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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* Licensed to the Apache Software Foundation (ASF) under one
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* to you under the Apache License, Version 2.0 (the
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*
* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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package org.apache.cassandra.cql3.statements;
import org.apache.cassandra.auth.*;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.cql3.RoleName;
import org.apache.cassandra.exceptions.*;
import org.apache.cassandra.service.ClientState;
import org.apache.cassandra.transport.messages.ResultMessage;
public class DropRoleStatement extends AuthenticationStatement
{
private final RoleResource role;
private final boolean ifExists;
public DropRoleStatement(RoleName name, boolean ifExists)
{
this.role = RoleResource.role(name.getName());
this.ifExists = ifExists;
}
public void checkAccess(ClientState state) throws UnauthorizedException
{
super.checkPermission(state, Permission.DROP, role);
// We only check superuser status for existing roles to avoid
// caching info about roles which don't exist (CASSANDRA-9189)
if (DatabaseDescriptor.getRoleManager().isExistingRole(role)
&& Roles.hasSuperuserStatus(role)
&& !state.getUser().isSuper())
throw new UnauthorizedException("Only superusers can drop a role with superuser status");
}
public void validate(ClientState state) throws RequestValidationException
{
// validate login here before checkAccess to avoid leaking user existence to anonymous users.
state.ensureNotAnonymous();
if (!ifExists && !DatabaseDescriptor.getRoleManager().isExistingRole(role))
throw new InvalidRequestException(String.format("%s doesn't exist", role.getRoleName()));
AuthenticatedUser user = state.getUser();
if (user != null && user.getName().equals(role.getRoleName()))
throw new InvalidRequestException("Cannot DROP primary role for current login");
}
public ResultMessage execute(ClientState state) throws RequestValidationException, RequestExecutionException
{
// not rejected in validate()
if (ifExists && !DatabaseDescriptor.getRoleManager().isExistingRole(role))
return null;
// clean up grants and permissions of/on the dropped role.
DatabaseDescriptor.getRoleManager().dropRole(state.getUser(), role);
DatabaseDescriptor.getAuthorizer().revokeAllFrom(role);
DatabaseDescriptor.getAuthorizer().revokeAllOn(role);
return null;
}
}