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/*
* Copyright (c) 2014, 2015 Hewlett-Packard Development Company, L.P. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.aaa.federation;
import static javax.servlet.http.HttpServletResponse.SC_CREATED;
import static javax.servlet.http.HttpServletResponse.SC_UNAUTHORIZED;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.oltu.oauth2.as.issuer.OAuthIssuer;
import org.apache.oltu.oauth2.as.issuer.OAuthIssuerImpl;
import org.apache.oltu.oauth2.as.issuer.UUIDValueGenerator;
import org.apache.oltu.oauth2.as.response.OAuthASResponse;
import org.apache.oltu.oauth2.common.exception.OAuthSystemException;
import org.apache.oltu.oauth2.common.message.OAuthResponse;
import org.opendaylight.aaa.AuthenticationBuilder;
import org.opendaylight.aaa.ClaimBuilder;
import org.opendaylight.aaa.api.Authentication;
import org.opendaylight.aaa.api.AuthenticationException;
import org.opendaylight.aaa.api.Claim;
/**
* An endpoint for claim-based authentication federation (in-bound).
*
* @author liemmn
*
*/
public class FederationEndpoint extends HttpServlet {
private static final long serialVersionUID = -5553885846238987245L;
/** An in-bound authentication claim */
static final String AUTH_CLAIM = "AAA-CLAIM";
private static final String UNAUTHORIZED = "unauthorized";
private transient OAuthIssuer oi;
@Override
public void init(ServletConfig config) throws ServletException {
oi = new OAuthIssuerImpl(new UUIDValueGenerator());
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException,
ServletException {
try {
createRefreshToken(req, resp);
} catch (Exception e) {
error(resp, SC_UNAUTHORIZED, e.getMessage());
}
}
// Create a refresh token
private void createRefreshToken(HttpServletRequest req, HttpServletResponse resp)
throws OAuthSystemException, IOException {
Claim claim = (Claim) req.getAttribute(AUTH_CLAIM);
oauthRefreshTokenResponse(resp, claim);
}
// Build OAuth refresh token response from the given claim mapped and
// injected by the external IdP
private void oauthRefreshTokenResponse(HttpServletResponse resp, Claim claim)
throws OAuthSystemException, IOException {
if (claim == null) {
throw new AuthenticationException(UNAUTHORIZED);
}
String userName = claim.user();
// Need to have at least a mapped username!
if (userName == null) {
throw new AuthenticationException(UNAUTHORIZED);
}
String domain = claim.domain();
// Need to have at least a domain!
if (domain == null) {
throw new AuthenticationException(UNAUTHORIZED);
}
String userId = userName + "@" + domain;
// Create an unscoped ODL context from the external claim
Authentication auth = new AuthenticationBuilder(new ClaimBuilder(claim).setUserId(userId)
.build()).setExpiration(tokenExpiration()).build();
// Create OAuth response
String token = oi.refreshToken();
OAuthResponse r = OAuthASResponse
.tokenResponse(SC_CREATED)
.setRefreshToken(token)
.setExpiresIn(Long.toString(auth.expiration()))
.setScope(
// Use mapped domain if there is one, else list
// all the ones that this user has access to
(claim.domain().isEmpty()) ? listToString(ServiceLocator.getInstance()
.getIdmService().listDomains(userId)) : claim.domain())
.buildJSONMessage();
// Cache this token...
ServiceLocator.getInstance().getTokenStore().put(token, auth);
write(resp, r);
}
// Token expiration
private long tokenExpiration() {
return ServiceLocator.getInstance().getTokenStore().tokenExpiration();
}
// Space-delimited string from a list of strings
private String listToString(List<String> list) {
StringBuffer sb = new StringBuffer();
for (String s : list) {
sb.append(s).append(" ");
}
return sb.toString().trim();
}
// Emit an error OAuthResponse with the given HTTP code
private void error(HttpServletResponse resp, int httpCode, String error) {
try {
OAuthResponse r = OAuthResponse.errorResponse(httpCode).setError(error)
.buildJSONMessage();
write(resp, r);
} catch (Exception e1) {
// Nothing to do here
}
}
// Write out an OAuthResponse
private void write(HttpServletResponse resp, OAuthResponse r) throws IOException {
resp.setStatus(r.getResponseStatus());
PrintWriter pw = resp.getWriter();
pw.print(r.getBody());
pw.flush();
pw.close();
}
}
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