SSL_GET_PEER_CERTIFICATE - Online Linux Manual Page

Section : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMESSL_get_peer_certificate − get the X509 certificate of the peer
SYNOPSIS​ #include <openssl/ssl.h> ​ ​ X509 *SSL_get_peer_certificate(const SSL *ssl);
DESCRIPTION​SSL_get_peer_certificate() returns a pointer to the X509 certificate the peer presented. If the peer did not present a certificate, NULL is returned.
NOTESDue to the protocol definition, a TLS/SSL server will always send a certificate, if present. A client will only send a certificate when explicitly requested to do so by the server (see ​SSL_CTX_set_verify (3)). If an anonymous cipher is used, no certificates are sent. That a certificate is returned does not indicate information about the verification state, use SSL_get_verify_result (3) to check the verification state. The reference count of the X509 object is incremented by one, so that it will not be destroyed when the session containing the peer certificate is freed. The X509 object must be explicitly freed using X509_free().
RETURN VALUESThe following return values can occur: NULL No certificate was presented by the peer or no connection was established. Pointer to an X509 certificate The return value points to the certificate presented by the peer.
SEE ALSO​ssl (7), SSL_get_verify_result (3), ​SSL_CTX_set_verify (3)
COPYRIGHTCopyright 2000−2016 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 in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>. 0
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