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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.hc.client5.http.auth.AuthenticationException;
import org.apache.hc.client5.http.auth.UsernamePasswordCredentials;
import org.apache.hc.client5.http.classic.methods.HttpPost;
import org.apache.hc.client5.http.impl.auth.BasicScheme;
import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
import org.apache.hc.client5.http.impl.classic.CloseableHttpResponse;
import org.apache.hc.client5.http.impl.classic.HttpClients;
import org.apache.hc.client5.http.protocol.HttpClientContext;
import org.apache.hc.core5.http.HttpHeaders;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.core5.http.HttpStatus;
import org.apache.hc.core5.http.ParseException;
import org.apache.hc.core5.http.io.entity.EntityUtils;
import org.apache.hc.core5.http.io.entity.StringEntity;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
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 Logger logger = LogManager.getLogger(ECPAuthenticatorBase.class);
protected ECPAuthenticationInfo authInfo;
protected CloseableHttpClient client;
protected DocumentBuilderFactory documentBuilderFactory;
protected XPathFactory xpathFactory;
protected NamespaceResolver namespaceResolver;
protected TransformerFactory transformerFactory;
protected boolean retryWithoutAt;
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);
}
private CloseableHttpResponse exec(Document idpRequest, String user, String pass)
throws ECPAuthenticationException {
final HttpHost httpHost = HttpHost.create(authInfo.getSpUrl());
// setup basic authentication
final UsernamePasswordCredentials userCredentials = new UsernamePasswordCredentials(user, pass.toCharArray());
final BasicScheme basicAuth = new BasicScheme();
basicAuth.initPreemptive(userCredentials);
// create local HTTP context for basic authentication
final HttpClientContext httpContext = HttpClientContext.create();
httpContext.resetAuthExchange(httpHost, basicAuth);
// create POST request to IdP
final HttpPost httpPost = new HttpPost(authInfo.getIdpEcpEndpoint().toString());
// fill content of POST request
try {
httpPost.setEntity(new StringEntity(documentToString(idpRequest)));
} catch (TransformerException e1) {
logger.warn("Error setting XML payload of IdP POST");
throw new ECPAuthenticationException(e1);
}
// set content type of POST request
httpPost.setHeader(HttpHeaders.CONTENT_TYPE, "text/xml; charset=utf-8");
// set basic authentication header for POST request
try {
httpPost.setHeader(HttpHeaders.AUTHORIZATION, basicAuth.generateAuthResponse(httpHost, httpPost, httpContext));
} catch (AuthenticationException e) {
logger.warn("Error setting Authentication header for IdP POST");
throw new ECPAuthenticationException(e);
}
// send POST request to IdP
try {
return client.execute(httpPost, httpContext);
} catch (Exception e) {
httpPost.reset();
logger.error("Could not submit PAOS request to IdP");
throw new ECPAuthenticationException(e);
}
}
protected Document authenticateIdP(Document idpRequest) throws ECPAuthenticationException {
logger.info("Sending initial IdP Request");
CloseableHttpResponse httpResponse = null;
String user = authInfo.getUsername();
String pass = authInfo.getPassword();
int at = user.lastIndexOf('@');
boolean failed = false;
try {
httpResponse = exec(idpRequest, user, pass);
failed = (httpResponse.getCode() == HttpStatus.SC_UNAUTHORIZED);
} catch (ECPAuthenticationException e) {
logger.debug("Could not submit PAOS request to IdP");
if (at == -1)
throw new ECPAuthenticationException(e);
failed = true;
}
if (at != -1 && failed && retryWithoutAt) {
// Retrying without the @ in the username is desired
user = user.substring(0, at);
try {
httpResponse = exec(idpRequest, user, pass);
} catch (ECPAuthenticationException e) {
logger.debug("Could not submit PAOS request to IdP");
throw new ECPAuthenticationException(e);
}
}
String responseBody;
try {
responseBody = EntityUtils.toString(httpResponse.getEntity());
} catch (RuntimeException | IOException | ParseException e) {
logger.debug("Could not read response from IdP");
throw new ECPAuthenticationException(e);
}
try {
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;
}
public void setRetryWithoutAt(boolean b) {
this.retryWithoutAt = b;
}
}
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