Cloudflare瀏覽器驗證跳過及郵箱反混淆 ; 論野生技術&二次元

~~作死必備~~ 請摸着良心使用

瀏覽器驗證跳過

Cloudflare目前使用JS的一個奇技淫巧來作JS的瀏覽器上下文驗證，先來看個實例：

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    <input type="hidden" id="jschl-answer" name="jschl_answer"/>
</form>

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b = function(b, c) {a() ? document.addEventListener("DOMContentLoaded", b, c) : document.attachEvent("onreadystatechange", b)};

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t = t.firstChild.href;r = t.match(/https?:\/\//)[0];

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f = document.getElementById('challenge-form');

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f.action += location.hash;

f.submit();

}, 4000);

}, false);

})();

//]]>

</script>

</form>

2018年更新後，變量名變成了stop breaking

這是一個challange/response模式。關鍵部分就是那一堆[]和!了。F12一下可以得到一個等價替換表達式

! = true
[] = false
!![] = true

還有就是布爾值和布爾值相加會變成數字。我們使用正則表達式取出變量名，然後對於運算符（*=也可能是+=、-=)直接代入eval運算。當然如果你直接用Js2Py我也不攔你。目前金盾的CC防火牆還只能用Js2Py來擼233

而這幾句就是JS的瀏覽器上下文驗證啦

t = document.createElement('div');
t.innerHTML="<a href='/'>x</a>";
t = t.firstChild.href;r = t.match(/https?:\/\//)[0];
t = t.substr(r.length); t = t.substr(0,t.length-1);

t = document.createElement('div');

t.innerHTML="<a href='/'>x</a>";

t = t.firstChild.href;r = t.match(/https?:\/\//)[0];

t = t.substr(r.length); t = t.substr(0,t.length-1);

如果只有JS運行時而沒有瀏覽器上下文，document就是undefined，這幾句就坑爹了。實際上它只是將hostname取了出來，運行結果和location.hostname是等價的，這裡就不解釋了。

看完整代碼：

import re
def get_cv(ct, host_name):
    #ct = ct.replace('\n', '').replace('\r', '')
    #find all hidden form value
    hidden = re.findall('<input type="hidden" name="([^"]+)" value="([^\"]+)"', ct)
    hidden = '&'.join(map(lambda x:'='.join(x), hidden))
    url = re.findall('<form id="[^"]+" action="([^"]+)" method="get">', ct)[0]
    # get var name
    # var t,r,a,f, kMuTlpA={"t":+((!+[]+!![]+!![]+[])+(!+[]+!![]+!![]+!![]+!![]+!![]))};
    _, n, m, v = re.findall('var (:?[^,]+,)+ ([^=]+)={"([^"]+)":([^}]+)};', ct, re.DOTALL)[0]
    v = calc_symbol(v)
    for op, arg in re.findall('%s\.%s(.)=([^;]+);' % (n, m), ct):
        # preserve maxium precision possible
        v = eval('1.0 * (%.15f %s %.15f)' % (v, op, calc_symbol(arg)))
    # t = re.findall('\+\s*([^\.]+)\.length', ct, re.DOTALL)[0]
    # print '%s\.innerHTML\s*=\s*"([^"])";' % t
    # new_len = len(re.findall('%s\.innerHTML\s*=\s*"([^"]+)";' % t, ct, re.DOTALL)[0])
    # print new_len
    v = round(v, 10) + len(host_name)
    wait = re.findall('}, (\d+)\);', ct, re.DOTALL)[0]
    return hidden, v, url, wait

def calc_symbol(s):
    # +((symbols)+(symbols)+...)
    vmap = {'!':1, '[]':0, '!![]':1, '':0}
    # step 1: replace symbols into number
    # (!+[]) becomes "1"
    for sym in re.findall('\(([^\(\)]+)\)', s):
        s = s.replace("(" + sym + ")",
                str(sum(map(lambda x:vmap[x], sym.split('+')))))

    # step 2: concat the string
    # +(1+2+3+4+6) becomes "12346"
    for num in re.findall("\([\d\+]+\)", s):
        s = s.replace(num, re.sub('[\(\)\+]', '', num))

    # step 3: get the actual decimal value
    return eval("1.0*" + s)

import re

def get_cv(ct, host_name):

#ct = ct.replace('\n', '').replace('\r', '')

#find all hidden form value

hidden = re.findall('<input type="hidden" name="([^"]+)" value="([^\"]+)"', ct)

hidden = '&'.join(map(lambda x:'='.join(x), hidden))

url = re.findall('<form id="[^"]+" action="([^"]+)" method="get">', ct)[0]

# get var name

# var t,r,a,f, kMuTlpA={"t":+((!+[]+!![]+!![]+[])+(!+[]+!![]+!![]+!![]+!![]+!![]))};

_, n, m, v = re.findall('var (:?[^,]+,)+ ([^=]+)={"([^"]+)":([^}]+)};', ct, re.DOTALL)[0]

v = calc_symbol(v)

for op, arg in re.findall('%s\.%s(.)=([^;]+);' % (n, m), ct):

# preserve maxium precision possible

v = eval('1.0 * (%.15f %s %.15f)' % (v, op, calc_symbol(arg)))

# t = re.findall('\+\s*([^\.]+)\.length', ct, re.DOTALL)[0]

# print '%s\.innerHTML\s*=\s*"([^"])";' % t

# new_len = len(re.findall('%s\.innerHTML\s*=\s*"([^"]+)";' % t, ct, re.DOTALL)[0])

# print new_len

v = round(v, 10) + len(host_name)

wait = re.findall('}, (\d+)\);', ct, re.DOTALL)[0]

return hidden, v, url, wait

def calc_symbol(s):

# +((symbols)+(symbols)+...)

vmap = {'!':1, '[]':0, '!![]':1, '':0}

# step 1: replace symbols into number

# (!+[]) becomes "1"

for sym in re.findall('\(([^\(\)]+)\)', s):

s = s.replace("(" + sym + ")",

str(sum(map(lambda x:vmap[x], sym.split('+')))))

# step 2: concat the string

# +(1+2+3+4+6) becomes "12346"

for num in re.findall("\([\d\+]+\)", s):

s = s.replace(num, re.sub('[\(\)\+]', '', num))

# step 3: get the actual decimal value

return eval("1.0*" + s)

調用get_cv後得到的四個返回值依次是原始的challange值，計算的answer值，challange的提交地址，等待時間。

cfduid = re.findall('__cfduid=([^;]+);', resp['set-cookie'])[0]
c, v, u, w = get_cv(ct, 'example.com')
time.sleep(int(w)/1000)
resp, ct = requests.get('http://example.com%s?%s&jschl_answer=%s' % (u, c, v), headers = {'cookie':'__cfduid='+cfduid)
cf_clearance = re.findall('cf_clearance=([^;]+);', resp['set-cookie'])[0]

cfduid = re.findall('__cfduid=([^;]+);', resp['set-cookie'])[0]

c, v, u, w = get_cv(ct, 'example.com')

time.sleep(int(w)/1000)

resp, ct = requests.get('http://example.com%s?%s&jschl_answer=%s' % (u, c, v), headers = {'cookie':'__cfduid='+cfduid)

cf_clearance = re.findall('cf_clearance=([^;]+);', resp['set-cookie'])[0]

然後用這兩個cookie即可

郵箱反混淆

這個就比較簡單啦，純粹是js

這裡有一個郵箱地址-> [email protected] ，混淆之後大致會是這個樣子的：

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="314554424571455442451f525e5c">[email&nbsp;protected]</a><script cf-hash='f9e31' type="text/javascript">
/* <![CDATA[ */!function(){try{var t="currentScript"in document?document.currentScript:function(){for(var t=document.getElementsByTagName("script"),e=t.length;e--;)if(t[e].getAttribute("cf-hash"))return t[e]}();if(t&&t.previousSibling){var e,r,n,i,c=t.previousSibling,a=c.getAttribute("data-cfemail");if(a){for(e="",r=parseInt(a.substr(0,2),16),n=2;a.length-n;n+=2)i=parseInt(a.substr(n,2),16)^r,e+=String.fromCharCode(i);e=document.createTextNode(e),c.parentNode.replaceChild(e,c)}}}catch(u){}}();/* ]]> */</script>

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="314554424571455442451f525e5c">[email protected]</a><script cf-hash='f9e31' type="text/javascript">

/* <![CDATA[ */!function(){try{var t="currentScript"in document?document.currentScript:function(){for(var t=document.getElementsByTagName("script"),e=t.length;e--;)if(t[e].getAttribute("cf-hash"))return t[e]}();if(t&&t.previousSibling){var e,r,n,i,c=t.previousSibling,a=c.getAttribute("data-cfemail");if(a){for(e="",r=parseInt(a.substr(0,2),16),n=2;a.length-n;n+=2)i=parseInt(a.substr(n,2),16)^r,e+=String.fromCharCode(i);e=document.createTextNode(e),c.parentNode.replaceChild(e,c)}}}catch(u){}}();/* ]]> */</script>

主要就是這句for (e = “”, r = parseInt(a.substr(0, 2), 16), n = 2; a.length – n; n += 2) i = parseInt(a.substr(n, 2), 16)^r, e += String.fromCharCode(i);

聰明的你一定看出來了，實際上就是把一串字符串當成16進制和第一個字符異或再按照asc碼變回相應字符就行了。

def strip_email_protection(s):
    fp = re.findall('data-cfemail="([^"]+)">', s)
    if not fp:#no email obfuscation
        return s
    #parse email
    fp = fp[0]
    r = int(fp[:2], 16)
    email = ''.join([chr(int(fp[i:i+2], 16) ^ r) for i in range(2, len(fp), 2)])
    s = re.sub(r'<a ([^\s]+ )?class="__cf_email__".*?</a>', email, s)
    #strip <script>
    s = re.sub('<script.*?</script>', '', s, flags = re.DOTALL)
    return s

def strip_email_protection(s):

fp = re.findall('data-cfemail="([^"]+)">', s)

if not fp:#no email obfuscation

return s

#parse email

fp = fp[0]

r = int(fp[:2], 16)

email = ''.join([chr(int(fp[i:i+2], 16) ^ r) for i in range(2, len(fp), 2)])

s = re.sub(r'<a ([^\s]+ )?class="__cf_email__".*?</a>', email, s)

#strip <script>

s = re.sub('<script.*?</script>', '', s, flags = re.DOTALL)

return s