code.grnet.gr Git - pithos/blob - src/gr/ebs/gss/server/Login.java

   1 /*
   2  * Copyright 2008, 2009 Electronic Business Systems Ltd.
   3  *
   4  * This file is part of GSS.
   5  *
   6  * GSS is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * GSS is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with GSS.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19 package gr.ebs.gss.server;
  20
  21 import static gr.ebs.gss.server.configuration.GSSConfigurationFactory.getConfiguration;
  22 import gr.ebs.gss.client.exceptions.DuplicateNameException;
  23 import gr.ebs.gss.client.exceptions.ObjectNotFoundException;
  24 import gr.ebs.gss.client.exceptions.RpcException;
  25 import gr.ebs.gss.server.domain.Nonce;
  26 import gr.ebs.gss.server.domain.User;
  27 import gr.ebs.gss.server.ejb.ExternalAPI;
  28
  29 import java.io.IOException;
  30 import java.io.PrintWriter;
  31 import java.io.UnsupportedEncodingException;
  32 import java.net.URL;
  33 import java.net.URLEncoder;
  34 import java.util.Formatter;
  35
  36 import javax.naming.Context;
  37 import javax.naming.InitialContext;
  38 import javax.naming.NamingException;
  39 import javax.rmi.PortableRemoteObject;
  40 import javax.servlet.http.Cookie;
  41 import javax.servlet.http.HttpServlet;
  42 import javax.servlet.http.HttpServletRequest;
  43 import javax.servlet.http.HttpServletResponse;
  44
  45 import org.apache.commons.codec.binary.Base64;
  46 import org.apache.commons.logging.Log;
  47 import org.apache.commons.logging.LogFactory;
  48
  49 /**
  50  * The servlet that handles user logins.
  51  *
  52  * @author past
  53  */
  54 public class Login extends HttpServlet {
  55         /**
  56          * The request parameter name for the nonce.
  57          */
  58         private static final String NONCE_PARAM = "nonce";
  59
  60         /**
  61          * The request parameter name for the URL to redirect
  62          * to after authentication.
  63          */
  64         private static final String NEXT_URL_PARAM = "next";
  65
  66         /**
  67          * The serial version UID of the class.
  68          */
  69         private static final long serialVersionUID = 1L;
  70
  71         /**
  72          * The name of the authentication cookie.
  73          */
  74         private static final String AUTH_COOKIE = "_gss_a";
  75
  76         /**
  77          * The separator character for the authentication cookie.
  78          */
  79         private static final char COOKIE_SEPARATOR = '|';
  80
  81         /**
  82          * The name of the the webdav cookie.
  83          */
  84         public static final String WEBDAV_COOKIE = "_gss_wd";
  85
  86         /**
  87          * The logger.
  88          */
  89         private static Log logger = LogFactory.getLog(Login.class);
  90
  91         /**
  92          * A helper method that retrieves a reference to the ExternalAPI bean and
  93          * stores it for future use.
  94          *
  95          * @return an ExternalAPI instance
  96          * @throws RpcException in case an error occurs
  97          */
  98         private ExternalAPI getService() throws RpcException {
  99                 try {
 100                         final Context ctx = new InitialContext();
 101                         final Object ref = ctx.lookup(getConfiguration().getString("externalApiPath"));
 102                         return (ExternalAPI) PortableRemoteObject.narrow(ref, ExternalAPI.class);
 103                 } catch (final NamingException e) {
 104                         logger.error("Unable to retrieve the ExternalAPI EJB", e);
 105                         throw new RpcException("An error occurred while contacting the naming service");
 106                 }
 107         }
 108
 109         /**
 110          * Return the name of the service.
 111          */
 112         private String getServiceName() {
 113                 return getConfiguration().getString("serviceName", "GSS");
 114         }
 115
 116         @Override
 117         public void service(HttpServletRequest request, HttpServletResponse response) throws IOException {
 118                 // Fetch the next URL to display, if any.
 119                 String nextUrl = request.getParameter(NEXT_URL_PARAM);
 120                 // Fetch the supplied nonce, if any.
 121                 String nonce = request.getParameter(NONCE_PARAM);
 122                 String[] attrs = new String[] {"REMOTE_USER", "HTTP_SHIB_INETORGPERSON_DISPLAYNAME",
 123                                         "HTTP_SHIB_INETORGPERSON_GIVENNAME", "HTTP_SHIB_PERSON_COMMONNAME",
 124                                         "HTTP_SHIB_PERSON_SURNAME", "HTTP_SHIB_INETORGPERSON_MAIL",
 125                                         "HTTP_SHIB_EP_UNSCOPEDAFFILIATION"};
 126                 StringBuilder buf = new StringBuilder("Shibboleth Attributes\n");
 127                 for (String attr: attrs)
 128                         buf.append(attr+": ").append(request.getAttribute(attr)).append('\n');
 129                 logger.info(buf);
 130                 if (logger.isDebugEnabled()) {
 131                         buf = new StringBuilder("Shibboleth Attributes as bytes\n");
 132                         for (String attr: attrs)
 133                                 if (request.getAttribute(attr) != null)
 134                                         buf.append(attr+": ").append(getHexString(request.getAttribute(attr).toString().getBytes("UTF-8"))).append('\n');
 135                         logger.debug(buf);
 136                 }
 137                 User user = null;
 138                 response.setContentType("text/html");
 139                 Object usernameAttr = request.getAttribute("REMOTE_USER");
 140                 Object nameAttr = request.getAttribute("HTTP_SHIB_INETORGPERSON_DISPLAYNAME");
 141                 Object givennameAttr = request.getAttribute("HTTP_SHIB_INETORGPERSON_GIVENNAME"); // Multi-valued
 142                 Object cnAttr = request.getAttribute("HTTP_SHIB_PERSON_COMMONNAME"); // Multi-valued
 143                 Object snAttr = request.getAttribute("HTTP_SHIB_PERSON_SURNAME"); // Multi-valued
 144                 Object mailAttr = request.getAttribute("HTTP_SHIB_INETORGPERSON_MAIL"); // Multi-valued
 145                 Object userclassAttr = request.getAttribute("HTTP_SHIB_EP_UNSCOPEDAFFILIATION"); // Multi-valued
 146                 if (usernameAttr == null) {
 147                         String authErrorUrl = "authenticationError.jsp";
 148                         authErrorUrl += "?name=" + (nameAttr==null? "-": nameAttr.toString());
 149                         authErrorUrl += "&givenname=" + (givennameAttr==null? "-": givennameAttr.toString());
 150                         authErrorUrl += "&sn=" + (snAttr==null? "-": snAttr.toString());
 151                         authErrorUrl += "&cn=" + (cnAttr==null? "-": cnAttr.toString());
 152                         authErrorUrl += "&mail=" + (mailAttr==null? "-": mailAttr.toString());
 153                         authErrorUrl += "&userclass=" + (userclassAttr==null? "-": userclassAttr.toString());
 154                         response.sendRedirect(authErrorUrl);
 155                         return;
 156                 }
 157                 String username = decodeAttribute(usernameAttr);
 158                 String name;
 159                 if (nameAttr != null && !nameAttr.toString().isEmpty())
 160                         name = decodeAttribute(nameAttr);
 161                 else if (cnAttr != null && !cnAttr.toString().isEmpty()) {
 162                         name = decodeAttribute(cnAttr);
 163                         if (name.indexOf(';') != -1)
 164                                 name = name.substring(0, name.indexOf(';'));
 165                 } else if (givennameAttr != null && snAttr != null && !givennameAttr.toString().isEmpty() && !snAttr.toString().isEmpty()) {
 166                         String givenname = decodeAttribute(givennameAttr);
 167                         if (givenname.indexOf(';') != -1)
 168                                 givenname = givenname.substring(0, givenname.indexOf(';'));
 169                         String sn = decodeAttribute(snAttr);
 170                         if (sn.indexOf(';') != -1)
 171                                 sn = sn.substring(0, sn.indexOf(';'));
 172                         name = givenname + ' ' + sn;
 173                 } else if (givennameAttr == null && snAttr != null && !snAttr.toString().isEmpty()) {
 174                         name = decodeAttribute(snAttr);
 175                         if (name.indexOf(';') != -1)
 176                                 name = name.substring(0, name.indexOf(';'));
 177                 } else
 178                         name = username;
 179                 String mail = mailAttr != null ? mailAttr.toString() : username;
 180                 if (mail.indexOf(';') != -1)
 181                         mail = mail.substring(0, mail.indexOf(';'));
 182                 // XXX we are not using the user class currently
 183                 String userclass = userclassAttr != null ? userclassAttr.toString() : "";
 184                 if (userclass.indexOf(';') != -1)
 185                         userclass = userclass.substring(0, userclass.indexOf(';'));
 186                 try {
 187                         user = getService().findUser(username);
 188                         if (user == null)
 189                                 user = getService().createUser(username, name, mail);
 190                         if (!user.hasAcceptedPolicy()) {
 191                                 String policyUrl = "policy.jsp";
 192                                 if (request.getQueryString() != null)
 193                                         policyUrl += "?user=" + username + "&" + request.getQueryString();
 194                                 response.sendRedirect(policyUrl);
 195                                 return;
 196                         }
 197                         // Update the user name and e-mail if modified.
 198                         boolean update = false;
 199                         if (!user.getName().equals(name)) {
 200                                 user.setName(name);
 201                                 update = true;
 202                         }
 203                         if (!user.getEmail().equals(mail)) {
 204                                 user.setEmail(mail);
 205                                 update = true;
 206                         }
 207                         if (user.getAuthToken() == null)
 208                                 user = getService().updateUserToken(user.getId());
 209                         // Set WebDAV password to token if it's never been set.
 210                         if (user.getWebDAVPassword()==null || user.getWebDAVPassword().length()==0) {
 211                                 String tokenEncoded = new String(Base64.encodeBase64(user.getAuthToken()), "US-ASCII");
 212                                 user.setWebDAVPassword(tokenEncoded);
 213                                 update = true;
 214                         }
 215                         if (update)
 216                                 getService().updateUser(user);
 217                 } catch (RpcException e) {
 218                         String error = "An error occurred while communicating with the service";
 219                         logger.error(error, e);
 220                         response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, error);
 221                         return;
 222                 } catch (DuplicateNameException e) {
 223                         String error = "User with username " + username + " already exists";
 224                         logger.error(error, e);
 225                         response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, error);
 226                         return;
 227                 } catch (ObjectNotFoundException e) {
 228                         String error = "No username was provided";
 229                         logger.error(error, e);
 230                         response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, error);
 231                         return;
 232                 }
 233                 String tokenEncoded = new String(Base64.encodeBase64(user.getAuthToken()), "US-ASCII");
 234                 String userEncoded = URLEncoder.encode(user.getUsername(), "US-ASCII");
 235                 if (logger.isDebugEnabled())
 236                         logger.debug("user: "+userEncoded+" token: "+tokenEncoded);
 237                 if (nextUrl != null) {
 238                         URL next = new URL(nextUrl);
 239                         String domain = next.getHost();
 240                         String path = next.getPath();
 241                         Cookie cookie = new Cookie(AUTH_COOKIE, userEncoded + COOKIE_SEPARATOR +
 242                                                 tokenEncoded);
 243                         cookie.setMaxAge(-1);
 244                         cookie.setDomain(domain);
 245                         cookie.setPath(path);
 246                     response.addCookie(cookie);
 247                     cookie = new Cookie(WEBDAV_COOKIE, user.getWebDAVPassword());
 248                         cookie.setMaxAge(-1);
 249                         cookie.setDomain(domain);
 250                         cookie.setPath(path);
 251                     response.addCookie(cookie);
 252                     response.sendRedirect(nextUrl);
 253                 } else if (nonce != null) {
 254                         nonce = URLEncoder.encode(nonce, "US-ASCII");
 255                         Nonce n = null;
 256                         try {
 257                                 if (logger.isDebugEnabled())
 258                                         logger.debug("user: "+user.getId()+" nonce: "+nonce);
 259                                 n = getService().getNonce(nonce, user.getId());
 260                         } catch (ObjectNotFoundException e) {
 261                             PrintWriter out = response.getWriter();
 262                             out.println("<HTML>");
 263                             out.println("<HEAD><TITLE>" + getServiceName() + " Authentication</TITLE>" +
 264                                         "<LINK TYPE='text/css' REL='stylesheet' HREF='gss.css'></HEAD>");
 265                             out.println("<BODY><CENTER><P>");
 266                             out.println("The supplied nonce could not be found!");
 267                             out.println("</CENTER></BODY></HTML>");
 268                             return;
 269                         } catch (RpcException e) {
 270                                 String error = "An error occurred while communicating with the service";
 271                                 logger.error(error, e);
 272                                 response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, error);
 273                                 return;
 274                         }
 275                         try {
 276                                 getService().activateUserNonce(user.getId(), nonce, n.getNonceExpiryDate());
 277                         } catch (ObjectNotFoundException e) {
 278                                 String error = "Unable to find user";
 279                                 logger.error(error, e);
 280                                 response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, error);
 281                                 return;
 282                         } catch (RpcException e) {
 283                                 String error = "An error occurred while communicating with the service";
 284                                 logger.error(error, e);
 285                                 response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, error);
 286                                 return;
 287                         }
 288                         try {
 289                                 getService().removeNonce(n.getId());
 290                         } catch (ObjectNotFoundException e) {
 291                                 logger.info("Nonce already removed!", e);
 292                         } catch (RpcException e) {
 293                                 logger.warn("Could not remove nonce from data store", e);
 294                         }
 295                     PrintWriter out = response.getWriter();
 296                     out.println("<HTML>");
 297                     out.println("<HEAD><TITLE>" + getServiceName() + " Authentication</TITLE>" +
 298                                 "<LINK TYPE='text/css' REL='stylesheet' HREF='gss.css'></HEAD>");
 299                     out.println("<BODY><CENTER><P>");
 300                     out.println("You can now close this browser window and return to your application.");
 301                     out.println("</CENTER></BODY></HTML>");
 302                 } else {
 303                     PrintWriter out = response.getWriter();
 304                     out.println("<HTML>");
 305                     out.println("<HEAD><TITLE>" + getServiceName() + " Authentication</TITLE>" +
 306                                 "<LINK TYPE='text/css' REL='stylesheet' HREF='gss.css'></HEAD>");
 307                     out.println("<BODY><CENTER><P>");
 308                     out.println("Name: " + user.getName() + "<BR>");
 309                     out.println("E-mail: " + user.getEmail() + "<BR><P>");
 310                     out.println("Username: " + user.getUsername() + "<BR>");
 311                     out.println("Athentication token: " + tokenEncoded + "<BR>");
 312                     out.println("</CENTER></BODY></HTML>");
 313                 }
 314         }
 315
 316         /**
 317          * Decode the request attribute provided by the container to a UTF-8
 318          * string, since GSS assumes all data to be encoded in UTF-8. The
 319          * servlet container's encoding can be specified in gss.properties.
 320          */
 321         private String decodeAttribute(Object attribute) throws UnsupportedEncodingException {
 322                 return new String(attribute.toString().getBytes(getConfiguration().getString("requestAttributeEncoding")), "UTF-8");
 323         }
 324
 325         /**
 326          * A helper method that converts a byte buffer to a printable list of
 327          * hexadecimal numbers.
 328          */
 329         private String getHexString(byte[] buffer) {
 330                 StringBuilder sb = new StringBuilder();
 331                 Formatter formatter = new Formatter(sb);
 332                 for (int i=0; i<buffer.length; i++)
 333                         formatter.format("0x%x, ", buffer[i]);
 334                 return sb.toString();
 335         }
 336
 337 }