SSL_GET_VERIFY_RESULT(3ssl) OpenSSL SSL_GET_VERIFY_RESULT(3ssl)

SSL_get_verify_result - get result of peer certificate verification

#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:

The verification succeeded or no peer certificate was presented.
Documented in openssl-verify(1).

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

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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.

2024-04-28 3.3.0