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/**
* 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 org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.security.SecurityUtil;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.authentication.client.AuthenticatedURL;
import org.apache.hadoop.security.authentication.client.AuthenticationException;
import org.apache.hadoop.security.authentication.client.Authenticator;
import org.apache.hadoop.security.authentication.client.ConnectionConfigurator;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenIdentifier;
import org.apache.hadoop.util.HttpExceptionUtils;
import org.apache.hadoop.util.JsonSerialization;
import org.apache.hadoop.util.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
/**
* {@link Authenticator} wrapper that enhances an {@link Authenticator} with
* Delegation Token support.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public abstract class DelegationTokenAuthenticator implements Authenticator {
private static Logger LOG =
LoggerFactory.getLogger(DelegationTokenAuthenticator.class);
private static final String CONTENT_TYPE = "Content-Type";
private static final String APPLICATION_JSON_MIME = "application/json";
private static final String HTTP_GET = "GET";
private static final String HTTP_PUT = "PUT";
public static final String OP_PARAM = "op";
private static final String OP_PARAM_EQUALS = OP_PARAM + "=";
public static final String DELEGATION_TOKEN_HEADER =
"X-Hadoop-Delegation-Token";
public static final String DELEGATION_PARAM = "delegation";
public static final String TOKEN_PARAM = "token";
public static final String RENEWER_PARAM = "renewer";
public static final String SERVICE_PARAM = "service";
public static final String DELEGATION_TOKEN_JSON = "Token";
public static final String DELEGATION_TOKEN_URL_STRING_JSON = "urlString";
public static final String RENEW_DELEGATION_TOKEN_JSON = "long";
/**
* DelegationToken operations.
*/
@InterfaceAudience.Private
public enum DelegationTokenOperation {
GETDELEGATIONTOKEN(HTTP_GET, true),
RENEWDELEGATIONTOKEN(HTTP_PUT, true),
CANCELDELEGATIONTOKEN(HTTP_PUT, false);
private String httpMethod;
private boolean requiresKerberosCredentials;
private DelegationTokenOperation(String httpMethod,
boolean requiresKerberosCredentials) {
this.httpMethod = httpMethod;
this.requiresKerberosCredentials = requiresKerberosCredentials;
}
public String getHttpMethod() {
return httpMethod;
}
public boolean requiresKerberosCredentials() {
return requiresKerberosCredentials;
}
}
private Authenticator authenticator;
private ConnectionConfigurator connConfigurator;
public DelegationTokenAuthenticator(Authenticator authenticator) {
this.authenticator = authenticator;
}
@Override
public void setConnectionConfigurator(ConnectionConfigurator configurator) {
authenticator.setConnectionConfigurator(configurator);
connConfigurator = configurator;
}
private boolean hasDelegationToken(URL url, AuthenticatedURL.Token token) {
boolean hasDt = false;
if (token instanceof DelegationTokenAuthenticatedURL.Token) {
hasDt = ((DelegationTokenAuthenticatedURL.Token) token).
getDelegationToken() != null;
if (hasDt) {
LOG.trace("Delegation token found: {}",
((DelegationTokenAuthenticatedURL.Token) token)
.getDelegationToken());
}
}
if (!hasDt) {
String queryStr = url.getQuery();
hasDt = (queryStr != null) && queryStr.contains(DELEGATION_PARAM + "=");
LOG.trace("hasDt={}, queryStr={}", hasDt, queryStr);
}
return hasDt;
}
@Override
public void authenticate(URL url, AuthenticatedURL.Token token)
throws IOException, AuthenticationException {
if (!hasDelegationToken(url, token)) {
try {
// check and renew TGT to handle potential expiration
UserGroupInformation.getCurrentUser().checkTGTAndReloginFromKeytab();
LOG.debug("No delegation token found for url={}, "
+ "authenticating with {}", url, authenticator.getClass());
authenticator.authenticate(url, token);
} catch (IOException ex) {
throw NetUtils.wrapException(url.getHost(), url.getPort(),
null, 0, ex);
}
} else {
LOG.debug("Authenticated from delegation token. url={}, token={}",
url, token);
}
}
/**
* Requests a delegation token using the configured Authenticator
* for authentication.
*
* @param url the URL to get the delegation token from. Only HTTP/S URLs are
* supported.
* @param token the authentication token being used for the user where the
* Delegation token will be stored.
* @param renewer the renewer user.
* @throws IOException if an IO error occurred.
* @throws AuthenticationException if an authentication exception occurred.
*/
public Token getDelegationToken(URL url,
AuthenticatedURL.Token token, String renewer)
throws IOException, AuthenticationException {
return getDelegationToken(url, token, renewer, null);
}
/**
* Requests a delegation token using the configured Authenticator
* for authentication.
*
* @param url the URL to get the delegation token from. Only HTTP/S URLs are
* supported.
* @param token the authentication token being used for the user where the
* Delegation token will be stored.
* @param renewer the renewer user.
* @param doAsUser the user to do as, which will be the token owner.
* @throws IOException if an IO error occurred.
* @throws AuthenticationException if an authentication exception occurred.
*/
public Token getDelegationToken(URL url,
AuthenticatedURL.Token token, String renewer, String doAsUser)
throws IOException, AuthenticationException {
Map json = doDelegationTokenOperation(url, token,
DelegationTokenOperation.GETDELEGATIONTOKEN, renewer, null, true,
doAsUser);
json = (Map) json.get(DELEGATION_TOKEN_JSON);
String tokenStr = (String) json.get(DELEGATION_TOKEN_URL_STRING_JSON);
Token dToken =
new Token();
dToken.decodeFromUrlString(tokenStr);
InetSocketAddress service = new InetSocketAddress(url.getHost(),
url.getPort());
SecurityUtil.setTokenService(dToken, service);
return dToken;
}
/**
* Renews a delegation token from the server end-point using the
* configured Authenticator for authentication.
*
* @param url the URL to renew the delegation token from. Only HTTP/S URLs are
* supported.
* @param token the authentication token with the Delegation Token to renew.
* @throws IOException if an IO error occurred.
* @throws AuthenticationException if an authentication exception occurred.
*/
public long renewDelegationToken(URL url,
AuthenticatedURL.Token token,
Token dToken)
throws IOException, AuthenticationException {
return renewDelegationToken(url, token, dToken, null);
}
/**
* Renews a delegation token from the server end-point using the
* configured Authenticator for authentication.
*
* @param url the URL to renew the delegation token from. Only HTTP/S URLs are
* supported.
* @param token the authentication token with the Delegation Token to renew.
* @param doAsUser the user to do as, which will be the token owner.
* @throws IOException if an IO error occurred.
* @throws AuthenticationException if an authentication exception occurred.
*/
public long renewDelegationToken(URL url,
AuthenticatedURL.Token token,
Token dToken, String doAsUser)
throws IOException, AuthenticationException {
Map json = doDelegationTokenOperation(url, token,
DelegationTokenOperation.RENEWDELEGATIONTOKEN, null, dToken, true,
doAsUser);
return (Long) json.get(RENEW_DELEGATION_TOKEN_JSON);
}
/**
* Cancels a delegation token from the server end-point. It does not require
* being authenticated by the configured Authenticator.
*
* @param url the URL to cancel the delegation token from. Only HTTP/S URLs
* are supported.
* @param token the authentication token with the Delegation Token to cancel.
* @throws IOException if an IO error occurred.
*/
public void cancelDelegationToken(URL url,
AuthenticatedURL.Token token,
Token dToken)
throws IOException {
cancelDelegationToken(url, token, dToken, null);
}
/**
* Cancels a delegation token from the server end-point. It does not require
* being authenticated by the configured Authenticator.
*
* @param url the URL to cancel the delegation token from. Only HTTP/S URLs
* are supported.
* @param token the authentication token with the Delegation Token to cancel.
* @param doAsUser the user to do as, which will be the token owner.
* @throws IOException if an IO error occurred.
*/
public void cancelDelegationToken(URL url,
AuthenticatedURL.Token token,
Token dToken, String doAsUser)
throws IOException {
try {
doDelegationTokenOperation(url, token,
DelegationTokenOperation.CANCELDELEGATIONTOKEN, null, dToken, false,
doAsUser);
} catch (AuthenticationException ex) {
throw new IOException("This should not happen: " + ex.getMessage(), ex);
}
}
private Map doDelegationTokenOperation(URL url,
AuthenticatedURL.Token token, DelegationTokenOperation operation,
String renewer, Token dToken, boolean hasResponse, String doAsUser)
throws IOException, AuthenticationException {
Map ret = null;
Map params = new HashMap();
params.put(OP_PARAM, operation.toString());
if (renewer != null) {
params.put(RENEWER_PARAM, renewer);
}
if (dToken != null) {
params.put(TOKEN_PARAM, dToken.encodeToUrlString());
}
// proxyuser
if (doAsUser != null) {
params.put(DelegationTokenAuthenticatedURL.DO_AS, doAsUser);
}
String urlStr = url.toExternalForm();
StringBuilder sb = new StringBuilder(urlStr);
String separator = (urlStr.contains("?")) ? "&" : "?";
for (Map.Entry entry : params.entrySet()) {
sb.append(separator).append(entry.getKey()).append("=").
append(URLEncoder.encode(entry.getValue(), "UTF8"));
separator = "&";
}
url = new URL(sb.toString());
AuthenticatedURL aUrl = new AuthenticatedURL(this, connConfigurator);
org.apache.hadoop.security.token.Token
dt = null;
if (token instanceof DelegationTokenAuthenticatedURL.Token
&& operation.requiresKerberosCredentials()) {
// Unset delegation token to trigger fall-back authentication.
dt = ((DelegationTokenAuthenticatedURL.Token) token).getDelegationToken();
((DelegationTokenAuthenticatedURL.Token) token).setDelegationToken(null);
}
try {
HttpURLConnection conn = aUrl.openConnection(url, token);
conn.setRequestMethod(operation.getHttpMethod());
HttpExceptionUtils.validateResponse(conn, HttpURLConnection.HTTP_OK);
if (hasResponse) {
String contentType = conn.getHeaderField(CONTENT_TYPE);
contentType =
(contentType != null) ? StringUtils.toLowerCase(contentType) : null;
if (contentType != null &&
contentType.contains(APPLICATION_JSON_MIME)) {
try {
ret = JsonSerialization.mapReader().readValue(conn.getInputStream());
} catch (Exception ex) {
throw new AuthenticationException(String.format(
"'%s' did not handle the '%s' delegation token operation: %s",
url.getAuthority(), operation, ex.getMessage()), ex);
}
} else {
throw new AuthenticationException(String.format("'%s' did not " +
"respond with JSON to the '%s' delegation token operation",
url.getAuthority(), operation));
}
}
} finally {
if (dt != null) {
((DelegationTokenAuthenticatedURL.Token) token).setDelegationToken(dt);
}
}
return ret;
}
}
