Tag: OAuth2

OAUTH Authentication in Apache Airflow (2.8.1)

There’s a rather innocuous sounding bug in Apache Airflow that should be corrected in 2.8.2 — https://github.com/apache/airflow/pull/36538 — that means you absolutely cannot set up SSO using OAUTH with FabAirflowSecurityManagerOverride. Using the deprecated AirflowSecurityManager would work, manually updating your Apache Airflow code with the fix will work. But there’s no point in trying to set up SSO with the FabAirflowSecurityManagerOverride as your custom security manager — whatever lovely code you write won’t be invoked, you’ll get an error saying the username or email address is not present even though you thoughtfully wrote out some custom code to map out those exact attributes, and it all looks like it should be working!

OpenID Authentication with OpenDistro

The following configuration changes needed to be made to enable federated authentication through OpenIDC using OpenDistro 1.8.0 withElasticSearch 7.7.0 — this presupposes that you have an application properly registered with an OIDC identity provider.


opendistro_security.auth.type: "openid"
opendistro_security.openid.connect_url: "https://login.example.com/.well-known/openid-configuration"
opendistro_security.openid.client_id: "REDACTED"
opendistro_security.openid.client_secret: "REDACTED"
opendistro_security.openid.scope: "openid"
opendistro_security.openid.header: "Authorization"
opendistro_security.openid.base_redirect_url: "https://opensearch.dev.example.com"

And then on the ElasticSearch node, update ./elasticsearch/config/elasticsearch.yml

opendistro_security.ssl.transport.truststore_filepath: cacerts

And ./elasticsearch/plugins/opendistro_security/securityconfig/config.yml

        description: "Authenticate via HTTP Basic against internal users database"
        http_enabled: true
        transport_enabled: true
        order: 4
          type: basic
          challenge: true
          type: intern
        http_enabled: true
        transport_enabled: true
        order: 1
          type: openid
          challenge: false
            enable_ssl: true
            verify_hostnames: false
            openid_connect_url: https://login.example.com/.well-known/openid-configuration
          type: noop

Use securityadmin.sh to update — it helps if you update ./elasticsearch/plugins/opendistro_security/securityconfig/roles_mapping.yml

  reserved: false
  - "admin"
  - "lisa"
  description: "Maps admin to all_access"

My experience is that the ElasticSearch API will allow authentication for local users. Kibana, however, does not — if you want to allow local users to log into Kibana, you’d either need a different Kibana instance (permanently allow local users to access Kibana) or update the kibana.yml to exclude the federated logon stuff & restart the service (temporary workaround when the identity provider has an issue).

The biggest challenge that I encountered is that there is, evidently, a bug in OpenDistro 1.13.1 that makes OIDC authentication non-functional. Downgrading to OpenDistro 1.13.0 worked, 1.8.0 (the version matched with our ElasticSearch 7.7.0 iteration) worked. And, reportedly, the newest 1.13.3 works as well.

SSO In Apache HTTPD – OAuth2

PingID is another external authentication source that looks to be replacing ADFS at work in the not-too-distant future. Unfortunately, I’ve not been able to get anyone to set up the “other side” of this authentication method … so the documentation is untested. There is an Apache Integration Kit available from PingID (https://www.pingidentity.com/en/resources/downloads/pingfederate.html). Documentation for setup is located at https://docs.pingidentity.com/bundle/pingfederate-apache-linux-ik/page/kxu1563994990311.html

Alternately, you can use OAuth2 through Apache HTTPD to authenticate users against PingID. To set up OAuth, you’ll need the mod_auth_openidc module (this is also available from the RedHat dnf repository). You’ll also need the client ID and secret that make up the OAuth2 client credentials. The full set of configuration parameters used in /etc/httpd/conf.d/auth_openidc.conf (or added to individual site-httpd.conf files) can be found at https://github.com/zmartzone/mod_auth_openidc/blob/master/auth_openidc.conf

As I am not able to register to use PingID, I am using an alternate OAUTH2 provider for authentication. The general idea should be the same for PingID – get the metadata URL, client ID, and secret added to the oidc configuration.

Setting up Google OAuth Client:

Register OAuth on Google Cloud Platform (https://console.cloud.google.com/) – Under “API & Services”, select “OAuth Consent Screen”. Build a testing app – you can use URLs that don’t go anywhere interesting, but if you want to publish the app for real usage, you’ll need real stuff.

Under “API & Services”, select “Credentials”. Select “Create Credentials” and select “OAuth Client ID”

Select the application type “Web application” and provide a name for the connection

You don’t need any authorized JS origins. Add the authorized redirect URI(s) appropriate for your host. In this case, the internal URI is my docker host, off port on 7443. The generally used URI is my reverse proxy server. I’ve had redirect URI mismatch errors when the authorized URIs don’t both include and exclude the trailing slash. Click “Create” to complete the operation.

You’ll see a client ID and secret – stash those as we’ll need to drop them into the openidc config file. Click “OK” and we’re ready to set up the web server.

Setting Up Apache HTTPD to use mod_auth_openidc

Clone the mod_auth_openidc repo (https://github.com/zmartzone/mod_auth_openidc.git) – I made one change to the Dockerfile. I’ve seen general guidance that using ENV to set DEBIAN_FRONTEND to noninteractive is not ideal, so I replaced that line with the transient form of the directive:

ARG DEBIAN_FRONTEND=noninteractive

I also changed the index.php file to

RUN echo "<html><head><title>Sample OAUTH Site</title><head><body><?php print $_SERVER['OIDC_CLAIM_email'] ; ?><pre><?php print_r(array_map(\"htmlentities\", apache_request_headers())); ?></pre><a href=\"/protected/?logout=https%3A%2F%2Fwww.rushworth.us%2Floggedout.html\">Logout</a></body></html>" > /var/www/html/protected/index.php

Build an image:

docker build -t openidc:latest .

Create an openidc.conf file on your file system. We’ll bind this file into the container so our config is in place instead of the default one. In my example, I have created “/opt/openidc.conf”. File content included below (although you’ll need to use your client ID and secret and your hostname). I’ve added a few claims so we have access to the name and email address (email address is the logon ID)

Then run a container using the image. My sandbox is fronted by a reverse proxy, so the port used doesn’t have to be well known.

docker run --name openidc -p 7443:443 -v /opt/openidc.conf:/etc/apache2/conf-available/openidc.conf -it openidc /bin/bash -c "source /etc/apache2/envvars && valgrind --leak-check=full /usr/sbin/apache2 -X"

* In my case, the docker host is not publicly available. I’ve also added the following lines to the reverse proxy at www.rushworth.us

ProxyPass /protected https://docker.rushworth.us:7443/protected
ProxyPassReverse /protected https://docker.rushworth.us:7443/protected

Access https://www.rushworth.us/protected/index.php (I haven’t published my app for Google’s review, so it’s locked down to use by registered accounts only … at this time, that’s only my ID. I can register others too.) You’ll be bounced over to Google to provide authentication, then handed back to my web server.

We can then use the OIDC_CLAIM_email — $_SERVER[‘OIDC_CLAIM_email’] – to continue in-application authorization steps (if needed).

openidc.conf content:

LogLevel auth_openidc:debug

LoadModule auth_openidc_module /usr/lib/apache2/modules/mod_auth_openidc.so

OIDCSSLValidateServer On

OIDCProviderMetadataURL https://accounts.google.com/.well-known/openid-configuration
OIDCClientID uuid-thing.apps.googleusercontent.com
OIDCClientSecret uuid-thingU4W

OIDCCryptoPassphrase S0m3S3cr3tPhrA53
OIDCRedirectURI https://www.rushworth.us/protected
OIDCAuthNHeader X-LJR-AuthedUser
OIDCScope "openid email profile"

<Location /protected>
     AuthType openid-connect
     Require valid-user

OIDCOAuthSSLValidateServer On
OIDCOAuthRemoteUserClaim Username