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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 calendar
import struct
import time
import dns.dnssectypes
import dns.exception
import dns.immutable
import dns.rdata
import dns.rdatatype
class BadSigTime(dns.exception.DNSException):
"""Time in DNS SIG or RRSIG resource record cannot be parsed."""
def sigtime_to_posixtime(what):
if len(what) <= 10 and what.isdigit():
return int(what)
if len(what) != 14:
raise BadSigTime
year = int(what[0:4])
month = int(what[4:6])
day = int(what[6:8])
hour = int(what[8:10])
minute = int(what[10:12])
second = int(what[12:14])
return calendar.timegm((year, month, day, hour, minute, second, 0, 0, 0))
def posixtime_to_sigtime(what):
return time.strftime("%Y%m%d%H%M%S", time.gmtime(what))
@dns.immutable.immutable
class RRSIG(dns.rdata.Rdata):
"""RRSIG record"""
__slots__ = [
"type_covered",
"algorithm",
"labels",
"original_ttl",
"expiration",
"inception",
"key_tag",
"signer",
"signature",
]
def __init__(
self,
rdclass,
rdtype,
type_covered,
algorithm,
labels,
original_ttl,
expiration,
inception,
key_tag,
signer,
signature,
):
super().__init__(rdclass, rdtype)
self.type_covered = self._as_rdatatype(type_covered)
self.algorithm = dns.dnssectypes.Algorithm.make(algorithm)
self.labels = self._as_uint8(labels)
self.original_ttl = self._as_ttl(original_ttl)
self.expiration = self._as_uint32(expiration)
self.inception = self._as_uint32(inception)
self.key_tag = self._as_uint16(key_tag)
self.signer = self._as_name(signer)
self.signature = self._as_bytes(signature)
def covers(self):
return self.type_covered
def to_text(self, origin=None, relativize=True, **kw):
return (
f"{dns.rdatatype.to_text(self.type_covered)} "
f"{self.algorithm} {self.labels} {self.original_ttl} "
f"{posixtime_to_sigtime(self.expiration)} "
f"{posixtime_to_sigtime(self.inception)} "
f"{self.key_tag} "
f"{self.signer.choose_relativity(origin, relativize)} "
f"{dns.rdata._base64ify(self.signature, **kw)}" # pyright: ignore
)
@classmethod
def from_text(
cls, rdclass, rdtype, tok, origin=None, relativize=True, relativize_to=None
):
type_covered = dns.rdatatype.from_text(tok.get_string())
algorithm = dns.dnssectypes.Algorithm.from_text(tok.get_string())
labels = tok.get_int()
original_ttl = tok.get_ttl()
expiration = sigtime_to_posixtime(tok.get_string())
inception = sigtime_to_posixtime(tok.get_string())
key_tag = tok.get_int()
signer = tok.get_name(origin, relativize, relativize_to)
b64 = tok.concatenate_remaining_identifiers().encode()
signature = base64.b64decode(b64)
return cls(
rdclass,
rdtype,
type_covered,
algorithm,
labels,
original_ttl,
expiration,
inception,
key_tag,
signer,
signature,
)
def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
header = struct.pack(
"!HBBIIIH",
self.type_covered,
self.algorithm,
self.labels,
self.original_ttl,
self.expiration,
self.inception,
self.key_tag,
)
file.write(header)
self.signer.to_wire(file, None, origin, canonicalize)
file.write(self.signature)
@classmethod
def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
header = parser.get_struct("!HBBIIIH")
signer = parser.get_name(origin)
signature = parser.get_remaining()
return cls(rdclass, rdtype, *header, signer, signature) # pyright: ignore
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