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"""
"""
# Created on 2015.08.19
#
# Author: Giovanni Cannata
#
# Copyright 2015 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.codec.ber.encoder import tagMap, BooleanEncoder
from pyasn1.type.univ import Boolean
from pyasn1.compat.octets import ints2octs
from .. import RESULT_CODES
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
class BooleanCEREncoder(BooleanEncoder):
_true = ints2octs((255,))
tagMap[Boolean.tagSet] = BooleanCEREncoder()
from pyasn1.codec.ber import encoder, decoder
# 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:
value = context_decoders[ber_type](message, start, start + ber_len) # call value decode function for context class
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'] = response[1][3].decode('utf-8') # matchedDN
response_dict['message'] = response[2][3].decode('utf-8') # diagnosticMessage
if len(response) == 4:
response_dict['referrals'] = referrals_to_list(response[3][3]) # referrals
else:
response_dict['referrals'] = None
return response_dict
######
if str != 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
}
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
}
CONTROLS_CONTEXT = {
0: decode_sequence # Control
}
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