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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.kafka.common.security.oauthbearer.internals;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.Map;
import java.util.Objects;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.UnsupportedCallbackException;
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.errors.SaslAuthenticationException;
import org.apache.kafka.common.security.auth.SaslExtensions;
import org.apache.kafka.common.security.authenticator.SaslInternalConfigs;
import org.apache.kafka.common.security.auth.AuthenticateCallbackHandler;
import org.apache.kafka.common.security.oauthbearer.OAuthBearerExtensionsValidatorCallback;
import org.apache.kafka.common.security.oauthbearer.OAuthBearerLoginModule;
import org.apache.kafka.common.security.oauthbearer.OAuthBearerToken;
import org.apache.kafka.common.security.oauthbearer.OAuthBearerValidatorCallback;
import org.apache.kafka.common.utils.Utils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* {@code SaslServer} implementation for SASL/OAUTHBEARER in Kafka. An instance
* of {@link OAuthBearerToken} is available upon successful authentication via
* the negotiated property "{@code OAUTHBEARER.token}"; the token could be used
* in a custom authorizer (to authorize based on JWT claims rather than ACLs,
* for example).
*/
public class OAuthBearerSaslServer implements SaslServer {
private static final Logger log = LoggerFactory.getLogger(OAuthBearerSaslServer.class);
private static final String NEGOTIATED_PROPERTY_KEY_TOKEN = OAuthBearerLoginModule.OAUTHBEARER_MECHANISM + ".token";
private static final String INTERNAL_ERROR_ON_SERVER = "Authentication could not be performed due to an internal error on the server";
private final AuthenticateCallbackHandler callbackHandler;
private boolean complete;
private OAuthBearerToken tokenForNegotiatedProperty = null;
private String errorMessage = null;
private SaslExtensions extensions;
public OAuthBearerSaslServer(CallbackHandler callbackHandler) {
if (!(Objects.requireNonNull(callbackHandler) instanceof AuthenticateCallbackHandler))
throw new IllegalArgumentException(String.format("Callback handler must be castable to %s: %s",
AuthenticateCallbackHandler.class.getName(), callbackHandler.getClass().getName()));
this.callbackHandler = (AuthenticateCallbackHandler) callbackHandler;
}
/**
* @throws SaslAuthenticationException
* if access token cannot be validated
*
* Note: This method may throw
* {@link SaslAuthenticationException} to provide custom error
* messages to clients. But care should be taken to avoid including
* any information in the exception message that should not be
* leaked to unauthenticated clients. It may be safer to throw
* {@link SaslException} in some cases so that a standard error
* message is returned to clients.
*
*/
@Override
public byte[] evaluateResponse(byte[] response) throws SaslException, SaslAuthenticationException {
if (response.length == 1 && response[0] == OAuthBearerSaslClient.BYTE_CONTROL_A && errorMessage != null) {
log.debug("Received %x01 response from client after it received our error");
throw new SaslAuthenticationException(errorMessage);
}
errorMessage = null;
OAuthBearerClientInitialResponse clientResponse;
try {
clientResponse = new OAuthBearerClientInitialResponse(response);
} catch (SaslException e) {
log.debug(e.getMessage());
throw e;
}
return process(clientResponse.tokenValue(), clientResponse.authorizationId(), clientResponse.extensions());
}
@Override
public String getAuthorizationID() {
if (!complete)
throw new IllegalStateException("Authentication exchange has not completed");
return tokenForNegotiatedProperty.principalName();
}
@Override
public String getMechanismName() {
return OAuthBearerLoginModule.OAUTHBEARER_MECHANISM;
}
@Override
public Object getNegotiatedProperty(String propName) {
if (!complete)
throw new IllegalStateException("Authentication exchange has not completed");
if (NEGOTIATED_PROPERTY_KEY_TOKEN.equals(propName))
return tokenForNegotiatedProperty;
if (SaslInternalConfigs.CREDENTIAL_LIFETIME_MS_SASL_NEGOTIATED_PROPERTY_KEY.equals(propName))
return tokenForNegotiatedProperty.lifetimeMs();
return extensions.map().get(propName);
}
@Override
public boolean isComplete() {
return complete;
}
@Override
public byte[] unwrap(byte[] incoming, int offset, int len) {
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) {
if (!complete)
throw new IllegalStateException("Authentication exchange has not completed");
return Arrays.copyOfRange(outgoing, offset, offset + len);
}
@Override
public void dispose() {
complete = false;
tokenForNegotiatedProperty = null;
extensions = null;
}
private byte[] process(String tokenValue, String authorizationId, SaslExtensions extensions) throws SaslException {
OAuthBearerValidatorCallback callback = new OAuthBearerValidatorCallback(tokenValue);
try {
callbackHandler.handle(new Callback[] {callback});
} catch (IOException | UnsupportedCallbackException e) {
handleCallbackError(e);
}
OAuthBearerToken token = callback.token();
if (token == null) {
errorMessage = jsonErrorResponse(callback.errorStatus(), callback.errorScope(),
callback.errorOpenIDConfiguration());
log.debug(errorMessage);
return errorMessage.getBytes(StandardCharsets.UTF_8);
}
/*
* We support the client specifying an authorization ID as per the SASL
* specification, but it must match the principal name if it is specified.
*/
if (!authorizationId.isEmpty() && !authorizationId.equals(token.principalName()))
throw new SaslAuthenticationException(String.format(
"Authentication failed: Client requested an authorization id (%s) that is different from the token's principal name (%s)",
authorizationId, token.principalName()));
Map validExtensions = processExtensions(token, extensions);
tokenForNegotiatedProperty = token;
this.extensions = new SaslExtensions(validExtensions);
complete = true;
log.debug("Successfully authenticate User={}", token.principalName());
return new byte[0];
}
private Map processExtensions(OAuthBearerToken token, SaslExtensions extensions) throws SaslException {
OAuthBearerExtensionsValidatorCallback extensionsCallback = new OAuthBearerExtensionsValidatorCallback(token, extensions);
try {
callbackHandler.handle(new Callback[] {extensionsCallback});
} catch (UnsupportedCallbackException e) {
// backwards compatibility - no extensions will be added
} catch (IOException e) {
handleCallbackError(e);
}
if (!extensionsCallback.invalidExtensions().isEmpty()) {
String errorMessage = String.format("Authentication failed: %d extensions are invalid! They are: %s",
extensionsCallback.invalidExtensions().size(),
Utils.mkString(extensionsCallback.invalidExtensions(), "", "", ": ", "; "));
log.debug(errorMessage);
throw new SaslAuthenticationException(errorMessage);
}
return extensionsCallback.validatedExtensions();
}
private static String jsonErrorResponse(String errorStatus, String errorScope, String errorOpenIDConfiguration) {
String jsonErrorResponse = String.format("{\"status\":\"%s\"", errorStatus);
if (errorScope != null)
jsonErrorResponse = String.format("%s, \"scope\":\"%s\"", jsonErrorResponse, errorScope);
if (errorOpenIDConfiguration != null)
jsonErrorResponse = String.format("%s, \"openid-configuration\":\"%s\"", jsonErrorResponse,
errorOpenIDConfiguration);
jsonErrorResponse = String.format("%s}", jsonErrorResponse);
return jsonErrorResponse;
}
private void handleCallbackError(Exception e) throws SaslException {
String msg = String.format("%s: %s", INTERNAL_ERROR_ON_SERVER, e.getMessage());
log.debug(msg, e);
throw new SaslException(msg);
}
public static String[] mechanismNamesCompatibleWithPolicy(Map props) {
return props != null && "true".equals(String.valueOf(props.get(Sasl.POLICY_NOPLAINTEXT))) ? new String[] {}
: new String[] {OAuthBearerLoginModule.OAUTHBEARER_MECHANISM};
}
public static class OAuthBearerSaslServerFactory implements SaslServerFactory {
@Override
public SaslServer createSaslServer(String mechanism, String protocol, String serverName, Map props,
CallbackHandler callbackHandler) {
String[] mechanismNamesCompatibleWithPolicy = getMechanismNames(props);
for (String name : mechanismNamesCompatibleWithPolicy) {
if (name.equals(mechanism)) {
return new OAuthBearerSaslServer(callbackHandler);
}
}
return null;
}
@Override
public String[] getMechanismNames(Map props) {
return OAuthBearerSaslServer.mechanismNamesCompatibleWithPolicy(props);
}
}
}