SSO In Apache HTTPD — ADFS

Active Directory Federated Services (ADFS) can be used by servers inside or outside of the company network. This makes it an especially attractive authentication option for third party companies as no B2B connectivity is required to just authenticate the user base. Many third-party vendors are starting to support ADFS authentication in their out-of-the-box solution (in which case they should be able to provide config documentation), but anything hosted on Apache HTTPD can be configured using these directions:

This configuration uses the https://github.com/UNINETT/mod_auth_mellon module — I’ve built this from the repo. Once mod_auth_mellon is installed, create a directory for the configuration

mkdir /etc/httpd/mellon

Then cd into the directory and run the config script:

/usr/libexec/mod_auth_mellon/mellon_create_metadata.sh urn:samplesite:site.example.com "https://site.example.com/auth/endpoint/"

 

You will now have three files in the config directory – an XML file along with a cert/key pair. You’ll also need the FederationMetadata.xml from the IT group – it should be

Now configure the module – e.g. a file /etc/httpd/conf.d/20-mellon.conf – with the following:

MellonCacheSize 100
MellonLockFile /var/run/mod_auth_mellon.lock
MellonPostTTL 900
MellonPostSize 1073741824
MellonPostCount 100
MellonPostDirectory "/var/cache/mod_auth_mellon_postdata"

To authenticate users through the ADFS directory, add the following to your site config

MellonEnable "auth"
Require valid-user
AuthType "Mellon"
MellonVariable "cookie" 
MellonSPPrivateKeyFile /etc/httpd/mellon/urn_samplesite_site.example.com.key
MellonSPCertFile /etc/httpd/mellon/urn_samplesite_site.example.com.cert
MellonSPMetadataFile /etc/httpd/mellon/urn_samplesite_site.example.com.xml
MellonIdPMetadataFile /etc/httpd/mellon/FederationMetadata.xml
MellonMergeEnvVars On ":"
MellonEndpointPath /auth/endpoint

 

Provide the XML file and certificate to the IT team that manages ADFS to configure the relying party trust.

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