Detailed changes
@@ -0,0 +1,72 @@
+package eu.siacs.conversations.crypto.sasl;
+
+import android.util.Base64;
+
+import java.math.BigInteger;
+import java.nio.charset.Charset;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
+
+import eu.siacs.conversations.entities.Account;
+import eu.siacs.conversations.utils.CryptoHelper;
+import eu.siacs.conversations.xml.TagWriter;
+
+public class DigestMd5 extends SaslMechanism {
+ public DigestMd5(final TagWriter tagWriter, final Account account, final SecureRandom rng) {
+ super(tagWriter, account, rng);
+ }
+
+ @Override
+ public String getMechanism() {
+ return "DIGEST-MD5";
+ }
+
+ @Override
+ public String getResponse(final String challenge) {
+ final String encodedResponse;
+ try {
+ final String[] challengeParts = new String(Base64.decode(challenge,
+ Base64.DEFAULT)).split(",");
+ String nonce = "";
+ for (int i = 0; i < challengeParts.length; ++i) {
+ String[] parts = challengeParts[i].split("=");
+ if (parts[0].equals("nonce")) {
+ nonce = parts[1].replace("\"", "");
+ } else if (parts[0].equals("rspauth")) {
+ return "";
+ }
+ }
+ final String digestUri = "xmpp/" + account.getServer();
+ final String nonceCount = "00000001";
+ final String x = account.getUsername() + ":" + account.getServer() + ":"
+ + account.getPassword();
+ final MessageDigest md = MessageDigest.getInstance("MD5");
+ 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()));
+ final String a2 = "AUTHENTICATE:" + digestUri;
+ final String ha1 = CryptoHelper.bytesToHex(md.digest(a1));
+ final String ha2 = CryptoHelper.bytesToHex(md.digest(a2.getBytes(Charset
+ .defaultCharset())));
+ final String kd = ha1 + ":" + nonce + ":" + nonceCount + ":" + cNonce
+ + ":auth:" + ha2;
+ final String response = CryptoHelper.bytesToHex(md.digest(kd.getBytes(Charset
+ .defaultCharset())));
+ final String saslString = "username=\"" + account.getUsername()
+ + "\",realm=\"" + account.getServer() + "\",nonce=\""
+ + nonce + "\",cnonce=\"" + cNonce + "\",nc=" + nonceCount
+ + ",qop=auth,digest-uri=\"" + digestUri + "\",response="
+ + response + ",charset=utf-8";
+ encodedResponse = Base64.encodeToString(
+ saslString.getBytes(Charset.defaultCharset()),
+ Base64.NO_WRAP);
+ } catch (final NoSuchAlgorithmException e) {
+ return "";
+ }
+
+ return encodedResponse;
+ }
+}
@@ -0,0 +1,25 @@
+package eu.siacs.conversations.crypto.sasl;
+
+import android.util.Base64;
+
+import java.nio.charset.Charset;
+
+import eu.siacs.conversations.entities.Account;
+import eu.siacs.conversations.xml.TagWriter;
+
+public class Plain extends SaslMechanism {
+ public Plain(final TagWriter tagWriter, final Account account) {
+ super(tagWriter, account, null);
+ }
+
+ @Override
+ public String getMechanism() {
+ return "PLAIN";
+ }
+
+ @Override
+ public String getStartAuth() {
+ final String sasl = '\u0000' + account.getUsername() + '\u0000' + account.getPassword();
+ return Base64.encodeToString(sasl.getBytes(Charset.defaultCharset()), Base64.NO_WRAP);
+ }
+}
@@ -0,0 +1,27 @@
+package eu.siacs.conversations.crypto.sasl;
+
+import java.security.SecureRandom;
+
+import eu.siacs.conversations.entities.Account;
+import eu.siacs.conversations.xml.TagWriter;
+
+public abstract class SaslMechanism {
+
+ final protected TagWriter tagWriter;
+ final protected Account account;
+ final protected SecureRandom rng;
+
+ public SaslMechanism(final TagWriter tagWriter, final Account account, final SecureRandom rng) {
+ this.tagWriter = tagWriter;
+ this.account = account;
+ this.rng = rng;
+ }
+
+ public abstract String getMechanism();
+ public String getStartAuth() {
+ return "";
+ }
+ public String getResponse(final String challenge) {
+ return "";
+ }
+}
@@ -1,14 +1,7 @@
package eu.siacs.conversations.utils;
-import java.math.BigInteger;
-import java.nio.charset.Charset;
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
-import eu.siacs.conversations.entities.Account;
-import android.util.Base64;
-
public class CryptoHelper {
public static final String FILETRANSFER = "?FILETRANSFERv1:";
final protected static char[] hexArray = "0123456789abcdef".toCharArray();
@@ -36,64 +29,13 @@ public class CryptoHelper {
return array;
}
- public static String saslPlain(String username, String password) {
- String sasl = '\u0000' + username + '\u0000' + password;
- return Base64.encodeToString(sasl.getBytes(Charset.defaultCharset()),
- Base64.NO_WRAP);
- }
-
- private static byte[] concatenateByteArrays(byte[] a, byte[] b) {
+ public static byte[] concatenateByteArrays(byte[] a, byte[] b) {
byte[] result = new byte[a.length + b.length];
System.arraycopy(a, 0, result, 0, a.length);
System.arraycopy(b, 0, result, a.length, b.length);
return result;
}
- public static String saslDigestMd5(Account account, String challenge,
- SecureRandom random) {
- try {
- String[] challengeParts = new String(Base64.decode(challenge,
- Base64.DEFAULT)).split(",");
- String nonce = "";
- for (int i = 0; i < challengeParts.length; ++i) {
- String[] parts = challengeParts[i].split("=");
- if (parts[0].equals("nonce")) {
- nonce = parts[1].replace("\"", "");
- } else if (parts[0].equals("rspauth")) {
- return null;
- }
- }
- String digestUri = "xmpp/" + account.getServer();
- String nonceCount = "00000001";
- String x = account.getUsername() + ":" + account.getServer() + ":"
- + account.getPassword();
- MessageDigest md = MessageDigest.getInstance("MD5");
- byte[] y = md.digest(x.getBytes(Charset.defaultCharset()));
- String cNonce = new BigInteger(100, random).toString(32);
- byte[] a1 = concatenateByteArrays(y,
- (":" + nonce + ":" + cNonce).getBytes(Charset
- .defaultCharset()));
- String a2 = "AUTHENTICATE:" + digestUri;
- String ha1 = bytesToHex(md.digest(a1));
- String ha2 = bytesToHex(md.digest(a2.getBytes(Charset
- .defaultCharset())));
- String kd = ha1 + ":" + nonce + ":" + nonceCount + ":" + cNonce
- + ":auth:" + ha2;
- String response = bytesToHex(md.digest(kd.getBytes(Charset
- .defaultCharset())));
- String saslString = "username=\"" + account.getUsername()
- + "\",realm=\"" + account.getServer() + "\",nonce=\""
- + nonce + "\",cnonce=\"" + cNonce + "\",nc=" + nonceCount
- + ",qop=auth,digest-uri=\"" + digestUri + "\",response="
- + response + ",charset=utf-8";
- return Base64.encodeToString(
- saslString.getBytes(Charset.defaultCharset()),
- Base64.NO_WRAP);
- } catch (NoSuchAlgorithmException e) {
- return null;
- }
- }
-
public static String randomMucName(SecureRandom random) {
return randomWord(3, random) + "." + randomWord(7, random);
}
@@ -39,9 +39,11 @@ import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.X509TrustManager;
import eu.siacs.conversations.Config;
+import eu.siacs.conversations.crypto.sasl.DigestMd5;
+import eu.siacs.conversations.crypto.sasl.Plain;
+import eu.siacs.conversations.crypto.sasl.SaslMechanism;
import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.services.XmppConnectionService;
-import eu.siacs.conversations.utils.CryptoHelper;
import eu.siacs.conversations.utils.DNSHelper;
import eu.siacs.conversations.utils.zlib.ZLibInputStream;
import eu.siacs.conversations.utils.zlib.ZLibOutputStream;
@@ -104,6 +106,8 @@ public class XmppConnection implements Runnable {
private OnMessageAcknowledged acknowledgedListener = null;
private XmppConnectionService mXmppConnectionService = null;
+ private SaslMechanism saslMechanism;
+
public XmppConnection(Account account, XmppConnectionService service) {
this.account = account;
this.wakeLock = service.getPowerManager().newWakeLock(
@@ -287,12 +291,11 @@ public class XmppConnection implements Runnable {
tagReader.readElement(nextTag);
changeStatus(Account.STATUS_UNAUTHORIZED);
} else if (nextTag.isStart("challenge")) {
- String challange = tagReader.readElement(nextTag).getContent();
- Element response = new Element("response");
+ final String challenge = tagReader.readElement(nextTag).getContent();
+ final Element response = new Element("response");
response.setAttribute("xmlns",
"urn:ietf:params:xml:ns:xmpp-sasl");
- response.setContent(CryptoHelper.saslDigestMd5(account,
- challange, mXmppConnectionService.getRNG()));
+ response.setContent(saslMechanism.getResponse(challenge));
tagWriter.writeElement(response);
} else if (nextTag.isStart("enabled")) {
Element enabled = tagReader.readElement(nextTag);
@@ -592,23 +595,6 @@ public class XmppConnection implements Runnable {
}
}
- private void sendSaslAuthPlain() throws IOException {
- String saslString = CryptoHelper.saslPlain(account.getUsername(),
- account.getPassword());
- Element auth = new Element("auth");
- auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
- auth.setAttribute("mechanism", "PLAIN");
- auth.setContent(saslString);
- tagWriter.writeElement(auth);
- }
-
- private void sendSaslAuthDigestMd5() throws IOException {
- Element auth = new Element("auth");
- auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
- auth.setAttribute("mechanism", "DIGEST-MD5");
- tagWriter.writeElement(auth);
- }
-
private void processStreamFeatures(Tag currentTag)
throws XmlPullParserException, IOException {
this.streamFeatures = tagReader.readElement(currentTag);
@@ -626,14 +612,19 @@ public class XmppConnection implements Runnable {
disconnect(true);
} else if (this.streamFeatures.hasChild("mechanisms")
&& shouldAuthenticate && usingEncryption) {
- List<String> mechanisms = extractMechanisms(streamFeatures
+ final List<String> mechanisms = extractMechanisms(streamFeatures
.findChild("mechanisms"));
- if (mechanisms.contains("PLAIN")) {
- sendSaslAuthPlain();
- } else if (mechanisms.contains("DIGEST-MD5")) {
- sendSaslAuthDigestMd5();
- }
- } else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:"
+ final Element auth = new Element("auth");
+ auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
+ if (mechanisms.contains("DIGEST-MD5")) {
+ saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
+ } else if (mechanisms.contains("PLAIN")) {
+ saslMechanism = new Plain(tagWriter, account);
+ auth.setContent(((Plain)saslMechanism).getStartAuth());
+ }
+ auth.setAttribute("mechanism", saslMechanism.getMechanism());
+ tagWriter.writeElement(auth);
+ } else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:"
+ smVersion)
&& streamId != null) {
ResumePacket resume = new ResumePacket(this.streamId,