Class KeytabEntry

scapy/modules/ticketer.py:313–362

class KeytabEntry(Packet):
    fields_desc = [
        IntField("size", None),
        FieldLenField("num_components", None, count_of="components"),
        PacketField("realm", KTCountedOctetString(), KTCountedOctetString),
        PacketListField(
            "components",
            [],
            KTCountedOctetString,
            count_from=lambda pkt: pkt.num_components,
        ),
        ConditionalField(
            IntField("name_type", 0),
            lambda pkt: pkt.parent.file_format_version != 0x501,
        ),
        UTCTimeField("timestamp", None),
        ByteField("vno8", 0),
        MayEnd(PacketField("key", KTKeyBlock(), KTKeyBlock)),
        ConditionalField(
            IntField("vno", None),
            lambda pkt: "vno" in pkt.fields is not None or pkt.original,
        ),
    ]

    def getPrincipal(self):
        comp = "/".join(x.data.decode() for x in self.components)
        if self.realm.data:
            return "%s@%s" % (
                comp,
                self.realm.data.decode(),
            )
        else:
            return comp

    @property
    def versionNumber(self):
        if self.vno is not None:
            return self.vno
        return self.vno8

    def post_build(self, p, pay):
        # type: (bytes, bytes) -> bytes
        if self.size is None:
            p = struct.pack("!I", len(p)) + p[4:]
        return p + pay

    def extract_padding(self, s):
        # type: (bytes) -> Tuple[bytes, bytes]
        rem = self.size - len(self.original)
        return s[:rem], s[rem:]


class Keytab(Packet):