Alfredo, Java HTTP SPNEGO 0.1.2 - Server Side Configuration

[ Go Back ]

Server Side Configuration Setup

The AuthenticationFilter filter is Alfredo's server side component.

This filter must be configured in front of all the web application resources that required authenticated requests. For example:

The Alfredo and dependent JAR files must be in the web application classpath (commonly the WEB-INF/lib directory).

Alfredo uses SLF4J-API for logging. Alfredo Maven POM dependencies define the SLF4J API dependency but it does not define the dependency on a concrete logging implementation, this must be addded explicitly to the web application. For example, if the web applicationan uses Log4j, the SLF4J-LOG4J12 and LOG4J jar files must be part part of the web application classpath as well as the Log4j configuration file.

Common Configuration parameters

  • config.prefix: If specified, all other configuration parameter names must start with the prefix. The default value is no prefix.
  • [PREFIX.]type: the authentication type keyword (simple>> or <<<kerberos) or a Authentication handler implementation.
  • [PREFIX.]signature.secret: The secret to SHA-sign the generated authentication tokens. If a secret is not provided a random secret is generated at start up time. If using multiple web application instances behind a load-balancer a secret must be set for the application to work properly.
  • [PREFIX.]token.validity: The validity -in seconds- of the generated authentication token. The default value is 3600 seconds.

Kerberos Configuration

IMPORTANT: A KDC must be configured and running.

To use Kerberos SPNEGO as the authentication mechanism, the authentication filter must be configured with the following init parameters:

  • [PREFIX.]type: the keyword kerberos.
  • [PREFIX.]kerberos.principal: The web-application Kerberos principal name. The Kerberos principal name must start with HTTP/.... For example: HTTP/localhost@LOCALHOST. There is no default value.
  • [PREFIX.]kerberos.keytab: The path to the keytab file containing the credentials for the kerberos principal. For example: /Users/tucu/alfredo.keytab. There is no default value.
  • Example:
    <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee">
    ...

    <filter>
        <filter-name>kerberosFilter</filter-name>
        <filter-class>com.cloudera.alfredo.server.AuthenticationFilter</filter-class>
        <init-param>
            <param-name>type</param-name>
            <param-value>kerberos</param-value>
        </init-param>
        <init-param>
            <param-name>kerberos.principal</param-name>
            <param-value>HTTP/localhost@LOCALHOST</param-value>
        </init-param>
        <init-param>
            <param-name>kerberos.keytab</param-name>
            <param-value>/tmp/alfredo.keytab</param-value>
        </init-param>
        <init-param>
            <param-name>token.validity</param-name>
            <param-value>30</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>kerberosFilter</filter-name>
        <url-pattern>/kerberos/*</url-pattern>
    </filter-mapping>

    ...
</web-app>

Pseudo/Simple Configuration

To use Pseudo/Simple as the authentication mechanism (trusting the value of the query string parameter 'user.name'), the authentication filter must be configured with the following init parameters:

  • [PREFIX.]type: the keyword simple.
  • [PREFIX.]simple.anonymous.allowed: is a boolean parameter that indicates if anonymous requests are allowed or not. The default value is false.
  • Example:
    <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee">
    ...

    <filter>
        <filter-name>simpleFilter</filter-name>
        <filter-class>com.cloudera.alfredo.server.AuthenticationFilter</filter-class>
        <init-param>
            <param-name>type</param-name>
            <param-value>simple</param-value>
        </init-param>
        <init-param>
            <param-name>simple.anonymous.allowed</param-name>
            <param-value>false</param-value>
        </init-param>
        <init-param>
            <param-name>token.validity</param-name>
            <param-value>30</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>simpleFilter</filter-name>
        <url-pattern>/simple/*</url-pattern>
    </filter-mapping>

    ...
</web-app>

    [ Go Back ]