we check
if user's realm is not deactivated. In case
of failure of this check, we raise our standard
JsonableError. While this works well in most
cases but it creates difficulties in handling
of users with deactivated realms for non-browser
clients.
So we register a new REALM_DEACTIVATED error
code so that clients can distinguish if error
is because of deactivated account. Following
these changes `validate_account_and_subdomain`
raises RealmDeactivatedError if user's realm
is deactivated.
This error is also documented in
`/api/rest-error-handling`.
Testing: I have mostly relied on automated
backend tests to test this.
Fixes#17763.
In validate_account_and_subdomain we check if
user's account is not deactivated. In case of
failure of this check we raise our standard
JsonableError. While this works well in most
cases but it creates difficulties in handling
of deactivated accounts for non-browser clients.
So we register a new USER_DEACTIVATED error
code so that clients can distinguish if error
is because of deactivated account. Following
these changes `validate_account_and_subdomain`
raises UserDeactivatedError if user's account
is deactivated.
This error is also documented in
`/api/rest-error-handling`.
Testing: I have mostly relied on automated
backend tests to test this.
Partially addresses issue #17763.
Using web_public_guest for anonymous users is confusing since
'guest' is actually a logged-in user compared to
web_public_guest which is not logged-in and has only
read access to messages. So, we rename it to
web_public_visitor.
For users who are not authenticated, we don't need to 2fa them,
we only need it once they are trying to login.
Tweaked by tabbott to be much more readable; the new style might
require new test coverage.
These represent known errors in what the user submitted. This is
slightly complicated by UnsupportedWebhookEventType being an instance
of JsonableError.
allow_webhook_access may be true if the request allows webhook
requests, regardless of if it only used for a webhook integration.
Only actually log to the verbose webhook logger if it is explicitly a
webhook endpoint, as judged by `webhook_client_name`. This prevents
requests for `POST /api/v1/messages` from being logged to the webhook
logger if they mistakenly contain a `payload` argument.
This argument does not define if an endpoint "is a webhook"; it is set
for "/api/v1/messages", which is not really a webhook, but allows
access from webhooks.
This clears it out of the data sent to Sentry, where it is duplicative
with the indexed metadata -- and potentially exposes PHI if Sentry's
"make this issue public" feature is used.
Anders Kaseorg
Eeshan Garg
Alex Vandiver
Aman Agrawal
PIG208
Mateusz Mandera
Tim Abbott
sahil839
orientor
m-e-l-u-h-a-n