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WaTTS (the INDIGO Token Translation Service) is a plugin-based Token Translation Service. Enabled by plugins, several translation to various credentials (e.g. SSH keys, X.509, S3 access tokens, etc.) are supported.  WaTTS accepts many different implementations of OIDC providers (EGI-CheckIn, B2Access, Human Brain, Google and Indigo IAM).

In this pilot, we have implemented a plugin to demonstrate the integration with the RCauth.eu online CA. The WaTTS plugin implements a MasterPortal and VO-Portal for the RCauth CA. After authenticating in WaTTS  with any OIDC Provider, a certificate may be requested. For this, the user is redirected to the RCauth CA WAYF. There, she may choose which home-IdP to use for authenticating to RCauth. In this autentication step, the LoA must be high enough to fulfill policy requirements. To date B2Access, Checkin and a set of individual IdPs support these requirements.

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Upon successful authentication at RCauth.eu, the users browser is redirected back to WaTTS, where he is given a proxy of his certificate. The full certificate is stored inside a myProxy secure credential store. This store is not part of WaTTS, but a separate service (also shown in the picture below). Development to provide integration with VOMS, i.e. a VOMS proxy, is on-going.

Commandline / API Access:

One goal of this pilot is to show the command line (CLI) access. Once the user user has his OIDC-Access token on the command line, he can use the REST interface of WaTTS (we encourage the appropriate client wattson (https://github.com/indigo-dc/wattson) to retrieve his grid proxy.

Additional option is for the user to upload its SSH public key and then the key to obtain the proxy certificate via command line. For this, a separate plugin is provided.

Detailed description

Goal of the pilot is to demonstrate how WaTTS can be leveraged to deliver X.509 certificates of RCauth. In addition, support for usage from the commandline is demonstrated.

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User first needs to authenticate itself at WaTTS using one of the available OIDC providers. So far, EGI CheckIn service, EUDAT, Human Brain Project, INDIGO Access Management, and Google are supported. More OIDC providers can be provided in the future. After the successful login, user is displayed a number of available plugins is displayed to the user. For this demo, X509_RCauth_Pilot is the plugin used to provide the service, and user request a proxy certificate by clicking on the Request button. This plugin needs access to user's OIDC access token (this info is displayed to the user). As shown on the picture below, the RCauth plugin initially tries to get a proxy certificate from the credentials stored on the Credential Store (MyProxy server), where the user's credentials are stored under unique user's identifier. In case the credentials are not present in the Credential Store, the user is informed that it will be redirected to RCauth CA WAYF, where the user should use it's home IdP to authenticate itself. For the test CA used in this demo, IdPs with low LoA can be used. After the user is successfully authenticated at the second IdP, the plugin uses new user's information to retrieve the certificate from the RCauth CA, stores it in the Credential Store (PUT or STORE flow in the picture), and creates a proxy certificate which is then, subsequently, provided to the user (GET flow). Proxy certificate can be retrieved as long as the original certificate is valid (~ 11 days), and itself is valid for 12 hours. Long lived proxy certificate obtained from the RCauth CA, along with the user's private key, never leaves the Credential Store. Only Short Lived Proxy is provided to the user. Plugin also provides the possibility for the user to remove it's credentials from the Credential Store. To demonstrate CLI capability for the user to retrieve a short proxy certificate, small bash script is provided.

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  1. User accesses (or is redirected to) the WaTTS page, and selects its OIDC provider to log in. This may be EGI, EUDAT, Google, Human Brain Project or , INDIGO IAM or others.
  2. User is redirected to the desired OIDC provider at which it authenticates. NOTE, that the  the LoA is not relevant at this point (yet, since the demo uses the test CA).
  3. User is prompted to accept the release of information, and at the end, the information about the user is returned to WaTTS (i.e. LoA, issuer, name, mail, etc.)
  4. Back at WaTTS, user selects the X509_RCauth_Pilot
  5. If already authenticated with RCauth see point 7. Otherwise, user is notified that he will be redirected to authenticate at RCauth. NOTE, this authentication step is only required once every 11 days, since that is the lifetime of the End Entity certificate.
  6. User is redirected to RCauthWAYF and follows the respective "login-dance". NOTE: RCauth only offers accepts IdPs with an appropriate LoA.
  7. User is presented with a page that allows him to download its X.509 proxy-certificate.

For commandline access with wattson this flow is applied:

4. User is also presented with his OIDC Access Token.

5a. If already authenticated, user may use wattson (or the nice cli-get-proxy.sh) to follow the commandline flow. User's proxy will be placed to /tmp/x509up_uxxxx.

5b. If not authenticated, user is informed that it has to authenticate by pointing its browser to WaTTS.

NOTE:

In the future, for security reasons, users can retrieve their proxy certificates using SSH access, naturally after first obtaining End Entity Certificate. This feature is under development, and will be implemented soon (mid 2017). This wiki page will be updated to reflect future developments.

 

For obtaining a proxy via command line using SSH, the user needs to upload its SSH public key first. Afterwards, after first obtaining the proxy, the user can use its key to obtain a proxy. Separate plugin is provided for this access.

NOTE:

Names of the plugins may change.

WATTS source and info pages:

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Note that the WaTTS page might be moved in the future , probably to https://github.com/indigowatts-dckit/watts.

Also, plugins can also be found here https://github.com/watts-kit/watts.

 

Pilot resources

WATTS service (https://watts-dev.data.kit.edu)

Multiple OIDC providers (EGI CheckIn, EUDAT, Human Brain Project, IAM, Google)

 

myproxy server VM, running at KIT.

 

Demonstration workflow

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