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 Add SSL Support

Install mod_auth_mellon¶

Ensure Software Collections is enabled on the system

Install the mod_auth_mellon module:

yum install httpd24-mod_auth_mellon httpd24-mod_ssl

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

cd /etc/httpd/mellon/
wget https://adfs.organization.com/ADFS/metadata.xml -O idpmetadata.xml

Generate the mellon metadata

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
```
vi /etc/httpd/conf.d/00-mellon.conf
```

Add the following to the 00-mellon.conf file

<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

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:

# /etc/ood/config/ood_portal.yml
---
# ...
# Your other custom configuration options...
# ...

auth:
  - 'AuthType Mellon'
  - 'Require valid-user'

Restart the HTTPD
```
systemctl restart httpd
```