krb5 commit [krb5-1.13]: Fix KDC client referrals

[Tom Yu]

https://github.com/krb5/krb5/commit/0ab7ca1d886be6223b59dc7948f7500f8872f3da
commit 0ab7ca1d886be6223b59dc7948f7500f8872f3da
Author: Greg Hudson <ghudson at mit.edu>
Date:   Thu Sep 3 12:38:44 2015 -0400

    Fix KDC client referrals
    
    Although our built-in KDB modules do not support client referrals for
    AS requests, the KDC is supposed to return one if a third-party module
    returns a DB entry containing a principal in a foreign realm.
    Unfortunately, this code has never worked; in prepare_error_as(), we
    erroneously compare the protocol code errcode against the com_err code
    KRB5KDC_ERR_WRONG_REALM; as a result, we never supply the canonical
    client principal.  Fix this by comparing errcode against the protocol
    code KDC_ERR_WRONG_REALM instead.
    
    Discovered by Alexander Bokovoy and Simo Sorce.
    
    (cherry picked from commit 4e036ef4127a9b09d1a567472da1df24c55cdb89)
    
    ticket: 8241
    version_fixed: 1.13.3
    status: resolved

 src/kdc/do_as_req.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/kdc/do_as_req.c b/src/kdc/do_as_req.c
index a1db924..2db0d2e 100644
--- a/src/kdc/do_as_req.c
+++ b/src/kdc/do_as_req.c
@@ -795,7 +795,7 @@ prepare_error_as (struct kdc_request_state *rstate, krb5_kdc_req *request,
         return retval;
     errpkt.error = error;
     errpkt.server = request->server;
-    errpkt.client = (error == KRB5KDC_ERR_WRONG_REALM) ? canon_client :
+    errpkt.client = (error == KDC_ERR_WRONG_REALM) ? canon_client :
         request->client;
     errpkt.text = string2data((char *)status);