infrastructure/machines/public-cof/cryptpad.nix

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{ pkgs, ... }:
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let
subZone = "beta.rz.ens.wtf";
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main_domain = "pads.${subZone}";
sandbox_domain = "sandbox.${main_domain}";
# TODO: later
api_domain = "api.${main_domain}";
files_domain = "files.${main_domain}";
port = 3000;
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in
{
services.cryptpad = {
enable = true;
configFile = "/etc/cryptpad/config.js";
};
environment.etc."cryptpad/config.js".source = ./cryptpad.js;
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systemd.services.nginx = {
serviceConfig.BindReadOnlyPaths = [
"/var/lib/private/cryptpad:/www/cryptpad"
];
};
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services.nginx.virtualHosts = {
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"${main_domain}" = {
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forceSSL = true;
enableACME = true;
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serverAliases = [ sandbox_domain ];
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extraConfig = ''
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root ${pkgs.cryptpad}/lib/node_modules/cryptpad;
index index.html;
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# CryptPad serves static assets over these two domains.
# `main_domain` is what users will enter in their address bar.
# Privileged computation such as key management is handled in this scope
# UI content is loaded via the `sandbox_domain`.
# "Content Security Policy" headers prevent content loaded via the sandbox
# from accessing privileged information.
# These variables must be different to take advantage of CryptPad's sandboxing techniques.
# In the event of an XSS vulnerability in CryptPad's front-end code
# this will limit the amount of information accessible to attackers.
set $main_domain ${main_domain};
set $sandbox_domain ${sandbox_domain};
# CryptPad's dynamic content (websocket traffic and encrypted blobs)
# can be served over separate domains. Using dedicated domains (or subdomains)
# for these purposes allows you to move them to a separate machine at a later date
# if you find that a single machine cannot handle all of your users.
# If you don't use dedicated domains, this can be the same as $main_domain
# If you do, they'll be added as exceptions to any rules which block connections to remote domains.
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set $api_domain ${main_domain};
set $files_domain ${main_domain};
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server_name ${main_domain} ${sandbox_domain};
# CSS can be dynamically set inline, loaded from the same domain, or from $main_domain
set $styleSrc "'unsafe-inline' 'self' ${main_domain}";
# connect-src restricts URLs which can be loaded using script interfaces
set $connectSrc "'self' https://${main_domain} ${main_domain} https://${api_domain} blob: wss://${api_domain} ${api_domain} ${files_domain}";
# fonts can be loaded from data-URLs or the main domain
set $fontSrc "'self' data: ${main_domain}";
# images can be loaded from anywhere, though we'd like to deprecate this as it allows the use of images for tracking
set $imgSrc "'self' data: * blob: ${main_domain}";
# frame-src specifies valid sources for nested browsing contexts.
# this prevents loading any iframes from anywhere other than the sandbox domain
set $frameSrc "'self' ${sandbox_domain} blob:";
# specifies valid sources for loading media using video or audio
set $mediaSrc "'self' data: * blob: ${main_domain}";
# defines valid sources for webworkers and nested browser contexts
# deprecated in favour of worker-src and frame-src
set $childSrc "https://${main_domain}";
# specifies valid sources for Worker, SharedWorker, or ServiceWorker scripts.
# supercedes child-src but is unfortunately not yet universally supported.
set $workerSrc "https://${main_domain}";
# script-src specifies valid sources for javascript, including inline handlers
set $scriptSrc "'self' resource: ${main_domain}";
set $unsafe 0;
# the following assets are loaded via the sandbox domain
# they unfortunately still require exceptions to the sandboxing to work correctly.
if ($uri = "/pad/inner.html") { set $unsafe 1; }
if ($uri = "/sheet/inner.html") { set $unsafe 1; }
if ($uri ~ ^\/common\/onlyoffice\/.*\/index\.html.*$) { set $unsafe 1; }
# everything except the sandbox domain is a privileged scope, as they might be used to handle keys
if ($host != $sandbox_domain) { set $unsafe 0; }
# privileged contexts allow a few more rights than unprivileged contexts, though limits are still applied
if ($unsafe) {
set $scriptSrc "'self' 'unsafe-eval' 'unsafe-inline' resource: ${main_domain}";
}
# The nodejs process can handle all traffic whether accessed over websocket or as static assets
# We prefer to serve static content from nginx directly and to leave the API server to handle
# the dynamic content that only it can manage. This is primarily an optimization
location ^~ /cryptpad_websocket {
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proxy_pass http://localhost:${toString port};
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proxy_set_header X-Real-IP $remote_addr;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
# WebSocket support (nginx 1.4)
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection upgrade;
}
location ^~ /customize.dist/ {
# This is needed in order to prevent infinite recursion between /customize/ and the root
}
# try to load customizeable content via /customize/ and fall back to the default content
# located at /customize.dist/
# This is what allows you to override behaviour.
location ^~ /customize/ {
rewrite ^/customize/(.*)$ $1 break;
try_files /customize/$uri /customize.dist/$uri;
}
# /api/config is loaded once per page load and is used to retrieve
# the caching variable which is applied to every other resource
# which is loaded during that session.
location = /api/config {
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proxy_pass http://localhost:${toString port};
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proxy_set_header X-Real-IP $remote_addr;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
# encrypted blobs are immutable and are thus cached for a year
location ^~ /blob/ {
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root /www/cryptpad;
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if ($request_method = 'OPTIONS') {
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';
add_header 'Access-Control-Max-Age' 1728000;
add_header 'Content-Type' 'application/octet-stream; charset=utf-8';
add_header 'Content-Length' 0;
return 204;
}
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';
add_header 'Access-Control-Expose-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';
try_files $uri =404;
}
# the "block-store" serves encrypted payloads containing users' drive keys
# these payloads are unlocked via login credentials. They are mutable
# and are thus never cached. They're small enough that it doesn't matter, in any case.
location ^~ /block/ {
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root /www/cryptpad;
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add_header Cache-Control max-age=0;
try_files $uri =404;
}
# This block provides an alternative means of loading content
# otherwise only served via websocket. This is solely for debugging purposes,
# and is thus not allowed by default.
#location ^~ /datastore/ {
#add_header Cache-Control max-age=0;
#try_files $uri =404;
#}
# The nodejs server has some built-in forwarding rules to prevent
# URLs like /pad from resulting in a 404. This simply adds a trailing slash
# to a variety of applications.
location ~ ^/(register|login|settings|user|pad|drive|poll|slide|code|whiteboard|file|media|profile|contacts|todo|filepicker|debug|kanban|sheet|support|admin|notifications|teams)$ {
rewrite ^(.*)$ $1/ redirect;
}
# Finally, serve anything the above exceptions don't govern.
try_files /www/$uri /www/$uri/index.html /customize/$uri;
'';
};
};
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networking.firewall.allowedTCPPorts = [ 443 80 ];
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}