#!/usr/bin/env python

"""
Copyright (c) 2019-2020 Miroslav Stampar (@stamparm), MIT
See the file 'LICENSE' for copying permission

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
"""

from __future__ import print_function

import base64
import codecs
import difflib
import json
import locale
import optparse
import os
import random
import re
import ssl
import socket
import string
import struct
import sys
import time
import zlib

PY3 = sys.version_info >= (3, 0)

if PY3:
    import http.cookiejar
    import http.client as httplib
    import urllib.request

    build_opener = urllib.request.build_opener
    install_opener = urllib.request.install_opener
    quote = urllib.parse.quote
    urlopen = urllib.request.urlopen
    CookieJar = http.cookiejar.CookieJar
    ProxyHandler = urllib.request.ProxyHandler
    Request = urllib.request.Request
    HTTPCookieProcessor = urllib.request.HTTPCookieProcessor

    xrange = range
else:
    import cookielib
    import httplib
    import urllib
    import urllib2

    build_opener = urllib2.build_opener
    install_opener = urllib2.install_opener
    quote = urllib.quote
    urlopen = urllib2.urlopen
    CookieJar = cookielib.CookieJar
    ProxyHandler = urllib2.ProxyHandler
    Request = urllib2.Request
    HTTPCookieProcessor = urllib2.HTTPCookieProcessor

NAME = "identYwaf"
VERSION = "1.0.127"
BANNER = r"""
                                   ` __ __ `
 ____  ___      ___  ____   ______ `|  T  T` __    __   ____  _____ 
l    j|   \    /  _]|    \ |      T`|  |  |`|  T__T  T /    T|   __|
 |  T |    \  /  [_ |  _  Yl_j  l_j`|  ~  |`|  |  |  |Y  o  ||  l_
 |  | |  D  YY    _]|  |  |  |  |  `|___  |`|  |  |  ||     ||   _|
 j  l |     ||   [_ |  |  |  |  |  `|     !` \      / |  |  ||  ] 
|____jl_____jl_____jl__j__j  l__j  `l____/ `  \_/\_/  l__j__jl__j  (%s)%s""".strip("\n") % (VERSION, "\n")

RAW, TEXT, HTTPCODE, SERVER, TITLE, HTML, URL = xrange(7)
COOKIE, UA, REFERER = "Cookie", "User-Agent", "Referer"
GET, POST = "GET", "POST"
GENERIC_PROTECTION_KEYWORDS = ("rejected", "forbidden", "suspicious", "malicious", "captcha", "invalid", "your ip", "please contact", "terminated", "protected", "unauthorized", "blocked", "protection", "incident", "denied", "detected", "dangerous", "firewall", "fw_block", "unusual activity", "bad request", "request id", "injection", "permission", "not acceptable", "security policy", "security reasons")
GENERIC_PROTECTION_REGEX = r"(?i)\b(%s)\b"
GENERIC_ERROR_MESSAGE_REGEX = r"\b[A-Z][\w, '-]*(protected by|security|unauthorized|detected|attack|error|rejected|allowed|suspicious|automated|blocked|invalid|denied|permission)[\w, '!-]*"
WAF_RECOGNITION_REGEX = None
HEURISTIC_PAYLOAD = "1 AND 1=1 UNION ALL SELECT 1,NULL,'<script>alert(\"XSS\")</script>',table_name FROM information_schema.tables WHERE 2>1--/**/; EXEC xp_cmdshell('cat ../../../etc/passwd')#"  # Reference: https://github.com/sqlmapproject/sqlmap/blob/master/lib/core/settings.py
PAYLOADS = []
SIGNATURES = {}
DATA_JSON = {}
DATA_JSON_FILE = os.path.join(os.path.dirname(__file__), "data.json")
MAX_HELP_OPTION_LENGTH = 18
IS_TTY = sys.stdout.isatty()
IS_WIN = os.name == "nt"
COLORIZE = not IS_WIN and IS_TTY
LEVEL_COLORS = {"o": "\033[00;94m", "x": "\033[00;91m", "!": "\033[00;93m", "i": "\033[00;95m", "=": "\033[00;93m", "+": "\033[00;92m", "-": "\033[00;91m"}
VERIFY_OK_INTERVAL = 5
VERIFY_RETRY_TIMES = 3
MIN_MATCH_PARTIAL = 5
DEFAULTS = {"timeout": 10}
MAX_MATCHES = 5
QUICK_RATIO_THRESHOLD = 0.2
MAX_JS_CHALLENGE_SNAPLEN = 120
ENCODING_TRANSLATIONS = {"windows-874": "iso-8859-11", "utf-8859-1": "utf8", "en_us": "utf8", "macintosh": "iso-8859-1", "euc_tw": "big5_tw", "th": "tis-620", "unicode": "utf8", "utc8": "utf8", "ebcdic": "ebcdic-cp-be", "iso-8859": "iso8859-1", "iso-8859-0": "iso8859-1", "ansi": "ascii", "gbk2312": "gbk", "windows-31j": "cp932", "en": "us"}  # Reference: https://github.com/sqlmapproject/sqlmap/blob/master/lib/request/basic.py
PROXY_TESTING_PAGE = "https://myexternalip.com/raw"

if COLORIZE:
    for _ in re.findall(r"`.+?`", BANNER):
        BANNER = BANNER.replace(_, "\033[01;92m%s\033[00;49m" % _.strip('`'))
    for _ in re.findall(r" [Do] ", BANNER):
        BANNER = BANNER.replace(_, "\033[01;93m%s\033[00;49m" % _.strip('`'))
    BANNER = re.sub(VERSION, r"\033[01;91m%s\033[00;49m" % VERSION, BANNER)
else:
    BANNER = BANNER.replace('`', "")

_ = random.randint(20, 64)
DEFAULT_USER_AGENT = "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; %s; rv:%d.0) Gecko/20100101 Firefox/%d.0" % (NAME, _, _)
HEADERS = {"User-Agent": DEFAULT_USER_AGENT, "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", "Accept-Language": "en-US,en;q=0.5", "Accept-Encoding": "identity", "Cache-Control": "max-age=0"}

original = None
options = None
intrusive = None
heuristic = None
chained = False
locked_code = None
locked_regex = None
non_blind = set()
seen = set()
blocked = []
servers = set()
codes = set()
proxies = list()
proxies_index = 0

_exit = sys.exit

def exit(message=None):
    if message:
        print("%s%s" % (message, ' ' * 20))
    _exit(1)

def retrieve(url, data=None):
    global proxies_index

    retval = {}

    if proxies:
        while True:
            try:
                opener = build_opener(ProxyHandler({"http": proxies[proxies_index], "https": proxies[proxies_index]}))
                install_opener(opener)
                proxies_index = (proxies_index + 1) % len(proxies)
                urlopen(PROXY_TESTING_PAGE).read()
            except KeyboardInterrupt:
                raise
            except:
                pass
            else:
                break

    try:
        req = Request("".join(url[_].replace(' ', "%20") if _ > url.find('?') else url[_] for _ in xrange(len(url))), data, HEADERS)
        resp = urlopen(req, timeout=options.timeout)
        retval[URL] = resp.url
        retval[HTML] = resp.read()
        retval[HTTPCODE] = resp.code
        retval[RAW] = "%s %d %s\n%s\n%s" % (httplib.HTTPConnection._http_vsn_str, retval[HTTPCODE], resp.msg, str(resp.headers), retval[HTML])
    except Exception as ex:
        retval[URL] = getattr(ex, "url", url)
        retval[HTTPCODE] = getattr(ex, "code", None)
        try:
            retval[HTML] = ex.read() if hasattr(ex, "read") else getattr(ex, "msg", str(ex))
        except:
            retval[HTML] = ""
        retval[RAW] = "%s %s %s\n%s\n%s" % (httplib.HTTPConnection._http_vsn_str, retval[HTTPCODE] or "", getattr(ex, "msg", ""), str(ex.headers) if hasattr(ex, "headers") else "", retval[HTML])

    for encoding in re.findall(r"charset=[\s\"']?([\w-]+)", retval[RAW])[::-1] + ["utf8"]:
        encoding = ENCODING_TRANSLATIONS.get(encoding, encoding)
        try:
            retval[HTML] = retval[HTML].decode(encoding, errors="replace")
            break
        except:
            pass

    match = re.search(r"<title>\s*(?P<result>[^<]+?)\s*</title>", retval[HTML], re.I)
    retval[TITLE] = match.group("result") if match and "result" in match.groupdict() else None
    retval[TEXT] = re.sub(r"(?si)<script.+?</script>|<!--.+?-->|<style.+?</style>|<[^>]+>|\s+", " ", retval[HTML])
    match = re.search(r"(?im)^Server: (.+)", retval[RAW])
    retval[SERVER] = match.group(1).strip() if match else ""
    return retval

def calc_hash(value, binary=True):
    value = value.encode("utf8") if not isinstance(value, bytes) else value
    result = zlib.crc32(value) & 0xffff
    if binary:
        result = struct.pack(">H", result)
    return result

def single_print(message):
    if message not in seen:
        print(message)
        seen.add(message)

def check_payload(payload, protection_regex=GENERIC_PROTECTION_REGEX % '|'.join(GENERIC_PROTECTION_KEYWORDS)):
    global chained
    global heuristic
    global intrusive
    global locked_code
    global locked_regex

    time.sleep(options.delay or 0)
    if options.post:
        _ = "%s=%s" % ("".join(random.sample(string.ascii_letters, 3)), quote(payload))
        intrusive = retrieve(options.url, _)
    else:
        _ = "%s%s%s=%s" % (options.url, '?' if '?' not in options.url else '&', "".join(random.sample(string.ascii_letters, 3)), quote(payload))
        intrusive = retrieve(_)

    if options.lock and not payload.isdigit():
        if payload == HEURISTIC_PAYLOAD:
            match = re.search(re.sub(r"Server:|Protected by", "".join(random.sample(string.ascii_letters, 6)), WAF_RECOGNITION_REGEX, flags=re.I), intrusive[RAW] or "")
            if match:
                result = True

                for _ in match.groupdict():
                    if match.group(_):
                        waf = re.sub(r"\Awaf_", "", _)
                        locked_regex = DATA_JSON["wafs"][waf]["regex"]
                        locked_code = intrusive[HTTPCODE]
                        break
            else:
                result = False

            if not result:
                exit(colorize("[x] can't lock results to a non-blind match"))
        else:
            result = re.search(locked_regex, intrusive[RAW]) is not None and locked_code == intrusive[HTTPCODE]
    elif options.string:
        result = options.string in (intrusive[RAW] or "")
    elif options.code:
        result = options.code == intrusive[HTTPCODE]
    else:
        result = intrusive[HTTPCODE] != original[HTTPCODE] or (intrusive[HTTPCODE] != 200 and intrusive[TITLE] != original[TITLE]) or (re.search(protection_regex, intrusive[HTML]) is not None and re.search(protection_regex, original[HTML]) is None) or (difflib.SequenceMatcher(a=original[HTML] or "", b=intrusive[HTML] or "").quick_ratio() < QUICK_RATIO_THRESHOLD)

    if not payload.isdigit():
        if result:
            if options.debug:
                print("\r---%s" % (40 * ' '))
                print(payload)
                print(intrusive[HTTPCODE], intrusive[RAW])
                print("---")

            if intrusive[SERVER]:
                servers.add(re.sub(r"\s*\(.+\)\Z", "", intrusive[SERVER]))
                if len(servers) > 1:
                    chained = True
                    single_print(colorize("[!] multiple (reactive) rejection HTTP 'Server' headers detected (%s)" % ', '.join("'%s'" % _ for _ in sorted(servers))))

            if intrusive[HTTPCODE]:
                codes.add(intrusive[HTTPCODE])
                if len(codes) > 1:
                    chained = True
                    single_print(colorize("[!] multiple (reactive) rejection HTTP codes detected (%s)" % ', '.join("%s" % _ for _ in sorted(codes))))

            if heuristic and heuristic[HTML] and intrusive[HTML] and difflib.SequenceMatcher(a=heuristic[HTML] or "", b=intrusive[HTML] or "").quick_ratio() < QUICK_RATIO_THRESHOLD:
                chained = True
                single_print(colorize("[!] multiple (reactive) rejection HTML responses detected"))

    if payload == HEURISTIC_PAYLOAD:
        heuristic = intrusive

    return result

def colorize(message):
    if COLORIZE:
        message = re.sub(r"\[(.)\]", lambda match: "[%s%s\033[00;49m]" % (LEVEL_COLORS[match.group(1)], match.group(1)), message)

        if any(_ in message for _ in ("rejected summary", "challenge detected")):
            for match in re.finditer(r"[^\w]'([^)]+)'" if "rejected summary" in message else r"\('(.+)'\)", message):
                message = message.replace("'%s'" % match.group(1), "'\033[37m%s\033[00;49m'" % match.group(1), 1)
        else:
            for match in re.finditer(r"[^\w]'([^']+)'", message):
                message = message.replace("'%s'" % match.group(1), "'\033[37m%s\033[00;49m'" % match.group(1), 1)

        if "blind match" in message:
            for match in re.finditer(r"\(((\d+)%)\)", message):
                message = message.replace(match.group(1), "\033[%dm%s\033[00;49m" % (92 if int(match.group(2)) >= 95 else (93 if int(match.group(2)) > 80 else 90), match.group(1)))

        if "hardness" in message:
            for match in re.finditer(r"\(((\d+)%)\)", message):
                message = message.replace(match.group(1), "\033[%dm%s\033[00;49m" % (95 if " insane " in message else (91 if " hard " in message else (93 if " moderate " in message else 92)), match.group(1)))

    return message

def parse_args():
    global options

    parser = optparse.OptionParser(version=VERSION)
    parser.add_option("--delay", dest="delay", type=int, help="Delay (sec) between tests (default: 0)")
    parser.add_option("--timeout", dest="timeout", type=int, help="Response timeout (sec) (default: 10)")
    parser.add_option("--proxy", dest="proxy", help="HTTP proxy address (e.g. \"http://127.0.0.1:8080\")")
    parser.add_option("--proxy-file", dest="proxy_file", help="Load (rotating) HTTP(s) proxy list from a file")
    parser.add_option("--random-agent", dest="random_agent", action="store_true", help="Use random HTTP User-Agent header value")
    parser.add_option("--code", dest="code", type=int, help="Expected HTTP code in rejected responses")
    parser.add_option("--string", dest="string", help="Expected string in rejected responses")
    parser.add_option("--post", dest="post", action="store_true", help="Use POST body for sending payloads")
    parser.add_option("--debug", dest="debug", action="store_true", help=optparse.SUPPRESS_HELP)
    parser.add_option("--fast", dest="fast", action="store_true", help=optparse.SUPPRESS_HELP)
    parser.add_option("--lock", dest="lock", action="store_true", help=optparse.SUPPRESS_HELP)

    # Dirty hack(s) for help message
    def _(self, *args):
        retval = parser.formatter._format_option_strings(*args)
        if len(retval) > MAX_HELP_OPTION_LENGTH:
            retval = ("%%.%ds.." % (MAX_HELP_OPTION_LENGTH - parser.formatter.indent_increment)) % retval
        return retval

    parser.usage = "python %s <host|url>" % parser.usage
    parser.formatter._format_option_strings = parser.formatter.format_option_strings
    parser.formatter.format_option_strings = type(parser.formatter.format_option_strings)(_, parser)

    for _ in ("-h", "--version"):
        option = parser.get_option(_)
        option.help = option.help.capitalize()

    try:
        options, _ = parser.parse_args()
    except SystemExit:
        raise

    if len(sys.argv) > 1:
        url = sys.argv[-1]
        if not url.startswith("http"):
            url = "http://%s" % url
        options.url = url
    else:
        parser.print_help()
        raise SystemExit

    for key in DEFAULTS:
        if getattr(options, key, None) is None:
            setattr(options, key, DEFAULTS[key])

def load_data():
    global WAF_RECOGNITION_REGEX

    if os.path.isfile(DATA_JSON_FILE):
        with codecs.open(DATA_JSON_FILE, "rb", encoding="utf8") as f:
            DATA_JSON.update(json.load(f))

        WAF_RECOGNITION_REGEX = ""
        for waf in DATA_JSON["wafs"]:
            if DATA_JSON["wafs"][waf]["regex"]:
                WAF_RECOGNITION_REGEX += "%s|" % ("(?P<waf_%s>%s)" % (waf, DATA_JSON["wafs"][waf]["regex"]))
            for signature in DATA_JSON["wafs"][waf]["signatures"]:
                SIGNATURES[signature] = waf
        WAF_RECOGNITION_REGEX = WAF_RECOGNITION_REGEX.strip('|')

        flags = "".join(set(_ for _ in "".join(re.findall(r"\(\?(\w+)\)", WAF_RECOGNITION_REGEX))))
        WAF_RECOGNITION_REGEX = "(?%s)%s" % (flags, re.sub(r"\(\?\w+\)", "", WAF_RECOGNITION_REGEX))  # patch for "DeprecationWarning: Flags not at the start of the expression" in Python3.7
    else:
        exit(colorize("[x] file '%s' is missing" % DATA_JSON_FILE))

def init():
    os.chdir(os.path.abspath(os.path.dirname(__file__)))

    # Reference: http://blog.mathieu-leplatre.info/python-utf-8-print-fails-when-redirecting-stdout.html
    if not PY3 and not IS_TTY:
        sys.stdout = codecs.getwriter(locale.getpreferredencoding())(sys.stdout)

    print(colorize("[o] initializing handlers..."))

    # Reference: https://stackoverflow.com/a/28052583
    if hasattr(ssl, "_create_unverified_context"):
        ssl._create_default_https_context = ssl._create_unverified_context

    if options.proxy_file:
        if os.path.isfile(options.proxy_file):
            print(colorize("[o] loading proxy list..."))

            with codecs.open(options.proxy_file, "rb", encoding="utf8") as f:
                proxies.extend(re.sub(r"\s.*", "", _.strip()) for _ in f.read().strip().split('\n') if _.startswith("http"))
                random.shuffle(proxies)
        else:
            exit(colorize("[x] file '%s' does not exist" % options.proxy_file))


    cookie_jar = CookieJar()
    opener = build_opener(HTTPCookieProcessor(cookie_jar))
    install_opener(opener)

    if options.proxy:
        opener = build_opener(ProxyHandler({"http": options.proxy, "https": options.proxy}))
        install_opener(opener)

    if options.random_agent:
        revision = random.randint(20, 64)
        platform = random.sample(("X11; %s %s" % (random.sample(("Linux", "Ubuntu; Linux", "U; Linux", "U; OpenBSD", "U; FreeBSD"), 1)[0], random.sample(("amd64", "i586", "i686", "amd64"), 1)[0]), "Windows NT %s%s" % (random.sample(("5.0", "5.1", "5.2", "6.0", "6.1", "6.2", "6.3", "10.0"), 1)[0], random.sample(("", "; Win64", "; WOW64"), 1)[0]), "Macintosh; Intel Mac OS X 10.%s" % random.randint(1, 11)), 1)[0]
        user_agent = "Mozilla/5.0 (%s; rv:%d.0) Gecko/20100101 Firefox/%d.0" % (platform, revision, revision)
        HEADERS["User-Agent"] = user_agent

def format_name(waf):
    return "%s%s" % (DATA_JSON["wafs"][waf]["name"], (" (%s)" % DATA_JSON["wafs"][waf]["company"]) if DATA_JSON["wafs"][waf]["name"] != DATA_JSON["wafs"][waf]["company"] else "")

def non_blind_check(raw, silent=False):
    retval = False
    match = re.search(WAF_RECOGNITION_REGEX, raw or "")
    if match:
        retval = True
        for _ in match.groupdict():
            if match.group(_):
                waf = re.sub(r"\Awaf_", "", _)
                non_blind.add(waf)
                if not silent:
                    single_print(colorize("[+] non-blind match: '%s'%s" % (format_name(waf), 20 * ' ')))
    return retval

def run():
    global original

    hostname = options.url.split("//")[-1].split('/')[0].split(':')[0]

    if not hostname.replace('.', "").isdigit():
        print(colorize("[i] checking hostname '%s'..." % hostname))
        try:
            socket.getaddrinfo(hostname, None)
        except socket.gaierror:
            exit(colorize("[x] host '%s' does not exist" % hostname))

    results = ""
    signature = b""
    counter = 0
    original = retrieve(options.url)

    if 300 <= (original[HTTPCODE] or 0) < 400 and original[URL]:
        original = retrieve(original[URL])

    options.url = original[URL]

    if original[HTTPCODE] is None:
        exit(colorize("[x] missing valid response"))

    if not any((options.string, options.code)) and original[HTTPCODE] >= 400:
        non_blind_check(original[RAW])
        if options.debug:
            print("\r---%s" % (40 * ' '))
            print(original[HTTPCODE], original[RAW])
            print("---")
        exit(colorize("[x] access to host '%s' seems to be restricted%s" % (hostname, (" (%d: '<title>%s</title>')" % (original[HTTPCODE], original[TITLE].strip())) if original[TITLE] else "")))

    challenge = None
    if all(_ in original[HTML].lower() for _ in ("eval", "<script")):
        match = re.search(r"(?is)<body[^>]*>(.*)</body>", re.sub(r"(?is)<script.+?</script>", "", original[HTML]))
        if re.search(r"(?i)<(body|div)", original[HTML]) is None or (match and len(match.group(1)) == 0):
            challenge = re.search(r"(?is)<script.+</script>", original[HTML]).group(0).replace("\n", "\\n")
            print(colorize("[x] anti-robot JS challenge detected ('%s%s')" % (challenge[:MAX_JS_CHALLENGE_SNAPLEN], "..." if len(challenge) > MAX_JS_CHALLENGE_SNAPLEN else "")))

    protection_keywords = GENERIC_PROTECTION_KEYWORDS
    protection_regex = GENERIC_PROTECTION_REGEX % '|'.join(keyword for keyword in protection_keywords if keyword not in original[HTML].lower())

    print(colorize("[i] running basic heuristic test..."))
    if not check_payload(HEURISTIC_PAYLOAD):
        check = False
        if options.url.startswith("https://"):
            options.url = options.url.replace("https://", "http://")
            check = check_payload(HEURISTIC_PAYLOAD)
        if not check:
            if non_blind_check(intrusive[RAW]):
                exit(colorize("[x] unable to continue due to static responses%s" % (" (captcha)" if re.search(r"(?i)captcha", intrusive[RAW]) is not None else "")))
            elif challenge is None:
                exit(colorize("[x] host '%s' does not seem to be protected" % hostname))
            else:
                exit(colorize("[x] response not changing without JS challenge solved"))

    if options.fast and not non_blind:
        exit(colorize("[x] fast exit because of missing non-blind match"))

    if not intrusive[HTTPCODE]:
        print(colorize("[i] rejected summary: RST|DROP"))
    else:
        _ = "...".join(match.group(0) for match in re.finditer(GENERIC_ERROR_MESSAGE_REGEX, intrusive[HTML])).strip().replace("  ", " ")
        print(colorize(("[i] rejected summary: %d ('%s%s')" % (intrusive[HTTPCODE], ("<title>%s</title>" % intrusive[TITLE]) if intrusive[TITLE] else "", "" if not _ or intrusive[HTTPCODE] < 400 else ("...%s" % _))).replace(" ('')", "")))

    found = non_blind_check(intrusive[RAW] if intrusive[HTTPCODE] is not None else original[RAW])

    if not found:
        print(colorize("[-] non-blind match: -"))

    for item in DATA_JSON["payloads"]:
        info, payload = item.split("::", 1)
        counter += 1

        if IS_TTY:
            sys.stdout.write(colorize("\r[i] running payload tests... (%d/%d)\r" % (counter, len(DATA_JSON["payloads"]))))
            sys.stdout.flush()

        if counter % VERIFY_OK_INTERVAL == 0:
            for i in xrange(VERIFY_RETRY_TIMES):
                if not check_payload(str(random.randint(1, 9)), protection_regex):
                    break
                elif i == VERIFY_RETRY_TIMES - 1:
                    exit(colorize("[x] host '%s' seems to be misconfigured or rejecting benign requests%s" % (hostname, (" (%d: '<title>%s</title>')" % (intrusive[HTTPCODE], intrusive[TITLE].strip())) if intrusive[TITLE] else "")))
                else:
                    time.sleep(5)

        last = check_payload(payload, protection_regex)
        non_blind_check(intrusive[RAW])
        signature += struct.pack(">H", ((calc_hash(payload, binary=False) << 1) | last) & 0xffff)
        results += 'x' if last else '.'

        if last and info not in blocked:
            blocked.append(info)

    _ = calc_hash(signature)
    signature = "%s:%s" % (_.encode("hex") if not hasattr(_, "hex") else _.hex(), base64.b64encode(signature).decode("ascii"))

    print(colorize("%s[=] results: '%s'" % ("\n" if IS_TTY else "", results)))

    hardness = 100 * results.count('x') / len(results)
    print(colorize("[=] hardness: %s (%d%%)" % ("insane" if hardness >= 80 else ("hard" if hardness >= 50 else ("moderate" if hardness >= 30 else "easy")), hardness)))

    if blocked:
        print(colorize("[=] blocked categories: %s" % ", ".join(blocked)))

    if not results.strip('.') or not results.strip('x'):
        print(colorize("[-] blind match: -"))

        if re.search(r"(?i)captcha", original[HTML]) is not None:
            exit(colorize("[x] there seems to be an activated captcha"))
    else:
        print(colorize("[=] signature: '%s'" % signature))

        if signature in SIGNATURES:
            waf = SIGNATURES[signature]
            print(colorize("[+] blind match: '%s' (100%%)" % format_name(waf)))
        elif results.count('x') < MIN_MATCH_PARTIAL:
            print(colorize("[-] blind match: -"))
        else:
            matches = {}
            markers = set()
            decoded = base64.b64decode(signature.split(':')[-1])
            for i in xrange(0, len(decoded), 2):
                part = struct.unpack(">H", decoded[i: i + 2])[0]
                markers.add(part)

            for candidate in SIGNATURES:
                counter_y, counter_n = 0, 0
                decoded = base64.b64decode(candidate.split(':')[-1])
                for i in xrange(0, len(decoded), 2):
                    part = struct.unpack(">H", decoded[i: i + 2])[0]
                    if part in markers:
                        counter_y += 1
                    elif any(_ in markers for _ in (part & ~1, part | 1)):
                        counter_n += 1
                result = int(round(100 * counter_y / (counter_y + counter_n)))
                if SIGNATURES[candidate] in matches:
                    if result > matches[SIGNATURES[candidate]]:
                        matches[SIGNATURES[candidate]] = result
                else:
                    matches[SIGNATURES[candidate]] = result

            if chained:
                for _ in list(matches.keys()):
                    if matches[_] < 90:
                        del matches[_]

            if not matches:
                print(colorize("[-] blind match: - "))
                print(colorize("[!] probably chained web protection systems"))
            else:
                matches = [(_[1], _[0]) for _ in matches.items()]
                matches.sort(reverse=True)

                print(colorize("[+] blind match: %s" % ", ".join("'%s' (%d%%)" % (format_name(matches[i][1]), matches[i][0]) for i in xrange(min(len(matches), MAX_MATCHES) if matches[0][0] != 100 else 1))))

    print()

def main():
    if "--version" not in sys.argv:
        print(BANNER)

    parse_args()
    init()
    run()

load_data()

if __name__ == "__main__":
    try:
        main()
    except KeyboardInterrupt:
        exit(colorize("\r[x] Ctrl-C pressed"))