a46f6df91e
Zulip writes a `rabbitmq.config` configuration file which locks down RabbitMQ to listen only on localhost:5672, as well as the RabbitMQ distribution port, on localhost:25672. The "distribution port" is part of Erlang's clustering configuration; while it is documented that the protocol is fundamentally insecure ([1], [2]) and can result in remote arbitrary execution of code, by default the RabbitMQ configuration on Debian and Ubuntu leaves it publicly accessible, with weak credentials. The configuration file that Zulip writes, while effective, is only written _after_ the package has been installed and the service started, which leaves the port exposed until RabbitMQ or system restart. Ensure that rabbitmq's `/etc/rabbitmq/rabbitmq.config` is written before rabbitmq is installed or starts, and that changes to that file trigger a restart of the service, such that the ports are only ever bound to localhost. This does not mitigate existing installs, since it does not force a rabbitmq restart. [1] https://www.erlang.org/doc/apps/erts/erl_dist_protocol.html [2] https://www.erlang.org/doc/reference_manual/distributed.html#distributed-erlang-system |
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README.md
Zulip overview
Zulip is an open-source team collaboration tool with unique topic-based threading that combines the best of email and chat to make remote work productive and delightful. Fortune 500 companies, leading open source projects, and thousands of other organizations use Zulip every day. Zulip is the only modern team chat app that is designed for both live and asynchronous conversations.
Zulip is built by a distributed community of developers from all around the world, with 74+ people who have each contributed 100+ commits. With over 1000 contributors merging over 500 commits a month, Zulip is the largest and fastest growing open source team chat project.
Getting started
Click on the appropriate link below. If nothing seems to apply, join us on the Zulip community server and tell us what's up!
You might be interested in:
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Contributing code. Check out our guide for new contributors to get started. Zulip prides itself on maintaining a clean and well-tested codebase, and a stock of hundreds of beginner-friendly issues.
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Contributing non-code. Report an issue, translate Zulip into your language, write for the Zulip blog, or give us feedback. We would love to hear from you, even if you're just trying the product out.
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Supporting Zulip. Advocate for your organization to use Zulip, become a sponsor, write a review in the mobile app stores, or upvote Zulip on product comparison sites.
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Checking Zulip out. The best way to see Zulip in action is to drop by the Zulip community server. We also recommend reading Zulip for open source, Zulip for companies, or Zulip for communities.
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Running a Zulip server. Use a preconfigured DigitalOcean droplet, install Zulip directly, or use Zulip's experimental Docker image. Commercial support is available; see https://zulip.com/plans for details.
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Using Zulip without setting up a server. https://zulip.com offers free and commercial hosting, including providing our paid plan for free to fellow open source projects.
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Participating in outreach programs like Google Summer of Code.
You may also be interested in reading our blog or following us on Twitter. Zulip is distributed under the Apache 2.0 license.