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package edu.kit.scc.dei.ecplean;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathException;
import org.apache.http.HttpResponse;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.xml.sax.SAXException;
public class ECPAuthenticator extends ECPAuthenticatorBase {
public ECPAuthenticator(DefaultHttpClient client, String username, String password,
URI idpEcpEndpoint, URI spUrl) {
super(client);
authInfo = new ECPAuthenticationInfo(username, password, idpEcpEndpoint, spUrl);
authInfo.setAuthState(ECPAuthState.NOT_STARTED);
}
public ECPAuthenticator(String username, String password,
URI idpEcpEndpoint, URI spUrl) {
this(new DefaultHttpClient(), username, password, idpEcpEndpoint, spUrl);
}
public void authenticate() throws ECPAuthenticationException {
logger.info("Starting authentication");
logger.info("Contacting SP " + authInfo.getSpUrl());
authInfo.setAuthState(ECPAuthState.INITIAL_PAOS_SP);
setChanged();
notifyObservers(authInfo);
logger.info("Sending initial SP Request");
HttpGet httpGet = new HttpGet(authInfo.getSpUrl().toString());
httpGet.setHeader("Accept", "text/html; application/vnd.paos+xml");
httpGet.setHeader("PAOS", "ver='urn:liberty:paos:2003-08';'urn:oasis:names:tc:SAML:2.0:profiles:SSO:ecp'");
HttpResponse httpResponse;
String responseBody;
try {
httpResponse = client.execute(httpGet);
responseBody = EntityUtils.toString(httpResponse.getEntity());
} catch (ClientProtocolException e) {
logger.debug("Initial SP Request failed");
throw new ECPAuthenticationException(e);
} catch (ParseException e) {
logger.debug("Initial SP Request failed");
throw new ECPAuthenticationException(e);
} catch (IOException e) {
logger.debug("Initial SP Request failed");
throw new ECPAuthenticationException(e);
}
Document initResponse;
try {
initResponse = buildDocumentFromString(responseBody);
} catch (IOException e) {
logger.debug("Parsing SP Request failed");
throw new ECPAuthenticationException(e);
} catch (ParserConfigurationException e) {
logger.debug("Parsing SP Request failed");
throw new ECPAuthenticationException(e);
} catch (SAXException e) {
logger.debug("Parsing SP Request failed");
throw new ECPAuthenticationException(e);
}
String relayState;
try {
relayState = (String) queryDocument(initResponse, "//ecp:RelayState", XPathConstants.STRING);
} catch (XPathException e) {
logger.debug("Could not find relay state in PAOS answer from SP");
throw new ECPAuthenticationException(e);
}
logger.info("Got relayState: " + relayState);
String responseConsumerUrl;
try {
responseConsumerUrl = (String) queryDocument(initResponse, "/S:Envelope/S:Header/paos:Request/@responseConsumerURL", XPathConstants.STRING);
} catch (XPathException e) {
logger.debug("Could not find response consumer url in PAOS answer from SP");
throw new ECPAuthenticationException(e);
}
logger.info("Got responseConsumerUrl: " + responseConsumerUrl);
Node firstChild = initResponse.getDocumentElement().getFirstChild();
initResponse.getDocumentElement().removeChild(firstChild);
Document idpResponse = authenticateIdP(initResponse);
String assertionConsumerUrl;
try {
assertionConsumerUrl = (String) queryDocument(idpResponse, "/S:Envelope/S:Header/ecp:Response/@AssertionConsumerServiceURL", XPathConstants.STRING);
} catch (XPathException e) {
logger.debug("Could not find assertion consumer url in answer from IdP");
throw new ECPAuthenticationException(e);
}
logger.info("Got assertionConsumerUrl: " + assertionConsumerUrl);
if (! assertionConsumerUrl.equals(responseConsumerUrl)) {
throw new ECPAuthenticationException("Assertion- and ResponseConsumerURL don't match");
}
idpResponse.getDocumentElement().getFirstChild().getFirstChild().setTextContent(relayState);
logger.info("Sending Assertion to SP");
HttpPost httpPost = new HttpPost(assertionConsumerUrl);
httpPost.setHeader("Content-Type", "application/vnd.paos+xml");
try {
httpPost.setEntity(new StringEntity(documentToString(idpResponse)));
httpResponse = client.execute(httpPost);
responseBody = EntityUtils.toString(httpResponse.getEntity());
} catch (UnsupportedEncodingException e) {
logger.debug("Could not post assertion back to SP");
throw new ECPAuthenticationException(e);
} catch (TransformerConfigurationException e) {
logger.debug("Could not post assertion back to SP");
throw new ECPAuthenticationException(e);
} catch (ClientProtocolException e) {
logger.debug("Could not post assertion back to SP");
throw new ECPAuthenticationException(e);
} catch (ParseException e) {
logger.debug("Could not post assertion back to SP");
throw new ECPAuthenticationException(e);
} catch (TransformerException e) {
logger.debug("Could not post assertion back to SP");
throw new ECPAuthenticationException(e);
} catch (IOException e) {
logger.debug("Could not post assertion back to SP");
throw new ECPAuthenticationException(e);
}
logger.info("Requesting original URL");
httpGet = new HttpGet(authInfo.getSpUrl().toString());
try {
httpResponse = client.execute(httpGet);
responseBody = EntityUtils.toString(httpResponse.getEntity());
logger.info(responseBody);
} catch (ClientProtocolException e) {
logger.debug("Could not request original URL");
throw new ECPAuthenticationException(e);
} catch (ParseException e) {
logger.debug("Could not request original URL");
throw new ECPAuthenticationException(e);
} catch (IOException e) {
logger.debug("Could not request original URL");
throw new ECPAuthenticationException(e);
}
}
}
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