wafw00f源码详细解析

声明

本人菜鸟一枚，为了完成作业，发现网上所有的关于wafw00f的源码解析都是这抄那那抄这的，没有新东西，所以这里给出一个详细的源码解析，可能有错误，如果有大佬发现错误，可以在评论区平和的指出，如果觉得这篇文章对你有帮助，请点点赞和收藏^_^

这里不展示wafw00f的安装使用，这些可以去github上看wafw00f的readme，或者网上有挺多教程的，只解析其源码

前言

昨晚写了关于IdentYwaf的的源码解析：IdentYwaf源码详细解析
在这篇文章中我说到wafw00f在识别waf的能力上远远强于IdentYwaf，所以我就在写一篇wafw00f来证明为什么wafw00f比IdentYwaf要强的多
wafw00f工具可以去github下载：wafw00f

概述

至于什么是waf以及wafw00f是做什么的，这里大概总结一下：
waf就是网络程序防火墙，可以识别出一些非法语句，例如XSS和SQL注入语句，然后拦截这些语句
wafw00f以及IdentYwaf这些工具就是识别网站用了市面上哪些waf的，是渗透测试前期收集信息必不可少的一部分

wafw00f源码分析

wafw00f工作流程

和网上当然是不一样的啦

这里可以看出wafw00f的工作流程是比较简单的，它的核心就一个，identwaf函数

wafw00f文件目录

└─wafw00f│  .gitignore│  CODE_OF_CONDUCT.md│  CREDITS.txt│  Dockerfile│  LICENSE│  Makefile│  MANIFEST.in│  README.md│  setup.py   ├─docs│      conf.py│      index.rst│      Makefile│      wafw00f.8│      └─wafw00f│  main.py★★★│  manager.py│  wafprio.py│  __init__.py│  ├─bin│      wafw00f│      ├─lib│      asciiarts.py│      evillib.py★★★│      __init__.py│      └─plugins★★★★aesecure.pyairee.pyairlock.pyalertlogic.pyaliyundun.py...__init__.py

wafw00f核心流程分析

我分析wafw00f的过程主要分成两个部分，因为这个工具最重要的就两个文件main.py和evillib.py，我就分成两个文件来解析，这里先解析evillib.py再解析main.py，至于用到的其它文件我就把里面的函数当成集成在main.py和evillib.py文件里面了

最后我们还会详细解析plugins目录里面的一些东西，这个插件目录是wafw00f的超级核心

evillib.py

整个文件内容：

#!/usr/bin/env python
'''
Copyright (C) 2022, WAFW00F Developers.
See the LICENSE file for copying permission.
'''import time
import logging
from copy import copyimport requests
import urllib3
try:from urlparse import urlparse, urlunparse
except ImportError:from urllib.parse import urlparse, urlunparse# For requests < 2.16, this should be used.
# requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
# For requests >= 2.16, this is the convention
urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)def_headers = {'Accept'         : 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3','Accept-Encoding': 'gzip, deflate','Accept-Language': 'en-US,en;q=0.9','DNT'            : '1',  # Do Not Track request header'User-Agent'     : 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3770.100 Safari/537.36','Upgrade-Insecure-Requests': '1' #}
proxies = {}def urlParser(target):log = logging.getLogger('urlparser')ssl = Falseo = urlparse(target)if o[0] not in ['http', 'https', '']:log.error('scheme %s not supported' % o[0])returnif o[0] == 'https':ssl = Trueif len(o[2]) > 0:path = o[2]else:path = '/'tmp = o[1].split(':')if len(tmp) > 1:port = tmp[1]else:port = Nonehostname = tmp[0]query = o[4]return (hostname, port, path, query, ssl)class waftoolsengine:def __init__(self, target='https://example.com', debuglevel=0, path='/', proxies=None,redir=True, head=None):self.target = targetself.debuglevel = debuglevelself.requestnumber = 0self.path = pathself.redirectno = 0self.allowredir = redirself.proxies = proxiesself.log = logging.getLogger('wafw00f')if head:self.headers = headelse:self.headers = copy(def_headers) #copy object by value not reference. Fix issue #90def Request(self, headers=None, path=None, params={}, delay=0, timeout=7):try:time.sleep(delay)if not headers:h = self.headerselse: h = headersreq = requests.get(self.target, proxies=self.proxies, headers=h, timeout=timeout,allow_redirects=self.allowredir, params=params, verify=False)self.log.info('Request Succeeded')self.log.debug('Headers: %s\n' % req.headers)self.log.debug('Content: %s\n' % req.content)self.requestnumber += 1return reqexcept requests.exceptions.RequestException as e:self.log.error('Something went wrong %s' % (e.__str__()))

主要有三个东西：urlParser()函数、waftoolsengine类、默认的Headers

默认Headers

def_headers = {'Accept'         : 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3','Accept-Encoding': 'gzip, deflate','Accept-Language': 'en-US,en;q=0.9','DNT'            : '1',  # Do Not Track request header'User-Agent'     : 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3770.100 Safari/537.36','Upgrade-Insecure-Requests': '1' #}

没什么好讲的，跳

urlParser(target)函数

def urlParser(target):log = logging.getLogger('urlparser')ssl = Falseo = urlparse(target)if o[0] not in ['http', 'https', '']:log.error('scheme %s not supported' % o[0])returnif o[0] == 'https':ssl = Trueif len(o[2]) > 0:path = o[2]else:path = '/'tmp = o[1].split(':')if len(tmp) > 1:port = tmp[1]else:port = Nonehostname = tmp[0]query = o[4]return (hostname, port, path, query, ssl)

wafw00f如果不提供完整的url和端口号，会出现如下错误：

ERROR:wafw00f:Something went wrong
HTTPSConnectionPool(host=‘117.39.30.114’, port=443): Max retries
exceeded with url: / (Caused by SSLError(SSLError(1, ‘[SSL:
UNSUPPORTED_PROTOCOL] unsupported protocol (_ssl.c:1129)’)))
ERROR:wafw00f:Site 117.39.30.114 appears to be down

其中错误是在urlparse(target)发出来的
https:// 默认端口号为443，http://默认端口号为80，若遇到仅开放8080等其他情况的网站，需要指定网站端口号才能顺利扫描识别waf，且务必告知是https访问还是http访问。否则urlparse均会抛出错误。

如果urlparse顺利过关，则会返回如下内容：

<scheme>://<netloc>/<path>;<params>?<query>#<fragment>

urlParser则返回：

hostname = netloc.split(“:”)[0]
prot = netloc.split(“:”)[1]
path = path
query = query
ssl = True if scheme == “https” else False

这个函数就是关于url解析的一个函数

waftoolsengine类

class waftoolsengine:def __init__(self, target='https://example.com', debuglevel=0, path='/', proxies=None,redir=True, head=None):self.target = targetself.debuglevel = debuglevelself.requestnumber = 0self.path = pathself.redirectno = 0self.allowredir = redirself.proxies = proxiesself.log = logging.getLogger('wafw00f')if head:self.headers = headelse:self.headers = copy(def_headers) #copy object by value not reference. Fix issue #90def Request(self, headers=None, path=None, params={}, delay=0, timeout=7):try:time.sleep(delay)if not headers:h = self.headerselse: h = headersreq = requests.get(self.target, proxies=self.proxies, headers=h, timeout=timeout,allow_redirects=self.allowredir, params=params, verify=False)self.log.info('Request Succeeded')self.log.debug('Headers: %s\n' % req.headers)self.log.debug('Content: %s\n' % req.content)self.requestnumber += 1return reqexcept requests.exceptions.RequestException as e:self.log.error('Something went wrong %s' % (e.__str__()))

这个类主要有两个部分，初始化和请求，不难看懂，后面的main.py会实例化一个这个类，并不断用实例化对象进行操作，所以我们后面再来详细解析这里面都做了什么操作

main.py

先来看看WAFW00F类（继承自waftoolsengine类）

class WAFW00F(waftoolsengine):xsstring = '<script>alert("XSS");</script>'sqlistring = "UNION SELECT ALL FROM information_schema AND ' or SLEEP(5) or '"lfistring = '../../../../etc/passwd'rcestring = '/bin/cat /etc/passwd; ping 127.0.0.1; curl google.com'xxestring = '<!ENTITY xxe SYSTEM "file:///etc/shadow">]><pwn>&hack;</pwn>'def __init__(self, target='www.example.com', debuglevel=0, path='/',followredirect=True, extraheaders={}, proxies=None):self.log = logging.getLogger('wafw00f')self.attackres = Nonewaftoolsengine.__init__(self, target, debuglevel, path, proxies, followredirect, extraheaders)self.knowledge = dict(generic=dict(found=False, reason=''), wafname=list())self.rq = self.normalRequest()def normalRequest(self):return self.Request()def customRequest(self, headers=None):return self.Request(headers=headers)def nonExistent(self):return self.Request(path=self.path + str(random.randrange(100, 999)) + '.html')def xssAttack(self):return self.Request(path=self.path, params= {'s': self.xsstring})def xxeAttack(self):return self.Request(path=self.path, params= {'s': self.xxestring})def lfiAttack(self):return self.Request(path=self.path + self.lfistring)def centralAttack(self):return self.Request(path=self.path, params={'a': self.xsstring, 'b': self.sqlistring, 'c': self.lfistring})def sqliAttack(self):return self.Request(path=self.path, params= {'s': self.sqlistring})def oscAttack(self):return self.Request(path=self.path, params= {'s': self.rcestring})def performCheck(self, request_method):r = request_method()if r is None:raise RequestBlocked()return r# Most common attacks used to detect WAFsattcom = [xssAttack, sqliAttack, lfiAttack]attacks = [xssAttack, xxeAttack, lfiAttack, sqliAttack, oscAttack]def genericdetect(self):reason = ''reasons = ['Blocking is being done at connection/packet level.','The server header is different when an attack is detected.','The server returns a different response code when an attack string is used.','It closed the connection for a normal request.','The response was different when the request wasn\'t made from a browser.']try:# Testing for no user-agent response. Detects almost all WAFs out there.resp1 = self.performCheck(self.normalRequest)if 'User-Agent' in self.headers:self.headers.pop('User-Agent')  # Deleting the user-agent key from object not dict.resp3 = self.customRequest(headers=self.headers)if resp3 is not None and resp1 is not None:if resp1.status_code != resp3.status_code:self.log.info('Server returned a different response when request didn\'t contain the User-Agent header.')reason = reasons[4]reason += '\r\n'reason += 'Normal response code is "%s",' % resp1.status_codereason += ' while the response code to a modified request is "%s"' % resp3.status_codeself.knowledge['generic']['reason'] = reasonself.knowledge['generic']['found'] = Truereturn True# Testing the status code upon sending a xss attackresp2 = self.performCheck(self.xssAttack)if resp1.status_code != resp2.status_code:self.log.info('Server returned a different response when a XSS attack vector was tried.')reason = reasons[2]reason += '\r\n'reason += 'Normal response code is "%s",' % resp1.status_codereason += ' while the response code to cross-site scripting attack is "%s"' % resp2.status_codeself.knowledge['generic']['reason'] = reasonself.knowledge['generic']['found'] = Truereturn True# Testing the status code upon sending a lfi attackresp2 = self.performCheck(self.lfiAttack)if resp1.status_code != resp2.status_code:self.log.info('Server returned a different response when a directory traversal was attempted.')reason = reasons[2]reason += '\r\n'reason += 'Normal response code is "%s",' % resp1.status_codereason += ' while the response code to a file inclusion attack is "%s"' % resp2.status_codeself.knowledge['generic']['reason'] = reasonself.knowledge['generic']['found'] = Truereturn True# Testing the status code upon sending a sqli attackresp2 = self.performCheck(self.sqliAttack)if resp1.status_code != resp2.status_code:self.log.info('Server returned a different response when a SQLi was attempted.')reason = reasons[2]reason += '\r\n'reason += 'Normal response code is "%s",' % resp1.status_codereason += ' while the response code to a SQL injection attack is "%s"' % resp2.status_codeself.knowledge['generic']['reason'] = reasonself.knowledge['generic']['found'] = Truereturn True# Checking for the Server header after sending malicious requestsnormalserver, attackresponse_server = '', ''response = self.attackresif 'server' in resp1.headers:normalserver = resp1.headers.get('Server')if response is not None and 'server' in response.headers:attackresponse_server = response.headers.get('Server')if attackresponse_server != normalserver:self.log.info('Server header changed, WAF possibly detected')self.log.debug('Attack response: %s' % attackresponse_server)self.log.debug('Normal response: %s' % normalserver)reason = reasons[1]reason += '\r\nThe server header for a normal response is "%s",' % normalserverreason += ' while the server header a response to an attack is "%s",' % attackresponse_serverself.knowledge['generic']['reason'] = reasonself.knowledge['generic']['found'] = Truereturn True# If at all request doesn't go, press Fexcept RequestBlocked:self.knowledge['generic']['reason'] = reasons[0]self.knowledge['generic']['found'] = Truereturn Truereturn Falsedef matchHeader(self, headermatch, attack=False):if attack:r = self.attackreselse:r = self.rqif r is None:returnheader, match = headermatchheaderval = r.headers.get(header)if headerval:# set-cookie can have multiple headers, python gives it to us# concatinated with a commaif header == 'Set-Cookie':headervals = headerval.split(', ')else:headervals = [headerval]for headerval in headervals:if re.search(match, headerval, re.I):return Truereturn Falsedef matchStatus(self, statuscode, attack=True):if attack:r = self.attackreselse:r = self.rqif r is None:returnif r.status_code == statuscode:return Truereturn Falsedef matchCookie(self, match, attack=False):return self.matchHeader(('Set-Cookie', match), attack=attack)def matchReason(self, reasoncode, attack=True):if attack:r = self.attackreselse:r = self.rqif r is None:return# We may need to match multiline context in response bodyif str(r.reason) == reasoncode:return Truereturn Falsedef matchContent(self, regex, attack=True):if attack:r = self.attackreselse:r = self.rqif r is None:return# We may need to match multiline context in response bodyif re.search(regex, r.text, re.I):return Truereturn Falsewafdetections = dict()plugin_dict = load_plugins()result_dict = {}for plugin_module in plugin_dict.values():wafdetections[plugin_module.NAME] = plugin_module.is_waf# Check for prioritized ones first, then check those added externallychecklist = wafdetectionspriochecklist += list(set(wafdetections.keys()) - set(checklist))def identwaf(self, findall=False):detected = list()try:self.attackres = self.performCheck(self.centralAttack)except RequestBlocked:return detectedfor wafvendor in self.checklist:self.log.info('Checking for %s' % wafvendor)if self.wafdetections[wafvendor](self):detected.append(wafvendor)if not findall:breakself.knowledge['wafname'] = detectedreturn detected

我们在后续分析中再来一点一点拆解这个类，直接分析没啥大用

主流程

def main():parser = OptionParser(usage='%prog url1 [url2 [url3 ... ]]\r\nexample: %prog http://www.victim.org/')parser.add_option('-v', '--verbose', action='count', dest='verbose', default=0,help='Enable verbosity, multiple -v options increase verbosity')parser.add_option('-a', '--findall', action='store_true', dest='findall', default=False,help='Find all WAFs which match the signatures, do not stop testing on the first one')parser.add_option('-r', '--noredirect', action='store_false', dest='followredirect',default=True, help='Do not follow redirections given by 3xx responses')parser.add_option('-t', '--test', dest='test', help='Test for one specific WAF')parser.add_option('-o', '--output', dest='output', help='Write output to csv, json or text file depending on file extension. For stdout, specify - as filename.',default=None)parser.add_option('-f', '--format', dest='format', help='Force output format to csv, json or text.',default=None)parser.add_option('-i', '--input-file', dest='input', help='Read targets from a file. Input format can be csv, json or text. For csv and json, a `url` column name or element is required.',default=None)parser.add_option('-l', '--list', dest='list', action='store_true',default=False, help='List all WAFs that WAFW00F is able to detect')parser.add_option('-p', '--proxy', dest='proxy', default=None,help='Use an HTTP proxy to perform requests, examples: http://hostname:8080, socks5://hostname:1080, http://user:pass@hostname:8080')parser.add_option('--version', '-V', dest='version', action='store_true',default=False, help='Print out the current version of WafW00f and exit.')parser.add_option('--headers', '-H', dest='headers', action='store', default=None,help='Pass custom headers via a text file to overwrite the default header set.')options, args = parser.parse_args()logging.basicConfig(level=calclogginglevel(options.verbose))log = logging.getLogger('wafw00f')if options.output == '-':disableStdOut()print(randomArt())if options.list:print('[+] Can test for these WAFs:\r\n')try:m = [i.replace(')', '').split(' (') for i in wafdetectionsprio]print(R+'  WAF Name'+' '*24+'Manufacturer\n  '+'-'*8+' '*24+'-'*12+'\n')max_len = max(len(str(x)) for k in m for x in k)for inner in m:first = Truefor elem in inner:if first:text = Y+"  {:<{}} ".format(elem, max_len+2)first = Falseelse:text = W+"{:<{}} ".format(elem, max_len+2)print(text, E, end="")print()sys.exit(0)except Exception:returnif options.version:print('[+] The version of WAFW00F you have is %sv%s%s' % (B, __version__, E))print('[+] WAFW00F is provided under the %s%s%s license.' % (C, __license__, E))returnextraheaders = {}if options.headers:log.info('Getting extra headers from %s' % options.headers)extraheaders = getheaders(options.headers)if extraheaders is None:parser.error('Please provide a headers file with colon delimited header names and values')# arg1# if len(args) == 0 and not options.input:#     parser.error('No test target specified.')#check if input file is presentif options.input:log.debug("Loading file '%s'" % options.input)try:if options.input.endswith('.json'):with open(options.input) as f:try:urls = json.loads(f.read())except json.decoder.JSONDecodeError:log.critical("JSON file %s did not contain well-formed JSON", options.input)sys.exit(1)log.info("Found: %s urls to check." %(len(urls)))targets = [ item['url'] for item in urls ]elif options.input.endswith('.csv'):columns = defaultdict(list)with open(options.input) as f:reader = csv.DictReader(f)for row in reader:for (k,v) in row.items():columns[k].append(v)targets = columns['url']else:with open(options.input) as f:targets = [x for x in f.read().splitlines()]except FileNotFoundError:log.error('File %s could not be read. No targets loaded.', options.input)sys.exit(1)else:targets = argsresults = []# arg2targets = ["117.39.30.114"]for target in targets:if not target.startswith('http'):log.info('The url %s should start with http:// or https:// .. fixing (might make this unusable)' % target)target = 'https://' + targetprint('[*] Checking %s' % target)pret = urlParser(target)if pret is None:log.critical('The url %s is not well formed' % target)sys.exit(1)(hostname, _, path, _, _) = pretlog.info('starting wafw00f on %s' % target)proxies = dict()if options.proxy:proxies = {"http": options.proxy,"https": options.proxy,}# arg3attacker = WAFW00F(target, debuglevel=options.verbose, path=path,followredirect=options.followredirect, extraheaders=extraheaders,proxies=proxies)if attacker.rq is None:log.error('Site %s appears to be down' % hostname)continue# arg4# 测试指定的wafif options.test:if options.test in attacker.wafdetections:waf = attacker.wafdetections[options.test](attacker)if waf:print('[+] The site %s%s%s is behind %s%s%s WAF.' % (B, target, E, C, options.test, E))else:print('[-] WAF %s was not detected on %s' % (options.test, target))else:print('[-] WAF %s was not found in our list\r\nUse the --list option to see what is available' % options.test)returnwaf = attacker.identwaf(options.findall)log.info('Identified WAF: %s' % waf)if len(waf) > 0:for i in waf:results.append(buildResultRecord(target, i))print('[+] The site %s%s%s is behind %s%s%s WAF.' % (B, target, E, C, (E+' and/or '+C).join(waf), E))if (options.findall) or len(waf) == 0:print('[+] Generic Detection results:')if attacker.genericdetect():log.info('Generic Detection: %s' % attacker.knowledge['generic']['reason'])print('[*] The site %s seems to be behind a WAF or some sort of security solution' % target)print('[~] Reason: %s' % attacker.knowledge['generic']['reason'])results.append(buildResultRecord(target, 'generic'))else:print('[-] No WAF detected by the generic detection')results.append(buildResultRecord(target, None))print('[~] Number of requests: %s' % attacker.requestnumber)#print table of resultsif len(results) > 0:log.info("Found: %s matches." % (len(results)))if options.output:if options.output == '-':enableStdOut()if options.format == 'json':json.dump(results, sys.stdout, indent=2)elif options.format == 'csv':csvwriter = csv.writer(sys.stdout, delimiter=',', quotechar='"',quoting=csv.QUOTE_MINIMAL)count = 0for result in results:if count == 0:header = result.keys()csvwriter.writerow(header)count += 1csvwriter.writerow(result.values())else:print(os.linesep.join(getTextResults(results)))elif options.output.endswith('.json'):log.debug("Exporting data in json format to file: %s" % (options.output))with open(options.output, 'w') as outfile:json.dump(results, outfile, indent=2)elif options.output.endswith('.csv'):log.debug("Exporting data in csv format to file: %s" % (options.output))with open(options.output, 'w') as outfile:csvwriter = csv.writer(outfile, delimiter=',', quotechar='"',quoting=csv.QUOTE_MINIMAL)count = 0for result in results:if count == 0:header = result.keys()csvwriter.writerow(header)count += 1csvwriter.writerow(result.values())else:log.debug("Exporting data in text format to file: %s" % (options.output))if options.format == 'json':with open(options.output, 'w') as outfile:json.dump(results, outfile, indent=2)elif options.format == 'csv':with open(options.output, 'w') as outfile:csvwriter = csv.writer(outfile, delimiter=',', quotechar='"',quoting=csv.QUOTE_MINIMAL)count = 0for result in results:if count == 0:header = result.keys()csvwriter.writerow(header)count += 1csvwriter.writerow(result.values())else:with open(options.output, 'w') as outfile:outfile.write(os.linesep.join(getTextResults(results)))if __name__ == '__main__':if sys.hexversion < 0x2060000:sys.stderr.write('Your version of python is way too old... please update to 2.6 or later\r\n')main()

wafw00f上来就开大，一个main()函数集成了一大堆代码，这个确实不太好，个人认为应该还是把一些部分像IdentYwaf那样封装成一个参数，这样处理起来就不会出现大改而是把改代码局限在小区域内

读入参数部分

	parser = OptionParser(usage='%prog url1 [url2 [url3 ... ]]\r\nexample: %prog http://www.victim.org/')parser.add_option('-v', '--verbose', action='count', dest='verbose', default=0,help='Enable verbosity, multiple -v options increase verbosity')parser.add_option('-a', '--findall', action='store_true', dest='findall', default=False,help='Find all WAFs which match the signatures, do not stop testing on the first one')parser.add_option('-r', '--noredirect', action='store_false', dest='followredirect',default=True, help='Do not follow redirections given by 3xx responses')parser.add_option('-t', '--test', dest='test', help='Test for one specific WAF')parser.add_option('-o', '--output', dest='output', help='Write output to csv, json or text file depending on file extension. For stdout, specify - as filename.',default=None)parser.add_option('-f', '--format', dest='format', help='Force output format to csv, json or text.',default=None)parser.add_option('-i', '--input-file', dest='input', help='Read targets from a file. Input format can be csv, json or text. For csv and json, a `url` column name or element is required.',default=None)parser.add_option('-l', '--list', dest='list', action='store_true',default=False, help='List all WAFs that WAFW00F is able to detect')parser.add_option('-p', '--proxy', dest='proxy', default=None,help='Use an HTTP proxy to perform requests, examples: http://hostname:8080, socks5://hostname:1080, http://user:pass@hostname:8080')parser.add_option('--version', '-V', dest='version', action='store_true',default=False, help='Print out the current version of WafW00f and exit.')parser.add_option('--headers', '-H', dest='headers', action='store', default=None,help='Pass custom headers via a text file to overwrite the default header set.')options, args = parser.parse_args()logging.basicConfig(level=calclogginglevel(options.verbose))log = logging.getLogger('wafw00f')

这样看有点太难看了，直接看-h吧

proxy、output、headers、findall是比较有可能用到的参数，但是我都不用，我只解析源码，哈哈

核心流程

咱们还是跳过大部分的无用代码部分吧，确实没啥好分析的，直接关注一下下面这部分代码：

    if options.input:log.debug("Loading file '%s'" % options.input)try:if options.input.endswith('.json'):with open(options.input) as f:try:urls = json.loads(f.read())except json.decoder.JSONDecodeError:log.critical("JSON file %s did not contain well-formed JSON", options.input)sys.exit(1)log.info("Found: %s urls to check." %(len(urls)))targets = [ item['url'] for item in urls ]elif options.input.endswith('.csv'):columns = defaultdict(list)with open(options.input) as f:reader = csv.DictReader(f)for row in reader:for (k,v) in row.items():columns[k].append(v)targets = columns['url']else:with open(options.input) as f:targets = [x for x in f.read().splitlines()]except FileNotFoundError:log.error('File %s could not be read. No targets loaded.', options.input)sys.exit(1)else:targets = argsresults = []for target in targets:if not target.startswith('http'):log.info('The url %s should start with http:// or https:// .. fixing (might make this unusable)' % target)target = 'https://' + targetprint('[*] Checking %s' % target)pret = urlParser(target)if pret is None:log.critical('The url %s is not well formed' % target)sys.exit(1)(hostname, _, path, _, _) = pretlog.info('starting wafw00f on %s' % target)proxies = dict()if options.proxy:proxies = {"http": options.proxy,"https": options.proxy,}attacker = WAFW00F(target, debuglevel=options.verbose, path=path,followredirect=options.followredirect, extraheaders=extraheaders,proxies=proxies)if attacker.rq is None:log.error('Site %s appears to be down' % hostname)continueif options.test:if options.test in attacker.wafdetections:waf = attacker.wafdetections[options.test](attacker)if waf:print('[+] The site %s%s%s is behind %s%s%s WAF.' % (B, target, E, C, options.test, E))else:print('[-] WAF %s was not detected on %s' % (options.test, target))else:print('[-] WAF %s was not found in our list\r\nUse the --list option to see what is available' % options.test)returnwaf = attacker.identwaf(options.findall)log.info('Identified WAF: %s' % waf)if len(waf) > 0:for i in waf:results.append(buildResultRecord(target, i))print('[+] The site %s%s%s is behind %s%s%s WAF.' % (B, target, E, C, (E+' and/or '+C).join(waf), E))if (options.findall) or len(waf) == 0:print('[+] Generic Detection results:')if attacker.genericdetect():log.info('Generic Detection: %s' % attacker.knowledge['generic']['reason'])print('[*] The site %s seems to be behind a WAF or some sort of security solution' % target)print('[~] Reason: %s' % attacker.knowledge['generic']['reason'])results.append(buildResultRecord(target, 'generic'))else:print('[-] No WAF detected by the generic detection')results.append(buildResultRecord(target, None))print('[~] Number of requests: %s' % attacker.requestnumber)

哇塞，还是好长，来，跟着小弟我继续分解这段代码

 if options.input:log.debug("Loading file '%s'" % options.input)try:if options.input.endswith('.json'):with open(options.input) as f:try:urls = json.loads(f.read())except json.decoder.JSONDecodeError:log.critical("JSON file %s did not contain well-formed JSON", options.input)sys.exit(1)log.info("Found: %s urls to check." %(len(urls)))targets = [ item['url'] for item in urls ]elif options.input.endswith('.csv'):columns = defaultdict(list)with open(options.input) as f:reader = csv.DictReader(f)for row in reader:for (k,v) in row.items():columns[k].append(v)targets = columns['url']else:with open(options.input) as f:targets = [x for x in f.read().splitlines()]except FileNotFoundError:log.error('File %s could not be read. No targets loaded.', options.input)sys.exit(1)else:targets = args

这部分就是说我们要检测的网站url读入，如果指定了一个多个网站检测的文件，它就从文件中读取url到targets中，否则直接从控制台的args里存储到targets中

	for target in targets:if not target.startswith('http'):log.info('The url %s should start with http:// or https:// .. fixing (might make this unusable)' % target)target = 'https://' + targetprint('[*] Checking %s' % target)pret = urlParser(target)if pret is None:log.critical('The url %s is not well formed' % target)sys.exit(1)(hostname, _, path, _, _) = pretlog.info('starting wafw00f on %s' % target)proxies = dict()if options.proxy:proxies = {"http": options.proxy,"https": options.proxy,}attacker = WAFW00F(target, debuglevel=options.verbose, path=path,followredirect=options.followredirect, extraheaders=extraheaders,proxies=proxies)if attacker.rq is None:log.error('Site %s appears to be down' % hostname)continueif options.test:if options.test in attacker.wafdetections:waf = attacker.wafdetections[options.test](attacker)if waf:print('[+] The site %s%s%s is behind %s%s%s WAF.' % (B, target, E, C, options.test, E))else:print('[-] WAF %s was not detected on %s' % (options.test, target))else:print('[-] WAF %s was not found in our list\r\nUse the --list option to see what is available' % options.test)return

这个循环首先是从targets从获取每一个target

然后看看target是否有http开头，没有就默认给一个https://，这里其实是有问题的，IdentYwaf也是默认给https://，但是如果https://有问题会试一下http://，而wafw00f则没有这个处理，所以如果有网站的ssl证书过期了，且我们给的target只有hostname而没有指定协议的话，wafw00f就没法检测了，这里可以处理一下兼容http://的情况

接着就用了urlParser函数来解析target，使用pret存储返回的内容：

hostname = netloc.split(“:”)[0]
prot = netloc.split(“:”)[1]
path = path
query = query
ssl = True if scheme == “https” else False

pret如果不存在，说明url不合法，直接退出即可
存在则从pret中读取hostname和path信息

		pret = urlParser(target)if pret is None:log.critical('The url %s is not well formed' % target)sys.exit(1)(hostname, _, path, _, _) = pret

配置代理

		proxies = dict()if options.proxy:proxies = {"http": options.proxy,"https": options.proxy,}

重点来了，WAFW00F类是继承waftoolsengine类开发的一个类：

		attacker = WAFW00F(target, debuglevel=options.verbose, path=path,followredirect=options.followredirect, extraheaders=extraheaders,proxies=proxies)

我们，我们看看WAFW00F类的初始化，看看这个实例化对象有什么稀奇的：

class WAFW00F(waftoolsengine):def __init__(self, target='www.example.com', debuglevel=0, path='/',followredirect=True, extraheaders={}, proxies=None):self.log = logging.getLogger('wafw00f')self.attackres = Nonewaftoolsengine.__init__(self, target, debuglevel, path, proxies, followredirect, extraheaders)self.knowledge = dict(generic=dict(found=False, reason=''), wafname=list())self.rq = self.normalRequest()

首先就是target，指定测试的对象
然后重点关注一下path、followredirect
这个path就是我们解析url整出来的path
followredirect应该就是允许处理重定向包的情况，这一个选择使得wafw00f在处理response上就比IdentYwaf要强上不少。
接着往下看，waftoolsengine此时也被初始化了一次，这个是直接对整个waftoolsengine初始化，也就是说，在这个target处理过程，关于引擎的使用都受这次初始化影响，直到下次初始化（遍历到下一个target）

self.knowledge = dict(generic=dict(found=False, reason=‘’), wafname=list())

是为WAFW00F类的实例化对象attacker整了一个知识属性，这个属性是一个类似json的格式存储的，第一个键是generic，第二个键是wafname，generic的值是一个字典，有两个键，一个是found，一个是reason，这个知识属性具体什么用我们后续再来看，主要是应用在输出上面的，与我们测试识别关系不大，不太重要

重点来了
接下来的内容重点挺多的，大家这里最好自己去调试跑一跑看看什么个情况。

self.rq = self.normalRequest()

实例化对象接下来就会直接调用这个rq，attacker.rq就是attacker.normalRequest()
我们来看看normalRequest

    def normalRequest(self):return self.Request()

接着往下找，这个Request就是waftoolsengine的那个Request，我们什么都不传，直接按照默认的来：

    def Request(self, headers=None, path=None, params={}, delay=0, timeout=7):try:time.sleep(delay)if not headers:h = self.headerselse: h = headersreq = requests.get(self.target, proxies=self.proxies, headers=h, timeout=timeout,allow_redirects=self.allowredir, params=params, verify=False)self.log.info('Request Succeeded')self.log.debug('Headers: %s\n' % req.headers)self.log.debug('Content: %s\n' % req.content)self.requestnumber += 1return reqexcept requests.exceptions.RequestException as e:self.log.error('Something went wrong %s' % (e.__str__()))

这里重点看这一段：

			req = requests.get(self.target, proxies=self.proxies, headers=h, timeout=timeout,allow_redirects=self.allowredir, params=params, verify=False)

因为我们已经初始化过一次全局的引擎了，这里request的参数引擎都是知道的，所以我们是不需要传参的。
显然wafw00f很高明，它把请求和处理分开了，所以我们后面再看看它的处理是如何实现的（比IdentYwaf要好上不少）

回到我们的主流程中，接下来我们就要调用rq了

		if attacker.rq is None:log.error('Site %s appears to be down' % hostname)continue

现在我们可以看出来rq是做什么的了，就是测试网站是否还存活的，IdentYwaf看是否存活是看返回包的情况，而wafw00f是看是否有返回包，我个人认为wafw00f的方法更加好，因为很多网站是需要加上特定的path才能正常访问的，wafw00f这样可以避免访问结果为400等状况外的情况而不处理了的情况。（如果网站不存活了，那么是什么包都不会返回的，对，404都没有哈哈）
而且wafw00f使用的是request，可以处理重定向的网站，而IdentYwaf用的是urllib3，处理不了重定向，不能处理重定向就不能处理返回包状态为300的情况，所以IdentYwaf被wafw00f簿杀不是没有原因的。

如果网站还存活，那么我就可以去看看它是否有WAF了
当然，接下来还有一段是测试指定waf
这段我调试时没怎么管

			waf = attacker.wafdetections[options.test](attacker)

这段代码里关键就是这个玩意，那么关键就是attacker这个WAFW00F实例化对象里的wafdetections是什么咯，这里还是先不分析了，后面我们讲到identwaf的时候会详细分析这个东西的。

所以这一长段循环总结下来就是：测试target网站还是否存活

接下来我们将来到整个main中最最最最最重要的一段代码：

		waf = attacker.identwaf(options.findall)log.info('Identified WAF: %s' % waf)

这段也是大部分现在网上那些wafw00f什么分析的重点部分，当然我肯定不会像网上那样讲的了，那么跟着我接着看看attacker要干什么吧

核心是WAFW00F类重点identwaf方法

WAFW00F.identwaf()

前置有些内容我先提一下，再来分析这个函数：
首先是WAFW00F的使用的攻击payload

	xsstring = '<script>alert("XSS");</script>'sqlistring = "UNION SELECT ALL FROM information_schema AND ' or SLEEP(5) or '"lfistring = '../../../../etc/passwd'rcestring = '/bin/cat /etc/passwd; ping 127.0.0.1; curl google.com'xxestring = '<!ENTITY xxe SYSTEM "file:///etc/shadow">]><pwn>&hack;</pwn>'

其次是WAFW00F的攻击手段

    def nonExistent(self):return self.Request(path=self.path + str(random.randrange(100, 999)) + '.html')def xssAttack(self):return self.Request(path=self.path, params= {'s': self.xsstring})def xxeAttack(self):return self.Request(path=self.path, params= {'s': self.xxestring})def lfiAttack(self):return self.Request(path=self.path + self.lfistring)def centralAttack(self):return self.Request(path=self.path, params={'a': self.xsstring, 'b': self.sqlistring, 'c': self.lfistring})def sqliAttack(self):return self.Request(path=self.path, params= {'s': self.sqlistring})def oscAttack(self):return self.Request(path=self.path, params= {'s': self.rcestring})

接下来开始详细讲解identwaf是怎么实现的

    def identwaf(self, findall=False):detected = list()try:self.attackres = self.performCheck(self.centralAttack)except RequestBlocked:return detectedfor wafvendor in self.checklist:self.log.info('Checking for %s' % wafvendor)if self.wafdetections[wafvendor](self):detected.append(wafvendor)if not findall:breakself.knowledge['wafname'] = detectedreturn detected

首先identwaf初始化了一个detected为空列表，用于存储该网站探查到的WAF保护情况
尝试寻找所有的WAF(如果findall为True)

    def performCheck(self, request_method):r = request_method()if r is None:raise RequestBlocked()return r

首先尝试centralAttack

    def centralAttack(self):return self.Request(path=self.path, params={'a': self.xsstring, 'b': self.sqlistring, 'c': self.lfistring})

如果有返回值，return这个返回值，如果没有，报错

不报错情况

self.attackres就等于这个返回值

一些必要参数

我们接着关注一下另外一些场外因素（类内全局变量）

    wafdetections = dict()plugin_dict = load_plugins()result_dict = {}for plugin_module in plugin_dict.values():wafdetections[plugin_module.NAME] = plugin_module.is_waf# Check for prioritized ones first, then check those added externallychecklist = wafdetectionspriochecklist += list(set(wafdetections.keys()) - set(checklist))

load_plugins()

	def load_plugins():here = os.path.abspath(os.path.dirname(__file__))get_path = partial(os.path.join, here)plugin_dir = get_path('plugins')plugin_base = PluginBase(package='wafw00f.plugins', searchpath=[plugin_dir])plugin_source = plugin_base.make_plugin_source(searchpath=[plugin_dir], persist=True)plugin_dict = {}for plugin_name in plugin_source.list_plugins():plugin_dict[plugin_name] = plugin_source.load_plugin(plugin_name)return plugin_dict

here相当于wafw00f库的绝对路径
get_path 实际上是 os.path.join(here, *args)，即here必是os.path.join的一个参数，至于*args则是后续新添加的内容（可以学习这里wafw00f的partial的应用）
下面plugin_dir 就是指插件的地址
这段代码的主要目的是动态加载指定目录（这里是 ‘plugins’ 目录）下的插件，并将这些插件存储在一个字典中返回。它使用了 pluginbase 库来实现插件的动态加载。下面是对代码各部分的详细解释：

1. 导入需要的包：pluginbase.PluginBase、os、functiontools.partial
2. 确定插件目录： ○ here = os.path.abspath(os.path.dirname(file))：获取当前脚本的绝对路径。 ○ get_path =
   partial(os.path.join, here)：使用 functools.partial 创建一个新的函数
   get_path，这个函数将 here 作为第一个参数传递给 os.path.join，允许你轻松地添加相对于当前脚本的路径。 ○
   plugin_dir = get_path(‘plugins’)：使用 get_path 函数获取 ‘plugins’ 目录的绝对路径。
3. 创建插件基础： ○ plugin_base = PluginBase(package=‘wafw00f.plugins’, searchpath=[plugin_dir])：创建一个 PluginBase 实例。package
   参数指定了插件包的名称（这里可能是用于插件导入的命名空间），searchpath 指定了插件的搜索路径（即前面获取的
   plugin_dir）。
4. 创建插件源： ○ plugin_source = plugin_base.make_plugin_source(searchpath=[plugin_dir],
   persist=True)：通过 plugin_base 实例创建一个插件源。searchpath 同样指定了插件的搜索路径，persist
   参数设置为 True 表示插件源将尝试持久化已加载的插件信息，以优化后续加载。
5. 加载插件： ○ 初始化一个空字典 plugin_dict 用于存储加载的插件。 ○ 使用 for 循环遍历 plugin_source.list_plugins() 返回的插件名称列表。 ○ 对于每个插件名称，使用
   plugin_source.load_plugin(plugin_name) 加载插件，并将其存储在 plugin_dict
   中，键为插件名称，值为插件对象。
6. 返回插件字典：最后，函数返回包含所有加载插件的字典。

总结来说，这段代码通过 pluginbase 库动态加载了一个指定目录（‘plugins’）下的所有插件，并将它们以名称到对象的映射形式存储在一个字典中返回。这种机制允许应用程序在不重启的情况下动态扩展功能，只需添加新的插件到 ‘plugins’ 目录即可。

wafdetections

for plugin_module in plugin_dict.values():wafdetections[plugin_module.NAME] = plugin_module.is_waf

因为我们返回的plugin_dict是通过pluginbase和PluginBase.make_plugin_source来生成的，里面key值为每个plugin的文件名，而value是一共module类，module.NAME是每个plugin对WAF的命名，module.is_waf指的就是每个waf插件的识别函数，所以这里module相当于一个plugin文件：

NAME = 'Armor Defense (Armor)'def is_waf(self):schemes = [self.matchContent(r'blocked by website protection from armor'),self.matchContent(r'please create an armor support ticket')]if any(i for i in schemes):return Truereturn False

wafdetectionsprio

就是一个列表，里面包含了各个waf的命名
checklist
checklist很简单，就是把所有需要检查的waf整成列表，因为plugin是可扩展的，所以这里有可扩展兼容
checklist += list(set(wafdetections.keys()) - set(checklist))

后续检测

for wafvendor in self.checklist:self.log.info('Checking for %s' % wafvendor)if self.wafdetections[wafvendor](self):detected.append(wafvendor)if not findall:break

checklist前面已说，就是waf检测列表（有插件的waf才能被检测）
wafdetections也已说，是waf检测插件集合，举例

def is_waf(self):schemes = [self.matchContent(r'blocked by website protection from armor'),self.matchContent(r'please create an armor support ticket')]if any(i for i in schemes):return Truereturn False

所以其实就是调用了WAFW00F自身的matchContent等match方法来检测。

matchContent

def matchContent(self, regex, attack=True):if attack:r = self.attackreselse:r = self.rqif r is None:return# We may need to match multiline context in response bodyif re.search(regex, r.text, re.I):return Truereturn False

matchHeader

def matchHeader(self, headermatch, attack=False):if attack:r = self.attackreselse:r = self.rqif r is None:returnheader, match = headermatchheaderval = r.headers.get(header)if headerval:# set-cookie can have multiple headers, python gives it to us# concatinated with a commaif header == 'Set-Cookie':headervals = headerval.split(', ')else:headervals = [headerval]for headerval in headervals:if re.search(match, headerval, re.I):return Truereturn False

显然，wafw00f在检测上面更加灵活，对于有些waf它可能现在变成了5s盾那种类型，identYwaf直接向网站url发包检测盲猜很容易被5s盾拦截，但是identYwaf却不会处理5s盾（因为5s盾返回的不是HTML而是js等其它的包），而wafw00f则通过matchHeaders方法巧妙的避开了identYwaf僵硬匹配HTML的弊端！！！

identwaf函数总结

1. 有两种模式，一般默认是指匹配一个waf，可以通过设置findall来选择是否尝试匹配全部的waf
2. 这里self.attackres不清楚是做什么用的，总之它会测试centralAttack，如果centralAttack测试失败了，就会抛出一个错误，成功了则返回get到的值
3. 基于centralAttack测试成功的情况，对每个waf进行测试，如果findall是False，那么找到一个就退出，否则全部找一遍，用detected暂存所有找到的waf，找完后再存到类实例的knowledge中

回到主流程中，后面我就不再分析了，剩下都是wafw00f的一些输出。

总结

首先wafw00f中心攻击识别效果奇好无比，而且很神奇可以处理5s盾这种情况，因为它为每种waf设置了一种检测插件，检测插件是个性化的，对应waf的插件可以灵活处理不同waf的差异，使得识别效果远远好于IdentYwaf

例如cloudflare：

#!/usr/bin/env python
'''
Copyright (C) 2022, WAFW00F Developers.
See the LICENSE file for copying permission.
'''NAME = 'Cloudflare (Cloudflare Inc.)'def is_waf(self):schemes = [self.matchHeader(('server', 'cloudflare')),self.matchHeader(('server', r'cloudflare[-_]nginx')),self.matchHeader(('cf-ray', r'.+?')),self.matchCookie('__cfduid')]if any(i for i in schemes):return Truereturn False

基本所有的cloudflare都是5s盾了现在（世界出名），IdentYwaf还是基于http请求的正则匹配来实现cloudflare识别，显然是不可行的。而wafw00f专门匹配cloudflare的cookie（cloudflare会设置指定的cookie名__cfduid），专门匹配返回包的headers等。

其次是wafw00f使用到了request来实现发包抓包，这显然比使用urllib3库的IdentYwaf要强上不少，至少可以处理重定向这种情况，且wafw00f如果想要实现cookie维护的话也可以使用request的session类来实现。总之到了今天，使用对urllib3封装的request显然比直接使用urllib3要好得多方便得多。

其实我在语雀上的笔记还做了很多内容，一篇文章好像塞不下这么多内容了，所以我就不管了，反正主体该说的都说了，剩下的大家自己理一理也差不多了。