329 lines
14 KiB
Java
329 lines
14 KiB
Java
/**
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*
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* Copyright 2003-2007 Jive Software, 2014-2016 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.sasl;
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import javax.net.ssl.SSLSession;
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import javax.security.auth.callback.CallbackHandler;
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import org.jivesoftware.smack.ConnectionConfiguration;
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import org.jivesoftware.smack.SmackException;
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import org.jivesoftware.smack.SmackException.NotConnectedException;
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import org.jivesoftware.smack.XMPPConnection;
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import org.jivesoftware.smack.sasl.packet.SaslStreamElements.AuthMechanism;
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import org.jivesoftware.smack.sasl.packet.SaslStreamElements.Response;
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import org.jivesoftware.smack.util.StringTransformer;
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import org.jivesoftware.smack.util.StringUtils;
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import org.jivesoftware.smack.util.stringencoder.Base64;
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import org.jxmpp.jid.DomainBareJid;
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import org.jxmpp.jid.EntityBareJid;
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/**
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* Base class for SASL mechanisms.
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* Subclasses will likely want to implement their own versions of these methods:
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* <li>{@link #authenticate(String, String, DomainBareJid, String, EntityBareJid, SSLSession)} -- Initiate authentication stanza using the
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* deprecated method.</li>
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* <li>{@link #authenticate(String, DomainBareJid, CallbackHandler, EntityBareJid, SSLSession)} -- Initiate authentication stanza
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* using the CallbackHandler method.</li>
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* <li>{@link #challengeReceived(String, boolean)} -- Handle a challenge from the server.</li>
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* </ul>
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*
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* @author Jay Kline
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* @author Florian Schmaus
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*/
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public abstract class SASLMechanism implements Comparable<SASLMechanism> {
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public static final String CRAMMD5 = "CRAM-MD5";
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public static final String DIGESTMD5 = "DIGEST-MD5";
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public static final String EXTERNAL = "EXTERNAL";
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public static final String GSSAPI = "GSSAPI";
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public static final String PLAIN = "PLAIN";
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// TODO Remove once Smack's min Android API is 9, where java.text.Normalizer is available
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private static StringTransformer saslPrepTransformer;
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/**
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* Set the SASLPrep StringTransformer.
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* <p>
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* A simple SASLPrep StringTransformer would be for example: <code>java.text.Normalizer.normalize(string, Form.NFKC);</code>
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* </p>
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*
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* @param stringTransformer set StringTransformer to use for SASLPrep.
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* @see <a href="http://tools.ietf.org/html/rfc4013">RFC 4013 - SASLprep: Stringprep Profile for User Names and Passwords</a>
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*/
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public static void setSaslPrepTransformer(StringTransformer stringTransformer) {
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saslPrepTransformer = stringTransformer;
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}
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protected XMPPConnection connection;
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protected ConnectionConfiguration connectionConfiguration;
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/**
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* Then authentication identity (authcid). RFC 6120 § 6.3.7 informs us that some SASL mechanisms use this as a
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* "simple user name". But the exact form is a matter of the mechanism and that it does not necessarily map to an
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* localpart. But it usually is the localpart of the client JID, although sometimes other formats are used (e.g. the
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* full JID).
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* <p>
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* Not to be confused with the authzid (see RFC 6120 § 6.3.8).
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* </p>
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*/
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protected String authenticationId;
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/**
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* The authorization identifier (authzid).
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* This is always a bare Jid, but can be null.
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*/
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protected EntityBareJid authorizationId;
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/**
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* The name of the XMPP service
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*/
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protected DomainBareJid serviceName;
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/**
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* The users password
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*/
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protected String password;
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protected String host;
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/**
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* The used SSL/TLS session (if any).
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*/
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protected SSLSession sslSession;
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/**
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* Builds and sends the <tt>auth</tt> stanza to the server. Note that this method of
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* authentication is not recommended, since it is very inflexible. Use
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* {@link #authenticate(String, DomainBareJid, CallbackHandler, EntityBareJid, SSLSession)} whenever possible.
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*
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* Explanation of auth stanza:
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*
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* The client authentication stanza needs to include the digest-uri of the form: xmpp/serviceName
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* From RFC-2831:
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* digest-uri = "digest-uri" "=" digest-uri-value
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* digest-uri-value = serv-type "/" host [ "/" serv-name ]
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*
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* digest-uri:
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* Indicates the principal name of the service with which the client
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* wishes to connect, formed from the serv-type, host, and serv-name.
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* For example, the FTP service
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* on "ftp.example.com" would have a "digest-uri" value of "ftp/ftp.example.com"; the SMTP
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* server from the example above would have a "digest-uri" value of
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* "smtp/mail3.example.com/example.com".
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*
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* host:
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* The DNS host name or IP address for the service requested. The DNS host name
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* must be the fully-qualified canonical name of the host. The DNS host name is the
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* preferred form; see notes on server processing of the digest-uri.
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*
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* serv-name:
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* Indicates the name of the service if it is replicated. The service is
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* considered to be replicated if the client's service-location process involves resolution
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* using standard DNS lookup operations, and if these operations involve DNS records (such
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* as SRV, or MX) which resolve one DNS name into a set of other DNS names. In this case,
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* the initial name used by the client is the "serv-name", and the final name is the "host"
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* component. For example, the incoming mail service for "example.com" may be replicated
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* through the use of MX records stored in the DNS, one of which points at an SMTP server
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* called "mail3.example.com"; it's "serv-name" would be "example.com", it's "host" would be
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* "mail3.example.com". If the service is not replicated, or the serv-name is identical to
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* the host, then the serv-name component MUST be omitted
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*
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* digest-uri verification is needed for ejabberd 2.0.3 and higher
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*
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* @param username the username of the user being authenticated.
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* @param host the hostname where the user account resides.
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* @param serviceName the xmpp service location - used by the SASL client in digest-uri creation
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* serviceName format is: host [ "/" serv-name ] as per RFC-2831
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* @param password the password for this account.
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* @param authzid the optional authorization identity.
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* @param sslSession the optional SSL/TLS session (if one was established)
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* @throws SmackException If a network error occurs while authenticating.
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* @throws NotConnectedException
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* @throws InterruptedException
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*/
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public final void authenticate(String username, String host, DomainBareJid serviceName, String password,
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EntityBareJid authzid, SSLSession sslSession)
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throws SmackException, NotConnectedException, InterruptedException {
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this.authenticationId = username;
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this.host = host;
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this.serviceName = serviceName;
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this.password = password;
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this.authorizationId = authzid;
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this.sslSession = sslSession;
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assert (authorizationId == null || authzidSupported());
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authenticateInternal();
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authenticate();
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}
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/**
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* @throws SmackException
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*/
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protected void authenticateInternal() throws SmackException {
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}
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/**
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* Builds and sends the <tt>auth</tt> stanza to the server. The callback handler will handle
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* any additional information, such as the authentication ID or realm, if it is needed.
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*
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* @param host the hostname where the user account resides.
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* @param serviceName the xmpp service location
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* @param cbh the CallbackHandler to obtain user information.
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* @param authzid the optional authorization identity.
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* @param sslSession the optional SSL/TLS session (if one was established)
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* @throws SmackException
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* @throws NotConnectedException
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* @throws InterruptedException
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*/
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public void authenticate(String host, DomainBareJid serviceName, CallbackHandler cbh, EntityBareJid authzid, SSLSession sslSession)
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throws SmackException, NotConnectedException, InterruptedException {
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this.host = host;
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this.serviceName = serviceName;
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this.authorizationId = authzid;
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this.sslSession = sslSession;
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assert (authorizationId == null || authzidSupported());
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authenticateInternal(cbh);
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authenticate();
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}
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protected abstract void authenticateInternal(CallbackHandler cbh) throws SmackException;
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private final void authenticate() throws SmackException, NotConnectedException, InterruptedException {
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byte[] authenticationBytes = getAuthenticationText();
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String authenticationText;
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// Some SASL mechanisms do return an empty array (e.g. EXTERNAL from javax), so check that
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// the array is not-empty. Mechanisms are allowed to return either 'null' or an empty array
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// if there is no authentication text.
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if (authenticationBytes != null && authenticationBytes.length > 0) {
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authenticationText = Base64.encodeToString(authenticationBytes);
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} else {
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// RFC6120 6.4.2 "If the initiating entity needs to send a zero-length initial response,
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// it MUST transmit the response as a single equals sign character ("="), which
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// indicates that the response is present but contains no data."
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authenticationText = "=";
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}
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// Send the authentication to the server
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connection.sendNonza(new AuthMechanism(getName(), authenticationText));
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}
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/**
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* Should return the initial response of the SASL mechanism. The returned byte array will be
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* send base64 encoded to the server. SASL mechanism are free to return <code>null</code> or an
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* empty array here.
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*
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* @return the initial response or null
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* @throws SmackException
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*/
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protected abstract byte[] getAuthenticationText() throws SmackException;
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/**
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* The server is challenging the SASL mechanism for the stanza he just sent. Send a
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* response to the server's challenge.
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*
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* @param challengeString a base64 encoded string representing the challenge.
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* @param finalChallenge true if this is the last challenge send by the server within the success stanza
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* @throws NotConnectedException
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* @throws SmackException
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* @throws InterruptedException
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*/
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public final void challengeReceived(String challengeString, boolean finalChallenge) throws SmackException, NotConnectedException, InterruptedException {
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byte[] challenge = Base64.decode((challengeString != null && challengeString.equals("=")) ? "" : challengeString);
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byte[] response = evaluateChallenge(challenge);
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if (finalChallenge) {
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return;
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}
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Response responseStanza;
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if (response == null) {
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responseStanza = new Response();
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}
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else {
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responseStanza = new Response(Base64.encodeToString(response));
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}
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// Send the authentication to the server
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connection.sendNonza(responseStanza);
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}
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/**
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* @throws SmackException
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*/
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protected byte[] evaluateChallenge(byte[] challenge) throws SmackException {
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return null;
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}
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@Override
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public final int compareTo(SASLMechanism other) {
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// Switch to Integer.compare(int, int) once Smack is on Android 19 or higher.
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Integer ourPriority = getPriority();
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return ourPriority.compareTo(other.getPriority());
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}
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/**
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* Returns the common name of the SASL mechanism. E.g.: PLAIN, DIGEST-MD5 or GSSAPI.
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*
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* @return the common name of the SASL mechanism.
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*/
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public abstract String getName();
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/**
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* Get the priority of this SASL mechanism. Lower values mean higher priority.
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*
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* @return the priority of this SASL mechanism.
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*/
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public abstract int getPriority();
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public abstract void checkIfSuccessfulOrThrow() throws SmackException;
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public SASLMechanism instanceForAuthentication(XMPPConnection connection, ConnectionConfiguration connectionConfiguration) {
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SASLMechanism saslMechansim = newInstance();
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saslMechansim.connection = connection;
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saslMechansim.connectionConfiguration = connectionConfiguration;
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return saslMechansim;
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}
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public boolean authzidSupported() {
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return false;
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}
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protected abstract SASLMechanism newInstance();
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protected static byte[] toBytes(String string) {
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return StringUtils.toBytes(string);
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}
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/**
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* SASLprep the given String. The resulting String is in UTF-8.
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*
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* @param string the String to sasl prep.
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* @return the given String SASL preped
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* @see <a href="http://tools.ietf.org/html/rfc4013">RFC 4013 - SASLprep: Stringprep Profile for User Names and Passwords</a>
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*/
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protected static String saslPrep(String string) {
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StringTransformer stringTransformer = saslPrepTransformer;
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if (stringTransformer != null) {
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return stringTransformer.transform(string);
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}
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return string;
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}
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@Override
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public final String toString() {
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return "SASL Mech: " + getName() + ", Prio: " + getPriority();
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}
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}
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