# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
# Copyright (C) 2003-2007, 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.dnssectypes
import dns.exception
import dns.immutable
import dns.rdata
import dns.tokenizer
_ctype_by_value = {
1: "PKIX",
2: "SPKI",
3: "PGP",
4: "IPKIX",
5: "ISPKI",
6: "IPGP",
7: "ACPKIX",
8: "IACPKIX",
253: "URI",
254: "OID",
}
_ctype_by_name = {
"PKIX": 1,
"SPKI": 2,
"PGP": 3,
"IPKIX": 4,
"ISPKI": 5,
"IPGP": 6,
"ACPKIX": 7,
"IACPKIX": 8,
"URI": 253,
"OID": 254,
}
def _ctype_from_text(what):
v = _ctype_by_name.get(what)
if v is not None:
return v
return int(what)
def _ctype_to_text(what):
v = _ctype_by_value.get(what)
if v is not None:
return v
return str(what)
[docs]
@dns.immutable.immutable
class CERT(dns.rdata.Rdata):
"""CERT record"""
# see RFC 4398
__slots__ = ["certificate_type", "key_tag", "algorithm", "certificate"]
def __init__(
self, rdclass, rdtype, certificate_type, key_tag, algorithm, certificate
):
super().__init__(rdclass, rdtype)
self.certificate_type = self._as_uint16(certificate_type)
self.key_tag = self._as_uint16(key_tag)
self.algorithm = self._as_uint8(algorithm)
self.certificate = self._as_bytes(certificate)
[docs]
def to_text(self, origin=None, relativize=True, **kw):
certificate_type = _ctype_to_text(self.certificate_type)
return "%s %d %s %s" % (
certificate_type,
self.key_tag,
dns.dnssectypes.Algorithm.to_text(self.algorithm),
dns.rdata._base64ify(self.certificate, **kw),
)
@classmethod
def from_text(
cls, rdclass, rdtype, tok, origin=None, relativize=True, relativize_to=None
):
certificate_type = _ctype_from_text(tok.get_string())
key_tag = tok.get_uint16()
algorithm = dns.dnssectypes.Algorithm.from_text(tok.get_string())
b64 = tok.concatenate_remaining_identifiers().encode()
certificate = base64.b64decode(b64)
return cls(rdclass, rdtype, certificate_type, key_tag, algorithm, certificate)
def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
prefix = struct.pack(
"!HHB", self.certificate_type, self.key_tag, self.algorithm
)
file.write(prefix)
file.write(self.certificate)
@classmethod
def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
(certificate_type, key_tag, algorithm) = parser.get_struct("!HHB")
certificate = parser.get_remaining()
return cls(rdclass, rdtype, certificate_type, key_tag, algorithm, certificate)