package org.apache.cassandra.auth;
/*
*
* 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.
*
*/
import java.io.*;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Properties;
import org.apache.cassandra.thrift.AuthenticationException;
import org.apache.cassandra.thrift.AuthenticationRequest;
import org.apache.cassandra.thrift.AuthorizationException;
public class SimpleAuthenticator implements IAuthenticator
{
public final static String PASSWD_FILENAME_PROPERTY = "passwd.properties";
public final static String ACCESS_FILENAME_PROPERTY = "access.properties";
public final static String PMODE_PROPERTY = "passwd.mode";
public static final String USERNAME_KEY = "username";
public static final String PASSWORD_KEY = "password";
public enum PasswordMode
{
PLAIN, MD5,
};
@Override
public void login(String keyspace, AuthenticationRequest authRequest) throws AuthenticationException, AuthorizationException
{
String pmode_plain = System.getProperty(PMODE_PROPERTY);
PasswordMode mode = PasswordMode.PLAIN;
if (null != pmode_plain)
{
try
{
mode = PasswordMode.valueOf(pmode_plain);
}
catch (Exception e)
{
// this is not worth a StringBuffer
String mode_values = "";
for (PasswordMode pm : PasswordMode.values())
mode_values += "'" + pm + "', ";
mode_values += "or leave it unspecified.";
throw new AuthenticationException("The requested password check mode '" + pmode_plain + "' is not a valid mode. Possible values are " + mode_values);
}
}
String pfilename = System.getProperty(PASSWD_FILENAME_PROPERTY);
String username = authRequest.getCredentials().get(USERNAME_KEY);
if (null == username) throw new AuthenticationException("Authentication request was missing the required key '" + USERNAME_KEY + "'");
String password = authRequest.getCredentials().get(PASSWORD_KEY);
if (null == password) throw new AuthenticationException("Authentication request was missing the required key '" + PASSWORD_KEY + "'");
boolean authenticated = false;
try
{
FileInputStream in = new FileInputStream(pfilename);
Properties props = new Properties();
props.load(in);
in.close();
// note we keep the message here and for the wrong password exactly the same to prevent attackers from guessing what users are valid
if (null == props.getProperty(username)) throw new AuthenticationException(authenticationErrorMessage(mode, username));
switch (mode)
{
case PLAIN:
authenticated = password.equals(props.getProperty(username));
break;
case MD5:
authenticated = MessageDigest.isEqual(password.getBytes(), MessageDigest.getInstance("MD5").digest(props.getProperty(username).getBytes()));
break;
}
}
catch (NoSuchAlgorithmException e)
{
throw new AuthenticationException("You requested MD5 checking but the MD5 digest algorithm is not available: " + e.getMessage());
}
catch (FileNotFoundException e)
{
throw new RuntimeException("Authentication table file given by property " + PASSWD_FILENAME_PROPERTY + " could not be found: " + e.getMessage());
}
catch (IOException e)
{
throw new RuntimeException("Authentication table file given by property " + PASSWD_FILENAME_PROPERTY + " could not be opened: " + e.getMessage());
}
catch (Exception e)
{
throw new RuntimeException("Unexpected authentication problem", e);
}
if (!authenticated) throw new AuthenticationException(authenticationErrorMessage(mode, username));
// if we're here, the authentication succeeded. Now let's see if the user is authorized for this keyspace.
String afilename = System.getProperty(ACCESS_FILENAME_PROPERTY);
boolean authorized = false;
try
{
FileInputStream in = new FileInputStream(afilename);
Properties props = new Properties();
props.load(in);
in.close();
// structure:
// given keyspace X, users A B and C can be authorized like this (separate their names with spaces):
// X = A B C
// note we keep the message here and for other authorization problems exactly the same to prevent attackers from guessing what keyspaces are valid
if (null == props.getProperty(keyspace)) throw new AuthorizationException(authorizationErrorMessage(keyspace, username));
for (String allow : props.getProperty(keyspace).split(","))
{
if (allow.equals(username)) authorized = true;
}
}
catch (FileNotFoundException e)
{
throw new RuntimeException("Authorization table file given by property " + ACCESS_FILENAME_PROPERTY + " could not be found: " + e.getMessage());
}
catch (IOException e)
{
throw new RuntimeException("Authorization table file given by property " + ACCESS_FILENAME_PROPERTY + " could not be opened: " + e.getMessage());
}
catch (Exception e)
{
throw new RuntimeException("Unexpected authorization problem", e);
}
if (!authorized) throw new AuthorizationException(authorizationErrorMessage(keyspace, username));
}
static String authorizationErrorMessage(String keyspace, String username)
{
return String.format("User %s could not be authorized to use keyspace %s", username, keyspace);
}
static String authenticationErrorMessage(PasswordMode mode, String username)
{
return String.format("Given password in password mode %s could not be validated for user %s", mode, username);
}
}