krb5 commit: Don't send empty etype info from KDC

[Greg Hudson]

https://github.com/krb5/krb5/commit/ef700ee2cc1b33a06cd1e5c6c56ca7cfac8e67c5
commit ef700ee2cc1b33a06cd1e5c6c56ca7cfac8e67c5
Author: Greg Hudson <ghudson at mit.edu>
Date:   Mon Apr 29 14:55:31 2013 -0400

    Don't send empty etype info from KDC
    
    RFC 4120 prohibits empty ETYPE-INFO2 sequences (though not ETYPE-INFO
    sequences), and our client errors out if it sees an empty sequence of
    either.
    
    ticket: 7630

 src/kdc/kdc_preauth.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/src/kdc/kdc_preauth.c b/src/kdc/kdc_preauth.c
index b7f9e15..9c04f70 100644
--- a/src/kdc/kdc_preauth.c
+++ b/src/kdc/kdc_preauth.c
@@ -1420,6 +1420,11 @@ etype_info_helper(krb5_context context, krb5_kdc_req *request,
             seen_des++;
         }
     }
+
+    /* If the list is empty, don't send it at all. */
+    if (i == 0)
+        goto cleanup;
+
     if (etype_info2)
         retval = encode_krb5_etype_info2(entry, &scratch);
     else