76 lines
3.8 KiB
Python
76 lines
3.8 KiB
Python
import re
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from arjun.core.utils import lcs, diff_map, remove_tags
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def define(response_1, response_2, param, value, wordlist):
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"""
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defines a rule list for detecting anomalies by comparing two HTTP response
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returns dict
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"""
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factors = {
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'same_code': False, # if http status code is same, contains that code
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'same_body': False, # if http body is same, contains that body
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'same_plaintext': False, # if http body isn't same but is same after removing html, contains that non-html text
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'lines_diff': False, # if http-body or plaintext aren't and there are more than two lines, contain which lines are same
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'common_string': False, # if there is just one line, contains the longest common string
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'same_headers': False, # if the headers are same, contains those headers
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'same_redirect': False, # if both requests redirect in similar manner, contains that redirection
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'param_missing': False, # if param name is missing from the body, contains words that are already there
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'value_missing': False # contains whether param value is missing from the body
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}
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if response_1 and response_2:
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body_1, body_2 = response_1.text, response_2.text
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if response_1.status_code == response_2.status_code:
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factors['same_code'] = response_1.status_code
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if response_1.headers.keys() == response_2.headers.keys():
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factors['same_headers'] = list(response_1.headers.keys())
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if response_1.url == response_2.url:
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factors['same_redirect'] = response_1.url
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if response_1.text == response_2.text:
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factors['same_body'] = response_1.text
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elif remove_tags(body_1) == remove_tags(body_2):
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factors['same_plaintext'] = remove_tags(body_1)
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elif body_1 and body_2:
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if body_1.count('\\n') == 1:
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factors['common_string'] = lcs(body_1, body_2)
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elif body_1.count('\\n') == body_2.count('\\n'):
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factors['lines_diff'] = diff_map(body_1, body_2)
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if param not in response_2.text:
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factors['param_missing'] = [word for word in wordlist if word in response_2.text]
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if value not in response_2.text:
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factors['value_missing'] = True
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return factors
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def compare(response, factors, params):
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"""
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detects anomalies by comparing a HTTP response against a rule list
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returns string, list (anamoly, list of parameters that caused it)
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"""
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if factors['same_code'] and response.status_code != factors['same_code']:
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return ('http code', params)
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if factors['same_headers'] and list(response.headers.keys()) != factors['same_headers']:
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return ('http headers', params)
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if factors['same_redirect'] and response.url != factors['same_redirect']:
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return ('redirection', params)
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if factors['same_body'] and response.text != factors['same_body']:
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return ('body length', params)
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if factors['same_plaintext'] and remove_tags(response.text) != factors['same_plaintext']:
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return ('text length', params)
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if factors['lines_diff']:
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for line in factors['lines_diff']:
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if line not in response.text:
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return ('lines', params)
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if factors['common_string'] and factors['common_string'] not in response.text:
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return ('constant string', params)
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if type(factors['param_missing']) == list:
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for param in params.keys():
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if param in response.text and param not in factors['param_missing'] and re.search(r'[\'"\s]%s[\'"\s]' % param, response.text):
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return ('param name reflection', params)
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if factors['value_missing']:
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for value in params.values():
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if value in response.text and re.search(r'[\'"\s]%s[\'"\s]' % value, response.text):
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return ('param value reflection', params)
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return ('', [])
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