[29985] in CVS-changelog-for-Kerberos-V5
krb5 commit [krb5-1.14]: Check for FAST in encrypted challenge client
daemon@ATHENA.MIT.EDU (Greg Hudson)
Mon Jul 17 22:41:35 2017
Date: Mon, 17 Jul 2017 22:41:24 -0400
From: Greg Hudson <ghudson@mit.edu>
Message-Id: <201707180241.v6I2fOLu002989@drugstore.mit.edu>
To: cvs-krb5@mit.edu
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https://github.com/krb5/krb5/commit/39a8a84b9bc880ef2879667f93c18b4d1b989eff
commit 39a8a84b9bc880ef2879667f93c18b4d1b989eff
Author: Greg Hudson <ghudson@mit.edu>
Date: Tue Apr 11 17:00:01 2017 -0400
Check for FAST in encrypted challenge client
If we reach the encrypted challenge clpreauth process method without
an armor key, error out instead of crashing. This can happen if (a)
the KDC offers encrypted challenge even though the request doesn't use
FAST (the Heimdal KDC apparently does this), and (b) we fall back to
that preauth method before generating a preauthenticated request,
typically because of a prompter failure in encrypted timestamp.
Reported by Nico Williams.
(cherry picked from commit ff6aac3e018e80fa32df2e14446c6ed9595dfc3c)
ticket: 8573
version_fixed: 1.14.6
src/lib/krb5/krb/preauth_ec.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/src/lib/krb5/krb/preauth_ec.c b/src/lib/krb5/krb/preauth_ec.c
index b197833..c1aa909 100644
--- a/src/lib/krb5/krb/preauth_ec.c
+++ b/src/lib/krb5/krb/preauth_ec.c
@@ -58,6 +58,8 @@ ec_process(krb5_context context, krb5_clpreauth_moddata moddata,
krb5_keyblock *challenge_key = NULL, *armor_key, *as_key;
armor_key = cb->fast_armor(context, rock);
+ if (armor_key == NULL)
+ return ENOENT;
retval = cb->get_as_key(context, rock, &as_key);
if (retval == 0 && padata->length) {
krb5_enc_data *enc = NULL;
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