211 lines
6 KiB
Markdown
211 lines
6 KiB
Markdown
---
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description: Restricting access to your registry using an apache proxy
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keywords: registry, on-prem, images, tags, repository, distribution, authentication, proxy, apache, httpd, TLS, recipe, advanced
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title: Authenticate proxy with apache
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---
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{% include registry.md %}
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## Use-case
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People already relying on an apache proxy to authenticate their users to other services might want to leverage it and have Registry communications tunneled through the same pipeline.
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Usually, that includes enterprise setups using LDAP/AD on the backend and a SSO mechanism fronting their internal http portal.
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### Alternatives
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If you just want authentication for your registry, and are happy maintaining users access separately, you should really consider sticking with the native [basic auth registry feature](../deploying.md#native-basic-auth).
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### Solution
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With the method presented here, you implement basic authentication for docker engines in a reverse proxy that sits in front of your registry.
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While we use a simple htpasswd file as an example, any other apache authentication backend should be fairly easy to implement once you are done with the example.
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We also implement push restriction (to a limited user group) for the sake of the example. Again, you should modify this to fit your mileage.
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### Gotchas
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While this model gives you the ability to use whatever authentication backend you want through the secondary authentication mechanism implemented inside your proxy, it also requires that you move TLS termination from the Registry to the proxy itself.
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Furthermore, introducing an extra http layer in your communication pipeline adds complexity when deploying, maintaining, and debugging.
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## Setting things up
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Read again [the requirements](index.md#requirements).
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Ready?
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Run the following script:
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```
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mkdir -p auth
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mkdir -p data
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# This is the main apache configuration
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cat <<EOF > auth/httpd.conf
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LoadModule headers_module modules/mod_headers.so
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LoadModule authn_file_module modules/mod_authn_file.so
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LoadModule authn_core_module modules/mod_authn_core.so
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LoadModule authz_groupfile_module modules/mod_authz_groupfile.so
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LoadModule authz_user_module modules/mod_authz_user.so
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LoadModule authz_core_module modules/mod_authz_core.so
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LoadModule auth_basic_module modules/mod_auth_basic.so
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LoadModule access_compat_module modules/mod_access_compat.so
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LoadModule log_config_module modules/mod_log_config.so
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LoadModule ssl_module modules/mod_ssl.so
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LoadModule proxy_module modules/mod_proxy.so
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LoadModule proxy_http_module modules/mod_proxy_http.so
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LoadModule unixd_module modules/mod_unixd.so
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<IfModule ssl_module>
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SSLRandomSeed startup builtin
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SSLRandomSeed connect builtin
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</IfModule>
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<IfModule unixd_module>
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User daemon
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Group daemon
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</IfModule>
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ServerAdmin you@example.com
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ErrorLog /proc/self/fd/2
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LogLevel warn
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<IfModule log_config_module>
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LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
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LogFormat "%h %l %u %t \"%r\" %>s %b" common
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<IfModule logio_module>
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LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O" combinedio
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</IfModule>
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CustomLog /proc/self/fd/1 common
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</IfModule>
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ServerRoot "/usr/local/apache2"
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Listen 5043
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<Directory />
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AllowOverride none
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Require all denied
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</Directory>
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<VirtualHost *:5043>
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ServerName myregistrydomain.com
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SSLEngine on
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SSLCertificateFile /usr/local/apache2/conf/domain.crt
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SSLCertificateKeyFile /usr/local/apache2/conf/domain.key
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## SSL settings recommendation from: https://raymii.org/s/tutorials/Strong_SSL_Security_On_Apache2.html
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# Anti CRIME
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SSLCompression off
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# POODLE and other stuff
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SSLProtocol all -SSLv2 -SSLv3 -TLSv1
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# Secure cypher suites
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SSLCipherSuite EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH
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SSLHonorCipherOrder on
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Header always set "Docker-Distribution-Api-Version" "registry/2.0"
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Header onsuccess set "Docker-Distribution-Api-Version" "registry/2.0"
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RequestHeader set X-Forwarded-Proto "https"
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ProxyRequests off
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ProxyPreserveHost on
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# no proxy for /error/ (Apache HTTPd errors messages)
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ProxyPass /error/ !
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ProxyPass /v2 http://registry:5000/v2
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ProxyPassReverse /v2 http://registry:5000/v2
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<Location /v2>
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Order deny,allow
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Allow from all
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AuthName "Registry Authentication"
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AuthType basic
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AuthUserFile "/usr/local/apache2/conf/httpd.htpasswd"
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AuthGroupFile "/usr/local/apache2/conf/httpd.groups"
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# Read access to authentified users
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<Limit GET HEAD>
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Require valid-user
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</Limit>
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# Write access to docker-deployer only
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<Limit POST PUT DELETE PATCH>
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Require group pusher
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</Limit>
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</Location>
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</VirtualHost>
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EOF
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# Now, create a password file for "testuser" and "testpassword"
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docker run --entrypoint htpasswd httpd:2.4 -Bbn testuser testpassword > auth/httpd.htpasswd
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# Create another one for "testuserpush" and "testpasswordpush"
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docker run --entrypoint htpasswd httpd:2.4 -Bbn testuserpush testpasswordpush >> auth/httpd.htpasswd
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# Create your group file
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echo "pusher: testuserpush" > auth/httpd.groups
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# Copy over your certificate files
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cp domain.crt auth
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cp domain.key auth
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# Now create your compose file
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cat <<EOF > docker-compose.yml
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apache:
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image: "httpd:2.4"
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hostname: myregistrydomain.com
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ports:
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- 5043:5043
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links:
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- registry:registry
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volumes:
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- `pwd`/auth:/usr/local/apache2/conf
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registry:
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image: registry:2
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ports:
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- 127.0.0.1:5000:5000
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volumes:
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- `pwd`/data:/var/lib/registry
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EOF
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```
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## Starting and stopping
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Now, start your stack:
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docker-compose up -d
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Log in with a "push" authorized user (using `testuserpush` and `testpasswordpush`), then tag and push your first image:
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docker login myregistrydomain.com:5043
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docker tag ubuntu myregistrydomain.com:5043/test
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docker push myregistrydomain.com:5043/test
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Now, log in with a "pull-only" user (using `testuser` and `testpassword`), then pull back the image:
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docker login myregistrydomain.com:5043
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docker pull myregistrydomain.com:5043/test
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Verify that the "pull-only" can NOT push:
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docker push myregistrydomain.com:5043/test
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