Add auth method pinning

1 files changed, 9 insertions, 0 deletions

diff --git a/src/main/java/eu/siacs/conversations/crypto/sasl/SaslMechanism.java b/src/main/java/eu/siacs/conversations/crypto/sasl/SaslMechanism.java
index 7dd5e99c..14d8b944 100644
--- a/src/main/java/eu/siacs/conversations/crypto/sasl/SaslMechanism.java
+++ b/src/main/java/eu/siacs/conversations/crypto/sasl/SaslMechanism.java
@@ -44,6 +44,15 @@ public abstract class SaslMechanism {
 		this.rng = rng;
 	}
 
+	/**
+	 * The priority is used to pin the authentication mechanism. If authentication fails, it MAY be retried with another
+	 * mechanism of the same priority, but MUST NOT be tried with a mechanism of lower priority (to prevent downgrade
+	 * attacks).
+	 * @return An arbitrary int representing the priority
+	 */
+	public abstract int getPriority();
+
+	public abstract String getMechanism();
 	public String getClientFirstMessage() {
 		return "";
 	}