userauth_finish
void userauth_finish(struct ssh *, int, const char *, const char *);
userauth_finish(ssh, authenticated, "keyboard-interactive",
userauth_finish(ssh, 0, "gssapi-with-mic", NULL);
userauth_finish(ssh, authenticated, "gssapi-with-mic", NULL);
userauth_finish(ssh, authenticated, "gssapi-with-mic", NULL);
userauth_finish(ssh, authenticated, method, NULL);