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# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
# Copyright (C) 2004-2007, 2009-2011 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 base64
import struct
import dns.exception
import dns.immutable
import dns.rdata
@dns.immutable.immutable
class TKEY(dns.rdata.Rdata):
"""TKEY Record"""
__slots__ = [
"algorithm",
"inception",
"expiration",
"mode",
"error",
"key",
"other",
]
def __init__(
self,
rdclass,
rdtype,
algorithm,
inception,
expiration,
mode,
error,
key,
other=b"",
):
super().__init__(rdclass, rdtype)
self.algorithm = self._as_name(algorithm)
self.inception = self._as_uint32(inception)
self.expiration = self._as_uint32(expiration)
self.mode = self._as_uint16(mode)
self.error = self._as_uint16(error)
self.key = self._as_bytes(key)
self.other = self._as_bytes(other)
def to_text(self, origin=None, relativize=True, **kw):
_algorithm = self.algorithm.choose_relativity(origin, relativize)
text = "%s %u %u %u %u %s" % (
str(_algorithm),
self.inception,
self.expiration,
self.mode,
self.error,
dns.rdata._base64ify(self.key, 0),
)
if len(self.other) > 0:
text += f" {dns.rdata._base64ify(self.other, 0)}"
return text
@classmethod
def from_text(
cls, rdclass, rdtype, tok, origin=None, relativize=True, relativize_to=None
):
algorithm = tok.get_name(relativize=False)
inception = tok.get_uint32()
expiration = tok.get_uint32()
mode = tok.get_uint16()
error = tok.get_uint16()
key_b64 = tok.get_string().encode()
key = base64.b64decode(key_b64)
other_b64 = tok.concatenate_remaining_identifiers(True).encode()
other = base64.b64decode(other_b64)
return cls(
rdclass, rdtype, algorithm, inception, expiration, mode, error, key, other
)
def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
self.algorithm.to_wire(file, compress, origin)
file.write(
struct.pack("!IIHH", self.inception, self.expiration, self.mode, self.error)
)
file.write(struct.pack("!H", len(self.key)))
file.write(self.key)
file.write(struct.pack("!H", len(self.other)))
if len(self.other) > 0:
file.write(self.other)
@classmethod
def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
algorithm = parser.get_name(origin)
inception, expiration, mode, error = parser.get_struct("!IIHH")
key = parser.get_counted_bytes(2)
other = parser.get_counted_bytes(2)
return cls(
rdclass, rdtype, algorithm, inception, expiration, mode, error, key, other
)
# Constants for the mode field - from RFC 2930:
# 2.5 The Mode Field
#
# The mode field specifies the general scheme for key agreement or
# the purpose of the TKEY DNS message. Servers and resolvers
# supporting this specification MUST implement the Diffie-Hellman key
# agreement mode and the key deletion mode for queries. All other
# modes are OPTIONAL. A server supporting TKEY that receives a TKEY
# request with a mode it does not support returns the BADMODE error.
# The following values of the Mode octet are defined, available, or
# reserved:
#
# Value Description
# ----- -----------
# 0 - reserved, see section 7
# 1 server assignment
# 2 Diffie-Hellman exchange
# 3 GSS-API negotiation
# 4 resolver assignment
# 5 key deletion
# 6-65534 - available, see section 7
# 65535 - reserved, see section 7
SERVER_ASSIGNMENT = 1
DIFFIE_HELLMAN_EXCHANGE = 2
GSSAPI_NEGOTIATION = 3
RESOLVER_ASSIGNMENT = 4
KEY_DELETION = 5
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