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SSL_SESSION_GET0_PEER(3) Library Functions Manual SSL_SESSION_GET0_PEER(3)

SSL_SESSION_get0_peer
get details about peer's certificate for a session

#include <openssl/ssl.h>
X509 *
SSL_SESSION_get0_peer(SSL_SESSION *s);

SSL_SESSION_get0_peer() returns a pointer to the peer certificate associated with the session s or NULL if no peer certificate is available. The caller should not free the returned value, unless X509_up_ref(3) has also been called.

ssl(3), SSL_get_session(3), SSL_SESSION_new(3)

SSL_SESSION_get0_peer() first appeared in OpenSSL 1.0.1 and has been available since OpenBSD 5.3.
March 23, 2018 OpenBSD-current