/
wafbypasser.py
executable file
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/
wafbypasser.py
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#!/bin/python
from tornado.httputil import HTTPHeaders
from tornado.httpclient import HTTPRequest
from core.hpp_lib import asp_hpp, param_overwrite
from core.placeholder_length import find_length
from core.detection import *
from core.argument_parser import get_args
from core.fuzzer import Fuzzer
from core.helper import load_payload_file, Error
from core.http_helper import HTTPHelper
from core.param_source_detector import detect_accepted_sources
from core.response_analyzer import analyze_responses, print_request, \
print_response, analyze_chars, analyze_encoded_chars, \
analyze_accepted_sources
from core.placeholder_manager import PlaceholderManager
from core.obfuscation_lib import unicode_urlencode, urlencode, \
transformations_info
import string
class WAFBypasser:
def fuzz(self, args, requests):
if args["follow_cookies"] or args["delay"]:
delay = args["delay"] or 0
follow_cookies = args["follow_cookies"] or False
print "Synchronous Fuzzing: Started"
responses = self.fuzzer.sync_fuzz(requests, delay, follow_cookies)
else:
print "Requests number: " + str(len(requests))
print "Asynchronous Fuzzing: Started"
responses = self.fuzzer.async_fuzz(requests)
print "Fuzzing: Completed"
print
return responses
def is_detection_set(self, args):
det_functions = ["contains", "resp_code_det", "response_time"]
args_set = False
for name in det_functions:
if args[name] is not None:
return
Error("You need to specify at least one Detection Function.")
def require(self, args, params):
param_missing = False
for param in params:
if args[param] is None:
param_missing = True
print "Specify: --" + param
if param_missing:
Error("Missing Parameter(s).")
def __init__(self):
self.ua = "Mozilla/5.0 (X11; Linux i686; rv:6.0) Gecko/20100101 /" \
"Firefox/15.0"
self.init_request = HTTPRequest("",
auth_username=None,
auth_password=None,
follow_redirects=True,
max_redirects=10,
allow_nonstandard_methods=True,
headers=None,
proxy_host=None,
proxy_port=None,
proxy_username=None,
proxy_password=None,
user_agent=self.ua,
request_timeout=40.0)
self.sig = "@@@"
self.length_signature = self.sig + "length" + self.sig
self.fsig = self.sig + "fuzzhere" + self.sig # fuzzing signature
# Template signature regular expression
self.template_signature_re = self.sig + "[^" + self.sig + "]+"
self.template_signature_re += self.sig
self.detection_struct = []
self.pm = None # PlaceholderManager
self.http_helper = None
self.fuzzer = None
def init_methods(self, args):
methods = args["methods"] or []
# Setting Methods
if methods:
if self.sig + "all" + self.sig in methods:
methods.remove(self.sig + "all" + self.sig)
methods.extend(
load_payload_file("./payloads/HTTP/methods.txt"))
methods = list(set(methods)) # Removing doublesk
else:
if args["data"] is None:
methods.append("GET") # Autodetect Method
else:
methods.append("POST") # Autodetect Method
return methods
def init_headers(self, args):
headers = HTTPHeaders()
if args["headers"]:
for header in args["headers"]:
values = header.split(':', 1)
if len(values) == 2:
headers.add(*values)
else: # values == 1
headers.add(values[0], "")
# Setting Cookies
if args["cookie"]:
headers.add("Cookie", args["cookie"])
return headers
def init_detection_struct(self, args):
if args["contains"]:
detection_args = {}
detection_args["phrase"] = args["contains"][0] # detection string
detection_args["case_sensitive"] = "cs" in args["contains"][1:]
detection_args["reverse"] = False
if args["reverse"]:
detection_args["reverse"] = True
self.detection_struct.append({"method": contains,
"arguments": detection_args,
"info": "Contains"})
if args["resp_code_det"]:
detection_args = {}
detection_args["response_codes"] = args["resp_code_det"][0]
detection_args["reverse"] = False
if args["reverse"]:
detection_args["reverse"] = True
self.detection_struct.append({"method": resp_code_detection,
"arguments": detection_args,
"info": "Response code detection"})
if args["response_time"]:
detection_args = {}
detection_args["time"] = args["response_time"][0]
detection_args["reverse"] = False
if args["reverse"]:
detection_args["reverse"] = True
self.detection_struct.append({"method": resp_time_detection,
"arguments": detection_args,
"info": "Response time detection"})
def start(self, args):
# Initializations
self.sig = args["fuzzing_signature"] or self.sig
self.pm = PlaceholderManager(self.sig)
target = args["target"]
methods = self.init_methods(args)
headers = self.init_headers(args)
data = args["data"] or ""
self.init_detection_struct(args)
self.init_request.headers = headers
self.http_helper = HTTPHelper(self.init_request)
self.fuzzer = Fuzzer(self.http_helper)
# Finding the length of a placeholder
if args["mode"] == "length":
self.require(args, ["accepted_value"])
self.is_detection_set(args)
if len(methods) > 1:
Error("Only you need to specify only one Method")
print "Scanning mode: Length Detection"
ch = args["accepted_value"][0]
length = find_length(self.http_helper,
self.length_signature,
target,
methods[0],
self.detection_struct,
ch,
headers,
data)
print "Placeholder Allowed Length = " + str(length)
# Detecting Allowed Sources
elif args["mode"] == "detect_accepted_sources":
self.is_detection_set(args)
self.require(args, ["methods",
"param_name",
"accepted_value",
"param_source"])
if len(methods) > 1:
Error("Only you need to specify only one Method")
print "Scanning mode: Allowed Sources Detection"
accepted_method = methods[0]
param_name = args["param_name"]
accepted_value = args["accepted_value"]
param_source = args["param_source"]
requests = detect_accepted_sources(self.http_helper,
target,
data,
headers,
param_name,
param_source,
accepted_value,
accepted_method)
responses = self.fuzz(args, requests)
analyze_accepted_sources(responses, self.detection_struct)
elif args["mode"] == "content_type_tamper":
print "Tampering Content-Type mode"
cnt_types = load_payload_file("./payloads/HTTP/content_types.txt")
new_headers = self.http_helper.add_header_param(
headers,
"Content-Type", self.fsig)
self.pm = PlaceholderManager(self.sig)
requests = self.pm.transformed_http_requests(
self.http_helper,
methods,
target,
cnt_types, # Payloads
new_headers,
data)
responses = self.fuzz(args, requests)
for response in responses:
print "[->]Request"
print_request(response)
print "[<-]Response"
print_response(response)
print
# HPP modes
elif args["mode"] == "asp_hpp" or args["mode"] == "param_overwriting":
self.require(args, ["param_name", "param_source", "payloads"])
param_name = args["param_name"]
param_source = args["param_source"]
self.is_detection_set(args)
payloads = []
for p_file in args["payloads"]:
payloads += load_payload_file(p_file)
if args["mode"] == "asp_hpp":
print "Scanning mode: ASP HPP Parameter Splitting"
requests = asp_hpp(self.http_helper,
methods,
payloads,
param_name,
param_source,
target,
headers,
data)
responses = self.fuzz(args, requests)
elif args["mode"] == "param_overwriting":
requests = param_overwrite(self.http_helper,
param_name,
param_source,
payloads[0],
target,
data,
headers)
responses = self.fuzz(args, requests)
analyze_responses(responses,
self.http_helper,
self.detection_struct)
elif args["mode"] == "detect_chars":
self.is_detection_set(args)
payloads = []
for i in range(0, 256):
payloads.append(chr(i))
requests = self.pm.transformed_http_requests(self.http_helper,
methods,
target,
payloads,
headers,
data)
responses = self.fuzz(args, requests)
sent_payloads = analyze_chars(responses,
self.http_helper,
self.detection_struct)
payloads = []
# urlencode blocked chars
if sent_payloads["detected"]:
print
print "URL encoding detected characters"
for bad_char in sent_payloads["detected"]:
payloads.append(urlencode(bad_char))
requests = self.pm.transformed_http_requests(self.http_helper,
methods,
target,
payloads,
headers,
data)
responses = self.fuzz(args, requests)
analyze_encoded_chars(responses,
self.http_helper,
self.detection_struct)
print
print "UnicodeURL encoding detected characters"
payloads = []
# unicode urlencode blocked chars
for bad_char in sent_payloads["detected"]:
payloads.append(unicode_urlencode(bad_char))
requests = self.pm.transformed_http_requests(self.http_helper,
methods,
target,
payloads,
headers,
data)
responses = self.fuzz(args, requests)
analyze_encoded_chars(responses,
self.http_helper,
self.detection_struct)
# Finding a white-listed character
good_char = None
for char in string.letters:
good_char = char
break
if not good_char:
for char in string.digits:
good_char = char
break
if not good_char:
good_char = sent_payloads["undetected"][0]
print
print "Sending a detected char followed by an undetected"
payloads = []
# add an accepted char before a blocked char
for bad_char in sent_payloads["detected"]:
payloads.append(bad_char + good_char)
requests = self.pm.transformed_http_requests(self.http_helper,
methods,
target,
payloads,
headers,
data)
responses = self.fuzz(args, requests)
analyze_encoded_chars(responses,
self.http_helper,
self.detection_struct)
print
print "Sending a detected char after an undetected"
payloads = []
for bad_char in sent_payloads["detected"]:
payloads.append(good_char + bad_char)
requests = self.pm.transformed_http_requests(self.http_helper,
methods,
target,
payloads,
headers,
data)
responses = self.fuzz(args, requests)
analyze_encoded_chars(responses,
self.http_helper,
self.detection_struct)
print "Sending an undetected char after a detected"
payloads = []
for bad_char in sent_payloads["detected"]:
payloads.append(bad_char + good_char)
requests = self.pm.transformed_http_requests(self.http_helper,
methods,
target,
payloads,
headers,
data)
responses = self.fuzz(args, requests)
analyze_encoded_chars(responses,
self.http_helper,
self.detection_struct)
print "Sending an detected char surrounded by undetected chars"
payloads = []
for bad_char in sent_payloads["detected"]:
payloads.append(good_char + bad_char + good_char)
requests = self.pm.transformed_http_requests(self.http_helper,
methods,
target,
payloads,
headers,
data)
responses = self.fuzz(args, requests)
analyze_encoded_chars(responses,
self.http_helper,
self.detection_struct)
# Fuzzing mode
elif args["mode"] == "fuzz":
fuzzing_placeholders = PlaceholderManager.get_placeholder_number(
self.template_signature_re, str(args))
if fuzzing_placeholders> 1:
Error("Multiple fuzzing placeholder signatures found. "
"Only one fuzzing placeholder is supported.")
elif fuzzing_placeholders == 0:
Error("No fuzzing placeholder signatures found.")
self.is_detection_set(args)
payloads = []
if args["payloads"]:
for p_file in args["payloads"]:
payloads += load_payload_file(p_file)
else:
payloads.append("")
print "Scanning mode: Fuzzing Using placeholders"
requests = self.pm.transformed_http_requests(self.http_helper,
methods,
target,
payloads,
headers,
data)
responses = self.fuzz(args, requests)
analyze_responses(responses,
self.http_helper,
self.detection_struct)
elif args["mode"] == "show_transform_functions":
print transformations_info()
elif args["mode"] == "overchar":
self.require(args, ["payloads", "accepted_value"])
length = int(args["length"][0])
accepted_value = args["accepted_value"][0]
payloads = []
for p_file in args["payloads"]:
payloads += load_payload_file(p_file)
payloads = [(length - len(payload)) * accepted_value + payload
for payload in payloads]
requests = self.pm.transformed_http_requests(self.http_helper,
methods,
target,
payloads,
headers,
data)
responses = self.fuzz(args, requests)
analyze_responses(responses,
self.http_helper,
self.detection_struct)
else:
Error("Unknown bypassing mode.")
if __name__ == "__main__":
wafbypasser = WAFBypasser()
arguments = get_args()
wafbypasser.start(arguments)