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Improve auth error handling and state machine

This commit is contained in:
Sam Whited 2014-11-15 08:48:40 -05:00
parent 0e550789d3
commit 4b5d6f5b4f
5 changed files with 43 additions and 40 deletions
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11
src/main/java/eu/siacs/conversations/crypto/sasl/AuthenticationException.java
View File

@ -1,11 +0,0 @@
package eu.siacs.conversations.crypto.sasl;
public class AuthenticationException extends Exception {
public AuthenticationException(final String message) {
super(message);
}
public AuthenticationException(final Exception inner) {
super(inner);
}
}

17
src/main/java/eu/siacs/conversations/crypto/sasl/DigestMd5.java
View File

@ -21,11 +21,6 @@ public class DigestMd5 extends SaslMechanism {
return "DIGEST-MD5";
}
private enum State {
INITIAL,
RESPONSE_SENT,
}
private State state = State.INITIAL;
@Override
@ -53,8 +48,7 @@ public class DigestMd5 extends SaslMechanism {
final byte[] y = md.digest(x.getBytes(Charset.defaultCharset()));
final String cNonce = new BigInteger(100, rng).toString(32);
final byte[] a1 = CryptoHelper.concatenateByteArrays(y,
(":" + nonce + ":" + cNonce).getBytes(Charset
.defaultCharset()));
(":" + nonce + ":" + cNonce).getBytes(Charset.defaultCharset()));
final String a2 = "AUTHENTICATE:" + digestUri;
final String ha1 = CryptoHelper.bytesToHex(md.digest(a1));
final String ha2 = CryptoHelper.bytesToHex(md.digest(a2.getBytes(Charset
@ -72,13 +66,16 @@ public class DigestMd5 extends SaslMechanism {
saslString.getBytes(Charset.defaultCharset()),
Base64.NO_WRAP);
} catch (final NoSuchAlgorithmException e) {
return "";
throw new AuthenticationException(e);
}
return encodedResponse;
case RESPONSE_SENT:
return "";
state = State.VALID_SERVER_RESPONSE;
break;
default:
throw new InvalidStateException(state);
}
return "";
return null;
}
}

27
src/main/java/eu/siacs/conversations/crypto/sasl/SaslMechanism.java
View File

@ -11,6 +11,33 @@ public abstract class SaslMechanism {
final protected Account account;
final protected SecureRandom rng;
protected static enum State {
INITIAL,
AUTH_TEXT_SENT,
RESPONSE_SENT,
VALID_SERVER_RESPONSE,
}
public static class AuthenticationException extends Exception {
public AuthenticationException(final String message) {
super(message);
}
public AuthenticationException(final Exception inner) {
super(inner);
}
}
public static class InvalidStateException extends AuthenticationException {
public InvalidStateException(final String message) {
super(message);
}
public InvalidStateException(final State state) {
this("Invalid state: " + state.toString());
}
}
public SaslMechanism(final TagWriter tagWriter, final Account account, final SecureRandom rng) {
this.tagWriter = tagWriter;
this.account = account;

13
src/main/java/eu/siacs/conversations/crypto/sasl/ScramSha1.java
View File

@ -33,13 +33,6 @@ public class ScramSha1 extends SaslMechanism {
HMAC = new HMac(new SHA1Digest());
}
private enum State {
INITIAL,
AUTH_TEXT_SENT,
RESPONSE_SENT,
VALID_SERVER_RESPONSE,
}
private State state = State.INITIAL;
public ScramSha1(final TagWriter tagWriter, final Account account, final SecureRandom rng) {
@ -56,11 +49,9 @@ public class ScramSha1 extends SaslMechanism {
@Override
public String getClientFirstMessage() {
if (clientFirstMessageBare.isEmpty()) {
if (clientFirstMessageBare.isEmpty() && state == State.INITIAL) {
clientFirstMessageBare = "n=" + CryptoHelper.saslPrep(account.getUsername()) +
",r=" + this.clientNonce;
}
if (state == State.INITIAL) {
state = State.AUTH_TEXT_SENT;
}
return Base64.encodeToString(
@ -157,7 +148,7 @@ public class ScramSha1 extends SaslMechanism {
state = State.VALID_SERVER_RESPONSE;
return "";
default:
throw new AuthenticationException("Invalid state: " + state);
throw new InvalidStateException(state);
}
}

7
src/main/java/eu/siacs/conversations/xmpp/XmppConnection.java
View File

@ -39,7 +39,6 @@ import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.X509TrustManager;
import eu.siacs.conversations.Config;
import eu.siacs.conversations.crypto.sasl.AuthenticationException;
import eu.siacs.conversations.crypto.sasl.DigestMd5;
import eu.siacs.conversations.crypto.sasl.Plain;
import eu.siacs.conversations.crypto.sasl.SaslMechanism;
@ -284,14 +283,14 @@ public class XmppConnection implements Runnable {
} else if (nextTag.isStart("compressed")) {
switchOverToZLib(nextTag);
} else if (nextTag.isStart("success")) {
Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
final String challenge = tagReader.readElement(nextTag).getContent();
try {
saslMechanism.getResponse(challenge);
} catch (final AuthenticationException e) {
} catch (final SaslMechanism.AuthenticationException e) {
disconnect(true);
Log.e(Config.LOGTAG, String.valueOf(e));
}
Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
tagReader.reset();
sendStartStream();
processStream(tagReader.readTag());
@ -306,7 +305,7 @@ public class XmppConnection implements Runnable {
"urn:ietf:params:xml:ns:xmpp-sasl");
try {
response.setContent(saslMechanism.getResponse(challenge));
} catch (final AuthenticationException e) {
} catch (final SaslMechanism.AuthenticationException e) {
// TODO: Send auth abort tag.
Log.e(Config.LOGTAG, e.toString());
}