Use what NSS considers default for DEFAULT cipher string.

Author: Matus Honek <mhonek@redhat.com>
Resolves: #1387868
Backports: #1245279 #1300701

diff --git a/libraries/libldap/tls_m.c b/libraries/libldap/tls_m.c
--- a/libraries/libldap/tls_m.c
+++ b/libraries/libldap/tls_m.c
@@ -645,7 +645,16 @@ nss_parse_ciphers(const char *cipherstr, int cipher_list[ciphernum])
 			}
 		} else if (!strcmp(cipher, "DEFAULT")) {
 			for (i=0; i<ciphernum; i++) {
-				cipher_list[i] = ciphers_def[i].enabled == SSL_ALLOWED ? 1 : 0;
+				PRBool enabled;
+				if (SSL_CipherPrefGetDefault(ciphers_def[i].num, &enabled) == SECSuccess) {
+					if (!(ciphers_def[i].attr & SSL_eNULL)) {
+						cipher_list[i] = enabled == SSL_ALLOWED ? 1 : 0;
+					} else {
+						cipher_list[i] = -1;
+					}
+				} else {
+					cipher_list[i] = -1;
+				}
 			}
 		} else {
 			int mask = 0;