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ssl_tls_crypto.py
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#! /usr/bin/env python
# -*- coding: UTF-8 -*-
# Author : [email protected] <github.com/tintinweb>
# http://www.secdev.org/projects/scapy/doc/build_dissect.html
from header import *
import Crypto
from Crypto.Hash import HMAC, MD5, SHA
from Crypto.Util.asn1 import DerSequence
from binascii import a2b_base64
from base64 import b64decode
from Crypto.PublicKey import RSA
from Crypto.Cipher import AES, ARC4, PKCS1_v1_5
import hashlib
from Crypto.Cipher import PKCS1_v1_5#,PKCS1_OAEP
import array
from collections import namedtuple
from hashlib import md5,sha1,sha256
import hmac
from prf import prfForVersion
class TLSSessionCtx(object):
def __init__(self):
self.packets = namedtuple('packets',['history','client','server'])
self.packets.history=[] #packet history
self.packets.client = namedtuple('client',['sequence'])
self.packets.client.sequence=0
self.packets.server = namedtuple('server',['sequence'])
self.packets.server.sequence=0
self.params = namedtuple('params', ['handshake','negotiated',])
self.params.handshake = namedtuple('handshake',['client','server'])
self.params.handshake.client=None
self.params.handshake.server=None
self.params.negotiated = namedtuple('negotiated', ['version','ciphersuite','key_exchange','encryption','mac','compression',])
self.params.negotiated.version=None
self.params.negotiated.ciphersuite=None
self.params.negotiated.isexport=None
self.params.negotiated.key_exchange=None
self.params.negotiated.encryption=None
self.params.negotiated.mac=None
self.params.negotiated.compression=None
self.crypto = namedtuple('crypto', ['client','server'])
self.crypto.client = namedtuple('client', ['enc','dec'])
self.crypto.client.enc = None
self.crypto.client.dec = None
self.crypto.server = namedtuple('server', ['enc','dec','rsa'])
self.crypto.server.enc = None
self.crypto.server.dec = None
self.crypto.server.rsa = namedtuple('rsa', ['cipher','pubkey','privkey'])
self.crypto.server.rsa.cipher=None
self.crypto.server.rsa.pubkey=None
self.crypto.server.rsa.privkey=None
self.crypto.session = namedtuple('session', ['premaster_secret','master_secret'])
self.crypto.session.encrypted_premaster_secret=None
self.crypto.session.premaster_secret=None
self.crypto.session.master_secret=None
self.crypto.session.randombytes = namedtuple('randombytes',['client','server'])
self.crypto.session.randombytes.client=None
self.crypto.session.randombytes.server=None
self.crypto.session.key = namedtuple('key',['client','server'])
self.crypto.session.key.server = namedtuple('server',['mac','encryption','iv'])
self.crypto.session.key.server.mac = None
self.crypto.session.key.server.encryption = None
self.crypto.session.key.server.iv = None
self.crypto.session.key.client = namedtuple('client',['mac','encryption','iv'])
self.crypto.session.key.client.mac = None
self.crypto.session.key.client.encryption = None
self.crypto.session.key.client.iv = None
self.crypto.session.key.length = namedtuple('length',['mac','encryption','iv'])
self.crypto.session.key.length.mac = None
self.crypto.session.key.length.encryption = None
self.crypto.session.key.length.iv = None
self.crypto.session.sequence = namedtuple('sequence',['client','server'])
self.crypto.session.sequence.client=0
self.crypto.session.sequence.server=0
self.cumulatedmsg = ''
def process(self,p):
if p.haslayer(TLSHandshake):
if p.haslayer(TLSClientHello):
if not self.params.handshake.client:
self.params.handshake.client=p[TLSClientHello]
if not self.crypto.session.randombytes.client:
self.crypto.session.randombytes.client=struct.pack("!I",p[TLSClientHello].gmt_unix_time)+p[TLSClientHello].random_bytes
if p.haslayer(TLSServerHello):
if not self.params.handshake.server:
self.params.handshake.server=p[TLSServerHello]
if not self.crypto.session.randombytes.server:
self.crypto.session.randombytes.server=struct.pack("!I",p[TLSServerHello].gmt_unix_time)+p[TLSServerHello].random_bytes
if not self.params.negotiated.ciphersuite:
self.params.negotiated.version=p[TLSServerHello].version
self.params.negotiated.ciphersuite=p[TLSServerHello].cipher_suite
self.params.negotiated.compression=p[TLSServerHello].compression_method
self.parseCipherSuite()
#kex,enc,mac = describe_ciphersuite(self.params.negotiated.ciphersuite)
#self.params.negotiated.key_exchange=kex
#self.params.negotiated.encryption=enc
#self.params.negotiated.mac=mac
if p.haslayer(TLSCertificateList):
if self.params.negotiated.key_exchange and "RSA" in self.params.negotiated.key_exchange:
cert = p[TLSCertificateList].certificates[0].data
self.crypto.server.rsa.pubkey = PKCS1_v1_5.new(x509_extract_pubkey_from_der(cert))
if p.haslayer(TLSClientKeyExchange) and self.crypto.server.rsa.privkey:
self.crypto.session.encrypted_premaster_secret = str(p[TLSClientKeyExchange].load)
self.crypto.session.premaster_secret = self.crypto.server.rsa.cipher.decrypt(self.crypto.session.encrypted_premaster_secret,None)
#print 'PMS',self.crypto.session.premaster_secret.encode('hex')
self.keysFromPreMasterSecret()
# one for encryption and one for decryption to not mess up internal states
self.crypto.client.enc = self.ciphersuite_factory(self.crypto.session.key.client.encryption,self.crypto.session.key.client.iv)
self.crypto.client.dec = self.ciphersuite_factory(self.crypto.session.key.client.encryption,self.crypto.session.key.client.iv)
self.crypto.server.enc = self.ciphersuite_factory(self.crypto.session.key.server.encryption,self.crypto.session.key.server.iv)
self.crypto.server.dec = self.ciphersuite_factory(self.crypto.session.key.server.encryption,self.crypto.session.key.server.iv)
def parseCipherSuite(self):
cs = self.params.negotiated.ciphersuite
macLen = HASH_LENGTH[crypto_params[TLS_CIPHER_SUITE_REGISTRY[cs]]['hash']['name']]
keyLen = crypto_params[TLS_CIPHER_SUITE_REGISTRY[cs]]['cipher']['keyLen']
blocksize = crypto_params[TLS_CIPHER_SUITE_REGISTRY[cs]]['cipher']['type'].block_size
ivLen = 0 if blocksize == 1 else blocksize
self.crypto.session.key.length.mac = macLen
self.crypto.session.key.length.encryption = keyLen
self.crypto.session.key.length.iv = ivLen
def ciphersuite_factory(self, key, iv):
cs = self.params.negotiated.ciphersuite
if cs == 0x0035:
cipher = AES.new(key, AES.MODE_CBC, iv)
elif cs == 0x0003 or cs == 0x0004:
cipher = ARC4.new(key)
else:
raise ValueError('not supported CipherSuite')
return cipher
def check_strip_mac(self, data):
return data[:-self.crypto.session.key.length.mac]
def clientcalhash(self, msg):
return hmac.new(self.crypto.session.key.client.mac, msg, self.params.negotiated.mac).digest()
def servercalhash(self, msg):
return hmac.new(self.crypto.session.key.server.mac, msg, self.params.negotiated.mac).digest()
def clientcalmac(self, data):
seq_header = struct.pack('>Q', self.crypto.session.sequence.client)
self.crypto.session.sequence.client += 1
msg = seq_header + data;
hashvalue = self.clientcalhash(msg)
return hashvalue
def servercalmac(self, data):
seq_header = struct.pack('>Q', self.crypto.session.sequence.server)
self.crypto.session.sequence.server += 1
msg = seq_header + data;
hashvalue = self.servercalhash(msg)
return hashvalue
def calFinish(self, finishedLabel):
msg = md5(self.cumulatedmsg).digest() + sha1(self.cumulatedmsg).digest()
lfinished = [0]*12
prfForVersion(self.params.negotiated.version, lfinished, self.crypto.session.master_secret, finishedLabel, msg)
finished = ''.join(lfinished)
prefix = "1400000c".decode('hex')
return prefix + finished
def keysFromPreMasterSecret(self):
version = self.params.negotiated.version
clientRandom = self.crypto.session.randombytes.client
serverRandom = self.crypto.session.randombytes.server
preMasterSecret = self.crypto.session.premaster_secret
macLen = self.crypto.session.key.length.mac
keyLen = self.crypto.session.key.length.encryption
ivLen = self.crypto.session.key.length.iv
export = self.params.negotiated.isexport
masterSecretLabel = "master secret"
keyExpansionLabel = "key expansion"
#print 'version', version.encode('hex')
#print 'clientrandom', clientRandom.encode('hex')
#print 'serverrandom', serverRandom.encode('hex')
#print macLen, keyLen, ivLen
seed = clientRandom+serverRandom
mastersecret = [0]*48
prfForVersion(version,mastersecret,preMasterSecret,masterSecretLabel,seed)
masterSecret = ''.join(mastersecret)
seed = serverRandom+clientRandom
n = 2*macLen + 2*keyLen + 2*ivLen
keyBlock = [0]*n
prfForVersion(version,keyBlock,masterSecret,keyExpansionLabel,seed)
i=0
clientMAC = keyBlock[i:i+macLen]
clientMAC = ''.join(clientMAC)
i+= macLen
serverMAC = keyBlock[i:i+macLen]
serverMAC = ''.join(serverMAC)
i+=macLen
clientKey = keyBlock[i:i+keyLen]
clientKey = ''.join(clientKey)
i+=keyLen
serverKey = keyBlock[i:i+keyLen]
serverKey = ''.join(serverKey)
i+=keyLen
clientIV = [0]*ivLen
serverIV = [0]*ivLen
if not export: #non-export
clientIV = keyBlock[i:i+ivLen]
clientIV = ''.join(clientIV)
i+=ivLen
serverIV = keyBlock[i:i+ivLen]
serverIV = ''.join(serverIV)
else:
fclientKey = [0]*16
prfForVersion(version, fclientKey, clientKey, "client write key", clientRandom+serverRandom)
fserverKey = [0]*16
prfForVersion(version, fserverKey, serverKey, "server write key", clientRandom+serverRandom)
clientKey = ''.join(fclientKey)
serverKey = ''.join(fserverKey)
ivBlock = [0]*2*ivLen
prfForVersion(version, ivBlock, "", "IV block", clientRandom+serverRandom)
clientIV = ''.join(ivBlock[:ivLen])
serverIV = ''.join(ivBlock[ivLen: 2*ivLen])
self.crypto.session.master_secret = masterSecret
self.crypto.session.key.server.mac = serverMAC
self.crypto.session.key.server.encryption = serverKey
self.crypto.session.key.server.iv = serverIV
self.crypto.session.key.client.mac = clientMAC
self.crypto.session.key.client.encryption = clientKey
self.crypto.session.key.client.iv = clientIV
#print 'mastersecret', masterSecret.encode('hex')
#print serverMAC.encode('hex'), serverKey.encode('hex'), serverIV.encode('hex')
#print clientMAC.encode('hex'), clientKey.encode('hex'), clientIV.encode('hex')
def rsa_load_key(self, pem):
key=RSA.importKey(pem)
return PKCS1_v1_5.new(key)
def rsa_load_from_file(self, pemfile):
return self.rsa_load_key(open(pemfile,'r').read())
def rsa_load_privkey(self, pem):
self.crypto.server.rsa.privkey=self.rsa_load_key(pem)
return
def tlsciphertext_decrypt(self, p, cryptfunc):
ret = TLSRecord()
ret.content_type, ret.version, ret.length = p[TLSRecord].content_type, p[TLSRecord].version, p[TLSRecord].length
enc_data = p[TLSRecord].payload.load
#if self.packets.client.sequence==0:
# iv = self.crypto.session.key.client.iv
decrypted = cryptfunc.decrypt(enc_data)
plaintext = decrypted[:-self.crypto.session.key.length.mac-1]
mac=decrypted[len(plaintext):]
return ret/TLSCiphertextDecrypted(plaintext)/TLSCiphertextMAC(mac)
def __repr__(self):
params = {'id':id(self),
'params-handshake-client':repr(self.params.handshake.client),
'params-handshake-server':repr(self.params.handshake.server),
'params-negotiated-ciphersuite':self.params.negotiated.ciphersuite,
'params-negotiated-key_exchange':self.params.negotiated.key_exchange,
'params-negotiated-encryption':self.params.negotiated.encryption,
'params-negotiated-mac':self.params.negotiated.mac,
'params-negotiated-compression':self.params.negotiated.compression,
'crypto-client-enc':repr(self.crypto.client.enc),
'crypto-client-dec':repr(self.crypto.client.dec),
'crypto-server-enc':repr(self.crypto.server.enc),
'crypto-server-dec':repr(self.crypto.server.dec),
'crypto-server-rsa-pubkey':repr(self.crypto.server.rsa.pubkey),
'crypto-server-rsa-privkey':repr(self.crypto.server.rsa.privkey),
'crypto-session-encrypted_premaster_secret':repr(self.crypto.session.encrypted_premaster_secret),
'crypto-session-premaster_secret':repr(self.crypto.session.premaster_secret),
'crypto-session-master_secret':repr(self.crypto.session.master_secret),
'crypto-session-randombytes-client':repr(self.crypto.session.randombytes.client),
'crypto-session-randombytes-server':repr(self.crypto.session.randombytes.server),
'crypto-session-key-server-mac':repr(self.crypto.session.key.server.mac),
'crypto-session-key-server-encryption':repr(self.crypto.session.key.server.encryption),
'crypto-session-key-server-iv':repr(self.crypto.session.key.server.iv),
'crypto-session-key-client-mac':repr(self.crypto.session.key.client.mac),
'crypto-session-key-client-encryption':repr(self.crypto.session.key.client.encryption),
'crypto-session-key-client-iv':repr(self.crypto.session.key.client.iv),
'crypto-session-key-length-mac':self.crypto.session.key.length.mac,
'crypto-session-key-length-encryption':self.crypto.session.key.length.encryption,
'crypto-session-key-length-iv':self.crypto.session.key.length.iv,
}
str = "<TLSSessionCtx: id=%(id)s"
str +="\n\t params.handshake.client=%(params-handshake-client)s"
str +="\n\t params.handshake.server=%(params-handshake-server)s"
str +="\n\t params.negotiated.ciphersuite=%(params-negotiated-ciphersuite)s"
str +="\n\t params.negotiated.key_exchange=%(params-negotiated-key_exchange)s"
str +="\n\t params.negotiated.encryption=%(params-negotiated-encryption)s"
str +="\n\t params.negotiated.mac=%(params-negotiated-mac)s"
str +="\n\t params.negotiated.compression=%(params-negotiated-compression)s"
str +="\n\t crypto.client.enc=%(crypto-client-enc)s"
str +="\n\t crypto.client.dec=%(crypto-client-dec)s"
str +="\n\t crypto.server.enc=%(crypto-server-enc)s"
str +="\n\t crypto.server.dec=%(crypto-server-dec)s"
str +="\n\t crypto.server.rsa.privkey=%(crypto-server-rsa-privkey)s"
str +="\n\t crypto.server.rsa.pubkey=%(crypto-server-rsa-pubkey)s"
str +="\n\t crypto.session.encrypted_premaster_secret=%(crypto-session-encrypted_premaster_secret)s"
str +="\n\t crypto.session.premaster_secret=%(crypto-session-premaster_secret)s"
str +="\n\t crypto.session.master_secret=%(crypto-session-master_secret)s"
str +="\n\t crypto.session.randombytes.client=%(crypto-session-randombytes-client)s"
str +="\n\t crypto.session.randombytes.server=%(crypto-session-randombytes-server)s"
str +="\n\t crypto.session.key.client.mac=%(crypto-session-key-client-mac)s"
str +="\n\t crypto.session.key.client.encryption=%(crypto-session-key-client-encryption)s"
str +="\n\t crypto.session.key.cllient.iv=%(crypto-session-key-client-iv)s"
str +="\n\t crypto.session.key.server.mac=%(crypto-session-key-server-mac)s"
str +="\n\t crypto.session.key.server.encryption=%(crypto-session-key-server-encryption)s"
str +="\n\t crypto.session.key.server.iv=%(crypto-session-key-server-iv)s"
str +="\n\t crypto.session.key.length.mac=%(crypto-session-key-length-mac)s"
str +="\n\t crypto.session.key.length.encryption=%(crypto-session-key-length-encryption)s"
str +="\n\t crypto.session.key.length.iv=%(crypto-session-key-length-iv)s"
str += "\n>"
return str%params