/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.security.token.delegation.web;
import java.io.IOException;
import java.io.Writer;
import java.text.MessageFormat;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.core.MediaType;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.authentication.client.AuthenticationException;
import org.apache.hadoop.security.authentication.server.AuthenticationHandler;
import org.apache.hadoop.security.authentication.server.AuthenticationToken;
import org.apache.hadoop.security.authentication.server.KerberosAuthenticationHandler;
import org.apache.hadoop.security.authorize.AuthorizationException;
import org.apache.hadoop.security.authorize.ProxyUsers;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenIdentifier;
import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager;
import org.apache.hadoop.util.HttpExceptionUtils;
import org.apache.hadoop.util.StringUtils;
import org.codehaus.jackson.map.ObjectMapper;
import com.google.common.annotations.VisibleForTesting;
/**
* An {@link AuthenticationHandler} that implements Kerberos SPNEGO mechanism
* for HTTP and supports Delegation Token functionality.
* <p/>
* In addition to the wrapped {@link AuthenticationHandler} configuration
* properties, this handler supports the following properties prefixed
* with the type of the wrapped <code>AuthenticationHandler</code>:
* <ul>
* <li>delegation-token.token-kind: the token kind for generated tokens
* (no default, required property).</li>
* <li>delegation-token.update-interval.sec: secret manager master key
* update interval in seconds (default 1 day).</li>
* <li>delegation-token.max-lifetime.sec: maximum life of a delegation
* token in seconds (default 7 days).</li>
* <li>delegation-token.renewal-interval.sec: renewal interval for
* delegation tokens in seconds (default 1 day).</li>
* <li>delegation-token.removal-scan-interval.sec: delegation tokens
* removal scan interval in seconds (default 1 hour).</li>
* </ul>
*
*/
@InterfaceAudience.Private
@InterfaceStability.Evolving
public abstract class DelegationTokenAuthenticationHandler
implements AuthenticationHandler {
protected static final String TYPE_POSTFIX = "-dt";
public static final String PREFIX = "delegation-token.";
public static final String TOKEN_KIND = PREFIX + "token-kind";
private static final Set<String> DELEGATION_TOKEN_OPS = new HashSet<String>();
public static final String DELEGATION_TOKEN_UGI_ATTRIBUTE =
"hadoop.security.delegation-token.ugi";
static {
DELEGATION_TOKEN_OPS.add(KerberosDelegationTokenAuthenticator.
DelegationTokenOperation.GETDELEGATIONTOKEN.toString());
DELEGATION_TOKEN_OPS.add(KerberosDelegationTokenAuthenticator.
DelegationTokenOperation.RENEWDELEGATIONTOKEN.toString());
DELEGATION_TOKEN_OPS.add(KerberosDelegationTokenAuthenticator.
DelegationTokenOperation.CANCELDELEGATIONTOKEN.toString());
}
private AuthenticationHandler authHandler;
private DelegationTokenManager tokenManager;
private String authType;
public DelegationTokenAuthenticationHandler(AuthenticationHandler handler) {
authHandler = handler;
authType = handler.getType();
}
@VisibleForTesting
DelegationTokenManager getTokenManager() {
return tokenManager;
}
@Override
public void init(Properties config) throws ServletException {
authHandler.init(config);
initTokenManager(config);
}
/**
* Sets an external <code>DelegationTokenSecretManager</code> instance to
* manage creation and verification of Delegation Tokens.
* <p/>
* This is useful for use cases where secrets must be shared across multiple
* services.
*
* @param secretManager a <code>DelegationTokenSecretManager</code> instance
*/
public void setExternalDelegationTokenSecretManager(
AbstractDelegationTokenSecretManager secretManager) {
tokenManager.setExternalDelegationTokenSecretManager(secretManager);
}
@VisibleForTesting
@SuppressWarnings("unchecked")
public void initTokenManager(Properties config) {
Configuration conf = new Configuration(false);
for (Map.Entry entry : config.entrySet()) {
conf.set((String) entry.getKey(), (String) entry.getValue());
}
String tokenKind = conf.get(TOKEN_KIND);
if (tokenKind == null) {
throw new IllegalArgumentException(
"The configuration does not define the token kind");
}
tokenKind = tokenKind.trim();
tokenManager = new DelegationTokenManager(conf, new Text(tokenKind));
tokenManager.init();
}
@Override
public void destroy() {
tokenManager.destroy();
authHandler.destroy();
}
@Override
public String getType() {
return authType;
}
private static final String ENTER = System.getProperty("line.separator");
@Override
@SuppressWarnings("unchecked")
public boolean managementOperation(AuthenticationToken token,
HttpServletRequest request, HttpServletResponse response)
throws IOException, AuthenticationException {
boolean requestContinues = true;
String op = ServletUtils.getParameter(request,
KerberosDelegationTokenAuthenticator.OP_PARAM);
op = (op != null) ? StringUtils.toUpperCase(op) : null;
if (DELEGATION_TOKEN_OPS.contains(op) &&
!request.getMethod().equals("OPTIONS")) {
KerberosDelegationTokenAuthenticator.DelegationTokenOperation dtOp =
KerberosDelegationTokenAuthenticator.
DelegationTokenOperation.valueOf(op);
if (dtOp.getHttpMethod().equals(request.getMethod())) {
boolean doManagement;
if (dtOp.requiresKerberosCredentials() && token == null) {
// Don't authenticate via DT for DT ops.
token = authHandler.authenticate(request, response);
if (token == null) {
requestContinues = false;
doManagement = false;
} else {
doManagement = true;
}
} else {
doManagement = true;
}
if (doManagement) {
UserGroupInformation requestUgi = (token != null)
? UserGroupInformation.createRemoteUser(token.getUserName())
: null;
// Create the proxy user if doAsUser exists
String doAsUser = DelegationTokenAuthenticationFilter.getDoAs(request);
if (requestUgi != null && doAsUser != null) {
requestUgi = UserGroupInformation.createProxyUser(
doAsUser, requestUgi);
try {
ProxyUsers.authorize(requestUgi, request.getRemoteHost());
} catch (AuthorizationException ex) {
HttpExceptionUtils.createServletExceptionResponse(response,
HttpServletResponse.SC_FORBIDDEN, ex);
return false;
}
}
Map map = null;
switch (dtOp) {
case GETDELEGATIONTOKEN:
if (requestUgi == null) {
throw new IllegalStateException("request UGI cannot be NULL");
}
String renewer = ServletUtils.getParameter(request,
KerberosDelegationTokenAuthenticator.RENEWER_PARAM);
try {
Token<?> dToken = tokenManager.createToken(requestUgi, renewer);
map = delegationTokenToJSON(dToken);
} catch (IOException ex) {
throw new AuthenticationException(ex.toString(), ex);
}
break;
case RENEWDELEGATIONTOKEN:
if (requestUgi == null) {
throw new IllegalStateException("request UGI cannot be NULL");
}
String tokenToRenew = ServletUtils.getParameter(request,
KerberosDelegationTokenAuthenticator.TOKEN_PARAM);
if (tokenToRenew == null) {
response.sendError(HttpServletResponse.SC_BAD_REQUEST,
MessageFormat.format(
"Operation [{0}] requires the parameter [{1}]", dtOp,
KerberosDelegationTokenAuthenticator.TOKEN_PARAM)
);
requestContinues = false;
} else {
Token<AbstractDelegationTokenIdentifier> dt = new Token();
try {
dt.decodeFromUrlString(tokenToRenew);
long expirationTime = tokenManager.renewToken(dt,
requestUgi.getShortUserName());
map = new HashMap();
map.put("long", expirationTime);
} catch (IOException ex) {
throw new AuthenticationException(ex.toString(), ex);
}
}
break;
case CANCELDELEGATIONTOKEN:
String tokenToCancel = ServletUtils.getParameter(request,
KerberosDelegationTokenAuthenticator.TOKEN_PARAM);
if (tokenToCancel == null) {
response.sendError(HttpServletResponse.SC_BAD_REQUEST,
MessageFormat.format(
"Operation [{0}] requires the parameter [{1}]", dtOp,
KerberosDelegationTokenAuthenticator.TOKEN_PARAM)
);
requestContinues = false;
} else {
Token<AbstractDelegationTokenIdentifier> dt = new Token();
try {
dt.decodeFromUrlString(tokenToCancel);
tokenManager.cancelToken(dt, (requestUgi != null)
? requestUgi.getShortUserName() : null);
} catch (IOException ex) {
response.sendError(HttpServletResponse.SC_NOT_FOUND,
"Invalid delegation token, cannot cancel");
requestContinues = false;
}
}
break;
}
if (requestContinues) {
response.setStatus(HttpServletResponse.SC_OK);
if (map != null) {
response.setContentType(MediaType.APPLICATION_JSON);
Writer writer = response.getWriter();
ObjectMapper jsonMapper = new ObjectMapper();
jsonMapper.writeValue(writer, map);
writer.write(ENTER);
writer.flush();
}
requestContinues = false;
}
}
} else {
response.sendError(HttpServletResponse.SC_BAD_REQUEST,
MessageFormat.format(
"Wrong HTTP method [{0}] for operation [{1}], it should be " +
"[{2}]", request.getMethod(), dtOp, dtOp.getHttpMethod()));
requestContinues = false;
}
}
return requestContinues;
}
@SuppressWarnings("unchecked")
private static Map delegationTokenToJSON(Token token) throws IOException {
Map json = new LinkedHashMap();
json.put(
KerberosDelegationTokenAuthenticator.DELEGATION_TOKEN_URL_STRING_JSON,
token.encodeToUrlString());
Map response = new LinkedHashMap();
response.put(KerberosDelegationTokenAuthenticator.DELEGATION_TOKEN_JSON,
json);
return response;
}
/**
* Authenticates a request looking for the <code>delegation</code>
* query-string parameter and verifying it is a valid token. If there is not
* <code>delegation</code> query-string parameter, it delegates the
* authentication to the {@link KerberosAuthenticationHandler} unless it is
* disabled.
*
* @param request the HTTP client request.
* @param response the HTTP client response.
* @return the authentication token for the authenticated request.
* @throws IOException thrown if an IO error occurred.
* @throws AuthenticationException thrown if the authentication failed.
*/
@SuppressWarnings("unchecked")
@Override
public AuthenticationToken authenticate(HttpServletRequest request,
HttpServletResponse response)
throws IOException, AuthenticationException {
AuthenticationToken token;
String delegationParam = getDelegationToken(request);
if (delegationParam != null) {
try {
Token<AbstractDelegationTokenIdentifier> dt = new Token();
dt.decodeFromUrlString(delegationParam);
UserGroupInformation ugi = tokenManager.verifyToken(dt);
final String shortName = ugi.getShortUserName();
// creating a ephemeral token
token = new AuthenticationToken(shortName, ugi.getUserName(),
getType());
token.setExpires(0);
request.setAttribute(DELEGATION_TOKEN_UGI_ATTRIBUTE, ugi);
} catch (Throwable ex) {
token = null;
HttpExceptionUtils.createServletExceptionResponse(response,
HttpServletResponse.SC_FORBIDDEN, new AuthenticationException(ex));
}
} else {
token = authHandler.authenticate(request, response);
}
return token;
}
private String getDelegationToken(HttpServletRequest request)
throws IOException {
String dToken = request.getHeader(
DelegationTokenAuthenticator.DELEGATION_TOKEN_HEADER);
if (dToken == null) {
dToken = ServletUtils.getParameter(request,
KerberosDelegationTokenAuthenticator.DELEGATION_PARAM);
}
return dToken;
}
}