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HTTP.py
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HTTP.py
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#! /usr/bin/env python
# -*- coding: UTF-8 -*-
# Author : Steeve Barbeau, Luca Invernizzi
import re
from scapy.all import TCP, bind_layers, Packet, StrField
def _canonicalize_header(name):
''' Takes a header key (i.e., "Host" in "Host: www.google.com",
and returns a canonical representation of it '''
return name.strip().lower()
def _parse_headers(s):
''' Takes a HTTP packet, and returns a tuple containing:
- the first line (e.g., "GET ...")
- the headers in a dictionary
- the body '''
try:
headers, body = s.split("\r\n\r\n", 1)
except:
headers = s
body = ''
headers = headers.split("\r\n")
first_line, headers = headers[0].strip(), headers[1:]
headers_found = {}
for header_line in headers:
try:
key, value = header_line.split(':', 1)
except:
continue
headers_found[_canonicalize_header(key)] = header_line.strip()
return first_line, headers_found, body
def _dissect_headers(obj, s):
''' Takes a HTTP packet as the string s, and populates the scapy layer obj
(either HTTPResponse or HTTPRequest). Returns the first line of the
HTTP packet, and the body
'''
first_line, headers, body = _parse_headers(s)
for f in obj.fields_desc:
canonical_name = _canonicalize_header(f.name)
try:
header_line = headers[canonical_name]
except:
continue
key, value = header_line.split(':', 1)
obj.setfieldval(f.name, value.strip())
del headers[canonical_name]
if headers:
obj.setfieldval(
'Additional-Headers', '\r\n'.join(headers.values()) + '\r\n')
return first_line, body
def _self_build(obj, field_pos_list=None):
''' Takse an HTTPRequest or HTTPResponse object, and creates its internal
scapy representation as a string. That is, generates the HTTP
packet as a string '''
p = ""
for f in obj.fields_desc:
val = obj.getfieldval(f.name)
if not val:
continue
val += '\r\n'
if f.name in ['Method', 'Additional-Headers', 'Status-Line']:
p = f.addfield(obj, p, val)
else:
p = f.addfield(obj, p, "%s: %s" % (f.name, val))
return p
class HTTPRequest(Packet):
name = "HTTP Request"
http_methods = "^(OPTIONS|GET|HEAD|POST|PUT|DELETE|TRACE|CONNECT)"
fields_desc = [StrField("Method", None, fmt="H"),
StrField("Host", None, fmt="H"),
StrField("User-Agent", None, fmt="H"),
StrField("Accept", None, fmt="H"),
StrField("Accept-Language", None, fmt="H"),
StrField("Accept-Encoding", None, fmt="H"),
StrField("Accept-Charset", None, fmt="H"),
StrField("Referer", None, fmt="H"),
StrField("Authorization", None, fmt="H"),
StrField("Expect", None, fmt="H"),
StrField("From", None, fmt="H"),
StrField("If-Match", None, fmt="H"),
StrField("If-Modified-Since", None, fmt="H"),
StrField("If-None-Match", None, fmt="H"),
StrField("If-Range", None, fmt="H"),
StrField("If-Unmodified-Since", None, fmt="H"),
StrField("Max-Forwards", None, fmt="H"),
StrField("Proxy-Authorization", None, fmt="H"),
StrField("Range", None, fmt="H"),
StrField("TE", None, fmt="H"),
StrField("Cache-Control", None, fmt="H"),
StrField("Connection", None, fmt="H"),
StrField("Date", None, fmt="H"),
StrField("Pragma", None, fmt="H"),
StrField("Trailer", None, fmt="H"),
StrField("Transfer-Encoding", None, fmt="H"),
StrField("Upgrade", None, fmt="H"),
StrField("Via", None, fmt="H"),
StrField("Warning", None, fmt="H"),
StrField("Keep-Alive", None, fmt="H"),
StrField("Allow", None, fmt="H"),
StrField("Content-Encoding", None, fmt="H"),
StrField("Content-Language", None, fmt="H"),
StrField("Content-Length", None, fmt="H"),
StrField("Content-Location", None, fmt="H"),
StrField("Content-MD5", None, fmt="H"),
StrField("Content-Range", None, fmt="H"),
StrField("Content-Type", None, fmt="H"),
StrField("Expires", None, fmt="H"),
StrField("Last-Modified", None, fmt="H"),
StrField("Cookie", None, fmt="H"),
StrField("Additional-Headers", None, fmt="H")]
def do_dissect(self, s):
''' From the HTTP packet string, populate the scapy object '''
first_line, body = _dissect_headers(self, s)
self.setfieldval('Method', first_line)
return body
def self_build(self, field_pos_list=None):
''' Generate the HTTP packet string (the oppposite of do_dissect) '''
return _self_build(self, field_pos_list)
class HTTPResponse(Packet):
name = "HTTP Response"
fields_desc = [StrField("Status-Line", None, fmt="H"),
StrField("Accept-Ranges", None, fmt="H"),
StrField("Age", None, fmt="H"),
StrField("E-Tag", None, fmt="H"),
StrField("Location", None, fmt="H"),
StrField("Proxy-Authenticate", None, fmt="H"),
StrField("Retry-After", None, fmt="H"),
StrField("Server", None, fmt="H"),
StrField("Vary", None, fmt="H"),
StrField("WWW-Authenticate", None, fmt="H"),
StrField("Cache-Control", None, fmt="H"),
StrField("Connection", None, fmt="H"),
StrField("Date", None, fmt="H"),
StrField("Pragma", None, fmt="H"),
StrField("Trailer", None, fmt="H"),
StrField("Transfer-Encoding", None, fmt="H"),
StrField("Upgrade", None, fmt="H"),
StrField("Via", None, fmt="H"),
StrField("Warning", None, fmt="H"),
StrField("Keep-Alive", None, fmt="H"),
StrField("Allow", None, fmt="H"),
StrField("Content-Encoding", None, fmt="H"),
StrField("Content-Language", None, fmt="H"),
StrField("Content-Length", None, fmt="H"),
StrField("Content-Location", None, fmt="H"),
StrField("Content-MD5", None, fmt="H"),
StrField("Content-Range", None, fmt="H"),
StrField("Content-Type", None, fmt="H"),
StrField("Expires", None, fmt="H"),
StrField("Last-Modified", None, fmt="H"),
StrField("Additional-Headers", None, fmt="H")]
def do_dissect(self, s):
''' From the HTTP packet string, populate the scapy object '''
first_line, body = _dissect_headers(self, s)
self.setfieldval('Status-Line', first_line)
return body
def self_build(self, field_pos_list=None):
''' From the HTTP packet string, populate the scapy object '''
return _self_build(self, field_pos_list)
class HTTP(Packet):
name = "HTTP"
def do_dissect(self, s):
return s
def guess_payload_class(self, payload):
''' Decides if the payload is an HTTP Request or Response, or
something else '''
prog = re.compile("^(OPTIONS|GET|HEAD|POST|PUT|DELETE|TRACE|CONNECT)")
result = prog.search(payload)
if result:
return HTTPRequest
else:
prog = re.compile("^HTTP/((0\.9)|(1\.0)|(1\.1))\ [0-9]{3}.*")
result = prog.search(payload)
if result:
return HTTPResponse
return Packet.guess_payload_class(self, payload)
bind_layers(TCP, HTTP)