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-.\"
-.\"     $OpenBSD: SSL_CTX_set_cert_verify_callback.3,v 1.2 2014/12/02 14:11:01 jmc Exp $
-.\"
-.Dd $Mdocdate: December 2 2014 $
-.Dt SSL_CTX_SET_CERT_VERIFY_CALLBACK 3
-.Os
-.Sh NAME
-.Nm SSL_CTX_set_cert_verify_callback
-.Nd set peer certificate verification procedure
-.Sh SYNOPSIS
-.In openssl/ssl.h
-.Ft void
-.Fo SSL_CTX_set_cert_verify_callback
-.Fa "SSL_CTX *ctx"
-.Fa "int (*callback)(X509_STORE_CTX *, void *)"
-.Fa "void *arg"
-.Fc
-.Sh DESCRIPTION
-.Fn SSL_CTX_set_cert_verify_callback
-sets the verification callback function for
-.Fa ctx .
-.Vt SSL
-objects that are created from
-.Fa ctx
-inherit the setting valid at the time when
-.Xr SSL_new 3
-is called.
-.Sh 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
-.Fa callback
-is specified via
-.Fn SSL_CTX_set_cert_verify_callback ,
-the supplied callback function is called instead.
-By setting
-.Fa callback
-to
-.Dv NULL ,
-the default behaviour is restored.
-.Pp
-When the verification must be performed,
-.Fa callback
-will be called with the arguments
-.Fn callback "X509_STORE_CTX *x509_store_ctx" "void *arg" .
-The argument
-.Fa arg
-is specified by the application when setting
-.Fa callback .
-.Pp
-.Fa callback
-should return 1 to indicate verification success and 0 to indicate verification
-failure.
-If
-.Dv SSL_VERIFY_PEER
-is set and
-.Fa callback
-returns 0, the handshake will fail.
-As the verification procedure may allow the connection to continue in case of
-failure (by always returning 1) the verification result must be set in any case
-using the
-.Fa error
-member of
-.Fa x509_store_ctx
-so that the calling application will be informed about the detailed result of
-the verification procedure!
-.Pp
-Within
-.Fa x509_store_ctx ,
-.Fa callback
-has access to the
-.Fa verify_callback
-function set using
-.Xr SSL_CTX_set_verify 3 .
-.Sh WARNINGS
-Do not mix the verification callback described in this function with the
-.Fa verify_callback
-function called during the verification process.
-The latter is set using the
-.Xr SSL_CTX_set_verify 3
-family of functions.
-.Pp
-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
-.Fa verify_callback
-function.
-.Sh RETURN VALUES
-.Fn SSL_CTX_set_cert_verify_callback
-does not provide diagnostic information.
-.Sh SEE ALSO
-.Xr ssl 3 ,
-.Xr SSL_CTX_load_verify_locations 3 ,
-.Xr SSL_CTX_set_verify 3 ,
-.Xr SSL_get_verify_result 3
-.Sh HISTORY
-Previous to OpenSSL 0.9.7, the
-.Fa arg
-argument to
-.Fn SSL_CTX_set_cert_verify_callback
-was ignored, and
-.Fa callback
-was called
-simply as
-.Ft int
-.Fn (*callback) "X509_STORE_CTX *" .
-To compile software written for previous versions of OpenSSL,
-a dummy argument will have to be added to
-.Fa callback .