SSL_get_peer_certificate(3)

     SSL_get_peer_certificat0.9.6h (2001-09SSL_get_peer_certificate(3)

     NAME
          SSL_get_peer_certificate - get the X509 certificate of the
          peer

     SYNOPSIS
           #include <openssl/ssl.h>

           X509 *SSL_get_peer_certificate(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.

     NOTES
          Due 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 VALUES
          The 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(3), SSL_get_verify_result(3), SSL_CTX_set_verify(3)

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