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<Response> v = new ArrayList<Response>();
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() {
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 {
sc = Sasl.createSaslClient(mechs, authzid, name, host, (Map) props, 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;
}
}
/* 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.
*/
Response[] responses = v.toArray(new Response[v.size()]);
pr.notifyResponseHandlers(responses);
// Handle the final OK, NO, BAD or BYE response
pr.handleResult(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;
}
}
public static void main(String[] args) throws Exception {
if (args.length == 0) {
namesfile = null;
auto = true;
} else {
int i = 0;
if (args[i].equals("-m")) {
i++;
auto = false;
}
if (args.length > i) {
namesfile = args[i++];
if (args.length > i) {
proxyfile = args[i];
}
} else {
namesfile = null;
}
}
CallbackHandler clntCbh = null;
final CallbackHandler srvCbh = new PropertiesFileCallbackHandler(null, namesfile, proxyfile);
Subject clntSubj = doLogin("client");
Subject srvSubj = doLogin("server");
final HashMap clntprops = new HashMap();
final HashMap srvprops = new HashMap();
clntprops.put(Sasl.QOP, "auth");
srvprops.put(Sasl.QOP, "auth,auth-int,auth-conf");
final SaslClient clnt =
(SaslClient)
Subject.doAs(
clntSubj,
new PrivilegedExceptionAction() {
public Object run() throws Exception {
return Sasl.createSaslClient(
new String[] {MECH}, null, PROTOCOL, SERVER_FQDN, clntprops, null);
}
});
if (verbose) {
System.out.println(clntSubj);
System.out.println(srvSubj);
}
final SaslServer srv =
(SaslServer)
Subject.doAs(
srvSubj,
new PrivilegedExceptionAction() {
public Object run() throws Exception {
return Sasl.createSaslServer(MECH, PROTOCOL, SERVER_FQDN, srvprops, srvCbh);
}
});
if (clnt == null) {
throw new IllegalStateException("Unable to find client impl for " + MECH);
}
if (srv == null) {
throw new IllegalStateException("Unable to find server impl for " + MECH);
}
byte[] response;
byte[] challenge;
response =
(byte[])
Subject.doAs(
clntSubj,
new PrivilegedExceptionAction() {
public Object run() throws Exception {
return (clnt.hasInitialResponse() ? clnt.evaluateChallenge(EMPTY) : EMPTY);
}
});
while (!clnt.isComplete() || !srv.isComplete()) {
final byte[] responseCopy = response;
challenge =
(byte[])
Subject.doAs(
srvSubj,
new PrivilegedExceptionAction() {
public Object run() throws Exception {
return srv.evaluateResponse(responseCopy);
}
});
if (challenge != null) {
final byte[] challengeCopy = challenge;
response =
(byte[])
Subject.doAs(
clntSubj,
new PrivilegedExceptionAction() {
public Object run() throws Exception {
return clnt.evaluateChallenge(challengeCopy);
}
});
}
}
if (clnt.isComplete() && srv.isComplete()) {
if (verbose) {
System.out.println("SUCCESS");
System.out.println("authzid is " + srv.getAuthorizationID());
}
} else {
throw new IllegalStateException(
"FAILURE: mismatched state:"
+ " client complete? "
+ clnt.isComplete()
+ " server complete? "
+ srv.isComplete());
}
if (verbose) {
System.out.println(clnt.getNegotiatedProperty(Sasl.QOP));
}
// Now try to use security layer
byte[] clntBuf = new byte[] {0, 1, 2, 3};
try {
byte[] wrapped = clnt.wrap(clntBuf, 0, clntBuf.length);
throw new Exception("clnt wrap should not be allowed w/no security layer");
} catch (IllegalStateException e) {
// expected
}
byte[] srvBuf = new byte[] {10, 11, 12, 13};
try {
byte[] wrapped = srv.wrap(srvBuf, 0, srvBuf.length);
throw new Exception("srv wrap should not be allowed w/no security layer");
} catch (IllegalStateException e) {
// expected
}
try {
byte[] unwrapped = clnt.unwrap(clntBuf, 0, clntBuf.length);
throw new Exception("clnt wrap should not be allowed w/no security layer");
} catch (IllegalStateException e) {
// expected
}
try {
byte[] unwrapped = srv.unwrap(srvBuf, 0, srvBuf.length);
throw new Exception("srv wrap should not be allowed w/no security layer");
} catch (IllegalStateException e) {
// expected
}
}