1=pod 2 3=head1 NAME 4 5SSL_get_peer_certificate, 6SSL_get0_peer_certificate, 7SSL_get1_peer_certificate - get the X509 certificate of the peer 8 9=head1 SYNOPSIS 10 11 #include <openssl/ssl.h> 12 13 X509 *SSL_get_peer_certificate(const SSL *ssl); 14 X509 *SSL_get0_peer_certificate(const SSL *ssl); 15 X509 *SSL_get1_peer_certificate(const SSL *ssl); 16 17=head1 DESCRIPTION 18 19These functions return a pointer to the X509 certificate the 20peer presented. If the peer did not present a certificate, NULL is returned. 21 22=head1 NOTES 23 24Due to the protocol definition, a TLS/SSL server will always send a 25certificate, if present. A client will only send a certificate when 26explicitly requested to do so by the server (see 27L<SSL_CTX_set_verify(3)>). If an anonymous cipher 28is used, no certificates are sent. 29 30That a certificate is returned does not indicate information about the 31verification state, use L<SSL_get_verify_result(3)> 32to check the verification state. 33 34The reference count of the X509 object returned by SSL_get1_peer_certificate() 35is incremented by one, so that it will not be destroyed when the session 36containing the peer certificate is freed. The X509 object must be explicitly 37freed using X509_free(). 38 39The reference count of the X509 object returned by SSL_get0_peer_certificate() 40is not incremented, and must not be freed. 41 42SSL_get_peer_certificate() is an alias of SSL_get1_peer_certificate(). 43 44=head1 RETURN VALUES 45 46The following return values can occur: 47 48=over 4 49 50=item NULL 51 52No certificate was presented by the peer or no connection was established. 53 54=item Pointer to an X509 certificate 55 56The return value points to the certificate presented by the peer. 57 58=back 59 60=head1 SEE ALSO 61 62L<ssl(7)>, L<SSL_get_verify_result(3)>, 63L<SSL_CTX_set_verify(3)> 64 65=head1 HISTORY 66 67SSL_get0_peer_certificate() and SSL_get1_peer_certificate() were added in 3.0.0. 68SSL_get_peer_certificate() was deprecated in 3.0.0. 69 70=head1 COPYRIGHT 71 72Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved. 73 74Licensed under the Apache License 2.0 (the "License"). You may not use 75this file except in compliance with the License. You can obtain a copy 76in the file LICENSE in the source distribution or at 77L<https://www.openssl.org/source/license.html>. 78 79=cut 80