python dpkt解析ssl流
作者:互联网
用法:python extract_tls_flow.py -vr white_pcap/11/2018-01-10_13-05-09_2.pcap -o pcap_ssl_flow.txt >log.txt
python dpkt解析ssl流,记录含有client hello到app data的完整ssl 流,同时记录ssl证书:
#!/usr/bin/env python from __future__ import absolute_import from __future__ import print_function import argparse from binascii import hexlify import socket import struct import json import sys import textwrap import dpkt from constants import PRETTY_NAMES from asn1crypto import x509 global streambuffer streambuffer = {} global encrypted_streams encrypted_streams = [] # change_cipher global ssl_servers_certs ssl_servers_certs = {} global ssl_servers_with_handshake ssl_servers_with_handshake = set() global client_hello_set client_hello_set = set() global ssl_flows ssl_flows = [] global buffer buffer = {} need_more_parse = False class FlowDirection(object): OUT = 1 IN = 2 UNKNOWN = 3 class Extension(object): """ Encapsulates TLS extensions. """ def __init__(self, payload): self._type_id, payload = unpacker('H', payload) self._type_name = pretty_name('extension_type', self._type_id) self._length, payload = unpacker('H', payload) # Data contains an array with the 'raw' contents self._data = None # pretty_data contains an array with the 'beautified' contents self._pretty_data = None if self._length > 0: self._data, self._pretty_data = parse_extension(payload[:self._length], self._type_name) def __str__(self): # Prints out data array in textual format return '{0}: {1}'.format(self._type_name, self._pretty_data) def analyze_packet(_timestamp, packet, nth): """ Main analysis loop for pcap. """ eth = dpkt.ethernet.Ethernet(packet) if isinstance(eth.data, dpkt.ip.IP): #print("timestamp:", _timestamp, "debug") parse_ip_packet(eth.data, nth, _timestamp) def parse_arguments(): """ Parses command line arguments. """ global filename global verboseprint global output_file parser = argparse.ArgumentParser( formatter_class=argparse.RawDescriptionHelpFormatter, description=textwrap.dedent('''\ Captures, parses and shows TLS Handshake packets Copyright (C) 2015 Peter Mosmans [Go Forward] This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.''')) parser.add_argument('-r', '--read', metavar='FILE', action='store', help='read from file (don\'t capture live packets)') parser.add_argument('-v', '--verbose', action='store_true', help='increase output verbosity') parser.add_argument('-o', '--output', action='store', help='output file') args = parser.parse_args() if args.verbose: def verboseprint(*args): print('# ', end="") for arg in args: print(arg, end="") print() else: verboseprint = lambda *a: None filename = None if args.read: filename = args.read output_file = "demo_output.txt" if args.output: output_file = args.output def parse_ip_packet(ip, nth, timestamp): """ Parses IP packet. """ sys.stdout.flush() if isinstance(ip.data, dpkt.tcp.TCP) and len(ip.data.data): # print("****TCP packet found****", "tcp payload:", list(ip.data.data)) parse_tcp_packet(ip, nth, timestamp) def parse_tcp_packet(ip, nth, timestamp): """ Parses TCP packet. """ stream = ip.data.data """ refer: The Transport Layer Security (TLS) Protocol URL:https://tools.ietf.org/html/rfc5246 enum { change_cipher_spec(20), alert(21), handshake(22), application_data(23), (255) } ContentType; """ # ssl flow if (stream[0]) in {20, 21, 22, 23}: if (stream[0]) in {20, 21, 22}: parse_tls_records(ip, stream, nth) else: connection = '{0}:{1}-{2}:{3}'.format(socket.inet_ntoa(ip.src), ip.data.sport, socket.inet_ntoa(ip.dst), ip.data.dport) print("*"*99) print("23 SSL application data:{} 10 sample:{} nth:{}".format(connection, list(stream[:10]), nth)) # buffer record recent ssl flow from handshake to app data TODO precise description record_recent_data_flow(ip, stream, nth, timestamp) def has_application_data(flow_list): for flow in flow_list: if flow[0] == 23: return True return False def record_recent_data_flow(ip, stream, nth, timestamp): global buffer src_ip = '{0}:{1}'.format(socket.inet_ntoa(ip.src), ip.data.sport) dst_ip = '{0}:{1}'.format(socket.inet_ntoa(ip.dst), ip.data.dport) flow_dir = FlowDirection.UNKNOWN connection_key = "" # identify flow direction if dst_ip in ssl_servers_with_handshake: # OUT flow flow_dir = FlowDirection.OUT connection_key = "{}-{}".format(src_ip, dst_ip) elif src_ip in ssl_servers_with_handshake: # IN flow flow_dir = FlowDirection.IN connection_key = "{}-{}".format(dst_ip, src_ip) else: print("Warning: not find in ssl_servers_with_handshake! src_ip:{} dst_ip:{}".format(src_ip, dst_ip)) print("dump this NOT useful data!!! 10:", list(stream[:10]), "nth:", nth) return if connection_key in buffer: # buffer has only data with client hello if flow_dir == FlowDirection.OUT: buffer[connection_key]["out"].append((stream[0], nth, timestamp, list(stream))) elif flow_dir == FlowDirection.IN: buffer[connection_key]["in"].append((stream[0], nth, timestamp, list(stream))) else: print("Warning: not find client hello. src_ip:{} dst_ip:{}".format(src_ip, dst_ip)) print("dump this NOT useful data!!! 10:", list(stream[:10]), "nth:", nth) def add_to_complete_ssl_flow(connection_key, buffer): # We want SSL flow data from ***ClientHello*** to ***AppData*** global ssl_flows assert connection_key in client_hello_set server = connection_key.split("-")[1] assert server in ssl_servers_with_handshake print("**** add to wanted flow *** {}".format(connection_key)) ssl_flows.append({"connection": connection_key, "payload": dict(buffer[connection_key]), "certs": list(ssl_servers_certs[server]) if server in ssl_servers_certs else []}) def add_to_buffer(ip, partial_stream): """ Adds partial_stream of ip to global stream buffer. """ global streambuffer connection = '{0}:{1}-{2}:{3}'.format(socket.inet_ntoa(ip.src), ip.data.sport, socket.inet_ntoa(ip.dst), ip.data.dport) streambuffer[connection] = partial_stream verboseprint('Added {0} bytes (seq {1}) to streambuffer for {2}'. format(len(partial_stream), ip.data.seq, connection)) def parse_tls_records(ip, stream, nth): """ Parses TLS Records. """ print("*"*99) print("20 21 22 SSL tcp payload(10):", list(stream[:10]), "nth:", nth) #print("SSL tcp payload:", list(stream)) try: records, bytes_used = dpkt.ssl.tls_multi_factory(stream) except dpkt.ssl.SSL3Exception as exception: verboseprint('exception while parsing TLS records: {0}'. format(exception)) return connection = '{0}:{1}-{2}:{3}'.format(socket.inet_ntoa(ip.src), ip.data.sport, socket.inet_ntoa(ip.dst), ip.data.dport) global encrypted_streams if bytes_used != len(stream): add_to_buffer(ip, stream[bytes_used:]) if len(records) > 1: print("SSL stream has many({}) records!".format(len(records))) for record in records: record_type = pretty_name('tls_record', record.type) print('captured TLS record type {0}'.format(record_type)) if record_type == 'handshake': parse_tls_handshake(ip, record.data) if record_type == 'alert': parse_alert_message(connection, record.data) # The change cipher spec protocol is used to change the encryption being used by the client and server. It is normally used as part of the handshake process to switch to symmetric key encryption. The CCS protocol is a single message that tells the peer that the sender wants to change to a new set of keys, which are then created from information exchanged by the handshake protocol. if record_type == 'change_cipher': # Since the Change Cipher Spec message modifies encryption settings, a new record should begin immediately afterwards, so that the new settings are immediately applied (in particular, it is crucial for security that the Finished message uses the new encryption and MAC). print('[+] Change cipher - encrypted messages from now on for {0}'.format(connection)) encrypted_streams.append(connection) sys.stdout.flush() def parse_tls_handshake(ip, data): """ Parses TLS Handshake message contained in data according to their type. """ connection = '{0}:{1}-{2}:{3}'.format(socket.inet_ntoa(ip.src), ip.data.sport, socket.inet_ntoa(ip.dst), ip.data.dport) global encrypted_streams if connection in encrypted_streams: print("*** MUST have cipher change flow first!!! ***") print('[+] Encrypted handshake message between {0}'.format(connection)) return else: try: handshake_type = ord(data[:1]) verboseprint('First 10 bytes {0}'. format(hexlify(data[:10]))) if handshake_type == 4: print('[#] New Session Ticket is not implemented yet') return else: handshake = dpkt.ssl.TLSHandshake(data) except dpkt.ssl.SSL3Exception as exception: verboseprint('exception while parsing TLS handshake record: {0}'. format(exception)) return except dpkt.dpkt.NeedData as exception: verboseprint('exception while parsing TLS handshake record: {0}'. format(exception)) return # ******** client is source IP, server is destination IP ******* client = '{0}:{1}'.format(socket.inet_ntoa(ip.src), ip.data.sport) server = '{0}:{1}'.format(socket.inet_ntoa(ip.dst), ip.data.dport) if handshake.type == 0: ssl_servers_with_handshake.add(server) print('<- Hello Request {0} <- {1}'.format(client, server)) if handshake.type == 1: ssl_servers_with_handshake.add(server) global client_hello_set global buffer connection = "{}-{}".format(client, server) if connection in client_hello_set: print("#"*99) print("Client Hello found again! {}, I will check if there is application flow data and add into wanted data!".format(connection)) if has_application_data(buffer[connection]["out"]) or has_application_data(buffer[connection]["in"]): # has already trans data before and a new flow come # record previous SSL data flow add_to_complete_ssl_flow(connection, buffer) else: client_hello_set.add(connection) print(' -> ClientHello {0} -> {1}'.format(client, server)) # init buffer buffer[connection] = {"out":[], "in":[]} if need_more_parse: parse_client_hello(handshake) if handshake.type == 2: ssl_servers_with_handshake.add(client) print('<- ServerHello {1} <- {0}'.format(client, server)) if need_more_parse: parse_server_hello(handshake.data) if handshake.type == 11: # TLSCertificate ssl_servers_with_handshake.add(server) print('<- Certificate {0} <- {1}'.format(client, server)) hd_data = handshake.data assert isinstance(hd_data, dpkt.ssl.TLSCertificate) certs = [] #print(dir(hd)) for i in range(len(hd_data.certificates)): print("hd.certificates[i]:", hd_data.certificates[i]) cert = x509.Certificate.load(hd_data.certificates[i]) sha = cert.sha256_fingerprint.replace(" ", "") print(sha) certs.append(sha) ssl_servers_certs[server] = certs print("*"*66) print("certs all here:", certs) if handshake.type == 12: ssl_servers_with_handshake.add(client) print('<- ServerKeyExchange {1} <- {0}'.format(server, client)) if handshake.type == 13: ssl_servers_with_handshake.add(client) print('<- CertificateRequest {1} <- {0}'.format(client, server)) if handshake.type == 14: ssl_servers_with_handshake.add(client) print('<- ServerHelloDone {1} <- {0}'.format(client, server)) if handshake.type == 15: ssl_servers_with_handshake.add(server) print(' -> CertificateVerify {0} -> {1}'.format(client, server)) if handshake.type == 16: ssl_servers_with_handshake.add(server) print(' -> ClientKeyExchange {0} -> {1}'.format(client, server)) if handshake.type == 20: ssl_servers_with_handshake.add(server) print(' -> Finished {0} -> {1}'.format(client, server)) def unpacker(type_string, packet): """ Returns network-order parsed data and the packet minus the parsed data. """ if type_string.endswith('H'): length = 2 if type_string.endswith('B'): length = 1 if type_string.endswith('P'): # 2 bytes for the length of the string length, packet = unpacker('H', packet) type_string = '{0}s'.format(length) if type_string.endswith('p'): # 1 byte for the length of the string length, packet = unpacker('B', packet) type_string = '{0}s'.format(length) data = struct.unpack('!' + type_string, packet[:length])[0] if type_string.endswith('s'): #data = ''.join(data) data = data return data, packet[length:] def parse_server_hello(handshake): """ Parses server hello handshake. """ payload = handshake.data session_id, payload = unpacker('p', payload) cipher_suite, payload = unpacker('H', payload) print('[*] Cipher: {0}'.format(pretty_name('cipher_suites', cipher_suite))) compression, payload = unpacker('B', payload) print('[*] Compression: {0}'.format(pretty_name('compression_methods', compression))) extensions = parse_extensions(payload) for extension in extensions: print(' {0}'.format(extension)) def parse_client_hello(handshake): hello = handshake.data compressions = [] cipher_suites = [] extensions = [] payload = handshake.data.data session_id, payload = unpacker('p', payload) cipher_suites, pretty_cipher_suites = parse_extension(payload, 'cipher_suites') verboseprint('TLS Record Layer Length: {0}'.format(len(handshake))) verboseprint('Client Hello Version: {0}'.format(dpkt.ssl.ssl3_versions_str[hello.version])) verboseprint('Client Hello Length: {0}'.format(len(hello))) verboseprint('Session ID: {0}'.format(hexlify(session_id))) print('[*] Ciphers: {0}'.format(pretty_cipher_suites)) # consume 2 bytes for each cipher suite plus 2 length bytes payload = payload[(len(cipher_suites) * 2) + 2:] compressions, pretty_compressions = parse_extension(payload, 'compression_methods') print('[*] Compression methods: {0}'.format(pretty_compressions)) # consume 1 byte for each compression method plus 1 length byte payload = payload[len(compressions) + 1:] extensions = parse_extensions(payload) for extension in extensions: print(' {0}'.format(extension)) def parse_extensions(payload): """ Parse data as one or more TLS extensions. """ extensions = [] #print("payload:", payload) if len(payload) <= 0: return [] print('[*] Extensions:') extensions_len, payload = unpacker('H', payload) verboseprint('Extensions Length: {0}'.format(extensions_len)) while len(payload) > 0: extension = Extension(payload) extensions.append(extension) # consume 2 bytes for type and 2 bytes for length payload = payload[extension._length + 4:] return extensions def parse_alert_message(connection, payload): """ Parses a TLS alert message. """ global encrypted_streams verboseprint(hexlify(payload)) if connection in encrypted_streams: print('[+] Encrypted TLS Alert message between {0}'.format(connection)) # presume the alert message ended the encryption encrypted_streams.remove(connection) else: alert_level, payload = unpacker('B', payload) alert_description, payload = unpacker('B', payload) print('[+] TLS Alert message between {0}: {1} {2}'. format(connection, pretty_name('alert_level', alert_level), pretty_name('alert_description', alert_description))) def parse_extension(payload, type_name): """ Parses an extension based on the type_name. Returns an array of raw values as well as an array of prettified values. """ entries = [] pretty_entries = [] format_list_length = 'H' format_entry = 'B' list_length = 0 if type_name == 'elliptic_curves': format_list_length = 'H' format_entry = 'H' if type_name == 'ec_point_formats': format_list_length = 'B' if type_name == 'compression_methods': format_list_length = 'B' format_entry = 'B' if type_name == 'heartbeat': format_list_length = 'B' format_entry = 'B' if type_name == 'next_protocol_negotiation': format_entry = 'p' else: if len(payload) > 1: # contents are a list list_length, payload = unpacker(format_list_length, payload) verboseprint('type {0}, list type is {1}, number of entries is {2}'. format(type_name, format_list_length, list_length)) if type_name == 'status_request' or type_name == 'status_request_v2': _type, payload = unpacker('B', payload) format_entry = 'H' if type_name == 'padding': return payload, hexlify(payload) if type_name == 'SessionTicket_TLS': return payload, hexlify(payload) if type_name == 'cipher_suites': format_entry = 'H' if type_name == 'supported_groups': format_entry = 'H' if type_name == 'signature_algorithms': format_entry = 'H' if type_name == 'cipher_suites': format_entry = 'H' if list_length: payload = payload[:list_length] while (len(payload) > 0): if type_name == 'server_name': _type, payload = unpacker('B', payload) format_entry = 'P' if type_name == 'application_layer_protocol_negotiation': format_entry = 'p' entry, payload = unpacker(format_entry, payload) entries.append(entry) if type_name == 'signature_algorithms': pretty_entries.append('{0}-{1}'. format(pretty_name ('signature_algorithms_hash', entry >> 8), pretty_name('signature_algorithms_signature', entry % 256))) else: if format_entry.lower() == 'p': pretty_entries.append(entry) else: pretty_entries.append(pretty_name(type_name, entry)) return entries, pretty_entries def pretty_name(name_type, name_value): """Returns the pretty name for type name_type.""" if name_type in PRETTY_NAMES: if name_value in PRETTY_NAMES[name_type]: name_value = PRETTY_NAMES[name_type][name_value] else: name_value = '{0}: unknown value {1}'.format(name_value, name_type) else: name_value = 'unknown type: {0}'.format(name_type) return name_value def main(): """ Main program loop. """ global cap_filter global interface parse_arguments() if filename: read_file(filename) def process_left_buffer(): print("********process_left_buffer********") global buffer for connection_key in buffer: if has_application_data(buffer[connection_key]["out"]) or has_application_data(buffer[connection_key]["in"]): # record previous SSL data flow add_to_complete_ssl_flow(connection_key, buffer) else: print("Bad flow found, has no data but ssl handshake!", buffer[connection_key]) def read_file(filename): try: with open(filename, 'rb') as f: capture = dpkt.pcap.Reader(f) # packets = [(timestamp, packet) for timestamp, packet in capture] # packets.sort(key=lambda x:x[0]) t1 = 0 i = 1 for timestamp, packet in capture: analyze_packet(timestamp, packet, i) print(i, timestamp) if timestamp < t1: print("???error???") i += 1 t1 = timestamp process_left_buffer() print("*"*99) print("ssl flow wanted here!!!") print("*"*99) global output_file with open(output_file, "w") as f: json.dump([flow for flow in ssl_flows if flow["certs"]], f) cnt = 0 for flow in ssl_flows: if flow["certs"]: cnt += 1 print("connection:", flow["connection"]) print("payload out:", [(tag, nth, timestamp, payload[:10]) for tag, nth, timestamp, payload in flow["payload"]["out"]]) print("payload in:", [(tag, nth, timestamp, payload[:10]) for tag, nth, timestamp, payload in flow["payload"]["in"]]) print("certs:", flow["certs"]) print("*"*99) print("total flow:", cnt) f.close() except IOError: print('could not parse {0}'.format(filename)) if __name__ == "__main__": main()
标签:name,format,python,type,dpkt,ssl,ip,data,payload 来源: https://www.cnblogs.com/bonelee/p/10409176.html