from small one page howto to huge articles all in one place
 

search text in:





Poll
Which linux distribution do you use?







poll results

Last additions:
using iotop to find disk usage hogs

using iotop to find disk usage hogs

words:

887

views:

186369

userrating:

average rating: 1.7 (102 votes) (1=very good 6=terrible)


May 25th. 2007:
Words

486

Views

250361

why adblockers are bad


Workaround and fixes for the current Core Dump Handling vulnerability affected kernels

Workaround and fixes for the current Core Dump Handling vulnerability affected kernels

words:

161

views:

137538

userrating:

average rating: 1.4 (42 votes) (1=very good 6=terrible)


April, 26th. 2006:

Druckversion
You are here: manpages





SSL_CTX_set_cert_verify_callback

Section: OpenSSL (3)
Updated: 2017-05-25
Index Return to Main Contents
 

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 to continue the connection in 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).  

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

 

RETURN VALUES

SSL_CTX_set_cert_verify_callback() does not provide diagnostic information.  

SEE ALSO

ssl(3), SSL_CTX_set_verify(3), SSL_get_verify_result(3), SSL_CTX_load_verify_locations(3)  

HISTORY

Previous to OpenSSL 0.9.7, the arg argument to SSL_CTX_set_cert_verify_callback was ignored, and callback 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 callback.


 

Index

NAME
SYNOPSIS
DESCRIPTION
NOTES
WARNINGS
BUGS
RETURN VALUES
SEE ALSO
HISTORY





Support us on Content Nation
rdf newsfeed | rss newsfeed | Atom newsfeed
- Powered by LeopardCMS - Running on Gentoo -
Copyright 2004-2020 Sascha Nitsch Unternehmensberatung GmbH
Valid XHTML1.1 : Valid CSS : buttonmaker
- Level Triple-A Conformance to Web Content Accessibility Guidelines 1.0 -
- Copyright and legal notices -
Time to create this page: 19.1 ms