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package edu.kit.scc.dei.ecplean;
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.Observable;
import javax.xml.namespace.QName;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathException;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.w3c.dom.Document;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
public abstract class ECPAuthenticatorBase extends Observable {
protected static Log logger = LogFactory.getLog(ECPAuthenticatorBase.class);
protected ECPAuthenticationInfo authInfo;
protected CloseableHttpClient client;
protected DocumentBuilderFactory documentBuilderFactory;
protected XPathFactory xpathFactory;
protected NamespaceResolver namespaceResolver;
protected TransformerFactory transformerFactory;
public ECPAuthenticatorBase(CloseableHttpClient client) {
this.client = client == null ? HttpClients.createSystem() : client;
documentBuilderFactory = DocumentBuilderFactory.newInstance();
documentBuilderFactory.setNamespaceAware(true);
xpathFactory = XPathFactory.newInstance();
namespaceResolver = new NamespaceResolver();
namespaceResolver.addNamespace("ecp", "urn:oasis:names:tc:SAML:2.0:profiles:SSO:ecp");
namespaceResolver.addNamespace("S", "http://schemas.xmlsoap.org/soap/envelope/");
namespaceResolver.addNamespace("paos", "urn:liberty:paos:2003-08");
transformerFactory = TransformerFactory.newInstance();
}
public ECPAuthenticatorBase() {
this(null);
}
protected Document authenticateIdP(Document idpRequest)
throws ECPAuthenticationException {
logger.info("Sending initial IdP Request");
BasicCredentialsProvider bcp = new BasicCredentialsProvider();
bcp.setCredentials(new AuthScope(authInfo.getIdpEcpEndpoint().getHost(), authInfo.getIdpEcpEndpoint().getPort()),
new UsernamePasswordCredentials(authInfo.getUsername(), authInfo.getPassword()));
HttpClientContext passwordContext = HttpClientContext.create();
passwordContext.setCredentialsProvider(bcp);
HttpPost httpPost = new HttpPost(authInfo.getIdpEcpEndpoint().toString());
HttpResponse httpResponse;
try {
httpPost.setEntity(new StringEntity(documentToString(idpRequest)));
httpPost.setHeader("Content-Type", "text/xml; charset=utf-8");
httpResponse = client.execute(httpPost, passwordContext);
if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_UNAUTHORIZED) {
throw new ECPAuthenticationException("User not authorized");
}
} catch (Exception e) {
httpPost.reset();
logger.debug("Could not submit PAOS request to IdP");
throw new ECPAuthenticationException(e);
}
String responseBody;
try {
responseBody = EntityUtils.toString(httpResponse.getEntity());
} catch (RuntimeException | IOException e) {
logger.debug("Could not read response from IdP");
throw new ECPAuthenticationException(e);
}
try {
httpPost.reset();
return buildDocumentFromString(responseBody);
} catch (IOException | SAXException | ParserConfigurationException | RuntimeException e) {
logger.debug("Could not parse XML response from IdP:\n" + responseBody);
throw new ECPAuthenticationException(e);
}
}
protected Document buildDocumentFromString(String input)
throws IOException, ParserConfigurationException, SAXException {
DocumentBuilder builder = documentBuilderFactory.newDocumentBuilder();
builder.setEntityResolver(new EntityResolver() {
@Override
public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException {
return new InputSource(new StringReader(""));
}
});
return builder.parse(new InputSource(new StringReader(input)));
}
protected Object queryDocument(Document xmlDocument, String expression,
QName returnType) throws XPathException {
XPath xpath = xpathFactory.newXPath();
xpath.setNamespaceContext(namespaceResolver);
XPathExpression xPathExpression = xpath.compile(expression);
return xPathExpression.evaluate(xmlDocument, returnType);
}
protected String documentToString(Document xmlDocument)
throws TransformerConfigurationException, TransformerException {
Transformer transformer = transformerFactory.newTransformer();
StreamResult result = new StreamResult(new StringWriter());
DOMSource source = new DOMSource(xmlDocument);
transformer.transform(source, result);
return result.getWriter().toString();
}
public CloseableHttpClient getHttpClient() {
return client;
}
}
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