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cryptpad
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add a bunch of comments to all the mysterious sections of the nginx example config 

also remove a large, complicated, unnecessary section
This commit is contained in:
ansuz 2019-12-26 18:23:52 -05:00
parent c56815fa3b
commit 7c9b53695b
1 changed files with 71 additions and 28 deletions
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99
docs/example.nginx.conf
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@ -7,15 +7,29 @@
server {
listen 443 ssl http2;
# XXX These two variables
# 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 "your-main-domain.com";
set $sandbox_domain "your-sandbox-domain.com";
# The $api_domain and $files_domain are optional
# 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.
set $api_domain "api.your-main-domain.com";
set $files_domain "files.your-main-domain.com";
server_name $main_domain $sandbox_domain;
# nginx doesn't let you set server_name via variables, so you need to hardcode your domains here
server_name your-main-domain.com your-sandbox-domain.com;
ssl_certificate /home/cryptpad/.acme.sh/your-main-domain.com/fullchain.cer;
ssl_certificate_key /home/cryptpad/.acme.sh/your-main-domain.com/your-main-domain.com.key;
@ -38,33 +52,64 @@ server {
index index.html;
error_page 404 /customize.dist/404.html;
# any static assets loaded with "ver=" in their URL will be cached for a year
if ($args ~ ver=) {
set $cacheControl max-age=31536000;
}
# 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' ${main_domain}";
set $scriptSrc "'self' ${main_domain}";
# connect-src restricts URLs which can be loaded using script interfaces
set $connectSrc "'self' https://${main_domain} wss://${main_domain} $main_domain https://${api_domain} blob:";
# 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' ${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/web-apps/apps/spreadsheeteditor/main/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.cryptpad.info) { 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' ${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;";
# 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 $remote_addr;
@ -77,33 +122,20 @@ server {
proxy_set_header Connection upgrade;
}
location ^~ /datastore/ {
alias /home/cryptpad/office.cryptpad/data/datastore;
if ($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' 0;
add_header 'Content-Type' 'application/octet-stream; charset=utf-8';
add_header 'Content-Length' 0;
return 204;
}
add_header Cache-Control max-age=0;
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 $uri =404;
}
location ^~ /customize.dist/ {
# This is needed in order to prevent infinite recursion between /customize/ and the root
}
# try to load customizeable content via /customize/ and fall back to the default content
# located at /customize.dist/
# This is what allows you to override behaviour.
location ^~ /customize/ {
rewrite ^/customize/(.*)$ $1 break;
try_files /customize/$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 {
proxy_pass http://localhost:3000;
proxy_set_header X-Real-IP $remote_addr;
@ -111,24 +143,35 @@ server {
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
# encrypted blobs are immutable and are thus cached for a year
location ^~ /blob/ {
add_header Cache-Control max-age=31536000;
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 Cache-Control max-age=0;
try_files $uri =404;
}
location ^~ /datastore/ {
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;
}