Commit 6ed107c8 authored by Matthew Pounsett's avatar Matthew Pounsett

fixing line-endings to be unix

parent 73d9e61e
############################################################################
# Copyright (C) 2016 Internet Systems Consortium, Inc. ("ISC")
#
# Permission to use, copy, modify, and/or distribute this software 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 ISC DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS. IN NO EVENT SHALL ISC 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.
############################################################################
# rndc.py
# This module implements the RNDC control protocol.
############################################################################
from collections import OrderedDict
from exceptions import TypeError
import time
import struct
import hashlib
import hmac
import base64
import random
import socket
class rndc(object):
"""RNDC protocol client library"""
__algos = {'md5': 157,
'sha1': 161,
'sha224': 162,
'sha256': 163,
'sha384': 164,
'sha512': 165}
def __init__(self, host, algo, secret):
"""Creates a persistent connection to RNDC and logs in
host - (ip, port) tuple
algo - HMAC algorithm, one of md5, sha1, sha224, sha256, sha384, sha512
secret - HMAC secret, base64 encoded"""
self.host = host
self.algo = algo
self.hlalgo = getattr(hashlib, algo)
self.secret = base64.b64decode(secret)
self.ser = random.randint(0, 1 << 24)
self.nonce = None
self.__connect_login()
def call(self, cmd):
"""Call a RNDC command, all parsing is done on the server side
cmd - a complete string with a command (eg 'reload zone example.com')
"""
return dict(self.__command(type=cmd)['_data'])
def __serialize_dict(self, data, ignore_auth=False):
rv = ''
for k, v in data.iteritems():
if ignore_auth and k == '_auth':
continue
rv += chr(len(k))
rv += k
if type(v) == str:
rv += struct.pack('>BI', 1, len(v)) + v
elif type(v) == OrderedDict:
sd = self.__serialize_dict(v)
rv += struct.pack('>BI', 2, len(sd)) + sd
else:
raise NotImplementedError('Cannot serialize element of type %s'
% type(v))
return rv
def __prep_message(self, *args, **kwargs):
self.ser += 1
now = int(time.time())
data = OrderedDict(*args, **kwargs)
d = OrderedDict()
d['_auth'] = OrderedDict()
d['_ctrl'] = OrderedDict()
d['_ctrl']['_ser'] = str(self.ser)
d['_ctrl']['_tim'] = str(now)
d['_ctrl']['_exp'] = str(now+60)
if self.nonce is not None:
d['_ctrl']['_nonce'] = self.nonce
d['_data'] = data
msg = self.__serialize_dict(d, ignore_auth=True)
hash = hmac.new(self.secret, msg, self.hlalgo).digest()
bhash = base64.b64encode(hash)
if self.algo == 'md5':
d['_auth']['hmd5'] = struct.pack('22s', bhash)
else:
d['_auth']['hsha'] = struct.pack('B88s',
self.__algos[self.algo], bhash)
msg = self.__serialize_dict(d)
msg = struct.pack('>II', len(msg) + 4, 1) + msg
return msg
def __verify_msg(self, msg):
if self.nonce is not None and msg['_ctrl']['_nonce'] != self.nonce:
return False
bhash = msg['_auth']['hmd5' if self.algo == 'md5' else 'hsha']
bhash += '=' * (4 - (len(bhash) % 4))
remote_hash = base64.b64decode(bhash)
my_msg = self.__serialize_dict(msg, ignore_auth=True)
my_hash = hmac.new(self.secret, my_msg, self.hlalgo).digest()
return (my_hash == remote_hash)
def __command(self, *args, **kwargs):
msg = self.__prep_message(*args, **kwargs)
sent = self.socket.send(msg)
if sent != len(msg):
raise IOError("Cannot send the message")
header = self.socket.recv(8)
if len(header) != 8:
# What should we throw here? Bad auth can cause this...
raise IOError("Can't read response header")
length, version = struct.unpack('>II', header)
if version != 1:
raise NotImplementedError('Wrong message version %d' % version)
# it includes the header
length -= 4
data = self.socket.recv(length, socket.MSG_WAITALL)
if len(data) != length:
raise IOError("Can't read response data")
msg = self.__parse_message(data)
if not self.__verify_msg(msg):
raise IOError("Authentication failure")
return msg
def __connect_login(self):
self.socket = socket.create_connection(self.host)
self.nonce = None
msg = self.__command(type='null')
self.nonce = msg['_ctrl']['_nonce']
def __parse_element(self, input):
pos = 0
labellen = ord(input[pos])
pos += 1
label = input[pos:pos+labellen]
pos += labellen
type = ord(input[pos])
pos += 1
datalen = struct.unpack('>I', input[pos:pos+4])[0]
pos += 4
data = input[pos:pos+datalen]
pos += datalen
rest = input[pos:]
if type == 1: # raw binary value
return label, data, rest
elif type == 2: # dictionary
d = OrderedDict()
while len(data) > 0:
ilabel, value, data = self.__parse_element(data)
d[ilabel] = value
return label, d, rest
# TODO type 3 - list
else:
raise NotImplementedError('Unknown element type %d' % type)
def __parse_message(self, input):
rv = OrderedDict()
hdata = None
while len(input) > 0:
label, value, input = self.__parse_element(input)
rv[label] = value
return rv
############################################################################
# Copyright (C) 2016 Internet Systems Consortium, Inc. ("ISC")
#
# Permission to use, copy, modify, and/or distribute this software 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 ISC DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS. IN NO EVENT SHALL ISC 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.
############################################################################
# rndc.py
# This module implements the RNDC control protocol.
############################################################################
from collections import OrderedDict
from exceptions import TypeError
import time
import struct
import hashlib
import hmac
import base64
import random
import socket
class rndc(object):
"""RNDC protocol client library"""
__algos = {'md5': 157,
'sha1': 161,
'sha224': 162,
'sha256': 163,
'sha384': 164,
'sha512': 165}
def __init__(self, host, algo, secret):
"""Creates a persistent connection to RNDC and logs in
host - (ip, port) tuple
algo - HMAC algorithm, one of md5, sha1, sha224, sha256, sha384, sha512
secret - HMAC secret, base64 encoded"""
self.host = host
self.algo = algo
self.hlalgo = getattr(hashlib, algo)
self.secret = base64.b64decode(secret)
self.ser = random.randint(0, 1 << 24)
self.nonce = None
self.__connect_login()
def call(self, cmd):
"""Call a RNDC command, all parsing is done on the server side
cmd - a complete string with a command (eg 'reload zone example.com')
"""
return dict(self.__command(type=cmd)['_data'])
def __serialize_dict(self, data, ignore_auth=False):
rv = ''
for k, v in data.iteritems():
if ignore_auth and k == '_auth':
continue
rv += chr(len(k))
rv += k
if type(v) == str:
rv += struct.pack('>BI', 1, len(v)) + v
elif type(v) == OrderedDict:
sd = self.__serialize_dict(v)
rv += struct.pack('>BI', 2, len(sd)) + sd
else:
raise NotImplementedError('Cannot serialize element of type %s'
% type(v))
return rv
def __prep_message(self, *args, **kwargs):
self.ser += 1
now = int(time.time())
data = OrderedDict(*args, **kwargs)
d = OrderedDict()
d['_auth'] = OrderedDict()
d['_ctrl'] = OrderedDict()
d['_ctrl']['_ser'] = str(self.ser)
d['_ctrl']['_tim'] = str(now)
d['_ctrl']['_exp'] = str(now+60)
if self.nonce is not None:
d['_ctrl']['_nonce'] = self.nonce
d['_data'] = data
msg = self.__serialize_dict(d, ignore_auth=True)
hash = hmac.new(self.secret, msg, self.hlalgo).digest()
bhash = base64.b64encode(hash)
if self.algo == 'md5':
d['_auth']['hmd5'] = struct.pack('22s', bhash)
else:
d['_auth']['hsha'] = struct.pack('B88s',
self.__algos[self.algo], bhash)
msg = self.__serialize_dict(d)
msg = struct.pack('>II', len(msg) + 4, 1) + msg
return msg
def __verify_msg(self, msg):
if self.nonce is not None and msg['_ctrl']['_nonce'] != self.nonce:
return False
bhash = msg['_auth']['hmd5' if self.algo == 'md5' else 'hsha']
bhash += '=' * (4 - (len(bhash) % 4))
remote_hash = base64.b64decode(bhash)
my_msg = self.__serialize_dict(msg, ignore_auth=True)
my_hash = hmac.new(self.secret, my_msg, self.hlalgo).digest()
return (my_hash == remote_hash)
def __command(self, *args, **kwargs):
msg = self.__prep_message(*args, **kwargs)
sent = self.socket.send(msg)
if sent != len(msg):
raise IOError("Cannot send the message")
header = self.socket.recv(8)
if len(header) != 8:
# What should we throw here? Bad auth can cause this...
raise IOError("Can't read response header")
length, version = struct.unpack('>II', header)
if version != 1:
raise NotImplementedError('Wrong message version %d' % version)
# it includes the header
length -= 4
data = self.socket.recv(length, socket.MSG_WAITALL)
if len(data) != length:
raise IOError("Can't read response data")
msg = self.__parse_message(data)
if not self.__verify_msg(msg):
raise IOError("Authentication failure")
return msg
def __connect_login(self):
self.socket = socket.create_connection(self.host)
self.nonce = None
msg = self.__command(type='null')
self.nonce = msg['_ctrl']['_nonce']
def __parse_element(self, input):
pos = 0
labellen = ord(input[pos])
pos += 1
label = input[pos:pos+labellen]
pos += labellen
type = ord(input[pos])
pos += 1
datalen = struct.unpack('>I', input[pos:pos+4])[0]
pos += 4
data = input[pos:pos+datalen]
pos += datalen
rest = input[pos:]
if type == 1: # raw binary value
return label, data, rest
elif type == 2: # dictionary
d = OrderedDict()
while len(data) > 0:
ilabel, value, data = self.__parse_element(data)
d[ilabel] = value
return label, d, rest
# TODO type 3 - list
else:
raise NotImplementedError('Unknown element type %d' % type)
def __parse_message(self, input):
rv = OrderedDict()
hdata = None
while len(input) > 0:
label, value, input = self.__parse_element(input)
rv[label] = value
return rv
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