cryptpad_ynh/conf/nginx.conf

set $main_domain "__DOMAIN__";
set $sandbox_domain "__SANDBOXDOMAIN__";
set $allowed_origins "https://${sandbox_domain}";
set $api_domain "__DOMAIN__";
set $files_domain "__DOMAIN__";
ssl_ecdh_curve secp384r1;

more_set_headers "X-XSS-Protection: 1; mode=block";
more_set_headers "X-Content-Type-Options: nosniff";
more_set_headers "Access-Control-Allow-Origin: ${allowed_origins}";
more_set_headers "Access-Control-Allow-Credentials: true";
# more_set_headers "X-Frame-Options: SAMEORIGIN";

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

# Insert the path to your CryptPad repository root here
root __INSTALL_DIR__/;
index index.html;
error_page 404 /customize.dist/404.html;

# any static assets loaded with "ver=" in their URL will be cached for a year
if ($args ~ ver=) {
    set $cacheControl max-age=31536000;
}
# This rule overrides the above caching directive and makes things somewhat less efficient.
# We had inverted them as an optimization, but Safari 16 introduced a bug that interpreted
# some important headers incorrectly when loading these files from cache.
# This is why we can't have nice things :(
if ($uri ~ ^(\/|.*\/|.*\.html)$) {
    set $cacheControl no-cache;
}

# Will not set any header if it is emptystring
more_set_headers "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.
more_set_headers "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";

location ^~ /cryptpad_websocket {
    proxy_pass http://127.0.0.1:__PORT__;
    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/.*$ {
    proxy_pass http://127.0.0.1:__PORT__;
    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;
    more_set_headers "Cross-Origin-Resource-Policy: cross-origin";
    proxy_hide_header Cross-Origin-Embedder-Policy;
    more_set_headers "Cross-Origin-Embedder-Policy: require-corp";
}

# Requests for blobs and blocks are now proxied to the API server
# This simplifies NGINX path configuration in the event they are being hosted in a non-standard location
# or with odd unexpected permissions. Serving blobs in this manner also means that it will be possible to
# enforce access control for them, though this is not yet implemented.
# Access control (via TOTP 2FA) has been added to blocks, so they can be handled with the same directives.
location ~ ^/(blob|block)/.*$ {
    if ($request_method = 'OPTIONS') {
        more_set_headers "Access-Control-Allow-Origin: ${allowed_origins}";
        more_set_headers "Access-Control-Allow-Credentials: true";
        more_set_headers "Access-Control-Allow-Methods: 'GET, POST, OPTIONS'";
        more_set_headers "Access-Control-Allow-Headers: DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range";
        more_set_headers "Access-Control-Max-Age: 1728000";
        more_set_headers "Content-Type: 'application/octet-stream; charset=utf-8'";
        more_set_headers "Content-Length: 0";
        return 204;
    }
    # Since we are proxying to the API server these headers can get duplicated
    # so we hide them
    proxy_hide_header 'X-Content-Type-Options';
    proxy_hide_header 'Access-Control-Allow-Origin';
    proxy_hide_header 'Permissions-Policy';
    proxy_hide_header 'X-XSS-Protection';
    proxy_hide_header 'Cross-Origin-Resource-Policy';
    proxy_hide_header 'Cross-Origin-Embedder-Policy';
    proxy_pass http://127.0.0.1:__PORT__;
}

# 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|recovery|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|diagram)$ {
    rewrite ^(.*)$ $1/ redirect;
}

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