Bridge

We are planning to build a bridge from ownCloud 10 to ocis. The idea is to have a reverse proxy infront of ownCloud 10 that will forward requests to ownCloud 10 or ocis-reva, depending on the migration status of the logged in user.

This document is a work in progress of the current setup.

Current status

Using ocis and the ownCloud 10 openidconnect and graphapi plugins it is possible today to introduce openid connect based authentication to existing instances. That is a prerequisite for migrating to ocis.

How to do it

Install the owncloud 10 graphapi app

In an owncloud 10 apps folder

$ git clone git@github.com:owncloud/graphapi.git
$ cd graphapi
$ composer install

Enable the graphapi app

occ a:e graphapi

No configuration necessary. You can test with curl:

$ curl https://cloud.example.com/index.php/apps/graphapi/v1.0/users -u admin | jq
Enter host password for user 'admin':
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   694  100   694    0     0   4283      0 --:--:-- --:--:-- --:--:--  4283
{
  "value": [
    {
      "id": "admin",
      "displayName": "admin",
      "mail": null
    },
    {
      "id": "demo",
      "displayName": "Demo",
      "mail": null
    },
    ...

  ],
  "@odata.nextLink": "https://oc.butonic.de/apps/graphapi/v1.0/users?$top=10&$skip=10"
}

Note: The MS graph api actually asks for Bearer auth, but in order to check users passwords during an LDAP bind we are exploiting ownClouds authentication implementation that will grant access when Basic auth is used. An LDAP Bind you may ask? Read on!

Start ocis-glauth

We are going to use the above ownCloud 10 and graphapi app to turn it into the datastore for an LDAP proxy.

Grab it!

In an ocis folder

$ git clone git@github.com:owncloud/ocis-glauth.git
$ cd ocis-glauth
$ make

This should give you a bin/ocis-glauth binary. Try listing the help with bin/ocis-glauth --help.

Run it!

You need to point ocis-glauth to your owncloud domain:

$ bin/ocis-glauth --log-level debug server --backend-datastore owncloud --backend-server https://cloud.example.com --backend-basedn dc=example,dc=com

--log-level debug is only used to generate more verbose output --backend-datastore owncloud switches to tho owncloud datastore --backend-server https://cloud.example.com is the url to an ownCloud instance with an enabled graphapi app --backend-basedn dc=example,dc=com is used to construct the LDAP dn. The user admin will become cn=admin,dc=example,dc=com.

Check it is up and running

You should now be able to list accounts from your ownCloud 10 oc_accounts table using:

$ ldapsearch -x -H ldap://localhost:9125 -b dc=example,dc=com -D "cn=admin,dc=example,dc=com" -W '(objectclass=posixaccount)'

Groups should work as well:

$ ldapsearch -x -H ldap://localhost:9125 -b dc=example,dc=com -D "cn=admin,dc=example,dc=com" -W '(objectclass=posixgroup)'

Note: This is currently a readonly implementation and minimal to the usecase of authenticating users with idp.

Start ocis-web

Get it!

In an ocis folder

$ git clone git@github.com:owncloud/ocis.git
$ cd web
$ make

This should give you a bin/web binary. Try listing the help with bin/web --help.

Run it!

Point ocis-web to your owncloud domain and tell it where to find the openid connect issuing authority:

$ bin/web server --web-config-server https://cloud.example.com --oidc-authority https://192.168.1.100:9130 --oidc-metadata-url https://192.168.1.100:9130/.well-known/openid-configuration --oidc-client-id ocis

ocis-web needs to know

  • --web-config-server https://cloud.example.com is ownCloud url with webdav and ocs endpoints (oc10 or ocis)
  • --oidc-authority https://192.168.1.100:9130 the openid connect issuing authority, in our case oidc-idp, running on port 9130
  • --oidc-metadata-url https://192.168.1.100:9130/.well-known/openid-configuration the openid connect configuration endpoint, typically the issuer host with .well-known/openid-configuration, but there are cases when another endpoint is used, eg. ping identity provides multiple endpoints to separate domains
  • --oidc-client-id ocis the client id we will register later with ocis-idp in the identifier-registration.yaml

Start ocis-idp

Get it!

In an ocis folder

$ git clone git@github.com:owncloud/ocis-idp.git
$ cd ocis-idp
$ make

This should give you a bin/ocis-idp binary. Try listing the help with bin/ocis-idp --help.

Set environment variables

Konnectd needs environment variables to configure the LDAP server:

export LDAP_URI=ldap://192.168.1.100:9125
export LDAP_BINDDN="cn=admin,dc=example,dc=com"
export LDAP_BINDPW="its-a-secret"
export LDAP_BASEDN="dc=example,dc=com"
export LDAP_SCOPE=sub
export LDAP_LOGIN_ATTRIBUTE=uid
export LDAP_EMAIL_ATTRIBUTE=mail
export LDAP_NAME_ATTRIBUTE=givenName
export LDAP_UUID_ATTRIBUTE=uid
export LDAP_UUID_ATTRIBUTE_TYPE=text
export LDAP_FILTER="(objectClass=posixaccount)"

Don’t forget to use an existing user and the correct password.

Configure clients

Now we need to configure a client we can later use to configure the ownCloud 10 openidconnect app. In the assets/identifier-registration.yaml have:

---

# OpenID Connect client registry.
clients:
  - id: ocis
    name: ownCloud Infinite Scale
    insecure: yes
    application_type: web
    redirect_uris:
      - https://cloud.example.com/apps/openidconnect/redirect
      - http://localhost:9100/oidc-callback.html
      - http://localhost:9100
      - http://localhost:9100/

You will need the insecure: yes if you are using self signed certificates.

Replace cloud.example.com in the redirect URI with your ownCloud 10 host and port. Replace localhost:9100 in the redirect URIs with your ocis-web host and port.

Run it!

You can now bring up ocis-idp with:

$ bin/ocis-idp server --iss https://192.168.1.100:9130 --identifier-registration-conf assets/identifier-registration.yaml --signing-kid gen1-2020-02-27

ocis-idp needs to know

  • --iss https://192.168.1.100:9130 the issuer, which must be a reachable https endpoint. For testing an ip works. HTTPS is NOT optional. This url is exposed in the https://192.168.1.100:9130/.well-known/openid-configuration endpoint and clients need to be able to connect to it
  • --identifier-registration-conf assets/identifier-registration.yaml the identifier-registration.yaml you created
  • --signing-kid gen1-2020-02-27 a signature key id, otherwise the jwks key has no name, which might cause problems with clients. a random key is ok, but it should change when the actual signing key changes.

Check it is up and running

  1. Try getting the configuration:
$ curl https://192.168.1.100:9130/.well-known/openid-configuration
  1. Check if the login works at https://192.168.1.100:9130/signin/v1/identifier

Note: If you later get a Unable to find a key for (algorithm, kid):PS256, ) Error make sure you did set a --signing-kid when starting ocis-idp by checking it is present in https://192.168.1.100:9130/konnect/v1/jwks.json

Patch owncloud

While the UserSession in ownCloud 10 is currently used to test all available IAuthModule implementations, it immediately logs out the user when an exception occurs. However, existing owncloud 10 instances use the oauth2 app to create Bearer tokens for mobile and desktop clients.

To give the openidconnect app a chance to verify the tokens we need to change the code a bit. See https://github.com/owncloud/core/pull/37043 for a possible solution.

Note: The PR is hot … as in younger than this list of steps. And it messes with authentication. Use with caution.

Install the owncloud 10 openidconnect app

In an owncloud 10 apps folder

$ git clone git@github.com:owncloud/openidconnect.git
$ cd openidconnect
$ composer install

After enabling the app configure it in config/oidc.config.php

$CONFIG = [
  'openid-connect' => [
    'provider-url' => 'https://192.168.1.100:9130',
    'client-id' => 'ocis',
    'loginButtonName' => 'OpenId Connect @ Konnectd',
  ],
  'debug' => true, // if using self signed certificates
  // allow the different domains access to the ocs and webdav endpoints:
  'cors.allowed-domains' => [
    'https://cloud.example.com',
    'http://localhost:9100',
  ],
];

In the above configuration replace

  • provider-url with the URL to your ocis-idp issuer
  • https://cloud.example.com with the URL to your ownCloud 10 instance
  • http://localhost:9100 with the URL to your ownCloud Web instance

Note: By default the openidconnect app will use the email of the user to match the user from the oidc userinfo endpoint with the ownCloud account. So make sure your users have a unique primary email.

Next steps

Aside from the above todos these are the next steps

  • tie it all together behind ocis-proxy
  • create an ocis bridge command that runs all the ocis services in one step with a properly preconfigured ocis-idp identifier-registration.yaml file for ownCloud Web and the owncloud 10 openidconnect app, as well as a randomized --signing-kid.