232 lines
9.4 KiB
Java
232 lines
9.4 KiB
Java
/**
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*
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* Copyright 2003-2007 Jive Software, 2014 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 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.SaslStanzas.AuthMechanism;
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import org.jivesoftware.smack.sasl.packet.SaslStanzas.Response;
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import org.jivesoftware.smack.util.StringUtils;
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import javax.security.auth.callback.CallbackHandler;
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/**
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* Base class for SASL mechanisms. Subclasses must implement these methods:
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* <ul>
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* <li>{@link #getName()} -- returns the common name of the SASL mechanism.</li>
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* </ul>
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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, String, String)} -- Initiate authentication stanza using the
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* deprecated method.</li>
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* <li>{@link #authenticate(String, String, CallbackHandler)} -- 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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* Basic XMPP SASL authentication steps:
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* 1. Client authentication initialization, stanza sent to the server (Base64 encoded):
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* <auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl' mechanism='DIGEST-MD5'/>
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* 2. Server sends back to the client the challenge response (Base64 encoded)
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* sample:
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* realm=<sasl server realm>,nonce="OA6MG9tEQGm2hh",qop="auth",charset=utf-8,algorithm=md5-sess
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* 3. The client responds back to the server (Base 64 encoded):
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* sample:
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* username=<userid>,realm=<sasl server realm from above>,nonce="OA6MG9tEQGm2hh",
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* cnonce="OA6MHXh6VqTrRk",nc=00000001,qop=auth,
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* digest-uri=<digesturi>,
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* response=d388dad90d4bbd760a152321f2143af7,
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* charset=utf-8,
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* authzid=<id>
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* 4. The server evaluates if the user is present and contained in the REALM
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* if successful it sends: <response xmlns='urn:ietf:params:xml:ns:xmpp-sasl'/> (Base64 encoded)
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* if not successful it sends:
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* sample:
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* <challenge xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>
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* cnNwYXV0aD1lYTQwZjYwMzM1YzQyN2I1NTI3Yjg0ZGJhYmNkZmZmZA==
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* </challenge>
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*
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* @author Jay Kline
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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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protected XMPPConnection connection;
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/**
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* authcid
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*/
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protected String authenticationId;
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/**
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* The name of the XMPP service
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*/
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protected String 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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* 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, String, CallbackHandler)} 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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* @throws SmackException If a network error occurs while authenticating.
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* @throws NotConnectedException
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*/
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public final void authenticate(String username, String host, String serviceName, String password)
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throws SmackException, NotConnectedException {
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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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authenticateInternal();
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authenticate();
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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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* @throws SmackException
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* @throws NotConnectedException
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*/
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public void authenticate(String host,String serviceName, CallbackHandler cbh)
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throws SmackException, NotConnectedException {
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this.host = host;
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this.serviceName = serviceName;
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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 {
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String authenticationText = getAuthenticationText();
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// Send the authentication to the server
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connection.sendPacket(new AuthMechanism(getName(), authenticationText));
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}
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protected abstract String 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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*/
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public final void challengeReceived(String challengeString, boolean finalChallenge) throws SmackException, NotConnectedException {
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byte[] challenge = StringUtils.decodeBase64(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(StringUtils.encodeBase64(response, false));
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}
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// Send the authentication to the server
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connection.sendPacket(responseStanza);
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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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public final int compareTo(SASLMechanism other) {
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return getPriority() - 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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public abstract int getPriority();
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public SASLMechanism instanceForAuthentication(XMPPConnection connection) {
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SASLMechanism saslMechansim = newInstance();
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saslMechansim.connection = connection;
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return saslMechansim;
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}
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protected abstract SASLMechanism newInstance();
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}
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