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from __future__ import absolute_import
import ast
import re
import operator as op
import pyparsing
from ..exceptions import CloudflareSolveError
from . import JavaScriptInterpreter
# ------------------------------------------------------------------------------- #
_OP_MAP = {
ast.Add: op.add,
ast.Sub: op.sub,
ast.Mult: op.mul,
ast.Div: op.truediv,
ast.Invert: op.neg,
}
# ------------------------------------------------------------------------------- #
class Calc(ast.NodeVisitor):
def visit_BinOp(self, node):
return _OP_MAP[type(node.op)](self.visit(node.left), self.visit(node.right))
# ------------------------------------------------------------------------------- #
def visit_Num(self, node):
return node.n
# ------------------------------------------------------------------------------- #
def visit_Expr(self, node):
return self.visit(node.value)
# ------------------------------------------------------------------------------- #
@classmethod
def doMath(cls, expression):
tree = ast.parse(expression)
calc = cls()
return calc.visit(tree.body[0])
# ------------------------------------------------------------------------------- #
class Parentheses(object):
def fix(self, s):
res = []
self.visited = set([s])
self.dfs(s, self.invalid(s), res)
return res
# ------------------------------------------------------------------------------- #
def dfs(self, s, n, res):
if n == 0:
res.append(s)
return
for i in range(len(s)):
if s[i] in ['(', ')']:
s_new = s[:i] + s[i + 1:]
if s_new not in self.visited and self.invalid(s_new) < n:
self.visited.add(s_new)
self.dfs(s_new, self.invalid(s_new), res)
# ------------------------------------------------------------------------------- #
def invalid(self, s):
plus = minus = 0
memo = {"(": 1, ")": -1}
for c in s:
plus += memo.get(c, 0)
minus += 1 if plus < 0 else 0
plus = max(0, plus)
return plus + minus
# ------------------------------------------------------------------------------- #
class ChallengeInterpreter(JavaScriptInterpreter):
def __init__(self):
super(ChallengeInterpreter, self).__init__('native')
# ------------------------------------------------------------------------------- #
def eval(self, body, domain):
operators = {
'+': op.add,
'-': op.sub,
'*': op.mul,
'/': op.truediv
}
# ------------------------------------------------------------------------------- #
def flatten(lists):
return sum(map(flatten, lists), []) if isinstance(lists, list) else [lists]
# ------------------------------------------------------------------------------- #
def jsfuckToNumber(jsFuck):
# "Clean Up" JSFuck
jsFuck = jsFuck.replace('!+[]', '1').replace('!![]', '1').replace('[]', '0')
jsFuck = jsFuck.lstrip('+').replace('(+', '(').replace(' ', '')
jsFuck = Parentheses().fix(jsFuck)[0]
# Hackery Parser for Math
stack = []
bstack = []
for i in flatten(pyparsing.nestedExpr().parseString(jsFuck).asList()):
if i == '+':
stack.append(bstack)
bstack = []
continue
bstack.append(i)
stack.append(bstack)
return int(''.join([str(Calc.doMath(''.join(i))) for i in stack]))
# ------------------------------------------------------------------------------- #
def divisorMath(payload, needle, domain):
jsfuckMath = payload.split('/')
if needle in jsfuckMath[1]:
expression = re.findall(r"^(.*?)(.)\(function", jsfuckMath[1])[0]
expression_value = operators[expression[1]](
float(jsfuckToNumber(expression[0])),
float(ord(domain[jsfuckToNumber(jsfuckMath[1][
jsfuckMath[1].find('"("+p+")")}') + len('"("+p+")")}'):-2
])]))
)
else:
expression_value = jsfuckToNumber(jsfuckMath[1])
expression_value = jsfuckToNumber(jsfuckMath[0]) / float(expression_value)
return expression_value
# ------------------------------------------------------------------------------- #
def challengeSolve(body, domain):
jschl_answer = 0
try:
jsfuckChallenge = re.search(
r"setTimeout\(function\(\){\s+var.*?f,\s*(?P<variable>\w+).*?:(?P<init>\S+)};"
r".*?\('challenge-form'\);.*?;(?P<challenge>.*?a\.value)\s*=\s*\S+\.toFixed\(10\);",
body,
re.DOTALL | re.MULTILINE
).groupdict()
except AttributeError:
raise CloudflareSolveError('There was an issue extracting "jsfuckChallenge" from the Cloudflare challenge.')
kJSFUCK = re.search(r'(;|)\s*k.=(?P<kJSFUCK>\S+);', jsfuckChallenge['challenge'], re.S | re.M)
if kJSFUCK:
try:
kJSFUCK = jsfuckToNumber(kJSFUCK.group('kJSFUCK'))
except IndexError:
raise CloudflareSolveError('There was an issue extracting "kJSFUCK" from the Cloudflare challenge.')
try:
kID = re.search(r"\s*k\s*=\s*'(?P<kID>\S+)';", body).group('kID')
except IndexError:
raise CloudflareSolveError('There was an issue extracting "kID" from the Cloudflare challenge.')
try:
r = re.compile(r'<div id="{}(?P<id>\d+)">\s*(?P<jsfuck>[^<>]*)</div>'.format(kID))
kValues = {}
for m in r.finditer(body):
kValues[int(m.group('id'))] = m.group('jsfuck')
jsfuckChallenge['k'] = kValues[kJSFUCK]
except (AttributeError, IndexError):
raise CloudflareSolveError('There was an issue extracting "kValues" from the Cloudflare challenge.')
jsfuckChallenge['challenge'] = re.finditer(
r'{}.*?([+\-*/])=(.*?);(?=a\.value|{})'.format(
jsfuckChallenge['variable'],
jsfuckChallenge['variable']
),
jsfuckChallenge['challenge']
)
# ------------------------------------------------------------------------------- #
if '/' in jsfuckChallenge['init']:
val = jsfuckChallenge['init'].split('/')
jschl_answer = jsfuckToNumber(val[0]) / float(jsfuckToNumber(val[1]))
else:
jschl_answer = jsfuckToNumber(jsfuckChallenge['init'])
# ------------------------------------------------------------------------------- #
for expressionMatch in jsfuckChallenge['challenge']:
oper, expression = expressionMatch.groups()
if '/' in expression:
expression_value = divisorMath(expression, 'function(p)', domain)
else:
if 'Element' in expression:
expression_value = divisorMath(jsfuckChallenge['k'], '"("+p+")")}', domain)
else:
expression_value = jsfuckToNumber(expression)
jschl_answer = operators[oper](jschl_answer, expression_value)
# ------------------------------------------------------------------------------- #
# if not jsfuckChallenge['k'] and '+ t.length' in body:
# jschl_answer += len(domain)
# ------------------------------------------------------------------------------- #
return '{0:.10f}'.format(jschl_answer)
# ------------------------------------------------------------------------------- #
return challengeSolve(body, domain)
# ------------------------------------------------------------------------------- #
ChallengeInterpreter()
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