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SSL_CTX_SET_CERT_VERIFY_CALLBACK(3) OpenSSLSSL_CTX_SET_CERT_VERIFY_CALLBACK(3)

NAME
       SSL_CTX_set_cert_verify_callback	- set peer certificate verification
       procedure

SYNOPSIS
	#include <openssl/ssl.h>

	void SSL_CTX_set_cert_verify_callback(SSL_CTX *ctx,
					      int (*callback)(X509_STORE_CTX *,	void *),
					      void *arg);

DESCRIPTION
       SSL_CTX_set_cert_verify_callback() sets the verification	callback
       function	for ctx. SSL objects that are created from ctx inherit the
       setting valid at	the time when SSL_new(3) is called.

NOTES
       Whenever	a certificate is verified during a SSL/TLS handshake, a
       verification function is	called.	If the application does	not explicitly
       specify a verification callback function, the built-in verification
       function	is used.  If a verification callback callback is specified via
       SSL_CTX_set_cert_verify_callback(), the supplied	callback function is
       called instead. By setting callback to NULL, the	default	behaviour is
       restored.

       When the	verification must be performed,	callback will be called	with
       the arguments callback(X509_STORE_CTX *x509_store_ctx, void *arg). The
       argument	arg is specified by the	application when setting callback.

       callback	should return 1	to indicate verification success and 0 to
       indicate	verification failure. If SSL_VERIFY_PEER is set	and callback
       returns 0, the handshake	will fail. As the verification procedure may
       allow the connection to continue	in the case of failure (by always
       returning 1) the	verification result must be set	in any case using the
       error member of x509_store_ctx so that the calling application will be
       informed	about the detailed result of the verification procedure!

       Within x509_store_ctx, callback has access to the verify_callback
       function	set using SSL_CTX_set_verify(3).

RETURN VALUES
       SSL_CTX_set_cert_verify_callback() does not return a value.

WARNINGS
       Do not mix the verification callback described in this function with
       the verify_callback function called during the verification process.
       The latter is set using the SSL_CTX_set_verify(3) family	of functions.

       Providing a complete verification procedure including certificate
       purpose settings	etc is a complex task. The built-in procedure is quite
       powerful	and in most cases it should be sufficient to modify its
       behaviour using the verify_callback function.

BUGS
       SSL_CTX_set_cert_verify_callback() does not provide diagnostic
       information.

SEE ALSO
       ssl(7), SSL_CTX_set_verify(3), SSL_get_verify_result(3),
       SSL_CTX_load_verify_locations(3)

COPYRIGHT
       Copyright 2001-2018 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>.

1.1.1a				  2018-11-2SSL_CTX_SET_CERT_VERIFY_CALLBACK(3)

NAME | SYNOPSIS | DESCRIPTION | NOTES | RETURN VALUES | WARNINGS | BUGS | SEE ALSO | COPYRIGHT

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