DataHttp.java

   1 package org.argeo.cms.internal.kernel;
   2
   3 import static org.argeo.cms.auth.AuthConstants.LOGIN_CONTEXT_USER;
   4
   5 import java.io.IOException;
   6 import java.io.Serializable;
   7 import java.net.URL;
   8 import java.security.PrivilegedActionException;
   9 import java.security.PrivilegedExceptionAction;
  10 import java.util.Properties;
  11 import java.util.StringTokenizer;
  12
  13 import javax.jcr.Repository;
  14 import javax.jcr.RepositoryException;
  15 import javax.jcr.Session;
  16 import javax.security.auth.Subject;
  17 import javax.security.auth.callback.Callback;
  18 import javax.security.auth.callback.CallbackHandler;
  19 import javax.security.auth.callback.NameCallback;
  20 import javax.security.auth.callback.PasswordCallback;
  21 import javax.security.auth.login.CredentialNotFoundException;
  22 import javax.security.auth.login.LoginContext;
  23 import javax.security.auth.login.LoginException;
  24 import javax.servlet.ServletException;
  25 import javax.servlet.http.HttpServletRequest;
  26 import javax.servlet.http.HttpServletResponse;
  27
  28 import org.apache.commons.codec.binary.Base64;
  29 import org.apache.commons.logging.Log;
  30 import org.apache.commons.logging.LogFactory;
  31 import org.apache.jackrabbit.server.SessionProvider;
  32 import org.apache.jackrabbit.server.remoting.davex.JcrRemotingServlet;
  33 import org.apache.jackrabbit.webdav.simple.SimpleWebdavServlet;
  34 import org.argeo.cms.CmsException;
  35 import org.argeo.cms.auth.AuthConstants;
  36 import org.argeo.cms.auth.HttpRequestCallback;
  37 import org.argeo.cms.auth.HttpRequestCallbackHandler;
  38 import org.argeo.jcr.ArgeoJcrConstants;
  39 import org.argeo.jcr.JcrUtils;
  40 import org.osgi.service.http.HttpContext;
  41 import org.osgi.service.http.HttpService;
  42 import org.osgi.service.http.NamespaceException;
  43 import org.osgi.service.useradmin.Authorization;
  44
  45 /**
  46  * Intercepts and enriches http access, mainly focusing on security and
  47  * transactionality.
  48  */
  49 class DataHttp implements KernelConstants, ArgeoJcrConstants {
  50         private final static Log log = LogFactory.getLog(DataHttp.class);
  51
  52         // private final static String ATTR_AUTH = "auth";
  53         private final static String HEADER_AUTHORIZATION = "Authorization";
  54         private final static String HEADER_WWW_AUTHENTICATE = "WWW-Authenticate";
  55
  56         private final HttpService httpService;
  57
  58         // FIXME Make it more unique
  59         private String httpAuthRealm = "Argeo";
  60
  61         // WebDav / JCR remoting
  62         private OpenInViewSessionProvider sessionProvider;
  63
  64         DataHttp(HttpService httpService) {
  65                 this.httpService = httpService;
  66                 sessionProvider = new OpenInViewSessionProvider();
  67                 // registerRepositoryServlets(ALIAS_NODE, node);
  68         }
  69
  70         public void destroy() {
  71                 // unregisterRepositoryServlets(ALIAS_NODE);
  72         }
  73
  74         void registerRepositoryServlets(String alias, Repository repository) {
  75                 try {
  76                         registerWebdavServlet(alias, repository, true);
  77                         registerWebdavServlet(alias, repository, false);
  78                         registerRemotingServlet(alias, repository, true);
  79                         registerRemotingServlet(alias, repository, false);
  80                 } catch (Exception e) {
  81                         throw new CmsException("Could not register servlets for repository " + alias, e);
  82                 }
  83         }
  84
  85         void unregisterRepositoryServlets(String alias) {
  86                 // FIXME unregister servlets
  87         }
  88
  89         void registerWebdavServlet(String alias, Repository repository, boolean anonymous)
  90                         throws NamespaceException, ServletException {
  91                 WebdavServlet webdavServlet = new WebdavServlet(repository, sessionProvider);
  92                 String pathPrefix = anonymous ? WEBDAV_PUBLIC : WEBDAV_PRIVATE;
  93                 String path = pathPrefix + "/" + alias;
  94                 Properties ip = new Properties();
  95                 ip.setProperty(WebdavServlet.INIT_PARAM_RESOURCE_CONFIG, WEBDAV_CONFIG);
  96                 ip.setProperty(WebdavServlet.INIT_PARAM_RESOURCE_PATH_PREFIX, path);
  97                 httpService.registerServlet(path, webdavServlet, ip, new DataHttpContext(anonymous));
  98         }
  99
 100         void registerRemotingServlet(String alias, Repository repository, boolean anonymous)
 101                         throws NamespaceException, ServletException {
 102                 String pathPrefix = anonymous ? REMOTING_PUBLIC : REMOTING_PRIVATE;
 103                 RemotingServlet remotingServlet = new RemotingServlet(repository, sessionProvider);
 104                 String path = pathPrefix + "/" + alias;
 105                 Properties ip = new Properties();
 106                 ip.setProperty(JcrRemotingServlet.INIT_PARAM_RESOURCE_PATH_PREFIX, path);
 107
 108                 // Looks like a bug in Jackrabbit remoting init
 109                 ip.setProperty(RemotingServlet.INIT_PARAM_HOME, KernelUtils.getOsgiInstanceDir() + "/tmp/jackrabbit");
 110                 ip.setProperty(RemotingServlet.INIT_PARAM_TMP_DIRECTORY, "remoting");
 111                 // in order to avoid annoying warning.
 112                 ip.setProperty(RemotingServlet.INIT_PARAM_PROTECTED_HANDLERS_CONFIG, "");
 113                 httpService.registerServlet(path, remotingServlet, ip, new DataHttpContext(anonymous));
 114         }
 115
 116         private Subject subjectFromRequest(HttpServletRequest request) {
 117                 Authorization authorization = (Authorization) request.getAttribute(HttpContext.AUTHORIZATION);
 118                 if (authorization == null)
 119                         throw new CmsException("Not authenticated");
 120                 try {
 121                         LoginContext lc = new LoginContext(AuthConstants.LOGIN_CONTEXT_USER,
 122                                         new HttpRequestCallbackHandler(request));
 123                         lc.login();
 124                         return lc.getSubject();
 125                 } catch (LoginException e) {
 126                         throw new CmsException("Cannot login", e);
 127                 }
 128         }
 129
 130         private class DataHttpContext implements HttpContext {
 131                 private final boolean anonymous;
 132
 133                 DataHttpContext(boolean anonymous) {
 134                         this.anonymous = anonymous;
 135                 }
 136
 137                 @Override
 138                 public boolean handleSecurity(final HttpServletRequest request, HttpServletResponse response)
 139                                 throws IOException {
 140
 141                         if (anonymous) {
 142                                 Subject subject = KernelUtils.anonymousLogin();
 143                                 Authorization authorization = subject.getPrivateCredentials(Authorization.class).iterator().next();
 144                                 request.setAttribute(REMOTE_USER, AuthConstants.ROLE_ANONYMOUS);
 145                                 request.setAttribute(AUTHORIZATION, authorization);
 146                                 return true;
 147                         }
 148
 149                         if (log.isTraceEnabled())
 150                                 KernelUtils.logRequestHeaders(log, request);
 151                         try {
 152                                 new LoginContext(LOGIN_CONTEXT_USER, new HttpRequestCallbackHandler(request)).login();
 153                                 return true;
 154                         } catch (CredentialNotFoundException e) {
 155                                 CallbackHandler token = basicAuth(request);
 156                                 if (token != null) {
 157                                         try {
 158                                                 LoginContext lc = new LoginContext(LOGIN_CONTEXT_USER, token);
 159                                                 lc.login();
 160                                                 // Note: this is impossible to reliably clear the
 161                                                 // authorization header when access from a browser.
 162                                                 return true;
 163                                         } catch (LoginException e1) {
 164                                                 throw new CmsException("Could not login", e1);
 165                                         }
 166                                 } else {
 167                                         String path = request.getServletPath();
 168                                         if (path.startsWith(REMOTING_PRIVATE))
 169                                                 requestBasicAuth(request, response);
 170                                         return false;
 171                                 }
 172                         } catch (LoginException e) {
 173                                 throw new CmsException("Could not login", e);
 174                         }
 175                 }
 176
 177                 @Override
 178                 public URL getResource(String name) {
 179                         return Activator.getBundleContext().getBundle().getResource(name);
 180                 }
 181
 182                 @Override
 183                 public String getMimeType(String name) {
 184                         return null;
 185                 }
 186
 187                 private void requestBasicAuth(HttpServletRequest request, HttpServletResponse response) {
 188                         response.setStatus(401);
 189                         response.setHeader(HEADER_WWW_AUTHENTICATE, "basic realm=\"" + httpAuthRealm + "\"");
 190                         // request.getSession().setAttribute(ATTR_AUTH, Boolean.TRUE);
 191                 }
 192
 193                 private CallbackHandler basicAuth(final HttpServletRequest httpRequest) {
 194                         String authHeader = httpRequest.getHeader(HEADER_AUTHORIZATION);
 195                         if (authHeader != null) {
 196                                 StringTokenizer st = new StringTokenizer(authHeader);
 197                                 if (st.hasMoreTokens()) {
 198                                         String basic = st.nextToken();
 199                                         if (basic.equalsIgnoreCase("Basic")) {
 200                                                 try {
 201                                                         // TODO manipulate char[]
 202                                                         String credentials = new String(Base64.decodeBase64(st.nextToken()), "UTF-8");
 203                                                         // log.debug("Credentials: " + credentials);
 204                                                         int p = credentials.indexOf(":");
 205                                                         if (p != -1) {
 206                                                                 final String login = credentials.substring(0, p).trim();
 207                                                                 final char[] password = credentials.substring(p + 1).trim().toCharArray();
 208                                                                 return new CallbackHandler() {
 209                                                                         public void handle(Callback[] callbacks) {
 210                                                                                 for (Callback cb : callbacks) {
 211                                                                                         if (cb instanceof NameCallback)
 212                                                                                                 ((NameCallback) cb).setName(login);
 213                                                                                         else if (cb instanceof PasswordCallback)
 214                                                                                                 ((PasswordCallback) cb).setPassword(password);
 215                                                                                         else if (cb instanceof HttpRequestCallback)
 216                                                                                                 ((HttpRequestCallback) cb).setRequest(httpRequest);
 217                                                                                 }
 218                                                                         }
 219                                                                 };
 220                                                         } else {
 221                                                                 throw new CmsException("Invalid authentication token");
 222                                                         }
 223                                                 } catch (Exception e) {
 224                                                         throw new CmsException("Couldn't retrieve authentication", e);
 225                                                 }
 226                                         }
 227                                 }
 228                         }
 229                         return null;
 230                 }
 231
 232         }
 233
 234         /**
 235          * Implements an open session in view patter: a new JCR session is created
 236          * for each request
 237          */
 238         private class OpenInViewSessionProvider implements SessionProvider, Serializable {
 239                 private static final long serialVersionUID = 2270957712453841368L;
 240
 241                 public Session getSession(HttpServletRequest request, Repository rep, String workspace)
 242                                 throws javax.jcr.LoginException, ServletException, RepositoryException {
 243                         return login(request, rep, workspace);
 244                 }
 245
 246                 protected Session login(HttpServletRequest request, Repository repository, String workspace)
 247                                 throws RepositoryException {
 248                         if (log.isTraceEnabled())
 249                                 log.trace("Login to workspace " + (workspace == null ? "<default>" : workspace) + " in web session "
 250                                                 + request.getSession().getId());
 251                         return repository.login(workspace);
 252                 }
 253
 254                 public void releaseSession(Session session) {
 255                         JcrUtils.logoutQuietly(session);
 256                         if (log.isTraceEnabled())
 257                                 log.trace("Logged out remote JCR session " + session);
 258                 }
 259         }
 260
 261         private class WebdavServlet extends SimpleWebdavServlet {
 262                 private static final long serialVersionUID = -4687354117811443881L;
 263                 private final Repository repository;
 264
 265                 public WebdavServlet(Repository repository, SessionProvider sessionProvider) {
 266                         this.repository = repository;
 267                         setSessionProvider(sessionProvider);
 268                 }
 269
 270                 public Repository getRepository() {
 271                         return repository;
 272                 }
 273
 274                 @Override
 275                 protected void service(final HttpServletRequest request, final HttpServletResponse response)
 276                                 throws ServletException, IOException {
 277                         try {
 278                                 Subject subject = subjectFromRequest(request);
 279                                 // TODO make it stronger, with eTags.
 280                                 // if (CurrentUser.isAnonymous(subject) &&
 281                                 // request.getMethod().equals("GET")) {
 282                                 // response.setHeader("Cache-Control", "no-transform, public,
 283                                 // max-age=300, s-maxage=900");
 284                                 // }
 285
 286                                 Subject.doAs(subject, new PrivilegedExceptionAction<Void>() {
 287                                         @Override
 288                                         public Void run() throws Exception {
 289                                                 WebdavServlet.super.service(request, response);
 290                                                 return null;
 291                                         }
 292                                 });
 293                         } catch (PrivilegedActionException e) {
 294                                 throw new CmsException("Cannot process webdav request", e.getException());
 295                         }
 296                 }
 297         }
 298
 299         private class RemotingServlet extends JcrRemotingServlet {
 300                 private static final long serialVersionUID = 4605238259548058883L;
 301                 private final Repository repository;
 302                 private final SessionProvider sessionProvider;
 303
 304                 public RemotingServlet(Repository repository, SessionProvider sessionProvider) {
 305                         this.repository = repository;
 306                         this.sessionProvider = sessionProvider;
 307                 }
 308
 309                 @Override
 310                 protected Repository getRepository() {
 311                         return repository;
 312                 }
 313
 314                 @Override
 315                 protected SessionProvider getSessionProvider() {
 316                         return sessionProvider;
 317                 }
 318
 319                 @Override
 320                 protected void service(final HttpServletRequest request, final HttpServletResponse response)
 321                                 throws ServletException, IOException {
 322                         try {
 323                                 Subject subject = subjectFromRequest(request);
 324                                 Subject.doAs(subject, new PrivilegedExceptionAction<Void>() {
 325                                         @Override
 326                                         public Void run() throws Exception {
 327                                                 RemotingServlet.super.service(request, response);
 328                                                 return null;
 329                                         }
 330                                 });
 331                         } catch (PrivilegedActionException e) {
 332                                 throw new CmsException("Cannot process JCR remoting request", e.getException());
 333                         }
 334                 }
 335         }
 336 }