From 8ec2bde994c272f7b14b4cc4d9232f38b9211cb1 Mon Sep 17 00:00:00 2001 From: Matt Caswell Date: Mon, 3 Sep 2018 11:57:33 +0100 Subject: [PATCH] Clarify the return value of SSL_client_version() The SSL_client_version() function returns the value held in the legacy_version field of the ClientHello. This is never greater than TLSv1.2, even if TLSv1.3 later gets negotiated. Fixes #7079 Reviewed-by: Paul Dale (Merged from https://github.com/openssl/openssl/pull/7095) --- doc/man3/SSL_get_version.pod | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-) diff --git a/doc/man3/SSL_get_version.pod b/doc/man3/SSL_get_version.pod index 9b4924262d..b0aaba3a59 100644 --- a/doc/man3/SSL_get_version.pod +++ b/doc/man3/SSL_get_version.pod @@ -19,17 +19,20 @@ protocol information of a connection =head1 DESCRIPTION -SSL_client_version() returns the protocol version used by the client when -initiating the connection. SSL_get_version() returns the name of the protocol -used for the connection. SSL_version() returns the protocol version used for the -connection. They should only be called after the initial handshake has been -completed. Prior to that the results returned from these functions may be -unreliable. +SSL_client_version() returns the numeric protocol version advertised by the +client in the legacy_version field of the ClientHello when initiating the +connection. Note that, for TLS, this value will never indicate a version greater +than TLSv1.2 even if TLSv1.3 is subsequently negotiated. SSL_get_version() +returns the name of the protocol used for the connection. SSL_version() returns +the numeric protocol version used for the connection. They should only be called +after the initial handshake has been completed. Prior to that the results +returned from these functions may be unreliable. SSL_is_dtls() returns one if the connection is using DTLS, zero if not. =head1 RETURN VALUES + SSL_get_version() returns one of the following strings: =over 4 @@ -60,8 +63,8 @@ This indicates an unknown protocol version. =back -SSL_version() and SSL_client_version() return an integer which could include any of -the following: +SSL_version() and SSL_client_version() return an integer which could include any +of the following: =over 4 @@ -83,7 +86,8 @@ The connection uses the TLSv1.2 protocol. =item TLS1_3_VERSION -The connection uses the TLSv1.3 protocol. +The connection uses the TLSv1.3 protocol (never returned for +SSL_client_version()). =back -- 2.34.1