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privsec.dev/content/apps/Update your Signal TLS Proxy.md

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---
title: "Update your Signal TLS Proxy"
date: 2022-10-15
tags: ['Applications', 'Linux', 'Container', 'Censorship Evasion']
author: Tommy
---
![Signal](/images/plz-merge.jpg)
Given the current censorship situation in Iran, I decided to have a look at the [Signal TLS Proxy](https://github.com/signalapp/Signal-TLS-Proxy).
One thing immediately jumped out - the NGINX image has not been updated [for years](https://github.com/signalapp/Signal-TLS-Proxy/blob/ac94d6b869f942ec05d7ef76840287a1d1f487f9/nginx-relay/Dockerfile#L9). In fact, NGINX 1.18 is so old that it has gone end of life [a year and a half](https://endoflife.date/nginx) as of this writing.
If you are thinking of deploying or maintaining a Signal TLS Proxy, I highly recommend that you use the upstream `nginx:alpine` image.
My Docker Compose setup can be found [here](https://github.com/tommytran732/Signal-TLS-Proxy). I have also fixed the missing `:Z` flag for mountpoints and and dropped privileges to reduce the attack surface there. I made a couple of pull requests for these changes, but Signal is taking their time to review and merge them, so... yeah.
- [Drop capabilities](https://github.com/signalapp/Signal-TLS-Proxy/pull/24)
- [Use upstream NGINX image](https://github.com/signalapp/Signal-TLS-Proxy/pull/23)
- [Add :Z for SELinux](https://github.com/signalapp/Signal-TLS-Proxy/pull/22)