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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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* 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
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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 java.util.Set;
import org.apache.cassandra.auth.Auth;
import org.apache.cassandra.auth.DataResource;
import org.apache.cassandra.auth.IResource;
import org.apache.cassandra.auth.Permission;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.exceptions.RequestValidationException;
import org.apache.cassandra.exceptions.UnauthorizedException;
import org.apache.cassandra.service.ClientState;
public abstract class PermissionAlteringStatement extends AuthorizationStatement
{
protected final Set permissions;
protected DataResource resource;
protected final String username;
protected PermissionAlteringStatement(Set permissions, IResource resource, String username)
{
this.permissions = permissions;
this.resource = (DataResource) resource;
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));
// if a keyspace is omitted when GRANT/REVOKE ON TABLE , we need to correct the resource.
resource = maybeCorrectResource(resource, state);
if (!resource.exists())
throw new InvalidRequestException(String.format("%s doesn't exist", resource));
}
public void checkAccess(ClientState state) throws UnauthorizedException
{
// check that the user has AUTHORIZE permission on the resource or its parents, otherwise reject GRANT/REVOKE.
state.ensureHasPermission(Permission.AUTHORIZE, resource);
// check that the user has [a single permission or all in case of ALL] on the resource or its parents.
for (Permission p : permissions)
state.ensureHasPermission(p, resource);
}
}
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