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#!/usr/bin/env python
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"""
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Copyright (c) 2006-2024 sqlmap developers (https://sqlmap.org/)
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See the file 'LICENSE' for copying permission
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"""
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import re
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# 从sqlmap的库中导入随机范围函数、兼容模块中的xrange函数、知识库和优先级枚举
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from lib.core.common import randomRange
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from lib.core.compat import xrange
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from lib.core.data import kb
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from lib.core.enums import PRIORITY
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__priority__ = PRIORITY.NORMAL
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def dependencies():
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pass
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def tamper(payload, **kwargs):
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"""
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Replaces each keyword character with random case value (e.g. SELECT -> SEleCt)
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Tested against:
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* Microsoft SQL Server 2005
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* MySQL 4, 5.0 and 5.5
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* Oracle 10g
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* PostgreSQL 8.3, 8.4, 9.0
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* SQLite 3
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Notes:
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* Useful to bypass very weak and bespoke web application firewalls
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that has poorly written permissive regular expressions
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* This tamper script should work against all (?) databases
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>>> import random
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>>> random.seed(0)
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>>> tamper('INSERT')
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'InSeRt'
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>>> tamper('f()')
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'f()'
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>>> tamper('function()')
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'FuNcTiOn()'
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>>> tamper('SELECT id FROM `user`')
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'SeLeCt id FrOm `user`'
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"""
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retVal = payload
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if payload:
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# 使用正则表达式找到payload中的所有关键字（至少两个字母或下划线的单词）
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for match in re.finditer(r"\b[A-Za-z_]{2,}\b", retVal):
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word = match.group()
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# 如果单词是SQL关键字，并且不是被引号或括号包围的，或者是一个函数名
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if (word.upper() in kb.keywords and re.search(r"(?i)[`\"'\[]%s[`\"'\]]" % word, retVal) is None) or ("%s(" % word) in payload:
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# 生成一个随机大小写混合的单词
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while True:
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_ = ""
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for i in xrange(len(word)):
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# 随机选择大写或小写
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_ += word[i].upper() if randomRange(0, 1) else word[i].lower()
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# 确保生成的单词不是全大写或全小写，并退出循环
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if len(_) > 1 and _ not in (_.lower(), _.upper()):
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break
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# 将原始的单词替换为随机大小写混合的单词
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retVal = retVal.replace(word, _)
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return retVal
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