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/*******************************************************************************
* ============LICENSE_START=======================================================
* org.onap.dmaap
* ================================================================================
* Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*
*
*******************************************************************************/
package org.onap.dmaap.kafkaAuthorize;
import java.io.UnsupportedEncodingException;
import java.util.Arrays;
import java.util.Map;
import javax.security.auth.callback.CallbackHandler;
import javax.security.sasl.Sasl;
import javax.security.sasl.SaslException;
import javax.security.sasl.SaslServer;
import javax.security.sasl.SaslServerFactory;
import org.apache.kafka.common.security.JaasContext;
import org.apache.kafka.common.security.authenticator.SaslServerCallbackHandler;
import org.onap.dmaap.commonauth.kafka.base.authorization.AuthorizationProviderFactory;
/**
* Simple SaslServer implementation for SASL/PLAIN. In order to make this
* implementation fully pluggable, authentication of username/password is fully
* contained within the server implementation.
* <p>
* Valid users with passwords are specified in the Jaas configuration file. Each
* user is specified with user_<username> as key and <password> as value. This
* is consistent with Zookeeper Digest-MD5 implementation.
* <p>
* To avoid storing clear passwords on disk or to integrate with external
* authentication servers in production systems, this module can be replaced
* with a different implementation.
*
*/
public class PlainSaslServer1 implements SaslServer {
public static final String PLAIN_MECHANISM = "PLAIN";
private final JaasContext jaasContext;
private boolean complete;
private String authorizationID;
public PlainSaslServer1(JaasContext jaasContext) {
this.jaasContext = jaasContext;
}
@Override
public byte[] evaluateResponse(byte[] response) throws SaslException {
/*
* Message format (from https://tools.ietf.org/html/rfc4616):
*
* message = [authzid] UTF8NUL authcid UTF8NUL passwd authcid = 1*SAFE ;
* MUST accept up to 255 octets authzid = 1*SAFE ; MUST accept up to 255
* octets passwd = 1*SAFE ; MUST accept up to 255 octets UTF8NUL = %x00
* ; UTF-8 encoded NUL character
*
* SAFE = UTF1 / UTF2 / UTF3 / UTF4 ;; any UTF-8 encoded Unicode
* character except NUL
*/
String[] tokens;
try {
tokens = new String(response, "UTF-8").split("\u0000");
} catch (UnsupportedEncodingException e) {
throw new SaslException("UTF-8 encoding not supported", e);
}
if (tokens.length != 3)
throw new SaslException("Invalid SASL/PLAIN response: expected 3 tokens, got " + tokens.length);
authorizationID = tokens[0];
String username = tokens[1];
String password = tokens[2];
if (username.isEmpty()) {
throw new SaslException("Authentication failed: username not specified");
}
if (password.isEmpty()) {
throw new SaslException("Authentication failed: password not specified");
}
if (authorizationID.isEmpty())
authorizationID = username;
String aafResponse = "Not Verified";
try {
aafResponse = AuthorizationProviderFactory.getProviderFactory().getProvider().authenticate(username,
password);
} catch (Exception e) {
}
if (null != aafResponse) {
throw new SaslException("Authentication failed: " + aafResponse + " User " + username);
}
complete = true;
return new byte[0];
}
@Override
public String getAuthorizationID() {
if (!complete)
throw new IllegalStateException("Authentication exchange has not completed");
return authorizationID;
}
@Override
public String getMechanismName() {
return PLAIN_MECHANISM;
}
@Override
public Object getNegotiatedProperty(String propName) {
if (!complete)
throw new IllegalStateException("Authentication exchange has not completed");
return null;
}
@Override
public boolean isComplete() {
return complete;
}
@Override
public byte[] unwrap(byte[] incoming, int offset, int len) throws SaslException {
if (!complete)
throw new IllegalStateException("Authentication exchange has not completed");
return Arrays.copyOfRange(incoming, offset, offset + len);
}
@Override
public byte[] wrap(byte[] outgoing, int offset, int len) throws SaslException {
if (!complete)
throw new IllegalStateException("Authentication exchange has not completed");
return Arrays.copyOfRange(outgoing, offset, offset + len);
}
@Override
public void dispose() throws SaslException {
}
public static class PlainSaslServerFactory1 implements SaslServerFactory {
@Override
public SaslServer createSaslServer(String mechanism, String protocol, String serverName, Map<String, ?> props,
CallbackHandler cbh) throws SaslException {
if (!PLAIN_MECHANISM.equals(mechanism))
throw new SaslException(
String.format("Mechanism \'%s\' is not supported. Only PLAIN is supported.", mechanism));
if (!(cbh instanceof SaslServerCallbackHandler))
throw new SaslException(
"CallbackHandler must be of type SaslServerCallbackHandler, but it is: " + cbh.getClass());
return new PlainSaslServer1(((SaslServerCallbackHandler) cbh).jaasContext());
}
@Override
public String[] getMechanismNames(Map<String, ?> props) {
if (props == null)
return new String[] { PLAIN_MECHANISM };
String noPlainText = (String) props.get(Sasl.POLICY_NOPLAINTEXT);
if ("true".equals(noPlainText))
return new String[] {};
else
return new String[] { PLAIN_MECHANISM };
}
}
}
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