Add support for certificates for repositories

docs/mkdocs.yml

@@ -83,6 +83,7 @@ pages:
 - ['articles/security.md', 'Articles', 'Security']
 - ['articles/https.md', 'Articles', 'Running Docker with HTTPS']
 - ['articles/host_integration.md', 'Articles', 'Automatically starting Containers']
+- ['articles/certificates.md', 'Articles', 'Using certificates for repository client verification']
 - ['articles/using_supervisord.md', 'Articles', 'Using Supervisor']
 - ['articles/cfengine_process_management.md', 'Articles', 'Process management with CFEngine']
 - ['articles/puppet.md', 'Articles', 'Using Puppet']

docs/sources/articles/certificates.md

@@ -0,0 +1,83 @@
+page_title: Using certificates for repository client verification
+page_description: How to set up per-repository client certificates
+page_keywords: Usage, repository, certificate, root, docker, documentation, examples
+
+# Using certificates for repository client verification
+
+This lets you specify custom client TLS certificates and CA root for a
+specific registry hostname. Docker will then verify the registry
+against the CA and present the client cert when talking to that
+registry. This allows the registry to verify that the client has a
+proper key, indicating that the client is allowed to access the
+images.
+
+A custom cert is configured by creating a directory in
+`/etc/docker/certs.d` with the same name as the registry hostname. Inside
+this directory all .crt files are added as CA Roots (if none exists,
+the system default is used) and pair of files `$filename.key` and
+`$filename.cert` indicate a custom certificate to present to the
+registry.
+
+If there are multiple certificates each one will be tried in
+alphabetical order, proceeding to the next if we get a 403 of 5xx
+response.
+
+So, an example setup would be::
+
+    /etc/docker/certs.d/
+    └── localhost
+       ├── client.cert
+       ├── client.key
+       └── localhost.crt
+
+A simple way to test this setup is to use an apache server to host a
+registry. Just copy a registry tree into the apache root,
+[here](http://people.gnome.org/~alexl/v1.tar.gz) is an example one
+containing the busybox image.
+
+Then add this conf file as `/etc/httpd/conf.d/registry.conf`:
+
+    # This must be in the root context, otherwise it causes a re-negotiation
+    # which is not supported by the tls implementation in go
+    SSLVerifyClient optional_no_ca
+
+    <Location /v1>
+    Action cert-protected /cgi-bin/cert.cgi
+    SetHandler cert-protected
+
+    Header set x-docker-registry-version "0.6.2"
+    SetEnvIf Host (.*) custom_host=$1
+    Header set X-Docker-Endpoints "%{custom_host}e"
+    </Location>
+
+And this as `/var/www/cgi-bin/cert.cgi`:
+
+    #!/bin/bash
+    if [ "$HTTPS" != "on" ]; then
+        echo "Status: 403 Not using SSL"
+        echo "x-docker-registry-version: 0.6.2"
+        echo
+        exit 0
+    fi
+    if [ "$SSL_CLIENT_VERIFY" == "NONE" ]; then
+        echo "Status: 403 Client certificate invalid"
+        echo "x-docker-registry-version: 0.6.2"
+        echo
+        exit 0
+    fi
+    echo "Content-length: $(stat --printf='%s' $PATH_TRANSLATED)"
+    echo "x-docker-registry-version: 0.6.2"
+    echo "X-Docker-Endpoints: $SERVER_NAME"
+    echo "X-Docker-Size: 0"
+    echo
+
+    cat $PATH_TRANSLATED
+
+This will return 403 for all accessed to `/v1` unless any client cert is
+presented. Obviously a real implementation would verify more details
+about the certificate.
+
+Example client certs can be generated with::
+
+    openssl genrsa -out client.key 1024
+    openssl req -new -x509 -text -key client.key -out client.cert

docs/sources/use.md

@@ -0,0 +1,14 @@
+# Use
+
+## Contents:
+
+ - [First steps with Docker](basics/)
+ - [Share Images via Repositories](workingwithrepository/)
+ - [Redirect Ports](port_redirection/)
+ - [Configure Networking](networking/)
+ - [Automatically Start Containers](host_integration/)
+ - [Share Directories via Volumes](working_with_volumes/)
+ - [Link Containers](working_with_links_names/)
+ - [Link via an Ambassador Container](ambassador_pattern_linking/)
+ - [Using Puppet](puppet/)
+ - [Using certificates for repository client verification](certificates/)