buuctf

日记2和3需要密码,日记1内容如下:
**3月1日 阴**
你昨天晚上又没会我的消息,在我孜孜不倦的骚扰下,你终于舍得回我了,你说“滚”,这其中一定有什么含义,我想了很久,滚是三点水,这代表你对我的思念也如滚滚流水一样汹涌,我感动哭了,不知道你现在在干嘛,我很想你
**3月19日** 小雨
突然发现你从来不说想我,wx聊天记录搜索了一下“想你”两个字,显示的是:“你在想你妈呢”你还会担心我想不想我母亲,你果然比我想象中贴心。
**4月21日** 大雨
今天降温了 风吹的我很舒服 我站在树下点了一根烟 我不想再做电焊工了 我把自己的心关起来锁在了一个很深的地方 我是一个不称职的电焊工 我电不到你 也焊不牢你的心
**6月6日** 暴雨
她今天修改了微信号,我也想跟着潮流的步伐,实在想不出要修改什么,于是我就把微信号修改成她之前的微信号,就在刚刚有个人加了我的微信,来了句熟人介绍
我哭了,我还能说什么呢,只能自拍一张留下此刻自闭的表情,以此告诫自己别再当舔狗了


010打开发现存在CRC错误,修改高度得到日记2的密码:


日记2有一个md文件一个test文件一个wav文件,md文件内容如下:
**6月10日** 多云
冷静下来以后,我决定换一份程序员的工作,偶然在网上看到一份东南亚的招聘广告,说不限专业不限年龄月薪28k,包出国机票,到国外后包吃包住,我顿时感到程序员是一个有前途的职业,打算好好准备去试一试
**7月10日** 晴
买了一本《一个月速成C++》,经过一个月的努力学习,我终于具备的面试资格,明天就开始面试了,心情还是有点小激动小紧张。。。。
**7月15日** 晴
虽然前几天的面试过程不尽人意,但我最后还是收到了录用offer,奈斯!
**8月1日** 多云
我终于来到了东南亚,然而这才是我黑暗生活的开始,我万万没想到,这居然是个骗局,什么28k,到了以后才发现各种奇奇怪怪的扣费搞得只剩下8k。。
俺的护照也被收走了,以防我逃走,每天至少工作12个小时,新员工被要求加班至14个小时。新员工第一个月没有假期,老员工一个月休息一到两天,如果当月没完成任务量,下个月的休息就会被取消。
公司对员工的管理和防范都很严密:办公室内,员工的私人手机一律上交,下班后才能领回,每名员工头顶都有摄像头,管理人员不时在办公室内巡视,突击检查员工的工作手机和电脑。大楼内的走廊、拐角、楼梯口到处有保安巡逻,随时可能对员工进行盘查,楼内除厕所以外,遍布无死角的摄像头。同时,为了防止被监控,员工所有的私人手机一旦连接办公室WiFi,直接开除,同样意味着一笔离职赔款
今天还有个跟我一样被骗来的小伙强烈抵抗,结果被公司保安暴打一顿,我用电脑麦克风录了一段音。。。
这样下去不行啊,我得想个办法逃走,先学习一波如何信息隐藏吧,想办法和外界取得沟通,emmmm随手写了个test,但感觉这种方法太容易引起注意了,要是被逮住又是一顿暴打咯呜呜呜
test文件内容:

明显是brainfuck,但是解密得到乱码失败。猜测解压后应该得到字符串,但是字符串brainfuck加密后应该是++++++++[开头的,与密文不符,尝试在开头加上++++++++后解密成功,得到:
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base64解密得到:

elf文件,写个脚本把解密后的数据保存为可执行文件:
import base64
data = 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f = open(r'C:\Users\hp430\Desktop\test1', 'wb')
f.write(data)
f.close() 执行看下:
root@ubuntu:/home/test# chmod 777 test1
root@ubuntu:/home/test# ./test1
hei~what you want??
want a flag?
sorry~there is no flag
but maybe your can find something useful!
root@ubuntu:/home/test#
没思路了,于是去看wav文件,silenteye得到日记3密码:

日记3给了一堆源码以及一个md文件,md文件内容为:
**8月8日** 阴
经过一个多星期的深思熟虑,我发现我们工作中完成的源代码是会经过公司专员审核然后发给其他客户的,应该是属于代码外包业务,而我们的甲方大多是正规的大公司
因此通过源代码向外界发送求救信号是一个不错的方法
但需要满足以下几个条件:
1. 加入代码隐写的部分不能影响源代码的编译
2. 不能很容易被公司审计专员看出来
3. 不能直接明文交流
这可真让人头秃啊。。。。
**8月16日** 多云
又过了一个多星期,👴终于想出了办法!!!!
测试几次后,确定没有引起公司审计专员的注意,这种方法应该是没问题的,接下来就是等待了,但愿有人能发现我留在源代码的求救信息吧.........
md写了不能明文交流,联想到tab和空格,但是几千个文件,挨个查看不现实,因此考虑写个脚本搜索,由于tab和空格编写的隐藏数据通常是连续的,同时要过滤到常见的双空格和双/t,因此考虑用 \t \t作为搜索字符:
import os
def get_file_list(dir_path):
_file_list = os.listdir(dir_path)
file_list = []
for file_str in _file_list:
new_dir_path = dir_path+'\\'+file_str
if os.path.isdir(new_dir_path):
file_list.extend(get_file_list(new_dir_path))
else:
file_list.append(new_dir_path)
return file_list
file_list = get_file_list(r'C:\Users\hp430\Desktop\日记3\source_code')
for file_str in file_list:
f = open(file_str, 'r', encoding='utf-8')
try:
data = f.read()
if ' \t \t' in data:
print(file_str)
except:
pass
C:\Users\hp430\Desktop\日记3\source_code\elf\rtld.c
C:\Users\hp430\Desktop\日记3\source_code\malloc\arena.c
C:\Users\hp430\Desktop\日记3\source_code\malloc\malloc.c 查看源文件,发现隐藏的方式如下:

均在}后面,提取后转二进制得到flag:
f_list = r'''C:\Users\hp430\Desktop\日记3\source_code\elf\rtld.c
C:\Users\hp430\Desktop\日记3\source_code\malloc\arena.c
C:\Users\hp430\Desktop\日记3\source_code\malloc\malloc.c'''
f_list = f_list.split('\n')
result = ''
for f in f_list:
for data in open(f, 'r').readlines():
data = data[:-1]
if '}' in data:
data = data.split('}')[-1]
if '\t' in data:
data1 = data[::].replace('\t', '')
data1 = data1.replace(' ', '')
if not data1:
print([data])
result += data
result = result.replace('\t', '1')
result = result.replace(' ', '0')
print(result)

flag{code_steganography_1s_funny!}