This function will return certificates CA status, by reading the
basicConstraints X.509 extension (18.104.22.168). If the certificate is a
CA a positive value will be returned, or (0) if the certificate does
not have CA flag set.
Use gnutls_x509_crt_get_basic_constraints() if you want to read the
pathLenConstraint field too.
If the certificate is a CA a positive value will be returned, or (0)
if the certificate does not have CA flag set. A negative error code
may be returned in case of errors. If the certificate does not
contain the basicConstraints extension
GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE will be returned.
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gnutls 3.5.9 gnutls_x509_crt_get_ca_status(3)