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Your IP : 216.73.216.115
"""
"""
# Created on 2015.08.19
#
# Author: Giovanni Cannata
#
# Copyright 2015 - 2020 Giovanni Cannata
#
# This file is part of ldap3.
#
# ldap3 is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# ldap3 is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with ldap3 in the COPYING and COPYING.LESSER files.
# If not, see <http://www.gnu.org/licenses/>.
from pyasn1 import __version__ as pyasn1_version
from pyasn1.codec.ber import decoder # for usage in other modules
from pyasn1.codec.ber.encoder import Encoder # for monkeypatching of boolean value
from ..core.results import RESULT_CODES
from ..utils.conv import to_unicode
from ..protocol.convert import referrals_to_list
CLASSES = {(False, False): 0, # Universal
(False, True): 1, # Application
(True, False): 2, # Context
(True, True): 3} # Private
# Monkeypatching of pyasn1 for encoding Boolean with the value 0xFF for TRUE
# THIS IS NOT PART OF THE FAST BER DECODER
if pyasn1_version == 'xxx0.2.3':
from pyasn1.codec.ber.encoder import tagMap, BooleanEncoder, encode
from pyasn1.type.univ import Boolean
from pyasn1.compat.octets import ints2octs
class BooleanCEREncoder(BooleanEncoder):
_true = ints2octs((255,))
tagMap[Boolean.tagSet] = BooleanCEREncoder()
else:
from pyasn1.codec.ber.encoder import tagMap, typeMap, AbstractItemEncoder
from pyasn1.type.univ import Boolean
from copy import deepcopy
class LDAPBooleanEncoder(AbstractItemEncoder):
supportIndefLenMode = False
if pyasn1_version <= '0.2.3':
from pyasn1.compat.octets import ints2octs
_true = ints2octs((255,))
_false = ints2octs((0,))
def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
return value and self._true or self._false, 0
elif pyasn1_version <= '0.3.1':
def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
return value and (255,) or (0,), False, False
elif pyasn1_version <= '0.3.4':
def encodeValue(self, encodeFun, value, defMode, maxChunkSize, ifNotEmpty=False):
return value and (255,) or (0,), False, False
elif pyasn1_version <= '0.3.7':
def encodeValue(self, value, encodeFun, **options):
return value and (255,) or (0,), False, False
else:
def encodeValue(self, value, asn1Spec, encodeFun, **options):
return value and (255,) or (0,), False, False
customTagMap = deepcopy(tagMap)
customTypeMap = deepcopy(typeMap)
customTagMap[Boolean.tagSet] = LDAPBooleanEncoder()
customTypeMap[Boolean.typeId] = LDAPBooleanEncoder()
encode = Encoder(customTagMap, customTypeMap)
# end of monkey patching
# a fast BER decoder for LDAP responses only
def compute_ber_size(data):
"""
Compute size according to BER definite length rules
Returns size of value and value offset
"""
if data[1] <= 127: # BER definite length - short form. Highest bit of byte 1 is 0, message length is in the last 7 bits - Value can be up to 127 bytes long
return data[1], 2
else: # BER definite length - long form. Highest bit of byte 1 is 1, last 7 bits counts the number of following octets containing the value length
bytes_length = data[1] - 128
value_length = 0
cont = bytes_length
for byte in data[2: 2 + bytes_length]:
cont -= 1
value_length += byte * (256 ** cont)
return value_length, bytes_length + 2
def decode_message_fast(message):
ber_len, ber_value_offset = compute_ber_size(get_bytes(message[:10])) # get start of sequence, at maximum 3 bytes for length
decoded = decode_sequence(message, ber_value_offset, ber_len + ber_value_offset, LDAP_MESSAGE_CONTEXT)
return {
'messageID': decoded[0][3],
'protocolOp': decoded[1][2],
'payload': decoded[1][3],
'controls': decoded[2][3] if len(decoded) == 3 else None
}
def decode_sequence(message, start, stop, context_decoders=None):
decoded = []
while start < stop:
octet = get_byte(message[start])
ber_class = CLASSES[(bool(octet & 0b10000000), bool(octet & 0b01000000))]
ber_constructed = bool(octet & 0b00100000)
ber_type = octet & 0b00011111
ber_decoder = DECODERS[(ber_class, octet & 0b00011111)] if ber_class < 2 else None
ber_len, ber_value_offset = compute_ber_size(get_bytes(message[start: start + 10]))
start += ber_value_offset
if ber_decoder:
value = ber_decoder(message, start, start + ber_len, context_decoders) # call value decode function
else:
# try:
value = context_decoders[ber_type](message, start, start + ber_len) # call value decode function for context class
# except KeyError:
# if ber_type == 3: # Referral in result
# value = decode_sequence(message, start, start + ber_len)
# else:
# raise # re-raise, should never happen
decoded.append((ber_class, ber_constructed, ber_type, value))
start += ber_len
return decoded
def decode_integer(message, start, stop, context_decoders=None):
first = message[start]
value = -1 if get_byte(first) & 0x80 else 0
for octet in message[start: stop]:
value = value << 8 | get_byte(octet)
return value
def decode_octet_string(message, start, stop, context_decoders=None):
return message[start: stop]
def decode_boolean(message, start, stop, context_decoders=None):
return False if message[start: stop] == 0 else True
def decode_bind_response(message, start, stop, context_decoders=None):
return decode_sequence(message, start, stop, BIND_RESPONSE_CONTEXT)
def decode_extended_response(message, start, stop, context_decoders=None):
return decode_sequence(message, start, stop, EXTENDED_RESPONSE_CONTEXT)
def decode_intermediate_response(message, start, stop, context_decoders=None):
return decode_sequence(message, start, stop, INTERMEDIATE_RESPONSE_CONTEXT)
def decode_controls(message, start, stop, context_decoders=None):
return decode_sequence(message, start, stop, CONTROLS_CONTEXT)
def ldap_result_to_dict_fast(response):
response_dict = dict()
response_dict['result'] = int(response[0][3]) # resultCode
response_dict['description'] = RESULT_CODES[response_dict['result']]
response_dict['dn'] = to_unicode(response[1][3], from_server=True) # matchedDN
response_dict['message'] = to_unicode(response[2][3], from_server=True) # diagnosticMessage
if len(response) == 4:
response_dict['referrals'] = referrals_to_list([to_unicode(referral[3], from_server=True) for referral in response[3][3]]) # referrals
else:
response_dict['referrals'] = None
return response_dict
######
if str is not bytes: # Python 3
def get_byte(x):
return x
def get_bytes(x):
return x
else: # Python 2
def get_byte(x):
return ord(x)
def get_bytes(x):
return bytearray(x)
DECODERS = {
# Universal
(0, 1): decode_boolean, # Boolean
(0, 2): decode_integer, # Integer
(0, 4): decode_octet_string, # Octet String
(0, 10): decode_integer, # Enumerated
(0, 16): decode_sequence, # Sequence
(0, 17): decode_sequence, # Set
# Application
(1, 1): decode_bind_response, # Bind response
(1, 4): decode_sequence, # Search result entry
(1, 5): decode_sequence, # Search result done
(1, 7): decode_sequence, # Modify response
(1, 9): decode_sequence, # Add response
(1, 11): decode_sequence, # Delete response
(1, 13): decode_sequence, # ModifyDN response
(1, 15): decode_sequence, # Compare response
(1, 19): decode_sequence, # Search result reference
(1, 24): decode_extended_response, # Extended response
(1, 25): decode_intermediate_response, # intermediate response
(2, 3): decode_octet_string #
}
BIND_RESPONSE_CONTEXT = {
7: decode_octet_string # SaslCredentials
}
EXTENDED_RESPONSE_CONTEXT = {
10: decode_octet_string, # ResponseName
11: decode_octet_string # Response Value
}
INTERMEDIATE_RESPONSE_CONTEXT = {
0: decode_octet_string, # IntermediateResponseName
1: decode_octet_string # IntermediateResponseValue
}
LDAP_MESSAGE_CONTEXT = {
0: decode_controls, # Controls
3: decode_sequence # Referral
}
CONTROLS_CONTEXT = {
0: decode_sequence # Control
}