Our recent addition of Content-Security-Policy to the file uploads
backend broke in-browser previews of PDFs.
The content-types change in the last commit fixed loading PDFs for
most users; but the result was ugly, because e.g. Chrome would put the
PDF previewer into a frame (so there were 2 left scrollbars).
There were two changes needed to fix this:
* Loading the style to use the plugin. We corrected this by adding
`style-src 'self' 'unsafe-inline';`
* Loading the plugin. Our CSP blocked loading the PDf viewer plugin.
To correct this, we add object-src 'self', and then limit the
plugin-type to just the one for application/pdf.
We verified this new CSP using https://csp-evaluator.withgoogle.com/
in addition to manual testing.
Previously, user-uploaded PDF files were not properly rendered by
browsers with the local uploads backend, because we weren't setting
the correct content-type.
This adds a basic Content-Security-Policy for user-uploaded avatars
served by the LOCAL_UPLOADS backend.
I think this is for now an unnecessary follow-up to
d608a9d315, but is worth doing because
we may later change what can be uploaded in the avatars directory.
This adds a basic Content-Security-Policy for user-uploaded files with local uploads.
While over time, we plan to add CSP for the main site as well, this CSP is particularly
important for the local-uploads backend, which often shares a domain with the main site.
Running this on additional machines would be redundant; additionally,
the FillState checker cron job runs only on cron systems, so this will
crash on other app frontends.
While this is a different system than I'd written up in #8004, I think
this is a better solution to the general problem of cron jobs to run
on just one server.
Fixes#8004.
Revert c8f034e9a "queue: Remove missedmessage_email_senders code."
As the comment in the code says, it ensures a smooth upgrade path
from 1.7.x; we can delete it in master after 1.8.0 is released.
The removal commit was merged early due to a communication failure.
From here on we start to authenticate uploaded file request before
serving this files in production. This involves allowing NGINX to
pass on these file requests to Django for authentication and then
serve these files by making use on internal redirect requests having
x-accel-redirect field. The redirection on requests and loading
of x-accel-redirect param is handled by django-sendfile.
NOTE: This commit starts to authenticate these requests for Zulip
servers running platforms either Ubuntu Xenial (16.04) or above.
Fixes: #320 and #291 partially.
This should make it possible to use the zulip_ops base rules
successfully on chat.zulip.org. Many of the changes in this commit
are hacks and probably can be cleaned up later, but given that we plan
to drop trusty support soon, it's likely that most of them will simply
be deleted then.
We've been running this change on zulipchat.com for a couple of months
now. Before then, we used to regularly get exceptions like this:
File "./zerver/views/messages.py", line 749, in get_messages_backend
setter=stringify_message_dict)
File "./zerver/lib/cache.py", line 275, in generic_bulk_cached_fetch
cache_set_many(items_for_remote_cache)
File "./zerver/lib/cache.py", line 215, in cache_set_many
get_cache_backend(cache_name).set_many(items, timeout=timeout)
File "/home/zulip/deployments/2017-09-28-21-04-12/zulip-py3-venv/lib/python3.5/site-packages/django/core/cache/backends/memcached.py", line 150, in set_many
self._cache.set_multi(safe_data, self.get_backend_timeout(timeout))
pylibmc.Error: error 48 from memcached_set_multi
This error means memcached was unable to find space for the new value.
You might think that because memcached provides an LRU cache, this
shouldn't happen because it would just evict something... but in fact
* memcached splits its data into "slabs" by object size, and
* until recently, once a 1MiB "chunk" is allocated to a given "slab"
i.e. size class, it wouldn't be reclaimed to allocate to another.
So once the cache has been filled up with objects of some distribution
of sizes, if some objects come in that would go in a different size
class, we have no chunks for that size class / slab, and can't get one.
And that's exactly what was happening on zulipchat.com.
Useful background can be found in
https://github.com/memcached/memcached/wiki/ServerMaint#slab-imbalancehttps://github.com/memcached/memcached/wiki/ReleaseNotes1411https://github.com/memcached/memcached/wiki/ReleaseNotes1425https://github.com/memcached/memcached/wiki/ReleaseNotes150
We're already running v1.4.25, which provides an "automover" that should
be well equipped to fix this; v1.5.0 turns it on by default.
With this commit, adopt the "modern start line" recommended in the
release notes for our v1.4.25, including turning on the automover.
This doesn't yet pass all Nagios checks correctly, and still has a few
flaws:
* The ideal setup code for the `nagios` user in the database isn't included.
* Some of the other details are a bit off; we need to split some host roles.
But it's better than nothing, and we can iterate from here.
This commit just copies all the code from MissedMessageSendingWorker
class to a new EmailSendingWorker class. All the logic to send an email
through a queue was already there. This commit only makes the logic
generic. It does so by creating a special purpose queue called
'email_senders' to send any type of email. To make
MissedMessageSendingWorker still work we derive it from
EmailSendingWorker. All the tests that were testing
MissedMessageSendingWorker now run against EmailSendingWorker.
This fixes a bug where, when a user is unsubscribed from a stream,
they might have unread messages on that stream leak. While it might
seem to be a minor problem, it can cause significant problems for
computing the `unread_msgs` data structures, since it means we need to
add an extra filter for whether the user is still subscribed, either
in the backend or in the UI.
Fixes#7095.
This causes the cron job to run only when a Zulip-managed certbot
install is actually set up.
Inside `install`, zulip.conf doesn't yet exist when we run
setup-certbot, so we write the setting later. But we also give
setup-certbot the ability to write the setting itself, so that we
can recommend it in instructions for adopting certbot in an
existing Zulip installation.
If we were making an old-fashioned webroot where hand-written static
HTML files went, somewhere under `/srv` would be most appropriate.
Here, this webroot is really more of an implementation detail of the
certbot set up by the Zulip installer/packaging, containing transient
state. So someplace under `/var` is appropriate, and specifically
under `/var/lib/zulip` in order to properly namespace it.
For background on `/var/www` and friends, see the top couple of answers
on
https://unix.stackexchange.com/questions/47436/why-web-server-var-www
