src/java/org/apache/cassandra/auth/PasswordAuthenticator.java - cassandra - Git at Google

 /*
  * 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.auth;

 import java.net.InetAddress;
 import java.nio.charset.StandardCharsets;
 import java.util.Arrays;
 import java.util.Map;
 import java.util.Set;

 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Lists;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

 import org.apache.cassandra.config.Schema;
 import org.apache.cassandra.cql3.QueryOptions;
 import org.apache.cassandra.cql3.QueryProcessor;
 import org.apache.cassandra.cql3.UntypedResultSet;
 import org.apache.cassandra.cql3.statements.SelectStatement;
 import org.apache.cassandra.exceptions.*;
 import org.apache.cassandra.service.ClientState;
 import org.apache.cassandra.service.QueryState;
 import org.apache.cassandra.transport.messages.ResultMessage;
 import org.apache.cassandra.utils.ByteBufferUtil;
 import org.mindrot.jbcrypt.BCrypt;

 import static org.apache.cassandra.auth.CassandraRoleManager.consistencyForRole;

 /**
  * PasswordAuthenticator is an IAuthenticator implementation
  * that keeps credentials (rolenames and bcrypt-hashed passwords)
  * internally in C* - in system_auth.roles CQL3 table.
  * Since 2.2, the management of roles (creation, modification,
  * querying etc is the responsibility of IRoleManager. Use of
  * PasswordAuthenticator requires the use of CassandraRoleManager
  * for storage and retrieval of encrypted passwords.
  */
 public class PasswordAuthenticator implements IAuthenticator
 {
     private static final Logger logger = LoggerFactory.getLogger(PasswordAuthenticator.class);

     // name of the hash column.
     private static final String SALTED_HASH = "salted_hash";

     // really this is a rolename now, but as it only matters for Thrift, we leave it for backwards compatibility
     public static final String USERNAME_KEY = "username";
     public static final String PASSWORD_KEY = "password";

     static final byte NUL = 0;
     private SelectStatement authenticateStatement;

     public static final String LEGACY_CREDENTIALS_TABLE = "credentials";
     private SelectStatement legacyAuthenticateStatement;

     // No anonymous access.
     public boolean requireAuthentication()
     {
         return true;
     }

     protected static boolean checkpw(String password, String hash)
     {
         try
         {
             return BCrypt.checkpw(password, hash);
         }
         catch (Exception e)
         {
             // Improperly formatted hashes may cause BCrypt.checkpw to throw, so trap any other exception as a failure
             logger.warn("Error: invalid password hash encountered, rejecting user", e);
             return false;
         }
     }

     private AuthenticatedUser authenticate(String username, String password) throws AuthenticationException
     {
         try
         {
             SelectStatement authenticationStatement = authenticationStatement();
             return doAuthenticate(username, password, authenticationStatement);
         }
         catch (RequestExecutionException e)
         {
             logger.trace("Error performing internal authentication", e);
             throw new AuthenticationException("Unable to perform authentication: " + e.getMessage(), e);
         }
     }

     /**
      * If the legacy users table exists try to verify credentials there. This is to handle the case
      * where the cluster is being upgraded and so is running with mixed versions of the authn tables
      */
     private SelectStatement authenticationStatement()
     {
         if (Schema.instance.getCFMetaData(AuthKeyspace.NAME, LEGACY_CREDENTIALS_TABLE) == null)
             return authenticateStatement;
         else
         {
             // If the credentials was initialised only after statement got prepared, re-prepare (CASSANDRA-12813).
             if (legacyAuthenticateStatement == null)
                 prepareLegacyAuthenticateStatement();
             return legacyAuthenticateStatement;
         }
     }

     public Set<DataResource> protectedResources()
     {
         // Also protected by CassandraRoleManager, but the duplication doesn't hurt and is more explicit
         return ImmutableSet.of(DataResource.table(AuthKeyspace.NAME, AuthKeyspace.ROLES));
     }

     public void validateConfiguration() throws ConfigurationException
     {
     }

     public void setup()
     {
         String query = String.format("SELECT %s FROM %s.%s WHERE role = ?",
                                      SALTED_HASH,
                                      AuthKeyspace.NAME,
                                      AuthKeyspace.ROLES);
         authenticateStatement = prepare(query);

         if (Schema.instance.getCFMetaData(AuthKeyspace.NAME, LEGACY_CREDENTIALS_TABLE) != null)
             prepareLegacyAuthenticateStatement();
     }

     private void prepareLegacyAuthenticateStatement()
     {
         String query = String.format("SELECT %s from %s.%s WHERE username = ?",
                                      SALTED_HASH,
                                      AuthKeyspace.NAME,
                                      LEGACY_CREDENTIALS_TABLE);
         legacyAuthenticateStatement = prepare(query);
     }

     public AuthenticatedUser legacyAuthenticate(Map<String, String> credentials) throws AuthenticationException
     {
         String username = credentials.get(USERNAME_KEY);
         if (username == null)
             throw new AuthenticationException(String.format("Required key '%s' is missing", USERNAME_KEY));

         String password = credentials.get(PASSWORD_KEY);
         if (password == null)
             throw new AuthenticationException(String.format("Required key '%s' is missing", PASSWORD_KEY));

         return authenticate(username, password);
     }

     public SaslNegotiator newSaslNegotiator(InetAddress clientAddress)
     {
         return new PlainTextSaslAuthenticator();
     }

     private AuthenticatedUser doAuthenticate(String username, String password, SelectStatement authenticationStatement)
     throws RequestExecutionException, AuthenticationException
     {
         ResultMessage.Rows rows = authenticationStatement.execute(QueryState.forInternalCalls(),
                                                                   QueryOptions.forInternalCalls(consistencyForRole(username),
                                                                                                 Lists.newArrayList(ByteBufferUtil.bytes(username))));
         UntypedResultSet result = UntypedResultSet.create(rows.result);

         if ((result.isEmpty() || !result.one().has(SALTED_HASH)) || !checkpw(password, result.one().getString(SALTED_HASH)))
             throw new AuthenticationException("Username and/or password are incorrect");

         return new AuthenticatedUser(username);
     }

     private SelectStatement prepare(String query)
     {
         return (SelectStatement) QueryProcessor.getStatement(query, ClientState.forInternalCalls()).statement;
     }

     private class PlainTextSaslAuthenticator implements SaslNegotiator
     {
         private boolean complete = false;
         private String username;
         private String password;

         public byte[] evaluateResponse(byte[] clientResponse) throws AuthenticationException
         {
             decodeCredentials(clientResponse);
             complete = true;
             return null;
         }

         public boolean isComplete()
         {
             return complete;
         }

         public AuthenticatedUser getAuthenticatedUser() throws AuthenticationException
         {
             if (!complete)
                 throw new AuthenticationException("SASL negotiation not complete");
             return authenticate(username, password);
         }

         /**
          * SASL PLAIN mechanism specifies that credentials are encoded in a
          * sequence of UTF-8 bytes, delimited by 0 (US-ASCII NUL).
          * The form is : {code}authzId<NUL>authnId<NUL>password<NUL>{code}
          * authzId is optional, and in fact we don't care about it here as we'll
          * set the authzId to match the authnId (that is, there is no concept of
          * a user being authorized to act on behalf of another with this IAuthenticator).
          *
          * @param bytes encoded credentials string sent by the client
          * @return map containing the username/password pairs in the form an IAuthenticator
          * would expect
          * @throws javax.security.sasl.SaslException
          */
         private void decodeCredentials(byte[] bytes) throws AuthenticationException
         {
             logger.trace("Decoding credentials from client token");
             byte[] user = null;
             byte[] pass = null;
             int end = bytes.length;
             for (int i = bytes.length - 1; i >= 0; i--)
             {
                 if (bytes[i] == NUL)
                 {
                     if (pass == null)
                         pass = Arrays.copyOfRange(bytes, i + 1, end);
                     else if (user == null)
                         user = Arrays.copyOfRange(bytes, i + 1, end);
                     else
                         throw new AuthenticationException("Credential format error: username or password is empty or contains NUL(\\0) character");

                     end = i;
                 }
             }

             if (user == null || user.length == 0)
                 throw new AuthenticationException("Authentication ID must not be null");
             if (pass == null || pass.length == 0)
                 throw new AuthenticationException("Password must not be null");

             username = new String(user, StandardCharsets.UTF_8);
             password = new String(pass, StandardCharsets.UTF_8);
         }
     }
 }
	/*
	* 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.auth;

	import java.net.InetAddress;
	import java.nio.charset.StandardCharsets;
	import java.util.Arrays;
	import java.util.Map;
	import java.util.Set;

	import com.google.common.collect.ImmutableSet;
	import com.google.common.collect.Lists;
	import org.slf4j.Logger;
	import org.slf4j.LoggerFactory;

	import org.apache.cassandra.config.Schema;
	import org.apache.cassandra.cql3.QueryOptions;
	import org.apache.cassandra.cql3.QueryProcessor;
	import org.apache.cassandra.cql3.UntypedResultSet;
	import org.apache.cassandra.cql3.statements.SelectStatement;
	import org.apache.cassandra.exceptions.*;
	import org.apache.cassandra.service.ClientState;
	import org.apache.cassandra.service.QueryState;
	import org.apache.cassandra.transport.messages.ResultMessage;
	import org.apache.cassandra.utils.ByteBufferUtil;
	import org.mindrot.jbcrypt.BCrypt;

	import static org.apache.cassandra.auth.CassandraRoleManager.consistencyForRole;

	/**
	* PasswordAuthenticator is an IAuthenticator implementation
	* that keeps credentials (rolenames and bcrypt-hashed passwords)
	* internally in C* - in system_auth.roles CQL3 table.
	* Since 2.2, the management of roles (creation, modification,
	* querying etc is the responsibility of IRoleManager. Use of
	* PasswordAuthenticator requires the use of CassandraRoleManager
	* for storage and retrieval of encrypted passwords.
	*/
	public class PasswordAuthenticator implements IAuthenticator
	{
	private static final Logger logger = LoggerFactory.getLogger(PasswordAuthenticator.class);

	// name of the hash column.
	private static final String SALTED_HASH = "salted_hash";

	// really this is a rolename now, but as it only matters for Thrift, we leave it for backwards compatibility
	public static final String USERNAME_KEY = "username";
	public static final String PASSWORD_KEY = "password";

	static final byte NUL = 0;
	private SelectStatement authenticateStatement;

	public static final String LEGACY_CREDENTIALS_TABLE = "credentials";
	private SelectStatement legacyAuthenticateStatement;

	// No anonymous access.
	public boolean requireAuthentication()
	{
	return true;
	}

	protected static boolean checkpw(String password, String hash)
	{
	try
	{
	return BCrypt.checkpw(password, hash);
	}
	catch (Exception e)
	{
	// Improperly formatted hashes may cause BCrypt.checkpw to throw, so trap any other exception as a failure
	logger.warn("Error: invalid password hash encountered, rejecting user", e);
	return false;
	}
	}

	private AuthenticatedUser authenticate(String username, String password) throws AuthenticationException
	{
	try
	{
	SelectStatement authenticationStatement = authenticationStatement();
	return doAuthenticate(username, password, authenticationStatement);
	}
	catch (RequestExecutionException e)
	{
	logger.trace("Error performing internal authentication", e);
	throw new AuthenticationException("Unable to perform authentication: " + e.getMessage(), e);
	}
	}

	/**
	* If the legacy users table exists try to verify credentials there. This is to handle the case
	* where the cluster is being upgraded and so is running with mixed versions of the authn tables
	*/
	private SelectStatement authenticationStatement()
	{
	if (Schema.instance.getCFMetaData(AuthKeyspace.NAME, LEGACY_CREDENTIALS_TABLE) == null)
	return authenticateStatement;
	else
	{
	// If the credentials was initialised only after statement got prepared, re-prepare (CASSANDRA-12813).
	if (legacyAuthenticateStatement == null)
	prepareLegacyAuthenticateStatement();
	return legacyAuthenticateStatement;
	}
	}

	public Set<DataResource> protectedResources()
	{
	// Also protected by CassandraRoleManager, but the duplication doesn't hurt and is more explicit
	return ImmutableSet.of(DataResource.table(AuthKeyspace.NAME, AuthKeyspace.ROLES));
	}

	public void validateConfiguration() throws ConfigurationException
	{
	}

	public void setup()
	{
	String query = String.format("SELECT %s FROM %s.%s WHERE role = ?",
	SALTED_HASH,
	AuthKeyspace.NAME,
	AuthKeyspace.ROLES);
	authenticateStatement = prepare(query);

	if (Schema.instance.getCFMetaData(AuthKeyspace.NAME, LEGACY_CREDENTIALS_TABLE) != null)
	prepareLegacyAuthenticateStatement();
	}

	private void prepareLegacyAuthenticateStatement()
	{
	String query = String.format("SELECT %s from %s.%s WHERE username = ?",
	SALTED_HASH,
	AuthKeyspace.NAME,
	LEGACY_CREDENTIALS_TABLE);
	legacyAuthenticateStatement = prepare(query);
	}

	public AuthenticatedUser legacyAuthenticate(Map<String, String> credentials) throws AuthenticationException
	{
	String username = credentials.get(USERNAME_KEY);
	if (username == null)
	throw new AuthenticationException(String.format("Required key '%s' is missing", USERNAME_KEY));

	String password = credentials.get(PASSWORD_KEY);
	if (password == null)
	throw new AuthenticationException(String.format("Required key '%s' is missing", PASSWORD_KEY));

	return authenticate(username, password);
	}

	public SaslNegotiator newSaslNegotiator(InetAddress clientAddress)
	{
	return new PlainTextSaslAuthenticator();
	}

	private AuthenticatedUser doAuthenticate(String username, String password, SelectStatement authenticationStatement)
	throws RequestExecutionException, AuthenticationException
	{
	ResultMessage.Rows rows = authenticationStatement.execute(QueryState.forInternalCalls(),
	QueryOptions.forInternalCalls(consistencyForRole(username),
	Lists.newArrayList(ByteBufferUtil.bytes(username))));
	UntypedResultSet result = UntypedResultSet.create(rows.result);

	if ((result.isEmpty() \|\| !result.one().has(SALTED_HASH)) \|\| !checkpw(password, result.one().getString(SALTED_HASH)))
	throw new AuthenticationException("Username and/or password are incorrect");

	return new AuthenticatedUser(username);
	}

	private SelectStatement prepare(String query)
	{
	return (SelectStatement) QueryProcessor.getStatement(query, ClientState.forInternalCalls()).statement;
	}

	private class PlainTextSaslAuthenticator implements SaslNegotiator
	{
	private boolean complete = false;
	private String username;
	private String password;

	public byte[] evaluateResponse(byte[] clientResponse) throws AuthenticationException
	{
	decodeCredentials(clientResponse);
	complete = true;
	return null;
	}

	public boolean isComplete()
	{
	return complete;
	}

	public AuthenticatedUser getAuthenticatedUser() throws AuthenticationException
	{
	if (!complete)
	throw new AuthenticationException("SASL negotiation not complete");
	return authenticate(username, password);
	}

	/**
	* SASL PLAIN mechanism specifies that credentials are encoded in a
	* sequence of UTF-8 bytes, delimited by 0 (US-ASCII NUL).
	* The form is : {code}authzId<NUL>authnId<NUL>password<NUL>{code}
	* authzId is optional, and in fact we don't care about it here as we'll
	* set the authzId to match the authnId (that is, there is no concept of
	* a user being authorized to act on behalf of another with this IAuthenticator).
	*
	* @param bytes encoded credentials string sent by the client
	* @return map containing the username/password pairs in the form an IAuthenticator
	* would expect
	* @throws javax.security.sasl.SaslException
	*/
	private void decodeCredentials(byte[] bytes) throws AuthenticationException
	{
	logger.trace("Decoding credentials from client token");
	byte[] user = null;
	byte[] pass = null;
	int end = bytes.length;
	for (int i = bytes.length - 1; i >= 0; i--)
	{
	if (bytes[i] == NUL)
	{
	if (pass == null)
	pass = Arrays.copyOfRange(bytes, i + 1, end);
	else if (user == null)
	user = Arrays.copyOfRange(bytes, i + 1, end);
	else
	throw new AuthenticationException("Credential format error: username or password is empty or contains NUL(\\0) character");

	end = i;
	}
	}

	if (user == null \|\| user.length == 0)
	throw new AuthenticationException("Authentication ID must not be null");
	if (pass == null \|\| pass.length == 0)
	throw new AuthenticationException("Password must not be null");

	username = new String(user, StandardCharsets.UTF_8);
	password = new String(pass, StandardCharsets.UTF_8);
	}
	}
	}