Document the new SSL_CTX_use_serverinfo_ex() function

Also document other releated changes to the serverinfo capability.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3298)

1 files changed, 35 insertions, 11 deletions

diff --git a/doc/man3/SSL_CTX_use_serverinfo.pod b/doc/man3/SSL_CTX_use_serverinfo.pod
index bd496ff8c5..b1412432f6 100644
--- a/doc/man3/SSL_CTX_use_serverinfo.pod
+++ b/doc/man3/SSL_CTX_use_serverinfo.pod
@@ -2,12 +2,19 @@
 
 =head1 NAME
 
-SSL_CTX_use_serverinfo, SSL_CTX_use_serverinfo_file - use serverinfo extension
+SSL_CTX_use_serverinfo_ex,
+SSL_CTX_use_serverinfo,
+SSL_CTX_use_serverinfo_file
+- use serverinfo extension
 
 =head1 SYNOPSIS
 
  #include <openssl/ssl.h>
 
+ int SSL_CTX_use_serverinfo_ex(SSL_CTX *ctx, unsigned int version,
+                               const unsigned char *serverinfo,
+                               size_t serverinfo_length);
+
  int SSL_CTX_use_serverinfo(SSL_CTX *ctx, const unsigned char *serverinfo,
                             size_t serverinfo_length);
 
@@ -15,20 +22,37 @@ SSL_CTX_use_serverinfo, SSL_CTX_use_serverinfo_file - use serverinfo extension
 
 =head1 DESCRIPTION
 
-These functions load "serverinfo" TLS ServerHello Extensions into the SSL_CTX.
-A "serverinfo" extension is returned in response to an empty ClientHello
+These functions load "serverinfo" TLS extensions into the SSL_CTX. A
+"serverinfo" extension is returned in response to an empty ClientHello
 Extension.
 
-SSL_CTX_use_serverinfo() loads one or more serverinfo extensions from
-a byte array into B<ctx>.  The extensions must be concatenated into a
-sequence of bytes.  Each extension must consist of a 2-byte Extension Type,
-a 2-byte length, and then length bytes of extension_data.
+SSL_CTX_use_serverinfo_ex() loads one or more serverinfo extensions from
+a byte array into B<ctx>. The B<version> parameter specifies the format of the
+byte array provided in B<*serverinfo> which is of length B<serverinfo_length>.
+
+If B<version> is B<SSL_SERVERINFOV2> then the extensions in the array must
+consist of a 4-byte context, a 2-byte Extension Type, a 2-byte length, and then
+length bytes of extension_data. The context and type values have the same
+meaning as for L<SSL_CTX_add_custom_ext(3)>.
+
+If B<version> is B<SSL_SERVERINFOV1> then the extensions in the array must
+consist of a 2-byte Extension Type, a 2-byte length, and then length bytes of
+extension_data. The type value has the same meaning as for
+L<SSL_CTX_add_custom_ext(3)>. The following default context value will be used
+in this case:
+
+ SSL_EXT_TLS1_2_AND_BELOW_ONLY | SSL_EXT_CLIENT_HELLO
+ | SSL_EXT_TLS1_2_SERVER_HELLO | SSL_EXT_IGNORE_ON_RESUMPTION
+
+SSL_CTX_use_serverinfo() does the same thing as SSL_CTX_use_serverinfo_ex()
+except that there is no B<version> parameter so a default version of
+SSL_SERVERINFOV1 is used instead.
 
 SSL_CTX_use_serverinfo_file() loads one or more serverinfo extensions from
 B<file> into B<ctx>.  The extensions must be in PEM format.  Each extension
-must consist of a 2-byte Extension Type, a 2-byte length, and then length
-bytes of extension_data.  Each PEM extension name must begin with the phrase
-"BEGIN SERVERINFO FOR ".
+must be in a format as described above for SSL_CTX_use_serverinfo_ex().  Each
+PEM extension name must begin with the phrase "BEGIN SERVERINFOV2 FOR " for
+SSL_SERVERINFOV2 data or "BEGIN SERVERINFO FOR " for SSL_SERVERINFOV1 data.
 
 If more than one certificate (RSA/DSA) is installed using
 SSL_CTX_use_certificate(), the serverinfo extension will be loaded into the
@@ -46,7 +70,7 @@ the reason.
 
 =head1 COPYRIGHT
 
-Copyright 2013-2016 The OpenSSL Project Authors. All Rights Reserved.
+Copyright 2013-2017 The OpenSSL Project Authors. All Rights Reserved.
 
 Licensed under the OpenSSL license (the "License").  You may not use
 this file except in compliance with the License.  You can obtain a copy