dane_verify_crt(3)

NAME
dane_verify_crt - API function

SYNOPSIS
#include <gnutls/dane.h>

int dane_verify_crt(dane_state_t s, const gnutls_datum_t * chain, unsigned chain_size, gnutls_certificate_type_t chain_type, const char * hostname, const char * proto, unsigned int port, unsigned int sflags, unsigned int vflags, unsigned int * verify);

ARGUMENTS

dane_state_t s
    A DANE state structure (may be NULL)

const gnutls_datum_t * chain
    A certificate chain

unsigned chain_size
    The size of the chain

gnutls_certificate_type_t chain_type
    The type of the certificate chain

const char * hostname
    The hostname associated with the chain

const char * proto
    The protocol of the service connecting (e.g. tcp)

unsigned int port
    The port of the service connecting (e.g. 443)

unsigned int sflags
    Flags for the the initialization of s (if NULL)

unsigned int vflags
    Verification flags; an OR'ed list of dane_verify_flags_t.

unsigned int * verify
    An OR'ed list of dane_verify_status_t.

DESCRIPTION
This function will verify the given certificate chain against the CA constrains and/or the certificate available via DANE. If no information via DANE can be obtained the flag DANE_VERIFY_NO_DANE_INFO is set. If a DNSSEC signature is not available for the DANE record then the verify flag DANE_VERIFY_NO_DNSSEC_DATA is set.

Due to the many possible options of DANE, there is no single threat model countered. When notifying the user about DANE verification results it may be better to mention: DANE verification did not reject the certificate, rather than mentioning a successful DANE verication.

Note that this function is designed to be run in addition to PKIX - certificate chain - verification. To be run independently the DANE_VFLAG_ONLY_CHECK_EE_USAGE flag should be specified; then the function will check whether the key of the peer matches the key advertized in the DANE entry.

RETURNS
a negative error code on error and DANE_E_SUCCESS (0) when the DANE entries were successfully parsed, irrespective of whether they were verified (see verify for that information). If no usable entries were encountered DANE_E_REQUESTED_DATA_NOT_AVAILABLE will be returned.

REPORTING BUGS
Report bugs to <bugs@gnutls.org>.
Home page: http://www.gnutls.org

COPYRIGHT
Copyright © 2001-2016 Free Software Foundation, Inc., and others.
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.

SEE ALSO
The full documentation for gnutls is maintained as a Texinfo manual. If the /usr/share/doc/gnutls/ directory does not contain the HTML form visit

http://www.gnutls.org/manual/