Security level >= 3 requires a ciphersuite with PFS

ok beck jsing sthen

1 files changed, 4 insertions, 3 deletions

diff --git a/src/lib/libssl/ssl_seclevel.c b/src/lib/libssl/ssl_seclevel.c
index c3d23b2547..39b1bf341e 100644
--- a/src/lib/libssl/ssl_seclevel.c
+++ b/src/lib/libssl/ssl_seclevel.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: ssl_seclevel.c,v 1.3 2022/06/28 20:49:16 tb Exp $ */
+/*      $OpenBSD: ssl_seclevel.c,v 1.4 2022/06/28 20:53:32 tb Exp $ */
 /*
  * Copyright (c) 2020 Theo Buehler <tb@openbsd.org>
  *
@@ -114,8 +114,9 @@ ssl_security_secop_cipher(const SSL_CTX *ctx, const SSL *ssl, int bits,
         if (security_level <= 2)
                 return 1;
 
-        /* XXX TLSv1.3 */
-        if ((cipher->algorithm_mkey & (SSL_kDHE | SSL_kECDHE)) != 0)
+        /* Security level >= 3 requires a cipher with forward secrecy. */
+        if ((cipher->algorithm_mkey & (SSL_kDHE | SSL_kECDHE)) == 0 &&
+            cipher->algorithm_ssl != SSL_TLSV1_3)
                 return 0;
 
         return 1;