auth: Do not import empty certificate username

diff --git a/src/auth/auth-request.c b/src/auth/auth-request.c
index d383ba424ae60dd7f34b7adb1153b837de179c1d..578f59ba74c28d3b0211594245541c0a100ddda9 100644 (file)
--- a/src/auth/auth-request.c
+++ b/src/auth/auth-request.c
@@ -453,7 +453,7 @@ bool auth_request_import_auth(struct auth_request *request,
        else if (strcmp(key, "valid-client-cert") == 0)
                request->valid_client_cert = TRUE;
        else if (strcmp(key, "cert_username") == 0) {
-               if (request->set->ssl_username_from_cert) {
+               if (request->set->ssl_username_from_cert && *value != '\0') {
                        /* get username from SSL certificate. it overrides
                           the username given by the auth mechanism. */
                        request->user = p_strdup(request->pool, value);