Bug 703181 - Asked for password which is never used

When the SASL mechanism reports that it can try an "empty password", give
it the opportunity to do so before we demand that the user provide one.

(Patch mostly by mbarnes; thanks)

(cherry picked from commit 046a17ba199e79b44337ac376131a2d566a3e7d8)

1 files changed, 27 insertions, 9 deletions

diff --git a/libemail-engine/e-mail-session.c b/libemail-engine/e-mail-session.c
index db756ee7ea..a517f2a8e2 100644
--- a/libemail-engine/e-mail-session.c
+++ b/libemail-engine/e-mail-session.c
@@ -1505,6 +1505,7 @@ mail_session_authenticate_sync (CamelSession *session,
 	CamelAuthenticationResult result;
 	const gchar *uid;
 	gboolean authenticated;
+	gboolean try_empty_password = FALSE;
 	GError *local_error = NULL;
 
 	/* Do not chain up.  Camel's default method is only an example for
@@ -1541,23 +1542,28 @@ mail_session_authenticate_sync (CamelSession *session,
 		CamelProvider *provider;
 		CamelSasl *sasl;
 		const gchar *service_name;
-		gboolean success = FALSE;
 
 		provider = camel_service_get_provider (service);
 		service_name = provider->protocol;
 
 		/* XXX Would be nice if camel_sasl_try_empty_password_sync()
-		 *     returned CamelAuthenticationResult so it's easier to
-		 *     detect errors. */
+		 *     returned the result in an "out" parameter so it's
+		 *     easier to distinguish errors from a "no" answer.
+		 * YYY There are precisely two states. Either we appear to
+		 *     have credentials (although we don't yet know if the
+		 *     server would *accept* them, of course). Or we don't
+		 *     have any credentials, and we can't even try. There
+		 *     is no middle ground.
+		 *     N.B. For 'have credentials', read 'the ntlm_auth
+		 *          helper exists and at first glance seems to
+		 *          be responding sanely'. */
 		sasl = camel_sasl_new (service_name, mechanism, service);
 		if (sasl != NULL) {
-			success = camel_sasl_try_empty_password_sync (
+			try_empty_password =
+				camel_sasl_try_empty_password_sync (
 				sasl, cancellable, &local_error);
 			g_object_unref (sasl);
 		}
-
-		if (success)
-			return TRUE;
 	}
 
 	/* Abort authentication if we got cancelled.
@@ -1581,9 +1587,21 @@ mail_session_authenticate_sync (CamelSession *session,
 
 	auth = e_mail_authenticator_new (service, mechanism);
 
-	authenticated = e_source_registry_authenticate_sync (
-		registry, source, auth, cancellable, error);
+	result = CAMEL_AUTHENTICATION_REJECTED;
+
+	if (try_empty_password) {
+		result = camel_service_authenticate_sync (
+			service, mechanism, cancellable, error);
+	}
 
+	if (result == CAMEL_AUTHENTICATION_REJECTED) {
+		/* We need a password, preferrably one cached in
+		 * the keyring or else by interactive user prompt. */
+		authenticated = e_source_registry_authenticate_sync (
+			registry, source, auth, cancellable, error);
+	} else {
+		authenticated = (result == CAMEL_AUTHENTICATION_ACCEPTED);
+	}
 	g_object_unref (auth);
 
 	g_object_unref (source);