dnssec.py 文件源码

def _validate(rrset, rrsigset, keys, origin=None, now=None):
    """Validate an RRset

    @param rrset: The RRset to validate
    @type rrset: dns.rrset.RRset or (dns.name.Name, dns.rdataset.Rdataset)
    tuple
    @param rrsigset: The signature RRset
    @type rrsigset: dns.rrset.RRset or (dns.name.Name, dns.rdataset.Rdataset)
    tuple
    @param keys: The key dictionary.
    @type keys: a dictionary keyed by dns.name.Name with node or rdataset
    values
    @param origin: The origin to use for relative names
    @type origin: dns.name.Name or None
    @param now: The time to use when validating the signatures.  The default
    is the current time.
    @type now: int
    """

    if isinstance(origin, string_types):
        origin = dns.name.from_text(origin, dns.name.root)

    if isinstance(rrset, tuple):
        rrname = rrset[0]
    else:
        rrname = rrset.name

    if isinstance(rrsigset, tuple):
        rrsigname = rrsigset[0]
        rrsigrdataset = rrsigset[1]
    else:
        rrsigname = rrsigset.name
        rrsigrdataset = rrsigset

    rrname = rrname.choose_relativity(origin)
    rrsigname = rrname.choose_relativity(origin)
    if rrname != rrsigname:
        raise ValidationFailure("owner names do not match")

    for rrsig in rrsigrdataset:
        try:
            _validate_rrsig(rrset, rrsig, keys, origin, now)
            return
        except ValidationFailure:
            pass
    raise ValidationFailure("no RRSIGs validated")