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# -*- coding: utf-8 -*-
# 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 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.
#
# Author: Mauro Soria
import re
from urllib.parse import unquote
from lib.parse.similarity import SimilarityParser
from lib.utils.random import rand_string
from lib.utils.fmt import get_encoding_type
from thirdparty.sqlmap import DynamicContentParser
class Scanner(object):
def __init__(self, requester, calibration=None, suffix=None, prefix=None, tested=None):
self.calibration = calibration
self.suffix = suffix if suffix else ""
self.prefix = prefix if prefix else ""
self.tested = tested
self.requester = requester
self.tester = None
self.response = None
self.dynamic_parser = None
self.redirect_parser = None
self.sign = None
self.setup()
def duplicate(self, response):
if not self.tested:
return
for t in self.tested:
for tester in self.tested[t].values():
if [response.status, response.body, response.redirect] == [
tester.response.status, tester.response.body, tester.response.redirect
]:
return tester
return
"""
Generate wildcard response information containers, this will be
used to compare with other path responses
"""
def setup(self):
first_path = self.prefix + (
self.calibration if self.calibration else rand_string()
) + self.suffix
first_response = self.requester.request(first_path)
self.response = first_response
if self.response.status == 404:
# Using the response status code is enough :-}
return
duplicate = self.duplicate(first_response)
if duplicate:
# Another test had been performed and shows the same response as this
self.ratio = duplicate.ratio
self.dynamic_parser = duplicate.dynamic_parser
self.redirect_parser = duplicate.redirect_parser
self.sign = duplicate.sign
return
second_path = self.prefix + (
self.calibration if self.calibration else rand_string(omit=first_path)
) + self.suffix
second_response = self.requester.request(second_path)
if first_response.redirect and second_response.redirect:
self.generate_redirect_reg_exp(
first_response.redirect, first_path,
second_response.redirect, second_path,
)
# Analyze response bodies
if first_response.body is not None and second_response.body is not None:
self.dynamic_parser = DynamicContentParser(
self.requester, first_path, first_response.body, second_response.body
)
else:
self.dynamic_parser = None
self.ratio = float(
"{0:.2f}".format(self.dynamic_parser.comparisonRatio)
) # Rounding to 2 decimals
# The wildcard response is static
if self.ratio == 1:
pass
# Adjusting ratio based on response length
elif len(first_response) < 100:
self.ratio -= 0.1
elif len(first_response) < 500:
self.ratio -= 0.05
elif len(first_response) < 2000:
self.ratio -= 0.02
else:
self.ratio -= 0.01
"""
If the path is reflected in response, decrease the ratio. Because
the difference between path lengths can reduce the similarity ratio
"""
encoding_type = get_encoding_type(first_response.body)
if first_path in first_response.body.decode(encoding_type):
if len(first_response) < 200:
self.ratio -= 0.15 + 15 / len(first_response)
elif len(first_response) < 800:
self.ratio -= 0.06 + 30 / len(first_response)
elif len(first_response) < 5000:
self.ratio -= 0.03 + 80 / len(first_response)
elif len(first_response) < 20000:
self.ratio -= 0.02 + 200 / len(first_response)
else:
self.ratio -= 0.01
"""
From 2 redirects of wildcard responses, generate a regexp that matches
every wildcard redirect
"""
def generate_redirect_reg_exp(self, first_loc, first_path, second_loc, second_path):
# Use a unique sign to locate where the path gets reflected in the redirect
self.sign = rand_string(n=20)
first_loc = first_loc.replace(first_path, self.sign)
second_loc = second_loc.replace(second_path, self.sign)
self.redirect_parser = SimilarityParser(first_loc, second_loc)
self.redirect_parser.unquote = True
self.redirect_parser.ignorecase = True
# Check if redirect matches the wildcard redirect regex or the response
# has high similarity with wildcard tested at the start
def scan(self, path, response):
if self.response.status == response.status == 404:
return False
if self.response.status != response.status:
return True
if self.redirect_parser and response.redirect:
# Remove DOM (#) amd queries (?) before comparing to reduce false positives
path = path.split("?")[0].split("#")[0]
redirect = response.redirect.split("?")[0].split("#")[0]
path = re.escape(unquote(path))
regex = self.redirect_parser.regex.replace(self.sign, path)
redirect_to_invalid = self.redirect_parser.compare(regex, redirect)
# If redirection doesn't match the rule, mark as found
if not redirect_to_invalid:
return True
# Compare 2 responses (wildcard one and given one)
ratio = self.dynamic_parser.compareTo(response.body)
# If the similarity ratio is high enough to proof it's wildcard
if ratio >= self.ratio:
return False
elif "redirect_to_invalid" in locals() and ratio >= (self.ratio - 0.18):
return False
return True
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