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SSL_CTX_set_cert_verify_callback.3
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If the application does not explicitly specify a verification callback function, the built-in verification function is used. If a verification callback \fIcallback\fR is specified via \&\fISSL_CTX_set_cert_verify_callback()\fR, the supplied callback function is called instead. By setting \fIcallback\fR to \s-1NULL\s0, the default behaviour is restored. .PP When the verification must be performed, \fIcallback\fR will be called with the arguments callback(X509_STORE_CTX *x509_store_ctx, void *arg). The argument \fIarg\fR is specified by the application when setting \fIcallback\fR. .PP \&\fIcallback\fR should return 1 to indicate verification success and 0 to indicate verification failure. If \s-1SSL_VERIFY_PEER\s0 is set and \fIcallback\fR returns 0, the handshake will fail. As the verification procedure may allow to continue the connection in case of failure (by always returning 1) the verification result must be set in any case using the \fBerror\fR member of \fIx509_store_ctx\fR so that the calling application will be informed about the detailed result of the verification procedure! .PP Within \fIx509_store_ctx\fR, \fIcallback\fR has access to the \fIverify_callback\fR function set using \fISSL_CTX_set_verify\fR\|(3). .SH "WARNINGS" .IX Header "WARNINGS" Do not mix the verification callback described in this function with the \&\fBverify_callback\fR function called during the verification process. The latter is set using the \fISSL_CTX_set_verify\fR\|(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 \fBverify_callback\fR function. .SH "BUGS" .IX Header "BUGS" .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fISSL_CTX_set_cert_verify_callback()\fR does not provide diagnostic information. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIssl\fR\|(3), \fISSL_CTX_set_verify\fR\|(3), \&\fISSL_get_verify_result\fR\|(3), \&\fISSL_CTX_load_verify_locations\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" Previous to OpenSSL 0.9.7, the \fIarg\fR argument to \fBSSL_CTX_set_cert_verify_callback\fR was ignored, and \fIcallback\fR was called simply as int (*callback)(X509_STORE_CTX *) To compile software written for previous versions of OpenSSL, a dummy argument will have to be added to \fIcallback\fR.