dotfiles/nixos/boxes/vpsfree1/cryptpad.nix

{ config, pkgs, inputs, lib, ... }:

{

  imports = [ ../nginx.nix ];

  services.nginx = {
    virtualHosts = {
      "notes.purrfect.estate" = {
        forceSSL = true;
        enableACME = true;
        serverAliases = [ "notes-sandbox.purrfect.estate" ];
        extraConfig = ''
              set $main_domain "notes.purrfect.estate";
              set $sandbox_domain "notes-sandbox.purrfect.estate";

          # By default CryptPad allows remote domains to embed CryptPad documents in iframes.
          # This behaviour can be blocked by changing $allowed_origins from "*" to the
          # sandbox domain, which must be permitted to load content from the main domain
          # in order for CryptPad to work as expected.
          #
          # An example is given below which can be uncommented if you want to block
          # remote sites from including content from your server
              set $allowed_origins "*";
              set $allowed_origins "https://''${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 can be added as exceptions to any rules which block connections to remote domains.
          # You can find these variables referenced below in the relevant places
              set $api_domain "notes.purrfect.estate";
              set $files_domain "notes.purrfect.estate";

              add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
              add_header X-XSS-Protection "1; mode=block";
              add_header X-Content-Type-Options nosniff;
              add_header Access-Control-Allow-Origin "''${allowed_origins}";
          # add_header X-Frame-Options "SAMEORIGIN";

          # Opt out of Google's FLoC Network
              add_header Permissions-Policy interest-cohort=();

          # Enable SharedArrayBuffer in Firefox (for .xlsx export)
              add_header Cross-Origin-Resource-Policy cross-origin;
              add_header Cross-Origin-Embedder-Policy require-corp;

          # any static assets loaded with "ver=" in their URL will be cached for a year
              if ($args ~ ver=) {
                  set $cacheControl max-age=31536000;
              }
              if ($uri ~ ^/.*(\/|\.html)$) {
                  set $cacheControl no-cache;
              }
          # Will not set any header if it is emptystring
              add_header Cache-Control $cacheControl;

          # CSS can be dynamically set inline, loaded from the same domain, or from $main_domain
              set $styleSrc   "'unsafe-inline' 'self' https://''${main_domain}";

          # connect-src restricts URLs which can be loaded using script interfaces
          # if you have configured your instance to use a dedicated $files_domain or $api_domain
          # you will need to add them below as: https://''${files_domain} and https://''${api_domain}
              set $connectSrc "'self' https://''${main_domain} blob: wss://''${api_domain} https://''${sandbox_domain}";

          # fonts can be loaded from data-URLs or the main domain
              set $fontSrc    "'self' data: https://''${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 $imgSrc     "'self' data: blob: https://''${main_domain}";

          # frame-src specifies valid sources for nested browsing contexts.
          # this prevents loading any iframes from anywhere other than the sandbox domain
              set $frameSrc   "'self' https://''${sandbox_domain} blob:";

          # specifies valid sources for loading media using video or audio
              set $mediaSrc   "blob:";

          # 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  "'self'";

          # script-src specifies valid sources for javascript, including inline handlers
              set $scriptSrc  "'self' resource: https://''${main_domain}";

          # frame-ancestors specifies which origins can embed your CryptPad instance
          # this must include 'self' and your main domain (over HTTPS) in order for CryptPad to work
          # if you have enabled remote embedding via the admin panel then this must be more permissive.
          # note: cryptpad.fr permits web pages served via https: and vector: (element desktop app)
              set $frameAncestors "'self' https://''${main_domain}";
          # set $frameAncestors "'self' https: vector:";

              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 ~ ^\/(sheet|doc|presentation)\/inner.html.*$) { set $unsafe 1; }
              if ($uri ~ ^\/common\/onlyoffice\/.*\/.*\.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 $unsafe 0; }
          # this iframe is an exception. Office file formats are converted outside of the sandboxed scope
          # because of bugs in Chromium-based browsers that incorrectly ignore headers that are supposed to enable
          # the use of some modern APIs that we require when javascript is run in a cross-origin context.
          # We've applied other sandboxing techniques to mitigate the risk of running WebAssembly in this privileged scope
              if ($uri ~ ^\/unsafeiframe\/inner\.html.*$) { set $unsafe 1; }

          # privileged contexts allow a few more rights than unprivileged contexts, though limits are still applied
              if ($unsafe) {
                  set $scriptSrc "'self' 'unsafe-eval' 'unsafe-inline' resource: https://''${main_domain}";
              }

          # Finally, set all the rules you composed above.
              add_header Content-Security-Policy "default-src 'none'; child-src $childSrc; worker-src $workerSrc; media-src $mediaSrc; style-src $styleSrc; script-src $scriptSrc; connect-src $connectSrc; font-src $fontSrc; img-src $imgSrc; frame-src $frameSrc; frame-ancestors $frameAncestors";

          # 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 {
                  proxy_pass http://localhost:3000;
                  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;
              add_header Content-Security-Policy "default-src 'none'; child-src $childSrc; worker-src $workerSrc; media-src $mediaSrc; style-src $styleSrc; script-src $scriptSrc; connect-src $connectSrc; font-src $fontSrc; img-src $imgSrc; frame-src $frameSrc; frame-ancestors $frameAncestors";
              add_header X-XSS-Protection "1; mode=block";
              add_header Cache-Control $cacheControl;
              add_header X-Content-Type-Options nosniff;
              }

              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/.*$ {
                  proxy_pass http://localhost:3000;
                  proxy_set_header X-Real-IP $remote_addr;
                  proxy_set_header Host $host;
                  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

          # These settings prevent both NGINX and the API server
          # from setting the same headers and creating duplicates
                  proxy_hide_header Cross-Origin-Resource-Policy;
                  add_header Cross-Origin-Resource-Policy cross-origin;
                  proxy_hide_header Cross-Origin-Embedder-Policy;
                  add_header Cross-Origin-Embedder-Policy require-corp;
              add_header Content-Security-Policy "default-src 'none'; child-src $childSrc; worker-src $workerSrc; media-src $mediaSrc; style-src $styleSrc; script-src $scriptSrc; connect-src $connectSrc; font-src $fontSrc; img-src $imgSrc; frame-src $frameSrc; frame-ancestors $frameAncestors";
              add_header X-XSS-Protection "1; mode=block";
              add_header Cache-Control $cacheControl;
              add_header X-Content-Type-Options nosniff;
              }

          # encrypted blobs are immutable and are thus cached for a year
              location ^~ /blob/ {
                  if ($request_method = 'OPTIONS') {
                      add_header 'Access-Control-Allow-Origin' "''${allowed_origins}";
                      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;
              add_header Content-Security-Policy "default-src 'none'; child-src $childSrc; worker-src $workerSrc; media-src $mediaSrc; style-src $styleSrc; script-src $scriptSrc; connect-src $connectSrc; font-src $fontSrc; img-src $imgSrc; frame-src $frameSrc; frame-ancestors $frameAncestors";
              add_header X-XSS-Protection "1; mode=block";
              add_header Cache-Control $cacheControl;
              add_header X-Content-Type-Options nosniff;
                      return 204;
                  }
                  add_header X-Content-Type-Options nosniff;
                  add_header Cache-Control max-age=31536000;
                  add_header 'Access-Control-Allow-Origin' "''${allowed_origins}";
                  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,Content-Length';
                  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,Content-Length';
              add_header Content-Security-Policy "default-src 'none'; child-src $childSrc; worker-src $workerSrc; media-src $mediaSrc; style-src $styleSrc; script-src $scriptSrc; connect-src $connectSrc; font-src $fontSrc; img-src $imgSrc; frame-src $frameSrc; frame-ancestors $frameAncestors";
              add_header X-XSS-Protection "1; mode=block";
              add_header Cache-Control $cacheControl;
              add_header X-Content-Type-Options nosniff;
                  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/ {
                  add_header X-Content-Type-Options nosniff;
                  add_header Cache-Control max-age=0;
              add_header Content-Security-Policy "default-src 'none'; child-src $childSrc; worker-src $workerSrc; media-src $mediaSrc; style-src $styleSrc; script-src $scriptSrc; connect-src $connectSrc; font-src $fontSrc; img-src $imgSrc; frame-src $frameSrc; frame-ancestors $frameAncestors";
              add_header X-XSS-Protection "1; mode=block";
              add_header X-Content-Type-Options nosniff;
                  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|calendar|presentation|doc|form|report|convert|checkup)$ {
                  rewrite ^(.*)$ $1/ redirect;
              }

          # Finally, serve anything the above exceptions don't govern.
              try_files /www/$uri /www/$uri/index.html /customize/$uri;
        '';
      };
    };
  };

  virtualisation.oci-containers.containers.cryptpad = {
    image = "promasu/cryptpad";
    ports = [ "9005:3000" "9006:3001" ];
    volumes = [ "${./cryptpad.config.js}:/cryptpad/config/config.js" ];
  };

}