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oscwiag committed Nov 19, 2024
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4 changes: 4 additions & 0 deletions dismissable-announcements/.buildinfo
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115 changes: 115 additions & 0 deletions dismissable-announcements/_sources/architecture.rst.txt
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.. _architecture:

Architecture
============

Below are some diagrams of OnDemand's architecture:

#. Overview is a high level visual generated from Powerpoint.
#. System context and Container context diagrams below follow the `C4 <https://c4model.com/>`_.
model for software diagrams, are more technically detailed and are built using draw.io
#. Request flow diagram is a sequence diagram built using plantuml.

Overview
--------


.. figure:: /architecture/ood_overview.png

#. Apache is the server front end, running as the Apache user, and accepting all requests from users and serves four primary functions:

#. Authenticates user.
#. Starts Per-User NGINX processes (PUNs).
#. Reverse proxies each user to her PUN via Unix domain sockets.
#. Reverse proxies to interactive apps running on compute nodes (RStudio, Jupyter, VNC desktop) via TCP sockets.

#. The Per-User NGINX serves web apps in Ruby and NodeJS and is how users submit jobs and start interactive apps.


System context
-----------------------

Users use OnDemand to interact with their HPC resources through a web browser.

.. figure:: /architecture/ood_system_view.png

All the gray components are specific to a given site and outside the OnDemand
system.

Container context
-----------------------

.. tip::

In the C4 nomenclature, 'containers' are one level below the system context. This is
not to be confused with Linux containers via cgroups and namespaces (i.e. Docker or
Singularity or `OCI containers <https://www.opencontainers.org/>`_).

The Front-end proxy is the only component that is shared with all clients.
The Front-end proxy will create Per User Nginx (PUN) processes (light blue boxes labeled "Per User Instance").

.. figure:: /architecture/ood_container_view.png

* Everything contained in the dotted line is a part of the OnDemand system (see blue box in System context diagram).
* Everything outside of it in gray is site specific components.
* The "Per User Instance" light blue boxes are replicated for every user accessing the system.

Request Flow
-------------

This is the request flow through the OnDemand system. A user initiates a
request through a browser and this illustrates how that request propagates
through the system to a particular application (including the dashboard).

.. uml:: architecture/request-flow.uml

Other Request Flow Diagrams
----------------------------

================
Dashboard Access
================

.. figure:: /app-flow-diagrams/flow_access_dashboard.png

=============
Passenger App
=============

.. figure:: /app-flow-diagrams/flow_access_passenger_app.png

================
User App Sharing
================

.. figure:: /app-flow-diagrams/flow_access_usr_app_via_app_sharing.png

==============
Authentication
==============

.. figure:: /app-flow-diagrams/flow_authentication.png

==================
Linux Host Adapter
==================

.. figure:: /app-flow-diagrams/flow_linux_host_adapter.png

===========
Rstudio Job
===========

.. figure:: /app-flow-diagrams/flow_rstudio_job.png

=============
Shell Session
=============

.. figure:: /app-flow-diagrams/flow_start_shell_session.png

===============
VNC Desktop Job
===============

.. figure:: /app-flow-diagrams/flow_vnc_desktop_job.png
44 changes: 44 additions & 0 deletions dismissable-announcements/_sources/authentication.rst.txt
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.. _authentication:

Authentication
==============

Open OnDemand supports most authentication modules that work with Apache HTTP
Server version 2.4. The following :ref:`authentication-overview` section
provides an introduction to setting up these generic authentication modules
with an Open OnDemand installation. Tutorials will also be provided with the
focus on setting up some of the more common authentication modules (e.g.,
OpenID Connect with KeyCloak).

After installing Open OnDemand you **must** add authentication of some kind
to generate the correct Apache configuration. When no authentication is
supplied Apache will only serve a static page that directs you here.

No Open OnDemand functionality is available without authentication.

.. note::

If you managed to install an Apache authentication module at your center
that currently does not have a tutorial listed below we would greatly
appreciate it if you could take the time to contribute a detailed
walkthrough.


.. tip::

:ref:`Dex <authentication-dex>` is a very good starting option if you can connect
to LDAP or Active Directory and not an institutional Single Sign-On service.

.. toctree::
:maxdepth: 2

authentication/overview
authentication/oidc
authentication/dex
authentication/shibboleth
authentication/cas
authentication/tutorial-oidc-keycloak-rhel7
authentication/duo-2fa-with-keycloak
authentication/adfs-with-auth-mellon
authentication/nsf-access
authentication/insecure
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.. _authentication-adfs-with-auth-mellon:

SAML Authentication with Active Directory Federated Services (ADFS) and mod_auth_mellon
========================================================================================

The following details how to use ADFS infrastructure via SAML authentication to authenticate to an OpenOnDemand deployment.

Prepare the Host
--------------------------------------------------
Before beginning, retrieve the following information from the ADFS administrator:

#. The SAML 2.0 service URL (e.g., https://adfs.organization.com/ADFS/ls)
#. The IdP metadata URL (e.g., https://adfs.organization.com/ADFS/metadata.xml)
#. Ensure SSL is properly configured and any organizational certificate authorities are properly integrated into the host's trust store, see :ref:`add-ssl`

Install mod_auth_mellon
--------------------------------------------------

#. Ensure Software Collections is enabled on the system
#. Install the mod_auth_mellon module:

.. tabs::

.. tab:: EL7

.. code-block:: shell
yum install httpd24-mod_auth_mellon httpd24-mod_ssl
.. tab:: EL8+

.. code-block:: shell
yum install mod_auth_mellon mod_ssl
.. tab:: Ubuntu

.. code-block:: shell
apt install libapache2-mod-auth-mellon
Configure mod_auth_mellon
--------------------------------------------------

Note that this configuration assumes that SAML has been configured such that the returned NameID directly maps to a Unix user on the OOD host. For more information, see https://jdennis.fedorapeople.org/doc/mellon-user-guide/mellon_user_guide.html

#. Download the IDP metadata file

.. code-block:: shell
cd /etc/httpd/mellon/
wget https://adfs.organization.com/ADFS/metadata.xml -O idpmetadata.xml
#. Generate the mellon metadata

.. code-block:: shell
export mellon_endpoint="https://$(hostname)/mellon"
/usr/libexec/mod_auth_mellon/mellon_create_metadata.sh "${mellon_endpoint}/metadata" "${mellon_endpoint}"
mv *.cert ./mellon.cert
mv *.key ./mellon.key
mv *.xml ./mellon_metadata.xml
#. Create a mellon configuration file

.. code-block:: shell
vi /etc/httpd/conf.d/00-mellon.conf
#. Add the following to the ``00-mellon.conf`` file

.. code-block:: xml
<Location />
MellonSPPrivateKeyFile /etc/httpd/mellon/mellon.key
MellonSPCertFile /etc/httpd/mellon/mellon.cert
MellonSPMetadataFile /etc/httpd/mellon/mellon_metadata.xml
MellonIdPMetadataFile /etc/httpd/mellon/idpmetadata.xml
MellonEndpointPath /mellon
MellonEnable "auth"
</Location>
#. Convert the key and cert files into pfx format

.. code-block:: shell
openssl pkcs12 -export -inkey /etc/httpd/mellon/mellon.key -in /etc/httpd/mellon/mellon.cert -out /etc/httpd/mellon/mellon.pfx
#. Provide the ``mellon.pfx`` and ``mellon_metadata.xml`` files to your ADFS administrator. The files can then be imported into the ADFS system.

Configure OOD
--------------------------------------------------

#. Edit the ``ood_portal.yml`` file to include the following:

.. code-block:: yaml
# /etc/ood/config/ood_portal.yml
---
# ...
# Your other custom configuration options...
# ...
auth:
- 'AuthType Mellon'
- 'Require valid-user'
#. Restart the HTTPD

.. code-block:: shell
systemctl restart httpd
13 changes: 13 additions & 0 deletions dismissable-announcements/_sources/authentication/cas.rst.txt
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.. _authentication-cas:

CAS
---

Several HPC centers running OnDemand have successfully configured authentication using Central Authentication Service (CAS).

See `this Discourse <https://discourse.osc.edu/t/implementing-authentication-via-cas/34>`__ topic regarding several different examples configuring CAS authentication with OnDemand.

Related links:

- `mod_auth_cas <https://github.com/apereo/mod_auth_cas>`__
- `CAS project website <https://www.apereo.org/projects/cas>`__
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