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-rw-r--r--doc/ssl/SSL_CTX_set_mode.pod8
-rw-r--r--ssl/ssl.h9
2 files changed, 13 insertions, 4 deletions
diff --git a/doc/ssl/SSL_CTX_set_mode.pod b/doc/ssl/SSL_CTX_set_mode.pod
index 0ee23433ba..f9b838fe6f 100644
--- a/doc/ssl/SSL_CTX_set_mode.pod
+++ b/doc/ssl/SSL_CTX_set_mode.pod
@@ -61,12 +61,16 @@ deal with read/write operations returning without success report. The
flag SSL_MODE_AUTO_RETRY will cause read/write operations to only
return after the handshake and successful completion.
-=item SSL_MODE_FALLBACK_SCSV
+=item SSL_MODE_SEND_FALLBACK_SCSV
Send TLS_FALLBACK_SCSV in the ClientHello.
-To be set by applications that reconnect with a downgraded protocol
+To be set only by applications that reconnect with a downgraded protocol
version; see draft-ietf-tls-downgrade-scsv-00 for details.
+DO NOT ENABLE THIS if your application attempts a normal handshake.
+Only use this in explicit fallback retries, following the guidance
+in draft-ietf-tls-downgrade-scsv-00.
+
=back
=head1 RETURN VALUES
diff --git a/ssl/ssl.h b/ssl/ssl.h
index 6435c5966d..4ea0d80124 100644
--- a/ssl/ssl.h
+++ b/ssl/ssl.h
@@ -564,8 +564,13 @@ typedef struct ssl_session_st
/* Don't attempt to automatically build certificate chain */
#define SSL_MODE_NO_AUTO_CHAIN 0x00000008L
/* Send TLS_FALLBACK_SCSV in the ClientHello.
- * To be set by applications that reconnect with a downgraded protocol
- * version; see draft-ietf-tls-downgrade-scsv-00 for details. */
+ * To be set only by applications that reconnect with a downgraded protocol
+ * version; see draft-ietf-tls-downgrade-scsv-00 for details.
+ *
+ * DO NOT ENABLE THIS if your application attempts a normal handshake.
+ * Only use this in explicit fallback retries, following the guidance
+ * in draft-ietf-tls-downgrade-scsv-00.
+ */
#define SSL_MODE_SEND_FALLBACK_SCSV 0x00000080L