SSL_get_verify_result.3ossl - Man Page

 #include <openssl/ssl.h>

 long SSL_get_verify_result(const SSL *ssl);

SSL_get_verify_result() returns the result of the verification of the X509 certificate presented by the peer, if any.

SSL_get_verify_result() can only return one error code while the verification of a certificate can fail because of many reasons at the same time. Only the last verification error that occurred during the processing is available from SSL_get_verify_result().

Sometimes there can be a sequence of errors leading to the verification failure as reported by SSL_get_verify_result(). To get the errors, it is necessary to setup a verify callback via SSL_CTX_set_verify(3) or SSL_set_verify(3) and retrieve the errors from the error stack there, because once SSL_connect(3) returns, these errors may no longer be available.

The verification result is part of the established session and is restored when a session is reused.

If no peer certificate was presented, the returned result code is X509_V_OK. This is because no verification error occurred, it does however not indicate success. SSL_get_verify_result() is only useful in connection with SSL_get_peer_certificate(3).

The following return values can currently occur:

X509_V_OK

The verification succeeded or no peer certificate was presented.

Any other value

Documented in openssl-verify(1).

ssl(7), SSL_set_verify_result(3), SSL_get_peer_certificate(3), openssl-verify(1)

Copyright 2000-2023 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (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>.

ossl-guide-tls-client-block.7ossl(7), SSL_CTX_dane_enable.3ossl(3), SSL_CTX_set_cert_verify_callback.3ossl(3), SSL_CTX_set_ct_validation_callback.3ossl(3), SSL_CTX_set_verify.3ossl(3), SSL_get0_peer_rpk.3ossl(3), SSL_get_peer_certificate.3ossl(3), SSL_set1_host.3ossl(3), SSL_set_verify_result.3ossl(3), X509_check_host.3ossl(3).