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# Copyright (C) 2017, Red Hat, Inc.
# All rights reserved.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
from asn1crypto import core
from kdcproxy.exceptions import ASN1ParsingError
APPLICATION = 1
class KerberosString(core.GeneralString):
"""KerberosString ::= GeneralString (IA5String)
For compatibility, implementations MAY choose to accept GeneralString
values that contain characters other than those permitted by
IA5String...
"""
class Realm(KerberosString):
"""Realm ::= KerberosString
"""
class ProxyMessage(core.Sequence):
pretty_name = 'KDC-PROXY-MESSAGE'
_fields = [
('kerb-message', core.OctetString, {
'explicit': 0}),
('target-domain', Realm, {
'explicit': 1, 'optional': True}),
('dclocator-hint', core.Integer, {
'explicit': 2, 'optional': True}),
]
class ASREQ(core.Sequence):
pretty_name = 'AS-REQ'
explicit = (APPLICATION, 10)
class TGSREQ(core.Sequence):
pretty_name = 'TGS-REQ'
explicit = (APPLICATION, 12)
class APREQ(core.Sequence):
pretty_name = 'AP-REQ'
explicit = (APPLICATION, 14)
class KRBPriv(core.Sequence):
pretty_name = 'KRBPRiv'
explicit = (APPLICATION, 21)
def decode_proxymessage(data):
req = ProxyMessage.load(data, strict=True)
message = req['kerb-message'].native
realm = req['target-domain'].native
try: # Python 3.x
realm = str(realm, "utf-8")
except TypeError: # Python 2.x
realm = str(realm)
flags = req['dclocator-hint'].native
return message, realm, flags
def encode_proxymessage(data):
rep = ProxyMessage()
rep['kerb-message'] = data
return rep.dump()
def try_decode(data, cls):
try:
req = cls.load(data, strict=True)
except ValueError as e:
raise ASN1ParsingError(e)
return req.pretty_name
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