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dnskeybase.py	2.79 MB	View DL Edit
dsbase.py	3.35 MB	View DL Edit
euibase.py	2.57 MB	View DL Edit
mxbase.py	3.12 MB	View DL Edit
nsbase.py	2.27 MB	View DL Edit
svcbbase.py	16.28 MB	View DL Edit
tlsabase.py	2.54 MB	View DL Edit
txtbase.py	3.52 MB	View DL Edit
util.py	8.79 MB	View DL Edit
__init__.py	1.05 MB	View DL Edit

Edit file: /usr/lib/python3.9/site-packages/dns/rdtypes/dsbase.py

# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

# Copyright (C) 2010, 2011 Nominum, Inc.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose with or without fee is hereby granted,
# provided that the above copyright notice and this permission notice
# appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

import binascii
import struct

import dns.dnssectypes
import dns.immutable
import dns.rdata
import dns.rdatatype

@dns.immutable.immutable
class DSBase(dns.rdata.Rdata):
    """Base class for rdata that is like a DS record"""

__slots__ = ["key_tag", "algorithm", "digest_type", "digest"]

# Digest types registry:
    # https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml
    _digest_length_by_type = {
        1: 20,  # SHA-1, RFC 3658 Sec. 2.4
        2: 32,  # SHA-256, RFC 4509 Sec. 2.2
        3: 32,  # GOST R 34.11-94, RFC 5933 Sec. 4 in conjunction with RFC 4490 Sec. 2.1
        4: 48,  # SHA-384, RFC 6605 Sec. 2
    }

def __init__(self, rdclass, rdtype, key_tag, algorithm, digest_type, digest):
        super().__init__(rdclass, rdtype)
        self.key_tag = self._as_uint16(key_tag)
        self.algorithm = dns.dnssectypes.Algorithm.make(algorithm)
        self.digest_type = dns.dnssectypes.DSDigest.make(self._as_uint8(digest_type))
        self.digest = self._as_bytes(digest)
        try:
            if len(self.digest) != self._digest_length_by_type[self.digest_type]:
                raise ValueError("digest length inconsistent with digest type")
        except KeyError:
            if self.digest_type == 0:  # reserved, RFC 3658 Sec. 2.4
                raise ValueError("digest type 0 is reserved")

def to_text(self, origin=None, relativize=True, **kw):
        kw = kw.copy()
        chunksize = kw.pop("chunksize", 128)
        return "%d %d %d %s" % (
            self.key_tag,
            self.algorithm,
            self.digest_type,
            dns.rdata._hexify(self.digest, chunksize=chunksize, **kw),
        )

@classmethod
    def from_text(
        cls, rdclass, rdtype, tok, origin=None, relativize=True, relativize_to=None
    ):
        key_tag = tok.get_uint16()
        algorithm = tok.get_string()
        digest_type = tok.get_uint8()
        digest = tok.concatenate_remaining_identifiers().encode()
        digest = binascii.unhexlify(digest)
        return cls(rdclass, rdtype, key_tag, algorithm, digest_type, digest)

def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
        header = struct.pack("!HBB", self.key_tag, self.algorithm, self.digest_type)
        file.write(header)
        file.write(self.digest)

@classmethod
    def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
        header = parser.get_struct("!HBB")
        digest = parser.get_remaining()
        return cls(rdclass, rdtype, header[0], header[1], header[2], digest)

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