Smack 4.1.6

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Merge tag '4.1.6'

Smack 4.1.6

smack-sasl-provided/src/main/java/org/jivesoftware/smack/sasl/provided/SASLDigestMD5Mechanism.java

@@ -152,7 +152,7 @@ public class SASLDigestMD5Mechanism extends SASLMechanism {
             } else {
               authzid = ",authzid=\"" + authorizationId + '"';
             }
-            String saslString = "username=\"" + authenticationId + '"'
+            String saslString = "username=\"" + quoteBackslash(authenticationId) + '"'
                                + authzid
                                + ",realm=\"" + serviceName + '"'
                                + ",nonce=\"" + nonce + '"'
@@ -228,4 +228,18 @@ public class SASLDigestMD5Mechanism extends SASLMechanism {
         return responseValue;
     }
 
+    /**
+     * Quote the backslash in the given String. Replaces all occurrences of "\" with "\\".
+     * <p>
+     * According to RFC 2831 § 7.2 a quoted-string consists either of qdtext or quoted-pair. And since quoted-pair is a
+     * backslash followed by a char, every backslash in qdtext must be quoted, since it otherwise would be treated as
+     * qdtext.
+     * </p>
+     *
+     * @param string the input string.
+     * @return the input string where the every backslash is quoted.
+     */
+    public static String quoteBackslash(String string) {
+        return string.replace("\\", "\\\\");
+    }
 }