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119 lines
4.3 KiB
Python
Executable File
119 lines
4.3 KiB
Python
Executable File
#!/usr/bin/env python3
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import os
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import sys
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import subprocess
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import yaml
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class TlsStreamParser:
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STATE_CONTENT_TYPE = 0
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STATE_VERSION_BYTE0 = 1
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STATE_VERSION_BYTE1 = 2
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STATE_LENGTH_BYTE0 = 3
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STATE_LENGTH_BYTE1 = 4
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STATE_DATA = 5
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TLS_HEADER_SIZE = 5
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def __init__(self):
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self.state = self.STATE_CONTENT_TYPE
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self.current_length = None
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self.current_remaining = None
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def read(self, data):
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record_parts = []
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i = 0
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tls_consumed_bytes = 0
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while i < len(data):
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if self.state == self.STATE_CONTENT_TYPE:
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# TODO: add content type description
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content_type = data[i]
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self.state = self.STATE_VERSION_BYTE0
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i += 1
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tls_consumed_bytes += 1
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elif self.state == self.STATE_VERSION_BYTE0:
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self.state = self.STATE_VERSION_BYTE1
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i += 1
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tls_consumed_bytes += 1
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elif self.state == self.STATE_VERSION_BYTE1:
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self.state = self.STATE_LENGTH_BYTE0
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i += 1
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tls_consumed_bytes += 1
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elif self.state == self.STATE_LENGTH_BYTE0:
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self.current_length = data[i]
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self.state = self.STATE_LENGTH_BYTE1
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i += 1
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tls_consumed_bytes += 1
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elif self.state == self.STATE_LENGTH_BYTE1:
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self.current_length = self.current_length * 256 + data[i]
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self.current_remaining = self.current_length
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self.state = self.STATE_DATA
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i += 1
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tls_consumed_bytes += 1
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elif self.state == self.STATE_DATA:
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consume_data = min(self.current_remaining, len(data) - i)
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self.current_remaining -= consume_data
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i += consume_data
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tls_consumed_bytes += consume_data
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if self.current_remaining == 0:
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record_parts.append(
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(tls_consumed_bytes, self.TLS_HEADER_SIZE + self.current_length))
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tls_consumed_bytes = 0
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self.current_length = None
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self.state = self.STATE_CONTENT_TYPE
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if tls_consumed_bytes:
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if self.current_length is None:
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record_parts.append((tls_consumed_bytes, '?'))
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else:
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record_parts.append(
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(tls_consumed_bytes, self.TLS_HEADER_SIZE + self.current_length))
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return record_parts
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if len(sys.argv) != 3:
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print(f'Usage: {sys.argv[0]} PCAP_FILE STREAM_ID')
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os.exit(1)
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file = sys.argv[1]
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stream_id = sys.argv[2]
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result = subprocess.run(['tshark', '-2', '-r', file, '-q', '-z',
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f'follow,tcp,yaml,{stream_id}'], capture_output=True, check=True, text=True)
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follow_result = yaml.safe_load(result.stdout)
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LOCAL_PEER = 0
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REMOTE_PEER = 1
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assert follow_result['peers'][REMOTE_PEER][
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'port'] == 443, f"assuming the remote peer is the TLS server: {follow_result['peers']}"
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packets = follow_result['packets']
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upload_stream = TlsStreamParser()
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download_stream = TlsStreamParser()
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rtt = packets[1]['timestamp'] - packets[0]['timestamp']
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time_unit = rtt / 2
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local_timestamp_first = packets[0]['timestamp']
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mitm_timestamp_first = local_timestamp_first + rtt / 4
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min_mitm_timestamp_up = packets[0]['timestamp']
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min_mitm_timestamp_down = packets[0]['timestamp']
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for packet in packets:
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local_timestamp = packet['timestamp']
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data = packet['data']
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if packet['peer'] == LOCAL_PEER:
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mitm_timestamp = local_timestamp + time_unit / 2
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mitm_timestamp = max(mitm_timestamp, min_mitm_timestamp_up)
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min_mitm_timestamp_up = mitm_timestamp
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timestamp = (mitm_timestamp - mitm_timestamp_first) / time_unit
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record_parts = upload_stream.read(data)
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print('%.3f' % timestamp, len(data), ','.join(
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f'{i}/{j}' for i, j in record_parts))
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elif packet['peer'] == REMOTE_PEER:
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mitm_timestamp = local_timestamp - time_unit / 2
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mitm_timestamp = max(mitm_timestamp, min_mitm_timestamp_down)
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min_mitm_timestamp_down = mitm_timestamp
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timestamp = (mitm_timestamp - mitm_timestamp_first) / time_unit
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record_parts = download_stream.read(data)
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print('%.3f' % timestamp, -len(data),
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','.join(f'{i}/{j}' for i, j in record_parts))
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