pyp0f

Native implementation of p0f v3 in typed Python 3.

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Documentation: https://github.com/Nisitay/pyp0f/blob/master/docs/README.md

Source Code: https://github.com/Nisitay/pyp0f

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pyp0f is able to accurately guess the source OS or user application of a given packet with passive fingerprinting, as well as impersonate packets so that p0f will think it has been sent by a specific OS.

Motivation

• pyp0f is platform independent (using Scapy), while p0f can be cumbersome to run on some platforms (such as Windows).
• The implementation and concepts behind p0f are very sophisticated, but the tool is written in C which makes it harder to understand and extend. Performance is expected to be slower in Python, but pyp0f still performs well enough (see Performance benchmarks)
• p0f heavily depends on full packet flow details, while pyp0f attempts to use as little information as possible. For example, you may be able to fingerprint a SYN+ACK packet from a session without having the matching SYN packet.
• pyp0f aims to be highly configurable and used as a library, without limiting its effectiveness to one packet format/library, as opposed to p0f which runs on a seperate process and you query the results using an API.

Installation

$ pip install pyp0f

Features

• Full p0f fingerprinting (MTU, TCP, HTTP)
• p0f spoofing - impersonation (MTU, TCP)
• TCP timestamps uptime detection

In Progress

• Flow tracking
• NAT detection

Getting Started

from scapy.layers.inet import IP, TCP
from pyp0f.database import DATABASE
from pyp0f.fingerprint import fingerprint_mtu, fingerprint_tcp, fingerprint_http
from pyp0f.fingerprint.results import MTUResult, TCPResult, HTTPResult

DATABASE.load()  # Load the fingerprints database

# MTU Fingerprinting
google_packet = IP() / TCP(options=[("MSS", 1430)])
mtu_result: MTUResult = fingerprint_mtu(google_packet)

# TCP Fingerprinting
linux_packet = IP(tos=0x10, flags=0x02, ttl=58) / TCP(
    seq=1,
    window=29200,
    options=[("MSS", 1460), ("SAckOK", b""), ("Timestamp", (177816630, 0)), ("NOP", None), ("WScale", 7)],
)
tcp_result: TCPResult = fingerprint_tcp(linux_packet)

# HTTP Fingerprinting
apache_payload = b"HTTP/1.1 200 OK\r\nDate: Fri, 10 Jun 2011 13:27:01 GMT\r\nServer: Apache\r\nLast-Modified: Thu, 09 Jun 2011 17:25:43 GMT\r\nExpires: Mon, 13 Jun 2011 17:25:43 GMT\r\nETag: 963D6BC0ED128283945AF1FB57899C9F3ABF50B3\r\nCache-Control: max-age=272921,public,no-transform,must-revalidate\r\nContent-Length: 491\r\nConnection: close\r\nContent-Type: application/ocsp-response\r\n\r\n"
http_result: HTTPResult = fingerprint_http(apache_payload)

Sources

• p0f source code
• Scapy docs & source code

Authors

• Itay Margolin - Nisitay