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Edit File : CERT.py \| Size : 3.86 KB
# 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 struct import base64 import dns.exception import dns.dnssec import dns.rdata import dns.tokenizer _ctype_by_value = { 1: 'PKIX', 2: 'SPKI', 3: 'PGP', 253: 'URI', 254: 'OID', } _ctype_by_name = { 'PKIX': 1, 'SPKI': 2, 'PGP': 3, '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) class CERT(dns.rdata.Rdata): """CERT record @ivar certificate_type: certificate type @type certificate_type: int @ivar key_tag: key tag @type key_tag: int @ivar algorithm: algorithm @type algorithm: int @ivar certificate: the certificate or CRL @type certificate: string @see: RFC 2538""" __slots__ = ['certificate_type', 'key_tag', 'algorithm', 'certificate'] def __init__(self, rdclass, rdtype, certificate_type, key_tag, algorithm, certificate): super(CERT, self).__init__(rdclass, rdtype) self.certificate_type = certificate_type self.key_tag = key_tag self.algorithm = algorithm self.certificate = certificate 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.dnssec.algorithm_to_text(self.algorithm), dns.rdata._base64ify(self.certificate)) @classmethod def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True): certificate_type = _ctype_from_text(tok.get_string()) key_tag = tok.get_uint16() algorithm = dns.dnssec.algorithm_from_text(tok.get_string()) if algorithm < 0 or algorithm > 255: raise dns.exception.SyntaxError("bad algorithm type") chunks = [] while 1: t = tok.get().unescape() if t.is_eol_or_eof(): break if not t.is_identifier(): raise dns.exception.SyntaxError chunks.append(t.value.encode()) b64 = b''.join(chunks) certificate = base64.b64decode(b64) return cls(rdclass, rdtype, certificate_type, key_tag, algorithm, certificate) def to_wire(self, file, compress=None, origin=None): prefix = struct.pack("!HHB", self.certificate_type, self.key_tag, self.algorithm) file.write(prefix) file.write(self.certificate) @classmethod def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None): prefix = wire[current: current + 5].unwrap() current += 5 rdlen -= 5 if rdlen < 0: raise dns.exception.FormError (certificate_type, key_tag, algorithm) = struct.unpack("!HHB", prefix) certificate = wire[current: current + rdlen].unwrap() return cls(rdclass, rdtype, certificate_type, key_tag, algorithm, certificate) Back

Edit File : CERT.py | Size : 3.86 KB

# 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 struct
import base64

import dns.exception
import dns.dnssec
import dns.rdata
import dns.tokenizer

_ctype_by_value = {
    1: 'PKIX',
    2: 'SPKI',
    3: 'PGP',
    253: 'URI',
    254: 'OID',
}

_ctype_by_name = {
    'PKIX': 1,
    'SPKI': 2,
    'PGP': 3,
    '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)

class CERT(dns.rdata.Rdata):

"""CERT record

@ivar certificate_type: certificate type
    @type certificate_type: int
    @ivar key_tag: key tag
    @type key_tag: int
    @ivar algorithm: algorithm
    @type algorithm: int
    @ivar certificate: the certificate or CRL
    @type certificate: string
    @see: RFC 2538"""

__slots__ = ['certificate_type', 'key_tag', 'algorithm', 'certificate']

def __init__(self, rdclass, rdtype, certificate_type, key_tag, algorithm,
                 certificate):
        super(CERT, self).__init__(rdclass, rdtype)
        self.certificate_type = certificate_type
        self.key_tag = key_tag
        self.algorithm = algorithm
        self.certificate = certificate

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.dnssec.algorithm_to_text(self.algorithm),
                                dns.rdata._base64ify(self.certificate))

@classmethod
    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
        certificate_type = _ctype_from_text(tok.get_string())
        key_tag = tok.get_uint16()
        algorithm = dns.dnssec.algorithm_from_text(tok.get_string())
        if algorithm < 0 or algorithm > 255:
            raise dns.exception.SyntaxError("bad algorithm type")
        chunks = []
        while 1:
            t = tok.get().unescape()
            if t.is_eol_or_eof():
                break
            if not t.is_identifier():
                raise dns.exception.SyntaxError
            chunks.append(t.value.encode())
        b64 = b''.join(chunks)
        certificate = base64.b64decode(b64)
        return cls(rdclass, rdtype, certificate_type, key_tag,
                   algorithm, certificate)

def to_wire(self, file, compress=None, origin=None):
        prefix = struct.pack("!HHB", self.certificate_type, self.key_tag,
                             self.algorithm)
        file.write(prefix)
        file.write(self.certificate)

@classmethod
    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
        prefix = wire[current: current + 5].unwrap()
        current += 5
        rdlen -= 5
        if rdlen < 0:
            raise dns.exception.FormError
        (certificate_type, key_tag, algorithm) = struct.unpack("!HHB", prefix)
        certificate = wire[current: current + rdlen].unwrap()
        return cls(rdclass, rdtype, certificate_type, key_tag, algorithm,
                   certificate)

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