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package com.sun.mail.imap.protocol;
import java.io.*;
import java.util.*;
import java.util.logging.Level;
import javax.security.sasl.*;
import javax.security.auth.callback.*;
import com.sun.mail.iap.*;
import com.sun.mail.imap.*;
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 IMAPProtocol.java.
*/
public class IMAPSaslAuthenticator implements SaslAuthenticator {
private IMAPProtocol pr;
private String name;
private Properties props;
private MailLogger logger;
private String host;
/*
* This is a hack to initialize the OAUTH SASL provider just before,
* and only if, we might need it. This avoids the need for the user
* to initialize it explicitly, or manually configure the security
* providers file.
*/
static {
try {
com.sun.mail.auth.OAuth2SaslClientFactory.init();
} catch (Throwable t) { }
}
public IMAPSaslAuthenticator(IMAPProtocol pr, String name, Properties props,
MailLogger logger, String host) {
this.pr = pr;
this.name = name;
this.props = props;
this.logger = logger;
this.host = host;
}
@Override
public boolean authenticate(String[] mechs, final String realm,
final String authzid, final String u,
final String p) throws ProtocolException {
synchronized (pr) { // authenticate method should be synchronized
List v = new ArrayList<>();
String tag = null;
Response r = null;
boolean done = false;
if (logger.isLoggable(Level.FINE)) {
logger.fine("SASL Mechanisms:");
for (int i = 0; i < mechs.length; i++)
logger.fine(" " + mechs[i]);
logger.fine("");
}
SaslClient sc;
CallbackHandler cbh = new CallbackHandler() {
@Override
public void handle(Callback[] callbacks) {
if (logger.isLoggable(Level.FINE))
logger.fine("SASL callback length: " + callbacks.length);
for (int i = 0; i < callbacks.length; i++) {
if (logger.isLoggable(Level.FINE))
logger.fine("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 {
@SuppressWarnings("unchecked")
Map propsMap = (Map) props;
sc = Sasl.createSaslClient(mechs, authzid, name, host,
propsMap, cbh);
} catch (SaslException sex) {
logger.log(Level.FINE, "Failed to create SASL client", sex);
throw new UnsupportedOperationException(sex.getMessage(), sex);
}
if (sc == null) {
logger.fine("No SASL support");
throw new UnsupportedOperationException("No SASL support");
}
if (logger.isLoggable(Level.FINE))
logger.fine("SASL client " + sc.getMechanismName());
try {
Argument args = new Argument();
args.writeAtom(sc.getMechanismName());
if (pr.hasCapability("SASL-IR") && sc.hasInitialResponse()) {
String irs;
byte[] ba = sc.evaluateChallenge(new byte[0]);
if (ba.length > 0) {
ba = BASE64EncoderStream.encode(ba);
irs = ASCIIUtility.toString(ba, 0, ba.length);
} else
irs = "=";
args.writeAtom(irs);
}
tag = pr.writeCommand("AUTHENTICATE", args);
} catch (Exception ex) {
logger.log(Level.FINE, "SASL AUTHENTICATE Exception", ex);
return false;
}
OutputStream os = pr.getIMAPOutputStream(); // stream to IMAP server
/*
* Wrap a BASE64Encoder around a ByteArrayOutputstream
* to craft b64 encoded username and password strings
*
* Note that the encoded bytes should be sent "as-is" to the
* server, *not* as literals or quoted-strings.
*
* Also note that unlike the B64 definition in MIME, CRLFs
* should *not* be inserted during the encoding process. So, I
* use Integer.MAX_VALUE (0x7fffffff (> 1G)) as the bytesPerLine,
* which should be sufficiently large !
*/
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] CRLF = { (byte)'\r', (byte)'\n'};
// Hack for Novell GroupWise XGWTRUSTEDAPP authentication mechanism
// http://www.novell.com/developer/documentation/gwimap/?
// page=/developer/documentation/gwimap/gwimpenu/data/al7te9j.html
boolean isXGWTRUSTEDAPP =
sc.getMechanismName().equals("XGWTRUSTEDAPP") &&
PropUtil.getBooleanProperty(props,
"mail." + name + ".sasl.xgwtrustedapphack.enable", true);
while (!done) { // loop till we are done
try {
r = pr.readResponse();
if (r.isContinuation()) {
byte[] ba = null;
if (!sc.isComplete()) {
ba = r.readByteArray().getNewBytes();
if (ba.length > 0)
ba = BASE64DecoderStream.decode(ba);
if (logger.isLoggable(Level.FINE))
logger.fine("SASL challenge: " +
ASCIIUtility.toString(ba, 0, ba.length) + " :");
ba = sc.evaluateChallenge(ba);
}
if (ba == null) {
logger.fine("SASL no response");
os.write(CRLF); // write out empty line
os.flush(); // flush the stream
bos.reset(); // reset buffer
} else {
if (logger.isLoggable(Level.FINE))
logger.fine("SASL response: " +
ASCIIUtility.toString(ba, 0, ba.length) + " :");
ba = BASE64EncoderStream.encode(ba);
if (isXGWTRUSTEDAPP)
bos.write(ASCIIUtility.getBytes("XGWTRUSTEDAPP "));
bos.write(ba);
bos.write(CRLF); // CRLF termination
os.write(bos.toByteArray()); // write out line
os.flush(); // flush the stream
bos.reset(); // reset buffer
}
} else if (r.isTagged() && r.getTag().equals(tag))
// Ah, our tagged response
done = true;
else if (r.isBYE()) // outta here
done = true;
else // hmm .. unsolicited response here ?!
v.add(r);
} catch (Exception ioex) {
logger.log(Level.FINE, "SASL Exception", ioex);
// convert this into a BYE response
r = Response.byeResponse(ioex);
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!!!
logger.fine(
"SASL Mechanism requires integrity or confidentiality");
return false;
}
}
Response[] responses = v.toArray(new Response[v.size()]);
// handle an illegal but not uncommon untagged CAPABILTY response
pr.handleCapabilityResponse(responses);
/*
* Dispatch untagged responses.
* NOTE: in our current upper level IMAP classes, we add the
* responseHandler to the Protocol object only *after* the
* connection has been authenticated. So, for now, the below
* code really ends up being just a no-op.
*/
pr.notifyResponseHandlers(responses);
// Handle the final OK, NO, BAD or BYE response
pr.handleLoginResult(r);
pr.setCapabilities(r);
/*
* If we're using the Novell Groupwise XGWTRUSTEDAPP mechanism
* to run as a specified authorization ID, we have to issue a
* LOGIN command to select the user we want to operate as.
*/
if (isXGWTRUSTEDAPP && authzid != null) {
Argument args = new Argument();
args.writeString(authzid);
responses = pr.command("LOGIN", args);
// dispatch untagged responses
pr.notifyResponseHandlers(responses);
// Handle result of this command
pr.handleResult(responses[responses.length-1]);
// If the response includes a CAPABILITY response code, process it
pr.setCapabilities(responses[responses.length-1]);
}
return true;
}
}
}
