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package com.sun.mail.smtp;
import java.io.*;
import java.util.*;
import javax.security.sasl.*;
import javax.security.auth.callback.*;
import javax.mail.MessagingException;
import com.sun.mail.util.*;
/**
* This class contains a single method that does authentication using
* SASL. This is in a separate class so that it can be compiled with
* J2SE 1.5. Eventually it should be merged into SMTPTransport.java.
*/
public class SMTPSaslAuthenticator implements SaslAuthenticator {
private SMTPTransport pr;
private String name;
private Properties props;
private boolean debug;
private PrintStream out;
private String host;
public SMTPSaslAuthenticator(SMTPTransport pr, String name,
Properties props, boolean debug, PrintStream out, String host) {
this.pr = pr;
this.name = name;
this.props = props;
this.debug = debug;
this.out = out;
this.host = host;
}
public boolean authenticate(String[] mechs, final String realm,
final String authzid, final String u,
final String p) throws MessagingException {
boolean done = false;
if (debug) {
out.print("DEBUG SMTP SASL: Mechanisms:");
for (int i = 0; i < mechs.length; i++)
out.print(" " + mechs[i]);
out.println();
}
SaslClient sc;
CallbackHandler cbh = new CallbackHandler() {
public void handle(Callback[] callbacks) {
if (debug)
out.println("DEBUG SMTP SASL: callback length: " +
callbacks.length);
for (int i = 0; i < callbacks.length; i++) {
if (debug)
out.println("DEBUG SMTP SASL: callback " + i + ": " +
callbacks[i]);
if (callbacks[i] instanceof NameCallback) {
NameCallback ncb = (NameCallback)callbacks[i];
ncb.setName(u);
} else if (callbacks[i] instanceof PasswordCallback) {
PasswordCallback pcb = (PasswordCallback)callbacks[i];
pcb.setPassword(p.toCharArray());
} else if (callbacks[i] instanceof RealmCallback) {
RealmCallback rcb = (RealmCallback)callbacks[i];
rcb.setText(realm != null ?
realm : rcb.getDefaultText());
} else if (callbacks[i] instanceof RealmChoiceCallback) {
RealmChoiceCallback rcb =
(RealmChoiceCallback)callbacks[i];
if (realm == null)
rcb.setSelectedIndex(rcb.getDefaultChoice());
else {
// need to find specified realm in list
String[] choices = rcb.getChoices();
for (int k = 0; k < choices.length; k++) {
if (choices[k].equals(realm)) {
rcb.setSelectedIndex(k);
break;
}
}
}
}
}
}
};
try {
sc = Sasl.createSaslClient(mechs, authzid, name, host,
(Map)props, cbh);
} catch (SaslException sex) {
if (debug)
out.println("DEBUG SMTP SASL: Failed to create SASL client: " +
sex);
return false;
}
if (sc == null) {
if (debug)
out.println("DEBUG SMTP SASL: No SASL support");
return false;
}
if (debug)
out.println("DEBUG SMTP SASL: SASL client " +
sc.getMechanismName());
int resp;
try {
String mech = sc.getMechanismName();
String ir = null;
if (sc.hasInitialResponse()) {
byte[] ba = sc.evaluateChallenge(new byte[0]);
ba = BASE64EncoderStream.encode(ba);
ir = ASCIIUtility.toString(ba, 0, ba.length);
}
if (ir != null)
resp = pr.simpleCommand("AUTH " + mech + " " + ir);
else
resp = pr.simpleCommand("AUTH " + mech);
/*
* A 530 response indicates that the server wants us to
* issue a STARTTLS command first. Do that and try again.
*/
if (resp == 530) {
pr.startTLS();
if (ir != null)
resp = pr.simpleCommand("AUTH " + mech + " " + ir);
else
resp = pr.simpleCommand("AUTH " + mech);
}
if (resp == 235)
return true; // success already!
if (resp != 334)
return false;
} catch (Exception ex) {
if (debug)
out.println("DEBUG SMTP SASL: AUTHENTICATE Exception: " + ex);
return false;
}
while (!done) { // loop till we are done
try {
if (resp == 334) {
byte[] ba = null;
if (!sc.isComplete()) {
ba = ASCIIUtility.getBytes(responseText(pr));
if (ba.length > 0)
ba = BASE64DecoderStream.decode(ba);
if (debug)
out.println("DEBUG SMTP SASL: challenge: " +
ASCIIUtility.toString(ba, 0, ba.length) + " :");
ba = sc.evaluateChallenge(ba);
}
if (ba == null) {
if (debug)
out.println("DEBUG SMTP SASL: no response");
resp = pr.simpleCommand("*");
} else {
if (debug)
out.println("DEBUG SMTP SASL: response: " +
ASCIIUtility.toString(ba, 0, ba.length) + " :");
ba = BASE64EncoderStream.encode(ba);
resp = pr.simpleCommand(ba);
}
} else
done = true;
} catch (Exception ioex) {
if (debug)
ioex.printStackTrace();
done = true;
// XXX - ultimately return true???
}
}
if (sc.isComplete() /*&& res.status == SUCCESS*/) {
String qop = (String)sc.getNegotiatedProperty(Sasl.QOP);
if (qop != null && (qop.equalsIgnoreCase("auth-int") ||
qop.equalsIgnoreCase("auth-conf"))) {
// XXX - NOT SUPPORTED!!!
if (debug)
out.println("DEBUG SMTP SASL: " +
"Mechanism requires integrity or confidentiality");
return false;
}
}
return true;
}
private static final String responseText(SMTPTransport pr) {
String resp = pr.getLastServerResponse().trim();
if (resp.length() > 4)
return resp.substring(4);
else
return "";
}
}
