138 lines
4.2 KiB
Markdown
138 lines
4.2 KiB
Markdown
# Authenticating proxy
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NOTE: This connector is experimental and may change in the future.
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## Overview
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The `authproxy` connector returns identities based on authentication which your
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front-end web server performs. Dex consumes the `X-Remote-User` header set by
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the proxy, which is then used as the user's email address.
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__The proxy MUST remove any `X-Remote-*` headers set by the client, for any URL
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path, before the request is forwarded to dex.__
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The connector does not support refresh tokens or groups.
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## Configuration
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The `authproxy` connector is used by proxies to implement login strategies not
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supported by dex. For example, a proxy could handle a different OAuth2 strategy
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such as Slack. The connector takes no configuration other than a `name` and `id`:
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```yaml
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connectors:
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# Slack login implemented by an authenticating proxy, not by dex.
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- type: authproxy
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id: slack
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name: Slack
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```
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The proxy only needs to authenticate the user when they attempt to visit the
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callback URL path:
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```
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( dex issuer URL )/callback/( connector id )?( url query )
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```
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For example, if dex is running at `https://auth.example.com/dex` and the connector
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ID is `slack`, the callback URL would look like:
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```
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https://auth.example.com/dex/callback/slack?state=xdg3z6quhrhwaueo5iysvliqf
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```
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The proxy should login the user then return them to the exact URL (inlucing the
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query), setting `X-Remote-User` to the user's email before proxying the request
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to dex.
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## Configuration example - Apache 2
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The following is an example config file that can be used by the external
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connector to authenticate a user.
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```yaml
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connectors:
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- type: authproxy
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id: myBasicAuth
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name: HTTP Basic Auth
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```
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The authproxy connector assumes that you configured your front-end web server
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such that it performs authentication for the `/dex/callback/myBasicAuth`
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location and provides the result in the X-Remote-User HTTP header. The following
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configuration will work for Apache 2.4.10+:
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```
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<Location /dex/>
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ProxyPass "http://localhost:5556/dex/"
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ProxyPassReverse "http://localhost:5556/dex/"
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# Strip the X-Remote-User header from all requests except for the ones
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# where we override it.
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RequestHeader unset X-Remote-User
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</Location>
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<Location /dex/callback/myBasicAuth>
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AuthType Basic
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AuthName "db.debian.org webPassword"
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AuthBasicProvider file
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AuthUserFile "/etc/apache2/debian-web-pw.htpasswd"
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Require valid-user
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# Defense in depth: clear the Authorization header so that
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# Debian Web Passwords never even reach dex.
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RequestHeader unset Authorization
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# Requires Apache 2.4.10+
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RequestHeader set X-Remote-User expr=%{REMOTE_USER}@debian.org
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ProxyPass "http://localhost:5556/dex/callback/myBasicAuth"
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ProxyPassReverse "http://localhost:5556/dex/callback/myBasicAuth"
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</Location>
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```
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## Full Apache2 setup
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After installing your Linux distribution’s Apache2 package, place the following
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virtual host configuration in e.g. `/etc/apache2/sites-available/sso.conf`:
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```
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<VirtualHost sso.example.net>
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ServerName sso.example.net
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ServerAdmin webmaster@localhost
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DocumentRoot /var/www/html
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ErrorLog ${APACHE_LOG_DIR}/error.log
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CustomLog ${APACHE_LOG_DIR}/access.log combined
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<Location /dex/>
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ProxyPass "http://localhost:5556/dex/"
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ProxyPassReverse "http://localhost:5556/dex/"
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# Strip the X-Remote-User header from all requests except for the ones
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# where we override it.
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RequestHeader unset X-Remote-User
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</Location>
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<Location /dex/callback/myBasicAuth>
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AuthType Basic
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AuthName "db.debian.org webPassword"
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AuthBasicProvider file
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AuthUserFile "/etc/apache2/debian-web-pw.htpasswd"
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Require valid-user
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# Defense in depth: clear the Authorization header so that
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# Debian Web Passwords never even reach dex.
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RequestHeader unset Authorization
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# Requires Apache 2.4.10+
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RequestHeader set X-Remote-User expr=%{REMOTE_USER}@debian.org
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ProxyPass "http://localhost:5556/dex/callback/myBasicAuth"
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ProxyPassReverse "http://localhost:5556/dex/callback/myBasicAuth"
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</Location>
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</VirtualHost>
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```
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Then, enable it using `a2ensite sso.conf`, followed by a restart of Apache2.
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