First, note that nuxeo-platform-login-portal-sso is a bit of a misnomer, what this module really does is establish a shared-secret method of authenticating between the Nuxeo server and a client.

Server

On the server side, you establish it using something like:

<extension
    target="org.nuxeo.ecm.platform.ui.web.auth.service.PluggableAuthenticationService"
    point="authenticators">
  <authenticationPlugin name="PORTAL_AUTH">
    <loginModulePlugin>Trusting_LM</loginModulePlugin>
    <parameters>
      <parameter name="secret">MySharedSecret</parameter>
      <parameter name="maxAge">60</parameter>
    </parameters>
  </authenticationPlugin>
</extension>

<!-- Include Portal Auth into authentication chain -->
<extension
    target="org.nuxeo.ecm.platform.ui.web.auth.service.PluggableAuthenticationService"
    point="chain">
  <authenticationChain>
    <plugins>
      <!--  Keep basic Auth at top of Auth chain to support RSS access via BasicAuth -->
      <plugin>BASIC_AUTH</plugin>
      <plugin>PORTAL_AUTH</plugin>
      <plugin>FORM_AUTH</plugin>
    </plugins>
  </authenticationChain>
</extension>

Here we've chosen to name this authentication method PORTAL_AUTH. Note that the secret parameter contains the shared secret that the client will have to know.

Client

On the client side, you could use one of the existing clients:

Using nuxeo-http-client

nuxeo-http-client is a sample Java client to do REST calls to Nuxeo. You can configure it connect to a server that uses nuxeo-platform-login-portal-sso by doing:

NuxeoServer nxServer = new NuxeoServer("http://127.0.0.1:8080/nuxeo");
nxServer.setAuthType(NuxeoServer.AUTH_TYPE_SECRET);
nxServer.setSharedSecretAuthentication("Administrator", "MySharedSecret");

See src/test/java/org/nuxeo/ecm/http/client/remote/tests/RemoteTests.java in nuxeo-http-client for more.

Using nuxeo-automation-client

nuxeo-automation-client is a more modern Nuxeo Java client using high-level Document abstractions. You can configure it to connect to a server that uses platform-login-portal-sso by doing:

HttpAutomationClient client = new HttpAutomationClient("http://localhost:8080/nuxeo/site/automation");
client.setRequestInterceptor(new PortalSSOAuthInterceptor("MySharedSecret", "Administrator"));
Session session = client.getSession();

See src/test/java/org/nuxeo/ecm/automation/client/jaxrs/test/SampleSSOPortal.java in nuxeo-automation-client for more.

Manual HTTP calls

If you want to do all the calls to Nuxeo yourself, you'll have to decide which HTTP requests to make, and in addition you'll have to send some specific headers to authenticate. The HTTP headers are:

• NX_TS: the timestamp, in milliseconds since epoch, when you're generating the request.
• NX_RD: a few some random characters.
• NX_USER: the user as whom you want to authenticate.
• NX_TOKEN: a token proving authentication generated using the algorithm BASE64_MD5(timestamp + ":" + random + ":" + secret + ":" + user)

The token contains the secret but in a hashed form which cannot be reversed by an eavesdropper to generate new requests. The timestamp is used to avoid replay attacks (the delta with the real time on the server cannot be more than the maxAge specified on the server). The random characters are used to avoid pre-computed dictionary attacks.

The following Java code can be used:

import java.security.MessageDigest;
import javax.xml.bind.DatatypeConverter;

public String makeToken(String timestamp, String random, String secret,
        String user) throws Exception {
    String clearToken = timestamp + ":" + random + ":" + secret + ":"
            + user;
    byte[] md5 = MessageDigest.getInstance("MD5").digest(
            clearToken.getBytes());
    return DatatypeConverter.printBase64Binary(md5);
}

As a validation of your code, check that makeToken("1324572561000", "qwertyuiop", "secret", "bob") returns 8y4yXfms/iKge/OtG6d2zg==