krb5 commit: Don't set ctime in KDC error replies

[Greg Hudson]

https://github.com/krb5/krb5/commit/aff489766e8541bee59d0aa7b9cc7e62f5ca8232
commit aff489766e8541bee59d0aa7b9cc7e62f5ca8232
Author: Greg Hudson <ghudson at mit.edu>
Date:   Tue Aug 29 11:19:36 2017 -0400

    Don't set ctime in KDC error replies
    
    Setting the error ctime field to the client nonce assumes that the
    client used its system time as the nonce, which is not recommended by
    RFC 1510 and is prohibited by RFC 4120.  Omit the field instead, by
    setting the structure field to 0.
    
    ticket: 8610 (new)

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

diff --git a/src/kdc/do_as_req.c b/src/kdc/do_as_req.c
index 8cfb4ef..7c8da63 100644
--- a/src/kdc/do_as_req.c
+++ b/src/kdc/do_as_req.c
@@ -840,7 +840,7 @@ prepare_error_as(struct kdc_request_state *rstate, krb5_kdc_req *request,
         e_data[count] = cookie;
     }
 
-    errpkt.ctime = request->nonce;
+    errpkt.ctime = 0;
     errpkt.cusec = 0;
 
     retval = krb5_us_timeofday(kdc_context, &errpkt.stime, &errpkt.susec);
diff --git a/src/kdc/do_tgs_req.c b/src/kdc/do_tgs_req.c
index b9b1073..cc5a692 100644
--- a/src/kdc/do_tgs_req.c
+++ b/src/kdc/do_tgs_req.c
@@ -896,7 +896,7 @@ prepare_error_tgs (struct kdc_request_state *state,
     kdc_realm_t *kdc_active_realm = state->realm_data;
 
     errpkt.magic = KV5M_ERROR;
-    errpkt.ctime = request->nonce;
+    errpkt.ctime = 0;
     errpkt.cusec = 0;
 
     if ((retval = krb5_us_timeofday(kdc_context, &errpkt.stime,