OpenBSD 6.7 errata 004 6.7/004_libssl.patch.siglibressl-v3.1.2

original commits:

CVSROOT:        /cvs
Module name:    src
Changes by:     jsing@cvs.openbsd.org   2020/05/16 08:44:55

Modified files:
        lib/libssl     : tls13_client.c

Log message:
Ensure that a TLSv1.3 server has provided a certificate.

The RFC requires that a server always provide a certificate for
authentication. Ensure that this is the case, rather than proceeding and
attempting validation. In the case where validation was disabled and the
server returned an empty certificate list, this would have previously
resulted in a NULL pointer deference.

Issue reported by otto@

ok inoguchi@ tb@

CVSROOT:        /cvs
Module name:    src
Changes by:     jsing@cvs.openbsd.org   2020/05/17 08:26:15

Modified files:
        lib/libssl     : tls13_client.c

Log message:
Send a decode error alert if a server provides an empty certificate list.

According to RFC 8446 section 4.4.2.4, a client receiving an empty
certificate list must abort the handshake with a decode error alert.

ok beck@ inoguchi@ tb@ ('it rarely is the alert you'd expect it to be...')

1 files changed, 2 insertions, 1 deletions

diff --git a/src/lib/libssl/tls13_internal.h b/src/lib/libssl/tls13_internal.h
index d53672dbfe..b543e08900 100644
--- a/src/lib/libssl/tls13_internal.h
+++ b/src/lib/libssl/tls13_internal.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: tls13_internal.h,v 1.67 2020/04/28 20:37:22 jsing Exp $ */
+/* $OpenBSD: tls13_internal.h,v 1.67.4.1 2020/05/19 20:22:33 tb Exp $ */
 /*
  * Copyright (c) 2018 Bob Beck <beck@openbsd.org>
  * Copyright (c) 2018 Theo Buehler <tb@openbsd.org>
@@ -43,6 +43,7 @@ __BEGIN_HIDDEN_DECLS
 #define TLS13_ERR_HRR_FAILED            17
 #define TLS13_ERR_TRAILING_DATA         18
 #define TLS13_ERR_NO_SHARED_CIPHER      19
+#define TLS13_ERR_NO_PEER_CERTIFICATE   21
 
 typedef void (*tls13_alert_cb)(uint8_t _alert_desc, void *_cb_arg);
 typedef ssize_t (*tls13_phh_recv_cb)(void *_cb_arg, CBS *_cbs);