KNIME Server Enterprise Setup Guide


Introduction

This guide covers advanced topics of a KNIME server deployment, setup and configuration in an enterprise environment.

If you are looking to install KNIME Server, you should first consult the KNIME Server Installation Guide.

For guides on connecting to KNIME Server from KNIME Analytics Platform, or using KNIME WebPortal please refer to the following guides:

For all regular administration configuration options and a basic understanding of KNIME server please consult the KNIME Server Administration Guide.

In the following it is assumed that you have a knowledge of all things covered in the previously mentioned guides.

Enterprise User Authentication

User authentication in an enterprise environment is usually done through some centralized service. The most used service is LDAP. LDAP authentication is the recommended authentication in any case where an LDAP server is available. If you are familiar with your LDAP configuration you can add the details during installation time, or edit the server.xml file post installation. If you are unfamiliar with your LDAP settings, you may need to contact your LDAP administrator, or use the configuration details for any other Tomcat based system in your organization. This section describes how to set up KNIME Server for LDAP authentication.

Another possibility of user authentication is single-sign-on. KNIME Server can be configured to support Kerberos authentication in combination with LDAP. This section also contains steps for a simple Kerberos setup.

Configuring an LDAP connection for KNIME Server

KNIME Server manages all user authentication by the built-in mechanisms of Apache Tomcat. Therefore the most comprehensive documentation for configuring authentication is the Apache Tomcat Realm Configuration HOW-TO. Specifically for information about LDAP (also Active Directory) configuration, see section JNDIRealm.

Terminology. Throughout this document we refer to establishing an LDAP connection, LDAP account etc. Since one of the popular ways to manage user authentication is Microsoft Active Directory, and this supports LDAP, you may want to substitute LDAP account for Active Directory account.

Quickstart

In most cases it should be possible to contact your local LDAP/Active Directory administrator they should be able to provide the necessary information.

You can ask for the following:

  1. Do they already have configuration details for a Tomcat server? If so, this connection information can be reused.

  2. LDAP Connection information (Hostname, Port, is TLS/SSL used?).

  3. Whether they are using bind mode, or comparison mode.

  4. How the group information is stored.

They will need to provide configuration that can fit into a template like this:

<Realm   className="org.apache.catalina.realm.JNDIRealm"
     connectionURL="ldap://localhost:389"
       userPattern="uid={0},ou=people,dc=mycompany,dc=com"
          roleBase="ou=groups,dc=mycompany,dc=com"
          roleName="cn"
        roleSearch="(uniqueMember={0})"
/>

This information is added to the server.xml file which is found in <apache-tomee>/conf/server.xml.

A restart of the Apache TomEE process and KNIME Server is required for the changes to the configuration file to take effect.

Advanced Troubleshooting

The remaining sections of this documentation describe how to setup an LDAP connection for KNIME Server. This is only intended as a way to gather related information into one place, not as comprehensive documentation for either LDAP or Tomcat.

The first prerequisite is Apache Directory Studio, or some other LDAP configuration tool. We use Apache Directory Studio to do the testing. The benefit of using this tool is that it is open source, free to download, works on Windows/Linux/Mac, so a customer can download the software and do queries to get started.

We will follow three basic steps:

  1. LDAP Connection information (Hostname, Port, SSL?).

  2. Whether they are using bind mode, or comparison mode.

  3. How the group information is stored.

LDAP Connection information (Hostname, Port, SSL)

To establish a connection to an LDAP server you’ll need to know:

  • The LDAP server hostname (or IP)

  • Whether the server uses SSL secured connections or not

  • Which port is being used — default ports are 389 for LDAP (unencrypted, or encrypted by TLS) and 636 for LDAPS (SSL secured)

Setup Apache Directory Studio to browse your LDAP directory

Setup connection to server
02 apache active directory
Add in the connection details of your LDAP server
02 new ldap connection
Setup connection to LDAP server

Note that we don’t use authentication here. Typically, you will need to authenticate, and in most cases this can be your LDAP username and password.

02 new ldap connection auth
Setup connection

You can click 'Fetch Base DNs' to autopopulate the answers. In our example the Base DN is dc=example,dc=com. This will vary, for example knime.com might use the Base DN dc=knime,dc=com.

02 new ldap connection browser
Finalize connection

You can leave the the next page as is, and click Finish.

02 new ldap connection edit

Browse LDAP Tree

The LDAP Browser is now populated, and you can begin browsing the LDAP directory.

02 new ldap connection edit
Determine information required for KNIME/Tomcat LDAP configuration

First refer to the tomcat documentation on LDAP. The documentation is very comprehensive, we distilled some of the key points below. For full details refer to the tomcat documentation.

Basically we need to construct something that looks like:

<Realm   className="org.apache.catalina.realm.JNDIRealm"
     connectionURL="ldap://52.50.222.127:389"
       userPattern= TOBEDETERMINED
          roleBase= TOBEDETERMINED
          roleName= TOBEDETERMINED
        roleSearch= TOBEDETERMINED
/>

We already know the connectionURL, since this was required to setup Apache Directory Studio.

Next we need to determine the userBase property. The first item in the tree is usually the Base DN, which will define the userBase property.

02 LDAP Browser BaseDN

You can browse the tree to find the users. In our case ou=People. Expanding the subtree shows the list of users. In our case there are four users (ec2-user, ldapuser1, ldapuser2, ldapuser3).

Determine whether users are checked by bind mode, or comparison mode

Bind Mode

In our case, if users log in as e.g. ldapuser1 (the username is the same as the key).

We already know the Base DN, and looking at the user information we see that the uid is the username that we want to use to authenticate. So we can construct the userPattern.

02 LDAP settings

Use the userPattern: uid={0},ou=people,dc=example,dc=com

So the example would look like:

<Realm   className="org.apache.catalina.realm.JNDIRealm"
     connectionURL="ldap://52.50.222.127:389"
       userPattern="uid={0},ou=people,dc=example,dc=com"
          roleBase=TOBEDETERMINED
          roleName=TOBEDETERMINED
        roleSearch=TOBEDETERMINED
/>

Note that we still don’t know how to specify roleBase, roleName, roleSearch. We’ll come back to that later.

Comparison Mode

In this case there is no one-to-one mapping between the login name and the username, we want to use e.g. the email address category. In this example that is ldapuser1@example.com.

02 LDAP settings

To perform this kind of login, we need comparison mode:

Here the Base DN is needed for userBase, and we also need to define userSearch. Here we are searching for mail.

<Realm   className="org.apache.catalina.realm.JNDIRealm"
    connectionName="cn=Manager,dc=example,dc=com"
connectionPassword="secret"
     connectionURL="ldap://52.50.222.127:389"
          userBase="ou=people,dc=example,dc=com"
        userSearch="(mail={0})"
      userRoleName="memberOf"
          roleBase= TOBEDETERMINED
          roleName= TOBEDETERMINED
        roleSearch= TOBEDETERMINED
/>

Group access

Now that users are authenticated, we need to configure the groups that have access:

For that we will need the roleBase and the roleName parameters. You can browse the ou=Group tree for more information. Here let’s take the example that the hrpeople group should be able to access KNIME Server.

02 LDAP Browser ouGroup
02 LDAP settings groupAuth

In the example, value is member that we want to search for is 'member'.

Which leads to the configuration:

<Realm   className="org.apache.catalina.realm.JNDIRealm"
     connectionURL="ldap://52.50.222.127:389"
          userBase="ou=people,dc=example,dc=com"
        userSearch="(mail={0})"
      userRoleName="memberOf"
          roleBase="ou=Group,dc=example,dc=com"
          roleName="cn"
        roleSearch="(member={0})"
/>

There is a second possibility where group membership is stored in the user data (this is uncommon, and not covered in this guide. See the full Tomcat documentation).

Nested roles (where a role/group can contain other roles/groups) are also possible, in which case add the roleNested parameter. E.g. Group 'IT', contains some usernames, plus 'Windows', 'UNIX', 'Mac' groups. Those groups may also contain sub-groups.

Hopefully you now have the details that you need to connect KNIME Server to LDAP.

Active Directory Example

If you are using Active Directory as your user database and sticked to the default structure, the following configuration serves as a good starting point:

<Realm className="org.apache.catalina.realm.JNDIRealm"
   connectionName="cn=Manager,dc=example,dc=com"
   connectionPassword="secret"
   connectionURL="ldap://52.50.222.127:389"
   userSubtree="true"
   userBase="cn=Users,dc=domain,dc=com"
   userSearch="(sAMAccountName={0})"
   userRoleName="memberOf"
   roleBase="cn=Users,dc=domain,dc=com"
   roleName="cn"
   roleSearch="(member={0})"
   roleSubtree="true"
   roleNested="true"/>

You have to adjust the three highlighted connection parameters, as well as the two dc values in the userBase and roleBase. The other parameters can usually be used as they are.

Combined Realm

It is possible to setup a combined realm where both the user database and LDAP authentication are used in parallel. Generally this is not recommended, but can be useful for debugging and initial setup/testing. The example below shows how this might work.

<Realm className="org.apache.catalina.realm.LockOutRealm">
    <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
           resourceName="UserDatabase"/>
    <Realm   className="org.apache.catalina.realm.JNDIRealm"
         connectionURL="ldap://52.50.222.127:389"
              userBase="ou=people,dc=example,dc=com"
            userSearch="(mail={0})"
          userRoleName="memberOf"
              roleBase="ou=Group,dc=example,dc=com"
              roleName="cn"
            roleSearch="(member={0})"/>
</Realm>

Encrypted LDAP

In case you are using encrypted LDAP authentication and your LDAP server is using a self-signed certificate, Tomcat will refuse it. In this case you need to add the LDAP server’s certificate to the global Java keystore, which is located in <jre-directory>/lib/security/cacerts:

keytool -import -v -noprompt -trustcacerts -file
<server certificate> -keystore <jre>/lib/security/cacerts -storepass changeit

Alternatively, you can copy the cacerts file, add your server certificate, and add the following two system properties to <tomee-directory>/conf/catalina.properties:

javax.net.ssl.trustStrore=<copied keystore>
javax.net.ssl.keyStorePassword=changeit

Troubleshooting

In some cases you will want to extract additional log file information about the LDAP authentication process. In this case you can edit apache-tomee*/conf/logging.properties to add:

org.apache.catalina.realm.level = ALL
org.apache.catalina.realm.useParentHandlers = true
org.apache.catalina.authenticator.level = ALL
org.apache.catalina.authenticator.useParentHandlers = true

Once you have made the changes you will need to restart the apache-tomee process/service. When you have successfully debugged your problem, don’t forget to comment out or remove these lines from the logging.properties file, as it will create unnecessarily large log files.

Configuring Single-Sign-On with Kerberos and LDAP

Single-Sign-On can be configured for KNIME Server. This includes the WebPortal, but also all other services (REST, SOAP, etc.) KNIME Server provides.

The technology used to achieve this is Kerberos, which is a network protocol used for authentication by the means of tickets and strong encryption. In the following it is assumed that you are familiar with the basic concepts of Kerberos and LDAP, as explained in the section before. You can find comprehensive documentation for the latest version of Kerberos here.

This section describes step-by-step how to set up Kerberos authentication by the means of an Active Directory service and Windows clients. Other setups are possible and may require different procedures to be functional.

Most setups will deviate in certain aspects from this guide, so make adjustments where necessary.

Kerberos requires setup for all three parties involved: the Kerberos and LDAP service (Active Directory), the TomEE server running KNIME Server, and the clients.

Active Directory Configuration

The first step is to set up the Active Directory correctly. It is assumed that you already have an Active Directory domain with users and correct groups for KNIME Server usage set up. Additional steps specific to Kerberos are:

  1. Create a technical user for the TomEE server in LDAP.

  2. Associate a Service Principal Name (SPN) on with the newly created user for the TomEE server. To do so, open a Windows PowerShell and enter:

    setspn -s HTTP/TOMEE_FQDN@REALM TECHNICAL_USER

    In the above command, replace

    • TOMEE_FQDN with the fully qualified domain name (FQDN) of the machine that runs KNIME Server (and thus the TomEE server),

    • REALM with the Kerberos realm of your Active Directory installation,

    • and TECHNICAL_USER with the name of the technical user you have created in the previous step.

      It is important that for the TOMEE_FQDN the DNS entries (FQDN to IP) as well as reverse DNS entries (IP to FQDN) entries can resolved by the domain controller and all clients.

  3. Make sure that the right encryption methods are active on the domain controller:

    02 security options
    1. Go to Administrative Tools → Local Security Policy

    2. Browse to Security Settings/Local Policies/Security Options

    3. Find the entry Network security: Configure encryption types allowed for Kerberos. If the value is not defined, then all encryption types are allowed. If it is defined, make sure it contains at least the methods: RC4_HMAC, AES128, AES256 and Future Encryption Types.

  4. Open a Windows PowerShell and create a keytab file using the following command. Adjust the values according to your settings:

    ktpass /out PATH/tomcat.keytab
      /mapuser TECHNICAL_USER@REALM
      /princ HTTP/TOMEE_FQDN@REALM
      /Pass +rndPass
      /crypto AES256-SHA1 ptype KRB5_NT_PRINCIPAL

    The created keytab file needs to be copied to the TomEE server later.

  5. Open the "User Properties" in Active Directory for the technical TomEE user you have created. Then go to the "Account" tab and make sure the following settings are set:

    02 TomEE user properties account
    1. User logon name is correctly set

    2. Password never expires = true

    3. User cannot change password = true

    4. This account supports Kerberos AES 128 bit encryption = true

    5. This account supports Kerberos AES 256 bit encryption = true

    6. Use Kerberos DES encryption for this account = false (recommended)

  6. Then go to the "Delegation" tab and set the radio button to Trust this user for delegation to any service (Kerberos only)

TomEE Server Configuration

  1. Install KNIME Server as outlined in the KNIME Server Installation Guide.

  2. Make appropriate configuration adjustments as explained in the KNIME Server Administration Guide.

  3. Setup LDAP authentication in the server.xml to connect to your Active Directory, as described in Configuring an LDAP connection for KNIME Server . Note that it might be necessary to create a temporary listing user to perform the LDAP lookups. This step is optional, but recommended to test that basic LDAP authentication is functional.

  4. Verify that the environment variables JAVA_HOME and CATALINA_HOME are properly defined:

    • JAVA_HOME should point to the JDK8 home directory (containing a bin folder)

    • CATALINA_HOME should point to the TomEE directory (containing a bin folder).

    On Windows this can be done in Control Panel → System → Advanced system settings

    02 Advanced system settings
    1. Click on Environment Variables

    2. In the System Variables group check for the existence of JAVA_HOME and CATALINA_HOME. Create or adjust the values accordingly.

    On Linux create or change the values in /etc/default/apache-tomee

  5. Once a working standard LDAP setup has been verified, make a backup of the contents of CATALINA_HOME/conf by copying it to CATALINA_HOME/conf_ldap.

  6. On Windows, open regedit and do the following:

    1. Navigate to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Lsa\Kerberos\Parameters.

    2. Add the key allowtgtsessionkey (REG_DWORD) and set the value to 1.

      02 registry key
      02 registry edit DWORD
  7. On Windows, make sure that the right encryption methods for Kerberos are active:

    1. Go to Administrative Tools → Local Security Policy

    2. Browse to Security Settings/Local Policies/Security Options

    3. Find the entry Network security: Configure encryption types allowed for Kerberos

      02 security options
    4. If the value is not defined all encryption types are allowed. If it is defined, make sure it contains at least the methods: RC4_HMAC, AES128, AES256 and Future Encryption Types.

  8. Install the Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy files for JDK8:

    1. Download the archive from the Oracle Website

    2. Create a backup of the security policy files in the Java 8 JRE locations (jre/lib/security, and jdk/jre/lib/security)

    3. Extract the archive into your Java 8 JRE locations (jre/lib/security, and jdk/jre/lib/security) replacing the files in those directories.

  9. Copy the previously created keytab file for the SPN to a location of your choosing. Recommended would be <CATALINA_HOME>/conf/

  10. Create a krb5.inf or krb5.conf file in <CATALINA_HOME/conf/. The contents of the file should look like:

    [libdefaults]
    default_realm=REALM
    default_keytab_name="CATALINA_BASE/conf/tomcat.keytab"
    default_txt_enctypes=aes256-cts-hmac-sha1-96,aes128-cts-hmac-sha1-96
    default_tgs_enctypes=aes256-cts-hmac-sha1-96,aes128-cts-hmac-sha1-96
    forwardable=true
    
    [realms]
    REALM={
     kdc=DOMAIN_CONTROLLER_FQDN:88
    }
    
    [domain_realm]
    yourdomain.com=REALM
    *.yourdomain.com=REALM

    Adjust the values according to your configuration. If you want to use a different location or file name for this file you can do so by defining the following Java system property: in CATALINA_HOME/conf/system.properties:

    -Djava.security.krb5.conf=PATH_TO_KRB5_CONF
  11. Create or edit the file <CATALINA_HOME>/conf/jaas.conf. The contents of the file should look like:

    com.sun.security.jgss.krb5.accept {
      com.sun.security.auth.module.Krb5LoginModule
      required
      doNotPrompt=true
      principal="HTTP/TOMEE_FQDN@REALM"
      keyTab="CATALINA_HOME/conf/tomcat.keytab"
      storeKey=true
      useKeyTab=true
      useTicketCache=true
      isInitiator=true
      refreshKrb5Config=true
      moduleBanner=true
      storePass=true;
    };
    com.sun.security.jgss.krb5.initiate {
      com.sun.security.auth.module.Krb5LoginModule
      required
      doNotPrompt=true
      principal="HTTP/TOMEE_FQDN@REALM"
      keyTab="CATALINA_HOME/conf/tomcat.keytab"
      storeKey=true
      useKeyTab=true
      useTicketCache=true
      isInitiator=true
      refreshKrb5Config=true
      moduleBanner=true
      storePass=true;
    };

    Adjust the values according to your configuration. Note that the location to the keytab file might have to be given as an absolute path.
    If you want to use a different location or file name for the jaas.conf you can do so by defining the Java system property

    -Djava.security.auth.login.conf=PATH_TO_JAAS_CONF

    In Kerberos documentation this file is often referred to as the login.conf.

  12. Add the following property to the list of JVM system properties at startup. Usually they can be defined in <CATALINA_HOME>/conf/system.properties:

    -Djavax.security.auth.useSubjectCredsOnly=false
  13. Configure the KNIMEServerAuthenticator valve:

    1. Navigate to <CATALINA_HOME>/conf/Catalina/localhost/

    2. Edit the knime.xml file (the name of the file is equal to the context root that was set in the KNIME Server installer, the default is knime, if the knime.war file was renamed to renamed.war, the xml file will be called renamed.xml)

    3. Find the line

      <Valve className="com.knime.enterprise.tomcat.authenticator.KnimeServerAuthenticator" enableSpnego="false"
       basicAuthPaths="/rest,/webservices" formAuthPaths="/" />
    4. Change it to

      <Valve className="com.knime.enterprise.tomcat.authenticator.KnimeServerAuthenticator" enableSpnego="true"
      basicAuthPaths="/rest,/webservices" />
    5. By default, the REST and SOAP webservices are set up to use basic HTTP authentication. If you want to use Single-Sign-On also for the REST and/or SOAP webservices, e.g. if you are using a REST client that supports Kerberos, adjust the basicAuthPaths attribute accordingly. It is a comma separated list of paths overwriting the default authentication method. Deleting the attribute enables Kerberos for all services.

      For example if REST is supposed to be used with Single-Sign-On the attribute would look like this: basicAuthPaths="/webservices"

  14. Modify the server.xml and adjust the JNDIRealm settings to connect to your LDAP. If you have successfully tested your setup in step 3, it is sufficient to remove the connectionName and connectionPassword attributes.

    Please note that with Kerberos the connectionName and connectionPassword attributes are ignored. Also the use of the userPattern is not supported by Tomcat when using Kerberos. Use userBase in combination with userSearch instead.

    The realm definition could look like this:

    <Realm className="org.apache.catalina.realm.JNDIRealm"
       connectionURL="ldap://dc.domain.com:3268"
       userSubtree="true"
       userBase="cn=Users,dc=domain,dc=com"
       userSearch="(sAMAccountName={0})"
       userRoleName="memberOf"
       roleBase="cn=Users,dc=domain,dc=com"
       roleName="cn"
       roleSearch="(member={0})"
       roleSubtree="true"
       roleNested="true"/>

    If you are using Kerberos in a combined realm, make sure the JNDIRealm connecting to your LDAP is first in the list of realms.

  15. Restart KNIME Server for the changes to take effect. Inspect the log files in CATALINA_HOME/logs to make sure that there are no error messages relating to your changes.

Client Configuration

Client configuration requires two steps:

  1. The client machine needs to be part of the domain, and the end user logged into that domain.

  2. All browsers used by the client need to have Kerberos authentication enabled. The following sections describe how to Internet Explorer and Firefox for Kerberos authentication.

Enabling Kerberos Authentication in Internet Explorer
  1. Open the "Internet Options" menu and browse to the "Advanced" tab.

    02 Internet Explorer Advanced Settings

    The setting "Enable Integrated Windows Authentication" needs to be checked.

  2. Browse to the "Security" tab, select "Local Intranet" and click on the "Sites" button.

    02 Internet Explorer Security Settings
  3. Click on "Advanced" and add the URL of KNIME Server to the list of websites in the zone.

  4. Click on "Custom Level" and check that in Local Intranet Security Level → User Authentication is set to "Automatic logon only in Intranet zone"

    02 Internet Explorer Security Advanced
  5. It might be necessary to also add KNIME Server to the list of trusted sites. To do so, go to "Trusted Sites" and click on the "Sites" button. Add the URL of KNIME Server to the list of websites in the zone.

  6. Check that the Trusted Sites Security Level → User Authentication is set to "Automatic log-on with current username and password".

    02 Internet Explorer Security Advanced userPW
Enable Kerberos Authentication in Firefox
  1. Start Firefox and type about:config in the address bar.

  2. Ignore the warning by clicking on the "I’ll be careful, I promise!" button.

    02 Firefox about config warning
  3. Find the appropriate settings by typing network.negotiate-auth in the search field.

    02 Firefox about config

    Change the network.negotiate-auth.delegation-uris and network.negotiate-auth.trusted-uris to contain the URL of KNIME Server. It might be enough to just enter your domain.

Troubleshooting

A Kerberos setup is usually very complex and needs precise configuration. Error messages are often times cryptic. To debug a Kerberos setup it is very helpful to enable additional logging for the authentication in the TomEE server. To do so you can configure a few things.

  1. To enable logging in the Krb5 modules, add or enable the following two lines in both section of the jaas.conf (or login.conf in <CATALINA_HOME>/conf):

    debug=true
    moduleBanner=true

    Note that the debug output is only printed to console.

  2. To increase the debug output of the Kerberos implementation in Java add the following system property on startup (can be done in system.properties file in <CATALINA_HOME>/conf):

    -Dsun.security.krb5.debug=true
  3. Add debugging for authentication and realm modules by adding to the logging.properties file in <CATALINA_HOME>/conf. For clarity all authentication output can be logged into a separate file.

    [...]
    
    4auth.org.apache.juli.FileHandler.level = FINE
    4auth.org.apache.juli.FileHandler.directory = ${catalina.base}/logs
    4auth.org.apache.juli.FileHandler.prefix = auth.
    
    [...]
    
    org.apache.catalina.realm.level = ALL
    org.apache.catalina.realm.handlers = 4auth.org.apache.juli.FileHandler
    
    org.apache.catalina.authenticator.level = ALL
    org.apache.catalina.authenticator.handlers = 4auth.org.apache.juli.FileHandler
    
    com.knime.enterprise.tomcat.handlers = 4auth.org.apache.juli.FileHandler
    com.knime.enterprise.tomcat.level = DEBUG
    
    org.apache.juli.logging.UserDataHelper.CONFIG = INFO_ALL
    
    org.apache.coyote.http11.level = DEBUG
    org.apache.coyote.http11.handlers = 4auth.org.apache.juli.FileHandler

Dynamic profiles for server-managed customizations

As mentioned in the KNIME Server Administration Guide it is possible to write a custom profile provider which selects the server and the list of profiles dynamically. This custom provider must be an implementation of the org.knime.product.profiles.IProfileProvider interface which is contained in the org.knime.product plug-in. The implementation of this interface must not make use of any classes that trigger reading preferences, otherwise the default preferences cannot be changed any more. This includes usage of commonly used KNIME classes such as KNIMEConstants or NodeLogger.

Therefore we suggest to create a new plug-in that only has a dependency to org.knime.product (for the IProfileProvider interface) and doesn’t use any other KNIME classes otherwise. An exception are classes from the org.knime.core.util plug-in because it doesn’t use any preferences (and never will be). Other than that, the implementation is straight-forward. The class org.knime.product.profiles.ExampleProfileProvider contains a minimal example of a custom profile provider that you can use as a starting point. Don’t forget to register your implementation at the extension point org.knime.product.profileProvider.

If you have any questions implementing a custom profile provider, don’t hesitate to contact us.