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The behaviour of SSL_get_servername() is quite complicated and depends on numerous factors such as whether it is called on the client or the server, whether it is called before or after the handshake, what protocol version was negotiated, and whether a resumption was attempted or was successful. We attempt to document the behavior more clearly. Reviewed-by: Ben Kaduk <kaduk@mit.edu> (Merged from https://github.com/openssl/openssl/pull/10018)
78 lines
2.5 KiB
Plaintext
78 lines
2.5 KiB
Plaintext
=pod
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=head1 NAME
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SSL_SESSION_get0_hostname,
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SSL_SESSION_set1_hostname,
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SSL_SESSION_get0_alpn_selected,
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SSL_SESSION_set1_alpn_selected
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- get and set SNI and ALPN data associated with a session
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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const char *SSL_SESSION_get0_hostname(const SSL_SESSION *s);
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int SSL_SESSION_set1_hostname(SSL_SESSION *s, const char *hostname);
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void SSL_SESSION_get0_alpn_selected(const SSL_SESSION *s,
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const unsigned char **alpn,
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size_t *len);
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int SSL_SESSION_set1_alpn_selected(SSL_SESSION *s, const unsigned char *alpn,
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size_t len);
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=head1 DESCRIPTION
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SSL_SESSION_get0_hostname() retrieves the SNI value that was sent by the
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client when the session was created if it was accepted by the server and TLSv1.2
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or below was negotiated. Otherwise NULL is returned. Note that in TLSv1.3 the
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SNI hostname is negotiated with each handshake including resumption handshakes
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and is therefore never associated with the session.
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The value returned is a pointer to memory maintained within B<s> and
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should not be free'd.
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SSL_SESSION_set1_hostname() sets the SNI value for the hostname to a copy of
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the string provided in hostname.
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SSL_SESSION_get0_alpn_selected() retrieves the selected ALPN protocol for this
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session and its associated length in bytes. The returned value of B<*alpn> is a
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pointer to memory maintained within B<s> and should not be free'd.
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SSL_SESSION_set1_alpn_selected() sets the ALPN protocol for this session to the
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value in B<alpn> which should be of length B<len> bytes. A copy of the input
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value is made, and the caller retains ownership of the memory pointed to by
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B<alpn>.
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=head1 RETURN VALUES
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SSL_SESSION_get0_hostname() returns either a string or NULL based on if there
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is the SNI value sent by client.
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SSL_SESSION_set1_hostname() returns 1 on success or 0 on error.
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SSL_SESSION_set1_alpn_selected() returns 1 on success or 0 on error.
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=head1 SEE ALSO
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L<ssl(7)>,
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L<d2i_SSL_SESSION(3)>,
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L<SSL_SESSION_get_time(3)>,
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L<SSL_SESSION_free(3)>
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=head1 HISTORY
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The SSL_SESSION_set1_hostname(), SSL_SESSION_get0_alpn_selected() and
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SSL_SESSION_set1_alpn_selected() functions were added in OpenSSL 1.1.1.
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=head1 COPYRIGHT
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Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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