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openEuler-competition / Summer2021-No.136 识别软件包里的Shell脚本与其调用的系统命令和服务

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MulanPSL-2.0

Summer2021-No.136 识别软件包里的Shell脚本与其调用的系统命令和服务

介绍

RPM软件包中会存在一些Shell脚本,他们会调用一些系统命令和服务,通常情况下,是需要我们实际执行这些脚本才能知道他们执行了哪些操作,调用了什么系统命令或服务,这个项目通过对脚本文本进行分析,用一种不执行的方式识别出脚本进行的操作,从而可以提前对软件兼容性进行分析。

软件架构

fileIdentify.py

输入rpm包的地址,将其中的shell脚本识别出来,并且对其进行预处理,以便下一步的识别。

init.py

init.py是该脚本处理工具的主体。主要是通过PLY对shell文本进行分词后再筛选出所调用的命令。该程序的基本工作流程是,先将shell脚本用PLY的lex模块变成一系列token序列,之后依次提取可能执行的命令(包含在循环块中的命令,包含在条件块中的命令),提取shell脚本中的函数生成函数表,对主程序中调用的命令和函数进行提取,分析出哪些脚本会被调用,并且可以对多个脚本进行对比。

generatePdf.py

利用reportlab库生成识别和对比报告。

test.py

用于在命令行下调用程序。

main.py

使用kivy库为程序提供简单的GUI。

unpackRPM.py

用于解压RPM包。

commands.json

包含了所有要识别的命令。

安装说明

运行此项目需要python3.9的环境。

  • 获取项目文件

    git clone https://gitee.com/openeuler-competition/summer2021-136
  • 安装PLY库,用于语法分析

    pip install ply
  • 安装reportlab库,用来生成pdf

    pip install reportlab
  • 安装kivy库,用以支持GUI

    python -m pip install docutils pygments pypiwin32 kivy.deps.sdl2 kivy.deps.glew
    python -m pip install kivy.deps.gstreamer
    python -m pip install kivy

使用说明

若采用命令行的方式运行

  • 可以用unpackRPM.py来解压RPM包

    python unpackRPM.py
  • 在命令行下运行以下命令

    python test.py
  • 按照提示输入RPM包的地址

  • 若要识别示例文件输入以下内容

    2
    testfile/rpmtest1
    testfile/rpmtest2
  • 生成的pdf保存在当前目录下,Script_contrast.pdf保存了脚本对比信息,Script_identification.pdf保存脚本识别信息。

采用图形界面方式运行

  • 可以用unpackRPM.py来解压RPM包

    python unpackRPM.py
  • 在命令行下运行以下命令

    python main.py
  • 在文本框下输入RPM包地址

  • 若要识别示例文件输入以下内容

    testfile/rpmtest1
    testfile/rpmtest2
  • 生成的pdf保存在当前目录下,Script_contrast.pdf保存了脚本对比信息,Script_identification.pdf保存脚本识别信息。

帮助

  • PLY文档 这个命令分析器最初的设想是用PLY将所有的python语法识别,进而可以准确的得知哪些命令被运行。但是由于时间原因,没能完成所有的语法解析,对于处于条件块中的语句,不能根据不同的情况,判断出是否会执行,但是对于这些命令,会给出可能会执行的标记。之后完成对shell语法的解析后会对这一块进行优化。
  • Bash Bash的源码中含有最初的yacc文件,可以参考其完成对shell的解析。
木兰宽松许可证, 第2版 木兰宽松许可证, 第2版 2020年1月 http://license.coscl.org.cn/MulanPSL2 您对“软件”的复制、使用、修改及分发受木兰宽松许可证,第2版(“本许可证”)的如下条款的约束: 0. 定义 “软件”是指由“贡献”构成的许可在“本许可证”下的程序和相关文档的集合。 “贡献”是指由任一“贡献者”许可在“本许可证”下的受版权法保护的作品。 “贡献者”是指将受版权法保护的作品许可在“本许可证”下的自然人或“法人实体”。 “法人实体”是指提交贡献的机构及其“关联实体”。 “关联实体”是指,对“本许可证”下的行为方而言,控制、受控制或与其共同受控制的机构,此处的控制是指有受控方或共同受控方至少50%直接或间接的投票权、资金或其他有价证券。 1. 授予版权许可 每个“贡献者”根据“本许可证”授予您永久性的、全球性的、免费的、非独占的、不可撤销的版权许可,您可以复制、使用、修改、分发其“贡献”,不论修改与否。 2. 授予专利许可 每个“贡献者”根据“本许可证”授予您永久性的、全球性的、免费的、非独占的、不可撤销的(根据本条规定撤销除外)专利许可,供您制造、委托制造、使用、许诺销售、销售、进口其“贡献”或以其他方式转移其“贡献”。前述专利许可仅限于“贡献者”现在或将来拥有或控制的其“贡献”本身或其“贡献”与许可“贡献”时的“软件”结合而将必然会侵犯的专利权利要求,不包括对“贡献”的修改或包含“贡献”的其他结合。如果您或您的“关联实体”直接或间接地,就“软件”或其中的“贡献”对任何人发起专利侵权诉讼(包括反诉或交叉诉讼)或其他专利维权行动,指控其侵犯专利权,则“本许可证”授予您对“软件”的专利许可自您提起诉讼或发起维权行动之日终止。 3. 无商标许可 “本许可证”不提供对“贡献者”的商品名称、商标、服务标志或产品名称的商标许可,但您为满足第4条规定的声明义务而必须使用除外。 4. 分发限制 您可以在任何媒介中将“软件”以源程序形式或可执行形式重新分发,不论修改与否,但您必须向接收者提供“本许可证”的副本,并保留“软件”中的版权、商标、专利及免责声明。 5. 免责声明与责任限制 “软件”及其中的“贡献”在提供时不带任何明示或默示的担保。在任何情况下,“贡献者”或版权所有者不对任何人因使用“软件”或其中的“贡献”而引发的任何直接或间接损失承担责任,不论因何种原因导致或者基于何种法律理论,即使其曾被建议有此种损失的可能性。 6. 语言 “本许可证”以中英文双语表述,中英文版本具有同等法律效力。如果中英文版本存在任何冲突不一致,以中文版为准。 条款结束 如何将木兰宽松许可证,第2版,应用到您的软件 如果您希望将木兰宽松许可证,第2版,应用到您的新软件,为了方便接收者查阅,建议您完成如下三步: 1, 请您补充如下声明中的空白,包括软件名、软件的首次发表年份以及您作为版权人的名字; 2, 请您在软件包的一级目录下创建以“LICENSE”为名的文件,将整个许可证文本放入该文件中; 3, 请将如下声明文本放入每个源文件的头部注释中。 Copyright (c) [Year] [name of copyright holder] [Software Name] is licensed under Mulan PSL v2. 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