navsection: installguide
title: Install Keep-web server
...
+{% comment %}
+Copyright (C) The Arvados Authors. All rights reserved.
-The Keep-web server provides read-only HTTP access to files stored in Keep. It serves public data to unauthenticated clients, and serves private data to clients that supply Arvados API tokens. It can be installed anywhere with access to Keep services, typically behind a web proxy that provides SSL support. See the "godoc page":http://godoc.org/github.com/curoverse/arvados/services/keep-web for more detail.
+SPDX-License-Identifier: CC-BY-SA-3.0
+{% endcomment %}
-By convention, we use the following hostnames for the Keep-web service:
+# "Introduction":#introduction
+# "Configure DNS":#introduction
+# "Configure anonymous user token.yml":#update-config
+# "Update nginx configuration":#update-nginx
+# "Install keep-web package":#install-packages
+# "Start the service":#start-service
+# "Restart the API server and controller":#restart-api
+# "Confirm working installation":#confirm-working
+
+h2(#introduction). Introduction
+
+The Keep-web server provides read/write HTTP (WebDAV) access to files stored in Keep. This makes it easy to access files in Keep from a browser, or mount Keep as a network folder using WebDAV support in various operating systems. It serves public data to unauthenticated clients, and serves private data to clients that supply Arvados API tokens. It can be installed anywhere with access to Keep services, typically behind a web proxy that provides TLS support. See the "godoc page":http://godoc.org/github.com/curoverse/arvados/services/keep-web for more detail.
+
+h2(#dns). Configure DNS
+
+It is important to properly configure the keep-web service to so it does not open up cross-site-scripting (XSS) attacks. A HTML file can be stored in collection. If an attacker causes a victim to visit that HTML file through Workbench, it will be rendered by the browser. If all collections are served at the same domain, the browser will consider collections as coming from the same origin and thus have access to the same browsing data (such as API token), enabling malicious Javascript in the HTML file to access Arvados as the victim.
+
+There are two approaches to mitigate this.
+
+# The service can tell the browser that all files should go to download instead of in-browser preview, except in situations where an attacker is unlikely to be able to gain access to anything they didn't already have access to.
+# Each each collection served by @keep-web@ is served on its own virtual host. This allows for file with executable content to be displayed in-browser securely. The virtual host embeds the collection uuid or portable data hash in the hostname. For example, a collection with uuid @xxxxx-4zz18-tci4vn4fa95w0zx@ could be served as @xxxxx-4zz18-tci4vn4fa95w0zx.collections.ClusterID.example.com@ . The portable data hash @dd755dbc8d49a67f4fe7dc843e4f10a6+54@ could be served at @dd755dbc8d49a67f4fe7dc843e4f10a6-54.collections.ClusterID.example.com@ . This requires "wildcard DNS record":https://en.wikipedia.org/wiki/Wildcard_DNS_record and "wildcard TLS certificate.":https://en.wikipedia.org/wiki/Wildcard_certificate
+
+h3. Collections download URL
+
+Downloads links will served from the the URL in @Services.WebDAVDownload.ExternalURL@ . The collection uuid or PDH is put in the URL path.
+
+If blank, serve links to WebDAV with @disposition=attachment@ query param. Unlike preview links, browsers do not render attachments, so there is no risk of XSS.
+
+If @WebDAVDownload@ is blank, and @WebDAV@ has a single origin (not wildcard, see below), then Workbench will show an error page
<notextile>
-<pre><code>download.<span class="userinput">uuid_prefix</span>.your.domain
-collections.<span class="userinput">uuid_prefix</span>.your.domain
-*.collections.<span class="userinput">uuid_prefix</span>.your.domain
+<pre><code> Services:
+ WebDAVDownload:
+ ExternalURL: https://<span class="userinput">download.ClusterID.example.com</span>
</code></pre>
</notextile>
-The above hostnames should resolve from anywhere on the internet.
+h3. Collections preview URL
-h2. Install Keep-web
+Collections will be served using the URL pattern in @Services.WebDAV.ExternalURL@ . If blank, use @Services.WebDAVDownload.ExternalURL@ instead, and disable inline preview. If both are empty, downloading collections from workbench will be impossible. When wildcard domains configured, credentials are still required to access non-public data.
-Typically Keep-web runs on the same host as Keepproxy.
+h4. In their own subdomain
-On Debian-based systems:
+Collections can be served from their own subdomain:
<notextile>
-<pre><code>~$ <span class="userinput">sudo apt-get install keep-web</span>
+<pre><code> Services:
+ WebDAV:
+ ExternalURL: https://<span class="userinput">*.collections.ClusterID.example.com/</span>
</code></pre>
</notextile>
-On Red Hat-based systems:
+h4. Under the main domain
+
+Alternately, they can go under the main domain by including @--@:
<notextile>
-<pre><code>~$ <span class="userinput">sudo yum install keep-web</span>
+<pre><code> Services:
+ WebDAV:
+ ExternalURL: https://<span class="userinput">*--collections.ClusterID.example.com/</span>
</code></pre>
</notextile>
-Verify that @Keep-web@ is functional:
+h4. From a single domain
+
+Serve preview links from a single domain, setting uuid or pdh in the path (similar to downloads). This configuration only allows previews of public data (data accessible by the anonymous user) and collection-sharing links (where the token is already embedded in the URL); it will ignore authorization headers, so a request for non-public data may return "404 Not Found" even if normally valid credentials were provided.
<notextile>
-<pre><code>~$ <span class="userinput">keep-web -h</span>
-Usage of keep-web:
- -allow-anonymous
- Serve public data to anonymous clients. Try the token supplied in the ARVADOS_API_TOKEN environment variable when none of the tokens provided in an HTTP request succeed in reading the desired collection. (default false)
- -attachment-only-host string
- Accept credentials, and add "Content-Disposition: attachment" response headers, for requests at this hostname:port. Prohibiting inline display makes it possible to serve untrusted and non-public content from a single origin, i.e., without wildcard DNS or SSL.
- -listen string
- Address to listen on: "host:port", or ":port" to listen on all interfaces. (default ":80")
- -trust-all-content
- Serve non-public content from a single origin. Dangerous: read docs before using!
+<pre><code> Services:
+ WebDAV:
+ ExternalURL: https://<span class="userinput">collections.ClusterID.example.com/</span>
</code></pre>
</notextile>
-{% assign railscmd = "bundle exec ./script/get_anonymous_user_token.rb" %}
-{% assign railsout = "zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz" %}
-If you intend to use Keep-web to serve public data to anonymous clients, configure it with an anonymous token. You can use the same one you used when you set up your Keepproxy server, or use the following command on the <strong>API server</strong> to create another. {% include 'install_rails_command' %}
-
-Install runit to supervise the Keep-web daemon. {% include 'install_runit' %}
+Note the trailing slash.
-The basic command to start Keep-web in the service run script is:
+h2. Set InternalURLs
<notextile>
-<pre><code>export ARVADOS_API_HOST=<span class="userinput">uuid_prefix</span>.your.domain
-export ARVADOS_API_TOKEN="<span class="userinput">{{railsout}}</span>"
-exec sudo -u nobody keep-web \
- -listen=<span class="userinput">:9002</span> \
- -attachment-only-host=<span class="userinput">download.uuid_prefix.your.domain</span> \
- -allow-anonymous \
- 2>&1
+<pre><code> Services:
+ WebDAV:
+ InternalURLs:
+ http://<span class="userinput">localhost:9002</span>: {}
</code></pre>
</notextile>
-Omit the @-allow-anonymous@ argument if you do not want to serve public data.
+h2(#update-config). Configure anonymous user token
-Set @ARVADOS_API_HOST_INSECURE=1@ if your API server's SSL certificate is not signed by a recognized CA.
+{% assign railscmd = "bundle exec ./script/get_anonymous_user_token.rb --get" %}
+{% assign railsout = "zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz" %}
+If you intend to use Keep-web to serve public data to anonymous clients, configure it with an anonymous token. Use the following command on the <strong>API server</strong> to create an anonymous user token. {% include 'install_rails_command' %}
-h3. Set up a reverse proxy with SSL support
+<notextile>
+<pre><code> Users:
+ AnonymousUserToken: <span class="userinput">"{{railsout}}"</span>
+</code></pre>
+</notextile>
-The Keep-web service will be accessible from anywhere on the internet, so we recommend using SSL for transport encryption.
+Set @Users.AnonymousUserToken: ""@ (empty string) or leave it out if you do not want to serve public data.
-This is best achieved by putting a reverse proxy with SSL support in front of Keep-web, running on port 443 and passing requests to Keep-web on port 9002 (or whatever port you chose in your run script).
+h3. Update nginx configuration
-Note: A wildcard SSL certificate is required in order to support a full-featured secure Keep-web service. Without it, Keep-web can offer file downloads for all Keep data; however, in order to avoid cross-site scripting vulnerabilities, Keep-web refuses to serve private data as web content except when it is accessed using a "secret link" share. With a wildcard SSL certificate and DNS configured appropriately, all data can be served as web content.
+Put a reverse proxy with SSL support in front of keep-web. Keep-web itself runs on the port 25107 (or whatever is specified in @Services.Keepproxy.InternalURL@) the reverse proxy runs on port 443 and forwards requests to Keepproxy.
-For example, using Nginx:
+Use a text editor to create a new file @/etc/nginx/conf.d/keep-web.conf@ with the following configuration. Options that need attention are marked in <span class="userinput">red</span>.
<notextile><pre>
upstream keep-web {
}
server {
- listen <span class="userinput">[your public IP address]</span>:443 ssl;
- server_name download.<span class="userinput">uuid_prefix</span>.your.domain
- collections.<span class="userinput">uuid_prefix</span>.your.domain
- *.collections.<span class="userinput">uuid_prefix</span>.your.domain
- ~.*--collections.<span class="userinput">uuid_prefix</span>.your.domain;
+ listen 443 ssl;
+ server_name <span class="userinput">download.ClusterID.example.com</span>
+ <span class="userinput">collections.ClusterID.example.com</span>
+ <span class="userinput">*.collections.ClusterID.example.com</span>
+ <span class="userinput">~.*--collections.ClusterID.example.com</span>;
proxy_connect_timeout 90s;
proxy_read_timeout 300s;
ssl on;
- ssl_certificate <span class="userinput"/>YOUR/PATH/TO/cert.pem</span>;
- ssl_certificate_key <span class="userinput"/>YOUR/PATH/TO/cert.key</span>;
+ ssl_certificate <span class="userinput">/YOUR/PATH/TO/cert.pem</span>;
+ ssl_certificate_key <span class="userinput">/YOUR/PATH/TO/cert.key</span>;
location / {
proxy_pass http://keep-web;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+
+ client_max_body_size 0;
+ proxy_http_version 1.1;
+ proxy_request_buffering off;
}
}
</pre></notextile>
{% include 'notebox_begin' %}
-If you restrict access to your Arvados services based on network topology -- for example, your proxy server is not reachable from the public internet -- additional proxy configuration might be needed to thwart cross-site scripting attacks that would circumvent your restrictions. Read the "'Intranet mode' section of the Keep-web documentation":https://godoc.org/github.com/curoverse/arvados/services/keep-web#hdr-Intranet_mode now.
+If you restrict access to your Arvados services based on network topology -- for example, your proxy server is not reachable from the public internet -- additional proxy configuration might be needed to thwart cross-site scripting attacks that would circumvent your restrictions.
+
+Normally, Keep-web accepts requests for multiple collections using the same host name, provided the client's credentials are not being used. This provides insufficient XSS protection in an installation where the "anonymously accessible" data is not truly public, but merely protected by network topology.
+
+In such cases -- for example, a site which is not reachable from the internet, where some data is world-readable from Arvados's perspective but is intended to be available only to users within the local network -- the downstream proxy should configured to return 401 for all paths beginning with "/c="
{% include 'notebox_end' %}
-h3. Configure DNS
+{% assign arvados_component = 'keep-web' %}
-Configure your DNS servers so the following names resolve to your Nginx proxy's public IP address.
-* @download.uuid_prefix.your.domain@
-* @collections.uuid_prefix.your.domain@
-* @*--collections.uuid_prefix.your.domain@, if you have a wildcard SSL certificate valid for @*.uuid_prefix.your.domain@ and your DNS server allows this without interfering with other DNS names.
-* @*.collections.uuid_prefix.your.domain@, if you have a wildcard SSL certificate valid for these names.
+{% include 'install_packages' %}
-If neither of the above wildcard options is feasible, you have two choices:
-# Serve web content at @collections.uuid_prefix.your.domain@, but only for unauthenticated requests (public data and collection sharing links). Authenticated requests will always result in file downloads, using the @download@ name. For example, the Workbench "preview" button and the "view entire log file" link will invoke file downloads instead of displaying content in the browser window.
-# In the special case where you know you are immune to XSS exploits, you can enable the "trust all content" mode in Keep-web (with the @-trust-all-content@ command line flag) and Workbench (with the @trust_all_content@ item in @application.yml@). With both of these enabled, inline web content can be served from a single @collections@ host name; no wildcard DNS or certificate is needed. Do not do this without understanding the security implications described in the "Keep-web documentation":http://godoc.org/github.com/curoverse/arvados/services/keep-web.
+{% include 'start_service' %}
-h3. Tell Workbench about the Keep-web service
+{% include 'restart_api' %}
-Workbench has features like "download file from collection" and "show image" which work better if the content is served by Keep-web rather than Workbench itself. We recommend using the two different hostnames ("download" and "collections" above) for file downloads and inline content respectively.
+h2(#confirm-working). Confirm working installation
-Add the following entry to your Workbench configuration file (@/etc/arvados/workbench/application.yml@). This URL will be used for file downloads.
+<notextile><code><pre>
+$ curl -H "Authorization: Bearer $system_root_token" https://<span class="userinput">download.ClusterID.example.com</span>/c=59389a8f9ee9d399be35462a0f92541c-53/_/hello.txt
+</code></pre></notextile>
-<notextile>
-<pre><code>keep_web_download_url: https://download.<span class="userinput">uuid_prefix</span>.your.domain/c=%{uuid_or_pdh}
-</code></pre>
-</notextile>
+If wildcard collections domains are configured:
-Additionally, add *one* of the following entries to your Workbench configuration file, depending on your DNS setup. This URL will be used to serve user content that can be displayed in the browser, like image previews and static HTML pages.
+<notextile><code><pre>
+$ curl -H "Authorization: Bearer $system_root_token" https://<span class="userinput">59389a8f9ee9d399be35462a0f92541c-53.collections.ClusterID.example.com</span>/hello.txt
+</code></pre></notextile>
-<notextile>
-<pre><code>keep_web_url: https://%{uuid_or_pdh}--collections.<span class="userinput">uuid_prefix</span>.your.domain
-keep_web_url: https://%{uuid_or_pdh}.collections.<span class="userinput">uuid_prefix</span>.your.domain
-keep_web_url: https://collections.<span class="userinput">uuid_prefix</span>.your.domain/c=%{uuid_or_pdh}
-</code></pre>
-</notextile>
+If using a single collections preview domain:
+
+<notextile><code><pre>
+$ curl https://<span class="userinput">collections.ClusterID.example.com</span>/c=59389a8f9ee9d399be35462a0f92541c-53/t=$system_root_token/_/hello.txt
+</code></pre></notextile>
projects / arvados.git / blobdiff