/*
* 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.cassandra.cql3.statements;
import org.apache.cassandra.auth.Auth;
import org.apache.cassandra.auth.AuthenticatedUser;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.exceptions.RequestExecutionException;
import org.apache.cassandra.exceptions.RequestValidationException;
import org.apache.cassandra.exceptions.UnauthorizedException;
import org.apache.cassandra.service.ClientState;
import org.apache.cassandra.transport.messages.ResultMessage;
public class DropUserStatement extends AuthenticationStatement
{
private final String username;
public DropUserStatement(String username)
{
this.username = username;
}
public void validate(ClientState state) throws RequestValidationException
{
// validate login here before checkAccess to avoid leaking user existence to anonymous users.
state.ensureNotAnonymous();
if (!Auth.isExistingUser(username))
throw new InvalidRequestException(String.format("User %s doesn't exist", username));
AuthenticatedUser user = state.getUser();
if (user != null && user.getName().equals(username))
throw new InvalidRequestException("Users aren't allowed to DROP themselves");
}
public void checkAccess(ClientState state) throws UnauthorizedException
{
if (!state.getUser().isSuper())
throw new UnauthorizedException("Only superusers are allowed to perform DROP USER queries");
}
public ResultMessage execute(ClientState state) throws RequestValidationException, RequestExecutionException
{
// clean up permissions after the dropped user.
DatabaseDescriptor.getAuthorizer().revokeAll(username);
Auth.deleteUser(username);
DatabaseDescriptor.getAuthenticator().drop(username);
return null;
}
}